From 296f7ea75b45913d5e2067baef0812087e0b6eb9 Mon Sep 17 00:00:00 2001
From: Satoru Moriya <satoru.moriya@hds.com>
Date: Fri, 17 Jun 2011 11:58:39 +0000
Subject: udp: add tracepoints for queueing skb to rcvbuf

This patch adds a tracepoint to __udp_queue_rcv_skb to get the
return value of ip_queue_rcv_skb. It indicates why kernel drops
a packet at this point.

ip_queue_rcv_skb returns following values in the packet drop case:

rcvbuf is full                 : -ENOMEM
sk_filter returns error        : -EINVAL, -EACCESS, -ENOMEM, etc.
__sk_mem_schedule returns error: -ENOBUF

Signed-off-by: Satoru Moriya <satoru.moriya@hds.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 net/core/net-traces.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'net/core')

diff --git a/net/core/net-traces.c b/net/core/net-traces.c
index 7f1bb2aba03b..13aab64520ad 100644
--- a/net/core/net-traces.c
+++ b/net/core/net-traces.c
@@ -28,6 +28,7 @@
 #include <trace/events/skb.h>
 #include <trace/events/net.h>
 #include <trace/events/napi.h>
+#include <trace/events/udp.h>
 
 EXPORT_TRACEPOINT_SYMBOL_GPL(kfree_skb);
 
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