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SubjectRe: [PATCH v2] vdpa/mlx5: Enable user to add/delete vdpa device
On Thu, Feb 18, 2021 at 09:41:57AM +0200, Eli Cohen wrote:
> 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>

Not sure which tree this is for, I could not apply this.

> ---
> 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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