net/mac80211/vht.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * VHT handling
   4  *
   5  * Portions of this file
   6  * Copyright(c) 2015 - 2016 Intel Deutschland GmbH
   7  * Copyright (C) 2018 - 2022 Intel Corporation
   8  */
   9
  10 #include <linux/ieee80211.h>
  11 #include <linux/export.h>
  12 #include <net/mac80211.h>
  13 #include "ieee80211_i.h"
  14 #include "rate.h"
  15
  16
  17 static void __check_vhtcap_disable(struct ieee80211_sub_if_data *sdata,
  18                                    struct ieee80211_sta_vht_cap *vht_cap,
  19                                    u32 flag)
  20 {
  21         __le32 le_flag = cpu_to_le32(flag);
  22
  23         if (sdata->u.mgd.vht_capa_mask.vht_cap_info & le_flag &&
  24             !(sdata->u.mgd.vht_capa.vht_cap_info & le_flag))
  25                 vht_cap->cap &= ~flag;
  26 }
  27
  28 void ieee80211_apply_vhtcap_overrides(struct ieee80211_sub_if_data *sdata,
  29                                       struct ieee80211_sta_vht_cap *vht_cap)
  30 {
  31         int i;
  32         u16 rxmcs_mask, rxmcs_cap, rxmcs_n, txmcs_mask, txmcs_cap, txmcs_n;
  33
  34         if (!vht_cap->vht_supported)
  35                 return;
  36
  37         if (sdata->vif.type != NL80211_IFTYPE_STATION)
  38                 return;
  39
  40         __check_vhtcap_disable(sdata, vht_cap,
  41                                IEEE80211_VHT_CAP_RXLDPC);
  42         __check_vhtcap_disable(sdata, vht_cap,
  43                                IEEE80211_VHT_CAP_SHORT_GI_80);
  44         __check_vhtcap_disable(sdata, vht_cap,
  45                                IEEE80211_VHT_CAP_SHORT_GI_160);
  46         __check_vhtcap_disable(sdata, vht_cap,
  47                                IEEE80211_VHT_CAP_TXSTBC);
  48         __check_vhtcap_disable(sdata, vht_cap,
  49                                IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE);
  50         __check_vhtcap_disable(sdata, vht_cap,
  51                                IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE);
  52         __check_vhtcap_disable(sdata, vht_cap,
  53                                IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN);
  54         __check_vhtcap_disable(sdata, vht_cap,
  55                                IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN);
  56
  57         /* Allow user to decrease AMPDU length exponent */
  58         if (sdata->u.mgd.vht_capa_mask.vht_cap_info &
  59             cpu_to_le32(IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK)) {
  60                 u32 cap, n;
  61
  62                 n = le32_to_cpu(sdata->u.mgd.vht_capa.vht_cap_info) &
  63                         IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;
  64                 n >>= IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT;
  65                 cap = vht_cap->cap & IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;
  66                 cap >>= IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT;
  67
  68                 if (n < cap) {
  69                         vht_cap->cap &=
  70                                 ~IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;
  71                         vht_cap->cap |=
  72                                 n << IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT;
  73                 }
  74         }
  75
  76         /* Allow the user to decrease MCSes */
  77         rxmcs_mask =
  78                 le16_to_cpu(sdata->u.mgd.vht_capa_mask.supp_mcs.rx_mcs_map);
  79         rxmcs_n = le16_to_cpu(sdata->u.mgd.vht_capa.supp_mcs.rx_mcs_map);
  80         rxmcs_n &= rxmcs_mask;
  81         rxmcs_cap = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map);
  82
  83         txmcs_mask =
  84                 le16_to_cpu(sdata->u.mgd.vht_capa_mask.supp_mcs.tx_mcs_map);
  85         txmcs_n = le16_to_cpu(sdata->u.mgd.vht_capa.supp_mcs.tx_mcs_map);
  86         txmcs_n &= txmcs_mask;
  87         txmcs_cap = le16_to_cpu(vht_cap->vht_mcs.tx_mcs_map);
  88         for (i = 0; i < 8; i++) {
  89                 u8 m, n, c;
  90
  91                 m = (rxmcs_mask >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
  92                 n = (rxmcs_n >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
  93                 c = (rxmcs_cap >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
  94
  95                 if (m && ((c != IEEE80211_VHT_MCS_NOT_SUPPORTED && n < c) ||
  96                           n == IEEE80211_VHT_MCS_NOT_SUPPORTED)) {
  97                         rxmcs_cap &= ~(3 << 2*i);
