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

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Message-ID: <20150517124811.797fab32@bbrezillon>
Date:	Sun, 17 May 2015 12:48:11 +0200
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	LABBE Corentin <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

Hi Herbert,

On Sun, 17 May 2015 18:34:40 +0800
Herbert Xu <herbert@...dor.apana.org.au> wrote:

> On Sun, May 17, 2015 at 10:45:08AM +0200, Boris Brezillon wrote:
> >
> > From my POV this is not asynchronous at all (see my comments inline),
> > but maybe Herbert can confirm that.
> 
> Well we don't actually require drivers to be asynchronous.  It is
> obviously the preferred method but some hardware may not be capable
> of that.

Yep, but then they shouldn't be declared with CRYPTO_ALG_ASYNC and as an
ablkcipher algorithm (*Asynchronous* Block Cipher), right ?

Regarding the capabilities of this crypto engine, from what I've seen,
it is definitely capable of doing asynchronous requests ;-).

Best Regards,

Boris

-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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