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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * HT handling
4 *
5 * Copyright 2003, Jouni Malinen <[email protected]>
6 * Copyright 2002-2005, Instant802 Networks, Inc.
7 * Copyright 2005-2006, Devicescape Software, Inc.
8 * Copyright 2006-2007 Jiri Benc <[email protected]>
9 * Copyright 2007, Michael Wu <[email protected]>
10 * Copyright 2007-2010, Intel Corporation
11 * Copyright 2017 Intel Deutschland GmbH
12 * Copyright(c) 2020-2026 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
21static 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
33static 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
45void 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
138bool ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data *sdata,
139 const struct ieee80211_sta_ht_cap *own_cap_ptr,
140 const struct ieee80211_ht_cap *ht_cap_ie,
141 struct link_sta_info *link_sta)
142{
143 struct sta_info *sta = link_sta->sta;
144 struct ieee80211_sta_ht_cap ht_cap, own_cap;
145 u8 ampdu_info, tx_mcs_set_cap;
146 int i, max_tx_streams;
147 bool changed;
148
149 memset(&ht_cap, 0, sizeof(ht_cap));
150
151 if (!ht_cap_ie || !own_cap_ptr->ht_supported)
152 goto apply;
153
154 /* NDI station are using the capabilities from the NMI station */
155 if (WARN_ON_ONCE(sdata->vif.type == NL80211_IFTYPE_NAN_DATA))
156 return 0;
157
158 ht_cap.ht_supported = true;
159
160 own_cap = *own_cap_ptr;
161
162 /*
163 * If user has specified capability over-rides, take care
164 * of that if the station we're setting up is the AP or TDLS peer that
165 * we advertised a restricted capability set to. Override
166 * our own capabilities and then use those below.
167 */
168 if (sdata->vif.type == NL80211_IFTYPE_STATION ||
169 sdata->vif.type == NL80211_IFTYPE_ADHOC)
170 ieee80211_apply_htcap_overrides(sdata, &own_cap);
171
172 /*
173 * The bits listed in this expression should be
174 * the same for the peer and us, if the station
175 * advertises more then we can't use those thus
176 * we mask them out.
177 */
178 ht_cap.cap = le16_to_cpu(ht_cap_ie->cap_info) &
179 (own_cap.cap | ~(IEEE80211_HT_CAP_LDPC_CODING |
180 IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
181 IEEE80211_HT_CAP_GRN_FLD |
182 IEEE80211_HT_CAP_SGI_20 |
183 IEEE80211_HT_CAP_SGI_40 |
184 IEEE80211_HT_CAP_DSSSCCK40));
185
186 /*
187 * The STBC bits are asymmetric -- if we don't have
188 * TX then mask out the peer's RX and vice versa.
