* Brian King (brking@xxxxxxxxxxxxxxxxxx) wrote:
>
> 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@xxxxxxxxxxxxxxxxxx>
Acked-by: Robert Jennings <rcj@xxxxxxxxxxxxxxxxxx>
> ---
>
> drivers/scsi/ibmvscsi/ibmvfc.c | 13 +++++++------
> drivers/scsi/ibmvscsi/ibmvfc.h | 3 ++-
> 2 files changed, 9 insertions(+), 7 deletions(-)
>
> diff -puN drivers/scsi/ibmvscsi/ibmvfc.c~ibmvfc_supress_abts drivers/scsi/ibmvscsi/ibmvfc.c
> --- linux-2.6/drivers/scsi/ibmvscsi/ibmvfc.c~ibmvfc_supress_abts 2013-01-25 14:29:11.000000000 -0600
> +++ linux-2.6-bjking1/drivers/scsi/ibmvscsi/ibmvfc.c 2013-01-25 14:29:24.000000000 -0600
> @@ -2190,10 +2190,12 @@ static int ibmvfc_cancel_all(struct scsi
> 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(struc
> 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_handle
> 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_handle
> 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(st
> 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 -puN drivers/scsi/ibmvscsi/ibmvfc.h~ibmvfc_supress_abts drivers/scsi/ibmvscsi/ibmvfc.h
> --- linux-2.6/drivers/scsi/ibmvscsi/ibmvfc.h~ibmvfc_supress_abts 2013-01-25 14:29:11.000000000 -0600
> +++ linux-2.6-bjking1/drivers/scsi/ibmvscsi/ibmvfc.h 2013-01-25 14:29:11.000000000 -0600
> @@ -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;
> _
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