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 #include "iwl-trans.h"
  34
  35 static int iwlagn_disable_bss(struct iwl_priv *priv,
  36                               struct iwl_rxon_context *ctx,
  37                               struct iwl_rxon_cmd *send)
  38 {
  39         __le32 old_filter = send->filter_flags;
  40         int ret;
  41
  42         send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
  43         ret = trans_send_cmd_pdu(priv, ctx->rxon_cmd,
  44                                 CMD_SYNC, sizeof(*send), send);
  45
  46         send->filter_flags = old_filter;
  47
  48         if (ret)
  49                 IWL_ERR(priv, "Error clearing ASSOC_MSK on BSS (%d)\n", ret);
  50
  51         return ret;
  52 }
  53
  54 static int iwlagn_disable_pan(struct iwl_priv *priv,
  55                               struct iwl_rxon_context *ctx,
  56                               struct iwl_rxon_cmd *send)
  57 {
  58         struct iwl_notification_wait disable_wait;
  59         __le32 old_filter = send->filter_flags;
  60         u8 old_dev_type = send->dev_type;
  61         int ret;
  62
  63         iwlagn_init_notification_wait(priv, &disable_wait,
  64                                       REPLY_WIPAN_DEACTIVATION_COMPLETE,
  65                                       NULL, NULL);
  66
  67         send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
  68         send->dev_type = RXON_DEV_TYPE_P2P;
  69         ret = trans_send_cmd_pdu(priv, ctx->rxon_cmd,
  70                                 CMD_SYNC, sizeof(*send), send);
  71
  72         send->filter_flags = old_filter;
  73         send->dev_type = old_dev_type;
  74
  75         if (ret) {
  76                 IWL_ERR(priv, "Error disabling PAN (%d)\n", ret);
  77                 iwlagn_remove_notification(priv, &disable_wait);
  78         } else {
  79                 ret = iwlagn_wait_notification(priv, &disable_wait, HZ);
  80                 if (ret)
  81                         IWL_ERR(priv, "Timed out waiting for PAN disable\n");
  82         }
  83
  84         return ret;
  85 }
  86
  87 static int iwlagn_disconn_pan(struct iwl_priv *priv,
  88                               struct iwl_rxon_context *ctx,
  89                               struct iwl_rxon_cmd *send)
  90 {
  91         __le32 old_filter = send->filter_flags;
  92         int ret;
  93
  94         send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
  95         ret = trans_send_cmd_pdu(priv, ctx->rxon_cmd, CMD_SYNC,
  96                                 sizeof(*send), send);
  97
  98         send->filter_flags = old_filter;
  99
 100         return ret;
 101 }
 102
 103 static void iwlagn_update_qos(struct iwl_priv *priv,
 104                               struct iwl_rxon_context *ctx)
 105 {
 106         int ret;
 107
 108         if (!ctx->is_active)
 109                 return;
 110
 111         ctx->qos_data.def_qos_parm.qos_flags = 0;
 112
 113         if (ctx->qos_data.qos_active)
 114                 ctx->qos_data.def_qos_parm.qos_flags |=
 115                         QOS_PARAM_FLG_UPDATE_EDCA_MSK;
 116
 117         if (ctx->ht.enabled)
 118                 ctx->qos_data.def_qos_parm.qos_flags |= QOS_PARAM_FLG_TGN_MSK;
 119
 120         IWL_DEBUG_QOS(priv, "send QoS cmd with Qos active=%d FLAGS=0x%X\n",
 121                       ctx->qos_data.qos_active,
 122                       ctx->qos_data.def_qos_parm.qos_flags);
 123
 124         ret = trans_send_cmd_pdu(priv, ctx->qos_cmd, CMD_SYNC,
 125                                sizeof(struct iwl_qosparam_cmd),
 126                                &ctx->qos_data.def_qos_parm);
 127         if (ret)
 128                 IWL_ERR(priv, "Failed to update QoS\n");
 129 }
 130
 131 static int iwlagn_update_beacon(struct iwl_priv *priv,
