IXGBE_IVAR
ivar = IXGBE_READ_REG(hw, IXGBE_IVAR(index));
IXGBE_WRITE_REG(&sc->hw, IXGBE_IVAR(index), ivar);
ivar = IXGBE_READ_REG(hw, IXGBE_IVAR(entry >> 1));
IXGBE_WRITE_REG(hw, IXGBE_IVAR(entry >> 1), ivar);