net/mac80211/ht.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * HT handling
   4  *
   5  * Copyright 2003, Jouni Malinen <[email protected]>
   6  * Copyright 2002-2005, Instant802 Networks, Inc.
   7  * Copyright 2005-2006, Devicescape Software, Inc.
   8  * Copyright 2006-2007  Jiri Benc <[email protected]>
   9  * Copyright 2007, Michael Wu <[email protected]>
  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                 link_sta->pub->agg.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_7935;
 245         else
 246                 link_sta->pub->agg.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_3839;
 247
 248         ieee80211_sta_recalc_aggregates(&sta->sta);
 249
 250  apply:
 251         changed = memcmp(&link_sta->pub->ht_cap, &ht_cap, sizeof(ht_cap));
 252
 253         memcpy(&link_sta->pub->ht_cap, &ht_cap, sizeof(ht_cap));
 254
 255         rcu_read_lock();
 256         link_conf = rcu_dereference(sdata->vif.link_conf[link_sta->link_id]);
 257         if (WARN_ON(!link_conf))
 258                 width = NL80211_CHAN_WIDTH_20_NOHT;
 259         else
 260                 width = link_conf->chandef.width;
 261
 262         switch (width) {
 263         default:
 264                 WARN_ON_ONCE(1);
 265                 fallthrough;
 266         case NL80211_CHAN_WIDTH_20_NOHT:
 267         case NL80211_CHAN_WIDTH_20:
 268                 bw = IEEE80211_STA_RX_BW_20;
 269                 break;
 270         case NL80211_CHAN_WIDTH_40:
 271         case NL80211_CHAN_WIDTH_80:
 272         case NL80211_CHAN_WIDTH_80P80:
 273         case NL80211_CHAN_WIDTH_160:
 274                 bw = ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
 275                                 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
 276                 break;
 277         }
 278         rcu_read_unlock();
 279
 280         link_sta->pub->bandwidth = bw;
 281
 282         link_sta->cur_max_bandwidth =
 283                 ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
 284                                 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
 285
 286         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
 287             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 288                 enum ieee80211_smps_mode smps_mode;
 289
 290                 switch ((ht_cap.cap & IEEE80211_HT_CAP_SM_PS)
 291                                 >> IEEE80211_HT_CAP_SM_PS_SHIFT) {
 292                 case WLAN_HT_CAP_SM_PS_INVALID:
 293                 case WLAN_HT_CAP_SM_PS_STATIC:
 294                         smps_mode = IEEE80211_SMPS_STATIC;
 295                         break;
 296                 case WLAN_HT_CAP_SM_PS_DYNAMIC:
 297                         smps_mode = IEEE80211_SMPS_DYNAMIC;
 298                         break;
 299                 case WLAN_HT_CAP_SM_PS_DISABLED:
 300                         smps_mode = IEEE80211_SMPS_OFF;
 301                         break;
 302                 }
 303
 304                 if (smps_mode != link_sta->pub->smps_mode)
 305                         changed = true;
 306                 link_sta->pub->smps_mode = smps_mode;
 307         } else {
 308                 link_sta->pub->smps_mode = IEEE80211_SMPS_OFF;
 309         }
 310
 311         return changed;
 312 }
 313
 314 void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta,
 315                                          enum ieee80211_agg_stop_reason reason)
 316 {
 317         int i;
 318
 319         mutex_lock(&sta->ampdu_mlme.mtx);
 320         for (i = 0; i <  IEEE80211_NUM_TIDS; i++)
 321                 ___ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
 322                                                 WLAN_REASON_QSTA_LEAVE_QBSS,
 323                                                 reason != AGG_STOP_DESTROY_STA &&
 324                                                 reason != AGG_STOP_PEER_REQUEST);
 325
 326         for (i = 0; i <  IEEE80211_NUM_TIDS; i++)
 327                 ___ieee80211_stop_tx_ba_session(sta, i, reason);
 328         mutex_unlock(&sta->ampdu_mlme.mtx);
 329
 330         /*
 331          * In case the tear down is part of a reconfigure due to HW restart
 332          * request, it is possible that the low level driver requested to stop
 333          * the BA session, so handle it to properly clean tid_tx data.
