[SCSI] iscsi: remove session and host binding in libiscsi

bnx2i allocates a host per netdevice but will use libiscsi,
so this unbinds the session from the host in that code.

This will also be useful for the iser parent device dma settings
fixes.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 94 insertions, 119 deletions

diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index 01a1a4d36f21..64b1dd827366 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -38,14 +38,6 @@
 #include <scsi/scsi_transport_iscsi.h>
 #include <scsi/libiscsi.h>
 
-struct iscsi_session *
-class_to_transport_session(struct iscsi_cls_session *cls_session)
-{
-        struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
-        return iscsi_hostdata(shost->hostdata);
-}
-EXPORT_SYMBOL_GPL(class_to_transport_session);
-
 /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
 #define SNA32_CHECK 2147483648UL
 
@@ -1096,6 +1088,7 @@ enum {
 
 int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
 {
+        struct iscsi_cls_session *cls_session;
         struct Scsi_Host *host;
         int reason = 0;
         struct iscsi_session *session;
@@ -1109,10 +1102,11 @@ int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
         host = sc->device->host;
         spin_unlock(host->host_lock);
 
-        session = iscsi_hostdata(host->hostdata);
+        cls_session = starget_to_session(scsi_target(sc->device));
+        session = cls_session->dd_data;
         spin_lock(&session->lock);
 
-        reason = iscsi_session_chkready(session_to_cls(session));
+        reason = iscsi_session_chkready(cls_session);
         if (reason) {
                 sc->result = reason;
                 goto fault;
@@ -1222,7 +1216,7 @@ EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
 
 void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
 {
-        struct iscsi_session *session = class_to_transport_session(cls_session);
+        struct iscsi_session *session = cls_session->dd_data;
 
         spin_lock_bh(&session->lock);
         if (session->state != ISCSI_STATE_LOGGED_IN) {
@@ -1236,9 +1230,13 @@ EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
 
 int iscsi_eh_host_reset(struct scsi_cmnd *sc)
 {
-        struct Scsi_Host *host = sc->device->host;
-        struct iscsi_session *session = iscsi_hostdata(host->hostdata);
-        struct iscsi_conn *conn = session->leadconn;
+        struct iscsi_cls_session *cls_session;
+        struct iscsi_session *session;
+        struct iscsi_conn *conn;
+
+        cls_session = starget_to_session(scsi_target(sc->device));
+        session = cls_session->dd_data;
+        conn = session->leadconn;
 
         mutex_lock(&session->eh_mutex);
         spin_lock_bh(&session->lock);
@@ -1405,7 +1403,7 @@ static enum scsi_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *scmd)
         enum scsi_eh_timer_return rc = EH_NOT_HANDLED;
 
         cls_session = starget_to_session(scsi_target(scmd->device));
-        session = class_to_transport_session(cls_session);
+        session = cls_session->dd_data;
 
         debug_scsi("scsi cmd %p timedout\n", scmd);
 
@@ -1507,13 +1505,16 @@ static void iscsi_prep_abort_task_pdu(struct iscsi_cmd_task *ctask,
 
 int iscsi_eh_abort(struct scsi_cmnd *sc)
 {
-        struct Scsi_Host *host = sc->device->host;
-        struct iscsi_session *session = iscsi_hostdata(host->hostdata);
+        struct iscsi_cls_session *cls_session;
+        struct iscsi_session *session;
         struct iscsi_conn *conn;
         struct iscsi_cmd_task *ctask;
         struct iscsi_tm *hdr;
         int rc, age;
 
+        cls_session = starget_to_session(scsi_target(sc->device));
+        session = cls_session->dd_data;
+
         mutex_lock(&session->eh_mutex);
         spin_lock_bh(&session->lock);
         /*
@@ -1630,12 +1631,15 @@ static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
 
 int iscsi_eh_device_reset(struct scsi_cmnd *sc)
 {
-        struct Scsi_Host *host = sc->device->host;
-        struct iscsi_session *session = iscsi_hostdata(host->hostdata);
+        struct iscsi_cls_session *cls_session;
+        struct iscsi_session *session;
         struct iscsi_conn *conn;
         struct iscsi_tm *hdr;
         int rc = FAILED;
 
