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 sta_info *sta = link_sta->sta;
 144         struct ieee80211_sta_ht_cap ht_cap, own_cap;
 145         u8 ampdu_info, tx_mcs_set_cap;
 146         int i, max_tx_streams;
 147         bool changed;
 148         enum ieee80211_sta_rx_bandwidth bw;
 149
 150         memset(&ht_cap, 0, sizeof(ht_cap));
 151
 152         if (!ht_cap_ie || !sband->ht_cap.ht_supported)
 153                 goto apply;
 154
 155         ht_cap.ht_supported = true;
 156
 157         own_cap = sband->ht_cap;
 158
 159         /*
 160          * If user has specified capability over-rides, take care
 161          * of that if the station we're setting up is the AP or TDLS peer that
 162          * we advertised a restricted capability set to. Override
 163          * our own capabilities and then use those below.
 164          */
 165         if (sdata->vif.type == NL80211_IFTYPE_STATION ||
 166             sdata->vif.type == NL80211_IFTYPE_ADHOC)
 167                 ieee80211_apply_htcap_overrides(sdata, &own_cap);
 168
 169         /*
 170          * The bits listed in this expression should be
 171          * the same for the peer and us, if the station
 172          * advertises more then we can't use those thus
 173          * we mask them out.
 174          */
 175         ht_cap.cap = le16_to_cpu(ht_cap_ie->cap_info) &
 176                 (own_cap.cap | ~(IEEE80211_HT_CAP_LDPC_CODING |
 177                                  IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
 178                                  IEEE80211_HT_CAP_GRN_FLD |
 179                                  IEEE80211_HT_CAP_SGI_20 |
 180                                  IEEE80211_HT_CAP_SGI_40 |
 181                                  IEEE80211_HT_CAP_DSSSCCK40));
 182
 183         /*
 184          * The STBC bits are asymmetric -- if we don't have
 185          * TX then mask out the peer's RX and vice versa.
 186          */
 187         if (!(own_cap.cap & IEEE80211_HT_CAP_TX_STBC))
 188                 ht_cap.cap &= ~IEEE80211_HT_CAP_RX_STBC;
 189         if (!(own_cap.cap & IEEE80211_HT_CAP_RX_STBC))
 190                 ht_cap.cap &= ~IEEE80211_HT_CAP_TX_STBC;
 191
 192         ampdu_info = ht_cap_ie->ampdu_params_info;
 193         ht_cap.ampdu_factor =
 194                 ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR;
 195         ht_cap.ampdu_density =
 196                 (ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2;
 197
 198         /* own MCS TX capabilities */
 199         tx_mcs_set_cap = own_cap.mcs.tx_params;
 200
 201         /* Copy peer MCS TX capabilities, the driver might need them. */
 202         ht_cap.mcs.tx_params = ht_cap_ie->mcs.tx_params;
 203
 204         /* can we TX with MCS rates? */
 205         if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED))
 206                 goto apply;
 207
 208         /* Counting from 0, therefore +1 */
 209         if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF)
 210                 max_tx_streams =
 211                         ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
 212                                 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
 213         else
 214                 max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS;
 215
 216         /*
 217          * 802.11n-2009 20.3.5 / 20.6 says:
 218          * - indices 0 to 7 and 32 are single spatial stream
 219          * - 8 to 31 are multiple spatial streams using equal modulation
 220          *   [8..15 for two streams, 16..23 for three and 24..31 for four]
 221          * - remainder are multiple spatial streams using unequal modulation
 222          */
 223         for (i = 0; i < max_tx_streams; i++)
 224                 ht_cap.mcs.rx_mask[i] =
 225                         own_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i];
 226
 227         if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION)
 228                 for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE;
 229                      i < IEEE80211_HT_MCS_MASK_LEN; i++)
