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From: Felix Fietkau <nbd@nbd.name>
To: linux-wireless@vger.kernel.org
Cc: johannes@sipsolutions.net
Subject: [PATCH] mac80211: reduce packet loss event false positives
Date: Sat,  8 Aug 2020 19:25:42 +0200
Message-ID: <20200808172542.41628-1-nbd@nbd.name> (raw)

When running a large number of packets per second with a high data rate
and long A-MPDUs, the packet loss threshold can be reached very quickly
when the link conditions change. This frequently shows up as spurious
disconnects.
Mitigate false positives by using a similar logic for regular stations
as the one being used for TDLS, though with a more aggressive timeout.
Packet loss events are only reported if no ACK was received for a second.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 net/mac80211/sta_info.h |  4 ++--
 net/mac80211/status.c   | 31 +++++++++++++++----------------
 2 files changed, 17 insertions(+), 18 deletions(-)

diff --git a/net/mac80211/sta_info.h b/net/mac80211/sta_info.h
index 49728047dfad..f66fcce8e6a4 100644
--- a/net/mac80211/sta_info.h
+++ b/net/mac80211/sta_info.h
@@ -522,7 +522,7 @@ struct ieee80211_sta_rx_stats {
  * @status_stats.retry_failed: # of frames that failed after retry
  * @status_stats.retry_count: # of retries attempted
  * @status_stats.lost_packets: # of lost packets
- * @status_stats.last_tdls_pkt_time: timestamp of last TDLS packet
+ * @status_stats.last_pkt_time: timestamp of last ACKed packet
  * @status_stats.msdu_retries: # of MSDU retries
  * @status_stats.msdu_failed: # of failed MSDUs
  * @status_stats.last_ack: last ack timestamp (jiffies)
@@ -595,7 +595,7 @@ struct sta_info {
 		unsigned long filtered;
 		unsigned long retry_failed, retry_count;
 		unsigned int lost_packets;
-		unsigned long last_tdls_pkt_time;
+		unsigned long last_pkt_time;
 		u64 msdu_retries[IEEE80211_NUM_TIDS + 1];
 		u64 msdu_failed[IEEE80211_NUM_TIDS + 1];
 		unsigned long last_ack;
diff --git a/net/mac80211/status.c b/net/mac80211/status.c
index cbc40b358ba2..819c4221c284 100644
--- a/net/mac80211/status.c
+++ b/net/mac80211/status.c
@@ -755,12 +755,16 @@ static void ieee80211_report_used_skb(struct ieee80211_local *local,
  *  - current throughput (higher value for higher tpt)?
  */
 #define STA_LOST_PKT_THRESHOLD	50
+#define STA_LOST_PKT_TIME	HZ		/* 1 sec since last ACK */
 #define STA_LOST_TDLS_PKT_THRESHOLD	10
 #define STA_LOST_TDLS_PKT_TIME		(10*HZ) /* 10secs since last ACK */
 
 static void ieee80211_lost_packet(struct sta_info *sta,
 				  struct ieee80211_tx_info *info)
 {
+	unsigned long pkt_time = STA_LOST_PKT_TIME;
+	unsigned int pkt_thr = STA_LOST_PKT_THRESHOLD;
+
 	/* If driver relies on its own algorithm for station kickout, skip
 	 * mac80211 packet loss mechanism.
 	 */
@@ -773,21 +777,20 @@ static void ieee80211_lost_packet(struct sta_info *sta,
 		return;
 
 	sta->status_stats.lost_packets++;
-	if (!sta->sta.tdls &&
-	    sta->status_stats.lost_packets < STA_LOST_PKT_THRESHOLD)
-		return;
+	if (sta->sta.tdls) {
+		pkt_time = STA_LOST_TDLS_PKT_TIME;
+		pkt_thr = STA_LOST_PKT_THRESHOLD;
+	}
 
 	/*
 	 * If we're in TDLS mode, make sure that all STA_LOST_TDLS_PKT_THRESHOLD
 	 * of the last packets were lost, and that no ACK was received in the
 	 * last STA_LOST_TDLS_PKT_TIME ms, before triggering the CQM packet-loss
 	 * mechanism.
+	 * For non-TDLS, use STA_LOST_PKT_THRESHOLD and STA_LOST_PKT_TIME
 	 */
-	if (sta->sta.tdls &&
-	    (sta->status_stats.lost_packets < STA_LOST_TDLS_PKT_THRESHOLD ||
-	     time_before(jiffies,
-			 sta->status_stats.last_tdls_pkt_time +
-			 STA_LOST_TDLS_PKT_TIME)))
+	if (sta->status_stats.lost_packets < pkt_thr ||
+	    !time_after(jiffies, sta->status_stats.last_pkt_time + pkt_time))
 		return;
 
 	cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
@@ -1035,9 +1038,7 @@ static void __ieee80211_tx_status(struct ieee80211_hw *hw,
 					sta->status_stats.lost_packets = 0;
 
 				/* Track when last TDLS packet was ACKed */
-				if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
-					sta->status_stats.last_tdls_pkt_time =
-						jiffies;
+				sta->status_stats.last_pkt_time = jiffies;
 			} else if (noack_success) {
 				/* nothing to do here, do not account as lost */
 			} else {
@@ -1170,9 +1171,8 @@ void ieee80211_tx_status_ext(struct ieee80211_hw *hw,
 			if (sta->status_stats.lost_packets)
 				sta->status_stats.lost_packets = 0;
 
-			/* Track when last TDLS packet was ACKed */
-			if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
-				sta->status_stats.last_tdls_pkt_time = jiffies;
+			/* Track when last packet was ACKed */
+			sta->status_stats.last_pkt_time = jiffies;
 		} else if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
 			return;
 		} else if (noack_success) {
@@ -1261,8 +1261,7 @@ void ieee80211_tx_status_8023(struct ieee80211_hw *hw,
 			if (sta->status_stats.lost_packets)
 				sta->status_stats.lost_packets = 0;
 
-			if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
-				sta->status_stats.last_tdls_pkt_time = jiffies;
+			sta->status_stats.last_pkt_time = jiffies;
 		} else {
 			ieee80211_lost_packet(sta, info);
 		}
-- 
2.28.0


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