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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) 2020-2021 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 struct ieee80211_supported_band *sband,
140 const struct ieee80211_ht_cap *ht_cap_ie,
141 struct sta_info *sta)
142{
143 struct ieee80211_sta_ht_cap ht_cap, own_cap;
144 u8 ampdu_info, tx_mcs_set_cap;
145 int i, max_tx_streams;
146 bool changed;
147 enum ieee80211_sta_rx_bandwidth bw;
148
149 memset(&ht_cap, 0, sizeof(ht_cap));
150
151 if (!ht_cap_ie || !sband->ht_cap.ht_supported)
152 goto apply;
153
154 ht_cap.ht_supported = true;
155
156 own_cap = sband->ht_cap;
157
158 /*
159 * If user has specified capability over-rides, take care
160 * of that if the station we're setting up is the AP or TDLS peer that
161 * we advertised a restricted capability set to. Override
162 * our own capabilities and then use those below.
163 */
164 if (sdata->vif.type == NL80211_IFTYPE_STATION ||
165 sdata->vif.type == NL80211_IFTYPE_ADHOC)
166 ieee80211_apply_htcap_overrides(sdata, &own_cap);
167
168 /*
169 * The bits listed in this expression should be
170 * the same for the peer and us, if the station
171 * advertises more then we can't use those thus
172 * we mask them out.
173 */
174 ht_cap.cap = le16_to_cpu(ht_cap_ie->cap_info) &
175 (own_cap.cap | ~(IEEE80211_HT_CAP_LDPC_CODING |
176 IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
177 IEEE80211_HT_CAP_GRN_FLD |
178 IEEE80211_HT_CAP_SGI_20 |
179 IEEE80211_HT_CAP_SGI_40 |
180 IEEE80211_HT_CAP_DSSSCCK40));
181
182 /*
183 * The STBC bits are asymmetric -- if we don't have
184 * TX then mask out the peer's RX and vice versa.
185 */
186 if (!(own_cap.cap & IEEE80211_HT_CAP_TX_STBC))
187 ht_cap.cap &= ~IEEE80211_HT_CAP_RX_STBC;
188 if (!(own_cap.cap & IEEE80211_HT_CAP_RX_STBC))
189 ht_cap.cap &= ~IEEE80211_HT_CAP_TX_STBC;
190
191 ampdu_info = ht_cap_ie->ampdu_params_info;
192 ht_cap.ampdu_factor =
193 ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR;
194 ht_cap.ampdu_density =
195 (ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2;
196
197 /* own MCS TX capabilities */
198 tx_mcs_set_cap = own_cap.mcs.tx_params;
199
200 /* Copy peer MCS TX capabilities, the driver might need them. */
201 ht_cap.mcs.tx_params = ht_cap_ie->mcs.tx_params;
202
203 /* can we TX with MCS rates? */
204 if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED))
205 goto apply;
206
207 /* Counting from 0, therefore +1 */
208 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF)
209 max_tx_streams =
210 ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
211 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
212 else
213 max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS;
214
215 /*
216 * 802.11n-2009 20.3.5 / 20.6 says:
217 * - indices 0 to 7 and 32 are single spatial stream
218 * - 8 to 31 are multiple spatial streams using equal modulation
219 * [8..15 for two streams, 16..23 for three and 24..31 for four]
220 * - remainder are multiple spatial streams using unequal modulation
221 */
222 for (i = 0; i < max_tx_streams; i++)
223 ht_cap.mcs.rx_mask[i] =
224 own_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i];
225
226 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION)
227 for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE;
228 i < IEEE80211_HT_MCS_MASK_LEN; i++)
229 ht_cap.mcs.rx_mask[i] =
230 own_cap.mcs.rx_mask[i] &
231 ht_cap_ie->mcs.rx_mask[i];
232
233 /* handle MCS rate 32 too */
234 if (own_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1)
235 ht_cap.mcs.rx_mask[32/8] |= 1;
236
237 /* set Rx highest rate */
238 ht_cap.mcs.rx_highest = ht_cap_ie->mcs.rx_highest;
239
240 if (ht_cap.cap & IEEE80211_HT_CAP_MAX_AMSDU)
241 sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_7935;
242 else
243 sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_3839;
244
245 apply:
246 changed = memcmp(&sta->sta.ht_cap, &ht_cap, sizeof(ht_cap));
247
248 memcpy(&sta->sta.ht_cap, &ht_cap, sizeof(ht_cap));
249
250 switch (sdata->vif.bss_conf.chandef.width) {
