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/*
* Copyright (c) 2021-2022 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.c
* @brief Implementation of hICN packet pool.
*/
#include <hicn/util/pool.h>
#include <hicn/util/log.h>
#include "msgbuf_pool.h"
msgbuf_pool_t *_msgbuf_pool_create(size_t init_size, size_t max_size) {
msgbuf_pool_t *msgbuf_pool = malloc(sizeof(msgbuf_pool_t));
if (init_size == 0) init_size = PACKET_POOL_DEFAULT_INIT_SIZE;
pool_init(msgbuf_pool->buffers, init_size, 0);
return msgbuf_pool;
}
void msgbuf_pool_free(msgbuf_pool_t *msgbuf_pool) {
pool_free(msgbuf_pool->buffers);
free(msgbuf_pool);
}
off_t msgbuf_pool_get(msgbuf_pool_t *msgbuf_pool, msgbuf_t **msgbuf) {
off_t id = pool_get(msgbuf_pool->buffers, *msgbuf);
(*msgbuf)->refs = 0;
return id;
}
void msgbuf_pool_put(msgbuf_pool_t *msgbuf_pool, msgbuf_t *msgbuf) {
pool_put(msgbuf_pool->buffers, msgbuf);
}
int msgbuf_pool_getn(msgbuf_pool_t *msgbuf_pool, msgbuf_t **msgbuf, size_t n) {
// CAVEAT: Resize at the beginning otherwise the resize can be
// triggered by an intermediate msgbuf_pool_put, making the
// buffers previously retrieved invalid
uint64_t remaining_pool_space =
pool_get_free_indices_size(msgbuf_pool->buffers);
while (remaining_pool_space < n) {
_pool_resize((void **)&(msgbuf_pool->buffers), sizeof(msgbuf_t));
remaining_pool_space = pool_get_free_indices_size(msgbuf_pool->buffers);
}
for (unsigned i = 0; i < n; i++) {
// If not able to get the msgbuf
if (msgbuf_pool_get(msgbuf_pool, &msgbuf[i]) < 0) {
// Release all the msgbufs retrieved so far
for (unsigned j = 0; j < i; j++) {
msgbuf_pool_put(msgbuf_pool, msgbuf[j]);
}
return -1;
}
}
return 0;
}
off_t msgbuf_pool_get_id(msgbuf_pool_t *msgbuf_pool, msgbuf_t *msgbuf) {
return msgbuf - msgbuf_pool->buffers;
}
msgbuf_t *msgbuf_pool_at(const msgbuf_pool_t *msgbuf_pool, off_t id) {
assert(msgbuf_id_is_valid(id));
return msgbuf_pool->buffers + id;
}
void msgbuf_pool_acquire(msgbuf_t *msgbuf) { msgbuf->refs++; };
void msgbuf_pool_release(msgbuf_pool_t *msgbuf_pool, msgbuf_t **msgbuf_ptr) {
msgbuf_t *msgbuf = *msgbuf_ptr;
assert(msgbuf->refs > 0);
msgbuf->refs--;
if (msgbuf->refs == 0) {
WITH_TRACE({
off_t msgbuf_id = msgbuf_pool_get_id(msgbuf_pool, msgbuf);
if (msgbuf_get_type(msgbuf) != HICN_PACKET_TYPE_INTEREST &&
msgbuf_get_type(msgbuf) != HICN_PACKET_TYPE_DATA) {
TRACE("Msgbuf %d (%p) - put to msgbuf pool", msgbuf_id, msgbuf);
} else {
char buf[MAXSZ_HICN_NAME];
int rc =
hicn_name_snprintf(buf, MAXSZ_HICN_NAME, msgbuf_get_name(msgbuf));
if (rc < 0 || rc >= MAXSZ_HICN_NAME)
snprintf(buf, MAXSZ_HICN_NAME, "%s", "(error)");
const char *msgbuf_type_str =
msgbuf_get_type(msgbuf) == HICN_PACKET_TYPE_INTEREST ? "interest"
: "data";
TRACE("Msgbuf %d (%p) - %s (%s) put to msgbuf pool", msgbuf_id, msgbuf,
buf, msgbuf_type_str);
}
})
msgbuf_pool_put(msgbuf_pool, msgbuf);
*msgbuf_ptr = NULL;
}
};
off_t msgbuf_pool_clone(msgbuf_pool_t *msgbuf_pool, msgbuf_t **new_msgbuf,
off_t orginal_msg_id) {
msgbuf_t *original_msgbuf = msgbuf_pool_at(msgbuf_pool, orginal_msg_id);
off_t offset = pool_get(msgbuf_pool->buffers, *new_msgbuf);
memcpy(*new_msgbuf, original_msgbuf, sizeof(msgbuf_t));
(*new_msgbuf)->refs = 0;
return offset;
}
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