drivers/net/wireless/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  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of version 2 of the GNU General Public License as
  13  * published by the Free Software Foundation.
  14  *
  15  * This program is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
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  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  23  * USA
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  28  * Contact Information:
  29  *  Intel Linux Wireless <ilw@linux.intel.com>
  30  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  31  *
  32  * BSD LICENSE
  33  *
  34  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  35  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
  36  * All rights reserved.
  37  *
  38  * Redistribution and use in source and binary forms, with or without
  39  * modification, are permitted provided that the following conditions
  40  * are met:
  41  *
  42  *  * Redistributions of source code must retain the above copyright
  43  *    notice, this list of conditions and the following disclaimer.
  44  *  * Redistributions in binary form must reproduce the above copyright
  45  *    notice, this list of conditions and the following disclaimer in
  46  *    the documentation and/or other materials provided with the
  47  *    distribution.
  48  *  * Neither the name Intel Corporation nor the names of its
  49  *    contributors may be used to endorse or promote products derived
  50  *    from this software without specific prior written permission.
  51  *
  52  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  53  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  54  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  55  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  56  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  57  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  58  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  59  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  60  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  61  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  62  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  63  *
  64  *****************************************************************************/
  65
  66 #include <linux/etherdevice.h>
  67 #include <net/mac80211.h>
  68 #include "iwl-io.h"
  69 #include "iwl-prph.h"
  70 #include "fw-api.h"
  71 #include "mvm.h"
  72 #include "time-event.h"
  73
  74 const u8 iwl_mvm_ac_to_tx_fifo[] = {
  75         IWL_MVM_TX_FIFO_VO,
  76         IWL_MVM_TX_FIFO_VI,
  77         IWL_MVM_TX_FIFO_BE,
  78         IWL_MVM_TX_FIFO_BK,
  79 };
  80
  81 struct iwl_mvm_mac_iface_iterator_data {
  82         struct iwl_mvm *mvm;
  83         struct ieee80211_vif *vif;
  84         unsigned long available_mac_ids[BITS_TO_LONGS(NUM_MAC_INDEX_DRIVER)];
  85         unsigned long available_tsf_ids[BITS_TO_LONGS(NUM_TSF_IDS)];
  86         enum iwl_tsf_id preferred_tsf;
  87         bool found_vif;
  88 };
  89
  90 struct iwl_mvm_hw_queues_iface_iterator_data {
  91         struct ieee80211_vif *exclude_vif;
  92         unsigned long used_hw_queues;
  93 };
  94
  95 static void iwl_mvm_mac_tsf_id_iter(void *_data, u8 *mac,
  96                                     struct ieee80211_vif *vif)
  97 {
  98         struct iwl_mvm_mac_iface_iterator_data *data = _data;
  99         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 100         u16 min_bi;
 101
 102         /* Skip the interface for which we are trying to assign a tsf_id  */
 103         if (vif == data->vif)
 104                 return;
 105
 106         /*
 107          * The TSF is a hardware/firmware resource, there are 4 and
 108          * the driver should assign and free them as needed. However,
 109          * there are cases where 2 MACs should share the same TSF ID
 110          * for the purpose of clock sync, an optimization to avoid
 111          * clock drift causing overlapping TBTTs/DTIMs for a GO and
 112          * client in the system.
 113          *
 114          * The firmware will decide according to the MAC type which
 115          * will be the master and slave. Clients that need to sync
 116          * with a remote station will be the master, and an AP or GO
 117          * will be the slave.
 118          *
 119          * Depending on the new interface type it can be slaved to
 120          * or become the master of an existing interface.
 121          */
 122         switch (data->vif->type) {
 123         case NL80211_IFTYPE_STATION:
 124                 /*
 125                  * The new interface is a client, so if the one we're iterating
 126                  * is an AP, and the beacon interval of the AP is a multiple or
 127                  * divisor of the beacon interval of the client, the same TSF
 128                  * should be used to avoid drift between the new client and
 129                  * existing AP. The existing AP will get drift updates from the
 130                  * new client context in this case.
 131                  */
 132                 if (vif->type != NL80211_IFTYPE_AP ||
 133                     data->preferred_tsf != NUM_TSF_IDS ||
 134                     !test_bit(mvmvif->tsf_id, data->available_tsf_ids))
 135                         break;
 136
 137                 min_bi = min(data->vif->bss_conf.beacon_int,
 138                              vif->bss_conf.beacon_int);
 139
 140                 if (!min_bi)
 141                         break;
 142
 143                 if ((data->vif->bss_conf.beacon_int -
 144                      vif->bss_conf.beacon_int) % min_bi == 0) {
 145                         data->preferred_tsf = mvmvif->tsf_id;
 146                         return;
 147                 }
 148                 break;
 149
 150         case NL80211_IFTYPE_AP:
 151                 /*
 152                  * The new interface is AP/GO, so if its beacon interval is a
 153                  * multiple or a divisor of the beacon interval of an existing
 154                  * interface, it should get drift updates from an existing
 155                  * client or use the same TSF as an existing GO. There's no
 156                  * drift between TSFs internally but if they used different
 157                  * TSFs then a new client MAC could update one of them and
 158                  * cause drift that way.
 159                  */
 160                 if ((vif->type != NL80211_IFTYPE_AP &&
 161                      vif->type != NL80211_IFTYPE_STATION) ||
 162                     data->preferred_tsf != NUM_TSF_IDS ||
 163                     !test_bit(mvmvif->tsf_id, data->available_tsf_ids))
 164                         break;
 165
 166                 min_bi = min(data->vif->bss_conf.beacon_int,
 167                              vif->bss_conf.beacon_int);
 168
 169                 if (!min_bi)
 170                         break;
 171
 172                 if ((data->vif->bss_conf.beacon_int -
 173                      vif->bss_conf.beacon_int) % min_bi == 0) {
 174                         data->preferred_tsf = mvmvif->tsf_id;
 175                         return;
 176                 }
 177                 break;
 178         default:
 179                 /*
 180                  * For all other interface types there's no need to
 181                  * take drift into account. Either they're exclusive
 182                  * like IBSS and monitor, or we don't care much about
 183                  * their TSF (like P2P Device), but we won't be able
 184                  * to share the TSF resource.
 185                  */
 186                 break;
 187         }
 188
 189         /*
 190          * Unless we exited above, we can't share the TSF resource
 191          * that the virtual interface we're iterating over is using
 192          * with the new one, so clear the available bit and if this
 193          * was the preferred one, reset that as well.
 194          */
 195         __clear_bit(mvmvif->tsf_id, data->available_tsf_ids);
 196
 197         if (data->preferred_tsf == mvmvif->tsf_id)
 198                 data->preferred_tsf = NUM_TSF_IDS;
 199 }
 200
 201 /*
 202  * Get the mask of the queues used by the vif
 203  */
 204 u32 iwl_mvm_mac_get_queues_mask(struct ieee80211_vif *vif)
 205 {
 206         u32 qmask = 0, ac;
 207
 208         if (vif->type == NL80211_IFTYPE_P2P_DEVICE)
 209                 return BIT(IWL_MVM_OFFCHANNEL_QUEUE);
 210
 211         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
 212                 if (vif->hw_queue[ac] != IEEE80211_INVAL_HW_QUEUE)
 213                         qmask |= BIT(vif->hw_queue[ac]);
 214         }
 215
 216         if (vif->type == NL80211_IFTYPE_AP)
 217                 qmask |= BIT(vif->cab_queue);
 218
 219         return qmask;
 220 }
 221
 222 static void iwl_mvm_iface_hw_queues_iter(void *_data, u8 *mac,
 223                                          struct ieee80211_vif *vif)
 224 {
 225         struct iwl_mvm_hw_queues_iface_iterator_data *data = _data;
 226
 227         /* exclude the given vif */
 228         if (vif == data->exclude_vif)
 229                 return;
 230
 231         data->used_hw_queues |= iwl_mvm_mac_get_queues_mask(vif);
 232 }
 233
 234 static void iwl_mvm_mac_sta_hw_queues_iter(void *_data,
 235                                            struct ieee80211_sta *sta)
 236 {
 237         struct iwl_mvm_hw_queues_iface_iterator_data *data = _data;
 238         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 239
 240         /* Mark the queues used by the sta */
 241         data->used_hw_queues |= mvmsta->tfd_queue_msk;
 242 }
 243
 244 unsigned long iwl_mvm_get_used_hw_queues(struct iwl_mvm *mvm,
 245                                          struct ieee80211_vif *exclude_vif)
 246 {
 247         u8 sta_id;
 248         struct iwl_mvm_hw_queues_iface_iterator_data data = {
 249                 .exclude_vif = exclude_vif,
 250                 .used_hw_queues =
 251                         BIT(IWL_MVM_OFFCHANNEL_QUEUE) |
 252                         BIT(mvm->aux_queue) |
 253                         BIT(IWL_MVM_CMD_QUEUE),
 254         };
 255
 256         lockdep_assert_held(&mvm->mutex);
 257
 258         /* mark all VIF used hw queues */
 259         ieee80211_iterate_active_interfaces_atomic(
 260                 mvm->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
 261                 iwl_mvm_iface_hw_queues_iter, &data);
 262
 263         /* don't assign the same hw queues as TDLS stations */
 264         ieee80211_iterate_stations_atomic(mvm->hw,
 265                                           iwl_mvm_mac_sta_hw_queues_iter,
 266                                           &data);
 267
 268         /*
 269          * Some TDLS stations may be removed but are in the process of being
 270          * drained. Don't touch their queues.
