drivers/net/wireless/iwlwifi/iwl-agn-rxon.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2011 Intel Corporation. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  * Contact Information:
  22  * Intel Linux Wireless <ilw@linux.intel.com>
  23  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24  *
  25  *****************************************************************************/
  26
  27 #include "iwl-dev.h"
  28 #include "iwl-agn.h"
  29 #include "iwl-sta.h"
  30 #include "iwl-core.h"
  31 #include "iwl-agn-calib.h"
  32 #include "iwl-helpers.h"
  33
  34 static int iwlagn_disable_bss(struct iwl_priv *priv,
  35                               struct iwl_rxon_context *ctx,
  36                               struct iwl_rxon_cmd *send)
  37 {
  38         __le32 old_filter = send->filter_flags;
  39         int ret;
  40
  41         send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
  42         ret = iwl_send_cmd_pdu(priv, ctx->rxon_cmd, sizeof(*send), send);
  43
  44         send->filter_flags = old_filter;
  45
  46         if (ret)
  47                 IWL_ERR(priv, "Error clearing ASSOC_MSK on BSS (%d)\n", ret);
  48
  49         return ret;
  50 }
  51
  52 static int iwlagn_disable_pan(struct iwl_priv *priv,
  53                               struct iwl_rxon_context *ctx,
  54                               struct iwl_rxon_cmd *send)
  55 {
  56         struct iwl_notification_wait disable_wait;
  57         __le32 old_filter = send->filter_flags;
  58         u8 old_dev_type = send->dev_type;
  59         int ret;
  60
  61         iwlagn_init_notification_wait(priv, &disable_wait,
  62                                       REPLY_WIPAN_DEACTIVATION_COMPLETE,
  63                                       NULL, NULL);
  64
  65         send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
  66         send->dev_type = RXON_DEV_TYPE_P2P;
  67         ret = iwl_send_cmd_pdu(priv, ctx->rxon_cmd, sizeof(*send), send);
  68
  69         send->filter_flags = old_filter;
  70         send->dev_type = old_dev_type;
  71
  72         if (ret) {
  73                 IWL_ERR(priv, "Error disabling PAN (%d)\n", ret);
  74                 iwlagn_remove_notification(priv, &disable_wait);
  75         } else {
  76                 ret = iwlagn_wait_notification(priv, &disable_wait, HZ);
  77                 if (ret)
  78                         IWL_ERR(priv, "Timed out waiting for PAN disable\n");
  79         }
  80
  81         return ret;
  82 }
  83
  84 static void iwlagn_update_qos(struct iwl_priv *priv,
  85                               struct iwl_rxon_context *ctx)
  86 {
  87         int ret;
  88
  89         if (!ctx->is_active)
  90                 return;
  91
  92         ctx->qos_data.def_qos_parm.qos_flags = 0;
  93
  94         if (ctx->qos_data.qos_active)
  95                 ctx->qos_data.def_qos_parm.qos_flags |=
  96                         QOS_PARAM_FLG_UPDATE_EDCA_MSK;
  97
  98         if (ctx->ht.enabled)
  99                 ctx->qos_data.def_qos_parm.qos_flags |= QOS_PARAM_FLG_TGN_MSK;
 100
 101         IWL_DEBUG_QOS(priv, "send QoS cmd with Qos active=%d FLAGS=0x%X\n",
 102                       ctx->qos_data.qos_active,
 103                       ctx->qos_data.def_qos_parm.qos_flags);
 104
 105         ret = iwl_send_cmd_pdu(priv, ctx->qos_cmd,
 106                                sizeof(struct iwl_qosparam_cmd),
 107                                &ctx->qos_data.def_qos_parm);
 108         if (ret)