189 */
190 if (!(own_cap.cap & IEEE80211_HT_CAP_TX_STBC))
191 ht_cap.cap &= ~IEEE80211_HT_CAP_RX_STBC;
192 if (!(own_cap.cap & IEEE80211_HT_CAP_RX_STBC))
193 ht_cap.cap &= ~IEEE80211_HT_CAP_TX_STBC;
194
195 ampdu_info = ht_cap_ie->ampdu_params_info;
196 ht_cap.ampdu_factor =
197 ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR;
198 ht_cap.ampdu_density =
199 (ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2;
200
201 /* own MCS TX capabilities */
202 tx_mcs_set_cap = own_cap.mcs.tx_params;
203
204 /* Copy peer MCS TX capabilities, the driver might need them. */
205 ht_cap.mcs.tx_params = ht_cap_ie->mcs.tx_params;
206
207 /* can we TX with MCS rates? */
208 if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED))
209 goto apply;
210
211 /* Counting from 0, therefore +1 */
212 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF)
213 max_tx_streams =
214 ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
215 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
216 else
217 max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS;
218
219 /*
220 * 802.11n-2009 20.3.5 / 20.6 says:
221 * - indices 0 to 7 and 32 are single spatial stream
222 * - 8 to 31 are multiple spatial streams using equal modulation
223 * [8..15 for two streams, 16..23 for three and 24..31 for four]
224 * - remainder are multiple spatial streams using unequal modulation
225 */
226 for (i = 0; i < max_tx_streams; i++)
227 ht_cap.mcs.rx_mask[i] =
228 own_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i];
229
230 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION)
231 for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE;
232 i < IEEE80211_HT_MCS_MASK_LEN; i++)
233 ht_cap.mcs.rx_mask[i] =
234 own_cap.mcs.rx_mask[i] &
235 ht_cap_ie->mcs.rx_mask[i];
236
237 /* handle MCS rate 32 too */
238 if (own_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1)
239 ht_cap.mcs.rx_mask[32/8] |= 1;
240
241 /* set Rx highest rate */
242 ht_cap.mcs.rx_highest = ht_cap_ie->mcs.rx_highest;
243
244 if (ht_cap.cap & IEEE80211_HT_CAP_MAX_AMSDU)
245 link_sta->pub->agg.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_7935;
246 else
247 link_sta->pub->agg.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_3839;
248
249 ieee80211_sta_recalc_aggregates(&sta->sta);
250
251 apply:
252 changed = memcmp(&link_sta->pub->ht_cap, &ht_cap, sizeof(ht_cap));
253
254 memcpy(&link_sta->pub->ht_cap, &ht_cap, sizeof(ht_cap));
255
256 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
257 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
258 sta->sdata->vif.type == NL80211_IFTYPE_NAN ||
259 sta->sdata->vif.type == NL80211_IFTYPE_NAN_DATA) {
260 enum ieee80211_smps_mode smps_mode;
261
262 switch ((ht_cap.cap & IEEE80211_HT_CAP_SM_PS)
263 >> IEEE80211_HT_CAP_SM_PS_SHIFT) {
264 case WLAN_HT_CAP_SM_PS_INVALID:
265 case WLAN_HT_CAP_SM_PS_STATIC:
266 smps_mode = IEEE80211_SMPS_STATIC;
267 break;
268 case WLAN_HT_CAP_SM_PS_DYNAMIC:
269 smps_mode = IEEE80211_SMPS_DYNAMIC;
270 break;
271 case WLAN_HT_CAP_SM_PS_DISABLED:
272 smps_mode = IEEE80211_SMPS_OFF;
273 break;
274 }
275
276 if (smps_mode != link_sta->pub->smps_mode)
277 changed = true;
278 link_sta->pub->smps_mode = smps_mode;
279 } else {
280 link_sta->pub->smps_mode = IEEE80211_SMPS_OFF;
281 }
282
283 return changed;
284}
285
286void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta,
287 enum ieee80211_agg_stop_reason reason)
288{
289 int i;
290
291 lockdep_assert_wiphy(sta->local->hw.wiphy);
292
293 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
294 __ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
295 WLAN_REASON_QSTA_LEAVE_QBSS,
296 reason != AGG_STOP_DESTROY_STA &&
297 reason != AGG_STOP_PEER_REQUEST);
298
299 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
300 __ieee80211_stop_tx_ba_session(sta, i, reason);
301
302 /*
303 * In case the tear down is part of a reconfigure due to HW restart
304 * request, it is possible that the low level driver requested to stop
305 * the BA session, so handle it to properly clean tid_tx data.
