[Bridge] netconsole breaks netpoll on bridge

Neil Horman nhorman at tuxdriver.com
Tue Jun 17 12:18:58 UTC 2014


On Tue, Jun 17, 2014 at 08:06:58AM +0200, Stefan Priebe - Profihost AG wrote:
> Am 16.06.2014 23:30, schrieb Francois Romieu:
> > Stefan Priebe - Profihost AG <s.priebe at profihost.ag> :
> > [...]
> >> 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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