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Message-Id: <1399880605-28772-8-git-send-email-amirv@mellanox.com>
Date: Mon, 12 May 2014 10:43:23 +0300
From: Amir Vadai <amirv@...lanox.com>
To: "David S. Miller" <davem@...emloft.net>
Cc: netdev@...r.kernel.org, Amir Vadai <amirv@...lanox.com>,
Yevgeny Petrilin <yevgenyp@...lanox.com>,
Or Gerlitz <ogerlitz@...lanox.com>,
Noa Osherovich <noaos@...lanox.com>
Subject: [PATCH net-next 7/9] net/mlx4_en: Fix mac_hash database inconsistency
From: Noa Osherovich <noaos@...lanox.com>
When modifying dev->dev_addr by external kernel code (e.g. bonding
driver in ALB mode) The following issue may raise:
1) Kernel module updates dev->addr to a new MAC address
2) mlx4_en_do_set_rx_mode workqueue runs which calls -
mlx4_en_do_uc_filter. mlx4_en_do_uc_filter goes through the mac_hash
and removes the previous MAC address from the mac_hash.
3) Then mlx4_en_set_mac runs and calls mlx4_en_replace_mac in order to
replace previous mac with the new one, but since the mac_hash does
not contains the entry related to the prev_mac this operation fail.
The solution is to use a private variable to store and compare current
MAC address as dev->dev_addr can be accessed directly by any other
kernel code. This way a direct access to dev->dev_addr would not result
in mac_hash database inconsistency.
- priv->prev_mac was renamed to priv->current_mac.
- comparison in mlx4_en_do_uc_filter is to current_mac instead
of dev->dev_addr.
- added a new_mac parameter to mlx4_en_do_set_mac, and use it when
when updating mac_hash database.
Reviewed-by: Eyal Perry <eyalpe@...lanox.com>
Signed-off-by: Noa Osherovich <noaos@...lanox.com>
Signed-off-by: Amir Vadai <amirv@...lanox.com>
---
drivers/net/ethernet/mellanox/mlx4/en_netdev.c | 23 ++++++++++++++---------
drivers/net/ethernet/mellanox/mlx4/mlx4_en.h | 2 +-
2 files changed, 15 insertions(+), 10 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
index 9090643..4d38a2a 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
@@ -760,21 +760,22 @@ static int mlx4_en_replace_mac(struct mlx4_en_priv *priv, int qpn,
return __mlx4_replace_mac(dev, priv->port, qpn, new_mac_u64);
}
-static int mlx4_en_do_set_mac(struct mlx4_en_priv *priv)
+static int mlx4_en_do_set_mac(struct mlx4_en_priv *priv,
+ unsigned char new_mac[ETH_ALEN + 2])
{
int err = 0;
if (priv->port_up) {
/* Remove old MAC and insert the new one */
err = mlx4_en_replace_mac(priv, priv->base_qpn,
- priv->dev->dev_addr, priv->prev_mac);
+ new_mac, priv->current_mac);
if (err)
en_err(priv, "Failed changing HW MAC address\n");
} else
en_dbg(HW, priv, "Port is down while registering mac, exiting...\n");
- memcpy(priv->prev_mac, priv->dev->dev_addr,
- sizeof(priv->prev_mac));
+ if (!err)
+ memcpy(priv->current_mac, new_mac, sizeof(priv->current_mac));
return err;
}
@@ -784,14 +785,17 @@ 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;
+ unsigned char new_mac[ETH_ALEN + 2];
int err;
if (!is_valid_ether_addr(saddr->sa_data))
return -EADDRNOTAVAIL;
mutex_lock(&mdev->state_lock);
- memcpy(dev->dev_addr, saddr->sa_data, ETH_ALEN);
- err = mlx4_en_do_set_mac(priv);
+ memcpy(new_mac, saddr->sa_data, ETH_ALEN);
+ err = mlx4_en_do_set_mac(priv, new_mac);
+ if (!err)
+ memcpy(dev->dev_addr, saddr->sa_data, ETH_ALEN);
mutex_unlock(&mdev->state_lock);
return err;
@@ -1166,7 +1170,8 @@ static void mlx4_en_do_uc_filter(struct mlx4_en_priv *priv,
}
/* MAC address of the port is not in uc list */
- if (ether_addr_equal_64bits(entry->mac, dev->dev_addr))
+ if (ether_addr_equal_64bits(entry->mac,
+ priv->current_mac))
found = true;
if (!found) {
@@ -1476,7 +1481,7 @@ 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]) {
- mlx4_en_do_set_mac(priv);
+ mlx4_en_do_set_mac(priv, priv->current_mac);
mdev->mac_removed[MLX4_MAX_PORTS + 1 - priv->port] = 0;
}
mutex_unlock(&mdev->state_lock);
@@ -2501,7 +2506,7 @@ int mlx4_en_init_netdev(struct mlx4_en_dev *mdev, int port,
}
}
- memcpy(priv->prev_mac, dev->dev_addr, sizeof(priv->prev_mac));
+ memcpy(priv->current_mac, dev->dev_addr, sizeof(priv->current_mac));
priv->stride = roundup_pow_of_two(sizeof(struct mlx4_en_rx_desc) +
DS_SIZE * MLX4_EN_MAX_RX_FRAGS);
diff --git a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
index b5db1bf..88d5cf6 100644
--- a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
+++ b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
@@ -531,7 +531,7 @@ struct mlx4_en_priv {
int registered;
int allocated;
int stride;
- unsigned char prev_mac[ETH_ALEN + 2];
+ unsigned char current_mac[ETH_ALEN + 2];
int mac_index;
unsigned max_mtu;
int base_qpn;
--
1.8.3.4
--
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