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 #include "iwl-shared.h"
  35
  36 static int iwlagn_disable_bss(struct iwl_priv *priv,
  37                               struct iwl_rxon_context *ctx,
  38                               struct iwl_rxon_cmd *send)
  39 {
  40         __le32 old_filter = send->filter_flags;
  41         int ret;
  42
  43         send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
  44         ret = iwl_trans_send_cmd_pdu(trans(priv), ctx->rxon_cmd,
  45                                 CMD_SYNC, sizeof(*send), send);
  46
  47         send->filter_flags = old_filter;
  48
  49         if (ret)
  50                 IWL_ERR(priv, "Error clearing ASSOC_MSK on BSS (%d)\n", ret);
  51
  52         return ret;
  53 }
  54
  55 static int iwlagn_disable_pan(struct iwl_priv *priv,
  56                               struct iwl_rxon_context *ctx,
  57                               struct iwl_rxon_cmd *send)
  58 {
  59         struct iwl_notification_wait disable_wait;
  60         __le32 old_filter = send->filter_flags;
  61         u8 old_dev_type = send->dev_type;
  62         int ret;
  63
  64         iwlagn_init_notification_wait(priv, &disable_wait,
  65                                       REPLY_WIPAN_DEACTIVATION_COMPLETE,
  66                                       NULL, NULL);
  67
  68         send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
  69         send->dev_type = RXON_DEV_TYPE_P2P;
  70         ret = iwl_trans_send_cmd_pdu(trans(priv), ctx->rxon_cmd,
  71                                 CMD_SYNC, sizeof(*send), send);
  72
  73         send->filter_flags = old_filter;
  74         send->dev_type = old_dev_type;
  75
  76         if (ret) {
  77                 IWL_ERR(priv, "Error disabling PAN (%d)\n", ret);
  78                 iwlagn_remove_notification(priv, &disable_wait);
  79         } else {
  80                 ret = iwlagn_wait_notification(priv, &disable_wait, HZ);
  81                 if (ret)
  82                         IWL_ERR(priv, "Timed out waiting for PAN disable\n");
  83         }
  84
  85         return ret;
  86 }
  87
  88 static int iwlagn_disconn_pan(struct iwl_priv *priv,
  89                               struct iwl_rxon_context *ctx,
  90                               struct iwl_rxon_cmd *send)
  91 {
  92         __le32 old_filter = send->filter_flags;
  93         int ret;
  94
  95         send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
  96         ret = iwl_trans_send_cmd_pdu(trans(priv), ctx->rxon_cmd, CMD_SYNC,
  97                                 sizeof(*send), send);
  98
  99         send->filter_flags = old_filter;
 100
 101         return ret;
 102 }
 103
 104 static void iwlagn_update_qos(struct iwl_priv *priv,
 105                               struct iwl_rxon_context *ctx)
 106 {
 107         int ret;
 108
 109         if (!ctx->is_active)
 110                 return;
 111
 112         ctx->qos_data.def_qos_parm.qos_flags = 0;
 113
 114         if (ctx->qos_data.qos_active)
 115                 ctx->qos_data.def_qos_parm.qos_flags |=
 116                         QOS_PARAM_FLG_UPDATE_EDCA_MSK;
 117
 118         if (ctx->ht.enabled)
 119                 ctx->qos_data.def_qos_parm.qos_flags |= QOS_PARAM_FLG_TGN_MSK;
 120
 121         IWL_DEBUG_QOS(priv, "send QoS cmd with Qos active=%d FLAGS=0x%X\n",
 122                       ctx->qos_data.qos_active,
 123                       ctx->qos_data.def_qos_parm.qos_flags);
 124
 125         ret = iwl_trans_send_cmd_pdu(trans(priv), ctx->qos_cmd, CMD_SYNC,
 126                                sizeof(struct iwl_qosparam_cmd),
 127                                &ctx->qos_data.def_qos_parm);
 128         if (ret)
 129                 IWL_ERR(priv, "Failed to update QoS\n");
 130 }
 131
 132 static int iwlagn_update_beacon(struct iwl_priv *priv,
 133                                 struct ieee80211_vif *vif)
 134 {
 135         lockdep_assert_held(&priv->shrd->mutex);
 136
 137         dev_kfree_skb(priv->beacon_skb);
 138         priv->beacon_skb = ieee80211_beacon_get(priv->hw, vif);
 139         if (!priv->beacon_skb)
 140                 return -ENOMEM;
 141         return iwlagn_send_beacon_cmd(priv);
 142 }
 143
 144 static int iwlagn_send_rxon_assoc(struct iwl_priv *priv,
 145                            struct iwl_rxon_context *ctx)
 146 {
 147         int ret = 0;
 148         struct iwl_rxon_assoc_cmd rxon_assoc;
 149         const struct iwl_rxon_cmd *rxon1 = &ctx->staging;
 150         const struct iwl_rxon_cmd *rxon2 = &ctx->active;
