linux-kernel - Re: [RFC 7/7] crypto: Add PCLMULQDQ accelerated GHASH implementation

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Date:	Tue, 07 Jul 2009 11:31:52 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>
Subject: Re: [RFC 7/7] crypto: Add PCLMULQDQ accelerated GHASH
 implementation

Hi, Herbert,

On Sun, 2009-06-21 at 21:51 +0800, Herbert Xu wrote:
> Huang Ying <ying.huang@...el.com> 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 deferred to the cryptd kernel thread.
> > 
> > Signed-off-by: Huang Ying <ying.huang@...el.com>
> 
> All good.
> 
> So once we fully convert everything to shash, this series can
> go in with the minor changes mentioned in this thread.

What's your plan to convert everything to shash? For 2.6.32? How about
the progress? What can I do to help?

Best Regards,
Huang Ying


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