netdev - Re: [patch net-next rfc 3/7] net: rtnetlink: add commands to add and delete alternative ifnames

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Message-ID: <CAJieiUgK0YSyXLWXn6TygO0S+EJqwDeaknQ2De2RwMyHXXqxuA@mail.gmail.com>
Date:   Mon, 12 Aug 2019 09:23:49 -0700
From:   Roopa Prabhu <roopa@...ulusnetworks.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     Jiri Pirko <jiri@...nulli.us>, David Ahern <dsahern@...il.com>,
        netdev <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>, dcbw@...hat.com,
        Michal Kubecek <mkubecek@...e.cz>,
        Andrew Lunn <andrew@...n.ch>, parav@...lanox.com,
        Saeed Mahameed <saeedm@...lanox.com>,
        mlxsw <mlxsw@...lanox.com>
Subject: Re: [patch net-next rfc 3/7] net: rtnetlink: add commands to add and
 delete alternative ifnames

On Mon, Aug 12, 2019 at 8:40 AM Stephen Hemminger
<stephen@...workplumber.org> wrote:
>
> On Mon, 12 Aug 2019 10:31:39 +0200
> Jiri Pirko <jiri@...nulli.us> wrote:
>
> > Mon, Aug 12, 2019 at 03:37:26AM CEST, dsahern@...il.com wrote:
> > >On 8/11/19 7:34 PM, David Ahern wrote:
> > >> On 8/10/19 12:30 AM, Jiri Pirko wrote:
> > >>> Could you please write me an example message of add/remove?
> > >>
> > >> altnames are for existing netdevs, yes? existing netdevs have an id and
> > >> a name - 2 existing references for identifying the existing netdev for
> > >> which an altname will be added. Even using the altname as the main
> > >> 'handle' for a setlink change, I see no reason why the GETLINK api can
> > >> not take an the IFLA_ALT_IFNAME and return the full details of the
> > >> device if the altname is unique.
> > >>
> > >> So, what do the new RTM commands give you that you can not do with
> > >> RTM_*LINK?
> > >>
> > >
> > >
> > >To put this another way, the ALT_NAME is an attribute of an object - a
> > >LINK. It is *not* a separate object which requires its own set of
> > >commands for manipulating.
> >
> > Okay, again, could you provide example of a message to add/remove
> > altname using existing setlink message? Thanks!
>
> The existing IFALIAS takes an empty name to do deletion.

yes, if its a single alt name, keeping it similar to IFALIAS will help