 271          */
 272         for_each_set_bit(sta_id, mvm->sta_drained, IWL_MVM_STATION_COUNT)
 273                 data.used_hw_queues |= mvm->tfd_drained[sta_id];
 274
 275         return data.used_hw_queues;
 276 }
 277
 278 static void iwl_mvm_mac_iface_iterator(void *_data, u8 *mac,
 279                                        struct ieee80211_vif *vif)
 280 {
 281         struct iwl_mvm_mac_iface_iterator_data *data = _data;
 282         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 283
 284         /* Iterator may already find the interface being added -- skip it */
 285         if (vif == data->vif) {
 286                 data->found_vif = true;
 287                 return;
 288         }
 289
 290         /* Mark MAC IDs as used by clearing the available bit, and
 291          * (below) mark TSFs as used if their existing use is not
 292          * compatible with the new interface type.
 293          * No locking or atomic bit operations are needed since the
 294          * data is on the stack of the caller function.
 295          */
 296         __clear_bit(mvmvif->id, data->available_mac_ids);
 297
 298         /* find a suitable tsf_id */
 299         iwl_mvm_mac_tsf_id_iter(_data, mac, vif);
 300 }
 301
 302 void iwl_mvm_mac_ctxt_recalc_tsf_id(struct iwl_mvm *mvm,
 303                                     struct ieee80211_vif *vif)
 304 {
 305         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 306         struct iwl_mvm_mac_iface_iterator_data data = {
 307                 .mvm = mvm,
 308                 .vif = vif,
 309                 .available_tsf_ids = { (1 << NUM_TSF_IDS) - 1 },
 310                 /* no preference yet */
 311                 .preferred_tsf = NUM_TSF_IDS,
 312         };
 313
 314         ieee80211_iterate_active_interfaces_atomic(
 315                 mvm->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
 316                 iwl_mvm_mac_tsf_id_iter, &data);
 317
 318         if (data.preferred_tsf != NUM_TSF_IDS)
 319                 mvmvif->tsf_id = data.preferred_tsf;
 320         else if (!test_bit(mvmvif->tsf_id, data.available_tsf_ids))
 321                 mvmvif->tsf_id = find_first_bit(data.available_tsf_ids,
 322                                                 NUM_TSF_IDS);
 323 }
 324
 325 static int iwl_mvm_mac_ctxt_allocate_resources(struct iwl_mvm *mvm,
 326                                                struct ieee80211_vif *vif)
 327 {
 328         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 329         struct iwl_mvm_mac_iface_iterator_data data = {
 330                 .mvm = mvm,
 331                 .vif = vif,
 332                 .available_mac_ids = { (1 << NUM_MAC_INDEX_DRIVER) - 1 },
 333                 .available_tsf_ids = { (1 << NUM_TSF_IDS) - 1 },
 334                 /* no preference yet */
 335                 .preferred_tsf = NUM_TSF_IDS,
 336                 .found_vif = false,
 337         };
 338         u32 ac;
 339         int ret, i;
 340         unsigned long used_hw_queues;
 341
 342         /*
 343          * Allocate a MAC ID and a TSF for this MAC, along with the queues
 344          * and other resources.
 345          */
 346
 347         /*
 348          * Before the iterator, we start with all MAC IDs and TSFs available.
 349          *
 350          * During iteration, all MAC IDs are cleared that are in use by other
 351          * virtual interfaces, and all TSF IDs are cleared that can't be used
 352          * by this new virtual interface because they're used by an interface
 353          * that can't share it with the new one.
 354          * At the same time, we check if there's a preferred TSF in the case
 355          * that we should share it with another interface.
 356          */
 357
 358         /* Currently, MAC ID 0 should be used only for the managed/IBSS vif */
 359         switch (vif->type) {
 360         case NL80211_IFTYPE_ADHOC:
 361                 break;
 362         case NL80211_IFTYPE_STATION:
 363                 if (!vif->p2p)
 364                         break;
 365                 /* fall through */
 366         default:
 367                 __clear_bit(0, data.available_mac_ids);
 368         }
 369
 370         ieee80211_iterate_active_interfaces_atomic(
 371                 mvm->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
 372                 iwl_mvm_mac_iface_iterator, &data);
 373
 374         used_hw_queues = iwl_mvm_get_used_hw_queues(mvm, vif);
 375
 376         /*
 377          * In the case we're getting here during resume, it's similar to
 378          * firmware restart, and with RESUME_ALL the iterator will find
 379          * the vif being added already.
 380          * We don't want to reassign any IDs in either case since doing
 381          * so would probably assign different IDs (as interfaces aren't
 382          * necessarily added in the same order), but the old IDs were
 383          * preserved anyway, so skip ID assignment for both resume and
 384          * recovery.
 385          */
 386         if (data.found_vif)
 387                 return 0;
 388
 389         /* Therefore, in recovery, we can't get here */
 390         if (WARN_ON_ONCE(test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status)))
 391                 return -EBUSY;
 392
 393         mvmvif->id = find_first_bit(data.available_mac_ids,
 394                                     NUM_MAC_INDEX_DRIVER);
 395         if (mvmvif->id == NUM_MAC_INDEX_DRIVER) {
 396                 IWL_ERR(mvm, "Failed to init MAC context - no free ID!\n");
 397                 ret = -EIO;
 398                 goto exit_fail;
 399         }
 400
 401         if (data.preferred_tsf != NUM_TSF_IDS)
 402                 mvmvif->tsf_id = data.preferred_tsf;
 403         else
 404                 mvmvif->tsf_id = find_first_bit(data.available_tsf_ids,
 405                                                 NUM_TSF_IDS);
 406         if (mvmvif->tsf_id == NUM_TSF_IDS) {
 407                 IWL_ERR(mvm, "Failed to init MAC context - no free TSF!\n");
 408                 ret = -EIO;
 409                 goto exit_fail;
 410         }
 411
 412         mvmvif->color = 0;
 413
 414         INIT_LIST_HEAD(&mvmvif->time_event_data.list);
 415         mvmvif->time_event_data.id = TE_MAX;
 416
 417         /* No need to allocate data queues to P2P Device MAC.*/
 418         if (vif->type == NL80211_IFTYPE_P2P_DEVICE) {
 419                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
 420                         vif->hw_queue[ac] = IEEE80211_INVAL_HW_QUEUE;
 421
 422                 return 0;
 423         }
 424
 425         /* Find available queues, and allocate them to the ACs */
 426         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
 427                 u8 queue = find_first_zero_bit(&used_hw_queues,
 428                                                mvm->first_agg_queue);
 429
 430                 if (queue >= mvm->first_agg_queue) {
 431                         IWL_ERR(mvm, "Failed to allocate queue\n");
 432                         ret = -EIO;
 433                         goto exit_fail;
 434                 }
 435
 436                 __set_bit(queue, &used_hw_queues);
 437                 vif->hw_queue[ac] = queue;
 438         }
 439
 440         /* Allocate the CAB queue for softAP and GO interfaces */
 441         if (vif->type == NL80211_IFTYPE_AP) {
 442                 u8 queue = find_first_zero_bit(&used_hw_queues,
 443                                                mvm->first_agg_queue);
 444
 445                 if (queue >= mvm->first_agg_queue) {
 446                         IWL_ERR(mvm, "Failed to allocate cab queue\n");
 447                         ret = -EIO;
 448                         goto exit_fail;
 449                 }
 450
 451                 vif->cab_queue = queue;
 452         } else {
 453                 vif->cab_queue = IEEE80211_INVAL_HW_QUEUE;
 454         }
 455
 456         mvmvif->bcast_sta.sta_id = IWL_MVM_STATION_COUNT;
 457         mvmvif->ap_sta_id = IWL_MVM_STATION_COUNT;
 458
 459         for (i = 0; i < NUM_IWL_MVM_SMPS_REQ; i++)
 460                 mvmvif->smps_requests[i] = IEEE80211_SMPS_AUTOMATIC;
 461
 462         return 0;
 463
 464 exit_fail:
 465         memset(mvmvif, 0, sizeof(struct iwl_mvm_vif));
 466         memset(vif->hw_queue, IEEE80211_INVAL_HW_QUEUE, sizeof(vif->hw_queue));
 467         vif->cab_queue = IEEE80211_INVAL_HW_QUEUE;
 468         return ret;
 469 }
 470
 471 int iwl_mvm_mac_ctxt_init(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
 472 {
 473         unsigned int wdg_timeout = iwlmvm_mod_params.tfd_q_hang_detect ?
