blob: 3b7bfc01ee36e922927958be79e1ec7414c8a3d6 [file] [log] [blame]
Marco Porsch3f52b7e2013-01-30 18:14:08 +01001/*
2 * Copyright 2012-2013, Marco Porsch <marco.porsch@s2005.tu-chemnitz.de>
3 * Copyright 2012-2013, cozybit Inc.
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 */
9
10#include "mesh.h"
11#include "wme.h"
12
13
14/* mesh PS management */
15
16/**
17 * mps_qos_null_get - create pre-addressed QoS Null frame for mesh powersave
18 */
19static 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 = (struct ieee80211_hdr *) 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 /* no address resolution for this frame -> set addr 1 immediately */
40 memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
41 memset(skb_put(skb, 2), 0, 2); /* append QoS control field */
42 ieee80211_mps_set_frame_flags(sdata, sta, nullfunc);
43
44 return skb;
45}
46
47/**
48 * mps_qos_null_tx - send a QoS Null to indicate link-specific power mode
49 */
50static void mps_qos_null_tx(struct sta_info *sta)
51{
52 struct sk_buff *skb;
53
54 skb = mps_qos_null_get(sta);
55 if (!skb)
56 return;
57
58 mps_dbg(sta->sdata, "announcing peer-specific power mode to %pM\n",
59 sta->sta.addr);
60
61 /* don't unintentionally start a MPSP */
62 if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
63 u8 *qc = ieee80211_get_qos_ctl((void *) skb->data);
64
65 qc[0] |= IEEE80211_QOS_CTL_EOSP;
66 }
67
68 ieee80211_tx_skb(sta->sdata, skb);
69}
70
71/**
72 * ieee80211_mps_local_status_update - track status of local link-specific PMs
73 *
74 * @sdata: local mesh subif
75 *
76 * sets the non-peer power mode and triggers the driver PS (re-)configuration
Thomas Pedersen39886b62013-02-13 12:14:19 -080077 * Return BSS_CHANGED_BEACON if a beacon update is necessary.
Marco Porsch3f52b7e2013-01-30 18:14:08 +010078 */
Thomas Pedersen39886b62013-02-13 12:14:19 -080079u32 ieee80211_mps_local_status_update(struct ieee80211_sub_if_data *sdata)
Marco Porsch3f52b7e2013-01-30 18:14:08 +010080{
81 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
82 struct sta_info *sta;
83 bool peering = false;
84 int light_sleep_cnt = 0;
85 int deep_sleep_cnt = 0;
Thomas Pedersen39886b62013-02-13 12:14:19 -080086 u32 changed = 0;
87 enum nl80211_mesh_power_mode nonpeer_pm;
Marco Porsch3f52b7e2013-01-30 18:14:08 +010088
89 rcu_read_lock();
90 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
91 if (sdata != sta->sdata)
92 continue;
93
94 switch (sta->plink_state) {
95 case NL80211_PLINK_OPN_SNT:
96 case NL80211_PLINK_OPN_RCVD:
97 case NL80211_PLINK_CNF_RCVD:
98 peering = true;
99 break;
100 case NL80211_PLINK_ESTAB:
101 if (sta->local_pm == NL80211_MESH_POWER_LIGHT_SLEEP)
102 light_sleep_cnt++;
103 else if (sta->local_pm == NL80211_MESH_POWER_DEEP_SLEEP)
104 deep_sleep_cnt++;
105 break;
106 default:
107 break;
108 }
109 }
110 rcu_read_unlock();
111
112 /*
113 * Set non-peer mode to active during peering/scanning/authentication
114 * (see IEEE802.11-2012 13.14.8.3). The non-peer mesh power mode is
115 * deep sleep if the local STA is in light or deep sleep towards at
116 * least one mesh peer (see 13.14.3.1). Otherwise, set it to the
117 * user-configured default value.
