60 files changed, 8003 insertions, 1111 deletions

diff --git a/block/blk-core.c b/block/blk-core.c
index 2d053b584410..9e79a485e4f3 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1075,8 +1075,15 @@ void init_request_from_bio(struct request *req, struct bio *bio)
         /*
          * inherit FAILFAST from bio (for read-ahead, and explicit FAILFAST)
          */
-        if (bio_rw_ahead(bio) || bio_failfast(bio))
-                req->cmd_flags |= REQ_FAILFAST;
+        if (bio_rw_ahead(bio))
+                req->cmd_flags |= (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
+                                   REQ_FAILFAST_DRIVER);
+        if (bio_failfast_dev(bio))
+                req->cmd_flags |= REQ_FAILFAST_DEV;
+        if (bio_failfast_transport(bio))
+                req->cmd_flags |= REQ_FAILFAST_TRANSPORT;
+        if (bio_failfast_driver(bio))
+                req->cmd_flags |= REQ_FAILFAST_DRIVER;
 
         /*
          * REQ_BARRIER implies no merging, but lets make it explicit
diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.c b/drivers/infiniband/ulp/iser/iscsi_iser.c
index 5a1cf2580e16..1e5b6446231d 100644
--- a/drivers/infiniband/ulp/iser/iscsi_iser.c
+++ b/drivers/infiniband/ulp/iser/iscsi_iser.c
@@ -378,6 +378,7 @@ static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session)
 {
         struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
 
+        iscsi_session_teardown(cls_session);
         iscsi_host_remove(shost);
         iscsi_host_free(shost);
 }
@@ -597,7 +598,7 @@ static struct scsi_host_template iscsi_iser_sht = {
         .cmd_per_lun            = ISCSI_MAX_CMD_PER_LUN,
         .eh_abort_handler       = iscsi_eh_abort,
         .eh_device_reset_handler= iscsi_eh_device_reset,
-        .eh_host_reset_handler  = iscsi_eh_host_reset,
+        .eh_target_reset_handler= iscsi_eh_target_reset,
         .use_clustering         = DISABLE_CLUSTERING,
         .proc_name              = "iscsi_iser",
         .this_id                = -1,
diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index 103304c1e3b0..9bf3460c5540 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -849,7 +849,7 @@ static int multipath_map(struct dm_target *ti, struct bio *bio,
         dm_bio_record(&mpio->details, bio);
 
         map_context->ptr = mpio;
-        bio->bi_rw |= (1 << BIO_RW_FAILFAST);
+        bio->bi_rw |= (1 << BIO_RW_FAILFAST_TRANSPORT);
         r = map_io(m, bio, mpio, 0);
         if (r < 0 || r == DM_MAPIO_REQUEUE)
                 mempool_free(mpio, m->mpio_pool);
diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c
index 8744014b9d80..d4ac47d11279 100644
--- a/drivers/md/multipath.c
+++ b/drivers/md/multipath.c
@@ -167,7 +167,7 @@ static int multipath_make_request (struct request_queue *q, struct bio * bio)
         mp_bh->bio = *bio;
         mp_bh->bio.bi_sector += multipath->rdev->data_offset;
         mp_bh->bio.bi_bdev = multipath->rdev->bdev;
-        mp_bh->bio.bi_rw |= (1 << BIO_RW_FAILFAST);
+        mp_bh->bio.bi_rw |= (1 << BIO_RW_FAILFAST_TRANSPORT);
         mp_bh->bio.bi_end_io = multipath_end_request;
         mp_bh->bio.bi_private = mp_bh;
         generic_make_request(&mp_bh->bio);
@@ -393,7 +393,7 @@ static void multipathd (mddev_t *mddev)
                         *bio = *(mp_bh->master_bio);
                         bio->bi_sector += conf->multipaths[mp_bh->path].rdev->data_offset;
                         bio->bi_bdev = conf->multipaths[mp_bh->path].rdev->bdev;
-                        bio->bi_rw |= (1 << BIO_RW_FAILFAST);
+                        bio->bi_rw |= (1 << BIO_RW_FAILFAST_TRANSPORT);
                         bio->bi_end_io = multipath_end_request;
                         bio->bi_private = mp_bh;
                         generic_make_request(bio);
diff --git a/drivers/s390/block/dasd_diag.c b/drivers/s390/block/dasd_diag.c
index 85fcb4371054..7844461a995b 100644
--- a/drivers/s390/block/dasd_diag.c
+++ b/drivers/s390/block/dasd_diag.c
@@ -544,7 +544,7 @@ static struct dasd_ccw_req *dasd_diag_build_cp(struct dasd_device *memdev,
         }
         cqr->retries = DIAG_MAX_RETRIES;
         cqr->buildclk = get_clock();
-        if (req->cmd_flags & REQ_FAILFAST)
+        if (blk_noretry_request(req))
                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
         cqr->startdev = memdev;
         cqr->memdev = memdev;
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index 49f9d221e23d..2e60d5f968c8 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -1700,7 +1700,7 @@ static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
                         recid++;
                 }
         }
-        if (req->cmd_flags & REQ_FAILFAST)
+        if (blk_noretry_request(req))
                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
         cqr->startdev = startdev;
         cqr->memdev = startdev;
diff --git a/drivers/s390/block/dasd_fba.c b/drivers/s390/block/dasd_fba.c
index 93d9b6452a94..7d442aeff3d1 100644
--- a/drivers/s390/block/dasd_fba.c
+++ b/drivers/s390/block/dasd_fba.c
@@ -355,7 +355,7 @@ static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device * memdev,
                         recid++;
                 }
         }
-        if (req->cmd_flags & REQ_FAILFAST)
+        if (blk_noretry_request(req))
                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
         cqr->startdev = memdev;
         cqr->memdev = memdev;
diff --git a/drivers/scsi/constants.c b/drivers/scsi/constants.c
index 9785d7384199..4003deefb7d8 100644
--- a/drivers/scsi/constants.c
+++ b/drivers/scsi/constants.c
@@ -1364,7 +1364,8 @@ EXPORT_SYMBOL(scsi_print_sense);
 static const char * const hostbyte_table[]={
 "DID_OK", "DID_NO_CONNECT", "DID_BUS_BUSY", "DID_TIME_OUT", "DID_BAD_TARGET",
 "DID_ABORT", "DID_PARITY", "DID_ERROR", "DID_RESET", "DID_BAD_INTR",
-"DID_PASSTHROUGH", "DID_SOFT_ERROR", "DID_IMM_RETRY", "DID_REQUEUE"};
+"DID_PASSTHROUGH", "DID_SOFT_ERROR", "DID_IMM_RETRY", "DID_REQUEUE",
+"DID_TRANSPORT_DISRUPTED", "DID_TRANSPORT_FAILFAST" };
 #define NUM_HOSTBYTE_STRS ARRAY_SIZE(hostbyte_table)
 
 static const char * const driverbyte_table[]={
diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c b/drivers/scsi/device_handler/scsi_dh_alua.c
index 708e475896b9..e356b43753ff 100644
--- a/drivers/scsi/device_handler/scsi_dh_alua.c
+++ b/drivers/scsi/device_handler/scsi_dh_alua.c
@@ -109,7 +109,8 @@ static struct request *get_alua_req(struct scsi_device *sdev,
         }
 
         rq->cmd_type = REQ_TYPE_BLOCK_PC;
-        rq->cmd_flags |= REQ_FAILFAST | REQ_NOMERGE;
+        rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
+                         REQ_FAILFAST_DRIVER;
         rq->retries = ALUA_FAILOVER_RETRIES;
         rq->timeout = ALUA_FAILOVER_TIMEOUT;
 
diff --git a/drivers/scsi/device_handler/scsi_dh_emc.c b/drivers/scsi/device_handler/scsi_dh_emc.c
index 8f45570a8a01..0e572d2c5b0a 100644
--- a/drivers/scsi/device_handler/scsi_dh_emc.c
+++ b/drivers/scsi/device_handler/scsi_dh_emc.c
@@ -303,7 +303,8 @@ static struct request *get_req(struct scsi_device *sdev, int cmd,
 
         rq->cmd[4] = len;
         rq->cmd_type = REQ_TYPE_BLOCK_PC;
-        rq->cmd_flags |= REQ_FAILFAST;
+        rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
+                         REQ_FAILFAST_DRIVER;
         rq->timeout = CLARIION_TIMEOUT;
         rq->retries = CLARIION_RETRIES;
 
diff --git a/drivers/scsi/device_handler/scsi_dh_hp_sw.c b/drivers/scsi/device_handler/scsi_dh_hp_sw.c
index 5e93c88ad66b..9aec4ca64e56 100644
--- a/drivers/scsi/device_handler/scsi_dh_hp_sw.c
+++ b/drivers/scsi/device_handler/scsi_dh_hp_sw.c
@@ -112,7 +112,8 @@ static int hp_sw_tur(struct scsi_device *sdev, struct hp_sw_dh_data *h)
                 return SCSI_DH_RES_TEMP_UNAVAIL;
 
         req->cmd_type = REQ_TYPE_BLOCK_PC;
-        req->cmd_flags |= REQ_FAILFAST;
+        req->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
+                          REQ_FAILFAST_DRIVER;
         req->cmd_len = COMMAND_SIZE(TEST_UNIT_READY);
         req->cmd[0] = TEST_UNIT_READY;
         req->timeout = HP_SW_TIMEOUT;
@@ -204,7 +205,8 @@ static int hp_sw_start_stop(struct scsi_device *sdev, struct hp_sw_dh_data *h)
                 return SCSI_DH_RES_TEMP_UNAVAIL;
 
         req->cmd_type = REQ_TYPE_BLOCK_PC;
-        req->cmd_flags |= REQ_FAILFAST;
+        req->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
+                          REQ_FAILFAST_DRIVER;
         req->cmd_len = COMMAND_SIZE(START_STOP);
         req->cmd[0] = START_STOP;
         req->cmd[4] = 1;        /* Start spin cycle */
diff --git a/drivers/scsi/device_handler/scsi_dh_rdac.c b/drivers/scsi/device_handler/scsi_dh_rdac.c
index 50bf95f3b5c4..a43c3ed4df28 100644
--- a/drivers/scsi/device_handler/scsi_dh_rdac.c
+++ b/drivers/scsi/device_handler/scsi_dh_rdac.c
@@ -226,7 +226,8 @@ static struct request *get_rdac_req(struct scsi_device *sdev,
         }
 
         rq->cmd_type = REQ_TYPE_BLOCK_PC;
-        rq->cmd_flags |= REQ_FAILFAST | REQ_NOMERGE;
+        rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
+                         REQ_FAILFAST_DRIVER;
         rq->retries = RDAC_RETRIES;
         rq->timeout = RDAC_TIMEOUT;
 
diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
index 4e0b7c8eb32e..7650707a40de 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.c
+++ b/drivers/scsi/ibmvscsi/ibmvfc.c
@@ -2031,8 +2031,6 @@ static void ibmvfc_terminate_rport_io(struct fc_rport *rport)
                 spin_unlock_irqrestore(shost->host_lock, flags);
         } else
                 ibmvfc_issue_fc_host_lip(shost);
-
-        scsi_target_unblock(&rport->dev);
         LEAVE;
 }
 
diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index 2a2f0094570f..ed6c54cae7b1 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -523,22 +523,20 @@ iscsi_tcp_cleanup_task(struct iscsi_conn *conn, struct iscsi_task *task)
 }
 
 /**
- * iscsi_data_rsp - SCSI Data-In Response processing
+ * iscsi_data_in - SCSI Data-In Response processing
  * @conn: iscsi connection
  * @task: scsi command task
  **/
 static int
-iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_task *task)
+iscsi_data_in(struct iscsi_conn *conn, struct iscsi_task *task)
 {
         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
         struct iscsi_tcp_task *tcp_task = task->dd_data;
         struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr;
-        struct iscsi_session *session = conn->session;
-        struct scsi_cmnd *sc = task->sc;
         int datasn = be32_to_cpu(rhdr->datasn);
-        unsigned total_in_length = scsi_in(sc)->length;
+        unsigned total_in_length = scsi_in(task->sc)->length;
 
-        iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
+        iscsi_update_cmdsn(conn->session, (struct iscsi_nopin*)rhdr);
         if (tcp_conn->in.datalen == 0)
                 return 0;
 
@@ -558,23 +556,6 @@ iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_task *task)
                 return ISCSI_ERR_DATA_OFFSET;
         }
 
-        if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) {
-                sc->result = (DID_OK << 16) | rhdr->cmd_status;
-                conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
-                if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW |
-                                   ISCSI_FLAG_DATA_OVERFLOW)) {
-                        int res_count = be32_to_cpu(rhdr->residual_count);
-
-                        if (res_count > 0 &&
-                            (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
-                             res_count <= total_in_length))
-                                scsi_in(sc)->resid = res_count;
-                        else
-                                sc->result = (DID_BAD_TARGET << 16) |
-                                        rhdr->cmd_status;
-                }
-        }
-
         conn->datain_pdus_cnt++;
         return 0;
 }
@@ -774,7 +755,7 @@ iscsi_tcp_hdr_dissect(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
                 if (!task)
                         rc = ISCSI_ERR_BAD_ITT;
                 else
-                        rc = iscsi_data_rsp(conn, task);
+                        rc = iscsi_data_in(conn, task);
                 if (rc) {
                         spin_unlock(&conn->session->lock);
                         break;
@@ -998,7 +979,7 @@ iscsi_tcp_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
 
 error:
         debug_tcp("Error receiving PDU, errno=%d\n", rc);
-        iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
+        iscsi_conn_failure(conn, rc);
         return 0;
 }
 
@@ -1117,8 +1098,10 @@ iscsi_xmit(struct iscsi_conn *conn)
 
         while (1) {
                 rc = iscsi_tcp_xmit_segment(tcp_conn, segment);
-                if (rc < 0)
+                if (rc < 0) {
+                        rc = ISCSI_ERR_XMIT_FAILED;
                         goto error;
+                }
                 if (rc == 0)
                         break;
 
@@ -1127,7 +1110,7 @@ iscsi_xmit(struct iscsi_conn *conn)
                 if (segment->total_copied >= segment->total_size) {
                         if (segment->done != NULL) {
                                 rc = segment->done(tcp_conn, segment);
-                                if (rc < 0)
+                                if (rc != 0)
                                         goto error;
                         }
                 }
@@ -1142,8 +1125,8 @@ error:
         /* Transmit error. We could initiate error recovery
          * here. */
         debug_tcp("Error sending PDU, errno=%d\n", rc);
-        iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
-        return rc;
+        iscsi_conn_failure(conn, rc);
+        return -EIO;
 }
 
 /**
@@ -1904,6 +1887,7 @@ static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session)
         struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
 
         iscsi_r2tpool_free(cls_session->dd_data);
+        iscsi_session_teardown(cls_session);
 
         iscsi_host_remove(shost);
         iscsi_host_free(shost);
@@ -1927,7 +1911,7 @@ static struct scsi_host_template iscsi_sht = {
         .cmd_per_lun            = ISCSI_DEF_CMD_PER_LUN,
         .eh_abort_handler       = iscsi_eh_abort,
         .eh_device_reset_handler= iscsi_eh_device_reset,
-        .eh_host_reset_handler  = iscsi_eh_host_reset,
+        .eh_target_reset_handler= iscsi_eh_target_reset,
         .use_clustering         = DISABLE_CLUSTERING,
         .slave_configure        = iscsi_tcp_slave_configure,
         .proc_name              = "iscsi_tcp",
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index da7b67d30d9a..801c7cf54d2e 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -404,11 +404,6 @@ static void fail_command(struct iscsi_conn *conn, struct iscsi_task *task,
                 conn->session->queued_cmdsn--;
         else
                 conn->session->tt->cleanup_task(conn, task);
-        /*
-         * Check if cleanup_task dropped the lock and the command completed,
-         */
-        if (!task->sc)
-                return;
 
         sc->result = err;
         if (!scsi_bidi_cmnd(sc))
@@ -633,6 +628,40 @@ out:
         __iscsi_put_task(task);
 }
 
+/**
+ * iscsi_data_in_rsp - SCSI Data-In Response processing
+ * @conn: iscsi connection
+ * @hdr:  iscsi pdu
+ * @task: scsi command task
+ **/
+static void
+iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
+                  struct iscsi_task *task)
+{
+        struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr;
+        struct scsi_cmnd *sc = task->sc;
+
+        if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS))
+                return;
+
+        sc->result = (DID_OK << 16) | rhdr->cmd_status;
+        conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
+        if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW |
+                           ISCSI_FLAG_DATA_OVERFLOW)) {
+                int res_count = be32_to_cpu(rhdr->residual_count);
+
+                if (res_count > 0 &&
+                    (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
+                     res_count <= scsi_in(sc)->length))
+                        scsi_in(sc)->resid = res_count;
+                else
+                        sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
+        }
+
+        conn->scsirsp_pdus_cnt++;
+        __iscsi_put_task(task);
+}
+
 static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
 {
         struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
@@ -818,12 +847,7 @@ int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
                 iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen);
                 break;
         case ISCSI_OP_SCSI_DATA_IN:
-                if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
-                        conn->scsirsp_pdus_cnt++;
-                        iscsi_update_cmdsn(session,
-                                           (struct iscsi_nopin*) hdr);
-                        __iscsi_put_task(task);
-                }
+                iscsi_data_in_rsp(conn, hdr, task);
                 break;
         case ISCSI_OP_LOGOUT_RSP:
                 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
@@ -954,6 +978,38 @@ struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt)
 }
 EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask);
 
+void iscsi_session_failure(struct iscsi_cls_session *cls_session,
+                           enum iscsi_err err)
+{
+        struct iscsi_session *session = cls_session->dd_data;
+        struct iscsi_conn *conn;
+        struct device *dev;
+        unsigned long flags;
+
+        spin_lock_irqsave(&session->lock, flags);
+        conn = session->leadconn;
+        if (session->state == ISCSI_STATE_TERMINATE || !conn) {
+                spin_unlock_irqrestore(&session->lock, flags);
+                return;
+        }
+
+        dev = get_device(&conn->cls_conn->dev);
+        spin_unlock_irqrestore(&session->lock, flags);
+        if (!dev)
+                return;
+        /*
+         * if the host is being removed bypass the connection
+         * recovery initialization because we are going to kill
+         * the session.
+         */
+        if (err == ISCSI_ERR_INVALID_HOST)
+                iscsi_conn_error_event(conn->cls_conn, err);
+        else
+                iscsi_conn_failure(conn, err);
+        put_device(dev);
+}
+EXPORT_SYMBOL_GPL(iscsi_session_failure);
+
 void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
 {
         struct iscsi_session *session = conn->session;
@@ -968,9 +1024,10 @@ void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
         if (conn->stop_stage == 0)
                 session->state = ISCSI_STATE_FAILED;
         spin_unlock_irqrestore(&session->lock, flags);
+
         set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
         set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
-        iscsi_conn_error(conn->cls_conn, err);
+        iscsi_conn_error_event(conn->cls_conn, err);
 }
 EXPORT_SYMBOL_GPL(iscsi_conn_failure);
 
@@ -1194,15 +1251,13 @@ int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
                 switch (session->state) {
                 case ISCSI_STATE_IN_RECOVERY:
                         reason = FAILURE_SESSION_IN_RECOVERY;
-                        sc->result = DID_IMM_RETRY << 16;
-                        break;
+                        goto reject;
                 case ISCSI_STATE_LOGGING_OUT:
                         reason = FAILURE_SESSION_LOGGING_OUT;
-                        sc->result = DID_IMM_RETRY << 16;
-                        break;
+                        goto reject;
                 case ISCSI_STATE_RECOVERY_FAILED:
                         reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
-                        sc->result = DID_NO_CONNECT << 16;
+                        sc->result = DID_TRANSPORT_FAILFAST << 16;
                         break;
                 case ISCSI_STATE_TERMINATE:
                         reason = FAILURE_SESSION_TERMINATE;
@@ -1267,7 +1322,7 @@ reject:
         spin_unlock(&session->lock);
         debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
         spin_lock(host->host_lock);
-        return SCSI_MLQUEUE_HOST_BUSY;
+        return SCSI_MLQUEUE_TARGET_BUSY;
 
 fault:
         spin_unlock(&session->lock);
@@ -1307,7 +1362,7 @@ void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
 }
 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
 
-int iscsi_eh_host_reset(struct scsi_cmnd *sc)
+int iscsi_eh_target_reset(struct scsi_cmnd *sc)
 {
         struct iscsi_cls_session *cls_session;
         struct iscsi_session *session;
@@ -1321,7 +1376,7 @@ int iscsi_eh_host_reset(struct scsi_cmnd *sc)
         spin_lock_bh(&session->lock);
         if (session->state == ISCSI_STATE_TERMINATE) {
 failed:
-                debug_scsi("failing host reset: session terminated "
+                debug_scsi("failing target reset: session terminated "
                            "[CID %d age %d]\n", conn->id, session->age);
                 spin_unlock_bh(&session->lock);
                 mutex_unlock(&session->eh_mutex);
@@ -1336,7 +1391,7 @@ failed:
          */
         iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
 
-        debug_scsi("iscsi_eh_host_reset wait for relogin\n");
+        debug_scsi("iscsi_eh_target_reset wait for relogin\n");
         wait_event_interruptible(conn->ehwait,
                                  session->state == ISCSI_STATE_TERMINATE ||
                                  session->state == ISCSI_STATE_LOGGED_IN ||
@@ -1348,14 +1403,14 @@ failed:
         spin_lock_bh(&session->lock);
         if (session->state == ISCSI_STATE_LOGGED_IN)
                 iscsi_session_printk(KERN_INFO, session,
-                                     "host reset succeeded\n");
+                                     "target reset succeeded\n");
         else
                 goto failed;
         spin_unlock_bh(&session->lock);
         mutex_unlock(&session->eh_mutex);
         return SUCCESS;
 }
-EXPORT_SYMBOL_GPL(iscsi_eh_host_reset);
+EXPORT_SYMBOL_GPL(iscsi_eh_target_reset);
 
 static void iscsi_tmf_timedout(unsigned long data)
 {
@@ -1769,10 +1824,10 @@ int iscsi_eh_device_reset(struct scsi_cmnd *sc)
 
         iscsi_suspend_tx(conn);
 
-        spin_lock(&session->lock);
+        spin_lock_bh(&session->lock);
         fail_all_commands(conn, sc->device->lun, DID_ERROR);
         conn->tmf_state = TMF_INITIAL;
-        spin_unlock(&session->lock);
+        spin_unlock_bh(&session->lock);
 
         iscsi_start_tx(conn);
         goto done;
@@ -1878,6 +1933,7 @@ struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
                                    int dd_data_size, uint16_t qdepth)
 {
         struct Scsi_Host *shost;
+        struct iscsi_host *ihost;
 
         shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size);
         if (!shost)
@@ -1892,22 +1948,43 @@ struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
                 qdepth = ISCSI_DEF_CMD_PER_LUN;
         }
         shost->cmd_per_lun = qdepth;
+
+        ihost = shost_priv(shost);
+        spin_lock_init(&ihost->lock);
+        ihost->state = ISCSI_HOST_SETUP;
+        ihost->num_sessions = 0;
+        init_waitqueue_head(&ihost->session_removal_wq);
         return shost;
 }
 EXPORT_SYMBOL_GPL(iscsi_host_alloc);
 
+static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session)
+{
+        iscsi_session_failure(cls_session, ISCSI_ERR_INVALID_HOST);
+}
+
 /**
  * iscsi_host_remove - remove host and sessions
  * @shost: scsi host
  *
- * This will also remove any sessions attached to the host, but if userspace
- * is managing the session at the same time this will break. TODO: add
- * refcounting to the netlink iscsi interface so a rmmod or host hot unplug
- * does not remove the memory from under us.
+ * If there are any sessions left, this will initiate the removal and wait
+ * for the completion.
  */
 void iscsi_host_remove(struct Scsi_Host *shost)
 {
-        iscsi_host_for_each_session(shost, iscsi_session_teardown);
+        struct iscsi_host *ihost = shost_priv(shost);
+        unsigned long flags;
+
+        spin_lock_irqsave(&ihost->lock, flags);
+        ihost->state = ISCSI_HOST_REMOVED;
+        spin_unlock_irqrestore(&ihost->lock, flags);
+
+        iscsi_host_for_each_session(shost, iscsi_notify_host_removed);
+        wait_event_interruptible(ihost->session_removal_wq,
+                                 ihost->num_sessions == 0);
+        if (signal_pending(current))
+                flush_signals(current);
+
         scsi_remove_host(shost);
 }
 EXPORT_SYMBOL_GPL(iscsi_host_remove);
@@ -1923,6 +2000,27 @@ void iscsi_host_free(struct Scsi_Host *shost)
 }
 EXPORT_SYMBOL_GPL(iscsi_host_free);
 
+static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost)
+{
+        struct iscsi_host *ihost = shost_priv(shost);
+        unsigned long flags;
+
+        shost = scsi_host_get(shost);
+        if (!shost) {
+                printk(KERN_ERR "Invalid state. Cannot notify host removal "
+                      "of session teardown event because host already "
+                      "removed.\n");
+                return;
+        }
+
+        spin_lock_irqsave(&ihost->lock, flags);
+        ihost->num_sessions--;
+        if (ihost->num_sessions == 0)
+                wake_up(&ihost->session_removal_wq);
+        spin_unlock_irqrestore(&ihost->lock, flags);
+        scsi_host_put(shost);
+}
+
 /**
  * iscsi_session_setup - create iscsi cls session and host and session
  * @iscsit: iscsi transport template
@@ -1943,9 +2041,19 @@ iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
                     uint16_t cmds_max, int cmd_task_size,
                     uint32_t initial_cmdsn, unsigned int id)
 {
+        struct iscsi_host *ihost = shost_priv(shost);
         struct iscsi_session *session;
         struct iscsi_cls_session *cls_session;
         int cmd_i, scsi_cmds, total_cmds = cmds_max;
+        unsigned long flags;
+
+        spin_lock_irqsave(&ihost->lock, flags);
+        if (ihost->state == ISCSI_HOST_REMOVED) {
+                spin_unlock_irqrestore(&ihost->lock, flags);
+                return NULL;
+        }
+        ihost->num_sessions++;
+        spin_unlock_irqrestore(&ihost->lock, flags);
 
         if (!total_cmds)
                 total_cmds = ISCSI_DEF_XMIT_CMDS_MAX;
@@ -1958,7 +2066,7 @@ iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
                 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
                        "must be a power of two that is at least %d.\n",
                        total_cmds, ISCSI_TOTAL_CMDS_MIN);
-                return NULL;
+                goto dec_session_count;
         }
 
         if (total_cmds > ISCSI_TOTAL_CMDS_MAX) {
@@ -1982,7 +2090,7 @@ iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
         cls_session = iscsi_alloc_session(shost, iscsit,
                                           sizeof(struct iscsi_session));
         if (!cls_session)
-                return NULL;
+                goto dec_session_count;
         session = cls_session->dd_data;
         session->cls_session = cls_session;
         session->host = shost;
@@ -2021,6 +2129,7 @@ iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
 
         if (iscsi_add_session(cls_session, id))
                 goto cls_session_fail;
+
         return cls_session;
 
 cls_session_fail:
@@ -2029,6 +2138,8 @@ module_get_fail:
         iscsi_pool_free(&session->cmdpool);
 cmdpool_alloc_fail:
         iscsi_free_session(cls_session);
+dec_session_count:
+        iscsi_host_dec_session_cnt(shost);
         return NULL;
 }
 EXPORT_SYMBOL_GPL(iscsi_session_setup);
@@ -2044,6 +2155,7 @@ void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
 {
         struct iscsi_session *session = cls_session->dd_data;
         struct module *owner = cls_session->transport->owner;
+        struct Scsi_Host *shost = session->host;
 
         iscsi_pool_free(&session->cmdpool);
 
@@ -2056,6 +2168,7 @@ void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
         kfree(session->ifacename);
 
         iscsi_destroy_session(cls_session);
+        iscsi_host_dec_session_cnt(shost);
         module_put(owner);
 }
 EXPORT_SYMBOL_GPL(iscsi_session_teardown);
@@ -2335,8 +2448,10 @@ static void iscsi_start_session_recovery(struct iscsi_session *session,
          * flush queues.
          */
         spin_lock_bh(&session->lock);
-        fail_all_commands(conn, -1,
-                        STOP_CONN_RECOVER ? DID_BUS_BUSY : DID_ERROR);
+        if (flag == STOP_CONN_RECOVER)
+                fail_all_commands(conn, -1, DID_TRANSPORT_DISRUPTED);
+        else
+                fail_all_commands(conn, -1, DID_ERROR);
         flush_control_queues(session, conn);
         spin_unlock_bh(&session->lock);
         mutex_unlock(&session->eh_mutex);
diff --git a/drivers/scsi/lpfc/lpfc.h b/drivers/scsi/lpfc/lpfc.h
index e0e018d12653..60a9e6e9384b 100644
--- a/drivers/scsi/lpfc/lpfc.h
+++ b/drivers/scsi/lpfc/lpfc.h
@@ -34,7 +34,14 @@ struct lpfc_sli2_slim;
 #define LPFC_IOCB_LIST_CNT      2250    /* list of IOCBs for fast-path usage. */
 #define LPFC_Q_RAMP_UP_INTERVAL 120     /* lun q_depth ramp up interval */
 #define LPFC_VNAME_LEN          100     /* vport symbolic name length */
-
+#define LPFC_TGTQ_INTERVAL      40000   /* Min amount of time between tgt
+                                           queue depth change in millisecs */
+#define LPFC_TGTQ_RAMPUP_PCENT  5       /* Target queue rampup in percentage */
+#define LPFC_MIN_TGT_QDEPTH     100
+#define LPFC_MAX_TGT_QDEPTH     0xFFFF
+
+#define  LPFC_MAX_BUCKET_COUNT 20       /* Maximum no. of buckets for stat data
+                                           collection. */
 /*
  * Following time intervals are used of adjusting SCSI device
  * queue depths when there are driver resource error or Firmware
@@ -49,6 +56,9 @@ struct lpfc_sli2_slim;
 #define LPFC_HB_MBOX_INTERVAL   5       /* Heart beat interval in seconds. */
 #define LPFC_HB_MBOX_TIMEOUT    30      /* Heart beat timeout  in seconds. */
 
+/* Error Attention event polling interval */
+#define LPFC_ERATT_POLL_INTERVAL        5 /* EATT poll interval in seconds */
+
 /* Define macros for 64 bit support */
 #define putPaddrLow(addr)    ((uint32_t) (0xffffffff & (u64)(addr)))
 #define putPaddrHigh(addr)   ((uint32_t) (0xffffffff & (((u64)(addr))>>32)))
@@ -60,6 +70,9 @@ struct lpfc_sli2_slim;
 
 #define MAX_HBAEVT      32
 
+/* Number of MSI-X vectors the driver uses */
+#define LPFC_MSIX_VECTORS       2
+
 /* lpfc wait event data ready flag */
 #define LPFC_DATA_READY         (1<<0)
 
@@ -357,6 +370,7 @@ struct lpfc_vport {
         uint32_t cfg_log_verbose;
         uint32_t cfg_max_luns;
         uint32_t cfg_enable_da_id;
+        uint32_t cfg_max_scsicmpl_time;
 
         uint32_t dev_loss_tmo_changed;
 
@@ -369,6 +383,8 @@ struct lpfc_vport {
         struct lpfc_debugfs_trc *disc_trc;
         atomic_t disc_trc_cnt;
 #endif
+        uint8_t stat_data_enabled;
+        uint8_t stat_data_blocked;
 };
 
 struct hbq_s {
@@ -407,10 +423,11 @@ struct lpfc_hba {
         struct lpfc_sli sli;
         uint32_t sli_rev;               /* SLI2 or SLI3 */
         uint32_t sli3_options;          /* Mask of enabled SLI3 options */
-#define LPFC_SLI3_ENABLED        0x01
-#define LPFC_SLI3_HBQ_ENABLED    0x02
-#define LPFC_SLI3_NPIV_ENABLED   0x04
-#define LPFC_SLI3_VPORT_TEARDOWN 0x08
+#define LPFC_SLI3_HBQ_ENABLED           0x01
+#define LPFC_SLI3_NPIV_ENABLED          0x02
+#define LPFC_SLI3_VPORT_TEARDOWN        0x04
+#define LPFC_SLI3_CRP_ENABLED           0x08
+#define LPFC_SLI3_INB_ENABLED           0x10
         uint32_t iocb_cmd_size;
         uint32_t iocb_rsp_size;
 
@@ -422,10 +439,20 @@ struct lpfc_hba {
 #define LS_NPIV_FAB_SUPPORTED 0x2       /* Fabric supports NPIV */
 #define LS_IGNORE_ERATT       0x4       /* intr handler should ignore ERATT */
 
-        struct lpfc_sli2_slim *slim2p;
-        struct lpfc_dmabuf hbqslimp;
+        uint32_t hba_flag;      /* hba generic flags */
+#define HBA_ERATT_HANDLED       0x1 /* This flag is set when eratt handled */
+
+        struct lpfc_dmabuf slim2p;
 
-        dma_addr_t slim2p_mapping;
+        MAILBOX_t *mbox;
+        uint32_t *inb_ha_copy;
+        uint32_t *inb_counter;
+        uint32_t inb_last_counter;
+        uint32_t ha_copy;
+        struct _PCB *pcb;
+        struct _IOCB *IOCBs;
+
+        struct lpfc_dmabuf hbqslimp;
 
         uint16_t pci_cfg_value;
 
@@ -492,7 +519,7 @@ struct lpfc_hba {
 
         wait_queue_head_t    work_waitq;
         struct task_struct   *worker_thread;
-        long data_flags;
+        unsigned long data_flags;
 
         uint32_t hbq_in_use;            /* HBQs in use flag */
         struct list_head hbqbuf_in_list;  /* in-fly hbq buffer list */
@@ -514,6 +541,7 @@ struct lpfc_hba {
         void __iomem *HCregaddr;        /* virtual address for host ctl reg */
 
         struct lpfc_hgp __iomem *host_gp; /* Host side get/put pointers */
+        struct lpfc_pgp   *port_gp;
         uint32_t __iomem  *hbq_put;     /* Address in SLIM to HBQ put ptrs */
         uint32_t          *hbq_get;     /* Host mem address of HBQ get ptrs */
 
@@ -536,6 +564,7 @@ struct lpfc_hba {
         uint8_t soft_wwn_enable;
 
         struct timer_list fcp_poll_timer;
+        struct timer_list eratt_poll;
 
         /*
          * stat  counters
@@ -565,7 +594,7 @@ struct lpfc_hba {
 
         struct fc_host_statistics link_stats;
         enum intr_type_t intr_type;
-        struct msix_entry msix_entries[1];
+        struct msix_entry msix_entries[LPFC_MSIX_VECTORS];
 
         struct list_head port_list;
         struct lpfc_vport *pport;       /* physical lpfc_vport pointer */
@@ -605,6 +634,7 @@ struct lpfc_hba {
         unsigned long last_completion_time;
         struct timer_list hb_tmofunc;
         uint8_t hb_outstanding;
+        enum hba_temp_state over_temp_state;
         /* ndlp reference management */
         spinlock_t ndlp_lock;
         /*
@@ -613,7 +643,19 @@ struct lpfc_hba {
          */
 #define QUE_BUFTAG_BIT  (1<<31)
         uint32_t buffer_tag_count;
-        enum hba_temp_state over_temp_state;
+        int wait_4_mlo_maint_flg;
+        wait_queue_head_t wait_4_mlo_m_q;
+        /* data structure used for latency data collection */
+#define LPFC_NO_BUCKET     0
+#define LPFC_LINEAR_BUCKET 1
+#define LPFC_POWER2_BUCKET 2
+        uint8_t  bucket_type;
+        uint32_t bucket_base;
+        uint32_t bucket_step;
+
+/* Maximum number of events that can be outstanding at any time*/
+#define LPFC_MAX_EVT_COUNT 512
+        atomic_t fast_event_count;
 };
 
 static inline struct Scsi_Host *
@@ -650,15 +692,25 @@ lpfc_worker_wake_up(struct lpfc_hba *phba)
         return;
 }
 
-#define FC_REG_DUMP_EVENT               0x10    /* Register for Dump events */
-#define FC_REG_TEMPERATURE_EVENT        0x20    /* Register for temperature
-                                                   event */
+static inline void
+lpfc_sli_read_hs(struct lpfc_hba *phba)
+{
+        /*
+         * There was a link/board error. Read the status register to retrieve
+         * the error event and process it.
+         */
+        phba->sli.slistat.err_attn_event++;
+
+        /* Save status info */
+        phba->work_hs = readl(phba->HSregaddr);
+        phba->work_status[0] = readl(phba->MBslimaddr + 0xa8);
+        phba->work_status[1] = readl(phba->MBslimaddr + 0xac);
+
+        /* Clear chip Host Attention error bit */
+        writel(HA_ERATT, phba->HAregaddr);
+        readl(phba->HAregaddr); /* flush */
+        phba->pport->stopped = 1;
+
+        return;
+}
 
-struct temp_event {
-        uint32_t event_type;
-        uint32_t event_code;
-        uint32_t data;
-};
-#define LPFC_CRIT_TEMP          0x1
-#define LPFC_THRESHOLD_TEMP     0x2
-#define LPFC_NORMAL_TEMP        0x3
diff --git a/drivers/scsi/lpfc/lpfc_attr.c b/drivers/scsi/lpfc/lpfc_attr.c
index 37bfa0bd1dae..aa3d6277581d 100644
--- a/drivers/scsi/lpfc/lpfc_attr.c
+++ b/drivers/scsi/lpfc/lpfc_attr.c
@@ -32,6 +32,7 @@
 
 #include "lpfc_hw.h"
 #include "lpfc_sli.h"
+#include "lpfc_nl.h"
 #include "lpfc_disc.h"
 #include "lpfc_scsi.h"
 #include "lpfc.h"
@@ -49,6 +50,21 @@
 #define LPFC_LINK_SPEED_BITMAP 0x00000117
 #define LPFC_LINK_SPEED_STRING "0, 1, 2, 4, 8"
 
+/**
+ * lpfc_jedec_to_ascii: Hex to ascii convertor according to JEDEC rules.
+ * @incr: integer to convert.
+ * @hdw: ascii string holding converted integer plus a string terminator.
+ *
+ * Description:
+ * JEDEC Joint Electron Device Engineering Council.
+ * Convert a 32 bit integer composed of 8 nibbles into an 8 byte ascii
+ * character string. The string is then terminated with a NULL in byte 9.
+ * Hex 0-9 becomes ascii '0' to '9'.
+ * Hex a-f becomes ascii '=' to 'B' capital B.
+ *
+ * Notes:
+ * Coded for 32 bit integers only.
+ **/
 static void
 lpfc_jedec_to_ascii(int incr, char hdw[])
 {
@@ -65,6 +81,14 @@ lpfc_jedec_to_ascii(int incr, char hdw[])
         return;
 }
 
+/**
+ * lpfc_drvr_version_show: Return the Emulex driver string with version number.
+ * @dev: class unused variable.
+ * @attr: device attribute, not used.
+ * @buf: on return contains the module description text.
+ *
+ * Returns: size of formatted string.
+ **/
 static ssize_t
 lpfc_drvr_version_show(struct device *dev, struct device_attribute *attr,
                        char *buf)
@@ -72,6 +96,14 @@ lpfc_drvr_version_show(struct device *dev, struct device_attribute *attr,
         return snprintf(buf, PAGE_SIZE, LPFC_MODULE_DESC "\n");
 }
 
+/**
+ * lpfc_info_show: Return some pci info about the host in ascii.
+ * @dev: class converted to a Scsi_host structure.
+ * @attr: device attribute, not used.
+ * @buf: on return contains the formatted text from lpfc_info().
+ *
+ * Returns: size of formatted string.
+ **/
 static ssize_t
 lpfc_info_show(struct device *dev, struct device_attribute *attr,
                char *buf)
@@ -81,6 +113,14 @@ lpfc_info_show(struct device *dev, struct device_attribute *attr,
         return snprintf(buf, PAGE_SIZE, "%s\n",lpfc_info(host));
 }
 
+/**
+ * lpfc_serialnum_show: Return the hba serial number in ascii.
+ * @dev: class converted to a Scsi_host structure.
+ * @attr: device attribute, not used.
+ * @buf: on return contains the formatted text serial number.
+ *
+ * Returns: size of formatted string.
+ **/
 static ssize_t
 lpfc_serialnum_show(struct device *dev, struct device_attribute *attr,
                     char *buf)
@@ -92,6 +132,18 @@ lpfc_serialnum_show(struct device *dev, struct device_attribute *attr,
         return snprintf(buf, PAGE_SIZE, "%s\n",phba->SerialNumber);
 }
 
+/**
+ * lpfc_temp_sensor_show: Return the temperature sensor level.
+ * @dev: class converted to a Scsi_host structure.
+ * @attr: device attribute, not used.
+ * @buf: on return contains the formatted support level.
+ *
+ * Description:
+ * Returns a number indicating the temperature sensor level currently
+ * supported, zero or one in ascii.
+ *
+ * Returns: size of formatted string.
+ **/
 static ssize_t
 lpfc_temp_sensor_show(struct device *dev, struct device_attribute *attr,
                       char *buf)
@@ -102,6 +154,14 @@ lpfc_temp_sensor_show(struct device *dev, struct device_attribute *attr,
         return snprintf(buf, PAGE_SIZE, "%d\n",phba->temp_sensor_support);
 }
 
+/**
+ * lpfc_modeldesc_show: Return the model description of the hba.
+ * @dev: class converted to a Scsi_host structure.
+ * @attr: device attribute, not used.
+ * @buf: on return contains the scsi vpd model description.
+ *
+ * Returns: size of formatted string.
+ **/
 static ssize_t
 lpfc_modeldesc_show(struct device *dev, struct device_attribute *attr,
                     char *buf)
@@ -113,6 +173,14 @@ lpfc_modeldesc_show(struct device *dev, struct device_attribute *attr,
         return snprintf(buf, PAGE_SIZE, "%s\n",phba->ModelDesc);
 }
 
+/**
+ * lpfc_modelname_show: Return the model name of the hba.
+ * @dev: class converted to a Scsi_host structure.
+ * @attr: device attribute, not used.
+ * @buf: on return contains the scsi vpd model name.
+ *
+ * Returns: size of formatted string.
+ **/
 static ssize_t
 lpfc_modelname_show(struct device *dev, struct device_attribute *attr,
                     char *buf)
@@ -124,6 +192,14 @@ lpfc_modelname_show(struct device *dev, struct device_attribute *attr,
         return snprintf(buf, PAGE_SIZE, "%s\n",phba->ModelName);
 }
 
+/**
+ * lpfc_programtype_show: Return the program type of the hba.
+ * @dev: class converted to a Scsi_host structure.
+ * @attr: device attribute, not used.
+ * @buf: on return contains the scsi vpd program type.
+ *
+ * Returns: size of formatted string.
+ **/
 static ssize_t
 lpfc_programtype_show(struct device *dev, struct device_attribute *attr,
                       char *buf)
@@ -135,6 +211,33 @@ lpfc_programtype_show(struct device *dev, struct device_attribute *attr,
         return snprintf(buf, PAGE_SIZE, "%s\n",phba->ProgramType);
 }
 
+/**
+ * lpfc_mlomgmt_show: Return the Menlo Maintenance sli flag.
+ * @dev: class converted to a Scsi_host structure.
+ * @attr: device attribute, not used.
+ * @buf: on return contains the Menlo Maintenance sli flag.
+ *
+ * Returns: size of formatted string.
+ **/
+static ssize_t
+lpfc_mlomgmt_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct Scsi_Host  *shost = class_to_shost(dev);
+        struct lpfc_vport *vport = (struct lpfc_vport *)shost->hostdata;
+        struct lpfc_hba   *phba = vport->phba;
+
+        return snprintf(buf, PAGE_SIZE, "%d\n",
+                (phba->sli.sli_flag & LPFC_MENLO_MAINT));
+}
+
+/**
+ * lpfc_vportnum_show: Return the port number in ascii of the hba.
+ * @dev: class converted to a Scsi_host structure.
+ * @attr: device attribute, not used.
+ * @buf: on return contains scsi vpd program type.
+ *
+ * Returns: size of formatted string.
+ **/
 static ssize_t
 lpfc_vportnum_show(struct device *dev, struct device_attribute *attr,
                    char *buf)
@@ -146,6 +249,14 @@ lpfc_vportnum_show(struct device *dev, struct device_attribute *attr,
         return snprintf(buf, PAGE_SIZE, "%s\n",phba->Port);
 }
 
+/**
+ * lpfc_fwrev_show: Return the firmware rev running in the hba.
+ * @dev: class converted to a Scsi_host structure.
+ * @attr: device attribute, not used.
+ * @buf: on return contains the scsi vpd program type.
+ *
+ * Returns: size of formatted string.
+ **/
 static ssize_t
 lpfc_fwrev_show(struct device *dev, struct device_attribute *attr,
                 char *buf)
@@ -159,6 +270,14 @@ lpfc_fwrev_show(struct device *dev, struct device_attribute *attr,
         return snprintf(buf, PAGE_SIZE, "%s, sli-%d\n", fwrev, phba->sli_rev);
 }
 
+/**
+ * lpfc_hdw_show: Return the jedec information about the hba.
+ * @dev: class converted to a Scsi_host structure.
+ * @attr: device attribute, not used.
+ * @buf: on return contains the scsi vpd program type.
+ *
+ * Returns: size of formatted string.
+ **/
 static ssize_t
 lpfc_hdw_show(struct device *dev, struct device_attribute *attr, char *buf)
 {
@@ -171,6 +290,15 @@ lpfc_hdw_show(struct device *dev, struct device_attribute *attr, char *buf)
         lpfc_jedec_to_ascii(vp->rev.biuRev, hdw);
         return snprintf(buf, PAGE_SIZE, "%s\n", hdw);
 }
+
+/**
+ * lpfc_option_rom_version_show: Return the adapter ROM FCode version.
+ * @dev: class converted to a Scsi_host structure.
+ * @attr: device attribute, not used.
+ * @buf: on return contains the ROM and FCode ascii strings.
+ *
+ * Returns: size of formatted string.
+ **/
 static ssize_t
 lpfc_option_rom_version_show(struct device *dev, struct device_attribute *attr,
                              char *buf)
@@ -181,6 +309,18 @@ lpfc_option_rom_version_show(struct device *dev, struct device_attribute *attr,
 
         return snprintf(buf, PAGE_SIZE, "%s\n", phba->OptionROMVersion);
 }
+
+/**
+ * lpfc_state_show: Return the link state of the port.
+ * @dev: class converted to a Scsi_host structure.
+ * @attr: device attribute, not used.
+ * @buf: on return contains text describing the state of the link.
+ *
+ * Notes:
+ * The switch statement has no default so zero will be returned.
+ *
+ * Returns: size of formatted string.
+ **/
 static ssize_t
 lpfc_link_state_show(struct device *dev, struct device_attribute *attr,
                      char *buf)
@@ -232,8 +372,10 @@ lpfc_link_state_show(struct device *dev, struct device_attribute *attr,
                                         "Unknown\n");
                         break;
                 }
-
-                if (phba->fc_topology == TOPOLOGY_LOOP) {
+                if (phba->sli.sli_flag & LPFC_MENLO_MAINT)
+                        len += snprintf(buf + len, PAGE_SIZE-len,
+                                        "   Menlo Maint Mode\n");
+                else if (phba->fc_topology == TOPOLOGY_LOOP) {
                         if (vport->fc_flag & FC_PUBLIC_LOOP)
                                 len += snprintf(buf + len, PAGE_SIZE-len,
                                                 "   Public Loop\n");
@@ -253,6 +395,18 @@ lpfc_link_state_show(struct device *dev, struct device_attribute *attr,
         return len;
 }
 
+/**
+ * lpfc_num_discovered_ports_show: Return sum of mapped and unmapped vports.
+ * @dev: class device that is converted into a Scsi_host.
+ * @attr: device attribute, not used.
+ * @buf: on return contains the sum of fc mapped and unmapped.
+ *
+ * Description:
+ * Returns the ascii text number of the sum of the fc mapped and unmapped
+ * vport counts.
+ *
+ * Returns: size of formatted string.
+ **/
 static ssize_t
 lpfc_num_discovered_ports_show(struct device *dev,
                                struct device_attribute *attr, char *buf)
@@ -264,7 +418,20 @@ lpfc_num_discovered_ports_show(struct device *dev,
                         vport->fc_map_cnt + vport->fc_unmap_cnt);
 }
 
-
+/**
+ * lpfc_issue_lip: Misnomer, name carried over from long ago.
+ * @shost: Scsi_Host pointer.
+ *
+ * Description:
+ * Bring the link down gracefully then re-init the link. The firmware will
+ * re-init the fiber channel interface as required. Does not issue a LIP.
+ *
+ * Returns:
+ * -EPERM port offline or management commands are being blocked
+ * -ENOMEM cannot allocate memory for the mailbox command
+ * -EIO error sending the mailbox command
+ * zero for success
+ **/
 static int
 lpfc_issue_lip(struct Scsi_Host *shost)
 {
@@ -306,6 +473,21 @@ lpfc_issue_lip(struct Scsi_Host *shost)
         return 0;
 }
 
+/**
+ * lpfc_do_offline: Issues a mailbox command to bring the link down.
+ * @phba: lpfc_hba pointer.
+ * @type: LPFC_EVT_OFFLINE, LPFC_EVT_WARM_START, LPFC_EVT_KILL.
+ *
+ * Notes:
+ * Assumes any error from lpfc_do_offline() will be negative.
+ * Can wait up to 5 seconds for the port ring buffers count
+ * to reach zero, prints a warning if it is not zero and continues.
+ * lpfc_workq_post_event() returns a non-zero return coce if call fails.
+ *
+ * Returns:
+ * -EIO error posting the event
+ * zero for success
+ **/
 static int
 lpfc_do_offline(struct lpfc_hba *phba, uint32_t type)
 {
@@ -353,6 +535,22 @@ lpfc_do_offline(struct lpfc_hba *phba, uint32_t type)
         return 0;
 }
 
+/**
+ * lpfc_selective_reset: Offline then onlines the port.
+ * @phba: lpfc_hba pointer.
+ *
+ * Description:
+ * If the port is configured to allow a reset then the hba is brought
+ * offline then online.
+ *
+ * Notes:
+ * Assumes any error from lpfc_do_offline() will be negative.
+ *
+ * Returns:
+ * lpfc_do_offline() return code if not zero
+ * -EIO reset not configured or error posting the event
+ * zero for success
+ **/
 static int
 lpfc_selective_reset(struct lpfc_hba *phba)
 {
@@ -378,6 +576,27 @@ lpfc_selective_reset(struct lpfc_hba *phba)
         return 0;
 }
 
+/**
+ * lpfc_issue_reset: Selectively resets an adapter.
+ * @dev: class device that is converted into a Scsi_host.
+ * @attr: device attribute, not used.
+ * @buf: containing the string "selective".
+ * @count: unused variable.
+ *
+ * Description:
+ * If the buf contains the string "selective" then lpfc_selective_reset()
+ * is called to perform the reset.
+ *
+ * Notes:
+ * Assumes any error from lpfc_selective_reset() will be negative.
+ * If lpfc_selective_reset() returns zero then the length of the buffer
+ * is returned which indicates succcess
+ *
+ * Returns:
+ * -EINVAL if the buffer does not contain the string "selective"
+ * length of buf if lpfc-selective_reset() if the call succeeds
+ * return value of lpfc_selective_reset() if the call fails
+**/
 static ssize_t
 lpfc_issue_reset(struct device *dev, struct device_attribute *attr,
                  const char *buf, size_t count)
@@ -397,6 +616,14 @@ lpfc_issue_reset(struct device *dev, struct device_attribute *attr,
                 return status;
 }
 
+/**
+ * lpfc_nport_evt_cnt_show: Return the number of nport events.
+ * @dev: class device that is converted into a Scsi_host.
+ * @attr: device attribute, not used.
+ * @buf: on return contains the ascii number of nport events.
+ *
+ * Returns: size of formatted string.
+ **/
 static ssize_t
 lpfc_nport_evt_cnt_show(struct device *dev, struct device_attribute *attr,
                         char *buf)
@@ -408,6 +635,14 @@ lpfc_nport_evt_cnt_show(struct device *dev, struct device_attribute *attr,
         return snprintf(buf, PAGE_SIZE, "%d\n", phba->nport_event_cnt);
 }
 
+/**
+ * lpfc_board_mode_show: Return the state of the board.
+ * @dev: class device that is converted into a Scsi_host.
+ * @attr: device attribute, not used.
+ * @buf: on return contains the state of the adapter.
+ *
+ * Returns: size of formatted string.
+ **/
 static ssize_t
 lpfc_board_mode_show(struct device *dev, struct device_attribute *attr,
                      char *buf)
@@ -429,6 +664,19 @@ lpfc_board_mode_show(struct device *dev, struct device_attribute *attr,
         return snprintf(buf, PAGE_SIZE, "%s\n", state);
 }
 
+/**
+ * lpfc_board_mode_store: Puts the hba in online, offline, warm or error state.
+ * @dev: class device that is converted into a Scsi_host.
+ * @attr: device attribute, not used.
+ * @buf: containing one of the strings "online", "offline", "warm" or "error".
+ * @count: unused variable.
+ *
+ * Returns:
+ * -EACCES if enable hba reset not enabled
+ * -EINVAL if the buffer does not contain a valid string (see above)
+ * -EIO if lpfc_workq_post_event() or lpfc_do_offline() fails
+ * buf length greater than zero indicates success
+ **/
 static ssize_t
 lpfc_board_mode_store(struct device *dev, struct device_attribute *attr,
                       const char *buf, size_t count)
@@ -462,6 +710,24 @@ lpfc_board_mode_store(struct device *dev, struct device_attribute *attr,
                 return -EIO;
 }
 
+/**
+ * lpfc_get_hba_info: Return various bits of informaton about the adapter.
+ * @phba: pointer to the adapter structure.
+ * @mxri max xri count.
+ * @axri available xri count.
+ * @mrpi max rpi count.
+ * @arpi available rpi count.
+ * @mvpi max vpi count.
+ * @avpi available vpi count.
+ *
+ * Description:
+ * If an integer pointer for an count is not null then the value for the
+ * count is returned.
+ *
+ * Returns:
+ * zero on error
+ * one for success
+ **/
 static int
 lpfc_get_hba_info(struct lpfc_hba *phba,
                   uint32_t *mxri, uint32_t *axri,
@@ -524,6 +790,20 @@ lpfc_get_hba_info(struct lpfc_hba *phba,
         return 1;
 }
 
+/**
+ * lpfc_max_rpi_show: Return maximum rpi.
+ * @dev: class device that is converted into a Scsi_host.
+ * @attr: device attribute, not used.
+ * @buf: on return contains the maximum rpi count in decimal or "Unknown".
+ *
+ * Description:
+ * Calls lpfc_get_hba_info() asking for just the mrpi count.
+ * If lpfc_get_hba_info() returns zero (failure) the buffer text is set
+ * to "Unknown" and the buffer length is returned, therefore the caller
+ * must check for "Unknown" in the buffer to detect a failure.
+ *
+ * Returns: size of formatted string.
+ **/
 static ssize_t
 lpfc_max_rpi_show(struct device *dev, struct device_attribute *attr,
                   char *buf)
@@ -538,6 +818,20 @@ lpfc_max_rpi_show(struct device *dev, struct device_attribute *attr,
         return snprintf(buf, PAGE_SIZE, "Unknown\n");
 }
 
+/**
+ * lpfc_used_rpi_show: Return maximum rpi minus available rpi.
+ * @dev: class device that is converted into a Scsi_host.
+ * @attr: device attribute, not used.
+ * @buf: containing the used rpi count in decimal or "Unknown".
+ *
+ * Description:
+ * Calls lpfc_get_hba_info() asking for just the mrpi and arpi counts.
+ * If lpfc_get_hba_info() returns zero (failure) the buffer text is set
+ * to "Unknown" and the buffer length is returned, therefore the caller
+ * must check for "Unknown" in the buffer to detect a failure.
+ *
+ * Returns: size of formatted string.
+ **/
 static ssize_t
 lpfc_used_rpi_show(struct device *dev, struct device_attribute *attr,
                    char *buf)
@@ -552,6 +846,20 @@ lpfc_used_rpi_show(struct device *dev, struct device_attribute *attr,
         return snprintf(buf, PAGE_SIZE, "Unknown\n");
 }
 
+/**
+ * lpfc_max_xri_show: Return maximum xri.
+ * @dev: class device that is converted into a Scsi_host.
+ * @attr: device attribute, not used.
+ * @buf: on return contains the maximum xri count in decimal or "Unknown".
+ *
+ * Description:
+ * Calls lpfc_get_hba_info() asking for just the mrpi count.
+ * If lpfc_get_hba_info() returns zero (failure) the buffer text is set
+ * to "Unknown" and the buffer length is returned, therefore the caller
+ * must check for "Unknown" in the buffer to detect a failure.
+ *
+ * Returns: size of formatted string.
+ **/
 static ssize_t
 lpfc_max_xri_show(struct device *dev, struct device_attribute *attr,
                   char *buf)
@@ -566,6 +874,20 @@ lpfc_max_xri_show(struct device *dev, struct device_attribute *attr,
         return snprintf(buf, PAGE_SIZE, "Unknown\n");
 }
 
+/**
+ * lpfc_used_xri_show: Return maximum xpi minus the available xpi.
+ * @dev: class device that is converted into a Scsi_host.
+ * @attr: device attribute, not used.
+ * @buf: on return contains the used xri count in decimal or "Unknown".
+ *
+ * Description:
+ * Calls lpfc_get_hba_info() asking for just the mxri and axri counts.
+ * If lpfc_get_hba_info() returns zero (failure) the buffer text is set
+ * to "Unknown" and the buffer length is returned, therefore the caller
+ * must check for "Unknown" in the buffer to detect a failure.
+ *
+ * Returns: size of formatted string.
+ **/
 static ssize_t
 lpfc_used_xri_show(struct device *dev, struct device_attribute *attr,
                    char *buf)
@@ -580,6 +902,20 @@ lpfc_used_xri_show(struct device *dev, struct device_attribute *attr,
         return snprintf(buf, PAGE_SIZE, "Unknown\n");
 }
 
+/**
+ * lpfc_max_vpi_show: Return maximum vpi.
+ * @dev: class device that is converted into a Scsi_host.
+ * @attr: device attribute, not used.
+ * @buf: on return contains the maximum vpi count in decimal or "Unknown".
+ *
+ * Description:
+ * Calls lpfc_get_hba_info() asking for just the mvpi count.
+ * If lpfc_get_hba_info() returns zero (failure) the buffer text is set
+ * to "Unknown" and the buffer length is returned, therefore the caller
+ * must check for "Unknown" in the buffer to detect a failure.
+ *
+ * Returns: size of formatted string.
+ **/
 static ssize_t
 lpfc_max_vpi_show(struct device *dev, struct device_attribute *attr,
                   char *buf)
@@ -594,6 +930,20 @@ lpfc_max_vpi_show(struct device *dev, struct device_attribute *attr,
         return snprintf(buf, PAGE_SIZE, "Unknown\n");
 }
 
+/**
+ * lpfc_used_vpi_show: Return maximum vpi minus the available vpi.
+ * @dev: class device that is converted into a Scsi_host.
+ * @attr: device attribute, not used.
+ * @buf: on return contains the used vpi count in decimal or "Unknown".
+ *
+ * Description:
+ * Calls lpfc_get_hba_info() asking for just the mvpi and avpi counts.
+ * If lpfc_get_hba_info() returns zero (failure) the buffer text is set
+ * to "Unknown" and the buffer length is returned, therefore the caller
+ * must check for "Unknown" in the buffer to detect a failure.
+ *
+ * Returns: size of formatted string.
+ **/
 static ssize_t
 lpfc_used_vpi_show(struct device *dev, struct device_attribute *attr,
                    char *buf)
@@ -608,6 +958,19 @@ lpfc_used_vpi_show(struct device *dev, struct device_attribute *attr,
         return snprintf(buf, PAGE_SIZE, "Unknown\n");
 }
 
+/**
+ * lpfc_npiv_info_show: Return text about NPIV support for the adapter.
+ * @dev: class device that is converted into a Scsi_host.
+ * @attr: device attribute, not used.
+ * @buf: text that must be interpreted to determine if npiv is supported.
+ *
+ * Description:
+ * Buffer will contain text indicating npiv is not suppoerted on the port,
+ * the port is an NPIV physical port, or it is an npiv virtual port with
+ * the id of the vport.
+ *
+ * Returns: size of formatted string.
+ **/
 static ssize_t
 lpfc_npiv_info_show(struct device *dev, struct device_attribute *attr,
                     char *buf)
@@ -623,6 +986,17 @@ lpfc_npiv_info_show(struct device *dev, struct device_attribute *attr,
         return snprintf(buf, PAGE_SIZE, "NPIV Virtual (VPI %d)\n", vport->vpi);
 }
 
+/**
+ * lpfc_poll_show: Return text about poll support for the adapter.
+ * @dev: class device that is converted into a Scsi_host.
+ * @attr: device attribute, not used.
+ * @buf: on return contains the cfg_poll in hex.
+ *
+ * Notes:
+ * cfg_poll should be a lpfc_polling_flags type.
+ *
+ * Returns: size of formatted string.
+ **/
 static ssize_t
 lpfc_poll_show(struct device *dev, struct device_attribute *attr,
                char *buf)
@@ -634,6 +1008,20 @@ lpfc_poll_show(struct device *dev, struct device_attribute *attr,
         return snprintf(buf, PAGE_SIZE, "%#x\n", phba->cfg_poll);
 }
 
+/**
+ * lpfc_poll_store: Set the value of cfg_poll for the adapter.
+ * @dev: class device that is converted into a Scsi_host.
+ * @attr: device attribute, not used.
+ * @buf: one or more lpfc_polling_flags values.
+ * @count: not used.
+ *
+ * Notes:
+ * buf contents converted to integer and checked for a valid value.
+ *
+ * Returns:
+ * -EINVAL if the buffer connot be converted or is out of range
+ * length of the buf on success
+ **/
 static ssize_t
 lpfc_poll_store(struct device *dev, struct device_attribute *attr,
                 const char *buf, size_t count)
@@ -692,6 +1080,20 @@ lpfc_poll_store(struct device *dev, struct device_attribute *attr,
         return strlen(buf);
 }
 
+/**
+ * lpfc_param_show: Return a cfg attribute value in decimal.
+ *
+ * Description:
+ * Macro that given an attr e.g. hba_queue_depth expands
+ * into a function with the name lpfc_hba_queue_depth_show.
+ *
+ * lpfc_##attr##_show: Return the decimal value of an adapters cfg_xxx field.
+ * @dev: class device that is converted into a Scsi_host.
+ * @attr: device attribute, not used.
+ * @buf: on return contains the attribute value in decimal.
+ *
+ * Returns: size of formatted string.
+ **/
 #define lpfc_param_show(attr)   \
 static ssize_t \
 lpfc_##attr##_show(struct device *dev, struct device_attribute *attr, \
@@ -706,6 +1108,20 @@ lpfc_##attr##_show(struct device *dev, struct device_attribute *attr, \
                         phba->cfg_##attr);\
 }
 
+/**
+ * lpfc_param_hex_show: Return a cfg attribute value in hex.
+ *
+ * Description:
+ * Macro that given an attr e.g. hba_queue_depth expands
+ * into a function with the name lpfc_hba_queue_depth_show
+ *
+ * lpfc_##attr##_show: Return the hex value of an adapters cfg_xxx field.
+ * @dev: class device that is converted into a Scsi_host.
+ * @attr: device attribute, not used.
+ * @buf: on return contains the attribute value in hexidecimal.
+ *
+ * Returns: size of formatted string.
+ **/
 #define lpfc_param_hex_show(attr)       \
 static ssize_t \
 lpfc_##attr##_show(struct device *dev, struct device_attribute *attr, \
@@ -720,6 +1136,25 @@ lpfc_##attr##_show(struct device *dev, struct device_attribute *attr, \
                         phba->cfg_##attr);\
 }
 
+/**
+ * lpfc_param_init: Intializes a cfg attribute.
+ *
+ * Description:
+ * Macro that given an attr e.g. hba_queue_depth expands
+ * into a function with the name lpfc_hba_queue_depth_init. The macro also
+ * takes a default argument, a minimum and maximum argument.
+ *
+ * lpfc_##attr##_init: Initializes an attribute.
+ * @phba: pointer the the adapter structure.
+ * @val: integer attribute value.
+ *
+ * Validates the min and max values then sets the adapter config field
+ * accordingly, or uses the default if out of range and prints an error message.
+ *
+ * Returns:
+ * zero on success
+ * -EINVAL if default used
+ **/
 #define lpfc_param_init(attr, default, minval, maxval)  \
 static int \
 lpfc_##attr##_init(struct lpfc_hba *phba, int val) \
@@ -735,6 +1170,26 @@ lpfc_##attr##_init(struct lpfc_hba *phba, int val) \
         return -EINVAL;\
 }
 
+/**
+ * lpfc_param_set: Set a cfg attribute value.
+ *
+ * Description:
+ * Macro that given an attr e.g. hba_queue_depth expands
+ * into a function with the name lpfc_hba_queue_depth_set
+ *
+ * lpfc_##attr##_set: Sets an attribute value.
+ * @phba: pointer the the adapter structure.
+ * @val: integer attribute value.
+ *
+ * Description:
+ * Validates the min and max values then sets the
+ * adapter config field if in the valid range. prints error message
+ * and does not set the parameter if invalid.
+ *
+ * Returns:
+ * zero on success
+ * -EINVAL if val is invalid
+ **/
 #define lpfc_param_set(attr, default, minval, maxval)   \
 static int \
 lpfc_##attr##_set(struct lpfc_hba *phba, int val) \
@@ -749,6 +1204,27 @@ lpfc_##attr##_set(struct lpfc_hba *phba, int val) \
         return -EINVAL;\
 }
 
+/**
+ * lpfc_param_store: Set a vport attribute value.
+ *
+ * Description:
+ * Macro that given an attr e.g. hba_queue_depth expands
+ * into a function with the name lpfc_hba_queue_depth_store.
+ *
+ * lpfc_##attr##_store: Set an sttribute value.
+ * @dev: class device that is converted into a Scsi_host.
+ * @attr: device attribute, not used.
+ * @buf: contains the attribute value in ascii.
+ * @count: not used.
+ *
+ * Description:
+ * Convert the ascii text number to an integer, then
+ * use the lpfc_##attr##_set function to set the value.
+ *
+ * Returns:
+ * -EINVAL if val is invalid or lpfc_##attr##_set() fails
+ * length of buffer upon success.
+ **/
 #define lpfc_param_store(attr)  \
 static ssize_t \
 lpfc_##attr##_store(struct device *dev, struct device_attribute *attr, \
@@ -768,6 +1244,20 @@ lpfc_##attr##_store(struct device *dev, struct device_attribute *attr, \
                 return -EINVAL;\
 }
 
+/**
+ * lpfc_vport_param_show: Return decimal formatted cfg attribute value.
+ *
+ * Description:
+ * Macro that given an attr e.g. hba_queue_depth expands
+ * into a function with the name lpfc_hba_queue_depth_show
+ *
+ * lpfc_##attr##_show: prints the attribute value in decimal.
+ * @dev: class device that is converted into a Scsi_host.
+ * @attr: device attribute, not used.
+ * @buf: on return contains the attribute value in decimal.
+ *
+ * Returns: length of formatted string.
+ **/
 #define lpfc_vport_param_show(attr)     \
 static ssize_t \
 lpfc_##attr##_show(struct device *dev, struct device_attribute *attr, \
@@ -780,6 +1270,21 @@ lpfc_##attr##_show(struct device *dev, struct device_attribute *attr, \
         return snprintf(buf, PAGE_SIZE, "%d\n", vport->cfg_##attr);\
 }
 
+/**
+ * lpfc_vport_param_hex_show: Return hex formatted attribute value.
+ *
+ * Description:
+ * Macro that given an attr e.g.
+ * hba_queue_depth expands into a function with the name
+ * lpfc_hba_queue_depth_show
+ *
+ * lpfc_##attr##_show: prints the attribute value in hexidecimal.
+ * @dev: class device that is converted into a Scsi_host.
+ * @attr: device attribute, not used.
+ * @buf: on return contains the attribute value in hexidecimal.
+ *
+ * Returns: length of formatted string.
+ **/
 #define lpfc_vport_param_hex_show(attr) \
 static ssize_t \
 lpfc_##attr##_show(struct device *dev, struct device_attribute *attr, \
@@ -792,6 +1297,24 @@ lpfc_##attr##_show(struct device *dev, struct device_attribute *attr, \
         return snprintf(buf, PAGE_SIZE, "%#x\n", vport->cfg_##attr);\
 }
 
+/**
+ * lpfc_vport_param_init: Initialize a vport cfg attribute.
+ *
+ * Description:
+ * Macro that given an attr e.g. hba_queue_depth expands
+ * into a function with the name lpfc_hba_queue_depth_init. The macro also
+ * takes a default argument, a minimum and maximum argument.
+ *
+ * lpfc_##attr##_init: validates the min and max values then sets the
+ * adapter config field accordingly, or uses the default if out of range
+ * and prints an error message.
+ * @phba: pointer the the adapter structure.
+ * @val: integer attribute value.
+ *
+ * Returns:
+ * zero on success
+ * -EINVAL if default used
+ **/
 #define lpfc_vport_param_init(attr, default, minval, maxval)    \
 static int \
 lpfc_##attr##_init(struct lpfc_vport *vport, int val) \
@@ -801,12 +1324,29 @@ lpfc_##attr##_init(struct lpfc_vport *vport, int val) \
                 return 0;\
         }\
         lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT, \
-                         "0449 lpfc_"#attr" attribute cannot be set to %d, "\
+                         "0423 lpfc_"#attr" attribute cannot be set to %d, "\
                          "allowed range is ["#minval", "#maxval"]\n", val); \
         vport->cfg_##attr = default;\
         return -EINVAL;\
 }
 
+/**
+ * lpfc_vport_param_set: Set a vport cfg attribute.
+ *
+ * Description:
+ * Macro that given an attr e.g. hba_queue_depth expands
+ * into a function with the name lpfc_hba_queue_depth_set
+ *
+ * lpfc_##attr##_set: validates the min and max values then sets the
+ * adapter config field if in the valid range. prints error message
+ * and does not set the parameter if invalid.
+ * @phba: pointer the the adapter structure.
+ * @val:        integer attribute value.
+ *
+ * Returns:
+ * zero on success
+ * -EINVAL if val is invalid
+ **/
 #define lpfc_vport_param_set(attr, default, minval, maxval)     \
 static int \
 lpfc_##attr##_set(struct lpfc_vport *vport, int val) \
@@ -816,11 +1356,28 @@ lpfc_##attr##_set(struct lpfc_vport *vport, int val) \
                 return 0;\
         }\
         lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT, \
-                         "0450 lpfc_"#attr" attribute cannot be set to %d, "\
+                         "0424 lpfc_"#attr" attribute cannot be set to %d, "\
                          "allowed range is ["#minval", "#maxval"]\n", val); \
         return -EINVAL;\
 }
 
+/**
+ * lpfc_vport_param_store: Set a vport attribute.
+ *
+ * Description:
+ * Macro that given an attr e.g. hba_queue_depth
+ * expands into a function with the name lpfc_hba_queue_depth_store
+ *
+ * lpfc_##attr##_store: convert the ascii text number to an integer, then
+ * use the lpfc_##attr##_set function to set the value.
+ * @cdev: class device that is converted into a Scsi_host.
+ * @buf:        contains the attribute value in decimal.
+ * @count: not used.
+ *
+ * Returns:
+ * -EINVAL if val is invalid or lpfc_##attr##_set() fails
+ * length of buffer upon success.
+ **/
 #define lpfc_vport_param_store(attr)    \
 static ssize_t \
 lpfc_##attr##_store(struct device *dev, struct device_attribute *attr, \
@@ -941,6 +1498,7 @@ static DEVICE_ATTR(option_rom_version, S_IRUGO,
                    lpfc_option_rom_version_show, NULL);
 static DEVICE_ATTR(num_discovered_ports, S_IRUGO,
                    lpfc_num_discovered_ports_show, NULL);
+static DEVICE_ATTR(menlo_mgmt_mode, S_IRUGO, lpfc_mlomgmt_show, NULL);
 static DEVICE_ATTR(nport_evt_cnt, S_IRUGO, lpfc_nport_evt_cnt_show, NULL);
 static DEVICE_ATTR(lpfc_drvr_version, S_IRUGO, lpfc_drvr_version_show, NULL);
 static DEVICE_ATTR(board_mode, S_IRUGO | S_IWUSR,
@@ -958,6 +1516,17 @@ static DEVICE_ATTR(lpfc_temp_sensor, S_IRUGO, lpfc_temp_sensor_show, NULL);
 
 static char *lpfc_soft_wwn_key = "C99G71SL8032A";
 
+/**
+ * lpfc_soft_wwn_enable_store: Allows setting of the wwn if the key is valid.
+ * @dev: class device that is converted into a Scsi_host.
+ * @attr: device attribute, not used.
+ * @buf: containing the string lpfc_soft_wwn_key.
+ * @count: must be size of lpfc_soft_wwn_key.
+ *
+ * Returns:
+ * -EINVAL if the buffer does not contain lpfc_soft_wwn_key
+ * length of buf indicates success
+ **/
 static ssize_t
 lpfc_soft_wwn_enable_store(struct device *dev, struct device_attribute *attr,
                            const char *buf, size_t count)
@@ -994,6 +1563,14 @@ lpfc_soft_wwn_enable_store(struct device *dev, struct device_attribute *attr,
 static DEVICE_ATTR(lpfc_soft_wwn_enable, S_IWUSR, NULL,
                    lpfc_soft_wwn_enable_store);
 
+/**
+ * lpfc_soft_wwpn_show: Return the cfg soft ww port name of the adapter.
+ * @dev: class device that is converted into a Scsi_host.
+ * @attr: device attribute, not used.
+ * @buf: on return contains the wwpn in hexidecimal.
+ *
+ * Returns: size of formatted string.
+ **/
 static ssize_t
 lpfc_soft_wwpn_show(struct device *dev, struct device_attribute *attr,
                     char *buf)
@@ -1006,7 +1583,19 @@ lpfc_soft_wwpn_show(struct device *dev, struct device_attribute *attr,
                         (unsigned long long)phba->cfg_soft_wwpn);
 }
 
-
+/**
+ * lpfc_soft_wwpn_store: Set the ww port name of the adapter.
+ * @dev class device that is converted into a Scsi_host.
+ * @attr: device attribute, not used.
+ * @buf: contains the wwpn in hexidecimal.
+ * @count: number of wwpn bytes in buf
+ *
+ * Returns:
+ * -EACCES hba reset not enabled, adapter over temp
+ * -EINVAL soft wwn not enabled, count is invalid, invalid wwpn byte invalid
+ * -EIO error taking adapter offline or online
+ * value of count on success
+ **/
 static ssize_t
 lpfc_soft_wwpn_store(struct device *dev, struct device_attribute *attr,
                      const char *buf, size_t count)
@@ -1080,6 +1669,14 @@ lpfc_soft_wwpn_store(struct device *dev, struct device_attribute *attr,
 static DEVICE_ATTR(lpfc_soft_wwpn, S_IRUGO | S_IWUSR,\
                    lpfc_soft_wwpn_show, lpfc_soft_wwpn_store);
 
+/**
+ * lpfc_soft_wwnn_show: Return the cfg soft ww node name for the adapter.
+ * @dev: class device that is converted into a Scsi_host.
+ * @attr: device attribute, not used.
+ * @buf: on return contains the wwnn in hexidecimal.
+ *
+ * Returns: size of formatted string.
+ **/
 static ssize_t
 lpfc_soft_wwnn_show(struct device *dev, struct device_attribute *attr,
                     char *buf)
@@ -1090,7 +1687,16 @@ lpfc_soft_wwnn_show(struct device *dev, struct device_attribute *attr,
                         (unsigned long long)phba->cfg_soft_wwnn);
 }
 
-
+/**
+ * lpfc_soft_wwnn_store: sets the ww node name of the adapter.
+ * @cdev: class device that is converted into a Scsi_host.
+ * @buf: contains the ww node name in hexidecimal.
+ * @count: number of wwnn bytes in buf.
+ *
+ * Returns:
+ * -EINVAL soft wwn not enabled, count is invalid, invalid wwnn byte invalid
+ * value of count on success
+ **/
 static ssize_t
 lpfc_soft_wwnn_store(struct device *dev, struct device_attribute *attr,
                      const char *buf, size_t count)
@@ -1178,6 +1784,15 @@ module_param(lpfc_nodev_tmo, int, 0);
 MODULE_PARM_DESC(lpfc_nodev_tmo,
                  "Seconds driver will hold I/O waiting "
                  "for a device to come back");
+
+/**
+ * lpfc_nodev_tmo_show: Return the hba dev loss timeout value.
+ * @dev: class converted to a Scsi_host structure.
+ * @attr: device attribute, not used.
+ * @buf: on return contains the dev loss timeout in decimal.
+ *
+ * Returns: size of formatted string.
+ **/
 static ssize_t
 lpfc_nodev_tmo_show(struct device *dev, struct device_attribute *attr,
                     char *buf)
@@ -1189,6 +1804,21 @@ lpfc_nodev_tmo_show(struct device *dev, struct device_attribute *attr,
         return snprintf(buf, PAGE_SIZE, "%d\n", vport->cfg_devloss_tmo);
 }
 
+/**
+ * lpfc_nodev_tmo_init: Set the hba nodev timeout value.
+ * @vport: lpfc vport structure pointer.
+ * @val: contains the nodev timeout value.
+ *
+ * Description:
+ * If the devloss tmo is already set then nodev tmo is set to devloss tmo,
+ * a kernel error message is printed and zero is returned.
+ * Else if val is in range then nodev tmo and devloss tmo are set to val.
+ * Otherwise nodev tmo is set to the default value.
+ *
+ * Returns:
+ * zero if already set or if val is in range
+ * -EINVAL val out of range
+ **/
 static int
 lpfc_nodev_tmo_init(struct lpfc_vport *vport, int val)
 {
@@ -1196,7 +1826,7 @@ lpfc_nodev_tmo_init(struct lpfc_vport *vport, int val)
                 vport->cfg_nodev_tmo = vport->cfg_devloss_tmo;
                 if (val != LPFC_DEF_DEVLOSS_TMO)
                         lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT,
-                                         "0402 Ignoring nodev_tmo module "
+                                         "0407 Ignoring nodev_tmo module "
                                          "parameter because devloss_tmo is "
                                          "set.\n");
                 return 0;
@@ -1215,6 +1845,13 @@ lpfc_nodev_tmo_init(struct lpfc_vport *vport, int val)
         return -EINVAL;
 }
 
+/**
+ * lpfc_update_rport_devloss_tmo: Update dev loss tmo value.
+ * @vport: lpfc vport structure pointer.
+ *
+ * Description:
+ * Update all the ndlp's dev loss tmo with the vport devloss tmo value.
+ **/
 static void
 lpfc_update_rport_devloss_tmo(struct lpfc_vport *vport)
 {
@@ -1229,6 +1866,21 @@ lpfc_update_rport_devloss_tmo(struct lpfc_vport *vport)
         spin_unlock_irq(shost->host_lock);
 }
 
+/**
+ * lpfc_nodev_tmo_set: Set the vport nodev tmo and devloss tmo values.
+ * @vport: lpfc vport structure pointer.
+ * @val: contains the tmo value.
+ *
+ * Description:
+ * If the devloss tmo is already set or the vport dev loss tmo has changed
+ * then a kernel error message is printed and zero is returned.
+ * Else if val is in range then nodev tmo and devloss tmo are set to val.
+ * Otherwise nodev tmo is set to the default value.
+ *
+ * Returns:
+ * zero if already set or if val is in range
+ * -EINVAL val out of range
+ **/
 static int
 lpfc_nodev_tmo_set(struct lpfc_vport *vport, int val)
 {
@@ -1269,6 +1921,21 @@ MODULE_PARM_DESC(lpfc_devloss_tmo,
 lpfc_vport_param_init(devloss_tmo, LPFC_DEF_DEVLOSS_TMO,
                       LPFC_MIN_DEVLOSS_TMO, LPFC_MAX_DEVLOSS_TMO)
 lpfc_vport_param_show(devloss_tmo)
+
+/**
+ * lpfc_devloss_tmo_set: Sets vport nodev tmo, devloss tmo values, changed bit.
+ * @vport: lpfc vport structure pointer.
+ * @val: contains the tmo value.
+ *
+ * Description:
+ * If val is in a valid range then set the vport nodev tmo,
+ * devloss tmo, also set the vport dev loss tmo changed flag.
+ * Else a kernel error message is printed.
+ *
+ * Returns:
+ * zero if val is in range
+ * -EINVAL val out of range
+ **/
 static int
 lpfc_devloss_tmo_set(struct lpfc_vport *vport, int val)
 {
@@ -1366,12 +2033,27 @@ MODULE_PARM_DESC(lpfc_restrict_login,
                  "Restrict virtual ports login to remote initiators.");
 lpfc_vport_param_show(restrict_login);
 
