drivers/net/wireless/intel/iwlwifi/mvm/time-event.c

   1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
   2 /*
   3  * Copyright (C) 2012-2014, 2018-2021 Intel Corporation
   4  * Copyright (C) 2013-2015 Intel Mobile Communications GmbH
   5  * Copyright (C) 2017 Intel Deutschland GmbH
   6  */
   7 #include <linux/jiffies.h>
   8 #include <net/mac80211.h>
   9
  10 #include "fw/notif-wait.h"
  11 #include "iwl-trans.h"
  12 #include "fw-api.h"
  13 #include "time-event.h"
  14 #include "mvm.h"
  15 #include "iwl-io.h"
  16 #include "iwl-prph.h"
  17
  18 /*
  19  * For the high priority TE use a time event type that has similar priority to
  20  * the FW's action scan priority.
  21  */
  22 #define IWL_MVM_ROC_TE_TYPE_NORMAL TE_P2P_DEVICE_DISCOVERABLE
  23 #define IWL_MVM_ROC_TE_TYPE_MGMT_TX TE_P2P_CLIENT_ASSOC
  24
  25 void iwl_mvm_te_clear_data(struct iwl_mvm *mvm,
  26                            struct iwl_mvm_time_event_data *te_data)
  27 {
  28         lockdep_assert_held(&mvm->time_event_lock);
  29
  30         if (!te_data || !te_data->vif)
  31                 return;
  32
  33         list_del(&te_data->list);
  34
  35         /*
  36          * the list is only used for AUX ROC events so make sure it is always
  37          * initialized
  38          */
  39         INIT_LIST_HEAD(&te_data->list);
  40
  41         te_data->running = false;
  42         te_data->uid = 0;
  43         te_data->id = TE_MAX;
  44         te_data->vif = NULL;
  45 }
  46
  47 void iwl_mvm_roc_done_wk(struct work_struct *wk)
  48 {
  49         struct iwl_mvm *mvm = container_of(wk, struct iwl_mvm, roc_done_wk);
  50
  51         /*
  52          * Clear the ROC_RUNNING /ROC_AUX_RUNNING status bit.
  53          * This will cause the TX path to drop offchannel transmissions.
  54          * That would also be done by mac80211, but it is racy, in particular
  55          * in the case that the time event actually completed in the firmware
  56          * (which is handled in iwl_mvm_te_handle_notif).
  57          */
  58         clear_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status);
  59         clear_bit(IWL_MVM_STATUS_ROC_AUX_RUNNING, &mvm->status);
  60
  61         synchronize_net();
  62
  63         /*
  64          * Flush the offchannel queue -- this is called when the time
  65          * event finishes or is canceled, so that frames queued for it
  66          * won't get stuck on the queue and be transmitted in the next
  67          * time event.
  68          */
  69
  70         mutex_lock(&mvm->mutex);
  71         if (test_and_clear_bit(IWL_MVM_STATUS_NEED_FLUSH_P2P, &mvm->status)) {
  72                 struct iwl_mvm_vif *mvmvif;
  73
  74                 /*
  75                  * NB: access to this pointer would be racy, but the flush bit
  76                  * can only be set when we had a P2P-Device VIF, and we have a
  77                  * flush of this work in iwl_mvm_prepare_mac_removal() so it's
  78                  * not really racy.
  79                  */
  80
  81                 if (!WARN_ON(!mvm->p2p_device_vif)) {
  82                         mvmvif = iwl_mvm_vif_from_mac80211(mvm->p2p_device_vif);
  83                         iwl_mvm_flush_sta(mvm, &mvmvif->bcast_sta, true);
  84                 }
  85         } else {
  86                 /* do the same in case of hot spot 2.0 */
  87                 iwl_mvm_flush_sta(mvm, &mvm->aux_sta, true);
  88                 /* In newer version of this command an aux station is added only
  89                  * in cases of dedicated tx queue and need to be removed in end
  90                  * of use */
  91                 if (iwl_fw_lookup_cmd_ver(mvm->fw, LONG_GROUP,
  92                                           ADD_STA, 0) >= 12)
  93                         iwl_mvm_rm_aux_sta(mvm);
  94         }
  95
  96         mutex_unlock(&mvm->mutex);
  97 }
  98
  99 static void iwl_mvm_roc_finished(struct iwl_mvm *mvm)
 100 {
 101         /*
 102          * Of course, our status bit is just as racy as mac80211, so in
 103          * addition, fire off the work struct which will drop all frames
 104          * from the hardware queues that made it through the race. First
 105          * it will of course synchronize the TX path to make sure that
 106          * any *new* TX will be rejected.
 107          */
 108         schedule_work(&mvm->roc_done_wk);
 109 }
 110
 111 static void iwl_mvm_csa_noa_start(struct iwl_mvm *mvm)
 112 {
 113         struct ieee80211_vif *csa_vif;
 114
 115         rcu_read_lock();
 116
 117         csa_vif = rcu_dereference(mvm->csa_vif);
 118         if (!csa_vif || !csa_vif->csa_active)
 119                 goto out_unlock;
 120
 121         IWL_DEBUG_TE(mvm, "CSA NOA started\n");
 122
 123         /*
 124          * CSA NoA is started but we still have beacons to
 125          * transmit on the current channel.
 126          * So we just do nothing here and the switch
 127          * will be performed on the last TBTT.
