forked from Minki/linux
68411521cc
This patch reinstates commits67822649d739761214ee0b95a7f85731d939625a2d31e518a4Now that module softdeps are in the kernel we can use that to resolve the boot issue which cause the revert. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
152 lines
3.8 KiB
C
152 lines
3.8 KiB
C
/*
|
|
* Cryptographic API.
|
|
*
|
|
* T10 Data Integrity Field CRC16 Crypto Transform using PCLMULQDQ Instructions
|
|
*
|
|
* Copyright (C) 2013 Intel Corporation
|
|
* Author: Tim Chen <tim.c.chen@linux.intel.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the Free
|
|
* Software Foundation; either version 2 of the License, or (at your option)
|
|
* any later version.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
|
|
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
|
|
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
|
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
* SOFTWARE.
|
|
*
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/module.h>
|
|
#include <linux/crc-t10dif.h>
|
|
#include <crypto/internal/hash.h>
|
|
#include <linux/init.h>
|
|
#include <linux/string.h>
|
|
#include <linux/kernel.h>
|
|
#include <asm/i387.h>
|
|
#include <asm/cpufeature.h>
|
|
#include <asm/cpu_device_id.h>
|
|
|
|
asmlinkage __u16 crc_t10dif_pcl(__u16 crc, const unsigned char *buf,
|
|
size_t len);
|
|
|
|
struct chksum_desc_ctx {
|
|
__u16 crc;
|
|
};
|
|
|
|
/*
|
|
* Steps through buffer one byte at at time, calculates reflected
|
|
* crc using table.
|
|
*/
|
|
|
|
static int chksum_init(struct shash_desc *desc)
|
|
{
|
|
struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
|
|
|
|
ctx->crc = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int chksum_update(struct shash_desc *desc, const u8 *data,
|
|
unsigned int length)
|
|
{
|
|
struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
|
|
|
|
if (irq_fpu_usable()) {
|
|
kernel_fpu_begin();
|
|
ctx->crc = crc_t10dif_pcl(ctx->crc, data, length);
|
|
kernel_fpu_end();
|
|
} else
|
|
ctx->crc = crc_t10dif_generic(ctx->crc, data, length);
|
|
return 0;
|
|
}
|
|
|
|
static int chksum_final(struct shash_desc *desc, u8 *out)
|
|
{
|
|
struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
|
|
|
|
*(__u16 *)out = ctx->crc;
|
|
return 0;
|
|
}
|
|
|
|
static int __chksum_finup(__u16 *crcp, const u8 *data, unsigned int len,
|
|
u8 *out)
|
|
{
|
|
if (irq_fpu_usable()) {
|
|
kernel_fpu_begin();
|
|
*(__u16 *)out = crc_t10dif_pcl(*crcp, data, len);
|
|
kernel_fpu_end();
|
|
} else
|
|
*(__u16 *)out = crc_t10dif_generic(*crcp, data, len);
|
|
return 0;
|
|
}
|
|
|
|
static int chksum_finup(struct shash_desc *desc, const u8 *data,
|
|
unsigned int len, u8 *out)
|
|
{
|
|
struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
|
|
|
|
return __chksum_finup(&ctx->crc, data, len, out);
|
|
}
|
|
|
|
static int chksum_digest(struct shash_desc *desc, const u8 *data,
|
|
unsigned int length, u8 *out)
|
|
{
|
|
struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
|
|
|
|
return __chksum_finup(&ctx->crc, data, length, out);
|
|
}
|
|
|
|
static struct shash_alg alg = {
|
|
.digestsize = CRC_T10DIF_DIGEST_SIZE,
|
|
.init = chksum_init,
|
|
.update = chksum_update,
|
|
.final = chksum_final,
|
|
.finup = chksum_finup,
|
|
.digest = chksum_digest,
|
|
.descsize = sizeof(struct chksum_desc_ctx),
|
|
.base = {
|
|
.cra_name = "crct10dif",
|
|
.cra_driver_name = "crct10dif-pclmul",
|
|
.cra_priority = 200,
|
|
.cra_blocksize = CRC_T10DIF_BLOCK_SIZE,
|
|
.cra_module = THIS_MODULE,
|
|
}
|
|
};
|
|
|
|
static const struct x86_cpu_id crct10dif_cpu_id[] = {
|
|
X86_FEATURE_MATCH(X86_FEATURE_PCLMULQDQ),
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(x86cpu, crct10dif_cpu_id);
|
|
|
|
static int __init crct10dif_intel_mod_init(void)
|
|
{
|
|
if (!x86_match_cpu(crct10dif_cpu_id))
|
|
return -ENODEV;
|
|
|
|
return crypto_register_shash(&alg);
|
|
}
|
|
|
|
static void __exit crct10dif_intel_mod_fini(void)
|
|
{
|
|
crypto_unregister_shash(&alg);
|
|
}
|
|
|
|
module_init(crct10dif_intel_mod_init);
|
|
module_exit(crct10dif_intel_mod_fini);
|
|
|
|
MODULE_AUTHOR("Tim Chen <tim.c.chen@linux.intel.com>");
|
|
MODULE_DESCRIPTION("T10 DIF CRC calculation accelerated with PCLMULQDQ.");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
MODULE_ALIAS("crct10dif");
|
|
MODULE_ALIAS("crct10dif-pclmul");
|