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

   1 /******************************************************************************
   2  *
   3  * This file is provided under a dual BSD/GPLv2 license.  When using or
   4  * redistributing this file, you may do so under either license.
   5  *
   6  * GPL LICENSE SUMMARY
   7  *
   8  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
   9  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
  10  * Copyright(c) 2017 Intel Deutschland GmbH
  11  * Copyright(c) 2018 Intel Corporation
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of version 2 of the GNU General Public License as
  15  * published by the Free Software Foundation.
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  23  * in the file called COPYING.
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  30  *
  31  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  32  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
  33  * Copyright(c) 2017 Intel Deutschland GmbH
  34  * Copyright(c) 2018 Intel Corporation
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  45  *    the documentation and/or other materials provided with the
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  48  *    contributors may be used to endorse or promote products derived
  49  *    from this software without specific prior written permission.
  50  *
  51  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  52  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  53  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  54  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  55  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  56  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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  58  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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  60  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  61  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  62  *
  63  *****************************************************************************/
  64
  65 #include <linux/jiffies.h>
  66 #include <net/mac80211.h>
  67
  68 #include "fw/notif-wait.h"
  69 #include "iwl-trans.h"
  70 #include "fw-api.h"
  71 #include "time-event.h"
  72 #include "mvm.h"
  73 #include "iwl-io.h"
  74 #include "iwl-prph.h"
  75
  76 /*
  77  * For the high priority TE use a time event type that has similar priority to
  78  * the FW's action scan priority.
  79  */
  80 #define IWL_MVM_ROC_TE_TYPE_NORMAL TE_P2P_DEVICE_DISCOVERABLE
  81 #define IWL_MVM_ROC_TE_TYPE_MGMT_TX TE_P2P_CLIENT_ASSOC
  82
  83 void iwl_mvm_te_clear_data(struct iwl_mvm *mvm,
  84                            struct iwl_mvm_time_event_data *te_data)
  85 {
  86         lockdep_assert_held(&mvm->time_event_lock);
  87
  88         if (!te_data->vif)
  89                 return;
  90
  91         list_del(&te_data->list);
  92         te_data->running = false;
  93         te_data->uid = 0;
  94         te_data->id = TE_MAX;
  95         te_data->vif = NULL;
  96 }
  97
  98 void iwl_mvm_roc_done_wk(struct work_struct *wk)
  99 {
 100         struct iwl_mvm *mvm = container_of(wk, struct iwl_mvm, roc_done_wk);
 101
 102         /*
 103          * Clear the ROC_RUNNING /ROC_AUX_RUNNING status bit.
 104          * This will cause the TX path to drop offchannel transmissions.
 105          * That would also be done by mac80211, but it is racy, in particular
 106          * in the case that the time event actually completed in the firmware
 107          * (which is handled in iwl_mvm_te_handle_notif).
 108          */
 109         if (test_and_clear_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status))
 110                 iwl_mvm_unref(mvm, IWL_MVM_REF_ROC);
 111         if (test_and_clear_bit(IWL_MVM_STATUS_ROC_AUX_RUNNING, &mvm->status))
 112                 iwl_mvm_unref(mvm, IWL_MVM_REF_ROC_AUX);
 113
 114         synchronize_net();
 115
 116         /*
 117          * Flush the offchannel queue -- this is called when the time
 118          * event finishes or is canceled, so that frames queued for it
 119          * won't get stuck on the queue and be transmitted in the next
 120          * time event.
 121          * We have to send the command asynchronously since this cannot
 122          * be under the mutex for locking reasons, but that's not an
 123          * issue as it will have to complete before the next command is
 124          * executed, and a new time event means a new command.
 125          */
 126         iwl_mvm_flush_sta(mvm, &mvm->aux_sta, true, CMD_ASYNC);
 127
 128         /* Do the same for the P2P device queue (STA) */
 129         if (test_and_clear_bit(IWL_MVM_STATUS_NEED_FLUSH_P2P, &mvm->status)) {
 130                 struct iwl_mvm_vif *mvmvif;
 131
 132                 /*
 133                  * NB: access to this pointer would be racy, but the flush bit
 134                  * can only be set when we had a P2P-Device VIF, and we have a
 135                  * flush of this work in iwl_mvm_prepare_mac_removal() so it's
 136                  * not really racy.