+/**
+ * lpfc_restrict_login_init: Set the vport restrict login flag.
+ * @vport: lpfc vport structure pointer.
+ * @val: contains the restrict login value.
+ *
+ * Description:
+ * If val is not in a valid range then log a kernel error message and set
+ * the vport restrict login to one.
+ * If the port type is physical clear the restrict login flag and return.
+ * Else set the restrict login flag to val.
+ *
+ * Returns:
+ * zero if val is in range
+ * -EINVAL val out of range
+ **/
 static int
 lpfc_restrict_login_init(struct lpfc_vport *vport, int val)
 {
         if (val < 0 || val > 1) {
                 lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT,
-                                 "0449 lpfc_restrict_login attribute cannot "
+                                 "0422 lpfc_restrict_login attribute cannot "
                                  "be set to %d, allowed range is [0, 1]\n",
                                  val);
                 vport->cfg_restrict_login = 1;
@@ -1385,12 +2067,28 @@ lpfc_restrict_login_init(struct lpfc_vport *vport, int val)
         return 0;
 }
 
+/**
+ * lpfc_restrict_login_set: Set the vport restrict login flag.
+ * @vport: lpfc vport structure pointer.
+ * @val: contains the restrict login value.
+ *
+ * Description:
+ * If val is not in a valid range then log a kernel error message and set
+ * the vport restrict login to one.
+ * If the port type is physical and the val is not zero log a kernel
+ * error message, clear the restrict login flag and return zero.
+ * Else set the restrict login flag to val.
+ *
+ * Returns:
+ * zero if val is in range
+ * -EINVAL val out of range
+ **/
 static int
 lpfc_restrict_login_set(struct lpfc_vport *vport, int val)
 {
         if (val < 0 || val > 1) {
                 lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT,
-                                 "0450 lpfc_restrict_login attribute cannot "
+                                 "0425 lpfc_restrict_login attribute cannot "
                                  "be set to %d, allowed range is [0, 1]\n",
                                  val);
                 vport->cfg_restrict_login = 1;
@@ -1441,6 +2139,23 @@ LPFC_VPORT_ATTR_R(scan_down, 1, 0, 1,
 # Set loop mode if you want to run as an NL_Port. Value range is [0,0x6].
 # Default value is 0.
 */
+
+/**
+ * lpfc_topology_set: Set the adapters topology field.
+ * @phba: lpfc_hba pointer.
+ * @val: topology value.
+ *
+ * Description:
+ * If val is in a valid range then set the adapter's topology field and
+ * issue a lip; if the lip fails reset the topology to the old value.
+ *
+ * If the value is not in range log a kernel error message and return an error.
+ *
+ * Returns:
+ * zero if val is in range and lip okay
+ * non-zero return value from lpfc_issue_lip()
+ * -EINVAL val out of range
+ **/
 static int
 lpfc_topology_set(struct lpfc_hba *phba, int val)
 {
@@ -1469,6 +2184,335 @@ lpfc_param_store(topology)
 static DEVICE_ATTR(lpfc_topology, S_IRUGO | S_IWUSR,
                 lpfc_topology_show, lpfc_topology_store);
 
+
+/**
+ * lpfc_stat_data_ctrl_store: write call back for lpfc_stat_data_ctrl
+ *  sysfs file.
+ * @dev: Pointer to class device.
+ * @buf: Data buffer.
+ * @count: Size of the data buffer.
+ *
+ * This function get called when an user write to the lpfc_stat_data_ctrl
+ * sysfs file. This function parse the command written to the sysfs file
+ * and take appropriate action. These commands are used for controlling
+ * driver statistical data collection.
+ * Following are the command this function handles.
+ *
+ *    setbucket <bucket_type> <base> <step>
+ *                             = Set the latency buckets.
+ *    destroybucket            = destroy all the buckets.
+ *    start                    = start data collection
+ *    stop                     = stop data collection
+ *    reset                    = reset the collected data
+ **/
+static ssize_t
+lpfc_stat_data_ctrl_store(struct device *dev, struct device_attribute *attr,
+                          const char *buf, size_t count)
+{
+        struct Scsi_Host  *shost = class_to_shost(dev);
+        struct lpfc_vport *vport = (struct lpfc_vport *) shost->hostdata;
+        struct lpfc_hba   *phba = vport->phba;
+#define LPFC_MAX_DATA_CTRL_LEN 1024
+        static char bucket_data[LPFC_MAX_DATA_CTRL_LEN];
+        unsigned long i;
+        char *str_ptr, *token;
+        struct lpfc_vport **vports;
+        struct Scsi_Host *v_shost;
+        char *bucket_type_str, *base_str, *step_str;
+        unsigned long base, step, bucket_type;
+
+        if (!strncmp(buf, "setbucket", strlen("setbucket"))) {
+                if (strlen(buf) > LPFC_MAX_DATA_CTRL_LEN)
+                        return -EINVAL;
+
+                strcpy(bucket_data, buf);
+                str_ptr = &bucket_data[0];
+                /* Ignore this token - this is command token */
+                token = strsep(&str_ptr, "\t ");
+                if (!token)
+                        return -EINVAL;
+
+                bucket_type_str = strsep(&str_ptr, "\t ");
+                if (!bucket_type_str)
+                        return -EINVAL;
+
+                if (!strncmp(bucket_type_str, "linear", strlen("linear")))
+                        bucket_type = LPFC_LINEAR_BUCKET;
+                else if (!strncmp(bucket_type_str, "power2", strlen("power2")))
+                        bucket_type = LPFC_POWER2_BUCKET;
+                else
+                        return -EINVAL;
+
+                base_str = strsep(&str_ptr, "\t ");
+                if (!base_str)
+                        return -EINVAL;
+                base = simple_strtoul(base_str, NULL, 0);
+
+                step_str = strsep(&str_ptr, "\t ");
+                if (!step_str)
+                        return -EINVAL;
+                step = simple_strtoul(step_str, NULL, 0);
+                if (!step)
+                        return -EINVAL;
+
+                /* Block the data collection for every vport */
+                vports = lpfc_create_vport_work_array(phba);
+                if (vports == NULL)
+                        return -ENOMEM;
+
+                for (i = 0; i <= phba->max_vpi && vports[i] != NULL; i++) {
+                        v_shost = lpfc_shost_from_vport(vports[i]);
+                        spin_lock_irq(v_shost->host_lock);
+                        /* Block and reset data collection */
+                        vports[i]->stat_data_blocked = 1;
+                        if (vports[i]->stat_data_enabled)
+                                lpfc_vport_reset_stat_data(vports[i]);
+                        spin_unlock_irq(v_shost->host_lock);
+                }
+
+                /* Set the bucket attributes */
+                phba->bucket_type = bucket_type;
+                phba->bucket_base = base;
+                phba->bucket_step = step;
+
+                for (i = 0; i <= phba->max_vpi && vports[i] != NULL; i++) {
+                        v_shost = lpfc_shost_from_vport(vports[i]);
+
+                        /* Unblock data collection */
+                        spin_lock_irq(v_shost->host_lock);
+                        vports[i]->stat_data_blocked = 0;
+                        spin_unlock_irq(v_shost->host_lock);
+                }
+                lpfc_destroy_vport_work_array(phba, vports);
+                return strlen(buf);
+        }
+
+        if (!strncmp(buf, "destroybucket", strlen("destroybucket"))) {
+                vports = lpfc_create_vport_work_array(phba);
+                if (vports == NULL)
+                        return -ENOMEM;
+
+                for (i = 0; i <= phba->max_vpi && vports[i] != NULL; i++) {
+                        v_shost = lpfc_shost_from_vport(vports[i]);
+                        spin_lock_irq(shost->host_lock);
+                        vports[i]->stat_data_blocked = 1;
+                        lpfc_free_bucket(vport);
+                        vport->stat_data_enabled = 0;
+                        vports[i]->stat_data_blocked = 0;
+                        spin_unlock_irq(shost->host_lock);
+                }
+                lpfc_destroy_vport_work_array(phba, vports);
+                phba->bucket_type = LPFC_NO_BUCKET;
+                phba->bucket_base = 0;
+                phba->bucket_step = 0;
+                return strlen(buf);
+        }
+
+        if (!strncmp(buf, "start", strlen("start"))) {
+                /* If no buckets configured return error */
+                if (phba->bucket_type == LPFC_NO_BUCKET)
+                        return -EINVAL;
+                spin_lock_irq(shost->host_lock);
+                if (vport->stat_data_enabled) {
+                        spin_unlock_irq(shost->host_lock);
+                        return strlen(buf);
+                }
+                lpfc_alloc_bucket(vport);
+                vport->stat_data_enabled = 1;
+                spin_unlock_irq(shost->host_lock);
+                return strlen(buf);
+        }
+
+        if (!strncmp(buf, "stop", strlen("stop"))) {
+                spin_lock_irq(shost->host_lock);
+                if (vport->stat_data_enabled == 0) {
+                        spin_unlock_irq(shost->host_lock);
+                        return strlen(buf);
+                }
+                lpfc_free_bucket(vport);
+                vport->stat_data_enabled = 0;
+                spin_unlock_irq(shost->host_lock);
+                return strlen(buf);
+        }
+
+        if (!strncmp(buf, "reset", strlen("reset"))) {
+                if ((phba->bucket_type == LPFC_NO_BUCKET)
+                        || !vport->stat_data_enabled)
+                        return strlen(buf);
+                spin_lock_irq(shost->host_lock);
+                vport->stat_data_blocked = 1;
+                lpfc_vport_reset_stat_data(vport);
+                vport->stat_data_blocked = 0;
+                spin_unlock_irq(shost->host_lock);
+                return strlen(buf);
+        }
+        return -EINVAL;
+}
+
+
+/**
+ * lpfc_stat_data_ctrl_show: Read callback function for
+ *   lpfc_stat_data_ctrl sysfs file.
+ * @dev: Pointer to class device object.
+ * @buf: Data buffer.
+ *
+ * This function is the read call back function for
+ * lpfc_stat_data_ctrl sysfs file. This function report the
+ * current statistical data collection state.
+ **/
+static ssize_t
+lpfc_stat_data_ctrl_show(struct device *dev, struct device_attribute *attr,
+                         char *buf)
+{
+        struct Scsi_Host  *shost = class_to_shost(dev);
+        struct lpfc_vport *vport = (struct lpfc_vport *) shost->hostdata;
+        struct lpfc_hba   *phba = vport->phba;
+        int index = 0;
+        int i;
+        char *bucket_type;
+        unsigned long bucket_value;
+
+        switch (phba->bucket_type) {
+        case LPFC_LINEAR_BUCKET:
+                bucket_type = "linear";
+                break;
+        case LPFC_POWER2_BUCKET:
+                bucket_type = "power2";
+                break;
+        default:
+                bucket_type = "No Bucket";
+                break;
+        }
+
+        sprintf(&buf[index], "Statistical Data enabled :%d, "
+                "blocked :%d, Bucket type :%s, Bucket base :%d,"
+                " Bucket step :%d\nLatency Ranges :",
+                vport->stat_data_enabled, vport->stat_data_blocked,
+                bucket_type, phba->bucket_base, phba->bucket_step);
+        index = strlen(buf);
+        if (phba->bucket_type != LPFC_NO_BUCKET) {
+                for (i = 0; i < LPFC_MAX_BUCKET_COUNT; i++) {
+                        if (phba->bucket_type == LPFC_LINEAR_BUCKET)
+                                bucket_value = phba->bucket_base +
+                                        phba->bucket_step * i;
+                        else
+                                bucket_value = phba->bucket_base +
+                                (1 << i) * phba->bucket_step;
+
+                        if (index + 10 > PAGE_SIZE)
+                                break;
+                        sprintf(&buf[index], "%08ld ", bucket_value);
+                        index = strlen(buf);
+                }
+        }
+        sprintf(&buf[index], "\n");
+        return strlen(buf);
+}
+
+/*
+ * Sysfs attribute to control the statistical data collection.
+ */
+static DEVICE_ATTR(lpfc_stat_data_ctrl, S_IRUGO | S_IWUSR,
+                   lpfc_stat_data_ctrl_show, lpfc_stat_data_ctrl_store);
+
+/*
+ * lpfc_drvr_stat_data: sysfs attr to get driver statistical data.
+ */
+
+/*
+ * Each Bucket takes 11 characters and 1 new line + 17 bytes WWN
+ * for each target.
+ */
+#define STAT_DATA_SIZE_PER_TARGET(NUM_BUCKETS) ((NUM_BUCKETS) * 11 + 18)
+#define MAX_STAT_DATA_SIZE_PER_TARGET \
+        STAT_DATA_SIZE_PER_TARGET(LPFC_MAX_BUCKET_COUNT)
+
+
+/**
+ * sysfs_drvr_stat_data_read: Read callback function for lpfc_drvr_stat_data
+ *  sysfs attribute.
+ * @kobj: Pointer to the kernel object
+ * @bin_attr: Attribute object
+ * @buff: Buffer pointer
+ * @off: File offset
+ * @count: Buffer size
+ *
+ * This function is the read call back function for lpfc_drvr_stat_data
+ * sysfs file. This function export the statistical data to user
+ * applications.
+ **/
+static ssize_t
+sysfs_drvr_stat_data_read(struct kobject *kobj, struct bin_attribute *bin_attr,
+                char *buf, loff_t off, size_t count)
+{
+        struct device *dev = container_of(kobj, struct device,
+                kobj);
+        struct Scsi_Host  *shost = class_to_shost(dev);
+        struct lpfc_vport *vport = (struct lpfc_vport *) shost->hostdata;
+        struct lpfc_hba   *phba = vport->phba;
+        int i = 0, index = 0;
+        unsigned long nport_index;
+        struct lpfc_nodelist *ndlp = NULL;
+        nport_index = (unsigned long)off /
+                MAX_STAT_DATA_SIZE_PER_TARGET;
+
+        if (!vport->stat_data_enabled || vport->stat_data_blocked
+                || (phba->bucket_type == LPFC_NO_BUCKET))
+                return 0;
+
+        spin_lock_irq(shost->host_lock);
+        list_for_each_entry(ndlp, &vport->fc_nodes, nlp_listp) {
+                if (!NLP_CHK_NODE_ACT(ndlp) || !ndlp->lat_data)
+                        continue;
+
+                if (nport_index > 0) {
+                        nport_index--;
+                        continue;
+                }
+
+                if ((index + MAX_STAT_DATA_SIZE_PER_TARGET)
+                        > count)
+                        break;
+
+                if (!ndlp->lat_data)
+                        continue;
+
+                /* Print the WWN */
+                sprintf(&buf[index], "%02x%02x%02x%02x%02x%02x%02x%02x:",
+                        ndlp->nlp_portname.u.wwn[0],
+                        ndlp->nlp_portname.u.wwn[1],
+                        ndlp->nlp_portname.u.wwn[2],
+                        ndlp->nlp_portname.u.wwn[3],
+                        ndlp->nlp_portname.u.wwn[4],
+                        ndlp->nlp_portname.u.wwn[5],
+                        ndlp->nlp_portname.u.wwn[6],
+                        ndlp->nlp_portname.u.wwn[7]);
+
+                index = strlen(buf);
+
+                for (i = 0; i < LPFC_MAX_BUCKET_COUNT; i++) {
+                        sprintf(&buf[index], "%010u,",
+                                ndlp->lat_data[i].cmd_count);
+                        index = strlen(buf);
+                }
+                sprintf(&buf[index], "\n");
+                index = strlen(buf);
+        }
+        spin_unlock_irq(shost->host_lock);
+        return index;
+}
+
+static struct bin_attribute sysfs_drvr_stat_data_attr = {
+        .attr = {
+                .name = "lpfc_drvr_stat_data",
+                .mode = S_IRUSR,
+                .owner = THIS_MODULE,
+        },
+        .size = LPFC_MAX_TARGET * MAX_STAT_DATA_SIZE_PER_TARGET,
+        .read = sysfs_drvr_stat_data_read,
+        .write = NULL,
+};
+
 /*
 # lpfc_link_speed: Link speed selection for initializing the Fibre Channel
 # connection.
@@ -1479,6 +2523,24 @@ static DEVICE_ATTR(lpfc_topology, S_IRUGO | S_IWUSR,
 #       8  = 8 Gigabaud
 # Value range is [0,8]. Default value is 0.
 */
+
+/**
+ * lpfc_link_speed_set: Set the adapters link speed.
+ * @phba: lpfc_hba pointer.
+ * @val: link speed value.
+ *
+ * Description:
+ * If val is in a valid range then set the adapter's link speed field and
+ * issue a lip; if the lip fails reset the link speed to the old value.
+ *
+ * Notes:
+ * If the value is not in range log a kernel error message and return an error.
+ *
+ * Returns:
+ * zero if val is in range and lip okay.
+ * non-zero return value from lpfc_issue_lip()
+ * -EINVAL val out of range
+ **/
 static int
 lpfc_link_speed_set(struct lpfc_hba *phba, int val)
 {
@@ -1513,6 +2575,23 @@ static int lpfc_link_speed = 0;
 module_param(lpfc_link_speed, int, 0);
 MODULE_PARM_DESC(lpfc_link_speed, "Select link speed");
 lpfc_param_show(link_speed)
+
+/**
+ * lpfc_link_speed_init: Set the adapters link speed.
+ * @phba: lpfc_hba pointer.
+ * @val: link speed value.
+ *
+ * Description:
+ * If val is in a valid range then set the adapter's link speed field.
+ *
+ * Notes:
+ * If the value is not in range log a kernel error message, clear the link
+ * speed and return an error.
+ *
+ * Returns:
+ * zero if val saved.
+ * -EINVAL val out of range
+ **/
 static int
 lpfc_link_speed_init(struct lpfc_hba *phba, int val)
 {
@@ -1522,7 +2601,7 @@ lpfc_link_speed_init(struct lpfc_hba *phba, int val)
                 return 0;
         }
         lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
-                        "0454 lpfc_link_speed attribute cannot "
+                        "0405 lpfc_link_speed attribute cannot "
                         "be set to %d, allowed values are "
                         "["LPFC_LINK_SPEED_STRING"]\n", val);
         phba->cfg_link_speed = 0;
@@ -1548,6 +2627,48 @@ LPFC_VPORT_ATTR_RW(use_adisc, 0, 0, 1,
                    "Use ADISC on rediscovery to authenticate FCP devices");
 
 /*
+# lpfc_max_scsicmpl_time: Use scsi command completion time to control I/O queue
+# depth. Default value is 0. When the value of this parameter is zero the
+# SCSI command completion time is not used for controlling I/O queue depth. When
+# the parameter is set to a non-zero value, the I/O queue depth is controlled
+# to limit the I/O completion time to the parameter value.
+# The value is set in milliseconds.
+*/
+static int lpfc_max_scsicmpl_time;
+module_param(lpfc_max_scsicmpl_time, int, 0);
+MODULE_PARM_DESC(lpfc_max_scsicmpl_time,
+        "Use command completion time to control queue depth");
+lpfc_vport_param_show(max_scsicmpl_time);
+lpfc_vport_param_init(max_scsicmpl_time, 0, 0, 60000);
+static int
+lpfc_max_scsicmpl_time_set(struct lpfc_vport *vport, int val)
+{
+        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
+        struct lpfc_nodelist *ndlp, *next_ndlp;
+
+        if (val == vport->cfg_max_scsicmpl_time)
+                return 0;
+        if ((val < 0) || (val > 60000))
+                return -EINVAL;
+        vport->cfg_max_scsicmpl_time = val;
+
+        spin_lock_irq(shost->host_lock);
+        list_for_each_entry_safe(ndlp, next_ndlp, &vport->fc_nodes, nlp_listp) {
+                if (!NLP_CHK_NODE_ACT(ndlp))
+                        continue;
+                if (ndlp->nlp_state == NLP_STE_UNUSED_NODE)
+                        continue;
+                ndlp->cmd_qdepth = LPFC_MAX_TGT_QDEPTH;
+        }
+        spin_unlock_irq(shost->host_lock);
+        return 0;
+}
+lpfc_vport_param_store(max_scsicmpl_time);
+static DEVICE_ATTR(lpfc_max_scsicmpl_time, S_IRUGO | S_IWUSR,
+                   lpfc_max_scsicmpl_time_show,
+                   lpfc_max_scsicmpl_time_store);
+
+/*
 # lpfc_ack0: Use ACK0, instead of ACK1 for class 2 acknowledgement. Value
 # range is [0,1]. Default value is 0.
 */
@@ -1623,12 +2744,12 @@ LPFC_ATTR_RW(poll_tmo, 10, 1, 255,
 /*
 # lpfc_use_msi: Use MSI (Message Signaled Interrupts) in systems that
 #               support this feature
-#       0  = MSI disabled (default)
+#       0  = MSI disabled
 #       1  = MSI enabled
-#       2  = MSI-X enabled
-# Value range is [0,2]. Default value is 0.
+#       2  = MSI-X enabled (default)
+# Value range is [0,2]. Default value is 2.
 */
-LPFC_ATTR_R(use_msi, 0, 0, 2, "Use Message Signaled Interrupts (1) or "
+LPFC_ATTR_R(use_msi, 2, 0, 2, "Use Message Signaled Interrupts (1) or "
             "MSI-X (2), if possible");
 
 /*
@@ -1668,6 +2789,7 @@ struct device_attribute *lpfc_hba_attrs[] = {
         &dev_attr_option_rom_version,
         &dev_attr_link_state,
         &dev_attr_num_discovered_ports,
+        &dev_attr_menlo_mgmt_mode,
         &dev_attr_lpfc_drvr_version,
         &dev_attr_lpfc_temp_sensor,
         &dev_attr_lpfc_log_verbose,
@@ -1709,6 +2831,8 @@ struct device_attribute *lpfc_hba_attrs[] = {
         &dev_attr_lpfc_enable_hba_reset,
         &dev_attr_lpfc_enable_hba_heartbeat,
         &dev_attr_lpfc_sg_seg_cnt,
+        &dev_attr_lpfc_max_scsicmpl_time,
+        &dev_attr_lpfc_stat_data_ctrl,
         NULL,
 };
 
@@ -1731,9 +2855,29 @@ struct device_attribute *lpfc_vport_attrs[] = {
         &dev_attr_nport_evt_cnt,
         &dev_attr_npiv_info,
         &dev_attr_lpfc_enable_da_id,
+        &dev_attr_lpfc_max_scsicmpl_time,
+        &dev_attr_lpfc_stat_data_ctrl,
         NULL,
 };
 
+/**
+ * sysfs_ctlreg_write: Write method for writing to ctlreg.
+ * @kobj: kernel kobject that contains the kernel class device.
+ * @bin_attr: kernel attributes passed to us.
+ * @buf: contains the data to be written to the adapter IOREG space.
+ * @off: offset into buffer to beginning of data.
+ * @count: bytes to transfer.
+ *
+ * Description:
+ * Accessed via /sys/class/scsi_host/hostxxx/ctlreg.
+ * Uses the adapter io control registers to send buf contents to the adapter.
+ *
+ * Returns:
+ * -ERANGE off and count combo out of range
+ * -EINVAL off, count or buff address invalid
+ * -EPERM adapter is offline
+ * value of count, buf contents written
+ **/
 static ssize_t
 sysfs_ctlreg_write(struct kobject *kobj, struct bin_attribute *bin_attr,
                    char *buf, loff_t off, size_t count)
@@ -1766,6 +2910,23 @@ sysfs_ctlreg_write(struct kobject *kobj, struct bin_attribute *bin_attr,
         return count;
 }
 
+/**
+ * sysfs_ctlreg_read: Read method for reading from ctlreg.
+ * @kobj: kernel kobject that contains the kernel class device.
+ * @bin_attr: kernel attributes passed to us.
+ * @buf: if succesful contains the data from the adapter IOREG space.
+ * @off: offset into buffer to beginning of data.
+ * @count: bytes to transfer.
+ *
+ * Description:
+ * Accessed via /sys/class/scsi_host/hostxxx/ctlreg.
+ * Uses the adapter io control registers to read data into buf.
+ *
+ * Returns:
+ * -ERANGE off and count combo out of range
+ * -EINVAL off, count or buff address invalid
+ * value of count, buf contents read
+ **/
 static ssize_t
 sysfs_ctlreg_read(struct kobject *kobj, struct bin_attribute *bin_attr,
                   char *buf, loff_t off, size_t count)
@@ -1810,7 +2971,10 @@ static struct bin_attribute sysfs_ctlreg_attr = {
         .write = sysfs_ctlreg_write,
 };
 
-
+/**
+ * sysfs_mbox_idle: frees the sysfs mailbox.
+ * @phba: lpfc_hba pointer
+ **/
 static void
 sysfs_mbox_idle(struct lpfc_hba *phba)
 {
@@ -1824,6 +2988,27 @@ sysfs_mbox_idle(struct lpfc_hba *phba)
         }
 }
 
+/**
+ * sysfs_mbox_write: Write method for writing information via mbox.
+ * @kobj: kernel kobject that contains the kernel class device.
+ * @bin_attr: kernel attributes passed to us.
+ * @buf: contains the data to be written to sysfs mbox.
+ * @off: offset into buffer to beginning of data.
+ * @count: bytes to transfer.
+ *
+ * Description:
+ * Accessed via /sys/class/scsi_host/hostxxx/mbox.
+ * Uses the sysfs mbox to send buf contents to the adapter.
+ *
+ * Returns:
+ * -ERANGE off and count combo out of range
+ * -EINVAL off, count or buff address invalid
+ * zero if count is zero
+ * -EPERM adapter is offline
+ * -ENOMEM failed to allocate memory for the mail box
+ * -EAGAIN offset, state or mbox is NULL
+ * count number of bytes transferred
+ **/
 static ssize_t
 sysfs_mbox_write(struct kobject *kobj, struct bin_attribute *bin_attr,
                  char *buf, loff_t off, size_t count)
@@ -1878,6 +3063,29 @@ sysfs_mbox_write(struct kobject *kobj, struct bin_attribute *bin_attr,
         return count;
 }
 
+/**
+ * sysfs_mbox_read: Read method for reading information via mbox.
+ * @kobj: kernel kobject that contains the kernel class device.
+ * @bin_attr: kernel attributes passed to us.
+ * @buf: contains the data to be read from sysfs mbox.
+ * @off: offset into buffer to beginning of data.
+ * @count: bytes to transfer.
+ *
+ * Description:
+ * Accessed via /sys/class/scsi_host/hostxxx/mbox.
+ * Uses the sysfs mbox to receive data from to the adapter.
+ *
+ * Returns:
+ * -ERANGE off greater than mailbox command size
+ * -EINVAL off, count or buff address invalid
+ * zero if off and count are zero
+ * -EACCES adapter over temp
+ * -EPERM garbage can value to catch a multitude of errors
+ * -EAGAIN management IO not permitted, state or off error
+ * -ETIME mailbox timeout
+ * -ENODEV mailbox error
+ * count number of bytes transferred
+ **/
 static ssize_t
 sysfs_mbox_read(struct kobject *kobj, struct bin_attribute *bin_attr,
                 char *buf, loff_t off, size_t count)
@@ -1954,6 +3162,8 @@ sysfs_mbox_read(struct kobject *kobj, struct bin_attribute *bin_attr,
                 case MBX_DEL_LD_ENTRY:
                 case MBX_SET_VARIABLE:
                 case MBX_WRITE_WWN:
+                case MBX_PORT_CAPABILITIES:
+                case MBX_PORT_IOV_CONTROL:
                         break;
                 case MBX_READ_SPARM64:
                 case MBX_READ_LA:
@@ -1978,17 +3188,15 @@ sysfs_mbox_read(struct kobject *kobj, struct bin_attribute *bin_attr,
                 /* If HBA encountered an error attention, allow only DUMP
                  * or RESTART mailbox commands until the HBA is restarted.
                  */
-                if ((phba->pport->stopped) &&
-                        (phba->sysfs_mbox.mbox->mb.mbxCommand !=
-                                MBX_DUMP_MEMORY &&
-                         phba->sysfs_mbox.mbox->mb.mbxCommand !=
-                                MBX_RESTART &&
-                         phba->sysfs_mbox.mbox->mb.mbxCommand !=
-                                MBX_WRITE_VPARMS)) {
-                        sysfs_mbox_idle(phba);
-                        spin_unlock_irq(&phba->hbalock);
-                        return -EPERM;
-                }
+                if (phba->pport->stopped &&
+                    phba->sysfs_mbox.mbox->mb.mbxCommand != MBX_DUMP_MEMORY &&
+                    phba->sysfs_mbox.mbox->mb.mbxCommand != MBX_RESTART &&
+                    phba->sysfs_mbox.mbox->mb.mbxCommand != MBX_WRITE_VPARMS &&
+                    phba->sysfs_mbox.mbox->mb.mbxCommand != MBX_WRITE_WWN)
+                        lpfc_printf_log(phba, KERN_WARNING, LOG_MBOX,
+                                        "1259 mbox: Issued mailbox cmd "
+                                        "0x%x while in stopped state.\n",
+                                        phba->sysfs_mbox.mbox->mb.mbxCommand);
 
                 phba->sysfs_mbox.mbox->vport = vport;
 
@@ -2059,6 +3267,14 @@ static struct bin_attribute sysfs_mbox_attr = {
         .write = sysfs_mbox_write,
 };
 
+/**
+ * lpfc_alloc_sysfs_attr: Creates the ctlreg and mbox entries.
+ * @vport: address of lpfc vport structure.
+ *
+ * Return codes:
+ * zero on success
+ * error return code from sysfs_create_bin_file()
+ **/
 int
 lpfc_alloc_sysfs_attr(struct lpfc_vport *vport)
 {
@@ -2075,18 +3291,30 @@ lpfc_alloc_sysfs_attr(struct lpfc_vport *vport)
         if (error)
                 goto out_remove_ctlreg_attr;
 
+        error = sysfs_create_bin_file(&shost->shost_dev.kobj,
+                                      &sysfs_drvr_stat_data_attr);
+        if (error)
+                goto out_remove_mbox_attr;
+
         return 0;
+out_remove_mbox_attr:
+        sysfs_remove_bin_file(&shost->shost_dev.kobj, &sysfs_mbox_attr);
 out_remove_ctlreg_attr:
         sysfs_remove_bin_file(&shost->shost_dev.kobj, &sysfs_ctlreg_attr);
 out:
         return error;
 }
 
+/**
+ * lpfc_free_sysfs_attr: Removes the ctlreg and mbox entries.
+ * @vport: address of lpfc vport structure.
+ **/
 void
 lpfc_free_sysfs_attr(struct lpfc_vport *vport)
 {
         struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
-
+        sysfs_remove_bin_file(&shost->shost_dev.kobj,
+                &sysfs_drvr_stat_data_attr);
         sysfs_remove_bin_file(&shost->shost_dev.kobj, &sysfs_mbox_attr);
         sysfs_remove_bin_file(&shost->shost_dev.kobj, &sysfs_ctlreg_attr);
 }
@@ -2096,6 +3324,10 @@ lpfc_free_sysfs_attr(struct lpfc_vport *vport)
  * Dynamic FC Host Attributes Support
  */
 
+/**
+ * lpfc_get_host_port_id: Copy the vport DID into the scsi host port id.
+ * @shost: kernel scsi host pointer.
+ **/
 static void
 lpfc_get_host_port_id(struct Scsi_Host *shost)
 {
@@ -2105,6 +3337,10 @@ lpfc_get_host_port_id(struct Scsi_Host *shost)
         fc_host_port_id(shost) = vport->fc_myDID;
 }
 
+/**
+ * lpfc_get_host_port_type: Set the value of the scsi host port type.
+ * @shost: kernel scsi host pointer.
+ **/
 static void
 lpfc_get_host_port_type(struct Scsi_Host *shost)
 {
@@ -2133,6 +3369,10 @@ lpfc_get_host_port_type(struct Scsi_Host *shost)
         spin_unlock_irq(shost->host_lock);
 }
 
+/**
+ * lpfc_get_host_port_state: Set the value of the scsi host port state.
+ * @shost: kernel scsi host pointer.
+ **/
 static void
 lpfc_get_host_port_state(struct Scsi_Host *shost)
 {
@@ -2167,6 +3407,10 @@ lpfc_get_host_port_state(struct Scsi_Host *shost)
         spin_unlock_irq(shost->host_lock);
 }
 
+/**
+ * lpfc_get_host_speed: Set the value of the scsi host speed.
+ * @shost: kernel scsi host pointer.
+ **/
 static void
 lpfc_get_host_speed(struct Scsi_Host *shost)
 {
@@ -2199,6 +3443,10 @@ lpfc_get_host_speed(struct Scsi_Host *shost)
         spin_unlock_irq(shost->host_lock);
 }
 
+/**
+ * lpfc_get_host_fabric_name: Set the value of the scsi host fabric name.
+ * @shost: kernel scsi host pointer.
+ **/
 static void
 lpfc_get_host_fabric_name (struct Scsi_Host *shost)
 {
@@ -2221,6 +3469,18 @@ lpfc_get_host_fabric_name (struct Scsi_Host *shost)
         fc_host_fabric_name(shost) = node_name;
 }
 
+/**
+ * lpfc_get_stats: Return statistical information about the adapter.
+ * @shost: kernel scsi host pointer.
+ *
+ * Notes:
+ * NULL on error for link down, no mbox pool, sli2 active,
+ * management not allowed, memory allocation error, or mbox error.
+ *
+ * Returns:
+ * NULL for error
+ * address of the adapter host statistics
+ **/
 static struct fc_host_statistics *
 lpfc_get_stats(struct Scsi_Host *shost)
 {
@@ -2334,6 +3594,10 @@ lpfc_get_stats(struct Scsi_Host *shost)
         return hs;
 }
 
+/**
+ * lpfc_reset_stats: Copy the adapter link stats information.
+ * @shost: kernel scsi host pointer.
+ **/
 static void
 lpfc_reset_stats(struct Scsi_Host *shost)
 {
@@ -2411,6 +3675,14 @@ lpfc_reset_stats(struct Scsi_Host *shost)
  * are no sysfs handlers for link_down_tmo.
  */
 
+/**
+ * lpfc_get_node_by_target: Return the nodelist for a target.
+ * @starget: kernel scsi target pointer.
+ *
+ * Returns:
+ * address of the node list if found
+ * NULL target not found
+ **/
 static struct lpfc_nodelist *
 lpfc_get_node_by_target(struct scsi_target *starget)
 {
@@ -2432,6 +3704,10 @@ lpfc_get_node_by_target(struct scsi_target *starget)
         return NULL;
 }
 
+/**
+ * lpfc_get_starget_port_id: Set the target port id to the ndlp DID or -1.
+ * @starget: kernel scsi target pointer.
+ **/
 static void
 lpfc_get_starget_port_id(struct scsi_target *starget)
 {
@@ -2440,6 +3716,12 @@ lpfc_get_starget_port_id(struct scsi_target *starget)
         fc_starget_port_id(starget) = ndlp ? ndlp->nlp_DID : -1;
 }
 
+/**
+ * lpfc_get_starget_node_name: Set the target node name.
+ * @starget: kernel scsi target pointer.
+ *
+ * Description: Set the target node name to the ndlp node name wwn or zero.
+ **/
 static void
 lpfc_get_starget_node_name(struct scsi_target *starget)
 {
@@ -2449,6 +3731,12 @@ lpfc_get_starget_node_name(struct scsi_target *starget)
                 ndlp ? wwn_to_u64(ndlp->nlp_nodename.u.wwn) : 0;
 }
 
+/**
+ * lpfc_get_starget_port_name: Set the target port name.
+ * @starget: kernel scsi target pointer.
+ *
+ * Description:  set the target port name to the ndlp port name wwn or zero.
+ **/
 static void
 lpfc_get_starget_port_name(struct scsi_target *starget)
 {
@@ -2458,6 +3746,15 @@ lpfc_get_starget_port_name(struct scsi_target *starget)
                 ndlp ? wwn_to_u64(ndlp->nlp_portname.u.wwn) : 0;
 }
 
+/**
+ * lpfc_set_rport_loss_tmo: Set the rport dev loss tmo.
+ * @rport: fc rport address.
+ * @timeout: new value for dev loss tmo.
+ *
+ * Description:
+ * If timeout is non zero set the dev_loss_tmo to timeout, else set
+ * dev_loss_tmo to one.
+ **/
 static void
 lpfc_set_rport_loss_tmo(struct fc_rport *rport, uint32_t timeout)
 {
@@ -2467,7 +3764,18 @@ lpfc_set_rport_loss_tmo(struct fc_rport *rport, uint32_t timeout)
                 rport->dev_loss_tmo = 1;
 }
 
-
+/**
+ * lpfc_rport_show_function: Return rport target information.
+ *
+ * Description:
+ * Macro that uses field to generate a function with the name lpfc_show_rport_
+ *
+ * lpfc_show_rport_##field: returns the bytes formatted in buf
+ * @cdev: class converted to an fc_rport.
+ * @buf: on return contains the target_field or zero.
+ *
+ * Returns: size of formatted string.
+ **/
 #define lpfc_rport_show_function(field, format_string, sz, cast)        \
 static ssize_t                                                          \
 lpfc_show_rport_##field (struct device *dev,                            \
@@ -2602,6 +3910,10 @@ struct fc_function_template lpfc_vport_transport_functions = {
         .vport_disable = lpfc_vport_disable,
 };
 
+/**
+ * lpfc_get_cfgparam: Used during probe_one to init the adapter structure.
+ * @phba: lpfc_hba pointer.
+ **/
 void
 lpfc_get_cfgparam(struct lpfc_hba *phba)
 {
@@ -2637,6 +3949,10 @@ lpfc_get_cfgparam(struct lpfc_hba *phba)
         return;
 }
 
+/**
+ * lpfc_get_vport_cfgparam: Used during port create, init the vport structure.
+ * @vport: lpfc_vport pointer.
+ **/
 void
 lpfc_get_vport_cfgparam(struct lpfc_vport *vport)
 {
@@ -2648,6 +3964,7 @@ lpfc_get_vport_cfgparam(struct lpfc_vport *vport)
         lpfc_restrict_login_init(vport, lpfc_restrict_login);
         lpfc_fcp_class_init(vport, lpfc_fcp_class);
         lpfc_use_adisc_init(vport, lpfc_use_adisc);
+        lpfc_max_scsicmpl_time_init(vport, lpfc_max_scsicmpl_time);
         lpfc_fdmi_on_init(vport, lpfc_fdmi_on);
         lpfc_discovery_threads_init(vport, lpfc_discovery_threads);
         lpfc_max_luns_init(vport, lpfc_max_luns);
diff --git a/drivers/scsi/lpfc/lpfc_crtn.h b/drivers/scsi/lpfc/lpfc_crtn.h
index 1b8245213b83..044ef4057d28 100644
--- a/drivers/scsi/lpfc/lpfc_crtn.h
+++ b/drivers/scsi/lpfc/lpfc_crtn.h
@@ -18,7 +18,7 @@
  * included with this package.                                     *
  *******************************************************************/
 
-typedef int (*node_filter)(struct lpfc_nodelist *ndlp, void *param);
+typedef int (*node_filter)(struct lpfc_nodelist *, void *);
 
 struct fc_rport;
 void lpfc_dump_mem(struct lpfc_hba *, LPFC_MBOXQ_t *, uint16_t);
@@ -26,11 +26,11 @@ void lpfc_read_nv(struct lpfc_hba *, LPFC_MBOXQ_t *);
 void lpfc_config_async(struct lpfc_hba *, LPFC_MBOXQ_t *, uint32_t);
 
 void lpfc_heart_beat(struct lpfc_hba *, LPFC_MBOXQ_t *);
-int lpfc_read_la(struct lpfc_hba * phba, LPFC_MBOXQ_t * pmb,
-                 struct lpfc_dmabuf *mp);
+int lpfc_read_la(struct lpfc_hba *, LPFC_MBOXQ_t *, struct lpfc_dmabuf *);
 void lpfc_clear_la(struct lpfc_hba *, LPFC_MBOXQ_t *);
-void lpfc_issue_clear_la(struct lpfc_hba *phba, struct lpfc_vport *vport);
+void lpfc_issue_clear_la(struct lpfc_hba *, struct lpfc_vport *);
 void lpfc_config_link(struct lpfc_hba *, LPFC_MBOXQ_t *);
+int lpfc_config_msi(struct lpfc_hba *, LPFC_MBOXQ_t *);
 int lpfc_read_sparam(struct lpfc_hba *, LPFC_MBOXQ_t *, int);
 void lpfc_read_config(struct lpfc_hba *, LPFC_MBOXQ_t *);
 void lpfc_read_lnk_stat(struct lpfc_hba *, LPFC_MBOXQ_t *);
@@ -43,7 +43,7 @@ void lpfc_unreg_vpi(struct lpfc_hba *, uint16_t, LPFC_MBOXQ_t *);
 void lpfc_init_link(struct lpfc_hba *, LPFC_MBOXQ_t *, uint32_t, uint32_t);
 
 struct lpfc_vport *lpfc_find_vport_by_did(struct lpfc_hba *, uint32_t);
-void lpfc_cleanup_rpis(struct lpfc_vport *vport, int remove);
+void lpfc_cleanup_rpis(struct lpfc_vport *, int);
 int lpfc_linkdown(struct lpfc_hba *);
 void lpfc_port_link_failure(struct lpfc_vport *);
 void lpfc_mbx_cmpl_read_la(struct lpfc_hba *, LPFC_MBOXQ_t *);
@@ -135,7 +135,7 @@ void lpfc_ct_unsol_event(struct lpfc_hba *, struct lpfc_sli_ring *,
 int lpfc_ns_cmd(struct lpfc_vport *, int, uint8_t, uint32_t);
 int lpfc_fdmi_cmd(struct lpfc_vport *, struct lpfc_nodelist *, int);
 void lpfc_fdmi_tmo(unsigned long);
-void lpfc_fdmi_timeout_handler(struct lpfc_vport *vport);
+void lpfc_fdmi_timeout_handler(struct lpfc_vport *);
 
 int lpfc_config_port_prep(struct lpfc_hba *);
 int lpfc_config_port_post(struct lpfc_hba *);
@@ -155,6 +155,8 @@ int lpfc_sli_queue_setup(struct lpfc_hba *);
 void lpfc_handle_eratt(struct lpfc_hba *);
 void lpfc_handle_latt(struct lpfc_hba *);
 irqreturn_t lpfc_intr_handler(int, void *);
+irqreturn_t lpfc_sp_intr_handler(int, void *);
+irqreturn_t lpfc_fp_intr_handler(int, void *);
 
 void lpfc_read_rev(struct lpfc_hba *, LPFC_MBOXQ_t *);
 void lpfc_config_ring(struct lpfc_hba *, int, LPFC_MBOXQ_t *);
@@ -175,11 +177,12 @@ void lpfc_mem_free(struct lpfc_hba *);
 void lpfc_stop_vport_timers(struct lpfc_vport *);
 
 void lpfc_poll_timeout(unsigned long ptr);
-void lpfc_poll_start_timer(struct lpfc_hba * phba);
-void lpfc_sli_poll_fcp_ring(struct lpfc_hba * hba);
+void lpfc_poll_start_timer(struct lpfc_hba *);
+void lpfc_poll_eratt(unsigned long);
+void lpfc_sli_poll_fcp_ring(struct lpfc_hba *);
 struct lpfc_iocbq * lpfc_sli_get_iocbq(struct lpfc_hba *);
-void lpfc_sli_release_iocbq(struct lpfc_hba * phba, struct lpfc_iocbq * iocb);
-uint16_t lpfc_sli_next_iotag(struct lpfc_hba * phba, struct lpfc_iocbq * iocb);
+void lpfc_sli_release_iocbq(struct lpfc_hba *, struct lpfc_iocbq *);
+uint16_t lpfc_sli_next_iotag(struct lpfc_hba *, struct lpfc_iocbq *);
 
 void lpfc_reset_barrier(struct lpfc_hba * phba);
 int lpfc_sli_brdready(struct lpfc_hba *, uint32_t);
@@ -187,11 +190,13 @@ int lpfc_sli_brdkill(struct lpfc_hba *);
 int lpfc_sli_brdreset(struct lpfc_hba *);
 int lpfc_sli_brdrestart(struct lpfc_hba *);
 int lpfc_sli_hba_setup(struct lpfc_hba *);
+int lpfc_sli_config_port(struct lpfc_hba *, int);
 int lpfc_sli_host_down(struct lpfc_vport *);
 int lpfc_sli_hba_down(struct lpfc_hba *);
 int lpfc_sli_issue_mbox(struct lpfc_hba *, LPFC_MBOXQ_t *, uint32_t);
 int lpfc_sli_handle_mb_event(struct lpfc_hba *);
 int lpfc_sli_flush_mbox_queue(struct lpfc_hba *);
+int lpfc_sli_check_eratt(struct lpfc_hba *);
 int lpfc_sli_handle_slow_ring_event(struct lpfc_hba *,
                                     struct lpfc_sli_ring *, uint32_t);
 void lpfc_sli_def_mbox_cmpl(struct lpfc_hba *, LPFC_MBOXQ_t *);
@@ -199,6 +204,7 @@ int lpfc_sli_issue_iocb(struct lpfc_hba *, struct lpfc_sli_ring *,
                         struct lpfc_iocbq *, uint32_t);
 void lpfc_sli_pcimem_bcopy(void *, void *, uint32_t);
 void lpfc_sli_abort_iocb_ring(struct lpfc_hba *, struct lpfc_sli_ring *);
+void lpfc_sli_flush_fcp_rings(struct lpfc_hba *);
 int lpfc_sli_ringpostbuf_put(struct lpfc_hba *, struct lpfc_sli_ring *,
                              struct lpfc_dmabuf *);
 struct lpfc_dmabuf *lpfc_sli_ringpostbuf_get(struct lpfc_hba *,
@@ -226,17 +232,13 @@ struct lpfc_nodelist *lpfc_findnode_did(struct lpfc_vport *, uint32_t);
 struct lpfc_nodelist *lpfc_findnode_wwpn(struct lpfc_vport *,
                                          struct lpfc_name *);
 
-int lpfc_sli_issue_mbox_wait(struct lpfc_hba * phba, LPFC_MBOXQ_t * pmboxq,
-                             uint32_t timeout);
+int lpfc_sli_issue_mbox_wait(struct lpfc_hba *, LPFC_MBOXQ_t *, uint32_t);
 
-int lpfc_sli_issue_iocb_wait(struct lpfc_hba * phba,
-                             struct lpfc_sli_ring * pring,
-                             struct lpfc_iocbq * piocb,
-                             struct lpfc_iocbq * prspiocbq,
-                             uint32_t timeout);
-void lpfc_sli_abort_fcp_cmpl(struct lpfc_hba * phba,
-                             struct lpfc_iocbq * cmdiocb,
-                             struct lpfc_iocbq * rspiocb);
+int lpfc_sli_issue_iocb_wait(struct lpfc_hba *, struct lpfc_sli_ring *,
+                             struct lpfc_iocbq *, struct lpfc_iocbq *,
+                             uint32_t);
+void lpfc_sli_abort_fcp_cmpl(struct lpfc_hba *, struct lpfc_iocbq *,
+                             struct lpfc_iocbq *);
 
 void lpfc_sli_free_hbq(struct lpfc_hba *, struct hbq_dmabuf *);
 
@@ -269,7 +271,7 @@ void lpfc_dev_loss_tmo_callbk(struct fc_rport *rport);
 
 struct lpfc_vport *lpfc_create_port(struct lpfc_hba *, int, struct device *);
 int  lpfc_vport_disable(struct fc_vport *fc_vport, bool disable);
-void lpfc_mbx_unreg_vpi(struct lpfc_vport *);
+int lpfc_mbx_unreg_vpi(struct lpfc_vport *);
 void destroy_port(struct lpfc_vport *);
 int lpfc_get_instance(void);
 void lpfc_host_attrib_init(struct Scsi_Host *);
@@ -290,6 +292,13 @@ void lpfc_unblock_fabric_iocbs(struct lpfc_hba *);
 void lpfc_adjust_queue_depth(struct lpfc_hba *);
 void lpfc_ramp_down_queue_handler(struct lpfc_hba *);
 void lpfc_ramp_up_queue_handler(struct lpfc_hba *);
+void lpfc_scsi_dev_block(struct lpfc_hba *);
+
+void
+lpfc_send_els_failure_event(struct lpfc_hba *, struct lpfc_iocbq *,
+                                struct lpfc_iocbq *);
+struct lpfc_fast_path_event *lpfc_alloc_fast_evt(struct lpfc_hba *);
+void lpfc_free_fast_evt(struct lpfc_hba *, struct lpfc_fast_path_event *);
 
 #define ScsiResult(host_code, scsi_code) (((host_code) << 16) | scsi_code)
 #define HBA_EVENT_RSCN                   5
diff --git a/drivers/scsi/lpfc/lpfc_ct.c b/drivers/scsi/lpfc/lpfc_ct.c
index 7fc74cf5823b..26dae8bae2d1 100644
--- a/drivers/scsi/lpfc/lpfc_ct.c
+++ b/drivers/scsi/lpfc/lpfc_ct.c
@@ -34,6 +34,7 @@
 
 #include "lpfc_hw.h"
 #include "lpfc_sli.h"
+#include "lpfc_nl.h"
 #include "lpfc_disc.h"
 #include "lpfc_scsi.h"
 #include "lpfc.h"
@@ -134,25 +135,24 @@ lpfc_ct_unsol_event(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                 }
                 list_del(&head);
         } else {
-                struct lpfc_iocbq  *next;
-
-                list_for_each_entry_safe(iocbq, next, &piocbq->list, list) {
+                INIT_LIST_HEAD(&head);
+                list_add_tail(&head, &piocbq->list);
+                list_for_each_entry(iocbq, &head, list) {
                         icmd = &iocbq->iocb;
                         if (icmd->ulpBdeCount == 0)
-                                lpfc_ct_unsol_buffer(phba, piocbq, NULL, 0);
+                                lpfc_ct_unsol_buffer(phba, iocbq, NULL, 0);
                         for (i = 0; i < icmd->ulpBdeCount; i++) {
                                 paddr = getPaddr(icmd->un.cont64[i].addrHigh,
                                                  icmd->un.cont64[i].addrLow);
                                 mp = lpfc_sli_ringpostbuf_get(phba, pring,
                                                               paddr);
                                 size = icmd->un.cont64[i].tus.f.bdeSize;
-                                lpfc_ct_unsol_buffer(phba, piocbq, mp, size);
+                                lpfc_ct_unsol_buffer(phba, iocbq, mp, size);
                                 lpfc_in_buf_free(phba, mp);
                         }
-                        list_del(&iocbq->list);
-                        lpfc_sli_release_iocbq(phba, iocbq);
                         lpfc_post_buffer(phba, pring, i);
                 }
+                list_del(&head);
         }
 }
 
@@ -212,7 +212,7 @@ lpfc_alloc_ct_rsp(struct lpfc_hba *phba, int cmdcode, struct ulp_bde64 *bpl,
                 else
                         list_add_tail(&mp->list, &mlist->list);
 
-                bpl->tus.f.bdeFlags = BUFF_USE_RCV;
+                bpl->tus.f.bdeFlags = BUFF_TYPE_BDE_64I;
                 /* build buffer ptr list for IOCB */
                 bpl->addrLow = le32_to_cpu(putPaddrLow(mp->phys) );
                 bpl->addrHigh = le32_to_cpu(putPaddrHigh(mp->phys) );
@@ -283,7 +283,7 @@ lpfc_gen_req(struct lpfc_vport *vport, struct lpfc_dmabuf *bmp,
         icmd->un.genreq64.bdl.ulpIoTag32 = 0;
         icmd->un.genreq64.bdl.addrHigh = putPaddrHigh(bmp->phys);
         icmd->un.genreq64.bdl.addrLow = putPaddrLow(bmp->phys);
-        icmd->un.genreq64.bdl.bdeFlags = BUFF_TYPE_BDL;
+        icmd->un.genreq64.bdl.bdeFlags = BUFF_TYPE_BLP_64;
         icmd->un.genreq64.bdl.bdeSize = (num_entry * sizeof (struct ulp_bde64));
 
         if (usr_flg)
@@ -861,7 +861,7 @@ lpfc_cmpl_ct(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
 
                 retry++;
                 lpfc_printf_vlog(vport, KERN_INFO, LOG_DISCOVERY,
-                                 "0216 Retrying NS cmd %x\n", cmdcode);
+                                 "0250 Retrying NS cmd %x\n", cmdcode);
                 rc = lpfc_ns_cmd(vport, cmdcode, retry, 0);
                 if (rc == 0)
                         goto out;
diff --git a/drivers/scsi/lpfc/lpfc_debugfs.c b/drivers/scsi/lpfc/lpfc_debugfs.c
index 094b47e94b29..771920bdde44 100644
--- a/drivers/scsi/lpfc/lpfc_debugfs.c
+++ b/drivers/scsi/lpfc/lpfc_debugfs.c
@@ -1,7 +1,7 @@
 /*******************************************************************
  * This file is part of the Emulex Linux Device Driver for         *
  * Fibre Channel Host Bus Adapters.                                *
- * Copyright (C) 2007 Emulex.  All rights reserved.                *
+ * Copyright (C) 2007-2008 Emulex.  All rights reserved.           *
  * EMULEX and SLI are trademarks of Emulex.                        *
  * www.emulex.com                                                  *
  *                                                                 *
@@ -35,6 +35,7 @@
 
 #include "lpfc_hw.h"
 #include "lpfc_sli.h"
+#include "lpfc_nl.h"
 #include "lpfc_disc.h"
 #include "lpfc_scsi.h"
 #include "lpfc.h"
@@ -46,13 +47,14 @@
 #include "lpfc_debugfs.h"
 
 #ifdef CONFIG_LPFC_DEBUG_FS
-/* debugfs interface
+/**
+ * debugfs interface
  *
  * To access this interface the user should:
  * # mkdir /debug
  * # mount -t debugfs none /debug
  *
- * The lpfc debugfs directory hierachy is:
+ * The lpfc debugfs directory hierarchy is:
  * lpfc/lpfcX/vportY
  * where X is the lpfc hba unique_id
  * where Y is the vport VPI on that hba
@@ -61,14 +63,21 @@
  * discovery_trace
  * This is an ACSII readable file that contains a trace of the last
  * lpfc_debugfs_max_disc_trc events that happened on a specific vport.
- * See lpfc_debugfs.h for different categories of
- * discovery events. To enable the discovery trace, the following
- * module parameters must be set:
+ * See lpfc_debugfs.h for different categories of  discovery events.
+ * To enable the discovery trace, the following module parameters must be set:
  * lpfc_debugfs_enable=1         Turns on lpfc debugfs filesystem support
  * lpfc_debugfs_max_disc_trc=X   Where X is the event trace depth for
  *                               EACH vport. X MUST also be a power of 2.
  * lpfc_debugfs_mask_disc_trc=Y  Where Y is an event mask as defined in
  *                               lpfc_debugfs.h .
+ *
+ * slow_ring_trace
+ * This is an ACSII readable file that contains a trace of the last
+ * lpfc_debugfs_max_slow_ring_trc events that happened on a specific HBA.
+ * To enable the slow ring trace, the following module parameters must be set:
+ * lpfc_debugfs_enable=1         Turns on lpfc debugfs filesystem support
+ * lpfc_debugfs_max_slow_ring_trc=X   Where X is the event trace depth for
+ *                               the HBA. X MUST also be a power of 2.
  */
 static int lpfc_debugfs_enable = 1;
 module_param(lpfc_debugfs_enable, int, 0);
@@ -117,6 +126,25 @@ struct lpfc_debug {
 static atomic_t lpfc_debugfs_seq_trc_cnt = ATOMIC_INIT(0);
 static unsigned long lpfc_debugfs_start_time = 0L;
 
+/**
+ * lpfc_debugfs_disc_trc_data - Dump discovery logging to a buffer.
+ * @vport: The vport to gather the log info from.
+ * @buf: The buffer to dump log into.
+ * @size: The maximum amount of data to process.
+ *
+ * Description:
+ * This routine gathers the lpfc discovery debugfs data from the @vport and
+ * dumps it to @buf up to @size number of bytes. It will start at the next entry
+ * in the log and process the log until the end of the buffer. Then it will
+ * gather from the beginning of the log and process until the current entry.
+ *
+ * Notes:
+ * Discovery logging will be disabled while while this routine dumps the log.
+ *
+ * Return Value:
+ * This routine returns the amount of bytes that were dumped into @buf and will
+ * not exceed @size.
+ **/
 static int
 lpfc_debugfs_disc_trc_data(struct lpfc_vport *vport, char *buf, int size)
 {
@@ -125,7 +153,6 @@ lpfc_debugfs_disc_trc_data(struct lpfc_vport *vport, char *buf, int size)
         struct lpfc_debugfs_trc *dtp;
         char buffer[LPFC_DEBUG_TRC_ENTRY_SIZE];
 
-
         enable = lpfc_debugfs_enable;
         lpfc_debugfs_enable = 0;
 
@@ -159,6 +186,25 @@ lpfc_debugfs_disc_trc_data(struct lpfc_vport *vport, char *buf, int size)
         return len;
 }
 
+/**
+ * lpfc_debugfs_slow_ring_trc_data - Dump slow ring logging to a buffer.
+ * @phba: The HBA to gather the log info from.
+ * @buf: The buffer to dump log into.
+ * @size: The maximum amount of data to process.
+ *
+ * Description:
+ * This routine gathers the lpfc slow ring debugfs data from the @phba and
+ * dumps it to @buf up to @size number of bytes. It will start at the next entry
+ * in the log and process the log until the end of the buffer. Then it will
+ * gather from the beginning of the log and process until the current entry.
+ *
+ * Notes:
+ * Slow ring logging will be disabled while while this routine dumps the log.
+ *
+ * Return Value:
+ * This routine returns the amount of bytes that were dumped into @buf and will
+ * not exceed @size.
+ **/
 static int
 lpfc_debugfs_slow_ring_trc_data(struct lpfc_hba *phba, char *buf, int size)
 {
@@ -203,6 +249,25 @@ lpfc_debugfs_slow_ring_trc_data(struct lpfc_hba *phba, char *buf, int size)
 
 static int lpfc_debugfs_last_hbq = -1;
 
+/**
+ * lpfc_debugfs_hbqinfo_data - Dump host buffer queue info to a buffer.
+ * @phba: The HBA to gather host buffer info from.
+ * @buf: The buffer to dump log into.
+ * @size: The maximum amount of data to process.
+ *
+ * Description:
+ * This routine dumps the host buffer queue info from the @phba to @buf up to
+ * @size number of bytes. A header that describes the current hbq state will be
+ * dumped to @buf first and then info on each hbq entry will be dumped to @buf
+ * until @size bytes have been dumped or all the hbq info has been dumped.
+ *
+ * Notes:
+ * This routine will rotate through each configured HBQ each time called.
+ *
+ * Return Value:
+ * This routine returns the amount of bytes that were dumped into @buf and will
+ * not exceed @size.
+ **/
 static int
 lpfc_debugfs_hbqinfo_data(struct lpfc_hba *phba, char *buf, int size)
 {
@@ -303,6 +368,24 @@ skipit:
 
 static int lpfc_debugfs_last_hba_slim_off;
 
+/**
+ * lpfc_debugfs_dumpHBASlim_data - Dump HBA SLIM info to a buffer.
+ * @phba: The HBA to gather SLIM info from.
+ * @buf: The buffer to dump log into.
+ * @size: The maximum amount of data to process.
+ *
+ * Description:
+ * This routine dumps the current contents of HBA SLIM for the HBA associated
+ * with @phba to @buf up to @size bytes of data. This is the raw HBA SLIM data.
+ *
+ * Notes:
+ * This routine will only dump up to 1024 bytes of data each time called and
+ * should be called multiple times to dump the entire HBA SLIM.
+ *
+ * Return Value:
+ * This routine returns the amount of bytes that were dumped into @buf and will
+ * not exceed @size.
+ **/
 static int
 lpfc_debugfs_dumpHBASlim_data(struct lpfc_hba *phba, char *buf, int size)
 {
@@ -342,6 +425,21 @@ lpfc_debugfs_dumpHBASlim_data(struct lpfc_hba *phba, char *buf, int size)
         return len;
 }
 
+/**
+ * lpfc_debugfs_dumpHostSlim_data - Dump host SLIM info to a buffer.
+ * @phba: The HBA to gather Host SLIM info from.
+ * @buf: The buffer to dump log into.
+ * @size: The maximum amount of data to process.
+ *
+ * Description:
+ * This routine dumps the current contents of host SLIM for the host associated
+ * with @phba to @buf up to @size bytes of data. The dump will contain the
+ * Mailbox, PCB, Rings, and Registers that are located in host memory.
+ *
+ * Return Value:
+ * This routine returns the amount of bytes that were dumped into @buf and will
+ * not exceed @size.
+ **/
 static int
 lpfc_debugfs_dumpHostSlim_data(struct lpfc_hba *phba, char *buf, int size)
 {
@@ -357,7 +455,7 @@ lpfc_debugfs_dumpHostSlim_data(struct lpfc_hba *phba, char *buf, int size)
         spin_lock_irq(&phba->hbalock);
 
         len +=  snprintf(buf+len, size-len, "SLIM Mailbox\n");
-        ptr = (uint32_t *)phba->slim2p;
+        ptr = (uint32_t *)phba->slim2p.virt;
         i = sizeof(MAILBOX_t);
         while (i > 0) {
                 len +=  snprintf(buf+len, size-len,
@@ -370,7 +468,7 @@ lpfc_debugfs_dumpHostSlim_data(struct lpfc_hba *phba, char *buf, int size)
         }
 
         len +=  snprintf(buf+len, size-len, "SLIM PCB\n");
-        ptr = (uint32_t *)&phba->slim2p->pcb;
+        ptr = (uint32_t *)phba->pcb;
         i = sizeof(PCB_t);
         while (i > 0) {
                 len +=  snprintf(buf+len, size-len,
@@ -382,44 +480,16 @@ lpfc_debugfs_dumpHostSlim_data(struct lpfc_hba *phba, char *buf, int size)
                 off += (8 * sizeof(uint32_t));
         }
 
-        pgpp = (struct lpfc_pgp *)&phba->slim2p->mbx.us.s3_pgp.port;
-        pring = &psli->ring[0];
-        len +=  snprintf(buf+len, size-len,
-                "Ring 0: CMD GetInx:%d (Max:%d Next:%d Local:%d flg:x%x)  "
-                "RSP PutInx:%d Max:%d\n",
-                pgpp->cmdGetInx, pring->numCiocb,
-                pring->next_cmdidx, pring->local_getidx, pring->flag,
-                pgpp->rspPutInx, pring->numRiocb);
-        pgpp++;
-
-        pring = &psli->ring[1];
-        len +=  snprintf(buf+len, size-len,
-                "Ring 1: CMD GetInx:%d (Max:%d Next:%d Local:%d flg:x%x)  "
-                "RSP PutInx:%d Max:%d\n",
-                pgpp->cmdGetInx, pring->numCiocb,
-                pring->next_cmdidx, pring->local_getidx, pring->flag,
-                pgpp->rspPutInx, pring->numRiocb);
-        pgpp++;
-
-        pring = &psli->ring[2];
-        len +=  snprintf(buf+len, size-len,
-                "Ring 2: CMD GetInx:%d (Max:%d Next:%d Local:%d flg:x%x)  "
-                "RSP PutInx:%d Max:%d\n",
-                pgpp->cmdGetInx, pring->numCiocb,
-                pring->next_cmdidx, pring->local_getidx, pring->flag,
-                pgpp->rspPutInx, pring->numRiocb);
-        pgpp++;
-
-        pring = &psli->ring[3];
-        len +=  snprintf(buf+len, size-len,
-                "Ring 3: CMD GetInx:%d (Max:%d Next:%d Local:%d flg:x%x)  "
-                "RSP PutInx:%d Max:%d\n",
-                pgpp->cmdGetInx, pring->numCiocb,
-                pring->next_cmdidx, pring->local_getidx, pring->flag,
-                pgpp->rspPutInx, pring->numRiocb);
-
-
-        ptr = (uint32_t *)&phba->slim2p->mbx.us.s3_pgp.hbq_get;
+        for (i = 0; i < 4; i++) {
+                pgpp = &phba->port_gp[i];
+                pring = &psli->ring[i];
+                len +=  snprintf(buf+len, size-len,
+                                 "Ring %d: CMD GetInx:%d (Max:%d Next:%d "
+                                 "Local:%d flg:x%x)  RSP PutInx:%d Max:%d\n",
+                                 i, pgpp->cmdGetInx, pring->numCiocb,
+                                 pring->next_cmdidx, pring->local_getidx,
+                                 pring->flag, pgpp->rspPutInx, pring->numRiocb);
+        }
         word0 = readl(phba->HAregaddr);
         word1 = readl(phba->CAregaddr);
         word2 = readl(phba->HSregaddr);
@@ -430,6 +500,21 @@ lpfc_debugfs_dumpHostSlim_data(struct lpfc_hba *phba, char *buf, int size)
         return len;
 }
 
+/**
+ * lpfc_debugfs_nodelist_data - Dump target node list to a buffer.
+ * @vport: The vport to gather target node info from.
+ * @buf: The buffer to dump log into.
+ * @size: The maximum amount of data to process.
+ *
+ * Description:
+ * This routine dumps the current target node list associated with @vport to
+ * @buf up to @size bytes of data. Each node entry in the dump will contain a
+ * node state, DID, WWPN, WWNN, RPI, flags, type, and other useful fields.
+ *
+ * Return Value:
+ * This routine returns the amount of bytes that were dumped into @buf and will
+ * not exceed @size.
+ **/
 static int
 lpfc_debugfs_nodelist_data(struct lpfc_vport *vport, char *buf, int size)
 {
@@ -513,7 +598,22 @@ lpfc_debugfs_nodelist_data(struct lpfc_vport *vport, char *buf, int size)
 }
 #endif
 
-
+/**
+ * lpfc_debugfs_disc_trc - Store discovery trace log.
+ * @vport: The vport to associate this trace string with for retrieval.
+ * @mask: Log entry classification.
+ * @fmt: Format string to be displayed when dumping the log.
+ * @data1: 1st data parameter to be applied to @fmt.
+ * @data2: 2nd data parameter to be applied to @fmt.
+ * @data3: 3rd data parameter to be applied to @fmt.
+ *
+ * Description:
+ * This routine is used by the driver code to add a debugfs log entry to the
+ * discovery trace buffer associated with @vport. Only entries with a @mask that
+ * match the current debugfs discovery mask will be saved. Entries that do not
+ * match will be thrown away. @fmt, @data1, @data2, and @data3 are used like
+ * printf when displaying the log.
+ **/
 inline void
 lpfc_debugfs_disc_trc(struct lpfc_vport *vport, int mask, char *fmt,
         uint32_t data1, uint32_t data2, uint32_t data3)
@@ -542,6 +642,19 @@ lpfc_debugfs_disc_trc(struct lpfc_vport *vport, int mask, char *fmt,
         return;
 }
 
+/**
+ * lpfc_debugfs_slow_ring_trc - Store slow ring trace log.
+ * @phba: The phba to associate this trace string with for retrieval.
+ * @fmt: Format string to be displayed when dumping the log.
+ * @data1: 1st data parameter to be applied to @fmt.
+ * @data2: 2nd data parameter to be applied to @fmt.
+ * @data3: 3rd data parameter to be applied to @fmt.
+ *
+ * Description:
+ * This routine is used by the driver code to add a debugfs log entry to the
+ * discovery trace buffer associated with @vport. @fmt, @data1, @data2, and
+ * @data3 are used like printf when displaying the log.
+ **/
 inline void
 lpfc_debugfs_slow_ring_trc(struct lpfc_hba *phba, char *fmt,
         uint32_t data1, uint32_t data2, uint32_t data3)
@@ -568,6 +681,21 @@ lpfc_debugfs_slow_ring_trc(struct lpfc_hba *phba, char *fmt,
 }
 
 #ifdef CONFIG_LPFC_DEBUG_FS
+/**
+ * lpfc_debugfs_disc_trc_open - Open the discovery trace log.
+ * @inode: The inode pointer that contains a vport pointer.
+ * @file: The file pointer to attach the log output.
+ *
+ * Description:
+ * This routine is the entry point for the debugfs open file operation. It gets
+ * the vport from the i_private field in @inode, allocates the necessary buffer
+ * for the log, fills the buffer from the in-memory log for this vport, and then
+ * returns a pointer to that log in the private_data field in @file.
+ *
+ * Returns:
+ * This function returns zero if successful. On error it will return an negative
+ * error value.
+ **/
 static int
 lpfc_debugfs_disc_trc_open(struct inode *inode, struct file *file)
 {
@@ -585,7 +713,7 @@ lpfc_debugfs_disc_trc_open(struct inode *inode, struct file *file)
         if (!debug)
                 goto out;
 
-        /* Round to page boundry */
+        /* Round to page boundary */
         size =  (lpfc_debugfs_max_disc_trc * LPFC_DEBUG_TRC_ENTRY_SIZE);
         size = PAGE_ALIGN(size);
 
@@ -603,6 +731,21 @@ out:
         return rc;
 }
 
+/**
+ * lpfc_debugfs_slow_ring_trc_open - Open the Slow Ring trace log.
+ * @inode: The inode pointer that contains a vport pointer.
+ * @file: The file pointer to attach the log output.
+ *
+ * Description:
+ * This routine is the entry point for the debugfs open file operation. It gets
+ * the vport from the i_private field in @inode, allocates the necessary buffer
+ * for the log, fills the buffer from the in-memory log for this vport, and then
+ * returns a pointer to that log in the private_data field in @file.
+ *
+ * Returns:
+ * This function returns zero if successful. On error it will return an negative
+ * error value.
+ **/
 static int
 lpfc_debugfs_slow_ring_trc_open(struct inode *inode, struct file *file)
 {
@@ -620,7 +763,7 @@ lpfc_debugfs_slow_ring_trc_open(struct inode *inode, struct file *file)
         if (!debug)
                 goto out;
 
-        /* Round to page boundry */
+        /* Round to page boundary */
         size =  (lpfc_debugfs_max_slow_ring_trc * LPFC_DEBUG_TRC_ENTRY_SIZE);
         size = PAGE_ALIGN(size);
 
@@ -638,6 +781,21 @@ out:
         return rc;
 }
 
+/**
+ * lpfc_debugfs_hbqinfo_open - Open the hbqinfo debugfs buffer.
+ * @inode: The inode pointer that contains a vport pointer.
+ * @file: The file pointer to attach the log output.
+ *
+ * Description:
+ * This routine is the entry point for the debugfs open file operation. It gets
+ * the vport from the i_private field in @inode, allocates the necessary buffer
+ * for the log, fills the buffer from the in-memory log for this vport, and then
+ * returns a pointer to that log in the private_data field in @file.
+ *
+ * Returns:
+ * This function returns zero if successful. On error it will return an negative
+ * error value.
+ **/
 static int
 lpfc_debugfs_hbqinfo_open(struct inode *inode, struct file *file)
 {
@@ -649,7 +807,7 @@ lpfc_debugfs_hbqinfo_open(struct inode *inode, struct file *file)
         if (!debug)
                 goto out;
 
-        /* Round to page boundry */
+        /* Round to page boundary */
         debug->buffer = kmalloc(LPFC_HBQINFO_SIZE, GFP_KERNEL);
         if (!debug->buffer) {
                 kfree(debug);
@@ -665,6 +823,21 @@ out:
         return rc;
 }
 
+/**
+ * lpfc_debugfs_dumpHBASlim_open - Open the Dump HBA SLIM debugfs buffer.
+ * @inode: The inode pointer that contains a vport pointer.
+ * @file: The file pointer to attach the log output.
+ *
+ * Description:
+ * This routine is the entry point for the debugfs open file operation. It gets
+ * the vport from the i_private field in @inode, allocates the necessary buffer
+ * for the log, fills the buffer from the in-memory log for this vport, and then
+ * returns a pointer to that log in the private_data field in @file.
+ *
+ * Returns:
+ * This function returns zero if successful. On error it will return an negative
+ * error value.
+ **/
 static int
 lpfc_debugfs_dumpHBASlim_open(struct inode *inode, struct file *file)
 {
@@ -676,7 +849,7 @@ lpfc_debugfs_dumpHBASlim_open(struct inode *inode, struct file *file)
         if (!debug)
                 goto out;
 
-        /* Round to page boundry */
+        /* Round to page boundary */
         debug->buffer = kmalloc(LPFC_DUMPHBASLIM_SIZE, GFP_KERNEL);
         if (!debug->buffer) {
                 kfree(debug);
@@ -692,6 +865,21 @@ out:
         return rc;
 }
 
+/**
+ * lpfc_debugfs_dumpHostSlim_open - Open the Dump Host SLIM debugfs buffer.
+ * @inode: The inode pointer that contains a vport pointer.
+ * @file: The file pointer to attach the log output.
+ *
+ * Description:
+ * This routine is the entry point for the debugfs open file operation. It gets
+ * the vport from the i_private field in @inode, allocates the necessary buffer
+ * for the log, fills the buffer from the in-memory log for this vport, and then
+ * returns a pointer to that log in the private_data field in @file.
+ *
+ * Returns:
+ * This function returns zero if successful. On error it will return an negative
+ * error value.
+ **/
 static int
 lpfc_debugfs_dumpHostSlim_open(struct inode *inode, struct file *file)
 {
@@ -703,7 +891,7 @@ lpfc_debugfs_dumpHostSlim_open(struct inode *inode, struct file *file)
         if (!debug)
                 goto out;
 
-        /* Round to page boundry */
+        /* Round to page boundary */
         debug->buffer = kmalloc(LPFC_DUMPHOSTSLIM_SIZE, GFP_KERNEL);
         if (!debug->buffer) {
                 kfree(debug);
@@ -719,6 +907,21 @@ out:
         return rc;
 }
 
+/**
+ * lpfc_debugfs_nodelist_open - Open the nodelist debugfs file.
+ * @inode: The inode pointer that contains a vport pointer.
+ * @file: The file pointer to attach the log output.
+ *
+ * Description:
+ * This routine is the entry point for the debugfs open file operation. It gets
+ * the vport from the i_private field in @inode, allocates the necessary buffer
+ * for the log, fills the buffer from the in-memory log for this vport, and then
+ * returns a pointer to that log in the private_data field in @file.
+ *
+ * Returns:
+ * This function returns zero if successful. On error it will return an negative
+ * error value.
+ **/
 static int
 lpfc_debugfs_nodelist_open(struct inode *inode, struct file *file)
 {
@@ -730,7 +933,7 @@ lpfc_debugfs_nodelist_open(struct inode *inode, struct file *file)
         if (!debug)
                 goto out;
 
-        /* Round to page boundry */
+        /* Round to page boundary */
         debug->buffer = kmalloc(LPFC_NODELIST_SIZE, GFP_KERNEL);
         if (!debug->buffer) {
                 kfree(debug);
@@ -746,6 +949,23 @@ out:
         return rc;
 }
 
+/**
+ * lpfc_debugfs_lseek - Seek through a debugfs file.
+ * @file: The file pointer to seek through.
+ * @off: The offset to seek to or the amount to seek by.
+ * @whence: Indicates how to seek.
+ *
+ * Description:
+ * This routine is the entry point for the debugfs lseek file operation. The
+ * @whence parameter indicates whether @off is the offset to directly seek to,
+ * or if it is a value to seek forward or reverse by. This function figures out
+ * what the new offset of the debugfs file will be and assigns that value to the
+ * f_pos field of @file.
+ *
+ * Returns:
+ * This function returns the new offset if successful and returns a negative
+ * error if unable to process the seek.
+ **/
 static loff_t
 lpfc_debugfs_lseek(struct file *file, loff_t off, int whence)
 {
@@ -767,6 +987,22 @@ lpfc_debugfs_lseek(struct file *file, loff_t off, int whence)
         return (pos < 0 || pos > debug->len) ? -EINVAL : (file->f_pos = pos);
 }
 
+/**
+ * lpfc_debugfs_read - Read a debugfs file.
+ * @file: The file pointer to read from.
+ * @buf: The buffer to copy the data to.
+ * @nbytes: The number of bytes to read.
+ * @ppos: The position in the file to start reading from.
+ *
+ * Description:
+ * This routine reads data from from the buffer indicated in the private_data
+ * field of @file. It will start reading at @ppos and copy up to @nbytes of
+ * data to @buf.
+ *
+ * Returns:
+ * This function returns the amount of data that was read (this could be less
+ * than @nbytes if the end of the file was reached) or a negative error value.
+ **/
 static ssize_t
 lpfc_debugfs_read(struct file *file, char __user *buf,
                   size_t nbytes, loff_t *ppos)
@@ -776,6 +1012,18 @@ lpfc_debugfs_read(struct file *file, char __user *buf,
                                        debug->len);
 }
 
+/**
+ * lpfc_debugfs_release - Release the buffer used to store debugfs file data.
+ * @inode: The inode pointer that contains a vport pointer. (unused)
+ * @file: The file pointer that contains the buffer to release.
+ *
+ * Description:
+ * This routine frees the buffer that was allocated when the debugfs file was
+ * opened.
+ *
+ * Returns:
+ * This function returns zero.
+ **/
 static int
 lpfc_debugfs_release(struct inode *inode, struct file *file)
 {
@@ -845,6 +1093,16 @@ static struct dentry *lpfc_debugfs_root = NULL;
 static atomic_t lpfc_debugfs_hba_count;
 #endif
 
+/**
+ * lpfc_debugfs_initialize - Initialize debugfs for a vport.
+ * @vport: The vport pointer to initialize.
+ *
+ * Description:
+ * When Debugfs is configured this routine sets up the lpfc debugfs file system.
+ * If not already created, this routine will create the lpfc directory, and
+ * lpfcX directory (for this HBA), and vportX directory for this vport. It will
+ * also create each file used to access lpfc specific debugfs information.
+ **/
 inline void
 lpfc_debugfs_initialize(struct lpfc_vport *vport)
 {
@@ -862,7 +1120,7 @@ lpfc_debugfs_initialize(struct lpfc_vport *vport)
                 atomic_set(&lpfc_debugfs_hba_count, 0);
                 if (!lpfc_debugfs_root) {
                         lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT,
-                                         "0409 Cannot create debugfs root\n");
+                                         "0408 Cannot create debugfs root\n");
                         goto debug_failed;
                 }
         }
@@ -876,7 +1134,7 @@ lpfc_debugfs_initialize(struct lpfc_vport *vport)
                         debugfs_create_dir(name, lpfc_debugfs_root);
                 if (!phba->hba_debugfs_root) {
                         lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT,
-                                         "0409 Cannot create debugfs hba\n");
+                                         "0412 Cannot create debugfs hba\n");
                         goto debug_failed;
                 }
                 atomic_inc(&lpfc_debugfs_hba_count);
@@ -890,7 +1148,7 @@ lpfc_debugfs_initialize(struct lpfc_vport *vport)
                                  phba, &lpfc_debugfs_op_hbqinfo);
                 if (!phba->debug_hbqinfo) {
                         lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT,
-                                "0409 Cannot create debugfs hbqinfo\n");
+                                "0411 Cannot create debugfs hbqinfo\n");
                         goto debug_failed;
                 }
 
@@ -902,7 +1160,7 @@ lpfc_debugfs_initialize(struct lpfc_vport *vport)
                                  phba, &lpfc_debugfs_op_dumpHBASlim);
                 if (!phba->debug_dumpHBASlim) {
                         lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT,
-                                "0409 Cannot create debugfs dumpHBASlim\n");
+                                "0413 Cannot create debugfs dumpHBASlim\n");
                         goto debug_failed;
                 }
 
@@ -914,7 +1172,7 @@ lpfc_debugfs_initialize(struct lpfc_vport *vport)
                                  phba, &lpfc_debugfs_op_dumpHostSlim);
                 if (!phba->debug_dumpHostSlim) {
                         lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT,
-                                "0409 Cannot create debugfs dumpHostSlim\n");
+                                "0414 Cannot create debugfs dumpHostSlim\n");
                         goto debug_failed;
                 }
 
