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Fri, 16 Aug 2024 02:02:37 -0700 From: Dragos Tatulea To: "Michael S . Tsirkin" , Jason Wang , Eugenio Perez Martin , CC: Dragos Tatulea , Si-Wei Liu , Saeed Mahameed , Leon Romanovsky , , , Gal Pressman , Parav Pandit , Xuan Zhuo , Tariq Toukan Subject: [PATCH vhost v2 07/10] vdpa/mlx5: Parallelize device resume Date: Fri, 16 Aug 2024 12:01:56 +0300 Message-ID: <20240816090159.1967650-8-dtatulea@nvidia.com> X-Mailer: git-send-email 2.45.1 In-Reply-To: <20240816090159.1967650-1-dtatulea@nvidia.com> References: <20240816090159.1967650-1-dtatulea@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN1PEPF0000468E:EE_|PH0PR12MB7983:EE_ X-MS-Office365-Filtering-Correlation-Id: eb613aad-8205-4caa-f76c-08dcbdd236e1 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|36860700013|82310400026; X-Microsoft-Antispam-Message-Info: =?utf-8?B?bVlNTFV5Zk8wOTJwRWJLN2hQaGNoM2ZQVGNJUm9FS0FSaVFaOE1jRmZFdUxs?= =?utf-8?B?dUhCLzdtc2Y1SGJ6bG0yZGNGanZqRlhmQ0tTaU14K0g5aGtYN2kzTTJpalRz?= =?utf-8?B?OGNLZzZ6dXRjVlowUjNNblhoVTZrelB4UGJycmxhaWRid2RjZ0FEMDRibU5o?= =?utf-8?B?RXF6NjFhMEZWcjhBY3crRHlXd21pOXhjVEdqQXlIdkhid3F6aktQVEZHZ2JO?= =?utf-8?B?bDBxZ2EvWmlndytPSUhFcDBoVTczY3NSTU1BTEQzZmowYkpwbWdyVEJVcklz?= =?utf-8?B?UWYzZDdhYWlpVmJvcXFtLy9iSEYzL3h5elcwc2M4RnBOaHNTSTdFVHk5eGRB?= =?utf-8?B?Y1laYk84N3REbmNJcnNPaHQvY0xhcFgzWTRmeWl0VDJwYWtPOGdFMkFDa0NX?= =?utf-8?B?aVBxQ1pGTFFBRzlwaWxjanpZdXBqQlFhNEFiOVlGTzdPckNjSzFkRW13RmlS?= =?utf-8?B?ZXNwdlRUcmFobHNzbzg3WStWMmwwRkVzWEVXZmZ2ckV1RWNQeENZZEs2YVpn?= =?utf-8?B?ODUyVVE5TVZtOCtINm11SVZhdjZmYUpCM09PWWlnajdVaDlENENreXB4UGtN?= =?utf-8?B?NDNmY3F6UDNkQmtwejQxUzNBMFJLcGdYUjh2SXQvd20xQjl2dDkvd21wTVZE?= =?utf-8?B?c1dnb3ozb0E0MU1BWWM4dG1WL1c4M0VtaFh1M3Y0OGlWeXc1VzhxeUlpdmwy?= =?utf-8?B?NEFKdjM1V3FUTGJyYXhScmF0R1ZhNFE0TXJGMFMzQVZoVGVBVE5RYlg5L3ZL?= =?utf-8?B?ZGZxV2V4Y2NHUUN6dVNxN05KWk5HZVN6QzZLUCs5L2FuRStEbWcweHBwQ2lT?= =?utf-8?B?WkJyQ2xLTlB6YmdLeGNIajdLcVhRSGkvVWtMQ3dpTWZhcVNsdEpyS1U0d1lK?= =?utf-8?B?b1d3Q2FYRmlnK29aNUhpek1BSDhjeUdkTkFIUmZzd3hKclZCZzlQaGR6T25l?= =?utf-8?B?dCtrS1FCRisvMGxEeUdnM1AwWnJZUWZHUStZVDdlYVliWUVkYzg3VjNKRFpm?= =?utf-8?B?cnY4Ukd0YUdzYkxhNDlXR3VMVit1OHlHV1J0VUpXTWxFbnlneE13NG5SclRC?= =?utf-8?B?VmxLNWtITnlWaXFFMGVpVXBZTllIWExxZlp3cGswOEdLWUVnNUNoaEcwNWtD?= =?utf-8?B?NHJVOU5TbEppL3FsVW5IaDJaNGVzdWhTeVBGVVJBNzhuQ2N3dWJFanYwL3Q5?= =?utf-8?B?SHV6THpUbHV5WTRhODB2TUljSzR0eFZEWDI1ellHTmFYVXFOR1VpNTlxMG5v?= =?utf-8?B?L2VPSVR4dEhiVWRZZjhocW8zUEJCKzQzTHJzVDVneS9Zc0pFeXVER3BhUWdl?= =?utf-8?B?TU1yRWEzbHJ3Yy9mazdBSGwxVWhuY2wvOG85S2ZxbXFVRTJoS1JNRDhSYXNF?= =?utf-8?B?M21YY1owVUw3SjRkcnF2S0pRZDdJZGpvb3dlWGJKci9SNGlZa0VpVFc1blJT?= =?utf-8?B?N3BLUS9wbm9LL0V5UmJNUk1zSkczNVFKMEYrZU15WnpPNVBSejAwdlFEUldk?= =?utf-8?B?cUdSUW1IZDVNODR6WitWeW4zVTJtQkdjVXdvYXErTmxSL2xDbXZMOFhrY0hj?= =?utf-8?B?eUtPMXdvbUdBSkNiVXlrYUIvbE44TUk4K1lINW15QWJ2WDBLSW5FT1FCSzVQ?= =?utf-8?B?ZWNYc2FnQXhJQ3I5UWF1T3RaOE5hTlQwRkExZFZUa2NvSU9JWnF4dDJycGhF?= =?utf-8?B?M2tIMkgxeFp1eWl1TEZ6aEorTXViS08zbDljQnVjZ1h3cGhqMzlOdWNCU0FF?= =?utf-8?B?azlheVlqTzNjUGVRUlZCa25kaEdqejdBQzcwS2ZDQWY0NWxLeC9Dem9YKzRB?= =?utf-8?B?eVlTMzVWQmRINjFvTXVOdnFEUnluUktWOU9rd0U5bW1TWTBYQlBETzc0cUJF?= =?utf-8?B?cGJIUU5zaTNzZUFLSVRNQU9XczhVUDB2QTR2L2hvWStMTWNLSHV0RDgrTjdN?= =?utf-8?Q?EeXI+GLhdIVdCVc+VdPg2qBviExwEXcW?= X-Forefront-Antispam-Report: CIP:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230040)(1800799024)(376014)(36860700013)(82310400026);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Aug 2024 09:02:53.8828 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: eb613aad-8205-4caa-f76c-08dcbdd236e1 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN1PEPF0000468E.