1// SPDX-License-Identifier: GPL-2.0-or-later
2
3#include <net/netdev_queues.h>
4
5/**
6 * netdev_queue_get_dma_dev() - get dma device for zero-copy operations
7 * @dev: net_device
8 * @idx: queue index
9 *
10 * Get dma device for zero-copy operations to be used for this queue.
11 * When such device is not available or valid, the function will return NULL.
12 *
13 * Return: Device or NULL on error
14 */
15struct device *netdev_queue_get_dma_dev(struct net_device *dev, int idx)
16{
17 const struct netdev_queue_mgmt_ops *queue_ops = dev->queue_mgmt_ops;
18 struct device *dma_dev;
19
20 if (queue_ops && queue_ops->ndo_queue_get_dma_dev)
21 dma_dev = queue_ops->ndo_queue_get_dma_dev(dev, idx);
22 else
23 dma_dev = dev->dev.parent;
24
25 return dma_dev && dma_dev->dma_mask ? dma_dev : NULL;
26}
27
28