From: Jiri Pirko <jiri@resnulli.us>
Date: Thu, 26 Feb 2015 15:44:33 +0100

Thu, Feb 26, 2015 at 03:19:27PM CET, sfeldma@gmail.com wrote:

quoted

Missing .ndo_start_xmit is the clue....do we need more?

You do not want to add null check for ndo_start_xmit to xmit path :)
This should be some stub in case of no-tx.

Cheapest would be to force the device to use the noop_qdisc which
simply throws all packets away.

No fast path tests whatsoever.

Or we can attach an ndo_start_xmit that drops packets too.