netdev - Re: [PATCH net-next] rtnetlink: Honour NLM_F_ECHO flag in rtnl

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Date:   Thu, 22 Sep 2022 06:03:46 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Guillaume Nault <gnault@...hat.com>
Cc:     Hangbin Liu <liuhangbin@...il.com>, netdev@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Ido Schimmel <idosch@...dia.com>,
        Petr Machata <petrm@...dia.com>,
        Florent Fourcot <florent.fourcot@...irst.fr>,
        Nikolay Aleksandrov <razor@...ckwall.org>
Subject: Re: [PATCH net-next] rtnetlink: Honour NLM_F_ECHO flag in
 rtnl_{new, set}link

On Thu, 22 Sep 2022 13:09:51 +0200 Guillaume Nault wrote:
> That's why I complained when RTM_NEWNSID tried to implement its own
> notification mechanism:
> https://lore.kernel.org/netdev/20191003161940.GA31862@linux.home/
> 
> I mean, let's just use the built-in mechanism, rather than reinventing
> a new one every time the need comes up.

See, when you say "let's just use the built-in mechanism" you worry 
me again. Let's be clear that no new API should require the use of
ECHO for normal operation, like finding out what the handle of an
allocated object is.