linux-kernel - Re: [PATCH net-next v6] net: openvswitch: IPv6: Add IPv6 extension header support

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Date:   Thu, 30 Sep 2021 09:12:50 -0700
From:   Cpp Code <cpp.code.lv@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, pshelar@....org,
        "David S. Miller" <davem@...emloft.net>,
        ovs dev <dev@...nvswitch.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v6] net: openvswitch: IPv6: Add IPv6 extension
 header support

On Tue, Sep 28, 2021 at 5:48 PM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Tue, 28 Sep 2021 12:47:27 -0700 Toms Atteka wrote:
> > diff --git a/include/uapi/linux/openvswitch.h b/include/uapi/linux/openvswitch.h
> > index a87b44cd5590..dc6eb5f6399f 100644
> > --- a/include/uapi/linux/openvswitch.h
> > +++ b/include/uapi/linux/openvswitch.h
> > @@ -346,6 +346,13 @@ enum ovs_key_attr {
> >  #ifdef __KERNEL__
> >       OVS_KEY_ATTR_TUNNEL_INFO,  /* struct ip_tunnel_info */
> >  #endif
> > +
> > +#ifndef __KERNEL__
>
> #else
>
> > +     PADDING,  /* Padding so kernel and non kernel field count would match */
>
> The name PADDING seems rather risky, collisions will be likely.
> OVS_KEY_ATTR_PADDING maybe?
>
> But maybe we don't need to define this special value and bake it into
> the uAPI, why can't we add something like this to the kernel header
> (i.e. include/linux/openvswitch.h):
>
> /* Insert a kernel only KEY_ATTR */
> #define OVS_KEY_ATTR_TUNNEL_INFO        __OVS_KEY_ATTR_MAX
> #undef OVS_KEY_ATTR_MAX
> #define OVS_KEY_ATTR_MAX                __OVS_KEY_ATTR_MAX
>
> > +#endif

Agree, name should be changed, I think I will go with __OVS_KEY_ATTR_PADDING