[RFC net-next 4/4] net/mlx5e: Enable HDS zerocopy flows for SFs
From: Dragos Tatulea <dtatulea@nvidia.com>
Date: 2025-07-02 17:27:20
Also in:
linux-rdma, lkml
Subsystem:
mellanox ethernet driver (mlx5e), mellanox mlx5 core vpi driver, networking drivers, the rest · Maintainers:
Saeed Mahameed, Tariq Toukan, Mark Bloch, Leon Romanovsky, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
An SF has an auxiliary device as a parent. This type of device can't be used for zerocopy DMA mapping operations. A PCI device is required. Use the new netdev dma_dev functionality to expose the actual PCI device to be used for DMA. Always set it to keep things generic. Signed-off-by: Dragos Tatulea <dtatulea@nvidia.com> --- drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index e8e5b347f9b2..c4e45205fba4 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c@@ -5841,6 +5841,9 @@ static int mlx5e_nic_init(struct mlx5_core_dev *mdev, /* update XDP supported features */ mlx5e_set_xdp_feature(netdev); + /* Set pci device for dma. Useful for SFs. */ + netdev->dma_dev = &mdev->pdev->dev; + if (take_rtnl) rtnl_unlock();
--
2.50.0