tree 2cd682f0d56a385908cca3285dd3021e1189344e
parent dc19e3b4a80e0bb1e5f080473fffa0ac8c0694a6
author James Smart <jsmart2021@gmail.com> 1527221338 -0700
committer Martin K. Petersen <martin.petersen@oracle.com> 1527561633 -0400

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>