From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4D67D395DB9; Wed, 3 Jun 2026 09:27:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780478849; cv=none; b=dbjORhxRaWg08Jsne8ZVfLLVQ56MPnvVd525oTsPP52t8Bh/jsbmvFQNYOfOT/8Va1+y5DweWuYS/WCz9PGuXogeAYH9XWUotikEtqU42tslzXiH9ZCkx58GWMDoXlBThczf2jxGZKsH3XsmlbzcNsYL2Fc2rzUU6r4d3a9oz+s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780478849; c=relaxed/simple; bh=odWU+nMmgrZPsGI6Xf9THDXw3O7NLl9Nsnlu+uV4Uo8=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=Whm9k/ES4NvSbAkaqN0xPP6mUTwKqwVZb7cUiXllGLeH+IhPiClbVSGfwjpiBu96W+jfBigJ8dj3hnvL2Mrc/QAxKalYBuF6oedRpMYUIP1e4knyvd9CxJB5NjjQOuC0odRk+ibmpmve2m+L1Dc8ppPIQyPW/1obhl8tHJw7UtY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=TKILIWfd; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="TKILIWfd" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 718561F00898; Wed, 3 Jun 2026 09:27:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1780478847; bh=D2Vmo6upMxKY5OWoPHtpqjiCYXj8F/9MoHUlPOVDBmw=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=TKILIWfd3KWnP8EFTrzOWIFHzUt1wYdP6k7N24Xi7uchwZMrvB5IB5Sy8tSV+8iN6 ABLqVv8R4iKCtYYlY7onZjCm1LVhN2oRjA8oFGOUA6YIR+j6lMX6Ajwzx4YrdZvt0a WxlvY/ztjkWns1xEXkxu01vkAsI6dLLCpUpRBIWFXFmDUMqPgRCwAVhaMMbAUQAiZO uCpJWBnml8k1p0vmY/EygAPnTnNssrQZj/UDDFgq7MBL71faLUifaOKrnu6XqGqxye jgGN7uCn4nO29K2ZY2W78aZQ0/DDsqbyFV+Nb9A8H90o8EHSlg0tH574n2SyV3ax5P sln/A4MS74phg== Message-ID: Date: Wed, 3 Jun 2026 19:27:17 +1000 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Beta Subject: Re: [PATCH net v2] Revert "ipv6: preserve insertion order for same-scope addresses" Content-Language: fr To: =?UTF-8?B?w43DsWlnbyBIdWd1ZXQ=?= Cc: Stefano Brivio , Fernando Fernandez Mancera , netdev@vger.kernel.org, yuhuang@redhat.com, justin.iurman@gmail.com, horms@kernel.org, pabeni@redhat.com, kuba@kernel.org, edumazet@google.com, davem@davemloft.net, idosch@nvidia.com, dsahern@kernel.org, Chris Adams , David Gibson , Beniamino Galvani , Thorsten Leemhuis , Andrew Lunn , regressions@lists.linux.dev References: <20260529112357.5079-1-fmancera@suse.de> <20260529134045.56330243@elisabeth> <5079261a-79e5-421b-bf6a-a511acaaeca4@kernel.org> <20260601153525.546746a8@elisabeth> <8e9cbf0a-caff-4575-afb7-fe852df8a51a@kernel.org> From: Matthieu Baerts Autocrypt: addr=matttbe@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit Hi Íñigo, On 03/06/2026 16:53, Íñigo Huguet wrote: > On Wed, Jun 3, 2026 at 7:46 AM Matthieu Baerts wrote: >> I guess it is safer not to break UAPI and not reapplying the patch, >> especially when there is no clear way to know which order is taken by >> the kernel. >> >> What about clearly stating that the default order is "random", except >> when an additional flag is set to sort them chronologically or the opposite? > > Stating that the order is "random" implies that someone will change > the default insertion order in the future, as the documentation says > that it's not UAPI. So they'll cause the UAPI breakage that we are > trying to avoid now. Moreover, if we consider the default order > "random" and state that userspace programs must not rely on it, why > can't we change it now? I was only suggesting "random", simply to force userspace programs to ask for a specific order when the order matters. But also to avoid having to describe the current order, which is different in v4 and v6 for entries of the same scope. I know the order is not random, and even if it is confusing, I don't think we can change it without breaking stuff. Cheers, Matt -- Sponsored by the NGI0 Core fund.