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2024-12-19 9370bb92b2d16684ee45cf24e879c93c509162da 
 kernel/drivers/net/wireless/mediatek/mt76/agg-rx.c
....@@ -1,21 +1,16 @@
1
+// SPDX-License-Identifier: ISC
12 /*
23  * Copyright (C) 2018 Felix Fietkau <nbd@nbd.name>
3
- *
4
- * Permission to use, copy, modify, and/or distribute this software for any
5
- * purpose with or without fee is hereby granted, provided that the above
6
- * copyright notice and this permission notice appear in all copies.
7
- *
8
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
154  */
165 #include "mt76.h"
176 
18
-#define REORDER_TIMEOUT (HZ / 10)
7
+static unsigned long mt76_aggr_tid_to_timeo(u8 tidno)
8
+{
9
+	/* Currently voice traffic (AC_VO) always runs without aggregation,
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+	 * no special handling is needed. AC_BE/AC_BK use tids 0-3. Just check
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+	 * for non AC_BK/AC_BE and set smaller timeout for it. */
12
+	return HZ / (tidno >= 4 ? 25 : 10);
13
+}
1914 
2015 static void
2116 mt76_aggr_release(struct mt76_rx_tid *tid, struct sk_buff_head *frames, int idx)
....@@ -34,8 +29,9 @@
3429 }
3530 
3631 static void
37
-mt76_rx_aggr_release_frames(struct mt76_rx_tid *tid, struct sk_buff_head *frames,
38
-			 u16 head)
32
+mt76_rx_aggr_release_frames(struct mt76_rx_tid *tid,
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+			    struct sk_buff_head *frames,
34
+			    u16 head)
3935 {
4036 	int idx;
4137 
....@@ -74,15 +70,15 @@
7470 	for (idx = (tid->head + 1) % tid->size;
7571 	     idx != start && nframes;
7672 	     idx = (idx + 1) % tid->size) {
77
-
7873 		skb = tid->reorder_buf[idx];
7974 		if (!skb)
8075 			continue;
8176 
8277 		nframes--;
83
-		status = (struct mt76_rx_status *) skb->cb;
84
-		if (!time_after(jiffies, status->reorder_time +
85
-					 REORDER_TIMEOUT))
78
+		status = (struct mt76_rx_status *)skb->cb;
79
+		if (!time_after(jiffies,
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+				status->reorder_time +
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+				mt76_aggr_tid_to_timeo(tid->num)))
8682 			continue;
8783 
8884 		mt76_rx_aggr_release_frames(tid, frames, status->seqno);
....@@ -112,7 +108,7 @@
112108 
113109 	if (nframes)
114110 		ieee80211_queue_delayed_work(tid->dev->hw, &tid->reorder_work,
115
-					     REORDER_TIMEOUT);
111
+					     mt76_aggr_tid_to_timeo(tid->num));
116112 	mt76_rx_complete(dev, &frames, NULL);
117113 
118114 	rcu_read_unlock();
....@@ -122,8 +118,8 @@
122118 static void
123119 mt76_rx_aggr_check_ctl(struct sk_buff *skb, struct sk_buff_head *frames)
124120 {
125
-	struct mt76_rx_status *status = (struct mt76_rx_status *) skb->cb;
126
-	struct ieee80211_bar *bar = (struct ieee80211_bar *) skb->data;
121
+	struct mt76_rx_status *status = (struct mt76_rx_status *)skb->cb;
122
+	struct ieee80211_bar *bar = mt76_skb_get_hdr(skb);
127123 	struct mt76_wcid *wcid = status->wcid;
128124 	struct mt76_rx_tid *tid;
129125 	u16 seqno;
....@@ -135,21 +131,23 @@
135131 		return;
136132 
137133 	status->tid = le16_to_cpu(bar->control) >> 12;
138
-	seqno = le16_to_cpu(bar->start_seq_num) >> 4;
134
+	seqno = IEEE80211_SEQ_TO_SN(le16_to_cpu(bar->start_seq_num));
139135 	tid = rcu_dereference(wcid->aggr[status->tid]);
140136 	if (!tid)
141137 		return;
142138 
143139 	spin_lock_bh(&tid->lock);
144
-	mt76_rx_aggr_release_frames(tid, frames, seqno);
145
-	mt76_rx_aggr_release_head(tid, frames);
140
+	if (!tid->stopped) {
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+		mt76_rx_aggr_release_frames(tid, frames, seqno);
142
+		mt76_rx_aggr_release_head(tid, frames);
143
+	}
146144 	spin_unlock_bh(&tid->lock);
147145 }
148146 
149147 void mt76_rx_aggr_reorder(struct sk_buff *skb, struct sk_buff_head *frames)
150148 {
151
-	struct mt76_rx_status *status = (struct mt76_rx_status *) skb->cb;
152
-	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
149
+	struct mt76_rx_status *status = (struct mt76_rx_status *)skb->cb;
150
+	struct ieee80211_hdr *hdr = mt76_skb_get_hdr(skb);
153151 	struct mt76_wcid *wcid = status->wcid;
154152 	struct ieee80211_sta *sta;
155153 	struct mt76_rx_tid *tid;
....@@ -233,7 +231,8 @@
233231 	tid->nframes++;
234232 	mt76_rx_aggr_release_head(tid, frames);
235233 
236
-	ieee80211_queue_delayed_work(tid->dev->hw, &tid->reorder_work, REORDER_TIMEOUT);
234
+	ieee80211_queue_delayed_work(tid->dev->hw, &tid->reorder_work,
235
+				     mt76_aggr_tid_to_timeo(tid->num));
237236 
238237 out:
239238 	spin_unlock_bh(&tid->lock);
....@@ -253,6 +252,7 @@
253252 	tid->dev = dev;
254253 	tid->head = ssn;
255254 	tid->size = size;
255
+	tid->num = tidno;
256256 	INIT_DELAYED_WORK(&tid->reorder_work, mt76_rx_aggr_reorder_work);
257257 	spin_lock_init(&tid->lock);
258258 
....@@ -266,8 +266,6 @@
266266 {
267267 	u16 size = tid->size;
268268 	int i;
269
-
270
-	cancel_delayed_work(&tid->reorder_work);
271269 
272270 	spin_lock_bh(&tid->lock);
273271 
....@@ -284,21 +282,19 @@
284282 	}
285283 
286284 	spin_unlock_bh(&tid->lock);
285
+
286
+	cancel_delayed_work_sync(&tid->reorder_work);
287287 }
288288 
289289 void mt76_rx_aggr_stop(struct mt76_dev *dev, struct mt76_wcid *wcid, u8 tidno)
290290 {
291
-	struct mt76_rx_tid *tid;
291
+	struct mt76_rx_tid *tid = NULL;
292292 
293
-	rcu_read_lock();
294
-
295
-	tid = rcu_dereference(wcid->aggr[tidno]);
293
+	tid = rcu_replace_pointer(wcid->aggr[tidno], tid,
294
+				  lockdep_is_held(&dev->mutex));
296295 	if (tid) {
297
-		rcu_assign_pointer(wcid->aggr[tidno], NULL);
298296 		mt76_rx_aggr_shutdown(dev, tid);
299297 		kfree_rcu(tid, rcu_head);
300298 	}
301
-
302
-	rcu_read_unlock();
303299 }
304300 EXPORT_SYMBOL_GPL(mt76_rx_aggr_stop);