drivers/net/ethernet/netronome/nfp/nfpcore/crc32.h

   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 */