rxrpc: Add a tracepoint to track rxrpc_local refcounting

Add a tracepoint to track reference counting on the rxrpc_local struct.

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

3 files changed, 68 insertions, 27 deletions

diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index 2a2b0fdfb157..cc51d3eb0548 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -981,31 +981,12 @@ extern void rxrpc_process_local_events(struct rxrpc_local *);
  * local_object.c
  */
 struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *);
-void __rxrpc_put_local(struct rxrpc_local *);
+struct rxrpc_local *rxrpc_get_local(struct rxrpc_local *);
+struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *);
+void rxrpc_put_local(struct rxrpc_local *);
+void rxrpc_queue_local(struct rxrpc_local *);
 void rxrpc_destroy_all_locals(struct rxrpc_net *);
 
-static inline void rxrpc_get_local(struct rxrpc_local *local)
-{
-	atomic_inc(&local->usage);
-}
-
-static inline
-struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *local)
-{
-	return atomic_inc_not_zero(&local->usage) ? local : NULL;
-}
-
-static inline void rxrpc_put_local(struct rxrpc_local *local)
-{
-	if (local && atomic_dec_and_test(&local->usage))
-		__rxrpc_put_local(local);
-}
-
-static inline void rxrpc_queue_local(struct rxrpc_local *local)
-{
-	rxrpc_queue_work(&local->processor);
-}
-
 /*
  * misc.c
  */
diff --git a/net/rxrpc/call_accept.c b/net/rxrpc/call_accept.c
index 493545033e42..5a9b1d916124 100644
--- a/net/rxrpc/call_accept.c
+++ b/net/rxrpc/call_accept.c
@@ -296,8 +296,7 @@ static struct rxrpc_call *rxrpc_alloc_incoming_call(struct rxrpc_sock *rx,
 		b->conn_backlog[conn_tail] = NULL;
 		smp_store_release(&b->conn_backlog_tail,
 				  (conn_tail + 1) & (RXRPC_BACKLOG_MAX - 1));
-		rxrpc_get_local(local);
-		conn->params.local = local;
+		conn->params.local = rxrpc_get_local(local);
 		conn->params.peer = peer;
 		rxrpc_see_connection(conn);
 		rxrpc_new_incoming_connection(rx, conn, skb);
diff --git a/net/rxrpc/local_object.c b/net/rxrpc/local_object.c
index 38b99db30e54..8b54e9531d52 100644
--- a/net/rxrpc/local_object.c
+++ b/net/rxrpc/local_object.c
@@ -95,6 +95,7 @@ static struct rxrpc_local *rxrpc_alloc_local(struct rxrpc_net *rxnet,
 		local->debug_id = atomic_inc_return(&rxrpc_debug_id);
 		memcpy(&local->srx, srx, sizeof(*srx));
 		local->srx.srx_service = 0;
+		trace_rxrpc_local(local, rxrpc_local_new, 1, NULL);
 	}
 
 	_leave(" = %p", local);
@@ -257,15 +258,74 @@ addr_in_use:
 }
 
 /*
+ * Get a ref on a local endpoint.
+ */
+struct rxrpc_local *rxrpc_get_local(struct rxrpc_local *local)
+{
+	const void *here = __builtin_return_address(0);
+	int n;
+
+	n = atomic_inc_return(&local->usage);
+	trace_rxrpc_local(local, rxrpc_local_got, n, here);
+	return local;
+}
+
+/*
+ * Get a ref on a local endpoint unless its usage has already reached 0.
+ */
+struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *local)
+{
+	const void *here = __builtin_return_address(0);
+
+	if (local) {
+		int n = __atomic_add_unless(&local->usage, 1, 0);
+		if (n > 0)
+			trace_rxrpc_local(local, rxrpc_local_got, n + 1, here);
+		else
+			local = NULL;
+	}
+	return local;
+}
+
+/*
+ * Queue a local endpoint.
+ */
+void rxrpc_queue_local(struct rxrpc_local *local)
+{
+	const void *here = __builtin_return_address(0);
+
+	if (rxrpc_queue_work(&local->processor))
+		trace_rxrpc_local(local, rxrpc_local_queued,
+				  atomic_read(&local->usage), here);
+}
+
+/*
  * A local endpoint reached its end of life.
  */
-void __rxrpc_put_local(struct rxrpc_local *local)
+static void __rxrpc_put_local(struct rxrpc_local *local)
 {
 	_enter("%d", local->debug_id);
 	rxrpc_queue_work(&local->processor);
 }
 
 /*
+ * Drop a ref on a local endpoint.
+ */
+void rxrpc_put_local(struct rxrpc_local *local)
+{
+	const void *here = __builtin_return_address(0);
+	int n;
+
+	if (local) {
+		n = atomic_dec_return(&local->usage);
+		trace_rxrpc_local(local, rxrpc_local_put, n, here);
+
+		if (n == 0)
+			__rxrpc_put_local(local);
+	}
+}
+
+/*
  * Destroy a local endpoint's socket and then hand the record to RCU to dispose
  * of.
  *
@@ -322,7 +382,8 @@ static void rxrpc_local_processor(struct work_struct *work)
 		container_of(work, struct rxrpc_local, processor);
 	bool again;
 
-	_enter("%d", local->debug_id);
+	trace_rxrpc_local(local, rxrpc_local_processing,
+			  atomic_read(&local->usage), NULL);
 
 	do {
 		again = false;