linux-kernel - Re: Conversion of LIO-Target to use include/scsi/iscsi

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Date:	Fri, 20 Aug 2010 02:14:34 -0700
From:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	michaelc@...wisc.edu, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, hch@....de, James.Bottomley@...e.de,
	hare@...e.de
Subject: Re: Conversion of LIO-Target to use include/scsi/iscsi_proto.h defs

On Fri, 2010-08-20 at 16:32 +0900, FUJITA Tomonori wrote:
> On Thu, 19 Aug 2010 15:45:47 -0700
> "Nicholas A. Bellinger" <nab@...ux-iscsi.org> wrote:
> 
> > So, assuming that the conversion of all struct iscsi_init_* and struct
> > iscsi_target* to use include/scsi/iscsi_proto.h defs just involves
> > checking structure size and renaming the member use in
> > drivers/target/lio-target, would it be acceptable to do something like:
> > 
> > /* iSCSI PDU Header */
> > struct iscsi_cmd {
> >         uint8_t opcode;
> >         uint8_t flags;
> >         __be16 rsvd2;
> >         uint8_t hlength;
> >         uint8_t dlength[3];
> >         uint8_t lun[8];
> >         itt_t    itt;   /* Initiator Task Tag */
> >         __be32 data_length;
> >         __be32 cmdsn;
> >         __be32 exp_statsn;
> >         uint8_t cdb[ISCSI_CDB_SIZE];    /* SCSI Command Block */
> >         /* Additional Data (Command Dependent) */
> > #ifdef ISCSI_TARGET_MODE
> >         __be32 header_digest;
> > #endif
> > };
> 
> It's up to Mike but it looks hacky to me. struct iscsi_pdu is defined
> in the exact way as the spec does.
> 
> I don't think that iscsi_proto.h conversion is a must for the mainline
> inclusion. I prefer to let it alone for now.

Hmmmm, Ok..  Then I will defer to mnc's judgement here about what level
of integration of LIO-Target for protocol and PDU defs for what he
currently handles with Open-iSCSI.  Mike, do you have any more thoughts
here..?

I am pretty sure there are more important items to focus on inside from
this particuarly time-consuming and tedious cleanup, but am happy to
start a smaller cleanup of drivers/target/lio-target/iscsi_protocol.h
for starters..

Also, LIO-Target is still using an internal CRC32C implementation, which
needs to be converted to libcrypto and crc32c.ko.  Which also reminds
me, it would be nice to get the slicing by 8 CRC32C support into
libcrypto, and properly support for the Nehalem's CRC32C instruction
capabilities too.  Any takers..?  ;)

Best,

--nab


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