251 default:
252 WARN_ON_ONCE(1);
253 fallthrough;
254 case NL80211_CHAN_WIDTH_20_NOHT:
255 case NL80211_CHAN_WIDTH_20:
256 bw = IEEE80211_STA_RX_BW_20;
257 break;
258 case NL80211_CHAN_WIDTH_40:
259 case NL80211_CHAN_WIDTH_80:
260 case NL80211_CHAN_WIDTH_80P80:
261 case NL80211_CHAN_WIDTH_160:
262 bw = ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
263 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
264 break;
265 }
266
267 sta->sta.bandwidth = bw;
268
269 sta->cur_max_bandwidth =
270 ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
271 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
272
273 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
274 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
275 enum ieee80211_smps_mode smps_mode;
276
277 switch ((ht_cap.cap & IEEE80211_HT_CAP_SM_PS)
278 >> IEEE80211_HT_CAP_SM_PS_SHIFT) {
279 case WLAN_HT_CAP_SM_PS_INVALID:
280 case WLAN_HT_CAP_SM_PS_STATIC:
281 smps_mode = IEEE80211_SMPS_STATIC;
282 break;
283 case WLAN_HT_CAP_SM_PS_DYNAMIC:
284 smps_mode = IEEE80211_SMPS_DYNAMIC;
285 break;
286 case WLAN_HT_CAP_SM_PS_DISABLED:
287 smps_mode = IEEE80211_SMPS_OFF;
288 break;
289 }
290
291 if (smps_mode != sta->sta.smps_mode)
292 changed = true;
293 sta->sta.smps_mode = smps_mode;
294 } else {
295 sta->sta.smps_mode = IEEE80211_SMPS_OFF;
296 }
297 return changed;
298}
299
300void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta,
301 enum ieee80211_agg_stop_reason reason)
302{
303 int i;
304
305 mutex_lock(&sta->ampdu_mlme.mtx);
306 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
307 ___ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
308 WLAN_REASON_QSTA_LEAVE_QBSS,
309 reason != AGG_STOP_DESTROY_STA &&
310 reason != AGG_STOP_PEER_REQUEST);
311
312 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
313 ___ieee80211_stop_tx_ba_session(sta, i, reason);
314 mutex_unlock(&sta->ampdu_mlme.mtx);
315
316 /*
317 * In case the tear down is part of a reconfigure due to HW restart
318 * request, it is possible that the low level driver requested to stop
319 * the BA session, so handle it to properly clean tid_tx data.
320 */
321 if(reason == AGG_STOP_DESTROY_STA) {
322 cancel_work_sync(&sta->ampdu_mlme.work);
323
324 mutex_lock(&sta->ampdu_mlme.mtx);
325 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
326 struct tid_ampdu_tx *tid_tx =
327 rcu_dereference_protected_tid_tx(sta, i);
328
329 if (!tid_tx)
330 continue;
331
332 if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state))
333 ieee80211_stop_tx_ba_cb(sta, i, tid_tx);
334 }
335 mutex_unlock(&sta->ampdu_mlme.mtx);
336 }
337}
338
339void ieee80211_ba_session_work(struct work_struct *work)
340{
341 struct sta_info *sta =
342 container_of(work, struct sta_info, ampdu_mlme.work);
343 struct tid_ampdu_tx *tid_tx;
344 bool blocked;
345 int tid;
346
347 /* When this flag is set, new sessions should be blocked. */
348 blocked = test_sta_flag(sta, WLAN_STA_BLOCK_BA);
349
350 mutex_lock(&sta->ampdu_mlme.mtx);
351 for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
352 if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired))
353 ___ieee80211_stop_rx_ba_session(
354 sta, tid, WLAN_BACK_RECIPIENT,
355 WLAN_REASON_QSTA_TIMEOUT, true);
356
357 if (test_and_clear_bit(tid,
358 sta->ampdu_mlme.tid_rx_stop_requested))
359 ___ieee80211_stop_rx_ba_session(
360 sta, tid, WLAN_BACK_RECIPIENT,
361 WLAN_REASON_UNSPECIFIED, true);
362
363 if (!blocked &&
364 test_and_clear_bit(tid,
365 sta->ampdu_mlme.tid_rx_manage_offl))
366 ___ieee80211_start_rx_ba_session(sta, 0, 0, 0, 1, tid,
367 IEEE80211_MAX_AMPDU_BUF_HT,
368 false, true, NULL);
369
370 if (test_and_clear_bit(tid + IEEE80211_NUM_TIDS,
371 sta->ampdu_mlme.tid_rx_manage_offl))
372 ___ieee80211_stop_rx_ba_session(
373 sta, tid, WLAN_BACK_RECIPIENT,
374 0, false);
375
376 spin_lock_bh(&sta->lock);
377
378 tid_tx = sta->ampdu_mlme.tid_start_tx[tid];
379 if (!blocked && tid_tx) {
380 /*
381 * Assign it over to the normal tid_tx array
382 * where it "goes live".
