Probably your link is never coming up. We won't send packets
over the wire unless the device is in the link-up state.
However, if ->dequeue() is returning NULL, there really aren't
any packets in the device queue to be sent.
If you want, add more tracing to pfifo_fast_dequeue() since
that's almost certainly which queueing discipline is hooked
up to your VIA Rhine device as it's the default.
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