tipc: add trace_events for tipc bearer

The commit adds the new trace_event for TIPC bearer, L2 device event:

trace_tipc_l2_device_event()

Also, it puts the trace at the tipc_l2_device_event() function, then
the device/bearer events and related info can be traced out during
runtime when needed.

Acked-by: Ying Xue <ying.xue@windriver.com>
Tested-by: Ying Xue <ying.xue@windriver.com>
Acked-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: Tuong Lien <tuong.t.lien@dektech.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 45 insertions, 0 deletions

diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c
index e32294f37c29..fb2c0d8f359f 100644
--- a/net/tipc/bearer.c
+++ b/net/tipc/bearer.c
@@ -43,6 +43,7 @@
 #include "bcast.h"
 #include "netlink.h"
 #include "udp_media.h"
+#include "trace.h"
 
 #define MAX_ADDR_STR 60
 
@@ -608,6 +609,7 @@ static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
         if (!b)
                 return NOTIFY_DONE;
 
+        trace_tipc_l2_device_event(dev, b, evt);
         switch (evt) {
         case NETDEV_CHANGE:
                 if (netif_carrier_ok(dev) && netif_oper_up(dev)) {
diff --git a/net/tipc/trace.h b/net/tipc/trace.h
index 4d05141866aa..4d8e00483afc 100644
--- a/net/tipc/trace.h
+++ b/net/tipc/trace.h
@@ -113,6 +113,17 @@ enum {
                         {(0xcbe),       "SYNCH_BEGIN_EVT"               },\
                         {(0xcee),       "SYNCH_END_EVT"                 })
 
+/* Bearer, net device events: */
+#define dev_evt_sym(val)                                                  \
+        __print_symbolic(val,                                             \
+                        {(NETDEV_CHANGE),       "NETDEV_CHANGE"         },\
+                        {(NETDEV_GOING_DOWN),   "NETDEV_GOING_DOWN"     },\
+                        {(NETDEV_UP),           "NETDEV_UP"             },\
+                        {(NETDEV_CHANGEMTU),    "NETDEV_CHANGEMTU"      },\
+                        {(NETDEV_CHANGEADDR),   "NETDEV_CHANGEADDR"     },\
+                        {(NETDEV_UNREGISTER),   "NETDEV_UNREGISTER"     },\
+                        {(NETDEV_CHANGENAME),   "NETDEV_CHANGENAME"     })
+
 extern unsigned long sysctl_tipc_sk_filter[5] __read_mostly;
 
 int tipc_skb_dump(struct sk_buff *skb, bool more, char *buf);
@@ -378,6 +389,38 @@ DEFINE_EVENT(tipc_fsm_class, fsm_name, \
 DEFINE_FSM_EVENT(tipc_link_fsm);
 DEFINE_FSM_EVENT(tipc_node_fsm);
 
+TRACE_EVENT(tipc_l2_device_event,
+
+        TP_PROTO(struct net_device *dev, struct tipc_bearer *b,
+                 unsigned long evt),
+
+        TP_ARGS(dev, b, evt),
+
+        TP_STRUCT__entry(
+                __string(dev_name, dev->name)
+                __string(b_name, b->name)
+                __field(unsigned long, evt)
+                __field(u8, b_up)
+                __field(u8, carrier)
+                __field(u8, oper)
+        ),
+
+        TP_fast_assign(
+                __assign_str(dev_name, dev->name);
+                __assign_str(b_name, b->name);
+                __entry->evt = evt;
+                __entry->b_up = test_bit(0, &b->up);
+                __entry->carrier = netif_carrier_ok(dev);
+                __entry->oper = netif_oper_up(dev);
+        ),
+
+        TP_printk("%s on: <%s>/<%s> oper: %s carrier: %s bearer: %s\n",
+                  dev_evt_sym(__entry->evt), __get_str(dev_name),
+                  __get_str(b_name), (__entry->oper) ? "up" : "down",
+                  (__entry->carrier) ? "ok" : "notok",
+                  (__entry->b_up) ? "up" : "down")
+);
+
 #endif /* _TIPC_TRACE_H */
 
 /* This part must be outside protection */