@@ -944,7 +1202,7 @@ lpfc_debugfs_initialize(struct lpfc_vport *vport)
                                  phba, &lpfc_debugfs_op_slow_ring_trc);
                 if (!phba->debug_slow_ring_trc) {
                         lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT,
-                                         "0409 Cannot create debugfs "
+                                         "0415 Cannot create debugfs "
                                          "slow_ring_trace\n");
                         goto debug_failed;
                 }
@@ -955,7 +1213,7 @@ lpfc_debugfs_initialize(struct lpfc_vport *vport)
                                 GFP_KERNEL);
                         if (!phba->slow_ring_trc) {
                                 lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT,
-                                                 "0409 Cannot create debugfs "
+                                                 "0416 Cannot create debugfs "
                                                  "slow_ring buffer\n");
                                 goto debug_failed;
                         }
@@ -972,7 +1230,7 @@ lpfc_debugfs_initialize(struct lpfc_vport *vport)
                         debugfs_create_dir(name, phba->hba_debugfs_root);
                 if (!vport->vport_debugfs_root) {
                         lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT,
-                                         "0409 Cant create debugfs");
+                                         "0417 Cant create debugfs");
                         goto debug_failed;
                 }
                 atomic_inc(&phba->debugfs_vport_count);
@@ -1001,7 +1259,7 @@ lpfc_debugfs_initialize(struct lpfc_vport *vport)
 
         if (!vport->disc_trc) {
                 lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT,
-                                 "0409 Cannot create debugfs disc trace "
+                                 "0418 Cannot create debugfs disc trace "
                                  "buffer\n");
                 goto debug_failed;
         }
@@ -1014,7 +1272,7 @@ lpfc_debugfs_initialize(struct lpfc_vport *vport)
                                  vport, &lpfc_debugfs_op_disc_trc);
         if (!vport->debug_disc_trc) {
                 lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT,
-                                 "0409 Cannot create debugfs "
+                                 "0419 Cannot create debugfs "
                                  "discovery_trace\n");
                 goto debug_failed;
         }
@@ -1033,7 +1291,17 @@ debug_failed:
 #endif
 }
 
-
+/**
+ * lpfc_debugfs_terminate -  Tear down debugfs infrastructure for this vport.
+ * @vport: The vport pointer to remove from debugfs.
+ *
+ * Description:
+ * When Debugfs is configured this routine removes debugfs file system elements
+ * that are specific to this vport. It also checks to see if there are any
+ * users left for the debugfs directories associated with the HBA and driver. If
+ * this is the last user of the HBA directory or driver directory then it will
+ * remove those from the debugfs infrastructure as well.
+ **/
 inline void
 lpfc_debugfs_terminate(struct lpfc_vport *vport)
 {
@@ -1096,5 +1364,3 @@ lpfc_debugfs_terminate(struct lpfc_vport *vport)
 #endif
         return;
 }
-
-
diff --git a/drivers/scsi/lpfc/lpfc_disc.h b/drivers/scsi/lpfc/lpfc_disc.h
index 2db0b74b6fad..f29e548a90d1 100644
--- a/drivers/scsi/lpfc/lpfc_disc.h
+++ b/drivers/scsi/lpfc/lpfc_disc.h
@@ -37,6 +37,7 @@ enum lpfc_work_type {
         LPFC_EVT_KILL,
         LPFC_EVT_ELS_RETRY,
         LPFC_EVT_DEV_LOSS,
+        LPFC_EVT_FASTPATH_MGMT_EVT,
 };
 
 /* structure used to queue event to the discovery tasklet */
@@ -47,6 +48,24 @@ struct lpfc_work_evt {
         enum lpfc_work_type   evt;
 };
 
+struct lpfc_scsi_check_condition_event;
+struct lpfc_scsi_varqueuedepth_event;
+struct lpfc_scsi_event_header;
+struct lpfc_fabric_event_header;
+struct lpfc_fcprdchkerr_event;
+
+/* structure used for sending events from fast path */
+struct lpfc_fast_path_event {
+        struct lpfc_work_evt work_evt;
+        struct lpfc_vport     *vport;
+        union {
+                struct lpfc_scsi_check_condition_event check_cond_evt;
+                struct lpfc_scsi_varqueuedepth_event queue_depth_evt;
+                struct lpfc_scsi_event_header scsi_evt;
+                struct lpfc_fabric_event_header fabric_evt;
+                struct lpfc_fcprdchkerr_event read_check_error;
+        } un;
+};
 
 struct lpfc_nodelist {
         struct list_head nlp_listp;
@@ -88,6 +107,10 @@ struct lpfc_nodelist {
         unsigned long last_ramp_up_time;        /* jiffy of last ramp up */
         unsigned long last_q_full_time;         /* jiffy of last queue full */
         struct kref     kref;
+        atomic_t cmd_pending;
+        uint32_t cmd_qdepth;
+        unsigned long last_change_time;
+        struct lpfc_scsicmd_bkt *lat_data;      /* Latency data */
 };
 
 /* Defines for nlp_flag (uint32) */
diff --git a/drivers/scsi/lpfc/lpfc_els.c b/drivers/scsi/lpfc/lpfc_els.c
index f54e0f7eaee3..630bd28fb997 100644
--- a/drivers/scsi/lpfc/lpfc_els.c
+++ b/drivers/scsi/lpfc/lpfc_els.c
@@ -30,6 +30,7 @@
 
 #include "lpfc_hw.h"
 #include "lpfc_sli.h"
+#include "lpfc_nl.h"
 #include "lpfc_disc.h"
 #include "lpfc_scsi.h"
 #include "lpfc.h"
@@ -53,6 +54,28 @@ static void lpfc_register_new_vport(struct lpfc_hba *phba,
 
 static int lpfc_max_els_tries = 3;
 
+/**
+ * lpfc_els_chk_latt: Check host link attention event for a vport.
+ * @vport: pointer to a host virtual N_Port data structure.
+ *
+ * This routine checks whether there is an outstanding host link
+ * attention event during the discovery process with the @vport. It is done
+ * by reading the HBA's Host Attention (HA) register. If there is any host
+ * link attention events during this @vport's discovery process, the @vport
+ * shall be marked as FC_ABORT_DISCOVERY, a host link attention clear shall
+ * be issued if the link state is not already in host link cleared state,
+ * and a return code shall indicate whether the host link attention event
+ * had happened.
+ *
+ * Note that, if either the host link is in state LPFC_LINK_DOWN or @vport
+ * state in LPFC_VPORT_READY, the request for checking host link attention
+ * event will be ignored and a return code shall indicate no host link
+ * attention event had happened.
+ *
+ * Return codes
+ *   0 - no host link attention event happened
+ *   1 - host link attention event happened
+ **/
 int
 lpfc_els_chk_latt(struct lpfc_vport *vport)
 {
@@ -92,6 +115,34 @@ lpfc_els_chk_latt(struct lpfc_vport *vport)
         return 1;
 }
 
+/**
+ * lpfc_prep_els_iocb: Allocate and prepare a lpfc iocb data structure.
+ * @vport: pointer to a host virtual N_Port data structure.
+ * @expectRsp: flag indicating whether response is expected.
+ * @cmdSize: size of the ELS command.
+ * @retry: number of retries to the command IOCB when it fails.
+ * @ndlp: pointer to a node-list data structure.
+ * @did: destination identifier.
+ * @elscmd: the ELS command code.
+ *
+ * This routine is used for allocating a lpfc-IOCB data structure from
+ * the driver lpfc-IOCB free-list and prepare the IOCB with the parameters
+ * passed into the routine for discovery state machine to issue an Extended
+ * Link Service (ELS) commands. It is a generic lpfc-IOCB allocation
+ * and preparation routine that is used by all the discovery state machine
+ * routines and the ELS command-specific fields will be later set up by
+ * the individual discovery machine routines after calling this routine
+ * allocating and preparing a generic IOCB data structure. It fills in the
+ * Buffer Descriptor Entries (BDEs), allocates buffers for both command
+ * payload and response payload (if expected). The reference count on the
+ * ndlp is incremented by 1 and the reference to the ndlp is put into
+ * context1 of the IOCB data structure for this IOCB to hold the ndlp
+ * reference for the command's callback function to access later.
+ *
+ * Return code
+ *   Pointer to the newly allocated/prepared els iocb data structure
+ *   NULL - when els iocb data structure allocation/preparation failed
+ **/
 static struct lpfc_iocbq *
 lpfc_prep_els_iocb(struct lpfc_vport *vport, uint8_t expectRsp,
                    uint16_t cmdSize, uint8_t retry,
@@ -150,7 +201,7 @@ lpfc_prep_els_iocb(struct lpfc_vport *vport, uint8_t expectRsp,
 
         icmd->un.elsreq64.bdl.addrHigh = putPaddrHigh(pbuflist->phys);
         icmd->un.elsreq64.bdl.addrLow = putPaddrLow(pbuflist->phys);
-        icmd->un.elsreq64.bdl.bdeFlags = BUFF_TYPE_BDL;
+        icmd->un.elsreq64.bdl.bdeFlags = BUFF_TYPE_BLP_64;
         icmd->un.elsreq64.remoteID = did;       /* DID */
         if (expectRsp) {
                 icmd->un.elsreq64.bdl.bdeSize = (2 * sizeof(struct ulp_bde64));
@@ -185,7 +236,7 @@ lpfc_prep_els_iocb(struct lpfc_vport *vport, uint8_t expectRsp,
                 bpl->addrLow = le32_to_cpu(putPaddrLow(prsp->phys));
                 bpl->addrHigh = le32_to_cpu(putPaddrHigh(prsp->phys));
                 bpl->tus.f.bdeSize = FCELSSIZE;
-                bpl->tus.f.bdeFlags = BUFF_USE_RCV;
+                bpl->tus.f.bdeFlags = BUFF_TYPE_BDE_64;
                 bpl->tus.w = le32_to_cpu(bpl->tus.w);
         }
 
@@ -233,6 +284,22 @@ els_iocb_free_pcmb_exit:
         return NULL;
 }
 
+/**
+ * lpfc_issue_fabric_reglogin: Issue fabric registration login for a vport.
+ * @vport: pointer to a host virtual N_Port data structure.
+ *
+ * This routine issues a fabric registration login for a @vport. An
+ * active ndlp node with Fabric_DID must already exist for this @vport.
+ * The routine invokes two mailbox commands to carry out fabric registration
+ * login through the HBA firmware: the first mailbox command requests the
+ * HBA to perform link configuration for the @vport; and the second mailbox
+ * command requests the HBA to perform the actual fabric registration login
+ * with the @vport.
+ *
+ * Return code
+ *   0 - successfully issued fabric registration login for @vport
+ *   -ENXIO -- failed to issue fabric registration login for @vport
+ **/
 static int
 lpfc_issue_fabric_reglogin(struct lpfc_vport *vport)
 {
@@ -313,6 +380,26 @@ fail:
         return -ENXIO;
 }
 
+/**
+ * lpfc_cmpl_els_flogi_fabric: Completion function for flogi to a fabric port.
+ * @vport: pointer to a host virtual N_Port data structure.
+ * @ndlp: pointer to a node-list data structure.
+ * @sp: pointer to service parameter data structure.
+ * @irsp: pointer to the IOCB within the lpfc response IOCB.
+ *
+ * This routine is invoked by the lpfc_cmpl_els_flogi() completion callback
+ * function to handle the completion of a Fabric Login (FLOGI) into a fabric
+ * port in a fabric topology. It properly sets up the parameters to the @ndlp
+ * from the IOCB response. It also check the newly assigned N_Port ID to the
+ * @vport against the previously assigned N_Port ID. If it is different from
+ * the previously assigned Destination ID (DID), the lpfc_unreg_rpi() routine
+ * is invoked on all the remaining nodes with the @vport to unregister the
+ * Remote Port Indicators (RPIs). Finally, the lpfc_issue_fabric_reglogin()
+ * is invoked to register login to the fabric.
+ *
+ * Return code
+ *   0 - Success (currently, always return 0)
+ **/
 static int
 lpfc_cmpl_els_flogi_fabric(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                            struct serv_parm *sp, IOCB_t *irsp)
@@ -387,7 +474,7 @@ lpfc_cmpl_els_flogi_fabric(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                  */
                 list_for_each_entry_safe(np, next_np,
                                         &vport->fc_nodes, nlp_listp) {
-                        if (!NLP_CHK_NODE_ACT(ndlp))
+                        if (!NLP_CHK_NODE_ACT(np))
                                 continue;
                         if ((np->nlp_state != NLP_STE_NPR_NODE) ||
                                    !(np->nlp_flag & NLP_NPR_ADISC))
@@ -416,9 +503,26 @@ lpfc_cmpl_els_flogi_fabric(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
         return 0;
 }
 
-/*
- * We FLOGIed into an NPort, initiate pt2pt protocol
- */
+/**
+ * lpfc_cmpl_els_flogi_nport: Completion function for flogi to an N_Port.
+ * @vport: pointer to a host virtual N_Port data structure.
+ * @ndlp: pointer to a node-list data structure.
+ * @sp: pointer to service parameter data structure.
+ *
+ * This routine is invoked by the lpfc_cmpl_els_flogi() completion callback
+ * function to handle the completion of a Fabric Login (FLOGI) into an N_Port
+ * in a point-to-point topology. First, the @vport's N_Port Name is compared
+ * with the received N_Port Name: if the @vport's N_Port Name is greater than
+ * the received N_Port Name lexicographically, this node shall assign local
+ * N_Port ID (PT2PT_LocalID: 1) and remote N_Port ID (PT2PT_RemoteID: 2) and
+ * will send out Port Login (PLOGI) with the N_Port IDs assigned. Otherwise,
+ * this node shall just wait for the remote node to issue PLOGI and assign
+ * N_Port IDs.
+ *
+ * Return code
+ *   0 - Success
+ *   -ENXIO - Fail
+ **/
 static int
 lpfc_cmpl_els_flogi_nport(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                           struct serv_parm *sp)
@@ -516,6 +620,29 @@ fail:
         return -ENXIO;
 }
 
+/**
+ * lpfc_cmpl_els_flogi: Completion callback function for flogi.
+ * @phba: pointer to lpfc hba data structure.
+ * @cmdiocb: pointer to lpfc command iocb data structure.
+ * @rspiocb: pointer to lpfc response iocb data structure.
+ *
+ * This routine is the top-level completion callback function for issuing
+ * a Fabric Login (FLOGI) command. If the response IOCB reported error,
+ * the lpfc_els_retry() routine shall be invoked to retry the FLOGI. If
+ * retry has been made (either immediately or delayed with lpfc_els_retry()
+ * returning 1), the command IOCB will be released and function returned.
+ * If the retry attempt has been given up (possibly reach the maximum
+ * number of retries), one additional decrement of ndlp reference shall be
+ * invoked before going out after releasing the command IOCB. This will
+ * actually release the remote node (Note, lpfc_els_free_iocb() will also
+ * invoke one decrement of ndlp reference count). If no error reported in
+ * the IOCB status, the command Port ID field is used to determine whether
+ * this is a point-to-point topology or a fabric topology: if the Port ID
+ * field is assigned, it is a fabric topology; otherwise, it is a
+ * point-to-point topology. The routine lpfc_cmpl_els_flogi_fabric() or
+ * lpfc_cmpl_els_flogi_nport() shall be invoked accordingly to handle the
+ * specific topology completion conditions.
+ **/
 static void
 lpfc_cmpl_els_flogi(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                     struct lpfc_iocbq *rspiocb)
@@ -618,6 +745,28 @@ out:
         lpfc_els_free_iocb(phba, cmdiocb);
 }
 
+/**
+ * lpfc_issue_els_flogi: Issue an flogi iocb command for a vport.
+ * @vport: pointer to a host virtual N_Port data structure.
+ * @ndlp: pointer to a node-list data structure.
+ * @retry: number of retries to the command IOCB.
+ *
+ * This routine issues a Fabric Login (FLOGI) Request ELS command
+ * for a @vport. The initiator service parameters are put into the payload
+ * of the FLOGI Request IOCB and the top-level callback function pointer
+ * to lpfc_cmpl_els_flogi() routine is put to the IOCB completion callback
+ * function field. The lpfc_issue_fabric_iocb routine is invoked to send
+ * out FLOGI ELS command with one outstanding fabric IOCB at a time.
+ *
+ * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
+ * will be incremented by 1 for holding the ndlp and the reference to ndlp
+ * will be stored into the context1 field of the IOCB for the completion
+ * callback function to the FLOGI ELS command.
+ *
+ * Return code
+ *   0 - successfully issued flogi iocb for @vport
+ *   1 - failed to issue flogi iocb for @vport
+ **/
 static int
 lpfc_issue_els_flogi(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                      uint8_t retry)
@@ -694,6 +843,20 @@ lpfc_issue_els_flogi(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
         return 0;
 }
 
+/**
+ * lpfc_els_abort_flogi: Abort all outstanding flogi iocbs.
+ * @phba: pointer to lpfc hba data structure.
+ *
+ * This routine aborts all the outstanding Fabric Login (FLOGI) IOCBs
+ * with a @phba. This routine walks all the outstanding IOCBs on the txcmplq
+ * list and issues an abort IOCB commond on each outstanding IOCB that
+ * contains a active Fabric_DID ndlp. Note that this function is to issue
+ * the abort IOCB command on all the outstanding IOCBs, thus when this
+ * function returns, it does not guarantee all the IOCBs are actually aborted.
+ *
+ * Return code
+ *   0 - Sucessfully issued abort iocb on all outstanding flogis (Always 0)
+ **/
 int
 lpfc_els_abort_flogi(struct lpfc_hba *phba)
 {
@@ -729,6 +892,22 @@ lpfc_els_abort_flogi(struct lpfc_hba *phba)
         return 0;
 }
 
+/**
+ * lpfc_initial_flogi: Issue an initial fabric login for a vport.
+ * @vport: pointer to a host virtual N_Port data structure.
+ *
+ * This routine issues an initial Fabric Login (FLOGI) for the @vport
+ * specified. It first searches the ndlp with the Fabric_DID (0xfffffe) from
+ * the @vport's ndlp list. If no such ndlp found, it will create an ndlp and
+ * put it into the @vport's ndlp list. If an inactive ndlp found on the list,
+ * it will just be enabled and made active. The lpfc_issue_els_flogi() routine
+ * is then invoked with the @vport and the ndlp to perform the FLOGI for the
+ * @vport.
+ *
+ * Return code
+ *   0 - failed to issue initial flogi for @vport
+ *   1 - successfully issued initial flogi for @vport
+ **/
 int
 lpfc_initial_flogi(struct lpfc_vport *vport)
 {
@@ -764,6 +943,22 @@ lpfc_initial_flogi(struct lpfc_vport *vport)
         return 1;
 }
 
+/**
+ * lpfc_initial_fdisc: Issue an initial fabric discovery for a vport.
+ * @vport: pointer to a host virtual N_Port data structure.
+ *
+ * This routine issues an initial Fabric Discover (FDISC) for the @vport
+ * specified. It first searches the ndlp with the Fabric_DID (0xfffffe) from
+ * the @vport's ndlp list. If no such ndlp found, it will create an ndlp and
+ * put it into the @vport's ndlp list. If an inactive ndlp found on the list,
+ * it will just be enabled and made active. The lpfc_issue_els_fdisc() routine
+ * is then invoked with the @vport and the ndlp to perform the FDISC for the
+ * @vport.
+ *
+ * Return code
+ *   0 - failed to issue initial fdisc for @vport
+ *   1 - successfully issued initial fdisc for @vport
+ **/
 int
 lpfc_initial_fdisc(struct lpfc_vport *vport)
 {
@@ -797,6 +992,17 @@ lpfc_initial_fdisc(struct lpfc_vport *vport)
         return 1;
 }
 
+/**
+ * lpfc_more_plogi: Check and issue remaining plogis for a vport.
+ * @vport: pointer to a host virtual N_Port data structure.
+ *
+ * This routine checks whether there are more remaining Port Logins
+ * (PLOGI) to be issued for the @vport. If so, it will invoke the routine
+ * lpfc_els_disc_plogi() to go through the Node Port Recovery (NPR) nodes
+ * to issue ELS PLOGIs up to the configured discover threads with the
+ * @vport (@vport->cfg_discovery_threads). The function also decrement
+ * the @vport's num_disc_node by 1 if it is not already 0.
+ **/
 void
 lpfc_more_plogi(struct lpfc_vport *vport)
 {
@@ -819,6 +1025,37 @@ lpfc_more_plogi(struct lpfc_vport *vport)
         return;
 }
 
+/**
+ * lpfc_plogi_confirm_nport: Confirm pologi wwpn matches stored ndlp.
+ * @phba: pointer to lpfc hba data structure.
+ * @prsp: pointer to response IOCB payload.
+ * @ndlp: pointer to a node-list data structure.
+ *
+ * This routine checks and indicates whether the WWPN of an N_Port, retrieved
+ * from a PLOGI, matches the WWPN that is stored in the @ndlp for that N_POrt.
+ * The following cases are considered N_Port confirmed:
+ * 1) The N_Port is a Fabric ndlp; 2) The @ndlp is on vport list and matches
+ * the WWPN of the N_Port logged into; 3) The @ndlp is not on vport list but
+ * it does not have WWPN assigned either. If the WWPN is confirmed, the
+ * pointer to the @ndlp will be returned. If the WWPN is not confirmed:
+ * 1) if there is a node on vport list other than the @ndlp with the same
+ * WWPN of the N_Port PLOGI logged into, the lpfc_unreg_rpi() will be invoked
+ * on that node to release the RPI associated with the node; 2) if there is
+ * no node found on vport list with the same WWPN of the N_Port PLOGI logged
+ * into, a new node shall be allocated (or activated). In either case, the
+ * parameters of the @ndlp shall be copied to the new_ndlp, the @ndlp shall
+ * be released and the new_ndlp shall be put on to the vport node list and
+ * its pointer returned as the confirmed node.
+ *
+ * Note that before the @ndlp got "released", the keepDID from not-matching
+ * or inactive "new_ndlp" on the vport node list is assigned to the nlp_DID
+ * of the @ndlp. This is because the release of @ndlp is actually to put it
+ * into an inactive state on the vport node list and the vport node list
+ * management algorithm does not allow two node with a same DID.
+ *
+ * Return code
+ *   pointer to the PLOGI N_Port @ndlp
+ **/
 static struct lpfc_nodelist *
 lpfc_plogi_confirm_nport(struct lpfc_hba *phba, uint32_t *prsp,
                          struct lpfc_nodelist *ndlp)
@@ -922,6 +1159,17 @@ lpfc_plogi_confirm_nport(struct lpfc_hba *phba, uint32_t *prsp,
         return new_ndlp;
 }
 
+/**
+ * lpfc_end_rscn: Check and handle more rscn for a vport.
+ * @vport: pointer to a host virtual N_Port data structure.
+ *
+ * This routine checks whether more Registration State Change
+ * Notifications (RSCNs) came in while the discovery state machine was in
+ * the FC_RSCN_MODE. If so, the lpfc_els_handle_rscn() routine will be
+ * invoked to handle the additional RSCNs for the @vport. Otherwise, the
+ * FC_RSCN_MODE bit will be cleared with the @vport to mark as the end of
+ * handling the RSCNs.
+ **/
 void
 lpfc_end_rscn(struct lpfc_vport *vport)
 {
@@ -943,6 +1191,26 @@ lpfc_end_rscn(struct lpfc_vport *vport)
         }
 }
 
+/**
+ * lpfc_cmpl_els_plogi: Completion callback function for plogi.
+ * @phba: pointer to lpfc hba data structure.
+ * @cmdiocb: pointer to lpfc command iocb data structure.
+ * @rspiocb: pointer to lpfc response iocb data structure.
+ *
+ * This routine is the completion callback function for issuing the Port
+ * Login (PLOGI) command. For PLOGI completion, there must be an active
+ * ndlp on the vport node list that matches the remote node ID from the
+ * PLOGI reponse IOCB. If such ndlp does not exist, the PLOGI is simply
+ * ignored and command IOCB released. The PLOGI response IOCB status is
+ * checked for error conditons. If there is error status reported, PLOGI
+ * retry shall be attempted by invoking the lpfc_els_retry() routine.
+ * Otherwise, the lpfc_plogi_confirm_nport() routine shall be invoked on
+ * the ndlp and the NLP_EVT_CMPL_PLOGI state to the Discover State Machine
+ * (DSM) is set for this PLOGI completion. Finally, it checks whether
+ * there are additional N_Port nodes with the vport that need to perform
+ * PLOGI. If so, the lpfc_more_plogi() routine is invoked to issue addition
+ * PLOGIs.
+ **/
 static void
 lpfc_cmpl_els_plogi(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                     struct lpfc_iocbq *rspiocb)
@@ -1048,6 +1316,27 @@ out:
         return;
 }
 
+/**
+ * lpfc_issue_els_plogi: Issue an plogi iocb command for a vport.
+ * @vport: pointer to a host virtual N_Port data structure.
+ * @did: destination port identifier.
+ * @retry: number of retries to the command IOCB.
+ *
+ * This routine issues a Port Login (PLOGI) command to a remote N_Port
+ * (with the @did) for a @vport. Before issuing a PLOGI to a remote N_Port,
+ * the ndlp with the remote N_Port DID must exist on the @vport's ndlp list.
+ * This routine constructs the proper feilds of the PLOGI IOCB and invokes
+ * the lpfc_sli_issue_iocb() routine to send out PLOGI ELS command.
+ *
+ * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
+ * will be incremented by 1 for holding the ndlp and the reference to ndlp
+ * will be stored into the context1 field of the IOCB for the completion
+ * callback function to the PLOGI ELS command.
+ *
+ * Return code
+ *   0 - Successfully issued a plogi for @vport
+ *   1 - failed to issue a plogi for @vport
+ **/
 int
 lpfc_issue_els_plogi(struct lpfc_vport *vport, uint32_t did, uint8_t retry)
 {
@@ -1106,6 +1395,19 @@ lpfc_issue_els_plogi(struct lpfc_vport *vport, uint32_t did, uint8_t retry)
         return 0;
 }
 
+/**
+ * lpfc_cmpl_els_prli: Completion callback function for prli.
+ * @phba: pointer to lpfc hba data structure.
+ * @cmdiocb: pointer to lpfc command iocb data structure.
+ * @rspiocb: pointer to lpfc response iocb data structure.
+ *
+ * This routine is the completion callback function for a Process Login
+ * (PRLI) ELS command. The PRLI response IOCB status is checked for error
+ * status. If there is error status reported, PRLI retry shall be attempted
+ * by invoking the lpfc_els_retry() routine. Otherwise, the state
+ * NLP_EVT_CMPL_PRLI is sent to the Discover State Machine (DSM) for this
+ * ndlp to mark the PRLI completion.
+ **/
 static void
 lpfc_cmpl_els_prli(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                    struct lpfc_iocbq *rspiocb)
@@ -1164,6 +1466,27 @@ out:
         return;
 }
 
+/**
+ * lpfc_issue_els_prli: Issue a prli iocb command for a vport.
+ * @vport: pointer to a host virtual N_Port data structure.
+ * @ndlp: pointer to a node-list data structure.
+ * @retry: number of retries to the command IOCB.
+ *
+ * This routine issues a Process Login (PRLI) ELS command for the
+ * @vport. The PRLI service parameters are set up in the payload of the
+ * PRLI Request command and the pointer to lpfc_cmpl_els_prli() routine
+ * is put to the IOCB completion callback func field before invoking the
+ * routine lpfc_sli_issue_iocb() to send out PRLI command.
+ *
+ * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
+ * will be incremented by 1 for holding the ndlp and the reference to ndlp
+ * will be stored into the context1 field of the IOCB for the completion
+ * callback function to the PRLI ELS command.
+ *
+ * Return code
+ *   0 - successfully issued prli iocb command for @vport
+ *   1 - failed to issue prli iocb command for @vport
+ **/
 int
 lpfc_issue_els_prli(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                     uint8_t retry)
@@ -1233,6 +1556,92 @@ lpfc_issue_els_prli(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
         return 0;
 }
 
+/**
+ * lpfc_rscn_disc: Perform rscn discovery for a vport.
+ * @vport: pointer to a host virtual N_Port data structure.
+ *
+ * This routine performs Registration State Change Notification (RSCN)
+ * discovery for a @vport. If the @vport's node port recovery count is not
+ * zero, it will invoke the lpfc_els_disc_plogi() to perform PLOGI for all
+ * the nodes that need recovery. If none of the PLOGI were needed through
+ * the lpfc_els_disc_plogi() routine, the lpfc_end_rscn() routine shall be
+ * invoked to check and handle possible more RSCN came in during the period
+ * of processing the current ones.
+ **/
+static void
+lpfc_rscn_disc(struct lpfc_vport *vport)
+{
+        lpfc_can_disctmo(vport);
+
+        /* RSCN discovery */
+        /* go thru NPR nodes and issue ELS PLOGIs */
+        if (vport->fc_npr_cnt)
+                if (lpfc_els_disc_plogi(vport))
+                        return;
+
+        lpfc_end_rscn(vport);
+}
+
+/**
+ * lpfc_adisc_done: Complete the adisc phase of discovery.
+ * @vport: pointer to lpfc_vport hba data structure that finished all ADISCs.
+ *
+ * This function is called when the final ADISC is completed during discovery.
+ * This function handles clearing link attention or issuing reg_vpi depending
+ * on whether npiv is enabled. This function also kicks off the PLOGI phase of
+ * discovery.
+ * This function is called with no locks held.
+ **/
+static void
+lpfc_adisc_done(struct lpfc_vport *vport)
+{
+        struct Scsi_Host   *shost = lpfc_shost_from_vport(vport);
+        struct lpfc_hba   *phba = vport->phba;
+
+        /*
+         * For NPIV, cmpl_reg_vpi will set port_state to READY,
+         * and continue discovery.
+         */
+        if ((phba->sli3_options & LPFC_SLI3_NPIV_ENABLED) &&
+            !(vport->fc_flag & FC_RSCN_MODE)) {
+                lpfc_issue_reg_vpi(phba, vport);
+                return;
+        }
+        /*
+        * For SLI2, we need to set port_state to READY
+        * and continue discovery.
+        */
+        if (vport->port_state < LPFC_VPORT_READY) {
+                /* If we get here, there is nothing to ADISC */
+                if (vport->port_type == LPFC_PHYSICAL_PORT)
+                        lpfc_issue_clear_la(phba, vport);
+                if (!(vport->fc_flag & FC_ABORT_DISCOVERY)) {
+                        vport->num_disc_nodes = 0;
+                        /* go thru NPR list, issue ELS PLOGIs */
+                        if (vport->fc_npr_cnt)
+                                lpfc_els_disc_plogi(vport);
+                        if (!vport->num_disc_nodes) {
+                                spin_lock_irq(shost->host_lock);
+                                vport->fc_flag &= ~FC_NDISC_ACTIVE;
+                                spin_unlock_irq(shost->host_lock);
+                                lpfc_can_disctmo(vport);
+                                lpfc_end_rscn(vport);
+                        }
+                }
+                vport->port_state = LPFC_VPORT_READY;
+        } else
+                lpfc_rscn_disc(vport);
+}
+
+/**
+ * lpfc_more_adisc: Issue more adisc as needed.
+ * @vport: pointer to a host virtual N_Port data structure.
+ *
+ * This routine determines whether there are more ndlps on a @vport
+ * node list need to have Address Discover (ADISC) issued. If so, it will
+ * invoke the lpfc_els_disc_adisc() routine to issue ADISC on the @vport's
+ * remaining nodes which need to have ADISC sent.
+ **/
 void
 lpfc_more_adisc(struct lpfc_vport *vport)
 {
@@ -1252,23 +1661,27 @@ lpfc_more_adisc(struct lpfc_vport *vport)
                 /* go thru NPR nodes and issue any remaining ELS ADISCs */
                 sentadisc = lpfc_els_disc_adisc(vport);
         }
+        if (!vport->num_disc_nodes)
+                lpfc_adisc_done(vport);
         return;
 }
 
-static void
-lpfc_rscn_disc(struct lpfc_vport *vport)
-{
-        lpfc_can_disctmo(vport);
-
-        /* RSCN discovery */
-        /* go thru NPR nodes and issue ELS PLOGIs */
-        if (vport->fc_npr_cnt)
-                if (lpfc_els_disc_plogi(vport))
-                        return;
-
-        lpfc_end_rscn(vport);
-}
-
+/**
+ * lpfc_cmpl_els_adisc: Completion callback function for adisc.
+ * @phba: pointer to lpfc hba data structure.
+ * @cmdiocb: pointer to lpfc command iocb data structure.
+ * @rspiocb: pointer to lpfc response iocb data structure.
+ *
+ * This routine is the completion function for issuing the Address Discover
+ * (ADISC) command. It first checks to see whether link went down during
+ * the discovery process. If so, the node will be marked as node port
+ * recovery for issuing discover IOCB by the link attention handler and
+ * exit. Otherwise, the response status is checked. If error was reported
+ * in the response status, the ADISC command shall be retried by invoking
+ * the lpfc_els_retry() routine. Otherwise, if no error was reported in
+ * the response status, the state machine is invoked to set transition
+ * with respect to NLP_EVT_CMPL_ADISC event.
+ **/
 static void
 lpfc_cmpl_els_adisc(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                     struct lpfc_iocbq *rspiocb)
@@ -1333,57 +1746,34 @@ lpfc_cmpl_els_adisc(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                 lpfc_disc_state_machine(vport, ndlp, cmdiocb,
                                         NLP_EVT_CMPL_ADISC);
 
-        if (disc && vport->num_disc_nodes) {
-                /* Check to see if there are more ADISCs to be sent */
+        /* Check to see if there are more ADISCs to be sent */
+        if (disc && vport->num_disc_nodes)
                 lpfc_more_adisc(vport);
-
-                /* Check to see if we are done with ADISC authentication */
-                if (vport->num_disc_nodes == 0) {
-                        /* If we get here, there is nothing left to ADISC */
-                        /*
-                         * For NPIV, cmpl_reg_vpi will set port_state to READY,
-                         * and continue discovery.
-                         */
-                        if ((phba->sli3_options & LPFC_SLI3_NPIV_ENABLED) &&
-                           !(vport->fc_flag & FC_RSCN_MODE)) {
-                                lpfc_issue_reg_vpi(phba, vport);
-                                goto out;
-                        }
-                        /*
-                         * For SLI2, we need to set port_state to READY
-                         * and continue discovery.
-                         */
-                        if (vport->port_state < LPFC_VPORT_READY) {
-                                /* If we get here, there is nothing to ADISC */
-                                if (vport->port_type == LPFC_PHYSICAL_PORT)
-                                        lpfc_issue_clear_la(phba, vport);
-
-                                if (!(vport->fc_flag & FC_ABORT_DISCOVERY)) {
-                                        vport->num_disc_nodes = 0;
-                                        /* go thru NPR list, issue ELS PLOGIs */
-                                        if (vport->fc_npr_cnt)
-                                                lpfc_els_disc_plogi(vport);
-
-                                        if (!vport->num_disc_nodes) {
-                                                spin_lock_irq(shost->host_lock);
-                                                vport->fc_flag &=
-                                                        ~FC_NDISC_ACTIVE;
-                                                spin_unlock_irq(
-                                                        shost->host_lock);
-                                                lpfc_can_disctmo(vport);
-                                        }
-                                }
-                                vport->port_state = LPFC_VPORT_READY;
-                        } else {
-                                lpfc_rscn_disc(vport);
-                        }
-                }
-        }
 out:
         lpfc_els_free_iocb(phba, cmdiocb);
         return;
 }
 
+/**
+ * lpfc_issue_els_adisc: Issue an address discover iocb to an node on a vport.
+ * @vport: pointer to a virtual N_Port data structure.
+ * @ndlp: pointer to a node-list data structure.
+ * @retry: number of retries to the command IOCB.
+ *
+ * This routine issues an Address Discover (ADISC) for an @ndlp on a
+ * @vport. It prepares the payload of the ADISC ELS command, updates the
+ * and states of the ndlp, and invokes the lpfc_sli_issue_iocb() routine
+ * to issue the ADISC ELS command.
+ *
+ * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
+ * will be incremented by 1 for holding the ndlp and the reference to ndlp
+ * will be stored into the context1 field of the IOCB for the completion
+ * callback function to the ADISC ELS command.
+ *
+ * Return code
+ *   0 - successfully issued adisc
+ *   1 - failed to issue adisc
+ **/
 int
 lpfc_issue_els_adisc(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                      uint8_t retry)
@@ -1437,6 +1827,18 @@ lpfc_issue_els_adisc(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
         return 0;
 }
 
+/**
+ * lpfc_cmpl_els_logo: Completion callback function for logo.
+ * @phba: pointer to lpfc hba data structure.
+ * @cmdiocb: pointer to lpfc command iocb data structure.
+ * @rspiocb: pointer to lpfc response iocb data structure.
+ *
+ * This routine is the completion function for issuing the ELS Logout (LOGO)
+ * command. If no error status was reported from the LOGO response, the
+ * state machine of the associated ndlp shall be invoked for transition with
+ * respect to NLP_EVT_CMPL_LOGO event. Otherwise, if error status was reported,
+ * the lpfc_els_retry() routine will be invoked to retry the LOGO command.
+ **/
 static void
 lpfc_cmpl_els_logo(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                    struct lpfc_iocbq *rspiocb)
@@ -1502,6 +1904,26 @@ out:
         return;
 }
 
+/**
+ * lpfc_issue_els_logo: Issue a logo to an node on a vport.
+ * @vport: pointer to a virtual N_Port data structure.
+ * @ndlp: pointer to a node-list data structure.
+ * @retry: number of retries to the command IOCB.
+ *
+ * This routine constructs and issues an ELS Logout (LOGO) iocb command
+ * to a remote node, referred by an @ndlp on a @vport. It constructs the
+ * payload of the IOCB, properly sets up the @ndlp state, and invokes the
+ * lpfc_sli_issue_iocb() routine to send out the LOGO ELS command.
+ *
+ * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
+ * will be incremented by 1 for holding the ndlp and the reference to ndlp
+ * will be stored into the context1 field of the IOCB for the completion
+ * callback function to the LOGO ELS command.
+ *
+ * Return code
+ *   0 - successfully issued logo
+ *   1 - failed to issue logo
+ **/
 int
 lpfc_issue_els_logo(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                     uint8_t retry)
@@ -1563,6 +1985,22 @@ lpfc_issue_els_logo(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
         return 0;
 }
 
+/**
+ * lpfc_cmpl_els_cmd: Completion callback function for generic els command.
+ * @phba: pointer to lpfc hba data structure.
+ * @cmdiocb: pointer to lpfc command iocb data structure.
+ * @rspiocb: pointer to lpfc response iocb data structure.
+ *
+ * This routine is a generic completion callback function for ELS commands.
+ * Specifically, it is the callback function which does not need to perform
+ * any command specific operations. It is currently used by the ELS command
+ * issuing routines for the ELS State Change  Request (SCR),
+ * lpfc_issue_els_scr(), and the ELS Fibre Channel Address Resolution
+ * Protocol Response (FARPR) routine, lpfc_issue_els_farpr(). Other than
+ * certain debug loggings, this callback function simply invokes the
+ * lpfc_els_chk_latt() routine to check whether link went down during the
+ * discovery process.
+ **/
 static void
 lpfc_cmpl_els_cmd(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                   struct lpfc_iocbq *rspiocb)
@@ -1587,6 +2025,28 @@ lpfc_cmpl_els_cmd(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
         return;
 }
 
+/**
+ * lpfc_issue_els_scr: Issue a scr to an node on a vport.
+ * @vport: pointer to a host virtual N_Port data structure.
+ * @nportid: N_Port identifier to the remote node.
+ * @retry: number of retries to the command IOCB.
+ *
+ * This routine issues a State Change Request (SCR) to a fabric node
+ * on a @vport. The remote node @nportid is passed into the function. It
+ * first search the @vport node list to find the matching ndlp. If no such
+ * ndlp is found, a new ndlp shall be created for this (SCR) purpose. An
+ * IOCB is allocated, payload prepared, and the lpfc_sli_issue_iocb()
+ * routine is invoked to send the SCR IOCB.
+ *
+ * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
+ * will be incremented by 1 for holding the ndlp and the reference to ndlp
+ * will be stored into the context1 field of the IOCB for the completion
+ * callback function to the SCR ELS command.
+ *
+ * Return code
+ *   0 - Successfully issued scr command
+ *   1 - Failed to issue scr command
+ **/
 int
 lpfc_issue_els_scr(struct lpfc_vport *vport, uint32_t nportid, uint8_t retry)
 {
@@ -1659,6 +2119,28 @@ lpfc_issue_els_scr(struct lpfc_vport *vport, uint32_t nportid, uint8_t retry)
         return 0;
 }
 
+/**
+ * lpfc_issue_els_farpr: Issue a farp to an node on a vport.
+ * @vport: pointer to a host virtual N_Port data structure.
+ * @nportid: N_Port identifier to the remote node.
+ * @retry: number of retries to the command IOCB.
+ *
+ * This routine issues a Fibre Channel Address Resolution Response
+ * (FARPR) to a node on a vport. The remote node N_Port identifier (@nportid)
+ * is passed into the function. It first search the @vport node list to find
+ * the matching ndlp. If no such ndlp is found, a new ndlp shall be created
+ * for this (FARPR) purpose. An IOCB is allocated, payload prepared, and the
+ * lpfc_sli_issue_iocb() routine is invoked to send the FARPR ELS command.
+ *
+ * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
+ * will be incremented by 1 for holding the ndlp and the reference to ndlp
+ * will be stored into the context1 field of the IOCB for the completion
+ * callback function to the PARPR ELS command.
+ *
+ * Return code
+ *   0 - Successfully issued farpr command
+ *   1 - Failed to issue farpr command
+ **/
 static int
 lpfc_issue_els_farpr(struct lpfc_vport *vport, uint32_t nportid, uint8_t retry)
 {
@@ -1748,6 +2230,18 @@ lpfc_issue_els_farpr(struct lpfc_vport *vport, uint32_t nportid, uint8_t retry)
         return 0;
 }
 
+/**
+ * lpfc_cancel_retry_delay_tmo: Cancel the timer with delayed iocb-cmd retry.
+ * @vport: pointer to a host virtual N_Port data structure.
+ * @nlp: pointer to a node-list data structure.
+ *
+ * This routine cancels the timer with a delayed IOCB-command retry for
+ * a @vport's @ndlp. It stops the timer for the delayed function retrial and
+ * removes the ELS retry event if it presents. In addition, if the
+ * NLP_NPR_2B_DISC bit is set in the @nlp's nlp_flag bitmap, ADISC IOCB
+ * commands are sent for the @vport's nodes that require issuing discovery
+ * ADISC.
+ **/
 void
 lpfc_cancel_retry_delay_tmo(struct lpfc_vport *vport, struct lpfc_nodelist *nlp)
 {
@@ -1775,25 +2269,36 @@ lpfc_cancel_retry_delay_tmo(struct lpfc_vport *vport, struct lpfc_nodelist *nlp)
                         if (vport->port_state < LPFC_VPORT_READY) {
                                 /* Check if there are more ADISCs to be sent */
                                 lpfc_more_adisc(vport);
-                                if ((vport->num_disc_nodes == 0) &&
-                                    (vport->fc_npr_cnt))
-                                        lpfc_els_disc_plogi(vport);
                         } else {
                                 /* Check if there are more PLOGIs to be sent */
                                 lpfc_more_plogi(vport);
-                        }
-                        if (vport->num_disc_nodes == 0) {
-                                spin_lock_irq(shost->host_lock);
-                                vport->fc_flag &= ~FC_NDISC_ACTIVE;
-                                spin_unlock_irq(shost->host_lock);
-                                lpfc_can_disctmo(vport);
-                                lpfc_end_rscn(vport);
+                                if (vport->num_disc_nodes == 0) {
+                                        spin_lock_irq(shost->host_lock);
+                                        vport->fc_flag &= ~FC_NDISC_ACTIVE;
+                                        spin_unlock_irq(shost->host_lock);
+                                        lpfc_can_disctmo(vport);
+                                        lpfc_end_rscn(vport);
+                                }
                         }
                 }
         }
         return;
 }
 
+/**
+ * lpfc_els_retry_delay: Timer function with a ndlp delayed function timer.
+ * @ptr: holder for the pointer to the timer function associated data (ndlp).
+ *
+ * This routine is invoked by the ndlp delayed-function timer to check
+ * whether there is any pending ELS retry event(s) with the node. If not, it
+ * simply returns. Otherwise, if there is at least one ELS delayed event, it
+ * adds the delayed events to the HBA work list and invokes the
+ * lpfc_worker_wake_up() routine to wake up worker thread to process the
+ * event. Note that lpfc_nlp_get() is called before posting the event to
+ * the work list to hold reference count of ndlp so that it guarantees the
+ * reference to ndlp will still be available when the worker thread gets
+ * to the event associated with the ndlp.
+ **/
 void
 lpfc_els_retry_delay(unsigned long ptr)
 {
@@ -1822,6 +2327,15 @@ lpfc_els_retry_delay(unsigned long ptr)
         return;
 }
 
+/**
+ * lpfc_els_retry_delay_handler: Work thread handler for ndlp delayed function.
+ * @ndlp: pointer to a node-list data structure.
+ *
+ * This routine is the worker-thread handler for processing the @ndlp delayed
+ * event(s), posted by the lpfc_els_retry_delay() routine. It simply retrieves
+ * the last ELS command from the associated ndlp and invokes the proper ELS
+ * function according to the delayed ELS command to retry the command.
+ **/
 void
 lpfc_els_retry_delay_handler(struct lpfc_nodelist *ndlp)
 {
@@ -1884,6 +2398,27 @@ lpfc_els_retry_delay_handler(struct lpfc_nodelist *ndlp)
         return;
 }
 
+/**
+ * lpfc_els_retry: Make retry decision on an els command iocb.
+ * @phba: pointer to lpfc hba data structure.
+ * @cmdiocb: pointer to lpfc command iocb data structure.
+ * @rspiocb: pointer to lpfc response iocb data structure.
+ *
+ * This routine makes a retry decision on an ELS command IOCB, which has
+ * failed. The following ELS IOCBs use this function for retrying the command
+ * when previously issued command responsed with error status: FLOGI, PLOGI,
+ * PRLI, ADISC, LOGO, and FDISC. Based on the ELS command type and the
+ * returned error status, it makes the decision whether a retry shall be
+ * issued for the command, and whether a retry shall be made immediately or
+ * delayed. In the former case, the corresponding ELS command issuing-function
+ * is called to retry the command. In the later case, the ELS command shall
+ * be posted to the ndlp delayed event and delayed function timer set to the
+ * ndlp for the delayed command issusing.
+ *
+ * Return code
+ *   0 - No retry of els command is made
+ *   1 - Immediate or delayed retry of els command is made
+ **/
 static int
 lpfc_els_retry(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                struct lpfc_iocbq *rspiocb)
@@ -2051,7 +2586,7 @@ lpfc_els_retry(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                           (stat.un.b.lsRjtRsnCodeExp == LSEXP_INVALID_NPORT_ID))
                           ) {
                                 lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
-                                                 "0123 FDISC Failed (x%x). "
+                                                 "0122 FDISC Failed (x%x). "
                                                  "Fabric Detected Bad WWN\n",
                                                  stat.un.lsRjtError);
                                 lpfc_vport_set_state(vport,
@@ -2182,12 +2717,26 @@ lpfc_els_retry(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
         return 0;
 }
 
+/**
+ * lpfc_els_free_data: Free lpfc dma buffer and data structure with an iocb.
+ * @phba: pointer to lpfc hba data structure.
+ * @buf_ptr1: pointer to the lpfc DMA buffer data structure.
+ *
+ * This routine releases the lpfc DMA (Direct Memory Access) buffer(s)
+ * associated with a command IOCB back to the lpfc DMA buffer pool. It first
+ * checks to see whether there is a lpfc DMA buffer associated with the
+ * response of the command IOCB. If so, it will be released before releasing
+ * the lpfc DMA buffer associated with the IOCB itself.
+ *
+ * Return code
+ *   0 - Successfully released lpfc DMA buffer (currently, always return 0)
+ **/
 static int
 lpfc_els_free_data(struct lpfc_hba *phba, struct lpfc_dmabuf *buf_ptr1)
 {
         struct lpfc_dmabuf *buf_ptr;
 
-        /* Free the response before processing the command.  */
+        /* Free the response before processing the command. */
         if (!list_empty(&buf_ptr1->list)) {
                 list_remove_head(&buf_ptr1->list, buf_ptr,
                                  struct lpfc_dmabuf,
@@ -2200,6 +2749,18 @@ lpfc_els_free_data(struct lpfc_hba *phba, struct lpfc_dmabuf *buf_ptr1)
         return 0;
 }
 
+/**
+ * lpfc_els_free_bpl: Free lpfc dma buffer and data structure with bpl.
+ * @phba: pointer to lpfc hba data structure.
+ * @buf_ptr: pointer to the lpfc dma buffer data structure.
+ *
+ * This routine releases the lpfc Direct Memory Access (DMA) buffer
+ * associated with a Buffer Pointer List (BPL) back to the lpfc DMA buffer
+ * pool.
+ *
+ * Return code
+ *   0 - Successfully released lpfc DMA buffer (currently, always return 0)
+ **/
 static int
 lpfc_els_free_bpl(struct lpfc_hba *phba, struct lpfc_dmabuf *buf_ptr)
 {
@@ -2208,6 +2769,33 @@ lpfc_els_free_bpl(struct lpfc_hba *phba, struct lpfc_dmabuf *buf_ptr)
         return 0;
 }
 
+/**
+ * lpfc_els_free_iocb: Free a command iocb and its associated resources.
+ * @phba: pointer to lpfc hba data structure.
+ * @elsiocb: pointer to lpfc els command iocb data structure.
+ *
+ * This routine frees a command IOCB and its associated resources. The
+ * command IOCB data structure contains the reference to various associated
+ * resources, these fields must be set to NULL if the associated reference
+ * not present:
+ *   context1 - reference to ndlp
+ *   context2 - reference to cmd
+ *   context2->next - reference to rsp
+ *   context3 - reference to bpl
+ *
+ * It first properly decrements the reference count held on ndlp for the
+ * IOCB completion callback function. If LPFC_DELAY_MEM_FREE flag is not
+ * set, it invokes the lpfc_els_free_data() routine to release the Direct
+ * Memory Access (DMA) buffers associated with the IOCB. Otherwise, it
+ * adds the DMA buffer the @phba data structure for the delayed release.
+ * If reference to the Buffer Pointer List (BPL) is present, the
+ * lpfc_els_free_bpl() routine is invoked to release the DMA memory
+ * associated with BPL. Finally, the lpfc_sli_release_iocbq() routine is
+ * invoked to release the IOCB data structure back to @phba IOCBQ list.
+ *
+ * Return code
+ *   0 - Success (currently, always return 0)
+ **/
 int
 lpfc_els_free_iocb(struct lpfc_hba *phba, struct lpfc_iocbq *elsiocb)
 {
@@ -2274,6 +2862,23 @@ lpfc_els_free_iocb(struct lpfc_hba *phba, struct lpfc_iocbq *elsiocb)
         return 0;
 }
 
+/**
+ * lpfc_cmpl_els_logo_acc: Completion callback function to logo acc response.
+ * @phba: pointer to lpfc hba data structure.
+ * @cmdiocb: pointer to lpfc command iocb data structure.
+ * @rspiocb: pointer to lpfc response iocb data structure.
+ *
+ * This routine is the completion callback function to the Logout (LOGO)
+ * Accept (ACC) Response ELS command. This routine is invoked to indicate
+ * the completion of the LOGO process. It invokes the lpfc_nlp_not_used() to
+ * release the ndlp if it has the last reference remaining (reference count
+ * is 1). If succeeded (meaning ndlp released), it sets the IOCB context1
+ * field to NULL to inform the following lpfc_els_free_iocb() routine no
+ * ndlp reference count needs to be decremented. Otherwise, the ndlp
+ * reference use-count shall be decremented by the lpfc_els_free_iocb()
+ * routine. Finally, the lpfc_els_free_iocb() is invoked to release the
+ * IOCB data structure.
+ **/
 static void
 lpfc_cmpl_els_logo_acc(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                        struct lpfc_iocbq *rspiocb)
@@ -2311,6 +2916,19 @@ lpfc_cmpl_els_logo_acc(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
         return;
 }
 
+/**
+ * lpfc_mbx_cmpl_dflt_rpi: Completion callbk func for unreg dflt rpi mbox cmd.
+ * @phba: pointer to lpfc hba data structure.
+ * @pmb: pointer to the driver internal queue element for mailbox command.
+ *
+ * This routine is the completion callback function for unregister default
+ * RPI (Remote Port Index) mailbox command to the @phba. It simply releases
+ * the associated lpfc Direct Memory Access (DMA) buffer back to the pool and
+ * decrements the ndlp reference count held for this completion callback
+ * function. After that, it invokes the lpfc_nlp_not_used() to check
+ * whether there is only one reference left on the ndlp. If so, it will
+ * perform one more decrement and trigger the release of the ndlp.
+ **/
 void
 lpfc_mbx_cmpl_dflt_rpi(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
 {
@@ -2332,6 +2950,22 @@ lpfc_mbx_cmpl_dflt_rpi(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
         return;
 }
 
+/**
+ * lpfc_cmpl_els_rsp: Completion callback function for els response iocb cmd.
+ * @phba: pointer to lpfc hba data structure.
+ * @cmdiocb: pointer to lpfc command iocb data structure.
+ * @rspiocb: pointer to lpfc response iocb data structure.
+ *
+ * This routine is the completion callback function for ELS Response IOCB
+ * command. In normal case, this callback function just properly sets the
+ * nlp_flag bitmap in the ndlp data structure, if the mbox command reference
+ * field in the command IOCB is not NULL, the referred mailbox command will
+ * be send out, and then invokes the lpfc_els_free_iocb() routine to release
+ * the IOCB. Under error conditions, such as when a LS_RJT is returned or a
+ * link down event occurred during the discovery, the lpfc_nlp_not_used()
+ * routine shall be invoked trying to release the ndlp if no other threads
+ * are currently referring it.
+ **/
 static void
 lpfc_cmpl_els_rsp(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                   struct lpfc_iocbq *rspiocb)
@@ -2487,6 +3121,31 @@ out:
         return;
 }
 
+/**
+ * lpfc_els_rsp_acc: Prepare and issue an acc response iocb command.
+ * @vport: pointer to a host virtual N_Port data structure.
+ * @flag: the els command code to be accepted.
+ * @oldiocb: pointer to the original lpfc command iocb data structure.
+ * @ndlp: pointer to a node-list data structure.
+ * @mbox: pointer to the driver internal queue element for mailbox command.
+ *
+ * This routine prepares and issues an Accept (ACC) response IOCB
+ * command. It uses the @flag to properly set up the IOCB field for the
+ * specific ACC response command to be issued and invokes the
+ * lpfc_sli_issue_iocb() routine to send out ACC response IOCB. If a
+ * @mbox pointer is passed in, it will be put into the context_un.mbox
+ * field of the IOCB for the completion callback function to issue the
+ * mailbox command to the HBA later when callback is invoked.
+ *
+ * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
+ * will be incremented by 1 for holding the ndlp and the reference to ndlp
+ * will be stored into the context1 field of the IOCB for the completion
+ * callback function to the corresponding response ELS IOCB command.
+ *
+ * Return code
+ *   0 - Successfully issued acc response
+ *   1 - Failed to issue acc response
+ **/
 int
 lpfc_els_rsp_acc(struct lpfc_vport *vport, uint32_t flag,
                  struct lpfc_iocbq *oldiocb, struct lpfc_nodelist *ndlp,
@@ -2601,6 +3260,28 @@ lpfc_els_rsp_acc(struct lpfc_vport *vport, uint32_t flag,
         return 0;
 }
 
+/**
+ * lpfc_els_rsp_reject: Propare and issue a rjt response iocb command.
+ * @vport: pointer to a virtual N_Port data structure.
+ * @rejectError:
+ * @oldiocb: pointer to the original lpfc command iocb data structure.
+ * @ndlp: pointer to a node-list data structure.
+ * @mbox: pointer to the driver internal queue element for mailbox command.
+ *
+ * This routine prepares and issue an Reject (RJT) response IOCB
+ * command. If a @mbox pointer is passed in, it will be put into the
+ * context_un.mbox field of the IOCB for the completion callback function
+ * to issue to the HBA later.
+ *
+ * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
+ * will be incremented by 1 for holding the ndlp and the reference to ndlp
+ * will be stored into the context1 field of the IOCB for the completion
+ * callback function to the reject response ELS IOCB command.
+ *
+ * Return code
+ *   0 - Successfully issued reject response
+ *   1 - Failed to issue reject response
+ **/
 int
 lpfc_els_rsp_reject(struct lpfc_vport *vport, uint32_t rejectError,
                     struct lpfc_iocbq *oldiocb, struct lpfc_nodelist *ndlp,
@@ -2660,6 +3341,25 @@ lpfc_els_rsp_reject(struct lpfc_vport *vport, uint32_t rejectError,
         return 0;
 }
 
+/**
+ * lpfc_els_rsp_adisc_acc: Prepare and issue acc response to adisc iocb cmd.
+ * @vport: pointer to a virtual N_Port data structure.
+ * @oldiocb: pointer to the original lpfc command iocb data structure.
+ * @ndlp: pointer to a node-list data structure.
+ *
+ * This routine prepares and issues an Accept (ACC) response to Address
+ * Discover (ADISC) ELS command. It simply prepares the payload of the IOCB
+ * and invokes the lpfc_sli_issue_iocb() routine to send out the command.
+ *
+ * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
+ * will be incremented by 1 for holding the ndlp and the reference to ndlp
+ * will be stored into the context1 field of the IOCB for the completion
+ * callback function to the ADISC Accept response ELS IOCB command.
+ *
+ * Return code
+ *   0 - Successfully issued acc adisc response
+ *   1 - Failed to issue adisc acc response
+ **/
 int
 lpfc_els_rsp_adisc_acc(struct lpfc_vport *vport, struct lpfc_iocbq *oldiocb,
                        struct lpfc_nodelist *ndlp)
@@ -2716,6 +3416,25 @@ lpfc_els_rsp_adisc_acc(struct lpfc_vport *vport, struct lpfc_iocbq *oldiocb,
         return 0;
 }
 
+/**
+ * lpfc_els_rsp_prli_acc: Prepare and issue acc response to prli iocb cmd.
+ * @vport: pointer to a virtual N_Port data structure.
+ * @oldiocb: pointer to the original lpfc command iocb data structure.
+ * @ndlp: pointer to a node-list data structure.
+ *
+ * This routine prepares and issues an Accept (ACC) response to Process
+ * Login (PRLI) ELS command. It simply prepares the payload of the IOCB
+ * and invokes the lpfc_sli_issue_iocb() routine to send out the command.
+ *
+ * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
+ * will be incremented by 1 for holding the ndlp and the reference to ndlp
+ * will be stored into the context1 field of the IOCB for the completion
+ * callback function to the PRLI Accept response ELS IOCB command.
+ *
+ * Return code
+ *   0 - Successfully issued acc prli response
+ *   1 - Failed to issue acc prli response
+ **/
 int
 lpfc_els_rsp_prli_acc(struct lpfc_vport *vport, struct lpfc_iocbq *oldiocb,
                       struct lpfc_nodelist *ndlp)
@@ -2795,6 +3514,32 @@ lpfc_els_rsp_prli_acc(struct lpfc_vport *vport, struct lpfc_iocbq *oldiocb,
         return 0;
 }
 
+/**
+ * lpfc_els_rsp_rnid_acc: Issue rnid acc response iocb command.
+ * @vport: pointer to a virtual N_Port data structure.
+ * @format: rnid command format.
+ * @oldiocb: pointer to the original lpfc command iocb data structure.
+ * @ndlp: pointer to a node-list data structure.
+ *
+ * This routine issues a Request Node Identification Data (RNID) Accept
+ * (ACC) response. It constructs the RNID ACC response command according to
+ * the proper @format and then calls the lpfc_sli_issue_iocb() routine to
+ * issue the response. Note that this command does not need to hold the ndlp
+ * reference count for the callback. So, the ndlp reference count taken by
+ * the lpfc_prep_els_iocb() routine is put back and the context1 field of
+ * IOCB is set to NULL to indicate to the lpfc_els_free_iocb() routine that
+ * there is no ndlp reference available.
+ *
+ * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
+ * will be incremented by 1 for holding the ndlp and the reference to ndlp
+ * will be stored into the context1 field of the IOCB for the completion
+ * callback function. However, for the RNID Accept Response ELS command,
+ * this is undone later by this routine after the IOCB is allocated.
+ *
+ * Return code
+ *   0 - Successfully issued acc rnid response
+ *   1 - Failed to issue acc rnid response
+ **/
 static int
 lpfc_els_rsp_rnid_acc(struct lpfc_vport *vport, uint8_t format,
                       struct lpfc_iocbq *oldiocb, struct lpfc_nodelist *ndlp)
@@ -2875,6 +3620,25 @@ lpfc_els_rsp_rnid_acc(struct lpfc_vport *vport, uint8_t format,
         return 0;
 }
 
+/**
+ * lpfc_els_disc_adisc: Issue remaining adisc iocbs to npr nodes of a vport.
+ * @vport: pointer to a host virtual N_Port data structure.
+ *
+ * This routine issues Address Discover (ADISC) ELS commands to those
+ * N_Ports which are in node port recovery state and ADISC has not been issued
+ * for the @vport. Each time an ELS ADISC IOCB is issued by invoking the
+ * lpfc_issue_els_adisc() routine, the per @vport number of discover count
+ * (num_disc_nodes) shall be incremented. If the num_disc_nodes reaches a
+ * pre-configured threshold (cfg_discovery_threads), the @vport fc_flag will
+ * be marked with FC_NLP_MORE bit and the process of issuing remaining ADISC
+ * IOCBs quit for later pick up. On the other hand, after walking through
+ * all the ndlps with the @vport and there is none ADISC IOCB issued, the
+ * @vport fc_flag shall be cleared with FC_NLP_MORE bit indicating there is
+ * no more ADISC need to be sent.
+ *
+ * Return code
+ *    The number of N_Ports with adisc issued.
+ **/
 int
 lpfc_els_disc_adisc(struct lpfc_vport *vport)
 {
@@ -2914,6 +3678,25 @@ lpfc_els_disc_adisc(struct lpfc_vport *vport)
         return sentadisc;
 }
 
+/**
+ * lpfc_els_disc_plogi: Issue plogi for all npr nodes of a vport before adisc.
+ * @vport: pointer to a host virtual N_Port data structure.
+ *
+ * This routine issues Port Login (PLOGI) ELS commands to all the N_Ports
+ * which are in node port recovery state, with a @vport. Each time an ELS
+ * ADISC PLOGI IOCB is issued by invoking the lpfc_issue_els_plogi() routine,
+ * the per @vport number of discover count (num_disc_nodes) shall be
+ * incremented. If the num_disc_nodes reaches a pre-configured threshold
+ * (cfg_discovery_threads), the @vport fc_flag will be marked with FC_NLP_MORE
+ * bit set and quit the process of issuing remaining ADISC PLOGIN IOCBs for
+ * later pick up. On the other hand, after walking through all the ndlps with
+ * the @vport and there is none ADISC PLOGI IOCB issued, the @vport fc_flag
+ * shall be cleared with the FC_NLP_MORE bit indicating there is no more ADISC
+ * PLOGI need to be sent.
+ *
+ * Return code
+ *   The number of N_Ports with plogi issued.
+ **/
 int
 lpfc_els_disc_plogi(struct lpfc_vport *vport)
 {
@@ -2954,6 +3737,15 @@ lpfc_els_disc_plogi(struct lpfc_vport *vport)
         return sentplogi;
 }
 
+/**
+ * lpfc_els_flush_rscn: Clean up any rscn activities with a vport.
+ * @vport: pointer to a host virtual N_Port data structure.
+ *
+ * This routine cleans up any Registration State Change Notification
+ * (RSCN) activity with a @vport. Note that the fc_rscn_flush flag of the
+ * @vport together with the host_lock is used to prevent multiple thread
+ * trying to access the RSCN array on a same @vport at the same time.
+ **/
 void
 lpfc_els_flush_rscn(struct lpfc_vport *vport)
 {
@@ -2984,6 +3776,18 @@ lpfc_els_flush_rscn(struct lpfc_vport *vport)
         vport->fc_rscn_flush = 0;
 }
 
+/**
+ * lpfc_rscn_payload_check: Check whether there is a pending rscn to a did.
+ * @vport: pointer to a host virtual N_Port data structure.
+ * @did: remote destination port identifier.
+ *
+ * This routine checks whether there is any pending Registration State
+ * Configuration Notification (RSCN) to a @did on @vport.
+ *
+ * Return code
+ *   None zero - The @did matched with a pending rscn
+ *   0 - not able to match @did with a pending rscn
+ **/
 int
 lpfc_rscn_payload_check(struct lpfc_vport *vport, uint32_t did)
 {
@@ -3053,6 +3857,17 @@ return_did_out:
         return did;
 }
 
+/**
+ * lpfc_rscn_recovery_check: Send recovery event to vport nodes matching rscn
+ * @vport: pointer to a host virtual N_Port data structure.
+ *
+ * This routine sends recovery (NLP_EVT_DEVICE_RECOVERY) event to the
+ * state machine for a @vport's nodes that are with pending RSCN (Registration
+ * State Change Notification).
+ *
+ * Return code
+ *   0 - Successful (currently alway return 0)
+ **/
 static int
 lpfc_rscn_recovery_check(struct lpfc_vport *vport)
 {
@@ -3071,6 +3886,28 @@ lpfc_rscn_recovery_check(struct lpfc_vport *vport)
         return 0;
 }
 
+/**
+ * lpfc_els_rcv_rscn: Process an unsolicited rscn iocb.
+ * @vport: pointer to a host virtual N_Port data structure.
+ * @cmdiocb: pointer to lpfc command iocb data structure.
+ * @ndlp: pointer to a node-list data structure.
+ *
+ * This routine processes an unsolicited RSCN (Registration State Change
+ * Notification) IOCB. First, the payload of the unsolicited RSCN is walked
+ * to invoke fc_host_post_event() routine to the FC transport layer. If the
+ * discover state machine is about to begin discovery, it just accepts the
+ * RSCN and the discovery process will satisfy the RSCN. If this RSCN only
+ * contains N_Port IDs for other vports on this HBA, it just accepts the
+ * RSCN and ignore processing it. If the state machine is in the recovery
+ * state, the fc_rscn_id_list of this @vport is walked and the
+ * lpfc_rscn_recovery_check() routine is invoked to send recovery event for
+ * all nodes that match RSCN payload. Otherwise, the lpfc_els_handle_rscn()
+ * routine is invoked to handle the RSCN event.
+ *
+ * Return code
+ *   0 - Just sent the acc response
+ *   1 - Sent the acc response and waited for name server completion
+ **/
 static int
 lpfc_els_rcv_rscn(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
                   struct lpfc_nodelist *ndlp)
@@ -3130,7 +3967,7 @@ lpfc_els_rcv_rscn(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
                 if (rscn_id == hba_id) {
                         /* ALL NPortIDs in RSCN are on HBA */
                         lpfc_printf_vlog(vport, KERN_INFO, LOG_DISCOVERY,
-                                         "0214 Ignore RSCN "
+                                         "0219 Ignore RSCN "
                                          "Data: x%x x%x x%x x%x\n",
                                          vport->fc_flag, payload_len,
                                          *lp, vport->fc_rscn_id_cnt);
@@ -3241,6 +4078,22 @@ lpfc_els_rcv_rscn(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
         return lpfc_els_handle_rscn(vport);
 }
 
+/**
+ * lpfc_els_handle_rscn: Handle rscn for a vport.
+ * @vport: pointer to a host virtual N_Port data structure.
+ *
+ * This routine handles the Registration State Configuration Notification
+ * (RSCN) for a @vport. If login to NameServer does not exist, a new ndlp shall
+ * be created and a Port Login (PLOGI) to the NameServer is issued. Otherwise,
+ * if the ndlp to NameServer exists, a Common Transport (CT) command to the
+ * NameServer shall be issued. If CT command to the NameServer fails to be
+ * issued, the lpfc_els_flush_rscn() routine shall be invoked to clean up any
+ * RSCN activities with the @vport.
+ *
+ * Return code
+ *   0 - Cleaned up rscn on the @vport
+ *   1 - Wait for plogi to name server before proceed
+ **/
 int
 lpfc_els_handle_rscn(struct lpfc_vport *vport)
 {
@@ -3313,6 +4166,31 @@ lpfc_els_handle_rscn(struct lpfc_vport *vport)
         return 0;
 }
 
+/**
+ * lpfc_els_rcv_flogi: Process an unsolicited flogi iocb.
+ * @vport: pointer to a host virtual N_Port data structure.
+ * @cmdiocb: pointer to lpfc command iocb data structure.
+ * @ndlp: pointer to a node-list data structure.
+ *
+ * This routine processes Fabric Login (FLOGI) IOCB received as an ELS
+ * unsolicited event. An unsolicited FLOGI can be received in a point-to-
+ * point topology. As an unsolicited FLOGI should not be received in a loop
+ * mode, any unsolicited FLOGI received in loop mode shall be ignored. The
+ * lpfc_check_sparm() routine is invoked to check the parameters in the
+ * unsolicited FLOGI. If parameters validation failed, the routine
+ * lpfc_els_rsp_reject() shall be called with reject reason code set to
+ * LSEXP_SPARM_OPTIONS to reject the FLOGI. Otherwise, the Port WWN in the
+ * FLOGI shall be compared with the Port WWN of the @vport to determine who
+ * will initiate PLOGI. The higher lexicographical value party shall has
+ * higher priority (as the winning port) and will initiate PLOGI and
+ * communicate Port_IDs (Addresses) for both nodes in PLOGI. The result
+ * of this will be marked in the @vport fc_flag field with FC_PT2PT_PLOGI
+ * and then the lpfc_els_rsp_acc() routine is invoked to accept the FLOGI.
+ *
+ * Return code
+ *   0 - Successfully processed the unsolicited flogi
+ *   1 - Failed to process the unsolicited flogi
+ **/
 static int
 lpfc_els_rcv_flogi(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
                    struct lpfc_nodelist *ndlp)
@@ -3402,6 +4280,22 @@ lpfc_els_rcv_flogi(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
         return 0;
 }
 
+/**
+ * lpfc_els_rcv_rnid: Process an unsolicited rnid iocb.
+ * @vport: pointer to a host virtual N_Port data structure.
+ * @cmdiocb: pointer to lpfc command iocb data structure.
+ * @ndlp: pointer to a node-list data structure.
+ *
+ * This routine processes Request Node Identification Data (RNID) IOCB
+ * received as an ELS unsolicited event. Only when the RNID specified format
+ * 0x0 or 0xDF (Topology Discovery Specific Node Identification Data)
+ * present, this routine will invoke the lpfc_els_rsp_rnid_acc() routine to
+ * Accept (ACC) the RNID ELS command. All the other RNID formats are
+ * rejected by invoking the lpfc_els_rsp_reject() routine.
+ *
+ * Return code
+ *   0 - Successfully processed rnid iocb (currently always return 0)
+ **/
 static int
 lpfc_els_rcv_rnid(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
                   struct lpfc_nodelist *ndlp)
@@ -3441,6 +4335,19 @@ lpfc_els_rcv_rnid(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
         return 0;
 }
 
+/**
+ * lpfc_els_rcv_lirr: Process an unsolicited lirr iocb.
+ * @vport: pointer to a host virtual N_Port data structure.
+ * @cmdiocb: pointer to lpfc command iocb data structure.
+ * @ndlp: pointer to a node-list data structure.
+ *
+ * This routine processes a Link Incident Report Registration(LIRR) IOCB
+ * received as an ELS unsolicited event. Currently, this function just invokes
+ * the lpfc_els_rsp_reject() routine to reject the LIRR IOCB unconditionally.
+ *
+ * Return code
+ *   0 - Successfully processed lirr iocb (currently always return 0)
+ **/
 static int
 lpfc_els_rcv_lirr(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
                   struct lpfc_nodelist *ndlp)
@@ -3456,6 +4363,25 @@ lpfc_els_rcv_lirr(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
         return 0;
 }
 
+/**
+ * lpfc_els_rsp_rps_acc: Completion callbk func for MBX_READ_LNK_STAT mbox cmd.
+ * @phba: pointer to lpfc hba data structure.
+ * @pmb: pointer to the driver internal queue element for mailbox command.
+ *
+ * This routine is the completion callback function for the MBX_READ_LNK_STAT
+ * mailbox command. This callback function is to actually send the Accept
+ * (ACC) response to a Read Port Status (RPS) unsolicited IOCB event. It
+ * collects the link statistics from the completion of the MBX_READ_LNK_STAT
+ * mailbox command, constructs the RPS response with the link statistics
+ * collected, and then invokes the lpfc_sli_issue_iocb() routine to send ACC
+ * response to the RPS.
+ *
+ * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
+ * will be incremented by 1 for holding the ndlp and the reference to ndlp
+ * will be stored into the context1 field of the IOCB for the completion
+ * callback function to the RPS Accept Response ELS IOCB command.
+ *
+ **/
 static void
 lpfc_els_rsp_rps_acc(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
 {
@@ -3531,6 +4457,24 @@ lpfc_els_rsp_rps_acc(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
         return;
 }
 
+/**
+ * lpfc_els_rcv_rps: Process an unsolicited rps iocb.
+ * @vport: pointer to a host virtual N_Port data structure.
+ * @cmdiocb: pointer to lpfc command iocb data structure.
+ * @ndlp: pointer to a node-list data structure.
+ *
+ * This routine processes Read Port Status (RPS) IOCB received as an
+ * ELS unsolicited event. It first checks the remote port state. If the
+ * remote port is not in NLP_STE_UNMAPPED_NODE state or NLP_STE_MAPPED_NODE
+ * state, it invokes the lpfc_els_rsp_reject() routine to send the reject
+ * response. Otherwise, it issue the MBX_READ_LNK_STAT mailbox command
+ * for reading the HBA link statistics. It is for the callback function,
+ * lpfc_els_rsp_rps_acc(), set to the MBX_READ_LNK_STAT mailbox command
+ * to actually sending out RPS Accept (ACC) response.
+ *
+ * Return codes
+ *   0 - Successfully processed rps iocb (currently always return 0)
+ **/
 static int
 lpfc_els_rcv_rps(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
                  struct lpfc_nodelist *ndlp)
@@ -3544,14 +4488,9 @@ lpfc_els_rcv_rps(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
         struct ls_rjt stat;
 
         if ((ndlp->nlp_state != NLP_STE_UNMAPPED_NODE) &&
-            (ndlp->nlp_state != NLP_STE_MAPPED_NODE)) {
-                stat.un.b.lsRjtRsvd0 = 0;
-                stat.un.b.lsRjtRsnCode = LSRJT_UNABLE_TPC;
-                stat.un.b.lsRjtRsnCodeExp = LSEXP_CANT_GIVE_DATA;
-                stat.un.b.vendorUnique = 0;
-                lpfc_els_rsp_reject(vport, stat.un.lsRjtError, cmdiocb, ndlp,
-                        NULL);
-        }
+            (ndlp->nlp_state != NLP_STE_MAPPED_NODE))
+                /* reject the unsolicited RPS request and done with it */
+                goto reject_out;
 
         pcmd = (struct lpfc_dmabuf *) cmdiocb->context2;
         lp = (uint32_t *) pcmd->virt;
@@ -3584,6 +4523,9 @@ lpfc_els_rcv_rps(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
                         mempool_free(mbox, phba->mbox_mem_pool);
                 }
         }
+
+reject_out:
+        /* issue rejection response */
         stat.un.b.lsRjtRsvd0 = 0;
         stat.un.b.lsRjtRsnCode = LSRJT_UNABLE_TPC;
         stat.un.b.lsRjtRsnCodeExp = LSEXP_CANT_GIVE_DATA;
@@ -3592,6 +4534,25 @@ lpfc_els_rcv_rps(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
         return 0;
 }
 
+/**
+ * lpfc_els_rsp_rpl_acc: Issue an accept rpl els command.
+ * @vport: pointer to a host virtual N_Port data structure.
+ * @cmdsize: size of the ELS command.
+ * @oldiocb: pointer to the original lpfc command iocb data structure.
+ * @ndlp: pointer to a node-list data structure.
+ *
+ * This routine issuees an Accept (ACC) Read Port List (RPL) ELS command.
+ * It is to be called by the lpfc_els_rcv_rpl() routine to accept the RPL.
+ *
+ * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
+ * will be incremented by 1 for holding the ndlp and the reference to ndlp
+ * will be stored into the context1 field of the IOCB for the completion
+ * callback function to the RPL Accept Response ELS command.
+ *
+ * Return code
+ *   0 - Successfully issued ACC RPL ELS command
+ *   1 - Failed to issue ACC RPL ELS command
+ **/
 static int
 lpfc_els_rsp_rpl_acc(struct lpfc_vport *vport, uint16_t cmdsize,
                      struct lpfc_iocbq *oldiocb, struct lpfc_nodelist *ndlp)
@@ -3645,6 +4606,22 @@ lpfc_els_rsp_rpl_acc(struct lpfc_vport *vport, uint16_t cmdsize,
         return 0;
 }
 
+/**
+ * lpfc_els_rcv_rpl: Process an unsolicited rpl iocb.
+ * @vport: pointer to a host virtual N_Port data structure.
+ * @cmdiocb: pointer to lpfc command iocb data structure.
+ * @ndlp: pointer to a node-list data structure.
+ *
+ * This routine processes Read Port List (RPL) IOCB received as an ELS
+ * unsolicited event. It first checks the remote port state. If the remote
+ * port is not in NLP_STE_UNMAPPED_NODE and NLP_STE_MAPPED_NODE states, it
+ * invokes the lpfc_els_rsp_reject() routine to send reject response.
+ * Otherwise, this routine then invokes the lpfc_els_rsp_rpl_acc() routine
+ * to accept the RPL.
+ *
+ * Return code
+ *   0 - Successfully processed rpl iocb (currently always return 0)
+ **/
 static int
 lpfc_els_rcv_rpl(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
                  struct lpfc_nodelist *ndlp)
@@ -3658,12 +4635,15 @@ lpfc_els_rcv_rpl(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
 
         if ((ndlp->nlp_state != NLP_STE_UNMAPPED_NODE) &&
             (ndlp->nlp_state != NLP_STE_MAPPED_NODE)) {
+                /* issue rejection response */
                 stat.un.b.lsRjtRsvd0 = 0;
                 stat.un.b.lsRjtRsnCode = LSRJT_UNABLE_TPC;
                 stat.un.b.lsRjtRsnCodeExp = LSEXP_CANT_GIVE_DATA;
                 stat.un.b.vendorUnique = 0;
                 lpfc_els_rsp_reject(vport, stat.un.lsRjtError, cmdiocb, ndlp,
                         NULL);
+                /* rejected the unsolicited RPL request and done with it */
+                return 0;
         }
 
         pcmd = (struct lpfc_dmabuf *) cmdiocb->context2;
@@ -3685,6 +4665,30 @@ lpfc_els_rcv_rpl(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
         return 0;
 }
 
+/**
+ * lpfc_els_rcv_farp: Process an unsolicited farp request els command.
+ * @vport: pointer to a virtual N_Port data structure.
+ * @cmdiocb: pointer to lpfc command iocb data structure.
+ * @ndlp: pointer to a node-list data structure.
+ *
+ * This routine processes Fibre Channel Address Resolution Protocol
+ * (FARP) Request IOCB received as an ELS unsolicited event. Currently,
+ * the lpfc driver only supports matching on WWPN or WWNN for FARP. As such,
+ * FARP_MATCH_PORT flag and FARP_MATCH_NODE flag are checked against the
+ * Match Flag in the FARP request IOCB: if FARP_MATCH_PORT flag is set, the
+ * remote PortName is compared against the FC PortName stored in the @vport
+ * data structure; if FARP_MATCH_NODE flag is set, the remote NodeName is
+ * compared against the FC NodeName stored in the @vport data structure.
+ * If any of these matches and the FARP_REQUEST_FARPR flag is set in the
+ * FARP request IOCB Response Flag, the lpfc_issue_els_farpr() routine is
+ * invoked to send out FARP Response to the remote node. Before sending the
+ * FARP Response, however, the FARP_REQUEST_PLOGI flag is check in the FARP
+ * request IOCB Response Flag and, if it is set, the lpfc_issue_els_plogi()
+ * routine is invoked to log into the remote port first.
+ *
+ * Return code
+ *   0 - Either the FARP Match Mode not supported or successfully processed
+ **/
 static int
 lpfc_els_rcv_farp(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
                   struct lpfc_nodelist *ndlp)
@@ -3744,6 +4748,20 @@ lpfc_els_rcv_farp(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
         return 0;
 }
 
+/**
+ * lpfc_els_rcv_farpr: Process an unsolicited farp response iocb.
+ * @vport: pointer to a host virtual N_Port data structure.
+ * @cmdiocb: pointer to lpfc command iocb data structure.
+ * @ndlp: pointer to a node-list data structure.
+ *
+ * This routine processes Fibre Channel Address Resolution Protocol
+ * Response (FARPR) IOCB received as an ELS unsolicited event. It simply
+ * invokes the lpfc_els_rsp_acc() routine to the remote node to accept
+ * the FARP response request.
+ *
+ * Return code
+ *   0 - Successfully processed FARPR IOCB (currently always return 0)
+ **/
 static int
 lpfc_els_rcv_farpr(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
                    struct lpfc_nodelist  *ndlp)
@@ -3768,6 +4786,25 @@ lpfc_els_rcv_farpr(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
         return 0;
 }
 
