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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: Dragos Tatulea <dtatulea@nvidia.com>
Reviewed-by: Mina Almasry <almasrymina@google.com>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://patch.msgid.link/20250827144017.1529208-4-dtatulea@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Dragos Tatulea 2025-08-27 17:39:56 +03:00 committed by Jakub Kicinski
parent 13d8e05adf
commit 59b8b32ac8
1 changed files with 2 additions and 1 deletions
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3
io_uring/zcrx.c
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@ -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;