[PATCH AUTOSEL 4.19 213/237] scsi: lpfc: Fix odd recovery in duplicate FLOGIs in point-to-point

Sasha Levin
2019-11-16T16:17:28Z

From: James Smart <jsmart2021@gmail.com>

[ Upstream commit d496b9a7246cb9813da1fe49e14edbbbf8e232d5 ]

Testing a point-to-point topology and a case of re-FLOGI without
intervening link bouncing, showed an odd interaction with firmware and
a resulting scenario where the driver no longer probed after accepting
the new FLOGI.

Work around the firmware issue by issuing a link bounce if a FLOGI is
received after the link is already up and FLOGI's accepted.

While debugging the issue, realized that some debug traces should be
clarified to help in the future.

Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Reviewed-by: Hannes Reinecke <hare@suse.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 | 66 ++++++++++++++++++++++++++------
drivers/scsi/lpfc/lpfc_hbadisc.c | 9 +++++
3 files changed, 64 insertions(+), 12 deletions(-)

diff --git a/drivers/scsi/lpfc/lpfc.h b/drivers/scsi/lpfc/lpfc.h
index 43732e8d13473..ebcfcbb8b4ccc 100644
--- a/drivers/scsi/lpfc/lpfc.h
+++ b/drivers/scsi/lpfc/lpfc.h
@@ -490,6 +490,7 @@ struct lpfc_vport {
struct nvme_fc_local_port *localport;
uint8_t nvmei_support; /* driver supports NVME Initiator */
uint32_t last_fcp_wqidx;
+ uint32_t rcv_flogi_cnt; /* How many unsol FLOGIs ACK'd. */
};

struct hbq_s {
diff --git a/drivers/scsi/lpfc/lpfc_els.c b/drivers/scsi/lpfc/lpfc_els.c
index 8bf916b9a987d..e263a486b1c6c 100644
--- a/drivers/scsi/lpfc/lpfc_els.c
+++ b/drivers/scsi/lpfc/lpfc_els.c
@@ -1057,9 +1057,9 @@ lpfc_cmpl_els_flogi(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
goto flogifail;

lpfc_printf_vlog(vport, KERN_WARNING, LOG_ELS,
- "0150 FLOGI failure Status:x%x/x%x TMO:x%x\n",
+ "0150 FLOGI failure Status:x%x/x%x xri x%x TMO:x%x\n",
irsp->ulpStatus, irsp->un.ulpWord[4],
- irsp->ulpTimeout);
+ cmdiocb->sli4_xritag, irsp->ulpTimeout);

/* FLOGI failed, so there is no fabric */
spin_lock_irq(shost->host_lock);
@@ -1113,7 +1113,8 @@ lpfc_cmpl_els_flogi(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
/* FLOGI completes successfully */
lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
"0101 FLOGI completes successfully, I/O tag:x%x, "
- "Data: x%x x%x x%x x%x x%x x%x\n", cmdiocb->iotag,
+ "xri x%x Data: x%x x%x x%x x%x x%x %x\n",
+ cmdiocb->iotag, cmdiocb->sli4_xritag,
irsp->un.ulpWord[4], sp->cmn.e_d_tov,
sp->cmn.w2.r_a_tov, sp->cmn.edtovResolution,
vport->port_state, vport->fc_flag);
@@ -4266,14 +4267,6 @@ lpfc_els_rsp_acc(struct lpfc_vport *vport, uint32_t flag,
default:
return 1;
}
- /* Xmit ELS ACC response tag <ulpIoTag> */
- lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
- "0128 Xmit ELS ACC response tag x%x, XRI: x%x, "
- "DID: x%x, nlp_flag: x%x nlp_state: x%x RPI: x%x "
- "fc_flag x%x\n",
- elsiocb->iotag, elsiocb->iocb.ulpContext,
- ndlp->nlp_DID, ndlp->nlp_flag, ndlp->nlp_state,
- ndlp->nlp_rpi, vport->fc_flag);
if (ndlp->nlp_flag & NLP_LOGO_ACC) {
spin_lock_irq(shost->host_lock);
if (!(ndlp->nlp_flag & NLP_RPI_REGISTERED ||
@@ -4442,6 +4435,15 @@ lpfc_els_rsp_adisc_acc(struct lpfc_vport *vport, struct lpfc_iocbq *oldiocb,
lpfc_els_free_iocb(phba, elsiocb);
return 1;
}
+
+ /* Xmit ELS ACC response tag <ulpIoTag> */
+ lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
+ "0128 Xmit ELS ACC response Status: x%x, IoTag: x%x, "
+ "XRI: x%x, DID: x%x, nlp_flag: x%x nlp_state: x%x "
+ "RPI: x%x, fc_flag x%x\n",
+ rc, elsiocb->iotag, elsiocb->sli4_xritag,
+ ndlp->nlp_DID, ndlp->nlp_flag, ndlp->nlp_state,
+ ndlp->nlp_rpi, vport->fc_flag);
return 0;
}

