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Message-ID: <07f075bd-46a7-4298-953f-d0540759d694@kernel.org>
Date: Tue, 18 Nov 2025 11:18:34 -0700
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Subject: Re: [PATCH] net/ipv6: allow device-only routes via the multipath API
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To: azey <me@azey.net>
Cc: nicolasdichtel <nicolas.dichtel@6wind.com>,
 "David S. Miller" <davem@davemloft.net>, Eric Dumazet <edumazet@google.com>,
 Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
 Simon Horman <horms@kernel.org>, netdev <netdev@vger.kernel.org>,
 linux-kernel <linux-kernel@vger.kernel.org>
References: <a6vmtv3ylu224fnj5awi6xrgnjoib5r2jm3kny672hemsk5ifi@ychcxqnmy5us>
 <7a4ebf5d-1815-44b6-bf77-bc7b32f39984@kernel.org>
 <a4be64fb-d30e-43e3-b326-71efa7817683@6wind.com>
 <19a969f919b.facf84276222.4894043454892645830@azey.net>
 <e5e7b1cd-b733-40d5-9e78-b27a1a352cec@kernel.org>
 <19a97dce5fc.10e4ece0319525.6646442146487396729@azey.net>
From: David Ahern <dsahern@kernel.org>
In-Reply-To: <19a97dce5fc.10e4ece0319525.6646442146487396729@azey.net>
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On 11/18/25 9:47 AM, azey wrote:
> On 2025-11-18 17:04:38 +0100,  David Ahern <dsahern@kernel.org> wrote:
>> There is really no reason to take a risk of a regression. If someone
>> wants ecmp with device only nexthops, then use the new nexthop infra to
>> do it.
> 
> My initial reason was that device-only ECMP via `ip route` works with IPv4
> but not IPv6, so I thought it'd make sense to unify functionality - but if
> this is final I won't argue any further.
> 

There was a push many years ago to align v4 and v6 as much as possible.
Certain areas - like ipv6 multipath - proved to be too difficult and
ended up causing regressions.