+        cls_session = starget_to_session(scsi_target(sc->device));
+        session = cls_session->dd_data;
+
         debug_scsi("LU Reset [sc %p lun %u]\n", sc, sc->device->lun);
 
         mutex_lock(&session->eh_mutex);
@@ -1760,55 +1764,53 @@ void iscsi_pool_free(struct iscsi_pool *q)
 }
 EXPORT_SYMBOL_GPL(iscsi_pool_free);
 
-/*
- * iSCSI Session's hostdata organization:
- *
- *    *------------------* <== hostdata_session(host->hostdata)
- *    | ptr to class sess|
- *    |------------------| <== iscsi_hostdata(host->hostdata)
- *    | iscsi_session    |
- *    *------------------*
- */
+void iscsi_host_setup(struct Scsi_Host *shost, uint16_t qdepth)
+{
+        if (qdepth > ISCSI_MAX_CMD_PER_LUN || qdepth < 1) {
+                if (qdepth != 0)
+                        printk(KERN_ERR "iscsi: invalid queue depth of %d. "
+                               "Queue depth must be between 1 and %d.\n",
+                               qdepth, ISCSI_MAX_CMD_PER_LUN);
+                qdepth = ISCSI_DEF_CMD_PER_LUN;
+        }
+
+        shost->transportt->create_work_queue = 1;
+        shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
+        shost->cmd_per_lun = qdepth;
+}
+EXPORT_SYMBOL_GPL(iscsi_host_setup);
 
-#define hostdata_privsize(_sz)  (sizeof(unsigned long) + _sz + \
-                                 _sz % sizeof(unsigned long))
+void iscsi_host_teardown(struct Scsi_Host *shost)
+{
+        struct iscsi_host *ihost = shost_priv(shost);
 
-#define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
+        kfree(ihost->netdev);
+        kfree(ihost->hwaddress);
+        kfree(ihost->initiatorname);
+}
+EXPORT_SYMBOL_GPL(iscsi_host_teardown);
 
 /**
  * iscsi_session_setup - create iscsi cls session and host and session
- * @scsit: scsi transport template
  * @iscsit: iscsi transport template
- * @cmds_max: scsi host can queue
- * @qdepth: scsi host cmds per lun
+ * @shost: scsi host
+ * @cmds_max: session can queue
  * @cmd_task_size: LLD ctask private data size
  * @mgmt_task_size: LLD mtask private data size
  * @initial_cmdsn: initial CmdSN
- * @hostno: host no allocated
  *
  * This can be used by software iscsi_transports that allocate
  * a session per scsi host.
- **/
+ */
 struct iscsi_cls_session *
-iscsi_session_setup(struct iscsi_transport *iscsit,
-                    struct scsi_transport_template *scsit,
-                    uint16_t cmds_max, uint16_t qdepth,
-                    int cmd_task_size, int mgmt_task_size,
-                    uint32_t initial_cmdsn, uint32_t *hostno)
+iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
+                    uint16_t cmds_max, int cmd_task_size, int mgmt_task_size,
+                    uint32_t initial_cmdsn)
 {
-        struct Scsi_Host *shost;
         struct iscsi_session *session;
         struct iscsi_cls_session *cls_session;
         int cmd_i;
 
-        if (qdepth > ISCSI_MAX_CMD_PER_LUN || qdepth < 1) {
-                if (qdepth != 0)
-                        printk(KERN_ERR "iscsi: invalid queue depth of %d. "
-                              "Queue depth must be between 1 and %d.\n",
-                              qdepth, ISCSI_MAX_CMD_PER_LUN);
-                qdepth = ISCSI_DEF_CMD_PER_LUN;
-        }
-
         if (!is_power_of_2(cmds_max) || cmds_max >= ISCSI_MGMT_ITT_OFFSET ||
             cmds_max < 2) {
                 if (cmds_max != 0)
@@ -1819,25 +1821,11 @@ iscsi_session_setup(struct iscsi_transport *iscsit,
                 cmds_max = ISCSI_DEF_XMIT_CMDS_MAX;
         }
 
