netdev - [Patch net-next 05/13] udp: introduce tracepoint trace_udp_v6_send

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Message-Id: <20210805185750.4522-6-xiyou.wangcong@gmail.com>
Date:   Thu,  5 Aug 2021 11:57:42 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     netdev@...r.kernel.org
Cc:     Qitao Xu <qitao.xu@...edance.com>,
        Cong Wang <cong.wang@...edance.com>
Subject: [Patch net-next 05/13] udp: introduce tracepoint trace_udp_v6_send_skb()

From: Qitao Xu <qitao.xu@...edance.com>

Tracepoint trace_udp_v6_send_skb() is introduced to trace skb
at the exit of UDPv6 layer on TX side.

Reviewed-by: Cong Wang <cong.wang@...edance.com>
Signed-off-by: Qitao Xu <qitao.xu@...edance.com>
---
 include/trace/events/udp.h | 21 +++++++++++++++++++++
 net/core/net-traces.c      |  3 +++
 net/ipv6/udp.c             |  2 ++
 3 files changed, 26 insertions(+)

diff --git a/include/trace/events/udp.h b/include/trace/events/udp.h
index 7babc1a11693..6af4b402237a 100644
--- a/include/trace/events/udp.h
+++ b/include/trace/events/udp.h
@@ -46,6 +46,27 @@ TRACE_EVENT(udp_send_skb,
 	TP_printk("skaddr=%px, skbaddr=%px", __entry->skaddr, __entry->skbaddr)
 );
 
+#if IS_ENABLED(CONFIG_IPV6)
+TRACE_EVENT(udp_v6_send_skb,
+
+	TP_PROTO(const struct sock *sk, const struct sk_buff *skb),
+
+	TP_ARGS(sk, skb),
+
+	TP_STRUCT__entry(
+		__field(const void *, skaddr)
+		__field(const void *, skbaddr)
+	),
+
+	TP_fast_assign(
+		__entry->skaddr = sk;
+		__entry->skbaddr = skb;
+	),
+
+	TP_printk("skaddr=%px, skbaddr=%px", __entry->skaddr, __entry->skbaddr)
+);
+#endif
+
 #endif /* _TRACE_UDP_H */
 
 /* This part must be outside protection */
diff --git a/net/core/net-traces.c b/net/core/net-traces.c
index e1bd46076ad0..0aca299dfb55 100644
--- a/net/core/net-traces.c
+++ b/net/core/net-traces.c
@@ -62,3 +62,6 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(napi_poll);
 
 EXPORT_TRACEPOINT_SYMBOL_GPL(tcp_send_reset);
 EXPORT_TRACEPOINT_SYMBOL_GPL(tcp_bad_csum);
+#if IS_ENABLED(CONFIG_IPV6)
+EXPORT_TRACEPOINT_SYMBOL_GPL(udp_v6_send_skb);
+#endif
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index c5e15e94bb00..84895ca40e5c 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -52,6 +52,7 @@
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 #include <trace/events/skb.h>
+#include <trace/events/udp.h>
 #include "udp_impl.h"
 
 static u32 udp6_ehashfn(const struct net *net,
@@ -1255,6 +1256,7 @@ static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6,
 	} else {
 		UDP6_INC_STATS(sock_net(sk),
 			       UDP_MIB_OUTDATAGRAMS, is_udplite);
+		trace_udp_v6_send_skb(sk, skb);
 	}
 	return err;
 }
-- 
2.27.0