 151
 152         if ((rxon1->flags == rxon2->flags) &&
 153             (rxon1->filter_flags == rxon2->filter_flags) &&
 154             (rxon1->cck_basic_rates == rxon2->cck_basic_rates) &&
 155             (rxon1->ofdm_ht_single_stream_basic_rates ==
 156              rxon2->ofdm_ht_single_stream_basic_rates) &&
 157             (rxon1->ofdm_ht_dual_stream_basic_rates ==
 158              rxon2->ofdm_ht_dual_stream_basic_rates) &&
 159             (rxon1->ofdm_ht_triple_stream_basic_rates ==
 160              rxon2->ofdm_ht_triple_stream_basic_rates) &&
 161             (rxon1->acquisition_data == rxon2->acquisition_data) &&
 162             (rxon1->rx_chain == rxon2->rx_chain) &&
 163             (rxon1->ofdm_basic_rates == rxon2->ofdm_basic_rates)) {
 164                 IWL_DEBUG_INFO(priv, "Using current RXON_ASSOC.  Not resending.\n");
 165                 return 0;
 166         }
 167
 168         rxon_assoc.flags = ctx->staging.flags;
 169         rxon_assoc.filter_flags = ctx->staging.filter_flags;
 170         rxon_assoc.ofdm_basic_rates = ctx->staging.ofdm_basic_rates;
 171         rxon_assoc.cck_basic_rates = ctx->staging.cck_basic_rates;
 172         rxon_assoc.reserved1 = 0;
 173         rxon_assoc.reserved2 = 0;
 174         rxon_assoc.reserved3 = 0;
 175         rxon_assoc.ofdm_ht_single_stream_basic_rates =
 176             ctx->staging.ofdm_ht_single_stream_basic_rates;
 177         rxon_assoc.ofdm_ht_dual_stream_basic_rates =
 178             ctx->staging.ofdm_ht_dual_stream_basic_rates;
 179         rxon_assoc.rx_chain_select_flags = ctx->staging.rx_chain;
 180         rxon_assoc.ofdm_ht_triple_stream_basic_rates =
 181                  ctx->staging.ofdm_ht_triple_stream_basic_rates;
 182         rxon_assoc.acquisition_data = ctx->staging.acquisition_data;
 183
 184         ret = iwl_trans_send_cmd_pdu(trans(priv), ctx->rxon_assoc_cmd,
 185                                 CMD_ASYNC, sizeof(rxon_assoc), &rxon_assoc);
 186         return ret;
 187 }
 188
 189 static int iwlagn_rxon_disconn(struct iwl_priv *priv,
 190                                struct iwl_rxon_context *ctx)
 191 {
 192         int ret;
 193         struct iwl_rxon_cmd *active = (void *)&ctx->active;
 194
 195         if (ctx->ctxid == IWL_RXON_CTX_BSS) {
 196                 ret = iwlagn_disable_bss(priv, ctx, &ctx->staging);
 197         } else {
 198                 ret = iwlagn_disable_pan(priv, ctx, &ctx->staging);
 199                 if (ret)
 200                         return ret;
 201                 if (ctx->vif) {
 202                         ret = iwl_send_rxon_timing(priv, ctx);
 203                         if (ret) {
 204                                 IWL_ERR(priv, "Failed to send timing (%d)!\n", ret);
 205                                 return ret;
 206                         }
 207                         ret = iwlagn_disconn_pan(priv, ctx, &ctx->staging);
 208                 }
 209         }
 210         if (ret)
 211                 return ret;
 212
 213         /*
 214          * Un-assoc RXON clears the station table and WEP
 215          * keys, so we have to restore those afterwards.
 216          */
 217         iwl_clear_ucode_stations(priv, ctx);
 218         /* update -- might need P2P now */
 219         iwl_update_bcast_station(priv, ctx);
 220         iwl_restore_stations(priv, ctx);
 221         ret = iwl_restore_default_wep_keys(priv, ctx);
 222         if (ret) {
 223                 IWL_ERR(priv, "Failed to restore WEP keys (%d)\n", ret);
 224                 return ret;
 225         }
 226
 227         memcpy(active, &ctx->staging, sizeof(*active));
 228         return 0;
 229 }
 230
 231 static int iwlagn_rxon_connect(struct iwl_priv *priv,
 232                                struct iwl_rxon_context *ctx)
 233 {
 234         int ret;
 235         struct iwl_rxon_cmd *active = (void *)&ctx->active;
 236
 237         /* RXON timing must be before associated RXON */
 238         if (ctx->ctxid == IWL_RXON_CTX_BSS) {
 239                 ret = iwl_send_rxon_timing(priv, ctx);
 240                 if (ret) {
 241                         IWL_ERR(priv, "Failed to send timing (%d)!\n", ret);
 242                         return ret;
 243                 }
 244         }
 245         /* QoS info may be cleared by previous un-assoc RXON */
 246         iwlagn_update_qos(priv, ctx);
 247
 248         /*
 249          * We'll run into this code path when beaconing is
 250          * enabled, but then we also need to send the beacon
 251          * to the device.
