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

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Message-ID: <4CE2E985.4050102@vlnb.net>
Date:	Tue, 16 Nov 2010 23:28:53 +0300
From:	Vladislav Bolkhovitin <vst@...b.net>
To:	Matthew Wilcox <matthew@....cx>
CC:	Luben Tuikov <ltuikov@...oo.com>, Greg KH <greg@...ah.com>,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	tj@...nel.org,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Jens Axboe <jaxboe@...ionio.com>
Subject: Re: SCSI TMF processing; tag allocation

Matthew Wilcox, on 11/13/2010 03:37 PM wrote:
> SPC-4 seems to indicate (in the INQUIRY command, 6.4.2) that support
> for queueing is now non-optional, and even support for basic queueing
> has been removed, replaced only with the 'command management model'.
> I must confess to being somewhat confused by the difference between the
> 'basic queue' model and 'command management' model

The 'command management model' is what was called 'full task management
model' in SAM-3. The difference of it with 'basic task management model'
in SAM-3 is that (basically) in the latter:

 - Support only for SIMPLE or ORDERED commands (not both)

 - For SIMPLE commands their reorder can't be controlled

 - On any error all queued commands must be aborted and this behavior
can't be controlled.

Vlad

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