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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 __HICN_CS_POLICY_H__
#define __HICN_CS_POLICY_H__
#include "../hashtb.h"
/**
* @file cs_policy.h
*
* This file provides the needed structures to implement a CS policy
*/
/*
* Structure
*/
typedef struct hicn_cs_policy_s
{
u32 max;
u32 count;
/* Indexes to hashtable nodes forming CS LRU */
u32 head;
u32 tail;
} hicn_cs_policy_t;
/* Forward declaration */
struct hicn_pit_cs_s;
struct hicn_hash_node_s;
struct hicn_pcs_entry_s;
struct hicn_cs_policy_s;
/**
* @brief Definition of the virtual functin table for a cache policy.
*
* A cache policy must implement all the following functions:
* - insert: add a new element
* - update: update the position of an existing element
* - dequeue: remove an element from the list
* - delete_get: return the next element that should be removed trim
* - flush: clean the cs
*/
typedef struct hicn_cs_policy_vft_s
{
void (*hicn_cs_insert) (struct hicn_pit_cs_s *p,
struct hicn_hash_node_s *node,
struct hicn_pcs_entry_s *pcs,
hicn_cs_policy_t *policy);
void (*hicn_cs_update) (struct hicn_pit_cs_s *p,
struct hicn_hash_node_s *node,
struct hicn_pcs_entry_s *pcs,
hicn_cs_policy_t *policy);
void (*hicn_cs_dequeue) (struct hicn_pit_cs_s *p,
struct hicn_hash_node_s *node,
struct hicn_pcs_entry_s *pcs,
hicn_cs_policy_t *policy);
void (*hicn_cs_delete_get) (struct hicn_pit_cs_s *p,
hicn_cs_policy_t *policy,
struct hicn_hash_node_s **node,
struct hicn_pcs_entry_s **pcs,
struct hicn_hash_entry_s **hash_entry);
int (*hicn_cs_trim) (struct hicn_pit_cs_s *p, u32 *node_list, int sz,
hicn_cs_policy_t *policy);
int (*hicn_cs_flush) (vlib_main_t *vm, struct hicn_pit_cs_s *p,
hicn_cs_policy_t *policy_state);
} hicn_cs_policy_vft_t;
#endif /* // __HICN_POLICY_H__ */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables: eval: (c-set-style "gnu") End:
*/
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