 252          */
 253         if (ctx->vif && (ctx->vif->type == NL80211_IFTYPE_AP)) {
 254                 ret = iwlagn_update_beacon(priv, ctx->vif);
 255                 if (ret) {
 256                         IWL_ERR(priv,
 257                                 "Error sending required beacon (%d)!\n",
 258                                 ret);
 259                         return ret;
 260                 }
 261         }
 262
 263         priv->start_calib = 0;
 264         /*
 265          * Apply the new configuration.
 266          *
 267          * Associated RXON doesn't clear the station table in uCode,
 268          * so we don't need to restore stations etc. after this.
 269          */
 270         ret = iwl_trans_send_cmd_pdu(trans(priv), ctx->rxon_cmd, CMD_SYNC,
 271                       sizeof(struct iwl_rxon_cmd), &ctx->staging);
 272         if (ret) {
 273                 IWL_ERR(priv, "Error setting new RXON (%d)\n", ret);
 274                 return ret;
 275         }
 276         memcpy(active, &ctx->staging, sizeof(*active));
 277
 278         iwl_reprogram_ap_sta(priv, ctx);
 279
 280         /* IBSS beacon needs to be sent after setting assoc */
 281         if (ctx->vif && (ctx->vif->type == NL80211_IFTYPE_ADHOC))
 282                 if (iwlagn_update_beacon(priv, ctx->vif))
 283                         IWL_ERR(priv, "Error sending IBSS beacon\n");
 284         iwl_init_sensitivity(priv);
 285
 286         /*
 287          * If we issue a new RXON command which required a tune then
 288          * we must send a new TXPOWER command or we won't be able to
 289          * Tx any frames.
 290          *
 291          * It's expected we set power here if channel is changing.
 292          */
 293         ret = iwl_set_tx_power(priv, priv->tx_power_next, true);
 294         if (ret) {
 295                 IWL_ERR(priv, "Error sending TX power (%d)\n", ret);
 296                 return ret;
 297         }
 298
 299         if ((ctx->vif && ctx->vif->type == NL80211_IFTYPE_STATION) &&
 300             priv->cfg->ht_params->smps_mode)
 301                 ieee80211_request_smps(ctx->vif,
 302                                        priv->cfg->ht_params->smps_mode);
 303
 304         return 0;
 305 }
 306
 307 int iwlagn_set_pan_params(struct iwl_priv *priv)
 308 {
 309         struct iwl_wipan_params_cmd cmd;
 310         struct iwl_rxon_context *ctx_bss, *ctx_pan;
 311         int slot0 = 300, slot1 = 0;
 312         int ret;
 313
 314         if (priv->shrd->valid_contexts == BIT(IWL_RXON_CTX_BSS))
 315                 return 0;
 316
 317         BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
 318
 319         lockdep_assert_held(&priv->shrd->mutex);
 320
 321         ctx_bss = &priv->contexts[IWL_RXON_CTX_BSS];
 322         ctx_pan = &priv->contexts[IWL_RXON_CTX_PAN];
 323
 324         /*
 325          * If the PAN context is inactive, then we don't need
 326          * to update the PAN parameters, the last thing we'll
 327          * have done before it goes inactive is making the PAN
 328          * parameters be WLAN-only.
