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Date: Sun, 14 Dec 2014 17:56:42 -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 1/5] tcp: Add TCP TRACE_EVENTs
Add TRACE_EVENT when:
1. connection established
2. segs received
3. segs sending out
4. connection close
Signed-off-by: Martin KaFai Lau <kafai@...com>
---
include/trace/events/tcp.h | 175 +++++++++++++++++++++++++++++++++++++++++++++
net/core/net-traces.c | 1 +
net/ipv4/tcp.c | 6 +-
net/ipv4/tcp_input.c | 3 +
net/ipv4/tcp_output.c | 3 +
5 files changed, 187 insertions(+), 1 deletion(-)
create mode 100644 include/trace/events/tcp.h
diff --git a/include/trace/events/tcp.h b/include/trace/events/tcp.h
new file mode 100644
index 0000000..81b40ef
--- /dev/null
+++ b/include/trace/events/tcp.h
@@ -0,0 +1,175 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM tcp
+
+#if !defined(_TRACE_TCP_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_TCP_H
+
+#include <net/sock.h>
+#include <net/inet_sock.h>
+#include <net/tcp.h>
+#include <linux/skbuff.h>
+#include <linux/ipv6.h>
+#include <linux/tracepoint.h>
+#include <uapi/linux/in6.h>
+
+#define TCP_TRACE_ASSIGN_SA(e, sk) do { \
+ (e)->lport = inet_sk((sk))->inet_sport; \
+ (e)->rport = inet_sk((sk))->inet_dport; \
+ if ((sk)->sk_family == AF_INET) { \
+ (e)->ipv6 = 0; \
+ memset((e)->laddr, 0, sizeof((e)->laddr)); \
+ memset((e)->raddr, 0, sizeof((e)->raddr)); \
+ memcpy((e)->laddr, &inet_sk((sk))->inet_saddr, \
+ sizeof(inet_sk((sk))->inet_saddr)); \
+ memcpy((e)->raddr, &inet_sk((sk))->inet_daddr, \
+ sizeof(inet_sk((sk))->inet_daddr)); \
+ } else { \
+ (e)->ipv6 = 1; \
+ memcpy((e)->laddr, inet6_sk((sk))->saddr.s6_addr, \
+ sizeof((e)->laddr)); \
+ memcpy((e)->raddr, (sk)->sk_v6_daddr.s6_addr, \
+ sizeof((e)->raddr)); \
+ } \
+} while (0)
+
+DECLARE_EVENT_CLASS(tcp,
+ TP_PROTO(struct sock *sk),
+ TP_ARGS(sk),
+ TP_STRUCT__entry(
+ __field(u8, ipv6)
+ __array(u8, laddr, 16)
+ __array(u8, raddr, 16)
+ __field(u16, lport)
+ __field(u16, rport)
+ __field(u32, snd_cwnd)
+ __field(u32, mss_cache)
+ __field(u32, ssthresh)
+ __field(u64, srtt_us)
+ __field(u32, rto_ms)
+ ),
+ TP_fast_assign(
+ TCP_TRACE_ASSIGN_SA(__entry, sk);
+ __entry->snd_cwnd = tcp_sk(sk)->snd_cwnd;
+ __entry->mss_cache = tcp_sk(sk)->mss_cache;
+ __entry->ssthresh = tcp_current_ssthresh(sk);
+ __entry->srtt_us = tcp_sk(sk)->srtt_us >> 3;
+ __entry->rto_ms = jiffies_to_msecs(inet_csk(sk)->icsk_rto);
+ ),
+ TP_printk("local=%s:%d remote=%s:%d snd_cwnd=%u mss_cache=%u "
+ "ssthresh=%u srtt_us=%llu rto_ms=%u",
+ __print_hex(__entry->laddr, 16),
+ __entry->lport,
+ __print_hex(__entry->raddr, 16),
+ __entry->rport,
+ __entry->snd_cwnd, __entry->mss_cache,
+ __entry->ssthresh, __entry->srtt_us, __entry->rto_ms)
