/******************************************************************************
 *
 * 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 - 2013 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
 * USA
 *
 * The full GNU General Public License is included in this distribution
 * in the file called COPYING.
 *
 * Contact Information:
 *  Intel Linux Wireless <ilw@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 * BSD LICENSE
 *
 * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
 * 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"

static int iwl_mvm_find_free_sta_id(struct iwl_mvm *mvm)
{
        int sta_id;

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

        lockdep_assert_held(&mvm->mutex);

        /* 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 (!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)
{
        struct iwl_mvm_sta *mvm_sta = (void *)sta->drv_priv;
        struct iwl_mvm_add_sta_cmd add_sta_cmd;
        int ret;
        u32 status;
        u32 agg_size = 0, mpdu_dens = 0;

        memset(&add_sta_cmd, 0, sizeof(add_sta_cmd));

        add_sta_cmd.sta_id = mvm_sta->sta_id;
        add_sta_cmd.mac_id_n_color = cpu_to_le32(mvm_sta->mac_id_n_color);
        if (!update) {
                add_sta_cmd.tfd_queue_msk = cpu_to_le32(mvm_sta->tfd_queue_msk);
                memcpy(&add_sta_cmd.addr, sta->addr, ETH_ALEN);
        }
        add_sta_cmd.add_modify = update ? 1 : 0;

        add_sta_cmd.station_flags_msk |= cpu_to_le32(STA_FLG_FAT_EN_MSK |
                                                     STA_FLG_MIMO_EN_MSK);

        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, sizeof(add_sta_cmd),
                                          &add_sta_cmd, &status);
        if (ret)
                return ret;

        switch (status) {
        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;
}

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 = (void *)sta->drv_priv;
        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);
        else
                sta_id = mvm_sta->sta_id;

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

        spin_lock_init(&mvm_sta->lock);

        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;

        /* HW restart, don't assume the memory has been zeroed */
        atomic_set(&mvm->pending_frames[sta_id], 0);
        mvm_sta->tid_disable_agg = 0;
        mvm_sta->tfd_queue_msk = 0;
        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]);

        if (vif->cab_queue != IEEE80211_INVAL_HW_QUEUE)
                mvm_sta->tfd_queue_msk |= BIT(vif->cab_queue);

        /* for HW restart - need to reset the seq_number etc... */
        memset(mvm_sta->tid_data, 0, sizeof(mvm_sta->tid_data));

        ret = iwl_mvm_sta_send_to_fw(mvm, sta, false);
        if (ret)
                return ret;

        /* The first station added is the AP, the others are TDLS STAs */
        if (vif->type == NL80211_IFTYPE_STATION &&
            mvmvif->ap_sta_id == IWL_MVM_STATION_COUNT)
                mvmvif->ap_sta_id = sta_id;

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

        return 0;
}

int iwl_mvm_update_sta(struct iwl_mvm *mvm,
                       struct ieee80211_vif *vif,
                       struct ieee80211_sta *sta)
{
        return iwl_mvm_sta_send_to_fw(mvm, sta, true);
}

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, sizeof(cmd),
                                          &cmd, &status);
        if (ret)
                return ret;

        switch (status) {
        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, CMD_SYNC,
                                   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 */
                if (!IS_ERR(sta))
                        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_assign_pointer(mvm->fw_id_to_mac_id[sta_id], NULL);
                clear_bit(sta_id, mvm->sta_drained);
        }

        mutex_unlock(&mvm->mutex);
}

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 = (void *)sta->drv_priv;
        int ret;

        lockdep_assert_held(&mvm->mutex);

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

                /*
                 * Put a non-NULL since the fw station isn't removed.
                 * It will be removed after the MAC will be set as
                 * unassoc.
                 */
                rcu_assign_pointer(mvm->fw_id_to_mac_id[mvm_sta->sta_id],
                                   ERR_PTR(-EINVAL));