 109                 IWL_ERR(priv, "Failed to update QoS\n");
 110 }
 111
 112 static int iwlagn_update_beacon(struct iwl_priv *priv,
 113                                 struct ieee80211_vif *vif)
 114 {
 115         lockdep_assert_held(&priv->mutex);
 116
 117         dev_kfree_skb(priv->beacon_skb);
 118         priv->beacon_skb = ieee80211_beacon_get(priv->hw, vif);
 119         if (!priv->beacon_skb)
 120                 return -ENOMEM;
 121         return iwlagn_send_beacon_cmd(priv);
 122 }
 123
 124 static int iwlagn_send_rxon_assoc(struct iwl_priv *priv,
 125                            struct iwl_rxon_context *ctx)
 126 {
 127         int ret = 0;
 128         struct iwl_rxon_assoc_cmd rxon_assoc;
 129         const struct iwl_rxon_cmd *rxon1 = &ctx->staging;
 130         const struct iwl_rxon_cmd *rxon2 = &ctx->active;
 131
 132         if ((rxon1->flags == rxon2->flags) &&
 133             (rxon1->filter_flags == rxon2->filter_flags) &&
 134             (rxon1->cck_basic_rates == rxon2->cck_basic_rates) &&
 135             (rxon1->ofdm_ht_single_stream_basic_rates ==
 136              rxon2->ofdm_ht_single_stream_basic_rates) &&
 137             (rxon1->ofdm_ht_dual_stream_basic_rates ==
 138              rxon2->ofdm_ht_dual_stream_basic_rates) &&
 139             (rxon1->ofdm_ht_triple_stream_basic_rates ==
 140              rxon2->ofdm_ht_triple_stream_basic_rates) &&
 141             (rxon1->acquisition_data == rxon2->acquisition_data) &&
 142             (rxon1->rx_chain == rxon2->rx_chain) &&
 143             (rxon1->ofdm_basic_rates == rxon2->ofdm_basic_rates)) {
 144                 IWL_DEBUG_INFO(priv, "Using current RXON_ASSOC.  Not resending.\n");
 145                 return 0;
 146         }
 147
 148         rxon_assoc.flags = ctx->staging.flags;
 149         rxon_assoc.filter_flags = ctx->staging.filter_flags;
 150         rxon_assoc.ofdm_basic_rates = ctx->staging.ofdm_basic_rates;
 151         rxon_assoc.cck_basic_rates = ctx->staging.cck_basic_rates;
 152         rxon_assoc.reserved1 = 0;
 153         rxon_assoc.reserved2 = 0;
 154         rxon_assoc.reserved3 = 0;
 155         rxon_assoc.ofdm_ht_single_stream_basic_rates =
 156             ctx->staging.ofdm_ht_single_stream_basic_rates;
 157         rxon_assoc.ofdm_ht_dual_stream_basic_rates =
 158             ctx->staging.ofdm_ht_dual_stream_basic_rates;
 159         rxon_assoc.rx_chain_select_flags = ctx->staging.rx_chain;
 160         rxon_assoc.ofdm_ht_triple_stream_basic_rates =
 161                  ctx->staging.ofdm_ht_triple_stream_basic_rates;
 162         rxon_assoc.acquisition_data = ctx->staging.acquisition_data;
 163
 164         ret = iwl_send_cmd_pdu_async(priv, ctx->rxon_assoc_cmd,
 165                                      sizeof(rxon_assoc), &rxon_assoc, NULL);
 166         if (ret)
 167                 return ret;
 168
 169         return ret;
 170 }
 171
 172 static int iwlagn_rxon_disconn(struct iwl_priv *priv,
 173                                struct iwl_rxon_context *ctx)
 174 {
 175         int ret;
 176         struct iwl_rxon_cmd *active = (void *)&ctx->active;
 177
 178         if (ctx->ctxid == IWL_RXON_CTX_BSS)
 179                 ret = iwlagn_disable_bss(priv, ctx, &ctx->staging);
 180         else
 181                 ret = iwlagn_disable_pan(priv, ctx, &ctx->staging);
 182         if (ret)
 183                 return ret;
 184
 185         /*
 186          * Un-assoc RXON clears the station table and WEP
 187          * keys, so we have to restore those afterwards.
