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>

diff --git a/arch/x86/crypto/Makefile b/arch/x86/crypto/Makefile
index b09e9a4cea3ef085ca7f76c7904dbd246cd2ae72..ce39b3c872b11a3552a84fa56c9a9856906a2efa 100644 (file)
--- a/arch/x86/crypto/Makefile
+++ b/arch/x86/crypto/Makefile
@@ -77,6 +77,7 @@ endif
 
 ifeq ($(avx2_supported),yes)
        camellia-aesni-avx2-y := camellia-aesni-avx2-asm_64.o camellia_aesni_avx2_glue.o
+       chacha20-x86_64-y += chacha20-avx2-x86_64.o
        serpent-avx2-y := serpent-avx2-asm_64.o serpent_avx2_glue.o
 endif
 

diff --git a/arch/x86/crypto/chacha20-avx2-x86_64.S b/arch/x86/crypto/chacha20-avx2-x86_64.S
new file mode 100644 (file)
index 0000000..16694e6
--- /dev/null
+++ b/arch/x86/crypto/chacha20-avx2-x86_64.S
@@ -0,0 +1,443 @@
+/*
+ * ChaCha20 256-bit cipher algorithm, RFC7539, x64 AVX2 functions
+ *
+ * Copyright (C) 2015 Martin Willi
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/linkage.h>
+
+.data
+.align 32
+
+ROT8:  .octa 0x0e0d0c0f0a09080b0605040702010003
+       .octa 0x0e0d0c0f0a09080b0605040702010003
+ROT16: .octa 0x0d0c0f0e09080b0a0504070601000302
+       .octa 0x0d0c0f0e09080b0a0504070601000302
+CTRINC:        .octa 0x00000003000000020000000100000000
+       .octa 0x00000007000000060000000500000004
+
+.text
+
+ENTRY(chacha20_8block_xor_avx2)
+       # %rdi: Input state matrix, s
+       # %rsi: 8 data blocks output, o
+       # %rdx: 8 data blocks input, i
+
+       # This function encrypts eight consecutive ChaCha20 blocks by loading
+       # the state matrix in AVX registers eight times. As we need some
+       # scratch registers, we save the first four registers on the stack. The
+       # algorithm performs each operation on the corresponding word of each
+       # state matrix, hence requires no word shuffling. For final XORing step
+       # we transpose the matrix by interleaving 32-, 64- and then 128-bit
+       # words, which allows us to do XOR in AVX registers. 8/16-bit word
+       # rotation is done with the slightly better performing byte shuffling,
+       # 7/12-bit word rotation uses traditional shift+OR.
+
+       vzeroupper
+       # 4 * 32 byte stack, 32-byte aligned
+       mov             %rsp, %r8
+       and             $~31, %rsp
+       sub             $0x80, %rsp
+
+       # x0..15[0-7] = s[0..15]
+       vpbroadcastd    0x00(%rdi),%ymm0
+       vpbroadcastd    0x04(%rdi),%ymm1
+       vpbroadcastd    0x08(%rdi),%ymm2
+       vpbroadcastd    0x0c(%rdi),%ymm3
+       vpbroadcastd    0x10(%rdi),%ymm4
+       vpbroadcastd    0x14(%rdi),%ymm5
+       vpbroadcastd    0x18(%rdi),%ymm6
+       vpbroadcastd    0x1c(%rdi),%ymm7
+       vpbroadcastd    0x20(%rdi),%ymm8
+       vpbroadcastd    0x24(%rdi),%ymm9