                /* if we are 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;
        }

        /*
         * 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);
                ret = iwl_mvm_drain_sta(mvm, mvm_sta, true);
        } else {
                spin_unlock_bh(&mvm_sta->lock);
                ret = iwl_mvm_rm_sta_common(mvm, mvm_sta->sta_id);
                rcu_assign_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_assign_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)
{
        if (!test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status)) {
                sta->sta_id = iwl_mvm_find_free_sta_id(mvm);
                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;
}

void iwl_mvm_dealloc_int_sta(struct iwl_mvm *mvm, struct iwl_mvm_int_sta *sta)
{
        rcu_assign_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(struct iwl_mvm_add_sta_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);

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

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

        switch (status) {
        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)
{
        int ret;

        lockdep_assert_held(&mvm->mutex);

        /* Add the aux station, but without any queues */
        ret = iwl_mvm_allocate_int_sta(mvm, &mvm->aux_sta, 0);
        if (ret)
                return ret;

        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;
}

/*
 * 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_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
                           struct iwl_mvm_int_sta *bsta)
{
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
        static const u8 baddr[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};

        lockdep_assert_held(&mvm->mutex);

        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 iwl_mvm_int_sta *bsta)
{
        int ret;

        lockdep_assert_held(&mvm->mutex);

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

/* 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_int_sta *bsta)
{
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
        static const u8 baddr[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
        u32 qmask;
        int ret;

        lockdep_assert_held(&mvm->mutex);

        qmask = iwl_mvm_mac_get_queues_mask(mvm, vif);
        ret = iwl_mvm_allocate_int_sta(mvm, bsta, qmask);
        if (ret)
                return ret;

        ret = iwl_mvm_add_int_sta_common(mvm, bsta, baddr,
                                         mvmvif->id, mvmvif->color);

        if (ret)
                iwl_mvm_dealloc_int_sta(mvm, bsta);
        return ret;
}

/*
 * 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 iwl_mvm_int_sta *bsta)
{
        int ret;

        lockdep_assert_held(&mvm->mutex);

        ret = iwl_mvm_rm_sta_common(mvm, bsta->sta_id);
        if (ret)
                return ret;

        iwl_mvm_dealloc_int_sta(mvm, bsta);
        return ret;
}

int iwl_mvm_sta_rx_agg(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
                       int tid, u16 ssn, bool start)
{
        struct iwl_mvm_sta *mvm_sta = (void *)sta->drv_priv;
        struct iwl_mvm_add_sta_cmd cmd = {};
        int ret;
        u32 status;

        lockdep_assert_held(&mvm->mutex);

        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.add_immediate_ba_tid = (u8) tid;
        cmd.add_immediate_ba_ssn = cpu_to_le16(ssn);
        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, sizeof(cmd),
                                          &cmd, &status);
        if (ret)
                return ret;

        switch (status) {
        case ADD_STA_SUCCESS:
                IWL_DEBUG_INFO(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;
        }

        return ret;
}

static 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 = (void *)sta->drv_priv;
        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 {
                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, sizeof(cmd),
                                          &cmd, &status);
        if (ret)
                return ret;

        switch (status) {
        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;
}

static const u8 tid_to_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,
};

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 = (void *)sta->drv_priv;
        struct iwl_mvm_tid_data *tid_data;
        int txq_id;

        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);

        for (txq_id = IWL_MVM_FIRST_AGG_QUEUE;
             txq_id <= IWL_MVM_LAST_AGG_QUEUE; txq_id++)
                if (mvm->queue_to_mac80211[txq_id] ==
                    IWL_INVALID_MAC80211_QUEUE)
                        break;

        if (txq_id > IWL_MVM_LAST_AGG_QUEUE) {
                IWL_ERR(mvm, "Failed to allocate agg queue\n");
                return -EIO;
        }