 474                                         mvm->cfg->base_params->wd_timeout :
 475                                         IWL_WATCHDOG_DISABLED;
 476         u32 ac;
 477         int ret;
 478
 479         lockdep_assert_held(&mvm->mutex);
 480
 481         ret = iwl_mvm_mac_ctxt_allocate_resources(mvm, vif);
 482         if (ret)
 483                 return ret;
 484
 485         switch (vif->type) {
 486         case NL80211_IFTYPE_P2P_DEVICE:
 487                 iwl_mvm_enable_ac_txq(mvm, IWL_MVM_OFFCHANNEL_QUEUE,
 488                                       IWL_MVM_TX_FIFO_VO, wdg_timeout);
 489                 break;
 490         case NL80211_IFTYPE_AP:
 491                 iwl_mvm_enable_ac_txq(mvm, vif->cab_queue,
 492                                       IWL_MVM_TX_FIFO_MCAST, wdg_timeout);
 493                 /* fall through */
 494         default:
 495                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
 496                         iwl_mvm_enable_ac_txq(mvm, vif->hw_queue[ac],
 497                                               iwl_mvm_ac_to_tx_fifo[ac],
 498                                               wdg_timeout);
 499                 break;
 500         }
 501
 502         return 0;
 503 }
 504
 505 void iwl_mvm_mac_ctxt_release(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
 506 {
 507         int ac;
 508
 509         lockdep_assert_held(&mvm->mutex);
 510
 511         switch (vif->type) {
 512         case NL80211_IFTYPE_P2P_DEVICE:
 513                 iwl_mvm_disable_txq(mvm, IWL_MVM_OFFCHANNEL_QUEUE, 0);
 514                 break;
 515         case NL80211_IFTYPE_AP:
 516                 iwl_mvm_disable_txq(mvm, vif->cab_queue, 0);
 517                 /* fall through */
 518         default:
 519                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
 520                         iwl_mvm_disable_txq(mvm, vif->hw_queue[ac], 0);
 521         }
 522 }
 523
 524 static void iwl_mvm_ack_rates(struct iwl_mvm *mvm,
 525                               struct ieee80211_vif *vif,
 526                               enum ieee80211_band band,
 527                               u8 *cck_rates, u8 *ofdm_rates)
 528 {
 529         struct ieee80211_supported_band *sband;
 530         unsigned long basic = vif->bss_conf.basic_rates;
 531         int lowest_present_ofdm = 100;
 532         int lowest_present_cck = 100;
 533         u8 cck = 0;
 534         u8 ofdm = 0;
 535         int i;
 536
 537         sband = mvm->hw->wiphy->bands[band];
 538
 539         for_each_set_bit(i, &basic, BITS_PER_LONG) {
 540                 int hw = sband->bitrates[i].hw_value;
 541                 if (hw >= IWL_FIRST_OFDM_RATE) {
 542                         ofdm |= BIT(hw - IWL_FIRST_OFDM_RATE);
 543                         if (lowest_present_ofdm > hw)
 544                                 lowest_present_ofdm = hw;
 545                 } else {
 546                         BUILD_BUG_ON(IWL_FIRST_CCK_RATE != 0);
 547
 548                         cck |= BIT(hw);
 549                         if (lowest_present_cck > hw)
 550                                 lowest_present_cck = hw;
 551                 }
 552         }
 553
 554         /*
 555          * Now we've got the basic rates as bitmaps in the ofdm and cck
 556          * variables. This isn't sufficient though, as there might not
 557          * be all the right rates in the bitmap. E.g. if the only basic
 558          * rates are 5.5 Mbps and 11 Mbps, we still need to add 1 Mbps
 559          * and 6 Mbps because the 802.11-2007 standard says in 9.6:
 560          *
 561          *    [...] a STA responding to a received frame shall transmit
 562          *    its Control Response frame [...] at the highest rate in the
 563          *    BSSBasicRateSet parameter that is less than or equal to the
 564          *    rate of the immediately previous frame in the frame exchange
 565          *    sequence ([...]) and that is of the same modulation class
 566          *    ([...]) as the received frame. If no rate contained in the
 567          *    BSSBasicRateSet parameter meets these conditions, then the
 568          *    control frame sent in response to a received frame shall be
 569          *    transmitted at the highest mandatory rate of the PHY that is
 570          *    less than or equal to the rate of the received frame, and
 571          *    that is of the same modulation class as the received frame.
 572          *
 573          * As a consequence, we need to add all mandatory rates that are
 574          * lower than all of the basic rates to these bitmaps.
 575          */
 576
 577         if (IWL_RATE_24M_INDEX < lowest_present_ofdm)
 578                 ofdm |= IWL_RATE_BIT_MSK(24) >> IWL_FIRST_OFDM_RATE;
 579         if (IWL_RATE_12M_INDEX < lowest_present_ofdm)
 580                 ofdm |= IWL_RATE_BIT_MSK(12) >> IWL_FIRST_OFDM_RATE;
 581         /* 6M already there or needed so always add */
 582         ofdm |= IWL_RATE_BIT_MSK(6) >> IWL_FIRST_OFDM_RATE;
 583
 584         /*
 585          * CCK is a bit more complex with DSSS vs. HR/DSSS vs. ERP.
 586          * Note, however:
 587          *  - if no CCK rates are basic, it must be ERP since there must
 588          *    be some basic rates at all, so they're OFDM => ERP PHY
 589          *    (or we're in 5 GHz, and the cck bitmap will never be used)
 590          *  - if 11M is a basic rate, it must be ERP as well, so add 5.5M
 591          *  - if 5.5M is basic, 1M and 2M are mandatory
 592          *  - if 2M is basic, 1M is mandatory
 593          *  - if 1M is basic, that's the only valid ACK rate.
 594          * As a consequence, it's not as complicated as it sounds, just add
 595          * any lower rates to the ACK rate bitmap.
