linux-kernel - RE: [PATCH 2/3] RFC4106 AES-GCM Driver Using Intel New Instructions

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Date:	Wed, 20 Oct 2010 11:49:10 +0100
From:	"Hoban, Adrian" <adrian.hoban@...el.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>,
	"linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Struk, Tadeusz" <tadeusz.struk@...el.com>,
	"O Mahony, Aidan" <aidan.o.mahony@...el.com>,
	"Paoloni, Gabriele" <gabriele.paoloni@...el.com>
Subject: RE: [PATCH 2/3] RFC4106 AES-GCM Driver Using Intel New Instructions

Hi Herbert,

We have been using binutils v2.19. 

Can you please recommend the version(s) of binutils (gas) that we should test with before submitting a patch? V2.16.1, or perhaps the older version (2.12) described in /Documentation/Changes? 

We will retest with the recommended version, update the code and resubmit the patch ASAP. 

Cheers,
Adrian

-----Original Message-----
From: Herbert Xu [mailto:herbert@...dor.apana.org.au] 
Sent: Tuesday, October 19, 2010 1:49 PM
To: Struk, Tadeusz
Cc: linux-kernel@...r.kernel.org; linux-crypto@...r.kernel.org; O Mahony, Aidan; Paoloni, Gabriele; Hoban, Adrian
Subject: Re: [PATCH 2/3] RFC4106 AES-GCM Driver Using Intel New Instructions

On Tue, Oct 12, 2010 at 09:31:41AM +0100, tadeusz.struk@...el.com wrote:
> Hi Herbert,
> Resubmitting the two other patches as requested.
> Thanks,
> Tadeusz
> 
> >From 06444d8a95458d807ae14699e557739281d0b026 Mon Sep 17 00:00:00 2001
> From: Adrian Hoban <ahoban@...en.ir.intel.com>
> Date: Fri, 10 Sep 2010 18:08:45 +0100
> Subject: [PATCH 2/3] RFC4106 AES-GCM Driver Using Intel New Instructions
> 
> This patch adds an optimized RFC4106 AES-GCM implementation for 64-bit
> kernels. It supports 128-bit AES key size. This leverages the crypto
> AEAD interface type to facilitate a combined AES & GCM operation to
> be implemented in assembly code. The assembly code leverages Intel(R)
> AES New Instructions and the PCLMULQDQ instruction.

OK this patch applies now at least.  However it doesn't build:

  AS [M]  arch/x86/crypto/aesni-intel_asm.o
arch/x86/crypto/aesni-intel_asm.S: Assembler messages:
arch/x86/crypto/aesni-intel_asm.S:803: Error: no such instruction: `aesenc 16*1(%rdi),%xmm6'
arch/x86/crypto/aesni-intel_asm.S:803: Error: no such instruction: `aesenc 16*1(%rdi),%xmm7'
arch/x86/crypto/aesni-intel_asm.S:803: Error: no such instruction: `aesenc 16*1(%rdi),%xmm8'
...

I suppose you can't rely on these new binutils instructions just
yet.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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