linux-kernel - Re: SCSI TMF processing; tag allocation

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Message-ID: <20101115190901.GB6178@parisc-linux.org>
Date:	Mon, 15 Nov 2010 12:09:02 -0700
From:	Matthew Wilcox <matthew@....cx>
To:	Douglas Gilbert <dgilbert@...erlog.com>
Cc:	ltuikov@...oo.com, Greg KH <greg@...ah.com>,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	tj@...nel.org, jens.axboe@...cle.com, James.Bottomley@...e.de
Subject: Re: SCSI TMF processing; tag allocation

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."
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