netdev - Re: [PATCH net-next v5] rtnetlink: add new RTM

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Date:	Tue, 19 Apr 2016 14:23:24 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	johannes@...solutions.net
Cc:	eric.dumazet@...il.com, roopa@...ulusnetworks.com,
	netdev@...r.kernel.org, jhs@...atatu.com, tgraf@...g.ch,
	nicolas.dichtel@...nd.com, egrumbach@...il.com
Subject: Re: [PATCH net-next v5] rtnetlink: add new RTM_GETSTATS message to
 dump link stats

From: Johannes Berg <johannes@...solutions.net>
Date: Tue, 19 Apr 2016 12:09:03 +0200

> At netconf, we talked about how awkward it can be that one doesn't know
> if an attribute was accepted by the kernel or simply ignored because
> it's not supported (older kernel version).
> 
> I considered (and Emmanuel has started to cook up a patch for it)
> adding a flag here meaning "reject if not parsed" (or so).
> 
> Now, I realize that with all the existing netlink commands one can't
> actually rely on that (since it requires some infrastructure), but new
> commands in existing families and also entirely new generic netlink
> families would allow let userspace rely on such a thing.

I like this nlattr flag idea, it's opt-in and any tool can be updated
to use the new facility.

I'd be willing the backport the nlattr flag bit change to all stable
releases as well.