/usr/include/dpdk/rte_lru.h is in libdpdk-dev 17.11.1-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* BSD LICENSE
*
* Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#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)
/**
* These strategies are implemented in architecture specific header files.
*/
#else
#error "Incorrect value for RTE_TABLE_HASH_LRU_STRATEGY"
#endif
#ifdef __cplusplus
}
#endif
#endif
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