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stop appending to a GSO batch when the ECN marking changes

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This commit is contained in:
Marten Seemann 2023-09-01 18:12:22 +07:00
parent f9cfa248da
commit b6ce91bfe7
2 changed files with 50 additions and 7 deletions
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10
connection.go
View file

@ -1911,9 +1911,9 @@ func (s *connection) sendPacketsWithGSO(now time.Time) error {
buf := getLargePacketBuffer()
maxSize := s.mtuDiscoverer.CurrentSize()
ecn := s.sentPacketHandler.ECNMode(true)
for {
var dontSendMore bool
ecn := s.sentPacketHandler.ECNMode(true)
size, err := s.appendOneShortHeaderPacket(buf, maxSize, ecn, now)
if err != nil {
if err != errNothingToPack {
@ -1936,11 +1936,15 @@ func (s *connection) sendPacketsWithGSO(now time.Time) error {
}
}
// Don't send more packets in this batch if they require a different ECN marking than the previous ones.
nextECN := s.sentPacketHandler.ECNMode(true)
// Append another packet if
// 1. The congestion controller and pacer allow sending more
// 2. The last packet appended was a full-size packet
// 3. We still have enough space for another full-size packet in the buffer
if !dontSendMore && size == maxSize && buf.Len()+maxSize <= buf.Cap() {
// 3. The next packet will have the same ECN marking
// 4. We still have enough space for another full-size packet in the buffer
if !dontSendMore && size == maxSize && nextECN == ecn && buf.Len()+maxSize <= buf.Cap() {
continue
}

47
connection_test.go
View file

@ -1451,7 +1451,7 @@ var _ = Describe("Connection", func() {
It("sends multiple packets one by one immediately, with GSO", func() {
enableGSO()
sph.EXPECT().SentPacket(gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any()).Times(2)
sph.EXPECT().ECNMode(true).Times(3)
sph.EXPECT().ECNMode(true).Return(protocol.ECT1).Times(4)
sph.EXPECT().SendMode(gomock.Any()).Return(ackhandler.SendAny).Times(3)
payload1 := make([]byte, conn.mtuDiscoverer.CurrentSize())
rand.Read(payload1)
@ -1476,20 +1476,59 @@ var _ = Describe("Connection", func() {
It("stops appending packets when a smaller packet is packed, with GSO", func() {
enableGSO()
sph.EXPECT().SentPacket(gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any()).Times(2)
sph.EXPECT().SendMode(gomock.Any()).Return(ackhandler.SendAny).Times(2)
sph.EXPECT().ECNMode(true).Times(2)
sph.EXPECT().SentPacket(gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any()).Times(3)
sph.EXPECT().SendMode(gomock.Any()).Return(ackhandler.SendAny).Times(3)
sph.EXPECT().SendMode(gomock.Any()).Return(ackhandler.SendNone)
sph.EXPECT().ECNMode(true).Times(4)
payload1 := make([]byte, conn.mtuDiscoverer.CurrentSize())
rand.Read(payload1)
payload2 := make([]byte, conn.mtuDiscoverer.CurrentSize()-1)
rand.Read(payload2)
payload3 := make([]byte, conn.mtuDiscoverer.CurrentSize())
rand.Read(payload3)
expectAppendPacket(packer, shortHeaderPacket{PacketNumber: 10}, payload1)
expectAppendPacket(packer, shortHeaderPacket{PacketNumber: 11}, payload2)
expectAppendPacket(packer, shortHeaderPacket{PacketNumber: 12}, payload3)
sender.EXPECT().WouldBlock().AnyTimes()
sender.EXPECT().Send(gomock.Any(), uint16(conn.mtuDiscoverer.CurrentSize()), gomock.Any()).Do(func(b *packetBuffer, _ uint16, _ protocol.ECN) {
Expect(b.Data).To(Equal(append(payload1, payload2...)))
})
sender.EXPECT().Send(gomock.Any(), uint16(conn.mtuDiscoverer.CurrentSize()), gomock.Any()).Do(func(b *packetBuffer, _ uint16, _ protocol.ECN) {
Expect(b.Data).To(Equal(payload3))
})
go func() {
defer GinkgoRecover()
cryptoSetup.EXPECT().StartHandshake().MaxTimes(1)
cryptoSetup.EXPECT().NextEvent().Return(handshake.Event{Kind: handshake.EventNoEvent})
conn.run()
}()
conn.scheduleSending()
time.Sleep(50 * time.Millisecond) // make sure that only 2 packets are sent
})
It("stops appending packets when the ECN marking changes, with GSO", func() {
enableGSO()
sph.EXPECT().SentPacket(gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any()).Times(3)
sph.EXPECT().SendMode(gomock.Any()).Return(ackhandler.SendAny).Times(3)
sph.EXPECT().SendMode(gomock.Any()).Return(ackhandler.SendNone)
sph.EXPECT().ECNMode(true).Return(protocol.ECT1).Times(2)
sph.EXPECT().ECNMode(true).Return(protocol.ECT0).Times(2)
payload1 := make([]byte, conn.mtuDiscoverer.CurrentSize())
rand.Read(payload1)
payload2 := make([]byte, conn.mtuDiscoverer.CurrentSize())
rand.Read(payload2)
payload3 := make([]byte, conn.mtuDiscoverer.CurrentSize())
rand.Read(payload3)
expectAppendPacket(packer, shortHeaderPacket{PacketNumber: 10}, payload1)
expectAppendPacket(packer, shortHeaderPacket{PacketNumber: 11}, payload2)
expectAppendPacket(packer, shortHeaderPacket{PacketNumber: 11}, payload3)
sender.EXPECT().WouldBlock().AnyTimes()
sender.EXPECT().Send(gomock.Any(), uint16(conn.mtuDiscoverer.CurrentSize()), gomock.Any()).Do(func(b *packetBuffer, _ uint16, _ protocol.ECN) {
Expect(b.Data).To(Equal(append(payload1, payload2...)))
})
sender.EXPECT().Send(gomock.Any(), uint16(conn.mtuDiscoverer.CurrentSize()), gomock.Any()).Do(func(b *packetBuffer, _ uint16, _ protocol.ECN) {
Expect(b.Data).To(Equal(payload3))
})
go func() {
defer GinkgoRecover()
cryptoSetup.EXPECT().StartHandshake().MaxTimes(1)