From 1684e8293605062dee45a5e4118fe8db6cd0d9d9 Mon Sep 17 00:00:00 2001 From: Eric Biggers Date: Sun, 1 Dec 2024 17:20:49 -0800 Subject: [PATCH] arm/crc-t10dif: expose CRC-T10DIF function through lib Move the arm CRC-T10DIF assembly code into the lib directory and wire it up to the library interface. This allows it to be used without going through the crypto API. It remains usable via the crypto API too via the shash algorithms that use the library interface. Thus all the arch-specific "shash" code becomes unnecessary and is removed. Note: to see the diff from arch/arm/crypto/crct10dif-ce-glue.c to arch/arm/lib/crc-t10dif-glue.c, view this commit with 'git show -M10'. Reviewed-by: Ard Biesheuvel Reviewed-by: Martin K. Petersen Link: https://lore.kernel.org/r/20241202012056.209768-6-ebiggers@kernel.org Signed-off-by: Eric Biggers --- arch/arm/Kconfig | 1 + arch/arm/crypto/Kconfig | 11 -- arch/arm/crypto/Makefile | 2 - arch/arm/crypto/crct10dif-ce-glue.c | 124 ------------------ arch/arm/lib/Makefile | 3 + .../crc-t10dif-core.S} | 0 arch/arm/lib/crc-t10dif-glue.c | 80 +++++++++++ 7 files changed, 84 insertions(+), 137 deletions(-) delete mode 100644 arch/arm/crypto/crct10dif-ce-glue.c rename arch/arm/{crypto/crct10dif-ce-core.S => lib/crc-t10dif-core.S} (100%) create mode 100644 arch/arm/lib/crc-t10dif-glue.c diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index f817ca317b02a..3ad4c3c979180 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -8,6 +8,7 @@ config ARM select ARCH_HAS_CPU_CACHE_ALIASING select ARCH_HAS_CPU_FINALIZE_INIT if MMU select ARCH_HAS_CRC32 if KERNEL_MODE_NEON + select ARCH_HAS_CRC_T10DIF if KERNEL_MODE_NEON select ARCH_HAS_CURRENT_STACK_POINTER select ARCH_HAS_DEBUG_VIRTUAL if MMU select ARCH_HAS_DMA_ALLOC if MMU diff --git a/arch/arm/crypto/Kconfig b/arch/arm/crypto/Kconfig index ea0ebf336d0de..32650c8431d98 100644 --- a/arch/arm/crypto/Kconfig +++ b/arch/arm/crypto/Kconfig @@ -222,16 +222,5 @@ config CRYPTO_CHACHA20_NEON Architecture: arm using: - NEON (Advanced SIMD) extensions -config CRYPTO_CRCT10DIF_ARM_CE - tristate "CRCT10DIF" - depends on KERNEL_MODE_NEON - depends on CRC_T10DIF - select CRYPTO_HASH - help - CRC16 CRC algorithm used for the T10 (SCSI) Data Integrity Field (DIF) - - Architecture: arm using: - - PMULL (Polynomial Multiply Long) instructions - endmenu diff --git a/arch/arm/crypto/Makefile b/arch/arm/crypto/Makefile index 38ec5cc1e8442..3d0e23ff9e746 100644 --- a/arch/arm/crypto/Makefile +++ b/arch/arm/crypto/Makefile @@ -20,7 +20,6 @@ obj-$(CONFIG_CRYPTO_AES_ARM_CE) += aes-arm-ce.o obj-$(CONFIG_CRYPTO_SHA1_ARM_CE) += sha1-arm-ce.o obj-$(CONFIG_CRYPTO_SHA2_ARM_CE) += sha2-arm-ce.o obj-$(CONFIG_CRYPTO_GHASH_ARM_CE) += ghash-arm-ce.o -obj-$(CONFIG_CRYPTO_CRCT10DIF_ARM_CE) += crct10dif-arm-ce.o aes-arm-y := aes-cipher-core.o aes-cipher-glue.o aes-arm-bs-y := aes-neonbs-core.o aes-neonbs-glue.o @@ -36,7 +35,6 @@ sha1-arm-ce-y := sha1-ce-core.o sha1-ce-glue.o sha2-arm-ce-y := sha2-ce-core.o sha2-ce-glue.o aes-arm-ce-y := aes-ce-core.o