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1/*
2 * HT handling
3 *
4 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
5 * Copyright 2002-2005, Instant802 Networks, Inc.
6 * Copyright 2005-2006, Devicescape Software, Inc.
7 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
8 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
9 * Copyright 2007-2010, Intel Corporation
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15
16#include <linux/ieee80211.h>
17#include <linux/export.h>
18#include <net/mac80211.h>
19#include "ieee80211_i.h"
20#include "rate.h"
21
22static void __check_htcap_disable(struct ieee80211_ht_cap *ht_capa,
23 struct ieee80211_ht_cap *ht_capa_mask,
24 struct ieee80211_sta_ht_cap *ht_cap,
25 u16 flag)
26{
27 __le16 le_flag = cpu_to_le16(flag);
28 if (ht_capa_mask->cap_info & le_flag) {
29 if (!(ht_capa->cap_info & le_flag))
30 ht_cap->cap &= ~flag;
31 }
32}
33
34static void __check_htcap_enable(struct ieee80211_ht_cap *ht_capa,
35 struct ieee80211_ht_cap *ht_capa_mask,
36 struct ieee80211_sta_ht_cap *ht_cap,
37 u16 flag)
38{
39 __le16 le_flag = cpu_to_le16(flag);
40
41 if ((ht_capa_mask->cap_info & le_flag) &&
42 (ht_capa->cap_info & le_flag))
43 ht_cap->cap |= flag;
44}
45
46void ieee80211_apply_htcap_overrides(struct ieee80211_sub_if_data *sdata,
47 struct ieee80211_sta_ht_cap *ht_cap)
48{
49 struct ieee80211_ht_cap *ht_capa, *ht_capa_mask;
50 u8 *scaps, *smask;
51 int i;
52
53 if (!ht_cap->ht_supported)
54 return;
55
56 switch (sdata->vif.type) {
57 case NL80211_IFTYPE_STATION:
58 ht_capa = &sdata->u.mgd.ht_capa;
59 ht_capa_mask = &sdata->u.mgd.ht_capa_mask;
60 break;
61 case NL80211_IFTYPE_ADHOC:
62 ht_capa = &sdata->u.ibss.ht_capa;
63 ht_capa_mask = &sdata->u.ibss.ht_capa_mask;
64 break;
65 default:
66 WARN_ON_ONCE(1);
67 return;
68 }
69
70 scaps = (u8 *)(&ht_capa->mcs.rx_mask);
71 smask = (u8 *)(&ht_capa_mask->mcs.rx_mask);
72
73 /* NOTE: If you add more over-rides here, update register_hw
74 * ht_capa_mod_mask logic in main.c as well.
75 * And, if this method can ever change ht_cap.ht_supported, fix
76 * the check in ieee80211_add_ht_ie.
77 */
78
79 /* check for HT over-rides, MCS rates first. */
80 for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++) {
81 u8 m = smask[i];
82 ht_cap->mcs.rx_mask[i] &= ~m; /* turn off all masked bits */
83 /* Add back rates that are supported */
84 ht_cap->mcs.rx_mask[i] |= (m & scaps[i]);
85 }
86
87 /* Force removal of HT-40 capabilities? */
88 __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
89 IEEE80211_HT_CAP_SUP_WIDTH_20_40);
90 __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
91 IEEE80211_HT_CAP_SGI_40);
92
93 /* Allow user to disable SGI-20 (SGI-40 is handled above) */
94 __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
95 IEEE80211_HT_CAP_SGI_20);
96
97 /* Allow user to disable the max-AMSDU bit. */
98 __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
99 IEEE80211_HT_CAP_MAX_AMSDU);
100
101 /* Allow user to disable LDPC */
102 __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
103 IEEE80211_HT_CAP_LDPC_CODING);
104
105 /* Allow user to enable 40 MHz intolerant bit. */
106 __check_htcap_enable(ht_capa, ht_capa_mask, ht_cap,
107 IEEE80211_HT_CAP_40MHZ_INTOLERANT);
108
109 /* Allow user to decrease AMPDU factor */
110 if (ht_capa_mask->ampdu_params_info &
111 IEEE80211_HT_AMPDU_PARM_FACTOR) {
112 u8 n = ht_capa->ampdu_params_info &
113 IEEE80211_HT_AMPDU_PARM_FACTOR;
114 if (n < ht_cap->ampdu_factor)
115 ht_cap->ampdu_factor = n;
116 }
117
118 /* Allow the user to increase AMPDU density. */
119 if (ht_capa_mask->ampdu_params_info &
120 IEEE80211_HT_AMPDU_PARM_DENSITY) {
121 u8 n = (ht_capa->ampdu_params_info &
122 IEEE80211_HT_AMPDU_PARM_DENSITY)
123 >> IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT;
124 if (n > ht_cap->ampdu_density)
125 ht_cap->ampdu_density = n;
126 }
127}
128
129
130bool ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data *sdata,
131 struct ieee80211_supported_band *sband,
132 const struct ieee80211_ht_cap *ht_cap_ie,
133 struct sta_info *sta)
134{
135 struct ieee80211_sta_ht_cap ht_cap, own_cap;
136 u8 ampdu_info, tx_mcs_set_cap;
137 int i, max_tx_streams;
138 bool changed;
139 enum ieee80211_sta_rx_bandwidth bw;
140 enum ieee80211_smps_mode smps_mode;
141
142 memset(&ht_cap, 0, sizeof(ht_cap));
143
144 if (!ht_cap_ie || !sband->ht_cap.ht_supported)
145 goto apply;
146
147 ht_cap.ht_supported = true;
148
149 own_cap = sband->ht_cap;
150
151 /*
152 * If user has specified capability over-rides, take care
153 * of that if the station we're setting up is the AP or TDLS peer that
154 * we advertised a restricted capability set to. Override
155 * our own capabilities and then use those below.
