linux-kernel - [PATCH 0/3] tcm/pscsi: Add support for BIDI-COMMAND passthrough

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Date:	Tue, 21 Sep 2010 23:08:34 -0700
From:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Boaz Harrosh <bharrosh@...asas.com>
Cc:	James Bottomley <James.Bottomley@...e.de>,
	Douglas Gilbert <dgilbert@...erlog.com>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Mike Christie <michaelc@...wisc.edu>,
	Hannes Reinecke <hare@...e.de>,
	Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: [PATCH 0/3] tcm/pscsi: Add support for BIDI-COMMAND passthrough

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

Greetings Boaz and Co,

This patch series adds proper support to TCM Core for XDWRITEREAD_32 and
XDWRITEREAD_10 to allow for TCM/pSCSI plugin -> SCSI ML via struct request.

This first patch adds the necessary pieces to TCM Core for handling the
transparent memory mapping using the new struct se_task->task_sg_bidi[],
and other necessary bits for the underlying per new se_task BIDI context
into TCM/pSCSI.

The second patch adds support in TCM/pSCSI plugin code to handle the
extra struct request allocation, setup and release for the additional
BIDI SCSI READ SCSI READ payload going into struct se_task->task_sg_bidi[]
memory.

And the third patch adds the same passthrough option as above with TCM/pSCSI
for XDWRITEREAD_10 CDBs in TCM Core.

So far this has been tested with TCM_Loop -> TCM_core -> TCM/pSCSI ->
scsi_debug on v2.6.36-rc4 in x86 HVM.

Many thanks to Boaz for his comments with BIDI-COMMANDs and > 16 byte CDBs!

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

Nicholas Bellinger (3):
  tcm: Add support for BIDI-COMMAND passthrough
  tcm/pscsi: Add proper BIDI-COMMAND passthrough to SCSI MidLayer
  tcm: Add XDWRITEREAD_10 passthrough support

 drivers/target/target_core_pscsi.c     |  111 ++++++++++++++++++++++++-------
 drivers/target/target_core_pscsi.h     |    1 +
 drivers/target/target_core_transport.c |  112 ++++++++++++++++++++++++++++----
 include/target/target_core_base.h      |    1 +
 4 files changed, 185 insertions(+), 40 deletions(-)

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