linux-kernel - Re: [PATCH v9 4/4] crypto: Add Allwinner Security System crypto accelerator

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Message-ID: <20150524033253.GB20656@gondor.apana.org.au>
Date:	Sun, 24 May 2015 11:32:53 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc:	Corentin LABBE <clabbe.montjoie@...il.com>, robh+dt@...nel.org,
	pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	maxime.ripard@...e-electrons.com, linux@....linux.org.uk,
	davem@...emloft.net, akpm@...ux-foundation.org,
	gregkh@...uxfoundation.org, mchehab@....samsung.com,
	joe@...ches.com, tj@...nel.org, arnd@...db.de,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-crypto@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH v9 4/4] crypto: Add Allwinner Security System crypto
 accelerator

On Sat, May 23, 2015 at 04:35:36PM +0200, Boris Brezillon wrote:
>
> > Since all SG I get was always a multiple of 16 (AES BLOCK SIZE) it was a sort of confirmation.
> > 
> > Herbert ? does am I right or a chunking test is missing for cbc(aes) in testmgr.h
> 
> Okay, just sharing my vision of this thing (I'll let Herbert comment on
> this aspect): I'd say that theoretically nothing prevents one from
> splitting its sg list in chunks smaller than the block size, so I'd
> say you should use the same trick for AES. 

Indeed, you must be able to handle a block that straddles two SG
entries.  If the hardware is not capable then you have to linearise
it by copying or use a fallback.

I can't believe we don't have a generic test for this in testmgr.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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