1*4882a593Smuzhiyun /* 2*4882a593Smuzhiyun * crc32.h 3*4882a593Smuzhiyun * See linux/lib/crc32.c for license and changes 4*4882a593Smuzhiyun */ 5*4882a593Smuzhiyun #ifndef _LINUX_CRC32_H 6*4882a593Smuzhiyun #define _LINUX_CRC32_H 7*4882a593Smuzhiyun 8*4882a593Smuzhiyun #include <linux/types.h> 9*4882a593Smuzhiyun /* #include <linux/bitrev.h> */ 10*4882a593Smuzhiyun 11*4882a593Smuzhiyun extern u32 crc32_le(u32 crc, unsigned char const *p, size_t len); 12*4882a593Smuzhiyun /* extern u32 crc32_be(u32 crc, unsigned char const *p, size_t len); */ 13*4882a593Smuzhiyun 14*4882a593Smuzhiyun #define crc32(seed, data, length) crc32_le(seed, (unsigned char const *)data, length) 15*4882a593Smuzhiyun 16*4882a593Smuzhiyun /* 17*4882a593Smuzhiyun * Helpers for hash table generation of ethernet nics: 18*4882a593Smuzhiyun * 19*4882a593Smuzhiyun * Ethernet sends the least significant bit of a byte first, thus crc32_le 20*4882a593Smuzhiyun * is used. The output of crc32_le is bit reversed [most significant bit 21*4882a593Smuzhiyun * is in bit nr 0], thus it must be reversed before use. Except for 22*4882a593Smuzhiyun * nics that bit swap the result internally... 23*4882a593Smuzhiyun */ 24*4882a593Smuzhiyun /* #define ether_crc(length, data) bitrev32(crc32_le(~0, data, length)) */ 25*4882a593Smuzhiyun /* #define ether_crc_le(length, data) crc32_le(~0, data, length) */ 26*4882a593Smuzhiyun 27*4882a593Smuzhiyun #endif /* _LINUX_CRC32_H */ 28