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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2012 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-core.h"
  30 #include "iwl-agn-calib.h"
  31 #include "iwl-trans.h"
  32 #include "iwl-shared.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_dvm_send_cmd_pdu(priv, ctx->rxon_cmd,
  43                                 CMD_SYNC, sizeof(*send), send);
  44
  45         send->filter_flags = old_filter;
  46
  47         if (ret)
  48                 IWL_DEBUG_QUIET_RFKILL(priv,
  49                         "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         iwl_init_notification_wait(priv->shrd, &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 = iwl_dvm_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                 iwl_remove_notification(priv->shrd, &disable_wait);
  78         } else {
  79                 ret = iwl_wait_notification(priv->shrd, &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 = iwl_dvm_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_INFO(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 = iwl_dvm_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_DEBUG_QUIET_RFKILL(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 = iwl_dvm_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 = iwl_dvm_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         /* IBSS beacon needs to be sent after setting assoc */
 278         if (ctx->vif && (ctx->vif->type == NL80211_IFTYPE_ADHOC))
 279                 if (iwlagn_update_beacon(priv, ctx->vif))
 280                         IWL_ERR(priv, "Error sending IBSS beacon\n");
 281         iwl_init_sensitivity(priv);
 282
 283         /*
 284          * If we issue a new RXON command which required a tune then
 285          * we must send a new TXPOWER command or we won't be able to
 286          * Tx any frames.
 287          *
 288          * It's expected we set power here if channel is changing.
 289          */
 290         ret = iwl_set_tx_power(priv, priv->tx_power_next, true);
 291         if (ret) {
 292                 IWL_ERR(priv, "Error sending TX power (%d)\n", ret);
 293                 return ret;
 294         }
 295
 296         if (ctx->vif && ctx->vif->type == NL80211_IFTYPE_STATION &&
 297             cfg(priv)->ht_params && cfg(priv)->ht_params->smps_mode)
 298                 ieee80211_request_smps(ctx->vif,
 299                                        cfg(priv)->ht_params->smps_mode);
 300
 301         return 0;
 302 }
 303
 304 int iwlagn_set_pan_params(struct iwl_priv *priv)
 305 {
 306         struct iwl_wipan_params_cmd cmd;
 307         struct iwl_rxon_context *ctx_bss, *ctx_pan;
 308         int slot0 = 300, slot1 = 0;
 309         int ret;
 310
 311         if (priv->shrd->valid_contexts == BIT(IWL_RXON_CTX_BSS))
 312                 return 0;
 313
 314         BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
 315
 316         lockdep_assert_held(&priv->mutex);
 317
 318         ctx_bss = &priv->contexts[IWL_RXON_CTX_BSS];
 319         ctx_pan = &priv->contexts[IWL_RXON_CTX_PAN];
 320
 321         /*
 322          * If the PAN context is inactive, then we don't need
 323          * to update the PAN parameters, the last thing we'll
 324          * have done before it goes inactive is making the PAN
 325          * parameters be WLAN-only.
