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    SubjectRe: [PATCH -v4] crypto: Add PCLMULQDQ accelerated GHASH implementation
    On Mon, 19 Oct 2009 11:53:33 +0900 Herbert Xu <herbert@gondor.apana.org.au> wrote:

    > On Wed, Sep 16, 2009 at 09:35:46AM +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.
    > >
    > > v4:
    > > - Fix some style issues.
    > >
    > > v3:
    > > - Revise GHASH implementation, performance increase about 2x.
    > >
    > > Signed-off-by: Huang Ying <ying.huang@intel.com>
    >
    > Patch applied to cryptodev. Thanks!

    x86_64 allmodconfig, GNU assembler 2.16.1:

    arch/x86/crypto/ghash-clmulni-intel_asm.S: Assembler messages:
    arch/x86/crypto/ghash-clmulni-intel_asm.S:103: Error: no such instruction: `pshufb %xmm5,%xmm0'
    arch/x86/crypto/ghash-clmulni-intel_asm.S:105: Error: no such instruction: `pshufb %xmm5,%xmm0'
    arch/x86/crypto/ghash-clmulni-intel_asm.S:119: Error: no such instruction: `pshufb %xmm5,%xmm0'
    arch/x86/crypto/ghash-clmulni-intel_asm.S:123: Error: no such instruction: `pshufb %xmm5,%xmm6'
    arch/x86/crypto/ghash-clmulni-intel_asm.S:130: Error: no such instruction: `pshufb %xmm5,%xmm0'
    arch/x86/crypto/ghash-clmulni-intel_asm.S:143: Error: no such instruction: `pshufb %xmm5,%xmm0'



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