| /* |
| * Copyright (c) 2021 The WebRTC project authors. All Rights Reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| #include "net/dcsctp/tx/retransmission_queue.h" |
| |
| #include <cstddef> |
| #include <cstdint> |
| #include <functional> |
| #include <memory> |
| #include <utility> |
| #include <vector> |
| |
| #include "absl/types/optional.h" |
| #include "api/array_view.h" |
| #include "net/dcsctp/common/handover_testing.h" |
| #include "net/dcsctp/common/math.h" |
| #include "net/dcsctp/packet/chunk/data_chunk.h" |
| #include "net/dcsctp/packet/chunk/forward_tsn_chunk.h" |
| #include "net/dcsctp/packet/chunk/forward_tsn_common.h" |
| #include "net/dcsctp/packet/chunk/iforward_tsn_chunk.h" |
| #include "net/dcsctp/packet/chunk/sack_chunk.h" |
| #include "net/dcsctp/packet/data.h" |
| #include "net/dcsctp/public/dcsctp_options.h" |
| #include "net/dcsctp/testing/data_generator.h" |
| #include "net/dcsctp/timer/fake_timeout.h" |
| #include "net/dcsctp/timer/timer.h" |
| #include "net/dcsctp/tx/mock_send_queue.h" |
| #include "net/dcsctp/tx/send_queue.h" |
| #include "rtc_base/gunit.h" |
| #include "test/gmock.h" |
| |
| namespace dcsctp { |
| namespace { |
| using ::testing::MockFunction; |
| using State = ::dcsctp::RetransmissionQueue::State; |
| using ::testing::_; |
| using ::testing::ElementsAre; |
| using ::testing::IsEmpty; |
| using ::testing::NiceMock; |
| using ::testing::Pair; |
| using ::testing::Return; |
| using ::testing::SizeIs; |
| using ::testing::UnorderedElementsAre; |
| |
| constexpr uint32_t kArwnd = 100000; |
| constexpr uint32_t kMaxMtu = 1191; |
| |
| DcSctpOptions MakeOptions() { |
| DcSctpOptions options; |
| options.mtu = kMaxMtu; |
| return options; |
| } |
| |
| class RetransmissionQueueTest : public testing::Test { |
| protected: |
| RetransmissionQueueTest() |
| : options_(MakeOptions()), |
| gen_(MID(42)), |
| timeout_manager_([this]() { return now_; }), |
| timer_manager_([this]() { return timeout_manager_.CreateTimeout(); }), |
| timer_(timer_manager_.CreateTimer( |
| "test/t3_rtx", |
| []() { return absl::nullopt; }, |
| TimerOptions(DurationMs(0)))) {} |
| |
| std::function<SendQueue::DataToSend(TimeMs, size_t)> CreateChunk() { |
| return [this](TimeMs now, size_t max_size) { |
| return SendQueue::DataToSend(gen_.Ordered({1, 2, 3, 4}, "BE")); |
| }; |
| } |
| |
| std::vector<TSN> GetSentPacketTSNs(RetransmissionQueue& queue) { |
| std::vector<TSN> tsns; |
| for (const auto& elem : queue.GetChunksToSend(now_, 10000)) { |
| tsns.push_back(elem.first); |
| } |
| return tsns; |
| } |
| |
| RetransmissionQueue CreateQueue(bool supports_partial_reliability = true, |
| bool use_message_interleaving = false) { |
| return RetransmissionQueue( |
| "", TSN(10), kArwnd, producer_, on_rtt_.AsStdFunction(), |
| on_clear_retransmission_counter_.AsStdFunction(), *timer_, options_, |
| supports_partial_reliability, use_message_interleaving); |
| } |
| |
| RetransmissionQueue CreateQueueByHandover(RetransmissionQueue& queue) { |
| EXPECT_EQ(queue.GetHandoverReadiness(), HandoverReadinessStatus()); |
| DcSctpSocketHandoverState state; |
| queue.AddHandoverState(state); |
| g_handover_state_transformer_for_test(&state); |
| return RetransmissionQueue( |
| "", TSN(10), kArwnd, producer_, on_rtt_.AsStdFunction(), |
| on_clear_retransmission_counter_.AsStdFunction(), *timer_, options_, |
| /*supports_partial_reliability=*/true, |
| /*use_message_interleaving=*/false, &state); |
| } |
| |
| DcSctpOptions options_; |
| DataGenerator gen_; |
| TimeMs now_ = TimeMs(0); |
| FakeTimeoutManager timeout_manager_; |
| TimerManager timer_manager_; |
| NiceMock<MockFunction<void(DurationMs rtt_ms)>> on_rtt_; |
| NiceMock<MockFunction<void()>> on_clear_retransmission_counter_; |
| NiceMock<MockSendQueue> producer_; |
| std::unique_ptr<Timer> timer_; |
| }; |
| |
| TEST_F(RetransmissionQueueTest, InitialAckedPrevTsn) { |
| RetransmissionQueue queue = CreateQueue(); |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked))); |
| } |
| |
| TEST_F(RetransmissionQueueTest, SendOneChunk) { |
| RetransmissionQueue queue = CreateQueue(); |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce(CreateChunk()) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| |
| EXPECT_THAT(GetSentPacketTSNs(queue), testing::ElementsAre(TSN(10))); |
| |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kInFlight))); |
| } |
| |
| TEST_F(RetransmissionQueueTest, SendOneChunkAndAck) { |
| RetransmissionQueue queue = CreateQueue(); |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce(CreateChunk()) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| |
| EXPECT_THAT(GetSentPacketTSNs(queue), testing::ElementsAre(TSN(10))); |
| |
| queue.HandleSack(now_, SackChunk(TSN(10), kArwnd, {}, {})); |
| |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(10), State::kAcked))); |
| } |
| |
| TEST_F(RetransmissionQueueTest, SendThreeChunksAndAckTwo) { |
| RetransmissionQueue queue = CreateQueue(); |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| |
| EXPECT_THAT(GetSentPacketTSNs(queue), |
| testing::ElementsAre(TSN(10), TSN(11), TSN(12))); |
| |
| queue.HandleSack(now_, SackChunk(TSN(11), kArwnd, {}, {})); |
| |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(11), State::kAcked), // |
| Pair(TSN(12), State::kInFlight))); |
| } |
| |
| TEST_F(RetransmissionQueueTest, AckWithGapBlocksFromRFC4960Section334) { |
| RetransmissionQueue queue = CreateQueue(); |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| |
| EXPECT_THAT(GetSentPacketTSNs(queue), |
| testing::ElementsAre(TSN(10), TSN(11), TSN(12), TSN(13), TSN(14), |
| TSN(15), TSN(16), TSN(17))); |
| |
| queue.HandleSack(now_, SackChunk(TSN(12), kArwnd, |
| {SackChunk::GapAckBlock(2, 3), |
| SackChunk::GapAckBlock(5, 5)}, |
| {})); |
| |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(12), State::kAcked), // |
| Pair(TSN(13), State::kNacked), // |
| Pair(TSN(14), State::kAcked), // |
| Pair(TSN(15), State::kAcked), // |
| Pair(TSN(16), State::kNacked), // |
| Pair(TSN(17), State::kAcked))); |
| } |
| |
| TEST_F(RetransmissionQueueTest, ResendPacketsWhenNackedThreeTimes) { |
| RetransmissionQueue queue = CreateQueue(); |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| |
| EXPECT_THAT(GetSentPacketTSNs(queue), |
| testing::ElementsAre(TSN(10), TSN(11), TSN(12), TSN(13), TSN(14), |
