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 - 2019 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.
  16  *
  17  * This program is distributed in the hope that it will be useful, but
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  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20  * General Public License for more details.
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  22  * The full GNU General Public License is included in this distribution
  23  * in the file called COPYING.
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  27  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  28  *
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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 - 2019 Intel Corporation
  35  * All rights reserved.
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  38  * modification, are permitted provided that the following conditions
  39  * are met:
  40  *
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  42  *    notice, this list of conditions and the following disclaimer.
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  44  *    notice, this list of conditions and the following disclaimer in
  45  *    the documentation and/or other materials provided with the
  46  *    distribution.
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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
  59  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  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 || !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                 cancel_delayed_work(&mvmvif->csa_work);
 238                 ieee80211_chswitch_done(te_data->vif, true);
 239                 break;
 240         default:
 241                 /* should never happen */
 242                 WARN_ON_ONCE(1);
 243                 break;
 244         }
 245
 246         /* we don't need it anymore */
 247         iwl_mvm_te_clear_data(mvm, te_data);
 248 }
 249
 250 static void iwl_mvm_te_check_trigger(struct iwl_mvm *mvm,
 251                                      struct iwl_time_event_notif *notif,
 252                                      struct iwl_mvm_time_event_data *te_data)
 253 {
 254         struct iwl_fw_dbg_trigger_tlv *trig;
 255         struct iwl_fw_dbg_trigger_time_event *te_trig;
 256         int i;
 257
 258         trig = iwl_fw_dbg_trigger_on(&mvm->fwrt,
 259                                      ieee80211_vif_to_wdev(te_data->vif),
 260                                      FW_DBG_TRIGGER_TIME_EVENT);
 261         if (!trig)
 262                 return;
 263
 264         te_trig = (void *)trig->data;
 265
 266         for (i = 0; i < ARRAY_SIZE(te_trig->time_events); i++) {
 267                 u32 trig_te_id = le32_to_cpu(te_trig->time_events[i].id);
 268                 u32 trig_action_bitmap =
 269                         le32_to_cpu(te_trig->time_events[i].action_bitmap);
 270                 u32 trig_status_bitmap =
 271                         le32_to_cpu(te_trig->time_events[i].status_bitmap);
 272
 273                 if (trig_te_id != te_data->id ||
 274                     !(trig_action_bitmap & le32_to_cpu(notif->action)) ||
 275                     !(trig_status_bitmap & BIT(le32_to_cpu(notif->status))))
 276                         continue;
 277
 278                 iwl_fw_dbg_collect_trig(&mvm->fwrt, trig,
 279                                         "Time event %d Action 0x%x received status: %d",
 280                                         te_data->id,
 281                                         le32_to_cpu(notif->action),
 282                                         le32_to_cpu(notif->status));
 283                 break;
 284         }
 285 }
 286
 287 /*
 288  * Handles a FW notification for an event that is known to the driver.
 289  *
 290  * @mvm: the mvm component
 291  * @te_data: the time event data
 292  * @notif: the notification data corresponding the time event data.
 293  */
 294 static void iwl_mvm_te_handle_notif(struct iwl_mvm *mvm,
 295                                     struct iwl_mvm_time_event_data *te_data,
 296                                     struct iwl_time_event_notif *notif)
 297 {
 298         lockdep_assert_held(&mvm->time_event_lock);
 299
 300         IWL_DEBUG_TE(mvm, "Handle time event notif - UID = 0x%x action %d\n",
 301                      le32_to_cpu(notif->unique_id),
 302                      le32_to_cpu(notif->action));
 303
 304         iwl_mvm_te_check_trigger(mvm, notif, te_data);
 305
 306         /*
 307          * The FW sends the start/end time event notifications even for events
 308          * that it fails to schedule. This is indicated in the status field of
 309          * the notification. This happens in cases that the scheduler cannot
 310          * find a schedule that can handle the event (for example requesting a
 311          * P2P Device discoveribility, while there are other higher priority
 312          * events in the system).
