scsi: lpfc: correct oversubscription of nvme io requests for an adapter

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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>

...

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James Smart 2018-05-24 21:08:58 -07:00 • committed by Martin K. Petersen

parent dc19e3b4a8

commit 4d5e789a2e

3 changed files with 32 additions and 4 deletions

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7

drivers/scsi/lpfc/lpfc_attr.c

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6

drivers/scsi/lpfc/lpfc_nportdisc.c

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23

drivers/scsi/lpfc/lpfc_nvme.c

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