less garbage

overlay/tun.go

@@ -22,6 +22,7 @@ type TunDev interface {
 	AllocSeg(pkt *packet.OutPacket, q int) (int, error)
 	WriteOne(x *packet.OutPacket, kick bool, q int) (int, error)
 	WriteMany(x []*packet.OutPacket, q int) (int, error)
+	RecycleRxSeg(pkt *packet.VirtIOPacket, kick bool, q int) error
 }
 
 // TODO: We may be able to remove routines

overlay/tun_disabled.go

@@ -24,6 +24,10 @@ type disabledTun struct {
 	l  *logrus.Logger
 }
 
+func (*disabledTun) RecycleRxSeg(pkt *packet.VirtIOPacket, kick bool, q int) error {
+	return nil
+}
+
 func newDisabledTun(vpnNetworks []netip.Prefix, queueLen int, metricsEnabled bool, l *logrus.Logger) *disabledTun {
 	tun := &disabledTun{
 		vpnNetworks: vpnNetworks,

overlay/tun_linux.go

@@ -767,3 +767,7 @@ func (t *tun) WriteMany(x []*packet.OutPacket, q int) (int, error) {
 	}
 	return maximum, nil
 }
+
+func (t *tun) RecycleRxSeg(pkt *packet.VirtIOPacket, kick bool, q int) error {
+	return t.vdev[q].ReceiveQueue.OfferDescriptorChains(pkt.Chains, kick)
+}

overlay/user.go

@@ -38,6 +38,10 @@ type UserDevice struct {
 	inboundWriter *io.PipeWriter
 }
 
+func (d *UserDevice) RecycleRxSeg(pkt *packet.VirtIOPacket, kick bool, q int) error {
+	return nil
+}
+
 func (d *UserDevice) Activate() error {
 	return nil
 }

overlay/vhostnet/device.go

@@ -354,7 +354,7 @@ func (dev *Device) processChains(pkt *packet.VirtIOPacket, chains []virtqueue.Us
 	if int(pkt.Header.NumBuffers) != 1 {
 		return 0, fmt.Errorf("too smol-brain to handle more than one chain right now: %d chains", len(chains))
 	}
-	if chains[0].Length > 4000 {
+	if chains[0].Length > 16000 {
 		//todo!
 		return 1, fmt.Errorf("too big packet length: %d", chains[0].Length)
 	}
@@ -362,7 +362,6 @@ func (dev *Device) processChains(pkt *packet.VirtIOPacket, chains []virtqueue.Us
 	//shift the buffer out of out:
 	pkt.Payload = pkt.ChainRefs[0][virtio.NetHdrSize:chains[0].Length]
 	pkt.Chains = append(pkt.Chains, uint16(chains[0].DescriptorIndex))
-	pkt.Recycler = dev.ReceiveQueue.OfferDescriptorChains
 	return 1, nil
 
 	//cursor := n - virtio.NetHdrSize