[SCSI] ibmvfc: Suppress ABTS if target gone

Adds support for a new VIOS feature that allows ibmvfc to
optimize terminate_rport_io by telling the VIOS the target
is no longer accessible on the fabric and that it should
not send an ABTS out on the fabric to the device.
Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Acked-by: Robert Jennings <rcj@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

drivers/scsi/ibmvscsi/ibmvfc.c

@@ -2190,10 +2190,12 @@ static int ibmvfc_cancel_all(struct scsi_device *sdev, int type)
 		tmf->common.length = sizeof(*tmf);
 		tmf->scsi_id = rport->port_id;
 		int_to_scsilun(sdev->lun, &tmf->lun);
+		if (!(vhost->login_buf->resp.capabilities & IBMVFC_CAN_SUPPRESS_ABTS))
+			type &= ~IBMVFC_TMF_SUPPRESS_ABTS;
 		if (vhost->state == IBMVFC_ACTIVE)
 			tmf->flags = (type | IBMVFC_TMF_LUA_VALID);
 		else
-			tmf->flags = IBMVFC_TMF_LUA_VALID;
+			tmf->flags = ((type & IBMVFC_TMF_SUPPRESS_ABTS) | IBMVFC_TMF_LUA_VALID);
 		tmf->cancel_key = (unsigned long)sdev->hostdata;
 		tmf->my_cancel_key = (unsigned long)starget->hostdata;
 
@@ -2402,7 +2404,7 @@ static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd)
 		cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
 		ibmvfc_abort_task_set(sdev);
 	} else
-		cancel_rc = ibmvfc_cancel_all(sdev, 0);
+		cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
 
 	if (!cancel_rc)
 		rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
@@ -2435,7 +2437,7 @@ static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd)
 		cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_LUN_RESET);
 		reset_rc = ibmvfc_reset_device(sdev, IBMVFC_LUN_RESET, "LUN");
 	} else
-		cancel_rc = ibmvfc_cancel_all(sdev, 0);
+		cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
 
 	if (!cancel_rc && !reset_rc)
 		rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
@@ -2456,7 +2458,7 @@ static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd)
 static void ibmvfc_dev_cancel_all_noreset(struct scsi_device *sdev, void *data)
 {
 	unsigned long *rc = data;
-	*rc |= ibmvfc_cancel_all(sdev, 0);
+	*rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
 }
 
 /**
@@ -2547,8 +2549,7 @@ static void ibmvfc_terminate_rport_io(struct fc_rport *rport)
 		dev_rport = starget_to_rport(scsi_target(sdev));
 		if (dev_rport != rport)
 			continue;
-		ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
-		ibmvfc_abort_task_set(sdev);
+		ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
 	}
 
 	rc = ibmvfc_wait_for_ops(vhost, rport, ibmvfc_match_rport);

drivers/scsi/ibmvscsi/ibmvfc.h

@@ -208,10 +208,10 @@ struct ibmvfc_npiv_login_resp {
 	u16 error;
 	u32 flags;
 #define IBMVFC_NATIVE_FC		0x01
-#define IBMVFC_CAN_FLUSH_ON_HALT	0x08
 	u32 reserved;
 	u64 capabilities;
 #define IBMVFC_CAN_FLUSH_ON_HALT	0x08
+#define IBMVFC_CAN_SUPPRESS_ABTS	0x10
 	u32 max_cmds;
 	u32 scsi_id_sz;
 	u64 max_dma_len;
@@ -351,6 +351,7 @@ struct ibmvfc_tmf {
 #define IBMVFC_TMF_LUN_RESET		0x10
 #define IBMVFC_TMF_TGT_RESET		0x20
 #define IBMVFC_TMF_LUA_VALID		0x40
+#define IBMVFC_TMF_SUPPRESS_ABTS	0x80
 	u32 cancel_key;
 	u32 my_cancel_key;
 	u32 pad;