linux-kernel - Re: [PATCH -v4] crypto: Add PCLMULQDQ accelerated GHASH implementation

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Message-ID: <20091019025332.GA26624@gondor.apana.org.au>
Date:	Mon, 19 Oct 2009 11:53:33 +0900
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Huang Ying <ying.huang@...el.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
	Daniel Walker <dwalker@...o99.com>
Subject: Re: [PATCH -v4] crypto: Add PCLMULQDQ accelerated GHASH
	implementation

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@...el.com>

Patch applied to cryptodev.  Thanks!
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