 596          */
 597         if (IWL_RATE_11M_INDEX < lowest_present_cck)
 598                 cck |= IWL_RATE_BIT_MSK(11) >> IWL_FIRST_CCK_RATE;
 599         if (IWL_RATE_5M_INDEX < lowest_present_cck)
 600                 cck |= IWL_RATE_BIT_MSK(5) >> IWL_FIRST_CCK_RATE;
 601         if (IWL_RATE_2M_INDEX < lowest_present_cck)
 602                 cck |= IWL_RATE_BIT_MSK(2) >> IWL_FIRST_CCK_RATE;
 603         /* 1M already there or needed so always add */
 604         cck |= IWL_RATE_BIT_MSK(1) >> IWL_FIRST_CCK_RATE;
 605
 606         *cck_rates = cck;
 607         *ofdm_rates = ofdm;
 608 }
 609
 610 static void iwl_mvm_mac_ctxt_set_ht_flags(struct iwl_mvm *mvm,
 611                                          struct ieee80211_vif *vif,
 612                                          struct iwl_mac_ctx_cmd *cmd)
 613 {
 614         /* for both sta and ap, ht_operation_mode hold the protection_mode */
 615         u8 protection_mode = vif->bss_conf.ht_operation_mode &
 616                                  IEEE80211_HT_OP_MODE_PROTECTION;
 617         /* The fw does not distinguish between ht and fat */
 618         u32 ht_flag = MAC_PROT_FLG_HT_PROT | MAC_PROT_FLG_FAT_PROT;
 619
 620         IWL_DEBUG_RATE(mvm, "protection mode set to %d\n", protection_mode);
 621         /*
 622          * See section 9.23.3.1 of IEEE 80211-2012.
 623          * Nongreenfield HT STAs Present is not supported.
 624          */
 625         switch (protection_mode) {
 626         case IEEE80211_HT_OP_MODE_PROTECTION_NONE:
 627                 break;
 628         case IEEE80211_HT_OP_MODE_PROTECTION_NONMEMBER:
 629         case IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED:
 630                 cmd->protection_flags |= cpu_to_le32(ht_flag);
 631                 break;
 632         case IEEE80211_HT_OP_MODE_PROTECTION_20MHZ:
 633                 /* Protect when channel wider than 20MHz */
 634                 if (vif->bss_conf.chandef.width > NL80211_CHAN_WIDTH_20)
 635                         cmd->protection_flags |= cpu_to_le32(ht_flag);
 636                 break;
 637         default:
 638                 IWL_ERR(mvm, "Illegal protection mode %d\n",
 639                         protection_mode);
 640                 break;
 641         }
 642 }
 643
 644 static void iwl_mvm_mac_ctxt_cmd_common(struct iwl_mvm *mvm,
 645                                         struct ieee80211_vif *vif,
 646                                         struct iwl_mac_ctx_cmd *cmd,
 647                                         const u8 *bssid_override,
 648                                         u32 action)
 649 {
 650         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 651         struct ieee80211_chanctx_conf *chanctx;
 652         bool ht_enabled = !!(vif->bss_conf.ht_operation_mode &
 653                              IEEE80211_HT_OP_MODE_PROTECTION);
 654         u8 cck_ack_rates, ofdm_ack_rates;
 655         const u8 *bssid = bssid_override ?: vif->bss_conf.bssid;
 656         int i;
 657
 658         cmd->id_and_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id,
 659                                                             mvmvif->color));
 660         cmd->action = cpu_to_le32(action);
 661
 662         switch (vif->type) {
 663         case NL80211_IFTYPE_STATION:
 664                 if (vif->p2p)
 665                         cmd->mac_type = cpu_to_le32(FW_MAC_TYPE_P2P_STA);
 666                 else
 667                         cmd->mac_type = cpu_to_le32(FW_MAC_TYPE_BSS_STA);
 668                 break;
 669         case NL80211_IFTYPE_AP:
 670                 cmd->mac_type = cpu_to_le32(FW_MAC_TYPE_GO);
 671                 break;
 672         case NL80211_IFTYPE_MONITOR:
 673                 cmd->mac_type = cpu_to_le32(FW_MAC_TYPE_LISTENER);
 674                 break;
 675         case NL80211_IFTYPE_P2P_DEVICE:
 676                 cmd->mac_type = cpu_to_le32(FW_MAC_TYPE_P2P_DEVICE);
 677                 break;
 678         case NL80211_IFTYPE_ADHOC:
 679                 cmd->mac_type = cpu_to_le32(FW_MAC_TYPE_IBSS);
 680                 break;
 681         default:
 682                 WARN_ON_ONCE(1);
 683         }
 684
 685         cmd->tsf_id = cpu_to_le32(mvmvif->tsf_id);
 686
 687         memcpy(cmd->node_addr, vif->addr, ETH_ALEN);
 688
 689         if (bssid)
 690                 memcpy(cmd->bssid_addr, bssid, ETH_ALEN);
 691         else
 692                 eth_broadcast_addr(cmd->bssid_addr);
 693
 694         rcu_read_lock();
 695         chanctx = rcu_dereference(vif->chanctx_conf);
 696         iwl_mvm_ack_rates(mvm, vif, chanctx ? chanctx->def.chan->band
 697                                             : IEEE80211_BAND_2GHZ,
 698                           &cck_ack_rates, &ofdm_ack_rates);
 699         rcu_read_unlock();
 700
 701         cmd->cck_rates = cpu_to_le32((u32)cck_ack_rates);
 702         cmd->ofdm_rates = cpu_to_le32((u32)ofdm_ack_rates);
 703
 704         cmd->cck_short_preamble =
 705                 cpu_to_le32(vif->bss_conf.use_short_preamble ?
 706                             MAC_FLG_SHORT_PREAMBLE : 0);
 707         cmd->short_slot =
 708                 cpu_to_le32(vif->bss_conf.use_short_slot ?
 709                             MAC_FLG_SHORT_SLOT : 0);
 710
 711         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 712                 u8 txf = iwl_mvm_ac_to_tx_fifo[i];
 713
 714                 cmd->ac[txf].cw_min =
 715                         cpu_to_le16(mvmvif->queue_params[i].cw_min);
 716                 cmd->ac[txf].cw_max =
 717                         cpu_to_le16(mvmvif->queue_params[i].cw_max);
 718                 cmd->ac[txf].edca_txop =
 719                         cpu_to_le16(mvmvif->queue_params[i].txop * 32);
 720                 cmd->ac[txf].aifsn = mvmvif->queue_params[i].aifs;
 721                 cmd->ac[txf].fifos_mask = BIT(txf);
 722         }
 723
 724         /* in AP mode, the MCAST FIFO takes the EDCA params from VO */
 725         if (vif->type == NL80211_IFTYPE_AP)
 726                 cmd->ac[IWL_MVM_TX_FIFO_VO].fifos_mask |=
 727                         BIT(IWL_MVM_TX_FIFO_MCAST);
 728
 729         if (vif->bss_conf.qos)
 730                 cmd->qos_flags |= cpu_to_le32(MAC_QOS_FLG_UPDATE_EDCA);
 731
 732         if (vif->bss_conf.use_cts_prot)
 733                 cmd->protection_flags |= cpu_to_le32(MAC_PROT_FLG_TGG_PROTECT);
 734
 735         IWL_DEBUG_RATE(mvm, "use_cts_prot %d, ht_operation_mode %d\n",
 736                        vif->bss_conf.use_cts_prot,
 737                        vif->bss_conf.ht_operation_mode);
 738         if (vif->bss_conf.chandef.width != NL80211_CHAN_WIDTH_20_NOHT)
 739                 cmd->qos_flags |= cpu_to_le32(MAC_QOS_FLG_TGN);
 740         if (ht_enabled)
 741                 iwl_mvm_mac_ctxt_set_ht_flags(mvm, vif, cmd);
 742
 743         cmd->filter_flags = cpu_to_le32(MAC_FILTER_ACCEPT_GRP);
 744 }
 745
 746 static int iwl_mvm_mac_ctxt_send_cmd(struct iwl_mvm *mvm,
 747                                      struct iwl_mac_ctx_cmd *cmd)
 748 {
 749         int ret = iwl_mvm_send_cmd_pdu(mvm, MAC_CONTEXT_CMD, 0,
 750                                        sizeof(*cmd), cmd);
 751         if (ret)
 752                 IWL_ERR(mvm, "Failed to send MAC context (action:%d): %d\n",
 753                         le32_to_cpu(cmd->action), ret);
 754         return ret;
 755 }
 756
 757 static int iwl_mvm_mac_ctxt_cmd_sta(struct iwl_mvm *mvm,
 758                                     struct ieee80211_vif *vif,
 759                                     u32 action, bool force_assoc_off,
 760                                     const u8 *bssid_override)
 761 {
 762         struct iwl_mac_ctx_cmd cmd = {};
 763         struct iwl_mac_data_sta *ctxt_sta;
 764
 765         WARN_ON(vif->type != NL80211_IFTYPE_STATION);
 766
 767         /* Fill the common data for all mac context types */
 768         iwl_mvm_mac_ctxt_cmd_common(mvm, vif, &cmd, bssid_override, action);
 769
 770         if (vif->p2p) {
 771                 struct ieee80211_p2p_noa_attr *noa =
 772                         &vif->bss_conf.p2p_noa_attr;
 773
 774                 cmd.p2p_sta.ctwin = cpu_to_le32(noa->oppps_ctwindow &
 775                                         IEEE80211_P2P_OPPPS_CTWINDOW_MASK);
 776                 ctxt_sta = &cmd.p2p_sta.sta;
 777         } else {
 778                 ctxt_sta = &cmd.sta;
 779         }
 780
 781         /* We need the dtim_period to set the MAC as associated */
 782         if (vif->bss_conf.assoc && vif->bss_conf.dtim_period &&
 783             !force_assoc_off) {
 784                 u32 dtim_offs;
 785
 786                 /*
 787                  * The DTIM count counts down, so when it is N that means N
 788                  * more beacon intervals happen until the DTIM TBTT. Therefore
 789                  * add this to the current time. If that ends up being in the
 790                  * future, the firmware will handle it.
