crypto: x86/serpent-avx2 - remove LRW algorithm

The LRW template now wraps an ECB mode algorithm rather than the block
cipher directly.  Therefore it is now redundant for crypto modules to
wrap their ECB code with generic LRW code themselves via lrw_crypt().

Remove the lrw-serpent-avx2 algorithm which did this.  Users who request
lrw(serpent) and previously would have gotten lrw-serpent-avx2 will now
get lrw(ecb-serpent-avx2) instead, which is just as fast.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

2 files changed, 1 insertions, 176 deletions

diff --git a/arch/x86/crypto/serpent_avx2_glue.c b/arch/x86/crypto/serpent_avx2_glue.c
index 870f6d812a2dd..2bd0f0459db43 100644
--- a/arch/x86/crypto/serpent_avx2_glue.c
+++ b/arch/x86/crypto/serpent_avx2_glue.c
@@ -168,122 +168,6 @@ static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 	return glue_ctr_crypt_128bit(&serpent_ctr, desc, dst, src, nbytes);
 }
 
-static inline bool serpent_fpu_begin(bool fpu_enabled, unsigned int nbytes)
-{
-	/* since reusing AVX functions, starts using FPU at 8 parallel blocks */
-	return glue_fpu_begin(SERPENT_BLOCK_SIZE, 8, NULL, fpu_enabled, nbytes);
-}
-
-static inline void serpent_fpu_end(bool fpu_enabled)
-{
-	glue_fpu_end(fpu_enabled);
-}
-
-struct crypt_priv {
-	struct serpent_ctx *ctx;
-	bool fpu_enabled;
-};
-
-static void encrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
-{
-	const unsigned int bsize = SERPENT_BLOCK_SIZE;
-	struct crypt_priv *ctx = priv;
-	int i;
-
-	ctx->fpu_enabled = serpent_fpu_begin(ctx->fpu_enabled, nbytes);
-
-	if (nbytes >= SERPENT_AVX2_PARALLEL_BLOCKS * bsize) {
-		serpent_ecb_enc_16way(ctx->ctx, srcdst, srcdst);
-		srcdst += bsize * SERPENT_AVX2_PARALLEL_BLOCKS;
-		nbytes -= bsize * SERPENT_AVX2_PARALLEL_BLOCKS;
-	}
-
-	while (nbytes >= SERPENT_PARALLEL_BLOCKS * bsize) {
-		serpent_ecb_enc_8way_avx(ctx->ctx, srcdst, srcdst);
-		srcdst += bsize * SERPENT_PARALLEL_BLOCKS;
-		nbytes -= bsize * SERPENT_PARALLEL_BLOCKS;
-	}
-
-	for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
-		__serpent_encrypt(ctx->ctx, srcdst, srcdst);
-}
-
-static void decrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
-{
-	const unsigned int bsize = SERPENT_BLOCK_SIZE;
-	struct crypt_priv *ctx = priv;
-	int i;
-
-	ctx->fpu_enabled = serpent_fpu_begin(ctx->fpu_enabled, nbytes);
-
-	if (nbytes >= SERPENT_AVX2_PARALLEL_BLOCKS * bsize) {
-		serpent_ecb_dec_16way(ctx->ctx, srcdst, srcdst);
-		srcdst += bsize * SERPENT_AVX2_PARALLEL_BLOCKS;
-		nbytes -= bsize * SERPENT_AVX2_PARALLEL_BLOCKS;
-	}
-
-	while (nbytes >= SERPENT_PARALLEL_BLOCKS * bsize) {
-		serpent_ecb_dec_8way_avx(ctx->ctx, srcdst, srcdst);
-		srcdst += bsize * SERPENT_PARALLEL_BLOCKS;
-		nbytes -= bsize * SERPENT_PARALLEL_BLOCKS;
-	}
-
-	for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
-		__serpent_decrypt(ctx->ctx, srcdst, srcdst);
-}
-
-static int lrw_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
-		       struct scatterlist *src, unsigned int nbytes)
-{
-	struct serpent_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
-	be128 buf[SERPENT_AVX2_PARALLEL_BLOCKS];
-	struct crypt_priv crypt_ctx = {
-		.ctx = &ctx->serpent_ctx,
-		.fpu_enabled = false,
-	};
-	struct lrw_crypt_req req = {
-		.tbuf = buf,
-		.tbuflen = sizeof(buf),
-
-		.table_ctx = &ctx->lrw_table,
-		.crypt_ctx = &crypt_ctx,
-		.crypt_fn = encrypt_callback,
-	};
-	int ret;
-
-	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
-	ret = lrw_crypt(desc, dst, src, nbytes, &req);
-	serpent_fpu_end(crypt_ctx.fpu_enabled);
-
-	return ret;
-}
-
-static int lrw_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
-		       struct scatterlist *src, unsigned int nbytes)
-{
-	struct serpent_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
-	be128 buf[SERPENT_AVX2_PARALLEL_BLOCKS];
-	struct crypt_priv crypt_ctx = {
-		.ctx = &ctx->serpent_ctx,
-		.fpu_enabled = false,
-	};
-	struct lrw_crypt_req req = {
-		.tbuf = buf,
-		.tbuflen = sizeof(buf),
-
-		.table_ctx = &ctx->lrw_table,
-		.crypt_ctx = &crypt_ctx,
-		.crypt_fn = decrypt_callback,
-	};
-	int ret;
-
-	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
-	ret = lrw_crypt(desc, dst, src, nbytes, &req);
-	serpent_fpu_end(crypt_ctx.fpu_enabled);
-
-	return ret;
-}
-
 static int xts_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 		       struct scatterlist *src, unsigned int nbytes)
 {
@@ -304,7 +188,7 @@ static int xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 				     &ctx->tweak_ctx, &ctx->crypt_ctx);
 }
 
