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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: "netdev@vger.kernel.org" , ttoukan.linux@gmail.com From: Tariq Toukan Subject: MLX driver for host-to-ARM communication Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: FR4P281CA0373.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:f8::20) To MW6PR12MB7086.namprd12.prod.outlook.com (2603:10b6:303:238::20) 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: SA0PR12MB7090:EE_|DS7PR12MB8201:EE_ X-MS-Office365-Filtering-Correlation-Id: 3ec46031-70e8-47f1-3df4-08def9158bfe X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|376014|366016|1800799024|6133799003|56012099006|10067099003|11063799006|18002099003; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:SA0PR12MB7090.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(23010399003)(376014)(366016)(1800799024)(6133799003)(56012099006)(10067099003)(11063799006)(18002099003);DIR:OUT;SFP:1101; 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Could you confirm whether this series can be submitted in parallel with our regular mlx5 feature patches without conflicting with the 15-patch limit? It is to be placed in its own new directory: drivers/net/ethernet/mellanox/mlx5/nodnic/ Find more details below [1]. Regards, Tariq [1] net/mlx5: Introduce mlx5_nodnic driver for BF4 management PF BlueField-4 no longer includes the RSHIM hardware that previous BlueField generations relied on for host-to-ARM communication. In its place, the firmware exposes two dedicated management PFs — one facing the host side and one facing the ARM side — and configures steering rules to loop traffic between them, enabling host-to-ARM communication through standard networking interfaces. Add mlx5_nodnic, a lightweight driver for these management PFs. NODNIC (No DRAM NIC) is a lightweight interface intended to allow simple packet transmission for minimalistic drivers with a low memory footprint. The driver communicates with the firmware through PCI Vendor Specific Capability (VSC) — reads and writes over PCI config space, unlike mlx5_core which uses a DMA-based command interface. Each management PF exposes a single SQ and a single RQ that share one CQ. The interface configures two MSI-Xs: the data MSI-X fires on CQEs, driving both TX and RX completions; the event MSI-X notifies on port state changes, where the firmware brings the port up once both the host and ARM sides have gone up.