rxrpc: Add a tracepoint to follow packets in the Rx buffer

Add a tracepoint to follow the life of packets that get added to a call's
receive buffer.

Signed-off-by: David Howells <dhowells@redhat.com>
diff --git a/net/rxrpc/misc.c b/net/rxrpc/misc.c
index dca8999..db5f1d5 100644
--- a/net/rxrpc/misc.c
+++ b/net/rxrpc/misc.c
@@ -141,3 +141,12 @@
 	[rxrpc_transmit_rotate]		= "ROT",
 	[rxrpc_transmit_end]		= "END",
 };
+
+const char rxrpc_receive_traces[rxrpc_receive__nr_trace][4] = {
+	[rxrpc_receive_incoming]	= "INC",
+	[rxrpc_receive_queue]		= "QUE",
+	[rxrpc_receive_queue_last]	= "QLS",
+	[rxrpc_receive_front]		= "FRN",
+	[rxrpc_receive_rotate]		= "ROT",
+	[rxrpc_receive_end]		= "END",
+};