time-event.c 22.9 KB
Newer Older
J
Johannes Berg 已提交
1 2 3 4 5 6 7
/******************************************************************************
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
8
 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
9
 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
J
Johannes Berg 已提交
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
 * USA
 *
 * The full GNU General Public License is included in this distribution
26
 * in the file called COPYING.
J
Johannes Berg 已提交
27 28 29 30 31 32 33
 *
 * Contact Information:
 *  Intel Linux Wireless <ilw@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 * BSD LICENSE
 *
34
 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
35
 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
J
Johannes Berg 已提交
36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *  * Neither the name Intel Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *****************************************************************************/

#include <linux/jiffies.h>
#include <net/mac80211.h>

#include "iwl-notif-wait.h"
#include "iwl-trans.h"
#include "fw-api.h"
#include "time-event.h"
#include "mvm.h"
#include "iwl-io.h"
#include "iwl-prph.h"

77 78 79
/*
 * For the high priority TE use a time event type that has similar priority to
 * the FW's action scan priority.
80
 */
81 82
#define IWL_MVM_ROC_TE_TYPE_NORMAL TE_P2P_DEVICE_DISCOVERABLE
#define IWL_MVM_ROC_TE_TYPE_MGMT_TX TE_P2P_CLIENT_ASSOC
83

J
Johannes Berg 已提交
84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101
void iwl_mvm_te_clear_data(struct iwl_mvm *mvm,
			   struct iwl_mvm_time_event_data *te_data)
{
	lockdep_assert_held(&mvm->time_event_lock);

	if (te_data->id == TE_MAX)
		return;

	list_del(&te_data->list);
	te_data->running = false;
	te_data->uid = 0;
	te_data->id = TE_MAX;
	te_data->vif = NULL;
}

void iwl_mvm_roc_done_wk(struct work_struct *wk)
{
	struct iwl_mvm *mvm = container_of(wk, struct iwl_mvm, roc_done_wk);
102 103 104 105 106 107 108 109 110 111 112 113 114 115 116
	u32 queues = 0;

	/*
	 * Clear the ROC_RUNNING /ROC_AUX_RUNNING status bit.
	 * This will cause the TX path to drop offchannel transmissions.
	 * That would also be done by mac80211, but it is racy, in particular
	 * in the case that the time event actually completed in the firmware
	 * (which is handled in iwl_mvm_te_handle_notif).
	 */
	if (test_and_clear_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status))
		queues |= BIT(IWL_MVM_OFFCHANNEL_QUEUE);
	if (test_and_clear_bit(IWL_MVM_STATUS_ROC_AUX_RUNNING, &mvm->status))
		queues |= BIT(mvm->aux_queue);

	iwl_mvm_unref(mvm, IWL_MVM_REF_ROC);
J
Johannes Berg 已提交
117 118 119 120 121 122 123 124 125 126 127 128 129

	synchronize_net();

	/*
	 * Flush the offchannel queue -- this is called when the time
	 * event finishes or is cancelled, so that frames queued for it
	 * won't get stuck on the queue and be transmitted in the next
	 * time event.
	 * We have to send the command asynchronously since this cannot
	 * be under the mutex for locking reasons, but that's not an
	 * issue as it will have to complete before the next command is
	 * executed, and a new time event means a new command.
	 */
130
	iwl_mvm_flush_tx_path(mvm, queues, false);
J
Johannes Berg 已提交
131 132 133 134 135 136 137 138 139 140 141 142 143 144
}

static void iwl_mvm_roc_finished(struct iwl_mvm *mvm)
{
	/*
	 * Of course, our status bit is just as racy as mac80211, so in
	 * addition, fire off the work struct which will drop all frames
	 * from the hardware queues that made it through the race. First
	 * it will of course synchronize the TX path to make sure that
	 * any *new* TX will be rejected.
	 */
	schedule_work(&mvm->roc_done_wk);
}

