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 16 * WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 * General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110, 23 * USA 24 * 25 * The full GNU General Public License is included in this distribution 26 * in the file called COPYING. 27 * 28 * Contact Information: 29 * Intel Linux Wireless <linuxwifi@intel.com> 30 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 31 * 32 * BSD LICENSE 33 * 34 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved. 35 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH 36 * All rights reserved. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 42 * * Redistributions of source code must retain the above copyright 43 * notice, this list of conditions and the following disclaimer. 44 * * Redistributions in binary form must reproduce the above copyright 45 * notice, this list of conditions and the following disclaimer in 46 * the documentation and/or other materials provided with the 47 * distribution. 48 * * Neither the name Intel Corporation nor the names of its 49 * contributors may be used to endorse or promote products derived 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, 57 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 58 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 59 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 60 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 61 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 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 if (!le32_to_cpu(notif->status)) { 375 IWL_DEBUG_TE(mvm, 376 "ERROR: Aux ROC Time Event %s notification failure\n", 377 (le32_to_cpu(notif->action) & 378 TE_V2_NOTIF_HOST_EVENT_START) ? "start" : "end"); 379 return -EINVAL; 380 } 381 382 IWL_DEBUG_TE(mvm, 383 "Aux ROC time event notification - UID = 0x%x action %d\n", 384 le32_to_cpu(notif->unique_id), 385 le32_to_cpu(notif->action)); 386 387 if (le32_to_cpu(notif->action) == TE_V2_NOTIF_HOST_EVENT_END) { 388 /* End TE, notify mac80211 */ 389 ieee80211_remain_on_channel_expired(mvm->hw); 390 iwl_mvm_roc_finished(mvm); /* flush aux queue */ 391 list_del(&te_data->list); /* remove from list */ 392 te_data->running = false; 393 te_data->vif = NULL; 394 te_data->uid = 0; 395 te_data->id = TE_MAX; 396 } else if (le32_to_cpu(notif->action) == TE_V2_NOTIF_HOST_EVENT_START) { 397 set_bit(IWL_MVM_STATUS_ROC_AUX_RUNNING, &mvm->status); 398 te_data->running = true; 399 iwl_mvm_ref(mvm, IWL_MVM_REF_ROC_AUX); 400 ieee80211_ready_on_channel(mvm->hw); /* Start TE */ 401 } else { 402 IWL_DEBUG_TE(mvm, 403 "ERROR: Unknown Aux ROC Time Event (action = %d)\n", 404 le32_to_cpu(notif->action)); 405 return -EINVAL; 406 } 407 408 return 0; 409 } 410 411 /* 412 * The Rx handler for time event notifications 413 */ 414 void iwl_mvm_rx_time_event_notif(struct iwl_mvm *mvm, 415 struct iwl_rx_cmd_buffer *rxb) 416 { 417 struct iwl_rx_packet *pkt = rxb_addr(rxb); 418 struct iwl_time_event_notif *notif = (void *)pkt->data; 419 struct iwl_mvm_time_event_data *te_data, *tmp; 420 421 IWL_DEBUG_TE(mvm, "Time event notification - UID = 0x%x action %d\n", 422 le32_to_cpu(notif->unique_id), 423 le32_to_cpu(notif->action)); 424 425 spin_lock_bh(&mvm->time_event_lock); 426 /* This time event is triggered for Aux ROC request */ 427 if (!iwl_mvm_aux_roc_te_handle_notif(mvm, notif)) 428 goto unlock; 429 430 list_for_each_entry_safe(te_data, tmp, &mvm->time_event_list, list) { 431 if (le32_to_cpu(notif->unique_id) == te_data->uid) 432 iwl_mvm_te_handle_notif(mvm, te_data, notif); 433 } 434 unlock: 435 spin_unlock_bh(&mvm->time_event_lock); 436 } 437 438 static bool iwl_mvm_te_notif(struct iwl_notif_wait_data *notif_wait, 439 struct iwl_rx_packet *pkt, void *data) 440 { 441 struct iwl_mvm *mvm = 442 container_of(notif_wait, struct iwl_mvm, notif_wait); 443 struct iwl_mvm_time_event_data *te_data = data; 444 struct iwl_time_event_notif *resp; 445 int resp_len = iwl_rx_packet_payload_len(pkt); 446 447 if (WARN_ON(pkt->hdr.cmd != TIME_EVENT_NOTIFICATION)) 448 return true; 449 450 if (WARN_ON_ONCE(resp_len != sizeof(*resp))) { 451 IWL_ERR(mvm, "Invalid TIME_EVENT_NOTIFICATION response\n"); 452 return true; 453 } 454 455 resp = (void *)pkt->data; 456 457 /* te_data->uid is already set in the TIME_EVENT_CMD response */ 458 if (le32_to_cpu(resp->unique_id) != te_data->uid) 459 return false; 460 461 IWL_DEBUG_TE(mvm, "TIME_EVENT_NOTIFICATION response - UID = 0x%x\n", 462 te_data->uid); 463 if (!resp->status) 464 IWL_ERR(mvm, 465 "TIME_EVENT_NOTIFICATION received but not executed\n"); 466 467 return true; 468 } 469 470 static bool iwl_mvm_time_event_response(struct iwl_notif_wait_data *notif_wait, 471 struct iwl_rx_packet *pkt, void *data) 472 { 473 struct iwl_mvm *mvm = 474 container_of(notif_wait, struct iwl_mvm, notif_wait); 475 struct iwl_mvm_time_event_data *te_data = data; 476 struct iwl_time_event_resp *resp; 477 int resp_len = iwl_rx_packet_payload_len(pkt); 478 479 if (WARN_ON(pkt->hdr.cmd != TIME_EVENT_CMD)) 480 return true; 481 482 if (WARN_ON_ONCE(resp_len != sizeof(*resp))) { 483 IWL_ERR(mvm, "Invalid TIME_EVENT_CMD response\n"); 484 return true; 485 } 486 487 resp = (void *)pkt->data; 488 489 /* we should never get a response to another TIME_EVENT_CMD here */ 490 if (WARN_ON_ONCE(le32_to_cpu(resp->id) != te_data->id)) 491 return false; 492 493 te_data->uid = le32_to_cpu(resp->unique_id); 494 IWL_DEBUG_TE(mvm, "TIME_EVENT_CMD response - UID = 0x%x\n", 495 te_data->uid); 496 return true; 497 } 498 499 static int iwl_mvm_time_event_send_add(struct iwl_mvm *mvm, 500 struct ieee80211_vif *vif, 501 struct iwl_mvm_time_event_data *te_data, 502 struct iwl_time_event_cmd *te_cmd) 503 { 504 static const u16 time_event_response[] = { TIME_EVENT_CMD }; 505 struct iwl_notification_wait wait_time_event; 506 int ret; 507 508 lockdep_assert_held(&mvm->mutex); 509 510 IWL_DEBUG_TE(mvm, "Add new TE, duration %d TU\n", 511 le32_to_cpu(te_cmd->duration)); 512 513 spin_lock_bh(&mvm->time_event_lock); 514 if (WARN_ON(te_data->id != TE_MAX)) { 515 spin_unlock_bh(&mvm->time_event_lock); 516 return -EIO; 517 } 518 te_data->vif = vif; 519 te_data->duration = le32_to_cpu(te_cmd->duration); 520 te_data->id = le32_to_cpu(te_cmd->id); 521 list_add_tail(&te_data->list, &mvm->time_event_list); 522 spin_unlock_bh(&mvm->time_event_lock); 523 524 /* 525 * Use a notification wait, which really just processes the 526 * command response and doesn't wait for anything, in order 527 * to be able to process the response and get the UID inside 528 * the RX path. Using CMD_WANT_SKB doesn't work because it 529 * stores the buffer and then wakes up this thread, by which 530 * time another notification (that the time event started) 531 * might already be processed unsuccessfully. 