[NET] loopback: minor statistics optimization
The loopback device status structure is a singleton and doesn't need to be allocated. Add ethtool_ops hooks to show checksum always on, and make ethtool_ops const. Signed-off-by: NStephen Hemminger <shemminger@osdl.org> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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