        /* the new tx queue is still connected to the same mac80211 queue */
        mvm->queue_to_mac80211[txq_id] = vif->hw_queue[tid_to_ac[tid]];

        spin_lock_bh(&mvmsta->lock);
        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;
        }

        spin_unlock_bh(&mvmsta->lock);

        return 0;
}

int iwl_mvm_sta_tx_agg_oper(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
                            struct ieee80211_sta *sta, u16 tid, u8 buf_size)
{
        struct iwl_mvm_sta *mvmsta = (void *)sta->drv_priv;
        struct iwl_mvm_tid_data *tid_data = &mvmsta->tid_data[tid];
        int queue, fifo, ret;
        u16 ssn;

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

        fifo = iwl_mvm_ac_to_tx_fifo[tid_to_ac[tid]];

        ret = iwl_mvm_sta_tx_agg(mvm, sta, tid, queue, true);
        if (ret)
                return -EIO;

        iwl_trans_txq_enable(mvm->trans, queue, fifo, mvmsta->sta_id, tid,
                             buf_size, ssn);

        /*
         * 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;

        if (mvm->cfg->ht_params->use_rts_for_aggregation) {
                /*
                 * switch to RTS/CTS if it is the prefer protection
                 * method for HT traffic
                 */
                mvmsta->lq_sta.lq.flags |= LQ_FLAG_SET_STA_TLC_RTS_MSK;
                /*
                 * TODO: remove the TLC_RTS flag when we tear down the last
                 * AGG session (agg_tids_count in DVM)
                 */
        }

        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, CMD_ASYNC, 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 = (void *)sta->drv_priv;
        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);

        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;
                iwl_trans_txq_disable(mvm->trans, txq_id);
                /* fall through */
        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);
                mvm->queue_to_mac80211[txq_id] = IWL_INVALID_MAC80211_QUEUE;

                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 = (void *)sta->drv_priv;
        struct iwl_mvm_tid_data *tid_data = &mvmsta->tid_data[tid];
        u16 txq_id;

        /*
         * 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);
        tid_data->state = IWL_AGG_OFF;
        spin_unlock_bh(&mvmsta->lock);

        if (iwl_mvm_flush_tx_path(mvm, BIT(txq_id), true))
                IWL_ERR(mvm, "Couldn't flush the AGG queue\n");

        iwl_trans_txq_disable(mvm->trans, tid_data->txq_id);
        mvm->queue_to_mac80211[tid_data->txq_id] =
                                IWL_INVALID_MAC80211_QUEUE;

        return 0;
}

static int iwl_mvm_set_fw_key_idx(struct iwl_mvm *mvm)
{
        int i;

        lockdep_assert_held(&mvm->mutex);

        i = find_first_zero_bit(mvm->fw_key_table, STA_KEY_MAX_NUM);

        if (i == STA_KEY_MAX_NUM)
                return STA_KEY_IDX_INVALID;

        __set_bit(i, mvm->fw_key_table);

        return i;
}

static u8 iwl_mvm_get_key_sta_id(struct ieee80211_vif *vif,
                                 struct ieee80211_sta *sta)
{
        struct iwl_mvm_vif *mvmvif = (void *)vif->drv_priv;

        if (sta) {
                struct iwl_mvm_sta *mvm_sta = (void *)sta->drv_priv;

                return mvm_sta->sta_id;
        }

        /*
         * 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)
                return mvmvif->ap_sta_id;

        return IWL_MVM_STATION_COUNT;
}

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

        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.key.tkip_rx_tsc_byte2 = tkip_iv32;
                for (i = 0; i < 5; i++)
                        cmd.key.tkip_rx_ttak[i] = cpu_to_le16(tkip_p1k[i]);
                memcpy(cmd.key.key, keyconf->key, keyconf->keylen);
                break;
        case WLAN_CIPHER_SUITE_CCMP:
                key_flags |= cpu_to_le16(STA_KEY_FLG_CCM);
                memcpy(cmd.key.key, keyconf->key, keyconf->keylen);
                break;
        default:
                WARN_ON(1);
                return -EINVAL;
        }

        if (!(keyconf->flags & IEEE80211_KEY_FLAG_PAIRWISE))
                key_flags |= cpu_to_le16(STA_KEY_MULTICAST);

        cmd.mac_id_n_color = cpu_to_le32(mvm_sta->mac_id_n_color);
        cmd.key.key_offset = keyconf->hw_key_idx;
        cmd.key.key_flags = key_flags;
        cmd.add_modify = STA_MODE_MODIFY;
        cmd.modify_mask = STA_MODIFY_KEY;
        cmd.sta_id = sta_id;