156 */
157 if (sdata->vif.type == NL80211_IFTYPE_STATION ||
158 sdata->vif.type == NL80211_IFTYPE_ADHOC)
159 ieee80211_apply_htcap_overrides(sdata, &own_cap);
160
161 /*
162 * The bits listed in this expression should be
163 * the same for the peer and us, if the station
164 * advertises more then we can't use those thus
165 * we mask them out.
166 */
167 ht_cap.cap = le16_to_cpu(ht_cap_ie->cap_info) &
168 (own_cap.cap | ~(IEEE80211_HT_CAP_LDPC_CODING |
169 IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
170 IEEE80211_HT_CAP_GRN_FLD |
171 IEEE80211_HT_CAP_SGI_20 |
172 IEEE80211_HT_CAP_SGI_40 |
173 IEEE80211_HT_CAP_DSSSCCK40));
174
175 /*
176 * The STBC bits are asymmetric -- if we don't have
177 * TX then mask out the peer's RX and vice versa.
178 */
179 if (!(own_cap.cap & IEEE80211_HT_CAP_TX_STBC))
180 ht_cap.cap &= ~IEEE80211_HT_CAP_RX_STBC;
181 if (!(own_cap.cap & IEEE80211_HT_CAP_RX_STBC))
182 ht_cap.cap &= ~IEEE80211_HT_CAP_TX_STBC;
183
184 ampdu_info = ht_cap_ie->ampdu_params_info;
185 ht_cap.ampdu_factor =
186 ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR;
187 ht_cap.ampdu_density =
188 (ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2;
189
190 /* own MCS TX capabilities */
191 tx_mcs_set_cap = own_cap.mcs.tx_params;
192
193 /* Copy peer MCS TX capabilities, the driver might need them. */
194 ht_cap.mcs.tx_params = ht_cap_ie->mcs.tx_params;
195
196 /* can we TX with MCS rates? */
197 if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED))
198 goto apply;
199
200 /* Counting from 0, therefore +1 */
201 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF)
202 max_tx_streams =
203 ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
204 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
205 else
206 max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS;
207
208 /*
209 * 802.11n-2009 20.3.5 / 20.6 says:
210 * - indices 0 to 7 and 32 are single spatial stream
211 * - 8 to 31 are multiple spatial streams using equal modulation
212 * [8..15 for two streams, 16..23 for three and 24..31 for four]
213 * - remainder are multiple spatial streams using unequal modulation
214 */
215 for (i = 0; i < max_tx_streams; i++)
216 ht_cap.mcs.rx_mask[i] =
217 own_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i];
218
219 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION)
220 for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE;
221 i < IEEE80211_HT_MCS_MASK_LEN; i++)
222 ht_cap.mcs.rx_mask[i] =
223 own_cap.mcs.rx_mask[i] &
224 ht_cap_ie->mcs.rx_mask[i];
225
226 /* handle MCS rate 32 too */
227 if (own_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1)
228 ht_cap.mcs.rx_mask[32/8] |= 1;
229
230 /* set Rx highest rate */
231 ht_cap.mcs.rx_highest = ht_cap_ie->mcs.rx_highest;
232
233 if (ht_cap.cap & IEEE80211_HT_CAP_MAX_AMSDU)
234 sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_7935;
235 else
236 sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_3839;
237
238 apply:
239 changed = memcmp(&sta->sta.ht_cap, &ht_cap, sizeof(ht_cap));
240
241 memcpy(&sta->sta.ht_cap, &ht_cap, sizeof(ht_cap));
242
243 switch (sdata->vif.bss_conf.chandef.width) {
244 default:
245 WARN_ON_ONCE(1);
246 /* fall through */
247 case NL80211_CHAN_WIDTH_20_NOHT:
248 case NL80211_CHAN_WIDTH_20:
249 bw = IEEE80211_STA_RX_BW_20;
250 break;
251 case NL80211_CHAN_WIDTH_40:
252 case NL80211_CHAN_WIDTH_80:
253 case NL80211_CHAN_WIDTH_80P80:
254 case NL80211_CHAN_WIDTH_160:
255 bw = ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
256 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
257 break;
258 }
259
260 sta->sta.bandwidth = bw;
261
262 sta->cur_max_bandwidth =
263 ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
264 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
265
266 switch ((ht_cap.cap & IEEE80211_HT_CAP_SM_PS)
267 >> IEEE80211_HT_CAP_SM_PS_SHIFT) {
268 case WLAN_HT_CAP_SM_PS_INVALID:
269 case WLAN_HT_CAP_SM_PS_STATIC:
270 smps_mode = IEEE80211_SMPS_STATIC;
271 break;
272 case WLAN_HT_CAP_SM_PS_DYNAMIC:
273 smps_mode = IEEE80211_SMPS_DYNAMIC;
274 break;
275 case WLAN_HT_CAP_SM_PS_DISABLED:
276 smps_mode = IEEE80211_SMPS_OFF;
277 break;
278 }
279
280 if (smps_mode != sta->sta.smps_mode)
281 changed = true;
282 sta->sta.smps_mode = smps_mode;
283
284 return changed;
285}
286
287void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta,
288 enum ieee80211_agg_stop_reason reason)
289{
290 int i;
291
292 cancel_work_sync(&sta->ampdu_mlme.work);
293
294 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
295 __ieee80211_stop_tx_ba_session(sta, i, reason);
296 __ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
297 WLAN_REASON_QSTA_LEAVE_QBSS,
298 reason != AGG_STOP_DESTROY_STA &&
299 reason != AGG_STOP_PEER_REQUEST);
300 }
301}
302
303void ieee80211_ba_session_work(struct work_struct *work)
304{
305 struct sta_info *sta =
306 container_of(work, struct sta_info, ampdu_mlme.work);
307 struct tid_ampdu_tx *tid_tx;
308 int tid;
309
310 /*
311 * When this flag is set, new sessions should be
312 * blocked, and existing sessions will be torn
313 * down by the code that set the flag, so this
314 * need not run.