 128          */
 129         if (!ieee80211_beacon_cntdwn_is_complete(csa_vif)) {
 130                 IWL_WARN(mvm, "CSA NOA started too early\n");
 131                 goto out_unlock;
 132         }
 133
 134         ieee80211_csa_finish(csa_vif);
 135
 136         rcu_read_unlock();
 137
 138         RCU_INIT_POINTER(mvm->csa_vif, NULL);
 139
 140         return;
 141
 142 out_unlock:
 143         rcu_read_unlock();
 144 }
 145
 146 static bool iwl_mvm_te_check_disconnect(struct iwl_mvm *mvm,
 147                                         struct ieee80211_vif *vif,
 148                                         const char *errmsg)
 149 {
 150         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 151
 152         if (vif->type != NL80211_IFTYPE_STATION)
 153                 return false;
 154
 155         if (!mvmvif->csa_bcn_pending && vif->bss_conf.assoc &&
 156             vif->bss_conf.dtim_period)
 157                 return false;
 158         if (errmsg)
 159                 IWL_ERR(mvm, "%s\n", errmsg);
 160
 161         if (mvmvif->csa_bcn_pending) {
 162                 struct iwl_mvm_sta *mvmsta;
 163
 164                 rcu_read_lock();
 165                 mvmsta = iwl_mvm_sta_from_staid_rcu(mvm, mvmvif->ap_sta_id);
 166                 if (!WARN_ON(!mvmsta))
 167                         iwl_mvm_sta_modify_disable_tx(mvm, mvmsta, false);
 168                 rcu_read_unlock();
 169         }
 170
 171         if (vif->bss_conf.assoc) {
 172                 /*
 173                  * When not associated, this will be called from
 174                  * iwl_mvm_event_mlme_callback_ini()
 175                  */
 176                 iwl_dbg_tlv_time_point(&mvm->fwrt,
 177                                        IWL_FW_INI_TIME_POINT_ASSOC_FAILED,
 178                                        NULL);
 179         }
 180
 181         iwl_mvm_connection_loss(mvm, vif, errmsg);
 182         return true;
 183 }
 184
 185 static void
 186 iwl_mvm_te_handle_notify_csa(struct iwl_mvm *mvm,
 187                              struct iwl_mvm_time_event_data *te_data,
 188                              struct iwl_time_event_notif *notif)
 189 {
 190         struct ieee80211_vif *vif = te_data->vif;
 191         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 192
 193         if (!notif->status)
 194                 IWL_DEBUG_TE(mvm, "CSA time event failed to start\n");
 195
 196         switch (te_data->vif->type) {
 197         case NL80211_IFTYPE_AP:
 198                 if (!notif->status)
 199                         mvmvif->csa_failed = true;
 200                 iwl_mvm_csa_noa_start(mvm);
 201                 break;
 202         case NL80211_IFTYPE_STATION:
 203                 if (!notif->status) {
 204                         iwl_mvm_connection_loss(mvm, vif,
 205                                                 "CSA TE failed to start");
 206                         break;
 207                 }
 208                 iwl_mvm_csa_client_absent(mvm, te_data->vif);
 209                 cancel_delayed_work(&mvmvif->csa_work);
 210                 ieee80211_chswitch_done(te_data->vif, true);
 211                 break;
 212         default:
 213                 /* should never happen */
 214                 WARN_ON_ONCE(1);
 215                 break;
 216         }
 217
 218         /* we don't need it anymore */
 219         iwl_mvm_te_clear_data(mvm, te_data);
 220 }
 221
 222 static void iwl_mvm_te_check_trigger(struct iwl_mvm *mvm,
 223                                      struct iwl_time_event_notif *notif,
 224                                      struct iwl_mvm_time_event_data *te_data)
 225 {
 226         struct iwl_fw_dbg_trigger_tlv *trig;
 227         struct iwl_fw_dbg_trigger_time_event *te_trig;
 228         int i;
 229
 230         trig = iwl_fw_dbg_trigger_on(&mvm->fwrt,
 231                                      ieee80211_vif_to_wdev(te_data->vif),
 232                                      FW_DBG_TRIGGER_TIME_EVENT);
 233         if (!trig)
 234                 return;
 235
 236         te_trig = (void *)trig->data;
 237
 238         for (i = 0; i < ARRAY_SIZE(te_trig->time_events); i++) {
 239                 u32 trig_te_id = le32_to_cpu(te_trig->time_events[i].id);
 240                 u32 trig_action_bitmap =
 241                         le32_to_cpu(te_trig->time_events[i].action_bitmap);
 242                 u32 trig_status_bitmap =
 243                         le32_to_cpu(te_trig->time_events[i].status_bitmap);
 244
 245                 if (trig_te_id != te_data->id ||
 246                     !(trig_action_bitmap & le32_to_cpu(notif->action)) ||
 247                     !(trig_status_bitmap & BIT(le32_to_cpu(notif->status))))
 248                         continue;
 249
 250                 iwl_fw_dbg_collect_trig(&mvm->fwrt, trig,
 251                                         "Time event %d Action 0x%x received status: %d",
 252                                         te_data->id,
 253                                         le32_to_cpu(notif->action),
 254                                         le32_to_cpu(notif->status));
 255                 break;
 256         }
 257 }
 258
 259 static void iwl_mvm_p2p_roc_finished(struct iwl_mvm *mvm)
 260 {
 261         /*
 262          * If the IWL_MVM_STATUS_NEED_FLUSH_P2P is already set, then the
 263          * roc_done_wk is already scheduled or running, so don't schedule it
 264          * again to avoid a race where the roc_done_wk clears this bit after
 265          * it is set here, affecting the next run of the roc_done_wk.
 266          */
 267         if (!test_and_set_bit(IWL_MVM_STATUS_NEED_FLUSH_P2P, &mvm->status))
 268                 iwl_mvm_roc_finished(mvm);
 269 }
 270
 271 /*
 272  * Handles a FW notification for an event that is known to the driver.
 273  *
 274  * @mvm: the mvm component
 275  * @te_data: the time event data
 276  * @notif: the notification data corresponding the time event data.
 277  */
 278 static void iwl_mvm_te_handle_notif(struct iwl_mvm *mvm,
 279                                     struct iwl_mvm_time_event_data *te_data,
 280                                     struct iwl_time_event_notif *notif)
 281 {
 282         lockdep_assert_held(&mvm->time_event_lock);
 283
 284         IWL_DEBUG_TE(mvm, "Handle time event notif - UID = 0x%x action %d\n",
 285                      le32_to_cpu(notif->unique_id),
 286                      le32_to_cpu(notif->action));
 287
 288         iwl_mvm_te_check_trigger(mvm, notif, te_data);
 289
 290         /*
 291          * The FW sends the start/end time event notifications even for events
 292          * that it fails to schedule. This is indicated in the status field of
 293          * the notification. This happens in cases that the scheduler cannot
 294          * find a schedule that can handle the event (for example requesting a
 295          * P2P Device discoveribility, while there are other higher priority
 296          * events in the system).
