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 */
7
8 #include "mesh.h"
9 #include "wme.h"
10
11
12 /* mesh PS management */
13
14 /**
15 * mps_qos_null_get - create pre-addressed QoS Null frame for mesh powersave
16 */
mps_qos_null_get(struct sta_info * sta)17 static struct sk_buff *mps_qos_null_get(struct sta_info *sta)
18 {
19 struct ieee80211_sub_if_data *sdata = sta->sdata;
20 struct ieee80211_local *local = sdata->local;
21 struct ieee80211_hdr *nullfunc; /* use 4addr header */
22 struct sk_buff *skb;
23 int size = sizeof(*nullfunc);
24 __le16 fc;
25
26 skb = dev_alloc_skb(local->hw.extra_tx_headroom + size + 2);
27 if (!skb)
28 return NULL;
29 skb_reserve(skb, local->hw.extra_tx_headroom);
30
31 nullfunc = skb_put(skb, size);
32 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_QOS_NULLFUNC);
33 ieee80211_fill_mesh_addresses(nullfunc, &fc, sta->sta.addr,
34 sdata->vif.addr);
35 nullfunc->frame_control = fc;
36 nullfunc->duration_id = 0;
37 nullfunc->seq_ctrl = 0;
38 /* no address resolution for this frame -> set addr 1 immediately */
39 memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
40 skb_put_zero(skb, 2); /* append QoS control field */
41 ieee80211_mps_set_frame_flags(sdata, sta, nullfunc);
42
43 return skb;
44 }
45
46 /**
47 * mps_qos_null_tx - send a QoS Null to indicate link-specific power mode
48 */
mps_qos_null_tx(struct sta_info * sta)49 static void mps_qos_null_tx(struct sta_info *sta)
50 {
51 struct sk_buff *skb;
52
53 skb = mps_qos_null_get(sta);
54 if (!skb)
55 return;
56
57 mps_dbg(sta->sdata, "announcing peer-specific power mode to %pM\n",
58 sta->sta.addr);
59
60 /* don't unintentionally start a MPSP */
61 if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
62 u8 *qc = ieee80211_get_qos_ctl((void *) skb->data);
63
64 qc[0] |= IEEE80211_QOS_CTL_EOSP;
65 }
66
67 ieee80211_tx_skb(sta->sdata, skb);
68 }
69
70 /**
71 * ieee80211_mps_local_status_update - track status of local link-specific PMs
72 *
73 * @sdata: local mesh subif
74 *
75 * sets the non-peer power mode and triggers the driver PS (re-)configuration
76 * Return BSS_CHANGED_BEACON if a beacon update is necessary.
77 */
ieee80211_mps_local_status_update(struct ieee80211_sub_if_data * sdata)78 u32 ieee80211_mps_local_status_update(struct ieee80211_sub_if_data *sdata)
79 {
80 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
81 struct sta_info *sta;
82 bool peering = false;
83 int light_sleep_cnt = 0;
84 int deep_sleep_cnt = 0;
85 u32 changed = 0;
86 enum nl80211_mesh_power_mode nonpeer_pm;
87
88 rcu_read_lock();
89 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
90 if (sdata != sta->sdata)
91 continue;
92
93 switch (sta->mesh->plink_state) {
94 case NL80211_PLINK_OPN_SNT:
95 case NL80211_PLINK_OPN_RCVD:
96 case NL80211_PLINK_CNF_RCVD:
97 peering = true;
98 break;
99 case NL80211_PLINK_ESTAB:
100 if (sta->mesh->local_pm == NL80211_MESH_POWER_LIGHT_SLEEP)
101 light_sleep_cnt++;
102 else if (sta->mesh->local_pm == NL80211_MESH_POWER_DEEP_SLEEP)
103 deep_sleep_cnt++;
104 break;
105 default:
106 break;
107 }
108 }
109 rcu_read_unlock();
110
111 /*
112 * Set non-peer mode to active during peering/scanning/authentication
113 * (see IEEE802.11-2012 13.14.8.3). The non-peer mesh power mode is
114 * deep sleep if the local STA is in light or deep sleep towards at
115 * least one mesh peer (see 13.14.3.1). Otherwise, set it to the
116 * user-configured default value.
