[][MAC80211][core][mt76][Airtime Fairness Scheduler Feature Off]
[Description]
Change Airtime Fairness Scheduler feature
mac80211: airtime_flags depends on NL80211_EXT_FEATURE_AIRTIME_FAIRNESS
mt76: Airtime Fairness Scheduler feature disbale
MAC80211 provides three Fairness Componments (ATF/AQL/AQM)
To fit with Mediatek WiFi6 Feature, will default disable ATF scheduler.
The airtime info is registered by mt76 which reads it from WTBL and
MAC80211 grant permission based on a historical average of airtime usage.
When ATF on, packets per station is unbalance a split second and
cause firmware algorithm hard to send HEMU PPDUs.
[Release-log]
N/A
Change-Id: I95cb3796fc18f1e91ad957015d5f8a25bb6da691
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/5936675
diff --git a/autobuild_mac80211_release/package/kernel/mt76/patches/1114-mt76-mt7915-drop-packetes-when-TWT-stations-use-more.patch b/autobuild_mac80211_release/package/kernel/mt76/patches/1114-mt76-mt7915-drop-packetes-when-TWT-stations-use-more.patch
new file mode 100644
index 0000000..1785a61
--- /dev/null
+++ b/autobuild_mac80211_release/package/kernel/mt76/patches/1114-mt76-mt7915-drop-packetes-when-TWT-stations-use-more.patch
@@ -0,0 +1,98 @@
+From bbfc52d9e15334a0e72884754be04b8df335de39 Mon Sep 17 00:00:00 2001
+From: Evelyn Tsai <evelyn.tsai@mediatek.com>
+Date: Fri, 6 May 2022 15:53:07 +0800
+Subject: [PATCH 1114/1116] mt76: mt7915: drop packetes when TWT stations use
+ more token then 128
+
+---
+ mt7915/mac.c | 21 ++++++++++++++++++---
+ mt7915/mt7915.h | 2 ++
+ 2 files changed, 20 insertions(+), 3 deletions(-)
+
+diff --git a/mt7915/mac.c b/mt7915/mac.c
+index b899697c..1935acff 100644
+--- a/mt7915/mac.c
++++ b/mt7915/mac.c
+@@ -1303,6 +1303,7 @@ int mt7915_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr,
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx_info->skb);
+ struct ieee80211_key_conf *key = info->control.hw_key;
+ struct ieee80211_vif *vif = info->control.vif;
++ struct mt7915_sta *msta = NULL;
+ struct mt76_txwi_cache *t;
+ struct mt7915_txp *txp;
+ int id, i, nbuf = tx_info->nbuf - 1;
+@@ -1316,8 +1317,6 @@ int mt7915_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr,
+ wcid = &dev->mt76.global_wcid;
+
+ if (sta) {
+- struct mt7915_sta *msta;
+-
+ msta = (struct mt7915_sta *)sta->drv_priv;
+
+ if (time_after(jiffies, msta->jiffies + HZ / 4)) {
+@@ -1329,10 +1328,22 @@ int mt7915_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr,
+ t = (struct mt76_txwi_cache *)(txwi + mdev->drv->txwi_size);
+ t->skb = tx_info->skb;
+
++ spin_lock_bh(&mdev->token_lock);
++ if (msta && msta->twt.flowid_mask && msta->token_count > 128) {
++ spin_unlock_bh(&mdev->token_lock);
++ return -1;
++ }
++ spin_unlock_bh(&mdev->token_lock);
++
+ id = mt76_token_consume(mdev, &t);
+ if (id < 0)
+ return id;
+
++ spin_lock_bh(&mdev->token_lock);
++ if (msta)
++ msta->token_count++;
++ spin_unlock_bh(&mdev->token_lock);
++
+ pid = mt76_tx_status_skb_add(mdev, wcid, tx_info->skb);
+ mt7915_mac_write_txwi(dev, txwi_ptr, tx_info->skb, wcid, pid, key,
+ false);
+@@ -1524,6 +1535,7 @@ mt7915_mac_tx_free(struct mt7915_dev *dev, void *data, int len)
+ struct mt76_dev *mdev = &dev->mt76;
+ struct mt76_txwi_cache *txwi;
+ struct ieee80211_sta *sta = NULL;
++ struct mt7915_sta *msta;
+ LIST_HEAD(free_list);
+ void *end = data + len;
+ bool v3, wake = false;
+@@ -1547,7 +1559,6 @@ mt7915_mac_tx_free(struct mt7915_dev *dev, void *data, int len)
+ * 1'b0: msdu_id with the same 'wcid pair' as above.
+ */
+ if (info & MT_TX_FREE_PAIR) {
+- struct mt7915_sta *msta;
+ struct mt76_wcid *wcid;
+ u16 idx;
+
+@@ -1583,6 +1594,10 @@ mt7915_mac_tx_free(struct mt7915_dev *dev, void *data, int len)
+ txwi = mt76_token_release(mdev, msdu, &wake);
+ if (!txwi)
+ continue;
++ spin_lock(&mdev->token_lock);
++ if (msta)
++ msta->token_count--;
++ spin_unlock(&mdev->token_lock);
+
+ mt7915_txwi_free(dev, txwi, sta, &free_list);
+ }
+diff --git a/mt7915/mt7915.h b/mt7915/mt7915.h
+index 24276da5..0feccb17 100644
+--- a/mt7915/mt7915.h
++++ b/mt7915/mt7915.h
+@@ -136,6 +136,8 @@ struct mt7915_sta {
+ u8 flowid_mask;
+ struct mt7915_twt_flow flow[MT7915_MAX_STA_TWT_AGRT];
+ } twt;
++
++ int token_count;
+ };
+
+ struct mt7915_vif_cap {
+--
+2.18.0
+