[SCSI] libfc: Register Symbolic Port Name (RSPN_ID)

Register the fc_host symbolic name as the symbolic port name
with the fabric name server.

Signed-off-by: Chris Leech <christopher.leech@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

4 files changed, 112 insertions, 0 deletions

diff --git a/drivers/scsi/libfc/fc_lport.c b/drivers/scsi/libfc/fc_lport.c
index cc389c03f698..28a35da1493b 100644
--- a/drivers/scsi/libfc/fc_lport.c
+++ b/drivers/scsi/libfc/fc_lport.c
@@ -110,6 +110,7 @@ static void fc_lport_enter_flogi(struct fc_lport *);
 static void fc_lport_enter_dns(struct fc_lport *);
 static void fc_lport_enter_rnn_id(struct fc_lport *);
 static void fc_lport_enter_rsnn_nn(struct fc_lport *);
+static void fc_lport_enter_rspn_id(struct fc_lport *);
 static void fc_lport_enter_rft_id(struct fc_lport *);
 static void fc_lport_enter_scr(struct fc_lport *);
 static void fc_lport_enter_ready(struct fc_lport *);
@@ -121,6 +122,7 @@ static const char *fc_lport_state_names[] = {
         [LPORT_ST_DNS] =      "dNS",
         [LPORT_ST_RNN_ID] =   "RNN_ID",
         [LPORT_ST_RSNN_NN] =  "RSNN_NN",
+        [LPORT_ST_RSPN_ID] =  "RSPN_ID",
         [LPORT_ST_RFT_ID] =   "RFT_ID",
         [LPORT_ST_SCR] =      "SCR",
         [LPORT_ST_READY] =    "Ready",
@@ -969,6 +971,7 @@ static void fc_lport_error(struct fc_lport *lport, struct fc_frame *fp)
                         case LPORT_ST_RESET:
                         case LPORT_ST_RNN_ID:
                         case LPORT_ST_RSNN_NN:
+                        case LPORT_ST_RSPN_ID:
                         case LPORT_ST_RFT_ID:
                         case LPORT_ST_SCR:
                         case LPORT_ST_DNS:
@@ -1036,6 +1039,59 @@ err:
 }
 
 /**
+ * fc_lport_rspn_id_resp() - Handle response to Register Symbolic Port Name
+ *                           by ID (RSPN_ID) request
+ * @sp: current sequence in RSPN_ID exchange
+ * @fp: response frame
+ * @lp_arg: Fibre Channel host port instance
+ *
+ * Locking Note: This function will be called without the lport lock
+ * held, but it will lock, call an _enter_* function or fc_lport_error
+ * and then unlock the lport.
+ */
+static void fc_lport_rspn_id_resp(struct fc_seq *sp, struct fc_frame *fp,
+                                  void *lp_arg)
+{
+        struct fc_lport *lport = lp_arg;
+        struct fc_frame_header *fh;
+        struct fc_ct_hdr *ct;
+
+        FC_LPORT_DBG(lport, "Received a RSPN_ID %s\n", fc_els_resp_type(fp));
+
+        if (fp == ERR_PTR(-FC_EX_CLOSED))
+                return;
+
+        mutex_lock(&lport->lp_mutex);
+
+        if (lport->state != LPORT_ST_RSPN_ID) {
+                FC_LPORT_DBG(lport, "Received a RSPN_ID response, but in state "
+                             "%s\n", fc_lport_state(lport));
+                if (IS_ERR(fp))
+                        goto err;
+                goto out;
+        }
+
+        if (IS_ERR(fp)) {
+                fc_lport_error(lport, fp);
+                goto err;
+        }
+
+        fh = fc_frame_header_get(fp);
+        ct = fc_frame_payload_get(fp, sizeof(*ct));
+        if (fh && ct && fh->fh_type == FC_TYPE_CT &&
+            ct->ct_fs_type == FC_FST_DIR &&
+            ct->ct_fs_subtype == FC_NS_SUBTYPE &&
+            ntohs(ct->ct_cmd) == FC_FS_ACC)
+                fc_lport_enter_rspn_id(lport);
+        else
+                fc_lport_error(lport, fp);
+
+out:
+        fc_frame_free(fp);
+err:
+        mutex_unlock(&lport->lp_mutex);
+}
+/**
  * fc_lport_rsnn_nn_resp() - Handle response to Register Symbolic Node Name
  *                           by Node Name (RSNN_NN) request
  * @sp: current sequence in RSNN_NN exchange
@@ -1261,6 +1317,37 @@ static void fc_lport_enter_rft_id(struct fc_lport *lport)
 }
 
