From: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
To: James.Smart@Emulex.Com
Cc: bharrosh@panasas.com, fujita.tomonori@lab.ntt.co.jp,
James.Bottomley@HansenPartnership.com, michaelc@cs.wisc.edu,
linux-scsi@vger.kernel.org, jens.axboe@oracle.com,
bzolnier@gmail.com, agk@redhat.com,
Geert.Uytterhoeven@sonycom.com
Subject: Re: [PATCH 3/3] iscsi_tcp: Enable large commands
Date: Tue, 15 Apr 2008 22:46:41 +0900 [thread overview]
Message-ID: <20080415224639Q.tomof@acm.org> (raw)
In-Reply-To: <4804A8C7.504@emulex.com>
On Tue, 15 Apr 2008 09:08:23 -0400
James Smart <James.Smart@Emulex.Com> wrote:
> Boaz Harrosh wrote:
> > Let through up to the largest command of 260 defined by the scsi standard.
> > iscsi core supports this already. Now that the scsi-ml supports it we can
> > start using large commands.
>
> Just to double-check:
> if we use sg_io to pass through requests from user-land, which are addressed to
> drivers or transports, and which may not be a SCSI command but rather just something
> utilizing the sg_io infrastructure for management or pass-thru, are we limited to
> 260 bytes for request/cmd payload ?
With SG_IO (block, sg.c, and bsg), the command length is still limited
to 16 bytes (BLK_MAX_CDB). We will remove the limit in bsg shortly.
As you know, bsg supports bidi data transfer and there is no limit on
the length of request and response payload. SAS management protocol
uses request and response payload for data transfer. It doesn't use
the command area (that is used for SCSI command).
next prev parent reply other threads:[~2008-04-15 13:49 UTC|newest]
Thread overview: 76+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-25 16:21 [PATCHSET 0/3] Is it time for varlen extended and vendor-specific cdbs Boaz Harrosh
2008-03-25 16:22 ` [PATCH] Let scsi_cmnd->cmnd use request->cmd buffer Boaz Harrosh
2008-03-25 16:32 ` [PATCH 2/3] block layer varlen-cdb Boaz Harrosh
2008-04-03 16:43 ` James Bottomley
2008-04-03 17:26 ` Benny Halevy
2008-04-03 18:32 ` [PATCH 2/3 ver2] block layer extended-cdb support Boaz Harrosh
2008-04-04 11:46 ` Jens Axboe
2008-04-06 9:35 ` Boaz Harrosh
2008-04-06 11:05 ` Boaz Harrosh
2008-04-07 8:31 ` Jens Axboe
2008-04-12 5:52 ` FUJITA Tomonori
2008-04-13 9:13 ` Boaz Harrosh
2008-04-13 16:17 ` FUJITA Tomonori
2008-04-13 16:50 ` Boaz Harrosh
2008-04-14 9:49 ` [PATCH 2/3 ver3] " Boaz Harrosh
2008-04-14 11:04 ` FUJITA Tomonori
2008-04-14 11:28 ` Boaz Harrosh
2008-04-14 12:08 ` FUJITA Tomonori
2008-04-14 12:22 ` Boaz Harrosh
2008-04-14 11:04 ` [PATCH 2/3 ver2] " FUJITA Tomonori
2008-04-14 10:50 ` [PATCH 0/4] add large command support to the block layer FUJITA Tomonori
2008-04-14 10:50 ` [PATCH 1/4] block: no need to initialize rq->cmd in prepare_flush_fn hook FUJITA Tomonori
