netdev - [PATCH net-next 1/2] net/mlx5e: Update features on MTU change

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Message-ID: <20241024164134.299646-2-tariqt@nvidia.com>
Date: Thu, 24 Oct 2024 19:41:32 +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>, "Andrew
 Lunn" <andrew+netdev@...n.ch>
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 1/2] net/mlx5e: Update features on MTU change

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

When the MTU changes successfully, trigger netdev_update_features() to
enable features in wanted state if applicable.

An example of such scenario:
$ ip link set dev eth1 up
$ ethtool --set-ring eth1 rx 8192
$ ip link set dev eth1 mtu 9000
$ ethtool --features eth1 rx-gro-hw on --> fails
$ ip link set dev eth1 mtu 7000

With this patch, HW GRO will be turned on automatically because
it is set in the device's wanted_features.

Signed-off-by: Dragos Tatulea <dtatulea@...dia.com>
Reviewed-by: Gal Pressman <gal@...dia.com>
Signed-off-by: Tariq Toukan <tariqt@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index ce94859014f8..235d00300626 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -4557,6 +4557,10 @@ int mlx5e_change_mtu(struct net_device *netdev, int new_mtu,
 out:
 	WRITE_ONCE(netdev->mtu, params->sw_mtu);
 	mutex_unlock(&priv->state_lock);
+
+	if (!err)
+		netdev_update_features(netdev);
+
 	return err;
 }
 
-- 
2.44.0