+/**
+ * lpfc_els_rcv_fan: Process an unsolicited fan iocb command.
+ * @vport: pointer to a host virtual N_Port data structure.
+ * @cmdiocb: pointer to lpfc command iocb data structure.
+ * @fan_ndlp: pointer to a node-list data structure.
+ *
+ * This routine processes a Fabric Address Notification (FAN) IOCB
+ * command received as an ELS unsolicited event. The FAN ELS command will
+ * only be processed on a physical port (i.e., the @vport represents the
+ * physical port). The fabric NodeName and PortName from the FAN IOCB are
+ * compared against those in the phba data structure. If any of those is
+ * different, the lpfc_initial_flogi() routine is invoked to initialize
+ * Fabric Login (FLOGI) to the fabric to start the discover over. Otherwise,
+ * if both of those are identical, the lpfc_issue_fabric_reglogin() routine
+ * is invoked to register login to the fabric.
+ *
+ * Return code
+ *   0 - Successfully processed fan iocb (currently always return 0).
+ **/
 static int
 lpfc_els_rcv_fan(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
                  struct lpfc_nodelist *fan_ndlp)
@@ -3797,6 +4834,16 @@ lpfc_els_rcv_fan(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
         return 0;
 }
 
+/**
+ * lpfc_els_timeout: Handler funciton to the els timer.
+ * @ptr: holder for the timer function associated data.
+ *
+ * This routine is invoked by the ELS timer after timeout. It posts the ELS
+ * timer timeout event by setting the WORKER_ELS_TMO bit to the work port
+ * event bitmap and then invokes the lpfc_worker_wake_up() routine to wake
+ * up the worker thread. It is for the worker thread to invoke the routine
+ * lpfc_els_timeout_handler() to work on the posted event WORKER_ELS_TMO.
+ **/
 void
 lpfc_els_timeout(unsigned long ptr)
 {
@@ -3816,6 +4863,15 @@ lpfc_els_timeout(unsigned long ptr)
         return;
 }
 
+/**
+ * lpfc_els_timeout_handler: Process an els timeout event.
+ * @vport: pointer to a virtual N_Port data structure.
+ *
+ * This routine is the actual handler function that processes an ELS timeout
+ * event. It walks the ELS ring to get and abort all the IOCBs (except the
+ * ABORT/CLOSE/FARP/FARPR/FDISC), which are associated with the @vport by
+ * invoking the lpfc_sli_issue_abort_iotag() routine.
+ **/
 void
 lpfc_els_timeout_handler(struct lpfc_vport *vport)
 {
@@ -3886,6 +4942,26 @@ lpfc_els_timeout_handler(struct lpfc_vport *vport)
                 mod_timer(&vport->els_tmofunc, jiffies + HZ * timeout);
 }
 
+/**
+ * lpfc_els_flush_cmd: Clean up the outstanding els commands to a vport.
+ * @vport: pointer to a host virtual N_Port data structure.
+ *
+ * This routine is used to clean up all the outstanding ELS commands on a
+ * @vport. It first aborts the @vport by invoking lpfc_fabric_abort_vport()
+ * routine. After that, it walks the ELS transmit queue to remove all the
+ * IOCBs with the @vport other than the QUE_RING and ABORT/CLOSE IOCBs. For
+ * the IOCBs with a non-NULL completion callback function, the callback
+ * function will be invoked with the status set to IOSTAT_LOCAL_REJECT and
+ * un.ulpWord[4] set to IOERR_SLI_ABORTED. For IOCBs with a NULL completion
+ * callback function, the IOCB will simply be released. Finally, it walks
+ * the ELS transmit completion queue to issue an abort IOCB to any transmit
+ * completion queue IOCB that is associated with the @vport and is not
+ * an IOCB from libdfc (i.e., the management plane IOCBs that are not
+ * part of the discovery state machine) out to HBA by invoking the
+ * lpfc_sli_issue_abort_iotag() routine. Note that this function issues the
+ * abort IOCB to any transmit completion queueed IOCB, it does not guarantee
+ * the IOCBs are aborted when this function returns.
+ **/
 void
 lpfc_els_flush_cmd(struct lpfc_vport *vport)
 {
@@ -3948,6 +5024,23 @@ lpfc_els_flush_cmd(struct lpfc_vport *vport)
         return;
 }
 
+/**
+ * lpfc_els_flush_all_cmd: Clean up all the outstanding els commands to a HBA.
+ * @phba: pointer to lpfc hba data structure.
+ *
+ * This routine is used to clean up all the outstanding ELS commands on a
+ * @phba. It first aborts the @phba by invoking the lpfc_fabric_abort_hba()
+ * routine. After that, it walks the ELS transmit queue to remove all the
+ * IOCBs to the @phba other than the QUE_RING and ABORT/CLOSE IOCBs. For
+ * the IOCBs with the completion callback function associated, the callback
+ * function will be invoked with the status set to IOSTAT_LOCAL_REJECT and
+ * un.ulpWord[4] set to IOERR_SLI_ABORTED. For IOCBs without the completion
+ * callback function associated, the IOCB will simply be released. Finally,
+ * it walks the ELS transmit completion queue to issue an abort IOCB to any
+ * transmit completion queue IOCB that is not an IOCB from libdfc (i.e., the
+ * management plane IOCBs that are not part of the discovery state machine)
+ * out to HBA by invoking the lpfc_sli_issue_abort_iotag() routine.
+ **/
 void
 lpfc_els_flush_all_cmd(struct lpfc_hba  *phba)
 {
@@ -3992,6 +5085,130 @@ lpfc_els_flush_all_cmd(struct lpfc_hba  *phba)
         return;
 }
 
+/**
+ * lpfc_send_els_failure_event: Posts an ELS command failure event.
+ * @phba: Pointer to hba context object.
+ * @cmdiocbp: Pointer to command iocb which reported error.
+ * @rspiocbp: Pointer to response iocb which reported error.
+ *
+ * This function sends an event when there is an ELS command
+ * failure.
+ **/
+void
+lpfc_send_els_failure_event(struct lpfc_hba *phba,
+                        struct lpfc_iocbq *cmdiocbp,
+                        struct lpfc_iocbq *rspiocbp)
+{
+        struct lpfc_vport *vport = cmdiocbp->vport;
+        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
+        struct lpfc_lsrjt_event lsrjt_event;
+        struct lpfc_fabric_event_header fabric_event;
+        struct ls_rjt stat;
+        struct lpfc_nodelist *ndlp;
+        uint32_t *pcmd;
+
+        ndlp = cmdiocbp->context1;
+        if (!ndlp || !NLP_CHK_NODE_ACT(ndlp))
+                return;
+
+        if (rspiocbp->iocb.ulpStatus == IOSTAT_LS_RJT) {
+                lsrjt_event.header.event_type = FC_REG_ELS_EVENT;
+                lsrjt_event.header.subcategory = LPFC_EVENT_LSRJT_RCV;
+                memcpy(lsrjt_event.header.wwpn, &ndlp->nlp_portname,
+                        sizeof(struct lpfc_name));
+                memcpy(lsrjt_event.header.wwnn, &ndlp->nlp_nodename,
+                        sizeof(struct lpfc_name));
+                pcmd = (uint32_t *) (((struct lpfc_dmabuf *)
+                        cmdiocbp->context2)->virt);
+                lsrjt_event.command = *pcmd;
+                stat.un.lsRjtError = be32_to_cpu(rspiocbp->iocb.un.ulpWord[4]);
+                lsrjt_event.reason_code = stat.un.b.lsRjtRsnCode;
+                lsrjt_event.explanation = stat.un.b.lsRjtRsnCodeExp;
+                fc_host_post_vendor_event(shost,
+                        fc_get_event_number(),
+                        sizeof(lsrjt_event),
+                        (char *)&lsrjt_event,
+                        SCSI_NL_VID_TYPE_PCI | PCI_VENDOR_ID_EMULEX);
+                return;
+        }
+        if ((rspiocbp->iocb.ulpStatus == IOSTAT_NPORT_BSY) ||
+                (rspiocbp->iocb.ulpStatus == IOSTAT_FABRIC_BSY)) {
+                fabric_event.event_type = FC_REG_FABRIC_EVENT;
+                if (rspiocbp->iocb.ulpStatus == IOSTAT_NPORT_BSY)
+                        fabric_event.subcategory = LPFC_EVENT_PORT_BUSY;
+                else
+                        fabric_event.subcategory = LPFC_EVENT_FABRIC_BUSY;
+                memcpy(fabric_event.wwpn, &ndlp->nlp_portname,
+                        sizeof(struct lpfc_name));
+                memcpy(fabric_event.wwnn, &ndlp->nlp_nodename,
+                        sizeof(struct lpfc_name));
+                fc_host_post_vendor_event(shost,
+                        fc_get_event_number(),
+                        sizeof(fabric_event),
+                        (char *)&fabric_event,
+                        SCSI_NL_VID_TYPE_PCI | PCI_VENDOR_ID_EMULEX);
+                return;
+        }
+
+}
+
+/**
+ * lpfc_send_els_event: Posts unsolicited els event.
+ * @vport: Pointer to vport object.
+ * @ndlp: Pointer FC node object.
+ * @cmd: ELS command code.
+ *
+ * This function posts an event when there is an incoming
+ * unsolicited ELS command.
+ **/
+static void
+lpfc_send_els_event(struct lpfc_vport *vport,
+                    struct lpfc_nodelist *ndlp,
+                    uint32_t cmd)
+{
+        struct lpfc_els_event_header els_data;
+        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
+
+        els_data.event_type = FC_REG_ELS_EVENT;
+        switch (cmd) {
+        case ELS_CMD_PLOGI:
+                els_data.subcategory = LPFC_EVENT_PLOGI_RCV;
+                break;
+        case ELS_CMD_PRLO:
+                els_data.subcategory = LPFC_EVENT_PRLO_RCV;
+                break;
+        case ELS_CMD_ADISC:
+                els_data.subcategory = LPFC_EVENT_ADISC_RCV;
+                break;
+        default:
+                return;
+        }
+        memcpy(els_data.wwpn, &ndlp->nlp_portname, sizeof(struct lpfc_name));
+        memcpy(els_data.wwnn, &ndlp->nlp_nodename, sizeof(struct lpfc_name));
+        fc_host_post_vendor_event(shost,
+                fc_get_event_number(),
+                sizeof(els_data),
+                (char *)&els_data,
+                SCSI_NL_VID_TYPE_PCI | PCI_VENDOR_ID_EMULEX);
+
+        return;
+}
+
+
+/**
+ * lpfc_els_unsol_buffer: Process an unsolicited event data buffer.
+ * @phba: pointer to lpfc hba data structure.
+ * @pring: pointer to a SLI ring.
+ * @vport: pointer to a host virtual N_Port data structure.
+ * @elsiocb: pointer to lpfc els command iocb data structure.
+ *
+ * This routine is used for processing the IOCB associated with a unsolicited
+ * event. It first determines whether there is an existing ndlp that matches
+ * the DID from the unsolicited IOCB. If not, it will create a new one with
+ * the DID from the unsolicited IOCB. The ELS command from the unsolicited
+ * IOCB is then used to invoke the proper routine and to set up proper state
+ * of the discovery state machine.
+ **/
 static void
 lpfc_els_unsol_buffer(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                       struct lpfc_vport *vport, struct lpfc_iocbq *elsiocb)
@@ -4059,8 +5276,6 @@ lpfc_els_unsol_buffer(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
         }
 
         phba->fc_stat.elsRcvFrame++;
-        if (elsiocb->context1)
-                lpfc_nlp_put(elsiocb->context1);
 
         elsiocb->context1 = lpfc_nlp_get(ndlp);
         elsiocb->vport = vport;
@@ -4081,6 +5296,7 @@ lpfc_els_unsol_buffer(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                 phba->fc_stat.elsRcvPLOGI++;
                 ndlp = lpfc_plogi_confirm_nport(phba, payload, ndlp);
 
+                lpfc_send_els_event(vport, ndlp, cmd);
                 if (vport->port_state < LPFC_DISC_AUTH) {
                         if (!(phba->pport->fc_flag & FC_PT2PT) ||
                                 (phba->pport->fc_flag & FC_PT2PT_PLOGI)) {
@@ -4130,6 +5346,7 @@ lpfc_els_unsol_buffer(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                         did, vport->port_state, ndlp->nlp_flag);
 
                 phba->fc_stat.elsRcvPRLO++;
+                lpfc_send_els_event(vport, ndlp, cmd);
                 if (vport->port_state < LPFC_DISC_AUTH) {
                         rjt_err = LSRJT_UNABLE_TPC;
                         break;
@@ -4147,6 +5364,7 @@ lpfc_els_unsol_buffer(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                         "RCV ADISC:       did:x%x/ste:x%x flg:x%x",
                         did, vport->port_state, ndlp->nlp_flag);
 
+                lpfc_send_els_event(vport, ndlp, cmd);
                 phba->fc_stat.elsRcvADISC++;
                 if (vport->port_state < LPFC_DISC_AUTH) {
                         rjt_err = LSRJT_UNABLE_TPC;
@@ -4270,6 +5488,8 @@ lpfc_els_unsol_buffer(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                         NULL);
         }
 
+        lpfc_nlp_put(elsiocb->context1);
+        elsiocb->context1 = NULL;
         return;
 
 dropit:
@@ -4282,6 +5502,19 @@ dropit:
         phba->fc_stat.elsRcvDrop++;
 }
 
+/**
+ * lpfc_find_vport_by_vpid: Find a vport on a HBA through vport identifier.
+ * @phba: pointer to lpfc hba data structure.
+ * @vpi: host virtual N_Port identifier.
+ *
+ * This routine finds a vport on a HBA (referred by @phba) through a
+ * @vpi. The function walks the HBA's vport list and returns the address
+ * of the vport with the matching @vpi.
+ *
+ * Return code
+ *    NULL - No vport with the matching @vpi found
+ *    Otherwise - Address to the vport with the matching @vpi.
+ **/
 static struct lpfc_vport *
 lpfc_find_vport_by_vpid(struct lpfc_hba *phba, uint16_t vpi)
 {
@@ -4299,6 +5532,18 @@ lpfc_find_vport_by_vpid(struct lpfc_hba *phba, uint16_t vpi)
         return NULL;
 }
 
+/**
+ * lpfc_els_unsol_event: Process an unsolicited event from an els sli ring.
+ * @phba: pointer to lpfc hba data structure.
+ * @pring: pointer to a SLI ring.
+ * @elsiocb: pointer to lpfc els iocb data structure.
+ *
+ * This routine is used to process an unsolicited event received from a SLI
+ * (Service Level Interface) ring. The actual processing of the data buffer
+ * associated with the unsolicited event is done by invoking the routine
+ * lpfc_els_unsol_buffer() after properly set up the iocb buffer from the
+ * SLI ring on which the unsolicited event was received.
+ **/
 void
 lpfc_els_unsol_event(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                      struct lpfc_iocbq *elsiocb)
@@ -4309,6 +5554,7 @@ lpfc_els_unsol_event(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
         struct lpfc_dmabuf *bdeBuf1 = elsiocb->context2;
         struct lpfc_dmabuf *bdeBuf2 = elsiocb->context3;
 
+        elsiocb->context1 = NULL;
         elsiocb->context2 = NULL;
         elsiocb->context3 = NULL;
 
@@ -4356,8 +5602,6 @@ lpfc_els_unsol_event(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
          * The different unsolicited event handlers would tell us
          * if they are done with "mp" by setting context2 to NULL.
          */
-        lpfc_nlp_put(elsiocb->context1);
-        elsiocb->context1 = NULL;
         if (elsiocb->context2) {
                 lpfc_in_buf_free(phba, (struct lpfc_dmabuf *)elsiocb->context2);
                 elsiocb->context2 = NULL;
@@ -4376,6 +5620,19 @@ lpfc_els_unsol_event(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
         }
 }
 
+/**
+ * lpfc_do_scr_ns_plogi: Issue a plogi to the name server for scr.
+ * @phba: pointer to lpfc hba data structure.
+ * @vport: pointer to a virtual N_Port data structure.
+ *
+ * This routine issues a Port Login (PLOGI) to the Name Server with
+ * State Change Request (SCR) for a @vport. This routine will create an
+ * ndlp for the Name Server associated to the @vport if such node does
+ * not already exist. The PLOGI to Name Server is issued by invoking the
+ * lpfc_issue_els_plogi() routine. If Fabric-Device Management Interface
+ * (FDMI) is configured to the @vport, a FDMI node will be created and
+ * the PLOGI to FDMI is issued by invoking lpfc_issue_els_plogi() routine.
+ **/
 void
 lpfc_do_scr_ns_plogi(struct lpfc_hba *phba, struct lpfc_vport *vport)
 {
@@ -4434,6 +5691,18 @@ lpfc_do_scr_ns_plogi(struct lpfc_hba *phba, struct lpfc_vport *vport)
         return;
 }
 
+/**
+ * lpfc_cmpl_reg_new_vport: Completion callback function to register new vport.
+ * @phba: pointer to lpfc hba data structure.
+ * @pmb: pointer to the driver internal queue element for mailbox command.
+ *
+ * This routine is the completion callback function to register new vport
+ * mailbox command. If the new vport mailbox command completes successfully,
+ * the fabric registration login shall be performed on physical port (the
+ * new vport created is actually a physical port, with VPI 0) or the port
+ * login to Name Server for State Change Request (SCR) will be performed
+ * on virtual port (real virtual port, with VPI greater than 0).
+ **/
 static void
 lpfc_cmpl_reg_new_vport(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
 {
@@ -4491,6 +5760,15 @@ lpfc_cmpl_reg_new_vport(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
         return;
 }
 
+/**
+ * lpfc_register_new_vport: Register a new vport with a HBA.
+ * @phba: pointer to lpfc hba data structure.
+ * @vport: pointer to a host virtual N_Port data structure.
+ * @ndlp: pointer to a node-list data structure.
+ *
+ * This routine registers the @vport as a new virtual port with a HBA.
+ * It is done through a registering vpi mailbox command.
+ **/
 static void
 lpfc_register_new_vport(struct lpfc_hba *phba, struct lpfc_vport *vport,
                         struct lpfc_nodelist *ndlp)
@@ -4531,6 +5809,26 @@ mbox_err_exit:
         return;
 }
 
+/**
+ * lpfc_cmpl_els_fdisc: Completion function for fdisc iocb command.
+ * @phba: pointer to lpfc hba data structure.
+ * @cmdiocb: pointer to lpfc command iocb data structure.
+ * @rspiocb: pointer to lpfc response iocb data structure.
+ *
+ * This routine is the completion callback function to a Fabric Discover
+ * (FDISC) ELS command. Since all the FDISC ELS commands are issued
+ * single threaded, each FDISC completion callback function will reset
+ * the discovery timer for all vports such that the timers will not get
+ * unnecessary timeout. The function checks the FDISC IOCB status. If error
+ * detected, the vport will be set to FC_VPORT_FAILED state. Otherwise,the
+ * vport will set to FC_VPORT_ACTIVE state. It then checks whether the DID
+ * assigned to the vport has been changed with the completion of the FDISC
+ * command. If so, both RPI (Remote Port Index) and VPI (Virtual Port Index)
+ * are unregistered from the HBA, and then the lpfc_register_new_vport()
+ * routine is invoked to register new vport with the HBA. Otherwise, the
+ * lpfc_do_scr_ns_plogi() routine is invoked to issue a PLOGI to the Name
+ * Server for State Change Request (SCR).
+ **/
 static void
 lpfc_cmpl_els_fdisc(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                     struct lpfc_iocbq *rspiocb)
@@ -4565,58 +5863,80 @@ lpfc_cmpl_els_fdisc(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                         goto out;
                 /* FDISC failed */
                 lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
-                                 "0124 FDISC failed. (%d/%d)\n",
+                                 "0126 FDISC failed. (%d/%d)\n",
                                  irsp->ulpStatus, irsp->un.ulpWord[4]);
+                goto fdisc_failed;
+        }
                 if (vport->fc_vport->vport_state == FC_VPORT_INITIALIZING)
                         lpfc_vport_set_state(vport, FC_VPORT_FAILED);
                 lpfc_nlp_put(ndlp);
                 /* giving up on FDISC. Cancel discovery timer */
                 lpfc_can_disctmo(vport);
-        } else {
-                spin_lock_irq(shost->host_lock);
-                vport->fc_flag |= FC_FABRIC;
-                if (vport->phba->fc_topology == TOPOLOGY_LOOP)
-                        vport->fc_flag |=  FC_PUBLIC_LOOP;
-                spin_unlock_irq(shost->host_lock);
+        spin_lock_irq(shost->host_lock);
+        vport->fc_flag |= FC_FABRIC;
+        if (vport->phba->fc_topology == TOPOLOGY_LOOP)
+                vport->fc_flag |=  FC_PUBLIC_LOOP;
+        spin_unlock_irq(shost->host_lock);
 
-                vport->fc_myDID = irsp->un.ulpWord[4] & Mask_DID;
-                lpfc_vport_set_state(vport, FC_VPORT_ACTIVE);
-                if ((vport->fc_prevDID != vport->fc_myDID) &&
-                        !(vport->fc_flag & FC_VPORT_NEEDS_REG_VPI)) {
-                        /* If our NportID changed, we need to ensure all
-                         * remaining NPORTs get unreg_login'ed so we can
-                         * issue unreg_vpi.
-                         */
-                        list_for_each_entry_safe(np, next_np,
-                                &vport->fc_nodes, nlp_listp) {
-                                if (!NLP_CHK_NODE_ACT(ndlp) ||
-                                    (np->nlp_state != NLP_STE_NPR_NODE) ||
-                                    !(np->nlp_flag & NLP_NPR_ADISC))
-                                        continue;
-                                spin_lock_irq(shost->host_lock);
-                                np->nlp_flag &= ~NLP_NPR_ADISC;
-                                spin_unlock_irq(shost->host_lock);
-                                lpfc_unreg_rpi(vport, np);
-                        }
-                        lpfc_mbx_unreg_vpi(vport);
+        vport->fc_myDID = irsp->un.ulpWord[4] & Mask_DID;
+        lpfc_vport_set_state(vport, FC_VPORT_ACTIVE);
+        if ((vport->fc_prevDID != vport->fc_myDID) &&
+                !(vport->fc_flag & FC_VPORT_NEEDS_REG_VPI)) {
+                /* If our NportID changed, we need to ensure all
+                 * remaining NPORTs get unreg_login'ed so we can
+                 * issue unreg_vpi.
+                 */
+                list_for_each_entry_safe(np, next_np,
+                        &vport->fc_nodes, nlp_listp) {
+                        if (!NLP_CHK_NODE_ACT(ndlp) ||
+                            (np->nlp_state != NLP_STE_NPR_NODE) ||
+                            !(np->nlp_flag & NLP_NPR_ADISC))
+                                continue;
                         spin_lock_irq(shost->host_lock);
-                        vport->fc_flag |= FC_VPORT_NEEDS_REG_VPI;
+                        np->nlp_flag &= ~NLP_NPR_ADISC;
                         spin_unlock_irq(shost->host_lock);
+                        lpfc_unreg_rpi(vport, np);
                 }
-
-                if (vport->fc_flag & FC_VPORT_NEEDS_REG_VPI)
-                        lpfc_register_new_vport(phba, vport, ndlp);
-                else
-                        lpfc_do_scr_ns_plogi(phba, vport);
-
-                /* Unconditionaly kick off releasing fabric node for vports */
-                lpfc_nlp_put(ndlp);
+                lpfc_mbx_unreg_vpi(vport);
+                spin_lock_irq(shost->host_lock);
+                vport->fc_flag |= FC_VPORT_NEEDS_REG_VPI;
+                spin_unlock_irq(shost->host_lock);
         }
 
+        if (vport->fc_flag & FC_VPORT_NEEDS_REG_VPI)
+                lpfc_register_new_vport(phba, vport, ndlp);
+        else
+                lpfc_do_scr_ns_plogi(phba, vport);
+        goto out;
+fdisc_failed:
+        lpfc_vport_set_state(vport, FC_VPORT_FAILED);
+        /* Cancel discovery timer */
+        lpfc_can_disctmo(vport);
+        lpfc_nlp_put(ndlp);
 out:
         lpfc_els_free_iocb(phba, cmdiocb);
 }
 
+/**
+ * lpfc_issue_els_fdisc: Issue a fdisc iocb command.
+ * @vport: pointer to a virtual N_Port data structure.
+ * @ndlp: pointer to a node-list data structure.
+ * @retry: number of retries to the command IOCB.
+ *
+ * This routine prepares and issues a Fabric Discover (FDISC) IOCB to
+ * a remote node (@ndlp) off a @vport. It uses the lpfc_issue_fabric_iocb()
+ * routine to issue the IOCB, which makes sure only one outstanding fabric
+ * IOCB will be sent off HBA at any given time.
+ *
+ * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
+ * will be incremented by 1 for holding the ndlp and the reference to ndlp
+ * will be stored into the context1 field of the IOCB for the completion
+ * callback function to the FDISC ELS command.
+ *
+ * Return code
+ *   0 - Successfully issued fdisc iocb command
+ *   1 - Failed to issue fdisc iocb command
+ **/
 static int
 lpfc_issue_els_fdisc(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                      uint8_t retry)
@@ -4691,6 +6011,20 @@ lpfc_issue_els_fdisc(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
         return 0;
 }
 
+/**
+ * lpfc_cmpl_els_npiv_logo: Completion function with vport logo.
+ * @phba: pointer to lpfc hba data structure.
+ * @cmdiocb: pointer to lpfc command iocb data structure.
+ * @rspiocb: pointer to lpfc response iocb data structure.
+ *
+ * This routine is the completion callback function to the issuing of a LOGO
+ * ELS command off a vport. It frees the command IOCB and then decrement the
+ * reference count held on ndlp for this completion function, indicating that
+ * the reference to the ndlp is no long needed. Note that the
+ * lpfc_els_free_iocb() routine decrements the ndlp reference held for this
+ * callback function and an additional explicit ndlp reference decrementation
+ * will trigger the actual release of the ndlp.
+ **/
 static void
 lpfc_cmpl_els_npiv_logo(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                         struct lpfc_iocbq *rspiocb)
@@ -4712,6 +6046,22 @@ lpfc_cmpl_els_npiv_logo(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
         lpfc_nlp_put(ndlp);
 }
 
+/**
+ * lpfc_issue_els_npiv_logo: Issue a logo off a vport.
+ * @vport: pointer to a virtual N_Port data structure.
+ * @ndlp: pointer to a node-list data structure.
+ *
+ * This routine issues a LOGO ELS command to an @ndlp off a @vport.
+ *
+ * Note that, in lpfc_prep_els_iocb() routine, the reference count of ndlp
+ * will be incremented by 1 for holding the ndlp and the reference to ndlp
+ * will be stored into the context1 field of the IOCB for the completion
+ * callback function to the LOGO ELS command.
+ *
+ * Return codes
+ *   0 - Successfully issued logo off the @vport
+ *   1 - Failed to issue logo off the @vport
+ **/
 int
 lpfc_issue_els_npiv_logo(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp)
 {
@@ -4757,6 +6107,17 @@ lpfc_issue_els_npiv_logo(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp)
         return 0;
 }
 
+/**
+ * lpfc_fabric_block_timeout: Handler function to the fabric block timer.
+ * @ptr: holder for the timer function associated data.
+ *
+ * This routine is invoked by the fabric iocb block timer after
+ * timeout. It posts the fabric iocb block timeout event by setting the
+ * WORKER_FABRIC_BLOCK_TMO bit to work port event bitmap and then invokes
+ * lpfc_worker_wake_up() routine to wake up the worker thread. It is for
+ * the worker thread to invoke the lpfc_unblock_fabric_iocbs() on the
+ * posted event WORKER_FABRIC_BLOCK_TMO.
+ **/
 void
 lpfc_fabric_block_timeout(unsigned long ptr)
 {
@@ -4775,6 +6136,16 @@ lpfc_fabric_block_timeout(unsigned long ptr)
         return;
 }
 
+/**
+ * lpfc_resume_fabric_iocbs: Issue a fabric iocb from driver internal list.
+ * @phba: pointer to lpfc hba data structure.
+ *
+ * This routine issues one fabric iocb from the driver internal list to
+ * the HBA. It first checks whether it's ready to issue one fabric iocb to
+ * the HBA (whether there is no outstanding fabric iocb). If so, it shall
+ * remove one pending fabric iocb from the driver internal list and invokes
+ * lpfc_sli_issue_iocb() routine to send the fabric iocb to the HBA.
+ **/
 static void
 lpfc_resume_fabric_iocbs(struct lpfc_hba *phba)
 {
@@ -4824,6 +6195,15 @@ repeat:
         return;
 }
 
+/**
+ * lpfc_unblock_fabric_iocbs: Unblock issuing fabric iocb command.
+ * @phba: pointer to lpfc hba data structure.
+ *
+ * This routine unblocks the  issuing fabric iocb command. The function
+ * will clear the fabric iocb block bit and then invoke the routine
+ * lpfc_resume_fabric_iocbs() to issue one of the pending fabric iocb
+ * from the driver internal fabric iocb list.
+ **/
 void
 lpfc_unblock_fabric_iocbs(struct lpfc_hba *phba)
 {
@@ -4833,6 +6213,15 @@ lpfc_unblock_fabric_iocbs(struct lpfc_hba *phba)
         return;
 }
 
+/**
+ * lpfc_block_fabric_iocbs: Block issuing fabric iocb command.
+ * @phba: pointer to lpfc hba data structure.
+ *
+ * This routine blocks the issuing fabric iocb for a specified amount of
+ * time (currently 100 ms). This is done by set the fabric iocb block bit
+ * and set up a timeout timer for 100ms. When the block bit is set, no more
+ * fabric iocb will be issued out of the HBA.
+ **/
 static void
 lpfc_block_fabric_iocbs(struct lpfc_hba *phba)
 {
@@ -4846,6 +6235,19 @@ lpfc_block_fabric_iocbs(struct lpfc_hba *phba)
         return;
 }
 
+/**
+ * lpfc_cmpl_fabric_iocb: Completion callback function for fabric iocb.
+ * @phba: pointer to lpfc hba data structure.
+ * @cmdiocb: pointer to lpfc command iocb data structure.
+ * @rspiocb: pointer to lpfc response iocb data structure.
+ *
+ * This routine is the callback function that is put to the fabric iocb's
+ * callback function pointer (iocb->iocb_cmpl). The original iocb's callback
+ * function pointer has been stored in iocb->fabric_iocb_cmpl. This callback
+ * function first restores and invokes the original iocb's callback function
+ * and then invokes the lpfc_resume_fabric_iocbs() routine to issue the next
+ * fabric bound iocb from the driver internal fabric iocb list onto the wire.
+ **/
 static void
 lpfc_cmpl_fabric_iocb(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
         struct lpfc_iocbq *rspiocb)
@@ -4892,6 +6294,30 @@ lpfc_cmpl_fabric_iocb(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
         }
 }
 
+/**
+ * lpfc_issue_fabric_iocb: Issue a fabric iocb command.
+ * @phba: pointer to lpfc hba data structure.
+ * @iocb: pointer to lpfc command iocb data structure.
+ *
+ * This routine is used as the top-level API for issuing a fabric iocb command
+ * such as FLOGI and FDISC. To accommodate certain switch fabric, this driver
+ * function makes sure that only one fabric bound iocb will be outstanding at
+ * any given time. As such, this function will first check to see whether there
+ * is already an outstanding fabric iocb on the wire. If so, it will put the
+ * newly issued iocb onto the driver internal fabric iocb list, waiting to be
+ * issued later. Otherwise, it will issue the iocb on the wire and update the
+ * fabric iocb count it indicate that there is one fabric iocb on the wire.
+ *
+ * Note, this implementation has a potential sending out fabric IOCBs out of
+ * order. The problem is caused by the construction of the "ready" boolen does
+ * not include the condition that the internal fabric IOCB list is empty. As
+ * such, it is possible a fabric IOCB issued by this routine might be "jump"
+ * ahead of the fabric IOCBs in the internal list.
+ *
+ * Return code
+ *   IOCB_SUCCESS - either fabric iocb put on the list or issued successfully
+ *   IOCB_ERROR - failed to issue fabric iocb
+ **/
 static int
 lpfc_issue_fabric_iocb(struct lpfc_hba *phba, struct lpfc_iocbq *iocb)
 {
@@ -4937,7 +6363,17 @@ lpfc_issue_fabric_iocb(struct lpfc_hba *phba, struct lpfc_iocbq *iocb)
         return ret;
 }
 
-
+/**
+ * lpfc_fabric_abort_vport: Abort a vport's iocbs from driver fabric iocb list.
+ * @vport: pointer to a virtual N_Port data structure.
+ *
+ * This routine aborts all the IOCBs associated with a @vport from the
+ * driver internal fabric IOCB list. The list contains fabric IOCBs to be
+ * issued to the ELS IOCB ring. This abort function walks the fabric IOCB
+ * list, removes each IOCB associated with the @vport off the list, set the
+ * status feild to IOSTAT_LOCAL_REJECT, and invokes the callback function
+ * associated with the IOCB.
+ **/
 static void lpfc_fabric_abort_vport(struct lpfc_vport *vport)
 {
         LIST_HEAD(completions);
@@ -4967,6 +6403,17 @@ static void lpfc_fabric_abort_vport(struct lpfc_vport *vport)
         }
 }
 
+/**
+ * lpfc_fabric_abort_nport: Abort a ndlp's iocbs from driver fabric iocb list.
+ * @ndlp: pointer to a node-list data structure.
+ *
+ * This routine aborts all the IOCBs associated with an @ndlp from the
+ * driver internal fabric IOCB list. The list contains fabric IOCBs to be
+ * issued to the ELS IOCB ring. This abort function walks the fabric IOCB
+ * list, removes each IOCB associated with the @ndlp off the list, set the
+ * status feild to IOSTAT_LOCAL_REJECT, and invokes the callback function
+ * associated with the IOCB.
+ **/
 void lpfc_fabric_abort_nport(struct lpfc_nodelist *ndlp)
 {
         LIST_HEAD(completions);
@@ -4996,6 +6443,17 @@ void lpfc_fabric_abort_nport(struct lpfc_nodelist *ndlp)
         }
 }
 
+/**
+ * lpfc_fabric_abort_hba: Abort all iocbs on driver fabric iocb list.
+ * @phba: pointer to lpfc hba data structure.
+ *
+ * This routine aborts all the IOCBs currently on the driver internal
+ * fabric IOCB list. The list contains fabric IOCBs to be issued to the ELS
+ * IOCB ring. This function takes the entire IOCB list off the fabric IOCB
+ * list, removes IOCBs off the list, set the status feild to
+ * IOSTAT_LOCAL_REJECT, and invokes the callback function associated with
+ * the IOCB.
+ **/
 void lpfc_fabric_abort_hba(struct lpfc_hba *phba)
 {
         LIST_HEAD(completions);
diff --git a/drivers/scsi/lpfc/lpfc_hbadisc.c b/drivers/scsi/lpfc/lpfc_hbadisc.c
index a98d11bf3576..a1a70d9ffc2a 100644
--- a/drivers/scsi/lpfc/lpfc_hbadisc.c
+++ b/drivers/scsi/lpfc/lpfc_hbadisc.c
@@ -30,6 +30,7 @@
 #include <scsi/scsi_transport_fc.h>
 
 #include "lpfc_hw.h"
+#include "lpfc_nl.h"
 #include "lpfc_disc.h"
 #include "lpfc_sli.h"
 #include "lpfc_scsi.h"
@@ -88,14 +89,6 @@ lpfc_terminate_rport_io(struct fc_rport *rport)
                         &phba->sli.ring[phba->sli.fcp_ring],
                         ndlp->nlp_sid, 0, LPFC_CTX_TGT);
         }
-
-        /*
-         * A device is normally blocked for rediscovery and unblocked when
-         * devloss timeout happens.  In case a vport is removed or driver
-         * unloaded before devloss timeout happens, we need to unblock here.
-         */
-        scsi_target_unblock(&rport->dev);
-        return;
 }
 
 /*
@@ -215,8 +208,16 @@ lpfc_dev_loss_tmo_handler(struct lpfc_nodelist *ndlp)
                 return;
         }
 
-        if (ndlp->nlp_state == NLP_STE_MAPPED_NODE)
+        if (ndlp->nlp_state == NLP_STE_MAPPED_NODE) {
+                lpfc_printf_vlog(vport, KERN_INFO, LOG_DISCOVERY,
+                                 "0284 Devloss timeout Ignored on "
+                                 "WWPN %x:%x:%x:%x:%x:%x:%x:%x "
+                                 "NPort x%x\n",
+                                 *name, *(name+1), *(name+2), *(name+3),
+                                 *(name+4), *(name+5), *(name+6), *(name+7),
+                                 ndlp->nlp_DID);
                 return;
+        }
 
         if (ndlp->nlp_type & NLP_FABRIC) {
                 /* We will clean up these Nodes in linkup */
@@ -237,8 +238,6 @@ lpfc_dev_loss_tmo_handler(struct lpfc_nodelist *ndlp)
                 lpfc_sli_abort_iocb(vport, &phba->sli.ring[phba->sli.fcp_ring],
                                     ndlp->nlp_sid, 0, LPFC_CTX_TGT);
         }
-        if (vport->load_flag & FC_UNLOADING)
-                warn_on = 0;
 
         if (warn_on) {
                 lpfc_printf_vlog(vport, KERN_ERR, LOG_DISCOVERY,
@@ -276,6 +275,124 @@ lpfc_dev_loss_tmo_handler(struct lpfc_nodelist *ndlp)
                 lpfc_disc_state_machine(vport, ndlp, NULL, NLP_EVT_DEVICE_RM);
 }
 
+/**
+ * lpfc_alloc_fast_evt: Allocates data structure for posting event.
+ * @phba: Pointer to hba context object.
+ *
+ * This function is called from the functions which need to post
+ * events from interrupt context. This function allocates data
+ * structure required for posting event. It also keeps track of
+ * number of events pending and prevent event storm when there are
+ * too many events.
+ **/
+struct lpfc_fast_path_event *
+lpfc_alloc_fast_evt(struct lpfc_hba *phba) {
+        struct lpfc_fast_path_event *ret;
+
+        /* If there are lot of fast event do not exhaust memory due to this */
+        if (atomic_read(&phba->fast_event_count) > LPFC_MAX_EVT_COUNT)
+                return NULL;
+
+        ret = kzalloc(sizeof(struct lpfc_fast_path_event),
+                        GFP_ATOMIC);
+        if (ret)
+                atomic_inc(&phba->fast_event_count);
+        INIT_LIST_HEAD(&ret->work_evt.evt_listp);
+        ret->work_evt.evt = LPFC_EVT_FASTPATH_MGMT_EVT;
+        return ret;
+}
+
+/**
+ * lpfc_free_fast_evt: Frees event data structure.
+ * @phba: Pointer to hba context object.
+ * @evt:  Event object which need to be freed.
+ *
+ * This function frees the data structure required for posting
+ * events.
+ **/
+void
+lpfc_free_fast_evt(struct lpfc_hba *phba,
+                struct lpfc_fast_path_event *evt) {
+
+        atomic_dec(&phba->fast_event_count);
+        kfree(evt);
+}
+
+/**
+ * lpfc_send_fastpath_evt: Posts events generated from fast path.
+ * @phba: Pointer to hba context object.
+ * @evtp: Event data structure.
+ *
+ * This function is called from worker thread, when the interrupt
+ * context need to post an event. This function posts the event
+ * to fc transport netlink interface.
+ **/
+static void
+lpfc_send_fastpath_evt(struct lpfc_hba *phba,
+                struct lpfc_work_evt *evtp)
+{
+        unsigned long evt_category, evt_sub_category;
+        struct lpfc_fast_path_event *fast_evt_data;
+        char *evt_data;
+        uint32_t evt_data_size;
+        struct Scsi_Host *shost;
+
+        fast_evt_data = container_of(evtp, struct lpfc_fast_path_event,
+                work_evt);
+
+        evt_category = (unsigned long) fast_evt_data->un.fabric_evt.event_type;
+        evt_sub_category = (unsigned long) fast_evt_data->un.
+                        fabric_evt.subcategory;
+        shost = lpfc_shost_from_vport(fast_evt_data->vport);
+        if (evt_category == FC_REG_FABRIC_EVENT) {
+                if (evt_sub_category == LPFC_EVENT_FCPRDCHKERR) {
+                        evt_data = (char *) &fast_evt_data->un.read_check_error;
+                        evt_data_size = sizeof(fast_evt_data->un.
+                                read_check_error);
+                } else if ((evt_sub_category == LPFC_EVENT_FABRIC_BUSY) ||
+                        (evt_sub_category == IOSTAT_NPORT_BSY)) {
+                        evt_data = (char *) &fast_evt_data->un.fabric_evt;
+                        evt_data_size = sizeof(fast_evt_data->un.fabric_evt);
+                } else {
+                        lpfc_free_fast_evt(phba, fast_evt_data);
+                        return;
+                }
+        } else if (evt_category == FC_REG_SCSI_EVENT) {
+                switch (evt_sub_category) {
+                case LPFC_EVENT_QFULL:
+                case LPFC_EVENT_DEVBSY:
+                        evt_data = (char *) &fast_evt_data->un.scsi_evt;
+                        evt_data_size = sizeof(fast_evt_data->un.scsi_evt);
+                        break;
+                case LPFC_EVENT_CHECK_COND:
+                        evt_data = (char *) &fast_evt_data->un.check_cond_evt;
+                        evt_data_size =  sizeof(fast_evt_data->un.
+                                check_cond_evt);
+                        break;
+                case LPFC_EVENT_VARQUEDEPTH:
+                        evt_data = (char *) &fast_evt_data->un.queue_depth_evt;
+                        evt_data_size = sizeof(fast_evt_data->un.
+                                queue_depth_evt);
+                        break;
+                default:
+                        lpfc_free_fast_evt(phba, fast_evt_data);
+                        return;
+                }
+        } else {
+                lpfc_free_fast_evt(phba, fast_evt_data);
+                return;
+        }
+
+        fc_host_post_vendor_event(shost,
+                fc_get_event_number(),
+                evt_data_size,
+                evt_data,
+                SCSI_NL_VID_TYPE_PCI | PCI_VENDOR_ID_EMULEX);
+
+        lpfc_free_fast_evt(phba, fast_evt_data);
+        return;
+}
+
 static void
 lpfc_work_list_done(struct lpfc_hba *phba)
 {
@@ -347,6 +464,10 @@ lpfc_work_list_done(struct lpfc_hba *phba)
                         lpfc_unblock_mgmt_io(phba);
                         complete((struct completion *)(evtp->evt_arg2));
                         break;
+                case LPFC_EVT_FASTPATH_MGMT_EVT:
+                        lpfc_send_fastpath_evt(phba, evtp);
+                        free_evt = 0;
+                        break;
                 }
                 if (free_evt)
                         kfree(evtp);
@@ -371,6 +492,7 @@ lpfc_work_done(struct lpfc_hba *phba)
         spin_unlock_irq(&phba->hbalock);
 
         if (ha_copy & HA_ERATT)
+                /* Handle the error attention event */
                 lpfc_handle_eratt(phba);
 
         if (ha_copy & HA_MBATT)
@@ -378,6 +500,7 @@ lpfc_work_done(struct lpfc_hba *phba)
 
         if (ha_copy & HA_LATT)
                 lpfc_handle_latt(phba);
+
         vports = lpfc_create_vport_work_array(phba);
         if (vports != NULL)
                 for(i = 0; i <= phba->max_vpi; i++) {
@@ -1013,14 +1136,10 @@ out:
 }
 
 static void
-lpfc_mbx_issue_link_down(struct lpfc_hba *phba)
+lpfc_enable_la(struct lpfc_hba *phba)
 {
         uint32_t control;
         struct lpfc_sli *psli = &phba->sli;
-
-        lpfc_linkdown(phba);
-
-        /* turn on Link Attention interrupts - no CLEAR_LA needed */
         spin_lock_irq(&phba->hbalock);
         psli->sli_flag |= LPFC_PROCESS_LA;
         control = readl(phba->HCregaddr);
@@ -1030,6 +1149,15 @@ lpfc_mbx_issue_link_down(struct lpfc_hba *phba)
         spin_unlock_irq(&phba->hbalock);
 }
 
+static void
+lpfc_mbx_issue_link_down(struct lpfc_hba *phba)
+{
+        lpfc_linkdown(phba);
+        lpfc_enable_la(phba);
+        /* turn on Link Attention interrupts - no CLEAR_LA needed */
+}
+
+
 /*
  * This routine handles processing a READ_LA mailbox
  * command upon completion. It is setup in the LPFC_MBOXQ
@@ -1077,8 +1205,12 @@ lpfc_mbx_cmpl_read_la(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
         }
 
         phba->fc_eventTag = la->eventTag;
+        if (la->mm)
+                phba->sli.sli_flag |= LPFC_MENLO_MAINT;
+        else
+                phba->sli.sli_flag &= ~LPFC_MENLO_MAINT;
 
-        if (la->attType == AT_LINK_UP) {
+        if (la->attType == AT_LINK_UP && (!la->mm)) {
                 phba->fc_stat.LinkUp++;
                 if (phba->link_flag & LS_LOOPBACK_MODE) {
                         lpfc_printf_log(phba, KERN_ERR, LOG_LINK_EVENT,
@@ -1090,13 +1222,15 @@ lpfc_mbx_cmpl_read_la(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
                 } else {
                         lpfc_printf_log(phba, KERN_ERR, LOG_LINK_EVENT,
                                         "1303 Link Up Event x%x received "
-                                        "Data: x%x x%x x%x x%x\n",
+                                        "Data: x%x x%x x%x x%x x%x x%x %d\n",
                                         la->eventTag, phba->fc_eventTag,
                                         la->granted_AL_PA, la->UlnkSpeed,
-                                        phba->alpa_map[0]);
+                                        phba->alpa_map[0],
+                                        la->mm, la->fa,
+                                        phba->wait_4_mlo_maint_flg);
                 }
                 lpfc_mbx_process_link_up(phba, la);
-        } else {
+        } else if (la->attType == AT_LINK_DOWN) {
                 phba->fc_stat.LinkDown++;
                 if (phba->link_flag & LS_LOOPBACK_MODE) {
                         lpfc_printf_log(phba, KERN_ERR, LOG_LINK_EVENT,
@@ -1109,11 +1243,46 @@ lpfc_mbx_cmpl_read_la(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
                 else {
                         lpfc_printf_log(phba, KERN_ERR, LOG_LINK_EVENT,
                                 "1305 Link Down Event x%x received "
+                                "Data: x%x x%x x%x x%x x%x\n",
+                                la->eventTag, phba->fc_eventTag,
+                                phba->pport->port_state, vport->fc_flag,
+                                la->mm, la->fa);
+                }
+                lpfc_mbx_issue_link_down(phba);
+        }
+        if (la->mm && la->attType == AT_LINK_UP) {
+                if (phba->link_state != LPFC_LINK_DOWN) {
+                        phba->fc_stat.LinkDown++;
+                        lpfc_printf_log(phba, KERN_ERR, LOG_LINK_EVENT,
+                                "1312 Link Down Event x%x received "
+                                "Data: x%x x%x x%x\n",
+                                la->eventTag, phba->fc_eventTag,
+                                phba->pport->port_state, vport->fc_flag);
+                        lpfc_mbx_issue_link_down(phba);
+                } else
+                        lpfc_enable_la(phba);
+
+                lpfc_printf_log(phba, KERN_ERR, LOG_LINK_EVENT,
+                                "1310 Menlo Maint Mode Link up Event x%x rcvd "
                                 "Data: x%x x%x x%x\n",
                                 la->eventTag, phba->fc_eventTag,
                                 phba->pport->port_state, vport->fc_flag);
+                /*
+                 * The cmnd that triggered this will be waiting for this
+                 * signal.
+                 */
+                /* WAKEUP for MENLO_SET_MODE or MENLO_RESET command. */
+                if (phba->wait_4_mlo_maint_flg) {
+                        phba->wait_4_mlo_maint_flg = 0;
+                        wake_up_interruptible(&phba->wait_4_mlo_m_q);
                 }
-                lpfc_mbx_issue_link_down(phba);
+        }
+
+        if (la->fa) {
+                if (la->mm)
+                        lpfc_issue_clear_la(phba, vport);
+                lpfc_printf_log(phba, KERN_INFO, LOG_LINK_EVENT,
+                                "1311 fa %d\n", la->fa);
         }
 
 lpfc_mbx_cmpl_read_la_free_mbuf:
@@ -1177,7 +1346,7 @@ lpfc_mbx_cmpl_unreg_vpi(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
                 scsi_host_put(shost);
 }
 
-void
+int
 lpfc_mbx_unreg_vpi(struct lpfc_vport *vport)
 {
         struct lpfc_hba  *phba = vport->phba;
@@ -1186,7 +1355,7 @@ lpfc_mbx_unreg_vpi(struct lpfc_vport *vport)
 
         mbox = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
         if (!mbox)
-                return;
+                return 1;
 
         lpfc_unreg_vpi(phba, vport->vpi, mbox);
         mbox->vport = vport;
@@ -1197,7 +1366,9 @@ lpfc_mbx_unreg_vpi(struct lpfc_vport *vport)
                                  "1800 Could not issue unreg_vpi\n");
                 mempool_free(mbox, phba->mbox_mem_pool);
                 vport->unreg_vpi_cmpl = VPORT_ERROR;
+                return rc;
         }
+        return 0;
 }
 
 static void
@@ -1553,6 +1724,22 @@ lpfc_nlp_state_cleanup(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                  */
                 lpfc_register_remote_port(vport, ndlp);
         }
+        if ((new_state ==  NLP_STE_MAPPED_NODE) &&
+                (vport->stat_data_enabled)) {
+                /*
+                 * A new target is discovered, if there is no buffer for
+                 * statistical data collection allocate buffer.
+                 */
+                ndlp->lat_data = kcalloc(LPFC_MAX_BUCKET_COUNT,
+                                         sizeof(struct lpfc_scsicmd_bkt),
+                                         GFP_KERNEL);
+
+                if (!ndlp->lat_data)
+                        lpfc_printf_vlog(vport, KERN_ERR, LOG_NODE,
+                                "0286 lpfc_nlp_state_cleanup failed to "
+                                "allocate statistical data buffer DID "
+                                "0x%x\n", ndlp->nlp_DID);
+        }
         /*
          * if we added to Mapped list, but the remote port
          * registration failed or assigned a target id outside
@@ -2786,7 +2973,7 @@ restart_disc:
 
         default:
                 lpfc_printf_vlog(vport, KERN_ERR, LOG_DISCOVERY,
-                                 "0229 Unexpected discovery timeout, "
+                                 "0273 Unexpected discovery timeout, "
                                  "vport State x%x\n", vport->port_state);
                 break;
         }
@@ -2940,6 +3127,8 @@ lpfc_nlp_init(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
         INIT_LIST_HEAD(&ndlp->nlp_listp);
         kref_init(&ndlp->kref);
         NLP_INT_NODE_ACT(ndlp);
+        atomic_set(&ndlp->cmd_pending, 0);
+        ndlp->cmd_qdepth = LPFC_MAX_TGT_QDEPTH;
 
         lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_NODE,
                 "node init:       did:x%x",
@@ -2979,8 +3168,10 @@ lpfc_nlp_release(struct kref *kref)
         spin_unlock_irqrestore(&phba->ndlp_lock, flags);
 
         /* free ndlp memory for final ndlp release */
-        if (NLP_CHK_FREE_REQ(ndlp))
+        if (NLP_CHK_FREE_REQ(ndlp)) {
+                kfree(ndlp->lat_data);
                 mempool_free(ndlp, ndlp->vport->phba->nlp_mem_pool);
+        }
 }
 
 /* This routine bumps the reference count for a ndlp structure to ensure
diff --git a/drivers/scsi/lpfc/lpfc_hw.h b/drivers/scsi/lpfc/lpfc_hw.h
index 7773b949aa7c..5de5dabbbee6 100644
--- a/drivers/scsi/lpfc/lpfc_hw.h
+++ b/drivers/scsi/lpfc/lpfc_hw.h
@@ -1107,6 +1107,8 @@ typedef struct {
 /* Start FireFly Register definitions */
 #define PCI_VENDOR_ID_EMULEX        0x10df
 #define PCI_DEVICE_ID_FIREFLY       0x1ae5
+#define PCI_DEVICE_ID_PROTEUS_VF    0xe100
+#define PCI_DEVICE_ID_PROTEUS_PF    0xe180
 #define PCI_DEVICE_ID_SAT_SMB       0xf011
 #define PCI_DEVICE_ID_SAT_MID       0xf015
 #define PCI_DEVICE_ID_RFLY          0xf095
@@ -1133,10 +1135,12 @@ typedef struct {
 #define PCI_DEVICE_ID_LP11000S      0xfc10
 #define PCI_DEVICE_ID_LPE11000S     0xfc20
 #define PCI_DEVICE_ID_SAT_S         0xfc40
+#define PCI_DEVICE_ID_PROTEUS_S     0xfc50
 #define PCI_DEVICE_ID_HELIOS        0xfd00
 #define PCI_DEVICE_ID_HELIOS_SCSP   0xfd11
 #define PCI_DEVICE_ID_HELIOS_DCSP   0xfd12
 #define PCI_DEVICE_ID_ZEPHYR        0xfe00
+#define PCI_DEVICE_ID_HORNET        0xfe05
 #define PCI_DEVICE_ID_ZEPHYR_SCSP   0xfe11
 #define PCI_DEVICE_ID_ZEPHYR_DCSP   0xfe12
 
@@ -1154,6 +1158,7 @@ typedef struct {
 #define ZEPHYR_JEDEC_ID             0x0577
 #define VIPER_JEDEC_ID              0x4838
 #define SATURN_JEDEC_ID             0x1004
+#define HORNET_JDEC_ID              0x2057706D
 
 #define JEDEC_ID_MASK               0x0FFFF000
 #define JEDEC_ID_SHIFT              12
@@ -1198,6 +1203,18 @@ typedef struct {		/* FireFly BIU registers */
 #define HA_RXATT       0x00000008       /* Bit  3 */
 #define HA_RXMASK      0x0000000f
 
+#define HA_R0_CLR_MSK   (HA_R0RE_REQ | HA_R0CE_RSP | HA_R0ATT)
+#define HA_R1_CLR_MSK   (HA_R1RE_REQ | HA_R1CE_RSP | HA_R1ATT)
+#define HA_R2_CLR_MSK   (HA_R2RE_REQ | HA_R2CE_RSP | HA_R2ATT)
+#define HA_R3_CLR_MSK   (HA_R3RE_REQ | HA_R3CE_RSP | HA_R3ATT)
+
+#define HA_R0_POS       3
+#define HA_R1_POS       7
+#define HA_R2_POS       11
+#define HA_R3_POS       15
+#define HA_LE_POS       29
+#define HA_MB_POS       30
+#define HA_ER_POS       31
 /* Chip Attention Register */
 
 #define CA_REG_OFFSET  4        /* Byte offset from register base address */
@@ -1235,7 +1252,7 @@ typedef struct {		/* FireFly BIU registers */
 
 /* Host Control Register */
 
-#define HC_REG_OFFSET  12       /* Word offset from register base address */
+#define HC_REG_OFFSET  12       /* Byte offset from register base address */
 
 #define HC_MBINT_ENA   0x00000001       /* Bit  0 */
 #define HC_R0INT_ENA   0x00000002       /* Bit  1 */
@@ -1248,6 +1265,19 @@ typedef struct {		/* FireFly BIU registers */
 #define HC_LAINT_ENA   0x20000000       /* Bit 29 */
 #define HC_ERINT_ENA   0x80000000       /* Bit 31 */
 
+/* Message Signaled Interrupt eXtension (MSI-X) message identifiers */
+#define MSIX_DFLT_ID    0
+#define MSIX_RNG0_ID    0
+#define MSIX_RNG1_ID    1
+#define MSIX_RNG2_ID    2
+#define MSIX_RNG3_ID    3
+
+#define MSIX_LINK_ID    4
+#define MSIX_MBOX_ID    5
+
+#define MSIX_SPARE0_ID  6
+#define MSIX_SPARE1_ID  7
+
 /* Mailbox Commands */
 #define MBX_SHUTDOWN        0x00        /* terminate testing */
 #define MBX_LOAD_SM         0x01
@@ -1285,10 +1315,14 @@ typedef struct {		/* FireFly BIU registers */
 #define MBX_KILL_BOARD      0x24
 #define MBX_CONFIG_FARP     0x25
 #define MBX_BEACON          0x2A
+#define MBX_CONFIG_MSI      0x30
 #define MBX_HEARTBEAT       0x31
 #define MBX_WRITE_VPARMS    0x32
 #define MBX_ASYNCEVT_ENABLE 0x33
 
+#define MBX_PORT_CAPABILITIES 0x3B
+#define MBX_PORT_IOV_CONTROL 0x3C
+
 #define MBX_CONFIG_HBQ      0x7C
 #define MBX_LOAD_AREA       0x81
 #define MBX_RUN_BIU_DIAG64  0x84
@@ -1474,24 +1508,18 @@ struct ulp_bde64 {	/* SLI-2 */
                         uint32_t bdeFlags:8;    /* BDE Flags 0 IS A SUPPORTED
                                                    VALUE !! */
 #endif
-
-#define BUFF_USE_RSVD       0x01        /* bdeFlags */
-#define BUFF_USE_INTRPT     0x02        /* Not Implemented with LP6000 */
-#define BUFF_USE_CMND       0x04        /* Optional, 1=cmd/rsp 0=data buffer */
-#define BUFF_USE_RCV        0x08        /*  "" "", 1=rcv buffer, 0=xmit
-                                            buffer */
-#define BUFF_TYPE_32BIT     0x10        /*  "" "", 1=32 bit addr 0=64 bit
-                                            addr */
-#define BUFF_TYPE_SPECIAL   0x20        /* Not Implemented with LP6000  */
-#define BUFF_TYPE_BDL       0x40        /* Optional,  may be set in BDL */
-#define BUFF_TYPE_INVALID   0x80        /*  ""  "" */
+#define BUFF_TYPE_BDE_64    0x00        /* BDE (Host_resident) */
+#define BUFF_TYPE_BDE_IMMED 0x01        /* Immediate Data BDE */
+#define BUFF_TYPE_BDE_64P   0x02        /* BDE (Port-resident) */
+#define BUFF_TYPE_BDE_64I   0x08        /* Input BDE (Host-resident) */
+#define BUFF_TYPE_BDE_64IP  0x0A        /* Input BDE (Port-resident) */
+#define BUFF_TYPE_BLP_64    0x40        /* BLP (Host-resident) */
+#define BUFF_TYPE_BLP_64P   0x42        /* BLP (Port-resident) */
                 } f;
         } tus;
         uint32_t addrLow;
         uint32_t addrHigh;
 };
-#define BDE64_SIZE_WORD 0
-#define BPL64_SIZE_WORD 0x40
 
 typedef struct ULP_BDL {        /* SLI-2 */
 #ifdef __BIG_ENDIAN_BITFIELD
@@ -2201,7 +2229,10 @@ typedef struct {
 typedef struct {
         uint32_t eventTag;      /* Event tag */
 #ifdef __BIG_ENDIAN_BITFIELD
-        uint32_t rsvd1:22;
+        uint32_t rsvd1:19;
+        uint32_t fa:1;
+        uint32_t mm:1;          /* Menlo Maintenance mode enabled */
+        uint32_t rx:1;
         uint32_t pb:1;
         uint32_t il:1;
         uint32_t attType:8;
@@ -2209,7 +2240,10 @@ typedef struct {
         uint32_t attType:8;
         uint32_t il:1;
         uint32_t pb:1;
-        uint32_t rsvd1:22;
+        uint32_t rx:1;
+        uint32_t mm:1;
+        uint32_t fa:1;
+        uint32_t rsvd1:19;
 #endif
 
 #define AT_RESERVED    0x00     /* Reserved - attType */
@@ -2230,6 +2264,7 @@ typedef struct {
 
 #define TOPOLOGY_PT_PT 0x01     /* Topology is pt-pt / pt-fabric */
 #define TOPOLOGY_LOOP  0x02     /* Topology is FC-AL */
+#define TOPOLOGY_LNK_MENLO_MAINTENANCE 0x05 /* maint mode zephtr to menlo */
 
         union {
                 struct ulp_bde lilpBde; /* This BDE points to a 128 byte buffer
@@ -2324,6 +2359,36 @@ typedef struct {
 #define  DMP_RSP_OFFSET          0x14   /* word 5 contains first word of rsp */
 #define  DMP_RSP_SIZE            0x6C   /* maximum of 27 words of rsp data */
 
+/* Structure for MB Command UPDATE_CFG (0x1B) */
+
+struct update_cfg_var {
+#ifdef __BIG_ENDIAN_BITFIELD
+        uint32_t rsvd2:16;
+        uint32_t type:8;
+        uint32_t rsvd:1;
+        uint32_t ra:1;
+        uint32_t co:1;
+        uint32_t cv:1;
+        uint32_t req:4;
+        uint32_t entry_length:16;
+        uint32_t region_id:16;
+#else  /*  __LITTLE_ENDIAN_BITFIELD */
+        uint32_t req:4;
+        uint32_t cv:1;
+        uint32_t co:1;
+        uint32_t ra:1;
+        uint32_t rsvd:1;
+        uint32_t type:8;
+        uint32_t rsvd2:16;
+        uint32_t region_id:16;
+        uint32_t entry_length:16;
+#endif
+
+        uint32_t resp_info;
+        uint32_t byte_cnt;
+        uint32_t data_offset;
+};
+
 struct hbq_mask {
 #ifdef __BIG_ENDIAN_BITFIELD
         uint8_t tmatch;
@@ -2560,6 +2625,40 @@ typedef struct {
 
 } CONFIG_PORT_VAR;
 
+/* Structure for MB Command CONFIG_MSI (0x30) */
+struct config_msi_var {
+#ifdef __BIG_ENDIAN_BITFIELD
+        uint32_t dfltMsgNum:8;  /* Default message number            */
+        uint32_t rsvd1:11;      /* Reserved                          */
+        uint32_t NID:5;         /* Number of secondary attention IDs */
+        uint32_t rsvd2:5;       /* Reserved                          */
+        uint32_t dfltPresent:1; /* Default message number present    */
+        uint32_t addFlag:1;     /* Add association flag              */
+        uint32_t reportFlag:1;  /* Report association flag           */
+#else   /*  __LITTLE_ENDIAN_BITFIELD */
+        uint32_t reportFlag:1;  /* Report association flag           */
+        uint32_t addFlag:1;     /* Add association flag              */
+        uint32_t dfltPresent:1; /* Default message number present    */
+        uint32_t rsvd2:5;       /* Reserved                          */
+        uint32_t NID:5;         /* Number of secondary attention IDs */
+        uint32_t rsvd1:11;      /* Reserved                          */
+        uint32_t dfltMsgNum:8;  /* Default message number            */
+#endif
+        uint32_t attentionConditions[2];
+        uint8_t  attentionId[16];
+        uint8_t  messageNumberByHA[64];
+        uint8_t  messageNumberByID[16];
+        uint32_t autoClearHA[2];
+#ifdef __BIG_ENDIAN_BITFIELD
+        uint32_t rsvd3:16;
+        uint32_t autoClearID:16;
+#else   /*  __LITTLE_ENDIAN_BITFIELD */
+        uint32_t autoClearID:16;
+        uint32_t rsvd3:16;
+#endif
+        uint32_t rsvd4;
+};
+
 /* SLI-2 Port Control Block */
 
 /* SLIM POINTER */
@@ -2678,10 +2777,12 @@ typedef union {
                                          * NEW_FEATURE
                                          */
         struct config_hbq_var varCfgHbq;/* cmd = 0x7c (CONFIG_HBQ)  */
+        struct update_cfg_var varUpdateCfg; /* cmd = 0x1B (UPDATE_CFG)*/
         CONFIG_PORT_VAR varCfgPort;     /* cmd = 0x88 (CONFIG_PORT)  */
         REG_VPI_VAR varRegVpi;          /* cmd = 0x96 (REG_VPI) */
         UNREG_VPI_VAR varUnregVpi;      /* cmd = 0x97 (UNREG_VPI) */
         ASYNCEVT_ENABLE_VAR varCfgAsyncEvent; /*cmd = x33 (CONFIG_ASYNC) */
+        struct config_msi_var varCfgMSI;/* cmd = x30 (CONFIG_MSI)     */
 } MAILVARIANTS;
 
 /*
@@ -2715,11 +2816,19 @@ struct sli3_pgp {
         uint32_t hbq_get[16];
 };
 
-typedef union {
-        struct sli2_desc s2;
-        struct sli3_desc s3;
-        struct sli3_pgp  s3_pgp;
-} SLI_VAR;
+struct sli3_inb_pgp {
+        uint32_t ha_copy;
+        uint32_t counter;
+        struct lpfc_pgp port[MAX_RINGS];
+        uint32_t hbq_get[16];
+};
+
+union sli_var {
+        struct sli2_desc        s2;
+        struct sli3_desc        s3;
+        struct sli3_pgp         s3_pgp;
+        struct sli3_inb_pgp     s3_inb_pgp;
+};
 
 typedef struct {
 #ifdef __BIG_ENDIAN_BITFIELD
@@ -2737,7 +2846,7 @@ typedef struct {
 #endif
 
         MAILVARIANTS un;
-        SLI_VAR us;
+        union sli_var us;
 } MAILBOX_t;
 
 /*
@@ -3105,6 +3214,27 @@ struct que_xri64cx_ext_fields {
         struct lpfc_hbq_entry   buff[5];
 };
 
+#define LPFC_EXT_DATA_BDE_COUNT 3
+struct fcp_irw_ext {
+        uint32_t        io_tag64_low;
+        uint32_t        io_tag64_high;
+#ifdef __BIG_ENDIAN_BITFIELD
+        uint8_t         reserved1;
+        uint8_t         reserved2;
+        uint8_t         reserved3;
+        uint8_t         ebde_count;
+#else  /* __LITTLE_ENDIAN */
+        uint8_t         ebde_count;
+        uint8_t         reserved3;
+        uint8_t         reserved2;
+        uint8_t         reserved1;
+#endif
+        uint32_t        reserved4;
+        struct ulp_bde64 rbde;          /* response bde */
+        struct ulp_bde64 dbde[LPFC_EXT_DATA_BDE_COUNT]; /* data BDE or BPL */
+        uint8_t icd[32];                /* immediate command data (32 bytes) */
+};
+
 typedef struct _IOCB {  /* IOCB structure */
         union {
                 GENERIC_RSP grsp;       /* Generic response */
@@ -3190,7 +3320,7 @@ typedef struct _IOCB {	/* IOCB structure */
 
                 /* words 8-31 used for que_xri_cx iocb */
                 struct que_xri64cx_ext_fields que_xri64cx_ext_words;
-
+                struct fcp_irw_ext fcp_ext;
                 uint32_t sli3Words[24]; /* 96 extra bytes for SLI-3 */
         } unsli3;
 
@@ -3292,3 +3422,10 @@ lpfc_error_lost_link(IOCB_t *iocbp)
                  iocbp->un.ulpWord[4] == IOERR_LINK_DOWN ||
                  iocbp->un.ulpWord[4] == IOERR_SLI_DOWN));
 }
+
+#define MENLO_TRANSPORT_TYPE 0xfe
+#define MENLO_CONTEXT 0
+#define MENLO_PU 3
+#define MENLO_TIMEOUT 30
+#define SETVAR_MLOMNT 0x103107
+#define SETVAR_MLORST 0x103007
diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
index d51a2a4b43eb..909be3301bba 100644
--- a/drivers/scsi/lpfc/lpfc_init.c
+++ b/drivers/scsi/lpfc/lpfc_init.c
@@ -36,6 +36,7 @@
 
 #include "lpfc_hw.h"
 #include "lpfc_sli.h"
+#include "lpfc_nl.h"
 #include "lpfc_disc.h"
 #include "lpfc_scsi.h"
 #include "lpfc.h"
@@ -52,17 +53,20 @@ static struct scsi_transport_template *lpfc_transport_template = NULL;
 static struct scsi_transport_template *lpfc_vport_transport_template = NULL;
 static DEFINE_IDR(lpfc_hba_index);
 
-/************************************************************************/
-/*                                                                      */
-/*    lpfc_config_port_prep                                             */
-/*    This routine will do LPFC initialization prior to the             */
-/*    CONFIG_PORT mailbox command. This will be initialized             */
-/*    as a SLI layer callback routine.                                  */
-/*    This routine returns 0 on success or -ERESTART if it wants        */
-/*    the SLI layer to reset the HBA and try again. Any                 */
-/*    other return value indicates an error.                            */
-/*                                                                      */
-/************************************************************************/
+/**
+ * lpfc_config_port_prep: Perform lpfc initialization prior to config port.
+ * @phba: pointer to lpfc hba data structure.
+ *
+ * This routine will do LPFC initialization prior to issuing the CONFIG_PORT
+ * mailbox command. It retrieves the revision information from the HBA and
+ * collects the Vital Product Data (VPD) about the HBA for preparing the
+ * configuration of the HBA.
+ *
+ * Return codes:
+ *   0 - success.
+ *   -ERESTART - requests the SLI layer to reset the HBA and try again.
+ *   Any other value - indicates an error.
+ **/
 int
 lpfc_config_port_prep(struct lpfc_hba *phba)
 {
@@ -180,12 +184,9 @@ lpfc_config_port_prep(struct lpfc_hba *phba)
                                                 sizeof (phba->RandomData));
 
         /* Get adapter VPD information */
-        pmb->context2 = kmalloc(DMP_RSP_SIZE, GFP_KERNEL);
-        if (!pmb->context2)
-                goto out_free_mbox;
         lpfc_vpd_data = kmalloc(DMP_VPD_SIZE, GFP_KERNEL);
         if (!lpfc_vpd_data)
-                goto out_free_context2;
+                goto out_free_mbox;
 
         do {
                 lpfc_dump_mem(phba, pmb, offset);
@@ -200,21 +201,29 @@ lpfc_config_port_prep(struct lpfc_hba *phba)
                 }
                 if (mb->un.varDmp.word_cnt > DMP_VPD_SIZE - offset)
                         mb->un.varDmp.word_cnt = DMP_VPD_SIZE - offset;
-                lpfc_sli_pcimem_bcopy(pmb->context2, lpfc_vpd_data + offset,
+                lpfc_sli_pcimem_bcopy(((uint8_t *)mb) + DMP_RSP_OFFSET,
+                                      lpfc_vpd_data + offset,
                                       mb->un.varDmp.word_cnt);
                 offset += mb->un.varDmp.word_cnt;
         } while (mb->un.varDmp.word_cnt && offset < DMP_VPD_SIZE);
         lpfc_parse_vpd(phba, lpfc_vpd_data, offset);
 
         kfree(lpfc_vpd_data);
-out_free_context2:
-        kfree(pmb->context2);
 out_free_mbox:
         mempool_free(pmb, phba->mbox_mem_pool);
         return 0;
 }
 
-/* Completion handler for config async event mailbox command. */
+/**
+ * lpfc_config_async_cmpl: Completion handler for config async event mbox cmd.
+ * @phba: pointer to lpfc hba data structure.
+ * @pmboxq: pointer to the driver internal queue element for mailbox command.
+ *
+ * This is the completion handler for driver's configuring asynchronous event
+ * mailbox command to the device. If the mailbox command returns successfully,
+ * it will set internal async event support flag to 1; otherwise, it will
+ * set internal async event support flag to 0.
+ **/
 static void
 lpfc_config_async_cmpl(struct lpfc_hba * phba, LPFC_MBOXQ_t * pmboxq)
 {
@@ -226,16 +235,19 @@ lpfc_config_async_cmpl(struct lpfc_hba * phba, LPFC_MBOXQ_t * pmboxq)
         return;
 }
 
-/************************************************************************/
-/*                                                                      */
-/*    lpfc_config_port_post                                             */
-/*    This routine will do LPFC initialization after the                */
-/*    CONFIG_PORT mailbox command. This will be initialized             */
-/*    as a SLI layer callback routine.                                  */
-/*    This routine returns 0 on success. Any other return value         */
-/*    indicates an error.                                               */
-/*                                                                      */
-/************************************************************************/
+/**
+ * lpfc_config_port_post: Perform lpfc initialization after config port.
+ * @phba: pointer to lpfc hba data structure.
+ *
+ * This routine will do LPFC initialization after the CONFIG_PORT mailbox
+ * command call. It performs all internal resource and state setups on the
+ * port: post IOCB buffers, enable appropriate host interrupt attentions,
+ * ELS ring timers, etc.
+ *
+ * Return codes
+ *   0 - success.
+ *   Any other value - error.
+ **/
 int
 lpfc_config_port_post(struct lpfc_hba *phba)
 {
@@ -378,6 +390,29 @@ lpfc_config_port_post(struct lpfc_hba *phba)
         if (phba->sli_rev != 3)
                 lpfc_post_rcv_buf(phba);
 
+        /*
+         * Configure HBA MSI-X attention conditions to messages if MSI-X mode
+         */
+        if (phba->intr_type == MSIX) {
+                rc = lpfc_config_msi(phba, pmb);
+                if (rc) {
+                        mempool_free(pmb, phba->mbox_mem_pool);
+                        return -EIO;
+                }
+                rc = lpfc_sli_issue_mbox(phba, pmb, MBX_POLL);
+                if (rc != MBX_SUCCESS) {
+                        lpfc_printf_log(phba, KERN_ERR, LOG_MBOX,
+                                        "0352 Config MSI mailbox command "
+                                        "failed, mbxCmd x%x, mbxStatus x%x\n",
+                                        pmb->mb.mbxCommand, pmb->mb.mbxStatus);
+                        mempool_free(pmb, phba->mbox_mem_pool);
+                        return -EIO;
+                }
+        }
+
+        /* Initialize ERATT handling flag */
+        phba->hba_flag &= ~HBA_ERATT_HANDLED;
+
         /* Enable appropriate host interrupts */
         spin_lock_irq(&phba->hbalock);
         status = readl(phba->HCregaddr);
@@ -393,26 +428,26 @@ lpfc_config_port_post(struct lpfc_hba *phba)
 
         if ((phba->cfg_poll & ENABLE_FCP_RING_POLLING) &&
             (phba->cfg_poll & DISABLE_FCP_RING_INT))
-                status &= ~(HC_R0INT_ENA << LPFC_FCP_RING);
+                status &= ~(HC_R0INT_ENA);
 
         writel(status, phba->HCregaddr);
         readl(phba->HCregaddr); /* flush */
         spin_unlock_irq(&phba->hbalock);
 
-        /*
-         * Setup the ring 0 (els)  timeout handler
-         */
-        timeout = phba->fc_ratov << 1;
+        /* Set up ring-0 (ELS) timer */
+        timeout = phba->fc_ratov * 2;
         mod_timer(&vport->els_tmofunc, jiffies + HZ * timeout);
+        /* Set up heart beat (HB) timer */
         mod_timer(&phba->hb_tmofunc, jiffies + HZ * LPFC_HB_MBOX_INTERVAL);
         phba->hb_outstanding = 0;
         phba->last_completion_time = jiffies;
+        /* Set up error attention (ERATT) polling timer */
+        mod_timer(&phba->eratt_poll, jiffies + HZ * LPFC_ERATT_POLL_INTERVAL);
 
         lpfc_init_link(phba, pmb, phba->cfg_topology, phba->cfg_link_speed);
         pmb->mbox_cmpl = lpfc_sli_def_mbox_cmpl;
-        pmb->vport = vport;
-        rc = lpfc_sli_issue_mbox(phba, pmb, MBX_NOWAIT);
         lpfc_set_loopback_flag(phba);
+        rc = lpfc_sli_issue_mbox(phba, pmb, MBX_NOWAIT);
         if (rc != MBX_SUCCESS) {
                 lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
                                 "0454 Adapter failed to init, mbxCmd x%x "
@@ -447,19 +482,20 @@ lpfc_config_port_post(struct lpfc_hba *phba)
                                 rc);
                 mempool_free(pmb, phba->mbox_mem_pool);
         }
-        return (0);
+        return 0;
 }
 
-/************************************************************************/
-/*                                                                      */
-/*    lpfc_hba_down_prep                                                */
-/*    This routine will do LPFC uninitialization before the             */
-/*    HBA is reset when bringing down the SLI Layer. This will be       */
-/*    initialized as a SLI layer callback routine.                      */
-/*    This routine returns 0 on success. Any other return value         */
-/*    indicates an error.                                               */
-/*                                                                      */
-/************************************************************************/
+/**
+ * lpfc_hba_down_prep: Perform lpfc uninitialization prior to HBA reset.
+ * @phba: pointer to lpfc HBA data structure.
+ *
+ * This routine will do LPFC uninitialization before the HBA is reset when
+ * bringing down the SLI Layer.
+ *
+ * Return codes
+ *   0 - success.
+ *   Any other value - error.
+ **/
 int
 lpfc_hba_down_prep(struct lpfc_hba *phba)
 {
@@ -481,15 +517,17 @@ lpfc_hba_down_prep(struct lpfc_hba *phba)
         return 0;
 }
 
-/************************************************************************/
-/*                                                                      */
-/*    lpfc_hba_down_post                                                */
-/*    This routine will do uninitialization after the HBA is reset      */
-/*    when bringing down the SLI Layer.                                 */
-/*    This routine returns 0 on success. Any other return value         */
-/*    indicates an error.                                               */
-/*                                                                      */
-/************************************************************************/
+/**
+ * lpfc_hba_down_post: Perform lpfc uninitialization after HBA reset.
+ * @phba: pointer to lpfc HBA data structure.
+ *
+ * This routine will do uninitialization after the HBA is reset when bring
+ * down the SLI Layer.
+ *
+ * Return codes
+ *   0 - sucess.
+ *   Any other value - error.
+ **/
 int
 lpfc_hba_down_post(struct lpfc_hba *phba)
 {
@@ -548,7 +586,18 @@ lpfc_hba_down_post(struct lpfc_hba *phba)
         return 0;
 }
 
-/* HBA heart beat timeout handler */
+/**
+ * lpfc_hb_timeout: The HBA-timer timeout handler.
+ * @ptr: unsigned long holds the pointer to lpfc hba data structure.
+ *
+ * This is the HBA-timer timeout handler registered to the lpfc driver. When
+ * this timer fires, a HBA timeout event shall be posted to the lpfc driver
+ * work-port-events bitmap and the worker thread is notified. This timeout
+ * event will be used by the worker thread to invoke the actual timeout
+ * handler routine, lpfc_hb_timeout_handler. Any periodical operations will
+ * be performed in the timeout handler and the HBA timeout event bit shall
+ * be cleared by the worker thread after it has taken the event bitmap out.
+ **/
 static void
 lpfc_hb_timeout(unsigned long ptr)
 {
@@ -557,17 +606,36 @@ lpfc_hb_timeout(unsigned long ptr)
         unsigned long iflag;
 
         phba = (struct lpfc_hba *)ptr;
+
+        /* Check for heart beat timeout conditions */
         spin_lock_irqsave(&phba->pport->work_port_lock, iflag);
         tmo_posted = phba->pport->work_port_events & WORKER_HB_TMO;
         if (!tmo_posted)
                 phba->pport->work_port_events |= WORKER_HB_TMO;
         spin_unlock_irqrestore(&phba->pport->work_port_lock, iflag);
 
+        /* Tell the worker thread there is work to do */
         if (!tmo_posted)
                 lpfc_worker_wake_up(phba);
         return;
 }
 
+/**
+ * lpfc_hb_mbox_cmpl: The lpfc heart-beat mailbox command callback function.
+ * @phba: pointer to lpfc hba data structure.
+ * @pmboxq: pointer to the driver internal queue element for mailbox command.
+ *
+ * This is the callback function to the lpfc heart-beat mailbox command.
+ * If configured, the lpfc driver issues the heart-beat mailbox command to
+ * the HBA every LPFC_HB_MBOX_INTERVAL (current 5) seconds. At the time the
+ * heart-beat mailbox command is issued, the driver shall set up heart-beat
+ * timeout timer to LPFC_HB_MBOX_TIMEOUT (current 30) seconds and marks
+ * heart-beat outstanding state. Once the mailbox command comes back and
+ * no error conditions detected, the heart-beat mailbox command timer is
+ * reset to LPFC_HB_MBOX_INTERVAL seconds and the heart-beat outstanding
+ * state is cleared for the next heart-beat. If the timer expired with the
+ * heart-beat outstanding state set, the driver will put the HBA offline.
+ **/
 static void
 lpfc_hb_mbox_cmpl(struct lpfc_hba * phba, LPFC_MBOXQ_t * pmboxq)
 {
@@ -577,6 +645,7 @@ lpfc_hb_mbox_cmpl(struct lpfc_hba * phba, LPFC_MBOXQ_t * pmboxq)
         phba->hb_outstanding = 0;
         spin_unlock_irqrestore(&phba->hbalock, drvr_flag);
 
+        /* Check and reset heart-beat timer is necessary */
         mempool_free(pmboxq, phba->mbox_mem_pool);
         if (!(phba->pport->fc_flag & FC_OFFLINE_MODE) &&
                 !(phba->link_state == LPFC_HBA_ERROR) &&
@@ -586,6 +655,22 @@ lpfc_hb_mbox_cmpl(struct lpfc_hba * phba, LPFC_MBOXQ_t * pmboxq)
         return;
 }
 
