1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright 2012-2013, Marco Porsch <marco.porsch@s2005.tu-chemnitz.de>
4  * Copyright 2012-2013, cozybit Inc.
5  * Copyright (C) 2021 Intel Corporation
6  * Copyright (C) 2023 Intel Corporation
7  */
8 
9 #include "mesh.h"
10 #include "wme.h"
11 
12 
13 /* mesh PS management */
14 
15 /**
16  * mps_qos_null_get - create pre-addressed QoS Null frame for mesh powersave
17  * @sta: the station to get the frame for
18  */
mps_qos_null_get(struct sta_info * sta)19 static struct sk_buff *mps_qos_null_get(struct sta_info *sta)
20 {
21 	struct ieee80211_sub_if_data *sdata = sta->sdata;
22 	struct ieee80211_local *local = sdata->local;
23 	struct ieee80211_hdr *nullfunc; /* use 4addr header */
24 	struct sk_buff *skb;
25 	int size = sizeof(*nullfunc);
26 	__le16 fc;
27 
28 	skb = dev_alloc_skb(local->hw.extra_tx_headroom + size + 2);
29 	if (!skb)
30 		return NULL;
31 	skb_reserve(skb, local->hw.extra_tx_headroom);
32 
33 	nullfunc = skb_put(skb, size);
34 	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_QOS_NULLFUNC);
35 	ieee80211_fill_mesh_addresses(nullfunc, &fc, sta->sta.addr,
36 				      sdata->vif.addr);
37 	nullfunc->frame_control = fc;
38 	nullfunc->duration_id = 0;
39 	nullfunc->seq_ctrl = 0;
40 	/* no address resolution for this frame -> set addr 1 immediately */
41 	memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
42 	skb_put_zero(skb, 2); /* append QoS control field */
43 	ieee80211_mps_set_frame_flags(sdata, sta, nullfunc);
44 
45 	return skb;
46 }
47 
48 /**
49  * mps_qos_null_tx - send a QoS Null to indicate link-specific power mode
50  * @sta: the station to send to
51  */
mps_qos_null_tx(struct sta_info * sta)52 static void mps_qos_null_tx(struct sta_info *sta)
53 {
54 	struct sk_buff *skb;
55 
56 	skb = mps_qos_null_get(sta);
57 	if (!skb)
58 		return;
59 
60 	mps_dbg(sta->sdata, "announcing peer-specific power mode to %pM\n",
61 		sta->sta.addr);
62 
63 	/* don't unintentionally start a MPSP */
64 	if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
65 		u8 *qc = ieee80211_get_qos_ctl((void *) skb->data);
66 
67 		qc[0] |= IEEE80211_QOS_CTL_EOSP;
68 	}
69 
70 	ieee80211_tx_skb(sta->sdata, skb);
71 }
72 
73 /**
74  * ieee80211_mps_local_status_update - track status of local link-specific PMs
75  *
76  * @sdata: local mesh subif
77  *
78  * sets the non-peer power mode and triggers the driver PS (re-)configuration
79  * Return BSS_CHANGED_BEACON if a beacon update is necessary.
80  */
ieee80211_mps_local_status_update(struct ieee80211_sub_if_data * sdata)81 u64 ieee80211_mps_local_status_update(struct ieee80211_sub_if_data *sdata)
82 {
83 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
84 	struct sta_info *sta;
85 	bool peering = false;
86 	int light_sleep_cnt = 0;
87 	int deep_sleep_cnt = 0;
88 	u64 changed = 0;
89 	enum nl80211_mesh_power_mode nonpeer_pm;
90 
91 	rcu_read_lock();
92 	list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
93 		if (sdata != sta->sdata)
94 			continue;
95 
96 		switch (sta->mesh->plink_state) {
97 		case NL80211_PLINK_OPN_SNT:
98 		case NL80211_PLINK_OPN_RCVD:
99 		case NL80211_PLINK_CNF_RCVD:
100 			peering = true;
101 			break;
102 		case NL80211_PLINK_ESTAB:
103 			if (sta->mesh->local_pm == NL80211_MESH_POWER_LIGHT_SLEEP)
104 				light_sleep_cnt++;
105 			else if (sta->mesh->local_pm == NL80211_MESH_POWER_DEEP_SLEEP)
106 				deep_sleep_cnt++;
107 			break;
108 		default:
109 			break;
110 		}
111 	}
112 	rcu_read_unlock();
113 
114 	/*
115 	 * Set non-peer mode to active during peering/scanning/authentication
116 	 * (see IEEE802.11-2012 13.14.8.3). The non-peer mesh power mode is
117 	 * deep sleep if the local STA is in light or deep sleep towards at
118 	 * least one mesh peer (see 13.14.3.1). Otherwise, set it to the
119 	 * user-configured default value.
