linux-kernel - Re: [PATCH 06/13] async_tx: add support for asynchronous GF multiplication

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Message-ID: <49C4BF15.5050502@emcraft.com>
Date:	Sat, 21 Mar 2009 13:19:01 +0300
From:	Ilya Yanok <yanok@...raft.com>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	"H. Peter Anvin" <h.peter.anvin@...el.com>,
	"Williams, Dan J" <dan.j.williams@...el.com>,
	"linux-raid@...r.kernel.org" <linux-raid@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"neilb@...e.de" <neilb@...e.de>,
	"Sosnowski, Maciej" <maciej.sosnowski@...el.com>,
	Yuri Tikhonov <yur@...raft.com>
Subject: Re: [PATCH 06/13] async_tx: add support for asynchronous GF 	multiplication

Hi H. Peter,

H. Peter Anvin wrote:
> Ilya Yanok wrote:
>   
>> async_gen_syndrome() takes element of GF^n(256) and returns result of
>> scalar multiplication of it with constant ({01}, {02}, {02}^2, ...,
>> {02}^n) vector.
>>     
>
> For any n (which would mean any GF field)?  In that case, that is
> generic scalar-vector multiplication...
>   

Ok. I think I got it. Vectors are things that depend on position inside
buffer and scalars are things that don't, am I right? In that sense we
don't have any vector-vector multiplication. Both async_gen_syndrome()
and async_pq() use constant coefficients. So I don't really understand
the problem here.

Regards, Ilya.

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