linux-kernel - Re: [PATCH v3 1/2] vdpa/mlx5: Set speed and duplex of vDPA devices to UNKNOWN

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Message-ID: <CACGkMEvj0yWoGP6LvdNL5rkE59DsdpGwwaZNGVVHYO+zgjTudg@mail.gmail.com>
Date: Thu, 5 Sep 2024 10:26:22 +0800
From: Jason Wang <jasowang@...hat.com>
To: Carlos Bilbao <carlos.bilbao.osdev@...il.com>
Cc: dtatulea@...dia.com, mst@...hat.com, shannon.nelson@....com, 
	sashal@...nel.org, alvaro.karsz@...id-run.com, christophe.jaillet@...adoo.fr, 
	steven.sistare@...cle.com, bilbao@...edu, xuanzhuo@...ux.alibaba.com, 
	johnah.palmer@...cle.com, eperezma@...hat.com, cratiu@...dia.com, 
	virtualization@...ts.linux.dev, linux-kernel@...r.kernel.org, 
	Carlos Bilbao <cbilbao@...italocean.com>
Subject: Re: [PATCH v3 1/2] vdpa/mlx5: Set speed and duplex of vDPA devices to UNKNOWN

On Wed, Sep 4, 2024 at 11:18 PM Carlos Bilbao
<carlos.bilbao.osdev@...il.com> wrote:
>
> From: Carlos Bilbao <cbilbao@...italocean.com>
>
> Initialize the speed and duplex fields in virtio_net_config to UNKNOWN.
> This is needed because mlx5_vdpa vDPA devices currently do not support the
> VIRTIO_NET_F_SPEED_DUPLEX feature which reports speed and duplex. Add
> needed helper cpu_to_mlx5vdpa32() to convert endianness of speed.
>
> Signed-off-by: Carlos Bilbao <cbilbao@...italocean.com>
> Reviewed-by: Dragos Tatulea <dtatulea@...dia.com>

Acked-by: Jason Wang <jasowang@...hat.com>

Thanks

> ---
>  drivers/vdpa/mlx5/net/mlx5_vnet.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
>
> diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> index b56aae3f7be3..41ca268d43ff 100644
> --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> @@ -173,6 +173,11 @@ static __virtio16 cpu_to_mlx5vdpa16(struct mlx5_vdpa_dev *mvdev, u16 val)
>         return __cpu_to_virtio16(mlx5_vdpa_is_little_endian(mvdev), val);
>  }
>
> +static __virtio32 cpu_to_mlx5vdpa32(struct mlx5_vdpa_dev *mvdev, u32 val)
> +{
> +       return __cpu_to_virtio32(mlx5_vdpa_is_little_endian(mvdev), val);
> +}
> +
>  static u16 ctrl_vq_idx(struct mlx5_vdpa_dev *mvdev)
>  {
>         if (!(mvdev->actual_features & BIT_ULL(VIRTIO_NET_F_MQ)))
> @@ -3433,6 +3438,13 @@ static int mlx5_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name,
>         init_rwsem(&ndev->reslock);
>         config = &ndev->config;
>
> +       /*
> +        * mlx5_vdpa vDPA devices currently don't support reporting or
> +        * setting the speed or duplex.
> +        */
> +       config->speed  = cpu_to_mlx5vdpa32(mvdev, SPEED_UNKNOWN);
> +       config->duplex = DUPLEX_UNKNOWN;
> +
>         if (add_config->mask & BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MTU)) {
>                 err = config_func_mtu(mdev, add_config->net.mtu);
>                 if (err)
> --
> 2.34.1
>