drivers/net/wireless/intel/iwlwifi/mvm/mac-ctxt.c

   1 /******************************************************************************
   2  *
   3  * This file is provided under a dual BSD/GPLv2 license.  When using or
   4  * redistributing this file, you may do so under either license.
   5  *
   6  * GPL LICENSE SUMMARY
   7  *
   8  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
   9  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
  10  * Copyright(c) 2015 - 2016 Intel Deutschland GmbH
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of version 2 of the GNU General Public License as
  14  * published by the Free Software Foundation.
  15  *
  16  * This program is distributed in the hope that it will be useful, but
  17  * WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  * General Public License for more details.
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  22  * along with this program; if not, write to the Free Software
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  24  * USA
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  27  * in the file called COPYING.
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  29  * Contact Information:
  30  *  Intel Linux Wireless <linuxwifi@intel.com>
  31  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  32  *
  33  * BSD LICENSE
  34  *
  35  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  36  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
  37  * Copyright(c) 2015 - 2016 Intel Deutschland GmbH
  38  * All rights reserved.
  39  *
  40  * Redistribution and use in source and binary forms, with or without
  41  * modification, are permitted provided that the following conditions
  42  * are met:
  43  *
  44  *  * Redistributions of source code must retain the above copyright
  45  *    notice, this list of conditions and the following disclaimer.
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  47  *    notice, this list of conditions and the following disclaimer in
  48  *    the documentation and/or other materials provided with the
  49  *    distribution.
  50  *  * Neither the name Intel Corporation nor the names of its
  51  *    contributors may be used to endorse or promote products derived
  52  *    from this software without specific prior written permission.
  53  *
  54  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  55  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  56  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  57  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  58  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  59  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  60  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  61  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  62  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  63  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  64  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  65  *
  66  *****************************************************************************/
  67
  68 #include <linux/etherdevice.h>
  69 #include <net/mac80211.h>
  70 #include "iwl-io.h"
  71 #include "iwl-prph.h"
  72 #include "fw-api.h"
  73 #include "mvm.h"
  74 #include "time-event.h"
  75 #include "fw-dbg.h"
  76
  77 const u8 iwl_mvm_ac_to_tx_fifo[] = {
  78         IWL_MVM_TX_FIFO_VO,
  79         IWL_MVM_TX_FIFO_VI,
  80         IWL_MVM_TX_FIFO_BE,
  81         IWL_MVM_TX_FIFO_BK,
  82 };
  83
  84 struct iwl_mvm_mac_iface_iterator_data {
  85         struct iwl_mvm *mvm;
  86         struct ieee80211_vif *vif;
  87         unsigned long available_mac_ids[BITS_TO_LONGS(NUM_MAC_INDEX_DRIVER)];
  88         unsigned long available_tsf_ids[BITS_TO_LONGS(NUM_TSF_IDS)];
  89         enum iwl_tsf_id preferred_tsf;
  90         bool found_vif;
  91 };
  92
  93 struct iwl_mvm_hw_queues_iface_iterator_data {
  94         struct ieee80211_vif *exclude_vif;
  95         unsigned long used_hw_queues;
  96 };
  97
  98 static void iwl_mvm_mac_tsf_id_iter(void *_data, u8 *mac,
  99                                     struct ieee80211_vif *vif)
 100 {
 101         struct iwl_mvm_mac_iface_iterator_data *data = _data;
 102         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 103         u16 min_bi;
 104
 105         /* Skip the interface for which we are trying to assign a tsf_id  */
 106         if (vif == data->vif)
 107                 return;
 108
 109         /*
 110          * The TSF is a hardware/firmware resource, there are 4 and
 111          * the driver should assign and free them as needed. However,
 112          * there are cases where 2 MACs should share the same TSF ID
 113          * for the purpose of clock sync, an optimization to avoid
 114          * clock drift causing overlapping TBTTs/DTIMs for a GO and
 115          * client in the system.
 116          *
 117          * The firmware will decide according to the MAC type which
 118          * will be the master and slave. Clients that need to sync
 119          * with a remote station will be the master, and an AP or GO
 120          * will be the slave.
 121          *
 122          * Depending on the new interface type it can be slaved to
 123          * or become the master of an existing interface.
 124          */
 125         switch (data->vif->type) {
 126         case NL80211_IFTYPE_STATION:
 127                 /*
 128                  * The new interface is a client, so if the one we're iterating
 129                  * is an AP, and the beacon interval of the AP is a multiple or
 130                  * divisor of the beacon interval of the client, the same TSF
 131                  * should be used to avoid drift between the new client and
 132                  * existing AP. The existing AP will get drift updates from the
 133                  * new client context in this case.
 134                  */
 135                 if (vif->type != NL80211_IFTYPE_AP ||
 136                     data->preferred_tsf != NUM_TSF_IDS ||
 137                     !test_bit(mvmvif->tsf_id, data->available_tsf_ids))
 138                         break;
 139
 140                 min_bi = min(data->vif->bss_conf.beacon_int,
 141                              vif->bss_conf.beacon_int);
 142
 143                 if (!min_bi)
 144                         break;
 145
 146                 if ((data->vif->bss_conf.beacon_int -
 147                      vif->bss_conf.beacon_int) % min_bi == 0) {
 148                         data->preferred_tsf = mvmvif->tsf_id;
 149                         return;
 150                 }
 151                 break;
 152
 153         case NL80211_IFTYPE_AP:
 154                 /*
 155                  * The new interface is AP/GO, so if its beacon interval is a
 156                  * multiple or a divisor of the beacon interval of an existing
 157                  * interface, it should get drift updates from an existing
 158                  * client or use the same TSF as an existing GO. There's no
 159                  * drift between TSFs internally but if they used different
 160                  * TSFs then a new client MAC could update one of them and
 161                  * cause drift that way.
 162                  */
 163                 if ((vif->type != NL80211_IFTYPE_AP &&
 164                      vif->type != NL80211_IFTYPE_STATION) ||
 165                     data->preferred_tsf != NUM_TSF_IDS ||
 166                     !test_bit(mvmvif->tsf_id, data->available_tsf_ids))
 167                         break;
 168
 169                 min_bi = min(data->vif->bss_conf.beacon_int,
 170                              vif->bss_conf.beacon_int);
 171
 172                 if (!min_bi)
 173                         break;
 174
 175                 if ((data->vif->bss_conf.beacon_int -
 176                      vif->bss_conf.beacon_int) % min_bi == 0) {
 177                         data->preferred_tsf = mvmvif->tsf_id;
 178                         return;
 179                 }
 180                 break;
 181         default:
 182                 /*
 183                  * For all other interface types there's no need to
 184                  * take drift into account. Either they're exclusive
 185                  * like IBSS and monitor, or we don't care much about
 186                  * their TSF (like P2P Device), but we won't be able
 187                  * to share the TSF resource.
 188                  */
 189                 break;
 190         }
 191
 192         /*
 193          * Unless we exited above, we can't share the TSF resource
 194          * that the virtual interface we're iterating over is using
 195          * with the new one, so clear the available bit and if this
 196          * was the preferred one, reset that as well.
 197          */
 198         __clear_bit(mvmvif->tsf_id, data->available_tsf_ids);
 199
 200         if (data->preferred_tsf == mvmvif->tsf_id)
 201                 data->preferred_tsf = NUM_TSF_IDS;
 202 }
 203
 204 /*
 205  * Get the mask of the queues used by the vif
 206  */
 207 u32 iwl_mvm_mac_get_queues_mask(struct ieee80211_vif *vif)
 208 {
 209         u32 qmask = 0, ac;
 210
 211         if (vif->type == NL80211_IFTYPE_P2P_DEVICE)
 212                 return BIT(IWL_MVM_OFFCHANNEL_QUEUE);
 213
 214         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
 215                 if (vif->hw_queue[ac] != IEEE80211_INVAL_HW_QUEUE)
 216                         qmask |= BIT(vif->hw_queue[ac]);
 217         }
 218
 219         if (vif->type == NL80211_IFTYPE_AP)
 220                 qmask |= BIT(vif->cab_queue);
 221
 222         return qmask;
 223 }
 224
 225 static void iwl_mvm_iface_hw_queues_iter(void *_data, u8 *mac,
 226                                          struct ieee80211_vif *vif)
 227 {
 228         struct iwl_mvm_hw_queues_iface_iterator_data *data = _data;
 229
 230         /* exclude the given vif */
 231         if (vif == data->exclude_vif)
 232                 return;
 233
 234         data->used_hw_queues |= iwl_mvm_mac_get_queues_mask(vif);
 235 }
 236
 237 static void iwl_mvm_mac_sta_hw_queues_iter(void *_data,
 238                                            struct ieee80211_sta *sta)
 239 {
 240         struct iwl_mvm_hw_queues_iface_iterator_data *data = _data;
 241         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 242
 243         /* Mark the queues used by the sta */
 244         data->used_hw_queues |= mvmsta->tfd_queue_msk;
 245 }
 246
 247 unsigned long iwl_mvm_get_used_hw_queues(struct iwl_mvm *mvm,
 248                                          struct ieee80211_vif *exclude_vif)
 249 {
 250         u8 sta_id;
 251         struct iwl_mvm_hw_queues_iface_iterator_data data = {
 252                 .exclude_vif = exclude_vif,
 253                 .used_hw_queues =
 254                         BIT(IWL_MVM_OFFCHANNEL_QUEUE) |
 255                         BIT(mvm->aux_queue) |
 256                         BIT(IWL_MVM_CMD_QUEUE),
 257         };
 258
 259         lockdep_assert_held(&mvm->mutex);
 260
 261         /* mark all VIF used hw queues */
 262         ieee80211_iterate_active_interfaces_atomic(
 263                 mvm->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
 264                 iwl_mvm_iface_hw_queues_iter, &data);
 265
 266         /* don't assign the same hw queues as TDLS stations */
 267         ieee80211_iterate_stations_atomic(mvm->hw,
 268                                           iwl_mvm_mac_sta_hw_queues_iter,
 269                                           &data);
 270
 271         /*
 272          * Some TDLS stations may be removed but are in the process of being
 273          * drained. Don't touch their queues.
