scsi: lpfc: Revert RSCN_MEMENTO workaround for misbehaved configuration

The RSCN_MEMENTO logic was to workaround a target that does not register
both FCP and NVMe FC4 types at the same time.  This caused the
configuration to not produce a second RSCN for the NVMe FC4 type
registration in a timely manner.  The intention of the RSCN_MEMENTO flag
was to always signal to try NVMe PRLI.

However, there are other FCP-only target arrays in correctly behaved
configurations that reject the NVMe PRLI followed by a LOGO leading to
never rediscovering the target after an issue_lip (as LOGO causes a repeat
of PLOGI/PRLIs).

Revert the RSCN_MEMENTO patch as it is causing correctly behaved configs to
fail while it exists only to succeed on a misbehaved config.

Link: https://lore.kernel.org/r/20220701211425.2708-9-jsmart2021@gmail.com
Fixes: 1045592fc968 ("scsi: lpfc: Introduce FC_RSCN_MEMENTO flag for tracking post RSCN completion")
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>

diff --git a/drivers/scsi/lpfc/lpfc.h b/drivers/scsi/lpfc/lpfc.h
index da9070c..212f9b9 100644 (file)
--- a/drivers/scsi/lpfc/lpfc.h
+++ b/drivers/scsi/lpfc/lpfc.h
@@ -604,7 +604,6 @@ 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 31fb2ee..9371829 100644 (file)
--- a/drivers/scsi/lpfc/lpfc_els.c
+++ b/drivers/scsi/lpfc/lpfc_els.c
@@ -1887,7 +1887,6 @@ 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);
                }
        }
@@ -2435,14 +2434,13 @@ lpfc_issue_els_prli(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
        u32 local_nlp_type, elscmd;
 
        /*
-        * If discovery was kicked off from RSCN mode,
-        * the FC4 types supported from a
+        * If we are in 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 | FC_RSCN_MEMENTO) &&
+           vport->fc_flag & FC_RSCN_MODE &&
            vport->nvmei_support)
                ndlp->nlp_fc4_type |= NLP_FC4_NVME;
        local_nlp_type = ndlp->nlp_fc4_type;
@@ -7916,7 +7914,6 @@ 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;
@@ -7966,7 +7963,6 @@ 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 fb36f26..5cd838e 100644 (file)
--- a/drivers/scsi/lpfc/lpfc_hbadisc.c
+++ b/drivers/scsi/lpfc/lpfc_hbadisc.c
@@ -1354,8 +1354,7 @@ 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_MEMENTO | FC_RSCN_MODE |
-                           FC_NLP_MORE | FC_RSCN_DISCOVERY);
+                           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);