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author | Eric Dumazet <eric.dumazet@gmail.com> | 2010-07-07 14:58:56 -0700 |
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committer | David S. Miller <davem@davemloft.net> | 2010-07-07 14:58:56 -0700 |
commit | 28172739f0a276eb8d6ca917b3974c2edb036da3 (patch) | |
tree | b1dc00cfa20c209992e247c6f73601f609f9ca3b /drivers/net/bonding | |
parent | 217d32dc5f299c483ca0d3c8cc6811c72c0339c4 (diff) | |
download | kernel_samsung_crespo-28172739f0a276eb8d6ca917b3974c2edb036da3.zip kernel_samsung_crespo-28172739f0a276eb8d6ca917b3974c2edb036da3.tar.gz kernel_samsung_crespo-28172739f0a276eb8d6ca917b3974c2edb036da3.tar.bz2 |
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/bonding')
-rw-r--r-- | drivers/net/bonding/bond_main.c | 64 |
1 files changed, 31 insertions, 33 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; |