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Its hard to tell if vlans are dropping frames, since every frame given to vlan_???_start_xmit() functions is accounted as fully transmitted by lower device. We can test dev_queue_xmit() return values to properly account for dropped frames. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>