383 */
384
385 sta->ampdu_mlme.tid_start_tx[tid] = NULL;
386 /* could there be a race? */
387 if (sta->ampdu_mlme.tid_tx[tid])
388 kfree(tid_tx);
389 else
390 ieee80211_assign_tid_tx(sta, tid, tid_tx);
391 spin_unlock_bh(&sta->lock);
392
393 ieee80211_tx_ba_session_handle_start(sta, tid);
394 continue;
395 }
396 spin_unlock_bh(&sta->lock);
397
398 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
399 if (!tid_tx)
400 continue;
401
402 if (!blocked &&
403 test_and_clear_bit(HT_AGG_STATE_START_CB, &tid_tx->state))
404 ieee80211_start_tx_ba_cb(sta, tid, tid_tx);
405 if (test_and_clear_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state))
406 ___ieee80211_stop_tx_ba_session(sta, tid,
407 AGG_STOP_LOCAL_REQUEST);
408 if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state))
409 ieee80211_stop_tx_ba_cb(sta, tid, tid_tx);
410 }
411 mutex_unlock(&sta->ampdu_mlme.mtx);
412}
413
414void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
415 const u8 *da, u16 tid,
416 u16 initiator, u16 reason_code)
417{
418 struct ieee80211_local *local = sdata->local;
419 struct sk_buff *skb;
420 struct ieee80211_mgmt *mgmt;
421 u16 params;
422
423 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
424 if (!skb)
425 return;
426
427 skb_reserve(skb, local->hw.extra_tx_headroom);
428 mgmt = skb_put_zero(skb, 24);
429 memcpy(mgmt->da, da, ETH_ALEN);
430 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
431 if (sdata->vif.type == NL80211_IFTYPE_AP ||
432 sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
433 sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
434 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
435 else if (sdata->vif.type == NL80211_IFTYPE_STATION)
436 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
437 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
438 memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN);
439
440 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
441 IEEE80211_STYPE_ACTION);
442
443 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
444
445 mgmt->u.action.category = WLAN_CATEGORY_BACK;
446 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
447 params = (u16)(initiator << 11); /* bit 11 initiator */
448 params |= (u16)(tid << 12); /* bit 15:12 TID number */
449
450 mgmt->u.action.u.delba.params = cpu_to_le16(params);
451 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
452
453 ieee80211_tx_skb(sdata, skb);
454}
455
456void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
457 struct sta_info *sta,
458 struct ieee80211_mgmt *mgmt, size_t len)
459{
460 u16 tid, params;
461 u16 initiator;
462
463 params = le16_to_cpu(mgmt->u.action.u.delba.params);
464 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
465 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
466
467 ht_dbg_ratelimited(sdata, "delba from %pM (%s) tid %d reason code %d\n",
468 mgmt->sa, initiator ? "initiator" : "recipient",
469 tid,
470 le16_to_cpu(mgmt->u.action.u.delba.reason_code));
471
472 if (initiator == WLAN_BACK_INITIATOR)
473 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0,
474 true);
475 else
476 __ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_PEER_REQUEST);
477}
478
479enum nl80211_smps_mode
480ieee80211_smps_mode_to_smps_mode(enum ieee80211_smps_mode smps)
481{
482 switch (smps) {
483 case IEEE80211_SMPS_OFF:
484 return NL80211_SMPS_OFF;
485 case IEEE80211_SMPS_STATIC:
486 return NL80211_SMPS_STATIC;
487 case IEEE80211_SMPS_DYNAMIC:
488 return NL80211_SMPS_DYNAMIC;
489 default:
490 return NL80211_SMPS_OFF;
491 }
492}
493
494int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,
