drivers/net/wireless/iwlwifi/mvm/ops.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) 2012 - 2014 Intel Corporation. All rights reserved.
 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
 *
 * 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
 * in the file called COPYING.
 *
 * Contact Information:
 *  Intel Linux Wireless <ilw@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 * BSD LICENSE
 *
 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
 * 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/module.h>
#include <linux/vmalloc.h>
#include <net/mac80211.h>

#include "iwl-notif-wait.h"
#include "iwl-trans.h"
#include "iwl-op-mode.h"
#include "iwl-fw.h"
#include "iwl-debug.h"
#include "iwl-drv.h"
#include "iwl-modparams.h"
#include "mvm.h"
#include "iwl-phy-db.h"
#include "iwl-eeprom-parse.h"
#include "iwl-csr.h"
#include "iwl-io.h"
#include "iwl-prph.h"
#include "rs.h"
#include "fw-api-scan.h"
#include "time-event.h"
#include "iwl-fw-error-dump.h"

#define DRV_DESCRIPTION	"The new Intel(R) wireless AGN driver for Linux"
MODULE_DESCRIPTION(DRV_DESCRIPTION);
MODULE_AUTHOR(DRV_COPYRIGHT " " DRV_AUTHOR);
MODULE_LICENSE("GPL");

static const struct iwl_op_mode_ops iwl_mvm_ops;

struct iwl_mvm_mod_params iwlmvm_mod_params = {
	.power_scheme = IWL_POWER_SCHEME_BPS,
	/* rest of fields are 0 by default */
};

module_param_named(init_dbg, iwlmvm_mod_params.init_dbg, bool, S_IRUGO);
MODULE_PARM_DESC(init_dbg,
		 "set to true to debug an ASSERT in INIT fw (default: false");
module_param_named(power_scheme, iwlmvm_mod_params.power_scheme, int, S_IRUGO);
MODULE_PARM_DESC(power_scheme,
		 "power management scheme: 1-active, 2-balanced, 3-low power, default: 2");

/*
 * module init and exit functions
 */
static int __init iwl_mvm_init(void)
{
	int ret;

	ret = iwl_mvm_rate_control_register();
	if (ret) {
		pr_err("Unable to register rate control algorithm: %d\n", ret);
		return ret;
	}

	ret = iwl_opmode_register("iwlmvm", &iwl_mvm_ops);

	if (ret) {
		pr_err("Unable to register MVM op_mode: %d\n", ret);
		iwl_mvm_rate_control_unregister();
	}

	return ret;
}
module_init(iwl_mvm_init);

static void __exit iwl_mvm_exit(void)
{
	iwl_opmode_deregister("iwlmvm");
	iwl_mvm_rate_control_unregister();
}
module_exit(iwl_mvm_exit);

static void iwl_mvm_nic_config(struct iwl_op_mode *op_mode)
{
	struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
	u8 radio_cfg_type, radio_cfg_step, radio_cfg_dash;
	u32 reg_val = 0;
	u32 phy_config = iwl_mvm_get_phy_config(mvm);

	radio_cfg_type = (phy_config & FW_PHY_CFG_RADIO_TYPE) >>
			 FW_PHY_CFG_RADIO_TYPE_POS;
	radio_cfg_step = (phy_config & FW_PHY_CFG_RADIO_STEP) >>
			 FW_PHY_CFG_RADIO_STEP_POS;
	radio_cfg_dash = (phy_config & FW_PHY_CFG_RADIO_DASH) >>
			 FW_PHY_CFG_RADIO_DASH_POS;

	/* SKU control */
	reg_val |= CSR_HW_REV_STEP(mvm->trans->hw_rev) <<
				CSR_HW_IF_CONFIG_REG_POS_MAC_STEP;
	reg_val |= CSR_HW_REV_DASH(mvm->trans->hw_rev) <<
				CSR_HW_IF_CONFIG_REG_POS_MAC_DASH;

	/* radio configuration */
	reg_val |= radio_cfg_type << CSR_HW_IF_CONFIG_REG_POS_PHY_TYPE;
	reg_val |= radio_cfg_step << CSR_HW_IF_CONFIG_REG_POS_PHY_STEP;
	reg_val |= radio_cfg_dash << CSR_HW_IF_CONFIG_REG_POS_PHY_DASH;

	WARN_ON((radio_cfg_type << CSR_HW_IF_CONFIG_REG_POS_PHY_TYPE) &
		 ~CSR_HW_IF_CONFIG_REG_MSK_PHY_TYPE);

	/*
	 * TODO: Bits 7-8 of CSR in 8000 HW family set the ADC sampling, and
	 * shouldn't be set to any non-zero value. The same is supposed to be
	 * true of the other HW, but unsetting them (such as the 7260) causes
	 * automatic tests to fail on seemingly unrelated errors. Need to
	 * further investigate this, but for now we'll separate cases.
	 */
	if (mvm->trans->cfg->device_family != IWL_DEVICE_FAMILY_8000)
		reg_val |= CSR_HW_IF_CONFIG_REG_BIT_RADIO_SI;

	iwl_trans_set_bits_mask(mvm->trans, CSR_HW_IF_CONFIG_REG,
				CSR_HW_IF_CONFIG_REG_MSK_MAC_DASH |
				CSR_HW_IF_CONFIG_REG_MSK_MAC_STEP |
				CSR_HW_IF_CONFIG_REG_MSK_PHY_TYPE |
				CSR_HW_IF_CONFIG_REG_MSK_PHY_STEP |
				CSR_HW_IF_CONFIG_REG_MSK_PHY_DASH |
				CSR_HW_IF_CONFIG_REG_BIT_RADIO_SI |
				CSR_HW_IF_CONFIG_REG_BIT_MAC_SI,
				reg_val);

	IWL_DEBUG_INFO(mvm, "Radio type=0x%x-0x%x-0x%x\n", radio_cfg_type,
		       radio_cfg_step, radio_cfg_dash);

	/*
	 * W/A : NIC is stuck in a reset state after Early PCIe power off
	 * (PCIe power is lost before PERST# is asserted), causing ME FW
	 * to lose ownership and not being able to obtain it back.
	 */
	if (mvm->trans->cfg->device_family != IWL_DEVICE_FAMILY_8000)
		iwl_set_bits_mask_prph(mvm->trans, APMG_PS_CTRL_REG,
				       APMG_PS_CTRL_EARLY_PWR_OFF_RESET_DIS,
				       ~APMG_PS_CTRL_EARLY_PWR_OFF_RESET_DIS);
}

struct iwl_rx_handlers {
	u8 cmd_id;
	bool async;
	int (*fn)(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
		  struct iwl_device_cmd *cmd);
};

