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Date: Mon, 05 Jul 2010 22:05:22 +0200
From: Eric Dumazet <eric.dumazet@...il.com>
To: Ben Hutchings <bhutchings@...arflare.com>,
David Miller <davem@...emloft.net>
Cc: Stephen Hemminger <shemminger@...tta.com>,
Arnd Bergmann <arnd@...db.de>, netdev@...r.kernel.org,
linux-net-drivers@...arflare.com
Subject: [PATCH net-next-2.6 V2] net: fix 64 bit counters on 32 bit arches
Le lundi 05 juillet 2010 à 20:31 +0200, Eric Dumazet a écrit :
> One other way would be to add a rtnl_link_stats64 param to
> ndo_get_stats64() method, and ask drivers to copy their stats in this
> zone, instead of returning &dev->stats64 or something...
>
> And also change dev_get_stats() with this new parameter.
>
> Each caller would use a private copy, with no risk of concurrent
> updates.
>
>
Here is an updated patch, without added lock but temp storage.
Thanks
[PATCH net-next-2.6 V2] 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@...il.com>
---
drivers/net/bonding/bond_main.c | 64 +++++++++++++---------------
drivers/net/ixgbe/ixgbe_ethtool.c | 8 ++-
drivers/net/loopback.c | 4 -
drivers/net/macvlan.c | 6 +-
drivers/net/sfc/efx.c | 3 -
drivers/net/sfc/ethtool.c | 3 -
include/linux/netdevice.h | 12 +++--
net/8021q/vlan_dev.c | 6 --
net/8021q/vlanproc.c | 3 -
net/bridge/br_device.c | 4 -
net/core/dev.c | 25 +++++++---
net/core/net-sysfs.c | 4 +
net/core/rtnetlink.c | 3 -
13 files changed, 79 insertions(+), 66 deletions(-)
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index a95a41b..9bb9bfa 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 5275e9c..7e85e61 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 4dd0510..9a09967 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 e6d626e..6112f14 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 35b3f29..ba674c5 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 3b8b0a0..fd19d6a 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++) {
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 4d27368..60de653 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -666,7 +666,8 @@ struct netdev_rx_queue {
* Callback uses when the transmitter has not made any progress
* for dev->watchdog ticks.
*
- * struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev);
+ * struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev
+ * struct rtnl_link_stats64 *storage);
* struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
* Called when a user wants to get the network device usage
* statistics. Drivers must do one of the following:
@@ -733,7 +734,8 @@ struct net_device_ops {
struct neigh_parms *);
void (*ndo_tx_timeout) (struct net_device *dev);
- struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev);
+ struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
+ struct rtnl_link_stats64 *storage);
struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
void (*ndo_vlan_rx_register)(struct net_device *dev,
@@ -2139,8 +2141,10 @@ extern void netdev_features_change(struct net_device *dev);
/* Load a device via the kmod */
extern void dev_load(struct net *net, const char *name);
extern void dev_mcast_init(void);
-extern const struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev);
-extern void dev_txq_stats_fold(const struct net_device *dev, struct net_device_stats *stats);
+extern const struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
+ struct rtnl_link_stats64 *storage);
+extern void dev_txq_stats_fold(const struct net_device *dev,
+ struct net_device_stats *stats);
extern int netdev_max_backlog;
extern int netdev_tstamp_prequeue;
diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index c6456cb..7865a4c 100644
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -803,11 +803,9 @@ static u32 vlan_ethtool_get_flags(struct net_device *dev)
return dev_ethtool_get_flags(vlan->real_dev);
}
-static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev)
+static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
{
- struct rtnl_link_stats64 *stats = &dev->stats64;
-
- dev_txq_stats_fold(dev, &dev->stats);
+ dev_txq_stats_fold(dev, (struct net_device_stats *)stats);
if (vlan_dev_info(dev)->vlan_rx_stats) {
struct vlan_rx_stats *p, accum = {0};