 137                  */
 138
 139                 if (!WARN_ON(!mvm->p2p_device_vif)) {
 140                         mvmvif = iwl_mvm_vif_from_mac80211(mvm->p2p_device_vif);
 141                         iwl_mvm_flush_sta(mvm, &mvmvif->bcast_sta, true,
 142                                           CMD_ASYNC);
 143                 }
 144         }
 145 }
 146
 147 static void iwl_mvm_roc_finished(struct iwl_mvm *mvm)
 148 {
 149         /*
 150          * Of course, our status bit is just as racy as mac80211, so in
 151          * addition, fire off the work struct which will drop all frames
 152          * from the hardware queues that made it through the race. First
 153          * it will of course synchronize the TX path to make sure that
 154          * any *new* TX will be rejected.
 155          */
 156         schedule_work(&mvm->roc_done_wk);
 157 }
 158
 159 static void iwl_mvm_csa_noa_start(struct iwl_mvm *mvm)
 160 {
 161         struct ieee80211_vif *csa_vif;
 162
 163         rcu_read_lock();
 164
 165         csa_vif = rcu_dereference(mvm->csa_vif);
 166         if (!csa_vif || !csa_vif->csa_active)
 167                 goto out_unlock;
 168
 169         IWL_DEBUG_TE(mvm, "CSA NOA started\n");
 170
 171         /*
 172          * CSA NoA is started but we still have beacons to
 173          * transmit on the current channel.
 174          * So we just do nothing here and the switch
 175          * will be performed on the last TBTT.
 176          */
 177         if (!ieee80211_csa_is_complete(csa_vif)) {
 178                 IWL_WARN(mvm, "CSA NOA started too early\n");
 179                 goto out_unlock;
 180         }
 181
 182         ieee80211_csa_finish(csa_vif);
 183
 184         rcu_read_unlock();
 185
 186         RCU_INIT_POINTER(mvm->csa_vif, NULL);
 187
 188         return;
 189
 190 out_unlock:
 191         rcu_read_unlock();
 192 }
 193
 194 static bool iwl_mvm_te_check_disconnect(struct iwl_mvm *mvm,
 195                                         struct ieee80211_vif *vif,
 196                                         const char *errmsg)
 197 {
 198         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 199
 200         if (vif->type != NL80211_IFTYPE_STATION)
 201                 return false;
 202
 203         if (!mvmvif->csa_bcn_pending && vif->bss_conf.assoc &&
 204             vif->bss_conf.dtim_period)
 205                 return false;
 206         if (errmsg)
 207                 IWL_ERR(mvm, "%s\n", errmsg);
 208
 209         iwl_mvm_connection_loss(mvm, vif, errmsg);
 210         return true;
 211 }
 212
 213 static void
 214 iwl_mvm_te_handle_notify_csa(struct iwl_mvm *mvm,
 215                              struct iwl_mvm_time_event_data *te_data,
 216                              struct iwl_time_event_notif *notif)
 217 {
 218         struct ieee80211_vif *vif = te_data->vif;
 219         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 220
 221         if (!notif->status)
 222                 IWL_DEBUG_TE(mvm, "CSA time event failed to start\n");
 223
 224         switch (te_data->vif->type) {
 225         case NL80211_IFTYPE_AP:
 226                 if (!notif->status)
 227                         mvmvif->csa_failed = true;
 228                 iwl_mvm_csa_noa_start(mvm);
 229                 break;
 230         case NL80211_IFTYPE_STATION:
 231                 if (!notif->status) {
 232                         iwl_mvm_connection_loss(mvm, vif,
 233                                                 "CSA TE failed to start");
 234                         break;
 235                 }
 236                 iwl_mvm_csa_client_absent(mvm, te_data->vif);
 237                 ieee80211_chswitch_done(te_data->vif, true);
 238                 break;
 239         default:
 240                 /* should never happen */
 241                 WARN_ON_ONCE(1);
 242                 break;
 243         }
 244
 245         /* we don't need it anymore */
 246         iwl_mvm_te_clear_data(mvm, te_data);
 247 }
 248
 249 static void iwl_mvm_te_check_trigger(struct iwl_mvm *mvm,
 250                                      struct iwl_time_event_notif *notif,
 251                                      struct iwl_mvm_time_event_data *te_data)
 252 {
 253         struct iwl_fw_dbg_trigger_tlv *trig;
 254         struct iwl_fw_dbg_trigger_time_event *te_trig;
 255         int i;
 256
 257         trig = iwl_fw_dbg_trigger_on(&mvm->fwrt,
 258                                      ieee80211_vif_to_wdev(te_data->vif),
 259                                      FW_DBG_TRIGGER_TIME_EVENT);
 260         if (!trig)
 261                 return;
 262
 263         te_trig = (void *)trig->data;
 264
 265         for (i = 0; i < ARRAY_SIZE(te_trig->time_events); i++) {
 266                 u32 trig_te_id = le32_to_cpu(te_trig->time_events[i].id);
 267                 u32 trig_action_bitmap =
 268                         le32_to_cpu(te_trig->time_events[i].action_bitmap);
 269                 u32 trig_status_bitmap =
 270                         le32_to_cpu(te_trig->time_events[i].status_bitmap);
 271
 272                 if (trig_te_id != te_data->id ||
 273                     !(trig_action_bitmap & le32_to_cpu(notif->action)) ||
 274                     !(trig_status_bitmap & BIT(le32_to_cpu(notif->status))))
 275                         continue;
 276
 277                 iwl_fw_dbg_collect_trig(&mvm->fwrt, trig,
 278                                         "Time event %d Action 0x%x received status: %d",
 279                                         te_data->id,
 280                                         le32_to_cpu(notif->action),
 281                                         le32_to_cpu(notif->status));
 282                 break;
 283         }
 284 }
 285
 286 /*
 287  * Handles a FW notification for an event that is known to the driver.