+/**
+ * lpfc_hb_timeout_handler: The HBA-timer timeout handler.
+ * @phba: pointer to lpfc hba data structure.
+ *
+ * This is the actual HBA-timer timeout handler to be invoked by the worker
+ * thread whenever the HBA timer fired and HBA-timeout event posted. This
+ * handler performs any periodic operations needed for the device. If such
+ * periodic event has already been attended to either in the interrupt handler
+ * or by processing slow-ring or fast-ring events within the HBA-timer
+ * timeout window (LPFC_HB_MBOX_INTERVAL), this handler just simply resets
+ * the timer for the next timeout period. If lpfc heart-beat mailbox command
+ * is configured and there is no heart-beat mailbox command outstanding, a
+ * heart-beat mailbox is issued and timer set properly. Otherwise, if there
+ * has been a heart-beat mailbox command outstanding, the HBA shall be put
+ * to offline.
+ **/
 void
 lpfc_hb_timeout_handler(struct lpfc_hba *phba)
 {
@@ -684,6 +769,13 @@ lpfc_hb_timeout_handler(struct lpfc_hba *phba)
         }
 }
 
+/**
+ * lpfc_offline_eratt: Bring lpfc offline on hardware error attention.
+ * @phba: pointer to lpfc hba data structure.
+ *
+ * This routine is called to bring the HBA offline when HBA hardware error
+ * other than Port Error 6 has been detected.
+ **/
 static void
 lpfc_offline_eratt(struct lpfc_hba *phba)
 {
@@ -704,14 +796,16 @@ lpfc_offline_eratt(struct lpfc_hba *phba)
         return;
 }
 
-/************************************************************************/
-/*                                                                      */
-/*    lpfc_handle_eratt                                                 */
-/*    This routine will handle processing a Host Attention              */
-/*    Error Status event. This will be initialized                      */
-/*    as a SLI layer callback routine.                                  */
-/*                                                                      */
-/************************************************************************/
+/**
+ * lpfc_handle_eratt: The HBA hardware error handler.
+ * @phba: pointer to lpfc hba data structure.
+ *
+ * This routine is invoked to handle the following HBA hardware error
+ * conditions:
+ * 1 - HBA error attention interrupt
+ * 2 - DMA ring index out of range
+ * 3 - Mailbox command came back as unknown
+ **/
 void
 lpfc_handle_eratt(struct lpfc_hba *phba)
 {
@@ -722,6 +816,7 @@ lpfc_handle_eratt(struct lpfc_hba *phba)
         unsigned long temperature;
         struct temp_event temp_event_data;
         struct Scsi_Host  *shost;
+        struct lpfc_board_event_header board_event;
 
         /* If the pci channel is offline, ignore possible errors,
          * since we cannot communicate with the pci card anyway. */
@@ -731,6 +826,16 @@ lpfc_handle_eratt(struct lpfc_hba *phba)
         if (!phba->cfg_enable_hba_reset)
                 return;
 
+        /* Send an internal error event to mgmt application */
+        board_event.event_type = FC_REG_BOARD_EVENT;
+        board_event.subcategory = LPFC_EVENT_PORTINTERR;
+        shost = lpfc_shost_from_vport(phba->pport);
+        fc_host_post_vendor_event(shost, fc_get_event_number(),
+                                  sizeof(board_event),
+                                  (char *) &board_event,
+                                  SCSI_NL_VID_TYPE_PCI
+                                  | PCI_VENDOR_ID_EMULEX);
+
         if (phba->work_hs & HS_FFER6) {
                 /* Re-establishing Link */
                 lpfc_printf_log(phba, KERN_INFO, LOG_LINK_EVENT,
@@ -771,7 +876,7 @@ lpfc_handle_eratt(struct lpfc_hba *phba)
                 temp_event_data.data = (uint32_t)temperature;
 
                 lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
-                                "0459 Adapter maximum temperature exceeded "
+                                "0406 Adapter maximum temperature exceeded "
                                 "(%ld), taking this port offline "
                                 "Data: x%x x%x x%x\n",
                                 temperature, phba->work_hs,
@@ -791,8 +896,8 @@ lpfc_handle_eratt(struct lpfc_hba *phba)
 
         } else {
                 /* The if clause above forces this code path when the status
-                 * failure is a value other than FFER6.  Do not call the offline
-                 *  twice. This is the adapter hardware error path.
+                 * failure is a value other than FFER6. Do not call the offline
+                 * twice. This is the adapter hardware error path.
                  */
                 lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
                                 "0457 Adapter Hardware Error "
@@ -808,16 +913,16 @@ lpfc_handle_eratt(struct lpfc_hba *phba)
 
                 lpfc_offline_eratt(phba);
         }
+        return;
 }
 
-/************************************************************************/
-/*                                                                      */
-/*    lpfc_handle_latt                                                  */
-/*    This routine will handle processing a Host Attention              */
-/*    Link Status event. This will be initialized                       */
-/*    as a SLI layer callback routine.                                  */
-/*                                                                      */
-/************************************************************************/
+/**
+ * lpfc_handle_latt: The HBA link event handler.
+ * @phba: pointer to lpfc hba data structure.
+ *
+ * This routine is invoked from the worker thread to handle a HBA host
+ * attention link event.
+ **/
 void
 lpfc_handle_latt(struct lpfc_hba *phba)
 {
@@ -898,12 +1003,20 @@ lpfc_handle_latt_err_exit:
         return;
 }
 
-/************************************************************************/
-/*                                                                      */
-/*   lpfc_parse_vpd                                                     */
-/*   This routine will parse the VPD data                               */
-/*                                                                      */
-/************************************************************************/
+/**
+ * lpfc_parse_vpd: Parse VPD (Vital Product Data).
+ * @phba: pointer to lpfc hba data structure.
+ * @vpd: pointer to the vital product data.
+ * @len: length of the vital product data in bytes.
+ *
+ * This routine parses the Vital Product Data (VPD). The VPD is treated as
+ * an array of characters. In this routine, the ModelName, ProgramType, and
+ * ModelDesc, etc. fields of the phba data structure will be populated.
+ *
+ * Return codes
+ *   0 - pointer to the VPD passed in is NULL
+ *   1 - success
+ **/
 static int
 lpfc_parse_vpd(struct lpfc_hba *phba, uint8_t *vpd, int len)
 {
@@ -1040,12 +1153,25 @@ lpfc_parse_vpd(struct lpfc_hba *phba, uint8_t *vpd, int len)
         return(1);
 }
 
+/**
+ * lpfc_get_hba_model_desc: Retrieve HBA device model name and description.
+ * @phba: pointer to lpfc hba data structure.
+ * @mdp: pointer to the data structure to hold the derived model name.
+ * @descp: pointer to the data structure to hold the derived description.
+ *
+ * This routine retrieves HBA's description based on its registered PCI device
+ * ID. The @descp passed into this function points to an array of 256 chars. It
+ * shall be returned with the model name, maximum speed, and the host bus type.
+ * The @mdp passed into this function points to an array of 80 chars. When the
+ * function returns, the @mdp will be filled with the model name.
+ **/
 static void
 lpfc_get_hba_model_desc(struct lpfc_hba *phba, uint8_t *mdp, uint8_t *descp)
 {
         lpfc_vpd_t *vp;
         uint16_t dev_id = phba->pcidev->device;
         int max_speed;
+        int GE = 0;
         struct {
                 char * name;
                 int    max_speed;
@@ -1177,6 +1303,19 @@ lpfc_get_hba_model_desc(struct lpfc_hba *phba, uint8_t *mdp, uint8_t *descp)
         case PCI_DEVICE_ID_SAT_S:
                 m = (typeof(m)){"LPe12000-S", max_speed, "PCIe"};
                 break;
+        case PCI_DEVICE_ID_HORNET:
+                m = (typeof(m)){"LP21000", max_speed, "PCIe"};
+                GE = 1;
+                break;
+        case PCI_DEVICE_ID_PROTEUS_VF:
+                m = (typeof(m)) {"LPev12000", max_speed, "PCIe IOV"};
+                break;
+        case PCI_DEVICE_ID_PROTEUS_PF:
+                m = (typeof(m)) {"LPev12000", max_speed, "PCIe IOV"};
+                break;
+        case PCI_DEVICE_ID_PROTEUS_S:
+                m = (typeof(m)) {"LPemv12002-S", max_speed, "PCIe IOV"};
+                break;
         default:
                 m = (typeof(m)){ NULL };
                 break;
@@ -1186,18 +1325,25 @@ lpfc_get_hba_model_desc(struct lpfc_hba *phba, uint8_t *mdp, uint8_t *descp)
                 snprintf(mdp, 79,"%s", m.name);
         if (descp && descp[0] == '\0')
                 snprintf(descp, 255,
-                         "Emulex %s %dGb %s Fibre Channel Adapter",
-                         m.name, m.max_speed, m.bus);
+                        "Emulex %s %d%s %s %s",
+                        m.name, m.max_speed,
+                        (GE) ? "GE" : "Gb",
+                        m.bus,
+                        (GE) ? "FCoE Adapter" : "Fibre Channel Adapter");
 }
 
-/**************************************************/
-/*   lpfc_post_buffer                             */
-/*                                                */
-/*   This routine will post count buffers to the  */
-/*   ring with the QUE_RING_BUF_CN command. This  */
-/*   allows 3 buffers / command to be posted.     */
-/*   Returns the number of buffers NOT posted.    */
-/**************************************************/
+/**
+ * lpfc_post_buffer: Post IOCB(s) with DMA buffer descriptor(s) to a IOCB ring.
+ * @phba: pointer to lpfc hba data structure.
+ * @pring: pointer to a IOCB ring.
+ * @cnt: the number of IOCBs to be posted to the IOCB ring.
+ *
+ * This routine posts a given number of IOCBs with the associated DMA buffer
+ * descriptors specified by the cnt argument to the given IOCB ring.
+ *
+ * Return codes
+ *   The number of IOCBs NOT able to be posted to the IOCB ring.
+ **/
 int
 lpfc_post_buffer(struct lpfc_hba *phba, struct lpfc_sli_ring *pring, int cnt)
 {
@@ -1287,12 +1433,17 @@ lpfc_post_buffer(struct lpfc_hba *phba, struct lpfc_sli_ring *pring, int cnt)
         return 0;
 }
 
-/************************************************************************/
-/*                                                                      */
-/*   lpfc_post_rcv_buf                                                  */
-/*   This routine post initial rcv buffers to the configured rings      */
-/*                                                                      */
-/************************************************************************/
+/**
+ * lpfc_post_rcv_buf: Post the initial receive IOCB buffers to ELS ring.
+ * @phba: pointer to lpfc hba data structure.
+ *
+ * This routine posts initial receive IOCB buffers to the ELS ring. The
+ * current number of initial IOCB buffers specified by LPFC_BUF_RING0 is
+ * set to 64 IOCBs.
+ *
+ * Return codes
+ *   0 - success (currently always success)
+ **/
 static int
 lpfc_post_rcv_buf(struct lpfc_hba *phba)
 {
@@ -1307,11 +1458,13 @@ lpfc_post_rcv_buf(struct lpfc_hba *phba)
 
 #define S(N,V) (((V)<<(N))|((V)>>(32-(N))))
 
-/************************************************************************/
-/*                                                                      */
-/*   lpfc_sha_init                                                      */
-/*                                                                      */
-/************************************************************************/
+/**
+ * lpfc_sha_init: Set up initial array of hash table entries.
+ * @HashResultPointer: pointer to an array as hash table.
+ *
+ * This routine sets up the initial values to the array of hash table entries
+ * for the LC HBAs.
+ **/
 static void
 lpfc_sha_init(uint32_t * HashResultPointer)
 {
@@ -1322,11 +1475,16 @@ lpfc_sha_init(uint32_t * HashResultPointer)
         HashResultPointer[4] = 0xC3D2E1F0;
 }
 
-/************************************************************************/
-/*                                                                      */
-/*   lpfc_sha_iterate                                                   */
-/*                                                                      */
-/************************************************************************/
+/**
+ * lpfc_sha_iterate: Iterate initial hash table with the working hash table.
+ * @HashResultPointer: pointer to an initial/result hash table.
+ * @HashWorkingPointer: pointer to an working hash table.
+ *
+ * This routine iterates an initial hash table pointed by @HashResultPointer
+ * with the values from the working hash table pointeed by @HashWorkingPointer.
+ * The results are putting back to the initial hash table, returned through
+ * the @HashResultPointer as the result hash table.
+ **/
 static void
 lpfc_sha_iterate(uint32_t * HashResultPointer, uint32_t * HashWorkingPointer)
 {
@@ -1374,22 +1532,29 @@ lpfc_sha_iterate(uint32_t * HashResultPointer, uint32_t * HashWorkingPointer)
 
 }
 
-/************************************************************************/
-/*                                                                      */
-/*   lpfc_challenge_key                                                 */
-/*                                                                      */
-/************************************************************************/
+/**
+ * lpfc_challenge_key: Create challenge key based on WWPN of the HBA.
+ * @RandomChallenge: pointer to the entry of host challenge random number array.
+ * @HashWorking: pointer to the entry of the working hash array.
+ *
+ * This routine calculates the working hash array referred by @HashWorking
+ * from the challenge random numbers associated with the host, referred by
+ * @RandomChallenge. The result is put into the entry of the working hash
+ * array and returned by reference through @HashWorking.
+ **/
 static void
 lpfc_challenge_key(uint32_t * RandomChallenge, uint32_t * HashWorking)
 {
         *HashWorking = (*RandomChallenge ^ *HashWorking);
 }
 
-/************************************************************************/
-/*                                                                      */
-/*   lpfc_hba_init                                                      */
-/*                                                                      */
-/************************************************************************/
+/**
+ * lpfc_hba_init: Perform special handling for LC HBA initialization.
+ * @phba: pointer to lpfc hba data structure.
+ * @hbainit: pointer to an array of unsigned 32-bit integers.
+ *
+ * This routine performs the special handling for LC HBA initialization.
+ **/
 void
 lpfc_hba_init(struct lpfc_hba *phba, uint32_t *hbainit)
 {
@@ -1412,6 +1577,15 @@ lpfc_hba_init(struct lpfc_hba *phba, uint32_t *hbainit)
         kfree(HashWorking);
 }
 
+/**
+ * lpfc_cleanup: Performs vport cleanups before deleting a vport.
+ * @vport: pointer to a virtual N_Port data structure.
+ *
+ * This routine performs the necessary cleanups before deleting the @vport.
+ * It invokes the discovery state machine to perform necessary state
+ * transitions and to release the ndlps associated with the @vport. Note,
+ * the physical port is treated as @vport 0.
+ **/
 void
 lpfc_cleanup(struct lpfc_vport *vport)
 {
@@ -1459,14 +1633,6 @@ lpfc_cleanup(struct lpfc_vport *vport)
                 lpfc_disc_state_machine(vport, ndlp, NULL,
                                              NLP_EVT_DEVICE_RM);
 
-                /* nlp_type zero is not defined, nlp_flag zero also not defined,
-                 * nlp_state is unused, this happens when
-                 * an initiator has logged
-                 * into us so cleanup this ndlp.
-                 */
-                if ((ndlp->nlp_type == 0) && (ndlp->nlp_flag == 0) &&
-                        (ndlp->nlp_state == 0))
-                        lpfc_nlp_put(ndlp);
         }
 
         /* At this point, ALL ndlp's should be gone
@@ -1482,7 +1648,7 @@ lpfc_cleanup(struct lpfc_vport *vport)
                                                 &vport->fc_nodes, nlp_listp) {
                                 lpfc_printf_vlog(ndlp->vport, KERN_ERR,
                                                 LOG_NODE,
-                                                "0282: did:x%x ndlp:x%p "
+                                                "0282 did:x%x ndlp:x%p "
                                                 "usgmap:x%x refcnt:%d\n",
                                                 ndlp->nlp_DID, (void *)ndlp,
                                                 ndlp->nlp_usg_map,
@@ -1498,6 +1664,14 @@ lpfc_cleanup(struct lpfc_vport *vport)
         return;
 }
 
+/**
+ * lpfc_stop_vport_timers: Stop all the timers associated with a vport.
+ * @vport: pointer to a virtual N_Port data structure.
+ *
+ * This routine stops all the timers associated with a @vport. This function
+ * is invoked before disabling or deleting a @vport. Note that the physical
+ * port is treated as @vport 0.
+ **/
 void
 lpfc_stop_vport_timers(struct lpfc_vport *vport)
 {
@@ -1507,6 +1681,13 @@ lpfc_stop_vport_timers(struct lpfc_vport *vport)
         return;
 }
 
+/**
+ * lpfc_stop_phba_timers: Stop all the timers associated with an HBA.
+ * @phba: pointer to lpfc hba data structure.
+ *
+ * This routine stops all the timers associated with a HBA. This function is
+ * invoked before either putting a HBA offline or unloading the driver.
+ **/
 static void
 lpfc_stop_phba_timers(struct lpfc_hba *phba)
 {
@@ -1516,9 +1697,20 @@ lpfc_stop_phba_timers(struct lpfc_hba *phba)
         del_timer_sync(&phba->fabric_block_timer);
         phba->hb_outstanding = 0;
         del_timer_sync(&phba->hb_tmofunc);
+        del_timer_sync(&phba->eratt_poll);
         return;
 }
 
+/**
+ * lpfc_block_mgmt_io: Mark a HBA's management interface as blocked.
+ * @phba: pointer to lpfc hba data structure.
+ *
+ * This routine marks a HBA's management interface as blocked. Once the HBA's
+ * management interface is marked as blocked, all the user space access to
+ * the HBA, whether they are from sysfs interface or libdfc interface will
+ * all be blocked. The HBA is set to block the management interface when the
+ * driver prepares the HBA interface for online or offline.
+ **/
 static void
 lpfc_block_mgmt_io(struct lpfc_hba * phba)
 {
@@ -1529,6 +1721,18 @@ lpfc_block_mgmt_io(struct lpfc_hba * phba)
         spin_unlock_irqrestore(&phba->hbalock, iflag);
 }
 
+/**
+ * lpfc_online: Initialize and bring a HBA online.
+ * @phba: pointer to lpfc hba data structure.
+ *
+ * This routine initializes the HBA and brings a HBA online. During this
+ * process, the management interface is blocked to prevent user space access
+ * to the HBA interfering with the driver initialization.
+ *
+ * Return codes
+ *   0 - successful
+ *   1 - failed
+ **/
 int
 lpfc_online(struct lpfc_hba *phba)
 {
@@ -1574,6 +1778,17 @@ lpfc_online(struct lpfc_hba *phba)
         return 0;
 }
 
+/**
+ * lpfc_unblock_mgmt_io: Mark a HBA's management interface to be not blocked.
+ * @phba: pointer to lpfc hba data structure.
+ *
+ * This routine marks a HBA's management interface as not blocked. Once the
+ * HBA's management interface is marked as not blocked, all the user space
+ * access to the HBA, whether they are from sysfs interface or libdfc
+ * interface will be allowed. The HBA is set to block the management interface
+ * when the driver prepares the HBA interface for online or offline and then
+ * set to unblock the management interface afterwards.
+ **/
 void
 lpfc_unblock_mgmt_io(struct lpfc_hba * phba)
 {
@@ -1584,6 +1799,14 @@ lpfc_unblock_mgmt_io(struct lpfc_hba * phba)
         spin_unlock_irqrestore(&phba->hbalock, iflag);
 }
 
+/**
+ * lpfc_offline_prep: Prepare a HBA to be brought offline.
+ * @phba: pointer to lpfc hba data structure.
+ *
+ * This routine is invoked to prepare a HBA to be brought offline. It performs
+ * unregistration login to all the nodes on all vports and flushes the mailbox
+ * queue to make it ready to be brought offline.
+ **/
 void
 lpfc_offline_prep(struct lpfc_hba * phba)
 {
@@ -1633,6 +1856,14 @@ lpfc_offline_prep(struct lpfc_hba * phba)
         lpfc_sli_flush_mbox_queue(phba);
 }
 
+/**
+ * lpfc_offline: Bring a HBA offline.
+ * @phba: pointer to lpfc hba data structure.
+ *
+ * This routine actually brings a HBA offline. It stops all the timers
+ * associated with the HBA, brings down the SLI layer, and eventually
+ * marks the HBA as in offline state for the upper layer protocol.
+ **/
 void
 lpfc_offline(struct lpfc_hba *phba)
 {
@@ -1670,12 +1901,17 @@ lpfc_offline(struct lpfc_hba *phba)
         lpfc_destroy_vport_work_array(phba, vports);
 }
 
-/******************************************************************************
-* Function name: lpfc_scsi_free
-*
-* Description: Called from lpfc_pci_remove_one free internal driver resources
-*
-******************************************************************************/
+/**
+ * lpfc_scsi_free: Free all the SCSI buffers and IOCBs from driver lists.
+ * @phba: pointer to lpfc hba data structure.
+ *
+ * This routine is to free all the SCSI buffers and IOCBs from the driver
+ * list back to kernel. It is called from lpfc_pci_remove_one to free
+ * the internal resources before the device is removed from the system.
+ *
+ * Return codes
+ *   0 - successful (for now, it always returns 0)
+ **/
 static int
 lpfc_scsi_free(struct lpfc_hba *phba)
 {
@@ -1704,6 +1940,22 @@ lpfc_scsi_free(struct lpfc_hba *phba)
         return 0;
 }
 
+/**
+ * lpfc_create_port: Create an FC port.
+ * @phba: pointer to lpfc hba data structure.
+ * @instance: a unique integer ID to this FC port.
+ * @dev: pointer to the device data structure.
+ *
+ * This routine creates a FC port for the upper layer protocol. The FC port
+ * can be created on top of either a physical port or a virtual port provided
+ * by the HBA. This routine also allocates a SCSI host data structure (shost)
+ * and associates the FC port created before adding the shost into the SCSI
+ * layer.
+ *
+ * Return codes
+ *   @vport - pointer to the virtual N_Port data structure.
+ *   NULL - port create failed.
+ **/
 struct lpfc_vport *
 lpfc_create_port(struct lpfc_hba *phba, int instance, struct device *dev)
 {
@@ -1777,6 +2029,13 @@ out:
         return NULL;
 }
 
+/**
+ * destroy_port: Destroy an FC port.
+ * @vport: pointer to an lpfc virtual N_Port data structure.
+ *
+ * This routine destroys a FC port from the upper layer protocol. All the
+ * resources associated with the port are released.
+ **/
 void
 destroy_port(struct lpfc_vport *vport)
 {
@@ -1797,6 +2056,16 @@ destroy_port(struct lpfc_vport *vport)
         return;
 }
 
+/**
+ * lpfc_get_instance: Get a unique integer ID.
+ *
+ * This routine allocates a unique integer ID from lpfc_hba_index pool. It
+ * uses the kernel idr facility to perform the task.
+ *
+ * Return codes:
+ *   instance - a unique integer ID allocated as the new instance.
+ *   -1 - lpfc get instance failed.
+ **/
 int
 lpfc_get_instance(void)
 {
@@ -1810,11 +2079,21 @@ lpfc_get_instance(void)
         return instance;
 }
 
-/*
- * Note: there is no scan_start function as adapter initialization
- * will have asynchronously kicked off the link initialization.
- */
-
+/**
+ * lpfc_scan_finished: method for SCSI layer to detect whether scan is done.
+ * @shost: pointer to SCSI host data structure.
+ * @time: elapsed time of the scan in jiffies.
+ *
+ * This routine is called by the SCSI layer with a SCSI host to determine
+ * whether the scan host is finished.
+ *
+ * Note: there is no scan_start function as adapter initialization will have
+ * asynchronously kicked off the link initialization.
+ *
+ * Return codes
+ *   0 - SCSI host scan is not over yet.
+ *   1 - SCSI host scan is over.
+ **/
 int lpfc_scan_finished(struct Scsi_Host *shost, unsigned long time)
 {
         struct lpfc_vport *vport = (struct lpfc_vport *) shost->hostdata;
@@ -1858,6 +2137,13 @@ finished:
         return stat;
 }
 
+/**
+ * lpfc_host_attrib_init: Initialize SCSI host attributes on a FC port.
+ * @shost: pointer to SCSI host data structure.
+ *
+ * This routine initializes a given SCSI host attributes on a FC port. The
+ * SCSI host can be either on top of a physical port or a virtual port.
+ **/
 void lpfc_host_attrib_init(struct Scsi_Host *shost)
 {
         struct lpfc_vport *vport = (struct lpfc_vport *) shost->hostdata;
@@ -1906,42 +2192,157 @@ void lpfc_host_attrib_init(struct Scsi_Host *shost)
         spin_unlock_irq(shost->host_lock);
 }
 
+/**
+ * lpfc_enable_msix: Enable MSI-X interrupt mode.
+ * @phba: pointer to lpfc hba data structure.
+ *
+ * This routine is invoked to enable the MSI-X interrupt vectors. The kernel
+ * function pci_enable_msix() is called to enable the MSI-X vectors. Note that
+ * pci_enable_msix(), once invoked, enables either all or nothing, depending
+ * on the current availability of PCI vector resources. The device driver is
+ * responsible for calling the individual request_irq() to register each MSI-X
+ * vector with a interrupt handler, which is done in this function. Note that
+ * later when device is unloading, the driver should always call free_irq()
+ * on all MSI-X vectors it has done request_irq() on before calling
+ * pci_disable_msix(). Failure to do so results in a BUG_ON() and a device
+ * will be left with MSI-X enabled and leaks its vectors.
+ *
+ * Return codes
+ *   0 - sucessful
+ *   other values - error
+ **/
 static int
 lpfc_enable_msix(struct lpfc_hba *phba)
 {
-        int error;
+        int rc, i;
+        LPFC_MBOXQ_t *pmb;
 
-        phba->msix_entries[0].entry = 0;
-        phba->msix_entries[0].vector = 0;
+        /* Set up MSI-X multi-message vectors */
+        for (i = 0; i < LPFC_MSIX_VECTORS; i++)
+                phba->msix_entries[i].entry = i;
 
-        error = pci_enable_msix(phba->pcidev, phba->msix_entries,
+        /* Configure MSI-X capability structure */
+        rc = pci_enable_msix(phba->pcidev, phba->msix_entries,
                                 ARRAY_SIZE(phba->msix_entries));
-        if (error) {
+        if (rc) {
                 lpfc_printf_log(phba, KERN_INFO, LOG_INIT,
                                 "0420 Enable MSI-X failed (%d), continuing "
-                                "with MSI\n", error);
-                pci_disable_msix(phba->pcidev);
-                return error;
+                                "with MSI\n", rc);
+                goto msi_fail_out;
+        } else
+                for (i = 0; i < LPFC_MSIX_VECTORS; i++)
+                        lpfc_printf_log(phba, KERN_INFO, LOG_INIT,
+                                        "0477 MSI-X entry[%d]: vector=x%x "
+                                        "message=%d\n", i,
+                                        phba->msix_entries[i].vector,
+                                        phba->msix_entries[i].entry);
+        /*
+         * Assign MSI-X vectors to interrupt handlers
+         */
+
+        /* vector-0 is associated to slow-path handler */
+        rc = request_irq(phba->msix_entries[0].vector, &lpfc_sp_intr_handler,
+                         IRQF_SHARED, LPFC_SP_DRIVER_HANDLER_NAME, phba);
+        if (rc) {
+                lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
+                                "0421 MSI-X slow-path request_irq failed "
+                                "(%d), continuing with MSI\n", rc);
+                goto msi_fail_out;
         }
 
-        error = request_irq(phba->msix_entries[0].vector, lpfc_intr_handler, 0,
-                            LPFC_DRIVER_NAME, phba);
-        if (error) {
+        /* vector-1 is associated to fast-path handler */
+        rc = request_irq(phba->msix_entries[1].vector, &lpfc_fp_intr_handler,
+                         IRQF_SHARED, LPFC_FP_DRIVER_HANDLER_NAME, phba);
+
+        if (rc) {
                 lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
-                                "0421 MSI-X request_irq failed (%d), "
-                                "continuing with MSI\n", error);
-                pci_disable_msix(phba->pcidev);
+                                "0429 MSI-X fast-path request_irq failed "
+                                "(%d), continuing with MSI\n", rc);
+                goto irq_fail_out;
         }
-        return error;
+
+        /*
+         * Configure HBA MSI-X attention conditions to messages
+         */
+        pmb = (LPFC_MBOXQ_t *) mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
+
+        if (!pmb) {
+                rc = -ENOMEM;
+                lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
+                                "0474 Unable to allocate memory for issuing "
+                                "MBOX_CONFIG_MSI command\n");
+                goto mem_fail_out;
+        }
+        rc = lpfc_config_msi(phba, pmb);
+        if (rc)
+                goto mbx_fail_out;
+        rc = lpfc_sli_issue_mbox(phba, pmb, MBX_POLL);
+        if (rc != MBX_SUCCESS) {
+                lpfc_printf_log(phba, KERN_ERR, LOG_MBOX,
+                                "0351 Config MSI mailbox command failed, "
+                                "mbxCmd x%x, mbxStatus x%x\n",
+                                pmb->mb.mbxCommand, pmb->mb.mbxStatus);
+                goto mbx_fail_out;
+        }
+
+        /* Free memory allocated for mailbox command */
+        mempool_free(pmb, phba->mbox_mem_pool);
+        return rc;
+
+mbx_fail_out:
+        /* Free memory allocated for mailbox command */
+        mempool_free(pmb, phba->mbox_mem_pool);
+
+mem_fail_out:
+        /* free the irq already requested */
+        free_irq(phba->msix_entries[1].vector, phba);
+
+irq_fail_out:
+        /* free the irq already requested */
+        free_irq(phba->msix_entries[0].vector, phba);
+
+msi_fail_out:
+        /* Unconfigure MSI-X capability structure */
+        pci_disable_msix(phba->pcidev);
+        return rc;
 }
 
+/**
+ * lpfc_disable_msix: Disable MSI-X interrupt mode.
+ * @phba: pointer to lpfc hba data structure.
+ *
+ * This routine is invoked to release the MSI-X vectors and then disable the
+ * MSI-X interrupt mode.
+ **/
 static void
 lpfc_disable_msix(struct lpfc_hba *phba)
 {
-        free_irq(phba->msix_entries[0].vector, phba);
+        int i;
+
+        /* Free up MSI-X multi-message vectors */
+        for (i = 0; i < LPFC_MSIX_VECTORS; i++)
+                free_irq(phba->msix_entries[i].vector, phba);
+        /* Disable MSI-X */
         pci_disable_msix(phba->pcidev);
 }
 
+/**
+ * lpfc_pci_probe_one: lpfc PCI probe func to register device to PCI subsystem.
+ * @pdev: pointer to PCI device
+ * @pid: pointer to PCI device identifier
+ *
+ * This routine is to be registered to the kernel's PCI subsystem. When an
+ * Emulex HBA is presented in PCI bus, the kernel PCI subsystem looks at
+ * PCI device-specific information of the device and driver to see if the
+ * driver state that it can support this kind of device. If the match is
+ * successful, the driver core invokes this routine. If this routine
+ * determines it can claim the HBA, it does all the initialization that it
+ * needs to do to handle the HBA properly.
+ *
+ * Return code
+ *   0 - driver can claim the device
+ *   negative value - driver can not claim the device
+ **/
 static int __devinit
 lpfc_pci_probe_one(struct pci_dev *pdev, const struct pci_device_id *pid)
 {
@@ -1956,6 +2357,7 @@ lpfc_pci_probe_one(struct pci_dev *pdev, const struct pci_device_id *pid)
         int  i, hbq_count;
         uint16_t iotag;
         int bars = pci_select_bars(pdev, IORESOURCE_MEM);
+        struct lpfc_adapter_event_header adapter_event;
 
         if (pci_enable_device_mem(pdev))
                 goto out;
@@ -1966,6 +2368,7 @@ lpfc_pci_probe_one(struct pci_dev *pdev, const struct pci_device_id *pid)
         if (!phba)
                 goto out_release_regions;
 
+        atomic_set(&phba->fast_event_count, 0);
         spin_lock_init(&phba->hbalock);
 
         /* Initialize ndlp management spinlock */
@@ -1978,6 +2381,7 @@ lpfc_pci_probe_one(struct pci_dev *pdev, const struct pci_device_id *pid)
                 goto out_free_phba;
 
         INIT_LIST_HEAD(&phba->port_list);
+        init_waitqueue_head(&phba->wait_4_mlo_m_q);
         /*
          * Get all the module params for configuring this host and then
          * establish the host.
@@ -2000,6 +2404,9 @@ lpfc_pci_probe_one(struct pci_dev *pdev, const struct pci_device_id *pid)
         init_timer(&phba->fabric_block_timer);
         phba->fabric_block_timer.function = lpfc_fabric_block_timeout;
         phba->fabric_block_timer.data = (unsigned long) phba;
+        init_timer(&phba->eratt_poll);
+        phba->eratt_poll.function = lpfc_poll_eratt;
+        phba->eratt_poll.data = (unsigned long) phba;
 
         pci_set_master(pdev);
         pci_try_set_mwi(pdev);
@@ -2019,7 +2426,7 @@ lpfc_pci_probe_one(struct pci_dev *pdev, const struct pci_device_id *pid)
         bar2map_len        = pci_resource_len(phba->pcidev, 2);
 
         /* Map HBA SLIM to a kernel virtual address. */
-        phba->slim_memmap_p      = ioremap(phba->pci_bar0_map, bar0map_len);
+        phba->slim_memmap_p = ioremap(phba->pci_bar0_map, bar0map_len);
         if (!phba->slim_memmap_p) {
                 error = -ENODEV;
                 dev_printk(KERN_ERR, &pdev->dev,
@@ -2037,12 +2444,18 @@ lpfc_pci_probe_one(struct pci_dev *pdev, const struct pci_device_id *pid)
         }
 
         /* Allocate memory for SLI-2 structures */
-        phba->slim2p = dma_alloc_coherent(&phba->pcidev->dev, SLI2_SLIM_SIZE,
-                                          &phba->slim2p_mapping, GFP_KERNEL);
-        if (!phba->slim2p)
+        phba->slim2p.virt = dma_alloc_coherent(&phba->pcidev->dev,
+                                               SLI2_SLIM_SIZE,
+                                               &phba->slim2p.phys,
+                                               GFP_KERNEL);
+        if (!phba->slim2p.virt)
                 goto out_iounmap;
 
-        memset(phba->slim2p, 0, SLI2_SLIM_SIZE);
+        memset(phba->slim2p.virt, 0, SLI2_SLIM_SIZE);
+        phba->mbox = phba->slim2p.virt + offsetof(struct lpfc_sli2_slim, mbx);
+        phba->pcb = (phba->slim2p.virt + offsetof(struct lpfc_sli2_slim, pcb));
+        phba->IOCBs = (phba->slim2p.virt +
+                       offsetof(struct lpfc_sli2_slim, IOCBs));
 
         phba->hbqslimp.virt = dma_alloc_coherent(&phba->pcidev->dev,
                                                  lpfc_sli_hbq_size(),
@@ -2111,7 +2524,7 @@ lpfc_pci_probe_one(struct pci_dev *pdev, const struct pci_device_id *pid)
         phba->fc_arbtov = FF_DEF_ARBTOV;
 
         INIT_LIST_HEAD(&phba->work_list);
-        phba->work_ha_mask = (HA_ERATT|HA_MBATT|HA_LATT);
+        phba->work_ha_mask = (HA_ERATT | HA_MBATT | HA_LATT);
         phba->work_ha_mask |= (HA_RXMASK << (LPFC_ELS_RING * 4));
 
         /* Initialize the wait queue head for the kernel thread */
@@ -2146,21 +2559,42 @@ lpfc_pci_probe_one(struct pci_dev *pdev, const struct pci_device_id *pid)
         pci_set_drvdata(pdev, shost);
         phba->intr_type = NONE;
 
+        phba->MBslimaddr = phba->slim_memmap_p;
+        phba->HAregaddr = phba->ctrl_regs_memmap_p + HA_REG_OFFSET;
+        phba->CAregaddr = phba->ctrl_regs_memmap_p + CA_REG_OFFSET;
+        phba->HSregaddr = phba->ctrl_regs_memmap_p + HS_REG_OFFSET;
+        phba->HCregaddr = phba->ctrl_regs_memmap_p + HC_REG_OFFSET;
+
+        /* Configure and enable interrupt */
         if (phba->cfg_use_msi == 2) {
-                error = lpfc_enable_msix(phba);
-                if (!error)
-                        phba->intr_type = MSIX;
+                /* Need to issue conf_port mbox cmd before conf_msi mbox cmd */
+                error = lpfc_sli_config_port(phba, 3);
+                if (error)
+                        lpfc_printf_log(phba, KERN_INFO, LOG_INIT,
+                                "0427 Firmware not capable of SLI 3 mode.\n");
+                else {
+                        lpfc_printf_log(phba, KERN_INFO, LOG_INIT,
+                                "0426 Firmware capable of SLI 3 mode.\n");
+                        /* Now, try to enable MSI-X interrupt mode */
+                        error = lpfc_enable_msix(phba);
+                        if (!error) {
+                                phba->intr_type = MSIX;
+                                lpfc_printf_log(phba, KERN_INFO, LOG_INIT,
+                                                "0430 enable MSI-X mode.\n");
+                        }
+                }
         }
 
         /* Fallback to MSI if MSI-X initialization failed */
         if (phba->cfg_use_msi >= 1 && phba->intr_type == NONE) {
                 retval = pci_enable_msi(phba->pcidev);
-                if (!retval)
+                if (!retval) {
                         phba->intr_type = MSI;
-                else
                         lpfc_printf_log(phba, KERN_INFO, LOG_INIT,
-                                        "0452 Enable MSI failed, continuing "
-                                        "with IRQ\n");
+                                        "0473 enable MSI mode.\n");
+                } else
+                        lpfc_printf_log(phba, KERN_INFO, LOG_INIT,
+                                        "0452 enable IRQ mode.\n");
         }
 
         /* MSI-X is the only case the doesn't need to call request_irq */
@@ -2176,18 +2610,16 @@ lpfc_pci_probe_one(struct pci_dev *pdev, const struct pci_device_id *pid)
                         phba->intr_type = INTx;
         }
 
-        phba->MBslimaddr = phba->slim_memmap_p;
-        phba->HAregaddr = phba->ctrl_regs_memmap_p + HA_REG_OFFSET;
-        phba->CAregaddr = phba->ctrl_regs_memmap_p + CA_REG_OFFSET;
-        phba->HSregaddr = phba->ctrl_regs_memmap_p + HS_REG_OFFSET;
-        phba->HCregaddr = phba->ctrl_regs_memmap_p + HC_REG_OFFSET;
-
         if (lpfc_alloc_sysfs_attr(vport)) {
+                lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
+                                "1476 Failed to allocate sysfs attr\n");
                 error = -ENOMEM;
                 goto out_free_irq;
         }
 
         if (lpfc_sli_hba_setup(phba)) {
+                lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
+                                "1477 Failed to set up hba\n");
                 error = -ENODEV;
                 goto out_remove_device;
         }
@@ -2206,6 +2638,16 @@ lpfc_pci_probe_one(struct pci_dev *pdev, const struct pci_device_id *pid)
                 spin_unlock_irq(shost->host_lock);
         }
 
+        lpfc_printf_log(phba, KERN_INFO, LOG_INIT,
+                        "0428 Perform SCSI scan\n");
+        /* Send board arrival event to upper layer */
+        adapter_event.event_type = FC_REG_ADAPTER_EVENT;
+        adapter_event.subcategory = LPFC_EVENT_ARRIVAL;
+        fc_host_post_vendor_event(shost, fc_get_event_number(),
+                sizeof(adapter_event),
+                (char *) &adapter_event,
+                SCSI_NL_VID_TYPE_PCI | PCI_VENDOR_ID_EMULEX);
+
         scsi_scan_host(shost);
 
         return 0;
@@ -2238,11 +2680,11 @@ out_free_iocbq:
         }
         lpfc_mem_free(phba);
 out_free_hbqslimp:
-        dma_free_coherent(&pdev->dev, lpfc_sli_hbq_size(), phba->hbqslimp.virt,
-                          phba->hbqslimp.phys);
+        dma_free_coherent(&pdev->dev, lpfc_sli_hbq_size(),
+                          phba->hbqslimp.virt, phba->hbqslimp.phys);
 out_free_slim:
-        dma_free_coherent(&pdev->dev, SLI2_SLIM_SIZE, phba->slim2p,
-                                                        phba->slim2p_mapping);
+        dma_free_coherent(&pdev->dev, SLI2_SLIM_SIZE,
+                          phba->slim2p.virt, phba->slim2p.phys);
 out_iounmap:
         iounmap(phba->ctrl_regs_memmap_p);
 out_iounmap_slim:
@@ -2262,6 +2704,14 @@ out:
         return error;
 }
 
+/**
+ * lpfc_pci_remove_one: lpfc PCI func to unregister device from PCI subsystem.
+ * @pdev: pointer to PCI device
+ *
+ * This routine is to be registered to the kernel's PCI subsystem. When an
+ * Emulex HBA is removed from PCI bus. It perform all the necessary cleanup
+ * for the HBA device to be removed from the PCI subsystem properly.
+ **/
 static void __devexit
 lpfc_pci_remove_one(struct pci_dev *pdev)
 {
@@ -2316,12 +2766,12 @@ lpfc_pci_remove_one(struct pci_dev *pdev)
         lpfc_scsi_free(phba);
         lpfc_mem_free(phba);
 
-        dma_free_coherent(&pdev->dev, lpfc_sli_hbq_size(), phba->hbqslimp.virt,
-                          phba->hbqslimp.phys);
+        dma_free_coherent(&pdev->dev, lpfc_sli_hbq_size(),
+                          phba->hbqslimp.virt, phba->hbqslimp.phys);
 
         /* Free resources associated with SLI2 interface */
         dma_free_coherent(&pdev->dev, SLI2_SLIM_SIZE,
-                          phba->slim2p, phba->slim2p_mapping);
+                          phba->slim2p.virt, phba->slim2p.phys);
 
         /* unmap adapter SLIM and Control Registers */
         iounmap(phba->ctrl_regs_memmap_p);
@@ -2336,13 +2786,21 @@ lpfc_pci_remove_one(struct pci_dev *pdev)
 }
 
 /**
- * lpfc_io_error_detected - called when PCI error is detected
- * @pdev: Pointer to PCI device
- * @state: The current pci conneection state
+ * lpfc_io_error_detected: Driver method for handling PCI I/O error detected.
+ * @pdev: pointer to PCI device.
+ * @state: the current PCI connection state.
  *
- * This function is called after a PCI bus error affecting
- * this device has been detected.
- */
+ * This routine is registered to the PCI subsystem for error handling. This
+ * function is called by the PCI subsystem after a PCI bus error affecting
+ * this device has been detected. When this function is invoked, it will
+ * need to stop all the I/Os and interrupt(s) to the device. Once that is
+ * done, it will return PCI_ERS_RESULT_NEED_RESET for the PCI subsystem to
+ * perform proper recovery as desired.
+ *
+ * Return codes
+ *   PCI_ERS_RESULT_NEED_RESET - need to reset before recovery
+ *   PCI_ERS_RESULT_DISCONNECT - device could not be recovered
+ **/
 static pci_ers_result_t lpfc_io_error_detected(struct pci_dev *pdev,
                                 pci_channel_state_t state)
 {
@@ -2351,8 +2809,15 @@ static pci_ers_result_t lpfc_io_error_detected(struct pci_dev *pdev,
         struct lpfc_sli *psli = &phba->sli;
         struct lpfc_sli_ring  *pring;
 
-        if (state == pci_channel_io_perm_failure)
+        if (state == pci_channel_io_perm_failure) {
+                lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
+                                "0472 PCI channel I/O permanent failure\n");
+                /* Block all SCSI devices' I/Os on the host */
+                lpfc_scsi_dev_block(phba);
+                /* Clean up all driver's outstanding SCSI I/Os */
+                lpfc_sli_flush_fcp_rings(phba);
                 return PCI_ERS_RESULT_DISCONNECT;
+        }
 
         pci_disable_device(pdev);
         /*
@@ -2376,10 +2841,21 @@ static pci_ers_result_t lpfc_io_error_detected(struct pci_dev *pdev,
 }
 
 /**
- * lpfc_io_slot_reset - called after the pci bus has been reset.
- * @pdev: Pointer to PCI device
+ * lpfc_io_slot_reset: Restart a PCI device from scratch.
+ * @pdev: pointer to PCI device.
+ *
+ * This routine is registered to the PCI subsystem for error handling. This is
+ * called after PCI bus has been reset to restart the PCI card from scratch,
+ * as if from a cold-boot. During the PCI subsystem error recovery, after the
+ * driver returns PCI_ERS_RESULT_NEED_RESET, the PCI subsystem will perform
+ * proper error recovery and then call this routine before calling the .resume
+ * method to recover the device. This function will initialize the HBA device,
+ * enable the interrupt, but it will just put the HBA to offline state without
+ * passing any I/O traffic.
  *
- * Restart the card from scratch, as if from a cold-boot.
+ * Return codes
+ *   PCI_ERS_RESULT_RECOVERED - the device has been recovered
+ *   PCI_ERS_RESULT_DISCONNECT - device could not be recovered
  */
 static pci_ers_result_t lpfc_io_slot_reset(struct pci_dev *pdev)
 {
@@ -2404,20 +2880,34 @@ static pci_ers_result_t lpfc_io_slot_reset(struct pci_dev *pdev)
         /* Enable configured interrupt method */
         phba->intr_type = NONE;
         if (phba->cfg_use_msi == 2) {
-                error = lpfc_enable_msix(phba);
-                if (!error)
-                        phba->intr_type = MSIX;
+                /* Need to issue conf_port mbox cmd before conf_msi mbox cmd */
+                error = lpfc_sli_config_port(phba, 3);
+                if (error)
+                        lpfc_printf_log(phba, KERN_INFO, LOG_INIT,
+                                "0478 Firmware not capable of SLI 3 mode.\n");
+                else {
+                        lpfc_printf_log(phba, KERN_INFO, LOG_INIT,
+                                "0479 Firmware capable of SLI 3 mode.\n");
+                        /* Now, try to enable MSI-X interrupt mode */
+                        error = lpfc_enable_msix(phba);
+                        if (!error) {
+                                phba->intr_type = MSIX;
+                                lpfc_printf_log(phba, KERN_INFO, LOG_INIT,
+                                                "0480 enable MSI-X mode.\n");
+                        }
+                }
         }
 
         /* Fallback to MSI if MSI-X initialization failed */
         if (phba->cfg_use_msi >= 1 && phba->intr_type == NONE) {
                 retval = pci_enable_msi(phba->pcidev);
-                if (!retval)
+                if (!retval) {
                         phba->intr_type = MSI;
-                else
                         lpfc_printf_log(phba, KERN_INFO, LOG_INIT,
-                                        "0470 Enable MSI failed, continuing "
-                                        "with IRQ\n");
+                                        "0481 enable MSI mode.\n");
+                } else
+                        lpfc_printf_log(phba, KERN_INFO, LOG_INIT,
+                                        "0470 enable IRQ mode.\n");
         }
 
         /* MSI-X is the only case the doesn't need to call request_irq */
@@ -2440,11 +2930,13 @@ static pci_ers_result_t lpfc_io_slot_reset(struct pci_dev *pdev)
 }
 
 /**
- * lpfc_io_resume - called when traffic can start flowing again.
- * @pdev: Pointer to PCI device
+ * lpfc_io_resume: Resume PCI I/O operation.
+ * @pdev: pointer to PCI device
  *
- * This callback is called when the error recovery driver tells us that
- * its OK to resume normal operation.
+ * This routine is registered to the PCI subsystem for error handling. It is
+ * called when kernel error recovery tells the lpfc driver that it is ok to
+ * resume normal PCI operation after PCI bus error recovery. After this call,
+ * traffic can start to flow from this device again.
  */
 static void lpfc_io_resume(struct pci_dev *pdev)
 {
@@ -2491,6 +2983,8 @@ static struct pci_device_id lpfc_id_table[] = {
                 PCI_ANY_ID, PCI_ANY_ID, },
         {PCI_VENDOR_ID_EMULEX, PCI_DEVICE_ID_ZEPHYR,
                 PCI_ANY_ID, PCI_ANY_ID, },
+        {PCI_VENDOR_ID_EMULEX, PCI_DEVICE_ID_HORNET,
+                PCI_ANY_ID, PCI_ANY_ID, },
         {PCI_VENDOR_ID_EMULEX, PCI_DEVICE_ID_ZEPHYR_SCSP,
                 PCI_ANY_ID, PCI_ANY_ID, },
         {PCI_VENDOR_ID_EMULEX, PCI_DEVICE_ID_ZEPHYR_DCSP,
@@ -2521,6 +3015,12 @@ static struct pci_device_id lpfc_id_table[] = {
                 PCI_ANY_ID, PCI_ANY_ID, },
         {PCI_VENDOR_ID_EMULEX, PCI_DEVICE_ID_SAT_S,
                 PCI_ANY_ID, PCI_ANY_ID, },
+        {PCI_VENDOR_ID_EMULEX, PCI_DEVICE_ID_PROTEUS_VF,
+                PCI_ANY_ID, PCI_ANY_ID, },
+        {PCI_VENDOR_ID_EMULEX, PCI_DEVICE_ID_PROTEUS_PF,
+                PCI_ANY_ID, PCI_ANY_ID, },
+        {PCI_VENDOR_ID_EMULEX, PCI_DEVICE_ID_PROTEUS_S,
+                PCI_ANY_ID, PCI_ANY_ID, },
         { 0 }
 };
 
@@ -2540,6 +3040,18 @@ static struct pci_driver lpfc_driver = {
         .err_handler    = &lpfc_err_handler,
 };
 
+/**
+ * lpfc_init: lpfc module initialization routine.
+ *
+ * This routine is to be invoked when the lpfc module is loaded into the
+ * kernel. The special kernel macro module_init() is used to indicate the
+ * role of this routine to the kernel as lpfc module entry point.
+ *
+ * Return codes
+ *   0 - successful
+ *   -ENOMEM - FC attach transport failed
+ *   all others - failed
+ */
 static int __init
 lpfc_init(void)
 {
@@ -2567,12 +3079,20 @@ lpfc_init(void)
         error = pci_register_driver(&lpfc_driver);
         if (error) {
                 fc_release_transport(lpfc_transport_template);
-                fc_release_transport(lpfc_vport_transport_template);
+                if (lpfc_enable_npiv)
+                        fc_release_transport(lpfc_vport_transport_template);
         }
 
         return error;
 }
 
+/**
+ * lpfc_exit: lpfc module removal routine.
+ *
+ * This routine is invoked when the lpfc module is removed from the kernel.
+ * The special kernel macro module_exit() is used to indicate the role of
+ * this routine to the kernel as lpfc module exit point.
+ */
 static void __exit
 lpfc_exit(void)
 {
diff --git a/drivers/scsi/lpfc/lpfc_mbox.c b/drivers/scsi/lpfc/lpfc_mbox.c
index 7a9be4c5b7cb..7465fe746fe9 100644
--- a/drivers/scsi/lpfc/lpfc_mbox.c
+++ b/drivers/scsi/lpfc/lpfc_mbox.c
@@ -1,7 +1,7 @@
 /*******************************************************************
  * This file is part of the Emulex Linux Device Driver for         *
  * Fibre Channel Host Bus Adapters.                                *
- * Copyright (C) 2004-2007 Emulex.  All rights reserved.           *
+ * Copyright (C) 2004-2008 Emulex.  All rights reserved.           *
  * EMULEX and SLI are trademarks of Emulex.                        *
  * www.emulex.com                                                  *
  * Portions Copyright (C) 2004-2005 Christoph Hellwig              *
@@ -30,6 +30,7 @@
 
 #include "lpfc_hw.h"
 #include "lpfc_sli.h"
+#include "lpfc_nl.h"
 #include "lpfc_disc.h"
 #include "lpfc_scsi.h"
 #include "lpfc.h"
@@ -37,10 +38,20 @@
 #include "lpfc_crtn.h"
 #include "lpfc_compat.h"
 
-/**********************************************/
-
-/*                mailbox command             */
-/**********************************************/
+/**
+ * lpfc_dump_mem: Prepare a mailbox command for retrieving HBA's VPD memory.
+ * @phba: pointer to lpfc hba data structure.
+ * @pmb: pointer to the driver internal queue element for mailbox command.
+ * @offset: offset for dumping VPD memory mailbox command.
+ *
+ * The dump mailbox command provides a method for the device driver to obtain
+ * various types of information from the HBA device.
+ *
+ * This routine prepares the mailbox command for dumping HBA Vital Product
+ * Data (VPD) memory. This mailbox command is to be used for retrieving a
+ * portion (DMP_RSP_SIZE bytes) of a HBA's VPD from the HBA at an address
+ * offset specified by the offset parameter.
+ **/
 void
 lpfc_dump_mem(struct lpfc_hba * phba, LPFC_MBOXQ_t * pmb, uint16_t offset)
 {
@@ -65,10 +76,17 @@ lpfc_dump_mem(struct lpfc_hba * phba, LPFC_MBOXQ_t * pmb, uint16_t offset)
         return;
 }
 
-/**********************************************/
-/*  lpfc_read_nv  Issue a READ NVPARAM        */
-/*                mailbox command             */
-/**********************************************/
+/**
+ * lpfc_read_nv: Prepare a mailbox command for reading HBA's NVRAM param.
+ * @phba: pointer to lpfc hba data structure.
+ * @pmb: pointer to the driver internal queue element for mailbox command.
+ *
+ * The read NVRAM mailbox command returns the HBA's non-volatile parameters
+ * that are used as defaults when the Fibre Channel link is brought on-line.
+ *
+ * This routine prepares the mailbox command for reading information stored
+ * in the HBA's NVRAM. Specifically, the HBA's WWNN and WWPN.
+ **/
 void
 lpfc_read_nv(struct lpfc_hba * phba, LPFC_MBOXQ_t * pmb)
 {
@@ -81,10 +99,19 @@ lpfc_read_nv(struct lpfc_hba * phba, LPFC_MBOXQ_t * pmb)
         return;
 }
 
-/**********************************************/
-/*  lpfc_config_async  Issue a                */
-/*  MBX_ASYNC_EVT_ENABLE mailbox command      */
-/**********************************************/
+/**
+ * lpfc_config_async: Prepare a mailbox command for enabling HBA async event.
+ * @phba: pointer to lpfc hba data structure.
+ * @pmb: pointer to the driver internal queue element for mailbox command.
+ * @ring: ring number for the asynchronous event to be configured.
+ *
+ * The asynchronous event enable mailbox command is used to enable the
+ * asynchronous event posting via the ASYNC_STATUS_CN IOCB response and
+ * specifies the default ring to which events are posted.
+ *
+ * This routine prepares the mailbox command for enabling HBA asynchronous
+ * event support on a IOCB ring.
+ **/
 void
 lpfc_config_async(struct lpfc_hba * phba, LPFC_MBOXQ_t * pmb,
                 uint32_t ring)
@@ -99,10 +126,19 @@ lpfc_config_async(struct lpfc_hba * phba, LPFC_MBOXQ_t * pmb,
         return;
 }
 
-/**********************************************/
-/*  lpfc_heart_beat  Issue a HEART_BEAT       */
-/*                mailbox command             */
-/**********************************************/
+/**
+ * lpfc_heart_beat: Prepare a mailbox command for heart beat.
+ * @phba: pointer to lpfc hba data structure.
+ * @pmb: pointer to the driver internal queue element for mailbox command.
+ *
+ * The heart beat mailbox command is used to detect an unresponsive HBA, which
+ * is defined as any device where no error attention is sent and both mailbox
+ * and rings are not processed.
+ *
+ * This routine prepares the mailbox command for issuing a heart beat in the
+ * form of mailbox command to the HBA. The timely completion of the heart
+ * beat mailbox command indicates the health of the HBA.
+ **/
 void
 lpfc_heart_beat(struct lpfc_hba * phba, LPFC_MBOXQ_t * pmb)
 {
@@ -115,10 +151,26 @@ lpfc_heart_beat(struct lpfc_hba * phba, LPFC_MBOXQ_t * pmb)
         return;
 }
 
-/**********************************************/
-/*  lpfc_read_la  Issue a READ LA             */
-/*                mailbox command             */
-/**********************************************/
+/**
+ * lpfc_read_la: Prepare a mailbox command for reading HBA link attention.
+ * @phba: pointer to lpfc hba data structure.
+ * @pmb: pointer to the driver internal queue element for mailbox command.
+ * @mp: DMA buffer memory for reading the link attention information into.
+ *
+ * The read link attention mailbox command is issued to read the Link Event
+ * Attention information indicated by the HBA port when the Link Event bit
+ * of the Host Attention (HSTATT) register is set to 1. A Link Event
+ * Attention occurs based on an exception detected at the Fibre Channel link
+ * interface.
+ *
+ * This routine prepares the mailbox command for reading HBA link attention
+ * information. A DMA memory has been set aside and address passed to the
+ * HBA through @mp for the HBA to DMA link attention information into the
+ * memory as part of the execution of the mailbox command.
+ *
+ * Return codes
+ *    0 - Success (currently always return 0)
+ **/
 int
 lpfc_read_la(struct lpfc_hba * phba, LPFC_MBOXQ_t * pmb, struct lpfc_dmabuf *mp)
 {
@@ -143,10 +195,21 @@ lpfc_read_la(struct lpfc_hba * phba, LPFC_MBOXQ_t * pmb, struct lpfc_dmabuf *mp)
         return (0);
 }
 
-/**********************************************/
-/*  lpfc_clear_la  Issue a CLEAR LA           */
-/*                 mailbox command            */
-/**********************************************/
+/**
+ * lpfc_clear_la: Prepare a mailbox command for clearing HBA link attention.
+ * @phba: pointer to lpfc hba data structure.
+ * @pmb: pointer to the driver internal queue element for mailbox command.
+ *
+ * The clear link attention mailbox command is issued to clear the link event
+ * attention condition indicated by the Link Event bit of the Host Attention
+ * (HSTATT) register. The link event attention condition is cleared only if
+ * the event tag specified matches that of the current link event counter.
+ * The current event tag is read using the read link attention event mailbox
+ * command.
+ *
+ * This routine prepares the mailbox command for clearing HBA link attention
+ * information.
+ **/
 void
 lpfc_clear_la(struct lpfc_hba * phba, LPFC_MBOXQ_t * pmb)
 {
@@ -161,10 +224,20 @@ lpfc_clear_la(struct lpfc_hba * phba, LPFC_MBOXQ_t * pmb)
         return;
 }
 
-/**************************************************/
-/*  lpfc_config_link  Issue a CONFIG LINK         */
-/*                    mailbox command             */
-/**************************************************/
+/**
+ * lpfc_config_link: Prepare a mailbox command for configuring link on a HBA.
+ * @phba: pointer to lpfc hba data structure.
+ * @pmb: pointer to the driver internal queue element for mailbox command.
+ *
+ * The configure link mailbox command is used before the initialize link
+ * mailbox command to override default value and to configure link-oriented
+ * parameters such as DID address and various timers. Typically, this
+ * command would be used after an F_Port login to set the returned DID address
+ * and the fabric timeout values. This command is not valid before a configure
+ * port command has configured the HBA port.
+ *
+ * This routine prepares the mailbox command for configuring link on a HBA.
+ **/
 void
 lpfc_config_link(struct lpfc_hba * phba, LPFC_MBOXQ_t * pmb)
 {
@@ -199,10 +272,98 @@ lpfc_config_link(struct lpfc_hba * phba, LPFC_MBOXQ_t * pmb)
         return;
 }
 
-/**********************************************/
-/*  lpfc_init_link  Issue an INIT LINK        */
-/*                  mailbox command           */
-/**********************************************/
+/**
+ * lpfc_config_msi: Prepare a mailbox command for configuring msi-x.
+ * @phba: pointer to lpfc hba data structure.
+ * @pmb: pointer to the driver internal queue element for mailbox command.
+ *
+ * The configure MSI-X mailbox command is used to configure the HBA's SLI-3
+ * MSI-X multi-message interrupt vector association to interrupt attention
+ * conditions.
+ *
+ * Return codes
+ *    0 - Success
+ *    -EINVAL - Failure
+ **/
+int
+lpfc_config_msi(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
+{
+        MAILBOX_t *mb = &pmb->mb;
+        uint32_t attentionConditions[2];
+
+        /* Sanity check */
+        if (phba->cfg_use_msi != 2) {
+                lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
+                                "0475 Not configured for supporting MSI-X "
+                                "cfg_use_msi: 0x%x\n", phba->cfg_use_msi);
+                return -EINVAL;
+        }
+
+        if (phba->sli_rev < 3) {
+                lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
+                                "0476 HBA not supporting SLI-3 or later "
+                                "SLI Revision: 0x%x\n", phba->sli_rev);
+                return -EINVAL;
+        }
+
+        /* Clear mailbox command fields */
+        memset(pmb, 0, sizeof(LPFC_MBOXQ_t));
+
+        /*
+         * SLI-3, Message Signaled Interrupt Fearure.
+         */
+
+        /* Multi-message attention configuration */
+        attentionConditions[0] = (HA_R0ATT | HA_R1ATT | HA_R2ATT | HA_ERATT |
+                                  HA_LATT | HA_MBATT);
+        attentionConditions[1] = 0;
+
+        mb->un.varCfgMSI.attentionConditions[0] = attentionConditions[0];
+        mb->un.varCfgMSI.attentionConditions[1] = attentionConditions[1];
+
+        /*
+         * Set up message number to HA bit association
+         */
+#ifdef __BIG_ENDIAN_BITFIELD
+        /* RA0 (FCP Ring) */
+        mb->un.varCfgMSI.messageNumberByHA[HA_R0_POS] = 1;
+        /* RA1 (Other Protocol Extra Ring) */
+        mb->un.varCfgMSI.messageNumberByHA[HA_R1_POS] = 1;
+#else   /*  __LITTLE_ENDIAN_BITFIELD */
+        /* RA0 (FCP Ring) */
+        mb->un.varCfgMSI.messageNumberByHA[HA_R0_POS^3] = 1;
+        /* RA1 (Other Protocol Extra Ring) */
+        mb->un.varCfgMSI.messageNumberByHA[HA_R1_POS^3] = 1;
+#endif
+        /* Multi-message interrupt autoclear configuration*/
+        mb->un.varCfgMSI.autoClearHA[0] = attentionConditions[0];
+        mb->un.varCfgMSI.autoClearHA[1] = attentionConditions[1];
+
+        /* For now, HBA autoclear does not work reliably, disable it */
+        mb->un.varCfgMSI.autoClearHA[0] = 0;
+        mb->un.varCfgMSI.autoClearHA[1] = 0;
+
+        /* Set command and owner bit */
+        mb->mbxCommand = MBX_CONFIG_MSI;
+        mb->mbxOwner = OWN_HOST;
+
+        return 0;
+}
+
+/**
+ * lpfc_init_link: Prepare a mailbox command for initialize link on a HBA.
+ * @phba: pointer to lpfc hba data structure.
+ * @pmb: pointer to the driver internal queue element for mailbox command.
+ * @topology: the link topology for the link to be initialized to.
+ * @linkspeed: the link speed for the link to be initialized to.
+ *
+ * The initialize link mailbox command is used to initialize the Fibre
+ * Channel link. This command must follow a configure port command that
+ * establishes the mode of operation.
+ *
+ * This routine prepares the mailbox command for initializing link on a HBA
+ * with the specified link topology and speed.
+ **/
 void
 lpfc_init_link(struct lpfc_hba * phba,
                LPFC_MBOXQ_t * pmb, uint32_t topology, uint32_t linkspeed)
@@ -269,10 +430,27 @@ lpfc_init_link(struct lpfc_hba * phba,
         return;
 }
 
-/**********************************************/
-/*  lpfc_read_sparam  Issue a READ SPARAM     */
-/*                    mailbox command         */
-/**********************************************/
+/**
+ * lpfc_read_sparam: Prepare a mailbox command for reading HBA parameters.
+ * @phba: pointer to lpfc hba data structure.
+ * @pmb: pointer to the driver internal queue element for mailbox command.
+ * @vpi: virtual N_Port identifier.
+ *
+ * The read service parameter mailbox command is used to read the HBA port
+ * service parameters. The service parameters are read into the buffer
+ * specified directly by a BDE in the mailbox command. These service
+ * parameters may then be used to build the payload of an N_Port/F_POrt
+ * login request and reply (LOGI/ACC).
+ *
+ * This routine prepares the mailbox command for reading HBA port service
+ * parameters. The DMA memory is allocated in this function and the addresses
+ * are populated into the mailbox command for the HBA to DMA the service
+ * parameters into.
+ *
+ * Return codes
+ *    0 - Success
+ *    1 - DMA memory allocation failed
+ **/
 int
 lpfc_read_sparam(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb, int vpi)
 {
@@ -312,10 +490,21 @@ lpfc_read_sparam(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb, int vpi)
         return (0);
 }
 
-/********************************************/
-/*  lpfc_unreg_did  Issue a UNREG_DID       */
-/*                  mailbox command         */
-/********************************************/
+/**
+ * lpfc_unreg_did: Prepare a mailbox command for unregistering DID.
+ * @phba: pointer to lpfc hba data structure.
+ * @vpi: virtual N_Port identifier.
+ * @did: remote port identifier.
+ * @pmb: pointer to the driver internal queue element for mailbox command.
+ *
+ * The unregister DID mailbox command is used to unregister an N_Port/F_Port
+ * login for an unknown RPI by specifying the DID of a remote port. This
+ * command frees an RPI context in the HBA port. This has the effect of
+ * performing an implicit N_Port/F_Port logout.
+ *
+ * This routine prepares the mailbox command for unregistering a remote
+ * N_Port/F_Port (DID) login.
+ **/
 void
 lpfc_unreg_did(struct lpfc_hba * phba, uint16_t vpi, uint32_t did,
                LPFC_MBOXQ_t * pmb)
@@ -333,10 +522,19 @@ lpfc_unreg_did(struct lpfc_hba * phba, uint16_t vpi, uint32_t did,
         return;
 }
 
-/**********************************************/
-/*  lpfc_read_nv  Issue a READ CONFIG         */
-/*                mailbox command             */
-/**********************************************/
+/**
+ * lpfc_read_config: Prepare a mailbox command for reading HBA configuration.
+ * @phba: pointer to lpfc hba data structure.
+ * @pmb: pointer to the driver internal queue element for mailbox command.
+ *
+ * The read configuration mailbox command is used to read the HBA port
+ * configuration parameters. This mailbox command provides a method for
+ * seeing any parameters that may have changed via various configuration
+ * mailbox commands.
+ *
+ * This routine prepares the mailbox command for reading out HBA configuration
+ * parameters.
+ **/
 void
 lpfc_read_config(struct lpfc_hba * phba, LPFC_MBOXQ_t * pmb)
 {
@@ -350,10 +548,18 @@ lpfc_read_config(struct lpfc_hba * phba, LPFC_MBOXQ_t * pmb)
         return;
 }
 
-/*************************************************/
-/*  lpfc_read_lnk_stat  Issue a READ LINK STATUS */
-/*                mailbox command                */
-/*************************************************/
+/**
+ * lpfc_read_lnk_stat: Prepare a mailbox command for reading HBA link stats.
+ * @phba: pointer to lpfc hba data structure.
+ * @pmb: pointer to the driver internal queue element for mailbox command.
+ *
+ * The read link status mailbox command is used to read the link status from
+ * the HBA. Link status includes all link-related error counters. These
+ * counters are maintained by the HBA and originated in the link hardware
+ * unit. Note that all of these counters wrap.
+ *
+ * This routine prepares the mailbox command for reading out HBA link status.
+ **/
 void
 lpfc_read_lnk_stat(struct lpfc_hba * phba, LPFC_MBOXQ_t * pmb)
 {
@@ -367,10 +573,30 @@ lpfc_read_lnk_stat(struct lpfc_hba * phba, LPFC_MBOXQ_t * pmb)
         return;
 }
 
-/********************************************/
-/*  lpfc_reg_login  Issue a REG_LOGIN       */
-/*                  mailbox command         */
-/********************************************/
+/**
+ * lpfc_reg_login: Prepare a mailbox command for registering remote login.
+ * @phba: pointer to lpfc hba data structure.
+ * @vpi: virtual N_Port identifier.
+ * @did: remote port identifier.
+ * @param: pointer to memory holding the server parameters.
+ * @pmb: pointer to the driver internal queue element for mailbox command.
+ * @flag: action flag to be passed back for the complete function.
+ *
+ * The registration login mailbox command is used to register an N_Port or
+ * F_Port login. This registration allows the HBA to cache the remote N_Port
+ * service parameters internally and thereby make the appropriate FC-2
+ * decisions. The remote port service parameters are handed off by the driver
+ * to the HBA using a descriptor entry that directly identifies a buffer in
+ * host memory. In exchange, the HBA returns an RPI identifier.
+ *
+ * This routine prepares the mailbox command for registering remote port login.
+ * The function allocates DMA buffer for passing the service parameters to the
+ * HBA with the mailbox command.
+ *
+ * Return codes
+ *    0 - Success
+ *    1 - DMA memory allocation failed
+ **/
 int
 lpfc_reg_login(struct lpfc_hba *phba, uint16_t vpi, uint32_t did,
                uint8_t *param, LPFC_MBOXQ_t *pmb, uint32_t flag)
@@ -418,10 +644,20 @@ lpfc_reg_login(struct lpfc_hba *phba, uint16_t vpi, uint32_t did,
         return (0);
 }
 
-/**********************************************/
-/*  lpfc_unreg_login  Issue a UNREG_LOGIN     */
-/*                    mailbox command         */
-/**********************************************/
+/**
+ * lpfc_unreg_login: Prepare a mailbox command for unregistering remote login.
+ * @phba: pointer to lpfc hba data structure.
+ * @vpi: virtual N_Port identifier.
+ * @rpi: remote port identifier
+ * @pmb: pointer to the driver internal queue element for mailbox command.
+ *
+ * The unregistration login mailbox command is used to unregister an N_Port
+ * or F_Port login. This command frees an RPI context in the HBA. It has the
+ * effect of performing an implicit N_Port/F_Port logout.
+ *
+ * This routine prepares the mailbox command for unregistering remote port
+ * login.
+ **/
 void
 lpfc_unreg_login(struct lpfc_hba *phba, uint16_t vpi, uint32_t rpi,
                  LPFC_MBOXQ_t * pmb)
@@ -440,10 +676,21 @@ lpfc_unreg_login(struct lpfc_hba *phba, uint16_t vpi, uint32_t rpi,
         return;
 }
 
-/**************************************************/
-/*  lpfc_reg_vpi   Issue a REG_VPI                */
-/*                    mailbox command             */
-/**************************************************/
+/**
+ * lpfc_reg_vpi: Prepare a mailbox command for registering vport identifier.
+ * @phba: pointer to lpfc hba data structure.
+ * @vpi: virtual N_Port identifier.
+ * @sid: Fibre Channel S_ID (N_Port_ID assigned to a virtual N_Port).
+ * @pmb: pointer to the driver internal queue element for mailbox command.
+ *
+ * The registration vport identifier mailbox command is used to activate a
+ * virtual N_Port after it has acquired an N_Port_ID. The HBA validates the
+ * N_Port_ID against the information in the selected virtual N_Port context
+ * block and marks it active to allow normal processing of IOCB commands and
+ * received unsolicited exchanges.
+ *
+ * This routine prepares the mailbox command for registering a virtual N_Port.
+ **/
 void
 lpfc_reg_vpi(struct lpfc_hba *phba, uint16_t vpi, uint32_t sid,
              LPFC_MBOXQ_t *pmb)
@@ -461,10 +708,22 @@ lpfc_reg_vpi(struct lpfc_hba *phba, uint16_t vpi, uint32_t sid,
 
 }
 
-/**************************************************/
-/*  lpfc_unreg_vpi   Issue a UNREG_VNPI           */
-/*                    mailbox command             */
-/**************************************************/
+/**
+ * lpfc_unreg_vpi: Prepare a mailbox command for unregistering vport id.
+ * @phba: pointer to lpfc hba data structure.
+ * @vpi: virtual N_Port identifier.
+ * @pmb: pointer to the driver internal queue element for mailbox command.
+ *
+ * The unregistration vport identifier mailbox command is used to inactivate
+ * a virtual N_Port. The driver must have logged out and unregistered all
+ * remote N_Ports to abort any activity on the virtual N_Port. The HBA will
+ * unregisters any default RPIs associated with the specified vpi, aborting
+ * any active exchanges. The HBA will post the mailbox response after making
+ * the virtual N_Port inactive.
+ *
+ * This routine prepares the mailbox command for unregistering a virtual
+ * N_Port.
+ **/
 void
 lpfc_unreg_vpi(struct lpfc_hba *phba, uint16_t vpi, LPFC_MBOXQ_t *pmb)
 {
@@ -479,12 +738,19 @@ lpfc_unreg_vpi(struct lpfc_hba *phba, uint16_t vpi, LPFC_MBOXQ_t *pmb)
 
 }
 
+/**
+ * lpfc_config_pcb_setup: Set up IOCB rings in the Port Control Block (PCB)
+ * @phba: pointer to lpfc hba data structure.
+ *
+ * This routine sets up and initializes the IOCB rings in the Port Control
+ * Block (PCB).
+ **/
 static void
 lpfc_config_pcb_setup(struct lpfc_hba * phba)
 {
         struct lpfc_sli *psli = &phba->sli;
         struct lpfc_sli_ring *pring;
-        PCB_t *pcbp = &phba->slim2p->pcb;
+        PCB_t *pcbp = phba->pcb;
         dma_addr_t pdma_addr;
         uint32_t offset;
         uint32_t iocbCnt = 0;
@@ -513,29 +779,43 @@ lpfc_config_pcb_setup(struct lpfc_hba * phba)
                         continue;
                 }
                 /* Command ring setup for ring */
-                pring->cmdringaddr = (void *) &phba->slim2p->IOCBs[iocbCnt];
+                pring->cmdringaddr = (void *)&phba->IOCBs[iocbCnt];
                 pcbp->rdsc[i].cmdEntries = pring->numCiocb;
 
-                offset = (uint8_t *) &phba->slim2p->IOCBs[iocbCnt] -
-                         (uint8_t *) phba->slim2p;
-                pdma_addr = phba->slim2p_mapping + offset;
+                offset = (uint8_t *) &phba->IOCBs[iocbCnt] -
+                         (uint8_t *) phba->slim2p.virt;
+                pdma_addr = phba->slim2p.phys + offset;
                 pcbp->rdsc[i].cmdAddrHigh = putPaddrHigh(pdma_addr);
                 pcbp->rdsc[i].cmdAddrLow = putPaddrLow(pdma_addr);
                 iocbCnt += pring->numCiocb;
 
                 /* Response ring setup for ring */
-                pring->rspringaddr = (void *) &phba->slim2p->IOCBs[iocbCnt];
+                pring->rspringaddr = (void *) &phba->IOCBs[iocbCnt];
 
                 pcbp->rdsc[i].rspEntries = pring->numRiocb;
-                offset = (uint8_t *)&phba->slim2p->IOCBs[iocbCnt] -
-                         (uint8_t *)phba->slim2p;
-                pdma_addr = phba->slim2p_mapping + offset;
+                offset = (uint8_t *)&phba->IOCBs[iocbCnt] -
+                         (uint8_t *)phba->slim2p.virt;
+                pdma_addr = phba->slim2p.phys + offset;
                 pcbp->rdsc[i].rspAddrHigh = putPaddrHigh(pdma_addr);
                 pcbp->rdsc[i].rspAddrLow = putPaddrLow(pdma_addr);
                 iocbCnt += pring->numRiocb;
         }
 }
 
+/**
+ * lpfc_read_rev: Prepare a mailbox command for reading HBA revision.
+ * @phba: pointer to lpfc hba data structure.
+ * @pmb: pointer to the driver internal queue element for mailbox command.
+ *
+ * The read revision mailbox command is used to read the revision levels of
+ * the HBA components. These components include hardware units, resident
+ * firmware, and available firmware. HBAs that supports SLI-3 mode of
+ * operation provide different response information depending on the version
+ * requested by the driver.
+ *
+ * This routine prepares the mailbox command for reading HBA revision
+ * information.
+ **/
 void
 lpfc_read_rev(struct lpfc_hba * phba, LPFC_MBOXQ_t * pmb)
 {
@@ -548,6 +828,16 @@ lpfc_read_rev(struct lpfc_hba * phba, LPFC_MBOXQ_t * pmb)
         return;
 }
 
+/**
+ * lpfc_build_hbq_profile2: Set up the HBQ Selection Profile 2.
+ * @hbqmb: pointer to the HBQ configuration data structure in mailbox command.
+ * @hbq_desc: pointer to the HBQ selection profile descriptor.
+ *
+ * The Host Buffer Queue (HBQ) Selection Profile 2 specifies that the HBA
+ * tests the incoming frames' R_CTL/TYPE fields with works 10:15 and performs
+ * the Sequence Length Test using the fields in the Selection Profile 2
+ * extension in words 20:31.
+ **/
 static void
 lpfc_build_hbq_profile2(struct config_hbq_var *hbqmb,
                         struct lpfc_hbq_init  *hbq_desc)
@@ -557,6 +847,16 @@ lpfc_build_hbq_profile2(struct config_hbq_var *hbqmb,
         hbqmb->profiles.profile2.seqlenoff  = hbq_desc->seqlenoff;
 }
 
+/**
+ * lpfc_build_hbq_profile3: Set up the HBQ Selection Profile 3.
+ * @hbqmb: pointer to the HBQ configuration data structure in mailbox command.
+ * @hbq_desc: pointer to the HBQ selection profile descriptor.
+ *
+ * The Host Buffer Queue (HBQ) Selection Profile 3 specifies that the HBA
+ * tests the incoming frame's R_CTL/TYPE fields with words 10:15 and performs
+ * the Sequence Length Test and Byte Field Test using the fields in the
+ * Selection Profile 3 extension in words 20:31.
+ **/
 static void
 lpfc_build_hbq_profile3(struct config_hbq_var *hbqmb,
                         struct lpfc_hbq_init  *hbq_desc)
@@ -569,6 +869,17 @@ lpfc_build_hbq_profile3(struct config_hbq_var *hbqmb,
                sizeof(hbqmb->profiles.profile3.cmdmatch));
 }
 
+/**
+ * lpfc_build_hbq_profile5: Set up the HBQ Selection Profile 5.
+ * @hbqmb: pointer to the HBQ configuration data structure in mailbox command.
+ * @hbq_desc: pointer to the HBQ selection profile descriptor.
+ *
+ * The Host Buffer Queue (HBQ) Selection Profile 5 specifies a header HBQ. The
+ * HBA tests the initial frame of an incoming sequence using the frame's
+ * R_CTL/TYPE fields with words 10:15 and performs the Sequence Length Test
+ * and Byte Field Test using the fields in the Selection Profile 5 extension
+ * words 20:31.
+ **/
 static void
 lpfc_build_hbq_profile5(struct config_hbq_var *hbqmb,
                         struct lpfc_hbq_init  *hbq_desc)
@@ -581,6 +892,20 @@ lpfc_build_hbq_profile5(struct config_hbq_var *hbqmb,
                sizeof(hbqmb->profiles.profile5.cmdmatch));
 }
 
+/**
+ * lpfc_config_hbq: Prepare a mailbox command for configuring an HBQ.
+ * @phba: pointer to lpfc hba data structure.
+ * @id: HBQ identifier.
+ * @hbq_desc: pointer to the HBA descriptor data structure.
+ * @hbq_entry_index: index of the HBQ entry data structures.
+ * @pmb: pointer to the driver internal queue element for mailbox command.
+ *
+ * The configure HBQ (Host Buffer Queue) mailbox command is used to configure
+ * an HBQ. The configuration binds events that require buffers to a particular
+ * ring and HBQ based on a selection profile.
+ *
+ * This routine prepares the mailbox command for configuring an HBQ.
+ **/
 void
 lpfc_config_hbq(struct lpfc_hba *phba, uint32_t id,
                  struct lpfc_hbq_init *hbq_desc,
@@ -641,8 +966,23 @@ lpfc_config_hbq(struct lpfc_hba *phba, uint32_t id,
         return;
 }
 
-
-
+/**
+ * lpfc_config_ring: Prepare a mailbox command for configuring an IOCB ring.
+ * @phba: pointer to lpfc hba data structure.
+ * @ring:
+ * @pmb: pointer to the driver internal queue element for mailbox command.
+ *
+ * The configure ring mailbox command is used to configure an IOCB ring. This
+ * configuration binds from one to six of HBA RC_CTL/TYPE mask entries to the
+ * ring. This is used to map incoming sequences to a particular ring whose
+ * RC_CTL/TYPE mask entry matches that of the sequence. The driver should not
+ * attempt to configure a ring whose number is greater than the number
+ * specified in the Port Control Block (PCB). It is an error to issue the
+ * configure ring command more than once with the same ring number. The HBA
+ * returns an error if the driver attempts this.
+ *
+ * This routine prepares the mailbox command for configuring IOCB ring.
+ **/
 void
 lpfc_config_ring(struct lpfc_hba * phba, int ring, LPFC_MBOXQ_t * pmb)
 {
@@ -684,6 +1024,20 @@ lpfc_config_ring(struct lpfc_hba * phba, int ring, LPFC_MBOXQ_t * pmb)
         return;
 }
 
