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Tsirkin" , Jason Wang , Eugenio Perez Martin , Si-Wei Liu , Saeed Mahameed , Leon Romanovsky , , Gal Pressman CC: Dragos Tatulea , , , Parav Pandit , Xuan Zhuo Subject: [PATCH vhost v3 3/6] vdpa/mlx5: Introduce per vq and device resume Date: Fri, 15 Dec 2023 16:01:43 +0200 Message-ID: <20231215140146.95816-4-dtatulea@nvidia.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231215140146.95816-1-dtatulea@nvidia.com> References: <20231215140146.95816-1-dtatulea@nvidia.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1PEPF000044FC:EE_|IA0PR12MB7601:EE_ X-MS-Office365-Filtering-Correlation-Id: 170d9b8c-2690-40fc-e621-08dbfd76749c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 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:(13230031)(4636009)(396003)(136003)(376002)(39860400002)(346002)(230922051799003)(451199024)(64100799003)(1800799012)(186009)(82310400011)(40470700004)(46966006)(36840700001)(47076005)(8676002)(8936002)(4326008)(83380400001)(40460700003)(54906003)(6636002)(316002)(36756003)(356005)(7636003)(41300700001)(82740400003)(2906002)(86362001)(26005)(5660300002)(70206006)(40480700001)(1076003)(2616005)(478600001)(36860700001)(6666004)(336012)(426003)(66574015)(110136005)(70586007);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Dec 2023 14:02:20.6527 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 170d9b8c-2690-40fc-e621-08dbfd76749c 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: CO1PEPF000044FC.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA0PR12MB7601 Implement vdpa vq and device resume if capability detected. Add support for suspend -> ready state change. Reviewed-by: Gal Pressman Acked-by: Eugenio Pérez Signed-off-by: Dragos Tatulea --- drivers/vdpa/mlx5/net/mlx5_vnet.c | 69 +++++++++++++++++++++++++++---- 1 file changed, 62 insertions(+), 7 deletions(-) diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c index 1e08a8805640..f8f088cced50 100644 --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c @@ -1170,7 +1170,12 @@ static int query_virtqueue(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtqueu return err; } -static bool is_valid_state_change(int oldstate, int newstate) +static bool is_resumable(struct mlx5_vdpa_net *ndev) +{ + return ndev->mvdev.vdev.config->resume; +} + +static bool is_valid_state_change(int oldstate, int newstate, bool resumable) { switch (oldstate) { case MLX5_VIRTIO_NET_Q_OBJECT_STATE_INIT: @@ -1178,6 +1183,7 @@ static bool is_valid_state_change(int oldstate, int newstate) case MLX5_VIRTIO_NET_Q_OBJECT_STATE_RDY: return newstate == MLX5_VIRTIO_NET_Q_OBJECT_STATE_SUSPEND; case MLX5_VIRTIO_NET_Q_OBJECT_STATE_SUSPEND: + return resumable ? newstate == MLX5_VIRTIO_NET_Q_OBJECT_STATE_RDY : false; case MLX5_VIRTIO_NET_Q_OBJECT_STATE_ERR: default: return false; @@ -1200,6 +1206,7 @@ static int modify_virtqueue(struct mlx5_vdpa_net *ndev, { int inlen = MLX5_ST_SZ_BYTES(modify_virtio_net_q_in); u32 out[MLX5_ST_SZ_DW(modify_virtio_net_q_out)] = {}; + bool state_change = false; void *obj_context; void *cmd_hdr; void *in; @@ -1211,9 +1218,6 @@ static int modify_virtqueue(struct mlx5_vdpa_net *ndev, if (!modifiable_virtqueue_fields(mvq)) return -EINVAL; - if (!is_valid_state_change(mvq->fw_state, state)) - return -EINVAL; - in = kzalloc(inlen, GFP_KERNEL); if (!in) return -ENOMEM; @@ -1226,17 +1230,29 @@ static int modify_virtqueue(struct mlx5_vdpa_net *ndev, MLX5_SET(general_obj_in_cmd_hdr, cmd_hdr, uid, ndev->mvdev.res.uid); obj_context = MLX5_ADDR_OF(modify_virtio_net_q_in, in, obj_context); - if (mvq->modified_fields & MLX5_VIRTQ_MODIFY_MASK_STATE) + + if (mvq->modified_fields & MLX5_VIRTQ_MODIFY_MASK_STATE) { + if (!is_valid_state_change(mvq->fw_state, state, is_resumable(ndev))) { + err = -EINVAL; + goto done; + } + MLX5_SET(virtio_net_q_object, obj_context, state, state); + state_change = true; + } MLX5_SET64(virtio_net_q_object, obj_context, modify_field_select, mvq->modified_fields); err = mlx5_cmd_exec(ndev->mvdev.mdev, in, inlen, out, sizeof(out)); - kfree(in); - if (!err) + if (err) + goto done; + + if (state_change) mvq->fw_state = state; mvq->modified_fields = 0; +done: + kfree(in); return err; } @@ -1430,6 +1446,24 @@ static void suspend_vqs(struct mlx5_vdpa_net *ndev) suspend_vq(ndev, &ndev->vqs[i]); } +static void resume_vq(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtqueue *mvq) +{ + if (!mvq->initialized || !is_resumable(ndev)) + return; + + if (mvq->fw_state != MLX5_VIRTIO_NET_Q_OBJECT_STATE_SUSPEND) + return; + + if (modify_virtqueue_state(ndev, mvq, MLX5_VIRTIO_NET_Q_OBJECT_STATE_RDY)) + mlx5_vdpa_warn(&ndev->mvdev, "modify to resume failed for vq %u\n", mvq->index); +} + +static void resume_vqs(struct mlx5_vdpa_net *ndev) +{ + for (int i = 0; i < ndev->mvdev.max_vqs; i++) + resume_vq(ndev, &ndev->vqs[i]); +} + static void teardown_vq(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtqueue *mvq) { if (!mvq->initialized) @@ -3261,6 +3295,23 @@ static int mlx5_vdpa_suspend(struct vdpa_device *vdev) return 0; } +static int mlx5_vdpa_resume(struct vdpa_device *vdev) +{ + struct mlx5_vdpa_dev *mvdev = to_mvdev(vdev); + struct mlx5_vdpa_net *ndev; + + ndev = to_mlx5_vdpa_ndev(mvdev); + + mlx5_vdpa_info(mvdev, "resuming device\n"); + + down_write(&ndev->reslock); + mvdev->suspended = false; + resume_vqs(ndev); + register_link_notifier(ndev); + up_write(&ndev->reslock); + return 0; +} + static int mlx5_set_group_asid(struct vdpa_device *vdev, u32 group, unsigned int asid) { @@ -3317,6 +3368,7 @@ static const struct vdpa_config_ops mlx5_vdpa_ops = { .get_vq_dma_dev = mlx5_get_vq_dma_dev, .free = mlx5_vdpa_free, .suspend = mlx5_vdpa_suspend, + .resume = mlx5_vdpa_resume, /* Op disabled if not supported. */ }; static int query_mtu(struct mlx5_core_dev *mdev, u16 *mtu) @@ -3688,6 +3740,9 @@ static int mlx5v_probe(struct auxiliary_device *adev, if (!MLX5_CAP_DEV_VDPA_EMULATION(mdev, desc_group_mkey_supported)) mgtdev->vdpa_ops.get_vq_desc_group = NULL; + if (!MLX5_CAP_DEV_VDPA_EMULATION(mdev, freeze_to_rdy_supported)) + mgtdev->vdpa_ops.resume = NULL; + err = vdpa_mgmtdev_register(&mgtdev->mgtdev); if (err) goto reg_err;