[RFC net-next 4/4] net/mlx5e: Enable HDS zerocopy flows for SFs

[Dragos Tatulea <dtatulea@nvidia.com>]

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