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) 2020-2022 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 link_sta_info *link_sta)
 142 {
 143         struct ieee80211_bss_conf *link_conf;
 144         struct sta_info *sta = link_sta->sta;
 145         struct ieee80211_sta_ht_cap ht_cap, own_cap;
 146         u8 ampdu_info, tx_mcs_set_cap;
 147         int i, max_tx_streams;
 148         bool changed;
 149         enum ieee80211_sta_rx_bandwidth bw;
 150         enum nl80211_chan_width width;
 151
 152         memset(&ht_cap, 0, sizeof(ht_cap));
 153
 154         if (!ht_cap_ie || !sband->ht_cap.ht_supported)
 155                 goto apply;
 156
 157         ht_cap.ht_supported = true;
 158
 159         own_cap = sband->ht_cap;
 160
 161         /*
 162          * If user has specified capability over-rides, take care
 163          * of that if the station we're setting up is the AP or TDLS peer that
 164          * we advertised a restricted capability set to. Override
 165          * our own capabilities and then use those below.
 166          */
 167         if (sdata->vif.type == NL80211_IFTYPE_STATION ||
 168             sdata->vif.type == NL80211_IFTYPE_ADHOC)
 169                 ieee80211_apply_htcap_overrides(sdata, &own_cap);
 170
 171         /*
 172          * The bits listed in this expression should be
 173          * the same for the peer and us, if the station
 174          * advertises more then we can't use those thus
 175          * we mask them out.
 176          */
 177         ht_cap.cap = le16_to_cpu(ht_cap_ie->cap_info) &
 178                 (own_cap.cap | ~(IEEE80211_HT_CAP_LDPC_CODING |
 179                                  IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
 180                                  IEEE80211_HT_CAP_GRN_FLD |
 181                                  IEEE80211_HT_CAP_SGI_20 |
 182                                  IEEE80211_HT_CAP_SGI_40 |
 183                                  IEEE80211_HT_CAP_DSSSCCK40));
 184
 185         /*
 186          * The STBC bits are asymmetric -- if we don't have
 187          * TX then mask out the peer's RX and vice versa.
 188          */
 189         if (!(own_cap.cap & IEEE80211_HT_CAP_TX_STBC))
 190                 ht_cap.cap &= ~IEEE80211_HT_CAP_RX_STBC;
 191         if (!(own_cap.cap & IEEE80211_HT_CAP_RX_STBC))
 192                 ht_cap.cap &= ~IEEE80211_HT_CAP_TX_STBC;
 193
 194         ampdu_info = ht_cap_ie->ampdu_params_info;
 195         ht_cap.ampdu_factor =
 196                 ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR;
 197         ht_cap.ampdu_density =
 198                 (ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2;
 199
 200         /* own MCS TX capabilities */
 201         tx_mcs_set_cap = own_cap.mcs.tx_params;
 202
 203         /* Copy peer MCS TX capabilities, the driver might need them. */
 204         ht_cap.mcs.tx_params = ht_cap_ie->mcs.tx_params;
 205
 206         /* can we TX with MCS rates? */
 207         if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED))
 208                 goto apply;
 209
 210         /* Counting from 0, therefore +1 */
 211         if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF)
 212                 max_tx_streams =
 213                         ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
 214                                 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
 215         else
 216                 max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS;
 217
 218         /*
 219          * 802.11n-2009 20.3.5 / 20.6 says:
 220          * - indices 0 to 7 and 32 are single spatial stream
 221          * - 8 to 31 are multiple spatial streams using equal modulation
 222          *   [8..15 for two streams, 16..23 for three and 24..31 for four]
 223          * - remainder are multiple spatial streams using unequal modulation
 224          */
 225         for (i = 0; i < max_tx_streams; i++)
 226                 ht_cap.mcs.rx_mask[i] =
 227                         own_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i];
 228
 229         if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION)
 230                 for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE;