-static struct crypto_alg srp_algs[10] = { {
+static struct crypto_alg srp_algs[] = { {
 	.cra_name		= "__ecb-serpent-avx2",
 	.cra_driver_name	= "__driver-ecb-serpent-avx2",
 	.cra_priority		= 0,
@@ -315,7 +199,6 @@ static struct crypto_alg srp_algs[10] = { {
 	.cra_alignmask		= 0,
 	.cra_type		= &crypto_blkcipher_type,
 	.cra_module		= THIS_MODULE,
-	.cra_list		= LIST_HEAD_INIT(srp_algs[0].cra_list),
 	.cra_u = {
 		.blkcipher = {
 			.min_keysize	= SERPENT_MIN_KEY_SIZE,
@@ -336,7 +219,6 @@ static struct crypto_alg srp_algs[10] = { {
 	.cra_alignmask		= 0,
 	.cra_type		= &crypto_blkcipher_type,
 	.cra_module		= THIS_MODULE,
-	.cra_list		= LIST_HEAD_INIT(srp_algs[1].cra_list),
 	.cra_u = {
 		.blkcipher = {
 			.min_keysize	= SERPENT_MIN_KEY_SIZE,
@@ -357,7 +239,6 @@ static struct crypto_alg srp_algs[10] = { {
 	.cra_alignmask		= 0,
 	.cra_type		= &crypto_blkcipher_type,
 	.cra_module		= THIS_MODULE,
-	.cra_list		= LIST_HEAD_INIT(srp_algs[2].cra_list),
 	.cra_u = {
 		.blkcipher = {
 			.min_keysize	= SERPENT_MIN_KEY_SIZE,
@@ -369,31 +250,6 @@ static struct crypto_alg srp_algs[10] = { {
 		},
 	},
 }, {
-	.cra_name		= "__lrw-serpent-avx2",
-	.cra_driver_name	= "__driver-lrw-serpent-avx2",
-	.cra_priority		= 0,
-	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER |
-				  CRYPTO_ALG_INTERNAL,
-	.cra_blocksize		= SERPENT_BLOCK_SIZE,
-	.cra_ctxsize		= sizeof(struct serpent_lrw_ctx),
-	.cra_alignmask		= 0,
-	.cra_type		= &crypto_blkcipher_type,
-	.cra_module		= THIS_MODULE,
-	.cra_list		= LIST_HEAD_INIT(srp_algs[3].cra_list),
-	.cra_exit		= lrw_serpent_exit_tfm,
-	.cra_u = {
-		.blkcipher = {
-			.min_keysize	= SERPENT_MIN_KEY_SIZE +
-					  SERPENT_BLOCK_SIZE,
-			.max_keysize	= SERPENT_MAX_KEY_SIZE +
-					  SERPENT_BLOCK_SIZE,
-			.ivsize		= SERPENT_BLOCK_SIZE,
-			.setkey		= lrw_serpent_setkey,
-			.encrypt	= lrw_encrypt,
-			.decrypt	= lrw_decrypt,
-		},
-	},
-}, {
 	.cra_name		= "__xts-serpent-avx2",
 	.cra_driver_name	= "__driver-xts-serpent-avx2",
 	.cra_priority		= 0,
@@ -404,7 +260,6 @@ static struct crypto_alg srp_algs[10] = { {
 	.cra_alignmask		= 0,
 	.cra_type		= &crypto_blkcipher_type,
 	.cra_module		= THIS_MODULE,
-	.cra_list		= LIST_HEAD_INIT(srp_algs[4].cra_list),
 	.cra_u = {
 		.blkcipher = {
 			.min_keysize	= SERPENT_MIN_KEY_SIZE * 2,
@@ -425,7 +280,6 @@ static struct crypto_alg srp_algs[10] = { {
