net: dsa: Add ndo_get_phys_port_name() for CPU port
There is not currently way to infer the port number through sysfs that is being used as the CPU port number. Overlay a ndo_get_phys_port_name() operation onto the DSA master network device in order to retrieve that information. Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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