1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * HT handling
4 *
5 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
6 * Copyright 2002-2005, Instant802 Networks, Inc.
7 * Copyright 2005-2006, Devicescape Software, Inc.
8 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
9 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
10 * Copyright 2007-2010, Intel Corporation
11 * Copyright 2017 Intel Deutschland GmbH
12 * Copyright(c) 2020-2024 Intel Corporation
13 */
14
15 #include <linux/ieee80211.h>
16 #include <linux/export.h>
17 #include <net/mac80211.h>
18 #include "ieee80211_i.h"
19 #include "rate.h"
20
21 static void __check_htcap_disable(struct ieee80211_ht_cap *ht_capa,
22 struct ieee80211_ht_cap *ht_capa_mask,
23 struct ieee80211_sta_ht_cap *ht_cap,
24 u16 flag)
25 {
26 __le16 le_flag = cpu_to_le16(flag);
27 if (ht_capa_mask->cap_info & le_flag) {
28 if (!(ht_capa->cap_info & le_flag))
29 ht_cap->cap &= ~flag;
30 }
31 }
32
33 static void __check_htcap_enable(struct ieee80211_ht_cap *ht_capa,
34 struct ieee80211_ht_cap *ht_capa_mask,
35 struct ieee80211_sta_ht_cap *ht_cap,
36 u16 flag)
37 {
38 __le16 le_flag = cpu_to_le16(flag);
39
40 if ((ht_capa_mask->cap_info & le_flag) &&
41 (ht_capa->cap_info & le_flag))
42 ht_cap->cap |= flag;
43 }
44
45 void ieee80211_apply_htcap_overrides(struct ieee80211_sub_if_data *sdata,
46 struct ieee80211_sta_ht_cap *ht_cap)
47 {
48 struct ieee80211_ht_cap *ht_capa, *ht_capa_mask;
49 u8 *scaps, *smask;
50 int i;
51
52 if (!ht_cap->ht_supported)
53 return;
54
55 switch (sdata->vif.type) {
56 case NL80211_IFTYPE_STATION:
57 ht_capa = &sdata->u.mgd.ht_capa;
58 ht_capa_mask = &sdata->u.mgd.ht_capa_mask;
59 break;
60 case NL80211_IFTYPE_ADHOC:
61 ht_capa = &sdata->u.ibss.ht_capa;
62 ht_capa_mask = &sdata->u.ibss.ht_capa_mask;
63 break;
64 default:
65 WARN_ON_ONCE(1);
66 return;
67 }
68
69 scaps = (u8 *)(&ht_capa->mcs.rx_mask);
70 smask = (u8 *)(&ht_capa_mask->mcs.rx_mask);
71
72 /* NOTE: If you add more over-rides here, update register_hw
73 * ht_capa_mod_mask logic in main.c as well.
74 * And, if this method can ever change ht_cap.ht_supported, fix
75 * the check in ieee80211_add_ht_ie.
