kernel/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  *
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  21  * along with this program; if not, write to the Free Software
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  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.
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  39  * modification, are permitted provided that the following conditions
  40  * are met:
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  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.
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  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
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  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 =
 474                 iwl_mvm_get_wd_timeout(mvm, vif, false, false);
 475         u32 ac;
 476         int ret;
 477
 478         lockdep_assert_held(&mvm->mutex);
 479
 480         ret = iwl_mvm_mac_ctxt_allocate_resources(mvm, vif);
 481         if (ret)
 482                 return ret;
 483
 484         switch (vif->type) {
 485         case NL80211_IFTYPE_P2P_DEVICE:
 486                 iwl_mvm_enable_ac_txq(mvm, IWL_MVM_OFFCHANNEL_QUEUE,
 487                                       IWL_MVM_TX_FIFO_VO, wdg_timeout);
 488                 break;
 489         case NL80211_IFTYPE_AP:
 490                 iwl_mvm_enable_ac_txq(mvm, vif->cab_queue,
 491                                       IWL_MVM_TX_FIFO_MCAST, wdg_timeout);
 492                 /* fall through */
 493         default:
 494                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
 495                         iwl_mvm_enable_ac_txq(mvm, vif->hw_queue[ac],
 496                                               iwl_mvm_ac_to_tx_fifo[ac],
 497                                               wdg_timeout);
 498                 break;
 499         }
 500
 501         return 0;
 502 }
 503
 504 void iwl_mvm_mac_ctxt_release(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
 505 {
 506         int ac;
 507
 508         lockdep_assert_held(&mvm->mutex);
 509
 510         switch (vif->type) {
 511         case NL80211_IFTYPE_P2P_DEVICE:
 512                 iwl_mvm_disable_txq(mvm, IWL_MVM_OFFCHANNEL_QUEUE, 0);
 513                 break;
 514         case NL80211_IFTYPE_AP:
 515                 iwl_mvm_disable_txq(mvm, vif->cab_queue, 0);
 516                 /* fall through */
 517         default:
 518                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
 519                         iwl_mvm_disable_txq(mvm, vif->hw_queue[ac], 0);
 520         }
 521 }
 522
 523 static void iwl_mvm_ack_rates(struct iwl_mvm *mvm,
 524                               struct ieee80211_vif *vif,
 525                               enum ieee80211_band band,
 526                               u8 *cck_rates, u8 *ofdm_rates)
 527 {
 528         struct ieee80211_supported_band *sband;
 529         unsigned long basic = vif->bss_conf.basic_rates;
 530         int lowest_present_ofdm = 100;
 531         int lowest_present_cck = 100;
 532         u8 cck = 0;
 533         u8 ofdm = 0;
 534         int i;
 535
 536         sband = mvm->hw->wiphy->bands[band];
 537
 538         for_each_set_bit(i, &basic, BITS_PER_LONG) {
 539                 int hw = sband->bitrates[i].hw_value;
 540                 if (hw >= IWL_FIRST_OFDM_RATE) {
 541                         ofdm |= BIT(hw - IWL_FIRST_OFDM_RATE);
 542                         if (lowest_present_ofdm > hw)
 543                                 lowest_present_ofdm = hw;
 544                 } else {
 545                         BUILD_BUG_ON(IWL_FIRST_CCK_RATE != 0);
 546
 547                         cck |= BIT(hw);
 548                         if (lowest_present_cck > hw)
 549                                 lowest_present_cck = hw;
 550                 }
 551         }
 552
 553         /*
 554          * Now we've got the basic rates as bitmaps in the ofdm and cck
 555          * variables. This isn't sufficient though, as there might not
 556          * be all the right rates in the bitmap. E.g. if the only basic
 557          * rates are 5.5 Mbps and 11 Mbps, we still need to add 1 Mbps
 558          * and 6 Mbps because the 802.11-2007 standard says in 9.6:
 559          *
 560          *    [...] a STA responding to a received frame shall transmit
 561          *    its Control Response frame [...] at the highest rate in the
 562          *    BSSBasicRateSet parameter that is less than or equal to the
 563          *    rate of the immediately previous frame in the frame exchange
 564          *    sequence ([...]) and that is of the same modulation class
 565          *    ([...]) as the received frame. If no rate contained in the
 566          *    BSSBasicRateSet parameter meets these conditions, then the
 567          *    control frame sent in response to a received frame shall be
 568          *    transmitted at the highest mandatory rate of the PHY that is
 569          *    less than or equal to the rate of the received frame, and
 570          *    that is of the same modulation class as the received frame.
 571          *
 572          * As a consequence, we need to add all mandatory rates that are
 573          * lower than all of the basic rates to these bitmaps.
 574          */
 575
 576         if (IWL_RATE_24M_INDEX < lowest_present_ofdm)
 577                 ofdm |= IWL_RATE_BIT_MSK(24) >> IWL_FIRST_OFDM_RATE;
 578         if (IWL_RATE_12M_INDEX < lowest_present_ofdm)
 579                 ofdm |= IWL_RATE_BIT_MSK(12) >> IWL_FIRST_OFDM_RATE;
 580         /* 6M already there or needed so always add */
 581         ofdm |= IWL_RATE_BIT_MSK(6) >> IWL_FIRST_OFDM_RATE;
 582
 583         /*
 584          * CCK is a bit more complex with DSSS vs. HR/DSSS vs. ERP.
 585          * Note, however:
 586          *  - if no CCK rates are basic, it must be ERP since there must
 587          *    be some basic rates at all, so they're OFDM => ERP PHY
 588          *    (or we're in 5 GHz, and the cck bitmap will never be used)
 589          *  - if 11M is a basic rate, it must be ERP as well, so add 5.5M
 590          *  - if 5.5M is basic, 1M and 2M are mandatory
 591          *  - if 2M is basic, 1M is mandatory
 592          *  - if 1M is basic, that's the only valid ACK rate.
 593          * As a consequence, it's not as complicated as it sounds, just add
 594          * any lower rates to the ACK rate bitmap.