532 */ 533 iwl_init_notification_wait(&mvm->notif_wait, &wait_time_event, 534 time_event_response, 535 ARRAY_SIZE(time_event_response), 536 iwl_mvm_time_event_response, te_data); 537 538 ret = iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, 0, 539 sizeof(*te_cmd), te_cmd); 540 if (ret) { 541 IWL_ERR(mvm, "Couldn't send TIME_EVENT_CMD: %d\n", ret); 542 iwl_remove_notification(&mvm->notif_wait, &wait_time_event); 543 goto out_clear_te; 544 } 545 546 /* No need to wait for anything, so just pass 1 (0 isn't valid) */ 547 ret = iwl_wait_notification(&mvm->notif_wait, &wait_time_event, 1); 548 /* should never fail */ 549 WARN_ON_ONCE(ret); 550 551 if (ret) { 552 out_clear_te: 553 spin_lock_bh(&mvm->time_event_lock); 554 iwl_mvm_te_clear_data(mvm, te_data); 555 spin_unlock_bh(&mvm->time_event_lock); 556 } 557 return ret; 558 } 559 560 void iwl_mvm_protect_session(struct iwl_mvm *mvm, 561 struct ieee80211_vif *vif, 562 u32 duration, u32 min_duration, 563 u32 max_delay, bool wait_for_notif) 564 { 565 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif); 566 struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data; 567 const u16 te_notif_response[] = { TIME_EVENT_NOTIFICATION }; 568 struct iwl_notification_wait wait_te_notif; 569 struct iwl_time_event_cmd time_cmd = {}; 570 571 lockdep_assert_held(&mvm->mutex); 572 573 if (te_data->running && 574 time_after(te_data->end_jiffies, TU_TO_EXP_TIME(min_duration))) { 575 IWL_DEBUG_TE(mvm, "We have enough time in the current TE: %u\n", 576 jiffies_to_msecs(te_data->end_jiffies - jiffies)); 577 return; 578 } 579 580 if (te_data->running) { 581 IWL_DEBUG_TE(mvm, "extend 0x%x: only %u ms left\n", 582 te_data->uid, 583 jiffies_to_msecs(te_data->end_jiffies - jiffies)); 584 /* 585 * we don't have enough time 586 * cancel the current TE and issue a new one 587 * Of course it would be better to remove the old one only 588 * when the new one is added, but we don't care if we are off 589 * channel for a bit. All we need to do, is not to return 590 * before we actually begin to be on the channel. 591 */ 592 iwl_mvm_stop_session_protection(mvm, vif); 593 } 594 595 time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD); 596 time_cmd.id_and_color = 597 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color)); 598 time_cmd.id = cpu_to_le32(TE_BSS_STA_AGGRESSIVE_ASSOC); 599 600 time_cmd.apply_time = cpu_to_le32(0); 601 602 time_cmd.max_frags = TE_V2_FRAG_NONE; 603 time_cmd.max_delay = cpu_to_le32(max_delay); 604 /* TODO: why do we need to interval = bi if it is not periodic? */ 605 time_cmd.interval = cpu_to_le32(1); 606 time_cmd.duration = cpu_to_le32(duration); 607 time_cmd.repeat = 1; 608 time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START | 609 TE_V2_NOTIF_HOST_EVENT_END | 610 T2_V2_START_IMMEDIATELY); 611 612 if (!wait_for_notif) { 613 iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd); 614 return; 615 } 616 617 /* 618 * Create notification_wait for the TIME_EVENT_NOTIFICATION to use 619 * right after we send the time event 620 */ 621 iwl_init_notification_wait(&mvm->notif_wait, &wait_te_notif, 622 te_notif_response, 623 ARRAY_SIZE(te_notif_response), 624 iwl_mvm_te_notif, te_data); 625 626 /* If TE was sent OK - wait for the notification that started */ 627 if (iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd)) { 628 IWL_ERR(mvm, "Failed to add TE to protect session\n"); 629 iwl_remove_notification(&mvm->notif_wait, &wait_te_notif); 630 } else if (iwl_wait_notification(&mvm->notif_wait, &wait_te_notif, 631 TU_TO_JIFFIES(max_delay))) { 632 IWL_ERR(mvm, "Failed to protect session until TE\n"); 633 } 634 } 635 636 static bool __iwl_mvm_remove_time_event(struct iwl_mvm *mvm, 637 struct iwl_mvm_time_event_data *te_data, 638 u32 *uid) 639 { 640 u32 id; 641 642 /* 643 * It is possible that by the time we got to this point the time 644 * event was already removed. 