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  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of version 2 of the GNU General Public License as
  13  * published by the Free Software Foundation.
  14  *
  15  * This program is distributed in the hope that it will be useful, but
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  29  *  Intel Linux Wireless <linuxwifi@intel.com>
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  31  *
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  33  *
  34  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  35  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
  36  * All rights reserved.
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  39  * modification, are permitted provided that the following conditions
  40  * are met:
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  43  *    notice, this list of conditions and the following disclaimer.
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  46  *    the documentation and/or other materials provided with the
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  50  *    from this software without specific prior written permission.
  51  *
  52  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  53  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  54  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  55  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  56  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  62  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  63  *
  64  *****************************************************************************/
  65
  66 #include <linux/jiffies.h>
  67 #include <net/mac80211.h>
  68
  69 #include "iwl-notif-wait.h"
  70 #include "iwl-trans.h"
  71 #include "fw-api.h"
  72 #include "time-event.h"
  73 #include "mvm.h"
  74 #include "iwl-io.h"
  75 #include "iwl-prph.h"
  76 #include "fw-dbg.h"
  77
  78 /*
  79  * For the high priority TE use a time event type that has similar priority to
  80  * the FW's action scan priority.
  81  */
  82 #define IWL_MVM_ROC_TE_TYPE_NORMAL TE_P2P_DEVICE_DISCOVERABLE
  83 #define IWL_MVM_ROC_TE_TYPE_MGMT_TX TE_P2P_CLIENT_ASSOC
  84
  85 void iwl_mvm_te_clear_data(struct iwl_mvm *mvm,
  86                            struct iwl_mvm_time_event_data *te_data)
  87 {
  88         lockdep_assert_held(&mvm->time_event_lock);
  89
  90         if (!te_data->vif)
  91                 return;
  92
  93         list_del(&te_data->list);
  94         te_data->running = false;
  95         te_data->uid = 0;
  96         te_data->id = TE_MAX;
  97         te_data->vif = NULL;
  98 }
  99
 100 void iwl_mvm_roc_done_wk(struct work_struct *wk)
 101 {
 102         struct iwl_mvm *mvm = container_of(wk, struct iwl_mvm, roc_done_wk);
 103         u32 queues = 0;
 104
 105         /*
 106          * Clear the ROC_RUNNING /ROC_AUX_RUNNING status bit.
 107          * This will cause the TX path to drop offchannel transmissions.
 108          * That would also be done by mac80211, but it is racy, in particular
 109          * in the case that the time event actually completed in the firmware
 110          * (which is handled in iwl_mvm_te_handle_notif).
 111          */
 112         if (test_and_clear_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status)) {
 113                 queues |= BIT(IWL_MVM_OFFCHANNEL_QUEUE);
 114                 iwl_mvm_unref(mvm, IWL_MVM_REF_ROC);
 115         }
 116         if (test_and_clear_bit(IWL_MVM_STATUS_ROC_AUX_RUNNING, &mvm->status)) {
 117                 queues |= BIT(mvm->aux_queue);
 118                 iwl_mvm_unref(mvm, IWL_MVM_REF_ROC_AUX);
 119         }
 120
 121         synchronize_net();
 122
 123         /*
 124          * Flush the offchannel queue -- this is called when the time
 125          * event finishes or is canceled, so that frames queued for it
 126          * won't get stuck on the queue and be transmitted in the next
 127          * time event.
 128          * We have to send the command asynchronously since this cannot
 129          * be under the mutex for locking reasons, but that's not an
 130          * issue as it will have to complete before the next command is
 131          * executed, and a new time event means a new command.
 132          */
 133         iwl_mvm_flush_tx_path(mvm, queues, CMD_ASYNC);
 134 }
 135
 136 static void iwl_mvm_roc_finished(struct iwl_mvm *mvm)
 137 {
 138         /*
 139          * Of course, our status bit is just as racy as mac80211, so in
 140          * addition, fire off the work struct which will drop all frames
 141          * from the hardware queues that made it through the race. First
 142          * it will of course synchronize the TX path to make sure that
 143          * any *new* TX will be rejected.
