Contributors: 10
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Martin Willi |
674 |
61.38% |
13 |
36.11% |
| Eric Biggers |
218 |
19.85% |
10 |
27.78% |
| Ard Biesheuvel |
95 |
8.65% |
2 |
5.56% |
| Herbert Xu |
59 |
5.37% |
3 |
8.33% |
| Jason A. Donenfeld |
35 |
3.19% |
2 |
5.56% |
| Borislav Petkov |
8 |
0.73% |
2 |
5.56% |
| Tim Chen |
4 |
0.36% |
1 |
2.78% |
| Dave Hansen |
2 |
0.18% |
1 |
2.78% |
| Jerry Shih |
2 |
0.18% |
1 |
2.78% |
| Thomas Gleixner |
1 |
0.09% |
1 |
2.78% |
| Total |
1098 |
|
36 |
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* ChaCha and HChaCha functions (x86_64 optimized)
*
* Copyright (C) 2015 Martin Willi
*/
#include <asm/simd.h>
#include <crypto/chacha.h>
#include <linux/jump_label.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sizes.h>
asmlinkage void chacha_block_xor_ssse3(const struct chacha_state *state,
u8 *dst, const u8 *src,
unsigned int len, int nrounds);
asmlinkage void chacha_4block_xor_ssse3(const struct chacha_state *state,
u8 *dst, const u8 *src,
unsigned int len, int nrounds);
asmlinkage void hchacha_block_ssse3(const struct chacha_state *state,
u32 out[HCHACHA_OUT_WORDS], int nrounds);
asmlinkage void chacha_2block_xor_avx2(const struct chacha_state *state,
u8 *dst, const u8 *src,
unsigned int len, int nrounds);
asmlinkage void chacha_4block_xor_avx2(const struct chacha_state *state,
u8 *dst, const u8 *src,
unsigned int len, int nrounds);
asmlinkage void chacha_8block_xor_avx2(const struct chacha_state *state,
u8 *dst, const u8 *src,
unsigned int len, int nrounds);
asmlinkage void chacha_2block_xor_avx512vl(const struct chacha_state *state,
u8 *dst, const u8 *src,
unsigned int len, int nrounds);
asmlinkage void chacha_4block_xor_avx512vl(const struct chacha_state *state,
u8 *dst, const u8 *src,
unsigned int len, int nrounds);
asmlinkage void chacha_8block_xor_avx512vl(const struct chacha_state *state,
u8 *dst, const u8 *src,
unsigned int len, int nrounds);
static __ro_after_init DEFINE_STATIC_KEY_FALSE(chacha_use_simd);
static __ro_after_init DEFINE_STATIC_KEY_FALSE(chacha_use_avx2);
static __ro_after_init DEFINE_STATIC_KEY_FALSE(chacha_use_avx512vl);
static unsigned int chacha_advance(unsigned int len, unsigned int maxblocks)
{
len = min(len, maxblocks * CHACHA_BLOCK_SIZE);
return round_up(len, CHACHA_BLOCK_SIZE) / CHACHA_BLOCK_SIZE;
}
static void chacha_dosimd(struct chacha_state *state, u8 *dst, const u8 *src,
unsigned int bytes, int nrounds)
{
if (static_branch_likely(&chacha_use_avx512vl)) {
while (bytes >= CHACHA_BLOCK_SIZE * 8) {
chacha_8block_xor_avx512vl(state, dst, src, bytes,
nrounds);
bytes -= CHACHA_BLOCK_SIZE * 8;
src += CHACHA_BLOCK_SIZE * 8;
dst += CHACHA_BLOCK_SIZE * 8;
state->x[12] += 8;
}
if (bytes > CHACHA_BLOCK_SIZE * 4) {
chacha_8block_xor_avx512vl(state, dst, src, bytes,
nrounds);
state->x[12] += chacha_advance(bytes, 8);
return;
}
if (bytes > CHACHA_BLOCK_SIZE * 2) {
chacha_4block_xor_avx512vl(state, dst, src, bytes,
nrounds);
