* net/can/can_bufpool.c
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you 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.
*
****************************************************************************/
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <debug.h>
#include <nuttx/mm/mempool.h>
#include <nuttx/net/can.h>
#include "utils/utils.h"
* Pre-processor Definitions
****************************************************************************/
#define CAN_BUFFER_SIZE ALIGN_UP(ALIGN_UP(sizeof(struct iob_s), \
IOB_ALIGNMENT) + NET_CAN_PKTSIZE + \
CONFIG_NET_LL_GUARDSIZE, IOB_ALIGNMENT)
* Private Data
****************************************************************************/
MEMPOOL_DEFINE(g_can_buffer, CAN_BUFFER_SIZE, CONFIG_NET_CAN_NBUFFERS, 0, 0);
* Private Functions
****************************************************************************/
* Name: can_buf_free
*
* Description:
* Free the CAN buffer to the buffer pool
*
* Input Parameters:
* data - The CAN buffer to be freed
*
****************************************************************************/
static void can_buf_free(FAR void *buf)
{
mempool_release(&g_can_buffer, buf);
}
* Public Functions
****************************************************************************/
* Name: can_iob_timedalloc
*
* Description:
* Allocate an CAN I/O buffer from the CAN buffer pool.
*
****************************************************************************/
FAR struct iob_s *can_iob_timedalloc(unsigned int timeout)
{
FAR void *buf = mempool_zallocate(&g_can_buffer, timeout);
if (buf == NULL)
{
nwarn("Failed to allocate CAN buffer\n");
return NULL;
}
return iob_init_with_data(buf, CAN_BUFFER_SIZE, can_buf_free);
}
* Name: can_iob_clone
*
* Description:
* Clone an I/O buffer from the CAN buffer pool.
*
****************************************************************************/
FAR struct iob_s *can_iob_clone(FAR struct net_driver_s *dev)
{
FAR struct iob_s *iob;
iob = can_iob_timedalloc(0);
if (iob == NULL)
{
return NULL;
}
iob_reserve(iob, CONFIG_NET_LL_GUARDSIZE);
* data, we don't have to worry about distributing other iob.
*/
iob_clone_partial(dev->d_iob, dev->d_iob->io_pktlen, 0, iob, 0,
false, false);
return iob;
}
* Name: can_iob_navail
*
* Description:
* Return the number of available CAN I/O buffers.
*
****************************************************************************/
int can_iob_navail(void)
{
return mempool_navail(&g_can_buffer);
}