 288  *
 289  * @mvm: the mvm component
 290  * @te_data: the time event data
 291  * @notif: the notification data corresponding the time event data.
 292  */
 293 static void iwl_mvm_te_handle_notif(struct iwl_mvm *mvm,
 294                                     struct iwl_mvm_time_event_data *te_data,
 295                                     struct iwl_time_event_notif *notif)
 296 {
 297         lockdep_assert_held(&mvm->time_event_lock);
 298
 299         IWL_DEBUG_TE(mvm, "Handle time event notif - UID = 0x%x action %d\n",
 300                      le32_to_cpu(notif->unique_id),
 301                      le32_to_cpu(notif->action));
 302
 303         iwl_mvm_te_check_trigger(mvm, notif, te_data);
 304
 305         /*
 306          * The FW sends the start/end time event notifications even for events
 307          * that it fails to schedule. This is indicated in the status field of
 308          * the notification. This happens in cases that the scheduler cannot
 309          * find a schedule that can handle the event (for example requesting a
 310          * P2P Device discoveribility, while there are other higher priority
 311          * events in the system).
 312          */
 313         if (!le32_to_cpu(notif->status)) {
 314                 const char *msg;
 315
 316                 if (notif->action & cpu_to_le32(TE_V2_NOTIF_HOST_EVENT_START))
 317                         msg = "Time Event start notification failure";
 318                 else
 319                         msg = "Time Event end notification failure";
 320
 321                 IWL_DEBUG_TE(mvm, "%s\n", msg);
 322
 323                 if (iwl_mvm_te_check_disconnect(mvm, te_data->vif, msg)) {
 324                         iwl_mvm_te_clear_data(mvm, te_data);
 325                         return;
 326                 }
 327         }
 328
 329         if (le32_to_cpu(notif->action) & TE_V2_NOTIF_HOST_EVENT_END) {
 330                 IWL_DEBUG_TE(mvm,
 331                              "TE ended - current time %lu, estimated end %lu\n",
 332                              jiffies, te_data->end_jiffies);
 333
 334                 switch (te_data->vif->type) {
 335                 case NL80211_IFTYPE_P2P_DEVICE:
 336                         ieee80211_remain_on_channel_expired(mvm->hw);
 337                         iwl_mvm_roc_finished(mvm);
 338                         break;
 339                 case NL80211_IFTYPE_STATION:
 340                         /*
 341                          * By now, we should have finished association
 342                          * and know the dtim period.
