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authorJohannes Berg <johannes.berg@intel.com>2010-11-24 02:10:06 -0500
committerJohn W. Linville <linville@tuxdriver.com>2010-11-24 16:19:36 -0500
commit99ba2a14283be96a682e04455061c08a46bbf4ec (patch)
tree120520c075528d7ef5a32bb8782c82b7c7e972eb /net/mac80211/status.c
parentc063dbf52b998b852122dff07a8b8dd430b38437 (diff)
mac80211: implement packet loss notification
For drivers that have accurate TX status reporting we can report the number of consecutive lost packets to userspace using the new cfg80211 CQM event. The threshold is fixed right now, this may need to be improved in the future. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211/status.c')
-rw-r--r--net/mac80211/status.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/net/mac80211/status.c b/net/mac80211/status.c
index 8695cd11dfd9..bed7e32ed908 100644
--- a/net/mac80211/status.c
+++ b/net/mac80211/status.c
@@ -161,6 +161,15 @@ static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb)
161 ieee80211_sta_tx_notify(sdata, (void *) skb->data); 161 ieee80211_sta_tx_notify(sdata, (void *) skb->data);
162} 162}
163 163
164/*
165 * Use a static threshold for now, best value to be determined
166 * by testing ...
167 * Should it depend on:
168 * - on # of retransmissions
169 * - current throughput (higher value for higher tpt)?
170 */
171#define STA_LOST_PKT_THRESHOLD 50
172
164void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb) 173void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
165{ 174{
166 struct sk_buff *skb2; 175 struct sk_buff *skb2;
@@ -247,6 +256,19 @@ void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
247 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && 256 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) &&
248 (info->flags & IEEE80211_TX_STAT_ACK)) 257 (info->flags & IEEE80211_TX_STAT_ACK))
249 ieee80211_frame_acked(sta, skb); 258 ieee80211_frame_acked(sta, skb);
259
260 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
261 if (info->flags & IEEE80211_TX_STAT_ACK) {
262 if (sta->lost_packets)
263 sta->lost_packets = 0;
264 } else if (++sta->lost_packets >= STA_LOST_PKT_THRESHOLD) {
265 cfg80211_cqm_pktloss_notify(sta->sdata->dev,
266 sta->sta.addr,
267 sta->lost_packets,
268 GFP_ATOMIC);
269 sta->lost_packets = 0;
270 }
271 }
250 } 272 }
251 273
252 rcu_read_unlock(); 274 rcu_read_unlock();