 230                         ht_cap.mcs.rx_mask[i] =
 231                                 own_cap.mcs.rx_mask[i] &
 232                                         ht_cap_ie->mcs.rx_mask[i];
 233
 234         /* handle MCS rate 32 too */
 235         if (own_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1)
 236                 ht_cap.mcs.rx_mask[32/8] |= 1;
 237
 238         /* set Rx highest rate */
 239         ht_cap.mcs.rx_highest = ht_cap_ie->mcs.rx_highest;
 240
 241         if (ht_cap.cap & IEEE80211_HT_CAP_MAX_AMSDU)
 242                 sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_7935;
 243         else
 244                 sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_3839;
 245
 246  apply:
 247         changed = memcmp(&link_sta->pub->ht_cap, &ht_cap, sizeof(ht_cap));
 248
 249         memcpy(&link_sta->pub->ht_cap, &ht_cap, sizeof(ht_cap));
 250
 251         switch (sdata->vif.link_conf[link_sta->link_id]->chandef.width) {
 252         default:
 253                 WARN_ON_ONCE(1);
 254                 fallthrough;
 255         case NL80211_CHAN_WIDTH_20_NOHT:
 256         case NL80211_CHAN_WIDTH_20:
 257                 bw = IEEE80211_STA_RX_BW_20;
 258                 break;
 259         case NL80211_CHAN_WIDTH_40:
 260         case NL80211_CHAN_WIDTH_80:
 261         case NL80211_CHAN_WIDTH_80P80:
 262         case NL80211_CHAN_WIDTH_160:
 263                 bw = ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
 264                                 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
 265                 break;
 266         }
 267
 268         link_sta->pub->bandwidth = bw;
 269
 270         link_sta->cur_max_bandwidth =
 271                 ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
 272                                 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
 273
 274         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
 275             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 276                 enum ieee80211_smps_mode smps_mode;
 277
 278                 switch ((ht_cap.cap & IEEE80211_HT_CAP_SM_PS)
 279                                 >> IEEE80211_HT_CAP_SM_PS_SHIFT) {
 280                 case WLAN_HT_CAP_SM_PS_INVALID:
 281                 case WLAN_HT_CAP_SM_PS_STATIC:
 282                         smps_mode = IEEE80211_SMPS_STATIC;
 283                         break;
 284                 case WLAN_HT_CAP_SM_PS_DYNAMIC:
 285                         smps_mode = IEEE80211_SMPS_DYNAMIC;
 286                         break;
 287                 case WLAN_HT_CAP_SM_PS_DISABLED:
 288                         smps_mode = IEEE80211_SMPS_OFF;
 289                         break;
 290                 }
 291
 292                 if (smps_mode != sta->sta.smps_mode)
 293                         changed = true;
 294                 sta->sta.smps_mode = smps_mode;
 295         } else {
 296                 sta->sta.smps_mode = IEEE80211_SMPS_OFF;
 297         }
 298         return changed;
 299 }
 300
 301 void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta,
 302                                          enum ieee80211_agg_stop_reason reason)
 303 {
 304         int i;
 305
 306         mutex_lock(&sta->ampdu_mlme.mtx);
 307         for (i = 0; i <  IEEE80211_NUM_TIDS; i++)
 308                 ___ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
 309                                                 WLAN_REASON_QSTA_LEAVE_QBSS,
 310                                                 reason != AGG_STOP_DESTROY_STA &&
 311                                                 reason != AGG_STOP_PEER_REQUEST);
 312
 313         for (i = 0; i <  IEEE80211_NUM_TIDS; i++)
 314                 ___ieee80211_stop_tx_ba_session(sta, i, reason);
 315         mutex_unlock(&sta->ampdu_mlme.mtx);
 316
 317         /*
 318          * In case the tear down is part of a reconfigure due to HW restart
 319          * request, it is possible that the low level driver requested to stop
 320          * the BA session, so handle it to properly clean tid_tx data.
