ipv6_tunnel: Rate limit warning messages

The warning messages can be invoked from the data path for every packet
transmitted through an ip6gre netdev, leading to high CPU utilization.

Fix that by rate limiting the messages.

Fixes: 09c6bbf090ec ("[IPV6]: Do mandatory IPv6 tunnel endpoint checks in realtime")
Reported-by: Maksym Yaremchuk <maksymy@nvidia.com>
Tested-by: Maksym Yaremchuk <maksymy@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Amit Cohen <amcohen@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index fe786df4f8493396b803002d25701affd59ee96c..97ade833f58cc29f3fb3b681b017526da76b72da 100644 (file)
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -1036,14 +1036,14 @@ int ip6_tnl_xmit_ctl(struct ip6_tnl *t,
 
                if (unlikely(!ipv6_chk_addr_and_flags(net, laddr, ldev, false,
                                                      0, IFA_F_TENTATIVE)))
-                       pr_warn("%s xmit: Local address not yet configured!\n",
-                               p->name);
+                       pr_warn_ratelimited("%s xmit: Local address not yet configured!\n",
+                                           p->name);
                else if (!(p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) &&
                         !ipv6_addr_is_multicast(raddr) &&
                         unlikely(ipv6_chk_addr_and_flags(net, raddr, ldev,
                                                          true, 0, IFA_F_TENTATIVE)))
-                       pr_warn("%s xmit: Routing loop! Remote address found on this node!\n",
-                               p->name);
+                       pr_warn_ratelimited("%s xmit: Routing loop! Remote address found on this node!\n",
+                                           p->name);
                else
                        ret = 1;
                rcu_read_unlock();