On Wed, Sep 04, 2024 at 10:11:14AM -0500, Carlos Bilbao wrote:
> From: Carlos Bilbao <cbilbao@xxxxxxxxxxxxxxxx>
>
> 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.
I see no logic here. Without this feature bit, guests will not read
this field, why do we suddenly need to initialize it?
> Add
> needed helper cpu_to_mlx5vdpa32() to convert endianness of speed.
>
> Signed-off-by: Carlos Bilbao <cbilbao@xxxxxxxxxxxxxxxx>
> Reviewed-by: Dragos Tatulea <dtatulea@xxxxxxxxxx>
> ---
> 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
