[PATCH v4 14/21] ibmvfc: set and track hw queue in ibmvfc_event struct

[Tyrel Datwyler <tyreld@xxxxxxxxxxxxx>]

Extract the hwq id from a SCSI command and store it in the ibmvfc_event
structure to identify which Sub-CRQ to send the command down when
channels are being utilized.

Signed-off-by: Tyrel Datwyler <tyreld@xxxxxxxxxxxxx>
---
 drivers/scsi/ibmvscsi/ibmvfc.c | 5 +++++
 drivers/scsi/ibmvscsi/ibmvfc.h | 1 +
 2 files changed, 6 insertions(+)

diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
index 0653d52d4ea0..3f3cc37a263f 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.c
+++ b/drivers/scsi/ibmvscsi/ibmvfc.c
@@ -1483,6 +1483,7 @@ static void ibmvfc_init_event(struct ibmvfc_event *evt,
 		evt->_done = done;
 		evt->done = ibmvfc_locked_done;
 	}
+	evt->hwq = 0;
 }
 
 /**
@@ -1839,6 +1840,8 @@ static int ibmvfc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *cmnd)
 	struct ibmvfc_cmd *vfc_cmd;
 	struct ibmvfc_fcp_cmd_iu *iu;
 	struct ibmvfc_event *evt;
+	u32 tag_and_hwq = blk_mq_unique_tag(cmnd->request);
+	u16 hwq = blk_mq_unique_tag_to_hwq(tag_and_hwq);
 	int rc;
 
 	if (unlikely((rc = fc_remote_port_chkready(rport))) ||
@@ -1865,6 +1868,8 @@ static int ibmvfc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *cmnd)
 	}
 
 	vfc_cmd->correlation = cpu_to_be64((u64)evt);
+	if (vhost->using_channels)
+		evt->hwq = hwq % vhost->scsi_scrqs.active_queues;
 
 	if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev))))
 		return ibmvfc_send_event(evt, vhost, 0);
diff --git a/drivers/scsi/ibmvscsi/ibmvfc.h b/drivers/scsi/ibmvscsi/ibmvfc.h
index 3d76cd3c1fd9..2dbce7071409 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.h
+++ b/drivers/scsi/ibmvscsi/ibmvfc.h
@@ -753,6 +753,7 @@ struct ibmvfc_event {
 	struct completion comp;
 	struct completion *eh_comp;
 	struct timer_list timer;
+	u16 hwq;
 };
 
 /* a pool of event structs for use */
-- 
2.27.0