 343                          */
 344                         iwl_mvm_te_check_disconnect(mvm, te_data->vif,
 345                                 "No beacon heard and the time event is over already...");
 346                         break;
 347                 default:
 348                         break;
 349                 }
 350
 351                 iwl_mvm_te_clear_data(mvm, te_data);
 352         } else if (le32_to_cpu(notif->action) & TE_V2_NOTIF_HOST_EVENT_START) {
 353                 te_data->running = true;
 354                 te_data->end_jiffies = TU_TO_EXP_TIME(te_data->duration);
 355
 356                 if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) {
 357                         set_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status);
 358                         iwl_mvm_ref(mvm, IWL_MVM_REF_ROC);
 359                         ieee80211_ready_on_channel(mvm->hw);
 360                 } else if (te_data->id == TE_CHANNEL_SWITCH_PERIOD) {
 361                         iwl_mvm_te_handle_notify_csa(mvm, te_data, notif);
 362                 }
 363         } else {
 364                 IWL_WARN(mvm, "Got TE with unknown action\n");
 365         }
 366 }
 367
 368 /*
 369  * Handle A Aux ROC time event
 370  */
 371 static int iwl_mvm_aux_roc_te_handle_notif(struct iwl_mvm *mvm,
 372                                            struct iwl_time_event_notif *notif)
 373 {
 374         struct iwl_mvm_time_event_data *te_data, *tmp;
 375         bool aux_roc_te = false;
 376
 377         list_for_each_entry_safe(te_data, tmp, &mvm->aux_roc_te_list, list) {
 378                 if (le32_to_cpu(notif->unique_id) == te_data->uid) {
 379                         aux_roc_te = true;
 380                         break;
 381                 }
 382         }
 383         if (!aux_roc_te) /* Not a Aux ROC time event */
 384                 return -EINVAL;
 385
 386         iwl_mvm_te_check_trigger(mvm, notif, te_data);
 387
 388         IWL_DEBUG_TE(mvm,
 389                      "Aux ROC time event notification  - UID = 0x%x action %d (error = %d)\n",
 390                      le32_to_cpu(notif->unique_id),
 391                      le32_to_cpu(notif->action), le32_to_cpu(notif->status));
 392
 393         if (!le32_to_cpu(notif->status) ||
 394             le32_to_cpu(notif->action) == TE_V2_NOTIF_HOST_EVENT_END) {
 395                 /* End TE, notify mac80211 */
 396                 ieee80211_remain_on_channel_expired(mvm->hw);
 397                 iwl_mvm_roc_finished(mvm); /* flush aux queue */
 398                 list_del(&te_data->list); /* remove from list */
 399                 te_data->running = false;
 400                 te_data->vif = NULL;
 401                 te_data->uid = 0;
 402                 te_data->id = TE_MAX;
 403         } else if (le32_to_cpu(notif->action) == TE_V2_NOTIF_HOST_EVENT_START) {
 404                 set_bit(IWL_MVM_STATUS_ROC_AUX_RUNNING, &mvm->status);
 405                 te_data->running = true;
 406                 iwl_mvm_ref(mvm, IWL_MVM_REF_ROC_AUX);
 407                 ieee80211_ready_on_channel(mvm->hw); /* Start TE */
 408         } else {
 409                 IWL_DEBUG_TE(mvm,
 410                              "ERROR: Unknown Aux ROC Time Event (action = %d)\n",
 411                              le32_to_cpu(notif->action));
 412                 return -EINVAL;
 413         }
 414
 415         return 0;
 416 }
 417
 418 /*
 419  * The Rx handler for time event notifications
 420  */
 421 void iwl_mvm_rx_time_event_notif(struct iwl_mvm *mvm,
 422                                  struct iwl_rx_cmd_buffer *rxb)
 423 {
 424         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 425         struct iwl_time_event_notif *notif = (void *)pkt->data;
 426         struct iwl_mvm_time_event_data *te_data, *tmp;
 427
 428         IWL_DEBUG_TE(mvm, "Time event notification - UID = 0x%x action %d\n",
 429                      le32_to_cpu(notif->unique_id),
 430                      le32_to_cpu(notif->action));
 431
 432         spin_lock_bh(&mvm->time_event_lock);
 433         /* This time event is triggered for Aux ROC request */
 434         if (!iwl_mvm_aux_roc_te_handle_notif(mvm, notif))
 435                 goto unlock;
 436
 437         list_for_each_entry_safe(te_data, tmp, &mvm->time_event_list, list) {