76 */
77
78 /* check for HT over-rides, MCS rates first. */
79 for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++) {
80 u8 m = smask[i];
81 ht_cap->mcs.rx_mask[i] &= ~m; /* turn off all masked bits */
82 /* Add back rates that are supported */
83 ht_cap->mcs.rx_mask[i] |= (m & scaps[i]);
84 }
85
86 /* Force removal of HT-40 capabilities? */
87 __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
88 IEEE80211_HT_CAP_SUP_WIDTH_20_40);
89 __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
90 IEEE80211_HT_CAP_SGI_40);
91
92 /* Allow user to disable SGI-20 (SGI-40 is handled above) */
93 __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
94 IEEE80211_HT_CAP_SGI_20);
95
96 /* Allow user to disable the max-AMSDU bit. */
97 __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
98 IEEE80211_HT_CAP_MAX_AMSDU);
99
100 /* Allow user to disable LDPC */
101 __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
102 IEEE80211_HT_CAP_LDPC_CODING);
103
104 /* Allow user to enable 40 MHz intolerant bit. */
105 __check_htcap_enable(ht_capa, ht_capa_mask, ht_cap,
106 IEEE80211_HT_CAP_40MHZ_INTOLERANT);
107
108 /* Allow user to enable TX STBC bit */
109 __check_htcap_enable(ht_capa, ht_capa_mask, ht_cap,
110 IEEE80211_HT_CAP_TX_STBC);
111
112 /* Allow user to configure RX STBC bits */
113 if (ht_capa_mask->cap_info & cpu_to_le16(IEEE80211_HT_CAP_RX_STBC))
114 ht_cap->cap |= le16_to_cpu(ht_capa->cap_info) &
115 IEEE80211_HT_CAP_RX_STBC;
116
117 /* Allow user to decrease AMPDU factor */
118 if (ht_capa_mask->ampdu_params_info &
119 IEEE80211_HT_AMPDU_PARM_FACTOR) {
120 u8 n = ht_capa->ampdu_params_info &
121 IEEE80211_HT_AMPDU_PARM_FACTOR;
122 if (n < ht_cap->ampdu_factor)
123 ht_cap->ampdu_factor = n;
124 }
125
126 /* Allow the user to increase AMPDU density. */
127 if (ht_capa_mask->ampdu_params_info &
128 IEEE80211_HT_AMPDU_PARM_DENSITY) {
129 u8 n = (ht_capa->ampdu_params_info &
130 IEEE80211_HT_AMPDU_PARM_DENSITY)
131 >> IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT;
132 if (n > ht_cap->ampdu_density)
133 ht_cap->ampdu_density = n;
134 }
135 }
136
137
138 bool ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data *sdata,
139 struct ieee80211_supported_band *sband,
140 const struct ieee80211_ht_cap *ht_cap_ie,
141 struct link_sta_info *link_sta)
142 {
143 struct ieee80211_bss_conf *link_conf;
144 struct sta_info *sta = link_sta->sta;
145 struct ieee80211_sta_ht_cap ht_cap, own_cap;
146 u8 ampdu_info, tx_mcs_set_cap;
147 int i, max_tx_streams;
148 bool changed;
149 enum ieee80211_sta_rx_bandwidth bw;
150 enum nl80211_chan_width width;
151
152 memset(&ht_cap, 0, sizeof(ht_cap));
153
154 if (!ht_cap_ie || !sband->ht_cap.ht_supported)
155 goto apply;
156
157 ht_cap.ht_supported = true;
158
159 own_cap = sband->ht_cap;
160
161 /*
162 * If user has specified capability over-rides, take care
163 * of that if the station we're setting up is the AP or TDLS peer that
164 * we advertised a restricted capability set to. Override
165 * our own capabilities and then use those below.
166 */
167 if (sdata->vif.type == NL80211_IFTYPE_STATION ||
168 sdata->vif.type == NL80211_IFTYPE_ADHOC)
169 ieee80211_apply_htcap_overrides(sdata, &own_cap);
170
171 /*
172 * The bits listed in this expression should be
173 * the same for the peer and us, if the station
174 * advertises more then we can't use those thus
175 * we mask them out.
176 */
177 ht_cap.cap = le16_to_cpu(ht_cap_ie->cap_info) &
178 (own_cap.cap | ~(IEEE80211_HT_CAP_LDPC_CODING |
179 IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
180 IEEE80211_HT_CAP_GRN_FLD |
181 IEEE80211_HT_CAP_SGI_20 |
182 IEEE80211_HT_CAP_SGI_40 |
183 IEEE80211_HT_CAP_DSSSCCK40));
184
185 /*
186 * The STBC bits are asymmetric -- if we don't have
187 * TX then mask out the peer's RX and vice versa.