118 */
119 if (peering) {
120 mps_dbg(sdata, "setting non-peer PM to active for peering\n");
Thomas Pedersen39886b62013-02-13 12:14:19 -0800121 nonpeer_pm = NL80211_MESH_POWER_ACTIVE;
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100122 } else if (light_sleep_cnt || deep_sleep_cnt) {
123 mps_dbg(sdata, "setting non-peer PM to deep sleep\n");
Thomas Pedersen39886b62013-02-13 12:14:19 -0800124 nonpeer_pm = NL80211_MESH_POWER_DEEP_SLEEP;
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100125 } else {
126 mps_dbg(sdata, "setting non-peer PM to user value\n");
Thomas Pedersen39886b62013-02-13 12:14:19 -0800127 nonpeer_pm = ifmsh->mshcfg.power_mode;
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100128 }
129
Thomas Pedersen39886b62013-02-13 12:14:19 -0800130 /* need update if sleep counts move between 0 and non-zero */
131 if (ifmsh->nonpeer_pm != nonpeer_pm ||
132 !ifmsh->ps_peers_light_sleep != !light_sleep_cnt ||
133 !ifmsh->ps_peers_deep_sleep != !deep_sleep_cnt)
134 changed = BSS_CHANGED_BEACON;
135
136 ifmsh->nonpeer_pm = nonpeer_pm;
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100137 ifmsh->ps_peers_light_sleep = light_sleep_cnt;
138 ifmsh->ps_peers_deep_sleep = deep_sleep_cnt;
Thomas Pedersen39886b62013-02-13 12:14:19 -0800139
140 return changed;
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100141}
142
143/**
144 * ieee80211_mps_set_sta_local_pm - set local PM towards a mesh STA
145 *
146 * @sta: mesh STA
147 * @pm: the power mode to set
Thomas Pedersen39886b62013-02-13 12:14:19 -0800148 * Return BSS_CHANGED_BEACON if a beacon update is in order.
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100149 */
Thomas Pedersen39886b62013-02-13 12:14:19 -0800150u32 ieee80211_mps_set_sta_local_pm(struct sta_info *sta,
151 enum nl80211_mesh_power_mode pm)
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100152{
153 struct ieee80211_sub_if_data *sdata = sta->sdata;
154
155 mps_dbg(sdata, "local STA operates in mode %d with %pM\n",
156 pm, sta->sta.addr);
157
158 sta->local_pm = pm;
159
160 /*
161 * announce peer-specific power mode transition
162 * (see IEEE802.11-2012 13.14.3.2 and 13.14.3.3)
163 */
164 if (sta->plink_state == NL80211_PLINK_ESTAB)
165 mps_qos_null_tx(sta);
166
Thomas Pedersen39886b62013-02-13 12:14:19 -0800167 return ieee80211_mps_local_status_update(sdata);
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100168}
169
170/**
171 * ieee80211_mps_set_frame_flags - set mesh PS flags in FC (and QoS Control)
172 *
173 * @sdata: local mesh subif
174 * @sta: mesh STA
175 * @hdr: 802.11 frame header
176 *
177 * see IEEE802.11-2012 8.2.4.1.7 and 8.2.4.5.11
178 *
179 * NOTE: sta must be given when an individually-addressed QoS frame header
180 * is handled, for group-addressed and management frames it is not used
181 */
182void ieee80211_mps_set_frame_flags(struct ieee80211_sub_if_data *sdata,
183 struct sta_info *sta,
184 struct ieee80211_hdr *hdr)
185{
186 enum nl80211_mesh_power_mode pm;
187 u8 *qc;
188
189 if (WARN_ON(is_unicast_ether_addr(hdr->addr1) &&
190 ieee80211_is_data_qos(hdr->frame_control) &&
191 !sta))
192 return;
193
194 if (is_unicast_ether_addr(hdr->addr1) &&
195 ieee80211_is_data_qos(hdr->frame_control) &&
196 sta->plink_state == NL80211_PLINK_ESTAB)
197 pm = sta->local_pm;
198 else
199 pm = sdata->u.mesh.nonpeer_pm;
200
201 if (pm == NL80211_MESH_POWER_ACTIVE)
202 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_PM);
203 else
204 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
205
206 if (!ieee80211_is_data_qos(hdr->frame_control))
207 return;
208
209 qc = ieee80211_get_qos_ctl(hdr);
210
211 if ((is_unicast_ether_addr(hdr->addr1) &&
212 pm == NL80211_MESH_POWER_DEEP_SLEEP) ||
213 (is_multicast_ether_addr(hdr->addr1) &&
214 sdata->u.mesh.ps_peers_deep_sleep > 0))
215 qc[1] |= (IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8);
216 else
217 qc[1] &= ~(IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8);
218}
219