 132                                 struct ieee80211_vif *vif)
 133 {
 134         lockdep_assert_held(&priv->mutex);
 135
 136         dev_kfree_skb(priv->beacon_skb);
 137         priv->beacon_skb = ieee80211_beacon_get(priv->hw, vif);
 138         if (!priv->beacon_skb)
 139                 return -ENOMEM;
 140         return iwlagn_send_beacon_cmd(priv);
 141 }
 142
 143 static int iwlagn_send_rxon_assoc(struct iwl_priv *priv,
 144                            struct iwl_rxon_context *ctx)
 145 {
 146         int ret = 0;
 147         struct iwl_rxon_assoc_cmd rxon_assoc;
 148         const struct iwl_rxon_cmd *rxon1 = &ctx->staging;
 149         const struct iwl_rxon_cmd *rxon2 = &ctx->active;
 150
 151         if ((rxon1->flags == rxon2->flags) &&
 152             (rxon1->filter_flags == rxon2->filter_flags) &&
 153             (rxon1->cck_basic_rates == rxon2->cck_basic_rates) &&
 154             (rxon1->ofdm_ht_single_stream_basic_rates ==
 155              rxon2->ofdm_ht_single_stream_basic_rates) &&
 156             (rxon1->ofdm_ht_dual_stream_basic_rates ==
 157              rxon2->ofdm_ht_dual_stream_basic_rates) &&
 158             (rxon1->ofdm_ht_triple_stream_basic_rates ==
 159              rxon2->ofdm_ht_triple_stream_basic_rates) &&
 160             (rxon1->acquisition_data == rxon2->acquisition_data) &&
 161             (rxon1->rx_chain == rxon2->rx_chain) &&
 162             (rxon1->ofdm_basic_rates == rxon2->ofdm_basic_rates)) {
 163                 IWL_DEBUG_INFO(priv, "Using current RXON_ASSOC.  Not resending.\n");
 164                 return 0;
 165         }
 166
 167         rxon_assoc.flags = ctx->staging.flags;
 168         rxon_assoc.filter_flags = ctx->staging.filter_flags;
 169         rxon_assoc.ofdm_basic_rates = ctx->staging.ofdm_basic_rates;
 170         rxon_assoc.cck_basic_rates = ctx->staging.cck_basic_rates;
 171         rxon_assoc.reserved1 = 0;
 172         rxon_assoc.reserved2 = 0;
 173         rxon_assoc.reserved3 = 0;
 174         rxon_assoc.ofdm_ht_single_stream_basic_rates =
 175             ctx->staging.ofdm_ht_single_stream_basic_rates;
 176         rxon_assoc.ofdm_ht_dual_stream_basic_rates =
 177             ctx->staging.ofdm_ht_dual_stream_basic_rates;
 178         rxon_assoc.rx_chain_select_flags = ctx->staging.rx_chain;
 179         rxon_assoc.ofdm_ht_triple_stream_basic_rates =
 180                  ctx->staging.ofdm_ht_triple_stream_basic_rates;
 181         rxon_assoc.acquisition_data = ctx->staging.acquisition_data;
 182
 183         ret = trans_send_cmd_pdu(priv, ctx->rxon_assoc_cmd,
 184                                 CMD_ASYNC, sizeof(rxon_assoc), &rxon_assoc);
 185         return ret;
 186 }
 187
 188 static int iwlagn_rxon_disconn(struct iwl_priv *priv,
 189                                struct iwl_rxon_context *ctx)
 190 {
 191         int ret;
 192         struct iwl_rxon_cmd *active = (void *)&ctx->active;
 193
 194         if (ctx->ctxid == IWL_RXON_CTX_BSS) {
 195                 ret = iwlagn_disable_bss(priv, ctx, &ctx->staging);
 196         } else {
 197                 ret = iwlagn_disable_pan(priv, ctx, &ctx->staging);
 198                 if (ret)
 199                         return ret;
 200                 if (ctx->vif) {
 201                         ret = iwl_send_rxon_timing(priv, ctx);
 202                         if (ret) {
 203                                 IWL_ERR(priv, "Failed to send timing (%d)!\n", ret);
 204                                 return ret;
 205                         }
 206                         ret = iwlagn_disconn_pan(priv, ctx, &ctx->staging);
 207                 }
 208         }
 209         if (ret)
 210                 return ret;
 211
 212         /*
 213          * Un-assoc RXON clears the station table and WEP
 214          * keys, so we have to restore those afterwards.