315 */
316 if (test_sta_flag(sta, WLAN_STA_BLOCK_BA))
317 return;
318
319 mutex_lock(&sta->ampdu_mlme.mtx);
320 for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
321 if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired))
322 ___ieee80211_stop_rx_ba_session(
323 sta, tid, WLAN_BACK_RECIPIENT,
324 WLAN_REASON_QSTA_TIMEOUT, true);
325
326 if (test_and_clear_bit(tid,
327 sta->ampdu_mlme.tid_rx_stop_requested))
328 ___ieee80211_stop_rx_ba_session(
329 sta, tid, WLAN_BACK_RECIPIENT,
330 WLAN_REASON_UNSPECIFIED, true);
331
332 spin_lock_bh(&sta->lock);
333
334 tid_tx = sta->ampdu_mlme.tid_start_tx[tid];
335 if (tid_tx) {
336 /*
337 * Assign it over to the normal tid_tx array
338 * where it "goes live".
339 */
340
341 sta->ampdu_mlme.tid_start_tx[tid] = NULL;
342 /* could there be a race? */
343 if (sta->ampdu_mlme.tid_tx[tid])
344 kfree(tid_tx);
345 else
346 ieee80211_assign_tid_tx(sta, tid, tid_tx);
347 spin_unlock_bh(&sta->lock);
348
349 ieee80211_tx_ba_session_handle_start(sta, tid);
350 continue;
351 }
352 spin_unlock_bh(&sta->lock);
353
354 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
355 if (tid_tx && test_and_clear_bit(HT_AGG_STATE_WANT_STOP,
356 &tid_tx->state))
357 ___ieee80211_stop_tx_ba_session(sta, tid,
358 AGG_STOP_LOCAL_REQUEST);
359 }
360 mutex_unlock(&sta->ampdu_mlme.mtx);
361}
362
363void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
364 const u8 *da, u16 tid,
365 u16 initiator, u16 reason_code)
366{
367 struct ieee80211_local *local = sdata->local;
368 struct sk_buff *skb;
369 struct ieee80211_mgmt *mgmt;
370 u16 params;
371
372 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
373 if (!skb)
374 return;
375
376 skb_reserve(skb, local->hw.extra_tx_headroom);
377 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
378 memset(mgmt, 0, 24);
379 memcpy(mgmt->da, da, ETH_ALEN);
380 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
381 if (sdata->vif.type == NL80211_IFTYPE_AP ||
382 sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
383 sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
384 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
385 else if (sdata->vif.type == NL80211_IFTYPE_STATION)
386 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
387 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
388 memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN);
389
390 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
391 IEEE80211_STYPE_ACTION);
392
393 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
394
395 mgmt->u.action.category = WLAN_CATEGORY_BACK;
396 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
397 params = (u16)(initiator << 11); /* bit 11 initiator */
398 params |= (u16)(tid << 12); /* bit 15:12 TID number */
399
400 mgmt->u.action.u.delba.params = cpu_to_le16(params);
401 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
402
403 ieee80211_tx_skb(sdata, skb);
404}
405
406void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
407 struct sta_info *sta,
408 struct ieee80211_mgmt *mgmt, size_t len)
409{
410 u16 tid, params;
411 u16 initiator;
412
413 params = le16_to_cpu(mgmt->u.action.u.delba.params);
414 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
415 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
416
417 ht_dbg_ratelimited(sdata, "delba from %pM (%s) tid %d reason code %d\n",
418 mgmt->sa, initiator ? "initiator" : "recipient",
419 tid,
420 le16_to_cpu(mgmt->u.action.u.delba.reason_code));
421
422 if (initiator == WLAN_BACK_INITIATOR)
