/******************************************************************************
 *
 * 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 - 2015 Intel Corporation. All rights reserved.
 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
 * Copyright(c) 2016 Intel Deutschland 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 <linuxwifi@intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 * BSD LICENSE
 *
 * Copyright(c) 2012 - 2015 Intel Corporation. All rights reserved.
 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
 * Copyright(c) 2016 Intel Deutschland 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 <net/mac80211.h>

#include "mvm.h"
#include "sta.h"
#include "rs.h"

/*
 * New version of ADD_STA_sta command added new fields at the end of the
 * structure, so sending the size of the relevant API's structure is enough to
 * support both API versions.
 */
static inline int iwl_mvm_add_sta_cmd_size(struct iwl_mvm *mvm)
{
        return iwl_mvm_has_new_rx_api(mvm) ?
                sizeof(struct iwl_mvm_add_sta_cmd) :
                sizeof(struct iwl_mvm_add_sta_cmd_v7);
}

static int iwl_mvm_find_free_sta_id(struct iwl_mvm *mvm,
                                    enum nl80211_iftype iftype)
{
        int sta_id;
        u32 reserved_ids = 0;

        BUILD_BUG_ON(IWL_MVM_STATION_COUNT > 32);
        WARN_ON_ONCE(test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status));

        lockdep_assert_held(&mvm->mutex);

        /* d0i3/d3 assumes the AP's sta_id (of sta vif) is 0. reserve it. */
        if (iftype != NL80211_IFTYPE_STATION)
                reserved_ids = BIT(0);

        /* Don't take rcu_read_lock() since we are protected by mvm->mutex */
        for (sta_id = 0; sta_id < IWL_MVM_STATION_COUNT; sta_id++) {
                if (BIT(sta_id) & reserved_ids)
                        continue;

                if (!rcu_dereference_protected(mvm->fw_id_to_mac_id[sta_id],
                                               lockdep_is_held(&mvm->mutex)))
                        return sta_id;
        }
        return IWL_MVM_STATION_COUNT;
}

/* send station add/update command to firmware */
int iwl_mvm_sta_send_to_fw(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
                           bool update, unsigned int flags)
{
        struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
        struct iwl_mvm_add_sta_cmd add_sta_cmd = {
                .sta_id = mvm_sta->sta_id,
                .mac_id_n_color = cpu_to_le32(mvm_sta->mac_id_n_color),
                .add_modify = update ? 1 : 0,
                .station_flags_msk = cpu_to_le32(STA_FLG_FAT_EN_MSK |
                                                 STA_FLG_MIMO_EN_MSK),
                .tid_disable_tx = cpu_to_le16(mvm_sta->tid_disable_agg),
        };
        int ret;
        u32 status;
        u32 agg_size = 0, mpdu_dens = 0;

        if (!update || (flags & STA_MODIFY_QUEUES)) {
                add_sta_cmd.tfd_queue_msk = cpu_to_le32(mvm_sta->tfd_queue_msk);
                memcpy(&add_sta_cmd.addr, sta->addr, ETH_ALEN);

                if (flags & STA_MODIFY_QUEUES)
                        add_sta_cmd.modify_mask |= STA_MODIFY_QUEUES;
        }

        switch (sta->bandwidth) {
        case IEEE80211_STA_RX_BW_160:
                add_sta_cmd.station_flags |= cpu_to_le32(STA_FLG_FAT_EN_160MHZ);
                /* fall through */
        case IEEE80211_STA_RX_BW_80:
                add_sta_cmd.station_flags |= cpu_to_le32(STA_FLG_FAT_EN_80MHZ);
                /* fall through */
        case IEEE80211_STA_RX_BW_40:
                add_sta_cmd.station_flags |= cpu_to_le32(STA_FLG_FAT_EN_40MHZ);
                /* fall through */
        case IEEE80211_STA_RX_BW_20:
                if (sta->ht_cap.ht_supported)
                        add_sta_cmd.station_flags |=
                                cpu_to_le32(STA_FLG_FAT_EN_20MHZ);
                break;
        }

        switch (sta->rx_nss) {
        case 1:
                add_sta_cmd.station_flags |= cpu_to_le32(STA_FLG_MIMO_EN_SISO);
                break;
        case 2:
                add_sta_cmd.station_flags |= cpu_to_le32(STA_FLG_MIMO_EN_MIMO2);
                break;
        case 3 ... 8:
                add_sta_cmd.station_flags |= cpu_to_le32(STA_FLG_MIMO_EN_MIMO3);
                break;
        }

        switch (sta->smps_mode) {
        case IEEE80211_SMPS_AUTOMATIC:
        case IEEE80211_SMPS_NUM_MODES:
                WARN_ON(1);
                break;
        case IEEE80211_SMPS_STATIC:
                /* override NSS */
                add_sta_cmd.station_flags &= ~cpu_to_le32(STA_FLG_MIMO_EN_MSK);
                add_sta_cmd.station_flags |= cpu_to_le32(STA_FLG_MIMO_EN_SISO);
                break;
        case IEEE80211_SMPS_DYNAMIC:
                add_sta_cmd.station_flags |= cpu_to_le32(STA_FLG_RTS_MIMO_PROT);
                break;
        case IEEE80211_SMPS_OFF:
                /* nothing */
                break;
        }

        if (sta->ht_cap.ht_supported) {
                add_sta_cmd.station_flags_msk |=
                        cpu_to_le32(STA_FLG_MAX_AGG_SIZE_MSK |
                                    STA_FLG_AGG_MPDU_DENS_MSK);

                mpdu_dens = sta->ht_cap.ampdu_density;
        }

        if (sta->vht_cap.vht_supported) {
                agg_size = sta->vht_cap.cap &
                        IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;
                agg_size >>=
                        IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT;
        } else if (sta->ht_cap.ht_supported) {
                agg_size = sta->ht_cap.ampdu_factor;
        }

        add_sta_cmd.station_flags |=
                cpu_to_le32(agg_size << STA_FLG_MAX_AGG_SIZE_SHIFT);
        add_sta_cmd.station_flags |=
                cpu_to_le32(mpdu_dens << STA_FLG_AGG_MPDU_DENS_SHIFT);

        status = ADD_STA_SUCCESS;
        ret = iwl_mvm_send_cmd_pdu_status(mvm, ADD_STA,
                                          iwl_mvm_add_sta_cmd_size(mvm),
                                          &add_sta_cmd, &status);
        if (ret)
                return ret;

        switch (status & IWL_ADD_STA_STATUS_MASK) {
        case ADD_STA_SUCCESS:
                IWL_DEBUG_ASSOC(mvm, "ADD_STA PASSED\n");
                break;
        default:
                ret = -EIO;
                IWL_ERR(mvm, "ADD_STA failed\n");
                break;
        }

        return ret;
}

static void iwl_mvm_rx_agg_session_expired(unsigned long data)
{
        struct iwl_mvm_baid_data __rcu **rcu_ptr = (void *)data;
        struct iwl_mvm_baid_data *ba_data;
        struct ieee80211_sta *sta;
        struct iwl_mvm_sta *mvm_sta;
        unsigned long timeout;

        rcu_read_lock();

        ba_data = rcu_dereference(*rcu_ptr);

        if (WARN_ON(!ba_data))
                goto unlock;

        if (!ba_data->timeout)
                goto unlock;

        timeout = ba_data->last_rx + TU_TO_JIFFIES(ba_data->timeout * 2);
        if (time_is_after_jiffies(timeout)) {
                mod_timer(&ba_data->session_timer, timeout);
                goto unlock;
        }

        /* Timer expired */
        sta = rcu_dereference(ba_data->mvm->fw_id_to_mac_id[ba_data->sta_id]);
        mvm_sta = iwl_mvm_sta_from_mac80211(sta);
        ieee80211_stop_rx_ba_session_offl(mvm_sta->vif,
                                          sta->addr, ba_data->tid);
unlock:
        rcu_read_unlock();
}

static int iwl_mvm_tdls_sta_init(struct iwl_mvm *mvm,
                                 struct ieee80211_sta *sta)
{
        unsigned long used_hw_queues;
        struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
        unsigned int wdg_timeout =
                iwl_mvm_get_wd_timeout(mvm, NULL, true, false);
        u32 ac;

        lockdep_assert_held(&mvm->mutex);

        used_hw_queues = iwl_mvm_get_used_hw_queues(mvm, NULL);

        /* Find available queues, and allocate them to the ACs */
        for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
                u8 queue = find_first_zero_bit(&used_hw_queues,
                                               mvm->first_agg_queue);

                if (queue >= mvm->first_agg_queue) {
                        IWL_ERR(mvm, "Failed to allocate STA queue\n");
                        return -EBUSY;
                }

                __set_bit(queue, &used_hw_queues);
                mvmsta->hw_queue[ac] = queue;
        }

        /* Found a place for all queues - enable them */
        for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
                iwl_mvm_enable_ac_txq(mvm, mvmsta->hw_queue[ac],
                                      mvmsta->hw_queue[ac],
                                      iwl_mvm_ac_to_tx_fifo[ac], 0,
                                      wdg_timeout);
                mvmsta->tfd_queue_msk |= BIT(mvmsta->hw_queue[ac]);
        }

        return 0;
}

static void iwl_mvm_tdls_sta_deinit(struct iwl_mvm *mvm,
                                    struct ieee80211_sta *sta)
{
        struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
        unsigned long sta_msk;
        int i;

        lockdep_assert_held(&mvm->mutex);

        /* disable the TDLS STA-specific queues */
        sta_msk = mvmsta->tfd_queue_msk;
        for_each_set_bit(i, &sta_msk, sizeof(sta_msk) * BITS_PER_BYTE)
                iwl_mvm_disable_txq(mvm, i, i, IWL_MAX_TID_COUNT, 0);
}

/* Disable aggregations for a bitmap of TIDs for a given station */
static int iwl_mvm_invalidate_sta_queue(struct iwl_mvm *mvm, int queue,
                                        unsigned long disable_agg_tids,
                                        bool remove_queue)
{
        struct iwl_mvm_add_sta_cmd cmd = {};
        struct ieee80211_sta *sta;
        struct iwl_mvm_sta *mvmsta;
        u32 status;
        u8 sta_id;
        int ret;

        spin_lock_bh(&mvm->queue_info_lock);
        sta_id = mvm->queue_info[queue].ra_sta_id;
        spin_unlock_bh(&mvm->queue_info_lock);

        rcu_read_lock();

        sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);

        if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) {
                rcu_read_unlock();
                return -EINVAL;
        }

        mvmsta = iwl_mvm_sta_from_mac80211(sta);

        mvmsta->tid_disable_agg |= disable_agg_tids;

        cmd.mac_id_n_color = cpu_to_le32(mvmsta->mac_id_n_color);
        cmd.sta_id = mvmsta->sta_id;
        cmd.add_modify = STA_MODE_MODIFY;
        cmd.modify_mask = STA_MODIFY_QUEUES;
        if (disable_agg_tids)
                cmd.modify_mask |= STA_MODIFY_TID_DISABLE_TX;
        if (remove_queue)
                cmd.modify_mask |= STA_MODIFY_QUEUE_REMOVAL;
        cmd.tfd_queue_msk = cpu_to_le32(mvmsta->tfd_queue_msk);
        cmd.tid_disable_tx = cpu_to_le16(mvmsta->tid_disable_agg);

        rcu_read_unlock();

        /* Notify FW of queue removal from the STA queues */
        status = ADD_STA_SUCCESS;
        ret = iwl_mvm_send_cmd_pdu_status(mvm, ADD_STA,
                                          iwl_mvm_add_sta_cmd_size(mvm),
                                          &cmd, &status);

        return ret;
}

static int iwl_mvm_get_queue_agg_tids(struct iwl_mvm *mvm, int queue)
{
        struct ieee80211_sta *sta;
        struct iwl_mvm_sta *mvmsta;
        unsigned long tid_bitmap;
        unsigned long agg_tids = 0;
        s8 sta_id;
        int tid;

        lockdep_assert_held(&mvm->mutex);

        spin_lock_bh(&mvm->queue_info_lock);
        sta_id = mvm->queue_info[queue].ra_sta_id;
        tid_bitmap = mvm->queue_info[queue].tid_bitmap;
        spin_unlock_bh(&mvm->queue_info_lock);

        sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[sta_id],
                                        lockdep_is_held(&mvm->mutex));

        if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta)))
                return -EINVAL;

        mvmsta = iwl_mvm_sta_from_mac80211(sta);

        spin_lock_bh(&mvmsta->lock);
        for_each_set_bit(tid, &tid_bitmap, IWL_MAX_TID_COUNT + 1) {
                if (mvmsta->tid_data[tid].state == IWL_AGG_ON)
                        agg_tids |= BIT(tid);
        }
        spin_unlock_bh(&mvmsta->lock);

        return agg_tids;
}

/*
 * Remove a queue from a station's resources.
 * Note that this only marks as free. It DOESN'T delete a BA agreement, and
 * doesn't disable the queue
 */
static int iwl_mvm_remove_sta_queue_marking(struct iwl_mvm *mvm, int queue)
{
        struct ieee80211_sta *sta;
        struct iwl_mvm_sta *mvmsta;
        unsigned long tid_bitmap;
        unsigned long disable_agg_tids = 0;
        u8 sta_id;
        int tid;

        lockdep_assert_held(&mvm->mutex);

        spin_lock_bh(&mvm->queue_info_lock);
        sta_id = mvm->queue_info[queue].ra_sta_id;
        tid_bitmap = mvm->queue_info[queue].tid_bitmap;
        spin_unlock_bh(&mvm->queue_info_lock);

        rcu_read_lock();

        sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);

        if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) {
                rcu_read_unlock();
                return 0;
        }

        mvmsta = iwl_mvm_sta_from_mac80211(sta);

        spin_lock_bh(&mvmsta->lock);
        /* Unmap MAC queues and TIDs from this queue */
        for_each_set_bit(tid, &tid_bitmap, IWL_MAX_TID_COUNT + 1) {
                if (mvmsta->tid_data[tid].state == IWL_AGG_ON)
                        disable_agg_tids |= BIT(tid);
                mvmsta->tid_data[tid].txq_id = IEEE80211_INVAL_HW_QUEUE;
        }

        mvmsta->tfd_queue_msk &= ~BIT(queue); /* Don't use this queue anymore */
        spin_unlock_bh(&mvmsta->lock);

        rcu_read_unlock();

        spin_lock_bh(&mvm->queue_info_lock);
        /* Unmap MAC queues and TIDs from this queue */
        mvm->queue_info[queue].hw_queue_to_mac80211 = 0;
        mvm->queue_info[queue].hw_queue_refcount = 0;
        mvm->queue_info[queue].tid_bitmap = 0;
        spin_unlock_bh(&mvm->queue_info_lock);

        return disable_agg_tids;
}

static int iwl_mvm_get_shared_queue(struct iwl_mvm *mvm,
                                    unsigned long tfd_queue_mask, u8 ac)
{
        int queue = 0;
        u8 ac_to_queue[IEEE80211_NUM_ACS];
        int i;

        lockdep_assert_held(&mvm->queue_info_lock);

        memset(&ac_to_queue, IEEE80211_INVAL_HW_QUEUE, sizeof(ac_to_queue));

