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  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of version 2 of the GNU General Public License as
  12  * published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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  20  * along with this program; if not, write to the Free Software
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  27  * Contact Information:
  28  *  Intel Linux Wireless <ilw@linux.intel.com>
  29  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
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  32  *
  33  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
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  41  *    notice, this list of conditions and the following disclaimer.
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  43  *    notice, this list of conditions and the following disclaimer in
  44  *    the documentation and/or other materials provided with the
  45  *    distribution.
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  47  *    contributors may be used to endorse or promote products derived
  48  *    from this software without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  51  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  52  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  53  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  54  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  55  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  56  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  57  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  58  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  59  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  60  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  61  *
  62  *****************************************************************************/
  63
  64 #include <linux/etherdevice.h>
  65 #include <net/mac80211.h>
  66 #include "iwl-io.h"
  67 #include "iwl-prph.h"
  68 #include "fw-api.h"
  69 #include "mvm.h"
  70 #include "time-event.h"
  71
  72 const u8 iwl_mvm_ac_to_tx_fifo[] = {
  73         IWL_MVM_TX_FIFO_VO,
  74         IWL_MVM_TX_FIFO_VI,
  75         IWL_MVM_TX_FIFO_BE,
  76         IWL_MVM_TX_FIFO_BK,
  77 };
  78
  79 struct iwl_mvm_mac_iface_iterator_data {
  80         struct iwl_mvm *mvm;
  81         struct ieee80211_vif *vif;
  82         unsigned long available_mac_ids[BITS_TO_LONGS(NUM_MAC_INDEX_DRIVER)];
  83         unsigned long available_tsf_ids[BITS_TO_LONGS(NUM_TSF_IDS)];
  84         unsigned long used_hw_queues[BITS_TO_LONGS(IWL_MVM_MAX_QUEUES)];
  85         enum iwl_tsf_id preferred_tsf;
  86         bool found_vif;
  87 };
  88
  89 static void iwl_mvm_mac_tsf_id_iter(void *_data, u8 *mac,
  90                                     struct ieee80211_vif *vif)
  91 {
  92         struct iwl_mvm_mac_iface_iterator_data *data = _data;
  93         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
  94         u16 min_bi;
  95
  96         /* Skip the interface for which we are trying to assign a tsf_id  */
  97         if (vif == data->vif)
  98                 return;
  99
 100         /*
 101          * The TSF is a hardware/firmware resource, there are 4 and
 102          * the driver should assign and free them as needed. However,
 103          * there are cases where 2 MACs should share the same TSF ID
 104          * for the purpose of clock sync, an optimization to avoid
 105          * clock drift causing overlapping TBTTs/DTIMs for a GO and
 106          * client in the system.
 107          *
 108          * The firmware will decide according to the MAC type which
 109          * will be the master and slave. Clients that need to sync
 110          * with a remote station will be the master, and an AP or GO
 111          * will be the slave.
 112          *
 113          * Depending on the new interface type it can be slaved to
 114          * or become the master of an existing interface.
 115          */
 116         switch (data->vif->type) {
 117         case NL80211_IFTYPE_STATION:
 118                 /*
 119                  * The new interface is a client, so if the one we're iterating
 120                  * is an AP, and the beacon interval of the AP is a multiple or
 121                  * divisor of the beacon interval of the client, the same TSF
 122                  * should be used to avoid drift between the new client and
 123                  * existing AP. The existing AP will get drift updates from the
 124                  * new client context in this case.
 125                  */
 126                 if (vif->type != NL80211_IFTYPE_AP ||
 127                     data->preferred_tsf != NUM_TSF_IDS ||
 128                     !test_bit(mvmvif->tsf_id, data->available_tsf_ids))
 129                         break;
 130
 131                 min_bi = min(data->vif->bss_conf.beacon_int,
 132                              vif->bss_conf.beacon_int);
 133
 134                 if (!min_bi)
 135                         break;
 136
 137                 if ((data->vif->bss_conf.beacon_int -
 138                      vif->bss_conf.beacon_int) % min_bi == 0) {
 139                         data->preferred_tsf = mvmvif->tsf_id;
 140                         return;
 141                 }
 142                 break;
 143
 144         case NL80211_IFTYPE_AP:
 145                 /*
 146                  * The new interface is AP/GO, so if its beacon interval is a
 147                  * multiple or a divisor of the beacon interval of an existing
 148                  * interface, it should get drift updates from an existing
 149                  * client or use the same TSF as an existing GO. There's no
 150                  * drift between TSFs internally but if they used different
 151                  * TSFs then a new client MAC could update one of them and
 152                  * cause drift that way.
 153                  */
 154                 if ((vif->type != NL80211_IFTYPE_AP &&
 155                      vif->type != NL80211_IFTYPE_STATION) ||
 156                     data->preferred_tsf != NUM_TSF_IDS ||
 157                     !test_bit(mvmvif->tsf_id, data->available_tsf_ids))
 158                         break;
 159
 160                 min_bi = min(data->vif->bss_conf.beacon_int,
 161                              vif->bss_conf.beacon_int);
 162
 163                 if (!min_bi)
 164                         break;
 165
 166                 if ((data->vif->bss_conf.beacon_int -
 167                      vif->bss_conf.beacon_int) % min_bi == 0) {
 168                         data->preferred_tsf = mvmvif->tsf_id;
 169                         return;
 170                 }
 171                 break;
 172         default:
 173                 /*
 174                  * For all other interface types there's no need to
 175                  * take drift into account. Either they're exclusive
 176                  * like IBSS and monitor, or we don't care much about
 177                  * their TSF (like P2P Device), but we won't be able
 178                  * to share the TSF resource.
 179                  */
 180                 break;
 181         }
 182
 183         /*
 184          * Unless we exited above, we can't share the TSF resource
 185          * that the virtual interface we're iterating over is using
 186          * with the new one, so clear the available bit and if this
 187          * was the preferred one, reset that as well.
 188          */
 189         __clear_bit(mvmvif->tsf_id, data->available_tsf_ids);
 190
 191         if (data->preferred_tsf == mvmvif->tsf_id)
 192                 data->preferred_tsf = NUM_TSF_IDS;
 193 }
 194
 195 static void iwl_mvm_mac_iface_iterator(void *_data, u8 *mac,
 196                                        struct ieee80211_vif *vif)
 197 {
 198         struct iwl_mvm_mac_iface_iterator_data *data = _data;
 199         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 200         u32 ac;
 201
 202         /* Iterator may already find the interface being added -- skip it */
 203         if (vif == data->vif) {
 204                 data->found_vif = true;
 205                 return;
 206         }
 207
 208         /* Mark the queues used by the vif */
 209         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
 210                 if (vif->hw_queue[ac] != IEEE80211_INVAL_HW_QUEUE)
 211                         __set_bit(vif->hw_queue[ac], data->used_hw_queues);
 212
 213         if (vif->cab_queue != IEEE80211_INVAL_HW_QUEUE)
 214                 __set_bit(vif->cab_queue, data->used_hw_queues);
 215
 216         /* Mark MAC IDs as used by clearing the available bit, and
 217          * (below) mark TSFs as used if their existing use is not
 218          * compatible with the new interface type.
 219          * No locking or atomic bit operations are needed since the
 220          * data is on the stack of the caller function.