 144          */
 145         schedule_work(&mvm->roc_done_wk);
 146 }
 147
 148 static void iwl_mvm_csa_noa_start(struct iwl_mvm *mvm)
 149 {
 150         struct ieee80211_vif *csa_vif;
 151
 152         rcu_read_lock();
 153
 154         csa_vif = rcu_dereference(mvm->csa_vif);
 155         if (!csa_vif || !csa_vif->csa_active)
 156                 goto out_unlock;
 157
 158         IWL_DEBUG_TE(mvm, "CSA NOA started\n");
 159
 160         /*
 161          * CSA NoA is started but we still have beacons to
 162          * transmit on the current channel.
 163          * So we just do nothing here and the switch
 164          * will be performed on the last TBTT.
 165          */
 166         if (!ieee80211_csa_is_complete(csa_vif)) {
 167                 IWL_WARN(mvm, "CSA NOA started too early\n");
 168                 goto out_unlock;
 169         }
 170
 171         ieee80211_csa_finish(csa_vif);
 172
 173         rcu_read_unlock();
 174
 175         RCU_INIT_POINTER(mvm->csa_vif, NULL);
 176
 177         return;
 178
 179 out_unlock:
 180         rcu_read_unlock();
 181 }
 182
 183 static bool iwl_mvm_te_check_disconnect(struct iwl_mvm *mvm,
 184                                         struct ieee80211_vif *vif,
 185                                         const char *errmsg)
 186 {
 187         if (vif->type != NL80211_IFTYPE_STATION)
 188                 return false;
 189         if (vif->bss_conf.assoc && vif->bss_conf.dtim_period)
 190                 return false;
 191         if (errmsg)
 192                 IWL_ERR(mvm, "%s\n", errmsg);
 193
 194         iwl_mvm_connection_loss(mvm, vif, errmsg);
 195         return true;
 196 }
 197
 198 static void
 199 iwl_mvm_te_handle_notify_csa(struct iwl_mvm *mvm,
 200                              struct iwl_mvm_time_event_data *te_data,
 201                              struct iwl_time_event_notif *notif)
 202 {
 203         struct ieee80211_vif *vif = te_data->vif;
 204         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 205
 206         if (!notif->status)
 207                 IWL_DEBUG_TE(mvm, "CSA time event failed to start\n");
 208
 209         switch (te_data->vif->type) {
 210         case NL80211_IFTYPE_AP:
 211                 if (!notif->status)
 212                         mvmvif->csa_failed = true;
 213                 iwl_mvm_csa_noa_start(mvm);
 214                 break;
 215         case NL80211_IFTYPE_STATION:
 216                 if (!notif->status) {
 217                         iwl_mvm_connection_loss(mvm, vif,
 218                                                 "CSA TE failed to start");
 219                         break;
 220                 }
 221                 iwl_mvm_csa_client_absent(mvm, te_data->vif);
 222                 ieee80211_chswitch_done(te_data->vif, true);
 223                 break;
 224         default:
 225                 /* should never happen */
 226                 WARN_ON_ONCE(1);
 227                 break;
 228         }
 229
 230         /* we don't need it anymore */
 231         iwl_mvm_te_clear_data(mvm, te_data);
 232 }
 233
 234 static void iwl_mvm_te_check_trigger(struct iwl_mvm *mvm,
 235                                      struct iwl_time_event_notif *notif,
 236                                      struct iwl_mvm_time_event_data *te_data)
 237 {
 238         struct iwl_fw_dbg_trigger_tlv *trig;
 239         struct iwl_fw_dbg_trigger_time_event *te_trig;
 240         int i;
 241
 242         if (!iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_TIME_EVENT))
 243                 return;
 244
 245         trig = iwl_fw_dbg_get_trigger(mvm->fw, FW_DBG_TRIGGER_TIME_EVENT);
 246         te_trig = (void *)trig->data;
 247
 248         if (!iwl_fw_dbg_trigger_check_stop(mvm, te_data->vif, trig))
 249                 return;
 250
 251         for (i = 0; i < ARRAY_SIZE(te_trig->time_events); i++) {
 252                 u32 trig_te_id = le32_to_cpu(te_trig->time_events[i].id);
 253                 u32 trig_action_bitmap =
 254                         le32_to_cpu(te_trig->time_events[i].action_bitmap);
 255                 u32 trig_status_bitmap =
 256                         le32_to_cpu(te_trig->time_events[i].status_bitmap);
 257
 258                 if (trig_te_id != te_data->id ||
 259                     !(trig_action_bitmap & le32_to_cpu(notif->action)) ||
 260                     !(trig_status_bitmap & BIT(le32_to_cpu(notif->status))))
 261                         continue;
 262
 263                 iwl_mvm_fw_dbg_collect_trig(mvm, trig,
 264                                             "Time event %d Action 0x%x received status: %d",
 265                                             te_data->id,
 266                                             le32_to_cpu(notif->action),
 267                                             le32_to_cpu(notif->status));
 268                 break;
 269         }
 270 }
 271
 272 /*
 273  * Handles a FW notification for an event that is known to the driver.