  98                         rxmcs_cap |= (rxmcs_n & (3 << 2*i));
  99                 }
 100
 101                 m = (txmcs_mask >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
 102                 n = (txmcs_n >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
 103                 c = (txmcs_cap >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
 104
 105                 if (m && ((c != IEEE80211_VHT_MCS_NOT_SUPPORTED && n < c) ||
 106                           n == IEEE80211_VHT_MCS_NOT_SUPPORTED)) {
 107                         txmcs_cap &= ~(3 << 2*i);
 108                         txmcs_cap |= (txmcs_n & (3 << 2*i));
 109                 }
 110         }
 111         vht_cap->vht_mcs.rx_mcs_map = cpu_to_le16(rxmcs_cap);
 112         vht_cap->vht_mcs.tx_mcs_map = cpu_to_le16(txmcs_cap);
 113 }
 114
 115 void
 116 ieee80211_vht_cap_ie_to_sta_vht_cap(struct ieee80211_sub_if_data *sdata,
 117                                     struct ieee80211_supported_band *sband,
 118                                     const struct ieee80211_vht_cap *vht_cap_ie,
 119                                     struct link_sta_info *link_sta)
 120 {
 121         struct ieee80211_sta_vht_cap *vht_cap = &link_sta->pub->vht_cap;
 122         struct ieee80211_sta_vht_cap own_cap;
 123         u32 cap_info, i;
 124         bool have_80mhz;
 125
 126         memset(vht_cap, 0, sizeof(*vht_cap));
 127
 128         if (!link_sta->pub->ht_cap.ht_supported)
 129                 return;
 130
 131         if (!vht_cap_ie || !sband->vht_cap.vht_supported)
 132                 return;
 133
 134         /* Allow VHT if at least one channel on the sband supports 80 MHz */
 135         have_80mhz = false;
 136         for (i = 0; i < sband->n_channels; i++) {
 137                 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
 138                                                 IEEE80211_CHAN_NO_80MHZ))
 139                         continue;
 140
 141                 have_80mhz = true;
 142                 break;
 143         }
 144
 145         if (!have_80mhz)
 146                 return;
 147
 148         /*
 149          * A VHT STA must support 40 MHz, but if we verify that here
 150          * then we break a few things - some APs (e.g. Netgear R6300v2
 151          * and others based on the BCM4360 chipset) will unset this
 152          * capability bit when operating in 20 MHz.
 153          */
 154
 155         vht_cap->vht_supported = true;
 156
 157         own_cap = sband->vht_cap;
 158         /*
 159          * If user has specified capability overrides, take care
 160          * of that if the station we're setting up is the AP 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             !test_sta_flag(link_sta->sta, WLAN_STA_TDLS_PEER))
 166                 ieee80211_apply_vhtcap_overrides(sdata, &own_cap);
 167
 168         /* take some capabilities as-is */
 169         cap_info = le32_to_cpu(vht_cap_ie->vht_cap_info);
 170         vht_cap->cap = cap_info;
 171         vht_cap->cap &= IEEE80211_VHT_CAP_RXLDPC |
 172                         IEEE80211_VHT_CAP_VHT_TXOP_PS |
 173                         IEEE80211_VHT_CAP_HTC_VHT |
 174                         IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK |
 175                         IEEE80211_VHT_CAP_VHT_LINK_ADAPTATION_VHT_UNSOL_MFB |
 176                         IEEE80211_VHT_CAP_VHT_LINK_ADAPTATION_VHT_MRQ_MFB |
 177                         IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN |
 178                         IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN;
 179
 180         vht_cap->cap |= min_t(u32, cap_info & IEEE80211_VHT_CAP_MAX_MPDU_MASK,
 181                               own_cap.cap & IEEE80211_VHT_CAP_MAX_MPDU_MASK);
 182
 183         /* and some based on our own capabilities */
 184         switch (own_cap.cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) {
 185         case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ:
 186                 vht_cap->cap |= cap_info &
 187                                 IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 188                 break;
 189         case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ:
 190                 vht_cap->cap |= cap_info &
 191                                 IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 192                 break;
 193         default:
 194                 /* nothing */
 195                 break;
 196         }
 197
 198         /* symmetric capabilities */
 199         vht_cap->cap |= cap_info & own_cap.cap &
 200                         (IEEE80211_VHT_CAP_SHORT_GI_80 |