| TSN(15), TSN(16), TSN(17))); |
| |
| // Send more chunks, but leave some as gaps to force retransmission after |
| // three NACKs. |
| |
| // Send 18 |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce(CreateChunk()) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| EXPECT_THAT(GetSentPacketTSNs(queue), testing::ElementsAre(TSN(18))); |
| |
| // Ack 12, 14-15, 17-18 |
| queue.HandleSack(now_, SackChunk(TSN(12), kArwnd, |
| {SackChunk::GapAckBlock(2, 3), |
| SackChunk::GapAckBlock(5, 6)}, |
| {})); |
| |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(12), State::kAcked), // |
| Pair(TSN(13), State::kNacked), // |
| Pair(TSN(14), State::kAcked), // |
| Pair(TSN(15), State::kAcked), // |
| Pair(TSN(16), State::kNacked), // |
| Pair(TSN(17), State::kAcked), // |
| Pair(TSN(18), State::kAcked))); |
| |
| // Send 19 |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce(CreateChunk()) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| EXPECT_THAT(GetSentPacketTSNs(queue), testing::ElementsAre(TSN(19))); |
| |
| // Ack 12, 14-15, 17-19 |
| queue.HandleSack(now_, SackChunk(TSN(12), kArwnd, |
| {SackChunk::GapAckBlock(2, 3), |
| SackChunk::GapAckBlock(5, 7)}, |
| {})); |
| |
| // Send 20 |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce(CreateChunk()) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| EXPECT_THAT(GetSentPacketTSNs(queue), testing::ElementsAre(TSN(20))); |
| |
| // Ack 12, 14-15, 17-20 |
| queue.HandleSack(now_, SackChunk(TSN(12), kArwnd, |
| {SackChunk::GapAckBlock(2, 3), |
| SackChunk::GapAckBlock(5, 8)}, |
| {})); |
| |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(12), State::kAcked), // |
| Pair(TSN(13), State::kToBeRetransmitted), // |
| Pair(TSN(14), State::kAcked), // |
| Pair(TSN(15), State::kAcked), // |
| Pair(TSN(16), State::kToBeRetransmitted), // |
| Pair(TSN(17), State::kAcked), // |
| Pair(TSN(18), State::kAcked), // |
| Pair(TSN(19), State::kAcked), // |
| Pair(TSN(20), State::kAcked))); |
| |
| // This will trigger "fast retransmit" mode and only chunks 13 and 16 will be |
| // resent right now. The send queue will not even be queried. |
| EXPECT_CALL(producer_, Produce).Times(0); |
| |
| EXPECT_THAT(GetSentPacketTSNs(queue), testing::ElementsAre(TSN(13), TSN(16))); |
| |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(12), State::kAcked), // |
| Pair(TSN(13), State::kInFlight), // |
| Pair(TSN(14), State::kAcked), // |
| Pair(TSN(15), State::kAcked), // |
| Pair(TSN(16), State::kInFlight), // |
| Pair(TSN(17), State::kAcked), // |
| Pair(TSN(18), State::kAcked), // |
| Pair(TSN(19), State::kAcked), // |
| Pair(TSN(20), State::kAcked))); |
| } |
| |
| TEST_F(RetransmissionQueueTest, CanOnlyProduceTwoPacketsButWantsToSendThree) { |
| RetransmissionQueue queue = CreateQueue(); |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce([this](TimeMs, size_t) { |
| return SendQueue::DataToSend(gen_.Ordered({1, 2, 3, 4}, "BE")); |
| }) |
| .WillOnce([this](TimeMs, size_t) { |
| return SendQueue::DataToSend(gen_.Ordered({1, 2, 3, 4}, "BE")); |
| }) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| |
| std::vector<std::pair<TSN, Data>> chunks_to_send = |
| queue.GetChunksToSend(now_, 1000); |
| EXPECT_THAT(chunks_to_send, ElementsAre(Pair(TSN(10), _), Pair(TSN(11), _))); |
| |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kInFlight), // |
| Pair(TSN(11), State::kInFlight))); |
| } |
| |
| TEST_F(RetransmissionQueueTest, RetransmitsOnT3Expiry) { |
| RetransmissionQueue queue = CreateQueue(); |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce([this](TimeMs, size_t) { |
| return SendQueue::DataToSend(gen_.Ordered({1, 2, 3, 4}, "BE")); |
| }) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| |
| EXPECT_FALSE(queue.ShouldSendForwardTsn(now_)); |
| std::vector<std::pair<TSN, Data>> chunks_to_send = |
| queue.GetChunksToSend(now_, 1000); |
| EXPECT_THAT(chunks_to_send, ElementsAre(Pair(TSN(10), _))); |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kInFlight))); |
| |
| // Will force chunks to be retransmitted |
| queue.HandleT3RtxTimerExpiry(); |
| |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kToBeRetransmitted))); |
| |
| EXPECT_FALSE(queue.ShouldSendForwardTsn(now_)); |
| |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kToBeRetransmitted))); |
| |
| std::vector<std::pair<TSN, Data>> chunks_to_rtx = |
| queue.GetChunksToSend(now_, 1000); |
| EXPECT_THAT(chunks_to_rtx, ElementsAre(Pair(TSN(10), _))); |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kInFlight))); |
| } |
| |
| TEST_F(RetransmissionQueueTest, LimitedRetransmissionOnlyWithRfc3758Support) { |
| RetransmissionQueue queue = |
| CreateQueue(/*supports_partial_reliability=*/false); |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce([this](TimeMs, size_t) { |
| SendQueue::DataToSend dts(gen_.Ordered({1, 2, 3, 4}, "BE")); |
| dts.max_retransmissions = MaxRetransmits(0); |
| return dts; |
| }) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| |
| EXPECT_FALSE(queue.ShouldSendForwardTsn(now_)); |
| std::vector<std::pair<TSN, Data>> chunks_to_send = |
| queue.GetChunksToSend(now_, 1000); |
| EXPECT_THAT(chunks_to_send, ElementsAre(Pair(TSN(10), _))); |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kInFlight))); |
| |
| // Will force chunks to be retransmitted |
| queue.HandleT3RtxTimerExpiry(); |
| |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kToBeRetransmitted))); |
| |
| EXPECT_CALL(producer_, Discard(IsUnordered(false), StreamID(1), MID(42))) |
| .Times(0); |
| EXPECT_FALSE(queue.ShouldSendForwardTsn(now_)); |
| } // namespace dcsctp |
| |
| TEST_F(RetransmissionQueueTest, LimitsRetransmissionsAsUdp) { |
| RetransmissionQueue queue = CreateQueue(); |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce([this](TimeMs, size_t) { |
| SendQueue::DataToSend dts(gen_.Ordered({1, 2, 3, 4}, "BE")); |
| dts.max_retransmissions = MaxRetransmits(0); |
| return dts; |
| }) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| |
| EXPECT_FALSE(queue.ShouldSendForwardTsn(now_)); |
| std::vector<std::pair<TSN, Data>> chunks_to_send = |
| queue.GetChunksToSend(now_, 1000); |
| EXPECT_THAT(chunks_to_send, ElementsAre(Pair(TSN(10), _))); |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kInFlight))); |
| |
| // Will force chunks to be retransmitted |
