ofp-util: Work on decoding OF1.1 flow_mods.

[openvswitch] / lib / dpif-provider.h

diff --git a/lib/dpif-provider.h b/lib/dpif-provider.h
index 594ce592031b0a268915be5343d8a38bdee278a6..0641d30696c8d26374cb437aa467b1ebe3fd296f 100644 (file)
--- a/lib/dpif-provider.h
+++ b/lib/dpif-provider.h
@@ -136,6 +136,10 @@ struct dpif_class {
      * actions as the OVS_USERSPACE_ATTR_PID attribute's value, for use in
      * flows whose packets arrived on port 'port_no'.
      *
+     * A 'port_no' of UINT16_MAX should be treated as a special case.  The
+     * implementation should return a reserved PID, not allocated to any port,
+     * that the client may use for special purposes.
+     *
      * The return value only needs to be meaningful when DPIF_UC_ACTION has
      * been enabled in the 'dpif''s listen mask, and it is allowed to change
      * when DPIF_UC_ACTION is disabled and then re-enabled.