[PATCH net-next] net: Add net_cookie to Dead loop messages

[Chris J Arges <carges@cloudflare.com>]

Network devices can have the same name within different network namespaces.
To help distinguish these devices, add the net_cookie value which can be
used to identify the netns.

Signed-off-by: Chris J Arges <carges@cloudflare.com>
---
 net/core/dev.c            | 4 ++--
 net/ipv4/ip_tunnel_core.c | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index 831129f2a69b..a9718fe9d12c 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4875,8 +4875,8 @@ int __dev_queue_xmit(struct sk_buff *skb, struct net_device *sb_dev)
 			 * unfortunately
 			 */
 recursion_alert:
-			net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
-					     dev->name);
+			net_crit_ratelimited("Dead loop on virtual device %s (net %llu), fix it urgently!\n",
+					     dev->name, dev_net(dev)->net_cookie);
 			rc = -ENETDOWN;
 		}
 	}
diff --git a/net/ipv4/ip_tunnel_core.c b/net/ipv4/ip_tunnel_core.c
index 5683c328990f..a41bcf7ddc06 100644
--- a/net/ipv4/ip_tunnel_core.c
+++ b/net/ipv4/ip_tunnel_core.c
@@ -60,8 +60,8 @@ void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
 
 	if (unlikely(dev_recursion_level() > IP_TUNNEL_RECURSION_LIMIT)) {
 		if (dev) {
-			net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
-					     dev->name);
+			net_crit_ratelimited("Dead loop on virtual device %s (net %llu), fix it urgently!\n",
+					     dev->name, dev_net(dev)->net_cookie);
 			DEV_STATS_INC(dev, tx_errors);
 		}
 		ip_rt_put(rt);
-- 
2.43.0