1 /* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */ 2 /* Copyright (C) 2015-2017 Netronome Systems, Inc. */ 3 4 #ifndef NFP_CRC32_H 5 #define NFP_CRC32_H 6 7 #include <linux/kernel.h> 8 #include <linux/crc32.h> 9 10 /** 11 * crc32_posix_end() - Finalize POSIX CRC32 working state 12 * @crc: Current CRC32 working state 13 * @total_len: Total length of data that was CRC32'd 14 * 15 * Return: Final POSIX CRC32 value 16 */ 17 static inline u32 crc32_posix_end(u32 crc, size_t total_len) 18 { 19 /* Extend with the length of the string. */ 20 while (total_len != 0) { 21 u8 c = total_len & 0xff; 22 23 crc = crc32_be(crc, &c, 1); 24 total_len >>= 8; 25 } 26 27 return ~crc; 28 } 29 30 static inline u32 crc32_posix(const void *buff, size_t len) 31 { 32 return crc32_posix_end(crc32_be(0, buff, len), len); 33 } 34 35 #endif /* NFP_CRC32_H */ 36