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143 lines
3.7 KiB
143 lines
3.7 KiB
/* |
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* Cryptographic API. |
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* |
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* T10 Data Integrity Field CRC16 Crypto Transform using PCLMULQDQ Instructions |
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* |
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* Copyright (C) 2013 Intel Corporation |
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* Author: Tim Chen <[email protected]> |
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* |
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* This program is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License as published by the Free |
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* Software Foundation; either version 2 of the License, or (at your option) |
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* any later version. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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* SOFTWARE. |
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* |
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*/ |
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#include <linux/types.h> |
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#include <linux/module.h> |
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#include <linux/crc-t10dif.h> |
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#include <crypto/internal/hash.h> |
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#include <crypto/internal/simd.h> |
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#include <linux/init.h> |
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#include <linux/string.h> |
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#include <linux/kernel.h> |
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#include <asm/cpufeatures.h> |
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#include <asm/cpu_device_id.h> |
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#include <asm/simd.h> |
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asmlinkage u16 crc_t10dif_pcl(u16 init_crc, const u8 *buf, size_t len); |
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struct chksum_desc_ctx { |
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__u16 crc; |
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}; |
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static int chksum_init(struct shash_desc *desc) |
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{ |
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struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); |
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ctx->crc = 0; |
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return 0; |
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} |
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static int chksum_update(struct shash_desc *desc, const u8 *data, |
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unsigned int length) |
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{ |
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struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); |
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if (length >= 16 && crypto_simd_usable()) { |
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kernel_fpu_begin(); |
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ctx->crc = crc_t10dif_pcl(ctx->crc, data, length); |
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kernel_fpu_end(); |
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} else |
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ctx->crc = crc_t10dif_generic(ctx->crc, data, length); |
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return 0; |
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} |
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static int chksum_final(struct shash_desc *desc, u8 *out) |
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{ |
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struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); |
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*(__u16 *)out = ctx->crc; |
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return 0; |
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} |
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static int __chksum_finup(__u16 crc, const u8 *data, unsigned int len, u8 *out) |
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{ |
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if (len >= 16 && crypto_simd_usable()) { |
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kernel_fpu_begin(); |
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*(__u16 *)out = crc_t10dif_pcl(crc, data, len); |
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kernel_fpu_end(); |
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} else |
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*(__u16 *)out = crc_t10dif_generic(crc, data, len); |
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return 0; |
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} |
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static int chksum_finup(struct shash_desc *desc, const u8 *data, |
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unsigned int len, u8 *out) |
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{ |
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struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); |
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return __chksum_finup(ctx->crc, data, len, out); |
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} |
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static int chksum_digest(struct shash_desc *desc, const u8 *data, |
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unsigned int length, u8 *out) |
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{ |
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return __chksum_finup(0, data, length, out); |
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} |
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static struct shash_alg alg = { |
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.digestsize = CRC_T10DIF_DIGEST_SIZE, |
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.init = chksum_init, |
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.update = chksum_update, |
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.final = chksum_final, |
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.finup = chksum_finup, |
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.digest = chksum_digest, |
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.descsize = sizeof(struct chksum_desc_ctx), |
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.base = { |
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.cra_name = "crct10dif", |
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.cra_driver_name = "crct10dif-pclmul", |
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.cra_priority = 200, |
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.cra_blocksize = CRC_T10DIF_BLOCK_SIZE, |
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.cra_module = THIS_MODULE, |
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} |
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}; |
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static const struct x86_cpu_id crct10dif_cpu_id[] = { |
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X86_MATCH_FEATURE(X86_FEATURE_PCLMULQDQ, NULL), |
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{} |
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}; |
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MODULE_DEVICE_TABLE(x86cpu, crct10dif_cpu_id); |
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static int __init crct10dif_intel_mod_init(void) |
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{ |
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if (!x86_match_cpu(crct10dif_cpu_id)) |
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return -ENODEV; |
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return crypto_register_shash(&alg); |
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} |
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static void __exit crct10dif_intel_mod_fini(void) |
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{ |
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crypto_unregister_shash(&alg); |
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} |
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module_init(crct10dif_intel_mod_init); |
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module_exit(crct10dif_intel_mod_fini); |
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MODULE_AUTHOR("Tim Chen <[email protected]>"); |
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MODULE_DESCRIPTION("T10 DIF CRC calculation accelerated with PCLMULQDQ."); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS_CRYPTO("crct10dif"); |
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MODULE_ALIAS_CRYPTO("crct10dif-pclmul");
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