120 	 */
121 	if (peering) {
122 		mps_dbg(sdata, "setting non-peer PM to active for peering\n");
123 		nonpeer_pm = NL80211_MESH_POWER_ACTIVE;
124 	} else if (light_sleep_cnt || deep_sleep_cnt) {
125 		mps_dbg(sdata, "setting non-peer PM to deep sleep\n");
126 		nonpeer_pm = NL80211_MESH_POWER_DEEP_SLEEP;
127 	} else {
128 		mps_dbg(sdata, "setting non-peer PM to user value\n");
129 		nonpeer_pm = ifmsh->mshcfg.power_mode;
130 	}
131 
132 	/* need update if sleep counts move between 0 and non-zero */
133 	if (ifmsh->nonpeer_pm != nonpeer_pm ||
134 	    !ifmsh->ps_peers_light_sleep != !light_sleep_cnt ||
135 	    !ifmsh->ps_peers_deep_sleep != !deep_sleep_cnt)
136 		changed = BSS_CHANGED_BEACON;
137 
138 	ifmsh->nonpeer_pm = nonpeer_pm;
139 	ifmsh->ps_peers_light_sleep = light_sleep_cnt;
140 	ifmsh->ps_peers_deep_sleep = deep_sleep_cnt;
141 
142 	return changed;
143 }
144 
145 /**
146  * ieee80211_mps_set_sta_local_pm - set local PM towards a mesh STA
147  *
148  * @sta: mesh STA
149  * @pm: the power mode to set
150  * Return BSS_CHANGED_BEACON if a beacon update is in order.
151  */
ieee80211_mps_set_sta_local_pm(struct sta_info * sta,enum nl80211_mesh_power_mode pm)152 u64 ieee80211_mps_set_sta_local_pm(struct sta_info *sta,
153 				   enum nl80211_mesh_power_mode pm)
154 {
155 	struct ieee80211_sub_if_data *sdata = sta->sdata;
156 
157 	if (sta->mesh->local_pm == pm)
158 		return 0;
159 
160 	mps_dbg(sdata, "local STA operates in mode %d with %pM\n",
161 		pm, sta->sta.addr);
162 
163 	sta->mesh->local_pm = pm;
164 
165 	/*
166 	 * announce peer-specific power mode transition
167 	 * (see IEEE802.11-2012 13.14.3.2 and 13.14.3.3)
168 	 */
169 	if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
170 		mps_qos_null_tx(sta);
171 
172 	return ieee80211_mps_local_status_update(sdata);
173 }
174 
175 /**
176  * ieee80211_mps_set_frame_flags - set mesh PS flags in FC (and QoS Control)
177  *
178  * @sdata: local mesh subif
179  * @sta: mesh STA
180  * @hdr: 802.11 frame header
181  *
182  * see IEEE802.11-2012 8.2.4.1.7 and 8.2.4.5.11
183  *
184  * NOTE: sta must be given when an individually-addressed QoS frame header
185  * is handled, for group-addressed and management frames it is not used
186  */
ieee80211_mps_set_frame_flags(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct ieee80211_hdr * hdr)187 void ieee80211_mps_set_frame_flags(struct ieee80211_sub_if_data *sdata,
188 				   struct sta_info *sta,
189 				   struct ieee80211_hdr *hdr)
190 {
191 	enum nl80211_mesh_power_mode pm;
192 	u8 *qc;
193 
194 	if (WARN_ON(is_unicast_ether_addr(hdr->addr1) &&
195 		    ieee80211_is_data_qos(hdr->frame_control) &&
196 		    !sta))
197 		return;
198 
199 	if (is_unicast_ether_addr(hdr->addr1) &&
200 	    ieee80211_is_data_qos(hdr->frame_control) &&
201 	    sta->mesh->plink_state == NL80211_PLINK_ESTAB)
202 		pm = sta->mesh->local_pm;
203 	else
204 		pm = sdata->u.mesh.nonpeer_pm;
205 
206 	if (pm == NL80211_MESH_POWER_ACTIVE)
207 		hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_PM);
208 	else
209 		hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
210 
211 	if (!ieee80211_is_data_qos(hdr->frame_control))
212 		return;
213 
214 	qc = ieee80211_get_qos_ctl(hdr);
215 