| EXPECT_CALL(producer_, Discard(IsUnordered(false), StreamID(1), MID(42))) |
| .Times(1); |
| |
| queue.HandleT3RtxTimerExpiry(); |
| |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kAbandoned))); |
| |
| EXPECT_TRUE(queue.ShouldSendForwardTsn(now_)); |
| |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kAbandoned))); |
| |
| std::vector<std::pair<TSN, Data>> chunks_to_rtx = |
| queue.GetChunksToSend(now_, 1000); |
| EXPECT_THAT(chunks_to_rtx, testing::IsEmpty()); |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kAbandoned))); |
| } |
| |
| TEST_F(RetransmissionQueueTest, LimitsRetransmissionsToThreeSends) { |
| RetransmissionQueue queue = CreateQueue(); |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce([this](TimeMs, size_t) { |
| SendQueue::DataToSend dts(gen_.Ordered({1, 2, 3, 4}, "BE")); |
| dts.max_retransmissions = MaxRetransmits(3); |
| return dts; |
| }) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| |
| EXPECT_FALSE(queue.ShouldSendForwardTsn(now_)); |
| std::vector<std::pair<TSN, Data>> chunks_to_send = |
| queue.GetChunksToSend(now_, 1000); |
| EXPECT_THAT(chunks_to_send, ElementsAre(Pair(TSN(10), _))); |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kInFlight))); |
| |
| EXPECT_CALL(producer_, Discard(IsUnordered(false), StreamID(1), MID(42))) |
| .Times(0); |
| |
| // Retransmission 1 |
| queue.HandleT3RtxTimerExpiry(); |
| EXPECT_FALSE(queue.ShouldSendForwardTsn(now_)); |
| EXPECT_THAT(queue.GetChunksToSend(now_, 1000), SizeIs(1)); |
| |
| // Retransmission 2 |
| queue.HandleT3RtxTimerExpiry(); |
| EXPECT_FALSE(queue.ShouldSendForwardTsn(now_)); |
| EXPECT_THAT(queue.GetChunksToSend(now_, 1000), SizeIs(1)); |
| |
| // Retransmission 3 |
| queue.HandleT3RtxTimerExpiry(); |
| EXPECT_FALSE(queue.ShouldSendForwardTsn(now_)); |
| EXPECT_THAT(queue.GetChunksToSend(now_, 1000), SizeIs(1)); |
| |
| // Retransmission 4 - not allowed. |
| EXPECT_CALL(producer_, Discard(IsUnordered(false), StreamID(1), MID(42))) |
| .Times(1); |
| queue.HandleT3RtxTimerExpiry(); |
| EXPECT_TRUE(queue.ShouldSendForwardTsn(now_)); |
| EXPECT_THAT(queue.GetChunksToSend(now_, 1000), IsEmpty()); |
| |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kAbandoned))); |
| } |
| |
| TEST_F(RetransmissionQueueTest, RetransmitsWhenSendBufferIsFullT3Expiry) { |
| RetransmissionQueue queue = CreateQueue(); |
| static constexpr size_t kCwnd = 1200; |
| queue.set_cwnd(kCwnd); |
| EXPECT_EQ(queue.cwnd(), kCwnd); |
| EXPECT_EQ(queue.outstanding_bytes(), 0u); |
| EXPECT_EQ(queue.outstanding_items(), 0u); |
| |
| std::vector<uint8_t> payload(1000); |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce([this, payload](TimeMs, size_t) { |
| return SendQueue::DataToSend(gen_.Ordered(payload, "BE")); |
| }) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| |
| std::vector<std::pair<TSN, Data>> chunks_to_send = |
| queue.GetChunksToSend(now_, 1500); |
| EXPECT_THAT(chunks_to_send, ElementsAre(Pair(TSN(10), _))); |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kInFlight))); |
| EXPECT_EQ(queue.outstanding_bytes(), payload.size() + DataChunk::kHeaderSize); |
| EXPECT_EQ(queue.outstanding_items(), 1u); |
| |
| // Will force chunks to be retransmitted |
| queue.HandleT3RtxTimerExpiry(); |
| |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kToBeRetransmitted))); |
| EXPECT_EQ(queue.outstanding_bytes(), 0u); |
| EXPECT_EQ(queue.outstanding_items(), 0u); |
| |
| std::vector<std::pair<TSN, Data>> chunks_to_rtx = |
| queue.GetChunksToSend(now_, 1500); |
| EXPECT_THAT(chunks_to_rtx, ElementsAre(Pair(TSN(10), _))); |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kInFlight))); |
| EXPECT_EQ(queue.outstanding_bytes(), payload.size() + DataChunk::kHeaderSize); |
| EXPECT_EQ(queue.outstanding_items(), 1u); |
| } |
| |
| TEST_F(RetransmissionQueueTest, ProducesValidForwardTsn) { |
| RetransmissionQueue queue = CreateQueue(); |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce([this](TimeMs, size_t) { |
| SendQueue::DataToSend dts(gen_.Ordered({1, 2, 3, 4}, "B")); |
| dts.max_retransmissions = MaxRetransmits(0); |
| return dts; |
| }) |
| .WillOnce([this](TimeMs, size_t) { |
| SendQueue::DataToSend dts(gen_.Ordered({5, 6, 7, 8}, "")); |
| dts.max_retransmissions = MaxRetransmits(0); |
| return dts; |
| }) |
| .WillOnce([this](TimeMs, size_t) { |
| SendQueue::DataToSend dts(gen_.Ordered({9, 10, 11, 12}, "")); |
| dts.max_retransmissions = MaxRetransmits(0); |
| return dts; |
| }) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| |
| // Send and ack first chunk (TSN 10) |
| std::vector<std::pair<TSN, Data>> chunks_to_send = |
| queue.GetChunksToSend(now_, 1000); |
| EXPECT_THAT(chunks_to_send, ElementsAre(Pair(TSN(10), _), Pair(TSN(11), _), |
| Pair(TSN(12), _))); |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kInFlight), // |
| Pair(TSN(11), State::kInFlight), // |
| Pair(TSN(12), State::kInFlight))); |
| |
| // Chunk 10 is acked, but the remaining are lost |
| queue.HandleSack(now_, SackChunk(TSN(10), kArwnd, {}, {})); |
| |
| EXPECT_CALL(producer_, Discard(IsUnordered(false), StreamID(1), MID(42))) |
| .WillOnce(Return(true)); |
| |
| queue.HandleT3RtxTimerExpiry(); |
| |
| // NOTE: The TSN=13 represents the end fragment. |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(10), State::kAcked), // |
| Pair(TSN(11), State::kAbandoned), // |
| Pair(TSN(12), State::kAbandoned), // |
| Pair(TSN(13), State::kAbandoned))); |
| |
| EXPECT_TRUE(queue.ShouldSendForwardTsn(now_)); |
| |
| ForwardTsnChunk forward_tsn = queue.CreateForwardTsn(); |
| EXPECT_EQ(forward_tsn.new_cumulative_tsn(), TSN(13)); |
| EXPECT_THAT(forward_tsn.skipped_streams(), |
| UnorderedElementsAre( |
| ForwardTsnChunk::SkippedStream(StreamID(1), SSN(42)))); |
| } |
| |
| TEST_F(RetransmissionQueueTest, ProducesValidForwardTsnWhenFullySent) { |
| RetransmissionQueue queue = CreateQueue(); |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce([this](TimeMs, size_t) { |
| SendQueue::DataToSend dts(gen_.Ordered({1, 2, 3, 4}, "B")); |
| dts.max_retransmissions = MaxRetransmits(0); |
| return dts; |
| }) |
| .WillOnce([this](TimeMs, size_t) { |
| SendQueue::DataToSend dts(gen_.Ordered({5, 6, 7, 8}, "")); |
| dts.max_retransmissions = MaxRetransmits(0); |
| return dts; |
| }) |
| .WillOnce([this](TimeMs, size_t) { |
