ceph/src/spdk/dpdk/drivers/net/nfp/nfpcore/nfp_crc.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2018 Netronome Systems, Inc.
   3  * All rights reserved.
   4  */
   5
   6 #include <stdio.h>
   7 #include <inttypes.h>
   8
   9 #include "nfp_crc.h"
  10
  11 static inline uint32_t
  12 nfp_crc32_be_generic(uint32_t crc, unsigned char const *p, size_t len,
  13                  uint32_t polynomial)
  14 {
  15         int i;
  16         while (len--) {
  17                 crc ^= *p++ << 24;
  18                 for (i = 0; i < 8; i++)
  19                         crc = (crc << 1) ^ ((crc & 0x80000000) ? polynomial :
  20                                           0);
  21         }
  22         return crc;
  23 }
  24
  25 static inline uint32_t
  26 nfp_crc32_be(uint32_t crc, unsigned char const *p, size_t len)
  27 {
  28         return nfp_crc32_be_generic(crc, p, len, CRCPOLY_BE);
  29 }
  30
  31 static uint32_t
  32 nfp_crc32_posix_end(uint32_t crc, size_t total_len)
  33 {
  34         /* Extend with the length of the string. */
  35         while (total_len != 0) {
  36                 uint8_t c = total_len & 0xff;
  37
  38                 crc = nfp_crc32_be(crc, &c, 1);
  39                 total_len >>= 8;
  40         }
  41
  42         return ~crc;
  43 }
  44
  45 uint32_t
  46 nfp_crc32_posix(const void *buff, size_t len)
  47 {
  48         return nfp_crc32_posix_end(nfp_crc32_be(0, buff, len), len);
  49 }