/******************************************************************************
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
 * Copyright(c) 2016 - 2017 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 - 2014 Intel Corporation. All rights reserved.
 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
 * Copyright(c) 2016 - 2017 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 <linux/kernel.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ip.h>
#include <linux/if_arp.h>
#include <linux/time.h>
#include <net/mac80211.h>
#include <net/ieee80211_radiotap.h>
#include <net/tcp.h>

#include "iwl-op-mode.h"
#include "iwl-io.h"
#include "mvm.h"
#include "sta.h"
#include "time-event.h"
#include "iwl-eeprom-parse.h"
#include "iwl-phy-db.h"
#include "testmode.h"
#include "fw/error-dump.h"
#include "iwl-prph.h"
#include "iwl-nvm-parse.h"

static const struct ieee80211_iface_limit iwl_mvm_limits[] = {
        {
                .max = 1,
                .types = BIT(NL80211_IFTYPE_STATION),
        },
        {
                .max = 1,
                .types = BIT(NL80211_IFTYPE_AP) |
                        BIT(NL80211_IFTYPE_P2P_CLIENT) |
                        BIT(NL80211_IFTYPE_P2P_GO),
        },
        {
                .max = 1,
                .types = BIT(NL80211_IFTYPE_P2P_DEVICE),
        },
};

static const struct ieee80211_iface_combination iwl_mvm_iface_combinations[] = {
        {
                .num_different_channels = 2,
                .max_interfaces = 3,
                .limits = iwl_mvm_limits,
                .n_limits = ARRAY_SIZE(iwl_mvm_limits),
        },
};

#ifdef CONFIG_PM_SLEEP
static const struct nl80211_wowlan_tcp_data_token_feature
iwl_mvm_wowlan_tcp_token_feature = {
        .min_len = 0,
        .max_len = 255,
        .bufsize = IWL_WOWLAN_REMOTE_WAKE_MAX_TOKENS,
};

static const struct wiphy_wowlan_tcp_support iwl_mvm_wowlan_tcp_support = {
        .tok = &iwl_mvm_wowlan_tcp_token_feature,
        .data_payload_max = IWL_WOWLAN_TCP_MAX_PACKET_LEN -
                            sizeof(struct ethhdr) -
                            sizeof(struct iphdr) -
                            sizeof(struct tcphdr),
        .data_interval_max = 65535, /* __le16 in API */
        .wake_payload_max = IWL_WOWLAN_REMOTE_WAKE_MAX_PACKET_LEN -
                            sizeof(struct ethhdr) -
                            sizeof(struct iphdr) -
                            sizeof(struct tcphdr),
        .seq = true,
};
#endif

#ifdef CONFIG_IWLWIFI_BCAST_FILTERING
/*
 * Use the reserved field to indicate magic values.
 * these values will only be used internally by the driver,
 * and won't make it to the fw (reserved will be 0).
 * BC_FILTER_MAGIC_IP - configure the val of this attribute to
 *      be the vif's ip address. in case there is not a single
 *      ip address (0, or more than 1), this attribute will
 *      be skipped.
 * BC_FILTER_MAGIC_MAC - set the val of this attribute to
 *      the LSB bytes of the vif's mac address
 */
enum {
        BC_FILTER_MAGIC_NONE = 0,
        BC_FILTER_MAGIC_IP,
        BC_FILTER_MAGIC_MAC,
};

static const struct iwl_fw_bcast_filter iwl_mvm_default_bcast_filters[] = {
        {
                /* arp */
                .discard = 0,
                .frame_type = BCAST_FILTER_FRAME_TYPE_ALL,
                .attrs = {
                        {
                                /* frame type - arp, hw type - ethernet */
                                .offset_type =
                                        BCAST_FILTER_OFFSET_PAYLOAD_START,
                                .offset = sizeof(rfc1042_header),
                                .val = cpu_to_be32(0x08060001),
                                .mask = cpu_to_be32(0xffffffff),
                        },
                        {
                                /* arp dest ip */
                                .offset_type =
                                        BCAST_FILTER_OFFSET_PAYLOAD_START,
                                .offset = sizeof(rfc1042_header) + 2 +
                                          sizeof(struct arphdr) +
                                          ETH_ALEN + sizeof(__be32) +
                                          ETH_ALEN,
                                .mask = cpu_to_be32(0xffffffff),
                                /* mark it as special field */
                                .reserved1 = cpu_to_le16(BC_FILTER_MAGIC_IP),
                        },
                },
        },
        {
                /* dhcp offer bcast */
                .discard = 0,
                .frame_type = BCAST_FILTER_FRAME_TYPE_IPV4,
                .attrs = {
                        {
                                /* udp dest port - 68 (bootp client)*/
                                .offset_type = BCAST_FILTER_OFFSET_IP_END,
                                .offset = offsetof(struct udphdr, dest),
                                .val = cpu_to_be32(0x00440000),
                                .mask = cpu_to_be32(0xffff0000),
                        },
                        {
                                /* dhcp - lsb bytes of client hw address */
                                .offset_type = BCAST_FILTER_OFFSET_IP_END,
                                .offset = 38,
                                .mask = cpu_to_be32(0xffffffff),
                                /* mark it as special field */
                                .reserved1 = cpu_to_le16(BC_FILTER_MAGIC_MAC),
                        },
                },
        },
        /* last filter must be empty */
        {},
};
#endif

void iwl_mvm_ref(struct iwl_mvm *mvm, enum iwl_mvm_ref_type ref_type)
{
        if (!iwl_mvm_is_d0i3_supported(mvm))
                return;

        IWL_DEBUG_RPM(mvm, "Take mvm reference - type %d\n", ref_type);
        spin_lock_bh(&mvm->refs_lock);
        mvm->refs[ref_type]++;
        spin_unlock_bh(&mvm->refs_lock);
        iwl_trans_ref(mvm->trans);
}

void iwl_mvm_unref(struct iwl_mvm *mvm, enum iwl_mvm_ref_type ref_type)
{
        if (!iwl_mvm_is_d0i3_supported(mvm))
                return;

        IWL_DEBUG_RPM(mvm, "Leave mvm reference - type %d\n", ref_type);
        spin_lock_bh(&mvm->refs_lock);
        if (WARN_ON(!mvm->refs[ref_type])) {
                spin_unlock_bh(&mvm->refs_lock);
                return;
        }
        mvm->refs[ref_type]--;
        spin_unlock_bh(&mvm->refs_lock);
        iwl_trans_unref(mvm->trans);
}

static void iwl_mvm_unref_all_except(struct iwl_mvm *mvm,
                                     enum iwl_mvm_ref_type except_ref)
{
        int i, j;

        if (!iwl_mvm_is_d0i3_supported(mvm))
                return;

        spin_lock_bh(&mvm->refs_lock);
        for (i = 0; i < IWL_MVM_REF_COUNT; i++) {
                if (except_ref == i || !mvm->refs[i])
                        continue;

                IWL_DEBUG_RPM(mvm, "Cleanup: remove mvm ref type %d (%d)\n",
                              i, mvm->refs[i]);
                for (j = 0; j < mvm->refs[i]; j++)
                        iwl_trans_unref(mvm->trans);
                mvm->refs[i] = 0;
        }
        spin_unlock_bh(&mvm->refs_lock);
}

bool iwl_mvm_ref_taken(struct iwl_mvm *mvm)
{
        int i;
        bool taken = false;

        if (!iwl_mvm_is_d0i3_supported(mvm))
                return true;

        spin_lock_bh(&mvm->refs_lock);
        for (i = 0; i < IWL_MVM_REF_COUNT; i++) {
                if (mvm->refs[i]) {
                        taken = true;
                        break;
                }
        }
        spin_unlock_bh(&mvm->refs_lock);

        return taken;
}

int iwl_mvm_ref_sync(struct iwl_mvm *mvm, enum iwl_mvm_ref_type ref_type)
{
        iwl_mvm_ref(mvm, ref_type);

        if (!wait_event_timeout(mvm->d0i3_exit_waitq,
                                !test_bit(IWL_MVM_STATUS_IN_D0I3, &mvm->status),
                                HZ)) {
                WARN_ON_ONCE(1);
                iwl_mvm_unref(mvm, ref_type);
                return -EIO;
        }

        return 0;
}

static void iwl_mvm_reset_phy_ctxts(struct iwl_mvm *mvm)
{
        int i;

        memset(mvm->phy_ctxts, 0, sizeof(mvm->phy_ctxts));
        for (i = 0; i < NUM_PHY_CTX; i++) {
                mvm->phy_ctxts[i].id = i;
                mvm->phy_ctxts[i].ref = 0;
        }
}

struct ieee80211_regdomain *iwl_mvm_get_regdomain(struct wiphy *wiphy,
                                                  const char *alpha2,
                                                  enum iwl_mcc_source src_id,
                                                  bool *changed)
{
        struct ieee80211_regdomain *regd = NULL;
        struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
        struct iwl_mcc_update_resp *resp;

        IWL_DEBUG_LAR(mvm, "Getting regdomain data for %s from FW\n", alpha2);

        lockdep_assert_held(&mvm->mutex);

        resp = iwl_mvm_update_mcc(mvm, alpha2, src_id);
        if (IS_ERR_OR_NULL(resp)) {
                IWL_DEBUG_LAR(mvm, "Could not get update from FW %d\n",
                              PTR_ERR_OR_ZERO(resp));
                goto out;
        }

        if (changed)
                *changed = (resp->status == MCC_RESP_NEW_CHAN_PROFILE);

        regd = iwl_parse_nvm_mcc_info(mvm->trans->dev, mvm->cfg,
                                      __le32_to_cpu(resp->n_channels),
                                      resp->channels,
                                      __le16_to_cpu(resp->mcc),
                                      __le16_to_cpu(resp->geo_info));
        /* Store the return source id */
        src_id = resp->source_id;
        kfree(resp);
        if (IS_ERR_OR_NULL(regd)) {
                IWL_DEBUG_LAR(mvm, "Could not get parse update from FW %d\n",
                              PTR_ERR_OR_ZERO(regd));
                goto out;
        }

        IWL_DEBUG_LAR(mvm, "setting alpha2 from FW to %s (0x%x, 0x%x) src=%d\n",
                      regd->alpha2, regd->alpha2[0], regd->alpha2[1], src_id);
        mvm->lar_regdom_set = true;
        mvm->mcc_src = src_id;

out:
        return regd;
}

void iwl_mvm_update_changed_regdom(struct iwl_mvm *mvm)
{
        bool changed;
        struct ieee80211_regdomain *regd;

        if (!iwl_mvm_is_lar_supported(mvm))
                return;

        regd = iwl_mvm_get_current_regdomain(mvm, &changed);
        if (!IS_ERR_OR_NULL(regd)) {
                /* only update the regulatory core if changed */
                if (changed)
                        regulatory_set_wiphy_regd(mvm->hw->wiphy, regd);

                kfree(regd);
        }
}

struct ieee80211_regdomain *iwl_mvm_get_current_regdomain(struct iwl_mvm *mvm,
                                                          bool *changed)
{
        return iwl_mvm_get_regdomain(mvm->hw->wiphy, "ZZ",
                                     iwl_mvm_is_wifi_mcc_supported(mvm) ?
                                     MCC_SOURCE_GET_CURRENT :
                                     MCC_SOURCE_OLD_FW, changed);
}

int iwl_mvm_init_fw_regd(struct iwl_mvm *mvm)
{
        enum iwl_mcc_source used_src;
        struct ieee80211_regdomain *regd;
        int ret;
        bool changed;
        const struct ieee80211_regdomain *r =
                        rtnl_dereference(mvm->hw->wiphy->regd);

        if (!r)
                return -ENOENT;

        /* save the last source in case we overwrite it below */
        used_src = mvm->mcc_src;
        if (iwl_mvm_is_wifi_mcc_supported(mvm)) {
                /* Notify the firmware we support wifi location updates */
                regd = iwl_mvm_get_current_regdomain(mvm, NULL);
                if (!IS_ERR_OR_NULL(regd))
                        kfree(regd);
        }

        /* Now set our last stored MCC and source */
        regd = iwl_mvm_get_regdomain(mvm->hw->wiphy, r->alpha2, used_src,
                                     &changed);
        if (IS_ERR_OR_NULL(regd))
                return -EIO;

        /* update cfg80211 if the regdomain was changed */
        if (changed)
                ret = regulatory_set_wiphy_regd_sync_rtnl(mvm->hw->wiphy, regd);
        else
                ret = 0;

        kfree(regd);
        return ret;
}

int iwl_mvm_mac_setup_register(struct iwl_mvm *mvm)
{
        struct ieee80211_hw *hw = mvm->hw;
        int num_mac, ret, i;
        static const u32 mvm_ciphers[] = {
                WLAN_CIPHER_SUITE_WEP40,
                WLAN_CIPHER_SUITE_WEP104,
                WLAN_CIPHER_SUITE_TKIP,
                WLAN_CIPHER_SUITE_CCMP,
        };