 313          */
 314         if (!le32_to_cpu(notif->status)) {
 315                 const char *msg;
 316
 317                 if (notif->action & cpu_to_le32(TE_V2_NOTIF_HOST_EVENT_START))
 318                         msg = "Time Event start notification failure";
 319                 else
 320                         msg = "Time Event end notification failure";
 321
 322                 IWL_DEBUG_TE(mvm, "%s\n", msg);
 323
 324                 if (iwl_mvm_te_check_disconnect(mvm, te_data->vif, msg)) {
 325                         iwl_mvm_te_clear_data(mvm, te_data);
 326                         return;
 327                 }
 328         }
 329
 330         if (le32_to_cpu(notif->action) & TE_V2_NOTIF_HOST_EVENT_END) {
 331                 IWL_DEBUG_TE(mvm,
 332                              "TE ended - current time %lu, estimated end %lu\n",
 333                              jiffies, te_data->end_jiffies);
 334
 335                 switch (te_data->vif->type) {
 336                 case NL80211_IFTYPE_P2P_DEVICE:
 337                         ieee80211_remain_on_channel_expired(mvm->hw);
 338                         set_bit(IWL_MVM_STATUS_NEED_FLUSH_P2P, &mvm->status);
 339                         iwl_mvm_roc_finished(mvm);
 340                         break;
 341                 case NL80211_IFTYPE_STATION:
 342                         /*
 343                          * By now, we should have finished association
 344                          * and know the dtim period.
 345                          */
 346                         iwl_mvm_te_check_disconnect(mvm, te_data->vif,
 347                                 "No beacon heard and the time event is over already...");
 348                         break;
 349                 default:
 350                         break;
 351                 }
 352
 353                 iwl_mvm_te_clear_data(mvm, te_data);
 354         } else if (le32_to_cpu(notif->action) & TE_V2_NOTIF_HOST_EVENT_START) {
 355                 te_data->running = true;
 356                 te_data->end_jiffies = TU_TO_EXP_TIME(te_data->duration);
 357
 358                 if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) {
 359                         set_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status);
 360                         iwl_mvm_ref(mvm, IWL_MVM_REF_ROC);
 361                         ieee80211_ready_on_channel(mvm->hw);
 362                 } else if (te_data->id == TE_CHANNEL_SWITCH_PERIOD) {
 363                         iwl_mvm_te_handle_notify_csa(mvm, te_data, notif);
 364                 }
 365         } else {
 366                 IWL_WARN(mvm, "Got TE with unknown action\n");
 367         }
 368 }
 369
 370 /*
 371  * Handle A Aux ROC time event
 372  */
 373 static int iwl_mvm_aux_roc_te_handle_notif(struct iwl_mvm *mvm,
 374                                            struct iwl_time_event_notif *notif)
 375 {
 376         struct iwl_mvm_time_event_data *te_data, *tmp;
 377         bool aux_roc_te = false;
 378
 379         list_for_each_entry_safe(te_data, tmp, &mvm->aux_roc_te_list, list) {
 380                 if (le32_to_cpu(notif->unique_id) == te_data->uid) {
 381                         aux_roc_te = true;
 382                         break;
 383                 }
 384         }
 385         if (!aux_roc_te) /* Not a Aux ROC time event */
 386                 return -EINVAL;
 387
 388         iwl_mvm_te_check_trigger(mvm, notif, te_data);
 389
 390         IWL_DEBUG_TE(mvm,
 391                      "Aux ROC time event notification  - UID = 0x%x action %d (error = %d)\n",
 392                      le32_to_cpu(notif->unique_id),
 393                      le32_to_cpu(notif->action), le32_to_cpu(notif->status));
 394
 395         if (!le32_to_cpu(notif->status) ||
 396             le32_to_cpu(notif->action) == TE_V2_NOTIF_HOST_EVENT_END) {
 397                 /* End TE, notify mac80211 */
 398                 ieee80211_remain_on_channel_expired(mvm->hw);
 399                 iwl_mvm_roc_finished(mvm); /* flush aux queue */
 400                 list_del(&te_data->list); /* remove from list */
 401                 te_data->running = false;
 402                 te_data->vif = NULL;
 403                 te_data->uid = 0;
 404                 te_data->id = TE_MAX;
 405         } else if (le32_to_cpu(notif->action) == TE_V2_NOTIF_HOST_EVENT_START) {
