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authorFelix Fietkau <nbd@openwrt.org>2014-05-23 20:05:28 +0200
committerJohannes Berg <johannes.berg@intel.com>2014-05-28 16:22:48 +0200
commitabd43a6a68b2f69821eef3daf789242b262ba2c0 (patch)
tree727522f4ce78e2f36af5a3e97fc7ef6bbca05629 /net
parent923eaf367206e01f22c97aee22300e332d071916 (diff)
mac80211: reduce packet loss notifications under load
During strong signal fluctuations under high throughput, few consecutive failed A-MPDU transmissions can easily trigger packet loss notification, and thus (in AP mode) client disconnection. Reduce the number of false positives by checking the A-MPDU status flag and treating a failed A-MPDU as a single packet. Signed-off-by: Felix Fietkau <nbd@openwrt.org> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net')
-rw-r--r--net/mac80211/status.c25
1 files changed, 19 insertions, 6 deletions
diff --git a/net/mac80211/status.c b/net/mac80211/status.c
index e6e574a307c8..bfa5326776ab 100644
--- a/net/mac80211/status.c
+++ b/net/mac80211/status.c
@@ -542,6 +542,23 @@ static void ieee80211_tx_latency_end_msrmnt(struct ieee80211_local *local,
*/
#define STA_LOST_PKT_THRESHOLD 50
+static void ieee80211_lost_packet(struct sta_info *sta, struct sk_buff *skb)
+{
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+
+ /* This packet was aggregated but doesn't carry status info */
+ if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
+ !(info->flags & IEEE80211_TX_STAT_AMPDU))
+ return;
+
+ if (++sta->lost_packets < STA_LOST_PKT_THRESHOLD)
+ return;
+
+ cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
+ sta->lost_packets, GFP_ATOMIC);
+ sta->lost_packets = 0;
+}
+
void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
{
struct sk_buff *skb2;
@@ -680,12 +697,8 @@ void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
if (info->flags & IEEE80211_TX_STAT_ACK) {
if (sta->lost_packets)
sta->lost_packets = 0;
- } else if (++sta->lost_packets >= STA_LOST_PKT_THRESHOLD) {
- cfg80211_cqm_pktloss_notify(sta->sdata->dev,
- sta->sta.addr,
- sta->lost_packets,
- GFP_ATOMIC);
- sta->lost_packets = 0;
+ } else {
+ ieee80211_lost_packet(sta, skb);
}
}