 201                          IEEE80211_VHT_CAP_SHORT_GI_160);
 202
 203         /* remaining ones */
 204         if (own_cap.cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE)
 205                 vht_cap->cap |= cap_info &
 206                                 (IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE |
 207                                  IEEE80211_VHT_CAP_SOUNDING_DIMENSIONS_MASK);
 208
 209         if (own_cap.cap & IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)
 210                 vht_cap->cap |= cap_info &
 211                                 (IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
 212                                  IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK);
 213
 214         if (own_cap.cap & IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)
 215                 vht_cap->cap |= cap_info &
 216                                 IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
 217
 218         if (own_cap.cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE)
 219                 vht_cap->cap |= cap_info &
 220                                 IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE;
 221
 222         if (own_cap.cap & IEEE80211_VHT_CAP_TXSTBC)
 223                 vht_cap->cap |= cap_info & IEEE80211_VHT_CAP_RXSTBC_MASK;
 224
 225         if (own_cap.cap & IEEE80211_VHT_CAP_RXSTBC_MASK)
 226                 vht_cap->cap |= cap_info & IEEE80211_VHT_CAP_TXSTBC;
 227
 228         /* Copy peer MCS info, the driver might need them. */
 229         memcpy(&vht_cap->vht_mcs, &vht_cap_ie->supp_mcs,
 230                sizeof(struct ieee80211_vht_mcs_info));
 231
 232         /* copy EXT_NSS_BW Support value or remove the capability */
 233         if (ieee80211_hw_check(&sdata->local->hw, SUPPORTS_VHT_EXT_NSS_BW))
 234                 vht_cap->cap |= (cap_info & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK);
 235         else
 236                 vht_cap->vht_mcs.tx_highest &=
 237                         ~cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE);
 238
 239         /* but also restrict MCSes */
 240         for (i = 0; i < 8; i++) {
 241                 u16 own_rx, own_tx, peer_rx, peer_tx;
 242
 243                 own_rx = le16_to_cpu(own_cap.vht_mcs.rx_mcs_map);
 244                 own_rx = (own_rx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
 245
 246                 own_tx = le16_to_cpu(own_cap.vht_mcs.tx_mcs_map);
 247                 own_tx = (own_tx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
 248
 249                 peer_rx = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map);
 250                 peer_rx = (peer_rx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
 251
 252                 peer_tx = le16_to_cpu(vht_cap->vht_mcs.tx_mcs_map);
 253                 peer_tx = (peer_tx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
 254
 255                 if (peer_tx != IEEE80211_VHT_MCS_NOT_SUPPORTED) {
 256                         if (own_rx == IEEE80211_VHT_MCS_NOT_SUPPORTED)
 257                                 peer_tx = IEEE80211_VHT_MCS_NOT_SUPPORTED;
 258                         else if (own_rx < peer_tx)
 259                                 peer_tx = own_rx;
 260                 }
 261
 262                 if (peer_rx != IEEE80211_VHT_MCS_NOT_SUPPORTED) {
 263                         if (own_tx == IEEE80211_VHT_MCS_NOT_SUPPORTED)
 264                                 peer_rx = IEEE80211_VHT_MCS_NOT_SUPPORTED;
 265                         else if (own_tx < peer_rx)
 266                                 peer_rx = own_tx;
 267                 }
 268
 269                 vht_cap->vht_mcs.rx_mcs_map &=
 270                         ~cpu_to_le16(IEEE80211_VHT_MCS_NOT_SUPPORTED << i * 2);
 271                 vht_cap->vht_mcs.rx_mcs_map |= cpu_to_le16(peer_rx << i * 2);
 272
 273                 vht_cap->vht_mcs.tx_mcs_map &=
 274                         ~cpu_to_le16(IEEE80211_VHT_MCS_NOT_SUPPORTED << i * 2);
 275                 vht_cap->vht_mcs.tx_mcs_map |= cpu_to_le16(peer_tx << i * 2);
 276         }
 277
 278         /*
 279          * This is a workaround for VHT-enabled STAs which break the spec
 280          * and have the VHT-MCS Rx map filled in with value 3 for all eight
 281          * spacial streams, an example is AR9462.
 282          *
 283          * As per spec, in section 22.1.1 Introduction to the VHT PHY
 284          * A VHT STA shall support at least single spactial stream VHT-MCSs
 285          * 0 to 7 (transmit and receive) in all supported channel widths.
