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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20160418072434.GA17954@gondor.apana.org.au>
Date:	Mon, 18 Apr 2016 15:24:34 +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 03:21:16PM +0800, Baolin Wang wrote:
>
> I don't think so, the dm-crypt can not send maximal requests at some
> situations. For example, the 'cbc(aes)' cipher, it must be handled
> sector by sector (IV is dependency for each sector), so the dm-crypt
> can not send maximal requests, but must sector by sector in this
> situation.

If you can't merge them as requests, then how is the hardware going
to benefit from batching them? Or are you talking about parallel
processing similar to sha-mb?

Even with batching we should be involving the user because only the
user knows (if anyone does) whether more data will be forthcoming.

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