 274  *
 275  * @mvm: the mvm component
 276  * @te_data: the time event data
 277  * @notif: the notification data corresponding the time event data.
 278  */
 279 static void iwl_mvm_te_handle_notif(struct iwl_mvm *mvm,
 280                                     struct iwl_mvm_time_event_data *te_data,
 281                                     struct iwl_time_event_notif *notif)
 282 {
 283         lockdep_assert_held(&mvm->time_event_lock);
 284
 285         IWL_DEBUG_TE(mvm, "Handle time event notif - UID = 0x%x action %d\n",
 286                      le32_to_cpu(notif->unique_id),
 287                      le32_to_cpu(notif->action));
 288
 289         iwl_mvm_te_check_trigger(mvm, notif, te_data);
 290
 291         /*
 292          * The FW sends the start/end time event notifications even for events
 293          * that it fails to schedule. This is indicated in the status field of
 294          * the notification. This happens in cases that the scheduler cannot
 295          * find a schedule that can handle the event (for example requesting a
 296          * P2P Device discoveribility, while there are other higher priority
 297          * events in the system).
 298          */
 299         if (!le32_to_cpu(notif->status)) {
 300                 const char *msg;
 301
 302                 if (notif->action & cpu_to_le32(TE_V2_NOTIF_HOST_EVENT_START))
 303                         msg = "Time Event start notification failure";
 304                 else
 305                         msg = "Time Event end notification failure";
 306
 307                 IWL_DEBUG_TE(mvm, "%s\n", msg);
 308
 309                 if (iwl_mvm_te_check_disconnect(mvm, te_data->vif, msg)) {
 310                         iwl_mvm_te_clear_data(mvm, te_data);
 311                         return;
 312                 }
 313         }
 314
 315         if (le32_to_cpu(notif->action) & TE_V2_NOTIF_HOST_EVENT_END) {
 316                 IWL_DEBUG_TE(mvm,
 317                              "TE ended - current time %lu, estimated end %lu\n",
 318                              jiffies, te_data->end_jiffies);
 319
 320                 switch (te_data->vif->type) {
 321                 case NL80211_IFTYPE_P2P_DEVICE:
 322                         ieee80211_remain_on_channel_expired(mvm->hw);
 323                         iwl_mvm_roc_finished(mvm);
 324                         break;
 325                 case NL80211_IFTYPE_STATION:
 326                         /*
 327                          * By now, we should have finished association
 328                          * and know the dtim period.
 329                          */
 330                         iwl_mvm_te_check_disconnect(mvm, te_data->vif,
 331                                 "No association and the time event is over already...");
 332                         break;
 333                 default:
 334                         break;
 335                 }
 336
 337                 iwl_mvm_te_clear_data(mvm, te_data);
 338         } else if (le32_to_cpu(notif->action) & TE_V2_NOTIF_HOST_EVENT_START) {
 339                 te_data->running = true;
 340                 te_data->end_jiffies = TU_TO_EXP_TIME(te_data->duration);
 341
 342                 if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) {
 343                         set_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status);
 344                         iwl_mvm_ref(mvm, IWL_MVM_REF_ROC);
 345                         ieee80211_ready_on_channel(mvm->hw);
 346                 } else if (te_data->id == TE_CHANNEL_SWITCH_PERIOD) {
 347                         iwl_mvm_te_handle_notify_csa(mvm, te_data, notif);
 348                 }
 349         } else {
 350                 IWL_WARN(mvm, "Got TE with unknown action\n");
