From e8fce23946b7e7eadf25ad78d8207c22903dfe27 Mon Sep 17 00:00:00 2001
From: Song Liu <songliubraving@fb.com>
Date: Mon, 23 Oct 2017 09:20:27 -0700
Subject: tcp: add tracepoint trace_tcp_set_state()

This patch adds tracepoint trace_tcp_set_state. Besides usual fields
(s/d ports, IP addresses), old and new state of the socket is also
printed with TP_printk, with __print_symbolic().

Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 net/ipv4/tcp.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'net/ipv4/tcp.c')

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 8b1fa4dd4538..be07e9b6dbdd 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -282,6 +282,8 @@
 #include <asm/ioctls.h>
 #include <net/busy_poll.h>
 
+#include <trace/events/tcp.h>
+
 int sysctl_tcp_min_tso_segs __read_mostly = 2;
 
 int sysctl_tcp_autocorking __read_mostly = 1;
@@ -2040,6 +2042,8 @@ void tcp_set_state(struct sock *sk, int state)
 {
 	int oldstate = sk->sk_state;
 
+	trace_tcp_set_state(sk, oldstate, state);
+
 	switch (state) {
 	case TCP_ESTABLISHED:
 		if (oldstate != TCP_ESTABLISHED)
-- 
cgit