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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 03/34] crypto: x86/chacha - depend on generic chacha library instead of crypto driver
Date: Fri,  8 Nov 2019 13:22:09 +0100
Message-ID: <20191108122240.28479-4-ardb@kernel.org> (raw)
In-Reply-To: <20191108122240.28479-1-ardb@kernel.org>

In preparation of extending the x86 ChaCha driver to also expose the ChaCha
library interface, drop the dependency on the chacha_generic crypto driver
as a non-SIMD fallback, and depend on the generic ChaCha library directly.
This way, we only pull in the code we actually need, without registering
a set of ChaCha skciphers that we will never use.

Since turning the FPU on and off is cheap these days, simplify the SIMD
routine by dropping the per-page yield, which makes for a cleaner switch
to the library API as well. This also allows use to invoke the skcipher
walk routines in non-atomic mode.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
 arch/x86/crypto/chacha_glue.c | 90 ++++++++------------
 crypto/Kconfig                |  2 +-
 2 files changed, 36 insertions(+), 56 deletions(-)

diff --git a/arch/x86/crypto/chacha_glue.c b/arch/x86/crypto/chacha_glue.c
index bc62daa8dafd..0aabb382edce 100644
--- a/arch/x86/crypto/chacha_glue.c
+++ b/arch/x86/crypto/chacha_glue.c
@@ -123,37 +123,38 @@ static void chacha_dosimd(u32 *state, u8 *dst, const u8 *src,
 	}
 }
 
-static int chacha_simd_stream_xor(struct skcipher_walk *walk,
+static int chacha_simd_stream_xor(struct skcipher_request *req,
 				  const struct chacha_ctx *ctx, const u8 *iv)
 {
 	u32 *state, state_buf[16 + 2] __aligned(8);
-	int next_yield = 4096; /* bytes until next FPU yield */
-	int err = 0;
+	struct skcipher_walk walk;
+	int err;
+
+	err = skcipher_walk_virt(&walk, req, false);
 
 	BUILD_BUG_ON(CHACHA_STATE_ALIGN != 16);
 	state = PTR_ALIGN(state_buf + 0, CHACHA_STATE_ALIGN);
 
-	crypto_chacha_init(state, ctx, iv);
+	chacha_init_generic(state, ctx->key, iv);
 
-	while (walk->nbytes > 0) {
-		unsigned int nbytes = walk->nbytes;
+	while (walk.nbytes > 0) {
+		unsigned int nbytes = walk.nbytes;
 
-		if (nbytes < walk->total) {
-			nbytes = round_down(nbytes, walk->stride);
-			next_yield -= nbytes;
-		}
+		if (nbytes < walk.total)
+			nbytes = round_down(nbytes, walk.stride);
 
-		chacha_dosimd(state, walk->dst.virt.addr, walk->src.virt.addr,
-			      nbytes, ctx->nrounds);
-
-		if (next_yield <= 0) {
-			/* temporarily allow preemption */
-			kernel_fpu_end();
+		if (!crypto_simd_usable()) {
+			chacha_crypt_generic(state, walk.dst.virt.addr,
+					     walk.src.virt.addr, nbytes,
+					     ctx->nrounds);
+		} else {
 			kernel_fpu_begin();
-			next_yield = 4096;
+			chacha_dosimd(state, walk.dst.virt.addr,
+				      walk.src.virt.addr, nbytes,
+				      ctx->nrounds);
+			kernel_fpu_end();
 		}
-
-		err = skcipher_walk_done(walk, walk->nbytes - nbytes);
+		err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
 	}
 
 	return err;
@@ -163,55 +164,34 @@ static int chacha_simd(struct skcipher_request *req)
 {
 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 	struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);
-	struct skcipher_walk walk;
-	int err;
 
