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simplify making new Queues

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This commit is contained in:
JackDoan
2026-07-14 10:56:21 -05:00
parent 284c90c20e
commit 40b7d48868
18 changed files with 105 additions and 196 deletions
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overlay/tun_linux_test.go
+8 -9
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@@ -41,7 +41,7 @@ func TestTunAdvMSS(t *testing.T) {
func TestOffloadUSOEnabled(t *testing.T) {
// usoOffloadFlags must be a strict superset of tsoOffloadFlags. Otherwise
// the TSO-only fallback (and the historic hardcoded-mask bug in
// NewMultiQueueReader) would not actually be a downgrade.
// addQueue) would not actually be a downgrade.
if usoOffloadFlags&tsoOffloadFlags != tsoOffloadFlags {
t.Fatalf("usoOffloadFlags (%#x) is not a superset of tsoOffloadFlags (%#x)", usoOffloadFlags, tsoOffloadFlags)
}
@@ -67,20 +67,19 @@ func TestOffloadUSOEnabled(t *testing.T) {
}
}
// TestNewMultiQueueReaderReplaysNegotiatedMask guards the device-wide
// TUNSETOFFLOAD downgrade bug: NewMultiQueueReader must issue the exact mask
// newTun negotiated (t.offloadFlags), not a hardcoded TSO-only mask. Because
// TUNSETOFFLOAD is per-netdev, a narrower mask on an added queue silently
// disables USO for every queue on a USO-capable kernel while the queues keep
// advertising it.
// TestAddQueueReplaysNegotiatedMask guards the device-wide TUNSETOFFLOAD
// downgrade bug: addQueue must issue the exact mask newTun negotiated
// (t.offloadFlags), not a hardcoded TSO-only mask. Because TUNSETOFFLOAD is
// per-netdev, a narrower mask on an added queue silently disables USO for
// every queue on a USO-capable kernel while the queues keep advertising it.
//
// A full multi-queue exercise needs /dev/net/tun and CAP_NET_ADMIN, which are
// not available in CI/sandbox, so this asserts on the struct field that the
// TUNSETOFFLOAD argument is read from.
func TestNewMultiQueueReaderReplaysNegotiatedMask(t *testing.T) {
func TestAddQueueReplaysNegotiatedMask(t *testing.T) {
t.Run("uso-negotiated", func(t *testing.T) {
tn := &tun{vnetHdr: true, offloadFlags: usoOffloadFlags}
// The ioctl argument in NewMultiQueueReader is uintptr(t.offloadFlags);
// The ioctl argument in addQueue is uintptr(t.offloadFlags);
// it must equal the negotiated USO mask, and must NOT be the TSO-only
// mask (the original bug).
if tn.offloadFlags != usoOffloadFlags {