#define RX_HANDLER(_cmd_id, _fn, _async)	\
	{ .cmd_id = _cmd_id , .fn = _fn , .async = _async }

/*
 * Handlers for fw notifications
 * Convention: RX_HANDLER(CMD_NAME, iwl_mvm_rx_CMD_NAME
 * This list should be in order of frequency for performance purposes.
 *
 * The handler can be SYNC - this means that it will be called in the Rx path
 * which can't acquire mvm->mutex. If the handler needs to hold mvm->mutex (and
 * only in this case!), it should be set as ASYNC. In that case, it will be
 * called from a worker with mvm->mutex held.
 */
static const struct iwl_rx_handlers iwl_mvm_rx_handlers[] = {
	RX_HANDLER(REPLY_RX_MPDU_CMD, iwl_mvm_rx_rx_mpdu, false),
	RX_HANDLER(REPLY_RX_PHY_CMD, iwl_mvm_rx_rx_phy_cmd, false),
	RX_HANDLER(TX_CMD, iwl_mvm_rx_tx_cmd, false),
	RX_HANDLER(BA_NOTIF, iwl_mvm_rx_ba_notif, false),

	RX_HANDLER(BT_PROFILE_NOTIFICATION, iwl_mvm_rx_bt_coex_notif, true),
	RX_HANDLER(BEACON_NOTIFICATION, iwl_mvm_rx_beacon_notif, true),
	RX_HANDLER(STATISTICS_NOTIFICATION, iwl_mvm_rx_statistics, true),
	RX_HANDLER(ANTENNA_COUPLING_NOTIFICATION,
		   iwl_mvm_rx_ant_coupling_notif, true),

	RX_HANDLER(TIME_EVENT_NOTIFICATION, iwl_mvm_rx_time_event_notif, false),

	RX_HANDLER(EOSP_NOTIFICATION, iwl_mvm_rx_eosp_notif, false),

	RX_HANDLER(SCAN_REQUEST_CMD, iwl_mvm_rx_scan_response, false),
	RX_HANDLER(SCAN_COMPLETE_NOTIFICATION, iwl_mvm_rx_scan_complete, true),
	RX_HANDLER(SCAN_OFFLOAD_COMPLETE,
		   iwl_mvm_rx_scan_offload_complete_notif, true),
	RX_HANDLER(MATCH_FOUND_NOTIFICATION, iwl_mvm_rx_scan_offload_results,
		   false),
	RX_HANDLER(SCAN_COMPLETE_UMAC, iwl_mvm_rx_umac_scan_complete_notif,
		   true),

	RX_HANDLER(RADIO_VERSION_NOTIFICATION, iwl_mvm_rx_radio_ver, false),
	RX_HANDLER(CARD_STATE_NOTIFICATION, iwl_mvm_rx_card_state_notif, false),

	RX_HANDLER(MISSED_BEACONS_NOTIFICATION, iwl_mvm_rx_missed_beacons_notif,
		   false),

	RX_HANDLER(REPLY_ERROR, iwl_mvm_rx_fw_error, false),
	RX_HANDLER(PSM_UAPSD_AP_MISBEHAVING_NOTIFICATION,
		   iwl_mvm_power_uapsd_misbehaving_ap_notif, false),
	RX_HANDLER(DTS_MEASUREMENT_NOTIFICATION, iwl_mvm_temp_notif, true),

	RX_HANDLER(TDLS_CHANNEL_SWITCH_NOTIFICATION, iwl_mvm_rx_tdls_notif,
		   true),
	RX_HANDLER(MFUART_LOAD_NOTIFICATION, iwl_mvm_rx_mfuart_notif, false),

};
#undef RX_HANDLER
#define CMD(x) [x] = #x

static const char *const iwl_mvm_cmd_strings[REPLY_MAX] = {
	CMD(MVM_ALIVE),
	CMD(REPLY_ERROR),
	CMD(INIT_COMPLETE_NOTIF),
	CMD(PHY_CONTEXT_CMD),
	CMD(MGMT_MCAST_KEY),
	CMD(TX_CMD),
	CMD(TXPATH_FLUSH),
	CMD(MAC_CONTEXT_CMD),
	CMD(TIME_EVENT_CMD),
	CMD(TIME_EVENT_NOTIFICATION),
	CMD(BINDING_CONTEXT_CMD),
	CMD(TIME_QUOTA_CMD),
	CMD(NON_QOS_TX_COUNTER_CMD),
	CMD(RADIO_VERSION_NOTIFICATION),
	CMD(SCAN_REQUEST_CMD),
	CMD(SCAN_ABORT_CMD),
	CMD(SCAN_START_NOTIFICATION),
	CMD(SCAN_RESULTS_NOTIFICATION),
	CMD(SCAN_COMPLETE_NOTIFICATION),
	CMD(NVM_ACCESS_CMD),
	CMD(PHY_CONFIGURATION_CMD),
	CMD(CALIB_RES_NOTIF_PHY_DB),
	CMD(SET_CALIB_DEFAULT_CMD),
	CMD(CALIBRATION_COMPLETE_NOTIFICATION),
	CMD(ADD_STA_KEY),
	CMD(ADD_STA),
	CMD(REMOVE_STA),
	CMD(LQ_CMD),
	CMD(SCAN_OFFLOAD_CONFIG_CMD),
	CMD(MATCH_FOUND_NOTIFICATION),
	CMD(SCAN_OFFLOAD_REQUEST_CMD),
	CMD(SCAN_OFFLOAD_ABORT_CMD),
	CMD(HOT_SPOT_CMD),
	CMD(SCAN_OFFLOAD_COMPLETE),
	CMD(SCAN_OFFLOAD_UPDATE_PROFILES_CMD),
	CMD(SCAN_ITERATION_COMPLETE),
	CMD(POWER_TABLE_CMD),
	CMD(WEP_KEY),
	CMD(REPLY_RX_PHY_CMD),
	CMD(REPLY_RX_MPDU_CMD),
	CMD(BEACON_NOTIFICATION),
	CMD(BEACON_TEMPLATE_CMD),
	CMD(STATISTICS_NOTIFICATION),
	CMD(EOSP_NOTIFICATION),
	CMD(REDUCE_TX_POWER_CMD),
	CMD(TX_ANT_CONFIGURATION_CMD),
	CMD(D3_CONFIG_CMD),
	CMD(D0I3_END_CMD),
	CMD(PROT_OFFLOAD_CONFIG_CMD),
	CMD(OFFLOADS_QUERY_CMD),
	CMD(REMOTE_WAKE_CONFIG_CMD),
	CMD(WOWLAN_PATTERNS),
	CMD(WOWLAN_CONFIGURATION),
	CMD(WOWLAN_TSC_RSC_PARAM),
	CMD(WOWLAN_TKIP_PARAM),
	CMD(WOWLAN_KEK_KCK_MATERIAL),
	CMD(WOWLAN_GET_STATUSES),
	CMD(WOWLAN_TX_POWER_PER_DB),
	CMD(SCAN_OFFLOAD_PROFILES_QUERY_CMD),
	CMD(SCAN_OFFLOAD_HOTSPOTS_CONFIG_CMD),
	CMD(SCAN_OFFLOAD_HOTSPOTS_QUERY_CMD),
	CMD(CARD_STATE_NOTIFICATION),
	CMD(MISSED_BEACONS_NOTIFICATION),
	CMD(BT_COEX_PRIO_TABLE),
	CMD(BT_COEX_PROT_ENV),
	CMD(BT_PROFILE_NOTIFICATION),
	CMD(BT_CONFIG),
	CMD(MCAST_FILTER_CMD),
	CMD(BCAST_FILTER_CMD),
	CMD(REPLY_SF_CFG_CMD),
	CMD(REPLY_BEACON_FILTERING_CMD),
	CMD(CMD_DTS_MEASUREMENT_TRIGGER),
	CMD(DTS_MEASUREMENT_NOTIFICATION),
	CMD(REPLY_THERMAL_MNG_BACKOFF),
	CMD(MAC_PM_POWER_TABLE),
	CMD(LTR_CONFIG),
	CMD(BT_COEX_CI),
	CMD(BT_COEX_UPDATE_SW_BOOST),
	CMD(BT_COEX_UPDATE_CORUN_LUT),
	CMD(BT_COEX_UPDATE_REDUCED_TXP),
	CMD(PSM_UAPSD_AP_MISBEHAVING_NOTIFICATION),
	CMD(ANTENNA_COUPLING_NOTIFICATION),
	CMD(SCD_QUEUE_CFG),
	CMD(SCAN_CFG_CMD),
	CMD(SCAN_REQ_UMAC),
	CMD(SCAN_ABORT_UMAC),
	CMD(SCAN_COMPLETE_UMAC),
	CMD(TDLS_CHANNEL_SWITCH_CMD),
	CMD(TDLS_CHANNEL_SWITCH_NOTIFICATION),
	CMD(TDLS_CONFIG_CMD),
};
#undef CMD

