mac80211: driver operation debugging

This makes mac80211 use the event tracing framework
to log all operations as given to the driver. This
will need to be extended with more information, but
as a start it should be good.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/mac80211/Kconfig

@@ -206,3 +206,15 @@ config MAC80211_DEBUG_COUNTERS
 	  and show them in debugfs.
 
 	  If unsure, say N.
+
+config MAC80211_DRIVER_API_TRACER
+	bool "Driver API tracer"
+	depends on MAC80211_DEBUG_MENU
+	depends on EVENT_TRACING
+	help
+	  Say Y here to make mac80211 register with the ftrace
+	  framework for the driver API -- you can see which
+	  driver methods it is calling then by looking at the
+	  trace.
+
+	  If unsure, say N.

net/mac80211/Makefile

@@ -41,6 +41,9 @@ mac80211-$(CONFIG_MAC80211_MESH) += \
 
 mac80211-$(CONFIG_PM) += pm.o
 
+mac80211-$(CONFIG_MAC80211_DRIVER_API_TRACER) += driver-trace.o
+CFLAGS_driver-trace.o := -I$(src)
+
 # objects for PID algorithm
 rc80211_pid-y := rc80211_pid_algo.o
 rc80211_pid-$(CONFIG_MAC80211_DEBUGFS) += rc80211_pid_debugfs.o

net/mac80211/driver-ops.h

@@ -3,6 +3,7 @@
 
 #include <net/mac80211.h>
 #include "ieee80211_i.h"
+#include "driver-trace.h"
 
 static inline int drv_tx(struct ieee80211_local *local, struct sk_buff *skb)
 {
@@ -11,29 +12,37 @@ static inline int drv_tx(struct ieee80211_local *local, struct sk_buff *skb)
 
 static inline int drv_start(struct ieee80211_local *local)
 {
-	return local->ops->start(&local->hw);
+	int ret = local->ops->start(&local->hw);
+	trace_drv_start(local, ret);
+	return ret;
 }
 
 static inline void drv_stop(struct ieee80211_local *local)
 {
 	local->ops->stop(&local->hw);
+	trace_drv_stop(local);
 }
 
 static inline int drv_add_interface(struct ieee80211_local *local,
 				    struct ieee80211_if_init_conf *conf)
 {
-	return local->ops->add_interface(&local->hw, conf);
+	int ret = local->ops->add_interface(&local->hw, conf);
+	trace_drv_add_interface(local, conf->mac_addr, conf->vif, ret);
+	return ret;
 }
 
 static inline void drv_remove_interface(struct ieee80211_local *local,
 					struct ieee80211_if_init_conf *conf)
 {
 	local->ops->remove_interface(&local->hw, conf);
+	trace_drv_remove_interface(local, conf->mac_addr, conf->vif);
 }
 
 static inline int drv_config(struct ieee80211_local *local, u32 changed)
 {
-	return local->ops->config(&local->hw, changed);
+	int ret = local->ops->config(&local->hw, changed);
+	trace_drv_config(local, changed, ret);
+	return ret;
 }
 
 static inline void drv_bss_info_changed(struct ieee80211_local *local,
@@ -43,6 +52,7 @@ static inline void drv_bss_info_changed(struct ieee80211_local *local,
 {
 	if (local->ops->bss_info_changed)
 		local->ops->bss_info_changed(&local->hw, vif, info, changed);
+	trace_drv_bss_info_changed(local, vif, info, changed);
 }
 
 static inline void drv_configure_filter(struct ieee80211_local *local,
@@ -53,14 +63,18 @@ static inline void drv_configure_filter(struct ieee80211_local *local,
 {
 	local->ops->configure_filter(&local->hw, changed_flags, total_flags,
 				     mc_count, mc_list);
+	trace_drv_configure_filter(local, changed_flags, total_flags,
+					    mc_count);
 }
 
 static inline int drv_set_tim(struct ieee80211_local *local,
 			      struct ieee80211_sta *sta, bool set)
 {
+	int ret = 0;
 	if (local->ops->set_tim)
-		return local->ops->set_tim(&local->hw, sta, set);
-	return 0;
+		ret = local->ops->set_tim(&local->hw, sta, set);
+	trace_drv_set_tim(local, sta, set, ret);
+	return ret;
 }
 
 static inline int drv_set_key(struct ieee80211_local *local,
@@ -68,7 +82,9 @@ static inline int drv_set_key(struct ieee80211_local *local,
 			      struct ieee80211_sta *sta,
 			      struct ieee80211_key_conf *key)
 {
-	return local->ops->set_key(&local->hw, cmd, vif, sta, key);
+	int ret = local->ops->set_key(&local->hw, cmd, vif, sta, key);
+	trace_drv_set_key(local, cmd, vif, sta, key, ret);
+	return ret;
 }
 
 static inline void drv_update_tkip_key(struct ieee80211_local *local,
@@ -79,32 +95,41 @@ static inline void drv_update_tkip_key(struct ieee80211_local *local,
 	if (local->ops->update_tkip_key)
 		local->ops->update_tkip_key(&local->hw, conf, address,
 					    iv32, phase1key);
+	trace_drv_update_tkip_key(local, conf, address, iv32);
 }
 
 static inline int drv_hw_scan(struct ieee80211_local *local,
 			      struct cfg80211_scan_request *req)
 {
-	return local->ops->hw_scan(&local->hw, req);
+	int ret = local->ops->hw_scan(&local->hw, req);
+	trace_drv_hw_scan(local, req, ret);
+	return ret;
 }
 