 215          */
 216         iwl_clear_ucode_stations(priv, ctx);
 217         /* update -- might need P2P now */
 218         iwl_update_bcast_station(priv, ctx);
 219         iwl_restore_stations(priv, ctx);
 220         ret = iwl_restore_default_wep_keys(priv, ctx);
 221         if (ret) {
 222                 IWL_ERR(priv, "Failed to restore WEP keys (%d)\n", ret);
 223                 return ret;
 224         }
 225
 226         memcpy(active, &ctx->staging, sizeof(*active));
 227         return 0;
 228 }
 229
 230 static int iwlagn_rxon_connect(struct iwl_priv *priv,
 231                                struct iwl_rxon_context *ctx)
 232 {
 233         int ret;
 234         struct iwl_rxon_cmd *active = (void *)&ctx->active;
 235
 236         /* RXON timing must be before associated RXON */
 237         if (ctx->ctxid == IWL_RXON_CTX_BSS) {
 238                 ret = iwl_send_rxon_timing(priv, ctx);
 239                 if (ret) {
 240                         IWL_ERR(priv, "Failed to send timing (%d)!\n", ret);
 241                         return ret;
 242                 }
 243         }
 244         /* QoS info may be cleared by previous un-assoc RXON */
 245         iwlagn_update_qos(priv, ctx);
 246
 247         /*
 248          * We'll run into this code path when beaconing is
 249          * enabled, but then we also need to send the beacon
 250          * to the device.
 251          */
 252         if (ctx->vif && (ctx->vif->type == NL80211_IFTYPE_AP)) {
 253                 ret = iwlagn_update_beacon(priv, ctx->vif);
 254                 if (ret) {
 255                         IWL_ERR(priv,
 256                                 "Error sending required beacon (%d)!\n",
 257                                 ret);
 258                         return ret;
 259                 }
 260         }
 261
 262         priv->start_calib = 0;
 263         /*
 264          * Apply the new configuration.
 265          *
 266          * Associated RXON doesn't clear the station table in uCode,
 267          * so we don't need to restore stations etc. after this.
 268          */
 269         ret = trans_send_cmd_pdu(priv, ctx->rxon_cmd, CMD_SYNC,
 270                       sizeof(struct iwl_rxon_cmd), &ctx->staging);
 271         if (ret) {
 272                 IWL_ERR(priv, "Error setting new RXON (%d)\n", ret);
 273                 return ret;
 274         }
 275         memcpy(active, &ctx->staging, sizeof(*active));
 276
 277         iwl_reprogram_ap_sta(priv, ctx);
 278
 279         /* IBSS beacon needs to be sent after setting assoc */
 280         if (ctx->vif && (ctx->vif->type == NL80211_IFTYPE_ADHOC))
 281                 if (iwlagn_update_beacon(priv, ctx->vif))
 282                         IWL_ERR(priv, "Error sending IBSS beacon\n");
 283         iwl_init_sensitivity(priv);
 284
 285         /*
 286          * If we issue a new RXON command which required a tune then
 287          * we must send a new TXPOWER command or we won't be able to
 288          * Tx any frames.
 289          *
 290          * It's expected we set power here if channel is changing.
 291          */
 292         ret = iwl_set_tx_power(priv, priv->tx_power_next, true);
 293         if (ret) {
 294                 IWL_ERR(priv, "Error sending TX power (%d)\n", ret);
 295                 return ret;
 296         }
 297
 298         if ((ctx->vif && ctx->vif->type == NL80211_IFTYPE_STATION) &&
 299             priv->cfg->ht_params->smps_mode)
 300                 ieee80211_request_smps(ctx->vif,
 301                                        priv->cfg->ht_params->smps_mode);
 302
 303         return 0;
 304 }
 305
 306 /**
 307  * iwlagn_commit_rxon - commit staging_rxon to hardware
 308  *
 309  * The RXON command in staging_rxon is committed to the hardware and
 310  * the active_rxon structure is updated with the new data.  This
 311  * function correctly transitions out of the RXON_ASSOC_MSK state if
 312  * a HW tune is required based on the RXON structure changes.