@@ -6452,6 +6454,11 @@ lpfc_els_rcv_flogi(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb,
port_state = vport->port_state;
vport->fc_flag |= FC_PT2PT;
vport->fc_flag &= ~(FC_FABRIC | FC_PUBLIC_LOOP);
+
+ /* Acking an unsol FLOGI. Count 1 for link bounce
+ * work-around.
+ */
+ vport->rcv_flogi_cnt++;
spin_unlock_irq(shost->host_lock);
lpfc_printf_vlog(vport, KERN_INFO, LOG_ELS,
"3311 Rcv Flogi PS x%x new PS x%x "
@@ -7849,8 +7856,9 @@ lpfc_els_unsol_buffer(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
struct ls_rjt stat;
uint32_t *payload;
uint32_t cmd, did, newnode;
- uint8_t rjt_exp, rjt_err = 0;
+ uint8_t rjt_exp, rjt_err = 0, init_link = 0;
IOCB_t *icmd = &elsiocb->iocb;
+ LPFC_MBOXQ_t *mbox;

if (!vport || !(elsiocb->context2))
goto dropit;
@@ -7999,6 +8007,19 @@ lpfc_els_unsol_buffer(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
did, vport->port_state, ndlp->nlp_flag);

phba->fc_stat.elsRcvFLOGI++;
+
+ /* If the driver believes fabric discovery is done and is ready,
+ * bounce the link. There is some descrepancy.
+ */
+ if (vport->port_state >= LPFC_LOCAL_CFG_LINK &&
+ vport->fc_flag & FC_PT2PT &&
+ vport->rcv_flogi_cnt >= 1) {
+ rjt_err = LSRJT_LOGICAL_BSY;
+ rjt_exp = LSEXP_NOTHING_MORE;
+ init_link++;
+ goto lsrjt;
+ }
+
lpfc_els_rcv_flogi(vport, elsiocb, ndlp);
if (newnode)
lpfc_nlp_put(ndlp);
@@ -8227,6 +8248,27 @@ lpfc_els_unsol_buffer(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,

lpfc_nlp_put(elsiocb->context1);
elsiocb->context1 = NULL;
+
+ /* Special case. Driver received an unsolicited command that
+ * unsupportable given the driver's current state. Reset the
+ * link and start over.
+ */
+ if (init_link) {
+ mbox = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
+ if (!mbox)
+ return;
+ lpfc_linkdown(phba);
+ lpfc_init_link(phba, mbox,
+ phba->cfg_topology,
+ phba->cfg_link_speed);
+ mbox->u.mb.un.varInitLnk.lipsr_AL_PA = 0;
+ mbox->mbox_cmpl = lpfc_sli_def_mbox_cmpl;
+ mbox->vport = vport;
+ if (lpfc_sli_issue_mbox(phba, mbox, MBX_NOWAIT) ==
+ MBX_NOT_FINISHED)
+ mempool_free(mbox, phba->mbox_mem_pool);
+ }
+
return;

dropit:
diff --git a/drivers/scsi/lpfc/lpfc_hbadisc.c b/drivers/scsi/lpfc/lpfc_hbadisc.c
index 38a9245fddba1..5ec60c221d846 100644
--- a/drivers/scsi/lpfc/lpfc_hbadisc.c
+++ b/drivers/scsi/lpfc/lpfc_hbadisc.c
@@ -952,6 +952,7 @@ lpfc_linkdown(struct lpfc_hba *phba)
}
spin_lock_irq(shost->host_lock);
phba->pport->fc_flag &= ~(FC_PT2PT | FC_PT2PT_PLOGI);
+ phba->pport->rcv_flogi_cnt = 0;
spin_unlock_irq(shost->host_lock);
}
return 0;
@@ -1023,6 +1024,7 @@ lpfc_linkup(struct lpfc_hba *phba)
{
struct lpfc_vport **vports;
int i;
+ struct Scsi_Host *shost = lpfc_shost_from_vport(phba->pport);

phba->link_state = LPFC_LINK_UP;

@@ -1036,6 +1038,13 @@ lpfc_linkup(struct lpfc_hba *phba)
lpfc_linkup_port(vports[i]);
lpfc_destroy_vport_work_array(phba, vports);

+ /* Clear the pport flogi counter in case the link down was
+ * absorbed without an ACQE. No lock here - in worker thread
+ * and discovery is synchronized.
+ */
+ spin_lock_irq(shost->host_lock);
+ phba->pport->rcv_flogi_cnt = 0;
+ spin_unlock_irq(shost->host_lock);
return 0;
}

--
2.20.1