[PATCH 0/2] tcm/tcm_loop: Add BIDI support and XDWRITE_READ_10 emulation

[PATCH 0/2] tcm/tcm_loop: Add BIDI support and XDWRITE_READ_10 emulation

[Nicholas A. Bellinger]

From: Nicholas Bellinger <nab@linux-iscsi.org>

Greetings Boaz, Tomo-san and Co,

This series adds initial support for functional bidirectional CDBs into TCM_Core
and the TCM_Loop fabric module.  So far this is limited to XDWRITE_READ_10 emulation
following scsi_debug.c, but everything appears to now be functioning as expected.

This first patch adds support for BIDI operations and XDWRITE_READ_10 emulation
into TCM_Core for the individual I/O descriptor setup, memory mapping, callback
and release codepaths.

The second patch enables BIDI operations with the TCM_Loop Virtual SCSI LLD
fabric module using the updated callers.

So far this has been lightly tested on v2.6.36-rc3 HVM using custom userspace BSG
code to issue XDWRITE_READ_10 I/O into TCM_Loop LUNs using FILEIO backstores.
Support for BIDI CDBs will also extend to LIO-Target and other TCM fabric modules
in the near future.

Comments are welcome!

Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>

Nicholas Bellinger (2):
  tcm: Add support for BIDI operation and XDWRITE_READ_10 emulation
  tcm_loop: Add DMA_BIDIRECTIONAL CDB support

 drivers/target/target_core_transport.c         |  282 +++++++++++++++++++++---
 drivers/target/tcm_loop/tcm_loop_fabric_scsi.c |   48 +++-
 include/target/target_core_base.h              |    9 +-
 include/target/target_core_transport.h         |   10 +-
 4 files changed, 297 insertions(+), 52 deletions(-)