netdev - Re: [PATCH net-next 2/2] openvswitch: add erspan version II support

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Date:   Tue, 9 Jan 2018 07:17:25 -0800
From:   William Tu <u9012063@...il.com>
To:     Pravin Shelar <pshelar@....org>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 2/2] openvswitch: add erspan version II support

On Mon, Jan 8, 2018 at 4:03 PM, Pravin Shelar <pshelar@....org> wrote:
> On Fri, Jan 5, 2018 at 2:29 PM, William Tu <u9012063@...il.com> wrote:
>> The patch adds support for configuring the erspan version II
>> fields for openvswitch.
>>
> The patch looks good, But it could change userspace API for
> OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS, how are we going to handle
> compatibility?
>
Thanks.
Yes, it will break the previous API, which uses
OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS only to store 32-bit erspan index.
Should I create another tunnel key attr?
Something like:
-       OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTS,        /* be32 ERSPAN index. */
+       OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTSV1,        /* compatibility for
erspan v1, be32 ERSPAN index. */
+       OVS_TUNNEL_KEY_ATTR_ERSPAN_OPTSV2,        /* supporting both
v1 and v2 using Nested OVS_ERSPAN_OPT_* */

Regards,
William