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net/mlx4_en: Fix transmit timeout when driver restarts port 

Under heavy CPU load, changing, ring size/mtu/etc. could result in transmit
timeout, since stop-start port might take more than 10 seconds.
Calling netif_detach_device to prevent tx queue transmit timeout.

netif_detach_device() is not called under ndo_stop, because netif_carrier_off
will prevent the timeout, and device should not be marked as not present, or
else user won't be able to start it later on.

CC: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Eugenia Emantayev <eugenia@mellanox.com>
Signed-off-by: Amir Vadai <amirv@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Amir Vadai 2013-01-30 23:07:11 +00:00 committed by David S. Miller
parent 955154fa33
commit 3484aac161
3 changed files with 14 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
View File

@ -496,7 +496,7 @@ static int mlx4_en_set_ringparam(struct net_device *dev,
mutex_lock(&mdev->state_lock);
if (priv->port_up) {
port_up = 1;
mlx4_en_stop_port(dev);
mlx4_en_stop_port(dev, 1);
}
mlx4_en_free_resources(priv);
@ -591,7 +591,7 @@ static int mlx4_en_set_rxfh_indir(struct net_device *dev,
mutex_lock(&mdev->state_lock);
if (priv->port_up) {
port_up = 1;
mlx4_en_stop_port(dev);
mlx4_en_stop_port(dev, 1);
}
priv->prof->rss_rings = rss_rings;
@ -1096,7 +1096,7 @@ static int mlx4_en_set_channels(struct net_device *dev,
mutex_lock(&mdev->state_lock);
if (priv->port_up) {
port_up = 1;
mlx4_en_stop_port(dev);
mlx4_en_stop_port(dev, 1);
}
mlx4_en_free_resources(priv);

14
drivers/net/ethernet/mellanox/mlx4/en_netdev.c
View File

@ -1178,6 +1178,8 @@ int mlx4_en_start_port(struct net_device *dev)
priv->port_up = true;
netif_tx_start_all_queues(dev);
netif_device_attach(dev);
return 0;
tx_err:
@ -1200,7 +1202,7 @@ cq_err:
}
void mlx4_en_stop_port(struct net_device *dev)
void mlx4_en_stop_port(struct net_device *dev, int detach)
{
struct mlx4_en_priv *priv = netdev_priv(dev);
struct mlx4_en_dev *mdev = priv->mdev;
@ -1216,9 +1218,13 @@ void mlx4_en_stop_port(struct net_device *dev)
/* Synchronize with tx routine */
netif_tx_lock_bh(dev);
if (detach)
netif_device_detach(dev);
netif_tx_stop_all_queues(dev);
netif_tx_unlock_bh(dev);
netif_tx_disable(dev);
/* Set port as not active */
priv->port_up = false;
@ -1323,7 +1329,7 @@ static void mlx4_en_restart(struct work_struct *work)
mutex_lock(&mdev->state_lock);
if (priv->port_up) {
mlx4_en_stop_port(dev);
mlx4_en_stop_port(dev, 1);
for (i = 0; i < priv->tx_ring_num; i++)
netdev_tx_reset_queue(priv->tx_ring[i].tx_queue);
if (mlx4_en_start_port(dev))
@ -1395,7 +1401,7 @@ static int mlx4_en_close(struct net_device *dev)
mutex_lock(&mdev->state_lock);
mlx4_en_stop_port(dev);
mlx4_en_stop_port(dev, 0);
netif_carrier_off(dev);
mutex_unlock(&mdev->state_lock);
@ -1533,7 +1539,7 @@ static int mlx4_en_change_mtu(struct net_device *dev, int new_mtu)
* the port */
en_dbg(DRV, priv, "Change MTU called with card down!?\n");
} else {
mlx4_en_stop_port(dev);
mlx4_en_stop_port(dev, 1);
err = mlx4_en_start_port(dev);
if (err) {
en_err(priv, "Failed restarting port:%d\n",

2
drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
View File

@ -539,7 +539,7 @@ int mlx4_en_init_netdev(struct mlx4_en_dev *mdev, int port,
struct mlx4_en_port_profile *prof);
int mlx4_en_start_port(struct net_device *dev);
void mlx4_en_stop_port(struct net_device *dev);
void mlx4_en_stop_port(struct net_device *dev, int detach);
void mlx4_en_free_resources(struct mlx4_en_priv *priv);
int mlx4_en_alloc_resources(struct mlx4_en_priv *priv);