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From: Ard Biesheuvel <ardb@kernel.org>
To: linux-crypto@vger.kernel.org
Cc: Ard Biesheuvel <ardb@kernel.org>,
	Herbert Xu <herbert@gondor.apana.org.au>,
	David Miller <davem@davemloft.net>,
	"Jason A . Donenfeld" <Jason@zx2c4.com>,
	Samuel Neves <sneves@dei.uc.pt>, Arnd Bergmann <arnd@arndb.de>,
	Eric Biggers <ebiggers@google.com>,
	Andy Lutomirski <luto@kernel.org>,
	Martin Willi <martin@strongswan.org>,
	Rene van Dorst <opensource@vdorst.com>,
	David Sterba <dsterba@suse.com>
Subject: [PATCH v5 06/34] crypto: arm64/chacha - expose arm64 ChaCha routine as library function
Date: Fri,  8 Nov 2019 13:22:12 +0100
Message-ID: <20191108122240.28479-7-ardb@kernel.org> (raw)
In-Reply-To: <20191108122240.28479-1-ardb@kernel.org>

Expose the accelerated NEON ChaCha routine directly as a symbol
export so that users of the ChaCha library API can use it directly.

Given that calls into the library API will always go through the
routines in this module if it is enabled, switch to static keys
to select the optimal implementation available (which may be none
at all, in which case we defer to the generic implementation for
all invocations).

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
 arch/arm64/crypto/Kconfig            |  1 +
 arch/arm64/crypto/chacha-neon-glue.c | 53 ++++++++++++++++----
 2 files changed, 43 insertions(+), 11 deletions(-)

diff --git a/arch/arm64/crypto/Kconfig b/arch/arm64/crypto/Kconfig
index 22c6642ae464..ffb827b84d6c 100644
--- a/arch/arm64/crypto/Kconfig
+++ b/arch/arm64/crypto/Kconfig
@@ -104,6 +104,7 @@ config CRYPTO_CHACHA20_NEON
 	depends on KERNEL_MODE_NEON
 	select CRYPTO_SKCIPHER
 	select CRYPTO_LIB_CHACHA_GENERIC
+	select CRYPTO_ARCH_HAVE_LIB_CHACHA
 
 config CRYPTO_NHPOLY1305_NEON
 	tristate "NHPoly1305 hash function using NEON instructions (for Adiantum)"
diff --git a/arch/arm64/crypto/chacha-neon-glue.c b/arch/arm64/crypto/chacha-neon-glue.c
index cae2cb92eca8..46cd4297761c 100644
--- a/arch/arm64/crypto/chacha-neon-glue.c
+++ b/arch/arm64/crypto/chacha-neon-glue.c
@@ -23,6 +23,7 @@
 #include <crypto/internal/chacha.h>
 #include <crypto/internal/simd.h>
 #include <crypto/internal/skcipher.h>
+#include <linux/jump_label.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 
@@ -36,6 +37,8 @@ asmlinkage void chacha_4block_xor_neon(u32 *state, u8 *dst, const u8 *src,
 				       int nrounds, int bytes);
 asmlinkage void hchacha_block_neon(const u32 *state, u32 *out, int nrounds);
 
+static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon);
+
 static void chacha_doneon(u32 *state, u8 *dst, const u8 *src,
 			  int bytes, int nrounds)
 {
@@ -59,6 +62,37 @@ static void chacha_doneon(u32 *state, u8 *dst, const u8 *src,
 	}
 }
 