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

        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->cipher != WLAN_CIPHER_SUITE_AES_CMAC) ||
                    (keyconf->flags & IEEE80211_KEY_FLAG_PAIRWISE) ||
                    (keyconf->keyidx != 4 && keyconf->keyidx != 5)))
                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;

                memcpy(igtk_cmd.IGTK, keyconf->key, keyconf->keylen);
                ieee80211_aes_cmac_calculate_k1_k2(keyconf,
                                                   igtk_cmd.K1, igtk_cmd.K2);
                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);

        return iwl_mvm_send_cmd_pdu(mvm, MGMT_MCAST_KEY, CMD_SYNC,
                                    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 = (void *)vif->drv_priv;

        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;
}

int iwl_mvm_set_sta_key(struct iwl_mvm *mvm,
                        struct ieee80211_vif *vif,
                        struct ieee80211_sta *sta,
                        struct ieee80211_key_conf *keyconf,
                        bool have_key_offset)
{
        struct iwl_mvm_sta *mvm_sta;
        int ret;
        u8 *addr, sta_id;
        struct ieee80211_key_seq seq;
        u16 p1k[5];

        lockdep_assert_held(&mvm->mutex);

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

        if (keyconf->cipher == WLAN_CIPHER_SUITE_AES_CMAC) {
                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;
                }
        }

        mvm_sta = (struct iwl_mvm_sta *)sta->drv_priv;
        if (WARN_ON_ONCE(mvm_sta->vif != vif))
                return -EINVAL;

        if (!have_key_offset) {
                /*
                 * The D3 firmware hardcodes the PTK offset to 0, so we have to
                 * configure it there. As a result, this workaround exists to
                 * let the caller set the key offset (hw_key_idx), see d3.c.
                 */
                keyconf->hw_key_idx = iwl_mvm_set_fw_key_idx(mvm);
                if (keyconf->hw_key_idx == STA_KEY_IDX_INVALID)
                        return -ENOSPC;
        }

        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, sta_id,
                                           seq.tkip.iv32, p1k, CMD_SYNC);
                break;
        case WLAN_CIPHER_SUITE_CCMP:
                ret = iwl_mvm_send_sta_key(mvm, mvm_sta, keyconf, sta_id,
                                           0, NULL, CMD_SYNC);
                break;
        default:
                IWL_ERR(mvm, "Unknown cipher %x\n", keyconf->cipher);
                ret = -EINVAL;
        }

        if (ret)
                __clear_bit(keyconf->hw_key_idx, 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->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)
{
        struct iwl_mvm_sta *mvm_sta;
        struct iwl_mvm_add_sta_cmd cmd = {};
        __le16 key_flags;
        int ret, status;
        u8 sta_id;

        lockdep_assert_held(&mvm->mutex);

        /* Get the station id from the mvm local station table */
        sta_id = iwl_mvm_get_key_sta_id(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)
                return iwl_mvm_send_sta_igtk(mvm, keyconf, sta_id, true);

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

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

        /*
         * It is possible that the 'sta' parameter is NULL, and thus
         * there is a need to retrieve the sta from the local station table,
         * for example when a GTK is removed (where the sta_id will then be
         * the AP ID, and no station was passed by mac80211.)
         */
        if (!sta) {
                sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[sta_id],
                                                lockdep_is_held(&mvm->mutex));
                if (!sta) {
                        IWL_ERR(mvm, "Invalid station id\n");
                        return -EINVAL;
                }
        }

        mvm_sta = (struct iwl_mvm_sta *)sta->drv_priv;
        if (WARN_ON_ONCE(mvm_sta->vif != vif))
                return -EINVAL;

