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Add metric to count number of segments acknowledged by DSACK.

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- Creates new metric "/tcp/segments_acked_with_dsack" to count the number of
segments acked with DSACK.
- Added check to verify the metric is getting incremented when a DSACK is sent
in the unit tests.

PiperOrigin-RevId: 386135949
This commit is contained in:
Nayana Bidari
2021-07-21 18:06:31 -07:00
committed by gVisor bot
parent bc0ab8ea0f
commit f1f746dddc
4 changed files with 56 additions and 0 deletions
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pkg/sentry/socket/netstack/netstack.go
+1
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@@ -274,6 +274,7 @@ var Metrics = tcpip.Stats{
Timeouts: mustCreateMetric("/netstack/tcp/timeouts", "Number of times RTO expired."),
ChecksumErrors: mustCreateMetric("/netstack/tcp/checksum_errors", "Number of segments dropped due to bad checksums."),
FailedPortReservations: mustCreateMetric("/netstack/tcp/failed_port_reservations", "Number of time TCP failed to reserve a port."),
SegmentsAckedWithDSACK: mustCreateMetric("/netstack/tcp/segments_acked_with_dsack", "Number of segments for which DSACK was received."),
},
UDP: tcpip.UDPStats{
PacketsReceived: mustCreateMetric("/netstack/udp/packets_received", "Number of UDP datagrams received via HandlePacket."),