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| author | James Smart <jsmart2021@gmail.com> | 2018-05-24 21:08:58 -0700 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2018-05-28 22:40:33 -0400 |
| commit | 4d5e789a2eb111d7f9e032d0ebaecb465a2eca8f (patch) | |
| tree | 2cd682f0d56a385908cca3285dd3021e1189344e /drivers/scsi/lpfc/lpfc_nportdisc.c | |
| parent | dc19e3b4a80e0bb1e5f080473fffa0ac8c0694a6 (diff) | |
| download | blackbird-obmc-linux-4d5e789a2eb111d7f9e032d0ebaecb465a2eca8f.tar.gz blackbird-obmc-linux-4d5e789a2eb111d7f9e032d0ebaecb465a2eca8f.zip | |
scsi: lpfc: correct oversubscription of nvme io requests for an adapter
Under large configurations, the driver would start to log message 6065 -
NVME out of buffers (exchanges).
The driver is using the ndlp cmd_qdepth value when determining the max
outstanding ios for an adapter. This value, by default, is set to 65536,
which exceeds the maximum exchange counts supported on an adapter. The ndlp
cmd_qdepth has no relevance and outstanding io count should be capped at
the max exchange count with IO requests beyond that level getting bounced
back with an EBUSY status so that they are retried by the block layer.
Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <james.smart@broadcom.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/lpfc/lpfc_nportdisc.c')
| -rw-r--r-- | drivers/scsi/lpfc/lpfc_nportdisc.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/scsi/lpfc/lpfc_nportdisc.c b/drivers/scsi/lpfc/lpfc_nportdisc.c index e790c0bc64fc..1a803975bcbc 100644 --- a/drivers/scsi/lpfc/lpfc_nportdisc.c +++ b/drivers/scsi/lpfc/lpfc_nportdisc.c @@ -1982,6 +1982,12 @@ lpfc_cmpl_prli_prli_issue(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp, if (bf_get_be32(prli_disc, nvpr)) ndlp->nlp_type |= NLP_NVME_DISCOVERY; + /* This node is an NVME target. Adjust the command + * queue depth on this node to not exceed the available + * xris. + */ + ndlp->cmd_qdepth = phba->sli4_hba.nvme_xri_max; + /* * If prli_fba is set, the Target supports FirstBurst. * If prli_fb_sz is 0, the FirstBurst size is unlimited, |