216 	if ((is_unicast_ether_addr(hdr->addr1) &&
217 	     pm == NL80211_MESH_POWER_DEEP_SLEEP) ||
218 	    (is_multicast_ether_addr(hdr->addr1) &&
219 	     sdata->u.mesh.ps_peers_deep_sleep > 0))
220 		qc[1] |= (IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8);
221 	else
222 		qc[1] &= ~(IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8);
223 }
224 
225 /**
226  * ieee80211_mps_sta_status_update - update buffering status of neighbor STA
227  *
228  * @sta: mesh STA
229  *
230  * called after change of peering status or non-peer/peer-specific power mode
231  */
ieee80211_mps_sta_status_update(struct sta_info * sta)232 void ieee80211_mps_sta_status_update(struct sta_info *sta)
233 {
234 	enum nl80211_mesh_power_mode pm;
235 	bool do_buffer;
236 
237 	/* For non-assoc STA, prevent buffering or frame transmission */
238 	if (sta->sta_state < IEEE80211_STA_ASSOC)
239 		return;
240 
241 	/*
242 	 * use peer-specific power mode if peering is established and the
243 	 * peer's power mode is known
244 	 */
245 	if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
246 	    sta->mesh->peer_pm != NL80211_MESH_POWER_UNKNOWN)
247 		pm = sta->mesh->peer_pm;
248 	else
249 		pm = sta->mesh->nonpeer_pm;
250 
251 	do_buffer = (pm != NL80211_MESH_POWER_ACTIVE);
252 
253 	/* clear the MPSP flags for non-peers or active STA */
254 	if (sta->mesh->plink_state != NL80211_PLINK_ESTAB) {
255 		clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
256 		clear_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
257 	} else if (!do_buffer) {
258 		clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
259 	}
260 
261 	/* Don't let the same PS state be set twice */
262 	if (test_sta_flag(sta, WLAN_STA_PS_STA) == do_buffer)
263 		return;
264 
265 	if (do_buffer) {
266 		set_sta_flag(sta, WLAN_STA_PS_STA);
267 		atomic_inc(&sta->sdata->u.mesh.ps.num_sta_ps);
268 		mps_dbg(sta->sdata, "start PS buffering frames towards %pM\n",
269 			sta->sta.addr);
270 	} else {
271 		ieee80211_sta_ps_deliver_wakeup(sta);
272 	}
273 }
274 
mps_set_sta_peer_pm(struct sta_info * sta,struct ieee80211_hdr * hdr)275 static void mps_set_sta_peer_pm(struct sta_info *sta,
276 				struct ieee80211_hdr *hdr)
277 {
278 	enum nl80211_mesh_power_mode pm;
279 	u8 *qc = ieee80211_get_qos_ctl(hdr);
280 
281 	/*
282 	 * Test Power Management field of frame control (PW) and
283 	 * mesh power save level subfield of QoS control field (PSL)
284 	 *
285 	 * | PM | PSL| Mesh PM |
286 	 * +----+----+---------+
287 	 * | 0  |Rsrv|  Active |
288 	 * | 1  | 0  |  Light  |
289 	 * | 1  | 1  |  Deep   |
290 	 */
291 	if (ieee80211_has_pm(hdr->frame_control)) {
292 		if (qc[1] & (IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8))
293 			pm = NL80211_MESH_POWER_DEEP_SLEEP;
294 		else
295 			pm = NL80211_MESH_POWER_LIGHT_SLEEP;
296 	} else {
297 		pm = NL80211_MESH_POWER_ACTIVE;
298 	}
299 
300 	if (sta->mesh->peer_pm == pm)
301 		return;
302 
303 	mps_dbg(sta->sdata, "STA %pM enters mode %d\n",
304 		sta->sta.addr, pm);
305 
306 	sta->mesh->peer_pm = pm;
307 
308 	ieee80211_mps_sta_status_update(sta);
309 }
310 
mps_set_sta_nonpeer_pm(struct sta_info * sta,struct ieee80211_hdr * hdr)311 static void mps_set_sta_nonpeer_pm(struct sta_info *sta,
