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143 lines
3.5 KiB
143 lines
3.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Accelerated CRC-T10DIF using arm64 NEON and Crypto Extensions instructions |
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* |
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* Copyright (C) 2016 - 2017 Linaro Ltd <[email protected]> |
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*/ |
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#include <linux/cpufeature.h> |
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#include <linux/crc-t10dif.h> |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/string.h> |
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#include <crypto/internal/hash.h> |
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#include <crypto/internal/simd.h> |
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#include <asm/neon.h> |
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#include <asm/simd.h> |
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#define CRC_T10DIF_PMULL_CHUNK_SIZE 16U |
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asmlinkage u16 crc_t10dif_pmull_p8(u16 init_crc, const u8 *buf, size_t len); |
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asmlinkage u16 crc_t10dif_pmull_p64(u16 init_crc, const u8 *buf, size_t len); |
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static int crct10dif_init(struct shash_desc *desc) |
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{ |
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u16 *crc = shash_desc_ctx(desc); |
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*crc = 0; |
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return 0; |
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} |
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static int crct10dif_update_pmull_p8(struct shash_desc *desc, const u8 *data, |
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unsigned int length) |
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{ |
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u16 *crc = shash_desc_ctx(desc); |
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if (length >= CRC_T10DIF_PMULL_CHUNK_SIZE && crypto_simd_usable()) { |
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do { |
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unsigned int chunk = length; |
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if (chunk > SZ_4K + CRC_T10DIF_PMULL_CHUNK_SIZE) |
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chunk = SZ_4K; |
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kernel_neon_begin(); |
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*crc = crc_t10dif_pmull_p8(*crc, data, chunk); |
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kernel_neon_end(); |
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data += chunk; |
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length -= chunk; |
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} while (length); |
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} else { |
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*crc = crc_t10dif_generic(*crc, data, length); |
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} |
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return 0; |
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} |
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static int crct10dif_update_pmull_p64(struct shash_desc *desc, const u8 *data, |
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unsigned int length) |
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{ |
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u16 *crc = shash_desc_ctx(desc); |
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if (length >= CRC_T10DIF_PMULL_CHUNK_SIZE && crypto_simd_usable()) { |
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do { |
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unsigned int chunk = length; |
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if (chunk > SZ_4K + CRC_T10DIF_PMULL_CHUNK_SIZE) |
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chunk = SZ_4K; |
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kernel_neon_begin(); |
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*crc = crc_t10dif_pmull_p64(*crc, data, chunk); |
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kernel_neon_end(); |
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data += chunk; |
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length -= chunk; |
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} while (length); |
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} else { |
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*crc = crc_t10dif_generic(*crc, data, length); |
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} |
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return 0; |
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} |
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static int crct10dif_final(struct shash_desc *desc, u8 *out) |
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{ |
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u16 *crc = shash_desc_ctx(desc); |
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*(u16 *)out = *crc; |
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return 0; |
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} |
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static struct shash_alg crc_t10dif_alg[] = {{ |
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.digestsize = CRC_T10DIF_DIGEST_SIZE, |
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.init = crct10dif_init, |
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.update = crct10dif_update_pmull_p8, |
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.final = crct10dif_final, |
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.descsize = CRC_T10DIF_DIGEST_SIZE, |
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.base.cra_name = "crct10dif", |
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.base.cra_driver_name = "crct10dif-arm64-neon", |
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.base.cra_priority = 100, |
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.base.cra_blocksize = CRC_T10DIF_BLOCK_SIZE, |
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.base.cra_module = THIS_MODULE, |
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}, { |
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.digestsize = CRC_T10DIF_DIGEST_SIZE, |
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.init = crct10dif_init, |
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.update = crct10dif_update_pmull_p64, |
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.final = crct10dif_final, |
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.descsize = CRC_T10DIF_DIGEST_SIZE, |
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.base.cra_name = "crct10dif", |
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.base.cra_driver_name = "crct10dif-arm64-ce", |
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.base.cra_priority = 200, |
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.base.cra_blocksize = CRC_T10DIF_BLOCK_SIZE, |
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.base.cra_module = THIS_MODULE, |
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}}; |
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static int __init crc_t10dif_mod_init(void) |
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{ |
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if (cpu_have_named_feature(PMULL)) |
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return crypto_register_shashes(crc_t10dif_alg, |
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ARRAY_SIZE(crc_t10dif_alg)); |
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else |
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/* only register the first array element */ |
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return crypto_register_shash(crc_t10dif_alg); |
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} |
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static void __exit crc_t10dif_mod_exit(void) |
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{ |
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if (cpu_have_named_feature(PMULL)) |
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crypto_unregister_shashes(crc_t10dif_alg, |
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ARRAY_SIZE(crc_t10dif_alg)); |
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else |
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crypto_unregister_shash(crc_t10dif_alg); |
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} |
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module_cpu_feature_match(ASIMD, crc_t10dif_mod_init); |
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module_exit(crc_t10dif_mod_exit); |
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MODULE_AUTHOR("Ard Biesheuvel <[email protected]>"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_ALIAS_CRYPTO("crct10dif"); |
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MODULE_ALIAS_CRYPTO("crct10dif-arm64-ce");
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