 297          */
 298         if (!le32_to_cpu(notif->status)) {
 299                 const char *msg;
 300
 301                 if (notif->action & cpu_to_le32(TE_V2_NOTIF_HOST_EVENT_START))
 302                         msg = "Time Event start notification failure";
 303                 else
 304                         msg = "Time Event end notification failure";
 305
 306                 IWL_DEBUG_TE(mvm, "%s\n", msg);
 307
 308                 if (iwl_mvm_te_check_disconnect(mvm, te_data->vif, msg)) {
 309                         iwl_mvm_te_clear_data(mvm, te_data);
 310                         return;
 311                 }
 312         }
 313
 314         if (le32_to_cpu(notif->action) & TE_V2_NOTIF_HOST_EVENT_END) {
 315                 IWL_DEBUG_TE(mvm,
 316                              "TE ended - current time %lu, estimated end %lu\n",
 317                              jiffies, te_data->end_jiffies);
 318
 319                 switch (te_data->vif->type) {
 320                 case NL80211_IFTYPE_P2P_DEVICE:
 321                         ieee80211_remain_on_channel_expired(mvm->hw);
 322                         iwl_mvm_p2p_roc_finished(mvm);
 323                         break;
 324                 case NL80211_IFTYPE_STATION:
 325                         /*
 326                          * If we are switching channel, don't disconnect
 327                          * if the time event is already done. Beacons can
 328                          * be delayed a bit after the switch.
 329                          */
 330                         if (te_data->id == TE_CHANNEL_SWITCH_PERIOD) {
 331                                 IWL_DEBUG_TE(mvm,
 332                                              "No beacon heard and the CS time event is over, don't disconnect\n");
 333                                 break;
 334                         }
 335
 336                         /*
 337                          * By now, we should have finished association
 338                          * and know the dtim period.
 339                          */
 340                         iwl_mvm_te_check_disconnect(mvm, te_data->vif,
 341                                 !te_data->vif->bss_conf.assoc ?
 342                                 "Not associated and the time event is over already..." :
 343                                 "No beacon heard and the time event is over already...");
 344                         break;
 345                 default:
 346                         break;
 347                 }
 348
 349                 iwl_mvm_te_clear_data(mvm, te_data);
 350         } else if (le32_to_cpu(notif->action) & TE_V2_NOTIF_HOST_EVENT_START) {
 351                 te_data->running = true;
 352                 te_data->end_jiffies = TU_TO_EXP_TIME(te_data->duration);
 353
 354                 if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) {
 355                         set_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status);
 356                         ieee80211_ready_on_channel(mvm->hw);
 357                 } else if (te_data->id == TE_CHANNEL_SWITCH_PERIOD) {
 358                         iwl_mvm_te_handle_notify_csa(mvm, te_data, notif);
 359                 }
 360         } else {
 361                 IWL_WARN(mvm, "Got TE with unknown action\n");
 362         }
 363 }
 364
 365 /*
 366  * Handle A Aux ROC time event
 367  */
 368 static int iwl_mvm_aux_roc_te_handle_notif(struct iwl_mvm *mvm,
 369                                            struct iwl_time_event_notif *notif)
 370 {
 371         struct iwl_mvm_time_event_data *te_data, *tmp;
 372         bool aux_roc_te = false;
 373
 374         list_for_each_entry_safe(te_data, tmp, &mvm->aux_roc_te_list, list) {
 375                 if (le32_to_cpu(notif->unique_id) == te_data->uid) {
 376                         aux_roc_te = true;
 377                         break;
 378                 }
 379         }
 380         if (!aux_roc_te) /* Not a Aux ROC time event */
 381                 return -EINVAL;
 382
 383         iwl_mvm_te_check_trigger(mvm, notif, te_data);
 384
 385         IWL_DEBUG_TE(mvm,
 386                      "Aux ROC time event notification  - UID = 0x%x action %d (error = %d)\n",
 387                      le32_to_cpu(notif->unique_id),
 388                      le32_to_cpu(notif->action), le32_to_cpu(notif->status));
 389
 390         if (!le32_to_cpu(notif->status) ||
 391             le32_to_cpu(notif->action) == TE_V2_NOTIF_HOST_EVENT_END) {
 392                 /* End TE, notify mac80211 */
 393                 ieee80211_remain_on_channel_expired(mvm->hw);
 394                 iwl_mvm_roc_finished(mvm); /* flush aux queue */
 395                 list_del(&te_data->list); /* remove from list */
 396                 te_data->running = false;
 397                 te_data->vif = NULL;
 398                 te_data->uid = 0;
 399                 te_data->id = TE_MAX;
 400         } else if (le32_to_cpu(notif->action) == TE_V2_NOTIF_HOST_EVENT_START) {
 401                 set_bit(IWL_MVM_STATUS_ROC_AUX_RUNNING, &mvm->status);
 402                 te_data->running = true;
 403                 ieee80211_ready_on_channel(mvm->hw); /* Start TE */
 404         } else {
 405                 IWL_DEBUG_TE(mvm,
 406                              "ERROR: Unknown Aux ROC Time Event (action = %d)\n",
 407                              le32_to_cpu(notif->action));
 408                 return -EINVAL;
 409         }
 410
 411         return 0;
 412 }
 413
 414 /*
 415  * The Rx handler for time event notifications
 416  */
 417 void iwl_mvm_rx_time_event_notif(struct iwl_mvm *mvm,
 418                                  struct iwl_rx_cmd_buffer *rxb)
 419 {
 420         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 421         struct iwl_time_event_notif *notif = (void *)pkt->data;
 422         struct iwl_mvm_time_event_data *te_data, *tmp;
 423
 424         IWL_DEBUG_TE(mvm, "Time event notification - UID = 0x%x action %d\n",
 425                      le32_to_cpu(notif->unique_id),
 426                      le32_to_cpu(notif->action));
 427
 428         spin_lock_bh(&mvm->time_event_lock);
 429         /* This time event is triggered for Aux ROC request */
 430         if (!iwl_mvm_aux_roc_te_handle_notif(mvm, notif))
 431                 goto unlock;
 432
 433         list_for_each_entry_safe(te_data, tmp, &mvm->time_event_list, list) {
 434                 if (le32_to_cpu(notif->unique_id) == te_data->uid)
 435                         iwl_mvm_te_handle_notif(mvm, te_data, notif);
 436         }
 437 unlock:
 438         spin_unlock_bh(&mvm->time_event_lock);
 439 }
 440
 441 static bool iwl_mvm_te_notif(struct iwl_notif_wait_data *notif_wait,
 442                              struct iwl_rx_packet *pkt, void *data)
 443 {
