Quelle  scan.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
 * Copyright (C) 2012-2014, 2018-2025 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"
#include "iwl-utils.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

/* 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

/* minimal number of 2GHz and 5GHz channels in the regular scan request */
#define IWL_MVM_6GHZ_PASSIVE_SCAN_MIN_CHANS 4

/* Number of iterations on the channel for mei filtered scan */
#define IWL_MEI_SCAN_NUM_ITER 5U

#define WFA_TPC_IE_LEN 9

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;
 bool enable_6ghz_passive;
 bool respect_p2p_go, respect_p2p_go_hb;
 s8 tsf_report_link_id;
 u8 bssid[ETH_ALEN] __aligned(2);
};

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_V1 |
       tx_ant);
 else
  return cpu_to_le32(IWL_RATE_6M_PLCP | tx_ant);
}

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_mvm_scan_iter_data {
 u32 global_cnt;
 struct ieee80211_vif *current_vif;
 bool is_dcm_with_p2p_go;
};

static void iwl_mvm_scan_iterator(void *_data, u8 *mac,
      struct ieee80211_vif *vif)
{
 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 struct iwl_mvm_scan_iter_data *data = _data;
 struct iwl_mvm_vif *curr_mvmvif;

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

 if (!data->current_vif || vif == data->current_vif)
  return;

 curr_mvmvif = iwl_mvm_vif_from_mac80211(data->current_vif);

 if (ieee80211_vif_type_p2p(vif) == NL80211_IFTYPE_P2P_GO &&
     mvmvif->deflink.phy_ctxt && curr_mvmvif->deflink.phy_ctxt &&
     mvmvif->deflink.phy_ctxt->id != curr_mvmvif->deflink.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)
{
 struct iwl_mvm_scan_iter_data data = {
  .current_vif = vif,
  .is_dcm_with_p2p_go = false,
  .global_cnt = 0,
 };

 /*
 * A scanning AP interface probably wants to generate a survey to do
 * ACS (automatic channel selection).
 * Force a non-fragmented scan in that case.
 */
 if (vif && ieee80211_vif_type_p2p(vif) == NL80211_IFTYPE_AP)
  return IWL_SCAN_TYPE_WILD;

 ieee80211_iterate_active_interfaces_atomic(mvm->hw,
         IEEE80211_IFACE_ITER_NORMAL,
         iwl_mvm_scan_iterator,
         &data);

 if (!data.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 P2P GO set all scan requests as
 * fast-balance scan
 */
  if (vif && vif->type == NL80211_IFTYPE_STATION &&
      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 SSID element and WFA TPC element */
 max_probe_len -= 24 + 2 + WFA_TPC_IE_LEN;

 /* 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[i].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 = IWL_AUTH_ALGO_UNSUPPORTED |
   IWL_AUTH_ALGO_NONE | IWL_AUTH_ALGO_PSK | IWL_AUTH_ALGO_8021X |
   IWL_AUTH_ALGO_SAE | IWL_AUTH_ALGO_8021X_SHA384 | IWL_AUTH_ALGO_OWE;
  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_mvm_has_new_station_api(mvm->fw)) {
  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;
}

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);
 ether_addr_copy(frame->bssid, params->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] +
   ies->len[NL80211_BAND_6GHZ] <=
   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
 * 6. the VIF is not an AP interface (scan wants survey results)
 */
 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)) &&
  ieee80211_vif_type_p2p(vif) != NL80211_IFTYPE_AP);
}

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 =
   ¶ms->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, ¶ms->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_mvm_has_new_station_api(mvm->fw));

 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_mvm_has_new_station_api(mvm->fw));