        /* See what ACs the existing queues for this STA have */
        for_each_set_bit(i, &tfd_queue_mask, IWL_MVM_DQA_MAX_DATA_QUEUE) {
                /* Only DATA queues can be shared */
                if (i < IWL_MVM_DQA_MIN_DATA_QUEUE &&
                    i != IWL_MVM_DQA_BSS_CLIENT_QUEUE)
                        continue;

                /* Don't try and take queues being reconfigured */
                if (mvm->queue_info[queue].status ==
                    IWL_MVM_QUEUE_RECONFIGURING)
                        continue;

                ac_to_queue[mvm->queue_info[i].mac80211_ac] = i;
        }

        /*
         * The queue to share is chosen only from DATA queues as follows (in
         * descending priority):
         * 1. An AC_BE queue
         * 2. Same AC queue
         * 3. Highest AC queue that is lower than new AC
         * 4. Any existing AC (there always is at least 1 DATA queue)
         */

        /* Priority 1: An AC_BE queue */
        if (ac_to_queue[IEEE80211_AC_BE] != IEEE80211_INVAL_HW_QUEUE)
                queue = ac_to_queue[IEEE80211_AC_BE];
        /* Priority 2: Same AC queue */
        else if (ac_to_queue[ac] != IEEE80211_INVAL_HW_QUEUE)
                queue = ac_to_queue[ac];
        /* Priority 3a: If new AC is VO and VI exists - use VI */
        else if (ac == IEEE80211_AC_VO &&
                 ac_to_queue[IEEE80211_AC_VI] != IEEE80211_INVAL_HW_QUEUE)
                queue = ac_to_queue[IEEE80211_AC_VI];
        /* Priority 3b: No BE so only AC less than the new one is BK */
        else if (ac_to_queue[IEEE80211_AC_BK] != IEEE80211_INVAL_HW_QUEUE)
                queue = ac_to_queue[IEEE80211_AC_BK];
        /* Priority 4a: No BE nor BK - use VI if exists */
        else if (ac_to_queue[IEEE80211_AC_VI] != IEEE80211_INVAL_HW_QUEUE)
                queue = ac_to_queue[IEEE80211_AC_VI];
        /* Priority 4b: No BE, BK nor VI - use VO if exists */
        else if (ac_to_queue[IEEE80211_AC_VO] != IEEE80211_INVAL_HW_QUEUE)
                queue = ac_to_queue[IEEE80211_AC_VO];

        /* Make sure queue found (or not) is legal */
        if (!iwl_mvm_is_dqa_data_queue(mvm, queue) &&
            !iwl_mvm_is_dqa_mgmt_queue(mvm, queue) &&
            (queue != IWL_MVM_DQA_BSS_CLIENT_QUEUE)) {
                IWL_ERR(mvm, "No DATA queues available to share\n");
                return -ENOSPC;
        }

        /* Make sure the queue isn't in the middle of being reconfigured */
        if (mvm->queue_info[queue].status == IWL_MVM_QUEUE_RECONFIGURING) {
                IWL_ERR(mvm,
                        "TXQ %d is in the middle of re-config - try again\n",
                        queue);
                return -EBUSY;
        }

        return queue;
}

/*
 * If a given queue has a higher AC than the TID stream that is being compared
 * to, the queue needs to be redirected to the lower AC. This function does that
 * in such a case, otherwise - if no redirection required - it does nothing,
 * unless the %force param is true.
 */
int iwl_mvm_scd_queue_redirect(struct iwl_mvm *mvm, int queue, int tid,
                               int ac, int ssn, unsigned int wdg_timeout,
                               bool force)
{
        struct iwl_scd_txq_cfg_cmd cmd = {
                .scd_queue = queue,
                .action = SCD_CFG_DISABLE_QUEUE,
        };
        bool shared_queue;
        unsigned long mq;
        int ret;

        /*
         * If the AC is lower than current one - FIFO needs to be redirected to
         * the lowest one of the streams in the queue. Check if this is needed
         * here.
         * Notice that the enum ieee80211_ac_numbers is "flipped", so BK is with
         * value 3 and VO with value 0, so to check if ac X is lower than ac Y
         * we need to check if the numerical value of X is LARGER than of Y.
         */
        spin_lock_bh(&mvm->queue_info_lock);
        if (ac <= mvm->queue_info[queue].mac80211_ac && !force) {
                spin_unlock_bh(&mvm->queue_info_lock);

                IWL_DEBUG_TX_QUEUES(mvm,
                                    "No redirection needed on TXQ #%d\n",
                                    queue);
                return 0;
        }

        cmd.sta_id = mvm->queue_info[queue].ra_sta_id;
        cmd.tx_fifo = iwl_mvm_ac_to_tx_fifo[mvm->queue_info[queue].mac80211_ac];
        cmd.tid = mvm->queue_info[queue].txq_tid;
        mq = mvm->queue_info[queue].hw_queue_to_mac80211;
        shared_queue = (mvm->queue_info[queue].hw_queue_refcount > 1);
        spin_unlock_bh(&mvm->queue_info_lock);

        IWL_DEBUG_TX_QUEUES(mvm, "Redirecting TXQ #%d to FIFO #%d\n",
                            queue, iwl_mvm_ac_to_tx_fifo[ac]);

        /* Stop MAC queues and wait for this queue to empty */
        iwl_mvm_stop_mac_queues(mvm, mq);
        ret = iwl_trans_wait_tx_queue_empty(mvm->trans, BIT(queue));
        if (ret) {
                IWL_ERR(mvm, "Error draining queue %d before reconfig\n",
                        queue);
                ret = -EIO;
                goto out;
        }

        /* Before redirecting the queue we need to de-activate it */
        iwl_trans_txq_disable(mvm->trans, queue, false);
        ret = iwl_mvm_send_cmd_pdu(mvm, SCD_QUEUE_CFG, 0, sizeof(cmd), &cmd);
        if (ret)
                IWL_ERR(mvm, "Failed SCD disable TXQ %d (ret=%d)\n", queue,
                        ret);

        /* Make sure the SCD wrptr is correctly set before reconfiguring */
        iwl_trans_txq_enable_cfg(mvm->trans, queue, ssn, NULL, wdg_timeout);

        /* Update the TID "owner" of the queue */
        spin_lock_bh(&mvm->queue_info_lock);
        mvm->queue_info[queue].txq_tid = tid;
        spin_unlock_bh(&mvm->queue_info_lock);

        /* TODO: Work-around SCD bug when moving back by multiples of 0x40 */

        /* Redirect to lower AC */
        iwl_mvm_reconfig_scd(mvm, queue, iwl_mvm_ac_to_tx_fifo[ac],
                             cmd.sta_id, tid, LINK_QUAL_AGG_FRAME_LIMIT_DEF,
                             ssn);

        /* Update AC marking of the queue */
        spin_lock_bh(&mvm->queue_info_lock);
        mvm->queue_info[queue].mac80211_ac = ac;
        spin_unlock_bh(&mvm->queue_info_lock);

        /*
         * Mark queue as shared in transport if shared
         * Note this has to be done after queue enablement because enablement
         * can also set this value, and there is no indication there to shared
         * queues
         */
        if (shared_queue)
                iwl_trans_txq_set_shared_mode(mvm->trans, queue, true);

out:
        /* Continue using the MAC queues */
        iwl_mvm_start_mac_queues(mvm, mq);

        return ret;
}

static int iwl_mvm_sta_alloc_queue(struct iwl_mvm *mvm,
                                   struct ieee80211_sta *sta, u8 ac, int tid,
                                   struct ieee80211_hdr *hdr)
{
        struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
        struct iwl_trans_txq_scd_cfg cfg = {
                .fifo = iwl_mvm_ac_to_tx_fifo[ac],
                .sta_id = mvmsta->sta_id,
                .tid = tid,
                .frame_limit = IWL_FRAME_LIMIT,
        };
        unsigned int wdg_timeout =
                iwl_mvm_get_wd_timeout(mvm, mvmsta->vif, false, false);
        u8 mac_queue = mvmsta->vif->hw_queue[ac];
        int queue = -1;
        bool using_inactive_queue = false;
        unsigned long disable_agg_tids = 0;
        enum iwl_mvm_agg_state queue_state;
        bool shared_queue = false;
        int ssn;
        unsigned long tfd_queue_mask;
        int ret;

        lockdep_assert_held(&mvm->mutex);

        spin_lock_bh(&mvmsta->lock);
        tfd_queue_mask = mvmsta->tfd_queue_msk;
        spin_unlock_bh(&mvmsta->lock);

        spin_lock_bh(&mvm->queue_info_lock);

        /*
         * Non-QoS, QoS NDP and MGMT frames should go to a MGMT queue, if one
         * exists
         */
        if (!ieee80211_is_data_qos(hdr->frame_control) ||
            ieee80211_is_qos_nullfunc(hdr->frame_control)) {
                queue = iwl_mvm_find_free_queue(mvm, mvmsta->sta_id,
                                                IWL_MVM_DQA_MIN_MGMT_QUEUE,
                                                IWL_MVM_DQA_MAX_MGMT_QUEUE);
                if (queue >= IWL_MVM_DQA_MIN_MGMT_QUEUE)
                        IWL_DEBUG_TX_QUEUES(mvm, "Found free MGMT queue #%d\n",
                                            queue);

                /* If no such queue is found, we'll use a DATA queue instead */
        }

        if ((queue < 0 && mvmsta->reserved_queue != IEEE80211_INVAL_HW_QUEUE) &&
            (mvm->queue_info[mvmsta->reserved_queue].status ==
             IWL_MVM_QUEUE_RESERVED ||
             mvm->queue_info[mvmsta->reserved_queue].status ==
             IWL_MVM_QUEUE_INACTIVE)) {
                queue = mvmsta->reserved_queue;
                mvm->queue_info[queue].reserved = true;
                IWL_DEBUG_TX_QUEUES(mvm, "Using reserved queue #%d\n", queue);
        }

        if (queue < 0)
                queue = iwl_mvm_find_free_queue(mvm, mvmsta->sta_id,
                                                IWL_MVM_DQA_MIN_DATA_QUEUE,
                                                IWL_MVM_DQA_MAX_DATA_QUEUE);

        /*
         * Check if this queue is already allocated but inactive.
         * In such a case, we'll need to first free this queue before enabling
         * it again, so we'll mark it as reserved to make sure no new traffic
         * arrives on it
         */
        if (queue > 0 &&
            mvm->queue_info[queue].status == IWL_MVM_QUEUE_INACTIVE) {
                mvm->queue_info[queue].status = IWL_MVM_QUEUE_RESERVED;
                using_inactive_queue = true;
                IWL_DEBUG_TX_QUEUES(mvm,
                                    "Re-assigning TXQ %d: sta_id=%d, tid=%d\n",
                                    queue, mvmsta->sta_id, tid);
        }

        /* No free queue - we'll have to share */
        if (queue <= 0) {
                queue = iwl_mvm_get_shared_queue(mvm, tfd_queue_mask, ac);
                if (queue > 0) {
                        shared_queue = true;
                        mvm->queue_info[queue].status = IWL_MVM_QUEUE_SHARED;
                }
        }

        /*
         * Mark TXQ as ready, even though it hasn't been fully configured yet,
         * to make sure no one else takes it.
         * This will allow avoiding re-acquiring the lock at the end of the
         * configuration. On error we'll mark it back as free.
         */
        if ((queue > 0) && !shared_queue)
                mvm->queue_info[queue].status = IWL_MVM_QUEUE_READY;

        spin_unlock_bh(&mvm->queue_info_lock);

        /* This shouldn't happen - out of queues */
        if (WARN_ON(queue <= 0)) {
                IWL_ERR(mvm, "No available queues for tid %d on sta_id %d\n",
                        tid, cfg.sta_id);
                return queue;
        }

        /*
         * Actual en/disablement of aggregations is through the ADD_STA HCMD,
         * but for configuring the SCD to send A-MPDUs we need to mark the queue
         * as aggregatable.
         * Mark all DATA queues as allowing to be aggregated at some point
         */
        cfg.aggregate = (queue >= IWL_MVM_DQA_MIN_DATA_QUEUE ||
                         queue == IWL_MVM_DQA_BSS_CLIENT_QUEUE);

        /*
         * If this queue was previously inactive (idle) - we need to free it
         * first
         */
        if (using_inactive_queue) {
                struct iwl_scd_txq_cfg_cmd cmd = {
                        .scd_queue = queue,
                        .action = SCD_CFG_DISABLE_QUEUE,
                };
                u8 txq_curr_ac;

                disable_agg_tids = iwl_mvm_remove_sta_queue_marking(mvm, queue);

                spin_lock_bh(&mvm->queue_info_lock);
                txq_curr_ac = mvm->queue_info[queue].mac80211_ac;
                cmd.sta_id = mvm->queue_info[queue].ra_sta_id;
                cmd.tx_fifo = iwl_mvm_ac_to_tx_fifo[txq_curr_ac];
                cmd.tid = mvm->queue_info[queue].txq_tid;
                spin_unlock_bh(&mvm->queue_info_lock);

                /* Disable the queue */
                if (disable_agg_tids)
                        iwl_mvm_invalidate_sta_queue(mvm, queue,
                                                     disable_agg_tids, false);
                iwl_trans_txq_disable(mvm->trans, queue, false);
                ret = iwl_mvm_send_cmd_pdu(mvm, SCD_QUEUE_CFG, 0, sizeof(cmd),
                                           &cmd);
                if (ret) {
                        IWL_ERR(mvm,
                                "Failed to free inactive queue %d (ret=%d)\n",
                                queue, ret);

