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Mon, 17 Jun 2024 08:09:10 -0700 From: Dragos Tatulea Date: Mon, 17 Jun 2024 18:07:56 +0300 Subject: [PATCH vhost 22/23] vdpa/mlx5: Don't reset VQs more than necessary Precedence: bulk X-Mailing-List: linux-rdma@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <20240617-stage-vdpa-vq-precreate-v1-22-8c0483f0ca2a@nvidia.com> References: <20240617-stage-vdpa-vq-precreate-v1-0-8c0483f0ca2a@nvidia.com> In-Reply-To: <20240617-stage-vdpa-vq-precreate-v1-0-8c0483f0ca2a@nvidia.com> To: "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , =?utf-8?q?Eugenio_P=C3=A9rez?= , Saeed Mahameed , Leon Romanovsky , Tariq Toukan , Si-Wei Liu CC: , , , , Dragos Tatulea , Cosmin Ratiu X-Mailer: b4 0.13.0 X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PEPF00002310:EE_|SA0PR12MB4464:EE_ X-MS-Office365-Filtering-Correlation-Id: bbeef19e-ced2-490c-0601-08dc8edf7c84 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230037|1800799021|376011|7416011|36860700010|82310400023; X-Microsoft-Antispam-Message-Info: =?utf-8?q?5CV6Itl7oCuvEjAXGhRL5j6jspCJbOO?= =?utf-8?q?Viz5iaDxeGj54+CZ+ZqOa/IagQe8I45PoEiA2Kwmgm1Wld52B851yTV+FuuvQ5lEk?= =?utf-8?q?4sLyEEpVwWW9RYw2DHmD+gVvAjkVIThgL5E7v/6YkdfXZWLgLbJYStCP3JfGIZk45?= =?utf-8?q?cTxv9Dly3USjbC8xvWorKTuLOpGH9OXhlN3ywMaVmeQ5kSfLqmCxU3zgB1M/+4w8k?= =?utf-8?q?zU+1FkDbgu4MNvSEVG5bWD2A5RWVhbK0kzO9i9I9RV0uPvs1BD0MgNddHYHL6HxwU?= =?utf-8?q?2PPjMpPxTUd4xct2TGdoTwOkxRxPBsiQbvbS18eSv/FHxRtCdW3XVjXrvfTZLtfe6?= =?utf-8?q?3JpMWT4sNozTSnhmueAJ3vbY+zjiFIohcafbPUGfkPEeWBD+w72MRvUfnMO0L7ltM?= =?utf-8?q?IS0yOdgdcr29ZFA7BFW+J34vR/iXbjGBkv20DsjFRxpGeKaj9Jl2W080R1Ah6QhU8?= =?utf-8?q?WMAJpOcFJF1PbRpYnv3FSg46MPR8l4jBBKsswkOga+Wi2b/8COdkcuTS1cZZ4VNLd?= =?utf-8?q?FdqNA9J4wstB6+So5LW3rhY5knwe0OoQfgLjOeZe7HpT1GcF/q9XUJxZJP69VqwV4?= =?utf-8?q?RGQEVFQSp7o876Da3mdoEDEwPKRyKOPXjk6S69HJphilXg3YiGXGF3cZeVGDAa4A4?= =?utf-8?q?7xXNe2R80SIPBOI2ChsxxSuPMWrfX4l0+3Bt9BG1XuZYESuui1lQxSDKcEer5ahDz?= =?utf-8?q?CwDKUvuY1FKRYhKccod2qoNHxCfN9GM+nqCqmse/ngiHKsrH64b6xJ1KXZgBATj8K?= =?utf-8?q?f40biw5JfDKYiLANBWmNi6i2tFJUY+KxdAcEsJDRXzIya6e/anoMuHHv3jy5biakb?= =?utf-8?q?ewJ8MHYf2tOyZdnA0sHGdbTGUMX5jDiZRgP1FbgeZL1wdImV8qOjuc+02+SlDWkuS?= =?utf-8?q?PeFOT7qegyOfgsJ2xjDBkCuO79Wd/Fyyz44fliHSPXxFCoWoiiqcOOjjp5YDqE84k?= =?utf-8?q?wZHuwKgQCjSQB/PTZ8CCxILgzwrjt70kKNwCUwqgOFyRMV6hf96qdyVlxTLro0K2X?= =?utf-8?q?bohe3jYfVn6naHby/gsu4t6X5FlNJ2ajLmnryXXQKYg7tfsBl92GfMBTQnUcpLgYK?= =?utf-8?q?nULKHbfNbUIF+jTUZEH/LXgeAwebffKTgE74JLFBtZnPXTB3NhAy+gRPkVBYZnx8x?= =?utf-8?q?NMrbt2bP66I3DuYJ3qOSAZp3odvDlheJJ7xkZKSs9vLji1GevDiKoqt4Jkc0mnX0Q?= =?utf-8?q?Y0vNsBq8VYxhr23VdqABYicRRPOKspF+NvzbvXsDOhT6lNvEegotPnmNYFnxZufhb?= =?utf-8?q?rwCb4MbGQy2d23adjU6MYjQGUIaaEQ5zbt0HBmXts8wAz3pnR4k06HEfpnHTTYXfn?= =?utf-8?q?E7bSbtJquHtdGlU12/hIpX3AoDeKULmvAg=3D=3D?