 321          */
 322         if(reason == AGG_STOP_DESTROY_STA) {
 323                 cancel_work_sync(&sta->ampdu_mlme.work);
 324
 325                 mutex_lock(&sta->ampdu_mlme.mtx);
 326                 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
 327                         struct tid_ampdu_tx *tid_tx =
 328                                 rcu_dereference_protected_tid_tx(sta, i);
 329
 330                         if (!tid_tx)
 331                                 continue;
 332
 333                         if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state))
 334                                 ieee80211_stop_tx_ba_cb(sta, i, tid_tx);
 335                 }
 336                 mutex_unlock(&sta->ampdu_mlme.mtx);
 337         }
 338 }
 339
 340 void ieee80211_ba_session_work(struct work_struct *work)
 341 {
 342         struct sta_info *sta =
 343                 container_of(work, struct sta_info, ampdu_mlme.work);
 344         struct tid_ampdu_tx *tid_tx;
 345         bool blocked;
 346         int tid;
 347
 348         /* When this flag is set, new sessions should be blocked. */
 349         blocked = test_sta_flag(sta, WLAN_STA_BLOCK_BA);
 350
 351         mutex_lock(&sta->ampdu_mlme.mtx);
 352         for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
 353                 if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired))
 354                         ___ieee80211_stop_rx_ba_session(
 355                                 sta, tid, WLAN_BACK_RECIPIENT,
 356                                 WLAN_REASON_QSTA_TIMEOUT, true);
 357
 358                 if (test_and_clear_bit(tid,
 359                                        sta->ampdu_mlme.tid_rx_stop_requested))
 360                         ___ieee80211_stop_rx_ba_session(
 361                                 sta, tid, WLAN_BACK_RECIPIENT,
 362                                 WLAN_REASON_UNSPECIFIED, true);
 363
 364                 if (!blocked &&
 365                     test_and_clear_bit(tid,
 366                                        sta->ampdu_mlme.tid_rx_manage_offl))
 367                         ___ieee80211_start_rx_ba_session(sta, 0, 0, 0, 1, tid,
 368                                                          IEEE80211_MAX_AMPDU_BUF_HT,
 369                                                          false, true, NULL);
 370
 371                 if (test_and_clear_bit(tid + IEEE80211_NUM_TIDS,
 372                                        sta->ampdu_mlme.tid_rx_manage_offl))
 373                         ___ieee80211_stop_rx_ba_session(
 374                                 sta, tid, WLAN_BACK_RECIPIENT,
 375                                 0, false);
 376
 377                 spin_lock_bh(&sta->lock);
 378
 379                 tid_tx = sta->ampdu_mlme.tid_start_tx[tid];
 380                 if (!blocked && tid_tx) {
 381                         /*
 382                          * Assign it over to the normal tid_tx array
 383                          * where it "goes live".
 384                          */
 385
 386                         sta->ampdu_mlme.tid_start_tx[tid] = NULL;
 387                         /* could there be a race? */
 388                         if (sta->ampdu_mlme.tid_tx[tid])
 389                                 kfree(tid_tx);
 390                         else
 391                                 ieee80211_assign_tid_tx(sta, tid, tid_tx);
 392                         spin_unlock_bh(&sta->lock);
 393
 394                         ieee80211_tx_ba_session_handle_start(sta, tid);
 395                         continue;
 396                 }
 397                 spin_unlock_bh(&sta->lock);
 398
 399                 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
 400                 if (!tid_tx)
 401                         continue;
 402
 403                 if (!blocked &&
 404                     test_and_clear_bit(HT_AGG_STATE_START_CB, &tid_tx->state))
 405                         ieee80211_start_tx_ba_cb(sta, tid, tid_tx);
 406                 if (test_and_clear_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state))
 407                         ___ieee80211_stop_tx_ba_session(sta, tid,
 408                                                         AGG_STOP_LOCAL_REQUEST);
 409                 if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state))
 410                         ieee80211_stop_tx_ba_cb(sta, tid, tid_tx);
 411         }
 412         mutex_unlock(&sta->ampdu_mlme.mtx);
 413 }
 414
 415 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
 416                           const u8 *da, u16 tid,
 417                           u16 initiator, u16 reason_code)
 418 {
 419         struct ieee80211_local *local = sdata->local;
 420         struct sk_buff *skb;
 421         struct ieee80211_mgmt *mgmt;
 422         u16 params;
 423
 424         skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
 425         if (!skb)
 426                 return;
 427
 428         skb_reserve(skb, local->hw.extra_tx_headroom);
 429         mgmt = skb_put_zero(skb, 24);
 430         memcpy(mgmt->da, da, ETH_ALEN);
 431         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 432         if (sdata->vif.type == NL80211_IFTYPE_AP ||
 433             sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
 434             sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
 435                 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
 436         else if (sdata->vif.type == NL80211_IFTYPE_STATION)
 437                 memcpy(mgmt->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN);
 438         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 439                 memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN);