/* this forward declaration can avoid to export the function */
static void iwl_mvm_async_handlers_wk(struct work_struct *wk);
static void iwl_mvm_d0i3_exit_work(struct work_struct *wk);

static u32 calc_min_backoff(struct iwl_trans *trans, const struct iwl_cfg *cfg)
{
	const struct iwl_pwr_tx_backoff *pwr_tx_backoff = cfg->pwr_tx_backoffs;

	if (!pwr_tx_backoff)
		return 0;

	while (pwr_tx_backoff->pwr) {
		if (trans->dflt_pwr_limit >= pwr_tx_backoff->pwr)
			return pwr_tx_backoff->backoff;

		pwr_tx_backoff++;
	}

	return 0;
}

static void iwl_mvm_fw_error_dump_wk(struct work_struct *work);

static struct iwl_op_mode *
iwl_op_mode_mvm_start(struct iwl_trans *trans, const struct iwl_cfg *cfg,
		      const struct iwl_fw *fw, struct dentry *dbgfs_dir)
{
	struct ieee80211_hw *hw;
	struct iwl_op_mode *op_mode;
	struct iwl_mvm *mvm;
	struct iwl_trans_config trans_cfg = {};
	static const u8 no_reclaim_cmds[] = {
		TX_CMD,
	};
	int err, scan_size;
	u32 min_backoff;

	/*
	 * We use IWL_MVM_STATION_COUNT to check the validity of the station
	 * index all over the driver - check that its value corresponds to the
	 * array size.
	 */
	BUILD_BUG_ON(ARRAY_SIZE(mvm->fw_id_to_mac_id) != IWL_MVM_STATION_COUNT);

	/********************************
	 * 1. Allocating and configuring HW data
	 ********************************/
	hw = ieee80211_alloc_hw(sizeof(struct iwl_op_mode) +
				sizeof(struct iwl_mvm),
				&iwl_mvm_hw_ops);
	if (!hw)
		return NULL;

	if (cfg->max_rx_agg_size)
		hw->max_rx_aggregation_subframes = cfg->max_rx_agg_size;

	if (cfg->max_tx_agg_size)
		hw->max_tx_aggregation_subframes = cfg->max_tx_agg_size;

	op_mode = hw->priv;
	op_mode->ops = &iwl_mvm_ops;

	mvm = IWL_OP_MODE_GET_MVM(op_mode);
	mvm->dev = trans->dev;
	mvm->trans = trans;
	mvm->cfg = cfg;
	mvm->fw = fw;
	mvm->hw = hw;

	mvm->restart_fw = iwlwifi_mod_params.restart_fw ? -1 : 0;

	mvm->aux_queue = 15;
	mvm->first_agg_queue = 16;
	mvm->last_agg_queue = mvm->cfg->base_params->num_of_queues - 1;
	if (mvm->cfg->base_params->num_of_queues == 16) {
		mvm->aux_queue = 11;
		mvm->first_agg_queue = 12;
	}
	mvm->sf_state = SF_UNINIT;
	mvm->low_latency_agg_frame_limit = 6;
	mvm->cur_ucode = IWL_UCODE_INIT;

	mutex_init(&mvm->mutex);
	mutex_init(&mvm->d0i3_suspend_mutex);
	spin_lock_init(&mvm->async_handlers_lock);
	INIT_LIST_HEAD(&mvm->time_event_list);
	INIT_LIST_HEAD(&mvm->aux_roc_te_list);
	INIT_LIST_HEAD(&mvm->async_handlers_list);
	spin_lock_init(&mvm->time_event_lock);

