netdev - Re: [PATCH 2/2 net-next] ip_tunnel: operstate support and link state transfer

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Message-ID: <20130806104942.25bdcfa1@nehalam.linuxnetplumber.net>
Date:	Tue, 6 Aug 2013 10:49:42 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Pravin Shelar <pshelar@...ira.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH 2/2 net-next] ip_tunnel: operstate support and link
 state transfer

On Tue, 6 Aug 2013 10:42:53 -0700
Pravin Shelar <pshelar@...ira.com> wrote:

> On Mon, Aug 5, 2013 at 10:53 PM, Stephen Hemminger
> <stephen@...workplumber.org> wrote:
> > Tunnel devices should reflect the carrier state of the lower device.
> > I.e if carrier goes down on the lower (ethernet) device, it should
> > change on the tunnel as well.
> >
> > This patch also adds full RFC2863 compatible state so that the
> > tunnel state can be controlled from user space as described in
> > Documentation/networking/operstats.txt
> >
> > Example of usage:
> > ip li add tnl1 mode dormant \
> >   type gretap remote 172.19.20.21 local 172.16.17.18 dev eth1
> > ip li set dev tnl1 up
> > ip li set dev tnl1 state UP
> >
> > In real life, this would be managed by tunnel broker, not
> > iproute2 shell commands.
> >
> >
> I sent out similar patch which try to add this feature at ip_tunnel
> generic layer rather than in tunnel implementation.  This way we can
> share single notifier for all tunneling protocols.
> Can you have something similar?
> http://marc.info/?l=linux-netdev&m=135761231222711&w=2

How does that work well for case of GRE where gre and gretap
have different net namespace id's. If it can handle that, then
this is better.

Also link_map could be array (not allocated), and avoid
another layer of indirection

Also, the rfc2863 policy needs to handle CHANGE (for carrier).
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