From: David Ahern <dsah...@gmail.com>
Add tracepoint to __neigh_create to enable debugging of new entries.
Signed-off-by: David Ahern <dsah...@gmail.com>
---
include/trace/events/neigh.h | 49 ++++++++++++++++++++++++++++++++++++++++++++
net/core/neighbour.c | 2 ++
2 files changed, 51 insertions(+)
diff --git a/include/trace/events/neigh.h b/include/trace/events/neigh.h
index 0bdb08557763..62bb17516713 100644
--- 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 dfa871061f14..a5556e4d3f96 100644
--- 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;
--
2.11.0