188 */
189 if (!(own_cap.cap & IEEE80211_HT_CAP_TX_STBC))
190 ht_cap.cap &= ~IEEE80211_HT_CAP_RX_STBC;
191 if (!(own_cap.cap & IEEE80211_HT_CAP_RX_STBC))
192 ht_cap.cap &= ~IEEE80211_HT_CAP_TX_STBC;
193
194 ampdu_info = ht_cap_ie->ampdu_params_info;
195 ht_cap.ampdu_factor =
196 ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR;
197 ht_cap.ampdu_density =
198 (ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2;
199
200 /* own MCS TX capabilities */
201 tx_mcs_set_cap = own_cap.mcs.tx_params;
202
203 /* Copy peer MCS TX capabilities, the driver might need them. */
204 ht_cap.mcs.tx_params = ht_cap_ie->mcs.tx_params;
205
206 /* can we TX with MCS rates? */
207 if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED))
208 goto apply;
209
210 /* Counting from 0, therefore +1 */
211 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF)
212 max_tx_streams =
213 ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
214 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
215 else
216 max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS;
217
218 /*
219 * 802.11n-2009 20.3.5 / 20.6 says:
220 * - indices 0 to 7 and 32 are single spatial stream
221 * - 8 to 31 are multiple spatial streams using equal modulation
222 * [8..15 for two streams, 16..23 for three and 24..31 for four]
223 * - remainder are multiple spatial streams using unequal modulation
224 */
225 for (i = 0; i < max_tx_streams; i++)
226 ht_cap.mcs.rx_mask[i] =
227 own_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i];
228
229 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION)
230 for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE;
231 i < IEEE80211_HT_MCS_MASK_LEN; i++)
232 ht_cap.mcs.rx_mask[i] =
233 own_cap.mcs.rx_mask[i] &
234 ht_cap_ie->mcs.rx_mask[i];
235
236 /* handle MCS rate 32 too */
237 if (own_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1)
238 ht_cap.mcs.rx_mask[32/8] |= 1;
239
240 /* set Rx highest rate */
241 ht_cap.mcs.rx_highest = ht_cap_ie->mcs.rx_highest;
242
243 if (ht_cap.cap & IEEE80211_HT_CAP_MAX_AMSDU)
244 link_sta->pub->agg.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_7935;
245 else
246 link_sta->pub->agg.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_3839;
247
248 ieee80211_sta_recalc_aggregates(&sta->sta);
249
250 apply:
251 changed = memcmp(&link_sta->pub->ht_cap, &ht_cap, sizeof(ht_cap));
252
253 memcpy(&link_sta->pub->ht_cap, &ht_cap, sizeof(ht_cap));
254
255 rcu_read_lock();
256 link_conf = rcu_dereference(sdata->vif.link_conf[link_sta->link_id]);
257 if (WARN_ON(!link_conf))
258 width = NL80211_CHAN_WIDTH_20_NOHT;
259 else
260 width = link_conf->chanreq.oper.width;
261
262 switch (width) {
263 default:
264 WARN_ON_ONCE(1);
265 fallthrough;
266 case NL80211_CHAN_WIDTH_20_NOHT:
267 case NL80211_CHAN_WIDTH_20:
268 bw = IEEE80211_STA_RX_BW_20;
269 break;
270 case NL80211_CHAN_WIDTH_40:
271 case NL80211_CHAN_WIDTH_80:
272 case NL80211_CHAN_WIDTH_80P80:
273 case NL80211_CHAN_WIDTH_160:
274 case NL80211_CHAN_WIDTH_320:
275 bw = ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
276 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
277 break;
278 }
279 rcu_read_unlock();
280
281 link_sta->pub->bandwidth = bw;
282
283 link_sta->cur_max_bandwidth =
284 ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
285 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
286
287 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
288 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
289 enum ieee80211_smps_mode smps_mode;
290
