| /* |
| * 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/outstanding_data.h" |
| |
| #include <vector> |
| |
| #include "absl/types/optional.h" |
| #include "net/dcsctp/common/math.h" |
| #include "net/dcsctp/common/sequence_numbers.h" |
| #include "net/dcsctp/packet/chunk/data_chunk.h" |
| #include "net/dcsctp/packet/chunk/forward_tsn_chunk.h" |
| #include "net/dcsctp/public/types.h" |
| #include "net/dcsctp/testing/data_generator.h" |
| #include "net/dcsctp/testing/testing_macros.h" |
| #include "rtc_base/gunit.h" |
| #include "test/gmock.h" |
| |
| namespace dcsctp { |
| namespace { |
| using ::testing::MockFunction; |
| using State = ::dcsctp::OutstandingData::State; |
| using ::testing::_; |
| using ::testing::ElementsAre; |
| using ::testing::IsEmpty; |
| using ::testing::Pair; |
| using ::testing::Return; |
| using ::testing::StrictMock; |
| |
| constexpr TimeMs kNow(42); |
| |
| class OutstandingDataTest : public testing::Test { |
| protected: |
| OutstandingDataTest() |
| : gen_(MID(42)), |
| buf_(DataChunk::kHeaderSize, |
| unwrapper_.Unwrap(TSN(10)), |
| unwrapper_.Unwrap(TSN(9)), |
| on_discard_.AsStdFunction()) {} |
| |
| UnwrappedTSN::Unwrapper unwrapper_; |
| DataGenerator gen_; |
| StrictMock<MockFunction<bool(IsUnordered, StreamID, MID)>> on_discard_; |
| OutstandingData buf_; |
| }; |
| |
| TEST_F(OutstandingDataTest, HasInitialState) { |
| EXPECT_TRUE(buf_.empty()); |
| EXPECT_EQ(buf_.outstanding_bytes(), 0u); |
| EXPECT_EQ(buf_.outstanding_items(), 0u); |
| EXPECT_FALSE(buf_.has_data_to_be_retransmitted()); |
| EXPECT_EQ(buf_.last_cumulative_tsn_ack().Wrap(), TSN(9)); |
| EXPECT_EQ(buf_.next_tsn().Wrap(), TSN(10)); |
| EXPECT_EQ(buf_.highest_outstanding_tsn().Wrap(), TSN(9)); |
| EXPECT_THAT(buf_.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked))); |
| EXPECT_FALSE(buf_.ShouldSendForwardTsn()); |
| } |
| |
| TEST_F(OutstandingDataTest, InsertChunk) { |
| ASSERT_HAS_VALUE_AND_ASSIGN( |
| UnwrappedTSN tsn, |
| buf_.Insert(gen_.Ordered({1}, "BE"), MaxRetransmits::NoLimit(), kNow, |
| TimeMs::InfiniteFuture())); |
| |
| EXPECT_EQ(tsn.Wrap(), TSN(10)); |
| |
| EXPECT_EQ(buf_.outstanding_bytes(), DataChunk::kHeaderSize + RoundUpTo4(1)); |
| EXPECT_EQ(buf_.outstanding_items(), 1u); |
| EXPECT_FALSE(buf_.has_data_to_be_retransmitted()); |
| EXPECT_EQ(buf_.last_cumulative_tsn_ack().Wrap(), TSN(9)); |
| EXPECT_EQ(buf_.next_tsn().Wrap(), TSN(11)); |
| EXPECT_EQ(buf_.highest_outstanding_tsn().Wrap(), TSN(10)); |
| EXPECT_THAT(buf_.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), |
| Pair(TSN(10), State::kInFlight))); |
| } |
| |
| TEST_F(OutstandingDataTest, AcksSingleChunk) { |
