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_trans_send_cmd_pdu(trans(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_trans_send_cmd_pdu(trans(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_trans_send_cmd_pdu(trans(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_trans_send_cmd_pdu(trans(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->shrd->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_trans_send_cmd_pdu(trans(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_trans_send_cmd_pdu(trans(priv), ctx->rxon_cmd, CMD_SYNC,
 270                       sizeof(struct iwl_rxon_cmd), &ctx->staging);
 271         if (ret) {
 272                 IWL_ERR(priv, "Error setting new RXON (%d)\n", ret);
 273                 return ret;
 274         }
 275         memcpy(active, &ctx->staging, sizeof(*active));
 276
 277         iwl_reprogram_ap_sta(priv, ctx);
 278
 279         /* IBSS beacon needs to be sent after setting assoc */
 280         if (ctx->vif && (ctx->vif->type == NL80211_IFTYPE_ADHOC))
 281                 if (iwlagn_update_beacon(priv, ctx->vif))
 282                         IWL_ERR(priv, "Error sending IBSS beacon\n");
 283         iwl_init_sensitivity(priv);
 284
 285         /*
 286          * If we issue a new RXON command which required a tune then
 287          * we must send a new TXPOWER command or we won't be able to
 288          * Tx any frames.
 289          *
 290          * It's expected we set power here if channel is changing.
 291          */
 292         ret = iwl_set_tx_power(priv, priv->tx_power_next, true);
 293         if (ret) {
 294                 IWL_ERR(priv, "Error sending TX power (%d)\n", ret);
 295                 return ret;
 296         }
 297
 298         if (ctx->vif && ctx->vif->type == NL80211_IFTYPE_STATION &&
 299             cfg(priv)->ht_params && cfg(priv)->ht_params->smps_mode)
 300                 ieee80211_request_smps(ctx->vif,
 301                                        cfg(priv)->ht_params->smps_mode);
 302
 303         return 0;
 304 }
 305
 306 int iwlagn_set_pan_params(struct iwl_priv *priv)
 307 {
 308         struct iwl_wipan_params_cmd cmd;
 309         struct iwl_rxon_context *ctx_bss, *ctx_pan;
 310         int slot0 = 300, slot1 = 0;
 311         int ret;
 312
 313         if (priv->shrd->valid_contexts == BIT(IWL_RXON_CTX_BSS))
 314                 return 0;
 315
 316         BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
 317
 318         lockdep_assert_held(&priv->shrd->mutex);
 319
 320         ctx_bss = &priv->contexts[IWL_RXON_CTX_BSS];
 321         ctx_pan = &priv->contexts[IWL_RXON_CTX_PAN];
 322
 323         /*
 324          * If the PAN context is inactive, then we don't need
 325          * to update the PAN parameters, the last thing we'll
 326          * have done before it goes inactive is making the PAN
 327          * parameters be WLAN-only.
 328          */
 329         if (!ctx_pan->is_active)
 330                 return 0;
 331
 332         memset(&cmd, 0, sizeof(cmd));
 333
 334         /* only 2 slots are currently allowed */
 335         cmd.num_slots = 2;
 336
 337         cmd.slots[0].type = 0; /* BSS */
 338         cmd.slots[1].type = 1; /* PAN */
 339
 340         if (priv->hw_roc_setup) {
 341                 /* both contexts must be used for this to happen */
 342                 slot1 = IWL_MIN_SLOT_TIME;
 343                 slot0 = 3000;
 344         } else if (ctx_bss->vif && ctx_pan->vif) {
 345                 int bcnint = ctx_pan->beacon_int;
 346                 int dtim = ctx_pan->vif->bss_conf.dtim_period ?: 1;
 347
 348                 /* should be set, but seems unused?? */
 349                 cmd.flags |= cpu_to_le16(IWL_WIPAN_PARAMS_FLG_SLOTTED_MODE);
 350
 351                 if (ctx_pan->vif->type == NL80211_IFTYPE_AP &&
 352                     bcnint &&
 353                     bcnint != ctx_bss->beacon_int) {
 354                         IWL_ERR(priv,
 355                                 "beacon intervals don't match (%d, %d)\n",
 356                                 ctx_bss->beacon_int, ctx_pan->beacon_int);
 357                 } else
 358                         bcnint = max_t(int, bcnint,
