netdev - [PATCH net-next V2 04/14] net/mlx5e: SHAMPO, Fix FCS config when HW GRO on

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Date: Tue, 4 Jun 2024 00:22:09 +0300
From: Tariq Toukan <tariqt@...dia.com>
To: "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>
CC: <netdev@...r.kernel.org>, Saeed Mahameed <saeedm@...dia.com>, Gal Pressman
	<gal@...dia.com>, Leon Romanovsky <leonro@...dia.com>, Dragos Tatulea
	<dtatulea@...dia.com>, Tariq Toukan <tariqt@...dia.com>
Subject: [PATCH net-next V2 04/14] net/mlx5e: SHAMPO, Fix FCS config when HW GRO on

From: Dragos Tatulea <dtatulea@...dia.com>

For the following scenario:

ethtool --features eth3 rx-gro-hw on
ethtool --features eth3 rx-fcs on
ethtool --features eth3 rx-fcs off

... there is a firmware error because the driver enables HW GRO first
while FCS is still enabled.

This patch fixes this by swapping the order of HW GRO and FCS for this
specific case. Take LRO into consideration as well for consistency.

Signed-off-by: Dragos Tatulea <dtatulea@...dia.com>
Signed-off-by: Tariq Toukan <tariqt@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index c53c99dde558..d0808dbe69d3 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -4259,13 +4259,19 @@ int mlx5e_set_features(struct net_device *netdev, netdev_features_t features)
 #define MLX5E_HANDLE_FEATURE(feature, handler) \
 	mlx5e_handle_feature(netdev, &oper_features, feature, handler)
 
-	err |= MLX5E_HANDLE_FEATURE(NETIF_F_LRO, set_feature_lro);
-	err |= MLX5E_HANDLE_FEATURE(NETIF_F_GRO_HW, set_feature_hw_gro);
+	if (features & (NETIF_F_GRO_HW | NETIF_F_LRO)) {
+		err |= MLX5E_HANDLE_FEATURE(NETIF_F_RXFCS, set_feature_rx_fcs);
+		err |= MLX5E_HANDLE_FEATURE(NETIF_F_LRO, set_feature_lro);
+		err |= MLX5E_HANDLE_FEATURE(NETIF_F_GRO_HW, set_feature_hw_gro);
+	} else {
+		err |= MLX5E_HANDLE_FEATURE(NETIF_F_LRO, set_feature_lro);
+		err |= MLX5E_HANDLE_FEATURE(NETIF_F_GRO_HW, set_feature_hw_gro);
+		err |= MLX5E_HANDLE_FEATURE(NETIF_F_RXFCS, set_feature_rx_fcs);
+	}
 	err |= MLX5E_HANDLE_FEATURE(NETIF_F_HW_VLAN_CTAG_FILTER,
 				    set_feature_cvlan_filter);
 	err |= MLX5E_HANDLE_FEATURE(NETIF_F_HW_TC, set_feature_hw_tc);
 	err |= MLX5E_HANDLE_FEATURE(NETIF_F_RXALL, set_feature_rx_all);
-	err |= MLX5E_HANDLE_FEATURE(NETIF_F_RXFCS, set_feature_rx_fcs);
 	err |= MLX5E_HANDLE_FEATURE(NETIF_F_HW_VLAN_CTAG_RX, set_feature_rx_vlan);
 #ifdef CONFIG_MLX5_EN_ARFS
 	err |= MLX5E_HANDLE_FEATURE(NETIF_F_NTUPLE, set_feature_arfs);
-- 
2.44.0