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3f52b7e3 MP |
1 | /* |
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 | */ | |
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 = (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 | */ | |
50 | static 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 | |
77 | */ | |
78 | void 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 | ||
86 | rcu_read_lock(); | |
87 | list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { | |
88 | if (sdata != sta->sdata) | |
89 | continue; | |
90 | ||
91 | switch (sta->plink_state) { | |
92 | case NL80211_PLINK_OPN_SNT: | |
93 | case NL80211_PLINK_OPN_RCVD: | |
94 | case NL80211_PLINK_CNF_RCVD: | |
95 | peering = true; | |
96 | break; | |
97 | case NL80211_PLINK_ESTAB: | |
98 | if (sta->local_pm == NL80211_MESH_POWER_LIGHT_SLEEP) | |
99 | light_sleep_cnt++; | |
100 | else if (sta->local_pm == NL80211_MESH_POWER_DEEP_SLEEP) | |
101 | deep_sleep_cnt++; | |
102 | break; | |
103 | default: | |
104 | break; | |
105 | } | |
106 | } | |
107 | rcu_read_unlock(); | |
108 | ||
109 | /* | |
110 | * Set non-peer mode to active during peering/scanning/authentication | |
111 | * (see IEEE802.11-2012 13.14.8.3). The non-peer mesh power mode is | |
112 | * deep sleep if the local STA is in light or deep sleep towards at | |
113 | * least one mesh peer (see 13.14.3.1). Otherwise, set it to the | |
114 | * user-configured default value. | |
115 | */ | |
116 | if (peering) { | |
117 | mps_dbg(sdata, "setting non-peer PM to active for peering\n"); | |
118 | ifmsh->nonpeer_pm = NL80211_MESH_POWER_ACTIVE; | |
119 | } else if (light_sleep_cnt || deep_sleep_cnt) { | |
120 | mps_dbg(sdata, "setting non-peer PM to deep sleep\n"); | |
121 | ifmsh->nonpeer_pm = NL80211_MESH_POWER_DEEP_SLEEP; | |
122 | } else { | |
123 | mps_dbg(sdata, "setting non-peer PM to user value\n"); | |
124 | ifmsh->nonpeer_pm = ifmsh->mshcfg.power_mode; | |
125 | } | |
126 | ||
127 | ifmsh->ps_peers_light_sleep = light_sleep_cnt; | |
128 | ifmsh->ps_peers_deep_sleep = deep_sleep_cnt; | |
129 | } | |
130 | ||
131 | /** | |
132 | * ieee80211_mps_set_sta_local_pm - set local PM towards a mesh STA | |
133 | * | |
134 | * @sta: mesh STA | |
135 | * @pm: the power mode to set | |
136 | */ | |
137 | void ieee80211_mps_set_sta_local_pm(struct sta_info *sta, | |
138 | enum nl80211_mesh_power_mode pm) | |
139 | { | |
140 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
141 | ||
142 | mps_dbg(sdata, "local STA operates in mode %d with %pM\n", | |
143 | pm, sta->sta.addr); | |
144 | ||
145 | sta->local_pm = pm; | |
146 | ||
147 | /* | |
148 | * announce peer-specific power mode transition | |
149 | * (see IEEE802.11-2012 13.14.3.2 and 13.14.3.3) | |
150 | */ | |
151 | if (sta->plink_state == NL80211_PLINK_ESTAB) | |
152 | mps_qos_null_tx(sta); | |
153 | ||
154 | ieee80211_mps_local_status_update(sdata); | |
155 | } | |
156 | ||
157 | /** | |
158 | * ieee80211_mps_set_frame_flags - set mesh PS flags in FC (and QoS Control) | |
159 | * | |
160 | * @sdata: local mesh subif | |
161 | * @sta: mesh STA | |
162 | * @hdr: 802.11 frame header | |
163 | * | |
164 | * see IEEE802.11-2012 8.2.4.1.7 and 8.2.4.5.11 | |
165 | * | |
166 | * NOTE: sta must be given when an individually-addressed QoS frame header | |
167 | * is handled, for group-addressed and management frames it is not used | |
168 | */ | |
169 | void ieee80211_mps_set_frame_flags(struct ieee80211_sub_if_data *sdata, | |
170 | struct sta_info *sta, | |
171 | struct ieee80211_hdr *hdr) | |
172 | { | |
173 | enum nl80211_mesh_power_mode pm; | |
174 | u8 *qc; | |
175 | ||
176 | if (WARN_ON(is_unicast_ether_addr(hdr->addr1) && | |
