From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 67DD51F956; Thu, 5 Jun 2025 14:12:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749132763; cv=none; b=N/CBO+1QalvdQBuNT0EYlfxh+uIHZ5aWYyZW1/oAMAyc64pDZRD+d1AUikDwSU8foLZIaZUeaqO758B0AP0V1aF4w/OFo32mfHC3gqbZoMKIMcKAHTKa50KdBOg5r7q09kJ42EvwRmFdR/c567FuZ0ZWyJG2k55Nswglo1BAMzk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749132763; c=relaxed/simple; bh=H84nLkI3ISIc0XZxOb82bQ47deaFwc09tK9XpfuXpoE=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=JaQ1gmuRV818SxXkndNfAAn1UWsOkmimPxFs4/wJj4DnrLBApSEFd+rm4tPk9HvlFmXFKTrux5md2xWfYAjrAbeWVNszJ3NnFj+4oXM9To8t8Qj8bvFDwOl7iKXT4sAt0uzuNvY7pWfE3vmz4hGGFierKf2/ClcNXCiHPssCG88= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=mQP5nU+k; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="mQP5nU+k" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D653BC4CEE7; Thu, 5 Jun 2025 14:12:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1749132761; bh=H84nLkI3ISIc0XZxOb82bQ47deaFwc09tK9XpfuXpoE=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=mQP5nU+k5wknXL42DeCVSwgqclJwF6QQTDEopazgpCVt+hNmNOatPq2mNu5ws0ao8 fygyVWFQw8KoAwpPAoafke3rJbZHbqWcqubQlfN0LYbCrvYl6hbYZTP3OPEJJTFfMR aHSTqBhhGlRJWYhZAq2ZchIH/ozI8zlYmDW2AFg8aN+p/ksp+4n4ttHpv3aw/xUKzR k2kpQHdYwZbrB2AakLVZYJH3mylXJkhk1fFGQCYdagZ2a0B9YepamAOt+hW1W8+4xT u+h6NC9dPyvb7ZTxBa1XCNUk70Ic9CY70hcOZAf4s2apqwiz1Jwd6WEi5frkXV7yZw L3fr1IPXpptTA== Date: Thu, 5 Jun 2025 07:12:40 -0700 From: Jakub Kicinski To: Jinjian Song Cc: andrew+netdev@lunn.ch, angelogioacchino.delregno@collabora.com, chandrashekar.devegowda@intel.com, chiranjeevi.rapolu@linux.intel.com, corbet@lwn.net, danielwinkler@google.com, davem@davemloft.net, edumazet@google.com, haijun.liu@mediatek.com, helgaas@kernel.org, horms@kernel.org, johannes@sipsolutions.net, korneld@google.com, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org, loic.poulain@linaro.org, m.chetan.kumar@linux.intel.com, matthias.bgg@gmail.com, netdev@vger.kernel.org, pabeni@redhat.com, rafael.wang@fibocom.com, ricardo.martinez@linux.intel.com, ryazanov.s.a@gmail.com Subject: Re: [net-next v1] net: wwan: t7xx: Parameterize data plane RX BAT and FAG count Message-ID: <20250605071240.7133d1a5@kernel.org> In-Reply-To: <20250520122141.025616c9@kernel.org> References: <20250514104728.10869-1-jinjian.song@fibocom.com> <20250515180858.2568d930@kernel.org> <20250516084320.66998caf@kernel.org> <20250520122141.025616c9@kernel.org> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Wed, 4 Jun 2025 17:17:22 +0800 Jinjian Song wrote: > The parameters are used by data plane to request RX DMA buffers for the entrire lifetime of > the driver, so it's best to determine them at the driver load time. Adjusting them after the > driver has been probed could introduce complex issues (e.g., the DMA buffers may already be > in use for communication when the parameters are changed. While devlink appears to support > parameter configuration via driver reload and runtime adjustment, both of these occur after > the driver has been probed, which doesn't seem very friendly to the overall logic. no. 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?PGXmFVjQB6JpiPLQXgARI36F8ivVaFwYVOZRPKBJSBxN3WbMS3R4h8l/USQF?= =?us-ascii?Q?mkW+DMsQ42BawgBowHA6SlUevs138XbDRkGFdvUmimMVH1TIQ5Si04C110pB?