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Commit 506753b0 authored by Tariq Toukan's avatar Tariq Toukan Committed by David S. Miller
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net/mlx5e: Optimization for MTU change 



Avoid unnecessary interface down/up operations upon an MTU change
when it does not affect the rings configuration.

Fixes: 461017cb ("net/mlx5e: Support RX multi-packet WQE (Striding RQ)")
Signed-off-by: default avatarTariq Toukan <tariqt@mellanox.com>
Signed-off-by: default avatarSaeed Mahameed <saeedm@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 13f9bba7

drivers/net/ethernet/mellanox/mlx5/core/en_main.c

+7 −2
Original line number Diff line number Diff line
@@ -2569,6 +2569,7 @@ static int mlx5e_change_mtu(struct net_device *netdev, int new_mtu) 
	u16 max_mtu;

	u16 min_mtu;

	int err = 0;

	bool reset;



	mlx5_query_port_max_mtu(mdev, &max_mtu, 1);
@@ -2584,14 +2585,18 @@ static int mlx5e_change_mtu(struct net_device *netdev, int new_mtu) 


	mutex_lock(&priv->state_lock);



	reset = !priv->params.lro_en &&

		(priv->params.rq_wq_type !=

		 MLX5_WQ_TYPE_LINKED_LIST_STRIDING_RQ);



	was_opened = test_bit(MLX5E_STATE_OPENED, &priv->state);

	if (was_opened)

	if (was_opened && reset)

		mlx5e_close_locked(netdev);



	netdev->mtu = new_mtu;

	mlx5e_set_dev_port_mtu(netdev);



	if (was_opened)

	if (was_opened && reset)

		err = mlx5e_open_locked(netdev);



	mutex_unlock(&priv->state_lock);