 329          */
 330         if (!ctx_pan->is_active)
 331                 return 0;
 332
 333         memset(&cmd, 0, sizeof(cmd));
 334
 335         /* only 2 slots are currently allowed */
 336         cmd.num_slots = 2;
 337
 338         cmd.slots[0].type = 0; /* BSS */
 339         cmd.slots[1].type = 1; /* PAN */
 340
 341         if (priv->hw_roc_setup) {
 342                 /* both contexts must be used for this to happen */
 343                 slot1 = IWL_MIN_SLOT_TIME;
 344                 slot0 = 3000;
 345         } else if (ctx_bss->vif && ctx_pan->vif) {
 346                 int bcnint = ctx_pan->beacon_int;
 347                 int dtim = ctx_pan->vif->bss_conf.dtim_period ?: 1;
 348
 349                 /* should be set, but seems unused?? */
 350                 cmd.flags |= cpu_to_le16(IWL_WIPAN_PARAMS_FLG_SLOTTED_MODE);
 351
 352                 if (ctx_pan->vif->type == NL80211_IFTYPE_AP &&
 353                     bcnint &&
 354                     bcnint != ctx_bss->beacon_int) {
 355                         IWL_ERR(priv,
 356                                 "beacon intervals don't match (%d, %d)\n",
 357                                 ctx_bss->beacon_int, ctx_pan->beacon_int);
 358                 } else
 359                         bcnint = max_t(int, bcnint,
 360                                        ctx_bss->beacon_int);
 361                 if (!bcnint)
 362                         bcnint = DEFAULT_BEACON_INTERVAL;
 363                 slot0 = bcnint / 2;
 364                 slot1 = bcnint - slot0;
 365
 366                 if (test_bit(STATUS_SCAN_HW, &priv->shrd->status) ||
 367                     (!ctx_bss->vif->bss_conf.idle &&
 368                      !ctx_bss->vif->bss_conf.assoc)) {
 369                         slot0 = dtim * bcnint * 3 - IWL_MIN_SLOT_TIME;
 370                         slot1 = IWL_MIN_SLOT_TIME;
 371                 } else if (!ctx_pan->vif->bss_conf.idle &&
 372                            !ctx_pan->vif->bss_conf.assoc) {
 373                         slot1 = dtim * bcnint * 3 - IWL_MIN_SLOT_TIME;
 374                         slot0 = IWL_MIN_SLOT_TIME;
 375                 }
 376         } else if (ctx_pan->vif) {
 377                 slot0 = 0;
 378                 slot1 = max_t(int, 1, ctx_pan->vif->bss_conf.dtim_period) *
 379                                         ctx_pan->beacon_int;
 380                 slot1 = max_t(int, DEFAULT_BEACON_INTERVAL, slot1);
 381
 382                 if (test_bit(STATUS_SCAN_HW, &priv->shrd->status)) {
 383                         slot0 = slot1 * 3 - IWL_MIN_SLOT_TIME;
 384                         slot1 = IWL_MIN_SLOT_TIME;
 385                 }
 386         }
 387
 388         cmd.slots[0].width = cpu_to_le16(slot0);
 389         cmd.slots[1].width = cpu_to_le16(slot1);
 390
 391         ret = iwl_trans_send_cmd_pdu(trans(priv), REPLY_WIPAN_PARAMS, CMD_SYNC,
 392                         sizeof(cmd), &cmd);
 393         if (ret)
 394                 IWL_ERR(priv, "Error setting PAN parameters (%d)\n", ret);
 395
 396         return ret;
 397 }
 398
 399 /**
 400  * iwlagn_commit_rxon - commit staging_rxon to hardware
 401  *
 402  * The RXON command in staging_rxon is committed to the hardware and
 403  * the active_rxon structure is updated with the new data.  This
 404  * function correctly transitions out of the RXON_ASSOC_MSK state if
 405  * a HW tune is required based on the RXON structure changes.
 406  *
 407  * The connect/disconnect flow should be as the following:
 408  *
 409  * 1. make sure send RXON command with association bit unset if not connect
 410  *      this should include the channel and the band for the candidate
 411  *      to be connected to
 412  * 2. Add Station before RXON association with the AP
 413  * 3. RXON_timing has to send before RXON for connection
 414  * 4. full RXON command - associated bit set
 415  * 5. use RXON_ASSOC command to update any flags changes
 416  */
 417 int iwlagn_commit_rxon(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 418 {
 419         /* cast away the const for active_rxon in this function */
 420         struct iwl_rxon_cmd *active = (void *)&ctx->active;
 421         bool new_assoc = !!(ctx->staging.filter_flags & RXON_FILTER_ASSOC_MSK);
 422         int ret;
 423
 424         lockdep_assert_held(&priv->shrd->mutex);
 425
 426         if (test_bit(STATUS_EXIT_PENDING, &priv->shrd->status))
 427                 return -EINVAL;
 428
 429         if (!iwl_is_alive(priv->shrd))
 430                 return -EBUSY;
 431
 432         /* This function hardcodes a bunch of dual-mode assumptions */
 433         BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
 434
 435         if (!ctx->is_active)
 436                 return 0;
 437
 438         /* override BSSID if necessary due to preauth */
 439         if (ctx->preauth_bssid)
 440                 memcpy(ctx->staging.bssid_addr, ctx->bssid, ETH_ALEN);
 441
 442         /* always get timestamp with Rx frame */
 443         ctx->staging.flags |= RXON_FLG_TSF2HOST_MSK;
 444
 445         /*
 446          * force CTS-to-self frames protection if RTS-CTS is not preferred
 447          * one aggregation protection method
 448          */
 449         if (!(priv->cfg->ht_params &&
 450               priv->cfg->ht_params->use_rts_for_aggregation))
 451                 ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
 452
 453         if ((ctx->vif && ctx->vif->bss_conf.use_short_slot) ||
 454             !(ctx->staging.flags & RXON_FLG_BAND_24G_MSK))
 455                 ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
 456         else
 457                 ctx->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;
 458
 459         iwl_print_rx_config_cmd(priv, ctx->ctxid);
 460         ret = iwl_check_rxon_cmd(priv, ctx);
 461         if (ret) {
 462                 IWL_ERR(priv, "Invalid RXON configuration. Not committing.\n");
 463                 return -EINVAL;
 464         }
 465
 466         /*
 467          * receive commit_rxon request
 468          * abort any previous channel switch if still in process
 469          */
 470         if (test_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->shrd->status) &&
 471             (priv->switch_channel != ctx->staging.channel)) {
 472                 IWL_DEBUG_11H(priv, "abort channel switch on %d\n",
 473                               le16_to_cpu(priv->switch_channel));
 474                 iwl_chswitch_done(priv, false);
 475         }
 476
 477         /*
 478          * If we don't need to send a full RXON, we can use
 479          * iwl_rxon_assoc_cmd which is used to reconfigure filter
 480          * and other flags for the current radio configuration.