 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 = WIDE_ID(IWL_ALWAYS_LONG_GROUP, SCAN_CFG_CMD),
 };
 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 = WIDE_ID(IWL_ALWAYS_LONG_GROUP, SCAN_CFG_CMD),
  .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_mvm_has_new_station_api(mvm->fw)) {
  cfg.bcast_sta_id = mvm->aux_sta.sta_id;
 } else if (iwl_fw_lookup_cmd_ver(mvm->fw, 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->n_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(int type)
{
 if (type == IWL_MVM_SCAN_REGULAR)
  return IWL_SCAN_PRIORITY_EXT_6;
 if (type == IWL_MVM_SCAN_INT_MLO)
  return IWL_SCAN_PRIORITY_EXT_4;

 return IWL_SCAN_PRIORITY_EXT_2;
}

static void
iwl_mvm_scan_umac_dwell_v11(struct iwl_mvm *mvm,
       struct iwl_scan_general_params_v11 *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->n_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].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->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->channel_num,
         cfg->v2.band, bitmap,
         bitmap_n_entries);
 }
}

static void
iwl_mvm_umac_scan_cfg_channels_v7(struct iwl_mvm *mvm,
      struct ieee80211_channel **channels,
      struct iwl_scan_channel_params_v7 *cp,
      int n_channels, u32 flags,
      enum nl80211_iftype vif_type, u32 version)
{
 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,
         channels[i]->hw_value);
  u8 iwl_band = iwl_mvm_phy_band_from_nl80211(band);

  cfg->flags = cpu_to_le32(flags | n_aps_flag);
  cfg->channel_num = channels[i]->hw_value;
  if (cfg80211_channel_is_psc(channels[i]))
   cfg->flags = 0;

  if (band == NL80211_BAND_6GHZ) {
   /* 6 GHz channels should only appear in a scan request
 * that has scan_6ghz set. The only exception is MLO
 * scan, which has to be passive.
 */
   WARN_ON_ONCE(cfg->flags != 0);
   cfg->flags =
    cpu_to_le32(IWL_UHB_CHAN_CFG_FLAG_FORCE_PASSIVE);
  }

  cfg->v2.iter_count = 1;
  cfg->v2.iter_interval = 0;
  if (version < 17)
   cfg->v2.band = iwl_band;
  else
   cfg->flags |= cpu_to_le32((iwl_band <<
         IWL_CHAN_CFG_FLAGS_BAND_POS));
 }
}

static void
iwl_mvm_umac_scan_fill_6g_chan_list(struct iwl_mvm *mvm,
        struct iwl_mvm_scan_params *params,
         struct iwl_scan_probe_params_v4 *pp)
{
 int j, idex_s = 0, idex_b = 0;
 struct cfg80211_scan_6ghz_params *scan_6ghz_params =
  params->scan_6ghz_params;
 bool hidden_supported = fw_has_capa(&mvm->fw->ucode_capa,
         IWL_UCODE_TLV_CAPA_HIDDEN_6GHZ_SCAN);

 for (j = 0; j < params->n_ssids && idex_s < SCAN_SHORT_SSID_MAX_SIZE;
      j++) {
  if (!params->ssids[j].ssid_len)
   continue;

  pp->short_ssid[idex_s] =
   cpu_to_le32(~crc32_le(~0, params->ssids[j].ssid,
           params->ssids[j].ssid_len));

  if (hidden_supported) {
   pp->direct_scan[idex_s].id = WLAN_EID_SSID;
   pp->direct_scan[idex_s].len = params->ssids[j].ssid_len;
   memcpy(pp->direct_scan[idex_s].ssid, params->ssids[j].ssid,
          params->ssids[j].ssid_len);
  }
  idex_s++;
 }

 /*
 * 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 (pp->short_ssid[k] ==
        cpu_to_le32(scan_6ghz_params[j].short_ssid))
     break;
   }

   if (k == idex_s && idex_s < SCAN_SHORT_SSID_MAX_SIZE) {
    pp->short_ssid[idex_s++] =
     cpu_to_le32(scan_6ghz_params[j].short_ssid);
   }
  }

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

  if (k == idex_b && idex_b < SCAN_BSSID_MAX_SIZE &&
      !WARN_ONCE(!is_valid_ether_addr(scan_6ghz_params[j].bssid),
          "scan: invalid BSSID at index %u, index_b=%u\n",
          j, idex_b)) {
   memcpy(&pp->bssid_array[idex_b++],
          scan_6ghz_params[j].bssid, ETH_ALEN);
  }
 }

 pp->short_ssid_num = idex_s;
 pp->bssid_num = idex_b;
}

/* TODO: this function can be merged with iwl_mvm_scan_umac_fill_ch_p_v7 */
static u32
iwl_mvm_umac_scan_cfg_channels_v7_6g(struct iwl_mvm *mvm,
         struct iwl_mvm_scan_params *params,
         u32 n_channels,
         struct iwl_scan_probe_params_v4 *pp,
         struct iwl_scan_channel_params_v7 *cp,
         enum nl80211_iftype vif_type,
         u32 version)
{
 int i;
 struct cfg80211_scan_6ghz_params *scan_6ghz_params =
  params->scan_6ghz_params;
 u32 ch_cnt;

