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ipv6: fix the use of pcpu_tstats in ip6_tunnel

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when read/write the 64bit data, the correct lock should be hold.

Fixes: 87b6d218f3 ("tunnel: implement 64 bits statistics")

Cc: Stephen Hemminger <stephen@networkplumber.org>
Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: Li RongQing <roy.qing.li@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Paul Keith <javelinanddart@gmail.com>
Change-Id: Ib90ecb495739eafb1563d5cfd3d2dc275e4944ea
This commit is contained in:
Li RongQing 2014-01-02 13:20:12 +08:00 committed by surblazer
parent 2e641339f3
commit a559d1f125
1 changed files with 16 additions and 5 deletions
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21
net/ipv6/ip6_tunnel.c
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@ -98,16 +98,25 @@ struct pcpu_tstats {
static struct net_device_stats *ip6_get_stats(struct net_device *dev)
{
struct pcpu_tstats sum = { 0 };
struct pcpu_tstats tmp, sum = { 0 };
int i;
for_each_possible_cpu(i) {
unsigned int start;
const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);
sum.rx_packets += tstats->rx_packets;
sum.rx_bytes += tstats->rx_bytes;
sum.tx_packets += tstats->tx_packets;
sum.tx_bytes += tstats->tx_bytes;
do {
start = u64_stats_fetch_begin_bh(&tstats->syncp);
tmp.rx_packets = tstats->rx_packets;
tmp.rx_bytes = tstats->rx_bytes;
tmp.tx_packets = tstats->tx_packets;
tmp.tx_bytes = tstats->tx_bytes;
} while (u64_stats_fetch_retry_bh(&tstats->syncp, start));
sum.rx_packets += tmp.rx_packets;
sum.rx_bytes += tmp.rx_bytes;
sum.tx_packets += tmp.tx_packets;
sum.tx_bytes += tmp.tx_bytes;
}
dev->stats.rx_packets = sum.rx_packets;
dev->stats.rx_bytes = sum.rx_bytes;
@ -761,8 +770,10 @@ static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol,
memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
tstats = this_cpu_ptr(t->dev->tstats);
u64_stats_update_begin(&tstats->syncp);
tstats->rx_packets++;
tstats->rx_bytes += skb->len;
u64_stats_update_end(&tstats->syncp);
__skb_tunnel_rx(skb, t->dev);