Commit da35b22d authored by Martin Willi's avatar Martin Willi Committed by Herbert Xu

crypto: poly1305 - Add a two block SSE2 variant for x86_64

Extends the x86_64 SSE2 Poly1305 authenticator by a function processing two
consecutive Poly1305 blocks in parallel using a derived key r^2. Loop
unrolling can be more effectively mapped to SSE instructions, further
increasing throughput.

For large messages, throughput increases by ~45-65% compared to single
block SSE2:

testing speed of poly1305 (poly1305-simd)
test  0 (   96 byte blocks,   16 bytes per update,   6 updates): 3790063 opers/sec,  363846076 bytes/sec
test  1 (   96 byte blocks,   32 bytes per update,   3 updates): 5913378 opers/sec,  567684355 bytes/sec
test  2 (   96 byte blocks,   96 bytes per update,   1 updates): 9352574 opers/sec,  897847104 bytes/sec
test  3 (  288 byte blocks,   16 bytes per update,  18 updates): 1362145 opers/sec,  392297990 bytes/sec
test  4 (  288 byte blocks,   32 bytes per update,   9 updates): 2007075 opers/sec,  578037628 bytes/sec
test  5 (  288 byte blocks,  288 bytes per update,   1 updates): 3709811 opers/sec, 1068425798 bytes/sec
test  6 ( 1056 byte blocks,   32 bytes per update,  33 updates):  566272 opers/sec,  597984182 bytes/sec
test  7 ( 1056 byte blocks, 1056 bytes per update,   1 updates): 1111657 opers/sec, 1173910108 bytes/sec
test  8 ( 2080 byte blocks,   32 bytes per update,  65 updates):  288857 opers/sec,  600823808 bytes/sec
test  9 ( 2080 byte blocks, 2080 bytes per update,   1 updates):  590746 opers/sec, 1228751888 bytes/sec
test 10 ( 4128 byte blocks, 4128 bytes per update,   1 updates):  301825 opers/sec, 1245936902 bytes/sec
test 11 ( 8224 byte blocks, 8224 bytes per update,   1 updates):  153075 opers/sec, 1258896201 bytes/sec

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

Benchmark results from a Core i5-4670T.
Signed-off-by: default avatarMartin Willi <martin@strongswan.org>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent c70f4abe
......@@ -15,6 +15,7 @@
.align 16
ANMASK: .octa 0x0000000003ffffff0000000003ffffff
ORMASK: .octa 0x00000000010000000000000001000000
.text
......@@ -274,3 +275,308 @@ ENTRY(poly1305_block_sse2)
pop %rbx
ret
ENDPROC(poly1305_block_sse2)
#define u0 0x00(%r8)
#define u1 0x04(%r8)
#define u2 0x08(%r8)
#define u3 0x0c(%r8)
#define u4 0x10(%r8)
#define hc0 %xmm0
#define hc1 %xmm1
#define hc2 %xmm2
#define hc3 %xmm5
#define hc4 %xmm6
#define ru0 %xmm7
#define ru1 %xmm8
#define ru2 %xmm9