220/**
221 * ieee80211_mps_sta_status_update - update buffering status of neighbor STA
222 *
223 * @sta: mesh STA
224 *
225 * called after change of peering status or non-peer/peer-specific power mode
226 */
227void ieee80211_mps_sta_status_update(struct sta_info *sta)
228{
229 enum nl80211_mesh_power_mode pm;
230 bool do_buffer;
231
232 /*
233 * use peer-specific power mode if peering is established and the
234 * peer's power mode is known
235 */
236 if (sta->plink_state == NL80211_PLINK_ESTAB &&
237 sta->peer_pm != NL80211_MESH_POWER_UNKNOWN)
238 pm = sta->peer_pm;
239 else
240 pm = sta->nonpeer_pm;
241
242 do_buffer = (pm != NL80211_MESH_POWER_ACTIVE);
243
244 /* Don't let the same PS state be set twice */
245 if (test_sta_flag(sta, WLAN_STA_PS_STA) == do_buffer)
246 return;
247
248 if (do_buffer) {
249 set_sta_flag(sta, WLAN_STA_PS_STA);
250 atomic_inc(&sta->sdata->u.mesh.ps.num_sta_ps);
251 mps_dbg(sta->sdata, "start PS buffering frames towards %pM\n",
252 sta->sta.addr);
253 } else {
254 ieee80211_sta_ps_deliver_wakeup(sta);
255 }
256
257 /* clear the MPSP flags for non-peers or active STA */
258 if (sta->plink_state != NL80211_PLINK_ESTAB) {
259 clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
260 clear_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
261 } else if (!do_buffer) {
262 clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
263 }
264}
265
266static void mps_set_sta_peer_pm(struct sta_info *sta,
267 struct ieee80211_hdr *hdr)
268{
269 enum nl80211_mesh_power_mode pm;
270 u8 *qc = ieee80211_get_qos_ctl(hdr);
271
272 /*
273 * Test Power Management field of frame control (PW) and
274 * mesh power save level subfield of QoS control field (PSL)
275 *
276 * | PM | PSL| Mesh PM |
277 * +----+----+---------+
278 * | 0 |Rsrv| Active |
279 * | 1 | 0 | Light |
280 * | 1 | 1 | Deep |
281 */
282 if (ieee80211_has_pm(hdr->frame_control)) {
283 if (qc[1] & (IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8))
284 pm = NL80211_MESH_POWER_DEEP_SLEEP;
285 else
286 pm = NL80211_MESH_POWER_LIGHT_SLEEP;
287 } else {
288 pm = NL80211_MESH_POWER_ACTIVE;
289 }
290
291 if (sta->peer_pm == pm)
292 return;
293
294 mps_dbg(sta->sdata, "STA %pM enters mode %d\n",
295 sta->sta.addr, pm);
296
297 sta->peer_pm = pm;
298
299 ieee80211_mps_sta_status_update(sta);
300}
301
302static void mps_set_sta_nonpeer_pm(struct sta_info *sta,
303 struct ieee80211_hdr *hdr)
304{
305 enum nl80211_mesh_power_mode pm;
306
307 if (ieee80211_has_pm(hdr->frame_control))
308 pm = NL80211_MESH_POWER_DEEP_SLEEP;
309 else
310 pm = NL80211_MESH_POWER_ACTIVE;
311
312 if (sta->nonpeer_pm == pm)
313 return;
314
315 mps_dbg(sta->sdata, "STA %pM sets non-peer mode to %d\n",
316 sta->sta.addr, pm);
317
318 sta->nonpeer_pm = pm;
319
320 ieee80211_mps_sta_status_update(sta);
321}
322
323/**
324 * ieee80211_mps_rx_h_sta_process - frame receive handler for mesh powersave
325 *
326 * @sta: STA info that transmitted the frame
327 * @hdr: IEEE 802.11 (QoS) Header
328 */
329void ieee80211_mps_rx_h_sta_process(struct sta_info *sta,
330 struct ieee80211_hdr *hdr)
331{
332 if (is_unicast_ether_addr(hdr->addr1) &&
333 ieee80211_is_data_qos(hdr->frame_control)) {
334 /*
335 * individually addressed QoS Data/Null frames contain
336 * peer link-specific PS mode towards the local STA
337 */
338 mps_set_sta_peer_pm(sta, hdr);
339
340 /* check for mesh Peer Service Period trigger frames */
341 ieee80211_mpsp_trigger_process(ieee80211_get_qos_ctl(hdr),
342 sta, false, false);
343 } else {
344 /*
345 * can only determine non-peer PS mode
346 * (see IEEE802.11-2012 8.2.4.1.7)
347 */
348 mps_set_sta_nonpeer_pm(sta, hdr);
349 }
350}
351
352
353/* mesh PS frame release */
354
355static void mpsp_trigger_send(struct sta_info *sta, bool rspi, bool eosp)
356{
357 struct ieee80211_sub_if_data *sdata = sta->sdata;
358 struct sk_buff *skb;
359 struct ieee80211_hdr *nullfunc;
360 struct ieee80211_tx_info *info;
361 u8 *qc;
362
363 skb = mps_qos_null_get(sta);