 481          */
 482         if (!iwl_full_rxon_required(priv, ctx)) {
 483                 ret = iwlagn_send_rxon_assoc(priv, ctx);
 484                 if (ret) {
 485                         IWL_ERR(priv, "Error setting RXON_ASSOC (%d)\n", ret);
 486                         return ret;
 487                 }
 488
 489                 memcpy(active, &ctx->staging, sizeof(*active));
 490                 /*
 491                  * We do not commit tx power settings while channel changing,
 492                  * do it now if after settings changed.
 493                  */
 494                 iwl_set_tx_power(priv, priv->tx_power_next, false);
 495
 496                 /* make sure we are in the right PS state */
 497                 iwl_power_update_mode(priv, true);
 498
 499                 return 0;
 500         }
 501
 502         iwl_set_rxon_hwcrypto(priv, ctx, !iwlagn_mod_params.sw_crypto);
 503
 504         IWL_DEBUG_INFO(priv,
 505                        "Going to commit RXON\n"
 506                        "  * with%s RXON_FILTER_ASSOC_MSK\n"
 507                        "  * channel = %d\n"
 508                        "  * bssid = %pM\n",
 509                        (new_assoc ? "" : "out"),
 510                        le16_to_cpu(ctx->staging.channel),
 511                        ctx->staging.bssid_addr);
 512
 513         /*
 514          * Always clear associated first, but with the correct config.
 515          * This is required as for example station addition for the
 516          * AP station must be done after the BSSID is set to correctly
 517          * set up filters in the device.
 518          */
 519         ret = iwlagn_rxon_disconn(priv, ctx);
 520         if (ret)
 521                 return ret;
 522
 523         ret = iwlagn_set_pan_params(priv);
 524         if (ret)
 525                 return ret;
 526
 527         if (new_assoc)
 528                 return iwlagn_rxon_connect(priv, ctx);
 529
 530         return 0;
 531 }
 532
 533 int iwlagn_mac_config(struct ieee80211_hw *hw, u32 changed)
 534 {
 535         struct iwl_priv *priv = hw->priv;
 536         struct iwl_rxon_context *ctx;
 537         struct ieee80211_conf *conf = &hw->conf;
 538         struct ieee80211_channel *channel = conf->channel;
 539         const struct iwl_channel_info *ch_info;
 540         int ret = 0;
 541
 542         IWL_DEBUG_MAC80211(priv, "enter: changed %#x", changed);
 543
 544         mutex_lock(&priv->shrd->mutex);
 545
 546         if (unlikely(test_bit(STATUS_SCANNING, &priv->shrd->status))) {
 547                 IWL_DEBUG_MAC80211(priv, "leave - scanning\n");
 548                 goto out;
 549         }
 550
 551         if (!iwl_is_ready(priv->shrd)) {
 552                 IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
 553                 goto out;
 554         }
 555
 556         if (changed & (IEEE80211_CONF_CHANGE_SMPS |
 557                        IEEE80211_CONF_CHANGE_CHANNEL)) {
 558                 /* mac80211 uses static for non-HT which is what we want */
 559                 priv->current_ht_config.smps = conf->smps_mode;
 560
 561                 /*
 562                  * Recalculate chain counts.
 563                  *
 564                  * If monitor mode is enabled then mac80211 will
 565                  * set up the SM PS mode to OFF if an HT channel is
 566                  * configured.
