[SCSI] lpfc 8.2.6 : Multiple discovery fixes

Multiple Discovery Fixes:
- Fix race on discovery due to link events coinciding with vport_delete.
- Use NLP_FABRIC state to filter out switch-based pseudo initiators that
   reuse the same WWNs.
- Correct erroneous setting of DID=0 in lpfc_matchdid()
- Correct extra reference count that was in the lookup path for the
  remoteid from an unsolicited ELS.
- Correct double-free bug in els abort path.
- Correct FDMI server discovery logic for switch that return a WWN of 0.
- Fix bugs in ndlp mgmt when a node changes address
- Correct bug that did not delete RSCNs for vports upon link transitions
- Fix "0216 Link event during NS query" error which pops up when vports
  are swapped to different switch ports.
- Add sanity checks on ndlp structures
- Fix devloss log message to dump WWN correctly
- Hold off mgmt commands that were interferring with discovery mailbox cmds
- Remove unnecessary FC_ESTABLISH_LINK logic.
- Correct some race conditions in the worker thread, resulting in devloss:
  - Clear the work_port_events field before handling the work port events
  - Clear the deferred ring event before handling a deferred ring event
  - Hold the hba lock when waking up the work thread
  - Send an acc for the rscn even when we aren't going to handle it
- Fix locking behavior that was not properly protecting the ACTIVE flag,
  thus allowing mailbox command order to shift.

Signed-off-by: James Smart <james.smart@emulex.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 15 insertions, 31 deletions

diff --git a/drivers/scsi/lpfc/lpfc_ct.c b/drivers/scsi/lpfc/lpfc_ct.c
index 3d0ccd9b341d..b64dc711cd8d 100644
--- a/drivers/scsi/lpfc/lpfc_ct.c
+++ b/drivers/scsi/lpfc/lpfc_ct.c
@@ -438,7 +438,7 @@ lpfc_ns_rsp(struct lpfc_vport *vport, struct lpfc_dmabuf *mp, uint32_t Size)
 				    (!(vport->ct_flags & FC_CT_RFF_ID)) ||
 				    (!vport->cfg_restrict_login)) {
 					ndlp = lpfc_setup_disc_node(vport, Did);
-					if (ndlp) {
+					if (ndlp && NLP_CHK_NODE_ACT(ndlp)) {
 						lpfc_debugfs_disc_trc(vport,
 						LPFC_DISC_TRC_CT,
 						"Parse GID_FTrsp: "
@@ -543,7 +543,7 @@ lpfc_cmpl_ct_cmd_gid_ft(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
 	struct lpfc_dmabuf *outp;
 	struct lpfc_sli_ct_request *CTrsp;
 	struct lpfc_nodelist *ndlp;
-	int rc, retry;
+	int rc;
 
 	/* First save ndlp, before we overwrite it */
 	ndlp = cmdiocb->context_un.ndlp;
@@ -563,45 +563,29 @@ lpfc_cmpl_ct_cmd_gid_ft(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
 	if (vport->load_flag & FC_UNLOADING)
 		goto out;
 
-	if (lpfc_els_chk_latt(vport) || lpfc_error_lost_link(irsp)) {
+	if (lpfc_els_chk_latt(vport)) {
 		lpfc_printf_vlog(vport, KERN_INFO, LOG_DISCOVERY,
 				 "0216 Link event during NS query\n");
 		lpfc_vport_set_state(vport, FC_VPORT_FAILED);
 		goto out;
 	}
-
+	if (lpfc_error_lost_link(irsp)) {
+		lpfc_printf_vlog(vport, KERN_INFO, LOG_DISCOVERY,
+				 "0226 NS query failed due to link event\n");
+		goto out;
+	}
 	if (irsp->ulpStatus) {
 		/* Check for retry */
 		if (vport->fc_ns_retry < LPFC_MAX_NS_RETRY) {
-			retry = 1;
-			if (irsp->ulpStatus == IOSTAT_LOCAL_REJECT) {
-				switch (irsp->un.ulpWord[4]) {
-				case IOERR_NO_RESOURCES:
-					/* We don't increment the retry
-					 * count for this case.
-					 */
-					break;
-				case IOERR_LINK_DOWN:
-				case IOERR_SLI_ABORTED:
-				case IOERR_SLI_DOWN:
-					retry = 0;
-					break;
-				default:
-					vport->fc_ns_retry++;
-				}
-			}
-			else
+			if (irsp->ulpStatus != IOSTAT_LOCAL_REJECT ||
+			    irsp->un.ulpWord[4] != IOERR_NO_RESOURCES)
 				vport->fc_ns_retry++;
 
-			if (retry) {
-				/* CT command is being retried */
-				rc = lpfc_ns_cmd(vport, SLI_CTNS_GID_FT,
+			/* CT command is being retried */
+			rc = lpfc_ns_cmd(vport, SLI_CTNS_GID_FT,
 					 vport->fc_ns_retry, 0);
-				if (rc == 0) {
-					/* success */
-					goto out;
-				}
-			}
+			if (rc == 0)
+				goto out;
 		}
 		lpfc_vport_set_state(vport, FC_VPORT_FAILED);
 		lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
@@ -780,7 +764,7 @@ lpfc_cmpl_ct_cmd_gff_id(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
 
 	/* This is a target port, unregistered port, or the GFF_ID failed */
 	ndlp = lpfc_setup_disc_node(vport, did);
-	if (ndlp) {
+	if (ndlp && NLP_CHK_NODE_ACT(ndlp)) {
 		lpfc_printf_vlog(vport, KERN_INFO, LOG_DISCOVERY,
 				 "0242 Process x%x GFF "
 				 "NameServer Rsp Data: x%x x%x x%x\n",