mac_set_mtu
err = mac_set_mtu(port->lp_mh, sdu, old_mtu);
mac_set_mtu,
.set_mtu = mac_set_mtu,
(void) mac_set_mtu(mac, 1500);
mac_set_mtu,
.set_mtu = mac_set_mtu,
mac_set_mtu,
.set_mtu = mac_set_mtu,
mac_set_mtu,
.set_mtu = mac_set_mtu,
err = mac_set_mtu(mh, mtu, NULL);
extern int mac_set_mtu(mac_handle_t, uint_t, uint_t *);
rv = mac_set_mtu(vswp->mh, mtu, &mtu_orig);