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

  u32 s_ssid_bitmap = 0, bssid_bitmap = 0, flags = 0;
  u8 k, n_s_ssids = 0, n_bssids = 0;
  u8 max_s_ssids, max_bssids;
  bool force_passive = false, found = false, allow_passive = true,
       unsolicited_probe_on_chan = false, psc_no_listen = false;
  s8 psd_20 = IEEE80211_RNR_TBTT_PARAMS_PSD_RESERVED;

  /*
 * Avoid performing passive scan on non PSC channels unless the
 * scan is specifically a passive scan, i.e., no SSIDs
 * configured in the scan command.
 */
  if (!cfg80211_channel_is_psc(params->channels[i]) &&
      !params->n_6ghz_params && params->n_ssids)
   continue;

  cfg->channel_num = params->channels[i]->hw_value;
  if (version < 17)
   cfg->v2.band = PHY_BAND_6;
  else
   cfg->flags |= cpu_to_le32(PHY_BAND_6 <<
        IWL_CHAN_CFG_FLAGS_BAND_POS);

  cfg->v5.iter_count = 1;
  cfg->v5.iter_interval = 0;

  for (u32 j = 0; j < params->n_6ghz_params; j++) {
   s8 tmp_psd_20;

   if (!(scan_6ghz_params[j].channel_idx == i))
    continue;

   unsolicited_probe_on_chan |=
    scan_6ghz_params[j].unsolicited_probe;

   /* Use the highest PSD value allowed as advertised by
 * APs for this channel
 */
   tmp_psd_20 = scan_6ghz_params[j].psd_20;
   if (tmp_psd_20 !=
       IEEE80211_RNR_TBTT_PARAMS_PSD_RESERVED &&
       (psd_20 ==
        IEEE80211_RNR_TBTT_PARAMS_PSD_RESERVED ||
        psd_20 < tmp_psd_20))
    psd_20 = tmp_psd_20;

   psc_no_listen |= scan_6ghz_params[j].psc_no_listen;
  }

  /*
 * 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]) ||
       psc_no_listen) {
    if (unsolicited_probe_on_chan) {
     max_s_ssids = 2;
     max_bssids = 6;
    } else {
     max_s_ssids = 3;
     max_bssids = 9;
    }
   } else {
    max_s_ssids = 2;
    max_bssids = 6;
   }
  } else if (cfg80211_channel_is_psc(params->channels[i])) {
   max_s_ssids = 1;
   max_bssids = 3;
  } else {
   if (unsolicited_probe_on_chan) {
    max_s_ssids = 1;
    max_bssids = 3;
   } else {
    max_s_ssids = 2;
    max_bssids = 6;
   }
  }

  /*
 * 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
 */
  for (u32 j = 0; j < params->n_6ghz_params; j++) {
   if (!(scan_6ghz_params[j].channel_idx == i))
    continue;

   found = false;

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

     /*
 * Prefer creating BSSID entries unless
 * the short SSID probe can be done in
 * the same channel dwell iteration.
 *
 * We also need to create a short SSID
 * entry for any hidden AP.
 */
     if (3 * n_s_ssids > n_bssids &&
         !pp->direct_scan[k].len)
      break;

     /* Hidden AP, cannot do passive scan */
     if (pp->direct_scan[k].len)
      allow_passive = false;

     s_ssid_bitmap |= BIT(k);
     n_s_ssids++;
     found = true;
     break;
    }
   }

   if (found)
    continue;

   for (k = 0; k < pp->bssid_num; k++) {
    if (!memcmp(&pp->bssid_array[k],
         scan_6ghz_params[j].bssid,
         ETH_ALEN)) {
     if (!(bssid_bitmap & BIT(k))) {
      if (n_bssids < max_bssids) {
       bssid_bitmap |= BIT(k);
       n_bssids++;
      } else {
       force_passive = TRUE;
      }
     }
     break;
    }
   }
  }