+       vpbroadcastd    0x28(%rdi),%ymm10
+       vpbroadcastd    0x2c(%rdi),%ymm11
+       vpbroadcastd    0x30(%rdi),%ymm12
+       vpbroadcastd    0x34(%rdi),%ymm13
+       vpbroadcastd    0x38(%rdi),%ymm14
+       vpbroadcastd    0x3c(%rdi),%ymm15
+       # x0..3 on stack
+       vmovdqa         %ymm0,0x00(%rsp)
+       vmovdqa         %ymm1,0x20(%rsp)
+       vmovdqa         %ymm2,0x40(%rsp)
+       vmovdqa         %ymm3,0x60(%rsp)
+
+       vmovdqa         CTRINC(%rip),%ymm1
+       vmovdqa         ROT8(%rip),%ymm2
+       vmovdqa         ROT16(%rip),%ymm3
+
+       # x12 += counter values 0-3
+       vpaddd          %ymm1,%ymm12,%ymm12
+
+       mov             $10,%ecx
+
+.Ldoubleround8:
+       # x0 += x4, x12 = rotl32(x12 ^ x0, 16)
+       vpaddd          0x00(%rsp),%ymm4,%ymm0
+       vmovdqa         %ymm0,0x00(%rsp)
+       vpxor           %ymm0,%ymm12,%ymm12
+       vpshufb         %ymm3,%ymm12,%ymm12
+       # x1 += x5, x13 = rotl32(x13 ^ x1, 16)
+       vpaddd          0x20(%rsp),%ymm5,%ymm0
+       vmovdqa         %ymm0,0x20(%rsp)
+       vpxor           %ymm0,%ymm13,%ymm13
+       vpshufb         %ymm3,%ymm13,%ymm13
+       # x2 += x6, x14 = rotl32(x14 ^ x2, 16)
+       vpaddd          0x40(%rsp),%ymm6,%ymm0
+       vmovdqa         %ymm0,0x40(%rsp)
+       vpxor           %ymm0,%ymm14,%ymm14
+       vpshufb         %ymm3,%ymm14,%ymm14
+       # x3 += x7, x15 = rotl32(x15 ^ x3, 16)
+       vpaddd          0x60(%rsp),%ymm7,%ymm0
+       vmovdqa         %ymm0,0x60(%rsp)
+       vpxor           %ymm0,%ymm15,%ymm15
+       vpshufb         %ymm3,%ymm15,%ymm15
+
+       # x8 += x12, x4 = rotl32(x4 ^ x8, 12)
+       vpaddd          %ymm12,%ymm8,%ymm8
+       vpxor           %ymm8,%ymm4,%ymm4
+       vpslld          $12,%ymm4,%ymm0
+       vpsrld          $20,%ymm4,%ymm4
+       vpor            %ymm0,%ymm4,%ymm4
+       # x9 += x13, x5 = rotl32(x5 ^ x9, 12)
+       vpaddd          %ymm13,%ymm9,%ymm9
+       vpxor           %ymm9,%ymm5,%ymm5
+       vpslld          $12,%ymm5,%ymm0
+       vpsrld          $20,%ymm5,%ymm5
+       vpor            %ymm0,%ymm5,%ymm5
+       # x10 += x14, x6 = rotl32(x6 ^ x10, 12)
+       vpaddd          %ymm14,%ymm10,%ymm10
+       vpxor           %ymm10,%ymm6,%ymm6
+       vpslld          $12,%ymm6,%ymm0
+       vpsrld          $20,%ymm6,%ymm6
+       vpor            %ymm0,%ymm6,%ymm6
+       # x11 += x15, x7 = rotl32(x7 ^ x11, 12)
+       vpaddd          %ymm15,%ymm11,%ymm11
+       vpxor           %ymm11,%ymm7,%ymm7
+       vpslld          $12,%ymm7,%ymm0
+       vpsrld          $20,%ymm7,%ymm7
+       vpor            %ymm0,%ymm7,%ymm7
+
+       # x0 += x4, x12 = rotl32(x12 ^ x0, 8)
+       vpaddd          0x00(%rsp),%ymm4,%ymm0
+       vmovdqa         %ymm0,0x00(%rsp)