                        /* Re-mark the inactive queue as inactive */
                        spin_lock_bh(&mvm->queue_info_lock);
                        mvm->queue_info[queue].status = IWL_MVM_QUEUE_INACTIVE;
                        spin_unlock_bh(&mvm->queue_info_lock);

                        return ret;
                }

                /* If TXQ is allocated to another STA, update removal in FW */
                if (cmd.sta_id != mvmsta->sta_id)
                        iwl_mvm_invalidate_sta_queue(mvm, queue, 0, true);
        }

        IWL_DEBUG_TX_QUEUES(mvm,
                            "Allocating %squeue #%d to sta %d on tid %d\n",
                            shared_queue ? "shared " : "", queue,
                            mvmsta->sta_id, tid);

        if (shared_queue) {
                /* Disable any open aggs on this queue */
                disable_agg_tids = iwl_mvm_get_queue_agg_tids(mvm, queue);

                if (disable_agg_tids) {
                        IWL_DEBUG_TX_QUEUES(mvm, "Disabling aggs on queue %d\n",
                                            queue);
                        iwl_mvm_invalidate_sta_queue(mvm, queue,
                                                     disable_agg_tids, false);
                }
        }

        ssn = IEEE80211_SEQ_TO_SN(le16_to_cpu(hdr->seq_ctrl));
        iwl_mvm_enable_txq(mvm, queue, mac_queue, ssn, &cfg,
                           wdg_timeout);

        /*
         * Mark queue as shared in transport if shared
         * Note this has to be done after queue enablement because enablement
         * can also set this value, and there is no indication there to shared
         * queues
         */
        if (shared_queue)
                iwl_trans_txq_set_shared_mode(mvm->trans, queue, true);

        spin_lock_bh(&mvmsta->lock);
        mvmsta->tid_data[tid].txq_id = queue;
        mvmsta->tid_data[tid].is_tid_active = true;
        mvmsta->tfd_queue_msk |= BIT(queue);
        queue_state = mvmsta->tid_data[tid].state;

        if (mvmsta->reserved_queue == queue)
                mvmsta->reserved_queue = IEEE80211_INVAL_HW_QUEUE;
        spin_unlock_bh(&mvmsta->lock);

        if (!shared_queue) {
                ret = iwl_mvm_sta_send_to_fw(mvm, sta, true, STA_MODIFY_QUEUES);
                if (ret)
                        goto out_err;

                /* If we need to re-enable aggregations... */
                if (queue_state == IWL_AGG_ON) {
                        ret = iwl_mvm_sta_tx_agg(mvm, sta, tid, queue, true);
                        if (ret)
                                goto out_err;
                }
        } else {
                /* Redirect queue, if needed */
                ret = iwl_mvm_scd_queue_redirect(mvm, queue, tid, ac, ssn,
                                                 wdg_timeout, false);
                if (ret)
                        goto out_err;
        }

        return 0;

out_err:
        iwl_mvm_disable_txq(mvm, queue, mac_queue, tid, 0);

        return ret;
}

static void iwl_mvm_change_queue_owner(struct iwl_mvm *mvm, int queue)
{
        struct iwl_scd_txq_cfg_cmd cmd = {
                .scd_queue = queue,
                .action = SCD_CFG_UPDATE_QUEUE_TID,
        };
        s8 sta_id;
        int tid;
        unsigned long tid_bitmap;
        int ret;

        lockdep_assert_held(&mvm->mutex);

        spin_lock_bh(&mvm->queue_info_lock);
        sta_id = mvm->queue_info[queue].ra_sta_id;
        tid_bitmap = mvm->queue_info[queue].tid_bitmap;
        spin_unlock_bh(&mvm->queue_info_lock);

        if (WARN(!tid_bitmap, "TXQ %d has no tids assigned to it\n", queue))
                return;

        /* Find any TID for queue */
        tid = find_first_bit(&tid_bitmap, IWL_MAX_TID_COUNT + 1);
        cmd.tid = tid;
        cmd.tx_fifo = iwl_mvm_ac_to_tx_fifo[tid_to_mac80211_ac[tid]];

        ret = iwl_mvm_send_cmd_pdu(mvm, SCD_QUEUE_CFG, 0, sizeof(cmd), &cmd);
        if (ret)
                IWL_ERR(mvm, "Failed to update owner of TXQ %d (ret=%d)\n",
                        queue, ret);
        else
                IWL_DEBUG_TX_QUEUES(mvm, "Changed TXQ %d ownership to tid %d\n",
                                    queue, tid);
}

static void iwl_mvm_unshare_queue(struct iwl_mvm *mvm, int queue)
{
        struct ieee80211_sta *sta;
        struct iwl_mvm_sta *mvmsta;
        s8 sta_id;
        int tid = -1;
        unsigned long tid_bitmap;
        unsigned int wdg_timeout;
        int ssn;
        int ret = true;

        lockdep_assert_held(&mvm->mutex);

        spin_lock_bh(&mvm->queue_info_lock);
        sta_id = mvm->queue_info[queue].ra_sta_id;
        tid_bitmap = mvm->queue_info[queue].tid_bitmap;
        spin_unlock_bh(&mvm->queue_info_lock);

        /* Find TID for queue, and make sure it is the only one on the queue */
        tid = find_first_bit(&tid_bitmap, IWL_MAX_TID_COUNT + 1);
        if (tid_bitmap != BIT(tid)) {
                IWL_ERR(mvm, "Failed to unshare q %d, active tids=0x%lx\n",
                        queue, tid_bitmap);
                return;
        }

        IWL_DEBUG_TX_QUEUES(mvm, "Unsharing TXQ %d, keeping tid %d\n", queue,
                            tid);

        sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[sta_id],
                                        lockdep_is_held(&mvm->mutex));

        if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta)))
                return;

        mvmsta = iwl_mvm_sta_from_mac80211(sta);
        wdg_timeout = iwl_mvm_get_wd_timeout(mvm, mvmsta->vif, false, false);

        ssn = IEEE80211_SEQ_TO_SN(mvmsta->tid_data[tid].seq_number);

        ret = iwl_mvm_scd_queue_redirect(mvm, queue, tid,
                                         tid_to_mac80211_ac[tid], ssn,
                                         wdg_timeout, true);
        if (ret) {
                IWL_ERR(mvm, "Failed to redirect TXQ %d\n", queue);
                return;
        }

        /* If aggs should be turned back on - do it */
        if (mvmsta->tid_data[tid].state == IWL_AGG_ON) {
                struct iwl_mvm_add_sta_cmd cmd = {0};

                mvmsta->tid_disable_agg &= ~BIT(tid);

                cmd.mac_id_n_color = cpu_to_le32(mvmsta->mac_id_n_color);
                cmd.sta_id = mvmsta->sta_id;
                cmd.add_modify = STA_MODE_MODIFY;
                cmd.modify_mask = STA_MODIFY_TID_DISABLE_TX;
                cmd.tfd_queue_msk = cpu_to_le32(mvmsta->tfd_queue_msk);
                cmd.tid_disable_tx = cpu_to_le16(mvmsta->tid_disable_agg);

                ret = iwl_mvm_send_cmd_pdu(mvm, ADD_STA, CMD_ASYNC,
                                           iwl_mvm_add_sta_cmd_size(mvm), &cmd);
                if (!ret) {
                        IWL_DEBUG_TX_QUEUES(mvm,
                                            "TXQ #%d is now aggregated again\n",
                                            queue);

                        /* Mark queue intenally as aggregating again */
                        iwl_trans_txq_set_shared_mode(mvm->trans, queue, false);
                }
        }

        spin_lock_bh(&mvm->queue_info_lock);
        mvm->queue_info[queue].status = IWL_MVM_QUEUE_READY;
        spin_unlock_bh(&mvm->queue_info_lock);
}

static inline u8 iwl_mvm_tid_to_ac_queue(int tid)
{
        if (tid == IWL_MAX_TID_COUNT)
                return IEEE80211_AC_VO; /* MGMT */

        return tid_to_mac80211_ac[tid];
}

static void iwl_mvm_tx_deferred_stream(struct iwl_mvm *mvm,
                                       struct ieee80211_sta *sta, int tid)
{
        struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
        struct iwl_mvm_tid_data *tid_data = &mvmsta->tid_data[tid];
        struct sk_buff *skb;
        struct ieee80211_hdr *hdr;
        struct sk_buff_head deferred_tx;
        u8 mac_queue;
        bool no_queue = false; /* Marks if there is a problem with the queue */
        u8 ac;

        lockdep_assert_held(&mvm->mutex);

        skb = skb_peek(&tid_data->deferred_tx_frames);
        if (!skb)
                return;
        hdr = (void *)skb->data;

        ac = iwl_mvm_tid_to_ac_queue(tid);
        mac_queue = IEEE80211_SKB_CB(skb)->hw_queue;

        if (tid_data->txq_id == IEEE80211_INVAL_HW_QUEUE &&
            iwl_mvm_sta_alloc_queue(mvm, sta, ac, tid, hdr)) {
                IWL_ERR(mvm,
                        "Can't alloc TXQ for sta %d tid %d - dropping frame\n",
                        mvmsta->sta_id, tid);

                /*

                 * Mark queue as problematic so later the deferred traffic is
                 * freed, as we can do nothing with it
                 */
                no_queue = true;
        }

        __skb_queue_head_init(&deferred_tx);

        /* Disable bottom-halves when entering TX path */
        local_bh_disable();
        spin_lock(&mvmsta->lock);
        skb_queue_splice_init(&tid_data->deferred_tx_frames, &deferred_tx);
        spin_unlock(&mvmsta->lock);

        while ((skb = __skb_dequeue(&deferred_tx)))
                if (no_queue || iwl_mvm_tx_skb(mvm, skb, sta))
                        ieee80211_free_txskb(mvm->hw, skb);
        local_bh_enable();

        /* Wake queue */
        iwl_mvm_start_mac_queues(mvm, BIT(mac_queue));
}

void iwl_mvm_add_new_dqa_stream_wk(struct work_struct *wk)
{
        struct iwl_mvm *mvm = container_of(wk, struct iwl_mvm,
                                           add_stream_wk);
        struct ieee80211_sta *sta;
        struct iwl_mvm_sta *mvmsta;
        unsigned long deferred_tid_traffic;
        int queue, sta_id, tid;

        /* Check inactivity of queues */
        iwl_mvm_inactivity_check(mvm);

        mutex_lock(&mvm->mutex);

        /* Reconfigure queues requiring reconfiguation */
        for (queue = 0; queue < IWL_MAX_HW_QUEUES; queue++) {
                bool reconfig;
                bool change_owner;

                spin_lock_bh(&mvm->queue_info_lock);
                reconfig = (mvm->queue_info[queue].status ==
                            IWL_MVM_QUEUE_RECONFIGURING);

                /*
                 * We need to take into account a situation in which a TXQ was
                 * allocated to TID x, and then turned shared by adding TIDs y
                 * and z. If TID x becomes inactive and is removed from the TXQ,
                 * ownership must be given to one of the remaining TIDs.
                 * This is mainly because if TID x continues - a new queue can't
                 * be allocated for it as long as it is an owner of another TXQ.
                 */
                change_owner = !(mvm->queue_info[queue].tid_bitmap &
                                 BIT(mvm->queue_info[queue].txq_tid)) &&
                               (mvm->queue_info[queue].status ==
                                IWL_MVM_QUEUE_SHARED);
                spin_unlock_bh(&mvm->queue_info_lock);

                if (reconfig)
                        iwl_mvm_unshare_queue(mvm, queue);
                else if (change_owner)
                        iwl_mvm_change_queue_owner(mvm, queue);
        }

        /* Go over all stations with deferred traffic */
        for_each_set_bit(sta_id, mvm->sta_deferred_frames,
                         IWL_MVM_STATION_COUNT) {
                clear_bit(sta_id, mvm->sta_deferred_frames);
                sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[sta_id],
                                                lockdep_is_held(&mvm->mutex));
                if (IS_ERR_OR_NULL(sta))
                        continue;

                mvmsta = iwl_mvm_sta_from_mac80211(sta);
                deferred_tid_traffic = mvmsta->deferred_traffic_tid_map;

                for_each_set_bit(tid, &deferred_tid_traffic,
                                 IWL_MAX_TID_COUNT + 1)
                        iwl_mvm_tx_deferred_stream(mvm, sta, tid);
        }

        mutex_unlock(&mvm->mutex);
}

static int iwl_mvm_reserve_sta_stream(struct iwl_mvm *mvm,
                                      struct ieee80211_sta *sta,
                                      enum nl80211_iftype vif_type)
{
        struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
        int queue;

        /*
         * Check for inactive queues, so we don't reach a situation where we
         * can't add a STA due to a shortage in queues that doesn't really exist
         */
        iwl_mvm_inactivity_check(mvm);

        spin_lock_bh(&mvm->queue_info_lock);

        /* Make sure we have free resources for this STA */
        if (vif_type == NL80211_IFTYPE_STATION && !sta->tdls &&
            !mvm->queue_info[IWL_MVM_DQA_BSS_CLIENT_QUEUE].hw_queue_refcount &&
            (mvm->queue_info[IWL_MVM_DQA_BSS_CLIENT_QUEUE].status ==
             IWL_MVM_QUEUE_FREE))
                queue = IWL_MVM_DQA_BSS_CLIENT_QUEUE;
        else
                queue = iwl_mvm_find_free_queue(mvm, mvmsta->sta_id,
                                                IWL_MVM_DQA_MIN_DATA_QUEUE,
                                                IWL_MVM_DQA_MAX_DATA_QUEUE);
        if (queue < 0) {
                spin_unlock_bh(&mvm->queue_info_lock);
                IWL_ERR(mvm, "No available queues for new station\n");
                return -ENOSPC;
        }
        mvm->queue_info[queue].status = IWL_MVM_QUEUE_RESERVED;

        spin_unlock_bh(&mvm->queue_info_lock);

        mvmsta->reserved_queue = queue;