	INIT_WORK(&mvm->async_handlers_wk, iwl_mvm_async_handlers_wk);
	INIT_WORK(&mvm->roc_done_wk, iwl_mvm_roc_done_wk);
	INIT_WORK(&mvm->sta_drained_wk, iwl_mvm_sta_drained_wk);
	INIT_WORK(&mvm->d0i3_exit_work, iwl_mvm_d0i3_exit_work);
	INIT_WORK(&mvm->fw_error_dump_wk, iwl_mvm_fw_error_dump_wk);
	INIT_DELAYED_WORK(&mvm->tdls_cs.dwork, iwl_mvm_tdls_ch_switch_work);

	spin_lock_init(&mvm->d0i3_tx_lock);
	spin_lock_init(&mvm->refs_lock);
	skb_queue_head_init(&mvm->d0i3_tx);
	init_waitqueue_head(&mvm->d0i3_exit_waitq);

	SET_IEEE80211_DEV(mvm->hw, mvm->trans->dev);

	/*
	 * Populate the state variables that the transport layer needs
	 * to know about.
	 */
	trans_cfg.op_mode = op_mode;
	trans_cfg.no_reclaim_cmds = no_reclaim_cmds;
	trans_cfg.n_no_reclaim_cmds = ARRAY_SIZE(no_reclaim_cmds);
	trans_cfg.rx_buf_size_8k = iwlwifi_mod_params.amsdu_size_8K;

	if (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_DW_BC_TABLE)
		trans_cfg.bc_table_dword = true;

	if (!iwlwifi_mod_params.wd_disable)
		trans_cfg.queue_watchdog_timeout = cfg->base_params->wd_timeout;
	else
		trans_cfg.queue_watchdog_timeout = IWL_WATCHDOG_DISABLED;

	trans_cfg.command_names = iwl_mvm_cmd_strings;

	trans_cfg.cmd_queue = IWL_MVM_CMD_QUEUE;
	trans_cfg.cmd_fifo = IWL_MVM_TX_FIFO_CMD;
	trans_cfg.scd_set_active = true;

	trans_cfg.sdio_adma_addr = fw->sdio_adma_addr;

	snprintf(mvm->hw->wiphy->fw_version,
		 sizeof(mvm->hw->wiphy->fw_version),
		 "%s", fw->fw_version);

	/* Configure transport layer */
	iwl_trans_configure(mvm->trans, &trans_cfg);

	trans->rx_mpdu_cmd = REPLY_RX_MPDU_CMD;
	trans->rx_mpdu_cmd_hdr_size = sizeof(struct iwl_rx_mpdu_res_start);
	trans->dbg_dest_tlv = mvm->fw->dbg_dest_tlv;
	trans->dbg_dest_reg_num = mvm->fw->dbg_dest_reg_num;
	memcpy(trans->dbg_conf_tlv, mvm->fw->dbg_conf_tlv,
	       sizeof(trans->dbg_conf_tlv));

	/* set up notification wait support */
	iwl_notification_wait_init(&mvm->notif_wait);

	/* Init phy db */
	mvm->phy_db = iwl_phy_db_init(trans);
	if (!mvm->phy_db) {
		IWL_ERR(mvm, "Cannot init phy_db\n");
		goto out_free;
	}

	IWL_INFO(mvm, "Detected %s, REV=0x%X\n",
		 mvm->cfg->name, mvm->trans->hw_rev);

	min_backoff = calc_min_backoff(trans, cfg);
	iwl_mvm_tt_initialize(mvm, min_backoff);
	/* set the nvm_file_name according to priority */
	if (iwlwifi_mod_params.nvm_file) {
		mvm->nvm_file_name = iwlwifi_mod_params.nvm_file;
	} else {
		if ((trans->cfg->device_family == IWL_DEVICE_FAMILY_8000) &&
		    (CSR_HW_REV_STEP(trans->hw_rev) == SILICON_A_STEP))
			mvm->nvm_file_name = mvm->cfg->default_nvm_file_8000A;
		else
			mvm->nvm_file_name = mvm->cfg->default_nvm_file;
	}

	if (WARN(cfg->no_power_up_nic_in_init && !mvm->nvm_file_name,
		 "not allowing power-up and not having nvm_file\n"))
		goto out_free;

	/*
	 * Even if nvm exists in the nvm_file driver should read again the nvm
	 * from the nic because there might be entries that exist in the OTP
	 * and not in the file.
	 * for nics with no_power_up_nic_in_init: rely completley on nvm_file
	 */
	if (cfg->no_power_up_nic_in_init && mvm->nvm_file_name) {
		err = iwl_nvm_init(mvm, false);
		if (err)
			goto out_free;
	} else {
		err = iwl_trans_start_hw(mvm->trans);
		if (err)
			goto out_free;

		mutex_lock(&mvm->mutex);
		err = iwl_run_init_mvm_ucode(mvm, true);
		if (!err || !iwlmvm_mod_params.init_dbg)
			iwl_trans_stop_device(trans);
		mutex_unlock(&mvm->mutex);
		/* returns 0 if successful, 1 if success but in rfkill */
		if (err < 0 && !iwlmvm_mod_params.init_dbg) {
			IWL_ERR(mvm, "Failed to run INIT ucode: %d\n", err);
			goto out_free;
		}
	}

	scan_size = iwl_mvm_scan_size(mvm);

	mvm->scan_cmd = kmalloc(scan_size, GFP_KERNEL);
	if (!mvm->scan_cmd)
		goto out_free;

	err = iwl_mvm_mac_setup_register(mvm);
	if (err)
		goto out_free;

	err = iwl_mvm_dbgfs_register(mvm, dbgfs_dir);
	if (err)
		goto out_unregister;

	memset(&mvm->rx_stats, 0, sizeof(struct mvm_statistics_rx));

	/* rpm starts with a taken ref. only set the appropriate bit here. */
	mvm->refs[IWL_MVM_REF_UCODE_DOWN] = 1;

	return op_mode;

 out_unregister:
	ieee80211_unregister_hw(mvm->hw);
	iwl_mvm_leds_exit(mvm);
 out_free:
	iwl_phy_db_free(mvm->phy_db);
	kfree(mvm->scan_cmd);
	if (!cfg->no_power_up_nic_in_init || !mvm->nvm_file_name)
		iwl_trans_op_mode_leave(trans);
	ieee80211_free_hw(mvm->hw);
	return NULL;
}

static void iwl_op_mode_mvm_stop(struct iwl_op_mode *op_mode)
{
	struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
	int i;

	iwl_mvm_leds_exit(mvm);

	iwl_mvm_tt_exit(mvm);

	ieee80211_unregister_hw(mvm->hw);

	kfree(mvm->scan_cmd);
	kfree(mvm->mcast_filter_cmd);
	mvm->mcast_filter_cmd = NULL;

