DUPLEX_INVALID
tp->link_config.active_duplex = DUPLEX_INVALID;
tp->link_config.active_duplex = DUPLEX_INVALID;
[0] = (SPEED_INVALID << 2) | DUPLEX_INVALID,
[MII_TG3_AUX_STAT_100_4 >> 8] = (SPEED_INVALID << 2) | DUPLEX_INVALID,
lc->requested_duplex = lc->duplex = DUPLEX_INVALID;
lc->duplex = duplex < 0 ? DUPLEX_INVALID : duplex;