{mac|nl}80211: Add station connected time

Add station connected time in debugfs. This will be helpful to get a
measure of stability of the connection and for debugging stress issues

Cc: Senthilkumar Balasubramanian <Senthilkumar.Balasubramanian@Atheros.com>
Signed-off-by: Mohammed Shafi Shajakhan <mshajakhan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

include/linux/nl80211.h

@@ -1297,6 +1297,7 @@ enum nl80211_sta_bss_param {
  *	attribute, like NL80211_STA_INFO_TX_BITRATE.
  * @NL80211_STA_INFO_BSS_PARAM: current station's view of BSS, nested attribute
  *     containing info as possible, see &enum nl80211_sta_bss_param
+ * @NL80211_STA_INFO_CONNECTED_TIME: time since the station is last connected
  * @__NL80211_STA_INFO_AFTER_LAST: internal
  * @NL80211_STA_INFO_MAX: highest possible station info attribute
  */
@@ -1317,6 +1318,7 @@ enum nl80211_sta_info {
 	NL80211_STA_INFO_SIGNAL_AVG,
 	NL80211_STA_INFO_RX_BITRATE,
 	NL80211_STA_INFO_BSS_PARAM,
+	NL80211_STA_INFO_CONNECTED_TIME,
 
 	/* keep last */
 	__NL80211_STA_INFO_AFTER_LAST,

include/net/cfg80211.h

@@ -423,6 +423,7 @@ struct station_parameters {
  * @STATION_INFO_SIGNAL_AVG: @signal_avg filled
  * @STATION_INFO_RX_BITRATE: @rxrate fields are filled
  * @STATION_INFO_BSS_PARAM: @bss_param filled
+ * @STATION_INFO_CONNECTED_TIME: @connected_time filled
  */
 enum station_info_flags {
 	STATION_INFO_INACTIVE_TIME	= 1<<0,
@@ -441,6 +442,7 @@ enum station_info_flags {
 	STATION_INFO_SIGNAL_AVG		= 1<<13,
 	STATION_INFO_RX_BITRATE		= 1<<14,
 	STATION_INFO_BSS_PARAM          = 1<<15,
+	STATION_INFO_CONNECTED_TIME	= 1<<16
 };
 
 /**
@@ -511,6 +513,7 @@ struct sta_bss_parameters {
  * Station information filled by driver for get_station() and dump_station.
  *
  * @filled: bitflag of flags from &enum station_info_flags
+ * @connected_time: time(in secs) since a station is last connected
  * @inactive_time: time since last station activity (tx/rx) in milliseconds
  * @rx_bytes: bytes received from this station
  * @tx_bytes: bytes transmitted to this station
@@ -533,6 +536,7 @@ struct sta_bss_parameters {
  */
 struct station_info {
 	u32 filled;
+	u32 connected_time;
 	u32 inactive_time;
 	u32 rx_bytes;
 	u32 tx_bytes;

net/mac80211/cfg.c

@@ -330,6 +330,7 @@ static void rate_idx_to_bitrate(struct rate_info *rate, struct sta_info *sta, in
 static void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo)
 {
 	struct ieee80211_sub_if_data *sdata = sta->sdata;
+	struct timespec uptime;
 
 	sinfo->generation = sdata->local->sta_generation;
 
@@ -343,7 +344,11 @@ static void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo)
 			STATION_INFO_TX_BITRATE |
 			STATION_INFO_RX_BITRATE |
 			STATION_INFO_RX_DROP_MISC |
-			STATION_INFO_BSS_PARAM;
+			STATION_INFO_BSS_PARAM |
+			STATION_INFO_CONNECTED_TIME;
+
+	do_posix_clock_monotonic_gettime(&uptime);
+	sinfo->connected_time = uptime.tv_sec - sta->last_connected;
 
 	sinfo->inactive_time = jiffies_to_msecs(jiffies - sta->last_rx);
 	sinfo->rx_bytes = sta->rx_bytes;

net/mac80211/debugfs_sta.c

@@ -92,6 +92,31 @@ static ssize_t sta_inactive_ms_read(struct file *file, char __user *userbuf,
 }
 STA_OPS(inactive_ms);
 