  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;

  if ((allow_passive && force_passive) ||
      (!(bssid_bitmap | s_ssid_bitmap) &&
       !cfg80211_channel_is_psc(params->channels[i])))
   flags |= IWL_UHB_CHAN_CFG_FLAG_FORCE_PASSIVE;
  else
   flags |= bssid_bitmap | (s_ssid_bitmap << 16);

  cfg->flags |= cpu_to_le32(flags);
  if (version >= 17)
   cfg->v5.psd_20 = psd_20;

  ch_cnt++;
 }

 if (params->n_channels > ch_cnt)
  IWL_DEBUG_SCAN(mvm,
          "6GHz: reducing number channels: (%u->%u)\n",
          params->n_channels, ch_cnt);

 return ch_cnt;
}

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_cdb_supported(mvm) &&
      iwl_mvm_is_scan_fragmented(params->type)) ||
     (iwl_mvm_is_cdb_supported(mvm) &&
      iwl_mvm_is_scan_fragmented(params->hb_type)))
  flags |= IWL_SCAN_CHANNEL_FLAG_EBS_FRAG;

 /*
 * force EBS in case the scan is a fragmented and there is a need to take P2P
 * GO operation into consideration during scan operation.
 */
 if ((!iwl_mvm_is_cdb_supported(mvm) &&
      iwl_mvm_is_scan_fragmented(params->type) && params->respect_p2p_go) ||
     (iwl_mvm_is_cdb_supported(mvm) &&
      iwl_mvm_is_scan_fragmented(params->hb_type) &&
      params->respect_p2p_go_hb)) {
  IWL_DEBUG_SCAN(mvm, "Respect P2P GO. Force EBS\n");
  flags |= IWL_SCAN_CHANNEL_FLAG_FORCE_EBS;
 }

 return flags;
}

static void iwl_mvm_scan_6ghz_passive_scan(struct iwl_mvm *mvm,
        struct iwl_mvm_scan_params *params,
        struct ieee80211_vif *vif)
{
 struct ieee80211_supported_band *sband =
  &mvm->nvm_data->bands[NL80211_BAND_6GHZ];
 u32 n_disabled, i;

 params->enable_6ghz_passive = false;

 if (params->scan_6ghz)
  return;

 if (!fw_has_capa(&mvm->fw->ucode_capa,
    IWL_UCODE_TLV_CAPA_PASSIVE_6GHZ_SCAN)) {
  IWL_DEBUG_SCAN(mvm,
          "6GHz passive scan: Not supported by FW\n");
  return;
 }

 /* 6GHz passive scan allowed only on station interface  */
 if (vif->type != NL80211_IFTYPE_STATION) {
  IWL_DEBUG_SCAN(mvm,
          "6GHz passive scan: not station interface\n");
  return;
 }

 /*
 * 6GHz passive scan is allowed in a defined time interval following HW
 * reset or resume flow, or while not associated and a large interval
 * has passed since the last 6GHz passive scan.
 */
 if ((vif->cfg.assoc ||
      time_after(mvm->last_6ghz_passive_scan_jiffies +
   (IWL_MVM_6GHZ_PASSIVE_SCAN_TIMEOUT * HZ), jiffies)) &&
     (time_before(mvm->last_reset_or_resume_time_jiffies +
    (IWL_MVM_6GHZ_PASSIVE_SCAN_ASSOC_TIMEOUT * HZ),
    jiffies))) {
  IWL_DEBUG_SCAN(mvm, "6GHz passive scan: %s\n",
          vif->cfg.assoc ? "associated" :
          "timeout did not expire");
  return;
 }

 /* not enough channels in the regular scan request */
 if (params->n_channels < IWL_MVM_6GHZ_PASSIVE_SCAN_MIN_CHANS) {
  IWL_DEBUG_SCAN(mvm,
          "6GHz passive scan: not enough channels\n");
  return;
 }

 for (i = 0; i < params->n_ssids; i++) {
  if (!params->ssids[i].ssid_len)
   break;
 }