 /**
+ * fc_rport_enter_rspn_id() - Register symbolic port name with the name server
+ * @lport: Fibre Channel local port to register
+ *
+ * Locking Note: The lport lock is expected to be held before calling
+ * this routine.
+ */
+static void fc_lport_enter_rspn_id(struct fc_lport *lport)
+{
+        struct fc_frame *fp;
+        size_t len;
+
+        FC_LPORT_DBG(lport, "Entered RSPN_ID state from %s state\n",
+                     fc_lport_state(lport));
+
+        fc_lport_state_enter(lport, LPORT_ST_RSPN_ID);
+
+        len = strnlen(fc_host_symbolic_name(lport->host), 255);
+        fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) +
+                            sizeof(struct fc_ns_rspn) + len);
+        if (!fp) {
+                fc_lport_error(lport, fp);
+                return;
+        }
+
+        if (!lport->tt.elsct_send(lport, FC_FID_DIR_SERV, fp, FC_NS_RSPN_ID,
+                                  fc_lport_rspn_id_resp,
+                                  lport, lport->e_d_tov))
+                fc_lport_error(lport, fp);
+}
+
+/**
  * fc_rport_enter_rsnn_nn() - Register symbolic node name with the name server
  * @lport: Fibre Channel local port to register
  *
@@ -1387,6 +1474,9 @@ static void fc_lport_timeout(struct work_struct *work)
         case LPORT_ST_RSNN_NN:
                 fc_lport_enter_rsnn_nn(lport);
                 break;
+        case LPORT_ST_RSPN_ID:
+                fc_lport_enter_rspn_id(lport);
+                break;
         case LPORT_ST_RFT_ID:
                 fc_lport_enter_rft_id(lport);
                 break;
diff --git a/include/scsi/fc/fc_ns.h b/include/scsi/fc/fc_ns.h
index fa8283056325..3fd59a2cb81f 100644
--- a/include/scsi/fc/fc_ns.h
+++ b/include/scsi/fc/fc_ns.h
@@ -47,6 +47,7 @@ enum fc_ns_req {
         FC_NS_RFT_ID =  0x0217,         /* reg FC4 type for ID */
         FC_NS_RPN_ID =  0x0212,         /* reg port name for ID */
         FC_NS_RNN_ID =  0x0213,         /* reg node name for ID */
+        FC_NS_RSPN_ID = 0x0218,         /* reg symbolic port name */
         FC_NS_RSNN_NN = 0x0239,         /* reg symbolic node name */
 };
 
@@ -166,4 +167,13 @@ struct fc_ns_rsnn {
         char            fr_name[];
 } __attribute__((__packed__));
 
+/*
+ * RSPN_ID request - register symbolic port name
+ */
+struct fc_ns_rspn {
+        struct fc_ns_fid fr_fid;        /* port ID object */
+        __u8            fr_name_len;
+        char            fr_name[];
+} __attribute__((__packed__));
+
 #endif /* _FC_NS_H_ */
diff --git a/include/scsi/fc_encode.h b/include/scsi/fc_encode.h
index 89981afba72d..9afcbb94ec30 100644
--- a/include/scsi/fc_encode.h
+++ b/include/scsi/fc_encode.h
@@ -34,6 +34,7 @@ struct fc_ct_req {
                 struct fc_ns_rft rft;
                 struct fc_ns_fid fid;
                 struct fc_ns_rsnn snn;
+                struct fc_ns_rspn spn;
         } payload;
 };
 
@@ -137,6 +138,16 @@ static inline int fc_ct_fill(struct fc_lport *lport,
                 put_unaligned_be64(lport->wwnn, &ct->payload.rn.fr_wwn);
                 break;
 
+        case FC_NS_RSPN_ID:
+                ct = fc_ct_hdr_fill(fp, op, sizeof(struct fc_ns_rspn));
+                hton24(ct->payload.spn.fr_fid.fp_fid,
+                       fc_host_port_id(lport->host));
+                strncpy(ct->payload.spn.fr_name,
+                        fc_host_symbolic_name(lport->host), 255);
+                ct->payload.spn.fr_name_len =
+                        strnlen(ct->payload.spn.fr_name, 255);
+                break;
+
         case FC_NS_RSNN_NN:
                 ct = fc_ct_hdr_fill(fp, op, sizeof(struct fc_ns_rsnn));
                 put_unaligned_be64(lport->wwnn, &ct->payload.snn.fr_wwn);
diff --git a/include/scsi/libfc.h b/include/scsi/libfc.h
index 1a632069c402..8258edfa328c 100644
--- a/include/scsi/libfc.h
+++ b/include/scsi/libfc.h
@@ -63,6 +63,7 @@ enum fc_lport_state {
         LPORT_ST_DNS,
         LPORT_ST_RNN_ID,
         LPORT_ST_RSNN_NN,
+        LPORT_ST_RSPN_ID,
         LPORT_ST_RFT_ID,
         LPORT_ST_SCR,
         LPORT_ST_READY,