netdevice: add IPv4 fib add/del ops
Add two new ndo ops for IPv4 fib offload support, add and del. Add uses modifiy semantics if fib entry already offloaded. Drivers implementing the new ndo ops will return err<0 if programming device fails, for example if device's tables are full. Signed-off-by: NScott Feldman <sfeldma@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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