 351         }
 352 }
 353
 354 /*
 355  * Handle A Aux ROC time event
 356  */
 357 static int iwl_mvm_aux_roc_te_handle_notif(struct iwl_mvm *mvm,
 358                                            struct iwl_time_event_notif *notif)
 359 {
 360         struct iwl_mvm_time_event_data *te_data, *tmp;
 361         bool aux_roc_te = false;
 362
 363         list_for_each_entry_safe(te_data, tmp, &mvm->aux_roc_te_list, list) {
 364                 if (le32_to_cpu(notif->unique_id) == te_data->uid) {
 365                         aux_roc_te = true;
 366                         break;
 367                 }
 368         }
 369         if (!aux_roc_te) /* Not a Aux ROC time event */
 370                 return -EINVAL;
 371
 372         iwl_mvm_te_check_trigger(mvm, notif, te_data);
 373
 374         IWL_DEBUG_TE(mvm,
 375                      "Aux ROC time event notification  - UID = 0x%x action %d (error = %d)\n",
 376                      le32_to_cpu(notif->unique_id),
 377                      le32_to_cpu(notif->action), le32_to_cpu(notif->status));
 378
 379         if (!le32_to_cpu(notif->status) ||
 380             le32_to_cpu(notif->action) == TE_V2_NOTIF_HOST_EVENT_END) {
 381                 /* End TE, notify mac80211 */
 382                 ieee80211_remain_on_channel_expired(mvm->hw);
 383                 iwl_mvm_roc_finished(mvm); /* flush aux queue */
 384                 list_del(&te_data->list); /* remove from list */
 385                 te_data->running = false;
 386                 te_data->vif = NULL;
 387                 te_data->uid = 0;
 388                 te_data->id = TE_MAX;
 389         } else if (le32_to_cpu(notif->action) == TE_V2_NOTIF_HOST_EVENT_START) {
 390                 set_bit(IWL_MVM_STATUS_ROC_AUX_RUNNING, &mvm->status);
 391                 te_data->running = true;
 392                 iwl_mvm_ref(mvm, IWL_MVM_REF_ROC_AUX);
 393                 ieee80211_ready_on_channel(mvm->hw); /* Start TE */
 394         } else {
 395                 IWL_DEBUG_TE(mvm,
 396                              "ERROR: Unknown Aux ROC Time Event (action = %d)\n",
 397                              le32_to_cpu(notif->action));
 398                 return -EINVAL;
 399         }
 400
 401         return 0;
 402 }
 403
 404 /*
 405  * The Rx handler for time event notifications
 406  */
 407 void iwl_mvm_rx_time_event_notif(struct iwl_mvm *mvm,
 408                                  struct iwl_rx_cmd_buffer *rxb)
 409 {
 410         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 411         struct iwl_time_event_notif *notif = (void *)pkt->data;
 412         struct iwl_mvm_time_event_data *te_data, *tmp;
 413
 414         IWL_DEBUG_TE(mvm, "Time event notification - UID = 0x%x action %d\n",
 415                      le32_to_cpu(notif->unique_id),
 416                      le32_to_cpu(notif->action));
 417
 418         spin_lock_bh(&mvm->time_event_lock);
 419         /* This time event is triggered for Aux ROC request */
 420         if (!iwl_mvm_aux_roc_te_handle_notif(mvm, notif))
 421                 goto unlock;
 422
 423         list_for_each_entry_safe(te_data, tmp, &mvm->time_event_list, list) {
 424                 if (le32_to_cpu(notif->unique_id) == te_data->uid)
 425                         iwl_mvm_te_handle_notif(mvm, te_data, notif);
 426         }
 427 unlock:
 428         spin_unlock_bh(&mvm->time_event_lock);
 429 }
 430
 431 static bool iwl_mvm_te_notif(struct iwl_notif_wait_data *notif_wait,
 432                              struct iwl_rx_packet *pkt, void *data)
 433 {
 434         struct iwl_mvm *mvm =
 435                 container_of(notif_wait, struct iwl_mvm, notif_wait);
 436         struct iwl_mvm_time_event_data *te_data = data;
