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net: tracepoint: replace tcp_set_state tracepoint with inet_sock_set_state tracepoint

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As sk_state is a common field for struct sock, so the state
transition tracepoint should not be a TCP specific feature.
Currently it traces all AF_INET state transition, so I rename this
tracepoint to inet_sock_set_state tracepoint with some minor changes and move it
into trace/events/sock.h.
We dont need to create a file named trace/events/inet_sock.h for this one single
tracepoint.

Two helpers are introduced to trace sk_state transition
    - void inet_sk_state_store(struct sock *sk, int newstate);
    - void inet_sk_set_state(struct sock *sk, int state);
As trace header should not be included in other header files,
so they are defined in sock.c.

The protocol such as SCTP maybe compiled as a ko, hence export
inet_sk_set_state().

Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yafang Shao
2017-12-20 11:12:51 +08:00
committed by David S. Miller
parent d7b850a7de
commit 563e0bb0dc
7 changed files with 128 additions and 40 deletions
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31
include/trace/events/tcp.h
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@@ -9,37 +9,6 @@
#include <linux/tracepoint.h>
#include <net/ipv6.h>
#define tcp_state_names \
EM(TCP_ESTABLISHED) \
EM(TCP_SYN_SENT) \
EM(TCP_SYN_RECV) \
EM(TCP_FIN_WAIT1) \
EM(TCP_FIN_WAIT2) \
EM(TCP_TIME_WAIT) \
EM(TCP_CLOSE) \
EM(TCP_CLOSE_WAIT) \
EM(TCP_LAST_ACK) \
EM(TCP_LISTEN) \
EM(TCP_CLOSING) \
EMe(TCP_NEW_SYN_RECV) \
/* enums need to be exported to user space */
#undef EM
#undef EMe
#define EM(a) TRACE_DEFINE_ENUM(a);
#define EMe(a) TRACE_DEFINE_ENUM(a);
tcp_state_names
#undef EM
#undef EMe
#define EM(a) tcp_state_name(a),
#define EMe(a) tcp_state_name(a)
#define tcp_state_name(state) { state, #state }
#define show_tcp_state_name(val) \
__print_symbolic(val, tcp_state_names)
/*
* tcp event with arguments sk and skb
*