| buf_.Insert(gen_.Ordered({1}, "BE"), MaxRetransmits::NoLimit(), kNow, |
| TimeMs::InfiniteFuture()); |
| OutstandingData::AckInfo ack = |
| buf_.HandleSack(unwrapper_.Unwrap(TSN(10)), {}, false); |
| |
| EXPECT_EQ(ack.bytes_acked, DataChunk::kHeaderSize + RoundUpTo4(1)); |
| EXPECT_EQ(ack.highest_tsn_acked.Wrap(), TSN(10)); |
| EXPECT_FALSE(ack.has_packet_loss); |
| |
| EXPECT_EQ(buf_.outstanding_bytes(), 0u); |
| EXPECT_EQ(buf_.outstanding_items(), 0u); |
| EXPECT_FALSE(buf_.has_data_to_be_retransmitted()); |
| EXPECT_EQ(buf_.last_cumulative_tsn_ack().Wrap(), TSN(10)); |
| EXPECT_EQ(buf_.next_tsn().Wrap(), TSN(11)); |
| EXPECT_EQ(buf_.highest_outstanding_tsn().Wrap(), TSN(10)); |
| EXPECT_THAT(buf_.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(10), State::kAcked))); |
| } |
| |
| TEST_F(OutstandingDataTest, AcksPreviousChunkDoesntUpdate) { |
| buf_.Insert(gen_.Ordered({1}, "BE"), MaxRetransmits::NoLimit(), kNow, |
| TimeMs::InfiniteFuture()); |
| buf_.HandleSack(unwrapper_.Unwrap(TSN(9)), {}, false); |
| |
| EXPECT_EQ(buf_.outstanding_bytes(), DataChunk::kHeaderSize + RoundUpTo4(1)); |
| EXPECT_EQ(buf_.outstanding_items(), 1u); |
| EXPECT_FALSE(buf_.has_data_to_be_retransmitted()); |
| EXPECT_EQ(buf_.last_cumulative_tsn_ack().Wrap(), TSN(9)); |
| EXPECT_EQ(buf_.next_tsn().Wrap(), TSN(11)); |
| EXPECT_EQ(buf_.highest_outstanding_tsn().Wrap(), TSN(10)); |
| EXPECT_THAT(buf_.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), |
| Pair(TSN(10), State::kInFlight))); |
| } |
| |
| TEST_F(OutstandingDataTest, AcksAndNacksWithGapAckBlocks) { |
| buf_.Insert(gen_.Ordered({1}, "B"), MaxRetransmits::NoLimit(), kNow, |
| TimeMs::InfiniteFuture()); |
| buf_.Insert(gen_.Ordered({1}, "E"), MaxRetransmits::NoLimit(), kNow, |
| TimeMs::InfiniteFuture()); |
| |
| std::vector<SackChunk::GapAckBlock> gab = {SackChunk::GapAckBlock(2, 2)}; |
| OutstandingData::AckInfo ack = |
| buf_.HandleSack(unwrapper_.Unwrap(TSN(9)), gab, false); |
| EXPECT_EQ(ack.bytes_acked, DataChunk::kHeaderSize + RoundUpTo4(1)); |
| EXPECT_EQ(ack.highest_tsn_acked.Wrap(), TSN(11)); |
| EXPECT_FALSE(ack.has_packet_loss); |
| |
| EXPECT_EQ(buf_.outstanding_bytes(), 0u); |
| EXPECT_EQ(buf_.outstanding_items(), 0u); |
| EXPECT_FALSE(buf_.has_data_to_be_retransmitted()); |
| EXPECT_EQ(buf_.last_cumulative_tsn_ack().Wrap(), TSN(9)); |
| EXPECT_EQ(buf_.next_tsn().Wrap(), TSN(12)); |
| EXPECT_EQ(buf_.highest_outstanding_tsn().Wrap(), TSN(11)); |
| EXPECT_THAT(buf_.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kNacked), // |
| Pair(TSN(11), State::kAcked))); |
| } |
| |