diff --git a/net/8021q/vlanproc.c b/net/8021q/vlanproc.c
index df56f5c..80e280f 100644
--- a/net/8021q/vlanproc.c
+++ b/net/8021q/vlanproc.c
@@ -278,6 +278,7 @@ static int vlandev_seq_show(struct seq_file *seq, void *offset)
{
struct net_device *vlandev = (struct net_device *) seq->private;
const struct vlan_dev_info *dev_info = vlan_dev_info(vlandev);
+ struct rtnl_link_stats64 temp;
const struct rtnl_link_stats64 *stats;
static const char fmt[] = "%30s %12lu\n";
static const char fmt64[] = "%30s %12llu\n";
@@ -286,7 +287,7 @@ static int vlandev_seq_show(struct seq_file *seq, void *offset)
if (!is_vlan_dev(vlandev))
return 0;
- stats = dev_get_stats(vlandev);
+ stats = dev_get_stats(vlandev, &temp);
seq_printf(seq,
"%s VID: %d REORDER_HDR: %i dev->priv_flags: %hx\n",
vlandev->name, dev_info->vlan_id,
diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index edf639e..075c435 100644
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -98,10 +98,10 @@ static int br_dev_stop(struct net_device *dev)
return 0;
}
-static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev)
+static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev,
+ struct rtnl_link_stats64 *stats)
{
struct net_bridge *br = netdev_priv(dev);
- struct rtnl_link_stats64 *stats = &dev->stats64;
struct br_cpu_netstats tmp, sum = { 0 };
unsigned int cpu;
diff --git a/net/core/dev.c b/net/core/dev.c
index 93b8929..b6d570a 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3703,7 +3703,8 @@ void dev_seq_stop(struct seq_file *seq, void *v)
static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
{
- const struct rtnl_link_stats64 *stats = dev_get_stats(dev);
+ struct rtnl_link_stats64 temp;
+ const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
"%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
@@ -5281,23 +5282,29 @@ EXPORT_SYMBOL(dev_txq_stats_fold);
/**
* dev_get_stats - get network device statistics
* @dev: device to get statistics from
+ * @storage: place to store stats
*
* Get network statistics from device. The device driver may provide
* its own method by setting dev->netdev_ops->get_stats64 or
* dev->netdev_ops->get_stats; otherwise the internal statistics
* structure is used.
*/
-const struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev)
+const struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
+ struct rtnl_link_stats64 *storage)
{
const struct net_device_ops *ops = dev->netdev_ops;
- if (ops->ndo_get_stats64)
- return ops->ndo_get_stats64(dev);
- if (ops->ndo_get_stats)
- return (struct rtnl_link_stats64 *)ops->ndo_get_stats(dev);
-
- dev_txq_stats_fold(dev, &dev->stats);
- return &dev->stats64;
+ if (ops->ndo_get_stats64) {
+ memset(storage, 0, sizeof(*storage));
+ return ops->ndo_get_stats64(dev, storage);
+ }
+ if (ops->ndo_get_stats) {
+ memcpy(storage, ops->ndo_get_stats(dev), sizeof(*storage));
+ return storage;
+ }
+ memcpy(storage, &dev->stats, sizeof(*storage));
+ dev_txq_stats_fold(dev, (struct net_device_stats *)storage);
+ return storage;
}
EXPORT_SYMBOL(dev_get_stats);
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index ea3bb4c..914f42b 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -330,7 +330,9 @@ static ssize_t netstat_show(const struct device *d,
read_lock(&dev_base_lock);
if (dev_isalive(dev)) {
- const struct rtnl_link_stats64 *stats = dev_get_stats(dev);
+ struct rtnl_link_stats64 temp;
+ const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
+
ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset));
}
read_unlock(&dev_base_lock);
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index e645778..5e773ea 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -791,6 +791,7 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
{
struct ifinfomsg *ifm;
struct nlmsghdr *nlh;
+ struct rtnl_link_stats64 temp;
const struct rtnl_link_stats64 *stats;
struct nlattr *attr;
@@ -847,7 +848,7 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
if (attr == NULL)
goto nla_put_failure;
- stats = dev_get_stats(dev);
+ stats = dev_get_stats(dev, &temp);
copy_rtnl_link_stats(nla_data(attr), stats);
attr = nla_reserve(skb, IFLA_STATS64,
--
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