 221          */
 222         __clear_bit(mvmvif->id, data->available_mac_ids);
 223
 224         /* find a suitable tsf_id */
 225         iwl_mvm_mac_tsf_id_iter(_data, mac, vif);
 226 }
 227
 228 /*
 229  * Get the mask of the queus used by the vif
 230  */
 231 u32 iwl_mvm_mac_get_queues_mask(struct iwl_mvm *mvm,
 232                                 struct ieee80211_vif *vif)
 233 {
 234         u32 qmask = 0, ac;
 235
 236         if (vif->type == NL80211_IFTYPE_P2P_DEVICE)
 237                 return BIT(IWL_MVM_OFFCHANNEL_QUEUE);
 238
 239         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
 240                 if (vif->hw_queue[ac] != IEEE80211_INVAL_HW_QUEUE)
 241                         qmask |= BIT(vif->hw_queue[ac]);
 242
 243         return qmask;
 244 }
 245
 246 void iwl_mvm_mac_ctxt_recalc_tsf_id(struct iwl_mvm *mvm,
 247                                     struct ieee80211_vif *vif)
 248 {
 249         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 250         struct iwl_mvm_mac_iface_iterator_data data = {
 251                 .mvm = mvm,
 252                 .vif = vif,
 253                 .available_tsf_ids = { (1 << NUM_TSF_IDS) - 1 },
 254                 /* no preference yet */
 255                 .preferred_tsf = NUM_TSF_IDS,
 256         };
 257
 258         ieee80211_iterate_active_interfaces_atomic(
 259                 mvm->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
 260                 iwl_mvm_mac_tsf_id_iter, &data);
 261
 262         if (data.preferred_tsf != NUM_TSF_IDS)
 263                 mvmvif->tsf_id = data.preferred_tsf;
 264         else if (!test_bit(mvmvif->tsf_id, data.available_tsf_ids))
 265                 mvmvif->tsf_id = find_first_bit(data.available_tsf_ids,
 266                                                 NUM_TSF_IDS);
 267 }
 268
 269 static int iwl_mvm_mac_ctxt_allocate_resources(struct iwl_mvm *mvm,
 270                                                struct ieee80211_vif *vif)
 271 {
 272         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 273         struct iwl_mvm_mac_iface_iterator_data data = {
 274                 .mvm = mvm,
 275                 .vif = vif,
 276                 .available_mac_ids = { (1 << NUM_MAC_INDEX_DRIVER) - 1 },
 277                 .available_tsf_ids = { (1 << NUM_TSF_IDS) - 1 },
 278                 /* no preference yet */
 279                 .preferred_tsf = NUM_TSF_IDS,
 280                 .used_hw_queues = {
 281                         BIT(IWL_MVM_OFFCHANNEL_QUEUE) |
 282                         BIT(mvm->aux_queue) |
 283                         BIT(IWL_MVM_CMD_QUEUE)
 284                 },
 285                 .found_vif = false,
 286         };
 287         u32 ac;
 288         int ret, i;
 289
 290         /*
 291          * Allocate a MAC ID and a TSF for this MAC, along with the queues
 292          * and other resources.
 293          */
 294
 295         /*
 296          * Before the iterator, we start with all MAC IDs and TSFs available.
 297          *
 298          * During iteration, all MAC IDs are cleared that are in use by other
 299          * virtual interfaces, and all TSF IDs are cleared that can't be used
 300          * by this new virtual interface because they're used by an interface
 301          * that can't share it with the new one.
 302          * At the same time, we check if there's a preferred TSF in the case
 303          * that we should share it with another interface.
 304          */
 305
 306         /* Currently, MAC ID 0 should be used only for the managed/IBSS vif */
 307         switch (vif->type) {
 308         case NL80211_IFTYPE_ADHOC:
 309                 break;
 310         case NL80211_IFTYPE_STATION:
 311                 if (!vif->p2p)
 312                         break;
 313                 /* fall through */
 314         default:
 315                 __clear_bit(0, data.available_mac_ids);
 316         }
 317
 318         ieee80211_iterate_active_interfaces_atomic(
 319                 mvm->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
 320                 iwl_mvm_mac_iface_iterator, &data);
 321
 322         /*
 323          * In the case we're getting here during resume, it's similar to
 324          * firmware restart, and with RESUME_ALL the iterator will find
 325          * the vif being added already.
 326          * We don't want to reassign any IDs in either case since doing
 327          * so would probably assign different IDs (as interfaces aren't
 328          * necessarily added in the same order), but the old IDs were
 329          * preserved anyway, so skip ID assignment for both resume and
 330          * recovery.
 331          */
 332         if (data.found_vif)
 333                 return 0;
 334
 335         /* Therefore, in recovery, we can't get here */
 336         if (WARN_ON_ONCE(test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status)))
 337                 return -EBUSY;
 338
 339         mvmvif->id = find_first_bit(data.available_mac_ids,
 340                                     NUM_MAC_INDEX_DRIVER);
 341         if (mvmvif->id == NUM_MAC_INDEX_DRIVER) {
 342                 IWL_ERR(mvm, "Failed to init MAC context - no free ID!\n");
 343                 ret = -EIO;
 344                 goto exit_fail;
 345         }
 346
 347         if (data.preferred_tsf != NUM_TSF_IDS)
 348                 mvmvif->tsf_id = data.preferred_tsf;
 349         else
 350                 mvmvif->tsf_id = find_first_bit(data.available_tsf_ids,
 351                                                 NUM_TSF_IDS);
 352         if (mvmvif->tsf_id == NUM_TSF_IDS) {
 353                 IWL_ERR(mvm, "Failed to init MAC context - no free TSF!\n");
 354                 ret = -EIO;
 355                 goto exit_fail;
 356         }
 357
 358         mvmvif->color = 0;
 359
 360         INIT_LIST_HEAD(&mvmvif->time_event_data.list);
 361         mvmvif->time_event_data.id = TE_MAX;
 362
 363         /* No need to allocate data queues to P2P Device MAC.*/
 364         if (vif->type == NL80211_IFTYPE_P2P_DEVICE) {
 365                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
 366                         vif->hw_queue[ac] = IEEE80211_INVAL_HW_QUEUE;
 367
 368                 return 0;
 369         }
 370
 371         /* Find available queues, and allocate them to the ACs */
 372         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
 373                 u8 queue = find_first_zero_bit(data.used_hw_queues,
 374                                                mvm->first_agg_queue);
 375
 376                 if (queue >= mvm->first_agg_queue) {
 377                         IWL_ERR(mvm, "Failed to allocate queue\n");
 378                         ret = -EIO;
 379                         goto exit_fail;
 380                 }
 381
 382                 __set_bit(queue, data.used_hw_queues);
 383                 vif->hw_queue[ac] = queue;
 384         }
 385
 386         /* Allocate the CAB queue for softAP and GO interfaces */
 387         if (vif->type == NL80211_IFTYPE_AP) {
 388                 u8 queue = find_first_zero_bit(data.used_hw_queues,
 389                                                mvm->first_agg_queue);
 390
 391                 if (queue >= mvm->first_agg_queue) {
 392                         IWL_ERR(mvm, "Failed to allocate cab queue\n");
 393                         ret = -EIO;
 394                         goto exit_fail;
 395                 }
 396
 397                 vif->cab_queue = queue;
 398         } else {
 399                 vif->cab_queue = IEEE80211_INVAL_HW_QUEUE;