#if defined(CONFIG_PM_SLEEP) && defined(CONFIG_IWLWIFI_DEBUGFS)
	kfree(mvm->d3_resume_sram);
	if (mvm->nd_config) {
		kfree(mvm->nd_config->match_sets);
		kfree(mvm->nd_config);
		mvm->nd_config = NULL;
	}
#endif

	iwl_trans_op_mode_leave(mvm->trans);

	iwl_phy_db_free(mvm->phy_db);
	mvm->phy_db = NULL;

	iwl_free_nvm_data(mvm->nvm_data);
	for (i = 0; i < NVM_MAX_NUM_SECTIONS; i++)
		kfree(mvm->nvm_sections[i].data);

	ieee80211_free_hw(mvm->hw);
}

struct iwl_async_handler_entry {
	struct list_head list;
	struct iwl_rx_cmd_buffer rxb;
	int (*fn)(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
		  struct iwl_device_cmd *cmd);
};

void iwl_mvm_async_handlers_purge(struct iwl_mvm *mvm)
{
	struct iwl_async_handler_entry *entry, *tmp;

	spin_lock_bh(&mvm->async_handlers_lock);
	list_for_each_entry_safe(entry, tmp, &mvm->async_handlers_list, list) {
		iwl_free_rxb(&entry->rxb);
		list_del(&entry->list);
		kfree(entry);
	}
	spin_unlock_bh(&mvm->async_handlers_lock);
}

static void iwl_mvm_async_handlers_wk(struct work_struct *wk)
{
	struct iwl_mvm *mvm =
		container_of(wk, struct iwl_mvm, async_handlers_wk);
	struct iwl_async_handler_entry *entry, *tmp;
	struct list_head local_list;

	INIT_LIST_HEAD(&local_list);

	/* Ensure that we are not in stop flow (check iwl_mvm_mac_stop) */
	mutex_lock(&mvm->mutex);

	/*
	 * Sync with Rx path with a lock. Remove all the entries from this list,
	 * add them to a local one (lock free), and then handle them.
	 */
	spin_lock_bh(&mvm->async_handlers_lock);
	list_splice_init(&mvm->async_handlers_list, &local_list);
	spin_unlock_bh(&mvm->async_handlers_lock);

	list_for_each_entry_safe(entry, tmp, &local_list, list) {
		if (entry->fn(mvm, &entry->rxb, NULL))
			IWL_WARN(mvm,
				 "returned value from ASYNC handlers are ignored\n");
		iwl_free_rxb(&entry->rxb);
		list_del(&entry->list);
		kfree(entry);
	}
	mutex_unlock(&mvm->mutex);
}

static int iwl_mvm_rx_dispatch(struct iwl_op_mode *op_mode,
			       struct iwl_rx_cmd_buffer *rxb,
			       struct iwl_device_cmd *cmd)
{
	struct iwl_rx_packet *pkt = rxb_addr(rxb);
	struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
	u8 i;

	/*
	 * Do the notification wait before RX handlers so
	 * even if the RX handler consumes the RXB we have
	 * access to it in the notification wait entry.
	 */
	iwl_notification_wait_notify(&mvm->notif_wait, pkt);

	for (i = 0; i < ARRAY_SIZE(iwl_mvm_rx_handlers); i++) {
		const struct iwl_rx_handlers *rx_h = &iwl_mvm_rx_handlers[i];
		struct iwl_async_handler_entry *entry;

		if (rx_h->cmd_id != pkt->hdr.cmd)
			continue;

		if (!rx_h->async)
			return rx_h->fn(mvm, rxb, cmd);

		entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
		/* we can't do much... */
		if (!entry)
			return 0;

		entry->rxb._page = rxb_steal_page(rxb);
		entry->rxb._offset = rxb->_offset;
		entry->rxb._rx_page_order = rxb->_rx_page_order;
		entry->fn = rx_h->fn;
		spin_lock(&mvm->async_handlers_lock);
		list_add_tail(&entry->list, &mvm->async_handlers_list);
		spin_unlock(&mvm->async_handlers_lock);
		schedule_work(&mvm->async_handlers_wk);
		break;
	}

	return 0;
}

static void iwl_mvm_stop_sw_queue(struct iwl_op_mode *op_mode, int queue)
{
	struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
	int mq = mvm->queue_to_mac80211[queue];

	if (WARN_ON_ONCE(mq == IWL_INVALID_MAC80211_QUEUE))
		return;

	if (atomic_inc_return(&mvm->mac80211_queue_stop_count[mq]) > 1) {
		IWL_DEBUG_TX_QUEUES(mvm,
				    "queue %d (mac80211 %d) already stopped\n",
				    queue, mq);
		return;
	}

	ieee80211_stop_queue(mvm->hw, mq);
}

static void iwl_mvm_wake_sw_queue(struct iwl_op_mode *op_mode, int queue)
{
	struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
	int mq = mvm->queue_to_mac80211[queue];

	if (WARN_ON_ONCE(mq == IWL_INVALID_MAC80211_QUEUE))
		return;

	if (atomic_dec_return(&mvm->mac80211_queue_stop_count[mq]) > 0) {
		IWL_DEBUG_TX_QUEUES(mvm,
				    "queue %d (mac80211 %d) still stopped\n",
				    queue, mq);
		return;
	}

	ieee80211_wake_queue(mvm->hw, mq);
}

void iwl_mvm_set_hw_ctkill_state(struct iwl_mvm *mvm, bool state)
{
	if (state)
		set_bit(IWL_MVM_STATUS_HW_CTKILL, &mvm->status);
	else
		clear_bit(IWL_MVM_STATUS_HW_CTKILL, &mvm->status);

	wiphy_rfkill_set_hw_state(mvm->hw->wiphy, iwl_mvm_is_radio_killed(mvm));
}

static bool iwl_mvm_set_hw_rfkill_state(struct iwl_op_mode *op_mode, bool state)
{
	struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
	bool calibrating = ACCESS_ONCE(mvm->calibrating);

	if (state)
		set_bit(IWL_MVM_STATUS_HW_RFKILL, &mvm->status);
	else
		clear_bit(IWL_MVM_STATUS_HW_RFKILL, &mvm->status);

	wiphy_rfkill_set_hw_state(mvm->hw->wiphy, iwl_mvm_is_radio_killed(mvm));

	/* iwl_run_init_mvm_ucode is waiting for results, abort it */
	if (calibrating)
		iwl_abort_notification_waits(&mvm->notif_wait);