145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179
static void iwl_mvm_csa_noa_start(struct iwl_mvm *mvm)
{
	struct ieee80211_vif *csa_vif;

	rcu_read_lock();

	csa_vif = rcu_dereference(mvm->csa_vif);
	if (!csa_vif || !csa_vif->csa_active)
		goto out_unlock;

	IWL_DEBUG_TE(mvm, "CSA NOA started\n");

	/*
	 * CSA NoA is started but we still have beacons to
	 * transmit on the current channel.
	 * So we just do nothing here and the switch
	 * will be performed on the last TBTT.
	 */
	if (!ieee80211_csa_is_complete(csa_vif)) {
		IWL_WARN(mvm, "CSA NOA started too early\n");
		goto out_unlock;
	}

	ieee80211_csa_finish(csa_vif);

	rcu_read_unlock();

	RCU_INIT_POINTER(mvm->csa_vif, NULL);

	return;

out_unlock:
	rcu_read_unlock();
}

180 181 182 183 184 185 186 187 188 189 190 191 192 193
static bool iwl_mvm_te_check_disconnect(struct iwl_mvm *mvm,
					struct ieee80211_vif *vif,
					const char *errmsg)
{
	if (vif->type != NL80211_IFTYPE_STATION)
		return false;
	if (vif->bss_conf.assoc && vif->bss_conf.dtim_period)
		return false;
	if (errmsg)
		IWL_ERR(mvm, "%s\n", errmsg);
	ieee80211_connection_loss(vif);
	return true;
}

J
Johannes Berg 已提交
194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218
/*
 * Handles a FW notification for an event that is known to the driver.
 *
 * @mvm: the mvm component
 * @te_data: the time event data
 * @notif: the notification data corresponding the time event data.
 */
static void iwl_mvm_te_handle_notif(struct iwl_mvm *mvm,
				    struct iwl_mvm_time_event_data *te_data,
				    struct iwl_time_event_notif *notif)
{
	lockdep_assert_held(&mvm->time_event_lock);

	IWL_DEBUG_TE(mvm, "Handle time event notif - UID = 0x%x action %d\n",
		     le32_to_cpu(notif->unique_id),
		     le32_to_cpu(notif->action));

	/*
	 * The FW sends the start/end time event notifications even for events
	 * that it fails to schedule. This is indicated in the status field of
	 * the notification. This happens in cases that the scheduler cannot
	 * find a schedule that can handle the event (for example requesting a
	 * P2P Device discoveribility, while there are other higher priority
	 * events in the system).
	 */
219 220 221 222 223
	if (!le32_to_cpu(notif->status)) {
		bool start = le32_to_cpu(notif->action) &
				TE_V2_NOTIF_HOST_EVENT_START;
		IWL_WARN(mvm, "Time Event %s notification failure\n",
			 start ? "start" : "end");
224 225 226 227 228
		if (iwl_mvm_te_check_disconnect(mvm, te_data->vif, NULL)) {
			iwl_mvm_te_clear_data(mvm, te_data);
			return;
		}
	}
J
Johannes Berg 已提交
229

230
	if (le32_to_cpu(notif->action) & TE_V2_NOTIF_HOST_EVENT_END) {
J
Johannes Berg 已提交
231 232 233 234 235 236 237 238 239 240 241 242 243
		IWL_DEBUG_TE(mvm,
			     "TE ended - current time %lu, estimated end %lu\n",
			     jiffies, te_data->end_jiffies);

		if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) {
			ieee80211_remain_on_channel_expired(mvm->hw);
			iwl_mvm_roc_finished(mvm);
		}

