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Thu, 14 Jul 2022 04:38:14 -0700 Received: from vdi.nvidia.com (10.127.8.13) by mail.nvidia.com (10.126.190.181) with Microsoft SMTP Server id 15.2.986.26 via Frontend Transport; Thu, 14 Jul 2022 04:38:12 -0700 From: Eli Cohen To: , , , CC: , , , Eli Cohen Subject: [PATCH 1/2] vdpa/mlx5: Implement susupend virtqueue callback Date: Thu, 14 Jul 2022 14:38:06 +0300 Message-ID: <20220714113807.85665-2-elic@nvidia.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220714113807.85665-1-elic@nvidia.com> References: <20220714113807.85665-1-elic@nvidia.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: b4caf4c8-0af4-47c1-1390-08da658d59cd X-MS-TrafficTypeDiagnostic: DM5PR1201MB0155:EE_ 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:12.22.5.235;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:InfoNoRecords;CAT:NONE;SFS:(13230016)(4636009)(396003)(39860400002)(346002)(136003)(376002)(36840700001)(40470700004)(46966006)(336012)(82740400003)(8676002)(316002)(70586007)(107886003)(186003)(2616005)(26005)(7696005)(40460700003)(70206006)(8936002)(110136005)(478600001)(1076003)(5660300002)(81166007)(82310400005)(41300700001)(86362001)(6666004)(4326008)(54906003)(356005)(2906002)(47076005)(426003)(40480700001)(83380400001)(36860700001)(36756003)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Jul 2022 11:38:19.5878 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b4caf4c8-0af4-47c1-1390-08da658d59cd X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[12.22.5.235];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT014.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR1201MB0155 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Implement the suspend callback allowing to suspend the virtqueues so they stop processing descriptors. This is required to allow to query a consistent state of the virtqueue while live migration is taking place. Signed-off-by: Eli Cohen --- drivers/vdpa/mlx5/net/mlx5_vnet.c | 83 ++++++++++++++++++++++++++++-- include/linux/mlx5/mlx5_ifc_vdpa.h | 8 +++ 2 files changed, 88 insertions(+), 3 deletions(-) diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c index e85c1d71f4ed..d0fff559ca15 100644 --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c @@ -164,6 +164,7 @@ struct mlx5_vdpa_net { bool setup; u32 cur_num_vqs; u32 rqt_size; + bool nb_registered; struct notifier_block nb; struct vdpa_callback config_cb; struct mlx5_vdpa_wq_ent cvq_ent; @@ -895,6 +896,7 @@ static int create_virtqueue(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtque if (err) goto err_cmd; + mvq->fw_state = MLX5_VIRTIO_NET_Q_OBJECT_STATE_INIT; kfree(in); mvq->virtq_id = MLX5_GET(general_obj_out_cmd_hdr, out, obj_id); @@ -922,6 +924,7 @@ static void destroy_virtqueue(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtq mlx5_vdpa_warn(&ndev->mvdev, "destroy virtqueue 0x%x\n", mvq->virtq_id); return; } + mvq->fw_state = MLX5_VIRTIO_NET_Q_OBJECT_NONE; umems_destroy(ndev, mvq); } @@ -1121,6 +1124,20 @@ 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) +{ + switch (oldstate) { + case MLX5_VIRTIO_NET_Q_OBJECT_STATE_INIT: + return newstate == MLX5_VIRTIO_NET_Q_OBJECT_STATE_RDY; + 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: + case MLX5_VIRTIO_NET_Q_OBJECT_STATE_ERR: + default: + return false; + } +} + static int modify_virtqueue(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtqueue *mvq, int state) { int inlen = MLX5_ST_SZ_BYTES(modify_virtio_net_q_in); @@ -1130,6 +1147,12 @@ static int modify_virtqueue(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtque void *in; int err; + if (mvq->fw_state == MLX5_VIRTIO_NET_Q_OBJECT_NONE) + return 0; + + if (!is_valid_state_change(mvq->fw_state, state)) + return -EINVAL; + in = kzalloc(inlen, GFP_KERNEL); if (!in) return -ENOMEM; @@ -1992,6 +2015,7 @@ static void mlx5_vdpa_set_vq_ready(struct vdpa_device *vdev, u16 idx, bool ready struct mlx5_vdpa_dev *mvdev = to_mvdev(vdev); struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev); struct mlx5_vdpa_virtqueue *mvq; + int err; if (!mvdev->actual_features) return; @@ -2005,8 +2029,16 @@ static void mlx5_vdpa_set_vq_ready(struct vdpa_device *vdev, u16 idx, bool ready } mvq = &ndev->vqs[idx]; - if (!ready) + if (!ready) { suspend_vq(ndev, mvq); + } else { + err = modify_virtqueue(ndev, mvq, MLX5_VIRTIO_NET_Q_OBJECT_STATE_RDY); + if (err) { + mlx5_vdpa_warn(mvdev, "modify VQ %d to ready failed (%d)\n", idx, err); + ready = false; + } + } + mvq->ready = ready; } @@ -2733,6 +2765,37 @@ static int mlx5_vdpa_get_vendor_vq_stats(struct vdpa_device *vdev, u16 idx, return err; } +static void mlx5_vdpa_cvq_suspend(struct mlx5_vdpa_dev *mvdev) +{ + struct mlx5_control_vq *cvq; + + if (!(mvdev->actual_features & BIT_ULL(VIRTIO_NET_F_CTRL_VQ))) + return; + + cvq = &mvdev->cvq; + cvq->ready = false; +} + +static int mlx5_vdpa_suspend(struct vdpa_device *vdev) +{ + struct mlx5_vdpa_dev *mvdev = to_mvdev(vdev); + struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev); + struct mlx5_vdpa_virtqueue *mvq; + int i; + + down_write(&ndev->reslock); + mlx5_notifier_unregister(mvdev->mdev, &ndev->nb); + ndev->nb_registered = false; + flush_workqueue(ndev->mvdev.wq); + for (i = 0; i < ndev->cur_num_vqs; i++) { + mvq = &ndev->vqs[i]; + suspend_vq(ndev, mvq); + } + mlx5_vdpa_cvq_suspend(mvdev); + up_write(&ndev->reslock); + return 0; +} + static const struct vdpa_config_ops mlx5_vdpa_ops = { .set_vq_address = mlx5_vdpa_set_vq_address, .set_vq_num = mlx5_vdpa_set_vq_num, @@ -2763,6 +2826,7 @@ static const struct vdpa_config_ops mlx5_vdpa_ops = { .get_generation = mlx5_vdpa_get_generation, .set_map = mlx5_vdpa_set_map, .free = mlx5_vdpa_free, + .suspend = mlx5_vdpa_suspend, }; static int query_mtu(struct mlx5_core_dev *mdev, u16 *mtu) @@ -2828,6 +2892,7 @@ static void init_mvqs(struct mlx5_vdpa_net *ndev) mvq->index = i; mvq->ndev = ndev; mvq->fwqp.fw = true; + mvq->fw_state = MLX5_VIRTIO_NET_Q_OBJECT_NONE; } for (; i < ndev->mvdev.max_vqs; i++) { mvq = &ndev->vqs[i]; @@ -2902,13 +2967,21 @@ static int event_handler(struct notifier_block *nb, unsigned long event, void *p switch (eqe->sub_type) { case MLX5_PORT_CHANGE_SUBTYPE_DOWN: case MLX5_PORT_CHANGE_SUBTYPE_ACTIVE: + down_read(&ndev->reslock); + if (!ndev->nb_registered) { + up_read(&ndev->reslock); + return NOTIFY_DONE; + } wqent = kzalloc(sizeof(*wqent), GFP_ATOMIC); - if (!wqent) + if (!wqent) { + up_read(&ndev->reslock); return NOTIFY_DONE; + } wqent->mvdev = &ndev->mvdev; INIT_WORK(&wqent->work, update_carrier); queue_work(ndev->mvdev.wq, &wqent->work); + up_read(&ndev->reslock); ret = NOTIFY_OK; break; default: @@ -3062,6 +3135,7 @@ static int mlx5_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name, ndev->nb.notifier_call = event_handler; mlx5_notifier_register(mdev, &ndev->nb); + ndev->nb_registered = true; mvdev->vdev.mdev = &mgtdev->mgtdev; err = _vdpa_register_device(&mvdev->vdev, max_vqs + 1); if (err) @@ -3093,7 +3167,10 @@ static void mlx5_vdpa_dev_del(struct vdpa_mgmt_dev *v_mdev, struct vdpa_device * struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev); struct workqueue_struct *wq; - mlx5_notifier_unregister(mvdev->mdev, &ndev->nb); + if (ndev->nb_registered) { + mlx5_notifier_unregister(mvdev->mdev, &ndev->nb); + ndev->nb_registered = false; + } wq = mvdev->wq; mvdev->wq = NULL; destroy_workqueue(wq); diff --git a/include/linux/mlx5/mlx5_ifc_vdpa.h b/include/linux/mlx5/mlx5_ifc_vdpa.h index 4414ed5b6ed2..9becdc3fa503 100644 --- a/include/linux/mlx5/mlx5_ifc_vdpa.h +++ b/include/linux/mlx5/mlx5_ifc_vdpa.h @@ -150,6 +150,14 @@ enum { MLX5_VIRTIO_NET_Q_OBJECT_STATE_ERR = 0x3, }; +/* This indicates that the object was not created or has already + * been desroyed. It is very safe to assume that this object will never + * have so many states + */ +enum { + MLX5_VIRTIO_NET_Q_OBJECT_NONE = 0xffffffff +}; + enum { MLX5_RQTC_LIST_Q_TYPE_RQ = 0x0, MLX5_RQTC_LIST_Q_TYPE_VIRTIO_NET_Q = 0x1, -- 2.35.1