 595          */
 596         if (IWL_RATE_11M_INDEX < lowest_present_cck)
 597                 cck |= IWL_RATE_BIT_MSK(11) >> IWL_FIRST_CCK_RATE;
 598         if (IWL_RATE_5M_INDEX < lowest_present_cck)
 599                 cck |= IWL_RATE_BIT_MSK(5) >> IWL_FIRST_CCK_RATE;
 600         if (IWL_RATE_2M_INDEX < lowest_present_cck)
 601                 cck |= IWL_RATE_BIT_MSK(2) >> IWL_FIRST_CCK_RATE;
 602         /* 1M already there or needed so always add */
 603         cck |= IWL_RATE_BIT_MSK(1) >> IWL_FIRST_CCK_RATE;
 604
 605         *cck_rates = cck;
 606         *ofdm_rates = ofdm;
 607 }
 608
 609 static void iwl_mvm_mac_ctxt_set_ht_flags(struct iwl_mvm *mvm,
 610                                          struct ieee80211_vif *vif,
 611                                          struct iwl_mac_ctx_cmd *cmd)
 612 {
 613         /* for both sta and ap, ht_operation_mode hold the protection_mode */
 614         u8 protection_mode = vif->bss_conf.ht_operation_mode &
 615                                  IEEE80211_HT_OP_MODE_PROTECTION;
 616         /* The fw does not distinguish between ht and fat */
 617         u32 ht_flag = MAC_PROT_FLG_HT_PROT | MAC_PROT_FLG_FAT_PROT;
 618
 619         IWL_DEBUG_RATE(mvm, "protection mode set to %d\n", protection_mode);
 620         /*
 621          * See section 9.23.3.1 of IEEE 80211-2012.
 622          * Nongreenfield HT STAs Present is not supported.
 623          */
 624         switch (protection_mode) {
 625         case IEEE80211_HT_OP_MODE_PROTECTION_NONE:
 626                 break;
 627         case IEEE80211_HT_OP_MODE_PROTECTION_NONMEMBER:
 628         case IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED:
 629                 cmd->protection_flags |= cpu_to_le32(ht_flag);
 630                 break;
 631         case IEEE80211_HT_OP_MODE_PROTECTION_20MHZ:
 632                 /* Protect when channel wider than 20MHz */
 633                 if (vif->bss_conf.chandef.width > NL80211_CHAN_WIDTH_20)
 634                         cmd->protection_flags |= cpu_to_le32(ht_flag);
 635                 break;
 636         default:
 637                 IWL_ERR(mvm, "Illegal protection mode %d\n",
 638                         protection_mode);
 639                 break;
 640         }
 641 }
 642
 643 static void iwl_mvm_mac_ctxt_cmd_common(struct iwl_mvm *mvm,
 644                                         struct ieee80211_vif *vif,
 645                                         struct iwl_mac_ctx_cmd *cmd,
 646                                         const u8 *bssid_override,
 647                                         u32 action)
 648 {
 649         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 650         struct ieee80211_chanctx_conf *chanctx;
 651         bool ht_enabled = !!(vif->bss_conf.ht_operation_mode &
 652                              IEEE80211_HT_OP_MODE_PROTECTION);
 653         u8 cck_ack_rates, ofdm_ack_rates;
 654         const u8 *bssid = bssid_override ?: vif->bss_conf.bssid;
 655         int i;
 656
 657         cmd->id_and_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id,
 658                                                             mvmvif->color));
 659         cmd->action = cpu_to_le32(action);
 660
 661         switch (vif->type) {
 662         case NL80211_IFTYPE_STATION:
 663                 if (vif->p2p)
 664                         cmd->mac_type = cpu_to_le32(FW_MAC_TYPE_P2P_STA);
 665                 else
 666                         cmd->mac_type = cpu_to_le32(FW_MAC_TYPE_BSS_STA);
 667                 break;
 668         case NL80211_IFTYPE_AP:
 669                 cmd->mac_type = cpu_to_le32(FW_MAC_TYPE_GO);
 670                 break;
 671         case NL80211_IFTYPE_MONITOR:
 672                 cmd->mac_type = cpu_to_le32(FW_MAC_TYPE_LISTENER);
 673                 break;
 674         case NL80211_IFTYPE_P2P_DEVICE:
 675                 cmd->mac_type = cpu_to_le32(FW_MAC_TYPE_P2P_DEVICE);
 676                 break;
 677         case NL80211_IFTYPE_ADHOC:
 678                 cmd->mac_type = cpu_to_le32(FW_MAC_TYPE_IBSS);
 679                 break;
 680         default:
 681                 WARN_ON_ONCE(1);
 682         }
 683
 684         cmd->tsf_id = cpu_to_le32(mvmvif->tsf_id);
 685
 686         memcpy(cmd->node_addr, vif->addr, ETH_ALEN);
 687
 688         if (bssid)
 689                 memcpy(cmd->bssid_addr, bssid, ETH_ALEN);
 690         else
 691                 eth_broadcast_addr(cmd->bssid_addr);
 692
 693         rcu_read_lock();
 694         chanctx = rcu_dereference(vif->chanctx_conf);
 695         iwl_mvm_ack_rates(mvm, vif, chanctx ? chanctx->def.chan->band
 696                                             : IEEE80211_BAND_2GHZ,
 697                           &cck_ack_rates, &ofdm_ack_rates);
 698         rcu_read_unlock();
 699
 700         cmd->cck_rates = cpu_to_le32((u32)cck_ack_rates);
 701         cmd->ofdm_rates = cpu_to_le32((u32)ofdm_ack_rates);
 702
 703         cmd->cck_short_preamble =
 704                 cpu_to_le32(vif->bss_conf.use_short_preamble ?
 705                             MAC_FLG_SHORT_PREAMBLE : 0);
 706         cmd->short_slot =
 707                 cpu_to_le32(vif->bss_conf.use_short_slot ?