-        shost = scsi_host_alloc(iscsit->host_template,
-                                hostdata_privsize(sizeof(*session)));
-        if (!shost)
+        cls_session = iscsi_alloc_session(shost, iscsit);
+        if (!cls_session)
                 return NULL;
-
-        /* the iscsi layer takes one task for reserve */
-        shost->can_queue = cmds_max - 1;
-        shost->cmd_per_lun = qdepth;
-        shost->max_id = 1;
-        shost->max_channel = 0;
-        shost->max_lun = iscsit->max_lun;
-        shost->max_cmd_len = 16;
-        shost->transportt = scsit;
-        shost->transportt->create_work_queue = 1;
-        shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
-        *hostno = shost->host_no;
-
-        session = iscsi_hostdata(shost->hostdata);
-        memset(session, 0, sizeof(struct iscsi_session));
+        session = cls_session->dd_data;
+        session->cls_session = cls_session;
         session->host = shost;
         session->state = ISCSI_STATE_FREE;
         session->fast_abort = 1;
@@ -1851,6 +1839,7 @@ iscsi_session_setup(struct iscsi_transport *iscsit,
         session->max_r2t = 1;
         session->tt = iscsit;
         mutex_init(&session->eh_mutex);
+        spin_lock_init(&session->lock);
 
         /* initialize SCSI PDU commands pool */
         if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
@@ -1868,8 +1857,6 @@ iscsi_session_setup(struct iscsi_transport *iscsit,
                 INIT_LIST_HEAD(&ctask->running);
         }
 
-        spin_lock_init(&session->lock);
-
         /* initialize immediate command pool */
         if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
                            (void***)&session->mgmt_cmds,
@@ -1887,49 +1874,37 @@ iscsi_session_setup(struct iscsi_transport *iscsit,
                 INIT_LIST_HEAD(&mtask->running);
         }
 
-        if (scsi_add_host(shost, NULL))
-                goto add_host_fail;
-
         if (!try_module_get(iscsit->owner))
-                goto cls_session_fail;
-
-        cls_session = iscsi_create_session(shost, iscsit, 0);
-        if (!cls_session)
-                goto module_put;
-        *(unsigned long*)shost->hostdata = (unsigned long)cls_session;
+                goto module_get_fail;
 
+        if (iscsi_add_session(cls_session, 0))
+                goto cls_session_fail;
         return cls_session;
 
-module_put:
-        module_put(iscsit->owner);
 cls_session_fail:
-        scsi_remove_host(shost);
-add_host_fail:
+        module_put(iscsit->owner);
+module_get_fail:
         iscsi_pool_free(&session->mgmtpool);
 mgmtpool_alloc_fail:
         iscsi_pool_free(&session->cmdpool);
 cmdpool_alloc_fail:
-        scsi_host_put(shost);
+        iscsi_free_session(cls_session);
         return NULL;
 }
 EXPORT_SYMBOL_GPL(iscsi_session_setup);
 
 /**
  * iscsi_session_teardown - destroy session, host, and cls_session
- * shost: scsi host
+ * @cls_session: iscsi session
  *
- * This can be used by software iscsi_transports that allocate
- * a session per scsi host.
- **/
+ * The driver must have called iscsi_remove_session before
+ * calling this.
+ */
 void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
 {
-        struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
-        struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
+        struct iscsi_session *session = cls_session->dd_data;
         struct module *owner = cls_session->transport->owner;
 
-        iscsi_remove_session(cls_session);
-        scsi_remove_host(shost);
-
         iscsi_pool_free(&session->mgmtpool);
         iscsi_pool_free(&session->cmdpool);
 
@@ -1938,12 +1913,8 @@ void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
         kfree(session->username);
         kfree(session->username_in);
         kfree(session->targetname);
-        kfree(session->netdev);
-        kfree(session->hwaddress);
-        kfree(session->initiatorname);
 
-        iscsi_free_session(cls_session);
-        scsi_host_put(shost);
+        iscsi_destroy_session(cls_session);
         module_put(owner);
 }
 EXPORT_SYMBOL_GPL(iscsi_session_teardown);
@@ -1956,7 +1927,7 @@ EXPORT_SYMBOL_GPL(iscsi_session_teardown);
 struct iscsi_cls_conn *
 iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
 {
-        struct iscsi_session *session = class_to_transport_session(cls_session);
+        struct iscsi_session *session = cls_session->dd_data;
         struct iscsi_conn *conn;
         struct iscsi_cls_conn *cls_conn;
         char *data;
@@ -2140,7 +2111,7 @@ int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
         }
         spin_unlock_bh(&session->lock);
 