| SendQueue::DataToSend dts(gen_.Ordered({9, 10, 11, 12}, "E")); |
| dts.max_retransmissions = MaxRetransmits(0); |
| return dts; |
| }) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| |
| // Send and ack first chunk (TSN 10) |
| std::vector<std::pair<TSN, Data>> chunks_to_send = |
| queue.GetChunksToSend(now_, 1000); |
| EXPECT_THAT(chunks_to_send, ElementsAre(Pair(TSN(10), _), Pair(TSN(11), _), |
| Pair(TSN(12), _))); |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kInFlight), // |
| Pair(TSN(11), State::kInFlight), // |
| Pair(TSN(12), State::kInFlight))); |
| |
| // Chunk 10 is acked, but the remaining are lost |
| queue.HandleSack(now_, SackChunk(TSN(10), kArwnd, {}, {})); |
| |
| EXPECT_CALL(producer_, Discard(IsUnordered(false), StreamID(1), MID(42))) |
| .WillOnce(Return(false)); |
| |
| queue.HandleT3RtxTimerExpiry(); |
| |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(10), State::kAcked), // |
| Pair(TSN(11), State::kAbandoned), // |
| Pair(TSN(12), State::kAbandoned))); |
| |
| EXPECT_TRUE(queue.ShouldSendForwardTsn(now_)); |
| |
| ForwardTsnChunk forward_tsn = queue.CreateForwardTsn(); |
| EXPECT_EQ(forward_tsn.new_cumulative_tsn(), TSN(12)); |
| EXPECT_THAT(forward_tsn.skipped_streams(), |
| UnorderedElementsAre( |
| ForwardTsnChunk::SkippedStream(StreamID(1), SSN(42)))); |
| } |
| |
| TEST_F(RetransmissionQueueTest, ProducesValidIForwardTsn) { |
| RetransmissionQueue queue = CreateQueue(/*use_message_interleaving=*/true); |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce([this](TimeMs, size_t) { |
| DataGeneratorOptions opts; |
| opts.stream_id = StreamID(1); |
| SendQueue::DataToSend dts(gen_.Ordered({1, 2, 3, 4}, "B", opts)); |
| dts.max_retransmissions = MaxRetransmits(0); |
| return dts; |
| }) |
| .WillOnce([this](TimeMs, size_t) { |
| DataGeneratorOptions opts; |
| opts.stream_id = StreamID(2); |
| SendQueue::DataToSend dts(gen_.Unordered({1, 2, 3, 4}, "B", opts)); |
| dts.max_retransmissions = MaxRetransmits(0); |
| return dts; |
| }) |
| .WillOnce([this](TimeMs, size_t) { |
| DataGeneratorOptions opts; |
| opts.stream_id = StreamID(3); |
| SendQueue::DataToSend dts(gen_.Ordered({9, 10, 11, 12}, "B", opts)); |
| dts.max_retransmissions = MaxRetransmits(0); |
| return dts; |
| }) |
| .WillOnce([this](TimeMs, size_t) { |
| DataGeneratorOptions opts; |
| opts.stream_id = StreamID(4); |
| SendQueue::DataToSend dts(gen_.Ordered({13, 14, 15, 16}, "B", opts)); |
| dts.max_retransmissions = MaxRetransmits(0); |
| return dts; |
| }) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| |
| std::vector<std::pair<TSN, Data>> chunks_to_send = |
| queue.GetChunksToSend(now_, 1000); |
| EXPECT_THAT(chunks_to_send, ElementsAre(Pair(TSN(10), _), Pair(TSN(11), _), |
| Pair(TSN(12), _), Pair(TSN(13), _))); |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kInFlight), // |
| Pair(TSN(11), State::kInFlight), // |
| Pair(TSN(12), State::kInFlight), // |
| Pair(TSN(13), State::kInFlight))); |
| |
| // Chunk 13 is acked, but the remaining are lost |
| queue.HandleSack( |
| now_, SackChunk(TSN(9), kArwnd, {SackChunk::GapAckBlock(4, 4)}, {})); |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kNacked), // |
| Pair(TSN(11), State::kNacked), // |
| Pair(TSN(12), State::kNacked), // |
| Pair(TSN(13), State::kAcked))); |
| |
| EXPECT_CALL(producer_, Discard(IsUnordered(false), StreamID(1), MID(42))) |
| .WillOnce(Return(true)); |
| EXPECT_CALL(producer_, Discard(IsUnordered(true), StreamID(2), MID(42))) |
| .WillOnce(Return(true)); |
| EXPECT_CALL(producer_, Discard(IsUnordered(false), StreamID(3), MID(42))) |
| .WillOnce(Return(true)); |
| |
| queue.HandleT3RtxTimerExpiry(); |
| |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kAbandoned), // |
| Pair(TSN(11), State::kAbandoned), // |
| Pair(TSN(12), State::kAbandoned), // |
| Pair(TSN(13), State::kAcked), |
| // Representing end fragments of stream 1-3 |
| Pair(TSN(14), State::kAbandoned), // |
| Pair(TSN(15), State::kAbandoned), // |
| Pair(TSN(16), State::kAbandoned))); |
| |
| EXPECT_TRUE(queue.ShouldSendForwardTsn(now_)); |
| |
| IForwardTsnChunk forward_tsn1 = queue.CreateIForwardTsn(); |
| EXPECT_EQ(forward_tsn1.new_cumulative_tsn(), TSN(12)); |
| EXPECT_THAT( |
| forward_tsn1.skipped_streams(), |
| UnorderedElementsAre(IForwardTsnChunk::SkippedStream( |
| IsUnordered(false), StreamID(1), MID(42)), |
| IForwardTsnChunk::SkippedStream( |
| IsUnordered(true), StreamID(2), MID(42)), |
| IForwardTsnChunk::SkippedStream( |
| IsUnordered(false), StreamID(3), MID(42)))); |
| |
| // When TSN 13 is acked, the placeholder "end fragments" must be skipped as |
| // well. |
| |
| // A receiver is more likely to ack TSN 13, but do it incrementally. |
| queue.HandleSack(now_, SackChunk(TSN(12), kArwnd, {}, {})); |
| |
| EXPECT_CALL(producer_, Discard).Times(0); |
| EXPECT_FALSE(queue.ShouldSendForwardTsn(now_)); |
| |
| queue.HandleSack(now_, SackChunk(TSN(13), kArwnd, {}, {})); |
| EXPECT_TRUE(queue.ShouldSendForwardTsn(now_)); |
| |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(13), State::kAcked), // |
| Pair(TSN(14), State::kAbandoned), // |
| Pair(TSN(15), State::kAbandoned), // |
| Pair(TSN(16), State::kAbandoned))); |
| |
| IForwardTsnChunk forward_tsn2 = queue.CreateIForwardTsn(); |
| EXPECT_EQ(forward_tsn2.new_cumulative_tsn(), TSN(16)); |
| EXPECT_THAT( |
| forward_tsn2.skipped_streams(), |
| UnorderedElementsAre(IForwardTsnChunk::SkippedStream( |
| IsUnordered(false), StreamID(1), MID(42)), |
| IForwardTsnChunk::SkippedStream( |
| IsUnordered(true), StreamID(2), MID(42)), |
| IForwardTsnChunk::SkippedStream( |
| IsUnordered(false), StreamID(3), MID(42)))); |
| } |
| |
| TEST_F(RetransmissionQueueTest, MeasureRTT) { |
| RetransmissionQueue queue = CreateQueue(/*use_message_interleaving=*/true); |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce([this](TimeMs, size_t) { |
| SendQueue::DataToSend dts(gen_.Ordered({1, 2, 3, 4}, "B")); |
| dts.max_retransmissions = MaxRetransmits(0); |
| return dts; |
| }) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| |
| std::vector<std::pair<TSN, Data>> chunks_to_send = |
| queue.GetChunksToSend(now_, 1000); |
| EXPECT_THAT(chunks_to_send, ElementsAre(Pair(TSN(10), _))); |
| |
| now_ = now_ + DurationMs(123); |
| |
| EXPECT_CALL(on_rtt_, Call(DurationMs(123))).Times(1); |
| queue.HandleSack(now_, SackChunk(TSN(10), kArwnd, {}, {})); |
