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__

#ifdef __cplusplus
extern "C" {
#endif

#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

#ifdef __cplusplus
}
#endif

#endif