[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, 21 insertions, 20 deletions

diff --git a/drivers/scsi/lpfc/lpfc_hbadisc.c b/drivers/scsi/lpfc/lpfc_hbadisc.c
index 976653440fba..7c8c3e6f399d 100644
--- a/drivers/scsi/lpfc/lpfc_hbadisc.c
+++ b/drivers/scsi/lpfc/lpfc_hbadisc.c
@@ -69,7 +69,7 @@ lpfc_terminate_rport_io(struct fc_rport *rport)
 	rdata = rport->dd_data;
 	ndlp = rdata->pnode;
 
-	if (!ndlp) {
+	if (!ndlp || !NLP_CHK_NODE_ACT(ndlp)) {
 		if (rport->roles & FC_RPORT_ROLE_FCP_TARGET)
 			printk(KERN_ERR "Cannot find remote node"
 			" to terminate I/O Data x%x\n",
@@ -114,7 +114,7 @@ lpfc_dev_loss_tmo_callbk(struct fc_rport *rport)
 
 	rdata = rport->dd_data;
 	ndlp = rdata->pnode;
-	if (!ndlp)
+	if (!ndlp || !NLP_CHK_NODE_ACT(ndlp))
 		return;
 
 	vport = ndlp->vport;
@@ -243,8 +243,8 @@ lpfc_dev_loss_tmo_handler(struct lpfc_nodelist *ndlp)
 	if (warn_on) {
 		lpfc_printf_vlog(vport, KERN_ERR, LOG_DISCOVERY,
 				 "0203 Devloss timeout on "
-				 "WWPN %x:%x:%x:%x:%x:%x:%x:%x "
-				 "NPort x%x Data: x%x x%x x%x\n",
+				 "WWPN %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x "
+				 "NPort x%06x Data: x%x x%x x%x\n",
 				 *name, *(name+1), *(name+2), *(name+3),
 				 *(name+4), *(name+5), *(name+6), *(name+7),
 				 ndlp->nlp_DID, ndlp->nlp_flag,
@@ -252,8 +252,8 @@ lpfc_dev_loss_tmo_handler(struct lpfc_nodelist *ndlp)
 	} else {
 		lpfc_printf_vlog(vport, KERN_INFO, LOG_DISCOVERY,
 				 "0204 Devloss timeout on "
-				 "WWPN %x:%x:%x:%x:%x:%x:%x:%x "
-				 "NPort x%x Data: x%x x%x x%x\n",
+				 "WWPN %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x "
+				 "NPort x%06x Data: x%x x%x x%x\n",
 				 *name, *(name+1), *(name+2), *(name+3),
 				 *(name+4), *(name+5), *(name+6), *(name+7),
 				 ndlp->nlp_DID, ndlp->nlp_flag,
@@ -399,7 +399,10 @@ lpfc_work_done(struct lpfc_hba *phba)
 				vport = vports[i];
 			if (vport == NULL)
 				break;
+			spin_lock_irq(&vport->work_port_lock);
 			work_port_events = vport->work_port_events;
+			vport->work_port_events &= ~work_port_events;
+			spin_unlock_irq(&vport->work_port_lock);
 			if (work_port_events & WORKER_DISC_TMO)
 				lpfc_disc_timeout_handler(vport);
 			if (work_port_events & WORKER_ELS_TMO)
@@ -416,9 +419,6 @@ lpfc_work_done(struct lpfc_hba *phba)
 				lpfc_ramp_down_queue_handler(phba);
 			if (work_port_events & WORKER_RAMP_UP_QUEUE)
 				lpfc_ramp_up_queue_handler(phba);
-			spin_lock_irq(&vport->work_port_lock);
-			vport->work_port_events &= ~work_port_events;
-			spin_unlock_irq(&vport->work_port_lock);
 		}
 	lpfc_destroy_vport_work_array(phba, vports);
 
@@ -430,10 +430,10 @@ lpfc_work_done(struct lpfc_hba *phba)
 		if (pring->flag & LPFC_STOP_IOCB_EVENT) {
 			pring->flag |= LPFC_DEFERRED_RING_EVENT;
 		} else {
+			pring->flag &= ~LPFC_DEFERRED_RING_EVENT;
 			lpfc_sli_handle_slow_ring_event(phba, pring,
 							(status &
 							 HA_RXMASK));
-			pring->flag &= ~LPFC_DEFERRED_RING_EVENT;
 		}
 		/*
 		 * Turn on Ring interrupts
@@ -519,7 +519,9 @@ lpfc_do_work(void *p)
 			schedule();
 		}
 	}
+	spin_lock_irq(&phba->hbalock);
 	phba->work_wait = NULL;
+	spin_unlock_irq(&phba->hbalock);
 	return 0;
 }
 
@@ -809,11 +811,9 @@ out:
 	mempool_free(pmb, phba->mbox_mem_pool);
 
 	spin_lock_irq(shost->host_lock);
-	vport->fc_flag &= ~(FC_ABORT_DISCOVERY | FC_ESTABLISH_LINK);
+	vport->fc_flag &= ~FC_ABORT_DISCOVERY;
 	spin_unlock_irq(shost->host_lock);
 
-	del_timer_sync(&phba->fc_estabtmo);
-
 	lpfc_can_disctmo(vport);
 
 	/* turn on Link Attention interrupts */
@@ -1340,10 +1340,14 @@ lpfc_mbx_cmpl_fabric_reg_login(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
 			    i++) {
 				if (vports[i]->port_type == LPFC_PHYSICAL_PORT)
 					continue;
+				if (phba->fc_topology == TOPOLOGY_LOOP) {
+					lpfc_vport_set_state(vports[i],
+							FC_VPORT_LINKDOWN);
+					continue;
+				}
 				if (phba->link_flag & LS_NPIV_FAB_SUPPORTED)
 					lpfc_initial_fdisc(vports[i]);
-				else if (phba->sli3_options &
-						LPFC_SLI3_NPIV_ENABLED) {
+				else {
 					lpfc_vport_set_state(vports[i],
 						FC_VPORT_NO_FABRIC_SUPP);
 					lpfc_printf_vlog(vport, KERN_ERR,
@@ -2190,10 +2194,6 @@ lpfc_matchdid(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
 	if (did == Bcast_DID)
 		return 0;
 
-	if (ndlp->nlp_DID == 0) {
-		return 0;
-	}
-
 	/* First check for Direct match */
 	if (ndlp->nlp_DID == did)
 		return 1;
@@ -2301,7 +2301,8 @@ lpfc_setup_disc_node(struct lpfc_vport *vport, uint32_t did)
 		return ndlp;
 	}
 
-	if (vport->fc_flag & FC_RSCN_MODE) {
+	if ((vport->fc_flag & FC_RSCN_MODE) &&
+	    !(vport->fc_flag & FC_NDISC_ACTIVE)) {
 		if (lpfc_rscn_payload_check(vport, did)) {
 			/* If we've already recieved a PLOGI from this NPort
 			 * we don't need to try to discover it again.