 274          */
 275         for_each_set_bit(sta_id, mvm->sta_drained, IWL_MVM_STATION_COUNT)
 276                 data.used_hw_queues |= mvm->tfd_drained[sta_id];
 277
 278         return data.used_hw_queues;
 279 }
 280
 281 static void iwl_mvm_mac_iface_iterator(void *_data, u8 *mac,
 282                                        struct ieee80211_vif *vif)
 283 {
 284         struct iwl_mvm_mac_iface_iterator_data *data = _data;
 285         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 286
 287         /* Iterator may already find the interface being added -- skip it */
 288         if (vif == data->vif) {
 289                 data->found_vif = true;
 290                 return;
 291         }
 292
 293         /* Mark MAC IDs as used by clearing the available bit, and
 294          * (below) mark TSFs as used if their existing use is not
 295          * compatible with the new interface type.
 296          * No locking or atomic bit operations are needed since the
 297          * data is on the stack of the caller function.
 298          */
 299         __clear_bit(mvmvif->id, data->available_mac_ids);
 300
 301         /* find a suitable tsf_id */
 302         iwl_mvm_mac_tsf_id_iter(_data, mac, vif);
 303 }
 304
 305 void iwl_mvm_mac_ctxt_recalc_tsf_id(struct iwl_mvm *mvm,
 306                                     struct ieee80211_vif *vif)
 307 {
 308         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 309         struct iwl_mvm_mac_iface_iterator_data data = {
 310                 .mvm = mvm,
 311                 .vif = vif,
 312                 .available_tsf_ids = { (1 << NUM_TSF_IDS) - 1 },
 313                 /* no preference yet */
 314                 .preferred_tsf = NUM_TSF_IDS,
 315         };
 316
 317         ieee80211_iterate_active_interfaces_atomic(
 318                 mvm->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
 319                 iwl_mvm_mac_tsf_id_iter, &data);
 320
 321         if (data.preferred_tsf != NUM_TSF_IDS)
 322                 mvmvif->tsf_id = data.preferred_tsf;
 323         else if (!test_bit(mvmvif->tsf_id, data.available_tsf_ids))
 324                 mvmvif->tsf_id = find_first_bit(data.available_tsf_ids,
 325                                                 NUM_TSF_IDS);
 326 }
 327
 328 static int iwl_mvm_mac_ctxt_allocate_resources(struct iwl_mvm *mvm,
 329                                                struct ieee80211_vif *vif)
 330 {
 331         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 332         struct iwl_mvm_mac_iface_iterator_data data = {
 333                 .mvm = mvm,
 334                 .vif = vif,
 335                 .available_mac_ids = { (1 << NUM_MAC_INDEX_DRIVER) - 1 },
 336                 .available_tsf_ids = { (1 << NUM_TSF_IDS) - 1 },
 337                 /* no preference yet */
 338                 .preferred_tsf = NUM_TSF_IDS,
 339                 .found_vif = false,
 340         };
 341         u32 ac;
 342         int ret, i;
 343         unsigned long used_hw_queues;
 344
 345         /*
 346          * Allocate a MAC ID and a TSF for this MAC, along with the queues
 347          * and other resources.
 348          */
 349
 350         /*
 351          * Before the iterator, we start with all MAC IDs and TSFs available.
 352          *
 353          * During iteration, all MAC IDs are cleared that are in use by other
 354          * virtual interfaces, and all TSF IDs are cleared that can't be used
 355          * by this new virtual interface because they're used by an interface
 356          * that can't share it with the new one.
 357          * At the same time, we check if there's a preferred TSF in the case
 358          * that we should share it with another interface.
 359          */
 360
 361         /* Currently, MAC ID 0 should be used only for the managed/IBSS vif */
 362         switch (vif->type) {
 363         case NL80211_IFTYPE_ADHOC:
 364                 break;
 365         case NL80211_IFTYPE_STATION:
 366                 if (!vif->p2p)
 367                         break;
 368                 /* fall through */
 369         default:
 370                 __clear_bit(0, data.available_mac_ids);
 371         }
 372
 373         ieee80211_iterate_active_interfaces_atomic(
 374                 mvm->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
 375                 iwl_mvm_mac_iface_iterator, &data);
 376
 377         used_hw_queues = iwl_mvm_get_used_hw_queues(mvm, vif);
 378
 379         /*
 380          * In the case we're getting here during resume, it's similar to
 381          * firmware restart, and with RESUME_ALL the iterator will find
 382          * the vif being added already.
 383          * We don't want to reassign any IDs in either case since doing
 384          * so would probably assign different IDs (as interfaces aren't
 385          * necessarily added in the same order), but the old IDs were
 386          * preserved anyway, so skip ID assignment for both resume and
 387          * recovery.
