// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
 * Copyright (C) 2012-2014, 2018-2020 Intel Corporation
 * Copyright (C) 2013-2015 Intel Mobile Communications GmbH
 * Copyright (C) 2016-2017 Intel Deutschland GmbH
 */
#include <linux/etherdevice.h>
#include <net/mac80211.h>
#include <linux/crc32.h>

#include "mvm.h"
#include "fw/api/scan.h"
#include "iwl-io.h"

#define IWL_DENSE_EBS_SCAN_RATIO 5
#define IWL_SPARSE_EBS_SCAN_RATIO 1

#define IWL_SCAN_DWELL_ACTIVE           10
#define IWL_SCAN_DWELL_PASSIVE          110
#define IWL_SCAN_DWELL_FRAGMENTED       44
#define IWL_SCAN_DWELL_EXTENDED         90
#define IWL_SCAN_NUM_OF_FRAGS           3
#define IWL_SCAN_LAST_2_4_CHN           14

/* adaptive dwell max budget time [TU] for full scan */
#define IWL_SCAN_ADWELL_MAX_BUDGET_FULL_SCAN 300
/* adaptive dwell max budget time [TU] for directed scan */
#define IWL_SCAN_ADWELL_MAX_BUDGET_DIRECTED_SCAN 100
/* adaptive dwell default high band APs number */
#define IWL_SCAN_ADWELL_DEFAULT_HB_N_APS 8
/* adaptive dwell default low band APs number */
#define IWL_SCAN_ADWELL_DEFAULT_LB_N_APS 2
/* adaptive dwell default APs number in social channels (1, 6, 11) */
#define IWL_SCAN_ADWELL_DEFAULT_N_APS_SOCIAL 10
/* number of scan channels */
#define IWL_SCAN_NUM_CHANNELS 112
/* adaptive dwell number of APs override mask for p2p friendly GO */
#define IWL_SCAN_ADWELL_N_APS_GO_FRIENDLY_BIT BIT(20)
/* adaptive dwell number of APs override mask for social channels */
#define IWL_SCAN_ADWELL_N_APS_SOCIAL_CHS_BIT BIT(21)
/* adaptive dwell number of APs override for p2p friendly GO channels */
#define IWL_SCAN_ADWELL_N_APS_GO_FRIENDLY 10
/* adaptive dwell number of APs override for social channels */
#define IWL_SCAN_ADWELL_N_APS_SOCIAL_CHS 2

struct iwl_mvm_scan_timing_params {
        u32 suspend_time;
        u32 max_out_time;
};

static struct iwl_mvm_scan_timing_params scan_timing[] = {
        [IWL_SCAN_TYPE_UNASSOC] = {
                .suspend_time = 0,
                .max_out_time = 0,
        },
        [IWL_SCAN_TYPE_WILD] = {
                .suspend_time = 30,
                .max_out_time = 120,
        },
        [IWL_SCAN_TYPE_MILD] = {
                .suspend_time = 120,
                .max_out_time = 120,
        },
        [IWL_SCAN_TYPE_FRAGMENTED] = {
                .suspend_time = 95,
                .max_out_time = 44,
        },
        [IWL_SCAN_TYPE_FAST_BALANCE] = {
                .suspend_time = 30,
                .max_out_time = 37,
        },
};

struct iwl_mvm_scan_params {
        /* For CDB this is low band scan type, for non-CDB - type. */
        enum iwl_mvm_scan_type type;
        enum iwl_mvm_scan_type hb_type;
        u32 n_channels;
        u16 delay;
        int n_ssids;
        struct cfg80211_ssid *ssids;
        struct ieee80211_channel **channels;
        u32 flags;
        u8 *mac_addr;
        u8 *mac_addr_mask;
        bool no_cck;
        bool pass_all;
        int n_match_sets;
        struct iwl_scan_probe_req preq;
        struct cfg80211_match_set *match_sets;
        int n_scan_plans;
        struct cfg80211_sched_scan_plan *scan_plans;
        bool iter_notif;
        struct cfg80211_scan_6ghz_params *scan_6ghz_params;
        u32 n_6ghz_params;
        bool scan_6ghz;
};

static inline void *iwl_mvm_get_scan_req_umac_data(struct iwl_mvm *mvm)
{
        struct iwl_scan_req_umac *cmd = mvm->scan_cmd;

        if (iwl_mvm_is_adaptive_dwell_v2_supported(mvm))
                return (void *)&cmd->v8.data;

        if (iwl_mvm_is_adaptive_dwell_supported(mvm))
                return (void *)&cmd->v7.data;

        if (iwl_mvm_cdb_scan_api(mvm))
                return (void *)&cmd->v6.data;

        return (void *)&cmd->v1.data;
}

static inline struct iwl_scan_umac_chan_param *
iwl_mvm_get_scan_req_umac_channel(struct iwl_mvm *mvm)
{
        struct iwl_scan_req_umac *cmd = mvm->scan_cmd;

        if (iwl_mvm_is_adaptive_dwell_v2_supported(mvm))
                return &cmd->v8.channel;

        if (iwl_mvm_is_adaptive_dwell_supported(mvm))
                return &cmd->v7.channel;

        if (iwl_mvm_cdb_scan_api(mvm))
                return &cmd->v6.channel;

        return &cmd->v1.channel;
}

static u8 iwl_mvm_scan_rx_ant(struct iwl_mvm *mvm)
{
        if (mvm->scan_rx_ant != ANT_NONE)
                return mvm->scan_rx_ant;
        return iwl_mvm_get_valid_rx_ant(mvm);
}

static inline __le16 iwl_mvm_scan_rx_chain(struct iwl_mvm *mvm)
{
        u16 rx_chain;
        u8 rx_ant;

        rx_ant = iwl_mvm_scan_rx_ant(mvm);
        rx_chain = rx_ant << PHY_RX_CHAIN_VALID_POS;
        rx_chain |= rx_ant << PHY_RX_CHAIN_FORCE_MIMO_SEL_POS;
        rx_chain |= rx_ant << PHY_RX_CHAIN_FORCE_SEL_POS;
        rx_chain |= 0x1 << PHY_RX_CHAIN_DRIVER_FORCE_POS;
        return cpu_to_le16(rx_chain);
}

static inline __le32
iwl_mvm_scan_rate_n_flags(struct iwl_mvm *mvm, enum nl80211_band band,
                          bool no_cck)
{
        u32 tx_ant;

        iwl_mvm_toggle_tx_ant(mvm, &mvm->scan_last_antenna_idx);
        tx_ant = BIT(mvm->scan_last_antenna_idx) << RATE_MCS_ANT_POS;

        if (band == NL80211_BAND_2GHZ && !no_cck)
                return cpu_to_le32(IWL_RATE_1M_PLCP | RATE_MCS_CCK_MSK |
                                   tx_ant);
        else
                return cpu_to_le32(IWL_RATE_6M_PLCP | tx_ant);
}

static void iwl_mvm_scan_condition_iterator(void *data, u8 *mac,
                                            struct ieee80211_vif *vif)
{
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
        int *global_cnt = data;

        if (vif->type != NL80211_IFTYPE_P2P_DEVICE && mvmvif->phy_ctxt &&
            mvmvif->phy_ctxt->id < NUM_PHY_CTX)
                *global_cnt += 1;
}

static enum iwl_mvm_traffic_load iwl_mvm_get_traffic_load(struct iwl_mvm *mvm)
{
        return mvm->tcm.result.global_load;
}

static enum iwl_mvm_traffic_load
iwl_mvm_get_traffic_load_band(struct iwl_mvm *mvm, enum nl80211_band band)
{
        return mvm->tcm.result.band_load[band];
}

struct iwl_is_dcm_with_go_iterator_data {
        struct ieee80211_vif *current_vif;
        bool is_dcm_with_p2p_go;
};

static void iwl_mvm_is_dcm_with_go_iterator(void *_data, u8 *mac,
                                            struct ieee80211_vif *vif)
{
        struct iwl_is_dcm_with_go_iterator_data *data = _data;
        struct iwl_mvm_vif *other_mvmvif = iwl_mvm_vif_from_mac80211(vif);
        struct iwl_mvm_vif *curr_mvmvif =
                iwl_mvm_vif_from_mac80211(data->current_vif);

        /* exclude the given vif */
        if (vif == data->current_vif)
                return;

        if (vif->type == NL80211_IFTYPE_AP && vif->p2p &&
            other_mvmvif->phy_ctxt && curr_mvmvif->phy_ctxt &&
            other_mvmvif->phy_ctxt->id != curr_mvmvif->phy_ctxt->id)
                data->is_dcm_with_p2p_go = true;
}

static enum
iwl_mvm_scan_type _iwl_mvm_get_scan_type(struct iwl_mvm *mvm,
                                         struct ieee80211_vif *vif,
                                         enum iwl_mvm_traffic_load load,
                                         bool low_latency)
{
        int global_cnt = 0;

        ieee80211_iterate_active_interfaces_atomic(mvm->hw,
                                            IEEE80211_IFACE_ITER_NORMAL,
                                            iwl_mvm_scan_condition_iterator,
                                            &global_cnt);
        if (!global_cnt)
                return IWL_SCAN_TYPE_UNASSOC;

        if (fw_has_api(&mvm->fw->ucode_capa,
                       IWL_UCODE_TLV_API_FRAGMENTED_SCAN)) {
                if ((load == IWL_MVM_TRAFFIC_HIGH || low_latency) &&
                    (!vif || vif->type != NL80211_IFTYPE_P2P_DEVICE))
                        return IWL_SCAN_TYPE_FRAGMENTED;

                /* in case of DCM with GO where BSS DTIM interval < 220msec
                 * set all scan requests as fast-balance scan
                 * */
                if (vif && vif->type == NL80211_IFTYPE_STATION &&
                    vif->bss_conf.dtim_period < 220) {
                        struct iwl_is_dcm_with_go_iterator_data data = {
                                .current_vif = vif,
                                .is_dcm_with_p2p_go = false,
                        };

                        ieee80211_iterate_active_interfaces_atomic(mvm->hw,
                                                IEEE80211_IFACE_ITER_NORMAL,
                                                iwl_mvm_is_dcm_with_go_iterator,
                                                &data);
                        if (data.is_dcm_with_p2p_go)
                                return IWL_SCAN_TYPE_FAST_BALANCE;
                }
        }

        if (load >= IWL_MVM_TRAFFIC_MEDIUM || low_latency)
                return IWL_SCAN_TYPE_MILD;

        return IWL_SCAN_TYPE_WILD;
}

static enum
iwl_mvm_scan_type iwl_mvm_get_scan_type(struct iwl_mvm *mvm,
                                        struct ieee80211_vif *vif)
{
        enum iwl_mvm_traffic_load load;
        bool low_latency;

        load = iwl_mvm_get_traffic_load(mvm);
        low_latency = iwl_mvm_low_latency(mvm);

        return _iwl_mvm_get_scan_type(mvm, vif, load, low_latency);
}

static enum
iwl_mvm_scan_type iwl_mvm_get_scan_type_band(struct iwl_mvm *mvm,
                                             struct ieee80211_vif *vif,
                                             enum nl80211_band band)
{
        enum iwl_mvm_traffic_load load;
        bool low_latency;

        load = iwl_mvm_get_traffic_load_band(mvm, band);
        low_latency = iwl_mvm_low_latency_band(mvm, band);

        return _iwl_mvm_get_scan_type(mvm, vif, load, low_latency);
}

static inline bool iwl_mvm_rrm_scan_needed(struct iwl_mvm *mvm)
{
        /* require rrm scan whenever the fw supports it */
        return fw_has_capa(&mvm->fw->ucode_capa,
                           IWL_UCODE_TLV_CAPA_DS_PARAM_SET_IE_SUPPORT);
}

static int iwl_mvm_max_scan_ie_fw_cmd_room(struct iwl_mvm *mvm)
{
        int max_probe_len;

        max_probe_len = SCAN_OFFLOAD_PROBE_REQ_SIZE;

        /* we create the 802.11 header and SSID element */
        max_probe_len -= 24 + 2;

        /* DS parameter set element is added on 2.4GHZ band if required */
        if (iwl_mvm_rrm_scan_needed(mvm))
                max_probe_len -= 3;

        return max_probe_len;
}

int iwl_mvm_max_scan_ie_len(struct iwl_mvm *mvm)
{
        int max_ie_len = iwl_mvm_max_scan_ie_fw_cmd_room(mvm);

        /* TODO: [BUG] This function should return the maximum allowed size of
         * scan IEs, however the LMAC scan api contains both 2GHZ and 5GHZ IEs
         * in the same command. So the correct implementation of this function
         * is just iwl_mvm_max_scan_ie_fw_cmd_room() / 2. Currently the scan
         * command has only 512 bytes and it would leave us with about 240
         * bytes for scan IEs, which is clearly not enough. So meanwhile
         * we will report an incorrect value. This may result in a failure to
         * issue a scan in unified_scan_lmac and unified_sched_scan_lmac
         * functions with -ENOBUFS, if a large enough probe will be provided.
         */
        return max_ie_len;
}

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

        IWL_DEBUG_SCAN(mvm,
                       "Scan offload iteration complete: status=0x%x scanned channels=%d\n",
                       notif->status, notif->scanned_channels);

        if (mvm->sched_scan_pass_all == SCHED_SCAN_PASS_ALL_FOUND) {
                IWL_DEBUG_SCAN(mvm, "Pass all scheduled scan results found\n");
                ieee80211_sched_scan_results(mvm->hw);
                mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_ENABLED;
        }
}

void iwl_mvm_rx_scan_match_found(struct iwl_mvm *mvm,
                                 struct iwl_rx_cmd_buffer *rxb)
{
        IWL_DEBUG_SCAN(mvm, "Scheduled scan results\n");
        ieee80211_sched_scan_results(mvm->hw);
}

static const char *iwl_mvm_ebs_status_str(enum iwl_scan_ebs_status status)
{
        switch (status) {
        case IWL_SCAN_EBS_SUCCESS:
                return "successful";
        case IWL_SCAN_EBS_INACTIVE:
                return "inactive";
        case IWL_SCAN_EBS_FAILED:
        case IWL_SCAN_EBS_CHAN_NOT_FOUND:
        default:
                return "failed";
        }
}

void iwl_mvm_rx_lmac_scan_complete_notif(struct iwl_mvm *mvm,
                                         struct iwl_rx_cmd_buffer *rxb)
{
        struct iwl_rx_packet *pkt = rxb_addr(rxb);
        struct iwl_periodic_scan_complete *scan_notif = (void *)pkt->data;
        bool aborted = (scan_notif->status == IWL_SCAN_OFFLOAD_ABORTED);

        /* If this happens, the firmware has mistakenly sent an LMAC
         * notification during UMAC scans -- warn and ignore it.
         */
        if (WARN_ON_ONCE(fw_has_capa(&mvm->fw->ucode_capa,
                                     IWL_UCODE_TLV_CAPA_UMAC_SCAN)))
                return;

        /* scan status must be locked for proper checking */
        lockdep_assert_held(&mvm->mutex);

