]> git.baikalelectronics.ru Git - kernel.git/commit
scsi: lpfc: Allow override of hardware queue selection policies
authorJames Smart <jsmart2021@gmail.com>
Mon, 28 Jan 2019 19:14:29 +0000 (11:14 -0800)
committerMartin K. Petersen <martin.petersen@oracle.com>
Wed, 6 Feb 2019 03:29:09 +0000 (22:29 -0500)
commit816da38b9979c8971bba846e45f9e4e90765eff8
treeb205f600bf511b4ba1851bf7386085b9be0006ab
parentc956ecddb66b515743b0dcd2540cc79f9e9caf0b
scsi: lpfc: Allow override of hardware queue selection policies

Default behavior is to use the information from the upper IO stacks to
select the hardware queue to use for IO submission.  Which typically has
good cpu affinity.

However, the driver, when used on some variants of the upstream kernel, has
found queuing information to be suboptimal for FCP or IO completion locked
on particular cpus.

For command submission situations, the lpfc_fcp_io_sched module parameter
can be set to specify a hardware queue selection policy that overrides the
os stack information.

For IO completion situations, rather than queing cq processing based on the
cpu servicing the interrupting event, schedule the cq processing on the cpu
associated with the hardware queue's cq.

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>
drivers/scsi/lpfc/lpfc_attr.c
drivers/scsi/lpfc/lpfc_hw4.h
drivers/scsi/lpfc/lpfc_nvme.c
drivers/scsi/lpfc/lpfc_scsi.c
drivers/scsi/lpfc/lpfc_sli.c