		/*
		 * By now, we should have finished association
		 * and know the dtim period.
		 */
244
		iwl_mvm_te_check_disconnect(mvm, te_data->vif,
245
			"No association and the time event is over already...");
J
Johannes Berg 已提交
246
		iwl_mvm_te_clear_data(mvm, te_data);
247
	} else if (le32_to_cpu(notif->action) & TE_V2_NOTIF_HOST_EVENT_START) {
J
Johannes Berg 已提交
248
		te_data->running = true;
249
		te_data->end_jiffies = TU_TO_EXP_TIME(te_data->duration);
J
Johannes Berg 已提交
250 251 252

		if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) {
			set_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status);
253
			iwl_mvm_ref(mvm, IWL_MVM_REF_ROC);
J
Johannes Berg 已提交
254
			ieee80211_ready_on_channel(mvm->hw);
255 256 257 258 259 260 261 262
		} else if (te_data->vif->type == NL80211_IFTYPE_AP) {
			if (le32_to_cpu(notif->status))
				iwl_mvm_csa_noa_start(mvm);
			else
				IWL_DEBUG_TE(mvm, "CSA NOA failed to start\n");

			/* we don't need it anymore */
			iwl_mvm_te_clear_data(mvm, te_data);
J
Johannes Berg 已提交
263 264 265 266 267 268
		}
	} else {
		IWL_WARN(mvm, "Got TE with unknown action\n");
	}
}

269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322
/*
 * Handle A Aux ROC time event
 */
static int iwl_mvm_aux_roc_te_handle_notif(struct iwl_mvm *mvm,
					   struct iwl_time_event_notif *notif)
{
	struct iwl_mvm_time_event_data *te_data, *tmp;
	bool aux_roc_te = false;

	list_for_each_entry_safe(te_data, tmp, &mvm->aux_roc_te_list, list) {
		if (le32_to_cpu(notif->unique_id) == te_data->uid) {
			aux_roc_te = true;
			break;
		}
	}
	if (!aux_roc_te) /* Not a Aux ROC time event */
		return -EINVAL;

	if (!le32_to_cpu(notif->status)) {
		IWL_DEBUG_TE(mvm,
			     "ERROR: Aux ROC Time Event %s notification failure\n",
			     (le32_to_cpu(notif->action) &
			      TE_V2_NOTIF_HOST_EVENT_START) ? "start" : "end");
		return -EINVAL;
	}

	IWL_DEBUG_TE(mvm,
		     "Aux ROC time event notification  - UID = 0x%x action %d\n",
		     le32_to_cpu(notif->unique_id),
		     le32_to_cpu(notif->action));

	if (le32_to_cpu(notif->action) == TE_V2_NOTIF_HOST_EVENT_END) {
		/* End TE, notify mac80211 */
		ieee80211_remain_on_channel_expired(mvm->hw);
		iwl_mvm_roc_finished(mvm); /* flush aux queue */
		list_del(&te_data->list); /* remove from list */
		te_data->running = false;
		te_data->vif = NULL;
		te_data->uid = 0;
	} else if (le32_to_cpu(notif->action) == TE_V2_NOTIF_HOST_EVENT_START) {
		set_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status);
		set_bit(IWL_MVM_STATUS_ROC_AUX_RUNNING, &mvm->status);
		te_data->running = true;
		ieee80211_ready_on_channel(mvm->hw); /* Start TE */
	} else {
		IWL_DEBUG_TE(mvm,
			     "ERROR: Unknown Aux ROC Time Event (action = %d)\n",
			     le32_to_cpu(notif->action));
		return -EINVAL;
	}

	return 0;
}

J
Johannes Berg 已提交
323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338
/*
 * The Rx handler for time event notifications
 */
int iwl_mvm_rx_time_event_notif(struct iwl_mvm *mvm,
				struct iwl_rx_cmd_buffer *rxb,
				struct iwl_device_cmd *cmd)
{
	struct iwl_rx_packet *pkt = rxb_addr(rxb);
	struct iwl_time_event_notif *notif = (void *)pkt->data;
	struct iwl_mvm_time_event_data *te_data, *tmp;

	IWL_DEBUG_TE(mvm, "Time event notification - UID = 0x%x action %d\n",
		     le32_to_cpu(notif->unique_id),
		     le32_to_cpu(notif->action));

	spin_lock_bh(&mvm->time_event_lock);
339 340 341 342
	/* This time event is triggered for Aux ROC request */
	if (!iwl_mvm_aux_roc_te_handle_notif(mvm, notif))
		goto unlock;

