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| author | Martin Willi <martin@strongswan.org> | 2015-07-16 20:14:03 +0300 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2015-07-17 16:20:25 +0300 |
| commit | 3d1e93cdf16cfe6f315167c65dc504e467e4681a (patch) | |
| tree | 500aae710ce50604b90858b4204e6fb54bfbe541 /arch/x86/crypto/chacha20_glue.c | |
| parent | 274f938e0a01286f465d84d5a3f1565225f4ec4b (diff) | |
| download | linux-3d1e93cdf16cfe6f315167c65dc504e467e4681a.tar.xz | |
crypto: chacha20 - Add an eight block AVX2 variant for x86_64
Extends the x86_64 ChaCha20 implementation by a function processing eight
ChaCha20 blocks in parallel using AVX2.
For large messages, throughput increases by ~55-70% compared to four block
SSSE3:
testing speed of chacha20 (chacha20-simd) encryption
test 0 (256 bit key, 16 byte blocks): 42249230 operations in 10 seconds (675987680 bytes)
test 1 (256 bit key, 64 byte blocks): 46441641 operations in 10 seconds (2972265024 bytes)
test 2 (256 bit key, 256 byte blocks): 33028112 operations in 10 seconds (8455196672 bytes)
test 3 (256 bit key, 1024 byte blocks): 11568759 operations in 10 seconds (11846409216 bytes)
test 4 (256 bit key, 8192 byte blocks): 1448761 operations in 10 seconds (11868250112 bytes)
testing speed of chacha20 (chacha20-simd) encryption
test 0 (256 bit key, 16 byte blocks): 41999675 operations in 10 seconds (671994800 bytes)
test 1 (256 bit key, 64 byte blocks): 45805908 operations in 10 seconds (2931578112 bytes)
test 2 (256 bit key, 256 byte blocks): 32814947 operations in 10 seconds (8400626432 bytes)
test 3 (256 bit key, 1024 byte blocks): 19777167 operations in 10 seconds (20251819008 bytes)
test 4 (256 bit key, 8192 byte blocks): 2279321 operations in 10 seconds (18672197632 bytes)
Benchmark results from a Core i5-4670T.
Signed-off-by: Martin Willi <martin@strongswan.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'arch/x86/crypto/chacha20_glue.c')
| -rw-r--r-- | arch/x86/crypto/chacha20_glue.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/x86/crypto/chacha20_glue.c b/arch/x86/crypto/chacha20_glue.c index 4d677c3eb7bd..effe2160b7c5 100644 --- a/arch/x86/crypto/chacha20_glue.c +++ b/arch/x86/crypto/chacha20_glue.c @@ -21,12 +21,27 @@ asmlinkage void chacha20_block_xor_ssse3(u32 *state, u8 *dst, const u8 *src); asmlinkage void chacha20_4block_xor_ssse3(u32 *state, u8 *dst, const u8 *src); +#ifdef CONFIG_AS_AVX2 +asmlinkage void chacha20_8block_xor_avx2(u32 *state, u8 *dst, const u8 *src); +static bool chacha20_use_avx2; +#endif static void chacha20_dosimd(u32 *state, u8 *dst, const u8 *src, unsigned int bytes) { u8 buf[CHACHA20_BLOCK_SIZE]; +#ifdef CONFIG_AS_AVX2 + if (chacha20_use_avx2) { + while (bytes >= CHACHA20_BLOCK_SIZE * 8) { + chacha20_8block_xor_avx2(state, dst, src); + bytes -= CHACHA20_BLOCK_SIZE * 8; + src += CHACHA20_BLOCK_SIZE * 8; + dst += CHACHA20_BLOCK_SIZE * 8; + state[12] += 8; + } + } +#endif while (bytes >= CHACHA20_BLOCK_SIZE * 4) { chacha20_4block_xor_ssse3(state, dst, src); bytes -= CHACHA20_BLOCK_SIZE * 4; @@ -113,6 +128,10 @@ static int __init chacha20_simd_mod_init(void) if (!cpu_has_ssse3) return -ENODEV; +#ifdef CONFIG_AS_AVX2 + chacha20_use_avx2 = cpu_has_avx && cpu_has_avx2 && + cpu_has_xfeatures(XSTATE_SSE | XSTATE_YMM, NULL); +#endif return crypto_register_alg(&alg); } |