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authorEric Dumazet <eric.dumazet@gmail.com>2010-07-07 14:58:56 -0700
committerDavid S. Miller <davem@davemloft.net>2010-07-07 14:58:56 -0700
commit28172739f0a276eb8d6ca917b3974c2edb036da3 (patch)
treeb1dc00cfa20c209992e247c6f73601f609f9ca3b /drivers/net
parent217d32dc5f299c483ca0d3c8cc6811c72c0339c4 (diff)
net: fix 64 bit counters on 32 bit arches
There is a small possibility that a reader gets incorrect values on 32 bit arches. SNMP applications could catch incorrect counters when a 32bit high part is changed by another stats consumer/provider. One way to solve this is to add a rtnl_link_stats64 param to all ndo_get_stats64() methods, and also add such a parameter to dev_get_stats(). Rule is that we are not allowed to use dev->stats64 as a temporary storage for 64bit stats, but a caller provided area (usually on stack) Old drivers (only providing get_stats() method) need no changes. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/bonding/bond_main.c64
-rw-r--r--drivers/net/ixgbe/ixgbe_ethtool.c8
-rw-r--r--drivers/net/loopback.c4
-rw-r--r--drivers/net/macvlan.c6
-rw-r--r--drivers/net/sfc/efx.c3
-rw-r--r--drivers/net/sfc/ethtool.c3
6 files changed, 44 insertions, 44 deletions
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index a95a41b74b4e..9bb9bfa225b6 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -3804,51 +3804,49 @@ static int bond_close(struct net_device *bond_dev)
return 0;
}
-static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev)
+static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
+ struct rtnl_link_stats64 *stats)
{
struct bonding *bond = netdev_priv(bond_dev);
- struct rtnl_link_stats64 *stats = &bond_dev->stats64;
- struct rtnl_link_stats64 local_stats;
+ struct rtnl_link_stats64 temp;
struct slave *slave;
int i;
- memset(&local_stats, 0, sizeof(local_stats));
+ memset(stats, 0, sizeof(*stats));
read_lock_bh(&bond->lock);
bond_for_each_slave(bond, slave, i) {
const struct rtnl_link_stats64 *sstats =
- dev_get_stats(slave->dev);
-
- local_stats.rx_packets += sstats->rx_packets;
- local_stats.rx_bytes += sstats->rx_bytes;
- local_stats.rx_errors += sstats->rx_errors;
- local_stats.rx_dropped += sstats->rx_dropped;
-
- local_stats.tx_packets += sstats->tx_packets;
- local_stats.tx_bytes += sstats->tx_bytes;
- local_stats.tx_errors += sstats->tx_errors;
- local_stats.tx_dropped += sstats->tx_dropped;
-
- local_stats.multicast += sstats->multicast;
- local_stats.collisions += sstats->collisions;
-
- local_stats.rx_length_errors += sstats->rx_length_errors;
- local_stats.rx_over_errors += sstats->rx_over_errors;
- local_stats.rx_crc_errors += sstats->rx_crc_errors;
- local_stats.rx_frame_errors += sstats->rx_frame_errors;
- local_stats.rx_fifo_errors += sstats->rx_fifo_errors;
- local_stats.rx_missed_errors += sstats->rx_missed_errors;
-
- local_stats.tx_aborted_errors += sstats->tx_aborted_errors;
- local_stats.tx_carrier_errors += sstats->tx_carrier_errors;
- local_stats.tx_fifo_errors += sstats->tx_fifo_errors;
- local_stats.tx_heartbeat_errors += sstats->tx_heartbeat_errors;
- local_stats.tx_window_errors += sstats->tx_window_errors;
+ dev_get_stats(slave->dev, &temp);
+
+ stats->rx_packets += sstats->rx_packets;
+ stats->rx_bytes += sstats->rx_bytes;
+ stats->rx_errors += sstats->rx_errors;
+ stats->rx_dropped += sstats->rx_dropped;
+
+ stats->tx_packets += sstats->tx_packets;
+ stats->tx_bytes += sstats->tx_bytes;
+ stats->tx_errors += sstats->tx_errors;
+ stats->tx_dropped += sstats->tx_dropped;
+
+ stats->multicast += sstats->multicast;
+ stats->collisions += sstats->collisions;
+
+ stats->rx_length_errors += sstats->rx_length_errors;
+ stats->rx_over_errors += sstats->rx_over_errors;
+ stats->rx_crc_errors += sstats->rx_crc_errors;
+ stats->rx_frame_errors += sstats->rx_frame_errors;
+ stats->rx_fifo_errors += sstats->rx_fifo_errors;
+ stats->rx_missed_errors += sstats->rx_missed_errors;
+
+ stats->tx_aborted_errors += sstats->tx_aborted_errors;
+ stats->tx_carrier_errors += sstats->tx_carrier_errors;
