[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>

2 files changed, 9 insertions, 7 deletions

diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
index c0e06de36874..4e31caa21ddf 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.c
+++ b/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);
diff --git a/drivers/scsi/ibmvscsi/ibmvfc.h b/drivers/scsi/ibmvscsi/ibmvfc.h
index 3be8af624e6f..219005da37c0 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.h
+++ b/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;