netdev - Re: [PATCH net-next 0/4] gtp: support multiple APN's per GTP endpoint

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Date:   Tue, 14 Mar 2017 12:45:38 +0100
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Andreas Schultz <aschultz@...p.net>
Cc:     Harald Welte <laforge@...monks.org>,
        osmocom-net-gprs@...ts.osmocom.org,
        netdev <netdev@...r.kernel.org>,
        Lionel Gauthier <Lionel.Gauthier@...ecom.fr>
Subject: Re: [PATCH net-next 0/4] gtp: support multiple APN's per GTP endpoint

On Tue, Mar 14, 2017 at 12:25:44PM +0100, Andreas Schultz wrote:
[...]
> API impact:
> -----------
> 
> This is probably the most problematic part of this series...
> 
> The removeal of the TEID form the netdevice also means that the gtp genl API
> for retriving tunnel information and removing tunnels needs to be adjusted.
> 
> Before this change it was possible to change a GTP tunnel using the gtp
> netdevice id and the teid. The teid is no longer unique per gtp netdevice.
> After this change it has to be either the netdevice and MS IP or the GTP
> socket and teid.

Then we have to introduce some explicit VRF concept or such to sort
out this.

It is definitely not acceptable to break the existing API.