177 | ieee80211_is_data_qos(hdr->frame_control) && | |
178 | !sta)) | |
179 | return; | |
180 | ||
181 | if (is_unicast_ether_addr(hdr->addr1) && | |
182 | ieee80211_is_data_qos(hdr->frame_control) && | |
183 | sta->plink_state == NL80211_PLINK_ESTAB) | |
184 | pm = sta->local_pm; | |
185 | else | |
186 | pm = sdata->u.mesh.nonpeer_pm; | |
187 | ||
188 | if (pm == NL80211_MESH_POWER_ACTIVE) | |
189 | hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_PM); | |
190 | else | |
191 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); | |
192 | ||
193 | if (!ieee80211_is_data_qos(hdr->frame_control)) | |
194 | return; | |
195 | ||
196 | qc = ieee80211_get_qos_ctl(hdr); | |
197 | ||
198 | if ((is_unicast_ether_addr(hdr->addr1) && | |
199 | pm == NL80211_MESH_POWER_DEEP_SLEEP) || | |
200 | (is_multicast_ether_addr(hdr->addr1) && | |
201 | sdata->u.mesh.ps_peers_deep_sleep > 0)) | |
202 | qc[1] |= (IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8); | |
203 | else | |
204 | qc[1] &= ~(IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8); | |
205 | } | |
206 | ||
207 | /** | |
208 | * ieee80211_mps_sta_status_update - update buffering status of neighbor STA | |
209 | * | |
210 | * @sta: mesh STA | |
211 | * | |
212 | * called after change of peering status or non-peer/peer-specific power mode | |
213 | */ | |
214 | void ieee80211_mps_sta_status_update(struct sta_info *sta) | |
215 | { | |
216 | enum nl80211_mesh_power_mode pm; | |
217 | bool do_buffer; | |
218 | ||
219 | /* | |
220 | * use peer-specific power mode if peering is established and the | |
221 | * peer's power mode is known | |
222 | */ | |
223 | if (sta->plink_state == NL80211_PLINK_ESTAB && | |
224 | sta->peer_pm != NL80211_MESH_POWER_UNKNOWN) | |
225 | pm = sta->peer_pm; | |
226 | else | |
227 | pm = sta->nonpeer_pm; | |
228 | ||
229 | do_buffer = (pm != NL80211_MESH_POWER_ACTIVE); | |
230 | ||
231 | /* Don't let the same PS state be set twice */ | |
232 | if (test_sta_flag(sta, WLAN_STA_PS_STA) == do_buffer) | |
233 | return; | |
234 | ||
235 | if (do_buffer) { | |
236 | set_sta_flag(sta, WLAN_STA_PS_STA); | |
237 | atomic_inc(&sta->sdata->u.mesh.ps.num_sta_ps); | |
238 | mps_dbg(sta->sdata, "start PS buffering frames towards %pM\n", | |
239 | sta->sta.addr); | |
240 | } else { | |
241 | ieee80211_sta_ps_deliver_wakeup(sta); | |
242 | } | |
243 | ||
244 | /* clear the MPSP flags for non-peers or active STA */ | |
245 | if (sta->plink_state != NL80211_PLINK_ESTAB) { | |
246 | clear_sta_flag(sta, WLAN_STA_MPSP_OWNER); | |
247 | clear_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT); | |
248 | } else if (!do_buffer) { | |
249 | clear_sta_flag(sta, WLAN_STA_MPSP_OWNER); | |
250 | } | |
251 | } | |
252 | ||
253 | static void mps_set_sta_peer_pm(struct sta_info *sta, | |
254 | struct ieee80211_hdr *hdr) | |
255 | { | |
256 | enum nl80211_mesh_power_mode pm; | |
257 | u8 *qc = ieee80211_get_qos_ctl(hdr); | |
258 | ||
259 | /* | |
260 | * Test Power Management field of frame control (PW) and | |
261 | * mesh power save level subfield of QoS control field (PSL) | |
262 | * | |
263 | * | PM | PSL| Mesh PM | | |
264 | * +----+----+---------+ | |
265 | * | 0 |Rsrv| Active | | |
266 | * | 1 | 0 | Light | | |
267 | * | 1 | 1 | Deep | | |
268 | */ | |
269 | if (ieee80211_has_pm(hdr->frame_control)) { | |
270 | if (qc[1] & (IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8)) | |
271 | pm = NL80211_MESH_POWER_DEEP_SLEEP; | |
272 | else | |
273 | pm = NL80211_MESH_POWER_LIGHT_SLEEP; | |
274 | } else { | |
275 | pm = NL80211_MESH_POWER_ACTIVE; | |
276 | } | |
277 | ||
278 | if (sta->peer_pm == pm) | |
