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 <atomic> 20 #include <string> 21 #include <unordered_map> 22 23 #include "common/bidi_queue.h" 24 #include "common/bind.h" 25 #include "data_controller.h" 26 #include "l2cap/cid.h" 27 #include "l2cap/classic/internal/channel_configuration_state.h" 28 #include "l2cap/internal/channel_impl.h" 29 #include "l2cap/internal/data_controller.h" 30 #include "l2cap/l2cap_packets.h" 31 #include "l2cap/mtu.h" 32 #include "os/handler.h" 33 #include "os/queue.h" 34 #include "packet/base_packet_builder.h" 35 #include "packet/packet_view.h" 36 37 namespace bluetooth { 38 namespace l2cap { 39 namespace internal { 40 class Scheduler; 41 class ILink; 42 43 /** 44 * A middle layer between L2CAP channel and outgoing packet scheduler. 45 * Fetches data (SDU) from an L2CAP channel queue end, handles L2CAP segmentation, and gives data to L2CAP scheduler. 46 */ 47 class Sender { 48 public: 49 using UpperEnqueue = packet::PacketView<packet::kLittleEndian>; 50 using UpperDequeue = packet::BasePacketBuilder; 51 using UpperQueueDownEnd = common::BidiQueueEnd<UpperEnqueue, UpperDequeue>; 52 53 enum class ChannelMode { 54 BASIC = 0, 55 ERTM = 3, 56 LE_CREDIT_BASED = 10, 57 }; 58 59 Sender(os::Handler* handler, ILink* link, Scheduler* scheduler, std::shared_ptr<ChannelImpl> channel); 60 Sender(os::Handler* handler, ILink* link, Scheduler* scheduler, std::shared_ptr<ChannelImpl> channel, 61 ChannelMode mode); 62 ~Sender(); 63 64 /** 65 * Callback from scheduler to indicate that scheduler already dequeued a packet from sender's queue. 66 * Segmenter can continue dequeuing from channel queue end. 67 */ 68 void OnPacketSent(); 69 70 /** 71 * Called by the scheduler to return the next PDU to be sent 72 */ 73 std::unique_ptr<UpperDequeue> GetNextPacket(); 74 75 void UpdateClassicConfiguration(classic::internal::ChannelConfigurationState config); 76 DataController* GetDataController(); 77 78 private: 79 os::Handler* handler_; 80 ILink* link_; 81 UpperQueueDownEnd* queue_end_; 82 Scheduler* scheduler_; 83 const Cid channel_id_; 84 const Cid remote_channel_id_; 85 std::atomic_bool is_dequeue_registered_ = false; 86 RetransmissionAndFlowControlModeOption mode_ = RetransmissionAndFlowControlModeOption::L2CAP_BASIC; 87 std::unique_ptr<DataController> data_controller_; 88 89 void try_register_dequeue(); 90 void dequeue_callback(); 91 }; 92 } // namespace internal 93 } // namespace l2cap 94 } // namespace bluetooth 95