Commit 22c2ad61 authored by Peter Oskolkov's avatar Peter Oskolkov Committed by David S. Miller

net: add a route cache full diagnostic message

In some testing scenarios, dst/route cache can fill up so quickly
that even an explicit GC call occasionally fails to clean it up. This leads
to sporadically failing calls to dst_alloc and "network unreachable" errors
to the user, which is confusing.

This patch adds a diagnostic message to make the cause of the failure
easier to determine.
Signed-off-by: default avatarPeter Oskolkov <posk@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 68d74315
...@@ -98,9 +98,13 @@ void *dst_alloc(struct dst_ops *ops, struct net_device *dev, ...@@ -98,9 +98,13 @@ void *dst_alloc(struct dst_ops *ops, struct net_device *dev,
struct dst_entry *dst; struct dst_entry *dst;
if (ops->gc && dst_entries_get_fast(ops) > ops->gc_thresh) { if (ops->gc && dst_entries_get_fast(ops) > ops->gc_thresh) {
if (ops->gc(ops)) if (ops->gc(ops)) {
printk_ratelimited(KERN_NOTICE "Route cache is full: "
"consider increasing sysctl "
"net.ipv[4|6].route.max_size.\n");
return NULL; return NULL;
} }
}
dst = kmem_cache_alloc(ops->kmem_cachep, GFP_ATOMIC); dst = kmem_cache_alloc(ops->kmem_cachep, GFP_ATOMIC);
if (!dst) if (!dst)
......
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