iwlwifi: mvm: implement mac80211 TDLS channel-switch APIs

[mirror_ubuntu-jammy-kernel.git] / 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"

/*
 * module name, copyright, version, etc.
 */
#define DRV_DESCRIPTION "The new Intel(R) wireless AGN driver for Linux"

#define DRV_VERSION     IWLWIFI_VERSION

MODULE_DESCRIPTION(DRV_DESCRIPTION);
MODULE_VERSION(DRV_VERSION);
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;

        radio_cfg_type = (mvm->fw->phy_config & FW_PHY_CFG_RADIO_TYPE) >>
                          FW_PHY_CFG_RADIO_TYPE_POS;
        radio_cfg_step = (mvm->fw->phy_config & FW_PHY_CFG_RADIO_STEP) >>
                          FW_PHY_CFG_RADIO_STEP_POS;
        radio_cfg_dash = (mvm->fw->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),

};
#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(NET_DETECT_CONFIG_CMD),
        CMD(NET_DETECT_PROFILES_QUERY_CMD),
        CMD(NET_DETECT_PROFILES_CMD),
        CMD(NET_DETECT_HOTSPOTS_CMD),
        CMD(NET_DETECT_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;

        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);

        /* 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
                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_v3 *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->common.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->common);
out:
        rcu_read_unlock();
}
static 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_v3 wowlan_config_cmd = {
                .common = {
                        .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 = (struct iwl_mvm_sta *)sta->drv_priv;
                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;
}

static 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,
};