        /* Tell mac80211 our characteristics */
        ieee80211_hw_set(hw, SIGNAL_DBM);
        ieee80211_hw_set(hw, SPECTRUM_MGMT);
        ieee80211_hw_set(hw, REPORTS_TX_ACK_STATUS);
        ieee80211_hw_set(hw, QUEUE_CONTROL);
        ieee80211_hw_set(hw, WANT_MONITOR_VIF);
        ieee80211_hw_set(hw, SUPPORTS_PS);
        ieee80211_hw_set(hw, SUPPORTS_DYNAMIC_PS);
        ieee80211_hw_set(hw, AMPDU_AGGREGATION);
        ieee80211_hw_set(hw, TIMING_BEACON_ONLY);
        ieee80211_hw_set(hw, CONNECTION_MONITOR);
        ieee80211_hw_set(hw, CHANCTX_STA_CSA);
        ieee80211_hw_set(hw, SUPPORT_FAST_XMIT);
        ieee80211_hw_set(hw, SUPPORTS_CLONED_SKBS);
        ieee80211_hw_set(hw, SUPPORTS_AMSDU_IN_AMPDU);
        ieee80211_hw_set(hw, NEEDS_UNIQUE_STA_ADDR);
        if (iwl_mvm_has_new_rx_api(mvm))
                ieee80211_hw_set(hw, SUPPORTS_REORDERING_BUFFER);

        if (fw_has_capa(&mvm->fw->ucode_capa,
                        IWL_UCODE_TLV_CAPA_STA_PM_NOTIF)) {
                ieee80211_hw_set(hw, AP_LINK_PS);
        } else if (WARN_ON(iwl_mvm_has_new_tx_api(mvm))) {
                /*
                 * we absolutely need this for the new TX API since that comes
                 * with many more queues than the current code can deal with
                 * for station powersave
                 */
                return -EINVAL;
        }

        if (mvm->trans->num_rx_queues > 1)
                ieee80211_hw_set(hw, USES_RSS);

        if (mvm->trans->max_skb_frags)
                hw->netdev_features = NETIF_F_HIGHDMA | NETIF_F_SG;

        hw->queues = IEEE80211_MAX_QUEUES;
        hw->offchannel_tx_hw_queue = IWL_MVM_OFFCHANNEL_QUEUE;
        hw->radiotap_mcs_details |= IEEE80211_RADIOTAP_MCS_HAVE_FEC |
                                    IEEE80211_RADIOTAP_MCS_HAVE_STBC;
        hw->radiotap_vht_details |= IEEE80211_RADIOTAP_VHT_KNOWN_STBC |
                IEEE80211_RADIOTAP_VHT_KNOWN_BEAMFORMED;

        hw->radiotap_timestamp.units_pos =
                IEEE80211_RADIOTAP_TIMESTAMP_UNIT_US |
                IEEE80211_RADIOTAP_TIMESTAMP_SPOS_PLCP_SIG_ACQ;
        /* this is the case for CCK frames, it's better (only 8) for OFDM */
        hw->radiotap_timestamp.accuracy = 22;

        hw->rate_control_algorithm = "iwl-mvm-rs";
        hw->uapsd_queues = IWL_MVM_UAPSD_QUEUES;
        hw->uapsd_max_sp_len = IWL_UAPSD_MAX_SP;

        BUILD_BUG_ON(ARRAY_SIZE(mvm->ciphers) < ARRAY_SIZE(mvm_ciphers) + 6);
        memcpy(mvm->ciphers, mvm_ciphers, sizeof(mvm_ciphers));
        hw->wiphy->n_cipher_suites = ARRAY_SIZE(mvm_ciphers);
        hw->wiphy->cipher_suites = mvm->ciphers;

        if (iwl_mvm_has_new_rx_api(mvm)) {
                mvm->ciphers[hw->wiphy->n_cipher_suites] =
                        WLAN_CIPHER_SUITE_GCMP;
                hw->wiphy->n_cipher_suites++;
                mvm->ciphers[hw->wiphy->n_cipher_suites] =
                        WLAN_CIPHER_SUITE_GCMP_256;
                hw->wiphy->n_cipher_suites++;
        }

        /* Enable 11w if software crypto is not enabled (as the
         * firmware will interpret some mgmt packets, so enabling it
         * with software crypto isn't safe).
         */
        if (!iwlwifi_mod_params.swcrypto) {
                ieee80211_hw_set(hw, MFP_CAPABLE);
                mvm->ciphers[hw->wiphy->n_cipher_suites] =
                        WLAN_CIPHER_SUITE_AES_CMAC;
                hw->wiphy->n_cipher_suites++;
                if (iwl_mvm_has_new_rx_api(mvm)) {
                        mvm->ciphers[hw->wiphy->n_cipher_suites] =
                                WLAN_CIPHER_SUITE_BIP_GMAC_128;
                        hw->wiphy->n_cipher_suites++;
                        mvm->ciphers[hw->wiphy->n_cipher_suites] =
                                WLAN_CIPHER_SUITE_BIP_GMAC_256;
                        hw->wiphy->n_cipher_suites++;
                }
        }

        /* currently FW API supports only one optional cipher scheme */
        if (mvm->fw->cs[0].cipher) {
                const struct iwl_fw_cipher_scheme *fwcs = &mvm->fw->cs[0];
                struct ieee80211_cipher_scheme *cs = &mvm->cs[0];

                mvm->hw->n_cipher_schemes = 1;

                cs->cipher = le32_to_cpu(fwcs->cipher);
                cs->iftype = BIT(NL80211_IFTYPE_STATION);
                cs->hdr_len = fwcs->hdr_len;
                cs->pn_len = fwcs->pn_len;
                cs->pn_off = fwcs->pn_off;
                cs->key_idx_off = fwcs->key_idx_off;
                cs->key_idx_mask = fwcs->key_idx_mask;
                cs->key_idx_shift = fwcs->key_idx_shift;
                cs->mic_len = fwcs->mic_len;

                mvm->hw->cipher_schemes = mvm->cs;
                mvm->ciphers[hw->wiphy->n_cipher_suites] = cs->cipher;
                hw->wiphy->n_cipher_suites++;
        }

        ieee80211_hw_set(hw, SINGLE_SCAN_ON_ALL_BANDS);
        hw->wiphy->features |=
                NL80211_FEATURE_SCHED_SCAN_RANDOM_MAC_ADDR |
                NL80211_FEATURE_SCAN_RANDOM_MAC_ADDR |
                NL80211_FEATURE_ND_RANDOM_MAC_ADDR;

        hw->sta_data_size = sizeof(struct iwl_mvm_sta);
        hw->vif_data_size = sizeof(struct iwl_mvm_vif);
        hw->chanctx_data_size = sizeof(u16);

        hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION) |
                BIT(NL80211_IFTYPE_P2P_CLIENT) |
                BIT(NL80211_IFTYPE_AP) |
                BIT(NL80211_IFTYPE_P2P_GO) |
                BIT(NL80211_IFTYPE_P2P_DEVICE) |
                BIT(NL80211_IFTYPE_ADHOC);

        hw->wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
        hw->wiphy->regulatory_flags |= REGULATORY_ENABLE_RELAX_NO_IR;
        if (iwl_mvm_is_lar_supported(mvm))
                hw->wiphy->regulatory_flags |= REGULATORY_WIPHY_SELF_MANAGED;
        else
                hw->wiphy->regulatory_flags |= REGULATORY_CUSTOM_REG |
                                               REGULATORY_DISABLE_BEACON_HINTS;

        hw->wiphy->flags |= WIPHY_FLAG_AP_UAPSD;
        hw->wiphy->flags |= WIPHY_FLAG_HAS_CHANNEL_SWITCH;

        hw->wiphy->iface_combinations = iwl_mvm_iface_combinations;
        hw->wiphy->n_iface_combinations =
                ARRAY_SIZE(iwl_mvm_iface_combinations);

        hw->wiphy->max_remain_on_channel_duration = 10000;
        hw->max_listen_interval = IWL_CONN_MAX_LISTEN_INTERVAL;
        /* we can compensate an offset of up to 3 channels = 15 MHz */
        hw->wiphy->max_adj_channel_rssi_comp = 3 * 5;

        /* Extract MAC address */
        memcpy(mvm->addresses[0].addr, mvm->nvm_data->hw_addr, ETH_ALEN);
        hw->wiphy->addresses = mvm->addresses;
        hw->wiphy->n_addresses = 1;

        /* Extract additional MAC addresses if available */
        num_mac = (mvm->nvm_data->n_hw_addrs > 1) ?
                min(IWL_MVM_MAX_ADDRESSES, mvm->nvm_data->n_hw_addrs) : 1;

        for (i = 1; i < num_mac; i++) {
                memcpy(mvm->addresses[i].addr, mvm->addresses[i-1].addr,
                       ETH_ALEN);
                mvm->addresses[i].addr[5]++;
                hw->wiphy->n_addresses++;
        }

        iwl_mvm_reset_phy_ctxts(mvm);

        hw->wiphy->max_scan_ie_len = iwl_mvm_max_scan_ie_len(mvm);

        hw->wiphy->max_scan_ssids = PROBE_OPTION_MAX;

        BUILD_BUG_ON(IWL_MVM_SCAN_STOPPING_MASK & IWL_MVM_SCAN_MASK);
        BUILD_BUG_ON(IWL_MVM_MAX_UMAC_SCANS > HWEIGHT32(IWL_MVM_SCAN_MASK) ||
                     IWL_MVM_MAX_LMAC_SCANS > HWEIGHT32(IWL_MVM_SCAN_MASK));

        if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_UMAC_SCAN))
                mvm->max_scans = IWL_MVM_MAX_UMAC_SCANS;
        else
                mvm->max_scans = IWL_MVM_MAX_LMAC_SCANS;

        if (mvm->nvm_data->bands[NL80211_BAND_2GHZ].n_channels)
                hw->wiphy->bands[NL80211_BAND_2GHZ] =
                        &mvm->nvm_data->bands[NL80211_BAND_2GHZ];
        if (mvm->nvm_data->bands[NL80211_BAND_5GHZ].n_channels) {
                hw->wiphy->bands[NL80211_BAND_5GHZ] =
                        &mvm->nvm_data->bands[NL80211_BAND_5GHZ];

                if (fw_has_capa(&mvm->fw->ucode_capa,
                                IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
                    fw_has_api(&mvm->fw->ucode_capa,
                               IWL_UCODE_TLV_API_LQ_SS_PARAMS))
                        hw->wiphy->bands[NL80211_BAND_5GHZ]->vht_cap.cap |=
                                IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE;
        }

        hw->wiphy->hw_version = mvm->trans->hw_id;

        if (iwlmvm_mod_params.power_scheme != IWL_POWER_SCHEME_CAM)
                hw->wiphy->flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
        else
                hw->wiphy->flags &= ~WIPHY_FLAG_PS_ON_BY_DEFAULT;

        hw->wiphy->max_sched_scan_reqs = 1;
        hw->wiphy->max_sched_scan_ssids = PROBE_OPTION_MAX;
        hw->wiphy->max_match_sets = IWL_SCAN_MAX_PROFILES;
        /* we create the 802.11 header and zero length SSID IE. */
        hw->wiphy->max_sched_scan_ie_len =
                SCAN_OFFLOAD_PROBE_REQ_SIZE - 24 - 2;
        hw->wiphy->max_sched_scan_plans = IWL_MAX_SCHED_SCAN_PLANS;
        hw->wiphy->max_sched_scan_plan_interval = U16_MAX;

        /*
         * the firmware uses u8 for num of iterations, but 0xff is saved for
         * infinite loop, so the maximum number of iterations is actually 254.
         */
        hw->wiphy->max_sched_scan_plan_iterations = 254;

        hw->wiphy->features |= NL80211_FEATURE_P2P_GO_CTWIN |
                               NL80211_FEATURE_LOW_PRIORITY_SCAN |
                               NL80211_FEATURE_P2P_GO_OPPPS |
                               NL80211_FEATURE_AP_MODE_CHAN_WIDTH_CHANGE |
                               NL80211_FEATURE_DYNAMIC_SMPS |
                               NL80211_FEATURE_STATIC_SMPS |
                               NL80211_FEATURE_SUPPORTS_WMM_ADMISSION;

        if (fw_has_capa(&mvm->fw->ucode_capa,
                        IWL_UCODE_TLV_CAPA_TXPOWER_INSERTION_SUPPORT))
                hw->wiphy->features |= NL80211_FEATURE_TX_POWER_INSERTION;
        if (fw_has_capa(&mvm->fw->ucode_capa,
                        IWL_UCODE_TLV_CAPA_QUIET_PERIOD_SUPPORT))
                hw->wiphy->features |= NL80211_FEATURE_QUIET;

        if (fw_has_capa(&mvm->fw->ucode_capa,
                        IWL_UCODE_TLV_CAPA_DS_PARAM_SET_IE_SUPPORT))
                hw->wiphy->features |=
                        NL80211_FEATURE_DS_PARAM_SET_IE_IN_PROBES;

        if (fw_has_capa(&mvm->fw->ucode_capa,
                        IWL_UCODE_TLV_CAPA_WFA_TPC_REP_IE_SUPPORT))
                hw->wiphy->features |= NL80211_FEATURE_WFA_TPC_IE_IN_PROBES;

        if (fw_has_api(&mvm->fw->ucode_capa,
                       IWL_UCODE_TLV_API_SCAN_TSF_REPORT)) {
                wiphy_ext_feature_set(hw->wiphy,
                                      NL80211_EXT_FEATURE_SCAN_START_TIME);
                wiphy_ext_feature_set(hw->wiphy,
                                      NL80211_EXT_FEATURE_BSS_PARENT_TSF);
                wiphy_ext_feature_set(hw->wiphy,
                                      NL80211_EXT_FEATURE_SET_SCAN_DWELL);
        }

        mvm->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;

#ifdef CONFIG_PM_SLEEP
        if (iwl_mvm_is_d0i3_supported(mvm) &&
            device_can_wakeup(mvm->trans->dev)) {
                mvm->wowlan.flags = WIPHY_WOWLAN_ANY;
                hw->wiphy->wowlan = &mvm->wowlan;
        }

        if (mvm->fw->img[IWL_UCODE_WOWLAN].num_sec &&
            mvm->trans->ops->d3_suspend &&
            mvm->trans->ops->d3_resume &&
            device_can_wakeup(mvm->trans->dev)) {
                mvm->wowlan.flags |= WIPHY_WOWLAN_MAGIC_PKT |
                                     WIPHY_WOWLAN_DISCONNECT |
                                     WIPHY_WOWLAN_EAP_IDENTITY_REQ |
                                     WIPHY_WOWLAN_RFKILL_RELEASE |
                                     WIPHY_WOWLAN_NET_DETECT;
                if (!iwlwifi_mod_params.swcrypto)
                        mvm->wowlan.flags |= WIPHY_WOWLAN_SUPPORTS_GTK_REKEY |
                                             WIPHY_WOWLAN_GTK_REKEY_FAILURE |
                                             WIPHY_WOWLAN_4WAY_HANDSHAKE;

                mvm->wowlan.n_patterns = IWL_WOWLAN_MAX_PATTERNS;
                mvm->wowlan.pattern_min_len = IWL_WOWLAN_MIN_PATTERN_LEN;
                mvm->wowlan.pattern_max_len = IWL_WOWLAN_MAX_PATTERN_LEN;
                mvm->wowlan.max_nd_match_sets = IWL_SCAN_MAX_PROFILES;
                mvm->wowlan.tcp = &iwl_mvm_wowlan_tcp_support;
                hw->wiphy->wowlan = &mvm->wowlan;
        }
#endif

