From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steven Rostedt Subject: [PATCH] tcp: Export to userspace the TCP state names for the trace events Date: Thu, 9 Nov 2017 19:57:12 -0500 Message-ID: <20171109195712.47fe23b6@gandalf.local.home> References: <1510207298-14828-1-git-send-email-laoar.shao@gmail.com> <20171109064326.skfvvohg7qhgl3lp@ast-mbp> <20171109131808.373c296f@gandalf.local.home> <30A95900-7378-439F-954E-BD5487012435@fb.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: Song Liu , Alexei Starovoitov , Yafang Shao , "mingo@redhat.com" , "netdev@vger.kernel.org" , "linux-kernel@vger.kernel.org" To: David Miller Return-path: In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org From: "Steven Rostedt (VMware)" The TCP trace events (specifically tcp_set_state), maps emums to symbol names via __print_symbolic(). But this only works for reading trace events from the tracefs trace files. If perf or trace-cmd were to record these events, the event format file does not convert the enum names into numbers, and you get something like: __print_symbolic(REC->oldstate, { TCP_ESTABLISHED, "TCP_ESTABLISHED" }, { TCP_SYN_SENT, "TCP_SYN_SENT" }, { TCP_SYN_RECV, "TCP_SYN_RECV" }, { TCP_FIN_WAIT1, "TCP_FIN_WAIT1" }, { TCP_FIN_WAIT2, "TCP_FIN_WAIT2" }, { TCP_TIME_WAIT, "TCP_TIME_WAIT" }, { TCP_CLOSE, "TCP_CLOSE" }, { TCP_CLOSE_WAIT, "TCP_CLOSE_WAIT" }, { TCP_LAST_ACK, "TCP_LAST_ACK" }, { TCP_LISTEN, "TCP_LISTEN" }, { TCP_CLOSING, "TCP_CLOSING" }, { TCP_NEW_SYN_RECV, "TCP_NEW_SYN_RECV" }) Where trace-cmd and perf do not know the values of those enums. Use the TRACE_DEFINE_ENUM() macros that will have the trace events convert the enum strings into their values at system boot. This will allow perf and trace-cmd to see actual numbers and not enums: __print_symbolic(REC->oldstate, { 1, "TCP_ESTABLISHED" }, { 2, "TCP_SYN_SENT" }, { 3, "TCP_SYN_RECV" }, { 4, "TCP_FIN_WAIT1" }, { 5, "TCP_FIN_WAIT2" }, { 6, "TCP_TIME_WAIT" }, { 7, "TCP_CLOSE" }, { 8, "TCP_CLOSE_WAIT" }, { 9, "TCP_LAST_ACK" }, { 10, "TCP_LISTEN" }, { 11, "TCP_CLOSING" }, { 12, "TCP_NEW_SYN_RECV" }) Signed-off-by: Steven Rostedt (VMware) --- include/trace/events/tcp.h | 41 ++++++++++++++++++++++++++++------------- 1 file changed, 28 insertions(+), 13 deletions(-) diff --git a/include/trace/events/tcp.h b/include/trace/events/tcp.h index 07cccca6cbf1..62e5bad7901f 100644 --- a/include/trace/events/tcp.h +++ b/include/trace/events/tcp.h @@ -9,21 +9,36 @@ #include #include +#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_name(TCP_ESTABLISHED), \ - tcp_state_name(TCP_SYN_SENT), \ - tcp_state_name(TCP_SYN_RECV), \ - tcp_state_name(TCP_FIN_WAIT1), \ - tcp_state_name(TCP_FIN_WAIT2), \ - tcp_state_name(TCP_TIME_WAIT), \ - tcp_state_name(TCP_CLOSE), \ - tcp_state_name(TCP_CLOSE_WAIT), \ - tcp_state_name(TCP_LAST_ACK), \ - tcp_state_name(TCP_LISTEN), \ - tcp_state_name(TCP_CLOSING), \ - tcp_state_name(TCP_NEW_SYN_RECV)) + __print_symbolic(val, tcp_state_names) /* * tcp event with arguments sk and skb -- 2.13.6