+size_t ofconn_n_pending_opgroups(const struct ofconn *);
+bool ofconn_has_pending_opgroups(const struct ofconn *);
+void ofconn_add_opgroup(struct ofconn *, struct list *);
+void ofconn_remove_opgroup(struct ofconn *, struct list *,
+ const struct ofp_header *request, int error);
+