 440
 441         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 442                                           IEEE80211_STYPE_ACTION);
 443
 444         skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
 445
 446         mgmt->u.action.category = WLAN_CATEGORY_BACK;
 447         mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
 448         params = (u16)(initiator << 11);        /* bit 11 initiator */
 449         params |= (u16)(tid << 12);             /* bit 15:12 TID number */
 450
 451         mgmt->u.action.u.delba.params = cpu_to_le16(params);
 452         mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
 453
 454         ieee80211_tx_skb(sdata, skb);
 455 }
 456
 457 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
 458                              struct sta_info *sta,
 459                              struct ieee80211_mgmt *mgmt, size_t len)
 460 {
 461         u16 tid, params;
 462         u16 initiator;
 463
 464         params = le16_to_cpu(mgmt->u.action.u.delba.params);
 465         tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
 466         initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
 467
 468         ht_dbg_ratelimited(sdata, "delba from %pM (%s) tid %d reason code %d\n",
 469                            mgmt->sa, initiator ? "initiator" : "recipient",
 470                            tid,
 471                            le16_to_cpu(mgmt->u.action.u.delba.reason_code));
 472
 473         if (initiator == WLAN_BACK_INITIATOR)
 474                 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0,
 475                                                true);
 476         else
 477                 __ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_PEER_REQUEST);
 478 }
 479
 480 enum nl80211_smps_mode
 481 ieee80211_smps_mode_to_smps_mode(enum ieee80211_smps_mode smps)
 482 {
 483         switch (smps) {
 484         case IEEE80211_SMPS_OFF:
 485                 return NL80211_SMPS_OFF;
 486         case IEEE80211_SMPS_STATIC:
 487                 return NL80211_SMPS_STATIC;
 488         case IEEE80211_SMPS_DYNAMIC:
 489                 return NL80211_SMPS_DYNAMIC;
 490         default:
 491                 return NL80211_SMPS_OFF;
 492         }
 493 }
 494
 495 int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,
 496                                enum ieee80211_smps_mode smps, const u8 *da,
 497                                const u8 *bssid)
 498 {
 499         struct ieee80211_local *local = sdata->local;
 500         struct sk_buff *skb;
 501         struct ieee80211_mgmt *action_frame;
 502
 503         /* 27 = header + category + action + smps mode */
 504         skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom);
 505         if (!skb)
 506                 return -ENOMEM;
 507
 508         skb_reserve(skb, local->hw.extra_tx_headroom);
 509         action_frame = skb_put(skb, 27);
 510         memcpy(action_frame->da, da, ETH_ALEN);
 511         memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN);
 512         memcpy(action_frame->bssid, bssid, ETH_ALEN);
 513         action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 514                                                   IEEE80211_STYPE_ACTION);
 515         action_frame->u.action.category = WLAN_CATEGORY_HT;
 516         action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS;
 517         switch (smps) {
 518         case IEEE80211_SMPS_AUTOMATIC:
 519         case IEEE80211_SMPS_NUM_MODES:
 520                 WARN_ON(1);
 521                 fallthrough;
 522         case IEEE80211_SMPS_OFF:
 523                 action_frame->u.action.u.ht_smps.smps_control =
 524                                 WLAN_HT_SMPS_CONTROL_DISABLED;
 525                 break;
 526         case IEEE80211_SMPS_STATIC:
 527                 action_frame->u.action.u.ht_smps.smps_control =
 528                                 WLAN_HT_SMPS_CONTROL_STATIC;
 529                 break;
 530         case IEEE80211_SMPS_DYNAMIC:
 531                 action_frame->u.action.u.ht_smps.smps_control =
 532                                 WLAN_HT_SMPS_CONTROL_DYNAMIC;
 533                 break;
 534         }
 535
 536         /* we'll do more on status of this frame */
 537         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 538         ieee80211_tx_skb(sdata, skb);
 539
 540         return 0;
 541 }
 542
 543 void ieee80211_request_smps_mgd_work(struct work_struct *work)
 544 {
 545         struct ieee80211_link_data *link =
 546                 container_of(work, struct ieee80211_link_data,
 547                              u.mgd.request_smps_work);
 548
 549         sdata_lock(link->sdata);
 550         __ieee80211_request_smps_mgd(link->sdata, link->link_id,
 551                                      link->u.mgd.driver_smps_mode);
 552         sdata_unlock(link->sdata);
 553 }
 554
 555 void ieee80211_request_smps(struct ieee80211_vif *vif, unsigned int link_id,
 556                             enum ieee80211_smps_mode smps_mode)
 557 {
 558         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 559         struct ieee80211_link_data *link = sdata->link[link_id];
 560
 561         if (WARN_ON_ONCE(vif->type != NL80211_IFTYPE_STATION))
 562                 return;
 563
 564         if (WARN_ON(!link))
 565                 return;
 566
 567         if (link->u.mgd.driver_smps_mode == smps_mode)
 568                 return;
 569
 570         link->u.mgd.driver_smps_mode = smps_mode;
 571         ieee80211_queue_work(&sdata->local->hw, &link->u.mgd.request_smps_work);
 572 }
 573 /* this might change ... don't want non-open drivers using it */
 574 EXPORT_SYMBOL_GPL(ieee80211_request_smps);