 359                                        ctx_bss->beacon_int);
 360                 if (!bcnint)
 361                         bcnint = DEFAULT_BEACON_INTERVAL;
 362                 slot0 = bcnint / 2;
 363                 slot1 = bcnint - slot0;
 364
 365                 if (test_bit(STATUS_SCAN_HW, &priv->shrd->status) ||
 366                     (!ctx_bss->vif->bss_conf.idle &&
 367                      !ctx_bss->vif->bss_conf.assoc)) {
 368                         slot0 = dtim * bcnint * 3 - IWL_MIN_SLOT_TIME;
 369                         slot1 = IWL_MIN_SLOT_TIME;
 370                 } else if (!ctx_pan->vif->bss_conf.idle &&
 371                            !ctx_pan->vif->bss_conf.assoc) {
 372                         slot1 = dtim * bcnint * 3 - IWL_MIN_SLOT_TIME;
 373                         slot0 = IWL_MIN_SLOT_TIME;
 374                 }
 375         } else if (ctx_pan->vif) {
 376                 slot0 = 0;
 377                 slot1 = max_t(int, 1, ctx_pan->vif->bss_conf.dtim_period) *
 378                                         ctx_pan->beacon_int;
 379                 slot1 = max_t(int, DEFAULT_BEACON_INTERVAL, slot1);
 380
 381                 if (test_bit(STATUS_SCAN_HW, &priv->shrd->status)) {
 382                         slot0 = slot1 * 3 - IWL_MIN_SLOT_TIME;
 383                         slot1 = IWL_MIN_SLOT_TIME;
 384                 }
 385         }
 386
 387         cmd.slots[0].width = cpu_to_le16(slot0);
 388         cmd.slots[1].width = cpu_to_le16(slot1);
 389
 390         ret = iwl_trans_send_cmd_pdu(trans(priv), REPLY_WIPAN_PARAMS, CMD_SYNC,
 391                         sizeof(cmd), &cmd);
 392         if (ret)
 393                 IWL_ERR(priv, "Error setting PAN parameters (%d)\n", ret);
 394
 395         return ret;
 396 }
 397
 398 /**
 399  * iwlagn_commit_rxon - commit staging_rxon to hardware
 400  *
 401  * The RXON command in staging_rxon is committed to the hardware and
 402  * the active_rxon structure is updated with the new data.  This
 403  * function correctly transitions out of the RXON_ASSOC_MSK state if
 404  * a HW tune is required based on the RXON structure changes.
 405  *
 406  * The connect/disconnect flow should be as the following:
 407  *
 408  * 1. make sure send RXON command with association bit unset if not connect
 409  *      this should include the channel and the band for the candidate
 410  *      to be connected to
 411  * 2. Add Station before RXON association with the AP
 412  * 3. RXON_timing has to send before RXON for connection
 413  * 4. full RXON command - associated bit set
 414  * 5. use RXON_ASSOC command to update any flags changes
 415  */
 416 int iwlagn_commit_rxon(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 417 {
 418         /* cast away the const for active_rxon in this function */
 419         struct iwl_rxon_cmd *active = (void *)&ctx->active;
 420         bool new_assoc = !!(ctx->staging.filter_flags & RXON_FILTER_ASSOC_MSK);
 421         int ret;
 422
 423         lockdep_assert_held(&priv->shrd->mutex);
 424
 425         if (test_bit(STATUS_EXIT_PENDING, &priv->shrd->status))
 426                 return -EINVAL;
 427
 428         if (!iwl_is_alive(priv->shrd))
 429                 return -EBUSY;
 430
 431         /* This function hardcodes a bunch of dual-mode assumptions */
 432         BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
 433
 434         if (!ctx->is_active)
 435                 return 0;
 436
 437         /* override BSSID if necessary due to preauth */
 438         if (ctx->preauth_bssid)
 439                 memcpy(ctx->staging.bssid_addr, ctx->bssid, ETH_ALEN);
 440
 441         /* always get timestamp with Rx frame */
 442         ctx->staging.flags |= RXON_FLG_TSF2HOST_MSK;
 443
 444         /*
 445          * force CTS-to-self frames protection if RTS-CTS is not preferred
 446          * one aggregation protection method
 447          */
 448         if (!(cfg(priv)->ht_params &&
 449               cfg(priv)->ht_params->use_rts_for_aggregation))
 450                 ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
 451
 452         if ((ctx->vif && ctx->vif->bss_conf.use_short_slot) ||
 453             !(ctx->staging.flags & RXON_FLG_BAND_24G_MSK))
