+ const struct smap *smap,
+ struct netdev *netdev);
+struct bfd *bfd_ref(const struct bfd *);
+void bfd_unref(struct bfd *);
+
+void bfd_account_rx(struct bfd *, const struct dpif_flow_stats *);
+bool bfd_forwarding(struct bfd *);
+bool bfd_check_status_change(struct bfd *);