ovn-architecture: Document the registers used for logical ports.

When reviewing the OpenFlow flows generated by ovn-controller, it's nice
to have this information.

Signed-off-by: Justin Pettit <jpettit@nicira.com>
Acked-by: Russell Bryant <rbryant@redhat.com>

diff --git a/ovn/ovn-architecture.7.xml b/ovn/ovn-architecture.7.xml
index 1b537f9..2424836 100644 (file)
--- a/ovn/ovn-architecture.7.xml
+++ b/ovn/ovn-architecture.7.xml
@@ -627,18 +627,19 @@
 
     <dt>logical input port field</dt>
     <dd>
-      A field that denotes the logical port from which the packet entered the
-      logical datapath.  OVN stores this in a Nicira extension register.  (This
-      field is passed across tunnels as part of the tunnel key.)
+      A field that denotes the logical port from which the packet
+      entered the logical datapath.  OVN stores this in Nicira extension
+      register number 6.  (This field is passed across tunnels as part
+      of the tunnel key.)
     </dd>
 
     <dt>logical output port field</dt>
     <dd>
-      A field that denotes the logical port from which the packet will leave
-      the logical datapath.  This is initialized to 0 at the beginning of the
-      logical ingress pipeline.  OVN stores this in a Nicira extension
-      register.  (This field is passed across tunnels as part of the tunnel
-      key.)
+      A field that denotes the logical port from which the packet will
+      leave the logical datapath.  This is initialized to 0 at the
+      beginning of the logical ingress pipeline.  OVN stores this in
+      Nicira extension register number 7.  (This field is passed across
+      tunnels as part of the tunnel key.)
     </dd>
 
     <dt>VLAN ID</dt>