[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, 60 insertions, 33 deletions

diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c
index fc0d9501aba..c71b9a57777 100644
--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -2648,7 +2648,6 @@ lpfc_mbox_timeout_handler(struct lpfc_hba *phba)
 	spin_unlock_irq(&phba->pport->work_port_lock);
 	spin_lock_irq(&phba->hbalock);
 	phba->link_state = LPFC_LINK_UNKNOWN;
-	phba->pport->fc_flag |= FC_ESTABLISH_LINK;
 	psli->sli_flag &= ~LPFC_SLI2_ACTIVE;
 	spin_unlock_irq(&phba->hbalock);
 
@@ -2669,8 +2668,7 @@ lpfc_mbox_timeout_handler(struct lpfc_hba *phba)
 	lpfc_offline_prep(phba);
 	lpfc_offline(phba);
 	lpfc_sli_brdrestart(phba);
-	if (lpfc_online(phba) == 0)		/* Initialize the HBA */
-		mod_timer(&phba->fc_estabtmo, jiffies + HZ * 60);
+	lpfc_online(phba);
 	lpfc_unblock_mgmt_io(phba);
 	return;
 }
@@ -2687,28 +2685,41 @@ lpfc_sli_issue_mbox(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmbox, uint32_t flag)
 	unsigned long drvr_flag = 0;
 	volatile uint32_t word0, ldata;
 	void __iomem *to_slim;
+	int processing_queue = 0;
+
+	spin_lock_irqsave(&phba->hbalock, drvr_flag);
+	if (!pmbox) {
+		/* processing mbox queue from intr_handler */
+		processing_queue = 1;
+		phba->sli.sli_flag &= ~LPFC_SLI_MBOX_ACTIVE;
+		pmbox = lpfc_mbox_get(phba);
+		if (!pmbox) {
+			spin_unlock_irqrestore(&phba->hbalock, drvr_flag);
+			return MBX_SUCCESS;
+		}
+	}
 
 	if (pmbox->mbox_cmpl && pmbox->mbox_cmpl != lpfc_sli_def_mbox_cmpl &&
 		pmbox->mbox_cmpl != lpfc_sli_wake_mbox_wait) {
 		if(!pmbox->vport) {
+			spin_unlock_irqrestore(&phba->hbalock, drvr_flag);
 			lpfc_printf_log(phba, KERN_ERR,
 					LOG_MBOX | LOG_VPORT,
 					"1806 Mbox x%x failed. No vport\n",
 					pmbox->mb.mbxCommand);
 			dump_stack();
-			return MBX_NOT_FINISHED;
+			goto out_not_finished;
 		}
 	}
 
-
 	/* If the PCI channel is in offline state, do not post mbox. */
-	if (unlikely(pci_channel_offline(phba->pcidev)))
-		return MBX_NOT_FINISHED;
+	if (unlikely(pci_channel_offline(phba->pcidev))) {
+		spin_unlock_irqrestore(&phba->hbalock, drvr_flag);
+		goto out_not_finished;
+	}
 
-	spin_lock_irqsave(&phba->hbalock, drvr_flag);
 	psli = &phba->sli;
 
-
 	mb = &pmbox->mb;
 	status = MBX_SUCCESS;
 
@@ -2717,14 +2728,14 @@ lpfc_sli_issue_mbox(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmbox, uint32_t flag)
 
 		/* Mbox command <mbxCommand> cannot issue */
 		LOG_MBOX_CANNOT_ISSUE_DATA(phba, pmbox, psli, flag);
-		return MBX_NOT_FINISHED;
+		goto out_not_finished;
 	}
 
 	if (mb->mbxCommand != MBX_KILL_BOARD && flag & MBX_NOWAIT &&
 	    !(readl(phba->HCregaddr) & HC_MBINT_ENA)) {
 		spin_unlock_irqrestore(&phba->hbalock, drvr_flag);
 		LOG_MBOX_CANNOT_ISSUE_DATA(phba, pmbox, psli, flag);
-		return MBX_NOT_FINISHED;
+		goto out_not_finished;
 	}
 
 	if (psli->sli_flag & LPFC_SLI_MBOX_ACTIVE) {
@@ -2738,14 +2749,14 @@ lpfc_sli_issue_mbox(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmbox, uint32_t flag)
 
 			/* Mbox command <mbxCommand> cannot issue */
 			LOG_MBOX_CANNOT_ISSUE_DATA(phba, pmbox, psli, flag);
-			return MBX_NOT_FINISHED;
+			goto out_not_finished;
 		}
 
 		if (!(psli->sli_flag & LPFC_SLI2_ACTIVE)) {
 			spin_unlock_irqrestore(&phba->hbalock, drvr_flag);
 			/* Mbox command <mbxCommand> cannot issue */
 			LOG_MBOX_CANNOT_ISSUE_DATA(phba, pmbox, psli, flag);
-			return MBX_NOT_FINISHED;
+			goto out_not_finished;
 		}
 