312 				   struct ieee80211_hdr *hdr)
313 {
314 	enum nl80211_mesh_power_mode pm;
315 
316 	if (ieee80211_has_pm(hdr->frame_control))
317 		pm = NL80211_MESH_POWER_DEEP_SLEEP;
318 	else
319 		pm = NL80211_MESH_POWER_ACTIVE;
320 
321 	if (sta->mesh->nonpeer_pm == pm)
322 		return;
323 
324 	mps_dbg(sta->sdata, "STA %pM sets non-peer mode to %d\n",
325 		sta->sta.addr, pm);
326 
327 	sta->mesh->nonpeer_pm = pm;
328 
329 	ieee80211_mps_sta_status_update(sta);
330 }
331 
332 /**
333  * ieee80211_mps_rx_h_sta_process - frame receive handler for mesh powersave
334  *
335  * @sta: STA info that transmitted the frame
336  * @hdr: IEEE 802.11 (QoS) Header
337  */
ieee80211_mps_rx_h_sta_process(struct sta_info * sta,struct ieee80211_hdr * hdr)338 void ieee80211_mps_rx_h_sta_process(struct sta_info *sta,
339 				    struct ieee80211_hdr *hdr)
340 {
341 	if (is_unicast_ether_addr(hdr->addr1) &&
342 	    ieee80211_is_data_qos(hdr->frame_control)) {
343 		/*
344 		 * individually addressed QoS Data/Null frames contain
345 		 * peer link-specific PS mode towards the local STA
346 		 */
347 		mps_set_sta_peer_pm(sta, hdr);
348 
349 		/* check for mesh Peer Service Period trigger frames */
350 		ieee80211_mpsp_trigger_process(ieee80211_get_qos_ctl(hdr),
351 					       sta, false, false);
352 	} else {
353 		/*
354 		 * can only determine non-peer PS mode
355 		 * (see IEEE802.11-2012 8.2.4.1.7)
356 		 */
357 		mps_set_sta_nonpeer_pm(sta, hdr);
358 	}
359 }
360 
361 
362 /* mesh PS frame release */
363 
mpsp_trigger_send(struct sta_info * sta,bool rspi,bool eosp)364 static void mpsp_trigger_send(struct sta_info *sta, bool rspi, bool eosp)
365 {
366 	struct ieee80211_sub_if_data *sdata = sta->sdata;
367 	struct sk_buff *skb;
368 	struct ieee80211_hdr *nullfunc;
369 	struct ieee80211_tx_info *info;
370 	u8 *qc;
371 
372 	skb = mps_qos_null_get(sta);
373 	if (!skb)
374 		return;
375 
376 	nullfunc = (struct ieee80211_hdr *) skb->data;
377 	if (!eosp)
378 		nullfunc->frame_control |=
379 				cpu_to_le16(IEEE80211_FCTL_MOREDATA);
380 	/*
381 	 * | RSPI | EOSP |  MPSP triggering   |
382 	 * +------+------+--------------------+
383 	 * |  0   |  0   | local STA is owner |
384 	 * |  0   |  1   | no MPSP (MPSP end) |
385 	 * |  1   |  0   | both STA are owner |
386 	 * |  1   |  1   | peer STA is owner  | see IEEE802.11-2012 13.14.9.2
387 	 */
388 	qc = ieee80211_get_qos_ctl(nullfunc);
389 	if (rspi)
390 		qc[1] |= (IEEE80211_QOS_CTL_RSPI >> 8);
391 	if (eosp)
392 		qc[0] |= IEEE80211_QOS_CTL_EOSP;
393 
394 	info = IEEE80211_SKB_CB(skb);
395 
396 	info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
397 		       IEEE80211_TX_CTL_REQ_TX_STATUS;
398 
399 	mps_dbg(sdata, "sending MPSP trigger%s%s to %pM\n",
400 		rspi ? " RSPI" : "", eosp ? " EOSP" : "", sta->sta.addr);
401 
402 	ieee80211_tx_skb(sdata, skb);
403 }
404 
405 /**
406  * mpsp_qos_null_append - append QoS Null frame to MPSP skb queue if needed
407  * @sta: the station to handle
408  * @frames: the frame list to append to
409  *
410  * To properly end a mesh MPSP the last transmitted frame has to set the EOSP
411  * flag in the QoS Control field. In case the current tailing frame is not a
412  * QoS Data frame, append a QoS Null to carry the flag.