 438                 if (le32_to_cpu(notif->unique_id) == te_data->uid)
 439                         iwl_mvm_te_handle_notif(mvm, te_data, notif);
 440         }
 441 unlock:
 442         spin_unlock_bh(&mvm->time_event_lock);
 443 }
 444
 445 static bool iwl_mvm_te_notif(struct iwl_notif_wait_data *notif_wait,
 446                              struct iwl_rx_packet *pkt, void *data)
 447 {
 448         struct iwl_mvm *mvm =
 449                 container_of(notif_wait, struct iwl_mvm, notif_wait);
 450         struct iwl_mvm_time_event_data *te_data = data;
 451         struct iwl_time_event_notif *resp;
 452         int resp_len = iwl_rx_packet_payload_len(pkt);
 453
 454         if (WARN_ON(pkt->hdr.cmd != TIME_EVENT_NOTIFICATION))
 455                 return true;
 456
 457         if (WARN_ON_ONCE(resp_len != sizeof(*resp))) {
 458                 IWL_ERR(mvm, "Invalid TIME_EVENT_NOTIFICATION response\n");
 459                 return true;
 460         }
 461
 462         resp = (void *)pkt->data;
 463
 464         /* te_data->uid is already set in the TIME_EVENT_CMD response */
 465         if (le32_to_cpu(resp->unique_id) != te_data->uid)
 466                 return false;
 467
 468         IWL_DEBUG_TE(mvm, "TIME_EVENT_NOTIFICATION response - UID = 0x%x\n",
 469                      te_data->uid);
 470         if (!resp->status)
 471                 IWL_ERR(mvm,
 472                         "TIME_EVENT_NOTIFICATION received but not executed\n");
 473
 474         return true;
 475 }
 476
 477 static bool iwl_mvm_time_event_response(struct iwl_notif_wait_data *notif_wait,
 478                                         struct iwl_rx_packet *pkt, void *data)
 479 {
 480         struct iwl_mvm *mvm =
 481                 container_of(notif_wait, struct iwl_mvm, notif_wait);
 482         struct iwl_mvm_time_event_data *te_data = data;
 483         struct iwl_time_event_resp *resp;
 484         int resp_len = iwl_rx_packet_payload_len(pkt);
 485
 486         if (WARN_ON(pkt->hdr.cmd != TIME_EVENT_CMD))
 487                 return true;
 488
 489         if (WARN_ON_ONCE(resp_len != sizeof(*resp))) {
 490                 IWL_ERR(mvm, "Invalid TIME_EVENT_CMD response\n");
 491                 return true;
 492         }
 493
 494         resp = (void *)pkt->data;
 495
 496         /* we should never get a response to another TIME_EVENT_CMD here */
 497         if (WARN_ON_ONCE(le32_to_cpu(resp->id) != te_data->id))
 498                 return false;
 499
 500         te_data->uid = le32_to_cpu(resp->unique_id);
 501         IWL_DEBUG_TE(mvm, "TIME_EVENT_CMD response - UID = 0x%x\n",
 502                      te_data->uid);
 503         return true;
 504 }
 505
 506 static int iwl_mvm_time_event_send_add(struct iwl_mvm *mvm,
 507                                        struct ieee80211_vif *vif,
 508                                        struct iwl_mvm_time_event_data *te_data,
 509                                        struct iwl_time_event_cmd *te_cmd)
 510 {
 511         static const u16 time_event_response[] = { TIME_EVENT_CMD };
 512         struct iwl_notification_wait wait_time_event;
 513         int ret;
 514
 515         lockdep_assert_held(&mvm->mutex);
 516
 517         IWL_DEBUG_TE(mvm, "Add new TE, duration %d TU\n",
 518                      le32_to_cpu(te_cmd->duration));
 519
 520         spin_lock_bh(&mvm->time_event_lock);
 521         if (WARN_ON(te_data->id != TE_MAX)) {
 522                 spin_unlock_bh(&mvm->time_event_lock);
 523                 return -EIO;
 524         }
 525         te_data->vif = vif;
 526         te_data->duration = le32_to_cpu(te_cmd->duration);
 527         te_data->id = le32_to_cpu(te_cmd->id);
 528         list_add_tail(&te_data->list, &mvm->time_event_list);
 529         spin_unlock_bh(&mvm->time_event_lock);
 530
 531         /*
 532          * Use a notification wait, which really just processes the
 533          * command response and doesn't wait for anything, in order
 534          * to be able to process the response and get the UID inside
 535          * the RX path. Using CMD_WANT_SKB doesn't work because it
 536          * stores the buffer and then wakes up this thread, by which
 537          * time another notification (that the time event started)
 538          * might already be processed unsuccessfully.