        IWL_DEBUG_TX_QUEUES(mvm, "Reserving data queue #%d for sta_id %d\n",
                            queue, mvmsta->sta_id);

        return 0;
}

/*
 * In DQA mode, after a HW restart the queues should be allocated as before, in
 * order to avoid race conditions when there are shared queues. This function
 * does the re-mapping and queue allocation.
 *
 * Note that re-enabling aggregations isn't done in this function.
 */
static void iwl_mvm_realloc_queues_after_restart(struct iwl_mvm *mvm,
                                                 struct iwl_mvm_sta *mvm_sta)
{
        unsigned int wdg_timeout =
                        iwl_mvm_get_wd_timeout(mvm, mvm_sta->vif, false, false);
        int i;
        struct iwl_trans_txq_scd_cfg cfg = {
                .sta_id = mvm_sta->sta_id,
                .frame_limit = IWL_FRAME_LIMIT,
        };

        /* Make sure reserved queue is still marked as such (or allocated) */
        mvm->queue_info[mvm_sta->reserved_queue].status =
                IWL_MVM_QUEUE_RESERVED;

        for (i = 0; i <= IWL_MAX_TID_COUNT; i++) {
                struct iwl_mvm_tid_data *tid_data = &mvm_sta->tid_data[i];
                int txq_id = tid_data->txq_id;
                int ac;
                u8 mac_queue;

                if (txq_id == IEEE80211_INVAL_HW_QUEUE)
                        continue;

                skb_queue_head_init(&tid_data->deferred_tx_frames);

                ac = tid_to_mac80211_ac[i];
                mac_queue = mvm_sta->vif->hw_queue[ac];

                cfg.tid = i;
                cfg.fifo = iwl_mvm_ac_to_tx_fifo[ac];
                cfg.aggregate = (txq_id >= IWL_MVM_DQA_MIN_DATA_QUEUE ||
                                 txq_id == IWL_MVM_DQA_BSS_CLIENT_QUEUE);

                IWL_DEBUG_TX_QUEUES(mvm,
                                    "Re-mapping sta %d tid %d to queue %d\n",
                                    mvm_sta->sta_id, i, txq_id);

                iwl_mvm_enable_txq(mvm, txq_id, mac_queue,
                                   IEEE80211_SEQ_TO_SN(tid_data->seq_number),
                                   &cfg, wdg_timeout);

                mvm->queue_info[txq_id].status = IWL_MVM_QUEUE_READY;
        }

        atomic_set(&mvm->pending_frames[mvm_sta->sta_id], 0);
}

int iwl_mvm_add_sta(struct iwl_mvm *mvm,
                    struct ieee80211_vif *vif,
                    struct ieee80211_sta *sta)
{
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
        struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
        struct iwl_mvm_rxq_dup_data *dup_data;
        int i, ret, sta_id;

        lockdep_assert_held(&mvm->mutex);

        if (!test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status))
                sta_id = iwl_mvm_find_free_sta_id(mvm,
                                                  ieee80211_vif_type_p2p(vif));
        else
                sta_id = mvm_sta->sta_id;

        if (sta_id == IWL_MVM_STATION_COUNT)
                return -ENOSPC;

        spin_lock_init(&mvm_sta->lock);

        /* In DQA mode, if this is a HW restart, re-alloc existing queues */
        if (iwl_mvm_is_dqa_supported(mvm) &&
            test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status)) {
                iwl_mvm_realloc_queues_after_restart(mvm, mvm_sta);
                goto update_fw;
        }

        mvm_sta->sta_id = sta_id;
        mvm_sta->mac_id_n_color = FW_CMD_ID_AND_COLOR(mvmvif->id,
                                                      mvmvif->color);
        mvm_sta->vif = vif;
        mvm_sta->max_agg_bufsize = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
        mvm_sta->tx_protection = 0;
        mvm_sta->tt_tx_protection = false;

        /* HW restart, don't assume the memory has been zeroed */
        atomic_set(&mvm->pending_frames[sta_id], 0);
        mvm_sta->tid_disable_agg = 0xffff; /* No aggs at first */
        mvm_sta->tfd_queue_msk = 0;

        /*
         * Allocate new queues for a TDLS station, unless we're in DQA mode,
         * and then they'll be allocated dynamically
         */
        if (!iwl_mvm_is_dqa_supported(mvm) && sta->tdls) {
                ret = iwl_mvm_tdls_sta_init(mvm, sta);
                if (ret)
                        return ret;
        } else if (!iwl_mvm_is_dqa_supported(mvm)) {
                for (i = 0; i < IEEE80211_NUM_ACS; i++)
                        if (vif->hw_queue[i] != IEEE80211_INVAL_HW_QUEUE)
                                mvm_sta->tfd_queue_msk |= BIT(vif->hw_queue[i]);
        }

        /* for HW restart - reset everything but the sequence number */
        for (i = 0; i <= IWL_MAX_TID_COUNT; i++) {
                u16 seq = mvm_sta->tid_data[i].seq_number;
                memset(&mvm_sta->tid_data[i], 0, sizeof(mvm_sta->tid_data[i]));
                mvm_sta->tid_data[i].seq_number = seq;

                if (!iwl_mvm_is_dqa_supported(mvm))
                        continue;

                /*
                 * Mark all queues for this STA as unallocated and defer TX
                 * frames until the queue is allocated
                 */
                mvm_sta->tid_data[i].txq_id = IEEE80211_INVAL_HW_QUEUE;
                skb_queue_head_init(&mvm_sta->tid_data[i].deferred_tx_frames);
        }
        mvm_sta->deferred_traffic_tid_map = 0;
        mvm_sta->agg_tids = 0;

        if (iwl_mvm_has_new_rx_api(mvm) &&
            !test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status)) {
                dup_data = kcalloc(mvm->trans->num_rx_queues,
                                   sizeof(*dup_data),
                                   GFP_KERNEL);
                if (!dup_data)
                        return -ENOMEM;
                mvm_sta->dup_data = dup_data;
        }

        if (iwl_mvm_is_dqa_supported(mvm)) {
                ret = iwl_mvm_reserve_sta_stream(mvm, sta,
                                                 ieee80211_vif_type_p2p(vif));
                if (ret)
                        goto err;
        }

update_fw:
        ret = iwl_mvm_sta_send_to_fw(mvm, sta, false, 0);
        if (ret)
                goto err;

        if (vif->type == NL80211_IFTYPE_STATION) {
                if (!sta->tdls) {
                        WARN_ON(mvmvif->ap_sta_id != IWL_MVM_STATION_COUNT);
                        mvmvif->ap_sta_id = sta_id;
                } else {
                        WARN_ON(mvmvif->ap_sta_id == IWL_MVM_STATION_COUNT);
                }
        }

        rcu_assign_pointer(mvm->fw_id_to_mac_id[sta_id], sta);

        return 0;

err:
        if (!iwl_mvm_is_dqa_supported(mvm) && sta->tdls)
                iwl_mvm_tdls_sta_deinit(mvm, sta);
        return ret;
}

int iwl_mvm_drain_sta(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
                      bool drain)
{
        struct iwl_mvm_add_sta_cmd cmd = {};
        int ret;
        u32 status;

        lockdep_assert_held(&mvm->mutex);

        cmd.mac_id_n_color = cpu_to_le32(mvmsta->mac_id_n_color);
        cmd.sta_id = mvmsta->sta_id;
        cmd.add_modify = STA_MODE_MODIFY;
        cmd.station_flags = drain ? cpu_to_le32(STA_FLG_DRAIN_FLOW) : 0;
        cmd.station_flags_msk = cpu_to_le32(STA_FLG_DRAIN_FLOW);

        status = ADD_STA_SUCCESS;
        ret = iwl_mvm_send_cmd_pdu_status(mvm, ADD_STA,
                                          iwl_mvm_add_sta_cmd_size(mvm),
                                          &cmd, &status);
        if (ret)
                return ret;

        switch (status & IWL_ADD_STA_STATUS_MASK) {
        case ADD_STA_SUCCESS:
                IWL_DEBUG_INFO(mvm, "Frames for staid %d will drained in fw\n",
                               mvmsta->sta_id);
                break;
        default:
                ret = -EIO;
                IWL_ERR(mvm, "Couldn't drain frames for staid %d\n",
                        mvmsta->sta_id);
                break;
        }

        return ret;
}

/*
 * Remove a station from the FW table. Before sending the command to remove
 * the station validate that the station is indeed known to the driver (sanity
 * only).
 */
static int iwl_mvm_rm_sta_common(struct iwl_mvm *mvm, u8 sta_id)
{
        struct ieee80211_sta *sta;
        struct iwl_mvm_rm_sta_cmd rm_sta_cmd = {
                .sta_id = sta_id,
        };
        int ret;

        sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[sta_id],
                                        lockdep_is_held(&mvm->mutex));

        /* Note: internal stations are marked as error values */
        if (!sta) {
                IWL_ERR(mvm, "Invalid station id\n");
                return -EINVAL;
        }

        ret = iwl_mvm_send_cmd_pdu(mvm, REMOVE_STA, 0,
                                   sizeof(rm_sta_cmd), &rm_sta_cmd);
        if (ret) {
                IWL_ERR(mvm, "Failed to remove station. Id=%d\n", sta_id);
                return ret;
        }

        return 0;
}

void iwl_mvm_sta_drained_wk(struct work_struct *wk)
{
        struct iwl_mvm *mvm = container_of(wk, struct iwl_mvm, sta_drained_wk);
        u8 sta_id;

        /*
         * The mutex is needed because of the SYNC cmd, but not only: if the
         * work would run concurrently with iwl_mvm_rm_sta, it would run before
         * iwl_mvm_rm_sta sets the station as busy, and exit. Then
         * iwl_mvm_rm_sta would set the station as busy, and nobody will clean
         * that later.
         */
        mutex_lock(&mvm->mutex);

        for_each_set_bit(sta_id, mvm->sta_drained, IWL_MVM_STATION_COUNT) {
                int ret;
                struct ieee80211_sta *sta =
                        rcu_dereference_protected(mvm->fw_id_to_mac_id[sta_id],
                                                  lockdep_is_held(&mvm->mutex));

                /*
                 * This station is in use or RCU-removed; the latter happens in
                 * managed mode, where mac80211 removes the station before we
                 * can remove it from firmware (we can only do that after the
                 * MAC is marked unassociated), and possibly while the deauth
                 * frame to disconnect from the AP is still queued. Then, the
                 * station pointer is -ENOENT when the last skb is reclaimed.
                 */
                if (!IS_ERR(sta) || PTR_ERR(sta) == -ENOENT)
                        continue;

                if (PTR_ERR(sta) == -EINVAL) {
                        IWL_ERR(mvm, "Drained sta %d, but it is internal?\n",
                                sta_id);
                        continue;
                }

                if (!sta) {
                        IWL_ERR(mvm, "Drained sta %d, but it was NULL?\n",
                                sta_id);
                        continue;
                }

                WARN_ON(PTR_ERR(sta) != -EBUSY);
                /* This station was removed and we waited until it got drained,
                 * we can now proceed and remove it.
                 */
                ret = iwl_mvm_rm_sta_common(mvm, sta_id);
                if (ret) {
                        IWL_ERR(mvm,
                                "Couldn't remove sta %d after it was drained\n",
                                sta_id);
                        continue;
                }
                RCU_INIT_POINTER(mvm->fw_id_to_mac_id[sta_id], NULL);
                clear_bit(sta_id, mvm->sta_drained);

                if (mvm->tfd_drained[sta_id]) {
                        unsigned long i, msk = mvm->tfd_drained[sta_id];

                        for_each_set_bit(i, &msk, sizeof(msk) * BITS_PER_BYTE)
                                iwl_mvm_disable_txq(mvm, i, i,
                                                    IWL_MAX_TID_COUNT, 0);

                        mvm->tfd_drained[sta_id] = 0;
                        IWL_DEBUG_TDLS(mvm, "Drained sta %d, with queues %ld\n",
                                       sta_id, msk);
                }
        }

        mutex_unlock(&mvm->mutex);
}

static void iwl_mvm_disable_sta_queues(struct iwl_mvm *mvm,
                                       struct ieee80211_vif *vif,
                                       struct iwl_mvm_sta *mvm_sta)
{
        int ac;
        int i;

        lockdep_assert_held(&mvm->mutex);

        for (i = 0; i < ARRAY_SIZE(mvm_sta->tid_data); i++) {
                if (mvm_sta->tid_data[i].txq_id == IEEE80211_INVAL_HW_QUEUE)
                        continue;

                ac = iwl_mvm_tid_to_ac_queue(i);
                iwl_mvm_disable_txq(mvm, mvm_sta->tid_data[i].txq_id,
                                    vif->hw_queue[ac], i, 0);
                mvm_sta->tid_data[i].txq_id = IEEE80211_INVAL_HW_QUEUE;
        }
}

int iwl_mvm_rm_sta(struct iwl_mvm *mvm,
                   struct ieee80211_vif *vif,
                   struct ieee80211_sta *sta)
{
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
        struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
        int ret;

        lockdep_assert_held(&mvm->mutex);

        if (iwl_mvm_has_new_rx_api(mvm))
                kfree(mvm_sta->dup_data);

        if ((vif->type == NL80211_IFTYPE_STATION &&
             mvmvif->ap_sta_id == mvm_sta->sta_id) ||
            iwl_mvm_is_dqa_supported(mvm)){
                ret = iwl_mvm_drain_sta(mvm, mvm_sta, true);
                if (ret)
                        return ret;
                /* flush its queues here since we are freeing mvm_sta */
                ret = iwl_mvm_flush_tx_path(mvm, mvm_sta->tfd_queue_msk, 0);
                if (ret)
                        return ret;
                ret = iwl_trans_wait_tx_queue_empty(mvm->trans,
                                                    mvm_sta->tfd_queue_msk);
                if (ret)
                        return ret;
                ret = iwl_mvm_drain_sta(mvm, mvm_sta, false);

                /* If DQA is supported - the queues can be disabled now */
                if (iwl_mvm_is_dqa_supported(mvm)) {
                        u8 reserved_txq = mvm_sta->reserved_queue;
                        enum iwl_mvm_queue_status *status;

                        iwl_mvm_disable_sta_queues(mvm, vif, mvm_sta);

                        /*
                         * If no traffic has gone through the reserved TXQ - it
                         * is still marked as IWL_MVM_QUEUE_RESERVED, and
                         * should be manually marked as free again
                         */
                        spin_lock_bh(&mvm->queue_info_lock);
                        status = &mvm->queue_info[reserved_txq].status;
                        if (WARN((*status != IWL_MVM_QUEUE_RESERVED) &&
                                 (*status != IWL_MVM_QUEUE_FREE),
                                 "sta_id %d reserved txq %d status %d",
                                 mvm_sta->sta_id, reserved_txq, *status)) {
                                spin_unlock_bh(&mvm->queue_info_lock);
                                return -EINVAL;
                        }