 400         }
 401
 402         mvmvif->bcast_sta.sta_id = IWL_MVM_STATION_COUNT;
 403         mvmvif->ap_sta_id = IWL_MVM_STATION_COUNT;
 404
 405         for (i = 0; i < NUM_IWL_MVM_SMPS_REQ; i++)
 406                 mvmvif->smps_requests[i] = IEEE80211_SMPS_AUTOMATIC;
 407
 408         return 0;
 409
 410 exit_fail:
 411         memset(mvmvif, 0, sizeof(struct iwl_mvm_vif));
 412         memset(vif->hw_queue, IEEE80211_INVAL_HW_QUEUE, sizeof(vif->hw_queue));
 413         vif->cab_queue = IEEE80211_INVAL_HW_QUEUE;
 414         return ret;
 415 }
 416
 417 int iwl_mvm_mac_ctxt_init(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
 418 {
 419         u32 ac;
 420         int ret;
 421
 422         lockdep_assert_held(&mvm->mutex);
 423
 424         ret = iwl_mvm_mac_ctxt_allocate_resources(mvm, vif);
 425         if (ret)
 426                 return ret;
 427
 428         switch (vif->type) {
 429         case NL80211_IFTYPE_P2P_DEVICE:
 430                 iwl_trans_ac_txq_enable(mvm->trans, IWL_MVM_OFFCHANNEL_QUEUE,
 431                                         IWL_MVM_TX_FIFO_VO);
 432                 break;
 433         case NL80211_IFTYPE_AP:
 434                 iwl_trans_ac_txq_enable(mvm->trans, vif->cab_queue,
 435                                         IWL_MVM_TX_FIFO_MCAST);
 436                 /* fall through */
 437         default:
 438                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
 439                         iwl_trans_ac_txq_enable(mvm->trans, vif->hw_queue[ac],
 440                                                 iwl_mvm_ac_to_tx_fifo[ac]);
 441                 break;
 442         }
 443
 444         return 0;
 445 }
 446
 447 void iwl_mvm_mac_ctxt_release(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
 448 {
 449         int ac;
 450
 451         lockdep_assert_held(&mvm->mutex);
 452
 453         switch (vif->type) {
 454         case NL80211_IFTYPE_P2P_DEVICE:
 455                 iwl_trans_txq_disable(mvm->trans, IWL_MVM_OFFCHANNEL_QUEUE);
 456                 break;
 457         case NL80211_IFTYPE_AP:
 458                 iwl_trans_txq_disable(mvm->trans, vif->cab_queue);
 459                 /* fall through */
 460         default:
 461                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
 462                         iwl_trans_txq_disable(mvm->trans, vif->hw_queue[ac]);
 463         }
 464 }
 465
 466 static void iwl_mvm_ack_rates(struct iwl_mvm *mvm,
 467                               struct ieee80211_vif *vif,
 468                               enum ieee80211_band band,
 469                               u8 *cck_rates, u8 *ofdm_rates)
 470 {
 471         struct ieee80211_supported_band *sband;
 472         unsigned long basic = vif->bss_conf.basic_rates;
 473         int lowest_present_ofdm = 100;
 474         int lowest_present_cck = 100;
 475         u8 cck = 0;
 476         u8 ofdm = 0;
 477         int i;
 478
 479         sband = mvm->hw->wiphy->bands[band];
 480
 481         for_each_set_bit(i, &basic, BITS_PER_LONG) {
 482                 int hw = sband->bitrates[i].hw_value;
 483                 if (hw >= IWL_FIRST_OFDM_RATE) {
 484                         ofdm |= BIT(hw - IWL_FIRST_OFDM_RATE);
 485                         if (lowest_present_ofdm > hw)
 486                                 lowest_present_ofdm = hw;
 487                 } else {
 488                         BUILD_BUG_ON(IWL_FIRST_CCK_RATE != 0);
 489
 490                         cck |= BIT(hw);
 491                         if (lowest_present_cck > hw)
 492                                 lowest_present_cck = hw;
 493                 }
 494         }
 495
 496         /*
 497          * Now we've got the basic rates as bitmaps in the ofdm and cck
 498          * variables. This isn't sufficient though, as there might not
 499          * be all the right rates in the bitmap. E.g. if the only basic
 500          * rates are 5.5 Mbps and 11 Mbps, we still need to add 1 Mbps
 501          * and 6 Mbps because the 802.11-2007 standard says in 9.6:
 502          *
 503          *    [...] a STA responding to a received frame shall transmit
 504          *    its Control Response frame [...] at the highest rate in the
 505          *    BSSBasicRateSet parameter that is less than or equal to the
 506          *    rate of the immediately previous frame in the frame exchange
 507          *    sequence ([...]) and that is of the same modulation class
 508          *    ([...]) as the received frame. If no rate contained in the
 509          *    BSSBasicRateSet parameter meets these conditions, then the
 510          *    control frame sent in response to a received frame shall be
 511          *    transmitted at the highest mandatory rate of the PHY that is
 512          *    less than or equal to the rate of the received frame, and
 513          *    that is of the same modulation class as the received frame.
 514          *
 515          * As a consequence, we need to add all mandatory rates that are
 516          * lower than all of the basic rates to these bitmaps.
 517          */
 518
 519         if (IWL_RATE_24M_INDEX < lowest_present_ofdm)
 520                 ofdm |= IWL_RATE_BIT_MSK(24) >> IWL_FIRST_OFDM_RATE;
 521         if (IWL_RATE_12M_INDEX < lowest_present_ofdm)
 522                 ofdm |= IWL_RATE_BIT_MSK(12) >> IWL_FIRST_OFDM_RATE;
 523         /* 6M already there or needed so always add */
 524         ofdm |= IWL_RATE_BIT_MSK(6) >> IWL_FIRST_OFDM_RATE;
 525
 526         /*
 527          * CCK is a bit more complex with DSSS vs. HR/DSSS vs. ERP.
 528          * Note, however:
 529          *  - if no CCK rates are basic, it must be ERP since there must
 530          *    be some basic rates at all, so they're OFDM => ERP PHY
 531          *    (or we're in 5 GHz, and the cck bitmap will never be used)
 532          *  - if 11M is a basic rate, it must be ERP as well, so add 5.5M
 533          *  - if 5.5M is basic, 1M and 2M are mandatory
 534          *  - if 2M is basic, 1M is mandatory
 535          *  - if 1M is basic, that's the only valid ACK rate.
 536          * As a consequence, it's not as complicated as it sounds, just add
 537          * any lower rates to the ACK rate bitmap.
 538          */
 539         if (IWL_RATE_11M_INDEX < lowest_present_cck)
 540                 cck |= IWL_RATE_BIT_MSK(11) >> IWL_FIRST_CCK_RATE;
 541         if (IWL_RATE_5M_INDEX < lowest_present_cck)
 542                 cck |= IWL_RATE_BIT_MSK(5) >> IWL_FIRST_CCK_RATE;
 543         if (IWL_RATE_2M_INDEX < lowest_present_cck)
 544                 cck |= IWL_RATE_BIT_MSK(2) >> IWL_FIRST_CCK_RATE;
 545         /* 1M already there or needed so always add */
 546         cck |= IWL_RATE_BIT_MSK(1) >> IWL_FIRST_CCK_RATE;
 547
 548         *cck_rates = cck;
 549         *ofdm_rates = ofdm;
 550 }
 551
 552 static void iwl_mvm_mac_ctxt_set_ht_flags(struct iwl_mvm *mvm,
 553                                          struct ieee80211_vif *vif,
 554                                          struct iwl_mac_ctx_cmd *cmd)
 555 {
 556         /* for both sta and ap, ht_operation_mode hold the protection_mode */
 557         u8 protection_mode = vif->bss_conf.ht_operation_mode &
 558                                  IEEE80211_HT_OP_MODE_PROTECTION;
 559         /* The fw does not distinguish between ht and fat */
 560         u32 ht_flag = MAC_PROT_FLG_HT_PROT | MAC_PROT_FLG_FAT_PROT;
 561
 562         IWL_DEBUG_RATE(mvm, "protection mode set to %d\n", protection_mode);
 563         /*
 564          * See section 9.23.3.1 of IEEE 80211-2012.
