linux-kernel - Re: [PATCH] vdpa: Set speed and duplex of mlx5

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Message-ID: <8a8d3c23-5e91-4456-99c2-6e91548abe42@nvidia.com>
Date: Thu, 29 Aug 2024 12:20:18 +0200
From: Dragos Tatulea <dtatulea@...dia.com>
To: Carlos Bilbao <carlos.bilbao.osdev@...il.com>, mst@...hat.com,
 jasowang@...hat.com
Cc: bilbao@...edu, xuanzhuo@...ux.alibaba.com, eperezma@...hat.com,
 cratiu@...dia.com, lingshan.zhu@...el.com, virtualization@...ts.linux.dev,
 linux-kernel@...r.kernel.org, Carlos Bilbao <cbilbao@...italocean.com>
Subject: Re: [PATCH] vdpa: Set speed and duplex of mlx5_vnet to UNKNOWN



On 28.08.24 20:16, Carlos Bilbao wrote:
> From: Carlos Bilbao <cbilbao@...italocean.com>
> 
> mlx5_vdpa vDPA devices currently don't support reporting or setting the
> speed and duplex and hence should be UNKNOWN instead of zero.
> 
> Signed-off-by: Carlos Bilbao <cbilbao@...italocean.com>
> ---
>  drivers/vdpa/mlx5/net/mlx5_vnet.c |  7 +++++++
>  drivers/vdpa/vdpa.c               | 23 +++++++++++++++++++++++
>  include/uapi/linux/vdpa.h         |  2 ++
>  3 files changed, 32 insertions(+)
> 
> diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> index fa78e8288ebb..319f5c6121de 100644
> --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> @@ -3795,6 +3795,13 @@ 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  = SPEED_UNKNOWN;
> +	config->duplex = DUPLEX_UNKNOWN;
> +
The values in virtio_net_config are little endian so you'll need to explicitly
convert them. As speed is a u32, you'll need to add a cpu_to_mlx5vdpa32() helper.

Thanks,
Dragos

>  	if (add_config->mask & BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MTU)) {
>  		err = config_func_mtu(mdev, add_config->net.mtu);
>  		if (err)
> diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
> index 4dbd2e55a288..abde23e0041d 100644
> --- a/drivers/vdpa/vdpa.c
> +++ b/drivers/vdpa/vdpa.c
> @@ -15,6 +15,7 @@
>  #include <net/genetlink.h>
>  #include <linux/mod_devicetable.h>
>  #include <linux/virtio_ids.h>
> +#include <uapi/linux/ethtool.h>
>  
>  static LIST_HEAD(mdev_head);
>  /* A global mutex that protects vdpa management device and device level operations. */
> @@ -919,6 +920,22 @@ static int vdpa_dev_net_status_config_fill(struct sk_buff *msg, u64 features,
>  	return nla_put_u16(msg, VDPA_ATTR_DEV_NET_STATUS, val_u16);
>  }
>  
> +static int vdpa_dev_net_speed_config_fill(struct sk_buff *msg, u64 features,
> +					struct virtio_net_config *config)
> +{
> +	__le32 speed = cpu_to_le32(SPEED_UNKNOWN);
> +
> +	return nla_put(msg, VDPA_ATTR_DEV_NET_CFG_SPEED, sizeof(speed), &speed);
> +}
> +
> +static int vdpa_dev_net_duplex_config_fill(struct sk_buff *msg, u64 features,
> +					struct virtio_net_config *config)
> +{
> +	u8 duplex = DUPLEX_UNKNOWN;
> +
> +	return nla_put(msg, VDPA_ATTR_DEV_NET_CFG_DUPLEX, sizeof(duplex), &duplex);
> +}
> +
>  static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *msg)
>  {
>  	struct virtio_net_config config = {};
> @@ -941,6 +958,12 @@ static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *ms
>  	if (vdpa_dev_net_status_config_fill(msg, features_device, &config))
>  		return -EMSGSIZE;
>  
> +	if (vdpa_dev_net_speed_config_fill(msg, features_device, &config))
> +		return -EMSGSIZE;
> +
> +	if (vdpa_dev_net_duplex_config_fill(msg, features_device, &config))
> +		return -EMSGSIZE;
> +
>  	return vdpa_dev_net_mq_config_fill(msg, features_device, &config);
>  }
>  
> diff --git a/include/uapi/linux/vdpa.h b/include/uapi/linux/vdpa.h
> index 842bf1201ac4..1c64ee0dd7b1 100644
> --- a/include/uapi/linux/vdpa.h
> +++ b/include/uapi/linux/vdpa.h
> @@ -43,6 +43,8 @@ enum vdpa_attr {
>  	VDPA_ATTR_DEV_NET_STATUS,		/* u8 */
>  	VDPA_ATTR_DEV_NET_CFG_MAX_VQP,		/* u16 */
>  	VDPA_ATTR_DEV_NET_CFG_MTU,		/* u16 */
> +	VDPA_ATTR_DEV_NET_CFG_SPEED,		/* u32 */
> +	VDPA_ATTR_DEV_NET_CFG_DUPLEX,		/* u8 */
>  
>  	VDPA_ATTR_DEV_NEGOTIATED_FEATURES,	/* u64 */
>  	VDPA_ATTR_DEV_MGMTDEV_MAX_VQS,		/* u32 */