        /* We first check if we were stopping a scan, in which case we
         * just clear the stopping flag.  Then we check if it was a
         * firmware initiated stop, in which case we need to inform
         * mac80211.
         * Note that we can have a stopping and a running scan
         * simultaneously, but we can't have two different types of
         * scans stopping or running at the same time (since LMAC
         * doesn't support it).
         */

        if (mvm->scan_status & IWL_MVM_SCAN_STOPPING_SCHED) {
                WARN_ON_ONCE(mvm->scan_status & IWL_MVM_SCAN_STOPPING_REGULAR);

                IWL_DEBUG_SCAN(mvm, "Scheduled scan %s, EBS status %s\n",
                               aborted ? "aborted" : "completed",
                               iwl_mvm_ebs_status_str(scan_notif->ebs_status));
                IWL_DEBUG_SCAN(mvm,
                               "Last line %d, Last iteration %d, Time after last iteration %d\n",
                               scan_notif->last_schedule_line,
                               scan_notif->last_schedule_iteration,
                               __le32_to_cpu(scan_notif->time_after_last_iter));

                mvm->scan_status &= ~IWL_MVM_SCAN_STOPPING_SCHED;
        } else if (mvm->scan_status & IWL_MVM_SCAN_STOPPING_REGULAR) {
                IWL_DEBUG_SCAN(mvm, "Regular scan %s, EBS status %s\n",
                               aborted ? "aborted" : "completed",
                               iwl_mvm_ebs_status_str(scan_notif->ebs_status));

                mvm->scan_status &= ~IWL_MVM_SCAN_STOPPING_REGULAR;
        } else if (mvm->scan_status & IWL_MVM_SCAN_SCHED) {
                WARN_ON_ONCE(mvm->scan_status & IWL_MVM_SCAN_REGULAR);

                IWL_DEBUG_SCAN(mvm, "Scheduled scan %s, EBS status %s\n",
                               aborted ? "aborted" : "completed",
                               iwl_mvm_ebs_status_str(scan_notif->ebs_status));
                IWL_DEBUG_SCAN(mvm,
                               "Last line %d, Last iteration %d, Time after last iteration %d (FW)\n",
                               scan_notif->last_schedule_line,
                               scan_notif->last_schedule_iteration,
                               __le32_to_cpu(scan_notif->time_after_last_iter));

                mvm->scan_status &= ~IWL_MVM_SCAN_SCHED;
                ieee80211_sched_scan_stopped(mvm->hw);
                mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_DISABLED;
        } else if (mvm->scan_status & IWL_MVM_SCAN_REGULAR) {
                struct cfg80211_scan_info info = {
                        .aborted = aborted,
                };

                IWL_DEBUG_SCAN(mvm, "Regular scan %s, EBS status %s (FW)\n",
                               aborted ? "aborted" : "completed",
                               iwl_mvm_ebs_status_str(scan_notif->ebs_status));

                mvm->scan_status &= ~IWL_MVM_SCAN_REGULAR;
                ieee80211_scan_completed(mvm->hw, &info);
                cancel_delayed_work(&mvm->scan_timeout_dwork);
                iwl_mvm_resume_tcm(mvm);
        } else {
                IWL_ERR(mvm,
                        "got scan complete notification but no scan is running\n");
        }

        mvm->last_ebs_successful =
                        scan_notif->ebs_status == IWL_SCAN_EBS_SUCCESS ||
                        scan_notif->ebs_status == IWL_SCAN_EBS_INACTIVE;
}

static int iwl_ssid_exist(u8 *ssid, u8 ssid_len, struct iwl_ssid_ie *ssid_list)
{
        int i;

        for (i = 0; i < PROBE_OPTION_MAX; i++) {
                if (!ssid_list[i].len)
                        break;
                if (ssid_list[i].len == ssid_len &&
                    !memcmp(ssid_list->ssid, ssid, ssid_len))
                        return i;
        }
        return -1;
}

/* We insert the SSIDs in an inverted order, because the FW will
 * invert it back.
 */
static void iwl_scan_build_ssids(struct iwl_mvm_scan_params *params,
                                 struct iwl_ssid_ie *ssids,
                                 u32 *ssid_bitmap)
{
        int i, j;
        int index;
        u32 tmp_bitmap = 0;

        /*
         * copy SSIDs from match list.
         * iwl_config_sched_scan_profiles() uses the order of these ssids to
         * config match list.
         */
        for (i = 0, j = params->n_match_sets - 1;
             j >= 0 && i < PROBE_OPTION_MAX;
             i++, j--) {
                /* skip empty SSID matchsets */
                if (!params->match_sets[j].ssid.ssid_len)
                        continue;
                ssids[i].id = WLAN_EID_SSID;
                ssids[i].len = params->match_sets[j].ssid.ssid_len;
                memcpy(ssids[i].ssid, params->match_sets[j].ssid.ssid,
                       ssids[i].len);
        }

        /* add SSIDs from scan SSID list */
        for (j = params->n_ssids - 1;
             j >= 0 && i < PROBE_OPTION_MAX;
             i++, j--) {
                index = iwl_ssid_exist(params->ssids[j].ssid,
                                       params->ssids[j].ssid_len,
                                       ssids);
                if (index < 0) {
                        ssids[i].id = WLAN_EID_SSID;
                        ssids[i].len = params->ssids[j].ssid_len;
                        memcpy(ssids[i].ssid, params->ssids[j].ssid,
                               ssids[i].len);
                        tmp_bitmap |= BIT(i);
                } else {
                        tmp_bitmap |= BIT(index);
                }
        }
        if (ssid_bitmap)
                *ssid_bitmap = tmp_bitmap;
}

static int
iwl_mvm_config_sched_scan_profiles(struct iwl_mvm *mvm,
                                   struct cfg80211_sched_scan_request *req)
{
        struct iwl_scan_offload_profile *profile;
        struct iwl_scan_offload_profile_cfg_v1 *profile_cfg_v1;
        struct iwl_scan_offload_blocklist *blocklist;
        struct iwl_scan_offload_profile_cfg_data *data;
        int max_profiles = iwl_umac_scan_get_max_profiles(mvm->fw);
        int profile_cfg_size = sizeof(*data) +
                sizeof(*profile) * max_profiles;
        struct iwl_host_cmd cmd = {
                .id = SCAN_OFFLOAD_UPDATE_PROFILES_CMD,
                .len[1] = profile_cfg_size,
                .dataflags[0] = IWL_HCMD_DFL_NOCOPY,
                .dataflags[1] = IWL_HCMD_DFL_NOCOPY,
        };
        int blocklist_len;
        int i;
        int ret;

        if (WARN_ON(req->n_match_sets > max_profiles))
                return -EIO;

        if (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_SHORT_BL)
                blocklist_len = IWL_SCAN_SHORT_BLACKLIST_LEN;
        else
                blocklist_len = IWL_SCAN_MAX_BLACKLIST_LEN;

        blocklist = kcalloc(blocklist_len, sizeof(*blocklist), GFP_KERNEL);
        if (!blocklist)
                return -ENOMEM;

        profile_cfg_v1 = kzalloc(profile_cfg_size, GFP_KERNEL);
        if (!profile_cfg_v1) {
                ret = -ENOMEM;
                goto free_blocklist;
        }

        cmd.data[0] = blocklist;
        cmd.len[0] = sizeof(*blocklist) * blocklist_len;
        cmd.data[1] = profile_cfg_v1;

        /* if max_profile is MAX_PROFILES_V2, we have the new API */
        if (max_profiles == IWL_SCAN_MAX_PROFILES_V2) {
                struct iwl_scan_offload_profile_cfg *profile_cfg =
                        (struct iwl_scan_offload_profile_cfg *)profile_cfg_v1;

                data = &profile_cfg->data;
        } else {
                data = &profile_cfg_v1->data;
        }

        /* No blocklist configuration */
        data->num_profiles = req->n_match_sets;
        data->active_clients = SCAN_CLIENT_SCHED_SCAN;
        data->pass_match = SCAN_CLIENT_SCHED_SCAN;
        data->match_notify = SCAN_CLIENT_SCHED_SCAN;

        if (!req->n_match_sets || !req->match_sets[0].ssid.ssid_len)
                data->any_beacon_notify = SCAN_CLIENT_SCHED_SCAN;

        for (i = 0; i < req->n_match_sets; i++) {
                profile = &profile_cfg_v1->profiles[i];
                profile->ssid_index = i;
                /* Support any cipher and auth algorithm */
                profile->unicast_cipher = 0xff;
                profile->auth_alg = 0xff;
                profile->network_type = IWL_NETWORK_TYPE_ANY;
                profile->band_selection = IWL_SCAN_OFFLOAD_SELECT_ANY;
                profile->client_bitmap = SCAN_CLIENT_SCHED_SCAN;
        }

        IWL_DEBUG_SCAN(mvm, "Sending scheduled scan profile config\n");

        ret = iwl_mvm_send_cmd(mvm, &cmd);
        kfree(profile_cfg_v1);
free_blocklist:
        kfree(blocklist);

        return ret;
}

static bool iwl_mvm_scan_pass_all(struct iwl_mvm *mvm,
                                  struct cfg80211_sched_scan_request *req)
{
        if (req->n_match_sets && req->match_sets[0].ssid.ssid_len) {
                IWL_DEBUG_SCAN(mvm,
                               "Sending scheduled scan with filtering, n_match_sets %d\n",
                               req->n_match_sets);
                mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_DISABLED;
                return false;
        }

        IWL_DEBUG_SCAN(mvm, "Sending Scheduled scan without filtering\n");

        mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_ENABLED;
        return true;
}

static int iwl_mvm_lmac_scan_abort(struct iwl_mvm *mvm)
{
        int ret;
        struct iwl_host_cmd cmd = {
                .id = SCAN_OFFLOAD_ABORT_CMD,
        };
        u32 status = CAN_ABORT_STATUS;

        ret = iwl_mvm_send_cmd_status(mvm, &cmd, &status);
        if (ret)
                return ret;

        if (status != CAN_ABORT_STATUS) {
                /*
                 * The scan abort will return 1 for success or
                 * 2 for "failure".  A failure condition can be
                 * due to simply not being in an active scan which
                 * can occur if we send the scan abort before the
                 * microcode has notified us that a scan is completed.
                 */
                IWL_DEBUG_SCAN(mvm, "SCAN OFFLOAD ABORT ret %d.\n", status);
                ret = -ENOENT;
        }

        return ret;
}

static void iwl_mvm_scan_fill_tx_cmd(struct iwl_mvm *mvm,
                                     struct iwl_scan_req_tx_cmd *tx_cmd,
                                     bool no_cck)
{
        tx_cmd[0].tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL |
                                         TX_CMD_FLG_BT_DIS);
        tx_cmd[0].rate_n_flags = iwl_mvm_scan_rate_n_flags(mvm,
                                                           NL80211_BAND_2GHZ,
                                                           no_cck);

        if (iwl_fw_lookup_cmd_ver(mvm->fw, LONG_GROUP,
                                  ADD_STA,
                                  0) < 12) {
                tx_cmd[0].sta_id = mvm->aux_sta.sta_id;
                tx_cmd[1].sta_id = mvm->aux_sta.sta_id;

        /*
         * Fw doesn't use this sta anymore, pending deprecation via HOST API
         * change
         */
        } else {
                tx_cmd[0].sta_id = 0xff;
                tx_cmd[1].sta_id = 0xff;
        }

        tx_cmd[1].tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL |
                                         TX_CMD_FLG_BT_DIS);

        tx_cmd[1].rate_n_flags = iwl_mvm_scan_rate_n_flags(mvm,
                                                           NL80211_BAND_5GHZ,
                                                           no_cck);
}

static void
iwl_mvm_lmac_scan_cfg_channels(struct iwl_mvm *mvm,
                               struct ieee80211_channel **channels,
                               int n_channels, u32 ssid_bitmap,
                               struct iwl_scan_req_lmac *cmd)
{
        struct iwl_scan_channel_cfg_lmac *channel_cfg = (void *)&cmd->data;
        int i;

        for (i = 0; i < n_channels; i++) {
                channel_cfg[i].channel_num =
                        cpu_to_le16(channels[i]->hw_value);
                channel_cfg[i].iter_count = cpu_to_le16(1);
                channel_cfg[i].iter_interval = 0;
                channel_cfg[i].flags =
                        cpu_to_le32(IWL_UNIFIED_SCAN_CHANNEL_PARTIAL |
                                    ssid_bitmap);
        }
}

static u8 *iwl_mvm_copy_and_insert_ds_elem(struct iwl_mvm *mvm, const u8 *ies,
                                           size_t len, u8 *const pos)
{
        static const u8 before_ds_params[] = {
                        WLAN_EID_SSID,
                        WLAN_EID_SUPP_RATES,
                        WLAN_EID_REQUEST,
                        WLAN_EID_EXT_SUPP_RATES,
        };
        size_t offs;
        u8 *newpos = pos;

        if (!iwl_mvm_rrm_scan_needed(mvm)) {
                memcpy(newpos, ies, len);
                return newpos + len;
        }

        offs = ieee80211_ie_split(ies, len,
                                  before_ds_params,
                                  ARRAY_SIZE(before_ds_params),
                                  0);

        memcpy(newpos, ies, offs);
        newpos += offs;

        /* Add a placeholder for DS Parameter Set element */
        *newpos++ = WLAN_EID_DS_PARAMS;
        *newpos++ = 1;
        *newpos++ = 0;

        memcpy(newpos, ies + offs, len - offs);
        newpos += len - offs;

        return newpos;
}

#define WFA_TPC_IE_LEN  9

static void iwl_mvm_add_tpc_report_ie(u8 *pos)
{
        pos[0] = WLAN_EID_VENDOR_SPECIFIC;
        pos[1] = WFA_TPC_IE_LEN - 2;
        pos[2] = (WLAN_OUI_MICROSOFT >> 16) & 0xff;
        pos[3] = (WLAN_OUI_MICROSOFT >> 8) & 0xff;
        pos[4] = WLAN_OUI_MICROSOFT & 0xff;
        pos[5] = WLAN_OUI_TYPE_MICROSOFT_TPC;
        pos[6] = 0;
        /* pos[7] - tx power will be inserted by the FW */
        pos[7] = 0;
        pos[8] = 0;
}

static void
iwl_mvm_build_scan_probe(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
                         struct ieee80211_scan_ies *ies,
                         struct iwl_mvm_scan_params *params)
{
        struct ieee80211_mgmt *frame = (void *)params->preq.buf;
        u8 *pos, *newpos;
        const u8 *mac_addr = params->flags & NL80211_SCAN_FLAG_RANDOM_ADDR ?
                params->mac_addr : NULL;

        /*
         * Unfortunately, right now the offload scan doesn't support randomising
         * within the firmware, so until the firmware API is ready we implement
         * it in the driver. This means that the scan iterations won't really be
         * random, only when it's restarted, but at least that helps a bit.
         */
        if (mac_addr)
                get_random_mask_addr(frame->sa, mac_addr,
                                     params->mac_addr_mask);
        else
                memcpy(frame->sa, vif->addr, ETH_ALEN);

        frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
        eth_broadcast_addr(frame->da);
        eth_broadcast_addr(frame->bssid);
        frame->seq_ctrl = 0;

        pos = frame->u.probe_req.variable;
        *pos++ = WLAN_EID_SSID;
        *pos++ = 0;

        params->preq.mac_header.offset = 0;
        params->preq.mac_header.len = cpu_to_le16(24 + 2);

