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neighbor: Add tracepoint to __neigh_create

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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>
This commit is contained in:
David Ahern 2019-05-22 12:22:21 -07:00 committed by David S. Miller
parent a92a0a7b8e
commit fc651001d2
2 changed files with 51 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

49
include/trace/events/neigh.h
View file

@ -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,

2
net/core/neighbour.c
View file

@ -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;