netdev - [Patch net-next 11/13] tcp: introduce tracepoint trace_tcp_v4

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Date:   Thu,  5 Aug 2021 11:57:48 -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 11/13] tcp: introduce tracepoint trace_tcp_v4_rcv()

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

Tracepoint trace_tcp_v4_rcv() is introduced to trace skb at
the entrance of TCP layer on RX side.

Reviewed-by: Cong Wang <cong.wang@...edance.com>
Signed-off-by: Qitao Xu <qitao.xu@...edance.com>
---
 include/trace/events/tcp.h | 7 +++++++
 net/ipv4/tcp_ipv4.c        | 2 ++
 2 files changed, 9 insertions(+)

diff --git a/include/trace/events/tcp.h b/include/trace/events/tcp.h
index 6147528d93ba..adf84866dee9 100644
--- a/include/trace/events/tcp.h
+++ b/include/trace/events/tcp.h
@@ -109,6 +109,13 @@ DEFINE_EVENT(tcp_event_sk_skb, tcp_retransmit_skb,
 	TP_ARGS(sk, skb)
 );
 
+DEFINE_EVENT(tcp_event_sk_skb, tcp_v4_rcv,
+
+	TP_PROTO(const struct sock *sk, const struct sk_buff *skb),
+
+	TP_ARGS(sk, skb)
+);
+
 /*
  * skb of trace_tcp_send_reset is the skb that caused RST. In case of
  * active reset, skb should be NULL
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 2e62e0d6373a..a0c4aa488659 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2093,6 +2093,8 @@ int tcp_v4_rcv(struct sk_buff *skb)
 	bh_unlock_sock(sk);
 	if (skb_to_free)
 		__kfree_skb(skb_to_free);
+	if (!ret)
+		trace_tcp_v4_rcv(sk, skb);
 
 put_and_return:
 	if (refcounted)
-- 
2.27.0