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io_uring/zcrx: add support for custom DMA devices

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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 <[email protected]>
Reviewed-by: Mina Almasry <[email protected]>
Reviewed-by: Pavel Begunkov <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>
This commit is contained in:
Dragos Tatulea authored and Jakub Kicinski committed 2025-08-28 16:05:31 -07:00
1 parent 13d8e05adf
commit 59b8b32ac8
1 file changed
+2 -1
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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;