linux-kernel - RE: [PATCH 10/18] ioat3: xor support

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Message-ID: <129600E5E5FB004392DDC3FB599660D7B5548796@irsmsx504.ger.corp.intel.com>
Date:	Tue, 15 Sep 2009 17:08:48 +0100
From:	"Sosnowski, Maciej" <maciej.sosnowski@...el.com>
To:	"Williams, Dan J" <dan.j.williams@...el.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-raid@...r.kernel.org" <linux-raid@...r.kernel.org>
Subject: RE: [PATCH 10/18] ioat3: xor support

Williams, Dan J wrote:
> ioat3.2 adds xor offload support for up to 8 sources.  It can also
> perform an xor-zero-sum operation to validate whether all given sources
> sum to zero, without writing to a destination.  Xor descriptors differ
> from memcpy in that one operation may require multiple descriptors
> depending on the number of sources.  When the number of sources exceeds
> 5 an extended descriptor is needed.  These descriptors need to be
> accounted for when updating the DMA_COUNT register.
> 
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>
> ---

Signed-off-by: Maciej Sosnowski <maciej.sosnowski@...el.com>--
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