devlink: add hardware messages tracing facility

Define a tracepoint and allow user to trace messages going to and from
hardware associated with devlink instance.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/trace/events/devlink.h b/include/trace/events/devlink.h
new file mode 100644 (file)
index 0000000..333c32a
--- /dev/null
+++ b/include/trace/events/devlink.h
@@ -0,0 +1,68 @@
+#if IS_ENABLED(CONFIG_NET_DEVLINK)
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM devlink
+
+#if !defined(_TRACE_DEVLINK_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_DEVLINK_H
+
+#include <linux/device.h>
+#include <net/devlink.h>
+#include <linux/tracepoint.h>
+
+/*
+ * Tracepoint for devlink hardware message:
+ */
+TRACE_EVENT(devlink_hwmsg,
+       TP_PROTO(const struct devlink *devlink, bool incoming,
+                unsigned long type, const u8 *buf, size_t len),
+
+       TP_ARGS(devlink, incoming, type, buf, len),
+
+       TP_STRUCT__entry(
+               __string(bus_name, devlink->dev->bus->name)
+               __string(dev_name, dev_name(devlink->dev))
+               __string(owner_name, devlink->dev->driver->owner->name)
+               __field(bool, incoming)
+               __field(unsigned long, type)
+               __dynamic_array(u8, buf, len)
+               __field(size_t, len)
+       ),
+
+       TP_fast_assign(
+               __assign_str(bus_name, devlink->dev->bus->name);
+               __assign_str(dev_name, dev_name(devlink->dev));
+               __assign_str(owner_name, devlink->dev->driver->owner->name);
+               __entry->incoming = incoming;
+               __entry->type = type;
+               memcpy(__get_dynamic_array(buf), buf, len);
+               __entry->len = len;
+       ),
+
+       TP_printk("bus_name=%s dev_name=%s owner_name=%s incoming=%d type=%lu buf=0x[%*phD] len=%lu",
+                 __get_str(bus_name), __get_str(dev_name),
+                 __get_str(owner_name), __entry->incoming, __entry->type,
+                 (int) __entry->len, __get_dynamic_array(buf), __entry->len)
+);
+
+#endif /* _TRACE_DEVLINK_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
+
+#else /* CONFIG_NET_DEVLINK */
+
+#if !defined(_TRACE_DEVLINK_H)
+#define _TRACE_DEVLINK_H
+
+#include <net/devlink.h>
+
+static inline void trace_devlink_hwmsg(const struct devlink *devlink,
+                                      bool incoming, unsigned long type,
+                                      const u8 *buf, size_t len)
+{
+}
+
+#endif /* _TRACE_DEVLINK_H */
+
+#endif

diff --git a/net/core/devlink.c b/net/core/devlink.c
index b2e592a198c07736cfd03e577b4ff8e85fa3ca61..1b5063088f1a7193f7789506e95cc6dbc8ab73f0 100644 (file)
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -26,6 +26,10 @@
 #include <net/net_namespace.h>
 #include <net/sock.h>
 #include <net/devlink.h>
+#define CREATE_TRACE_POINTS
+#include <trace/events/devlink.h>
+
+EXPORT_TRACEPOINT_SYMBOL_GPL(devlink_hwmsg);
 
 static LIST_HEAD(devlink_list);