 286          */
 287         if (vht_cap->vht_mcs.rx_mcs_map == cpu_to_le16(0xFFFF)) {
 288                 vht_cap->vht_supported = false;
 289                 sdata_info(sdata,
 290                            "Ignoring VHT IE from %pM (link:%pM) due to invalid rx_mcs_map\n",
 291                            link_sta->sta->addr, link_sta->addr);
 292                 return;
 293         }
 294
 295         /* finally set up the bandwidth */
 296         switch (vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) {
 297         case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ:
 298         case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ:
 299                 link_sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160;
 300                 break;
 301         default:
 302                 link_sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80;
 303
 304                 if (!(vht_cap->vht_mcs.tx_highest &
 305                                 cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE)))
 306                         break;
 307
 308                 /*
 309                  * If this is non-zero, then it does support 160 MHz after all,
 310                  * in one form or the other. We don't distinguish here (or even
 311                  * above) between 160 and 80+80 yet.
 312                  */
 313                 if (cap_info & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK)
 314                         link_sta->cur_max_bandwidth =
 315                                 IEEE80211_STA_RX_BW_160;
 316         }
 317
 318         link_sta->pub->bandwidth = ieee80211_sta_cur_vht_bw(link_sta);
 319
 320         /*
 321          * FIXME - should the amsdu len be per link? store per link
 322          * and maintain a minimum?
 323          */
 324         switch (vht_cap->cap & IEEE80211_VHT_CAP_MAX_MPDU_MASK) {
 325         case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454:
 326                 link_sta->pub->agg.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_11454;
 327                 break;
 328         case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_7991:
 329                 link_sta->pub->agg.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_7991;
 330                 break;
 331         case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_3895:
 332         default:
 333                 link_sta->pub->agg.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_3895;
 334                 break;
 335         }
 336
 337         ieee80211_sta_recalc_aggregates(&link_sta->sta->sta);
 338 }
 339
 340 /* FIXME: move this to some better location - parses HE/EHT now */
 341 enum ieee80211_sta_rx_bandwidth
 342 ieee80211_sta_cap_rx_bw(struct link_sta_info *link_sta)
 343 {
 344         unsigned int link_id = link_sta->link_id;
 345         struct ieee80211_sub_if_data *sdata = link_sta->sta->sdata;
 346         struct ieee80211_sta_vht_cap *vht_cap = &link_sta->pub->vht_cap;
 347         struct ieee80211_sta_he_cap *he_cap = &link_sta->pub->he_cap;
 348         struct ieee80211_sta_eht_cap *eht_cap = &link_sta->pub->eht_cap;
 349         u32 cap_width;
 350
 351         if (he_cap->has_he) {
 352                 struct ieee80211_bss_conf *link_conf;
 353                 enum ieee80211_sta_rx_bandwidth ret;
 354                 u8 info;
 355
 356                 rcu_read_lock();
 357                 link_conf = rcu_dereference(sdata->vif.link_conf[link_id]);
 358
 359                 if (eht_cap->has_eht &&
 360                     link_conf->chandef.chan->band == NL80211_BAND_6GHZ) {
 361                         info = eht_cap->eht_cap_elem.phy_cap_info[0];
 362
 363                         if (info & IEEE80211_EHT_PHY_CAP0_320MHZ_IN_6GHZ) {
 364                                 ret = IEEE80211_STA_RX_BW_320;
 365                                 goto out;
 366                         }
 367                 }
 368
 369                 info = he_cap->he_cap_elem.phy_cap_info[0];
 370
 371                 if (link_conf->chandef.chan->band == NL80211_BAND_2GHZ) {
 372                         if (info & IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_40MHZ_IN_2G)
 373                                 ret = IEEE80211_STA_RX_BW_40;
 374                         else
 375                                 ret = IEEE80211_STA_RX_BW_20;
 376                         goto out;
 377                 }
 378
 379                 if (info & IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_160MHZ_IN_5G ||
 380                     info & IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_80PLUS80_MHZ_IN_5G)
 381                         ret = IEEE80211_STA_RX_BW_160;
 382                 else if (info & IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_40MHZ_80MHZ_IN_5G)
 383                         ret = IEEE80211_STA_RX_BW_80;
 384                 else
 385                         ret = IEEE80211_STA_RX_BW_20;
 386 out:
 387                 rcu_read_unlock();
 388
 389                 return ret;
 390         }
 391
 392         if (!vht_cap->vht_supported)
 393                 return link_sta->pub->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
 394                                 IEEE80211_STA_RX_BW_40 :
 395                                 IEEE80211_STA_RX_BW_20;
 396
 397         cap_width = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 398
 399         if (cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
 400             cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
 401                 return IEEE80211_STA_RX_BW_160;
 402
 403         /*
 404          * If this is non-zero, then it does support 160 MHz after all,
 405          * in one form or the other. We don't distinguish here (or even
 406          * above) between 160 and 80+80 yet.