J
Johannes Berg 已提交
343 344 345 346
	list_for_each_entry_safe(te_data, tmp, &mvm->time_event_list, list) {
		if (le32_to_cpu(notif->unique_id) == te_data->uid)
			iwl_mvm_te_handle_notif(mvm, te_data, notif);
	}
347
unlock:
J
Johannes Berg 已提交
348 349 350 351 352
	spin_unlock_bh(&mvm->time_event_lock);

	return 0;
}

353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384
static bool iwl_mvm_te_notif(struct iwl_notif_wait_data *notif_wait,
			     struct iwl_rx_packet *pkt, void *data)
{
	struct iwl_mvm *mvm =
		container_of(notif_wait, struct iwl_mvm, notif_wait);
	struct iwl_mvm_time_event_data *te_data = data;
	struct iwl_time_event_notif *resp;
	int resp_len = iwl_rx_packet_payload_len(pkt);

	if (WARN_ON(pkt->hdr.cmd != TIME_EVENT_NOTIFICATION))
		return true;

	if (WARN_ON_ONCE(resp_len != sizeof(*resp))) {
		IWL_ERR(mvm, "Invalid TIME_EVENT_NOTIFICATION response\n");
		return true;
	}

	resp = (void *)pkt->data;

	/* te_data->uid is already set in the TIME_EVENT_CMD response */
	if (le32_to_cpu(resp->unique_id) != te_data->uid)
		return false;

	IWL_DEBUG_TE(mvm, "TIME_EVENT_NOTIFICATION response - UID = 0x%x\n",
		     te_data->uid);
	if (!resp->status)
		IWL_ERR(mvm,
			"TIME_EVENT_NOTIFICATION received but not executed\n");

	return true;
}

385 386
static bool iwl_mvm_time_event_response(struct iwl_notif_wait_data *notif_wait,
					struct iwl_rx_packet *pkt, void *data)
J
Johannes Berg 已提交
387 388 389 390 391
{
	struct iwl_mvm *mvm =
		container_of(notif_wait, struct iwl_mvm, notif_wait);
	struct iwl_mvm_time_event_data *te_data = data;
	struct iwl_time_event_resp *resp;
392
	int resp_len = iwl_rx_packet_payload_len(pkt);
J
Johannes Berg 已提交
393

394 395
	if (WARN_ON(pkt->hdr.cmd != TIME_EVENT_CMD))
		return true;
J
Johannes Berg 已提交
396

397
	if (WARN_ON_ONCE(resp_len != sizeof(*resp))) {
398 399 400
		IWL_ERR(mvm, "Invalid TIME_EVENT_CMD response\n");
		return true;
	}
J
Johannes Berg 已提交
401

402
	resp = (void *)pkt->data;
403 404 405 406 407

	/* we should never get a response to another TIME_EVENT_CMD here */
	if (WARN_ON_ONCE(le32_to_cpu(resp->id) != te_data->id))
		return false;

408 409 410 411 412
	te_data->uid = le32_to_cpu(resp->unique_id);
	IWL_DEBUG_TE(mvm, "TIME_EVENT_CMD response - UID = 0x%x\n",
		     te_data->uid);
	return true;
}
J
Johannes Berg 已提交
413

414 415 416
static int iwl_mvm_time_event_send_add(struct iwl_mvm *mvm,
				       struct ieee80211_vif *vif,
				       struct iwl_mvm_time_event_data *te_data,
417
				       struct iwl_time_event_cmd *te_cmd)
418 419 420 421 422 423 424
{
	static const u8 time_event_response[] = { TIME_EVENT_CMD };
	struct iwl_notification_wait wait_time_event;
	int ret;

	lockdep_assert_held(&mvm->mutex);

425 426 427
	IWL_DEBUG_TE(mvm, "Add new TE, duration %d TU\n",
		     le32_to_cpu(te_cmd->duration));

