Merge branch 'work.dcache' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[linux-2.6-microblaze.git] / net / mac80211 / ht.c
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  */
13
14 #include <linux/ieee80211.h>
15 #include <linux/export.h>
16 #include <net/mac80211.h>
17 #include "ieee80211_i.h"
18 #include "rate.h"
19
20 static void __check_htcap_disable(struct ieee80211_ht_cap *ht_capa,
21                                   struct ieee80211_ht_cap *ht_capa_mask,
22                                   struct ieee80211_sta_ht_cap *ht_cap,
23                                   u16 flag)
24 {
25         __le16 le_flag = cpu_to_le16(flag);
26         if (ht_capa_mask->cap_info & le_flag) {
27                 if (!(ht_capa->cap_info & le_flag))
28                         ht_cap->cap &= ~flag;
29         }
30 }
31
32 static void __check_htcap_enable(struct ieee80211_ht_cap *ht_capa,
33                                   struct ieee80211_ht_cap *ht_capa_mask,
34                                   struct ieee80211_sta_ht_cap *ht_cap,
35                                   u16 flag)
36 {
37         __le16 le_flag = cpu_to_le16(flag);
38
39         if ((ht_capa_mask->cap_info & le_flag) &&
40             (ht_capa->cap_info & le_flag))
41                 ht_cap->cap |= flag;
42 }
43
44 void ieee80211_apply_htcap_overrides(struct ieee80211_sub_if_data *sdata,
45                                      struct ieee80211_sta_ht_cap *ht_cap)
46 {
47         struct ieee80211_ht_cap *ht_capa, *ht_capa_mask;
48         u8 *scaps, *smask;
49         int i;
50
51         if (!ht_cap->ht_supported)
52                 return;
53
54         switch (sdata->vif.type) {
55         case NL80211_IFTYPE_STATION:
56                 ht_capa = &sdata->u.mgd.ht_capa;
57                 ht_capa_mask = &sdata->u.mgd.ht_capa_mask;
58                 break;
59         case NL80211_IFTYPE_ADHOC:
60                 ht_capa = &sdata->u.ibss.ht_capa;
61                 ht_capa_mask = &sdata->u.ibss.ht_capa_mask;
62                 break;
63         default:
64                 WARN_ON_ONCE(1);
65                 return;
66         }
67
68         scaps = (u8 *)(&ht_capa->mcs.rx_mask);
69         smask = (u8 *)(&ht_capa_mask->mcs.rx_mask);
70
71         /* NOTE:  If you add more over-rides here, update register_hw
72          * ht_capa_mod_mask logic in main.c as well.
73          * And, if this method can ever change ht_cap.ht_supported, fix
74          * the check in ieee80211_add_ht_ie.
75          */
76
77         /* check for HT over-rides, MCS rates first. */
78         for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++) {
79                 u8 m = smask[i];
80                 ht_cap->mcs.rx_mask[i] &= ~m; /* turn off all masked bits */
81                 /* Add back rates that are supported */
82                 ht_cap->mcs.rx_mask[i] |= (m & scaps[i]);
83         }
84
85         /* Force removal of HT-40 capabilities? */
86         __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
87                               IEEE80211_HT_CAP_SUP_WIDTH_20_40);
88         __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
89                               IEEE80211_HT_CAP_SGI_40);
90
91         /* Allow user to disable SGI-20 (SGI-40 is handled above) */
92         __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
93                               IEEE80211_HT_CAP_SGI_20);
94
95         /* Allow user to disable the max-AMSDU bit. */
96         __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
97                               IEEE80211_HT_CAP_MAX_AMSDU);
98
99         /* Allow user to disable LDPC */
100         __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
101                               IEEE80211_HT_CAP_LDPC_CODING);
102
103         /* Allow user to enable 40 MHz intolerant bit. */
104         __check_htcap_enable(ht_capa, ht_capa_mask, ht_cap,
105                              IEEE80211_HT_CAP_40MHZ_INTOLERANT);
106
107         /* Allow user to enable TX STBC bit  */
108         __check_htcap_enable(ht_capa, ht_capa_mask, ht_cap,
109                              IEEE80211_HT_CAP_TX_STBC);
110
111         /* Allow user to configure RX STBC bits */
112         if (ht_capa_mask->cap_info & cpu_to_le16(IEEE80211_HT_CAP_RX_STBC))
113                 ht_cap->cap |= le16_to_cpu(ht_capa->cap_info) &
114                                         IEEE80211_HT_CAP_RX_STBC;
115
116         /* Allow user to decrease AMPDU factor */
117         if (ht_capa_mask->ampdu_params_info &
118             IEEE80211_HT_AMPDU_PARM_FACTOR) {
119                 u8 n = ht_capa->ampdu_params_info &
120                        IEEE80211_HT_AMPDU_PARM_FACTOR;
121                 if (n < ht_cap->ampdu_factor)
122                         ht_cap->ampdu_factor = n;
123         }
124
125         /* Allow the user to increase AMPDU density. */
126         if (ht_capa_mask->ampdu_params_info &
127             IEEE80211_HT_AMPDU_PARM_DENSITY) {
128                 u8 n = (ht_capa->ampdu_params_info &
129                         IEEE80211_HT_AMPDU_PARM_DENSITY)
130                         >> IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT;
131                 if (n > ht_cap->ampdu_density)
132                         ht_cap->ampdu_density = n;
133         }
134 }
135
136
137 bool ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data *sdata,
