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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: 461017cb00 ("net/mlx5e: Support RX multi-packet WQE (Striding RQ)")
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tariq Toukan 2016-08-18 21:09:03 +03:00 committed by David S. Miller
parent 13f9bba7cd
commit 506753b0b4
1 changed files with 7 additions and 2 deletions
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9
drivers/net/ethernet/mellanox/mlx5/core/en_main.c
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@ -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);