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/*
* Copyright (c) 2020 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.
*/
/**
* @file msgbuf_pool.h
* @brief hICN msgbuf pool.
*
* THe msgbuf pool is used to store packet payloads while the packets are in
* transit, as well as holding them into the packet cache (PIT, CSS), WLDR,
* mapme, etc.
*
* Control packets might receive a special treatment in that they are eventually
* transformed into a ack/nack, but this should not affect any part of this
* design.
*
* Do we need a reference count, or simply a lock ?
* What about weak references ?
* We need to be sure that a pool element is never referenced ever again after
* it is deleted from the pool as its ID might be reaffected.
*
* It might even be better to store references to msgbuf's as they might hold
* additional information of interest about the packet... a bit like a skbuff in
* linux. Is this relevant for the packet cache ?
*/
#ifndef HICNLIGHT_MSGBUF_POOL_H
#define HICNLIGHT_MSGBUF_POOL_H
#include "msgbuf.h"
#define MTU 1500
typedef struct {
msgbuf_t * buffers;
} msgbuf_pool_t;
// 0 for init size means a default value (of 1024)
// 0 for max_size means no limit
msgbuf_pool_t * _msgbuf_pool_create(size_t init_size, size_t max_size);
#define msgbuf_pool_create() _msgbuf_pool_create(0, 0)
void msgbuf_pool_free(msgbuf_pool_t * msgbuf_pool);
int msgbuf_pool_get(msgbuf_pool_t * msgbuf_pool, msgbuf_t * msgbuf);
int msgbuf_pool_getn(msgbuf_pool_t * msgbuf_pool, msgbuf_t ** msgbuf, size_t n);
off_t msgbuf_pool_get_id(msgbuf_pool_t * msgbuf_pool, msgbuf_t * msgbuf);
msgbuf_t * msgbuf_pool_at(const msgbuf_pool_t * msgbuf_pool, off_t id);
#endif /* HICNLIGHT_MSGBUF_POOL_H */
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