 388          */
 389         if (data.found_vif)
 390                 return 0;
 391
 392         /* Therefore, in recovery, we can't get here */
 393         if (WARN_ON_ONCE(test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status)))
 394                 return -EBUSY;
 395
 396         mvmvif->id = find_first_bit(data.available_mac_ids,
 397                                     NUM_MAC_INDEX_DRIVER);
 398         if (mvmvif->id == NUM_MAC_INDEX_DRIVER) {
 399                 IWL_ERR(mvm, "Failed to init MAC context - no free ID!\n");
 400                 ret = -EIO;
 401                 goto exit_fail;
 402         }
 403
 404         if (data.preferred_tsf != NUM_TSF_IDS)
 405                 mvmvif->tsf_id = data.preferred_tsf;
 406         else
 407                 mvmvif->tsf_id = find_first_bit(data.available_tsf_ids,
 408                                                 NUM_TSF_IDS);
 409         if (mvmvif->tsf_id == NUM_TSF_IDS) {
 410                 IWL_ERR(mvm, "Failed to init MAC context - no free TSF!\n");
 411                 ret = -EIO;
 412                 goto exit_fail;
 413         }
 414
 415         mvmvif->color = 0;
 416
 417         INIT_LIST_HEAD(&mvmvif->time_event_data.list);
 418         mvmvif->time_event_data.id = TE_MAX;
 419
 420         /* No need to allocate data queues to P2P Device MAC.*/
 421         if (vif->type == NL80211_IFTYPE_P2P_DEVICE) {
 422                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
 423                         vif->hw_queue[ac] = IEEE80211_INVAL_HW_QUEUE;
 424
 425                 return 0;
 426         }
 427
 428         /* Find available queues, and allocate them to the ACs */
 429         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
 430                 u8 queue = find_first_zero_bit(&used_hw_queues,
 431                                                mvm->first_agg_queue);
 432
 433                 if (queue >= mvm->first_agg_queue) {
 434                         IWL_ERR(mvm, "Failed to allocate queue\n");
 435                         ret = -EIO;
 436                         goto exit_fail;
 437                 }
 438
 439                 __set_bit(queue, &used_hw_queues);
 440                 vif->hw_queue[ac] = queue;
 441         }
 442
 443         /* Allocate the CAB queue for softAP and GO interfaces */
 444         if (vif->type == NL80211_IFTYPE_AP) {
 445                 u8 queue = find_first_zero_bit(&used_hw_queues,
 446                                                mvm->first_agg_queue);
 447
 448                 if (queue >= mvm->first_agg_queue) {
 449                         IWL_ERR(mvm, "Failed to allocate cab queue\n");
 450                         ret = -EIO;
 451                         goto exit_fail;
 452                 }
 453
 454                 vif->cab_queue = queue;
 455         } else {
 456                 vif->cab_queue = IEEE80211_INVAL_HW_QUEUE;
 457         }
 458
 459         mvmvif->bcast_sta.sta_id = IWL_MVM_STATION_COUNT;
 460         mvmvif->ap_sta_id = IWL_MVM_STATION_COUNT;
 461
 462         for (i = 0; i < NUM_IWL_MVM_SMPS_REQ; i++)
 463                 mvmvif->smps_requests[i] = IEEE80211_SMPS_AUTOMATIC;
 464
 465         return 0;
 466
 467 exit_fail:
 468         memset(mvmvif, 0, sizeof(struct iwl_mvm_vif));
 469         memset(vif->hw_queue, IEEE80211_INVAL_HW_QUEUE, sizeof(vif->hw_queue));
 470         vif->cab_queue = IEEE80211_INVAL_HW_QUEUE;
 471         return ret;
 472 }
 473
 474 int iwl_mvm_mac_ctxt_init(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
 475 {
 476         unsigned int wdg_timeout =
 477                 iwl_mvm_get_wd_timeout(mvm, vif, false, false);
 478         u32 ac;
 479         int ret;
 480
 481         lockdep_assert_held(&mvm->mutex);
 482
 483         ret = iwl_mvm_mac_ctxt_allocate_resources(mvm, vif);
 484         if (ret)
 485                 return ret;
 486
 487         switch (vif->type) {
 488         case NL80211_IFTYPE_P2P_DEVICE:
 489                 iwl_mvm_enable_ac_txq(mvm, IWL_MVM_OFFCHANNEL_QUEUE,
 490                                       IWL_MVM_OFFCHANNEL_QUEUE,
 491                                       IWL_MVM_TX_FIFO_VO, 0, wdg_timeout);
 492                 break;
 493         case NL80211_IFTYPE_AP:
 494                 iwl_mvm_enable_ac_txq(mvm, vif->cab_queue, vif->cab_queue,
 495                                       IWL_MVM_TX_FIFO_MCAST, 0, wdg_timeout);
 496                 /* fall through */
 497         default:
 498                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
 499                         iwl_mvm_enable_ac_txq(mvm, vif->hw_queue[ac],
 500                                               vif->hw_queue[ac],
 501                                               iwl_mvm_ac_to_tx_fifo[ac], 0,
 502                                               wdg_timeout);
 503                 break;
 504         }
 505
 506         return 0;
 507 }
 508
 509 void iwl_mvm_mac_ctxt_release(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
 510 {
 511         int ac;
 512
 513         lockdep_assert_held(&mvm->mutex);
 514
 515         switch (vif->type) {
 516         case NL80211_IFTYPE_P2P_DEVICE:
 517                 iwl_mvm_disable_txq(mvm, IWL_MVM_OFFCHANNEL_QUEUE,
 518                                     IWL_MVM_OFFCHANNEL_QUEUE, IWL_MAX_TID_COUNT,
 519                                     0);
 520                 break;
 521         case NL80211_IFTYPE_AP:
 522                 iwl_mvm_disable_txq(mvm, vif->cab_queue, vif->cab_queue,
 523                                     IWL_MAX_TID_COUNT, 0);
 524                 /* fall through */
 525         default:
 526                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
 527                         iwl_mvm_disable_txq(mvm, vif->hw_queue[ac],
 528                                             vif->hw_queue[ac],
 529                                             IWL_MAX_TID_COUNT, 0);
 530         }
 531 }
 532
 533 static void iwl_mvm_ack_rates(struct iwl_mvm *mvm,
 534                               struct ieee80211_vif *vif,
 535                               enum ieee80211_band band,
 536                               u8 *cck_rates, u8 *ofdm_rates)
 537 {
 538         struct ieee80211_supported_band *sband;
 539         unsigned long basic = vif->bss_conf.basic_rates;
 540         int lowest_present_ofdm = 100;
 541         int lowest_present_cck = 100;
 542         u8 cck = 0;
 543         u8 ofdm = 0;
 544         int i;
 545
 546         sband = mvm->hw->wiphy->bands[band];
 547
 548         for_each_set_bit(i, &basic, BITS_PER_LONG) {
 549                 int hw = sband->bitrates[i].hw_value;
 550                 if (hw >= IWL_FIRST_OFDM_RATE) {
 551                         ofdm |= BIT(hw - IWL_FIRST_OFDM_RATE);
 552                         if (lowest_present_ofdm > hw)
 553                                 lowest_present_ofdm = hw;
 554                 } else {
 555                         BUILD_BUG_ON(IWL_FIRST_CCK_RATE != 0);
 556
 557                         cck |= BIT(hw);
 558                         if (lowest_present_cck > hw)
 559                                 lowest_present_cck = hw;
 560                 }
 561         }
 562
 563         /*
 564          * Now we've got the basic rates as bitmaps in the ofdm and cck
 565          * variables. This isn't sufficient though, as there might not
 566          * be all the right rates in the bitmap. E.g. if the only basic
 567          * rates are 5.5 Mbps and 11 Mbps, we still need to add 1 Mbps
 568          * and 6 Mbps because the 802.11-2007 standard says in 9.6:
 569          *
 570          *    [...] a STA responding to a received frame shall transmit
 571          *    its Control Response frame [...] at the highest rate in the
 572          *    BSSBasicRateSet parameter that is less than or equal to the
 573          *    rate of the immediately previous frame in the frame exchange
 574          *    sequence ([...]) and that is of the same modulation class
 575          *    ([...]) as the received frame. If no rate contained in the
 576          *    BSSBasicRateSet parameter meets these conditions, then the
 577          *    control frame sent in response to a received frame shall be
 578          *    transmitted at the highest mandatory rate of the PHY that is
 579          *    less than or equal to the rate of the received frame, and
 580          *    that is of the same modulation class as the received frame.
 581          *
 582          * As a consequence, we need to add all mandatory rates that are
 583          * lower than all of the basic rates to these bitmaps.
 584          */
 585
 586         if (IWL_RATE_24M_INDEX < lowest_present_ofdm)
 587                 ofdm |= IWL_RATE_BIT_MSK(24) >> IWL_FIRST_OFDM_RATE;
 588         if (IWL_RATE_12M_INDEX < lowest_present_ofdm)
 589                 ofdm |= IWL_RATE_BIT_MSK(12) >> IWL_FIRST_OFDM_RATE;
 590         /* 6M already there or needed so always add */
 591         ofdm |= IWL_RATE_BIT_MSK(6) >> IWL_FIRST_OFDM_RATE;
 592
 593         /*
 594          * CCK is a bit more complex with DSSS vs. HR/DSSS vs. ERP.
 595          * Note, however:
 596          *  - if no CCK rates are basic, it must be ERP since there must
 597          *    be some basic rates at all, so they're OFDM => ERP PHY
 598          *    (or we're in 5 GHz, and the cck bitmap will never be used)
 599          *  - if 11M is a basic rate, it must be ERP as well, so add 5.5M
 600          *  - if 5.5M is basic, 1M and 2M are mandatory
 601          *  - if 2M is basic, 1M is mandatory
 602          *  - if 1M is basic, that's the only valid ACK rate.
 603          * As a consequence, it's not as complicated as it sounds, just add
 604          * any lower rates to the ACK rate bitmap.
 605          */
 606         if (IWL_RATE_11M_INDEX < lowest_present_cck)
 607                 cck |= IWL_RATE_BIT_MSK(11) >> IWL_FIRST_CCK_RATE;
 608         if (IWL_RATE_5M_INDEX < lowest_present_cck)
 609                 cck |= IWL_RATE_BIT_MSK(5) >> IWL_FIRST_CCK_RATE;
 610         if (IWL_RATE_2M_INDEX < lowest_present_cck)
 611                 cck |= IWL_RATE_BIT_MSK(2) >> IWL_FIRST_CCK_RATE;
 612         /* 1M already there or needed so always add */
 613         cck |= IWL_RATE_BIT_MSK(1) >> IWL_FIRST_CCK_RATE;
 614
 615         *cck_rates = cck;
 616         *ofdm_rates = ofdm;
 617 }
 618
 619 static void iwl_mvm_mac_ctxt_set_ht_flags(struct iwl_mvm *mvm,
 620                                          struct ieee80211_vif *vif,
 621                                          struct iwl_mac_ctx_cmd *cmd)
 622 {
 623         /* for both sta and ap, ht_operation_mode hold the protection_mode */
 624         u8 protection_mode = vif->bss_conf.ht_operation_mode &
 625                                  IEEE80211_HT_OP_MODE_PROTECTION;
 626         /* The fw does not distinguish between ht and fat */
 627         u32 ht_flag = MAC_PROT_FLG_HT_PROT | MAC_PROT_FLG_FAT_PROT;
 628
 629         IWL_DEBUG_RATE(mvm, "protection mode set to %d\n", protection_mode);
 630         /*
 631          * See section 9.23.3.1 of IEEE 80211-2012.