 539          */
 540         iwl_init_notification_wait(&mvm->notif_wait, &wait_time_event,
 541                                    time_event_response,
 542                                    ARRAY_SIZE(time_event_response),
 543                                    iwl_mvm_time_event_response, te_data);
 544
 545         ret = iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, 0,
 546                                             sizeof(*te_cmd), te_cmd);
 547         if (ret) {
 548                 IWL_ERR(mvm, "Couldn't send TIME_EVENT_CMD: %d\n", ret);
 549                 iwl_remove_notification(&mvm->notif_wait, &wait_time_event);
 550                 goto out_clear_te;
 551         }
 552
 553         /* No need to wait for anything, so just pass 1 (0 isn't valid) */
 554         ret = iwl_wait_notification(&mvm->notif_wait, &wait_time_event, 1);
 555         /* should never fail */
 556         WARN_ON_ONCE(ret);
 557
 558         if (ret) {
 559  out_clear_te:
 560                 spin_lock_bh(&mvm->time_event_lock);
 561                 iwl_mvm_te_clear_data(mvm, te_data);
 562                 spin_unlock_bh(&mvm->time_event_lock);
 563         }
 564         return ret;
 565 }
 566
 567 void iwl_mvm_protect_session(struct iwl_mvm *mvm,
 568                              struct ieee80211_vif *vif,
 569                              u32 duration, u32 min_duration,
 570                              u32 max_delay, bool wait_for_notif)
 571 {
 572         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 573         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 574         const u16 te_notif_response[] = { TIME_EVENT_NOTIFICATION };
 575         struct iwl_notification_wait wait_te_notif;
 576         struct iwl_time_event_cmd time_cmd = {};
 577
 578         lockdep_assert_held(&mvm->mutex);
 579
 580         if (te_data->running &&
 581             time_after(te_data->end_jiffies, TU_TO_EXP_TIME(min_duration))) {
 582                 IWL_DEBUG_TE(mvm, "We have enough time in the current TE: %u\n",
 583                              jiffies_to_msecs(te_data->end_jiffies - jiffies));
 584                 return;
 585         }
 586
 587         if (te_data->running) {
 588                 IWL_DEBUG_TE(mvm, "extend 0x%x: only %u ms left\n",
 589                              te_data->uid,
 590                              jiffies_to_msecs(te_data->end_jiffies - jiffies));
 591                 /*
 592                  * we don't have enough time
 593                  * cancel the current TE and issue a new one
 594                  * Of course it would be better to remove the old one only
 595                  * when the new one is added, but we don't care if we are off
 596                  * channel for a bit. All we need to do, is not to return
 597                  * before we actually begin to be on the channel.
 598                  */
 599                 iwl_mvm_stop_session_protection(mvm, vif);
 600         }
 601
 602         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
 603         time_cmd.id_and_color =
 604                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 605         time_cmd.id = cpu_to_le32(TE_BSS_STA_AGGRESSIVE_ASSOC);
 606
 607         time_cmd.apply_time = cpu_to_le32(0);
 608
 609         time_cmd.max_frags = TE_V2_FRAG_NONE;
 610         time_cmd.max_delay = cpu_to_le32(max_delay);
 611         /* TODO: why do we need to interval = bi if it is not periodic? */
 612         time_cmd.interval = cpu_to_le32(1);
 613         time_cmd.duration = cpu_to_le32(duration);
 614         time_cmd.repeat = 1;
 615         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
 616                                       TE_V2_NOTIF_HOST_EVENT_END |
 617                                       TE_V2_START_IMMEDIATELY);
 618
 619         if (!wait_for_notif) {
 620                 iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
 621                 return;
 622         }
 623
 624         /*
 625          * Create notification_wait for the TIME_EVENT_NOTIFICATION to use
 626          * right after we send the time event
 627          */
 628         iwl_init_notification_wait(&mvm->notif_wait, &wait_te_notif,
 629                                    te_notif_response,
 630                                    ARRAY_SIZE(te_notif_response),
 631                                    iwl_mvm_te_notif, te_data);
 632
 633         /* If TE was sent OK - wait for the notification that started */
 634         if (iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd)) {
 635                 IWL_ERR(mvm, "Failed to add TE to protect session\n");
 636                 iwl_remove_notification(&mvm->notif_wait, &wait_te_notif);
 637         } else if (iwl_wait_notification(&mvm->notif_wait, &wait_te_notif,
 638                                          TU_TO_JIFFIES(max_delay))) {
 639                 IWL_ERR(mvm, "Failed to protect session until TE\n");
 640         }
 641 }
 642
 643 static bool __iwl_mvm_remove_time_event(struct iwl_mvm *mvm,
 644                                         struct iwl_mvm_time_event_data *te_data,
 645                                         u32 *uid)
 646 {
 647         u32 id;
 648
 649         /*
 650          * It is possible that by the time we got to this point the time
 651          * event was already removed.
 652          */
 653         spin_lock_bh(&mvm->time_event_lock);
 654
 655         /* Save time event uid before clearing its data */
 656         *uid = te_data->uid;
 657         id = te_data->id;
 658
 659         /*
 660          * The clear_data function handles time events that were already removed
 661          */
 662         iwl_mvm_te_clear_data(mvm, te_data);
 663         spin_unlock_bh(&mvm->time_event_lock);
 664
 665         /*
 666          * It is possible that by the time we try to remove it, the time event
 667          * has already ended and removed. In such a case there is no need to
 668          * send a removal command.
 669          */
 670         if (id == TE_MAX) {
 671                 IWL_DEBUG_TE(mvm, "TE 0x%x has already ended\n", *uid);
 672                 return false;
 673         }
 674
 675         return true;
 676 }
 677
 678 /*
 679  * Explicit request to remove a aux roc time event. The removal of a time
 680  * event needs to be synchronized with the flow of a time event's end
 681  * notification, which also removes the time event from the op mode
 682  * data structures.