 565          * Nongreenfield HT STAs Present is not supported.
 566          */
 567         switch (protection_mode) {
 568         case IEEE80211_HT_OP_MODE_PROTECTION_NONE:
 569                 break;
 570         case IEEE80211_HT_OP_MODE_PROTECTION_NONMEMBER:
 571         case IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED:
 572                 cmd->protection_flags |= cpu_to_le32(ht_flag);
 573                 break;
 574         case IEEE80211_HT_OP_MODE_PROTECTION_20MHZ:
 575                 /* Protect when channel wider than 20MHz */
 576                 if (vif->bss_conf.chandef.width > NL80211_CHAN_WIDTH_20)
 577                         cmd->protection_flags |= cpu_to_le32(ht_flag);
 578                 break;
 579         default:
 580                 IWL_ERR(mvm, "Illegal protection mode %d\n",
 581                         protection_mode);
 582                 break;
 583         }
 584 }
 585
 586 static void iwl_mvm_mac_ctxt_cmd_common(struct iwl_mvm *mvm,
 587                                         struct ieee80211_vif *vif,
 588                                         struct iwl_mac_ctx_cmd *cmd,
 589                                         u32 action)
 590 {
 591         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 592         struct ieee80211_chanctx_conf *chanctx;
 593         bool ht_enabled = !!(vif->bss_conf.ht_operation_mode &
 594                              IEEE80211_HT_OP_MODE_PROTECTION);
 595         u8 cck_ack_rates, ofdm_ack_rates;
 596         int i;
 597
 598         cmd->id_and_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id,
 599                                                             mvmvif->color));
 600         cmd->action = cpu_to_le32(action);
 601
 602         switch (vif->type) {
 603         case NL80211_IFTYPE_STATION:
 604                 if (vif->p2p)
 605                         cmd->mac_type = cpu_to_le32(FW_MAC_TYPE_P2P_STA);
 606                 else
 607                         cmd->mac_type = cpu_to_le32(FW_MAC_TYPE_BSS_STA);
 608                 break;
 609         case NL80211_IFTYPE_AP:
 610                 cmd->mac_type = cpu_to_le32(FW_MAC_TYPE_GO);
 611                 break;
 612         case NL80211_IFTYPE_MONITOR:
 613                 cmd->mac_type = cpu_to_le32(FW_MAC_TYPE_LISTENER);
 614                 break;
 615         case NL80211_IFTYPE_P2P_DEVICE:
 616                 cmd->mac_type = cpu_to_le32(FW_MAC_TYPE_P2P_DEVICE);
 617                 break;
 618         case NL80211_IFTYPE_ADHOC:
 619                 cmd->mac_type = cpu_to_le32(FW_MAC_TYPE_IBSS);
 620                 break;
 621         default:
 622                 WARN_ON_ONCE(1);
 623         }
 624
 625         cmd->tsf_id = cpu_to_le32(mvmvif->tsf_id);
 626
 627         memcpy(cmd->node_addr, vif->addr, ETH_ALEN);
 628         if (vif->bss_conf.bssid)
 629                 memcpy(cmd->bssid_addr, vif->bss_conf.bssid, ETH_ALEN);
 630         else
 631                 eth_broadcast_addr(cmd->bssid_addr);
 632
 633         rcu_read_lock();
 634         chanctx = rcu_dereference(vif->chanctx_conf);
 635         iwl_mvm_ack_rates(mvm, vif, chanctx ? chanctx->def.chan->band
 636                                             : IEEE80211_BAND_2GHZ,
 637                           &cck_ack_rates, &ofdm_ack_rates);
 638         rcu_read_unlock();
 639
 640         cmd->cck_rates = cpu_to_le32((u32)cck_ack_rates);
 641         cmd->ofdm_rates = cpu_to_le32((u32)ofdm_ack_rates);
 642
 643         cmd->cck_short_preamble =
 644                 cpu_to_le32(vif->bss_conf.use_short_preamble ?
 645                             MAC_FLG_SHORT_PREAMBLE : 0);
 646         cmd->short_slot =
 647                 cpu_to_le32(vif->bss_conf.use_short_slot ?
 648                             MAC_FLG_SHORT_SLOT : 0);
 649
 650         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 651                 u8 txf = iwl_mvm_ac_to_tx_fifo[i];
 652
 653                 cmd->ac[txf].cw_min =
 654                         cpu_to_le16(mvmvif->queue_params[i].cw_min);
 655                 cmd->ac[txf].cw_max =
 656                         cpu_to_le16(mvmvif->queue_params[i].cw_max);
 657                 cmd->ac[txf].edca_txop =
 658                         cpu_to_le16(mvmvif->queue_params[i].txop * 32);
 659                 cmd->ac[txf].aifsn = mvmvif->queue_params[i].aifs;
 660                 cmd->ac[txf].fifos_mask = BIT(txf);
 661         }
 662
 663         /* in AP mode, the MCAST FIFO takes the EDCA params from VO */
 664         if (vif->type == NL80211_IFTYPE_AP)
 665                 cmd->ac[IWL_MVM_TX_FIFO_VO].fifos_mask |=
 666                         BIT(IWL_MVM_TX_FIFO_MCAST);
 667
 668         if (vif->bss_conf.qos)
 669                 cmd->qos_flags |= cpu_to_le32(MAC_QOS_FLG_UPDATE_EDCA);
 670
 671         if (vif->bss_conf.use_cts_prot)
 672                 cmd->protection_flags |= cpu_to_le32(MAC_PROT_FLG_TGG_PROTECT);
 673
 674         IWL_DEBUG_RATE(mvm, "use_cts_prot %d, ht_operation_mode %d\n",
 675                        vif->bss_conf.use_cts_prot,
 676                        vif->bss_conf.ht_operation_mode);
 677         if (vif->bss_conf.chandef.width != NL80211_CHAN_WIDTH_20_NOHT)
 678                 cmd->qos_flags |= cpu_to_le32(MAC_QOS_FLG_TGN);
 679         if (ht_enabled)
 680                 iwl_mvm_mac_ctxt_set_ht_flags(mvm, vif, cmd);
 681
 682         cmd->filter_flags = cpu_to_le32(MAC_FILTER_ACCEPT_GRP);
 683 }
 684
 685 static int iwl_mvm_mac_ctxt_send_cmd(struct iwl_mvm *mvm,
 686                                      struct iwl_mac_ctx_cmd *cmd)
 687 {
 688         int ret = iwl_mvm_send_cmd_pdu(mvm, MAC_CONTEXT_CMD, 0,
 689                                        sizeof(*cmd), cmd);
 690         if (ret)
 691                 IWL_ERR(mvm, "Failed to send MAC context (action:%d): %d\n",
 692                         le32_to_cpu(cmd->action), ret);
 693         return ret;
 694 }
 695
 696 static int iwl_mvm_mac_ctxt_cmd_sta(struct iwl_mvm *mvm,
 697                                     struct ieee80211_vif *vif,
 698                                     u32 action, bool force_assoc_off)
 699 {
 700         struct iwl_mac_ctx_cmd cmd = {};
 701         struct iwl_mac_data_sta *ctxt_sta;
 702
 703         WARN_ON(vif->type != NL80211_IFTYPE_STATION);
 704
 705         /* Fill the common data for all mac context types */
 706         iwl_mvm_mac_ctxt_cmd_common(mvm, vif, &cmd, action);
 707
 708         if (vif->p2p) {
 709                 struct ieee80211_p2p_noa_attr *noa =
 710                         &vif->bss_conf.p2p_noa_attr;
 711
 712                 cmd.p2p_sta.ctwin = cpu_to_le32(noa->oppps_ctwindow &
 713                                         IEEE80211_P2P_OPPPS_CTWINDOW_MASK);
 714                 ctxt_sta = &cmd.p2p_sta.sta;
 715         } else {
 716                 ctxt_sta = &cmd.sta;
 717         }
 718
 719         /* We need the dtim_period to set the MAC as associated */
 720         if (vif->bss_conf.assoc && vif->bss_conf.dtim_period &&
 721             !force_assoc_off) {
 722                 u32 dtim_offs;
 723
 724                 /*
 725                  * The DTIM count counts down, so when it is N that means N
 726                  * more beacon intervals happen until the DTIM TBTT. Therefore
 727                  * add this to the current time. If that ends up being in the
 728                  * future, the firmware will handle it.