+       vpxor           %ymm0,%ymm12,%ymm12
+       vpshufb         %ymm2,%ymm12,%ymm12
+       # x1 += x5, x13 = rotl32(x13 ^ x1, 8)
+       vpaddd          0x20(%rsp),%ymm5,%ymm0
+       vmovdqa         %ymm0,0x20(%rsp)
+       vpxor           %ymm0,%ymm13,%ymm13
+       vpshufb         %ymm2,%ymm13,%ymm13
+       # x2 += x6, x14 = rotl32(x14 ^ x2, 8)
+       vpaddd          0x40(%rsp),%ymm6,%ymm0
+       vmovdqa         %ymm0,0x40(%rsp)
+       vpxor           %ymm0,%ymm14,%ymm14
+       vpshufb         %ymm2,%ymm14,%ymm14
+       # x3 += x7, x15 = rotl32(x15 ^ x3, 8)
+       vpaddd          0x60(%rsp),%ymm7,%ymm0
+       vmovdqa         %ymm0,0x60(%rsp)
+       vpxor           %ymm0,%ymm15,%ymm15
+       vpshufb         %ymm2,%ymm15,%ymm15
+
+       # x8 += x12, x4 = rotl32(x4 ^ x8, 7)
+       vpaddd          %ymm12,%ymm8,%ymm8
+       vpxor           %ymm8,%ymm4,%ymm4
+       vpslld          $7,%ymm4,%ymm0
+       vpsrld          $25,%ymm4,%ymm4
+       vpor            %ymm0,%ymm4,%ymm4
+       # x9 += x13, x5 = rotl32(x5 ^ x9, 7)
+       vpaddd          %ymm13,%ymm9,%ymm9
+       vpxor           %ymm9,%ymm5,%ymm5
+       vpslld          $7,%ymm5,%ymm0
+       vpsrld          $25,%ymm5,%ymm5
+       vpor            %ymm0,%ymm5,%ymm5
+       # x10 += x14, x6 = rotl32(x6 ^ x10, 7)
+       vpaddd          %ymm14,%ymm10,%ymm10
+       vpxor           %ymm10,%ymm6,%ymm6
+       vpslld          $7,%ymm6,%ymm0
+       vpsrld          $25,%ymm6,%ymm6
+       vpor            %ymm0,%ymm6,%ymm6
+       # x11 += x15, x7 = rotl32(x7 ^ x11, 7)
+       vpaddd          %ymm15,%ymm11,%ymm11
+       vpxor           %ymm11,%ymm7,%ymm7
+       vpslld          $7,%ymm7,%ymm0
+       vpsrld          $25,%ymm7,%ymm7
+       vpor            %ymm0,%ymm7,%ymm7
+
+       # x0 += x5, x15 = rotl32(x15 ^ x0, 16)
+       vpaddd          0x00(%rsp),%ymm5,%ymm0
+       vmovdqa         %ymm0,0x00(%rsp)
+       vpxor           %ymm0,%ymm15,%ymm15
+       vpshufb         %ymm3,%ymm15,%ymm15
+       # x1 += x6, x12 = rotl32(x12 ^ x1, 16)%ymm0
+       vpaddd          0x20(%rsp),%ymm6,%ymm0
+       vmovdqa         %ymm0,0x20(%rsp)
+       vpxor           %ymm0,%ymm12,%ymm12
+       vpshufb         %ymm3,%ymm12,%ymm12
+       # x2 += x7, x13 = rotl32(x13 ^ x2, 16)
+       vpaddd          0x40(%rsp),%ymm7,%ymm0
+       vmovdqa         %ymm0,0x40(%rsp)
+       vpxor           %ymm0,%ymm13,%ymm13
+       vpshufb         %ymm3,%ymm13,%ymm13
+       # x3 += x4, x14 = rotl32(x14 ^ x3, 16)
+       vpaddd          0x60(%rsp),%ymm4,%ymm0
+       vmovdqa         %ymm0,0x60(%rsp)
+       vpxor           %ymm0,%ymm14,%ymm14
+       vpshufb         %ymm3,%ymm14,%ymm14
+
+       # x10 += x15, x5 = rotl32(x5 ^ x10, 12)
+       vpaddd          %ymm15,%ymm10,%ymm10
