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// SPDX-License-Identifier: GPL-2.0 OR MIT
/*
* Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
*/
#include <asm/cpu_device_id.h>
#include <asm/fpu/api.h>
#include <crypto/internal/poly1305.h>
#include <linux/jump_label.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sizes.h>
#include <linux/string.h>
#include <linux/unaligned.h>
struct poly1305_arch_internal {
union {
struct {
u32 h[5];
u32 is_base2_26;
};
u64 hs[3];
};
u64 r[2];
u64 pad;
struct { u32 r2, r1, r4, r3; } rn[9];
};
asmlinkage void poly1305_block_init_arch(
struct poly1305_block_state *state,
const u8 raw_key[POLY1305_BLOCK_SIZE]);
EXPORT_SYMBOL_GPL(poly1305_block_init_arch);
asmlinkage void poly1305_blocks_x86_64(struct poly1305_arch_internal *ctx,
const u8 *inp,
const size_t len, const u32 padbit);
asmlinkage void poly1305_emit_x86_64(const struct poly1305_state *ctx,
u8 mac[POLY1305_DIGEST_SIZE],
const u32 nonce[4]);
asmlinkage void poly1305_emit_avx(const struct poly1305_state *ctx,
u8 mac[POLY1305_DIGEST_SIZE],
const u32 nonce[4]);
asmlinkage void poly1305_blocks_avx(struct poly1305_arch_internal *ctx,
const u8 *inp, const size_t len,
const u32 padbit);
asmlinkage void poly1305_blocks_avx2(struct poly1305_arch_internal *ctx,
const u8 *inp, const size_t len,
const u32 padbit);
asmlinkage void poly1305_blocks_avx512(struct poly1305_arch_internal *ctx,
const u8 *inp,
const size_t len, const u32 padbit);
static __ro_after_init DEFINE_STATIC_KEY_FALSE(poly1305_use_avx);
static __ro_after_init DEFINE_STATIC_KEY_FALSE(poly1305_use_avx2);
static __ro_after_init DEFINE_STATIC_KEY_FALSE(poly1305_use_avx512);
void poly1305_blocks_arch(struct poly1305_block_state *state, const u8 *inp,
unsigned int len, u32 padbit)
{
struct poly1305_arch_internal *ctx =
container_of(&state->h.h, struct poly1305_arch_internal, h);
/* SIMD disables preemption, so relax after processing each page. */
BUILD_BUG_ON(SZ_4K < POLY1305_BLOCK_SIZE ||
SZ_4K % POLY1305_BLOCK_SIZE);
if (!static_branch_likely(&poly1305_use_avx)) {
poly1305_blocks_x86_64(ctx, inp, len, padbit);
return;
}
do {
const unsigned int bytes = min(len, SZ_4K);
kernel_fpu_begin();
if (static_branch_likely(&poly1305_use_avx512))
poly1305_blocks_avx512(ctx, inp, bytes, padbit);
else if (static_branch_likely(&poly1305_use_avx2))
poly1305_blocks_avx2(ctx, inp, bytes, padbit);
else
poly1305_blocks_avx(ctx, inp, bytes, padbit);
kernel_fpu_end();
len -= bytes;
inp += bytes;
} while (len);
}
EXPORT_SYMBOL_GPL(poly1305_blocks_arch);
void poly1305_emit_arch(const struct poly1305_state *ctx,
u8 mac[POLY1305_DIGEST_SIZE], const u32 nonce[4])
{
if (!static_branch_likely(&poly1305_use_avx))
poly1305_emit_x86_64(ctx, mac, nonce);
else
poly1305_emit_avx(ctx, mac, nonce);
}
EXPORT_SYMBOL_GPL(poly1305_emit_arch);
void poly1305_init_arch(struct poly1305_desc_ctx *dctx, const u8 key[POLY1305_KEY_SIZE])
{
dctx->s[0] = get_unaligned_le32(&key[16]);
dctx->s[1] = get_unaligned_le32(&key[20]);
dctx->s[2] = get_unaligned_le32(&key[24]);
dctx->s[3] = get_unaligned_le32(&key[28]);
dctx->buflen = 0;
poly1305_block_init_arch(&dctx->state, key);
}
EXPORT_SYMBOL(poly1305_init_arch);
void poly1305_update_arch(struct poly1305_desc_ctx *dctx, const u8 *src,
unsigned int srclen)
{
unsigned int bytes;
if (unlikely(dctx->buflen)) {
bytes = min(srclen, POLY1305_BLOCK_SIZE - dctx->buflen);
memcpy(dctx->buf + dctx->buflen, src, bytes);
src += bytes;
srclen -= bytes;
dctx->buflen += bytes;
if (dctx->buflen == POLY1305_BLOCK_SIZE) {
poly1305_blocks_arch(&dctx->state, dctx->buf,
POLY1305_BLOCK_SIZE, 1);
dctx->buflen = 0;
}
}
if (likely(srclen >= POLY1305_BLOCK_SIZE)) {
bytes = round_down(srclen, POLY1305_BLOCK_SIZE);
poly1305_blocks_arch(&dctx->state, src, bytes, 1);
src += bytes;
srclen -= bytes;
}
if (unlikely(srclen)) {
dctx->buflen = srclen;
memcpy(dctx->buf, src, srclen);
}
}
EXPORT_SYMBOL(poly1305_update_arch);
void poly1305_final_arch(struct poly1305_desc_ctx *dctx, u8 *dst)
{
if (unlikely(dctx->buflen)) {
dctx->buf[dctx->buflen++] = 1;
memset(dctx->buf + dctx->buflen, 0,
POLY1305_BLOCK_SIZE - dctx->buflen);
poly1305_blocks_arch(&dctx->state, dctx->buf,
POLY1305_BLOCK_SIZE, 0);
}
poly1305_emit_arch(&dctx->h, dst, dctx->s);
memzero_explicit(dctx, sizeof(*dctx));
}
EXPORT_SYMBOL(poly1305_final_arch);
bool poly1305_is_arch_optimized(void)
{
return static_key_enabled(&poly1305_use_avx);
}
EXPORT_SYMBOL(poly1305_is_arch_optimized);
static int __init poly1305_simd_mod_init(void)
{
if (boot_cpu_has(X86_FEATURE_AVX) &&
cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL))
static_branch_enable(&poly1305_use_avx);
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(&poly1305_use_avx2);
if (boot_cpu_has(X86_FEATURE_AVX) && boot_cpu_has(X86_FEATURE_AVX2) &&
boot_cpu_has(X86_FEATURE_AVX512F) &&
cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM | XFEATURE_MASK_AVX512, NULL) &&
/* Skylake downclocks unacceptably much when using zmm, but later generations are fast. */
boot_cpu_data.x86_vfm != INTEL_SKYLAKE_X)
static_branch_enable(&poly1305_use_avx512);
return 0;
}
arch_initcall(poly1305_simd_mod_init);
static void __exit poly1305_simd_mod_exit(void)
{
}
module_exit(poly1305_simd_mod_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jason A. Donenfeld <Jason@zx2c4.com>");
MODULE_DESCRIPTION("Poly1305 authenticator");
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