#define ru3 %xmm10
#define ru4 %xmm11
#define sv1 %xmm12
#define sv2 %xmm13
#define sv3 %xmm14
#define sv4 %xmm15
#undef d0
#define d0 %r13
ENTRY(poly1305_2block_sse2)
# %rdi: Accumulator h[5]
# %rsi: 16 byte input block m
# %rdx: Poly1305 key r[5]
# %rcx: Doubleblock count
# %r8: Poly1305 derived key r^2 u[5]
# This two-block variant further improves performance by using loop
# unrolled block processing. This is more straight forward and does
# less byte shuffling, but requires a second Poly1305 key r^2:
# h = (h + m) * r => h = (h + m1) * r^2 + m2 * r
push %rbx
push %r12
push %r13
# combine r0,u0
movd u0,ru0
movd r0,t1
punpcklqdq t1,ru0
# combine r1,u1 and s1=r1*5,v1=u1*5
movd u1,ru1
movd r1,t1
punpcklqdq t1,ru1
movdqa ru1,sv1
pslld $2,sv1
paddd ru1,sv1
# combine r2,u2 and s2=r2*5,v2=u2*5
movd u2,ru2
movd r2,t1
punpcklqdq t1,ru2
movdqa ru2,sv2
pslld $2,sv2
paddd ru2,sv2
# combine r3,u3 and s3=r3*5,v3=u3*5
movd u3,ru3
movd r3,t1
punpcklqdq t1,ru3
movdqa ru3,sv3
pslld $2,sv3
paddd ru3,sv3
# combine r4,u4 and s4=r4*5,v4=u4*5
movd u4,ru4
movd r4,t1
punpcklqdq t1,ru4
movdqa ru4,sv4
pslld $2,sv4
paddd ru4,sv4
.Ldoblock2:
# hc0 = [ m[16-19] & 0x3ffffff, h0 + m[0-3] & 0x3ffffff ]
movd 0x00(m),hc0
movd 0x10(m),t1
punpcklqdq t1,hc0
pand ANMASK(%rip),hc0
movd h0,t1
paddd t1,hc0
# hc1 = [ (m[19-22] >> 2) & 0x3ffffff, h1 + (m[3-6] >> 2) & 0x3ffffff ]
movd 0x03(m),hc1
movd 0x13(m),t1
punpcklqdq t1,hc1
psrld $2,hc1
pand ANMASK(%rip),hc1
movd h1,t1
paddd t1,hc1
# hc2 = [ (m[22-25] >> 4) & 0x3ffffff, h2 + (m[6-9] >> 4) & 0x3ffffff ]
movd 0x06(m),hc2
movd 0x16(m),t1
punpcklqdq t1,hc2
psrld $4,hc2
pand ANMASK(%rip),hc2
movd h2,t1
paddd t1,hc2
# hc3 = [ (m[25-28] >> 6) & 0x3ffffff, h3 + (m[9-12] >> 6) & 0x3ffffff ]
movd 0x09(m),hc3
movd 0x19(m),t1
punpcklqdq t1,hc3
psrld $6,hc3
pand ANMASK(%rip),hc3
movd h3,t1
paddd t1,hc3
# hc4 = [ (m[28-31] >> 8) | (1<<24), h4 + (m[12-15] >> 8) | (1<<24) ]
movd 0x0c(m),hc4
movd 0x1c(m),t1
punpcklqdq t1,hc4
psrld $8,hc4
por ORMASK(%rip),hc4
movd h4,t1
paddd t1,hc4
# t1 = [ hc0[1] * r0, hc0[0] * u0 ]
movdqa ru0,t1
pmuludq hc0,t1
# t1 += [ hc1[1] * s4, hc1[0] * v4 ]
movdqa sv4,t2
pmuludq hc1,t2
paddq t2,t1
# t1 += [ hc2[1] * s3, hc2[0] * v3 ]
movdqa sv3,t2
pmuludq hc2,t2
paddq t2,t1
# t1 += [ hc3[1] * s2, hc3[0] * v2 ]
movdqa sv2,t2
pmuludq hc3,t2
paddq t2,t1
# t1 += [ hc4[1] * s1, hc4[0] * v1 ]
movdqa sv1,t2
pmuludq hc4,t2
paddq t2,t1
# d0 = t1[0] + t1[1]
movdqa t1,t2
psrldq $8,t2
paddq t2,t1
movq t1,d0
