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scsi: lpfc: Fix RSCN timeout due to incorrect gidft counter 

In configs with a large number of initiators in the same zone (>250), RSCN
timeouts are seen when creating or deleting vports:

   lpfc 0000:07:00.1: 5:(0):0231 RSCN timeout Data: x0 x3

During RSCN processing driver issues GID_FT command to nameserver. A
counter for number of simultaneous GID_FT commands is maintained (an
unsigned value). The counter is incremented when the GID_FT is issued.  If
the GID_FT command fails for some reason the driver retries the GID_FT from
the completion call back. But the counter was decremented before the retry
was issued.  When the second GID_FT completes, the callback again tries to
decrement the counter, possibly wrapping to a very large non-zero value,
which causes the RSCN cleanup code to not execute. Thus the RSCN timeout
failure.

Do not decrement the counter on a retry. Also add defensive checks to
ensure the counter is not decremented if already zero.

Link: https://lore.kernel.org/r/20200803210229.23063-4-jsmart2021@gmail.com
Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Dick Kennedy 2020-08-03 14:02:24 -07:00 committed by Martin K. Petersen
parent 9e3e365a92
commit 8ccd6926db
1 changed files with 16 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
drivers/scsi/lpfc/lpfc_ct.c
View File

@ -713,7 +713,8 @@ lpfc_cmpl_ct_cmd_gid_ft(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
/* This is a GID_FT completing so the gidft_inp counter was
* incremented before the GID_FT was issued to the wire.
*/
vport->gidft_inp--;
if (vport->gidft_inp)
vport->gidft_inp--;
/*
* Skip processing the NS response
@ -741,11 +742,14 @@ lpfc_cmpl_ct_cmd_gid_ft(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
goto out;
/* CT command is being retried */
vport->gidft_inp--;
rc = lpfc_ns_cmd(vport, SLI_CTNS_GID_FT,
vport->fc_ns_retry, type);
if (rc == 0)
goto out;
else { /* Unable to send NS cmd */
if (vport->gidft_inp)
vport->gidft_inp--;
}
}
if (vport->fc_flag & FC_RSCN_MODE)
lpfc_els_flush_rscn(vport);
@ -825,7 +829,8 @@ lpfc_cmpl_ct_cmd_gid_ft(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
(uint32_t) CTrsp->ReasonCode,
(uint32_t) CTrsp->Explanation);
}
vport->gidft_inp--;
if (vport->gidft_inp)
vport->gidft_inp--;
}
lpfc_printf_vlog(vport, KERN_INFO, LOG_DISCOVERY,
@ -918,7 +923,8 @@ lpfc_cmpl_ct_cmd_gid_pt(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
/* This is a GID_PT completing so the gidft_inp counter was
* incremented before the GID_PT was issued to the wire.
*/
vport->gidft_inp--;
if (vport->gidft_inp)
vport->gidft_inp--;
/*
* Skip processing the NS response
@ -942,11 +948,14 @@ lpfc_cmpl_ct_cmd_gid_pt(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
vport->fc_ns_retry++;
/* CT command is being retried */
vport->gidft_inp--;
rc = lpfc_ns_cmd(vport, SLI_CTNS_GID_PT,
vport->fc_ns_retry, GID_PT_N_PORT);
if (rc == 0)
goto out;
else { /* Unable to send NS cmd */
if (vport->gidft_inp)
vport->gidft_inp--;
}
}
if (vport->fc_flag & FC_RSCN_MODE)
lpfc_els_flush_rscn(vport);
@ -1027,7 +1036,8 @@ lpfc_cmpl_ct_cmd_gid_pt(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
(uint32_t)CTrsp->ReasonCode,
(uint32_t)CTrsp->Explanation);
}
vport->gidft_inp--;
if (vport->gidft_inp)
vport->gidft_inp--;
}
lpfc_printf_vlog(vport, KERN_INFO, LOG_DISCOVERY,