| TEST_F(OutstandingDataTest, NacksThreeTimesWithSameTsnDoesntRetransmit) { |
| buf_.Insert(gen_.Ordered({1}, "B"), MaxRetransmits::NoLimit(), kNow, |
| TimeMs::InfiniteFuture()); |
| buf_.Insert(gen_.Ordered({1}, "E"), MaxRetransmits::NoLimit(), kNow, |
| TimeMs::InfiniteFuture()); |
| |
| std::vector<SackChunk::GapAckBlock> gab1 = {SackChunk::GapAckBlock(2, 2)}; |
| EXPECT_FALSE( |
| buf_.HandleSack(unwrapper_.Unwrap(TSN(9)), gab1, false).has_packet_loss); |
| EXPECT_FALSE(buf_.has_data_to_be_retransmitted()); |
| |
| EXPECT_FALSE( |
| buf_.HandleSack(unwrapper_.Unwrap(TSN(9)), gab1, false).has_packet_loss); |
| EXPECT_FALSE(buf_.has_data_to_be_retransmitted()); |
| |
| EXPECT_FALSE( |
| buf_.HandleSack(unwrapper_.Unwrap(TSN(9)), gab1, false).has_packet_loss); |
| EXPECT_FALSE(buf_.has_data_to_be_retransmitted()); |
| |
| EXPECT_THAT(buf_.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kNacked), // |
| Pair(TSN(11), State::kAcked))); |
| } |
| |
| TEST_F(OutstandingDataTest, NacksThreeTimesResultsInRetransmission) { |
| buf_.Insert(gen_.Ordered({1}, "B"), MaxRetransmits::NoLimit(), kNow, |
| TimeMs::InfiniteFuture()); |
| buf_.Insert(gen_.Ordered({1}, ""), MaxRetransmits::NoLimit(), kNow, |
| TimeMs::InfiniteFuture()); |
| buf_.Insert(gen_.Ordered({1}, ""), MaxRetransmits::NoLimit(), kNow, |
| TimeMs::InfiniteFuture()); |
| buf_.Insert(gen_.Ordered({1}, "E"), MaxRetransmits::NoLimit(), kNow, |
| TimeMs::InfiniteFuture()); |
| |
| std::vector<SackChunk::GapAckBlock> gab1 = {SackChunk::GapAckBlock(2, 2)}; |
| EXPECT_FALSE( |
| buf_.HandleSack(unwrapper_.Unwrap(TSN(9)), gab1, false).has_packet_loss); |
| EXPECT_FALSE(buf_.has_data_to_be_retransmitted()); |
| |
| std::vector<SackChunk::GapAckBlock> gab2 = {SackChunk::GapAckBlock(2, 3)}; |
| EXPECT_FALSE( |
| buf_.HandleSack(unwrapper_.Unwrap(TSN(9)), gab2, false).has_packet_loss); |
| EXPECT_FALSE(buf_.has_data_to_be_retransmitted()); |
| |
| std::vector<SackChunk::GapAckBlock> gab3 = {SackChunk::GapAckBlock(2, 4)}; |
| OutstandingData::AckInfo ack = |
| buf_.HandleSack(unwrapper_.Unwrap(TSN(9)), gab3, false); |
| EXPECT_EQ(ack.bytes_acked, DataChunk::kHeaderSize + RoundUpTo4(1)); |
| EXPECT_EQ(ack.highest_tsn_acked.Wrap(), TSN(13)); |
| EXPECT_TRUE(ack.has_packet_loss); |
| |
| EXPECT_TRUE(buf_.has_data_to_be_retransmitted()); |
| |
| EXPECT_THAT(buf_.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))); |
| |
| EXPECT_THAT(buf_.GetChunksToBeFastRetransmitted(1000), |
| ElementsAre(Pair(TSN(10), _))); |
| EXPECT_THAT(buf_.GetChunksToBeRetransmitted(1000), IsEmpty()); |
| } |
| |
| TEST_F(OutstandingDataTest, NacksThreeTimesResultsInAbandoning) { |