#ifdef CONFIG_IWLWIFI_BCAST_FILTERING
        /* assign default bcast filtering configuration */
        mvm->bcast_filters = iwl_mvm_default_bcast_filters;
#endif

        ret = iwl_mvm_leds_init(mvm);
        if (ret)
                return ret;

        if (fw_has_capa(&mvm->fw->ucode_capa,
                        IWL_UCODE_TLV_CAPA_TDLS_SUPPORT)) {
                IWL_DEBUG_TDLS(mvm, "TDLS supported\n");
                hw->wiphy->flags |= WIPHY_FLAG_SUPPORTS_TDLS;
                ieee80211_hw_set(hw, TDLS_WIDER_BW);
        }

        if (fw_has_capa(&mvm->fw->ucode_capa,
                        IWL_UCODE_TLV_CAPA_TDLS_CHANNEL_SWITCH)) {
                IWL_DEBUG_TDLS(mvm, "TDLS channel switch supported\n");
                hw->wiphy->features |= NL80211_FEATURE_TDLS_CHANNEL_SWITCH;
        }

        hw->netdev_features |= mvm->cfg->features;
        if (!iwl_mvm_is_csum_supported(mvm)) {
                hw->netdev_features &= ~(IWL_TX_CSUM_NETIF_FLAGS |
                                         NETIF_F_RXCSUM);
                /* We may support SW TX CSUM */
                if (IWL_MVM_SW_TX_CSUM_OFFLOAD)
                        hw->netdev_features |= IWL_TX_CSUM_NETIF_FLAGS;
        }

        ret = ieee80211_register_hw(mvm->hw);
        if (ret)
                iwl_mvm_leds_exit(mvm);
        mvm->init_status |= IWL_MVM_INIT_STATUS_REG_HW_INIT_COMPLETE;

        if (mvm->cfg->vht_mu_mimo_supported)
                wiphy_ext_feature_set(hw->wiphy,
                                      NL80211_EXT_FEATURE_MU_MIMO_AIR_SNIFFER);

        return ret;
}

static bool iwl_mvm_defer_tx(struct iwl_mvm *mvm,
                             struct ieee80211_sta *sta,
                             struct sk_buff *skb)
{
        struct iwl_mvm_sta *mvmsta;
        bool defer = false;

        /*
         * double check the IN_D0I3 flag both before and after
         * taking the spinlock, in order to prevent taking
         * the spinlock when not needed.
         */
        if (likely(!test_bit(IWL_MVM_STATUS_IN_D0I3, &mvm->status)))
                return false;

        spin_lock(&mvm->d0i3_tx_lock);
        /*
         * testing the flag again ensures the skb dequeue
         * loop (on d0i3 exit) hasn't run yet.
         */
        if (!test_bit(IWL_MVM_STATUS_IN_D0I3, &mvm->status))
                goto out;

        mvmsta = iwl_mvm_sta_from_mac80211(sta);
        if (mvmsta->sta_id == IWL_MVM_INVALID_STA ||
            mvmsta->sta_id != mvm->d0i3_ap_sta_id)
                goto out;

        __skb_queue_tail(&mvm->d0i3_tx, skb);
        ieee80211_stop_queues(mvm->hw);

        /* trigger wakeup */
        iwl_mvm_ref(mvm, IWL_MVM_REF_TX);
        iwl_mvm_unref(mvm, IWL_MVM_REF_TX);

        defer = true;
out:
        spin_unlock(&mvm->d0i3_tx_lock);
        return defer;
}

static void iwl_mvm_mac_tx(struct ieee80211_hw *hw,
                           struct ieee80211_tx_control *control,
                           struct sk_buff *skb)
{
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
        struct ieee80211_sta *sta = control->sta;
        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
        struct ieee80211_hdr *hdr = (void *)skb->data;

        if (iwl_mvm_is_radio_killed(mvm)) {
                IWL_DEBUG_DROP(mvm, "Dropping - RF/CT KILL\n");
                goto drop;
        }

        if (info->hw_queue == IWL_MVM_OFFCHANNEL_QUEUE &&
            !test_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status) &&
            !test_bit(IWL_MVM_STATUS_ROC_AUX_RUNNING, &mvm->status))
                goto drop;

        /* treat non-bufferable MMPDUs on AP interfaces as broadcast */
        if ((info->control.vif->type == NL80211_IFTYPE_AP ||
             info->control.vif->type == NL80211_IFTYPE_ADHOC) &&
            ieee80211_is_mgmt(hdr->frame_control) &&
            !ieee80211_is_bufferable_mmpdu(hdr->frame_control))
                sta = NULL;

        if (sta) {
                if (iwl_mvm_defer_tx(mvm, sta, skb))
                        return;
                if (iwl_mvm_tx_skb(mvm, skb, sta))
                        goto drop;
                return;
        }

        if (iwl_mvm_tx_skb_non_sta(mvm, skb))
                goto drop;
        return;
 drop:
        ieee80211_free_txskb(hw, skb);
}

static inline bool iwl_enable_rx_ampdu(const struct iwl_cfg *cfg)
{
        if (iwlwifi_mod_params.disable_11n & IWL_DISABLE_HT_RXAGG)
                return false;
        return true;
}

static inline bool iwl_enable_tx_ampdu(const struct iwl_cfg *cfg)
{
        if (iwlwifi_mod_params.disable_11n & IWL_DISABLE_HT_TXAGG)
                return false;
        if (iwlwifi_mod_params.disable_11n & IWL_ENABLE_HT_TXAGG)
                return true;

        /* enabled by default */
        return true;
}

#define CHECK_BA_TRIGGER(_mvm, _trig, _tid_bm, _tid, _fmt...)           \
        do {                                                            \
                if (!(le16_to_cpu(_tid_bm) & BIT(_tid)))                \
                        break;                                          \
                iwl_fw_dbg_collect_trig(&(_mvm)->fwrt, _trig, _fmt);    \
        } while (0)

static void
iwl_mvm_ampdu_check_trigger(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
                            struct ieee80211_sta *sta, u16 tid, u16 rx_ba_ssn,
                            enum ieee80211_ampdu_mlme_action action)
{
        struct iwl_fw_dbg_trigger_tlv *trig;
        struct iwl_fw_dbg_trigger_ba *ba_trig;

        if (!iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_BA))
                return;

        trig = iwl_fw_dbg_get_trigger(mvm->fw, FW_DBG_TRIGGER_BA);
        ba_trig = (void *)trig->data;

        if (!iwl_fw_dbg_trigger_check_stop(&mvm->fwrt,
                                           ieee80211_vif_to_wdev(vif), trig))
                return;

        switch (action) {
        case IEEE80211_AMPDU_TX_OPERATIONAL: {
                struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
                struct iwl_mvm_tid_data *tid_data = &mvmsta->tid_data[tid];

                CHECK_BA_TRIGGER(mvm, trig, ba_trig->tx_ba_start, tid,
                                 "TX AGG START: MAC %pM tid %d ssn %d\n",
                                 sta->addr, tid, tid_data->ssn);
                break;
                }
        case IEEE80211_AMPDU_TX_STOP_CONT:
                CHECK_BA_TRIGGER(mvm, trig, ba_trig->tx_ba_stop, tid,
                                 "TX AGG STOP: MAC %pM tid %d\n",
                                 sta->addr, tid);
                break;
        case IEEE80211_AMPDU_RX_START:
                CHECK_BA_TRIGGER(mvm, trig, ba_trig->rx_ba_start, tid,
                                 "RX AGG START: MAC %pM tid %d ssn %d\n",
                                 sta->addr, tid, rx_ba_ssn);
                break;
        case IEEE80211_AMPDU_RX_STOP:
                CHECK_BA_TRIGGER(mvm, trig, ba_trig->rx_ba_stop, tid,
                                 "RX AGG STOP: MAC %pM tid %d\n",
                                 sta->addr, tid);
                break;
        default:
                break;
        }
}

static int iwl_mvm_mac_ampdu_action(struct ieee80211_hw *hw,
                                    struct ieee80211_vif *vif,
                                    struct ieee80211_ampdu_params *params)
{
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
        int ret;
        bool tx_agg_ref = false;
        struct ieee80211_sta *sta = params->sta;
        enum ieee80211_ampdu_mlme_action action = params->action;
        u16 tid = params->tid;
        u16 *ssn = &params->ssn;
        u8 buf_size = params->buf_size;
        bool amsdu = params->amsdu;
        u16 timeout = params->timeout;

        IWL_DEBUG_HT(mvm, "A-MPDU action on addr %pM tid %d: action %d\n",
                     sta->addr, tid, action);

        if (!(mvm->nvm_data->sku_cap_11n_enable))
                return -EACCES;

        /* return from D0i3 before starting a new Tx aggregation */
        switch (action) {
        case IEEE80211_AMPDU_TX_START:
        case IEEE80211_AMPDU_TX_STOP_CONT:
        case IEEE80211_AMPDU_TX_STOP_FLUSH:
        case IEEE80211_AMPDU_TX_STOP_FLUSH_CONT:
        case IEEE80211_AMPDU_TX_OPERATIONAL:
                /*
                 * for tx start, wait synchronously until D0i3 exit to
                 * get the correct sequence number for the tid.
                 * additionally, some other ampdu actions use direct
                 * target access, which is not handled automatically
                 * by the trans layer (unlike commands), so wait for
                 * d0i3 exit in these cases as well.
                 */
                ret = iwl_mvm_ref_sync(mvm, IWL_MVM_REF_TX_AGG);
                if (ret)
                        return ret;

                tx_agg_ref = true;
                break;
        default:
                break;
        }

        mutex_lock(&mvm->mutex);

        switch (action) {
        case IEEE80211_AMPDU_RX_START:
                if (!iwl_enable_rx_ampdu(mvm->cfg)) {
                        ret = -EINVAL;
                        break;
                }
                ret = iwl_mvm_sta_rx_agg(mvm, sta, tid, *ssn, true, buf_size,
                                         timeout);
                break;
        case IEEE80211_AMPDU_RX_STOP:
                ret = iwl_mvm_sta_rx_agg(mvm, sta, tid, 0, false, buf_size,
                                         timeout);
                break;
        case IEEE80211_AMPDU_TX_START:
                if (!iwl_enable_tx_ampdu(mvm->cfg)) {
                        ret = -EINVAL;
                        break;
                }
                ret = iwl_mvm_sta_tx_agg_start(mvm, vif, sta, tid, ssn);
                break;
        case IEEE80211_AMPDU_TX_STOP_CONT:
                ret = iwl_mvm_sta_tx_agg_stop(mvm, vif, sta, tid);
                break;
        case IEEE80211_AMPDU_TX_STOP_FLUSH:
        case IEEE80211_AMPDU_TX_STOP_FLUSH_CONT:
                ret = iwl_mvm_sta_tx_agg_flush(mvm, vif, sta, tid);
                break;
        case IEEE80211_AMPDU_TX_OPERATIONAL:
                ret = iwl_mvm_sta_tx_agg_oper(mvm, vif, sta, tid,
                                              buf_size, amsdu);
                break;
        default:
                WARN_ON_ONCE(1);
                ret = -EINVAL;
                break;
        }

        if (!ret) {
                u16 rx_ba_ssn = 0;

                if (action == IEEE80211_AMPDU_RX_START)
                        rx_ba_ssn = *ssn;

                iwl_mvm_ampdu_check_trigger(mvm, vif, sta, tid,

                                            rx_ba_ssn, action);
        }
        mutex_unlock(&mvm->mutex);

        /*
         * If the tid is marked as started, we won't use it for offloaded
         * traffic on the next D0i3 entry. It's safe to unref.
         */
        if (tx_agg_ref)
                iwl_mvm_unref(mvm, IWL_MVM_REF_TX_AGG);

        return ret;
}

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

        mvmvif->uploaded = false;
        mvmvif->ap_sta_id = IWL_MVM_INVALID_STA;

        spin_lock_bh(&mvm->time_event_lock);
        iwl_mvm_te_clear_data(mvm, &mvmvif->time_event_data);
        spin_unlock_bh(&mvm->time_event_lock);

        mvmvif->phy_ctxt = NULL;
        memset(&mvmvif->bf_data, 0, sizeof(mvmvif->bf_data));
}

static void iwl_mvm_restart_cleanup(struct iwl_mvm *mvm)
{
        /* clear the D3 reconfig, we only need it to avoid dumping a
         * firmware coredump on reconfiguration, we shouldn't do that
         * on D3->D0 transition
         */
        if (!test_and_clear_bit(IWL_MVM_STATUS_D3_RECONFIG, &mvm->status)) {
                mvm->fwrt.dump.desc = &iwl_dump_desc_assert;
                iwl_fw_error_dump(&mvm->fwrt);
        }

        /* cleanup all stale references (scan, roc), but keep the
         * ucode_down ref until reconfig is complete
         */
        iwl_mvm_unref_all_except(mvm, IWL_MVM_REF_UCODE_DOWN);

        iwl_mvm_stop_device(mvm);

        mvm->scan_status = 0;
        mvm->ps_disabled = false;
        mvm->calibrating = false;

        /* just in case one was running */
        iwl_mvm_cleanup_roc_te(mvm);
        ieee80211_remain_on_channel_expired(mvm->hw);

