lib/librte_table/rte_lru.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2014 Intel Corporation
   3  */
   4
   5 #ifndef __INCLUDE_RTE_LRU_H__
   6 #define __INCLUDE_RTE_LRU_H__
   7
   8 #ifdef __cplusplus
   9 extern "C" {
  10 #endif
  11
  12 #include <rte_config.h>
  13 #ifdef RTE_ARCH_X86_64
  14 #include "rte_lru_x86.h"
  15 #elif defined(RTE_ARCH_ARM64)
  16 #include "rte_lru_arm64.h"
  17 #else
  18 #undef RTE_TABLE_HASH_LRU_STRATEGY
  19 #define RTE_TABLE_HASH_LRU_STRATEGY                        1
  20 #endif
  21
  22 #if RTE_TABLE_HASH_LRU_STRATEGY == 0
  23
  24 #define lru_init(bucket)                                                \
  25 do                                                                      \
  26         bucket = bucket;                                                \
  27 while (0)
  28
  29 #define lru_pos(bucket) (bucket->lru_list & 0xFFFFLLU)
  30
  31 #define lru_update(bucket, mru_val)                                     \
  32 do {                                                                    \
  33         bucket = bucket;                                                \
  34         mru_val = mru_val;                                              \
  35 } while (0)
  36
  37 #elif RTE_TABLE_HASH_LRU_STRATEGY == 1
  38
  39 #define lru_init(bucket)                                                \
  40 do                                                                      \
  41         bucket->lru_list = 0x0000000100020003LLU;                       \
  42 while (0)
  43
  44 #define lru_pos(bucket) (bucket->lru_list & 0xFFFFLLU)
  45
  46 #define lru_update(bucket, mru_val)                                     \
  47 do {                                                                    \
  48         uint64_t x, pos, x0, x1, x2, mask;                              \
  49                                                                         \
  50         x = bucket->lru_list;                                           \
  51                                                                         \
  52         pos = 4;                                                        \
  53         if ((x >> 48) == ((uint64_t) mru_val))                          \
  54                 pos = 3;                                                \
  55                                                                         \
  56         if (((x >> 32) & 0xFFFFLLU) == ((uint64_t) mru_val))            \
  57                 pos = 2;                                                \
  58                                                                         \
  59         if (((x >> 16) & 0xFFFFLLU) == ((uint64_t) mru_val))            \
  60                 pos = 1;                                                \
  61                                                                         \
  62         if ((x & 0xFFFFLLU) == ((uint64_t) mru_val))                    \
  63                 pos = 0;                                                \
  64                                                                         \
  65                                                                         \
  66         pos <<= 4;                                                      \
  67         mask = (~0LLU) << pos;                                          \
  68         x0 = x & (~mask);                                               \
  69         x1 = (x >> 16) & mask;                                          \
  70         x2 = (x << (48 - pos)) & (0xFFFFLLU << 48);                     \
  71         x = x0 | x1 | x2;                                               \
  72                                                                         \
  73         if (pos != 64)                                                  \
  74                 bucket->lru_list = x;                                   \
  75 } while (0)
  76
  77 #elif (RTE_TABLE_HASH_LRU_STRATEGY == 2) || (RTE_TABLE_HASH_LRU_STRATEGY == 3)
  78
  79 /**
  80  * These strategies are implemented in architecture specific header files.
  81  */
  82
  83 #else
  84
  85 #error "Incorrect value for RTE_TABLE_HASH_LRU_STRATEGY"
  86
  87 #endif
  88
  89 #ifdef __cplusplus
  90 }
  91 #endif
  92
  93 #endif