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Date:   Sun,  3 Mar 2019 10:57:30 +0200
From:   Eran Ben Elisha <eranbe@...lanox.com>
To:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>
Cc:     Saeed Mahameed <saeedm@...lanox.com>,
        Jiri Pirko <jiri@...lanox.com>,
        Eran Ben Elisha <eranbe@...lanox.com>
Subject: [PATCH net-next 2/3] devlink: Add support for direct reporter health state update

It is possible that a reporter state will be updated due to a recover flow
which is not triggered by a devlink health related operation, but as a side
effect of some other operation in the system.

Expose devlink health API for a direct update of a reporter status.

Move devlink_health_reporter_state enum definition to devlink.h so it could
be used from drivers as a parameter of devlink_health_reporter_state_update.

In addition, add trace_devlink_health_reporter_state_update to provide user
notification for reporter state change.

Signed-off-by: Eran Ben Elisha <eranbe@...lanox.com>
Acked-by: Jiri Pirko <jiri@...lanox.com>
---
 include/net/devlink.h          | 14 ++++++++++++++
 include/trace/events/devlink.h | 31 +++++++++++++++++++++++++++++++
 net/core/devlink.c             | 22 +++++++++++++++++-----
 3 files changed, 62 insertions(+), 5 deletions(-)

diff --git a/include/net/devlink.h b/include/net/devlink.h
index 7f5a0bdca228..63de99e09f04 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -447,6 +447,11 @@ typedef void devlink_snapshot_data_dest_t(const void *data);
 struct devlink_fmsg;
 struct devlink_health_reporter;
 
+enum devlink_health_reporter_state {
+	DEVLINK_HEALTH_REPORTER_STATE_HEALTHY,
+	DEVLINK_HEALTH_REPORTER_STATE_ERROR,
+};
+
 /**
  * struct devlink_health_reporter_ops - Reporter operations
  * @name: reporter name
@@ -715,6 +720,9 @@ void *
 devlink_health_reporter_priv(struct devlink_health_reporter *reporter);
 int devlink_health_report(struct devlink_health_reporter *reporter,
 			  const char *msg, void *priv_ctx);
+void
+devlink_health_reporter_state_update(struct devlink_health_reporter *reporter,
+				     enum devlink_health_reporter_state state);
 
 void devlink_compat_running_version(struct net_device *dev,
 				    char *buf, size_t len);
@@ -1204,6 +1212,12 @@ devlink_health_report(struct devlink_health_reporter *reporter,
 	return 0;
 }
 
+static inline void
+devlink_health_reporter_state_update(struct devlink_health_reporter *reporter,
+				     enum devlink_health_reporter_state state)
+{
+}
+
 static inline void
 devlink_compat_running_version(struct net_device *dev, char *buf, size_t len)
 {
diff --git a/include/trace/events/devlink.h b/include/trace/events/devlink.h
index 191ddf67d769..6f60a78d9a7e 100644
--- a/include/trace/events/devlink.h
+++ b/include/trace/events/devlink.h
@@ -140,6 +140,37 @@ TRACE_EVENT(devlink_health_recover_aborted,
 		  __entry->time_since_last_recover)
 );
 
+/*
+ * Tracepoint for devlink health reporter state update:
+ */
+TRACE_EVENT(devlink_health_reporter_state_update,
+	TP_PROTO(const struct devlink *devlink, const char *reporter_name,
+		 bool new_state),
+
+	TP_ARGS(devlink, reporter_name, new_state),
+
+	TP_STRUCT__entry(
+		__string(bus_name, devlink->dev->bus->name)
+		__string(dev_name, dev_name(devlink->dev))
+		__string(driver_name, devlink->dev->driver->name)
+		__string(reporter_name, reporter_name)
+		__field(u8, new_state)
+	),
+
+	TP_fast_assign(
+		__assign_str(bus_name, devlink->dev->bus->name);
+		__assign_str(dev_name, dev_name(devlink->dev));
+		__assign_str(driver_name, devlink->dev->driver->name);
+		__assign_str(reporter_name, reporter_name);
+		__entry->new_state = new_state;
+	),
+
+	TP_printk("bus_name=%s dev_name=%s driver_name=%s reporter_name=%s: new_state=%d",
+		  __get_str(bus_name), __get_str(dev_name),
+		  __get_str(driver_name), __get_str(reporter_name),
+		  __entry->new_state)
+);
+
 #endif /* _TRACE_DEVLINK_H */
 
 /* This part must be outside protection */
diff --git a/net/core/devlink.c b/net/core/devlink.c
index 376e01a70c6d..78e22cea4cc7 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -4409,11 +4409,6 @@ struct devlink_health_reporter {
 	u64 last_recovery_ts;
 };
 
-enum devlink_health_reporter_state {
-	DEVLINK_HEALTH_REPORTER_STATE_HEALTHY,
-	DEVLINK_HEALTH_REPORTER_STATE_ERROR,
-};
-
 void *
 devlink_health_reporter_priv(struct devlink_health_reporter *reporter)
 {
@@ -4498,6 +4493,23 @@ devlink_health_reporter_destroy(struct devlink_health_reporter *reporter)
 }
 EXPORT_SYMBOL_GPL(devlink_health_reporter_destroy);
 
+void
+devlink_health_reporter_state_update(struct devlink_health_reporter *reporter,
+				     enum devlink_health_reporter_state state)
+{
+	if (WARN_ON(state != DEVLINK_HEALTH_REPORTER_STATE_HEALTHY &&
+		    state != DEVLINK_HEALTH_REPORTER_STATE_ERROR))
+		return;
+
+	if (reporter->health_state == state)
+		return;
+
+	reporter->health_state = state;
+	trace_devlink_health_reporter_state_update(reporter->devlink,
+						   reporter->ops->name, state);
+}
+EXPORT_SYMBOL_GPL(devlink_health_reporter_state_update);
+
 static int
 devlink_health_reporter_recover(struct devlink_health_reporter *reporter,
 				void *priv_ctx)
-- 
2.17.1

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