 188          */
 189         iwl_clear_ucode_stations(priv, ctx);
 190         iwl_restore_stations(priv, ctx);
 191         ret = iwl_restore_default_wep_keys(priv, ctx);
 192         if (ret) {
 193                 IWL_ERR(priv, "Failed to restore WEP keys (%d)\n", ret);
 194                 return ret;
 195         }
 196
 197         memcpy(active, &ctx->staging, sizeof(*active));
 198         return 0;
 199 }
 200
 201 static int iwlagn_rxon_connect(struct iwl_priv *priv,
 202                                struct iwl_rxon_context *ctx)
 203 {
 204         int ret;
 205         struct iwl_rxon_cmd *active = (void *)&ctx->active;
 206
 207         /* RXON timing must be before associated RXON */
 208         ret = iwl_send_rxon_timing(priv, ctx);
 209         if (ret) {
 210                 IWL_ERR(priv, "Failed to send timing (%d)!\n", ret);
 211                 return ret;
 212         }
 213         /* QoS info may be cleared by previous un-assoc RXON */
 214         iwlagn_update_qos(priv, ctx);
 215
 216         /*
 217          * We'll run into this code path when beaconing is
 218          * enabled, but then we also need to send the beacon
 219          * to the device.
 220          */
 221         if (ctx->vif && (ctx->vif->type == NL80211_IFTYPE_AP)) {
 222                 ret = iwlagn_update_beacon(priv, ctx->vif);
 223                 if (ret) {
 224                         IWL_ERR(priv,
 225                                 "Error sending required beacon (%d)!\n",
 226                                 ret);
 227                         return ret;
 228                 }
 229         }
 230
 231         priv->start_calib = 0;
 232         /*
 233          * Apply the new configuration.
 234          *
 235          * Associated RXON doesn't clear the station table in uCode,
 236          * so we don't need to restore stations etc. after this.
 237          */
 238         ret = iwl_send_cmd_pdu(priv, ctx->rxon_cmd,
 239                       sizeof(struct iwl_rxon_cmd), &ctx->staging);
 240         if (ret) {
 241                 IWL_ERR(priv, "Error setting new RXON (%d)\n", ret);
 242                 return ret;
 243         }
 244         memcpy(active, &ctx->staging, sizeof(*active));
 245
 246         iwl_reprogram_ap_sta(priv, ctx);
 247
 248         /* IBSS beacon needs to be sent after setting assoc */
 249         if (ctx->vif && (ctx->vif->type == NL80211_IFTYPE_ADHOC))
 250                 if (iwlagn_update_beacon(priv, ctx->vif))
 251                         IWL_ERR(priv, "Error sending IBSS beacon\n");
 252         iwl_init_sensitivity(priv);
 253
 254         /*
 255          * If we issue a new RXON command which required a tune then
 256          * we must send a new TXPOWER command or we won't be able to
 257          * Tx any frames.
 258          *
 259          * It's expected we set power here if channel is changing.
 260          */
 261         ret = iwl_set_tx_power(priv, priv->tx_power_next, true);
 262         if (ret) {
 263                 IWL_ERR(priv, "Error sending TX power (%d)\n", ret);
 264                 return ret;
 265         }
 266         return 0;
 267 }
 268
 269 /**
 270  * iwlagn_commit_rxon - commit staging_rxon to hardware
 271  *
 272  * The RXON command in staging_rxon is committed to the hardware and
 273  * the active_rxon structure is updated with the new data.  This
 274  * function correctly transitions out of the RXON_ASSOC_MSK state if
 275  * a HW tune is required based on the RXON structure changes.