 444         struct iwl_mvm *mvm =
 445                 container_of(notif_wait, struct iwl_mvm, notif_wait);
 446         struct iwl_mvm_time_event_data *te_data = data;
 447         struct iwl_time_event_notif *resp;
 448         int resp_len = iwl_rx_packet_payload_len(pkt);
 449
 450         if (WARN_ON(pkt->hdr.cmd != TIME_EVENT_NOTIFICATION))
 451                 return true;
 452
 453         if (WARN_ON_ONCE(resp_len != sizeof(*resp))) {
 454                 IWL_ERR(mvm, "Invalid TIME_EVENT_NOTIFICATION response\n");
 455                 return true;
 456         }
 457
 458         resp = (void *)pkt->data;
 459
 460         /* te_data->uid is already set in the TIME_EVENT_CMD response */
 461         if (le32_to_cpu(resp->unique_id) != te_data->uid)
 462                 return false;
 463
 464         IWL_DEBUG_TE(mvm, "TIME_EVENT_NOTIFICATION response - UID = 0x%x\n",
 465                      te_data->uid);
 466         if (!resp->status)
 467                 IWL_ERR(mvm,
 468                         "TIME_EVENT_NOTIFICATION received but not executed\n");
 469
 470         return true;
 471 }
 472
 473 static bool iwl_mvm_time_event_response(struct iwl_notif_wait_data *notif_wait,
 474                                         struct iwl_rx_packet *pkt, void *data)
 475 {
 476         struct iwl_mvm *mvm =
 477                 container_of(notif_wait, struct iwl_mvm, notif_wait);
 478         struct iwl_mvm_time_event_data *te_data = data;
 479         struct iwl_time_event_resp *resp;
 480         int resp_len = iwl_rx_packet_payload_len(pkt);
 481
 482         if (WARN_ON(pkt->hdr.cmd != TIME_EVENT_CMD))
 483                 return true;
 484
 485         if (WARN_ON_ONCE(resp_len != sizeof(*resp))) {
 486                 IWL_ERR(mvm, "Invalid TIME_EVENT_CMD response\n");
 487                 return true;
 488         }
 489
 490         resp = (void *)pkt->data;
 491
 492         /* we should never get a response to another TIME_EVENT_CMD here */
 493         if (WARN_ON_ONCE(le32_to_cpu(resp->id) != te_data->id))
 494                 return false;
 495
 496         te_data->uid = le32_to_cpu(resp->unique_id);
 497         IWL_DEBUG_TE(mvm, "TIME_EVENT_CMD response - UID = 0x%x\n",
 498                      te_data->uid);
 499         return true;
 500 }
 501
 502 static int iwl_mvm_time_event_send_add(struct iwl_mvm *mvm,
 503                                        struct ieee80211_vif *vif,
 504                                        struct iwl_mvm_time_event_data *te_data,
 505                                        struct iwl_time_event_cmd *te_cmd)
 506 {
 507         static const u16 time_event_response[] = { TIME_EVENT_CMD };
 508         struct iwl_notification_wait wait_time_event;
 509         int ret;
 510
 511         lockdep_assert_held(&mvm->mutex);
 512
 513         IWL_DEBUG_TE(mvm, "Add new TE, duration %d TU\n",
 514                      le32_to_cpu(te_cmd->duration));
 515
 516         spin_lock_bh(&mvm->time_event_lock);
 517         if (WARN_ON(te_data->id != TE_MAX)) {
 518                 spin_unlock_bh(&mvm->time_event_lock);
 519                 return -EIO;
 520         }
 521         te_data->vif = vif;
 522         te_data->duration = le32_to_cpu(te_cmd->duration);
 523         te_data->id = le32_to_cpu(te_cmd->id);
 524         list_add_tail(&te_data->list, &mvm->time_event_list);
 525         spin_unlock_bh(&mvm->time_event_lock);
 526
 527         /*
 528          * Use a notification wait, which really just processes the
 529          * command response and doesn't wait for anything, in order
 530          * to be able to process the response and get the UID inside
 531          * the RX path. Using CMD_WANT_SKB doesn't work because it
 532          * stores the buffer and then wakes up this thread, by which
 533          * time another notification (that the time event started)
 534          * might already be processed unsuccessfully.
 535          */
 536         iwl_init_notification_wait(&mvm->notif_wait, &wait_time_event,
 537                                    time_event_response,
 538                                    ARRAY_SIZE(time_event_response),
 539                                    iwl_mvm_time_event_response, te_data);
 540
 541         ret = iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, 0,
 542                                             sizeof(*te_cmd), te_cmd);
 543         if (ret) {
 544                 IWL_ERR(mvm, "Couldn't send TIME_EVENT_CMD: %d\n", ret);
 545                 iwl_remove_notification(&mvm->notif_wait, &wait_time_event);
 546                 goto out_clear_te;
 547         }
 548
 549         /* No need to wait for anything, so just pass 1 (0 isn't valid) */
 550         ret = iwl_wait_notification(&mvm->notif_wait, &wait_time_event, 1);
 551         /* should never fail */
 552         WARN_ON_ONCE(ret);
 553
 554         if (ret) {
 555  out_clear_te:
 556                 spin_lock_bh(&mvm->time_event_lock);
 557                 iwl_mvm_te_clear_data(mvm, te_data);
 558                 spin_unlock_bh(&mvm->time_event_lock);
 559         }
 560         return ret;
 561 }
 562
 563 void iwl_mvm_protect_session(struct iwl_mvm *mvm,
 564                              struct ieee80211_vif *vif,
 565                              u32 duration, u32 min_duration,
 566                              u32 max_delay, bool wait_for_notif)
 567 {
 568         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 569         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 570         const u16 te_notif_response[] = { TIME_EVENT_NOTIFICATION };
 571         struct iwl_notification_wait wait_te_notif;
 572         struct iwl_time_event_cmd time_cmd = {};
 573
 574         lockdep_assert_held(&mvm->mutex);
 575
 576         if (te_data->running &&
 577             time_after(te_data->end_jiffies, TU_TO_EXP_TIME(min_duration))) {
 578                 IWL_DEBUG_TE(mvm, "We have enough time in the current TE: %u\n",
 579                              jiffies_to_msecs(te_data->end_jiffies - jiffies));
 580                 return;
 581         }
 582
 583         if (te_data->running) {
 584                 IWL_DEBUG_TE(mvm, "extend 0x%x: only %u ms left\n",
 585                              te_data->uid,
 586                              jiffies_to_msecs(te_data->end_jiffies - jiffies));
 587                 /*
 588                  * we don't have enough time
 589                  * cancel the current TE and issue a new one
 590                  * Of course it would be better to remove the old one only
 591                  * when the new one is added, but we don't care if we are off
 592                  * channel for a bit. All we need to do, is not to return
 593                  * before we actually begin to be on the channel.
