Commit fc651001 authored by David Ahern's avatar David Ahern Committed by David S. Miller
Browse files

neighbor: Add tracepoint to __neigh_create 



Add tracepoint to __neigh_create to enable debugging of new entries.

Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent a92a0a7b

include/trace/events/neigh.h

+49 −0
Original line number Diff line number Diff line
@@ -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,

net/core/neighbour.c

+2 −0
Original line number Diff line number Diff line
@@ -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;