413  */
mpsp_qos_null_append(struct sta_info * sta,struct sk_buff_head * frames)414 static void mpsp_qos_null_append(struct sta_info *sta,
415 				 struct sk_buff_head *frames)
416 {
417 	struct ieee80211_sub_if_data *sdata = sta->sdata;
418 	struct sk_buff *new_skb, *skb = skb_peek_tail(frames);
419 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
420 	struct ieee80211_tx_info *info;
421 
422 	if (ieee80211_is_data_qos(hdr->frame_control))
423 		return;
424 
425 	new_skb = mps_qos_null_get(sta);
426 	if (!new_skb)
427 		return;
428 
429 	mps_dbg(sdata, "appending QoS Null in MPSP towards %pM\n",
430 		sta->sta.addr);
431 	/*
432 	 * This frame has to be transmitted last. Assign lowest priority to
433 	 * make sure it cannot pass other frames when releasing multiple ACs.
434 	 */
435 	new_skb->priority = 1;
436 	skb_set_queue_mapping(new_skb, IEEE80211_AC_BK);
437 	ieee80211_set_qos_hdr(sdata, new_skb);
438 
439 	info = IEEE80211_SKB_CB(new_skb);
440 	info->control.vif = &sdata->vif;
441 	info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
442 
443 	__skb_queue_tail(frames, new_skb);
444 }
445 
446 /**
447  * mps_frame_deliver - transmit frames during mesh powersave
448  *
449  * @sta: STA info to transmit to
450  * @n_frames: number of frames to transmit. -1 for all
451  */
mps_frame_deliver(struct sta_info * sta,int n_frames)452 static void mps_frame_deliver(struct sta_info *sta, int n_frames)
453 {
454 	struct ieee80211_local *local = sta->sdata->local;
455 	int ac;
456 	struct sk_buff_head frames;
457 	struct sk_buff *skb;
458 	bool more_data = false;
459 
460 	skb_queue_head_init(&frames);
461 
462 	/* collect frame(s) from buffers */
463 	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
464 		while (n_frames != 0) {
465 			skb = skb_dequeue(&sta->tx_filtered[ac]);
466 			if (!skb) {
467 				skb = skb_dequeue(
468 					&sta->ps_tx_buf[ac]);
469 				if (skb)
470 					local->total_ps_buffered--;
471 			}
472 			if (!skb)
473 				break;
474 			n_frames--;
475 			__skb_queue_tail(&frames, skb);
476 		}
477 
478 		if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
479 		    !skb_queue_empty(&sta->ps_tx_buf[ac]))
480 			more_data = true;
481 	}
482 
483 	/* nothing to send? -> EOSP */
484 	if (skb_queue_empty(&frames)) {
485 		mpsp_trigger_send(sta, false, true);
486 		return;
487 	}
488 
489 	/* in a MPSP make sure the last skb is a QoS Data frame */
490 	if (test_sta_flag(sta, WLAN_STA_MPSP_OWNER))
491 		mpsp_qos_null_append(sta, &frames);
492 
493 	mps_dbg(sta->sdata, "sending %d frames to PS STA %pM\n",
494 		skb_queue_len(&frames), sta->sta.addr);
495 
496 	/* prepare collected frames for transmission */
497 	skb_queue_walk(&frames, skb) {
498 		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
499 		struct ieee80211_hdr *hdr = (void *) skb->data;
500 
501 		/*
502 		 * Tell TX path to send this frame even though the
503 		 * STA may still remain is PS mode after this frame
504 		 * exchange.