 437         struct iwl_time_event_notif *resp;
 438         int resp_len = iwl_rx_packet_payload_len(pkt);
 439
 440         if (WARN_ON(pkt->hdr.cmd != TIME_EVENT_NOTIFICATION))
 441                 return true;
 442
 443         if (WARN_ON_ONCE(resp_len != sizeof(*resp))) {
 444                 IWL_ERR(mvm, "Invalid TIME_EVENT_NOTIFICATION response\n");
 445                 return true;
 446         }
 447
 448         resp = (void *)pkt->data;
 449
 450         /* te_data->uid is already set in the TIME_EVENT_CMD response */
 451         if (le32_to_cpu(resp->unique_id) != te_data->uid)
 452                 return false;
 453
 454         IWL_DEBUG_TE(mvm, "TIME_EVENT_NOTIFICATION response - UID = 0x%x\n",
 455                      te_data->uid);
 456         if (!resp->status)
 457                 IWL_ERR(mvm,
 458                         "TIME_EVENT_NOTIFICATION received but not executed\n");
 459
 460         return true;
 461 }
 462
 463 static bool iwl_mvm_time_event_response(struct iwl_notif_wait_data *notif_wait,
 464                                         struct iwl_rx_packet *pkt, void *data)
 465 {
 466         struct iwl_mvm *mvm =
 467                 container_of(notif_wait, struct iwl_mvm, notif_wait);
 468         struct iwl_mvm_time_event_data *te_data = data;
 469         struct iwl_time_event_resp *resp;
 470         int resp_len = iwl_rx_packet_payload_len(pkt);
 471
 472         if (WARN_ON(pkt->hdr.cmd != TIME_EVENT_CMD))
 473                 return true;
 474
 475         if (WARN_ON_ONCE(resp_len != sizeof(*resp))) {
 476                 IWL_ERR(mvm, "Invalid TIME_EVENT_CMD response\n");
 477                 return true;
 478         }
 479
 480         resp = (void *)pkt->data;
 481
 482         /* we should never get a response to another TIME_EVENT_CMD here */
 483         if (WARN_ON_ONCE(le32_to_cpu(resp->id) != te_data->id))
 484                 return false;
 485
 486         te_data->uid = le32_to_cpu(resp->unique_id);
 487         IWL_DEBUG_TE(mvm, "TIME_EVENT_CMD response - UID = 0x%x\n",
 488                      te_data->uid);
 489         return true;
 490 }
 491
 492 static int iwl_mvm_time_event_send_add(struct iwl_mvm *mvm,
 493                                        struct ieee80211_vif *vif,
 494                                        struct iwl_mvm_time_event_data *te_data,
 495                                        struct iwl_time_event_cmd *te_cmd)
 496 {
 497         static const u16 time_event_response[] = { TIME_EVENT_CMD };
 498         struct iwl_notification_wait wait_time_event;
 499         int ret;
 500
 501         lockdep_assert_held(&mvm->mutex);
 502
 503         IWL_DEBUG_TE(mvm, "Add new TE, duration %d TU\n",
 504                      le32_to_cpu(te_cmd->duration));
 505
 506         spin_lock_bh(&mvm->time_event_lock);
 507         if (WARN_ON(te_data->id != TE_MAX)) {
 508                 spin_unlock_bh(&mvm->time_event_lock);
 509                 return -EIO;
 510         }
 511         te_data->vif = vif;
 512         te_data->duration = le32_to_cpu(te_cmd->duration);
 513         te_data->id = le32_to_cpu(te_cmd->id);
 514         list_add_tail(&te_data->list, &mvm->time_event_list);
 515         spin_unlock_bh(&mvm->time_event_lock);
 516
 517         /*
 518          * Use a notification wait, which really just processes the
 519          * command response and doesn't wait for anything, in order
 520          * to be able to process the response and get the UID inside
 521          * the RX path. Using CMD_WANT_SKB doesn't work because it
 522          * stores the buffer and then wakes up this thread, by which
 523          * time another notification (that the time event started)
 524          * might already be processed unsuccessfully.