117 */
118 if (peering) {
119 mps_dbg(sdata, "setting non-peer PM to active for peering\n");
120 nonpeer_pm = NL80211_MESH_POWER_ACTIVE;
121 } else if (light_sleep_cnt || deep_sleep_cnt) {
122 mps_dbg(sdata, "setting non-peer PM to deep sleep\n");
123 nonpeer_pm = NL80211_MESH_POWER_DEEP_SLEEP;
124 } else {
125 mps_dbg(sdata, "setting non-peer PM to user value\n");
126 nonpeer_pm = ifmsh->mshcfg.power_mode;
127 }
128
129 /* need update if sleep counts move between 0 and non-zero */
130 if (ifmsh->nonpeer_pm != nonpeer_pm ||
131 !ifmsh->ps_peers_light_sleep != !light_sleep_cnt ||
132 !ifmsh->ps_peers_deep_sleep != !deep_sleep_cnt)
133 changed = BSS_CHANGED_BEACON;
134
135 ifmsh->nonpeer_pm = nonpeer_pm;
136 ifmsh->ps_peers_light_sleep = light_sleep_cnt;
137 ifmsh->ps_peers_deep_sleep = deep_sleep_cnt;
138
139 return changed;
140 }
141
142 /**
143 * ieee80211_mps_set_sta_local_pm - set local PM towards a mesh STA
144 *
145 * @sta: mesh STA
146 * @pm: the power mode to set
147 * Return BSS_CHANGED_BEACON if a beacon update is in order.
148 */
ieee80211_mps_set_sta_local_pm(struct sta_info * sta,enum nl80211_mesh_power_mode pm)149 u32 ieee80211_mps_set_sta_local_pm(struct sta_info *sta,
150 enum nl80211_mesh_power_mode pm)
151 {
152 struct ieee80211_sub_if_data *sdata = sta->sdata;
153
154 if (sta->mesh->local_pm == pm)
155 return 0;
156
157 mps_dbg(sdata, "local STA operates in mode %d with %pM\n",
158 pm, sta->sta.addr);
159
160 sta->mesh->local_pm = pm;
161
162 /*
163 * announce peer-specific power mode transition
164 * (see IEEE802.11-2012 13.14.3.2 and 13.14.3.3)
165 */
166 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
167 mps_qos_null_tx(sta);
168
169 return ieee80211_mps_local_status_update(sdata);
170 }
171
172 /**
173 * ieee80211_mps_set_frame_flags - set mesh PS flags in FC (and QoS Control)
174 *
175 * @sdata: local mesh subif
176 * @sta: mesh STA
177 * @hdr: 802.11 frame header
178 *
179 * see IEEE802.11-2012 8.2.4.1.7 and 8.2.4.5.11
180 *
181 * NOTE: sta must be given when an individually-addressed QoS frame header
182 * is handled, for group-addressed and management frames it is not used
183 */
ieee80211_mps_set_frame_flags(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct ieee80211_hdr * hdr)184 void ieee80211_mps_set_frame_flags(struct ieee80211_sub_if_data *sdata,
185 struct sta_info *sta,
186 struct ieee80211_hdr *hdr)
187 {
188 enum nl80211_mesh_power_mode pm;
189 u8 *qc;
190
191 if (WARN_ON(is_unicast_ether_addr(hdr->addr1) &&
192 ieee80211_is_data_qos(hdr->frame_control) &&
193 !sta))
194 return;
195
196 if (is_unicast_ether_addr(hdr->addr1) &&
197 ieee80211_is_data_qos(hdr->frame_control) &&
198 sta->mesh->plink_state == NL80211_PLINK_ESTAB)
199 pm = sta->mesh->local_pm;
200 else
201 pm = sdata->u.mesh.nonpeer_pm;
202
203 if (pm == NL80211_MESH_POWER_ACTIVE)
204 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_PM);
205 else
206 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
207
208 if (!ieee80211_is_data_qos(hdr->frame_control))
209 return;
210