+ stats->tx_fifo_errors += sstats->tx_fifo_errors;
+ stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
+ stats->tx_window_errors += sstats->tx_window_errors;
}
- memcpy(stats, &local_stats, sizeof(struct net_device_stats));
-
read_unlock_bh(&bond->lock);
return stats;
diff --git a/drivers/net/ixgbe/ixgbe_ethtool.c b/drivers/net/ixgbe/ixgbe_ethtool.c
index b35ef36741ef..da54b38bb480 100644
--- a/drivers/net/ixgbe/ixgbe_ethtool.c
+++ b/drivers/net/ixgbe/ixgbe_ethtool.c
@@ -55,7 +55,7 @@ struct ixgbe_stats {
offsetof(struct ixgbe_adapter, m)
#define IXGBE_NETDEV_STAT(m) NETDEV_STATS, \
sizeof(((struct net_device *)0)->m), \
- offsetof(struct net_device, m)
+ offsetof(struct net_device, m) - offsetof(struct net_device, stats)
static struct ixgbe_stats ixgbe_gstrings_stats[] = {
{"rx_packets", IXGBE_NETDEV_STAT(stats.rx_packets)},
@@ -998,16 +998,18 @@ static void ixgbe_get_ethtool_stats(struct net_device *netdev,
struct ixgbe_adapter *adapter = netdev_priv(netdev);
u64 *queue_stat;
int stat_count = sizeof(struct ixgbe_queue_stats) / sizeof(u64);
+ struct rtnl_link_stats64 temp;
+ const struct rtnl_link_stats64 *net_stats;
int j, k;
int i;
char *p = NULL;
ixgbe_update_stats(adapter);
- dev_get_stats(netdev);
+ net_stats = dev_get_stats(netdev, &temp);
for (i = 0; i < IXGBE_GLOBAL_STATS_LEN; i++) {
switch (ixgbe_gstrings_stats[i].type) {
case NETDEV_STATS:
- p = (char *) netdev +
+ p = (char *) net_stats +
ixgbe_gstrings_stats[i].stat_offset;
break;
case IXGBE_STATS:
diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c
index 4dd0510d7a99..9a0996795321 100644
--- a/drivers/net/loopback.c
+++ b/drivers/net/loopback.c
@@ -98,10 +98,10 @@ static netdev_tx_t loopback_xmit(struct sk_buff *skb,
return NETDEV_TX_OK;
}
-static struct rtnl_link_stats64 *loopback_get_stats64(struct net_device *dev)
+static struct rtnl_link_stats64 *loopback_get_stats64(struct net_device *dev,
+ struct rtnl_link_stats64 *stats)
{
const struct pcpu_lstats __percpu *pcpu_lstats;
- struct rtnl_link_stats64 *stats = &dev->stats64;
u64 bytes = 0;
u64 packets = 0;
u64 drops = 0;
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index e6d626e78515..6112f1498940 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -431,12 +431,12 @@ static void macvlan_uninit(struct net_device *dev)
free_percpu(vlan->rx_stats);
}
-static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev)
+static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
+ struct rtnl_link_stats64 *stats)
{
- struct rtnl_link_stats64 *stats = &dev->stats64;
struct macvlan_dev *vlan = netdev_priv(dev);
- dev_txq_stats_fold(dev, &dev->stats);
+ dev_txq_stats_fold(dev, (struct net_device_stats *)stats);
if (vlan->rx_stats) {
struct macvlan_rx_stats *p, accum = {0};
diff --git a/drivers/net/sfc/efx.c b/drivers/net/sfc/efx.c
index 35b3f2922e5c..ba674c5ca29e 100644
--- a/drivers/net/sfc/efx.c
+++ b/drivers/net/sfc/efx.c
@@ -1533,11 +1533,10 @@ static int efx_net_stop(struct net_device *net_dev)
}
/* Context: process, dev_base_lock or RTNL held, non-blocking. */
-static struct rtnl_link_stats64 *efx_net_stats(struct net_device *net_dev)
+static struct rtnl_link_stats64 *efx_net_stats(struct net_device *net_dev, struct rtnl_link_stats64 *stats)
{
struct efx_nic *efx = netdev_priv(net_dev);
struct efx_mac_stats *mac_stats = &efx->mac_stats;
- struct rtnl_link_stats64 *stats = &net_dev->stats64;
spin_lock_bh(&efx->stats_lock);
efx->type->update_stats(efx);
diff --git a/drivers/net/sfc/ethtool.c b/drivers/net/sfc/ethtool.c
index 3b8b0a062749..fd19d6ab97a2 100644
--- a/drivers/net/sfc/ethtool.c
+++ b/drivers/net/sfc/ethtool.c
@@ -469,12 +469,13 @@ static void efx_ethtool_get_stats(struct net_device *net_dev,
struct efx_mac_stats *mac_stats = &efx->mac_stats;
struct efx_ethtool_stat *stat;
struct efx_channel *channel;
+ struct rtnl_link_stats64 temp;
int i;
EFX_BUG_ON_PARANOID(stats->n_stats != EFX_ETHTOOL_NUM_STATS);
/* Update MAC and NIC statistics */
- dev_get_stats(net_dev);
+ dev_get_stats(net_dev, &temp);
/* Fill detailed statistics buffer */
for (i = 0; i < EFX_ETHTOOL_NUM_STATS; i++) {