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authorQuinn Tran <quinn.tran@cavium.com>2017-06-13 20:47:20 -0700
committerMartin K. Petersen <martin.petersen@oracle.com>2017-06-27 21:21:40 -0400
commit09620eeb62c4167d0c206f9a69730fa9e9251aae (patch)
tree7c03e5194e923553bebefd958d645e7c2eb8963f /drivers/scsi/qla2xxx/qla_isr.c
parentd65237c7f086042b5630d94fe2d151f62c09f723 (diff)
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>
Diffstat (limited to 'drivers/scsi/qla2xxx/qla_isr.c')
-rw-r--r--drivers/scsi/qla2xxx/qla_isr.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c
index 9eb946cc8297..3c9f9aa7f2c2 100644
--- a/drivers/scsi/qla2xxx/qla_isr.c
+++ b/drivers/scsi/qla2xxx/qla_isr.c
@@ -3227,9 +3227,14 @@ qla24xx_enable_msix(struct qla_hw_data *ha, struct rsp_que *rsp)
min_vecs++;
}
- ret = pci_alloc_irq_vectors_affinity(ha->pdev, min_vecs,
- ha->msix_count, PCI_IRQ_MSIX | PCI_IRQ_AFFINITY,
- &desc);
+ if (USER_CTRL_IRQ(ha)) {
+ /* user wants to control IRQ setting for target mode */
+ ret = pci_alloc_irq_vectors(ha->pdev, min_vecs,
+ ha->msix_count, PCI_IRQ_MSIX);
+ } else
+ ret = pci_alloc_irq_vectors_affinity(ha->pdev, min_vecs,
+ ha->msix_count, PCI_IRQ_MSIX | PCI_IRQ_AFFINITY,
+ &desc);
if (ret < 0) {
ql_log(ql_log_fatal, vha, 0x00c7,