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25b8ed8d9e
Add four control-plane node attributes that let us disable UDP GSO/GRO
on the magicsock UDP socket and UDP/TCP GRO on the Tailscale TUN
device.
These complement the pre-existing TS_DEBUG_DISABLE_UDP_{GRO,GSO} and
TS_TUN_DISABLE_{UDP,TCP}_GRO envknobs. They exist so we can mitigate
upstream Linux kernel regressions on a deployed fleet without
requiring a client release, after two incidents (#13041, #19777) where
buggy kernel patches landed upstream and the fix took an excessively
long time to reach downstream distros.
Knob changes are reacted to in setNetworkMapInternal / SetNetworkMap via
a comparison against a cached "last applied" value and only an actual
transition triggers work: magicsock Rebind()+ReSTUN for UDP,
ApplyGROKnobs for TUN. The TUN side is gated by buildfeatures.HasGRO and
is one-way (wireguard-go GRO disablement is sticky); re-enabling
requires a client restart.
Updates #13041
Updates #19777
Change-Id: I802993070afa659cc06809bb0bfbb7f8a0cdb273
Signed-off-by: James Tucker <james@tailscale.com>
25 lines
520 B
Go
25 lines
520 B
Go
// Copyright (c) Tailscale Inc & contributors
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// SPDX-License-Identifier: BSD-3-Clause
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//go:build !linux
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package batching
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import (
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"tailscale.com/control/controlknobs"
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"tailscale.com/types/nettype"
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)
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// TryUpgradeToConn is no-op on all platforms except linux.
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func TryUpgradeToConn(pconn nettype.PacketConn, _ string, _ int, _ string, _ *controlknobs.Knobs) nettype.PacketConn {
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return pconn
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}
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var controlMessageSize = 0
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func MinControlMessageSize() int {
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return controlMessageSize
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}
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const IdealBatchSize = 1
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