Re: [Qemu-devel] Re: [PATCH 6/7] virtio-net: Add new RX filter controls

[Michael S. Tsirkin]

On Wed, Jun 10, 2009 at 12:22:35PM +0300, Gleb Natapov wrote:
> On Wed, Jun 10, 2009 at 12:17:55PM +0300, Michael S. Tsirkin wrote:
> > On Wed, Jun 10, 2009 at 12:13:21PM +0300, Gleb Natapov wrote:
> > > On Wed, Jun 10, 2009 at 12:07:59PM +0300, Michael S. Tsirkin wrote:
> > > > On Wed, Jun 10, 2009 at 10:58:44AM +0200, Jan Kiszka wrote:
> > > > > Michael S. Tsirkin wrote:
> > > > > > On Tue, Jun 09, 2009 at 05:42:32PM +0200, Jan Kiszka wrote:
> > > > > >> The same is true for PF_PACKET (or does libpcap actually use that
> > > > > >> internally?). Haven't analyzed the reasons in details yet, but I 
> > > > > >> bet
> > > > > >> it's not solvable in user space.
> > > > > >>
> > > > > >> Jan
> > > > > > 
> > > > > > I think you can load the veth module, and attach veth to a bridge.
> > > > > 
> > > > > Sorry, my brain is not yet working at full speed: What do we gain for
> > > > > the initial problem that we want to bridge to an existing network 
> > > > > device
> > > > > without having to move management tools like dhcpcd to the 
> > > > > corresponding
> > > > > brX?
> > > > > 
> > > > > Jan
> > > > 
> > > > Nothing :). I was only saying that IIUC the problem is not with
> > > > PF_PACKET itself - I think that PF_PACKET + veth can be used
> > > > as a replacement for tap.
> > > > 
> > > And the point is...?
> > 
> > tap requires bridging, PF_PACKET can attach to a physical device.
> > 
> Why tap requires bridging? User requires bridging, so he uses bridge.

Yea, good point :)

> Look above, you wrote "I think you can load the veth module, and attach
> veth to a bridge."


-- 
MST