net/mac80211/vht.c

   1 /*
   2  * VHT handling
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 #include <linux/ieee80211.h>
  10 #include <linux/export.h>
  11 #include <net/mac80211.h>
  12 #include "ieee80211_i.h"
  13 #include "rate.h"
  14
  15
  16 static void __check_vhtcap_disable(struct ieee80211_sub_if_data *sdata,
  17                                    struct ieee80211_sta_vht_cap *vht_cap,
  18                                    u32 flag)
  19 {
  20         __le32 le_flag = cpu_to_le32(flag);
  21
  22         if (sdata->u.mgd.vht_capa_mask.vht_cap_info & le_flag &&
  23             !(sdata->u.mgd.vht_capa.vht_cap_info & le_flag))
  24                 vht_cap->cap &= ~flag;
  25 }
  26
  27 void ieee80211_apply_vhtcap_overrides(struct ieee80211_sub_if_data *sdata,
  28                                       struct ieee80211_sta_vht_cap *vht_cap)
  29 {
  30         int i;
  31         u16 rxmcs_mask, rxmcs_cap, rxmcs_n, txmcs_mask, txmcs_cap, txmcs_n;
  32
  33         if (!vht_cap->vht_supported)
  34                 return;
  35
  36         if (sdata->vif.type != NL80211_IFTYPE_STATION)
  37                 return;
  38
  39         __check_vhtcap_disable(sdata, vht_cap,
  40                                IEEE80211_VHT_CAP_RXLDPC);
  41         __check_vhtcap_disable(sdata, vht_cap,
  42                                IEEE80211_VHT_CAP_SHORT_GI_80);
  43         __check_vhtcap_disable(sdata, vht_cap,
  44                                IEEE80211_VHT_CAP_SHORT_GI_160);
  45         __check_vhtcap_disable(sdata, vht_cap,
  46                                IEEE80211_VHT_CAP_TXSTBC);
  47         __check_vhtcap_disable(sdata, vht_cap,
  48                                IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE);
  49         __check_vhtcap_disable(sdata, vht_cap,
  50                                IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE);
  51         __check_vhtcap_disable(sdata, vht_cap,
  52                                IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN);
  53         __check_vhtcap_disable(sdata, vht_cap,
  54                                IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN);
  55
  56         /* Allow user to decrease AMPDU length exponent */
  57         if (sdata->u.mgd.vht_capa_mask.vht_cap_info &
  58             cpu_to_le32(IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK)) {
  59                 u32 cap, n;
  60
  61                 n = le32_to_cpu(sdata->u.mgd.vht_capa.vht_cap_info) &
  62                         IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;
  63                 n >>= IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT;
  64                 cap = vht_cap->cap & IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;
  65                 cap >>= IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT;
  66
  67                 if (n < cap) {
  68                         vht_cap->cap &=
  69                                 ~IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;
  70                         vht_cap->cap |=
  71                                 n << IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT;
  72                 }
  73         }
  74
  75         /* Allow the user to decrease MCSes */
  76         rxmcs_mask =
  77                 le16_to_cpu(sdata->u.mgd.vht_capa_mask.supp_mcs.rx_mcs_map);
  78         rxmcs_n = le16_to_cpu(sdata->u.mgd.vht_capa.supp_mcs.rx_mcs_map);
  79         rxmcs_n &= rxmcs_mask;
  80         rxmcs_cap = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map);
  81
  82         txmcs_mask =
  83                 le16_to_cpu(sdata->u.mgd.vht_capa_mask.supp_mcs.tx_mcs_map);
  84         txmcs_n = le16_to_cpu(sdata->u.mgd.vht_capa.supp_mcs.tx_mcs_map);
  85         txmcs_n &= txmcs_mask;
  86         txmcs_cap = le16_to_cpu(vht_cap->vht_mcs.tx_mcs_map);
  87         for (i = 0; i < 8; i++) {
  88                 u8 m, n, c;
  89
  90                 m = (rxmcs_mask >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
  91                 n = (rxmcs_n >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
  92                 c = (rxmcs_cap >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
  93
  94                 if (m && ((c != IEEE80211_VHT_MCS_NOT_SUPPORTED && n < c) ||
  95                           n == IEEE80211_VHT_MCS_NOT_SUPPORTED)) {
  96                         rxmcs_cap &= ~(3 << 2*i);
  97                         rxmcs_cap |= (rxmcs_n & (3 << 2*i));
  98                 }
  99
 100                 m = (txmcs_mask >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
 101                 n = (txmcs_n >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
 102                 c = (txmcs_cap >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
 103
 104                 if (m && ((c != IEEE80211_VHT_MCS_NOT_SUPPORTED && n < c) ||