 729                  *
 730                  * Also note that the system_timestamp (which we get here as
 731                  * "sync_device_ts") and TSF timestamp aren't at exactly the
 732                  * same offset in the frame -- the TSF is at the first symbol
 733                  * of the TSF, the system timestamp is at signal acquisition
 734                  * time. This means there's an offset between them of at most
 735                  * a few hundred microseconds (24 * 8 bits + PLCP time gives
 736                  * 384us in the longest case), this is currently not relevant
 737                  * as the firmware wakes up around 2ms before the TBTT.
 738                  */
 739                 dtim_offs = vif->bss_conf.sync_dtim_count *
 740                                 vif->bss_conf.beacon_int;
 741                 /* convert TU to usecs */
 742                 dtim_offs *= 1024;
 743
 744                 ctxt_sta->dtim_tsf =
 745                         cpu_to_le64(vif->bss_conf.sync_tsf + dtim_offs);
 746                 ctxt_sta->dtim_time =
 747                         cpu_to_le32(vif->bss_conf.sync_device_ts + dtim_offs);
 748
 749                 IWL_DEBUG_INFO(mvm, "DTIM TBTT is 0x%llx/0x%x, offset %d\n",
 750                                le64_to_cpu(ctxt_sta->dtim_tsf),
 751                                le32_to_cpu(ctxt_sta->dtim_time),
 752                                dtim_offs);
 753
 754                 ctxt_sta->is_assoc = cpu_to_le32(1);
 755         } else {
 756                 ctxt_sta->is_assoc = cpu_to_le32(0);
 757
 758                 /* Allow beacons to pass through as long as we are not
 759                  * associated, or we do not have dtim period information.
 760                  */
 761                 cmd.filter_flags |= cpu_to_le32(MAC_FILTER_IN_BEACON);
 762         }
 763
 764         ctxt_sta->bi = cpu_to_le32(vif->bss_conf.beacon_int);
 765         ctxt_sta->bi_reciprocal =
 766                 cpu_to_le32(iwl_mvm_reciprocal(vif->bss_conf.beacon_int));
 767         ctxt_sta->dtim_interval = cpu_to_le32(vif->bss_conf.beacon_int *
 768                                               vif->bss_conf.dtim_period);
 769         ctxt_sta->dtim_reciprocal =
 770                 cpu_to_le32(iwl_mvm_reciprocal(vif->bss_conf.beacon_int *
 771                                                vif->bss_conf.dtim_period));
 772
 773         ctxt_sta->listen_interval = cpu_to_le32(mvm->hw->conf.listen_interval);
 774         ctxt_sta->assoc_id = cpu_to_le32(vif->bss_conf.aid);
 775
 776         return iwl_mvm_mac_ctxt_send_cmd(mvm, &cmd);
 777 }
 778
 779 static int iwl_mvm_mac_ctxt_cmd_listener(struct iwl_mvm *mvm,
 780                                          struct ieee80211_vif *vif,
 781                                          u32 action)
 782 {
 783         struct iwl_mac_ctx_cmd cmd = {};
 784
 785         WARN_ON(vif->type != NL80211_IFTYPE_MONITOR);
 786
 787         iwl_mvm_mac_ctxt_cmd_common(mvm, vif, &cmd, action);
 788
 789         cmd.filter_flags = cpu_to_le32(MAC_FILTER_IN_PROMISC |
 790                                        MAC_FILTER_IN_CONTROL_AND_MGMT |
 791                                        MAC_FILTER_IN_BEACON |
 792                                        MAC_FILTER_IN_PROBE_REQUEST |
 793                                        MAC_FILTER_IN_CRC32);
 794         mvm->hw->flags |= IEEE80211_HW_RX_INCLUDES_FCS;
 795
 796         return iwl_mvm_mac_ctxt_send_cmd(mvm, &cmd);
 797 }
 798
 799 static int iwl_mvm_mac_ctxt_cmd_ibss(struct iwl_mvm *mvm,
 800                                      struct ieee80211_vif *vif,
 801                                      u32 action)
 802 {
 803         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 804         struct iwl_mac_ctx_cmd cmd = {};
 805
 806         WARN_ON(vif->type != NL80211_IFTYPE_ADHOC);
 807
 808         iwl_mvm_mac_ctxt_cmd_common(mvm, vif, &cmd, action);
 809
 810         cmd.filter_flags = cpu_to_le32(MAC_FILTER_IN_BEACON |
 811                                        MAC_FILTER_IN_PROBE_REQUEST);
 812
 813         /* cmd.ibss.beacon_time/cmd.ibss.beacon_tsf are curently ignored */
 814         cmd.ibss.bi = cpu_to_le32(vif->bss_conf.beacon_int);
 815         cmd.ibss.bi_reciprocal =
 816                 cpu_to_le32(iwl_mvm_reciprocal(vif->bss_conf.beacon_int));
 817
 818         /* TODO: Assumes that the beacon id == mac context id */
 819         cmd.ibss.beacon_template = cpu_to_le32(mvmvif->id);
 820
 821         return iwl_mvm_mac_ctxt_send_cmd(mvm, &cmd);
 822 }
 823
 824 struct iwl_mvm_go_iterator_data {
 825         bool go_active;
 826 };
 827
 828 static void iwl_mvm_go_iterator(void *_data, u8 *mac, struct ieee80211_vif *vif)
 829 {
 830         struct iwl_mvm_go_iterator_data *data = _data;
 831         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 832
 833         if (vif->type == NL80211_IFTYPE_AP && vif->p2p &&
 834             mvmvif->ap_ibss_active)
 835                 data->go_active = true;
 836 }
 837
 838 static int iwl_mvm_mac_ctxt_cmd_p2p_device(struct iwl_mvm *mvm,
 839                                            struct ieee80211_vif *vif,
 840                                            u32 action)
 841 {
 842         struct iwl_mac_ctx_cmd cmd = {};
 843         struct iwl_mvm_go_iterator_data data = {};
 844
 845         WARN_ON(vif->type != NL80211_IFTYPE_P2P_DEVICE);
 846
 847         iwl_mvm_mac_ctxt_cmd_common(mvm, vif, &cmd, action);
 848
 849         cmd.protection_flags |= cpu_to_le32(MAC_PROT_FLG_TGG_PROTECT);
 850
 851         /* Override the filter flags to accept only probe requests */
 852         cmd.filter_flags = cpu_to_le32(MAC_FILTER_IN_PROBE_REQUEST);
 853
 854         /*
 855          * This flag should be set to true when the P2P Device is
 856          * discoverable and there is at least another active P2P GO. Settings
 857          * this flag will allow the P2P Device to be discoverable on other
 858          * channels in addition to its listen channel.
 859          * Note that this flag should not be set in other cases as it opens the
 860          * Rx filters on all MAC and increases the number of interrupts.
