netdev - [PATCH net-next 07/10] rxrpc: Trace socket notification

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Date:   Wed, 01 Aug 2018 13:59:30 +0100
From:   David Howells <dhowells@...hat.com>
To:     netdev@...r.kernel.org
Cc:     dhowells@...hat.com, linux-afs@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH net-next 07/10] rxrpc: Trace socket notification

Trace notifications from the softirq side of the socket to the
process-context side.

Signed-off-by: David Howells <dhowells@...hat.com>
---

 include/trace/events/rxrpc.h |   20 ++++++++++++++++++++
 net/rxrpc/input.c            |    4 +++-
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/include/trace/events/rxrpc.h b/include/trace/events/rxrpc.h
index c1a800a6dee3..196587b8f204 100644
--- a/include/trace/events/rxrpc.h
+++ b/include/trace/events/rxrpc.h
@@ -1528,6 +1528,26 @@ TRACE_EVENT(rxrpc_call_reset,
 		      __entry->tx_seq, __entry->rx_seq)
 	    );
 
+TRACE_EVENT(rxrpc_notify_socket,
+	    TP_PROTO(unsigned int debug_id, rxrpc_serial_t serial),
+
+	    TP_ARGS(debug_id, serial),
+
+	    TP_STRUCT__entry(
+		    __field(unsigned int,		debug_id	)
+		    __field(rxrpc_serial_t,		serial		)
+			     ),
+
+	    TP_fast_assign(
+		    __entry->debug_id = debug_id;
+		    __entry->serial = serial;
+			   ),
+
+	    TP_printk("c=%08x r=%08x",
+		      __entry->debug_id,
+		      __entry->serial)
+	    );
+
 #endif /* _TRACE_RXRPC_H */
 
 /* This part must be outside protection */
diff --git a/net/rxrpc/input.c b/net/rxrpc/input.c
index 8989d760b6b2..cfdc199c6351 100644
--- a/net/rxrpc/input.c
+++ b/net/rxrpc/input.c
@@ -597,8 +597,10 @@ static void rxrpc_input_data(struct rxrpc_call *call, struct sk_buff *skb,
 				  false, true,
 				  rxrpc_propose_ack_input_data);
 
-	if (sp->hdr.seq == READ_ONCE(call->rx_hard_ack) + 1)
+	if (sp->hdr.seq == READ_ONCE(call->rx_hard_ack) + 1) {
+		trace_rxrpc_notify_socket(call->debug_id, serial);
 		rxrpc_notify_socket(call);
+	}
 	_leave(" [queued]");
 }