netdev - [Patch net-next 06/13] ipv4: introduce tracepoint trace_ip

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Date:   Thu,  5 Aug 2021 11:57:43 -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 06/13] ipv4: introduce tracepoint trace_ip_rcv()

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

Tracepoint trace_ip_rcv() is introduced to trace skb at the
entrance of IP 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 | 16 ++++++++++++++++
 net/ipv4/ip_input.c       |  2 ++
 2 files changed, 18 insertions(+)

diff --git a/include/trace/events/ip.h b/include/trace/events/ip.h
index 553ae7276732..20ee1a81405c 100644
--- a/include/trace/events/ip.h
+++ b/include/trace/events/ip.h
@@ -83,6 +83,22 @@ TRACE_EVENT(ip_queue_xmit,
 		  __entry->saddr_v6, __entry->daddr_v6, __entry->skbaddr)
 );
 
+TRACE_EVENT(ip_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 /* _TRACE_IP_H */
 
 /* This part must be outside protection */
diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
index 3a025c011971..2eb7a0cbc0d3 100644
--- a/net/ipv4/ip_input.c
+++ b/net/ipv4/ip_input.c
@@ -141,6 +141,7 @@
 #include <linux/mroute.h>
 #include <linux/netlink.h>
 #include <net/dst_metadata.h>
+#include <trace/events/ip.h>
 
 /*
  *	Process Router Attention IP option (RFC 2113)
@@ -400,6 +401,7 @@ static int ip_rcv_finish_core(struct net *net, struct sock *sk,
 			goto drop;
 	}
 
+	trace_ip_rcv(skb);
 	return NET_RX_SUCCESS;
 
 drop:
-- 
2.27.0