qla2xxx: Add selective command queuing

BugLink: http://bugs.launchpad.net/bugs/1541456

queue work element to specific process lessen cache miss
Signed-off-by: Quinn Tran <quinn.tran@qlogic.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@qlogic.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
(cherry picked from commit fb3269ba)
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

drivers/scsi/qla2xxx/qla_isr.c

@@ -3302,7 +3302,7 @@ static void qla_irq_affinity_notify(struct irq_affinity_notify *notify,
 	}
 }
 
-void qla_irq_affinity_release(struct kref *ref)
+static void qla_irq_affinity_release(struct kref *ref)
 {
 	struct irq_affinity_notify *notify =
 		container_of(ref, struct irq_affinity_notify, kref);

drivers/scsi/qla2xxx/qla_target.c

@@ -3982,13 +3982,24 @@ static int qlt_handle_cmd_for_atio(struct scsi_qla_host *vha,
 
 	cmd->cmd_in_wq = 1;
 	cmd->cmd_flags |= BIT_0;
+	cmd->se_cmd.cpuid = -1;
 
 	spin_lock(&vha->cmd_list_lock);
 	list_add_tail(&cmd->cmd_list, &vha->qla_cmd_list);
 	spin_unlock(&vha->cmd_list_lock);
 
 	INIT_WORK(&cmd->work, qlt_do_work);
-	queue_work(qla_tgt_wq, &cmd->work);
+	if (ha->msix_count) {
+		cmd->se_cmd.cpuid = ha->tgt.rspq_vector_cpuid;
+		if (cmd->atio.u.isp24.fcp_cmnd.rddata)
+			queue_work_on(smp_processor_id(), qla_tgt_wq,
+			    &cmd->work);
+		else
+			queue_work_on(cmd->se_cmd.cpuid, qla_tgt_wq,
+			    &cmd->work);
+	} else {
+		queue_work(qla_tgt_wq, &cmd->work);
+	}
 	return 0;
 
 }

drivers/scsi/qla2xxx/tcm_qla2xxx.c

@@ -299,7 +299,7 @@ static void tcm_qla2xxx_free_cmd(struct qla_tgt_cmd *cmd)
 	cmd->vha->tgt_counters.core_qla_free_cmd++;
 	cmd->cmd_in_wq = 1;
 	INIT_WORK(&cmd->work, tcm_qla2xxx_complete_free);
-	queue_work(tcm_qla2xxx_free_wq, &cmd->work);
+	queue_work_on(smp_processor_id(), tcm_qla2xxx_free_wq, &cmd->work);
 }
 
 /*
@@ -504,7 +504,7 @@ static void tcm_qla2xxx_handle_data(struct qla_tgt_cmd *cmd)
 	cmd->cmd_flags |= BIT_10;
 	cmd->cmd_in_wq = 1;
 	INIT_WORK(&cmd->work, tcm_qla2xxx_handle_data_work);
-	queue_work(tcm_qla2xxx_free_wq, &cmd->work);
+	queue_work_on(smp_processor_id(), tcm_qla2xxx_free_wq, &cmd->work);
 }
 
 static void tcm_qla2xxx_handle_dif_work(struct work_struct *work)

drivers/target/target_core_transport.c

@@ -715,7 +715,10 @@ void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
 	cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
 	spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 
-	queue_work(target_completion_wq, &cmd->work);
+	if (cmd->cpuid == -1)
+		queue_work(target_completion_wq, &cmd->work);
+	else
+		queue_work_on(cmd->cpuid, target_completion_wq, &cmd->work);
 }
 EXPORT_SYMBOL(target_complete_cmd);
 

include/target/target_core_base.h

@@ -526,6 +526,7 @@ struct se_cmd {
 	unsigned int		t_prot_nents;
 	sense_reason_t		pi_err;
 	sector_t		bad_sector;
+	int			cpuid;
 };
 
 struct se_ua {