        /*
         * cleanup all interfaces, even inactive ones, as some might have
         * gone down during the HW restart
         */
        ieee80211_iterate_interfaces(mvm->hw, 0, iwl_mvm_cleanup_iterator, mvm);

        mvm->p2p_device_vif = NULL;
        mvm->d0i3_ap_sta_id = IWL_MVM_INVALID_STA;

        iwl_mvm_reset_phy_ctxts(mvm);
        memset(mvm->fw_key_table, 0, sizeof(mvm->fw_key_table));
        memset(mvm->sta_deferred_frames, 0, sizeof(mvm->sta_deferred_frames));
        memset(&mvm->last_bt_notif, 0, sizeof(mvm->last_bt_notif));
        memset(&mvm->last_bt_ci_cmd, 0, sizeof(mvm->last_bt_ci_cmd));

        ieee80211_wake_queues(mvm->hw);

        /* clear any stale d0i3 state */
        clear_bit(IWL_MVM_STATUS_IN_D0I3, &mvm->status);

        mvm->vif_count = 0;
        mvm->rx_ba_sessions = 0;
        mvm->fwrt.dump.conf = FW_DBG_INVALID;
        mvm->monitor_on = false;

        /* keep statistics ticking */
        iwl_mvm_accu_radio_stats(mvm);
}

int __iwl_mvm_mac_start(struct iwl_mvm *mvm)
{
        int ret;

        lockdep_assert_held(&mvm->mutex);

        if (test_bit(IWL_MVM_STATUS_HW_RESTART_REQUESTED, &mvm->status)) {
                /*
                 * Now convert the HW_RESTART_REQUESTED flag to IN_HW_RESTART
                 * so later code will - from now on - see that we're doing it.
                 */
                set_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status);
                clear_bit(IWL_MVM_STATUS_HW_RESTART_REQUESTED, &mvm->status);
                /* Clean up some internal and mac80211 state on restart */
                iwl_mvm_restart_cleanup(mvm);
        } else {
                /* Hold the reference to prevent runtime suspend while
                 * the start procedure runs.  It's a bit confusing
                 * that the UCODE_DOWN reference is taken, but it just
                 * means "UCODE is not UP yet". ( TODO: rename this
                 * reference).
                 */
                iwl_mvm_ref(mvm, IWL_MVM_REF_UCODE_DOWN);
        }
        ret = iwl_mvm_up(mvm);

        if (ret && test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status)) {
                /* Something went wrong - we need to finish some cleanup
                 * that normally iwl_mvm_mac_restart_complete() below
                 * would do.
                 */
                clear_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status);
                iwl_mvm_d0i3_enable_tx(mvm, NULL);
        }

        return ret;
}

static int iwl_mvm_mac_start(struct ieee80211_hw *hw)
{
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
        int ret;

        /* Some hw restart cleanups must not hold the mutex */
        if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status)) {
                /*
                 * Make sure we are out of d0i3. This is needed
                 * to make sure the reference accounting is correct
                 * (and there is no stale d0i3_exit_work).
                 */
                wait_event_timeout(mvm->d0i3_exit_waitq,
                                   !test_bit(IWL_MVM_STATUS_IN_D0I3,
                                             &mvm->status),
                                   HZ);
        }

        mutex_lock(&mvm->mutex);
        ret = __iwl_mvm_mac_start(mvm);
        mutex_unlock(&mvm->mutex);

        return ret;
}

static void iwl_mvm_restart_complete(struct iwl_mvm *mvm)
{
        int ret;

        mutex_lock(&mvm->mutex);

        clear_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status);
        iwl_mvm_d0i3_enable_tx(mvm, NULL);
        ret = iwl_mvm_update_quotas(mvm, true, NULL);
        if (ret)
                IWL_ERR(mvm, "Failed to update quotas after restart (%d)\n",
                        ret);

        /* allow transport/FW low power modes */
        iwl_mvm_unref(mvm, IWL_MVM_REF_UCODE_DOWN);

        /*
         * If we have TDLS peers, remove them. We don't know the last seqno/PN
         * of packets the FW sent out, so we must reconnect.
         */
        iwl_mvm_teardown_tdls_peers(mvm);

        mutex_unlock(&mvm->mutex);
}

static void iwl_mvm_resume_complete(struct iwl_mvm *mvm)
{
        if (iwl_mvm_is_d0i3_supported(mvm) &&
            iwl_mvm_enter_d0i3_on_suspend(mvm))
                WARN_ONCE(!wait_event_timeout(mvm->d0i3_exit_waitq,
                                              !test_bit(IWL_MVM_STATUS_IN_D0I3,
                                                        &mvm->status),
                                              HZ),
                          "D0i3 exit on resume timed out\n");
}

static void
iwl_mvm_mac_reconfig_complete(struct ieee80211_hw *hw,
                              enum ieee80211_reconfig_type reconfig_type)
{
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);

        switch (reconfig_type) {
        case IEEE80211_RECONFIG_TYPE_RESTART:
                iwl_mvm_restart_complete(mvm);
                break;
        case IEEE80211_RECONFIG_TYPE_SUSPEND:
                iwl_mvm_resume_complete(mvm);
                break;
        }
}

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

        /* firmware counters are obviously reset now, but we shouldn't
         * partially track so also clear the fw_reset_accu counters.
         */
        memset(&mvm->accu_radio_stats, 0, sizeof(mvm->accu_radio_stats));

        /* async_handlers_wk is now blocked */

        /*
         * The work item could be running or queued if the
         * ROC time event stops just as we get here.
         */
        flush_work(&mvm->roc_done_wk);

        iwl_mvm_stop_device(mvm);

        iwl_mvm_async_handlers_purge(mvm);
        /* async_handlers_list is empty and will stay empty: HW is stopped */

        /* the fw is stopped, the aux sta is dead: clean up driver state */
        iwl_mvm_del_aux_sta(mvm);

        /*
         * Clear IN_HW_RESTART flag when stopping the hw (as restart_complete()
         * won't be called in this case).
         * But make sure to cleanup interfaces that have gone down before/during
         * HW restart was requested.
         */
        if (test_and_clear_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status))
                ieee80211_iterate_interfaces(mvm->hw, 0,
                                             iwl_mvm_cleanup_iterator, mvm);

        /* We shouldn't have any UIDs still set.  Loop over all the UIDs to
         * make sure there's nothing left there and warn if any is found.
         */
        if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_UMAC_SCAN)) {
                int i;

                for (i = 0; i < mvm->max_scans; i++) {
                        if (WARN_ONCE(mvm->scan_uid_status[i],
                                      "UMAC scan UID %d status was not cleaned\n",
                                      i))
                                mvm->scan_uid_status[i] = 0;
                }
        }
}

static void iwl_mvm_mac_stop(struct ieee80211_hw *hw)
{
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);

        flush_work(&mvm->d0i3_exit_work);
        flush_work(&mvm->async_handlers_wk);
        flush_work(&mvm->add_stream_wk);

        /*
         * Lock and clear the firmware running bit here already, so that
         * new commands coming in elsewhere, e.g. from debugfs, will not
         * be able to proceed. This is important here because one of those
         * debugfs files causes the firmware dump to be triggered, and if we
         * don't stop debugfs accesses before canceling that it could be
         * retriggered after we flush it but before we've cleared the bit.
         */
        clear_bit(IWL_MVM_STATUS_FIRMWARE_RUNNING, &mvm->status);

        iwl_fw_cancel_dump(&mvm->fwrt);
        cancel_delayed_work_sync(&mvm->cs_tx_unblock_dwork);
        cancel_delayed_work_sync(&mvm->scan_timeout_dwork);
        iwl_fw_free_dump_desc(&mvm->fwrt);

        mutex_lock(&mvm->mutex);
        __iwl_mvm_mac_stop(mvm);
        mutex_unlock(&mvm->mutex);

        /*
         * The worker might have been waiting for the mutex, let it run and
         * discover that its list is now empty.
         */
        cancel_work_sync(&mvm->async_handlers_wk);
}

static struct iwl_mvm_phy_ctxt *iwl_mvm_get_free_phy_ctxt(struct iwl_mvm *mvm)
{
        u16 i;

        lockdep_assert_held(&mvm->mutex);

        for (i = 0; i < NUM_PHY_CTX; i++)
                if (!mvm->phy_ctxts[i].ref)
                        return &mvm->phy_ctxts[i];

        IWL_ERR(mvm, "No available PHY context\n");
        return NULL;
}

static int iwl_mvm_set_tx_power(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
                                s16 tx_power)
{
        struct iwl_dev_tx_power_cmd cmd = {
                .v3.set_mode = cpu_to_le32(IWL_TX_POWER_MODE_SET_MAC),
                .v3.mac_context_id =
                        cpu_to_le32(iwl_mvm_vif_from_mac80211(vif)->id),
                .v3.pwr_restriction = cpu_to_le16(8 * tx_power),
        };
        int len = sizeof(cmd);

        if (tx_power == IWL_DEFAULT_MAX_TX_POWER)
                cmd.v3.pwr_restriction = cpu_to_le16(IWL_DEV_MAX_TX_POWER);

        if (!fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_TX_POWER_ACK))
                len = sizeof(cmd.v3);

        return iwl_mvm_send_cmd_pdu(mvm, REDUCE_TX_POWER_CMD, 0, len, &cmd);
}

static int iwl_mvm_mac_add_interface(struct ieee80211_hw *hw,
                                     struct ieee80211_vif *vif)
{
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
        int ret;

        mvmvif->mvm = mvm;

        /*
         * make sure D0i3 exit is completed, otherwise a target access
         * during tx queue configuration could be done when still in
         * D0i3 state.
         */
        ret = iwl_mvm_ref_sync(mvm, IWL_MVM_REF_ADD_IF);
        if (ret)
                return ret;

        /*
         * Not much to do here. The stack will not allow interface
         * types or combinations that we didn't advertise, so we
         * don't really have to check the types.
         */

        mutex_lock(&mvm->mutex);

        /* make sure that beacon statistics don't go backwards with FW reset */
        if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status))
                mvmvif->beacon_stats.accu_num_beacons +=
                        mvmvif->beacon_stats.num_beacons;

        /* Allocate resources for the MAC context, and add it to the fw  */
        ret = iwl_mvm_mac_ctxt_init(mvm, vif);
        if (ret)
                goto out_unlock;

        /* Counting number of interfaces is needed for legacy PM */
        if (vif->type != NL80211_IFTYPE_P2P_DEVICE)
                mvm->vif_count++;

        /*
         * The AP binding flow can be done only after the beacon
         * template is configured (which happens only in the mac80211
         * start_ap() flow), and adding the broadcast station can happen
         * only after the binding.
         * In addition, since modifying the MAC before adding a bcast
         * station is not allowed by the FW, delay the adding of MAC context to
         * the point where we can also add the bcast station.
         * In short: there's not much we can do at this point, other than
         * allocating resources :)
         */
        if (vif->type == NL80211_IFTYPE_AP ||
            vif->type == NL80211_IFTYPE_ADHOC) {
                ret = iwl_mvm_alloc_bcast_sta(mvm, vif);
                if (ret) {
                        IWL_ERR(mvm, "Failed to allocate bcast sta\n");
                        goto out_release;
                }

                /*
                 * Only queue for this station is the mcast queue,
                 * which shouldn't be in TFD mask anyway
                 */
                ret = iwl_mvm_allocate_int_sta(mvm, &mvmvif->mcast_sta,
                                               0, vif->type,
                                               IWL_STA_MULTICAST);
                if (ret)
                        goto out_release;

                iwl_mvm_vif_dbgfs_register(mvm, vif);
                goto out_unlock;
        }

        mvmvif->features |= hw->netdev_features;

        ret = iwl_mvm_mac_ctxt_add(mvm, vif);
        if (ret)
                goto out_release;

        ret = iwl_mvm_power_update_mac(mvm);
        if (ret)
                goto out_remove_mac;

        /* beacon filtering */
        ret = iwl_mvm_disable_beacon_filter(mvm, vif, 0);
        if (ret)
                goto out_remove_mac;

        if (!mvm->bf_allowed_vif &&
            vif->type == NL80211_IFTYPE_STATION && !vif->p2p) {
                mvm->bf_allowed_vif = mvmvif;
                vif->driver_flags |= IEEE80211_VIF_BEACON_FILTER |
                                     IEEE80211_VIF_SUPPORTS_CQM_RSSI;
        }

        /*
         * P2P_DEVICE interface does not have a channel context assigned to it,
         * so a dedicated PHY context is allocated to it and the corresponding
         * MAC context is bound to it at this stage.
         */
        if (vif->type == NL80211_IFTYPE_P2P_DEVICE) {

                mvmvif->phy_ctxt = iwl_mvm_get_free_phy_ctxt(mvm);
                if (!mvmvif->phy_ctxt) {
                        ret = -ENOSPC;
                        goto out_free_bf;
                }

                iwl_mvm_phy_ctxt_ref(mvm, mvmvif->phy_ctxt);
                ret = iwl_mvm_binding_add_vif(mvm, vif);
                if (ret)
                        goto out_unref_phy;

                ret = iwl_mvm_add_p2p_bcast_sta(mvm, vif);
                if (ret)
                        goto out_unbind;

