scsi: lpfc: Introduce FC_RSCN_MEMENTO flag for tracking post RSCN completion

During an NVMe target reboot, the target may initialize itself as FCP only
during the first RSCN and shortly after trigger a second RSCN claiming NVMe
support.  The timing of these RSCNs occur before FCP-PRLI for the first
RSCN completes leading discovery issues over NVMe.

Change RSCN and NVME-PRLI send logic based on a new FC_RSCN_MEMENTO flag
that signals when lpfc_end_rscn() is completed and serves as a memento that
discovery was started from RSCN.

Link: https://lore.kernel.org/r/20220412222008.126521-20-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>

3 files changed, 9 insertions, 3 deletions

diff --git a/drivers/scsi/lpfc/lpfc.h b/drivers/scsi/lpfc/lpfc.h
index 0025760230e5..a62cf1a19280 100644
--- a/drivers/scsi/lpfc/lpfc.h
+++ b/drivers/scsi/lpfc/lpfc.h
@@ -604,6 +604,7 @@ struct lpfc_vport {
 #define FC_VFI_REGISTERED	0x800000 /* VFI is registered */
 #define FC_FDISC_COMPLETED	0x1000000/* FDISC completed */
 #define FC_DISC_DELAYED		0x2000000/* Delay NPort discovery */
+#define FC_RSCN_MEMENTO		0x4000000/* RSCN cmd processed */
 
 	uint32_t ct_flags;
 #define FC_CT_RFF_ID		0x1	 /* RFF_ID accepted by switch */
diff --git a/drivers/scsi/lpfc/lpfc_els.c b/drivers/scsi/lpfc/lpfc_els.c
index a7a47da4bb9d..e734ae972d1e 100644
--- a/drivers/scsi/lpfc/lpfc_els.c
+++ b/drivers/scsi/lpfc/lpfc_els.c
@@ -1896,6 +1896,7 @@ lpfc_end_rscn(struct lpfc_vport *vport)
 		else {
 			spin_lock_irq(shost->host_lock);
 			vport->fc_flag &= ~FC_RSCN_MODE;
+			vport->fc_flag |= FC_RSCN_MEMENTO;
 			spin_unlock_irq(shost->host_lock);
 		}
 	}
@@ -2444,13 +2445,14 @@ lpfc_issue_els_prli(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
 	u32 local_nlp_type, elscmd;
 
 	/*
-	 * If we are in RSCN mode, the FC4 types supported from a
+	 * If discovery was kicked off from RSCN mode,
+	 * the FC4 types supported from a
 	 * previous GFT_ID command may not be accurate. So, if we
 	 * are a NVME Initiator, always look for the possibility of
 	 * the remote NPort beng a NVME Target.
 	 */
 	if (phba->sli_rev == LPFC_SLI_REV4 &&
-	    vport->fc_flag & FC_RSCN_MODE &&
+	    vport->fc_flag & (FC_RSCN_MODE | FC_RSCN_MEMENTO) &&
 	    vport->nvmei_support)
 		ndlp->nlp_fc4_type |= NLP_FC4_NVME;
 	local_nlp_type = ndlp->nlp_fc4_type;
@@ -7988,6 +7990,7 @@ lpfc_els_rcv_rscn(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
 		if ((rscn_cnt < FC_MAX_HOLD_RSCN) &&
 		    !(vport->fc_flag & FC_RSCN_DISCOVERY)) {
 			vport->fc_flag |= FC_RSCN_MODE;
+			vport->fc_flag &= ~FC_RSCN_MEMENTO;
 			spin_unlock_irq(shost->host_lock);
 			if (rscn_cnt) {
 				cmd = vport->fc_rscn_id_list[rscn_cnt-1]->virt;
@@ -8037,6 +8040,7 @@ lpfc_els_rcv_rscn(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
 
 	spin_lock_irq(shost->host_lock);
 	vport->fc_flag |= FC_RSCN_MODE;
+	vport->fc_flag &= ~FC_RSCN_MEMENTO;
 	spin_unlock_irq(shost->host_lock);
 	vport->fc_rscn_id_list[vport->fc_rscn_id_cnt++] = pcmd;
 	/* Indicate we are done walking fc_rscn_id_list on this vport */
diff --git a/drivers/scsi/lpfc/lpfc_hbadisc.c b/drivers/scsi/lpfc/lpfc_hbadisc.c
index 2b877dff5ed4..d6ff864b132b 100644
--- a/drivers/scsi/lpfc/lpfc_hbadisc.c
+++ b/drivers/scsi/lpfc/lpfc_hbadisc.c
@@ -1343,7 +1343,8 @@ lpfc_linkup_port(struct lpfc_vport *vport)
 
 	spin_lock_irq(shost->host_lock);
 	vport->fc_flag &= ~(FC_PT2PT | FC_PT2PT_PLOGI | FC_ABORT_DISCOVERY |
-			    FC_RSCN_MODE | FC_NLP_MORE | FC_RSCN_DISCOVERY);
+			    FC_RSCN_MEMENTO | FC_RSCN_MODE |
+			    FC_NLP_MORE | FC_RSCN_DISCOVERY);
 	vport->fc_flag |= FC_NDISC_ACTIVE;
 	vport->fc_ns_retry = 0;
 	spin_unlock_irq(shost->host_lock);