GE_WHACK_STOP
gfe_tx_cleanup(sc, GE_TXPRIO_HI, op == GE_WHACK_STOP);
gfe_tx_cleanup(sc, GE_TXPRIO_LO, op == GE_WHACK_STOP);
case GE_WHACK_STOP:
gfe_tx_stop(sc, GE_WHACK_STOP);
gfe_rx_stop(sc, GE_WHACK_STOP);
error = gfe_whack(sc, GE_WHACK_STOP);