= =?us-ascii?Q?vmMPnKjXpcvG2eFAoQwoYngmZOS+dZYaeFf2hX4rkgF2VQkkghONHOaIRIM2?= =?us-ascii?Q?jbNOSYh0y06DfL8l/dRhaq13/DBVftKCGZqoq0pexbeO6DKe+FMo8lBFgE6e?= =?us-ascii?Q?zIR3XY6rM5CpQWCq/QZR57HypeR4k/2aB5BqeQnLhlnQTBc4ha8yLcH5ZRPI?= =?us-ascii?Q?YOxj4soG91Vurg3HO/Td58UISpH35wN5BlAUFATSo5IJYHpf+r0Di5eBKx7R?= =?us-ascii?Q?YlggG2gECgc8IOHL6GV3O5IQWFjfd0/38QhhtWsa37VNgYsULL3dqP7zAgO7?= =?us-ascii?Q?a7tijrZgztGhHq+veCIZUoeSuYuw8s7O9/f1e7Q/BhRDM2uPeaFzHl5tA9WU?= =?us-ascii?Q?So1d9/HJES+rB4j/023vUnhJe4AWs3viXBH8lfAn0DjFQn8cJODs/Ddmc2aR?= =?us-ascii?Q?GZSuPRNWoCjJcKr7W7pdZEbBuAN76vjH31Di/f4ciCqMT3edM9sZom1dOM/I?= =?us-ascii?Q?KMfw5IoLoYnFs9eiwdJNddv37KRZ2TEVxqIcfz86275bgkvxSRQx7SNsQnED?= =?us-ascii?Q?DDmHeIgLkWPLuJB4qX7Rh8e9iN8c/wjgXRqI+9xGw+S2PfXiw6O2+66K7eia?= =?us-ascii?Q?CBgpS5rMH0ICANKKXBPqKMdM1iyKRwIpVrElk/cNbG5QOvC9oRdkFCIaofvd?= =?us-ascii?Q?XVgIs9B3msPMNbhGqV1MtObBLm68RAEXYk3pYSldzzV4sTl1kwqjxpFhqPMt?= =?us-ascii?Q?FpfoWA2pmqy3DH8798IZ17C/u+J2rogYmDObBHDayyobvRLsNDzMMs+/LLGS?= =?us-ascii?Q?HcIEhj3F9Zf9LdKrH64r3NucM2kaXOanddi8Jwrw9EV25ldOwGHgdoe4TxYj?= =?us-ascii?Q?JuQYxAspsk3EoHkcSvfiAdWvKtjq/bbx7sbDHAvEqrsliEiae+c5Owe50Ojb?= =?us-ascii?Q?fYtm8CyGuytVPh1RddkJM6k20vh6ejx1/EVv5TCc8HnpYmG24fIRhbM076TS?= =?us-ascii?Q?H9ADe3Ooope4TgDxxhtuy0lQAvm91WoFpiP1YJFqlzgD5DmeE8k/y+CXc9D3?= =?us-ascii?Q?+qR63tjYl9A3aLHSYpn/xKtQlFxcZhT8rkBVbcr5jzR0Dm7R9CC0VYAF/y3w?= =?us-ascii?Q?6ZoSj+t3uRVZeKpbw5HMH2yT7HFSlx1JabUU/n5t90MnNzhmlZTKXxMz6mmZ?= =?us-ascii?Q?StjdpDsrfpfFlkXLiTG1FcoxppD9v5sxTq/gL/3kNWXOoiY6moYedn0hAxtu?= =?us-ascii?Q?y0MStqek3AJtNFMDhY+RQNN2mMbw1W0qoOrXY/xkrVBh7psBe2hqrR/6pQG/?= =?us-ascii?Q?W+xFpC0wMJeL67EU1yaYsztdYL7uxNvFSL2Pxnp8yteb0bw2JG1J1vsmw0BO?= =?us-ascii?Q?BQH0bmJr0Sc05BB3iNRNjbUXPg8CL6F+QJPqMyqPSL0ln45Gq+81XmQstTKJ?= =?us-ascii?Q?IcFdivMxCnKJbvPD3vkFNMuC31m4LnXNOw0ElIX1BNSP1KvH6wzvS8FLtgFO?= =?us-ascii?Q?yVzPb0CAimEapzp10gYOgj+PEnH/pz49FE5trc48dABw6BsgwfRN9McilhrJ?= =?us-ascii?Q?0w=3D=3D?= X-OriginatorOrg: fibocom.com X-MS-Exchange-CrossTenant-Network-Message-Id: 48427f90-6ee8-4e4a-da48-08dda4e10e53 X-MS-Exchange-CrossTenant-AuthSource: TY0PR02MB5766.apcprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Jun 2025 10:01:07.7221 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 889bfe61-8c21-436b-bc07-3908050c8236 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: Dfl5Rtpq1KKiZxCWbz0E/oDuOPHyQcOJabcue24b1Pg3M8+rdKxGVxa4cbBMlznaqbQf3tNLoT3GNFq+c2gwEwaKpZqMduCx5mNoljTiFmQ= X-MS-Exchange-Transport-CrossTenantHeadersStamped: TYSPR02MB7321 Message-ID: <20250606100050.5LHpn6tRg6mRiQ-kda_S-pQ3AptzppeIqpHeq_Pk9n4@z> From: Jakub Kicinski >On Wed, 4 Jun 2025 17:17:22 +0800 Jinjian Song wrote: >> The parameters are used by data plane to request RX DMA buffers for the entrire lifetime of >> the driver, so it's best to determine them at the driver load time. Adjusting them after the >> driver has been probed could introduce complex issues (e.g., the DMA buffers may already be >> in use for communication when the parameters are changed. While devlink appears to support >> parameter configuration via driver reload and runtime adjustment, both of these occur after >> the driver has been probed, which doesn't seem very friendly to the overall logic. > >no. > Hi Jakub, Could we configue this parameter of mtk_t7xx through Kconfig? Thanks. Jinjian, Best Regards.