                /* Save a pointer to p2p device vif, so it can later be used to
                 * update the p2p device MAC when a GO is started/stopped */
                mvm->p2p_device_vif = vif;
        }

        if (vif->type == NL80211_IFTYPE_MONITOR)
                mvm->monitor_on = true;

        iwl_mvm_vif_dbgfs_register(mvm, vif);
        goto out_unlock;

 out_unbind:
        iwl_mvm_binding_remove_vif(mvm, vif);
 out_unref_phy:
        iwl_mvm_phy_ctxt_unref(mvm, mvmvif->phy_ctxt);
 out_free_bf:
        if (mvm->bf_allowed_vif == mvmvif) {
                mvm->bf_allowed_vif = NULL;
                vif->driver_flags &= ~(IEEE80211_VIF_BEACON_FILTER |
                                       IEEE80211_VIF_SUPPORTS_CQM_RSSI);
        }
 out_remove_mac:
        mvmvif->phy_ctxt = NULL;
        iwl_mvm_mac_ctxt_remove(mvm, vif);
 out_release:
        if (vif->type != NL80211_IFTYPE_P2P_DEVICE)
                mvm->vif_count--;
 out_unlock:
        mutex_unlock(&mvm->mutex);

        iwl_mvm_unref(mvm, IWL_MVM_REF_ADD_IF);

        return ret;
}

static void iwl_mvm_prepare_mac_removal(struct iwl_mvm *mvm,
                                        struct ieee80211_vif *vif)
{
        if (vif->type == NL80211_IFTYPE_P2P_DEVICE) {
                /*
                 * Flush the ROC worker which will flush the OFFCHANNEL queue.
                 * We assume here that all the packets sent to the OFFCHANNEL
                 * queue are sent in ROC session.
                 */
                flush_work(&mvm->roc_done_wk);
        }
}

static void iwl_mvm_mac_remove_interface(struct ieee80211_hw *hw,
                                         struct ieee80211_vif *vif)
{
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);

        iwl_mvm_prepare_mac_removal(mvm, vif);

        mutex_lock(&mvm->mutex);

        if (mvm->bf_allowed_vif == mvmvif) {
                mvm->bf_allowed_vif = NULL;
                vif->driver_flags &= ~(IEEE80211_VIF_BEACON_FILTER |
                                       IEEE80211_VIF_SUPPORTS_CQM_RSSI);
        }

        iwl_mvm_vif_dbgfs_clean(mvm, vif);

        /*
         * For AP/GO interface, the tear down of the resources allocated to the
         * interface is be handled as part of the stop_ap flow.
         */
        if (vif->type == NL80211_IFTYPE_AP ||
            vif->type == NL80211_IFTYPE_ADHOC) {
#ifdef CONFIG_NL80211_TESTMODE
                if (vif == mvm->noa_vif) {
                        mvm->noa_vif = NULL;
                        mvm->noa_duration = 0;
                }
#endif
                iwl_mvm_dealloc_int_sta(mvm, &mvmvif->mcast_sta);
                iwl_mvm_dealloc_bcast_sta(mvm, vif);
                goto out_release;
        }

        if (vif->type == NL80211_IFTYPE_P2P_DEVICE) {
                mvm->p2p_device_vif = NULL;
                iwl_mvm_rm_p2p_bcast_sta(mvm, vif);
                iwl_mvm_binding_remove_vif(mvm, vif);
                iwl_mvm_phy_ctxt_unref(mvm, mvmvif->phy_ctxt);
                mvmvif->phy_ctxt = NULL;
        }

        if (mvm->vif_count && vif->type != NL80211_IFTYPE_P2P_DEVICE)
                mvm->vif_count--;

        iwl_mvm_power_update_mac(mvm);
        iwl_mvm_mac_ctxt_remove(mvm, vif);

        if (vif->type == NL80211_IFTYPE_MONITOR)
                mvm->monitor_on = false;

out_release:
        mutex_unlock(&mvm->mutex);
}

static int iwl_mvm_mac_config(struct ieee80211_hw *hw, u32 changed)
{
        return 0;
}

struct iwl_mvm_mc_iter_data {
        struct iwl_mvm *mvm;
        int port_id;
};

static void iwl_mvm_mc_iface_iterator(void *_data, u8 *mac,
                                      struct ieee80211_vif *vif)
{
        struct iwl_mvm_mc_iter_data *data = _data;
        struct iwl_mvm *mvm = data->mvm;
        struct iwl_mcast_filter_cmd *cmd = mvm->mcast_filter_cmd;
        struct iwl_host_cmd hcmd = {
                .id = MCAST_FILTER_CMD,
                .flags = CMD_ASYNC,
                .dataflags[0] = IWL_HCMD_DFL_NOCOPY,
        };
        int ret, len;

        /* if we don't have free ports, mcast frames will be dropped */
        if (WARN_ON_ONCE(data->port_id >= MAX_PORT_ID_NUM))
                return;

        if (vif->type != NL80211_IFTYPE_STATION ||
            !vif->bss_conf.assoc)
                return;

        cmd->port_id = data->port_id++;
        memcpy(cmd->bssid, vif->bss_conf.bssid, ETH_ALEN);
        len = roundup(sizeof(*cmd) + cmd->count * ETH_ALEN, 4);

        hcmd.len[0] = len;
        hcmd.data[0] = cmd;

        ret = iwl_mvm_send_cmd(mvm, &hcmd);
        if (ret)
                IWL_ERR(mvm, "mcast filter cmd error. ret=%d\n", ret);
}

static void iwl_mvm_recalc_multicast(struct iwl_mvm *mvm)
{
        struct iwl_mvm_mc_iter_data iter_data = {
                .mvm = mvm,
        };

        lockdep_assert_held(&mvm->mutex);

        if (WARN_ON_ONCE(!mvm->mcast_filter_cmd))
                return;

        ieee80211_iterate_active_interfaces_atomic(
                mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
                iwl_mvm_mc_iface_iterator, &iter_data);
}

static u64 iwl_mvm_prepare_multicast(struct ieee80211_hw *hw,
                                     struct netdev_hw_addr_list *mc_list)
{
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
        struct iwl_mcast_filter_cmd *cmd;
        struct netdev_hw_addr *addr;
        int addr_count;
        bool pass_all;
        int len;

        addr_count = netdev_hw_addr_list_count(mc_list);
        pass_all = addr_count > MAX_MCAST_FILTERING_ADDRESSES ||
                   IWL_MVM_FW_MCAST_FILTER_PASS_ALL;
        if (pass_all)
                addr_count = 0;

        len = roundup(sizeof(*cmd) + addr_count * ETH_ALEN, 4);
        cmd = kzalloc(len, GFP_ATOMIC);
        if (!cmd)
                return 0;

        if (pass_all) {
                cmd->pass_all = 1;
                return (u64)(unsigned long)cmd;
        }

        netdev_hw_addr_list_for_each(addr, mc_list) {
                IWL_DEBUG_MAC80211(mvm, "mcast addr (%d): %pM\n",
                                   cmd->count, addr->addr);
                memcpy(&cmd->addr_list[cmd->count * ETH_ALEN],
                       addr->addr, ETH_ALEN);
                cmd->count++;
        }

        return (u64)(unsigned long)cmd;
}

static void iwl_mvm_configure_filter(struct ieee80211_hw *hw,
                                     unsigned int changed_flags,
                                     unsigned int *total_flags,
                                     u64 multicast)
{
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
        struct iwl_mcast_filter_cmd *cmd = (void *)(unsigned long)multicast;

        mutex_lock(&mvm->mutex);

        /* replace previous configuration */
        kfree(mvm->mcast_filter_cmd);
        mvm->mcast_filter_cmd = cmd;

        if (!cmd)
                goto out;

        if (changed_flags & FIF_ALLMULTI)
                cmd->pass_all = !!(*total_flags & FIF_ALLMULTI);

        if (cmd->pass_all)
                cmd->count = 0;

        iwl_mvm_recalc_multicast(mvm);
out:
        mutex_unlock(&mvm->mutex);
        *total_flags = 0;
}

static void iwl_mvm_config_iface_filter(struct ieee80211_hw *hw,
                                        struct ieee80211_vif *vif,
                                        unsigned int filter_flags,
                                        unsigned int changed_flags)
{
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);

        /* We support only filter for probe requests */
        if (!(changed_flags & FIF_PROBE_REQ))
                return;

        /* Supported only for p2p client interfaces */
        if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc ||
            !vif->p2p)
                return;

        mutex_lock(&mvm->mutex);
        iwl_mvm_mac_ctxt_changed(mvm, vif, false, NULL);
        mutex_unlock(&mvm->mutex);
}

#ifdef CONFIG_IWLWIFI_BCAST_FILTERING
struct iwl_bcast_iter_data {
        struct iwl_mvm *mvm;
        struct iwl_bcast_filter_cmd *cmd;
        u8 current_filter;
};

static void
iwl_mvm_set_bcast_filter(struct ieee80211_vif *vif,
                         const struct iwl_fw_bcast_filter *in_filter,
                         struct iwl_fw_bcast_filter *out_filter)
{
        struct iwl_fw_bcast_filter_attr *attr;
        int i;

        memcpy(out_filter, in_filter, sizeof(*out_filter));

        for (i = 0; i < ARRAY_SIZE(out_filter->attrs); i++) {
                attr = &out_filter->attrs[i];

                if (!attr->mask)
                        break;

                switch (attr->reserved1) {
                case cpu_to_le16(BC_FILTER_MAGIC_IP):
                        if (vif->bss_conf.arp_addr_cnt != 1) {
                                attr->mask = 0;
                                continue;
                        }

                        attr->val = vif->bss_conf.arp_addr_list[0];
                        break;
                case cpu_to_le16(BC_FILTER_MAGIC_MAC):
                        attr->val = *(__be32 *)&vif->addr[2];
                        break;
                default:
                        break;
                }
                attr->reserved1 = 0;
                out_filter->num_attrs++;
        }
}

static void iwl_mvm_bcast_filter_iterator(void *_data, u8 *mac,
                                          struct ieee80211_vif *vif)
{
        struct iwl_bcast_iter_data *data = _data;
        struct iwl_mvm *mvm = data->mvm;
        struct iwl_bcast_filter_cmd *cmd = data->cmd;
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
        struct iwl_fw_bcast_mac *bcast_mac;
        int i;

        if (WARN_ON(mvmvif->id >= ARRAY_SIZE(cmd->macs)))
                return;

        bcast_mac = &cmd->macs[mvmvif->id];

        /*
         * enable filtering only for associated stations, but not for P2P
         * Clients
         */
        if (vif->type != NL80211_IFTYPE_STATION || vif->p2p ||
            !vif->bss_conf.assoc)
                return;

        bcast_mac->default_discard = 1;

        /* copy all configured filters */
        for (i = 0; mvm->bcast_filters[i].attrs[0].mask; i++) {
                /*
                 * Make sure we don't exceed our filters limit.
                 * if there is still a valid filter to be configured,
                 * be on the safe side and just allow bcast for this mac.
                 */
                if (WARN_ON_ONCE(data->current_filter >=
                                 ARRAY_SIZE(cmd->filters))) {
                        bcast_mac->default_discard = 0;
                        bcast_mac->attached_filters = 0;
                        break;
                }

                iwl_mvm_set_bcast_filter(vif,
                                         &mvm->bcast_filters[i],
                                         &cmd->filters[data->current_filter]);

                /* skip current filter if it contains no attributes */
                if (!cmd->filters[data->current_filter].num_attrs)
                        continue;

                /* attach the filter to current mac */
                bcast_mac->attached_filters |=
                                cpu_to_le16(BIT(data->current_filter));

                data->current_filter++;
        }
}

bool iwl_mvm_bcast_filter_build_cmd(struct iwl_mvm *mvm,
                                    struct iwl_bcast_filter_cmd *cmd)
{
        struct iwl_bcast_iter_data iter_data = {
                .mvm = mvm,
                .cmd = cmd,
        };

        if (IWL_MVM_FW_BCAST_FILTER_PASS_ALL)
                return false;

        memset(cmd, 0, sizeof(*cmd));
        cmd->max_bcast_filters = ARRAY_SIZE(cmd->filters);
        cmd->max_macs = ARRAY_SIZE(cmd->macs);

#ifdef CONFIG_IWLWIFI_DEBUGFS
        /* use debugfs filters/macs if override is configured */
        if (mvm->dbgfs_bcast_filtering.override) {
                memcpy(cmd->filters, &mvm->dbgfs_bcast_filtering.cmd.filters,
                       sizeof(cmd->filters));
                memcpy(cmd->macs, &mvm->dbgfs_bcast_filtering.cmd.macs,
                       sizeof(cmd->macs));
                return true;
        }
#endif

        /* if no filters are configured, do nothing */
        if (!mvm->bcast_filters)
                return false;

        /* configure and attach these filters for each associated sta vif */
        ieee80211_iterate_active_interfaces(
                mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
                iwl_mvm_bcast_filter_iterator, &iter_data);

        return true;
}

static int iwl_mvm_configure_bcast_filter(struct iwl_mvm *mvm)
{
        struct iwl_bcast_filter_cmd cmd;

        if (!(mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_BCAST_FILTERING))
                return 0;

        if (!iwl_mvm_bcast_filter_build_cmd(mvm, &cmd))
                return 0;

        return iwl_mvm_send_cmd_pdu(mvm, BCAST_FILTER_CMD, 0,
                                    sizeof(cmd), &cmd);
}
#else
static inline int iwl_mvm_configure_bcast_filter(struct iwl_mvm *mvm)
{
        return 0;
}
#endif

static int iwl_mvm_update_mu_groups(struct iwl_mvm *mvm,
                                    struct ieee80211_vif *vif)
{
        struct iwl_mu_group_mgmt_cmd cmd = {};

        memcpy(cmd.membership_status, vif->bss_conf.mu_group.membership,
               WLAN_MEMBERSHIP_LEN);
        memcpy(cmd.user_position, vif->bss_conf.mu_group.position,
               WLAN_USER_POSITION_LEN);

        return iwl_mvm_send_cmd_pdu(mvm,
                                    WIDE_ID(DATA_PATH_GROUP,
                                            UPDATE_MU_GROUPS_CMD),
                                    0, sizeof(cmd), &cmd);
}

static void iwl_mvm_mu_mimo_iface_iterator(void *_data, u8 *mac,
                                           struct ieee80211_vif *vif)
{
        if (vif->mu_mimo_owner) {
                struct iwl_mu_group_mgmt_notif *notif = _data;

