Quelle  scan.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
 * Copyright (C) 2024-2025 Intel Corporation
 */
#include <linux/crc32.h>

#include "iwl-utils.h"

#include "mld.h"
#include "scan.h"
#include "hcmd.h"
#include "iface.h"
#include "phy.h"
#include "mlo.h"

#include "fw/api/scan.h"
#include "fw/dbg.h"

#define IWL_SCAN_DWELL_ACTIVE 10
#define IWL_SCAN_DWELL_PASSIVE 110
#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 for P2P social channels (1, 6, 11) */
#define IWL_SCAN_ADWELL_DEFAULT_N_APS_SOCIAL 10

/* 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 P2P social channels */
#define IWL_SCAN_ADWELL_N_APS_SOCIAL_CHS 2

/* 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)

#define SCAN_TIMEOUT_MSEC (30000 * HZ)

/* minimal number of 2GHz and 5GHz channels in the regular scan request */
#define IWL_MLD_6GHZ_PASSIVE_SCAN_MIN_CHANS 4

enum iwl_mld_scan_type {
 IWL_SCAN_TYPE_NOT_SET,
 IWL_SCAN_TYPE_UNASSOC,
 IWL_SCAN_TYPE_WILD,
 IWL_SCAN_TYPE_MILD,
 IWL_SCAN_TYPE_FRAGMENTED,
 IWL_SCAN_TYPE_FAST_BALANCE,
};

struct iwl_mld_scan_timing_params {
 u32 suspend_time;
 u32 max_out_time;
};

static const struct iwl_mld_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_mld_scan_params {
 enum iwl_mld_scan_type 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;
 bool respect_p2p_go;
 u8 fw_link_id;
 struct cfg80211_scan_6ghz_params *scan_6ghz_params;
 u32 n_6ghz_params;
 bool scan_6ghz;
 bool enable_6ghz_passive;
 u8 bssid[ETH_ALEN] __aligned(2);
};

struct iwl_mld_scan_respect_p2p_go_iter_data {
 struct ieee80211_vif *current_vif;
 bool p2p_go;
};

static void iwl_mld_scan_respect_p2p_go_iter(void *_data, u8 *mac,
          struct ieee80211_vif *vif)
{
 struct iwl_mld_scan_respect_p2p_go_iter_data *data = _data;

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

 /* TODO: CDB check the band of the GO */
 if (ieee80211_vif_type_p2p(vif) == NL80211_IFTYPE_P2P_GO &&
     iwl_mld_vif_from_mac80211(vif)->ap_ibss_active)
  data->p2p_go = true;
}

static bool iwl_mld_get_respect_p2p_go(struct iwl_mld *mld,
           struct ieee80211_vif *vif,
           bool low_latency)
{
 struct iwl_mld_scan_respect_p2p_go_iter_data data = {
  .current_vif = vif,
  .p2p_go = false,
 };

 if (!low_latency)
  return false;

 ieee80211_iterate_active_interfaces_mtx(mld->hw,
      IEEE80211_IFACE_ITER_NORMAL,
      iwl_mld_scan_respect_p2p_go_iter,
      &data);

 return data.p2p_go;
}

struct iwl_mld_scan_iter_data {
 struct ieee80211_vif *current_vif;
 bool active_vif;
 bool is_dcm_with_p2p_go;
 bool global_low_latency;
};

static void iwl_mld_scan_iterator(void *_data, u8 *mac,
      struct ieee80211_vif *vif)
{
 struct iwl_mld_scan_iter_data *data = _data;
 struct ieee80211_vif *curr_vif = data->current_vif;
 struct iwl_mld_vif *mld_vif = iwl_mld_vif_from_mac80211(vif);
 struct iwl_mld_vif *curr_mld_vif;
 unsigned long curr_vif_active_links;
 u16 link_id;

 data->global_low_latency |= iwl_mld_vif_low_latency(mld_vif);

 if ((ieee80211_vif_is_mld(vif) && vif->active_links) ||
     (vif->type != NL80211_IFTYPE_P2P_DEVICE &&
      mld_vif->deflink.active))
  data->active_vif = true;

 if (vif == curr_vif)
  return;

 if (ieee80211_vif_type_p2p(vif) != NL80211_IFTYPE_P2P_GO)
  return;

