devlink: add hardware messages tracing facility

#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

#include <net/net_namespace.h>

#include <net/net_namespace.h>

#include <net/sock.h>

#include <net/sock.h>

#include <net/devlink.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);

static LIST_HEAD(devlink_list);