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