 276  *
 277  * The connect/disconnect flow should be as the following:
 278  *
 279  * 1. make sure send RXON command with association bit unset if not connect
 280  *      this should include the channel and the band for the candidate
 281  *      to be connected to
 282  * 2. Add Station before RXON association with the AP
 283  * 3. RXON_timing has to send before RXON for connection
 284  * 4. full RXON command - associated bit set
 285  * 5. use RXON_ASSOC command to update any flags changes
 286  */
 287 int iwlagn_commit_rxon(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 288 {
 289         /* cast away the const for active_rxon in this function */
 290         struct iwl_rxon_cmd *active = (void *)&ctx->active;
 291         bool new_assoc = !!(ctx->staging.filter_flags & RXON_FILTER_ASSOC_MSK);
 292         int ret;
 293
 294         lockdep_assert_held(&priv->mutex);
 295
 296         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 297                 return -EINVAL;
 298
 299         if (!iwl_is_alive(priv))
 300                 return -EBUSY;
 301
 302         /* This function hardcodes a bunch of dual-mode assumptions */
 303         BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
 304
 305         if (!ctx->is_active)
 306                 return 0;
 307
 308         /* always get timestamp with Rx frame */
 309         ctx->staging.flags |= RXON_FLG_TSF2HOST_MSK;
 310
 311         if (ctx->ctxid == IWL_RXON_CTX_PAN && priv->_agn.hw_roc_channel) {
 312                 struct ieee80211_channel *chan = priv->_agn.hw_roc_channel;
 313
 314                 iwl_set_rxon_channel(priv, chan, ctx);
 315                 iwl_set_flags_for_band(priv, ctx, chan->band, NULL);
 316                 ctx->staging.filter_flags |=
 317                         RXON_FILTER_ASSOC_MSK |
 318                         RXON_FILTER_PROMISC_MSK |
 319                         RXON_FILTER_CTL2HOST_MSK;
 320                 ctx->staging.dev_type = RXON_DEV_TYPE_P2P;
 321                 new_assoc = true;
 322
 323                 if (memcmp(&ctx->staging, &ctx->active,
 324                            sizeof(ctx->staging)) == 0)
 325                         return 0;
 326         }
 327
 328         if ((ctx->vif && ctx->vif->bss_conf.use_short_slot) ||
 329             !(ctx->staging.flags & RXON_FLG_BAND_24G_MSK))
 330                 ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
 331         else
 332                 ctx->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;
 333
 334         iwl_print_rx_config_cmd(priv, ctx);
 335         ret = iwl_check_rxon_cmd(priv, ctx);
 336         if (ret) {
 337                 IWL_ERR(priv, "Invalid RXON configuration. Not committing.\n");
 338                 return -EINVAL;
 339         }
 340
 341         /*
 342          * receive commit_rxon request
 343          * abort any previous channel switch if still in process
 344          */
 345         if (priv->switch_rxon.switch_in_progress &&
 346             (priv->switch_rxon.channel != ctx->staging.channel)) {
 347                 IWL_DEBUG_11H(priv, "abort channel switch on %d\n",
 348                       le16_to_cpu(priv->switch_rxon.channel));
 349                 iwl_chswitch_done(priv, false);
 350         }
 351
 352         /*
 353          * If we don't need to send a full RXON, we can use
 354          * iwl_rxon_assoc_cmd which is used to reconfigure filter
 355          * and other flags for the current radio configuration.
