[PATCH AUTOSEL 6.11 201/244] scsi: lpfc: Update PRLO handling in direct attached topology

Sasha Levin
2024-09-25T11:50:32Z

From: Justin Tee <justin.tee@broadcom.com>

[ Upstream commit 1f0f7679ad8942f810b0f19ee9cf098c3502d66a ]

A kref imbalance occurs when handling an unsolicited PRLO in direct
attached topology.

Rework PRLO rcv handling when in MAPPED state. Save the state that we were
handling a PRLO by setting nlp_last_elscmd to ELS_CMD_PRLO. Then in the
lpfc_cmpl_els_logo_acc() completion routine, manually restart discovery.
By issuing the PLOGI, which nlp_gets, before nlp_put at the end of the
lpfc_cmpl_els_logo_acc() routine, we are saving us from a final nlp_put.
And, we are still allowing the unreg_rpi to happen.

Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Link: https://lore.kernel.org/r/20240726231512.92867-7-justintee8345@gmail.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/scsi/lpfc/lpfc_els.c | 27 ++++++++++++++++-----------
drivers/scsi/lpfc/lpfc_nportdisc.c | 22 ++++++++++++++++++++--
2 files changed, 36 insertions(+), 13 deletions(-)

diff --git a/drivers/scsi/lpfc/lpfc_els.c b/drivers/scsi/lpfc/lpfc_els.c
index 8c0926ffee1bf..e27f5d955edb4 100644
--- a/drivers/scsi/lpfc/lpfc_els.c
+++ b/drivers/scsi/lpfc/lpfc_els.c
@@ -5244,9 +5244,10 @@ lpfc_cmpl_els_logo_acc(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
/* ACC to LOGO completes to NPort <nlp_DID> */
lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
"0109 ACC to LOGO completes to NPort x%x refcnt %d "
- "Data: x%x x%x x%x\n",
- ndlp->nlp_DID, kref_read(&ndlp->kref), ndlp->nlp_flag,
- ndlp->nlp_state, ndlp->nlp_rpi);
+ "last els x%x Data: x%x x%x x%x\n",
+ ndlp->nlp_DID, kref_read(&ndlp->kref),
+ ndlp->nlp_last_elscmd, ndlp->nlp_flag, ndlp->nlp_state,
+ ndlp->nlp_rpi);

/* This clause allows the LOGO ACC to complete and free resources
* for the Fabric Domain Controller. It does deliberately skip
@@ -5258,18 +5259,22 @@ lpfc_cmpl_els_logo_acc(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
goto out;

if (ndlp->nlp_state == NLP_STE_NPR_NODE) {
- /* If PLOGI is being retried, PLOGI completion will cleanup the
- * node. The NLP_NPR_2B_DISC flag needs to be retained to make
- * progress on nodes discovered from last RSCN.
- */
- if ((ndlp->nlp_flag & NLP_DELAY_TMO) &&
- (ndlp->nlp_last_elscmd == ELS_CMD_PLOGI))
- goto out;
-
if (ndlp->nlp_flag & NLP_RPI_REGISTERED)
lpfc_unreg_rpi(vport, ndlp);

+ /* If came from PRLO, then PRLO_ACC is done.
+ * Start rediscovery now.
+ */
+ if (ndlp->nlp_last_elscmd == ELS_CMD_PRLO) {
+ spin_lock_irq(&ndlp->lock);
+ ndlp->nlp_flag |= NLP_NPR_2B_DISC;
+ spin_unlock_irq(&ndlp->lock);
+ ndlp->nlp_prev_state = ndlp->nlp_state;
+ lpfc_nlp_set_state(vport, ndlp, NLP_STE_PLOGI_ISSUE);
+ lpfc_issue_els_plogi(vport, ndlp->nlp_DID, 0);
+ }
}
+
out:
/*
* The driver received a LOGO from the rport and has ACK'd it.
diff --git a/drivers/scsi/lpfc/lpfc_nportdisc.c b/drivers/scsi/lpfc/lpfc_nportdisc.c
index f6a53446e57f9..4574716c8764f 100644
--- a/drivers/scsi/lpfc/lpfc_nportdisc.c
+++ b/drivers/scsi/lpfc/lpfc_nportdisc.c
@@ -2652,8 +2652,26 @@ lpfc_rcv_prlo_mapped_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
/* flush the target */
lpfc_sli_abort_iocb(vport, ndlp->nlp_sid, 0, LPFC_CTX_TGT);

- /* Treat like rcv logo */
- lpfc_rcv_logo(vport, ndlp, cmdiocb, ELS_CMD_PRLO);
+ /* Send PRLO_ACC */
+ spin_lock_irq(&ndlp->lock);
+ ndlp->nlp_flag |= NLP_LOGO_ACC;
+ spin_unlock_irq(&ndlp->lock);
+ lpfc_els_rsp_acc(vport, ELS_CMD_PRLO, cmdiocb, ndlp, NULL);
+
+ /* Save ELS_CMD_PRLO as the last elscmd and then set to NPR.
+ * lpfc_cmpl_els_logo_acc is expected to restart discovery.
+ */
+ ndlp->nlp_last_elscmd = ELS_CMD_PRLO;
+ ndlp->nlp_prev_state = ndlp->nlp_state;
+
+ lpfc_printf_vlog(vport, KERN_INFO, LOG_NODE | LOG_ELS | LOG_DISCOVERY,
+ "3422 DID x%06x nflag x%x lastels x%x ref cnt %u\n",
+ ndlp->nlp_DID, ndlp->nlp_flag,
+ ndlp->nlp_last_elscmd,
+ kref_read(&ndlp->kref));
+
+ lpfc_nlp_set_state(vport, ndlp, NLP_STE_NPR_NODE);
+
return ndlp->nlp_state;
}

--
2.43.0