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net: fix 64 bit counters on 32 bit arches

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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 <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Eric Dumazet 2010-07-07 14:58:56 -07:00 • committed by David S. Miller
commit 28172739f0
18 changed files with 89 additions and 71 deletions
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3
arch/s390/appldata/appldata_net_sum.c
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@ -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;