From: Ard Biesheuvel Subject: [RFC PATCH 9/9] crypto: crc-t10dif/x86 - move PMULL based code into core library Date: Fri, 5 Oct 2018 10:13:33 +0200 Message-ID: <20181005081333.15018-10-ard.biesheuvel@linaro.org> References: <20181005081333.15018-1-ard.biesheuvel@linaro.org> Cc: Ard Biesheuvel , "Jason A . Donenfeld" , Eric Biggers , Samuel Neves , Andy Lutomirski , Arnd Bergmann , Herbert Xu , "David S. Miller" , Catalin Marinas , Will Deacon , Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , Thomas Gleixner , Ingo Molnar , Kees Cook , "Martin K. Petersen" , Greg Kroah-Hartman , Andrew Morton To: linux-kernel@vger.kernel.org Return-path: In-Reply-To: <20181005081333.15018-1-ard.biesheuvel@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-crypto.vger.kernel.org Move the PMULL based routines out of the crypto API into the core CRC-T10DIF library. Signed-off-by: Ard Biesheuvel --- arch/x86/crypto/crct10dif-pclmul_glue.c | 98 +++----------------- 1 file changed, 13 insertions(+), 85 deletions(-) diff --git a/arch/x86/crypto/crct10dif-pclmul_glue.c b/arch/x86/crypto/crct10dif-pclmul_glue.c index cd4df9322501..47f0017ad7f3 100644 --- a/arch/x86/crypto/crct10dif-pclmul_glue.c +++ b/arch/x86/crypto/crct10dif-pclmul_glue.c @@ -25,7 +25,7 @@ #include #include #include -#include +#include #include #include #include @@ -36,90 +36,17 @@ asmlinkage __u16 crc_t10dif_pcl(__u16 crc, const unsigned char *buf, size_t len); -struct chksum_desc_ctx { - __u16 crc; -}; - -/* - * Steps through buffer one byte at at time, calculates reflected - * crc using table. - */ - -static int chksum_init(struct shash_desc *desc) -{ - struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); - - ctx->crc = 0; - - return 0; -} - -static int chksum_update(struct shash_desc *desc, const u8 *data, - unsigned int length) -{ - struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); - - if (irq_fpu_usable()) { - kernel_fpu_begin(); - ctx->crc = crc_t10dif_pcl(ctx->crc, data, length); - kernel_fpu_end(); - } else - ctx->crc = crc_t10dif_generic(ctx->crc, data, length); - return 0; -} - -static int chksum_final(struct shash_desc *desc, u8 *out) -{ - struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); - - *(__u16 *)out = ctx->crc; - return 0; -} - -static int __chksum_finup(__u16 *crcp, const u8 *data, unsigned int len, - u8 *out) +static __u16 crct10dif_update_x86(__u16 crc, const u8 *data, unsigned int length) { if (irq_fpu_usable()) { kernel_fpu_begin(); - *(__u16 *)out = crc_t10dif_pcl(*crcp, data, len); + crc = crc_t10dif_pcl(crc, data, length); kernel_fpu_end(); - } else - *(__u16 *)out = crc_t10dif_generic(*crcp, data, len); - return 0; -} - -static int chksum_finup(struct shash_desc *desc, const u8 *data, - unsigned int len, u8 *out) -{ - struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); - - return __chksum_finup(&ctx->crc, data, len, out); -} - -static int chksum_digest(struct shash_desc *desc, const u8 *data, - unsigned int length, u8 *out) -{ - struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); - - return __chksum_finup(&ctx->crc, data, length, out); -} - -static struct shash_alg alg = { - .digestsize = CRC_T10DIF_DIGEST_SIZE, - .init = chksum_init, - .update = chksum_update, - .final = chksum_final, - .finup = chksum_finup, - .digest = chksum_digest, - .descsize = sizeof(struct chksum_desc_ctx), - .base = { - .cra_name = "crct10dif", - .cra_driver_name = "crct10dif-pclmul", - .cra_priority = 200, - .cra_blocksize = CRC_T10DIF_BLOCK_SIZE, - .cra_module = THIS_MODULE, + } else { + crc = crc_t10dif_generic(crc, data, length); } -}; + return crc; +} static const struct x86_cpu_id crct10dif_cpu_id[] = { X86_FEATURE_MATCH(X86_FEATURE_PCLMULQDQ), @@ -132,12 +59,16 @@ static int __init crct10dif_intel_mod_init(void) if (!x86_match_cpu(crct10dif_cpu_id)) return -ENODEV; - return crypto_register_shash(&alg); + SET_FFP(crc_t10dif_update_arch, crct10dif_update_x86); + + return 0; } static void __exit crct10dif_intel_mod_fini(void) { - crypto_unregister_shash(&alg); + RESET_FFP(crc_t10dif_update_arch); + /* wait for all users to switch back to the old version */ + synchronize_rcu(); } module_init(crct10dif_intel_mod_init); @@ -146,6 +77,3 @@ module_exit(crct10dif_intel_mod_fini); MODULE_AUTHOR("Tim Chen "); MODULE_DESCRIPTION("T10 DIF CRC calculation accelerated with PCLMULQDQ."); MODULE_LICENSE("GPL"); - -MODULE_ALIAS_CRYPTO("crct10dif"); -MODULE_ALIAS_CRYPTO("crct10dif-pclmul"); -- 2.11.0