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crypto: poly1305 - Add a four block AVX2 variant for x86_64

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Extends the x86_64 Poly1305 authenticator by a function processing four
consecutive Poly1305 blocks in parallel using AVX2 instructions.

For large messages, throughput increases by ~15-45% compared to two
block SSE2:

testing speed of poly1305 (poly1305-simd)
test  0 (   96 byte blocks,   16 bytes per update,   6 updates): 3809514 opers/sec,  365713411 bytes/sec
test  1 (   96 byte blocks,   32 bytes per update,   3 updates): 5973423 opers/sec,  573448627 bytes/sec
test  2 (   96 byte blocks,   96 bytes per update,   1 updates): 9446779 opers/sec,  906890803 bytes/sec
test  3 (  288 byte blocks,   16 bytes per update,  18 updates): 1364814 opers/sec,  393066691 bytes/sec
test  4 (  288 byte blocks,   32 bytes per update,   9 updates): 2045780 opers/sec,  589184697 bytes/sec
test  5 (  288 byte blocks,  288 bytes per update,   1 updates): 3711946 opers/sec, 1069040592 bytes/sec
test  6 ( 1056 byte blocks,   32 bytes per update,  33 updates):  573686 opers/sec,  605812732 bytes/sec
test  7 ( 1056 byte blocks, 1056 bytes per update,   1 updates): 1647802 opers/sec, 1740079440 bytes/sec
test  8 ( 2080 byte blocks,   32 bytes per update,  65 updates):  292970 opers/sec,  609378224 bytes/sec
test  9 ( 2080 byte blocks, 2080 bytes per update,   1 updates):  943229 opers/sec, 1961916528 bytes/sec
test 10 ( 4128 byte blocks, 4128 bytes per update,   1 updates):  494623 opers/sec, 2041804569 bytes/sec
test 11 ( 8224 byte blocks, 8224 bytes per update,   1 updates):  254045 opers/sec, 2089271014 bytes/sec

testing speed of poly1305 (poly1305-simd)
test  0 (   96 byte blocks,   16 bytes per update,   6 updates): 3826224 opers/sec,  367317552 bytes/sec
test  1 (   96 byte blocks,   32 bytes per update,   3 updates): 5948638 opers/sec,  571069267 bytes/sec
test  2 (   96 byte blocks,   96 bytes per update,   1 updates): 9439110 opers/sec,  906154627 bytes/sec
test  3 (  288 byte blocks,   16 bytes per update,  18 updates): 1367756 opers/sec,  393913872 bytes/sec
test  4 (  288 byte blocks,   32 bytes per update,   9 updates): 2056881 opers/sec,  592381958 bytes/sec
test  5 (  288 byte blocks,  288 bytes per update,   1 updates): 3711153 opers/sec, 1068812179 bytes/sec
test  6 ( 1056 byte blocks,   32 bytes per update,  33 updates):  574940 opers/sec,  607136745 bytes/sec
test  7 ( 1056 byte blocks, 1056 bytes per update,   1 updates): 1948830 opers/sec, 2057964585 bytes/sec
test  8 ( 2080 byte blocks,   32 bytes per update,  65 updates):  293308 opers/sec,  610082096 bytes/sec
test  9 ( 2080 byte blocks, 2080 bytes per update,   1 updates): 1235224 opers/sec, 2569267792 bytes/sec
test 10 ( 4128 byte blocks, 4128 bytes per update,   1 updates):  684405 opers/sec, 2825226316 bytes/sec
test 11 ( 8224 byte blocks, 8224 bytes per update,   1 updates):  367101 opers/sec, 3019039446 bytes/sec

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>
This commit is contained in:
Martin Willi
2015-07-16 19:14:08 +02:00
committed by Herbert Xu
parent da35b22df3
commit b1ccc8f4b6
4 changed files with 428 additions and 1 deletions
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40
arch/x86/crypto/poly1305_glue.c
View File

@@ -22,20 +22,33 @@ struct poly1305_simd_desc_ctx {
struct poly1305_desc_ctx base;
/* derived key u set? */
bool uset;
#ifdef CONFIG_AS_AVX2
/* derived keys r^3, r^4 set? */
bool wset;
#endif
/* derived Poly1305 key r^2 */
u32 u[5];
/* ... silently appended r^3 and r^4 when using AVX2 */
};
asmlinkage void poly1305_block_sse2(u32 *h, const u8 *src,
const u32 *r, unsigned int blocks);
asmlinkage void poly1305_2block_sse2(u32 *h, const u8 *src, const u32 *r,
unsigned int blocks, const u32 *u);
#ifdef CONFIG_AS_AVX2
asmlinkage void poly1305_4block_avx2(u32 *h, const u8 *src, const u32 *r,
unsigned int blocks, const u32 *u);
static bool poly1305_use_avx2;
#endif
static int poly1305_simd_init(struct shash_desc *desc)
{
struct poly1305_simd_desc_ctx *sctx = shash_desc_ctx(desc);
sctx->uset = false;
#ifdef CONFIG_AS_AVX2
sctx->wset = false;
#endif
return crypto_poly1305_init(desc);
}
@@ -66,6 +79,26 @@ static unsigned int poly1305_simd_blocks(struct poly1305_desc_ctx *dctx,
srclen = datalen;
}
#ifdef CONFIG_AS_AVX2
if (poly1305_use_avx2 && srclen >= POLY1305_BLOCK_SIZE * 4) {
if (unlikely(!sctx->wset)) {
if (!sctx->uset) {
memcpy(sctx->u, dctx->r, sizeof(sctx->u));
poly1305_simd_mult(sctx->u, dctx->r);
sctx->uset = true;
}
memcpy(sctx->u + 5, sctx->u, sizeof(sctx->u));
poly1305_simd_mult(sctx->u + 5, dctx->r);
memcpy(sctx->u + 10, sctx->u + 5, sizeof(sctx->u));
poly1305_simd_mult(sctx->u + 10, dctx->r);
sctx->wset = true;
}
blocks = srclen / (POLY1305_BLOCK_SIZE * 4);
poly1305_4block_avx2(dctx->h, src, dctx->r, blocks, sctx->u);
src += POLY1305_BLOCK_SIZE * 4 * blocks;
srclen -= POLY1305_BLOCK_SIZE * 4 * blocks;
}
#endif
if (likely(srclen >= POLY1305_BLOCK_SIZE * 2)) {
if (unlikely(!sctx->uset)) {
memcpy(sctx->u, dctx->r, sizeof(sctx->u));
@@ -149,6 +182,13 @@ static int __init poly1305_simd_mod_init(void)
if (!cpu_has_xmm2)
return -ENODEV;
#ifdef CONFIG_AS_AVX2
poly1305_use_avx2 = cpu_has_avx && cpu_has_avx2 &&
cpu_has_xfeatures(XSTATE_SSE | XSTATE_YMM, NULL);
alg.descsize = sizeof(struct poly1305_simd_desc_ctx);
if (poly1305_use_avx2)
alg.descsize += 10 * sizeof(u32);
#endif
return crypto_register_shash(&alg);
}