 	.cra_alignmask		= 0,
 	.cra_type		= &crypto_ablkcipher_type,
 	.cra_module		= THIS_MODULE,
-	.cra_list		= LIST_HEAD_INIT(srp_algs[5].cra_list),
 	.cra_init		= ablk_init,
 	.cra_exit		= ablk_exit,
 	.cra_u = {
@@ -447,7 +301,6 @@ static struct crypto_alg srp_algs[10] = { {
 	.cra_alignmask		= 0,
 	.cra_type		= &crypto_ablkcipher_type,
 	.cra_module		= THIS_MODULE,
-	.cra_list		= LIST_HEAD_INIT(srp_algs[6].cra_list),
 	.cra_init		= ablk_init,
 	.cra_exit		= ablk_exit,
 	.cra_u = {
@@ -470,7 +323,6 @@ static struct crypto_alg srp_algs[10] = { {
 	.cra_alignmask		= 0,
 	.cra_type		= &crypto_ablkcipher_type,
 	.cra_module		= THIS_MODULE,
-	.cra_list		= LIST_HEAD_INIT(srp_algs[7].cra_list),
 	.cra_init		= ablk_init,
 	.cra_exit		= ablk_exit,
 	.cra_u = {
@@ -485,31 +337,6 @@ static struct crypto_alg srp_algs[10] = { {
 		},
 	},
 }, {
-	.cra_name		= "lrw(serpent)",
-	.cra_driver_name	= "lrw-serpent-avx2",
-	.cra_priority		= 600,
-	.cra_flags		= CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
-	.cra_blocksize		= SERPENT_BLOCK_SIZE,
-	.cra_ctxsize		= sizeof(struct async_helper_ctx),
-	.cra_alignmask		= 0,
-	.cra_type		= &crypto_ablkcipher_type,
-	.cra_module		= THIS_MODULE,
-	.cra_list		= LIST_HEAD_INIT(srp_algs[8].cra_list),
-	.cra_init		= ablk_init,
-	.cra_exit		= ablk_exit,
-	.cra_u = {
-		.ablkcipher = {
-			.min_keysize	= SERPENT_MIN_KEY_SIZE +
-					  SERPENT_BLOCK_SIZE,
-			.max_keysize	= SERPENT_MAX_KEY_SIZE +
-					  SERPENT_BLOCK_SIZE,
-			.ivsize		= SERPENT_BLOCK_SIZE,
-			.setkey		= ablk_set_key,
-			.encrypt	= ablk_encrypt,
-			.decrypt	= ablk_decrypt,
-		},
-	},
-}, {
 	.cra_name		= "xts(serpent)",
 	.cra_driver_name	= "xts-serpent-avx2",
 	.cra_priority		= 600,
@@ -519,7 +346,6 @@ static struct crypto_alg srp_algs[10] = { {
 	.cra_alignmask		= 0,
 	.cra_type		= &crypto_ablkcipher_type,
 	.cra_module		= THIS_MODULE,
-	.cra_list		= LIST_HEAD_INIT(srp_algs[9].cra_list),
 	.cra_init		= ablk_init,
 	.cra_exit		= ablk_exit,
 	.cra_u = {
diff --git a/crypto/Kconfig b/crypto/Kconfig
index f6d3eec494ee4..fc733a5aa47b8 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -1488,7 +1488,6 @@ config CRYPTO_SERPENT_AVX2_X86_64
 	select CRYPTO_GLUE_HELPER_X86
 	select CRYPTO_SERPENT
 	select CRYPTO_SERPENT_AVX_X86_64
-	select CRYPTO_LRW
 	select CRYPTO_XTS
 	help
 	  Serpent cipher algorithm, by Anderson, Biham & Knudsen.