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Wed, 4 Feb 2026 22:55:56 +0000 Message-ID: <9d3d6128-41fb-4f72-acca-3bb9d6798e3c@intel.com> Date: Wed, 4 Feb 2026 14:55:56 -0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net-next V2 1/2] net/mlx5e: RX, Drop oversized packets in non-linear mode To: Tariq Toukan , Eric Dumazet , Jakub Kicinski , Paolo Abeni , "Andrew Lunn" , "David S. Miller" CC: Saeed Mahameed , Mark Bloch , "Leon Romanovsky" , , , , Gal Pressman , Dragos Tatulea , Cosmin Ratiu , Moshe Shemesh References: <20260203072130.1710255-1-tariqt@nvidia.com> <20260203072130.1710255-2-tariqt@nvidia.com> Content-Language: en-US From: Jacob Keller In-Reply-To: <20260203072130.1710255-2-tariqt@nvidia.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4PR03CA0172.namprd03.prod.outlook.com (2603:10b6:303:8d::27) To DS0PR11MB7579.namprd11.prod.outlook.com (2603:10b6:8:14d::5) 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: DS0PR11MB7579:EE_|PH3PPF1BAF94C4A:EE_ X-MS-Office365-Filtering-Correlation-Id: 47ac70ad-cc1a-46b5-742d-08de64408e8f X-LD-Processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|376014|7416014|7053199007; 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This can happen for Multi Host configurations where each > port has a different MTU. > > Current behavior: > > 1) Striding RQ in linear mode drops the packet in SW and counts it > with oversize_pkts_sw_drop. > > 2) Striding RQ in non-linear mode allows it like a normal packet. > > 3) Legacy RQ can't receive oversized packets by design: > the RX WQE uses MTU sized packet buffers. > > This inconsistency is not a violation of the netdev policy [1] > but it is better to be consistent across modes. > > This patch aligns (2) with (1) and (3). One exception is added for > LRO: don't drop the oversized packet if it is an LRO packet. > The doc also says that the preference is to drop packets, so this makes sense. > As now rq->hw_mtu always needs to be updated during the MTU change flow, > drop the reset avoidance optimization from mlx5e_change_mtu(). > > Extract the CQE LRO segments reading into a helper function as it > is used twice now. > > [1] Documentation/networking/netdevices.rst#L205 > > Signed-off-by: Dragos Tatulea > Signed-off-by: Tariq Toukan > --- Reviewed-by: Jacob Keller