138                                        struct ieee80211_supported_band *sband,
139                                        const struct ieee80211_ht_cap *ht_cap_ie,
140                                        struct sta_info *sta)
141 {
142         struct ieee80211_sta_ht_cap ht_cap, own_cap;
143         u8 ampdu_info, tx_mcs_set_cap;
144         int i, max_tx_streams;
145         bool changed;
146         enum ieee80211_sta_rx_bandwidth bw;
147         enum ieee80211_smps_mode smps_mode;
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                 /* fall through */
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         switch ((ht_cap.cap & IEEE80211_HT_CAP_SM_PS)
274                         >> IEEE80211_HT_CAP_SM_PS_SHIFT) {
275         case WLAN_HT_CAP_SM_PS_INVALID:
276         case WLAN_HT_CAP_SM_PS_STATIC:
277                 smps_mode = IEEE80211_SMPS_STATIC;
278                 break;
279         case WLAN_HT_CAP_SM_PS_DYNAMIC:
280                 smps_mode = IEEE80211_SMPS_DYNAMIC;
281                 break;
282         case WLAN_HT_CAP_SM_PS_DISABLED:
283                 smps_mode = IEEE80211_SMPS_OFF;
284                 break;
285         }
286
287         if (smps_mode != sta->sta.smps_mode)
288                 changed = true;
289         sta->sta.smps_mode = smps_mode;
290
291         return changed;
292 }
293
294 void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta,
295                                          enum ieee80211_agg_stop_reason reason)
296 {
297         int i;
298
299         mutex_lock(&sta->ampdu_mlme.mtx);
300         for (i = 0; i <  IEEE80211_NUM_TIDS; i++)
301                 ___ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
302                                                 WLAN_REASON_QSTA_LEAVE_QBSS,
303                                                 reason != AGG_STOP_DESTROY_STA &&
304                                                 reason != AGG_STOP_PEER_REQUEST);
305
306         for (i = 0; i <  IEEE80211_NUM_TIDS; i++)
307                 ___ieee80211_stop_tx_ba_session(sta, i, reason);
308         mutex_unlock(&sta->ampdu_mlme.mtx);
309
310         /*
311          * In case the tear down is part of a reconfigure due to HW restart
312          * request, it is possible that the low level driver requested to stop
313          * the BA session, so handle it to properly clean tid_tx data.
314          */
315         if(reason == AGG_STOP_DESTROY_STA) {
316                 cancel_work_sync(&sta->ampdu_mlme.work);
317
318                 mutex_lock(&sta->ampdu_mlme.mtx);
319                 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
320                         struct tid_ampdu_tx *tid_tx =
321                                 rcu_dereference_protected_tid_tx(sta, i);
322
323                         if (!tid_tx)
324                                 continue;
325
326                         if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state))
327                                 ieee80211_stop_tx_ba_cb(sta, i, tid_tx);
328                 }
329                 mutex_unlock(&sta->ampdu_mlme.mtx);
330         }
331 }
332
333 void ieee80211_ba_session_work(struct work_struct *work)
334 {
335         struct sta_info *sta =
336                 container_of(work, struct sta_info, ampdu_mlme.work);
337         struct tid_ampdu_tx *tid_tx;
338         bool blocked;
339         int tid;
340
341         /* When this flag is set, new sessions should be blocked. */
342         blocked = test_sta_flag(sta, WLAN_STA_BLOCK_BA);
343
344         mutex_lock(&sta->ampdu_mlme.mtx);
345         for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
346                 if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired))
347                         ___ieee80211_stop_rx_ba_session(
348                                 sta, tid, WLAN_BACK_RECIPIENT,
349                                 WLAN_REASON_QSTA_TIMEOUT, true);
350
351                 if (test_and_clear_bit(tid,
352                                        sta->ampdu_mlme.tid_rx_stop_requested))
353                         ___ieee80211_stop_rx_ba_session(
354                                 sta, tid, WLAN_BACK_RECIPIENT,
355                                 WLAN_REASON_UNSPECIFIED, true);
356
357                 if (!blocked &&
358                     test_and_clear_bit(tid,
359                                        sta->ampdu_mlme.tid_rx_manage_offl))
360                         ___ieee80211_start_rx_ba_session(sta, 0, 0, 0, 1, tid,
361                                                          IEEE80211_MAX_AMPDU_BUF_HT,
362                                                          false, true, NULL);
363
364                 if (test_and_clear_bit(tid + IEEE80211_NUM_TIDS,
365                                        sta->ampdu_mlme.tid_rx_manage_offl))
366                         ___ieee80211_stop_rx_ba_session(
367                                 sta, tid, WLAN_BACK_RECIPIENT,
368                                 0, false);
369
370                 spin_lock_bh(&sta->lock);
371
372                 tid_tx = sta->ampdu_mlme.tid_start_tx[tid];
373                 if (!blocked && tid_tx) {
374                         /*
375                          * Assign it over to the normal tid_tx array
376                          * where it "goes live".