| } |
| |
| TEST_F(RetransmissionQueueTest, ValidateCumTsnAtRest) { |
| RetransmissionQueue queue = CreateQueue(/*use_message_interleaving=*/true); |
| |
| EXPECT_FALSE(queue.HandleSack(now_, SackChunk(TSN(8), kArwnd, {}, {}))); |
| EXPECT_TRUE(queue.HandleSack(now_, SackChunk(TSN(9), kArwnd, {}, {}))); |
| EXPECT_FALSE(queue.HandleSack(now_, SackChunk(TSN(10), kArwnd, {}, {}))); |
| } |
| |
| TEST_F(RetransmissionQueueTest, ValidateCumTsnAckOnInflightData) { |
| RetransmissionQueue queue = CreateQueue(); |
| |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| |
| EXPECT_THAT(GetSentPacketTSNs(queue), |
| testing::ElementsAre(TSN(10), TSN(11), TSN(12), TSN(13), TSN(14), |
| TSN(15), TSN(16), TSN(17))); |
| |
| EXPECT_FALSE(queue.HandleSack(now_, SackChunk(TSN(8), kArwnd, {}, {}))); |
| EXPECT_TRUE(queue.HandleSack(now_, SackChunk(TSN(9), kArwnd, {}, {}))); |
| EXPECT_TRUE(queue.HandleSack(now_, SackChunk(TSN(10), kArwnd, {}, {}))); |
| EXPECT_TRUE(queue.HandleSack(now_, SackChunk(TSN(11), kArwnd, {}, {}))); |
| EXPECT_TRUE(queue.HandleSack(now_, SackChunk(TSN(12), kArwnd, {}, {}))); |
| EXPECT_TRUE(queue.HandleSack(now_, SackChunk(TSN(13), kArwnd, {}, {}))); |
| EXPECT_TRUE(queue.HandleSack(now_, SackChunk(TSN(14), kArwnd, {}, {}))); |
| EXPECT_TRUE(queue.HandleSack(now_, SackChunk(TSN(15), kArwnd, {}, {}))); |
| EXPECT_TRUE(queue.HandleSack(now_, SackChunk(TSN(16), kArwnd, {}, {}))); |
| EXPECT_TRUE(queue.HandleSack(now_, SackChunk(TSN(17), kArwnd, {}, {}))); |
| EXPECT_FALSE(queue.HandleSack(now_, SackChunk(TSN(18), kArwnd, {}, {}))); |
| } |
| |
| TEST_F(RetransmissionQueueTest, HandleGapAckBlocksMatchingNoInflightData) { |
| RetransmissionQueue queue = CreateQueue(); |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| |
| EXPECT_THAT(GetSentPacketTSNs(queue), |
| testing::ElementsAre(TSN(10), TSN(11), TSN(12), TSN(13), TSN(14), |
| TSN(15), TSN(16), TSN(17))); |
| |
| // Ack 9, 20-25. This is an invalid SACK, but should still be handled. |
| queue.HandleSack( |
| now_, SackChunk(TSN(9), kArwnd, {SackChunk::GapAckBlock(11, 16)}, {})); |
| |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kInFlight), // |
| Pair(TSN(11), State::kInFlight), // |
| Pair(TSN(12), State::kInFlight), // |
| Pair(TSN(13), State::kInFlight), // |
| Pair(TSN(14), State::kInFlight), // |
| Pair(TSN(15), State::kInFlight), // |
| Pair(TSN(16), State::kInFlight), // |
| Pair(TSN(17), State::kInFlight))); |
| } |
| |
| TEST_F(RetransmissionQueueTest, HandleInvalidGapAckBlocks) { |
| RetransmissionQueue queue = CreateQueue(); |
| |
| // Nothing produced - nothing in retransmission queue |
| |
| // Ack 9, 12-13 |
| queue.HandleSack( |
| now_, SackChunk(TSN(9), kArwnd, {SackChunk::GapAckBlock(3, 4)}, {})); |
| |
| // Gap ack blocks are just ignore. |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked))); |
| } |
| |
| TEST_F(RetransmissionQueueTest, GapAckBlocksDoNotMoveCumTsnAck) { |
| RetransmissionQueue queue = CreateQueue(); |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| |
| EXPECT_THAT(GetSentPacketTSNs(queue), |
| testing::ElementsAre(TSN(10), TSN(11), TSN(12), TSN(13), TSN(14), |
| TSN(15), TSN(16), TSN(17))); |
| |
| // Ack 9, 10-14. This is actually an invalid ACK as the first gap can't be |
| // adjacent to the cum-tsn-ack, but it's not strictly forbidden. However, the |
| // cum-tsn-ack should not move, as the gap-ack-blocks are just advisory. |
| queue.HandleSack( |
| now_, SackChunk(TSN(9), kArwnd, {SackChunk::GapAckBlock(1, 5)}, {})); |
| |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kAcked), // |
| Pair(TSN(11), State::kAcked), // |
| Pair(TSN(12), State::kAcked), // |
| Pair(TSN(13), State::kAcked), // |
| Pair(TSN(14), State::kAcked), // |
| Pair(TSN(15), State::kInFlight), // |
| Pair(TSN(16), State::kInFlight), // |
| Pair(TSN(17), State::kInFlight))); |
| } |
| |
| TEST_F(RetransmissionQueueTest, StaysWithinAvailableSize) { |
| RetransmissionQueue queue = CreateQueue(); |
| |
| // See SctpPacketTest::ReturnsCorrectSpaceAvailableToStayWithinMTU for the |
| // magic numbers in this test. |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce([this](TimeMs, size_t size) { |
| EXPECT_EQ(size, 1176 - DataChunk::kHeaderSize); |
| |
| std::vector<uint8_t> payload(183); |
| return SendQueue::DataToSend(gen_.Ordered(payload, "BE")); |
| }) |
| .WillOnce([this](TimeMs, size_t size) { |
| EXPECT_EQ(size, 976 - DataChunk::kHeaderSize); |
| |
| std::vector<uint8_t> payload(957); |
| return SendQueue::DataToSend(gen_.Ordered(payload, "BE")); |
| }); |
| |
| std::vector<std::pair<TSN, Data>> chunks_to_send = |
| queue.GetChunksToSend(now_, 1188 - 12); |
| EXPECT_THAT(chunks_to_send, ElementsAre(Pair(TSN(10), _), Pair(TSN(11), _))); |
| } |
| |
| TEST_F(RetransmissionQueueTest, AccountsNackedAbandonedChunksAsNotOutstanding) { |
| RetransmissionQueue queue = CreateQueue(); |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce([this](TimeMs, size_t) { |
| SendQueue::DataToSend dts(gen_.Ordered({1, 2, 3, 4}, "B")); |
| dts.max_retransmissions = MaxRetransmits(0); |
| return dts; |
| }) |
| .WillOnce([this](TimeMs, size_t) { |
| SendQueue::DataToSend dts(gen_.Ordered({5, 6, 7, 8}, "")); |
| dts.max_retransmissions = MaxRetransmits(0); |
| return dts; |
| }) |
| .WillOnce([this](TimeMs, size_t) { |
| SendQueue::DataToSend dts(gen_.Ordered({9, 10, 11, 12}, "")); |
| dts.max_retransmissions = MaxRetransmits(0); |
| return dts; |
| }) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| |
| // Send and ack first chunk (TSN 10) |
| std::vector<std::pair<TSN, Data>> chunks_to_send = |
| queue.GetChunksToSend(now_, 1000); |
| EXPECT_THAT(chunks_to_send, ElementsAre(Pair(TSN(10), _), Pair(TSN(11), _), |
| Pair(TSN(12), _))); |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kInFlight), // |
| Pair(TSN(11), State::kInFlight), // |
| Pair(TSN(12), State::kInFlight))); |
| EXPECT_EQ(queue.outstanding_bytes(), (16 + 4) * 3u); |
| EXPECT_EQ(queue.outstanding_items(), 3u); |
| |
| // Mark the message as lost. |
| EXPECT_CALL(producer_, Discard(IsUnordered(false), StreamID(1), MID(42))) |
| .Times(1); |
| queue.HandleT3RtxTimerExpiry(); |
| |
| EXPECT_TRUE(queue.ShouldSendForwardTsn(now_)); |
| |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kAbandoned), // |
| Pair(TSN(11), State::kAbandoned), // |