-	if (req->cryptlen <= CHACHA_BLOCK_SIZE || !crypto_simd_usable())
-		return crypto_chacha_crypt(req);
-
-	err = skcipher_walk_virt(&walk, req, true);
-	if (err)
-		return err;
-
-	kernel_fpu_begin();
-	err = chacha_simd_stream_xor(&walk, ctx, req->iv);
-	kernel_fpu_end();
-	return err;
+	return chacha_simd_stream_xor(req, ctx, req->iv);
 }
 
 static int xchacha_simd(struct skcipher_request *req)
 {
 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 	struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);
-	struct skcipher_walk walk;
-	struct chacha_ctx subctx;
 	u32 *state, state_buf[16 + 2] __aligned(8);
+	struct chacha_ctx subctx;
 	u8 real_iv[16];
-	int err;
-
-	if (req->cryptlen <= CHACHA_BLOCK_SIZE || !crypto_simd_usable())
-		return crypto_xchacha_crypt(req);
-
-	err = skcipher_walk_virt(&walk, req, true);
-	if (err)
-		return err;
 
 	BUILD_BUG_ON(CHACHA_STATE_ALIGN != 16);
 	state = PTR_ALIGN(state_buf + 0, CHACHA_STATE_ALIGN);
-	crypto_chacha_init(state, ctx, req->iv);
-
-	kernel_fpu_begin();
-
-	hchacha_block_ssse3(state, subctx.key, ctx->nrounds);
+	chacha_init_generic(state, ctx->key, req->iv);
+
+	if (req->cryptlen > CHACHA_BLOCK_SIZE && crypto_simd_usable()) {
+		kernel_fpu_begin();
+		hchacha_block_ssse3(state, subctx.key, ctx->nrounds);
+		kernel_fpu_end();
+	} else {
+		hchacha_block_generic(state, subctx.key, ctx->nrounds);
+	}
 	subctx.nrounds = ctx->nrounds;
 
 	memcpy(&real_iv[0], req->iv + 24, 8);
 	memcpy(&real_iv[8], req->iv + 16, 8);
-	err = chacha_simd_stream_xor(&walk, &subctx, real_iv);
-
-	kernel_fpu_end();
-
-	return err;
+	return chacha_simd_stream_xor(req, &subctx, real_iv);
 }
 
 static struct skcipher_alg algs[] = {
@@ -227,7 +207,7 @@ static struct skcipher_alg algs[] = {
 		.max_keysize		= CHACHA_KEY_SIZE,
 		.ivsize			= CHACHA_IV_SIZE,
 		.chunksize		= CHACHA_BLOCK_SIZE,
-		.setkey			= crypto_chacha20_setkey,
+		.setkey			= chacha20_setkey,
 		.encrypt		= chacha_simd,
 		.decrypt		= chacha_simd,
 	}, {
@@ -242,7 +222,7 @@ static struct skcipher_alg algs[] = {
 		.max_keysize		= CHACHA_KEY_SIZE,
 		.ivsize			= XCHACHA_IV_SIZE,
 		.chunksize		= CHACHA_BLOCK_SIZE,
-		.setkey			= crypto_chacha20_setkey,
+		.setkey			= chacha20_setkey,
 		.encrypt		= xchacha_simd,
 		.decrypt		= xchacha_simd,
 	}, {
@@ -257,7 +237,7 @@ static struct skcipher_alg algs[] = {
 		.max_keysize		= CHACHA_KEY_SIZE,
 		.ivsize			= XCHACHA_IV_SIZE,
 		.chunksize		= CHACHA_BLOCK_SIZE,
-		.setkey			= crypto_chacha12_setkey,
+		.setkey			= chacha12_setkey,
 		.encrypt		= xchacha_simd,
 		.decrypt		= xchacha_simd,
 	},
diff --git a/crypto/Kconfig b/crypto/Kconfig
index ae4495ae003f..1abca30ed6ae 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -1436,7 +1436,7 @@ config CRYPTO_CHACHA20_X86_64
 	tristate "ChaCha stream cipher algorithms (x86_64/SSSE3/AVX2/AVX-512VL)"
 	depends on X86 && 64BIT
 	select CRYPTO_SKCIPHER
-	select CRYPTO_CHACHA20
+	select CRYPTO_LIB_CHACHA_GENERIC
 	help
 	  SSSE3, AVX2, and AVX-512VL optimized implementations of the ChaCha20,
 	  XChaCha20, and XChaCha12 stream ciphers.
-- 
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 ` Ard Biesheuvel [this message]
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 ` [PATCH v5 06/34] crypto: arm64/chacha - expose arm64 ChaCha routine as library function Ard Biesheuvel
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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