        /* Insert ds parameter set element on 2.4 GHz band */
        newpos = iwl_mvm_copy_and_insert_ds_elem(mvm,
                                                 ies->ies[NL80211_BAND_2GHZ],
                                                 ies->len[NL80211_BAND_2GHZ],
                                                 pos);
        params->preq.band_data[0].offset = cpu_to_le16(pos - params->preq.buf);
        params->preq.band_data[0].len = cpu_to_le16(newpos - pos);
        pos = newpos;

        memcpy(pos, ies->ies[NL80211_BAND_5GHZ],
               ies->len[NL80211_BAND_5GHZ]);
        params->preq.band_data[1].offset = cpu_to_le16(pos - params->preq.buf);
        params->preq.band_data[1].len =
                cpu_to_le16(ies->len[NL80211_BAND_5GHZ]);
        pos += ies->len[NL80211_BAND_5GHZ];

        memcpy(pos, ies->ies[NL80211_BAND_6GHZ],
               ies->len[NL80211_BAND_6GHZ]);
        params->preq.band_data[2].offset = cpu_to_le16(pos - params->preq.buf);
        params->preq.band_data[2].len =
                cpu_to_le16(ies->len[NL80211_BAND_6GHZ]);
        pos += ies->len[NL80211_BAND_6GHZ];
        memcpy(pos, ies->common_ies, ies->common_ie_len);
        params->preq.common_data.offset = cpu_to_le16(pos - params->preq.buf);

        if (iwl_mvm_rrm_scan_needed(mvm) &&
            !fw_has_capa(&mvm->fw->ucode_capa,
                         IWL_UCODE_TLV_CAPA_WFA_TPC_REP_IE_SUPPORT)) {
                iwl_mvm_add_tpc_report_ie(pos + ies->common_ie_len);
                params->preq.common_data.len = cpu_to_le16(ies->common_ie_len +
                                                           WFA_TPC_IE_LEN);
        } else {
                params->preq.common_data.len = cpu_to_le16(ies->common_ie_len);
        }
}

static void iwl_mvm_scan_lmac_dwell(struct iwl_mvm *mvm,
                                    struct iwl_scan_req_lmac *cmd,
                                    struct iwl_mvm_scan_params *params)
{
        cmd->active_dwell = IWL_SCAN_DWELL_ACTIVE;
        cmd->passive_dwell = IWL_SCAN_DWELL_PASSIVE;
        cmd->fragmented_dwell = IWL_SCAN_DWELL_FRAGMENTED;
        cmd->extended_dwell = IWL_SCAN_DWELL_EXTENDED;
        cmd->max_out_time = cpu_to_le32(scan_timing[params->type].max_out_time);
        cmd->suspend_time = cpu_to_le32(scan_timing[params->type].suspend_time);
        cmd->scan_prio = cpu_to_le32(IWL_SCAN_PRIORITY_EXT_6);
}

static inline bool iwl_mvm_scan_fits(struct iwl_mvm *mvm, int n_ssids,
                                     struct ieee80211_scan_ies *ies,
                                     int n_channels)
{
        return ((n_ssids <= PROBE_OPTION_MAX) &&
                (n_channels <= mvm->fw->ucode_capa.n_scan_channels) &
                (ies->common_ie_len +
                 ies->len[NL80211_BAND_2GHZ] +
                 ies->len[NL80211_BAND_5GHZ] <=
                 iwl_mvm_max_scan_ie_fw_cmd_room(mvm)));
}

static inline bool iwl_mvm_scan_use_ebs(struct iwl_mvm *mvm,
                                        struct ieee80211_vif *vif)
{
        const struct iwl_ucode_capabilities *capa = &mvm->fw->ucode_capa;
        bool low_latency;

        if (iwl_mvm_is_cdb_supported(mvm))
                low_latency = iwl_mvm_low_latency_band(mvm, NL80211_BAND_5GHZ);
        else
                low_latency = iwl_mvm_low_latency(mvm);

        /* We can only use EBS if:
         *      1. the feature is supported;
         *      2. the last EBS was successful;
         *      3. if only single scan, the single scan EBS API is supported;
         *      4. it's not a p2p find operation.
         *      5. we are not in low latency mode,
         *         or if fragmented ebs is supported by the FW
         */
        return ((capa->flags & IWL_UCODE_TLV_FLAGS_EBS_SUPPORT) &&
                mvm->last_ebs_successful && IWL_MVM_ENABLE_EBS &&
                vif->type != NL80211_IFTYPE_P2P_DEVICE &&
                (!low_latency || iwl_mvm_is_frag_ebs_supported(mvm)));
}

static inline bool iwl_mvm_is_regular_scan(struct iwl_mvm_scan_params *params)
{
        return params->n_scan_plans == 1 &&
                params->scan_plans[0].iterations == 1;
}

static bool iwl_mvm_is_scan_fragmented(enum iwl_mvm_scan_type type)
{
        return (type == IWL_SCAN_TYPE_FRAGMENTED ||
                type == IWL_SCAN_TYPE_FAST_BALANCE);
}

static int iwl_mvm_scan_lmac_flags(struct iwl_mvm *mvm,
                                   struct iwl_mvm_scan_params *params,
                                   struct ieee80211_vif *vif)
{
        int flags = 0;

        if (params->n_ssids == 0)
                flags |= IWL_MVM_LMAC_SCAN_FLAG_PASSIVE;

        if (params->n_ssids == 1 && params->ssids[0].ssid_len != 0)
                flags |= IWL_MVM_LMAC_SCAN_FLAG_PRE_CONNECTION;

        if (iwl_mvm_is_scan_fragmented(params->type))
                flags |= IWL_MVM_LMAC_SCAN_FLAG_FRAGMENTED;

        if (iwl_mvm_rrm_scan_needed(mvm) &&
            fw_has_capa(&mvm->fw->ucode_capa,
                        IWL_UCODE_TLV_CAPA_WFA_TPC_REP_IE_SUPPORT))
                flags |= IWL_MVM_LMAC_SCAN_FLAGS_RRM_ENABLED;

        if (params->pass_all)
                flags |= IWL_MVM_LMAC_SCAN_FLAG_PASS_ALL;
        else
                flags |= IWL_MVM_LMAC_SCAN_FLAG_MATCH;

#ifdef CONFIG_IWLWIFI_DEBUGFS
        if (mvm->scan_iter_notif_enabled)
                flags |= IWL_MVM_LMAC_SCAN_FLAG_ITER_COMPLETE;
#endif

        if (mvm->sched_scan_pass_all == SCHED_SCAN_PASS_ALL_ENABLED)
                flags |= IWL_MVM_LMAC_SCAN_FLAG_ITER_COMPLETE;

        if (iwl_mvm_is_regular_scan(params) &&
            vif->type != NL80211_IFTYPE_P2P_DEVICE &&
            !iwl_mvm_is_scan_fragmented(params->type))
                flags |= IWL_MVM_LMAC_SCAN_FLAG_EXTENDED_DWELL;

        return flags;
}

static void
iwl_mvm_scan_set_legacy_probe_req(struct iwl_scan_probe_req_v1 *p_req,
                                  struct iwl_scan_probe_req *src_p_req)
{
        int i;

        p_req->mac_header = src_p_req->mac_header;
        for (i = 0; i < SCAN_NUM_BAND_PROBE_DATA_V_1; i++)
                p_req->band_data[i] = src_p_req->band_data[i];
        p_req->common_data = src_p_req->common_data;
        memcpy(p_req->buf, src_p_req->buf, sizeof(p_req->buf));
}

static int iwl_mvm_scan_lmac(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
                             struct iwl_mvm_scan_params *params)
{
        struct iwl_scan_req_lmac *cmd = mvm->scan_cmd;
        struct iwl_scan_probe_req_v1 *preq =
                (void *)(cmd->data + sizeof(struct iwl_scan_channel_cfg_lmac) *
                         mvm->fw->ucode_capa.n_scan_channels);
        u32 ssid_bitmap = 0;
        int i;
        u8 band;

        if (WARN_ON(params->n_scan_plans > IWL_MAX_SCHED_SCAN_PLANS))
                return -EINVAL;

        iwl_mvm_scan_lmac_dwell(mvm, cmd, params);

        cmd->rx_chain_select = iwl_mvm_scan_rx_chain(mvm);
        cmd->iter_num = cpu_to_le32(1);
        cmd->n_channels = (u8)params->n_channels;

        cmd->delay = cpu_to_le32(params->delay);

        cmd->scan_flags = cpu_to_le32(iwl_mvm_scan_lmac_flags(mvm, params,
                                                              vif));

        band = iwl_mvm_phy_band_from_nl80211(params->channels[0]->band);
        cmd->flags = cpu_to_le32(band);
        cmd->filter_flags = cpu_to_le32(MAC_FILTER_ACCEPT_GRP |
                                        MAC_FILTER_IN_BEACON);
        iwl_mvm_scan_fill_tx_cmd(mvm, cmd->tx_cmd, params->no_cck);
        iwl_scan_build_ssids(params, cmd->direct_scan, &ssid_bitmap);

        /* this API uses bits 1-20 instead of 0-19 */
        ssid_bitmap <<= 1;

        for (i = 0; i < params->n_scan_plans; i++) {
                struct cfg80211_sched_scan_plan *scan_plan =
                        &params->scan_plans[i];

                cmd->schedule[i].delay =
                        cpu_to_le16(scan_plan->interval);
                cmd->schedule[i].iterations = scan_plan->iterations;
                cmd->schedule[i].full_scan_mul = 1;
        }

        /*
         * If the number of iterations of the last scan plan is set to
         * zero, it should run infinitely. However, this is not always the case.
         * For example, when regular scan is requested the driver sets one scan
         * plan with one iteration.
         */
        if (!cmd->schedule[i - 1].iterations)
                cmd->schedule[i - 1].iterations = 0xff;

        if (iwl_mvm_scan_use_ebs(mvm, vif)) {
                cmd->channel_opt[0].flags =
                        cpu_to_le16(IWL_SCAN_CHANNEL_FLAG_EBS |
                                    IWL_SCAN_CHANNEL_FLAG_EBS_ACCURATE |
                                    IWL_SCAN_CHANNEL_FLAG_CACHE_ADD);
                cmd->channel_opt[0].non_ebs_ratio =
                        cpu_to_le16(IWL_DENSE_EBS_SCAN_RATIO);
                cmd->channel_opt[1].flags =
                        cpu_to_le16(IWL_SCAN_CHANNEL_FLAG_EBS |
                                    IWL_SCAN_CHANNEL_FLAG_EBS_ACCURATE |
                                    IWL_SCAN_CHANNEL_FLAG_CACHE_ADD);
                cmd->channel_opt[1].non_ebs_ratio =
                        cpu_to_le16(IWL_SPARSE_EBS_SCAN_RATIO);
        }

        iwl_mvm_lmac_scan_cfg_channels(mvm, params->channels,
                                       params->n_channels, ssid_bitmap, cmd);

        iwl_mvm_scan_set_legacy_probe_req(preq, &params->preq);

        return 0;
}

static int rate_to_scan_rate_flag(unsigned int rate)
{
        static const int rate_to_scan_rate[IWL_RATE_COUNT] = {
                [IWL_RATE_1M_INDEX]     = SCAN_CONFIG_RATE_1M,
                [IWL_RATE_2M_INDEX]     = SCAN_CONFIG_RATE_2M,
                [IWL_RATE_5M_INDEX]     = SCAN_CONFIG_RATE_5M,
                [IWL_RATE_11M_INDEX]    = SCAN_CONFIG_RATE_11M,
                [IWL_RATE_6M_INDEX]     = SCAN_CONFIG_RATE_6M,
                [IWL_RATE_9M_INDEX]     = SCAN_CONFIG_RATE_9M,
                [IWL_RATE_12M_INDEX]    = SCAN_CONFIG_RATE_12M,
                [IWL_RATE_18M_INDEX]    = SCAN_CONFIG_RATE_18M,
                [IWL_RATE_24M_INDEX]    = SCAN_CONFIG_RATE_24M,
                [IWL_RATE_36M_INDEX]    = SCAN_CONFIG_RATE_36M,
                [IWL_RATE_48M_INDEX]    = SCAN_CONFIG_RATE_48M,
                [IWL_RATE_54M_INDEX]    = SCAN_CONFIG_RATE_54M,
        };

        return rate_to_scan_rate[rate];
}

static __le32 iwl_mvm_scan_config_rates(struct iwl_mvm *mvm)
{
        struct ieee80211_supported_band *band;
        unsigned int rates = 0;
        int i;

        band = &mvm->nvm_data->bands[NL80211_BAND_2GHZ];
        for (i = 0; i < band->n_bitrates; i++)
                rates |= rate_to_scan_rate_flag(band->bitrates[i].hw_value);
        band = &mvm->nvm_data->bands[NL80211_BAND_5GHZ];
        for (i = 0; i < band->n_bitrates; i++)
                rates |= rate_to_scan_rate_flag(band->bitrates[i].hw_value);

        /* Set both basic rates and supported rates */
        rates |= SCAN_CONFIG_SUPPORTED_RATE(rates);

        return cpu_to_le32(rates);
}

static void iwl_mvm_fill_scan_dwell(struct iwl_mvm *mvm,
                                    struct iwl_scan_dwell *dwell)
{
        dwell->active = IWL_SCAN_DWELL_ACTIVE;
        dwell->passive = IWL_SCAN_DWELL_PASSIVE;
        dwell->fragmented = IWL_SCAN_DWELL_FRAGMENTED;
        dwell->extended = IWL_SCAN_DWELL_EXTENDED;
}

static void iwl_mvm_fill_channels(struct iwl_mvm *mvm, u8 *channels,
                                  u32 max_channels)
{
        struct ieee80211_supported_band *band;
        int i, j = 0;

        band = &mvm->nvm_data->bands[NL80211_BAND_2GHZ];
        for (i = 0; i < band->n_channels && j < max_channels; i++, j++)
                channels[j] = band->channels[i].hw_value;
        band = &mvm->nvm_data->bands[NL80211_BAND_5GHZ];
        for (i = 0; i < band->n_channels && j < max_channels; i++, j++)
                channels[j] = band->channels[i].hw_value;
}

static void iwl_mvm_fill_scan_config_v1(struct iwl_mvm *mvm, void *config,
                                        u32 flags, u8 channel_flags,
                                        u32 max_channels)
{
        enum iwl_mvm_scan_type type = iwl_mvm_get_scan_type(mvm, NULL);
        struct iwl_scan_config_v1 *cfg = config;

        cfg->flags = cpu_to_le32(flags);
        cfg->tx_chains = cpu_to_le32(iwl_mvm_get_valid_tx_ant(mvm));
        cfg->rx_chains = cpu_to_le32(iwl_mvm_scan_rx_ant(mvm));
        cfg->legacy_rates = iwl_mvm_scan_config_rates(mvm);
        cfg->out_of_channel_time = cpu_to_le32(scan_timing[type].max_out_time);
        cfg->suspend_time = cpu_to_le32(scan_timing[type].suspend_time);

        iwl_mvm_fill_scan_dwell(mvm, &cfg->dwell);

        memcpy(&cfg->mac_addr, &mvm->addresses[0].addr, ETH_ALEN);

