bge_ifmedia_upd
int bge_ifmedia_upd(struct ifnet *);
ifmedia_init(&sc->bge_ifmedia, IFM_IMASK, bge_ifmedia_upd,
ifmedia_init(&sc->bge_mii.mii_media, 0, bge_ifmedia_upd,
bge_ifmedia_upd(ifp);