Merge branch 'udp-tunnel-offloads-toggle'

Sabrina Dubroca says:

====================
Allow to switch off UDP-based tunnel offloads per netdevice

This patchset adds a new netdevice feature to toggle RX offloads of
UDP-based tunnel via ethtool. This is useful if the offload is causing
issues, for example if the hardware is buggy.

The feature is added to all devices providing the ->ndo_udp_tunnel_add
op, and enabled by default to preserve current behavior.

When the administrator disables this feature on a device, all
currently offloaded ports are cleared from the device.  When the
feature is turned on, the stack notifies the device about all current
ports.

v2:
 - rename feature bit to NETIF_F_RX_UDP_TUNNEL_PORT
 - rename ethtool feature to rx-udp_tunnel-port-offload
====================

Signed-off-by: David S. Miller <davem@davemloft.net>