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

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Message-ID: <CALnjE+p2KQqZsgkHYsWrJfKUCev85eGH6TWdrQHTA-9KxO9tjQ@mail.gmail.com>
Date:	Tue, 6 Oct 2015 14:16:02 -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 12:32 PM, Jiri Benc <jbenc@...hat.com> wrote:
> On Tue, 6 Oct 2015 12:21:24 -0700, Pravin Shelar wrote:
>> It should report the flag when device parameters are requested by
>> userspace if there is support for lwtunnel. So check for the flag
>> should be good enough test for lwtunnel support. Why is that not
>> reliable check?
>
> Which device? You'll need to create one before querying it. Which won't
> work so nicely for older kernels. Basically, what the user space would
> have to do is trying to create a vxlan interface and then deleting it
> and going the tunnel vport way. It can be quite confusing, I'm afraid.
>

When OVS needs to add a vxlan tunnel device, OVS can create the vxlan
device and check the parameters for the flag. If the flag does not
exist then fallback to vport-create. This only needs to be done for
very first tunnel device. Thats how most of features are supported in
OVS.
Sorry, but I do not see where is the confusion.
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