lib/librte_table/rte_lru.h

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
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   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
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  15  *       the documentation and/or other materials provided with the
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  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 #else
  44 #undef RTE_TABLE_HASH_LRU_STRATEGY
  45 #define RTE_TABLE_HASH_LRU_STRATEGY                        1
  46 #endif
  47
  48 #if RTE_TABLE_HASH_LRU_STRATEGY == 0
  49
  50 #define lru_init(bucket)                                                \
  51 do                                                                      \
  52         bucket = bucket;                                                \
  53 while (0)
  54
  55 #define lru_pos(bucket) (bucket->lru_list & 0xFFFFLLU)
  56
  57 #define lru_update(bucket, mru_val)                                     \
  58 do {                                                                    \
  59         bucket = bucket;                                                \
  60         mru_val = mru_val;                                              \
  61 } while (0)
  62
  63 #elif RTE_TABLE_HASH_LRU_STRATEGY == 1
  64
  65 #define lru_init(bucket)                                                \
  66 do                                                                      \
  67         bucket->lru_list = 0x0000000100020003LLU;                       \
  68 while (0)
  69
  70 #define lru_pos(bucket) (bucket->lru_list & 0xFFFFLLU)
  71
  72 #define lru_update(bucket, mru_val)                                     \
  73 do {                                                                    \
  74         uint64_t x, pos, x0, x1, x2, mask;                              \
  75                                                                         \
  76         x = bucket->lru_list;                                           \
  77                                                                         \
  78         pos = 4;                                                        \
  79         if ((x >> 48) == ((uint64_t) mru_val))                          \
  80                 pos = 3;                                                \
  81                                                                         \
  82         if (((x >> 32) & 0xFFFFLLU) == ((uint64_t) mru_val))            \
  83                 pos = 2;                                                \
  84                                                                         \
  85         if (((x >> 16) & 0xFFFFLLU) == ((uint64_t) mru_val))            \
  86                 pos = 1;                                                \
  87                                                                         \
  88         if ((x & 0xFFFFLLU) == ((uint64_t) mru_val))                    \
  89                 pos = 0;                                                \
  90                                                                         \
  91                                                                         \
  92         pos <<= 4;                                                      \
  93         mask = (~0LLU) << pos;                                          \
  94         x0 = x & (~mask);                                               \
  95         x1 = (x >> 16) & mask;                                          \
  96         x2 = (x << (48 - pos)) & (0xFFFFLLU << 48);                     \
  97         x = x0 | x1 | x2;                                               \
  98                                                                         \
  99         if (pos != 64)                                                  \
 100                 bucket->lru_list = x;                                   \
 101 } while (0)
 102
 103 #elif (RTE_TABLE_HASH_LRU_STRATEGY == 2) || (RTE_TABLE_HASH_LRU_STRATEGY == 3)
 104
 105 /**
 106  * These strategies are implemented in architecture specific header files.
 107  */
 108
 109 #else
 110
 111 #error "Incorrect value for RTE_TABLE_HASH_LRU_STRATEGY"
 112
 113 #endif
 114
 115 #ifdef __cplusplus
 116 }
 117 #endif
 118
 119 #endif