 632          * Nongreenfield HT STAs Present is not supported.
 633          */
 634         switch (protection_mode) {
 635         case IEEE80211_HT_OP_MODE_PROTECTION_NONE:
 636                 break;
 637         case IEEE80211_HT_OP_MODE_PROTECTION_NONMEMBER:
 638         case IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED:
 639                 cmd->protection_flags |= cpu_to_le32(ht_flag);
 640                 break;
 641         case IEEE80211_HT_OP_MODE_PROTECTION_20MHZ:
 642                 /* Protect when channel wider than 20MHz */
 643                 if (vif->bss_conf.chandef.width > NL80211_CHAN_WIDTH_20)
 644                         cmd->protection_flags |= cpu_to_le32(ht_flag);
 645                 break;
 646         default:
 647                 IWL_ERR(mvm, "Illegal protection mode %d\n",
 648                         protection_mode);
 649                 break;
 650         }
 651 }
 652
 653 static void iwl_mvm_mac_ctxt_cmd_common(struct iwl_mvm *mvm,
 654                                         struct ieee80211_vif *vif,
 655                                         struct iwl_mac_ctx_cmd *cmd,
 656                                         const u8 *bssid_override,
 657                                         u32 action)
 658 {
 659         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 660         struct ieee80211_chanctx_conf *chanctx;
 661         bool ht_enabled = !!(vif->bss_conf.ht_operation_mode &
 662                              IEEE80211_HT_OP_MODE_PROTECTION);
 663         u8 cck_ack_rates, ofdm_ack_rates;
 664         const u8 *bssid = bssid_override ?: vif->bss_conf.bssid;
 665         int i;
 666
 667         cmd->id_and_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id,
 668                                                             mvmvif->color));
 669         cmd->action = cpu_to_le32(action);
 670
 671         switch (vif->type) {
 672         case NL80211_IFTYPE_STATION:
 673                 if (vif->p2p)
 674                         cmd->mac_type = cpu_to_le32(FW_MAC_TYPE_P2P_STA);
 675                 else
 676                         cmd->mac_type = cpu_to_le32(FW_MAC_TYPE_BSS_STA);
 677                 break;
 678         case NL80211_IFTYPE_AP:
 679                 cmd->mac_type = cpu_to_le32(FW_MAC_TYPE_GO);
 680                 break;
 681         case NL80211_IFTYPE_MONITOR:
 682                 cmd->mac_type = cpu_to_le32(FW_MAC_TYPE_LISTENER);
 683                 break;
 684         case NL80211_IFTYPE_P2P_DEVICE:
 685                 cmd->mac_type = cpu_to_le32(FW_MAC_TYPE_P2P_DEVICE);
 686                 break;
 687         case NL80211_IFTYPE_ADHOC:
 688                 cmd->mac_type = cpu_to_le32(FW_MAC_TYPE_IBSS);
 689                 break;
 690         default:
 691                 WARN_ON_ONCE(1);
 692         }
 693
 694         cmd->tsf_id = cpu_to_le32(mvmvif->tsf_id);
 695
 696         memcpy(cmd->node_addr, vif->addr, ETH_ALEN);
 697
 698         if (bssid)
 699                 memcpy(cmd->bssid_addr, bssid, ETH_ALEN);
 700         else
 701                 eth_broadcast_addr(cmd->bssid_addr);
 702
 703         rcu_read_lock();
 704         chanctx = rcu_dereference(vif->chanctx_conf);
 705         iwl_mvm_ack_rates(mvm, vif, chanctx ? chanctx->def.chan->band
 706                                             : IEEE80211_BAND_2GHZ,
 707                           &cck_ack_rates, &ofdm_ack_rates);
 708         rcu_read_unlock();
 709
 710         cmd->cck_rates = cpu_to_le32((u32)cck_ack_rates);
 711         cmd->ofdm_rates = cpu_to_le32((u32)ofdm_ack_rates);
 712
 713         cmd->cck_short_preamble =
 714                 cpu_to_le32(vif->bss_conf.use_short_preamble ?
 715                             MAC_FLG_SHORT_PREAMBLE : 0);
 716         cmd->short_slot =
 717                 cpu_to_le32(vif->bss_conf.use_short_slot ?
 718                             MAC_FLG_SHORT_SLOT : 0);
 719
 720         cmd->filter_flags = cpu_to_le32(MAC_FILTER_ACCEPT_GRP);
 721
 722         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 723                 u8 txf = iwl_mvm_ac_to_tx_fifo[i];
 724
 725                 cmd->ac[txf].cw_min =
 726                         cpu_to_le16(mvmvif->queue_params[i].cw_min);
 727                 cmd->ac[txf].cw_max =
 728                         cpu_to_le16(mvmvif->queue_params[i].cw_max);
 729                 cmd->ac[txf].edca_txop =
 730                         cpu_to_le16(mvmvif->queue_params[i].txop * 32);
 731                 cmd->ac[txf].aifsn = mvmvif->queue_params[i].aifs;
 732                 cmd->ac[txf].fifos_mask = BIT(txf);
 733         }
 734
 735         if (vif->type == NL80211_IFTYPE_AP) {
 736                 /* in AP mode, the MCAST FIFO takes the EDCA params from VO */
 737                 cmd->ac[IWL_MVM_TX_FIFO_VO].fifos_mask |=
 738                         BIT(IWL_MVM_TX_FIFO_MCAST);
 739
 740                 /*
 741                  * in AP mode, pass probe requests and beacons from other APs
 742                  * (needed for ht protection); when there're no any associated
 743                  * station don't ask FW to pass beacons to prevent unnecessary
 744                  * wake-ups.
 745                  */
 746                 cmd->filter_flags |= cpu_to_le32(MAC_FILTER_IN_PROBE_REQUEST);
 747                 if (mvmvif->ap_assoc_sta_count || !mvm->drop_bcn_ap_mode) {
 748                         cmd->filter_flags |= cpu_to_le32(MAC_FILTER_IN_BEACON);
 749                         IWL_DEBUG_HC(mvm, "Asking FW to pass beacons\n");
 750                 } else {
 751                         IWL_DEBUG_HC(mvm, "No need to receive beacons\n");
 752                 }
 753         }
 754
 755         if (vif->bss_conf.qos)
 756                 cmd->qos_flags |= cpu_to_le32(MAC_QOS_FLG_UPDATE_EDCA);
 757
 758         if (vif->bss_conf.use_cts_prot)
 759                 cmd->protection_flags |= cpu_to_le32(MAC_PROT_FLG_TGG_PROTECT);
 760
 761         IWL_DEBUG_RATE(mvm, "use_cts_prot %d, ht_operation_mode %d\n",
 762                        vif->bss_conf.use_cts_prot,
 763                        vif->bss_conf.ht_operation_mode);
 764         if (vif->bss_conf.chandef.width != NL80211_CHAN_WIDTH_20_NOHT)
 765                 cmd->qos_flags |= cpu_to_le32(MAC_QOS_FLG_TGN);
 766         if (ht_enabled)
 767                 iwl_mvm_mac_ctxt_set_ht_flags(mvm, vif, cmd);
 768 }
 769
 770 static int iwl_mvm_mac_ctxt_send_cmd(struct iwl_mvm *mvm,
 771                                      struct iwl_mac_ctx_cmd *cmd)
 772 {
 773         int ret = iwl_mvm_send_cmd_pdu(mvm, MAC_CONTEXT_CMD, 0,
 774                                        sizeof(*cmd), cmd);
 775         if (ret)
 776                 IWL_ERR(mvm, "Failed to send MAC context (action:%d): %d\n",
 777                         le32_to_cpu(cmd->action), ret);
 778         return ret;
 779 }
 780
 781 static int iwl_mvm_mac_ctxt_cmd_sta(struct iwl_mvm *mvm,
 782                                     struct ieee80211_vif *vif,
 783                                     u32 action, bool force_assoc_off,
 784                                     const u8 *bssid_override)
 785 {
 786         struct iwl_mac_ctx_cmd cmd = {};
 787         struct iwl_mac_data_sta *ctxt_sta;
 788
 789         WARN_ON(vif->type != NL80211_IFTYPE_STATION);
 790
 791         /* Fill the common data for all mac context types */
 792         iwl_mvm_mac_ctxt_cmd_common(mvm, vif, &cmd, bssid_override, action);
 793
 794         if (vif->p2p) {
 795                 struct ieee80211_p2p_noa_attr *noa =
 796                         &vif->bss_conf.p2p_noa_attr;
 797
 798                 cmd.p2p_sta.ctwin = cpu_to_le32(noa->oppps_ctwindow &
 799                                         IEEE80211_P2P_OPPPS_CTWINDOW_MASK);
 800                 ctxt_sta = &cmd.p2p_sta.sta;
 801         } else {
 802                 ctxt_sta = &cmd.sta;
 803         }
 804
 805         /* We need the dtim_period to set the MAC as associated */
 806         if (vif->bss_conf.assoc && vif->bss_conf.dtim_period &&
 807             !force_assoc_off) {
 808                 u32 dtim_offs;
 809
 810                 /*
 811                  * The DTIM count counts down, so when it is N that means N
 812                  * more beacon intervals happen until the DTIM TBTT. Therefore
 813                  * add this to the current time. If that ends up being in the
 814                  * future, the firmware will handle it.