 /* Currently P2P GO can't be AP MLD so the logic below assumes that */
 WARN_ON_ONCE(ieee80211_vif_is_mld(vif));

 curr_vif_active_links =
  ieee80211_vif_is_mld(curr_vif) ? curr_vif->active_links : 1;

 curr_mld_vif = iwl_mld_vif_from_mac80211(curr_vif);

 for_each_set_bit(link_id, &curr_vif_active_links,
    IEEE80211_MLD_MAX_NUM_LINKS) {
  struct iwl_mld_link *curr_mld_link =
   iwl_mld_link_dereference_check(curr_mld_vif, link_id);

  if (WARN_ON(!curr_mld_link))
   return;

  if (rcu_access_pointer(curr_mld_link->chan_ctx) &&
      rcu_access_pointer(mld_vif->deflink.chan_ctx) !=
      rcu_access_pointer(curr_mld_link->chan_ctx)) {
   data->is_dcm_with_p2p_go = true;
   return;
  }
 }
}

static enum
iwl_mld_scan_type iwl_mld_get_scan_type(struct iwl_mld *mld,
     struct ieee80211_vif *vif,
     struct iwl_mld_scan_iter_data *data)
{
 enum iwl_mld_traffic_load load = mld->scan.traffic_load.status;

 /* 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 (ieee80211_vif_type_p2p(vif) == NL80211_IFTYPE_AP)
  return IWL_SCAN_TYPE_WILD;

 if (!data->active_vif)
  return IWL_SCAN_TYPE_UNASSOC;

 if ((load == IWL_MLD_TRAFFIC_HIGH || data->global_low_latency) &&
     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->type == NL80211_IFTYPE_STATION &&
     data->is_dcm_with_p2p_go)
  return IWL_SCAN_TYPE_FAST_BALANCE;

 if (load >= IWL_MLD_TRAFFIC_MEDIUM || data->global_low_latency)
  return IWL_SCAN_TYPE_MILD;

 return IWL_SCAN_TYPE_WILD;
}

static u8 *
iwl_mld_scan_add_2ghz_elems(struct iwl_mld *mld, 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;

 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_mld_scan_add_tpc_report_elem(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 u32
iwl_mld_scan_ooc_priority(enum iwl_mld_scan_status scan_status)
{
 if (scan_status == IWL_MLD_SCAN_REGULAR)
  return IWL_SCAN_PRIORITY_EXT_6;
 if (scan_status == IWL_MLD_SCAN_INT_MLO)
  return IWL_SCAN_PRIORITY_EXT_4;

 return IWL_SCAN_PRIORITY_EXT_2;
}

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

static bool
iwl_mld_scan_is_fragmented(enum iwl_mld_scan_type type)
{
 return (type == IWL_SCAN_TYPE_FRAGMENTED ||
  type == IWL_SCAN_TYPE_FAST_BALANCE);
}

static int
iwl_mld_scan_uid_by_status(struct iwl_mld *mld, int status)
{
 for (int i = 0; i < ARRAY_SIZE(mld->scan.uid_status); i++)
  if (mld->scan.uid_status[i] == status)
   return i;

 return -ENOENT;
}

static const char *
iwl_mld_scan_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";
 }
}

static int
iwl_mld_scan_ssid_exist(u8 *ssid, u8 ssid_len, struct iwl_ssid_ie *ssid_list)
{
 for (int i = 0; i < PROBE_OPTION_MAX; i++) {
  if (!ssid_list[i].len)
   return -1;
  if (ssid_list[i].len == ssid_len &&
      !memcmp(ssid_list[i].ssid, ssid, ssid_len))
   return i;
 }

 return -1;
}

static bool
iwl_mld_scan_fits(struct iwl_mld *mld, int n_ssids,
    struct ieee80211_scan_ies *ies, int n_channels)
{
 return ((n_ssids <= PROBE_OPTION_MAX) &&
  (n_channels <= mld->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_mld_scan_max_template_size()));
}

static void
iwl_mld_scan_build_probe_req(struct iwl_mld *mld, struct ieee80211_vif *vif,
        struct ieee80211_scan_ies *ies,
        struct iwl_mld_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;