 313  *
 314  * The connect/disconnect flow should be as the following:
 315  *
 316  * 1. make sure send RXON command with association bit unset if not connect
 317  *      this should include the channel and the band for the candidate
 318  *      to be connected to
 319  * 2. Add Station before RXON association with the AP
 320  * 3. RXON_timing has to send before RXON for connection
 321  * 4. full RXON command - associated bit set
 322  * 5. use RXON_ASSOC command to update any flags changes
 323  */
 324 int iwlagn_commit_rxon(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 325 {
 326         /* cast away the const for active_rxon in this function */
 327         struct iwl_rxon_cmd *active = (void *)&ctx->active;
 328         bool new_assoc = !!(ctx->staging.filter_flags & RXON_FILTER_ASSOC_MSK);
 329         int ret;
 330
 331         lockdep_assert_held(&priv->mutex);
 332
 333         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 334                 return -EINVAL;
 335
 336         if (!iwl_is_alive(priv))
 337                 return -EBUSY;
 338
 339         /* This function hardcodes a bunch of dual-mode assumptions */
 340         BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
 341
 342         if (!ctx->is_active)
 343                 return 0;
 344
 345         /* always get timestamp with Rx frame */
 346         ctx->staging.flags |= RXON_FLG_TSF2HOST_MSK;
 347
 348         if (ctx->ctxid == IWL_RXON_CTX_PAN && priv->_agn.hw_roc_channel) {
 349                 struct ieee80211_channel *chan = priv->_agn.hw_roc_channel;
 350
 351                 iwl_set_rxon_channel(priv, chan, ctx);
 352                 iwl_set_flags_for_band(priv, ctx, chan->band, NULL);
 353                 ctx->staging.filter_flags |=
 354                         RXON_FILTER_ASSOC_MSK |
 355                         RXON_FILTER_PROMISC_MSK |
 356                         RXON_FILTER_CTL2HOST_MSK;
 357                 ctx->staging.dev_type = RXON_DEV_TYPE_P2P;
 358                 new_assoc = true;
 359
 360                 if (memcmp(&ctx->staging, &ctx->active,
 361                            sizeof(ctx->staging)) == 0)
 362                         return 0;
 363         }
 364
 365         /*
 366          * force CTS-to-self frames protection if RTS-CTS is not preferred
 367          * one aggregation protection method
 368          */
 369         if (!(priv->cfg->ht_params &&
 370               priv->cfg->ht_params->use_rts_for_aggregation))
 371                 ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
 372
 373         if ((ctx->vif && ctx->vif->bss_conf.use_short_slot) ||
 374             !(ctx->staging.flags & RXON_FLG_BAND_24G_MSK))
 375                 ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
 376         else
 377                 ctx->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;
 378
 379         iwl_print_rx_config_cmd(priv, ctx);
 380         ret = iwl_check_rxon_cmd(priv, ctx);
 381         if (ret) {
 382                 IWL_ERR(priv, "Invalid RXON configuration. Not committing.\n");
 383                 return -EINVAL;
 384         }
 385
 386         /*
 387          * receive commit_rxon request
 388          * abort any previous channel switch if still in process
 389          */
 390         if (test_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->status) &&
 391             (priv->switch_channel != ctx->staging.channel)) {
 392                 IWL_DEBUG_11H(priv, "abort channel switch on %d\n",
 393                               le16_to_cpu(priv->switch_channel));
 394                 iwl_chswitch_done(priv, false);
 395         }
 396
 397         /*
 398          * If we don't need to send a full RXON, we can use
 399          * iwl_rxon_assoc_cmd which is used to reconfigure filter
 400          * and other flags for the current radio configuration.
 401          */
 402         if (!iwl_full_rxon_required(priv, ctx)) {
 403                 ret = iwlagn_send_rxon_assoc(priv, ctx);
 404                 if (ret) {
 405                         IWL_ERR(priv, "Error setting RXON_ASSOC (%d)\n", ret);
 406                         return ret;
 407                 }
 408
 409                 memcpy(active, &ctx->staging, sizeof(*active));
 410                 /*
 411                  * We do not commit tx power settings while channel changing,
 412                  * do it now if after settings changed.