 815                  *
 816                  * Also note that the system_timestamp (which we get here as
 817                  * "sync_device_ts") and TSF timestamp aren't at exactly the
 818                  * same offset in the frame -- the TSF is at the first symbol
 819                  * of the TSF, the system timestamp is at signal acquisition
 820                  * time. This means there's an offset between them of at most
 821                  * a few hundred microseconds (24 * 8 bits + PLCP time gives
 822                  * 384us in the longest case), this is currently not relevant
 823                  * as the firmware wakes up around 2ms before the TBTT.
 824                  */
 825                 dtim_offs = vif->bss_conf.sync_dtim_count *
 826                                 vif->bss_conf.beacon_int;
 827                 /* convert TU to usecs */
 828                 dtim_offs *= 1024;
 829
 830                 ctxt_sta->dtim_tsf =
 831                         cpu_to_le64(vif->bss_conf.sync_tsf + dtim_offs);
 832                 ctxt_sta->dtim_time =
 833                         cpu_to_le32(vif->bss_conf.sync_device_ts + dtim_offs);
 834
 835                 IWL_DEBUG_INFO(mvm, "DTIM TBTT is 0x%llx/0x%x, offset %d\n",
 836                                le64_to_cpu(ctxt_sta->dtim_tsf),
 837                                le32_to_cpu(ctxt_sta->dtim_time),
 838                                dtim_offs);
 839
 840                 ctxt_sta->is_assoc = cpu_to_le32(1);
 841         } else {
 842                 ctxt_sta->is_assoc = cpu_to_le32(0);
 843
 844                 /* Allow beacons to pass through as long as we are not
 845                  * associated, or we do not have dtim period information.
 846                  */
 847                 cmd.filter_flags |= cpu_to_le32(MAC_FILTER_IN_BEACON);
 848         }
 849
 850         ctxt_sta->bi = cpu_to_le32(vif->bss_conf.beacon_int);
 851         ctxt_sta->bi_reciprocal =
 852                 cpu_to_le32(iwl_mvm_reciprocal(vif->bss_conf.beacon_int));
 853         ctxt_sta->dtim_interval = cpu_to_le32(vif->bss_conf.beacon_int *
 854                                               vif->bss_conf.dtim_period);
 855         ctxt_sta->dtim_reciprocal =
 856                 cpu_to_le32(iwl_mvm_reciprocal(vif->bss_conf.beacon_int *
 857                                                vif->bss_conf.dtim_period));
 858
 859         ctxt_sta->listen_interval = cpu_to_le32(mvm->hw->conf.listen_interval);
 860         ctxt_sta->assoc_id = cpu_to_le32(vif->bss_conf.aid);
 861
 862         if (vif->probe_req_reg && vif->bss_conf.assoc && vif->p2p)
 863                 cmd.filter_flags |= cpu_to_le32(MAC_FILTER_IN_PROBE_REQUEST);
 864
 865         return iwl_mvm_mac_ctxt_send_cmd(mvm, &cmd);
 866 }
 867
 868 static int iwl_mvm_mac_ctxt_cmd_listener(struct iwl_mvm *mvm,
 869                                          struct ieee80211_vif *vif,
 870                                          u32 action)
 871 {
 872         struct iwl_mac_ctx_cmd cmd = {};
 873         u32 tfd_queue_msk = 0;
 874         int ret, i;
 875
 876         WARN_ON(vif->type != NL80211_IFTYPE_MONITOR);
 877
 878         iwl_mvm_mac_ctxt_cmd_common(mvm, vif, &cmd, NULL, action);
 879
 880         for (i = 0; i < IEEE80211_NUM_ACS; i++)
 881                 if (vif->hw_queue[i] != IEEE80211_INVAL_HW_QUEUE)
 882                         tfd_queue_msk |= BIT(vif->hw_queue[i]);
 883
 884         cmd.filter_flags = cpu_to_le32(MAC_FILTER_IN_PROMISC |
 885                                        MAC_FILTER_IN_CONTROL_AND_MGMT |
 886                                        MAC_FILTER_IN_BEACON |
 887                                        MAC_FILTER_IN_PROBE_REQUEST |
 888                                        MAC_FILTER_IN_CRC32);
 889         ieee80211_hw_set(mvm->hw, RX_INCLUDES_FCS);
 890
 891         /* Allocate sniffer station */
 892         ret = iwl_mvm_allocate_int_sta(mvm, &mvm->snif_sta, tfd_queue_msk,
 893                                        vif->type);
 894         if (ret)
 895                 return ret;
 896
 897         return iwl_mvm_mac_ctxt_send_cmd(mvm, &cmd);
 898 }
 899
 900 static int iwl_mvm_mac_ctxt_cmd_ibss(struct iwl_mvm *mvm,
 901                                      struct ieee80211_vif *vif,
 902                                      u32 action)
 903 {
 904         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 905         struct iwl_mac_ctx_cmd cmd = {};
 906
 907         WARN_ON(vif->type != NL80211_IFTYPE_ADHOC);
 908
 909         iwl_mvm_mac_ctxt_cmd_common(mvm, vif, &cmd, NULL, action);
 910
 911         cmd.filter_flags = cpu_to_le32(MAC_FILTER_IN_BEACON |
 912                                        MAC_FILTER_IN_PROBE_REQUEST);
 913
 914         /* cmd.ibss.beacon_time/cmd.ibss.beacon_tsf are curently ignored */
 915         cmd.ibss.bi = cpu_to_le32(vif->bss_conf.beacon_int);
 916         cmd.ibss.bi_reciprocal =
 917                 cpu_to_le32(iwl_mvm_reciprocal(vif->bss_conf.beacon_int));
 918
 919         /* TODO: Assumes that the beacon id == mac context id */
 920         cmd.ibss.beacon_template = cpu_to_le32(mvmvif->id);
 921
 922         return iwl_mvm_mac_ctxt_send_cmd(mvm, &cmd);
 923 }
 924
 925 struct iwl_mvm_go_iterator_data {
 926         bool go_active;
 927 };
 928
 929 static void iwl_mvm_go_iterator(void *_data, u8 *mac, struct ieee80211_vif *vif)
 930 {
 931         struct iwl_mvm_go_iterator_data *data = _data;
 932         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 933
 934         if (vif->type == NL80211_IFTYPE_AP && vif->p2p &&
 935             mvmvif->ap_ibss_active)
 936                 data->go_active = true;
 937 }
 938
 939 static int iwl_mvm_mac_ctxt_cmd_p2p_device(struct iwl_mvm *mvm,
 940                                            struct ieee80211_vif *vif,
 941                                            u32 action)
 942 {
 943         struct iwl_mac_ctx_cmd cmd = {};
 944         struct iwl_mvm_go_iterator_data data = {};
 945
 946         WARN_ON(vif->type != NL80211_IFTYPE_P2P_DEVICE);
 947
 948         iwl_mvm_mac_ctxt_cmd_common(mvm, vif, &cmd, NULL, action);
 949
 950         cmd.protection_flags |= cpu_to_le32(MAC_PROT_FLG_TGG_PROTECT);
 951
 952         /* Override the filter flags to accept only probe requests */
 953         cmd.filter_flags = cpu_to_le32(MAC_FILTER_IN_PROBE_REQUEST);
 954
 955         /*
 956          * This flag should be set to true when the P2P Device is
 957          * discoverable and there is at least another active P2P GO. Settings
 958          * this flag will allow the P2P Device to be discoverable on other
 959          * channels in addition to its listen channel.
 960          * Note that this flag should not be set in other cases as it opens the
 961          * Rx filters on all MAC and increases the number of interrupts.
