Re: [Xen-devel] [PATCH] allow netif frontend to indicate ethernet multicast groups of interest

[David Edmondson <dme@xxxxxxx>]

On 22 Nov 2007, at 2:12pm, Kieran Mansley wrote:
> On Thu, 2007-11-22 at 14:01 +0000, Keir Fraser wrote:
> > How does a frontend detect whether these options are supported by the
> > backend? What happens across save/restore? Would this be better  
> > implemented
> > by a multicast list in xenstore?
> A per-guest-vif list in xenstore would also have the advantage that it
> would be easily accessible and usable by the network acceleration
> modules, without having to republish the add/remove requests from
> netback to any registered accelerators.
The best approach for accelerators would seem to depend somewhat on  
the hardware implementation. If the frontend plugin is able to deal  
with the request, there might be no need for the backend plugin to do  
anything.
Having netfront propagate the request to both the frontend plugin and  
the backend (which would relay it to the backend plugin) seems  
straightforward.
Parsing the xenstore entries in more than one place seems like an odd  
approach, particularly as there would ideally be coordination between  
the software driver and the accelerator.
dme.
--
David Edmondson, Solaris Engineering, http://dme.org



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