+       vpxor           %ymm10,%ymm5,%ymm5
+       vpslld          $12,%ymm5,%ymm0
+       vpsrld          $20,%ymm5,%ymm5
+       vpor            %ymm0,%ymm5,%ymm5
+       # x11 += x12, x6 = rotl32(x6 ^ x11, 12)
+       vpaddd          %ymm12,%ymm11,%ymm11
+       vpxor           %ymm11,%ymm6,%ymm6
+       vpslld          $12,%ymm6,%ymm0
+       vpsrld          $20,%ymm6,%ymm6
+       vpor            %ymm0,%ymm6,%ymm6
+       # x8 += x13, x7 = rotl32(x7 ^ x8, 12)
+       vpaddd          %ymm13,%ymm8,%ymm8
+       vpxor           %ymm8,%ymm7,%ymm7
+       vpslld          $12,%ymm7,%ymm0
+       vpsrld          $20,%ymm7,%ymm7
+       vpor            %ymm0,%ymm7,%ymm7
+       # x9 += x14, x4 = rotl32(x4 ^ x9, 12)
+       vpaddd          %ymm14,%ymm9,%ymm9
+       vpxor           %ymm9,%ymm4,%ymm4
+       vpslld          $12,%ymm4,%ymm0
+       vpsrld          $20,%ymm4,%ymm4
+       vpor            %ymm0,%ymm4,%ymm4
+
+       # x0 += x5, x15 = rotl32(x15 ^ x0, 8)
+       vpaddd          0x00(%rsp),%ymm5,%ymm0
+       vmovdqa         %ymm0,0x00(%rsp)
+       vpxor           %ymm0,%ymm15,%ymm15
+       vpshufb         %ymm2,%ymm15,%ymm15
+       # x1 += x6, x12 = rotl32(x12 ^ x1, 8)
+       vpaddd          0x20(%rsp),%ymm6,%ymm0
+       vmovdqa         %ymm0,0x20(%rsp)
+       vpxor           %ymm0,%ymm12,%ymm12
+       vpshufb         %ymm2,%ymm12,%ymm12
+       # x2 += x7, x13 = rotl32(x13 ^ x2, 8)
+       vpaddd          0x40(%rsp),%ymm7,%ymm0
+       vmovdqa         %ymm0,0x40(%rsp)
+       vpxor           %ymm0,%ymm13,%ymm13
+       vpshufb         %ymm2,%ymm13,%ymm13
+       # x3 += x4, x14 = rotl32(x14 ^ x3, 8)
+       vpaddd          0x60(%rsp),%ymm4,%ymm0
+       vmovdqa         %ymm0,0x60(%rsp)
+       vpxor           %ymm0,%ymm14,%ymm14
+       vpshufb         %ymm2,%ymm14,%ymm14
+
+       # x10 += x15, x5 = rotl32(x5 ^ x10, 7)
+       vpaddd          %ymm15,%ymm10,%ymm10
+       vpxor           %ymm10,%ymm5,%ymm5
+       vpslld          $7,%ymm5,%ymm0
+       vpsrld          $25,%ymm5,%ymm5
+       vpor            %ymm0,%ymm5,%ymm5
+       # x11 += x12, x6 = rotl32(x6 ^ x11, 7)
+       vpaddd          %ymm12,%ymm11,%ymm11
+       vpxor           %ymm11,%ymm6,%ymm6
+       vpslld          $7,%ymm6,%ymm0
+       vpsrld          $25,%ymm6,%ymm6
+       vpor            %ymm0,%ymm6,%ymm6
+       # x8 += x13, x7 = rotl32(x7 ^ x8, 7)
+       vpaddd          %ymm13,%ymm8,%ymm8
+       vpxor           %ymm8,%ymm7,%ymm7
+       vpslld          $7,%ymm7,%ymm0
+       vpsrld          $25,%ymm7,%ymm7
+       vpor            %ymm0,%ymm7,%ymm7
+       # x9 += x14, x4 = rotl32(x4 ^ x9, 7)
+       vpaddd          %ymm14,%ymm9,%ymm9
+       vpxor           %ymm9,%ymm4,%ymm4
+       vpslld          $7,%ymm4,%ymm0
