VTNET_FLAG_LINK
IFF_RUNNING || ((sc->vtnet_flags & VTNET_FLAG_LINK) == 0))
sc->vtnet_flags &= ~VTNET_FLAG_LINK;
if (link && ((sc->vtnet_flags & VTNET_FLAG_LINK) == 0)) {
sc->vtnet_flags |= VTNET_FLAG_LINK;
} else if (!link && (sc->vtnet_flags & VTNET_FLAG_LINK)) {
sc->vtnet_flags &= ~VTNET_FLAG_LINK;