 454                 ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
 455         else
 456                 ctx->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;
 457
 458         iwl_print_rx_config_cmd(priv, ctx->ctxid);
 459         ret = iwl_check_rxon_cmd(priv, ctx);
 460         if (ret) {
 461                 IWL_ERR(priv, "Invalid RXON configuration. Not committing.\n");
 462                 return -EINVAL;
 463         }
 464
 465         /*
 466          * receive commit_rxon request
 467          * abort any previous channel switch if still in process
 468          */
 469         if (test_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->shrd->status) &&
 470             (priv->switch_channel != ctx->staging.channel)) {
 471                 IWL_DEBUG_11H(priv, "abort channel switch on %d\n",
 472                               le16_to_cpu(priv->switch_channel));
 473                 iwl_chswitch_done(priv, false);
 474         }
 475
 476         /*
 477          * If we don't need to send a full RXON, we can use
 478          * iwl_rxon_assoc_cmd which is used to reconfigure filter
 479          * and other flags for the current radio configuration.
 480          */
 481         if (!iwl_full_rxon_required(priv, ctx)) {
 482                 ret = iwlagn_send_rxon_assoc(priv, ctx);
 483                 if (ret) {
 484                         IWL_ERR(priv, "Error setting RXON_ASSOC (%d)\n", ret);
 485                         return ret;
 486                 }
 487
 488                 memcpy(active, &ctx->staging, sizeof(*active));
 489                 /*
 490                  * We do not commit tx power settings while channel changing,
 491                  * do it now if after settings changed.
 492                  */
 493                 iwl_set_tx_power(priv, priv->tx_power_next, false);
 494
 495                 /* make sure we are in the right PS state */
 496                 iwl_power_update_mode(priv, true);
 497
 498                 return 0;
 499         }
 500
 501         iwl_set_rxon_hwcrypto(priv, ctx, !iwlagn_mod_params.sw_crypto);
 502
 503         IWL_DEBUG_INFO(priv,
 504                        "Going to commit RXON\n"
 505                        "  * with%s RXON_FILTER_ASSOC_MSK\n"
 506                        "  * channel = %d\n"
 507                        "  * bssid = %pM\n",
 508                        (new_assoc ? "" : "out"),
 509                        le16_to_cpu(ctx->staging.channel),
 510                        ctx->staging.bssid_addr);
 511
 512         /*
 513          * Always clear associated first, but with the correct config.
 514          * This is required as for example station addition for the
 515          * AP station must be done after the BSSID is set to correctly
 516          * set up filters in the device.
 517          */
 518         ret = iwlagn_rxon_disconn(priv, ctx);
 519         if (ret)
 520                 return ret;
 521
 522         ret = iwlagn_set_pan_params(priv);
 523         if (ret)
 524                 return ret;
 525
 526         if (new_assoc)
 527                 return iwlagn_rxon_connect(priv, ctx);
 528
 529         return 0;
 530 }
 531
 532 void iwlagn_config_ht40(struct ieee80211_conf *conf,
 533         struct iwl_rxon_context *ctx)
 534 {
 535         if (conf_is_ht40_minus(conf)) {
 536                 ctx->ht.extension_chan_offset =
 537                         IEEE80211_HT_PARAM_CHA_SEC_BELOW;
 538                 ctx->ht.is_40mhz = true;
 539         } else if (conf_is_ht40_plus(conf)) {
 540                 ctx->ht.extension_chan_offset =
 541                         IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
 542                 ctx->ht.is_40mhz = true;
 543         } else {
 544                 ctx->ht.extension_chan_offset =
 545                         IEEE80211_HT_PARAM_CHA_SEC_NONE;
 546                 ctx->ht.is_40mhz = false;
 547         }
 548 }
 549
 550 int iwlagn_mac_config(struct ieee80211_hw *hw, u32 changed)
 551 {
 552         struct iwl_priv *priv = IWL_MAC80211_GET_DVM(hw);
 553         struct iwl_rxon_context *ctx;
 554         struct ieee80211_conf *conf = &hw->conf;