 525          */
 526         iwl_init_notification_wait(&mvm->notif_wait, &wait_time_event,
 527                                    time_event_response,
 528                                    ARRAY_SIZE(time_event_response),
 529                                    iwl_mvm_time_event_response, te_data);
 530
 531         ret = iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, 0,
 532                                             sizeof(*te_cmd), te_cmd);
 533         if (ret) {
 534                 IWL_ERR(mvm, "Couldn't send TIME_EVENT_CMD: %d\n", ret);
 535                 iwl_remove_notification(&mvm->notif_wait, &wait_time_event);
 536                 goto out_clear_te;
 537         }
 538
 539         /* No need to wait for anything, so just pass 1 (0 isn't valid) */
 540         ret = iwl_wait_notification(&mvm->notif_wait, &wait_time_event, 1);
 541         /* should never fail */
 542         WARN_ON_ONCE(ret);
 543
 544         if (ret) {
 545  out_clear_te:
 546                 spin_lock_bh(&mvm->time_event_lock);
 547                 iwl_mvm_te_clear_data(mvm, te_data);
 548                 spin_unlock_bh(&mvm->time_event_lock);
 549         }
 550         return ret;
 551 }
 552
 553 void iwl_mvm_protect_session(struct iwl_mvm *mvm,
 554                              struct ieee80211_vif *vif,
 555                              u32 duration, u32 min_duration,
 556                              u32 max_delay, bool wait_for_notif)
 557 {
 558         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 559         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 560         const u16 te_notif_response[] = { TIME_EVENT_NOTIFICATION };
 561         struct iwl_notification_wait wait_te_notif;
 562         struct iwl_time_event_cmd time_cmd = {};
 563
 564         lockdep_assert_held(&mvm->mutex);
 565
 566         if (te_data->running &&
 567             time_after(te_data->end_jiffies, TU_TO_EXP_TIME(min_duration))) {
 568                 IWL_DEBUG_TE(mvm, "We have enough time in the current TE: %u\n",
 569                              jiffies_to_msecs(te_data->end_jiffies - jiffies));
 570                 return;
 571         }
 572
 573         if (te_data->running) {
 574                 IWL_DEBUG_TE(mvm, "extend 0x%x: only %u ms left\n",
 575                              te_data->uid,
 576                              jiffies_to_msecs(te_data->end_jiffies - jiffies));
 577                 /*
 578                  * we don't have enough time
 579                  * cancel the current TE and issue a new one
 580                  * Of course it would be better to remove the old one only
 581                  * when the new one is added, but we don't care if we are off
 582                  * channel for a bit. All we need to do, is not to return
 583                  * before we actually begin to be on the channel.
 584                  */
 585                 iwl_mvm_stop_session_protection(mvm, vif);
 586         }
 587
 588         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
 589         time_cmd.id_and_color =
 590                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 591         time_cmd.id = cpu_to_le32(TE_BSS_STA_AGGRESSIVE_ASSOC);
 592
 593         time_cmd.apply_time = cpu_to_le32(0);
 594
 595         time_cmd.max_frags = TE_V2_FRAG_NONE;
 596         time_cmd.max_delay = cpu_to_le32(max_delay);
 597         /* TODO: why do we need to interval = bi if it is not periodic? */
 598         time_cmd.interval = cpu_to_le32(1);
 599         time_cmd.duration = cpu_to_le32(duration);
 600         time_cmd.repeat = 1;
 601         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
 602                                       TE_V2_NOTIF_HOST_EVENT_END |
 603                                       T2_V2_START_IMMEDIATELY);
 604
 605         if (!wait_for_notif) {
 606                 iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
 607                 return;
 608         }
 609
 610         /*
 611          * Create notification_wait for the TIME_EVENT_NOTIFICATION to use
 612          * right after we send the time event
 613          */
 614         iwl_init_notification_wait(&mvm->notif_wait, &wait_te_notif,
 615                                    te_notif_response,
 616                                    ARRAY_SIZE(te_notif_response),
 617                                    iwl_mvm_te_notif, te_data);
 618
 619         /* If TE was sent OK - wait for the notification that started */
 620         if (iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd)) {
 621                 IWL_ERR(mvm, "Failed to add TE to protect session\n");
 622                 iwl_remove_notification(&mvm->notif_wait, &wait_te_notif);
 623         } else if (iwl_wait_notification(&mvm->notif_wait, &wait_te_notif,
 624                                          TU_TO_JIFFIES(max_delay))) {
 625                 IWL_ERR(mvm, "Failed to protect session until TE\n");
 626         }
 627 }
 628
 629 static bool __iwl_mvm_remove_time_event(struct iwl_mvm *mvm,
 630                                         struct iwl_mvm_time_event_data *te_data,
 631                                         u32 *uid)
 632 {
 633         u32 id;
 634
 635         /*
 636          * It is possible that by the time we got to this point the time
 637          * event was already removed.
 638          */
 639         spin_lock_bh(&mvm->time_event_lock);
 640
 641         /* Save time event uid before clearing its data */
 642         *uid = te_data->uid;
 643         id = te_data->id;
 644
 645         /*
 646          * The clear_data function handles time events that were already removed
 647          */
 648         iwl_mvm_te_clear_data(mvm, te_data);
 649         spin_unlock_bh(&mvm->time_event_lock);
 650
 651         /*
 652          * It is possible that by the time we try to remove it, the time event
 653          * has already ended and removed. In such a case there is no need to
 654          * send a removal command.