 407          */
 408         if (vht_cap->cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK)
 409                 return IEEE80211_STA_RX_BW_160;
 410
 411         return IEEE80211_STA_RX_BW_80;
 412 }
 413
 414 enum nl80211_chan_width
 415 ieee80211_sta_cap_chan_bw(struct link_sta_info *link_sta)
 416 {
 417         struct ieee80211_sta_vht_cap *vht_cap = &link_sta->pub->vht_cap;
 418         u32 cap_width;
 419
 420         if (!vht_cap->vht_supported) {
 421                 if (!link_sta->pub->ht_cap.ht_supported)
 422                         return NL80211_CHAN_WIDTH_20_NOHT;
 423
 424                 return link_sta->pub->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
 425                                 NL80211_CHAN_WIDTH_40 : NL80211_CHAN_WIDTH_20;
 426         }
 427
 428         cap_width = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 429
 430         if (cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ)
 431                 return NL80211_CHAN_WIDTH_160;
 432         else if (cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
 433                 return NL80211_CHAN_WIDTH_80P80;
 434
 435         return NL80211_CHAN_WIDTH_80;
 436 }
 437
 438 enum nl80211_chan_width
 439 ieee80211_sta_rx_bw_to_chan_width(struct link_sta_info *link_sta)
 440 {
 441         enum ieee80211_sta_rx_bandwidth cur_bw =
 442                 link_sta->pub->bandwidth;
 443         struct ieee80211_sta_vht_cap *vht_cap =
 444                 &link_sta->pub->vht_cap;
 445         u32 cap_width;
 446
 447         switch (cur_bw) {
 448         case IEEE80211_STA_RX_BW_20:
 449                 if (!link_sta->pub->ht_cap.ht_supported)
 450                         return NL80211_CHAN_WIDTH_20_NOHT;
 451                 else
 452                         return NL80211_CHAN_WIDTH_20;
 453         case IEEE80211_STA_RX_BW_40:
 454                 return NL80211_CHAN_WIDTH_40;
 455         case IEEE80211_STA_RX_BW_80:
 456                 return NL80211_CHAN_WIDTH_80;
 457         case IEEE80211_STA_RX_BW_160:
 458                 cap_width =
 459                         vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 460
 461                 if (cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ)
 462                         return NL80211_CHAN_WIDTH_160;
 463
 464                 return NL80211_CHAN_WIDTH_80P80;
 465         default:
 466                 return NL80211_CHAN_WIDTH_20;
 467         }
 468 }
 469
 470 enum ieee80211_sta_rx_bandwidth
 471 ieee80211_chan_width_to_rx_bw(enum nl80211_chan_width width)
 472 {
 473         switch (width) {
 474         case NL80211_CHAN_WIDTH_20_NOHT:
 475         case NL80211_CHAN_WIDTH_20:
 476                 return IEEE80211_STA_RX_BW_20;
 477         case NL80211_CHAN_WIDTH_40:
 478                 return IEEE80211_STA_RX_BW_40;
 479         case NL80211_CHAN_WIDTH_80:
 480                 return IEEE80211_STA_RX_BW_80;
 481         case NL80211_CHAN_WIDTH_160:
 482         case NL80211_CHAN_WIDTH_80P80:
 483                 return IEEE80211_STA_RX_BW_160;
 484         case NL80211_CHAN_WIDTH_320:
 485                 return IEEE80211_STA_RX_BW_320;
 486         default:
 487                 WARN_ON_ONCE(1);
 488                 return IEEE80211_STA_RX_BW_20;
 489         }
 490 }
 491
 492 /* FIXME: rename/move - this deals with everything not just VHT */
 493 enum ieee80211_sta_rx_bandwidth
 494 ieee80211_sta_cur_vht_bw(struct link_sta_info *link_sta)
 495 {
 496         struct sta_info *sta = link_sta->sta;
 497         struct ieee80211_bss_conf *link_conf;
 498         enum nl80211_chan_width bss_width;
 499         enum ieee80211_sta_rx_bandwidth bw;
 500
 501         rcu_read_lock();
 502         link_conf = rcu_dereference(sta->sdata->vif.link_conf[link_sta->link_id]);
 503         if (WARN_ON(!link_conf))
 504                 bss_width = NL80211_CHAN_WIDTH_20_NOHT;
 505         else
 506                 bss_width = link_conf->chandef.width;
 507         rcu_read_unlock();
 508
 509         bw = ieee80211_sta_cap_rx_bw(link_sta);
 510         bw = min(bw, link_sta->cur_max_bandwidth);
 511
 512         /* Don't consider AP's bandwidth for TDLS peers, section 11.23.1 of
 513          * IEEE80211-2016 specification makes higher bandwidth operation
 514          * possible on the TDLS link if the peers have wider bandwidth
 515          * capability.