+/**
+ * lpfc_config_port: Prepare a mailbox command for configuring port.
+ * @phba: pointer to lpfc hba data structure.
+ * @pmb: pointer to the driver internal queue element for mailbox command.
+ *
+ * The configure port mailbox command is used to identify the Port Control
+ * Block (PCB) in the driver memory. After this command is issued, the
+ * driver must not access the mailbox in the HBA without first resetting
+ * the HBA. The HBA may copy the PCB information to internal storage for
+ * subsequent use; the driver can not change the PCB information unless it
+ * resets the HBA.
+ *
+ * This routine prepares the mailbox command for configuring port.
+ **/
 void
 lpfc_config_port(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
 {
@@ -702,8 +1056,8 @@ lpfc_config_port(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
 
         mb->un.varCfgPort.pcbLen = sizeof(PCB_t);
 
-        offset = (uint8_t *)&phba->slim2p->pcb - (uint8_t *)phba->slim2p;
-        pdma_addr = phba->slim2p_mapping + offset;
+        offset = (uint8_t *)phba->pcb - (uint8_t *)phba->slim2p.virt;
+        pdma_addr = phba->slim2p.phys + offset;
         mb->un.varCfgPort.pcbLow = putPaddrLow(pdma_addr);
         mb->un.varCfgPort.pcbHigh = putPaddrHigh(pdma_addr);
 
@@ -711,12 +1065,13 @@ lpfc_config_port(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
 
         if (phba->sli_rev == 3 && phba->vpd.sli3Feat.cerbm) {
                 mb->un.varCfgPort.cerbm = 1; /* Request HBQs */
+                mb->un.varCfgPort.ccrp = 1; /* Command Ring Polling */
+                mb->un.varCfgPort.cinb = 1; /* Interrupt Notification Block */
                 mb->un.varCfgPort.max_hbq = lpfc_sli_hbq_count();
                 if (phba->max_vpi && phba->cfg_enable_npiv &&
                     phba->vpd.sli3Feat.cmv) {
                         mb->un.varCfgPort.max_vpi = phba->max_vpi;
                         mb->un.varCfgPort.cmv = 1;
-                        phba->sli3_options |= LPFC_SLI3_NPIV_ENABLED;
                 } else
                         mb->un.varCfgPort.max_vpi = phba->max_vpi = 0;
         } else
@@ -724,16 +1079,15 @@ lpfc_config_port(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
         mb->un.varCfgPort.sli_mode = phba->sli_rev;
 
         /* Now setup pcb */
-        phba->slim2p->pcb.type = TYPE_NATIVE_SLI2;
-        phba->slim2p->pcb.feature = FEATURE_INITIAL_SLI2;
+        phba->pcb->type = TYPE_NATIVE_SLI2;
+        phba->pcb->feature = FEATURE_INITIAL_SLI2;
 
         /* Setup Mailbox pointers */
-        phba->slim2p->pcb.mailBoxSize = offsetof(MAILBOX_t, us) +
-                sizeof(struct sli2_desc);
-        offset = (uint8_t *)&phba->slim2p->mbx - (uint8_t *)phba->slim2p;
-        pdma_addr = phba->slim2p_mapping + offset;
-        phba->slim2p->pcb.mbAddrHigh = putPaddrHigh(pdma_addr);
-        phba->slim2p->pcb.mbAddrLow = putPaddrLow(pdma_addr);
+        phba->pcb->mailBoxSize = sizeof(MAILBOX_t);
+        offset = (uint8_t *)phba->mbox - (uint8_t *)phba->slim2p.virt;
+        pdma_addr = phba->slim2p.phys + offset;
+        phba->pcb->mbAddrHigh = putPaddrHigh(pdma_addr);
+        phba->pcb->mbAddrLow = putPaddrLow(pdma_addr);
 
         /*
          * Setup Host Group ring pointer.
@@ -794,13 +1148,13 @@ lpfc_config_port(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
         }
 
         /* mask off BAR0's flag bits 0 - 3 */
-        phba->slim2p->pcb.hgpAddrLow = (bar_low & PCI_BASE_ADDRESS_MEM_MASK) +
-                (void __iomem *) phba->host_gp -
+        phba->pcb->hgpAddrLow = (bar_low & PCI_BASE_ADDRESS_MEM_MASK) +
+                (void __iomem *)phba->host_gp -
                 (void __iomem *)phba->MBslimaddr;
         if (bar_low & PCI_BASE_ADDRESS_MEM_TYPE_64)
-                phba->slim2p->pcb.hgpAddrHigh = bar_high;
+                phba->pcb->hgpAddrHigh = bar_high;
         else
-                phba->slim2p->pcb.hgpAddrHigh = 0;
+                phba->pcb->hgpAddrHigh = 0;
         /* write HGP data to SLIM at the required longword offset */
         memset(&hgp, 0, sizeof(struct lpfc_hgp));
 
@@ -810,17 +1164,19 @@ lpfc_config_port(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
         }
 
         /* Setup Port Group ring pointer */
-        if (phba->sli_rev == 3)
-                pgp_offset = (uint8_t *)&phba->slim2p->mbx.us.s3_pgp.port -
-                        (uint8_t *)phba->slim2p;
-        else
-                pgp_offset = (uint8_t *)&phba->slim2p->mbx.us.s2.port -
-                        (uint8_t *)phba->slim2p;
-
-        pdma_addr = phba->slim2p_mapping + pgp_offset;
-        phba->slim2p->pcb.pgpAddrHigh = putPaddrHigh(pdma_addr);
-        phba->slim2p->pcb.pgpAddrLow = putPaddrLow(pdma_addr);
-        phba->hbq_get = &phba->slim2p->mbx.us.s3_pgp.hbq_get[0];
+        if (phba->sli3_options & LPFC_SLI3_INB_ENABLED) {
+                pgp_offset = offsetof(struct lpfc_sli2_slim,
+                                      mbx.us.s3_inb_pgp.port);
+                phba->hbq_get = phba->mbox->us.s3_inb_pgp.hbq_get;
+        } else if (phba->sli_rev == 3) {
+                pgp_offset = offsetof(struct lpfc_sli2_slim,
+                                      mbx.us.s3_pgp.port);
+                phba->hbq_get = phba->mbox->us.s3_pgp.hbq_get;
+        } else
+                pgp_offset = offsetof(struct lpfc_sli2_slim, mbx.us.s2.port);
+        pdma_addr = phba->slim2p.phys + pgp_offset;
+        phba->pcb->pgpAddrHigh = putPaddrHigh(pdma_addr);
+        phba->pcb->pgpAddrLow = putPaddrLow(pdma_addr);
 
         /* Use callback routine to setp rings in the pcb */
         lpfc_config_pcb_setup(phba);
@@ -835,10 +1191,24 @@ lpfc_config_port(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
         }
 
         /* Swap PCB if needed */
-        lpfc_sli_pcimem_bcopy(&phba->slim2p->pcb, &phba->slim2p->pcb,
-                              sizeof(PCB_t));
+        lpfc_sli_pcimem_bcopy(phba->pcb, phba->pcb, sizeof(PCB_t));
 }
 
+/**
+ * lpfc_kill_board: Prepare a mailbox command for killing board.
+ * @phba: pointer to lpfc hba data structure.
+ * @pmb: pointer to the driver internal queue element for mailbox command.
+ *
+ * The kill board mailbox command is used to tell firmware to perform a
+ * graceful shutdown of a channel on a specified board to prepare for reset.
+ * When the kill board mailbox command is received, the ER3 bit is set to 1
+ * in the Host Status register and the ER Attention bit is set to 1 in the
+ * Host Attention register of the HBA function that received the kill board
+ * command.
+ *
+ * This routine prepares the mailbox command for killing the board in
+ * preparation for a graceful shutdown.
+ **/
 void
 lpfc_kill_board(struct lpfc_hba * phba, LPFC_MBOXQ_t * pmb)
 {
@@ -850,6 +1220,16 @@ lpfc_kill_board(struct lpfc_hba * phba, LPFC_MBOXQ_t * pmb)
         return;
 }
 
+/**
+ * lpfc_mbox_put: Put a mailbox cmd into the tail of driver's mailbox queue.
+ * @phba: pointer to lpfc hba data structure.
+ * @mbq: pointer to the driver internal queue element for mailbox command.
+ *
+ * Driver maintains a internal mailbox command queue implemented as a linked
+ * list. When a mailbox command is issued, it shall be put into the mailbox
+ * command queue such that they shall be processed orderly as HBA can process
+ * one mailbox command at a time.
+ **/
 void
 lpfc_mbox_put(struct lpfc_hba * phba, LPFC_MBOXQ_t * mbq)
 {
@@ -864,6 +1244,20 @@ lpfc_mbox_put(struct lpfc_hba * phba, LPFC_MBOXQ_t * mbq)
         return;
 }
 
+/**
+ * lpfc_mbox_get: Remove a mailbox cmd from the head of driver's mailbox queue.
+ * @phba: pointer to lpfc hba data structure.
+ *
+ * Driver maintains a internal mailbox command queue implemented as a linked
+ * list. When a mailbox command is issued, it shall be put into the mailbox
+ * command queue such that they shall be processed orderly as HBA can process
+ * one mailbox command at a time. After HBA finished processing a mailbox
+ * command, the driver will remove a pending mailbox command from the head of
+ * the mailbox command queue and send to the HBA for processing.
+ *
+ * Return codes
+ *    pointer to the driver internal queue element for mailbox command.
+ **/
 LPFC_MBOXQ_t *
 lpfc_mbox_get(struct lpfc_hba * phba)
 {
@@ -877,6 +1271,17 @@ lpfc_mbox_get(struct lpfc_hba * phba)
         return mbq;
 }
 
+/**
+ * lpfc_mbox_cmpl_put: Put mailbox command into mailbox command complete list.
+ * @phba: pointer to lpfc hba data structure.
+ * @mbq: pointer to the driver internal queue element for mailbox command.
+ *
+ * This routine put the completed mailbox command into the mailbox command
+ * complete list. This routine is called from driver interrupt handler
+ * context.The mailbox complete list is used by the driver worker thread
+ * to process mailbox complete callback functions outside the driver interrupt
+ * handler.
+ **/
 void
 lpfc_mbox_cmpl_put(struct lpfc_hba * phba, LPFC_MBOXQ_t * mbq)
 {
@@ -887,6 +1292,17 @@ lpfc_mbox_cmpl_put(struct lpfc_hba * phba, LPFC_MBOXQ_t * mbq)
         return;
 }
 
+/**
+ * lpfc_mbox_tmo_val: Retrieve mailbox command timeout value.
+ * @phba: pointer to lpfc hba data structure.
+ * @cmd: mailbox command code.
+ *
+ * This routine retrieves the proper timeout value according to the mailbox
+ * command code.
+ *
+ * Return codes
+ *    Timeout value to be used for the given mailbox command
+ **/
 int
 lpfc_mbox_tmo_val(struct lpfc_hba *phba, int cmd)
 {
diff --git a/drivers/scsi/lpfc/lpfc_mem.c b/drivers/scsi/lpfc/lpfc_mem.c
index 3c0cebc71800..a4bba2069248 100644
--- a/drivers/scsi/lpfc/lpfc_mem.c
+++ b/drivers/scsi/lpfc/lpfc_mem.c
@@ -1,7 +1,7 @@
 /*******************************************************************
  * This file is part of the Emulex Linux Device Driver for         *
  * Fibre Channel Host Bus Adapters.                                *
- * Copyright (C) 2004-2006 Emulex.  All rights reserved.           *
+ * Copyright (C) 2004-2008 Emulex.  All rights reserved.           *
  * EMULEX and SLI are trademarks of Emulex.                        *
  * www.emulex.com                                                  *
  * Portions Copyright (C) 2004-2005 Christoph Hellwig              *
@@ -30,6 +30,7 @@
 
 #include "lpfc_hw.h"
 #include "lpfc_sli.h"
+#include "lpfc_nl.h"
 #include "lpfc_disc.h"
 #include "lpfc_scsi.h"
 #include "lpfc.h"
@@ -39,7 +40,21 @@
 #define LPFC_MEM_POOL_SIZE      64      /* max elem in non-DMA safety pool */
 
 
-
+/**
+ * lpfc_mem_alloc: create and allocate all PCI and memory pools
+ * @phba: HBA to allocate pools for
+ *
+ * Description: Creates and allocates PCI pools lpfc_scsi_dma_buf_pool,
+ * lpfc_mbuf_pool, lpfc_hbq_pool.  Creates and allocates kmalloc-backed mempools
+ * for LPFC_MBOXQ_t and lpfc_nodelist.  Also allocates the VPI bitmask.
+ *
+ * Notes: Not interrupt-safe.  Must be called with no locks held.  If any
+ * allocation fails, frees all successfully allocated memory before returning.
+ *
+ * Returns:
+ *   0 on success
+ *   -ENOMEM on failure (if any memory allocations fail)
+ **/
 int
 lpfc_mem_alloc(struct lpfc_hba * phba)
 {
@@ -120,6 +135,16 @@ lpfc_mem_alloc(struct lpfc_hba * phba)
         return -ENOMEM;
 }
 
+/**
+ * lpfc_mem_free: Frees all PCI and memory allocated by lpfc_mem_alloc
+ * @phba: HBA to free memory for
+ *
+ * Description: Frees PCI pools lpfc_scsi_dma_buf_pool, lpfc_mbuf_pool,
+ * lpfc_hbq_pool.  Frees kmalloc-backed mempools for LPFC_MBOXQ_t and
+ * lpfc_nodelist.  Also frees the VPI bitmask.
+ *
+ * Returns: None
+ **/
 void
 lpfc_mem_free(struct lpfc_hba * phba)
 {
@@ -181,12 +206,29 @@ lpfc_mem_free(struct lpfc_hba * phba)
         phba->lpfc_scsi_dma_buf_pool = NULL;
         phba->lpfc_mbuf_pool = NULL;
 
-                                /* Free the iocb lookup array */
+        /* Free the iocb lookup array */
         kfree(psli->iocbq_lookup);
         psli->iocbq_lookup = NULL;
-
 }
 
+/**
+ * lpfc_mbuf_alloc: Allocate an mbuf from the lpfc_mbuf_pool PCI pool
+ * @phba: HBA which owns the pool to allocate from
+ * @mem_flags: indicates if this is a priority (MEM_PRI) allocation
+ * @handle: used to return the DMA-mapped address of the mbuf
+ *
+ * Description: Allocates a DMA-mapped buffer from the lpfc_mbuf_pool PCI pool.
+ * Allocates from generic pci_pool_alloc function first and if that fails and
+ * mem_flags has MEM_PRI set (the only defined flag), returns an mbuf from the
+ * HBA's pool.
+ *
+ * Notes: Not interrupt-safe.  Must be called with no locks held.  Takes
+ * phba->hbalock.
+ *
+ * Returns:
+ *   pointer to the allocated mbuf on success
+ *   NULL on failure
+ **/
 void *
 lpfc_mbuf_alloc(struct lpfc_hba *phba, int mem_flags, dma_addr_t *handle)
 {
@@ -206,6 +248,20 @@ lpfc_mbuf_alloc(struct lpfc_hba *phba, int mem_flags, dma_addr_t *handle)
         return ret;
 }
 
+/**
+ * __lpfc_mem_free: Free an mbuf from the lpfc_mbuf_pool PCI pool (locked)
+ * @phba: HBA which owns the pool to return to
+ * @virt: mbuf to free
+ * @dma: the DMA-mapped address of the lpfc_mbuf_pool to be freed
+ *
+ * Description: Returns an mbuf lpfc_mbuf_pool to the lpfc_mbuf_safety_pool if
+ * it is below its max_count, frees the mbuf otherwise.
+ *
+ * Notes: Must be called with phba->hbalock held to synchronize access to
+ * lpfc_mbuf_safety_pool.
+ *
+ * Returns: None
+ **/
 void
 __lpfc_mbuf_free(struct lpfc_hba * phba, void *virt, dma_addr_t dma)
 {
@@ -221,7 +277,21 @@ __lpfc_mbuf_free(struct lpfc_hba * phba, void *virt, dma_addr_t dma)
         return;
 }
 
+/**
+ * lpfc_mem_free: Free an mbuf from the lpfc_mbuf_pool PCI pool (unlocked)
+ * @phba: HBA which owns the pool to return to
+ * @virt: mbuf to free
+ * @dma: the DMA-mapped address of the lpfc_mbuf_pool to be freed
+ *
+ * Description: Returns an mbuf lpfc_mbuf_pool to the lpfc_mbuf_safety_pool if
+ * it is below its max_count, frees the mbuf otherwise.
+ *
+ * Notes: Takes phba->hbalock.  Can be called with or without other locks held.
+ *
+ * Returns: None
+ **/
 void
+
 lpfc_mbuf_free(struct lpfc_hba * phba, void *virt, dma_addr_t dma)
 {
         unsigned long iflags;
@@ -232,6 +302,19 @@ lpfc_mbuf_free(struct lpfc_hba * phba, void *virt, dma_addr_t dma)
         return;
 }
 
+/**
+ * lpfc_els_hbq_alloc: Allocate an HBQ buffer
+ * @phba: HBA to allocate HBQ buffer for
+ *
+ * Description: Allocates a DMA-mapped HBQ buffer from the lpfc_hbq_pool PCI
+ * pool along a non-DMA-mapped container for it.
+ *
+ * Notes: Not interrupt-safe.  Must be called with no locks held.
+ *
+ * Returns:
+ *   pointer to HBQ on success
+ *   NULL on failure
+ **/
 struct hbq_dmabuf *
 lpfc_els_hbq_alloc(struct lpfc_hba *phba)
 {
@@ -251,6 +334,18 @@ lpfc_els_hbq_alloc(struct lpfc_hba *phba)
         return hbqbp;
 }
 
+/**
+ * lpfc_mem_hbq_free: Frees an HBQ buffer allocated with lpfc_els_hbq_alloc
+ * @phba: HBA buffer was allocated for
+ * @hbqbp: HBQ container returned by lpfc_els_hbq_alloc
+ *
+ * Description: Frees both the container and the DMA-mapped buffer returned by
+ * lpfc_els_hbq_alloc.
+ *
+ * Notes: Can be called with or without locks held.
+ *
+ * Returns: None
+ **/
 void
 lpfc_els_hbq_free(struct lpfc_hba *phba, struct hbq_dmabuf *hbqbp)
 {
@@ -259,7 +354,18 @@ lpfc_els_hbq_free(struct lpfc_hba *phba, struct hbq_dmabuf *hbqbp)
         return;
 }
 
-/* This is ONLY called for the LPFC_ELS_HBQ */
+/**
+ * lpfc_in_buf_free: Free a DMA buffer
+ * @phba: HBA buffer is associated with
+ * @mp: Buffer to free
+ *
+ * Description: Frees the given DMA buffer in the appropriate way given if the
+ * HBA is running in SLI3 mode with HBQs enabled.
+ *
+ * Notes: Takes phba->hbalock.  Can be called with or without other locks held.
+ *
+ * Returns: None
+ **/
 void
 lpfc_in_buf_free(struct lpfc_hba *phba, struct lpfc_dmabuf *mp)
 {
diff --git a/drivers/scsi/lpfc/lpfc_nl.h b/drivers/scsi/lpfc/lpfc_nl.h
new file mode 100644
index 000000000000..1accb5a9f4e6
--- /dev/null
+++ b/drivers/scsi/lpfc/lpfc_nl.h
@@ -0,0 +1,163 @@
+/*******************************************************************
+ * This file is part of the Emulex Linux Device Driver for         *
+ * Fibre Channel Host Bus Adapters.                                *
+ * Copyright (C) 2008 Emulex.  All rights reserved.                *
+ * EMULEX and SLI are trademarks of Emulex.                        *
+ * www.emulex.com                                                  *
+ *                                                                 *
+ * This program is free software; you can redistribute it and/or   *
+ * modify it under the terms of version 2 of the GNU General       *
+ * Public License as published by the Free Software Foundation.    *
+ * This program is distributed in the hope that it will be useful. *
+ * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND          *
+ * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,  *
+ * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE      *
+ * DISCLAIMED, EXCEPT TO THE EXTENT THAT SUCH DISCLAIMERS ARE HELD *
+ * TO BE LEGALLY INVALID.  See the GNU General Public License for  *
+ * more details, a copy of which can be found in the file COPYING  *
+ * included with this package.                                     *
+ *******************************************************************/
+
+/* Event definitions for RegisterForEvent */
+#define FC_REG_LINK_EVENT               0x0001  /* link up / down events */
+#define FC_REG_RSCN_EVENT               0x0002  /* RSCN events */
+#define FC_REG_CT_EVENT                 0x0004  /* CT request events */
+#define FC_REG_DUMP_EVENT               0x0008  /* Dump events */
+#define FC_REG_TEMPERATURE_EVENT        0x0010  /* temperature events */
+#define FC_REG_ELS_EVENT                0x0020  /* lpfc els events */
+#define FC_REG_FABRIC_EVENT             0x0040  /* lpfc fabric events */
+#define FC_REG_SCSI_EVENT               0x0080  /* lpfc scsi events */
+#define FC_REG_BOARD_EVENT              0x0100  /* lpfc board events */
+#define FC_REG_ADAPTER_EVENT            0x0200  /* lpfc adapter events */
+#define FC_REG_EVENT_MASK               (FC_REG_LINK_EVENT | \
+                                                FC_REG_RSCN_EVENT | \
+                                                FC_REG_CT_EVENT | \
+                                                FC_REG_DUMP_EVENT | \
+                                                FC_REG_TEMPERATURE_EVENT | \
+                                                FC_REG_ELS_EVENT | \
+                                                FC_REG_FABRIC_EVENT | \
+                                                FC_REG_SCSI_EVENT | \
+                                                FC_REG_BOARD_EVENT | \
+                                                FC_REG_ADAPTER_EVENT)
+/* Temperature events */
+#define LPFC_CRIT_TEMP          0x1
+#define LPFC_THRESHOLD_TEMP     0x2
+#define LPFC_NORMAL_TEMP        0x3
+/*
+ * All net link event payloads will begin with and event type
+ * and subcategory. The event type must come first.
+ * The subcategory further defines the data that follows in the rest
+ * of the payload. Each category will have its own unique header plus
+ * any addtional data unique to the subcategory.
+ * The payload sent via the fc transport is one-way driver->application.
+ */
+
+/* els event header */
+struct lpfc_els_event_header {
+        uint32_t event_type;
+        uint32_t subcategory;
+        uint8_t wwpn[8];
+        uint8_t wwnn[8];
+};
+
+/* subcategory codes for FC_REG_ELS_EVENT */
+#define LPFC_EVENT_PLOGI_RCV            0x01
+#define LPFC_EVENT_PRLO_RCV             0x02
+#define LPFC_EVENT_ADISC_RCV            0x04
+#define LPFC_EVENT_LSRJT_RCV            0x08
+
+/* special els lsrjt event */
+struct lpfc_lsrjt_event {
+        struct lpfc_els_event_header header;
+        uint32_t command;
+        uint32_t reason_code;
+        uint32_t explanation;
+};
+
+
+/* fabric event header */
+struct lpfc_fabric_event_header {
+        uint32_t event_type;
+        uint32_t subcategory;
+        uint8_t wwpn[8];
+        uint8_t wwnn[8];
+};
+
+/* subcategory codes for FC_REG_FABRIC_EVENT */
+#define LPFC_EVENT_FABRIC_BUSY          0x01
+#define LPFC_EVENT_PORT_BUSY            0x02
+#define LPFC_EVENT_FCPRDCHKERR          0x04
+
+/* special case fabric fcprdchkerr event */
+struct lpfc_fcprdchkerr_event {
+        struct lpfc_fabric_event_header header;
+        uint32_t lun;
+        uint32_t opcode;
+        uint32_t fcpiparam;
+};
+
+
+/* scsi event header */
+struct lpfc_scsi_event_header {
+        uint32_t event_type;
+        uint32_t subcategory;
+        uint32_t lun;
+        uint8_t wwpn[8];
+        uint8_t wwnn[8];
+};
+
+/* subcategory codes for FC_REG_SCSI_EVENT */
+#define LPFC_EVENT_QFULL        0x0001
+#define LPFC_EVENT_DEVBSY       0x0002
+#define LPFC_EVENT_CHECK_COND   0x0004
+#define LPFC_EVENT_LUNRESET     0x0008
+#define LPFC_EVENT_TGTRESET     0x0010
+#define LPFC_EVENT_BUSRESET     0x0020
+#define LPFC_EVENT_VARQUEDEPTH  0x0040
+
+/* special case scsi varqueuedepth event */
+struct lpfc_scsi_varqueuedepth_event {
+        struct lpfc_scsi_event_header scsi_event;
+        uint32_t oldval;
+        uint32_t newval;
+};
+
+/* special case scsi check condition event */
+struct lpfc_scsi_check_condition_event {
+        struct lpfc_scsi_event_header scsi_event;
+        uint8_t sense_key;
+        uint8_t asc;
+        uint8_t ascq;
+};
+
+/* event codes for FC_REG_BOARD_EVENT */
+#define LPFC_EVENT_PORTINTERR           0x01
+
+/* board event header */
+struct lpfc_board_event_header {
+        uint32_t event_type;
+        uint32_t subcategory;
+};
+
+
+/* event codes for FC_REG_ADAPTER_EVENT */
+#define LPFC_EVENT_ARRIVAL      0x01
+
+/* adapter event header */
+struct lpfc_adapter_event_header {
+        uint32_t event_type;
+        uint32_t subcategory;
+};
+
+
+/* event codes for temp_event */
+#define LPFC_CRIT_TEMP          0x1
+#define LPFC_THRESHOLD_TEMP     0x2
+#define LPFC_NORMAL_TEMP        0x3
+
+struct temp_event {
+        uint32_t event_type;
+        uint32_t event_code;
+        uint32_t data;
+};
+
diff --git a/drivers/scsi/lpfc/lpfc_nportdisc.c b/drivers/scsi/lpfc/lpfc_nportdisc.c
index 6688a8689b56..0c25d97acb42 100644
--- a/drivers/scsi/lpfc/lpfc_nportdisc.c
+++ b/drivers/scsi/lpfc/lpfc_nportdisc.c
@@ -30,6 +30,7 @@
 
 #include "lpfc_hw.h"
 #include "lpfc_sli.h"
+#include "lpfc_nl.h"
 #include "lpfc_disc.h"
 #include "lpfc_scsi.h"
 #include "lpfc.h"
@@ -1003,20 +1004,8 @@ lpfc_rcv_plogi_adisc_issue(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                         spin_lock_irq(shost->host_lock);
                         ndlp->nlp_flag &= ~NLP_NPR_2B_DISC;
                         spin_unlock_irq(shost->host_lock);
-
-                        if (vport->num_disc_nodes) {
+                        if (vport->num_disc_nodes)
                                 lpfc_more_adisc(vport);
-                                if ((vport->num_disc_nodes == 0) &&
-                                    (vport->fc_npr_cnt))
-                                        lpfc_els_disc_plogi(vport);
-                                if (vport->num_disc_nodes == 0) {
-                                        spin_lock_irq(shost->host_lock);
-                                        vport->fc_flag &= ~FC_NDISC_ACTIVE;
-                                        spin_unlock_irq(shost->host_lock);
-                                        lpfc_can_disctmo(vport);
-                                        lpfc_end_rscn(vport);
-                                }
-                        }
                 }
                 return ndlp->nlp_state;
         }
@@ -1865,8 +1854,13 @@ static uint32_t
 lpfc_cmpl_logo_npr_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                         void *arg, uint32_t evt)
 {
+        struct Scsi_Host *shost = lpfc_shost_from_vport(vport);
+        if (ndlp->nlp_DID == Fabric_DID) {
+                spin_lock_irq(shost->host_lock);
+                vport->fc_flag &= ~(FC_FABRIC | FC_PUBLIC_LOOP);
+                spin_unlock_irq(shost->host_lock);
+        }
         lpfc_unreg_rpi(vport, ndlp);
-        /* This routine does nothing, just return the current state */
         return ndlp->nlp_state;
 }
 
@@ -2155,7 +2149,7 @@ lpfc_disc_state_machine(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
                 lpfc_nlp_put(ndlp);
         } else {
                 lpfc_printf_vlog(vport, KERN_INFO, LOG_DISCOVERY,
-                        "0212 DSM out state %d on NPort free\n", rc);
+                        "0213 DSM out state %d on NPort free\n", rc);
 
                 lpfc_debugfs_disc_trc(vport, LPFC_DISC_TRC_DSM,
                         "DSM out:         ste:%d did:x%x flg:x%x",
diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c
index 1bcebbd3dfac..bd1867411821 100644
--- a/drivers/scsi/lpfc/lpfc_scsi.c
+++ b/drivers/scsi/lpfc/lpfc_scsi.c
@@ -32,6 +32,7 @@
 #include "lpfc_version.h"
 #include "lpfc_hw.h"
 #include "lpfc_sli.h"
+#include "lpfc_nl.h"
 #include "lpfc_disc.h"
 #include "lpfc_scsi.h"
 #include "lpfc.h"
@@ -42,6 +43,111 @@
 #define LPFC_RESET_WAIT  2
 #define LPFC_ABORT_WAIT  2
 
+/**
+ * lpfc_update_stats: Update statistical data for the command completion.
+ * @phba: Pointer to HBA object.
+ * @lpfc_cmd: lpfc scsi command object pointer.
+ *
+ * This function is called when there is a command completion and this
+ * function updates the statistical data for the command completion.
+ **/
+static void
+lpfc_update_stats(struct lpfc_hba *phba, struct  lpfc_scsi_buf *lpfc_cmd)
+{
+        struct lpfc_rport_data *rdata = lpfc_cmd->rdata;
+        struct lpfc_nodelist *pnode = rdata->pnode;
+        struct scsi_cmnd *cmd = lpfc_cmd->pCmd;
+        unsigned long flags;
+        struct Scsi_Host  *shost = cmd->device->host;
+        struct lpfc_vport *vport = (struct lpfc_vport *) shost->hostdata;
+        unsigned long latency;
+        int i;
+
+        if (cmd->result)
+                return;
+
+        spin_lock_irqsave(shost->host_lock, flags);
+        if (!vport->stat_data_enabled ||
+                vport->stat_data_blocked ||
+                !pnode->lat_data ||
+                (phba->bucket_type == LPFC_NO_BUCKET)) {
+                spin_unlock_irqrestore(shost->host_lock, flags);
+                return;
+        }
+        latency = jiffies_to_msecs(jiffies - lpfc_cmd->start_time);
+
+        if (phba->bucket_type == LPFC_LINEAR_BUCKET) {
+                i = (latency + phba->bucket_step - 1 - phba->bucket_base)/
+                        phba->bucket_step;
+                if (i >= LPFC_MAX_BUCKET_COUNT)
+                        i = LPFC_MAX_BUCKET_COUNT;
+        } else {
+                for (i = 0; i < LPFC_MAX_BUCKET_COUNT-1; i++)
+                        if (latency <= (phba->bucket_base +
+                                ((1<<i)*phba->bucket_step)))
+                                break;
+        }
+
+        pnode->lat_data[i].cmd_count++;
+        spin_unlock_irqrestore(shost->host_lock, flags);
+}
+
+
+/**
+ * lpfc_send_sdev_queuedepth_change_event: Posts a queuedepth change
+ *                   event.
+ * @phba: Pointer to HBA context object.
+ * @vport: Pointer to vport object.
+ * @ndlp: Pointer to FC node associated with the target.
+ * @lun: Lun number of the scsi device.
+ * @old_val: Old value of the queue depth.
+ * @new_val: New value of the queue depth.
+ *
+ * This function sends an event to the mgmt application indicating
+ * there is a change in the scsi device queue depth.
+ **/
+static void
+lpfc_send_sdev_queuedepth_change_event(struct lpfc_hba *phba,
+                struct lpfc_vport  *vport,
+                struct lpfc_nodelist *ndlp,
+                uint32_t lun,
+                uint32_t old_val,
+                uint32_t new_val)
+{
+        struct lpfc_fast_path_event *fast_path_evt;
+        unsigned long flags;
+
+        fast_path_evt = lpfc_alloc_fast_evt(phba);
+        if (!fast_path_evt)
+                return;
+
+        fast_path_evt->un.queue_depth_evt.scsi_event.event_type =
+                FC_REG_SCSI_EVENT;
+        fast_path_evt->un.queue_depth_evt.scsi_event.subcategory =
+                LPFC_EVENT_VARQUEDEPTH;
+
+        /* Report all luns with change in queue depth */
+        fast_path_evt->un.queue_depth_evt.scsi_event.lun = lun;
+        if (ndlp && NLP_CHK_NODE_ACT(ndlp)) {
+                memcpy(&fast_path_evt->un.queue_depth_evt.scsi_event.wwpn,
+                        &ndlp->nlp_portname, sizeof(struct lpfc_name));
+                memcpy(&fast_path_evt->un.queue_depth_evt.scsi_event.wwnn,
+                        &ndlp->nlp_nodename, sizeof(struct lpfc_name));
+        }
+
+        fast_path_evt->un.queue_depth_evt.oldval = old_val;
+        fast_path_evt->un.queue_depth_evt.newval = new_val;
+        fast_path_evt->vport = vport;
+
+        fast_path_evt->work_evt.evt = LPFC_EVT_FASTPATH_MGMT_EVT;
+        spin_lock_irqsave(&phba->hbalock, flags);
+        list_add_tail(&fast_path_evt->work_evt.evt_listp, &phba->work_list);
+        spin_unlock_irqrestore(&phba->hbalock, flags);
+        lpfc_worker_wake_up(phba);
+
+        return;
+}
+
 /*
  * This function is called with no lock held when there is a resource
  * error in driver or in firmware.
@@ -117,9 +223,10 @@ lpfc_ramp_down_queue_handler(struct lpfc_hba *phba)
         struct lpfc_vport **vports;
         struct Scsi_Host  *shost;
         struct scsi_device *sdev;
-        unsigned long new_queue_depth;
+        unsigned long new_queue_depth, old_queue_depth;
         unsigned long num_rsrc_err, num_cmd_success;
         int i;
+        struct lpfc_rport_data *rdata;
 
         num_rsrc_err = atomic_read(&phba->num_rsrc_err);
         num_cmd_success = atomic_read(&phba->num_cmd_success);
@@ -137,6 +244,7 @@ lpfc_ramp_down_queue_handler(struct lpfc_hba *phba)
                                 else
                                         new_queue_depth = sdev->queue_depth -
                                                                 new_queue_depth;
+                                old_queue_depth = sdev->queue_depth;
                                 if (sdev->ordered_tags)
                                         scsi_adjust_queue_depth(sdev,
                                                         MSG_ORDERED_TAG,
@@ -145,6 +253,13 @@ lpfc_ramp_down_queue_handler(struct lpfc_hba *phba)
                                         scsi_adjust_queue_depth(sdev,
                                                         MSG_SIMPLE_TAG,
                                                         new_queue_depth);
+                                rdata = sdev->hostdata;
+                                if (rdata)
+                                        lpfc_send_sdev_queuedepth_change_event(
+                                                phba, vports[i],
+                                                rdata->pnode,
+                                                sdev->lun, old_queue_depth,
+                                                new_queue_depth);
                         }
                 }
         lpfc_destroy_vport_work_array(phba, vports);
@@ -159,6 +274,7 @@ lpfc_ramp_up_queue_handler(struct lpfc_hba *phba)
         struct Scsi_Host  *shost;
         struct scsi_device *sdev;
         int i;
+        struct lpfc_rport_data *rdata;
 
         vports = lpfc_create_vport_work_array(phba);
         if (vports != NULL)
@@ -176,6 +292,14 @@ lpfc_ramp_up_queue_handler(struct lpfc_hba *phba)
                                         scsi_adjust_queue_depth(sdev,
                                                         MSG_SIMPLE_TAG,
                                                         sdev->queue_depth+1);
+                                rdata = sdev->hostdata;
+                                if (rdata)
+                                        lpfc_send_sdev_queuedepth_change_event(
+                                                phba, vports[i],
+                                                rdata->pnode,
+                                                sdev->lun,
+                                                sdev->queue_depth - 1,
+                                                sdev->queue_depth);
                         }
                 }
         lpfc_destroy_vport_work_array(phba, vports);
@@ -183,6 +307,35 @@ lpfc_ramp_up_queue_handler(struct lpfc_hba *phba)
         atomic_set(&phba->num_cmd_success, 0);
 }
 
+/**
+ * lpfc_scsi_dev_block: set all scsi hosts to block state.
+ * @phba: Pointer to HBA context object.
+ *
+ * This function walks vport list and set each SCSI host to block state
+ * by invoking fc_remote_port_delete() routine. This function is invoked
+ * with EEH when device's PCI slot has been permanently disabled.
+ **/
+void
+lpfc_scsi_dev_block(struct lpfc_hba *phba)
+{
+        struct lpfc_vport **vports;
+        struct Scsi_Host  *shost;
+        struct scsi_device *sdev;
+        struct fc_rport *rport;
+        int i;
+
+        vports = lpfc_create_vport_work_array(phba);
+        if (vports != NULL)
+                for (i = 0; i <= phba->max_vpi && vports[i] != NULL; i++) {
+                        shost = lpfc_shost_from_vport(vports[i]);
+                        shost_for_each_device(sdev, shost) {
+                                rport = starget_to_rport(scsi_target(sdev));
+                                fc_remote_port_delete(rport);
+                        }
+                }
+        lpfc_destroy_vport_work_array(phba, vports);
+}
+
 /*
  * This routine allocates a scsi buffer, which contains all the necessary
  * information needed to initiate a SCSI I/O.  The non-DMAable buffer region
@@ -198,7 +351,9 @@ lpfc_new_scsi_buf(struct lpfc_vport *vport)
         struct lpfc_scsi_buf *psb;
         struct ulp_bde64 *bpl;
         IOCB_t *iocb;
-        dma_addr_t pdma_phys;
+        dma_addr_t pdma_phys_fcp_cmd;
+        dma_addr_t pdma_phys_fcp_rsp;
+        dma_addr_t pdma_phys_bpl;
         uint16_t iotag;
 
         psb = kzalloc(sizeof(struct lpfc_scsi_buf), GFP_KERNEL);
@@ -238,40 +393,60 @@ lpfc_new_scsi_buf(struct lpfc_vport *vport)
 
         /* Initialize local short-hand pointers. */
         bpl = psb->fcp_bpl;
-        pdma_phys = psb->dma_handle;
+        pdma_phys_fcp_cmd = psb->dma_handle;
+        pdma_phys_fcp_rsp = psb->dma_handle + sizeof(struct fcp_cmnd);
+        pdma_phys_bpl = psb->dma_handle + sizeof(struct fcp_cmnd) +
+                        sizeof(struct fcp_rsp);
 
         /*
          * The first two bdes are the FCP_CMD and FCP_RSP.  The balance are sg
          * list bdes.  Initialize the first two and leave the rest for
          * queuecommand.
          */
-        bpl->addrHigh = le32_to_cpu(putPaddrHigh(pdma_phys));
-        bpl->addrLow = le32_to_cpu(putPaddrLow(pdma_phys));
-        bpl->tus.f.bdeSize = sizeof (struct fcp_cmnd);
-        bpl->tus.f.bdeFlags = BUFF_USE_CMND;
-        bpl->tus.w = le32_to_cpu(bpl->tus.w);
-        bpl++;
+        bpl[0].addrHigh = le32_to_cpu(putPaddrHigh(pdma_phys_fcp_cmd));
+        bpl[0].addrLow = le32_to_cpu(putPaddrLow(pdma_phys_fcp_cmd));
+        bpl[0].tus.f.bdeSize = sizeof(struct fcp_cmnd);
+        bpl[0].tus.f.bdeFlags = BUFF_TYPE_BDE_64;
+        bpl[0].tus.w = le32_to_cpu(bpl->tus.w);
 
         /* Setup the physical region for the FCP RSP */
-        pdma_phys += sizeof (struct fcp_cmnd);
-        bpl->addrHigh = le32_to_cpu(putPaddrHigh(pdma_phys));
-        bpl->addrLow = le32_to_cpu(putPaddrLow(pdma_phys));
-        bpl->tus.f.bdeSize = sizeof (struct fcp_rsp);
-        bpl->tus.f.bdeFlags = (BUFF_USE_CMND | BUFF_USE_RCV);
-        bpl->tus.w = le32_to_cpu(bpl->tus.w);
+        bpl[1].addrHigh = le32_to_cpu(putPaddrHigh(pdma_phys_fcp_rsp));
+        bpl[1].addrLow = le32_to_cpu(putPaddrLow(pdma_phys_fcp_rsp));
+        bpl[1].tus.f.bdeSize = sizeof(struct fcp_rsp);
+        bpl[1].tus.f.bdeFlags = BUFF_TYPE_BDE_64;
+        bpl[1].tus.w = le32_to_cpu(bpl->tus.w);
 
         /*
          * Since the IOCB for the FCP I/O is built into this lpfc_scsi_buf,
          * initialize it with all known data now.
          */
-        pdma_phys += (sizeof (struct fcp_rsp));
         iocb = &psb->cur_iocbq.iocb;
         iocb->un.fcpi64.bdl.ulpIoTag32 = 0;
-        iocb->un.fcpi64.bdl.addrHigh = putPaddrHigh(pdma_phys);
-        iocb->un.fcpi64.bdl.addrLow = putPaddrLow(pdma_phys);
-        iocb->un.fcpi64.bdl.bdeSize = (2 * sizeof (struct ulp_bde64));
-        iocb->un.fcpi64.bdl.bdeFlags = BUFF_TYPE_BDL;
-        iocb->ulpBdeCount = 1;
+        if (phba->sli_rev == 3) {
+                /* fill in immediate fcp command BDE */
+                iocb->un.fcpi64.bdl.bdeFlags = BUFF_TYPE_BDE_IMMED;
+                iocb->un.fcpi64.bdl.bdeSize = sizeof(struct fcp_cmnd);
+                iocb->un.fcpi64.bdl.addrLow = offsetof(IOCB_t,
+                                                       unsli3.fcp_ext.icd);
+                iocb->un.fcpi64.bdl.addrHigh = 0;
+                iocb->ulpBdeCount = 0;
+                iocb->ulpLe = 0;
+                /* fill in responce BDE */
+                iocb->unsli3.fcp_ext.rbde.tus.f.bdeFlags = BUFF_TYPE_BDE_64;
+                iocb->unsli3.fcp_ext.rbde.tus.f.bdeSize =
+                                                sizeof(struct fcp_rsp);
+                iocb->unsli3.fcp_ext.rbde.addrLow =
+                                                putPaddrLow(pdma_phys_fcp_rsp);
+                iocb->unsli3.fcp_ext.rbde.addrHigh =
+                                                putPaddrHigh(pdma_phys_fcp_rsp);
+        } else {
+                iocb->un.fcpi64.bdl.bdeFlags = BUFF_TYPE_BLP_64;
+                iocb->un.fcpi64.bdl.bdeSize = (2 * sizeof(struct ulp_bde64));
+                iocb->un.fcpi64.bdl.addrLow = putPaddrLow(pdma_phys_bpl);
+                iocb->un.fcpi64.bdl.addrHigh = putPaddrHigh(pdma_phys_bpl);
+                iocb->ulpBdeCount = 1;
+                iocb->ulpLe = 1;
+        }
         iocb->ulpClass = CLASS3;
 
         return psb;
@@ -313,8 +488,9 @@ lpfc_scsi_prep_dma_buf(struct lpfc_hba *phba, struct lpfc_scsi_buf *lpfc_cmd)
         struct fcp_cmnd *fcp_cmnd = lpfc_cmd->fcp_cmnd;
         struct ulp_bde64 *bpl = lpfc_cmd->fcp_bpl;
         IOCB_t *iocb_cmd = &lpfc_cmd->cur_iocbq.iocb;
+        struct ulp_bde64 *data_bde = iocb_cmd->unsli3.fcp_ext.dbde;
         dma_addr_t physaddr;
-        uint32_t i, num_bde = 0;
+        uint32_t num_bde = 0;
         int nseg, datadir = scsi_cmnd->sc_data_direction;
 
         /*
@@ -352,37 +528,159 @@ lpfc_scsi_prep_dma_buf(struct lpfc_hba *phba, struct lpfc_scsi_buf *lpfc_cmd)
                  * during probe that limits the number of sg elements in any
                  * single scsi command.  Just run through the seg_cnt and format
                  * the bde's.
+                 * When using SLI-3 the driver will try to fit all the BDEs into
+                 * the IOCB. If it can't then the BDEs get added to a BPL as it
+                 * does for SLI-2 mode.
                  */
-                scsi_for_each_sg(scsi_cmnd, sgel, nseg, i) {
+                scsi_for_each_sg(scsi_cmnd, sgel, nseg, num_bde) {
                         physaddr = sg_dma_address(sgel);
-                        bpl->addrLow = le32_to_cpu(putPaddrLow(physaddr));
-                        bpl->addrHigh = le32_to_cpu(putPaddrHigh(physaddr));
-                        bpl->tus.f.bdeSize = sg_dma_len(sgel);
-                        if (datadir == DMA_TO_DEVICE)
-                                bpl->tus.f.bdeFlags = 0;
-                        else
-                                bpl->tus.f.bdeFlags = BUFF_USE_RCV;
-                        bpl->tus.w = le32_to_cpu(bpl->tus.w);
-                        bpl++;
-                        num_bde++;
+                        if (phba->sli_rev == 3 &&
+                            nseg <= LPFC_EXT_DATA_BDE_COUNT) {
+                                data_bde->tus.f.bdeFlags = BUFF_TYPE_BDE_64;
+                                data_bde->tus.f.bdeSize = sg_dma_len(sgel);
+                                data_bde->addrLow = putPaddrLow(physaddr);
+                                data_bde->addrHigh = putPaddrHigh(physaddr);
+                                data_bde++;
+                        } else {
+                                bpl->tus.f.bdeFlags = BUFF_TYPE_BDE_64;
+                                bpl->tus.f.bdeSize = sg_dma_len(sgel);
+                                bpl->tus.w = le32_to_cpu(bpl->tus.w);
+                                bpl->addrLow =
+                                        le32_to_cpu(putPaddrLow(physaddr));
+                                bpl->addrHigh =
+                                        le32_to_cpu(putPaddrHigh(physaddr));
+                                bpl++;
+                        }
                 }
         }
 
         /*
          * Finish initializing those IOCB fields that are dependent on the
-         * scsi_cmnd request_buffer.  Note that the bdeSize is explicitly
-         * reinitialized since all iocb memory resources are used many times
-         * for transmit, receive, and continuation bpl's.
+         * scsi_cmnd request_buffer.  Note that for SLI-2 the bdeSize is
+         * explicitly reinitialized and for SLI-3 the extended bde count is
+         * explicitly reinitialized since all iocb memory resources are reused.
          */
-        iocb_cmd->un.fcpi64.bdl.bdeSize = (2 * sizeof (struct ulp_bde64));
-        iocb_cmd->un.fcpi64.bdl.bdeSize +=
-                (num_bde * sizeof (struct ulp_bde64));
-        iocb_cmd->ulpBdeCount = 1;
-        iocb_cmd->ulpLe = 1;
+        if (phba->sli_rev == 3) {
+                if (num_bde > LPFC_EXT_DATA_BDE_COUNT) {
+                        /*
+                         * The extended IOCB format can only fit 3 BDE or a BPL.
+                         * This I/O has more than 3 BDE so the 1st data bde will
+                         * be a BPL that is filled in here.
+                         */
+                        physaddr = lpfc_cmd->dma_handle;
+                        data_bde->tus.f.bdeFlags = BUFF_TYPE_BLP_64;
+                        data_bde->tus.f.bdeSize = (num_bde *
+                                                   sizeof(struct ulp_bde64));
+                        physaddr += (sizeof(struct fcp_cmnd) +
+                                     sizeof(struct fcp_rsp) +
+                                     (2 * sizeof(struct ulp_bde64)));
+                        data_bde->addrHigh = putPaddrHigh(physaddr);
+                        data_bde->addrLow = putPaddrLow(physaddr);
+                        /* ebde count includes the responce bde and data bpl */
+                        iocb_cmd->unsli3.fcp_ext.ebde_count = 2;
+                } else {
+                        /* ebde count includes the responce bde and data bdes */
+                        iocb_cmd->unsli3.fcp_ext.ebde_count = (num_bde + 1);
+                }
+        } else {
+                iocb_cmd->un.fcpi64.bdl.bdeSize =
+                        ((num_bde + 2) * sizeof(struct ulp_bde64));
+        }
         fcp_cmnd->fcpDl = cpu_to_be32(scsi_bufflen(scsi_cmnd));
         return 0;
 }
 
+/**
+ * lpfc_send_scsi_error_event: Posts an event when there is SCSI error.
+ * @phba: Pointer to hba context object.
+ * @vport: Pointer to vport object.
+ * @lpfc_cmd: Pointer to lpfc scsi command which reported the error.
+ * @rsp_iocb: Pointer to response iocb object which reported error.
+ *
+ * This function posts an event when there is a SCSI command reporting
+ * error from the scsi device.
+ **/
+static void
+lpfc_send_scsi_error_event(struct lpfc_hba *phba, struct lpfc_vport *vport,
+                struct lpfc_scsi_buf *lpfc_cmd, struct lpfc_iocbq *rsp_iocb) {
+        struct scsi_cmnd *cmnd = lpfc_cmd->pCmd;
+        struct fcp_rsp *fcprsp = lpfc_cmd->fcp_rsp;
+        uint32_t resp_info = fcprsp->rspStatus2;
+        uint32_t scsi_status = fcprsp->rspStatus3;
+        uint32_t fcpi_parm = rsp_iocb->iocb.un.fcpi.fcpi_parm;
+        struct lpfc_fast_path_event *fast_path_evt = NULL;
+        struct lpfc_nodelist *pnode = lpfc_cmd->rdata->pnode;
+        unsigned long flags;
+
+        /* If there is queuefull or busy condition send a scsi event */
+        if ((cmnd->result == SAM_STAT_TASK_SET_FULL) ||
+                (cmnd->result == SAM_STAT_BUSY)) {
+                fast_path_evt = lpfc_alloc_fast_evt(phba);
+                if (!fast_path_evt)
+                        return;
+                fast_path_evt->un.scsi_evt.event_type =
+                        FC_REG_SCSI_EVENT;
+                fast_path_evt->un.scsi_evt.subcategory =
+                (cmnd->result == SAM_STAT_TASK_SET_FULL) ?
+                LPFC_EVENT_QFULL : LPFC_EVENT_DEVBSY;
+                fast_path_evt->un.scsi_evt.lun = cmnd->device->lun;
+                memcpy(&fast_path_evt->un.scsi_evt.wwpn,
+                        &pnode->nlp_portname, sizeof(struct lpfc_name));
+                memcpy(&fast_path_evt->un.scsi_evt.wwnn,
+                        &pnode->nlp_nodename, sizeof(struct lpfc_name));
+        } else if ((resp_info & SNS_LEN_VALID) && fcprsp->rspSnsLen &&
+                ((cmnd->cmnd[0] == READ_10) || (cmnd->cmnd[0] == WRITE_10))) {
+                fast_path_evt = lpfc_alloc_fast_evt(phba);
+                if (!fast_path_evt)
+                        return;
+                fast_path_evt->un.check_cond_evt.scsi_event.event_type =
+                        FC_REG_SCSI_EVENT;
+                fast_path_evt->un.check_cond_evt.scsi_event.subcategory =
+                        LPFC_EVENT_CHECK_COND;
+                fast_path_evt->un.check_cond_evt.scsi_event.lun =
+                        cmnd->device->lun;
+                memcpy(&fast_path_evt->un.check_cond_evt.scsi_event.wwpn,
+                        &pnode->nlp_portname, sizeof(struct lpfc_name));
+                memcpy(&fast_path_evt->un.check_cond_evt.scsi_event.wwnn,
+                        &pnode->nlp_nodename, sizeof(struct lpfc_name));
+                fast_path_evt->un.check_cond_evt.sense_key =
+                        cmnd->sense_buffer[2] & 0xf;
+                fast_path_evt->un.check_cond_evt.asc = cmnd->sense_buffer[12];
+                fast_path_evt->un.check_cond_evt.ascq = cmnd->sense_buffer[13];
+        } else if ((cmnd->sc_data_direction == DMA_FROM_DEVICE) &&
+                     fcpi_parm &&
+                     ((be32_to_cpu(fcprsp->rspResId) != fcpi_parm) ||
+                        ((scsi_status == SAM_STAT_GOOD) &&
+                        !(resp_info & (RESID_UNDER | RESID_OVER))))) {
+                /*
+                 * If status is good or resid does not match with fcp_param and
+                 * there is valid fcpi_parm, then there is a read_check error
+                 */
+                fast_path_evt = lpfc_alloc_fast_evt(phba);
+                if (!fast_path_evt)
+                        return;
+                fast_path_evt->un.read_check_error.header.event_type =
+                        FC_REG_FABRIC_EVENT;
+                fast_path_evt->un.read_check_error.header.subcategory =
+                        LPFC_EVENT_FCPRDCHKERR;
+                memcpy(&fast_path_evt->un.read_check_error.header.wwpn,
+                        &pnode->nlp_portname, sizeof(struct lpfc_name));
+                memcpy(&fast_path_evt->un.read_check_error.header.wwnn,
+                        &pnode->nlp_nodename, sizeof(struct lpfc_name));
+                fast_path_evt->un.read_check_error.lun = cmnd->device->lun;
+                fast_path_evt->un.read_check_error.opcode = cmnd->cmnd[0];
+                fast_path_evt->un.read_check_error.fcpiparam =
+                        fcpi_parm;
+        } else
+                return;
+
+        fast_path_evt->vport = vport;
+        spin_lock_irqsave(&phba->hbalock, flags);
+        list_add_tail(&fast_path_evt->work_evt.evt_listp, &phba->work_list);
+        spin_unlock_irqrestore(&phba->hbalock, flags);
+        lpfc_worker_wake_up(phba);
+        return;
+}
 static void
 lpfc_scsi_unprep_dma_buf(struct lpfc_hba * phba, struct lpfc_scsi_buf * psb)
 {
@@ -411,6 +709,7 @@ lpfc_handle_fcp_err(struct lpfc_vport *vport, struct lpfc_scsi_buf *lpfc_cmd,
         uint32_t rsplen = 0;
         uint32_t logit = LOG_FCP | LOG_FCP_ERROR;
 
+
         /*
          *  If this is a task management command, there is no
          *  scsi packet associated with this lpfc_cmd.  The driver
@@ -526,6 +825,7 @@ lpfc_handle_fcp_err(struct lpfc_vport *vport, struct lpfc_scsi_buf *lpfc_cmd,
 
  out:
         cmnd->result = ScsiResult(host_status, scsi_status);
+        lpfc_send_scsi_error_event(vport->phba, vport, lpfc_cmd, rsp_iocb);
 }
 
 static void
@@ -542,9 +842,11 @@ lpfc_scsi_cmd_iocb_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pIocbIn,
         struct scsi_device *sdev, *tmp_sdev;
         int depth = 0;
         unsigned long flags;
+        struct lpfc_fast_path_event *fast_path_evt;
 
         lpfc_cmd->result = pIocbOut->iocb.un.ulpWord[4];
         lpfc_cmd->status = pIocbOut->iocb.ulpStatus;
+        atomic_dec(&pnode->cmd_pending);
 
         if (lpfc_cmd->status) {
                 if (lpfc_cmd->status == IOSTAT_LOCAL_REJECT &&
@@ -570,12 +872,36 @@ lpfc_scsi_cmd_iocb_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pIocbIn,
                         break;
                 case IOSTAT_NPORT_BSY:
                 case IOSTAT_FABRIC_BSY:
-                        cmd->result = ScsiResult(DID_BUS_BUSY, 0);
+                        cmd->result = ScsiResult(DID_TRANSPORT_DISRUPTED, 0);
+                        fast_path_evt = lpfc_alloc_fast_evt(phba);
+                        if (!fast_path_evt)
+                                break;
+                        fast_path_evt->un.fabric_evt.event_type =
+                                FC_REG_FABRIC_EVENT;
+                        fast_path_evt->un.fabric_evt.subcategory =
+                                (lpfc_cmd->status == IOSTAT_NPORT_BSY) ?
+                                LPFC_EVENT_PORT_BUSY : LPFC_EVENT_FABRIC_BUSY;
+                        if (pnode && NLP_CHK_NODE_ACT(pnode)) {
+                                memcpy(&fast_path_evt->un.fabric_evt.wwpn,
+                                        &pnode->nlp_portname,
+                                        sizeof(struct lpfc_name));
+                                memcpy(&fast_path_evt->un.fabric_evt.wwnn,
+                                        &pnode->nlp_nodename,
+                                        sizeof(struct lpfc_name));
+                        }
+                        fast_path_evt->vport = vport;
+                        fast_path_evt->work_evt.evt =
+                                LPFC_EVT_FASTPATH_MGMT_EVT;
+                        spin_lock_irqsave(&phba->hbalock, flags);
+                        list_add_tail(&fast_path_evt->work_evt.evt_listp,
+                                &phba->work_list);
+                        spin_unlock_irqrestore(&phba->hbalock, flags);
+                        lpfc_worker_wake_up(phba);
                         break;
                 case IOSTAT_LOCAL_REJECT:
-                        if (lpfc_cmd->result == RJT_UNAVAIL_PERM ||
+                        if (lpfc_cmd->result == IOERR_INVALID_RPI ||
                             lpfc_cmd->result == IOERR_NO_RESOURCES ||
-                            lpfc_cmd->result == RJT_LOGIN_REQUIRED) {
+                            lpfc_cmd->result == IOERR_ABORT_REQUESTED) {
                                 cmd->result = ScsiResult(DID_REQUEUE, 0);
                                 break;
                         } /* else: fall through */
@@ -586,7 +912,8 @@ lpfc_scsi_cmd_iocb_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pIocbIn,
 
                 if (!pnode || !NLP_CHK_NODE_ACT(pnode)
                     || (pnode->nlp_state != NLP_STE_MAPPED_NODE))
-                        cmd->result = ScsiResult(DID_BUS_BUSY, SAM_STAT_BUSY);
+                        cmd->result = ScsiResult(DID_TRANSPORT_DISRUPTED,
+                                                 SAM_STAT_BUSY);
         } else {
                 cmd->result = ScsiResult(DID_OK, 0);
         }
@@ -602,8 +929,32 @@ lpfc_scsi_cmd_iocb_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pIocbIn,
                                  scsi_get_resid(cmd));
         }
 
+        lpfc_update_stats(phba, lpfc_cmd);
         result = cmd->result;
         sdev = cmd->device;
+        if (vport->cfg_max_scsicmpl_time &&
+           time_after(jiffies, lpfc_cmd->start_time +
+                msecs_to_jiffies(vport->cfg_max_scsicmpl_time))) {
+                spin_lock_irqsave(sdev->host->host_lock, flags);
+                if ((pnode->cmd_qdepth > atomic_read(&pnode->cmd_pending) &&
+                    (atomic_read(&pnode->cmd_pending) > LPFC_MIN_TGT_QDEPTH) &&
+                    ((cmd->cmnd[0] == READ_10) || (cmd->cmnd[0] == WRITE_10))))
+                        pnode->cmd_qdepth = atomic_read(&pnode->cmd_pending);
+
+                pnode->last_change_time = jiffies;
+                spin_unlock_irqrestore(sdev->host->host_lock, flags);
+        } else if ((pnode->cmd_qdepth < LPFC_MAX_TGT_QDEPTH) &&
+                   time_after(jiffies, pnode->last_change_time +
+                        msecs_to_jiffies(LPFC_TGTQ_INTERVAL))) {
+                spin_lock_irqsave(sdev->host->host_lock, flags);
+                pnode->cmd_qdepth += pnode->cmd_qdepth *
+                        LPFC_TGTQ_RAMPUP_PCENT / 100;
+                if (pnode->cmd_qdepth > LPFC_MAX_TGT_QDEPTH)
+                        pnode->cmd_qdepth = LPFC_MAX_TGT_QDEPTH;
+                pnode->last_change_time = jiffies;
+                spin_unlock_irqrestore(sdev->host->host_lock, flags);
+        }
+
         lpfc_scsi_unprep_dma_buf(phba, lpfc_cmd);
         cmd->scsi_done(cmd);
 
@@ -647,6 +998,9 @@ lpfc_scsi_cmd_iocb_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pIocbIn,
                                 pnode->last_ramp_up_time = jiffies;
                         }
                 }
+                lpfc_send_sdev_queuedepth_change_event(phba, vport, pnode,
+                        0xFFFFFFFF,
+                        sdev->queue_depth - 1, sdev->queue_depth);
         }
 
         /*
@@ -676,6 +1030,9 @@ lpfc_scsi_cmd_iocb_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pIocbIn,
                         lpfc_printf_vlog(vport, KERN_WARNING, LOG_FCP,
                                          "0711 detected queue full - lun queue "
                                          "depth adjusted to %d.\n", depth);
+                        lpfc_send_sdev_queuedepth_change_event(phba, vport,
+                                pnode, 0xFFFFFFFF,
+                                depth+1, depth);
                 }
         }
 
@@ -692,6 +1049,24 @@ lpfc_scsi_cmd_iocb_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pIocbIn,
         lpfc_release_scsi_buf(phba, lpfc_cmd);
 }
 
+/**
+ * lpfc_fcpcmd_to_iocb - copy the fcp_cmd data into the IOCB.
+ * @data: A pointer to the immediate command data portion of the IOCB.
+ * @fcp_cmnd: The FCP Command that is provided by the SCSI layer.
+ *
+ * The routine copies the entire FCP command from @fcp_cmnd to @data while
+ * byte swapping the data to big endian format for transmission on the wire.
+ **/
+static void
+lpfc_fcpcmd_to_iocb(uint8_t *data, struct fcp_cmnd *fcp_cmnd)
+{
+        int i, j;
+        for (i = 0, j = 0; i < sizeof(struct fcp_cmnd);
+             i += sizeof(uint32_t), j++) {
+                ((uint32_t *)data)[j] = cpu_to_be32(((uint32_t *)fcp_cmnd)[j]);
+        }
+}
+
 static void
 lpfc_scsi_prep_cmnd(struct lpfc_vport *vport, struct lpfc_scsi_buf *lpfc_cmd,
                     struct lpfc_nodelist *pnode)
@@ -758,7 +1133,8 @@ lpfc_scsi_prep_cmnd(struct lpfc_vport *vport, struct lpfc_scsi_buf *lpfc_cmd,
                 fcp_cmnd->fcpCntl3 = 0;
                 phba->fc4ControlRequests++;
         }
-
+        if (phba->sli_rev == 3)
+                lpfc_fcpcmd_to_iocb(iocb_cmd->unsli3.fcp_ext.icd, fcp_cmnd);
         /*
          * Finish initializing those IOCB fields that are independent
          * of the scsi_cmnd request_buffer
@@ -798,11 +1174,13 @@ lpfc_scsi_prep_task_mgmt_cmd(struct lpfc_vport *vport,
         piocb = &piocbq->iocb;
 
         fcp_cmnd = lpfc_cmd->fcp_cmnd;
-        int_to_scsilun(lun, &lpfc_cmd->fcp_cmnd->fcp_lun);
+        /* Clear out any old data in the FCP command area */
+        memset(fcp_cmnd, 0, sizeof(struct fcp_cmnd));
+        int_to_scsilun(lun, &fcp_cmnd->fcp_lun);
         fcp_cmnd->fcpCntl2 = task_mgmt_cmd;
-
+        if (vport->phba->sli_rev == 3)
+                lpfc_fcpcmd_to_iocb(piocb->unsli3.fcp_ext.icd, fcp_cmnd);
         piocb->ulpCommand = CMD_FCP_ICMND64_CR;
-
         piocb->ulpContext = ndlp->nlp_rpi;
         if (ndlp->nlp_fcp_info & NLP_FCP_2_DEVICE) {
                 piocb->ulpFCP2Rcvy = 1;
@@ -967,9 +1345,12 @@ lpfc_queuecommand(struct scsi_cmnd *cmnd, void (*done) (struct scsi_cmnd *))
          * transport is still transitioning.
          */
         if (!ndlp || !NLP_CHK_NODE_ACT(ndlp)) {
-                cmnd->result = ScsiResult(DID_BUS_BUSY, 0);
+                cmnd->result = ScsiResult(DID_TRANSPORT_DISRUPTED, 0);
                 goto out_fail_command;
         }
+        if (atomic_read(&ndlp->cmd_pending) >= ndlp->cmd_qdepth)
+                goto out_host_busy;
+
         lpfc_cmd = lpfc_get_scsi_buf(phba);
         if (lpfc_cmd == NULL) {
                 lpfc_adjust_queue_depth(phba);
@@ -980,6 +1361,7 @@ lpfc_queuecommand(struct scsi_cmnd *cmnd, void (*done) (struct scsi_cmnd *))
                 goto out_host_busy;
         }
 
+        lpfc_cmd->start_time = jiffies;
         /*
          * Store the midlayer's command structure for the completion phase
          * and complete the command initialization.
@@ -987,6 +1369,7 @@ lpfc_queuecommand(struct scsi_cmnd *cmnd, void (*done) (struct scsi_cmnd *))
         lpfc_cmd->pCmd  = cmnd;
         lpfc_cmd->rdata = rdata;
         lpfc_cmd->timeout = 0;
+        lpfc_cmd->start_time = jiffies;
         cmnd->host_scribble = (unsigned char *)lpfc_cmd;
         cmnd->scsi_done = done;
 
@@ -996,6 +1379,7 @@ lpfc_queuecommand(struct scsi_cmnd *cmnd, void (*done) (struct scsi_cmnd *))
 
         lpfc_scsi_prep_cmnd(vport, lpfc_cmd, ndlp);
 
+        atomic_inc(&ndlp->cmd_pending);
         err = lpfc_sli_issue_iocb(phba, &phba->sli.ring[psli->fcp_ring],
                                   &lpfc_cmd->cur_iocbq, SLI_IOCB_RET_IOCB);
         if (err)
@@ -1010,6 +1394,7 @@ lpfc_queuecommand(struct scsi_cmnd *cmnd, void (*done) (struct scsi_cmnd *))
         return 0;
 
  out_host_busy_free_buf:
+        atomic_dec(&ndlp->cmd_pending);
         lpfc_scsi_unprep_dma_buf(phba, lpfc_cmd);
         lpfc_release_scsi_buf(phba, lpfc_cmd);
  out_host_busy:
@@ -1145,6 +1530,7 @@ lpfc_device_reset_handler(struct scsi_cmnd *cmnd)
         int ret = SUCCESS;
         int status;
         int cnt;
+        struct lpfc_scsi_event_header scsi_event;
 
         lpfc_block_error_handler(cmnd);
         /*
@@ -1163,6 +1549,19 @@ lpfc_device_reset_handler(struct scsi_cmnd *cmnd)
                         break;
                 pnode = rdata->pnode;
         }
+
+        scsi_event.event_type = FC_REG_SCSI_EVENT;
+        scsi_event.subcategory = LPFC_EVENT_TGTRESET;
+        scsi_event.lun = 0;
+        memcpy(scsi_event.wwpn, &pnode->nlp_portname, sizeof(struct lpfc_name));
+        memcpy(scsi_event.wwnn, &pnode->nlp_nodename, sizeof(struct lpfc_name));
+
+        fc_host_post_vendor_event(shost,
+                fc_get_event_number(),
+                sizeof(scsi_event),
+                (char *)&scsi_event,
+                SCSI_NL_VID_TYPE_PCI | PCI_VENDOR_ID_EMULEX);
+
         if (!rdata || pnode->nlp_state != NLP_STE_MAPPED_NODE) {
                 lpfc_printf_vlog(vport, KERN_ERR, LOG_FCP,
                                  "0721 LUN Reset rport "
@@ -1242,10 +1641,23 @@ lpfc_bus_reset_handler(struct scsi_cmnd *cmnd)
         struct lpfc_hba   *phba = vport->phba;
         struct lpfc_nodelist *ndlp = NULL;
         int match;
-        int ret = SUCCESS, status, i;
+        int ret = SUCCESS, status = SUCCESS, i;
         int cnt;
         struct lpfc_scsi_buf * lpfc_cmd;
         unsigned long later;
+        struct lpfc_scsi_event_header scsi_event;
+
+        scsi_event.event_type = FC_REG_SCSI_EVENT;
+        scsi_event.subcategory = LPFC_EVENT_BUSRESET;
+        scsi_event.lun = 0;
+        memcpy(scsi_event.wwpn, &vport->fc_portname, sizeof(struct lpfc_name));
+        memcpy(scsi_event.wwnn, &vport->fc_nodename, sizeof(struct lpfc_name));
+
+        fc_host_post_vendor_event(shost,
+                fc_get_event_number(),
+                sizeof(scsi_event),
+                (char *)&scsi_event,
+                SCSI_NL_VID_TYPE_PCI | PCI_VENDOR_ID_EMULEX);
 
         lpfc_block_error_handler(cmnd);
         /*
diff --git a/drivers/scsi/lpfc/lpfc_scsi.h b/drivers/scsi/lpfc/lpfc_scsi.h
index daba92374985..437f182e2322 100644
--- a/drivers/scsi/lpfc/lpfc_scsi.h
+++ b/drivers/scsi/lpfc/lpfc_scsi.h
@@ -107,6 +107,10 @@ struct fcp_cmnd {
 
 };
 
+struct lpfc_scsicmd_bkt {
+        uint32_t cmd_count;
+};
+
 struct lpfc_scsi_buf {
         struct list_head list;
         struct scsi_cmnd *pCmd;
@@ -139,6 +143,7 @@ struct lpfc_scsi_buf {
          */
         struct lpfc_iocbq cur_iocbq;
         wait_queue_head_t *waitq;
+        unsigned long start_time;
 };
 
 #define LPFC_SCSI_DMA_EXT_SIZE 264
diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c
index 50fe07646738..8ab5babdeebc 100644
--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -32,6 +32,7 @@
 
 #include "lpfc_hw.h"
 #include "lpfc_sli.h"
+#include "lpfc_nl.h"
 #include "lpfc_disc.h"
 #include "lpfc_scsi.h"
 #include "lpfc.h"
@@ -66,10 +67,16 @@ typedef enum _lpfc_iocb_type {
         LPFC_ABORT_IOCB
 } lpfc_iocb_type;
 
-                /* SLI-2/SLI-3 provide different sized iocbs.  Given a pointer
-                 * to the start of the ring, and the slot number of the
-                 * desired iocb entry, calc a pointer to that entry.
-                 */
+/**
+ * lpfc_cmd_iocb: Get next command iocb entry in the ring.
+ * @phba: Pointer to HBA context object.
+ * @pring: Pointer to driver SLI ring object.
+ *
+ * This function returns pointer to next command iocb entry
+ * in the command ring. The caller must hold hbalock to prevent
+ * other threads consume the next command iocb.
+ * SLI-2/SLI-3 provide different sized iocbs.
+ **/
 static inline IOCB_t *
 lpfc_cmd_iocb(struct lpfc_hba *phba, struct lpfc_sli_ring *pring)
 {
@@ -77,6 +84,16 @@ lpfc_cmd_iocb(struct lpfc_hba *phba, struct lpfc_sli_ring *pring)
                            pring->cmdidx * phba->iocb_cmd_size);
 }
 
+/**
+ * lpfc_resp_iocb: Get next response iocb entry in the ring.
+ * @phba: Pointer to HBA context object.
+ * @pring: Pointer to driver SLI ring object.
+ *
+ * This function returns pointer to next response iocb entry
+ * in the response ring. The caller must hold hbalock to make sure
+ * that no other thread consume the next response iocb.
+ * SLI-2/SLI-3 provide different sized iocbs.
+ **/
 static inline IOCB_t *
 lpfc_resp_iocb(struct lpfc_hba *phba, struct lpfc_sli_ring *pring)
 {
@@ -84,6 +101,15 @@ lpfc_resp_iocb(struct lpfc_hba *phba, struct lpfc_sli_ring *pring)
                            pring->rspidx * phba->iocb_rsp_size);
 }
 
+/**
+ * __lpfc_sli_get_iocbq: Allocates an iocb object from iocb pool.
+ * @phba: Pointer to HBA context object.
+ *
+ * This function is called with hbalock held. This function
+ * allocates a new driver iocb object from the iocb pool. If the
+ * allocation is successful, it returns pointer to the newly
+ * allocated iocb object else it returns NULL.
+ **/
 static struct lpfc_iocbq *
 __lpfc_sli_get_iocbq(struct lpfc_hba *phba)
 {
@@ -94,6 +120,15 @@ __lpfc_sli_get_iocbq(struct lpfc_hba *phba)
         return iocbq;
 }
 
+/**
+ * lpfc_sli_get_iocbq: Allocates an iocb object from iocb pool.
+ * @phba: Pointer to HBA context object.
+ *
+ * This function is called with no lock held. This function
+ * allocates a new driver iocb object from the iocb pool. If the
+ * allocation is successful, it returns pointer to the newly
+ * allocated iocb object else it returns NULL.
+ **/
 struct lpfc_iocbq *
 lpfc_sli_get_iocbq(struct lpfc_hba *phba)
 {
@@ -106,6 +141,16 @@ lpfc_sli_get_iocbq(struct lpfc_hba *phba)
         return iocbq;
 }
 
+/**
+ * __lpfc_sli_release_iocbq: Release iocb to the iocb pool.
+ * @phba: Pointer to HBA context object.
+ * @iocbq: Pointer to driver iocb object.
+ *
+ * This function is called with hbalock held to release driver
+ * iocb object to the iocb pool. The iotag in the iocb object
+ * does not change for each use of the iocb object. This function
+ * clears all other fields of the iocb object when it is freed.
+ **/
 static void
 __lpfc_sli_release_iocbq(struct lpfc_hba *phba, struct lpfc_iocbq *iocbq)
 {
@@ -118,6 +163,14 @@ __lpfc_sli_release_iocbq(struct lpfc_hba *phba, struct lpfc_iocbq *iocbq)
         list_add_tail(&iocbq->list, &phba->lpfc_iocb_list);
 }
 
+/**
+ * lpfc_sli_release_iocbq: Release iocb to the iocb pool.
+ * @phba: Pointer to HBA context object.
+ * @iocbq: Pointer to driver iocb object.
+ *
+ * This function is called with no lock held to release the iocb to
+ * iocb pool.
+ **/
 void
 lpfc_sli_release_iocbq(struct lpfc_hba *phba, struct lpfc_iocbq *iocbq)
 {
@@ -131,10 +184,21 @@ lpfc_sli_release_iocbq(struct lpfc_hba *phba, struct lpfc_iocbq *iocbq)
         spin_unlock_irqrestore(&phba->hbalock, iflags);
 }
 
-/*
- * Translate the iocb command to an iocb command type used to decide the final
- * disposition of each completed IOCB.
- */
+/**
+ * lpfc_sli_iocb_cmd_type: Get the iocb type.
+ * @iocb_cmnd : iocb command code.
+ *
+ * This function is called by ring event handler function to get the iocb type.
+ * This function translates the iocb command to an iocb command type used to
+ * decide the final disposition of each completed IOCB.
+ * The function returns
+ * LPFC_UNKNOWN_IOCB if it is an unsupported iocb
+ * LPFC_SOL_IOCB     if it is a solicited iocb completion
+ * LPFC_ABORT_IOCB   if it is an abort iocb
+ * LPFC_UNSOL_IOCB   if it is an unsolicited iocb
+ *
+ * The caller is not required to hold any lock.
+ **/
 static lpfc_iocb_type
 lpfc_sli_iocb_cmd_type(uint8_t iocb_cmnd)
 {
@@ -230,6 +294,17 @@ lpfc_sli_iocb_cmd_type(uint8_t iocb_cmnd)
         return type;
 }
 
+/**
+ * lpfc_sli_ring_map: Issue config_ring mbox for all rings.
+ * @phba: Pointer to HBA context object.
+ *
+ * This function is called from SLI initialization code
+ * to configure every ring of the HBA's SLI interface. The
+ * caller is not required to hold any lock. This function issues
+ * a config_ring mailbox command for each ring.
+ * This function returns zero if successful else returns a negative
+ * error code.
+ **/
 static int
 lpfc_sli_ring_map(struct lpfc_hba *phba)
 {
@@ -262,6 +337,18 @@ lpfc_sli_ring_map(struct lpfc_hba *phba)
         return ret;
 }
 
+/**
+ * lpfc_sli_ringtxcmpl_put: Adds new iocb to the txcmplq.
+ * @phba: Pointer to HBA context object.
+ * @pring: Pointer to driver SLI ring object.
+ * @piocb: Pointer to the driver iocb object.
+ *
+ * This function is called with hbalock held. The function adds the
+ * new iocb to txcmplq of the given ring. This function always returns
+ * 0. If this function is called for ELS ring, this function checks if
+ * there is a vport associated with the ELS command. This function also
+ * starts els_tmofunc timer if this is an ELS command.
+ **/
 static int
 lpfc_sli_ringtxcmpl_put(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                         struct lpfc_iocbq *piocb)
@@ -282,6 +369,16 @@ lpfc_sli_ringtxcmpl_put(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
         return 0;
 }
 
+/**
+ * lpfc_sli_ringtx_get: Get first element of the txq.
+ * @phba: Pointer to HBA context object.
+ * @pring: Pointer to driver SLI ring object.
+ *
+ * This function is called with hbalock held to get next
+ * iocb in txq of the given ring. If there is any iocb in
+ * the txq, the function returns first iocb in the list after
+ * removing the iocb from the list, else it returns NULL.
+ **/
 static struct lpfc_iocbq *
 lpfc_sli_ringtx_get(struct lpfc_hba *phba, struct lpfc_sli_ring *pring)
 {
@@ -293,14 +390,25 @@ lpfc_sli_ringtx_get(struct lpfc_hba *phba, struct lpfc_sli_ring *pring)
         return cmd_iocb;
 }
 
+/**
+ * lpfc_sli_next_iocb_slot: Get next iocb slot in the ring.
+ * @phba: Pointer to HBA context object.
+ * @pring: Pointer to driver SLI ring object.
+ *
+ * This function is called with hbalock held and the caller must post the
+ * iocb without releasing the lock. If the caller releases the lock,
+ * iocb slot returned by the function is not guaranteed to be available.
+ * The function returns pointer to the next available iocb slot if there
+ * is available slot in the ring, else it returns NULL.
+ * If the get index of the ring is ahead of the put index, the function
+ * will post an error attention event to the worker thread to take the
+ * HBA to offline state.
+ **/
 static IOCB_t *
 lpfc_sli_next_iocb_slot (struct lpfc_hba *phba, struct lpfc_sli_ring *pring)
 {
-        struct lpfc_pgp *pgp = (phba->sli_rev == 3) ?
-                &phba->slim2p->mbx.us.s3_pgp.port[pring->ringno] :
-                &phba->slim2p->mbx.us.s2.port[pring->ringno];
+        struct lpfc_pgp *pgp = &phba->port_gp[pring->ringno];
         uint32_t  max_cmd_idx = pring->numCiocb;
-
         if ((pring->next_cmdidx == pring->cmdidx) &&
            (++pring->next_cmdidx >= max_cmd_idx))
                 pring->next_cmdidx = 0;
@@ -336,6 +444,18 @@ lpfc_sli_next_iocb_slot (struct lpfc_hba *phba, struct lpfc_sli_ring *pring)
         return lpfc_cmd_iocb(phba, pring);
 }
 
+/**
+ * lpfc_sli_next_iotag: Get an iotag for the iocb.
+ * @phba: Pointer to HBA context object.
+ * @iocbq: Pointer to driver iocb object.
+ *
+ * This function gets an iotag for the iocb. If there is no unused iotag and
+ * the iocbq_lookup_len < 0xffff, this function allocates a bigger iotag_lookup
+ * array and assigns a new iotag.
+ * The function returns the allocated iotag if successful, else returns zero.
+ * Zero is not a valid iotag.
+ * The caller is not required to hold any lock.
+ **/
 uint16_t
 lpfc_sli_next_iotag(struct lpfc_hba *phba, struct lpfc_iocbq *iocbq)
 {
@@ -399,6 +519,20 @@ lpfc_sli_next_iotag(struct lpfc_hba *phba, struct lpfc_iocbq *iocbq)
         return 0;
 }
 