495 enum ieee80211_smps_mode smps, const u8 *da,
496 const u8 *bssid)
497{
498 struct ieee80211_local *local = sdata->local;
499 struct sk_buff *skb;
500 struct ieee80211_mgmt *action_frame;
501
502 /* 27 = header + category + action + smps mode */
503 skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom);
504 if (!skb)
505 return -ENOMEM;
506
507 skb_reserve(skb, local->hw.extra_tx_headroom);
508 action_frame = skb_put(skb, 27);
509 memcpy(action_frame->da, da, ETH_ALEN);
510 memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN);
511 memcpy(action_frame->bssid, bssid, ETH_ALEN);
512 action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
513 IEEE80211_STYPE_ACTION);
514 action_frame->u.action.category = WLAN_CATEGORY_HT;
515 action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS;
516 switch (smps) {
517 case IEEE80211_SMPS_AUTOMATIC:
518 case IEEE80211_SMPS_NUM_MODES:
519 WARN_ON(1);
520 fallthrough;
521 case IEEE80211_SMPS_OFF:
522 action_frame->u.action.u.ht_smps.smps_control =
523 WLAN_HT_SMPS_CONTROL_DISABLED;
524 break;
525 case IEEE80211_SMPS_STATIC:
526 action_frame->u.action.u.ht_smps.smps_control =
527 WLAN_HT_SMPS_CONTROL_STATIC;
528 break;
529 case IEEE80211_SMPS_DYNAMIC:
530 action_frame->u.action.u.ht_smps.smps_control =
531 WLAN_HT_SMPS_CONTROL_DYNAMIC;
532 break;
533 }
534
535 /* we'll do more on status of this frame */
536 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
537 ieee80211_tx_skb(sdata, skb);
538
539 return 0;
540}
541
542void ieee80211_request_smps_mgd_work(struct work_struct *work)
543{
544 struct ieee80211_sub_if_data *sdata =
545 container_of(work, struct ieee80211_sub_if_data,
546 u.mgd.request_smps_work);
547
548 sdata_lock(sdata);
549 __ieee80211_request_smps_mgd(sdata, sdata->u.mgd.driver_smps_mode);
550 sdata_unlock(sdata);
551}
552
553void ieee80211_request_smps(struct ieee80211_vif *vif,
554 enum ieee80211_smps_mode smps_mode)
555{
556 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
557
558 if (WARN_ON_ONCE(vif->type != NL80211_IFTYPE_STATION))
559 return;
560
561 if (sdata->u.mgd.driver_smps_mode == smps_mode)
562 return;
563
564 sdata->u.mgd.driver_smps_mode = smps_mode;
565 ieee80211_queue_work(&sdata->local->hw,
566 &sdata->u.mgd.request_smps_work);
567}
568/* this might change ... don't want non-open drivers using it */
569EXPORT_SYMBOL_GPL(ieee80211_request_smps);
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
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 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
315void 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
352void 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, 0);
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
456void 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 = ieee80211_mgmt_ba(skb, da, sdata);
471
472 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
473
474 mgmt->u.action.category = WLAN_CATEGORY_BACK;
475 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
476 params = (u16)(initiator << 11); /* bit 11 initiator */
477 params |= (u16)(tid << 12); /* bit 15:12 TID number */
478
479 mgmt->u.action.u.delba.params = cpu_to_le16(params);
480 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
481
482 ieee80211_tx_skb(sdata, skb);
483}
484
485void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
486 struct sta_info *sta,
487 struct ieee80211_mgmt *mgmt, size_t len)
488{
489 u16 tid, params;
490 u16 initiator;
491
492 params = le16_to_cpu(mgmt->u.action.u.delba.params);
493 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
