rxrpc: Improve the call tracking tracepoint

Improve the call tracking tracepoint by showing more differentiation
between some of the put and get events, including:

  (1) Getting and putting refs for the socket call user ID tree.

  (2) Getting and putting refs for queueing and failing to queue the call
      processor work item.

Note that these aren't necessarily used in this patch, but will be taken
advantage of in future patches.

An enum is added for the event subtype numbers rather than coding them
directly as decimal numbers and a table of 3-letter strings is provided
rather than a sequence of ?: operators.

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

1 files changed, 20 insertions, 2 deletions

diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index ad702f9f8d1f..913255a53564 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -508,6 +508,24 @@ struct rxrpc_call {
 	unsigned long		ackr_window[RXRPC_ACKR_WINDOW_ASZ + 1];
 };
 
+enum rxrpc_call_trace {
+	rxrpc_call_new_client,
+	rxrpc_call_new_service,
+	rxrpc_call_queued,
+	rxrpc_call_queued_ref,
+	rxrpc_call_seen,
+	rxrpc_call_got,
+	rxrpc_call_got_skb,
+	rxrpc_call_got_userid,
+	rxrpc_call_put,
+	rxrpc_call_put_skb,
+	rxrpc_call_put_userid,
+	rxrpc_call_put_noqueue,
+	rxrpc_call__nr_trace
+};
+
+extern const char rxrpc_call_traces[rxrpc_call__nr_trace][4];
+
 #include <trace/events/rxrpc.h>
 
 /*
@@ -555,8 +573,8 @@ struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *,
 void rxrpc_release_call(struct rxrpc_call *);
 void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
 void rxrpc_see_call(struct rxrpc_call *);
-void rxrpc_get_call(struct rxrpc_call *);
-void rxrpc_put_call(struct rxrpc_call *);
+void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
+void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace);
 void rxrpc_get_call_for_skb(struct rxrpc_call *, struct sk_buff *);
 void rxrpc_put_call_for_skb(struct rxrpc_call *, struct sk_buff *);
 void __exit rxrpc_destroy_all_calls(void);