| /* |
| * Copyright (C) 2015-2017 Netronome Systems, Inc. |
| * |
| * This software is dual licensed under the GNU General License Version 2, |
| * June 1991 as shown in the file COPYING in the top-level directory of this |
| * source tree or the BSD 2-Clause License provided below. You have the |
| * option to license this software under the complete terms of either license. |
| * |
| * The BSD 2-Clause License: |
| * |
| * Redistribution and use in source and binary forms, with or |
| * without modification, are permitted provided that the following |
| * conditions are met: |
| * |
| * 1. Redistributions of source code must retain the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer in the documentation and/or other materials |
| * provided with the distribution. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
| * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
| * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| * SOFTWARE. |
| */ |
| |
| #ifndef NFP_CRC32_H |
| #define NFP_CRC32_H |
| |
| #include <linux/kernel.h> |
| #include <linux/crc32.h> |
| |
| /** |
| * crc32_posix_end() - Finalize POSIX CRC32 working state |
| * @crc: Current CRC32 working state |
| * @total_len: Total length of data that was CRC32'd |
| * |
| * Return: Final POSIX CRC32 value |
| */ |
| static inline u32 crc32_posix_end(u32 crc, size_t total_len) |
| { |
| /* Extend with the length of the string. */ |
| while (total_len != 0) { |
| u8 c = total_len & 0xff; |
| |
| crc = crc32_be(crc, &c, 1); |
| total_len >>= 8; |
| } |
| |
| return ~crc; |
| } |
| |
| static inline u32 crc32_posix(const void *buff, size_t len) |
| { |
| return crc32_posix_end(crc32_be(0, buff, len), len); |
| } |
| |
| #endif /* NFP_CRC32_H */ |