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dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=nvidia.com; Received-SPF: Pass (protection.outlook.com: domain of nvidia.com designates 216.228.117.160 as permitted sender) receiver=protection.outlook.com; client-ip=216.228.117.160; helo=mail.nvidia.com; pr=C Received: from mail.nvidia.com (216.228.117.160) by SA2PEPF00003F66.mail.protection.outlook.com (10.167.248.41) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9769.17 via Frontend Transport; Thu, 16 Apr 2026 21:27:25 +0000 Received: from rnnvmail201.nvidia.com (10.129.68.8) by mail.nvidia.com (10.129.200.66) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.20; Thu, 16 Apr 2026 14:27:10 -0700 Received: from dev.nvidia.com (10.126.231.37) by rnnvmail201.nvidia.com (10.129.68.8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.20; Thu, 16 Apr 2026 14:27:09 -0700 From: Chaitanya Kulkarni To: , , , , , , CC: , , , Chaitanya Kulkarni Subject: [PATCH V3 2/3] md: propagate BLK_FEAT_PCI_P2PDMA from member devices to RAID device Date: Thu, 16 Apr 2026 14:26:32 -0700 Message-ID: <20260416212633.72650-3-kch@nvidia.com> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20260416212633.72650-1-kch@nvidia.com> References: <20260416212633.72650-1-kch@nvidia.com> Precedence: bulk X-Mailing-List: linux-raid@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: rnnvmail202.nvidia.com (10.129.68.7) To rnnvmail201.nvidia.com (10.129.68.8) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA2PEPF00003F66:EE_|MW6PR12MB7088:EE_ X-MS-Office365-Filtering-Correlation-Id: b9ab3924-0f74-47cb-6341-08de9bfef462 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|376014|1800799024|82310400026|56012099003|18002099003|22082099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 2TI8zW0jFhQZwVBRiyAsj0NpIx6qKYUuUb0AF8kqy8nr0ljT6+03YlHJU3vz1jgwa72v7bck3RZinrBdsiacRuKiL1iwGrGkOc78+D22YKWjotNNxfwowyhKDNI1OfrvEDUkYRTtN3Z7aNpubKwiFcx1EAZvbsbufNvELn/mnDhz/4Z7UDkN5GDjrrjuvy39SkD6CswnegMf0wkxXENF/FT9K2iUXr2bh7gZn+Ctv1jFvAfzm8OWKNaWAiMTjSajRzN+Jd81+iH/ssdqijTXFRQ0WfXThPc+LqM6YX831Q/Me/cWCNKeDW+FXgs0YNoxNDgSXU3Hzh6/Wg+NIjHC0aVcU4se6OxMcsgmRhEBGoY+lWSVkX1rp/lh5GZl0y0SodAC5Ahfcy/M5cXeuIFOftTT6eODI2v6uBbxwL8Eso4YcPBFUg+btnUkIXnzfUs/ X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Apr 2026 21:27:25.5971 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b9ab3924-0f74-47cb-6341-08de9bfef462 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SA2PEPF00003F66.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW6PR12MB7088 From: Kiran Kumar Modukuri MD RAID does not propagate BLK_FEAT_PCI_P2PDMA from member devices to the RAID device, preventing peer-to-peer DMA through the RAID layer even when all underlying devices support it. Enable BLK_FEAT_PCI_P2PDMA unconditionally in raid0, raid1 and raid10 personalities during queue limits setup. blk_stack_limits() clears it automatically if any member device lacks support, consistent with how BLK_FEAT_NOWAIT and BLK_FEAT_POLL are handled in the block core. Parity RAID personalities (raid4/5/6) are excluded because they require CPU access to data pages for parity computation, which is incompatible with P2P mappings. Tested with RAID0/1/10 arrays containing multiple NVMe devices with P2PDMA support, confirming that peer-to-peer transfers work correctly through the RAID layer. Signed-off-by: Kiran Kumar Modukuri Signed-off-by: Chaitanya Kulkarni --- drivers/md/raid0.c | 1 + drivers/md/raid1.c | 1 + drivers/md/raid10.c | 1 + 3 files changed, 3 insertions(+) diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c index 5e38a51e349a..2cdaf7495d92 100644 --- a/drivers/md/raid0.c +++ b/drivers/md/raid0.c @@ -392,6 +392,7 @@ static int raid0_set_limits(struct mddev *mddev) lim.io_opt = lim.io_min * mddev->raid_disks; lim.chunk_sectors = mddev->chunk_sectors; lim.features |= BLK_FEAT_ATOMIC_WRITES; + lim.features |= BLK_FEAT_PCI_P2PDMA; err = mddev_stack_rdev_limits(mddev, &lim, MDDEV_STACK_INTEGRITY); if (err) return err; diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index ba91f7e61920..422ad4786569 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -3215,6 +3215,7 @@ static int raid1_set_limits(struct mddev *mddev) lim.max_hw_wzeroes_unmap_sectors = 0; lim.logical_block_size = mddev->logical_block_size; lim.features |= BLK_FEAT_ATOMIC_WRITES; + lim.features |= BLK_FEAT_PCI_P2PDMA; err = mddev_stack_rdev_limits(mddev, &lim, MDDEV_STACK_INTEGRITY); if (err) return err; diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index 4901ebe45c87..07a5b734c8f3 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -3939,6 +3939,7 @@ static int raid10_set_queue_limits(struct mddev *mddev) lim.chunk_sectors = mddev->chunk_sectors; lim.io_opt = lim.io_min * raid10_nr_stripes(conf); lim.features |= BLK_FEAT_ATOMIC_WRITES; + lim.features |= BLK_FEAT_PCI_P2PDMA; err = mddev_stack_rdev_limits(mddev, &lim, MDDEV_STACK_INTEGRITY); if (err) return err; -- 2.39.5