 594                  */
 595                 iwl_mvm_stop_session_protection(mvm, vif);
 596         }
 597
 598         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
 599         time_cmd.id_and_color =
 600                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 601         time_cmd.id = cpu_to_le32(TE_BSS_STA_AGGRESSIVE_ASSOC);
 602
 603         time_cmd.apply_time = cpu_to_le32(0);
 604
 605         time_cmd.max_frags = TE_V2_FRAG_NONE;
 606         time_cmd.max_delay = cpu_to_le32(max_delay);
 607         /* TODO: why do we need to interval = bi if it is not periodic? */
 608         time_cmd.interval = cpu_to_le32(1);
 609         time_cmd.duration = cpu_to_le32(duration);
 610         time_cmd.repeat = 1;
 611         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
 612                                       TE_V2_NOTIF_HOST_EVENT_END |
 613                                       TE_V2_START_IMMEDIATELY);
 614
 615         if (!wait_for_notif) {
 616                 iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
 617                 return;
 618         }
 619
 620         /*
 621          * Create notification_wait for the TIME_EVENT_NOTIFICATION to use
 622          * right after we send the time event
 623          */
 624         iwl_init_notification_wait(&mvm->notif_wait, &wait_te_notif,
 625                                    te_notif_response,
 626                                    ARRAY_SIZE(te_notif_response),
 627                                    iwl_mvm_te_notif, te_data);
 628
 629         /* If TE was sent OK - wait for the notification that started */
 630         if (iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd)) {
 631                 IWL_ERR(mvm, "Failed to add TE to protect session\n");
 632                 iwl_remove_notification(&mvm->notif_wait, &wait_te_notif);
 633         } else if (iwl_wait_notification(&mvm->notif_wait, &wait_te_notif,
 634                                          TU_TO_JIFFIES(max_delay))) {
 635                 IWL_ERR(mvm, "Failed to protect session until TE\n");
 636         }
 637 }
 638
 639 static void iwl_mvm_cancel_session_protection(struct iwl_mvm *mvm,
 640                                               struct iwl_mvm_vif *mvmvif,
 641                                               u32 id)
 642 {
 643         struct iwl_mvm_session_prot_cmd cmd = {
 644                 .id_and_color =
 645                         cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id,
 646                                                         mvmvif->color)),
 647                 .action = cpu_to_le32(FW_CTXT_ACTION_REMOVE),
 648                 .conf_id = cpu_to_le32(id),
 649         };
 650         int ret;
 651
 652         ret = iwl_mvm_send_cmd_pdu(mvm, iwl_cmd_id(SESSION_PROTECTION_CMD,
 653                                                    MAC_CONF_GROUP, 0),
 654                                    0, sizeof(cmd), &cmd);
 655         if (ret)
 656                 IWL_ERR(mvm,
 657                         "Couldn't send the SESSION_PROTECTION_CMD: %d\n", ret);
 658 }
 659
 660 static bool __iwl_mvm_remove_time_event(struct iwl_mvm *mvm,
 661                                         struct iwl_mvm_time_event_data *te_data,
 662                                         u32 *uid)
 663 {
 664         u32 id;
 665         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(te_data->vif);
 666         enum nl80211_iftype iftype;
 667
 668         if (!te_data->vif)
 669                 return false;
 670
 671         iftype = te_data->vif->type;
 672
 673         /*
 674          * It is possible that by the time we got to this point the time
 675          * event was already removed.
 676          */
 677         spin_lock_bh(&mvm->time_event_lock);
 678
 679         /* Save time event uid before clearing its data */
 680         *uid = te_data->uid;
 681         id = te_data->id;
 682
 683         /*
 684          * The clear_data function handles time events that were already removed
 685          */
 686         iwl_mvm_te_clear_data(mvm, te_data);
 687         spin_unlock_bh(&mvm->time_event_lock);
 688
 689         /* When session protection is supported, the te_data->id field
 690          * is reused to save session protection's configuration.
 691          */
 692         if (fw_has_capa(&mvm->fw->ucode_capa,
 693                         IWL_UCODE_TLV_CAPA_SESSION_PROT_CMD)) {
 694                 if (mvmvif && id < SESSION_PROTECT_CONF_MAX_ID) {
 695                         /* Session protection is still ongoing. Cancel it */
 696                         iwl_mvm_cancel_session_protection(mvm, mvmvif, id);
 697                         if (iftype == NL80211_IFTYPE_P2P_DEVICE) {
 698                                 iwl_mvm_p2p_roc_finished(mvm);
 699                         }
 700                 }
 701                 return false;
 702         } else {
 703                 /* It is possible that by the time we try to remove it, the
 704                  * time event has already ended and removed. In such a case
 705                  * there is no need to send a removal command.
 706                  */
 707                 if (id == TE_MAX) {
 708                         IWL_DEBUG_TE(mvm, "TE 0x%x has already ended\n", *uid);
 709                         return false;
 710                 }
 711         }
 712
 713         return true;
 714 }
 715
 716 /*
 717  * Explicit request to remove a aux roc time event. The removal of a time
 718  * event needs to be synchronized with the flow of a time event's end
 719  * notification, which also removes the time event from the op mode
 720  * data structures.
 721  */
 722 static void iwl_mvm_remove_aux_roc_te(struct iwl_mvm *mvm,
 723                                       struct iwl_mvm_vif *mvmvif,
 724                                       struct iwl_mvm_time_event_data *te_data)
 725 {
 726         struct iwl_hs20_roc_req aux_cmd = {};
 727         u16 len = sizeof(aux_cmd) - iwl_mvm_chan_info_padding(mvm);
 728
 729         u32 uid;
 730         int ret;
 731
 732         if (!__iwl_mvm_remove_time_event(mvm, te_data, &uid))
 733                 return;
 734
 735         aux_cmd.event_unique_id = cpu_to_le32(uid);
 736         aux_cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE);
 737         aux_cmd.id_and_color =
 738                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 739         IWL_DEBUG_TE(mvm, "Removing BSS AUX ROC TE 0x%x\n",
 740                      le32_to_cpu(aux_cmd.event_unique_id));
 741         ret = iwl_mvm_send_cmd_pdu(mvm, HOT_SPOT_CMD, 0,
 742                                    len, &aux_cmd);
 743
 744         if (WARN_ON(ret))
 745                 return;
 746 }
 747
 748 /*
 749  * Explicit request to remove a time event. The removal of a time event needs to
 750  * be synchronized with the flow of a time event's end notification, which also
 751  * removes the time event from the op mode data structures.