 413                  */
 414                 iwl_set_tx_power(priv, priv->tx_power_next, false);
 415
 416                 /* make sure we are in the right PS state */
 417                 iwl_power_update_mode(priv, true);
 418
 419                 return 0;
 420         }
 421
 422         iwl_set_rxon_hwcrypto(priv, ctx, !iwlagn_mod_params.sw_crypto);
 423
 424         IWL_DEBUG_INFO(priv,
 425                        "Going to commit RXON\n"
 426                        "  * with%s RXON_FILTER_ASSOC_MSK\n"
 427                        "  * channel = %d\n"
 428                        "  * bssid = %pM\n",
 429                        (new_assoc ? "" : "out"),
 430                        le16_to_cpu(ctx->staging.channel),
 431                        ctx->staging.bssid_addr);
 432
 433         /*
 434          * Always clear associated first, but with the correct config.
 435          * This is required as for example station addition for the
 436          * AP station must be done after the BSSID is set to correctly
 437          * set up filters in the device.
 438          */
 439         ret = iwlagn_rxon_disconn(priv, ctx);
 440         if (ret)
 441                 return ret;
 442
 443         ret = iwlagn_set_pan_params(priv);
 444         if (ret)
 445                 return ret;
 446
 447         if (new_assoc)
 448                 return iwlagn_rxon_connect(priv, ctx);
 449
 450         return 0;
 451 }
 452
 453 int iwlagn_mac_config(struct ieee80211_hw *hw, u32 changed)
 454 {
 455         struct iwl_priv *priv = hw->priv;
 456         struct iwl_rxon_context *ctx;
 457         struct ieee80211_conf *conf = &hw->conf;
 458         struct ieee80211_channel *channel = conf->channel;
 459         const struct iwl_channel_info *ch_info;
 460         int ret = 0;
 461
 462         IWL_DEBUG_MAC80211(priv, "changed %#x", changed);
 463
 464         mutex_lock(&priv->mutex);
 465
 466         if (unlikely(test_bit(STATUS_SCANNING, &priv->status))) {
 467                 IWL_DEBUG_MAC80211(priv, "leave - scanning\n");
 468                 goto out;
 469         }
 470
 471         if (!iwl_is_ready(priv)) {
 472                 IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
 473                 goto out;
 474         }
 475
 476         if (changed & (IEEE80211_CONF_CHANGE_SMPS |
 477                        IEEE80211_CONF_CHANGE_CHANNEL)) {
 478                 /* mac80211 uses static for non-HT which is what we want */
 479                 priv->current_ht_config.smps = conf->smps_mode;
 480
 481                 /*
 482                  * Recalculate chain counts.
 483                  *
 484                  * If monitor mode is enabled then mac80211 will
 485                  * set up the SM PS mode to OFF if an HT channel is
 486                  * configured.
 487                  */
 488                 for_each_context(priv, ctx)
 489                         iwlagn_set_rxon_chain(priv, ctx);
 490         }
 491
 492         if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
 493                 unsigned long flags;
 494
 495                 ch_info = iwl_get_channel_info(priv, channel->band,
 496                                                channel->hw_value);
 497                 if (!is_channel_valid(ch_info)) {
 498                         IWL_DEBUG_MAC80211(priv, "leave - invalid channel\n");
 499                         ret = -EINVAL;
 500                         goto out;
 501                 }
 502
 503                 spin_lock_irqsave(&priv->lock, flags);
 504
 505                 for_each_context(priv, ctx) {
 506                         /* Configure HT40 channels */
 507                         if (ctx->ht.enabled != conf_is_ht(conf))
 508                                 ctx->ht.enabled = conf_is_ht(conf);
 509
 510                         if (ctx->ht.enabled) {
 511                                 if (conf_is_ht40_minus(conf)) {
 512                                         ctx->ht.extension_chan_offset =
 513                                                 IEEE80211_HT_PARAM_CHA_SEC_BELOW;
 514                                         ctx->ht.is_40mhz = true;
 515                                 } else if (conf_is_ht40_plus(conf)) {
 516                                         ctx->ht.extension_chan_offset =
 517                                                 IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
 518                                         ctx->ht.is_40mhz = true;
 519                                 } else {
 520                                         ctx->ht.extension_chan_offset =
 521                                                 IEEE80211_HT_PARAM_CHA_SEC_NONE;
 522                                         ctx->ht.is_40mhz = false;
 523                                 }
 524                         } else
 525                                 ctx->ht.is_40mhz = false;
 526
 527                         /*
 528                          * Default to no protection. Protection mode will
 529                          * later be set from BSS config in iwl_ht_conf
 530                          */
 531                         ctx->ht.protection = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
 532
 533                         /* if we are switching from ht to 2.4 clear flags
 534                          * from any ht related info since 2.4 does not
 535                          * support ht */
 536                         if (le16_to_cpu(ctx->staging.channel) !=
 537                             channel->hw_value)
 538                                 ctx->staging.flags = 0;
 539
 540                         iwl_set_rxon_channel(priv, channel, ctx);
 541                         iwl_set_rxon_ht(priv, &priv->current_ht_config);
 542
 543                         iwl_set_flags_for_band(priv, ctx, channel->band,
 544                                                ctx->vif);
 545                 }
 546
 547                 spin_unlock_irqrestore(&priv->lock, flags);
 548
 549                 iwl_update_bcast_stations(priv);
 550
 551                 /*
 552                  * The list of supported rates and rate mask can be different
 553                  * for each band; since the band may have changed, reset
 554                  * the rate mask to what mac80211 lists.
