[SCSI] qla2xxx: Add CPU affinity support.
Set the module parameter ql2xmultique_tag to 1 to enable this
feature. In this mode, the total number of response queues
created is equal to the number of online cpus. Turning the block
layer's rq_affinity mode on enables requests to be routed to the
proper cpu and at the same time it enables completion of the IO
in a response queue that is affined to the cpu in the request
path.
Signed-off-by: Anirban Chakraborty <anirban.chakraborty@qlogic.com>
Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c
index c8e906c..41e50c2 100644
--- a/drivers/scsi/qla2xxx/qla_isr.c
+++ b/drivers/scsi/qla2xxx/qla_isr.c
@@ -1718,6 +1718,25 @@
}
static irqreturn_t
+qla25xx_msix_rsp_q(int irq, void *dev_id)
+{
+ struct qla_hw_data *ha;
+ struct rsp_que *rsp;
+
+ rsp = (struct rsp_que *) dev_id;
+ if (!rsp) {
+ printk(KERN_INFO
+ "%s(): NULL response queue pointer\n", __func__);
+ return IRQ_NONE;
+ }
+ ha = rsp->hw;
+
+ queue_work_on((int) (rsp->id - 1), ha->wq, &rsp->q_work);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t
qla24xx_msix_default(int irq, void *dev_id)
{
scsi_qla_host_t *vha;
@@ -1806,9 +1825,10 @@
irq_handler_t handler;
};
-static struct qla_init_msix_entry msix_entries[2] = {
+static struct qla_init_msix_entry msix_entries[3] = {
{ "qla2xxx (default)", qla24xx_msix_default },
{ "qla2xxx (rsp_q)", qla24xx_msix_rsp_q },
+ { "qla2xxx (multiq)", qla25xx_msix_rsp_q },
};
static void