On Tue, Jun 17, 2014 at 08:06:58AM +0200, Stefan Priebe - Profihost AG wrote:

Am 16.06.2014 23:30, schrieb Francois Romieu:

quoted

Stefan Priebe - Profihost AG [off-list ref] :
[...]

quoted

That sounds great! Is there anything I can do or some code I can port to veth?

You may add an empty handler for .ndo_poll_controller in drivers/net/veth.c
and give it a try on current kernel.

It should not be too bad.

Why is an empty poll controller enough to fix it? This sounds a bit
crazy to me.

Because the presence of a non-null poll_controller method is how we determine if
a device supports netpoll.  Most devices require a ndo_poll_controller function
to simulate an interrupt for receiving packets, but virtual devices really
don't, so an empty function sufficies to get the device recognized as having
netpoll support.  See tun_poll_controller as an example
Neil

Greets,
Stefan
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