 752  */
 753 void iwl_mvm_remove_time_event(struct iwl_mvm *mvm,
 754                                struct iwl_mvm_vif *mvmvif,
 755                                struct iwl_mvm_time_event_data *te_data)
 756 {
 757         struct iwl_time_event_cmd time_cmd = {};
 758         u32 uid;
 759         int ret;
 760
 761         if (!__iwl_mvm_remove_time_event(mvm, te_data, &uid))
 762                 return;
 763
 764         /* When we remove a TE, the UID is to be set in the id field */
 765         time_cmd.id = cpu_to_le32(uid);
 766         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE);
 767         time_cmd.id_and_color =
 768                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 769
 770         IWL_DEBUG_TE(mvm, "Removing TE 0x%x\n", le32_to_cpu(time_cmd.id));
 771         ret = iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, 0,
 772                                    sizeof(time_cmd), &time_cmd);
 773         if (ret)
 774                 IWL_ERR(mvm, "Couldn't remove the time event\n");
 775 }
 776
 777 void iwl_mvm_stop_session_protection(struct iwl_mvm *mvm,
 778                                      struct ieee80211_vif *vif)
 779 {
 780         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 781         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 782         u32 id;
 783
 784         lockdep_assert_held(&mvm->mutex);
 785
 786         spin_lock_bh(&mvm->time_event_lock);
 787         id = te_data->id;
 788         spin_unlock_bh(&mvm->time_event_lock);
 789
 790         if (fw_has_capa(&mvm->fw->ucode_capa,
 791                         IWL_UCODE_TLV_CAPA_SESSION_PROT_CMD)) {
 792                 if (id != SESSION_PROTECT_CONF_ASSOC) {
 793                         IWL_DEBUG_TE(mvm,
 794                                      "don't remove session protection id=%u\n",
 795                                      id);
 796                         return;
 797                 }
 798         } else if (id != TE_BSS_STA_AGGRESSIVE_ASSOC) {
 799                 IWL_DEBUG_TE(mvm,
 800                              "don't remove TE with id=%u (not session protection)\n",
 801                              id);
 802                 return;
 803         }
 804
 805         iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
 806 }
 807
 808 void iwl_mvm_rx_session_protect_notif(struct iwl_mvm *mvm,
 809                                       struct iwl_rx_cmd_buffer *rxb)
 810 {
 811         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 812         struct iwl_mvm_session_prot_notif *notif = (void *)pkt->data;
 813         struct ieee80211_vif *vif;
 814         struct iwl_mvm_vif *mvmvif;
 815
 816         rcu_read_lock();
 817         vif = iwl_mvm_rcu_dereference_vif_id(mvm, le32_to_cpu(notif->mac_id),
 818                                              true);
 819
 820         if (!vif)
 821                 goto out_unlock;
 822
 823         mvmvif = iwl_mvm_vif_from_mac80211(vif);
 824
 825         /* The vif is not a P2P_DEVICE, maintain its time_event_data */
 826         if (vif->type != NL80211_IFTYPE_P2P_DEVICE) {
 827                 struct iwl_mvm_time_event_data *te_data =
 828                         &mvmvif->time_event_data;
 829
 830                 if (!le32_to_cpu(notif->status)) {
 831                         iwl_mvm_te_check_disconnect(mvm, vif,
 832                                                     "Session protection failure");
 833                         spin_lock_bh(&mvm->time_event_lock);
 834                         iwl_mvm_te_clear_data(mvm, te_data);
 835                         spin_unlock_bh(&mvm->time_event_lock);
 836                 }
 837
 838                 if (le32_to_cpu(notif->start)) {
 839                         spin_lock_bh(&mvm->time_event_lock);
 840                         te_data->running = le32_to_cpu(notif->start);
 841                         te_data->end_jiffies =
 842                                 TU_TO_EXP_TIME(te_data->duration);
 843                         spin_unlock_bh(&mvm->time_event_lock);
 844                 } else {
 845                         /*
 846                          * By now, we should have finished association
 847                          * and know the dtim period.
 848                          */
 849                         iwl_mvm_te_check_disconnect(mvm, vif,
 850                                                     !vif->bss_conf.assoc ?
 851                                                     "Not associated and the session protection is over already..." :
 852                                                     "No beacon heard and the session protection is over already...");
 853                         spin_lock_bh(&mvm->time_event_lock);
 854                         iwl_mvm_te_clear_data(mvm, te_data);
 855                         spin_unlock_bh(&mvm->time_event_lock);
 856                 }
 857
 858                 goto out_unlock;
 859         }
 860
 861         if (!le32_to_cpu(notif->status) || !le32_to_cpu(notif->start)) {
 862                 /* End TE, notify mac80211 */
 863                 mvmvif->time_event_data.id = SESSION_PROTECT_CONF_MAX_ID;
 864                 ieee80211_remain_on_channel_expired(mvm->hw);
 865                 iwl_mvm_p2p_roc_finished(mvm);
 866         } else if (le32_to_cpu(notif->start)) {
 867                 if (WARN_ON(mvmvif->time_event_data.id !=
 868                                 le32_to_cpu(notif->conf_id)))
 869                         goto out_unlock;
 870                 set_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status);
 871                 ieee80211_ready_on_channel(mvm->hw); /* Start TE */
 872         }
 873
 874  out_unlock:
 875         rcu_read_unlock();
 876 }
 877
 878 static int
 879 iwl_mvm_start_p2p_roc_session_protection(struct iwl_mvm *mvm,
 880                                          struct ieee80211_vif *vif,
 881                                          int duration,
 882                                          enum ieee80211_roc_type type)
 883 {
 884         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 885         struct iwl_mvm_session_prot_cmd cmd = {
 886                 .id_and_color =
 887                         cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id,
 888                                                         mvmvif->color)),
 889                 .action = cpu_to_le32(FW_CTXT_ACTION_ADD),
 890                 .duration_tu = cpu_to_le32(MSEC_TO_TU(duration)),
 891         };
 892
 893         lockdep_assert_held(&mvm->mutex);
 894
 895         /* The time_event_data.id field is reused to save session
 896          * protection's configuration.