        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 (!(keyconf->flags & IEEE80211_KEY_FLAG_PAIRWISE))
                key_flags |= cpu_to_le16(STA_KEY_MULTICAST);

        cmd.mac_id_n_color = cpu_to_le32(mvm_sta->mac_id_n_color);
        cmd.key.key_flags = key_flags;
        cmd.key.key_offset = keyconf->hw_key_idx;
        cmd.sta_id = sta_id;

        cmd.modify_mask = STA_MODIFY_KEY;
        cmd.add_modify = STA_MODE_MODIFY;

        status = ADD_STA_SUCCESS;
        ret = iwl_mvm_send_cmd_pdu_status(mvm, ADD_STA, 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;
}

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;
        u8 sta_id = iwl_mvm_get_key_sta_id(vif, sta);

        if (WARN_ON_ONCE(sta_id == IWL_MVM_STATION_COUNT))
                return;

        rcu_read_lock();

        if (!sta) {
                sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
                if (WARN_ON(IS_ERR_OR_NULL(sta))) {
                        rcu_read_unlock();
                        return;
                }
        }

        mvm_sta = (void *)sta->drv_priv;
        iwl_mvm_send_sta_key(mvm, mvm_sta, keyconf, sta_id,
                             iv32, phase1key, CMD_ASYNC);
        rcu_read_unlock();
}

void iwl_mvm_sta_modify_ps_wake(struct iwl_mvm *mvm,
                                struct ieee80211_sta *sta)
{
        struct iwl_mvm_sta *mvmsta = (void *)sta->drv_priv;
        struct iwl_mvm_add_sta_cmd cmd = {
                .add_modify = STA_MODE_MODIFY,
                .sta_id = mvmsta->sta_id,
                .modify_mask = STA_MODIFY_SLEEPING_STA_TX_COUNT,
                .sleep_state_flags = cpu_to_le16(STA_SLEEP_STATE_AWAKE),
                .mac_id_n_color = cpu_to_le32(mvmsta->mac_id_n_color),
        };
        int ret;

        /*
         * Same modify mask for sleep_tx_count and sleep_state_flags but this
         * should be fine since if we set the STA as "awake", then
         * sleep_tx_count is not relevant.
         */
        ret = iwl_mvm_send_cmd_pdu(mvm, ADD_STA, CMD_ASYNC, sizeof(cmd), &cmd);
        if (ret)
                IWL_ERR(mvm, "Failed to send ADD_STA command (%d)\n", ret);
}

void iwl_mvm_sta_modify_sleep_tx_count(struct iwl_mvm *mvm,
                                       struct ieee80211_sta *sta,
                                       enum ieee80211_frame_release_type reason,
                                       u16 cnt)
{
        u16 sleep_state_flags =
                (reason == IEEE80211_FRAME_RELEASE_UAPSD) ?
                        STA_SLEEP_STATE_UAPSD : STA_SLEEP_STATE_PS_POLL;
        struct iwl_mvm_sta *mvmsta = (void *)sta->drv_priv;
        struct iwl_mvm_add_sta_cmd cmd = {
                .add_modify = STA_MODE_MODIFY,
                .sta_id = mvmsta->sta_id,
                .modify_mask = STA_MODIFY_SLEEPING_STA_TX_COUNT,
                .sleep_tx_count = cpu_to_le16(cnt),
                .mac_id_n_color = cpu_to_le32(mvmsta->mac_id_n_color),
                /*
                 * Same modify mask for sleep_tx_count and sleep_state_flags so
                 * we must set the sleep_state_flags too.
                 */
                .sleep_state_flags = cpu_to_le16(sleep_state_flags),
        };
        int ret;

        /* TODO: somehow the fw doesn't seem to take PS_POLL into account */
        ret = iwl_mvm_send_cmd_pdu(mvm, ADD_STA, CMD_ASYNC, sizeof(cmd), &cmd);
        if (ret)
                IWL_ERR(mvm, "Failed to send ADD_STA command (%d)\n", ret);
}