423 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0,
424 true);
425 else
426 __ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_PEER_REQUEST);
427}
428
429int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,
430 enum ieee80211_smps_mode smps, const u8 *da,
431 const u8 *bssid)
432{
433 struct ieee80211_local *local = sdata->local;
434 struct sk_buff *skb;
435 struct ieee80211_mgmt *action_frame;
436
437 /* 27 = header + category + action + smps mode */
438 skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom);
439 if (!skb)
440 return -ENOMEM;
441
442 skb_reserve(skb, local->hw.extra_tx_headroom);
443 action_frame = (void *)skb_put(skb, 27);
444 memcpy(action_frame->da, da, ETH_ALEN);
445 memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN);
446 memcpy(action_frame->bssid, bssid, ETH_ALEN);
447 action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
448 IEEE80211_STYPE_ACTION);
449 action_frame->u.action.category = WLAN_CATEGORY_HT;
450 action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS;
451 switch (smps) {
452 case IEEE80211_SMPS_AUTOMATIC:
453 case IEEE80211_SMPS_NUM_MODES:
454 WARN_ON(1);
455 case IEEE80211_SMPS_OFF:
456 action_frame->u.action.u.ht_smps.smps_control =
457 WLAN_HT_SMPS_CONTROL_DISABLED;
458 break;
459 case IEEE80211_SMPS_STATIC:
460 action_frame->u.action.u.ht_smps.smps_control =
461 WLAN_HT_SMPS_CONTROL_STATIC;
462 break;
463 case IEEE80211_SMPS_DYNAMIC:
464 action_frame->u.action.u.ht_smps.smps_control =
465 WLAN_HT_SMPS_CONTROL_DYNAMIC;
466 break;
467 }
468
469 /* we'll do more on status of this frame */
470 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
471 ieee80211_tx_skb(sdata, skb);
472
473 return 0;
474}
475
476void ieee80211_request_smps_mgd_work(struct work_struct *work)
477{
478 struct ieee80211_sub_if_data *sdata =
479 container_of(work, struct ieee80211_sub_if_data,
480 u.mgd.request_smps_work);
481
482 sdata_lock(sdata);
483 __ieee80211_request_smps_mgd(sdata, sdata->u.mgd.driver_smps_mode);
484 sdata_unlock(sdata);
485}
486
487void ieee80211_request_smps_ap_work(struct work_struct *work)
488{
489 struct ieee80211_sub_if_data *sdata =
490 container_of(work, struct ieee80211_sub_if_data,
491 u.ap.request_smps_work);
492
493 sdata_lock(sdata);
494 if (sdata_dereference(sdata->u.ap.beacon, sdata))
495 __ieee80211_request_smps_ap(sdata,
496 sdata->u.ap.driver_smps_mode);
497 sdata_unlock(sdata);
498}
499
500void ieee80211_request_smps(struct ieee80211_vif *vif,
501 enum ieee80211_smps_mode smps_mode)
502{
503 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
504
505 if (WARN_ON_ONCE(vif->type != NL80211_IFTYPE_STATION &&
506 vif->type != NL80211_IFTYPE_AP))
507 return;
508
509 if (vif->type == NL80211_IFTYPE_STATION) {
510 if (sdata->u.mgd.driver_smps_mode == smps_mode)
511 return;
512 sdata->u.mgd.driver_smps_mode = smps_mode;
513 ieee80211_queue_work(&sdata->local->hw,
514 &sdata->u.mgd.request_smps_work);
515 } else {
516 /* AUTOMATIC is meaningless in AP mode */
517 if (WARN_ON_ONCE(smps_mode == IEEE80211_SMPS_AUTOMATIC))
518 return;
519 if (sdata->u.ap.driver_smps_mode == smps_mode)
520 return;
521 sdata->u.ap.driver_smps_mode = smps_mode;
522 ieee80211_queue_work(&sdata->local->hw,
523 &sdata->u.ap.request_smps_work);
524 }
525}
526/* this might change ... don't want non-open drivers using it */
527EXPORT_SYMBOL_GPL(ieee80211_request_smps);
1/*
2 * HT handling
3 *
4 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
5 * Copyright 2002-2005, Instant802 Networks, Inc.
6 * Copyright 2005-2006, Devicescape Software, Inc.
