linux.git/drivers/target/loopback, branch v3.15

target: Pass in transport supported PI at session initialization

2014-04-07T08:48:54+00:00

In order to support local WRITE_INSERT + READ_STRIP operations for
non PI enabled fabrics, the fabric driver needs to be able signal
what protection offload operations are supported.

This is done at session initialization time so the modes can be
signaled by individual se_wwn + se_portal_group endpoints, as well
as optionally across different transports on the same endpoint.

For iser-target, set TARGET_PROT_ALL if the underlying ib_device
has already signaled PI offload support, and allow this to be
exposed via a new iscsit_transport->iscsit_get_sup_prot_ops()
callback.

For loopback, set TARGET_PROT_ALL to signal SCSI initiator mode
operation.

For all other drivers, set TARGET_PROT_NORMAL to disable fabric
level PI.

Cc: Martin K. Petersen 
Cc: Sagi Grimberg 
Cc: Or Gerlitz 
Cc: Quinn Tran 
Cc: Giridhar Malavali 
Signed-off-by: Nicholas Bellinger

target: Add TFO->abort_task for aborted task resources release

2014-04-07T08:48:51+00:00

Now that TASK_ABORTED status is not generated for all cases by
TMR ABORT_TASK + LUN_RESET, a new TFO->abort_task() caller is
necessary in order to give fabric drivers a chance to unmap
hardware / software resources before the se_cmd descriptor is
released via the normal TFO->release_cmd() codepath.

This patch adds TFO->aborted_task() in core_tmr_abort_task()
in place of the original transport_send_task_abort(), and
also updates all fabric drivers to implement this caller.

The fabric drivers that include changes to perform cleanup
via ->aborted_task() are:

  - iscsi-target
  - iser-target
  - srpt
  - tcm_qla2xxx

The fabric drivers that currently set ->aborted_task() to
NOPs are:

  - loopback
  - tcm_fc
  - usb-gadget
  - sbp-target
  - vhost-scsi

For the latter five, there appears to be no additional cleanup
required before invoking TFO->release_cmd() to release the
se_cmd descriptor.

v2 changes:
  - Move ->aborted_task() call into transport_cmd_finish_abort (Alex)

Cc: Alex Leung 
Cc: Mark Rustad 
Cc: Roland Dreier 
Cc: Vu Pham 
Cc: Chris Boot 
Cc: Sebastian Andrzej Siewior 
Cc: Michael S. Tsirkin 
Cc: Giridhar Malavali 
Cc: Saurav Kashyap 
Cc: Quinn Tran 
Cc: Sagi Grimberg 
Cc: Or Gerlitz 
Signed-off-by: Nicholas Bellinger

Target/dif: Introduce protection-passthough-only mode

2014-04-07T08:48:42+00:00

Some transports (iSCSI/iSER/SRP/FC) support hardware INSERT/STRIP
capabilities while other transports like loopback/vhost-scsi need
perform this is software.

This patch allows fabrics using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
to signal the early LUN scan handling case where PROTECT CDB bits
are set, but no fabric buffer has been provided.

For transports which use generic new command these buffers have yet
to be allocated.

Also this way, target may support protection information
against legacy initiators (writes are inserted and reads
are stripped).

(Only set prot_pto for loopback during early special case - nab)

Signed-off-by: Sagi Grimberg 
Signed-off-by: Nicholas Bellinger

tcm_loop: Enable DIF/DIX modes in SCSI host LLD

2014-01-19T02:22:06+00:00

This patch updates tcm_loop_driver_probe() to set protection
information using scsi_host_set_prot() and scsi_host_set_guard(),
which currently enabled all modes of DIF/DIX protection, minus
DIX TYPE0.

Also, update tcm_loop_submission_work() to pass struct scsi_cmnd
related protection into target_submit_cmd_map_sgls() during CDB
dispatch.

Reviewed-by: Martin K. Petersen 
Cc: Christoph Hellwig 
Cc: Hannes Reinecke 
Cc: Sagi Grimberg 
Cc: Or Gerlitz 
Signed-off-by: Nicholas Bellinger

target: Add protection SGLs to target_submit_cmd_map_sgls

2014-01-18T09:58:09+00:00

This patch adds support to target_submit_cmd_map_sgls() for
accepting 'sgl_prot' + 'sgl_prot_count' parameters for
DIF protection information.

Note the passed parameters are stored at se_cmd->t_prot_sg
and se_cmd->t_prot_nents respectively.

Also, update tcm_loop and vhost-scsi fabrics usage of
target_submit_cmd_map_sgls() to take into account the
new parameters.

Cc: Martin K. Petersen 
Cc: Christoph Hellwig 
Cc: Hannes Reinecke 
Cc: Sagi Grimberg 
Cc: Or Gerlitz 
Signed-off-by: Nicholas Bellinger

drivers: target: Mark functions as static in tcm_loop.c

2014-01-10T05:48:37+00:00

Mark functions tcm_loop_make_naa_tpg(), tcm_loop_drop_naa_tpg(),
tcm_loop_make_scsi_hba() and tcm_loop_drop_scsi_hba() as static in
loopback/tcm_loop.c because they are not used outside this file.

This eliminates the following warning in loopback/tcm_loop.c:
drivers/target/loopback/tcm_loop.c:1231:25: warning: no previous prototype for ‘tcm_loop_make_naa_tpg’ [-Wmissing-prototypes]
drivers/target/loopback/tcm_loop.c:1276:6: warning: no previous prototype for ‘tcm_loop_drop_naa_tpg’ [-Wmissing-prototypes]
drivers/target/loopback/tcm_loop.c:1308:16: warning: no previous prototype for ‘tcm_loop_make_scsi_hba’ [-Wmissing-prototypes]
drivers/target/loopback/tcm_loop.c:1378:6: warning: no previous prototype for ‘tcm_loop_drop_scsi_hba’ [-Wmissing-prototypes]

Signed-off-by: Rashika Kheria 
Reviewed-by: Josh Triplett 
Signed-off-by: Nicholas Bellinger

tcm_loop: Implement target reset

2013-10-16T22:42:52+00:00

Implement target reset by resetting the transport status.

(nab: Remove unused ret in tcm_loop_target_reset)

Signed-off-by: Hannes Reinecke 
Signed-off-by: Nicholas Bellinger

tcm_loop: TCQ and command abort support

2013-10-16T22:41:50+00:00

Implement TCQ support, which enables us to do proper command
abort, too.

Signed-off-by: Hannes Reinecke 
Signed-off-by: Nicholas Bellinger

tcm_loop: separate out tcm_loop_issue_tmr

2013-10-16T22:41:49+00:00

No functional change.

Signed-off-by: Hannes Reinecke 
Signed-off-by: Nicholas Bellinger

tcm_loop: Implement transport offline

2013-10-16T22:41:26+00:00

Add attribute 'transport_status' to simulate link failure.

Signed-off-by: Hannes Reinecke 
Signed-off-by: Nicholas Bellinger