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authorEric Dumazet <eric.dumazet@gmail.com>2009-11-18 10:09:39 +0300
committerDavid S. Miller <davem@davemloft.net>2009-11-20 00:16:22 +0300
commit2b1c8b0f925c3f5943cf95d263d72927baae88e7 (patch)
tree956b46cc040504a0545065184e322ff596ef5d16
parent56cf54831fd1be105e89a9df899e3b22442da180 (diff)
downloadlinux-2b1c8b0f925c3f5943cf95d263d72927baae88e7.tar.xz
veth: Fix veth_get_stats()
veth_get_stats() can be called in parallel on several cpus. It's better to not reset dev->stats as it could give wrong result on one cpu. Use temporary variables, then store the final results. Also, we should loop on every possible cpus, not only online cpus, or cpu hotplug can suddenly give wrong veth stats. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/veth.c35
1 files changed, 16 insertions, 19 deletions
diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index ade5b344f75d..52af5017c46b 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -210,32 +210,29 @@ rx_drop:
static struct net_device_stats *veth_get_stats(struct net_device *dev)
{
struct veth_priv *priv;
- struct net_device_stats *dev_stats;
int cpu;
- struct veth_net_stats *stats;
+ struct veth_net_stats *stats, total = {0};
priv = netdev_priv(dev);
- dev_stats = &dev->stats;
-
- dev_stats->rx_packets = 0;
- dev_stats->tx_packets = 0;
- dev_stats->rx_bytes = 0;
- dev_stats->tx_bytes = 0;
- dev_stats->tx_dropped = 0;
- dev_stats->rx_dropped = 0;
- for_each_online_cpu(cpu) {
+ for_each_possible_cpu(cpu) {
stats = per_cpu_ptr(priv->stats, cpu);
- dev_stats->rx_packets += stats->rx_packets;
- dev_stats->tx_packets += stats->tx_packets;
- dev_stats->rx_bytes += stats->rx_bytes;
- dev_stats->tx_bytes += stats->tx_bytes;
- dev_stats->tx_dropped += stats->tx_dropped;
- dev_stats->rx_dropped += stats->rx_dropped;
+ total.rx_packets += stats->rx_packets;
+ total.tx_packets += stats->tx_packets;
+ total.rx_bytes += stats->rx_bytes;
+ total.tx_bytes += stats->tx_bytes;
+ total.tx_dropped += stats->tx_dropped;
+ total.rx_dropped += stats->rx_dropped;
}
-
- return dev_stats;
+ dev->stats.rx_packets = total.rx_packets;
+ dev->stats.tx_packets = total.tx_packets;
+ dev->stats.rx_bytes = total.rx_bytes;
+ dev->stats.tx_bytes = total.tx_bytes;
+ dev->stats.tx_dropped = total.tx_dropped;
+ dev->stats.rx_dropped = total.rx_dropped;
+
+ return &dev->stats;
}
static int veth_open(struct net_device *dev)