8336bdf12a
The arm64 CRC-T10DIF implementation either uses 8-bit or 64-bit polynomial multiplication instructions, since the latter are faster but not mandatory in the architecture. Since that prevents us from testing both implementations on the same system, let's expose both implementations to the crypto API, with the priorities reflecting that the P64 version is the preferred one if available. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
128 lines
3.2 KiB
C
128 lines
3.2 KiB
C
/*
|
|
* Accelerated CRC-T10DIF using arm64 NEON and Crypto Extensions instructions
|
|
*
|
|
* Copyright (C) 2016 - 2017 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/cpufeature.h>
|
|
#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_p64(u16 init_crc, const u8 buf[], u64 len);
|
|
asmlinkage u16 crc_t10dif_pmull_p8(u16 init_crc, const u8 buf[], u64 len);
|
|
|
|
static int crct10dif_init(struct shash_desc *desc)
|
|
{
|
|
u16 *crc = shash_desc_ctx(desc);
|
|
|
|
*crc = 0;
|
|
return 0;
|
|
}
|
|
|
|
static int crct10dif_update_pmull_p8(struct shash_desc *desc, const u8 *data,
|
|
unsigned int length)
|
|
{
|
|
u16 *crc = shash_desc_ctx(desc);
|
|
|
|
if (length >= CRC_T10DIF_PMULL_CHUNK_SIZE && may_use_simd()) {
|
|
kernel_neon_begin();
|
|
*crc = crc_t10dif_pmull_p8(*crc, data, length);
|
|
kernel_neon_end();
|
|
} else {
|
|
*crc = crc_t10dif_generic(*crc, data, length);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int crct10dif_update_pmull_p64(struct shash_desc *desc, const u8 *data,
|
|
unsigned int length)
|
|
{
|
|
u16 *crc = shash_desc_ctx(desc);
|
|
|
|
if (length >= CRC_T10DIF_PMULL_CHUNK_SIZE && may_use_simd()) {
|
|
kernel_neon_begin();
|
|
*crc = crc_t10dif_pmull_p64(*crc, data, length);
|
|
kernel_neon_end();
|
|
} else {
|
|
*crc = 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 crc_t10dif_alg[] = {{
|
|
.digestsize = CRC_T10DIF_DIGEST_SIZE,
|
|
.init = crct10dif_init,
|
|
.update = crct10dif_update_pmull_p8,
|
|
.final = crct10dif_final,
|
|
.descsize = CRC_T10DIF_DIGEST_SIZE,
|
|
|
|
.base.cra_name = "crct10dif",
|
|
.base.cra_driver_name = "crct10dif-arm64-neon",
|
|
.base.cra_priority = 100,
|
|
.base.cra_blocksize = CRC_T10DIF_BLOCK_SIZE,
|
|
.base.cra_module = THIS_MODULE,
|
|
}, {
|
|
.digestsize = CRC_T10DIF_DIGEST_SIZE,
|
|
.init = crct10dif_init,
|
|
.update = crct10dif_update_pmull_p64,
|
|
.final = crct10dif_final,
|
|
.descsize = CRC_T10DIF_DIGEST_SIZE,
|
|
|
|
.base.cra_name = "crct10dif",
|
|
.base.cra_driver_name = "crct10dif-arm64-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_PMULL)
|
|
return crypto_register_shashes(crc_t10dif_alg,
|
|
ARRAY_SIZE(crc_t10dif_alg));
|
|
else
|
|
/* only register the first array element */
|
|
return crypto_register_shash(crc_t10dif_alg);
|
|
}
|
|
|
|
static void __exit crc_t10dif_mod_exit(void)
|
|
{
|
|
if (elf_hwcap & HWCAP_PMULL)
|
|
crypto_unregister_shashes(crc_t10dif_alg,
|
|
ARRAY_SIZE(crc_t10dif_alg));
|
|
else
|
|
crypto_unregister_shash(crc_t10dif_alg);
|
|
}
|
|
|
|
module_cpu_feature_match(ASIMD, 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");
|
|
MODULE_ALIAS_CRYPTO("crct10dif-arm64-ce");
|