	/*
	 * Stop the device if we run OPERATIONAL firmware or if we are in the
	 * middle of the calibrations.
	 */
	return state && (mvm->cur_ucode != IWL_UCODE_INIT || calibrating);
}

static void iwl_mvm_free_skb(struct iwl_op_mode *op_mode, struct sk_buff *skb)
{
	struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
	struct ieee80211_tx_info *info;

	info = IEEE80211_SKB_CB(skb);
	iwl_trans_free_tx_cmd(mvm->trans, info->driver_data[1]);
	ieee80211_free_txskb(mvm->hw, skb);
}

struct iwl_mvm_reprobe {
	struct device *dev;
	struct work_struct work;
};

static void iwl_mvm_reprobe_wk(struct work_struct *wk)
{
	struct iwl_mvm_reprobe *reprobe;

	reprobe = container_of(wk, struct iwl_mvm_reprobe, work);
	if (device_reprobe(reprobe->dev))
		dev_err(reprobe->dev, "reprobe failed!\n");
	kfree(reprobe);
	module_put(THIS_MODULE);
}

static void iwl_mvm_fw_error_dump_wk(struct work_struct *work)
{
	struct iwl_mvm *mvm =
		container_of(work, struct iwl_mvm, fw_error_dump_wk);

	mutex_lock(&mvm->mutex);
	iwl_mvm_fw_error_dump(mvm);
	mutex_unlock(&mvm->mutex);
}

void iwl_mvm_nic_restart(struct iwl_mvm *mvm, bool fw_error)
{
	iwl_abort_notification_waits(&mvm->notif_wait);

	/*
	 * This is a bit racy, but worst case we tell mac80211 about
	 * a stopped/aborted scan when that was already done which
	 * is not a problem. It is necessary to abort any os scan
	 * here because mac80211 requires having the scan cleared
	 * before restarting.
	 * We'll reset the scan_status to NONE in restart cleanup in
	 * the next start() call from mac80211. If restart isn't called
	 * (no fw restart) scan status will stay busy.
	 */
	switch (mvm->scan_status) {
	case IWL_MVM_SCAN_NONE:
		break;
	case IWL_MVM_SCAN_OS:
		ieee80211_scan_completed(mvm->hw, true);
		break;
	case IWL_MVM_SCAN_SCHED:
		/* Sched scan will be restarted by mac80211 in restart_hw. */
		if (!mvm->restart_fw)
			ieee80211_sched_scan_stopped(mvm->hw);
		break;
	}

	/*
	 * If we're restarting already, don't cycle restarts.
	 * If INIT fw asserted, it will likely fail again.
	 * If WoWLAN fw asserted, don't restart either, mac80211
	 * can't recover this since we're already half suspended.
	 */
	if (test_and_set_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status)) {
		struct iwl_mvm_reprobe *reprobe;

		IWL_ERR(mvm,
			"Firmware error during reconfiguration - reprobe!\n");

		/*
		 * get a module reference to avoid doing this while unloading
		 * anyway and to avoid scheduling a work with code that's
		 * being removed.
		 */
		if (!try_module_get(THIS_MODULE)) {
			IWL_ERR(mvm, "Module is being unloaded - abort\n");
			return;
		}

		reprobe = kzalloc(sizeof(*reprobe), GFP_ATOMIC);
		if (!reprobe) {
			module_put(THIS_MODULE);
			return;
		}
		reprobe->dev = mvm->trans->dev;
		INIT_WORK(&reprobe->work, iwl_mvm_reprobe_wk);
		schedule_work(&reprobe->work);
	} else if (mvm->cur_ucode == IWL_UCODE_REGULAR &&
		   (!fw_error || mvm->restart_fw)) {
		/* don't let the transport/FW power down */
		iwl_mvm_ref(mvm, IWL_MVM_REF_UCODE_DOWN);

		if (fw_error && mvm->restart_fw > 0)
			mvm->restart_fw--;
		ieee80211_restart_hw(mvm->hw);
	} else if (fw_error) {
		schedule_work(&mvm->fw_error_dump_wk);
	}
}

static void iwl_mvm_nic_error(struct iwl_op_mode *op_mode)
{
	struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);

	iwl_mvm_dump_nic_error_log(mvm);

	iwl_mvm_nic_restart(mvm, true);
}

static void iwl_mvm_cmd_queue_full(struct iwl_op_mode *op_mode)
{
	struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);

	WARN_ON(1);
	iwl_mvm_nic_restart(mvm, true);
}

struct iwl_d0i3_iter_data {
	struct iwl_mvm *mvm;
	u8 ap_sta_id;
	u8 vif_count;
	u8 offloading_tid;
	bool disable_offloading;
};

static bool iwl_mvm_disallow_offloading(struct iwl_mvm *mvm,
					struct ieee80211_vif *vif,
					struct iwl_d0i3_iter_data *iter_data)
{
	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
	struct ieee80211_sta *ap_sta;
	struct iwl_mvm_sta *mvmsta;
	u32 available_tids = 0;
	u8 tid;

	if (WARN_ON(vif->type != NL80211_IFTYPE_STATION ||
		    mvmvif->ap_sta_id == IWL_MVM_STATION_COUNT))
		return false;

	ap_sta = rcu_dereference(mvm->fw_id_to_mac_id[mvmvif->ap_sta_id]);
	if (IS_ERR_OR_NULL(ap_sta))
		return false;

	mvmsta = iwl_mvm_sta_from_mac80211(ap_sta);
	spin_lock_bh(&mvmsta->lock);
	for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++) {
		struct iwl_mvm_tid_data *tid_data = &mvmsta->tid_data[tid];

		/*
		 * in case of pending tx packets, don't use this tid
		 * for offloading in order to prevent reuse of the same
		 * qos seq counters.
		 */
		if (iwl_mvm_tid_queued(tid_data))
			continue;

		if (tid_data->state != IWL_AGG_OFF)
			continue;

		available_tids |= BIT(tid);
	}
	spin_unlock_bh(&mvmsta->lock);

	/*
	 * disallow protocol offloading if we have no available tid
	 * (with no pending frames and no active aggregation,
	 * as we don't handle "holes" properly - the scheduler needs the
	 * frame's seq number and TFD index to match)
	 */
	if (!available_tids)
		return true;

	/* for simplicity, just use the first available tid */
	iter_data->offloading_tid = ffs(available_tids) - 1;
	return false;
}

static void iwl_mvm_enter_d0i3_iterator(void *_data, u8 *mac,
					struct ieee80211_vif *vif)
{
	struct iwl_d0i3_iter_data *data = _data;
	struct iwl_mvm *mvm = data->mvm;
	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
	u32 flags = CMD_ASYNC | CMD_HIGH_PRIO | CMD_SEND_IN_IDLE;