        /* This function should not be called when using ADD_STA ver >=12 */
        WARN_ON_ONCE(iwl_fw_lookup_cmd_ver(mvm->fw, LONG_GROUP,
                                           ADD_STA, 0) >= 12);

        cfg->bcast_sta_id = mvm->aux_sta.sta_id;
        cfg->channel_flags = channel_flags;

        iwl_mvm_fill_channels(mvm, cfg->channel_array, max_channels);
}

static void iwl_mvm_fill_scan_config_v2(struct iwl_mvm *mvm, void *config,
                                        u32 flags, u8 channel_flags,
                                        u32 max_channels)
{
        struct iwl_scan_config_v2 *cfg = config;

        cfg->flags = cpu_to_le32(flags);
        cfg->tx_chains = cpu_to_le32(iwl_mvm_get_valid_tx_ant(mvm));
        cfg->rx_chains = cpu_to_le32(iwl_mvm_scan_rx_ant(mvm));
        cfg->legacy_rates = iwl_mvm_scan_config_rates(mvm);

        if (iwl_mvm_is_cdb_supported(mvm)) {
                enum iwl_mvm_scan_type lb_type, hb_type;

                lb_type = iwl_mvm_get_scan_type_band(mvm, NULL,
                                                     NL80211_BAND_2GHZ);
                hb_type = iwl_mvm_get_scan_type_band(mvm, NULL,
                                                     NL80211_BAND_5GHZ);

                cfg->out_of_channel_time[SCAN_LB_LMAC_IDX] =
                        cpu_to_le32(scan_timing[lb_type].max_out_time);
                cfg->suspend_time[SCAN_LB_LMAC_IDX] =
                        cpu_to_le32(scan_timing[lb_type].suspend_time);

                cfg->out_of_channel_time[SCAN_HB_LMAC_IDX] =
                        cpu_to_le32(scan_timing[hb_type].max_out_time);
                cfg->suspend_time[SCAN_HB_LMAC_IDX] =
                        cpu_to_le32(scan_timing[hb_type].suspend_time);
        } else {
                enum iwl_mvm_scan_type type =
                        iwl_mvm_get_scan_type(mvm, NULL);

                cfg->out_of_channel_time[SCAN_LB_LMAC_IDX] =
                        cpu_to_le32(scan_timing[type].max_out_time);
                cfg->suspend_time[SCAN_LB_LMAC_IDX] =
                        cpu_to_le32(scan_timing[type].suspend_time);
        }

        iwl_mvm_fill_scan_dwell(mvm, &cfg->dwell);

        memcpy(&cfg->mac_addr, &mvm->addresses[0].addr, ETH_ALEN);

        /* This function should not be called when using ADD_STA ver >=12 */
        WARN_ON_ONCE(iwl_fw_lookup_cmd_ver(mvm->fw, LONG_GROUP,
                                           ADD_STA, 0) >= 12);

        cfg->bcast_sta_id = mvm->aux_sta.sta_id;
        cfg->channel_flags = channel_flags;

        iwl_mvm_fill_channels(mvm, cfg->channel_array, max_channels);
}

static int iwl_mvm_legacy_config_scan(struct iwl_mvm *mvm)
{
        void *cfg;
        int ret, cmd_size;
        struct iwl_host_cmd cmd = {
                .id = iwl_cmd_id(SCAN_CFG_CMD, IWL_ALWAYS_LONG_GROUP, 0),
        };
        enum iwl_mvm_scan_type type;
        enum iwl_mvm_scan_type hb_type = IWL_SCAN_TYPE_NOT_SET;
        int num_channels =
                mvm->nvm_data->bands[NL80211_BAND_2GHZ].n_channels +
                mvm->nvm_data->bands[NL80211_BAND_5GHZ].n_channels;
        u32 flags;
        u8 channel_flags;

        if (WARN_ON(num_channels > mvm->fw->ucode_capa.n_scan_channels))
                num_channels = mvm->fw->ucode_capa.n_scan_channels;

        if (iwl_mvm_is_cdb_supported(mvm)) {
                type = iwl_mvm_get_scan_type_band(mvm, NULL,
                                                  NL80211_BAND_2GHZ);
                hb_type = iwl_mvm_get_scan_type_band(mvm, NULL,
                                                     NL80211_BAND_5GHZ);
                if (type == mvm->scan_type && hb_type == mvm->hb_scan_type)
                        return 0;
        } else {
                type = iwl_mvm_get_scan_type(mvm, NULL);
                if (type == mvm->scan_type)
                        return 0;
        }

        if (iwl_mvm_cdb_scan_api(mvm))
                cmd_size = sizeof(struct iwl_scan_config_v2);
        else
                cmd_size = sizeof(struct iwl_scan_config_v1);
        cmd_size += mvm->fw->ucode_capa.n_scan_channels;

        cfg = kzalloc(cmd_size, GFP_KERNEL);
        if (!cfg)
                return -ENOMEM;

        flags = SCAN_CONFIG_FLAG_ACTIVATE |
                 SCAN_CONFIG_FLAG_ALLOW_CHUB_REQS |
                 SCAN_CONFIG_FLAG_SET_TX_CHAINS |
                 SCAN_CONFIG_FLAG_SET_RX_CHAINS |
                 SCAN_CONFIG_FLAG_SET_AUX_STA_ID |
                 SCAN_CONFIG_FLAG_SET_ALL_TIMES |
                 SCAN_CONFIG_FLAG_SET_LEGACY_RATES |
                 SCAN_CONFIG_FLAG_SET_MAC_ADDR |
                 SCAN_CONFIG_FLAG_SET_CHANNEL_FLAGS |
                 SCAN_CONFIG_N_CHANNELS(num_channels) |
                 (iwl_mvm_is_scan_fragmented(type) ?
                  SCAN_CONFIG_FLAG_SET_FRAGMENTED :
                  SCAN_CONFIG_FLAG_CLEAR_FRAGMENTED);

        channel_flags = IWL_CHANNEL_FLAG_EBS |
                        IWL_CHANNEL_FLAG_ACCURATE_EBS |
                        IWL_CHANNEL_FLAG_EBS_ADD |
                        IWL_CHANNEL_FLAG_PRE_SCAN_PASSIVE2ACTIVE;

        /*
         * Check for fragmented scan on LMAC2 - high band.
         * LMAC1 - low band is checked above.
         */
        if (iwl_mvm_cdb_scan_api(mvm)) {
                if (iwl_mvm_is_cdb_supported(mvm))
                        flags |= (iwl_mvm_is_scan_fragmented(hb_type)) ?
                                 SCAN_CONFIG_FLAG_SET_LMAC2_FRAGMENTED :
                                 SCAN_CONFIG_FLAG_CLEAR_LMAC2_FRAGMENTED;
                iwl_mvm_fill_scan_config_v2(mvm, cfg, flags, channel_flags,
                                            num_channels);
        } else {
                iwl_mvm_fill_scan_config_v1(mvm, cfg, flags, channel_flags,
                                            num_channels);
        }

        cmd.data[0] = cfg;
        cmd.len[0] = cmd_size;
        cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;

        IWL_DEBUG_SCAN(mvm, "Sending UMAC scan config\n");

        ret = iwl_mvm_send_cmd(mvm, &cmd);
        if (!ret) {
                mvm->scan_type = type;
                mvm->hb_scan_type = hb_type;
        }

        kfree(cfg);
        return ret;
}

int iwl_mvm_config_scan(struct iwl_mvm *mvm)
{
        struct iwl_scan_config cfg;
        struct iwl_host_cmd cmd = {
                .id = iwl_cmd_id(SCAN_CFG_CMD, IWL_ALWAYS_LONG_GROUP, 0),
                .len[0] = sizeof(cfg),
                .data[0] = &cfg,
                .dataflags[0] = IWL_HCMD_DFL_NOCOPY,
        };

        if (!iwl_mvm_is_reduced_config_scan_supported(mvm))
                return iwl_mvm_legacy_config_scan(mvm);

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

        if (iwl_fw_lookup_cmd_ver(mvm->fw, LONG_GROUP,
                                  ADD_STA, 0) < 12) {
                cfg.bcast_sta_id = mvm->aux_sta.sta_id;
        } else if (iwl_fw_lookup_cmd_ver(mvm->fw, LONG_GROUP,
                                         SCAN_CFG_CMD, 0) < 5) {
                /*
                 * Fw doesn't use this sta anymore. Deprecated on SCAN_CFG_CMD
                 * version 5.
                 */
                cfg.bcast_sta_id = 0xff;
        }

        cfg.tx_chains = cpu_to_le32(iwl_mvm_get_valid_tx_ant(mvm));
        cfg.rx_chains = cpu_to_le32(iwl_mvm_scan_rx_ant(mvm));

        IWL_DEBUG_SCAN(mvm, "Sending UMAC scan config\n");

        return iwl_mvm_send_cmd(mvm, &cmd);
}

static int iwl_mvm_scan_uid_by_status(struct iwl_mvm *mvm, int status)
{
        int i;

        for (i = 0; i < mvm->max_scans; i++)
                if (mvm->scan_uid_status[i] == status)
                        return i;

        return -ENOENT;
}

static void iwl_mvm_scan_umac_dwell(struct iwl_mvm *mvm,
                                    struct iwl_scan_req_umac *cmd,
                                    struct iwl_mvm_scan_params *params)
{
        struct iwl_mvm_scan_timing_params *timing, *hb_timing;
        u8 active_dwell, passive_dwell;

        timing = &scan_timing[params->type];
        active_dwell = IWL_SCAN_DWELL_ACTIVE;
        passive_dwell = IWL_SCAN_DWELL_PASSIVE;

        if (iwl_mvm_is_adaptive_dwell_supported(mvm)) {
                cmd->v7.adwell_default_n_aps_social =
                        IWL_SCAN_ADWELL_DEFAULT_N_APS_SOCIAL;
                cmd->v7.adwell_default_n_aps =
                        IWL_SCAN_ADWELL_DEFAULT_LB_N_APS;

                if (iwl_mvm_is_adwell_hb_ap_num_supported(mvm))
                        cmd->v9.adwell_default_hb_n_aps =
                                IWL_SCAN_ADWELL_DEFAULT_HB_N_APS;

                /* if custom max budget was configured with debugfs */
                if (IWL_MVM_ADWELL_MAX_BUDGET)
                        cmd->v7.adwell_max_budget =
                                cpu_to_le16(IWL_MVM_ADWELL_MAX_BUDGET);
                else if (params->ssids && params->ssids[0].ssid_len)
                        cmd->v7.adwell_max_budget =
                                cpu_to_le16(IWL_SCAN_ADWELL_MAX_BUDGET_DIRECTED_SCAN);
                else
                        cmd->v7.adwell_max_budget =
                                cpu_to_le16(IWL_SCAN_ADWELL_MAX_BUDGET_FULL_SCAN);

                cmd->v7.scan_priority = cpu_to_le32(IWL_SCAN_PRIORITY_EXT_6);
                cmd->v7.max_out_time[SCAN_LB_LMAC_IDX] =
                        cpu_to_le32(timing->max_out_time);
                cmd->v7.suspend_time[SCAN_LB_LMAC_IDX] =
                        cpu_to_le32(timing->suspend_time);

                if (iwl_mvm_is_cdb_supported(mvm)) {
                        hb_timing = &scan_timing[params->hb_type];

                        cmd->v7.max_out_time[SCAN_HB_LMAC_IDX] =
                                cpu_to_le32(hb_timing->max_out_time);
                        cmd->v7.suspend_time[SCAN_HB_LMAC_IDX] =
                                cpu_to_le32(hb_timing->suspend_time);
                }

                if (!iwl_mvm_is_adaptive_dwell_v2_supported(mvm)) {
                        cmd->v7.active_dwell = active_dwell;
                        cmd->v7.passive_dwell = passive_dwell;
                        cmd->v7.fragmented_dwell = IWL_SCAN_DWELL_FRAGMENTED;
                } else {
                        cmd->v8.active_dwell[SCAN_LB_LMAC_IDX] = active_dwell;
                        cmd->v8.passive_dwell[SCAN_LB_LMAC_IDX] = passive_dwell;
                        if (iwl_mvm_is_cdb_supported(mvm)) {
                                cmd->v8.active_dwell[SCAN_HB_LMAC_IDX] =
                                        active_dwell;
                                cmd->v8.passive_dwell[SCAN_HB_LMAC_IDX] =
                                        passive_dwell;
                        }
                }
        } else {
                cmd->v1.extended_dwell = IWL_SCAN_DWELL_EXTENDED;
                cmd->v1.active_dwell = active_dwell;
                cmd->v1.passive_dwell = passive_dwell;
                cmd->v1.fragmented_dwell = IWL_SCAN_DWELL_FRAGMENTED;

                if (iwl_mvm_is_cdb_supported(mvm)) {
                        hb_timing = &scan_timing[params->hb_type];

                        cmd->v6.max_out_time[SCAN_HB_LMAC_IDX] =
                                        cpu_to_le32(hb_timing->max_out_time);
                        cmd->v6.suspend_time[SCAN_HB_LMAC_IDX] =
                                        cpu_to_le32(hb_timing->suspend_time);
                }

                if (iwl_mvm_cdb_scan_api(mvm)) {
                        cmd->v6.scan_priority =
                                cpu_to_le32(IWL_SCAN_PRIORITY_EXT_6);
                        cmd->v6.max_out_time[SCAN_LB_LMAC_IDX] =
                                cpu_to_le32(timing->max_out_time);
                        cmd->v6.suspend_time[SCAN_LB_LMAC_IDX] =
                                cpu_to_le32(timing->suspend_time);
                } else {
                        cmd->v1.scan_priority =
                                cpu_to_le32(IWL_SCAN_PRIORITY_EXT_6);
                        cmd->v1.max_out_time =
                                cpu_to_le32(timing->max_out_time);
                        cmd->v1.suspend_time =
                                cpu_to_le32(timing->suspend_time);
                }
        }

        if (iwl_mvm_is_regular_scan(params))
                cmd->ooc_priority = cpu_to_le32(IWL_SCAN_PRIORITY_EXT_6);
        else
                cmd->ooc_priority = cpu_to_le32(IWL_SCAN_PRIORITY_EXT_2);
}

static u32 iwl_mvm_scan_umac_ooc_priority(struct iwl_mvm_scan_params *params)
{
        return iwl_mvm_is_regular_scan(params) ?
                IWL_SCAN_PRIORITY_EXT_6 :
                IWL_SCAN_PRIORITY_EXT_2;
}

static void
iwl_mvm_scan_umac_dwell_v10(struct iwl_mvm *mvm,
                            struct iwl_scan_general_params_v10 *general_params,
                            struct iwl_mvm_scan_params *params)
{
        struct iwl_mvm_scan_timing_params *timing, *hb_timing;
        u8 active_dwell, passive_dwell;

        timing = &scan_timing[params->type];
        active_dwell = IWL_SCAN_DWELL_ACTIVE;
        passive_dwell = IWL_SCAN_DWELL_PASSIVE;

        general_params->adwell_default_social_chn =
                IWL_SCAN_ADWELL_DEFAULT_N_APS_SOCIAL;
        general_params->adwell_default_2g = IWL_SCAN_ADWELL_DEFAULT_LB_N_APS;
        general_params->adwell_default_5g = IWL_SCAN_ADWELL_DEFAULT_HB_N_APS;