 356          */
 357         if (!iwl_full_rxon_required(priv, ctx)) {
 358                 ret = iwlagn_send_rxon_assoc(priv, ctx);
 359                 if (ret) {
 360                         IWL_ERR(priv, "Error setting RXON_ASSOC (%d)\n", ret);
 361                         return ret;
 362                 }
 363
 364                 memcpy(active, &ctx->staging, sizeof(*active));
 365                 return 0;
 366         }
 367
 368         if (priv->cfg->ops->hcmd->set_pan_params) {
 369                 ret = priv->cfg->ops->hcmd->set_pan_params(priv);
 370                 if (ret)
 371                         return ret;
 372         }
 373
 374         iwl_set_rxon_hwcrypto(priv, ctx, !iwlagn_mod_params.sw_crypto);
 375
 376         IWL_DEBUG_INFO(priv,
 377                        "Going to commit RXON\n"
 378                        "  * with%s RXON_FILTER_ASSOC_MSK\n"
 379                        "  * channel = %d\n"
 380                        "  * bssid = %pM\n",
 381                        (new_assoc ? "" : "out"),
 382                        le16_to_cpu(ctx->staging.channel),
 383                        ctx->staging.bssid_addr);
 384
 385         /*
 386          * Always clear associated first, but with the correct config.
 387          * This is required as for example station addition for the
 388          * AP station must be done after the BSSID is set to correctly
 389          * set up filters in the device.
 390          */
 391         ret = iwlagn_rxon_disconn(priv, ctx);
 392         if (ret)
 393                 return ret;
 394
 395         if (new_assoc)
 396                 return iwlagn_rxon_connect(priv, ctx);
 397
 398         return 0;
 399 }
 400
 401 int iwlagn_mac_config(struct ieee80211_hw *hw, u32 changed)
 402 {
 403         struct iwl_priv *priv = hw->priv;
 404         struct iwl_rxon_context *ctx;
 405         struct ieee80211_conf *conf = &hw->conf;
 406         struct ieee80211_channel *channel = conf->channel;
 407         const struct iwl_channel_info *ch_info;
 408         int ret = 0;
 409
 410         IWL_DEBUG_MAC80211(priv, "changed %#x", changed);
 411
 412         mutex_lock(&priv->mutex);
 413
 414         if (unlikely(test_bit(STATUS_SCANNING, &priv->status))) {
 415                 IWL_DEBUG_MAC80211(priv, "leave - scanning\n");
 416                 goto out;
 417         }
 418
 419         if (!iwl_is_ready(priv)) {
 420                 IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
 421                 goto out;
 422         }
 423
 424         if (changed & (IEEE80211_CONF_CHANGE_SMPS |
 425                        IEEE80211_CONF_CHANGE_CHANNEL)) {
 426                 /* mac80211 uses static for non-HT which is what we want */
 427                 priv->current_ht_config.smps = conf->smps_mode;
 428
 429                 /*
 430                  * Recalculate chain counts.
 431                  *
 432                  * If monitor mode is enabled then mac80211 will
 433                  * set up the SM PS mode to OFF if an HT channel is
 434                  * configured.
 435                  */
 436                 if (priv->cfg->ops->hcmd->set_rxon_chain)
 437                         for_each_context(priv, ctx)
 438                                 priv->cfg->ops->hcmd->set_rxon_chain(priv, ctx);
 439         }
 440
 441         if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
 442                 unsigned long flags;
 443
 444                 ch_info = iwl_get_channel_info(priv, channel->band,
 445                                                channel->hw_value);
 446                 if (!is_channel_valid(ch_info)) {
 447                         IWL_DEBUG_MAC80211(priv, "leave - invalid channel\n");
 448                         ret = -EINVAL;
 449                         goto out;
 450                 }
 451
 452                 spin_lock_irqsave(&priv->lock, flags);
 453
 454                 for_each_context(priv, ctx) {
 455                         /* Configure HT40 channels */
 456                         if (ctx->ht.enabled != conf_is_ht(conf))
 457                                 ctx->ht.enabled = conf_is_ht(conf);
 458
 459                         if (ctx->ht.enabled) {
 460                                 if (conf_is_ht40_minus(conf)) {
 461                                         ctx->ht.extension_chan_offset =
 462                                                 IEEE80211_HT_PARAM_CHA_SEC_BELOW;
 463                                         ctx->ht.is_40mhz = true;
 464                                 } else if (conf_is_ht40_plus(conf)) {
 465                                         ctx->ht.extension_chan_offset =