	IWL_DEBUG_RPM(mvm, "entering D0i3 - vif %pM\n", vif->addr);
	if (vif->type != NL80211_IFTYPE_STATION ||
	    !vif->bss_conf.assoc)
		return;

	/*
	 * in case of pending tx packets or active aggregations,
	 * avoid offloading features in order to prevent reuse of
	 * the same qos seq counters.
	 */
	if (iwl_mvm_disallow_offloading(mvm, vif, data))
		data->disable_offloading = true;

	iwl_mvm_update_d0i3_power_mode(mvm, vif, true, flags);
	iwl_mvm_send_proto_offload(mvm, vif, data->disable_offloading, flags);

	/*
	 * on init/association, mvm already configures POWER_TABLE_CMD
	 * and REPLY_MCAST_FILTER_CMD, so currently don't
	 * reconfigure them (we might want to use different
	 * params later on, though).
	 */
	data->ap_sta_id = mvmvif->ap_sta_id;
	data->vif_count++;
}

static void iwl_mvm_set_wowlan_data(struct iwl_mvm *mvm,
				    struct iwl_wowlan_config_cmd *cmd,
				    struct iwl_d0i3_iter_data *iter_data)
{
	struct ieee80211_sta *ap_sta;
	struct iwl_mvm_sta *mvm_ap_sta;

	if (iter_data->ap_sta_id == IWL_MVM_STATION_COUNT)
		return;

	rcu_read_lock();

	ap_sta = rcu_dereference(mvm->fw_id_to_mac_id[iter_data->ap_sta_id]);
	if (IS_ERR_OR_NULL(ap_sta))
		goto out;

	mvm_ap_sta = iwl_mvm_sta_from_mac80211(ap_sta);
	cmd->is_11n_connection = ap_sta->ht_cap.ht_supported;
	cmd->offloading_tid = iter_data->offloading_tid;

	/*
	 * The d0i3 uCode takes care of the nonqos counters,
	 * so configure only the qos seq ones.
	 */
	iwl_mvm_set_wowlan_qos_seq(mvm_ap_sta, cmd);
out:
	rcu_read_unlock();
}

int iwl_mvm_enter_d0i3(struct iwl_op_mode *op_mode)
{
	struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
	u32 flags = CMD_ASYNC | CMD_HIGH_PRIO | CMD_SEND_IN_IDLE;
	int ret;
	struct iwl_d0i3_iter_data d0i3_iter_data = {
		.mvm = mvm,
	};
	struct iwl_wowlan_config_cmd wowlan_config_cmd = {
		.wakeup_filter = cpu_to_le32(IWL_WOWLAN_WAKEUP_RX_FRAME |
					     IWL_WOWLAN_WAKEUP_BEACON_MISS |
					     IWL_WOWLAN_WAKEUP_LINK_CHANGE |
					     IWL_WOWLAN_WAKEUP_BCN_FILTERING),
	};
	struct iwl_d3_manager_config d3_cfg_cmd = {
		.min_sleep_time = cpu_to_le32(1000),
	};

	IWL_DEBUG_RPM(mvm, "MVM entering D0i3\n");

	/* make sure we have no running tx while configuring the qos */
	set_bit(IWL_MVM_STATUS_IN_D0I3, &mvm->status);
	synchronize_net();

	/*
	 * iwl_mvm_ref_sync takes a reference before checking the flag.
	 * so by checking there is no held reference we prevent a state
	 * in which iwl_mvm_ref_sync continues successfully while we
	 * configure the firmware to enter d0i3
	 */
	if (iwl_mvm_ref_taken(mvm)) {
		IWL_DEBUG_RPM(mvm->trans, "abort d0i3 due to taken ref\n");
		clear_bit(IWL_MVM_STATUS_IN_D0I3, &mvm->status);
		wake_up(&mvm->d0i3_exit_waitq);
		return 1;
	}

	ieee80211_iterate_active_interfaces_atomic(mvm->hw,
						   IEEE80211_IFACE_ITER_NORMAL,
						   iwl_mvm_enter_d0i3_iterator,
						   &d0i3_iter_data);
	if (d0i3_iter_data.vif_count == 1) {
		mvm->d0i3_ap_sta_id = d0i3_iter_data.ap_sta_id;
		mvm->d0i3_offloading = !d0i3_iter_data.disable_offloading;
	} else {
		WARN_ON_ONCE(d0i3_iter_data.vif_count > 1);
		mvm->d0i3_ap_sta_id = IWL_MVM_STATION_COUNT;
		mvm->d0i3_offloading = false;
	}

	iwl_mvm_set_wowlan_data(mvm, &wowlan_config_cmd, &d0i3_iter_data);
	ret = iwl_mvm_send_cmd_pdu(mvm, WOWLAN_CONFIGURATION, flags,
				   sizeof(wowlan_config_cmd),
				   &wowlan_config_cmd);
	if (ret)
		return ret;

	return iwl_mvm_send_cmd_pdu(mvm, D3_CONFIG_CMD,
				    flags | CMD_MAKE_TRANS_IDLE,
				    sizeof(d3_cfg_cmd), &d3_cfg_cmd);
}

static void iwl_mvm_exit_d0i3_iterator(void *_data, u8 *mac,
				       struct ieee80211_vif *vif)
{
	struct iwl_mvm *mvm = _data;
	u32 flags = CMD_ASYNC | CMD_HIGH_PRIO;

	IWL_DEBUG_RPM(mvm, "exiting D0i3 - vif %pM\n", vif->addr);
	if (vif->type != NL80211_IFTYPE_STATION ||
	    !vif->bss_conf.assoc)
		return;

	iwl_mvm_update_d0i3_power_mode(mvm, vif, false, flags);
}

static void iwl_mvm_d0i3_disconnect_iter(void *data, u8 *mac,
					 struct ieee80211_vif *vif)
{
	struct iwl_mvm *mvm = data;
	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);

	if (vif->type == NL80211_IFTYPE_STATION && vif->bss_conf.assoc &&
	    mvm->d0i3_ap_sta_id == mvmvif->ap_sta_id)
		ieee80211_connection_loss(vif);
}

void iwl_mvm_d0i3_enable_tx(struct iwl_mvm *mvm, __le16 *qos_seq)
{
	struct ieee80211_sta *sta = NULL;
	struct iwl_mvm_sta *mvm_ap_sta;
	int i;
	bool wake_queues = false;

	lockdep_assert_held(&mvm->mutex);

	spin_lock_bh(&mvm->d0i3_tx_lock);

	if (mvm->d0i3_ap_sta_id == IWL_MVM_STATION_COUNT)
		goto out;