+);
+
+DEFINE_EVENT(tcp,
+ tcp_established,
+ TP_PROTO(struct sock *sk),
+ TP_ARGS(sk)
+);
+
+DEFINE_EVENT(tcp,
+ tcp_close,
+ TP_PROTO(struct sock *sk),
+ TP_ARGS(sk)
+);
+
+TRACE_EVENT(tcp_transmit_skb,
+ TP_PROTO(struct sock *sk, struct sk_buff *skb),
+ TP_ARGS(sk, skb),
+ TP_STRUCT__entry(
+ __field(u8, ipv6)
+ __array(u8, laddr, 16)
+ __array(u8, raddr, 16)
+ __field(u16, lport)
+ __field(u16, rport)
+ __field(u32, seq)
+ __field(u32, end_seq)
+ __field(u32, pcount)
+ __field(u8, ca_state)
+ __field(u32, snd_nxt)
+ __field(u32, snd_una)
+ __field(u32, snd_wnd)
+ __field(u32, snd_cwnd)
+ __field(u32, mss_cache)
+ __field(u32, ssthresh)
+ __field(u64, srtt_us)
+ __field(u32, rto_ms)
+ ),
+ TP_fast_assign(
+ TCP_TRACE_ASSIGN_SA(__entry, sk);
+ __entry->seq = TCP_SKB_CB(skb)->seq;
+ __entry->end_seq = TCP_SKB_CB(skb)->end_seq;
+ __entry->pcount = tcp_skb_pcount(skb);
+ __entry->ca_state = inet_csk(sk)->icsk_ca_state;
+ __entry->snd_nxt = tcp_sk(sk)->snd_nxt;
+ __entry->snd_una = tcp_sk(sk)->snd_una;
+ __entry->snd_wnd = tcp_sk(sk)->snd_wnd;
+ __entry->snd_cwnd = tcp_sk(sk)->snd_cwnd;
+ __entry->mss_cache = tcp_sk(sk)->mss_cache;
+ __entry->ssthresh = tcp_current_ssthresh(sk);
+ __entry->srtt_us = tcp_sk(sk)->srtt_us >> 3;
+ __entry->rto_ms = jiffies_to_msecs(inet_csk(sk)->icsk_rto);
+ ),
+ TP_printk("local=%s:%d remote=%s:%d "
+ "skb_seq=%u skb_end_seq=%u pcount=%u ca_state=%x "
+ "snd_nxt=%u snd_una=%u snd_wnd=%u snd_cwnd=%u mss_cache=%u "
+ "ssthresh=%u srtt_us=%llu rto_ms=%u",
+ __print_hex(__entry->laddr, 16), __entry->lport,
+ __print_hex(__entry->raddr, 16), __entry->rport,
+
+ __entry->seq, __entry->end_seq, __entry->pcount,
+ __entry->ca_state,
+
+ __entry->snd_nxt, __entry->snd_una, __entry->snd_wnd,
+ __entry->snd_cwnd, __entry->mss_cache,
+
+ __entry->ssthresh, __entry->srtt_us, __entry->rto_ms)
+);
+
+TRACE_EVENT(tcp_rcv_established,
+ TP_PROTO(struct sock *sk, struct sk_buff *skb),
+ TP_ARGS(sk, skb),
+ TP_STRUCT__entry(
+ __field(u8, ipv6)
+ __array(u8, laddr, 16)
+ __array(u8, raddr, 16)
+ __field(u16, lport)
+ __field(u16, rport)
+ __field(u32, seq)
+ __field(u32, end_seq)
+ __field(u32, ack_seq)
+ __field(u32, snd_una)
+ __field(u32, rcv_nxt)
+ __field(u32, rcv_wnd)
+ ),
+ TP_fast_assign(
+ TCP_TRACE_ASSIGN_SA(__entry, sk);
+ __entry->seq = TCP_SKB_CB(skb)->seq;
+ __entry->end_seq = TCP_SKB_CB(skb)->end_seq;
+ __entry->ack_seq = TCP_SKB_CB(skb)->ack_seq;
+ __entry->snd_una = tcp_sk(sk)->snd_una;
+ __entry->rcv_nxt = tcp_sk(sk)->rcv_nxt;
+ __entry->rcv_wnd = tcp_sk(sk)->rcv_wnd;
+ ),
+ TP_printk("local=%s:%d remote=%s:%d "
+ "skb_seq=%u skb_end_seq=%u skb_ack_seq=%u snd_una=%u "
+ "rcv_nxt=%u, rcv_wnd=%u",
+ __print_hex(__entry->laddr, 16), __entry->lport,
