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From: Herbert Xu <herbert@gondor.apana.org.au>
To: Huang Ying <ying.huang@intel.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-crypto@vger.kernel.org" <linux-crypto@vger.kernel.org>,
	Daniel Walker <dwalker@fifo99.com>
Subject: Re: [PATCH -v4] crypto: Add PCLMULQDQ accelerated GHASH implementation
Date: Mon, 19 Oct 2009 11:53:33 +0900	[thread overview]
Message-ID: <20091019025332.GA26624@gondor.apana.org.au> (raw)
In-Reply-To: <1253064946.15717.372.camel@yhuang-dev.sh.intel.com>

On Wed, Sep 16, 2009 at 09:35:46AM +0800, Huang Ying wrote:
> PCLMULQDQ is used to accelerate the most time-consuming part of GHASH,
> carry-less multiplication. More information about PCLMULQDQ can be
> found at:
> 
> http://software.intel.com/en-us/articles/carry-less-multiplication-and-its-usage-for-computing-the-gcm-mode/
> 
> Because PCLMULQDQ changes XMM state, its usage must be enclosed with
> kernel_fpu_begin/end, which can be used only in process context, the
> acceleration is implemented as crypto_ahash. That is, request in soft
> IRQ context will be defered to the cryptd kernel thread.
> 
> v4:
>  - Fix some style issues.
> 
> v3:
>  - Revise GHASH implementation, performance increase about 2x.
> 
> Signed-off-by: Huang Ying <ying.huang@intel.com>

Patch applied to cryptodev.  Thanks!
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

  reply	other threads:[~2009-10-19  2:53 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-09-16  1:35 [PATCH -v4] crypto: Add PCLMULQDQ accelerated GHASH implementation Huang Ying
2009-10-19  2:53 ` Herbert Xu [this message]
2009-11-01  0:30   ` Andrew Morton
2009-11-01 17:50     ` Herbert Xu
2009-11-02  7:50       ` Ingo Molnar
2009-11-02 14:28         ` Herbert Xu
2009-11-02 14:32           ` Ingo Molnar
2009-11-02 14:46             ` Herbert Xu
2009-11-02 15:46               ` Ingo Molnar
2009-11-03 14:12                 ` Herbert Xu
2009-11-03  5:47             ` Huang Ying
2009-11-03  9:03               ` Ingo Molnar
2009-11-04  0:59                 ` H. Peter Anvin

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