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crypto: skcipher - introduce walksize attribute for SIMD algos

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In some cases, SIMD algorithms can only perform optimally when
allowed to operate on multiple input blocks in parallel. This is
especially true for bit slicing algorithms, which typically take
the same amount of time processing a single block or 8 blocks in
parallel. However, other SIMD algorithms may benefit as well from
bigger strides.

So add a walksize attribute to the skcipher algorithm definition, and
wire it up to the skcipher walk API. To avoid confusion between the
skcipher and AEAD attributes, rename the skcipher_walk chunksize
attribute to 'stride', and set it from the walksize (in the skcipher
case) or from the chunksize (in the AEAD case).

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ard Biesheuvel
2016-12-29 14:09:08 +00:00
committed by Herbert Xu
parent d79b5d0bbf
commit c821f6ab2e
3 changed files with 47 additions and 9 deletions
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2
include/crypto/internal/skcipher.h
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@@ -66,7 +66,7 @@ struct skcipher_walk {
int flags;
unsigned int blocksize;
unsigned int chunksize;
unsigned int stride;
unsigned int alignmask;
};