                /*
                 * MU-MIMO Group Id action frame is little endian. We treat
                 * the data received from firmware as if it came from the
                 * action frame, so no conversion is needed.
                 */
                ieee80211_update_mu_groups(vif,
                                           (u8 *)&notif->membership_status,
                                           (u8 *)&notif->user_position);
        }
}

void iwl_mvm_mu_mimo_grp_notif(struct iwl_mvm *mvm,
                               struct iwl_rx_cmd_buffer *rxb)
{
        struct iwl_rx_packet *pkt = rxb_addr(rxb);
        struct iwl_mu_group_mgmt_notif *notif = (void *)pkt->data;

        ieee80211_iterate_active_interfaces_atomic(
                        mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
                        iwl_mvm_mu_mimo_iface_iterator, notif);
}

static void iwl_mvm_bss_info_changed_station(struct iwl_mvm *mvm,
                                             struct ieee80211_vif *vif,
                                             struct ieee80211_bss_conf *bss_conf,
                                             u32 changes)
{
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
        int ret;

        /*
         * Re-calculate the tsf id, as the master-slave relations depend on the
         * beacon interval, which was not known when the station interface was
         * added.
         */
        if (changes & BSS_CHANGED_ASSOC && bss_conf->assoc)
                iwl_mvm_mac_ctxt_recalc_tsf_id(mvm, vif);

        if (changes & BSS_CHANGED_ASSOC && !bss_conf->assoc &&
            mvmvif->lqm_active)
                iwl_mvm_send_lqm_cmd(vif, LQM_CMD_OPERATION_STOP_MEASUREMENT,
                                     0, 0);

        /*
         * If we're not associated yet, take the (new) BSSID before associating
         * so the firmware knows. If we're already associated, then use the old
         * BSSID here, and we'll send a cleared one later in the CHANGED_ASSOC
         * branch for disassociation below.
         */
        if (changes & BSS_CHANGED_BSSID && !mvmvif->associated)
                memcpy(mvmvif->bssid, bss_conf->bssid, ETH_ALEN);

        ret = iwl_mvm_mac_ctxt_changed(mvm, vif, false, mvmvif->bssid);
        if (ret)
                IWL_ERR(mvm, "failed to update MAC %pM\n", vif->addr);

        /* after sending it once, adopt mac80211 data */
        memcpy(mvmvif->bssid, bss_conf->bssid, ETH_ALEN);
        mvmvif->associated = bss_conf->assoc;

        if (changes & BSS_CHANGED_ASSOC) {
                if (bss_conf->assoc) {
                        /* clear statistics to get clean beacon counter */
                        iwl_mvm_request_statistics(mvm, true);
                        memset(&mvmvif->beacon_stats, 0,
                               sizeof(mvmvif->beacon_stats));

                        /* add quota for this interface */
                        ret = iwl_mvm_update_quotas(mvm, true, NULL);
                        if (ret) {
                                IWL_ERR(mvm, "failed to update quotas\n");
                                return;
                        }

                        if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART,
                                     &mvm->status)) {
                                /*
                                 * If we're restarting then the firmware will
                                 * obviously have lost synchronisation with
                                 * the AP. It will attempt to synchronise by
                                 * itself, but we can make it more reliable by
                                 * scheduling a session protection time event.
                                 *
                                 * The firmware needs to receive a beacon to
                                 * catch up with synchronisation, use 110% of
                                 * the beacon interval.
                                 *
                                 * Set a large maximum delay to allow for more
                                 * than a single interface.
                                 */
                                u32 dur = (11 * vif->bss_conf.beacon_int) / 10;
                                iwl_mvm_protect_session(mvm, vif, dur, dur,
                                                        5 * dur, false);
                        }

                        iwl_mvm_sf_update(mvm, vif, false);
                        iwl_mvm_power_vif_assoc(mvm, vif);
                        if (vif->p2p) {
                                iwl_mvm_ref(mvm, IWL_MVM_REF_P2P_CLIENT);
                                iwl_mvm_update_smps(mvm, vif,
                                                    IWL_MVM_SMPS_REQ_PROT,
                                                    IEEE80211_SMPS_DYNAMIC);
                        }
                } else if (mvmvif->ap_sta_id != IWL_MVM_INVALID_STA) {
                        /*
                         * If update fails - SF might be running in associated
                         * mode while disassociated - which is forbidden.
                         */
                        WARN_ONCE(iwl_mvm_sf_update(mvm, vif, false),
                                  "Failed to update SF upon disassociation\n");

                        /*
                         * If we get an assert during the connection (after the
                         * station has been added, but before the vif is set
                         * to associated), mac80211 will re-add the station and
                         * then configure the vif. Since the vif is not
                         * associated, we would remove the station here and
                         * this would fail the recovery.
                         */
                        if (!test_bit(IWL_MVM_STATUS_IN_HW_RESTART,
                                      &mvm->status)) {
                                /*
                                 * Remove AP station now that
                                 * the MAC is unassoc
                                 */
                                ret = iwl_mvm_rm_sta_id(mvm, vif,
                                                        mvmvif->ap_sta_id);
                                if (ret)
                                        IWL_ERR(mvm,
                                                "failed to remove AP station\n");

                                if (mvm->d0i3_ap_sta_id == mvmvif->ap_sta_id)
                                        mvm->d0i3_ap_sta_id =
                                                IWL_MVM_INVALID_STA;
                                mvmvif->ap_sta_id = IWL_MVM_INVALID_STA;
                        }

                        /* remove quota for this interface */
                        ret = iwl_mvm_update_quotas(mvm, false, NULL);
                        if (ret)
                                IWL_ERR(mvm, "failed to update quotas\n");

                        if (vif->p2p)
                                iwl_mvm_unref(mvm, IWL_MVM_REF_P2P_CLIENT);

                        /* this will take the cleared BSSID from bss_conf */
                        ret = iwl_mvm_mac_ctxt_changed(mvm, vif, false, NULL);
                        if (ret)
                                IWL_ERR(mvm,
                                        "failed to update MAC %pM (clear after unassoc)\n",
                                        vif->addr);
                }

                /*
                 * The firmware tracks the MU-MIMO group on its own.
                 * However, on HW restart we should restore this data.
                 */
                if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status) &&
                    (changes & BSS_CHANGED_MU_GROUPS) && vif->mu_mimo_owner) {
                        ret = iwl_mvm_update_mu_groups(mvm, vif);
                        if (ret)
                                IWL_ERR(mvm,
                                        "failed to update VHT MU_MIMO groups\n");
                }

                iwl_mvm_recalc_multicast(mvm);
                iwl_mvm_configure_bcast_filter(mvm);

                /* reset rssi values */
                mvmvif->bf_data.ave_beacon_signal = 0;

                iwl_mvm_bt_coex_vif_change(mvm);
                iwl_mvm_update_smps(mvm, vif, IWL_MVM_SMPS_REQ_TT,
                                    IEEE80211_SMPS_AUTOMATIC);
                if (fw_has_capa(&mvm->fw->ucode_capa,
                                IWL_UCODE_TLV_CAPA_UMAC_SCAN))
                        iwl_mvm_config_scan(mvm);
        }

        if (changes & BSS_CHANGED_BEACON_INFO) {
                /*
                 * We received a beacon from the associated AP so
                 * remove the session protection.
                 */
                iwl_mvm_stop_session_protection(mvm, vif);

                iwl_mvm_sf_update(mvm, vif, false);
                WARN_ON(iwl_mvm_enable_beacon_filter(mvm, vif, 0));
        }

        if (changes & (BSS_CHANGED_PS | BSS_CHANGED_P2P_PS | BSS_CHANGED_QOS |
                       /*
                        * Send power command on every beacon change,
                        * because we may have not enabled beacon abort yet.
                        */
                       BSS_CHANGED_BEACON_INFO)) {
                ret = iwl_mvm_power_update_mac(mvm);
                if (ret)
                        IWL_ERR(mvm, "failed to update power mode\n");
        }

        if (changes & BSS_CHANGED_TXPOWER) {
                IWL_DEBUG_CALIB(mvm, "Changing TX Power to %d\n",
                                bss_conf->txpower);
                iwl_mvm_set_tx_power(mvm, vif, bss_conf->txpower);
        }

        if (changes & BSS_CHANGED_CQM) {
                IWL_DEBUG_MAC80211(mvm, "cqm info_changed\n");
                /* reset cqm events tracking */
                mvmvif->bf_data.last_cqm_event = 0;
                if (mvmvif->bf_data.bf_enabled) {
                        ret = iwl_mvm_enable_beacon_filter(mvm, vif, 0);
                        if (ret)
                                IWL_ERR(mvm,
                                        "failed to update CQM thresholds\n");
                }
        }

        if (changes & BSS_CHANGED_ARP_FILTER) {
                IWL_DEBUG_MAC80211(mvm, "arp filter changed\n");
                iwl_mvm_configure_bcast_filter(mvm);
        }
}

static int iwl_mvm_start_ap_ibss(struct ieee80211_hw *hw,
                                 struct ieee80211_vif *vif)
{
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
        int ret;

        /*
         * iwl_mvm_mac_ctxt_add() might read directly from the device
         * (the system time), so make sure it is available.
         */
        ret = iwl_mvm_ref_sync(mvm, IWL_MVM_REF_START_AP);
        if (ret)
                return ret;

        mutex_lock(&mvm->mutex);

        /* Send the beacon template */
        ret = iwl_mvm_mac_ctxt_beacon_changed(mvm, vif);
        if (ret)
                goto out_unlock;

        /*
         * Re-calculate the tsf id, as the master-slave relations depend on the
         * beacon interval, which was not known when the AP interface was added.
         */
        if (vif->type == NL80211_IFTYPE_AP)
                iwl_mvm_mac_ctxt_recalc_tsf_id(mvm, vif);

        mvmvif->ap_assoc_sta_count = 0;

        /* Add the mac context */
        ret = iwl_mvm_mac_ctxt_add(mvm, vif);
        if (ret)
                goto out_unlock;

        /* Perform the binding */
        ret = iwl_mvm_binding_add_vif(mvm, vif);
        if (ret)
                goto out_remove;

        ret = iwl_mvm_add_mcast_sta(mvm, vif);
        if (ret)
                goto out_unbind;

        /* Send the bcast station. At this stage the TBTT and DTIM time events
         * are added and applied to the scheduler */
        ret = iwl_mvm_send_add_bcast_sta(mvm, vif);
        if (ret)
                goto out_rm_mcast;

        /* must be set before quota calculations */
        mvmvif->ap_ibss_active = true;

        /* power updated needs to be done before quotas */
        iwl_mvm_power_update_mac(mvm);

        ret = iwl_mvm_update_quotas(mvm, false, NULL);
        if (ret)
                goto out_quota_failed;

        /* Need to update the P2P Device MAC (only GO, IBSS is single vif) */
        if (vif->p2p && mvm->p2p_device_vif)
                iwl_mvm_mac_ctxt_changed(mvm, mvm->p2p_device_vif, false, NULL);

        iwl_mvm_ref(mvm, IWL_MVM_REF_AP_IBSS);

        iwl_mvm_bt_coex_vif_change(mvm);

        /* we don't support TDLS during DCM */
        if (iwl_mvm_phy_ctx_count(mvm) > 1)
                iwl_mvm_teardown_tdls_peers(mvm);

        goto out_unlock;

out_quota_failed:
        iwl_mvm_power_update_mac(mvm);
        mvmvif->ap_ibss_active = false;
        iwl_mvm_send_rm_bcast_sta(mvm, vif);
out_rm_mcast:
        iwl_mvm_rm_mcast_sta(mvm, vif);
out_unbind:
        iwl_mvm_binding_remove_vif(mvm, vif);
out_remove:
        iwl_mvm_mac_ctxt_remove(mvm, vif);
out_unlock:
        mutex_unlock(&mvm->mutex);
        iwl_mvm_unref(mvm, IWL_MVM_REF_START_AP);
        return ret;
}

static void iwl_mvm_stop_ap_ibss(struct ieee80211_hw *hw,
                                 struct ieee80211_vif *vif)
{
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);

        iwl_mvm_prepare_mac_removal(mvm, vif);

        mutex_lock(&mvm->mutex);

        /* Handle AP stop while in CSA */
        if (rcu_access_pointer(mvm->csa_vif) == vif) {
                iwl_mvm_remove_time_event(mvm, mvmvif,
                                          &mvmvif->time_event_data);
                RCU_INIT_POINTER(mvm->csa_vif, NULL);
                mvmvif->csa_countdown = false;
        }

        if (rcu_access_pointer(mvm->csa_tx_blocked_vif) == vif) {
                RCU_INIT_POINTER(mvm->csa_tx_blocked_vif, NULL);
                mvm->csa_tx_block_bcn_timeout = 0;
        }

        mvmvif->ap_ibss_active = false;
        mvm->ap_last_beacon_gp2 = 0;

        iwl_mvm_bt_coex_vif_change(mvm);

        iwl_mvm_unref(mvm, IWL_MVM_REF_AP_IBSS);

        /* Need to update the P2P Device MAC (only GO, IBSS is single vif) */
        if (vif->p2p && mvm->p2p_device_vif)
                iwl_mvm_mac_ctxt_changed(mvm, mvm->p2p_device_vif, false, NULL);

        iwl_mvm_update_quotas(mvm, false, NULL);

        /*
         * This is not very nice, but the simplest:
         * For older FWs removing the mcast sta before the bcast station may
         * cause assert 0x2b00.
         * This is fixed in later FW (which will stop beaconing when removing
         * bcast station).
         * So make the order of removal depend on the TLV
         */
        if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_STA_TYPE))
                iwl_mvm_rm_mcast_sta(mvm, vif);
        iwl_mvm_send_rm_bcast_sta(mvm, vif);
        if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_STA_TYPE))
                iwl_mvm_rm_mcast_sta(mvm, vif);
        iwl_mvm_binding_remove_vif(mvm, vif);

        iwl_mvm_power_update_mac(mvm);

        iwl_mvm_mac_ctxt_remove(mvm, vif);

        mutex_unlock(&mvm->mutex);
}

static void
iwl_mvm_bss_info_changed_ap_ibss(struct iwl_mvm *mvm,
                                 struct ieee80211_vif *vif,
                                 struct ieee80211_bss_conf *bss_conf,
                                 u32 changes)
{
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);

