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net/mlx4_en: Fix race when setting the device MAC address 

Remove unnecessary use of workqueue for the device MAC address setting
flow, and fix a race when setting MAC address which was introduced by
commit c07cb4b0a "net/mlx4_en: Manage hash of MAC addresses per port"

The race happened when mlx4_en_replace_mac was being executed in parallel
with a successive call to ndo_set_mac_address, e.g witn an A/B/A MAC
setting configuration test, the third set fails.

With this change we also properly report an error if set MAC fails.

Signed-off-by: Yan Burman <yanb@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yan Burman 2013-03-07 03:46:55 +00:00 committed by David S. Miller
parent e7dbeba856
commit bfa8ab4741
2 changed files with 21 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
drivers/net/ethernet/mellanox/mlx4/en_netdev.c
View File

@ -650,28 +650,10 @@ u64 mlx4_en_mac_to_u64(u8 *addr)
return mac;
}
static int mlx4_en_set_mac(struct net_device *dev, void *addr)
static int mlx4_en_do_set_mac(struct mlx4_en_priv *priv)
{
struct mlx4_en_priv *priv = netdev_priv(dev);
struct mlx4_en_dev *mdev = priv->mdev;
struct sockaddr *saddr = addr;
if (!is_valid_ether_addr(saddr->sa_data))
return -EADDRNOTAVAIL;
memcpy(dev->dev_addr, saddr->sa_data, ETH_ALEN);
queue_work(mdev->workqueue, &priv->mac_task);
return 0;
}
static void mlx4_en_do_set_mac(struct work_struct *work)
{
struct mlx4_en_priv *priv = container_of(work, struct mlx4_en_priv,
mac_task);
struct mlx4_en_dev *mdev = priv->mdev;
int err = 0;
mutex_lock(&mdev->state_lock);
if (priv->port_up) {
/* Remove old MAC and insert the new one */
err = mlx4_en_replace_mac(priv, priv->base_qpn,
@ -683,7 +665,26 @@ static void mlx4_en_do_set_mac(struct work_struct *work)
} else
en_dbg(HW, priv, "Port is down while registering mac, exiting...\n");
return err;
}
static int mlx4_en_set_mac(struct net_device *dev, void *addr)
{
struct mlx4_en_priv *priv = netdev_priv(dev);
struct mlx4_en_dev *mdev = priv->mdev;
struct sockaddr *saddr = addr;
int err;
if (!is_valid_ether_addr(saddr->sa_data))
return -EADDRNOTAVAIL;
memcpy(dev->dev_addr, saddr->sa_data, ETH_ALEN);
mutex_lock(&mdev->state_lock);
err = mlx4_en_do_set_mac(priv);
mutex_unlock(&mdev->state_lock);
return err;
}
static void mlx4_en_clear_list(struct net_device *dev)
@ -1348,7 +1349,7 @@ static void mlx4_en_do_get_stats(struct work_struct *work)
queue_delayed_work(mdev->workqueue, &priv->stats_task, STATS_DELAY);
}
if (mdev->mac_removed[MLX4_MAX_PORTS + 1 - priv->port]) {
queue_work(mdev->workqueue, &priv->mac_task);
mlx4_en_do_set_mac(priv);
mdev->mac_removed[MLX4_MAX_PORTS + 1 - priv->port] = 0;
}
mutex_unlock(&mdev->state_lock);
@ -2078,7 +2079,6 @@ int mlx4_en_init_netdev(struct mlx4_en_dev *mdev, int port,
priv->msg_enable = MLX4_EN_MSG_LEVEL;
spin_lock_init(&priv->stats_lock);
INIT_WORK(&priv->rx_mode_task, mlx4_en_do_set_rx_mode);
INIT_WORK(&priv->mac_task, mlx4_en_do_set_mac);
INIT_WORK(&priv->watchdog_task, mlx4_en_restart);
INIT_WORK(&priv->linkstate_task, mlx4_en_linkstate);
INIT_DELAYED_WORK(&priv->stats_task, mlx4_en_do_get_stats);

1
drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
View File

@ -509,7 +509,6 @@ struct mlx4_en_priv {
struct mlx4_en_cq rx_cq[MAX_RX_RINGS];
struct mlx4_qp drop_qp;
struct work_struct rx_mode_task;
struct work_struct mac_task;
struct work_struct watchdog_task;
struct work_struct linkstate_task;
struct delayed_work stats_task;