[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>

1 files changed, 8 insertions, 2 deletions

diff --git a/drivers/scsi/qla2xxx/qla_mbx.c b/drivers/scsi/qla2xxx/qla_mbx.c
index bfdc89f8569b..366522e8a766 100644
--- a/drivers/scsi/qla2xxx/qla_mbx.c
+++ b/drivers/scsi/qla2xxx/qla_mbx.c
@@ -1497,7 +1497,10 @@ qla24xx_login_fabric(scsi_qla_host_t *vha, uint16_t loop_id, uint8_t domain,
 
         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 @@ __qla24xx_issue_tmf(char *name, uint32_t type, struct fc_port *fcport,
         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 "