 567                  */
 568                 for_each_context(priv, ctx)
 569                         iwlagn_set_rxon_chain(priv, ctx);
 570         }
 571
 572         if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
 573                 unsigned long flags;
 574
 575                 ch_info = iwl_get_channel_info(priv, channel->band,
 576                                                channel->hw_value);
 577                 if (!is_channel_valid(ch_info)) {
 578                         IWL_DEBUG_MAC80211(priv, "leave - invalid channel\n");
 579                         ret = -EINVAL;
 580                         goto out;
 581                 }
 582
 583                 spin_lock_irqsave(&priv->shrd->lock, flags);
 584
 585                 for_each_context(priv, ctx) {
 586                         /* Configure HT40 channels */
 587                         if (ctx->ht.enabled != conf_is_ht(conf))
 588                                 ctx->ht.enabled = conf_is_ht(conf);
 589
 590                         if (ctx->ht.enabled) {
 591                                 if (conf_is_ht40_minus(conf)) {
 592                                         ctx->ht.extension_chan_offset =
 593                                                 IEEE80211_HT_PARAM_CHA_SEC_BELOW;
 594                                         ctx->ht.is_40mhz = true;
 595                                 } else if (conf_is_ht40_plus(conf)) {
 596                                         ctx->ht.extension_chan_offset =
 597                                                 IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
 598                                         ctx->ht.is_40mhz = true;
 599                                 } else {
 600                                         ctx->ht.extension_chan_offset =
 601                                                 IEEE80211_HT_PARAM_CHA_SEC_NONE;
 602                                         ctx->ht.is_40mhz = false;
 603                                 }
 604                         } else
 605                                 ctx->ht.is_40mhz = false;
 606
 607                         /*
 608                          * Default to no protection. Protection mode will
 609                          * later be set from BSS config in iwl_ht_conf
 610                          */
 611                         ctx->ht.protection = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
 612
 613                         /* if we are switching from ht to 2.4 clear flags
 614                          * from any ht related info since 2.4 does not
 615                          * support ht */
 616                         if (le16_to_cpu(ctx->staging.channel) !=
 617                             channel->hw_value)
 618                                 ctx->staging.flags = 0;
 619
 620                         iwl_set_rxon_channel(priv, channel, ctx);
 621                         iwl_set_rxon_ht(priv, &priv->current_ht_config);
 622
 623                         iwl_set_flags_for_band(priv, ctx, channel->band,
 624                                                ctx->vif);
 625                 }
 626
 627                 spin_unlock_irqrestore(&priv->shrd->lock, flags);
 628
 629                 iwl_update_bcast_stations(priv);
 630
 631                 /*
 632                  * The list of supported rates and rate mask can be different
 633                  * for each band; since the band may have changed, reset
 634                  * the rate mask to what mac80211 lists.
 635                  */
 636                 iwl_set_rate(priv);
 637         }
 638
 639         if (changed & (IEEE80211_CONF_CHANGE_PS |
 640                         IEEE80211_CONF_CHANGE_IDLE)) {
 641                 ret = iwl_power_update_mode(priv, false);
 642                 if (ret)
 643                         IWL_DEBUG_MAC80211(priv, "Error setting sleep level\n");
 644         }
 645
 646         if (changed & IEEE80211_CONF_CHANGE_POWER) {
 647                 IWL_DEBUG_MAC80211(priv, "TX Power old=%d new=%d\n",
 648                         priv->tx_power_user_lmt, conf->power_level);
 649
 650                 iwl_set_tx_power(priv, conf->power_level, false);
 651         }
 652
 653         for_each_context(priv, ctx) {
 654                 if (!memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
 655                         continue;
 656                 iwlagn_commit_rxon(priv, ctx);
 657         }
 658  out:
 659         mutex_unlock(&priv->shrd->mutex);
 660         IWL_DEBUG_MAC80211(priv, "leave\n");
 661
 662         return ret;
 663 }
 664
 665 static void iwlagn_check_needed_chains(struct iwl_priv *priv,
 666                                        struct iwl_rxon_context *ctx,
 667                                        struct ieee80211_bss_conf *bss_conf)
 668 {
 669         struct ieee80211_vif *vif = ctx->vif;
 670         struct iwl_rxon_context *tmp;
 671         struct ieee80211_sta *sta;
 672         struct iwl_ht_config *ht_conf = &priv->current_ht_config;
 673         struct ieee80211_sta_ht_cap *ht_cap;
 674         bool need_multiple;
 675
 676         lockdep_assert_held(&priv->shrd->mutex);
 677
 678         switch (vif->type) {
 679         case NL80211_IFTYPE_STATION:
 680                 rcu_read_lock();
 681                 sta = ieee80211_find_sta(vif, bss_conf->bssid);
 682                 if (!sta) {
 683                         /*
 684                          * If at all, this can only happen through a race
 685                          * when the AP disconnects us while we're still
 686                          * setting up the connection, in that case mac80211
 687                          * will soon tell us about that.
 688                          */
 689                         need_multiple = false;
 690                         rcu_read_unlock();
 691                         break;
 692                 }
 693
 694                 ht_cap = &sta->ht_cap;
 695
 696                 need_multiple = true;
 697
 698                 /*
 699                  * If the peer advertises no support for receiving 2 and 3
 700                  * stream MCS rates, it can't be transmitting them either.