 962          */
 963         ieee80211_iterate_active_interfaces_atomic(
 964                 mvm->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
 965                 iwl_mvm_go_iterator, &data);
 966
 967         cmd.p2p_dev.is_disc_extended = cpu_to_le32(data.go_active ? 1 : 0);
 968         return iwl_mvm_mac_ctxt_send_cmd(mvm, &cmd);
 969 }
 970
 971 static void iwl_mvm_mac_ctxt_set_tim(struct iwl_mvm *mvm,
 972                                      struct iwl_mac_beacon_cmd *beacon_cmd,
 973                                      u8 *beacon, u32 frame_size)
 974 {
 975         u32 tim_idx;
 976         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)beacon;
 977
 978         /* The index is relative to frame start but we start looking at the
 979          * variable-length part of the beacon. */
 980         tim_idx = mgmt->u.beacon.variable - beacon;
 981
 982         /* Parse variable-length elements of beacon to find WLAN_EID_TIM */
 983         while ((tim_idx < (frame_size - 2)) &&
 984                         (beacon[tim_idx] != WLAN_EID_TIM))
 985                 tim_idx += beacon[tim_idx+1] + 2;
 986
 987         /* If TIM field was found, set variables */
 988         if ((tim_idx < (frame_size - 1)) && (beacon[tim_idx] == WLAN_EID_TIM)) {
 989                 beacon_cmd->tim_idx = cpu_to_le32(tim_idx);
 990                 beacon_cmd->tim_size = cpu_to_le32((u32)beacon[tim_idx+1]);
 991         } else {
 992                 IWL_WARN(mvm, "Unable to find TIM Element in beacon\n");
 993         }
 994 }
 995
 996 static int iwl_mvm_mac_ctxt_send_beacon(struct iwl_mvm *mvm,
 997                                         struct ieee80211_vif *vif,
 998                                         struct sk_buff *beacon)
 999 {
1000         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
1001         struct iwl_host_cmd cmd = {
1002                 .id = BEACON_TEMPLATE_CMD,
1003                 .flags = CMD_ASYNC,
1004         };
1005         struct iwl_mac_beacon_cmd beacon_cmd = {};
1006         struct ieee80211_tx_info *info;
1007         u32 beacon_skb_len;
1008         u32 rate, tx_flags;
1009
1010         if (WARN_ON(!beacon))
1011                 return -EINVAL;
1012
1013         beacon_skb_len = beacon->len;
1014
1015         /* TODO: for now the beacon template id is set to be the mac context id.
1016          * Might be better to handle it as another resource ... */
1017         beacon_cmd.template_id = cpu_to_le32((u32)mvmvif->id);
1018         info = IEEE80211_SKB_CB(beacon);
1019
1020         /* Set up TX command fields */
1021         beacon_cmd.tx.len = cpu_to_le16((u16)beacon_skb_len);
1022         beacon_cmd.tx.sta_id = mvmvif->bcast_sta.sta_id;
1023         beacon_cmd.tx.life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
1024         tx_flags = TX_CMD_FLG_SEQ_CTL | TX_CMD_FLG_TSF;
1025         tx_flags |=
1026                 iwl_mvm_bt_coex_tx_prio(mvm, (void *)beacon->data, info, 0) <<
1027                                                 TX_CMD_FLG_BT_PRIO_POS;
1028         beacon_cmd.tx.tx_flags = cpu_to_le32(tx_flags);
1029
1030         if (!fw_has_capa(&mvm->fw->ucode_capa,
1031                          IWL_UCODE_TLV_CAPA_BEACON_ANT_SELECTION)) {
1032                 mvm->mgmt_last_antenna_idx =
1033                         iwl_mvm_next_antenna(mvm, iwl_mvm_get_valid_tx_ant(mvm),
1034                                              mvm->mgmt_last_antenna_idx);
1035         }
1036
1037         beacon_cmd.tx.rate_n_flags =
1038                 cpu_to_le32(BIT(mvm->mgmt_last_antenna_idx) <<
1039                             RATE_MCS_ANT_POS);
1040
1041         if (info->band == IEEE80211_BAND_5GHZ || vif->p2p) {
1042                 rate = IWL_FIRST_OFDM_RATE;
1043         } else {
1044                 rate = IWL_FIRST_CCK_RATE;
1045                 beacon_cmd.tx.rate_n_flags |= cpu_to_le32(RATE_MCS_CCK_MSK);
1046         }
1047         beacon_cmd.tx.rate_n_flags |=
1048                 cpu_to_le32(iwl_mvm_mac80211_idx_to_hwrate(rate));
1049
1050         /* Set up TX beacon command fields */
1051         if (vif->type == NL80211_IFTYPE_AP)
1052                 iwl_mvm_mac_ctxt_set_tim(mvm, &beacon_cmd,
1053                                          beacon->data,
1054                                          beacon_skb_len);
1055
1056         /* Submit command */
1057         cmd.len[0] = sizeof(beacon_cmd);
1058         cmd.data[0] = &beacon_cmd;
1059         cmd.dataflags[0] = 0;
1060         cmd.len[1] = beacon_skb_len;
1061         cmd.data[1] = beacon->data;
1062         cmd.dataflags[1] = IWL_HCMD_DFL_DUP;
1063
1064         return iwl_mvm_send_cmd(mvm, &cmd);
1065 }
1066
1067 /* The beacon template for the AP/GO/IBSS has changed and needs update */
1068 int iwl_mvm_mac_ctxt_beacon_changed(struct iwl_mvm *mvm,
1069                                     struct ieee80211_vif *vif)
1070 {
1071         struct sk_buff *beacon;
1072         int ret;
1073
1074         WARN_ON(vif->type != NL80211_IFTYPE_AP &&
1075                 vif->type != NL80211_IFTYPE_ADHOC);
1076
1077         beacon = ieee80211_beacon_get_template(mvm->hw, vif, NULL);
1078         if (!beacon)
1079                 return -ENOMEM;
1080
1081         ret = iwl_mvm_mac_ctxt_send_beacon(mvm, vif, beacon);
1082         dev_kfree_skb(beacon);
1083         return ret;
1084 }
1085
1086 struct iwl_mvm_mac_ap_iterator_data {
1087         struct iwl_mvm *mvm;
1088         struct ieee80211_vif *vif;
1089         u32 beacon_device_ts;
1090         u16 beacon_int;
1091 };
1092
1093 /* Find the beacon_device_ts and beacon_int for a managed interface */
1094 static void iwl_mvm_mac_ap_iterator(void *_data, u8 *mac,
1095                                     struct ieee80211_vif *vif)
1096 {
1097         struct iwl_mvm_mac_ap_iterator_data *data = _data;
1098
1099         if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc)
1100                 return;
1101
1102         /* Station client has higher priority over P2P client*/
1103         if (vif->p2p && data->beacon_device_ts)
1104                 return;
1105
1106         data->beacon_device_ts = vif->bss_conf.sync_device_ts;
1107         data->beacon_int = vif->bss_conf.beacon_int;
1108 }
1109
1110 /*
1111  * Fill the specific data for mac context of type AP of P2P GO
1112  */
1113 static void iwl_mvm_mac_ctxt_cmd_fill_ap(struct iwl_mvm *mvm,
1114                                          struct ieee80211_vif *vif,
1115                                          struct iwl_mac_data_ap *ctxt_ap,
1116                                          bool add)
1117 {
1118         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
1119         struct iwl_mvm_mac_ap_iterator_data data = {
1120                 .mvm = mvm,
1121                 .vif = vif,
1122                 .beacon_device_ts = 0
1123         };
1124
1125         ctxt_ap->bi = cpu_to_le32(vif->bss_conf.beacon_int);
1126         ctxt_ap->bi_reciprocal =
1127                 cpu_to_le32(iwl_mvm_reciprocal(vif->bss_conf.beacon_int));
1128         ctxt_ap->dtim_interval = cpu_to_le32(vif->bss_conf.beacon_int *
1129                                              vif->bss_conf.dtim_period);
1130         ctxt_ap->dtim_reciprocal =
1131                 cpu_to_le32(iwl_mvm_reciprocal(vif->bss_conf.beacon_int *
1132                                                vif->bss_conf.dtim_period));
1133
1134         ctxt_ap->mcast_qid = cpu_to_le32(vif->cab_queue);
1135
1136         /*
1137          * Only set the beacon time when the MAC is being added, when we
1138          * just modify the MAC then we should keep the time -- the firmware
1139          * can otherwise have a "jumping" TBTT.
