ofp-util: Support OFPP_LOCAL in enqueue actions.

[sliver-openvswitch.git] / DESIGN

diff --git a/DESIGN b/DESIGN
index 886994b..c53a8ea 100644 (file)
--- a/DESIGN
+++ b/DESIGN
@@ -9,6 +9,16 @@ successful deployment.  The end of this document contains contact
 information that can be used to let us know how we can make Open vSwitch
 more generally useful.
 
 information that can be used to let us know how we can make Open vSwitch
 more generally useful.
 

+OpenFlow
+========
+
+The OpenFlow 1.0 specification requires the output port of the OFPAT_ENQUEUE
+action to "refer to a valid physical port (i.e. < OFPP_MAX) or OFPP_IN_PORT".
+Although OFPP_LOCAL is not less than OFPP_MAX, it is an 'internal' port which
+can have QoS applied to it in Linux.  Since we allow the OFPAT_ENQUEUE to apply
+to 'internal' ports whose port numbers are less than OFPP_MAX, we interpret
+OFPP_LOCAL as a physical port and support OFPAT_ENQUEUE on it as well.
+

 
 Multiple Table Support
 ======================
 
 Multiple Table Support
 ======================