= X-Forefront-Antispam-Report: CIP:216.228.118.233;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge2.nvidia.com;CAT:NONE;SFS:(13230037)(1800799021)(376011)(7416011)(36860700010)(82310400023);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Jun 2024 15:09:29.7489 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: bbeef19e-ced2-490c-0601-08dc8edf7c84 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.233];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF00002310.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR12MB4464 The vdpa device can be reset many times in sequence without any significant state changes in between. Previously this was not a problem: VQs were torn down only on first reset. But after VQ pre-creation was introduced, each reset will delete and re-create the hardware VQs and their associated resources. To solve this problem, avoid resetting hardware VQs if the VQs are still in a blank state. Signed-off-by: Dragos Tatulea Reviewed-by: Cosmin Ratiu Acked-by: Eugenio Pérez --- drivers/vdpa/mlx5/net/mlx5_vnet.c | 30 +++++++++++++++++++++++++++--- 1 file changed, 27 insertions(+), 3 deletions(-) diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c index d80d6b47da61..1a5ee0d2b47f 100644 --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c @@ -3134,18 +3134,41 @@ static void init_group_to_asid_map(struct mlx5_vdpa_dev *mvdev) mvdev->group2asid[i] = 0; } +static bool needs_vqs_reset(const struct mlx5_vdpa_dev *mvdev) +{ + struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev); + struct mlx5_vdpa_virtqueue *mvq = &ndev->vqs[0]; + + if (mvdev->status & VIRTIO_CONFIG_S_DRIVER_OK) + return true; + + if (mvq->fw_state != MLX5_VIRTIO_NET_Q_OBJECT_STATE_INIT) + return true; + + return mvq->modified_fields & ( + MLX5_VIRTQ_MODIFY_MASK_STATE | + MLX5_VIRTQ_MODIFY_MASK_VIRTIO_Q_ADDRS | + MLX5_VIRTQ_MODIFY_MASK_VIRTIO_Q_AVAIL_IDX | + MLX5_VIRTQ_MODIFY_MASK_VIRTIO_Q_USED_IDX + ); +} + static int mlx5_vdpa_compat_reset(struct vdpa_device *vdev, u32 flags) { struct mlx5_vdpa_dev *mvdev = to_mvdev(vdev); struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev); + bool vq_reset; print_status(mvdev, 0, true); mlx5_vdpa_info(mvdev, "performing device reset\n"); down_write(&ndev->reslock); unregister_link_notifier(ndev); - teardown_vq_resources(ndev); - init_mvqs(ndev); + vq_reset = needs_vqs_reset(mvdev); + if (vq_reset) { + teardown_vq_resources(ndev); + init_mvqs(ndev); + } if (flags & VDPA_RESET_F_CLEAN_MAP) mlx5_vdpa_destroy_mr_resources(&ndev->mvdev); @@ -3165,7 +3188,8 @@ static int mlx5_vdpa_compat_reset(struct vdpa_device *vdev, u32 flags) if (mlx5_vdpa_create_dma_mr(mvdev)) mlx5_vdpa_warn(mvdev, "create MR failed\n"); } - setup_vq_resources(ndev, false); + if (vq_reset) + setup_vq_resources(ndev, false); up_write(&ndev->reslock); return 0;