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scsi: lpfc: Defer issuing new PLOGI if received RSCN before completing REG_LOGIN

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When mapped to a target with multiple virtual ports, a link bounce
sometimes results in unsuccessful rediscovery of all of the target's
virtual ports.  This is because a succession of repeat RSCNs for the
virtual target ports leaves ndlps in the REG_LOGIN state with the
NLP_REG_LOGIN_SEND flag set.  With NLP_REG_LOGIN_SEND set, during the next
PLOGI, the driver will UNREG_RPI.  When UNREG_RPI is processed, the driver
can be in the middle of PRLI_ISSUE or MAPPED state resulting in an illegal
state transition by the discovery engine and stalling.

Fix by calling the discovery state machine with DEVICE_RECOVERY event
during RSCN processing.  This will set the NLP_IGNR_REG_CMPL bit and
prevent the old REG_LOGIN state from advancing.  Then for the new PLOGI
issue, add the check for the NLP_IGNR_REG_CMPL bit to delay issuing the new
PLOGI until the queued REG_LOGIN and UNREG_LOGIN have been processed.

Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Link: https://lore.kernel.org/r/20230301231626.9621-6-justintee8345@gmail.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Justin Tee 2023-03-01 15:16:21 -08:00 committed by Martin K. Petersen
parent 06578ac65e
commit 1d0f9fea5d
2 changed files with 6 additions and 5 deletions
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7
drivers/scsi/lpfc/lpfc_els.c
View File

@ -2208,14 +2208,15 @@ lpfc_issue_els_plogi(struct lpfc_vport *vport, uint32_t did, uint8_t retry)
* outstanding UNREG_RPI mbox command completes, unless we
* are going offline. This logic does not apply for Fabric DIDs
*/
if ((ndlp->nlp_flag & NLP_UNREG_INP) &&
if ((ndlp->nlp_flag & (NLP_IGNR_REG_CMPL | NLP_UNREG_INP)) &&
((ndlp->nlp_DID & Fabric_DID_MASK) != Fabric_DID_MASK) &&
!(vport->fc_flag & FC_OFFLINE_MODE)) {
lpfc_printf_vlog(vport, KERN_INFO, LOG_DISCOVERY,
"4110 Issue PLOGI x%x deferred "
"on NPort x%x rpi x%x Data: x%px\n",
"on NPort x%x rpi x%x flg x%x Data:"
" x%px\n",
ndlp->nlp_defer_did, ndlp->nlp_DID,
ndlp->nlp_rpi, ndlp);
ndlp->nlp_rpi, ndlp->nlp_flag, ndlp);
/* We can only defer 1st PLOGI */
if (ndlp->nlp_defer_did == NLP_EVT_NOTHING_PENDING)

4
drivers/scsi/lpfc/lpfc_hbadisc.c
View File

@ -5755,8 +5755,8 @@ lpfc_setup_disc_node(struct lpfc_vport *vport, uint32_t did)
(NLP_FCP_TARGET | NLP_NVME_TARGET)))
return NULL;
ndlp->nlp_prev_state = ndlp->nlp_state;
lpfc_nlp_set_state(vport, ndlp, NLP_STE_NPR_NODE);
lpfc_disc_state_machine(vport, ndlp, NULL,
NLP_EVT_DEVICE_RECOVERY);
spin_lock_irq(&ndlp->lock);
ndlp->nlp_flag |= NLP_NPR_2B_DISC;