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scsi: lpfc: Reset link or adapter instead of doing infinite nameserver PLOGI retry 

Currently, PLOGI failures are infinitely delayed/retried.  There have
been some fabric situations where the PLOGI's were to the nameserver
and it stopped responding. The retries would never clear up.  A better
resolution in this situation is to retry a couple of times, then drop
the link and reinit. This brings back connectivity to the nameserver.

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>
This commit is contained in:
James Smart 2018-10-23 13:41:04 -07:00 committed by Martin K. Petersen
parent 30e196cace
commit 5cca2ab1b3
2 changed files with 83 additions and 1 deletions
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1
drivers/scsi/lpfc/lpfc_crtn.h
View File

@ -380,6 +380,7 @@ void lpfc_nvmet_buf_free(struct lpfc_hba *phba, void *virtp, dma_addr_t dma);
void lpfc_in_buf_free(struct lpfc_hba *, struct lpfc_dmabuf *);
void lpfc_rq_buf_free(struct lpfc_hba *phba, struct lpfc_dmabuf *mp);
int lpfc_link_reset(struct lpfc_vport *vport);
/* Function prototypes. */
const char* lpfc_info(struct Scsi_Host *);

83
drivers/scsi/lpfc/lpfc_els.c
View File

@ -3241,6 +3241,62 @@ lpfc_els_retry_delay_handler(struct lpfc_nodelist *ndlp)
return;
}
/**
* lpfc_link_reset - Issue link reset
* @vport: pointer to a virtual N_Port data structure.
*
* This routine performs link reset by sending INIT_LINK mailbox command.
* For SLI-3 adapter, link attention interrupt is enabled before issuing
* INIT_LINK mailbox command.
*
* Return code
* 0 - Link reset initiated successfully
* 1 - Failed to initiate link reset
**/
int
lpfc_link_reset(struct lpfc_vport *vport)
{
struct lpfc_hba *phba = vport->phba;
LPFC_MBOXQ_t *mbox;
uint32_t control;
int rc;
lpfc_printf_vlog(vport, KERN_ERR, LOG_ELS,
"2851 Attempt link reset\n");
mbox = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
if (!mbox) {
lpfc_printf_log(phba, KERN_ERR, LOG_MBOX,
"2852 Failed to allocate mbox memory");
return 1;
}
/* Enable Link attention interrupts */
if (phba->sli_rev <= LPFC_SLI_REV3) {
spin_lock_irq(&phba->hbalock);
phba->sli.sli_flag |= LPFC_PROCESS_LA;
control = readl(phba->HCregaddr);
control |= HC_LAINT_ENA;
writel(control, phba->HCregaddr);
readl(phba->HCregaddr); /* flush */
spin_unlock_irq(&phba->hbalock);
}
lpfc_init_link(phba, mbox, phba->cfg_topology,
phba->cfg_link_speed);
mbox->mbox_cmpl = lpfc_sli_def_mbox_cmpl;
mbox->vport = vport;
rc = lpfc_sli_issue_mbox(phba, mbox, MBX_NOWAIT);
if ((rc != MBX_BUSY) && (rc != MBX_SUCCESS)) {
lpfc_printf_log(phba, KERN_ERR, LOG_MBOX,
"2853 Failed to issue INIT_LINK "
"mbox command, rc:x%x\n", rc);
mempool_free(mbox, phba->mbox_mem_pool);
return 1;
}
return 0;
}
/**
* lpfc_els_retry - Make retry decision on an els command iocb
* @phba: pointer to lpfc hba data structure.
@ -3277,6 +3333,7 @@ lpfc_els_retry(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
int logerr = 0;
uint32_t cmd = 0;
uint32_t did;
int link_reset = 0, rc;
/* Note: context2 may be 0 for internal driver abort
@ -3358,7 +3415,6 @@ lpfc_els_retry(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
retry = 1;
break;
case IOERR_SEQUENCE_TIMEOUT:
case IOERR_INVALID_RPI:
if (cmd == ELS_CMD_PLOGI &&
did == NameServer_DID) {
@ -3369,6 +3425,18 @@ lpfc_els_retry(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
}
retry = 1;
break;
case IOERR_SEQUENCE_TIMEOUT:
if (cmd == ELS_CMD_PLOGI &&
did == NameServer_DID &&
(cmdiocb->retry + 1) == maxretry) {
/* Reset the Link */
link_reset = 1;
break;
}
retry = 1;
delay = 100;
break;
}
break;
@ -3525,6 +3593,19 @@ lpfc_els_retry(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
break;
}
if (link_reset) {
rc = lpfc_link_reset(vport);
if (rc) {
/* Do not give up. Retry PLOGI one more time and attempt
* link reset if PLOGI fails again.
*/
retry = 1;
delay = 100;
goto out_retry;
}
return 1;
}
if (did == FDMI_DID)
retry = 1;