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@@ -3609,6 +3609,11 @@ of \field{mac} in the config space.
If the driver negotiates the VIRTIO_NET_F_CTRL_VLAN feature, it
can control a VLAN filter table in the device.
+\begin{note}
+Similar to the MAC address based filtering, the VLAN filtering
+is also best-effort: unwanted packets could still arrive.
+\end{note}
+
\begin{lstlisting}
#define VIRTIO_NET_CTRL_VLAN 2
#define VIRTIO_NET_CTRL_VLAN_ADD 0