blob: 22290a929b94595445865baecdb692aff5e0be9c [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
Chun-Yeow Yeoh40d18ff2013-07-19 17:37:39 +0800232 /* For non-assoc STA, prevent buffering or frame transmission */
233 if (sta->sta_state < IEEE80211_STA_ASSOC)
234 return;
235
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100236 /*
237 * use peer-specific power mode if peering is established and the
238 * peer's power mode is known
239 */
240 if (sta->plink_state == NL80211_PLINK_ESTAB &&
241 sta->peer_pm != NL80211_MESH_POWER_UNKNOWN)
242 pm = sta->peer_pm;
243 else
244 pm = sta->nonpeer_pm;
245
246 do_buffer = (pm != NL80211_MESH_POWER_ACTIVE);
247
248 /* Don't let the same PS state be set twice */
249 if (test_sta_flag(sta, WLAN_STA_PS_STA) == do_buffer)
250 return;
251
252 if (do_buffer) {
253 set_sta_flag(sta, WLAN_STA_PS_STA);
254 atomic_inc(&sta->sdata->u.mesh.ps.num_sta_ps);
255 mps_dbg(sta->sdata, "start PS buffering frames towards %pM\n",
256 sta->sta.addr);
257 } else {
258 ieee80211_sta_ps_deliver_wakeup(sta);
259 }
260
261 /* clear the MPSP flags for non-peers or active STA */
262 if (sta->plink_state != NL80211_PLINK_ESTAB) {
263 clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
264 clear_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
265 } else if (!do_buffer) {
266 clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
267 }
268}
269
270static void mps_set_sta_peer_pm(struct sta_info *sta,
271 struct ieee80211_hdr *hdr)
272{
273 enum nl80211_mesh_power_mode pm;
274 u8 *qc = ieee80211_get_qos_ctl(hdr);
275
276 /*
277 * Test Power Management field of frame control (PW) and
278 * mesh power save level subfield of QoS control field (PSL)
279 *
280 * | PM | PSL| Mesh PM |
281 * +----+----+---------+
282 * | 0 |Rsrv| Active |
283 * | 1 | 0 | Light |
284 * | 1 | 1 | Deep |
285 */
286 if (ieee80211_has_pm(hdr->frame_control)) {
287 if (qc[1] & (IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8))
288 pm = NL80211_MESH_POWER_DEEP_SLEEP;
289 else
290 pm = NL80211_MESH_POWER_LIGHT_SLEEP;
291 } else {
292 pm = NL80211_MESH_POWER_ACTIVE;
293 }
294
295 if (sta->peer_pm == pm)
296 return;
297
298 mps_dbg(sta->sdata, "STA %pM enters mode %d\n",
299 sta->sta.addr, pm);
300
301 sta->peer_pm = pm;
302
303 ieee80211_mps_sta_status_update(sta);
304}
305
306static void mps_set_sta_nonpeer_pm(struct sta_info *sta,
307 struct ieee80211_hdr *hdr)
308{
309 enum nl80211_mesh_power_mode pm;
310
311 if (ieee80211_has_pm(hdr->frame_control))
312 pm = NL80211_MESH_POWER_DEEP_SLEEP;
313 else
314 pm = NL80211_MESH_POWER_ACTIVE;
315
316 if (sta->nonpeer_pm == pm)
317 return;
318
319 mps_dbg(sta->sdata, "STA %pM sets non-peer mode to %d\n",
320 sta->sta.addr, pm);
321
322 sta->nonpeer_pm = pm;
323
324 ieee80211_mps_sta_status_update(sta);
325}
326
327/**
328 * ieee80211_mps_rx_h_sta_process - frame receive handler for mesh powersave
329 *
330 * @sta: STA info that transmitted the frame
331 * @hdr: IEEE 802.11 (QoS) Header
332 */
333void ieee80211_mps_rx_h_sta_process(struct sta_info *sta,
334 struct ieee80211_hdr *hdr)
335{
336 if (is_unicast_ether_addr(hdr->addr1) &&
337 ieee80211_is_data_qos(hdr->frame_control)) {
338 /*
339 * individually addressed QoS Data/Null frames contain
340 * peer link-specific PS mode towards the local STA
341 */
342 mps_set_sta_peer_pm(sta, hdr);
343
344 /* check for mesh Peer Service Period trigger frames */
345 ieee80211_mpsp_trigger_process(ieee80211_get_qos_ctl(hdr),
346 sta, false, false);
347 } else {
348 /*
349 * can only determine non-peer PS mode
350 * (see IEEE802.11-2012 8.2.4.1.7)
351 */
352 mps_set_sta_nonpeer_pm(sta, hdr);
353 }
354}
355
356
357/* mesh PS frame release */
358
359static void mpsp_trigger_send(struct sta_info *sta, bool rspi, bool eosp)
360{
361 struct ieee80211_sub_if_data *sdata = sta->sdata;
362 struct sk_buff *skb;
363 struct ieee80211_hdr *nullfunc;
364 struct ieee80211_tx_info *info;
365 u8 *qc;
366
367 skb = mps_qos_null_get(sta);
