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tun: add method for disabling TCP GRO on Linux

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torvalds/linux@e269d79c7d broke virtio_net
TCP & UDP GRO causing GRO writes to return EINVAL. The bug was then
resolved later in
torvalds/linux@89add40066. The offending
commit was pulled into various LTS releases.

Updates tailscale/tailscale#13041

Signed-off-by: Jordan Whited <jordan@tailscale.com>
This commit is contained in:
Jordan Whited 2024-09-04 12:17:44 -07:00 • committed by Jordan Whited
parent 71393c576b
commit 799c1978fa
4 changed files with 114 additions and 54 deletions
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23
tun/tun.go
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@ -52,10 +52,25 @@ type Device interface {
BatchSize() int
}
type LinuxDevice interface {
// GRODevice is a Device extended with methods for disabling GRO. Certain OS
// versions may have offload bugs. Where these bugs negatively impact throughput
// or break connectivity entirely we can use these methods to disable the
// related offload.
//
// Linux has the following known, GRO bugs.
//
// torvalds/linux@e269d79c7d35aa3808b1f3c1737d63dab504ddc8 broke virtio_net
// TCP & UDP GRO causing GRO writes to return EINVAL. The bug was then
// resolved later in
// torvalds/linux@89add40066f9ed9abe5f7f886fe5789ff7e0c50e. The offending
// commit was pulled into various LTS releases.
//
// UDP GRO writes end up blackholing/dropping packets destined for a
// vxlan/geneve interface on kernel versions prior to 6.8.5.
type GRODevice interface {
Device
// DisableUDPGRO disables UDP GRO if it is enabled. Certain device drivers
// (e.g. vxlan, geneve) do not properly handle coalesced UDP packets later
// in the stack, resulting in packet loss.
// DisableUDPGRO disables UDP GRO if it is enabled.
DisableUDPGRO()
// DisableTCPGRO disables TCP GRO if it is enabled.
DisableTCPGRO()
}