net/mac80211/ht.c

   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
  23 static 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
  35 static 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
  47 void 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 enable TX STBC bit  */
 111         __check_htcap_enable(ht_capa, ht_capa_mask, ht_cap,
 112                              IEEE80211_HT_CAP_TX_STBC);
 113
 114         /* Allow user to configure RX STBC bits */
 115         if (ht_capa_mask->cap_info & cpu_to_le16(IEEE80211_HT_CAP_RX_STBC))
 116                 ht_cap->cap |= le16_to_cpu(ht_capa->cap_info) &
 117                                         IEEE80211_HT_CAP_RX_STBC;
 118
 119         /* Allow user to decrease AMPDU factor */
 120         if (ht_capa_mask->ampdu_params_info &
 121             IEEE80211_HT_AMPDU_PARM_FACTOR) {
 122                 u8 n = ht_capa->ampdu_params_info &
 123                        IEEE80211_HT_AMPDU_PARM_FACTOR;
 124                 if (n < ht_cap->ampdu_factor)
 125                         ht_cap->ampdu_factor = n;
 126         }
 127
 128         /* Allow the user to increase AMPDU density. */
 129         if (ht_capa_mask->ampdu_params_info &
 130             IEEE80211_HT_AMPDU_PARM_DENSITY) {
 131                 u8 n = (ht_capa->ampdu_params_info &
 132                         IEEE80211_HT_AMPDU_PARM_DENSITY)
 133                         >> IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT;
 134                 if (n > ht_cap->ampdu_density)
 135                         ht_cap->ampdu_density = n;
 136         }
 137 }
 138
 139
 140 bool ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data *sdata,
 141                                        struct ieee80211_supported_band *sband,
 142                                        const struct ieee80211_ht_cap *ht_cap_ie,
 143                                        struct sta_info *sta)
 144 {
 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 ieee80211_smps_mode smps_mode;
 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                 sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_7935;
 245         else
 246                 sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_3839;
 247
 248  apply:
 249         changed = memcmp(&sta->sta.ht_cap, &ht_cap, sizeof(ht_cap));
 250
 251         memcpy(&sta->sta.ht_cap, &ht_cap, sizeof(ht_cap));
 252
 253         switch (sdata->vif.bss_conf.chandef.width) {
 254         default:
 255                 WARN_ON_ONCE(1);
 256                 /* fall through */
 257         case NL80211_CHAN_WIDTH_20_NOHT:
 258         case NL80211_CHAN_WIDTH_20:
 259                 bw = IEEE80211_STA_RX_BW_20;
 260                 break;
 261         case NL80211_CHAN_WIDTH_40:
 262         case NL80211_CHAN_WIDTH_80:
 263         case NL80211_CHAN_WIDTH_80P80:
 264         case NL80211_CHAN_WIDTH_160:
 265                 bw = ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
 266                                 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
 267                 break;
 268         }
 269
 270         sta->sta.bandwidth = bw;
 271
 272         sta->cur_max_bandwidth =
 273                 ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
 274                                 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
 275
 276         switch ((ht_cap.cap & IEEE80211_HT_CAP_SM_PS)
 277                         >> IEEE80211_HT_CAP_SM_PS_SHIFT) {
 278         case WLAN_HT_CAP_SM_PS_INVALID:
 279         case WLAN_HT_CAP_SM_PS_STATIC:
 280                 smps_mode = IEEE80211_SMPS_STATIC;
 281                 break;
 282         case WLAN_HT_CAP_SM_PS_DYNAMIC:
 283                 smps_mode = IEEE80211_SMPS_DYNAMIC;
 284                 break;
 285         case WLAN_HT_CAP_SM_PS_DISABLED:
 286                 smps_mode = IEEE80211_SMPS_OFF;
 287                 break;
 288         }
 289
 290         if (smps_mode != sta->sta.smps_mode)
 291                 changed = true;
 292         sta->sta.smps_mode = smps_mode;
 293
 294         return changed;
 295 }
 296
 297 void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta,
 298                                          enum ieee80211_agg_stop_reason reason)
 299 {
 300         int i;
 301
 302         mutex_lock(&sta->ampdu_mlme.mtx);
 303         for (i = 0; i <  IEEE80211_NUM_TIDS; i++)
 304                 ___ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
 305                                                 WLAN_REASON_QSTA_LEAVE_QBSS,
 306                                                 reason != AGG_STOP_DESTROY_STA &&
 307                                                 reason != AGG_STOP_PEER_REQUEST);
 308
 309         for (i = 0; i <  IEEE80211_NUM_TIDS; i++)
 310                 ___ieee80211_stop_tx_ba_session(sta, i, reason);
 311         mutex_unlock(&sta->ampdu_mlme.mtx);
 312
 313         /*
 314          * In case the tear down is part of a reconfigure due to HW restart
 315          * request, it is possible that the low level driver requested to stop
 316          * the BA session, so handle it to properly clean tid_tx data.