+
+static ssize_t sta_connected_time_read(struct file *file, char __user *userbuf,
+					size_t count, loff_t *ppos)
+{
+	struct sta_info *sta = file->private_data;
+	struct timespec uptime;
+	struct tm result;
+	long connected_time_secs;
+	char buf[100];
+	int res;
+	do_posix_clock_monotonic_gettime(&uptime);
+	connected_time_secs = uptime.tv_sec - sta->last_connected;
+	time_to_tm(connected_time_secs, 0, &result);
+	result.tm_year -= 70;
+	result.tm_mday -= 1;
+	res = scnprintf(buf, sizeof(buf),
+		"years  - %d\nmonths - %d\ndays   - %d\nclock  - %d:%d:%d\n\n",
+			result.tm_year, result.tm_mon, result.tm_mday,
+			result.tm_hour, result.tm_min, result.tm_sec);
+	return simple_read_from_buffer(userbuf, count, ppos, buf, res);
+}
+STA_OPS(connected_time);
+
+
+
 static ssize_t sta_last_seq_ctrl_read(struct file *file, char __user *userbuf,
 				      size_t count, loff_t *ppos)
 {
@@ -324,6 +349,7 @@ void ieee80211_sta_debugfs_add(struct sta_info *sta)
 	DEBUGFS_ADD(flags);
 	DEBUGFS_ADD(num_ps_buf_frames);
 	DEBUGFS_ADD(inactive_ms);
+	DEBUGFS_ADD(connected_time);
 	DEBUGFS_ADD(last_seq_ctrl);
 	DEBUGFS_ADD(agg_status);
 	DEBUGFS_ADD(dev);

net/mac80211/sta_info.c

@@ -228,6 +228,7 @@ struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
 {
 	struct ieee80211_local *local = sdata->local;
 	struct sta_info *sta;
+	struct timespec uptime;
 	int i;
 
 	sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
@@ -245,6 +246,8 @@ struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
 	sta->sdata = sdata;
 	sta->last_rx = jiffies;
 
+	do_posix_clock_monotonic_gettime(&uptime);
+	sta->last_connected = uptime.tv_sec;
 	ewma_init(&sta->avg_signal, 1024, 8);
 
 	if (sta_prepare_rate_control(local, sta, gfp)) {

net/mac80211/sta_info.h

@@ -226,6 +226,7 @@ enum plink_state {
  * @rx_bytes: Number of bytes received from this STA
  * @wep_weak_iv_count: number of weak WEP IVs received from this station
  * @last_rx: time (in jiffies) when last frame was received from this STA
+ * @last_connected: time (in seconds) when a station got connected
  * @num_duplicates: number of duplicate frames received from this STA
  * @rx_fragments: number of received MPDUs
  * @rx_dropped: number of dropped MPDUs from this STA
@@ -295,6 +296,7 @@ struct sta_info {
 	unsigned long rx_packets, rx_bytes;
 	unsigned long wep_weak_iv_count;
 	unsigned long last_rx;
+	long last_connected;
 	unsigned long num_duplicates;
 	unsigned long rx_fragments;
 	unsigned long rx_dropped;

net/wireless/nl80211.c

@@ -2020,6 +2020,9 @@ static int nl80211_send_station(struct sk_buff *msg, u32 pid, u32 seq,
 	sinfoattr = nla_nest_start(msg, NL80211_ATTR_STA_INFO);
 	if (!sinfoattr)
 		goto nla_put_failure;
+	if (sinfo->filled & STATION_INFO_CONNECTED_TIME)
+		NLA_PUT_U32(msg, NL80211_STA_INFO_CONNECTED_TIME,
+			    sinfo->connected_time);
 	if (sinfo->filled & STATION_INFO_INACTIVE_TIME)
 		NLA_PUT_U32(msg, NL80211_STA_INFO_INACTIVE_TIME,
 			    sinfo->inactive_time);