rte_lru.h

/*-
 *   BSD LICENSE
 *
 *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
 *   All rights reserved.
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 *   modification, are permitted provided that the following conditions
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 *
 *     * 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.
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 *       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
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 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 *   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

#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