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From 2ceb2e26de65cce974875e0487dde20bc5f1826c Mon Sep 17 00:00:00 2001
From: Ard Biesheuvel <ardb@kernel.org>
Date: Fri, 8 Nov 2019 13:22:23 +0100
Subject: [PATCH 017/124] crypto: x86/poly1305 - expose existing driver as
poly1305 library
commit f0e89bcfbb894e5844cd1bbf6b3cf7c63cb0f5ac upstream.
Implement the arch init/update/final Poly1305 library routines in the
accelerated SIMD driver for x86 so they are accessible to users of
the Poly1305 library interface as well.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
---
arch/x86/crypto/poly1305_glue.c | 57 ++++++++++++++++++++++++---------
crypto/Kconfig | 1 +
lib/crypto/Kconfig | 1 +
3 files changed, 43 insertions(+), 16 deletions(-)
--- a/arch/x86/crypto/poly1305_glue.c
+++ b/arch/x86/crypto/poly1305_glue.c
@@ -10,6 +10,7 @@
#include <crypto/internal/poly1305.h>
#include <crypto/internal/simd.h>
#include <linux/crypto.h>
+#include <linux/jump_label.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <asm/simd.h>
@@ -21,7 +22,8 @@ asmlinkage void poly1305_2block_sse2(u32
asmlinkage void poly1305_4block_avx2(u32 *h, const u8 *src, const u32 *r,
unsigned int blocks, const u32 *u);
-static bool poly1305_use_avx2 __ro_after_init;
+static __ro_after_init DEFINE_STATIC_KEY_FALSE(poly1305_use_simd);
+static __ro_after_init DEFINE_STATIC_KEY_FALSE(poly1305_use_avx2);
static void poly1305_simd_mult(u32 *a, const u32 *b)
{
@@ -64,7 +66,7 @@ static unsigned int poly1305_simd_blocks
}
if (IS_ENABLED(CONFIG_AS_AVX2) &&
- poly1305_use_avx2 &&
+ static_branch_likely(&poly1305_use_avx2) &&
srclen >= POLY1305_BLOCK_SIZE * 4) {
if (unlikely(dctx->rset < 4)) {
if (dctx->rset < 2) {
@@ -103,10 +105,15 @@ static unsigned int poly1305_simd_blocks
return srclen;
}
-static int poly1305_simd_update(struct shash_desc *desc,
- const u8 *src, unsigned int srclen)
+void poly1305_init_arch(struct poly1305_desc_ctx *desc, const u8 *key)
+{
+ poly1305_init_generic(desc, key);
+}
+EXPORT_SYMBOL(poly1305_init_arch);
+
+void poly1305_update_arch(struct poly1305_desc_ctx *dctx, const u8 *src,
+ unsigned int srclen)
{
- struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc);
unsigned int bytes;
if (unlikely(dctx->buflen)) {
@@ -117,7 +124,8 @@ static int poly1305_simd_update(struct s
dctx->buflen += bytes;
if (dctx->buflen == POLY1305_BLOCK_SIZE) {
- if (likely(crypto_simd_usable())) {
+ if (static_branch_likely(&poly1305_use_simd) &&
+ likely(crypto_simd_usable())) {
kernel_fpu_begin();
poly1305_simd_blocks(dctx, dctx->buf,
POLY1305_BLOCK_SIZE);
@@ -131,7 +139,8 @@ static int poly1305_simd_update(struct s
}
if (likely(srclen >= POLY1305_BLOCK_SIZE)) {
- if (likely(crypto_simd_usable())) {
+ if (static_branch_likely(&poly1305_use_simd) &&
+ likely(crypto_simd_usable())) {
kernel_fpu_begin();
bytes = poly1305_simd_blocks(dctx, src, srclen);
kernel_fpu_end();
@@ -147,6 +156,13 @@ static int poly1305_simd_update(struct s
memcpy(dctx->buf, src, srclen);
}
}
+EXPORT_SYMBOL(poly1305_update_arch);
+
+void poly1305_final_arch(struct poly1305_desc_ctx *desc, u8 *digest)
+{
+ poly1305_final_generic(desc, digest);
+}
+EXPORT_SYMBOL(poly1305_final_arch);
static int crypto_poly1305_init(struct shash_desc *desc)
{
@@ -171,6 +187,15 @@ static int crypto_poly1305_final(struct
return 0;
}
+static int poly1305_simd_update(struct shash_desc *desc,
+ const u8 *src, unsigned int srclen)
+{
+ struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc);
+
+ poly1305_update_arch(dctx, src, srclen);
+ return 0;
+}
+
static struct shash_alg alg = {
.digestsize = POLY1305_DIGEST_SIZE,
.init = crypto_poly1305_init,
@@ -189,15 +214,15 @@ static struct shash_alg alg = {
static int __init poly1305_simd_mod_init(void)
{
if (!boot_cpu_has(X86_FEATURE_XMM2))
- return -ENODEV;
+ return 0;
- poly1305_use_avx2 = IS_ENABLED(CONFIG_AS_AVX2) &&
- boot_cpu_has(X86_FEATURE_AVX) &&
- boot_cpu_has(X86_FEATURE_AVX2) &&
- cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL);
- alg.descsize = sizeof(struct poly1305_desc_ctx) + 5 * sizeof(u32);
- if (poly1305_use_avx2)
- alg.descsize += 10 * sizeof(u32);
+ static_branch_enable(&poly1305_use_simd);
+
+ if (IS_ENABLED(CONFIG_AS_AVX2) &&
+ 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);
return crypto_register_shash(&alg);
}
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -698,6 +698,7 @@ config CRYPTO_POLY1305_X86_64
tristate "Poly1305 authenticator algorithm (x86_64/SSE2/AVX2)"
depends on X86 && 64BIT
select CRYPTO_LIB_POLY1305_GENERIC
+ select CRYPTO_ARCH_HAVE_LIB_POLY1305
help
Poly1305 authenticator algorithm, RFC7539.
--- a/lib/crypto/Kconfig
+++ b/lib/crypto/Kconfig
@@ -39,6 +39,7 @@ config CRYPTO_LIB_DES
config CRYPTO_LIB_POLY1305_RSIZE
int
+ default 4 if X86_64
default 1
config CRYPTO_ARCH_HAVE_LIB_POLY1305
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