211 qc = ieee80211_get_qos_ctl(hdr);
212
213 if ((is_unicast_ether_addr(hdr->addr1) &&
214 pm == NL80211_MESH_POWER_DEEP_SLEEP) ||
215 (is_multicast_ether_addr(hdr->addr1) &&
216 sdata->u.mesh.ps_peers_deep_sleep > 0))
217 qc[1] |= (IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8);
218 else
219 qc[1] &= ~(IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8);
220 }
221
222 /**
223 * ieee80211_mps_sta_status_update - update buffering status of neighbor STA
224 *
225 * @sta: mesh STA
226 *
227 * called after change of peering status or non-peer/peer-specific power mode
228 */
ieee80211_mps_sta_status_update(struct sta_info * sta)229 void ieee80211_mps_sta_status_update(struct sta_info *sta)
230 {
231 enum nl80211_mesh_power_mode pm;
232 bool do_buffer;
233
234 /* For non-assoc STA, prevent buffering or frame transmission */
235 if (sta->sta_state < IEEE80211_STA_ASSOC)
236 return;
237
238 /*
239 * use peer-specific power mode if peering is established and the
240 * peer's power mode is known
241 */
242 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
243 sta->mesh->peer_pm != NL80211_MESH_POWER_UNKNOWN)
244 pm = sta->mesh->peer_pm;
245 else
246 pm = sta->mesh->nonpeer_pm;
247
248 do_buffer = (pm != NL80211_MESH_POWER_ACTIVE);
249
250 /* clear the MPSP flags for non-peers or active STA */
251 if (sta->mesh->plink_state != NL80211_PLINK_ESTAB) {
252 clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
253 clear_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
254 } else if (!do_buffer) {
255 clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
256 }
257
258 /* Don't let the same PS state be set twice */
259 if (test_sta_flag(sta, WLAN_STA_PS_STA) == do_buffer)
260 return;
261
262 if (do_buffer) {
263 set_sta_flag(sta, WLAN_STA_PS_STA);
264 atomic_inc(&sta->sdata->u.mesh.ps.num_sta_ps);
265 mps_dbg(sta->sdata, "start PS buffering frames towards %pM\n",
266 sta->sta.addr);
267 } else {
268 ieee80211_sta_ps_deliver_wakeup(sta);
269 }
270 }
271
mps_set_sta_peer_pm(struct sta_info * sta,struct ieee80211_hdr * hdr)272 static void mps_set_sta_peer_pm(struct sta_info *sta,
273 struct ieee80211_hdr *hdr)
274 {
275 enum nl80211_mesh_power_mode pm;
276 u8 *qc = ieee80211_get_qos_ctl(hdr);
277
278 /*
279 * Test Power Management field of frame control (PW) and
280 * mesh power save level subfield of QoS control field (PSL)
281 *
282 * | PM | PSL| Mesh PM |
283 * +----+----+---------+
284 * | 0 |Rsrv| Active |
285 * | 1 | 0 | Light |
286 * | 1 | 1 | Deep |
287 */
288 if (ieee80211_has_pm(hdr->frame_control)) {
289 if (qc[1] & (IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8))
290 pm = NL80211_MESH_POWER_DEEP_SLEEP;
291 else
292 pm = NL80211_MESH_POWER_LIGHT_SLEEP;
293 } else {
294 pm = NL80211_MESH_POWER_ACTIVE;
295 }
296
297 if (sta->mesh->peer_pm == pm)
298 return;
299
300 mps_dbg(sta->sdata, "STA %pM enters mode %d\n",
301 sta->sta.addr, pm);
302
303 sta->mesh->peer_pm = pm;
304
305 ieee80211_mps_sta_status_update(sta);
306 }
307