7 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
8 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
9 * Copyright 2007-2010, Intel Corporation
10 * Copyright 2017 Intel Deutschland GmbH
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
15 */
16
17#include <linux/ieee80211.h>
18#include <linux/export.h>
19#include <net/mac80211.h>
20#include "ieee80211_i.h"
21#include "rate.h"
22
23static void __check_htcap_disable(struct ieee80211_ht_cap *ht_capa,
24 struct ieee80211_ht_cap *ht_capa_mask,
25 struct ieee80211_sta_ht_cap *ht_cap,
26 u16 flag)
27{
28 __le16 le_flag = cpu_to_le16(flag);
29 if (ht_capa_mask->cap_info & le_flag) {
30 if (!(ht_capa->cap_info & le_flag))
31 ht_cap->cap &= ~flag;
32 }
33}
34
35static void __check_htcap_enable(struct ieee80211_ht_cap *ht_capa,
36 struct ieee80211_ht_cap *ht_capa_mask,
37 struct ieee80211_sta_ht_cap *ht_cap,
38 u16 flag)
39{
40 __le16 le_flag = cpu_to_le16(flag);
41
42 if ((ht_capa_mask->cap_info & le_flag) &&
43 (ht_capa->cap_info & le_flag))
44 ht_cap->cap |= flag;
45}
46
47void ieee80211_apply_htcap_overrides(struct ieee80211_sub_if_data *sdata,
48 struct ieee80211_sta_ht_cap *ht_cap)
49{
50 struct ieee80211_ht_cap *ht_capa, *ht_capa_mask;
51 u8 *scaps, *smask;
52 int i;
53
54 if (!ht_cap->ht_supported)
55 return;
56
57 switch (sdata->vif.type) {
58 case NL80211_IFTYPE_STATION:
59 ht_capa = &sdata->u.mgd.ht_capa;
60 ht_capa_mask = &sdata->u.mgd.ht_capa_mask;
61 break;
62 case NL80211_IFTYPE_ADHOC:
63 ht_capa = &sdata->u.ibss.ht_capa;
64 ht_capa_mask = &sdata->u.ibss.ht_capa_mask;
65 break;
66 default:
67 WARN_ON_ONCE(1);
68 return;
69 }
70
71 scaps = (u8 *)(&ht_capa->mcs.rx_mask);
72 smask = (u8 *)(&ht_capa_mask->mcs.rx_mask);
73
74 /* NOTE: If you add more over-rides here, update register_hw
75 * ht_capa_mod_mask logic in main.c as well.
76 * And, if this method can ever change ht_cap.ht_supported, fix
77 * the check in ieee80211_add_ht_ie.
78 */
79
80 /* check for HT over-rides, MCS rates first. */
81 for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++) {
82 u8 m = smask[i];
83 ht_cap->mcs.rx_mask[i] &= ~m; /* turn off all masked bits */
84 /* Add back rates that are supported */
85 ht_cap->mcs.rx_mask[i] |= (m & scaps[i]);
86 }
87
88 /* Force removal of HT-40 capabilities? */
89 __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
90 IEEE80211_HT_CAP_SUP_WIDTH_20_40);
91 __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
92 IEEE80211_HT_CAP_SGI_40);
93
94 /* Allow user to disable SGI-20 (SGI-40 is handled above) */
95 __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
96 IEEE80211_HT_CAP_SGI_20);
97
98 /* Allow user to disable the max-AMSDU bit. */
99 __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
100 IEEE80211_HT_CAP_MAX_AMSDU);
101
102 /* Allow user to disable LDPC */
103 __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
104 IEEE80211_HT_CAP_LDPC_CODING);
105
106 /* Allow user to enable 40 MHz intolerant bit. */
107 __check_htcap_enable(ht_capa, ht_capa_mask, ht_cap,
108 IEEE80211_HT_CAP_40MHZ_INTOLERANT);
109
110 /* Allow user to decrease AMPDU factor */
111 if (ht_capa_mask->ampdu_params_info &
112 IEEE80211_HT_AMPDU_PARM_FACTOR) {
113 u8 n = ht_capa->ampdu_params_info &
114 IEEE80211_HT_AMPDU_PARM_FACTOR;
115 if (n < ht_cap->ampdu_factor)
116 ht_cap->ampdu_factor = n;
117 }
118
119 /* Allow the user to increase AMPDU density. */
120 if (ht_capa_mask->ampdu_params_info &
121 IEEE80211_HT_AMPDU_PARM_DENSITY) {
122 u8 n = (ht_capa->ampdu_params_info &
123 IEEE80211_HT_AMPDU_PARM_DENSITY)
124 >> IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT;
125 if (n > ht_cap->ampdu_density)
126 ht_cap->ampdu_density = n;
127 }
128}
129
130
131bool ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data *sdata,
132 struct ieee80211_supported_band *sband,
133 const struct ieee80211_ht_cap *ht_cap_ie,
134 struct sta_info *sta)
135{
136 struct ieee80211_sta_ht_cap ht_cap, own_cap;
137 u8 ampdu_info, tx_mcs_set_cap;
138 int i, max_tx_streams;
139 bool changed;
140 enum ieee80211_sta_rx_bandwidth bw;
141 enum ieee80211_smps_mode smps_mode;
142
143 memset(&ht_cap, 0, sizeof(ht_cap));
144
145 if (!ht_cap_ie || !sband->ht_cap.ht_supported)
146 goto apply;
147
148 ht_cap.ht_supported = true;
149
150 own_cap = sband->ht_cap;
151
152 /*
153 * If user has specified capability over-rides, take care
154 * of that if the station we're setting up is the AP or TDLS peer that
155 * we advertised a restricted capability set to. Override
156 * our own capabilities and then use those below.
157 */
158 if (sdata->vif.type == NL80211_IFTYPE_STATION ||
159 sdata->vif.type == NL80211_IFTYPE_ADHOC)
160 ieee80211_apply_htcap_overrides(sdata, &own_cap);
161
162 /*
163 * The bits listed in this expression should be
164 * the same for the peer and us, if the station
165 * advertises more then we can't use those thus
166 * we mask them out.
