netdev - Re: [RFC] vxlan: convert remote list to list

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Message-ID: <CAF1J0HOYRe-HiiEFFrB-Nk-V-UOfu25KVcyn02cA-t4S675-9Q@mail.gmail.com>
Date:	Tue, 4 Jun 2013 20:22:02 +0300
From:	Mike Rapoport <mike.rapoport@...ellosystems.com>
To:	David Stevens <dlstevens@...ibm.com>
Cc:	Stephen Hemminger <stephen@...workplumber.org>,
	netdev@...r.kernel.org, netdev-owner@...r.kernel.org,
	Thomas Graf <tgraf@...g.ch>
Subject: Re: [RFC] vxlan: convert remote list to list_rcu

On Tue, Jun 04, 2013 at 12:29:05PM -0400, David Stevens wrote:
> Stephen Hemminger <stephen@...workplumber.org> wrote on 06/04/2013
> 12:00:31 PM:
>
> > I am still not 100% convinced of the use case of providing multiple
> > destinations.
> > It seems like either a solution for migrating guests, a way to do
> > SPAN, or a weird
> > form of multicast.
>
> The use is, as you would say it, a weird form of multicast. It
> is to allow forwarding MAC multicasts without relying on the
> underlying network having multicast routers in the same domain.

For instance, public clouds do not allow multicasts, and vxlan with
multiple destinations would be a neat SDN solution there.

> > Wouldn't it be better to use something like TC actions for these
> > special cases and
> > handle it at the IP layer rather than having to add so much
> > complexity into the
> > VXLAN driver itself.
>
> This isn't a "special case" for DOVE -- it is the mechanism
> for doing MAC multicasts. I don't agree that the code is
> complex -- it simply replaces what was a vxlan_rdst with a
> list of vxlan_rdsts. And, no, I don't believe it can be
> done with equivalent performance using external mechanisms.
>
> Didn't we have this discussion when the patch went in?
>
>                                                         +-DLS
>
>
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