aes-ce-glue.o ghash-arm-ce-y := ghash-ce-core.o ghash-ce-glue.o -crct10dif-arm-ce-y := crct10dif-ce-core.o crct10dif-ce-glue.o chacha-neon-y := chacha-scalar-core.o chacha-glue.o chacha-neon-$(CONFIG_KERNEL_MODE_NEON) += chacha-neon-core.o poly1305-arm-y := poly1305-core.o poly1305-glue.o diff --git a/arch/arm/crypto/crct10dif-ce-glue.c b/arch/arm/crypto/crct10dif-ce-glue.c deleted file mode 100644 index a8b74523729ee..0000000000000 --- a/arch/arm/crypto/crct10dif-ce-glue.c +++ /dev/null @@ -1,124 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * Accelerated CRC-T10DIF using ARM NEON and Crypto Extensions instructions - * - * Copyright (C) 2016 Linaro Ltd - */ - -#include -#include -#include -#include -#include - -#include -#include - -#include -#include - -#define CRC_T10DIF_PMULL_CHUNK_SIZE 16U - -asmlinkage u16 crc_t10dif_pmull64(u16 init_crc, const u8 *buf, size_t len); -asmlinkage void crc_t10dif_pmull8(u16 init_crc, const u8 *buf, size_t len, - u8 out[16]); - -static int crct10dif_init(struct shash_desc *desc) -{ - u16 *crc = shash_desc_ctx(desc); - - *crc = 0; - return 0; -} - -static int crct10dif_update_ce(struct shash_desc *desc, const u8 *data, - unsigned int length) -{ - u16 *crc = shash_desc_ctx(desc); - - if (length >= CRC_T10DIF_PMULL_CHUNK_SIZE && crypto_simd_usable()) { - kernel_neon_begin(); - *crc = crc_t10dif_pmull64(*crc, data, length); - kernel_neon_end(); - } else { - *crc = crc_t10dif_generic(*crc, data, length); - } - - return 0; -} - -static int crct10dif_update_neon(struct shash_desc *desc, const u8 *data, - unsigned int length) -{ - u16 *crcp = shash_desc_ctx(desc); - u8 buf[16] __aligned(16); - u16 crc = *crcp; - - if (length > CRC_T10DIF_PMULL_CHUNK_SIZE && crypto_simd_usable()) { - kernel_neon_begin(); - crc_t10dif_pmull8(crc, data, length, buf); - kernel_neon_end(); - - crc = 0; - data = buf; - length = sizeof(buf); - } - - *crcp = crc_t10dif_generic(crc, data, length); - return 0; -} - -static int crct10dif_final(struct shash_desc *desc, u8 *out) -{ - u16 *crc = shash_desc_ctx(desc); - - *(u16 *)out = *crc; - return 0; -} - -static struct shash_alg algs[] = {{ - .digestsize = CRC_T10DIF_DIGEST_SIZE, - .init = crct10dif_init, - .update = crct10dif_update_neon, - .final = crct10dif_final, - .descsize = CRC_T10DIF_DIGEST_SIZE, - - .base.cra_name = "crct10dif", - .base.cra_driver_name = "crct10dif-arm-neon", - .base.cra_priority = 150, - .base.cra_blocksize = CRC_T10DIF_BLOCK_SIZE, - .base.cra_module = THIS_MODULE, -}, { - .digestsize = CRC_T10DIF_DIGEST_SIZE, - .init = crct10dif_init, - .update = crct10dif_update_ce, - .final = crct10dif_final, - .descsize = CRC_T10DIF_DIGEST_SIZE, - - .base.cra_name = "crct10dif", - .base.cra_driver_name = "crct10dif-arm-ce", - .base.cra_priority = 200, - .base.cra_blocksize = CRC_T10DIF_BLOCK_SIZE, - .base.cra_module = THIS_MODULE, -}}; - -static int __init crc_t10dif_mod_init(void) -{ - if (!(elf_hwcap & HWCAP_NEON)) - return -ENODEV; - - return crypto_register_shashes(algs, 1 + !!