 326          */
 327         if (!ctx_pan->is_active)
 328                 return 0;
 329
 330         memset(&cmd, 0, sizeof(cmd));
 331
 332         /* only 2 slots are currently allowed */
 333         cmd.num_slots = 2;
 334
 335         cmd.slots[0].type = 0; /* BSS */
 336         cmd.slots[1].type = 1; /* PAN */
 337
 338         if (priv->hw_roc_setup) {
 339                 /* both contexts must be used for this to happen */
 340                 slot1 = IWL_MIN_SLOT_TIME;
 341                 slot0 = 3000;
 342         } else if (ctx_bss->vif && ctx_pan->vif) {
 343                 int bcnint = ctx_pan->beacon_int;
 344                 int dtim = ctx_pan->vif->bss_conf.dtim_period ?: 1;
 345
 346                 /* should be set, but seems unused?? */
 347                 cmd.flags |= cpu_to_le16(IWL_WIPAN_PARAMS_FLG_SLOTTED_MODE);
 348
 349                 if (ctx_pan->vif->type == NL80211_IFTYPE_AP &&
 350                     bcnint &&
 351                     bcnint != ctx_bss->beacon_int) {
 352                         IWL_ERR(priv,
 353                                 "beacon intervals don't match (%d, %d)\n",
 354                                 ctx_bss->beacon_int, ctx_pan->beacon_int);
 355                 } else
 356                         bcnint = max_t(int, bcnint,
 357                                        ctx_bss->beacon_int);
 358                 if (!bcnint)
 359                         bcnint = DEFAULT_BEACON_INTERVAL;
 360                 slot0 = bcnint / 2;
 361                 slot1 = bcnint - slot0;
 362
 363                 if (test_bit(STATUS_SCAN_HW, &priv->shrd->status) ||
 364                     (!ctx_bss->vif->bss_conf.idle &&
 365                      !ctx_bss->vif->bss_conf.assoc)) {
 366                         slot0 = dtim * bcnint * 3 - IWL_MIN_SLOT_TIME;
 367                         slot1 = IWL_MIN_SLOT_TIME;
 368                 } else if (!ctx_pan->vif->bss_conf.idle &&
 369                            !ctx_pan->vif->bss_conf.assoc) {
 370                         slot1 = dtim * bcnint * 3 - IWL_MIN_SLOT_TIME;
 371                         slot0 = IWL_MIN_SLOT_TIME;
 372                 }
 373         } else if (ctx_pan->vif) {
 374                 slot0 = 0;
 375                 slot1 = max_t(int, 1, ctx_pan->vif->bss_conf.dtim_period) *
 376                                         ctx_pan->beacon_int;
 377                 slot1 = max_t(int, DEFAULT_BEACON_INTERVAL, slot1);
 378
 379                 if (test_bit(STATUS_SCAN_HW, &priv->shrd->status)) {
 380                         slot0 = slot1 * 3 - IWL_MIN_SLOT_TIME;
 381                         slot1 = IWL_MIN_SLOT_TIME;
 382                 }
 383         }
 384
 385         cmd.slots[0].width = cpu_to_le16(slot0);
 386         cmd.slots[1].width = cpu_to_le16(slot1);
 387
 388         ret = iwl_dvm_send_cmd_pdu(priv, REPLY_WIPAN_PARAMS, CMD_SYNC,
 389                         sizeof(cmd), &cmd);
 390         if (ret)
 391                 IWL_ERR(priv, "Error setting PAN parameters (%d)\n", ret);
 392
 393         return ret;
 394 }
 395
 396 /**
 397  * iwlagn_commit_rxon - commit staging_rxon to hardware
 398  *
 399  * The RXON command in staging_rxon is committed to the hardware and
 400  * the active_rxon structure is updated with the new data.  This
 401  * function correctly transitions out of the RXON_ASSOC_MSK state if
 402  * a HW tune is required based on the RXON structure changes.
 403  *
 404  * The connect/disconnect flow should be as the following:
 405  *
 406  * 1. make sure send RXON command with association bit unset if not connect
 407  *      this should include the channel and the band for the candidate
 408  *      to be connected to
 409  * 2. Add Station before RXON association with the AP
 410  * 3. RXON_timing has to send before RXON for connection
 411  * 4. full RXON command - associated bit set
 412  * 5. use RXON_ASSOC command to update any flags changes
 413  */
 414 int iwlagn_commit_rxon(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 415 {
 416         /* cast away the const for active_rxon in this function */
 417         struct iwl_rxon_cmd *active = (void *)&ctx->active;
 418         bool new_assoc = !!(ctx->staging.filter_flags & RXON_FILTER_ASSOC_MSK);
 419         int ret;
 420
 421         lockdep_assert_held(&priv->mutex);
 422
 423         if (!iwl_is_alive(priv->shrd))
 424                 return -EBUSY;
 425
 426         /* This function hardcodes a bunch of dual-mode assumptions */
 427         BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
 428
 429         if (!ctx->is_active)
 430                 return 0;
 431
 432         /* always get timestamp with Rx frame */
 433         ctx->staging.flags |= RXON_FLG_TSF2HOST_MSK;
 434
 435         /*
 436          * force CTS-to-self frames protection if RTS-CTS is not preferred
 437          * one aggregation protection method
 438          */
 439         if (!hw_params(priv).use_rts_for_aggregation)
 440                 ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
 441
 442         if ((ctx->vif && ctx->vif->bss_conf.use_short_slot) ||
 443             !(ctx->staging.flags & RXON_FLG_BAND_24G_MSK))