                        *status = IWL_MVM_QUEUE_FREE;
                        spin_unlock_bh(&mvm->queue_info_lock);
                }

                if (vif->type == NL80211_IFTYPE_STATION &&
                    mvmvif->ap_sta_id == mvm_sta->sta_id) {
                        /* if associated - we can't remove the AP STA now */
                        if (vif->bss_conf.assoc)
                                return ret;

                        /* unassoc - go ahead - remove the AP STA now */
                        mvmvif->ap_sta_id = IWL_MVM_STATION_COUNT;

                        /* clear d0i3_ap_sta_id if no longer relevant */
                        if (mvm->d0i3_ap_sta_id == mvm_sta->sta_id)
                                mvm->d0i3_ap_sta_id = IWL_MVM_STATION_COUNT;
                }
        }

        /*
         * This shouldn't happen - the TDLS channel switch should be canceled
         * before the STA is removed.
         */
        if (WARN_ON_ONCE(mvm->tdls_cs.peer.sta_id == mvm_sta->sta_id)) {
                mvm->tdls_cs.peer.sta_id = IWL_MVM_STATION_COUNT;
                cancel_delayed_work(&mvm->tdls_cs.dwork);
        }

        /*
         * Make sure that the tx response code sees the station as -EBUSY and
         * calls the drain worker.
         */
        spin_lock_bh(&mvm_sta->lock);
        /*
         * There are frames pending on the AC queues for this station.
         * We need to wait until all the frames are drained...
         */
        if (atomic_read(&mvm->pending_frames[mvm_sta->sta_id])) {
                rcu_assign_pointer(mvm->fw_id_to_mac_id[mvm_sta->sta_id],
                                   ERR_PTR(-EBUSY));
                spin_unlock_bh(&mvm_sta->lock);

                /* disable TDLS sta queues on drain complete */
                if (sta->tdls) {
                        mvm->tfd_drained[mvm_sta->sta_id] =
                                                        mvm_sta->tfd_queue_msk;
                        IWL_DEBUG_TDLS(mvm, "Draining TDLS sta %d\n",
                                       mvm_sta->sta_id);
                }

                ret = iwl_mvm_drain_sta(mvm, mvm_sta, true);
        } else {
                spin_unlock_bh(&mvm_sta->lock);

                if (!iwl_mvm_is_dqa_supported(mvm) && sta->tdls)
                        iwl_mvm_tdls_sta_deinit(mvm, sta);

                ret = iwl_mvm_rm_sta_common(mvm, mvm_sta->sta_id);
                RCU_INIT_POINTER(mvm->fw_id_to_mac_id[mvm_sta->sta_id], NULL);
        }

        return ret;
}

int iwl_mvm_rm_sta_id(struct iwl_mvm *mvm,
                      struct ieee80211_vif *vif,
                      u8 sta_id)
{
        int ret = iwl_mvm_rm_sta_common(mvm, sta_id);

        lockdep_assert_held(&mvm->mutex);

        RCU_INIT_POINTER(mvm->fw_id_to_mac_id[sta_id], NULL);
        return ret;
}

int iwl_mvm_allocate_int_sta(struct iwl_mvm *mvm,
                             struct iwl_mvm_int_sta *sta,
                             u32 qmask, enum nl80211_iftype iftype)
{
        if (!test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status)) {
                sta->sta_id = iwl_mvm_find_free_sta_id(mvm, iftype);
                if (WARN_ON_ONCE(sta->sta_id == IWL_MVM_STATION_COUNT))
                        return -ENOSPC;
        }

        sta->tfd_queue_msk = qmask;

        /* put a non-NULL value so iterating over the stations won't stop */
        rcu_assign_pointer(mvm->fw_id_to_mac_id[sta->sta_id], ERR_PTR(-EINVAL));
        return 0;
}

static void iwl_mvm_dealloc_int_sta(struct iwl_mvm *mvm,
                                    struct iwl_mvm_int_sta *sta)
{
        RCU_INIT_POINTER(mvm->fw_id_to_mac_id[sta->sta_id], NULL);
        memset(sta, 0, sizeof(struct iwl_mvm_int_sta));
        sta->sta_id = IWL_MVM_STATION_COUNT;
}

static int iwl_mvm_add_int_sta_common(struct iwl_mvm *mvm,
                                      struct iwl_mvm_int_sta *sta,
                                      const u8 *addr,
                                      u16 mac_id, u16 color)
{
        struct iwl_mvm_add_sta_cmd cmd;
        int ret;
        u32 status;

        lockdep_assert_held(&mvm->mutex);

        memset(&cmd, 0, sizeof(cmd));
        cmd.sta_id = sta->sta_id;
        cmd.mac_id_n_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(mac_id,
                                                             color));

        cmd.tfd_queue_msk = cpu_to_le32(sta->tfd_queue_msk);
        cmd.tid_disable_tx = cpu_to_le16(0xffff);

        if (addr)
                memcpy(cmd.addr, addr, ETH_ALEN);

        ret = iwl_mvm_send_cmd_pdu_status(mvm, ADD_STA,
                                          iwl_mvm_add_sta_cmd_size(mvm),
                                          &cmd, &status);
        if (ret)
                return ret;

        switch (status & IWL_ADD_STA_STATUS_MASK) {
        case ADD_STA_SUCCESS:
                IWL_DEBUG_INFO(mvm, "Internal station added.\n");
                return 0;
        default:
                ret = -EIO;
                IWL_ERR(mvm, "Add internal station failed, status=0x%x\n",
                        status);
                break;
        }
        return ret;
}

int iwl_mvm_add_aux_sta(struct iwl_mvm *mvm)
{
        unsigned int wdg_timeout = iwlmvm_mod_params.tfd_q_hang_detect ?
                                        mvm->cfg->base_params->wd_timeout :
                                        IWL_WATCHDOG_DISABLED;
        int ret;

        lockdep_assert_held(&mvm->mutex);

        /* Map Aux queue to fifo - needs to happen before adding Aux station */
        if (!iwl_mvm_is_dqa_supported(mvm))
                iwl_mvm_enable_ac_txq(mvm, mvm->aux_queue, mvm->aux_queue,
                                      IWL_MVM_TX_FIFO_MCAST, 0, wdg_timeout);

        /* Allocate aux station and assign to it the aux queue */
        ret = iwl_mvm_allocate_int_sta(mvm, &mvm->aux_sta, BIT(mvm->aux_queue),
                                       NL80211_IFTYPE_UNSPECIFIED);
        if (ret)
                return ret;

        if (iwl_mvm_is_dqa_supported(mvm)) {
                struct iwl_trans_txq_scd_cfg cfg = {
                        .fifo = IWL_MVM_TX_FIFO_MCAST,
                        .sta_id = mvm->aux_sta.sta_id,
                        .tid = IWL_MAX_TID_COUNT,
                        .aggregate = false,
                        .frame_limit = IWL_FRAME_LIMIT,
                };

                iwl_mvm_enable_txq(mvm, mvm->aux_queue, mvm->aux_queue, 0, &cfg,
                                   wdg_timeout);
        }

        ret = iwl_mvm_add_int_sta_common(mvm, &mvm->aux_sta, NULL,
                                         MAC_INDEX_AUX, 0);

        if (ret)
                iwl_mvm_dealloc_int_sta(mvm, &mvm->aux_sta);
        return ret;
}

int iwl_mvm_add_snif_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
{
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);

        lockdep_assert_held(&mvm->mutex);
        return iwl_mvm_add_int_sta_common(mvm, &mvm->snif_sta, vif->addr,
                                         mvmvif->id, 0);
}

int iwl_mvm_rm_snif_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
{
        int ret;

        lockdep_assert_held(&mvm->mutex);

        ret = iwl_mvm_rm_sta_common(mvm, mvm->snif_sta.sta_id);
        if (ret)
                IWL_WARN(mvm, "Failed sending remove station\n");

        return ret;
}

void iwl_mvm_dealloc_snif_sta(struct iwl_mvm *mvm)
{
        iwl_mvm_dealloc_int_sta(mvm, &mvm->snif_sta);
}

void iwl_mvm_del_aux_sta(struct iwl_mvm *mvm)
{
        lockdep_assert_held(&mvm->mutex);

        iwl_mvm_dealloc_int_sta(mvm, &mvm->aux_sta);
}

/*
 * Send the add station command for the vif's broadcast station.
 * Assumes that the station was already allocated.
 *
 * @mvm: the mvm component
 * @vif: the interface to which the broadcast station is added
 * @bsta: the broadcast station to add.
 */
int iwl_mvm_send_add_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
{
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
        struct iwl_mvm_int_sta *bsta = &mvmvif->bcast_sta;
        static const u8 _baddr[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
        const u8 *baddr = _baddr;

        lockdep_assert_held(&mvm->mutex);

        if (iwl_mvm_is_dqa_supported(mvm)) {
                struct iwl_trans_txq_scd_cfg cfg = {
                        .fifo = IWL_MVM_TX_FIFO_VO,
                        .sta_id = mvmvif->bcast_sta.sta_id,
                        .tid = IWL_MAX_TID_COUNT,
                        .aggregate = false,
                        .frame_limit = IWL_FRAME_LIMIT,
                };
                unsigned int wdg_timeout =
                        iwl_mvm_get_wd_timeout(mvm, vif, false, false);
                int queue;

                if ((vif->type == NL80211_IFTYPE_AP) &&
                    (mvmvif->bcast_sta.tfd_queue_msk &
                     BIT(IWL_MVM_DQA_AP_PROBE_RESP_QUEUE)))
                        queue = IWL_MVM_DQA_AP_PROBE_RESP_QUEUE;
                else if ((vif->type == NL80211_IFTYPE_P2P_DEVICE) &&
                         (mvmvif->bcast_sta.tfd_queue_msk &
                          BIT(IWL_MVM_DQA_P2P_DEVICE_QUEUE)))
                        queue = IWL_MVM_DQA_P2P_DEVICE_QUEUE;
                else if (WARN(1, "Missed required TXQ for adding bcast STA\n"))
                        return -EINVAL;

                iwl_mvm_enable_txq(mvm, queue, vif->hw_queue[0], 0, &cfg,
                                   wdg_timeout);
        }

        if (vif->type == NL80211_IFTYPE_ADHOC)
                baddr = vif->bss_conf.bssid;

        if (WARN_ON_ONCE(bsta->sta_id == IWL_MVM_STATION_COUNT))
                return -ENOSPC;

        return iwl_mvm_add_int_sta_common(mvm, bsta, baddr,
                                          mvmvif->id, mvmvif->color);
}

/* Send the FW a request to remove the station from it's internal data
 * structures, but DO NOT remove the entry from the local data structures. */
int iwl_mvm_send_rm_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
{
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
        int ret;

        lockdep_assert_held(&mvm->mutex);

        ret = iwl_mvm_rm_sta_common(mvm, mvmvif->bcast_sta.sta_id);
        if (ret)
                IWL_WARN(mvm, "Failed sending remove station\n");
        return ret;
}

int iwl_mvm_alloc_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
{
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
        u32 qmask = 0;

        lockdep_assert_held(&mvm->mutex);

        if (!iwl_mvm_is_dqa_supported(mvm))
                qmask = iwl_mvm_mac_get_queues_mask(vif);

        if (vif->type == NL80211_IFTYPE_AP) {
                /*
                 * The firmware defines the TFD queue mask to only be relevant
                 * for *unicast* queues, so the multicast (CAB) queue shouldn't
                 * be included.
                 */
                qmask &= ~BIT(vif->cab_queue);

                if (iwl_mvm_is_dqa_supported(mvm))
                        qmask |= BIT(IWL_MVM_DQA_AP_PROBE_RESP_QUEUE);
        } else if (iwl_mvm_is_dqa_supported(mvm) &&
                   vif->type == NL80211_IFTYPE_P2P_DEVICE) {
                qmask |= BIT(IWL_MVM_DQA_P2P_DEVICE_QUEUE);
        }

        return iwl_mvm_allocate_int_sta(mvm, &mvmvif->bcast_sta, qmask,
                                        ieee80211_vif_type_p2p(vif));
}

/* Allocate a new station entry for the broadcast station to the given vif,
 * and send it to the FW.
 * Note that each P2P mac should have its own broadcast station.
 *
 * @mvm: the mvm component
 * @vif: the interface to which the broadcast station is added
 * @bsta: the broadcast station to add. */
int iwl_mvm_add_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
{
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
        struct iwl_mvm_int_sta *bsta = &mvmvif->bcast_sta;
        int ret;

        lockdep_assert_held(&mvm->mutex);

        ret = iwl_mvm_alloc_bcast_sta(mvm, vif);
        if (ret)
                return ret;

        ret = iwl_mvm_send_add_bcast_sta(mvm, vif);

        if (ret)
                iwl_mvm_dealloc_int_sta(mvm, bsta);

        return ret;
}

void iwl_mvm_dealloc_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
{
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);

        iwl_mvm_dealloc_int_sta(mvm, &mvmvif->bcast_sta);
}

/*
 * Send the FW a request to remove the station from it's internal data
 * structures, and in addition remove it from the local data structure.
 */
int iwl_mvm_rm_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
{
        int ret;

        lockdep_assert_held(&mvm->mutex);

        ret = iwl_mvm_send_rm_bcast_sta(mvm, vif);

        iwl_mvm_dealloc_bcast_sta(mvm, vif);

        return ret;
}

#define IWL_MAX_RX_BA_SESSIONS 16

static void iwl_mvm_sync_rxq_del_ba(struct iwl_mvm *mvm, u8 baid)
{
        struct iwl_mvm_delba_notif notif = {
                .metadata.type = IWL_MVM_RXQ_NOTIF_DEL_BA,
                .metadata.sync = 1,
                .delba.baid = baid,
        };
        iwl_mvm_sync_rx_queues_internal(mvm, (void *)&notif, sizeof(notif));
};

static void iwl_mvm_free_reorder(struct iwl_mvm *mvm,
                                 struct iwl_mvm_baid_data *data)
{
        int i;

        iwl_mvm_sync_rxq_del_ba(mvm, data->baid);

        for (i = 0; i < mvm->trans->num_rx_queues; i++) {
                int j;
                struct iwl_mvm_reorder_buffer *reorder_buf =
                        &data->reorder_buf[i];

                spin_lock_bh(&reorder_buf->lock);
                if (likely(!reorder_buf->num_stored)) {
                        spin_unlock_bh(&reorder_buf->lock);
                        continue;
                }

