# Re: \[PATCH net-next v8 07/16\] net: Proxy netdev\_queue\_get\_dma\_dev for leased queues

- From: Jakub Kicinski \<kuba@kernel.org\>
- Date: 2026-02-01 00:04:47 
- List: netdev
- Page: https://ratatoskr.run/netdev/2026/02/7942264
- Thread: https://ratatoskr.run/netdev/2026/01/7942161/t.md

```text
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?
```