306 */
307 if(reason == AGG_STOP_DESTROY_STA) {
308 wiphy_work_cancel(sta->local->hw.wiphy, &sta->ampdu_mlme.work);
309
310 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
311 struct tid_ampdu_tx *tid_tx =
312 rcu_dereference_protected_tid_tx(sta, i);
313
314 if (!tid_tx)
315 continue;
316
317 if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state))
318 ieee80211_stop_tx_ba_cb(sta, i, tid_tx);
319 }
320 }
321}
322
323void ieee80211_ba_session_work(struct wiphy *wiphy, struct wiphy_work *work)
324{
325 struct sta_info *sta =
326 container_of(work, struct sta_info, ampdu_mlme.work);
327 struct tid_ampdu_tx *tid_tx;
328 bool blocked;
329 int tid;
330
331 lockdep_assert_wiphy(sta->local->hw.wiphy);
332
333 /* When this flag is set, new sessions should be blocked. */
334 blocked = test_sta_flag(sta, WLAN_STA_BLOCK_BA);
335
336 for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
337 if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired))
338 __ieee80211_stop_rx_ba_session(
339 sta, tid, WLAN_BACK_RECIPIENT,
340 WLAN_REASON_QSTA_TIMEOUT, true);
341
342 if (test_and_clear_bit(tid,
343 sta->ampdu_mlme.tid_rx_stop_requested))
344 __ieee80211_stop_rx_ba_session(
345 sta, tid, WLAN_BACK_RECIPIENT,
346 WLAN_REASON_UNSPECIFIED, true);
347
348 if (!blocked &&
349 test_and_clear_bit(tid,
350 sta->ampdu_mlme.tid_rx_manage_offl))
351 __ieee80211_start_rx_ba_session(sta, 0, 0, 0, 1, tid,
352 IEEE80211_MAX_AMPDU_BUF_HT,
353 false, true, false, 0);
354
355 if (test_and_clear_bit(tid + IEEE80211_NUM_TIDS,
356 sta->ampdu_mlme.tid_rx_manage_offl))
357 __ieee80211_stop_rx_ba_session(
358 sta, tid, WLAN_BACK_RECIPIENT,
359 0, false);
360
361 spin_lock_bh(&sta->lock);
362
363 tid_tx = sta->ampdu_mlme.tid_start_tx[tid];
364 if (!blocked && tid_tx) {
365 struct txq_info *txqi = to_txq_info(sta->sta.txq[tid]);
366 struct ieee80211_sub_if_data *sdata =
367 vif_to_sdata(txqi->txq.vif);
368 struct fq *fq = &sdata->local->fq;
369
370 spin_lock_bh(&fq->lock);
371
372 /* Allow only frags to be dequeued */
373 set_bit(IEEE80211_TXQ_STOP, &txqi->flags);
374
375 if (!skb_queue_empty(&txqi->frags)) {
376 /* Fragmented Tx is ongoing, wait for it to
377 * finish. Reschedule worker to retry later.
378 */
379
380 spin_unlock_bh(&fq->lock);
381 spin_unlock_bh(&sta->lock);
382
383 /* Give the task working on the txq a chance
384 * to send out the queued frags
385 */
386 synchronize_net();
387
388 wiphy_work_queue(sdata->local->hw.wiphy, work);
389 return;
390 }
391
392 spin_unlock_bh(&fq->lock);
393
394 /*
395 * Assign it over to the normal tid_tx array
396 * where it "goes live".