 708                             MAC_FLG_SHORT_SLOT : 0);
 709
 710         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 711                 u8 txf = iwl_mvm_ac_to_tx_fifo[i];
 712
 713                 cmd->ac[txf].cw_min =
 714                         cpu_to_le16(mvmvif->queue_params[i].cw_min);
 715                 cmd->ac[txf].cw_max =
 716                         cpu_to_le16(mvmvif->queue_params[i].cw_max);
 717                 cmd->ac[txf].edca_txop =
 718                         cpu_to_le16(mvmvif->queue_params[i].txop * 32);
 719                 cmd->ac[txf].aifsn = mvmvif->queue_params[i].aifs;
 720                 cmd->ac[txf].fifos_mask = BIT(txf);
 721         }
 722
 723         /* in AP mode, the MCAST FIFO takes the EDCA params from VO */
 724         if (vif->type == NL80211_IFTYPE_AP)
 725                 cmd->ac[IWL_MVM_TX_FIFO_VO].fifos_mask |=
 726                         BIT(IWL_MVM_TX_FIFO_MCAST);
 727
 728         if (vif->bss_conf.qos)
 729                 cmd->qos_flags |= cpu_to_le32(MAC_QOS_FLG_UPDATE_EDCA);
 730
 731         if (vif->bss_conf.use_cts_prot)
 732                 cmd->protection_flags |= cpu_to_le32(MAC_PROT_FLG_TGG_PROTECT);
 733
 734         IWL_DEBUG_RATE(mvm, "use_cts_prot %d, ht_operation_mode %d\n",
 735                        vif->bss_conf.use_cts_prot,
 736                        vif->bss_conf.ht_operation_mode);
 737         if (vif->bss_conf.chandef.width != NL80211_CHAN_WIDTH_20_NOHT)
 738                 cmd->qos_flags |= cpu_to_le32(MAC_QOS_FLG_TGN);
 739         if (ht_enabled)
 740                 iwl_mvm_mac_ctxt_set_ht_flags(mvm, vif, cmd);
 741
 742         cmd->filter_flags = cpu_to_le32(MAC_FILTER_ACCEPT_GRP);
 743 }
 744
 745 static int iwl_mvm_mac_ctxt_send_cmd(struct iwl_mvm *mvm,
 746                                      struct iwl_mac_ctx_cmd *cmd)
 747 {
 748         int ret = iwl_mvm_send_cmd_pdu(mvm, MAC_CONTEXT_CMD, 0,
 749                                        sizeof(*cmd), cmd);
 750         if (ret)
 751                 IWL_ERR(mvm, "Failed to send MAC context (action:%d): %d\n",
 752                         le32_to_cpu(cmd->action), ret);
 753         return ret;
 754 }
 755
 756 static int iwl_mvm_mac_ctxt_cmd_sta(struct iwl_mvm *mvm,
 757                                     struct ieee80211_vif *vif,
 758                                     u32 action, bool force_assoc_off,
 759                                     const u8 *bssid_override)
 760 {
 761         struct iwl_mac_ctx_cmd cmd = {};
 762         struct iwl_mac_data_sta *ctxt_sta;
 763
 764         WARN_ON(vif->type != NL80211_IFTYPE_STATION);
 765
 766         /* Fill the common data for all mac context types */
 767         iwl_mvm_mac_ctxt_cmd_common(mvm, vif, &cmd, bssid_override, action);
 768
 769         if (vif->p2p) {
 770                 struct ieee80211_p2p_noa_attr *noa =
 771                         &vif->bss_conf.p2p_noa_attr;
 772
 773                 cmd.p2p_sta.ctwin = cpu_to_le32(noa->oppps_ctwindow &
 774                                         IEEE80211_P2P_OPPPS_CTWINDOW_MASK);
 775                 ctxt_sta = &cmd.p2p_sta.sta;
 776         } else {
 777                 ctxt_sta = &cmd.sta;
 778         }
 779
 780         /* We need the dtim_period to set the MAC as associated */
 781         if (vif->bss_conf.assoc && vif->bss_conf.dtim_period &&
 782             !force_assoc_off) {
 783                 u32 dtim_offs;
 784
 785                 /*
 786                  * The DTIM count counts down, so when it is N that means N
 787                  * more beacon intervals happen until the DTIM TBTT. Therefore
 788                  * add this to the current time. If that ends up being in the
 789                  * future, the firmware will handle it.
 790                  *
 791                  * Also note that the system_timestamp (which we get here as
 792                  * "sync_device_ts") and TSF timestamp aren't at exactly the
 793                  * same offset in the frame -- the TSF is at the first symbol
 794                  * of the TSF, the system timestamp is at signal acquisition
 795                  * time. This means there's an offset between them of at most
 796                  * a few hundred microseconds (24 * 8 bits + PLCP time gives
 797                  * 384us in the longest case), this is currently not relevant
 798                  * as the firmware wakes up around 2ms before the TBTT.
 799                  */
 800                 dtim_offs = vif->bss_conf.sync_dtim_count *
 801                                 vif->bss_conf.beacon_int;
 802                 /* convert TU to usecs */
 803                 dtim_offs *= 1024;
 804
 805                 ctxt_sta->dtim_tsf =
 806                         cpu_to_le64(vif->bss_conf.sync_tsf + dtim_offs);
 807                 ctxt_sta->dtim_time =
 808                         cpu_to_le32(vif->bss_conf.sync_device_ts + dtim_offs);
 809
 810                 IWL_DEBUG_INFO(mvm, "DTIM TBTT is 0x%llx/0x%x, offset %d\n",
 811                                le64_to_cpu(ctxt_sta->dtim_tsf),
 812                                le32_to_cpu(ctxt_sta->dtim_time),
 813                                dtim_offs);
 814
 815                 ctxt_sta->is_assoc = cpu_to_le32(1);
 816         } else {
 817                 ctxt_sta->is_assoc = cpu_to_le32(0);
 818
 819                 /* Allow beacons to pass through as long as we are not
 820                  * associated, or we do not have dtim period information.
