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bridge: add tracepoint in br_fdb_update

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This extends bridge fdb table tracepoints to also cover
learned fdb entries in the br_fdb_update path. Note that
unlike other tracepoints I have moved this to when the fdb
is modified because this is in the datapath and can generate
a lot of noise in the trace output. br_fdb_update is also called
from added_by_user context in the NTF_USE case which is already
traced ..hence the !added_by_user check.

Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Acked-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Roopa Prabhu 2017-08-30 22:18:13 -07:00 committed by David S. Miller
parent 07d79fc7d9
commit e3cfddd577
3 changed files with 36 additions and 1 deletions
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31
include/trace/events/bridge.h
View File

@ -92,6 +92,37 @@ TRACE_EVENT(fdb_delete,
__entry->addr[4], __entry->addr[5], __entry->vid)
);
TRACE_EVENT(br_fdb_update,
TP_PROTO(struct net_bridge *br, struct net_bridge_port *source,
const unsigned char *addr, u16 vid, bool added_by_user),
TP_ARGS(br, source, addr, vid, added_by_user),
TP_STRUCT__entry(
__string(br_dev, br->dev->name)
__string(dev, source->dev->name)
__array(unsigned char, addr, ETH_ALEN)
__field(u16, vid)
__field(bool, added_by_user)
),
TP_fast_assign(
__assign_str(br_dev, br->dev->name);
__assign_str(dev, source->dev->name);
memcpy(__entry->addr, addr, ETH_ALEN);
__entry->vid = vid;
__entry->added_by_user = added_by_user;
),
TP_printk("br_dev %s source %s addr %02x:%02x:%02x:%02x:%02x:%02x vid %u added_by_user %d",
__get_str(br_dev), __get_str(dev), __entry->addr[0],
__entry->addr[1], __entry->addr[2], __entry->addr[3],
__entry->addr[4], __entry->addr[5], __entry->vid,
__entry->added_by_user)
);
#endif /* _TRACE_BRIDGE_H */
/* This part must be outside protection */

5
net/bridge/br_fdb.c
View File

@ -583,8 +583,10 @@ void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
fdb->updated = now;
if (unlikely(added_by_user))
fdb->added_by_user = 1;
if (unlikely(fdb_modified))
if (unlikely(fdb_modified)) {
trace_br_fdb_update(br, source, addr, vid, added_by_user);
fdb_notify(br, fdb, RTM_NEWNEIGH);
}
}
} else {
spin_lock(&br->hash_lock);
@ -593,6 +595,7 @@ void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
if (fdb) {
if (unlikely(added_by_user))
fdb->added_by_user = 1;
trace_br_fdb_update(br, source, addr, vid, added_by_user);
fdb_notify(br, fdb, RTM_NEWNEIGH);
}
}

1
net/core/net-traces.c
View File

@ -42,6 +42,7 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(fib6_table_lookup);
EXPORT_TRACEPOINT_SYMBOL_GPL(br_fdb_add);
EXPORT_TRACEPOINT_SYMBOL_GPL(br_fdb_external_learn_add);
EXPORT_TRACEPOINT_SYMBOL_GPL(fdb_delete);
EXPORT_TRACEPOINT_SYMBOL_GPL(br_fdb_update);
#endif
EXPORT_TRACEPOINT_SYMBOL_GPL(kfree_skb);