[evb] RE: [PATCH][RFC] net/bridge: add basic VEPA support
Stephen Hemminger
shemminger at linux-foundation.org
Fri Aug 7 14:36:52 PDT 2009
On Fri, 7 Aug 2009 14:06:58 -0700
"Paul Congdon \(UC Davis\)" <ptcongdon at ucdavis.edu> wrote:
> Yaron,
>
>
> The interface multiplexing can be achieved using macvlan driver or using an SR-IOV capable NIC (the preferred option), macvlan may need to be extended to support VEPA multicast handling, this looks like a rather simple task
>
> Agreed that the hardware solution is preferred so the macvlan implementation doesn’t really matter. If we are talking SR-IOV, then it is direct mapped, regardless of whether there is a VEB or VEPA in the hardware below, so you are bypassing the bridge software code also.
>
> I disagree that adding the multicast handling is simple – while not conceptually hard, it will basically require you to put an address table into the macvlan implementation – if you have that, then why not have just used the one already in the bridge code. If you hook a VEPA up to a non-hairpin mode external bridge, you get the macvlan capability as well.
I have a patch that forwards all multicast packets, and another that does
proper forwarding. It should have worked that way in original macvlan, the
current behavior is really a bug.
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