397 */
398
399 sta->ampdu_mlme.tid_start_tx[tid] = NULL;
400 /* could there be a race? */
401 if (sta->ampdu_mlme.tid_tx[tid])
402 kfree(tid_tx);
403 else
404 ieee80211_assign_tid_tx(sta, tid, tid_tx);
405 spin_unlock_bh(&sta->lock);
406
407 ieee80211_tx_ba_session_handle_start(sta, tid);
408 continue;
409 }
410 spin_unlock_bh(&sta->lock);
411
412 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
413 if (!tid_tx)
414 continue;
415
416 if (!blocked &&
417 test_and_clear_bit(HT_AGG_STATE_START_CB, &tid_tx->state))
418 ieee80211_start_tx_ba_cb(sta, tid, tid_tx);
419 if (test_and_clear_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state))
420 __ieee80211_stop_tx_ba_session(sta, tid,
421 AGG_STOP_LOCAL_REQUEST);
422 if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state))
423 ieee80211_stop_tx_ba_cb(sta, tid, tid_tx);
424 }
425}
426
427void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
428 const u8 *da, u16 tid,
429 u16 initiator, u16 reason_code,
430 bool use_ndp)
431{
432 struct ieee80211_local *local = sdata->local;
433 struct sk_buff *skb;
434 struct ieee80211_mgmt *mgmt;
435 u16 params;
436
437 skb = dev_alloc_skb(IEEE80211_MIN_ACTION_SIZE(delba) +
438 local->hw.extra_tx_headroom);
439 if (!skb)
440 return;
441
442 skb_reserve(skb, local->hw.extra_tx_headroom);
443 mgmt = ieee80211_mgmt_ba(skb, da, sdata);
444
445 skb_put(skb, 2 + sizeof(mgmt->u.action.delba));
446
447 mgmt->u.action.category = WLAN_CATEGORY_BACK;
448 mgmt->u.action.action_code = use_ndp ?
449 WLAN_ACTION_NDP_DELBA : WLAN_ACTION_DELBA;
450 params = (u16)(initiator << 11); /* bit 11 initiator */
451 params |= (u16)(tid << 12); /* bit 15:12 TID number */
452
453 mgmt->u.action.delba.params = cpu_to_le16(params);
454 mgmt->u.action.delba.reason_code = cpu_to_le16(reason_code);
455
456 ieee80211_tx_skb(sdata, skb);
457}
458
459void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
460 struct sta_info *sta,
461 struct ieee80211_mgmt *mgmt, size_t len)
462{
463 u16 tid, params;
464 u16 initiator;
465
466 params = le16_to_cpu(mgmt->u.action.delba.params);
467 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
468 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
469
470 ht_dbg_ratelimited(sdata, "delba from %pM (%s) tid %d reason code %d\n",
471 mgmt->sa, initiator ? "initiator" : "recipient",
472 tid,
473 le16_to_cpu(mgmt->u.action.delba.reason_code));
474
475 if (initiator == WLAN_BACK_INITIATOR)
476 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0,
477 true);
478 else
479 __ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_PEER_REQUEST);
480}
481
482enum nl80211_smps_mode
483ieee80211_smps_mode_to_smps_mode(enum ieee80211_smps_mode smps)
484{
485 switch (smps) {
486 case IEEE80211_SMPS_OFF:
487 return NL80211_SMPS_OFF;
488 case IEEE80211_SMPS_STATIC:
489 return NL80211_SMPS_STATIC;
490 case IEEE80211_SMPS_DYNAMIC:
491 return NL80211_SMPS_DYNAMIC;
492 default:
493 return NL80211_SMPS_OFF;
494 }
495}
496
497int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,
498 enum ieee80211_smps_mode smps, const u8 *da,
499 const u8 *bssid, int link_id)
500{
501 struct ieee80211_local *local = sdata->local;
502 struct sk_buff *skb;
503 struct ieee80211_mgmt *action_frame;
504 struct ieee80211_tx_info *info;
505 u8 status_link_id = link_id < 0 ? 0 : link_id;
506
507 skb = dev_alloc_skb(IEEE80211_MIN_ACTION_SIZE(ht_smps) +