# t1 = [ hc0[1] * r1, hc0[0] * u1 ]
movdqa ru1,t1
pmuludq hc0,t1
# t1 += [ hc1[1] * r0, hc1[0] * u0 ]
movdqa ru0,t2
pmuludq hc1,t2
paddq t2,t1
# t1 += [ hc2[1] * s4, hc2[0] * v4 ]
movdqa sv4,t2
pmuludq hc2,t2
paddq t2,t1
# t1 += [ hc3[1] * s3, hc3[0] * v3 ]
movdqa sv3,t2
pmuludq hc3,t2
paddq t2,t1
# t1 += [ hc4[1] * s2, hc4[0] * v2 ]
movdqa sv2,t2
pmuludq hc4,t2
paddq t2,t1
# d1 = t1[0] + t1[1]
movdqa t1,t2
psrldq $8,t2
paddq t2,t1
movq t1,d1
# t1 = [ hc0[1] * r2, hc0[0] * u2 ]
movdqa ru2,t1
pmuludq hc0,t1
# t1 += [ hc1[1] * r1, hc1[0] * u1 ]
movdqa ru1,t2
pmuludq hc1,t2
paddq t2,t1
# t1 += [ hc2[1] * r0, hc2[0] * u0 ]
movdqa ru0,t2
pmuludq hc2,t2
paddq t2,t1
# t1 += [ hc3[1] * s4, hc3[0] * v4 ]
movdqa sv4,t2
pmuludq hc3,t2
paddq t2,t1
# t1 += [ hc4[1] * s3, hc4[0] * v3 ]
movdqa sv3,t2
pmuludq hc4,t2
paddq t2,t1
# d2 = t1[0] + t1[1]
movdqa t1,t2
psrldq $8,t2
paddq t2,t1
movq t1,d2
# t1 = [ hc0[1] * r3, hc0[0] * u3 ]
movdqa ru3,t1
pmuludq hc0,t1
# t1 += [ hc1[1] * r2, hc1[0] * u2 ]
movdqa ru2,t2
pmuludq hc1,t2
paddq t2,t1
# t1 += [ hc2[1] * r1, hc2[0] * u1 ]
movdqa ru1,t2
pmuludq hc2,t2
paddq t2,t1
# t1 += [ hc3[1] * r0, hc3[0] * u0 ]
movdqa ru0,t2
pmuludq hc3,t2
paddq t2,t1
# t1 += [ hc4[1] * s4, hc4[0] * v4 ]
movdqa sv4,t2
pmuludq hc4,t2
paddq t2,t1
# d3 = t1[0] + t1[1]
movdqa t1,t2
psrldq $8,t2
paddq t2,t1
movq t1,d3
# t1 = [ hc0[1] * r4, hc0[0] * u4 ]
movdqa ru4,t1
pmuludq hc0,t1
# t1 += [ hc1[1] * r3, hc1[0] * u3 ]
movdqa ru3,t2
pmuludq hc1,t2
paddq t2,t1
# t1 += [ hc2[1] * r2, hc2[0] * u2 ]
movdqa ru2,t2
pmuludq hc2,t2
paddq t2,t1
# t1 += [ hc3[1] * r1, hc3[0] * u1 ]
movdqa ru1,t2
pmuludq hc3,t2
paddq t2,t1
# t1 += [ hc4[1] * r0, hc4[0] * u0 ]
movdqa ru0,t2
pmuludq hc4,t2
paddq t2,t1
# d4 = t1[0] + t1[1]
movdqa t1,t2
psrldq $8,t2
paddq t2,t1
movq t1,d4
# d1 += d0 >> 26
mov d0,%rax
shr $26,%rax
add %rax,d1
# h0 = d0 & 0x3ffffff
mov d0,%rbx
and $0x3ffffff,%ebx
# d2 += d1 >> 26
mov d1,%rax
shr $26,%rax
add %rax,d2
# h1 = d1 & 0x3ffffff
mov d1,%rax
and $0x3ffffff,%eax
mov %eax,h1
# d3 += d2 >> 26
mov d2,%rax
shr $26,%rax
add %rax,d3
# h2 = d2 & 0x3ffffff
mov d2,%rax
and $0x3ffffff,%eax
mov %eax,h2
# d4 += d3 >> 26
mov d3,%rax
shr $26,%rax
add %rax,d4
# h3 = d3 & 0x3ffffff
mov d3,%rax
and $0x3ffffff,%eax
mov %eax,h3
# h0 += (d4 >> 26) * 5
mov d4,%rax
shr $26,%rax
lea (%eax,%eax,4),%eax
add %eax,%ebx
# h4 = d4 & 0x3ffffff
mov d4,%rax
and $0x3ffffff,%eax
mov %eax,h4
# h1 += h0 >> 26
mov %ebx,%eax
shr $26,%eax
add %eax,h1