        /* Changes will be applied when the AP/IBSS is started */
        if (!mvmvif->ap_ibss_active)
                return;

        if (changes & (BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_HT |
                       BSS_CHANGED_BANDWIDTH | BSS_CHANGED_QOS) &&
            iwl_mvm_mac_ctxt_changed(mvm, vif, false, NULL))
                IWL_ERR(mvm, "failed to update MAC %pM\n", vif->addr);

        /* Need to send a new beacon template to the FW */
        if (changes & BSS_CHANGED_BEACON &&
            iwl_mvm_mac_ctxt_beacon_changed(mvm, vif))
                IWL_WARN(mvm, "Failed updating beacon data\n");

        if (changes & BSS_CHANGED_TXPOWER) {
                IWL_DEBUG_CALIB(mvm, "Changing TX Power to %d\n",
                                bss_conf->txpower);
                iwl_mvm_set_tx_power(mvm, vif, bss_conf->txpower);
        }
}

static void iwl_mvm_bss_info_changed(struct ieee80211_hw *hw,
                                     struct ieee80211_vif *vif,
                                     struct ieee80211_bss_conf *bss_conf,
                                     u32 changes)
{
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);

        /*
         * iwl_mvm_bss_info_changed_station() might call
         * iwl_mvm_protect_session(), which reads directly from
         * the device (the system time), so make sure it is available.
         */
        if (iwl_mvm_ref_sync(mvm, IWL_MVM_REF_BSS_CHANGED))
                return;

        mutex_lock(&mvm->mutex);

        if (changes & BSS_CHANGED_IDLE && !bss_conf->idle)
                iwl_mvm_scan_stop(mvm, IWL_MVM_SCAN_SCHED, true);

        switch (vif->type) {
        case NL80211_IFTYPE_STATION:
                iwl_mvm_bss_info_changed_station(mvm, vif, bss_conf, changes);
                break;
        case NL80211_IFTYPE_AP:
        case NL80211_IFTYPE_ADHOC:
                iwl_mvm_bss_info_changed_ap_ibss(mvm, vif, bss_conf, changes);
                break;
        case NL80211_IFTYPE_MONITOR:
                if (changes & BSS_CHANGED_MU_GROUPS)
                        iwl_mvm_update_mu_groups(mvm, vif);
                break;
        default:
                /* shouldn't happen */
                WARN_ON_ONCE(1);
        }

        mutex_unlock(&mvm->mutex);
        iwl_mvm_unref(mvm, IWL_MVM_REF_BSS_CHANGED);
}

static int iwl_mvm_mac_hw_scan(struct ieee80211_hw *hw,
                               struct ieee80211_vif *vif,
                               struct ieee80211_scan_request *hw_req)
{
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
        int ret;

        if (hw_req->req.n_channels == 0 ||
            hw_req->req.n_channels > mvm->fw->ucode_capa.n_scan_channels)
                return -EINVAL;

        mutex_lock(&mvm->mutex);
        ret = iwl_mvm_reg_scan_start(mvm, vif, &hw_req->req, &hw_req->ies);
        mutex_unlock(&mvm->mutex);

        return ret;
}

static void iwl_mvm_mac_cancel_hw_scan(struct ieee80211_hw *hw,
                                       struct ieee80211_vif *vif)
{
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);

        mutex_lock(&mvm->mutex);

        /* Due to a race condition, it's possible that mac80211 asks
         * us to stop a hw_scan when it's already stopped.  This can
         * happen, for instance, if we stopped the scan ourselves,
         * called ieee80211_scan_completed() and the userspace called
         * cancel scan scan before ieee80211_scan_work() could run.
         * To handle that, simply return if the scan is not running.
        */
        if (mvm->scan_status & IWL_MVM_SCAN_REGULAR)
                iwl_mvm_scan_stop(mvm, IWL_MVM_SCAN_REGULAR, true);

        mutex_unlock(&mvm->mutex);
}

static void
iwl_mvm_mac_allow_buffered_frames(struct ieee80211_hw *hw,
                                  struct ieee80211_sta *sta, u16 tids,
                                  int num_frames,
                                  enum ieee80211_frame_release_type reason,
                                  bool more_data)
{
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);

        /* Called when we need to transmit (a) frame(s) from mac80211 */

        iwl_mvm_sta_modify_sleep_tx_count(mvm, sta, reason, num_frames,
                                          tids, more_data, false);
}

static void
iwl_mvm_mac_release_buffered_frames(struct ieee80211_hw *hw,
                                    struct ieee80211_sta *sta, u16 tids,
                                    int num_frames,
                                    enum ieee80211_frame_release_type reason,
                                    bool more_data)
{
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);

        /* Called when we need to transmit (a) frame(s) from agg or dqa queue */

        iwl_mvm_sta_modify_sleep_tx_count(mvm, sta, reason, num_frames,
                                          tids, more_data, true);
}

static void __iwl_mvm_mac_sta_notify(struct ieee80211_hw *hw,
                                     enum sta_notify_cmd cmd,
                                     struct ieee80211_sta *sta)
{
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
        struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
        unsigned long txqs = 0, tids = 0;
        int tid;

        /*
         * If we have TVQM then we get too high queue numbers - luckily
         * we really shouldn't get here with that because such hardware
         * should have firmware supporting buffer station offload.
         */
        if (WARN_ON(iwl_mvm_has_new_tx_api(mvm)))
                return;

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

                if (tid_data->txq_id == IWL_MVM_INVALID_QUEUE)
                        continue;

                __set_bit(tid_data->txq_id, &txqs);

                if (iwl_mvm_tid_queued(mvm, tid_data) == 0)
                        continue;

                __set_bit(tid, &tids);
        }

        switch (cmd) {
        case STA_NOTIFY_SLEEP:
                for_each_set_bit(tid, &tids, IWL_MAX_TID_COUNT)
                        ieee80211_sta_set_buffered(sta, tid, true);

                if (txqs)
                        iwl_trans_freeze_txq_timer(mvm->trans, txqs, true);
                /*
                 * The fw updates the STA to be asleep. Tx packets on the Tx
                 * queues to this station will not be transmitted. The fw will
                 * send a Tx response with TX_STATUS_FAIL_DEST_PS.
                 */
                break;
        case STA_NOTIFY_AWAKE:
                if (WARN_ON(mvmsta->sta_id == IWL_MVM_INVALID_STA))
                        break;

                if (txqs)
                        iwl_trans_freeze_txq_timer(mvm->trans, txqs, false);
                iwl_mvm_sta_modify_ps_wake(mvm, sta);
                break;
        default:
                break;
        }
        spin_unlock_bh(&mvmsta->lock);
}

static void iwl_mvm_mac_sta_notify(struct ieee80211_hw *hw,
                                   struct ieee80211_vif *vif,
                                   enum sta_notify_cmd cmd,
                                   struct ieee80211_sta *sta)
{
        __iwl_mvm_mac_sta_notify(hw, cmd, sta);
}

void iwl_mvm_sta_pm_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
{
        struct iwl_rx_packet *pkt = rxb_addr(rxb);
        struct iwl_mvm_pm_state_notification *notif = (void *)pkt->data;
        struct ieee80211_sta *sta;
        struct iwl_mvm_sta *mvmsta;
        bool sleeping = (notif->type != IWL_MVM_PM_EVENT_AWAKE);

        if (WARN_ON(notif->sta_id >= ARRAY_SIZE(mvm->fw_id_to_mac_id)))
                return;

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

        mvmsta = iwl_mvm_sta_from_mac80211(sta);

        if (!mvmsta->vif ||
            mvmsta->vif->type != NL80211_IFTYPE_AP) {
                rcu_read_unlock();
                return;
        }

        if (mvmsta->sleeping != sleeping) {
                mvmsta->sleeping = sleeping;
                __iwl_mvm_mac_sta_notify(mvm->hw,
                        sleeping ? STA_NOTIFY_SLEEP : STA_NOTIFY_AWAKE,
                        sta);
                ieee80211_sta_ps_transition(sta, sleeping);
        }

        if (sleeping) {
                switch (notif->type) {
                case IWL_MVM_PM_EVENT_AWAKE:
                case IWL_MVM_PM_EVENT_ASLEEP:
                        break;
                case IWL_MVM_PM_EVENT_UAPSD:
                        ieee80211_sta_uapsd_trigger(sta, IEEE80211_NUM_TIDS);
                        break;
                case IWL_MVM_PM_EVENT_PS_POLL:
                        ieee80211_sta_pspoll(sta);
                        break;
                default:
                        break;
                }
        }

        rcu_read_unlock();
}

static void iwl_mvm_sta_pre_rcu_remove(struct ieee80211_hw *hw,
                                       struct ieee80211_vif *vif,
                                       struct ieee80211_sta *sta)
{
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
        struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);

        /*
         * This is called before mac80211 does RCU synchronisation,
         * so here we already invalidate our internal RCU-protected
         * station pointer. The rest of the code will thus no longer
         * be able to find the station this way, and we don't rely
         * on further RCU synchronisation after the sta_state()
         * callback deleted the station.
         */
        mutex_lock(&mvm->mutex);
        if (sta == rcu_access_pointer(mvm->fw_id_to_mac_id[mvm_sta->sta_id]))
                rcu_assign_pointer(mvm->fw_id_to_mac_id[mvm_sta->sta_id],
                                   ERR_PTR(-ENOENT));

        mutex_unlock(&mvm->mutex);
}

static void iwl_mvm_check_uapsd(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
                                const u8 *bssid)
{
        if (!(mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_UAPSD_SUPPORT))
                return;

        if (vif->p2p && !iwl_mvm_is_p2p_scm_uapsd_supported(mvm)) {
                vif->driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
                return;
        }

        if (!vif->p2p &&
            (iwlwifi_mod_params.uapsd_disable & IWL_DISABLE_UAPSD_BSS)) {
                vif->driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
                return;
        }

        vif->driver_flags |= IEEE80211_VIF_SUPPORTS_UAPSD;
}

static void
iwl_mvm_tdls_check_trigger(struct iwl_mvm *mvm,
                           struct ieee80211_vif *vif, u8 *peer_addr,
                           enum nl80211_tdls_operation action)
{
        struct iwl_fw_dbg_trigger_tlv *trig;
        struct iwl_fw_dbg_trigger_tdls *tdls_trig;

        if (!iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_TDLS))
                return;

        trig = iwl_fw_dbg_get_trigger(mvm->fw, FW_DBG_TRIGGER_TDLS);
        tdls_trig = (void *)trig->data;
        if (!iwl_fw_dbg_trigger_check_stop(&mvm->fwrt,
                                           ieee80211_vif_to_wdev(vif), trig))
                return;

        if (!(tdls_trig->action_bitmap & BIT(action)))
                return;

        if (tdls_trig->peer_mode &&
            memcmp(tdls_trig->peer, peer_addr, ETH_ALEN) != 0)
                return;

        iwl_fw_dbg_collect_trig(&mvm->fwrt, trig,
                                "TDLS event occurred, peer %pM, action %d",
                                peer_addr, action);
}

static void iwl_mvm_purge_deferred_tx_frames(struct iwl_mvm *mvm,
                                             struct iwl_mvm_sta *mvm_sta)
{
        struct iwl_mvm_tid_data *tid_data;
        struct sk_buff *skb;
        int i;

        spin_lock_bh(&mvm_sta->lock);
        for (i = 0; i <= IWL_MAX_TID_COUNT; i++) {
                tid_data = &mvm_sta->tid_data[i];

                while ((skb = __skb_dequeue(&tid_data->deferred_tx_frames))) {
                        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

                        /*
                         * The first deferred frame should've stopped the MAC
                         * queues, so we should never get a second deferred
                         * frame for the RA/TID.
                         */
                        iwl_mvm_start_mac_queues(mvm, BIT(info->hw_queue));
                        ieee80211_free_txskb(mvm->hw, skb);
                }
        }
        spin_unlock_bh(&mvm_sta->lock);
}

static int iwl_mvm_mac_sta_state(struct ieee80211_hw *hw,
                                 struct ieee80211_vif *vif,
                                 struct ieee80211_sta *sta,
                                 enum ieee80211_sta_state old_state,
                                 enum ieee80211_sta_state new_state)
{
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
        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;

        IWL_DEBUG_MAC80211(mvm, "station %pM state change %d->%d\n",
                           sta->addr, old_state, new_state);

        /* this would be a mac80211 bug ... but don't crash */
        if (WARN_ON_ONCE(!mvmvif->phy_ctxt))
                return -EINVAL;

        /*
         * If we are in a STA removal flow and in DQA mode:
         *
         * This is after the sync_rcu part, so the queues have already been
         * flushed. No more TXs on their way in mac80211's path, and no more in
         * the queues.
         * Also, we won't be getting any new TX frames for this station.
         * What we might have are deferred TX frames that need to be taken care
         * of.
         *
         * Drop any still-queued deferred-frame before removing the STA, and
         * make sure the worker is no longer handling frames for this STA.
         */
        if (old_state == IEEE80211_STA_NONE &&
            new_state == IEEE80211_STA_NOTEXIST) {
                iwl_mvm_purge_deferred_tx_frames(mvm, mvm_sta);
                flush_work(&mvm->add_stream_wk);

