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  * Copyright(c) 2020 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
  21 static 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
  33 static 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
  45 void 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
 138 bool 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
 300 void 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
 339 void 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
 414 void 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
 456 void 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
 479 enum nl80211_smps_mode
 480 ieee80211_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
 494 int 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
 542 void 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
 553 void 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                          vif->type != NL80211_IFTYPE_AP))
 560                 return;
 561
 562         if (vif->type == NL80211_IFTYPE_STATION) {
 563                 if (sdata->u.mgd.driver_smps_mode == smps_mode)
 564                         return;
 565                 sdata->u.mgd.driver_smps_mode = smps_mode;
 566                 ieee80211_queue_work(&sdata->local->hw,
 567                                      &sdata->u.mgd.request_smps_work);
 568         }
 569 }
 570 /* this might change ... don't want non-open drivers using it */
 571 EXPORT_SYMBOL_GPL(ieee80211_request_smps);