[PATCH v3 11/18] ibmvfc: set and track hw queue in ibmvfc_event struct

[Tyrel Datwyler]

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 <tyr...@linux.ibm.com>
Reviewed-by: Brian King <brk...@linux.vnet.ibm.com>
---
 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 0eb91ac86d96..b51ae17883b7 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.c
+++ b/drivers/scsi/ibmvscsi/ibmvfc.c
@@ -1397,6 +1397,7 @@ static void ibmvfc_init_event(struct ibmvfc_event *evt,
        evt->crq.format = format;
        evt->done = done;
        evt->eh_comp = NULL;
+       evt->hwq = 0;
 }
 
 /**
@@ -1748,6 +1749,8 @@ static int ibmvfc_queuecommand_lck(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))) ||
@@ -1775,6 +1778,8 @@ static int ibmvfc_queuecommand_lck(struct scsi_cmnd *cmnd,
        }
 
        vfc_cmd->correlation = cpu_to_be64(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 dff26dbd912c..e0ffb0416223 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.h
+++ b/drivers/scsi/ibmvscsi/ibmvfc.h
@@ -781,6 +781,7 @@ 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