/**************************************************************************** * net/bluetooth/bluetooth_input.c * Handle incoming Bluetooth frame input * * Copyright (C) 2018 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote * products derived from this software without specific prior * written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include #include #include "devif/devif.h" #include "bluetooth/bluetooth.h" #ifdef CONFIG_NET_BLUETOOTH /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: bluetooth_count_frames * * Description: * Return the number of frames in the RX queue. * * Input Parameters: * conn - The socket connection structure. * * Returned Value: * The number of frames in the queue. * ****************************************************************************/ #if defined(CONFIG_DEBUG_ASSERTIONS) && CONFIG_NET_BLUETOOTH_BACKLOG > 0 static int bluetooth_count_frames(FAR struct bluetooth_conn_s *conn) { FAR struct bluetooth_container_s *container; int count; for (count = 0, container = conn->bc_rxhead; container != NULL; count++, container = container->bn_flink) { } return count; } #endif /**************************************************************************** * Name: bluetooth_queue_frame * * Description: * Add one frame to the connection's RX queue. * * Input Parameters: * conn - The socket connection structure. * framel - A single frame to add to the RX queue. * meta - Meta data characterizing the received frane. * * Returned Value: * Zero (OK) is returned on success; A negated errno value is returned on * any failure. * ****************************************************************************/ static int bluetooth_queue_frame(FAR struct bluetooth_conn_s *conn, FAR struct iob_s *frame, FAR struct bluetooth_frame_meta_s *meta) { FAR struct bluetooth_container_s *container; /* Allocate a container for the frame */ container = bluetooth_container_allocate(); if (container == NULL) { nerr("ERROR: Failed to allocate a container\n"); return -ENOMEM; } /* Initialize the container */ memset(&container->bn_raddr, 0, sizeof(bt_addr_t)); container->bn_channel = meta->bm_channel; BLUETOOTH_ADDRCOPY(&container->bn_raddr, &meta->bm_raddr); DEBUGASSERT(frame != NULL); container->bn_iob = frame; /* Add the container to the tail of the list of incoming frames */ container->bn_flink = NULL; if (conn->bc_rxtail == NULL) { conn->bc_rxhead = container; } else { conn->bc_rxtail->bn_flink = container; } #if CONFIG_NET_BLUETOOTH_BACKLOG > 0 /* If incrementing the count would exceed the maximum bc_backlog value, then * delete the oldest frame from the head of the RX queue. */ if (conn->bc_backlog >= CONFIG_NET_BLUETOOTH_BACKLOG) { DEBUGASSERT(conn->bc_backlog == CONFIG_NET_BLUETOOTH_BACKLOG); /* Remove the container from the tail RX input queue. */ container = conn->bc_rxhead; DEBUGASSERT(container != NULL); conn->bc_rxhead = container->bn_flink; container->bn_flink = NULL; /* Did the RX queue become empty? */ if (conn->bc_rxhead == NULL) { conn->bc_rxtail = NULL; } DEBUGASSERT(container != NULL && container->bn_iob != NULL); /* Free both the IOB and the container */ iob_free(container->bn_iob); bluetooth_container_free(container); } else { /* Increment the count of frames in the queue. */ conn->bc_backlog++; } DEBUGASSERT((int)conn->bc_backlog == bluetooth_count_frames(conn)); #endif return OK; } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: bluetooth_input * * Description: * Handle incoming Bluetooth input * * This function is called when the radio device driver has received an * frame from the network. The frame from the device driver must be * provided in by the IOB frame argument of the function call: * * - The frame data is in the IOB io_data[] buffer, * - The length of the frame is in the IOB io_len field, and * - The offset past and radio MAC header is provided in the io_offset * field. * * The frame argument may refer to a single frame (a list of length one) * or may it be the head of a list of multiple frames. * * - The io_flink field points to the next frame in the list (if enable) * - The last frame in the list will have io_flink == NULL. * * Input Parameters: * radio The radio network driver interface. * framelist - The head of an incoming list of frames. Normally this * would be a single frame. A list may be provided if * appropriate, however. * meta - Meta data characterizing the received frame. * * If there are multiple frames in the list, this metadata * must apply to all of the frames in the list. * * Returned Value: * OK The Bluetooth has been processed and can be deleted * ERROR Hold the Bluetooth and try again later. There is a listening * socket but no recv in place to catch the Bluetooth yet. * Useful when a packet arrives before a recv call is in place. * * Assumptions: * Called from the network diver with the network locked. * ****************************************************************************/ int bluetooth_input(FAR struct radio_driver_s *radio, FAR struct iob_s *framelist, FAR struct bluetooth_frame_meta_s *meta) { FAR struct bluetooth_conn_s *conn; FAR struct iob_s *frame; FAR struct iob_s *next; int ret = OK; /* Check if there is a connection that will accept this packet */ conn = bluetooth_conn_active(meta); if (conn != NULL) { /* Setup for the application callback (NOTE: These should not be * used by PF_BLUETOOTH sockets). */ radio->r_dev.d_appdata = radio->r_dev.d_buf; radio->r_dev.d_len = 0; radio->r_dev.d_sndlen = 0; /* The framelist probably contains only a single frame, but we will * process it as a list of frames. */ for (frame = framelist; frame != NULL; frame = next) { /* Remove the frame from the list */ next = frame->io_flink; frame->io_flink = NULL; /* Add the frame to the RX queue */ ret = bluetooth_queue_frame(conn, frame, meta); if (ret < 0) { nerr("ERROR: Failed to queue frame: %d\n", ret); iob_free(frame); } } /* Perform the application callback. The frame may be processed now * if there is a user wait for an incoming frame. Or it may pend in * the RX queue until some user process reads the frame. NOTE: The * return value from bluetooth_callback would distinguish these * cases: BLUETOOTH_NEWDATA will still be processed if the frame * was not consumed. */ (void)bluetooth_callback(radio, conn, BLUETOOTH_NEWDATA); } else { nwarn("WARNING: No listener\n"); } return ret; } #endif /* CONFIG_NET_BLUETOOTH */