 static inline void drv_sw_scan_start(struct ieee80211_local *local)
 {
 	if (local->ops->sw_scan_start)
 		local->ops->sw_scan_start(&local->hw);
+	trace_drv_sw_scan_start(local);
 }
 
 static inline void drv_sw_scan_complete(struct ieee80211_local *local)
 {
 	if (local->ops->sw_scan_complete)
 		local->ops->sw_scan_complete(&local->hw);
+	trace_drv_sw_scan_complete(local);
 }
 
 static inline int drv_get_stats(struct ieee80211_local *local,
 				struct ieee80211_low_level_stats *stats)
 {
-	if (!local->ops->get_stats)
-		return -EOPNOTSUPP;
-	return local->ops->get_stats(&local->hw, stats);
+	int ret = -EOPNOTSUPP;
+
+	if (local->ops->get_stats)
+		ret = local->ops->get_stats(&local->hw, stats);
+	trace_drv_get_stats(local, stats, ret);
+
+	return ret;
 }
 
 static inline void drv_get_tkip_seq(struct ieee80211_local *local,
@@ -112,14 +137,17 @@ static inline void drv_get_tkip_seq(struct ieee80211_local *local,
 {
 	if (local->ops->get_tkip_seq)
 		local->ops->get_tkip_seq(&local->hw, hw_key_idx, iv32, iv16);
+	trace_drv_get_tkip_seq(local, hw_key_idx, iv32, iv16);
 }
 
 static inline int drv_set_rts_threshold(struct ieee80211_local *local,
 					u32 value)
 {
+	int ret = 0;
 	if (local->ops->set_rts_threshold)
-		return local->ops->set_rts_threshold(&local->hw, value);
-	return 0;
+		ret = local->ops->set_rts_threshold(&local->hw, value);
+	trace_drv_set_rts_threshold(local, value, ret);
+	return ret;
 }
 
 static inline void drv_sta_notify(struct ieee80211_local *local,
@@ -129,46 +157,57 @@ static inline void drv_sta_notify(struct ieee80211_local *local,
 {
 	if (local->ops->sta_notify)
 		local->ops->sta_notify(&local->hw, vif, cmd, sta);
+	trace_drv_sta_notify(local, vif, cmd, sta);
 }
 
 static inline int drv_conf_tx(struct ieee80211_local *local, u16 queue,
 			      const struct ieee80211_tx_queue_params *params)
 {
+	int ret = -EOPNOTSUPP;
 	if (local->ops->conf_tx)
-		return local->ops->conf_tx(&local->hw, queue, params);
-	return -EOPNOTSUPP;
+		ret = local->ops->conf_tx(&local->hw, queue, params);
+	trace_drv_conf_tx(local, queue, params, ret);
+	return ret;
 }
 
 static inline int drv_get_tx_stats(struct ieee80211_local *local,
 				   struct ieee80211_tx_queue_stats *stats)
 {
-	return local->ops->get_tx_stats(&local->hw, stats);
+	int ret = local->ops->get_tx_stats(&local->hw, stats);
+	trace_drv_get_tx_stats(local, stats, ret);
+	return ret;
 }
 
 static inline u64 drv_get_tsf(struct ieee80211_local *local)
 {
+	u64 ret = -1ULL;
 	if (local->ops->get_tsf)
-		return local->ops->get_tsf(&local->hw);
-	return -1ULL;
+		ret = local->ops->get_tsf(&local->hw);
+	trace_drv_get_tsf(local, ret);
+	return ret;
 }
 
 static inline void drv_set_tsf(struct ieee80211_local *local, u64 tsf)
 {
 	if (local->ops->set_tsf)
 		local->ops->set_tsf(&local->hw, tsf);
+	trace_drv_set_tsf(local, tsf);
 }
 
 static inline void drv_reset_tsf(struct ieee80211_local *local)
 {
 	if (local->ops->reset_tsf)
 		local->ops->reset_tsf(&local->hw);
+	trace_drv_reset_tsf(local);
 }
 
 static inline int drv_tx_last_beacon(struct ieee80211_local *local)
 {
+	int ret = 1;
 	if (local->ops->tx_last_beacon)
-		return local->ops->tx_last_beacon(&local->hw);
-	return 1;
+		ret = local->ops->tx_last_beacon(&local->hw);
+	trace_drv_tx_last_beacon(local, ret);
+	return ret;
 }
 
 static inline int drv_ampdu_action(struct ieee80211_local *local,
@@ -176,10 +215,12 @@ static inline int drv_ampdu_action(struct ieee80211_local *local,
 				   struct ieee80211_sta *sta, u16 tid,
 				   u16 *ssn)
 {
+	int ret = -EOPNOTSUPP;
 	if (local->ops->ampdu_action)
-		return local->ops->ampdu_action(&local->hw, action,
+		ret = local->ops->ampdu_action(&local->hw, action,
 					       sta, tid, ssn);
-	return -EOPNOTSUPP;
+	trace_drv_ampdu_action(local, action, sta, tid, ssn, ret);
+	return ret;
 }
 
 

net/mac80211/driver-trace.c

+/* bug in tracepoint.h, it should include this */
+#include <linux/module.h>
+
+#include "driver-ops.h"
+#define CREATE_TRACE_POINTS
+#include "driver-trace.h"