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR12MB7983 Currently device resume works on vqs serially. Building up on previous changes that converted vq operations to the async api, this patch parallelizes the device resume. For 1 vDPA device x 32 VQs (16 VQPs) attached to a large VM (256 GB RAM, 32 CPUs x 2 threads per core), the device resume time is reduced from ~16 ms to ~4.5 ms. Signed-off-by: Dragos Tatulea Reviewed-by: Tariq Toukan Acked-by: Eugenio P=C3=A9rez --- drivers/vdpa/mlx5/net/mlx5_vnet.c | 40 +++++++++++-------------------- 1 file changed, 14 insertions(+), 26 deletions(-) diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5= _vnet.c index 5fba16c80dbb..0773bec917be 100644 --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c @@ -1675,10 +1675,15 @@ static int suspend_vq(struct mlx5_vdpa_net *ndev, s= truct mlx5_vdpa_virtqueue *mv return suspend_vqs(ndev, mvq->index, 1); } =20 -static int resume_vq(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtqueu= e *mvq) +static int resume_vqs(struct mlx5_vdpa_net *ndev, int start_vq, int num_vq= s) { + struct mlx5_vdpa_virtqueue *mvq; int err; =20 + if (start_vq >=3D ndev->mvdev.max_vqs) + return -EINVAL; + + mvq =3D &ndev->vqs[start_vq]; if (!mvq->initialized) return 0; =20 @@ -1690,13 +1695,9 @@ static int resume_vq(struct mlx5_vdpa_net *ndev, str= uct mlx5_vdpa_virtqueue *mvq /* Due to a FW quirk we need to modify the VQ fields first then change s= tate. * This should be fixed soon. After that, a single command can be used. */ - err =3D modify_virtqueues(ndev, mvq->index, 1, mvq->fw_state); - if (err) { - mlx5_vdpa_err(&ndev->mvdev, - "modify vq properties failed for vq %u, err: %d\n", - mvq->index, err); + err =3D modify_virtqueues(ndev, start_vq, num_vqs, mvq->fw_state); + if (err) return err; - } break; case MLX5_VIRTIO_NET_Q_OBJECT_STATE_SUSPEND: if (!is_resumable(ndev)) { @@ -1712,25 +1713,12 @@ static int resume_vq(struct mlx5_vdpa_net *ndev, st= ruct mlx5_vdpa_virtqueue *mvq return -EINVAL; } =20 - err =3D modify_virtqueues(ndev, mvq->index, 1, MLX5_VIRTIO_NET_Q_OBJECT_S= TATE_RDY); - if (err) - mlx5_vdpa_err(&ndev->mvdev, "modify to resume failed for vq %u, err: %d\= n", - mvq->index, err); - - return err; + return modify_virtqueues(ndev, start_vq, num_vqs, MLX5_VIRTIO_NET_Q_OBJEC= T_STATE_RDY); } =20 -static int resume_vqs(struct mlx5_vdpa_net *ndev) +static int resume_vq(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtqueu= e *mvq) { - int err =3D 0; - - for (int i =3D 0; i < ndev->cur_num_vqs; i++) { - int local_err =3D resume_vq(ndev, &ndev->vqs[i]); - - err =3D local_err ? local_err : err; - } - - return err; + return resume_vqs(ndev, mvq->index, 1); } =20 static void teardown_vq(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtq= ueue *mvq) @@ -3080,7 +3068,7 @@ static int mlx5_vdpa_change_map(struct mlx5_vdpa_dev = *mvdev, return err; } =20 - resume_vqs(ndev); + resume_vqs(ndev, 0, ndev->cur_num_vqs); =20 return 0; } @@ -3204,7 +3192,7 @@ static void mlx5_vdpa_set_status(struct vdpa_device *= vdev, u8 status) teardown_vq_resources(ndev); =20 if (ndev->setup) { - err =3D resume_vqs(ndev); + err =3D resume_vqs(ndev, 0, ndev->cur_num_vqs); if (err) { mlx5_vdpa_warn(mvdev, "failed to resume VQs\n"); goto err_driver; @@ -3628,7 +3616,7 @@ static int mlx5_vdpa_resume(struct vdpa_device *vdev) =20 down_write(&ndev->reslock); mvdev->suspended =3D false; - err =3D resume_vqs(ndev); + err =3D resume_vqs(ndev, 0, ndev->cur_num_vqs); register_link_notifier(ndev); up_write(&ndev->reslock); =20 --=20 2.45.1