 861          */
 862         ieee80211_iterate_active_interfaces_atomic(
 863                 mvm->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
 864                 iwl_mvm_go_iterator, &data);
 865
 866         cmd.p2p_dev.is_disc_extended = cpu_to_le32(data.go_active ? 1 : 0);
 867         return iwl_mvm_mac_ctxt_send_cmd(mvm, &cmd);
 868 }
 869
 870 static void iwl_mvm_mac_ctxt_set_tim(struct iwl_mvm *mvm,
 871                                      struct iwl_mac_beacon_cmd *beacon_cmd,
 872                                      u8 *beacon, u32 frame_size)
 873 {
 874         u32 tim_idx;
 875         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)beacon;
 876
 877         /* The index is relative to frame start but we start looking at the
 878          * variable-length part of the beacon. */
 879         tim_idx = mgmt->u.beacon.variable - beacon;
 880
 881         /* Parse variable-length elements of beacon to find WLAN_EID_TIM */
 882         while ((tim_idx < (frame_size - 2)) &&
 883                         (beacon[tim_idx] != WLAN_EID_TIM))
 884                 tim_idx += beacon[tim_idx+1] + 2;
 885
 886         /* If TIM field was found, set variables */
 887         if ((tim_idx < (frame_size - 1)) && (beacon[tim_idx] == WLAN_EID_TIM)) {
 888                 beacon_cmd->tim_idx = cpu_to_le32(tim_idx);
 889                 beacon_cmd->tim_size = cpu_to_le32((u32)beacon[tim_idx+1]);
 890         } else {
 891                 IWL_WARN(mvm, "Unable to find TIM Element in beacon\n");
 892         }
 893 }
 894
 895 static int iwl_mvm_mac_ctxt_send_beacon(struct iwl_mvm *mvm,
 896                                         struct ieee80211_vif *vif,
 897                                         struct sk_buff *beacon)
 898 {
 899         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 900         struct iwl_host_cmd cmd = {
 901                 .id = BEACON_TEMPLATE_CMD,
 902                 .flags = CMD_ASYNC,
 903         };
 904         struct iwl_mac_beacon_cmd beacon_cmd = {};
 905         struct ieee80211_tx_info *info;
 906         u32 beacon_skb_len;
 907         u32 rate, tx_flags;
 908
 909         if (WARN_ON(!beacon))
 910                 return -EINVAL;
 911
 912         beacon_skb_len = beacon->len;
 913
 914         /* TODO: for now the beacon template id is set to be the mac context id.
 915          * Might be better to handle it as another resource ... */
 916         beacon_cmd.template_id = cpu_to_le32((u32)mvmvif->id);
 917         info = IEEE80211_SKB_CB(beacon);
 918
 919         /* Set up TX command fields */
 920         beacon_cmd.tx.len = cpu_to_le16((u16)beacon_skb_len);
 921         beacon_cmd.tx.sta_id = mvmvif->bcast_sta.sta_id;
 922         beacon_cmd.tx.life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
 923         tx_flags = TX_CMD_FLG_SEQ_CTL | TX_CMD_FLG_TSF;
 924         tx_flags |=
 925                 iwl_mvm_bt_coex_tx_prio(mvm, (void *)beacon->data, info, 0) <<
 926                                                 TX_CMD_FLG_BT_PRIO_POS;
 927         beacon_cmd.tx.tx_flags = cpu_to_le32(tx_flags);
 928
 929         mvm->mgmt_last_antenna_idx =
 930                 iwl_mvm_next_antenna(mvm, mvm->fw->valid_tx_ant,
 931                                      mvm->mgmt_last_antenna_idx);
 932
 933         beacon_cmd.tx.rate_n_flags =
 934                 cpu_to_le32(BIT(mvm->mgmt_last_antenna_idx) <<
 935                             RATE_MCS_ANT_POS);
 936
 937         if (info->band == IEEE80211_BAND_5GHZ || vif->p2p) {
 938                 rate = IWL_FIRST_OFDM_RATE;
 939         } else {
 940                 rate = IWL_FIRST_CCK_RATE;
 941                 beacon_cmd.tx.rate_n_flags |= cpu_to_le32(RATE_MCS_CCK_MSK);
 942         }
 943         beacon_cmd.tx.rate_n_flags |=
 944                 cpu_to_le32(iwl_mvm_mac80211_idx_to_hwrate(rate));
 945
 946         /* Set up TX beacon command fields */
 947         if (vif->type == NL80211_IFTYPE_AP)
 948                 iwl_mvm_mac_ctxt_set_tim(mvm, &beacon_cmd,
 949                                          beacon->data,
 950                                          beacon_skb_len);
 951
 952         /* Submit command */
 953         cmd.len[0] = sizeof(beacon_cmd);
 954         cmd.data[0] = &beacon_cmd;
 955         cmd.dataflags[0] = 0;
 956         cmd.len[1] = beacon_skb_len;
 957         cmd.data[1] = beacon->data;
 958         cmd.dataflags[1] = IWL_HCMD_DFL_DUP;
 959
 960         return iwl_mvm_send_cmd(mvm, &cmd);
 961 }
 962
 963 /* The beacon template for the AP/GO/IBSS has changed and needs update */
 964 int iwl_mvm_mac_ctxt_beacon_changed(struct iwl_mvm *mvm,
 965                                     struct ieee80211_vif *vif)
 966 {
 967         struct sk_buff *beacon;
 968         int ret;
 969
 970         WARN_ON(vif->type != NL80211_IFTYPE_AP &&
 971                 vif->type != NL80211_IFTYPE_ADHOC);
 972
 973         beacon = ieee80211_beacon_get_template(mvm->hw, vif, NULL);
 974         if (!beacon)
 975                 return -ENOMEM;
 976
 977         ret = iwl_mvm_mac_ctxt_send_beacon(mvm, vif, beacon);
 978         dev_kfree_skb(beacon);
 979         return ret;
 980 }
 981
 982 struct iwl_mvm_mac_ap_iterator_data {
 983         struct iwl_mvm *mvm;
 984         struct ieee80211_vif *vif;
 985         u32 beacon_device_ts;
 986         u16 beacon_int;
 987 };
 988
 989 /* Find the beacon_device_ts and beacon_int for a managed interface */
 990 static void iwl_mvm_mac_ap_iterator(void *_data, u8 *mac,
 991                                     struct ieee80211_vif *vif)
 992 {
 993         struct iwl_mvm_mac_ap_iterator_data *data = _data;
 994
 995         if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc)
 996                 return;
 997
 998         /* Station client has higher priority over P2P client*/
 999         if (vif->p2p && data->beacon_device_ts)
1000                 return;
1001
1002         data->beacon_device_ts = vif->bss_conf.sync_device_ts;
1003         data->beacon_int = vif->bss_conf.beacon_int;
1004 }
1005
1006 /*
1007  * Fill the specific data for mac context of type AP of P2P GO
1008  */
1009 static void iwl_mvm_mac_ctxt_cmd_fill_ap(struct iwl_mvm *mvm,
1010                                          struct ieee80211_vif *vif,
1011                                          struct iwl_mac_data_ap *ctxt_ap,
1012                                          bool add)
1013 {
1014         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
1015         struct iwl_mvm_mac_ap_iterator_data data = {
1016                 .mvm = mvm,
1017                 .vif = vif,
1018                 .beacon_device_ts = 0
1019         };
1020
1021         ctxt_ap->bi = cpu_to_le32(vif->bss_conf.beacon_int);
1022         ctxt_ap->bi_reciprocal =
1023                 cpu_to_le32(iwl_mvm_reciprocal(vif->bss_conf.beacon_int));
1024         ctxt_ap->dtim_interval = cpu_to_le32(vif->bss_conf.beacon_int *
1025                                              vif->bss_conf.dtim_period);
1026         ctxt_ap->dtim_reciprocal =
1027                 cpu_to_le32(iwl_mvm_reciprocal(vif->bss_conf.beacon_int *
1028                                                vif->bss_conf.dtim_period));
1029
1030         ctxt_ap->mcast_qid = cpu_to_le32(vif->cab_queue);
1031
1032         /*
1033          * Only set the beacon time when the MAC is being added, when we
1034          * just modify the MAC then we should keep the time -- the firmware
1035          * can otherwise have a "jumping" TBTT.