 406                 set_bit(IWL_MVM_STATUS_ROC_AUX_RUNNING, &mvm->status);
 407                 te_data->running = true;
 408                 iwl_mvm_ref(mvm, IWL_MVM_REF_ROC_AUX);
 409                 ieee80211_ready_on_channel(mvm->hw); /* Start TE */
 410         } else {
 411                 IWL_DEBUG_TE(mvm,
 412                              "ERROR: Unknown Aux ROC Time Event (action = %d)\n",
 413                              le32_to_cpu(notif->action));
 414                 return -EINVAL;
 415         }
 416
 417         return 0;
 418 }
 419
 420 /*
 421  * The Rx handler for time event notifications
 422  */
 423 void iwl_mvm_rx_time_event_notif(struct iwl_mvm *mvm,
 424                                  struct iwl_rx_cmd_buffer *rxb)
 425 {
 426         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 427         struct iwl_time_event_notif *notif = (void *)pkt->data;
 428         struct iwl_mvm_time_event_data *te_data, *tmp;
 429
 430         IWL_DEBUG_TE(mvm, "Time event notification - UID = 0x%x action %d\n",
 431                      le32_to_cpu(notif->unique_id),
 432                      le32_to_cpu(notif->action));
 433
 434         spin_lock_bh(&mvm->time_event_lock);
 435         /* This time event is triggered for Aux ROC request */
 436         if (!iwl_mvm_aux_roc_te_handle_notif(mvm, notif))
 437                 goto unlock;
 438
 439         list_for_each_entry_safe(te_data, tmp, &mvm->time_event_list, list) {
 440                 if (le32_to_cpu(notif->unique_id) == te_data->uid)
 441                         iwl_mvm_te_handle_notif(mvm, te_data, notif);
 442         }
 443 unlock:
 444         spin_unlock_bh(&mvm->time_event_lock);
 445 }
 446
 447 static bool iwl_mvm_te_notif(struct iwl_notif_wait_data *notif_wait,
 448                              struct iwl_rx_packet *pkt, void *data)
 449 {
 450         struct iwl_mvm *mvm =
 451                 container_of(notif_wait, struct iwl_mvm, notif_wait);
 452         struct iwl_mvm_time_event_data *te_data = data;
 453         struct iwl_time_event_notif *resp;
 454         int resp_len = iwl_rx_packet_payload_len(pkt);
 455
 456         if (WARN_ON(pkt->hdr.cmd != TIME_EVENT_NOTIFICATION))
 457                 return true;
 458
 459         if (WARN_ON_ONCE(resp_len != sizeof(*resp))) {
 460                 IWL_ERR(mvm, "Invalid TIME_EVENT_NOTIFICATION response\n");
 461                 return true;
 462         }
 463
 464         resp = (void *)pkt->data;
 465
 466         /* te_data->uid is already set in the TIME_EVENT_CMD response */
 467         if (le32_to_cpu(resp->unique_id) != te_data->uid)
 468                 return false;
 469
 470         IWL_DEBUG_TE(mvm, "TIME_EVENT_NOTIFICATION response - UID = 0x%x\n",
 471                      te_data->uid);
 472         if (!resp->status)
 473                 IWL_ERR(mvm,
 474                         "TIME_EVENT_NOTIFICATION received but not executed\n");
 475
 476         return true;
 477 }
 478
 479 static bool iwl_mvm_time_event_response(struct iwl_notif_wait_data *notif_wait,
 480                                         struct iwl_rx_packet *pkt, void *data)
 481 {
 482         struct iwl_mvm *mvm =
 483                 container_of(notif_wait, struct iwl_mvm, notif_wait);
 484         struct iwl_mvm_time_event_data *te_data = data;
 485         struct iwl_time_event_resp *resp;
 486         int resp_len = iwl_rx_packet_payload_len(pkt);
 487
 488         if (WARN_ON(pkt->hdr.cmd != TIME_EVENT_CMD))
 489                 return true;
 490
 491         if (WARN_ON_ONCE(resp_len != sizeof(*resp))) {
 492                 IWL_ERR(mvm, "Invalid TIME_EVENT_CMD response\n");
 493                 return true;
 494         }
 495
 496         resp = (void *)pkt->data;
 497
 498         /* we should never get a response to another TIME_EVENT_CMD here */
 499         if (WARN_ON_ONCE(le32_to_cpu(resp->id) != te_data->id))
 500                 return false;
 501
 502         te_data->uid = le32_to_cpu(resp->unique_id);
 503         IWL_DEBUG_TE(mvm, "TIME_EVENT_CMD response - UID = 0x%x\n",
 504                      te_data->uid);
 505         return true;
 506 }
 507
 508 static int iwl_mvm_time_event_send_add(struct iwl_mvm *mvm,
 509                                        struct ieee80211_vif *vif,