-        iscsi_unblock_session(session_to_cls(session));
+        iscsi_unblock_session(session->cls_session);
         wake_up(&conn->ehwait);
         return 0;
 }
@@ -2225,7 +2196,7 @@ static void iscsi_start_session_recovery(struct iscsi_session *session,
                 if (session->state == ISCSI_STATE_IN_RECOVERY &&
                     old_stop_stage != STOP_CONN_RECOVER) {
                         debug_scsi("blocking session\n");
-                        iscsi_block_session(session_to_cls(session));
+                        iscsi_block_session(session->cls_session);
                 }
         }
 
@@ -2260,7 +2231,7 @@ EXPORT_SYMBOL_GPL(iscsi_conn_stop);
 int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
                     struct iscsi_cls_conn *cls_conn, int is_leading)
 {
-        struct iscsi_session *session = class_to_transport_session(cls_session);
+        struct iscsi_session *session = cls_session->dd_data;
         struct iscsi_conn *conn = cls_conn->dd_data;
 
         spin_lock_bh(&session->lock);
@@ -2410,8 +2381,7 @@ EXPORT_SYMBOL_GPL(iscsi_set_param);
 int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
                             enum iscsi_param param, char *buf)
 {
-        struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
-        struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
+        struct iscsi_session *session = cls_session->dd_data;
         int len;
 
         switch(param) {
@@ -2525,29 +2495,34 @@ EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
 int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
                          char *buf)
 {
-        struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
+        struct iscsi_host *ihost = shost_priv(shost);
         int len;
 
         switch (param) {
         case ISCSI_HOST_PARAM_NETDEV_NAME:
-                if (!session->netdev)
+                if (!ihost->netdev)
                         len = sprintf(buf, "%s\n", "default");
                 else
-                        len = sprintf(buf, "%s\n", session->netdev);
+                        len = sprintf(buf, "%s\n", ihost->netdev);
                 break;
         case ISCSI_HOST_PARAM_HWADDRESS:
-                if (!session->hwaddress)
+                if (!ihost->hwaddress)
                         len = sprintf(buf, "%s\n", "default");
                 else
-                        len = sprintf(buf, "%s\n", session->hwaddress);
+                        len = sprintf(buf, "%s\n", ihost->hwaddress);
                 break;
         case ISCSI_HOST_PARAM_INITIATOR_NAME:
-                if (!session->initiatorname)
+                if (!ihost->initiatorname)
                         len = sprintf(buf, "%s\n", "unknown");
                 else
-                        len = sprintf(buf, "%s\n", session->initiatorname);
+                        len = sprintf(buf, "%s\n", ihost->initiatorname);
                 break;
-
+        case ISCSI_HOST_PARAM_IPADDRESS:
+                if (!strlen(ihost->local_address))
+                        len = sprintf(buf, "%s\n", "unknown");
+                else
+                        len = sprintf(buf, "%s\n",
+                                      ihost->local_address);
         default:
                 return -ENOSYS;
         }
@@ -2559,20 +2534,20 @@ EXPORT_SYMBOL_GPL(iscsi_host_get_param);
 int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
                          char *buf, int buflen)
 {
-        struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
+        struct iscsi_host *ihost = shost_priv(shost);
 
         switch (param) {
         case ISCSI_HOST_PARAM_NETDEV_NAME:
-                if (!session->netdev)
-                        session->netdev = kstrdup(buf, GFP_KERNEL);
+                if (!ihost->netdev)
+                        ihost->netdev = kstrdup(buf, GFP_KERNEL);
                 break;
         case ISCSI_HOST_PARAM_HWADDRESS:
-                if (!session->hwaddress)
-                        session->hwaddress = kstrdup(buf, GFP_KERNEL);
+                if (!ihost->hwaddress)
+                        ihost->hwaddress = kstrdup(buf, GFP_KERNEL);
                 break;
         case ISCSI_HOST_PARAM_INITIATOR_NAME:
-                if (!session->initiatorname)
-                        session->initiatorname = kstrdup(buf, GFP_KERNEL);
+                if (!ihost->initiatorname)
+                        ihost->initiatorname = kstrdup(buf, GFP_KERNEL);
                 break;
         default:
                 return -ENOSYS;