 317          */
 318         if(reason == AGG_STOP_DESTROY_STA) {
 319                 cancel_work_sync(&sta->ampdu_mlme.work);
 320
 321                 mutex_lock(&sta->ampdu_mlme.mtx);
 322                 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
 323                         struct tid_ampdu_tx *tid_tx =
 324                                 rcu_dereference_protected_tid_tx(sta, i);
 325
 326                         if (!tid_tx)
 327                                 continue;
 328
 329                         if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state))
 330                                 ieee80211_stop_tx_ba_cb(sta, i, tid_tx);
 331                 }
 332                 mutex_unlock(&sta->ampdu_mlme.mtx);
 333         }
 334 }
 335
 336 void ieee80211_ba_session_work(struct work_struct *work)
 337 {
 338         struct sta_info *sta =
 339                 container_of(work, struct sta_info, ampdu_mlme.work);
 340         struct tid_ampdu_tx *tid_tx;
 341         bool blocked;
 342         int tid;
 343
 344         /* When this flag is set, new sessions should be blocked. */
 345         blocked = test_sta_flag(sta, WLAN_STA_BLOCK_BA);
 346
 347         mutex_lock(&sta->ampdu_mlme.mtx);
 348         for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
 349                 if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired))
 350                         ___ieee80211_stop_rx_ba_session(
 351                                 sta, tid, WLAN_BACK_RECIPIENT,
 352                                 WLAN_REASON_QSTA_TIMEOUT, true);
 353
 354                 if (test_and_clear_bit(tid,
 355                                        sta->ampdu_mlme.tid_rx_stop_requested))
 356                         ___ieee80211_stop_rx_ba_session(
 357                                 sta, tid, WLAN_BACK_RECIPIENT,
 358                                 WLAN_REASON_UNSPECIFIED, true);
 359
 360                 if (!blocked &&
 361                     test_and_clear_bit(tid,
 362                                        sta->ampdu_mlme.tid_rx_manage_offl))
 363                         ___ieee80211_start_rx_ba_session(sta, 0, 0, 0, 1, tid,
 364                                                          IEEE80211_MAX_AMPDU_BUF_HT,
 365                                                          false, true);
 366
 367                 if (test_and_clear_bit(tid + IEEE80211_NUM_TIDS,
 368                                        sta->ampdu_mlme.tid_rx_manage_offl))
 369                         ___ieee80211_stop_rx_ba_session(
 370                                 sta, tid, WLAN_BACK_RECIPIENT,
 371                                 0, false);
 372
 373                 spin_lock_bh(&sta->lock);
 374
 375                 tid_tx = sta->ampdu_mlme.tid_start_tx[tid];
 376                 if (!blocked && tid_tx) {
 377                         /*
 378                          * Assign it over to the normal tid_tx array
 379                          * where it "goes live".
