From: Jeff Garzik <jgarzik@pobox.com>
To: Luben Tuikov <luben_tuikov@adaptec.com>
Cc: Jens Axboe <axboe@suse.de>, Pat LaVarre <p.lavarre@ieee.org>,
linux-scsi@vger.kernel.org
Subject: Re: bytes/CDB of SCSI pass thru grossly limited maybe
Date: Mon, 23 Aug 2004 15:06:46 -0400 [thread overview]
Message-ID: <412A4046.6040007@pobox.com> (raw)
In-Reply-To: <412A3BE5.4090203@adaptec.com>
Luben Tuikov wrote:
>> I would like to see support for CDBs larger than 16 bytes in struct
>> request.
>>
>> Problem: Would like to support SCSI's variable length CDBs, and support
>> non-{ATA,SCSI} RAID CDBs which are often larger than 16 bytes, such as
>> Promise's SX8 (formerly known as carmel).
>>
>> Suggested solution: Probably this involves adding a flag and a pointer,
>> rather than increasing the actual CDB buffer size in struct request.
>
>
> Not sure that you need a flag.
> Op. code 0x7F implies (cdb->acdb != 0 && cdb[7] > 0), else bug.
At the struct request level a flag is needed. A "CDB" may be a SCSI
CDB, an ATA taskfile, an I2O command, etc. The block layer must treat
any cdb buffer as an anonymous blob that gets passed through to a lower
layer.
Jeff
next prev parent reply other threads:[~2004-08-23 19:07 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-30 23:04 bytes/CDB of SCSI pass thru grossly limited maybe Pat LaVarre
2004-07-31 14:12 ` Jens Axboe
2004-08-16 17:55 ` Pat LaVarre
2004-08-17 18:07 ` Pat LaVarre
2004-08-23 15:46 ` Jens Axboe
2004-08-23 16:05 ` Pat LaVarre
2004-08-23 17:08 ` Jens Axboe
2004-08-23 17:28 ` Pat LaVarre
2004-08-23 18:17 ` Jens Axboe
2004-08-26 23:20 ` Pat LaVarre
2004-08-23 16:06 ` Jeff Garzik
2004-08-23 17:05 ` Pat LaVarre
2004-08-23 18:48 ` Luben Tuikov
2004-08-23 19:06 ` Jeff Garzik [this message]
2004-08-23 19:14 ` Luben Tuikov
[not found] <A8E06BE4-F7BA-11D8-AC6B-00039398BB5E@ieee.org>
[not found] ` <Pine.LNX.4.44L0 .0408271100590.1238-100000@ida.rowland.org>
2004-08-27 15:09 ` Alan Stern
2004-08-28 14:31 ` Jens Axboe
2004-08-28 15:14 ` Alan Stern
2004-08-28 15:36 ` Jens Axboe
2004-08-28 17:51 ` James Bottomley
2004-08-28 17:55 ` Jens Axboe
2004-08-28 18:20 ` James Bottomley
2004-08-28 18:41 ` Jens Axboe
2004-08-29 13:34 ` James Bottomley
2004-08-29 13:45 ` Jens Axboe
2004-08-30 18:15 ` Pat LaVarre
2004-09-01 15:20 ` Pat LaVarre
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