state->x[12] += chacha_advance(bytes, 4);
return;
}
if (bytes) {
chacha_2block_xor_avx512vl(state, dst, src, bytes,
nrounds);
state->x[12] += chacha_advance(bytes, 2);
return;
}
}
if (static_branch_likely(&chacha_use_avx2)) {
while (bytes >= CHACHA_BLOCK_SIZE * 8) {
chacha_8block_xor_avx2(state, dst, src, bytes, nrounds);
bytes -= CHACHA_BLOCK_SIZE * 8;
src += CHACHA_BLOCK_SIZE * 8;
dst += CHACHA_BLOCK_SIZE * 8;
state->x[12] += 8;
}
if (bytes > CHACHA_BLOCK_SIZE * 4) {
chacha_8block_xor_avx2(state, dst, src, bytes, nrounds);
state->x[12] += chacha_advance(bytes, 8);
return;
}
if (bytes > CHACHA_BLOCK_SIZE * 2) {
chacha_4block_xor_avx2(state, dst, src, bytes, nrounds);
state->x[12] += chacha_advance(bytes, 4);
return;
}
if (bytes > CHACHA_BLOCK_SIZE) {
chacha_2block_xor_avx2(state, dst, src, bytes, nrounds);
state->x[12] += chacha_advance(bytes, 2);
return;
}
}
while (bytes >= CHACHA_BLOCK_SIZE * 4) {
chacha_4block_xor_ssse3(state, dst, src, bytes, nrounds);
bytes -= CHACHA_BLOCK_SIZE * 4;
src += CHACHA_BLOCK_SIZE * 4;
dst += CHACHA_BLOCK_SIZE * 4;
state->x[12] += 4;
}
if (bytes > CHACHA_BLOCK_SIZE) {
chacha_4block_xor_ssse3(state, dst, src, bytes, nrounds);
state->x[12] += chacha_advance(bytes, 4);
return;
}
if (bytes) {
chacha_block_xor_ssse3(state, dst, src, bytes, nrounds);
state->x[12]++;
}
}
void hchacha_block_arch(const struct chacha_state *state,
u32 out[HCHACHA_OUT_WORDS], int nrounds)
{
if (!static_branch_likely(&chacha_use_simd)) {
hchacha_block_generic(state, out, nrounds);
} else {
kernel_fpu_begin();
hchacha_block_ssse3(state, out, nrounds);
kernel_fpu_end();
}
}
EXPORT_SYMBOL(hchacha_block_arch);
void chacha_crypt_arch(struct chacha_state *state, u8 *dst, const u8 *src,
unsigned int bytes, int nrounds)
{
if (!static_branch_likely(&chacha_use_simd) ||
bytes <= CHACHA_BLOCK_SIZE)
return chacha_crypt_generic(state, dst, src, bytes, nrounds);
do {
unsigned int todo = min_t(unsigned int, bytes, SZ_4K);
kernel_fpu_begin();
chacha_dosimd(state, dst, src, todo, nrounds);
kernel_fpu_end();
bytes -= todo;
src += todo;
dst += todo;
} while (bytes);
}
EXPORT_SYMBOL(chacha_crypt_arch);
bool chacha_is_arch_optimized(void)
{
return static_key_enabled(&chacha_use_simd);
}
EXPORT_SYMBOL(chacha_is_arch_optimized);
static int __init chacha_simd_mod_init(void)
{
if (!boot_cpu_has(X86_FEATURE_SSSE3))
return 0;
static_branch_enable(&chacha_use_simd);
if (boot_cpu_has(X86_FEATURE_AVX) &&
boot_cpu_has(X86_FEATURE_AVX2) &&
cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL)) {
static_branch_enable(&chacha_use_avx2);
if (boot_cpu_has(X86_FEATURE_AVX512VL) &&
boot_cpu_has(X86_FEATURE_AVX512BW)) /* kmovq */
static_branch_enable(&chacha_use_avx512vl);
}
return 0;
}
subsys_initcall(chacha_simd_mod_init);
static void __exit chacha_simd_mod_exit(void)
{
}
module_exit(chacha_simd_mod_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Martin Willi <martin@strongswan.org>");
MODULE_DESCRIPTION("ChaCha and HChaCha functions (x86_64 optimized)");