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 <memory> 20 #include <unordered_map> 21 #include <utility> 22 23 #include "common/bidi_queue.h" 24 #include "l2cap/cid.h" 25 #include "l2cap/internal/channel_impl.h" 26 #include "l2cap/internal/data_controller.h" 27 #include "l2cap/internal/ilink.h" 28 #include "l2cap/internal/scheduler.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 40 class LeCreditBasedDataController : public DataController { 41 public: 42 using UpperEnqueue = packet::PacketView<packet::kLittleEndian>; 43 using UpperDequeue = packet::BasePacketBuilder; 44 using UpperQueueDownEnd = common::BidiQueueEnd<UpperEnqueue, UpperDequeue>; 45 LeCreditBasedDataController(ILink* link, Cid cid, Cid remote_cid, UpperQueueDownEnd* channel_queue_end, 46 os::Handler* handler, Scheduler* scheduler); 47 48 void OnSdu(std::unique_ptr<packet::BasePacketBuilder> sdu) override; 49 void OnPdu(packet::PacketView<true> pdu) override; 50 std::unique_ptr<packet::BasePacketBuilder> GetNextPacket() override; 51 EnableFcs(bool)52 void EnableFcs(bool /* enabled */) override {} SetRetransmissionAndFlowControlOptions(const RetransmissionAndFlowControlConfigurationOption &)53 void SetRetransmissionAndFlowControlOptions( 54 const RetransmissionAndFlowControlConfigurationOption& /* option */) override {} 55 56 // TODO: Set MTU and MPS from signalling channel 57 void SetMtu(Mtu mtu); 58 void SetMps(uint16_t mps); 59 // TODO: Handle credits 60 void OnCredit(uint16_t credits); 61 62 private: 63 Cid cid_; 64 Cid remote_cid_; 65 os::EnqueueBuffer<UpperEnqueue> enqueue_buffer_; 66 os::Handler* handler_; 67 std::queue<std::unique_ptr<packet::BasePacketBuilder>> pdu_queue_; 68 Scheduler* scheduler_; 69 ILink* link_; 70 Mtu mtu_ = 512; 71 uint16_t mps_ = 251; 72 uint16_t credits_ = 0; 73 uint16_t pending_frames_count_ = 0; 74 75 class PacketViewForReassembly : public packet::PacketView<kLittleEndian> { 76 public: PacketViewForReassembly(const PacketView & packetView)77 PacketViewForReassembly(const PacketView& packetView) : PacketView(packetView) {} AppendPacketView(packet::PacketView<kLittleEndian> to_append)78 void AppendPacketView(packet::PacketView<kLittleEndian> to_append) { 79 Append(to_append); 80 } 81 }; 82 PacketViewForReassembly reassembly_stage_{PacketView<kLittleEndian>(std::make_shared<std::vector<uint8_t>>())}; 83 uint16_t remaining_sdu_continuation_packet_size_ = 0; 84 }; 85 86 } // namespace internal 87 } // namespace l2cap 88 } // namespace bluetooth 89