+void hchacha_block_arch(const u32 *state, u32 *stream, int nrounds)
+{
+	if (!static_branch_likely(&have_neon) || !crypto_simd_usable()) {
+		hchacha_block_generic(state, stream, nrounds);
+	} else {
+		kernel_neon_begin();
+		hchacha_block_neon(state, stream, nrounds);
+		kernel_neon_end();
+	}
+}
+EXPORT_SYMBOL(hchacha_block_arch);
+
+void chacha_init_arch(u32 *state, const u32 *key, const u8 *iv)
+{
+	chacha_init_generic(state, key, iv);
+}
+EXPORT_SYMBOL(chacha_init_arch);
+
+void chacha_crypt_arch(u32 *state, u8 *dst, const u8 *src, unsigned int bytes,
+		       int nrounds)
+{
+	if (!static_branch_likely(&have_neon) || bytes <= CHACHA_BLOCK_SIZE ||
+	    !crypto_simd_usable())
+		return chacha_crypt_generic(state, dst, src, bytes, nrounds);
+
+	kernel_neon_begin();
+	chacha_doneon(state, dst, src, bytes, nrounds);
+	kernel_neon_end();
+}
+EXPORT_SYMBOL(chacha_crypt_arch);
+
 static int chacha_neon_stream_xor(struct skcipher_request *req,
 				  const struct chacha_ctx *ctx, const u8 *iv)
 {
@@ -76,7 +110,8 @@ static int chacha_neon_stream_xor(struct skcipher_request *req,
 		if (nbytes < walk.total)
 			nbytes = rounddown(nbytes, walk.stride);
 
-		if (!crypto_simd_usable()) {
+		if (!static_branch_likely(&have_neon) ||
+		    !crypto_simd_usable()) {
 			chacha_crypt_generic(state, walk.dst.virt.addr,
 					     walk.src.virt.addr, nbytes,
 					     ctx->nrounds);
@@ -109,14 +144,7 @@ static int xchacha_neon(struct skcipher_request *req)
 	u8 real_iv[16];
 
 	chacha_init_generic(state, ctx->key, req->iv);
-
-	if (crypto_simd_usable()) {
-		kernel_neon_begin();
-		hchacha_block_neon(state, subctx.key, ctx->nrounds);
-		kernel_neon_end();
-	} else {
-		hchacha_block_generic(state, subctx.key, ctx->nrounds);
-	}
+	hchacha_block_arch(state, subctx.key, ctx->nrounds);
 	subctx.nrounds = ctx->nrounds;
 
 	memcpy(&real_iv[0], req->iv + 24, 8);
@@ -179,14 +207,17 @@ static struct skcipher_alg algs[] = {
 static int __init chacha_simd_mod_init(void)
 {
 	if (!cpu_have_named_feature(ASIMD))
-		return -ENODEV;
+		return 0;
+
+	static_branch_enable(&have_neon);
 
 	return crypto_register_skciphers(algs, ARRAY_SIZE(algs));
 }
 
 static void __exit chacha_simd_mod_fini(void)
 {
-	crypto_unregister_skciphers(algs, ARRAY_SIZE(algs));
+	if (cpu_have_named_feature(ASIMD))
+		crypto_unregister_skciphers(algs, ARRAY_SIZE(algs));
 }
 