279 | return; | |
280 | ||
281 | mps_dbg(sta->sdata, "STA %pM enters mode %d\n", | |
282 | sta->sta.addr, pm); | |
283 | ||
284 | sta->peer_pm = pm; | |
285 | ||
286 | ieee80211_mps_sta_status_update(sta); | |
287 | } | |
288 | ||
289 | static void mps_set_sta_nonpeer_pm(struct sta_info *sta, | |
290 | struct ieee80211_hdr *hdr) | |
291 | { | |
292 | enum nl80211_mesh_power_mode pm; | |
293 | ||
294 | if (ieee80211_has_pm(hdr->frame_control)) | |
295 | pm = NL80211_MESH_POWER_DEEP_SLEEP; | |
296 | else | |
297 | pm = NL80211_MESH_POWER_ACTIVE; | |
298 | ||
299 | if (sta->nonpeer_pm == pm) | |
300 | return; | |
301 | ||
302 | mps_dbg(sta->sdata, "STA %pM sets non-peer mode to %d\n", | |
303 | sta->sta.addr, pm); | |
304 | ||
305 | sta->nonpeer_pm = pm; | |
306 | ||
307 | ieee80211_mps_sta_status_update(sta); | |
308 | } | |
309 | ||
310 | /** | |
311 | * ieee80211_mps_rx_h_sta_process - frame receive handler for mesh powersave | |
312 | * | |
313 | * @sta: STA info that transmitted the frame | |
314 | * @hdr: IEEE 802.11 (QoS) Header | |
315 | */ | |
316 | void ieee80211_mps_rx_h_sta_process(struct sta_info *sta, | |
317 | struct ieee80211_hdr *hdr) | |
318 | { | |
319 | if (is_unicast_ether_addr(hdr->addr1) && | |
320 | ieee80211_is_data_qos(hdr->frame_control)) { | |
321 | /* | |
322 | * individually addressed QoS Data/Null frames contain | |
323 | * peer link-specific PS mode towards the local STA | |
324 | */ | |
325 | mps_set_sta_peer_pm(sta, hdr); | |
326 | ||
327 | /* check for mesh Peer Service Period trigger frames */ | |
328 | ieee80211_mpsp_trigger_process(ieee80211_get_qos_ctl(hdr), | |
329 | sta, false, false); | |
330 | } else { | |
331 | /* | |
332 | * can only determine non-peer PS mode | |
333 | * (see IEEE802.11-2012 8.2.4.1.7) | |
334 | */ | |
335 | mps_set_sta_nonpeer_pm(sta, hdr); | |
336 | } | |
337 | } | |
338 | ||
339 | ||
340 | /* mesh PS frame release */ | |
341 | ||
342 | static void mpsp_trigger_send(struct sta_info *sta, bool rspi, bool eosp) | |
343 | { | |
344 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
345 | struct sk_buff *skb; | |
346 | struct ieee80211_hdr *nullfunc; | |
347 | struct ieee80211_tx_info *info; | |
348 | u8 *qc; | |
349 | ||
350 | skb = mps_qos_null_get(sta); | |
351 | if (!skb) | |
352 | return; | |
353 | ||
354 | nullfunc = (struct ieee80211_hdr *) skb->data; | |
355 | if (!eosp) | |
356 | nullfunc->frame_control |= | |
357 | cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
358 | /* | |
359 | * | RSPI | EOSP | MPSP triggering | | |
360 | * +------+------+--------------------+ | |
361 | * | 0 | 0 | local STA is owner | | |
362 | * | 0 | 1 | no MPSP (MPSP end) | | |
363 | * | 1 | 0 | both STA are owner | | |
364 | * | 1 | 1 | peer STA is owner | see IEEE802.11-2012 13.14.9.2 | |
365 | */ | |
366 | qc = ieee80211_get_qos_ctl(nullfunc); | |
367 | if (rspi) | |
368 | qc[1] |= (IEEE80211_QOS_CTL_RSPI >> 8); | |
369 | if (eosp) | |
370 | qc[0] |= IEEE80211_QOS_CTL_EOSP; | |
371 | ||
372 | info = IEEE80211_SKB_CB(skb); | |
373 | ||
374 | info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER | | |
375 | IEEE80211_TX_CTL_REQ_TX_STATUS; | |
376 | ||
377 | mps_dbg(sdata, "sending MPSP trigger%s%s to %pM\n", | |
378 | rspi ? " RSPI" : "", eosp ? " EOSP" : "", sta->sta.addr); | |
379 | ||
380 | ieee80211_tx_skb(sdata, skb); | |
381 | } | |
382 | ||
383 | /** | |
384 | * mpsp_qos_null_append - append QoS Null frame to MPSP skb queue if needed | |
385 | * | |
386 | * To properly end a mesh MPSP the last transmitted frame has to set the EOSP | |
387 | * flag in the QoS Control field. In case the current tailing frame is not a | |
