SUNRPC: Replace dprintk call sites in TCP state change callouts

Report TCP socket state changes and accept failures via
tracepoints, replacing dprintk() call sites.

No tracepoint is added in svc_tcp_listen_data_ready. There's
no information available there that isn't also reported by the
svcsock_new_socket and the accept failure tracepoints.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

1 files changed, 67 insertions, 0 deletions

diff --git a/include/trace/events/sunrpc.h b/include/trace/events/sunrpc.h
index bf086640b14a..ed8c991d4f04 100644
--- a/include/trace/events/sunrpc.h
+++ b/include/trace/events/sunrpc.h
@@ -1481,6 +1481,73 @@ DEFINE_SVCSOCK_EVENT(tcp_send);
 DEFINE_SVCSOCK_EVENT(data_ready);
 DEFINE_SVCSOCK_EVENT(write_space);
 
+TRACE_EVENT(svcsock_tcp_state,
+	TP_PROTO(
+		const struct svc_xprt *xprt,
+		const struct socket *socket
+	),
+
+	TP_ARGS(xprt, socket),
+
+	TP_STRUCT__entry(
+		__field(unsigned long, socket_state)
+		__field(unsigned long, sock_state)
+		__field(unsigned long, flags)
+		__string(addr, xprt->xpt_remotebuf)
+	),
+
+	TP_fast_assign(
+		__entry->socket_state = socket->state;
+		__entry->sock_state = socket->sk->sk_state;
+		__entry->flags = xprt->xpt_flags;
+		__assign_str(addr, xprt->xpt_remotebuf);
+	),
+
+	TP_printk("addr=%s state=%s sk_state=%s flags=%s", __get_str(addr),
+		rpc_show_socket_state(__entry->socket_state),
+		rpc_show_sock_state(__entry->sock_state),
+		show_svc_xprt_flags(__entry->flags)
+	)
+);
+
+DECLARE_EVENT_CLASS(svcsock_accept_class,
+	TP_PROTO(
+		const struct svc_xprt *xprt,
+		const char *service,
+		long status
+	),
+
+	TP_ARGS(xprt, service, status),
+
+	TP_STRUCT__entry(
+		__field(long, status)
+		__string(service, service)
+		__array(unsigned char, addr, sizeof(struct sockaddr_in6))
+	),
+
+	TP_fast_assign(
+		__entry->status = status;
+		__assign_str(service, service);
+		memcpy(__entry->addr, &xprt->xpt_local, sizeof(__entry->addr));
+	),
+
+	TP_printk("listener=%pISpc service=%s status=%ld",
+		__entry->addr, __get_str(service), __entry->status
+	)
+);
+
+#define DEFINE_ACCEPT_EVENT(name) \
+	DEFINE_EVENT(svcsock_accept_class, svcsock_##name##_err, \
+			TP_PROTO( \
+				const struct svc_xprt *xprt, \
+				const char *service, \
+				long status \
+			), \
+			TP_ARGS(xprt, service, status))
+
+DEFINE_ACCEPT_EVENT(accept);
+DEFINE_ACCEPT_EVENT(getpeername);
+
 DECLARE_EVENT_CLASS(cache_event,
 	TP_PROTO(
 		const struct cache_detail *cd,