 510                                        struct iwl_mvm_time_event_data *te_data,
 511                                        struct iwl_time_event_cmd *te_cmd)
 512 {
 513         static const u16 time_event_response[] = { TIME_EVENT_CMD };
 514         struct iwl_notification_wait wait_time_event;
 515         int ret;
 516
 517         lockdep_assert_held(&mvm->mutex);
 518
 519         IWL_DEBUG_TE(mvm, "Add new TE, duration %d TU\n",
 520                      le32_to_cpu(te_cmd->duration));
 521
 522         spin_lock_bh(&mvm->time_event_lock);
 523         if (WARN_ON(te_data->id != TE_MAX)) {
 524                 spin_unlock_bh(&mvm->time_event_lock);
 525                 return -EIO;
 526         }
 527         te_data->vif = vif;
 528         te_data->duration = le32_to_cpu(te_cmd->duration);
 529         te_data->id = le32_to_cpu(te_cmd->id);
 530         list_add_tail(&te_data->list, &mvm->time_event_list);
 531         spin_unlock_bh(&mvm->time_event_lock);
 532
 533         /*
 534          * Use a notification wait, which really just processes the
 535          * command response and doesn't wait for anything, in order
 536          * to be able to process the response and get the UID inside
 537          * the RX path. Using CMD_WANT_SKB doesn't work because it
 538          * stores the buffer and then wakes up this thread, by which
 539          * time another notification (that the time event started)
 540          * might already be processed unsuccessfully.
 541          */
 542         iwl_init_notification_wait(&mvm->notif_wait, &wait_time_event,
 543                                    time_event_response,
 544                                    ARRAY_SIZE(time_event_response),
 545                                    iwl_mvm_time_event_response, te_data);
 546
 547         ret = iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, 0,
 548                                             sizeof(*te_cmd), te_cmd);
 549         if (ret) {
 550                 IWL_ERR(mvm, "Couldn't send TIME_EVENT_CMD: %d\n", ret);
 551                 iwl_remove_notification(&mvm->notif_wait, &wait_time_event);
 552                 goto out_clear_te;
 553         }
 554
 555         /* No need to wait for anything, so just pass 1 (0 isn't valid) */
 556         ret = iwl_wait_notification(&mvm->notif_wait, &wait_time_event, 1);
 557         /* should never fail */
 558         WARN_ON_ONCE(ret);
 559
 560         if (ret) {
 561  out_clear_te:
 562                 spin_lock_bh(&mvm->time_event_lock);
 563                 iwl_mvm_te_clear_data(mvm, te_data);
 564                 spin_unlock_bh(&mvm->time_event_lock);
 565         }
 566         return ret;
 567 }
 568
 569 void iwl_mvm_protect_session(struct iwl_mvm *mvm,
 570                              struct ieee80211_vif *vif,
 571                              u32 duration, u32 min_duration,
 572                              u32 max_delay, bool wait_for_notif)
 573 {
 574         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 575         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 576         const u16 te_notif_response[] = { TIME_EVENT_NOTIFICATION };
 577         struct iwl_notification_wait wait_te_notif;
 578         struct iwl_time_event_cmd time_cmd = {};
 579
 580         lockdep_assert_held(&mvm->mutex);
 581
 582         if (te_data->running &&
 583             time_after(te_data->end_jiffies, TU_TO_EXP_TIME(min_duration))) {
 584                 IWL_DEBUG_TE(mvm, "We have enough time in the current TE: %u\n",
 585                              jiffies_to_msecs(te_data->end_jiffies - jiffies));
 586                 return;
 587         }
 588
 589         if (te_data->running) {
 590                 IWL_DEBUG_TE(mvm, "extend 0x%x: only %u ms left\n",
 591                              te_data->uid,
 592                              jiffies_to_msecs(te_data->end_jiffies - jiffies));
 593                 /*
 594                  * we don't have enough time
 595                  * cancel the current TE and issue a new one
 596                  * Of course it would be better to remove the old one only
 597                  * when the new one is added, but we don't care if we are off
 598                  * channel for a bit. All we need to do, is not to return
 599                  * before we actually begin to be on the channel.