368 if (!skb)
369 return;
370
371 nullfunc = (struct ieee80211_hdr *) skb->data;
372 if (!eosp)
373 nullfunc->frame_control |=
374 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
375 /*
376 * | RSPI | EOSP | MPSP triggering |
377 * +------+------+--------------------+
378 * | 0 | 0 | local STA is owner |
379 * | 0 | 1 | no MPSP (MPSP end) |
380 * | 1 | 0 | both STA are owner |
381 * | 1 | 1 | peer STA is owner | see IEEE802.11-2012 13.14.9.2
382 */
383 qc = ieee80211_get_qos_ctl(nullfunc);
384 if (rspi)
385 qc[1] |= (IEEE80211_QOS_CTL_RSPI >> 8);
386 if (eosp)
387 qc[0] |= IEEE80211_QOS_CTL_EOSP;
388
389 info = IEEE80211_SKB_CB(skb);
390
391 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
392 IEEE80211_TX_CTL_REQ_TX_STATUS;
393
394 mps_dbg(sdata, "sending MPSP trigger%s%s to %pM\n",
395 rspi ? " RSPI" : "", eosp ? " EOSP" : "", sta->sta.addr);
396
397 ieee80211_tx_skb(sdata, skb);
398}
399
400/**
401 * mpsp_qos_null_append - append QoS Null frame to MPSP skb queue if needed
402 *
403 * To properly end a mesh MPSP the last transmitted frame has to set the EOSP
404 * flag in the QoS Control field. In case the current tailing frame is not a
405 * QoS Data frame, append a QoS Null to carry the flag.
406 */
407static void mpsp_qos_null_append(struct sta_info *sta,
408 struct sk_buff_head *frames)
409{
410 struct ieee80211_sub_if_data *sdata = sta->sdata;
411 struct sk_buff *new_skb, *skb = skb_peek_tail(frames);
412 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
413 struct ieee80211_tx_info *info;
414
415 if (ieee80211_is_data_qos(hdr->frame_control))
416 return;
417
418 new_skb = mps_qos_null_get(sta);
419 if (!new_skb)
420 return;
421
422 mps_dbg(sdata, "appending QoS Null in MPSP towards %pM\n",
423 sta->sta.addr);
424 /*
425 * This frame has to be transmitted last. Assign lowest priority to
426 * make sure it cannot pass other frames when releasing multiple ACs.
427 */
428 new_skb->priority = 1;
429 skb_set_queue_mapping(new_skb, IEEE80211_AC_BK);
430 ieee80211_set_qos_hdr(sdata, new_skb);
431
432 info = IEEE80211_SKB_CB(new_skb);
433 info->control.vif = &sdata->vif;
434 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
435
436 __skb_queue_tail(frames, new_skb);
437}
438
439/**
440 * mps_frame_deliver - transmit frames during mesh powersave
441 *
442 * @sta: STA info to transmit to
443 * @n_frames: number of frames to transmit. -1 for all
444 */
445static void mps_frame_deliver(struct sta_info *sta, int n_frames)
446{
447 struct ieee80211_sub_if_data *sdata = sta->sdata;
448 struct ieee80211_local *local = sdata->local;
449 int ac;
450 struct sk_buff_head frames;
451 struct sk_buff *skb;
452 bool more_data = false;
453
454 skb_queue_head_init(&frames);
455
456 /* collect frame(s) from buffers */
457 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
458 while (n_frames != 0) {
459 skb = skb_dequeue(&sta->tx_filtered[ac]);
460 if (!skb) {
461 skb = skb_dequeue(
462 &sta->ps_tx_buf[ac]);
463 if (skb)
464 local->total_ps_buffered--;
465 }
466 if (!skb)
467 break;
468 n_frames--;
469 __skb_queue_tail(&frames, skb);
470 }
471
472 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
473 !skb_queue_empty(&sta->ps_tx_buf[ac]))
474 more_data = true;
475 }
476
477 /* nothing to send? -> EOSP */
478 if (skb_queue_empty(&frames)) {
479 mpsp_trigger_send(sta, false, true);
480 return;
481 }
482
483 /* in a MPSP make sure the last skb is a QoS Data frame */
484 if (test_sta_flag(sta, WLAN_STA_MPSP_OWNER))
485 mpsp_qos_null_append(sta, &frames);
486
487 mps_dbg(sta->sdata, "sending %d frames to PS STA %pM\n",
488 skb_queue_len(&frames), sta->sta.addr);
489
490 /* prepare collected frames for transmission */
491 skb_queue_walk(&frames, skb) {
492 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
493 struct ieee80211_hdr *hdr = (void *) skb->data;
494
495 /*
496 * Tell TX path to send this frame even though the
497 * STA may still remain is PS mode after this frame
498 * exchange.