 821                  */
 822                 cmd.filter_flags |= cpu_to_le32(MAC_FILTER_IN_BEACON);
 823         }
 824
 825         ctxt_sta->bi = cpu_to_le32(vif->bss_conf.beacon_int);
 826         ctxt_sta->bi_reciprocal =
 827                 cpu_to_le32(iwl_mvm_reciprocal(vif->bss_conf.beacon_int));
 828         ctxt_sta->dtim_interval = cpu_to_le32(vif->bss_conf.beacon_int *
 829                                               vif->bss_conf.dtim_period);
 830         ctxt_sta->dtim_reciprocal =
 831                 cpu_to_le32(iwl_mvm_reciprocal(vif->bss_conf.beacon_int *
 832                                                vif->bss_conf.dtim_period));
 833
 834         ctxt_sta->listen_interval = cpu_to_le32(mvm->hw->conf.listen_interval);
 835         ctxt_sta->assoc_id = cpu_to_le32(vif->bss_conf.aid);
 836
 837         return iwl_mvm_mac_ctxt_send_cmd(mvm, &cmd);
 838 }
 839
 840 static int iwl_mvm_mac_ctxt_cmd_listener(struct iwl_mvm *mvm,
 841                                          struct ieee80211_vif *vif,
 842                                          u32 action)
 843 {
 844         struct iwl_mac_ctx_cmd cmd = {};
 845
 846         WARN_ON(vif->type != NL80211_IFTYPE_MONITOR);
 847
 848         iwl_mvm_mac_ctxt_cmd_common(mvm, vif, &cmd, NULL, action);
 849
 850         cmd.filter_flags = cpu_to_le32(MAC_FILTER_IN_PROMISC |
 851                                        MAC_FILTER_IN_CONTROL_AND_MGMT |
 852                                        MAC_FILTER_IN_BEACON |
 853                                        MAC_FILTER_IN_PROBE_REQUEST |
 854                                        MAC_FILTER_IN_CRC32);
 855         mvm->hw->flags |= IEEE80211_HW_RX_INCLUDES_FCS;
 856
 857         return iwl_mvm_mac_ctxt_send_cmd(mvm, &cmd);
 858 }
 859
 860 static int iwl_mvm_mac_ctxt_cmd_ibss(struct iwl_mvm *mvm,
 861                                      struct ieee80211_vif *vif,
 862                                      u32 action)
 863 {
 864         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 865         struct iwl_mac_ctx_cmd cmd = {};
 866
 867         WARN_ON(vif->type != NL80211_IFTYPE_ADHOC);
 868
 869         iwl_mvm_mac_ctxt_cmd_common(mvm, vif, &cmd, NULL, action);
 870
 871         cmd.filter_flags = cpu_to_le32(MAC_FILTER_IN_BEACON |
 872                                        MAC_FILTER_IN_PROBE_REQUEST);
 873
 874         /* cmd.ibss.beacon_time/cmd.ibss.beacon_tsf are curently ignored */
 875         cmd.ibss.bi = cpu_to_le32(vif->bss_conf.beacon_int);
 876         cmd.ibss.bi_reciprocal =
 877                 cpu_to_le32(iwl_mvm_reciprocal(vif->bss_conf.beacon_int));
 878
 879         /* TODO: Assumes that the beacon id == mac context id */
 880         cmd.ibss.beacon_template = cpu_to_le32(mvmvif->id);
 881
 882         return iwl_mvm_mac_ctxt_send_cmd(mvm, &cmd);
 883 }
 884
 885 struct iwl_mvm_go_iterator_data {
 886         bool go_active;
 887 };
 888
 889 static void iwl_mvm_go_iterator(void *_data, u8 *mac, struct ieee80211_vif *vif)
 890 {
 891         struct iwl_mvm_go_iterator_data *data = _data;
 892         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 893
 894         if (vif->type == NL80211_IFTYPE_AP && vif->p2p &&
 895             mvmvif->ap_ibss_active)
 896                 data->go_active = true;
 897 }
 898
 899 static int iwl_mvm_mac_ctxt_cmd_p2p_device(struct iwl_mvm *mvm,
 900                                            struct ieee80211_vif *vif,
 901                                            u32 action)
 902 {
 903         struct iwl_mac_ctx_cmd cmd = {};
 904         struct iwl_mvm_go_iterator_data data = {};
 905
 906         WARN_ON(vif->type != NL80211_IFTYPE_P2P_DEVICE);
 907
 908         iwl_mvm_mac_ctxt_cmd_common(mvm, vif, &cmd, NULL, action);
 909
 910         cmd.protection_flags |= cpu_to_le32(MAC_PROT_FLG_TGG_PROTECT);
 911
 912         /* Override the filter flags to accept only probe requests */
 913         cmd.filter_flags = cpu_to_le32(MAC_FILTER_IN_PROBE_REQUEST);
 914
 915         /*
 916          * This flag should be set to true when the P2P Device is
 917          * discoverable and there is at least another active P2P GO. Settings
 918          * this flag will allow the P2P Device to be discoverable on other
 919          * channels in addition to its listen channel.
 920          * Note that this flag should not be set in other cases as it opens the
 921          * Rx filters on all MAC and increases the number of interrupts.
