diff options
Diffstat (limited to 'pkg/tcpip')
| -rw-r--r-- | pkg/tcpip/tcpip.go | 4 | ||||
| -rw-r--r-- | pkg/tcpip/transport/tcp/snd.go | 7 |
2 files changed, 11 insertions, 0 deletions
diff --git a/pkg/tcpip/tcpip.go b/pkg/tcpip/tcpip.go index 8f2658f64..55683b4fb 100644 --- a/pkg/tcpip/tcpip.go +++ b/pkg/tcpip/tcpip.go @@ -1845,6 +1845,10 @@ type TCPStats struct { // FailedPortReservations is the number of times TCP failed to reserve // a port. FailedPortReservations *StatCounter + + // SegmentsAckedWithDSACK is the number of segments acknowledged with + // DSACK. + SegmentsAckedWithDSACK *StatCounter } // UDPStats collects UDP-specific stats. diff --git a/pkg/tcpip/transport/tcp/snd.go b/pkg/tcpip/transport/tcp/snd.go index 72d58dcff..92a66f17e 100644 --- a/pkg/tcpip/transport/tcp/snd.go +++ b/pkg/tcpip/transport/tcp/snd.go @@ -1154,6 +1154,13 @@ func (s *sender) walkSACK(rcvdSeg *segment) { idx := 0 n := len(rcvdSeg.parsedOptions.SACKBlocks) if checkDSACK(rcvdSeg) { + dsackBlock := rcvdSeg.parsedOptions.SACKBlocks[0] + numDSACK := uint64(dsackBlock.End-dsackBlock.Start) / uint64(s.MaxPayloadSize) + // numDSACK can be zero when DSACK is sent for subsegments. + if numDSACK < 1 { + numDSACK = 1 + } + s.ep.stack.Stats().TCP.SegmentsAckedWithDSACK.IncrementBy(numDSACK) s.rc.setDSACKSeen(true) idx = 1 n-- |