[Patch net-next 11/13] tcp: introduce tracepoint trace_tcp_v4_rcv()
From: Cong Wang <hidden>
Date: 2021-08-05 18:58:13
Subsystem:
networking [general], networking [tcp], the rest, tracing · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Neal Cardwell, Linus Torvalds, Steven Rostedt, Masami Hiramatsu
From: Qitao Xu <redacted> Tracepoint trace_tcp_v4_rcv() is introduced to trace skb at the entrance of TCP layer on RX side. Reviewed-by: Cong Wang <redacted> Signed-off-by: Qitao Xu <redacted> --- 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)
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2.27.0