# h0 = h0 & 0x3ffffff
andl $0x3ffffff,%ebx
mov %ebx,h0
add $0x20,m
dec %rcx
jnz .Ldoblock2
pop %r13
pop %r12
pop %rbx
ret
ENDPROC(poly1305_2block_sse2)
......@@ -18,24 +18,68 @@
#include <asm/fpu/api.h>
#include <asm/simd.h>
struct poly1305_simd_desc_ctx {
struct poly1305_desc_ctx base;
/* derived key u set? */
bool uset;
/* derived Poly1305 key r^2 */
u32 u[5];
};
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);
static int poly1305_simd_init(struct shash_desc *desc)
{
struct poly1305_simd_desc_ctx *sctx = shash_desc_ctx(desc);
sctx->uset = false;
return crypto_poly1305_init(desc);
}
static void poly1305_simd_mult(u32 *a, const u32 *b)
{
u8 m[POLY1305_BLOCK_SIZE];
memset(m, 0, sizeof(m));
/* The poly1305 block function adds a hi-bit to the accumulator which
* we don't need for key multiplication; compensate for it. */
a[4] -= 1 << 24;
poly1305_block_sse2(a, m, b, 1);
}
static unsigned int poly1305_simd_blocks(struct poly1305_desc_ctx *dctx,
const u8 *src, unsigned int srclen)
{
struct poly1305_simd_desc_ctx *sctx;
unsigned int blocks, datalen;
BUILD_BUG_ON(offsetof(struct poly1305_simd_desc_ctx, base));
sctx = container_of(dctx, struct poly1305_simd_desc_ctx, base);
if (unlikely(!dctx->sset)) {
datalen = crypto_poly1305_setdesckey(dctx, src, srclen);
src += srclen - datalen;
srclen = datalen;
}
if (likely(srclen >= POLY1305_BLOCK_SIZE * 2)) {
if (unlikely(!sctx->uset)) {
memcpy(sctx->u, dctx->r, sizeof(sctx->u));
poly1305_simd_mult(sctx->u, dctx->r);
sctx->uset = true;
}
blocks = srclen / (POLY1305_BLOCK_SIZE * 2);
poly1305_2block_sse2(dctx->h, src, dctx->r, blocks, sctx->u);
src += POLY1305_BLOCK_SIZE * 2 * blocks;
srclen -= POLY1305_BLOCK_SIZE * 2 * blocks;
}
if (srclen >= POLY1305_BLOCK_SIZE) {
blocks = srclen / POLY1305_BLOCK_SIZE;
poly1305_block_sse2(dctx->h, src, dctx->r, blocks);
srclen -= POLY1305_BLOCK_SIZE * blocks;
poly1305_block_sse2(dctx->h, src, dctx->r, 1);
srclen -= POLY1305_BLOCK_SIZE;
}
return srclen;
}
......@@ -84,11 +128,11 @@ static int poly1305_simd_update(struct shash_desc *desc,
static struct shash_alg alg = {
.digestsize = POLY1305_DIGEST_SIZE,
.init = crypto_poly1305_init,
.init = poly1305_simd_init,
.update = poly1305_simd_update,
.final = crypto_poly1305_final,
.setkey = crypto_poly1305_setkey,
.descsize = sizeof(struct poly1305_desc_ctx),
.descsize = sizeof(struct poly1305_simd_desc_ctx),
.base = {
.cra_name = "poly1305",
.cra_driver_name = "poly1305-simd",
......
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