428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452
	spin_lock_bh(&mvm->time_event_lock);
	if (WARN_ON(te_data->id != TE_MAX)) {
		spin_unlock_bh(&mvm->time_event_lock);
		return -EIO;
	}
	te_data->vif = vif;
	te_data->duration = le32_to_cpu(te_cmd->duration);
	te_data->id = le32_to_cpu(te_cmd->id);
	list_add_tail(&te_data->list, &mvm->time_event_list);
	spin_unlock_bh(&mvm->time_event_lock);

	/*
	 * Use a notification wait, which really just processes the
	 * command response and doesn't wait for anything, in order
	 * to be able to process the response and get the UID inside
	 * the RX path. Using CMD_WANT_SKB doesn't work because it
	 * stores the buffer and then wakes up this thread, by which
	 * time another notification (that the time event started)
	 * might already be processed unsuccessfully.
	 */
	iwl_init_notification_wait(&mvm->notif_wait, &wait_time_event,
				   time_event_response,
				   ARRAY_SIZE(time_event_response),
				   iwl_mvm_time_event_response, te_data);

E
Emmanuel Grumbach 已提交
453
	ret = iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, 0,
454
					    sizeof(*te_cmd), te_cmd);
455 456 457 458 459
	if (ret) {
		IWL_ERR(mvm, "Couldn't send TIME_EVENT_CMD: %d\n", ret);
		iwl_remove_notification(&mvm->notif_wait, &wait_time_event);
		goto out_clear_te;
	}
J
Johannes Berg 已提交
460

461 462 463 464 465 466 467 468 469 470 471 472
	/* No need to wait for anything, so just pass 1 (0 isn't valid) */
	ret = iwl_wait_notification(&mvm->notif_wait, &wait_time_event, 1);
	/* should never fail */
	WARN_ON_ONCE(ret);

	if (ret) {
 out_clear_te:
		spin_lock_bh(&mvm->time_event_lock);
		iwl_mvm_te_clear_data(mvm, te_data);
		spin_unlock_bh(&mvm->time_event_lock);
	}
	return ret;
J
Johannes Berg 已提交
473 474 475 476
}

void iwl_mvm_protect_session(struct iwl_mvm *mvm,
			     struct ieee80211_vif *vif,
477
			     u32 duration, u32 min_duration,
478
			     u32 max_delay, bool wait_for_notif)
J
Johannes Berg 已提交
479 480 481
{
	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
	struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
482 483
	const u8 te_notif_response[] = { TIME_EVENT_NOTIFICATION };
	struct iwl_notification_wait wait_te_notif;
484
	struct iwl_time_event_cmd time_cmd = {};
J
Johannes Berg 已提交
485 486 487 488

	lockdep_assert_held(&mvm->mutex);

	if (te_data->running &&
489
	    time_after(te_data->end_jiffies, TU_TO_EXP_TIME(min_duration))) {
J
Johannes Berg 已提交
490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516
		IWL_DEBUG_TE(mvm, "We have enough time in the current TE: %u\n",
			     jiffies_to_msecs(te_data->end_jiffies - jiffies));
		return;
	}

	if (te_data->running) {
		IWL_DEBUG_TE(mvm, "extend 0x%x: only %u ms left\n",
			     te_data->uid,
			     jiffies_to_msecs(te_data->end_jiffies - jiffies));
		/*
		 * we don't have enough time
		 * cancel the current TE and issue a new one
		 * Of course it would be better to remove the old one only
		 * when the new one is added, but we don't care if we are off
		 * channel for a bit. All we need to do, is not to return
		 * before we actually begin to be on the channel.
		 */
		iwl_mvm_stop_session_protection(mvm, vif);
	}

	time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
	time_cmd.id_and_color =
		cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
	time_cmd.id = cpu_to_le32(TE_BSS_STA_AGGRESSIVE_ASSOC);

	time_cmd.apply_time =
		cpu_to_le32(iwl_read_prph(mvm->trans, DEVICE_SYSTEM_TIME_REG));
517