 466                                                 IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
 467                                         ctx->ht.is_40mhz = true;
 468                                 } else {
 469                                         ctx->ht.extension_chan_offset =
 470                                                 IEEE80211_HT_PARAM_CHA_SEC_NONE;
 471                                         ctx->ht.is_40mhz = false;
 472                                 }
 473                         } else
 474                                 ctx->ht.is_40mhz = false;
 475
 476                         /*
 477                          * Default to no protection. Protection mode will
 478                          * later be set from BSS config in iwl_ht_conf
 479                          */
 480                         ctx->ht.protection = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
 481
 482                         /* if we are switching from ht to 2.4 clear flags
 483                          * from any ht related info since 2.4 does not
 484                          * support ht */
 485                         if (le16_to_cpu(ctx->staging.channel) !=
 486                             channel->hw_value)
 487                                 ctx->staging.flags = 0;
 488
 489                         iwl_set_rxon_channel(priv, channel, ctx);
 490                         iwl_set_rxon_ht(priv, &priv->current_ht_config);
 491
 492                         iwl_set_flags_for_band(priv, ctx, channel->band,
 493                                                ctx->vif);
 494                 }
 495
 496                 spin_unlock_irqrestore(&priv->lock, flags);
 497
 498                 iwl_update_bcast_stations(priv);
 499
 500                 /*
 501                  * The list of supported rates and rate mask can be different
 502                  * for each band; since the band may have changed, reset
 503                  * the rate mask to what mac80211 lists.
 504                  */
 505                 iwl_set_rate(priv);
 506         }
 507
 508         if (changed & (IEEE80211_CONF_CHANGE_PS |
 509                         IEEE80211_CONF_CHANGE_IDLE)) {
 510                 ret = iwl_power_update_mode(priv, false);
 511                 if (ret)
 512                         IWL_DEBUG_MAC80211(priv, "Error setting sleep level\n");
 513         }
 514
 515         if (changed & IEEE80211_CONF_CHANGE_POWER) {
 516                 IWL_DEBUG_MAC80211(priv, "TX Power old=%d new=%d\n",
 517                         priv->tx_power_user_lmt, conf->power_level);
 518
 519                 iwl_set_tx_power(priv, conf->power_level, false);
 520         }
 521
 522         for_each_context(priv, ctx) {
 523                 if (!memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
 524                         continue;
 525                 iwlagn_commit_rxon(priv, ctx);
 526         }
 527  out:
 528         mutex_unlock(&priv->mutex);
 529         return ret;
 530 }
 531
 532 static void iwlagn_check_needed_chains(struct iwl_priv *priv,
 533                                        struct iwl_rxon_context *ctx,
 534                                        struct ieee80211_bss_conf *bss_conf)
 535 {
 536         struct ieee80211_vif *vif = ctx->vif;
 537         struct iwl_rxon_context *tmp;
 538         struct ieee80211_sta *sta;
 539         struct iwl_ht_config *ht_conf = &priv->current_ht_config;
 540         struct ieee80211_sta_ht_cap *ht_cap;
 541         bool need_multiple;
 542
 543         lockdep_assert_held(&priv->mutex);
 544
 545         switch (vif->type) {
 546         case NL80211_IFTYPE_STATION:
 547                 rcu_read_lock();
 548                 sta = ieee80211_find_sta(vif, bss_conf->bssid);
 549                 if (!sta) {
 550                         /*
 551                          * If at all, this can only happen through a race
 552                          * when the AP disconnects us while we're still
 553                          * setting up the connection, in that case mac80211
 554                          * will soon tell us about that.
 555                          */
 556                         need_multiple = false;
 557                         rcu_read_unlock();
 558                         break;
 559                 }
 560
 561                 ht_cap = &sta->ht_cap;
 562
 563                 need_multiple = true;
 564
 565                 /*
 566                  * If the peer advertises no support for receiving 2 and 3
 567                  * stream MCS rates, it can't be transmitting them either.