        /* if custom max budget was configured with debugfs */
        if (IWL_MVM_ADWELL_MAX_BUDGET)
                general_params->adwell_max_budget =
                        cpu_to_le16(IWL_MVM_ADWELL_MAX_BUDGET);
        else if (params->ssids && params->ssids[0].ssid_len)
                general_params->adwell_max_budget =
                        cpu_to_le16(IWL_SCAN_ADWELL_MAX_BUDGET_DIRECTED_SCAN);
        else
                general_params->adwell_max_budget =
                        cpu_to_le16(IWL_SCAN_ADWELL_MAX_BUDGET_FULL_SCAN);

        general_params->scan_priority = cpu_to_le32(IWL_SCAN_PRIORITY_EXT_6);
        general_params->max_out_of_time[SCAN_LB_LMAC_IDX] =
                cpu_to_le32(timing->max_out_time);
        general_params->suspend_time[SCAN_LB_LMAC_IDX] =
                cpu_to_le32(timing->suspend_time);

        hb_timing = &scan_timing[params->hb_type];

        general_params->max_out_of_time[SCAN_HB_LMAC_IDX] =
                cpu_to_le32(hb_timing->max_out_time);
        general_params->suspend_time[SCAN_HB_LMAC_IDX] =
                cpu_to_le32(hb_timing->suspend_time);

        general_params->active_dwell[SCAN_LB_LMAC_IDX] = active_dwell;
        general_params->passive_dwell[SCAN_LB_LMAC_IDX] = passive_dwell;
        general_params->active_dwell[SCAN_HB_LMAC_IDX] = active_dwell;
        general_params->passive_dwell[SCAN_HB_LMAC_IDX] = passive_dwell;
}

struct iwl_mvm_scan_channel_segment {
        u8 start_idx;
        u8 end_idx;
        u8 first_channel_id;
        u8 last_channel_id;
        u8 channel_spacing_shift;
        u8 band;
};

static const struct iwl_mvm_scan_channel_segment scan_channel_segments[] = {
        {
                .start_idx = 0,
                .end_idx = 13,
                .first_channel_id = 1,
                .last_channel_id = 14,
                .channel_spacing_shift = 0,
                .band = PHY_BAND_24
        },
        {
                .start_idx = 14,
                .end_idx = 41,
                .first_channel_id = 36,
                .last_channel_id = 144,
                .channel_spacing_shift = 2,
                .band = PHY_BAND_5
        },
        {
                .start_idx = 42,
                .end_idx = 50,
                .first_channel_id = 149,
                .last_channel_id = 181,
                .channel_spacing_shift = 2,
                .band = PHY_BAND_5
        },
        {
                .start_idx = 51,
                .end_idx = 111,
                .first_channel_id = 1,
                .last_channel_id = 241,
                .channel_spacing_shift = 2,
                .band = PHY_BAND_6
        },
};

static int iwl_mvm_scan_ch_and_band_to_idx(u8 channel_id, u8 band)
{
        int i, index;

        if (!channel_id)
                return -EINVAL;

        for (i = 0; i < ARRAY_SIZE(scan_channel_segments); i++) {
                const struct iwl_mvm_scan_channel_segment *ch_segment =
                        &scan_channel_segments[i];
                u32 ch_offset;

                if (ch_segment->band != band ||
                    ch_segment->first_channel_id > channel_id ||
                    ch_segment->last_channel_id < channel_id)
                        continue;

                ch_offset = (channel_id - ch_segment->first_channel_id) >>
                        ch_segment->channel_spacing_shift;

                index = scan_channel_segments[i].start_idx + ch_offset;
                if (index < IWL_SCAN_NUM_CHANNELS)
                        return index;

                break;
        }

        return -EINVAL;
}

static const u8 p2p_go_friendly_chs[] = {
        36, 40, 44, 48, 149, 153, 157, 161, 165,
};

static const u8 social_chs[] = {
        1, 6, 11
};

static void iwl_mvm_scan_ch_add_n_aps_override(enum nl80211_iftype vif_type,
                                               u8 ch_id, u8 band, u8 *ch_bitmap,
                                               size_t bitmap_n_entries)
{
        int i;

        if (vif_type != NL80211_IFTYPE_P2P_DEVICE)
                return;

        for (i = 0; i < ARRAY_SIZE(p2p_go_friendly_chs); i++) {
                if (p2p_go_friendly_chs[i] == ch_id) {
                        int ch_idx, bitmap_idx;

                        ch_idx = iwl_mvm_scan_ch_and_band_to_idx(ch_id, band);
                        if (ch_idx < 0)
                                return;

                        bitmap_idx = ch_idx / 8;
                        if (bitmap_idx >= bitmap_n_entries)
                                return;

                        ch_idx = ch_idx % 8;
                        ch_bitmap[bitmap_idx] |= BIT(ch_idx);

                        return;
                }
        }
}

static u32 iwl_mvm_scan_ch_n_aps_flag(enum nl80211_iftype vif_type, u8 ch_id)
{
        int i;
        u32 flags = 0;

        if (vif_type != NL80211_IFTYPE_P2P_DEVICE)
                goto out;

        for (i = 0; i < ARRAY_SIZE(p2p_go_friendly_chs); i++) {
                if (p2p_go_friendly_chs[i] == ch_id) {
                        flags |= IWL_SCAN_ADWELL_N_APS_GO_FRIENDLY_BIT;
                        break;
                }
        }

        if (flags)
                goto out;

        for (i = 0; i < ARRAY_SIZE(social_chs); i++) {
                if (social_chs[i] == ch_id) {
                        flags |= IWL_SCAN_ADWELL_N_APS_SOCIAL_CHS_BIT;
                        break;
                }
        }

out:
        return flags;
}

static void
iwl_mvm_umac_scan_cfg_channels(struct iwl_mvm *mvm,
                               struct ieee80211_channel **channels,
                               int n_channels, u32 flags,
                               struct iwl_scan_channel_cfg_umac *channel_cfg)
{
        int i;

        for (i = 0; i < n_channels; i++) {
                channel_cfg[i].flags = cpu_to_le32(flags);
                channel_cfg[i].v1.channel_num = channels[i]->hw_value;
                if (iwl_mvm_is_scan_ext_chan_supported(mvm)) {
                        enum nl80211_band band = channels[i]->band;

                        channel_cfg[i].v2.band =
                                iwl_mvm_phy_band_from_nl80211(band);
                        channel_cfg[i].v2.iter_count = 1;
                        channel_cfg[i].v2.iter_interval = 0;
                } else {
                        channel_cfg[i].v1.iter_count = 1;
                        channel_cfg[i].v1.iter_interval = 0;
                }
        }
}

static void
iwl_mvm_umac_scan_cfg_channels_v4(struct iwl_mvm *mvm,
                                  struct ieee80211_channel **channels,
                                  struct iwl_scan_channel_params_v4 *cp,
                                  int n_channels, u32 flags,
                                  enum nl80211_iftype vif_type)
{
        u8 *bitmap = cp->adwell_ch_override_bitmap;
        size_t bitmap_n_entries = ARRAY_SIZE(cp->adwell_ch_override_bitmap);
        int i;

        for (i = 0; i < n_channels; i++) {
                enum nl80211_band band = channels[i]->band;
                struct iwl_scan_channel_cfg_umac *cfg =
                        &cp->channel_config[i];

                cfg->flags = cpu_to_le32(flags);
                cfg->v2.channel_num = channels[i]->hw_value;
                cfg->v2.band = iwl_mvm_phy_band_from_nl80211(band);
                cfg->v2.iter_count = 1;
                cfg->v2.iter_interval = 0;

                iwl_mvm_scan_ch_add_n_aps_override(vif_type,
                                                   cfg->v2.channel_num,
                                                   cfg->v2.band, bitmap,
                                                   bitmap_n_entries);
        }
}

static void
iwl_mvm_umac_scan_cfg_channels_v6(struct iwl_mvm *mvm,
                                  struct ieee80211_channel **channels,
                                  struct iwl_scan_channel_params_v6 *cp,
                                  int n_channels, u32 flags,
                                  enum nl80211_iftype vif_type)
{
        int i;

        for (i = 0; i < n_channels; i++) {
                enum nl80211_band band = channels[i]->band;
                struct iwl_scan_channel_cfg_umac *cfg = &cp->channel_config[i];
                u32 n_aps_flag =
                        iwl_mvm_scan_ch_n_aps_flag(vif_type,
                                                   cfg->v2.channel_num);

                cfg->flags = cpu_to_le32(flags | n_aps_flag);
                cfg->v2.channel_num = channels[i]->hw_value;
                cfg->v2.band = iwl_mvm_phy_band_from_nl80211(band);
                if (cfg80211_channel_is_psc(channels[i]))
                        cfg->flags = 0;
                cfg->v2.iter_count = 1;
                cfg->v2.iter_interval = 0;
        }
}

static int
iwl_mvm_umac_scan_fill_6g_chan_list(struct iwl_mvm_scan_params *params,
                                    __le32 *cmd_short_ssid, u8 *cmd_bssid,
                                    u8 *scan_ssid_num, u8 *bssid_num)
{
        int j, idex_s = 0, idex_b = 0;
        struct cfg80211_scan_6ghz_params *scan_6ghz_params =
                params->scan_6ghz_params;

        if (!params->n_6ghz_params) {
                for (j = 0; j < params->n_ssids; j++) {
                        cmd_short_ssid[idex_s++] =
                                cpu_to_le32(~crc32_le(~0, params->ssids[j].ssid,
                                                      params->ssids[j].ssid_len));
                        (*scan_ssid_num)++;
                }
                return 0;
        }

        /*
         * Populate the arrays of the short SSIDs and the BSSIDs using the 6GHz
         * collocated parameters. This might not be optimal, as this processing
         * does not (yet) correspond to the actual channels, so it is possible
         * that some entries would be left out.
         *
         * TODO: improve this logic.
         */
        for (j = 0; j < params->n_6ghz_params; j++) {
                int k;

                /* First, try to place the short SSID */
                if (scan_6ghz_params[j].short_ssid_valid) {
                        for (k = 0; k < idex_s; k++) {
                                if (cmd_short_ssid[k] ==
                                    cpu_to_le32(scan_6ghz_params[j].short_ssid))
                                        break;
                        }

                        if (k == idex_s && idex_s < SCAN_SHORT_SSID_MAX_SIZE) {
                                cmd_short_ssid[idex_s++] =
                                        cpu_to_le32(scan_6ghz_params[j].short_ssid);
                                (*scan_ssid_num)++;
                        }
                }

                /* try to place BSSID for the same entry */
                for (k = 0; k < idex_b; k++) {
                        if (!memcmp(&cmd_bssid[ETH_ALEN * k],
                                    scan_6ghz_params[j].bssid, ETH_ALEN))
                                break;
                }

                if (k == idex_b && idex_b < SCAN_BSSID_MAX_SIZE) {
                        memcpy(&cmd_bssid[ETH_ALEN * idex_b++],
                               scan_6ghz_params[j].bssid, ETH_ALEN);
                        (*bssid_num)++;
                }
        }
        return 0;
}

/* TODO: this function can be merged with iwl_mvm_scan_umac_fill_ch_p_v6 */
static void
iwl_mvm_umac_scan_cfg_channels_v6_6g(struct iwl_mvm_scan_params *params,
                                     u32 n_channels, __le32 *cmd_short_ssid,
                                     u8 *cmd_bssid, u8 scan_ssid_num,
                                     u8 bssid_num,
                                     struct iwl_scan_channel_params_v6 *cp,
                                     enum nl80211_iftype vif_type)
{
        struct iwl_scan_channel_cfg_umac *channel_cfg = cp->channel_config;
        int i;
        struct cfg80211_scan_6ghz_params *scan_6ghz_params =
                params->scan_6ghz_params;

        for (i = 0; i < params->n_channels; i++) {
                struct iwl_scan_channel_cfg_umac *cfg =
                        &cp->channel_config[i];

                u32 s_ssid_bitmap = 0, bssid_bitmap = 0, flags = 0;
                u8 j, k, s_max = 0, b_max = 0, n_used_bssid_entries;
                bool force_passive, found = false,
                     unsolicited_probe_on_chan = false, psc_no_listen = false;

                cfg->v1.channel_num = params->channels[i]->hw_value;
                cfg->v2.band = 2;
                cfg->v2.iter_count = 1;
                cfg->v2.iter_interval = 0;

                /*
                 * The optimize the scan time, i.e., reduce the scan dwell time
                 * on each channel, the below logic tries to set 3 direct BSSID
                 * probe requests for each broadcast probe request with a short
                 * SSID.
                 * TODO: improve this logic
                 */
                n_used_bssid_entries = 3;
                for (j = 0; j < params->n_6ghz_params; j++) {
                        if (!(scan_6ghz_params[j].channel_idx == i))
                                continue;

                        found = false;
                        unsolicited_probe_on_chan |=
                                scan_6ghz_params[j].unsolicited_probe;
                        psc_no_listen |= scan_6ghz_params[j].psc_no_listen;

                        for (k = 0; k < scan_ssid_num; k++) {
                                if (!scan_6ghz_params[j].unsolicited_probe &&
                                    le32_to_cpu(cmd_short_ssid[k]) ==
                                    scan_6ghz_params[j].short_ssid) {
                                        /* Relevant short SSID bit set */
                                        if (s_ssid_bitmap & BIT(k)) {
                                                found = true;
                                                break;
                                        }

                                        /*
                                         * Use short SSID only to create a new
                                         * iteration during channel dwell.
                                         */
                                        if (n_used_bssid_entries >= 3) {
                                                s_ssid_bitmap |= BIT(k);
                                                s_max++;
                                                n_used_bssid_entries -= 3;
                                                found = true;
                                                break;
                                        }
                                }
                        }

                        if (found)
                                continue;

                        for (k = 0; k < bssid_num; k++) {
                                if (!memcmp(&cmd_bssid[ETH_ALEN * k],
                                            scan_6ghz_params[j].bssid,
                                            ETH_ALEN)) {
                                        if (!(bssid_bitmap & BIT(k))) {
                                                bssid_bitmap |= BIT(k);
                                                b_max++;
                                                n_used_bssid_entries++;
                                        }
                                        break;
                                }
                        }
                }

                flags = bssid_bitmap | (s_ssid_bitmap << 16);

                if (cfg80211_channel_is_psc(params->channels[i]) &&
                    psc_no_listen)
                        flags |= IWL_UHB_CHAN_CFG_FLAG_PSC_CHAN_NO_LISTEN;

                if (unsolicited_probe_on_chan)
                        flags |= IWL_UHB_CHAN_CFG_FLAG_UNSOLICITED_PROBE_RES;

