struct tnl_port *tnl_port_add(const struct ofport *, uint32_t odp_port);
void tnl_port_del(struct tnl_port *);
-const struct ofport *tnl_port_receive(struct flow *);
+const struct ofport *tnl_port_receive(const struct flow *);
uint32_t tnl_port_send(const struct tnl_port *, struct flow *);
/* Returns true if 'flow' should be submitted to tnl_port_receive(). */