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Message-Id: <1471543751-24164-3-git-send-email-saeedm@mellanox.com>
Date: Thu, 18 Aug 2016 21:09:03 +0300
From: Saeed Mahameed <saeedm@...lanox.com>
To: "David S. Miller" <davem@...emloft.net>
Cc: netdev@...r.kernel.org, Or Gerlitz <ogerlitz@...lanox.com>,
Tariq Toukan <tariqt@...lanox.com>,
Saeed Mahameed <saeedm@...lanox.com>
Subject: [PATCH net 02/10] net/mlx5e: Optimization for MTU change
From: Tariq Toukan <tariqt@...lanox.com>
Avoid unnecessary interface down/up operations upon an MTU change
when it does not affect the rings configuration.
Fixes: 461017cb006a ("net/mlx5e: Support RX multi-packet WQE (Striding RQ)")
Signed-off-by: Tariq Toukan <tariqt@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
---
drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 0fc3a2b..65258b2 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -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);
--
2.7.4
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