From 6ba16eefcdaa8634e1c1d70d5c31b0495c99ab02 Mon Sep 17 00:00:00 2001
From: "Steven Rostedt (Red Hat)" <rostedt@goodmis.org>
Date: Fri, 27 Mar 2015 16:53:03 -0400
Subject: SUNRPC: Export enums in tracepoints to user space

The enums used in the tracepoints for __print_symbolic() have their
names shown in the tracepoint format files. User space tools do not know
how to convert those names into their values to be able to convert the
binary data.

Use TRACE_DEFINE_ENUM() to export the enum names to their values for
userspace to do the parsing correctly.

Link: http://lkml.kernel.org/r/20150403013802.220157513@goodmis.org

Acked-by: Trond Myklebust <trond.myklebust@primarydata.com>
Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Tested-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

diff --git a/include/trace/events/sunrpc.h b/include/trace/events/sunrpc.h
index b9c1dc6..fd1a02c 100644
--- a/include/trace/events/sunrpc.h
+++ b/include/trace/events/sunrpc.h
@@ -179,27 +179,53 @@ DEFINE_EVENT(rpc_task_queued, rpc_task_wakeup,
 
 );
 
+/*
+ * First define the enums in the below macros to be exported to userspace
+ * via TRACE_DEFINE_ENUM().
+ */
+#undef EM
+#undef EMe
+#define EM(a, b)	TRACE_DEFINE_ENUM(a);
+#define EMe(a, b)	TRACE_DEFINE_ENUM(a);
+
+#define RPC_SHOW_SOCKET				\
+	EM( SS_FREE, "FREE" )			\
+	EM( SS_UNCONNECTED, "UNCONNECTED" )	\
+	EM( SS_CONNECTING, "CONNECTING," )	\
+	EM( SS_CONNECTED, "CONNECTED," )	\
+	EMe(SS_DISCONNECTING, "DISCONNECTING" )
+
 #define rpc_show_socket_state(state) \
-	__print_symbolic(state, \
-		{ SS_FREE, "FREE" }, \
-		{ SS_UNCONNECTED, "UNCONNECTED" }, \
-		{ SS_CONNECTING, "CONNECTING," }, \
-		{ SS_CONNECTED, "CONNECTED," }, \
-		{ SS_DISCONNECTING, "DISCONNECTING" })
+	__print_symbolic(state, RPC_SHOW_SOCKET)
+
+RPC_SHOW_SOCKET
+
+#define RPC_SHOW_SOCK				\
+	EM( TCP_ESTABLISHED, "ESTABLISHED" )	\
+	EM( TCP_SYN_SENT, "SYN_SENT" )		\
+	EM( TCP_SYN_RECV, "SYN_RECV" )		\
+	EM( TCP_FIN_WAIT1, "FIN_WAIT1" )	\
+	EM( TCP_FIN_WAIT2, "FIN_WAIT2" )	\
+	EM( TCP_TIME_WAIT, "TIME_WAIT" )	\
+	EM( TCP_CLOSE, "CLOSE" )		\
+	EM( TCP_CLOSE_WAIT, "CLOSE_WAIT" )	\
+	EM( TCP_LAST_ACK, "LAST_ACK" )		\
+	EM( TCP_LISTEN, "LISTEN" )		\
+	EMe( TCP_CLOSING, "CLOSING" )
 
 #define rpc_show_sock_state(state) \
-	__print_symbolic(state, \
-		{ TCP_ESTABLISHED, "ESTABLISHED" }, \
-		{ TCP_SYN_SENT, "SYN_SENT" }, \
-		{ TCP_SYN_RECV, "SYN_RECV" }, \
-		{ TCP_FIN_WAIT1, "FIN_WAIT1" }, \
-		{ TCP_FIN_WAIT2, "FIN_WAIT2" }, \
-		{ TCP_TIME_WAIT, "TIME_WAIT" }, \
-		{ TCP_CLOSE, "CLOSE" }, \
-		{ TCP_CLOSE_WAIT, "CLOSE_WAIT" }, \
-		{ TCP_LAST_ACK, "LAST_ACK" }, \
-		{ TCP_LISTEN, "LISTEN" }, \
-		{ TCP_CLOSING, "CLOSING" })
+	__print_symbolic(state, RPC_SHOW_SOCK)
+
+RPC_SHOW_SOCK
+
+/*
+ * Now redefine the EM() and EMe() macros to map the enums to the strings
+ * that will be printed in the output.
+ */
+#undef EM
+#undef EMe
+#define EM(a, b)	{a, b},
+#define EMe(a, b)	{a, b}
 
 DECLARE_EVENT_CLASS(xs_socket_event,
 
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