netdev - Re: [PATCH v2] net/ipv6: allow device-only routes via the multipath API

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Message-ID: <56a0ec5c-da92-4f92-9697-71127866049b@6wind.com>
Date: Fri, 28 Nov 2025 17:28:41 +0100
From: Nicolas Dichtel <nicolas.dichtel@...nd.com>
To: azey <me@...y.net>
Cc: Jakub Kicinski <kuba@...nel.org>, David Ahern <dsahern@...nel.org>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>,
 netdev <netdev@...r.kernel.org>, linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] net/ipv6: allow device-only routes via the multipath
 API

Le 28/11/2025 à 16:54, azey a écrit :
>> On 2025-11-28 09:38:07 +0100  Nicolas Dichtel <nicolas.dichtel@...nd.com> wrote:
>>> With IPv6, unlike IPv4, the ECMP next hops can be added one by one. Your commit
>>> doesn't allow this:
> 
> Hold on, I think I understand what you actually meant by this, sorry.
> I got too focused on regressions from the discussion in v1, I'll make
> a v3 of the patch that allows dev-only routes to be added via append.
Yes, that is what I pointed out.

Please, add some self-tests to show that there is no regression. You probably
have to test different combinations of NLM_F_* flags. See:

https://git.kernel.org/pub/scm/network/iproute2/iproute2.git/tree/ip/iproute.c#n2418