sbmac_duplex_t
sbmac_set_duplex(struct sbmac_softc *sc, sbmac_duplex_t duplex, sbmac_fc_t fc)
sbmac_duplex_t sbm_duplex; /* current duplex */
static bool sbmac_set_duplex(struct sbmac_softc *, sbmac_duplex_t, sbmac_fc_t);