mac80211: retry sending failed BAR frames later instead of tearing down aggr
Unfortunately failed BAR tx attempts happen more frequently than I
expected, and the resulting aggregation teardowns cause performance
issues, as the aggregation session does not always get re-established
properly.
Instead of tearing down the entire aggr session, we can simply store the
SSN of the last failed BAR tx attempt, wait for the first successful
tx status event, and then send another BAR with the same SSN.
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Cc: Helmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/status.c b/net/mac80211/status.c
index e51bd2a..ba405bc 100644
--- a/net/mac80211/status.c
+++ b/net/mac80211/status.c
@@ -127,12 +127,32 @@
dev_kfree_skb(skb);
}
+static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid)
+{
+ struct tid_ampdu_tx *tid_tx;
+
+ tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
+ if (!tid_tx || !tid_tx->bar_pending)
+ return;
+
+ tid_tx->bar_pending = false;
+ ieee80211_send_bar(sta->sdata, addr, tid, tid_tx->failed_bar_ssn);
+}
+
static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb)
{
struct ieee80211_mgmt *mgmt = (void *) skb->data;
struct ieee80211_local *local = sta->local;
struct ieee80211_sub_if_data *sdata = sta->sdata;
+ if (ieee80211_is_data_qos(mgmt->frame_control)) {
+ struct ieee80211_hdr *hdr = (void *) skb->data;
+ u8 *qc = ieee80211_get_qos_ctl(hdr);
+ u16 tid = qc[0] & 0xf;
+
+ ieee80211_check_pending_bar(sta, hdr->addr1, tid);
+ }
+
if (ieee80211_is_action(mgmt->frame_control) &&
sdata->vif.type == NL80211_IFTYPE_STATION &&
mgmt->u.action.category == WLAN_CATEGORY_HT &&
@@ -161,6 +181,18 @@
}
}
+static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn)
+{
+ struct tid_ampdu_tx *tid_tx;
+
+ tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
+ if (!tid_tx)
+ return;
+
+ tid_tx->failed_bar_ssn = ssn;
+ tid_tx->bar_pending = true;
+}
+
/*
* Use a static threshold for now, best value to be determined
* by testing ...
@@ -254,10 +286,13 @@
*/
bar = (struct ieee80211_bar *) skb->data;
if (!(bar->control & IEEE80211_BAR_CTRL_MULTI_TID)) {
+ u16 ssn = le16_to_cpu(bar->start_seq_num);
+
tid = (bar->control &
IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
- ieee80211_stop_tx_ba_session(&sta->sta, tid);
+
+ ieee80211_set_bar_pending(sta, tid, ssn);
}
}