linux-kernel - Re: [PATCH 2/3] crypto: Add fpu template, a wrapper for blkcipher touching FPU

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Date:	Thu, 5 Mar 2009 12:54:02 +0100
From:	Sebastian Andrzej Siewior <linux-crypto@...breakpoint.cc>
To:	Huang Ying <ying.huang@...el.com>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] crypto: Add fpu template, a wrapper for blkcipher
	touching FPU

* Huang Ying | 2009-03-05 10:25:41 [+0800]:

>Blkcipher touching FPU need to be enclosed by kernel_fpu_begin() and
>kernel_fpu_end(). If they are invoked in cipher algorithm
>implementation, they will be invoked for each block, so that
>performance will be hurt, because they are "slow" operations. This
>patch implements "fpu" template, which makes these operations to be
>invoked for each request.
>
>Signed-off-by: Huang Ying <ying.huang@...el.com>
>
>---
> crypto/Kconfig  |    7 ++
> crypto/Makefile |    1 
> crypto/fpu.c    |  166 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 174 insertions(+)
>
>--- a/crypto/Kconfig
>+++ b/crypto/Kconfig
>@@ -236,6 +236,13 @@ config CRYPTO_XTS
> 	  key size 256, 384 or 512 bits. This implementation currently
> 	  can't handle a sectorsize which is not a multiple of 16 bytes.
> 
>+config CRYPTO_FPU
>+	tristate "FPU wrapper"
>+	select CRYPTO_BLKCIPHER
>+	select CRYPTO_MANAGER
>+	help
>+	  FPU: Wrapper for blkcipher touching FPU.
I as an end-user have to clue what this could be about. I suggest you
don't make it visible since the explanation won't be helpfull either :)

>+
> comment "Hash modes"
> 
> config CRYPTO_HMAC

Sebastian
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