From: Matthew Wilcox <matthew@wil.cx>
To: Douglas Gilbert <dgilbert@interlog.com>
Cc: ltuikov@yahoo.com, Greg KH <greg@kroah.com>,
linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org,
tj@kernel.org, jens.axboe@oracle.com, James.Bottomley@suse.de
Subject: Re: SCSI TMF processing; tag allocation
Date: Mon, 15 Nov 2010 12:09:02 -0700 [thread overview]
Message-ID: <20101115190901.GB6178@parisc-linux.org> (raw)
In-Reply-To: <4CE181A8.8050102@interlog.com>
On Mon, Nov 15, 2010 at 01:53:28PM -0500, Douglas Gilbert wrote:
> On the subject of UAS, due to some USB-3 streaming protocol
> requirements, three tag values cannot be used by SCSI. They
> are 0h, FFFEh and FFFFh. So those available for SCSI tag
> use are 1h to FFFDh inclusive.
I add 1 to the tag value handed to me by the block layer, and use that
as the tag value that I tell the UAS device this command has. So if I
ask for 256 tags, I'll hand values 1-257 to the device.
--
Matthew Wilcox Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours. We can't possibly take such
a retrograde step."
prev parent reply other threads:[~2010-11-15 19:09 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-06 6:02 SCSI TMF processing; tag allocation Luben Tuikov
2010-11-13 12:37 ` Matthew Wilcox
2010-11-15 9:28 ` Jens Axboe
2010-11-15 14:33 ` James Bottomley
2010-11-15 14:40 ` Alan Cox
2010-11-15 14:53 ` James Bottomley
2010-11-15 14:46 ` Matthew Wilcox
2010-11-15 14:52 ` James Bottomley
2010-11-16 20:28 ` Vladislav Bolkhovitin
2010-11-15 18:53 ` Douglas Gilbert
2010-11-15 19:09 ` Matthew Wilcox [this message]
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