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/*
* Copyright 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "l2cap/internal/le_credit_based_channel_data_controller.h"
#include "l2cap/l2cap_packets.h"
#include "l2cap/le/internal/link.h"
#include "packet/fragmenting_inserter.h"
#include "packet/raw_builder.h"
namespace bluetooth {
namespace l2cap {
namespace internal {
LeCreditBasedDataController::LeCreditBasedDataController(ILink* link, Cid cid, Cid remote_cid,
UpperQueueDownEnd* channel_queue_end, os::Handler* handler,
Scheduler* scheduler)
: cid_(cid), remote_cid_(remote_cid), enqueue_buffer_(channel_queue_end), handler_(handler), scheduler_(scheduler),
link_(link) {}
void LeCreditBasedDataController::OnSdu(std::unique_ptr<packet::BasePacketBuilder> sdu) {
auto sdu_size = sdu->size();
if (sdu_size == 0) {
LOG_WARN("Received empty SDU");
return;
}
if (sdu_size > mtu_) {
LOG_WARN("Received sdu_size %d > mtu %d", static_cast<int>(sdu_size), mtu_);
}
std::vector<std::unique_ptr<packet::RawBuilder>> segments;
// TODO: We don't need to waste 2 bytes for continuation segment.
packet::FragmentingInserter fragmenting_inserter(mps_ - 2, std::back_insert_iterator(segments));
sdu->Serialize(fragmenting_inserter);
fragmenting_inserter.finalize();
std::unique_ptr<BasicFrameBuilder> builder;
builder = FirstLeInformationFrameBuilder::Create(remote_cid_, sdu_size, std::move(segments[0]));
pdu_queue_.emplace(std::move(builder));
for (size_t i = 1; i < segments.size(); i++) {
builder = BasicFrameBuilder::Create(remote_cid_, std::move(segments[i]));
pdu_queue_.emplace(std::move(builder));
}
if (credits_ >= segments.size()) {
scheduler_->OnPacketsReady(cid_, segments.size());
credits_ -= segments.size();
} else if (credits_ > 0) {
scheduler_->OnPacketsReady(cid_, credits_);
pending_frames_count_ += (segments.size() - credits_);
credits_ = 0;
} else {
pending_frames_count_ += segments.size();
}
}
void LeCreditBasedDataController::OnPdu(packet::PacketView<true> pdu) {
auto basic_frame_view = BasicFrameView::Create(pdu);
if (!basic_frame_view.IsValid()) {
LOG_WARN("Received invalid frame");
return;
}
if (basic_frame_view.size() > mps_) {
LOG_WARN("Received frame size %d > mps %d, dropping the packet", static_cast<int>(basic_frame_view.size()), mps_);
return;
}
if (remaining_sdu_continuation_packet_size_ == 0) {
auto start_frame_view = FirstLeInformationFrameView::Create(basic_frame_view);
if (!start_frame_view.IsValid()) {
LOG_WARN("Received invalid frame");
return;
}
auto payload = start_frame_view.GetPayload();
auto sdu_size = start_frame_view.GetL2capSduLength();
remaining_sdu_continuation_packet_size_ = sdu_size - payload.size();
reassembly_stage_ = payload;
} else {
auto payload = basic_frame_view.GetPayload();
remaining_sdu_continuation_packet_size_ -= payload.size();
reassembly_stage_.AppendPacketView(payload);
}
if (remaining_sdu_continuation_packet_size_ == 0) {
enqueue_buffer_.Enqueue(std::make_unique<PacketView<kLittleEndian>>(reassembly_stage_), handler_);
} else if (remaining_sdu_continuation_packet_size_ < 0 || reassembly_stage_.size() > mtu_) {
LOG_WARN("Received larger SDU size than expected");
reassembly_stage_ = PacketViewForReassembly(PacketView<kLittleEndian>(std::make_shared<std::vector<uint8_t>>()));
remaining_sdu_continuation_packet_size_ = 0;
link_->SendDisconnectionRequest(cid_, remote_cid_);
}
// TODO: Improve the logic by sending credit only after user dequeued the SDU
link_->SendLeCredit(cid_, 1);
}
std::unique_ptr<packet::BasePacketBuilder> LeCreditBasedDataController::GetNextPacket() {
ASSERT(!pdu_queue_.empty());
auto next = std::move(pdu_queue_.front());
pdu_queue_.pop();
return next;
}
void LeCreditBasedDataController::SetMtu(Mtu mtu) {
mtu_ = mtu;
}
void LeCreditBasedDataController::SetMps(uint16_t mps) {
mps_ = mps;
}
void LeCreditBasedDataController::OnCredit(uint16_t credits) {
int total_credits = credits_ + credits;
if (total_credits > 0xffff) {
link_->SendDisconnectionRequest(cid_, remote_cid_);
}
credits_ = total_credits;
if (pending_frames_count_ > 0 && credits_ >= pending_frames_count_) {
scheduler_->OnPacketsReady(cid_, pending_frames_count_);
pending_frames_count_ = 0;
credits_ -= pending_frames_count_;
} else if (pending_frames_count_ > 0) {
scheduler_->OnPacketsReady(cid_, credits_);
pending_frames_count_ -= credits_;
credits_ = 0;
}
}
} // namespace internal
} // namespace l2cap
} // namespace bluetooth
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