lib/librte_table/rte_lru.h

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
   5  *   All rights reserved.
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   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
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  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
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  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #ifndef __INCLUDE_RTE_LRU_H__
  35 #define __INCLUDE_RTE_LRU_H__
  36
  37 #ifdef __cplusplus
  38 extern "C" {
  39 #endif
  40
  41 #ifdef RTE_ARCH_X86_64
  42 #include "rte_lru_x86.h"
  43 #elif defined(RTE_ARCH_ARM64)
  44 #include "rte_lru_arm64.h"
  45 #else
  46 #undef RTE_TABLE_HASH_LRU_STRATEGY
  47 #define RTE_TABLE_HASH_LRU_STRATEGY                        1
  48 #endif
  49
  50 #if RTE_TABLE_HASH_LRU_STRATEGY == 0
  51
  52 #define lru_init(bucket)                                                \
  53 do                                                                      \
  54         bucket = bucket;                                                \
  55 while (0)
  56
  57 #define lru_pos(bucket) (bucket->lru_list & 0xFFFFLLU)
  58
  59 #define lru_update(bucket, mru_val)                                     \
  60 do {                                                                    \
  61         bucket = bucket;                                                \
  62         mru_val = mru_val;                                              \
  63 } while (0)
  64
  65 #elif RTE_TABLE_HASH_LRU_STRATEGY == 1
  66
  67 #define lru_init(bucket)                                                \
  68 do                                                                      \
  69         bucket->lru_list = 0x0000000100020003LLU;                       \
  70 while (0)
  71
  72 #define lru_pos(bucket) (bucket->lru_list & 0xFFFFLLU)
  73
  74 #define lru_update(bucket, mru_val)                                     \
  75 do {                                                                    \
  76         uint64_t x, pos, x0, x1, x2, mask;                              \
  77                                                                         \
  78         x = bucket->lru_list;                                           \
  79                                                                         \
  80         pos = 4;                                                        \
  81         if ((x >> 48) == ((uint64_t) mru_val))                          \
  82                 pos = 3;                                                \
  83                                                                         \
  84         if (((x >> 32) & 0xFFFFLLU) == ((uint64_t) mru_val))            \
  85                 pos = 2;                                                \
  86                                                                         \
  87         if (((x >> 16) & 0xFFFFLLU) == ((uint64_t) mru_val))            \
  88                 pos = 1;                                                \
  89                                                                         \
  90         if ((x & 0xFFFFLLU) == ((uint64_t) mru_val))                    \
  91                 pos = 0;                                                \
  92                                                                         \
  93                                                                         \
  94         pos <<= 4;                                                      \
  95         mask = (~0LLU) << pos;                                          \
  96         x0 = x & (~mask);                                               \
  97         x1 = (x >> 16) & mask;                                          \
  98         x2 = (x << (48 - pos)) & (0xFFFFLLU << 48);                     \
  99         x = x0 | x1 | x2;                                               \
 100                                                                         \
 101         if (pos != 64)                                                  \
 102                 bucket->lru_list = x;                                   \
 103 } while (0)
 104
 105 #elif (RTE_TABLE_HASH_LRU_STRATEGY == 2) || (RTE_TABLE_HASH_LRU_STRATEGY == 3)
 106
 107 /**
 108  * These strategies are implemented in architecture specific header files.
 109  */
 110
 111 #else
 112
 113 #error "Incorrect value for RTE_TABLE_HASH_LRU_STRATEGY"
 114
 115 #endif
 116
 117 #ifdef __cplusplus
 118 }
 119 #endif
 120
 121 #endif