ethtool: Add phy statistics
Ethernet PHYs can maintain statistics, for example errors while idle and receive errors. Add an ethtool mechanism to retrieve these statistics, using the same model as MAC statistics. Signed-off-by: NAndrew Lunn <andrew@lunn.ch> Reviewed-by: NFlorian Fainelli <f.fainelli@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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