From f90ab60a8a5ce9663a878c7cabcc4ad66922e265 Mon Sep 17 00:00:00 2001
From: Sam Balana <sbalana@google.com>
Date: Tue, 24 Nov 2020 14:20:15 -0800
Subject: Track number of packets queued to Failed neighbors

Add a NIC-specific neighbor table statistic so we can determine how many
packets have been queued to Failed neighbors, indicating an unhealthy local
network. This change assists us to debug in-field issues where subsequent
traffic to a neighbor fails.

Fixes #4819

PiperOrigin-RevId: 344131119
---
 pkg/tcpip/stack/nic.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'pkg/tcpip/stack/nic.go')

diff --git a/pkg/tcpip/stack/nic.go b/pkg/tcpip/stack/nic.go
index 3e6ceff28..43696ba14 100644
--- a/pkg/tcpip/stack/nic.go
+++ b/pkg/tcpip/stack/nic.go
@@ -60,12 +60,14 @@ type NIC struct {
 	}
 }
 
-// NICStats includes transmitted and received stats.
+// NICStats hold statistics for a NIC.
 type NICStats struct {
 	Tx DirectionStats
 	Rx DirectionStats
 
 	DisabledRx DirectionStats
+
+	Neighbor NeighborStats
 }
 
 func makeNICStats() NICStats {
-- 
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