 444                 ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
 445         else
 446                 ctx->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;
 447
 448         iwl_print_rx_config_cmd(priv, ctx->ctxid);
 449         ret = iwl_check_rxon_cmd(priv, ctx);
 450         if (ret) {
 451                 IWL_ERR(priv, "Invalid RXON configuration. Not committing.\n");
 452                 return -EINVAL;
 453         }
 454
 455         /*
 456          * receive commit_rxon request
 457          * abort any previous channel switch if still in process
 458          */
 459         if (test_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->shrd->status) &&
 460             (priv->switch_channel != ctx->staging.channel)) {
 461                 IWL_DEBUG_11H(priv, "abort channel switch on %d\n",
 462                               le16_to_cpu(priv->switch_channel));
 463                 iwl_chswitch_done(priv, false);
 464         }
 465
 466         /*
 467          * If we don't need to send a full RXON, we can use
 468          * iwl_rxon_assoc_cmd which is used to reconfigure filter
 469          * and other flags for the current radio configuration.
 470          */
 471         if (!iwl_full_rxon_required(priv, ctx)) {
 472                 ret = iwlagn_send_rxon_assoc(priv, ctx);
 473                 if (ret) {
 474                         IWL_ERR(priv, "Error setting RXON_ASSOC (%d)\n", ret);
 475                         return ret;
 476                 }
 477
 478                 memcpy(active, &ctx->staging, sizeof(*active));
 479                 /*
 480                  * We do not commit tx power settings while channel changing,
 481                  * do it now if after settings changed.
 482                  */
 483                 iwl_set_tx_power(priv, priv->tx_power_next, false);
 484
 485                 /* make sure we are in the right PS state */
 486                 iwl_power_update_mode(priv, true);
 487
 488                 return 0;
 489         }
 490
 491         iwl_set_rxon_hwcrypto(priv, ctx, !iwlagn_mod_params.sw_crypto);
 492
 493         IWL_DEBUG_INFO(priv,
 494                        "Going to commit RXON\n"
 495                        "  * with%s RXON_FILTER_ASSOC_MSK\n"
 496                        "  * channel = %d\n"
 497                        "  * bssid = %pM\n",
 498                        (new_assoc ? "" : "out"),
 499                        le16_to_cpu(ctx->staging.channel),
 500                        ctx->staging.bssid_addr);
 501
 502         /*
 503          * Always clear associated first, but with the correct config.
 504          * This is required as for example station addition for the
 505          * AP station must be done after the BSSID is set to correctly
 506          * set up filters in the device.
 507          */
 508         ret = iwlagn_rxon_disconn(priv, ctx);
 509         if (ret)
 510                 return ret;
 511
 512         ret = iwlagn_set_pan_params(priv);
 513         if (ret)
 514                 return ret;
 515
 516         if (new_assoc)
 517                 return iwlagn_rxon_connect(priv, ctx);
 518
 519         return 0;
 520 }
 521
 522 void iwlagn_config_ht40(struct ieee80211_conf *conf,
 523         struct iwl_rxon_context *ctx)
 524 {
 525         if (conf_is_ht40_minus(conf)) {
 526                 ctx->ht.extension_chan_offset =
 527                         IEEE80211_HT_PARAM_CHA_SEC_BELOW;
 528                 ctx->ht.is_40mhz = true;
 529         } else if (conf_is_ht40_plus(conf)) {
 530                 ctx->ht.extension_chan_offset =
 531                         IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
 532                 ctx->ht.is_40mhz = true;
 533         } else {
 534                 ctx->ht.extension_chan_offset =
 535                         IEEE80211_HT_PARAM_CHA_SEC_NONE;
 536                 ctx->ht.is_40mhz = false;
 537         }
 538 }
 539
 540 int iwlagn_mac_config(struct ieee80211_hw *hw, u32 changed)
 541 {
 542         struct iwl_priv *priv = IWL_MAC80211_GET_DVM(hw);
 543         struct iwl_rxon_context *ctx;
 544         struct ieee80211_conf *conf = &hw->conf;
 545         struct ieee80211_channel *channel = conf->channel;
 546         const struct iwl_channel_info *ch_info;
 547         int ret = 0;
 548
 549         IWL_DEBUG_MAC80211(priv, "enter: changed %#x", changed);
 550
 551         mutex_lock(&priv->mutex);
 552
 553         if (unlikely(test_bit(STATUS_SCANNING, &priv->shrd->status))) {
 554                 IWL_DEBUG_MAC80211(priv, "leave - scanning\n");
 555                 goto out;
 556         }
 557
 558         if (!iwl_is_ready(priv->shrd)) {
 559                 IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
 560                 goto out;
 561         }
 562
 563         if (changed & (IEEE80211_CONF_CHANGE_SMPS |
 564                        IEEE80211_CONF_CHANGE_CHANNEL)) {
 565                 /* mac80211 uses static for non-HT which is what we want */
 566                 priv->current_ht_config.smps = conf->smps_mode;
 567
 568                 /*
 569                  * Recalculate chain counts.
