scsi: ibmvfc: Add cancel mad initialization helper

Add a helper routine for initializing a Cancel MAD. This will be useful for
a channelized client that needs to send Cancel commands down every channel
commands were sent for a particular LUN.

Link: https://lore.kernel.org/r/20210114203148.246656-18-tyreld@linux.ibm.com
Reviewed-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: Tyrel Datwyler <tyreld@linux.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/ibmvscsi/ibmvfc.c

@@ -2379,6 +2379,45 @@ static int ibmvfc_wait_for_ops(struct ibmvfc_host *vhost, void *device,
 	return SUCCESS;
 }
 
+static struct ibmvfc_event *ibmvfc_init_tmf(struct ibmvfc_queue *queue,
+					    struct scsi_device *sdev,
+					    int type)
+{
+	struct ibmvfc_host *vhost = shost_priv(sdev->host);
+	struct scsi_target *starget = scsi_target(sdev);
+	struct fc_rport *rport = starget_to_rport(starget);
+	struct ibmvfc_event *evt;
+	struct ibmvfc_tmf *tmf;
+
+	evt = ibmvfc_get_event(queue);
+	ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
+
+	tmf = &evt->iu.tmf;
+	memset(tmf, 0, sizeof(*tmf));
+	if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
+		tmf->common.version = cpu_to_be32(2);
+		tmf->target_wwpn = cpu_to_be64(rport->port_name);
+	} else {
+		tmf->common.version = cpu_to_be32(1);
+	}
+	tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
+	tmf->common.length = cpu_to_be16(sizeof(*tmf));
+	tmf->scsi_id = cpu_to_be64(rport->port_id);
+	int_to_scsilun(sdev->lun, &tmf->lun);
+	if (!ibmvfc_check_caps(vhost, IBMVFC_CAN_SUPPRESS_ABTS))
+		type &= ~IBMVFC_TMF_SUPPRESS_ABTS;
+	if (vhost->state == IBMVFC_ACTIVE)
+		tmf->flags = cpu_to_be32((type | IBMVFC_TMF_LUA_VALID));
+	else
+		tmf->flags = cpu_to_be32(((type & IBMVFC_TMF_SUPPRESS_ABTS) | IBMVFC_TMF_LUA_VALID));
+	tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
+	tmf->my_cancel_key = cpu_to_be32((unsigned long)starget->hostdata);
+
+	init_completion(&evt->comp);
+
+	return evt;
+}
+
 /**
  * ibmvfc_cancel_all - Cancel all outstanding commands to the device
  * @sdev:	scsi device to cancel commands
@@ -2393,9 +2432,6 @@ static int ibmvfc_wait_for_ops(struct ibmvfc_host *vhost, void *device,
 static int ibmvfc_cancel_all(struct scsi_device *sdev, int type)
 {
 	struct ibmvfc_host *vhost = shost_priv(sdev->host);
-	struct scsi_target *starget = scsi_target(sdev);
-	struct fc_rport *rport = starget_to_rport(starget);
-	struct ibmvfc_tmf *tmf;
 	struct ibmvfc_event *evt, *found_evt;
 	union ibmvfc_iu rsp;
 	int rsp_rc = -EBUSY;
@@ -2422,32 +2458,8 @@ static int ibmvfc_cancel_all(struct scsi_device *sdev, int type)
 	}
 
 	if (vhost->logged_in) {
-		evt = ibmvfc_get_event(&vhost->crq);
+		evt = ibmvfc_init_tmf(&vhost->crq, sdev, type);
-		ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
-
-		tmf = &evt->iu.tmf;
-		memset(tmf, 0, sizeof(*tmf));
-		if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
-			tmf->common.version = cpu_to_be32(2);
-			tmf->target_wwpn = cpu_to_be64(rport->port_name);
-		} else {
-			tmf->common.version = cpu_to_be32(1);
-		}
-		tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
-		tmf->common.length = cpu_to_be16(sizeof(*tmf));
-		tmf->scsi_id = cpu_to_be64(rport->port_id);
-		int_to_scsilun(sdev->lun, &tmf->lun);
-		if (!ibmvfc_check_caps(vhost, IBMVFC_CAN_SUPPRESS_ABTS))
-			type &= ~IBMVFC_TMF_SUPPRESS_ABTS;
-		if (vhost->state == IBMVFC_ACTIVE)
-			tmf->flags = cpu_to_be32((type | IBMVFC_TMF_LUA_VALID));
-		else
-			tmf->flags = cpu_to_be32(((type & IBMVFC_TMF_SUPPRESS_ABTS) | IBMVFC_TMF_LUA_VALID));
-		tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
-		tmf->my_cancel_key = cpu_to_be32((unsigned long)starget->hostdata);
-
 		evt->sync_iu = &rsp;
-		init_completion(&evt->comp);
 		rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
 	}