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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>
This commit is contained in:
Eric Dumazet 2010-07-07 14:58:56 -07:00 committed by David S. Miller
parent 217d32dc5f
commit 28172739f0
18 changed files with 84 additions and 66 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/s390/appldata/appldata_net_sum.c
View File

@ -85,7 +85,8 @@ static void appldata_get_net_sum_data(void *data)
rcu_read_lock();
for_each_netdev_rcu(&init_net, dev) {
const struct net_device_stats *stats = dev_get_stats(dev);
struct rtnl_link_stats64 temp;
const struct net_device_stats *stats = dev_get_stats(dev, &temp);
rx_packets += stats->rx_packets;
tx_packets += stats->tx_packets;

54
drivers/net/bonding/bond_main.c
View File

@ -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);
dev_get_stats(slave->dev, &temp);
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;
stats->rx_packets += sstats->rx_packets;
stats->rx_bytes += sstats->rx_bytes;
stats->rx_errors += sstats->rx_errors;
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;
stats->tx_packets += sstats->tx_packets;
stats->tx_bytes += sstats->tx_bytes;
stats->tx_errors += sstats->tx_errors;
stats->tx_dropped += sstats->tx_dropped;
local_stats.multicast += sstats->multicast;
local_stats.collisions += sstats->collisions;
stats->multicast += sstats->multicast;
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;
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;
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;
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;

8
drivers/net/ixgbe/ixgbe_ethtool.c
View File

@ -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:

4
drivers/net/loopback.c
View File

@ -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;

6
drivers/net/macvlan.c
View File

@ -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};

3
drivers/net/sfc/efx.c
View File

@ -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);

3
drivers/net/sfc/ethtool.c
View File

@ -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++) {

3
drivers/parisc/led.c
View File

@ -355,12 +355,13 @@ static __inline__ int led_get_net_activity(void)
rcu_read_lock();
for_each_netdev_rcu(&init_net, dev) {
const struct net_device_stats *stats;
struct rtnl_link_stats64 temp;
struct in_device *in_dev = __in_dev_get_rcu(dev);
if (!in_dev || !in_dev->ifa_list)
continue;
if (ipv4_is_loopback(in_dev->ifa_list->ifa_local))
continue;
stats = dev_get_stats(dev);
stats = dev_get_stats(dev, &temp);
rx_total += stats->rx_packets;
tx_total += stats->tx_packets;
}

3
drivers/scsi/fcoe/fcoe.c
View File

@ -2653,6 +2653,7 @@ static void fcoe_get_lesb(struct fc_lport *lport,
u32 lfc, vlfc, mdac;
struct fcoe_dev_stats *devst;
struct fcoe_fc_els_lesb *lesb;
struct rtnl_link_stats64 temp;
struct net_device *netdev = fcoe_netdev(lport);
lfc = 0;
@ -2669,7 +2670,7 @@ static void fcoe_get_lesb(struct fc_lport *lport,
lesb->lesb_link_fail = htonl(lfc);
lesb->lesb_vlink_fail = htonl(vlfc);
lesb->lesb_miss_fka = htonl(mdac);
lesb->lesb_fcs_error = htonl(dev_get_stats(netdev)->rx_crc_errors);
lesb->lesb_fcs_error = htonl(dev_get_stats(netdev, &temp)->rx_crc_errors);
}
/**

3
drivers/staging/batman-adv/hard-interface.c
View File

@ -440,6 +440,7 @@ int batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
struct batman_packet *batman_packet;
struct batman_if *batman_if;
struct net_device_stats *stats;
struct rtnl_link_stats64 temp;
int ret;
skb = skb_share_check(skb, GFP_ATOMIC);
@ -468,7 +469,7 @@ int batman_skb_recv(struct sk_buff *skb, struct net_device *dev,
if (batman_if->if_status != IF_ACTIVE)
goto err_free;
stats = (struct net_device_stats *)dev_get_stats(skb->dev);
stats = (struct net_device_stats *)dev_get_stats(skb->dev, &temp);
if (stats) {
stats->rx_packets++;
stats->rx_bytes += skb->len;

3
drivers/usb/gadget/rndis.c
View File

@ -171,6 +171,7 @@ gen_ndis_query_resp (int configNr, u32 OID, u8 *buf, unsigned buf_len,
int i, count;
rndis_query_cmplt_type *resp;
struct net_device *net;
struct rtnl_link_stats64 temp;
const struct rtnl_link_stats64 *stats;
if (!r) return -ENOMEM;
@ -194,7 +195,7 @@ gen_ndis_query_resp (int configNr, u32 OID, u8 *buf, unsigned buf_len,
resp->InformationBufferOffset = cpu_to_le32 (16);
net = rndis_per_dev_params[configNr].dev;
stats = dev_get_stats(net);
stats = dev_get_stats(net, &temp);
switch (OID) {

12
include/linux/netdevice.h
View File

@ -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;

6
net/8021q/vlan_dev.c
View File

@ -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};

3
net/8021q/vlanproc.c
View File

@ -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,

4
net/bridge/br_device.c
View File

@ -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;

25
net/core/dev.c
View File

@ -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);

4
net/core/net-sysfs.c
View File

@ -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);

3
net/core/rtnetlink.c
View File

@ -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,