// SPDX-License-Identifier: GPL-2.0-or-later #include <net/netdev_queues.h> /** * netdev_queue_get_dma_dev() - get dma device for zero-copy operations * @dev:	net_device * @idx:	queue index * * Get dma device for zero-copy operations to be used for this queue. * 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;	struct device *dma_dev; 	if (queue_ops && queue_ops->ndo_queue_get_dma_dev)		dma_dev = queue_ops->ndo_queue_get_dma_dev(dev, idx);	else		dma_dev = dev->dev.parent; 	return dma_dev && dma_dev->dma_mask ? dma_dev : NULL;}