 516          *
 517          * However, in this case, and only if the TDLS peer is authorized,
 518          * limit to the tdls_chandef so that the configuration here isn't
 519          * wider than what's actually requested on the channel context.
 520          */
 521         if (test_sta_flag(sta, WLAN_STA_TDLS_PEER) &&
 522             test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW) &&
 523             test_sta_flag(sta, WLAN_STA_AUTHORIZED) &&
 524             sta->tdls_chandef.chan)
 525                 bw = min(bw, ieee80211_chan_width_to_rx_bw(sta->tdls_chandef.width));
 526         else
 527                 bw = min(bw, ieee80211_chan_width_to_rx_bw(bss_width));
 528
 529         return bw;
 530 }
 531
 532 void ieee80211_sta_set_rx_nss(struct link_sta_info *link_sta)
 533 {
 534         u8 ht_rx_nss = 0, vht_rx_nss = 0, he_rx_nss = 0, eht_rx_nss = 0, rx_nss;
 535         bool support_160;
 536
 537         /* if we received a notification already don't overwrite it */
 538         if (link_sta->pub->rx_nss)
 539                 return;
 540
 541         if (link_sta->pub->eht_cap.has_eht) {
 542                 int i;
 543                 const u8 *rx_nss_mcs = (void *)&link_sta->pub->eht_cap.eht_mcs_nss_supp;
 544
 545                 /* get the max nss for EHT over all possible bandwidths and mcs */
 546                 for (i = 0; i < sizeof(struct ieee80211_eht_mcs_nss_supp); i++)
 547                         eht_rx_nss = max_t(u8, eht_rx_nss,
 548                                            u8_get_bits(rx_nss_mcs[i],
 549                                                        IEEE80211_EHT_MCS_NSS_RX));
 550         }
 551
 552         if (link_sta->pub->he_cap.has_he) {
 553                 int i;
 554                 u8 rx_mcs_80 = 0, rx_mcs_160 = 0;
 555                 const struct ieee80211_sta_he_cap *he_cap = &link_sta->pub->he_cap;
 556                 u16 mcs_160_map =
 557                         le16_to_cpu(he_cap->he_mcs_nss_supp.rx_mcs_160);
 558                 u16 mcs_80_map = le16_to_cpu(he_cap->he_mcs_nss_supp.rx_mcs_80);
 559
 560                 for (i = 7; i >= 0; i--) {
 561                         u8 mcs_160 = (mcs_160_map >> (2 * i)) & 3;
 562
 563                         if (mcs_160 != IEEE80211_HE_MCS_NOT_SUPPORTED) {
 564                                 rx_mcs_160 = i + 1;
 565                                 break;
 566                         }
 567                 }
 568                 for (i = 7; i >= 0; i--) {
 569                         u8 mcs_80 = (mcs_80_map >> (2 * i)) & 3;
 570
 571                         if (mcs_80 != IEEE80211_HE_MCS_NOT_SUPPORTED) {
 572                                 rx_mcs_80 = i + 1;
 573                                 break;
 574                         }
 575                 }
 576
 577                 support_160 = he_cap->he_cap_elem.phy_cap_info[0] &
 578                               IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_160MHZ_IN_5G;
 579
 580                 if (support_160)
 581                         he_rx_nss = min(rx_mcs_80, rx_mcs_160);
 582                 else
 583                         he_rx_nss = rx_mcs_80;
 584         }
 585
 586         if (link_sta->pub->ht_cap.ht_supported) {
 587                 if (link_sta->pub->ht_cap.mcs.rx_mask[0])
 588                         ht_rx_nss++;
 589                 if (link_sta->pub->ht_cap.mcs.rx_mask[1])
 590                         ht_rx_nss++;
 591                 if (link_sta->pub->ht_cap.mcs.rx_mask[2])
 592                         ht_rx_nss++;
 593                 if (link_sta->pub->ht_cap.mcs.rx_mask[3])
 594                         ht_rx_nss++;
 595                 /* FIXME: consider rx_highest? */
 596         }
 597
 598         if (link_sta->pub->vht_cap.vht_supported) {
 599                 int i;
 600                 u16 rx_mcs_map;
 601
 602                 rx_mcs_map = le16_to_cpu(link_sta->pub->vht_cap.vht_mcs.rx_mcs_map);
 603
 604                 for (i = 7; i >= 0; i--) {
 605                         u8 mcs = (rx_mcs_map >> (2 * i)) & 3;
