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Subject[PATCH v2] vdpa/mlx5: Enable user to add/delete vdpa device
Date
Allow to control vdpa device creation and destruction using the vdpa
management tool.

Examples:
1. List the management devices
$ vdpa mgmtdev show
pci/0000:3b:00.1:
supported_classes net

2. Create vdpa instance
$ vdpa dev add mgmtdev pci/0000:3b:00.1 name vdpa0

3. Show vdpa devices
$ vdpa dev show
vdpa0: type network mgmtdev pci/0000:3b:00.1 vendor_id 5555 max_vqs 16 \
max_vq_size 256

Signed-off-by: Eli Cohen <elic@nvidia.com>
Reviewed-by: Parav Pandit <parav@nvidia.com>
---
v0->v1:
set mgtdev->ndev NULL on dev delete
v1->v2: Resend

drivers/vdpa/mlx5/net/mlx5_vnet.c | 79 +++++++++++++++++++++++++++----
1 file changed, 70 insertions(+), 9 deletions(-)

diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
index a51b0f86afe2..08fb481ddc4f 100644
--- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
+++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
@@ -1974,23 +1974,32 @@ static void init_mvqs(struct mlx5_vdpa_net *ndev)
}
}

-static int mlx5v_probe(struct auxiliary_device *adev,
- const struct auxiliary_device_id *id)
+struct mlx5_vdpa_mgmtdev {
+ struct vdpa_mgmt_dev mgtdev;
+ struct mlx5_adev *madev;
+ struct mlx5_vdpa_net *ndev;
+};
+
+static int mlx5_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name)
{
- struct mlx5_adev *madev = container_of(adev, struct mlx5_adev, adev);
- struct mlx5_core_dev *mdev = madev->mdev;
+ struct mlx5_vdpa_mgmtdev *mgtdev = container_of(v_mdev, struct mlx5_vdpa_mgmtdev, mgtdev);
struct virtio_net_config *config;
struct mlx5_vdpa_dev *mvdev;
struct mlx5_vdpa_net *ndev;
+ struct mlx5_core_dev *mdev;
u32 max_vqs;
int err;

+ if (mgtdev->ndev)
+ return -ENOSPC;
+
+ mdev = mgtdev->madev->mdev;
/* we save one virtqueue for control virtqueue should we require it */
max_vqs = MLX5_CAP_DEV_VDPA_EMULATION(mdev, max_num_virtio_queues);
max_vqs = min_t(u32, max_vqs, MLX5_MAX_SUPPORTED_VQS);

ndev = vdpa_alloc_device(struct mlx5_vdpa_net, mvdev.vdev, mdev->device, &mlx5_vdpa_ops,
- 2 * mlx5_vdpa_max_qps(max_vqs), NULL);
+ 2 * mlx5_vdpa_max_qps(max_vqs), name);
if (IS_ERR(ndev))
return PTR_ERR(ndev);

@@ -2018,11 +2027,12 @@ static int mlx5v_probe(struct auxiliary_device *adev,
if (err)
goto err_res;

- err = vdpa_register_device(&mvdev->vdev);
+ mvdev->vdev.mdev = &mgtdev->mgtdev;
+ err = _vdpa_register_device(&mvdev->vdev);
if (err)
goto err_reg;

- dev_set_drvdata(&adev->dev, ndev);
+ mgtdev->ndev = ndev;
return 0;

err_reg:
@@ -2035,11 +2045,62 @@ static int mlx5v_probe(struct auxiliary_device *adev,
return err;
}

+static void mlx5_vdpa_dev_del(struct vdpa_mgmt_dev *v_mdev, struct vdpa_device *dev)
+{
+ struct mlx5_vdpa_mgmtdev *mgtdev = container_of(v_mdev, struct mlx5_vdpa_mgmtdev, mgtdev);
+
+ _vdpa_unregister_device(dev);
+ mgtdev->ndev = NULL;
+}
+
+static const struct vdpa_mgmtdev_ops mdev_ops = {
+ .dev_add = mlx5_vdpa_dev_add,
+ .dev_del = mlx5_vdpa_dev_del,
+};
+
+static struct virtio_device_id id_table[] = {
+ { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
+ { 0 },
+};
+
+static int mlx5v_probe(struct auxiliary_device *adev,
+ const struct auxiliary_device_id *id)
+
+{
+ struct mlx5_adev *madev = container_of(adev, struct mlx5_adev, adev);
+ struct mlx5_core_dev *mdev = madev->mdev;
+ struct mlx5_vdpa_mgmtdev *mgtdev;
+ int err;
+
+ mgtdev = kzalloc(sizeof(*mgtdev), GFP_KERNEL);
+ if (!mgtdev)
+ return -ENOMEM;
+
+ mgtdev->mgtdev.ops = &mdev_ops;
+ mgtdev->mgtdev.device = mdev->device;
+ mgtdev->mgtdev.id_table = id_table;
+ mgtdev->madev = madev;
+
+ err = vdpa_mgmtdev_register(&mgtdev->mgtdev);
+ if (err)
+ goto reg_err;
+
+ dev_set_drvdata(&adev->dev, mgtdev);
+
+ return 0;
+
+reg_err:
+ kfree(mdev);
+ return err;
+}
+
static void mlx5v_remove(struct auxiliary_device *adev)
{
- struct mlx5_vdpa_dev *mvdev = dev_get_drvdata(&adev->dev);
+ struct mlx5_vdpa_mgmtdev *mgtdev;

- vdpa_unregister_device(&mvdev->vdev);
+ mgtdev = dev_get_drvdata(&adev->dev);
+ vdpa_mgmtdev_unregister(&mgtdev->mgtdev);
+ kfree(mgtdev);
}

static const struct auxiliary_device_id mlx5v_id_table[] = {
--
2.29.2
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