                /*
                 * In the following cases apply passive scan:
                 * 1. Non fragmented scan:
                 *      - PSC channel with NO_LISTEN_FLAG on should be treated
                 *        like non PSC channel
                 *      - Non PSC channel with more than 3 short SSIDs or more
                 *        than 9 BSSIDs.
                 *      - Non PSC Channel with unsolicited probe response and
                 *        more than 2 short SSIDs or more than 6 BSSIDs.
                 *      - PSC channel with more than 2 short SSIDs or more than
                 *        6 BSSIDs.
                 * 3. Fragmented scan:
                 *      - PSC channel with more than 1 SSID or 3 BSSIDs.
                 *      - Non PSC channel with more than 2 SSIDs or 6 BSSIDs.
                 *      - Non PSC channel with unsolicited probe response and
                 *        more than 1 SSID or more than 3 BSSIDs.
                 */
                if (!iwl_mvm_is_scan_fragmented(params->type)) {
                        if (!cfg80211_channel_is_psc(params->channels[i]) ||
                            flags & IWL_UHB_CHAN_CFG_FLAG_PSC_CHAN_NO_LISTEN) {
                                force_passive = (s_max > 3 || b_max > 9);
                                force_passive |= (unsolicited_probe_on_chan &&
                                                  (s_max > 2 || b_max > 6));
                        } else {
                                force_passive = (s_max > 2 || b_max > 6);
                        }
                } else if (cfg80211_channel_is_psc(params->channels[i])) {
                        force_passive = (s_max > 1 || b_max > 3);
                } else {
                        force_passive = (s_max > 2 || b_max > 6);
                        force_passive |= (unsolicited_probe_on_chan &&
                                          (s_max > 1 || b_max > 3));
                }
                if (force_passive ||
                    (!flags && !cfg80211_channel_is_psc(params->channels[i])))
                        flags |= IWL_UHB_CHAN_CFG_FLAG_FORCE_PASSIVE;

                channel_cfg[i].flags |= cpu_to_le32(flags);
        }
}

static u8 iwl_mvm_scan_umac_chan_flags_v2(struct iwl_mvm *mvm,
                                          struct iwl_mvm_scan_params *params,
                                          struct ieee80211_vif *vif)
{
        u8 flags = 0;

        flags |= IWL_SCAN_CHANNEL_FLAG_ENABLE_CHAN_ORDER;

        if (iwl_mvm_scan_use_ebs(mvm, vif))
                flags |= IWL_SCAN_CHANNEL_FLAG_EBS |
                        IWL_SCAN_CHANNEL_FLAG_EBS_ACCURATE |
                        IWL_SCAN_CHANNEL_FLAG_CACHE_ADD;

        /* set fragmented ebs for fragmented scan on HB channels */
        if (iwl_mvm_is_scan_fragmented(params->hb_type))
                flags |= IWL_SCAN_CHANNEL_FLAG_EBS_FRAG;

        return flags;
}

static u16 iwl_mvm_scan_umac_flags_v2(struct iwl_mvm *mvm,
                                      struct iwl_mvm_scan_params *params,
                                      struct ieee80211_vif *vif,
                                      int type)
{
        u16 flags = 0;

        if (params->n_ssids == 0)
                flags |= IWL_UMAC_SCAN_GEN_FLAGS_V2_FORCE_PASSIVE;

        if (iwl_mvm_is_scan_fragmented(params->type))
                flags |= IWL_UMAC_SCAN_GEN_FLAGS_V2_FRAGMENTED_LMAC1;

        if (iwl_mvm_is_scan_fragmented(params->hb_type))
                flags |= IWL_UMAC_SCAN_GEN_FLAGS_V2_FRAGMENTED_LMAC2;

        if (params->pass_all)
                flags |= IWL_UMAC_SCAN_GEN_FLAGS_V2_PASS_ALL;
        else
                flags |= IWL_UMAC_SCAN_GEN_FLAGS_V2_MATCH;

        if (!iwl_mvm_is_regular_scan(params))
                flags |= IWL_UMAC_SCAN_GEN_FLAGS_V2_PERIODIC;

        if (params->iter_notif ||
            mvm->sched_scan_pass_all == SCHED_SCAN_PASS_ALL_ENABLED)
                flags |= IWL_UMAC_SCAN_GEN_FLAGS_V2_NTFY_ITER_COMPLETE;

        if (IWL_MVM_ADWELL_ENABLE)
                flags |= IWL_UMAC_SCAN_GEN_FLAGS_V2_ADAPTIVE_DWELL;

        if (type == IWL_MVM_SCAN_SCHED || type == IWL_MVM_SCAN_NETDETECT)
                flags |= IWL_UMAC_SCAN_GEN_FLAGS_V2_PREEMPTIVE;

        if ((type == IWL_MVM_SCAN_SCHED || type == IWL_MVM_SCAN_NETDETECT) &&
            params->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ)
                flags |= IWL_UMAC_SCAN_GEN_FLAGS_V2_TRIGGER_UHB_SCAN;

        return flags;
}

static u16 iwl_mvm_scan_umac_flags(struct iwl_mvm *mvm,
                                   struct iwl_mvm_scan_params *params,
                                   struct ieee80211_vif *vif)
{
        u16 flags = 0;

        if (params->n_ssids == 0)
                flags = IWL_UMAC_SCAN_GEN_FLAGS_PASSIVE;

        if (params->n_ssids == 1 && params->ssids[0].ssid_len != 0)
                flags |= IWL_UMAC_SCAN_GEN_FLAGS_PRE_CONNECT;

        if (iwl_mvm_is_scan_fragmented(params->type))
                flags |= IWL_UMAC_SCAN_GEN_FLAGS_FRAGMENTED;

        if (iwl_mvm_is_cdb_supported(mvm) &&
            iwl_mvm_is_scan_fragmented(params->hb_type))
                flags |= IWL_UMAC_SCAN_GEN_FLAGS_LMAC2_FRAGMENTED;

        if (iwl_mvm_rrm_scan_needed(mvm) &&
            fw_has_capa(&mvm->fw->ucode_capa,
                        IWL_UCODE_TLV_CAPA_WFA_TPC_REP_IE_SUPPORT))
                flags |= IWL_UMAC_SCAN_GEN_FLAGS_RRM_ENABLED;

        if (params->pass_all)
                flags |= IWL_UMAC_SCAN_GEN_FLAGS_PASS_ALL;
        else
                flags |= IWL_UMAC_SCAN_GEN_FLAGS_MATCH;

        if (!iwl_mvm_is_regular_scan(params))
                flags |= IWL_UMAC_SCAN_GEN_FLAGS_PERIODIC;

        if (params->iter_notif)
                flags |= IWL_UMAC_SCAN_GEN_FLAGS_ITER_COMPLETE;

#ifdef CONFIG_IWLWIFI_DEBUGFS
        if (mvm->scan_iter_notif_enabled)
                flags |= IWL_UMAC_SCAN_GEN_FLAGS_ITER_COMPLETE;
#endif

        if (mvm->sched_scan_pass_all == SCHED_SCAN_PASS_ALL_ENABLED)
                flags |= IWL_UMAC_SCAN_GEN_FLAGS_ITER_COMPLETE;

        if (iwl_mvm_is_adaptive_dwell_supported(mvm) && IWL_MVM_ADWELL_ENABLE)
                flags |= IWL_UMAC_SCAN_GEN_FLAGS_ADAPTIVE_DWELL;

        /*
         * Extended dwell is relevant only for low band to start with, as it is
         * being used for social channles only (1, 6, 11), so we can check
         * only scan type on low band also for CDB.
         */
        if (iwl_mvm_is_regular_scan(params) &&
            vif->type != NL80211_IFTYPE_P2P_DEVICE &&
            !iwl_mvm_is_scan_fragmented(params->type) &&
            !iwl_mvm_is_adaptive_dwell_supported(mvm) &&
            !iwl_mvm_is_oce_supported(mvm))
                flags |= IWL_UMAC_SCAN_GEN_FLAGS_EXTENDED_DWELL;

        if (iwl_mvm_is_oce_supported(mvm)) {
                if ((params->flags &
                     NL80211_SCAN_FLAG_OCE_PROBE_REQ_HIGH_TX_RATE))
                        flags |= IWL_UMAC_SCAN_GEN_FLAGS_PROB_REQ_HIGH_TX_RATE;
                /* Since IWL_UMAC_SCAN_GEN_FLAGS_EXTENDED_DWELL and
                 * NL80211_SCAN_FLAG_OCE_PROBE_REQ_DEFERRAL_SUPPRESSION shares
                 * the same bit, we need to make sure that we use this bit here
                 * only when IWL_UMAC_SCAN_GEN_FLAGS_EXTENDED_DWELL cannot be
                 * used. */
                if ((params->flags &
                     NL80211_SCAN_FLAG_OCE_PROBE_REQ_DEFERRAL_SUPPRESSION) &&
                     !WARN_ON_ONCE(!iwl_mvm_is_adaptive_dwell_supported(mvm)))
                        flags |= IWL_UMAC_SCAN_GEN_FLAGS_PROB_REQ_DEFER_SUPP;
                if ((params->flags & NL80211_SCAN_FLAG_FILS_MAX_CHANNEL_TIME))
                        flags |= IWL_UMAC_SCAN_GEN_FLAGS_MAX_CHNL_TIME;
        }

        return flags;
}

static int
iwl_mvm_fill_scan_sched_params(struct iwl_mvm_scan_params *params,
                               struct iwl_scan_umac_schedule *schedule,
                               __le16 *delay)
{
        int i;

        if (WARN_ON(!params->n_scan_plans ||
                    params->n_scan_plans > IWL_MAX_SCHED_SCAN_PLANS))
                return -EINVAL;

        for (i = 0; i < params->n_scan_plans; i++) {
                struct cfg80211_sched_scan_plan *scan_plan =
                        &params->scan_plans[i];

                schedule[i].iter_count = scan_plan->iterations;
                schedule[i].interval =
                        cpu_to_le16(scan_plan->interval);
        }

        /*
         * If the number of iterations of the last scan plan is set to
         * zero, it should run infinitely. However, this is not always the case.
         * For example, when regular scan is requested the driver sets one scan
         * plan with one iteration.
         */
        if (!schedule[params->n_scan_plans - 1].iter_count)
                schedule[params->n_scan_plans - 1].iter_count = 0xff;

        *delay = cpu_to_le16(params->delay);

        return 0;
}

static int iwl_mvm_scan_umac(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
                             struct iwl_mvm_scan_params *params,
                             int type, int uid)
{
        struct iwl_scan_req_umac *cmd = mvm->scan_cmd;
        struct iwl_scan_umac_chan_param *chan_param;
        void *cmd_data = iwl_mvm_get_scan_req_umac_data(mvm);
        void *sec_part = cmd_data + sizeof(struct iwl_scan_channel_cfg_umac) *
                mvm->fw->ucode_capa.n_scan_channels;
        struct iwl_scan_req_umac_tail_v2 *tail_v2 =
                (struct iwl_scan_req_umac_tail_v2 *)sec_part;
        struct iwl_scan_req_umac_tail_v1 *tail_v1;
        struct iwl_ssid_ie *direct_scan;
        int ret = 0;
        u32 ssid_bitmap = 0;
        u8 channel_flags = 0;
        u16 gen_flags;
        struct iwl_mvm_vif *scan_vif = iwl_mvm_vif_from_mac80211(vif);

        chan_param = iwl_mvm_get_scan_req_umac_channel(mvm);

        iwl_mvm_scan_umac_dwell(mvm, cmd, params);

        mvm->scan_uid_status[uid] = type;

        cmd->uid = cpu_to_le32(uid);
        gen_flags = iwl_mvm_scan_umac_flags(mvm, params, vif);
        cmd->general_flags = cpu_to_le16(gen_flags);
        if (iwl_mvm_is_adaptive_dwell_v2_supported(mvm)) {
                if (gen_flags & IWL_UMAC_SCAN_GEN_FLAGS_FRAGMENTED)
                        cmd->v8.num_of_fragments[SCAN_LB_LMAC_IDX] =
                                                        IWL_SCAN_NUM_OF_FRAGS;
                if (gen_flags & IWL_UMAC_SCAN_GEN_FLAGS_LMAC2_FRAGMENTED)
                        cmd->v8.num_of_fragments[SCAN_HB_LMAC_IDX] =
                                                        IWL_SCAN_NUM_OF_FRAGS;

                cmd->v8.general_flags2 =
                        IWL_UMAC_SCAN_GEN_FLAGS2_ALLOW_CHNL_REORDER;
        }

        cmd->scan_start_mac_id = scan_vif->id;

        if (type == IWL_MVM_SCAN_SCHED || type == IWL_MVM_SCAN_NETDETECT)
                cmd->flags = cpu_to_le32(IWL_UMAC_SCAN_FLAG_PREEMPTIVE);

        if (iwl_mvm_scan_use_ebs(mvm, vif)) {
                channel_flags = IWL_SCAN_CHANNEL_FLAG_EBS |
                                IWL_SCAN_CHANNEL_FLAG_EBS_ACCURATE |
                                IWL_SCAN_CHANNEL_FLAG_CACHE_ADD;

                /* set fragmented ebs for fragmented scan on HB channels */
                if (iwl_mvm_is_frag_ebs_supported(mvm)) {
                        if (gen_flags &
                            IWL_UMAC_SCAN_GEN_FLAGS_LMAC2_FRAGMENTED ||
                            (!iwl_mvm_is_cdb_supported(mvm) &&
                             gen_flags & IWL_UMAC_SCAN_GEN_FLAGS_FRAGMENTED))
                                channel_flags |= IWL_SCAN_CHANNEL_FLAG_EBS_FRAG;
                }
        }

        chan_param->flags = channel_flags;
        chan_param->count = params->n_channels;

        ret = iwl_mvm_fill_scan_sched_params(params, tail_v2->schedule,
                                             &tail_v2->delay);
        if (ret) {
                mvm->scan_uid_status[uid] = 0;
                return ret;
        }

        if (iwl_mvm_is_scan_ext_chan_supported(mvm)) {
                tail_v2->preq = params->preq;
                direct_scan = tail_v2->direct_scan;
        } else {
                tail_v1 = (struct iwl_scan_req_umac_tail_v1 *)sec_part;
                iwl_mvm_scan_set_legacy_probe_req(&tail_v1->preq,
                                                  &params->preq);
                direct_scan = tail_v1->direct_scan;
        }
        iwl_scan_build_ssids(params, direct_scan, &ssid_bitmap);
        iwl_mvm_umac_scan_cfg_channels(mvm, params->channels,
                                       params->n_channels, ssid_bitmap,
                                       cmd_data);
        return 0;
}

static void
iwl_mvm_scan_umac_fill_general_p_v10(struct iwl_mvm *mvm,
                                     struct iwl_mvm_scan_params *params,
                                     struct ieee80211_vif *vif,
                                     struct iwl_scan_general_params_v10 *gp,
                                     u16 gen_flags)
{
        struct iwl_mvm_vif *scan_vif = iwl_mvm_vif_from_mac80211(vif);

        iwl_mvm_scan_umac_dwell_v10(mvm, gp, params);

        gp->flags = cpu_to_le16(gen_flags);

        if (gen_flags & IWL_UMAC_SCAN_GEN_FLAGS_V2_FRAGMENTED_LMAC1)
                gp->num_of_fragments[SCAN_LB_LMAC_IDX] = IWL_SCAN_NUM_OF_FRAGS;
        if (gen_flags & IWL_UMAC_SCAN_GEN_FLAGS_V2_FRAGMENTED_LMAC2)
                gp->num_of_fragments[SCAN_HB_LMAC_IDX] = IWL_SCAN_NUM_OF_FRAGS;

