bridge: add tracepoint in br_fdb_update

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>

diff --git a/include/trace/events/bridge.h b/include/trace/events/bridge.h
index 0f1cde0..1bee3e7 100644 (file)
--- a/include/trace/events/bridge.h
+++ b/include/trace/events/bridge.h
@@ -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 */

diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
index be5e1da..4ea5c8b 100644 (file)
--- a/net/bridge/br_fdb.c
+++ b/net/bridge/br_fdb.c
@@ -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);
                        }
                }

diff --git a/net/core/net-traces.c b/net/core/net-traces.c
index 4a0292c..1132820 100644 (file)
--- a/net/core/net-traces.c
+++ b/net/core/net-traces.c
@@ -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);