scsi: qla2xxx: Add debug knob for user control workload
authorQuinn Tran <quinn.tran@cavium.com>
Wed, 14 Jun 2017 03:47:20 +0000 (20:47 -0700)
committerMartin K. Petersen <martin.petersen@oracle.com>
Wed, 28 Jun 2017 01:21:40 +0000 (21:21 -0400)
commit09620eeb62c4167d0c206f9a69730fa9e9251aae
tree7c03e5194e923553bebefd958d645e7c2eb8963f
parentd65237c7f086042b5630d94fe2d151f62c09f723
scsi: qla2xxx: Add debug knob for user control workload

For Target mode, user can control the work load by placing qla2xxx's irq
vector on certain CPU via the smp_affinity knob. This patch allows user
to control the number of QPair's irq to be active. The irqs are
allocated at driver load time until unload. The work itself is placed on
the QPair based on user setting.

Usage:
  modprobe qla2xxx qlini_mode=disabled ql2xuctrlirq=1
  mount -t debugfs none /sys/kernel/debug
  echo 2 > /sys/kernel/debug/qla2xxx/qla2xxx_[host num]/naqp
  echo [cpu id] > /proc/irq/[irq id]/smp_affinity_list

Signed-off-by: Quinn Tran <quinn.tran@cavium.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
drivers/scsi/qla2xxx/qla_def.h
drivers/scsi/qla2xxx/qla_dfs.c
drivers/scsi/qla2xxx/qla_gbl.h
drivers/scsi/qla2xxx/qla_isr.c
drivers/scsi/qla2xxx/qla_target.c