mps_set_sta_nonpeer_pm(struct sta_info * sta,struct ieee80211_hdr * hdr)308 static void mps_set_sta_nonpeer_pm(struct sta_info *sta,
309 struct ieee80211_hdr *hdr)
310 {
311 enum nl80211_mesh_power_mode pm;
312
313 if (ieee80211_has_pm(hdr->frame_control))
314 pm = NL80211_MESH_POWER_DEEP_SLEEP;
315 else
316 pm = NL80211_MESH_POWER_ACTIVE;
317
318 if (sta->mesh->nonpeer_pm == pm)
319 return;
320
321 mps_dbg(sta->sdata, "STA %pM sets non-peer mode to %d\n",
322 sta->sta.addr, pm);
323
324 sta->mesh->nonpeer_pm = pm;
325
326 ieee80211_mps_sta_status_update(sta);
327 }
328
329 /**
330 * ieee80211_mps_rx_h_sta_process - frame receive handler for mesh powersave
331 *
332 * @sta: STA info that transmitted the frame
333 * @hdr: IEEE 802.11 (QoS) Header
334 */
ieee80211_mps_rx_h_sta_process(struct sta_info * sta,struct ieee80211_hdr * hdr)335 void ieee80211_mps_rx_h_sta_process(struct sta_info *sta,
336 struct ieee80211_hdr *hdr)
337 {
338 if (is_unicast_ether_addr(hdr->addr1) &&
339 ieee80211_is_data_qos(hdr->frame_control)) {
340 /*
341 * individually addressed QoS Data/Null frames contain
342 * peer link-specific PS mode towards the local STA
343 */
344 mps_set_sta_peer_pm(sta, hdr);
345
346 /* check for mesh Peer Service Period trigger frames */
347 ieee80211_mpsp_trigger_process(ieee80211_get_qos_ctl(hdr),
348 sta, false, false);
349 } else {
350 /*
351 * can only determine non-peer PS mode
352 * (see IEEE802.11-2012 8.2.4.1.7)
353 */
354 mps_set_sta_nonpeer_pm(sta, hdr);
355 }
356 }
357
358
359 /* mesh PS frame release */
360
mpsp_trigger_send(struct sta_info * sta,bool rspi,bool eosp)361 static void mpsp_trigger_send(struct sta_info *sta, bool rspi, bool eosp)
362 {
363 struct ieee80211_sub_if_data *sdata = sta->sdata;
364 struct sk_buff *skb;
365 struct ieee80211_hdr *nullfunc;
366 struct ieee80211_tx_info *info;
367 u8 *qc;
368
369 skb = mps_qos_null_get(sta);
370 if (!skb)
371 return;
372
373 nullfunc = (struct ieee80211_hdr *) skb->data;
374 if (!eosp)
375 nullfunc->frame_control |=
376 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
377 /*
378 * | RSPI | EOSP | MPSP triggering |
379 * +------+------+--------------------+
380 * | 0 | 0 | local STA is owner |
381 * | 0 | 1 | no MPSP (MPSP end) |
382 * | 1 | 0 | both STA are owner |
383 * | 1 | 1 | peer STA is owner | see IEEE802.11-2012 13.14.9.2
384 */
385 qc = ieee80211_get_qos_ctl(nullfunc);
386 if (rspi)
387 qc[1] |= (IEEE80211_QOS_CTL_RSPI >> 8);
388 if (eosp)
389 qc[0] |= IEEE80211_QOS_CTL_EOSP;
390
391 info = IEEE80211_SKB_CB(skb);
392
393 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
394 IEEE80211_TX_CTL_REQ_TX_STATUS;
395
396 mps_dbg(sdata, "sending MPSP trigger%s%s to %pM\n",
397 rspi ? " RSPI" : "", eosp ? " EOSP" : "", sta->sta.addr);
398
399 ieee80211_tx_skb(sdata, skb);
400 }
401
402 /**
403 * mpsp_qos_null_append - append QoS Null frame to MPSP skb queue if needed
404 *
405 * To properly end a mesh MPSP the last transmitted frame has to set the EOSP
406 * flag in the QoS Control field. In case the current tailing frame is not a
407 * QoS Data frame, append a QoS Null to carry the flag.
