[PATCH 5.19 0785/1157] scsi: lpfc: Revert RSCN_MEMENTO workaround for misbehaved configuration

Greg Kroah-Hartman
2022-08-16T04:43:03Z

From: James Smart <jsmart2021@gmail.com>

[ Upstream commit ffc566411aded3c12c63e1310fb23830e9608c59 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/scsi/lpfc/lpfc.h | 1 -
drivers/scsi/lpfc/lpfc_els.c | 8 ++------
drivers/scsi/lpfc/lpfc_hbadisc.c | 3 +--
3 files changed, 3 insertions(+), 9 deletions(-)

diff --git a/drivers/scsi/lpfc/lpfc.h b/drivers/scsi/lpfc/lpfc.h
index da9070cdad91..212f9b962187 100644
--- 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 3fababb7c181..c904e9486b92 100644
--- a/drivers/scsi/lpfc/lpfc_els.c
+++ b/drivers/scsi/lpfc/lpfc_els.c
@@ -1886,7 +1886,6 @@ 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);
}
}
@@ -2434,14 +2433,13 @@ 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;
@@ -7915,7 +7913,6 @@ 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;
@@ -7965,7 +7962,6 @@ 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 fb36f26170e4..5cd838eac455 100644
--- 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);
--
2.35.1