 922          */
 923         ieee80211_iterate_active_interfaces_atomic(
 924                 mvm->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
 925                 iwl_mvm_go_iterator, &data);
 926
 927         cmd.p2p_dev.is_disc_extended = cpu_to_le32(data.go_active ? 1 : 0);
 928         return iwl_mvm_mac_ctxt_send_cmd(mvm, &cmd);
 929 }
 930
 931 static void iwl_mvm_mac_ctxt_set_tim(struct iwl_mvm *mvm,
 932                                      struct iwl_mac_beacon_cmd *beacon_cmd,
 933                                      u8 *beacon, u32 frame_size)
 934 {
 935         u32 tim_idx;
 936         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)beacon;
 937
 938         /* The index is relative to frame start but we start looking at the
 939          * variable-length part of the beacon. */
 940         tim_idx = mgmt->u.beacon.variable - beacon;
 941
 942         /* Parse variable-length elements of beacon to find WLAN_EID_TIM */
 943         while ((tim_idx < (frame_size - 2)) &&
 944                         (beacon[tim_idx] != WLAN_EID_TIM))
 945                 tim_idx += beacon[tim_idx+1] + 2;
 946
 947         /* If TIM field was found, set variables */
 948         if ((tim_idx < (frame_size - 1)) && (beacon[tim_idx] == WLAN_EID_TIM)) {
 949                 beacon_cmd->tim_idx = cpu_to_le32(tim_idx);
 950                 beacon_cmd->tim_size = cpu_to_le32((u32)beacon[tim_idx+1]);
 951         } else {
 952                 IWL_WARN(mvm, "Unable to find TIM Element in beacon\n");
 953         }
 954 }
 955
 956 static int iwl_mvm_mac_ctxt_send_beacon(struct iwl_mvm *mvm,
 957                                         struct ieee80211_vif *vif,
 958                                         struct sk_buff *beacon)
 959 {
 960         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 961         struct iwl_host_cmd cmd = {
 962                 .id = BEACON_TEMPLATE_CMD,
 963                 .flags = CMD_ASYNC,
 964         };
 965         struct iwl_mac_beacon_cmd beacon_cmd = {};
 966         struct ieee80211_tx_info *info;
 967         u32 beacon_skb_len;
 968         u32 rate, tx_flags;
 969
 970         if (WARN_ON(!beacon))
 971                 return -EINVAL;
 972
 973         beacon_skb_len = beacon->len;
 974
 975         /* TODO: for now the beacon template id is set to be the mac context id.
 976          * Might be better to handle it as another resource ... */
 977         beacon_cmd.template_id = cpu_to_le32((u32)mvmvif->id);
 978         info = IEEE80211_SKB_CB(beacon);
 979
 980         /* Set up TX command fields */
 981         beacon_cmd.tx.len = cpu_to_le16((u16)beacon_skb_len);
 982         beacon_cmd.tx.sta_id = mvmvif->bcast_sta.sta_id;
 983         beacon_cmd.tx.life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
 984         tx_flags = TX_CMD_FLG_SEQ_CTL | TX_CMD_FLG_TSF;
 985         tx_flags |=
 986                 iwl_mvm_bt_coex_tx_prio(mvm, (void *)beacon->data, info, 0) <<
 987                                                 TX_CMD_FLG_BT_PRIO_POS;
 988         beacon_cmd.tx.tx_flags = cpu_to_le32(tx_flags);
 989
 990         mvm->mgmt_last_antenna_idx =
 991                 iwl_mvm_next_antenna(mvm, iwl_mvm_get_valid_tx_ant(mvm),
 992                                      mvm->mgmt_last_antenna_idx);
 993
 994         beacon_cmd.tx.rate_n_flags =
 995                 cpu_to_le32(BIT(mvm->mgmt_last_antenna_idx) <<
 996                             RATE_MCS_ANT_POS);
 997
 998         if (info->band == IEEE80211_BAND_5GHZ || vif->p2p) {
 999                 rate = IWL_FIRST_OFDM_RATE;
1000         } else {
1001                 rate = IWL_FIRST_CCK_RATE;
1002                 beacon_cmd.tx.rate_n_flags |= cpu_to_le32(RATE_MCS_CCK_MSK);
1003         }
1004         beacon_cmd.tx.rate_n_flags |=
1005                 cpu_to_le32(iwl_mvm_mac80211_idx_to_hwrate(rate));
1006
1007         /* Set up TX beacon command fields */
1008         if (vif->type == NL80211_IFTYPE_AP)
1009                 iwl_mvm_mac_ctxt_set_tim(mvm, &beacon_cmd,
1010                                          beacon->data,
1011                                          beacon_skb_len);
1012
1013         /* Submit command */
1014         cmd.len[0] = sizeof(beacon_cmd);
1015         cmd.data[0] = &beacon_cmd;
1016         cmd.dataflags[0] = 0;
1017         cmd.len[1] = beacon_skb_len;
1018         cmd.data[1] = beacon->data;
1019         cmd.dataflags[1] = IWL_HCMD_DFL_DUP;
1020
1021         return iwl_mvm_send_cmd(mvm, &cmd);
1022 }
1023
1024 /* The beacon template for the AP/GO/IBSS has changed and needs update */
1025 int iwl_mvm_mac_ctxt_beacon_changed(struct iwl_mvm *mvm,
1026                                     struct ieee80211_vif *vif)
1027 {
1028         struct sk_buff *beacon;
1029         int ret;
1030
1031         WARN_ON(vif->type != NL80211_IFTYPE_AP &&
1032                 vif->type != NL80211_IFTYPE_ADHOC);
1033
1034         beacon = ieee80211_beacon_get_template(mvm->hw, vif, NULL);
1035         if (!beacon)
1036                 return -ENOMEM;
1037
1038         ret = iwl_mvm_mac_ctxt_send_beacon(mvm, vif, beacon);
1039         dev_kfree_skb(beacon);
1040         return ret;
1041 }
1042
1043 struct iwl_mvm_mac_ap_iterator_data {
1044         struct iwl_mvm *mvm;
1045         struct ieee80211_vif *vif;
1046         u32 beacon_device_ts;
1047         u16 beacon_int;
1048 };
1049
1050 /* Find the beacon_device_ts and beacon_int for a managed interface */
1051 static void iwl_mvm_mac_ap_iterator(void *_data, u8 *mac,
1052                                     struct ieee80211_vif *vif)
1053 {
1054         struct iwl_mvm_mac_ap_iterator_data *data = _data;
1055
1056         if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc)
1057                 return;
1058
1059         /* Station client has higher priority over P2P client*/
1060         if (vif->p2p && data->beacon_device_ts)
1061                 return;
1062
1063         data->beacon_device_ts = vif->bss_conf.sync_device_ts;
1064         data->beacon_int = vif->bss_conf.beacon_int;
1065 }
1066
1067 /*
1068  * Fill the specific data for mac context of type AP of P2P GO
1069  */
1070 static void iwl_mvm_mac_ctxt_cmd_fill_ap(struct iwl_mvm *mvm,
1071                                          struct ieee80211_vif *vif,
1072                                          struct iwl_mac_data_ap *ctxt_ap,
1073                                          bool add)
1074 {
1075         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
1076         struct iwl_mvm_mac_ap_iterator_data data = {
1077                 .mvm = mvm,
1078                 .vif = vif,
1079                 .beacon_device_ts = 0
1080         };
1081
1082         ctxt_ap->bi = cpu_to_le32(vif->bss_conf.beacon_int);
1083         ctxt_ap->bi_reciprocal =
1084                 cpu_to_le32(iwl_mvm_reciprocal(vif->bss_conf.beacon_int));
1085         ctxt_ap->dtim_interval = cpu_to_le32(vif->bss_conf.beacon_int *
1086                                              vif->bss_conf.dtim_period);
1087         ctxt_ap->dtim_reciprocal =
1088                 cpu_to_le32(iwl_mvm_reciprocal(vif->bss_conf.beacon_int *
1089                                                vif->bss_conf.dtim_period));
1090
1091         ctxt_ap->mcast_qid = cpu_to_le32(vif->cab_queue);
1092
1093         /*
1094          * Only set the beacon time when the MAC is being added, when we
1095          * just modify the MAC then we should keep the time -- the firmware
1096          * can otherwise have a "jumping" TBTT.
