X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=DESIGN;h=c53a8ea3f54a839aaeb1b6a08d005961e5e8cefd;hb=e9ade0fee62e886c2459ca42d1e15f06a0045ce4;hp=886994b0ae1e72c31f4b9abf3e820545c1a2a308;hpb=66abb12bf48104e0d2b9be8b9d14252a3afd2a4a;p=sliver-openvswitch.git

diff --git a/DESIGN b/DESIGN
index 886994b0a..c53a8ea3f 100644
--- 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.
 
+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
 ======================