 		/* Another mailbox command is still being processed, queue this
@@ -2792,7 +2803,7 @@ lpfc_sli_issue_mbox(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmbox, uint32_t flag)
 			spin_unlock_irqrestore(&phba->hbalock, drvr_flag);
 			/* Mbox command <mbxCommand> cannot issue */
 			LOG_MBOX_CANNOT_ISSUE_DATA(phba, pmbox, psli, flag);
-			return MBX_NOT_FINISHED;
+			goto out_not_finished;
 		}
 		/* timeout active mbox command */
 		mod_timer(&psli->mbox_tmo, (jiffies +
@@ -2900,7 +2911,7 @@ lpfc_sli_issue_mbox(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmbox, uint32_t flag)
 				psli->sli_flag &= ~LPFC_SLI_MBOX_ACTIVE;
 				spin_unlock_irqrestore(&phba->hbalock,
 						       drvr_flag);
-				return MBX_NOT_FINISHED;
+				goto out_not_finished;
 			}
 
 			/* Check if we took a mbox interrupt while we were
@@ -2967,6 +2978,13 @@ lpfc_sli_issue_mbox(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmbox, uint32_t flag)
 
 	spin_unlock_irqrestore(&phba->hbalock, drvr_flag);
 	return status;
+
+out_not_finished:
+	if (processing_queue) {
+		pmbox->mb.mbxStatus = MBX_NOT_FINISHED;
+		lpfc_mbox_cmpl_put(phba, pmbox);
+	}
+	return MBX_NOT_FINISHED;
 }
 
 /*
@@ -3613,6 +3631,16 @@ lpfc_sli_abort_els_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
 				irsp->ulpStatus, irsp->un.ulpWord[4]);
 
 		/*
+		 *  If the iocb is not found in Firmware queue the iocb
+		 *  might have completed already. Do not free it again.
+		 */
+		if ((irsp->ulpStatus == IOSTAT_LOCAL_REJECT) &&
+			(irsp->un.ulpWord[4] == IOERR_NO_XRI)) {
+			spin_unlock_irq(&phba->hbalock);
+			lpfc_sli_release_iocbq(phba, cmdiocb);
+			return;
+		}
+		/*
 		 * make sure we have the right iocbq before taking it
 		 * off the txcmplq and try to call completion routine.
 		 */
@@ -4237,10 +4265,15 @@ lpfc_intr_handler(int irq, void *dev_id)
 						pmb->context1 = mp;
 						pmb->context2 = ndlp;
 						pmb->vport = vport;
-						spin_lock(&phba->hbalock);
-						phba->sli.sli_flag &=
-							~LPFC_SLI_MBOX_ACTIVE;
-						spin_unlock(&phba->hbalock);
+						rc = lpfc_sli_issue_mbox(phba,
+								pmb,
+								MBX_NOWAIT);
+						if (rc != MBX_BUSY)
+							lpfc_printf_log(phba,
+							KERN_ERR,
+							LOG_MBOX | LOG_SLI,
+							"0306 rc should have"
+							"been MBX_BUSY");
 						goto send_current_mbox;
 					}
 				}
@@ -4253,22 +4286,16 @@ lpfc_intr_handler(int irq, void *dev_id)
 		}
 		if ((work_ha_copy & HA_MBATT) &&
 		    (phba->sli.mbox_active == NULL)) {
-send_next_mbox:
-			spin_lock(&phba->hbalock);
-			phba->sli.sli_flag &= ~LPFC_SLI_MBOX_ACTIVE;
-			pmb = lpfc_mbox_get(phba);
-			spin_unlock(&phba->hbalock);
 send_current_mbox:
 			/* Process next mailbox command if there is one */
-			if (pmb != NULL) {
-				rc = lpfc_sli_issue_mbox(phba, pmb, MBX_NOWAIT);
-				if (rc == MBX_NOT_FINISHED) {
-					pmb->mb.mbxStatus = MBX_NOT_FINISHED;
-					lpfc_mbox_cmpl_put(phba, pmb);
-					goto send_next_mbox;
-				}
-			}
-
+			do {
+				rc = lpfc_sli_issue_mbox(phba, NULL,
+							 MBX_NOWAIT);
+			} while (rc == MBX_NOT_FINISHED);
+			if (rc != MBX_SUCCESS)
+				lpfc_printf_log(phba, KERN_ERR, LOG_MBOX |
+						LOG_SLI, "0349 rc should be "
+						"MBX_SUCCESS");
 		}
 
 		spin_lock(&phba->hbalock);