240 lines
6.6 KiB
C
240 lines
6.6 KiB
C
/****************************************************************************
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* net/can/can_conn.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <string.h>
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#include <queue.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <arch/irq.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/semaphore.h>
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#include <nuttx/net/netconfig.h>
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#include <nuttx/net/net.h>
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#include "utils/utils.h"
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#include "can/can.h"
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#ifdef CONFIG_NET_CAN
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* The array containing all NetLink connections. */
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#ifndef CONFIG_NET_ALLOC_CONNS
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static struct can_conn_s g_can_connections[CONFIG_CAN_CONNS];
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#endif
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/* A list of all free NetLink connections */
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static dq_queue_t g_free_can_connections;
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static sem_t g_free_sem;
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/* A list of all allocated NetLink connections */
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static dq_queue_t g_active_can_connections;
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: _can_semtake() and _can_semgive()
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*
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* Description:
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* Take/give semaphore
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*
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****************************************************************************/
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static void _can_semtake(FAR sem_t *sem)
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{
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net_lockedwait_uninterruptible(sem);
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}
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static void _can_semgive(FAR sem_t *sem)
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{
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nxsem_post(sem);
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: can_initialize()
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*
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* Description:
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* Initialize the User Socket connection structures. Called once and only
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* from the networking layer.
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*
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****************************************************************************/
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void can_initialize(void)
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{
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#ifndef CONFIG_NET_ALLOC_CONNS
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int i;
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#endif
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/* Initialize the queues */
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dq_init(&g_free_can_connections);
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dq_init(&g_active_can_connections);
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nxsem_init(&g_free_sem, 0, 1);
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#ifndef CONFIG_NET_ALLOC_CONNS
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for (i = 0; i < CONFIG_CAN_CONNS; i++)
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{
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/* Mark the connection closed and move it to the free list */
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dq_addlast(&g_can_connections[i].sconn.node, &g_free_can_connections);
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}
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#endif
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}
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/****************************************************************************
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* Name: can_alloc()
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*
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* Description:
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* Allocate a new, uninitialized NetLink connection structure. This is
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* normally something done by the implementation of the socket() API
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*
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****************************************************************************/
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FAR struct can_conn_s *can_alloc(void)
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{
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FAR struct can_conn_s *conn;
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#ifdef CONFIG_NET_ALLOC_CONNS
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int i;
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#endif
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/* The free list is protected by a semaphore (that behaves like a mutex). */
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_can_semtake(&g_free_sem);
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#ifdef CONFIG_NET_ALLOC_CONNS
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if (dq_peek(&g_free_can_connections) == NULL)
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{
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conn = kmm_zalloc(sizeof(*conn) * CONFIG_CAN_CONNS);
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if (conn != NULL)
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{
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for (i = 0; i < CONFIG_CAN_CONNS; i++)
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{
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dq_addlast(&conn[i].sconn.node, &g_free_can_connections);
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}
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}
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}
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#endif
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conn = (FAR struct can_conn_s *)dq_remfirst(&g_free_can_connections);
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if (conn != NULL)
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{
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/* FIXME SocketCAN default behavior enables loopback */
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#ifdef CONFIG_NET_CANPROTO_OPTIONS
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/* By default the filter is configured to catch all,
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* this is done in commented filter code below:
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*
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* struct can_filter_t catchall_filter;
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* filter.can_id = 0;
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* filter.can_mask = 0;
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* conn->filters[0] = catchall_filter;
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*
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* However memset already sets the filter to 0
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* therefore we only have to set the filter count to 1
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*/
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conn->filter_count = 1;
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#endif
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/* Enqueue the connection into the active list */
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dq_addlast(&conn->sconn.node, &g_active_can_connections);
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}
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_can_semgive(&g_free_sem);
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return conn;
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}
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/****************************************************************************
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* Name: can_free()
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*
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* Description:
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* Free a NetLink connection structure that is no longer in use. This
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* should be done by the implementation of close().
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*
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****************************************************************************/
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void can_free(FAR struct can_conn_s *conn)
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{
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/* The free list is protected by a semaphore (that behaves like a mutex). */
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DEBUGASSERT(conn->crefs == 0);
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_can_semtake(&g_free_sem);
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/* Remove the connection from the active list */
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dq_rem(&conn->sconn.node, &g_active_can_connections);
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/* Reset structure */
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memset(conn, 0, sizeof(*conn));
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/* Free the connection */
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dq_addlast(&conn->sconn.node, &g_free_can_connections);
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_can_semgive(&g_free_sem);
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}
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/****************************************************************************
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* Name: can_nextconn()
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*
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* Description:
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* Traverse the list of allocated NetLink connections
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*
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* Assumptions:
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* This function is called from NetLink device logic.
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*
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****************************************************************************/
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FAR struct can_conn_s *can_nextconn(FAR struct can_conn_s *conn)
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{
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if (conn == NULL)
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{
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return (FAR struct can_conn_s *)g_active_can_connections.head;
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}
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else
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{
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return (FAR struct can_conn_s *)conn->sconn.node.flink;
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}
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}
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#endif /* CONFIG_NET_CAN */
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