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From:   greearb@candelatech.com
To:     linux-wireless@vger.kernel.org
Cc:     johannes@sipsolutions.net, Ben Greear <greearb@candelatech.com>
Subject: [PATCH 1/2] wireless: Support assoc-at timer in sta-info
Date:   Fri,  9 Aug 2019 10:46:55 -0700
Message-Id: <20190809174656.20872-1-greearb@candelatech.com>
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From: Ben Greear <greearb@candelatech.com>

Report time stamp of when sta became associated.

This is the boottime clock, units are nano-seconds.

Signed-off-by: Ben Greear <greearb@candelatech.com>
---

This attempts to implement the associated-at timestamp reporting
with boottime stamp instead of wall-clock, as suggested.

 include/net/cfg80211.h       | 2 ++
 include/uapi/linux/nl80211.h | 2 ++
 net/wireless/nl80211.c       | 1 +
 3 files changed, 5 insertions(+)

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index ef510c916635..19c200b917eb 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1306,6 +1306,7 @@ struct cfg80211_tid_stats {
  *	indicate the relevant values in this struct for them
  * @connected_time: time(in secs) since a station is last connected
  * @inactive_time: time since last station activity (tx/rx) in milliseconds
+ * @assoc_at: bootime (ns) of the last association
  * @rx_bytes: bytes (size of MPDUs) received from this station
  * @tx_bytes: bytes (size of MPDUs) transmitted to this station
  * @llid: mesh local link id
@@ -1366,6 +1367,7 @@ struct station_info {
 	u64 filled;
 	u32 connected_time;
 	u32 inactive_time;
+	u64 assoc_at;
 	u64 rx_bytes;
 	u64 tx_bytes;
 	u16 llid;
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 76d5811193be..3796e1e06665 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -3175,6 +3175,7 @@ enum nl80211_sta_bss_param {
  *	sent to the station (u64, usec)
  * @NL80211_STA_INFO_AIRTIME_WEIGHT: current airtime weight for station (u16)
  * @NL80211_STA_INFO_AIRTIME_LINK_METRIC: airtime link metric for mesh station
+ * @NL80211_STA_INFO_ASSOC_AT_BOOTTIME: Timestamp of last association
  * @__NL80211_STA_INFO_AFTER_LAST: internal
  * @NL80211_STA_INFO_MAX: highest possible station info attribute
  */
@@ -3221,6 +3222,7 @@ enum nl80211_sta_info {
 	NL80211_STA_INFO_TX_DURATION,
 	NL80211_STA_INFO_AIRTIME_WEIGHT,
 	NL80211_STA_INFO_AIRTIME_LINK_METRIC,
+	NL80211_STA_INFO_ASSOC_AT_BOOTTIME,
 
 	/* keep last */
 	__NL80211_STA_INFO_AFTER_LAST,
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 789cd98f02f5..b61a59b9d78b 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -5028,6 +5028,7 @@ static int nl80211_send_station(struct sk_buff *msg, u32 cmd, u32 portid,
 
 	PUT_SINFO(CONNECTED_TIME, connected_time, u32);
 	PUT_SINFO(INACTIVE_TIME, inactive_time, u32);
+	PUT_SINFO_U64(ASSOC_AT_BOOTTIME, assoc_at);
 
 	if (sinfo->filled & (BIT_ULL(NL80211_STA_INFO_RX_BYTES) |
 			     BIT_ULL(NL80211_STA_INFO_RX_BYTES64)) &&
-- 
2.20.1