 module_init(chacha_simd_mod_init);
-- 
2.20.1


  parent reply index

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-08 12:22 [PATCH v5 00/34] crypto: crypto API library interfaces for WireGuard Ard Biesheuvel
2019-11-08 12:22 ` [PATCH v5 01/34] crypto: tidy up lib/crypto Kconfig and Makefile Ard Biesheuvel
2019-11-08 12:22 ` [PATCH v5 02/34] crypto: chacha - move existing library code into lib/crypto Ard Biesheuvel
2019-11-08 12:22 ` [PATCH v5 03/34] crypto: x86/chacha - depend on generic chacha library instead of crypto driver Ard Biesheuvel
2019-11-08 12:22 ` [PATCH v5 04/34] crypto: x86/chacha - expose SIMD ChaCha routine as library function Ard Biesheuvel
2019-11-08 12:22 ` [PATCH v5 05/34] crypto: arm64/chacha - depend on generic chacha library instead of crypto driver Ard Biesheuvel
2019-11-08 12:22 ` Ard Biesheuvel [this message]
2019-11-08 12:22 ` [PATCH v5 07/34] crypto: arm/chacha - import Eric Biggers's scalar accelerated ChaCha code Ard Biesheuvel
2019-11-08 12:22 ` [PATCH v5 08/34] crypto: arm/chacha - remove dependency on generic ChaCha driver Ard Biesheuvel
2019-11-08 12:22 ` [PATCH v5 09/34] crypto: arm/chacha - expose ARM ChaCha routine as library function Ard Biesheuvel
2019-11-08 12:22 ` [PATCH v5 10/34] crypto: mips/chacha - import 32r2 ChaCha code from Zinc Ard Biesheuvel
2019-11-08 12:22 ` [PATCH v5 11/34] crypto: mips/chacha - wire up accelerated 32r2 " Ard Biesheuvel
2019-11-08 12:22 ` [PATCH v5 12/34] crypto: chacha - unexport chacha_generic routines Ard Biesheuvel
2019-11-08 12:22 ` [PATCH v5 13/34] crypto: poly1305 - move core routines into a separate library Ard Biesheuvel
2019-11-08 12:22 ` [PATCH v5 14/34] crypto: x86/poly1305 - unify Poly1305 state struct with generic code Ard Biesheuvel
2019-11-08 12:22 ` [PATCH v5 15/34] crypto: poly1305 - expose init/update/final library interface Ard Biesheuvel
2019-11-08 12:22 ` [PATCH v5 16/34] crypto: x86/poly1305 - depend on generic library not generic shash Ard Biesheuvel
2019-11-08 12:22 ` [PATCH v5 17/34] crypto: x86/poly1305 - expose existing driver as poly1305 library Ard Biesheuvel
2019-11-08 12:22 ` [PATCH v5 18/34] crypto: arm64/poly1305 - incorporate OpenSSL/CRYPTOGAMS NEON implementation Ard Biesheuvel
2019-11-08 12:22 ` [PATCH v5 19/34] crypto: arm/poly1305 " Ard Biesheuvel
2019-11-08 12:22 ` [PATCH v5 20/34] crypto: mips/poly1305 - incorporate OpenSSL/CRYPTOGAMS optimized implementation Ard Biesheuvel
2019-11-08 12:22 ` [PATCH v5 21/34] int128: move __uint128_t compiler test to Kconfig Ard Biesheuvel
2019-11-08 12:22 ` [PATCH v5 22/34] crypto: BLAKE2s - generic C library implementation and selftest Ard Biesheuvel
2019-11-08 12:22 ` [PATCH v5 23/34] crypto: testmgr - add test cases for Blake2s Ard Biesheuvel
2019-11-08 12:22 ` [PATCH v5 24/34] crypto: blake2s - implement generic shash driver Ard Biesheuvel
2019-11-08 12:22 ` [PATCH v5 25/34] crypto: BLAKE2s - x86_64 SIMD implementation Ard Biesheuvel
2019-11-08 12:22 ` [PATCH v5 26/34] crypto: Curve25519 - generic C library implementations Ard Biesheuvel
2019-11-08 12:22 ` [PATCH v5 27/34] crypto: curve25519 - add kpp selftest Ard Biesheuvel
2019-11-08 12:22 ` [PATCH v5 28/34] crypto: curve25519 - implement generic KPP driver Ard Biesheuvel
2019-11-08 12:22 ` [PATCH v5 29/34] crypto: lib/curve25519 - work around Clang stack spilling issue Ard Biesheuvel
2019-11-08 12:22 ` [PATCH v5 30/34] crypto: Curve25519 - x86_64 library and KPP implementations Ard Biesheuvel
2019-11-08 12:22 ` [PATCH v5 31/34] crypto: arm - import Bernstein and Schwabe's Curve25519 ARM implementation Ard Biesheuvel
2019-11-08 12:22 ` [PATCH v5 32/34] crypto: arm/Curve25519 - wire up NEON implementation Ard Biesheuvel
2019-11-08 12:22 ` [PATCH v5 33/34] crypto: chacha20poly1305 - import construction and selftest from Zinc Ard Biesheuvel
2019-11-08 12:22 ` [PATCH v5 34/34] crypto: lib/chacha20poly1305 - reimplement crypt_from_sg() routine Ard Biesheuvel
2019-11-15  6:07 ` [PATCH v5 00/34] crypto: crypto API library interfaces for WireGuard Herbert Xu
     [not found]   ` <CAHmME9oOfhv6RN00m1c6c5qELC5dzFKS=mgDBQ-stVEWu00p_A@mail.gmail.com>
2019-11-15  9:09     ` Herbert Xu
2019-11-19 15:18       ` Jason A. Donenfeld
2019-11-19 15:34         ` Ard Biesheuvel
2019-11-19 15:44           ` Jason A. Donenfeld
2019-11-19 15:59             ` Ard Biesheuvel
2019-11-19 16:23             ` Eric Biggers
2019-11-19 21:43               ` Jordan Glover

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