 334          */
 335         if(reason == AGG_STOP_DESTROY_STA) {
 336                 cancel_work_sync(&sta->ampdu_mlme.work);
 337
 338                 mutex_lock(&sta->ampdu_mlme.mtx);
 339                 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
 340                         struct tid_ampdu_tx *tid_tx =
 341                                 rcu_dereference_protected_tid_tx(sta, i);
 342
 343                         if (!tid_tx)
 344                                 continue;
 345
 346                         if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state))
 347                                 ieee80211_stop_tx_ba_cb(sta, i, tid_tx);
 348                 }
 349                 mutex_unlock(&sta->ampdu_mlme.mtx);
 350         }
 351 }
 352
 353 void ieee80211_ba_session_work(struct work_struct *work)
 354 {
 355         struct sta_info *sta =
 356                 container_of(work, struct sta_info, ampdu_mlme.work);
 357         struct tid_ampdu_tx *tid_tx;
 358         bool blocked;
 359         int tid;
 360
 361         /* When this flag is set, new sessions should be blocked. */
 362         blocked = test_sta_flag(sta, WLAN_STA_BLOCK_BA);
 363
 364         mutex_lock(&sta->ampdu_mlme.mtx);
 365         for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
 366                 if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired))
 367                         ___ieee80211_stop_rx_ba_session(
 368                                 sta, tid, WLAN_BACK_RECIPIENT,
 369                                 WLAN_REASON_QSTA_TIMEOUT, true);
 370
 371                 if (test_and_clear_bit(tid,
 372                                        sta->ampdu_mlme.tid_rx_stop_requested))
 373                         ___ieee80211_stop_rx_ba_session(
 374                                 sta, tid, WLAN_BACK_RECIPIENT,
 375                                 WLAN_REASON_UNSPECIFIED, true);
 376
 377                 if (!blocked &&
 378                     test_and_clear_bit(tid,
 379                                        sta->ampdu_mlme.tid_rx_manage_offl))
 380                         ___ieee80211_start_rx_ba_session(sta, 0, 0, 0, 1, tid,
 381                                                          IEEE80211_MAX_AMPDU_BUF_HT,
 382                                                          false, true, NULL);
 383
 384                 if (test_and_clear_bit(tid + IEEE80211_NUM_TIDS,
 385                                        sta->ampdu_mlme.tid_rx_manage_offl))
 386                         ___ieee80211_stop_rx_ba_session(
 387                                 sta, tid, WLAN_BACK_RECIPIENT,
 388                                 0, false);
 389
 390                 spin_lock_bh(&sta->lock);
 391
 392                 tid_tx = sta->ampdu_mlme.tid_start_tx[tid];
 393                 if (!blocked && tid_tx) {
 394                         /*
 395                          * Assign it over to the normal tid_tx array
 396                          * where it "goes live".
 397                          */
 398
 399                         sta->ampdu_mlme.tid_start_tx[tid] = NULL;
 400                         /* could there be a race? */
 401                         if (sta->ampdu_mlme.tid_tx[tid])
 402                                 kfree(tid_tx);
 403                         else
 404                                 ieee80211_assign_tid_tx(sta, tid, tid_tx);
 405                         spin_unlock_bh(&sta->lock);
 406
 407                         ieee80211_tx_ba_session_handle_start(sta, tid);
 408                         continue;
 409                 }
 410                 spin_unlock_bh(&sta->lock);
 411
 412                 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
 413                 if (!tid_tx)
 414                         continue;
 415
 416                 if (!blocked &&
 417                     test_and_clear_bit(HT_AGG_STATE_START_CB, &tid_tx->state))
 418                         ieee80211_start_tx_ba_cb(sta, tid, tid_tx);
 419                 if (test_and_clear_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state))
 420                         ___ieee80211_stop_tx_ba_session(sta, tid,
 421                                                         AGG_STOP_LOCAL_REQUEST);
 422                 if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state))
 423                         ieee80211_stop_tx_ba_cb(sta, tid, tid_tx);
 424         }
 425         mutex_unlock(&sta->ampdu_mlme.mtx);
 426 }
 427
 428 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
 429                           const u8 *da, u16 tid,
 430                           u16 initiator, u16 reason_code)
 431 {
 432         struct ieee80211_local *local = sdata->local;
 433         struct sk_buff *skb;
 434         struct ieee80211_mgmt *mgmt;
 435         u16 params;
 436
 437         skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
 438         if (!skb)
 439                 return;
 440
 441         skb_reserve(skb, local->hw.extra_tx_headroom);
 442         mgmt = skb_put_zero(skb, 24);
 443         memcpy(mgmt->da, da, ETH_ALEN);
 444         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 445         if (sdata->vif.type == NL80211_IFTYPE_AP ||
 446             sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
 447             sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
 448                 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
 449         else if (sdata->vif.type == NL80211_IFTYPE_STATION)
