[PATCH net-next 2/2] neigh: hook tracepoints in neigh update code

[Roopa Prabhu]

From: Roopa Prabhu <ro...@cumulusnetworks.com>

hook tracepoints at the end of functions that
update a neigh entry. neigh_update gets an additional
tracepoint to trace the update flags and old and new
neigh states.

Signed-off-by: Roopa Prabhu <ro...@cumulusnetworks.com>
---
 net/core/neighbour.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 4230400..30f6fd8 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -42,6 +42,8 @@
 #include <linux/inetdevice.h>
 #include <net/addrconf.h>
 
+#include <trace/events/neigh.h>
+
 #define DEBUG
 #define NEIGH_DEBUG 1
 #define neigh_dbg(level, fmt, ...)             \
@@ -102,6 +104,7 @@ static void neigh_cleanup_and_release(struct neighbour 
*neigh)
        if (neigh->parms->neigh_cleanup)
                neigh->parms->neigh_cleanup(neigh);
 
+       trace_neigh_cleanup_and_release(neigh, 0);
        __neigh_notify(neigh, RTM_DELNEIGH, 0, 0);
        call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, neigh);
        neigh_release(neigh);
@@ -1095,6 +1098,8 @@ static void neigh_timer_handler(struct timer_list *t)
        if (notify)
                neigh_update_notify(neigh, 0);
 
+       trace_neigh_timer_handler(neigh, 0);
+
        neigh_release(neigh);
 }
 
@@ -1165,6 +1170,7 @@ int __neigh_event_send(struct neighbour *neigh, struct 
sk_buff *skb)
        else
                write_unlock(&neigh->lock);
        local_bh_enable();
+       trace_neigh_event_send_done(neigh, rc);
        return rc;
 
 out_dead:
@@ -1172,6 +1178,7 @@ int __neigh_event_send(struct neighbour *neigh, struct 
sk_buff *skb)
                goto out_unlock_bh;
        write_unlock_bh(&neigh->lock);
        kfree_skb(skb);
+       trace_neigh_event_send_dead(neigh, 1);
        return 1;
 }
 EXPORT_SYMBOL(__neigh_event_send);
@@ -1227,6 +1234,8 @@ static int __neigh_update(struct neighbour *neigh, const 
u8 *lladdr,
        struct net_device *dev;
        int update_isrouter = 0;
 
+       trace_neigh_update(neigh, lladdr, new, flags, nlmsg_pid);
+
        write_lock_bh(&neigh->lock);
 
        dev    = neigh->dev;
@@ -1393,6 +1402,8 @@ static int __neigh_update(struct neighbour *neigh, const 
u8 *lladdr,
        if (notify)
                neigh_update_notify(neigh, nlmsg_pid);
 
+       trace_neigh_update_done(neigh, err);
+
        return err;
 }
 
-- 
2.1.4