 380                          */
 381
 382                         sta->ampdu_mlme.tid_start_tx[tid] = NULL;
 383                         /* could there be a race? */
 384                         if (sta->ampdu_mlme.tid_tx[tid])
 385                                 kfree(tid_tx);
 386                         else
 387                                 ieee80211_assign_tid_tx(sta, tid, tid_tx);
 388                         spin_unlock_bh(&sta->lock);
 389
 390                         ieee80211_tx_ba_session_handle_start(sta, tid);
 391                         continue;
 392                 }
 393                 spin_unlock_bh(&sta->lock);
 394
 395                 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
 396                 if (!tid_tx)
 397                         continue;
 398
 399                 if (!blocked &&
 400                     test_and_clear_bit(HT_AGG_STATE_START_CB, &tid_tx->state))
 401                         ieee80211_start_tx_ba_cb(sta, tid, tid_tx);
 402                 if (test_and_clear_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state))
 403                         ___ieee80211_stop_tx_ba_session(sta, tid,
 404                                                         AGG_STOP_LOCAL_REQUEST);
 405                 if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state))
 406                         ieee80211_stop_tx_ba_cb(sta, tid, tid_tx);
 407         }
 408         mutex_unlock(&sta->ampdu_mlme.mtx);
 409 }
 410
 411 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
 412                           const u8 *da, u16 tid,
 413                           u16 initiator, u16 reason_code)
 414 {
 415         struct ieee80211_local *local = sdata->local;
 416         struct sk_buff *skb;
 417         struct ieee80211_mgmt *mgmt;
 418         u16 params;
 419
 420         skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
 421         if (!skb)
 422                 return;
 423
 424         skb_reserve(skb, local->hw.extra_tx_headroom);
 425         mgmt = skb_put_zero(skb, 24);
 426         memcpy(mgmt->da, da, ETH_ALEN);
 427         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 428         if (sdata->vif.type == NL80211_IFTYPE_AP ||
 429             sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
 430             sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
 431                 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
 432         else if (sdata->vif.type == NL80211_IFTYPE_STATION)
 433                 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
 434         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 435                 memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN);
 436
 437         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 438                                           IEEE80211_STYPE_ACTION);
 439
 440         skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
 441
 442         mgmt->u.action.category = WLAN_CATEGORY_BACK;
 443         mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
 444         params = (u16)(initiator << 11);        /* bit 11 initiator */
 445         params |= (u16)(tid << 12);             /* bit 15:12 TID number */
 446
 447         mgmt->u.action.u.delba.params = cpu_to_le16(params);
 448         mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
 449
 450         ieee80211_tx_skb(sdata, skb);
 451 }
 452
 453 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
 454                              struct sta_info *sta,
 455                              struct ieee80211_mgmt *mgmt, size_t len)
 456 {
 457         u16 tid, params;
 458         u16 initiator;
 459
 460         params = le16_to_cpu(mgmt->u.action.u.delba.params);
 461         tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
 462         initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
 463
 464         ht_dbg_ratelimited(sdata, "delba from %pM (%s) tid %d reason code %d\n",
 465                            mgmt->sa, initiator ? "initiator" : "recipient",
 466                            tid,
 467                            le16_to_cpu(mgmt->u.action.u.delba.reason_code));
 468
 469         if (initiator == WLAN_BACK_INITIATOR)
 470                 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0,
 471                                                true);
 472         else
 473                 __ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_PEER_REQUEST);
 474 }
 475
 476 enum nl80211_smps_mode
 477 ieee80211_smps_mode_to_smps_mode(enum ieee80211_smps_mode smps)
 478 {
 479         switch (smps) {
 480         case IEEE80211_SMPS_OFF:
 481                 return NL80211_SMPS_OFF;
 482         case IEEE80211_SMPS_STATIC:
