netdev uses tc to implement the queueing mechanism.
Queue configuration takes place through dpctl.
Each queue is represented by a send-only socket, while
there is a default socket that receives traffic and
sends best-effort traffic. This is necessary to overcome
limitations from user-only implementation.
This makes it easier to install the headers, or to use them directly from
another software package with -I$(openflow)/include, without invading
the top-level include file namespace.
Yiannis Yiakoumis
Ben Pfaff