 655          */
 656         if (id == TE_MAX) {
 657                 IWL_DEBUG_TE(mvm, "TE 0x%x has already ended\n", *uid);
 658                 return false;
 659         }
 660
 661         return true;
 662 }
 663
 664 /*
 665  * Explicit request to remove a aux roc time event. The removal of a time
 666  * event needs to be synchronized with the flow of a time event's end
 667  * notification, which also removes the time event from the op mode
 668  * data structures.
 669  */
 670 static void iwl_mvm_remove_aux_roc_te(struct iwl_mvm *mvm,
 671                                       struct iwl_mvm_vif *mvmvif,
 672                                       struct iwl_mvm_time_event_data *te_data)
 673 {
 674         struct iwl_hs20_roc_req aux_cmd = {};
 675         u32 uid;
 676         int ret;
 677
 678         if (!__iwl_mvm_remove_time_event(mvm, te_data, &uid))
 679                 return;
 680
 681         aux_cmd.event_unique_id = cpu_to_le32(uid);
 682         aux_cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE);
 683         aux_cmd.id_and_color =
 684                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 685         IWL_DEBUG_TE(mvm, "Removing BSS AUX ROC TE 0x%x\n",
 686                      le32_to_cpu(aux_cmd.event_unique_id));
 687         ret = iwl_mvm_send_cmd_pdu(mvm, HOT_SPOT_CMD, 0,
 688                                    sizeof(aux_cmd), &aux_cmd);
 689
 690         if (WARN_ON(ret))
 691                 return;
 692 }
 693
 694 /*
 695  * Explicit request to remove a time event. The removal of a time event needs to
 696  * be synchronized with the flow of a time event's end notification, which also
 697  * removes the time event from the op mode data structures.
 698  */
 699 void iwl_mvm_remove_time_event(struct iwl_mvm *mvm,
 700                                struct iwl_mvm_vif *mvmvif,
 701                                struct iwl_mvm_time_event_data *te_data)
 702 {
 703         struct iwl_time_event_cmd time_cmd = {};
 704         u32 uid;
 705         int ret;
 706
 707         if (!__iwl_mvm_remove_time_event(mvm, te_data, &uid))
 708                 return;
 709
 710         /* When we remove a TE, the UID is to be set in the id field */
 711         time_cmd.id = cpu_to_le32(uid);
 712         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE);
 713         time_cmd.id_and_color =
 714                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 715
 716         IWL_DEBUG_TE(mvm, "Removing TE 0x%x\n", le32_to_cpu(time_cmd.id));
 717         ret = iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, 0,
 718                                    sizeof(time_cmd), &time_cmd);
 719         if (WARN_ON(ret))
 720                 return;
 721 }
 722
 723 void iwl_mvm_stop_session_protection(struct iwl_mvm *mvm,
 724                                      struct ieee80211_vif *vif)
 725 {
 726         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 727         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 728
 729         lockdep_assert_held(&mvm->mutex);
 730         iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
 731 }
 732
 733 int iwl_mvm_start_p2p_roc(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 734                           int duration, enum ieee80211_roc_type type)
 735 {
 736         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 737         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 738         struct iwl_time_event_cmd time_cmd = {};
 739
 740         lockdep_assert_held(&mvm->mutex);
 741         if (te_data->running) {
 742                 IWL_WARN(mvm, "P2P_DEVICE remain on channel already running\n");
 743                 return -EBUSY;
 744         }
 745
 746         /*
 747          * Flush the done work, just in case it's still pending, so that
 748          * the work it does can complete and we can accept new frames.
 749          */
 750         flush_work(&mvm->roc_done_wk);
 751
 752         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
 753         time_cmd.id_and_color =
 754                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 755
 756         switch (type) {
 757         case IEEE80211_ROC_TYPE_NORMAL:
 758                 time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_NORMAL);
 759                 break;
 760         case IEEE80211_ROC_TYPE_MGMT_TX:
 761                 time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_MGMT_TX);
 762                 break;
 763         default:
 764                 WARN_ONCE(1, "Got an invalid ROC type\n");
 765                 return -EINVAL;
 766         }
 767
 768         time_cmd.apply_time = cpu_to_le32(0);
 769         time_cmd.interval = cpu_to_le32(1);
 770
 771         /*
 772          * The P2P Device TEs can have lower priority than other events
 773          * that are being scheduled by the driver/fw, and thus it might not be
 774          * scheduled. To improve the chances of it being scheduled, allow them
 775          * to be fragmented, and in addition allow them to be delayed.
