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| author |   David Ahern <dsahern@gmail.com> | 2019-05-22 12:22:21 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2019-05-22 17:50:24 -0700 |
| commit | fc651001d2c5ca4f8b87efae2edb69fca94a6365 (patch) | |
| tree | 7d06f313ea04c10863a802217891321339399d93 | |
| parent | selftests: pmtu: Simplify cleanup and namespace names (diff) | |
| download | linux-dev-fc651001d2c5ca4f8b87efae2edb69fca94a6365.tar.xz linux-dev-fc651001d2c5ca4f8b87efae2edb69fca94a6365.zip | |
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>
| -rw-r--r-- | include/trace/events/neigh.h | 49 | ||||
| -rw-r--r-- | net/core/neighbour.c | 2 |
2 files changed, 51 insertions, 0 deletions
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; |