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CAT:NONE; SFS:(4636009)(36840700001)(46966006)(6916009)(356005)(54906003)(4326008)(6286002)(7696005)(107886003)(8936002)(7636003)(1076003)(316002)(36860700001)(6666004)(47076005)(82310400003)(5660300002)(16526019)(2906002)(186003)(26005)(336012)(86362001)(83380400001)(426003)(36756003)(70586007)(55016002)(8676002)(70206006)(508600001)(2616005); DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Oct 2021 15:06:27.3565 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 2bb252ca-0028-4254-3a13-08d98fed5cae 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: CO1NAM11FT066.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW3PR12MB4426 Subject: [dpdk-stable] [PATCH v2 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. Fixes: bff735011078 ("vdpa/mlx5: prepare virtio queues") 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