167 */
168 ht_cap.cap = le16_to_cpu(ht_cap_ie->cap_info) &
169 (own_cap.cap | ~(IEEE80211_HT_CAP_LDPC_CODING |
170 IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
171 IEEE80211_HT_CAP_GRN_FLD |
172 IEEE80211_HT_CAP_SGI_20 |
173 IEEE80211_HT_CAP_SGI_40 |
174 IEEE80211_HT_CAP_DSSSCCK40));
175
176 /*
177 * The STBC bits are asymmetric -- if we don't have
178 * TX then mask out the peer's RX and vice versa.
179 */
180 if (!(own_cap.cap & IEEE80211_HT_CAP_TX_STBC))
181 ht_cap.cap &= ~IEEE80211_HT_CAP_RX_STBC;
182 if (!(own_cap.cap & IEEE80211_HT_CAP_RX_STBC))
183 ht_cap.cap &= ~IEEE80211_HT_CAP_TX_STBC;
184
185 ampdu_info = ht_cap_ie->ampdu_params_info;
186 ht_cap.ampdu_factor =
187 ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR;
188 ht_cap.ampdu_density =
189 (ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2;
190
191 /* own MCS TX capabilities */
192 tx_mcs_set_cap = own_cap.mcs.tx_params;
193
194 /* Copy peer MCS TX capabilities, the driver might need them. */
195 ht_cap.mcs.tx_params = ht_cap_ie->mcs.tx_params;
196
197 /* can we TX with MCS rates? */
198 if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED))
199 goto apply;
200
201 /* Counting from 0, therefore +1 */
202 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF)
203 max_tx_streams =
204 ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
205 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
206 else
207 max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS;
208
209 /*
210 * 802.11n-2009 20.3.5 / 20.6 says:
211 * - indices 0 to 7 and 32 are single spatial stream
212 * - 8 to 31 are multiple spatial streams using equal modulation
213 * [8..15 for two streams, 16..23 for three and 24..31 for four]
214 * - remainder are multiple spatial streams using unequal modulation
215 */
216 for (i = 0; i < max_tx_streams; i++)
217 ht_cap.mcs.rx_mask[i] =
218 own_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i];
219
220 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION)
221 for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE;
222 i < IEEE80211_HT_MCS_MASK_LEN; i++)
223 ht_cap.mcs.rx_mask[i] =
224 own_cap.mcs.rx_mask[i] &
225 ht_cap_ie->mcs.rx_mask[i];
226
227 /* handle MCS rate 32 too */
228 if (own_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1)
229 ht_cap.mcs.rx_mask[32/8] |= 1;
230
231 /* set Rx highest rate */
232 ht_cap.mcs.rx_highest = ht_cap_ie->mcs.rx_highest;
233
234 if (ht_cap.cap & IEEE80211_HT_CAP_MAX_AMSDU)
235 sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_7935;
236 else
237 sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_3839;
238
239 apply:
240 changed = memcmp(&sta->sta.ht_cap, &ht_cap, sizeof(ht_cap));
241
242 memcpy(&sta->sta.ht_cap, &ht_cap, sizeof(ht_cap));
243
244 switch (sdata->vif.bss_conf.chandef.width) {
245 default:
246 WARN_ON_ONCE(1);
247 /* fall through */
248 case NL80211_CHAN_WIDTH_20_NOHT:
249 case NL80211_CHAN_WIDTH_20:
250 bw = IEEE80211_STA_RX_BW_20;
251 break;
252 case NL80211_CHAN_WIDTH_40:
253 case NL80211_CHAN_WIDTH_80:
254 case NL80211_CHAN_WIDTH_80P80:
255 case NL80211_CHAN_WIDTH_160:
256 bw = ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
257 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
258 break;
259 }
260
261 sta->sta.bandwidth = bw;
262
263 sta->cur_max_bandwidth =
264 ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
265 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
266
267 switch ((ht_cap.cap & IEEE80211_HT_CAP_SM_PS)
268 >> IEEE80211_HT_CAP_SM_PS_SHIFT) {
269 case WLAN_HT_CAP_SM_PS_INVALID:
270 case WLAN_HT_CAP_SM_PS_STATIC:
271 smps_mode = IEEE80211_SMPS_STATIC;
272 break;
273 case WLAN_HT_CAP_SM_PS_DYNAMIC:
274 smps_mode = IEEE80211_SMPS_DYNAMIC;
275 break;
276 case WLAN_HT_CAP_SM_PS_DISABLED:
277 smps_mode = IEEE80211_SMPS_OFF;
278 break;
279 }
280
281 if (smps_mode != sta->sta.smps_mode)
282 changed = true;
283 sta->sta.smps_mode = smps_mode;
284
285 return changed;
286}
287
288void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta,
289 enum ieee80211_agg_stop_reason reason)
290{
291 int i;
292
293 mutex_lock(&sta->ampdu_mlme.mtx);
294 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
295 ___ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
296 WLAN_REASON_QSTA_LEAVE_QBSS,
297 reason != AGG_STOP_DESTROY_STA &&
298 reason != AGG_STOP_PEER_REQUEST);
299
300 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
301 ___ieee80211_stop_tx_ba_session(sta, i, reason);
302 mutex_unlock(&sta->ampdu_mlme.mtx);
303
304 /* stopping might queue the work again - so cancel only afterwards */
305 cancel_work_sync(&sta->ampdu_mlme.work);
306
307 /*
308 * In case the tear down is part of a reconfigure due to HW restart
309 * request, it is possible that the low level driver requested to stop
310 * the BA session, so handle it to properly clean tid_tx data.