388 | * QoS Data frame, append a QoS Null to carry the flag. | |
389 | */ | |
390 | static void mpsp_qos_null_append(struct sta_info *sta, | |
391 | struct sk_buff_head *frames) | |
392 | { | |
393 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
394 | struct sk_buff *new_skb, *skb = skb_peek_tail(frames); | |
395 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
396 | struct ieee80211_tx_info *info; | |
397 | ||
398 | if (ieee80211_is_data_qos(hdr->frame_control)) | |
399 | return; | |
400 | ||
401 | new_skb = mps_qos_null_get(sta); | |
402 | if (!new_skb) | |
403 | return; | |
404 | ||
405 | mps_dbg(sdata, "appending QoS Null in MPSP towards %pM\n", | |
406 | sta->sta.addr); | |
407 | /* | |
408 | * This frame has to be transmitted last. Assign lowest priority to | |
409 | * make sure it cannot pass other frames when releasing multiple ACs. | |
410 | */ | |
411 | new_skb->priority = 1; | |
412 | skb_set_queue_mapping(new_skb, IEEE80211_AC_BK); | |
413 | ieee80211_set_qos_hdr(sdata, new_skb); | |
414 | ||
415 | info = IEEE80211_SKB_CB(new_skb); | |
416 | info->control.vif = &sdata->vif; | |
417 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
418 | ||
419 | __skb_queue_tail(frames, new_skb); | |
420 | } | |
421 | ||
422 | /** | |
423 | * mps_frame_deliver - transmit frames during mesh powersave | |
424 | * | |
425 | * @sta: STA info to transmit to | |
426 | * @n_frames: number of frames to transmit. -1 for all | |
427 | */ | |
428 | static void mps_frame_deliver(struct sta_info *sta, int n_frames) | |
429 | { | |
430 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
431 | struct ieee80211_local *local = sdata->local; | |
432 | int ac; | |
433 | struct sk_buff_head frames; | |
434 | struct sk_buff *skb; | |
435 | bool more_data = false; | |
436 | ||
437 | skb_queue_head_init(&frames); | |
438 | ||
439 | /* collect frame(s) from buffers */ | |
440 | for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { | |
441 | while (n_frames != 0) { | |
442 | skb = skb_dequeue(&sta->tx_filtered[ac]); | |
443 | if (!skb) { | |
444 | skb = skb_dequeue( | |
445 | &sta->ps_tx_buf[ac]); | |
446 | if (skb) | |
447 | local->total_ps_buffered--; | |
448 | } | |
449 | if (!skb) | |
450 | break; | |
451 | n_frames--; | |
452 | __skb_queue_tail(&frames, skb); | |
453 | } | |
454 | ||
455 | if (!skb_queue_empty(&sta->tx_filtered[ac]) || | |
456 | !skb_queue_empty(&sta->ps_tx_buf[ac])) | |
457 | more_data = true; | |
458 | } | |
459 | ||
460 | /* nothing to send? -> EOSP */ | |
461 | if (skb_queue_empty(&frames)) { | |
462 | mpsp_trigger_send(sta, false, true); | |
463 | return; | |
464 | } | |
465 | ||
466 | /* in a MPSP make sure the last skb is a QoS Data frame */ | |
467 | if (test_sta_flag(sta, WLAN_STA_MPSP_OWNER)) | |
468 | mpsp_qos_null_append(sta, &frames); | |
469 | ||
470 | mps_dbg(sta->sdata, "sending %d frames to PS STA %pM\n", | |
471 | skb_queue_len(&frames), sta->sta.addr); | |
472 | ||
473 | /* prepare collected frames for transmission */ | |
474 | skb_queue_walk(&frames, skb) { | |
475 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
476 | struct ieee80211_hdr *hdr = (void *) skb->data; | |
477 | ||
478 | /* | |
479 | * Tell TX path to send this frame even though the | |
480 | * STA may still remain is PS mode after this frame | |
481 | * exchange. | |
482 | */ | |
483 | info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; | |
484 | ||
485 | if (more_data || !skb_queue_is_last(&frames, skb)) | |
486 | hdr->frame_control |= | |
487 | cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
488 | else | |
489 | hdr->frame_control &= | |
490 | cpu_to_le16(~IEEE80211_FCTL_MOREDATA); | |
491 | ||