 555                  */
 556                 iwl_set_rate(priv);
 557         }
 558
 559         if (changed & (IEEE80211_CONF_CHANGE_PS |
 560                         IEEE80211_CONF_CHANGE_IDLE)) {
 561                 ret = iwl_power_update_mode(priv, false);
 562                 if (ret)
 563                         IWL_DEBUG_MAC80211(priv, "Error setting sleep level\n");
 564         }
 565
 566         if (changed & IEEE80211_CONF_CHANGE_POWER) {
 567                 IWL_DEBUG_MAC80211(priv, "TX Power old=%d new=%d\n",
 568                         priv->tx_power_user_lmt, conf->power_level);
 569
 570                 iwl_set_tx_power(priv, conf->power_level, false);
 571         }
 572
 573         for_each_context(priv, ctx) {
 574                 if (!memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
 575                         continue;
 576                 iwlagn_commit_rxon(priv, ctx);
 577         }
 578  out:
 579         mutex_unlock(&priv->mutex);
 580         return ret;
 581 }
 582
 583 static void iwlagn_check_needed_chains(struct iwl_priv *priv,
 584                                        struct iwl_rxon_context *ctx,
 585                                        struct ieee80211_bss_conf *bss_conf)
 586 {
 587         struct ieee80211_vif *vif = ctx->vif;
 588         struct iwl_rxon_context *tmp;
 589         struct ieee80211_sta *sta;
 590         struct iwl_ht_config *ht_conf = &priv->current_ht_config;
 591         struct ieee80211_sta_ht_cap *ht_cap;
 592         bool need_multiple;
 593
 594         lockdep_assert_held(&priv->mutex);
 595
 596         switch (vif->type) {
 597         case NL80211_IFTYPE_STATION:
 598                 rcu_read_lock();
 599                 sta = ieee80211_find_sta(vif, bss_conf->bssid);
 600                 if (!sta) {
 601                         /*
 602                          * If at all, this can only happen through a race
 603                          * when the AP disconnects us while we're still
 604                          * setting up the connection, in that case mac80211
 605                          * will soon tell us about that.
 606                          */
 607                         need_multiple = false;
 608                         rcu_read_unlock();
 609                         break;
 610                 }
 611
 612                 ht_cap = &sta->ht_cap;
 613
 614                 need_multiple = true;
 615
 616                 /*
 617                  * If the peer advertises no support for receiving 2 and 3
 618                  * stream MCS rates, it can't be transmitting them either.
 619                  */
 620                 if (ht_cap->mcs.rx_mask[1] == 0 &&
 621                     ht_cap->mcs.rx_mask[2] == 0) {
 622                         need_multiple = false;
 623                 } else if (!(ht_cap->mcs.tx_params &
 624                                                 IEEE80211_HT_MCS_TX_DEFINED)) {
 625                         /* If it can't TX MCS at all ... */
 626                         need_multiple = false;
 627                 } else if (ht_cap->mcs.tx_params &
 628                                                 IEEE80211_HT_MCS_TX_RX_DIFF) {
 629                         int maxstreams;
 630
 631                         /*
 632                          * But if it can receive them, it might still not
 633                          * be able to transmit them, which is what we need
 634                          * to check here -- so check the number of streams
 635                          * it advertises for TX (if different from RX).