        gp->scan_start_mac_id = scan_vif->id;
}

static void
iwl_mvm_scan_umac_fill_probe_p_v3(struct iwl_mvm_scan_params *params,
                                  struct iwl_scan_probe_params_v3 *pp)
{
        pp->preq = params->preq;
        pp->ssid_num = params->n_ssids;
        iwl_scan_build_ssids(params, pp->direct_scan, NULL);
}

static void
iwl_mvm_scan_umac_fill_probe_p_v4(struct iwl_mvm_scan_params *params,
                                  struct iwl_scan_probe_params_v4 *pp,
                                  u32 *bitmap_ssid)
{
        pp->preq = params->preq;
        iwl_scan_build_ssids(params, pp->direct_scan, bitmap_ssid);
}

static void
iwl_mvm_scan_umac_fill_ch_p_v4(struct iwl_mvm *mvm,
                               struct iwl_mvm_scan_params *params,
                               struct ieee80211_vif *vif,
                               struct iwl_scan_channel_params_v4 *cp,
                               u32 channel_cfg_flags)
{
        cp->flags = iwl_mvm_scan_umac_chan_flags_v2(mvm, params, vif);
        cp->count = params->n_channels;
        cp->num_of_aps_override = IWL_SCAN_ADWELL_N_APS_GO_FRIENDLY;

        iwl_mvm_umac_scan_cfg_channels_v4(mvm, params->channels, cp,
                                          params->n_channels,
                                          channel_cfg_flags,
                                          vif->type);
}

static void
iwl_mvm_scan_umac_fill_ch_p_v6(struct iwl_mvm *mvm,
                               struct iwl_mvm_scan_params *params,
                               struct ieee80211_vif *vif,
                               struct iwl_scan_channel_params_v6 *cp,
                               u32 channel_cfg_flags)
{
        cp->flags = iwl_mvm_scan_umac_chan_flags_v2(mvm, params, vif);
        cp->count = params->n_channels;
        cp->n_aps_override[0] = IWL_SCAN_ADWELL_N_APS_GO_FRIENDLY;
        cp->n_aps_override[1] = IWL_SCAN_ADWELL_N_APS_SOCIAL_CHS;

        iwl_mvm_umac_scan_cfg_channels_v6(mvm, params->channels, cp,
                                          params->n_channels,
                                          channel_cfg_flags,
                                          vif->type);
}

static int iwl_mvm_scan_umac_v12(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
                                 struct iwl_mvm_scan_params *params, int type,
                                 int uid)
{
        struct iwl_scan_req_umac_v12 *cmd = mvm->scan_cmd;
        struct iwl_scan_req_params_v12 *scan_p = &cmd->scan_params;
        int ret;
        u16 gen_flags;

        mvm->scan_uid_status[uid] = type;

        cmd->ooc_priority = cpu_to_le32(iwl_mvm_scan_umac_ooc_priority(params));
        cmd->uid = cpu_to_le32(uid);

        gen_flags = iwl_mvm_scan_umac_flags_v2(mvm, params, vif, type);
        iwl_mvm_scan_umac_fill_general_p_v10(mvm, params, vif,
                                             &scan_p->general_params,
                                             gen_flags);

         ret = iwl_mvm_fill_scan_sched_params(params,
                                              scan_p->periodic_params.schedule,
                                              &scan_p->periodic_params.delay);
        if (ret)
                return ret;

        iwl_mvm_scan_umac_fill_probe_p_v3(params, &scan_p->probe_params);
        iwl_mvm_scan_umac_fill_ch_p_v4(mvm, params, vif,
                                       &scan_p->channel_params, 0);

        return 0;
}

static int iwl_mvm_scan_umac_v14(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
                                 struct iwl_mvm_scan_params *params, int type,
                                 int uid)
{
        struct iwl_scan_req_umac_v14 *cmd = mvm->scan_cmd;
        struct iwl_scan_req_params_v14 *scan_p = &cmd->scan_params;
        struct iwl_scan_channel_params_v6 *cp = &scan_p->channel_params;
        struct iwl_scan_probe_params_v4 *pb = &scan_p->probe_params;
        int ret;
        u16 gen_flags;
        u32 bitmap_ssid = 0;

        mvm->scan_uid_status[uid] = type;

        cmd->ooc_priority = cpu_to_le32(iwl_mvm_scan_umac_ooc_priority(params));
        cmd->uid = cpu_to_le32(uid);

        gen_flags = iwl_mvm_scan_umac_flags_v2(mvm, params, vif, type);
        iwl_mvm_scan_umac_fill_general_p_v10(mvm, params, vif,
                                             &scan_p->general_params,
                                             gen_flags);

         ret = iwl_mvm_fill_scan_sched_params(params,
                                              scan_p->periodic_params.schedule,
                                              &scan_p->periodic_params.delay);
        if (ret)
                return ret;

        iwl_mvm_scan_umac_fill_probe_p_v4(params, &scan_p->probe_params,
                                          &bitmap_ssid);
        if (!params->scan_6ghz) {
                iwl_mvm_scan_umac_fill_ch_p_v6(mvm, params, vif,
                                               &scan_p->channel_params, bitmap_ssid);

                return 0;
        }
        cp->flags = iwl_mvm_scan_umac_chan_flags_v2(mvm, params, vif);
        cp->n_aps_override[0] = IWL_SCAN_ADWELL_N_APS_GO_FRIENDLY;
        cp->n_aps_override[1] = IWL_SCAN_ADWELL_N_APS_SOCIAL_CHS;

        ret = iwl_mvm_umac_scan_fill_6g_chan_list(params, pb->short_ssid,
                                                  pb->bssid_array[0],
                                                  &pb->short_ssid_num,
                                                  &pb->bssid_num);
        if (ret)
                return ret;

        iwl_mvm_umac_scan_cfg_channels_v6_6g(params,
                                             params->n_channels,
                                             pb->short_ssid,
                                             pb->bssid_array[0],
                                             pb->short_ssid_num,
                                             pb->bssid_num, cp,
                                             vif->type);
        cp->count = params->n_channels;
        if (!params->n_ssids ||
            (params->n_ssids == 1 && !params->ssids[0].ssid_len))
                cp->flags |= IWL_SCAN_CHANNEL_FLAG_6G_PSC_NO_FILTER;

        return 0;
}

static int iwl_mvm_num_scans(struct iwl_mvm *mvm)
{
        return hweight32(mvm->scan_status & IWL_MVM_SCAN_MASK);
}

static int iwl_mvm_check_running_scans(struct iwl_mvm *mvm, int type)
{
        bool unified_image = fw_has_capa(&mvm->fw->ucode_capa,
                                         IWL_UCODE_TLV_CAPA_CNSLDTD_D3_D0_IMG);

        /* This looks a bit arbitrary, but the idea is that if we run
         * out of possible simultaneous scans and the userspace is
         * trying to run a scan type that is already running, we
         * return -EBUSY.  But if the userspace wants to start a
         * different type of scan, we stop the opposite type to make
         * space for the new request.  The reason is backwards
         * compatibility with old wpa_supplicant that wouldn't stop a
         * scheduled scan before starting a normal scan.
         */

        /* FW supports only a single periodic scan */
        if ((type == IWL_MVM_SCAN_SCHED || type == IWL_MVM_SCAN_NETDETECT) &&
            mvm->scan_status & (IWL_MVM_SCAN_SCHED | IWL_MVM_SCAN_NETDETECT))
                return -EBUSY;

        if (iwl_mvm_num_scans(mvm) < mvm->max_scans)
                return 0;

        /* Use a switch, even though this is a bitmask, so that more
         * than one bits set will fall in default and we will warn.
         */
        switch (type) {
        case IWL_MVM_SCAN_REGULAR:
                if (mvm->scan_status & IWL_MVM_SCAN_REGULAR_MASK)
                        return -EBUSY;
                return iwl_mvm_scan_stop(mvm, IWL_MVM_SCAN_SCHED, true);
        case IWL_MVM_SCAN_SCHED:
                if (mvm->scan_status & IWL_MVM_SCAN_SCHED_MASK)
                        return -EBUSY;
                return iwl_mvm_scan_stop(mvm, IWL_MVM_SCAN_REGULAR, true);
        case IWL_MVM_SCAN_NETDETECT:
                /* For non-unified images, there's no need to stop
                 * anything for net-detect since the firmware is
                 * restarted anyway.  This way, any sched scans that
                 * were running will be restarted when we resume.
                 */
                if (!unified_image)
                        return 0;

                /* If this is a unified image and we ran out of scans,
                 * we need to stop something.  Prefer stopping regular
                 * scans, because the results are useless at this
                 * point, and we should be able to keep running
                 * another scheduled scan while suspended.
                 */
                if (mvm->scan_status & IWL_MVM_SCAN_REGULAR_MASK)
                        return iwl_mvm_scan_stop(mvm, IWL_MVM_SCAN_REGULAR,
                                                 true);
                if (mvm->scan_status & IWL_MVM_SCAN_SCHED_MASK)
                        return iwl_mvm_scan_stop(mvm, IWL_MVM_SCAN_SCHED,
                                                 true);
                /* Something is wrong if no scan was running but we
                 * ran out of scans.
                 */
                fallthrough;
        default:
                WARN_ON(1);
                break;
        }

        return -EIO;
}

#define SCAN_TIMEOUT 20000

void iwl_mvm_scan_timeout_wk(struct work_struct *work)
{
        struct delayed_work *delayed_work = to_delayed_work(work);
        struct iwl_mvm *mvm = container_of(delayed_work, struct iwl_mvm,
                                           scan_timeout_dwork);

        IWL_ERR(mvm, "regular scan timed out\n");

        iwl_force_nmi(mvm->trans);
}

static void iwl_mvm_fill_scan_type(struct iwl_mvm *mvm,
                                   struct iwl_mvm_scan_params *params,
                                   struct ieee80211_vif *vif)
{
        if (iwl_mvm_is_cdb_supported(mvm)) {
                params->type =
                        iwl_mvm_get_scan_type_band(mvm, vif,
                                                   NL80211_BAND_2GHZ);
                params->hb_type =
                        iwl_mvm_get_scan_type_band(mvm, vif,
                                                   NL80211_BAND_5GHZ);
        } else {
                params->type = iwl_mvm_get_scan_type(mvm, vif);
        }
}

struct iwl_scan_umac_handler {
        u8 version;
        int (*handler)(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
                       struct iwl_mvm_scan_params *params, int type, int uid);
};

#define IWL_SCAN_UMAC_HANDLER(_ver) {           \
        .version = _ver,                        \
        .handler = iwl_mvm_scan_umac_v##_ver,   \
}

static const struct iwl_scan_umac_handler iwl_scan_umac_handlers[] = {
        /* set the newest version first to shorten the list traverse time */
        IWL_SCAN_UMAC_HANDLER(14),
        IWL_SCAN_UMAC_HANDLER(12),
};

static int iwl_mvm_build_scan_cmd(struct iwl_mvm *mvm,
                                  struct ieee80211_vif *vif,
                                  struct iwl_host_cmd *hcmd,
                                  struct iwl_mvm_scan_params *params,
                                  int type)
{
        int uid, i, err;
        u8 scan_ver;

        lockdep_assert_held(&mvm->mutex);
        memset(mvm->scan_cmd, 0, ksize(mvm->scan_cmd));

        if (!fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_UMAC_SCAN)) {
                hcmd->id = SCAN_OFFLOAD_REQUEST_CMD;

                return iwl_mvm_scan_lmac(mvm, vif, params);
        }

        uid = iwl_mvm_scan_uid_by_status(mvm, 0);
        if (uid < 0)
                return uid;

        hcmd->id = iwl_cmd_id(SCAN_REQ_UMAC, IWL_ALWAYS_LONG_GROUP, 0);

        scan_ver = iwl_fw_lookup_cmd_ver(mvm->fw, IWL_ALWAYS_LONG_GROUP,
                                         SCAN_REQ_UMAC,
                                         IWL_FW_CMD_VER_UNKNOWN);

        for (i = 0; i < ARRAY_SIZE(iwl_scan_umac_handlers); i++) {
                const struct iwl_scan_umac_handler *ver_handler =
                        &iwl_scan_umac_handlers[i];

                if (ver_handler->version != scan_ver)
                        continue;

                return ver_handler->handler(mvm, vif, params, type, uid);
        }

        err = iwl_mvm_scan_umac(mvm, vif, params, type, uid);
        if (err)
                return err;

        return uid;
}

int iwl_mvm_reg_scan_start(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
                           struct cfg80211_scan_request *req,
                           struct ieee80211_scan_ies *ies)
{
        struct iwl_host_cmd hcmd = {
                .len = { iwl_mvm_scan_size(mvm), },
                .data = { mvm->scan_cmd, },
                .dataflags = { IWL_HCMD_DFL_NOCOPY, },
        };
        struct iwl_mvm_scan_params params = {};
        int ret, uid;
        struct cfg80211_sched_scan_plan scan_plan = { .iterations = 1 };

        lockdep_assert_held(&mvm->mutex);

        if (iwl_mvm_is_lar_supported(mvm) && !mvm->lar_regdom_set) {
                IWL_ERR(mvm, "scan while LAR regdomain is not set\n");
                return -EBUSY;
        }

        ret = iwl_mvm_check_running_scans(mvm, IWL_MVM_SCAN_REGULAR);
        if (ret)
                return ret;

        /* we should have failed registration if scan_cmd was NULL */
        if (WARN_ON(!mvm->scan_cmd))
                return -ENOMEM;

        if (!iwl_mvm_scan_fits(mvm, req->n_ssids, ies, req->n_channels))
                return -ENOBUFS;

        params.n_ssids = req->n_ssids;
        params.flags = req->flags;
        params.n_channels = req->n_channels;
        params.delay = 0;
        params.ssids = req->ssids;
        params.channels = req->channels;
        params.mac_addr = req->mac_addr;
        params.mac_addr_mask = req->mac_addr_mask;
        params.no_cck = req->no_cck;
        params.pass_all = true;
        params.n_match_sets = 0;
        params.match_sets = NULL;

        params.scan_plans = &scan_plan;
        params.n_scan_plans = 1;

        params.n_6ghz_params = req->n_6ghz_params;
        params.scan_6ghz_params = req->scan_6ghz_params;
        params.scan_6ghz = req->scan_6ghz;
        iwl_mvm_fill_scan_type(mvm, &params, vif);

        if (req->duration)
                params.iter_notif = true;

        iwl_mvm_build_scan_probe(mvm, vif, ies, &params);

        uid = iwl_mvm_build_scan_cmd(mvm, vif, &hcmd, &params,
                                     IWL_MVM_SCAN_REGULAR);

        if (uid < 0)
                return uid;

        iwl_mvm_pause_tcm(mvm, false);

        ret = iwl_mvm_send_cmd(mvm, &hcmd);
        if (ret) {
                /* If the scan failed, it usually means that the FW was unable
                 * to allocate the time events. Warn on it, but maybe we
                 * should try to send the command again with different params.
                 */
                IWL_ERR(mvm, "Scan failed! ret %d\n", ret);
                iwl_mvm_resume_tcm(mvm);
                mvm->scan_uid_status[uid] = 0;
                return ret;
        }