 105                           n == IEEE80211_VHT_MCS_NOT_SUPPORTED)) {
 106                         txmcs_cap &= ~(3 << 2*i);
 107                         txmcs_cap |= (txmcs_n & (3 << 2*i));
 108                 }
 109         }
 110         vht_cap->vht_mcs.rx_mcs_map = cpu_to_le16(rxmcs_cap);
 111         vht_cap->vht_mcs.tx_mcs_map = cpu_to_le16(txmcs_cap);
 112 }
 113
 114 void
 115 ieee80211_vht_cap_ie_to_sta_vht_cap(struct ieee80211_sub_if_data *sdata,
 116                                     struct ieee80211_supported_band *sband,
 117                                     const struct ieee80211_vht_cap *vht_cap_ie,
 118                                     struct sta_info *sta)
 119 {
 120         struct ieee80211_sta_vht_cap *vht_cap = &sta->sta.vht_cap;
 121         struct ieee80211_sta_vht_cap own_cap;
 122         u32 cap_info, i;
 123
 124         memset(vht_cap, 0, sizeof(*vht_cap));
 125
 126         if (!sta->sta.ht_cap.ht_supported)
 127                 return;
 128
 129         if (!vht_cap_ie || !sband->vht_cap.vht_supported)
 130                 return;
 131
 132         /* don't support VHT for TDLS peers for now */
 133         if (test_sta_flag(sta, WLAN_STA_TDLS_PEER))
 134                 return;
 135
 136         /*
 137          * A VHT STA must support 40 MHz, but if we verify that here
 138          * then we break a few things - some APs (e.g. Netgear R6300v2
 139          * and others based on the BCM4360 chipset) will unset this
 140          * capability bit when operating in 20 MHz.
 141          */
 142
 143         vht_cap->vht_supported = true;
 144
 145         own_cap = sband->vht_cap;
 146         /*
 147          * If user has specified capability overrides, take care
 148          * of that if the station we're setting up is the AP that
 149          * we advertised a restricted capability set to. Override
 150          * our own capabilities and then use those below.
 151          */
 152         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 153             !test_sta_flag(sta, WLAN_STA_TDLS_PEER))
 154                 ieee80211_apply_vhtcap_overrides(sdata, &own_cap);
 155
 156         /* take some capabilities as-is */
 157         cap_info = le32_to_cpu(vht_cap_ie->vht_cap_info);
 158         vht_cap->cap = cap_info;
 159         vht_cap->cap &= IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_3895 |
 160                         IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_7991 |
 161                         IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454 |
 162                         IEEE80211_VHT_CAP_RXLDPC |
 163                         IEEE80211_VHT_CAP_VHT_TXOP_PS |
 164                         IEEE80211_VHT_CAP_HTC_VHT |
 165                         IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK |
 166                         IEEE80211_VHT_CAP_VHT_LINK_ADAPTATION_VHT_UNSOL_MFB |
 167                         IEEE80211_VHT_CAP_VHT_LINK_ADAPTATION_VHT_MRQ_MFB |
 168                         IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN |
 169                         IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN;
 170
 171         /* and some based on our own capabilities */
 172         switch (own_cap.cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) {
 173         case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ:
 174                 vht_cap->cap |= cap_info &
 175                                 IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 176                 break;
 177         case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ:
 178                 vht_cap->cap |= cap_info &
 179                                 IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 180                 break;
 181         default:
 182                 /* nothing */
 183                 break;
 184         }
 185
 186         /* symmetric capabilities */
 187         vht_cap->cap |= cap_info & own_cap.cap &
 188                         (IEEE80211_VHT_CAP_SHORT_GI_80 |
 189                          IEEE80211_VHT_CAP_SHORT_GI_160);
 190
 191         /* remaining ones */
 192         if (own_cap.cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE)
 193                 vht_cap->cap |= cap_info &
 194                                 (IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE |
 195                                  IEEE80211_VHT_CAP_SOUNDING_DIMENSIONS_MASK);
 196
 197         if (own_cap.cap & IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)
 198                 vht_cap->cap |= cap_info &
 199                                 (IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
 200                                  IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK);
 201
 202         if (own_cap.cap & IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)