+ __print_hex(__entry->raddr, 16), __entry->rport,
+
+ __entry->seq, __entry->end_seq, __entry->ack_seq,
+ __entry->snd_una,
+
+ __entry->rcv_nxt, __entry->rcv_wnd)
+);
+
+#undef TCP_TRACE_ASSIGN_SA
+
+#endif /* _TRACE_TCP_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/net/core/net-traces.c b/net/core/net-traces.c
index ba3c012..63f966b 100644
--- a/net/core/net-traces.c
+++ b/net/core/net-traces.c
@@ -31,6 +31,7 @@
#include <trace/events/napi.h>
#include <trace/events/sock.h>
#include <trace/events/udp.h>
+#include <trace/events/tcp.h>
EXPORT_TRACEPOINT_SYMBOL_GPL(kfree_skb);
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 3075723..3b887fa 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -275,6 +275,7 @@
#include <net/xfrm.h>
#include <net/ip.h>
#include <net/sock.h>
+#include <trace/events/tcp.h>
#include <asm/uaccess.h>
#include <asm/ioctls.h>
@@ -1901,8 +1902,10 @@ void tcp_set_state(struct sock *sk, int state)
switch (state) {
case TCP_ESTABLISHED:
- if (oldstate != TCP_ESTABLISHED)
+ if (oldstate != TCP_ESTABLISHED) {
TCP_INC_STATS(sock_net(sk), TCP_MIB_CURRESTAB);
+ trace_tcp_established(sk);
+ }
break;
case TCP_CLOSE:
@@ -1913,6 +1916,7 @@ void tcp_set_state(struct sock *sk, int state)
if (inet_csk(sk)->icsk_bind_hash &&
!(sk->sk_userlocks & SOCK_BINDPORT_LOCK))
inet_put_port(sk);
+ trace_tcp_close(sk);
/* fall through */
default:
if (oldstate == TCP_ESTABLISHED)
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 075ab4d..808fad7 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -75,6 +75,7 @@
#include <linux/ipsec.h>
#include <asm/unaligned.h>
#include <linux/errqueue.h>
+#include <trace/events/tcp.h>
int sysctl_tcp_timestamps __read_mostly = 1;
int sysctl_tcp_window_scaling __read_mostly = 1;
@@ -5076,6 +5077,8 @@ void tcp_rcv_established(struct sock *sk, struct sk_buff *skb,
{
struct tcp_sock *tp = tcp_sk(sk);
+ trace_tcp_rcv_established(sk, skb);
+
if (unlikely(sk->sk_rx_dst == NULL))
inet_csk(sk)->icsk_af_ops->sk_rx_dst_set(sk, skb);
/*
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 7f18262..9832512 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -41,6 +41,7 @@
#include <linux/compiler.h>
#include <linux/gfp.h>
#include <linux/module.h>
+#include <trace/events/tcp.h>
/* People can turn this off for buggy TCP's found in printers etc. */
int sysctl_tcp_retrans_collapse __read_mostly = 1;
@@ -1014,6 +1015,8 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it,
/* Our usage of tstamp should remain private */
skb->tstamp.tv64 = 0;
+ trace_tcp_transmit_skb(sk, skb);
+
/* Cleanup our debris for IP stacks */
memset(skb->cb, 0, max(sizeof(struct inet_skb_parm),
sizeof(struct inet6_skb_parm)));
--
1.8.1
--
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