+       vpsrld          $25,%ymm4,%ymm4
+       vpor            %ymm0,%ymm4,%ymm4
+
+       dec             %ecx
+       jnz             .Ldoubleround8
+
+       # x0..15[0-3] += s[0..15]
+       vpbroadcastd    0x00(%rdi),%ymm0
+       vpaddd          0x00(%rsp),%ymm0,%ymm0
+       vmovdqa         %ymm0,0x00(%rsp)
+       vpbroadcastd    0x04(%rdi),%ymm0
+       vpaddd          0x20(%rsp),%ymm0,%ymm0
+       vmovdqa         %ymm0,0x20(%rsp)
+       vpbroadcastd    0x08(%rdi),%ymm0
+       vpaddd          0x40(%rsp),%ymm0,%ymm0
+       vmovdqa         %ymm0,0x40(%rsp)
+       vpbroadcastd    0x0c(%rdi),%ymm0
+       vpaddd          0x60(%rsp),%ymm0,%ymm0
+       vmovdqa         %ymm0,0x60(%rsp)
+       vpbroadcastd    0x10(%rdi),%ymm0
+       vpaddd          %ymm0,%ymm4,%ymm4
+       vpbroadcastd    0x14(%rdi),%ymm0
+       vpaddd          %ymm0,%ymm5,%ymm5
+       vpbroadcastd    0x18(%rdi),%ymm0
+       vpaddd          %ymm0,%ymm6,%ymm6
+       vpbroadcastd    0x1c(%rdi),%ymm0
+       vpaddd          %ymm0,%ymm7,%ymm7
+       vpbroadcastd    0x20(%rdi),%ymm0
+       vpaddd          %ymm0,%ymm8,%ymm8
+       vpbroadcastd    0x24(%rdi),%ymm0
+       vpaddd          %ymm0,%ymm9,%ymm9
+       vpbroadcastd    0x28(%rdi),%ymm0
+       vpaddd          %ymm0,%ymm10,%ymm10
+       vpbroadcastd    0x2c(%rdi),%ymm0
+       vpaddd          %ymm0,%ymm11,%ymm11
+       vpbroadcastd    0x30(%rdi),%ymm0
+       vpaddd          %ymm0,%ymm12,%ymm12
+       vpbroadcastd    0x34(%rdi),%ymm0
+       vpaddd          %ymm0,%ymm13,%ymm13
+       vpbroadcastd    0x38(%rdi),%ymm0
+       vpaddd          %ymm0,%ymm14,%ymm14
+       vpbroadcastd    0x3c(%rdi),%ymm0
+       vpaddd          %ymm0,%ymm15,%ymm15
+
+       # x12 += counter values 0-3
+       vpaddd          %ymm1,%ymm12,%ymm12
+
+       # interleave 32-bit words in state n, n+1
+       vmovdqa         0x00(%rsp),%ymm0
+       vmovdqa         0x20(%rsp),%ymm1
+       vpunpckldq      %ymm1,%ymm0,%ymm2
+       vpunpckhdq      %ymm1,%ymm0,%ymm1
+       vmovdqa         %ymm2,0x00(%rsp)
+       vmovdqa         %ymm1,0x20(%rsp)
+       vmovdqa         0x40(%rsp),%ymm0
+       vmovdqa         0x60(%rsp),%ymm1
+       vpunpckldq      %ymm1,%ymm0,%ymm2
+       vpunpckhdq      %ymm1,%ymm0,%ymm1
+       vmovdqa         %ymm2,0x40(%rsp)
+       vmovdqa         %ymm1,0x60(%rsp)
+       vmovdqa         %ymm4,%ymm0
+       vpunpckldq      %ymm5,%ymm0,%ymm4
+       vpunpckhdq      %ymm5,%ymm0,%ymm5
+       vmovdqa         %ymm6,%ymm0
+       vpunpckldq      %ymm7,%ymm0,%ymm6
+       vpunpckhdq      %ymm7,%ymm0,%ymm7
+       vmovdqa         %ymm8,%ymm0
+       vpunpckldq      %ymm9,%ymm0,%ymm8
+       vpunpckhdq      %ymm9,%ymm0,%ymm9
+       vmovdqa         %ymm10,%ymm0
+       vpunpckldq      %ymm11,%ymm0,%ymm10