492 | if (skb_queue_is_last(&frames, skb) && | |
493 | ieee80211_is_data_qos(hdr->frame_control)) { | |
494 | u8 *qoshdr = ieee80211_get_qos_ctl(hdr); | |
495 | ||
496 | /* MPSP trigger frame ends service period */ | |
497 | *qoshdr |= IEEE80211_QOS_CTL_EOSP; | |
498 | info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; | |
499 | } | |
500 | } | |
501 | ||
502 | ieee80211_add_pending_skbs(local, &frames); | |
503 | sta_info_recalc_tim(sta); | |
504 | } | |
505 | ||
506 | /** | |
507 | * ieee80211_mpsp_trigger_process - track status of mesh Peer Service Periods | |
508 | * | |
509 | * @qc: QoS Control field | |
510 | * @sta: peer to start a MPSP with | |
511 | * @tx: frame was transmitted by the local STA | |
512 | * @acked: frame has been transmitted successfully | |
513 | * | |
514 | * NOTE: active mode STA may only serve as MPSP owner | |
515 | */ | |
516 | void ieee80211_mpsp_trigger_process(u8 *qc, struct sta_info *sta, | |
517 | bool tx, bool acked) | |
518 | { | |
519 | u8 rspi = qc[1] & (IEEE80211_QOS_CTL_RSPI >> 8); | |
520 | u8 eosp = qc[0] & IEEE80211_QOS_CTL_EOSP; | |
521 | ||
522 | if (tx) { | |
523 | if (rspi && acked) | |
524 | set_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT); | |
525 | ||
526 | if (eosp) | |
527 | clear_sta_flag(sta, WLAN_STA_MPSP_OWNER); | |
528 | else if (acked && | |
529 | test_sta_flag(sta, WLAN_STA_PS_STA) && | |
530 | !test_and_set_sta_flag(sta, WLAN_STA_MPSP_OWNER)) | |
531 | mps_frame_deliver(sta, -1); | |
532 | } else { | |
533 | if (eosp) | |
534 | clear_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT); | |
535 | else if (sta->local_pm != NL80211_MESH_POWER_ACTIVE) | |
536 | set_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT); | |
537 | ||
538 | if (rspi && !test_and_set_sta_flag(sta, WLAN_STA_MPSP_OWNER)) | |
539 | mps_frame_deliver(sta, -1); | |
540 | } | |
541 | } | |
542 | ||
543 | /** | |
544 | * ieee80211_mps_frame_release - release buffered frames in response to beacon | |
545 | * | |
546 | * @sta: mesh STA | |
547 | * @elems: beacon IEs | |
548 | * | |
549 | * For peers if we have individually-addressed frames buffered or the peer | |
550 | * indicates buffered frames, send a corresponding MPSP trigger frame. Since | |
551 | * we do not evaluate the awake window duration, QoS Nulls are used as MPSP | |
552 | * trigger frames. If the neighbour STA is not a peer, only send single frames. | |
553 | */ | |
554 | void ieee80211_mps_frame_release(struct sta_info *sta, | |
555 | struct ieee802_11_elems *elems) | |
556 | { | |
557 | int ac, buffer_local = 0; | |
558 | bool has_buffered = false; | |
559 | ||
560 | /* TIM map only for LLID <= IEEE80211_MAX_AID */ | |
561 | if (sta->plink_state == NL80211_PLINK_ESTAB) | |
562 | has_buffered = ieee80211_check_tim(elems->tim, elems->tim_len, | |
563 | le16_to_cpu(sta->llid) % IEEE80211_MAX_AID); | |
564 | ||
565 | if (has_buffered) | |
566 | mps_dbg(sta->sdata, "%pM indicates buffered frames\n", | |
567 | sta->sta.addr); | |
568 | ||
569 | /* only transmit to PS STA with announced, non-zero awake window */ | |
570 | if (test_sta_flag(sta, WLAN_STA_PS_STA) && | |
571 | (!elems->awake_window || !le16_to_cpu(*elems->awake_window))) | |
572 | return; | |
573 | ||
574 | for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) | |
575 | buffer_local += skb_queue_len(&sta->ps_tx_buf[ac]) + | |
576 | skb_queue_len(&sta->tx_filtered[ac]); | |
577 | ||
578 | if (!has_buffered && !buffer_local) | |
579 | return; | |
580 | ||
581 | if (sta->plink_state == NL80211_PLINK_ESTAB) | |
582 | mpsp_trigger_send(sta, has_buffered, !buffer_local); | |
583 | else | |
584 | mps_frame_deliver(sta, 1); | |
585 | } |