1 /* 2 * Copyright 2019 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #pragma once 18 19 #include <string> 20 #include <unordered_map> 21 22 #include "common/bidi_queue.h" 23 #include "common/bind.h" 24 #include "data_controller.h" 25 #include "l2cap/cid.h" 26 #include "l2cap/classic/internal/channel_configuration_state.h" 27 #include "l2cap/internal/channel_impl.h" 28 #include "l2cap/internal/data_controller.h" 29 #include "l2cap/l2cap_packets.h" 30 #include "l2cap/mtu.h" 31 #include "os/handler.h" 32 #include "os/queue.h" 33 #include "packet/base_packet_builder.h" 34 #include "packet/packet_view.h" 35 36 namespace bluetooth { 37 namespace l2cap { 38 namespace internal { 39 class Scheduler; 40 class ILink; 41 42 /** 43 * A middle layer between L2CAP channel and outgoing packet scheduler. 44 * Fetches data (SDU) from an L2CAP channel queue end, handles L2CAP segmentation, and gives data to L2CAP scheduler. 45 */ 46 class Sender { 47 public: 48 using UpperEnqueue = packet::PacketView<packet::kLittleEndian>; 49 using UpperDequeue = packet::BasePacketBuilder; 50 using UpperQueueDownEnd = common::BidiQueueEnd<UpperEnqueue, UpperDequeue>; 51 52 enum class ChannelMode { 53 BASIC = 0, 54 ERTM = 3, 55 LE_CREDIT_BASED = 10, 56 }; 57 58 Sender(os::Handler* handler, ILink* link, Scheduler* scheduler, std::shared_ptr<ChannelImpl> channel); 59 Sender(os::Handler* handler, ILink* link, Scheduler* scheduler, std::shared_ptr<ChannelImpl> channel, 60 ChannelMode mode); 61 ~Sender(); 62 63 /** 64 * Callback from scheduler to indicate that scheduler already dequeued a packet from sender's queue. 65 * Segmenter can continue dequeuing from channel queue end. 66 */ 67 void OnPacketSent(); 68 69 /** 70 * Called by the scheduler to return the next PDU to be sent 71 */ 72 std::unique_ptr<UpperDequeue> GetNextPacket(); 73 74 void UpdateClassicConfiguration(classic::internal::ChannelConfigurationState config); 75 DataController* GetDataController(); 76 77 private: 78 os::Handler* handler_; 79 ILink* link_; 80 UpperQueueDownEnd* queue_end_; 81 Scheduler* scheduler_; 82 const Cid channel_id_; 83 const Cid remote_channel_id_; 84 bool is_dequeue_registered_ = false; 85 RetransmissionAndFlowControlModeOption mode_ = RetransmissionAndFlowControlModeOption::L2CAP_BASIC; 86 std::unique_ptr<DataController> data_controller_; 87 88 void try_register_dequeue(); 89 void dequeue_callback(); 90 }; 91 } // namespace internal 92 } // namespace l2cap 93 } // namespace bluetooth 94