 683  */
 684 static void iwl_mvm_remove_aux_roc_te(struct iwl_mvm *mvm,
 685                                       struct iwl_mvm_vif *mvmvif,
 686                                       struct iwl_mvm_time_event_data *te_data)
 687 {
 688         struct iwl_hs20_roc_req aux_cmd = {};
 689         u32 uid;
 690         int ret;
 691
 692         if (!__iwl_mvm_remove_time_event(mvm, te_data, &uid))
 693                 return;
 694
 695         aux_cmd.event_unique_id = cpu_to_le32(uid);
 696         aux_cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE);
 697         aux_cmd.id_and_color =
 698                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 699         IWL_DEBUG_TE(mvm, "Removing BSS AUX ROC TE 0x%x\n",
 700                      le32_to_cpu(aux_cmd.event_unique_id));
 701         ret = iwl_mvm_send_cmd_pdu(mvm, HOT_SPOT_CMD, 0,
 702                                    sizeof(aux_cmd), &aux_cmd);
 703
 704         if (WARN_ON(ret))
 705                 return;
 706 }
 707
 708 /*
 709  * Explicit request to remove a time event. The removal of a time event needs to
 710  * be synchronized with the flow of a time event's end notification, which also
 711  * removes the time event from the op mode data structures.
 712  */
 713 void iwl_mvm_remove_time_event(struct iwl_mvm *mvm,
 714                                struct iwl_mvm_vif *mvmvif,
 715                                struct iwl_mvm_time_event_data *te_data)
 716 {
 717         struct iwl_time_event_cmd time_cmd = {};
 718         u32 uid;
 719         int ret;
 720
 721         if (!__iwl_mvm_remove_time_event(mvm, te_data, &uid))
 722                 return;
 723
 724         /* When we remove a TE, the UID is to be set in the id field */
 725         time_cmd.id = cpu_to_le32(uid);
 726         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE);
 727         time_cmd.id_and_color =
 728                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 729
 730         IWL_DEBUG_TE(mvm, "Removing TE 0x%x\n", le32_to_cpu(time_cmd.id));
 731         ret = iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, 0,
 732                                    sizeof(time_cmd), &time_cmd);
 733         if (WARN_ON(ret))
 734                 return;
 735 }
 736
 737 void iwl_mvm_stop_session_protection(struct iwl_mvm *mvm,
 738                                      struct ieee80211_vif *vif)
 739 {
 740         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 741         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 742         u32 id;
 743
 744         lockdep_assert_held(&mvm->mutex);
 745
 746         spin_lock_bh(&mvm->time_event_lock);
 747         id = te_data->id;
 748         spin_unlock_bh(&mvm->time_event_lock);
 749
 750         if (id != TE_BSS_STA_AGGRESSIVE_ASSOC) {
 751                 IWL_DEBUG_TE(mvm,
 752                              "don't remove TE with id=%u (not session protection)\n",
 753                              id);
 754                 return;
 755         }
 756
 757         iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
 758 }
 759
 760 int iwl_mvm_start_p2p_roc(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 761                           int duration, enum ieee80211_roc_type type)
 762 {
 763         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 764         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 765         struct iwl_time_event_cmd time_cmd = {};
 766
 767         lockdep_assert_held(&mvm->mutex);
 768         if (te_data->running) {
 769                 IWL_WARN(mvm, "P2P_DEVICE remain on channel already running\n");
 770                 return -EBUSY;
 771         }
 772
 773         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
 774         time_cmd.id_and_color =
 775                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 776
 777         switch (type) {
 778         case IEEE80211_ROC_TYPE_NORMAL:
 779                 time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_NORMAL);
 780                 break;
 781         case IEEE80211_ROC_TYPE_MGMT_TX:
 782                 time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_MGMT_TX);
 783                 break;
 784         default:
 785                 WARN_ONCE(1, "Got an invalid ROC type\n");
 786                 return -EINVAL;
 787         }
 788
 789         time_cmd.apply_time = cpu_to_le32(0);
 790         time_cmd.interval = cpu_to_le32(1);
 791
 792         /*
 793          * The P2P Device TEs can have lower priority than other events
 794          * that are being scheduled by the driver/fw, and thus it might not be
 795          * scheduled. To improve the chances of it being scheduled, allow them
 796          * to be fragmented, and in addition allow them to be delayed.