+/**
+ * lpfc_sli_submit_iocb: Submit an iocb to the firmware.
+ * @phba: Pointer to HBA context object.
+ * @pring: Pointer to driver SLI ring object.
+ * @iocb: Pointer to iocb slot in the ring.
+ * @nextiocb: Pointer to driver iocb object which need to be
+ *            posted to firmware.
+ *
+ * This function is called with hbalock held to post a new iocb to
+ * the firmware. This function copies the new iocb to ring iocb slot and
+ * updates the ring pointers. It adds the new iocb to txcmplq if there is
+ * a completion call back for this iocb else the function will free the
+ * iocb object.
+ **/
 static void
 lpfc_sli_submit_iocb(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                 IOCB_t *iocb, struct lpfc_iocbq *nextiocb)
@@ -441,6 +575,18 @@ lpfc_sli_submit_iocb(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
         writel(pring->cmdidx, &phba->host_gp[pring->ringno].cmdPutInx);
 }
 
+/**
+ * lpfc_sli_update_full_ring: Update the chip attention register.
+ * @phba: Pointer to HBA context object.
+ * @pring: Pointer to driver SLI ring object.
+ *
+ * The caller is not required to hold any lock for calling this function.
+ * This function updates the chip attention bits for the ring to inform firmware
+ * that there are pending work to be done for this ring and requests an
+ * interrupt when there is space available in the ring. This function is
+ * called when the driver is unable to post more iocbs to the ring due
+ * to unavailability of space in the ring.
+ **/
 static void
 lpfc_sli_update_full_ring(struct lpfc_hba *phba, struct lpfc_sli_ring *pring)
 {
@@ -460,6 +606,15 @@ lpfc_sli_update_full_ring(struct lpfc_hba *phba, struct lpfc_sli_ring *pring)
         pring->stats.iocb_cmd_full++;
 }
 
+/**
+ * lpfc_sli_update_ring: Update chip attention register.
+ * @phba: Pointer to HBA context object.
+ * @pring: Pointer to driver SLI ring object.
+ *
+ * This function updates the chip attention register bit for the
+ * given ring to inform HBA that there is more work to be done
+ * in this ring. The caller is not required to hold any lock.
+ **/
 static void
 lpfc_sli_update_ring(struct lpfc_hba *phba, struct lpfc_sli_ring *pring)
 {
@@ -468,11 +623,22 @@ lpfc_sli_update_ring(struct lpfc_hba *phba, struct lpfc_sli_ring *pring)
         /*
          * Tell the HBA that there is work to do in this ring.
          */
-        wmb();
-        writel(CA_R0ATT << (ringno * 4), phba->CAregaddr);
-        readl(phba->CAregaddr); /* flush */
+        if (!(phba->sli3_options & LPFC_SLI3_CRP_ENABLED)) {
+                wmb();
+                writel(CA_R0ATT << (ringno * 4), phba->CAregaddr);
+                readl(phba->CAregaddr); /* flush */
+        }
 }
 
+/**
+ * lpfc_sli_resume_iocb: Process iocbs in the txq.
+ * @phba: Pointer to HBA context object.
+ * @pring: Pointer to driver SLI ring object.
+ *
+ * This function is called with hbalock held to post pending iocbs
+ * in the txq to the firmware. This function is called when driver
+ * detects space available in the ring.
+ **/
 static void
 lpfc_sli_resume_iocb(struct lpfc_hba *phba, struct lpfc_sli_ring *pring)
 {
@@ -504,6 +670,16 @@ lpfc_sli_resume_iocb(struct lpfc_hba *phba, struct lpfc_sli_ring *pring)
         return;
 }
 
+/**
+ * lpfc_sli_next_hbq_slot: Get next hbq entry for the HBQ.
+ * @phba: Pointer to HBA context object.
+ * @hbqno: HBQ number.
+ *
+ * This function is called with hbalock held to get the next
+ * available slot for the given HBQ. If there is free slot
+ * available for the HBQ it will return pointer to the next available
+ * HBQ entry else it will return NULL.
+ **/
 static struct lpfc_hbq_entry *
 lpfc_sli_next_hbq_slot(struct lpfc_hba *phba, uint32_t hbqno)
 {
@@ -539,6 +715,15 @@ lpfc_sli_next_hbq_slot(struct lpfc_hba *phba, uint32_t hbqno)
                         hbqp->hbqPutIdx;
 }
 
+/**
+ * lpfc_sli_hbqbuf_free_all: Free all the hbq buffers.
+ * @phba: Pointer to HBA context object.
+ *
+ * This function is called with no lock held to free all the
+ * hbq buffers while uninitializing the SLI interface. It also
+ * frees the HBQ buffers returned by the firmware but not yet
+ * processed by the upper layers.
+ **/
 void
 lpfc_sli_hbqbuf_free_all(struct lpfc_hba *phba)
 {
@@ -584,6 +769,18 @@ lpfc_sli_hbqbuf_free_all(struct lpfc_hba *phba)
         spin_unlock_irqrestore(&phba->hbalock, flags);
 }
 
+/**
+ * lpfc_sli_hbq_to_firmware: Post the hbq buffer to firmware.
+ * @phba: Pointer to HBA context object.
+ * @hbqno: HBQ number.
+ * @hbq_buf: Pointer to HBQ buffer.
+ *
+ * This function is called with the hbalock held to post a
+ * hbq buffer to the firmware. If the function finds an empty
+ * slot in the HBQ, it will post the buffer. The function will return
+ * pointer to the hbq entry if it successfully post the buffer
+ * else it will return NULL.
+ **/
 static struct lpfc_hbq_entry *
 lpfc_sli_hbq_to_firmware(struct lpfc_hba *phba, uint32_t hbqno,
                          struct hbq_dmabuf *hbq_buf)
@@ -612,6 +809,7 @@ lpfc_sli_hbq_to_firmware(struct lpfc_hba *phba, uint32_t hbqno,
         return hbqe;
 }
 
+/* HBQ for ELS and CT traffic. */
 static struct lpfc_hbq_init lpfc_els_hbq = {
         .rn = 1,
         .entry_count = 200,
@@ -623,6 +821,7 @@ static struct lpfc_hbq_init lpfc_els_hbq = {
         .add_count = 5,
 };
 
+/* HBQ for the extra ring if needed */
 static struct lpfc_hbq_init lpfc_extra_hbq = {
         .rn = 1,
         .entry_count = 200,
@@ -634,51 +833,81 @@ static struct lpfc_hbq_init lpfc_extra_hbq = {
         .add_count = 5,
 };
 
+/* Array of HBQs */
 struct lpfc_hbq_init *lpfc_hbq_defs[] = {
         &lpfc_els_hbq,
         &lpfc_extra_hbq,
 };
 
+/**
+ * lpfc_sli_hbqbuf_fill_hbqs: Post more hbq buffers to HBQ.
+ * @phba: Pointer to HBA context object.
+ * @hbqno: HBQ number.
+ * @count: Number of HBQ buffers to be posted.
+ *
+ * This function is called with no lock held to post more hbq buffers to the
+ * given HBQ. The function returns the number of HBQ buffers successfully
+ * posted.
+ **/
 static int
 lpfc_sli_hbqbuf_fill_hbqs(struct lpfc_hba *phba, uint32_t hbqno, uint32_t count)
 {
-        uint32_t i, start, end;
+        uint32_t i, posted = 0;
         unsigned long flags;
         struct hbq_dmabuf *hbq_buffer;
-
+        LIST_HEAD(hbq_buf_list);
         if (!phba->hbqs[hbqno].hbq_alloc_buffer)
                 return 0;
 
-        start = phba->hbqs[hbqno].buffer_count;
-        end = count + start;
-        if (end > lpfc_hbq_defs[hbqno]->entry_count)
-                end = lpfc_hbq_defs[hbqno]->entry_count;
-
+        if ((phba->hbqs[hbqno].buffer_count + count) >
+            lpfc_hbq_defs[hbqno]->entry_count)
+                count = lpfc_hbq_defs[hbqno]->entry_count -
+                                        phba->hbqs[hbqno].buffer_count;
+        if (!count)
+                return 0;
+        /* Allocate HBQ entries */
+        for (i = 0; i < count; i++) {
+                hbq_buffer = (phba->hbqs[hbqno].hbq_alloc_buffer)(phba);
+                if (!hbq_buffer)
+                        break;
+                list_add_tail(&hbq_buffer->dbuf.list, &hbq_buf_list);
+        }
         /* Check whether HBQ is still in use */
         spin_lock_irqsave(&phba->hbalock, flags);
         if (!phba->hbq_in_use)
-                goto out;
-
-        /* Populate HBQ entries */
-        for (i = start; i < end; i++) {
-                hbq_buffer = (phba->hbqs[hbqno].hbq_alloc_buffer)(phba);
-                if (!hbq_buffer)
-                        goto err;
-                hbq_buffer->tag = (i | (hbqno << 16));
-                if (lpfc_sli_hbq_to_firmware(phba, hbqno, hbq_buffer))
+                goto err;
+        while (!list_empty(&hbq_buf_list)) {
+                list_remove_head(&hbq_buf_list, hbq_buffer, struct hbq_dmabuf,
+                                 dbuf.list);
+                hbq_buffer->tag = (phba->hbqs[hbqno].buffer_count |
+                                      (hbqno << 16));
+                if (lpfc_sli_hbq_to_firmware(phba, hbqno, hbq_buffer)) {
                         phba->hbqs[hbqno].buffer_count++;
-                else
+                        posted++;
+                } else
                         (phba->hbqs[hbqno].hbq_free_buffer)(phba, hbq_buffer);
         }
-
- out:
         spin_unlock_irqrestore(&phba->hbalock, flags);
-        return 0;
- err:
+        return posted;
+err:
         spin_unlock_irqrestore(&phba->hbalock, flags);
-        return 1;
+        while (!list_empty(&hbq_buf_list)) {
+                list_remove_head(&hbq_buf_list, hbq_buffer, struct hbq_dmabuf,
+                                 dbuf.list);
+                (phba->hbqs[hbqno].hbq_free_buffer)(phba, hbq_buffer);
+        }
+        return 0;
 }
 
+/**
+ * lpfc_sli_hbqbuf_add_hbqs: Post more HBQ buffers to firmware.
+ * @phba: Pointer to HBA context object.
+ * @qno: HBQ number.
+ *
+ * This function posts more buffers to the HBQ. This function
+ * is called with no lock held. The function returns the number of HBQ entries
+ * successfully allocated.
+ **/
 int
 lpfc_sli_hbqbuf_add_hbqs(struct lpfc_hba *phba, uint32_t qno)
 {
@@ -686,6 +915,15 @@ lpfc_sli_hbqbuf_add_hbqs(struct lpfc_hba *phba, uint32_t qno)
                                          lpfc_hbq_defs[qno]->add_count));
 }
 
+/**
+ * lpfc_sli_hbqbuf_init_hbqs: Post initial buffers to the HBQ.
+ * @phba: Pointer to HBA context object.
+ * @qno:  HBQ queue number.
+ *
+ * This function is called from SLI initialization code path with
+ * no lock held to post initial HBQ buffers to firmware. The
+ * function returns the number of HBQ entries successfully allocated.
+ **/
 static int
 lpfc_sli_hbqbuf_init_hbqs(struct lpfc_hba *phba, uint32_t qno)
 {
@@ -693,6 +931,16 @@ lpfc_sli_hbqbuf_init_hbqs(struct lpfc_hba *phba, uint32_t qno)
                                          lpfc_hbq_defs[qno]->init_count));
 }
 
+/**
+ * lpfc_sli_hbqbuf_find: Find the hbq buffer associated with a tag.
+ * @phba: Pointer to HBA context object.
+ * @tag: Tag of the hbq buffer.
+ *
+ * This function is called with hbalock held. This function searches
+ * for the hbq buffer associated with the given tag in the hbq buffer
+ * list. If it finds the hbq buffer, it returns the hbq_buffer other wise
+ * it returns NULL.
+ **/
 static struct hbq_dmabuf *
 lpfc_sli_hbqbuf_find(struct lpfc_hba *phba, uint32_t tag)
 {
@@ -716,6 +964,15 @@ lpfc_sli_hbqbuf_find(struct lpfc_hba *phba, uint32_t tag)
         return NULL;
 }
 
+/**
+ * lpfc_sli_free_hbq: Give back the hbq buffer to firmware.
+ * @phba: Pointer to HBA context object.
+ * @hbq_buffer: Pointer to HBQ buffer.
+ *
+ * This function is called with hbalock. This function gives back
+ * the hbq buffer to firmware. If the HBQ does not have space to
+ * post the buffer, it will free the buffer.
+ **/
 void
 lpfc_sli_free_hbq(struct lpfc_hba *phba, struct hbq_dmabuf *hbq_buffer)
 {
@@ -729,6 +986,15 @@ lpfc_sli_free_hbq(struct lpfc_hba *phba, struct hbq_dmabuf *hbq_buffer)
         }
 }
 
+/**
+ * lpfc_sli_chk_mbx_command: Check if the mailbox is a legitimate mailbox.
+ * @mbxCommand: mailbox command code.
+ *
+ * This function is called by the mailbox event handler function to verify
+ * that the completed mailbox command is a legitimate mailbox command. If the
+ * completed mailbox is not known to the function, it will return MBX_SHUTDOWN
+ * and the mailbox event handler will take the HBA offline.
+ **/
 static int
 lpfc_sli_chk_mbx_command(uint8_t mbxCommand)
 {
@@ -785,6 +1051,8 @@ lpfc_sli_chk_mbx_command(uint8_t mbxCommand)
         case MBX_REG_VPI:
         case MBX_UNREG_VPI:
         case MBX_HEARTBEAT:
+        case MBX_PORT_CAPABILITIES:
+        case MBX_PORT_IOV_CONTROL:
                 ret = mbxCommand;
                 break;
         default:
@@ -793,6 +1061,19 @@ lpfc_sli_chk_mbx_command(uint8_t mbxCommand)
         }
         return ret;
 }
+
+/**
+ * lpfc_sli_wake_mbox_wait: Completion handler for mbox issued from
+ *          lpfc_sli_issue_mbox_wait.
+ * @phba: Pointer to HBA context object.
+ * @pmboxq: Pointer to mailbox command.
+ *
+ * This is completion handler function for mailbox commands issued from
+ * lpfc_sli_issue_mbox_wait function. This function is called by the
+ * mailbox event handler function with no lock held. This function
+ * will wake up thread waiting on the wait queue pointed by context1
+ * of the mailbox.
+ **/
 static void
 lpfc_sli_wake_mbox_wait(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmboxq)
 {
@@ -812,6 +1093,17 @@ lpfc_sli_wake_mbox_wait(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmboxq)
         return;
 }
 
+
+/**
+ * lpfc_sli_def_mbox_cmpl: Default mailbox completion handler.
+ * @phba: Pointer to HBA context object.
+ * @pmb: Pointer to mailbox object.
+ *
+ * This function is the default mailbox completion handler. It
+ * frees the memory resources associated with the completed mailbox
+ * command. If the completed command is a REG_LOGIN mailbox command,
+ * this function will issue a UREG_LOGIN to re-claim the RPI.
+ **/
 void
 lpfc_sli_def_mbox_cmpl(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
 {
@@ -846,6 +1138,19 @@ lpfc_sli_def_mbox_cmpl(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
         return;
 }
 
+/**
+ * lpfc_sli_handle_mb_event: Handle mailbox completions from firmware.
+ * @phba: Pointer to HBA context object.
+ *
+ * This function is called with no lock held. This function processes all
+ * the completed mailbox commands and gives it to upper layers. The interrupt
+ * service routine processes mailbox completion interrupt and adds completed
+ * mailbox commands to the mboxq_cmpl queue and signals the worker thread.
+ * Worker thread call lpfc_sli_handle_mb_event, which will return the
+ * completed mailbox commands in mboxq_cmpl queue to the upper layers. This
+ * function returns the mailbox commands to the upper layer by calling the
+ * completion handler function of each mailbox.
+ **/
 int
 lpfc_sli_handle_mb_event(struct lpfc_hba *phba)
 {
@@ -953,6 +1258,18 @@ lpfc_sli_handle_mb_event(struct lpfc_hba *phba)
         return 0;
 }
 
+/**
+ * lpfc_sli_replace_hbqbuff: Replace the HBQ buffer with a new buffer.
+ * @phba: Pointer to HBA context object.
+ * @tag: Tag for the HBQ buffer.
+ *
+ * This function is called from unsolicited event handler code path to get the
+ * HBQ buffer associated with an unsolicited iocb. This function is called with
+ * no lock held. It returns the buffer associated with the given tag and posts
+ * another buffer to the firmware. Note that the new buffer must be allocated
+ * before taking the hbalock and that the hba lock must be held until it is
+ * finished with the hbq entry swap.
+ **/
 static struct lpfc_dmabuf *
 lpfc_sli_replace_hbqbuff(struct lpfc_hba *phba, uint32_t tag)
 {
@@ -962,22 +1279,28 @@ lpfc_sli_replace_hbqbuff(struct lpfc_hba *phba, uint32_t tag)
         dma_addr_t phys;        /* mapped address */
         unsigned long flags;
 
+        hbqno = tag >> 16;
+        new_hbq_entry = (phba->hbqs[hbqno].hbq_alloc_buffer)(phba);
         /* Check whether HBQ is still in use */
         spin_lock_irqsave(&phba->hbalock, flags);
         if (!phba->hbq_in_use) {
+                if (new_hbq_entry)
+                        (phba->hbqs[hbqno].hbq_free_buffer)(phba,
+                                                            new_hbq_entry);
                 spin_unlock_irqrestore(&phba->hbalock, flags);
                 return NULL;
         }
 
         hbq_entry = lpfc_sli_hbqbuf_find(phba, tag);
         if (hbq_entry == NULL) {
+                if (new_hbq_entry)
+                        (phba->hbqs[hbqno].hbq_free_buffer)(phba,
+                                                            new_hbq_entry);
                 spin_unlock_irqrestore(&phba->hbalock, flags);
                 return NULL;
         }
         list_del(&hbq_entry->dbuf.list);
 
-        hbqno = tag >> 16;
-        new_hbq_entry = (phba->hbqs[hbqno].hbq_alloc_buffer)(phba);
         if (new_hbq_entry == NULL) {
                 list_add_tail(&hbq_entry->dbuf.list, &phba->hbqbuf_in_list);
                 spin_unlock_irqrestore(&phba->hbalock, flags);
@@ -997,6 +1320,18 @@ lpfc_sli_replace_hbqbuff(struct lpfc_hba *phba, uint32_t tag)
         return &new_hbq_entry->dbuf;
 }
 
+/**
+ * lpfc_sli_get_buff: Get the buffer associated with the buffer tag.
+ * @phba: Pointer to HBA context object.
+ * @pring: Pointer to driver SLI ring object.
+ * @tag: buffer tag.
+ *
+ * This function is called with no lock held. When QUE_BUFTAG_BIT bit
+ * is set in the tag the buffer is posted for a particular exchange,
+ * the function will return the buffer without replacing the buffer.
+ * If the buffer is for unsolicited ELS or CT traffic, this function
+ * returns the buffer and also posts another buffer to the firmware.
+ **/
 static struct lpfc_dmabuf *
 lpfc_sli_get_buff(struct lpfc_hba *phba,
                         struct lpfc_sli_ring *pring,
@@ -1008,6 +1343,21 @@ lpfc_sli_get_buff(struct lpfc_hba *phba,
                 return lpfc_sli_replace_hbqbuff(phba, tag);
 }
 
+
+/**
+ * lpfc_sli_process_unsol_iocb: Unsolicited iocb handler.
+ * @phba: Pointer to HBA context object.
+ * @pring: Pointer to driver SLI ring object.
+ * @saveq: Pointer to the unsolicited iocb.
+ *
+ * This function is called with no lock held by the ring event handler
+ * when there is an unsolicited iocb posted to the response ring by the
+ * firmware. This function gets the buffer associated with the iocbs
+ * and calls the event handler for the ring. This function handles both
+ * qring buffers and hbq buffers.
+ * When the function returns 1 the caller can free the iocb object otherwise
+ * upper layer functions will free the iocb objects.
+ **/
 static int
 lpfc_sli_process_unsol_iocb(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                             struct lpfc_iocbq *saveq)
@@ -1192,6 +1542,18 @@ lpfc_sli_process_unsol_iocb(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
         return 1;
 }
 
+/**
+ * lpfc_sli_iocbq_lookup: Find command iocb for the given response iocb.
+ * @phba: Pointer to HBA context object.
+ * @pring: Pointer to driver SLI ring object.
+ * @prspiocb: Pointer to response iocb object.
+ *
+ * This function looks up the iocb_lookup table to get the command iocb
+ * corresponding to the given response iocb using the iotag of the
+ * response iocb. This function is called with the hbalock held.
+ * This function returns the command iocb object if it finds the command
+ * iocb else returns NULL.
+ **/
 static struct lpfc_iocbq *
 lpfc_sli_iocbq_lookup(struct lpfc_hba *phba,
                       struct lpfc_sli_ring *pring,
@@ -1217,6 +1579,23 @@ lpfc_sli_iocbq_lookup(struct lpfc_hba *phba,
         return NULL;
 }
 
+/**
+ * lpfc_sli_process_sol_iocb: process solicited iocb completion.
+ * @phba: Pointer to HBA context object.
+ * @pring: Pointer to driver SLI ring object.
+ * @saveq: Pointer to the response iocb to be processed.
+ *
+ * This function is called by the ring event handler for non-fcp
+ * rings when there is a new response iocb in the response ring.
+ * The caller is not required to hold any locks. This function
+ * gets the command iocb associated with the response iocb and
+ * calls the completion handler for the command iocb. If there
+ * is no completion handler, the function will free the resources
+ * associated with command iocb. If the response iocb is for
+ * an already aborted command iocb, the status of the completion
+ * is changed to IOSTAT_LOCAL_REJECT/IOERR_SLI_ABORTED.
+ * This function always returns 1.
+ **/
 static int
 lpfc_sli_process_sol_iocb(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                           struct lpfc_iocbq *saveq)
@@ -1233,6 +1612,17 @@ lpfc_sli_process_sol_iocb(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
         if (cmdiocbp) {
                 if (cmdiocbp->iocb_cmpl) {
                         /*
+                         * If an ELS command failed send an event to mgmt
+                         * application.
+                         */
+                        if (saveq->iocb.ulpStatus &&
+                             (pring->ringno == LPFC_ELS_RING) &&
+                             (cmdiocbp->iocb.ulpCommand ==
+                                CMD_ELS_REQUEST64_CR))
+                                lpfc_send_els_failure_event(phba,
+                                        cmdiocbp, saveq);
+
+                        /*
                          * Post all ELS completions to the worker thread.
                          * All other are passed to the completion callback.
                          */
@@ -1282,12 +1672,20 @@ lpfc_sli_process_sol_iocb(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
         return rc;
 }
 
+/**
+ * lpfc_sli_rsp_pointers_error: Response ring pointer error handler.
+ * @phba: Pointer to HBA context object.
+ * @pring: Pointer to driver SLI ring object.
+ *
+ * This function is called from the iocb ring event handlers when
+ * put pointer is ahead of the get pointer for a ring. This function signal
+ * an error attention condition to the worker thread and the worker
+ * thread will transition the HBA to offline state.
+ **/
 static void
 lpfc_sli_rsp_pointers_error(struct lpfc_hba *phba, struct lpfc_sli_ring *pring)
 {
-        struct lpfc_pgp *pgp = (phba->sli_rev == 3) ?
-                &phba->slim2p->mbx.us.s3_pgp.port[pring->ringno] :
-                &phba->slim2p->mbx.us.s2.port[pring->ringno];
+        struct lpfc_pgp *pgp = &phba->port_gp[pring->ringno];
         /*
          * Ring <ringno> handler: portRspPut <portRspPut> is bigger then
          * rsp ring <portRspMax>
@@ -1312,6 +1710,51 @@ lpfc_sli_rsp_pointers_error(struct lpfc_hba *phba, struct lpfc_sli_ring *pring)
         return;
 }
 
+/**
+ * lpfc_poll_eratt: Error attention polling timer timeout handler.
+ * @ptr: Pointer to address of HBA context object.
+ *
+ * This function is invoked by the Error Attention polling timer when the
+ * timer times out. It will check the SLI Error Attention register for
+ * possible attention events. If so, it will post an Error Attention event
+ * and wake up worker thread to process it. Otherwise, it will set up the
+ * Error Attention polling timer for the next poll.
+ **/
+void lpfc_poll_eratt(unsigned long ptr)
+{
+        struct lpfc_hba *phba;
+        uint32_t eratt = 0;
+
+        phba = (struct lpfc_hba *)ptr;
+
+        /* Check chip HA register for error event */
+        eratt = lpfc_sli_check_eratt(phba);
+
+        if (eratt)
+                /* Tell the worker thread there is work to do */
+                lpfc_worker_wake_up(phba);
+        else
+                /* Restart the timer for next eratt poll */
+                mod_timer(&phba->eratt_poll, jiffies +
+                                        HZ * LPFC_ERATT_POLL_INTERVAL);
+        return;
+}
+
+/**
+ * lpfc_sli_poll_fcp_ring: Handle FCP ring completion in polling mode.
+ * @phba: Pointer to HBA context object.
+ *
+ * This function is called from lpfc_queuecommand, lpfc_poll_timeout,
+ * lpfc_abort_handler and lpfc_slave_configure when FCP_RING_POLLING
+ * is enabled.
+ *
+ * The caller does not hold any lock.
+ * The function processes each response iocb in the response ring until it
+ * finds an iocb with LE bit set and chains all the iocbs upto the iocb with
+ * LE bit set. The function will call the completion handler of the command iocb
+ * if the response iocb indicates a completion for a command iocb or it is
+ * an abort completion.
+ **/
 void lpfc_sli_poll_fcp_ring(struct lpfc_hba *phba)
 {
         struct lpfc_sli      *psli  = &phba->sli;
@@ -1320,7 +1763,7 @@ void lpfc_sli_poll_fcp_ring(struct lpfc_hba *phba)
         IOCB_t *entry = NULL;
         struct lpfc_iocbq *cmdiocbq = NULL;
         struct lpfc_iocbq rspiocbq;
-        struct lpfc_pgp *pgp;
+        struct lpfc_pgp *pgp = &phba->port_gp[pring->ringno];
         uint32_t status;
         uint32_t portRspPut, portRspMax;
         int type;
@@ -1330,11 +1773,6 @@ void lpfc_sli_poll_fcp_ring(struct lpfc_hba *phba)
 
         pring->stats.iocb_event++;
 
-        pgp = (phba->sli_rev == 3) ?
-                &phba->slim2p->mbx.us.s3_pgp.port[pring->ringno] :
-                &phba->slim2p->mbx.us.s2.port[pring->ringno];
-
-
         /*
          * The next available response entry should never exceed the maximum
          * entries.  If it does, treat it as an adapter hardware error.
@@ -1372,8 +1810,8 @@ void lpfc_sli_poll_fcp_ring(struct lpfc_hba *phba)
                                         irsp->un.ulpWord[3],
                                         irsp->un.ulpWord[4],
                                         irsp->un.ulpWord[5],
-                                        *(((uint32_t *) irsp) + 6),
-                                        *(((uint32_t *) irsp) + 7));
+                                        *(uint32_t *)&irsp->un1,
+                                        *((uint32_t *)&irsp->un1 + 1));
                 }
 
                 switch (type) {
@@ -1465,17 +1903,28 @@ void lpfc_sli_poll_fcp_ring(struct lpfc_hba *phba)
         return;
 }
 
-/*
+/**
+ * lpfc_sli_handle_fast_ring_event: Handle ring events on FCP ring.
+ * @phba: Pointer to HBA context object.
+ * @pring: Pointer to driver SLI ring object.
+ * @mask: Host attention register mask for this ring.
+ *
+ * This function is called from the interrupt context when there is a ring
+ * event for the fcp ring. The caller does not hold any lock.
+ * The function processes each response iocb in the response ring until it
+ * finds an iocb with LE bit set and chains all the iocbs upto the iocb with
+ * LE bit set. The function will call the completion handler of the command iocb
+ * if the response iocb indicates a completion for a command iocb or it is
+ * an abort completion. The function will call lpfc_sli_process_unsol_iocb
+ * function if this is an unsolicited iocb.
  * This routine presumes LPFC_FCP_RING handling and doesn't bother
- * to check it explicitly.
- */
+ * to check it explicitly. This function always returns 1.
+ **/
 static int
 lpfc_sli_handle_fast_ring_event(struct lpfc_hba *phba,
                                 struct lpfc_sli_ring *pring, uint32_t mask)
 {
-        struct lpfc_pgp *pgp = (phba->sli_rev == 3) ?
-                &phba->slim2p->mbx.us.s3_pgp.port[pring->ringno] :
-                &phba->slim2p->mbx.us.s2.port[pring->ringno];
+        struct lpfc_pgp *pgp = &phba->port_gp[pring->ringno];
         IOCB_t *irsp = NULL;
         IOCB_t *entry = NULL;
         struct lpfc_iocbq *cmdiocbq = NULL;
@@ -1548,8 +1997,8 @@ lpfc_sli_handle_fast_ring_event(struct lpfc_hba *phba,
                                         irsp->un.ulpWord[3],
                                         irsp->un.ulpWord[4],
                                         irsp->un.ulpWord[5],
-                                        *(((uint32_t *) irsp) + 6),
-                                        *(((uint32_t *) irsp) + 7));
+                                        *(uint32_t *)&irsp->un1,
+                                        *((uint32_t *)&irsp->un1 + 1));
                 }
 
                 switch (type) {
@@ -1646,13 +2095,28 @@ lpfc_sli_handle_fast_ring_event(struct lpfc_hba *phba,
         return rc;
 }
 
+/**
+ * lpfc_sli_handle_slow_ring_event: Handle ring events for non-FCP rings.
+ * @phba: Pointer to HBA context object.
+ * @pring: Pointer to driver SLI ring object.
+ * @mask: Host attention register mask for this ring.
+ *
+ * This function is called from the worker thread when there is a ring
+ * event for non-fcp rings. The caller does not hold any lock .
+ * The function processes each response iocb in the response ring until it
+ * finds an iocb with LE bit set and chains all the iocbs upto the iocb with
+ * LE bit set. The function will call lpfc_sli_process_sol_iocb function if the
+ * response iocb indicates a completion of a command iocb. The function
+ * will call lpfc_sli_process_unsol_iocb function if this is an unsolicited
+ * iocb. The function frees the resources or calls the completion handler if
+ * this iocb is an abort completion. The function returns 0 when the allocated
+ * iocbs are not freed, otherwise returns 1.
+ **/
 int
 lpfc_sli_handle_slow_ring_event(struct lpfc_hba *phba,
                                 struct lpfc_sli_ring *pring, uint32_t mask)
 {
-        struct lpfc_pgp *pgp = (phba->sli_rev == 3) ?
-                &phba->slim2p->mbx.us.s3_pgp.port[pring->ringno] :
-                &phba->slim2p->mbx.us.s2.port[pring->ringno];
+        struct lpfc_pgp *pgp;
         IOCB_t *entry;
         IOCB_t *irsp = NULL;
         struct lpfc_iocbq *rspiocbp = NULL;
@@ -1666,6 +2130,7 @@ lpfc_sli_handle_slow_ring_event(struct lpfc_hba *phba,
         int rc = 1;
         unsigned long iflag;
 
+        pgp = &phba->port_gp[pring->ringno];
         spin_lock_irqsave(&phba->hbalock, iflag);
         pring->stats.iocb_event++;
 
@@ -1904,6 +2369,16 @@ lpfc_sli_handle_slow_ring_event(struct lpfc_hba *phba,
         return rc;
 }
 
+/**
+ * lpfc_sli_abort_iocb_ring: Abort all iocbs in the ring.
+ * @phba: Pointer to HBA context object.
+ * @pring: Pointer to driver SLI ring object.
+ *
+ * This function aborts all iocbs in the given ring and frees all the iocb
+ * objects in txq. This function issues an abort iocb for all the iocb commands
+ * in txcmplq. The iocbs in the txcmplq is not guaranteed to complete before
+ * the return of this function. The caller is not required to hold any locks.
+ **/
 void
 lpfc_sli_abort_iocb_ring(struct lpfc_hba *phba, struct lpfc_sli_ring *pring)
 {
@@ -1943,6 +2418,83 @@ lpfc_sli_abort_iocb_ring(struct lpfc_hba *phba, struct lpfc_sli_ring *pring)
         }
 }
 
+/**
+ * lpfc_sli_flush_fcp_rings: flush all iocbs in the fcp ring.
+ * @phba: Pointer to HBA context object.
+ *
+ * This function flushes all iocbs in the fcp ring and frees all the iocb
+ * objects in txq and txcmplq. This function will not issue abort iocbs
+ * for all the iocb commands in txcmplq, they will just be returned with
+ * IOERR_SLI_DOWN. This function is invoked with EEH when device's PCI
+ * slot has been permanently disabled.
+ **/
+void
+lpfc_sli_flush_fcp_rings(struct lpfc_hba *phba)
+{
+        LIST_HEAD(txq);
+        LIST_HEAD(txcmplq);
+        struct lpfc_iocbq *iocb;
+        IOCB_t *cmd = NULL;
+        struct lpfc_sli *psli = &phba->sli;
+        struct lpfc_sli_ring  *pring;
+
+        /* Currently, only one fcp ring */
+        pring = &psli->ring[psli->fcp_ring];
+
+        spin_lock_irq(&phba->hbalock);
+        /* Retrieve everything on txq */
+        list_splice_init(&pring->txq, &txq);
+        pring->txq_cnt = 0;
+
+        /* Retrieve everything on the txcmplq */
+        list_splice_init(&pring->txcmplq, &txcmplq);
+        pring->txcmplq_cnt = 0;
+        spin_unlock_irq(&phba->hbalock);
+
+        /* Flush the txq */
+        while (!list_empty(&txq)) {
+                iocb = list_get_first(&txq, struct lpfc_iocbq, list);
+                cmd = &iocb->iocb;
+                list_del_init(&iocb->list);
+
+                if (!iocb->iocb_cmpl)
+                        lpfc_sli_release_iocbq(phba, iocb);
+                else {
+                        cmd->ulpStatus = IOSTAT_LOCAL_REJECT;
+                        cmd->un.ulpWord[4] = IOERR_SLI_DOWN;
+                        (iocb->iocb_cmpl) (phba, iocb, iocb);
+                }
+        }
+
+        /* Flush the txcmpq */
+        while (!list_empty(&txcmplq)) {
+                iocb = list_get_first(&txcmplq, struct lpfc_iocbq, list);
+                cmd = &iocb->iocb;
+                list_del_init(&iocb->list);
+
+                if (!iocb->iocb_cmpl)
+                        lpfc_sli_release_iocbq(phba, iocb);
+                else {
+                        cmd->ulpStatus = IOSTAT_LOCAL_REJECT;
+                        cmd->un.ulpWord[4] = IOERR_SLI_DOWN;
+                        (iocb->iocb_cmpl) (phba, iocb, iocb);
+                }
+        }
+}
+
+/**
+ * lpfc_sli_brdready: Check for host status bits.
+ * @phba: Pointer to HBA context object.
+ * @mask: Bit mask to be checked.
+ *
+ * This function reads the host status register and compares
+ * with the provided bit mask to check if HBA completed
+ * the restart. This function will wait in a loop for the
+ * HBA to complete restart. If the HBA does not restart within
+ * 15 iterations, the function will reset the HBA again. The
+ * function returns 1 when HBA fail to restart otherwise returns
+ * zero.
+ **/
 int
 lpfc_sli_brdready(struct lpfc_hba *phba, uint32_t mask)
 {
@@ -1990,6 +2542,13 @@ lpfc_sli_brdready(struct lpfc_hba *phba, uint32_t mask)
 
 #define BARRIER_TEST_PATTERN (0xdeadbeef)
 
+/**
+ * lpfc_reset_barrier: Make HBA ready for HBA reset.
+ * @phba: Pointer to HBA context object.
+ *
+ * This function is called before resetting an HBA. This
+ * function requests HBA to quiesce DMAs before a reset.
+ **/
 void lpfc_reset_barrier(struct lpfc_hba *phba)
 {
         uint32_t __iomem *resp_buf;
@@ -2063,6 +2622,17 @@ restore_hc:
         readl(phba->HCregaddr); /* flush */
 }
 
+/**
+ * lpfc_sli_brdkill: Issue a kill_board mailbox command.
+ * @phba: Pointer to HBA context object.
+ *
+ * This function issues a kill_board mailbox command and waits for
+ * the error attention interrupt. This function is called for stopping
+ * the firmware processing. The caller is not required to hold any
+ * locks. This function calls lpfc_hba_down_post function to free
+ * any pending commands after the kill. The function will return 1 when it
+ * fails to kill the board else will return 0.
+ **/
 int
 lpfc_sli_brdkill(struct lpfc_hba *phba)
 {
@@ -2139,6 +2709,17 @@ lpfc_sli_brdkill(struct lpfc_hba *phba)
         return ha_copy & HA_ERATT ? 0 : 1;
 }
 
+/**
+ * lpfc_sli_brdreset: Reset the HBA.
+ * @phba: Pointer to HBA context object.
+ *
+ * This function resets the HBA by writing HC_INITFF to the control
+ * register. After the HBA resets, this function resets all the iocb ring
+ * indices. This function disables PCI layer parity checking during
+ * the reset.
+ * This function returns 0 always.
+ * The caller is not required to hold any locks.
+ **/
 int
 lpfc_sli_brdreset(struct lpfc_hba *phba)
 {
@@ -2191,6 +2772,19 @@ lpfc_sli_brdreset(struct lpfc_hba *phba)
         return 0;
 }
 
+/**
+ * lpfc_sli_brdrestart: Restart the HBA.
+ * @phba: Pointer to HBA context object.
+ *
+ * This function is called in the SLI initialization code path to
+ * restart the HBA. The caller is not required to hold any lock.
+ * This function writes MBX_RESTART mailbox command to the SLIM and
+ * resets the HBA. At the end of the function, it calls lpfc_hba_down_post
+ * function to free any pending commands. The function enables
+ * POST only during the first initialization. The function returns zero.
+ * The function does not guarantee completion of MBX_RESTART mailbox
+ * command before the return of this function.
+ **/
 int
 lpfc_sli_brdrestart(struct lpfc_hba *phba)
 {
@@ -2251,6 +2845,16 @@ lpfc_sli_brdrestart(struct lpfc_hba *phba)
         return 0;
 }
 
+/**
+ * lpfc_sli_chipset_init: Wait for the restart of the HBA after a restart.
+ * @phba: Pointer to HBA context object.
+ *
+ * This function is called after a HBA restart to wait for successful
+ * restart of the HBA. Successful restart of the HBA is indicated by
+ * HS_FFRDY and HS_MBRDY bits. If the HBA fails to restart even after 15
+ * iteration, the function will restart the HBA again. The function returns
+ * zero if HBA successfully restarted else returns negative error code.
+ **/
 static int
 lpfc_sli_chipset_init(struct lpfc_hba *phba)
 {
@@ -2336,12 +2940,25 @@ lpfc_sli_chipset_init(struct lpfc_hba *phba)
         return 0;
 }
 
+/**
+ * lpfc_sli_hbq_count: Get the number of HBQs to be configured.
+ *
+ * This function calculates and returns the number of HBQs required to be
+ * configured.
+ **/
 int
 lpfc_sli_hbq_count(void)
 {
         return ARRAY_SIZE(lpfc_hbq_defs);
 }
 
+/**
+ * lpfc_sli_hbq_entry_count: Calculate total number of hbq entries.
+ *
+ * This function adds the number of hbq entries in every HBQ to get
+ * the total number of hbq entries required for the HBA and returns
+ * the total count.
+ **/
 static int
 lpfc_sli_hbq_entry_count(void)
 {
@@ -2354,12 +2971,27 @@ lpfc_sli_hbq_entry_count(void)
         return count;
 }
 
+/**
+ * lpfc_sli_hbq_size: Calculate memory required for all hbq entries.
+ *
+ * This function calculates amount of memory required for all hbq entries
+ * to be configured and returns the total memory required.
+ **/
 int
 lpfc_sli_hbq_size(void)
 {
         return lpfc_sli_hbq_entry_count() * sizeof(struct lpfc_hbq_entry);
 }
 
+/**
+ * lpfc_sli_hbq_setup: configure and initialize HBQs.
+ * @phba: Pointer to HBA context object.
+ *
+ * This function is called during the SLI initialization to configure
+ * all the HBQs and post buffers to the HBQ. The caller is not
+ * required to hold any locks. This function will return zero if successful
+ * else it will return negative error code.
+ **/
 static int
 lpfc_sli_hbq_setup(struct lpfc_hba *phba)
 {
@@ -2415,15 +3047,26 @@ lpfc_sli_hbq_setup(struct lpfc_hba *phba)
         mempool_free(pmb, phba->mbox_mem_pool);
 
         /* Initially populate or replenish the HBQs */
-        for (hbqno = 0; hbqno < hbq_count; ++hbqno) {
-                if (lpfc_sli_hbqbuf_init_hbqs(phba, hbqno))
-                        return -ENOMEM;
-        }
+        for (hbqno = 0; hbqno < hbq_count; ++hbqno)
+                lpfc_sli_hbqbuf_init_hbqs(phba, hbqno);
         return 0;
 }
 
-static int
-lpfc_do_config_port(struct lpfc_hba *phba, int sli_mode)
+/**
+ * lpfc_sli_config_port: Issue config port mailbox command.
+ * @phba: Pointer to HBA context object.
+ * @sli_mode: sli mode - 2/3
+ *
+ * This function is called by the sli intialization code path
+ * to issue config_port mailbox command. This function restarts the
+ * HBA firmware and issues a config_port mailbox command to configure
+ * the SLI interface in the sli mode specified by sli_mode
+ * variable. The caller is not required to hold any locks.
+ * The function returns 0 if successful, else returns negative error
+ * code.
+ **/
+int
+lpfc_sli_config_port(struct lpfc_hba *phba, int sli_mode)
 {
         LPFC_MBOXQ_t *pmb;
         uint32_t resetcount = 0, rc = 0, done = 0;
@@ -2460,13 +3103,15 @@ lpfc_do_config_port(struct lpfc_hba *phba, int sli_mode)
                 if (rc == -ERESTART) {
                         phba->link_state = LPFC_LINK_UNKNOWN;
                         continue;
-                } else if (rc) {
+                } else if (rc)
                         break;
-                }
-
                 phba->link_state = LPFC_INIT_MBX_CMDS;
                 lpfc_config_port(phba, pmb);
                 rc = lpfc_sli_issue_mbox(phba, pmb, MBX_POLL);
+                phba->sli3_options &= ~(LPFC_SLI3_NPIV_ENABLED |
+                                        LPFC_SLI3_HBQ_ENABLED |
+                                        LPFC_SLI3_CRP_ENABLED |
+                                        LPFC_SLI3_INB_ENABLED);
                 if (rc != MBX_SUCCESS) {
                         lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
                                 "0442 Adapter failed to init, mbxCmd x%x "
@@ -2476,30 +3121,64 @@ lpfc_do_config_port(struct lpfc_hba *phba, int sli_mode)
                         phba->sli.sli_flag &= ~LPFC_SLI2_ACTIVE;
                         spin_unlock_irq(&phba->hbalock);
                         rc = -ENXIO;
-                } else {
+                } else
                         done = 1;
-                        phba->max_vpi = (phba->max_vpi &&
-                                         pmb->mb.un.varCfgPort.gmv) != 0
-                                ? pmb->mb.un.varCfgPort.max_vpi
-                                : 0;
-                }
         }
-
         if (!done) {
                 rc = -EINVAL;
                 goto do_prep_failed;
         }
-
-        if ((pmb->mb.un.varCfgPort.sli_mode == 3) &&
-                (!pmb->mb.un.varCfgPort.cMA)) {
-                rc = -ENXIO;
+        if (pmb->mb.un.varCfgPort.sli_mode == 3) {
+                if (!pmb->mb.un.varCfgPort.cMA) {
+                        rc = -ENXIO;
+                        goto do_prep_failed;
+                }
+                if (phba->max_vpi && pmb->mb.un.varCfgPort.gmv) {
+                        phba->sli3_options |= LPFC_SLI3_NPIV_ENABLED;
+                        phba->max_vpi = pmb->mb.un.varCfgPort.max_vpi;
+                } else
+                        phba->max_vpi = 0;
+                if (pmb->mb.un.varCfgPort.gerbm)
+                        phba->sli3_options |= LPFC_SLI3_HBQ_ENABLED;
+                if (pmb->mb.un.varCfgPort.gcrp)
+                        phba->sli3_options |= LPFC_SLI3_CRP_ENABLED;
+                if (pmb->mb.un.varCfgPort.ginb) {
+                        phba->sli3_options |= LPFC_SLI3_INB_ENABLED;
+                        phba->port_gp = phba->mbox->us.s3_inb_pgp.port;
+                        phba->inb_ha_copy = &phba->mbox->us.s3_inb_pgp.ha_copy;
+                        phba->inb_counter = &phba->mbox->us.s3_inb_pgp.counter;
+                        phba->inb_last_counter =
+                                        phba->mbox->us.s3_inb_pgp.counter;
+                } else {
+                        phba->port_gp = phba->mbox->us.s3_pgp.port;
+                        phba->inb_ha_copy = NULL;
+                        phba->inb_counter = NULL;
+                }
+        } else {
+                phba->port_gp = phba->mbox->us.s2.port;
+                phba->inb_ha_copy = NULL;
+                phba->inb_counter = NULL;
+                phba->max_vpi = 0;
         }
-
 do_prep_failed:
         mempool_free(pmb, phba->mbox_mem_pool);
         return rc;
 }
 
+
+/**
+ * lpfc_sli_hba_setup: SLI intialization function.
+ * @phba: Pointer to HBA context object.
+ *
+ * This function is the main SLI intialization function. This function
+ * is called by the HBA intialization code, HBA reset code and HBA
+ * error attention handler code. Caller is not required to hold any
+ * locks. This function issues config_port mailbox command to configure
+ * the SLI, setup iocb rings and HBQ rings. In the end the function
+ * calls the config_port_post function to issue init_link mailbox
+ * command and to start the discovery. The function will return zero
+ * if successful, else it will return negative error code.
+ **/
 int
 lpfc_sli_hba_setup(struct lpfc_hba *phba)
 {
@@ -2528,22 +3207,20 @@ lpfc_sli_hba_setup(struct lpfc_hba *phba)
                 break;
         }
 
-        rc = lpfc_do_config_port(phba, mode);
+        rc = lpfc_sli_config_port(phba, mode);
+
         if (rc && lpfc_sli_mode == 3)
                 lpfc_printf_log(phba, KERN_ERR, LOG_INIT | LOG_VPORT,
                                 "1820 Unable to select SLI-3.  "
                                 "Not supported by adapter.\n");
         if (rc && mode != 2)
-                rc = lpfc_do_config_port(phba, 2);
+                rc = lpfc_sli_config_port(phba, 2);
         if (rc)
                 goto lpfc_sli_hba_setup_error;
 
         if (phba->sli_rev == 3) {
                 phba->iocb_cmd_size = SLI3_IOCB_CMD_SIZE;
                 phba->iocb_rsp_size = SLI3_IOCB_RSP_SIZE;
-                phba->sli3_options |= LPFC_SLI3_ENABLED;
-                phba->sli3_options |= LPFC_SLI3_HBQ_ENABLED;
-
         } else {
                 phba->iocb_cmd_size = SLI2_IOCB_CMD_SIZE;
                 phba->iocb_rsp_size = SLI2_IOCB_RSP_SIZE;
@@ -2558,8 +3235,7 @@ lpfc_sli_hba_setup(struct lpfc_hba *phba)
         if (rc)
                 goto lpfc_sli_hba_setup_error;
 
-                                /* Init HBQs */
-
+        /* Init HBQs */
         if (phba->sli3_options & LPFC_SLI3_HBQ_ENABLED) {
                 rc = lpfc_sli_hbq_setup(phba);
                 if (rc)
@@ -2581,19 +3257,19 @@ lpfc_sli_hba_setup_error:
         return rc;
 }
 
-/*! lpfc_mbox_timeout
- *
- * \pre
- * \post
- * \param hba Pointer to per struct lpfc_hba structure
- * \param l1  Pointer to the driver's mailbox queue.
- * \return
- *   void
- *
- * \b Description:
+
+/**
+ * lpfc_mbox_timeout: Timeout call back function for mbox timer.
+ * @ptr: context object - pointer to hba structure.
  *
- * This routine handles mailbox timeout events at timer interrupt context.
- */
+ * This is the callback function for mailbox timer. The mailbox
+ * timer is armed when a new mailbox command is issued and the timer
+ * is deleted when the mailbox complete. The function is called by
+ * the kernel timer code when a mailbox does not complete within
+ * expected time. This function wakes up the worker thread to
+ * process the mailbox timeout and returns. All the processing is
+ * done by the worker thread function lpfc_mbox_timeout_handler.
+ **/
 void
 lpfc_mbox_timeout(unsigned long ptr)
 {
@@ -2612,6 +3288,15 @@ lpfc_mbox_timeout(unsigned long ptr)
         return;
 }
 
+
+/**
+ * lpfc_mbox_timeout_handler: Worker thread function to handle mailbox timeout.
+ * @phba: Pointer to HBA context object.
+ *
+ * This function is called from worker thread when a mailbox command times out.
+ * The caller is not required to hold any locks. This function will reset the
+ * HBA and recover all the pending commands.
+ **/
 void
 lpfc_mbox_timeout_handler(struct lpfc_hba *phba)
 {
@@ -2666,6 +3351,32 @@ lpfc_mbox_timeout_handler(struct lpfc_hba *phba)
         return;
 }
 
+/**
+ * lpfc_sli_issue_mbox: Issue a mailbox command to firmware.
+ * @phba: Pointer to HBA context object.
+ * @pmbox: Pointer to mailbox object.
+ * @flag: Flag indicating how the mailbox need to be processed.
+ *
+ * This function is called by discovery code and HBA management code
+ * to submit a mailbox command to firmware. This function gets the
+ * hbalock to protect the data structures.
+ * The mailbox command can be submitted in polling mode, in which case
+ * this function will wait in a polling loop for the completion of the
+ * mailbox.
+ * If the mailbox is submitted in no_wait mode (not polling) the
+ * function will submit the command and returns immediately without waiting
+ * for the mailbox completion. The no_wait is supported only when HBA
+ * is in SLI2/SLI3 mode - interrupts are enabled.
+ * The SLI interface allows only one mailbox pending at a time. If the
+ * mailbox is issued in polling mode and there is already a mailbox
+ * pending, then the function will return an error. If the mailbox is issued
+ * in NO_WAIT mode and there is a mailbox pending already, the function
+ * will return MBX_BUSY after queuing the mailbox into mailbox queue.
+ * The sli layer owns the mailbox object until the completion of mailbox
+ * command if this function return MBX_BUSY or MBX_SUCCESS. For all other
+ * return codes the caller owns the mailbox command after the return of
+ * the function.
+ **/
 int
 lpfc_sli_issue_mbox(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmbox, uint32_t flag)
 {
@@ -2676,7 +3387,7 @@ lpfc_sli_issue_mbox(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmbox, uint32_t flag)
         int i;
         unsigned long timeout;
         unsigned long drvr_flag = 0;
-        volatile uint32_t word0, ldata;
+        uint32_t word0, ldata;
         void __iomem *to_slim;
         int processing_queue = 0;
 
@@ -2836,12 +3547,11 @@ lpfc_sli_issue_mbox(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmbox, uint32_t flag)
 
         if (psli->sli_flag & LPFC_SLI2_ACTIVE) {
                 /* First copy command data to host SLIM area */
-                lpfc_sli_pcimem_bcopy(mb, &phba->slim2p->mbx, MAILBOX_CMD_SIZE);
+                lpfc_sli_pcimem_bcopy(mb, phba->mbox, MAILBOX_CMD_SIZE);
         } else {
                 if (mb->mbxCommand == MBX_CONFIG_PORT) {
                         /* copy command data into host mbox for cmpl */
-                        lpfc_sli_pcimem_bcopy(mb, &phba->slim2p->mbx,
-                                              MAILBOX_CMD_SIZE);
+                        lpfc_sli_pcimem_bcopy(mb, phba->mbox, MAILBOX_CMD_SIZE);
                 }
 
                 /* First copy mbox command data to HBA SLIM, skip past first
@@ -2851,7 +3561,7 @@ lpfc_sli_issue_mbox(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmbox, uint32_t flag)
                             MAILBOX_CMD_SIZE - sizeof (uint32_t));
 
                 /* Next copy over first word, with mbxOwner set */
-                ldata = *((volatile uint32_t *)mb);
+                ldata = *((uint32_t *)mb);
                 to_slim = phba->MBslimaddr;
                 writel(ldata, to_slim);
                 readl(to_slim); /* flush */
@@ -2883,7 +3593,7 @@ lpfc_sli_issue_mbox(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmbox, uint32_t flag)
 
                 if (psli->sli_flag & LPFC_SLI2_ACTIVE) {
                         /* First read mbox status word */
-                        word0 = *((volatile uint32_t *)&phba->slim2p->mbx);
+                        word0 = *((uint32_t *)phba->mbox);
                         word0 = le32_to_cpu(word0);
                 } else {
                         /* First read mbox status word */
@@ -2922,12 +3632,11 @@ lpfc_sli_issue_mbox(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmbox, uint32_t flag)
 
                         if (psli->sli_flag & LPFC_SLI2_ACTIVE) {
                                 /* First copy command data */
-                                word0 = *((volatile uint32_t *)
-                                                &phba->slim2p->mbx);
+                                word0 = *((uint32_t *)phba->mbox);
                                 word0 = le32_to_cpu(word0);
                                 if (mb->mbxCommand == MBX_CONFIG_PORT) {
                                         MAILBOX_t *slimmb;
-                                        volatile uint32_t slimword0;
+                                        uint32_t slimword0;
                                         /* Check real SLIM for any errors */
                                         slimword0 = readl(phba->MBslimaddr);
                                         slimmb = (MAILBOX_t *) & slimword0;
@@ -2948,8 +3657,7 @@ lpfc_sli_issue_mbox(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmbox, uint32_t flag)
 
                 if (psli->sli_flag & LPFC_SLI2_ACTIVE) {
                         /* copy results back to user */
-                        lpfc_sli_pcimem_bcopy(&phba->slim2p->mbx, mb,
-                                              MAILBOX_CMD_SIZE);
+                        lpfc_sli_pcimem_bcopy(phba->mbox, mb, MAILBOX_CMD_SIZE);
                 } else {
                         /* First copy command data */
                         lpfc_memcpy_from_slim(mb, phba->MBslimaddr,
@@ -2980,9 +3688,16 @@ out_not_finished:
         return MBX_NOT_FINISHED;
 }
 
-/*
- * Caller needs to hold lock.
- */
+/**
+ * __lpfc_sli_ringtx_put: Add an iocb to the txq.
+ * @phba: Pointer to HBA context object.
+ * @pring: Pointer to driver SLI ring object.
+ * @piocb: Pointer to address of newly added command iocb.
+ *
+ * This function is called with hbalock held to add a command
+ * iocb to the txq when SLI layer cannot submit the command iocb
+ * to the ring.
+ **/
 static void
 __lpfc_sli_ringtx_put(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                     struct lpfc_iocbq *piocb)
@@ -2992,6 +3707,23 @@ __lpfc_sli_ringtx_put(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
         pring->txq_cnt++;
 }
 
+/**
+ * lpfc_sli_next_iocb: Get the next iocb in the txq.
+ * @phba: Pointer to HBA context object.
+ * @pring: Pointer to driver SLI ring object.
+ * @piocb: Pointer to address of newly added command iocb.
+ *
+ * This function is called with hbalock held before a new
+ * iocb is submitted to the firmware. This function checks
+ * txq to flush the iocbs in txq to Firmware before
+ * submitting new iocbs to the Firmware.
+ * If there are iocbs in the txq which need to be submitted
+ * to firmware, lpfc_sli_next_iocb returns the first element
+ * of the txq after dequeuing it from txq.
+ * If there is no iocb in the txq then the function will return
+ * *piocb and *piocb is set to NULL. Caller needs to check
+ * *piocb to find if there are more commands in the txq.
+ **/
 static struct lpfc_iocbq *
 lpfc_sli_next_iocb(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                    struct lpfc_iocbq **piocb)
@@ -3007,9 +3739,30 @@ lpfc_sli_next_iocb(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
         return nextiocb;
 }
 
-/*
- * Lockless version of lpfc_sli_issue_iocb.
- */
+/**
+ * __lpfc_sli_issue_iocb: Lockless version of lpfc_sli_issue_iocb.
+ * @phba: Pointer to HBA context object.
+ * @pring: Pointer to driver SLI ring object.
+ * @piocb: Pointer to command iocb.
+ * @flag: Flag indicating if this command can be put into txq.
+ *
+ * __lpfc_sli_issue_iocb is used by other functions in the driver
+ * to issue an iocb command to the HBA. If the PCI slot is recovering
+ * from error state or if HBA is resetting or if LPFC_STOP_IOCB_EVENT
+ * flag is turned on, the function returns IOCB_ERROR.
+ * When the link is down, this function allows only iocbs for
+ * posting buffers.
+ * This function finds next available slot in the command ring and
+ * posts the command to the available slot and writes the port
+ * attention register to request HBA start processing new iocb.
+ * If there is no slot available in the ring and
+ * flag & SLI_IOCB_RET_IOCB is set, the new iocb is added to the
+ * txq, otherwise the function returns IOCB_BUSY.
+ *
+ * This function is called with hbalock held.
+ * The function will return success after it successfully submit the
+ * iocb to firmware or after adding to the txq.
+ **/
 static int
 __lpfc_sli_issue_iocb(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                     struct lpfc_iocbq *piocb, uint32_t flag)
@@ -3052,6 +3805,16 @@ __lpfc_sli_issue_iocb(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                  * can be issued if the link is not up.
                  */
                 switch (piocb->iocb.ulpCommand) {
+                case CMD_GEN_REQUEST64_CR:
+                case CMD_GEN_REQUEST64_CX:
+                        if (!(phba->sli.sli_flag & LPFC_MENLO_MAINT) ||
+                                (piocb->iocb.un.genreq64.w5.hcsw.Rctl !=
+                                        FC_FCP_CMND) ||
+                                (piocb->iocb.un.genreq64.w5.hcsw.Type !=
+                                        MENLO_TRANSPORT_TYPE))
+
+                                goto iocb_busy;
+                        break;
                 case CMD_QUE_RING_BUF_CN:
                 case CMD_QUE_RING_BUF64_CN:
                         /*
@@ -3106,6 +3869,19 @@ __lpfc_sli_issue_iocb(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
 }
 
 
+/**
+ * lpfc_sli_issue_iocb: Wrapper function for __lpfc_sli_issue_iocb.
+ * @phba: Pointer to HBA context object.
+ * @pring: Pointer to driver SLI ring object.
+ * @piocb: Pointer to command iocb.
+ * @flag: Flag indicating if this command can be put into txq.
+ *
+ * lpfc_sli_issue_iocb is a wrapper around __lpfc_sli_issue_iocb
+ * function. This function gets the hbalock and calls
+ * __lpfc_sli_issue_iocb function and will return the error returned
+ * by __lpfc_sli_issue_iocb function. This wrapper is used by
+ * functions which do not hold hbalock.
+ **/
 int
 lpfc_sli_issue_iocb(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                     struct lpfc_iocbq *piocb, uint32_t flag)
@@ -3120,6 +3896,17 @@ lpfc_sli_issue_iocb(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
         return rc;
 }
 
+/**
+ * lpfc_extra_ring_setup: Extra ring setup function.
+ * @phba: Pointer to HBA context object.
+ *
+ * This function is called while driver attaches with the
+ * HBA to setup the extra ring. The extra ring is used
+ * only when driver needs to support target mode functionality
+ * or IP over FC functionalities.
+ *
+ * This function is called with no lock held.
+ **/
 static int
 lpfc_extra_ring_setup( struct lpfc_hba *phba)
 {
@@ -3155,6 +3942,19 @@ lpfc_extra_ring_setup( struct lpfc_hba *phba)
         return 0;
 }
 
+/**
+ * lpfc_sli_async_event_handler: ASYNC iocb handler function.
+ * @phba: Pointer to HBA context object.
+ * @pring: Pointer to driver SLI ring object.
+ * @iocbq: Pointer to iocb object.
+ *
+ * This function is called by the slow ring event handler
+ * function when there is an ASYNC event iocb in the ring.
+ * This function is called with no lock held.
+ * Currently this function handles only temperature related
+ * ASYNC events. The function decodes the temperature sensor
+ * event message and posts events for the management applications.
+ **/
 static void
 lpfc_sli_async_event_handler(struct lpfc_hba * phba,
         struct lpfc_sli_ring * pring, struct lpfc_iocbq * iocbq)
@@ -3210,6 +4010,17 @@ lpfc_sli_async_event_handler(struct lpfc_hba * phba,
 }
 
 
+/**
+ * lpfc_sli_setup: SLI ring setup function.
+ * @phba: Pointer to HBA context object.
+ *
+ * lpfc_sli_setup sets up rings of the SLI interface with
+ * number of iocbs per ring and iotags. This function is
+ * called while driver attach to the HBA and before the
+ * interrupts are enabled. So there is no need for locking.
+ *
+ * This function always returns 0.
+ **/
 int
 lpfc_sli_setup(struct lpfc_hba *phba)
 {
@@ -3321,6 +4132,17 @@ lpfc_sli_setup(struct lpfc_hba *phba)
         return 0;
 }
 
+/**
+ * lpfc_sli_queue_setup: Queue initialization function.
+ * @phba: Pointer to HBA context object.
+ *
+ * lpfc_sli_queue_setup sets up mailbox queues and iocb queues for each
+ * ring. This function also initializes ring indices of each ring.
+ * This function is called during the initialization of the SLI
+ * interface of an HBA.
+ * This function is called with no lock held and always returns
+ * 1.
+ **/
 int
 lpfc_sli_queue_setup(struct lpfc_hba *phba)
 {
@@ -3349,6 +4171,23 @@ lpfc_sli_queue_setup(struct lpfc_hba *phba)
         return 1;
 }
 
+/**
+ * lpfc_sli_host_down: Vport cleanup function.
+ * @vport: Pointer to virtual port object.
+ *
+ * lpfc_sli_host_down is called to clean up the resources
+ * associated with a vport before destroying virtual
+ * port data structures.
+ * This function does following operations:
+ * - Free discovery resources associated with this virtual
+ *   port.
+ * - Free iocbs associated with this virtual port in
+ *   the txq.
+ * - Send abort for all iocb commands associated with this
+ *   vport in txcmplq.
+ *
+ * This function is called with no lock held and always returns 1.
+ **/
 int
 lpfc_sli_host_down(struct lpfc_vport *vport)
 {
@@ -3411,6 +4250,21 @@ lpfc_sli_host_down(struct lpfc_vport *vport)
         return 1;
 }
 
+/**
+ * lpfc_sli_hba_down: Resource cleanup function for the HBA.
+ * @phba: Pointer to HBA context object.
+ *
+ * This function cleans up all iocb, buffers, mailbox commands
+ * while shutting down the HBA. This function is called with no
+ * lock held and always returns 1.
+ * This function does the following to cleanup driver resources:
+ * - Free discovery resources for each virtual port
+ * - Cleanup any pending fabric iocbs
+ * - Iterate through the iocb txq and free each entry
+ *   in the list.
+ * - Free up any buffer posted to the HBA
+ * - Free mailbox commands in the mailbox queue.
+ **/
 int
 lpfc_sli_hba_down(struct lpfc_hba *phba)
 {
@@ -3501,6 +4355,18 @@ lpfc_sli_hba_down(struct lpfc_hba *phba)
         return 1;
 }
 
+/**
+ * lpfc_sli_pcimem_bcopy: SLI memory copy function.
+ * @srcp: Source memory pointer.
+ * @destp: Destination memory pointer.
+ * @cnt: Number of words required to be copied.
+ *
+ * This function is used for copying data between driver memory
+ * and the SLI memory. This function also changes the endianness
+ * of each word if native endianness is different from SLI
+ * endianness. This function can be called with or without
+ * lock.
+ **/
 void
 lpfc_sli_pcimem_bcopy(void *srcp, void *destp, uint32_t cnt)
 {
@@ -3518,6 +4384,17 @@ lpfc_sli_pcimem_bcopy(void *srcp, void *destp, uint32_t cnt)
         }
 }
 
+
+/**
+ * lpfc_sli_ringpostbuf_put: Function to add a buffer to postbufq.
+ * @phba: Pointer to HBA context object.
+ * @pring: Pointer to driver SLI ring object.
+ * @mp: Pointer to driver buffer object.
+ *
+ * This function is called with no lock held.
+ * It always return zero after adding the buffer to the postbufq
+ * buffer list.
+ **/
 int
 lpfc_sli_ringpostbuf_put(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                          struct lpfc_dmabuf *mp)
@@ -3531,6 +4408,18 @@ lpfc_sli_ringpostbuf_put(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
         return 0;
 }
 
+/**
+ * lpfc_sli_get_buffer_tag: Tag allocation function for a buffer posted
+ *          using CMD_QUE_XRI64_CX iocb.
+ * @phba: Pointer to HBA context object.
+ *
+ * When HBQ is enabled, buffers are searched based on tags. This function
+ * allocates a tag for buffer posted using CMD_QUE_XRI64_CX iocb. The
+ * tag is bit wise or-ed with QUE_BUFTAG_BIT to make sure that the tag
+ * does not conflict with tags of buffer posted for unsolicited events.
+ * The function returns the allocated tag. The function is called with
+ * no locks held.
+ **/
 uint32_t
 lpfc_sli_get_buffer_tag(struct lpfc_hba *phba)
 {
@@ -3545,6 +4434,22 @@ lpfc_sli_get_buffer_tag(struct lpfc_hba *phba)
         return phba->buffer_tag_count;
 }
 
+/**
+ * lpfc_sli_ring_taggedbuf_get: Search HBQ buffer associated with
+ *              posted using CMD_QUE_XRI64_CX iocb.
+ * @phba: Pointer to HBA context object.
+ * @pring: Pointer to driver SLI ring object.
+ * @tag: Buffer tag.
+ *
+ * Buffers posted using CMD_QUE_XRI64_CX iocb are in pring->postbufq
+ * list. After HBA DMA data to these buffers, CMD_IOCB_RET_XRI64_CX
+ * iocb is posted to the response ring with the tag of the buffer.
+ * This function searches the pring->postbufq list using the tag
+ * to find buffer associated with CMD_IOCB_RET_XRI64_CX
+ * iocb. If the buffer is found then lpfc_dmabuf object of the
+ * buffer is returned to the caller else NULL is returned.
+ * This function is called with no lock held.
+ **/
 struct lpfc_dmabuf *
 lpfc_sli_ring_taggedbuf_get(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                         uint32_t tag)
@@ -3565,7 +4470,7 @@ lpfc_sli_ring_taggedbuf_get(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
 
         spin_unlock_irq(&phba->hbalock);
         lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
-                        "0410 Cannot find virtual addr for buffer tag on "
+                        "0402 Cannot find virtual addr for buffer tag on "
                         "ring %d Data x%lx x%p x%p x%x\n",
                         pring->ringno, (unsigned long) tag,
                         slp->next, slp->prev, pring->postbufq_cnt);
@@ -3573,6 +4478,23 @@ lpfc_sli_ring_taggedbuf_get(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
         return NULL;
 }
 
+/**
+ * lpfc_sli_ringpostbuf_get: SLI2 buffer search function for
+ *      unsolicited ct and els events.
+ * @phba: Pointer to HBA context object.
+ * @pring: Pointer to driver SLI ring object.
+ * @phys: DMA address of the buffer.
+ *
+ * This function searches the buffer list using the dma_address
+ * of unsolicited event to find the driver's lpfc_dmabuf object
+ * corresponding to the dma_address. The function returns the
+ * lpfc_dmabuf object if a buffer is found else it returns NULL.
+ * This function is called by the ct and els unsolicited event
+ * handlers to get the buffer associated with the unsolicited
+ * event.
+ *
+ * This function is called with no lock held.
+ **/
 struct lpfc_dmabuf *
 lpfc_sli_ringpostbuf_get(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                          dma_addr_t phys)
@@ -3600,6 +4522,17 @@ lpfc_sli_ringpostbuf_get(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
         return NULL;
 }
 
+/**
+ * lpfc_sli_abort_els_cmpl: Completion handler for the els abort iocbs.
+ * @phba: Pointer to HBA context object.
+ * @cmdiocb: Pointer to driver command iocb object.
+ * @rspiocb: Pointer to driver response iocb object.
+ *
+ * This function is the completion handler for the abort iocbs for
+ * ELS commands. This function is called from the ELS ring event
+ * handler with no lock held. This function frees memory resources
+ * associated with the abort iocb.
+ **/
 static void
 lpfc_sli_abort_els_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                         struct lpfc_iocbq *rspiocb)
@@ -3665,6 +4598,17 @@ lpfc_sli_abort_els_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
         return;
 }
 
+/**
+ * lpfc_ignore_els_cmpl: Completion handler for aborted ELS command.
+ * @phba: Pointer to HBA context object.
+ * @cmdiocb: Pointer to driver command iocb object.
+ * @rspiocb: Pointer to driver response iocb object.
+ *
+ * The function is called from SLI ring event handler with no
+ * lock held. This function is the completion handler for ELS commands
+ * which are aborted. The function frees memory resources used for
+ * the aborted ELS commands.
+ **/
 static void
 lpfc_ignore_els_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                      struct lpfc_iocbq *rspiocb)
@@ -3673,7 +4617,7 @@ lpfc_ignore_els_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
 
         /* ELS cmd tag <ulpIoTag> completes */
         lpfc_printf_log(phba, KERN_INFO, LOG_ELS,
-                        "0133 Ignoring ELS cmd tag x%x completion Data: "
+                        "0139 Ignoring ELS cmd tag x%x completion Data: "
                         "x%x x%x x%x\n",
                         irsp->ulpIoTag, irsp->ulpStatus,
                         irsp->un.ulpWord[4], irsp->ulpTimeout);
@@ -3684,6 +4628,17 @@ lpfc_ignore_els_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
         return;
 }
 
+/**
+ * lpfc_sli_issue_abort_iotag: Abort function for a command iocb.
+ * @phba: Pointer to HBA context object.
+ * @pring: Pointer to driver SLI ring object.
+ * @cmdiocb: Pointer to driver command iocb object.
+ *
+ * This function issues an abort iocb for the provided command
+ * iocb. This function is called with hbalock held.
+ * The function returns 0 when it fails due to memory allocation
+ * failure or when the command iocb is an abort request.
+ **/
 int
 lpfc_sli_issue_abort_iotag(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                            struct lpfc_iocbq *cmdiocb)
@@ -3748,6 +4703,8 @@ lpfc_sli_issue_abort_iotag(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                          iabt->un.acxri.abortIoTag, abtsiocbp->iotag);
         retval = __lpfc_sli_issue_iocb(phba, pring, abtsiocbp, 0);
 
+        if (retval)
+                __lpfc_sli_release_iocbq(phba, abtsiocbp);
 abort_iotag_exit:
         /*
          * Caller to this routine should check for IOCB_ERROR
@@ -3757,6 +4714,29 @@ abort_iotag_exit:
         return retval;
 }
 
+/**
+ * lpfc_sli_validate_fcp_iocb: Filtering function, used to find commands
+ *                    associated with a vport/SCSI target/lun.
+ * @iocbq: Pointer to driver iocb object.
+ * @vport: Pointer to driver virtual port object.
+ * @tgt_id: SCSI ID of the target.
+ * @lun_id: LUN ID of the scsi device.
+ * @ctx_cmd: LPFC_CTX_LUN/LPFC_CTX_TGT/LPFC_CTX_HOST
+ *
+ * This function acts as iocb filter for functions which abort or count
+ * all FCP iocbs pending on a lun/SCSI target/SCSI host. It will return
+ * 0 if the filtering criteria is met for the given iocb and will return
+ * 1 if the filtering criteria is not met.
+ * If ctx_cmd == LPFC_CTX_LUN, the function returns 0 only if the
+ * given iocb is for the SCSI device specified by vport, tgt_id and
+ * lun_id parameter.
+ * If ctx_cmd == LPFC_CTX_TGT,  the function returns 0 only if the
+ * given iocb is for the SCSI target specified by vport and tgt_id
+ * parameters.
+ * If ctx_cmd == LPFC_CTX_HOST, the function returns 0 only if the
+ * given iocb is for the SCSI host associated with the given vport.
+ * This function is called with no locks held.
+ **/
 static int
 lpfc_sli_validate_fcp_iocb(struct lpfc_iocbq *iocbq, struct lpfc_vport *vport,
                            uint16_t tgt_id, uint64_t lun_id,
@@ -3800,6 +4780,25 @@ lpfc_sli_validate_fcp_iocb(struct lpfc_iocbq *iocbq, struct lpfc_vport *vport,
         return rc;
 }
 
+/**
+ * lpfc_sli_sum_iocb: Function to count the number of FCP iocbs pending.
+ * @vport: Pointer to virtual port.
+ * @tgt_id: SCSI ID of the target.
+ * @lun_id: LUN ID of the scsi device.
+ * @ctx_cmd: LPFC_CTX_LUN/LPFC_CTX_TGT/LPFC_CTX_HOST.
+ *
+ * This function returns number of FCP commands pending for the vport.
+ * When ctx_cmd == LPFC_CTX_LUN, the function returns number of FCP
+ * commands pending on the vport associated with SCSI device specified
+ * by tgt_id and lun_id parameters.
+ * When ctx_cmd == LPFC_CTX_TGT, the function returns number of FCP
+ * commands pending on the vport associated with SCSI target specified
+ * by tgt_id parameter.
+ * When ctx_cmd == LPFC_CTX_HOST, the function returns number of FCP
+ * commands pending on the vport.
+ * This function returns the number of iocbs which satisfy the filter.
+ * This function is called without any lock held.
+ **/
 int
 lpfc_sli_sum_iocb(struct lpfc_vport *vport, uint16_t tgt_id, uint64_t lun_id,
                   lpfc_ctx_cmd ctx_cmd)
@@ -3819,6 +4818,17 @@ lpfc_sli_sum_iocb(struct lpfc_vport *vport, uint16_t tgt_id, uint64_t lun_id,
         return sum;
 }
 
+/**
+ * lpfc_sli_abort_fcp_cmpl: Completion handler function for an aborted
+ *       FCP iocb.
+ * @phba: Pointer to HBA context object
+ * @cmdiocb: Pointer to command iocb object.
+ * @rspiocb: Pointer to response iocb object.
+ *
+ * This function is called when an aborted FCP iocb completes. This
+ * function is called by the ring event handler with no lock held.
+ * This function frees the iocb.
+ **/
 void
 lpfc_sli_abort_fcp_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                         struct lpfc_iocbq *rspiocb)
@@ -3827,6 +4837,28 @@ lpfc_sli_abort_fcp_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
         return;
 }
 
+/**
+ * lpfc_sli_abort_iocb: This function issue abort for all SCSI commands
+ *          pending on a SCSI host(vport)/target/lun.
+ * @vport: Pointer to virtual port.
+ * @pring: Pointer to driver SLI ring object.
+ * @tgt_id: SCSI ID of the target.
+ * @lun_id: LUN ID of the scsi device.
+ * @abort_cmd: LPFC_CTX_LUN/LPFC_CTX_TGT/LPFC_CTX_HOST.
+ *
+ * This function sends an abort command for every SCSI command
+ * associated with the given virtual port pending on the ring
+ * filtered by lpfc_sli_validate_fcp_iocb function.
+ * When abort_cmd == LPFC_CTX_LUN, the function sends abort only to the
+ * FCP iocbs associated with lun specified by tgt_id and lun_id
+ * parameters
+ * When abort_cmd == LPFC_CTX_TGT, the function sends abort only to the
+ * FCP iocbs associated with SCSI target specified by tgt_id parameter.
+ * When abort_cmd == LPFC_CTX_HOST, the function sends abort to all
+ * FCP iocbs associated with virtual port.
+ * This function returns number of iocbs it failed to abort.
+ * This function is called with no locks held.
+ **/
 int
 lpfc_sli_abort_iocb(struct lpfc_vport *vport, struct lpfc_sli_ring *pring,
                     uint16_t tgt_id, uint64_t lun_id, lpfc_ctx_cmd abort_cmd)
@@ -3878,6 +4910,24 @@ lpfc_sli_abort_iocb(struct lpfc_vport *vport, struct lpfc_sli_ring *pring,
         return errcnt;
 }
 
+/**
+ * lpfc_sli_wake_iocb_wait: iocb completion handler for iocb issued using
+ *                          lpfc_sli_issue_iocb_wait.
+ * @phba: Pointer to HBA context object.
+ * @cmdiocbq: Pointer to command iocb.
+ * @rspiocbq: Pointer to response iocb.
+ *
+ * This function is the completion handler for iocbs issued using
+ * lpfc_sli_issue_iocb_wait function. This function is called by the
+ * ring event handler function without any lock held. This function
+ * can be called from both worker thread context and interrupt
+ * context. This function also can be called from other thread which
+ * cleans up the SLI layer objects.
+ * This function copy the contents of the response iocb to the
+ * response iocb memory object provided by the caller of
+ * lpfc_sli_issue_iocb_wait and then wakes up the thread which
+ * sleeps for the iocb completion.
+ **/
 static void
 lpfc_sli_wake_iocb_wait(struct lpfc_hba *phba,
                         struct lpfc_iocbq *cmdiocbq,
@@ -3899,13 +4949,36 @@ lpfc_sli_wake_iocb_wait(struct lpfc_hba *phba,
         return;
 }
 
-/*
- * Issue the caller's iocb and wait for its completion, but no longer than the
- * caller's timeout.  Note that iocb_flags is cleared before the
- * lpfc_sli_issue_call since the wake routine sets a unique value and by
- * definition this is a wait function.
- */
-
+/**
+ * lpfc_sli_issue_iocb_wait: Synchronous function to issue iocb commands.
+ * @phba: Pointer to HBA context object..
+ * @pring: Pointer to sli ring.
+ * @piocb: Pointer to command iocb.
+ * @prspiocbq: Pointer to response iocb.
+ * @timeout: Timeout in number of seconds.
+ *
+ * This function issues the iocb to firmware and waits for the
+ * iocb to complete. If the iocb command is not
+ * completed within timeout seconds, it returns IOCB_TIMEDOUT.
+ * Caller should not free the iocb resources if this function
+ * returns IOCB_TIMEDOUT.
+ * The function waits for the iocb completion using an
+ * non-interruptible wait.
+ * This function will sleep while waiting for iocb completion.
+ * So, this function should not be called from any context which
+ * does not allow sleeping. Due to the same reason, this function
+ * cannot be called with interrupt disabled.
+ * This function assumes that the iocb completions occur while
+ * this function sleep. So, this function cannot be called from
+ * the thread which process iocb completion for this ring.
+ * This function clears the iocb_flag of the iocb object before
+ * issuing the iocb and the iocb completion handler sets this
+ * flag and wakes this thread when the iocb completes.
+ * The contents of the response iocb will be copied to prspiocbq
+ * by the completion handler when the command completes.
+ * This function returns IOCB_SUCCESS when success.
+ * This function is called with no lock held.
+ **/
 int
 lpfc_sli_issue_iocb_wait(struct lpfc_hba *phba,
                          struct lpfc_sli_ring *pring,
@@ -3963,7 +5036,7 @@ lpfc_sli_issue_iocb_wait(struct lpfc_hba *phba,
                 }
         } else {
                 lpfc_printf_log(phba, KERN_INFO, LOG_SLI,
-                                ":0332 IOCB wait issue failed, Data x%x\n",
+                                "0332 IOCB wait issue failed, Data x%x\n",
                                 retval);
                 retval = IOCB_ERROR;
         }
@@ -3983,6 +5056,32 @@ lpfc_sli_issue_iocb_wait(struct lpfc_hba *phba,
         return retval;
 }
 
+/**
+ * lpfc_sli_issue_mbox_wait: Synchronous function to issue mailbox.
+ * @phba: Pointer to HBA context object.
+ * @pmboxq: Pointer to driver mailbox object.
+ * @timeout: Timeout in number of seconds.
+ *
+ * This function issues the mailbox to firmware and waits for the
+ * mailbox command to complete. If the mailbox command is not
+ * completed within timeout seconds, it returns MBX_TIMEOUT.
+ * The function waits for the mailbox completion using an
+ * interruptible wait. If the thread is woken up due to a
+ * signal, MBX_TIMEOUT error is returned to the caller. Caller
+ * should not free the mailbox resources, if this function returns
+ * MBX_TIMEOUT.
+ * This function will sleep while waiting for mailbox completion.
+ * So, this function should not be called from any context which
+ * does not allow sleeping. Due to the same reason, this function
+ * cannot be called with interrupt disabled.
+ * This function assumes that the mailbox completion occurs while
+ * this function sleep. So, this function cannot be called from
+ * the worker thread which processes mailbox completion.
+ * This function is called in the context of HBA management
+ * applications.
+ * This function returns MBX_SUCCESS when successful.
+ * This function is called with no lock held.
+ **/
 int
 lpfc_sli_issue_mbox_wait(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmboxq,
                          uint32_t timeout)
@@ -4027,6 +5126,18 @@ lpfc_sli_issue_mbox_wait(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmboxq,
         return retval;
 }
 
