diff options
author | Li RongQing <roy.qing.li@gmail.com> | 2014-01-02 13:20:12 +0800 |
---|---|---|
committer | Willy Tarreau <w@1wt.eu> | 2017-06-08 00:47:10 +0200 |
commit | abcfcd047b66d66de0cbe2f79b30127274154623 (patch) | |
tree | 9921a143bf1e98df28986e877fc7a6909ebc60d5 | |
parent | e246c0986e5c48b97d1532720de2ff4dfaccc3ac (diff) |
ipv6: fix the use of pcpu_tstats in ip6_tunnel
commit abb6013cca147ad940b0e9fee260d2d9e93b7018 upstream.
when read/write the 64bit data, the correct lock should be hold.
Fixes: 87b6d218f3adb ("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: Willy Tarreau <w@1wt.eu>
-rw-r--r-- | net/ipv6/ip6_tunnel.c | 21 |
1 files changed, 16 insertions, 5 deletions
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c index 61a89951e7fe..efc77acbe9e1 100644 --- a/net/ipv6/ip6_tunnel.c +++ b/net/ipv6/ip6_tunnel.c @@ -103,16 +103,25 @@ struct ip6_tnl_net { 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; @@ -832,8 +841,10 @@ static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol, } 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); netif_rx(skb); |