mac80211: improve rate control performance

Call rate control handler after intermediate queueuing

Signed-off-by: Felix Fietkau <nbd@nbd.name>

1 files changed, 114 insertions, 0 deletions

diff --git a/package/kernel/mac80211/patches/subsys/374-mac80211-call-ieee80211_tx_h_rate_ctrl-when-dequeue.patch b/package/kernel/mac80211/patches/subsys/374-mac80211-call-ieee80211_tx_h_rate_ctrl-when-dequeue.patch
new file mode 100644
index 0000000000..49b1212213
--- /dev/null
+++ b/package/kernel/mac80211/patches/subsys/374-mac80211-call-ieee80211_tx_h_rate_ctrl-when-dequeue.patch
@@ -0,0 +1,114 @@
+From: Ryder Lee <ryder.lee@mediatek.com>
+Date: Fri, 28 May 2021 14:05:41 +0800
+Subject: [PATCH] mac80211: call ieee80211_tx_h_rate_ctrl() when dequeue
+
+Make ieee80211_tx_h_rate_ctrl() get called on dequeue to improve
+performance since it reduces the turnaround time for rate control.
+
+Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
+---
+
+--- a/net/mac80211/tx.c
++++ b/net/mac80211/tx.c
+@@ -1780,8 +1780,6 @@ static int invoke_tx_handlers_early(stru
+ 	CALL_TXH(ieee80211_tx_h_ps_buf);
+ 	CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
+ 	CALL_TXH(ieee80211_tx_h_select_key);
+-	if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
+-		CALL_TXH(ieee80211_tx_h_rate_ctrl);
+ 
+  txh_done:
+ 	if (unlikely(res == TX_DROP)) {
+@@ -1814,6 +1812,9 @@ static int invoke_tx_handlers_late(struc
+ 		goto txh_done;
+ 	}
+ 
++	if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
++		CALL_TXH(ieee80211_tx_h_rate_ctrl);
++
+ 	CALL_TXH(ieee80211_tx_h_michael_mic_add);
+ 	CALL_TXH(ieee80211_tx_h_sequence);
+ 	CALL_TXH(ieee80211_tx_h_fragment);
+@@ -3384,15 +3385,21 @@ out:
+  * Can be called while the sta lock is held. Anything that can cause packets to
+  * be generated will cause deadlock!
+  */
+-static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata,
+-				       struct sta_info *sta, u8 pn_offs,
+-				       struct ieee80211_key *key,
+-				       struct sk_buff *skb)
++static ieee80211_tx_result
++ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata,
++			   struct sta_info *sta, u8 pn_offs,
++			   struct ieee80211_key *key,
++			   struct ieee80211_tx_data *tx)
+ {
++	struct sk_buff *skb = tx->skb;
+ 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+ 	struct ieee80211_hdr *hdr = (void *)skb->data;
+ 	u8 tid = IEEE80211_NUM_TIDS;
+ 
++	if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) &&
++	    ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE)
++		return TX_DROP;
++
+ 	if (key)
+ 		info->control.hw_key = &key->conf;
+ 
+@@ -3441,6 +3448,8 @@ static void ieee80211_xmit_fast_finish(s
+ 			break;
+ 		}
+ 	}
++
++	return TX_CONTINUE;
+ }
+ 
+ static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
+@@ -3544,24 +3553,17 @@ static bool ieee80211_xmit_fast(struct i
+ 	tx.sta = sta;
+ 	tx.key = fast_tx->key;
+ 
+-	if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
+-		tx.skb = skb;
+-		r = ieee80211_tx_h_rate_ctrl(&tx);
+-		skb = tx.skb;
+-		tx.skb = NULL;
+-
+-		if (r != TX_CONTINUE) {
+-			if (r != TX_QUEUED)
+-				kfree_skb(skb);
+-			return true;
+-		}
+-	}
+-
+ 	if (ieee80211_queue_skb(local, sdata, sta, skb))
+ 		return true;
+ 
+-	ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs,
+-				   fast_tx->key, skb);
++	tx.skb = skb;
++	r = ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs,
++				       fast_tx->key, &tx);
++	tx.skb = NULL;
++	if (r == TX_DROP) {
++		kfree_skb(skb);
++		return true;
++	}
+ 
+ 	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
+ 		sdata = container_of(sdata->bss,
+@@ -3672,8 +3674,12 @@ begin:
+ 		    (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))
+ 			pn_offs = ieee80211_hdrlen(hdr->frame_control);
+ 
+-		ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs,
+-					   tx.key, skb);
++		r = ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs,
++					       tx.key, &tx);
++		if (r != TX_CONTINUE) {
++			ieee80211_free_txskb(&local->hw, skb);
++			goto begin;
++		}
+ 	} else {
+ 		if (invoke_tx_handlers_late(&tx))
+ 			goto begin;