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Fri, 16 Aug 2024 02:02:41 -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 08/10] vdpa/mlx5: Keep notifiers during suspend but ignore Date: Fri, 16 Aug 2024 12:01:57 +0300 Message-ID: <20240816090159.1967650-9-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: CH3PEPF00000011:EE_|SN7PR12MB6888:EE_ X-MS-Office365-Filtering-Correlation-Id: 7978d7b4-8e93-49b7-4d7a-08dcbdd23942 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|36860700013|82310400026|1800799024; X-Microsoft-Antispam-Message-Info: =?utf-8?B?SDFrenZHUjJMbjY3TzNJS2FWdWZxeDcvbUFNQ3ZRd0R1RnFLdGh5c0pROHhl?= =?utf-8?B?Z1o0NStVMVZYMVdxNG9CdlFEa0tnNWtVTFd4UHFRNjVLU2tnR0VzYnlGbk9U?= =?utf-8?B?eGpWcGo4VDBzS2JRQnVNcTNtaGZXbGZXMjgzSndtci92TVdBNkJYNmFQODFK?= =?utf-8?B?aGJOeEY2L1gxOW4wTXhQNTlNalpiUnZUdmVaTTVDSEI5SGUvRkE1Yi9Vc29F?= =?utf-8?B?TW04dnFTN1AwQmo1SitxWVNzZ0xOT0syVTZBNFhSRUREa0FkaWw1TldLcTh2?= =?utf-8?B?UXk3ZmpTUXRNQUttV2kzbklnc1dIRDFYazYxbVFxVXVxTENoSjVxK2dBRE5I?= =?utf-8?B?MThZS1owTDVUTmg5eGUveTZ5Y2pPb1daMktLYS9waW5SNExoQzRISkdOaGhD?= =?utf-8?B?MzR4bDB0a1A3OEx2VVJBMENEOExVeU5rSFgyK2dYQVQvclFlbkFFTE9rZm1J?= =?utf-8?B?YkxwSnJJbFpHYVFYU3RyOExyYnFjOE1jNEVvNXRlL29aM3ZZUUZFK0UzTGFE?= =?utf-8?B?WW9WaVRnNW03Z1g4ZVdaZUpBa2YzcVk0b0ZIY0pqcVN6dXl3a00xMG95TXZZ?= =?utf-8?B?dEw1OFBFMTkwUklpOTQ2MW9xRzJka0xFMS9leXJ5bTFmVTBWT1oyMVhId2lM?= =?utf-8?B?SlcreU5iQXp1ZHJEMGdGdDdEZXV6TWVybTdUMGJET1daZjJ0NGlvZmxSL296?= =?utf-8?B?bUh0d2JvS2h0MFNTZjFNQmpQNUI0ZHJINmV5SjVNVmlabGxaTGFtTTUvbU1X?= =?utf-8?B?MUlTZnVnTVMwM2dkVUQxZXNpSjlVcm9wLzJXQXRjSDdlR1dkTWUzWjB1eEgx?= =?utf-8?B?SC9BTkRTVmwzbStoUU4rblgzN04xNkEyWFA3alIrb080T1E2ZmptYXlCR3ZI?= =?utf-8?B?Nk8xcEtUV0lmQzVpWDNucDBIc2N5RXdITjBGNnJEd0tMc0UxeVNQLzlkQ1lQ?= =?utf-8?B?YldjYm5DUUdFWVNaTmZoMHArM1JzcGxSYitlQXkvUTloSUQzMngvck9TWWZB?= =?utf-8?B?Wk8vaTFOdzJhQVU3UVRiVlBDeUtYWWJZdlVLZkdmUGZRY2NidkttWFNVc0pr?= =?utf-8?B?dE1NbysyRTVDU1kvUThCNjFuclpVUzhkcmxlWXM1dC91eFUwZHVnM1o0UGlh?= =?utf-8?B?TU1HZHJqeWFDTG9pOXZyUXBlU2dzOHhLcXo5a1hzSkJ2alRNYkc5WWFNZFlw?= =?utf-8?B?bGVWbExvNUFicFQ2V01PeE5XSDZxTUp0V3pnWDRWTW9Gc1lRbitmQm8xMFgx?= =?utf-8?B?ZTJSMU9mNlFtY3Y3QUgzaG9JdmFhc3Z2L2E4SlFKOURnckNPRitlRlZPVlVO?= =?utf-8?B?Z0hMTFl5TzFrMGVPWFJwQjkybTBoeGVlMzEvQ0dZZTJVdVN0WDN0SFBHNloz?= =?utf-8?B?aWxWeml2MFVYUGZwc3lvZkVPclY1dWx4NnJBVXJ4dFlRZzE0NmZQUnFYbU9u?= =?utf-8?B?YzBXVGpVK2RqYThEQWZPdlpMNnAzUmRVbUQ5S1dwekNIaVZYVG10Z2FOa2tZ?= =?utf-8?B?d0dTSXZWY1hXaGJoWDFWVWRpWXFyM2htNU9GcTUvMUFwdjU1M2l6dmtQVFQ0?