linux-kernel - Re: [PATCH v2 2/4] vdpa: pass initial config to _vdpa_register

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Message-ID: <CACGkMEuT7O1xLrB9=eYHAtuHYdwbNXxqtC+Mh4qkWSkLM+QTjg@mail.gmail.com>
Date:   Thu, 20 Oct 2022 13:20:57 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Si-Wei Liu <si-wei.liu@...cle.com>
Cc:     mst@...hat.com, virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/4] vdpa: pass initial config to _vdpa_register_device()

On Wed, Oct 19, 2022 at 8:56 AM Si-Wei Liu <si-wei.liu@...cle.com> wrote:
>
> Just as _vdpa_register_device taking @nvqs as the number of queues

I wonder if it's better to embed nvqs in the config structure.

> to feed userspace inquery via vdpa_dev_fill(), we can follow the
> same to stash config attributes in struct vdpa_device at the time
> of vdpa registration.
>
> Signed-off-by: Si-Wei Liu <si-wei.liu@...cle.com>
> ---
>  drivers/vdpa/ifcvf/ifcvf_main.c      |  2 +-
>  drivers/vdpa/mlx5/net/mlx5_vnet.c    |  2 +-
>  drivers/vdpa/vdpa.c                  | 15 +++++++++++----
>  drivers/vdpa/vdpa_sim/vdpa_sim_blk.c |  2 +-
>  drivers/vdpa/vdpa_sim/vdpa_sim_net.c |  2 +-
>  drivers/vdpa/vdpa_user/vduse_dev.c   |  2 +-
>  drivers/vdpa/virtio_pci/vp_vdpa.c    |  3 ++-
>  include/linux/vdpa.h                 |  3 ++-
>  8 files changed, 20 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c b/drivers/vdpa/ifcvf/ifcvf_main.c
> index f9c0044..c54ab2c 100644
> --- a/drivers/vdpa/ifcvf/ifcvf_main.c
> +++ b/drivers/vdpa/ifcvf/ifcvf_main.c
> @@ -771,7 +771,7 @@ static int ifcvf_vdpa_dev_add(struct vdpa_mgmt_dev *mdev, const char *name,
>         else
>                 ret = dev_set_name(&vdpa_dev->dev, "vdpa%u", vdpa_dev->index);
>
> -       ret = _vdpa_register_device(&adapter->vdpa, vf->nr_vring);
> +       ret = _vdpa_register_device(&adapter->vdpa, vf->nr_vring, config);
>         if (ret) {
>                 put_device(&adapter->vdpa.dev);
>                 IFCVF_ERR(pdev, "Failed to register to vDPA bus");
> diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> index 9091336..376082e 100644
> --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> @@ -3206,7 +3206,7 @@ static int mlx5_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name,
>         mlx5_notifier_register(mdev, &ndev->nb);
>         ndev->nb_registered = true;
>         mvdev->vdev.mdev = &mgtdev->mgtdev;
> -       err = _vdpa_register_device(&mvdev->vdev, max_vqs + 1);
> +       err = _vdpa_register_device(&mvdev->vdev, max_vqs + 1, add_config);
>         if (err)
>                 goto err_reg;
>
> diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
> index febdc99..566c1c6 100644
> --- a/drivers/vdpa/vdpa.c
> +++ b/drivers/vdpa/vdpa.c
> @@ -215,11 +215,16 @@ static int vdpa_name_match(struct device *dev, const void *data)
>         return (strcmp(dev_name(&vdev->dev), data) == 0);
>  }
>
> -static int __vdpa_register_device(struct vdpa_device *vdev, u32 nvqs)
> +static int __vdpa_register_device(struct vdpa_device *vdev, u32 nvqs,
> +                                 const struct vdpa_dev_set_config *cfg)
>  {
>         struct device *dev;
>
>         vdev->nvqs = nvqs;
> +       if (cfg)
> +               vdev->vdev_cfg = *cfg;
> +       else
> +               vdev->vdev_cfg.mask = 0ULL;

I think it would be nice if we can convert eni to use netlink then we
don't need any workaround like this.

Thanks