 606
 607                         if (mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED) {
 608                                 vht_rx_nss = i + 1;
 609                                 break;
 610                         }
 611                 }
 612                 /* FIXME: consider rx_highest? */
 613         }
 614
 615         rx_nss = max(vht_rx_nss, ht_rx_nss);
 616         rx_nss = max(he_rx_nss, rx_nss);
 617         rx_nss = max(eht_rx_nss, rx_nss);
 618         link_sta->pub->rx_nss = max_t(u8, 1, rx_nss);
 619 }
 620
 621 u32 __ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
 622                                   struct link_sta_info *link_sta,
 623                                   u8 opmode, enum nl80211_band band)
 624 {
 625         enum ieee80211_sta_rx_bandwidth new_bw;
 626         struct sta_opmode_info sta_opmode = {};
 627         u32 changed = 0;
 628         u8 nss, cur_nss;
 629
 630         /* ignore - no support for BF yet */
 631         if (opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)
 632                 return 0;
 633
 634         nss = opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
 635         nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
 636         nss += 1;
 637
 638         if (link_sta->pub->rx_nss != nss) {
 639                 cur_nss = link_sta->pub->rx_nss;
 640                 /* Reset rx_nss and call ieee80211_sta_set_rx_nss() which
 641                  * will set the same to max nss value calculated based on capability.
 642                  */
 643                 link_sta->pub->rx_nss = 0;
 644                 ieee80211_sta_set_rx_nss(link_sta);
 645                 /* Do not allow an nss change to rx_nss greater than max_nss
 646                  * negotiated and capped to APs capability during association.
 647                  */
 648                 if (nss <= link_sta->pub->rx_nss) {
 649                         link_sta->pub->rx_nss = nss;
 650                         sta_opmode.rx_nss = nss;
 651                         changed |= IEEE80211_RC_NSS_CHANGED;
 652                         sta_opmode.changed |= STA_OPMODE_N_SS_CHANGED;
 653                 } else {
 654                         link_sta->pub->rx_nss = cur_nss;
 655                         pr_warn_ratelimited("Ignoring NSS change in VHT Operating Mode Notification from %pM with invalid nss %d",
 656                                             link_sta->pub->addr, nss);
 657                 }
 658         }
 659
 660         switch (opmode & IEEE80211_OPMODE_NOTIF_CHANWIDTH_MASK) {
 661         case IEEE80211_OPMODE_NOTIF_CHANWIDTH_20MHZ:
 662                 /* ignore IEEE80211_OPMODE_NOTIF_BW_160_80P80 must not be set */
 663                 link_sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_20;
 664                 break;
 665         case IEEE80211_OPMODE_NOTIF_CHANWIDTH_40MHZ:
 666                 /* ignore IEEE80211_OPMODE_NOTIF_BW_160_80P80 must not be set */
 667                 link_sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_40;
 668                 break;
 669         case IEEE80211_OPMODE_NOTIF_CHANWIDTH_80MHZ:
 670                 if (opmode & IEEE80211_OPMODE_NOTIF_BW_160_80P80)
 671                         link_sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160;
 672                 else
 673                         link_sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80;
 674                 break;
 675         case IEEE80211_OPMODE_NOTIF_CHANWIDTH_160MHZ:
 676                 /* legacy only, no longer used by newer spec */
 677                 link_sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160;
 678                 break;
 679         }
 680
 681         new_bw = ieee80211_sta_cur_vht_bw(link_sta);
 682         if (new_bw != link_sta->pub->bandwidth) {
 683                 link_sta->pub->bandwidth = new_bw;
 684                 sta_opmode.bw = ieee80211_sta_rx_bw_to_chan_width(link_sta);
 685                 changed |= IEEE80211_RC_BW_CHANGED;