+/**
+ * lpfc_sli_flush_mbox_queue: mailbox queue cleanup function.
+ * @phba: Pointer to HBA context.
+ *
+ * This function is called to cleanup any pending mailbox
+ * objects in the driver queue before bringing the HBA offline.
+ * This function is called while resetting the HBA.
+ * The function is called without any lock held. The function
+ * takes hbalock to update SLI data structure.
+ * This function returns 1 when there is an active mailbox
+ * command pending else returns 0.
+ **/
 int
 lpfc_sli_flush_mbox_queue(struct lpfc_hba * phba)
 {
@@ -4058,8 +5169,74 @@ lpfc_sli_flush_mbox_queue(struct lpfc_hba * phba)
         return (phba->sli.sli_flag & LPFC_SLI_MBOX_ACTIVE) ? 1 : 0;
 }
 
+/**
+ * lpfc_sli_check_eratt: check error attention events
+ * @phba: Pointer to HBA context.
+ *
+ * This function is called form timer soft interrupt context to check HBA's
+ * error attention register bit for error attention events.
+ *
+ * This fucntion returns 1 when there is Error Attention in the Host Attention
+ * Register and returns 0 otherwise.
+ **/
+int
+lpfc_sli_check_eratt(struct lpfc_hba *phba)
+{
+        uint32_t ha_copy;
+
+        /* If somebody is waiting to handle an eratt, don't process it
+         * here. The brdkill function will do this.
+         */
+        if (phba->link_flag & LS_IGNORE_ERATT)
+                return 0;
+
+        /* Check if interrupt handler handles this ERATT */
+        spin_lock_irq(&phba->hbalock);
+        if (phba->hba_flag & HBA_ERATT_HANDLED) {
+                /* Interrupt handler has handled ERATT */
+                spin_unlock_irq(&phba->hbalock);
+                return 0;
+        }
+
+        /* Read chip Host Attention (HA) register */
+        ha_copy = readl(phba->HAregaddr);
+        if (ha_copy & HA_ERATT) {
+                /* Read host status register to retrieve error event */
+                lpfc_sli_read_hs(phba);
+                /* Set the driver HA work bitmap */
+                phba->work_ha |= HA_ERATT;
+                /* Indicate polling handles this ERATT */
+                phba->hba_flag |= HBA_ERATT_HANDLED;
+                spin_unlock_irq(&phba->hbalock);
+                return 1;
+        }
+        spin_unlock_irq(&phba->hbalock);
+        return 0;
+}
+
+/**
+ * lpfc_sp_intr_handler: The slow-path interrupt handler of lpfc driver.
+ * @irq: Interrupt number.
+ * @dev_id: The device context pointer.
+ *
+ * This function is directly called from the PCI layer as an interrupt
+ * service routine when the device is enabled with MSI-X multi-message
+ * interrupt mode and there are slow-path events in the HBA. However,
+ * when the device is enabled with either MSI or Pin-IRQ interrupt mode,
+ * this function is called as part of the device-level interrupt handler.
+ * When the PCI slot is in error recovery or the HBA is undergoing
+ * initialization, the interrupt handler will not process the interrupt.
+ * The link attention and ELS ring attention events are handled by the
+ * worker thread. The interrupt handler signals the worker thread and
+ * and returns for these events. This function is called without any
+ * lock held. It gets the hbalock to access and update SLI data
+ * structures.
+ *
+ * This function returns IRQ_HANDLED when interrupt is handled else it
+ * returns IRQ_NONE.
+ **/
 irqreturn_t
-lpfc_intr_handler(int irq, void *dev_id)
+lpfc_sp_intr_handler(int irq, void *dev_id)
 {
         struct lpfc_hba  *phba;
         uint32_t ha_copy;
@@ -4078,48 +5255,52 @@ lpfc_intr_handler(int irq, void *dev_id)
          * Get the driver's phba structure from the dev_id and
          * assume the HBA is not interrupting.
          */
-        phba = (struct lpfc_hba *) dev_id;
+        phba = (struct lpfc_hba *)dev_id;
 
         if (unlikely(!phba))
                 return IRQ_NONE;
 
-        /* If the pci channel is offline, ignore all the interrupts. */
-        if (unlikely(pci_channel_offline(phba->pcidev)))
-                return IRQ_NONE;
-
-        phba->sli.slistat.sli_intr++;
-
         /*
-         * Call the HBA to see if it is interrupting.  If not, don't claim
-         * the interrupt
-         */
-
-        /* Ignore all interrupts during initialization. */
-        if (unlikely(phba->link_state < LPFC_LINK_DOWN))
-                return IRQ_NONE;
-
-        /*
-         * Read host attention register to determine interrupt source
-         * Clear Attention Sources, except Error Attention (to
-         * preserve status) and Link Attention
-         */
-        spin_lock(&phba->hbalock);
-        ha_copy = readl(phba->HAregaddr);
-        /* If somebody is waiting to handle an eratt don't process it
-         * here.  The brdkill function will do this.
+         * Stuff needs to be attented to when this function is invoked as an
+         * individual interrupt handler in MSI-X multi-message interrupt mode
          */
-        if (phba->link_flag & LS_IGNORE_ERATT)
-                ha_copy &= ~HA_ERATT;
-        writel((ha_copy & ~(HA_LATT | HA_ERATT)), phba->HAregaddr);
-        readl(phba->HAregaddr); /* flush */
-        spin_unlock(&phba->hbalock);
-
-        if (unlikely(!ha_copy))
-                return IRQ_NONE;
+        if (phba->intr_type == MSIX) {
+                /* If the pci channel is offline, ignore all the interrupts */
+                if (unlikely(pci_channel_offline(phba->pcidev)))
+                        return IRQ_NONE;
+                /* Update device-level interrupt statistics */
+                phba->sli.slistat.sli_intr++;
+                /* Ignore all interrupts during initialization. */
+                if (unlikely(phba->link_state < LPFC_LINK_DOWN))
+                        return IRQ_NONE;
+                /* Need to read HA REG for slow-path events */
+                spin_lock(&phba->hbalock);
+                ha_copy = readl(phba->HAregaddr);
+                /* If somebody is waiting to handle an eratt don't process it
+                 * here. The brdkill function will do this.
+                 */
+                if (phba->link_flag & LS_IGNORE_ERATT)
+                        ha_copy &= ~HA_ERATT;
+                /* Check the need for handling ERATT in interrupt handler */
+                if (ha_copy & HA_ERATT) {
+                        if (phba->hba_flag & HBA_ERATT_HANDLED)
+                                /* ERATT polling has handled ERATT */
+                                ha_copy &= ~HA_ERATT;
+                        else
+                                /* Indicate interrupt handler handles ERATT */
+                                phba->hba_flag |= HBA_ERATT_HANDLED;
+                }
+                /* Clear up only attention source related to slow-path */
+                writel((ha_copy & (HA_MBATT | HA_R2_CLR_MSK)),
+                        phba->HAregaddr);
+                readl(phba->HAregaddr); /* flush */
+                spin_unlock(&phba->hbalock);
+        } else
+                ha_copy = phba->ha_copy;
 
         work_ha_copy = ha_copy & phba->work_ha_mask;
 
-        if (unlikely(work_ha_copy)) {
+        if (work_ha_copy) {
                 if (work_ha_copy & HA_LATT) {
                         if (phba->sli.sli_flag & LPFC_PROCESS_LA) {
                                 /*
@@ -4138,7 +5319,7 @@ lpfc_intr_handler(int irq, void *dev_id)
                                 work_ha_copy &= ~HA_LATT;
                 }
 
-                if (work_ha_copy & ~(HA_ERATT|HA_MBATT|HA_LATT)) {
+                if (work_ha_copy & ~(HA_ERATT | HA_MBATT | HA_LATT)) {
                         /*
                          * Turn off Slow Rings interrupts, LPFC_ELS_RING is
                          * the only slow ring.
@@ -4179,31 +5360,13 @@ lpfc_intr_handler(int irq, void *dev_id)
                                 spin_unlock(&phba->hbalock);
                         }
                 }
-
-                if (work_ha_copy & HA_ERATT) {
-                        /*
-                         * There was a link/board error.  Read the
-                         * status register to retrieve the error event
-                         * and process it.
-                         */
-                        phba->sli.slistat.err_attn_event++;
-                        /* Save status info */
-                        phba->work_hs = readl(phba->HSregaddr);
-                        phba->work_status[0] = readl(phba->MBslimaddr + 0xa8);
-                        phba->work_status[1] = readl(phba->MBslimaddr + 0xac);
-
-                        /* Clear Chip error bit */
-                        writel(HA_ERATT, phba->HAregaddr);
-                        readl(phba->HAregaddr); /* flush */
-                        phba->pport->stopped = 1;
-                }
-
                 spin_lock(&phba->hbalock);
-                if ((work_ha_copy & HA_MBATT) &&
-                    (phba->sli.mbox_active)) {
+                if (work_ha_copy & HA_ERATT)
+                        lpfc_sli_read_hs(phba);
+                if ((work_ha_copy & HA_MBATT) && (phba->sli.mbox_active)) {
                         pmb = phba->sli.mbox_active;
                         pmbox = &pmb->mb;
-                        mbox = &phba->slim2p->mbx;
+                        mbox = phba->mbox;
                         vport = pmb->vport;
 
                         /* First check out the status word */
@@ -4270,7 +5433,7 @@ lpfc_intr_handler(int irq, void *dev_id)
                                                         lpfc_printf_log(phba,
                                                         KERN_ERR,
                                                         LOG_MBOX | LOG_SLI,
-                                                        "0306 rc should have"
+                                                        "0350 rc should have"
                                                         "been MBX_BUSY");
                                                 goto send_current_mbox;
                                         }
@@ -4283,6 +5446,7 @@ lpfc_intr_handler(int irq, void *dev_id)
                         }
                 } else
                         spin_unlock(&phba->hbalock);
+
                 if ((work_ha_copy & HA_MBATT) &&
                     (phba->sli.mbox_active == NULL)) {
 send_current_mbox:
@@ -4302,15 +5466,74 @@ send_current_mbox:
                 spin_unlock(&phba->hbalock);
                 lpfc_worker_wake_up(phba);
         }
+        return IRQ_HANDLED;
 
-        ha_copy &= ~(phba->work_ha_mask);
+} /* lpfc_sp_intr_handler */
+
+/**
+ * lpfc_fp_intr_handler: The fast-path interrupt handler of lpfc driver.
+ * @irq: Interrupt number.
+ * @dev_id: The device context pointer.
+ *
+ * This function is directly called from the PCI layer as an interrupt
+ * service routine when the device is enabled with MSI-X multi-message
+ * interrupt mode and there is a fast-path FCP IOCB ring event in the
+ * HBA. However, when the device is enabled with either MSI or Pin-IRQ
+ * interrupt mode, this function is called as part of the device-level
+ * interrupt handler. When the PCI slot is in error recovery or the HBA
+ * is undergoing initialization, the interrupt handler will not process
+ * the interrupt. The SCSI FCP fast-path ring event are handled in the
+ * intrrupt context. This function is called without any lock held. It
+ * gets the hbalock to access and update SLI data structures.
+ *
+ * This function returns IRQ_HANDLED when interrupt is handled else it
+ * returns IRQ_NONE.
+ **/
+irqreturn_t
+lpfc_fp_intr_handler(int irq, void *dev_id)
+{
+        struct lpfc_hba  *phba;
+        uint32_t ha_copy;
+        unsigned long status;
+
+        /* Get the driver's phba structure from the dev_id and
+         * assume the HBA is not interrupting.
+         */
+        phba = (struct lpfc_hba *) dev_id;
+
+        if (unlikely(!phba))
+                return IRQ_NONE;
+
+        /*
+         * Stuff needs to be attented to when this function is invoked as an
+         * individual interrupt handler in MSI-X multi-message interrupt mode
+         */
+        if (phba->intr_type == MSIX) {
+                /* If pci channel is offline, ignore all the interrupts */
+                if (unlikely(pci_channel_offline(phba->pcidev)))
+                        return IRQ_NONE;
+                /* Update device-level interrupt statistics */
+                phba->sli.slistat.sli_intr++;
+                /* Ignore all interrupts during initialization. */
+                if (unlikely(phba->link_state < LPFC_LINK_DOWN))
+                        return IRQ_NONE;
+                /* Need to read HA REG for FCP ring and other ring events */
+                ha_copy = readl(phba->HAregaddr);
+                /* Clear up only attention source related to fast-path */
+                spin_lock(&phba->hbalock);
+                writel((ha_copy & (HA_R0_CLR_MSK | HA_R1_CLR_MSK)),
+                        phba->HAregaddr);
+                readl(phba->HAregaddr); /* flush */
+                spin_unlock(&phba->hbalock);
+        } else
+                ha_copy = phba->ha_copy;
 
         /*
-         * Process all events on FCP ring.  Take the optimized path for
-         * FCP IO.  Any other IO is slow path and is handled by
-         * the worker thread.
+         * Process all events on FCP ring. Take the optimized path for FCP IO.
          */
-        status = (ha_copy & (HA_RXMASK  << (4*LPFC_FCP_RING)));
+        ha_copy &= ~(phba->work_ha_mask);
+
+        status = (ha_copy & (HA_RXMASK << (4*LPFC_FCP_RING)));
         status >>= (4*LPFC_FCP_RING);
         if (status & HA_RXMASK)
                 lpfc_sli_handle_fast_ring_event(phba,
@@ -4319,11 +5542,10 @@ send_current_mbox:
 
         if (phba->cfg_multi_ring_support == 2) {
                 /*
-                 * Process all events on extra ring.  Take the optimized path
-                 * for extra ring IO.  Any other IO is slow path and is handled
-                 * by the worker thread.
+                 * Process all events on extra ring. Take the optimized path
+                 * for extra ring IO.
                  */
-                status = (ha_copy & (HA_RXMASK  << (4*LPFC_EXTRA_RING)));
+                status = (ha_copy & (HA_RXMASK << (4*LPFC_EXTRA_RING)));
                 status >>= (4*LPFC_EXTRA_RING);
                 if (status & HA_RXMASK) {
                         lpfc_sli_handle_fast_ring_event(phba,
@@ -4332,5 +5554,106 @@ send_current_mbox:
                 }
         }
         return IRQ_HANDLED;
+}  /* lpfc_fp_intr_handler */
+
+/**
+ * lpfc_intr_handler: The device-level interrupt handler of lpfc driver.
+ * @irq: Interrupt number.
+ * @dev_id: The device context pointer.
+ *
+ * This function is the device-level interrupt handler called from the PCI
+ * layer when either MSI or Pin-IRQ interrupt mode is enabled and there is
+ * an event in the HBA which requires driver attention. This function
+ * invokes the slow-path interrupt attention handling function and fast-path
+ * interrupt attention handling function in turn to process the relevant
+ * HBA attention events. This function is called without any lock held. It
+ * gets the hbalock to access and update SLI data structures.
+ *
+ * This function returns IRQ_HANDLED when interrupt is handled, else it
+ * returns IRQ_NONE.
+ **/
+irqreturn_t
+lpfc_intr_handler(int irq, void *dev_id)
+{
+        struct lpfc_hba  *phba;
+        irqreturn_t sp_irq_rc, fp_irq_rc;
+        unsigned long status1, status2;
+
+        /*
+         * Get the driver's phba structure from the dev_id and
+         * assume the HBA is not interrupting.
+         */
+        phba = (struct lpfc_hba *) dev_id;
+
+        if (unlikely(!phba))
+                return IRQ_NONE;
+
+        /* If the pci channel is offline, ignore all the interrupts. */
+        if (unlikely(pci_channel_offline(phba->pcidev)))
+                return IRQ_NONE;
+
+        /* Update device level interrupt statistics */
+        phba->sli.slistat.sli_intr++;
+
+        /* Ignore all interrupts during initialization. */
+        if (unlikely(phba->link_state < LPFC_LINK_DOWN))
+                return IRQ_NONE;
+
+        spin_lock(&phba->hbalock);
+        phba->ha_copy = readl(phba->HAregaddr);
+        if (unlikely(!phba->ha_copy)) {
+                spin_unlock(&phba->hbalock);
+                return IRQ_NONE;
+        } else if (phba->ha_copy & HA_ERATT) {
+                if (phba->hba_flag & HBA_ERATT_HANDLED)
+                        /* ERATT polling has handled ERATT */
+                        phba->ha_copy &= ~HA_ERATT;
+                else
+                        /* Indicate interrupt handler handles ERATT */
+                        phba->hba_flag |= HBA_ERATT_HANDLED;
+        }
+
+        /* Clear attention sources except link and error attentions */
+        writel((phba->ha_copy & ~(HA_LATT | HA_ERATT)), phba->HAregaddr);
+        readl(phba->HAregaddr); /* flush */
+        spin_unlock(&phba->hbalock);
+
+        /*
+         * Invokes slow-path host attention interrupt handling as appropriate.
+         */
+
+        /* status of events with mailbox and link attention */
+        status1 = phba->ha_copy & (HA_MBATT | HA_LATT | HA_ERATT);
+
+        /* status of events with ELS ring */
+        status2 = (phba->ha_copy & (HA_RXMASK  << (4*LPFC_ELS_RING)));
+        status2 >>= (4*LPFC_ELS_RING);
+
+        if (status1 || (status2 & HA_RXMASK))
+                sp_irq_rc = lpfc_sp_intr_handler(irq, dev_id);
+        else
+                sp_irq_rc = IRQ_NONE;
+
+        /*
+         * Invoke fast-path host attention interrupt handling as appropriate.
+         */
+
+        /* status of events with FCP ring */
+        status1 = (phba->ha_copy & (HA_RXMASK << (4*LPFC_FCP_RING)));
+        status1 >>= (4*LPFC_FCP_RING);
+
+        /* status of events with extra ring */
+        if (phba->cfg_multi_ring_support == 2) {
+                status2 = (phba->ha_copy & (HA_RXMASK << (4*LPFC_EXTRA_RING)));
+                status2 >>= (4*LPFC_EXTRA_RING);
+        } else
+                status2 = 0;
+
+        if ((status1 & HA_RXMASK) || (status2 & HA_RXMASK))
+                fp_irq_rc = lpfc_fp_intr_handler(irq, dev_id);
+        else
+                fp_irq_rc = IRQ_NONE;
 
-} /* lpfc_intr_handler */
+        /* Return device-level interrupt handling status */
+        return (sp_irq_rc == IRQ_HANDLED) ? sp_irq_rc : fp_irq_rc;
+}  /* lpfc_intr_handler */
diff --git a/drivers/scsi/lpfc/lpfc_sli.h b/drivers/scsi/lpfc/lpfc_sli.h
index 7249fd252cbb..883938652a6a 100644
--- a/drivers/scsi/lpfc/lpfc_sli.h
+++ b/drivers/scsi/lpfc/lpfc_sli.h
@@ -233,6 +233,7 @@ struct lpfc_sli {
 #define LPFC_SLI2_ACTIVE          0x200 /* SLI2 overlay in firmware is active */
 #define LPFC_PROCESS_LA           0x400 /* Able to process link attention */
 #define LPFC_BLOCK_MGMT_IO        0x800 /* Don't allow mgmt mbx or iocb cmds */
+#define LPFC_MENLO_MAINT          0x1000 /* need for menl fw download */
 
         struct lpfc_sli_ring ring[LPFC_MAX_RING];
         int fcp_ring;           /* ring used for FCP initiator commands */
diff --git a/drivers/scsi/lpfc/lpfc_version.h b/drivers/scsi/lpfc/lpfc_version.h
index ad24cacfbe10..cc43e9de22cc 100644
--- a/drivers/scsi/lpfc/lpfc_version.h
+++ b/drivers/scsi/lpfc/lpfc_version.h
@@ -18,9 +18,11 @@
  * included with this package.                                     *
  *******************************************************************/
 
-#define LPFC_DRIVER_VERSION "8.2.7"
+#define LPFC_DRIVER_VERSION "8.2.8"
 
-#define LPFC_DRIVER_NAME "lpfc"
+#define LPFC_DRIVER_NAME                "lpfc"
+#define LPFC_SP_DRIVER_HANDLER_NAME     "lpfc:sp"
+#define LPFC_FP_DRIVER_HANDLER_NAME     "lpfc:fp"
 
 #define LPFC_MODULE_DESC "Emulex LightPulse Fibre Channel SCSI driver " \
                 LPFC_DRIVER_VERSION
diff --git a/drivers/scsi/lpfc/lpfc_vport.c b/drivers/scsi/lpfc/lpfc_vport.c
index 109f89d98830..a7de1cc02b40 100644
--- a/drivers/scsi/lpfc/lpfc_vport.c
+++ b/drivers/scsi/lpfc/lpfc_vport.c
@@ -34,6 +34,7 @@
 #include <scsi/scsi_transport_fc.h>
 #include "lpfc_hw.h"
 #include "lpfc_sli.h"
+#include "lpfc_nl.h"
 #include "lpfc_disc.h"
 #include "lpfc_scsi.h"
 #include "lpfc.h"
@@ -204,6 +205,77 @@ lpfc_unique_wwpn(struct lpfc_hba *phba, struct lpfc_vport *new_vport)
         return 1;
 }
 
+/**
+ * lpfc_discovery_wait: Wait for driver discovery to quiesce.
+ * @vport: The virtual port for which this call is being executed.
+ *
+ * This driver calls this routine specifically from lpfc_vport_delete
+ * to enforce a synchronous execution of vport
+ * delete relative to discovery activities.  The
+ * lpfc_vport_delete routine should not return until it
+ * can reasonably guarantee that discovery has quiesced.
+ * Post FDISC LOGO, the driver must wait until its SAN teardown is
+ * complete and all resources recovered before allowing
+ * cleanup.
+ *
+ * This routine does not require any locks held.
+ **/
+static void lpfc_discovery_wait(struct lpfc_vport *vport)
+{
+        struct lpfc_hba *phba = vport->phba;
+        uint32_t wait_flags = 0;
+        unsigned long wait_time_max;
+        unsigned long start_time;
+
+        wait_flags = FC_RSCN_MODE | FC_RSCN_DISCOVERY | FC_NLP_MORE |
+                     FC_RSCN_DEFERRED | FC_NDISC_ACTIVE | FC_DISC_TMO;
+
+        /*
+         * The time constraint on this loop is a balance between the
+         * fabric RA_TOV value and dev_loss tmo.  The driver's
+         * devloss_tmo is 10 giving this loop a 3x multiplier minimally.
+         */
+        wait_time_max = msecs_to_jiffies(((phba->fc_ratov * 3) + 3) * 1000);
+        wait_time_max += jiffies;
+        start_time = jiffies;
+        while (time_before(jiffies, wait_time_max)) {
+                if ((vport->num_disc_nodes > 0)    ||
+                    (vport->fc_flag & wait_flags)  ||
+                    ((vport->port_state > LPFC_VPORT_FAILED) &&
+                     (vport->port_state < LPFC_VPORT_READY))) {
+                        lpfc_printf_log(phba, KERN_INFO, LOG_VPORT,
+                                        "1833 Vport discovery quiesce Wait:"
+                                        " vpi x%x state x%x fc_flags x%x"
+                                        " num_nodes x%x, waiting 1000 msecs"
+                                        " total wait msecs x%x\n",
+                                        vport->vpi, vport->port_state,
+                                        vport->fc_flag, vport->num_disc_nodes,
+                                        jiffies_to_msecs(jiffies - start_time));
+                        msleep(1000);
+                } else {
+                        /* Base case.  Wait variants satisfied.  Break out */
+                        lpfc_printf_log(phba, KERN_INFO, LOG_VPORT,
+                                         "1834 Vport discovery quiesced:"
+                                         " vpi x%x state x%x fc_flags x%x"
+                                         " wait msecs x%x\n",
+                                         vport->vpi, vport->port_state,
+                                         vport->fc_flag,
+                                         jiffies_to_msecs(jiffies
+                                                - start_time));
+                        break;
+                }
+        }
+
+        if (time_after(jiffies, wait_time_max))
+                lpfc_printf_log(phba, KERN_ERR, LOG_VPORT,
+                                "1835 Vport discovery quiesce failed:"
+                                " vpi x%x state x%x fc_flags x%x"
+                                " wait msecs x%x\n",
+                                vport->vpi, vport->port_state,
+                                vport->fc_flag,
+                                jiffies_to_msecs(jiffies - start_time));
+}
+
 int
 lpfc_vport_create(struct fc_vport *fc_vport, bool disable)
 {
@@ -506,8 +578,12 @@ lpfc_vport_delete(struct fc_vport *fc_vport)
          * initiated after we've disposed of all other resources associated
          * with the port.
          */
-        if (!scsi_host_get(shost) || !scsi_host_get(shost))
+        if (!scsi_host_get(shost))
+                return VPORT_INVAL;
+        if (!scsi_host_get(shost)) {
+                scsi_host_put(shost);
                 return VPORT_INVAL;
+        }
         spin_lock_irq(&phba->hbalock);
         vport->load_flag |= FC_UNLOADING;
         spin_unlock_irq(&phba->hbalock);
@@ -597,11 +673,16 @@ lpfc_vport_delete(struct fc_vport *fc_vport)
                 }
                 vport->unreg_vpi_cmpl = VPORT_INVAL;
                 timeout = msecs_to_jiffies(phba->fc_ratov * 2000);
+                if (ndlp->nlp_state == NLP_STE_UNUSED_NODE)
+                        goto skip_logo;
                 if (!lpfc_issue_els_npiv_logo(vport, ndlp))
                         while (vport->unreg_vpi_cmpl == VPORT_INVAL && timeout)
                                 timeout = schedule_timeout(timeout);
         }
 
+        if (!(phba->pport->load_flag & FC_UNLOADING))
+                lpfc_discovery_wait(vport);
+
 skip_logo:
         lpfc_cleanup(vport);
         lpfc_sli_host_down(vport);
@@ -615,8 +696,10 @@ skip_logo:
                  * Completion of unreg_vpi (lpfc_mbx_cmpl_unreg_vpi)
                  * does the scsi_host_put() to release the vport.
                  */
-                lpfc_mbx_unreg_vpi(vport);
-        }
+                if (lpfc_mbx_unreg_vpi(vport))
+                        scsi_host_put(shost);
+        } else
+                scsi_host_put(shost);
 
         lpfc_free_vpi(phba, vport->vpi);
         vport->work_port_events = 0;
@@ -663,3 +746,82 @@ lpfc_destroy_vport_work_array(struct lpfc_hba *phba, struct lpfc_vport **vports)
                 scsi_host_put(lpfc_shost_from_vport(vports[i]));
         kfree(vports);
 }
+
+
+/**
+ * lpfc_vport_reset_stat_data: Reset the statistical data for the vport.
+ * @vport: Pointer to vport object.
+ *
+ * This function resets the statistical data for the vport. This function
+ * is called with the host_lock held
+ **/
+void
+lpfc_vport_reset_stat_data(struct lpfc_vport *vport)
+{
+        struct lpfc_nodelist *ndlp = NULL, *next_ndlp = NULL;
+
+        list_for_each_entry_safe(ndlp, next_ndlp, &vport->fc_nodes, nlp_listp) {
+                if (!NLP_CHK_NODE_ACT(ndlp))
+                        continue;
+                if (ndlp->lat_data)
+                        memset(ndlp->lat_data, 0, LPFC_MAX_BUCKET_COUNT *
+                                sizeof(struct lpfc_scsicmd_bkt));
+        }
+}
+
+
+/**
+ * lpfc_alloc_bucket: Allocate data buffer required for collecting
+ *  statistical data.
+ * @vport: Pointer to vport object.
+ *
+ * This function allocates data buffer required for all the FC
+ * nodes of the vport to collect statistical data.
+ **/
+void
+lpfc_alloc_bucket(struct lpfc_vport *vport)
+{
+        struct lpfc_nodelist *ndlp = NULL, *next_ndlp = NULL;
+
+        list_for_each_entry_safe(ndlp, next_ndlp, &vport->fc_nodes, nlp_listp) {
+                if (!NLP_CHK_NODE_ACT(ndlp))
+                        continue;
+
+                kfree(ndlp->lat_data);
+                ndlp->lat_data = NULL;
+
+                if (ndlp->nlp_state == NLP_STE_MAPPED_NODE) {
+                        ndlp->lat_data = kcalloc(LPFC_MAX_BUCKET_COUNT,
+                                         sizeof(struct lpfc_scsicmd_bkt),
+                                         GFP_ATOMIC);
+
+                        if (!ndlp->lat_data)
+                                lpfc_printf_vlog(vport, KERN_ERR, LOG_NODE,
+                                        "0287 lpfc_alloc_bucket failed to "
+                                        "allocate statistical data buffer DID "
+                                        "0x%x\n", ndlp->nlp_DID);
+                }
+        }
+}
+
+/**
+ * lpfc_free_bucket: Free data buffer required for collecting
+ *  statistical data.
+ * @vport: Pointer to vport object.
+ *
+ * Th function frees statistical data buffer of all the FC
+ * nodes of the vport.
+ **/
+void
+lpfc_free_bucket(struct lpfc_vport *vport)
+{
+        struct lpfc_nodelist *ndlp = NULL, *next_ndlp = NULL;
+
+        list_for_each_entry_safe(ndlp, next_ndlp, &vport->fc_nodes, nlp_listp) {
+                if (!NLP_CHK_NODE_ACT(ndlp))
+                        continue;
+
+                kfree(ndlp->lat_data);
+                ndlp->lat_data = NULL;
+        }
+}
diff --git a/drivers/scsi/lpfc/lpfc_vport.h b/drivers/scsi/lpfc/lpfc_vport.h
index 96c445333b69..90828340acea 100644
--- a/drivers/scsi/lpfc/lpfc_vport.h
+++ b/drivers/scsi/lpfc/lpfc_vport.h
@@ -112,4 +112,8 @@ struct vport_cmd_tag {
 void lpfc_vport_set_state(struct lpfc_vport *vport,
                           enum fc_vport_state new_state);
 
+void lpfc_vport_reset_stat_data(struct lpfc_vport *);
+void lpfc_alloc_bucket(struct lpfc_vport *);
+void lpfc_free_bucket(struct lpfc_vport *);
+
 #endif /* H_LPFC_VPORT */
diff --git a/drivers/scsi/qla2xxx/qla_attr.c b/drivers/scsi/qla2xxx/qla_attr.c
index 0ddfe7106b3b..ed731968f15f 100644
--- a/drivers/scsi/qla2xxx/qla_attr.c
+++ b/drivers/scsi/qla2xxx/qla_attr.c
@@ -1006,7 +1006,6 @@ qla2x00_terminate_rport_io(struct fc_rport *rport)
         }
 
         qla2x00_abort_fcport_cmds(fcport);
-        scsi_target_unblock(&rport->dev);
 }
 
 static int
diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c
index fc4bfa7f839c..a76efd99d007 100644
--- a/drivers/scsi/qla2xxx/qla_isr.c
+++ b/drivers/scsi/qla2xxx/qla_isr.c
@@ -1187,7 +1187,12 @@ qla2x00_status_entry(scsi_qla_host_t *ha, void *pkt)
                     cp->serial_number, comp_status,
                     atomic_read(&fcport->state)));
 
-                cp->result = DID_BUS_BUSY << 16;
+                /*
+                 * We are going to have the fc class block the rport
+                 * while we try to recover so instruct the mid layer
+                 * to requeue until the class decides how to handle this.
+                 */
+                cp->result = DID_TRANSPORT_DISRUPTED << 16;
                 if (atomic_read(&fcport->state) == FCS_ONLINE)
                         qla2x00_mark_device_lost(fcport->ha, fcport, 1, 1);
                 break;
@@ -1214,7 +1219,12 @@ qla2x00_status_entry(scsi_qla_host_t *ha, void *pkt)
                 break;
 
         case CS_TIMEOUT:
-                cp->result = DID_BUS_BUSY << 16;
+                /*
+                 * We are going to have the fc class block the rport
+                 * while we try to recover so instruct the mid layer
+                 * to requeue until the class decides how to handle this.
+                 */
+                cp->result = DID_TRANSPORT_DISRUPTED << 16;
 
                 if (IS_FWI2_CAPABLE(ha)) {
                         DEBUG2(printk(KERN_INFO
diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index 3433441b956a..2aed4721c0d0 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -394,10 +394,8 @@ qla2x00_queuecommand(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
         }
 
         /* Close window on fcport/rport state-transitioning. */
-        if (fcport->drport) {
-                cmd->result = DID_IMM_RETRY << 16;
-                goto qc_fail_command;
-        }
+        if (fcport->drport)
+                goto qc_target_busy;
 
         if (atomic_read(&fcport->state) != FCS_ONLINE) {
                 if (atomic_read(&fcport->state) == FCS_DEVICE_DEAD ||
@@ -405,7 +403,7 @@ qla2x00_queuecommand(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
                         cmd->result = DID_NO_CONNECT << 16;
                         goto qc_fail_command;
                 }
-                goto qc_host_busy;
+                goto qc_target_busy;
         }
 
         spin_unlock_irq(ha->host->host_lock);
@@ -428,10 +426,11 @@ qc_host_busy_free_sp:
 
 qc_host_busy_lock:
         spin_lock_irq(ha->host->host_lock);
-
-qc_host_busy:
         return SCSI_MLQUEUE_HOST_BUSY;
 
+qc_target_busy:
+        return SCSI_MLQUEUE_TARGET_BUSY;
+
 qc_fail_command:
         done(cmd);
 
@@ -461,10 +460,8 @@ qla24xx_queuecommand(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
         }
 
         /* Close window on fcport/rport state-transitioning. */
-        if (fcport->drport) {
-                cmd->result = DID_IMM_RETRY << 16;
-                goto qc24_fail_command;
-        }
+        if (fcport->drport)
+                goto qc24_target_busy;
 
         if (atomic_read(&fcport->state) != FCS_ONLINE) {
                 if (atomic_read(&fcport->state) == FCS_DEVICE_DEAD ||
@@ -472,7 +469,7 @@ qla24xx_queuecommand(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
                         cmd->result = DID_NO_CONNECT << 16;
                         goto qc24_fail_command;
                 }
-                goto qc24_host_busy;
+                goto qc24_target_busy;
         }
 
         spin_unlock_irq(ha->host->host_lock);
@@ -495,10 +492,11 @@ qc24_host_busy_free_sp:
 
 qc24_host_busy_lock:
         spin_lock_irq(ha->host->host_lock);
-
-qc24_host_busy:
         return SCSI_MLQUEUE_HOST_BUSY;
 
+qc24_target_busy:
+        return SCSI_MLQUEUE_TARGET_BUSY;
+
 qc24_fail_command:
         done(cmd);
 
diff --git a/drivers/scsi/qla4xxx/ql4_isr.c b/drivers/scsi/qla4xxx/ql4_isr.c
index a91a57c57bff..799120fcb9be 100644
--- a/drivers/scsi/qla4xxx/ql4_isr.c
+++ b/drivers/scsi/qla4xxx/ql4_isr.c
@@ -139,7 +139,7 @@ static void qla4xxx_status_entry(struct scsi_qla_host *ha,
                               ha->host_no, cmd->device->channel,
                               cmd->device->id, cmd->device->lun));
 
-                cmd->result = DID_BUS_BUSY << 16;
+                cmd->result = DID_TRANSPORT_DISRUPTED << 16;
 
                 /*
                  * Mark device missing so that we won't continue to send
@@ -243,7 +243,7 @@ static void qla4xxx_status_entry(struct scsi_qla_host *ha,
                 if (atomic_read(&ddb_entry->state) == DDB_STATE_ONLINE)
                         qla4xxx_mark_device_missing(ha, ddb_entry);
 
-                cmd->result = DID_BUS_BUSY << 16;
+                cmd->result = DID_TRANSPORT_DISRUPTED << 16;
                 break;
 
         case SCS_QUEUE_FULL:
diff --git a/drivers/scsi/qla4xxx/ql4_os.c b/drivers/scsi/qla4xxx/ql4_os.c
index de8279ad7d89..db7ea3bb4e83 100644
--- a/drivers/scsi/qla4xxx/ql4_os.c
+++ b/drivers/scsi/qla4xxx/ql4_os.c
@@ -353,7 +353,7 @@ void qla4xxx_mark_device_missing(struct scsi_qla_host *ha,
                       ha->host_no, ddb_entry->bus, ddb_entry->target,
                       ddb_entry->fw_ddb_index));
         iscsi_block_session(ddb_entry->sess);
-        iscsi_conn_error(ddb_entry->conn, ISCSI_ERR_CONN_FAILED);
+        iscsi_conn_error_event(ddb_entry->conn, ISCSI_ERR_CONN_FAILED);
 }
 
 static struct srb* qla4xxx_get_new_srb(struct scsi_qla_host *ha,
@@ -439,7 +439,7 @@ static int qla4xxx_queuecommand(struct scsi_cmnd *cmd,
                         cmd->result = DID_NO_CONNECT << 16;
                         goto qc_fail_command;
                 }
-                goto qc_host_busy;
+                return SCSI_MLQUEUE_TARGET_BUSY;
         }
 
         if (test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags))
diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index 2ac3cb2b9081..f8b79d401d58 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -754,8 +754,12 @@ int scsi_dispatch_cmd(struct scsi_cmnd *cmd)
         }
         spin_unlock_irqrestore(host->host_lock, flags);
         if (rtn) {
-                scsi_queue_insert(cmd, (rtn == SCSI_MLQUEUE_DEVICE_BUSY) ?
-                                                rtn : SCSI_MLQUEUE_HOST_BUSY);
+                if (rtn != SCSI_MLQUEUE_DEVICE_BUSY &&
+                    rtn != SCSI_MLQUEUE_TARGET_BUSY)
+                        rtn = SCSI_MLQUEUE_HOST_BUSY;
+
+                scsi_queue_insert(cmd, rtn);
+
                 SCSI_LOG_MLQUEUE(3,
                     printk("queuecommand : request rejected\n"));
         }
@@ -800,6 +804,7 @@ static struct scsi_driver *scsi_cmd_to_driver(struct scsi_cmnd *cmd)
 void scsi_finish_command(struct scsi_cmnd *cmd)
 {
         struct scsi_device *sdev = cmd->device;
+        struct scsi_target *starget = scsi_target(sdev);
         struct Scsi_Host *shost = sdev->host;
         struct scsi_driver *drv;
         unsigned int good_bytes;
@@ -815,6 +820,7 @@ void scsi_finish_command(struct scsi_cmnd *cmd)
          * XXX(hch): What about locking?
          */
         shost->host_blocked = 0;
+        starget->target_blocked = 0;
         sdev->device_blocked = 0;
 
         /*
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index fecefa05cb62..94ed262bdf0c 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -1065,10 +1065,10 @@ static int scsi_eh_target_reset(struct Scsi_Host *shost,
                                 struct list_head *done_q)
 {
         struct scsi_cmnd *scmd, *tgtr_scmd, *next;
-        unsigned int id;
+        unsigned int id = 0;
         int rtn;
 
-        for (id = 0; id <= shost->max_id; id++) {
+        do {
                 tgtr_scmd = NULL;
                 list_for_each_entry(scmd, work_q, eh_entry) {
                         if (id == scmd_id(scmd)) {
@@ -1076,8 +1076,18 @@ static int scsi_eh_target_reset(struct Scsi_Host *shost,
                                 break;
                         }
                 }
+                if (!tgtr_scmd) {
+                        /* not one exactly equal; find the next highest */
+                        list_for_each_entry(scmd, work_q, eh_entry) {
+                                if (scmd_id(scmd) > id &&
+                                    (!tgtr_scmd ||
+                                     scmd_id(tgtr_scmd) > scmd_id(scmd)))
+                                                tgtr_scmd = scmd;
+                        }
+                }
                 if (!tgtr_scmd)
-                        continue;
+                        /* no more commands, that's it */
+                        break;
 
                 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending target reset "
                                                   "to target %d\n",
@@ -1096,7 +1106,8 @@ static int scsi_eh_target_reset(struct Scsi_Host *shost,
                                                           " failed target: "
                                                           "%d\n",
                                                           current->comm, id));
-        }
+                id++;
+        } while(id != 0);
 
         return list_empty(work_q);
 }
@@ -1219,6 +1230,40 @@ static void scsi_eh_offline_sdevs(struct list_head *work_q,
 }
 
 /**
+ * scsi_noretry_cmd - determinte if command should be failed fast
+ * @scmd:       SCSI cmd to examine.
+ */
+int scsi_noretry_cmd(struct scsi_cmnd *scmd)
+{
+        switch (host_byte(scmd->result)) {
+        case DID_OK:
+                break;
+        case DID_BUS_BUSY:
+                return blk_failfast_transport(scmd->request);
+        case DID_PARITY:
+                return blk_failfast_dev(scmd->request);
+        case DID_ERROR:
+                if (msg_byte(scmd->result) == COMMAND_COMPLETE &&
+                    status_byte(scmd->result) == RESERVATION_CONFLICT)
+                        return 0;
+                /* fall through */
+        case DID_SOFT_ERROR:
+                return blk_failfast_driver(scmd->request);
+        }
+
+        switch (status_byte(scmd->result)) {
+        case CHECK_CONDITION:
+                /*
+                 * assume caller has checked sense and determinted
+                 * the check condition was retryable.
+                 */
+                return blk_failfast_dev(scmd->request);
+        }
+
+        return 0;
+}
+
+/**
  * scsi_decide_disposition - Disposition a cmd on return from LLD.
  * @scmd:       SCSI cmd to examine.
  *
@@ -1290,7 +1335,20 @@ int scsi_decide_disposition(struct scsi_cmnd *scmd)
 
         case DID_REQUEUE:
                 return ADD_TO_MLQUEUE;
-
+        case DID_TRANSPORT_DISRUPTED:
+                /*
+                 * LLD/transport was disrupted during processing of the IO.
+                 * The transport class is now blocked/blocking,
+                 * and the transport will decide what to do with the IO
+                 * based on its timers and recovery capablilities.
+                 */
+                return ADD_TO_MLQUEUE;
+        case DID_TRANSPORT_FAILFAST:
+                /*
+                 * The transport decided to failfast the IO (most likely
+                 * the fast io fail tmo fired), so send IO directly upwards.
+                 */
+                return SUCCESS;
         case DID_ERROR:
                 if (msg_byte(scmd->result) == COMMAND_COMPLETE &&
                     status_byte(scmd->result) == RESERVATION_CONFLICT)
@@ -1383,7 +1441,7 @@ int scsi_decide_disposition(struct scsi_cmnd *scmd)
          * even if the request is marked fast fail, we still requeue
          * for queue congestion conditions (QUEUE_FULL or BUSY) */
         if ((++scmd->retries) <= scmd->allowed
-            && !blk_noretry_request(scmd->request)) {
+            && !scsi_noretry_cmd(scmd)) {
                 return NEEDS_RETRY;
         } else {
                 /*
@@ -1508,7 +1566,7 @@ void scsi_eh_flush_done_q(struct list_head *done_q)
         list_for_each_entry_safe(scmd, next, done_q, eh_entry) {
                 list_del_init(&scmd->eh_entry);
                 if (scsi_device_online(scmd->device) &&
-                    !blk_noretry_request(scmd->request) &&
+                    !scsi_noretry_cmd(scmd) &&
                     (++scmd->retries <= scmd->allowed)) {
                         SCSI_LOG_ERROR_RECOVERY(3, printk("%s: flush"
                                                           " retry cmd: %p\n",
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 98ee55ced592..e5a9526d2037 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -114,6 +114,7 @@ int scsi_queue_insert(struct scsi_cmnd *cmd, int reason)
 {
         struct Scsi_Host *host = cmd->device->host;
         struct scsi_device *device = cmd->device;
+        struct scsi_target *starget = scsi_target(device);
         struct request_queue *q = device->request_queue;
         unsigned long flags;
 
@@ -133,10 +134,17 @@ int scsi_queue_insert(struct scsi_cmnd *cmd, int reason)
          * if a command is requeued with no other commands outstanding
          * either for the device or for the host.
          */
-        if (reason == SCSI_MLQUEUE_HOST_BUSY)
+        switch (reason) {
+        case SCSI_MLQUEUE_HOST_BUSY:
                 host->host_blocked = host->max_host_blocked;
-        else if (reason == SCSI_MLQUEUE_DEVICE_BUSY)
+                break;
+        case SCSI_MLQUEUE_DEVICE_BUSY:
                 device->device_blocked = device->max_device_blocked;
+                break;
+        case SCSI_MLQUEUE_TARGET_BUSY:
+                starget->target_blocked = starget->max_target_blocked;
+                break;
+        }
 
         /*
          * Decrement the counters, since these commands are no longer
@@ -460,10 +468,12 @@ static void scsi_init_cmd_errh(struct scsi_cmnd *cmd)
 void scsi_device_unbusy(struct scsi_device *sdev)
 {
         struct Scsi_Host *shost = sdev->host;
+        struct scsi_target *starget = scsi_target(sdev);
         unsigned long flags;
 
         spin_lock_irqsave(shost->host_lock, flags);
         shost->host_busy--;
+        starget->target_busy--;
         if (unlikely(scsi_host_in_recovery(shost) &&
                      (shost->host_failed || shost->host_eh_scheduled)))
                 scsi_eh_wakeup(shost);
@@ -519,6 +529,13 @@ static void scsi_single_lun_run(struct scsi_device *current_sdev)
         spin_unlock_irqrestore(shost->host_lock, flags);
 }
 
+static inline int scsi_target_is_busy(struct scsi_target *starget)
+{
+        return ((starget->can_queue > 0 &&
+                 starget->target_busy >= starget->can_queue) ||
+                 starget->target_blocked);
+}
+
 /*
  * Function:    scsi_run_queue()
  *
@@ -533,7 +550,7 @@ static void scsi_single_lun_run(struct scsi_device *current_sdev)
  */
 static void scsi_run_queue(struct request_queue *q)
 {
-        struct scsi_device *sdev = q->queuedata;
+        struct scsi_device *starved_head = NULL, *sdev = q->queuedata;
         struct Scsi_Host *shost = sdev->host;
         unsigned long flags;
 
@@ -560,6 +577,21 @@ static void scsi_run_queue(struct request_queue *q)
                  */
                 sdev = list_entry(shost->starved_list.next,
                                           struct scsi_device, starved_entry);
+                /*
+                 * The *queue_ready functions can add a device back onto the
+                 * starved list's tail, so we must check for a infinite loop.
+                 */
+                if (sdev == starved_head)
+                        break;
+                if (!starved_head)
+                        starved_head = sdev;
+
+                if (scsi_target_is_busy(scsi_target(sdev))) {
+                        list_move_tail(&sdev->starved_entry,
+                                       &shost->starved_list);
+                        continue;
+                }
+
                 list_del_init(&sdev->starved_entry);
                 spin_unlock(shost->host_lock);
 
@@ -575,13 +607,6 @@ static void scsi_run_queue(struct request_queue *q)
                 spin_unlock(sdev->request_queue->queue_lock);
 
                 spin_lock(shost->host_lock);
-                if (unlikely(!list_empty(&sdev->starved_entry)))
-                        /*
-                         * sdev lost a race, and was put back on the
-                         * starved list. This is unlikely but without this
-                         * in theory we could loop forever.
-                         */
-                        break;
         }
         spin_unlock_irqrestore(shost->host_lock, flags);
 
@@ -681,7 +706,7 @@ static struct scsi_cmnd *scsi_end_request(struct scsi_cmnd *cmd, int error,
                         leftover = req->data_len;
 
                 /* kill remainder if no retrys */
-                if (error && blk_noretry_request(req))
+                if (error && scsi_noretry_cmd(cmd))
                         blk_end_request(req, error, leftover);
                 else {
                         if (requeue) {
@@ -1344,6 +1369,52 @@ static inline int scsi_dev_queue_ready(struct request_queue *q,
         return 1;
 }
 
+
+/*
+ * scsi_target_queue_ready: checks if there we can send commands to target
+ * @sdev: scsi device on starget to check.
+ *
+ * Called with the host lock held.
+ */
+static inline int scsi_target_queue_ready(struct Scsi_Host *shost,
+                                           struct scsi_device *sdev)
+{
+        struct scsi_target *starget = scsi_target(sdev);
+
+        if (starget->single_lun) {
+                if (starget->starget_sdev_user &&
+                    starget->starget_sdev_user != sdev)
+                        return 0;
+                starget->starget_sdev_user = sdev;
+        }
+
+        if (starget->target_busy == 0 && starget->target_blocked) {
+                /*
+                 * unblock after target_blocked iterates to zero
+                 */
+                if (--starget->target_blocked == 0) {
+                        SCSI_LOG_MLQUEUE(3, starget_printk(KERN_INFO, starget,
+                                         "unblocking target at zero depth\n"));
+                } else {
+                        blk_plug_device(sdev->request_queue);
+                        return 0;
+                }
+        }
+
+        if (scsi_target_is_busy(starget)) {
+                if (list_empty(&sdev->starved_entry)) {
+                        list_add_tail(&sdev->starved_entry,
+                                      &shost->starved_list);
+                        return 0;
+                }
+        }
+
+        /* We're OK to process the command, so we can't be starved */
+        if (!list_empty(&sdev->starved_entry))
+                list_del_init(&sdev->starved_entry);
+        return 1;
+}
+
 /*
  * scsi_host_queue_ready: if we can send requests to shost, return 1 else
  * return 0. We must end up running the queue again whenever 0 is
@@ -1390,6 +1461,7 @@ static void scsi_kill_request(struct request *req, struct request_queue *q)
 {
         struct scsi_cmnd *cmd = req->special;
         struct scsi_device *sdev = cmd->device;
+        struct scsi_target *starget = scsi_target(sdev);
         struct Scsi_Host *shost = sdev->host;
 
         blkdev_dequeue_request(req);
@@ -1413,6 +1485,7 @@ static void scsi_kill_request(struct request *req, struct request_queue *q)
         spin_unlock(sdev->request_queue->queue_lock);
         spin_lock(shost->host_lock);
         shost->host_busy++;
+        starget->target_busy++;
         spin_unlock(shost->host_lock);
         spin_lock(sdev->request_queue->queue_lock);
 
@@ -1550,14 +1623,13 @@ static void scsi_request_fn(struct request_queue *q)
                         goto not_ready;
                 }
 
+                if (!scsi_target_queue_ready(shost, sdev))
+                        goto not_ready;
+
                 if (!scsi_host_queue_ready(q, shost, sdev))
                         goto not_ready;
-                if (scsi_target(sdev)->single_lun) {
-                        if (scsi_target(sdev)->starget_sdev_user &&
-                            scsi_target(sdev)->starget_sdev_user != sdev)
-                                goto not_ready;
-                        scsi_target(sdev)->starget_sdev_user = sdev;
-                }
+
+                scsi_target(sdev)->target_busy++;
                 shost->host_busy++;
 
                 /*
diff --git a/drivers/scsi/scsi_priv.h b/drivers/scsi/scsi_priv.h
index 6cddd5dd323c..e1850904ff73 100644
--- a/drivers/scsi/scsi_priv.h
+++ b/drivers/scsi/scsi_priv.h
@@ -59,6 +59,7 @@ void scsi_eh_ready_devs(struct Scsi_Host *shost,
                         struct list_head *done_q);
 int scsi_eh_get_sense(struct list_head *work_q,
                       struct list_head *done_q);
+int scsi_noretry_cmd(struct scsi_cmnd *scmd);
 
 /* scsi_lib.c */
 extern int scsi_maybe_unblock_host(struct scsi_device *sdev);
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 334862e26a1b..b14dc02c3ded 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -419,6 +419,7 @@ static struct scsi_target *scsi_alloc_target(struct device *parent,
         dev->type = &scsi_target_type;
         starget->id = id;
         starget->channel = channel;
+        starget->can_queue = 0;
         INIT_LIST_HEAD(&starget->siblings);
         INIT_LIST_HEAD(&starget->devices);
         starget->state = STARGET_CREATED;
diff --git a/drivers/scsi/scsi_transport_fc.c b/drivers/scsi/scsi_transport_fc.c
index d5f7653bb94b..1e71abf0607a 100644
--- a/drivers/scsi/scsi_transport_fc.c
+++ b/drivers/scsi/scsi_transport_fc.c
@@ -2133,8 +2133,7 @@ fc_attach_transport(struct fc_function_template *ft)
         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
-        if (ft->terminate_rport_io)
-                SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
+        SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
 
         BUG_ON(count > FC_RPORT_NUM_ATTRS);
 
@@ -2328,6 +2327,22 @@ fc_remove_host(struct Scsi_Host *shost)
 }
 EXPORT_SYMBOL(fc_remove_host);
 
+static void fc_terminate_rport_io(struct fc_rport *rport)
+{
+        struct Scsi_Host *shost = rport_to_shost(rport);
+        struct fc_internal *i = to_fc_internal(shost->transportt);
+
+        /* Involve the LLDD if possible to terminate all io on the rport. */
+        if (i->f->terminate_rport_io)
+                i->f->terminate_rport_io(rport);
+
+        /*
+         * must unblock to flush queued IO. The caller will have set
+         * the port_state or flags, so that fc_remote_port_chkready will
+         * fail IO.
+         */
+        scsi_target_unblock(&rport->dev);
+}
 
 /**
  * fc_starget_delete - called to delete the scsi decendents of an rport
@@ -2340,13 +2355,8 @@ fc_starget_delete(struct work_struct *work)
 {
         struct fc_rport *rport =
                 container_of(work, struct fc_rport, stgt_delete_work);
-        struct Scsi_Host *shost = rport_to_shost(rport);
-        struct fc_internal *i = to_fc_internal(shost->transportt);
-
-        /* Involve the LLDD if possible to terminate all io on the rport. */
-        if (i->f->terminate_rport_io)
-                i->f->terminate_rport_io(rport);
 
+        fc_terminate_rport_io(rport);
         scsi_remove_target(&rport->dev);
 }
 
@@ -2372,10 +2382,7 @@ fc_rport_final_delete(struct work_struct *work)
         if (rport->flags & FC_RPORT_SCAN_PENDING)
                 scsi_flush_work(shost);
 
-        /* involve the LLDD to terminate all pending i/o */
-        if (i->f->terminate_rport_io)
-                i->f->terminate_rport_io(rport);
-
+        fc_terminate_rport_io(rport);
         /*
          * Cancel any outstanding timers. These should really exist
          * only when rmmod'ing the LLDD and we're asking for
@@ -2639,7 +2646,8 @@ fc_remote_port_add(struct Scsi_Host *shost, int channel,
 
                                 spin_lock_irqsave(shost->host_lock, flags);
 
-                                rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
+                                rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
+                                                  FC_RPORT_DEVLOSS_PENDING);
 
                                 /* if target, initiate a scan */
                                 if (rport->scsi_target_id != -1) {
@@ -2702,6 +2710,7 @@ fc_remote_port_add(struct Scsi_Host *shost, int channel,
                         rport->port_id = ids->port_id;
                         rport->roles = ids->roles;
                         rport->port_state = FC_PORTSTATE_ONLINE;
+                        rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
 
                         if (fci->f->dd_fcrport_size)
                                 memset(rport->dd_data, 0,
@@ -2784,7 +2793,6 @@ void
 fc_remote_port_delete(struct fc_rport  *rport)
 {
         struct Scsi_Host *shost = rport_to_shost(rport);
-        struct fc_internal *i = to_fc_internal(shost->transportt);
         int timeout = rport->dev_loss_tmo;
         unsigned long flags;
 
@@ -2830,7 +2838,7 @@ fc_remote_port_delete(struct fc_rport  *rport)
 
         /* see if we need to kill io faster than waiting for device loss */
         if ((rport->fast_io_fail_tmo != -1) &&
-            (rport->fast_io_fail_tmo < timeout) && (i->f->terminate_rport_io))
+            (rport->fast_io_fail_tmo < timeout))
                 fc_queue_devloss_work(shost, &rport->fail_io_work,
                                         rport->fast_io_fail_tmo * HZ);
 
@@ -2906,7 +2914,8 @@ fc_remote_port_rolechg(struct fc_rport  *rport, u32 roles)
                         fc_flush_devloss(shost);
 
                 spin_lock_irqsave(shost->host_lock, flags);
-                rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
+                rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
+                                  FC_RPORT_DEVLOSS_PENDING);
                 spin_unlock_irqrestore(shost->host_lock, flags);
 
                 /* ensure any stgt delete functions are done */
@@ -3001,6 +3010,7 @@ fc_timeout_deleted_rport(struct work_struct *work)
         rport->supported_classes = FC_COS_UNSPECIFIED;
         rport->roles = FC_PORT_ROLE_UNKNOWN;
         rport->port_state = FC_PORTSTATE_NOTPRESENT;
+        rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
 
         /* remove the identifiers that aren't used in the consisting binding */
         switch (fc_host->tgtid_bind_type) {
@@ -3043,13 +3053,12 @@ fc_timeout_fail_rport_io(struct work_struct *work)
 {
         struct fc_rport *rport =
                 container_of(work, struct fc_rport, fail_io_work.work);
-        struct Scsi_Host *shost = rport_to_shost(rport);
-        struct fc_internal *i = to_fc_internal(shost->transportt);
 
         if (rport->port_state != FC_PORTSTATE_BLOCKED)
                 return;
 
-        i->f->terminate_rport_io(rport);
+        rport->flags |= FC_RPORT_FAST_FAIL_TIMEDOUT;
+        fc_terminate_rport_io(rport);
 }
 
 /**
diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index 0ce5f7cdfe2a..4a803ebaf508 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -138,7 +138,7 @@ static ssize_t
 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
 {
         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
-        return sprintf(buf, "%u\n", ep->id);
+        return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
 }
 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
 
@@ -156,7 +156,7 @@ static struct attribute_group iscsi_endpoint_group = {
 static int iscsi_match_epid(struct device *dev, void *data)
 {
         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
-        unsigned int *epid = (unsigned int *) data;
+        uint64_t *epid = (uint64_t *) data;
 
         return *epid == ep->id;
 }
@@ -166,7 +166,7 @@ iscsi_create_endpoint(int dd_size)
 {
         struct device *dev;
         struct iscsi_endpoint *ep;
-        unsigned int id;
+        uint64_t id;
         int err;
 
         for (id = 1; id < ISCSI_MAX_EPID; id++) {
@@ -187,7 +187,8 @@ iscsi_create_endpoint(int dd_size)
 
         ep->id = id;
         ep->dev.class = &iscsi_endpoint_class;
-        snprintf(ep->dev.bus_id, BUS_ID_SIZE, "ep-%u", id);
+        snprintf(ep->dev.bus_id, BUS_ID_SIZE, "ep-%llu",
+                 (unsigned long long) id);
         err = device_register(&ep->dev);
         if (err)
                 goto free_ep;
@@ -374,10 +375,10 @@ int iscsi_session_chkready(struct iscsi_cls_session *session)
                 err = 0;
                 break;
         case ISCSI_SESSION_FAILED:
-                err = DID_IMM_RETRY << 16;
+                err = DID_TRANSPORT_DISRUPTED << 16;
                 break;
         case ISCSI_SESSION_FREE:
-                err = DID_NO_CONNECT << 16;
+                err = DID_TRANSPORT_FAILFAST << 16;
                 break;
         default:
                 err = DID_NO_CONNECT << 16;
@@ -1010,7 +1011,7 @@ int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
 
         skb = alloc_skb(len, GFP_ATOMIC);
         if (!skb) {
-                iscsi_conn_error(conn, ISCSI_ERR_CONN_FAILED);
+                iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
                 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
                                       "control PDU: OOM\n");
                 return -ENOMEM;
@@ -1031,7 +1032,7 @@ int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
 }
 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
 
-void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error)
+void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
 {
         struct nlmsghdr *nlh;
         struct sk_buff  *skb;
@@ -1063,7 +1064,7 @@ void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error)
         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
                               error);
 }
-EXPORT_SYMBOL_GPL(iscsi_conn_error);
+EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
 
 static int
 iscsi_if_send_reply(int pid, int seq, int type, int done, int multi,
diff --git a/drivers/scsi/scsi_transport_spi.c b/drivers/scsi/scsi_transport_spi.c
index b29360ed0bdc..7c2d28924d2a 100644
--- a/drivers/scsi/scsi_transport_spi.c
+++ b/drivers/scsi/scsi_transport_spi.c
@@ -109,7 +109,9 @@ static int spi_execute(struct scsi_device *sdev, const void *cmd,
         for(i = 0; i < DV_RETRIES; i++) {
                 result = scsi_execute(sdev, cmd, dir, buffer, bufflen,
                                       sense, DV_TIMEOUT, /* retries */ 1,
-                                      REQ_FAILFAST);
+                                      REQ_FAILFAST_DEV |
+                                      REQ_FAILFAST_TRANSPORT |
+                                      REQ_FAILFAST_DRIVER);
                 if (result & DRIVER_SENSE) {
                         struct scsi_sense_hdr sshdr_tmp;
                         if (!sshdr)
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index a7b53be63367..7c4d2e68df1c 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -384,7 +384,7 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
         sector_t block = rq->sector;
         sector_t threshold;
         unsigned int this_count = rq->nr_sectors;
-        int ret;
+        int ret, host_dif;
 
         if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
                 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
@@ -515,7 +515,8 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
                                         rq->nr_sectors));
 
         /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
-        if (scsi_host_dif_capable(sdp->host, sdkp->protection_type))
+        host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
+        if (host_dif)
                 SCpnt->cmnd[1] = 1 << 5;
         else
                 SCpnt->cmnd[1] = 0;
@@ -573,8 +574,9 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
         SCpnt->sdb.length = this_count * sdp->sector_size;
 
         /* If DIF or DIX is enabled, tell HBA how to handle request */
-        if (sdkp->protection_type || scsi_prot_sg_count(SCpnt))
-                sd_dif_op(SCpnt, sdkp->protection_type, scsi_prot_sg_count(SCpnt));
+        if (host_dif || scsi_prot_sg_count(SCpnt))
+                sd_dif_op(SCpnt, host_dif, scsi_prot_sg_count(SCpnt),
+                          sdkp->protection_type);
 
         /*
          * We shouldn't disconnect in the middle of a sector, so with a dumb
@@ -1252,14 +1254,12 @@ void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
         else
                 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
 
+        sdkp->protection_type = type;
+
         switch (type) {
         case SD_DIF_TYPE0_PROTECTION:
-                sdkp->protection_type = 0;
-                break;
-
         case SD_DIF_TYPE1_PROTECTION:
         case SD_DIF_TYPE3_PROTECTION:
-                sdkp->protection_type = type;
                 break;
 
         case SD_DIF_TYPE2_PROTECTION:
@@ -1277,7 +1277,6 @@ void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
         return;
 
 disable:
-        sdkp->protection_type = 0;
         sdkp->capacity = 0;
 }
 
diff --git a/drivers/scsi/sd.h b/drivers/scsi/sd.h
index 95b9f06534d5..75638e7d3f66 100644
--- a/drivers/scsi/sd.h
+++ b/drivers/scsi/sd.h
@@ -97,19 +97,28 @@ struct sd_dif_tuple {
        __be32 ref_tag;          /* Target LBA or indirect LBA */
 };
 
-#if defined(CONFIG_BLK_DEV_INTEGRITY)
+#ifdef CONFIG_BLK_DEV_INTEGRITY
 
-extern void sd_dif_op(struct scsi_cmnd *, unsigned int, unsigned int);
+extern void sd_dif_op(struct scsi_cmnd *, unsigned int, unsigned int, unsigned int);
 extern void sd_dif_config_host(struct scsi_disk *);
 extern int sd_dif_prepare(struct request *rq, sector_t, unsigned int);
 extern void sd_dif_complete(struct scsi_cmnd *, unsigned int);
 
 #else /* CONFIG_BLK_DEV_INTEGRITY */
 
-#define sd_dif_op(a, b, c)                      do { } while (0)
-#define sd_dif_config_host(a)                   do { } while (0)
-#define sd_dif_prepare(a, b, c)                 (0)
-#define sd_dif_complete(a, b)                   (0)
+static inline void sd_dif_op(struct scsi_cmnd *cmd, unsigned int a, unsigned int b, unsigned int c)
+{
+}
+static inline void sd_dif_config_host(struct scsi_disk *disk)
+{
+}
+static inline int sd_dif_prepare(struct request *rq, sector_t s, unsigned int a)
+{
+        return 0;
+}
+static inline void sd_dif_complete(struct scsi_cmnd *cmd, unsigned int a)
+{
+}
 
 #endif /* CONFIG_BLK_DEV_INTEGRITY */
 
diff --git a/drivers/scsi/sd_dif.c b/drivers/scsi/sd_dif.c
index 4d17f3d35aac..3ebb1f289490 100644
--- a/drivers/scsi/sd_dif.c
+++ b/drivers/scsi/sd_dif.c
@@ -311,25 +311,26 @@ void sd_dif_config_host(struct scsi_disk *sdkp)
         struct scsi_device *sdp = sdkp->device;
         struct gendisk *disk = sdkp->disk;
         u8 type = sdkp->protection_type;
+        int dif, dix;
 
-        /* If this HBA doesn't support DIX, resort to normal I/O or DIF */
-        if (scsi_host_dix_capable(sdp->host, type) == 0) {
+        dif = scsi_host_dif_capable(sdp->host, type);
+        dix = scsi_host_dix_capable(sdp->host, type);
 
-                if (type == SD_DIF_TYPE0_PROTECTION)
-                        return;
-
-                if (scsi_host_dif_capable(sdp->host, type) == 0) {
-                        sd_printk(KERN_INFO, sdkp, "Type %d protection " \
-                                  "unsupported by HBA. Disabling DIF.\n", type);
-                        sdkp->protection_type = 0;
-                        return;
-                }
+        if (!dix && scsi_host_dix_capable(sdp->host, 0)) {
+                dif = 0; dix = 1;
+        }
 
-                sd_printk(KERN_INFO, sdkp, "Enabling DIF Type %d protection\n",
-                          type);
+        if (type) {
+                if (dif)
+                        sd_printk(KERN_NOTICE, sdkp,
+                                  "Enabling DIF Type %d protection\n", type);
+                else
+                        sd_printk(KERN_NOTICE, sdkp,
+                                  "Disabling DIF Type %d protection\n", type);
+        }
 
+        if (!dix)
                 return;
-        }
 
         /* Enable DMA of protection information */
         if (scsi_host_get_guard(sdkp->device->host) & SHOST_DIX_GUARD_IP)
@@ -343,17 +344,17 @@ void sd_dif_config_host(struct scsi_disk *sdkp)
                 else
                         blk_integrity_register(disk, &dif_type1_integrity_crc);
 
-        sd_printk(KERN_INFO, sdkp,
-                  "Enabling %s integrity protection\n", disk->integrity->name);
+        sd_printk(KERN_NOTICE, sdkp,
+                  "Enabling DIX %s protection\n", disk->integrity->name);
 
         /* Signal to block layer that we support sector tagging */
-        if (type && sdkp->ATO) {
+        if (dif && type && sdkp->ATO) {
                 if (type == SD_DIF_TYPE3_PROTECTION)
                         disk->integrity->tag_size = sizeof(u16) + sizeof(u32);
                 else
                         disk->integrity->tag_size = sizeof(u16);
 
-                sd_printk(KERN_INFO, sdkp, "DIF application tag size %u\n",
+                sd_printk(KERN_NOTICE, sdkp, "DIF application tag size %u\n",
                           disk->integrity->tag_size);
         }
 }
@@ -361,7 +362,7 @@ void sd_dif_config_host(struct scsi_disk *sdkp)
 /*
  * DIF DMA operation magic decoder ring.
  */
-void sd_dif_op(struct scsi_cmnd *scmd, unsigned int dif, unsigned int dix)
+void sd_dif_op(struct scsi_cmnd *scmd, unsigned int dif, unsigned int dix, unsigned int type)
 {
         int csum_convert, prot_op;
 
@@ -406,7 +407,8 @@ void sd_dif_op(struct scsi_cmnd *scmd, unsigned int dif, unsigned int dix)
         }
 
         scsi_set_prot_op(scmd, prot_op);
-        scsi_set_prot_type(scmd, dif);
+        if (dif)
+                scsi_set_prot_type(scmd, type);
 }
 
 /*
diff --git a/include/linux/bio.h b/include/linux/bio.h
index ff5b4cf9e2da..1beda208cbfb 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -129,25 +129,30 @@ struct bio {
  * bit 2 -- barrier
  *      Insert a serialization point in the IO queue, forcing previously
  *      submitted IO to be completed before this oen is issued.
- * bit 3 -- fail fast, don't want low level driver retries
- * bit 4 -- synchronous I/O hint: the block layer will unplug immediately
+ * bit 3 -- synchronous I/O hint: the block layer will unplug immediately
  *      Note that this does NOT indicate that the IO itself is sync, just
  *      that the block layer will not postpone issue of this IO by plugging.
- * bit 5 -- metadata request
+ * bit 4 -- metadata request
  *      Used for tracing to differentiate metadata and data IO. May also
  *      get some preferential treatment in the IO scheduler
- * bit 6 -- discard sectors
+ * bit 5 -- discard sectors
  *      Informs the lower level device that this range of sectors is no longer
  *      used by the file system and may thus be freed by the device. Used
  *      for flash based storage.
+ * bit 6 -- fail fast device errors
+ * bit 7 -- fail fast transport errors
+ * bit 8 -- fail fast driver errors
+ *      Don't want driver retries for any fast fail whatever the reason.
  */
 #define BIO_RW          0       /* Must match RW in req flags (blkdev.h) */
 #define BIO_RW_AHEAD    1       /* Must match FAILFAST in req flags */
 #define BIO_RW_BARRIER  2
-#define BIO_RW_FAILFAST 3
-#define BIO_RW_SYNC     4
-#define BIO_RW_META     5
-#define BIO_RW_DISCARD  6
+#define BIO_RW_SYNC     3
+#define BIO_RW_META     4
+#define BIO_RW_DISCARD  5
+#define BIO_RW_FAILFAST_DEV             6
+#define BIO_RW_FAILFAST_TRANSPORT       7
+#define BIO_RW_FAILFAST_DRIVER          8
 
 /*
  * upper 16 bits of bi_rw define the io priority of this bio
@@ -174,7 +179,10 @@ struct bio {
 #define bio_sectors(bio)        ((bio)->bi_size >> 9)
 #define bio_barrier(bio)        ((bio)->bi_rw & (1 << BIO_RW_BARRIER))
 #define bio_sync(bio)           ((bio)->bi_rw & (1 << BIO_RW_SYNC))
-#define bio_failfast(bio)       ((bio)->bi_rw & (1 << BIO_RW_FAILFAST))
+#define bio_failfast_dev(bio)   ((bio)->bi_rw & (1 << BIO_RW_FAILFAST_DEV))
+#define bio_failfast_transport(bio)     \
+        ((bio)->bi_rw & (1 << BIO_RW_FAILFAST_TRANSPORT))
+#define bio_failfast_driver(bio) ((bio)->bi_rw & (1 << BIO_RW_FAILFAST_DRIVER))
 #define bio_rw_ahead(bio)       ((bio)->bi_rw & (1 << BIO_RW_AHEAD))
 #define bio_rw_meta(bio)        ((bio)->bi_rw & (1 << BIO_RW_META))
 #define bio_discard(bio)        ((bio)->bi_rw & (1 << BIO_RW_DISCARD))
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index a92d9e4ea96e..f3491d225268 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -87,7 +87,9 @@ enum {
  */
 enum rq_flag_bits {
         __REQ_RW,               /* not set, read. set, write */
-        __REQ_FAILFAST,         /* no low level driver retries */
+        __REQ_FAILFAST_DEV,     /* no driver retries of device errors */
+        __REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */
+        __REQ_FAILFAST_DRIVER,  /* no driver retries of driver errors */
         __REQ_DISCARD,          /* request to discard sectors */
         __REQ_SORTED,           /* elevator knows about this request */
         __REQ_SOFTBARRIER,      /* may not be passed by ioscheduler */
@@ -111,8 +113,10 @@ enum rq_flag_bits {
 };
 
 #define REQ_RW          (1 << __REQ_RW)
+#define REQ_FAILFAST_DEV        (1 << __REQ_FAILFAST_DEV)
+#define REQ_FAILFAST_TRANSPORT  (1 << __REQ_FAILFAST_TRANSPORT)
+#define REQ_FAILFAST_DRIVER     (1 << __REQ_FAILFAST_DRIVER)
 #define REQ_DISCARD     (1 << __REQ_DISCARD)
-#define REQ_FAILFAST    (1 << __REQ_FAILFAST)
 #define REQ_SORTED      (1 << __REQ_SORTED)
 #define REQ_SOFTBARRIER (1 << __REQ_SOFTBARRIER)
 #define REQ_HARDBARRIER (1 << __REQ_HARDBARRIER)
@@ -560,7 +564,12 @@ enum {
 #define blk_special_request(rq) ((rq)->cmd_type == REQ_TYPE_SPECIAL)
 #define blk_sense_request(rq)   ((rq)->cmd_type == REQ_TYPE_SENSE)
 
-#define blk_noretry_request(rq) ((rq)->cmd_flags & REQ_FAILFAST)
+#define blk_failfast_dev(rq)    ((rq)->cmd_flags & REQ_FAILFAST_DEV)
+#define blk_failfast_transport(rq) ((rq)->cmd_flags & REQ_FAILFAST_TRANSPORT)
+#define blk_failfast_driver(rq) ((rq)->cmd_flags & REQ_FAILFAST_DRIVER)
+#define blk_noretry_request(rq) (blk_failfast_dev(rq) ||        \
+                                 blk_failfast_transport(rq) ||  \
+                                 blk_failfast_driver(rq))
 #define blk_rq_started(rq)      ((rq)->cmd_flags & REQ_STARTED)
 
 #define blk_account_rq(rq)      (blk_rq_started(rq) && (blk_fs_request(rq) || blk_discard_rq(rq))) 
diff --git a/include/scsi/iscsi_if.h b/include/scsi/iscsi_if.h
index 16be12f1cbe8..0c9514de5df7 100644
--- a/include/scsi/iscsi_if.h
+++ b/include/scsi/iscsi_if.h
@@ -213,6 +213,8 @@ enum iscsi_err {
         ISCSI_ERR_DATA_DGST             = ISCSI_ERR_BASE + 15,
         ISCSI_ERR_PARAM_NOT_FOUND       = ISCSI_ERR_BASE + 16,
         ISCSI_ERR_NO_SCSI_CMD           = ISCSI_ERR_BASE + 17,
+        ISCSI_ERR_INVALID_HOST          = ISCSI_ERR_BASE + 18,
+        ISCSI_ERR_XMIT_FAILED           = ISCSI_ERR_BASE + 19,
 };
 
 /*
diff --git a/include/scsi/libiscsi.h b/include/scsi/libiscsi.h
index 5e75bb7f311c..61e53f14f7e1 100644
--- a/include/scsi/libiscsi.h
+++ b/include/scsi/libiscsi.h
@@ -287,6 +287,11 @@ struct iscsi_session {
         struct iscsi_pool       cmdpool;        /* PDU's pool */
 };
 
+enum {
+        ISCSI_HOST_SETUP,
+        ISCSI_HOST_REMOVED,
+};
+
 struct iscsi_host {
         char                    *initiatorname;
         /* hw address or netdev iscsi connection is bound to */
@@ -295,6 +300,12 @@ struct iscsi_host {
         /* local address */
         int                     local_port;
         char                    local_address[ISCSI_ADDRESS_BUF_LEN];
+
+        wait_queue_head_t       session_removal_wq;
+        /* protects sessions and state */
+        spinlock_t              lock;
+        int                     num_sessions;
+        int                     state;
 };
 
 /*
@@ -302,7 +313,7 @@ struct iscsi_host {
  */
 extern int iscsi_change_queue_depth(struct scsi_device *sdev, int depth);
 extern int iscsi_eh_abort(struct scsi_cmnd *sc);
-extern int iscsi_eh_host_reset(struct scsi_cmnd *sc);
+extern int iscsi_eh_target_reset(struct scsi_cmnd *sc);
 extern int iscsi_eh_device_reset(struct scsi_cmnd *sc);
 extern int iscsi_queuecommand(struct scsi_cmnd *sc,
                               void (*done)(struct scsi_cmnd *));
@@ -351,6 +362,8 @@ extern void iscsi_conn_stop(struct iscsi_cls_conn *, int);
 extern int iscsi_conn_bind(struct iscsi_cls_session *, struct iscsi_cls_conn *,
                            int);
 extern void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err);
+extern void iscsi_session_failure(struct iscsi_cls_session *cls_session,
+                                  enum iscsi_err err);
 extern int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
                                 enum iscsi_param param, char *buf);
 extern void iscsi_suspend_tx(struct iscsi_conn *conn);
diff --git a/include/scsi/scsi.h b/include/scsi/scsi.h
index 192f8716aa9e..a109165714d6 100644
--- a/include/scsi/scsi.h
+++ b/include/scsi/scsi.h
@@ -381,6 +381,11 @@ static inline int scsi_is_wlun(unsigned int lun)
 #define DID_IMM_RETRY   0x0c    /* Retry without decrementing retry count  */
 #define DID_REQUEUE     0x0d    /* Requeue command (no immediate retry) also
                                  * without decrementing the retry count    */
+#define DID_TRANSPORT_DISRUPTED 0x0e /* Transport error disrupted execution
+                                      * and the driver blocked the port to
+                                      * recover the link. Transport class will
+                                      * retry or fail IO */
+#define DID_TRANSPORT_FAILFAST  0x0f /* Transport class fastfailed the io */
 #define DRIVER_OK       0x00    /* Driver status                           */
 
 /*
@@ -426,6 +431,7 @@ static inline int scsi_is_wlun(unsigned int lun)
 #define SCSI_MLQUEUE_HOST_BUSY   0x1055
 #define SCSI_MLQUEUE_DEVICE_BUSY 0x1056
 #define SCSI_MLQUEUE_EH_RETRY    0x1057
+#define SCSI_MLQUEUE_TARGET_BUSY 0x1058
 
 /*
  *  Use these to separate status msg and our bytes
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index b49e725be039..a37a8148a310 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -238,6 +238,16 @@ struct scsi_target {
                                                  * for the device at a time. */
         unsigned int            pdt_1f_for_no_lun;      /* PDT = 0x1f */
                                                 /* means no lun present */
+        /* commands actually active on LLD. protected by host lock. */
+        unsigned int            target_busy;
+        /*
+         * LLDs should set this in the slave_alloc host template callout.
+         * If set to zero then there is not limit.
+         */
+        unsigned int            can_queue;
+        unsigned int            target_blocked;
+        unsigned int            max_target_blocked;
+#define SCSI_DEFAULT_TARGET_BLOCKED     3
 
         char                    scsi_level;
         struct execute_work     ew;
diff --git a/include/scsi/scsi_transport_fc.h b/include/scsi/scsi_transport_fc.h
index 21018a4df452..49d8913c4f86 100644
--- a/include/scsi/scsi_transport_fc.h
+++ b/include/scsi/scsi_transport_fc.h
@@ -357,6 +357,7 @@ struct fc_rport {	/* aka fc_starget_attrs */
 /* bit field values for struct fc_rport "flags" field: */
 #define FC_RPORT_DEVLOSS_PENDING        0x01
 #define FC_RPORT_SCAN_PENDING           0x02
+#define FC_RPORT_FAST_FAIL_TIMEDOUT     0x03
 
 #define dev_to_rport(d)                         \
         container_of(d, struct fc_rport, dev)
@@ -678,12 +679,15 @@ fc_remote_port_chkready(struct fc_rport *rport)
                 if (rport->roles & FC_PORT_ROLE_FCP_TARGET)
                         result = 0;
                 else if (rport->flags & FC_RPORT_DEVLOSS_PENDING)
-                        result = DID_IMM_RETRY << 16;
+                        result = DID_TRANSPORT_DISRUPTED << 16;
                 else
                         result = DID_NO_CONNECT << 16;
                 break;
         case FC_PORTSTATE_BLOCKED:
-                result = DID_IMM_RETRY << 16;
+                if (rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)
+                        result = DID_TRANSPORT_FAILFAST << 16;
+                else
+                        result = DID_TRANSPORT_DISRUPTED << 16;
                 break;
         default:
                 result = DID_NO_CONNECT << 16;
diff --git a/include/scsi/scsi_transport_iscsi.h b/include/scsi/scsi_transport_iscsi.h
index 8b6c91df4c7a..c667cc396545 100644
--- a/include/scsi/scsi_transport_iscsi.h
+++ b/include/scsi/scsi_transport_iscsi.h
@@ -135,7 +135,8 @@ extern int iscsi_unregister_transport(struct iscsi_transport *tt);
 /*
  * control plane upcalls
  */
-extern void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error);
+extern void iscsi_conn_error_event(struct iscsi_cls_conn *conn,
+                                   enum iscsi_err error);
 extern int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
                           char *data, uint32_t data_size);
 
@@ -207,7 +208,7 @@ extern void iscsi_host_for_each_session(struct Scsi_Host *shost,
 struct iscsi_endpoint {
         void *dd_data;                  /* LLD private data */
         struct device dev;
-        unsigned int id;
+        uint64_t id;
 };
 
 /*