377                          */
378
379                         sta->ampdu_mlme.tid_start_tx[tid] = NULL;
380                         /* could there be a race? */
381                         if (sta->ampdu_mlme.tid_tx[tid])
382                                 kfree(tid_tx);
383                         else
384                                 ieee80211_assign_tid_tx(sta, tid, tid_tx);
385                         spin_unlock_bh(&sta->lock);
386
387                         ieee80211_tx_ba_session_handle_start(sta, tid);
388                         continue;
389                 }
390                 spin_unlock_bh(&sta->lock);
391
392                 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
393                 if (!tid_tx)
394                         continue;
395
396                 if (!blocked &&
397                     test_and_clear_bit(HT_AGG_STATE_START_CB, &tid_tx->state))
398                         ieee80211_start_tx_ba_cb(sta, tid, tid_tx);
399                 if (test_and_clear_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state))
400                         ___ieee80211_stop_tx_ba_session(sta, tid,
401                                                         AGG_STOP_LOCAL_REQUEST);
402                 if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state))
403                         ieee80211_stop_tx_ba_cb(sta, tid, tid_tx);
404         }
405         mutex_unlock(&sta->ampdu_mlme.mtx);
406 }
407
408 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
409                           const u8 *da, u16 tid,
410                           u16 initiator, u16 reason_code)
411 {
412         struct ieee80211_local *local = sdata->local;
413         struct sk_buff *skb;
414         struct ieee80211_mgmt *mgmt;
415         u16 params;
416
417         skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
418         if (!skb)
419                 return;
420
421         skb_reserve(skb, local->hw.extra_tx_headroom);
422         mgmt = skb_put_zero(skb, 24);
423         memcpy(mgmt->da, da, ETH_ALEN);
424         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
425         if (sdata->vif.type == NL80211_IFTYPE_AP ||
426             sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
427             sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
428                 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
429         else if (sdata->vif.type == NL80211_IFTYPE_STATION)
430                 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
431         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
432                 memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN);
433
434         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
435                                           IEEE80211_STYPE_ACTION);
436
437         skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
438
439         mgmt->u.action.category = WLAN_CATEGORY_BACK;
440         mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
441         params = (u16)(initiator << 11);        /* bit 11 initiator */
442         params |= (u16)(tid << 12);             /* bit 15:12 TID number */
443
444         mgmt->u.action.u.delba.params = cpu_to_le16(params);
445         mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
446
447         ieee80211_tx_skb(sdata, skb);
448 }
449
450 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
451                              struct sta_info *sta,
452                              struct ieee80211_mgmt *mgmt, size_t len)
453 {
454         u16 tid, params;
455         u16 initiator;
456
457         params = le16_to_cpu(mgmt->u.action.u.delba.params);
458         tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
459         initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
460
461         ht_dbg_ratelimited(sdata, "delba from %pM (%s) tid %d reason code %d\n",
462                            mgmt->sa, initiator ? "initiator" : "recipient",
463                            tid,
464                            le16_to_cpu(mgmt->u.action.u.delba.reason_code));
465
466         if (initiator == WLAN_BACK_INITIATOR)
467                 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0,
468                                                true);
469         else
470                 __ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_PEER_REQUEST);
471 }
472
473 enum nl80211_smps_mode
474 ieee80211_smps_mode_to_smps_mode(enum ieee80211_smps_mode smps)
475 {
476         switch (smps) {
477         case IEEE80211_SMPS_OFF:
478                 return NL80211_SMPS_OFF;
479         case IEEE80211_SMPS_STATIC:
