linux-kernel - Re: [PATCH 9/9] tcm_qla2xxx: Add special case for COMPARE_AND_WRITE data

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Date:	Tue, 20 Aug 2013 23:37:02 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	"Nicholas A. Bellinger" <nab@...erainc.com>
Cc:	target-devel <target-devel@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	Christoph Hellwig <hch@....de>, Hannes Reinecke <hare@...e.de>,
	Martin Petersen <martin.petersen@...cle.com>,
	Chris Mason <chris.mason@...ionio.com>,
	James Bottomley <JBottomley@...allels.com>,
	Nicholas Bellinger <nab@...ux-iscsi.org>,
	Giridhar Malavali <giridhar.malavali@...gic.com>,
	Chad Dupuis <chad.dupuis@...gic.com>
Subject: Re: [PATCH 9/9] tcm_qla2xxx: Add special case for COMPARE_AND_WRITE
 data_direction

On Tue, Aug 20, 2013 at 08:08:00PM +0000, Nicholas A. Bellinger wrote:
> From: Nicholas Bellinger <nab@...erainc.com>
> 
> Add a special case for COMPARE_AND_WRITE for the reverse data direction
> mapping used for pci_map_sg() + friends.

A low level driver is an even worse place to hardcode a specific cdb
opcode.  As written before this should be done by a flag on the command.

Also it might make sense to lift this helper to get a dma direction from
a command into common code.

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