| Pair(TSN(12), State::kAbandoned))); |
| EXPECT_EQ(queue.outstanding_bytes(), 0u); |
| EXPECT_EQ(queue.outstanding_items(), 0u); |
| |
| // Now ACK those, one at a time. |
| queue.HandleSack(now_, SackChunk(TSN(10), kArwnd, {}, {})); |
| EXPECT_EQ(queue.outstanding_bytes(), 0u); |
| EXPECT_EQ(queue.outstanding_items(), 0u); |
| |
| queue.HandleSack(now_, SackChunk(TSN(11), kArwnd, {}, {})); |
| EXPECT_EQ(queue.outstanding_bytes(), 0u); |
| EXPECT_EQ(queue.outstanding_items(), 0u); |
| |
| queue.HandleSack(now_, SackChunk(TSN(12), kArwnd, {}, {})); |
| EXPECT_EQ(queue.outstanding_bytes(), 0u); |
| EXPECT_EQ(queue.outstanding_items(), 0u); |
| } |
| |
| TEST_F(RetransmissionQueueTest, ExpireFromSendQueueWhenPartiallySent) { |
| RetransmissionQueue queue = CreateQueue(); |
| DataGeneratorOptions options; |
| options.stream_id = StreamID(17); |
| options.message_id = MID(42); |
| TimeMs test_start = now_; |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce([&](TimeMs, size_t) { |
| SendQueue::DataToSend dts(gen_.Ordered({1, 2, 3, 4}, "B", options)); |
| dts.expires_at = TimeMs(test_start + DurationMs(10)); |
| return dts; |
| }) |
| .WillOnce([&](TimeMs, size_t) { |
| SendQueue::DataToSend dts(gen_.Ordered({5, 6, 7, 8}, "", options)); |
| dts.expires_at = TimeMs(test_start + DurationMs(10)); |
| return dts; |
| }) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| |
| std::vector<std::pair<TSN, Data>> chunks_to_send = |
| queue.GetChunksToSend(now_, 24); |
| EXPECT_THAT(chunks_to_send, ElementsAre(Pair(TSN(10), _))); |
| |
| EXPECT_CALL(producer_, Discard(IsUnordered(false), StreamID(17), MID(42))) |
| .WillOnce(Return(true)); |
| now_ += DurationMs(100); |
| |
| EXPECT_THAT(queue.GetChunksToSend(now_, 24), IsEmpty()); |
| |
| EXPECT_THAT( |
| queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // Initial TSN |
| Pair(TSN(10), State::kAbandoned), // Produced |
| Pair(TSN(11), State::kAbandoned), // Produced and expired |
| Pair(TSN(12), State::kAbandoned))); // Placeholder end |
| } |
| |
| TEST_F(RetransmissionQueueTest, LimitsRetransmissionsOnlyWhenNackedThreeTimes) { |
| RetransmissionQueue queue = CreateQueue(); |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce([this](TimeMs, size_t) { |
| SendQueue::DataToSend dts(gen_.Ordered({1, 2, 3, 4}, "BE")); |
| dts.max_retransmissions = MaxRetransmits(0); |
| return dts; |
| }) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| |
| EXPECT_FALSE(queue.ShouldSendForwardTsn(now_)); |
| |
| std::vector<std::pair<TSN, Data>> chunks_to_send = |
| queue.GetChunksToSend(now_, 1000); |
| EXPECT_THAT(chunks_to_send, ElementsAre(Pair(TSN(10), _), Pair(TSN(11), _), |
| Pair(TSN(12), _), Pair(TSN(13), _))); |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kInFlight), // |
| Pair(TSN(11), State::kInFlight), // |
| Pair(TSN(12), State::kInFlight), // |
| Pair(TSN(13), State::kInFlight))); |
| |
| EXPECT_FALSE(queue.ShouldSendForwardTsn(now_)); |
| |
| EXPECT_CALL(producer_, Discard(IsUnordered(false), StreamID(1), MID(42))) |
| .Times(0); |
| |
| queue.HandleSack( |
| now_, SackChunk(TSN(9), kArwnd, {SackChunk::GapAckBlock(2, 2)}, {})); |
| |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kNacked), // |
| Pair(TSN(11), State::kAcked), // |
| Pair(TSN(12), State::kInFlight), // |
| Pair(TSN(13), State::kInFlight))); |
| |
| EXPECT_FALSE(queue.ShouldSendForwardTsn(now_)); |
| |
| queue.HandleSack( |
| now_, SackChunk(TSN(9), kArwnd, {SackChunk::GapAckBlock(2, 3)}, {})); |
| |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kNacked), // |
| Pair(TSN(11), State::kAcked), // |
| Pair(TSN(12), State::kAcked), // |
| Pair(TSN(13), State::kInFlight))); |
| |
| EXPECT_FALSE(queue.ShouldSendForwardTsn(now_)); |
| |
| EXPECT_CALL(producer_, Discard(IsUnordered(false), StreamID(1), MID(42))) |
| .WillOnce(Return(false)); |
| queue.HandleSack( |
| now_, SackChunk(TSN(9), kArwnd, {SackChunk::GapAckBlock(2, 4)}, {})); |
| |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kAbandoned), // |
| Pair(TSN(11), State::kAcked), // |
| Pair(TSN(12), State::kAcked), // |
| Pair(TSN(13), State::kAcked))); |
| |
| EXPECT_TRUE(queue.ShouldSendForwardTsn(now_)); |
| } |
| |
| TEST_F(RetransmissionQueueTest, AbandonsRtxLimit2WhenNackedNineTimes) { |
| // This is a fairly long test. |
| RetransmissionQueue queue = CreateQueue(); |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce([this](TimeMs, size_t) { |
| SendQueue::DataToSend dts(gen_.Ordered({1, 2, 3, 4}, "BE")); |
| dts.max_retransmissions = MaxRetransmits(2); |
| return dts; |
| }) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| |
| EXPECT_FALSE(queue.ShouldSendForwardTsn(now_)); |
| |
| std::vector<std::pair<TSN, Data>> chunks_to_send = |
| queue.GetChunksToSend(now_, 1000); |
| EXPECT_THAT(chunks_to_send, |
| ElementsAre(Pair(TSN(10), _), Pair(TSN(11), _), Pair(TSN(12), _), |
| Pair(TSN(13), _), Pair(TSN(14), _), Pair(TSN(15), _), |
| Pair(TSN(16), _), Pair(TSN(17), _), Pair(TSN(18), _), |
| Pair(TSN(19), _))); |
| |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kInFlight), // |
| Pair(TSN(11), State::kInFlight), // |
| Pair(TSN(12), State::kInFlight), // |
| Pair(TSN(13), State::kInFlight), // |
| Pair(TSN(14), State::kInFlight), // |
| Pair(TSN(15), State::kInFlight), // |
| Pair(TSN(16), State::kInFlight), // |
| Pair(TSN(17), State::kInFlight), // |
| Pair(TSN(18), State::kInFlight), // |
| Pair(TSN(19), State::kInFlight))); |
| |
| EXPECT_CALL(producer_, Discard(IsUnordered(false), StreamID(1), MID(42))) |
| .Times(0); |
| |
| // Ack TSN [11 to 13] - three nacks for TSN(10), which will retransmit it. |
| for (int tsn = 11; tsn <= 13; ++tsn) { |
| queue.HandleSack( |
| now_, |
| SackChunk(TSN(9), kArwnd, {SackChunk::GapAckBlock(2, (tsn - 9))}, {})); |
| } |
| |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kToBeRetransmitted), // |
| Pair(TSN(11), State::kAcked), // |
| Pair(TSN(12), State::kAcked), // |
| Pair(TSN(13), State::kAcked), // |
| Pair(TSN(14), State::kInFlight), // |
| Pair(TSN(15), State::kInFlight), // |
| Pair(TSN(16), State::kInFlight), // |
| Pair(TSN(17), State::kInFlight), // |
| Pair(TSN(18), State::kInFlight), // |
| Pair(TSN(19), State::kInFlight))); |
| |
| EXPECT_THAT(queue.GetChunksToSend(now_, 1000), ElementsAre(Pair(TSN(10), _))); |
| |
| // Ack TSN [14 to 16] - three more nacks - second and last retransmission. |
