scsi: ibmvfc: Use correlation token to tag commands

The vfcFrame correlation field is a 64bit handle that is intended to trace
I/O operations through both the client stack and VIOS stack when the
underlying physical FC adapter supports tagging.

Tag vfcFrames with the associated ibmvfc_event pointer handle.

Link: https://lore.kernel.org/r/20201117185031.129939-3-tyreld@linux.ibm.com
Signed-off-by: Tyrel Datwyler <tyreld@linux.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
index 0cab4b8..3922441 100644 (file)
--- a/drivers/scsi/ibmvscsi/ibmvfc.c
+++ b/drivers/scsi/ibmvscsi/ibmvfc.c
@@ -1693,6 +1693,8 @@ static int ibmvfc_queuecommand_lck(struct scsi_cmnd *cmnd,
                vfc_cmd->iu.pri_task_attr = IBMVFC_SIMPLE_TASK;
        }
 
+       vfc_cmd->correlation = cpu_to_be64(evt);
+
        if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev))))
                return ibmvfc_send_event(evt, vhost, 0);
 
@@ -2370,6 +2372,8 @@ static int ibmvfc_abort_task_set(struct scsi_device *sdev)
                tmf->iu.tmf_flags = IBMVFC_ABORT_TASK_SET;
                evt->sync_iu = &rsp_iu;
 
+               tmf->correlation = cpu_to_be64(evt);
+
                init_completion(&evt->comp);
                rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
        }