645 */ 646 spin_lock_bh(&mvm->time_event_lock); 647 648 /* Save time event uid before clearing its data */ 649 *uid = te_data->uid; 650 id = te_data->id; 651 652 /* 653 * The clear_data function handles time events that were already removed 654 */ 655 iwl_mvm_te_clear_data(mvm, te_data); 656 spin_unlock_bh(&mvm->time_event_lock); 657 658 /* 659 * It is possible that by the time we try to remove it, the time event 660 * has already ended and removed. In such a case there is no need to 661 * send a removal command. 662 */ 663 if (id == TE_MAX) { 664 IWL_DEBUG_TE(mvm, "TE 0x%x has already ended\n", *uid); 665 return false; 666 } 667 668 return true; 669 } 670 671 /* 672 * Explicit request to remove a aux roc time event. The removal of a time 673 * event needs to be synchronized with the flow of a time event's end 674 * notification, which also removes the time event from the op mode 675 * data structures. 676 */ 677 static void iwl_mvm_remove_aux_roc_te(struct iwl_mvm *mvm, 678 struct iwl_mvm_vif *mvmvif, 679 struct iwl_mvm_time_event_data *te_data) 680 { 681 struct iwl_hs20_roc_req aux_cmd = {}; 682 u32 uid; 683 int ret; 684 685 if (!__iwl_mvm_remove_time_event(mvm, te_data, &uid)) 686 return; 687 688 aux_cmd.event_unique_id = cpu_to_le32(uid); 689 aux_cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE); 690 aux_cmd.id_and_color = 691 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color)); 692 IWL_DEBUG_TE(mvm, "Removing BSS AUX ROC TE 0x%x\n", 693 le32_to_cpu(aux_cmd.event_unique_id)); 694 ret = iwl_mvm_send_cmd_pdu(mvm, HOT_SPOT_CMD, 0, 695 sizeof(aux_cmd), &aux_cmd); 696 697 if (WARN_ON(ret)) 698 return; 699 } 700 701 /* 702 * Explicit request to remove a time event. The removal of a time event needs to 703 * be synchronized with the flow of a time event's end notification, which also 704 * removes the time event from the op mode data structures. 705 */ 706 void iwl_mvm_remove_time_event(struct iwl_mvm *mvm, 707 struct iwl_mvm_vif *mvmvif, 708 struct iwl_mvm_time_event_data *te_data) 709 { 710 struct iwl_time_event_cmd time_cmd = {}; 711 u32 uid; 712 int ret; 713 714 if (!__iwl_mvm_remove_time_event(mvm, te_data, &uid)) 715 return; 716 717 /* When we remove a TE, the UID is to be set in the id field */ 718 time_cmd.id = cpu_to_le32(uid); 719 time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE); 720 time_cmd.id_and_color = 721 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color)); 722 723 IWL_DEBUG_TE(mvm, "Removing TE 0x%x\n", le32_to_cpu(time_cmd.id)); 724 ret = iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, 0, 725 sizeof(time_cmd), &time_cmd); 726 if (WARN_ON(ret)) 727 return; 728 } 729 730 void iwl_mvm_stop_session_protection(struct iwl_mvm *mvm, 731 struct ieee80211_vif *vif) 732 { 733 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif); 734 struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data; 735 736 lockdep_assert_held(&mvm->mutex); 737 iwl_mvm_remove_time_event(mvm, mvmvif, te_data); 738 } 739 740 int iwl_mvm_start_p2p_roc(struct iwl_mvm *mvm, struct ieee80211_vif *vif, 741 int duration, enum ieee80211_roc_type type) 742 { 743 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif); 744 struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data; 745 struct iwl_time_event_cmd time_cmd = {}; 746 747 lockdep_assert_held(&mvm->mutex); 748 if (te_data->running) { 749 IWL_WARN(mvm, "P2P_DEVICE remain on channel already running\n"); 750 return -EBUSY; 751 } 752 753 /* 754 * Flush the done work, just in case it's still pending, so that 755 * the work it does can complete and we can accept new frames. 