netdev - Re: [Patch net-next v5 0/5] vxlan: add ipv6 support

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Date:	Tue, 23 Apr 2013 14:27:35 +0800
From:	Cong Wang <amwang@...hat.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: Re: [Patch net-next v5 0/5] vxlan: add ipv6 support

On Tue, 2013-04-23 at 11:30 +0800, Cong Wang wrote:
> On Mon, 2013-04-22 at 16:08 -0400, David Miller wrote:
> > 
> > Please do not fix this by adding Kconfig dependencies, you have to
> > find another way.  In bonding and bridging, we've made it such that
> > you can configure them in any combination whatsoever with ipv6 and
> > everything works properly.  Most of them time this can be accomplished
> > by moving things into the explicit "obj-y" objects in
> > net/ipv6/Makefile
> 
> One quick solution is just linking mcast.o statically, because it is not
> easy to separate core functions from mcast.c like addrconf_core.c.
> 
> > 
> > If you are adding stateful dependencies upon ipv6 (you want to inspect
> > the ipv6 routes or something like that), I'm sorry but I really don't
> > want any hard dependies on ipv6's internal state, we can't export that
> > properly.
> 
> I don't think we need that.
> 

After several tries, I think it is not easy to do at all, it relies on
some icmp functions at least, which are still compiled as a module. So,
I can't think out any easier solution than simply adding Kconfig
dependency.

Or maybe I should raise the question again: should we forbid compiling
IPv6 as a module from now on? At least some popular distributions
already use CONFIG_IPV6=y. The only IPv6 things we really need to
compile as a module is probably just procfs/sysfs stuffs.

Thanks.

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