E1000_CTRL_SPD_1000
ctrl |= E1000_CTRL_SPD_1000;
ctrl_reg |= E1000_CTRL_SPD_1000 | E1000_CTRL_FRCSPD |
reg = ctrl_reg & ~(E1000_CTRL_SPD_1000 | E1000_CTRL_SPD_100);
ctrl &= ~(E1000_CTRL_SPD_1000 | E1000_CTRL_SPD_100);