Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753176AbdLEONA (ORCPT ); Tue, 5 Dec 2017 09:13:00 -0500 Received: from mail-pf0-f193.google.com ([209.85.192.193]:37430 "EHLO mail-pf0-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752608AbdLEOM4 (ORCPT ); Tue, 5 Dec 2017 09:12:56 -0500 X-Google-Smtp-Source: AGs4zMZI/U160PVCb+0K5caQ9eA5Kqc02wSaomXVoZt64DL8Vll9ltlw5K31Smpv71IdE98e5owbgg== From: Yafang Shao To: davem@davemloft.net, songliubraving@fb.com, marcelo.leitner@gmail.com Cc: kuznet@ms2.inr.ac.ru, yoshfuji@linux-ipv6.org, rostedt@goodmis.org, bgregg@netflix.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Yafang Shao Subject: [PATCH v3 net-next] net/tcp: trace all TCP/IP state transition with tcp_set_state tracepoint Date: Tue, 5 Dec 2017 14:12:42 +0000 Message-Id: <1512483162-5557-1-git-send-email-laoar.shao@gmail.com> X-Mailer: git-send-email 1.8.3.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4443 Lines: 132 The TCP/IP transition from TCP_LISTEN to TCP_SYN_RECV and some other transitions are not traced with tcp_set_state tracepoint. In order to trace the whole tcp lifespans, two helpers are introduced, void __tcp_set_state(struct sock *sk, int state); void sk_state_store(struct sock *sk, int newstate); When do TCP/IP state transition, we should use these two helpers or use tcp_set_state() other than assigning a value to sk_state directly. Signed-off-by: Yafang Shao Acked-by: Song Liu --- v2->v3: Per suggestion from Marcelo Ricardo Leitner, inverting __ to sk_state_store. --- include/net/sock.h | 7 +++++-- include/net/tcp.h | 1 + net/ipv4/inet_connection_sock.c | 4 ++-- net/ipv4/inet_hashtables.c | 2 +- net/ipv4/tcp.c | 14 +++++++++++++- 5 files changed, 22 insertions(+), 6 deletions(-) diff --git a/include/net/sock.h b/include/net/sock.h index 79e1a2c..e89a098 100644 --- a/include/net/sock.h +++ b/include/net/sock.h @@ -2349,18 +2349,21 @@ static inline int sk_state_load(const struct sock *sk) } /** - * sk_state_store - update sk->sk_state + * __sk_state_store - update sk->sk_state * @sk: socket pointer * @newstate: new state * * Paired with sk_state_load(). Should be used in contexts where * state change might impact lockless readers. */ -static inline void sk_state_store(struct sock *sk, int newstate) +static inline void __sk_state_store(struct sock *sk, int newstate) { smp_store_release(&sk->sk_state, newstate); } +/* For tcp_set_state tracepoint */ +void sk_state_store(struct sock *sk, int newstate); + void sock_enable_timestamp(struct sock *sk, int flag); int sock_get_timestamp(struct sock *, struct timeval __user *); int sock_get_timestampns(struct sock *, struct timespec __user *); diff --git a/include/net/tcp.h b/include/net/tcp.h index 4e09398..cc43ce9 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -1247,6 +1247,7 @@ static inline bool tcp_checksum_complete(struct sk_buff *skb) "Close Wait","Last ACK","Listen","Closing" }; #endif +void __tcp_set_state(struct sock *sk, int state); void tcp_set_state(struct sock *sk, int state); void tcp_done(struct sock *sk); diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c index 4ca46dc..74523c4 100644 --- a/net/ipv4/inet_connection_sock.c +++ b/net/ipv4/inet_connection_sock.c @@ -783,7 +783,7 @@ struct sock *inet_csk_clone_lock(const struct sock *sk, if (newsk) { struct inet_connection_sock *newicsk = inet_csk(newsk); - newsk->sk_state = TCP_SYN_RECV; + __tcp_set_state(newsk, TCP_SYN_RECV); newicsk->icsk_bind_hash = NULL; inet_sk(newsk)->inet_dport = inet_rsk(req)->ir_rmt_port; @@ -888,7 +888,7 @@ int inet_csk_listen_start(struct sock *sk, int backlog) return 0; } - sk->sk_state = TCP_CLOSE; + __tcp_set_state(sk, TCP_CLOSE); return err; } EXPORT_SYMBOL_GPL(inet_csk_listen_start); diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c index f6f5810..b24cc12 100644 --- a/net/ipv4/inet_hashtables.c +++ b/net/ipv4/inet_hashtables.c @@ -544,7 +544,7 @@ bool inet_ehash_nolisten(struct sock *sk, struct sock *osk) sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); } else { percpu_counter_inc(sk->sk_prot->orphan_count); - sk->sk_state = TCP_CLOSE; + __tcp_set_state(sk, TCP_CLOSE); sock_set_flag(sk, SOCK_DEAD); inet_csk_destroy_sock(sk); } diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 1803116..4ade887 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -2036,6 +2036,18 @@ int tcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock, } EXPORT_SYMBOL(tcp_recvmsg); +void sk_state_store(struct sock *sk, int newstate) +{ + trace_tcp_set_state(sk, sk->sk_state, newstate); + __sk_state_store(sk, newstate); +} + +void __tcp_set_state(struct sock *sk, int state) +{ + trace_tcp_set_state(sk, sk->sk_state, state); + sk->sk_state = state; +} + void tcp_set_state(struct sock *sk, int state) { int oldstate = sk->sk_state; @@ -2065,7 +2077,7 @@ void tcp_set_state(struct sock *sk, int state) /* Change state AFTER socket is unhashed to avoid closed * socket sitting in hash tables. */ - sk_state_store(sk, state); + __sk_state_store(sk, state); #ifdef STATE_TRACE SOCK_DEBUG(sk, "TCP sk=%p, State %s -> %s\n", sk, statename[oldstate], statename[state]); -- 1.8.3.1