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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
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#include <linux/crc64.h>
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#include <linux/module.h>
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#include <crypto/internal/hash.h>
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#include <asm/unaligned.h>
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static int chksum_init(struct shash_desc *desc)
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{
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u64 *crc = shash_desc_ctx(desc);
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*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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u64 *crc = shash_desc_ctx(desc);
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*crc = crc64_rocksoft_generic(*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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u64 *crc = shash_desc_ctx(desc);
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put_unaligned_le64(*crc, out);
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return 0;
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}
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static int __chksum_finup(u64 crc, const u8 *data, unsigned int len, u8 *out)
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{
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crc = crc64_rocksoft_generic(crc, data, len);
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put_unaligned_le64(crc, out);
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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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u64 *crc = shash_desc_ctx(desc);
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return __chksum_finup(*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 = sizeof(u64),
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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(u64),
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.base = {
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.cra_name = CRC64_ROCKSOFT_STRING,
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.cra_driver_name = "crc64-rocksoft-generic",
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.cra_priority = 200,
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.cra_blocksize = 1,
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.cra_module = THIS_MODULE,
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}
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};
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static int __init crc64_rocksoft_init(void)
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{
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return crypto_register_shash(&alg);
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}
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static void __exit crc64_rocksoft_exit(void)
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{
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crypto_unregister_shash(&alg);
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}
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module_init(crc64_rocksoft_init);
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module_exit(crc64_rocksoft_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Rocksoft model CRC64 calculation.");
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MODULE_ALIAS_CRYPTO("crc64-rocksoft");
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MODULE_ALIAS_CRYPTO("crc64-rocksoft-generic");
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