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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Nikolay Aleksandrov , David Ahern , Shuah Khan , Andy Roulin , Yong Wang , Petr Machata , Ujjal Roy , bridge@lists.linux.dev, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: Re: Please backport bridge multicast exponential field encoding fix series to 6.1.y/6.6.y/6.12.y/6.18.y/7.0.y Message-ID: <20260719082223.GA1899043@shredder> References: <2026070925-delay-gauntlet-bc7c@gregkh> <2026070954-activist-left-8303@gregkh> <2026070948-lively-exchange-a458@gregkh> <14350a31-ffc7-41fd-84d3-6cfb2cb96841@lunn.ch> <797773e2-b155-451b-ae97-e8a005fd2d86@lunn.ch> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: FR4P281CA0412.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:d0::20) To SA3PR12MB7901.namprd12.prod.outlook.com (2603:10b6:806:306::12) Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA3PR12MB7901:EE_|CY5PR12MB6347:EE_ X-MS-Office365-Filtering-Correlation-Id: 623cec07-355f-4cda-7367-08dee56ee16d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|7416014|366016|23010399003|18002099003|22082099003|10067099003|4143699003|56012099006|11063799006; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?C+xqHWqWTzLehW3+Wmuoj8/9Rf6aV1wqQTuWYfzsuXTMyMn+QFvxfzsuKP3C?= =?us-ascii?Q?jzEHLShqNEczxkxf3BJ609EeVXsBJc+j0xj6oNy/memJPbTS7gwVT884eAQr?= =?us-ascii?Q?WglT+Cr90qbBEtHkTIbWI7LoUZMeeSF4CFxqwl2Yo8aTgFBhuIf4bhT6pijD?= =?us-ascii?Q?QhrdC/BkUfgl+wke7QOl8fRcN9jkaWNFvZLALrdlwj9RJfLKm8BKzdSCR9xD?= =?us-ascii?Q?EkOml8Futms9KVJJCEjoDZnJTvfhPUZfp6Sy56Fi68imXFeH1IUR8lheoM/j?= =?us-ascii?Q?x3t8PYf+PiJb2fceRZQ8mLl9IoA1gfLNJ5GTzVzpVdMjXGeE5Lc4nIphzu1H?= =?us-ascii?Q?ak6yOokS6FgjjihRXd+Is8FSpbmwEVAS+ZgNfi3i23F9pMGFJ57ePq77NkCB?= =?us-ascii?Q?AT3xV81iUY/FksoVQ03Ifgp6N0t7hDRFyYhd9OqbvUDRAitpK93Ks55Vb/kc?= =?us-ascii?Q?1jI5H87LpiWIFrVhphU+ndy9OdVVMyPJ3Qd4KCyxtX6lnn501OFAIxa+7uff?= =?us-ascii?Q?8FrIDl+mUvp1iPYk/ZizkGr/1m4+QSmy9G+g5OCFbsfehM4p3kw7dp9Dp851?= =?us-ascii?Q?j/LK5ATATPYe/4nZB3DGjm69EmWtYQQjhwnRHSc8SCQppCZ6pOhfnY7K2Eyk?= =?us-ascii?Q?bCIXSujEARyDIQQjelHMsIZdu0ga3fgv8QBZHfygLkBxjIEt3AVDBcjGysSb?= =?us-ascii?Q?PeJ+4jWbZorYa9dU/z5azCaEdLuuL/jM7G66fnljiFM4/agYywcvYr/xE4+l?= =?us-ascii?Q?lGl0FaI08hAJH3yqlHZMlzuwODTWB2iGSBaW43r3F2Lv/qcSUrwbuxzqbLrd?= =?us-ascii?Q?lW4F2jAbZz+cZAKsK/0NglMVfpgRXYohSSoW/eM3IIMVutu1sz3fX2ezmfVg?= =?us-ascii?Q?UAyK04c9LVDP0hjCFNnnwNS1+cZgAJhYOYy2NnVvcLSBZV+beNvORS2h1P9i?= =?us-ascii?Q?G2YOHITbhpUTiilpZyxhqyoF6CZcX+uU2KzhKRJauKSRwWrUtduhuDmGfgX3?= =?us-ascii?Q?4ta4ImgIeXJdVpPhv5M2jjE2s7CUOvoOhoZKovl/GfbV69E2RtCB1UGP9MHW?= =?us-ascii?Q?b0oCI49fStVkFZm2TEHcc6c1FNZRweEbSjiD0wPkyzbQVYAhzQT9QMjVUdp1?= =?us-ascii?Q?PZxayCa7/hyKbLsCJ62PYTNr4ojurexMfkOFsB9/FoI65W6ke9Ubb6B2chGL?= =?us-ascii?Q?eftdYKSLVxsMCzyj9KR9K+9L7+zgKu0MGbDTRqhSgF3XA0uGxTCSuh6rtSTe?= =?us-ascii?Q?Ga1F/lFDvaULtf8gyA76x1SXAdN3Dhvn/3h6Z86LD5p2RRfCp0EPHnus5Ui2?= =?us-ascii?Q?uxs4vHkcDfmokmSC0dtrYXC17YyVH7Xk+Z5Oxy11WCqIBo/kmbhdq2P3UXXB?= =?us-ascii?Q?l0/gcGDJynMs2drwU6xUGzADXLrGVDWfM5BebcqbTmvs8Br9hCPm1XkIslkQ?= =?us-ascii?Q?TMsRZBT98GGL4ehrO9Fodx+vYUoeuiOBsewb808jfJpnalN4sOIkAg2iLiAQ?= =?us-ascii?Q?f9Aom49SbYfnHjsSz0X44J53NMEEEqM0hm18f8Vs3Szf6lPL8CQGoDSe9bXC?= =?us-ascii?Q?AKF5TUm7HB6ThaXGfUzKMXgpj6bxpggDSr1sqjVr7lnn3BbzCIlBdu+mmJ0T?= =?us-ascii?Q?8CWThRYT3OlSQ+zNCbjbEXM/S18zffSGbjeIoarZjMHrEmON5VmEwK/Pdspb?= =?us-ascii?Q?8xLncN1YTTl5ktXiF5DKPEfi+uzHFr8GA7JLDqRLOYrdBr/C?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 623cec07-355f-4cda-7367-08dee56ee16d X-MS-Exchange-CrossTenant-AuthSource: SA3PR12MB7901.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Jul 2026 08:22:32.6221 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: eDvU+ldpk91L/cdllvEhg63X1s1zVBfFYERgVF8tTp2gTzSrRULagSfHpjAcT2wD69XahQaw16WFAXM53UvHgA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY5PR12MB6347 On Fri, Jul 17, 2026 at 04:12:09PM +0530, Ujjal Roy wrote: > > It does not force the users to use a value < 128. You would need to > > return EINVAL for that, which i'm not proposing. Returning an error > > could break user space. > > > > While I understand that clamping avoids breaking user space, silently > modifying the value might lead to unexpected behavior that is > difficult for users to debug. > Because of these side effects, I am hesitant to proceed without the > Multicast maintainer's input. We should raise an open issue on this > topic to get their official decision, otherwise my preference is to > ignore patching this for the stable kernel versions entirely. We asked to target these patches at net-next because they don't fix a regression (the encoding never worked correctly), so they are not relevant for stable. Users that require this functionality should upgrade to a new kernel that contains the patches. Regarding the stable-specific patch, in my experience, stable maintainers don't accept such patches and prefer to backport patches from upstream, even if it results in more changes.