scsi: lpfc: Improve PCI EEH Error and Recovery Handling

Following EEH errors, the driver can crash or hang when deleting the
localport or when attempting to unload.

The EEH handlers in the driver did not notify the NVMe-FC transport before
tearing the driver down. This was delayed until the resume steps. This
worked for SCSI because lpfc_block_scsi() would notify the
scsi_fc_transport that the target was not available but it would not clean
up all the references to the ndlp.

The SLI3 prep for dev reset handler did the lpfc_offline_prep() and
lpfc_offline() calls to get the port stopped before restarting. The SLI4
version of the prep for dev reset just destroyed the queues and did not
stop NVMe from continuing.  Also because the port was not really stopped
the localport destroy would hang because the transport was still waiting
for I/O. Additionally, a devloss tmo can fire and post events to a stopped
worker thread creating another hang condition.

lpfc_sli4_prep_dev_for_reset() is modified to call lpfc_offline_prep() and
lpfc_offline() rather than just lpfc_scsi_dev_block() to ensure both SCSI
and NVMe transports are notified to block I/O to the driver.

Logic is added to devloss handler and worker thread to clean up ndlp
references and quiesce appropriately.

Link: https://lore.kernel.org/r/20220317032737.45308-2-jsmart2021@gmail.com
Co-developed-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 10 insertions, 5 deletions

diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c
index 20d40957a385..26f6a147b5ae 100644
--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -2828,6 +2828,12 @@ __lpfc_sli_rpi_release(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp)
 	ndlp->nlp_flag &= ~NLP_UNREG_INP;
 }
 
+void
+lpfc_sli_rpi_release(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp)
+{
+	__lpfc_sli_rpi_release(vport, ndlp);
+}
+
 /**
  * lpfc_sli_def_mbox_cmpl - Default mailbox completion handler
  * @phba: Pointer to HBA context object.
@@ -4624,11 +4630,6 @@ lpfc_sli_flush_io_rings(struct lpfc_hba *phba)
 	struct lpfc_iocbq *piocb, *next_iocb;
 
 	spin_lock_irq(&phba->hbalock);
-	if (phba->hba_flag & HBA_IOQ_FLUSH ||
-	    !phba->sli4_hba.hdwq) {
-		spin_unlock_irq(&phba->hbalock);
-		return;
-	}
 	/* Indicate the I/O queues are flushed */
 	phba->hba_flag |= HBA_IOQ_FLUSH;
 	spin_unlock_irq(&phba->hbalock);
@@ -10997,6 +10998,10 @@ lpfc_sli_issue_iocb(struct lpfc_hba *phba, uint32_t ring_number,
 	unsigned long iflags;
 	int rc;
 
+	/* If the PCI channel is in offline state, do not post iocbs. */
+	if (unlikely(pci_channel_offline(phba->pcidev)))
+		return IOCB_ERROR;
+
 	if (phba->sli_rev == LPFC_SLI_REV4) {
 		lpfc_sli_prep_wqe(phba, piocb);