RTK_ENABLED
sc->sc_flags |= RTK_ENABLED;
sc->sc_flags &= ~RTK_ENABLED;
sc->sc_flags |= RTK_ENABLED;
sc->sc_flags &= ~RTK_ENABLED;
#define RTK_IS_ENABLED(sc) ((sc)->sc_flags & RTK_ENABLED)
sc->sc_flags |= RTK_ENABLED;
sc->sc_flags |= RTK_ENABLED;