1140          */
1141         if (add) {
1142                 /*
1143                  * If there is a station/P2P client interface which is
1144                  * associated, set the AP's TBTT far enough from the station's
1145                  * TBTT. Otherwise, set it to the current system time
1146                  */
1147                 ieee80211_iterate_active_interfaces_atomic(
1148                         mvm->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
1149                         iwl_mvm_mac_ap_iterator, &data);
1150
1151                 if (data.beacon_device_ts) {
1152                         u32 rand = (prandom_u32() % (64 - 36)) + 36;
1153                         mvmvif->ap_beacon_time = data.beacon_device_ts +
1154                                 ieee80211_tu_to_usec(data.beacon_int * rand /
1155                                                      100);
1156                 } else {
1157                         mvmvif->ap_beacon_time =
1158                                 iwl_read_prph(mvm->trans,
1159                                               DEVICE_SYSTEM_TIME_REG);
1160                 }
1161         }
1162
1163         ctxt_ap->beacon_time = cpu_to_le32(mvmvif->ap_beacon_time);
1164         ctxt_ap->beacon_tsf = 0; /* unused */
1165
1166         /* TODO: Assume that the beacon id == mac context id */
1167         ctxt_ap->beacon_template = cpu_to_le32(mvmvif->id);
1168 }
1169
1170 static int iwl_mvm_mac_ctxt_cmd_ap(struct iwl_mvm *mvm,
1171                                    struct ieee80211_vif *vif,
1172                                    u32 action)
1173 {
1174         struct iwl_mac_ctx_cmd cmd = {};
1175
1176         WARN_ON(vif->type != NL80211_IFTYPE_AP || vif->p2p);
1177
1178         /* Fill the common data for all mac context types */
1179         iwl_mvm_mac_ctxt_cmd_common(mvm, vif, &cmd, NULL, action);
1180
1181         /* Fill the data specific for ap mode */
1182         iwl_mvm_mac_ctxt_cmd_fill_ap(mvm, vif, &cmd.ap,
1183                                      action == FW_CTXT_ACTION_ADD);
1184
1185         return iwl_mvm_mac_ctxt_send_cmd(mvm, &cmd);
1186 }
1187
1188 static int iwl_mvm_mac_ctxt_cmd_go(struct iwl_mvm *mvm,
1189                                    struct ieee80211_vif *vif,
1190                                    u32 action)
1191 {
1192         struct iwl_mac_ctx_cmd cmd = {};
1193         struct ieee80211_p2p_noa_attr *noa = &vif->bss_conf.p2p_noa_attr;
1194
1195         WARN_ON(vif->type != NL80211_IFTYPE_AP || !vif->p2p);
1196
1197         /* Fill the common data for all mac context types */
1198         iwl_mvm_mac_ctxt_cmd_common(mvm, vif, &cmd, NULL, action);
1199
1200         /* Fill the data specific for GO mode */
1201         iwl_mvm_mac_ctxt_cmd_fill_ap(mvm, vif, &cmd.go.ap,
1202                                      action == FW_CTXT_ACTION_ADD);
1203
1204         cmd.go.ctwin = cpu_to_le32(noa->oppps_ctwindow &
1205                                         IEEE80211_P2P_OPPPS_CTWINDOW_MASK);
1206         cmd.go.opp_ps_enabled =
1207                         cpu_to_le32(!!(noa->oppps_ctwindow &
1208                                         IEEE80211_P2P_OPPPS_ENABLE_BIT));
1209
1210         return iwl_mvm_mac_ctxt_send_cmd(mvm, &cmd);
1211 }
1212
1213 static int iwl_mvm_mac_ctx_send(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1214                                 u32 action, bool force_assoc_off,
1215                                 const u8 *bssid_override)
1216 {
1217         switch (vif->type) {
1218         case NL80211_IFTYPE_STATION:
1219                 return iwl_mvm_mac_ctxt_cmd_sta(mvm, vif, action,
1220                                                 force_assoc_off,
1221                                                 bssid_override);
1222                 break;
1223         case NL80211_IFTYPE_AP:
1224                 if (!vif->p2p)
1225                         return iwl_mvm_mac_ctxt_cmd_ap(mvm, vif, action);
1226                 else
1227                         return iwl_mvm_mac_ctxt_cmd_go(mvm, vif, action);
1228                 break;
1229         case NL80211_IFTYPE_MONITOR:
1230                 return iwl_mvm_mac_ctxt_cmd_listener(mvm, vif, action);
1231         case NL80211_IFTYPE_P2P_DEVICE:
1232                 return iwl_mvm_mac_ctxt_cmd_p2p_device(mvm, vif, action);
1233         case NL80211_IFTYPE_ADHOC:
1234                 return iwl_mvm_mac_ctxt_cmd_ibss(mvm, vif, action);
1235         default:
1236                 break;
1237         }
1238
1239         return -EOPNOTSUPP;
1240 }
1241
1242 int iwl_mvm_mac_ctxt_add(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
1243 {
1244         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
1245         int ret;
1246
1247         if (WARN_ONCE(mvmvif->uploaded, "Adding active MAC %pM/%d\n",
1248                       vif->addr, ieee80211_vif_type_p2p(vif)))
1249                 return -EIO;
1250
1251         ret = iwl_mvm_mac_ctx_send(mvm, vif, FW_CTXT_ACTION_ADD,
1252                                    true, NULL);
1253         if (ret)
1254                 return ret;
1255
1256         /* will only do anything at resume from D3 time */
1257         iwl_mvm_set_last_nonqos_seq(mvm, vif);
1258
1259         mvmvif->uploaded = true;
1260         return 0;
1261 }
1262
1263 int iwl_mvm_mac_ctxt_changed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1264                              bool force_assoc_off, const u8 *bssid_override)
1265 {
1266         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
1267
1268         if (WARN_ONCE(!mvmvif->uploaded, "Changing inactive MAC %pM/%d\n",
1269                       vif->addr, ieee80211_vif_type_p2p(vif)))
1270                 return -EIO;
1271
1272         return iwl_mvm_mac_ctx_send(mvm, vif, FW_CTXT_ACTION_MODIFY,
1273                                     force_assoc_off, bssid_override);
1274 }
1275
1276 int iwl_mvm_mac_ctxt_remove(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
1277 {
1278         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
1279         struct iwl_mac_ctx_cmd cmd;
1280         int ret;
1281
1282         if (WARN_ONCE(!mvmvif->uploaded, "Removing inactive MAC %pM/%d\n",
1283                       vif->addr, ieee80211_vif_type_p2p(vif)))
1284                 return -EIO;
1285
1286         memset(&cmd, 0, sizeof(cmd));
1287
1288         cmd.id_and_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id,
1289                                                            mvmvif->color));
1290         cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE);
1291
1292         ret = iwl_mvm_send_cmd_pdu(mvm, MAC_CONTEXT_CMD, 0,
1293                                    sizeof(cmd), &cmd);
1294         if (ret) {
1295                 IWL_ERR(mvm, "Failed to remove MAC context: %d\n", ret);
1296                 return ret;
1297         }
1298
1299         mvmvif->uploaded = false;
1300
1301         if (vif->type == NL80211_IFTYPE_MONITOR) {
1302                 __clear_bit(IEEE80211_HW_RX_INCLUDES_FCS, mvm->hw->flags);
1303                 iwl_mvm_dealloc_snif_sta(mvm);
1304         }
1305
1306         return 0;
1307 }
1308
1309 static void iwl_mvm_csa_count_down(struct iwl_mvm *mvm,
1310                                    struct ieee80211_vif *csa_vif, u32 gp2,
1311                                    bool tx_success)
1312 {
1313         struct iwl_mvm_vif *mvmvif =
1314                         iwl_mvm_vif_from_mac80211(csa_vif);
1315
1316         /* Don't start to countdown from a failed beacon */
1317         if (!tx_success && !mvmvif->csa_countdown)
1318                 return;
1319
1320         mvmvif->csa_countdown = true;
1321
1322         if (!ieee80211_csa_is_complete(csa_vif)) {
1323                 int c = ieee80211_csa_update_counter(csa_vif);
1324
1325                 iwl_mvm_mac_ctxt_beacon_changed(mvm, csa_vif);
1326                 if (csa_vif->p2p &&
1327                     !iwl_mvm_te_scheduled(&mvmvif->time_event_data) && gp2 &&
1328                     tx_success) {
1329                         u32 rel_time = (c + 1) *
1330                                        csa_vif->bss_conf.beacon_int -
1331                                        IWL_MVM_CHANNEL_SWITCH_TIME_GO;