311 */
312 mutex_lock(&sta->ampdu_mlme.mtx);
313 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
314 struct tid_ampdu_tx *tid_tx =
315 rcu_dereference_protected_tid_tx(sta, i);
316
317 if (!tid_tx)
318 continue;
319
320 if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state))
321 ieee80211_stop_tx_ba_cb(sta, i, tid_tx);
322 }
323 mutex_unlock(&sta->ampdu_mlme.mtx);
324}
325
326void ieee80211_ba_session_work(struct work_struct *work)
327{
328 struct sta_info *sta =
329 container_of(work, struct sta_info, ampdu_mlme.work);
330 struct tid_ampdu_tx *tid_tx;
331 int tid;
332
333 /*
334 * When this flag is set, new sessions should be
335 * blocked, and existing sessions will be torn
336 * down by the code that set the flag, so this
337 * need not run.
338 */
339 if (test_sta_flag(sta, WLAN_STA_BLOCK_BA))
340 return;
341
342 mutex_lock(&sta->ampdu_mlme.mtx);
343 for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
344 if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired))
345 ___ieee80211_stop_rx_ba_session(
346 sta, tid, WLAN_BACK_RECIPIENT,
347 WLAN_REASON_QSTA_TIMEOUT, true);
348
349 if (test_and_clear_bit(tid,
350 sta->ampdu_mlme.tid_rx_stop_requested))
351 ___ieee80211_stop_rx_ba_session(
352 sta, tid, WLAN_BACK_RECIPIENT,
353 WLAN_REASON_UNSPECIFIED, true);
354
355 if (test_and_clear_bit(tid,
356 sta->ampdu_mlme.tid_rx_manage_offl))
357 ___ieee80211_start_rx_ba_session(sta, 0, 0, 0, 1, tid,
358 IEEE80211_MAX_AMPDU_BUF,
359 false, true);
360
361 if (test_and_clear_bit(tid + IEEE80211_NUM_TIDS,
362 sta->ampdu_mlme.tid_rx_manage_offl))
363 ___ieee80211_stop_rx_ba_session(
364 sta, tid, WLAN_BACK_RECIPIENT,
365 0, false);
366
367 spin_lock_bh(&sta->lock);
368
369 tid_tx = sta->ampdu_mlme.tid_start_tx[tid];
370 if (tid_tx) {
371 /*
372 * Assign it over to the normal tid_tx array
373 * where it "goes live".
374 */
375
376 sta->ampdu_mlme.tid_start_tx[tid] = NULL;
377 /* could there be a race? */
378 if (sta->ampdu_mlme.tid_tx[tid])
379 kfree(tid_tx);
380 else
381 ieee80211_assign_tid_tx(sta, tid, tid_tx);
382 spin_unlock_bh(&sta->lock);
383
384 ieee80211_tx_ba_session_handle_start(sta, tid);
385 continue;
386 }
387 spin_unlock_bh(&sta->lock);
388
389 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
390 if (!tid_tx)
391 continue;
392
393 if (test_and_clear_bit(HT_AGG_STATE_START_CB, &tid_tx->state))
394 ieee80211_start_tx_ba_cb(sta, tid, tid_tx);
395 if (test_and_clear_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state))
396 ___ieee80211_stop_tx_ba_session(sta, tid,
397 AGG_STOP_LOCAL_REQUEST);
398 if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state))
399 ieee80211_stop_tx_ba_cb(sta, tid, tid_tx);
400 }
401 mutex_unlock(&sta->ampdu_mlme.mtx);
402}
403
404void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
405 const u8 *da, u16 tid,
406 u16 initiator, u16 reason_code)
407{
408 struct ieee80211_local *local = sdata->local;
409 struct sk_buff *skb;
410 struct ieee80211_mgmt *mgmt;
411 u16 params;
412
413 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
414 if (!skb)
415 return;
416
417 skb_reserve(skb, local->hw.extra_tx_headroom);
418 mgmt = skb_put_zero(skb, 24);
419 memcpy(mgmt->da, da, ETH_ALEN);
420 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
421 if (sdata->vif.type == NL80211_IFTYPE_AP ||
422 sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
423 sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
424 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
425 else if (sdata->vif.type == NL80211_IFTYPE_STATION)
426 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
427 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
428 memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN);
429
430 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
431 IEEE80211_STYPE_ACTION);
432
433 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
434
435 mgmt->u.action.category = WLAN_CATEGORY_BACK;
436 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
437 params = (u16)(initiator << 11); /* bit 11 initiator */
438 params |= (u16)(tid << 12); /* bit 15:12 TID number */
439
440 mgmt->u.action.u.delba.params = cpu_to_le16(params);
441 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
442
443 ieee80211_tx_skb(sdata, skb);
444}
445
446void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
