neighbor: Add tracepoint to __neigh_create

Add tracepoint to __neigh_create to enable debugging of new entries.

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/trace/events/neigh.h b/include/trace/events/neigh.h
index 0bdb085..62bb175 100644 (file)
--- a/include/trace/events/neigh.h
+++ b/include/trace/events/neigh.h
@@ -20,6 +20,55 @@
                { NUD_NOARP, "noarp" },                 \
                { NUD_PERMANENT, "permanent"})
 
+TRACE_EVENT(neigh_create,
+
+       TP_PROTO(struct neigh_table *tbl, struct net_device *dev,
+                const void *pkey, const struct neighbour *n,
+                bool exempt_from_gc),
+
+       TP_ARGS(tbl, dev, pkey, n, exempt_from_gc),
+
+       TP_STRUCT__entry(
+               __field(u32, family)
+               __dynamic_array(char,  dev,   IFNAMSIZ )
+               __field(int, entries)
+               __field(u8, created)
+               __field(u8, gc_exempt)
+               __array(u8, primary_key4, 4)
+               __array(u8, primary_key6, 16)
+       ),
+
+       TP_fast_assign(
+               struct in6_addr *pin6;
+               __be32 *p32;
+
+               __entry->family = tbl->family;
+               __assign_str(dev, (dev ? dev->name : "NULL"));
+               __entry->entries = atomic_read(&tbl->gc_entries);
+               __entry->created = n != NULL;
+               __entry->gc_exempt = exempt_from_gc;
+               pin6 = (struct in6_addr *)__entry->primary_key6;
+               p32 = (__be32 *)__entry->primary_key4;
+
+               if (tbl->family == AF_INET)
+                       *p32 = *(__be32 *)pkey;
+               else
+                       *p32 = 0;
+
+#if IS_ENABLED(CONFIG_IPV6)
+               if (tbl->family == AF_INET6) {
+                       pin6 = (struct in6_addr *)__entry->primary_key6;
+                       *pin6 = *(struct in6_addr *)pkey;
+               }
+#endif
+       ),
+
+       TP_printk("family %d dev %s entries %d primary_key4 %pI4 primary_key6 %pI6c created %d gc_exempt %d",
+                 __entry->family, __get_str(dev), __entry->entries,
+                 __entry->primary_key4, __entry->primary_key6,
+                 __entry->created, __entry->gc_exempt)
+);
+
 TRACE_EVENT(neigh_update,
 
        TP_PROTO(struct neighbour *n, const u8 *lladdr, u8 new,

diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index dfa8710..a5556e4 100644 (file)
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -587,6 +587,8 @@ static struct neighbour *___neigh_create(struct neigh_table *tbl,
        int error;
        struct neigh_hash_table *nht;
 
+       trace_neigh_create(tbl, dev, pkey, n, exempt_from_gc);
+
        if (!n) {
                rc = ERR_PTR(-ENOBUFS);
                goto out;