linux-kernel - Re: [PATCH v2 0/4] Introduce bulk mode for crypto engine framework

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Message-ID: <20160418081753.GA18323@gondor.apana.org.au>
Date:	Mon, 18 Apr 2016 16:17:53 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Baolin Wang <baolin.wang@...aro.org>
Cc:	David Miller <davem@...emloft.net>,
	Alasdair G Kergon <agk@...hat.com>,
	Mike Snitzer <snitzer@...hat.com>, Jens Axboe <axboe@...com>,
	dm-devel@...hat.com, Andrew Morton <akpm@...ux-foundation.org>,
	david.s.gordon@...el.com, Tom Lendacky <thomas.lendacky@....com>,
	Robert Jarzmik <robert.jarzmik@...e.fr>,
	Masahiro Yamada <yamada.masahiro@...ionext.com>,
	smueller@...onox.de, tadeusz.struk@...el.com,
	Masanari Iida <standby24x7@...il.com>, shli@...nel.org,
	Mark Brown <broonie@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-crypto@...r.kernel.org, linux-raid@...r.kernel.org
Subject: Re: [PATCH v2 0/4] Introduce bulk mode for crypto engine framework

On Mon, Apr 18, 2016 at 04:14:48PM +0800, Baolin Wang wrote:
> On 18 April 2016 at 16:04, Herbert Xu <herbert@...dor.apana.org.au> wrote:
> > On Mon, Apr 18, 2016 at 03:58:59PM +0800, Baolin Wang wrote:
> >>
> >> That depends on the hardware engine. Some cipher hardware engines
> >> (like xts(aes) engine) can handle the intermediate values (IV) by
> >> themselves in one bulk block, which means we can increase the size of
> >> the request by merging request rather than always 512 bytes and thus
> >> increase the hardware engine processing speed. But for some other
> >> hardware engines (like cbc(aes) engine), they can not support bulk
> >> block, must sector by sector. So the engine drivers can select the
> >> suitable mode to do encryption/decryption.
> >
> > So what is this supposed to handle, xts or cbc?
> 
> As I know, now cbc engine also need to handle requests sector by
> sector, but for xts/ecb engine can support bulk block, which means can
> merge requests.

If it's just xts then why can't dm-crypt merge it and send a single
request?

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