 555         struct ieee80211_channel *channel = conf->channel;
 556         const struct iwl_channel_info *ch_info;
 557         int ret = 0;
 558
 559         IWL_DEBUG_MAC80211(priv, "enter: changed %#x", changed);
 560
 561         mutex_lock(&priv->shrd->mutex);
 562
 563         if (test_bit(STATUS_EXIT_PENDING, &priv->shrd->status))
 564                 goto out;
 565
 566         if (unlikely(test_bit(STATUS_SCANNING, &priv->shrd->status))) {
 567                 IWL_DEBUG_MAC80211(priv, "leave - scanning\n");
 568                 goto out;
 569         }
 570
 571         if (!iwl_is_ready(priv->shrd)) {
 572                 IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
 573                 goto out;
 574         }
 575
 576         if (changed & (IEEE80211_CONF_CHANGE_SMPS |
 577                        IEEE80211_CONF_CHANGE_CHANNEL)) {
 578                 /* mac80211 uses static for non-HT which is what we want */
 579                 priv->current_ht_config.smps = conf->smps_mode;
 580
 581                 /*
 582                  * Recalculate chain counts.
 583                  *
 584                  * If monitor mode is enabled then mac80211 will
 585                  * set up the SM PS mode to OFF if an HT channel is
 586                  * configured.
 587                  */
 588                 for_each_context(priv, ctx)
 589                         iwlagn_set_rxon_chain(priv, ctx);
 590         }
 591
 592         if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
 593                 unsigned long flags;
 594
 595                 ch_info = iwl_get_channel_info(priv, channel->band,
 596                                                channel->hw_value);
 597                 if (!is_channel_valid(ch_info)) {
 598                         IWL_DEBUG_MAC80211(priv, "leave - invalid channel\n");
 599                         ret = -EINVAL;
 600                         goto out;
 601                 }
 602
 603                 spin_lock_irqsave(&priv->shrd->lock, flags);
 604
 605                 for_each_context(priv, ctx) {
 606                         /* Configure HT40 channels */
 607                         if (ctx->ht.enabled != conf_is_ht(conf))
 608                                 ctx->ht.enabled = conf_is_ht(conf);
 609
 610                         if (ctx->ht.enabled) {
 611                                 /* if HT40 is used, it should not change
 612                                  * after associated except channel switch */
 613                                 if (!ctx->ht.is_40mhz ||
 614                                                 !iwl_is_associated_ctx(ctx))
 615                                         iwlagn_config_ht40(conf, ctx);
 616                         } else
 617                                 ctx->ht.is_40mhz = false;
 618
 619                         /*
 620                          * Default to no protection. Protection mode will
 621                          * later be set from BSS config in iwl_ht_conf
 622                          */
 623                         ctx->ht.protection = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
 624
 625                         /* if we are switching from ht to 2.4 clear flags
 626                          * from any ht related info since 2.4 does not
 627                          * support ht */
 628                         if (le16_to_cpu(ctx->staging.channel) !=
 629                             channel->hw_value)
 630                                 ctx->staging.flags = 0;
 631
 632                         iwl_set_rxon_channel(priv, channel, ctx);
 633                         iwl_set_rxon_ht(priv, &priv->current_ht_config);
 634
 635                         iwl_set_flags_for_band(priv, ctx, channel->band,
 636                                                ctx->vif);
 637                 }
 638
 639                 spin_unlock_irqrestore(&priv->shrd->lock, flags);
 640
 641                 iwl_update_bcast_stations(priv);
 642
 643                 /*
 644                  * The list of supported rates and rate mask can be different
 645                  * for each band; since the band may have changed, reset
 646                  * the rate mask to what mac80211 lists.