 791                  *
 792                  * Also note that the system_timestamp (which we get here as
 793                  * "sync_device_ts") and TSF timestamp aren't at exactly the
 794                  * same offset in the frame -- the TSF is at the first symbol
 795                  * of the TSF, the system timestamp is at signal acquisition
 796                  * time. This means there's an offset between them of at most
 797                  * a few hundred microseconds (24 * 8 bits + PLCP time gives
 798                  * 384us in the longest case), this is currently not relevant
 799                  * as the firmware wakes up around 2ms before the TBTT.
 800                  */
 801                 dtim_offs = vif->bss_conf.sync_dtim_count *
 802                                 vif->bss_conf.beacon_int;
 803                 /* convert TU to usecs */
 804                 dtim_offs *= 1024;
 805
 806                 ctxt_sta->dtim_tsf =
 807                         cpu_to_le64(vif->bss_conf.sync_tsf + dtim_offs);
 808                 ctxt_sta->dtim_time =
 809                         cpu_to_le32(vif->bss_conf.sync_device_ts + dtim_offs);
 810
 811                 IWL_DEBUG_INFO(mvm, "DTIM TBTT is 0x%llx/0x%x, offset %d\n",
 812                                le64_to_cpu(ctxt_sta->dtim_tsf),
 813                                le32_to_cpu(ctxt_sta->dtim_time),
 814                                dtim_offs);
 815
 816                 ctxt_sta->is_assoc = cpu_to_le32(1);
 817         } else {
 818                 ctxt_sta->is_assoc = cpu_to_le32(0);
 819
 820                 /* Allow beacons to pass through as long as we are not
 821                  * associated, or we do not have dtim period information.
 822                  */
 823                 cmd.filter_flags |= cpu_to_le32(MAC_FILTER_IN_BEACON);
 824         }
 825
 826         ctxt_sta->bi = cpu_to_le32(vif->bss_conf.beacon_int);
 827         ctxt_sta->bi_reciprocal =
 828                 cpu_to_le32(iwl_mvm_reciprocal(vif->bss_conf.beacon_int));
 829         ctxt_sta->dtim_interval = cpu_to_le32(vif->bss_conf.beacon_int *
 830                                               vif->bss_conf.dtim_period);
 831         ctxt_sta->dtim_reciprocal =
 832                 cpu_to_le32(iwl_mvm_reciprocal(vif->bss_conf.beacon_int *
 833                                                vif->bss_conf.dtim_period));
 834
 835         ctxt_sta->listen_interval = cpu_to_le32(mvm->hw->conf.listen_interval);
 836         ctxt_sta->assoc_id = cpu_to_le32(vif->bss_conf.aid);
 837
 838         return iwl_mvm_mac_ctxt_send_cmd(mvm, &cmd);
 839 }
 840
 841 static int iwl_mvm_mac_ctxt_cmd_listener(struct iwl_mvm *mvm,
 842                                          struct ieee80211_vif *vif,
 843                                          u32 action)
 844 {
 845         struct iwl_mac_ctx_cmd cmd = {};
 846
 847         WARN_ON(vif->type != NL80211_IFTYPE_MONITOR);
 848
 849         iwl_mvm_mac_ctxt_cmd_common(mvm, vif, &cmd, NULL, action);
 850
 851         cmd.filter_flags = cpu_to_le32(MAC_FILTER_IN_PROMISC |
 852                                        MAC_FILTER_IN_CONTROL_AND_MGMT |
 853                                        MAC_FILTER_IN_BEACON |
 854                                        MAC_FILTER_IN_PROBE_REQUEST |
 855                                        MAC_FILTER_IN_CRC32);
 856         mvm->hw->flags |= IEEE80211_HW_RX_INCLUDES_FCS;
 857
 858         return iwl_mvm_mac_ctxt_send_cmd(mvm, &cmd);
 859 }
 860
 861 static int iwl_mvm_mac_ctxt_cmd_ibss(struct iwl_mvm *mvm,
 862                                      struct ieee80211_vif *vif,
 863                                      u32 action)
 864 {
 865         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 866         struct iwl_mac_ctx_cmd cmd = {};
 867
 868         WARN_ON(vif->type != NL80211_IFTYPE_ADHOC);
 869
 870         iwl_mvm_mac_ctxt_cmd_common(mvm, vif, &cmd, NULL, action);
 871
 872         cmd.filter_flags = cpu_to_le32(MAC_FILTER_IN_BEACON |
 873                                        MAC_FILTER_IN_PROBE_REQUEST);
 874
 875         /* cmd.ibss.beacon_time/cmd.ibss.beacon_tsf are curently ignored */
 876         cmd.ibss.bi = cpu_to_le32(vif->bss_conf.beacon_int);
 877         cmd.ibss.bi_reciprocal =
 878                 cpu_to_le32(iwl_mvm_reciprocal(vif->bss_conf.beacon_int));
 879
 880         /* TODO: Assumes that the beacon id == mac context id */
 881         cmd.ibss.beacon_template = cpu_to_le32(mvmvif->id);
 882
 883         return iwl_mvm_mac_ctxt_send_cmd(mvm, &cmd);
 884 }
 885
 886 struct iwl_mvm_go_iterator_data {
 887         bool go_active;
 888 };
 889
 890 static void iwl_mvm_go_iterator(void *_data, u8 *mac, struct ieee80211_vif *vif)
 891 {
 892         struct iwl_mvm_go_iterator_data *data = _data;
 893         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 894
 895         if (vif->type == NL80211_IFTYPE_AP && vif->p2p &&
 896             mvmvif->ap_ibss_active)
 897                 data->go_active = true;
 898 }
 899
 900 static int iwl_mvm_mac_ctxt_cmd_p2p_device(struct iwl_mvm *mvm,
 901                                            struct ieee80211_vif *vif,
 902                                            u32 action)
 903 {
 904         struct iwl_mac_ctx_cmd cmd = {};
 905         struct iwl_mvm_go_iterator_data data = {};
 906
 907         WARN_ON(vif->type != NL80211_IFTYPE_P2P_DEVICE);
 908
 909         iwl_mvm_mac_ctxt_cmd_common(mvm, vif, &cmd, NULL, action);
 910
 911         cmd.protection_flags |= cpu_to_le32(MAC_PROT_FLG_TGG_PROTECT);
 912
 913         /* Override the filter flags to accept only probe requests */
 914         cmd.filter_flags = cpu_to_le32(MAC_FILTER_IN_PROBE_REQUEST);
 915
 916         /*
 917          * This flag should be set to true when the P2P Device is
 918          * discoverable and there is at least another active P2P GO. Settings
 919          * this flag will allow the P2P Device to be discoverable on other
 920          * channels in addition to its listen channel.
 921          * Note that this flag should not be set in other cases as it opens the
 922          * Rx filters on all MAC and increases the number of interrupts.