499 */
500 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
501
502 if (more_data || !skb_queue_is_last(&frames, skb))
503 hdr->frame_control |=
504 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
505 else
506 hdr->frame_control &=
507 cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
508
509 if (skb_queue_is_last(&frames, skb) &&
510 ieee80211_is_data_qos(hdr->frame_control)) {
511 u8 *qoshdr = ieee80211_get_qos_ctl(hdr);
512
513 /* MPSP trigger frame ends service period */
514 *qoshdr |= IEEE80211_QOS_CTL_EOSP;
515 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
516 }
517 }
518
519 ieee80211_add_pending_skbs(local, &frames);
520 sta_info_recalc_tim(sta);
521}
522
523/**
524 * ieee80211_mpsp_trigger_process - track status of mesh Peer Service Periods
525 *
526 * @qc: QoS Control field
527 * @sta: peer to start a MPSP with
528 * @tx: frame was transmitted by the local STA
529 * @acked: frame has been transmitted successfully
530 *
531 * NOTE: active mode STA may only serve as MPSP owner
532 */
533void ieee80211_mpsp_trigger_process(u8 *qc, struct sta_info *sta,
534 bool tx, bool acked)
535{
536 u8 rspi = qc[1] & (IEEE80211_QOS_CTL_RSPI >> 8);
537 u8 eosp = qc[0] & IEEE80211_QOS_CTL_EOSP;
538
539 if (tx) {
540 if (rspi && acked)
541 set_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
542
543 if (eosp)
544 clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
545 else if (acked &&
546 test_sta_flag(sta, WLAN_STA_PS_STA) &&
547 !test_and_set_sta_flag(sta, WLAN_STA_MPSP_OWNER))
548 mps_frame_deliver(sta, -1);
549 } else {
550 if (eosp)
551 clear_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
552 else if (sta->local_pm != NL80211_MESH_POWER_ACTIVE)
553 set_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
554
555 if (rspi && !test_and_set_sta_flag(sta, WLAN_STA_MPSP_OWNER))
556 mps_frame_deliver(sta, -1);
557 }
558}
559
560/**
561 * ieee80211_mps_frame_release - release buffered frames in response to beacon
562 *
563 * @sta: mesh STA
564 * @elems: beacon IEs
565 *
566 * For peers if we have individually-addressed frames buffered or the peer
567 * indicates buffered frames, send a corresponding MPSP trigger frame. Since
568 * we do not evaluate the awake window duration, QoS Nulls are used as MPSP
569 * trigger frames. If the neighbour STA is not a peer, only send single frames.
570 */
571void ieee80211_mps_frame_release(struct sta_info *sta,
572 struct ieee802_11_elems *elems)
573{
574 int ac, buffer_local = 0;
575 bool has_buffered = false;
576
577 /* TIM map only for LLID <= IEEE80211_MAX_AID */
578 if (sta->plink_state == NL80211_PLINK_ESTAB)
579 has_buffered = ieee80211_check_tim(elems->tim, elems->tim_len,
580 le16_to_cpu(sta->llid) % IEEE80211_MAX_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 || !le16_to_cpu(*elems->awake_window)))
589 return;
590
591 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
592 buffer_local += skb_queue_len(&sta->ps_tx_buf[ac]) +
593 skb_queue_len(&sta->tx_filtered[ac]);
594
595 if (!has_buffered && !buffer_local)
596 return;
597
598 if (sta->plink_state == NL80211_PLINK_ESTAB)
599 mpsp_trigger_send(sta, has_buffered, !buffer_local);
600 else
601 mps_frame_deliver(sta, 1);
602}