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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250702172433.1738947-5-dtatulea@nvidia.com>
Date: Wed, 2 Jul 2025 20:24:26 +0300
From: Dragos Tatulea <dtatulea@...dia.com>
To: <almasrymina@...gle.com>, <asml.silence@...il.com>, Saeed Mahameed
	<saeedm@...dia.com>, Tariq Toukan <tariqt@...dia.com>, Leon Romanovsky
	<leon@...nel.org>, Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller"
	<davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
CC: Dragos Tatulea <dtatulea@...dia.com>, <cratiu@...dia.com>,
	<netdev@...r.kernel.org>, <linux-rdma@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: [RFC net-next 4/4] net/mlx5e: Enable HDS zerocopy flows for SFs

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@...dia.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