| 1 | /* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */ |
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| 2 | /* Copyright (C) 2015-2017 Netronome Systems, Inc. */ |
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| 3 | |
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| 4 | #ifndef NFP_CRC32_H |
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| 5 | #define NFP_CRC32_H |
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| 6 | |
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| 7 | #include <linux/crc32.h> |
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| 8 | |
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| 9 | /** |
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| 10 | * crc32_posix_end() - Finalize POSIX CRC32 working state |
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| 11 | * @crc: Current CRC32 working state |
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| 12 | * @total_len: Total length of data that was CRC32'd |
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| 13 | * |
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| 14 | * Return: Final POSIX CRC32 value |
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| 15 | */ |
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| 16 | static inline u32 crc32_posix_end(u32 crc, size_t total_len) |
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| 17 | { |
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| 18 | /* Extend with the length of the string. */ |
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| 19 | while (total_len != 0) { |
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| 20 | u8 c = total_len & 0xff; |
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| 21 | |
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| 22 | crc = crc32_be(crc, p: &c, len: 1); |
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| 23 | total_len >>= 8; |
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| 24 | } |
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| 25 | |
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| 26 | return ~crc; |
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| 27 | } |
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| 28 | |
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| 29 | static inline u32 crc32_posix(const void *buff, size_t len) |
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| 30 | { |
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| 31 | return crc32_posix_end(crc: crc32_be(crc: 0, p: buff, len), total_len: len); |
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| 32 | } |
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| 33 | |
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| 34 | #endif /* NFP_CRC32_H */ |
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| 35 | |
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