 686                 sta_opmode.changed |= STA_OPMODE_MAX_BW_CHANGED;
 687         }
 688
 689         if (sta_opmode.changed)
 690                 cfg80211_sta_opmode_change_notify(sdata->dev, link_sta->addr,
 691                                                   &sta_opmode, GFP_KERNEL);
 692
 693         return changed;
 694 }
 695
 696 void ieee80211_process_mu_groups(struct ieee80211_sub_if_data *sdata,
 697                                  struct ieee80211_link_data *link,
 698                                  struct ieee80211_mgmt *mgmt)
 699 {
 700         struct ieee80211_bss_conf *link_conf = link->conf;
 701
 702         if (!link_conf->mu_mimo_owner)
 703                 return;
 704
 705         if (!memcmp(mgmt->u.action.u.vht_group_notif.position,
 706                     link_conf->mu_group.position, WLAN_USER_POSITION_LEN) &&
 707             !memcmp(mgmt->u.action.u.vht_group_notif.membership,
 708                     link_conf->mu_group.membership, WLAN_MEMBERSHIP_LEN))
 709                 return;
 710
 711         memcpy(link_conf->mu_group.membership,
 712                mgmt->u.action.u.vht_group_notif.membership,
 713                WLAN_MEMBERSHIP_LEN);
 714         memcpy(link_conf->mu_group.position,
 715                mgmt->u.action.u.vht_group_notif.position,
 716                WLAN_USER_POSITION_LEN);
 717
 718         ieee80211_link_info_change_notify(sdata, link,
 719                                           BSS_CHANGED_MU_GROUPS);
 720 }
 721
 722 void ieee80211_update_mu_groups(struct ieee80211_vif *vif, unsigned int link_id,
 723                                 const u8 *membership, const u8 *position)
 724 {
 725         struct ieee80211_bss_conf *link_conf;
 726
 727         rcu_read_lock();
 728         link_conf = rcu_dereference(vif->link_conf[link_id]);
 729
 730         if (!WARN_ON_ONCE(!link_conf || !link_conf->mu_mimo_owner)) {
 731                 memcpy(link_conf->mu_group.membership, membership,
 732                        WLAN_MEMBERSHIP_LEN);
 733                 memcpy(link_conf->mu_group.position, position,
 734                        WLAN_USER_POSITION_LEN);
 735         }
 736         rcu_read_unlock();
 737 }
 738 EXPORT_SYMBOL_GPL(ieee80211_update_mu_groups);
 739
 740 void ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
 741                                  struct link_sta_info *link_sta,
 742                                  u8 opmode, enum nl80211_band band)
 743 {
 744         struct ieee80211_local *local = sdata->local;
 745         struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
 746
 747         u32 changed = __ieee80211_vht_handle_opmode(sdata, link_sta,
 748                                                     opmode, band);
 749
 750         if (changed > 0) {
 751                 ieee80211_recalc_min_chandef(sdata, link_sta->link_id);
 752                 rate_control_rate_update(local, sband, link_sta->sta,
 753                                          link_sta->link_id, changed);
 754         }
 755 }
 756
 757 void ieee80211_get_vht_mask_from_cap(__le16 vht_cap,
 758                                      u16 vht_mask[NL80211_VHT_NSS_MAX])
 759 {
 760         int i;
 761         u16 mask, cap = le16_to_cpu(vht_cap);
 762
 763         for (i = 0; i < NL80211_VHT_NSS_MAX; i++) {
 764                 mask = (cap >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
 765                 switch (mask) {
 766                 case IEEE80211_VHT_MCS_SUPPORT_0_7:
 767                         vht_mask[i] = 0x00FF;
 768                         break;
 769                 case IEEE80211_VHT_MCS_SUPPORT_0_8:
 770                         vht_mask[i] = 0x01FF;
 771                         break;
 772                 case IEEE80211_VHT_MCS_SUPPORT_0_9:
 773                         vht_mask[i] = 0x03FF;
 774                         break;
 775                 case IEEE80211_VHT_MCS_NOT_SUPPORTED:
 776                 default:
 777                         vht_mask[i] = 0;
 778                         break;
 779                 }
 780         }
 781 }