1036          */
1037         if (add) {
1038                 /*
1039                  * If there is a station/P2P client interface which is
1040                  * associated, set the AP's TBTT far enough from the station's
1041                  * TBTT. Otherwise, set it to the current system time
1042                  */
1043                 ieee80211_iterate_active_interfaces_atomic(
1044                         mvm->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
1045                         iwl_mvm_mac_ap_iterator, &data);
1046
1047                 if (data.beacon_device_ts) {
1048                         u32 rand = (prandom_u32() % (64 - 36)) + 36;
1049                         mvmvif->ap_beacon_time = data.beacon_device_ts +
1050                                 ieee80211_tu_to_usec(data.beacon_int * rand /
1051                                                      100);
1052                 } else {
1053                         mvmvif->ap_beacon_time =
1054                                 iwl_read_prph(mvm->trans,
1055                                               DEVICE_SYSTEM_TIME_REG);
1056                 }
1057         }
1058
1059         ctxt_ap->beacon_time = cpu_to_le32(mvmvif->ap_beacon_time);
1060         ctxt_ap->beacon_tsf = 0; /* unused */
1061
1062         /* TODO: Assume that the beacon id == mac context id */
1063         ctxt_ap->beacon_template = cpu_to_le32(mvmvif->id);
1064 }
1065
1066 static int iwl_mvm_mac_ctxt_cmd_ap(struct iwl_mvm *mvm,
1067                                    struct ieee80211_vif *vif,
1068                                    u32 action)
1069 {
1070         struct iwl_mac_ctx_cmd cmd = {};
1071
1072         WARN_ON(vif->type != NL80211_IFTYPE_AP || vif->p2p);
1073
1074         /* Fill the common data for all mac context types */
1075         iwl_mvm_mac_ctxt_cmd_common(mvm, vif, &cmd, action);
1076
1077         /*
1078          * pass probe requests and beacons from other APs (needed
1079          * for ht protection)
1080          */
1081         cmd.filter_flags |= cpu_to_le32(MAC_FILTER_IN_PROBE_REQUEST |
1082                                         MAC_FILTER_IN_BEACON);
1083
1084         /* Fill the data specific for ap mode */
1085         iwl_mvm_mac_ctxt_cmd_fill_ap(mvm, vif, &cmd.ap,
1086                                      action == FW_CTXT_ACTION_ADD);
1087
1088         return iwl_mvm_mac_ctxt_send_cmd(mvm, &cmd);
1089 }
1090
1091 static int iwl_mvm_mac_ctxt_cmd_go(struct iwl_mvm *mvm,
1092                                    struct ieee80211_vif *vif,
1093                                    u32 action)
1094 {
1095         struct iwl_mac_ctx_cmd cmd = {};
1096         struct ieee80211_p2p_noa_attr *noa = &vif->bss_conf.p2p_noa_attr;
1097
1098         WARN_ON(vif->type != NL80211_IFTYPE_AP || !vif->p2p);
1099
1100         /* Fill the common data for all mac context types */
1101         iwl_mvm_mac_ctxt_cmd_common(mvm, vif, &cmd, action);
1102
1103         /*
1104          * pass probe requests and beacons from other APs (needed
1105          * for ht protection)
1106          */
1107         cmd.filter_flags |= cpu_to_le32(MAC_FILTER_IN_PROBE_REQUEST |
1108                                         MAC_FILTER_IN_BEACON);
1109
1110         /* Fill the data specific for GO mode */
1111         iwl_mvm_mac_ctxt_cmd_fill_ap(mvm, vif, &cmd.go.ap,
1112                                      action == FW_CTXT_ACTION_ADD);
1113
1114         cmd.go.ctwin = cpu_to_le32(noa->oppps_ctwindow &
1115                                         IEEE80211_P2P_OPPPS_CTWINDOW_MASK);
1116         cmd.go.opp_ps_enabled =
1117                         cpu_to_le32(!!(noa->oppps_ctwindow &
1118                                         IEEE80211_P2P_OPPPS_ENABLE_BIT));
1119
1120         return iwl_mvm_mac_ctxt_send_cmd(mvm, &cmd);
1121 }
1122
1123 static int iwl_mvm_mac_ctx_send(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1124                                 u32 action, bool force_assoc_off)
1125 {
1126         switch (vif->type) {
1127         case NL80211_IFTYPE_STATION:
1128                 return iwl_mvm_mac_ctxt_cmd_sta(mvm, vif, action,
1129                                                 force_assoc_off);
1130                 break;
1131         case NL80211_IFTYPE_AP:
1132                 if (!vif->p2p)
1133                         return iwl_mvm_mac_ctxt_cmd_ap(mvm, vif, action);
1134                 else
1135                         return iwl_mvm_mac_ctxt_cmd_go(mvm, vif, action);
1136                 break;
1137         case NL80211_IFTYPE_MONITOR:
1138                 return iwl_mvm_mac_ctxt_cmd_listener(mvm, vif, action);
1139         case NL80211_IFTYPE_P2P_DEVICE:
1140                 return iwl_mvm_mac_ctxt_cmd_p2p_device(mvm, vif, action);
1141         case NL80211_IFTYPE_ADHOC:
1142                 return iwl_mvm_mac_ctxt_cmd_ibss(mvm, vif, action);
1143         default:
1144                 break;
1145         }
1146
1147         return -EOPNOTSUPP;
1148 }
1149
1150 int iwl_mvm_mac_ctxt_add(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
1151 {
1152         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
1153         int ret;
1154
1155         if (WARN_ONCE(mvmvif->uploaded, "Adding active MAC %pM/%d\n",
1156                       vif->addr, ieee80211_vif_type_p2p(vif)))
1157                 return -EIO;
1158
1159         ret = iwl_mvm_mac_ctx_send(mvm, vif, FW_CTXT_ACTION_ADD,
1160                                    true);
1161         if (ret)
1162                 return ret;
1163
1164         /* will only do anything at resume from D3 time */
1165         iwl_mvm_set_last_nonqos_seq(mvm, vif);
1166
1167         mvmvif->uploaded = true;
1168         return 0;
1169 }
1170
1171 int iwl_mvm_mac_ctxt_changed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1172                              bool force_assoc_off)
1173 {
1174         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
1175
1176         if (WARN_ONCE(!mvmvif->uploaded, "Changing inactive MAC %pM/%d\n",
1177                       vif->addr, ieee80211_vif_type_p2p(vif)))
1178                 return -EIO;
1179
1180         return iwl_mvm_mac_ctx_send(mvm, vif, FW_CTXT_ACTION_MODIFY,
1181                                     force_assoc_off);
1182 }
1183
1184 int iwl_mvm_mac_ctxt_remove(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
1185 {
1186         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
1187         struct iwl_mac_ctx_cmd cmd;
1188         int ret;
1189
1190         if (WARN_ONCE(!mvmvif->uploaded, "Removing inactive MAC %pM/%d\n",
1191                       vif->addr, ieee80211_vif_type_p2p(vif)))
1192                 return -EIO;
1193
1194         memset(&cmd, 0, sizeof(cmd));
1195
1196         cmd.id_and_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id,
1197                                                            mvmvif->color));
1198         cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE);
1199