 701                  */
 702                 if (ht_cap->mcs.rx_mask[1] == 0 &&
 703                     ht_cap->mcs.rx_mask[2] == 0) {
 704                         need_multiple = false;
 705                 } else if (!(ht_cap->mcs.tx_params &
 706                                                 IEEE80211_HT_MCS_TX_DEFINED)) {
 707                         /* If it can't TX MCS at all ... */
 708                         need_multiple = false;
 709                 } else if (ht_cap->mcs.tx_params &
 710                                                 IEEE80211_HT_MCS_TX_RX_DIFF) {
 711                         int maxstreams;
 712
 713                         /*
 714                          * But if it can receive them, it might still not
 715                          * be able to transmit them, which is what we need
 716                          * to check here -- so check the number of streams
 717                          * it advertises for TX (if different from RX).
 718                          */
 719
 720                         maxstreams = (ht_cap->mcs.tx_params &
 721                                  IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK);
 722                         maxstreams >>=
 723                                 IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT;
 724                         maxstreams += 1;
 725
 726                         if (maxstreams <= 1)
 727                                 need_multiple = false;
 728                 }
 729
 730                 rcu_read_unlock();
 731                 break;
 732         case NL80211_IFTYPE_ADHOC:
 733                 /* currently */
 734                 need_multiple = false;
 735                 break;
 736         default:
 737                 /* only AP really */
 738                 need_multiple = true;
 739                 break;
 740         }
 741
 742         ctx->ht_need_multiple_chains = need_multiple;
 743
 744         if (!need_multiple) {
 745                 /* check all contexts */
 746                 for_each_context(priv, tmp) {
 747                         if (!tmp->vif)
 748                                 continue;
 749                         if (tmp->ht_need_multiple_chains) {
 750                                 need_multiple = true;
 751                                 break;
 752                         }
 753                 }
 754         }
 755
 756         ht_conf->single_chain_sufficient = !need_multiple;
 757 }
 758
 759 static void iwlagn_chain_noise_reset(struct iwl_priv *priv)
 760 {
 761         struct iwl_chain_noise_data *data = &priv->chain_noise_data;
 762         int ret;
 763
 764         if ((data->state == IWL_CHAIN_NOISE_ALIVE) &&
 765             iwl_is_any_associated(priv)) {
 766                 struct iwl_calib_chain_noise_reset_cmd cmd;
 767
 768                 /* clear data for chain noise calibration algorithm */
 769                 data->chain_noise_a = 0;
 770                 data->chain_noise_b = 0;
 771                 data->chain_noise_c = 0;
 772                 data->chain_signal_a = 0;
 773                 data->chain_signal_b = 0;
 774                 data->chain_signal_c = 0;
 775                 data->beacon_count = 0;
 776
 777                 memset(&cmd, 0, sizeof(cmd));
 778                 iwl_set_calib_hdr(&cmd.hdr,
 779                         priv->phy_calib_chain_noise_reset_cmd);
 780                 ret = iwl_trans_send_cmd_pdu(trans(priv),
 781                                         REPLY_PHY_CALIBRATION_CMD,
 782                                         CMD_SYNC, sizeof(cmd), &cmd);
 783                 if (ret)
 784                         IWL_ERR(priv,
 785                                 "Could not send REPLY_PHY_CALIBRATION_CMD\n");
 786                 data->state = IWL_CHAIN_NOISE_ACCUMULATE;
 787                 IWL_DEBUG_CALIB(priv, "Run chain_noise_calibrate\n");
 788         }
 789 }
 790
 791 void iwlagn_bss_info_changed(struct ieee80211_hw *hw,
 792                              struct ieee80211_vif *vif,
 793                              struct ieee80211_bss_conf *bss_conf,
 794                              u32 changes)
 795 {
 796         struct iwl_priv *priv = hw->priv;
 797         struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
 798         int ret;
 799         bool force = false;
 800
 801         mutex_lock(&priv->shrd->mutex);
 802
 803         if (unlikely(!iwl_is_ready(priv->shrd))) {
 804                 IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
 805                 mutex_unlock(&priv->shrd->mutex);
 806                 return;
 807         }
 808
 809         if (unlikely(!ctx->vif)) {
 810                 IWL_DEBUG_MAC80211(priv, "leave - vif is NULL\n");
 811                 mutex_unlock(&priv->shrd->mutex);
 812                 return;
 813         }
 814
 815         if (changes & BSS_CHANGED_BEACON_INT)
 816                 force = true;
 817
 818         if (changes & BSS_CHANGED_QOS) {
 819                 ctx->qos_data.qos_active = bss_conf->qos;
 820                 iwlagn_update_qos(priv, ctx);
 821         }
 822
 823         ctx->staging.assoc_id = cpu_to_le16(vif->bss_conf.aid);
 824         if (vif->bss_conf.use_short_preamble)
 825                 ctx->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
 826         else
 827                 ctx->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
 828
 829         if (changes & BSS_CHANGED_ASSOC) {
 830                 if (bss_conf->assoc) {
 831                         priv->timestamp = bss_conf->timestamp;
 832                         ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
 833                 } else {
 834                         /*
 835                          * If we disassociate while there are pending
 836                          * frames, just wake up the queues and let the
 837                          * frames "escape" ... This shouldn't really
 838                          * be happening to start with, but we should
 839                          * not get stuck in this case either since it
 840                          * can happen if userspace gets confused.