364 if (!skb)
365 return;
366
367 nullfunc = (struct ieee80211_hdr *) skb->data;
368 if (!eosp)
369 nullfunc->frame_control |=
370 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
371 /*
372 * | RSPI | EOSP | MPSP triggering |
373 * +------+------+--------------------+
374 * | 0 | 0 | local STA is owner |
375 * | 0 | 1 | no MPSP (MPSP end) |
376 * | 1 | 0 | both STA are owner |
377 * | 1 | 1 | peer STA is owner | see IEEE802.11-2012 13.14.9.2
378 */
379 qc = ieee80211_get_qos_ctl(nullfunc);
380 if (rspi)
381 qc[1] |= (IEEE80211_QOS_CTL_RSPI >> 8);
382 if (eosp)
383 qc[0] |= IEEE80211_QOS_CTL_EOSP;
384
385 info = IEEE80211_SKB_CB(skb);
386
387 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
388 IEEE80211_TX_CTL_REQ_TX_STATUS;
389
390 mps_dbg(sdata, "sending MPSP trigger%s%s to %pM\n",
391 rspi ? " RSPI" : "", eosp ? " EOSP" : "", sta->sta.addr);
392
393 ieee80211_tx_skb(sdata, skb);
394}
395
396/**
397 * mpsp_qos_null_append - append QoS Null frame to MPSP skb queue if needed
398 *
399 * To properly end a mesh MPSP the last transmitted frame has to set the EOSP
400 * flag in the QoS Control field. In case the current tailing frame is not a
401 * QoS Data frame, append a QoS Null to carry the flag.
402 */
403static void mpsp_qos_null_append(struct sta_info *sta,
404 struct sk_buff_head *frames)
405{
406 struct ieee80211_sub_if_data *sdata = sta->sdata;
407 struct sk_buff *new_skb, *skb = skb_peek_tail(frames);
408 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
409 struct ieee80211_tx_info *info;
410
411 if (ieee80211_is_data_qos(hdr->frame_control))
412 return;
413
414 new_skb = mps_qos_null_get(sta);
415 if (!new_skb)
416 return;
417
418 mps_dbg(sdata, "appending QoS Null in MPSP towards %pM\n",
419 sta->sta.addr);
420 /*
421 * This frame has to be transmitted last. Assign lowest priority to
422 * make sure it cannot pass other frames when releasing multiple ACs.
423 */
424 new_skb->priority = 1;
425 skb_set_queue_mapping(new_skb, IEEE80211_AC_BK);
426 ieee80211_set_qos_hdr(sdata, new_skb);
427
428 info = IEEE80211_SKB_CB(new_skb);
429 info->control.vif = &sdata->vif;
430 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
431
432 __skb_queue_tail(frames, new_skb);
433}
434
435/**
436 * mps_frame_deliver - transmit frames during mesh powersave
437 *
438 * @sta: STA info to transmit to
439 * @n_frames: number of frames to transmit. -1 for all
440 */
441static void mps_frame_deliver(struct sta_info *sta, int n_frames)
442{
443 struct ieee80211_sub_if_data *sdata = sta->sdata;
444 struct ieee80211_local *local = sdata->local;
445 int ac;
446 struct sk_buff_head frames;
447 struct sk_buff *skb;
448 bool more_data = false;
449
450 skb_queue_head_init(&frames);
451
452 /* collect frame(s) from buffers */
453 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
454 while (n_frames != 0) {
455 skb = skb_dequeue(&sta->tx_filtered[ac]);
456 if (!skb) {
457 skb = skb_dequeue(
458 &sta->ps_tx_buf[ac]);
459 if (skb)
460 local->total_ps_buffered--;
461 }
462 if (!skb)
463 break;
464 n_frames--;
465 __skb_queue_tail(&frames, skb);
466 }
467
468 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
469 !skb_queue_empty(&sta->ps_tx_buf[ac]))
470 more_data = true;
471 }
472
473 /* nothing to send? -> EOSP */
474 if (skb_queue_empty(&frames)) {
475 mpsp_trigger_send(sta, false, true);
476 return;
477 }
478
479 /* in a MPSP make sure the last skb is a QoS Data frame */
480 if (test_sta_flag(sta, WLAN_STA_MPSP_OWNER))
481 mpsp_qos_null_append(sta, &frames);
482
483 mps_dbg(sta->sdata, "sending %d frames to PS STA %pM\n",
484 skb_queue_len(&frames), sta->sta.addr);
485
486 /* prepare collected frames for transmission */
487 skb_queue_walk(&frames, skb) {
488 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
489 struct ieee80211_hdr *hdr = (void *) skb->data;
490
491 /*
492 * Tell TX path to send this frame even though the
493 * STA may still remain is PS mode after this frame
494 * exchange.