| for (int tsn = 14; tsn <= 16; ++tsn) { |
| queue.HandleSack( |
| now_, |
| SackChunk(TSN(9), kArwnd, {SackChunk::GapAckBlock(2, (tsn - 9))}, {})); |
| } |
| |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kToBeRetransmitted), // |
| Pair(TSN(11), State::kAcked), // |
| Pair(TSN(12), State::kAcked), // |
| Pair(TSN(13), State::kAcked), // |
| Pair(TSN(14), State::kAcked), // |
| Pair(TSN(15), State::kAcked), // |
| Pair(TSN(16), State::kAcked), // |
| Pair(TSN(17), State::kInFlight), // |
| Pair(TSN(18), State::kInFlight), // |
| Pair(TSN(19), State::kInFlight))); |
| |
| EXPECT_THAT(queue.GetChunksToSend(now_, 1000), ElementsAre(Pair(TSN(10), _))); |
| |
| // Ack TSN [17 to 18] |
| for (int tsn = 17; tsn <= 18; ++tsn) { |
| queue.HandleSack( |
| now_, |
| SackChunk(TSN(9), kArwnd, {SackChunk::GapAckBlock(2, (tsn - 9))}, {})); |
| } |
| |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kNacked), // |
| Pair(TSN(11), State::kAcked), // |
| Pair(TSN(12), State::kAcked), // |
| Pair(TSN(13), State::kAcked), // |
| Pair(TSN(14), State::kAcked), // |
| Pair(TSN(15), State::kAcked), // |
| Pair(TSN(16), State::kAcked), // |
| Pair(TSN(17), State::kAcked), // |
| Pair(TSN(18), State::kAcked), // |
| Pair(TSN(19), State::kInFlight))); |
| |
| EXPECT_FALSE(queue.ShouldSendForwardTsn(now_)); |
| |
| // Ack TSN 19 - three more nacks for TSN 10, no more retransmissions. |
| EXPECT_CALL(producer_, Discard(IsUnordered(false), StreamID(1), MID(42))) |
| .WillOnce(Return(false)); |
| queue.HandleSack( |
| now_, SackChunk(TSN(9), kArwnd, {SackChunk::GapAckBlock(2, 10)}, {})); |
| |
| EXPECT_THAT(queue.GetChunksToSend(now_, 1000), IsEmpty()); |
| |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kAbandoned), // |
| Pair(TSN(11), State::kAcked), // |
| Pair(TSN(12), State::kAcked), // |
| Pair(TSN(13), State::kAcked), // |
| Pair(TSN(14), State::kAcked), // |
| Pair(TSN(15), State::kAcked), // |
| Pair(TSN(16), State::kAcked), // |
| Pair(TSN(17), State::kAcked), // |
| Pair(TSN(18), State::kAcked), // |
| Pair(TSN(19), State::kAcked))); |
| |
| EXPECT_TRUE(queue.ShouldSendForwardTsn(now_)); |
| } |
| |
| TEST_F(RetransmissionQueueTest, CwndRecoversWhenAcking) { |
| RetransmissionQueue queue = CreateQueue(); |
| static constexpr size_t kCwnd = 1200; |
| queue.set_cwnd(kCwnd); |
| EXPECT_EQ(queue.cwnd(), kCwnd); |
| |
| std::vector<uint8_t> payload(1000); |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce([this, payload](TimeMs, size_t) { |
| return SendQueue::DataToSend(gen_.Ordered(payload, "BE")); |
| }) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| |
| std::vector<std::pair<TSN, Data>> chunks_to_send = |
| queue.GetChunksToSend(now_, 1500); |
| EXPECT_THAT(chunks_to_send, ElementsAre(Pair(TSN(10), _))); |
| size_t serialized_size = payload.size() + DataChunk::kHeaderSize; |
| EXPECT_EQ(queue.outstanding_bytes(), serialized_size); |
| |
| queue.HandleSack(now_, SackChunk(TSN(10), kArwnd, {}, {})); |
| |
| EXPECT_EQ(queue.cwnd(), kCwnd + serialized_size); |
| } |
| |
| // Verifies that it doesn't produce tiny packets, when getting close to |
| // the full congestion window. |
| TEST_F(RetransmissionQueueTest, OnlySendsLargePacketsOnLargeCongestionWindow) { |
| RetransmissionQueue queue = CreateQueue(); |
| size_t intial_cwnd = options_.avoid_fragmentation_cwnd_mtus * options_.mtu; |
| queue.set_cwnd(intial_cwnd); |
| EXPECT_EQ(queue.cwnd(), intial_cwnd); |
| |
| // Fill the congestion window almost - leaving 500 bytes. |
| size_t chunk_size = intial_cwnd - 500; |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce([chunk_size, this](TimeMs, size_t) { |
| return SendQueue::DataToSend( |
| gen_.Ordered(std::vector<uint8_t>(chunk_size), "BE")); |
| }) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| |
| EXPECT_TRUE(queue.can_send_data()); |
| std::vector<std::pair<TSN, Data>> chunks_to_send = |
| queue.GetChunksToSend(now_, 10000); |
| EXPECT_THAT(chunks_to_send, ElementsAre(Pair(TSN(10), _))); |
| |
| // To little space left - will not send more. |
| EXPECT_FALSE(queue.can_send_data()); |
| |
| // But when the first chunk is acked, it will continue. |
| queue.HandleSack(now_, SackChunk(TSN(10), kArwnd, {}, {})); |
| |
| EXPECT_TRUE(queue.can_send_data()); |
| EXPECT_EQ(queue.outstanding_bytes(), 0u); |
| EXPECT_EQ(queue.cwnd(), intial_cwnd + kMaxMtu); |
| } |
| |
| TEST_F(RetransmissionQueueTest, AllowsSmallFragmentsOnSmallCongestionWindow) { |
| RetransmissionQueue queue = CreateQueue(); |
| size_t intial_cwnd = |
| options_.avoid_fragmentation_cwnd_mtus * options_.mtu - 1; |
| queue.set_cwnd(intial_cwnd); |
| EXPECT_EQ(queue.cwnd(), intial_cwnd); |
| |
| // Fill the congestion window almost - leaving 500 bytes. |
| size_t chunk_size = intial_cwnd - 500; |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce([chunk_size, this](TimeMs, size_t) { |
| return SendQueue::DataToSend( |
| gen_.Ordered(std::vector<uint8_t>(chunk_size), "BE")); |
| }) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| |
| EXPECT_TRUE(queue.can_send_data()); |
| std::vector<std::pair<TSN, Data>> chunks_to_send = |
| queue.GetChunksToSend(now_, 10000); |
| EXPECT_THAT(chunks_to_send, ElementsAre(Pair(TSN(10), _))); |
| |
| // With congestion window under limit, allow small packets to be created. |
| EXPECT_TRUE(queue.can_send_data()); |
| } |
| |
| TEST_F(RetransmissionQueueTest, ReadyForHandoverWhenHasNoOutstandingData) { |
| RetransmissionQueue queue = CreateQueue(); |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce(CreateChunk()) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| |
| EXPECT_THAT(GetSentPacketTSNs(queue), SizeIs(1)); |
| EXPECT_EQ( |
| queue.GetHandoverReadiness(), |
| HandoverReadinessStatus( |
| HandoverUnreadinessReason::kRetransmissionQueueOutstandingData)); |
| |
| queue.HandleSack(now_, SackChunk(TSN(10), kArwnd, {}, {})); |
| EXPECT_EQ(queue.GetHandoverReadiness(), HandoverReadinessStatus()); |
| } |
| |
| TEST_F(RetransmissionQueueTest, ReadyForHandoverWhenNothingToRetransmit) { |
| RetransmissionQueue queue = CreateQueue(); |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| EXPECT_THAT(GetSentPacketTSNs(queue), SizeIs(8)); |
| EXPECT_EQ( |
| queue.GetHandoverReadiness(), |
| HandoverReadinessStatus( |
| HandoverUnreadinessReason::kRetransmissionQueueOutstandingData)); |