 776          */
 777         time_cmd.max_frags = min(MSEC_TO_TU(duration)/50, TE_V2_FRAG_ENDLESS);
 778         time_cmd.max_delay = cpu_to_le32(MSEC_TO_TU(duration/2));
 779         time_cmd.duration = cpu_to_le32(MSEC_TO_TU(duration));
 780         time_cmd.repeat = 1;
 781         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
 782                                       TE_V2_NOTIF_HOST_EVENT_END |
 783                                       T2_V2_START_IMMEDIATELY);
 784
 785         return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
 786 }
 787
 788 static struct iwl_mvm_time_event_data *iwl_mvm_get_roc_te(struct iwl_mvm *mvm)
 789 {
 790         struct iwl_mvm_time_event_data *te_data;
 791
 792         lockdep_assert_held(&mvm->mutex);
 793
 794         spin_lock_bh(&mvm->time_event_lock);
 795
 796         /*
 797          * Iterate over the list of time events and find the time event that is
 798          * associated with a P2P_DEVICE interface.
 799          * This assumes that a P2P_DEVICE interface can have only a single time
 800          * event at any given time and this time event coresponds to a ROC
 801          * request
 802          */
 803         list_for_each_entry(te_data, &mvm->time_event_list, list) {
 804                 if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE)
 805                         goto out;
 806         }
 807
 808         /* There can only be at most one AUX ROC time event, we just use the
 809          * list to simplify/unify code. Remove it if it exists.
 810          */
 811         te_data = list_first_entry_or_null(&mvm->aux_roc_te_list,
 812                                            struct iwl_mvm_time_event_data,
 813                                            list);
 814 out:
 815         spin_unlock_bh(&mvm->time_event_lock);
 816         return te_data;
 817 }
 818
 819 void iwl_mvm_cleanup_roc_te(struct iwl_mvm *mvm)
 820 {
 821         struct iwl_mvm_time_event_data *te_data;
 822         u32 uid;
 823
 824         te_data = iwl_mvm_get_roc_te(mvm);
 825         if (te_data)
 826                 __iwl_mvm_remove_time_event(mvm, te_data, &uid);
 827 }
 828
 829 void iwl_mvm_stop_roc(struct iwl_mvm *mvm)
 830 {
 831         struct iwl_mvm_vif *mvmvif;
 832         struct iwl_mvm_time_event_data *te_data;
 833
 834         te_data = iwl_mvm_get_roc_te(mvm);
 835         if (!te_data) {
 836                 IWL_WARN(mvm, "No remain on channel event\n");
 837                 return;
 838         }
 839
 840         mvmvif = iwl_mvm_vif_from_mac80211(te_data->vif);
 841
 842         if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE)
 843                 iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
 844         else
 845                 iwl_mvm_remove_aux_roc_te(mvm, mvmvif, te_data);
 846
 847         iwl_mvm_roc_finished(mvm);
 848 }
 849
 850 int iwl_mvm_schedule_csa_period(struct iwl_mvm *mvm,
 851                                 struct ieee80211_vif *vif,
 852                                 u32 duration, u32 apply_time)
 853 {
 854         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 855         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 856         struct iwl_time_event_cmd time_cmd = {};
 857
 858         lockdep_assert_held(&mvm->mutex);
 859
 860         if (te_data->running) {
 861                 IWL_DEBUG_TE(mvm, "CS period is already scheduled\n");
 862                 return -EBUSY;
 863         }
 864
 865         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
 866         time_cmd.id_and_color =
 867                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 868         time_cmd.id = cpu_to_le32(TE_CHANNEL_SWITCH_PERIOD);
 869         time_cmd.apply_time = cpu_to_le32(apply_time);
 870         time_cmd.max_frags = TE_V2_FRAG_NONE;
 871         time_cmd.duration = cpu_to_le32(duration);
 872         time_cmd.repeat = 1;
 873         time_cmd.interval = cpu_to_le32(1);
 874         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
 875                                       TE_V2_ABSENCE);
 876
 877         return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
 878 }