 570                  *
 571                  * If monitor mode is enabled then mac80211 will
 572                  * set up the SM PS mode to OFF if an HT channel is
 573                  * configured.
 574                  */
 575                 for_each_context(priv, ctx)
 576                         iwlagn_set_rxon_chain(priv, ctx);
 577         }
 578
 579         if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
 580                 ch_info = iwl_get_channel_info(priv, channel->band,
 581                                                channel->hw_value);
 582                 if (!is_channel_valid(ch_info)) {
 583                         IWL_DEBUG_MAC80211(priv, "leave - invalid channel\n");
 584                         ret = -EINVAL;
 585                         goto out;
 586                 }
 587
 588                 for_each_context(priv, ctx) {
 589                         /* Configure HT40 channels */
 590                         if (ctx->ht.enabled != conf_is_ht(conf))
 591                                 ctx->ht.enabled = conf_is_ht(conf);
 592
 593                         if (ctx->ht.enabled) {
 594                                 /* if HT40 is used, it should not change
 595                                  * after associated except channel switch */
 596                                 if (!ctx->ht.is_40mhz ||
 597                                                 !iwl_is_associated_ctx(ctx))
 598                                         iwlagn_config_ht40(conf, ctx);
 599                         } else
 600                                 ctx->ht.is_40mhz = false;
 601
 602                         /*
 603                          * Default to no protection. Protection mode will
 604                          * later be set from BSS config in iwl_ht_conf
 605                          */
 606                         ctx->ht.protection = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
 607
 608                         /* if we are switching from ht to 2.4 clear flags
 609                          * from any ht related info since 2.4 does not
 610                          * support ht */
 611                         if (le16_to_cpu(ctx->staging.channel) !=
 612                             channel->hw_value)
 613                                 ctx->staging.flags = 0;
 614
 615                         iwl_set_rxon_channel(priv, channel, ctx);
 616                         iwl_set_rxon_ht(priv, &priv->current_ht_config);
 617
 618                         iwl_set_flags_for_band(priv, ctx, channel->band,
 619                                                ctx->vif);
 620                 }
 621
 622                 iwl_update_bcast_stations(priv);
 623
 624                 /*
 625                  * The list of supported rates and rate mask can be different
 626                  * for each band; since the band may have changed, reset
 627                  * the rate mask to what mac80211 lists.