 600                  */
 601                 iwl_mvm_stop_session_protection(mvm, vif);
 602         }
 603
 604         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
 605         time_cmd.id_and_color =
 606                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 607         time_cmd.id = cpu_to_le32(TE_BSS_STA_AGGRESSIVE_ASSOC);
 608
 609         time_cmd.apply_time = cpu_to_le32(0);
 610
 611         time_cmd.max_frags = TE_V2_FRAG_NONE;
 612         time_cmd.max_delay = cpu_to_le32(max_delay);
 613         /* TODO: why do we need to interval = bi if it is not periodic? */
 614         time_cmd.interval = cpu_to_le32(1);
 615         time_cmd.duration = cpu_to_le32(duration);
 616         time_cmd.repeat = 1;
 617         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
 618                                       TE_V2_NOTIF_HOST_EVENT_END |
 619                                       TE_V2_START_IMMEDIATELY);
 620
 621         if (!wait_for_notif) {
 622                 iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
 623                 return;
 624         }
 625
 626         /*
 627          * Create notification_wait for the TIME_EVENT_NOTIFICATION to use
 628          * right after we send the time event
 629          */
 630         iwl_init_notification_wait(&mvm->notif_wait, &wait_te_notif,
 631                                    te_notif_response,
 632                                    ARRAY_SIZE(te_notif_response),
 633                                    iwl_mvm_te_notif, te_data);
 634
 635         /* If TE was sent OK - wait for the notification that started */
 636         if (iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd)) {
 637                 IWL_ERR(mvm, "Failed to add TE to protect session\n");
 638                 iwl_remove_notification(&mvm->notif_wait, &wait_te_notif);
 639         } else if (iwl_wait_notification(&mvm->notif_wait, &wait_te_notif,
 640                                          TU_TO_JIFFIES(max_delay))) {
 641                 IWL_ERR(mvm, "Failed to protect session until TE\n");
 642         }
 643 }
 644
 645 static bool __iwl_mvm_remove_time_event(struct iwl_mvm *mvm,
 646                                         struct iwl_mvm_time_event_data *te_data,
 647                                         u32 *uid)
 648 {
 649         u32 id;
 650
 651         /*
 652          * It is possible that by the time we got to this point the time
 653          * event was already removed.
 654          */
 655         spin_lock_bh(&mvm->time_event_lock);
 656
 657         /* Save time event uid before clearing its data */
 658         *uid = te_data->uid;
 659         id = te_data->id;
 660
 661         /*
 662          * The clear_data function handles time events that were already removed
 663          */
 664         iwl_mvm_te_clear_data(mvm, te_data);
 665         spin_unlock_bh(&mvm->time_event_lock);
 666
 667         /*
 668          * It is possible that by the time we try to remove it, the time event
 669          * has already ended and removed. In such a case there is no need to
 670          * send a removal command.
 671          */
 672         if (id == TE_MAX) {
 673                 IWL_DEBUG_TE(mvm, "TE 0x%x has already ended\n", *uid);
 674                 return false;
 675         }
 676
 677         return true;
 678 }
 679
 680 /*
 681  * Explicit request to remove a aux roc time event. The removal of a time
 682  * event needs to be synchronized with the flow of a time event's end
 683  * notification, which also removes the time event from the op mode
 684  * data structures.
 685  */
 686 static void iwl_mvm_remove_aux_roc_te(struct iwl_mvm *mvm,
 687                                       struct iwl_mvm_vif *mvmvif,
 688                                       struct iwl_mvm_time_event_data *te_data)
 689 {
 690         struct iwl_hs20_roc_req aux_cmd = {};
 691         u16 len = sizeof(aux_cmd) - iwl_mvm_chan_info_padding(mvm);
 692
 693         u32 uid;
 694         int ret;
 695
 696         if (!__iwl_mvm_remove_time_event(mvm, te_data, &uid))
 697                 return;
 698
 699         aux_cmd.event_unique_id = cpu_to_le32(uid);
 700         aux_cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE);
 701         aux_cmd.id_and_color =
 702                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 703         IWL_DEBUG_TE(mvm, "Removing BSS AUX ROC TE 0x%x\n",
 704                      le32_to_cpu(aux_cmd.event_unique_id));
 705         ret = iwl_mvm_send_cmd_pdu(mvm, HOT_SPOT_CMD, 0,
 706                                    len, &aux_cmd);
 707
 708         if (WARN_ON(ret))
 709                 return;
 710 }
 711
 712 /*
 713  * Explicit request to remove a time event. The removal of a time event needs to
 714  * be synchronized with the flow of a time event's end notification, which also
 715  * removes the time event from the op mode data structures.
