path: root/drivers/net/wireless/intel/iwlwifi/mvm/time-event.c

/******************************************************************************
 *
 * 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
 *
 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
 * Copyright(c) 2017 Intel Deutschland GmbH
 * Copyright(c) 2012 - 2014, 2018 - 2020 Intel Corporation
 *
 * 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.
 *
 * The full GNU General Public License is included in this distribution
 * in the file called COPYING.
 *
 * Contact Information:
 *  Intel Linux Wireless <linuxwifi@intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 * BSD LICENSE
 *
 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
 * Copyright(c) 2017 Intel Deutschland GmbH
 * Copyright(c) 2012 - 2014, 2018 - 2020 Intel Corporation
 * 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 "fw/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"

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

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 || !te_data->vif)
		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);

	/*
	 * Clear the ROC_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).
	 */
	clear_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status);

	synchronize_net();

	/*
	 * Flush the offchannel queue -- this is called when the time
	 * event finishes or is canceled, so that frames queued for it
	 * won't get stuck on the queue and be transmitted in the next
	 * time event.
	 */

	mutex_lock(&mvm->mutex);
	if (test_and_clear_bit(IWL_MVM_STATUS_NEED_FLUSH_P2P, &mvm->status)) {
		struct iwl_mvm_vif *mvmvif;

		/*
		 * NB: access to this pointer would be racy, but the flush bit
		 * can only be set when we had a P2P-Device VIF, and we have a
		 * flush of this work in iwl_mvm_prepare_mac_removal() so it's
		 * not really racy.
		 */

		if (!WARN_ON(!mvm->p2p_device_vif)) {
			mvmvif = iwl_mvm_vif_from_mac80211(mvm->p2p_device_vif);
			iwl_mvm_flush_sta(mvm, &mvmvif->bcast_sta, true);
		}
	}

	/*
	 * Clear the 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_AUX_RUNNING, &mvm->status)) {
		/* do the same in case of hot spot 2.0 */
		iwl_mvm_flush_sta(mvm, &mvm->aux_sta, true);

		/* In newer version of this command an aux station is added only
		 * in cases of dedicated tx queue and need to be removed in end
		 * of use */
		if (iwl_fw_lookup_cmd_ver(mvm->fw, LONG_GROUP,
					  ADD_STA, 0) >= 12)
			iwl_mvm_rm_aux_sta(mvm);
	}

	mutex_unlock(&mvm->mutex);
}

static void iwl_mvm_roc_finished(struct iwl_mvm *mvm)
{
	/*