 628                  */
 629                 iwl_set_rate(priv);
 630         }
 631
 632         if (changed & (IEEE80211_CONF_CHANGE_PS |
 633                         IEEE80211_CONF_CHANGE_IDLE)) {
 634                 ret = iwl_power_update_mode(priv, false);
 635                 if (ret)
 636                         IWL_DEBUG_MAC80211(priv, "Error setting sleep level\n");
 637         }
 638
 639         if (changed & IEEE80211_CONF_CHANGE_POWER) {
 640                 IWL_DEBUG_MAC80211(priv, "TX Power old=%d new=%d\n",
 641                         priv->tx_power_user_lmt, conf->power_level);
 642
 643                 iwl_set_tx_power(priv, conf->power_level, false);
 644         }
 645
 646         for_each_context(priv, ctx) {
 647                 if (!memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
 648                         continue;
 649                 iwlagn_commit_rxon(priv, ctx);
 650         }
 651  out:
 652         mutex_unlock(&priv->mutex);
 653         IWL_DEBUG_MAC80211(priv, "leave\n");
 654
 655         return ret;
 656 }
 657
 658 static void iwlagn_check_needed_chains(struct iwl_priv *priv,
 659                                        struct iwl_rxon_context *ctx,
 660                                        struct ieee80211_bss_conf *bss_conf)
 661 {
 662         struct ieee80211_vif *vif = ctx->vif;
 663         struct iwl_rxon_context *tmp;
 664         struct ieee80211_sta *sta;
 665         struct iwl_ht_config *ht_conf = &priv->current_ht_config;
 666         struct ieee80211_sta_ht_cap *ht_cap;
 667         bool need_multiple;
 668
 669         lockdep_assert_held(&priv->mutex);
 670
 671         switch (vif->type) {
 672         case NL80211_IFTYPE_STATION:
 673                 rcu_read_lock();
 674                 sta = ieee80211_find_sta(vif, bss_conf->bssid);
 675                 if (!sta) {
 676                         /*
 677                          * If at all, this can only happen through a race
 678                          * when the AP disconnects us while we're still
 679                          * setting up the connection, in that case mac80211
 680                          * will soon tell us about that.
 681                          */
 682                         need_multiple = false;
 683                         rcu_read_unlock();
 684                         break;
 685                 }
 686
 687                 ht_cap = &sta->ht_cap;
 688
 689                 need_multiple = true;
 690
 691                 /*
 692                  * If the peer advertises no support for receiving 2 and 3
 693                  * stream MCS rates, it can't be transmitting them either.
 694                  */
 695                 if (ht_cap->mcs.rx_mask[1] == 0 &&
 696                     ht_cap->mcs.rx_mask[2] == 0) {
 697                         need_multiple = false;
 698                 } else if (!(ht_cap->mcs.tx_params &
 699                                                 IEEE80211_HT_MCS_TX_DEFINED)) {
 700                         /* If it can't TX MCS at all ... */
 701                         need_multiple = false;
 702                 } else if (ht_cap->mcs.tx_params &
 703                                                 IEEE80211_HT_MCS_TX_RX_DIFF) {
 704                         int maxstreams;
 705
 706                         /*
 707                          * But if it can receive them, it might still not
 708                          * be able to transmit them, which is what we need
 709                          * to check here -- so check the number of streams
 710                          * it advertises for TX (if different from RX).
 711                          */
 712
 713                         maxstreams = (ht_cap->mcs.tx_params &
 714                                  IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK);
 715                         maxstreams >>=
 716                                 IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT;
 717                         maxstreams += 1;
 718
 719                         if (maxstreams <= 1)
 720                                 need_multiple = false;
 721                 }
 722
 723                 rcu_read_unlock();
 724                 break;
 725         case NL80211_IFTYPE_ADHOC:
 726                 /* currently */
 727                 need_multiple = false;
 728                 break;
 729         default:
 730                 /* only AP really */
 731                 need_multiple = true;
 732                 break;
 733         }
 734
 735         ctx->ht_need_multiple_chains = need_multiple;
 736
 737         if (!need_multiple) {
 738                 /* check all contexts */
 739                 for_each_context(priv, tmp) {
 740                         if (!tmp->vif)
 741                                 continue;
 742                         if (tmp->ht_need_multiple_chains) {
 743                                 need_multiple = true;
 744                                 break;
 745                         }
 746                 }
 747         }
 748
 749         ht_conf->single_chain_sufficient = !need_multiple;
 750 }
 751
 752 static void iwlagn_chain_noise_reset(struct iwl_priv *priv)
 753 {
 754         struct iwl_chain_noise_data *data = &priv->chain_noise_data;
 755         int ret;
 756
 757         if ((data->state == IWL_CHAIN_NOISE_ALIVE) &&
 758             iwl_is_any_associated(priv)) {
 759                 struct iwl_calib_chain_noise_reset_cmd cmd;
 760
 761                 /* clear data for chain noise calibration algorithm */
 762                 data->chain_noise_a = 0;
 763                 data->chain_noise_b = 0;
 764                 data->chain_noise_c = 0;
 765                 data->chain_signal_a = 0;
 766                 data->chain_signal_b = 0;
 767                 data->chain_signal_c = 0;
 768                 data->beacon_count = 0;
 769
 770                 memset(&cmd, 0, sizeof(cmd));
 771                 iwl_set_calib_hdr(&cmd.hdr,
 772                         priv->phy_calib_chain_noise_reset_cmd);
 773                 ret = iwl_dvm_send_cmd_pdu(priv,
 774                                         REPLY_PHY_CALIBRATION_CMD,
 775                                         CMD_SYNC, sizeof(cmd), &cmd);
 776                 if (ret)
 777                         IWL_ERR(priv,
 778                                 "Could not send REPLY_PHY_CALIBRATION_CMD\n");
 779                 data->state = IWL_CHAIN_NOISE_ACCUMULATE;
 780                 IWL_DEBUG_CALIB(priv, "Run chain_noise_calibrate\n");
 781         }
 782 }
 783
 784 void iwlagn_bss_info_changed(struct ieee80211_hw *hw,
 785                              struct ieee80211_vif *vif,
 786                              struct ieee80211_bss_conf *bss_conf,
 787                              u32 changes)
 788 {
 789         struct iwl_priv *priv = IWL_MAC80211_GET_DVM(hw);
 790         struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
 791         int ret;
 792         bool force = false;
 793
 794         mutex_lock(&priv->mutex);
 795
 796         if (unlikely(!iwl_is_ready(priv->shrd))) {
 797                 IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
 798                 mutex_unlock(&priv->mutex);
 799                 return;
 800         }
 801
 802         if (unlikely(!ctx->vif)) {
 803                 IWL_DEBUG_MAC80211(priv, "leave - vif is NULL\n");
 804                 mutex_unlock(&priv->mutex);
 805                 return;
 806         }
 807
 808         if (changes & BSS_CHANGED_BEACON_INT)
 809                 force = true;
 810
 811         if (changes & BSS_CHANGED_QOS) {
 812                 ctx->qos_data.qos_active = bss_conf->qos;
 813                 iwlagn_update_qos(priv, ctx);
 814         }
 815
 816         ctx->staging.assoc_id = cpu_to_le16(vif->bss_conf.aid);
 817         if (vif->bss_conf.use_short_preamble)
 818                 ctx->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
 819         else
 820                 ctx->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
 821
 822         if (changes & BSS_CHANGED_ASSOC) {
 823                 if (bss_conf->assoc) {
 824                         priv->timestamp = bss_conf->timestamp;
 825                         ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
 826                 } else {
 827                         /*
 828                          * If we disassociate while there are pending
 829                          * frames, just wake up the queues and let the
 830                          * frames "escape" ... This shouldn't really
 831                          * be happening to start with, but we should
 832                          * not get stuck in this case either since it
 833                          * can happen if userspace gets confused.
