[PATCH net-next v4 2/7] io_uring/zcrx: add support for custom DMA devices
From: Dragos Tatulea <dtatulea@nvidia.com>
Date: 2025-08-20 17:13:38
Also in:
io-uring, lkml
Subsystem:
io_uring, io_uring zcrx, the rest · Maintainers:
Jens Axboe, Pavel Begunkov, Linus Torvalds
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 <redacted> Reviewed-by: Pavel Begunkov <asml.silence@gmail.com> --- io_uring/zcrx.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/io_uring/zcrx.c b/io_uring/zcrx.c
index e5ff49f3425e..319eddfd30e0 100644
--- a/io_uring/zcrx.c
+++ b/io_uring/zcrx.c@@ -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;
--
2.50.1