                /*
                 * No need to make sure deferred TX indication is off since the
                 * worker will already remove it if it was on
                 */
        }

        mutex_lock(&mvm->mutex);
        /* track whether or not the station is associated */
        mvm_sta->associated = new_state >= IEEE80211_STA_ASSOC;

        if (old_state == IEEE80211_STA_NOTEXIST &&
            new_state == IEEE80211_STA_NONE) {
                /*
                 * Firmware bug - it'll crash if the beacon interval is less
                 * than 16. We can't avoid connecting at all, so refuse the
                 * station state change, this will cause mac80211 to abandon
                 * attempts to connect to this AP, and eventually wpa_s will
                 * blacklist the AP...
                 */
                if (vif->type == NL80211_IFTYPE_STATION &&
                    vif->bss_conf.beacon_int < 16) {
                        IWL_ERR(mvm,
                                "AP %pM beacon interval is %d, refusing due to firmware bug!\n",
                                sta->addr, vif->bss_conf.beacon_int);
                        ret = -EINVAL;
                        goto out_unlock;
                }

                if (sta->tdls &&
                    (vif->p2p ||
                     iwl_mvm_tdls_sta_count(mvm, NULL) ==
                                                IWL_MVM_TDLS_STA_COUNT ||
                     iwl_mvm_phy_ctx_count(mvm) > 1)) {
                        IWL_DEBUG_MAC80211(mvm, "refusing TDLS sta\n");
                        ret = -EBUSY;
                        goto out_unlock;
                }

                ret = iwl_mvm_add_sta(mvm, vif, sta);
                if (sta->tdls && ret == 0) {
                        iwl_mvm_recalc_tdls_state(mvm, vif, true);
                        iwl_mvm_tdls_check_trigger(mvm, vif, sta->addr,
                                                   NL80211_TDLS_SETUP);
                }
        } else if (old_state == IEEE80211_STA_NONE &&
                   new_state == IEEE80211_STA_AUTH) {
                /*
                 * EBS may be disabled due to previous failures reported by FW.
                 * Reset EBS status here assuming environment has been changed.
                 */
                mvm->last_ebs_successful = true;
                iwl_mvm_check_uapsd(mvm, vif, sta->addr);
                ret = 0;
        } else if (old_state == IEEE80211_STA_AUTH &&
                   new_state == IEEE80211_STA_ASSOC) {
                if (vif->type == NL80211_IFTYPE_AP) {
                        mvmvif->ap_assoc_sta_count++;
                        iwl_mvm_mac_ctxt_changed(mvm, vif, false, NULL);
                }

                iwl_mvm_rs_rate_init(mvm, sta, mvmvif->phy_ctxt->channel->band,
                                     true);
                ret = iwl_mvm_update_sta(mvm, vif, sta);
        } else if (old_state == IEEE80211_STA_ASSOC &&
                   new_state == IEEE80211_STA_AUTHORIZED) {

                /* we don't support TDLS during DCM */
                if (iwl_mvm_phy_ctx_count(mvm) > 1)
                        iwl_mvm_teardown_tdls_peers(mvm);

                if (sta->tdls)
                        iwl_mvm_tdls_check_trigger(mvm, vif, sta->addr,
                                                   NL80211_TDLS_ENABLE_LINK);

                /* enable beacon filtering */
                WARN_ON(iwl_mvm_enable_beacon_filter(mvm, vif, 0));
                ret = 0;
        } else if (old_state == IEEE80211_STA_AUTHORIZED &&
                   new_state == IEEE80211_STA_ASSOC) {
                /* disable beacon filtering */
                WARN_ON(iwl_mvm_disable_beacon_filter(mvm, vif, 0));
                ret = 0;
        } else if (old_state == IEEE80211_STA_ASSOC &&
                   new_state == IEEE80211_STA_AUTH) {
                if (vif->type == NL80211_IFTYPE_AP) {
                        mvmvif->ap_assoc_sta_count--;
                        iwl_mvm_mac_ctxt_changed(mvm, vif, false, NULL);
                }
                ret = 0;
        } else if (old_state == IEEE80211_STA_AUTH &&
                   new_state == IEEE80211_STA_NONE) {
                ret = 0;
        } else if (old_state == IEEE80211_STA_NONE &&
                   new_state == IEEE80211_STA_NOTEXIST) {
                ret = iwl_mvm_rm_sta(mvm, vif, sta);
                if (sta->tdls) {
                        iwl_mvm_recalc_tdls_state(mvm, vif, false);
                        iwl_mvm_tdls_check_trigger(mvm, vif, sta->addr,
                                                   NL80211_TDLS_DISABLE_LINK);
                }
        } else {
                ret = -EIO;
        }
 out_unlock:
        mutex_unlock(&mvm->mutex);

        if (sta->tdls && ret == 0) {
                if (old_state == IEEE80211_STA_NOTEXIST &&
                    new_state == IEEE80211_STA_NONE)
                        ieee80211_reserve_tid(sta, IWL_MVM_TDLS_FW_TID);
                else if (old_state == IEEE80211_STA_NONE &&
                         new_state == IEEE80211_STA_NOTEXIST)
                        ieee80211_unreserve_tid(sta, IWL_MVM_TDLS_FW_TID);
        }

        return ret;
}

static int iwl_mvm_mac_set_rts_threshold(struct ieee80211_hw *hw, u32 value)
{
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);

        mvm->rts_threshold = value;

        return 0;
}

static void iwl_mvm_sta_rc_update(struct ieee80211_hw *hw,
                                  struct ieee80211_vif *vif,
                                  struct ieee80211_sta *sta, u32 changed)
{
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);

        if (vif->type == NL80211_IFTYPE_STATION &&
            changed & IEEE80211_RC_NSS_CHANGED)
                iwl_mvm_sf_update(mvm, vif, false);
}

static int iwl_mvm_mac_conf_tx(struct ieee80211_hw *hw,
                               struct ieee80211_vif *vif, u16 ac,
                               const struct ieee80211_tx_queue_params *params)
{
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);

        mvmvif->queue_params[ac] = *params;

        /*
         * No need to update right away, we'll get BSS_CHANGED_QOS
         * The exception is P2P_DEVICE interface which needs immediate update.
         */
        if (vif->type == NL80211_IFTYPE_P2P_DEVICE) {
                int ret;

                mutex_lock(&mvm->mutex);
                ret = iwl_mvm_mac_ctxt_changed(mvm, vif, false, NULL);
                mutex_unlock(&mvm->mutex);
                return ret;
        }
        return 0;
}

static void iwl_mvm_mac_mgd_prepare_tx(struct ieee80211_hw *hw,
                                      struct ieee80211_vif *vif)
{
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
        u32 duration = IWL_MVM_TE_SESSION_PROTECTION_MAX_TIME_MS;
        u32 min_duration = IWL_MVM_TE_SESSION_PROTECTION_MIN_TIME_MS;

        if (WARN_ON_ONCE(vif->bss_conf.assoc))
                return;

        /*
         * iwl_mvm_protect_session() reads directly from the device
         * (the system time), so make sure it is available.
         */
        if (iwl_mvm_ref_sync(mvm, IWL_MVM_REF_PREPARE_TX))
                return;

        mutex_lock(&mvm->mutex);
        /* Try really hard to protect the session and hear a beacon */
        iwl_mvm_protect_session(mvm, vif, duration, min_duration, 500, false);
        mutex_unlock(&mvm->mutex);

        iwl_mvm_unref(mvm, IWL_MVM_REF_PREPARE_TX);
}

static int iwl_mvm_mac_sched_scan_start(struct ieee80211_hw *hw,
                                        struct ieee80211_vif *vif,
                                        struct cfg80211_sched_scan_request *req,
                                        struct ieee80211_scan_ies *ies)
{
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);

        int ret;

        mutex_lock(&mvm->mutex);

        if (!vif->bss_conf.idle) {
                ret = -EBUSY;
                goto out;
        }

        ret = iwl_mvm_sched_scan_start(mvm, vif, req, ies, IWL_MVM_SCAN_SCHED);

out:
        mutex_unlock(&mvm->mutex);
        return ret;
}

static int iwl_mvm_mac_sched_scan_stop(struct ieee80211_hw *hw,
                                       struct ieee80211_vif *vif)
{
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
        int ret;

        mutex_lock(&mvm->mutex);

        /* Due to a race condition, it's possible that mac80211 asks
         * us to stop a sched_scan when it's already stopped.  This
         * can happen, for instance, if we stopped the scan ourselves,
         * called ieee80211_sched_scan_stopped() and the userspace called
         * stop sched scan scan before ieee80211_sched_scan_stopped_work()
         * could run.  To handle this, simply return if the scan is
         * not running.
        */
        if (!(mvm->scan_status & IWL_MVM_SCAN_SCHED)) {
                mutex_unlock(&mvm->mutex);
                return 0;
        }

        ret = iwl_mvm_scan_stop(mvm, IWL_MVM_SCAN_SCHED, false);
        mutex_unlock(&mvm->mutex);
        iwl_mvm_wait_for_async_handlers(mvm);

        return ret;
}

static int iwl_mvm_mac_set_key(struct ieee80211_hw *hw,
                               enum set_key_cmd cmd,
                               struct ieee80211_vif *vif,
                               struct ieee80211_sta *sta,
                               struct ieee80211_key_conf *key)
{
        struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
        struct iwl_mvm_sta *mvmsta;
        struct iwl_mvm_key_pn *ptk_pn;
        int keyidx = key->keyidx;
        int ret;
        u8 key_offset;

        if (iwlwifi_mod_params.swcrypto) {
                IWL_DEBUG_MAC80211(mvm, "leave - hwcrypto disabled\n");
                return -EOPNOTSUPP;
        }

        switch (key->cipher) {
        case WLAN_CIPHER_SUITE_TKIP:
                key->flags |= IEEE80211_KEY_FLAG_GENERATE_MMIC;
                key->flags |= IEEE80211_KEY_FLAG_PUT_IV_SPACE;
                break;
        case WLAN_CIPHER_SUITE_CCMP:
        case WLAN_CIPHER_SUITE_GCMP:
        case WLAN_CIPHER_SUITE_GCMP_256:
                if (!iwl_mvm_has_new_tx_api(mvm))
                        key->flags |= IEEE80211_KEY_FLAG_PUT_IV_SPACE;
                break;
        case WLAN_CIPHER_SUITE_AES_CMAC:
        case WLAN_CIPHER_SUITE_BIP_GMAC_128:
        case WLAN_CIPHER_SUITE_BIP_GMAC_256:
                WARN_ON_ONCE(!ieee80211_hw_check(hw, MFP_CAPABLE));
                break;
        case WLAN_CIPHER_SUITE_WEP40:
        case WLAN_CIPHER_SUITE_WEP104:
                /* For non-client mode, only use WEP keys for TX as we probably
                 * don't have a station yet anyway and would then have to keep
                 * track of the keys, linking them to each of the clients/peers
                 * as they appear. For now, don't do that, for performance WEP
                 * offload doesn't really matter much, but we need it for some
                 * other offload features in client mode.
                 */
                if (vif->type != NL80211_IFTYPE_STATION)
                        return 0;
                break;
        default:
                /* currently FW supports only one optional cipher scheme */
                if (hw->n_cipher_schemes &&
                    hw->cipher_schemes->cipher == key->cipher)
                        key->flags |= IEEE80211_KEY_FLAG_PUT_IV_SPACE;
                else
                        return -EOPNOTSUPP;
        }

        mutex_lock(&mvm->mutex);

        switch (cmd) {
        case SET_KEY:
                if ((vif->type == NL80211_IFTYPE_ADHOC ||
                     vif->type == NL80211_IFTYPE_AP) && !sta) {
                        /*
                         * GTK on AP interface is a TX-only key, return 0;
                         * on IBSS they're per-station and because we're lazy
                         * we don't support them for RX, so do the same.
                         * CMAC/GMAC in AP/IBSS modes must be done in software.
                         */
                        if (key->cipher == WLAN_CIPHER_SUITE_AES_CMAC ||
                            key->cipher == WLAN_CIPHER_SUITE_BIP_GMAC_128 ||
                            key->cipher == WLAN_CIPHER_SUITE_BIP_GMAC_256)
                                ret = -EOPNOTSUPP;
                        else
                                ret = 0;

                        if (key->cipher != WLAN_CIPHER_SUITE_GCMP &&
                            key->cipher != WLAN_CIPHER_SUITE_GCMP_256 &&
                            !iwl_mvm_has_new_tx_api(mvm)) {
                                key->hw_key_idx = STA_KEY_IDX_INVALID;
                                break;
                        }
                }

                /* During FW restart, in order to restore the state as it was,
                 * don't try to reprogram keys we previously failed for.
                 */
                if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status) &&
                    key->hw_key_idx == STA_KEY_IDX_INVALID) {
                        IWL_DEBUG_MAC80211(mvm,
                                           "skip invalid idx key programming during restart\n");
                        ret = 0;
                        break;
                }

                if (!test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status) &&
                    sta && iwl_mvm_has_new_rx_api(mvm) &&
                    key->flags & IEEE80211_KEY_FLAG_PAIRWISE &&
                    (key->cipher == WLAN_CIPHER_SUITE_CCMP ||
                     key->cipher == WLAN_CIPHER_SUITE_GCMP ||
                     key->cipher == WLAN_CIPHER_SUITE_GCMP_256)) {
                        struct ieee80211_key_seq seq;
                        int tid, q;

                        mvmsta = iwl_mvm_sta_from_mac80211(sta);
                        WARN_ON(rcu_access_pointer(mvmsta->ptk_pn[keyidx]));
                        ptk_pn = kzalloc(sizeof(*ptk_pn) +
                                         mvm->trans->num_rx_queues *
                                                sizeof(ptk_pn->q[0]),
                                         GFP_KERNEL);
                        if (!ptk_pn) {
                                ret = -ENOMEM;
                                break;
                        }

                        for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++) {
                                ieee80211_get_key_rx_seq(key, tid, &seq);
                                for (q = 0; q < mvm->trans->num_rx_queues; q++)
                                        memcpy(ptk_pn->q[q].pn[tid],
                                               seq.ccmp.pn,
                                               IEEE80211_CCMP_PN_LEN);
                        }

                        rcu_assign_pointer(mvmsta->ptk_pn[keyidx], ptk_pn);
                }

                /* in HW restart reuse the index, otherwise request a new one */
                if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status))
                        key_offset = key->hw_key_idx;
                else
                        key_offset = STA_KEY_IDX_INVALID;

                IWL_DEBUG_MAC80211(mvm, "set hwcrypto key\n");
                ret = iwl_mvm_set_sta_key(mvm, vif, sta, key, key_offset);