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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * See lib/crc64.c for the related specification and polynomial arithmetic.
4 */
5#ifndef _LINUX_CRC64_H
6#define _LINUX_CRC64_H
7
8#include <linux/types.h>
9
10u64 crc64_be_arch(u64 crc, const u8 *p, size_t len);
11u64 crc64_be_generic(u64 crc, const u8 *p, size_t len);
12u64 crc64_nvme_arch(u64 crc, const u8 *p, size_t len);
13u64 crc64_nvme_generic(u64 crc, const u8 *p, size_t len);
14
15/**
16 * crc64_be - Calculate bitwise big-endian ECMA-182 CRC64
17 * @crc: seed value for computation. 0 or (u64)~0 for a new CRC calculation,
18 * or the previous crc64 value if computing incrementally.
19 * @p: pointer to buffer over which CRC64 is run
20 * @len: length of buffer @p
21 */
22static inline u64 crc64_be(u64 crc, const void *p, size_t len)
23{
24 if (IS_ENABLED(CONFIG_CRC64_ARCH))
25 return crc64_be_arch(crc, p, len);
26 return crc64_be_generic(crc, p, len);
27}
28
29/**
30 * crc64_nvme - Calculate CRC64-NVME
31 * @crc: seed value for computation. 0 for a new CRC calculation, or the
32 * previous crc64 value if computing incrementally.
33 * @p: pointer to buffer over which CRC64 is run
34 * @len: length of buffer @p
35 *
36 * This computes the CRC64 defined in the NVME NVM Command Set Specification,
37 * *including the bitwise inversion at the beginning and end*.
38 */
39static inline u64 crc64_nvme(u64 crc, const void *p, size_t len)
40{
41 if (IS_ENABLED(CONFIG_CRC64_ARCH))
42 return ~crc64_nvme_arch(~crc, p, len);
43 return ~crc64_nvme_generic(~crc, p, len);
44}
45
46#endif /* _LINUX_CRC64_H */