netdev - [RFC PATCH net-next 3/5] tcp: Add a few more tracepoints for tcp tracer

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Date:	Sun, 14 Dec 2014 17:56:44 -0800
From:	Martin KaFai Lau <kafai@...com>
To:	<netdev@...r.kernel.org>
CC:	"David S. Miller" <davem@...emloft.net>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Lawrence Brakmo <brakmo@...com>, Josef Bacik <jbacik@...com>,
	Kernel Team <Kernel-team@...com>
Subject: [RFC PATCH net-next 3/5] tcp: Add a few more tracepoints for tcp tracer

The tcp tracer, which will be added in the later patch, depends
on them to collect statistics.

Signed-off-by: Martin KaFai Lau <kafai@...com>
---
 include/trace/events/tcp.h | 15 +++++++++++++++
 net/ipv4/tcp_input.c       |  6 ++++++
 2 files changed, 21 insertions(+)

diff --git a/include/trace/events/tcp.h b/include/trace/events/tcp.h
index 81b40ef..440a26b 100644
--- a/include/trace/events/tcp.h
+++ b/include/trace/events/tcp.h
@@ -167,6 +167,21 @@ TRACE_EVENT(tcp_rcv_established,
 		  __entry->rcv_nxt, __entry->rcv_wnd)
 );
 
+DECLARE_TRACE(tcp_ooo_rcv,
+	      TP_PROTO(struct sock *sk),
+	      TP_ARGS(sk)
+);
+
+DECLARE_TRACE(tcp_sacks_rcv,
+	     TP_PROTO(struct sock *sk, int num_sacks),
+	     TP_ARGS(sk, num_sacks)
+);
+
+DECLARE_TRACE(tcp_rtt_sample,
+	      TP_PROTO(struct sock *sk, long rtt_sample_us),
+	      TP_ARGS(sk, rtt_sample_us)
+);
+
 #undef TCP_TRACE_ASSIGN_SA
 
 #endif /* _TRACE_TCP_H */
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 808fad7..1f82987 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1650,6 +1650,8 @@ tcp_sacktag_write_queue(struct sock *sk, const struct sk_buff *ack_skb,
 	int i, j;
 	int first_sack_index;
 
+	trace_tcp_sacks_rcv(sk, num_sacks);
+
 	state.flag = 0;
 	state.reord = tp->packets_out;
 	state.rtt_us = -1L;
@@ -2932,6 +2934,9 @@ static inline bool tcp_ack_update_rtt(struct sock *sk, const int flag,
 
 	/* RFC6298: only reset backoff on valid RTT measurement. */
 	inet_csk(sk)->icsk_backoff = 0;
+
+	trace_tcp_rtt_sample(sk, seq_rtt_us);
+
 	return true;
 }
 
@@ -4232,6 +4237,7 @@ static void tcp_data_queue_ofo(struct sock *sk, struct sk_buff *skb)
 	NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPOFOQUEUE);
 	SOCK_DEBUG(sk, "out of order segment: rcv_next %X seq %X - %X\n",
 		   tp->rcv_nxt, TCP_SKB_CB(skb)->seq, TCP_SKB_CB(skb)->end_seq);
+	trace_tcp_ooo_rcv(sk);
 
 	skb1 = skb_peek_tail(&tp->out_of_order_queue);
 	if (!skb1) {
-- 
1.8.1

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