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

- From: David Wei \<hidden\>
- Date: 2026-02-01 22:23:20 
- List: netdev
- Page: https://ratatoskr.run/netdev/2026/02/7942315
- Thread: https://ratatoskr.run/netdev/2026/01/7942161/t.md

```text
On 2026-02-01 09:04, Jakub Kicinski wrote:
> 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?

Yeah, sorry about that. I'll change this to be similar to the new
mp_open.
```