                /*
                 * This shouldn't happen in regular DELBA since the internal
                 * delBA notification should trigger a release of all frames in
                 * the reorder buffer.
                 */
                WARN_ON(1);

                for (j = 0; j < reorder_buf->buf_size; j++)
                        __skb_queue_purge(&reorder_buf->entries[j]);
                /*
                 * Prevent timer re-arm. This prevents a very far fetched case
                 * where we timed out on the notification. There may be prior
                 * RX frames pending in the RX queue before the notification
                 * that might get processed between now and the actual deletion
                 * and we would re-arm the timer although we are deleting the
                 * reorder buffer.
                 */
                reorder_buf->removed = true;
                spin_unlock_bh(&reorder_buf->lock);
                del_timer_sync(&reorder_buf->reorder_timer);
        }
}

static void iwl_mvm_init_reorder_buffer(struct iwl_mvm *mvm,
                                        u32 sta_id,
                                        struct iwl_mvm_baid_data *data,
                                        u16 ssn, u8 buf_size)
{
        int i;

        for (i = 0; i < mvm->trans->num_rx_queues; i++) {
                struct iwl_mvm_reorder_buffer *reorder_buf =
                        &data->reorder_buf[i];
                int j;

                reorder_buf->num_stored = 0;
                reorder_buf->head_sn = ssn;
                reorder_buf->buf_size = buf_size;
                /* rx reorder timer */
                reorder_buf->reorder_timer.function =
                        iwl_mvm_reorder_timer_expired;
                reorder_buf->reorder_timer.data = (unsigned long)reorder_buf;
                init_timer(&reorder_buf->reorder_timer);
                spin_lock_init(&reorder_buf->lock);
                reorder_buf->mvm = mvm;
                reorder_buf->queue = i;
                reorder_buf->sta_id = sta_id;
                for (j = 0; j < reorder_buf->buf_size; j++)
                        __skb_queue_head_init(&reorder_buf->entries[j]);
        }
}

int iwl_mvm_sta_rx_agg(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
                       int tid, u16 ssn, bool start, u8 buf_size, u16 timeout)
{
        struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
        struct iwl_mvm_add_sta_cmd cmd = {};
        struct iwl_mvm_baid_data *baid_data = NULL;
        int ret;
        u32 status;

        lockdep_assert_held(&mvm->mutex);

        if (start && mvm->rx_ba_sessions >= IWL_MAX_RX_BA_SESSIONS) {
                IWL_WARN(mvm, "Not enough RX BA SESSIONS\n");
                return -ENOSPC;
        }

        if (iwl_mvm_has_new_rx_api(mvm) && start) {
                /*
                 * Allocate here so if allocation fails we can bail out early
                 * before starting the BA session in the firmware
                 */
                baid_data = kzalloc(sizeof(*baid_data) +
                                    mvm->trans->num_rx_queues *
                                    sizeof(baid_data->reorder_buf[0]),
                                    GFP_KERNEL);
                if (!baid_data)
                        return -ENOMEM;
        }

        cmd.mac_id_n_color = cpu_to_le32(mvm_sta->mac_id_n_color);
        cmd.sta_id = mvm_sta->sta_id;
        cmd.add_modify = STA_MODE_MODIFY;
        if (start) {
                cmd.add_immediate_ba_tid = (u8) tid;
                cmd.add_immediate_ba_ssn = cpu_to_le16(ssn);
                cmd.rx_ba_window = cpu_to_le16((u16)buf_size);
        } else {
                cmd.remove_immediate_ba_tid = (u8) tid;
        }
        cmd.modify_mask = start ? STA_MODIFY_ADD_BA_TID :

                                  STA_MODIFY_REMOVE_BA_TID;

        status = ADD_STA_SUCCESS;
        ret = iwl_mvm_send_cmd_pdu_status(mvm, ADD_STA,
                                          iwl_mvm_add_sta_cmd_size(mvm),
                                          &cmd, &status);
        if (ret)
                goto out_free;

        switch (status & IWL_ADD_STA_STATUS_MASK) {
        case ADD_STA_SUCCESS:
                IWL_DEBUG_HT(mvm, "RX BA Session %sed in fw\n",
                             start ? "start" : "stopp");
                break;
        case ADD_STA_IMMEDIATE_BA_FAILURE:
                IWL_WARN(mvm, "RX BA Session refused by fw\n");
                ret = -ENOSPC;
                break;
        default:
                ret = -EIO;
                IWL_ERR(mvm, "RX BA Session failed %sing, status 0x%x\n",
                        start ? "start" : "stopp", status);
                break;
        }

        if (ret)
                goto out_free;

        if (start) {
                u8 baid;

                mvm->rx_ba_sessions++;

                if (!iwl_mvm_has_new_rx_api(mvm))
                        return 0;

                if (WARN_ON(!(status & IWL_ADD_STA_BAID_VALID_MASK))) {
                        ret = -EINVAL;
                        goto out_free;
                }
                baid = (u8)((status & IWL_ADD_STA_BAID_MASK) >>
                            IWL_ADD_STA_BAID_SHIFT);
                baid_data->baid = baid;
                baid_data->timeout = timeout;
                baid_data->last_rx = jiffies;
                setup_timer(&baid_data->session_timer,
                            iwl_mvm_rx_agg_session_expired,
                            (unsigned long)&mvm->baid_map[baid]);
                baid_data->mvm = mvm;
                baid_data->tid = tid;
                baid_data->sta_id = mvm_sta->sta_id;

                mvm_sta->tid_to_baid[tid] = baid;
                if (timeout)
                        mod_timer(&baid_data->session_timer,
                                  TU_TO_EXP_TIME(timeout * 2));

                iwl_mvm_init_reorder_buffer(mvm, mvm_sta->sta_id,
                                            baid_data, ssn, buf_size);
                /*
                 * protect the BA data with RCU to cover a case where our
                 * internal RX sync mechanism will timeout (not that it's
                 * supposed to happen) and we will free the session data while
                 * RX is being processed in parallel
                 */
                IWL_DEBUG_HT(mvm, "Sta %d(%d) is assigned to BAID %d\n",
                             mvm_sta->sta_id, tid, baid);
                WARN_ON(rcu_access_pointer(mvm->baid_map[baid]));
                rcu_assign_pointer(mvm->baid_map[baid], baid_data);
        } else  {
                u8 baid = mvm_sta->tid_to_baid[tid];

                if (mvm->rx_ba_sessions > 0)
                        /* check that restart flow didn't zero the counter */
                        mvm->rx_ba_sessions--;
                if (!iwl_mvm_has_new_rx_api(mvm))
                        return 0;

                if (WARN_ON(baid == IWL_RX_REORDER_DATA_INVALID_BAID))
                        return -EINVAL;

                baid_data = rcu_access_pointer(mvm->baid_map[baid]);
                if (WARN_ON(!baid_data))
                        return -EINVAL;

                /* synchronize all rx queues so we can safely delete */
                iwl_mvm_free_reorder(mvm, baid_data);
                del_timer_sync(&baid_data->session_timer);
                RCU_INIT_POINTER(mvm->baid_map[baid], NULL);
                kfree_rcu(baid_data, rcu_head);
                IWL_DEBUG_HT(mvm, "BAID %d is free\n", baid);
        }
        return 0;

out_free:
        kfree(baid_data);
        return ret;
}

int iwl_mvm_sta_tx_agg(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
                       int tid, u8 queue, bool start)
{
        struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
        struct iwl_mvm_add_sta_cmd cmd = {};
        int ret;
        u32 status;

        lockdep_assert_held(&mvm->mutex);

        if (start) {
                mvm_sta->tfd_queue_msk |= BIT(queue);
                mvm_sta->tid_disable_agg &= ~BIT(tid);
        } else {
                /* In DQA-mode the queue isn't removed on agg termination */
                if (!iwl_mvm_is_dqa_supported(mvm))
                        mvm_sta->tfd_queue_msk &= ~BIT(queue);
                mvm_sta->tid_disable_agg |= BIT(tid);
        }

        cmd.mac_id_n_color = cpu_to_le32(mvm_sta->mac_id_n_color);
        cmd.sta_id = mvm_sta->sta_id;
        cmd.add_modify = STA_MODE_MODIFY;
        cmd.modify_mask = STA_MODIFY_QUEUES | STA_MODIFY_TID_DISABLE_TX;
        cmd.tfd_queue_msk = cpu_to_le32(mvm_sta->tfd_queue_msk);
        cmd.tid_disable_tx = cpu_to_le16(mvm_sta->tid_disable_agg);

        status = ADD_STA_SUCCESS;
        ret = iwl_mvm_send_cmd_pdu_status(mvm, ADD_STA,
                                          iwl_mvm_add_sta_cmd_size(mvm),
                                          &cmd, &status);
        if (ret)
                return ret;

        switch (status & IWL_ADD_STA_STATUS_MASK) {
        case ADD_STA_SUCCESS:
                break;
        default:
                ret = -EIO;
                IWL_ERR(mvm, "TX BA Session failed %sing, status 0x%x\n",
                        start ? "start" : "stopp", status);
                break;
        }

        return ret;
}

const u8 tid_to_mac80211_ac[] = {
        IEEE80211_AC_BE,
        IEEE80211_AC_BK,
        IEEE80211_AC_BK,
        IEEE80211_AC_BE,
        IEEE80211_AC_VI,
        IEEE80211_AC_VI,
        IEEE80211_AC_VO,
        IEEE80211_AC_VO,
        IEEE80211_AC_VO, /* We treat MGMT as TID 8, which is set as AC_VO */
};

static const u8 tid_to_ucode_ac[] = {
        AC_BE,
        AC_BK,
        AC_BK,
        AC_BE,
        AC_VI,
        AC_VI,
        AC_VO,
        AC_VO,
};

int iwl_mvm_sta_tx_agg_start(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
                             struct ieee80211_sta *sta, u16 tid, u16 *ssn)
{
        struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
        struct iwl_mvm_tid_data *tid_data;
        int txq_id;
        int ret;

        if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT))
                return -EINVAL;

        if (mvmsta->tid_data[tid].state != IWL_AGG_OFF) {
                IWL_ERR(mvm, "Start AGG when state is not IWL_AGG_OFF %d!\n",
                        mvmsta->tid_data[tid].state);
                return -ENXIO;
        }

        lockdep_assert_held(&mvm->mutex);

        spin_lock_bh(&mvmsta->lock);

        /* possible race condition - we entered D0i3 while starting agg */
        if (test_bit(IWL_MVM_STATUS_IN_D0I3, &mvm->status)) {
                spin_unlock_bh(&mvmsta->lock);
                IWL_ERR(mvm, "Entered D0i3 while starting Tx agg\n");
                return -EIO;
        }

        spin_lock(&mvm->queue_info_lock);

        /*
         * Note the possible cases:
         *  1. In DQA mode with an enabled TXQ - TXQ needs to become agg'ed
         *  2. Non-DQA mode: the TXQ hasn't yet been enabled, so find a free
         *      one and mark it as reserved
         *  3. In DQA mode, but no traffic yet on this TID: same treatment as in
         *      non-DQA mode, since the TXQ hasn't yet been allocated
         */
        txq_id = mvmsta->tid_data[tid].txq_id;
        if (iwl_mvm_is_dqa_supported(mvm) &&
            unlikely(mvm->queue_info[txq_id].status == IWL_MVM_QUEUE_SHARED)) {
                ret = -ENXIO;
                IWL_DEBUG_TX_QUEUES(mvm,
                                    "Can't start tid %d agg on shared queue!\n",
                                    tid);
                goto release_locks;
        } else if (!iwl_mvm_is_dqa_supported(mvm) ||
            mvm->queue_info[txq_id].status != IWL_MVM_QUEUE_READY) {
                txq_id = iwl_mvm_find_free_queue(mvm, mvmsta->sta_id,
                                                 mvm->first_agg_queue,
                                                 mvm->last_agg_queue);
                if (txq_id < 0) {
                        ret = txq_id;
                        IWL_ERR(mvm, "Failed to allocate agg queue\n");
                        goto release_locks;
                }

                /* TXQ hasn't yet been enabled, so mark it only as reserved */
                mvm->queue_info[txq_id].status = IWL_MVM_QUEUE_RESERVED;
        }

        spin_unlock(&mvm->queue_info_lock);

        IWL_DEBUG_TX_QUEUES(mvm,
                            "AGG for tid %d will be on queue #%d\n",
                            tid, txq_id);

        tid_data = &mvmsta->tid_data[tid];
        tid_data->ssn = IEEE80211_SEQ_TO_SN(tid_data->seq_number);
        tid_data->txq_id = txq_id;
        *ssn = tid_data->ssn;

        IWL_DEBUG_TX_QUEUES(mvm,
                            "Start AGG: sta %d tid %d queue %d - ssn = %d, next_recl = %d\n",
                            mvmsta->sta_id, tid, txq_id, tid_data->ssn,
                            tid_data->next_reclaimed);

        if (tid_data->ssn == tid_data->next_reclaimed) {
                tid_data->state = IWL_AGG_STARTING;
                ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
        } else {
                tid_data->state = IWL_EMPTYING_HW_QUEUE_ADDBA;
        }

        ret = 0;
        goto out;

release_locks:
        spin_unlock(&mvm->queue_info_lock);
out:
        spin_unlock_bh(&mvmsta->lock);

        return ret;
}

int iwl_mvm_sta_tx_agg_oper(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
                            struct ieee80211_sta *sta, u16 tid, u8 buf_size,
                            bool amsdu)
{
        struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
        struct iwl_mvm_tid_data *tid_data = &mvmsta->tid_data[tid];
        unsigned int wdg_timeout =
                iwl_mvm_get_wd_timeout(mvm, vif, sta->tdls, false);
        int queue, ret;
        bool alloc_queue = true;
        enum iwl_mvm_queue_status queue_status;
        u16 ssn;

        struct iwl_trans_txq_scd_cfg cfg = {
                .sta_id = mvmsta->sta_id,
                .tid = tid,
                .frame_limit = buf_size,
                .aggregate = true,
        };