 568                  */
 569                 if (ht_cap->mcs.rx_mask[1] == 0 &&
 570                     ht_cap->mcs.rx_mask[2] == 0) {
 571                         need_multiple = false;
 572                 } else if (!(ht_cap->mcs.tx_params &
 573                                                 IEEE80211_HT_MCS_TX_DEFINED)) {
 574                         /* If it can't TX MCS at all ... */
 575                         need_multiple = false;
 576                 } else if (ht_cap->mcs.tx_params &
 577                                                 IEEE80211_HT_MCS_TX_RX_DIFF) {
 578                         int maxstreams;
 579
 580                         /*
 581                          * But if it can receive them, it might still not
 582                          * be able to transmit them, which is what we need
 583                          * to check here -- so check the number of streams
 584                          * it advertises for TX (if different from RX).
 585                          */
 586
 587                         maxstreams = (ht_cap->mcs.tx_params &
 588                                  IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK);
 589                         maxstreams >>=
 590                                 IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT;
 591                         maxstreams += 1;
 592
 593                         if (maxstreams <= 1)
 594                                 need_multiple = false;
 595                 }
 596
 597                 rcu_read_unlock();
 598                 break;
 599         case NL80211_IFTYPE_ADHOC:
 600                 /* currently */
 601                 need_multiple = false;
 602                 break;
 603         default:
 604                 /* only AP really */
 605                 need_multiple = true;
 606                 break;
 607         }
 608
 609         ctx->ht_need_multiple_chains = need_multiple;
 610
 611         if (!need_multiple) {
 612                 /* check all contexts */
 613                 for_each_context(priv, tmp) {
 614                         if (!tmp->vif)
 615                                 continue;
 616                         if (tmp->ht_need_multiple_chains) {
 617                                 need_multiple = true;
 618                                 break;
 619                         }
 620                 }
 621         }
 622
 623         ht_conf->single_chain_sufficient = !need_multiple;
 624 }
 625
 626 void iwlagn_bss_info_changed(struct ieee80211_hw *hw,
 627                              struct ieee80211_vif *vif,
 628                              struct ieee80211_bss_conf *bss_conf,
 629                              u32 changes)
 630 {
 631         struct iwl_priv *priv = hw->priv;
 632         struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
 633         int ret;
 634         bool force = false;
 635
 636         mutex_lock(&priv->mutex);
 637
 638         if (unlikely(!iwl_is_ready(priv))) {
 639                 IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
 640                 mutex_unlock(&priv->mutex);
 641                 return;
 642         }
 643
 644         if (unlikely(!ctx->vif)) {
 645                 IWL_DEBUG_MAC80211(priv, "leave - vif is NULL\n");
 646                 mutex_unlock(&priv->mutex);
 647                 return;
 648         }
 649
 650         if (changes & BSS_CHANGED_BEACON_INT)
 651                 force = true;
 652
 653         if (changes & BSS_CHANGED_QOS) {
 654                 ctx->qos_data.qos_active = bss_conf->qos;
 655                 iwlagn_update_qos(priv, ctx);
 656         }
 657
 658         ctx->staging.assoc_id = cpu_to_le16(vif->bss_conf.aid);
 659         if (vif->bss_conf.use_short_preamble)
 660                 ctx->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
 661         else
 662                 ctx->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
 663
 664         if (changes & BSS_CHANGED_ASSOC) {
 665                 if (bss_conf->assoc) {
 666                         priv->timestamp = bss_conf->timestamp;
 667                         ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
 668                 } else {
 669                         /*
 670                          * If we disassociate while there are pending
 671                          * frames, just wake up the queues and let the
 672                          * frames "escape" ... This shouldn't really
 673                          * be happening to start with, but we should
 674                          * not get stuck in this case either since it
 675                          * can happen if userspace gets confused.