| |
| // Send more chunks, but leave some chunks unacked to force retransmission |
| // after three NACKs. |
| |
| // Send 18 |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce(CreateChunk()) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| EXPECT_THAT(GetSentPacketTSNs(queue), SizeIs(1)); |
| |
| // Ack 12, 14-15, 17-18 |
| queue.HandleSack(now_, SackChunk(TSN(12), kArwnd, |
| {SackChunk::GapAckBlock(2, 3), |
| SackChunk::GapAckBlock(5, 6)}, |
| {})); |
| |
| // Send 19 |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce(CreateChunk()) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| EXPECT_THAT(GetSentPacketTSNs(queue), SizeIs(1)); |
| |
| // Ack 12, 14-15, 17-19 |
| queue.HandleSack(now_, SackChunk(TSN(12), kArwnd, |
| {SackChunk::GapAckBlock(2, 3), |
| SackChunk::GapAckBlock(5, 7)}, |
| {})); |
| |
| // Send 20 |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce(CreateChunk()) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| EXPECT_THAT(GetSentPacketTSNs(queue), SizeIs(1)); |
| |
| // Ack 12, 14-15, 17-20 |
| // This will trigger "fast retransmit" mode and only chunks 13 and 16 will be |
| // resent right now. The send queue will not even be queried. |
| queue.HandleSack(now_, SackChunk(TSN(12), kArwnd, |
| {SackChunk::GapAckBlock(2, 3), |
| SackChunk::GapAckBlock(5, 8)}, |
| {})); |
| EXPECT_EQ( |
| queue.GetHandoverReadiness(), |
| HandoverReadinessStatus() |
| .Add(HandoverUnreadinessReason::kRetransmissionQueueOutstandingData) |
| .Add(HandoverUnreadinessReason::kRetransmissionQueueFastRecovery) |
| .Add(HandoverUnreadinessReason::kRetransmissionQueueNotEmpty)); |
| |
| // Send "fast retransmit" mode chunks |
| EXPECT_CALL(producer_, Produce).Times(0); |
| EXPECT_THAT(GetSentPacketTSNs(queue), SizeIs(2)); |
| EXPECT_EQ( |
| queue.GetHandoverReadiness(), |
| HandoverReadinessStatus() |
| .Add(HandoverUnreadinessReason::kRetransmissionQueueOutstandingData) |
| .Add(HandoverUnreadinessReason::kRetransmissionQueueFastRecovery)); |
| |
| // Ack 20 to confirm the retransmission |
| queue.HandleSack(now_, SackChunk(TSN(20), kArwnd, {}, {})); |
| EXPECT_EQ(queue.GetHandoverReadiness(), HandoverReadinessStatus()); |
| } |
| |
| TEST_F(RetransmissionQueueTest, HandoverTest) { |
| RetransmissionQueue queue = CreateQueue(); |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| EXPECT_THAT(GetSentPacketTSNs(queue), SizeIs(2)); |
| queue.HandleSack(now_, SackChunk(TSN(11), kArwnd, {}, {})); |
| |
| RetransmissionQueue handedover_queue = CreateQueueByHandover(queue); |
| |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillOnce(CreateChunk()) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| EXPECT_THAT(GetSentPacketTSNs(handedover_queue), |
| testing::ElementsAre(TSN(12), TSN(13), TSN(14))); |
| |
| handedover_queue.HandleSack(now_, SackChunk(TSN(13), kArwnd, {}, {})); |
| EXPECT_THAT(handedover_queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(13), State::kAcked), // |
| Pair(TSN(14), State::kInFlight))); |
| } |
| |
| TEST_F(RetransmissionQueueTest, CanAlwaysSendOnePacket) { |
| RetransmissionQueue queue = CreateQueue(); |
| |
| // A large payload - enough to not fit two DATA in same packet. |
| size_t mtu = RoundDownTo4(options_.mtu); |
| std::vector<uint8_t> payload(mtu - 100); |
| |
| EXPECT_CALL(producer_, Produce) |
| .WillOnce([this, payload](TimeMs, size_t) { |
| return SendQueue::DataToSend(gen_.Ordered(payload, "B")); |
| }) |
| .WillOnce([this, payload](TimeMs, size_t) { |
| return SendQueue::DataToSend(gen_.Ordered(payload, "")); |
| }) |
| .WillOnce([this, payload](TimeMs, size_t) { |
| return SendQueue::DataToSend(gen_.Ordered(payload, "")); |
| }) |
| .WillOnce([this, payload](TimeMs, size_t) { |
| return SendQueue::DataToSend(gen_.Ordered(payload, "")); |
| }) |
| .WillOnce([this, payload](TimeMs, size_t) { |
| return SendQueue::DataToSend(gen_.Ordered(payload, "E")); |
| }) |
| .WillRepeatedly([](TimeMs, size_t) { return absl::nullopt; }); |
| |
| // Produce all chunks and put them in the retransmission queue. |
| std::vector<std::pair<TSN, Data>> chunks_to_send = |
| queue.GetChunksToSend(now_, 5 * mtu); |
| EXPECT_THAT(chunks_to_send, |
| ElementsAre(Pair(TSN(10), _), Pair(TSN(11), _), Pair(TSN(12), _), |
| Pair(TSN(13), _), Pair(TSN(14), _))); |
| EXPECT_THAT(queue.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kInFlight), // |
| Pair(TSN(11), State::kInFlight), // |
| Pair(TSN(12), State::kInFlight), |
| Pair(TSN(13), State::kInFlight), |
| Pair(TSN(14), State::kInFlight))); |
| |
| // Ack 12, and report an empty receiver window (the peer obviously has a |
| // tiny receive window). |
| queue.HandleSack( |
| now_, SackChunk(TSN(9), /*rwnd=*/0, {SackChunk::GapAckBlock(3, 3)}, {})); |
| |
| // Force TSN 10 to be retransmitted. |
| queue.HandleT3RtxTimerExpiry(); |
| |
| // Even if the receiver window is empty, it will allow TSN 10 to be sent. |
| EXPECT_THAT(queue.GetChunksToSend(now_, mtu), ElementsAre(Pair(TSN(10), _))); |
| |
| // But not more than that, as there now is outstanding data. |
| EXPECT_THAT(queue.GetChunksToSend(now_, mtu), IsEmpty()); |
| |
| // Don't ack any new data, and still have receiver window zero. |
| queue.HandleSack( |
| now_, SackChunk(TSN(9), /*rwnd=*/0, {SackChunk::GapAckBlock(3, 3)}, {})); |
| |
| // There is in-flight data, so new data should not be allowed to be send since |
| // the receiver window is full. |
| EXPECT_THAT(queue.GetChunksToSend(now_, mtu), IsEmpty()); |
| |
| // Ack that packet (no more in-flight data), but still report an empty |
| // receiver window. |
| queue.HandleSack( |
| now_, SackChunk(TSN(10), /*rwnd=*/0, {SackChunk::GapAckBlock(2, 2)}, {})); |
| |
| // Then TSN 11 can be sent, as there is no in-flight data. |
| EXPECT_THAT(queue.GetChunksToSend(now_, mtu), ElementsAre(Pair(TSN(11), _))); |
| EXPECT_THAT(queue.GetChunksToSend(now_, mtu), IsEmpty()); |
| |
| // Ack and recover the receiver window |
| queue.HandleSack(now_, SackChunk(TSN(12), /*rwnd=*/5 * mtu, {}, {})); |
| |
| // That will unblock sending remaining chunks. |
| EXPECT_THAT(queue.GetChunksToSend(now_, mtu), ElementsAre(Pair(TSN(13), _))); |
| EXPECT_THAT(queue.GetChunksToSend(now_, mtu), ElementsAre(Pair(TSN(14), _))); |
| EXPECT_THAT(queue.GetChunksToSend(now_, mtu), IsEmpty()); |
| } |
| |
| } // namespace |
| } // namespace dcsctp |