 841                          */
 842                         if (ctx->last_tx_rejected) {
 843                                 ctx->last_tx_rejected = false;
 844                                 iwl_trans_wake_any_queue(trans(priv),
 845                                                          ctx->ctxid);
 846                         }
 847                         ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
 848
 849                         if (ctx->ctxid == IWL_RXON_CTX_BSS)
 850                                 priv->have_rekey_data = false;
 851                 }
 852
 853                 iwlagn_bt_coex_rssi_monitor(priv);
 854         }
 855
 856         if (ctx->ht.enabled) {
 857                 ctx->ht.protection = bss_conf->ht_operation_mode &
 858                                         IEEE80211_HT_OP_MODE_PROTECTION;
 859                 ctx->ht.non_gf_sta_present = !!(bss_conf->ht_operation_mode &
 860                                         IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT);
 861                 iwlagn_check_needed_chains(priv, ctx, bss_conf);
 862                 iwl_set_rxon_ht(priv, &priv->current_ht_config);
 863         }
 864
 865         iwlagn_set_rxon_chain(priv, ctx);
 866
 867         if (bss_conf->use_cts_prot && (priv->band != IEEE80211_BAND_5GHZ))
 868                 ctx->staging.flags |= RXON_FLG_TGG_PROTECT_MSK;
 869         else
 870                 ctx->staging.flags &= ~RXON_FLG_TGG_PROTECT_MSK;
 871
 872         if (bss_conf->use_cts_prot)
 873                 ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
 874         else
 875                 ctx->staging.flags &= ~RXON_FLG_SELF_CTS_EN;
 876
 877         memcpy(ctx->staging.bssid_addr, bss_conf->bssid, ETH_ALEN);
 878
 879         if (vif->type == NL80211_IFTYPE_AP ||
 880             vif->type == NL80211_IFTYPE_ADHOC) {
 881                 if (vif->bss_conf.enable_beacon) {
 882                         ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
 883                         priv->beacon_ctx = ctx;
 884                 } else {
 885                         ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
 886                         priv->beacon_ctx = NULL;
 887                 }
 888         }
 889
 890         if (force || memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
 891                 iwlagn_commit_rxon(priv, ctx);
 892
 893         if (changes & BSS_CHANGED_ASSOC && bss_conf->assoc) {
 894                 /*
 895                  * The chain noise calibration will enable PM upon
 896                  * completion. If calibration has already been run
 897                  * then we need to enable power management here.
 898                  */
 899                 if (priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE)
 900                         iwl_power_update_mode(priv, false);
 901
 902                 /* Enable RX differential gain and sensitivity calibrations */
 903                 if (!priv->disable_chain_noise_cal)
 904                         iwlagn_chain_noise_reset(priv);
 905                 priv->start_calib = 1;
 906                 WARN_ON(ctx->preauth_bssid);
 907         }
 908
 909         if (changes & BSS_CHANGED_IBSS) {
 910                 ret = iwlagn_manage_ibss_station(priv, vif,
 911                                                  bss_conf->ibss_joined);
 912                 if (ret)
 913                         IWL_ERR(priv, "failed to %s IBSS station %pM\n",
 914                                 bss_conf->ibss_joined ? "add" : "remove",
 915                                 bss_conf->bssid);
 916         }
 917
 918         if (changes & BSS_CHANGED_BEACON && vif->type == NL80211_IFTYPE_ADHOC &&
 919             priv->beacon_ctx) {
 920                 if (iwlagn_update_beacon(priv, vif))
 921                         IWL_ERR(priv, "Error sending IBSS beacon\n");
 922         }
 923
 924         mutex_unlock(&priv->shrd->mutex);
 925 }
 926
 927 void iwlagn_post_scan(struct iwl_priv *priv)
 928 {
 929         struct iwl_rxon_context *ctx;
 930
 931         /*
 932          * We do not commit power settings while scan is pending,
 933          * do it now if the settings changed.
 934          */
 935         iwl_power_set_mode(priv, &priv->power_data.sleep_cmd_next, false);
 936         iwl_set_tx_power(priv, priv->tx_power_next, false);
 937
 938         /*
 939          * Since setting the RXON may have been deferred while
 940          * performing the scan, fire one off if needed
 941          */
 942         for_each_context(priv, ctx)
 943                 if (memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
 944                         iwlagn_commit_rxon(priv, ctx);
 945
 946         iwlagn_set_pan_params(priv);
 947 }