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net/{batching,udprelay},wgengine/magicsock: add SO_RXQ_OVFL clientmetrics

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For the purpose of improved observability of UDP socket receive buffer
overflows on Linux.

Updates tailscale/corp#37679

Signed-off-by: Jordan Whited <jordan@tailscale.com>
This commit is contained in:
Jordan Whited
2026-03-11 13:02:09 -07:00
committed by Jordan Whited
parent 660a4608d2
commit 96dde53b43
5 changed files with 330 additions and 53 deletions
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wgengine/magicsock/rebinding_conn.go
+1 -1
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@@ -43,7 +43,7 @@ type RebindingUDPConn struct {
// disrupting surrounding code that assumes nettype.PacketConn is a
// *net.UDPConn.
func (c *RebindingUDPConn) setConnLocked(p nettype.PacketConn, network string, batchSize int) {
upc := batching.TryUpgradeToConn(p, network, batchSize)
upc := batching.TryUpgradeToConn(p, network, batchSize, "magicsock_udp_rxq_overflows")
c.pconn = upc
c.pconnAtomic.Store(&upc)
c.port = uint16(c.localAddrLocked().Port)