[PATCH v1 06/15] SUNRPC: Add tracepoint to rpc_call_rpcerror()

[Chuck Lever <chuck.lever@xxxxxxxxxx>]

Add a tracepoint in another common exit point for failing RPCs.

Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
 include/trace/events/sunrpc.h |   28 ++++++++++++++++++++++++++++
 net/sunrpc/clnt.c             |    1 +
 2 files changed, 29 insertions(+)

diff --git a/include/trace/events/sunrpc.h b/include/trace/events/sunrpc.h
index f6896bcfd97f..f1fd3fae5b0f 100644
--- a/include/trace/events/sunrpc.h
+++ b/include/trace/events/sunrpc.h
@@ -365,6 +365,34 @@
 DEFINE_RPC_REPLY_EVENT(bad_creds);
 DEFINE_RPC_REPLY_EVENT(auth_tooweak);
 
+TRACE_EVENT(rpc_call_rpcerror,
+	TP_PROTO(
+		const struct rpc_task *task,
+		int tk_status,
+		int rpc_status
+	),
+
+	TP_ARGS(task, tk_status, rpc_status),
+
+	TP_STRUCT__entry(
+		__field(unsigned int, task_id)
+		__field(unsigned int, client_id)
+		__field(int, tk_status)
+		__field(int, rpc_status)
+	),
+
+	TP_fast_assign(
+		__entry->client_id = task->tk_client->cl_clid;
+		__entry->task_id = task->tk_pid;
+		__entry->tk_status = tk_status;
+		__entry->rpc_status = rpc_status;
+	),
+
+	TP_printk("task:%u@%u tk_status=%d rpc_status=%d",
+		__entry->task_id, __entry->client_id,
+		__entry->tk_status, __entry->rpc_status)
+);
+
 TRACE_EVENT(rpc_stats_latency,
 
 	TP_PROTO(
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index 456e64ca14bc..9151ade01a55 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -1624,6 +1624,7 @@ void rpc_force_rebind(struct rpc_clnt *clnt)
 static void
 __rpc_call_rpcerror(struct rpc_task *task, int tk_status, int rpc_status)
 {
+	trace_rpc_call_rpcerror(task, tk_status, rpc_status);
 	task->tk_rpc_status = rpc_status;
 	rpc_exit(task, tk_status);
 }