From: Huang Ying <ying.huang@intel.com>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-crypto@vger.kernel.org" <linux-crypto@vger.kernel.org>
Subject: Re: [PATCH -v2 5/5] crypto: Add PCLMULQDQ accelerated GHASH implementation
Date: Thu, 06 Aug 2009 15:20:23 +0800 [thread overview]
Message-ID: <1249543224.20937.0.camel@yhuang-dev.sh.intel.com> (raw)
In-Reply-To: <20090806071741.GB25065@gondor.apana.org.au>
On Thu, 2009-08-06 at 15:17 +0800, Herbert Xu wrote:
> 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@intel.com>
>
> Please resubmit this patch once irq_is_fpu_using() hits mainline.
OK. I will do that.
Best Regards,
Huang Ying
next prev parent reply other threads:[~2009-08-06 7:20 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-03 7:45 [PATCH -v2 1/5] crypto: Add GHASH digest algorithm for GCM Huang Ying
2009-08-03 7:45 ` [PATCH -v2 2/5] crypto: Use GHASH digest algorithm in GCM Huang Ying
2009-08-03 7:45 ` [PATCH -v2 3/5] crypto: cryptd: Add support to access underlaying shash Huang Ying
2009-08-03 7:45 ` [PATCH -v2 4/5] x86: Move kernel_fpu_using to irq_is_fpu_using in asm/i387.h Huang Ying
2009-08-03 7:45 ` [PATCH -v2 5/5] crypto: Add PCLMULQDQ accelerated GHASH implementation Huang Ying
2009-08-06 7:17 ` Herbert Xu
2009-08-06 7:20 ` Huang Ying [this message]
2009-08-06 5:37 ` [PATCH -v2 4/5] x86: Move kernel_fpu_using to irq_is_fpu_using in asm/i387.h Herbert Xu
2009-08-06 6:27 ` H. Peter Anvin
2009-08-06 7:16 ` Herbert Xu
2009-08-06 5:35 ` [PATCH -v2 3/5] crypto: cryptd: Add support to access underlaying shash Herbert Xu
2009-08-06 5:34 ` [PATCH -v2 2/5] crypto: Use GHASH digest algorithm in GCM Herbert Xu
2009-08-06 5:33 ` [PATCH -v2 1/5] crypto: Add GHASH digest algorithm for GCM Herbert Xu
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