1097          */
1098         if (add) {
1099                 /*
1100                  * If there is a station/P2P client interface which is
1101                  * associated, set the AP's TBTT far enough from the station's
1102                  * TBTT. Otherwise, set it to the current system time
1103                  */
1104                 ieee80211_iterate_active_interfaces_atomic(
1105                         mvm->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
1106                         iwl_mvm_mac_ap_iterator, &data);
1107
1108                 if (data.beacon_device_ts) {
1109                         u32 rand = (prandom_u32() % (64 - 36)) + 36;
1110                         mvmvif->ap_beacon_time = data.beacon_device_ts +
1111                                 ieee80211_tu_to_usec(data.beacon_int * rand /
1112                                                      100);
1113                 } else {
1114                         mvmvif->ap_beacon_time =
1115                                 iwl_read_prph(mvm->trans,
1116                                               DEVICE_SYSTEM_TIME_REG);
1117                 }
1118         }
1119
1120         ctxt_ap->beacon_time = cpu_to_le32(mvmvif->ap_beacon_time);
1121         ctxt_ap->beacon_tsf = 0; /* unused */
1122
1123         /* TODO: Assume that the beacon id == mac context id */
1124         ctxt_ap->beacon_template = cpu_to_le32(mvmvif->id);
1125 }
1126
1127 static int iwl_mvm_mac_ctxt_cmd_ap(struct iwl_mvm *mvm,
1128                                    struct ieee80211_vif *vif,
1129                                    u32 action)
1130 {
1131         struct iwl_mac_ctx_cmd cmd = {};
1132
1133         WARN_ON(vif->type != NL80211_IFTYPE_AP || vif->p2p);
1134
1135         /* Fill the common data for all mac context types */
1136         iwl_mvm_mac_ctxt_cmd_common(mvm, vif, &cmd, NULL, action);
1137
1138         /*
1139          * pass probe requests and beacons from other APs (needed
1140          * for ht protection)
1141          */
1142         cmd.filter_flags |= cpu_to_le32(MAC_FILTER_IN_PROBE_REQUEST |
1143                                         MAC_FILTER_IN_BEACON);
1144
1145         /* Fill the data specific for ap mode */
1146         iwl_mvm_mac_ctxt_cmd_fill_ap(mvm, vif, &cmd.ap,
1147                                      action == FW_CTXT_ACTION_ADD);
1148
1149         return iwl_mvm_mac_ctxt_send_cmd(mvm, &cmd);
1150 }
1151
1152 static int iwl_mvm_mac_ctxt_cmd_go(struct iwl_mvm *mvm,
1153                                    struct ieee80211_vif *vif,
1154                                    u32 action)
1155 {
1156         struct iwl_mac_ctx_cmd cmd = {};
1157         struct ieee80211_p2p_noa_attr *noa = &vif->bss_conf.p2p_noa_attr;
1158
1159         WARN_ON(vif->type != NL80211_IFTYPE_AP || !vif->p2p);
1160
1161         /* Fill the common data for all mac context types */
1162         iwl_mvm_mac_ctxt_cmd_common(mvm, vif, &cmd, NULL, action);
1163
1164         /*
1165          * pass probe requests and beacons from other APs (needed
1166          * for ht protection)
1167          */
1168         cmd.filter_flags |= cpu_to_le32(MAC_FILTER_IN_PROBE_REQUEST |
1169                                         MAC_FILTER_IN_BEACON);
1170
1171         /* Fill the data specific for GO mode */
1172         iwl_mvm_mac_ctxt_cmd_fill_ap(mvm, vif, &cmd.go.ap,
1173                                      action == FW_CTXT_ACTION_ADD);
1174
1175         cmd.go.ctwin = cpu_to_le32(noa->oppps_ctwindow &
1176                                         IEEE80211_P2P_OPPPS_CTWINDOW_MASK);
1177         cmd.go.opp_ps_enabled =
1178                         cpu_to_le32(!!(noa->oppps_ctwindow &
1179                                         IEEE80211_P2P_OPPPS_ENABLE_BIT));
1180
1181         return iwl_mvm_mac_ctxt_send_cmd(mvm, &cmd);
1182 }
1183
1184 static int iwl_mvm_mac_ctx_send(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1185                                 u32 action, bool force_assoc_off,
1186                                 const u8 *bssid_override)
1187 {
1188         switch (vif->type) {
1189         case NL80211_IFTYPE_STATION:
1190                 return iwl_mvm_mac_ctxt_cmd_sta(mvm, vif, action,
1191                                                 force_assoc_off,
1192                                                 bssid_override);
1193                 break;
1194         case NL80211_IFTYPE_AP:
1195                 if (!vif->p2p)
1196                         return iwl_mvm_mac_ctxt_cmd_ap(mvm, vif, action);
1197                 else
1198                         return iwl_mvm_mac_ctxt_cmd_go(mvm, vif, action);
1199                 break;
1200         case NL80211_IFTYPE_MONITOR:
1201                 return iwl_mvm_mac_ctxt_cmd_listener(mvm, vif, action);
1202         case NL80211_IFTYPE_P2P_DEVICE:
1203                 return iwl_mvm_mac_ctxt_cmd_p2p_device(mvm, vif, action);
1204         case NL80211_IFTYPE_ADHOC:
1205                 return iwl_mvm_mac_ctxt_cmd_ibss(mvm, vif, action);
1206         default:
1207                 break;
1208         }
1209
1210         return -EOPNOTSUPP;
1211 }
1212
