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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: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit 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?B?NUNWNkl0bDdvQ3V2RWpBWEdoUkw1ajZqc3BDSmJPT1ZpejVpYUR4ZUdqNTQr?= =?utf-8?B?Q1orWnFPYS9JYWdRZThJNDVQb0VpQTJLd21nbTFXbGQ1MkI4NTF5VFYrRnV1?= =?utf-8?B?dlE1bEVrNHNMeUVFcFZ3V1c5Ull3MkRIbUQrZ1Z2QWprVklUaGdMNUU3di82?= =?utf-8?B?WWtkZlhaV0xnTGJKWVN0Q1AzSmZHSVprNDVjVHh2OURseTNVU2piQzh4dldv?= =?utf-8?B?cktUdUxPcEdIOU9YaGxOM3l3TWFWbWVRNWtTZkxxbUN4VTN6Z0IxTS8rNHc4?= =?utf-8?B?a3pVKzFGa0RiZ3U0TU52U0VWRzViV0QyQTVSV1ZoYkswa3pPOWk5STlSVjB1?= =?utf-8?B?UHZzMUJEME1nTmRkSFlITDZIeHdVMlBQak1wUHhUVWQ0eGN0MlRHZG9Ud09r?= =?utf-8?B?eFJ4UEJzaVFidmJTMThlU3YvRkh4UnRDZFczWFZqWHJ2ZlRaTHRmZTYzSnBN?= =?utf-8?B?V1Q0c05velRTbmhtdWVBSjN2YlkremppRklvaGNhZmJQVUdma1BFZVdCRCt3?= =?utf-8?B?NzJNUnZVZm5NTzBMN2x0TUlTMHlPZGdkY3IyOVpGQTdCRlcrSjM0dlIvaVhi?= =?utf-8?B?akdCa3YyMERzakZSeHBHZUthajlKbDJXMDgwUjFBaDZRaFU4V01BSnBPY0ZK?= =?utf-8?B?RjFQYlJwWW52M0ZTZzQ2TVBSOGw0akJCS3Nzd2tPZ2ErV2kyYi84Q09ka2N1?= =?utf-8?B?VFMxY1paNFZOTGRGZHFOQTlKNHdzdEI2K1NvNUxXM3JoWTVrbndlME9vUWZn?= =?utf-8?B?TGpPZVplN0hwVDFHY0YvcTlYVUp4WkpQNjlWcXdWNFJHUUVWRlFTcDdvODc2?= =?utf-8?B?RGEzbWRvRURFd1BLUnlLT1BYams2UzY5SEpwaGlsWGczWWlHWEdGM2NaZVZH?= =?utf-8?B?REFhNEE0N3hYTmUyUjgwU0lQQk9JMkNoc3h4U3VQTVdyZlg0bDArM0J0OUJH?= =?utf-8?B?MVh1WllFU3V1aTFsUXhTREtjRWVyNWFoRHpDd0RLVXZ1WTFGS1JZaEtjY29k?= =?utf-8?B?MnFvTkh4Q2ZOOUdNK25xQ3Ftc2UvbmdpSEtzckg2NGI2eEoxS1haZ0JBVGo4?= =?utf-8?B?S2Y0MGJpdzVKZkRLWWlMQU5CV21OaTZpMnRGSlVZK0t4ZEFjRXNKRFJYekl5?= =?utf-8?B?YTZlL2Fub011SEh2M2p5NWJpYWtiZXdKOE1IWWYydE95WmRuQTBzSEdkYlRH?= =?utf-8?B?VU1YNWpEaVpSZ1AxRmJnZVpMMXdkSW1WOHFPanVjKzAyK1NsRFdrdVNQZUZP?= =?utf-8?B?VDdxZWd5T2Znc0oyeGpEQmtDdU83OVdkL0Z5eXo0NGZsaUhTUFh4RkNvV29p?= =?utf-8?B?aXFjT09qanA1WURxRTg0a3daSHV3S2dRQ2pTUUIvUFRaOENDeElMZ3p3cmp0?= =?utf-8?B?NzBrS053Q1V3cWdPRnlSTVY2aGY5NnFkeVZseFRMcm8wSzJYYm9oZTNqWWZW?= =?utf-8?B?bjZuYUhieS9nc3U0dDZYNUZsTkoyYWpMbW5yeVhYUUtZZzd0ZnNCbDkyR2ZN?= =?utf-8?B?QlRRblVjcExnWUtuVUxLSGJmTmJVSUYralRVWkVIL0xYZ2VBd2ViZmZLVGdF?= =?utf-8?B?NzRKTEZCdFpuUFhUQjNOaEF5K2dSUGtWQllabng4eE5NcmJ0MmJQNjZJM0R1?= =?utf-8?B?WUozcU9TQVpwM29kdkRsaGVKSjd4a1pLU3M5dkxqaTFHZXZEaUtvcXQ0Smtj?= =?utf-8?B?MG1uWDBRWTB2TnNCcThWWXhocjIzVmRxQUJZaWNSUlBPS3NwRitOdnpidlhz?= =?utf-8?B?RE9oVDZsTnZFZWdvdFBubU5ZRm54WnVmaGJyd0NiNE1iR1F5MmQyM2FkalU2?= =?utf-8?B?TVlqUUdVSWFhRVE1emJ0MEhCbVh0czh3QXozcG5SNGswNkhFZnBuSFRUWVhm?= =?utf-8?B?bkU3YlNidEpxdUh0ZEdsVTEyL2hJcFgzQW9EZUtVTG12QWc9PQ==?= 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 --- 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; -- 2.45.1