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

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Message-ID: <e9c3a7c20903211546k75b5ac48uab083303b6ec5746@mail.gmail.com>
Date:	Sat, 21 Mar 2009 15:46:12 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	Ilya Yanok <yanok@...raft.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	"H. Peter Anvin" <h.peter.anvin@...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

On Sat, Mar 21, 2009 at 3:26 PM, Ilya Yanok <yanok@...raft.com> wrote:
>> The caller needs to be modified to only require scalar multiplication
>> even in this corner case.
>>
>
> Argh... There is no vector-vector multiplication at all! You just need
> to swap the 'for' cycles back (as it was in the original patch by me and
> Yuri) to get rid of two-dimensional lookup at each step.

Yes, I swapped the loops as part of the removal of the
ASYNC_TX_ZERO_{P,Q} flags and wanted to avoid an explicit memset.
I'll rework this path...

Regards,
Dan
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