| static constexpr MaxRetransmits kMaxRetransmissions(0); |
| buf_.Insert(gen_.Ordered({1}, "B"), kMaxRetransmissions, kNow, |
| TimeMs::InfiniteFuture()); |
| buf_.Insert(gen_.Ordered({1}, ""), kMaxRetransmissions, kNow, |
| TimeMs::InfiniteFuture()); |
| buf_.Insert(gen_.Ordered({1}, ""), kMaxRetransmissions, kNow, |
| TimeMs::InfiniteFuture()); |
| buf_.Insert(gen_.Ordered({1}, "E"), kMaxRetransmissions, kNow, |
| TimeMs::InfiniteFuture()); |
| |
| std::vector<SackChunk::GapAckBlock> gab1 = {SackChunk::GapAckBlock(2, 2)}; |
| EXPECT_FALSE( |
| buf_.HandleSack(unwrapper_.Unwrap(TSN(9)), gab1, false).has_packet_loss); |
| EXPECT_FALSE(buf_.has_data_to_be_retransmitted()); |
| |
| std::vector<SackChunk::GapAckBlock> gab2 = {SackChunk::GapAckBlock(2, 3)}; |
| EXPECT_FALSE( |
| buf_.HandleSack(unwrapper_.Unwrap(TSN(9)), gab2, false).has_packet_loss); |
| EXPECT_FALSE(buf_.has_data_to_be_retransmitted()); |
| |
| EXPECT_CALL(on_discard_, Call(IsUnordered(false), StreamID(1), MID(42))) |
| .WillOnce(Return(false)); |
| std::vector<SackChunk::GapAckBlock> gab3 = {SackChunk::GapAckBlock(2, 4)}; |
| OutstandingData::AckInfo ack = |
| buf_.HandleSack(unwrapper_.Unwrap(TSN(9)), gab3, false); |
| EXPECT_EQ(ack.bytes_acked, DataChunk::kHeaderSize + RoundUpTo4(1)); |
| EXPECT_EQ(ack.highest_tsn_acked.Wrap(), TSN(13)); |
| EXPECT_TRUE(ack.has_packet_loss); |
| |
| EXPECT_FALSE(buf_.has_data_to_be_retransmitted()); |
| EXPECT_EQ(buf_.next_tsn().Wrap(), TSN(14)); |
| EXPECT_THAT(buf_.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::kAbandoned))); |
| } |
| |
| TEST_F(OutstandingDataTest, NacksThreeTimesResultsInAbandoningWithPlaceholder) { |
| static constexpr MaxRetransmits kMaxRetransmissions(0); |
| buf_.Insert(gen_.Ordered({1}, "B"), kMaxRetransmissions, kNow, |
| TimeMs::InfiniteFuture()); |
| buf_.Insert(gen_.Ordered({1}, ""), kMaxRetransmissions, kNow, |
| TimeMs::InfiniteFuture()); |
| buf_.Insert(gen_.Ordered({1}, ""), kMaxRetransmissions, kNow, |
| TimeMs::InfiniteFuture()); |
| buf_.Insert(gen_.Ordered({1}, ""), kMaxRetransmissions, kNow, |
| TimeMs::InfiniteFuture()); |
| |
| std::vector<SackChunk::GapAckBlock> gab1 = {SackChunk::GapAckBlock(2, 2)}; |
| EXPECT_FALSE( |
| buf_.HandleSack(unwrapper_.Unwrap(TSN(9)), gab1, false).has_packet_loss); |
| EXPECT_FALSE(buf_.has_data_to_be_retransmitted()); |
| |
| std::vector<SackChunk::GapAckBlock> gab2 = {SackChunk::GapAckBlock(2, 3)}; |
| EXPECT_FALSE( |
| buf_.HandleSack(unwrapper_.Unwrap(TSN(9)), gab2, false).has_packet_loss); |
| EXPECT_FALSE(buf_.has_data_to_be_retransmitted()); |
| |
| EXPECT_CALL(on_discard_, Call(IsUnordered(false), StreamID(1), MID(42))) |