        IWL_DEBUG_SCAN(mvm, "Scan request was sent successfully\n");
        mvm->scan_status |= IWL_MVM_SCAN_REGULAR;
        mvm->scan_vif = iwl_mvm_vif_from_mac80211(vif);

        schedule_delayed_work(&mvm->scan_timeout_dwork,
                              msecs_to_jiffies(SCAN_TIMEOUT));

        return 0;
}

int iwl_mvm_sched_scan_start(struct iwl_mvm *mvm,
                             struct ieee80211_vif *vif,
                             struct cfg80211_sched_scan_request *req,
                             struct ieee80211_scan_ies *ies,
                             int type)
{
        struct iwl_host_cmd hcmd = {
                .len = { iwl_mvm_scan_size(mvm), },
                .data = { mvm->scan_cmd, },
                .dataflags = { IWL_HCMD_DFL_NOCOPY, },
        };
        struct iwl_mvm_scan_params params = {};
        int ret, uid;
        int i, j;
        bool non_psc_included = false;

        lockdep_assert_held(&mvm->mutex);

        if (iwl_mvm_is_lar_supported(mvm) && !mvm->lar_regdom_set) {
                IWL_ERR(mvm, "sched-scan while LAR regdomain is not set\n");
                return -EBUSY;
        }

        ret = iwl_mvm_check_running_scans(mvm, type);
        if (ret)
                return ret;

        /* we should have failed registration if scan_cmd was NULL */
        if (WARN_ON(!mvm->scan_cmd))
                return -ENOMEM;


        params.n_ssids = req->n_ssids;
        params.flags = req->flags;
        params.n_channels = req->n_channels;
        params.ssids = req->ssids;
        params.channels = req->channels;
        params.mac_addr = req->mac_addr;
        params.mac_addr_mask = req->mac_addr_mask;
        params.no_cck = false;
        params.pass_all =  iwl_mvm_scan_pass_all(mvm, req);
        params.n_match_sets = req->n_match_sets;
        params.match_sets = req->match_sets;
        if (!req->n_scan_plans)
                return -EINVAL;

        params.n_scan_plans = req->n_scan_plans;
        params.scan_plans = req->scan_plans;

        iwl_mvm_fill_scan_type(mvm, &params, vif);

        /* In theory, LMAC scans can handle a 32-bit delay, but since
         * waiting for over 18 hours to start the scan is a bit silly
         * and to keep it aligned with UMAC scans (which only support
         * 16-bit delays), trim it down to 16-bits.
         */
        if (req->delay > U16_MAX) {
                IWL_DEBUG_SCAN(mvm,
                               "delay value is > 16-bits, set to max possible\n");
                params.delay = U16_MAX;
        } else {
                params.delay = req->delay;
        }

        ret = iwl_mvm_config_sched_scan_profiles(mvm, req);
        if (ret)
                return ret;

        iwl_mvm_build_scan_probe(mvm, vif, ies, &params);

        /* for 6 GHZ band only PSC channels need to be added */
        for (i = 0; i < params.n_channels; i++) {
                struct ieee80211_channel *channel = params.channels[i];

                if (channel->band == NL80211_BAND_6GHZ &&
                    !cfg80211_channel_is_psc(channel)) {
                        non_psc_included = true;
                        break;
                }
        }

        if (non_psc_included) {
                params.channels = kmemdup(params.channels,
                                          sizeof(params.channels[0]) *
                                          params.n_channels,
                                          GFP_KERNEL);
                if (!params.channels)
                        return -ENOMEM;

                for (i = j = 0; i < params.n_channels; i++) {
                        if (params.channels[i]->band == NL80211_BAND_6GHZ &&
                            !cfg80211_channel_is_psc(params.channels[i]))
                                continue;
                        params.channels[j++] = params.channels[i];
                }
                params.n_channels = j;
        }

        if (non_psc_included &&
            !iwl_mvm_scan_fits(mvm, req->n_ssids, ies, params.n_channels)) {
                kfree(params.channels);
                return -ENOBUFS;
        }

        uid = iwl_mvm_build_scan_cmd(mvm, vif, &hcmd, &params, type);

        if (non_psc_included)
                kfree(params.channels);
        if (uid < 0)
                return uid;

        ret = iwl_mvm_send_cmd(mvm, &hcmd);
        if (!ret) {
                IWL_DEBUG_SCAN(mvm,
                               "Sched scan request was sent successfully\n");
                mvm->scan_status |= type;
        } else {
                /* If the scan failed, it usually means that the FW was unable
                 * to allocate the time events. Warn on it, but maybe we
                 * should try to send the command again with different params.
                 */
                IWL_ERR(mvm, "Sched scan failed! ret %d\n", ret);
                mvm->scan_uid_status[uid] = 0;
                mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_DISABLED;
        }

        return ret;
}

void iwl_mvm_rx_umac_scan_complete_notif(struct iwl_mvm *mvm,
                                         struct iwl_rx_cmd_buffer *rxb)
{
        struct iwl_rx_packet *pkt = rxb_addr(rxb);
        struct iwl_umac_scan_complete *notif = (void *)pkt->data;
        u32 uid = __le32_to_cpu(notif->uid);
        bool aborted = (notif->status == IWL_SCAN_OFFLOAD_ABORTED);

        if (WARN_ON(!(mvm->scan_uid_status[uid] & mvm->scan_status)))
                return;

        /* if the scan is already stopping, we don't need to notify mac80211 */
        if (mvm->scan_uid_status[uid] == IWL_MVM_SCAN_REGULAR) {
                struct cfg80211_scan_info info = {
                        .aborted = aborted,
                        .scan_start_tsf = mvm->scan_start,
                };

                memcpy(info.tsf_bssid, mvm->scan_vif->bssid, ETH_ALEN);
                ieee80211_scan_completed(mvm->hw, &info);
                mvm->scan_vif = NULL;
                cancel_delayed_work(&mvm->scan_timeout_dwork);
                iwl_mvm_resume_tcm(mvm);
        } else if (mvm->scan_uid_status[uid] == IWL_MVM_SCAN_SCHED) {
                ieee80211_sched_scan_stopped(mvm->hw);
                mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_DISABLED;
        }

        mvm->scan_status &= ~mvm->scan_uid_status[uid];
        IWL_DEBUG_SCAN(mvm,
                       "Scan completed, uid %u type %u, status %s, EBS status %s\n",
                       uid, mvm->scan_uid_status[uid],
                       notif->status == IWL_SCAN_OFFLOAD_COMPLETED ?
                                "completed" : "aborted",
                       iwl_mvm_ebs_status_str(notif->ebs_status));
        IWL_DEBUG_SCAN(mvm,
                       "Last line %d, Last iteration %d, Time from last iteration %d\n",
                       notif->last_schedule, notif->last_iter,
                       __le32_to_cpu(notif->time_from_last_iter));

        if (notif->ebs_status != IWL_SCAN_EBS_SUCCESS &&
            notif->ebs_status != IWL_SCAN_EBS_INACTIVE)
                mvm->last_ebs_successful = false;

        mvm->scan_uid_status[uid] = 0;
}

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

        mvm->scan_start = le64_to_cpu(notif->start_tsf);

        IWL_DEBUG_SCAN(mvm,
                       "UMAC Scan iteration complete: status=0x%x scanned_channels=%d\n",
                       notif->status, notif->scanned_channels);

        if (mvm->sched_scan_pass_all == SCHED_SCAN_PASS_ALL_FOUND) {
                IWL_DEBUG_SCAN(mvm, "Pass all scheduled scan results found\n");
                ieee80211_sched_scan_results(mvm->hw);
                mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_ENABLED;
        }

        IWL_DEBUG_SCAN(mvm,
                       "UMAC Scan iteration complete: scan started at %llu (TSF)\n",
                       mvm->scan_start);
}

static int iwl_mvm_umac_scan_abort(struct iwl_mvm *mvm, int type)
{
        struct iwl_umac_scan_abort cmd = {};
        int uid, ret;

        lockdep_assert_held(&mvm->mutex);

        /* We should always get a valid index here, because we already
         * checked that this type of scan was running in the generic
         * code.
         */
        uid = iwl_mvm_scan_uid_by_status(mvm, type);
        if (WARN_ON_ONCE(uid < 0))
                return uid;

        cmd.uid = cpu_to_le32(uid);

        IWL_DEBUG_SCAN(mvm, "Sending scan abort, uid %u\n", uid);

        ret = iwl_mvm_send_cmd_pdu(mvm,
                                   iwl_cmd_id(SCAN_ABORT_UMAC,
                                              IWL_ALWAYS_LONG_GROUP, 0),
                                   0, sizeof(cmd), &cmd);
        if (!ret)
                mvm->scan_uid_status[uid] = type << IWL_MVM_SCAN_STOPPING_SHIFT;

        return ret;
}

static int iwl_mvm_scan_stop_wait(struct iwl_mvm *mvm, int type)
{
        struct iwl_notification_wait wait_scan_done;
        static const u16 scan_done_notif[] = { SCAN_COMPLETE_UMAC,
                                              SCAN_OFFLOAD_COMPLETE, };
        int ret;

        lockdep_assert_held(&mvm->mutex);

        iwl_init_notification_wait(&mvm->notif_wait, &wait_scan_done,
                                   scan_done_notif,
                                   ARRAY_SIZE(scan_done_notif),
                                   NULL, NULL);

        IWL_DEBUG_SCAN(mvm, "Preparing to stop scan, type %x\n", type);

        if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_UMAC_SCAN))
                ret = iwl_mvm_umac_scan_abort(mvm, type);
        else
                ret = iwl_mvm_lmac_scan_abort(mvm);

        if (ret) {
                IWL_DEBUG_SCAN(mvm, "couldn't stop scan type %d\n", type);
                iwl_remove_notification(&mvm->notif_wait, &wait_scan_done);
                return ret;
        }

        return iwl_wait_notification(&mvm->notif_wait, &wait_scan_done,
                                     1 * HZ);
}

#define IWL_SCAN_REQ_UMAC_HANDLE_SIZE(_ver) {                           \
        case (_ver): return sizeof(struct iwl_scan_req_umac_v##_ver);   \
}

static int iwl_scan_req_umac_get_size(u8 scan_ver)
{
        switch (scan_ver) {
                IWL_SCAN_REQ_UMAC_HANDLE_SIZE(14);
                IWL_SCAN_REQ_UMAC_HANDLE_SIZE(12);
        }

        return 0;
}

int iwl_mvm_scan_size(struct iwl_mvm *mvm)
{
        int base_size, tail_size;
        u8 scan_ver = iwl_fw_lookup_cmd_ver(mvm->fw, IWL_ALWAYS_LONG_GROUP,
                                            SCAN_REQ_UMAC,
                                            IWL_FW_CMD_VER_UNKNOWN);

        base_size = iwl_scan_req_umac_get_size(scan_ver);
        if (base_size)
                return base_size;


        if (iwl_mvm_is_adaptive_dwell_v2_supported(mvm))
                base_size = IWL_SCAN_REQ_UMAC_SIZE_V8;
        else if (iwl_mvm_is_adaptive_dwell_supported(mvm))
                base_size = IWL_SCAN_REQ_UMAC_SIZE_V7;
        else if (iwl_mvm_cdb_scan_api(mvm))
                base_size = IWL_SCAN_REQ_UMAC_SIZE_V6;
        else
                base_size = IWL_SCAN_REQ_UMAC_SIZE_V1;

        if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_UMAC_SCAN)) {
                if (iwl_mvm_is_scan_ext_chan_supported(mvm))
                        tail_size = sizeof(struct iwl_scan_req_umac_tail_v2);
                else
                        tail_size = sizeof(struct iwl_scan_req_umac_tail_v1);

                return base_size +
                        sizeof(struct iwl_scan_channel_cfg_umac) *
                                mvm->fw->ucode_capa.n_scan_channels +
                        tail_size;
        }
        return sizeof(struct iwl_scan_req_lmac) +
                sizeof(struct iwl_scan_channel_cfg_lmac) *
                mvm->fw->ucode_capa.n_scan_channels +
                sizeof(struct iwl_scan_probe_req_v1);
}

/*
 * This function is used in nic restart flow, to inform mac80211 about scans
 * that was aborted by restart flow or by an assert.
 */
void iwl_mvm_report_scan_aborted(struct iwl_mvm *mvm)
{
        if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_UMAC_SCAN)) {
                int uid, i;

                uid = iwl_mvm_scan_uid_by_status(mvm, IWL_MVM_SCAN_REGULAR);
                if (uid >= 0) {
                        struct cfg80211_scan_info info = {
                                .aborted = true,
                        };

                        cancel_delayed_work(&mvm->scan_timeout_dwork);

                        ieee80211_scan_completed(mvm->hw, &info);
                        mvm->scan_uid_status[uid] = 0;
                }
                uid = iwl_mvm_scan_uid_by_status(mvm, IWL_MVM_SCAN_SCHED);
                if (uid >= 0) {
                        /* Sched scan will be restarted by mac80211 in
                         * restart_hw, so do not report if FW is about to be
                         * restarted.
                         */
                        if (!mvm->fw_restart)
                                ieee80211_sched_scan_stopped(mvm->hw);
                        mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_DISABLED;
                        mvm->scan_uid_status[uid] = 0;
                }
                uid = iwl_mvm_scan_uid_by_status(mvm,
                                                 IWL_MVM_SCAN_STOPPING_REGULAR);
                if (uid >= 0)
                        mvm->scan_uid_status[uid] = 0;

                uid = iwl_mvm_scan_uid_by_status(mvm,
                                                 IWL_MVM_SCAN_STOPPING_SCHED);
                if (uid >= 0)
                        mvm->scan_uid_status[uid] = 0;

                /* 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.
                 */
                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;
                }
        } else {
                if (mvm->scan_status & IWL_MVM_SCAN_REGULAR) {
                        struct cfg80211_scan_info info = {
                                .aborted = true,
                        };

                        cancel_delayed_work(&mvm->scan_timeout_dwork);
                        ieee80211_scan_completed(mvm->hw, &info);
                }

                /* Sched scan will be restarted by mac80211 in
                 * restart_hw, so do not report if FW is about to be
                 * restarted.
                 */
                if ((mvm->scan_status & IWL_MVM_SCAN_SCHED) &&
                    !mvm->fw_restart) {
                        ieee80211_sched_scan_stopped(mvm->hw);
                        mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_DISABLED;
                }
        }
}

int iwl_mvm_scan_stop(struct iwl_mvm *mvm, int type, bool notify)
{
        int ret;

        if (!(mvm->scan_status & type))
                return 0;

        if (iwl_mvm_is_radio_killed(mvm)) {
                ret = 0;
                goto out;
        }

        ret = iwl_mvm_scan_stop_wait(mvm, type);
        if (!ret)
                mvm->scan_status |= type << IWL_MVM_SCAN_STOPPING_SHIFT;
out:
        /* Clear the scan status so the next scan requests will
         * succeed and mark the scan as stopping, so that the Rx
         * handler doesn't do anything, as the scan was stopped from
         * above.
         */
        mvm->scan_status &= ~type;

        if (type == IWL_MVM_SCAN_REGULAR) {
                cancel_delayed_work(&mvm->scan_timeout_dwork);
                if (notify) {
                        struct cfg80211_scan_info info = {
                                .aborted = true,
                        };

                        ieee80211_scan_completed(mvm->hw, &info);
                }
        } else if (notify) {
                ieee80211_sched_scan_stopped(mvm->hw);
                mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_DISABLED;
        }

        return ret;
}