 923          */
 924         ieee80211_iterate_active_interfaces_atomic(
 925                 mvm->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
 926                 iwl_mvm_go_iterator, &data);
 927
 928         cmd.p2p_dev.is_disc_extended = cpu_to_le32(data.go_active ? 1 : 0);
 929         return iwl_mvm_mac_ctxt_send_cmd(mvm, &cmd);
 930 }
 931
 932 static void iwl_mvm_mac_ctxt_set_tim(struct iwl_mvm *mvm,
 933                                      struct iwl_mac_beacon_cmd *beacon_cmd,
 934                                      u8 *beacon, u32 frame_size)
 935 {
 936         u32 tim_idx;
 937         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)beacon;
 938
 939         /* The index is relative to frame start but we start looking at the
 940          * variable-length part of the beacon. */
 941         tim_idx = mgmt->u.beacon.variable - beacon;
 942
 943         /* Parse variable-length elements of beacon to find WLAN_EID_TIM */
 944         while ((tim_idx < (frame_size - 2)) &&
 945                         (beacon[tim_idx] != WLAN_EID_TIM))
 946                 tim_idx += beacon[tim_idx+1] + 2;
 947
 948         /* If TIM field was found, set variables */
 949         if ((tim_idx < (frame_size - 1)) && (beacon[tim_idx] == WLAN_EID_TIM)) {
 950                 beacon_cmd->tim_idx = cpu_to_le32(tim_idx);
 951                 beacon_cmd->tim_size = cpu_to_le32((u32)beacon[tim_idx+1]);
 952         } else {
 953                 IWL_WARN(mvm, "Unable to find TIM Element in beacon\n");
 954         }
 955 }
 956
 957 static int iwl_mvm_mac_ctxt_send_beacon(struct iwl_mvm *mvm,
 958                                         struct ieee80211_vif *vif,
 959                                         struct sk_buff *beacon)
 960 {
 961         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 962         struct iwl_host_cmd cmd = {
 963                 .id = BEACON_TEMPLATE_CMD,
 964                 .flags = CMD_ASYNC,
 965         };
 966         struct iwl_mac_beacon_cmd beacon_cmd = {};
 967         struct ieee80211_tx_info *info;
 968         u32 beacon_skb_len;
 969         u32 rate, tx_flags;
 970
 971         if (WARN_ON(!beacon))
 972                 return -EINVAL;
 973
 974         beacon_skb_len = beacon->len;
 975
 976         /* TODO: for now the beacon template id is set to be the mac context id.
 977          * Might be better to handle it as another resource ... */
 978         beacon_cmd.template_id = cpu_to_le32((u32)mvmvif->id);
 979         info = IEEE80211_SKB_CB(beacon);
 980
 981         /* Set up TX command fields */
 982         beacon_cmd.tx.len = cpu_to_le16((u16)beacon_skb_len);
 983         beacon_cmd.tx.sta_id = mvmvif->bcast_sta.sta_id;
 984         beacon_cmd.tx.life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
 985         tx_flags = TX_CMD_FLG_SEQ_CTL | TX_CMD_FLG_TSF;
 986         tx_flags |=
 987                 iwl_mvm_bt_coex_tx_prio(mvm, (void *)beacon->data, info, 0) <<
 988                                                 TX_CMD_FLG_BT_PRIO_POS;
 989         beacon_cmd.tx.tx_flags = cpu_to_le32(tx_flags);
 990
 991         mvm->mgmt_last_antenna_idx =
 992                 iwl_mvm_next_antenna(mvm, iwl_mvm_get_valid_tx_ant(mvm),
 993                                      mvm->mgmt_last_antenna_idx);
 994
 995         beacon_cmd.tx.rate_n_flags =
 996                 cpu_to_le32(BIT(mvm->mgmt_last_antenna_idx) <<
 997                             RATE_MCS_ANT_POS);
 998
 999         if (info->band == IEEE80211_BAND_5GHZ || vif->p2p) {
1000                 rate = IWL_FIRST_OFDM_RATE;
1001         } else {
1002                 rate = IWL_FIRST_CCK_RATE;
1003                 beacon_cmd.tx.rate_n_flags |= cpu_to_le32(RATE_MCS_CCK_MSK);
1004         }
1005         beacon_cmd.tx.rate_n_flags |=
1006                 cpu_to_le32(iwl_mvm_mac80211_idx_to_hwrate(rate));
1007
1008         /* Set up TX beacon command fields */
1009         if (vif->type == NL80211_IFTYPE_AP)
1010                 iwl_mvm_mac_ctxt_set_tim(mvm, &beacon_cmd,
1011                                          beacon->data,
1012                                          beacon_skb_len);
1013
1014         /* Submit command */
1015         cmd.len[0] = sizeof(beacon_cmd);
1016         cmd.data[0] = &beacon_cmd;
1017         cmd.dataflags[0] = 0;
1018         cmd.len[1] = beacon_skb_len;
1019         cmd.data[1] = beacon->data;
1020         cmd.dataflags[1] = IWL_HCMD_DFL_DUP;
1021
1022         return iwl_mvm_send_cmd(mvm, &cmd);
1023 }
1024
1025 /* The beacon template for the AP/GO/IBSS has changed and needs update */
1026 int iwl_mvm_mac_ctxt_beacon_changed(struct iwl_mvm *mvm,
1027                                     struct ieee80211_vif *vif)
1028 {
1029         struct sk_buff *beacon;
1030         int ret;
1031
1032         WARN_ON(vif->type != NL80211_IFTYPE_AP &&
1033                 vif->type != NL80211_IFTYPE_ADHOC);
1034
1035         beacon = ieee80211_beacon_get_template(mvm->hw, vif, NULL);
1036         if (!beacon)
1037                 return -ENOMEM;
1038
1039         ret = iwl_mvm_mac_ctxt_send_beacon(mvm, vif, beacon);
1040         dev_kfree_skb(beacon);
1041         return ret;
1042 }
1043
1044 struct iwl_mvm_mac_ap_iterator_data {
1045         struct iwl_mvm *mvm;
1046         struct ieee80211_vif *vif;
1047         u32 beacon_device_ts;
1048         u16 beacon_int;
1049 };
1050
1051 /* Find the beacon_device_ts and beacon_int for a managed interface */
1052 static void iwl_mvm_mac_ap_iterator(void *_data, u8 *mac,
1053                                     struct ieee80211_vif *vif)
1054 {
1055         struct iwl_mvm_mac_ap_iterator_data *data = _data;
1056
1057         if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc)
1058                 return;
1059
1060         /* Station client has higher priority over P2P client*/
1061         if (vif->p2p && data->beacon_device_ts)
1062                 return;
1063
1064         data->beacon_device_ts = vif->bss_conf.sync_device_ts;
1065         data->beacon_int = vif->bss_conf.beacon_int;
1066 }
1067
1068 /*
1069  * Fill the specific data for mac context of type AP of P2P GO
1070  */
1071 static void iwl_mvm_mac_ctxt_cmd_fill_ap(struct iwl_mvm *mvm,
1072                                          struct ieee80211_vif *vif,
1073                                          struct iwl_mac_data_ap *ctxt_ap,
1074                                          bool add)
1075 {
1076         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
1077         struct iwl_mvm_mac_ap_iterator_data data = {
1078                 .mvm = mvm,
1079                 .vif = vif,
1080                 .beacon_device_ts = 0
1081         };
1082
1083         ctxt_ap->bi = cpu_to_le32(vif->bss_conf.beacon_int);
1084         ctxt_ap->bi_reciprocal =
1085                 cpu_to_le32(iwl_mvm_reciprocal(vif->bss_conf.beacon_int));
1086         ctxt_ap->dtim_interval = cpu_to_le32(vif->bss_conf.beacon_int *
1087                                              vif->bss_conf.dtim_period);
1088         ctxt_ap->dtim_reciprocal =
1089                 cpu_to_le32(iwl_mvm_reciprocal(vif->bss_conf.beacon_int *
1090                                                vif->bss_conf.dtim_period));
1091
1092         ctxt_ap->mcast_qid = cpu_to_le32(vif->cab_queue);
1093
1094         /*
1095          * Only set the beacon time when the MAC is being added, when we
1096          * just modify the MAC then we should keep the time -- the firmware
1097          * can otherwise have a "jumping" TBTT.
