mptcp: add tracepoint in get_mapping_status

This patch added a tracepoint in the mapping status function
get_mapping_status() to dump every mpext field.
Suggested-by: Paolo Abeni <pabeni@redhat.com>
Acked-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/trace/events/mptcp.h

@@ -54,6 +54,58 @@ TRACE_EVENT(mptcp_subflow_get_send,
 		  __entry->backup, __entry->ratio)
 );
 
+DECLARE_EVENT_CLASS(mptcp_dump_mpext,
+
+	TP_PROTO(struct mptcp_ext *mpext),
+
+	TP_ARGS(mpext),
+
+	TP_STRUCT__entry(
+		__field(u64, data_ack)
+		__field(u64, data_seq)
+		__field(u32, subflow_seq)
+		__field(u16, data_len)
+		__field(u8, use_map)
+		__field(u8, dsn64)
+		__field(u8, data_fin)
+		__field(u8, use_ack)
+		__field(u8, ack64)
+		__field(u8, mpc_map)
+		__field(u8, frozen)
+		__field(u8, reset_transient)
+		__field(u8, reset_reason)
+	),
+
+	TP_fast_assign(
+		__entry->data_ack = mpext->ack64 ? mpext->data_ack : mpext->data_ack32;
+		__entry->data_seq = mpext->data_seq;
+		__entry->subflow_seq = mpext->subflow_seq;
+		__entry->data_len = mpext->data_len;
+		__entry->use_map = mpext->use_map;
+		__entry->dsn64 = mpext->dsn64;
+		__entry->data_fin = mpext->data_fin;
+		__entry->use_ack = mpext->use_ack;
+		__entry->ack64 = mpext->ack64;
+		__entry->mpc_map = mpext->mpc_map;
+		__entry->frozen = mpext->frozen;
+		__entry->reset_transient = mpext->reset_transient;
+		__entry->reset_reason = mpext->reset_reason;
+	),
+
+	TP_printk("data_ack=%llu data_seq=%llu subflow_seq=%u data_len=%u use_map=%u dsn64=%u data_fin=%u use_ack=%u ack64=%u mpc_map=%u frozen=%u reset_transient=%u reset_reason=%u",
+		  __entry->data_ack, __entry->data_seq,
+		  __entry->subflow_seq, __entry->data_len,
+		  __entry->use_map, __entry->dsn64,
+		  __entry->data_fin, __entry->use_ack,
+		  __entry->ack64, __entry->mpc_map,
+		  __entry->frozen, __entry->reset_transient,
+		  __entry->reset_reason)
+);
+
+DEFINE_EVENT(mptcp_dump_mpext, get_mapping_status,
+	TP_PROTO(struct mptcp_ext *mpext),
+	TP_ARGS(mpext));
+
 #endif /* _TRACE_MPTCP_H */
 
 /* This part must be outside protection */

net/mptcp/subflow.c

@@ -25,6 +25,8 @@
 #include "protocol.h"
 #include "mib.h"
 
+#include <trace/events/mptcp.h>
+
 static void mptcp_subflow_ops_undo_override(struct sock *ssk);
 
 static void SUBFLOW_REQ_INC_STATS(struct request_sock *req,
@@ -862,9 +864,7 @@ static enum mapping_status get_mapping_status(struct sock *ssk,
 		goto validate_seq;
 	}
 
-	pr_debug("seq=%llu is64=%d ssn=%u data_len=%u data_fin=%d",
-		 mpext->data_seq, mpext->dsn64, mpext->subflow_seq,
-		 mpext->data_len, mpext->data_fin);
+	trace_get_mapping_status(mpext);
 
 	data_len = mpext->data_len;
 	if (data_len == 0) {