 450                 memcpy(mgmt->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN);
 451         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 452                 memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN);
 453
 454         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 455                                           IEEE80211_STYPE_ACTION);
 456
 457         skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
 458
 459         mgmt->u.action.category = WLAN_CATEGORY_BACK;
 460         mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
 461         params = (u16)(initiator << 11);        /* bit 11 initiator */
 462         params |= (u16)(tid << 12);             /* bit 15:12 TID number */
 463
 464         mgmt->u.action.u.delba.params = cpu_to_le16(params);
 465         mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
 466
 467         ieee80211_tx_skb(sdata, skb);
 468 }
 469
 470 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
 471                              struct sta_info *sta,
 472                              struct ieee80211_mgmt *mgmt, size_t len)
 473 {
 474         u16 tid, params;
 475         u16 initiator;
 476
 477         params = le16_to_cpu(mgmt->u.action.u.delba.params);
 478         tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
 479         initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
 480
 481         ht_dbg_ratelimited(sdata, "delba from %pM (%s) tid %d reason code %d\n",
 482                            mgmt->sa, initiator ? "initiator" : "recipient",
 483                            tid,
 484                            le16_to_cpu(mgmt->u.action.u.delba.reason_code));
 485
 486         if (initiator == WLAN_BACK_INITIATOR)
 487                 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0,
 488                                                true);
 489         else
 490                 __ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_PEER_REQUEST);
 491 }
 492
 493 enum nl80211_smps_mode
 494 ieee80211_smps_mode_to_smps_mode(enum ieee80211_smps_mode smps)
 495 {
 496         switch (smps) {
 497         case IEEE80211_SMPS_OFF:
 498                 return NL80211_SMPS_OFF;
 499         case IEEE80211_SMPS_STATIC:
 500                 return NL80211_SMPS_STATIC;
 501         case IEEE80211_SMPS_DYNAMIC:
 502                 return NL80211_SMPS_DYNAMIC;
 503         default:
 504                 return NL80211_SMPS_OFF;
 505         }
 506 }
 507
 508 int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,
 509                                enum ieee80211_smps_mode smps, const u8 *da,
 510                                const u8 *bssid)
 511 {
 512         struct ieee80211_local *local = sdata->local;
 513         struct sk_buff *skb;
 514         struct ieee80211_mgmt *action_frame;
 515
 516         /* 27 = header + category + action + smps mode */
 517         skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom);
 518         if (!skb)
 519                 return -ENOMEM;
 520
 521         skb_reserve(skb, local->hw.extra_tx_headroom);
 522         action_frame = skb_put(skb, 27);
 523         memcpy(action_frame->da, da, ETH_ALEN);
 524         memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN);
 525         memcpy(action_frame->bssid, bssid, ETH_ALEN);
 526         action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 527                                                   IEEE80211_STYPE_ACTION);
 528         action_frame->u.action.category = WLAN_CATEGORY_HT;
 529         action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS;
 530         switch (smps) {
 531         case IEEE80211_SMPS_AUTOMATIC:
 532         case IEEE80211_SMPS_NUM_MODES:
 533                 WARN_ON(1);
 534                 fallthrough;
 535         case IEEE80211_SMPS_OFF:
 536                 action_frame->u.action.u.ht_smps.smps_control =
 537                                 WLAN_HT_SMPS_CONTROL_DISABLED;
 538                 break;
 539         case IEEE80211_SMPS_STATIC:
 540                 action_frame->u.action.u.ht_smps.smps_control =
 541                                 WLAN_HT_SMPS_CONTROL_STATIC;
 542                 break;
 543         case IEEE80211_SMPS_DYNAMIC:
 544                 action_frame->u.action.u.ht_smps.smps_control =
 545                                 WLAN_HT_SMPS_CONTROL_DYNAMIC;
 546                 break;
 547         }
 548
 549         /* we'll do more on status of this frame */
 550         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 551         ieee80211_tx_skb(sdata, skb);
 552
 553         return 0;
 554 }
 555
 556 void ieee80211_request_smps(struct ieee80211_vif *vif, unsigned int link_id,
 557                             enum ieee80211_smps_mode smps_mode)
 558 {
 559         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 560         struct ieee80211_link_data *link;
 561
 562         if (WARN_ON_ONCE(vif->type != NL80211_IFTYPE_STATION))
 563                 return;
 564
 565         rcu_read_lock();
 566         link = rcu_dereference(sdata->link[link_id]);
 567         if (WARN_ON(!link))
 568                 goto out;
 569
 570         if (link->u.mgd.driver_smps_mode == smps_mode)
 571                 goto out;
 572
 573         link->u.mgd.driver_smps_mode = smps_mode;
 574         ieee80211_queue_work(&sdata->local->hw, &link->u.mgd.request_smps_work);
 575 out:
 576         rcu_read_unlock();
 577 }
 578 /* this might change ... don't want non-open drivers using it */
 579 EXPORT_SYMBOL_GPL(ieee80211_request_smps);