 834                          */
 835                         if (ctx->last_tx_rejected) {
 836                                 ctx->last_tx_rejected = false;
 837                                 iwl_trans_wake_any_queue(trans(priv),
 838                                                          ctx->ctxid,
 839                                                          "Disassoc: flush queue");
 840                         }
 841                         ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
 842
 843                         if (ctx->ctxid == IWL_RXON_CTX_BSS)
 844                                 priv->have_rekey_data = false;
 845                 }
 846
 847                 iwlagn_bt_coex_rssi_monitor(priv);
 848         }
 849
 850         if (ctx->ht.enabled) {
 851                 ctx->ht.protection = bss_conf->ht_operation_mode &
 852                                         IEEE80211_HT_OP_MODE_PROTECTION;
 853                 ctx->ht.non_gf_sta_present = !!(bss_conf->ht_operation_mode &
 854                                         IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT);
 855                 iwlagn_check_needed_chains(priv, ctx, bss_conf);
 856                 iwl_set_rxon_ht(priv, &priv->current_ht_config);
 857         }
 858
 859         iwlagn_set_rxon_chain(priv, ctx);
 860
 861         if (bss_conf->use_cts_prot && (priv->band != IEEE80211_BAND_5GHZ))
 862                 ctx->staging.flags |= RXON_FLG_TGG_PROTECT_MSK;
 863         else
 864                 ctx->staging.flags &= ~RXON_FLG_TGG_PROTECT_MSK;
 865
 866         if (bss_conf->use_cts_prot)
 867                 ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
 868         else
 869                 ctx->staging.flags &= ~RXON_FLG_SELF_CTS_EN;
 870
 871         memcpy(ctx->staging.bssid_addr, bss_conf->bssid, ETH_ALEN);
 872
 873         if (vif->type == NL80211_IFTYPE_AP ||
 874             vif->type == NL80211_IFTYPE_ADHOC) {
 875                 if (vif->bss_conf.enable_beacon) {
 876                         ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
 877                         priv->beacon_ctx = ctx;
 878                 } else {
 879                         ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
 880                         priv->beacon_ctx = NULL;
 881                 }
 882         }
 883
 884         /*
 885          * If the ucode decides to do beacon filtering before
 886          * association, it will lose beacons that are needed
 887          * before sending frames out on passive channels. This
 888          * causes association failures on those channels. Enable
 889          * receiving beacons in such cases.
 890          */
 891
 892         if (vif->type == NL80211_IFTYPE_STATION) {
 893                 if (!bss_conf->assoc)
 894                         ctx->staging.filter_flags |= RXON_FILTER_BCON_AWARE_MSK;
 895                 else
 896                         ctx->staging.filter_flags &=
 897                                                     ~RXON_FILTER_BCON_AWARE_MSK;
 898         }
 899
 900         if (force || memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
 901                 iwlagn_commit_rxon(priv, ctx);
 902
 903         if (changes & BSS_CHANGED_ASSOC && bss_conf->assoc) {
 904                 /*
 905                  * The chain noise calibration will enable PM upon
 906                  * completion. If calibration has already been run
 907                  * then we need to enable power management here.
 908                  */
 909                 if (priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE)
 910                         iwl_power_update_mode(priv, false);
 911
 912                 /* Enable RX differential gain and sensitivity calibrations */
 913                 if (!priv->disable_chain_noise_cal)
 914                         iwlagn_chain_noise_reset(priv);
 915                 priv->start_calib = 1;
 916         }
 917
 918         if (changes & BSS_CHANGED_IBSS) {
 919                 ret = iwlagn_manage_ibss_station(priv, vif,
 920                                                  bss_conf->ibss_joined);
 921                 if (ret)
 922                         IWL_ERR(priv, "failed to %s IBSS station %pM\n",
 923                                 bss_conf->ibss_joined ? "add" : "remove",
 924                                 bss_conf->bssid);
 925         }
 926
 927         if (changes & BSS_CHANGED_BEACON && vif->type == NL80211_IFTYPE_ADHOC &&
 928             priv->beacon_ctx) {
 929                 if (iwlagn_update_beacon(priv, vif))
 930                         IWL_ERR(priv, "Error sending IBSS beacon\n");
 931         }
 932
 933         mutex_unlock(&priv->mutex);
 934 }
 935
 936 void iwlagn_post_scan(struct iwl_priv *priv)
 937 {
 938         struct iwl_rxon_context *ctx;
 939
 940         /*
 941          * We do not commit power settings while scan is pending,
 942          * do it now if the settings changed.
 943          */
 944         iwl_power_set_mode(priv, &priv->power_data.sleep_cmd_next, false);
 945         iwl_set_tx_power(priv, priv->tx_power_next, false);
 946
 947         /*
 948          * Since setting the RXON may have been deferred while
 949          * performing the scan, fire one off if needed
 950          */
 951         for_each_context(priv, ctx)
 952                 if (memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
 953                         iwlagn_commit_rxon(priv, ctx);
 954
 955         iwlagn_set_pan_params(priv);
 956 }