1213 int iwl_mvm_mac_ctxt_add(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
1214 {
1215         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
1216         int ret;
1217
1218         if (WARN_ONCE(mvmvif->uploaded, "Adding active MAC %pM/%d\n",
1219                       vif->addr, ieee80211_vif_type_p2p(vif)))
1220                 return -EIO;
1221
1222         ret = iwl_mvm_mac_ctx_send(mvm, vif, FW_CTXT_ACTION_ADD,
1223                                    true, NULL);
1224         if (ret)
1225                 return ret;
1226
1227         /* will only do anything at resume from D3 time */
1228         iwl_mvm_set_last_nonqos_seq(mvm, vif);
1229
1230         mvmvif->uploaded = true;
1231         return 0;
1232 }
1233
1234 int iwl_mvm_mac_ctxt_changed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1235                              bool force_assoc_off, const u8 *bssid_override)
1236 {
1237         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
1238
1239         if (WARN_ONCE(!mvmvif->uploaded, "Changing inactive MAC %pM/%d\n",
1240                       vif->addr, ieee80211_vif_type_p2p(vif)))
1241                 return -EIO;
1242
1243         return iwl_mvm_mac_ctx_send(mvm, vif, FW_CTXT_ACTION_MODIFY,
1244                                     force_assoc_off, bssid_override);
1245 }
1246
1247 int iwl_mvm_mac_ctxt_remove(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
1248 {
1249         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
1250         struct iwl_mac_ctx_cmd cmd;
1251         int ret;
1252
1253         if (WARN_ONCE(!mvmvif->uploaded, "Removing inactive MAC %pM/%d\n",
1254                       vif->addr, ieee80211_vif_type_p2p(vif)))
1255                 return -EIO;
1256
1257         memset(&cmd, 0, sizeof(cmd));
1258
1259         cmd.id_and_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id,
1260                                                            mvmvif->color));
1261         cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE);
1262
1263         ret = iwl_mvm_send_cmd_pdu(mvm, MAC_CONTEXT_CMD, 0,
1264                                    sizeof(cmd), &cmd);
1265         if (ret) {
1266                 IWL_ERR(mvm, "Failed to remove MAC context: %d\n", ret);
1267                 return ret;
1268         }
1269
1270         mvmvif->uploaded = false;
1271
1272         if (vif->type == NL80211_IFTYPE_MONITOR)
1273                 mvm->hw->flags &= ~IEEE80211_HW_RX_INCLUDES_FCS;
1274
1275         return 0;
1276 }
1277
1278 static void iwl_mvm_csa_count_down(struct iwl_mvm *mvm,
1279                                    struct ieee80211_vif *csa_vif, u32 gp2,
1280                                    bool tx_success)
1281 {
1282         struct iwl_mvm_vif *mvmvif =
1283                         iwl_mvm_vif_from_mac80211(csa_vif);
1284
1285         /* Don't start to countdown from a failed beacon */
1286         if (!tx_success && !mvmvif->csa_countdown)
1287                 return;
1288
1289         mvmvif->csa_countdown = true;
1290
1291         if (!ieee80211_csa_is_complete(csa_vif)) {
1292                 int c = ieee80211_csa_update_counter(csa_vif);
1293
1294                 iwl_mvm_mac_ctxt_beacon_changed(mvm, csa_vif);
1295                 if (csa_vif->p2p &&
1296                     !iwl_mvm_te_scheduled(&mvmvif->time_event_data) && gp2 &&
1297                     tx_success) {
1298                         u32 rel_time = (c + 1) *
1299                                        csa_vif->bss_conf.beacon_int -
1300                                        IWL_MVM_CHANNEL_SWITCH_TIME_GO;
1301                         u32 apply_time = gp2 + rel_time * 1024;
1302
1303                         iwl_mvm_schedule_csa_period(mvm, csa_vif,
1304                                          IWL_MVM_CHANNEL_SWITCH_TIME_GO -
1305                                          IWL_MVM_CHANNEL_SWITCH_MARGIN,
1306                                          apply_time);
1307                 }
1308         } else if (!iwl_mvm_te_scheduled(&mvmvif->time_event_data)) {
1309                 /* we don't have CSA NoA scheduled yet, switch now */
1310                 ieee80211_csa_finish(csa_vif);
1311                 RCU_INIT_POINTER(mvm->csa_vif, NULL);
1312         }
1313 }
1314
1315 int iwl_mvm_rx_beacon_notif(struct iwl_mvm *mvm,
1316                             struct iwl_rx_cmd_buffer *rxb,
1317                             struct iwl_device_cmd *cmd)
1318 {
1319         struct iwl_rx_packet *pkt = rxb_addr(rxb);
1320         struct iwl_extended_beacon_notif *beacon = (void *)pkt->data;
1321         struct iwl_mvm_tx_resp *beacon_notify_hdr;
1322         struct ieee80211_vif *csa_vif;
1323         struct ieee80211_vif *tx_blocked_vif;
1324         u16 status;
1325
1326         lockdep_assert_held(&mvm->mutex);
1327
1328         beacon_notify_hdr = &beacon->beacon_notify_hdr;
1329         mvm->ap_last_beacon_gp2 = le32_to_cpu(beacon->gp2);
1330
1331         status = le16_to_cpu(beacon_notify_hdr->status.status) & TX_STATUS_MSK;
1332         IWL_DEBUG_RX(mvm,
1333                      "beacon status %#x retries:%d tsf:0x%16llX gp2:0x%X rate:%d\n",
1334                      status, beacon_notify_hdr->failure_frame,
