IXGBE_FCTRL_UPE
reg_rctl &= ~IXGBE_FCTRL_UPE;
reg_rctl |= IXGBE_FCTRL_UPE | IXGBE_FCTRL_MPE;
reg_rctl &= ~IXGBE_FCTRL_UPE;
fctrl |= (IXGBE_FCTRL_UPE | IXGBE_FCTRL_MPE);
fctrl |= IXGBE_FCTRL_UPE | IXGBE_FCTRL_MPE;
fctrl &= ~IXGBE_FCTRL_UPE;
fctrl &= ~(IXGBE_FCTRL_UPE | IXGBE_FCTRL_MPE);
fctrl |= IXGBE_FCTRL_UPE;
fctrl &= ~IXGBE_FCTRL_UPE;