 716  */
 717 void iwl_mvm_remove_time_event(struct iwl_mvm *mvm,
 718                                struct iwl_mvm_vif *mvmvif,
 719                                struct iwl_mvm_time_event_data *te_data)
 720 {
 721         struct iwl_time_event_cmd time_cmd = {};
 722         u32 uid;
 723         int ret;
 724
 725         if (!__iwl_mvm_remove_time_event(mvm, te_data, &uid))
 726                 return;
 727
 728         /* When we remove a TE, the UID is to be set in the id field */
 729         time_cmd.id = cpu_to_le32(uid);
 730         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE);
 731         time_cmd.id_and_color =
 732                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 733
 734         IWL_DEBUG_TE(mvm, "Removing TE 0x%x\n", le32_to_cpu(time_cmd.id));
 735         ret = iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, 0,
 736                                    sizeof(time_cmd), &time_cmd);
 737         if (WARN_ON(ret))
 738                 return;
 739 }
 740
 741 void iwl_mvm_stop_session_protection(struct iwl_mvm *mvm,
 742                                      struct ieee80211_vif *vif)
 743 {
 744         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 745         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 746         u32 id;
 747
 748         lockdep_assert_held(&mvm->mutex);
 749
 750         spin_lock_bh(&mvm->time_event_lock);
 751         id = te_data->id;
 752         spin_unlock_bh(&mvm->time_event_lock);
 753
 754         if (id != TE_BSS_STA_AGGRESSIVE_ASSOC) {
 755                 IWL_DEBUG_TE(mvm,
 756                              "don't remove TE with id=%u (not session protection)\n",
 757                              id);
 758                 return;
 759         }
 760
 761         iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
 762 }
 763
 764 int iwl_mvm_start_p2p_roc(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 765                           int duration, enum ieee80211_roc_type type)
 766 {
 767         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 768         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 769         struct iwl_time_event_cmd time_cmd = {};
 770
 771         lockdep_assert_held(&mvm->mutex);
 772         if (te_data->running) {
 773                 IWL_WARN(mvm, "P2P_DEVICE remain on channel already running\n");
 774                 return -EBUSY;
 775         }
 776
 777         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
 778         time_cmd.id_and_color =
 779                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 780
 781         switch (type) {
 782         case IEEE80211_ROC_TYPE_NORMAL:
 783                 time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_NORMAL);
 784                 break;
 785         case IEEE80211_ROC_TYPE_MGMT_TX:
 786                 time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_MGMT_TX);
 787                 break;
 788         default:
 789                 WARN_ONCE(1, "Got an invalid ROC type\n");
 790                 return -EINVAL;
 791         }
 792
 793         time_cmd.apply_time = cpu_to_le32(0);
 794         time_cmd.interval = cpu_to_le32(1);
 795
 796         /*
 797          * The P2P Device TEs can have lower priority than other events
 798          * that are being scheduled by the driver/fw, and thus it might not be
 799          * scheduled. To improve the chances of it being scheduled, allow them
 800          * to be fragmented, and in addition allow them to be delayed.
 801          */
 802         time_cmd.max_frags = min(MSEC_TO_TU(duration)/50, TE_V2_FRAG_ENDLESS);
 803         time_cmd.max_delay = cpu_to_le32(MSEC_TO_TU(duration/2));
 804         time_cmd.duration = cpu_to_le32(MSEC_TO_TU(duration));
 805         time_cmd.repeat = 1;
 806         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
 807                                       TE_V2_NOTIF_HOST_EVENT_END |
 808                                       TE_V2_START_IMMEDIATELY);
 809
 810         return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
 811 }
 812
 813 static struct iwl_mvm_time_event_data *iwl_mvm_get_roc_te(struct iwl_mvm *mvm)
 814 {
 815         struct iwl_mvm_time_event_data *te_data;
 816
 817         lockdep_assert_held(&mvm->mutex);
 818
 819         spin_lock_bh(&mvm->time_event_lock);
 820
 821         /*
 822          * Iterate over the list of time events and find the time event that is
 823          * associated with a P2P_DEVICE interface.