495 */
496 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
497
498 if (more_data || !skb_queue_is_last(&frames, skb))
499 hdr->frame_control |=
500 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
501 else
502 hdr->frame_control &=
503 cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
504
505 if (skb_queue_is_last(&frames, skb) &&
506 ieee80211_is_data_qos(hdr->frame_control)) {
507 u8 *qoshdr = ieee80211_get_qos_ctl(hdr);
508
509 /* MPSP trigger frame ends service period */
510 *qoshdr |= IEEE80211_QOS_CTL_EOSP;
511 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
512 }
513 }
514
515 ieee80211_add_pending_skbs(local, &frames);
516 sta_info_recalc_tim(sta);
517}
518
519/**
520 * ieee80211_mpsp_trigger_process - track status of mesh Peer Service Periods
521 *
522 * @qc: QoS Control field
523 * @sta: peer to start a MPSP with
524 * @tx: frame was transmitted by the local STA
525 * @acked: frame has been transmitted successfully
526 *
527 * NOTE: active mode STA may only serve as MPSP owner
528 */
529void ieee80211_mpsp_trigger_process(u8 *qc, struct sta_info *sta,
530 bool tx, bool acked)
531{
532 u8 rspi = qc[1] & (IEEE80211_QOS_CTL_RSPI >> 8);
533 u8 eosp = qc[0] & IEEE80211_QOS_CTL_EOSP;
534
535 if (tx) {
536 if (rspi && acked)
537 set_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
538
539 if (eosp)
540 clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
541 else if (acked &&
542 test_sta_flag(sta, WLAN_STA_PS_STA) &&
543 !test_and_set_sta_flag(sta, WLAN_STA_MPSP_OWNER))
544 mps_frame_deliver(sta, -1);
545 } else {
546 if (eosp)
547 clear_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
548 else if (sta->local_pm != NL80211_MESH_POWER_ACTIVE)
549 set_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
550
551 if (rspi && !test_and_set_sta_flag(sta, WLAN_STA_MPSP_OWNER))
552 mps_frame_deliver(sta, -1);
553 }
554}
555
556/**
557 * ieee80211_mps_frame_release - release buffered frames in response to beacon
558 *
559 * @sta: mesh STA
560 * @elems: beacon IEs
561 *
562 * For peers if we have individually-addressed frames buffered or the peer
563 * indicates buffered frames, send a corresponding MPSP trigger frame. Since
564 * we do not evaluate the awake window duration, QoS Nulls are used as MPSP
565 * trigger frames. If the neighbour STA is not a peer, only send single frames.
566 */
567void ieee80211_mps_frame_release(struct sta_info *sta,
568 struct ieee802_11_elems *elems)
569{
570 int ac, buffer_local = 0;
571 bool has_buffered = false;
572
573 /* TIM map only for LLID <= IEEE80211_MAX_AID */
574 if (sta->plink_state == NL80211_PLINK_ESTAB)
575 has_buffered = ieee80211_check_tim(elems->tim, elems->tim_len,
576 le16_to_cpu(sta->llid) % IEEE80211_MAX_AID);
577
578 if (has_buffered)
579 mps_dbg(sta->sdata, "%pM indicates buffered frames\n",
580 sta->sta.addr);
581
582 /* only transmit to PS STA with announced, non-zero awake window */
583 if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
584 (!elems->awake_window || !le16_to_cpu(*elems->awake_window)))
585 return;
586
587 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
588 buffer_local += skb_queue_len(&sta->ps_tx_buf[ac]) +
589 skb_queue_len(&sta->tx_filtered[ac]);
590
591 if (!has_buffered && !buffer_local)
592 return;
593
594 if (sta->plink_state == NL80211_PLINK_ESTAB)
595 mpsp_trigger_send(sta, has_buffered, !buffer_local);
596 else
597 mps_frame_deliver(sta, 1);
598}