faq: Specify QoS support is dependent on interface type.
QoS support depends on interface type; document it.
@@ -133,6 +133,10 @@ Q: Are all features available with all datapaths?
* Only a limited set of flow fields is modifiable via the set action by the
Hyper-V datapath.
+ * Userspace datapath support, in some cases, is dependent on the associated
+ interface types. For example, DPDK interfaces support ingress and egress
+ policing, but not shaping.
+
The following table lists features that do not *directly* impact an Open
vSwitch user, e.g. because their absence can be hidden by the ofproto layer
(usually this comes with a performance penalty).
