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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   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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  19  *       from this software without specific prior written permission.
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  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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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,
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  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 #include <rte_config.h>
  42 #ifdef RTE_ARCH_X86_64
  43 #include "rte_lru_x86.h"
  44 #elif defined(RTE_ARCH_ARM64)
  45 #include "rte_lru_arm64.h"
  46 #else
  47 #undef RTE_TABLE_HASH_LRU_STRATEGY
  48 #define RTE_TABLE_HASH_LRU_STRATEGY                        1
  49 #endif
  50
  51 #if RTE_TABLE_HASH_LRU_STRATEGY == 0
  52
  53 #define lru_init(bucket)                                                \
  54 do                                                                      \
  55         bucket = bucket;                                                \
  56 while (0)
  57
  58 #define lru_pos(bucket) (bucket->lru_list & 0xFFFFLLU)
  59
  60 #define lru_update(bucket, mru_val)                                     \
  61 do {                                                                    \
  62         bucket = bucket;                                                \
  63         mru_val = mru_val;                                              \
  64 } while (0)
  65
  66 #elif RTE_TABLE_HASH_LRU_STRATEGY == 1
  67
  68 #define lru_init(bucket)                                                \
  69 do                                                                      \
  70         bucket->lru_list = 0x0000000100020003LLU;                       \
  71 while (0)
  72
  73 #define lru_pos(bucket) (bucket->lru_list & 0xFFFFLLU)
  74
  75 #define lru_update(bucket, mru_val)                                     \
  76 do {                                                                    \
  77         uint64_t x, pos, x0, x1, x2, mask;                              \
  78                                                                         \
  79         x = bucket->lru_list;                                           \
  80                                                                         \
  81         pos = 4;                                                        \
  82         if ((x >> 48) == ((uint64_t) mru_val))                          \
  83                 pos = 3;                                                \
  84                                                                         \
  85         if (((x >> 32) & 0xFFFFLLU) == ((uint64_t) mru_val))            \
  86                 pos = 2;                                                \
  87                                                                         \
  88         if (((x >> 16) & 0xFFFFLLU) == ((uint64_t) mru_val))            \
  89                 pos = 1;                                                \
  90                                                                         \
  91         if ((x & 0xFFFFLLU) == ((uint64_t) mru_val))                    \
  92                 pos = 0;                                                \
  93                                                                         \
  94                                                                         \
  95         pos <<= 4;                                                      \
  96         mask = (~0LLU) << pos;                                          \
  97         x0 = x & (~mask);                                               \
  98         x1 = (x >> 16) & mask;                                          \
  99         x2 = (x << (48 - pos)) & (0xFFFFLLU << 48);                     \
 100         x = x0 | x1 | x2;                                               \
 101                                                                         \
 102         if (pos != 64)                                                  \
 103                 bucket->lru_list = x;                                   \
 104 } while (0)
 105
 106 #elif (RTE_TABLE_HASH_LRU_STRATEGY == 2) || (RTE_TABLE_HASH_LRU_STRATEGY == 3)
 107
 108 /**
 109  * These strategies are implemented in architecture specific header files.
 110  */
 111
 112 #else
 113
 114 #error "Incorrect value for RTE_TABLE_HASH_LRU_STRATEGY"
 115
 116 #endif
 117
 118 #ifdef __cplusplus
 119 }
 120 #endif
 121
 122 #endif