[PATCH 4.17 10/31] net/mlx5e: IPoIB, Set the netdevice sw mtu in ipoib enhanced flow

[Greg Kroah-Hartman]

4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Feras Daoud <ferasda@xxxxxxxxxxxx>

[ Upstream commit 8e1d162d8e81838119de18b4ca1e302ce906f2a6 ]

After introduction of the cited commit, mlx5e_build_nic_params
receives the netdevice mtu in order to set the sw_mtu of mlx5e_params.
For enhanced IPoIB, the netdevice mtu is not set in this stage,
therefore, the initial sw_mtu equals zero. As a result, the hw_mtu
of the receive queue will be calculated incorrectly causing traffic
issues.

To fix this issue, query for port mtu before building the nic params.

Fixes: 472a1e44b349 ("net/mlx5e: Save MTU in channels params")
Signed-off-by: Feras Daoud <ferasda@xxxxxxxxxxxx>
Reviewed-by: Tariq Toukan <tariqt@xxxxxxxxxxxx>
Signed-off-by: Saeed Mahameed <saeedm@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/net/ethernet/mellanox/mlx5/core/ipoib/ipoib.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/net/ethernet/mellanox/mlx5/core/ipoib/ipoib.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/ipoib/ipoib.c
@@ -76,6 +76,7 @@ void mlx5i_init(struct mlx5_core_dev *md
 		void *ppriv)
 {
 	struct mlx5e_priv *priv  = mlx5i_epriv(netdev);
+	u16 max_mtu;
 
 	/* priv init */
 	priv->mdev        = mdev;
@@ -84,6 +85,9 @@ void mlx5i_init(struct mlx5_core_dev *md
 	priv->ppriv       = ppriv;
 	mutex_init(&priv->state_lock);
 
+	mlx5_query_port_max_mtu(mdev, &max_mtu, 1);
+	netdev->mtu = max_mtu;
+
 	mlx5e_build_nic_params(mdev, &priv->channels.params,
 			       profile->max_nch(mdev), netdev->mtu);
 	mlx5i_build_nic_params(mdev, &priv->channels.params);