408 */
mpsp_qos_null_append(struct sta_info * sta,struct sk_buff_head * frames)409 static void mpsp_qos_null_append(struct sta_info *sta,
410 struct sk_buff_head *frames)
411 {
412 struct ieee80211_sub_if_data *sdata = sta->sdata;
413 struct sk_buff *new_skb, *skb = skb_peek_tail(frames);
414 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
415 struct ieee80211_tx_info *info;
416
417 if (ieee80211_is_data_qos(hdr->frame_control))
418 return;
419
420 new_skb = mps_qos_null_get(sta);
421 if (!new_skb)
422 return;
423
424 mps_dbg(sdata, "appending QoS Null in MPSP towards %pM\n",
425 sta->sta.addr);
426 /*
427 * This frame has to be transmitted last. Assign lowest priority to
428 * make sure it cannot pass other frames when releasing multiple ACs.
429 */
430 new_skb->priority = 1;
431 skb_set_queue_mapping(new_skb, IEEE80211_AC_BK);
432 ieee80211_set_qos_hdr(sdata, new_skb);
433
434 info = IEEE80211_SKB_CB(new_skb);
435 info->control.vif = &sdata->vif;
436 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
437
438 __skb_queue_tail(frames, new_skb);
439 }
440
441 /**
442 * mps_frame_deliver - transmit frames during mesh powersave
443 *
444 * @sta: STA info to transmit to
445 * @n_frames: number of frames to transmit. -1 for all
446 */
mps_frame_deliver(struct sta_info * sta,int n_frames)447 static void mps_frame_deliver(struct sta_info *sta, int n_frames)
448 {
449 struct ieee80211_local *local = sta->sdata->local;
450 int ac;
451 struct sk_buff_head frames;
452 struct sk_buff *skb;
453 bool more_data = false;
454
455 skb_queue_head_init(&frames);
456
457 /* collect frame(s) from buffers */
458 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
459 while (n_frames != 0) {
460 skb = skb_dequeue(&sta->tx_filtered[ac]);
461 if (!skb) {
462 skb = skb_dequeue(
463 &sta->ps_tx_buf[ac]);
464 if (skb)
465 local->total_ps_buffered--;
466 }
467 if (!skb)
468 break;
469 n_frames--;
470 __skb_queue_tail(&frames, skb);
471 }
472
473 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
474 !skb_queue_empty(&sta->ps_tx_buf[ac]))
475 more_data = true;
476 }
477
478 /* nothing to send? -> EOSP */
479 if (skb_queue_empty(&frames)) {
480 mpsp_trigger_send(sta, false, true);
481 return;
482 }
483
484 /* in a MPSP make sure the last skb is a QoS Data frame */
485 if (test_sta_flag(sta, WLAN_STA_MPSP_OWNER))
486 mpsp_qos_null_append(sta, &frames);
487
488 mps_dbg(sta->sdata, "sending %d frames to PS STA %pM\n",
489 skb_queue_len(&frames), sta->sta.addr);
490
491 /* prepare collected frames for transmission */
492 skb_queue_walk(&frames, skb) {
493 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
494 struct ieee80211_hdr *hdr = (void *) skb->data;
495
496 /*
497 * Tell TX path to send this frame even though the
498 * STA may still remain is PS mode after this frame
499 * exchange.
