linux-kernel - Re: [PATCH -v2 5/5] crypto: Add PCLMULQDQ accelerated GHASH implementation

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Message-ID: <20090806071741.GB25065@gondor.apana.org.au>
Date:	Thu, 6 Aug 2009 17:17:41 +1000
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Huang Ying <ying.huang@...el.com>
Cc:	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org
Subject: Re: [PATCH -v2 5/5] crypto: Add PCLMULQDQ accelerated GHASH
	implementation

On Mon, Aug 03, 2009 at 03:45:31PM +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.
> 
> Signed-off-by: Huang Ying <ying.huang@...el.com>

Please resubmit this patch once irq_is_fpu_using() hits mainline.

Thanks,
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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