+       vpunpckhdq      %ymm11,%ymm0,%ymm11
+       vmovdqa         %ymm12,%ymm0
+       vpunpckldq      %ymm13,%ymm0,%ymm12
+       vpunpckhdq      %ymm13,%ymm0,%ymm13
+       vmovdqa         %ymm14,%ymm0
+       vpunpckldq      %ymm15,%ymm0,%ymm14
+       vpunpckhdq      %ymm15,%ymm0,%ymm15
+
+       # interleave 64-bit words in state n, n+2
+       vmovdqa         0x00(%rsp),%ymm0
+       vmovdqa         0x40(%rsp),%ymm2
+       vpunpcklqdq     %ymm2,%ymm0,%ymm1
+       vpunpckhqdq     %ymm2,%ymm0,%ymm2
+       vmovdqa         %ymm1,0x00(%rsp)
+       vmovdqa         %ymm2,0x40(%rsp)
+       vmovdqa         0x20(%rsp),%ymm0
+       vmovdqa         0x60(%rsp),%ymm2
+       vpunpcklqdq     %ymm2,%ymm0,%ymm1
+       vpunpckhqdq     %ymm2,%ymm0,%ymm2
+       vmovdqa         %ymm1,0x20(%rsp)
+       vmovdqa         %ymm2,0x60(%rsp)
+       vmovdqa         %ymm4,%ymm0
+       vpunpcklqdq     %ymm6,%ymm0,%ymm4
+       vpunpckhqdq     %ymm6,%ymm0,%ymm6
+       vmovdqa         %ymm5,%ymm0
+       vpunpcklqdq     %ymm7,%ymm0,%ymm5
+       vpunpckhqdq     %ymm7,%ymm0,%ymm7
+       vmovdqa         %ymm8,%ymm0
+       vpunpcklqdq     %ymm10,%ymm0,%ymm8
+       vpunpckhqdq     %ymm10,%ymm0,%ymm10
+       vmovdqa         %ymm9,%ymm0
+       vpunpcklqdq     %ymm11,%ymm0,%ymm9
+       vpunpckhqdq     %ymm11,%ymm0,%ymm11
+       vmovdqa         %ymm12,%ymm0
+       vpunpcklqdq     %ymm14,%ymm0,%ymm12
+       vpunpckhqdq     %ymm14,%ymm0,%ymm14
+       vmovdqa         %ymm13,%ymm0
+       vpunpcklqdq     %ymm15,%ymm0,%ymm13
+       vpunpckhqdq     %ymm15,%ymm0,%ymm15
+
+       # interleave 128-bit words in state n, n+4
+       vmovdqa         0x00(%rsp),%ymm0
+       vperm2i128      $0x20,%ymm4,%ymm0,%ymm1
+       vperm2i128      $0x31,%ymm4,%ymm0,%ymm4
+       vmovdqa         %ymm1,0x00(%rsp)
+       vmovdqa         0x20(%rsp),%ymm0
+       vperm2i128      $0x20,%ymm5,%ymm0,%ymm1
+       vperm2i128      $0x31,%ymm5,%ymm0,%ymm5
+       vmovdqa         %ymm1,0x20(%rsp)
+       vmovdqa         0x40(%rsp),%ymm0
+       vperm2i128      $0x20,%ymm6,%ymm0,%ymm1
+       vperm2i128      $0x31,%ymm6,%ymm0,%ymm6
+       vmovdqa         %ymm1,0x40(%rsp)
+       vmovdqa         0x60(%rsp),%ymm0
+       vperm2i128      $0x20,%ymm7,%ymm0,%ymm1
+       vperm2i128      $0x31,%ymm7,%ymm0,%ymm7
+       vmovdqa         %ymm1,0x60(%rsp)
+       vperm2i128      $0x20,%ymm12,%ymm8,%ymm0
+       vperm2i128      $0x31,%ymm12,%ymm8,%ymm12
+       vmovdqa         %ymm0,%ymm8
+       vperm2i128      $0x20,%ymm13,%ymm9,%ymm0
+       vperm2i128      $0x31,%ymm13,%ymm9,%ymm13
+       vmovdqa         %ymm0,%ymm9
+       vperm2i128      $0x20,%ymm14,%ymm10,%ymm0
+       vperm2i128      $0x31,%ymm14,%ymm10,%ymm14
+       vmovdqa         %ymm0,%ymm10
