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authorFrancesco Ruggeri <fruggeri@arista.com>2017-11-08 22:23:46 +0300
committerDavid S. Miller <davem@davemloft.net>2017-11-13 04:13:04 +0300
commit338d182fa542b3ca05456ad1ce9cebe6580083b1 (patch)
tree597daa1cb98dba8fe8c2b679646ae7a9c8f0fa41 /net/ipv6/ip6mr.c
parent07842561a873e8f25272bcebe7f6c7f1af7c1a2d (diff)
downloadlinux-338d182fa542b3ca05456ad1ce9cebe6580083b1.tar.xz
ipv6: try not to take rtnl_lock in ip6mr_sk_done
Avoid traversing the list of mr6_tables (which requires the rtnl_lock) in ip6mr_sk_done(), when we know in advance that a match will not be found. This can happen when rawv6_close()/ip6mr_sk_done() is invoked on non-mroute6 sockets. This patch helps reduce rtnl_lock contention when destroying a large number of net namespaces, each having a non-mroute6 raw socket. v2: same patch, only fixed subject line and expanded comment. Signed-off-by: Francesco Ruggeri <fruggeri@arista.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/ip6mr.c')
-rw-r--r--net/ipv6/ip6mr.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index 59fad81e5f7a..9c24b85949c1 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -1617,6 +1617,10 @@ int ip6mr_sk_done(struct sock *sk)
struct net *net = sock_net(sk);
struct mr6_table *mrt;
+ if (sk->sk_type != SOCK_RAW ||
+ inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
+ return err;
+
rtnl_lock();
ip6mr_for_each_table(mrt, net) {
if (sk == mrt->mroute6_sk) {