 676                          */
 677                         if (ctx->last_tx_rejected) {
 678                                 ctx->last_tx_rejected = false;
 679                                 iwl_wake_any_queue(priv, ctx);
 680                         }
 681                         ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
 682                 }
 683         }
 684
 685         if (ctx->ht.enabled) {
 686                 ctx->ht.protection = bss_conf->ht_operation_mode &
 687                                         IEEE80211_HT_OP_MODE_PROTECTION;
 688                 ctx->ht.non_gf_sta_present = !!(bss_conf->ht_operation_mode &
 689                                         IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT);
 690                 iwlagn_check_needed_chains(priv, ctx, bss_conf);
 691                 iwl_set_rxon_ht(priv, &priv->current_ht_config);
 692         }
 693
 694         if (priv->cfg->ops->hcmd->set_rxon_chain)
 695                 priv->cfg->ops->hcmd->set_rxon_chain(priv, ctx);
 696
 697         if (bss_conf->use_cts_prot && (priv->band != IEEE80211_BAND_5GHZ))
 698                 ctx->staging.flags |= RXON_FLG_TGG_PROTECT_MSK;
 699         else
 700                 ctx->staging.flags &= ~RXON_FLG_TGG_PROTECT_MSK;
 701
 702         if (bss_conf->use_cts_prot)
 703                 ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
 704         else
 705                 ctx->staging.flags &= ~RXON_FLG_SELF_CTS_EN;
 706
 707         memcpy(ctx->staging.bssid_addr, bss_conf->bssid, ETH_ALEN);
 708
 709         if (vif->type == NL80211_IFTYPE_AP ||
 710             vif->type == NL80211_IFTYPE_ADHOC) {
 711                 if (vif->bss_conf.enable_beacon) {
 712                         ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
 713                         priv->beacon_ctx = ctx;
 714                 } else {
 715                         ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
 716                         priv->beacon_ctx = NULL;
 717                 }
 718         }
 719
 720         if (force || memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
 721                 iwlagn_commit_rxon(priv, ctx);
 722
 723         if (changes & BSS_CHANGED_ASSOC && bss_conf->assoc) {
 724                 /*
 725                  * The chain noise calibration will enable PM upon
 726                  * completion. If calibration has already been run
 727                  * then we need to enable power management here.
 728                  */
 729                 if (priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE)
 730                         iwl_power_update_mode(priv, false);
 731
 732                 /* Enable RX differential gain and sensitivity calibrations */
 733                 iwl_chain_noise_reset(priv);
 734                 priv->start_calib = 1;
 735         }
 736
 737         if (changes & BSS_CHANGED_IBSS) {
 738                 ret = iwlagn_manage_ibss_station(priv, vif,
 739                                                  bss_conf->ibss_joined);
 740                 if (ret)
 741                         IWL_ERR(priv, "failed to %s IBSS station %pM\n",
 742                                 bss_conf->ibss_joined ? "add" : "remove",
 743                                 bss_conf->bssid);
 744         }
 745
 746         if (changes & BSS_CHANGED_BEACON && vif->type == NL80211_IFTYPE_ADHOC &&
 747             priv->beacon_ctx) {
 748                 if (iwlagn_update_beacon(priv, vif))
 749                         IWL_ERR(priv, "Error sending IBSS beacon\n");
 750         }
 751
 752         mutex_unlock(&priv->mutex);
 753 }
 754
 755 void iwlagn_post_scan(struct iwl_priv *priv)
 756 {
 757         struct iwl_rxon_context *ctx;
 758
 759         /*
 760          * Since setting the RXON may have been deferred while
 761          * performing the scan, fire one off if needed
 762          */
 763         for_each_context(priv, ctx)
 764                 if (memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
 765                         iwlagn_commit_rxon(priv, ctx);
 766
 767         if (priv->cfg->ops->hcmd->set_pan_params)
 768                 priv->cfg->ops->hcmd->set_pan_params(priv);
 769 }