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. 16 * 17 * This program is distributed in the hope that it will be useful, but 18 * WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 20 * General Public License for more details. 21 * 22 * The full GNU General Public License is included in this distribution 23 * in the file called COPYING. 24 * 25 * Contact Information: 26 * Intel Linux Wireless <linuxwifi@intel.com> 27 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 28 * 29 * BSD LICENSE 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 35 * All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 41 * * Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * * Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in 45 * the documentation and/or other materials provided with the 46 * distribution. 47 * * Neither the name Intel Corporation nor the names of its 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 57 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 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->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 } 919