 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_mld_scan_add_2ghz_elems(mld,
          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);

 iwl_mld_scan_add_tpc_report_elem(pos + ies->common_ie_len);
 params->preq.common_data.len = cpu_to_le16(ies->common_ie_len +
         WFA_TPC_IE_LEN);
}

static u16
iwl_mld_scan_get_cmd_gen_flags(struct iwl_mld *mld,
          struct iwl_mld_scan_params *params,
          struct ieee80211_vif *vif,
          enum iwl_mld_scan_status scan_status)
{
 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 (params->pass_all)
  flags |= IWL_UMAC_SCAN_GEN_FLAGS_V2_PASS_ALL;
 else
  flags |= IWL_UMAC_SCAN_GEN_FLAGS_V2_MATCH;

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

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

 if (params->iter_notif ||
     mld->scan.pass_all_sched_res == SCHED_SCAN_PASS_ALL_STATE_ENABLED)
  flags |= IWL_UMAC_SCAN_GEN_FLAGS_V2_NTFY_ITER_COMPLETE;

 if (scan_status == IWL_MLD_SCAN_SCHED ||
     scan_status == IWL_MLD_SCAN_NETDETECT)
  flags |= IWL_UMAC_SCAN_GEN_FLAGS_V2_PREEMPTIVE;

 if (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;

 if ((scan_status == IWL_MLD_SCAN_SCHED ||
      scan_status == IWL_MLD_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;

 flags |= IWL_UMAC_SCAN_GEN_FLAGS_V2_ADAPTIVE_DWELL;

 return flags;
}

static u8
iwl_mld_scan_get_cmd_gen_flags2(struct iwl_mld *mld,
    struct iwl_mld_scan_params *params,
    struct ieee80211_vif *vif,
    enum iwl_mld_scan_status scan_status,
    u16 gen_flags)
{
 u8 flags = 0;

 /* TODO: CDB */
 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)
  flags |= IWL_UMAC_SCAN_GEN_PARAMS_FLAGS2_DONT_TOGGLE_ANT;

 /* For AP interfaces, request survey data for regular scans and if
 * it is supported. For non-AP interfaces, EBS will be enabled and
 * the results may be missing information for some channels.
 */
 if (scan_status == IWL_MLD_SCAN_REGULAR &&
     ieee80211_vif_type_p2p(vif) == NL80211_IFTYPE_AP &&
     gen_flags & IWL_UMAC_SCAN_GEN_FLAGS_V2_FORCE_PASSIVE &&
     iwl_fw_lookup_notif_ver(mld->fw, SCAN_GROUP,
        CHANNEL_SURVEY_NOTIF, 0) >= 1)
  flags |= IWL_UMAC_SCAN_GEN_FLAGS2_COLLECT_CHANNEL_STATS;

 return flags;
}

static void
iwl_mld_scan_cmd_set_dwell(struct iwl_mld *mld,
      struct iwl_scan_general_params_v11 *gp,
      struct iwl_mld_scan_params *params)
{
 const struct iwl_mld_scan_timing_params *timing =
  &scan_timing[params->type];