1098          */
1099         if (add) {
1100                 /*
1101                  * If there is a station/P2P client interface which is
1102                  * associated, set the AP's TBTT far enough from the station's
1103                  * TBTT. Otherwise, set it to the current system time
1104                  */
1105                 ieee80211_iterate_active_interfaces_atomic(
1106                         mvm->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
1107                         iwl_mvm_mac_ap_iterator, &data);
1108
1109                 if (data.beacon_device_ts) {
1110                         u32 rand = (prandom_u32() % (64 - 36)) + 36;
1111                         mvmvif->ap_beacon_time = data.beacon_device_ts +
1112                                 ieee80211_tu_to_usec(data.beacon_int * rand /
1113                                                      100);
1114                 } else {
1115                         mvmvif->ap_beacon_time =
1116                                 iwl_read_prph(mvm->trans,
1117                                               DEVICE_SYSTEM_TIME_REG);
1118                 }
1119         }
1120
1121         ctxt_ap->beacon_time = cpu_to_le32(mvmvif->ap_beacon_time);
1122         ctxt_ap->beacon_tsf = 0; /* unused */
1123
1124         /* TODO: Assume that the beacon id == mac context id */
1125         ctxt_ap->beacon_template = cpu_to_le32(mvmvif->id);
1126 }
1127
1128 static int iwl_mvm_mac_ctxt_cmd_ap(struct iwl_mvm *mvm,
1129                                    struct ieee80211_vif *vif,
1130                                    u32 action)
1131 {
1132         struct iwl_mac_ctx_cmd cmd = {};
1133
1134         WARN_ON(vif->type != NL80211_IFTYPE_AP || vif->p2p);
1135
1136         /* Fill the common data for all mac context types */
1137         iwl_mvm_mac_ctxt_cmd_common(mvm, vif, &cmd, NULL, action);
1138
1139         /*
1140          * pass probe requests and beacons from other APs (needed
1141          * for ht protection)
1142          */
1143         cmd.filter_flags |= cpu_to_le32(MAC_FILTER_IN_PROBE_REQUEST |
1144                                         MAC_FILTER_IN_BEACON);
1145
1146         /* Fill the data specific for ap mode */
1147         iwl_mvm_mac_ctxt_cmd_fill_ap(mvm, vif, &cmd.ap,
1148                                      action == FW_CTXT_ACTION_ADD);
1149
1150         return iwl_mvm_mac_ctxt_send_cmd(mvm, &cmd);
1151 }
1152
1153 static int iwl_mvm_mac_ctxt_cmd_go(struct iwl_mvm *mvm,
1154                                    struct ieee80211_vif *vif,
1155                                    u32 action)
1156 {
1157         struct iwl_mac_ctx_cmd cmd = {};
1158         struct ieee80211_p2p_noa_attr *noa = &vif->bss_conf.p2p_noa_attr;
1159
1160         WARN_ON(vif->type != NL80211_IFTYPE_AP || !vif->p2p);
1161
1162         /* Fill the common data for all mac context types */
1163         iwl_mvm_mac_ctxt_cmd_common(mvm, vif, &cmd, NULL, action);
1164
1165         /*
1166          * pass probe requests and beacons from other APs (needed
1167          * for ht protection)
1168          */
1169         cmd.filter_flags |= cpu_to_le32(MAC_FILTER_IN_PROBE_REQUEST |
1170                                         MAC_FILTER_IN_BEACON);
1171
1172         /* Fill the data specific for GO mode */
1173         iwl_mvm_mac_ctxt_cmd_fill_ap(mvm, vif, &cmd.go.ap,
1174                                      action == FW_CTXT_ACTION_ADD);
1175
1176         cmd.go.ctwin = cpu_to_le32(noa->oppps_ctwindow &
1177                                         IEEE80211_P2P_OPPPS_CTWINDOW_MASK);
1178         cmd.go.opp_ps_enabled =
1179                         cpu_to_le32(!!(noa->oppps_ctwindow &
1180                                         IEEE80211_P2P_OPPPS_ENABLE_BIT));
1181
1182         return iwl_mvm_mac_ctxt_send_cmd(mvm, &cmd);
1183 }
1184
1185 static int iwl_mvm_mac_ctx_send(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1186                                 u32 action, bool force_assoc_off,
1187                                 const u8 *bssid_override)
1188 {
1189         switch (vif->type) {
1190         case NL80211_IFTYPE_STATION:
1191                 return iwl_mvm_mac_ctxt_cmd_sta(mvm, vif, action,
1192                                                 force_assoc_off,
1193                                                 bssid_override);
1194                 break;
1195         case NL80211_IFTYPE_AP:
1196                 if (!vif->p2p)
1197                         return iwl_mvm_mac_ctxt_cmd_ap(mvm, vif, action);
1198                 else
1199                         return iwl_mvm_mac_ctxt_cmd_go(mvm, vif, action);
1200                 break;
1201         case NL80211_IFTYPE_MONITOR:
1202                 return iwl_mvm_mac_ctxt_cmd_listener(mvm, vif, action);
1203         case NL80211_IFTYPE_P2P_DEVICE:
1204                 return iwl_mvm_mac_ctxt_cmd_p2p_device(mvm, vif, action);
1205         case NL80211_IFTYPE_ADHOC:
1206                 return iwl_mvm_mac_ctxt_cmd_ibss(mvm, vif, action);
1207         default:
1208                 break;
1209         }
1210
1211         return -EOPNOTSUPP;
1212 }
1213
1214 int iwl_mvm_mac_ctxt_add(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
1215 {
1216         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
1217         int ret;
1218
1219         if (WARN_ONCE(mvmvif->uploaded, "Adding active MAC %pM/%d\n",
1220                       vif->addr, ieee80211_vif_type_p2p(vif)))
1221                 return -EIO;
1222
1223         ret = iwl_mvm_mac_ctx_send(mvm, vif, FW_CTXT_ACTION_ADD,
1224                                    true, NULL);
1225         if (ret)
1226                 return ret;
1227
1228         /* will only do anything at resume from D3 time */
1229         iwl_mvm_set_last_nonqos_seq(mvm, vif);
1230
1231         mvmvif->uploaded = true;
1232         return 0;
1233 }
1234
1235 int iwl_mvm_mac_ctxt_changed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1236                              bool force_assoc_off, const u8 *bssid_override)
1237 {
1238         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
1239
1240         if (WARN_ONCE(!mvmvif->uploaded, "Changing inactive MAC %pM/%d\n",
1241                       vif->addr, ieee80211_vif_type_p2p(vif)))
1242                 return -EIO;
1243
1244         return iwl_mvm_mac_ctx_send(mvm, vif, FW_CTXT_ACTION_MODIFY,
1245                                     force_assoc_off, bssid_override);
1246 }
1247
1248 int iwl_mvm_mac_ctxt_remove(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
1249 {
1250         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
1251         struct iwl_mac_ctx_cmd cmd;
1252         int ret;
1253
1254         if (WARN_ONCE(!mvmvif->uploaded, "Removing inactive MAC %pM/%d\n",
1255                       vif->addr, ieee80211_vif_type_p2p(vif)))
1256                 return -EIO;
1257
1258         memset(&cmd, 0, sizeof(cmd));
1259
1260         cmd.id_and_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id,
1261                                                            mvmvif->color));
1262         cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE);
1263
1264         ret = iwl_mvm_send_cmd_pdu(mvm, MAC_CONTEXT_CMD, 0,
1265                                    sizeof(cmd), &cmd);
1266         if (ret) {
1267                 IWL_ERR(mvm, "Failed to remove MAC context: %d\n", ret);
1268                 return ret;
1269         }
1270
1271         mvmvif->uploaded = false;
1272
1273         if (vif->type == NL80211_IFTYPE_MONITOR)
1274                 mvm->hw->flags &= ~IEEE80211_HW_RX_INCLUDES_FCS;
1275
1276         return 0;
1277 }
1278
1279 static void iwl_mvm_csa_count_down(struct iwl_mvm *mvm,