 231                      i < IEEE80211_HT_MCS_MASK_LEN; i++)
 232                         ht_cap.mcs.rx_mask[i] =
 233                                 own_cap.mcs.rx_mask[i] &
 234                                         ht_cap_ie->mcs.rx_mask[i];
 235
 236         /* handle MCS rate 32 too */
 237         if (own_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1)
 238                 ht_cap.mcs.rx_mask[32/8] |= 1;
 239
 240         /* set Rx highest rate */
 241         ht_cap.mcs.rx_highest = ht_cap_ie->mcs.rx_highest;
 242
 243         if (ht_cap.cap & IEEE80211_HT_CAP_MAX_AMSDU)
 244                 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(&link_sta->pub->ht_cap, &ht_cap, sizeof(ht_cap));
 250
 251         memcpy(&link_sta->pub->ht_cap, &ht_cap, sizeof(ht_cap));
 252
 253         rcu_read_lock();
 254         link_conf = rcu_dereference(sdata->vif.link_conf[link_sta->link_id]);
 255         if (WARN_ON(!link_conf))
 256                 width = NL80211_CHAN_WIDTH_20_NOHT;
 257         else
 258                 width = link_conf->chandef.width;
 259
 260         switch (width) {
 261         default:
 262                 WARN_ON_ONCE(1);
 263                 fallthrough;
 264         case NL80211_CHAN_WIDTH_20_NOHT:
 265         case NL80211_CHAN_WIDTH_20:
 266                 bw = IEEE80211_STA_RX_BW_20;
 267                 break;
 268         case NL80211_CHAN_WIDTH_40:
 269         case NL80211_CHAN_WIDTH_80:
 270         case NL80211_CHAN_WIDTH_80P80:
 271         case NL80211_CHAN_WIDTH_160:
 272                 bw = ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
 273                                 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
 274                 break;
 275         }
 276         rcu_read_unlock();
 277
 278         link_sta->pub->bandwidth = bw;
 279
 280         link_sta->cur_max_bandwidth =
 281                 ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
 282                                 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
 283
 284         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
 285             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 286                 enum ieee80211_smps_mode smps_mode;
 287
 288                 switch ((ht_cap.cap & IEEE80211_HT_CAP_SM_PS)
 289                                 >> IEEE80211_HT_CAP_SM_PS_SHIFT) {
 290                 case WLAN_HT_CAP_SM_PS_INVALID:
 291                 case WLAN_HT_CAP_SM_PS_STATIC:
 292                         smps_mode = IEEE80211_SMPS_STATIC;
 293                         break;
 294                 case WLAN_HT_CAP_SM_PS_DYNAMIC:
 295                         smps_mode = IEEE80211_SMPS_DYNAMIC;
 296                         break;
 297                 case WLAN_HT_CAP_SM_PS_DISABLED:
 298                         smps_mode = IEEE80211_SMPS_OFF;
 299                         break;
 300                 }
 301
 302                 if (smps_mode != sta->sta.smps_mode)
 303                         changed = true;
 304                 sta->sta.smps_mode = smps_mode;
 305         } else {
 306                 sta->sta.smps_mode = IEEE80211_SMPS_OFF;
 307         }
 308         return changed;
 309 }
 310
 311 void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta,
 312                                          enum ieee80211_agg_stop_reason reason)
 313 {
 314         int i;
 315
 316         mutex_lock(&sta->ampdu_mlme.mtx);
 317         for (i = 0; i <  IEEE80211_NUM_TIDS; i++)
 318                 ___ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
 319                                                 WLAN_REASON_QSTA_LEAVE_QBSS,
 320                                                 reason != AGG_STOP_DESTROY_STA &&
 321                                                 reason != AGG_STOP_PEER_REQUEST);
 322
 323         for (i = 0; i <  IEEE80211_NUM_TIDS; i++)
 324                 ___ieee80211_stop_tx_ba_session(sta, i, reason);
 325         mutex_unlock(&sta->ampdu_mlme.mtx);
 326
 327         /*
 328          * In case the tear down is part of a reconfigure due to HW restart
 329          * request, it is possible that the low level driver requested to stop
 330          * the BA session, so handle it to properly clean tid_tx data.