 897          */
 898         switch (type) {
 899         case IEEE80211_ROC_TYPE_NORMAL:
 900                 mvmvif->time_event_data.id =
 901                         SESSION_PROTECT_CONF_P2P_DEVICE_DISCOV;
 902                 break;
 903         case IEEE80211_ROC_TYPE_MGMT_TX:
 904                 mvmvif->time_event_data.id =
 905                         SESSION_PROTECT_CONF_P2P_GO_NEGOTIATION;
 906                 break;
 907         default:
 908                 WARN_ONCE(1, "Got an invalid ROC type\n");
 909                 return -EINVAL;
 910         }
 911
 912         cmd.conf_id = cpu_to_le32(mvmvif->time_event_data.id);
 913         return iwl_mvm_send_cmd_pdu(mvm, iwl_cmd_id(SESSION_PROTECTION_CMD,
 914                                                     MAC_CONF_GROUP, 0),
 915                                     0, sizeof(cmd), &cmd);
 916 }
 917
 918 int iwl_mvm_start_p2p_roc(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 919                           int duration, enum ieee80211_roc_type type)
 920 {
 921         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 922         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 923         struct iwl_time_event_cmd time_cmd = {};
 924
 925         lockdep_assert_held(&mvm->mutex);
 926         if (te_data->running) {
 927                 IWL_WARN(mvm, "P2P_DEVICE remain on channel already running\n");
 928                 return -EBUSY;
 929         }
 930
 931         if (fw_has_capa(&mvm->fw->ucode_capa,
 932                         IWL_UCODE_TLV_CAPA_SESSION_PROT_CMD))
 933                 return iwl_mvm_start_p2p_roc_session_protection(mvm, vif,
 934                                                                 duration,
 935                                                                 type);
 936
 937         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
 938         time_cmd.id_and_color =
 939                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 940
 941         switch (type) {
 942         case IEEE80211_ROC_TYPE_NORMAL:
 943                 time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_NORMAL);
 944                 break;
 945         case IEEE80211_ROC_TYPE_MGMT_TX:
 946                 time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_MGMT_TX);
 947                 break;
 948         default:
 949                 WARN_ONCE(1, "Got an invalid ROC type\n");
 950                 return -EINVAL;
 951         }
 952
 953         time_cmd.apply_time = cpu_to_le32(0);
 954         time_cmd.interval = cpu_to_le32(1);
 955
 956         /*
 957          * The P2P Device TEs can have lower priority than other events
 958          * that are being scheduled by the driver/fw, and thus it might not be
 959          * scheduled. To improve the chances of it being scheduled, allow them
 960          * to be fragmented, and in addition allow them to be delayed.
 961          */
 962         time_cmd.max_frags = min(MSEC_TO_TU(duration)/50, TE_V2_FRAG_ENDLESS);
 963         time_cmd.max_delay = cpu_to_le32(MSEC_TO_TU(duration/2));
 964         time_cmd.duration = cpu_to_le32(MSEC_TO_TU(duration));
 965         time_cmd.repeat = 1;
 966         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
 967                                       TE_V2_NOTIF_HOST_EVENT_END |
 968                                       TE_V2_START_IMMEDIATELY);
 969
 970         return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
 971 }
 972
 973 static struct iwl_mvm_time_event_data *iwl_mvm_get_roc_te(struct iwl_mvm *mvm)
 974 {
 975         struct iwl_mvm_time_event_data *te_data;
 976
 977         lockdep_assert_held(&mvm->mutex);
 978
 979         spin_lock_bh(&mvm->time_event_lock);
 980
 981         /*
 982          * Iterate over the list of time events and find the time event that is
 983          * associated with a P2P_DEVICE interface.
 984          * This assumes that a P2P_DEVICE interface can have only a single time
 985          * event at any given time and this time event coresponds to a ROC
 986          * request
 987          */
 988         list_for_each_entry(te_data, &mvm->time_event_list, list) {
 989                 if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE)
 990                         goto out;
 991         }
 992
 993         /* There can only be at most one AUX ROC time event, we just use the
 994          * list to simplify/unify code. Remove it if it exists.
 995          */
 996         te_data = list_first_entry_or_null(&mvm->aux_roc_te_list,
 997                                            struct iwl_mvm_time_event_data,
 998                                            list);
 999 out:
1000         spin_unlock_bh(&mvm->time_event_lock);
1001         return te_data;
1002 }
1003
1004 void iwl_mvm_cleanup_roc_te(struct iwl_mvm *mvm)
1005 {
1006         struct iwl_mvm_time_event_data *te_data;
1007         u32 uid;
1008
1009         te_data = iwl_mvm_get_roc_te(mvm);
1010         if (te_data)
1011                 __iwl_mvm_remove_time_event(mvm, te_data, &uid);
1012 }
1013
1014 void iwl_mvm_stop_roc(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
1015 {
1016         struct iwl_mvm_vif *mvmvif;
1017         struct iwl_mvm_time_event_data *te_data;
1018
1019         if (fw_has_capa(&mvm->fw->ucode_capa,
1020                         IWL_UCODE_TLV_CAPA_SESSION_PROT_CMD)) {
1021                 mvmvif = iwl_mvm_vif_from_mac80211(vif);
1022
1023                 if (vif->type == NL80211_IFTYPE_P2P_DEVICE) {
1024                         iwl_mvm_cancel_session_protection(mvm, mvmvif,
1025                                                           mvmvif->time_event_data.id);
1026                         iwl_mvm_p2p_roc_finished(mvm);
1027                 } else {
1028                         iwl_mvm_remove_aux_roc_te(mvm, mvmvif,
1029                                                   &mvmvif->time_event_data);
1030                         iwl_mvm_roc_finished(mvm);
1031                 }
1032
1033                 return;
1034         }
1035
1036         te_data = iwl_mvm_get_roc_te(mvm);
1037         if (!te_data) {
1038                 IWL_WARN(mvm, "No remain on channel event\n");
1039                 return;
1040         }
1041
1042         mvmvif = iwl_mvm_vif_from_mac80211(te_data->vif);
1043
1044         if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) {
1045                 iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
1046                 iwl_mvm_p2p_roc_finished(mvm);
1047         } else {
1048                 iwl_mvm_remove_aux_roc_te(mvm, mvmvif, te_data);
1049                 iwl_mvm_roc_finished(mvm);
1050         }
1051 }
1052
1053 void iwl_mvm_remove_csa_period(struct iwl_mvm *mvm,
1054                                struct ieee80211_vif *vif)
1055 {
1056         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
1057         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
1058         u32 id;
1059
1060         lockdep_assert_held(&mvm->mutex);
1061
1062         spin_lock_bh(&mvm->time_event_lock);
1063         id = te_data->id;
1064         spin_unlock_bh(&mvm->time_event_lock);
1065
1066         if (id != TE_CHANNEL_SWITCH_PERIOD)
1067                 return;
1068
1069         iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
1070 }
1071
1072 int iwl_mvm_schedule_csa_period(struct iwl_mvm *mvm,
1073                                 struct ieee80211_vif *vif,
1074                                 u32 duration, u32 apply_time)
1075 {
1076         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
1077         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
1078         struct iwl_time_event_cmd time_cmd = {};
1079
1080         lockdep_assert_held(&mvm->mutex);
1081
1082         if (te_data->running) {
1083                 u32 id;
1084
1085                 spin_lock_bh(&mvm->time_event_lock);
1086                 id = te_data->id;
1087                 spin_unlock_bh(&mvm->time_event_lock);
1088
1089                 if (id == TE_CHANNEL_SWITCH_PERIOD) {
1090                         IWL_DEBUG_TE(mvm, "CS period is already scheduled\n");
1091                         return -EBUSY;
1092                 }
1093
1094                 /*
1095                  * Remove the session protection time event to allow the
1096                  * channel switch. If we got here, we just heard a beacon so
1097                  * the session protection is not needed anymore anyway.
