285 lines
8.7 KiB
C
285 lines
8.7 KiB
C
/****************************************************************************
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* net/bluetooth/bluetooth_input.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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* Handle incoming Bluetooth frame input
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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 <string.h>
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#include <assert.h>
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#include <debug.h>
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#include <nuttx/mm/iob.h>
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#include <nuttx/net/radiodev.h>
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#include <nuttx/net/bluetooth.h>
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#include <nuttx/wireless/bluetooth/bt_hci.h>
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#include "devif/devif.h"
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#include "bluetooth/bluetooth.h"
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#ifdef CONFIG_NET_BLUETOOTH
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: bluetooth_count_frames
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*
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* Description:
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* Return the number of frames in the RX queue.
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*
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* Input Parameters:
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* conn - The socket connection structure.
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*
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* Returned Value:
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* The number of frames in the queue.
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*
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****************************************************************************/
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#if CONFIG_NET_BLUETOOTH_BACKLOG > 0
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static int bluetooth_count_frames(FAR struct bluetooth_conn_s *conn)
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{
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FAR struct bluetooth_container_s *container;
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int count;
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for (count = 0, container = conn->bc_rxhead;
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container != NULL;
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count++, container = container->bn_flink)
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{
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}
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return count;
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}
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#endif
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/****************************************************************************
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* Name: bluetooth_queue_frame
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*
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* Description:
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* Add one frame to the connection's RX queue.
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*
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* Input Parameters:
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* conn - The socket connection structure.
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* framel - A single frame to add to the RX queue.
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* meta - Meta data characterizing the received frame.
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*
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* Returned Value:
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* Zero (OK) is returned on success; A negated errno value is returned on
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* any failure.
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*
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****************************************************************************/
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static int bluetooth_queue_frame(FAR struct bluetooth_conn_s *conn,
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FAR struct iob_s *frame,
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FAR struct bluetooth_frame_meta_s *meta)
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{
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FAR struct bluetooth_container_s *container;
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/* Allocate a container for the frame */
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container = bluetooth_container_allocate();
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if (container == NULL)
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{
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nerr("ERROR: Failed to allocate a container\n");
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return -ENOMEM;
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}
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/* Initialize the container */
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memset(&container->bn_raddr, 0, sizeof(bt_addr_t));
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container->bn_channel = meta->bm_channel;
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BLUETOOTH_ADDRCOPY(&container->bn_raddr, &meta->bm_raddr);
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DEBUGASSERT(frame != NULL);
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container->bn_iob = frame;
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/* Add the container to the tail of the list of incoming frames */
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container->bn_flink = NULL;
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if (conn->bc_rxtail == NULL)
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{
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conn->bc_rxhead = container;
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}
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else
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{
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conn->bc_rxtail->bn_flink = container;
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}
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conn->bc_rxtail = container;
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#if CONFIG_NET_BLUETOOTH_BACKLOG > 0
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/* If incrementing the count would exceed the maximum bc_backlog value,
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* then delete the oldest frame from the head of the RX queue.
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*/
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if (conn->bc_backlog >= CONFIG_NET_BLUETOOTH_BACKLOG)
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{
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DEBUGASSERT(conn->bc_backlog == CONFIG_NET_BLUETOOTH_BACKLOG);
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/* Remove the container from the tail RX input queue. */
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container = conn->bc_rxhead;
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DEBUGASSERT(container != NULL);
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conn->bc_rxhead = container->bn_flink;
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container->bn_flink = NULL;
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/* Did the RX queue become empty? */
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if (conn->bc_rxhead == NULL)
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{
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conn->bc_rxtail = NULL;
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}
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DEBUGASSERT(container != NULL && container->bn_iob != NULL);
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/* Free both the IOB and the container */
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iob_free(container->bn_iob);
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bluetooth_container_free(container);
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}
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else
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{
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/* Increment the count of frames in the queue. */
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conn->bc_backlog++;
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}
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DEBUGASSERT((int)conn->bc_backlog == bluetooth_count_frames(conn));
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#endif
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return OK;
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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: bluetooth_input
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*
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* Description:
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* Handle incoming Bluetooth input
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*
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* This function is called when the radio device driver has received an
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* frame from the network. The frame from the device driver must be
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* provided in by the IOB frame argument of the function call:
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*
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* - The frame data is in the IOB io_data[] buffer,
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* - The length of the frame is in the IOB io_len field, and
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* - The offset past and radio MAC header is provided in the io_offset
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* field.
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*
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* The frame argument may refer to a single frame (a list of length one)
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* or may it be the head of a list of multiple frames.
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*
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* - The io_flink field points to the next frame in the list (if enable)
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* - The last frame in the list will have io_flink == NULL.
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*
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* Input Parameters:
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* radio The radio network driver interface.
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* framelist - The head of an incoming list of frames. Normally this
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* would be a single frame. A list may be provided if
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* appropriate, however.
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* meta - Meta data characterizing the received frame.
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*
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* If there are multiple frames in the list, this metadata
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* must apply to all of the frames in the list.
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*
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* Returned Value:
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* OK The Bluetooth has been processed and can be deleted
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* ERROR Hold the Bluetooth and try again later. There is a listening
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* socket but no recv in place to catch the Bluetooth yet.
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* Useful when a packet arrives before a recv call is in place.
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*
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* Assumptions:
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* Called from the network diver with the network locked.
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*
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****************************************************************************/
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int bluetooth_input(FAR struct radio_driver_s *radio,
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FAR struct iob_s *framelist,
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FAR struct bluetooth_frame_meta_s *meta)
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{
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FAR struct bluetooth_conn_s *conn;
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FAR struct iob_s *frame;
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FAR struct iob_s *next;
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int ret = OK;
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/* Check if there is a connection that will accept this packet */
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conn = bluetooth_conn_active(meta);
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if (conn != NULL)
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{
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/* Setup for the application callback (NOTE: These should not be
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* used by PF_BLUETOOTH sockets).
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*/
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radio->r_dev.d_appdata = radio->r_dev.d_buf;
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radio->r_dev.d_len = 0;
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radio->r_dev.d_sndlen = 0;
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/* The framelist probably contains only a single frame, but we will
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* process it as a list of frames.
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*/
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for (frame = framelist; frame != NULL; frame = next)
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{
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/* Remove the frame from the list */
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next = frame->io_flink;
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frame->io_flink = NULL;
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/* Add the frame to the RX queue */
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ret = bluetooth_queue_frame(conn, frame, meta);
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if (ret < 0)
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{
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nerr("ERROR: Failed to queue frame: %d\n", ret);
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iob_free(frame);
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}
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}
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/* Perform the application callback. The frame may be processed now
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* if there is a user wait for an incoming frame. Or it may pend in
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* the RX queue until some user process reads the frame. NOTE: The
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* return value from bluetooth_callback would distinguish these
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* cases: BLUETOOTH_NEWDATA will still be processed if the frame
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* was not consumed.
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*/
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bluetooth_callback(radio, conn, BLUETOOTH_NEWDATA);
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}
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else
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{
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nwarn("WARNING: No listener\n");
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}
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return ret;
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}
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#endif /* CONFIG_NET_BLUETOOTH */
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