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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 | |
39886b61 | 77 | * Return BSS_CHANGED_BEACON if a beacon update is necessary. |
3f52b7e3 | 78 | */ |
39886b61 | 79 | u32 ieee80211_mps_local_status_update(struct ieee80211_sub_if_data *sdata) |
3f52b7e3 MP |
80 | { |
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; | |
39886b61 TP |
86 | u32 changed = 0; |
87 | enum nl80211_mesh_power_mode nonpeer_pm; | |
3f52b7e3 MP |
88 | |
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"); | |
39886b61 | 121 | nonpeer_pm = NL80211_MESH_POWER_ACTIVE; |
3f52b7e3 MP |
122 | } else if (light_sleep_cnt || deep_sleep_cnt) { |
123 | mps_dbg(sdata, "setting non-peer PM to deep sleep\n"); | |
39886b61 | 124 | nonpeer_pm = NL80211_MESH_POWER_DEEP_SLEEP; |
3f52b7e3 MP |
125 | } else { |
126 | mps_dbg(sdata, "setting non-peer PM to user value\n"); | |
39886b61 | 127 | nonpeer_pm = ifmsh->mshcfg.power_mode; |
3f52b7e3 MP |
128 | } |
129 | ||
39886b61 TP |
130 | /* 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; | |
3f52b7e3 MP |
137 | ifmsh->ps_peers_light_sleep = light_sleep_cnt; |
138 | ifmsh->ps_peers_deep_sleep = deep_sleep_cnt; | |
39886b61 TP |
139 | |
140 | return changed; | |
3f52b7e3 MP |
141 | } |
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 | |
39886b61 | 148 | * Return BSS_CHANGED_BEACON if a beacon update is in order. |
3f52b7e3 | 149 | */ |
39886b61 TP |
150 | u32 ieee80211_mps_set_sta_local_pm(struct sta_info *sta, |
151 | enum nl80211_mesh_power_mode pm) | |
3f52b7e3 MP |
152 | { |
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 | ||
39886b61 | 167 | return ieee80211_mps_local_status_update(sdata); |
3f52b7e3 MP |
168 | } |
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 | */ | |
182 | void 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 | */ | |
227 | void 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 | ||
266 | static 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 | ||
302 | static 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 | */ | |
329 | void 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 | ||
355 | static 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 | */ | |
403 | static 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 | */ | |
441 | static 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 | */ | |
529 | void 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 | */ | |
567 | void 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 | } |