rte_lru_lsx.h

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2010-2014 Intel Corporation
 */
 
#ifndef __INCLUDE_RTE_LRU_LOONGARCH_H__
#define __INCLUDE_RTE_LRU_LOONGARCH_H__
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <stdint.h>
 
#include <rte_config.h>
#include <rte_vect.h>
 
#ifndef RTE_TABLE_HASH_LRU_STRATEGY
#define RTE_TABLE_HASH_LRU_STRATEGY                        3
#endif
 
#if RTE_TABLE_HASH_LRU_STRATEGY == 3
 
#define lru_init(bucket)                        \
    { bucket->lru_list = ~0LLU; }
 
static inline int
f_lru_pos(uint64_t lru_list)
{
    xmm_t lst = (xmm_t) {.i64 = { lru_list, (uint64_t)-1} };
    uint16_t min_val, i, j = 0;
 
    min_val = lst.u16[0];
    for (i = 0; i < 8; i++) {
        if (min_val > lst.u16[i]) {
            min_val = lst.u16[i];
            j = i;
        }
    }
 
    return j;
}
#define lru_pos(bucket) f_lru_pos(bucket->lru_list)
 
#define lru_update(bucket, mru_val)                 \
do {                                    \
    const uint64_t orvals[] = {0xFFFFLLU, 0xFFFFLLU << 16,      \
        0xFFFFLLU << 32, 0xFFFFLLU << 48, 0LLU};        \
    const uint64_t decs[] = {0x1000100010001LLU, 0};        \
    __m128i v_zeros = __lsx_vldi(0);                \
    __m128i lru = v_zeros, vdec = v_zeros;              \
    lru = __lsx_vinsgr2vr_d(lru, bucket->lru_list, 0);      \
    vdec = __lsx_vinsgr2vr_d(vdec, decs[mru_val>>2], 0);        \
    lru = __lsx_vsub_h(lru, vdec);                  \
    bucket->lru_list = __lsx_vpickve2gr_d(lru, 0);          \
    bucket->lru_list |= orvals[mru_val];                \
} while (0)
#endif
 
#ifdef __cplusplus
}
#endif
 
#endif