	IWL_DEBUG_RPM(mvm, "re-enqueue packets\n");

	/* get the sta in order to update seq numbers and re-enqueue skbs */
	sta = rcu_dereference_protected(
			mvm->fw_id_to_mac_id[mvm->d0i3_ap_sta_id],
			lockdep_is_held(&mvm->mutex));

	if (IS_ERR_OR_NULL(sta)) {
		sta = NULL;
		goto out;
	}

	if (mvm->d0i3_offloading && qos_seq) {
		/* update qos seq numbers if offloading was enabled */
		mvm_ap_sta = iwl_mvm_sta_from_mac80211(sta);
		for (i = 0; i < IWL_MAX_TID_COUNT; i++) {
			u16 seq = le16_to_cpu(qos_seq[i]);
			/* firmware stores last-used one, we store next one */
			seq += 0x10;
			mvm_ap_sta->tid_data[i].seq_number = seq;
		}
	}
out:
	/* re-enqueue (or drop) all packets */
	while (!skb_queue_empty(&mvm->d0i3_tx)) {
		struct sk_buff *skb = __skb_dequeue(&mvm->d0i3_tx);

		if (!sta || iwl_mvm_tx_skb(mvm, skb, sta))
			ieee80211_free_txskb(mvm->hw, skb);

		/* if the skb_queue is not empty, we need to wake queues */
		wake_queues = true;
	}
	clear_bit(IWL_MVM_STATUS_IN_D0I3, &mvm->status);
	wake_up(&mvm->d0i3_exit_waitq);
	mvm->d0i3_ap_sta_id = IWL_MVM_STATION_COUNT;
	if (wake_queues)
		ieee80211_wake_queues(mvm->hw);

	spin_unlock_bh(&mvm->d0i3_tx_lock);
}

static void iwl_mvm_d0i3_exit_work(struct work_struct *wk)
{
	struct iwl_mvm *mvm = container_of(wk, struct iwl_mvm, d0i3_exit_work);
	struct iwl_host_cmd get_status_cmd = {
		.id = WOWLAN_GET_STATUSES,
		.flags = CMD_HIGH_PRIO | CMD_WANT_SKB,
	};
	struct iwl_wowlan_status *status;
	int ret;
	u32 disconnection_reasons, wakeup_reasons;
	__le16 *qos_seq = NULL;

	mutex_lock(&mvm->mutex);
	ret = iwl_mvm_send_cmd(mvm, &get_status_cmd);
	if (ret)
		goto out;

	if (!get_status_cmd.resp_pkt)
		goto out;

	status = (void *)get_status_cmd.resp_pkt->data;
	wakeup_reasons = le32_to_cpu(status->wakeup_reasons);
	qos_seq = status->qos_seq_ctr;

	IWL_DEBUG_RPM(mvm, "wakeup reasons: 0x%x\n", wakeup_reasons);

	disconnection_reasons =
		IWL_WOWLAN_WAKEUP_BY_DISCONNECTION_ON_MISSED_BEACON |
		IWL_WOWLAN_WAKEUP_BY_DISCONNECTION_ON_DEAUTH;
	if (wakeup_reasons & disconnection_reasons)
		ieee80211_iterate_active_interfaces(
			mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
			iwl_mvm_d0i3_disconnect_iter, mvm);

	iwl_free_resp(&get_status_cmd);
out:
	iwl_mvm_d0i3_enable_tx(mvm, qos_seq);
	iwl_mvm_unref(mvm, IWL_MVM_REF_EXIT_WORK);
	mutex_unlock(&mvm->mutex);
}

int _iwl_mvm_exit_d0i3(struct iwl_mvm *mvm)
{
	u32 flags = CMD_ASYNC | CMD_HIGH_PRIO | CMD_SEND_IN_IDLE |
		    CMD_WAKE_UP_TRANS;
	int ret;

	IWL_DEBUG_RPM(mvm, "MVM exiting D0i3\n");

	mutex_lock(&mvm->d0i3_suspend_mutex);
	if (test_bit(D0I3_DEFER_WAKEUP, &mvm->d0i3_suspend_flags)) {
		IWL_DEBUG_RPM(mvm, "Deferring d0i3 exit until resume\n");
		__set_bit(D0I3_PENDING_WAKEUP, &mvm->d0i3_suspend_flags);
		mutex_unlock(&mvm->d0i3_suspend_mutex);
		return 0;
	}
	mutex_unlock(&mvm->d0i3_suspend_mutex);

	ret = iwl_mvm_send_cmd_pdu(mvm, D0I3_END_CMD, flags, 0, NULL);
	if (ret)
		goto out;

	ieee80211_iterate_active_interfaces_atomic(mvm->hw,
						   IEEE80211_IFACE_ITER_NORMAL,
						   iwl_mvm_exit_d0i3_iterator,
						   mvm);
out:
	schedule_work(&mvm->d0i3_exit_work);
	return ret;
}

int iwl_mvm_exit_d0i3(struct iwl_op_mode *op_mode)
{
	struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);

	iwl_mvm_ref(mvm, IWL_MVM_REF_EXIT_WORK);
	return _iwl_mvm_exit_d0i3(mvm);
}

static void iwl_mvm_napi_add(struct iwl_op_mode *op_mode,
			     struct napi_struct *napi,
			     struct net_device *napi_dev,
			     int (*poll)(struct napi_struct *, int),
			     int weight)
{
	struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);

	ieee80211_napi_add(mvm->hw, napi, napi_dev, poll, weight);
}

static const struct iwl_op_mode_ops iwl_mvm_ops = {
	.start = iwl_op_mode_mvm_start,
	.stop = iwl_op_mode_mvm_stop,
	.rx = iwl_mvm_rx_dispatch,
	.queue_full = iwl_mvm_stop_sw_queue,
	.queue_not_full = iwl_mvm_wake_sw_queue,
	.hw_rf_kill = iwl_mvm_set_hw_rfkill_state,
	.free_skb = iwl_mvm_free_skb,
	.nic_error = iwl_mvm_nic_error,
	.cmd_queue_full = iwl_mvm_cmd_queue_full,
	.nic_config = iwl_mvm_nic_config,
	.enter_d0i3 = iwl_mvm_enter_d0i3,
	.exit_d0i3 = iwl_mvm_exit_d0i3,
	.napi_add = iwl_mvm_napi_add,
};