 /* not a wildcard scan, so cannot enable passive 6GHz scan */
 if (i == params->n_ssids) {
  IWL_DEBUG_SCAN(mvm,
          "6GHz passive scan: no wildcard SSID\n");
  return;
 }

 if (!sband || !sband->n_channels) {
  IWL_DEBUG_SCAN(mvm,
          "6GHz passive scan: no 6GHz channels\n");
  return;
 }

 for (i = 0, n_disabled = 0; i < sband->n_channels; i++) {
  if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED))
   n_disabled++;
 }

 /*
 * Not all the 6GHz channels are disabled, so no need for 6GHz passive
 * scan
 */
 if (n_disabled != sband->n_channels) {
  IWL_DEBUG_SCAN(mvm,
          "6GHz passive scan: 6GHz channels enabled\n");
  return;
 }

 /* all conditions to enable 6ghz passive scan are satisfied */
 IWL_DEBUG_SCAN(mvm, "6GHz passive scan: can be enabled\n");
 params->enable_6ghz_passive = true;
}

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 no direct SSIDs are provided perform a passive scan. Otherwise,
 * if there is a single SSID which is not the broadcast SSID, assume
 * that the scan is intended for roaming purposes and thus enable Rx on
 * all chains to improve chances of hearing the beacons/probe responses.
 */
 if (params->n_ssids == 0)
  flags |= IWL_UMAC_SCAN_GEN_FLAGS_V2_FORCE_PASSIVE;
 else if (params->n_ssids == 1 && params->ssids[0].ssid_len)
  flags |= IWL_UMAC_SCAN_GEN_FLAGS_V2_USE_ALL_RX_CHAINS;

 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;

 if (params->enable_6ghz_passive)
  flags |= IWL_UMAC_SCAN_GEN_FLAGS_V2_6GHZ_PASSIVE_SCAN;

 if (iwl_mvm_is_oce_supported(mvm) &&
     (params->flags & (NL80211_SCAN_FLAG_ACCEPT_BCAST_PROBE_RESP |
         NL80211_SCAN_FLAG_OCE_PROBE_REQ_HIGH_TX_RATE |
         NL80211_SCAN_FLAG_FILS_MAX_CHANNEL_TIME)))
  flags |= IWL_UMAC_SCAN_GEN_FLAGS_V2_OCE;

 return flags;
}

static u8 iwl_mvm_scan_umac_flags2(struct iwl_mvm *mvm,
       struct iwl_mvm_scan_params *params,
       struct ieee80211_vif *vif, int type,
       u16 gen_flags)
{
 u8 flags = 0;

 if (iwl_mvm_is_cdb_supported(mvm)) {
  if (params->respect_p2p_go)
   flags |= IWL_UMAC_SCAN_GEN_PARAMS_FLAGS2_RESPECT_P2P_GO_LB;
  if (params->respect_p2p_go_hb)
   flags |= IWL_UMAC_SCAN_GEN_PARAMS_FLAGS2_RESPECT_P2P_GO_HB;
 } else {
  if (params->respect_p2p_go)
   flags = IWL_UMAC_SCAN_GEN_PARAMS_FLAGS2_RESPECT_P2P_GO_LB |
    IWL_UMAC_SCAN_GEN_PARAMS_FLAGS2_RESPECT_P2P_GO_HB;
 }

 if (params->scan_6ghz &&
     fw_has_capa(&mvm->fw->ucode_capa,
   IWL_UCODE_TLV_CAPA_SCAN_DONT_TOGGLE_ANT))
  flags |= IWL_UMAC_SCAN_GEN_PARAMS_FLAGS2_DONT_TOGGLE_ANT;

 /* Passive and AP interface -> ACS (automatic channel selection) */
 if (gen_flags & IWL_UMAC_SCAN_GEN_FLAGS_V2_FORCE_PASSIVE &&
     ieee80211_vif_type_p2p(vif) == NL80211_IFTYPE_AP &&
     iwl_fw_lookup_notif_ver(mvm->fw, SCAN_GROUP, CHANNEL_SURVEY_NOTIF,
        0) >= 1)
  flags |= IWL_UMAC_SCAN_GEN_FLAGS2_COLLECT_CHANNEL_STATS;

 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;

--> --------------------

--> maximum size reached

--> --------------------