518
	time_cmd.max_frags = TE_V2_FRAG_NONE;
519
	time_cmd.max_delay = cpu_to_le32(max_delay);
J
Johannes Berg 已提交
520 521 522
	/* TODO: why do we need to interval = bi if it is not periodic? */
	time_cmd.interval = cpu_to_le32(1);
	time_cmd.duration = cpu_to_le32(duration);
523 524
	time_cmd.repeat = 1;
	time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
525 526
				      TE_V2_NOTIF_HOST_EVENT_END |
				      T2_V2_START_IMMEDIATELY);
J
Johannes Berg 已提交
527

528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549
	if (!wait_for_notif) {
		iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
		return;
	}

	/*
	 * Create notification_wait for the TIME_EVENT_NOTIFICATION to use
	 * right after we send the time event
	 */
	iwl_init_notification_wait(&mvm->notif_wait, &wait_te_notif,
				   te_notif_response,
				   ARRAY_SIZE(te_notif_response),
				   iwl_mvm_te_notif, te_data);

	/* If TE was sent OK - wait for the notification that started */
	if (iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd)) {
		IWL_ERR(mvm, "Failed to add TE to protect session\n");
		iwl_remove_notification(&mvm->notif_wait, &wait_te_notif);
	} else if (iwl_wait_notification(&mvm->notif_wait, &wait_te_notif,
					 TU_TO_JIFFIES(max_delay))) {
		IWL_ERR(mvm, "Failed to protect session until TE\n");
	}
J
Johannes Berg 已提交
550 551 552 553 554 555 556 557 558 559 560
}

/*
 * Explicit request to remove a time event. The removal of a time event needs to
 * be synchronized with the flow of a time event's end notification, which also
 * removes the time event from the op mode data structures.
 */
void iwl_mvm_remove_time_event(struct iwl_mvm *mvm,
			       struct iwl_mvm_vif *mvmvif,
			       struct iwl_mvm_time_event_data *te_data)
{
561
	struct iwl_time_event_cmd time_cmd = {};
J
Johannes Berg 已提交
562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597
	u32 id, uid;
	int ret;

	/*
	 * It is possible that by the time we got to this point the time
	 * event was already removed.
	 */
	spin_lock_bh(&mvm->time_event_lock);

	/* Save time event uid before clearing its data */
	uid = te_data->uid;
	id = te_data->id;

	/*
	 * The clear_data function handles time events that were already removed
	 */
	iwl_mvm_te_clear_data(mvm, te_data);
	spin_unlock_bh(&mvm->time_event_lock);

	/*
	 * It is possible that by the time we try to remove it, the time event
	 * has already ended and removed. In such a case there is no need to
	 * send a removal command.
	 */
	if (id == TE_MAX) {
		IWL_DEBUG_TE(mvm, "TE 0x%x has already ended\n", uid);
		return;
	}

	/* When we remove a TE, the UID is to be set in the id field */
	time_cmd.id = cpu_to_le32(uid);
	time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE);
	time_cmd.id_and_color =
		cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));

	IWL_DEBUG_TE(mvm, "Removing TE 0x%x\n", le32_to_cpu(time_cmd.id));
E
Emmanuel Grumbach 已提交
598
	ret = iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, 0,
599
				   sizeof(time_cmd), &time_cmd);
J
Johannes Berg 已提交
600 601 602 603 604 605 606 607 608 609 610 611 612 613 614
	if (WARN_ON(ret))
		return;
}

void iwl_mvm_stop_session_protection(struct iwl_mvm *mvm,
				     struct ieee80211_vif *vif)
{
	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
	struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;

	lockdep_assert_held(&mvm->mutex);
	iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
}

int iwl_mvm_start_p2p_roc(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
615
			  int duration, enum ieee80211_roc_type type)
J
Johannes Berg 已提交
616 617 618
{
	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
	struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
619
	struct iwl_time_event_cmd time_cmd = {};
J
Johannes Berg 已提交
620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635

	lockdep_assert_held(&mvm->mutex);
	if (te_data->running) {
		IWL_WARN(mvm, "P2P_DEVICE remain on channel already running\n");
		return -EBUSY;
	}

