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net/tstun,wgengine/netstack: implement TCP GRO for local services (#13315)

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Throughput improves substantially when measured via netstack loopback
(TS_DEBUG_NETSTACK_LOOPBACK_PORT).

Before (d21ebc2):
jwhited@i5-12400-2:~$ iperf3 -V -c 100.100.100.100
Starting Test: protocol: TCP, 1 streams, 131072 byte blocks
Test Complete. Summary Results:
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  5.77 GBytes  4.95 Gbits/sec    0 sender
[  5]   0.00-10.01  sec  5.77 GBytes  4.95 Gbits/sec      receiver

After:
jwhited@i5-12400-2:~$ iperf3 -V -c 100.100.100.100
Starting Test: protocol: TCP, 1 streams, 131072 byte blocks
Test Complete. Summary Results:
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  12.7 GBytes  10.9 Gbits/sec    0 sender
[  5]   0.00-10.00  sec  12.7 GBytes  10.9 Gbits/sec      receiver

Updates tailscale/corp#22754

Signed-off-by: Jordan Whited <jordan@tailscale.com>
This commit is contained in:
Jordan Whited
2024-08-29 11:37:48 -07:00
committed by GitHub
parent 71acf87830
commit 0926954cf5
4 changed files with 33 additions and 26 deletions
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6
wgengine/netstack/netstack_test.go
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@@ -750,7 +750,7 @@ func TestHandleLocalPackets(t *testing.T) {
Dst: netip.MustParseAddrPort("100.100.100.100:53"),
TCPFlags: packet.TCPSyn,
}
resp := impl.handleLocalPackets(pkt, impl.tundev)
resp, _ := impl.handleLocalPackets(pkt, impl.tundev, nil)
if resp != filter.DropSilently {
t.Errorf("got filter outcome %v, want filter.DropSilently", resp)
}
@@ -767,7 +767,7 @@ func TestHandleLocalPackets(t *testing.T) {
Dst: netip.MustParseAddrPort("[fd7a:115c:a1e0:b1a:0:7:a01:109]:5678"),
TCPFlags: packet.TCPSyn,
}
resp := impl.handleLocalPackets(pkt, impl.tundev)
resp, _ := impl.handleLocalPackets(pkt, impl.tundev, nil)
// DropSilently is the outcome we expected, since we actually
// handled this packet by injecting it into netstack, which
@@ -789,7 +789,7 @@ func TestHandleLocalPackets(t *testing.T) {
Dst: netip.MustParseAddrPort("[fd7a:115c:a1e0:b1a:0:63:a01:109]:5678"),
TCPFlags: packet.TCPSyn,
}
resp := impl.handleLocalPackets(pkt, impl.tundev)
resp, _ := impl.handleLocalPackets(pkt, impl.tundev, nil)
// Accept means that handleLocalPackets does not handle this
// packet, we "accept" it to continue further processing,