netdev - Re: [PATCH net] openvswitch: Fix egress tunnel info.

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Message-ID: <CALnjE+ozN6CXTmhVjWiQLEUTL0Q8FJjPeO-H-zzoXKgvjcu2DA@mail.gmail.com>
Date:	Tue, 6 Oct 2015 11:55:35 -0700
From:	Pravin Shelar <pshelar@...ira.com>
To:	Jiri Benc <jbenc@...hat.com>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net] openvswitch: Fix egress tunnel info.

On Tue, Oct 6, 2015 at 11:45 AM, Jiri Benc <jbenc@...hat.com> wrote:
> On Tue, 6 Oct 2015 11:28:08 -0700, Pravin Shelar wrote:
>> What do you have in mind? I do not see way to fix this issue in vport-*.c.
>
> It seems to me that e.g. the code you have in vxlan_egress_tun_info in
> drivers/net/vxlan.c can be put into vxlan_get_egress_tun_info in
> net/openvswitch/vport-vxlan.c. vport->dev is guaranteed to be vxlan,
> and the current code accesses netdev_priv(dev) as struct vxlan_dev
> anyway.
>
> This would of course not work if we created lwtunnel interface from the
> ovs user space. But that's not going to happen with kernel 4.3, we'll
> need a way to query datapath for features it supports for this to work

This issue exist for lwtunnel based devices, for vport based tunnels
there is no bug.

> - there's currently no useful way to determine whether the kernel
> supports metadata based vxlan or not. I'm working on a patch to query
> the datapath for the supported features but that's for net-next. Thus
> I think we're safe.
>
We should be able to use lwtunnel devices on 4.3. How about using
tunnel device parameters to detect lwtunnel support. For example in
case of vxlan tunnel IFLA_VXLAN_COLLECT_METADATA flags can confirm
lwtunnel support.
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