17e6ee7adSKyungmin Park /* 27e6ee7adSKyungmin Park * crc32.h 37e6ee7adSKyungmin Park * See linux/lib/crc32.c for license and changes 47e6ee7adSKyungmin Park */ 57e6ee7adSKyungmin Park #ifndef _LINUX_CRC32_H 67e6ee7adSKyungmin Park #define _LINUX_CRC32_H 77e6ee7adSKyungmin Park 87e6ee7adSKyungmin Park #include <linux/types.h> 9*455ae7e8SWolfgang Denk /* #include <linux/bitrev.h> */ 107e6ee7adSKyungmin Park 117e6ee7adSKyungmin Park extern u32 crc32_le(u32 crc, unsigned char const *p, size_t len); 12*455ae7e8SWolfgang Denk /* extern u32 crc32_be(u32 crc, unsigned char const *p, size_t len); */ 137e6ee7adSKyungmin Park 147e6ee7adSKyungmin Park #define crc32(seed, data, length) crc32_le(seed, (unsigned char const *)data, length) 157e6ee7adSKyungmin Park 167e6ee7adSKyungmin Park /* 177e6ee7adSKyungmin Park * Helpers for hash table generation of ethernet nics: 187e6ee7adSKyungmin Park * 197e6ee7adSKyungmin Park * Ethernet sends the least significant bit of a byte first, thus crc32_le 207e6ee7adSKyungmin Park * is used. The output of crc32_le is bit reversed [most significant bit 217e6ee7adSKyungmin Park * is in bit nr 0], thus it must be reversed before use. Except for 227e6ee7adSKyungmin Park * nics that bit swap the result internally... 237e6ee7adSKyungmin Park */ 24*455ae7e8SWolfgang Denk /* #define ether_crc(length, data) bitrev32(crc32_le(~0, data, length)) */ 25*455ae7e8SWolfgang Denk /* #define ether_crc_le(length, data) crc32_le(~0, data, length) */ 267e6ee7adSKyungmin Park 277e6ee7adSKyungmin Park #endif /* _LINUX_CRC32_H */ 28