Re: [PATCH] tun: teach the tun/tap driver to support netpoll

[David Miller <davem@davemloft.net>]

From: Neil Horman <nhorman@tuxdriver.com>
Date: Wed, 15 Jun 2011 11:25:01 -0400

> Commit 8d8fc29d02a33e4bd5f4fa47823c1fd386346093 changed the behavior of slave
> devices in regards to netpoll.  Specifically it created a mutually exclusive
> relationship between being a slave and a netpoll-capable device.  This creates
> problems for KVM because guests relied on needing netconsole active on a slave
> device to a bridge.  Ideally libvirtd could just attach netconsole to the bridge
> device instead, but thats currently infeasible, because while the bridge device
> supports netpoll, it requires that all slave interface also support it, but the
> tun/tap driver currently does not.  The most direct solution is to teach tun/tap
> to support netpoll, which is implemented by the patch below.
> 
> I've not tested this yet, but its pretty straightforward.
> 
> Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
> Reported-by: Rik van Riel <riel@redhat.com>
> CC: Rik van Riel <riel@redhat.com>
> CC: Maxim Krasnyansky <maxk@qualcomm.com>
> CC: Cong Wang <amwang@redhat.com>
> CC: "David S. Miller" <davem@davemloft.net>

Applied, thanks Neil.