rte_lru.h

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2010-2014 Intel Corporation
 */

#ifndef __INCLUDE_RTE_LRU_H__
#define __INCLUDE_RTE_LRU_H__

#include <rte_config.h>
#ifdef RTE_ARCH_X86_64
#include "rte_lru_x86.h"
#elif defined(RTE_ARCH_ARM64)
#include "rte_lru_arm64.h"
#else
#undef RTE_TABLE_HASH_LRU_STRATEGY
#define RTE_TABLE_HASH_LRU_STRATEGY                        1
#endif

#if RTE_TABLE_HASH_LRU_STRATEGY == 0

#define lru_init(bucket)                        \
do                                  \
    bucket = bucket;                        \
while (0)

#define lru_pos(bucket) (bucket->lru_list & 0xFFFFLLU)

#define lru_update(bucket, mru_val)                 \
do {                                    \
    bucket = bucket;                        \
    mru_val = mru_val;                      \
} while (0)

#elif RTE_TABLE_HASH_LRU_STRATEGY == 1

#define lru_init(bucket)                        \
do                                  \
    bucket->lru_list = 0x0000000100020003LLU;           \
while (0)

#define lru_pos(bucket) (bucket->lru_list & 0xFFFFLLU)

#define lru_update(bucket, mru_val)                 \
do {                                    \
    uint64_t _x, _pos, _x0, _x1, _x2, _mask;            \
                                    \
    _x = bucket->lru_list;                      \
                                    \
    _pos = 4;                           \
    if ((_x >> 48) == ((uint64_t) mru_val))         \
        _pos = 3;                       \
                                    \
    if (((_x >> 32) & 0xFFFFLLU) == ((uint64_t) mru_val))       \
        _pos = 2;                       \
                                    \
    if (((_x >> 16) & 0xFFFFLLU) == ((uint64_t) mru_val))       \
        _pos = 1;                       \
                                    \
    if ((_x & 0xFFFFLLU) == ((uint64_t) mru_val))           \
        _pos = 0;                       \
                                    \
                                    \
    _pos <<= 4;                         \
    _mask = (~0LLU) << _pos;                    \
    _x0 = _x & (~_mask);                        \
    _x1 = (_x >> 16) & _mask;                   \
    _x2 = (_x << (48 - _pos)) & (0xFFFFLLU << 48);          \
    _x = _x0 | _x1 | _x2;                       \
                                    \
    if (_pos != 64)                         \
        bucket->lru_list = _x;                  \
} while (0)

#elif (RTE_TABLE_HASH_LRU_STRATEGY == 2) || (RTE_TABLE_HASH_LRU_STRATEGY == 3)

#else

#error "Incorrect value for RTE_TABLE_HASH_LRU_STRATEGY"

#endif

#endif