Re: [PATCH v7 2/3] vdpa_sim_net: Add the support of set mac address

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> +static int vdpasim_net_set_attr(struct vdpa_mgmt_dev *mdev, struct vdpa_device *dev,
> +				const struct vdpa_dev_set_config *config)
> +{
> +	struct vdpasim *vdpasim = container_of(dev, struct vdpasim, vdpa);
> +	struct virtio_net_config *vio_config = vdpasim->config;
> +
> +	mutex_lock(&vdpasim->mutex);
> +
> +	if (config->mask & (1 << VDPA_ATTR_DEV_NET_CFG_MACADDR)) {
> +		ether_addr_copy(vio_config->mac, config->net.mac);
> +		mutex_unlock(&vdpasim->mutex);
> +		return 0;
> +	}
> +
> +	mutex_unlock(&vdpasim->mutex);
> +	return -EINVAL;

EOPNOTSUPP would be more appropriate.

	Andrew




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