 203                 vht_cap->cap |= cap_info &
 204                                 IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
 205
 206         if (own_cap.cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE)
 207                 vht_cap->cap |= cap_info &
 208                                 IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE;
 209
 210         if (own_cap.cap & IEEE80211_VHT_CAP_TXSTBC)
 211                 vht_cap->cap |= cap_info & IEEE80211_VHT_CAP_RXSTBC_MASK;
 212
 213         if (own_cap.cap & IEEE80211_VHT_CAP_RXSTBC_MASK)
 214                 vht_cap->cap |= cap_info & IEEE80211_VHT_CAP_TXSTBC;
 215
 216         /* Copy peer MCS info, the driver might need them. */
 217         memcpy(&vht_cap->vht_mcs, &vht_cap_ie->supp_mcs,
 218                sizeof(struct ieee80211_vht_mcs_info));
 219
 220         /* but also restrict MCSes */
 221         for (i = 0; i < 8; i++) {
 222                 u16 own_rx, own_tx, peer_rx, peer_tx;
 223
 224                 own_rx = le16_to_cpu(own_cap.vht_mcs.rx_mcs_map);
 225                 own_rx = (own_rx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
 226
 227                 own_tx = le16_to_cpu(own_cap.vht_mcs.tx_mcs_map);
 228                 own_tx = (own_tx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
 229
 230                 peer_rx = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map);
 231                 peer_rx = (peer_rx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
 232
 233                 peer_tx = le16_to_cpu(vht_cap->vht_mcs.tx_mcs_map);
 234                 peer_tx = (peer_tx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
 235
 236                 if (peer_tx != IEEE80211_VHT_MCS_NOT_SUPPORTED) {
 237                         if (own_rx == IEEE80211_VHT_MCS_NOT_SUPPORTED)
 238                                 peer_tx = IEEE80211_VHT_MCS_NOT_SUPPORTED;
 239                         else if (own_rx < peer_tx)
 240                                 peer_tx = own_rx;
 241                 }
 242
 243                 if (peer_rx != IEEE80211_VHT_MCS_NOT_SUPPORTED) {
 244                         if (own_tx == IEEE80211_VHT_MCS_NOT_SUPPORTED)
 245                                 peer_rx = IEEE80211_VHT_MCS_NOT_SUPPORTED;
 246                         else if (own_tx < peer_rx)
 247                                 peer_rx = own_tx;
 248                 }
 249
 250                 vht_cap->vht_mcs.rx_mcs_map &=
 251                         ~cpu_to_le16(IEEE80211_VHT_MCS_NOT_SUPPORTED << i * 2);
 252                 vht_cap->vht_mcs.rx_mcs_map |= cpu_to_le16(peer_rx << i * 2);
 253
 254                 vht_cap->vht_mcs.tx_mcs_map &=
 255                         ~cpu_to_le16(IEEE80211_VHT_MCS_NOT_SUPPORTED << i * 2);
 256                 vht_cap->vht_mcs.tx_mcs_map |= cpu_to_le16(peer_tx << i * 2);
 257         }
 258
 259         /* finally set up the bandwidth */
 260         switch (vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) {
 261         case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ:
 262         case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ:
 263                 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160;
 264                 break;
 265         default:
 266                 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80;
 267         }
 268
 269         sta->sta.bandwidth = ieee80211_sta_cur_vht_bw(sta);
 270 }
 271
 272 enum ieee80211_sta_rx_bandwidth ieee80211_sta_cur_vht_bw(struct sta_info *sta)
 273 {
 274         struct ieee80211_sub_if_data *sdata = sta->sdata;
 275         u32 cap = sta->sta.vht_cap.cap;
 276         enum ieee80211_sta_rx_bandwidth bw;
 277
 278         if (!sta->sta.vht_cap.vht_supported) {
 279                 bw = sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
 280                                 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
 281                 goto check_max;
 282         }
 283
 284         switch (sdata->vif.bss_conf.chandef.width) {
 285         default:
 286                 WARN_ON_ONCE(1);
 287                 /* fall through */
 288         case NL80211_CHAN_WIDTH_20_NOHT:
 289         case NL80211_CHAN_WIDTH_20:
 290                 bw = IEEE80211_STA_RX_BW_20;
 291                 break;
 292         case NL80211_CHAN_WIDTH_40:
 293                 bw = sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
 294                                 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
 295                 break;
 296         case NL80211_CHAN_WIDTH_160:
 297                 if ((cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) ==
 298                                 IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ) {
 299                         bw = IEEE80211_STA_RX_BW_160;
 300                         break;
 301                 }
 302                 /* fall through */