        BUILD_BUG_ON((sizeof(mvmsta->agg_tids) * BITS_PER_BYTE)
                     != IWL_MAX_TID_COUNT);

        buf_size = min_t(int, buf_size, LINK_QUAL_AGG_FRAME_LIMIT_DEF);

        spin_lock_bh(&mvmsta->lock);
        ssn = tid_data->ssn;
        queue = tid_data->txq_id;
        tid_data->state = IWL_AGG_ON;
        mvmsta->agg_tids |= BIT(tid);
        tid_data->ssn = 0xffff;
        tid_data->amsdu_in_ampdu_allowed = amsdu;
        spin_unlock_bh(&mvmsta->lock);

        cfg.fifo = iwl_mvm_ac_to_tx_fifo[tid_to_mac80211_ac[tid]];

        spin_lock_bh(&mvm->queue_info_lock);
        queue_status = mvm->queue_info[queue].status;
        spin_unlock_bh(&mvm->queue_info_lock);

        /* In DQA mode, the existing queue might need to be reconfigured */
        if (iwl_mvm_is_dqa_supported(mvm)) {
                /* Maybe there is no need to even alloc a queue... */
                if (mvm->queue_info[queue].status == IWL_MVM_QUEUE_READY)
                        alloc_queue = false;

                /*
                 * Only reconfig the SCD for the queue if the window size has
                 * changed from current (become smaller)
                 */
                if (!alloc_queue && buf_size < mvmsta->max_agg_bufsize) {
                        /*
                         * If reconfiguring an existing queue, it first must be
                         * drained
                         */
                        ret = iwl_trans_wait_tx_queue_empty(mvm->trans,
                                                            BIT(queue));
                        if (ret) {
                                IWL_ERR(mvm,
                                        "Error draining queue before reconfig\n");
                                return ret;
                        }

                        ret = iwl_mvm_reconfig_scd(mvm, queue, cfg.fifo,
                                                   mvmsta->sta_id, tid,
                                                   buf_size, ssn);
                        if (ret) {
                                IWL_ERR(mvm,
                                        "Error reconfiguring TXQ #%d\n", queue);
                                return ret;
                        }
                }
        }

        if (alloc_queue)
                iwl_mvm_enable_txq(mvm, queue,
                                   vif->hw_queue[tid_to_mac80211_ac[tid]], ssn,
                                   &cfg, wdg_timeout);

        /* Send ADD_STA command to enable aggs only if the queue isn't shared */
        if (queue_status != IWL_MVM_QUEUE_SHARED) {
                ret = iwl_mvm_sta_tx_agg(mvm, sta, tid, queue, true);
                if (ret)
                        return -EIO;
        }

        /* No need to mark as reserved */
        spin_lock_bh(&mvm->queue_info_lock);
        mvm->queue_info[queue].status = IWL_MVM_QUEUE_READY;
        spin_unlock_bh(&mvm->queue_info_lock);

        /*
         * Even though in theory the peer could have different
         * aggregation reorder buffer sizes for different sessions,
         * our ucode doesn't allow for that and has a global limit
         * for each station. Therefore, use the minimum of all the
         * aggregation sessions and our default value.
         */
        mvmsta->max_agg_bufsize =
                min(mvmsta->max_agg_bufsize, buf_size);
        mvmsta->lq_sta.lq.agg_frame_cnt_limit = mvmsta->max_agg_bufsize;

        IWL_DEBUG_HT(mvm, "Tx aggregation enabled on ra = %pM tid = %d\n",
                     sta->addr, tid);

        return iwl_mvm_send_lq_cmd(mvm, &mvmsta->lq_sta.lq, false);
}

int iwl_mvm_sta_tx_agg_stop(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
                            struct ieee80211_sta *sta, u16 tid)
{
        struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
        struct iwl_mvm_tid_data *tid_data = &mvmsta->tid_data[tid];
        u16 txq_id;
        int err;

        /*
         * If mac80211 is cleaning its state, then say that we finished since
         * our state has been cleared anyway.
         */
        if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status)) {
                ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
                return 0;
        }

        spin_lock_bh(&mvmsta->lock);

        txq_id = tid_data->txq_id;

        IWL_DEBUG_TX_QUEUES(mvm, "Stop AGG: sta %d tid %d q %d state %d\n",
                            mvmsta->sta_id, tid, txq_id, tid_data->state);

        mvmsta->agg_tids &= ~BIT(tid);

        spin_lock_bh(&mvm->queue_info_lock);
        /*
         * The TXQ is marked as reserved only if no traffic came through yet
         * This means no traffic has been sent on this TID (agg'd or not), so
         * we no longer have use for the queue. Since it hasn't even been
         * allocated through iwl_mvm_enable_txq, so we can just mark it back as
         * free.
         */
        if (mvm->queue_info[txq_id].status == IWL_MVM_QUEUE_RESERVED)
                mvm->queue_info[txq_id].status = IWL_MVM_QUEUE_FREE;

        spin_unlock_bh(&mvm->queue_info_lock);

        switch (tid_data->state) {
        case IWL_AGG_ON:
                tid_data->ssn = IEEE80211_SEQ_TO_SN(tid_data->seq_number);

                IWL_DEBUG_TX_QUEUES(mvm,
                                    "ssn = %d, next_recl = %d\n",
                                    tid_data->ssn, tid_data->next_reclaimed);

                /* There are still packets for this RA / TID in the HW */
                if (tid_data->ssn != tid_data->next_reclaimed) {
                        tid_data->state = IWL_EMPTYING_HW_QUEUE_DELBA;
                        err = 0;
                        break;
                }

                tid_data->ssn = 0xffff;
                tid_data->state = IWL_AGG_OFF;
                spin_unlock_bh(&mvmsta->lock);

                ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);

                iwl_mvm_sta_tx_agg(mvm, sta, tid, txq_id, false);

                if (!iwl_mvm_is_dqa_supported(mvm)) {
                        int mac_queue = vif->hw_queue[tid_to_mac80211_ac[tid]];

                        iwl_mvm_disable_txq(mvm, txq_id, mac_queue, tid, 0);
                }
                return 0;
        case IWL_AGG_STARTING:
        case IWL_EMPTYING_HW_QUEUE_ADDBA:
                /*
                 * The agg session has been stopped before it was set up. This
                 * can happen when the AddBA timer times out for example.
                 */

                /* No barriers since we are under mutex */
                lockdep_assert_held(&mvm->mutex);

                ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
                tid_data->state = IWL_AGG_OFF;
                err = 0;
                break;
        default:
                IWL_ERR(mvm,
                        "Stopping AGG while state not ON or starting for %d on %d (%d)\n",
                        mvmsta->sta_id, tid, tid_data->state);
                IWL_ERR(mvm,
                        "\ttid_data->txq_id = %d\n", tid_data->txq_id);
                err = -EINVAL;
        }

        spin_unlock_bh(&mvmsta->lock);

        return err;
}

int iwl_mvm_sta_tx_agg_flush(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
                            struct ieee80211_sta *sta, u16 tid)
{
        struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
        struct iwl_mvm_tid_data *tid_data = &mvmsta->tid_data[tid];
        u16 txq_id;
        enum iwl_mvm_agg_state old_state;

        /*
         * First set the agg state to OFF to avoid calling
         * ieee80211_stop_tx_ba_cb in iwl_mvm_check_ratid_empty.
         */
        spin_lock_bh(&mvmsta->lock);
        txq_id = tid_data->txq_id;
        IWL_DEBUG_TX_QUEUES(mvm, "Flush AGG: sta %d tid %d q %d state %d\n",
                            mvmsta->sta_id, tid, txq_id, tid_data->state);
        old_state = tid_data->state;
        tid_data->state = IWL_AGG_OFF;
        mvmsta->agg_tids &= ~BIT(tid);
        spin_unlock_bh(&mvmsta->lock);

        spin_lock_bh(&mvm->queue_info_lock);
        /*
         * The TXQ is marked as reserved only if no traffic came through yet
         * This means no traffic has been sent on this TID (agg'd or not), so
         * we no longer have use for the queue. Since it hasn't even been
         * allocated through iwl_mvm_enable_txq, so we can just mark it back as
         * free.
         */
        if (mvm->queue_info[txq_id].status == IWL_MVM_QUEUE_RESERVED)
                mvm->queue_info[txq_id].status = IWL_MVM_QUEUE_FREE;
        spin_unlock_bh(&mvm->queue_info_lock);

        if (old_state >= IWL_AGG_ON) {
                iwl_mvm_drain_sta(mvm, mvmsta, true);
                if (iwl_mvm_flush_tx_path(mvm, BIT(txq_id), 0))
                        IWL_ERR(mvm, "Couldn't flush the AGG queue\n");
                iwl_trans_wait_tx_queue_empty(mvm->trans,
                                              mvmsta->tfd_queue_msk);
                iwl_mvm_drain_sta(mvm, mvmsta, false);

                iwl_mvm_sta_tx_agg(mvm, sta, tid, txq_id, false);

                if (!iwl_mvm_is_dqa_supported(mvm)) {
                        int mac_queue = vif->hw_queue[tid_to_mac80211_ac[tid]];

                        iwl_mvm_disable_txq(mvm, tid_data->txq_id, mac_queue,
                                            tid, 0);
                }
        }

        return 0;
}

static int iwl_mvm_set_fw_key_idx(struct iwl_mvm *mvm)
{
        int i, max = -1, max_offs = -1;

        lockdep_assert_held(&mvm->mutex);

        /* Pick the unused key offset with the highest 'deleted'
         * counter. Every time a key is deleted, all the counters
         * are incremented and the one that was just deleted is
         * reset to zero. Thus, the highest counter is the one
         * that was deleted longest ago. Pick that one.
         */
        for (i = 0; i < STA_KEY_MAX_NUM; i++) {
                if (test_bit(i, mvm->fw_key_table))
                        continue;
                if (mvm->fw_key_deleted[i] > max) {
                        max = mvm->fw_key_deleted[i];
                        max_offs = i;
                }
        }

        if (max_offs < 0)
                return STA_KEY_IDX_INVALID;

        return max_offs;
}

static struct iwl_mvm_sta *iwl_mvm_get_key_sta(struct iwl_mvm *mvm,
                                               struct ieee80211_vif *vif,
                                               struct ieee80211_sta *sta)
{
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);

        if (sta)
                return iwl_mvm_sta_from_mac80211(sta);

        /*
         * The device expects GTKs for station interfaces to be
         * installed as GTKs for the AP station. If we have no
         * station ID, then use AP's station ID.
         */
        if (vif->type == NL80211_IFTYPE_STATION &&
            mvmvif->ap_sta_id != IWL_MVM_STATION_COUNT) {
                u8 sta_id = mvmvif->ap_sta_id;

                sta = rcu_dereference_check(mvm->fw_id_to_mac_id[sta_id],
                                            lockdep_is_held(&mvm->mutex));

                /*
                 * It is possible that the 'sta' parameter is NULL,
                 * for example when a GTK is removed - the sta_id will then
                 * be the AP ID, and no station was passed by mac80211.
                 */
                if (IS_ERR_OR_NULL(sta))
                        return NULL;

                return iwl_mvm_sta_from_mac80211(sta);
        }

        return NULL;
}

static int iwl_mvm_send_sta_key(struct iwl_mvm *mvm,
                                struct iwl_mvm_sta *mvm_sta,
                                struct ieee80211_key_conf *keyconf, bool mcast,
                                u32 tkip_iv32, u16 *tkip_p1k, u32 cmd_flags,
                                u8 key_offset)
{
        struct iwl_mvm_add_sta_key_cmd cmd = {};
        __le16 key_flags;
        int ret;
        u32 status;
        u16 keyidx;
        int i;
        u8 sta_id = mvm_sta->sta_id;

        keyidx = (keyconf->keyidx << STA_KEY_FLG_KEYID_POS) &
                 STA_KEY_FLG_KEYID_MSK;
        key_flags = cpu_to_le16(keyidx);
        key_flags |= cpu_to_le16(STA_KEY_FLG_WEP_KEY_MAP);

        switch (keyconf->cipher) {
        case WLAN_CIPHER_SUITE_TKIP:
                key_flags |= cpu_to_le16(STA_KEY_FLG_TKIP);
                cmd.tkip_rx_tsc_byte2 = tkip_iv32;
                for (i = 0; i < 5; i++)
                        cmd.tkip_rx_ttak[i] = cpu_to_le16(tkip_p1k[i]);
                memcpy(cmd.key, keyconf->key, keyconf->keylen);
                break;
        case WLAN_CIPHER_SUITE_CCMP:
                key_flags |= cpu_to_le16(STA_KEY_FLG_CCM);
                memcpy(cmd.key, keyconf->key, keyconf->keylen);
                break;
        case WLAN_CIPHER_SUITE_WEP104:
                key_flags |= cpu_to_le16(STA_KEY_FLG_WEP_13BYTES);
                /* fall through */
        case WLAN_CIPHER_SUITE_WEP40:
                key_flags |= cpu_to_le16(STA_KEY_FLG_WEP);
                memcpy(cmd.key + 3, keyconf->key, keyconf->keylen);
                break;
        case WLAN_CIPHER_SUITE_GCMP_256:
                key_flags |= cpu_to_le16(STA_KEY_FLG_KEY_32BYTES);
                /* fall through */
        case WLAN_CIPHER_SUITE_GCMP:
                key_flags |= cpu_to_le16(STA_KEY_FLG_GCMP);
                memcpy(cmd.key, keyconf->key, keyconf->keylen);
                break;
        default:
                key_flags |= cpu_to_le16(STA_KEY_FLG_EXT);
                memcpy(cmd.key, keyconf->key, keyconf->keylen);
        }

        if (mcast)
                key_flags |= cpu_to_le16(STA_KEY_MULTICAST);

        cmd.key_offset = key_offset;
        cmd.key_flags = key_flags;
        cmd.sta_id = sta_id;

        status = ADD_STA_SUCCESS;
        if (cmd_flags & CMD_ASYNC)
                ret =  iwl_mvm_send_cmd_pdu(mvm, ADD_STA_KEY, CMD_ASYNC,
                                            sizeof(cmd), &cmd);
        else
                ret = iwl_mvm_send_cmd_pdu_status(mvm, ADD_STA_KEY, sizeof(cmd),
                                                  &cmd, &status);

        switch (status) {
        case ADD_STA_SUCCESS:
                IWL_DEBUG_WEP(mvm, "MODIFY_STA: set dynamic key passed\n");
                break;
        default:
                ret = -EIO;
                IWL_ERR(mvm, "MODIFY_STA: set dynamic key failed\n");
                break;
        }

        return ret;
}

static int iwl_mvm_send_sta_igtk(struct iwl_mvm *mvm,
                                 struct ieee80211_key_conf *keyconf,
                                 u8 sta_id, bool remove_key)
{
        struct iwl_mvm_mgmt_mcast_key_cmd igtk_cmd = {};

