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Mon, 22 Jun 2026 12:16:21 +0000 Date: Mon, 22 Jun 2026 13:16:16 +0100 From: Bruce Richardson To: David Marchand CC: Raghavendra Ningoji , , "Thomas Monjalon" , Bhagyada Modali , Robin Jarry , , Chengwen Feng Subject: Re: [PATCH v2 1/3] dma/ae4dma: introduce AMD AE4DMA DMA PMD Message-ID: References: <20260518181856.1228373-1-raghavendra.ningoji@amd.com> <20260525184244.1758825-1-raghavendra.ningoji@amd.com> <20260525184244.1758825-2-raghavendra.ningoji@amd.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: DUZPR01CA0146.eurprd01.prod.exchangelabs.com (2603:10a6:10:4bd::9) To IA3PR11MB9421.namprd11.prod.outlook.com (2603:10b6:208:578::9) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA3PR11MB9421:EE_|PH0PR11MB7542:EE_ X-MS-Office365-Filtering-Correlation-Id: 059985aa-f3d9-4e91-cb27-08ded05811e3 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; ARA:13230040|366016|23010399003|376014|1800799024|56012099006|11063799006|6133799003|4143699003|22082099003|18002099003; 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An AE4DMA engine exposes 16 hardware command > > queues, each with a 32-entry descriptor ring; the PMD maps each > > hardware channel to its own dmadev with a single virtual channel, > > so a PCI function appears as 16 dmadevs named "-ch0" .. > > "-ch15". > > I am not familiar with DMA drivers, I am not sure it is something acceptable. > @Chengwen for info. > This is similar with what is done by idxd driver when used as a PCI device bound to vfio. We make the number of channels to configure a devarg, and each channel becomes its own dmadev instance, since each channel is independent from a user viewpoint. Only difference is that we use "q" rather than "ch" in the naming. See [1] for what idxd does. /Bruce [1] https://github.com/DPDK/dpdk/blob/main/drivers/dma/idxd/idxd_pci.c#L326