Subject: Re: [PATCH net-next v8 07/16] net: Proxy netdev_queue_get_dma_dev for leased queues

From: Jakub Kicinski <[email-masked]>
Date: Sat, 31 Jan 2026 16:04:45 -0800

On Thu, 29 Jan 2026 23:28:21 +0100 Daniel Borkmann wrote:
> - * Get dma device for zero-copy operations to be used for this queue.
> + * Get dma device for zero-copy operations to be used for this queue. If the
> + * queue is leased to a physical queue, we retrieve the latter's dma device.
>   * When such device is not available or valid, the function will return NULL.
>   *
>   * Return: Device or NULL on error
>   */
>  struct device *netdev_queue_get_dma_dev(struct net_device *dev, int idx)
>  {
> -	const struct netdev_queue_mgmt_ops *queue_ops = dev->queue_mgmt_ops;
> +	const struct netdev_queue_mgmt_ops *queue_ops;
>  	struct device *dma_dev;
>  
> +	if (idx < dev->real_num_rx_queues) {
> +		struct netdev_rx_queue *rxq = __netif_get_rx_queue(dev, idx);
> +
> +		if (rxq->lease) {
> +			rxq = rxq->lease;
> +			dev = rxq->dev;
> +			idx = get_netdev_rx_queue_index(rxq);
> +		}
> +	}
> +
> +	queue_ops = dev->queue_mgmt_ops;

We're gonna call physical device's op without locking it no?