= =?utf-8?B?WmhHUjBhNzJVTXczT3NodWlOTEg0emwyWUJINGpTNGlldG9Sa2g4YTNYemZw?= =?utf-8?B?aWdGV1NQaXp6dWJiaEJWcXBvb2JCd1RCTFdGbFMzL0ovdGhIbnhDMlI2Zjli?= =?utf-8?B?eWJJL2ZoNjZpdnc3Smk5UHRoY21VNlM5bFNoZHJjL1VsOTh3eDVBOE04YWhV?= =?utf-8?B?cjZEWDFDWktxaCttWFdsRTNGL2g0by9idU5Oa0cvdHlyRnNMeE9BL2JybVdo?= =?utf-8?B?alZ0ZFFUQ1A2Qnl0ZThGaXFROUZDejNmMEZUS1VEQ3RXc0NmcVpsZkcrcmtw?= =?utf-8?B?M01KY3h0WVpDRmZ4WC9UOVhnV3JZL3lMbklISWtYTkpIUW90ZzZKMWxtVEZP?= =?utf-8?Q?SB0IjY1YXVuqAQyUnSaUJzwOspTEzx0W?= X-Forefront-Antispam-Report: CIP:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230040)(376014)(36860700013)(82310400026)(1800799024);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Aug 2024 09:02:57.9164 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 7978d7b4-8e93-49b7-4d7a-08dcbdd23942 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CH3PEPF00000011.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR12MB6888 Unregistering notifiers is a costly operation. Instead of removing the notifiers during device suspend and adding them back at resume, simply ignore the call when the device is suspended. At resume time call queue_link_work() to make sure that the device state is propagated in case there were changes. 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 suspend time is reduced from ~13 ms to ~2.5 ms. Signed-off-by: Dragos Tatulea Reviewed-by: Tariq Toukan Acked-by: Eugenio P=C3=A9rez --- drivers/vdpa/mlx5/net/mlx5_vnet.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5= _vnet.c index 0773bec917be..65063c507130 100644 --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c @@ -2850,6 +2850,9 @@ static int event_handler(struct notifier_block *nb, u= nsigned long event, void *p struct mlx5_eqe *eqe =3D param; int ret =3D NOTIFY_DONE; =20 + if (ndev->mvdev.suspended) + return NOTIFY_DONE; + if (event =3D=3D MLX5_EVENT_TYPE_PORT_CHANGE) { switch (eqe->sub_type) { case MLX5_PORT_CHANGE_SUBTYPE_DOWN: @@ -3595,7 +3598,6 @@ static int mlx5_vdpa_suspend(struct vdpa_device *vdev) mlx5_vdpa_info(mvdev, "suspending device\n"); =20 down_write(&ndev->reslock); - unregister_link_notifier(ndev); err =3D suspend_vqs(ndev, 0, ndev->cur_num_vqs); mlx5_vdpa_cvq_suspend(mvdev); mvdev->suspended =3D true; @@ -3617,7 +3619,7 @@ static int mlx5_vdpa_resume(struct vdpa_device *vdev) down_write(&ndev->reslock); mvdev->suspended =3D false; err =3D resume_vqs(ndev, 0, ndev->cur_num_vqs); - register_link_notifier(ndev); + queue_link_work(ndev); up_write(&ndev->reslock); =20 return err; --=20 2.45.1