756 */ 757 flush_work(&mvm->roc_done_wk); 758 759 time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD); 760 time_cmd.id_and_color = 761 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color)); 762 763 switch (type) { 764 case IEEE80211_ROC_TYPE_NORMAL: 765 time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_NORMAL); 766 break; 767 case IEEE80211_ROC_TYPE_MGMT_TX: 768 time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_MGMT_TX); 769 break; 770 default: 771 WARN_ONCE(1, "Got an invalid ROC type\n"); 772 return -EINVAL; 773 } 774 775 time_cmd.apply_time = cpu_to_le32(0); 776 time_cmd.interval = cpu_to_le32(1); 777 778 /* 779 * The P2P Device TEs can have lower priority than other events 780 * that are being scheduled by the driver/fw, and thus it might not be 781 * scheduled. To improve the chances of it being scheduled, allow them 782 * to be fragmented, and in addition allow them to be delayed. 783 */ 784 time_cmd.max_frags = min(MSEC_TO_TU(duration)/50, TE_V2_FRAG_ENDLESS); 785 time_cmd.max_delay = cpu_to_le32(MSEC_TO_TU(duration/2)); 786 time_cmd.duration = cpu_to_le32(MSEC_TO_TU(duration)); 787 time_cmd.repeat = 1; 788 time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START | 789 TE_V2_NOTIF_HOST_EVENT_END | 790 T2_V2_START_IMMEDIATELY); 791 792 return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd); 793 } 794 795 void iwl_mvm_stop_roc(struct iwl_mvm *mvm) 796 { 797 struct iwl_mvm_vif *mvmvif = NULL; 798 struct iwl_mvm_time_event_data *te_data; 799 bool is_p2p = false; 800 801 lockdep_assert_held(&mvm->mutex); 802 803 spin_lock_bh(&mvm->time_event_lock); 804 805 /* 806 * Iterate over the list of time events and find the time event that is 807 * associated with a P2P_DEVICE interface. 808 * This assumes that a P2P_DEVICE interface can have only a single time 809 * event at any given time and this time event coresponds to a ROC 810 * request 811 */ 812 list_for_each_entry(te_data, &mvm->time_event_list, list) { 813 if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) { 814 mvmvif = iwl_mvm_vif_from_mac80211(te_data->vif); 815 is_p2p = true; 816 goto remove_te; 817 } 818 } 819 820 /* There can only be at most one AUX ROC time event, we just use the 821 * list to simplify/unify code. Remove it if it exists. 822 */ 823 te_data = list_first_entry_or_null(&mvm->aux_roc_te_list, 824 struct iwl_mvm_time_event_data, 825 list); 826 if (te_data) 827 mvmvif = iwl_mvm_vif_from_mac80211(te_data->vif); 828 829 remove_te: 830 spin_unlock_bh(&mvm->time_event_lock); 831 832 if (!mvmvif) { 833 IWL_WARN(mvm, "No remain on channel event\n"); 834 return; 835 } 836 837 if (is_p2p) 838 iwl_mvm_remove_time_event(mvm, mvmvif, te_data); 839 else 840 iwl_mvm_remove_aux_roc_te(mvm, mvmvif, te_data); 841 842 iwl_mvm_roc_finished(mvm); 843 } 844 845 int iwl_mvm_schedule_csa_period(struct iwl_mvm *mvm, 846 struct ieee80211_vif *vif, 847 u32 duration, u32 apply_time) 848 { 849 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif); 850 struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data; 851 struct iwl_time_event_cmd time_cmd = {}; 852 853 lockdep_assert_held(&mvm->mutex); 854 855 if (te_data->running) { 856 IWL_DEBUG_TE(mvm, "CS period is already scheduled\n"); 857 return -EBUSY; 858 } 859 860 time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD); 861 time_cmd.id_and_color = 862 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color)); 863 time_cmd.id = cpu_to_le32(TE_CHANNEL_SWITCH_PERIOD); 864 time_cmd.apply_time = cpu_to_le32(apply_time); 865 time_cmd.max_frags = TE_V2_FRAG_NONE; 866 time_cmd.duration = cpu_to_le32(duration); 867 time_cmd.repeat = 1; 868 time_cmd.interval = cpu_to_le32(1); 869 time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START | 870 TE_V2_ABSENCE); 871 872 return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd); 873 } 874