1200         ret = iwl_mvm_send_cmd_pdu(mvm, MAC_CONTEXT_CMD, 0,
1201                                    sizeof(cmd), &cmd);
1202         if (ret) {
1203                 IWL_ERR(mvm, "Failed to remove MAC context: %d\n", ret);
1204                 return ret;
1205         }
1206
1207         mvmvif->uploaded = false;
1208
1209         if (vif->type == NL80211_IFTYPE_MONITOR)
1210                 mvm->hw->flags &= ~IEEE80211_HW_RX_INCLUDES_FCS;
1211
1212         return 0;
1213 }
1214
1215 static void iwl_mvm_csa_count_down(struct iwl_mvm *mvm,
1216                                    struct ieee80211_vif *csa_vif, u32 gp2)
1217 {
1218         struct iwl_mvm_vif *mvmvif =
1219                         iwl_mvm_vif_from_mac80211(csa_vif);
1220
1221         if (!ieee80211_csa_is_complete(csa_vif)) {
1222                 int c = ieee80211_csa_update_counter(csa_vif);
1223
1224                 iwl_mvm_mac_ctxt_beacon_changed(mvm, csa_vif);
1225                 if (csa_vif->p2p &&
1226                     !iwl_mvm_te_scheduled(&mvmvif->time_event_data) && gp2) {
1227                         u32 rel_time = (c + 1) *
1228                                        csa_vif->bss_conf.beacon_int -
1229                                        IWL_MVM_CHANNEL_SWITCH_TIME;
1230                         u32 apply_time = gp2 + rel_time * 1024;
1231
1232                         iwl_mvm_schedule_csa_noa(mvm, csa_vif,
1233                                                  IWL_MVM_CHANNEL_SWITCH_TIME -
1234                                                  IWL_MVM_CHANNEL_SWITCH_MARGIN,
1235                                                  apply_time);
1236                 }
1237         } else if (!iwl_mvm_te_scheduled(&mvmvif->time_event_data)) {
1238                 /* we don't have CSA NoA scheduled yet, switch now */
1239                 ieee80211_csa_finish(csa_vif);
1240                 RCU_INIT_POINTER(mvm->csa_vif, NULL);
1241         }
1242 }
1243
1244 int iwl_mvm_rx_beacon_notif(struct iwl_mvm *mvm,
1245                             struct iwl_rx_cmd_buffer *rxb,
1246                             struct iwl_device_cmd *cmd)
1247 {
1248         struct iwl_rx_packet *pkt = rxb_addr(rxb);
1249         struct iwl_mvm_tx_resp *beacon_notify_hdr;
1250         struct ieee80211_vif *csa_vif;
1251         struct ieee80211_vif *tx_blocked_vif;
1252         u64 tsf;
1253
1254         lockdep_assert_held(&mvm->mutex);
1255
1256         if (mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_CAPA_EXTENDED_BEACON) {
1257                 struct iwl_extended_beacon_notif *beacon = (void *)pkt->data;
1258
1259                 beacon_notify_hdr = &beacon->beacon_notify_hdr;
1260                 tsf = le64_to_cpu(beacon->tsf);
1261                 mvm->ap_last_beacon_gp2 = le32_to_cpu(beacon->gp2);
1262         } else {
1263                 struct iwl_beacon_notif *beacon = (void *)pkt->data;
1264
1265                 beacon_notify_hdr = &beacon->beacon_notify_hdr;
1266                 tsf = le64_to_cpu(beacon->tsf);
1267         }
1268
1269         IWL_DEBUG_RX(mvm,
1270                      "beacon status %#x retries:%d tsf:0x%16llX gp2:0x%X rate:%d\n",
1271                      le16_to_cpu(beacon_notify_hdr->status.status) &
1272                                                                 TX_STATUS_MSK,
1273                      beacon_notify_hdr->failure_frame, tsf,
1274                      mvm->ap_last_beacon_gp2,
1275                      le32_to_cpu(beacon_notify_hdr->initial_rate));
1276
1277         csa_vif = rcu_dereference_protected(mvm->csa_vif,
1278                                             lockdep_is_held(&mvm->mutex));
1279         if (unlikely(csa_vif && csa_vif->csa_active))
1280                 iwl_mvm_csa_count_down(mvm, csa_vif, mvm->ap_last_beacon_gp2);
1281
1282         tx_blocked_vif = rcu_dereference_protected(mvm->csa_tx_blocked_vif,
1283                                                 lockdep_is_held(&mvm->mutex));
1284         if (unlikely(tx_blocked_vif)) {
1285                 struct iwl_mvm_vif *mvmvif =
1286                         iwl_mvm_vif_from_mac80211(tx_blocked_vif);
1287
1288                 /*
1289                  * The channel switch is started and we have blocked the
1290                  * stations. If this is the first beacon (the timeout wasn't
1291                  * set), set the unblock timeout, otherwise countdown
1292                  */
1293                 if (!mvm->csa_tx_block_bcn_timeout)
1294                         mvm->csa_tx_block_bcn_timeout =
1295                                 IWL_MVM_CS_UNBLOCK_TX_TIMEOUT;
1296                 else
1297                         mvm->csa_tx_block_bcn_timeout--;
1298
1299                 /* Check if the timeout is expired, and unblock tx */
1300                 if (mvm->csa_tx_block_bcn_timeout == 0) {
1301                         iwl_mvm_modify_all_sta_disable_tx(mvm, mvmvif, false);
1302                         RCU_INIT_POINTER(mvm->csa_tx_blocked_vif, NULL);
1303                 }
1304         }
1305
1306         return 0;
1307 }
1308
1309 static void iwl_mvm_beacon_loss_iterator(void *_data, u8 *mac,
1310                                          struct ieee80211_vif *vif)
1311 {
1312         struct iwl_missed_beacons_notif *missed_beacons = _data;
1313         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
1314
1315         if (mvmvif->id != (u16)le32_to_cpu(missed_beacons->mac_id))
1316                 return;
1317
1318         /*
1319          * TODO: the threshold should be adjusted based on latency conditions,
1320          * and/or in case of a CS flow on one of the other AP vifs.
1321          */
1322         if (le32_to_cpu(missed_beacons->consec_missed_beacons_since_last_rx) >
1323              IWL_MVM_MISSED_BEACONS_THRESHOLD)
1324                 ieee80211_beacon_loss(vif);
1325 }
1326
1327 int iwl_mvm_rx_missed_beacons_notif(struct iwl_mvm *mvm,
1328                                     struct iwl_rx_cmd_buffer *rxb,
1329                                     struct iwl_device_cmd *cmd)
1330 {
1331         struct iwl_rx_packet *pkt = rxb_addr(rxb);
1332         struct iwl_missed_beacons_notif *mb = (void *)pkt->data;
1333
1334         IWL_DEBUG_INFO(mvm,
1335                        "missed bcn mac_id=%u, consecutive=%u (%u, %u, %u)\n",
1336                        le32_to_cpu(mb->mac_id),
1337                        le32_to_cpu(mb->consec_missed_beacons),
1338                        le32_to_cpu(mb->consec_missed_beacons_since_last_rx),
1339                        le32_to_cpu(mb->num_recvd_beacons),
1340                        le32_to_cpu(mb->num_expected_beacons));
1341
1342         ieee80211_iterate_active_interfaces_atomic(mvm->hw,
1343                                                    IEEE80211_IFACE_ITER_NORMAL,
1344                                                    iwl_mvm_beacon_loss_iterator,
1345                                                    mb);
1346         return 0;
1347 }