linux-kernel - Re: [PATCH v2 1/2] vdpa/mlx5: Set speed and duplex of vDPA devices to UNKNOWN

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Message-ID: <3e9a6d05-a76c-4bbf-9f4e-2e126259b70e@amd.com>
Date: Tue, 3 Sep 2024 10:37:25 -0700
From: "Nelson, Shannon" <shannon.nelson@....com>
To: Carlos Bilbao <carlos.bilbao.osdev@...il.com>, dtatulea@...dia.com,
 mst@...hat.com, jasowang@...hat.com, sashal@...nel.org,
 alvaro.karsz@...id-run.com, christophe.jaillet@...adoo.fr,
 steven.sistare@...cle.com
Cc: 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 v2 1/2] vdpa/mlx5: Set speed and duplex of vDPA devices to
 UNKNOWN

On 9/3/2024 10:15 AM, Carlos Bilbao 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 devicess 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>
> ---
>   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..5fce6d62af4f 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);

I hate picking at little things like this, but this should be a tab 
rather than 4 spaces.

sln


> +}
> +
>   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
>