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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2010-07-07 14:58:56 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-07-07 14:58:56 -0700 |
| commit | 28172739f0a276eb8d6ca917b3974c2edb036da3 (patch) | |
| tree | b1dc00cfa20c209992e247c6f73601f609f9ca3b /drivers/net/sfc | |
| parent | 217d32dc5f299c483ca0d3c8cc6811c72c0339c4 (diff) | |
| download | linux-28172739f0a276eb8d6ca917b3974c2edb036da3.tar.gz linux-28172739f0a276eb8d6ca917b3974c2edb036da3.tar.bz2 linux-28172739f0a276eb8d6ca917b3974c2edb036da3.zip | |
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/sfc')
| -rw-r--r-- | drivers/net/sfc/efx.c | 3 | ||||
| -rw-r--r-- | drivers/net/sfc/ethtool.c | 3 |
2 files changed, 3 insertions, 3 deletions
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++) { |