1332                         u32 apply_time = gp2 + rel_time * 1024;
1333
1334                         iwl_mvm_schedule_csa_period(mvm, csa_vif,
1335                                          IWL_MVM_CHANNEL_SWITCH_TIME_GO -
1336                                          IWL_MVM_CHANNEL_SWITCH_MARGIN,
1337                                          apply_time);
1338                 }
1339         } else if (!iwl_mvm_te_scheduled(&mvmvif->time_event_data)) {
1340                 /* we don't have CSA NoA scheduled yet, switch now */
1341                 ieee80211_csa_finish(csa_vif);
1342                 RCU_INIT_POINTER(mvm->csa_vif, NULL);
1343         }
1344 }
1345
1346 void iwl_mvm_rx_beacon_notif(struct iwl_mvm *mvm,
1347                              struct iwl_rx_cmd_buffer *rxb)
1348 {
1349         struct iwl_rx_packet *pkt = rxb_addr(rxb);
1350         struct iwl_extended_beacon_notif *beacon = (void *)pkt->data;
1351         struct iwl_mvm_tx_resp *beacon_notify_hdr;
1352         struct ieee80211_vif *csa_vif;
1353         struct ieee80211_vif *tx_blocked_vif;
1354         u16 status;
1355
1356         lockdep_assert_held(&mvm->mutex);
1357
1358         beacon_notify_hdr = &beacon->beacon_notify_hdr;
1359         mvm->ap_last_beacon_gp2 = le32_to_cpu(beacon->gp2);
1360
1361         status = le16_to_cpu(beacon_notify_hdr->status.status) & TX_STATUS_MSK;
1362         IWL_DEBUG_RX(mvm,
1363                      "beacon status %#x retries:%d tsf:0x%16llX gp2:0x%X rate:%d\n",
1364                      status, beacon_notify_hdr->failure_frame,
1365                      le64_to_cpu(beacon->tsf),
1366                      mvm->ap_last_beacon_gp2,
1367                      le32_to_cpu(beacon_notify_hdr->initial_rate));
1368
1369         csa_vif = rcu_dereference_protected(mvm->csa_vif,
1370                                             lockdep_is_held(&mvm->mutex));
1371         if (unlikely(csa_vif && csa_vif->csa_active))
1372                 iwl_mvm_csa_count_down(mvm, csa_vif, mvm->ap_last_beacon_gp2,
1373                                        (status == TX_STATUS_SUCCESS));
1374
1375         tx_blocked_vif = rcu_dereference_protected(mvm->csa_tx_blocked_vif,
1376                                                 lockdep_is_held(&mvm->mutex));
1377         if (unlikely(tx_blocked_vif)) {
1378                 struct iwl_mvm_vif *mvmvif =
1379                         iwl_mvm_vif_from_mac80211(tx_blocked_vif);
1380
1381                 /*
1382                  * The channel switch is started and we have blocked the
1383                  * stations. If this is the first beacon (the timeout wasn't
1384                  * set), set the unblock timeout, otherwise countdown
1385                  */
1386                 if (!mvm->csa_tx_block_bcn_timeout)
1387                         mvm->csa_tx_block_bcn_timeout =
1388                                 IWL_MVM_CS_UNBLOCK_TX_TIMEOUT;
1389                 else
1390                         mvm->csa_tx_block_bcn_timeout--;
1391
1392                 /* Check if the timeout is expired, and unblock tx */
1393                 if (mvm->csa_tx_block_bcn_timeout == 0) {
1394                         iwl_mvm_modify_all_sta_disable_tx(mvm, mvmvif, false);
1395                         RCU_INIT_POINTER(mvm->csa_tx_blocked_vif, NULL);
1396                 }
1397         }
1398 }
1399
1400 static void iwl_mvm_beacon_loss_iterator(void *_data, u8 *mac,
1401                                          struct ieee80211_vif *vif)
1402 {
1403         struct iwl_missed_beacons_notif *missed_beacons = _data;
1404         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
1405         struct iwl_mvm *mvm = mvmvif->mvm;
1406         struct iwl_fw_dbg_trigger_missed_bcon *bcon_trig;
1407         struct iwl_fw_dbg_trigger_tlv *trigger;
1408         u32 stop_trig_missed_bcon, stop_trig_missed_bcon_since_rx;
1409         u32 rx_missed_bcon, rx_missed_bcon_since_rx;
1410
1411         if (mvmvif->id != (u16)le32_to_cpu(missed_beacons->mac_id))
1412                 return;
1413
1414         rx_missed_bcon = le32_to_cpu(missed_beacons->consec_missed_beacons);
1415         rx_missed_bcon_since_rx =
1416                 le32_to_cpu(missed_beacons->consec_missed_beacons_since_last_rx);
1417         /*
1418          * TODO: the threshold should be adjusted based on latency conditions,
1419          * and/or in case of a CS flow on one of the other AP vifs.
1420          */
1421         if (le32_to_cpu(missed_beacons->consec_missed_beacons_since_last_rx) >
1422              IWL_MVM_MISSED_BEACONS_THRESHOLD)
1423                 ieee80211_beacon_loss(vif);
1424
1425         if (!iwl_fw_dbg_trigger_enabled(mvm->fw,
1426                                         FW_DBG_TRIGGER_MISSED_BEACONS))
1427                 return;
1428
1429         trigger = iwl_fw_dbg_get_trigger(mvm->fw,
1430                                          FW_DBG_TRIGGER_MISSED_BEACONS);
1431         bcon_trig = (void *)trigger->data;
1432         stop_trig_missed_bcon = le32_to_cpu(bcon_trig->stop_consec_missed_bcon);
1433         stop_trig_missed_bcon_since_rx =
1434                 le32_to_cpu(bcon_trig->stop_consec_missed_bcon_since_rx);
1435
1436         /* TODO: implement start trigger */
1437
1438         if (!iwl_fw_dbg_trigger_check_stop(mvm, vif, trigger))
1439                 return;
1440
1441         if (rx_missed_bcon_since_rx >= stop_trig_missed_bcon_since_rx ||
1442             rx_missed_bcon >= stop_trig_missed_bcon)
1443                 iwl_mvm_fw_dbg_collect_trig(mvm, trigger, NULL);
1444 }
1445
1446 void iwl_mvm_rx_missed_beacons_notif(struct iwl_mvm *mvm,
1447                                      struct iwl_rx_cmd_buffer *rxb)
1448 {
1449         struct iwl_rx_packet *pkt = rxb_addr(rxb);
1450         struct iwl_missed_beacons_notif *mb = (void *)pkt->data;
1451
1452         IWL_DEBUG_INFO(mvm,
1453                        "missed bcn mac_id=%u, consecutive=%u (%u, %u, %u)\n",
1454                        le32_to_cpu(mb->mac_id),
1455                        le32_to_cpu(mb->consec_missed_beacons),
1456                        le32_to_cpu(mb->consec_missed_beacons_since_last_rx),
1457                        le32_to_cpu(mb->num_recvd_beacons),
1458                        le32_to_cpu(mb->num_expected_beacons));
1459
1460         ieee80211_iterate_active_interfaces_atomic(mvm->hw,
1461                                                    IEEE80211_IFACE_ITER_NORMAL,
1462                                                    iwl_mvm_beacon_loss_iterator,
1463                                                    mb);
1464 }
1465
1466 void iwl_mvm_rx_stored_beacon_notif(struct iwl_mvm *mvm,
1467                                     struct iwl_rx_cmd_buffer *rxb)
1468 {
1469         struct iwl_rx_packet *pkt = rxb_addr(rxb);
1470         struct iwl_stored_beacon_notif *sb = (void *)pkt->data;
1471         struct ieee80211_rx_status rx_status;
1472         struct sk_buff *skb;
1473         u32 size = le32_to_cpu(sb->byte_count);
1474
1475         if (size == 0)
1476                 return;
1477
1478         skb = alloc_skb(size, GFP_ATOMIC);
1479         if (!skb) {
1480                 IWL_ERR(mvm, "alloc_skb failed\n");
1481                 return;
1482         }
1483
1484         /* update rx_status according to the notification's metadata */
1485         memset(&rx_status, 0, sizeof(rx_status));
1486         rx_status.mactime = le64_to_cpu(sb->tsf);
1487         /* TSF as indicated by the firmware  is at INA time */
1488         rx_status.flag |= RX_FLAG_MACTIME_PLCP_START;
1489         rx_status.device_timestamp = le32_to_cpu(sb->system_time);
1490         rx_status.band =
1491                 (sb->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_BAND_24)) ?
1492                                 IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
1493         rx_status.freq =
1494                 ieee80211_channel_to_frequency(le16_to_cpu(sb->channel),
1495                                                rx_status.band);
1496
1497         /* copy the data */
1498         memcpy(skb_put(skb, size), sb->data, size);
1499         memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status));
1500
1501         /* pass it as regular rx to mac80211 */
1502         ieee80211_rx_napi(mvm->hw, NULL, skb, NULL);
1503 }