| .WillOnce(Return(true)); |
| std::vector<SackChunk::GapAckBlock> gab3 = {SackChunk::GapAckBlock(2, 4)}; |
| OutstandingData::AckInfo ack = |
| buf_.HandleSack(unwrapper_.Unwrap(TSN(9)), gab3, false); |
| EXPECT_EQ(ack.bytes_acked, DataChunk::kHeaderSize + RoundUpTo4(1)); |
| EXPECT_EQ(ack.highest_tsn_acked.Wrap(), TSN(13)); |
| EXPECT_TRUE(ack.has_packet_loss); |
| |
| EXPECT_FALSE(buf_.has_data_to_be_retransmitted()); |
| EXPECT_EQ(buf_.next_tsn().Wrap(), TSN(15)); |
| EXPECT_THAT(buf_.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::kAbandoned), // |
| Pair(TSN(14), State::kAbandoned))); |
| } |
| |
| TEST_F(OutstandingDataTest, ExpiresChunkBeforeItIsInserted) { |
| static constexpr TimeMs kExpiresAt = kNow + DurationMs(1); |
| EXPECT_TRUE(buf_.Insert(gen_.Ordered({1}, "B"), MaxRetransmits::NoLimit(), |
| kNow, kExpiresAt) |
| .has_value()); |
| EXPECT_TRUE(buf_.Insert(gen_.Ordered({1}, ""), MaxRetransmits::NoLimit(), |
| kNow + DurationMs(0), kExpiresAt) |
| .has_value()); |
| |
| EXPECT_CALL(on_discard_, Call(IsUnordered(false), StreamID(1), MID(42))) |
| .WillOnce(Return(false)); |
| EXPECT_FALSE(buf_.Insert(gen_.Ordered({1}, "E"), MaxRetransmits::NoLimit(), |
| kNow + DurationMs(1), kExpiresAt) |
| .has_value()); |
| |
| EXPECT_FALSE(buf_.has_data_to_be_retransmitted()); |
| EXPECT_EQ(buf_.last_cumulative_tsn_ack().Wrap(), TSN(9)); |
| EXPECT_EQ(buf_.next_tsn().Wrap(), TSN(13)); |
| EXPECT_EQ(buf_.highest_outstanding_tsn().Wrap(), TSN(12)); |
| EXPECT_THAT(buf_.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kAbandoned), // |
| Pair(TSN(11), State::kAbandoned), |
| Pair(TSN(12), State::kAbandoned))); |
| } |
| |
| TEST_F(OutstandingDataTest, CanGenerateForwardTsn) { |
| static constexpr MaxRetransmits kMaxRetransmissions(0); |
| buf_.Insert(gen_.Ordered({1}, "B"), kMaxRetransmissions, kNow, |
| TimeMs::InfiniteFuture()); |
| buf_.Insert(gen_.Ordered({1}, ""), kMaxRetransmissions, kNow, |
| TimeMs::InfiniteFuture()); |
| buf_.Insert(gen_.Ordered({1}, "E"), kMaxRetransmissions, kNow, |
| TimeMs::InfiniteFuture()); |
| |
| EXPECT_CALL(on_discard_, Call(IsUnordered(false), StreamID(1), MID(42))) |
| .WillOnce(Return(false)); |
| buf_.NackAll(); |
| |
| EXPECT_FALSE(buf_.has_data_to_be_retransmitted()); |
| EXPECT_THAT(buf_.GetChunkStatesForTesting(), |
| ElementsAre(Pair(TSN(9), State::kAcked), // |
| Pair(TSN(10), State::kAbandoned), // |
| Pair(TSN(11), State::kAbandoned), |
| Pair(TSN(12), State::kAbandoned))); |
| |
| EXPECT_TRUE(buf_.ShouldSendForwardTsn()); |
| ForwardTsnChunk chunk = buf_.CreateForwardTsn(); |
| EXPECT_EQ(chunk.new_cumulative_tsn(), TSN(12)); |
| } |