505 		 */
506 		info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
507 
508 		if (more_data || !skb_queue_is_last(&frames, skb))
509 			hdr->frame_control |=
510 				cpu_to_le16(IEEE80211_FCTL_MOREDATA);
511 		else
512 			hdr->frame_control &=
513 				cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
514 
515 		if (skb_queue_is_last(&frames, skb) &&
516 		    ieee80211_is_data_qos(hdr->frame_control)) {
517 			u8 *qoshdr = ieee80211_get_qos_ctl(hdr);
518 
519 			/* MPSP trigger frame ends service period */
520 			*qoshdr |= IEEE80211_QOS_CTL_EOSP;
521 			info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
522 		}
523 	}
524 
525 	ieee80211_add_pending_skbs(local, &frames);
526 	sta_info_recalc_tim(sta);
527 }
528 
529 /**
530  * ieee80211_mpsp_trigger_process - track status of mesh Peer Service Periods
531  *
532  * @qc: QoS Control field
533  * @sta: peer to start a MPSP with
534  * @tx: frame was transmitted by the local STA
535  * @acked: frame has been transmitted successfully
536  *
537  * NOTE: active mode STA may only serve as MPSP owner
538  */
ieee80211_mpsp_trigger_process(u8 * qc,struct sta_info * sta,bool tx,bool acked)539 void ieee80211_mpsp_trigger_process(u8 *qc, struct sta_info *sta,
540 				    bool tx, bool acked)
541 {
542 	u8 rspi = qc[1] & (IEEE80211_QOS_CTL_RSPI >> 8);
543 	u8 eosp = qc[0] & IEEE80211_QOS_CTL_EOSP;
544 
545 	if (tx) {
546 		if (rspi && acked)
547 			set_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
548 
549 		if (eosp)
550 			clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
551 		else if (acked &&
552 			 test_sta_flag(sta, WLAN_STA_PS_STA) &&
553 			 !test_and_set_sta_flag(sta, WLAN_STA_MPSP_OWNER))
554 			mps_frame_deliver(sta, -1);
555 	} else {
556 		if (eosp)
557 			clear_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
558 		else if (sta->mesh->local_pm != NL80211_MESH_POWER_ACTIVE)
559 			set_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
560 
561 		if (rspi && !test_and_set_sta_flag(sta, WLAN_STA_MPSP_OWNER))
562 			mps_frame_deliver(sta, -1);
563 	}
564 }
565 
566 /**
567  * ieee80211_mps_frame_release - release frames buffered due to mesh power save
568  *
569  * @sta: mesh STA
570  * @elems: IEs of beacon or probe response
571  *
572  * For peers if we have individually-addressed frames buffered or the peer
573  * indicates buffered frames, send a corresponding MPSP trigger frame. Since
574  * we do not evaluate the awake window duration, QoS Nulls are used as MPSP
575  * trigger frames. If the neighbour STA is not a peer, only send single frames.
576  */
ieee80211_mps_frame_release(struct sta_info * sta,struct ieee802_11_elems * elems)577 void ieee80211_mps_frame_release(struct sta_info *sta,
578 				 struct ieee802_11_elems *elems)
579 {
580 	int ac, buffer_local = 0;
581 	bool has_buffered = false;
582 
583 	if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
584 		has_buffered = ieee80211_check_tim(elems->tim, elems->tim_len,
585 						   sta->mesh->aid);
586 
587 	if (has_buffered)
588 		mps_dbg(sta->sdata, "%pM indicates buffered frames\n",
589 			sta->sta.addr);
590 
591 	/* only transmit to PS STA with announced, non-zero awake window */
592 	if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
593 	    (!elems->awake_window || !get_unaligned_le16(elems->awake_window)))
594 		return;
595 
596 	if (!test_sta_flag(sta, WLAN_STA_MPSP_OWNER))
597 		for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
598 			buffer_local += skb_queue_len(&sta->ps_tx_buf[ac]) +
599 					skb_queue_len(&sta->tx_filtered[ac]);
600 
601 	if (!has_buffered && !buffer_local)
602 		return;
603 
604 	if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
605 		mpsp_trigger_send(sta, has_buffered, !buffer_local);
606 	else
607 		mps_frame_deliver(sta, 1);
608 }
609