E1000_CTRL_EXT_DRV_LOAD
ctrl_ext | E1000_CTRL_EXT_DRV_LOAD);
ctrl_ext & ~E1000_CTRL_EXT_DRV_LOAD);
ctrl_ext |= E1000_CTRL_EXT_DRV_LOAD;
ctrl_ext &= ~E1000_CTRL_EXT_DRV_LOAD;