 636                          */
 637
 638                         maxstreams = (ht_cap->mcs.tx_params &
 639                                  IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK);
 640                         maxstreams >>=
 641                                 IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT;
 642                         maxstreams += 1;
 643
 644                         if (maxstreams <= 1)
 645                                 need_multiple = false;
 646                 }
 647
 648                 rcu_read_unlock();
 649                 break;
 650         case NL80211_IFTYPE_ADHOC:
 651                 /* currently */
 652                 need_multiple = false;
 653                 break;
 654         default:
 655                 /* only AP really */
 656                 need_multiple = true;
 657                 break;
 658         }
 659
 660         ctx->ht_need_multiple_chains = need_multiple;
 661
 662         if (!need_multiple) {
 663                 /* check all contexts */
 664                 for_each_context(priv, tmp) {
 665                         if (!tmp->vif)
 666                                 continue;
 667                         if (tmp->ht_need_multiple_chains) {
 668                                 need_multiple = true;
 669                                 break;
 670                         }
 671                 }
 672         }
 673
 674         ht_conf->single_chain_sufficient = !need_multiple;
 675 }
 676
 677 static void iwlagn_chain_noise_reset(struct iwl_priv *priv)
 678 {
 679         struct iwl_chain_noise_data *data = &priv->chain_noise_data;
 680         int ret;
 681
 682         if ((data->state == IWL_CHAIN_NOISE_ALIVE) &&
 683             iwl_is_any_associated(priv)) {
 684                 struct iwl_calib_chain_noise_reset_cmd cmd;
 685
 686                 /* clear data for chain noise calibration algorithm */
 687                 data->chain_noise_a = 0;
 688                 data->chain_noise_b = 0;
 689                 data->chain_noise_c = 0;
 690                 data->chain_signal_a = 0;
 691                 data->chain_signal_b = 0;
 692                 data->chain_signal_c = 0;
 693                 data->beacon_count = 0;
 694
 695                 memset(&cmd, 0, sizeof(cmd));
 696                 iwl_set_calib_hdr(&cmd.hdr,
 697                         priv->_agn.phy_calib_chain_noise_reset_cmd);
 698                 ret = trans_send_cmd_pdu(priv,
 699                                         REPLY_PHY_CALIBRATION_CMD,
 700                                         CMD_SYNC, sizeof(cmd), &cmd);
 701                 if (ret)
 702                         IWL_ERR(priv,
 703                                 "Could not send REPLY_PHY_CALIBRATION_CMD\n");
 704                 data->state = IWL_CHAIN_NOISE_ACCUMULATE;
 705                 IWL_DEBUG_CALIB(priv, "Run chain_noise_calibrate\n");
 706         }
 707 }
 708
 709 void iwlagn_bss_info_changed(struct ieee80211_hw *hw,
 710                              struct ieee80211_vif *vif,
 711                              struct ieee80211_bss_conf *bss_conf,
 712                              u32 changes)
 713 {
 714         struct iwl_priv *priv = hw->priv;
 715         struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
 716         int ret;
 717         bool force = false;
 718
 719         mutex_lock(&priv->mutex);
 720
 721         if (unlikely(!iwl_is_ready(priv))) {
 722                 IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
 723                 mutex_unlock(&priv->mutex);
 724                 return;
 725         }
 726
 727         if (unlikely(!ctx->vif)) {
 728                 IWL_DEBUG_MAC80211(priv, "leave - vif is NULL\n");
 729                 mutex_unlock(&priv->mutex);
 730                 return;
 731         }
 732
 733         if (changes & BSS_CHANGED_BEACON_INT)
 734                 force = true;
 735
 736         if (changes & BSS_CHANGED_QOS) {
 737                 ctx->qos_data.qos_active = bss_conf->qos;
 738                 iwlagn_update_qos(priv, ctx);
 739         }
 740
 741         ctx->staging.assoc_id = cpu_to_le16(vif->bss_conf.aid);
 742         if (vif->bss_conf.use_short_preamble)
 743                 ctx->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
 744         else
 745                 ctx->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
 746
 747         if (changes & BSS_CHANGED_ASSOC) {
 748                 if (bss_conf->assoc) {
 749                         priv->timestamp = bss_conf->timestamp;
 750                         ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
 751                 } else {
 752                         /*
 753                          * If we disassociate while there are pending
 754                          * frames, just wake up the queues and let the
 755                          * frames "escape" ... This shouldn't really
 756                          * be happening to start with, but we should
 757                          * not get stuck in this case either since it
 758                          * can happen if userspace gets confused.