 483                 return NL80211_SMPS_STATIC;
 484         case IEEE80211_SMPS_DYNAMIC:
 485                 return NL80211_SMPS_DYNAMIC;
 486         default:
 487                 return NL80211_SMPS_OFF;
 488         }
 489 }
 490
 491 int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,
 492                                enum ieee80211_smps_mode smps, const u8 *da,
 493                                const u8 *bssid)
 494 {
 495         struct ieee80211_local *local = sdata->local;
 496         struct sk_buff *skb;
 497         struct ieee80211_mgmt *action_frame;
 498
 499         /* 27 = header + category + action + smps mode */
 500         skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom);
 501         if (!skb)
 502                 return -ENOMEM;
 503
 504         skb_reserve(skb, local->hw.extra_tx_headroom);
 505         action_frame = skb_put(skb, 27);
 506         memcpy(action_frame->da, da, ETH_ALEN);
 507         memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN);
 508         memcpy(action_frame->bssid, bssid, ETH_ALEN);
 509         action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 510                                                   IEEE80211_STYPE_ACTION);
 511         action_frame->u.action.category = WLAN_CATEGORY_HT;
 512         action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS;
 513         switch (smps) {
 514         case IEEE80211_SMPS_AUTOMATIC:
 515         case IEEE80211_SMPS_NUM_MODES:
 516                 WARN_ON(1);
 517                 /* fall through */
 518         case IEEE80211_SMPS_OFF:
 519                 action_frame->u.action.u.ht_smps.smps_control =
 520                                 WLAN_HT_SMPS_CONTROL_DISABLED;
 521                 break;
 522         case IEEE80211_SMPS_STATIC:
 523                 action_frame->u.action.u.ht_smps.smps_control =
 524                                 WLAN_HT_SMPS_CONTROL_STATIC;
 525                 break;
 526         case IEEE80211_SMPS_DYNAMIC:
 527                 action_frame->u.action.u.ht_smps.smps_control =
 528                                 WLAN_HT_SMPS_CONTROL_DYNAMIC;
 529                 break;
 530         }
 531
 532         /* we'll do more on status of this frame */
 533         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 534         ieee80211_tx_skb(sdata, skb);
 535
 536         return 0;
 537 }
 538
 539 void ieee80211_request_smps_mgd_work(struct work_struct *work)
 540 {
 541         struct ieee80211_sub_if_data *sdata =
 542                 container_of(work, struct ieee80211_sub_if_data,
 543                              u.mgd.request_smps_work);
 544
 545         sdata_lock(sdata);
 546         __ieee80211_request_smps_mgd(sdata, sdata->u.mgd.driver_smps_mode);
 547         sdata_unlock(sdata);
 548 }
 549
 550 void ieee80211_request_smps_ap_work(struct work_struct *work)
 551 {
 552         struct ieee80211_sub_if_data *sdata =
 553                 container_of(work, struct ieee80211_sub_if_data,
 554                              u.ap.request_smps_work);
 555
 556         sdata_lock(sdata);
 557         if (sdata_dereference(sdata->u.ap.beacon, sdata))
 558                 __ieee80211_request_smps_ap(sdata,
 559                                             sdata->u.ap.driver_smps_mode);
 560         sdata_unlock(sdata);
 561 }
 562
 563 void ieee80211_request_smps(struct ieee80211_vif *vif,
 564                             enum ieee80211_smps_mode smps_mode)
 565 {
 566         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 567
 568         if (WARN_ON_ONCE(vif->type != NL80211_IFTYPE_STATION &&
 569                          vif->type != NL80211_IFTYPE_AP))
 570                 return;
 571
 572         if (vif->type == NL80211_IFTYPE_STATION) {
 573                 if (sdata->u.mgd.driver_smps_mode == smps_mode)
 574                         return;
 575                 sdata->u.mgd.driver_smps_mode = smps_mode;
 576                 ieee80211_queue_work(&sdata->local->hw,
 577                                      &sdata->u.mgd.request_smps_work);
 578         } else {
 579                 /* AUTOMATIC is meaningless in AP mode */
 580                 if (WARN_ON_ONCE(smps_mode == IEEE80211_SMPS_AUTOMATIC))
 581                         return;
 582                 if (sdata->u.ap.driver_smps_mode == smps_mode)
 583                         return;
 584                 sdata->u.ap.driver_smps_mode = smps_mode;
 585                 ieee80211_queue_work(&sdata->local->hw,
 586                                      &sdata->u.ap.request_smps_work);
 587         }
 588 }
 589 /* this might change ... don't want non-open drivers using it */
 590 EXPORT_SYMBOL_GPL(ieee80211_request_smps);