1335                      le64_to_cpu(beacon->tsf),
1336                      mvm->ap_last_beacon_gp2,
1337                      le32_to_cpu(beacon_notify_hdr->initial_rate));
1338
1339         csa_vif = rcu_dereference_protected(mvm->csa_vif,
1340                                             lockdep_is_held(&mvm->mutex));
1341         if (unlikely(csa_vif && csa_vif->csa_active))
1342                 iwl_mvm_csa_count_down(mvm, csa_vif, mvm->ap_last_beacon_gp2,
1343                                        (status == TX_STATUS_SUCCESS));
1344
1345         tx_blocked_vif = rcu_dereference_protected(mvm->csa_tx_blocked_vif,
1346                                                 lockdep_is_held(&mvm->mutex));
1347         if (unlikely(tx_blocked_vif)) {
1348                 struct iwl_mvm_vif *mvmvif =
1349                         iwl_mvm_vif_from_mac80211(tx_blocked_vif);
1350
1351                 /*
1352                  * The channel switch is started and we have blocked the
1353                  * stations. If this is the first beacon (the timeout wasn't
1354                  * set), set the unblock timeout, otherwise countdown
1355                  */
1356                 if (!mvm->csa_tx_block_bcn_timeout)
1357                         mvm->csa_tx_block_bcn_timeout =
1358                                 IWL_MVM_CS_UNBLOCK_TX_TIMEOUT;
1359                 else
1360                         mvm->csa_tx_block_bcn_timeout--;
1361
1362                 /* Check if the timeout is expired, and unblock tx */
1363                 if (mvm->csa_tx_block_bcn_timeout == 0) {
1364                         iwl_mvm_modify_all_sta_disable_tx(mvm, mvmvif, false);
1365                         RCU_INIT_POINTER(mvm->csa_tx_blocked_vif, NULL);
1366                 }
1367         }
1368
1369         return 0;
1370 }
1371
1372 static void iwl_mvm_beacon_loss_iterator(void *_data, u8 *mac,
1373                                          struct ieee80211_vif *vif)
1374 {
1375         struct iwl_missed_beacons_notif *missed_beacons = _data;
1376         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
1377         struct iwl_mvm *mvm = mvmvif->mvm;
1378         struct iwl_fw_dbg_trigger_missed_bcon *bcon_trig;
1379         struct iwl_fw_dbg_trigger_tlv *trigger;
1380         u32 stop_trig_missed_bcon, stop_trig_missed_bcon_since_rx;
1381         u32 rx_missed_bcon, rx_missed_bcon_since_rx;
1382
1383         if (mvmvif->id != (u16)le32_to_cpu(missed_beacons->mac_id))
1384                 return;
1385
1386         rx_missed_bcon = le32_to_cpu(missed_beacons->consec_missed_beacons);
1387         rx_missed_bcon_since_rx =
1388                 le32_to_cpu(missed_beacons->consec_missed_beacons_since_last_rx);
1389         /*
1390          * TODO: the threshold should be adjusted based on latency conditions,
1391          * and/or in case of a CS flow on one of the other AP vifs.
1392          */
1393         if (le32_to_cpu(missed_beacons->consec_missed_beacons_since_last_rx) >
1394              IWL_MVM_MISSED_BEACONS_THRESHOLD)
1395                 ieee80211_beacon_loss(vif);
1396
1397         if (!iwl_fw_dbg_trigger_enabled(mvm->fw,
1398                                         FW_DBG_TRIGGER_MISSED_BEACONS))
1399                 return;
1400
1401         trigger = iwl_fw_dbg_get_trigger(mvm->fw,
1402                                          FW_DBG_TRIGGER_MISSED_BEACONS);
1403         bcon_trig = (void *)trigger->data;
1404         stop_trig_missed_bcon = le32_to_cpu(bcon_trig->stop_consec_missed_bcon);
1405         stop_trig_missed_bcon_since_rx =
1406                 le32_to_cpu(bcon_trig->stop_consec_missed_bcon_since_rx);
1407
1408         /* TODO: implement start trigger */
1409
1410         if (!iwl_fw_dbg_trigger_check_stop(mvm, vif, trigger))
1411                 return;
1412
1413         if (rx_missed_bcon_since_rx >= stop_trig_missed_bcon_since_rx ||
1414             rx_missed_bcon >= stop_trig_missed_bcon)
1415                 iwl_mvm_fw_dbg_collect_trig(mvm, trigger, NULL);
1416 }
1417
1418 int iwl_mvm_rx_missed_beacons_notif(struct iwl_mvm *mvm,
1419                                     struct iwl_rx_cmd_buffer *rxb,
1420                                     struct iwl_device_cmd *cmd)
1421 {
1422         struct iwl_rx_packet *pkt = rxb_addr(rxb);
1423         struct iwl_missed_beacons_notif *mb = (void *)pkt->data;
1424
1425         IWL_DEBUG_INFO(mvm,
1426                        "missed bcn mac_id=%u, consecutive=%u (%u, %u, %u)\n",
1427                        le32_to_cpu(mb->mac_id),
1428                        le32_to_cpu(mb->consec_missed_beacons),
1429                        le32_to_cpu(mb->consec_missed_beacons_since_last_rx),
1430                        le32_to_cpu(mb->num_recvd_beacons),
1431                        le32_to_cpu(mb->num_expected_beacons));
1432
1433         ieee80211_iterate_active_interfaces_atomic(mvm->hw,
1434                                                    IEEE80211_IFACE_ITER_NORMAL,
1435                                                    iwl_mvm_beacon_loss_iterator,
1436                                                    mb);
1437         return 0;
1438 }