500 */
501 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
502
503 if (more_data || !skb_queue_is_last(&frames, skb))
504 hdr->frame_control |=
505 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
506 else
507 hdr->frame_control &=
508 cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
509
510 if (skb_queue_is_last(&frames, skb) &&
511 ieee80211_is_data_qos(hdr->frame_control)) {
512 u8 *qoshdr = ieee80211_get_qos_ctl(hdr);
513
514 /* MPSP trigger frame ends service period */
515 *qoshdr |= IEEE80211_QOS_CTL_EOSP;
516 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
517 }
518 }
519
520 ieee80211_add_pending_skbs(local, &frames);
521 sta_info_recalc_tim(sta);
522 }
523
524 /**
525 * ieee80211_mpsp_trigger_process - track status of mesh Peer Service Periods
526 *
527 * @qc: QoS Control field
528 * @sta: peer to start a MPSP with
529 * @tx: frame was transmitted by the local STA
530 * @acked: frame has been transmitted successfully
531 *
532 * NOTE: active mode STA may only serve as MPSP owner
533 */
ieee80211_mpsp_trigger_process(u8 * qc,struct sta_info * sta,bool tx,bool acked)534 void ieee80211_mpsp_trigger_process(u8 *qc, struct sta_info *sta,
535 bool tx, bool acked)
536 {
537 u8 rspi = qc[1] & (IEEE80211_QOS_CTL_RSPI >> 8);
538 u8 eosp = qc[0] & IEEE80211_QOS_CTL_EOSP;
539
540 if (tx) {
541 if (rspi && acked)
542 set_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
543
544 if (eosp)
545 clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
546 else if (acked &&
547 test_sta_flag(sta, WLAN_STA_PS_STA) &&
548 !test_and_set_sta_flag(sta, WLAN_STA_MPSP_OWNER))
549 mps_frame_deliver(sta, -1);
550 } else {
551 if (eosp)
552 clear_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
553 else if (sta->mesh->local_pm != NL80211_MESH_POWER_ACTIVE)
554 set_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
555
556 if (rspi && !test_and_set_sta_flag(sta, WLAN_STA_MPSP_OWNER))
557 mps_frame_deliver(sta, -1);
558 }
559 }
560
561 /**
562 * ieee80211_mps_frame_release - release frames buffered due to mesh power save
563 *
564 * @sta: mesh STA
565 * @elems: IEs of beacon or probe response
566 *
567 * For peers if we have individually-addressed frames buffered or the peer
568 * indicates buffered frames, send a corresponding MPSP trigger frame. Since
569 * we do not evaluate the awake window duration, QoS Nulls are used as MPSP
570 * trigger frames. If the neighbour STA is not a peer, only send single frames.
571 */
ieee80211_mps_frame_release(struct sta_info * sta,struct ieee802_11_elems * elems)572 void ieee80211_mps_frame_release(struct sta_info *sta,
573 struct ieee802_11_elems *elems)
574 {
575 int ac, buffer_local = 0;
576 bool has_buffered = false;
577
578 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
579 has_buffered = ieee80211_check_tim(elems->tim, elems->tim_len,
580 sta->mesh->aid);
581
582 if (has_buffered)
583 mps_dbg(sta->sdata, "%pM indicates buffered frames\n",
584 sta->sta.addr);
585
586 /* only transmit to PS STA with announced, non-zero awake window */
587 if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
588 (!elems->awake_window || !get_unaligned_le16(elems->awake_window)))
589 return;
590
591 if (!test_sta_flag(sta, WLAN_STA_MPSP_OWNER))
592 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
593 buffer_local += skb_queue_len(&sta->ps_tx_buf[ac]) +
594 skb_queue_len(&sta->tx_filtered[ac]);
595
596 if (!has_buffered && !buffer_local)
597 return;
598
599 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
600 mpsp_trigger_send(sta, has_buffered, !buffer_local);
601 else
602 mps_frame_deliver(sta, 1);
603 }
604