 303         case NL80211_CHAN_WIDTH_80P80:
 304                 if ((cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) ==
 305                                 IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) {
 306                         bw = IEEE80211_STA_RX_BW_160;
 307                         break;
 308                 }
 309                 /* fall through */
 310         case NL80211_CHAN_WIDTH_80:
 311                 bw = IEEE80211_STA_RX_BW_80;
 312         }
 313
 314  check_max:
 315         if (bw > sta->cur_max_bandwidth)
 316                 bw = sta->cur_max_bandwidth;
 317         return bw;
 318 }
 319
 320 void ieee80211_sta_set_rx_nss(struct sta_info *sta)
 321 {
 322         u8 ht_rx_nss = 0, vht_rx_nss = 0;
 323
 324         /* if we received a notification already don't overwrite it */
 325         if (sta->sta.rx_nss)
 326                 return;
 327
 328         if (sta->sta.ht_cap.ht_supported) {
 329                 if (sta->sta.ht_cap.mcs.rx_mask[0])
 330                         ht_rx_nss++;
 331                 if (sta->sta.ht_cap.mcs.rx_mask[1])
 332                         ht_rx_nss++;
 333                 if (sta->sta.ht_cap.mcs.rx_mask[2])
 334                         ht_rx_nss++;
 335                 if (sta->sta.ht_cap.mcs.rx_mask[3])
 336                         ht_rx_nss++;
 337                 /* FIXME: consider rx_highest? */
 338         }
 339
 340         if (sta->sta.vht_cap.vht_supported) {
 341                 int i;
 342                 u16 rx_mcs_map;
 343
 344                 rx_mcs_map = le16_to_cpu(sta->sta.vht_cap.vht_mcs.rx_mcs_map);
 345
 346                 for (i = 7; i >= 0; i--) {
 347                         u8 mcs = (rx_mcs_map >> (2 * i)) & 3;
 348
 349                         if (mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED) {
 350                                 vht_rx_nss = i + 1;
 351                                 break;
 352                         }
 353                 }
 354                 /* FIXME: consider rx_highest? */
 355         }
 356
 357         ht_rx_nss = max(ht_rx_nss, vht_rx_nss);
 358         sta->sta.rx_nss = max_t(u8, 1, ht_rx_nss);
 359 }
 360
 361 u32 __ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
 362                                   struct sta_info *sta, u8 opmode,
 363                                   enum ieee80211_band band, bool nss_only)
 364 {
 365         struct ieee80211_local *local = sdata->local;
 366         struct ieee80211_supported_band *sband;
 367         enum ieee80211_sta_rx_bandwidth new_bw;
 368         u32 changed = 0;
 369         u8 nss;
 370
 371         sband = local->hw.wiphy->bands[band];
 372
 373         /* ignore - no support for BF yet */
 374         if (opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)
 375                 return 0;
 376
 377         nss = opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
 378         nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
 379         nss += 1;
 380
 381         if (sta->sta.rx_nss != nss) {
 382                 sta->sta.rx_nss = nss;
 383                 changed |= IEEE80211_RC_NSS_CHANGED;
 384         }
 385
 386         if (nss_only)
 387                 return changed;
 388
 389         switch (opmode & IEEE80211_OPMODE_NOTIF_CHANWIDTH_MASK) {
 390         case IEEE80211_OPMODE_NOTIF_CHANWIDTH_20MHZ:
 391                 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_20;
 392                 break;
 393         case IEEE80211_OPMODE_NOTIF_CHANWIDTH_40MHZ:
 394                 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_40;
 395                 break;
 396         case IEEE80211_OPMODE_NOTIF_CHANWIDTH_80MHZ:
 397                 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80;
 398                 break;
 399         case IEEE80211_OPMODE_NOTIF_CHANWIDTH_160MHZ:
 400                 sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160;
 401                 break;
 402         }
 403
 404         new_bw = ieee80211_sta_cur_vht_bw(sta);
 405         if (new_bw != sta->sta.bandwidth) {
 406                 sta->sta.bandwidth = new_bw;
 407                 changed |= IEEE80211_RC_BW_CHANGED;
 408         }
 409
 410         return changed;
 411 }
 412
 413 void ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
 414                                  struct sta_info *sta, u8 opmode,
 415                                  enum ieee80211_band band, bool nss_only)
 416 {
 417         struct ieee80211_local *local = sdata->local;
 418         struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
 419
 420         u32 changed = __ieee80211_vht_handle_opmode(sdata, sta, opmode,
 421                                                     band, nss_only);
 422
 423         if (changed > 0)
 424                 rate_control_rate_update(local, sband, sta, changed);
 425 }