1098                  */
1099                 iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
1100         }
1101
1102         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
1103         time_cmd.id_and_color =
1104                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
1105         time_cmd.id = cpu_to_le32(TE_CHANNEL_SWITCH_PERIOD);
1106         time_cmd.apply_time = cpu_to_le32(apply_time);
1107         time_cmd.max_frags = TE_V2_FRAG_NONE;
1108         time_cmd.duration = cpu_to_le32(duration);
1109         time_cmd.repeat = 1;
1110         time_cmd.interval = cpu_to_le32(1);
1111         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
1112                                       TE_V2_ABSENCE);
1113         if (!apply_time)
1114                 time_cmd.policy |= cpu_to_le16(TE_V2_START_IMMEDIATELY);
1115
1116         return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
1117 }
1118
1119 static bool iwl_mvm_session_prot_notif(struct iwl_notif_wait_data *notif_wait,
1120                                        struct iwl_rx_packet *pkt, void *data)
1121 {
1122         struct iwl_mvm *mvm =
1123                 container_of(notif_wait, struct iwl_mvm, notif_wait);
1124         struct iwl_mvm_session_prot_notif *resp;
1125         int resp_len = iwl_rx_packet_payload_len(pkt);
1126
1127         if (WARN_ON(pkt->hdr.cmd != SESSION_PROTECTION_NOTIF ||
1128                     pkt->hdr.group_id != MAC_CONF_GROUP))
1129                 return true;
1130
1131         if (WARN_ON_ONCE(resp_len != sizeof(*resp))) {
1132                 IWL_ERR(mvm, "Invalid SESSION_PROTECTION_NOTIF response\n");
1133                 return true;
1134         }
1135
1136         resp = (void *)pkt->data;
1137
1138         if (!resp->status)
1139                 IWL_ERR(mvm,
1140                         "TIME_EVENT_NOTIFICATION received but not executed\n");
1141
1142         return true;
1143 }
1144
1145 void iwl_mvm_schedule_session_protection(struct iwl_mvm *mvm,
1146                                          struct ieee80211_vif *vif,
1147                                          u32 duration, u32 min_duration,
1148                                          bool wait_for_notif)
1149 {
1150         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
1151         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
1152         const u16 notif[] = { iwl_cmd_id(SESSION_PROTECTION_NOTIF,
1153                                          MAC_CONF_GROUP, 0) };
1154         struct iwl_notification_wait wait_notif;
1155         struct iwl_mvm_session_prot_cmd cmd = {
1156                 .id_and_color =
1157                         cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id,
1158                                                         mvmvif->color)),
1159                 .action = cpu_to_le32(FW_CTXT_ACTION_ADD),
1160                 .duration_tu = cpu_to_le32(MSEC_TO_TU(duration)),
1161         };
1162
1163         /* The time_event_data.id field is reused to save session
1164          * protection's configuration.
1165          */
1166         mvmvif->time_event_data.id = SESSION_PROTECT_CONF_ASSOC;
1167         cmd.conf_id = cpu_to_le32(mvmvif->time_event_data.id);
1168
1169         lockdep_assert_held(&mvm->mutex);
1170
1171         spin_lock_bh(&mvm->time_event_lock);
1172         if (te_data->running &&
1173             time_after(te_data->end_jiffies, TU_TO_EXP_TIME(min_duration))) {
1174                 IWL_DEBUG_TE(mvm, "We have enough time in the current TE: %u\n",
1175                              jiffies_to_msecs(te_data->end_jiffies - jiffies));
1176                 spin_unlock_bh(&mvm->time_event_lock);
1177
1178                 return;
1179         }
1180
1181         iwl_mvm_te_clear_data(mvm, te_data);
1182         te_data->duration = le32_to_cpu(cmd.duration_tu);
1183         te_data->vif = vif;
1184         spin_unlock_bh(&mvm->time_event_lock);
1185
1186         IWL_DEBUG_TE(mvm, "Add new session protection, duration %d TU\n",
1187                      le32_to_cpu(cmd.duration_tu));
1188
1189         if (!wait_for_notif) {
1190                 if (iwl_mvm_send_cmd_pdu(mvm,
1191                                          iwl_cmd_id(SESSION_PROTECTION_CMD,
1192                                                     MAC_CONF_GROUP, 0),
1193                                          0, sizeof(cmd), &cmd)) {
1194                         IWL_ERR(mvm,
1195                                 "Couldn't send the SESSION_PROTECTION_CMD\n");
1196                         spin_lock_bh(&mvm->time_event_lock);
1197                         iwl_mvm_te_clear_data(mvm, te_data);
1198                         spin_unlock_bh(&mvm->time_event_lock);
1199                 }
1200
1201                 return;
1202         }
1203
1204         iwl_init_notification_wait(&mvm->notif_wait, &wait_notif,
1205                                    notif, ARRAY_SIZE(notif),
1206                                    iwl_mvm_session_prot_notif, NULL);
1207
1208         if (iwl_mvm_send_cmd_pdu(mvm,
1209                                  iwl_cmd_id(SESSION_PROTECTION_CMD,
1210                                             MAC_CONF_GROUP, 0),
1211                                  0, sizeof(cmd), &cmd)) {
1212                 IWL_ERR(mvm,
1213                         "Couldn't send the SESSION_PROTECTION_CMD\n");
1214                 iwl_remove_notification(&mvm->notif_wait, &wait_notif);
1215         } else if (iwl_wait_notification(&mvm->notif_wait, &wait_notif,
1216                                          TU_TO_JIFFIES(100))) {
1217                 IWL_ERR(mvm,
1218                         "Failed to protect session until session protection\n");
1219         }
1220 }