        /* verify the key details match the required command's expectations */
        if (WARN_ON((keyconf->flags & IEEE80211_KEY_FLAG_PAIRWISE) ||
                    (keyconf->keyidx != 4 && keyconf->keyidx != 5) ||
                    (keyconf->cipher != WLAN_CIPHER_SUITE_AES_CMAC &&
                     keyconf->cipher != WLAN_CIPHER_SUITE_BIP_GMAC_128 &&
                     keyconf->cipher != WLAN_CIPHER_SUITE_BIP_GMAC_256)))
                return -EINVAL;

        if (WARN_ON(!iwl_mvm_has_new_rx_api(mvm) &&
                    keyconf->cipher != WLAN_CIPHER_SUITE_AES_CMAC))
                return -EINVAL;

        igtk_cmd.key_id = cpu_to_le32(keyconf->keyidx);
        igtk_cmd.sta_id = cpu_to_le32(sta_id);

        if (remove_key) {
                igtk_cmd.ctrl_flags |= cpu_to_le32(STA_KEY_NOT_VALID);
        } else {
                struct ieee80211_key_seq seq;
                const u8 *pn;

                switch (keyconf->cipher) {
                case WLAN_CIPHER_SUITE_AES_CMAC:
                        igtk_cmd.ctrl_flags |= cpu_to_le32(STA_KEY_FLG_CCM);
                        break;
                case WLAN_CIPHER_SUITE_BIP_GMAC_128:
                case WLAN_CIPHER_SUITE_BIP_GMAC_256:
                        igtk_cmd.ctrl_flags |= cpu_to_le32(STA_KEY_FLG_GCMP);
                        break;
                default:
                        return -EINVAL;
                }

                memcpy(igtk_cmd.igtk, keyconf->key, keyconf->keylen);
                if (keyconf->cipher == WLAN_CIPHER_SUITE_BIP_GMAC_256)
                        igtk_cmd.ctrl_flags |=
                                cpu_to_le32(STA_KEY_FLG_KEY_32BYTES);
                ieee80211_get_key_rx_seq(keyconf, 0, &seq);
                pn = seq.aes_cmac.pn;
                igtk_cmd.receive_seq_cnt = cpu_to_le64(((u64) pn[5] << 0) |
                                                       ((u64) pn[4] << 8) |
                                                       ((u64) pn[3] << 16) |
                                                       ((u64) pn[2] << 24) |
                                                       ((u64) pn[1] << 32) |
                                                       ((u64) pn[0] << 40));
        }

        IWL_DEBUG_INFO(mvm, "%s igtk for sta %u\n",
                       remove_key ? "removing" : "installing",
                       igtk_cmd.sta_id);

        if (!iwl_mvm_has_new_rx_api(mvm)) {
                struct iwl_mvm_mgmt_mcast_key_cmd_v1 igtk_cmd_v1 = {
                        .ctrl_flags = igtk_cmd.ctrl_flags,
                        .key_id = igtk_cmd.key_id,
                        .sta_id = igtk_cmd.sta_id,
                        .receive_seq_cnt = igtk_cmd.receive_seq_cnt
                };

                memcpy(igtk_cmd_v1.igtk, igtk_cmd.igtk,
                       ARRAY_SIZE(igtk_cmd_v1.igtk));
                return iwl_mvm_send_cmd_pdu(mvm, MGMT_MCAST_KEY, 0,
                                            sizeof(igtk_cmd_v1), &igtk_cmd_v1);
        }
        return iwl_mvm_send_cmd_pdu(mvm, MGMT_MCAST_KEY, 0,
                                    sizeof(igtk_cmd), &igtk_cmd);
}


static inline u8 *iwl_mvm_get_mac_addr(struct iwl_mvm *mvm,
                                       struct ieee80211_vif *vif,
                                       struct ieee80211_sta *sta)
{
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);

        if (sta)
                return sta->addr;

        if (vif->type == NL80211_IFTYPE_STATION &&
            mvmvif->ap_sta_id != IWL_MVM_STATION_COUNT) {
                u8 sta_id = mvmvif->ap_sta_id;
                sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[sta_id],
                                                lockdep_is_held(&mvm->mutex));
                return sta->addr;
        }


        return NULL;
}

static int __iwl_mvm_set_sta_key(struct iwl_mvm *mvm,
                                 struct ieee80211_vif *vif,
                                 struct ieee80211_sta *sta,
                                 struct ieee80211_key_conf *keyconf,
                                 u8 key_offset,
                                 bool mcast)
{
        struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
        int ret;
        const u8 *addr;
        struct ieee80211_key_seq seq;
        u16 p1k[5];

        switch (keyconf->cipher) {
        case WLAN_CIPHER_SUITE_TKIP:
                addr = iwl_mvm_get_mac_addr(mvm, vif, sta);
                /* get phase 1 key from mac80211 */
                ieee80211_get_key_rx_seq(keyconf, 0, &seq);
                ieee80211_get_tkip_rx_p1k(keyconf, addr, seq.tkip.iv32, p1k);
                ret = iwl_mvm_send_sta_key(mvm, mvm_sta, keyconf, mcast,
                                           seq.tkip.iv32, p1k, 0, key_offset);
                break;
        case WLAN_CIPHER_SUITE_CCMP:
        case WLAN_CIPHER_SUITE_WEP40:
        case WLAN_CIPHER_SUITE_WEP104:
        case WLAN_CIPHER_SUITE_GCMP:
        case WLAN_CIPHER_SUITE_GCMP_256:
                ret = iwl_mvm_send_sta_key(mvm, mvm_sta, keyconf, mcast,
                                           0, NULL, 0, key_offset);
                break;
        default:
                ret = iwl_mvm_send_sta_key(mvm, mvm_sta, keyconf, mcast,
                                           0, NULL, 0, key_offset);
        }

        return ret;
}

static int __iwl_mvm_remove_sta_key(struct iwl_mvm *mvm, u8 sta_id,
                                    struct ieee80211_key_conf *keyconf,
                                    bool mcast)
{
        struct iwl_mvm_add_sta_key_cmd cmd = {};
        __le16 key_flags;
        int ret;
        u32 status;

        key_flags = cpu_to_le16((keyconf->keyidx << STA_KEY_FLG_KEYID_POS) &
                                 STA_KEY_FLG_KEYID_MSK);
        key_flags |= cpu_to_le16(STA_KEY_FLG_NO_ENC | STA_KEY_FLG_WEP_KEY_MAP);
        key_flags |= cpu_to_le16(STA_KEY_NOT_VALID);

        if (mcast)
                key_flags |= cpu_to_le16(STA_KEY_MULTICAST);

        cmd.key_flags = key_flags;
        cmd.key_offset = keyconf->hw_key_idx;
        cmd.sta_id = sta_id;

        status = ADD_STA_SUCCESS;
        ret = iwl_mvm_send_cmd_pdu_status(mvm, ADD_STA_KEY, sizeof(cmd),
                                          &cmd, &status);

        switch (status) {
        case ADD_STA_SUCCESS:
                IWL_DEBUG_WEP(mvm, "MODIFY_STA: remove sta key passed\n");
                break;
        default:
                ret = -EIO;
                IWL_ERR(mvm, "MODIFY_STA: remove sta key failed\n");
                break;
        }

        return ret;
}

int iwl_mvm_set_sta_key(struct iwl_mvm *mvm,
                        struct ieee80211_vif *vif,
                        struct ieee80211_sta *sta,
                        struct ieee80211_key_conf *keyconf,
                        u8 key_offset)
{
        bool mcast = !(keyconf->flags & IEEE80211_KEY_FLAG_PAIRWISE);
        struct iwl_mvm_sta *mvm_sta;
        u8 sta_id;
        int ret;
        static const u8 __maybe_unused zero_addr[ETH_ALEN] = {0};

        lockdep_assert_held(&mvm->mutex);

        /* Get the station id from the mvm local station table */
        mvm_sta = iwl_mvm_get_key_sta(mvm, vif, sta);
        if (!mvm_sta) {
                IWL_ERR(mvm, "Failed to find station\n");
                return -EINVAL;
        }
        sta_id = mvm_sta->sta_id;

        if (keyconf->cipher == WLAN_CIPHER_SUITE_AES_CMAC ||
            keyconf->cipher == WLAN_CIPHER_SUITE_BIP_GMAC_128 ||
            keyconf->cipher == WLAN_CIPHER_SUITE_BIP_GMAC_256) {
                ret = iwl_mvm_send_sta_igtk(mvm, keyconf, sta_id, false);
                goto end;
        }

        /*
         * It is possible that the 'sta' parameter is NULL, and thus
         * there is a need to retrieve  the sta from the local station table.
         */
        if (!sta) {
                sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[sta_id],
                                                lockdep_is_held(&mvm->mutex));
                if (IS_ERR_OR_NULL(sta)) {
                        IWL_ERR(mvm, "Invalid station id\n");
                        return -EINVAL;
                }
        }

        if (WARN_ON_ONCE(iwl_mvm_sta_from_mac80211(sta)->vif != vif))
                return -EINVAL;

        /* If the key_offset is not pre-assigned, we need to find a
         * new offset to use.  In normal cases, the offset is not
         * pre-assigned, but during HW_RESTART we want to reuse the
         * same indices, so we pass them when this function is called.
         *
         * In D3 entry, we need to hardcoded the indices (because the
         * firmware hardcodes the PTK offset to 0).  In this case, we
         * need to make sure we don't overwrite the hw_key_idx in the
         * keyconf structure, because otherwise we cannot configure
         * the original ones back when resuming.
         */
        if (key_offset == STA_KEY_IDX_INVALID) {
                key_offset  = iwl_mvm_set_fw_key_idx(mvm);
                if (key_offset == STA_KEY_IDX_INVALID)
                        return -ENOSPC;
                keyconf->hw_key_idx = key_offset;
        }

        ret = __iwl_mvm_set_sta_key(mvm, vif, sta, keyconf, key_offset, mcast);
        if (ret)
                goto end;

        /*
         * For WEP, the same key is used for multicast and unicast. Upload it
         * again, using the same key offset, and now pointing the other one
         * to the same key slot (offset).
         * If this fails, remove the original as well.
         */
        if (keyconf->cipher == WLAN_CIPHER_SUITE_WEP40 ||
            keyconf->cipher == WLAN_CIPHER_SUITE_WEP104) {
                ret = __iwl_mvm_set_sta_key(mvm, vif, sta, keyconf,
                                            key_offset, !mcast);
                if (ret) {
                        __iwl_mvm_remove_sta_key(mvm, sta_id, keyconf, mcast);
                        goto end;
                }
        }

        __set_bit(key_offset, mvm->fw_key_table);

end:
        IWL_DEBUG_WEP(mvm, "key: cipher=%x len=%d idx=%d sta=%pM ret=%d\n",
                      keyconf->cipher, keyconf->keylen, keyconf->keyidx,
                      sta ? sta->addr : zero_addr, ret);
        return ret;
}

int iwl_mvm_remove_sta_key(struct iwl_mvm *mvm,
                           struct ieee80211_vif *vif,
                           struct ieee80211_sta *sta,
                           struct ieee80211_key_conf *keyconf)
{
        bool mcast = !(keyconf->flags & IEEE80211_KEY_FLAG_PAIRWISE);
        struct iwl_mvm_sta *mvm_sta;
        u8 sta_id = IWL_MVM_STATION_COUNT;
        int ret, i;

        lockdep_assert_held(&mvm->mutex);

        /* Get the station from the mvm local station table */
        mvm_sta = iwl_mvm_get_key_sta(mvm, vif, sta);

        IWL_DEBUG_WEP(mvm, "mvm remove dynamic key: idx=%d sta=%d\n",
                      keyconf->keyidx, sta_id);

        if (keyconf->cipher == WLAN_CIPHER_SUITE_AES_CMAC ||
            keyconf->cipher == WLAN_CIPHER_SUITE_BIP_GMAC_128 ||
            keyconf->cipher == WLAN_CIPHER_SUITE_BIP_GMAC_256)
                return iwl_mvm_send_sta_igtk(mvm, keyconf, sta_id, true);

        if (!__test_and_clear_bit(keyconf->hw_key_idx, mvm->fw_key_table)) {
                IWL_ERR(mvm, "offset %d not used in fw key table.\n",
                        keyconf->hw_key_idx);
                return -ENOENT;
        }

        /* track which key was deleted last */
        for (i = 0; i < STA_KEY_MAX_NUM; i++) {
                if (mvm->fw_key_deleted[i] < U8_MAX)
                        mvm->fw_key_deleted[i]++;
        }
        mvm->fw_key_deleted[keyconf->hw_key_idx] = 0;

        if (!mvm_sta) {
                IWL_DEBUG_WEP(mvm, "station non-existent, early return.\n");
                return 0;
        }

        sta_id = mvm_sta->sta_id;

        ret = __iwl_mvm_remove_sta_key(mvm, sta_id, keyconf, mcast);
        if (ret)
                return ret;

        /* delete WEP key twice to get rid of (now useless) offset */
        if (keyconf->cipher == WLAN_CIPHER_SUITE_WEP40 ||
            keyconf->cipher == WLAN_CIPHER_SUITE_WEP104)
                ret = __iwl_mvm_remove_sta_key(mvm, sta_id, keyconf, !mcast);

        return ret;
}

void iwl_mvm_update_tkip_key(struct iwl_mvm *mvm,
                             struct ieee80211_vif *vif,
                             struct ieee80211_key_conf *keyconf,
                             struct ieee80211_sta *sta, u32 iv32,
                             u16 *phase1key)
{
        struct iwl_mvm_sta *mvm_sta;
        bool mcast = !(keyconf->flags & IEEE80211_KEY_FLAG_PAIRWISE);

        rcu_read_lock();

        mvm_sta = iwl_mvm_get_key_sta(mvm, vif, sta);
        if (WARN_ON_ONCE(!mvm_sta))
                goto unlock;
        iwl_mvm_send_sta_key(mvm, mvm_sta, keyconf, mcast,
                             iv32, phase1key, CMD_ASYNC, keyconf->hw_key_idx);

 unlock:
        rcu_read_unlock();