superrob1500
/
mirror-linux
mirror of https://github.com/torvalds/linux
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

net: Proxy netdev_queue_get_dma_dev for leased queues 

Extend netdev_queue_get_dma_dev to return the physical device of the
real rxq for DMA in case the queue was leased. This allows memory
providers like io_uring zero-copy or devmem to bind to the physically
leased rxq via virtual devices such as netkit.

Signed-off-by: David Wei <dw@davidwei.uk>
Co-developed-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org>
Link: https://patch.msgid.link/20260115082603.219152-7-daniel@iogearbox.net
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
master
David Wei 2026-01-15 09:25:53 +01:00 committed by Paolo Abeni
parent 0caa9a8dde
commit 804bf334d0
1 changed files with 15 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
net/core/netdev_queues.c
View File

@ -9,16 +9,29 @@
* @dev: net_device
* @idx: queue index
*
* 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;
if (queue_ops && queue_ops->ndo_queue_get_dma_dev)
dma_dev = queue_ops->ndo_queue_get_dma_dev(dev, idx);
else