 824          * This assumes that a P2P_DEVICE interface can have only a single time
 825          * event at any given time and this time event coresponds to a ROC
 826          * request
 827          */
 828         list_for_each_entry(te_data, &mvm->time_event_list, list) {
 829                 if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE)
 830                         goto out;
 831         }
 832
 833         /* There can only be at most one AUX ROC time event, we just use the
 834          * list to simplify/unify code. Remove it if it exists.
 835          */
 836         te_data = list_first_entry_or_null(&mvm->aux_roc_te_list,
 837                                            struct iwl_mvm_time_event_data,
 838                                            list);
 839 out:
 840         spin_unlock_bh(&mvm->time_event_lock);
 841         return te_data;
 842 }
 843
 844 void iwl_mvm_cleanup_roc_te(struct iwl_mvm *mvm)
 845 {
 846         struct iwl_mvm_time_event_data *te_data;
 847         u32 uid;
 848
 849         te_data = iwl_mvm_get_roc_te(mvm);
 850         if (te_data)
 851                 __iwl_mvm_remove_time_event(mvm, te_data, &uid);
 852 }
 853
 854 void iwl_mvm_stop_roc(struct iwl_mvm *mvm)
 855 {
 856         struct iwl_mvm_vif *mvmvif;
 857         struct iwl_mvm_time_event_data *te_data;
 858
 859         te_data = iwl_mvm_get_roc_te(mvm);
 860         if (!te_data) {
 861                 IWL_WARN(mvm, "No remain on channel event\n");
 862                 return;
 863         }
 864
 865         mvmvif = iwl_mvm_vif_from_mac80211(te_data->vif);
 866
 867         if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) {
 868                 iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
 869                 set_bit(IWL_MVM_STATUS_NEED_FLUSH_P2P, &mvm->status);
 870         } else {
 871                 iwl_mvm_remove_aux_roc_te(mvm, mvmvif, te_data);
 872         }
 873
 874         iwl_mvm_roc_finished(mvm);
 875 }
 876
 877 int iwl_mvm_schedule_csa_period(struct iwl_mvm *mvm,
 878                                 struct ieee80211_vif *vif,
 879                                 u32 duration, u32 apply_time)
 880 {
 881         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 882         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 883         struct iwl_time_event_cmd time_cmd = {};
 884
 885         lockdep_assert_held(&mvm->mutex);
 886
 887         if (te_data->running) {
 888                 u32 id;
 889
 890                 spin_lock_bh(&mvm->time_event_lock);
 891                 id = te_data->id;
 892                 spin_unlock_bh(&mvm->time_event_lock);
 893
 894                 if (id == TE_CHANNEL_SWITCH_PERIOD) {
 895                         IWL_DEBUG_TE(mvm, "CS period is already scheduled\n");
 896                         return -EBUSY;
 897                 }
 898
 899                 /*
 900                  * Remove the session protection time event to allow the
 901                  * channel switch. If we got here, we just heard a beacon so
 902                  * the session protection is not needed anymore anyway.
 903                  */
 904                 iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
 905         }
 906
 907         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
 908         time_cmd.id_and_color =
 909                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 910         time_cmd.id = cpu_to_le32(TE_CHANNEL_SWITCH_PERIOD);
 911         time_cmd.apply_time = cpu_to_le32(apply_time);
 912         time_cmd.max_frags = TE_V2_FRAG_NONE;
 913         time_cmd.duration = cpu_to_le32(duration);
 914         time_cmd.repeat = 1;
 915         time_cmd.interval = cpu_to_le32(1);
 916         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
 917                                       TE_V2_ABSENCE);
 918         if (!apply_time)
 919                 time_cmd.policy |= cpu_to_le16(TE_V2_START_IMMEDIATELY);
 920
 921         return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
 922 }