Commit 59b8b32a authored by Dragos Tatulea's avatar Dragos Tatulea Committed by Jakub Kicinski
Browse files

io_uring/zcrx: add support for custom DMA devices 



Use the new API for getting a DMA device for a specific netdev queue.

This patch will allow io_uring zero-copy rx to work with devices
where the DMA device is not stored in the parent device. mlx5 SFs
are an example of such a device.

Signed-off-by: default avatarDragos Tatulea <dtatulea@nvidia.com>
Reviewed-by: default avatarMina Almasry <almasrymina@google.com>
Reviewed-by: default avatarPavel Begunkov <asml.silence@gmail.com>
Link: https://patch.msgid.link/20250827144017.1529208-4-dtatulea@nvidia.com


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 13d8e05a

io_uring/zcrx.c

+2 −1
Original line number Diff line number Diff line
@@ -12,6 +12,7 @@ 
#include <net/page_pool/helpers.h>

#include <net/page_pool/memory_provider.h>

#include <net/netlink.h>

#include <net/netdev_queues.h>

#include <net/netdev_rx_queue.h>

#include <net/tcp.h>

#include <net/rps.h>
@@ -599,7 +600,7 @@ int io_register_zcrx_ifq(struct io_ring_ctx *ctx, 
		goto err;

	}



	ifq->dev = ifq->netdev->dev.parent;

	ifq->dev = netdev_queue_get_dma_dev(ifq->netdev, ifq->if_rxq);

	if (!ifq->dev) {

		ret = -EOPNOTSUPP;

		goto err;