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/*
* Copyright (c) 2021 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __LRU_H__
#define __LRU_H__
#include "../pcs.h"
#include "cs_policy.h"
/**
* @file cs_lru.h
*
* This file implements the LRU policy for the CS
*/
extern hicn_cs_policy_vft_t hicn_cs_lru;
/**
* @brief Insert a new CS element at the head of the CS LRU
*
* @param policy the cs insertion/eviction policy - LRU
* @param pcs the PCS table
* @param pcs_entry the PCS entry to insert
* @return 0 on success, -1 on overflow
*/
void hicn_cs_lru_insert (hicn_cs_policy_t *policy, hicn_pit_cs_t *pcs,
hicn_pcs_entry_t *pcs_entry);
/*
* Dequeue an LRU element, for example when it has expired.
*/
void hicn_cs_lru_dequeue (hicn_cs_policy_t *policy, hicn_pit_cs_t *pcs,
hicn_pcs_entry_t *pcs_entry);
/*
* Move a CS LRU element to the head, probably after it's been used.
*/
void hicn_cs_lru_update_head (hicn_cs_policy_t *lru, hicn_pit_cs_t *pcs,
hicn_pcs_entry_t *entry);
void hicn_cs_lru_delete_get (hicn_cs_policy_t *policy,
const hicn_pit_cs_t *pcs,
hicn_pcs_entry_t **pcs_entry);
/*
* Remove a batch of nodes from the CS LRU, copying their node indexes into
* the caller's array. We expect this is done when the LRU size exceeds the
* CS's limit. Return the number of removed nodes.
*/
int hicn_cs_lru_trim (hicn_cs_policy_t *policy, hicn_pit_cs_t *pcs,
u32 *node_list, size_t sz);
int hicn_cs_lru_flush (hicn_cs_policy_t *policy, hicn_pit_cs_t *pcs);
hicn_cs_policy_t hicn_cs_lru_create (u32 max_elts);
#endif /* __LRU_H__ */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables: eval: (c-set-style "gnu") End:
*/
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