508 local->hw.extra_tx_headroom);
509 if (!skb)
510 return -ENOMEM;
511
512 skb_reserve(skb, local->hw.extra_tx_headroom);
513 action_frame = skb_put_zero(skb, IEEE80211_MIN_ACTION_SIZE(ht_smps));
514 memcpy(action_frame->da, da, ETH_ALEN);
515 memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN);
516 memcpy(action_frame->bssid, bssid, ETH_ALEN);
517 action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
518 IEEE80211_STYPE_ACTION);
519 action_frame->u.action.category = WLAN_CATEGORY_HT;
520 action_frame->u.action.action_code = WLAN_HT_ACTION_SMPS;
521 switch (smps) {
522 case IEEE80211_SMPS_AUTOMATIC:
523 case IEEE80211_SMPS_NUM_MODES:
524 WARN_ON(1);
525 smps = IEEE80211_SMPS_OFF;
526 fallthrough;
527 case IEEE80211_SMPS_OFF:
528 action_frame->u.action.ht_smps.smps_control =
529 WLAN_HT_SMPS_CONTROL_DISABLED;
530 break;
531 case IEEE80211_SMPS_STATIC:
532 action_frame->u.action.ht_smps.smps_control =
533 WLAN_HT_SMPS_CONTROL_STATIC;
534 break;
535 case IEEE80211_SMPS_DYNAMIC:
536 action_frame->u.action.ht_smps.smps_control =
537 WLAN_HT_SMPS_CONTROL_DYNAMIC;
538 break;
539 }
540
541 /* we'll do more on status of this frame */
542 info = IEEE80211_SKB_CB(skb);
543 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
544 /* we have 13 bits, and need 6: link_id 4, smps 2 */
545 info->status_data = IEEE80211_STATUS_TYPE_SMPS |
546 u16_encode_bits(status_link_id << 2 | smps,
547 IEEE80211_STATUS_SUBDATA_MASK);
548 ieee80211_tx_skb_tid(sdata, skb, 7, link_id);
549
550 return 0;
551}
552
553void ieee80211_request_smps(struct ieee80211_vif *vif, unsigned int link_id,
554 enum ieee80211_smps_mode smps_mode)
555{
556 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
557 struct ieee80211_link_data *link;
558
559 if (WARN_ON_ONCE(vif->type != NL80211_IFTYPE_STATION))
560 return;
561
562 rcu_read_lock();
563 link = rcu_dereference(sdata->link[link_id]);
564 if (WARN_ON(!link))
565 goto out;
566
567 trace_api_request_smps(sdata->local, sdata, link, smps_mode);
568
569 if (link->u.mgd.driver_smps_mode == smps_mode)
570 goto out;
571
572 link->u.mgd.driver_smps_mode = smps_mode;
573 wiphy_work_queue(sdata->local->hw.wiphy,
574 &link->u.mgd.request_smps_work);
575out:
576 rcu_read_unlock();
577}
578/* this might change ... don't want non-open drivers using it */
579EXPORT_SYMBOL_GPL(ieee80211_request_smps);
580
581void ieee80211_ht_handle_chanwidth_notif(struct ieee80211_local *local,
582 struct ieee80211_sub_if_data *sdata,
583 struct sta_info *sta,
584 struct link_sta_info *link_sta,
585 u8 chanwidth, enum nl80211_band band)
586{
587 enum ieee80211_sta_rx_bandwidth max_bw;
588 struct sta_opmode_info sta_opmode = {
589 .changed = STA_OPMODE_MAX_BW_CHANGED,
590 };
591 struct ieee80211_link_data *link;
592
593 lockdep_assert_wiphy(local->hw.wiphy);
594
595 link = sdata_dereference(sdata->link[link_sta->link_id], sdata);
596 if (WARN_ON(!link))
597 return;
598
599 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
600 max_bw = IEEE80211_STA_RX_BW_20;
601 else
602 max_bw = IEEE80211_STA_RX_BW_MAX;
603
604 /* set op_mode_bw and recalc sta bw */
605 link_sta->op_mode_bw = max_bw;
606
607 if (!ieee80211_link_sta_update_rc_bw(link, link_sta))
608 return;
609
610 sta_opmode.bw = ieee80211_sta_rx_bw_to_chan_width(link_sta->pub->bandwidth);
611
612 cfg80211_sta_opmode_change_notify(sdata->dev, sta->addr,
613 &sta_opmode, GFP_KERNEL);
614}