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 */ 15 struct 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