 759                          */
 760                         if (ctx->last_tx_rejected) {
 761                                 ctx->last_tx_rejected = false;
 762                                 iwl_wake_any_queue(priv, ctx);
 763                         }
 764                         ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
 765                 }
 766
 767                 iwlagn_bt_coex_rssi_monitor(priv);
 768         }
 769
 770         if (ctx->ht.enabled) {
 771                 ctx->ht.protection = bss_conf->ht_operation_mode &
 772                                         IEEE80211_HT_OP_MODE_PROTECTION;
 773                 ctx->ht.non_gf_sta_present = !!(bss_conf->ht_operation_mode &
 774                                         IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT);
 775                 iwlagn_check_needed_chains(priv, ctx, bss_conf);
 776                 iwl_set_rxon_ht(priv, &priv->current_ht_config);
 777         }
 778
 779         iwlagn_set_rxon_chain(priv, ctx);
 780
 781         if (bss_conf->use_cts_prot && (priv->band != IEEE80211_BAND_5GHZ))
 782                 ctx->staging.flags |= RXON_FLG_TGG_PROTECT_MSK;
 783         else
 784                 ctx->staging.flags &= ~RXON_FLG_TGG_PROTECT_MSK;
 785
 786         if (bss_conf->use_cts_prot)
 787                 ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
 788         else
 789                 ctx->staging.flags &= ~RXON_FLG_SELF_CTS_EN;
 790
 791         memcpy(ctx->staging.bssid_addr, bss_conf->bssid, ETH_ALEN);
 792
 793         if (vif->type == NL80211_IFTYPE_AP ||
 794             vif->type == NL80211_IFTYPE_ADHOC) {
 795                 if (vif->bss_conf.enable_beacon) {
 796                         ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
 797                         priv->beacon_ctx = ctx;
 798                 } else {
 799                         ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
 800                         priv->beacon_ctx = NULL;
 801                 }
 802         }
 803
 804         if (force || memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
 805                 iwlagn_commit_rxon(priv, ctx);
 806
 807         if (changes & BSS_CHANGED_ASSOC && bss_conf->assoc) {
 808                 /*
 809                  * The chain noise calibration will enable PM upon
 810                  * completion. If calibration has already been run
 811                  * then we need to enable power management here.
 812                  */
 813                 if (priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE)
 814                         iwl_power_update_mode(priv, false);
 815
 816                 /* Enable RX differential gain and sensitivity calibrations */
 817                 if (!priv->disable_chain_noise_cal)
 818                         iwlagn_chain_noise_reset(priv);
 819                 priv->start_calib = 1;
 820         }
 821
 822         if (changes & BSS_CHANGED_IBSS) {
 823                 ret = iwlagn_manage_ibss_station(priv, vif,
 824                                                  bss_conf->ibss_joined);
 825                 if (ret)
 826                         IWL_ERR(priv, "failed to %s IBSS station %pM\n",
 827                                 bss_conf->ibss_joined ? "add" : "remove",
 828                                 bss_conf->bssid);
 829         }
 830
 831         if (changes & BSS_CHANGED_BEACON && vif->type == NL80211_IFTYPE_ADHOC &&
 832             priv->beacon_ctx) {
 833                 if (iwlagn_update_beacon(priv, vif))
 834                         IWL_ERR(priv, "Error sending IBSS beacon\n");
 835         }
 836
 837         mutex_unlock(&priv->mutex);
 838 }
 839
 840 void iwlagn_post_scan(struct iwl_priv *priv)
 841 {
 842         struct iwl_rxon_context *ctx;
 843
 844         /*
 845          * We do not commit power settings while scan is pending,
 846          * do it now if the settings changed.
 847          */
 848         iwl_power_set_mode(priv, &priv->power_data.sleep_cmd_next, false);
 849         iwl_set_tx_power(priv, priv->tx_power_next, false);
 850
 851         /*
 852          * Since setting the RXON may have been deferred while
 853          * performing the scan, fire one off if needed
 854          */
 855         for_each_context(priv, ctx)
 856                 if (memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
 857                         iwlagn_commit_rxon(priv, ctx);
 858
 859         iwlagn_set_pan_params(priv);
 860 }