480                 return NL80211_SMPS_STATIC;
481         case IEEE80211_SMPS_DYNAMIC:
482                 return NL80211_SMPS_DYNAMIC;
483         default:
484                 return NL80211_SMPS_OFF;
485         }
486 }
487
488 int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,
489                                enum ieee80211_smps_mode smps, const u8 *da,
490                                const u8 *bssid)
491 {
492         struct ieee80211_local *local = sdata->local;
493         struct sk_buff *skb;
494         struct ieee80211_mgmt *action_frame;
495
496         /* 27 = header + category + action + smps mode */
497         skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom);
498         if (!skb)
499                 return -ENOMEM;
500
501         skb_reserve(skb, local->hw.extra_tx_headroom);
502         action_frame = skb_put(skb, 27);
503         memcpy(action_frame->da, da, ETH_ALEN);
504         memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN);
505         memcpy(action_frame->bssid, bssid, ETH_ALEN);
506         action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
507                                                   IEEE80211_STYPE_ACTION);
508         action_frame->u.action.category = WLAN_CATEGORY_HT;
509         action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS;
510         switch (smps) {
511         case IEEE80211_SMPS_AUTOMATIC:
512         case IEEE80211_SMPS_NUM_MODES:
513                 WARN_ON(1);
514                 /* fall through */
515         case IEEE80211_SMPS_OFF:
516                 action_frame->u.action.u.ht_smps.smps_control =
517                                 WLAN_HT_SMPS_CONTROL_DISABLED;
518                 break;
519         case IEEE80211_SMPS_STATIC:
520                 action_frame->u.action.u.ht_smps.smps_control =
521                                 WLAN_HT_SMPS_CONTROL_STATIC;
522                 break;
523         case IEEE80211_SMPS_DYNAMIC:
524                 action_frame->u.action.u.ht_smps.smps_control =
525                                 WLAN_HT_SMPS_CONTROL_DYNAMIC;
526                 break;
527         }
528
529         /* we'll do more on status of this frame */
530         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
531         ieee80211_tx_skb(sdata, skb);
532
533         return 0;
534 }
535
536 void ieee80211_request_smps_mgd_work(struct work_struct *work)
537 {
538         struct ieee80211_sub_if_data *sdata =
539                 container_of(work, struct ieee80211_sub_if_data,
540                              u.mgd.request_smps_work);
541
542         sdata_lock(sdata);
543         __ieee80211_request_smps_mgd(sdata, sdata->u.mgd.driver_smps_mode);
544         sdata_unlock(sdata);
545 }
546
547 void ieee80211_request_smps_ap_work(struct work_struct *work)
548 {
549         struct ieee80211_sub_if_data *sdata =
550                 container_of(work, struct ieee80211_sub_if_data,
551                              u.ap.request_smps_work);
552
553         sdata_lock(sdata);
554         if (sdata_dereference(sdata->u.ap.beacon, sdata))
555                 __ieee80211_request_smps_ap(sdata,
556                                             sdata->u.ap.driver_smps_mode);
557         sdata_unlock(sdata);
558 }
559
560 void ieee80211_request_smps(struct ieee80211_vif *vif,
561                             enum ieee80211_smps_mode smps_mode)
562 {
563         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
564
565         if (WARN_ON_ONCE(vif->type != NL80211_IFTYPE_STATION &&
566                          vif->type != NL80211_IFTYPE_AP))
567                 return;
568
569         if (vif->type == NL80211_IFTYPE_STATION) {
570                 if (sdata->u.mgd.driver_smps_mode == smps_mode)
571                         return;
572                 sdata->u.mgd.driver_smps_mode = smps_mode;
573                 ieee80211_queue_work(&sdata->local->hw,
574                                      &sdata->u.mgd.request_smps_work);
575         } else {
576                 /* AUTOMATIC is meaningless in AP mode */
577                 if (WARN_ON_ONCE(smps_mode == IEEE80211_SMPS_AUTOMATIC))
578                         return;
579                 if (sdata->u.ap.driver_smps_mode == smps_mode)
580                         return;
581                 sdata->u.ap.driver_smps_mode = smps_mode;
582                 ieee80211_queue_work(&sdata->local->hw,
583                                      &sdata->u.ap.request_smps_work);
584         }
585 }
586 /* this might change ... don't want non-open drivers using it */
587 EXPORT_SYMBOL_GPL(ieee80211_request_smps);