447 struct sta_info *sta,
448 struct ieee80211_mgmt *mgmt, size_t len)
449{
450 u16 tid, params;
451 u16 initiator;
452
453 params = le16_to_cpu(mgmt->u.action.u.delba.params);
454 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
455 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
456
457 ht_dbg_ratelimited(sdata, "delba from %pM (%s) tid %d reason code %d\n",
458 mgmt->sa, initiator ? "initiator" : "recipient",
459 tid,
460 le16_to_cpu(mgmt->u.action.u.delba.reason_code));
461
462 if (initiator == WLAN_BACK_INITIATOR)
463 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0,
464 true);
465 else
466 __ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_PEER_REQUEST);
467}
468
469enum nl80211_smps_mode
470ieee80211_smps_mode_to_smps_mode(enum ieee80211_smps_mode smps)
471{
472 switch (smps) {
473 case IEEE80211_SMPS_OFF:
474 return NL80211_SMPS_OFF;
475 case IEEE80211_SMPS_STATIC:
476 return NL80211_SMPS_STATIC;
477 case IEEE80211_SMPS_DYNAMIC:
478 return NL80211_SMPS_DYNAMIC;
479 default:
480 return NL80211_SMPS_OFF;
481 }
482}
483
484int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,
485 enum ieee80211_smps_mode smps, const u8 *da,
486 const u8 *bssid)
487{
488 struct ieee80211_local *local = sdata->local;
489 struct sk_buff *skb;
490 struct ieee80211_mgmt *action_frame;
491
492 /* 27 = header + category + action + smps mode */
493 skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom);
494 if (!skb)
495 return -ENOMEM;
496
497 skb_reserve(skb, local->hw.extra_tx_headroom);
498 action_frame = skb_put(skb, 27);
499 memcpy(action_frame->da, da, ETH_ALEN);
500 memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN);
501 memcpy(action_frame->bssid, bssid, ETH_ALEN);
502 action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
503 IEEE80211_STYPE_ACTION);
504 action_frame->u.action.category = WLAN_CATEGORY_HT;
505 action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS;
506 switch (smps) {
507 case IEEE80211_SMPS_AUTOMATIC:
508 case IEEE80211_SMPS_NUM_MODES:
509 WARN_ON(1);
510 /* fall through */
511 case IEEE80211_SMPS_OFF:
512 action_frame->u.action.u.ht_smps.smps_control =
513 WLAN_HT_SMPS_CONTROL_DISABLED;
514 break;
515 case IEEE80211_SMPS_STATIC:
516 action_frame->u.action.u.ht_smps.smps_control =
517 WLAN_HT_SMPS_CONTROL_STATIC;
518 break;
519 case IEEE80211_SMPS_DYNAMIC:
520 action_frame->u.action.u.ht_smps.smps_control =
521 WLAN_HT_SMPS_CONTROL_DYNAMIC;
522 break;
523 }
524
525 /* we'll do more on status of this frame */
526 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
527 ieee80211_tx_skb(sdata, skb);
528
529 return 0;
530}
531
532void ieee80211_request_smps_mgd_work(struct work_struct *work)
533{
534 struct ieee80211_sub_if_data *sdata =
535 container_of(work, struct ieee80211_sub_if_data,
536 u.mgd.request_smps_work);
537
538 sdata_lock(sdata);
539 __ieee80211_request_smps_mgd(sdata, sdata->u.mgd.driver_smps_mode);
540 sdata_unlock(sdata);
541}
542
543void ieee80211_request_smps_ap_work(struct work_struct *work)
544{
545 struct ieee80211_sub_if_data *sdata =
546 container_of(work, struct ieee80211_sub_if_data,
547 u.ap.request_smps_work);
548
549 sdata_lock(sdata);
550 if (sdata_dereference(sdata->u.ap.beacon, sdata))
551 __ieee80211_request_smps_ap(sdata,
552 sdata->u.ap.driver_smps_mode);
553 sdata_unlock(sdata);
554}
555
556void ieee80211_request_smps(struct ieee80211_vif *vif,
557 enum ieee80211_smps_mode smps_mode)
558{
559 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
560
561 if (WARN_ON_ONCE(vif->type != NL80211_IFTYPE_STATION &&
562 vif->type != NL80211_IFTYPE_AP))
563 return;
564
565 if (vif->type == NL80211_IFTYPE_STATION) {
566 if (sdata->u.mgd.driver_smps_mode == smps_mode)
567 return;
568 sdata->u.mgd.driver_smps_mode = smps_mode;
569 ieee80211_queue_work(&sdata->local->hw,
570 &sdata->u.mgd.request_smps_work);
571 } else {
572 /* AUTOMATIC is meaningless in AP mode */
573 if (WARN_ON_ONCE(smps_mode == IEEE80211_SMPS_AUTOMATIC))
574 return;
575 if (sdata->u.ap.driver_smps_mode == smps_mode)
576 return;
577 sdata->u.ap.driver_smps_mode = smps_mode;
578 ieee80211_queue_work(&sdata->local->hw,
579 &sdata->u.ap.request_smps_work);
580 }
581}
582/* this might change ... don't want non-open drivers using it */
583EXPORT_SYMBOL_GPL(ieee80211_request_smps);