mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-16 12:16:43 +07:00
1d481f1cd8
This is a transliteration of the Intel algorithm implemented using SSE and PCLMULQDQ instructions that resides in the file arch/x86/crypto/crct10dif-pcl-asm_64.S, but simplified to only operate on buffers that are 16 byte aligned (but of any size) Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
102 lines
2.3 KiB
C
102 lines
2.3 KiB
C
/*
|
|
* Accelerated CRC-T10DIF using ARM NEON and Crypto Extensions instructions
|
|
*
|
|
* Copyright (C) 2016 Linaro Ltd <ard.biesheuvel@linaro.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/crc-t10dif.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/string.h>
|
|
|
|
#include <crypto/internal/hash.h>
|
|
|
|
#include <asm/neon.h>
|
|
#include <asm/simd.h>
|
|
|
|
#define CRC_T10DIF_PMULL_CHUNK_SIZE 16U
|
|
|
|
asmlinkage u16 crc_t10dif_pmull(u16 init_crc, const u8 buf[], u32 len);
|
|
|
|
static int crct10dif_init(struct shash_desc *desc)
|
|
{
|
|
u16 *crc = shash_desc_ctx(desc);
|
|
|
|
*crc = 0;
|
|
return 0;
|
|
}
|
|
|
|
static int crct10dif_update(struct shash_desc *desc, const u8 *data,
|
|
unsigned int length)
|
|
{
|
|
u16 *crc = shash_desc_ctx(desc);
|
|
unsigned int l;
|
|
|
|
if (!may_use_simd()) {
|
|
*crc = crc_t10dif_generic(*crc, data, length);
|
|
} else {
|
|
if (unlikely((u32)data % CRC_T10DIF_PMULL_CHUNK_SIZE)) {
|
|
l = min_t(u32, length, CRC_T10DIF_PMULL_CHUNK_SIZE -
|
|
((u32)data % CRC_T10DIF_PMULL_CHUNK_SIZE));
|
|
|
|
*crc = crc_t10dif_generic(*crc, data, l);
|
|
|
|
length -= l;
|
|
data += l;
|
|
}
|
|
if (length > 0) {
|
|
kernel_neon_begin();
|
|
*crc = crc_t10dif_pmull(*crc, data, length);
|
|
kernel_neon_end();
|
|
}
|
|
}
|
|
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 crc_t10dif_alg = {
|
|
.digestsize = CRC_T10DIF_DIGEST_SIZE,
|
|
.init = crct10dif_init,
|
|
.update = crct10dif_update,
|
|
.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_hwcap2 & HWCAP2_PMULL))
|
|
return -ENODEV;
|
|
|
|
return crypto_register_shash(&crc_t10dif_alg);
|
|
}
|
|
|
|
static void __exit crc_t10dif_mod_exit(void)
|
|
{
|
|
crypto_unregister_shash(&crc_t10dif_alg);
|
|
}
|
|
|
|
module_init(crc_t10dif_mod_init);
|
|
module_exit(crc_t10dif_mod_exit);
|
|
|
|
MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS_CRYPTO("crct10dif");
|