1*96de2506SJakub Kicinski /* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
2*96de2506SJakub Kicinski /* Copyright (C) 2015-2017 Netronome Systems, Inc. */
3f01a2161SJakub Kicinski
4f01a2161SJakub Kicinski #ifndef NFP_CRC32_H
5f01a2161SJakub Kicinski #define NFP_CRC32_H
6f01a2161SJakub Kicinski
7f01a2161SJakub Kicinski #include <linux/crc32.h>
8f01a2161SJakub Kicinski
9f01a2161SJakub Kicinski /**
10f01a2161SJakub Kicinski * crc32_posix_end() - Finalize POSIX CRC32 working state
11f01a2161SJakub Kicinski * @crc: Current CRC32 working state
12f01a2161SJakub Kicinski * @total_len: Total length of data that was CRC32'd
13f01a2161SJakub Kicinski *
14f01a2161SJakub Kicinski * Return: Final POSIX CRC32 value
15f01a2161SJakub Kicinski */
crc32_posix_end(u32 crc,size_t total_len)16f01a2161SJakub Kicinski static inline u32 crc32_posix_end(u32 crc, size_t total_len)
17f01a2161SJakub Kicinski {
18f01a2161SJakub Kicinski /* Extend with the length of the string. */
19f01a2161SJakub Kicinski while (total_len != 0) {
20f01a2161SJakub Kicinski u8 c = total_len & 0xff;
21f01a2161SJakub Kicinski
22f01a2161SJakub Kicinski crc = crc32_be(crc, &c, 1);
23f01a2161SJakub Kicinski total_len >>= 8;
24f01a2161SJakub Kicinski }
25f01a2161SJakub Kicinski
26f01a2161SJakub Kicinski return ~crc;
27f01a2161SJakub Kicinski }
28f01a2161SJakub Kicinski
crc32_posix(const void * buff,size_t len)29f01a2161SJakub Kicinski static inline u32 crc32_posix(const void *buff, size_t len)
30f01a2161SJakub Kicinski {
31f01a2161SJakub Kicinski return crc32_posix_end(crc32_be(0, buff, len), len);
32f01a2161SJakub Kicinski }
33f01a2161SJakub Kicinski
34f01a2161SJakub Kicinski #endif /* NFP_CRC32_H */
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