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