net: bridge: Add support for calling FDB external learning under rcu
This is done as a preparation to moving the switchdev notifier chain to be atomic. The FDB external learning should be called under rtnl or rcu. Signed-off-by: NArkadi Sharshevsky <arkadis@mellanox.com> Reviewed-by: NIdo Schimmel <idosch@mellanox.com> Reviewed-by: NNikolay Aleksandrov <nikolay@cumulusnetworks.com> Signed-off-by: NJiri Pirko <jiri@mellanox.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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