| |
| TEST_F(OutstandingDataTest, AckWithGapBlocksFromRFC4960Section334) { |
| buf_.Insert(gen_.Ordered({1}, "B"), MaxRetransmits::NoLimit(), kNow, |
| TimeMs::InfiniteFuture()); |
| buf_.Insert(gen_.Ordered({1}, ""), MaxRetransmits::NoLimit(), kNow, |
| TimeMs::InfiniteFuture()); |
| buf_.Insert(gen_.Ordered({1}, ""), MaxRetransmits::NoLimit(), kNow, |
| TimeMs::InfiniteFuture()); |
| buf_.Insert(gen_.Ordered({1}, ""), MaxRetransmits::NoLimit(), kNow, |
| TimeMs::InfiniteFuture()); |
| buf_.Insert(gen_.Ordered({1}, ""), MaxRetransmits::NoLimit(), kNow, |
| TimeMs::InfiniteFuture()); |
| buf_.Insert(gen_.Ordered({1}, ""), MaxRetransmits::NoLimit(), kNow, |
| TimeMs::InfiniteFuture()); |
| buf_.Insert(gen_.Ordered({1}, ""), MaxRetransmits::NoLimit(), kNow, |
| TimeMs::InfiniteFuture()); |
| buf_.Insert(gen_.Ordered({1}, "E"), MaxRetransmits::NoLimit(), kNow, |
| TimeMs::InfiniteFuture()); |
| |
| EXPECT_THAT(buf_.GetChunkStatesForTesting(), |
| testing::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))); |
| |
| std::vector<SackChunk::GapAckBlock> gab = {SackChunk::GapAckBlock(2, 3), |
| SackChunk::GapAckBlock(5, 5)}; |
| buf_.HandleSack(unwrapper_.Unwrap(TSN(12)), gab, false); |
| |
| EXPECT_THAT(buf_.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(OutstandingDataTest, MeasureRTT) { |
| buf_.Insert(gen_.Ordered({1}, "BE"), MaxRetransmits::NoLimit(), kNow, |
| TimeMs::InfiniteFuture()); |
| buf_.Insert(gen_.Ordered({1}, "BE"), MaxRetransmits::NoLimit(), |
| kNow + DurationMs(1), TimeMs::InfiniteFuture()); |
| buf_.Insert(gen_.Ordered({1}, "BE"), MaxRetransmits::NoLimit(), |
| kNow + DurationMs(2), TimeMs::InfiniteFuture()); |
| |
| static constexpr DurationMs kDuration(123); |
| ASSERT_HAS_VALUE_AND_ASSIGN( |
| DurationMs duration, |
| buf_.MeasureRTT(kNow + kDuration, unwrapper_.Unwrap(TSN(11)))); |
| |
| EXPECT_EQ(duration, kDuration - DurationMs(1)); |
| } |
| |
| TEST_F(OutstandingDataTest, MustRetransmitBeforeGettingNackedAgain) { |
| // This test case verifies that a chunk that has been nacked, and scheduled to |
| // be retransmitted, doesn't get nacked again until it has been actually sent |
| // on the wire. |
| |
| static constexpr MaxRetransmits kOneRetransmission(1); |
| for (int tsn = 10; tsn <= 20; ++tsn) { |
| buf_.Insert(gen_.Ordered({1}, tsn == 10 ? "B" : tsn == 20 ? "E" : ""), |
| kOneRetransmission, kNow, TimeMs::InfiniteFuture()); |
| } |
| |
| std::vector<SackChunk::GapAckBlock> gab1 = {SackChunk::GapAckBlock(2, 2)}; |
| EXPECT_FALSE( |
| buf_.HandleSack(unwrapper_.Unwrap(TSN(9)), gab1, false).has_packet_loss); |
| EXPECT_FALSE(buf_.has_data_to_be_retransmitted()); |
