From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001 From: Yuval Adam <_@yuv.al> Date: Wed, 30 Aug 2017 08:25:59 +0000 Subject: Initial file dump from open source release --- include/linux/crc32.h | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 include/linux/crc32.h (limited to 'include/linux/crc32.h') diff --git a/include/linux/crc32.h b/include/linux/crc32.h new file mode 100644 index 00000000..68267b64 --- /dev/null +++ b/include/linux/crc32.h @@ -0,0 +1,29 @@ +/* + * crc32.h + * See linux/lib/crc32.c for license and changes + */ +#ifndef _LINUX_CRC32_H +#define _LINUX_CRC32_H + +#include +#include + +extern u32 crc32_le(u32 crc, unsigned char const *p, size_t len); +extern u32 crc32_be(u32 crc, unsigned char const *p, size_t len); + +extern u32 __crc32c_le(u32 crc, unsigned char const *p, size_t len); + +#define crc32(seed, data, length) crc32_le(seed, (unsigned char const *)(data), length) + +/* + * Helpers for hash table generation of ethernet nics: + * + * Ethernet sends the least significant bit of a byte first, thus crc32_le + * is used. The output of crc32_le is bit reversed [most significant bit + * is in bit nr 0], thus it must be reversed before use. Except for + * nics that bit swap the result internally... + */ +#define ether_crc(length, data) bitrev32(crc32_le(~0, data, length)) +#define ether_crc_le(length, data) crc32_le(~0, data, length) + +#endif /* _LINUX_CRC32_H */ -- cgit v1.3.1