mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-16 01:04:08 +08:00
f3813f4b28
Hardware specific features may be able to calculate a crc64, so provide a framework for drivers to register their implementation. If nothing is registered, fallback to the generic table lookup implementation. The implementation is modeled after the crct10dif equivalent. Signed-off-by: Keith Busch <kbusch@kernel.org> Link: https://lore.kernel.org/r/20220303201312.3255347-7-kbusch@kernel.org Signed-off-by: Jens Axboe <axboe@kernel.dk>
90 lines
1.9 KiB
C
90 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
|
|
#include <linux/crc64.h>
|
|
#include <linux/module.h>
|
|
#include <crypto/internal/hash.h>
|
|
#include <asm/unaligned.h>
|
|
|
|
static int chksum_init(struct shash_desc *desc)
|
|
{
|
|
u64 *crc = shash_desc_ctx(desc);
|
|
|
|
*crc = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int chksum_update(struct shash_desc *desc, const u8 *data,
|
|
unsigned int length)
|
|
{
|
|
u64 *crc = shash_desc_ctx(desc);
|
|
|
|
*crc = crc64_rocksoft_generic(*crc, data, length);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int chksum_final(struct shash_desc *desc, u8 *out)
|
|
{
|
|
u64 *crc = shash_desc_ctx(desc);
|
|
|
|
put_unaligned_le64(*crc, out);
|
|
return 0;
|
|
}
|
|
|
|
static int __chksum_finup(u64 crc, const u8 *data, unsigned int len, u8 *out)
|
|
{
|
|
crc = crc64_rocksoft_generic(crc, data, len);
|
|
put_unaligned_le64(crc, out);
|
|
return 0;
|
|
}
|
|
|
|
static int chksum_finup(struct shash_desc *desc, const u8 *data,
|
|
unsigned int len, u8 *out)
|
|
{
|
|
u64 *crc = shash_desc_ctx(desc);
|
|
|
|
return __chksum_finup(*crc, data, len, out);
|
|
}
|
|
|
|
static int chksum_digest(struct shash_desc *desc, const u8 *data,
|
|
unsigned int length, u8 *out)
|
|
{
|
|
return __chksum_finup(0, data, length, out);
|
|
}
|
|
|
|
static struct shash_alg alg = {
|
|
.digestsize = sizeof(u64),
|
|
.init = chksum_init,
|
|
.update = chksum_update,
|
|
.final = chksum_final,
|
|
.finup = chksum_finup,
|
|
.digest = chksum_digest,
|
|
.descsize = sizeof(u64),
|
|
.base = {
|
|
.cra_name = CRC64_ROCKSOFT_STRING,
|
|
.cra_driver_name = "crc64-rocksoft-generic",
|
|
.cra_priority = 200,
|
|
.cra_blocksize = 1,
|
|
.cra_module = THIS_MODULE,
|
|
}
|
|
};
|
|
|
|
static int __init crc64_rocksoft_init(void)
|
|
{
|
|
return crypto_register_shash(&alg);
|
|
}
|
|
|
|
static void __exit crc64_rocksoft_exit(void)
|
|
{
|
|
crypto_unregister_shash(&alg);
|
|
}
|
|
|
|
module_init(crc64_rocksoft_init);
|
|
module_exit(crc64_rocksoft_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Rocksoft model CRC64 calculation.");
|
|
MODULE_ALIAS_CRYPTO("crc64-rocksoft");
|
|
MODULE_ALIAS_CRYPTO("crc64-rocksoft-generic");
|