linux-kernel - [PATCH net-next 2/3] net/mlx5e: TSO for UDP over GRE over vlan packets

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Message-ID: <20260107091848.621884-3-mbloch@nvidia.com>
Date: Wed, 7 Jan 2026 11:18:47 +0200
From: Mark Bloch <mbloch@...dia.com>
To: Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew+netdev@...n.ch>, "David
 S. Miller" <davem@...emloft.net>
CC: Saeed Mahameed <saeedm@...dia.com>, Tariq Toukan <tariqt@...dia.com>,
	"Mark Bloch" <mbloch@...dia.com>, Leon Romanovsky <leon@...nel.org>,
	<netdev@...r.kernel.org>, <linux-rdma@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Gal Pressman <gal@...dia.com>, Cosmin Ratiu
	<cratiu@...dia.com>
Subject: [PATCH net-next 2/3] net/mlx5e: TSO for UDP over GRE over vlan packets

From: Gal Pressman <gal@...dia.com>

The hardware supports segmentation offload of UDP over GRE over vlan
packets, allow it by adding NETIF_F_GSO_UDP_L4 to hw_enc_features which
will make the vlan device inherit it to its own hw_enc_features.

Side note: it is quite confusing that this change wasn't needed to
offload encapsulated UDP packets regardless of vlan, but that's the way
that the stack handles gso partial features, it assumes they're
supported without caring if the feature is supported in hw_enc_features.

Signed-off-by: Gal Pressman <gal@...dia.com>
Reviewed-by: Cosmin Ratiu <cratiu@...dia.com>
Reviewed-by: Tariq Toukan <tariqt@...dia.com>
Signed-off-by: Mark Bloch <mbloch@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 1734c4dd1d0f..ce71a03a9b71 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -5814,6 +5814,7 @@ static void mlx5e_build_nic_netdev(struct net_device *netdev)
 
 	netdev->gso_partial_features             |= NETIF_F_GSO_UDP_L4;
 	netdev->hw_features                      |= NETIF_F_GSO_UDP_L4;
+	netdev->hw_enc_features                  |= NETIF_F_GSO_UDP_L4;
 
 	mlx5_query_port_fcs(mdev, &fcs_supported, &fcs_enabled);
 
-- 
2.34.1