 647                  */
 648                 iwl_set_rate(priv);
 649         }
 650
 651         if (changed & (IEEE80211_CONF_CHANGE_PS |
 652                         IEEE80211_CONF_CHANGE_IDLE)) {
 653                 ret = iwl_power_update_mode(priv, false);
 654                 if (ret)
 655                         IWL_DEBUG_MAC80211(priv, "Error setting sleep level\n");
 656         }
 657
 658         if (changed & IEEE80211_CONF_CHANGE_POWER) {
 659                 IWL_DEBUG_MAC80211(priv, "TX Power old=%d new=%d\n",
 660                         priv->tx_power_user_lmt, conf->power_level);
 661
 662                 iwl_set_tx_power(priv, conf->power_level, false);
 663         }
 664
 665         for_each_context(priv, ctx) {
 666                 if (!memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
 667                         continue;
 668                 iwlagn_commit_rxon(priv, ctx);
 669         }
 670  out:
 671         mutex_unlock(&priv->shrd->mutex);
 672         IWL_DEBUG_MAC80211(priv, "leave\n");
 673
 674         return ret;
 675 }
 676
 677 static void iwlagn_check_needed_chains(struct iwl_priv *priv,
 678                                        struct iwl_rxon_context *ctx,
 679                                        struct ieee80211_bss_conf *bss_conf)
 680 {
 681         struct ieee80211_vif *vif = ctx->vif;
 682         struct iwl_rxon_context *tmp;
 683         struct ieee80211_sta *sta;
 684         struct iwl_ht_config *ht_conf = &priv->current_ht_config;
 685         struct ieee80211_sta_ht_cap *ht_cap;
 686         bool need_multiple;
 687
 688         lockdep_assert_held(&priv->shrd->mutex);
 689
 690         switch (vif->type) {
 691         case NL80211_IFTYPE_STATION:
 692                 rcu_read_lock();
 693                 sta = ieee80211_find_sta(vif, bss_conf->bssid);
 694                 if (!sta) {
 695                         /*
 696                          * If at all, this can only happen through a race
 697                          * when the AP disconnects us while we're still
 698                          * setting up the connection, in that case mac80211
 699                          * will soon tell us about that.
 700                          */
 701                         need_multiple = false;
 702                         rcu_read_unlock();
 703                         break;
 704                 }
 705
 706                 ht_cap = &sta->ht_cap;
 707
 708                 need_multiple = true;
 709
 710                 /*
 711                  * If the peer advertises no support for receiving 2 and 3
 712                  * stream MCS rates, it can't be transmitting them either.
 713                  */
 714                 if (ht_cap->mcs.rx_mask[1] == 0 &&
 715                     ht_cap->mcs.rx_mask[2] == 0) {
 716                         need_multiple = false;
 717                 } else if (!(ht_cap->mcs.tx_params &
 718                                                 IEEE80211_HT_MCS_TX_DEFINED)) {
 719                         /* If it can't TX MCS at all ... */
 720                         need_multiple = false;
 721                 } else if (ht_cap->mcs.tx_params &
 722                                                 IEEE80211_HT_MCS_TX_RX_DIFF) {
 723                         int maxstreams;
 724
 725                         /*
 726                          * But if it can receive them, it might still not
 727                          * be able to transmit them, which is what we need
 728                          * to check here -- so check the number of streams
 729                          * it advertises for TX (if different from RX).
 730                          */
 731
 732                         maxstreams = (ht_cap->mcs.tx_params &
 733                                  IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK);
 734                         maxstreams >>=
 735                                 IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT;
 736                         maxstreams += 1;
 737
 738                         if (maxstreams <= 1)
 739                                 need_multiple = false;
 740                 }
 741
 742                 rcu_read_unlock();
 743                 break;
 744         case NL80211_IFTYPE_ADHOC:
 745                 /* currently */
 746                 need_multiple = false;
 747                 break;
 748         default:
 749                 /* only AP really */
 750                 need_multiple = true;
 751                 break;
 752         }
 753
 754         ctx->ht_need_multiple_chains = need_multiple;
 755
 756         if (!need_multiple) {
 757                 /* check all contexts */
 758                 for_each_context(priv, tmp) {
 759                         if (!tmp->vif)
 760                                 continue;
 761                         if (tmp->ht_need_multiple_chains) {
 762                                 need_multiple = true;
 763                                 break;
 764                         }
 765                 }
 766         }
 767
 768         ht_conf->single_chain_sufficient = !need_multiple;
 769 }
 770
 771 static void iwlagn_chain_noise_reset(struct iwl_priv *priv)
 772 {
 773         struct iwl_chain_noise_data *data = &priv->chain_noise_data;
 774         int ret;
 775
 776         if ((data->state == IWL_CHAIN_NOISE_ALIVE) &&
 777             iwl_is_any_associated(priv)) {
 778                 struct iwl_calib_chain_noise_reset_cmd cmd;
 779
 780                 /* clear data for chain noise calibration algorithm */
 781                 data->chain_noise_a = 0;
 782                 data->chain_noise_b = 0;
 783                 data->chain_noise_c = 0;
 784                 data->chain_signal_a = 0;
 785                 data->chain_signal_b = 0;
 786                 data->chain_signal_c = 0;
 787                 data->beacon_count = 0;
 788
 789                 memset(&cmd, 0, sizeof(cmd));
 790                 iwl_set_calib_hdr(&cmd.hdr,
 791                         priv->phy_calib_chain_noise_reset_cmd);
 792                 ret = iwl_trans_send_cmd_pdu(trans(priv),
 793                                         REPLY_PHY_CALIBRATION_CMD,
 794                                         CMD_SYNC, sizeof(cmd), &cmd);
 795                 if (ret)
 796                         IWL_ERR(priv,
 797                                 "Could not send REPLY_PHY_CALIBRATION_CMD\n");
 798                 data->state = IWL_CHAIN_NOISE_ACCUMULATE;
 799                 IWL_DEBUG_CALIB(priv, "Run chain_noise_calibrate\n");
 800         }
 801 }
 802
 803 void iwlagn_bss_info_changed(struct ieee80211_hw *hw,
 804                              struct ieee80211_vif *vif,
 805                              struct ieee80211_bss_conf *bss_conf,
 806                              u32 changes)
 807 {
 808         struct iwl_priv *priv = IWL_MAC80211_GET_DVM(hw);
 809         struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
 810         int ret;
 811         bool force = false;
 812
 813         mutex_lock(&priv->shrd->mutex);
 814
 815         if (unlikely(!iwl_is_ready(priv->shrd))) {
 816                 IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
 817                 mutex_unlock(&priv->shrd->mutex);
 818                 return;
 819         }
 820
 821         if (unlikely(!ctx->vif)) {
 822                 IWL_DEBUG_MAC80211(priv, "leave - vif is NULL\n");
 823                 mutex_unlock(&priv->shrd->mutex);
 824                 return;
 825         }
 826
 827         if (changes & BSS_CHANGED_BEACON_INT)
 828                 force = true;
 829
 830         if (changes & BSS_CHANGED_QOS) {
 831                 ctx->qos_data.qos_active = bss_conf->qos;
 832                 iwlagn_update_qos(priv, ctx);
 833         }
 834
 835         ctx->staging.assoc_id = cpu_to_le16(vif->bss_conf.aid);
 836         if (vif->bss_conf.use_short_preamble)
 837                 ctx->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
 838         else
 839                 ctx->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
 840
 841         if (changes & BSS_CHANGED_ASSOC) {
 842                 if (bss_conf->assoc) {
 843                         priv->timestamp = bss_conf->timestamp;
 844                         ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
 845                 } else {
 846                         /*
 847                          * If we disassociate while there are pending
 848                          * frames, just wake up the queues and let the
 849                          * frames "escape" ... This shouldn't really
 850                          * be happening to start with, but we should
 851                          * not get stuck in this case either since it
 852                          * can happen if userspace gets confused.