291 switch ((ht_cap.cap & IEEE80211_HT_CAP_SM_PS)
292 >> IEEE80211_HT_CAP_SM_PS_SHIFT) {
293 case WLAN_HT_CAP_SM_PS_INVALID:
294 case WLAN_HT_CAP_SM_PS_STATIC:
295 smps_mode = IEEE80211_SMPS_STATIC;
296 break;
297 case WLAN_HT_CAP_SM_PS_DYNAMIC:
298 smps_mode = IEEE80211_SMPS_DYNAMIC;
299 break;
300 case WLAN_HT_CAP_SM_PS_DISABLED:
301 smps_mode = IEEE80211_SMPS_OFF;
302 break;
303 }
304
305 if (smps_mode != link_sta->pub->smps_mode)
306 changed = true;
307 link_sta->pub->smps_mode = smps_mode;
308 } else {
309 link_sta->pub->smps_mode = IEEE80211_SMPS_OFF;
310 }
311
312 return changed;
313 }
314
315 void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta,
316 enum ieee80211_agg_stop_reason reason)
317 {
318 int i;
319
320 lockdep_assert_wiphy(sta->local->hw.wiphy);
321
322 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
323 __ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
324 WLAN_REASON_QSTA_LEAVE_QBSS,
325 reason != AGG_STOP_DESTROY_STA &&
326 reason != AGG_STOP_PEER_REQUEST);
327
328 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
329 __ieee80211_stop_tx_ba_session(sta, i, reason);
330
331 /*
332 * In case the tear down is part of a reconfigure due to HW restart
333 * request, it is possible that the low level driver requested to stop
334 * the BA session, so handle it to properly clean tid_tx data.
335 */
336 if(reason == AGG_STOP_DESTROY_STA) {
337 wiphy_work_cancel(sta->local->hw.wiphy, &sta->ampdu_mlme.work);
338
339 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
340 struct tid_ampdu_tx *tid_tx =
341 rcu_dereference_protected_tid_tx(sta, i);
342
343 if (!tid_tx)
344 continue;
345
346 if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state))
347 ieee80211_stop_tx_ba_cb(sta, i, tid_tx);
348 }
349 }
350 }
351
352 void ieee80211_ba_session_work(struct wiphy *wiphy, struct wiphy_work *work)
353 {
354 struct sta_info *sta =
355 container_of(work, struct sta_info, ampdu_mlme.work);
356 struct tid_ampdu_tx *tid_tx;
357 bool blocked;
358 int tid;
359
360 lockdep_assert_wiphy(sta->local->hw.wiphy);
361
362 /* When this flag is set, new sessions should be blocked. */
363 blocked = test_sta_flag(sta, WLAN_STA_BLOCK_BA);
364
365 for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
366 if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired))
367 __ieee80211_stop_rx_ba_session(
368 sta, tid, WLAN_BACK_RECIPIENT,
369 WLAN_REASON_QSTA_TIMEOUT, true);
370
371 if (test_and_clear_bit(tid,
372 sta->ampdu_mlme.tid_rx_stop_requested))
373 __ieee80211_stop_rx_ba_session(
374 sta, tid, WLAN_BACK_RECIPIENT,
375 WLAN_REASON_UNSPECIFIED, true);
376
377 if (!blocked &&
378 test_and_clear_bit(tid,
379 sta->ampdu_mlme.tid_rx_manage_offl))
380 __ieee80211_start_rx_ba_session(sta, 0, 0, 0, 1, tid,
381 IEEE80211_MAX_AMPDU_BUF_HT,
382 false, true, NULL);
383
384 if (test_and_clear_bit(tid + IEEE80211_NUM_TIDS,
385 sta->ampdu_mlme.tid_rx_manage_offl))
386 __ieee80211_stop_rx_ba_session(
387 sta, tid, WLAN_BACK_RECIPIENT,
388 0, false);
389
390 spin_lock_bh(&sta->lock);
391
392 tid_tx = sta->ampdu_mlme.tid_start_tx[tid];
393 if (!blocked && tid_tx) {
394 struct txq_info *txqi = to_txq_info(sta->sta.txq[tid]);
395 struct ieee80211_sub_if_data *sdata =
396 vif_to_sdata(txqi->txq.vif);
397 struct fq *fq = &sdata->local->fq;
398
399 spin_lock_bh(&fq->lock);
400
401 /* Allow only frags to be dequeued */
402 set_bit(IEEE80211_TXQ_STOP, &txqi->flags);
403
404 if (!skb_queue_empty(&txqi->frags)) {
405 /* Fragmented Tx is ongoing, wait for it to
406 * finish. Reschedule worker to retry later.