| |
| std::vector<SackChunk::GapAckBlock> gab2 = {SackChunk::GapAckBlock(2, 3)}; |
| EXPECT_FALSE( |
| buf_.HandleSack(unwrapper_.Unwrap(TSN(9)), gab2, false).has_packet_loss); |
| EXPECT_FALSE(buf_.has_data_to_be_retransmitted()); |
| |
| std::vector<SackChunk::GapAckBlock> gab3 = {SackChunk::GapAckBlock(2, 4)}; |
| OutstandingData::AckInfo ack = |
| buf_.HandleSack(unwrapper_.Unwrap(TSN(9)), gab3, false); |
| EXPECT_TRUE(ack.has_packet_loss); |
| EXPECT_TRUE(buf_.has_data_to_be_retransmitted()); |
| |
| // Don't call GetChunksToBeRetransmitted yet - simulate that the congestion |
| // window doesn't allow it to be retransmitted yet. It does however get more |
| // SACKs indicating packet loss. |
| |
| std::vector<SackChunk::GapAckBlock> gab4 = {SackChunk::GapAckBlock(2, 5)}; |
| EXPECT_FALSE( |
| buf_.HandleSack(unwrapper_.Unwrap(TSN(9)), gab4, false).has_packet_loss); |
| EXPECT_TRUE(buf_.has_data_to_be_retransmitted()); |
| |
| std::vector<SackChunk::GapAckBlock> gab5 = {SackChunk::GapAckBlock(2, 6)}; |
| EXPECT_FALSE( |
| buf_.HandleSack(unwrapper_.Unwrap(TSN(9)), gab5, false).has_packet_loss); |
| EXPECT_TRUE(buf_.has_data_to_be_retransmitted()); |
| |
| std::vector<SackChunk::GapAckBlock> gab6 = {SackChunk::GapAckBlock(2, 7)}; |
| OutstandingData::AckInfo ack2 = |
| buf_.HandleSack(unwrapper_.Unwrap(TSN(9)), gab6, false); |
| |
| EXPECT_FALSE(ack2.has_packet_loss); |
| EXPECT_TRUE(buf_.has_data_to_be_retransmitted()); |
| |
| // Now it's retransmitted. |
| EXPECT_THAT(buf_.GetChunksToBeFastRetransmitted(1000), |
| ElementsAre(Pair(TSN(10), _))); |
| EXPECT_THAT(buf_.GetChunksToBeRetransmitted(1000), IsEmpty()); |
| |
| // And obviously lost, as it will get NACKed and abandoned. |
| std::vector<SackChunk::GapAckBlock> gab7 = {SackChunk::GapAckBlock(2, 8)}; |
| EXPECT_FALSE( |
| buf_.HandleSack(unwrapper_.Unwrap(TSN(9)), gab7, false).has_packet_loss); |
| EXPECT_FALSE(buf_.has_data_to_be_retransmitted()); |
| |
| std::vector<SackChunk::GapAckBlock> gab8 = {SackChunk::GapAckBlock(2, 9)}; |
| EXPECT_FALSE( |
| buf_.HandleSack(unwrapper_.Unwrap(TSN(9)), gab8, false).has_packet_loss); |
| EXPECT_FALSE(buf_.has_data_to_be_retransmitted()); |
| |
| EXPECT_CALL(on_discard_, Call(IsUnordered(false), StreamID(1), MID(42))) |
| .WillOnce(Return(false)); |
| |
| std::vector<SackChunk::GapAckBlock> gab9 = {SackChunk::GapAckBlock(2, 10)}; |
| OutstandingData::AckInfo ack3 = |
| buf_.HandleSack(unwrapper_.Unwrap(TSN(9)), gab9, false); |
| |
| EXPECT_TRUE(ack3.has_packet_loss); |
| EXPECT_FALSE(buf_.has_data_to_be_retransmitted()); |
| } |
| |
| } // namespace |
| } // namespace dcsctp |