 853                          */
 854                         if (ctx->last_tx_rejected) {
 855                                 ctx->last_tx_rejected = false;
 856                                 iwl_trans_wake_any_queue(trans(priv),
 857                                                          ctx->ctxid,
 858                                                          "Disassoc: flush queue");
 859                         }
 860                         ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
 861
 862                         if (ctx->ctxid == IWL_RXON_CTX_BSS)
 863                                 priv->have_rekey_data = false;
 864                 }
 865
 866                 iwlagn_bt_coex_rssi_monitor(priv);
 867         }
 868
 869         if (ctx->ht.enabled) {
 870                 ctx->ht.protection = bss_conf->ht_operation_mode &
 871                                         IEEE80211_HT_OP_MODE_PROTECTION;
 872                 ctx->ht.non_gf_sta_present = !!(bss_conf->ht_operation_mode &
 873                                         IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT);
 874                 iwlagn_check_needed_chains(priv, ctx, bss_conf);
 875                 iwl_set_rxon_ht(priv, &priv->current_ht_config);
 876         }
 877
 878         iwlagn_set_rxon_chain(priv, ctx);
 879
 880         if (bss_conf->use_cts_prot && (priv->band != IEEE80211_BAND_5GHZ))
 881                 ctx->staging.flags |= RXON_FLG_TGG_PROTECT_MSK;
 882         else
 883                 ctx->staging.flags &= ~RXON_FLG_TGG_PROTECT_MSK;
 884
 885         if (bss_conf->use_cts_prot)
 886                 ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
 887         else
 888                 ctx->staging.flags &= ~RXON_FLG_SELF_CTS_EN;
 889
 890         memcpy(ctx->staging.bssid_addr, bss_conf->bssid, ETH_ALEN);
 891
 892         if (vif->type == NL80211_IFTYPE_AP ||
 893             vif->type == NL80211_IFTYPE_ADHOC) {
 894                 if (vif->bss_conf.enable_beacon) {
 895                         ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
 896                         priv->beacon_ctx = ctx;
 897                 } else {
 898                         ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
 899                         priv->beacon_ctx = NULL;
 900                 }
 901         }
 902
 903         /*
 904          * If the ucode decides to do beacon filtering before
 905          * association, it will lose beacons that are needed
 906          * before sending frames out on passive channels. This
 907          * causes association failures on those channels. Enable
 908          * receiving beacons in such cases.
 909          */
 910
 911         if (vif->type == NL80211_IFTYPE_STATION) {
 912                 if (!bss_conf->assoc)
 913                         ctx->staging.filter_flags |= RXON_FILTER_BCON_AWARE_MSK;
 914                 else
 915                         ctx->staging.filter_flags &=
 916                                                     ~RXON_FILTER_BCON_AWARE_MSK;
 917         }
 918
 919         if (force || memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
 920                 iwlagn_commit_rxon(priv, ctx);
 921
 922         if (changes & BSS_CHANGED_ASSOC && bss_conf->assoc) {
 923                 /*
 924                  * The chain noise calibration will enable PM upon
 925                  * completion. If calibration has already been run
 926                  * then we need to enable power management here.
 927                  */
 928                 if (priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE)
 929                         iwl_power_update_mode(priv, false);
 930
 931                 /* Enable RX differential gain and sensitivity calibrations */
 932                 if (!priv->disable_chain_noise_cal)
 933                         iwlagn_chain_noise_reset(priv);
 934                 priv->start_calib = 1;
 935                 WARN_ON(ctx->preauth_bssid);
 936         }
 937
 938         if (changes & BSS_CHANGED_IBSS) {
 939                 ret = iwlagn_manage_ibss_station(priv, vif,
 940                                                  bss_conf->ibss_joined);
 941                 if (ret)
 942                         IWL_ERR(priv, "failed to %s IBSS station %pM\n",
 943                                 bss_conf->ibss_joined ? "add" : "remove",
 944                                 bss_conf->bssid);
 945         }
 946
 947         if (changes & BSS_CHANGED_BEACON && vif->type == NL80211_IFTYPE_ADHOC &&
 948             priv->beacon_ctx) {
 949                 if (iwlagn_update_beacon(priv, vif))
 950                         IWL_ERR(priv, "Error sending IBSS beacon\n");
 951         }
 952
 953         mutex_unlock(&priv->shrd->mutex);
 954 }
 955
 956 void iwlagn_post_scan(struct iwl_priv *priv)
 957 {
 958         struct iwl_rxon_context *ctx;
 959
 960         /*
 961          * We do not commit power settings while scan is pending,
 962          * do it now if the settings changed.
 963          */
 964         iwl_power_set_mode(priv, &priv->power_data.sleep_cmd_next, false);
 965         iwl_set_tx_power(priv, priv->tx_power_next, false);
 966
 967         /*
 968          * Since setting the RXON may have been deferred while
 969          * performing the scan, fire one off if needed
 970          */
 971         for_each_context(priv, ctx)
 972                 if (memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
 973                         iwlagn_commit_rxon(priv, ctx);
 974
 975         iwlagn_set_pan_params(priv);
 976 }