netdev - [Patch net-next 07/13] ipv6: introduce tracepoint trace_ipv6

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Date:   Thu,  5 Aug 2021 11:57:44 -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 07/13] ipv6: introduce tracepoint trace_ipv6_rcv()

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

Tracepoint trace_ipv6_rcv() is introduced to trace skb at the
entrance of IPv6 layer on RX side.

Reviewed-by: Cong Wang <cong.wang@...edance.com>
Signed-off-by: Qitao Xu <qitao.xu@...edance.com>
---
 include/trace/events/ip.h | 18 ++++++++++++++++++
 net/core/net-traces.c     |  1 +
 net/ipv6/ip6_input.c      |  5 ++++-
 3 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/include/trace/events/ip.h b/include/trace/events/ip.h
index 20ee1a81405c..6cd0907728ce 100644
--- a/include/trace/events/ip.h
+++ b/include/trace/events/ip.h
@@ -99,6 +99,24 @@ TRACE_EVENT(ip_rcv,
 	TP_printk("skbaddr=%px", __entry->skbaddr)
 );
 
+#if IS_ENABLED(CONFIG_IPV6)
+TRACE_EVENT(ipv6_rcv,
+	TP_PROTO(const struct sk_buff *skb),
+
+	TP_ARGS(skb),
+
+	TP_STRUCT__entry(
+		__field(const void *, skbaddr)
+	),
+
+	TP_fast_assign(
+		__entry->skbaddr = skb;
+	),
+
+	TP_printk("skbaddr=%px", __entry->skbaddr)
+);
+#endif
+
 #endif /* _TRACE_IP_H */
 
 /* This part must be outside protection */
diff --git a/net/core/net-traces.c b/net/core/net-traces.c
index 0aca299dfb55..de5a13ae933c 100644
--- a/net/core/net-traces.c
+++ b/net/core/net-traces.c
@@ -64,4 +64,5 @@ 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);
+EXPORT_TRACEPOINT_SYMBOL_GPL(ipv6_rcv);
 #endif
diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c
index 80256717868e..8ce23ef5f011 100644
--- a/net/ipv6/ip6_input.c
+++ b/net/ipv6/ip6_input.c
@@ -44,6 +44,7 @@
 #include <net/xfrm.h>
 #include <net/inet_ecn.h>
 #include <net/dst_metadata.h>
+#include <trace/events/ip.h>
 
 INDIRECT_CALLABLE_DECLARE(void tcp_v6_early_demux(struct sk_buff *));
 static void ip6_rcv_finish_core(struct net *net, struct sock *sk,
@@ -59,8 +60,10 @@ static void ip6_rcv_finish_core(struct net *net, struct sock *sk,
 			INDIRECT_CALL_2(edemux, tcp_v6_early_demux,
 					udp_v6_early_demux, skb);
 	}
-	if (!skb_valid_dst(skb))
+	if (!skb_valid_dst(skb)) {
+		trace_ipv6_rcv(skb);
 		ip6_route_input(skb);
+	}
 }
 
 int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
-- 
2.27.0