	/*
	 * Flush the done work, just in case it's still pending, so that
	 * the work it does can complete and we can accept new frames.
	 */
	flush_work(&mvm->roc_done_wk);

	time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
	time_cmd.id_and_color =
		cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
636 637 638 639 640 641 642 643 644 645 646 647

	switch (type) {
	case IEEE80211_ROC_TYPE_NORMAL:
		time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_NORMAL);
		break;
	case IEEE80211_ROC_TYPE_MGMT_TX:
		time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_MGMT_TX);
		break;
	default:
		WARN_ONCE(1, "Got an invalid ROC type\n");
		return -EINVAL;
	}
J
Johannes Berg 已提交
648 649 650 651 652

	time_cmd.apply_time = cpu_to_le32(0);
	time_cmd.interval = cpu_to_le32(1);

	/*
653
	 * The P2P Device TEs can have lower priority than other events
J
Johannes Berg 已提交
654
	 * that are being scheduled by the driver/fw, and thus it might not be
655 656
	 * scheduled. To improve the chances of it being scheduled, allow them
	 * to be fragmented, and in addition allow them to be delayed.
J
Johannes Berg 已提交
657
	 */
658
	time_cmd.max_frags = min(MSEC_TO_TU(duration)/50, TE_V2_FRAG_ENDLESS);
J
Johannes Berg 已提交
659 660
	time_cmd.max_delay = cpu_to_le32(MSEC_TO_TU(duration/2));
	time_cmd.duration = cpu_to_le32(MSEC_TO_TU(duration));
661 662
	time_cmd.repeat = 1;
	time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
663 664
				      TE_V2_NOTIF_HOST_EVENT_END |
				      T2_V2_START_IMMEDIATELY);
J
Johannes Berg 已提交
665

666
	return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
J
Johannes Berg 已提交
667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701
}

void iwl_mvm_stop_p2p_roc(struct iwl_mvm *mvm)
{
	struct iwl_mvm_vif *mvmvif;
	struct iwl_mvm_time_event_data *te_data;

	lockdep_assert_held(&mvm->mutex);

	/*
	 * Iterate over the list of time events and find the time event that is
	 * associated with a P2P_DEVICE interface.
	 * This assumes that a P2P_DEVICE interface can have only a single time
	 * event at any given time and this time event coresponds to a ROC
	 * request
	 */
	mvmvif = NULL;
	spin_lock_bh(&mvm->time_event_lock);
	list_for_each_entry(te_data, &mvm->time_event_list, list) {
		if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) {
			mvmvif = iwl_mvm_vif_from_mac80211(te_data->vif);
			break;
		}
	}
	spin_unlock_bh(&mvm->time_event_lock);

	if (!mvmvif) {
		IWL_WARN(mvm, "P2P_DEVICE no remain on channel event\n");
		return;
	}

	iwl_mvm_remove_time_event(mvm, mvmvif, te_data);

	iwl_mvm_roc_finished(mvm);
}
702

703 704 705
int iwl_mvm_schedule_csa_period(struct iwl_mvm *mvm,
				struct ieee80211_vif *vif,
				u32 duration, u32 apply_time)
706 707 708 709 710 711 712 713
{
	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
	struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
	struct iwl_time_event_cmd time_cmd = {};

	lockdep_assert_held(&mvm->mutex);

	if (te_data->running) {
714
		IWL_DEBUG_TE(mvm, "CS period is already scheduled\n");
715 716 717 718 719 720
		return -EBUSY;
	}

	time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
	time_cmd.id_and_color =
		cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
721
	time_cmd.id = cpu_to_le32(TE_CHANNEL_SWITCH_PERIOD);
722 723 724 725 726 727 728 729 730 731
	time_cmd.apply_time = cpu_to_le32(apply_time);
	time_cmd.max_frags = TE_V2_FRAG_NONE;
	time_cmd.duration = cpu_to_le32(duration);
	time_cmd.repeat = 1;
	time_cmd.interval = cpu_to_le32(1);
	time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
				      TE_V2_ABSENCE);

	return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
}