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

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Message-ID: <CAJieiUhqAvqvxDZk517hWQP4Tx3Hk2PT7Yjq6NSGk+pB_87q8A@mail.gmail.com>
Date:   Mon, 12 Aug 2019 08:13:39 -0700
From:   Roopa Prabhu <roopa@...ulusnetworks.com>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     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 1:31 AM 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!

Will the below work ?... just throwing an example for discussion:

make the name list a nested list
IFLA_ALT_NAMES
        IFLA_ALT_NAME_OP /* ADD or DEL used with setlink */
        IFLA_ALT_NAME
        IFLA_ALT_NAME_LIST

With RTM_NEWLINK  you can specify a list to set and unset
With RTM_SETLINK  you can specify an individual name with a add or del op

notifications will always be RTM_NEWLINK with the full list.

The nested attribute can be structured differently.

Only thing is i am worried about increasing the size of link dump and
notification msgs.

What is the limit on the number of names again ?