 797          */
 798         time_cmd.max_frags = min(MSEC_TO_TU(duration)/50, TE_V2_FRAG_ENDLESS);
 799         time_cmd.max_delay = cpu_to_le32(MSEC_TO_TU(duration/2));
 800         time_cmd.duration = cpu_to_le32(MSEC_TO_TU(duration));
 801         time_cmd.repeat = 1;
 802         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
 803                                       TE_V2_NOTIF_HOST_EVENT_END |
 804                                       TE_V2_START_IMMEDIATELY);
 805
 806         return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
 807 }
 808
 809 static struct iwl_mvm_time_event_data *iwl_mvm_get_roc_te(struct iwl_mvm *mvm)
 810 {
 811         struct iwl_mvm_time_event_data *te_data;
 812
 813         lockdep_assert_held(&mvm->mutex);
 814
 815         spin_lock_bh(&mvm->time_event_lock);
 816
 817         /*
 818          * Iterate over the list of time events and find the time event that is
 819          * associated with a P2P_DEVICE interface.
 820          * This assumes that a P2P_DEVICE interface can have only a single time
 821          * event at any given time and this time event coresponds to a ROC
 822          * request
 823          */
 824         list_for_each_entry(te_data, &mvm->time_event_list, list) {
 825                 if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE)
 826                         goto out;
 827         }
 828
 829         /* There can only be at most one AUX ROC time event, we just use the
 830          * list to simplify/unify code. Remove it if it exists.
 831          */
 832         te_data = list_first_entry_or_null(&mvm->aux_roc_te_list,
 833                                            struct iwl_mvm_time_event_data,
 834                                            list);
 835 out:
 836         spin_unlock_bh(&mvm->time_event_lock);
 837         return te_data;
 838 }
 839
 840 void iwl_mvm_cleanup_roc_te(struct iwl_mvm *mvm)
 841 {
 842         struct iwl_mvm_time_event_data *te_data;
 843         u32 uid;
 844
 845         te_data = iwl_mvm_get_roc_te(mvm);
 846         if (te_data)
 847                 __iwl_mvm_remove_time_event(mvm, te_data, &uid);
 848 }
 849
 850 void iwl_mvm_stop_roc(struct iwl_mvm *mvm)
 851 {
 852         struct iwl_mvm_vif *mvmvif;
 853         struct iwl_mvm_time_event_data *te_data;
 854
 855         te_data = iwl_mvm_get_roc_te(mvm);
 856         if (!te_data) {
 857                 IWL_WARN(mvm, "No remain on channel event\n");
 858                 return;
 859         }
 860
 861         mvmvif = iwl_mvm_vif_from_mac80211(te_data->vif);
 862
 863         if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) {
 864                 iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
 865                 set_bit(IWL_MVM_STATUS_NEED_FLUSH_P2P, &mvm->status);
 866         } else {
 867                 iwl_mvm_remove_aux_roc_te(mvm, mvmvif, te_data);
 868         }
 869
 870         iwl_mvm_roc_finished(mvm);
 871 }
 872
 873 int iwl_mvm_schedule_csa_period(struct iwl_mvm *mvm,
 874                                 struct ieee80211_vif *vif,
 875                                 u32 duration, u32 apply_time)
 876 {
 877         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 878         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 879         struct iwl_time_event_cmd time_cmd = {};
 880
 881         lockdep_assert_held(&mvm->mutex);
 882
 883         if (te_data->running) {
 884                 u32 id;
 885
 886                 spin_lock_bh(&mvm->time_event_lock);
 887                 id = te_data->id;
 888                 spin_unlock_bh(&mvm->time_event_lock);
 889
 890                 if (id == TE_CHANNEL_SWITCH_PERIOD) {
 891                         IWL_DEBUG_TE(mvm, "CS period is already scheduled\n");
 892                         return -EBUSY;
 893                 }
 894
 895                 /*
 896                  * Remove the session protection time event to allow the
 897                  * channel switch. If we got here, we just heard a beacon so
 898                  * the session protection is not needed anymore anyway.
 899                  */
 900                 iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
 901         }
 902
 903         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
 904         time_cmd.id_and_color =
 905                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 906         time_cmd.id = cpu_to_le32(TE_CHANNEL_SWITCH_PERIOD);
 907         time_cmd.apply_time = cpu_to_le32(apply_time);
 908         time_cmd.max_frags = TE_V2_FRAG_NONE;
 909         time_cmd.duration = cpu_to_le32(duration);
 910         time_cmd.repeat = 1;
 911         time_cmd.interval = cpu_to_le32(1);
 912         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
 913                                       TE_V2_ABSENCE);
 914         if (!apply_time)
 915                 time_cmd.policy |= cpu_to_le16(TE_V2_START_IMMEDIATELY);
 916
 917         return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
 918 }