[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_mbx.c b/drivers/scsi/qla2xxx/qla_mbx.c
index bfdc89f..366522e 100644
--- a/drivers/scsi/qla2xxx/qla_mbx.c
+++ b/drivers/scsi/qla2xxx/qla_mbx.c
@@ -1497,7 +1497,10 @@
DEBUG11(printk("%s(%ld): entered.\n", __func__, vha->host_no));
- req = vha->req;
+ if (ql2xmultique_tag)
+ req = ha->req_q_map[0];
+ else
+ req = vha->req;
rsp = req->rsp;
lg = dma_pool_alloc(ha->s_dma_pool, GFP_KERNEL, &lg_dma);
@@ -2311,7 +2314,10 @@
vha = fcport->vha;
ha = vha->hw;
req = vha->req;
- rsp = req->rsp;
+ if (ql2xmultique_tag)
+ rsp = ha->rsp_q_map[tag + 1];
+ else
+ rsp = req->rsp;
tsk = dma_pool_alloc(ha->s_dma_pool, GFP_KERNEL, &tsk_dma);
if (tsk == NULL) {
DEBUG2_3(printk("%s(%ld): failed to allocate Task Management "