407 */
408
409 spin_unlock_bh(&fq->lock);
410 spin_unlock_bh(&sta->lock);
411
412 /* Give the task working on the txq a chance
413 * to send out the queued frags
414 */
415 synchronize_net();
416
417 wiphy_work_queue(sdata->local->hw.wiphy, work);
418 return;
419 }
420
421 spin_unlock_bh(&fq->lock);
422
423 /*
424 * Assign it over to the normal tid_tx array
425 * where it "goes live".
426 */
427
428 sta->ampdu_mlme.tid_start_tx[tid] = NULL;
429 /* could there be a race? */
430 if (sta->ampdu_mlme.tid_tx[tid])
431 kfree(tid_tx);
432 else
433 ieee80211_assign_tid_tx(sta, tid, tid_tx);
434 spin_unlock_bh(&sta->lock);
435
436 ieee80211_tx_ba_session_handle_start(sta, tid);
437 continue;
438 }
439 spin_unlock_bh(&sta->lock);
440
441 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
442 if (!tid_tx)
443 continue;
444
445 if (!blocked &&
446 test_and_clear_bit(HT_AGG_STATE_START_CB, &tid_tx->state))
447 ieee80211_start_tx_ba_cb(sta, tid, tid_tx);
448 if (test_and_clear_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state))
449 __ieee80211_stop_tx_ba_session(sta, tid,
450 AGG_STOP_LOCAL_REQUEST);
451 if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state))
452 ieee80211_stop_tx_ba_cb(sta, tid, tid_tx);
453 }
454 }
455
456 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
457 const u8 *da, u16 tid,
458 u16 initiator, u16 reason_code)
459 {
460 struct ieee80211_local *local = sdata->local;
461 struct sk_buff *skb;
462 struct ieee80211_mgmt *mgmt;
463 u16 params;
464
465 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
466 if (!skb)
467 return;
468
469 skb_reserve(skb, local->hw.extra_tx_headroom);
470 mgmt = skb_put_zero(skb, 24);
471 memcpy(mgmt->da, da, ETH_ALEN);
472 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
473 if (sdata->vif.type == NL80211_IFTYPE_AP ||
474 sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
475 sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
476 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
477 else if (sdata->vif.type == NL80211_IFTYPE_STATION)
478 memcpy(mgmt->bssid, sdata->vif.cfg.ap_addr, ETH_ALEN);
479 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
480 memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN);
481
482 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
483 IEEE80211_STYPE_ACTION);
484
485 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
486
487 mgmt->u.action.category = WLAN_CATEGORY_BACK;
488 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
489 params = (u16)(initiator << 11); /* bit 11 initiator */
490 params |= (u16)(tid << 12); /* bit 15:12 TID number */
491
492 mgmt->u.action.u.delba.params = cpu_to_le16(params);
493 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
494
495 ieee80211_tx_skb(sdata, skb);
496 }
497
498 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
499 struct sta_info *sta,
500 struct ieee80211_mgmt *mgmt, size_t len)
501 {
502 u16 tid, params;
503 u16 initiator;
504
505 params = le16_to_cpu(mgmt->u.action.u.delba.params);
506 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
507 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
508
509 ht_dbg_ratelimited(sdata, "delba from %pM (%s) tid %d reason code %d\n",
510 mgmt->sa, initiator ? "initiator" : "recipient",
511 tid,
512 le16_to_cpu(mgmt->u.action.u.delba.reason_code));
513
514 if (initiator == WLAN_BACK_INITIATOR)