 331          */
 332         if(reason == AGG_STOP_DESTROY_STA) {
 333                 cancel_work_sync(&sta->ampdu_mlme.work);
 334
 335                 mutex_lock(&sta->ampdu_mlme.mtx);
 336                 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
 337                         struct tid_ampdu_tx *tid_tx =
 338                                 rcu_dereference_protected_tid_tx(sta, i);
 339
 340                         if (!tid_tx)
 341                                 continue;
 342
 343                         if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state))
 344                                 ieee80211_stop_tx_ba_cb(sta, i, tid_tx);
 345                 }
 346                 mutex_unlock(&sta->ampdu_mlme.mtx);
 347         }
 348 }
 349
 350 void ieee80211_ba_session_work(struct work_struct *work)
 351 {
 352         struct sta_info *sta =
 353                 container_of(work, struct sta_info, ampdu_mlme.work);
 354         struct tid_ampdu_tx *tid_tx;
 355         bool blocked;
 356         int tid;
 357
 358         /* When this flag is set, new sessions should be blocked. */
 359         blocked = test_sta_flag(sta, WLAN_STA_BLOCK_BA);
 360
 361         mutex_lock(&sta->ampdu_mlme.mtx);
 362         for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
 363                 if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired))
 364                         ___ieee80211_stop_rx_ba_session(
 365                                 sta, tid, WLAN_BACK_RECIPIENT,
 366                                 WLAN_REASON_QSTA_TIMEOUT, true);
 367
 368                 if (test_and_clear_bit(tid,
 369                                        sta->ampdu_mlme.tid_rx_stop_requested))
 370                         ___ieee80211_stop_rx_ba_session(
 371                                 sta, tid, WLAN_BACK_RECIPIENT,
 372                                 WLAN_REASON_UNSPECIFIED, true);
 373
 374                 if (!blocked &&
 375                     test_and_clear_bit(tid,
 376                                        sta->ampdu_mlme.tid_rx_manage_offl))
 377                         ___ieee80211_start_rx_ba_session(sta, 0, 0, 0, 1, tid,
 378                                                          IEEE80211_MAX_AMPDU_BUF_HT,
 379                                                          false, true, NULL);
 380
 381                 if (test_and_clear_bit(tid + IEEE80211_NUM_TIDS,
 382                                        sta->ampdu_mlme.tid_rx_manage_offl))
 383                         ___ieee80211_stop_rx_ba_session(
 384                                 sta, tid, WLAN_BACK_RECIPIENT,
 385                                 0, false);
 386
 387                 spin_lock_bh(&sta->lock);
 388
 389                 tid_tx = sta->ampdu_mlme.tid_start_tx[tid];
 390                 if (!blocked && tid_tx) {
 391                         /*
 392                          * Assign it over to the normal tid_tx array
 393                          * where it "goes live".
 394                          */
 395
 396                         sta->ampdu_mlme.tid_start_tx[tid] = NULL;
 397                         /* could there be a race? */
 398                         if (sta->ampdu_mlme.tid_tx[tid])
 399                                 kfree(tid_tx);
 400                         else
 401                                 ieee80211_assign_tid_tx(sta, tid, tid_tx);
 402                         spin_unlock_bh(&sta->lock);
 403
 404                         ieee80211_tx_ba_session_handle_start(sta, tid);
 405                         continue;
 406                 }
 407                 spin_unlock_bh(&sta->lock);
 408
 409                 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
 410                 if (!tid_tx)
 411                         continue;
 412
 413                 if (!blocked &&
 414                     test_and_clear_bit(HT_AGG_STATE_START_CB, &tid_tx->state))
 415                         ieee80211_start_tx_ba_cb(sta, tid, tid_tx);
 416                 if (test_and_clear_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state))
 417                         ___ieee80211_stop_tx_ba_session(sta, tid,
 418                                                         AGG_STOP_LOCAL_REQUEST);
 419                 if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state))
 420                         ieee80211_stop_tx_ba_cb(sta, tid, tid_tx);
 421         }
 422         mutex_unlock(&sta->ampdu_mlme.mtx);
 423 }
 424
 425 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
 426                           const u8 *da, u16 tid,
 427                           u16 initiator, u16 reason_code)
 428 {
 429         struct ieee80211_local *local = sdata->local;
 430         struct sk_buff *skb;
 431         struct ieee80211_mgmt *mgmt;
 432         u16 params;
 433
 434         skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
 435         if (!skb)
 436                 return;
 437
 438         skb_reserve(skb, local->hw.extra_tx_headroom);
 439         mgmt = skb_put_zero(skb, 24);
 440         memcpy(mgmt->da, da, ETH_ALEN);
 441         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 442         if (sdata->vif.type == NL80211_IFTYPE_AP ||
 443             sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
 444             sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
 445                 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
 446         else if (sdata->vif.type == NL80211_IFTYPE_STATION)
