int dpif_port_query_by_number(const struct dpif *, uint32_t port_no,
struct dpif_port *);
int dpif_port_query_by_name(const struct dpif *, const char *devname,
int dpif_port_query_by_number(const struct dpif *, uint32_t port_no,
struct dpif_port *);
int dpif_port_query_by_name(const struct dpif *, const char *devname,