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dpdk.org; dkim=none (message not signed) header.d=none;dpdk.org; dmarc=pass action=none header.from=nvidia.com; Received-SPF: Pass (protection.outlook.com: domain of nvidia.com designates 216.228.112.34 as permitted sender) receiver=protection.outlook.com; client-ip=216.228.112.34; helo=mail.nvidia.com; Received: from mail.nvidia.com (216.228.112.34) by DM6NAM11FT057.mail.protection.outlook.com (10.13.172.252) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.20.4608.15 via Frontend Transport; Fri, 15 Oct 2021 13:43:48 +0000 Received: from nvidia.com (172.20.187.5) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1497.18; Fri, 15 Oct 2021 13:43:44 +0000 From: Xueming Li To: Maxime Coquelin , CC: , , Matan Azrad , Viacheslav Ovsiienko Date: Fri, 15 Oct 2021 21:43:18 +0800 Message-ID: <20211015134319.1664761-1-xuemingl@nvidia.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210923081758.178745-1-xuemingl@nvidia.com> References: <20210923081758.178745-1-xuemingl@nvidia.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [172.20.187.5] X-ClientProxiedBy: HQMAIL105.nvidia.com (172.20.187.12) To HQMAIL107.nvidia.com (172.20.187.13) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: ec125df9-a6e4-4a4c-826e-08d98fe1d134 X-MS-TrafficTypeDiagnostic: MWHPR12MB1776: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:475; 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CAT:NONE; SFS:(4636009)(46966006)(36840700001)(6286002)(426003)(2616005)(6666004)(26005)(86362001)(8676002)(82310400003)(70206006)(8936002)(16526019)(4326008)(336012)(186003)(2906002)(36860700001)(55016002)(36756003)(110136005)(5660300002)(47076005)(7696005)(356005)(316002)(107886003)(1076003)(83380400001)(7636003)(70586007)(508600001)(54906003); DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Oct 2021 13:43:48.8691 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ec125df9-a6e4-4a4c-826e-08d98fe1d134 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a; Ip=[216.228.112.34]; Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT057.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR12MB1776 Subject: [dpdk-stable] [PATCH v1 1/2] vdpa/mlx5: workaround FW first completion in start X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: patches for DPDK stable branches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: stable-bounces@dpdk.org Sender: "stable" After a vDPA application restart, qemu restores VQ with used and available index, new incoming packet triggers virtio driver to handle buffers. Under heavy traffic, no available buffer for firmware to receive new packets, no Rx interrupts generated, driver is stuck on endless interrupt waiting. As a firmware workaround, this patch sends a notification after VQ setup to ask driver handling buffers and filling new buffers. Cc: stable@dpdk.org Signed-off-by: Xueming Li Reviewed-by: Matan Azrad --- drivers/vdpa/mlx5/mlx5_vdpa_virtq.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/vdpa/mlx5/mlx5_vdpa_virtq.c b/drivers/vdpa/mlx5/mlx5_vdpa_virtq.c index f530646058f..71470d23d9e 100644 --- a/drivers/vdpa/mlx5/mlx5_vdpa_virtq.c +++ b/drivers/vdpa/mlx5/mlx5_vdpa_virtq.c @@ -4,6 +4,7 @@ #include #include #include +#include #include #include @@ -367,6 +368,9 @@ mlx5_vdpa_virtq_setup(struct mlx5_vdpa_priv *priv, int index) goto error; } virtq->stopped = false; + /* Initial notification to ask qemu handling completed buffers. */ + if (virtq->eqp.cq.callfd != -1) + eventfd_write(virtq->eqp.cq.callfd, (eventfd_t)1); DRV_LOG(DEBUG, "vid %u virtq %u was created successfully.", priv->vid, index); return 0; -- 2.33.0