515 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0,
516 true);
517 else
518 __ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_PEER_REQUEST);
519 }
520
521 enum nl80211_smps_mode
522 ieee80211_smps_mode_to_smps_mode(enum ieee80211_smps_mode smps)
523 {
524 switch (smps) {
525 case IEEE80211_SMPS_OFF:
526 return NL80211_SMPS_OFF;
527 case IEEE80211_SMPS_STATIC:
528 return NL80211_SMPS_STATIC;
529 case IEEE80211_SMPS_DYNAMIC:
530 return NL80211_SMPS_DYNAMIC;
531 default:
532 return NL80211_SMPS_OFF;
533 }
534 }
535
536 int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,
537 enum ieee80211_smps_mode smps, const u8 *da,
538 const u8 *bssid, int link_id)
539 {
540 struct ieee80211_local *local = sdata->local;
541 struct sk_buff *skb;
542 struct ieee80211_mgmt *action_frame;
543 struct ieee80211_tx_info *info;
544 u8 status_link_id = link_id < 0 ? 0 : link_id;
545
546 /* 27 = header + category + action + smps mode */
547 skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom);
548 if (!skb)
549 return -ENOMEM;
550
551 skb_reserve(skb, local->hw.extra_tx_headroom);
552 action_frame = skb_put(skb, 27);
553 memcpy(action_frame->da, da, ETH_ALEN);
554 memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN);
555 memcpy(action_frame->bssid, bssid, ETH_ALEN);
556 action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
557 IEEE80211_STYPE_ACTION);
558 action_frame->u.action.category = WLAN_CATEGORY_HT;
559 action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS;
560 switch (smps) {
561 case IEEE80211_SMPS_AUTOMATIC:
562 case IEEE80211_SMPS_NUM_MODES:
563 WARN_ON(1);
564 smps = IEEE80211_SMPS_OFF;
565 fallthrough;
566 case IEEE80211_SMPS_OFF:
567 action_frame->u.action.u.ht_smps.smps_control =
568 WLAN_HT_SMPS_CONTROL_DISABLED;
569 break;
570 case IEEE80211_SMPS_STATIC:
571 action_frame->u.action.u.ht_smps.smps_control =
572 WLAN_HT_SMPS_CONTROL_STATIC;
573 break;
574 case IEEE80211_SMPS_DYNAMIC:
575 action_frame->u.action.u.ht_smps.smps_control =
576 WLAN_HT_SMPS_CONTROL_DYNAMIC;
577 break;
578 }
579
580 /* we'll do more on status of this frame */
581 info = IEEE80211_SKB_CB(skb);
582 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
583 /* we have 13 bits, and need 6: link_id 4, smps 2 */
584 info->status_data = IEEE80211_STATUS_TYPE_SMPS |
585 u16_encode_bits(status_link_id << 2 | smps,
586 IEEE80211_STATUS_SUBDATA_MASK);
587 ieee80211_tx_skb_tid(sdata, skb, 7, link_id);
588
589 return 0;
590 }
591
592 void ieee80211_request_smps(struct ieee80211_vif *vif, unsigned int link_id,
593 enum ieee80211_smps_mode smps_mode)
594 {
595 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
596 struct ieee80211_link_data *link;
597
598 if (WARN_ON_ONCE(vif->type != NL80211_IFTYPE_STATION))
599 return;
600
601 rcu_read_lock();
602 link = rcu_dereference(sdata->link[link_id]);
603 if (WARN_ON(!link))
604 goto out;
605
606 trace_api_request_smps(sdata->local, sdata, link, smps_mode);
607
608 if (link->u.mgd.driver_smps_mode == smps_mode)
609 goto out;
610
611 link->u.mgd.driver_smps_mode = smps_mode;
612 wiphy_work_queue(sdata->local->hw.wiphy,
613 &link->u.mgd.request_smps_work);
614 out:
615 rcu_read_unlock();
616 }
617 /* this might change ... don't want non-open drivers using it */
618 EXPORT_SYMBOL_GPL(ieee80211_request_smps);
619
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