FCRTL
E1000_WRITE_REG(hw, FCRTL, 0);
E1000_WRITE_REG(hw, FCRTL, (hw->fc_low_water
E1000_WRITE_REG(hw, FCRTL, hw->fc_low_water);
sc->hw.fc.low_water = FCRTL;
IXGB_WRITE_REG(hw, FCRTL, 0);
IXGB_WRITE_REG(hw, FCRTL,
IXGB_WRITE_REG(hw, FCRTL, hw->fc.low_water);