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Subject: [PATCH 3/3] SUNRPC: Add tracepoint that fires when an RPC is
 retransmitted
From:   Chuck Lever <chuck.lever@oracle.com>
To:     trondmy@hammerspace.com, anna.schumaker@netapp.com
Cc:     linux-nfs@vger.kernel.org
Date:   Wed, 31 Mar 2021 13:22:27 -0400
Message-ID: <161721134727.515091.17484770488909461673.stgit@manet.1015granger.net>
In-Reply-To: <161721133412.515091.3634995666026759187.stgit@manet.1015granger.net>
References: <161721133412.515091.3634995666026759187.stgit@manet.1015granger.net>
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Precedence: bulk

A separate tracepoint can be left enabled all the time to capture
rare but important retransmission events. So for example:

kworker/u26:3-568   [009]   156.967933: xprt_retransmit:      task:44093@5 xid=0xa25dbc79 nfsv3 WRITE ntrans=2

Or, for example, enable all nfs and nfs4 tracepoints, and set up a
trigger to disable tracing when xprt_retransmit fires to capture
everything that leads up to it.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 include/trace/events/sunrpc.h |   40 ++++++++++++++++++++++++++++++++++++++++
 net/sunrpc/xprt.c             |    4 +++-
 2 files changed, 43 insertions(+), 1 deletion(-)

diff --git a/include/trace/events/sunrpc.h b/include/trace/events/sunrpc.h
index 690988530d60..8e68268e2a98 100644
--- a/include/trace/events/sunrpc.h
+++ b/include/trace/events/sunrpc.h
@@ -1079,6 +1079,46 @@ TRACE_EVENT(xprt_transmit,
 		__entry->seqno, __entry->status)
 );
 
+TRACE_EVENT(xprt_retransmit,
+	TP_PROTO(
+		const struct rpc_rqst *rqst
+	),
+
+	TP_ARGS(rqst),
+
+	TP_STRUCT__entry(
+		__field(unsigned int, task_id)
+		__field(unsigned int, client_id)
+		__field(u32, xid)
+		__field(int, ntrans)
+		__field(int, version)
+		__string(progname,
+			 rqst->rq_task->tk_client->cl_program->name)
+		__string(procedure,
+			 rqst->rq_task->tk_msg.rpc_proc->p_name)
+	),
+
+	TP_fast_assign(
+		struct rpc_task *task = rqst->rq_task;
+
+		__entry->task_id = task->tk_pid;
+		__entry->client_id = task->tk_client ?
+			task->tk_client->cl_clid : -1;
+		__entry->xid = be32_to_cpu(rqst->rq_xid);
+		__entry->ntrans = rqst->rq_ntrans;
+		__assign_str(progname,
+			     task->tk_client->cl_program->name)
+		__entry->version = task->tk_client->cl_vers;
+		__assign_str(procedure, task->tk_msg.rpc_proc->p_name)
+	),
+
+	TP_printk(
+		"task:%u@%u xid=0x%08x %sv%d %s ntrans=%d",
+		__entry->task_id, __entry->client_id, __entry->xid,
+		__get_str(progname), __entry->version, __get_str(procedure),
+		__entry->ntrans)
+);
+
 TRACE_EVENT(xprt_ping,
 	TP_PROTO(const struct rpc_xprt *xprt, int status),
 
diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c
index b694af4504c4..fcdb17666d2d 100644
--- a/net/sunrpc/xprt.c
+++ b/net/sunrpc/xprt.c
@@ -1540,8 +1540,10 @@ xprt_request_transmit(struct rpc_rqst *req, struct rpc_task *snd_task)
 		return status;
 	}
 
-	if (is_retrans)
+	if (is_retrans) {
 		task->tk_client->cl_stats->rpcretrans++;
+		trace_xprt_retransmit(req);
+	}
 
 	xprt_inject_disconnect(xprt);