2008-04-14 10:50 ` [PATCH 2/4] block: no need to initialize rq->cmd with blk_get_request FUJITA Tomonori
2008-04-14 10:50 ` [PATCH 3/4] block: replace sizeof(rq->cmd) with BLK_MAX_CDB FUJITA Tomonori
2008-04-14 10:50 ` [PATCH 4/4] block: add large command support FUJITA Tomonori
2008-04-14 11:29 ` Jens Axboe
2008-04-14 12:08 ` FUJITA Tomonori
2008-04-15 22:50 ` Bartlomiej Zolnierkiewicz
2008-04-15 22:57 ` FUJITA Tomonori
2008-04-16 0:22 ` Bartlomiej Zolnierkiewicz
2008-04-16 8:33 ` Jens Axboe
2008-04-16 9:08 ` Boaz Harrosh
2008-04-16 9:42 ` Jens Axboe
2008-04-16 22:28 ` Bartlomiej Zolnierkiewicz
2008-04-17 3:59 ` FUJITA Tomonori
2008-04-17 7:07 ` Jens Axboe
2008-04-17 11:55 ` Bartlomiej Zolnierkiewicz
2008-04-17 11:58 ` Bartlomiej Zolnierkiewicz
2008-04-17 12:07 ` FUJITA Tomonori
2008-04-17 4:02 ` FUJITA Tomonori
2008-04-14 14:41 ` Pete Wyckoff
2008-04-14 22:33 ` FUJITA Tomonori
2008-04-15 13:44 ` Pete Wyckoff
2008-04-15 7:45 ` Boaz Harrosh
2008-04-15 10:05 ` FUJITA Tomonori
2008-04-15 7:29 ` Jens Axboe
2008-04-14 11:21 ` [PATCH 0/4] add large command support to the block layer FUJITA Tomonori
2008-04-14 11:38 ` Boaz Harrosh
2008-04-14 12:36 ` Boaz Harrosh
2008-04-14 13:06 ` FUJITA Tomonori
2008-04-15 12:24 ` [PATCH 0/3] scsi: variable-length CDBs support Boaz Harrosh
2008-04-15 12:30 ` [PATCH 1/3] Let scsi_cmnd->cmnd use request->cmd buffer Boaz Harrosh
2008-04-15 12:34 ` [PATCH 2/3] scsi: varlen extended and vendor-specific cdbs Boaz Harrosh
2008-04-16 2:09 ` FUJITA Tomonori
2008-04-16 6:40 ` Boaz Harrosh
2008-04-16 6:49 ` [PATCH 2/3 ver2] " Boaz Harrosh
2008-04-17 4:01 ` [PATCH 2/3] " FUJITA Tomonori
2008-04-17 12:25 ` [PATCH 2/3 ver3] " Boaz Harrosh
2008-04-17 12:49 ` Boaz Harrosh
2008-04-17 13:04 ` FUJITA Tomonori
2008-04-17 13:29 ` Boaz Harrosh
2008-04-15 12:37 ` [PATCH 3/3] iscsi_tcp: Enable large commands Boaz Harrosh
2008-04-15 13:08 ` James Smart
2008-04-15 13:38 ` Boaz Harrosh
2008-04-15 13:57 ` Benny Halevy
2008-04-15 13:46 ` FUJITA Tomonori [this message]
2008-04-13 14:07 ` [PATCH 2/3 ver2] block layer extended-cdb support James Bottomley
2008-04-13 16:17 ` FUJITA Tomonori
2008-03-25 16:36 ` [PATCH 3/3] scsi: varlen extended and vendor-specific cdbs Boaz Harrosh
2008-04-03 16:07 ` [PATCHSET 0/3] Is it time for " Boaz Harrosh
2008-04-13 16:30 ` [PATCHSET 0/4 ver2] " Boaz Harrosh
2008-04-13 16:37 ` [PATCH 1/4] Let scsi_cmnd->cmnd use request->cmd buffer Boaz Harrosh
2008-04-13 16:39 ` [PATCH 2/4] block layer extended-cdb support Boaz Harrosh
2008-04-13 16:39 ` [PATCH 3/4] scsi: varlen extended and vendor-specific cdbs Boaz Harrosh
2008-04-13 16:41 ` [PATCH 4/4] iscsi_tcp: Enable large command Boaz Harrosh
2008-04-18 17:11 ` Mike Christie
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