 447                 memcpy(mgmt->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN);
 448         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 449                 memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN);
 450
 451         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 452                                           IEEE80211_STYPE_ACTION);
 453
 454         skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
 455
 456         mgmt->u.action.category = WLAN_CATEGORY_BACK;
 457         mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
 458         params = (u16)(initiator << 11);        /* bit 11 initiator */
 459         params |= (u16)(tid << 12);             /* bit 15:12 TID number */
 460
 461         mgmt->u.action.u.delba.params = cpu_to_le16(params);
 462         mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
 463
 464         ieee80211_tx_skb(sdata, skb);
 465 }
 466
 467 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
 468                              struct sta_info *sta,
 469                              struct ieee80211_mgmt *mgmt, size_t len)
 470 {
 471         u16 tid, params;
 472         u16 initiator;
 473
 474         params = le16_to_cpu(mgmt->u.action.u.delba.params);
 475         tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
 476         initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
 477
 478         ht_dbg_ratelimited(sdata, "delba from %pM (%s) tid %d reason code %d\n",
 479                            mgmt->sa, initiator ? "initiator" : "recipient",
 480                            tid,
 481                            le16_to_cpu(mgmt->u.action.u.delba.reason_code));
 482
 483         if (initiator == WLAN_BACK_INITIATOR)
 484                 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0,
 485                                                true);
 486         else
 487                 __ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_PEER_REQUEST);
 488 }
 489
 490 enum nl80211_smps_mode
 491 ieee80211_smps_mode_to_smps_mode(enum ieee80211_smps_mode smps)
 492 {
 493         switch (smps) {
 494         case IEEE80211_SMPS_OFF:
 495                 return NL80211_SMPS_OFF;
 496         case IEEE80211_SMPS_STATIC:
 497                 return NL80211_SMPS_STATIC;
 498         case IEEE80211_SMPS_DYNAMIC:
 499                 return NL80211_SMPS_DYNAMIC;
 500         default:
 501                 return NL80211_SMPS_OFF;
 502         }
 503 }
 504
 505 int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,
 506                                enum ieee80211_smps_mode smps, const u8 *da,
 507                                const u8 *bssid)
 508 {
 509         struct ieee80211_local *local = sdata->local;
 510         struct sk_buff *skb;
 511         struct ieee80211_mgmt *action_frame;
 512
 513         /* 27 = header + category + action + smps mode */
 514         skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom);
 515         if (!skb)
 516                 return -ENOMEM;
 517
 518         skb_reserve(skb, local->hw.extra_tx_headroom);
 519         action_frame = skb_put(skb, 27);
 520         memcpy(action_frame->da, da, ETH_ALEN);
 521         memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN);
 522         memcpy(action_frame->bssid, bssid, ETH_ALEN);
 523         action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 524                                                   IEEE80211_STYPE_ACTION);
 525         action_frame->u.action.category = WLAN_CATEGORY_HT;
 526         action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS;
 527         switch (smps) {
 528         case IEEE80211_SMPS_AUTOMATIC:
 529         case IEEE80211_SMPS_NUM_MODES:
 530                 WARN_ON(1);
 531                 fallthrough;
 532         case IEEE80211_SMPS_OFF:
 533                 action_frame->u.action.u.ht_smps.smps_control =
 534                                 WLAN_HT_SMPS_CONTROL_DISABLED;
 535                 break;
 536         case IEEE80211_SMPS_STATIC:
 537                 action_frame->u.action.u.ht_smps.smps_control =
 538                                 WLAN_HT_SMPS_CONTROL_STATIC;
 539                 break;
 540         case IEEE80211_SMPS_DYNAMIC:
 541                 action_frame->u.action.u.ht_smps.smps_control =
 542                                 WLAN_HT_SMPS_CONTROL_DYNAMIC;
 543                 break;
 544         }
 545
 546         /* we'll do more on status of this frame */
 547         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 548         ieee80211_tx_skb(sdata, skb);
 549
 550         return 0;
 551 }
 552
 553 void ieee80211_request_smps(struct ieee80211_vif *vif, unsigned int link_id,
 554                             enum ieee80211_smps_mode smps_mode)
 555 {
 556         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 557         struct ieee80211_link_data *link;
 558
 559         if (WARN_ON_ONCE(vif->type != NL80211_IFTYPE_STATION))
 560                 return;
 561
 562         rcu_read_lock();
 563         link = rcu_dereference(sdata->link[link_id]);
 564         if (WARN_ON(!link))
 565                 goto out;
 566
 567         if (link->u.mgd.driver_smps_mode == smps_mode)
 568                 goto out;
 569
 570         link->u.mgd.driver_smps_mode = smps_mode;
 571         ieee80211_queue_work(&sdata->local->hw, &link->u.mgd.request_smps_work);
 572 out:
 573         rcu_read_unlock();
 574 }
 575 /* this might change ... don't want non-open drivers using it */
 576 EXPORT_SYMBOL_GPL(ieee80211_request_smps);