1280                                    struct ieee80211_vif *csa_vif, u32 gp2,
1281                                    bool tx_success)
1282 {
1283         struct iwl_mvm_vif *mvmvif =
1284                         iwl_mvm_vif_from_mac80211(csa_vif);
1285
1286         /* Don't start to countdown from a failed beacon */
1287         if (!tx_success && !mvmvif->csa_countdown)
1288                 return;
1289
1290         mvmvif->csa_countdown = true;
1291
1292         if (!ieee80211_csa_is_complete(csa_vif)) {
1293                 int c = ieee80211_csa_update_counter(csa_vif);
1294
1295                 iwl_mvm_mac_ctxt_beacon_changed(mvm, csa_vif);
1296                 if (csa_vif->p2p &&
1297                     !iwl_mvm_te_scheduled(&mvmvif->time_event_data) && gp2 &&
1298                     tx_success) {
1299                         u32 rel_time = (c + 1) *
1300                                        csa_vif->bss_conf.beacon_int -
1301                                        IWL_MVM_CHANNEL_SWITCH_TIME_GO;
1302                         u32 apply_time = gp2 + rel_time * 1024;
1303
1304                         iwl_mvm_schedule_csa_period(mvm, csa_vif,
1305                                          IWL_MVM_CHANNEL_SWITCH_TIME_GO -
1306                                          IWL_MVM_CHANNEL_SWITCH_MARGIN,
1307                                          apply_time);
1308                 }
1309         } else if (!iwl_mvm_te_scheduled(&mvmvif->time_event_data)) {
1310                 /* we don't have CSA NoA scheduled yet, switch now */
1311                 ieee80211_csa_finish(csa_vif);
1312                 RCU_INIT_POINTER(mvm->csa_vif, NULL);
1313         }
1314 }
1315
1316 int iwl_mvm_rx_beacon_notif(struct iwl_mvm *mvm,
1317                             struct iwl_rx_cmd_buffer *rxb,
1318                             struct iwl_device_cmd *cmd)
1319 {
1320         struct iwl_rx_packet *pkt = rxb_addr(rxb);
1321         struct iwl_extended_beacon_notif *beacon = (void *)pkt->data;
1322         struct iwl_mvm_tx_resp *beacon_notify_hdr;
1323         struct ieee80211_vif *csa_vif;
1324         struct ieee80211_vif *tx_blocked_vif;
1325         u16 status;
1326
1327         lockdep_assert_held(&mvm->mutex);
1328
1329         beacon_notify_hdr = &beacon->beacon_notify_hdr;
1330         mvm->ap_last_beacon_gp2 = le32_to_cpu(beacon->gp2);
1331
1332         status = le16_to_cpu(beacon_notify_hdr->status.status) & TX_STATUS_MSK;
1333         IWL_DEBUG_RX(mvm,
1334                      "beacon status %#x retries:%d tsf:0x%16llX gp2:0x%X rate:%d\n",
1335                      status, beacon_notify_hdr->failure_frame,
1336                      le64_to_cpu(beacon->tsf),
1337                      mvm->ap_last_beacon_gp2,
1338                      le32_to_cpu(beacon_notify_hdr->initial_rate));
1339
1340         csa_vif = rcu_dereference_protected(mvm->csa_vif,
1341                                             lockdep_is_held(&mvm->mutex));
1342         if (unlikely(csa_vif && csa_vif->csa_active))
1343                 iwl_mvm_csa_count_down(mvm, csa_vif, mvm->ap_last_beacon_gp2,
1344                                        (status == TX_STATUS_SUCCESS));
1345
1346         tx_blocked_vif = rcu_dereference_protected(mvm->csa_tx_blocked_vif,
1347                                                 lockdep_is_held(&mvm->mutex));
1348         if (unlikely(tx_blocked_vif)) {
1349                 struct iwl_mvm_vif *mvmvif =
1350                         iwl_mvm_vif_from_mac80211(tx_blocked_vif);
1351
1352                 /*
1353                  * The channel switch is started and we have blocked the
1354                  * stations. If this is the first beacon (the timeout wasn't
1355                  * set), set the unblock timeout, otherwise countdown
1356                  */
1357                 if (!mvm->csa_tx_block_bcn_timeout)
1358                         mvm->csa_tx_block_bcn_timeout =
1359                                 IWL_MVM_CS_UNBLOCK_TX_TIMEOUT;
1360                 else
1361                         mvm->csa_tx_block_bcn_timeout--;
1362
1363                 /* Check if the timeout is expired, and unblock tx */
1364                 if (mvm->csa_tx_block_bcn_timeout == 0) {
1365                         iwl_mvm_modify_all_sta_disable_tx(mvm, mvmvif, false);
1366                         RCU_INIT_POINTER(mvm->csa_tx_blocked_vif, NULL);
1367                 }
1368         }
1369
1370         return 0;
1371 }
1372
1373 static void iwl_mvm_beacon_loss_iterator(void *_data, u8 *mac,
1374                                          struct ieee80211_vif *vif)
1375 {
1376         struct iwl_missed_beacons_notif *missed_beacons = _data;
1377         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
1378         struct iwl_mvm *mvm = mvmvif->mvm;
1379         struct iwl_fw_dbg_trigger_missed_bcon *bcon_trig;
1380         struct iwl_fw_dbg_trigger_tlv *trigger;
1381         u32 stop_trig_missed_bcon, stop_trig_missed_bcon_since_rx;
1382         u32 rx_missed_bcon, rx_missed_bcon_since_rx;
1383
1384         if (mvmvif->id != (u16)le32_to_cpu(missed_beacons->mac_id))
1385                 return;
1386
1387         rx_missed_bcon = le32_to_cpu(missed_beacons->consec_missed_beacons);
1388         rx_missed_bcon_since_rx =
1389                 le32_to_cpu(missed_beacons->consec_missed_beacons_since_last_rx);
1390         /*
1391          * TODO: the threshold should be adjusted based on latency conditions,
1392          * and/or in case of a CS flow on one of the other AP vifs.
1393          */
1394         if (le32_to_cpu(missed_beacons->consec_missed_beacons_since_last_rx) >
1395              IWL_MVM_MISSED_BEACONS_THRESHOLD)
1396                 ieee80211_beacon_loss(vif);
1397
1398         if (!iwl_fw_dbg_trigger_enabled(mvm->fw,
1399                                         FW_DBG_TRIGGER_MISSED_BEACONS))
1400                 return;
1401
1402         trigger = iwl_fw_dbg_get_trigger(mvm->fw,
1403                                          FW_DBG_TRIGGER_MISSED_BEACONS);
1404         bcon_trig = (void *)trigger->data;
1405         stop_trig_missed_bcon = le32_to_cpu(bcon_trig->stop_consec_missed_bcon);
1406         stop_trig_missed_bcon_since_rx =
1407                 le32_to_cpu(bcon_trig->stop_consec_missed_bcon_since_rx);
1408
1409         /* TODO: implement start trigger */
1410
1411         if (!iwl_fw_dbg_trigger_check_stop(mvm, vif, trigger))
1412                 return;
1413
1414         if (rx_missed_bcon_since_rx >= stop_trig_missed_bcon_since_rx ||
1415             rx_missed_bcon >= stop_trig_missed_bcon)
1416                 iwl_mvm_fw_dbg_collect_trig(mvm, trigger, NULL, 0);
1417 }
1418
1419 int iwl_mvm_rx_missed_beacons_notif(struct iwl_mvm *mvm,
1420                                     struct iwl_rx_cmd_buffer *rxb,
1421                                     struct iwl_device_cmd *cmd)
1422 {
1423         struct iwl_rx_packet *pkt = rxb_addr(rxb);
1424         struct iwl_missed_beacons_notif *mb = (void *)pkt->data;
1425
1426         IWL_DEBUG_INFO(mvm,
1427                        "missed bcn mac_id=%u, consecutive=%u (%u, %u, %u)\n",
1428                        le32_to_cpu(mb->mac_id),
1429                        le32_to_cpu(mb->consec_missed_beacons),
1430                        le32_to_cpu(mb->consec_missed_beacons_since_last_rx),
1431                        le32_to_cpu(mb->num_recvd_beacons),
1432                        le32_to_cpu(mb->num_expected_beacons));
1433
1434         ieee80211_iterate_active_interfaces_atomic(mvm->hw,
1435                                                    IEEE80211_IFACE_ITER_NORMAL,
1436                                                    iwl_mvm_beacon_loss_iterator,
1437                                                    mb);
1438         return 0;
1439 }