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Tue, 17 Feb 2026 16:21:08 +0000 Message-ID: <6c1c575b-9f47-446c-ba91-8491c1211670@intel.com> Date: Tue, 17 Feb 2026 17:19:07 +0100 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH bpf v3 7/9] libeth, idpf: use truesize as XDP RxQ info frag_size To: Larysa Zaremba CC: , Claudiu Manoil , "Vladimir Oltean" , Wei Fang , Clark Wang , Andrew Lunn , "David S. Miller" , Eric Dumazet , "Jakub Kicinski" , Paolo Abeni , Tony Nguyen , Przemek Kitszel , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , Stanislav Fomichev , "Andrii Nakryiko" , Martin KaFai Lau , "Eduard Zingerman" , Song Liu , Yonghong Song , KP Singh , Hao Luo , Jiri Olsa , Simon Horman , Shuah Khan , Maciej Fijalkowski , "Bastien Curutchet (eBPF Foundation)" , Tushar Vyavahare , Jason Xing , =?UTF-8?Q?Ricardo_B=2E_Marli=C3=A8re?= , Eelco Chaudron , Lorenzo Bianconi , "Toke Hoiland-Jorgensen" , , , , , , Aleksandr Loktionov , Dragos Tatulea References: <20260217132450.1936200-1-larysa.zaremba@intel.com> <20260217132450.1936200-8-larysa.zaremba@intel.com> From: Alexander Lobakin Content-Language: en-US In-Reply-To: <20260217132450.1936200-8-larysa.zaremba@intel.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: DUZPR01CA0006.eurprd01.prod.exchangelabs.com (2603:10a6:10:3c3::13) To DS0PR11MB8718.namprd11.prod.outlook.com (2603:10b6:8:1b9::20) Precedence: bulk X-Mailing-List: imx@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS0PR11MB8718:EE_|PH7PR11MB5861:EE_ X-MS-Office365-Filtering-Correlation-Id: e37919ab-73ce-44ec-9797-08de6e408e09 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|7416014|366016; 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It clearly expects whole buffer size instead > of DMA write size. Different assumptions in idpf driver configuration lead > to negative tailroom. > > To make it worse, buffer sizes are not actually uniform in idpf when > splitq is enabled, as there are several buffer queues, so rxq->rx_buf_size > is meaningless in this case. > > Use truesize of the first bufq in AF_XDP ZC, as there is only one. Disable > growinf tail for regular splitq. > > Fixes: ac8a861f632e ("idpf: prepare structures to support XDP") > Signed-off-by: Larysa Zaremba Acked-by: Alexander Lobakin Thanks for handling this! Olek