[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>

diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
index c0e06de..4e31caa 100644 (file)
--- 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 3be8af6..219005d 100644 (file)
--- 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;