netdev_queues.c

 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