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net: dsa: use switchdev attr and obj handlers
This series reduces boilerplate in the handling of switchdev attribute and
object operations by using the switchdev_handle_* helpers, which check the
targeted devices and recurse into their lower devices.
This also brings back the ability to inspect operations targeting the bridge
device itself (where .orig_dev and .dev were originally the bridge device),
even though that is of no use yet and skipped by this series.
Changes in v2: Only VLAN and (non-host) MDB objects not directly targeting
the slave device are unsupported at the moment, so only skip these cases.
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Signed-off-by: David S. Miller <davem@davemloft.net>