(elf_hwcap2 & HWCAP2_PMULL)); -} - -static void __exit crc_t10dif_mod_exit(void) -{ - crypto_unregister_shashes(algs, 1 + !!(elf_hwcap2 & HWCAP2_PMULL)); -} - -module_init(crc_t10dif_mod_init); -module_exit(crc_t10dif_mod_exit); - -MODULE_AUTHOR("Ard Biesheuvel "); -MODULE_DESCRIPTION("Accelerated CRC-T10DIF using ARM NEON and Crypto Extensions"); -MODULE_LICENSE("GPL v2"); -MODULE_ALIAS_CRYPTO("crct10dif"); diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile index 01cd4db2ed472..007874320937d 100644 --- a/arch/arm/lib/Makefile +++ b/arch/arm/lib/Makefile @@ -48,3 +48,6 @@ obj-$(CONFIG_FUNCTION_ERROR_INJECTION) += error-inject.o obj-$(CONFIG_CRC32_ARCH) += crc32-arm.o crc32-arm-y := crc32-glue.o crc32-core.o + +obj-$(CONFIG_CRC_T10DIF_ARCH) += crc-t10dif-arm.o +crc-t10dif-arm-y := crc-t10dif-glue.o crc-t10dif-core.o diff --git a/arch/arm/crypto/crct10dif-ce-core.S b/arch/arm/lib/crc-t10dif-core.S similarity index 100% rename from arch/arm/crypto/crct10dif-ce-core.S rename to arch/arm/lib/crc-t10dif-core.S diff --git a/arch/arm/lib/crc-t10dif-glue.c b/arch/arm/lib/crc-t10dif-glue.c new file mode 100644 index 0000000000000..d24dee62670ec --- /dev/null +++ b/arch/arm/lib/crc-t10dif-glue.c @@ -0,0 +1,80 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Accelerated CRC-T10DIF using ARM NEON and Crypto Extensions instructions + * + * Copyright (C) 2016 Linaro Ltd + */ + +#include +#include +#include +#include +#include + +#include + +#include +#include + +static DEFINE_STATIC_KEY_FALSE(have_neon); +static DEFINE_STATIC_KEY_FALSE(have_pmull); + +#define CRC_T10DIF_PMULL_CHUNK_SIZE 16U + +asmlinkage u16 crc_t10dif_pmull64(u16 init_crc, const u8 *buf, size_t len); +asmlinkage void crc_t10dif_pmull8(u16 init_crc, const u8 *buf, size_t len, + u8 out[16]); + +u16 crc_t10dif_arch(u16 crc, const u8 *data, size_t length) +{ + if (length >= CRC_T10DIF_PMULL_CHUNK_SIZE) { + if (static_branch_likely(&have_pmull)) { + if (crypto_simd_usable()) { + kernel_neon_begin(); + crc = crc_t10dif_pmull64(crc, data, length); + kernel_neon_end(); + return crc; + } + } else if (length > CRC_T10DIF_PMULL_CHUNK_SIZE && + static_branch_likely(&have_neon) && + crypto_simd_usable()) { + u8 buf[16] __aligned(16); + + kernel_neon_begin(); + crc_t10dif_pmull8(crc, data, length, buf); + kernel_neon_end(); + + crc = 0; + data = buf; + length = sizeof(buf); + } + } + return crc_t10dif_generic(crc, data, length); +} +EXPORT_SYMBOL(crc_t10dif_arch); + +static int __init crc_t10dif_arm_init(void) +{ + if (elf_hwcap & HWCAP_NEON) { + static_branch_enable(&have_neon); + if (elf_hwcap2 & HWCAP2_PMULL) + static_branch_enable(&have_pmull); + } + return 0; +} +arch_initcall(crc_t10dif_arm_init); + +static void __exit crc_t10dif_arm_exit(void) +{ +} +module_exit(crc_t10dif_arm_exit); + +bool crc_t10dif_is_optimized(void) +{ + return static_key_enabled(&have_neon); +} +EXPORT_SYMBOL(crc_t10dif_is_optimized); + +MODULE_AUTHOR("Ard Biesheuvel "); +MODULE_DESCRIPTION("Accelerated CRC-T10DIF using ARM NEON and Crypto Extensions"); +MODULE_LICENSE("GPL v2");