drivers/net/ice/base/ice_tmatch.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2001-2021 Intel Corporation
   3  */
   4
   5 #ifndef _ICE_TMATCH_H_
   6 #define _ICE_TMATCH_H_
   7
   8 static inline
   9 bool ice_ternary_match_byte(u8 key, u8 key_inv, u8 pat)
  10 {
  11         u8 k1, k2, v;
  12         int i;
  13
  14         for (i = 0; i < 8; i++) {
  15                 k1 = (u8)(key & (1 << i));
  16                 k2 = (u8)(key_inv & (1 << i));
  17                 v = (u8)(pat & (1 << i));
  18
  19                 if (k1 != 0 && k2 != 0)
  20                         continue;
  21                 if (k1 == 0 && k2 == 0)
  22                         return false;
  23
  24                 if (k1 == v)
  25                         return false;
  26         }
  27
  28         return true;
  29 }
  30
  31 static inline
  32 bool ice_ternary_match(const u8 *key, const u8 *key_inv,
  33                        const u8 *pat, int len)
  34 {
  35         int i;
  36
  37         for (i = 0; i < len; i++)
  38                 if (!ice_ternary_match_byte(key[i], key_inv[i], pat[i]))
  39                         return false;
  40
  41         return true;
  42 }
  43
  44 #endif /* _ICE_TMATCH_H_ */