494 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
495
496 ht_dbg_ratelimited(sdata, "delba from %pM (%s) tid %d reason code %d\n",
497 mgmt->sa, initiator ? "initiator" : "recipient",
498 tid,
499 le16_to_cpu(mgmt->u.action.u.delba.reason_code));
500
501 if (initiator == WLAN_BACK_INITIATOR)
502 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0,
503 true);
504 else
505 __ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_PEER_REQUEST);
506}
507
508enum nl80211_smps_mode
509ieee80211_smps_mode_to_smps_mode(enum ieee80211_smps_mode smps)
510{
511 switch (smps) {
512 case IEEE80211_SMPS_OFF:
513 return NL80211_SMPS_OFF;
514 case IEEE80211_SMPS_STATIC:
515 return NL80211_SMPS_STATIC;
516 case IEEE80211_SMPS_DYNAMIC:
517 return NL80211_SMPS_DYNAMIC;
518 default:
519 return NL80211_SMPS_OFF;
520 }
521}
522
523int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,
524 enum ieee80211_smps_mode smps, const u8 *da,
525 const u8 *bssid, int link_id)
526{
527 struct ieee80211_local *local = sdata->local;
528 struct sk_buff *skb;
529 struct ieee80211_mgmt *action_frame;
530 struct ieee80211_tx_info *info;
531 u8 status_link_id = link_id < 0 ? 0 : link_id;
532
533 /* 27 = header + category + action + smps mode */
534 skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom);
535 if (!skb)
536 return -ENOMEM;
537
538 skb_reserve(skb, local->hw.extra_tx_headroom);
539 action_frame = skb_put(skb, 27);
540 memcpy(action_frame->da, da, ETH_ALEN);
541 memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN);
542 memcpy(action_frame->bssid, bssid, ETH_ALEN);
543 action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
544 IEEE80211_STYPE_ACTION);
545 action_frame->u.action.category = WLAN_CATEGORY_HT;
546 action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS;
547 switch (smps) {
548 case IEEE80211_SMPS_AUTOMATIC:
549 case IEEE80211_SMPS_NUM_MODES:
550 WARN_ON(1);
551 smps = IEEE80211_SMPS_OFF;
552 fallthrough;
553 case IEEE80211_SMPS_OFF:
554 action_frame->u.action.u.ht_smps.smps_control =
555 WLAN_HT_SMPS_CONTROL_DISABLED;
556 break;
557 case IEEE80211_SMPS_STATIC:
558 action_frame->u.action.u.ht_smps.smps_control =
559 WLAN_HT_SMPS_CONTROL_STATIC;
560 break;
561 case IEEE80211_SMPS_DYNAMIC:
562 action_frame->u.action.u.ht_smps.smps_control =
563 WLAN_HT_SMPS_CONTROL_DYNAMIC;
564 break;
565 }
566
567 /* we'll do more on status of this frame */
568 info = IEEE80211_SKB_CB(skb);
569 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
570 /* we have 13 bits, and need 6: link_id 4, smps 2 */
571 info->status_data = IEEE80211_STATUS_TYPE_SMPS |
572 u16_encode_bits(status_link_id << 2 | smps,
573 IEEE80211_STATUS_SUBDATA_MASK);
574 ieee80211_tx_skb_tid(sdata, skb, 7, link_id);
575
576 return 0;
577}
578
579void ieee80211_request_smps(struct ieee80211_vif *vif, unsigned int link_id,
580 enum ieee80211_smps_mode smps_mode)
581{
582 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
583 struct ieee80211_link_data *link;
584
585 if (WARN_ON_ONCE(vif->type != NL80211_IFTYPE_STATION))
586 return;
587
588 rcu_read_lock();
589 link = rcu_dereference(sdata->link[link_id]);
590 if (WARN_ON(!link))
591 goto out;
592
593 trace_api_request_smps(sdata->local, sdata, link, smps_mode);
594
595 if (link->u.mgd.driver_smps_mode == smps_mode)
596 goto out;
597
598 link->u.mgd.driver_smps_mode = smps_mode;
599 wiphy_work_queue(sdata->local->hw.wiphy,
600 &link->u.mgd.request_smps_work);
601out:
602 rcu_read_unlock();
603}
604/* this might change ... don't want non-open drivers using it */
605EXPORT_SYMBOL_GPL(ieee80211_request_smps);