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[PATCH 3/4 V2] mac80211: add last beacon time in scan list

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From: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx>

This patch adds the interval between the scan results and the last time a
beacon was received in the result of the scan.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx>
Signed-off-by: Tomas Winkler <tomas.winkler@xxxxxxxxx>
---
 net/mac80211/mlme.c |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 7b930d1..e76e62a 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -4658,12 +4658,26 @@ ieee80211_sta_scan_result(struct net_device *dev,
 		char *buf;
 		buf = kmalloc(30, GFP_ATOMIC);
 		if (buf) {
+			unsigned long mid_range = (-1) / 2 + 1;
+			unsigned long time_diff;
+
 			memset(&iwe, 0, sizeof(iwe));
 			iwe.cmd = IWEVCUSTOM;
 			sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp));
 			iwe.u.data.length = strlen(buf);
 			current_ev = iwe_stream_add_point(current_ev, end_buf,
 							  &iwe, buf);
+			memset(&iwe, 0, sizeof(iwe));
+
+			iwe.cmd = IWEVCUSTOM;
+			time_diff = jiffies - bss->last_update > mid_range ?
+				jiffies - bss->last_update :
+				bss->last_update - jiffies;
+			sprintf(buf, "Last beacon:%dms ago",
+				jiffies_to_msecs(time_diff));
+			iwe.u.data.length = strlen(buf);
+			current_ev = iwe_stream_add_point(current_ev, end_buf,
+							  &iwe, buf);
 			kfree(buf);
 		}
 	}
-- 
1.5.4.1

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Intel Israel (74) Limited

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