+       vperm2i128      $0x20,%ymm15,%ymm11,%ymm0
+       vperm2i128      $0x31,%ymm15,%ymm11,%ymm15
+       vmovdqa         %ymm0,%ymm11
+
+       # xor with corresponding input, write to output
+       vmovdqa         0x00(%rsp),%ymm0
+       vpxor           0x0000(%rdx),%ymm0,%ymm0
+       vmovdqu         %ymm0,0x0000(%rsi)
+       vmovdqa         0x20(%rsp),%ymm0
+       vpxor           0x0080(%rdx),%ymm0,%ymm0
+       vmovdqu         %ymm0,0x0080(%rsi)
+       vmovdqa         0x40(%rsp),%ymm0
+       vpxor           0x0040(%rdx),%ymm0,%ymm0
+       vmovdqu         %ymm0,0x0040(%rsi)
+       vmovdqa         0x60(%rsp),%ymm0
+       vpxor           0x00c0(%rdx),%ymm0,%ymm0
+       vmovdqu         %ymm0,0x00c0(%rsi)
+       vpxor           0x0100(%rdx),%ymm4,%ymm4
+       vmovdqu         %ymm4,0x0100(%rsi)
+       vpxor           0x0180(%rdx),%ymm5,%ymm5
+       vmovdqu         %ymm5,0x00180(%rsi)
+       vpxor           0x0140(%rdx),%ymm6,%ymm6
+       vmovdqu         %ymm6,0x0140(%rsi)
+       vpxor           0x01c0(%rdx),%ymm7,%ymm7
+       vmovdqu         %ymm7,0x01c0(%rsi)
+       vpxor           0x0020(%rdx),%ymm8,%ymm8
+       vmovdqu         %ymm8,0x0020(%rsi)
+       vpxor           0x00a0(%rdx),%ymm9,%ymm9
+       vmovdqu         %ymm9,0x00a0(%rsi)
+       vpxor           0x0060(%rdx),%ymm10,%ymm10
+       vmovdqu         %ymm10,0x0060(%rsi)
+       vpxor           0x00e0(%rdx),%ymm11,%ymm11
+       vmovdqu         %ymm11,0x00e0(%rsi)
+       vpxor           0x0120(%rdx),%ymm12,%ymm12
+       vmovdqu         %ymm12,0x0120(%rsi)
+       vpxor           0x01a0(%rdx),%ymm13,%ymm13
+       vmovdqu         %ymm13,0x01a0(%rsi)
+       vpxor           0x0160(%rdx),%ymm14,%ymm14
+       vmovdqu         %ymm14,0x0160(%rsi)
+       vpxor           0x01e0(%rdx),%ymm15,%ymm15
+       vmovdqu         %ymm15,0x01e0(%rsi)
+
+       vzeroupper
+       mov             %r8,%rsp
+       ret
+ENDPROC(chacha20_8block_xor_avx2)

diff --git a/arch/x86/crypto/chacha20_glue.c b/arch/x86/crypto/chacha20_glue.c
index 4d677c3eb7bd1610a6b3e902a6288d7ac23ca4f6..effe2160b7c535acc3468e7371744ab318c6a8c2 100644 (file)
--- 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);
 }
 

diff --git a/crypto/Kconfig b/crypto/Kconfig
index 8f24185ee0a7fe60d769ca7da73f1874c87e8c40..82caab0e82562bfb3f034d9505070e803c43b054 100644 (file)
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -1214,7 +1214,7 @@ config CRYPTO_CHACHA20
          <http://cr.yp.to/chacha/chacha-20080128.pdf>
 
 config CRYPTO_CHACHA20_X86_64
-       tristate "ChaCha20 cipher algorithm (x86_64/SSSE3)"
+       tristate "ChaCha20 cipher algorithm (x86_64/SSSE3/AVX2)"
        depends on X86 && 64BIT
        select CRYPTO_BLKCIPHER
        select CRYPTO_CHACHA20