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

 if (params->n_ssids && params->ssids[0].ssid_len)
  gp->adwell_max_budget =
   cpu_to_le16(IWL_SCAN_ADWELL_MAX_BUDGET_DIRECTED_SCAN);
 else
  gp->adwell_max_budget =
   cpu_to_le16(IWL_SCAN_ADWELL_MAX_BUDGET_FULL_SCAN);

 gp->scan_priority = cpu_to_le32(IWL_SCAN_PRIORITY_EXT_6);

 gp->max_out_of_time[SCAN_LB_LMAC_IDX] = cpu_to_le32(timing->max_out_time);
 gp->suspend_time[SCAN_LB_LMAC_IDX] = cpu_to_le32(timing->suspend_time);

 gp->active_dwell[SCAN_LB_LMAC_IDX] = IWL_SCAN_DWELL_ACTIVE;
 gp->passive_dwell[SCAN_LB_LMAC_IDX] = IWL_SCAN_DWELL_PASSIVE;
 gp->active_dwell[SCAN_HB_LMAC_IDX] = IWL_SCAN_DWELL_ACTIVE;
 gp->passive_dwell[SCAN_HB_LMAC_IDX] = IWL_SCAN_DWELL_PASSIVE;

 IWL_DEBUG_SCAN(mld,
         "Scan: adwell_max_budget=%d max_out_of_time=%d suspend_time=%d\n",
         gp->adwell_max_budget,
         gp->max_out_of_time[SCAN_LB_LMAC_IDX],
         gp->suspend_time[SCAN_LB_LMAC_IDX]);
}

static void
iwl_mld_scan_cmd_set_gen_params(struct iwl_mld *mld,
    struct iwl_mld_scan_params *params,
    struct ieee80211_vif *vif,
    struct iwl_scan_general_params_v11 *gp,
    enum iwl_mld_scan_status scan_status)
{
 u16 gen_flags = iwl_mld_scan_get_cmd_gen_flags(mld, params, vif,
             scan_status);
 u8 gen_flags2 = iwl_mld_scan_get_cmd_gen_flags2(mld, params, vif,
       scan_status,
       gen_flags);

 IWL_DEBUG_SCAN(mld, "General: flags=0x%x, flags2=0x%x\n",
         gen_flags, gen_flags2);

 gp->flags = cpu_to_le16(gen_flags);
 gp->flags2 = gen_flags2;

 iwl_mld_scan_cmd_set_dwell(mld, gp, params);

 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 (params->fw_link_id != IWL_MLD_INVALID_FW_ID)
  gp->scan_start_mac_or_link_id = params->fw_link_id;
}

static int
iwl_mld_scan_cmd_set_sched_params(struct iwl_mld_scan_params *params,
      struct iwl_scan_umac_schedule *schedule,
      __le16 *delay)
{
 if (WARN_ON(!params->n_scan_plans ||
      params->n_scan_plans > IWL_MAX_SCHED_SCAN_PLANS))
  return -EINVAL;

 for (int i = 0; i < params->n_scan_plans; i++) {
  struct cfg80211_sched_scan_plan *scan_plan =
      ¶ms->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;
}

/* We insert the SSIDs in an inverted order, because the FW will
 * invert it back.
 */
static void
iwl_mld_scan_cmd_build_ssids(struct iwl_mld_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 match_sets */
  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_mld_scan_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 void
iwl_mld_scan_fill_6g_chan_list(struct iwl_mld_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;

 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));

  /* hidden 6ghz scan */
  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.
 */
 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;
}

static void
iwl_mld_scan_cmd_set_probe_params(struct iwl_mld_scan_params *params,
      struct iwl_scan_probe_params_v4 *pp,
      u32 *bitmap_ssid)
{
 pp->preq = params->preq;

 if (params->scan_6ghz) {
  iwl_mld_scan_fill_6g_chan_list(params, pp);
  return;
 }

 /* relevant only for 2.4 GHz /5 GHz scan */
 iwl_mld_scan_cmd_build_ssids(params, pp->direct_scan, bitmap_ssid);
}

static bool
iwl_mld_scan_use_ebs(struct iwl_mld *mld, struct ieee80211_vif *vif,
       bool low_latency)
{
 const struct iwl_ucode_capabilities *capa = &mld->fw->ucode_capa;

 /* We can only use EBS if:
 * 1. the feature is supported.
 * 2. the last EBS was successful.
 * 3. it's not a p2p find operation.
 * 4. we are not in low latency mode,
 *    or if fragmented ebs is supported by the FW
 * 5. the VIF is not an AP interface (scan wants survey results)
 */
 return ((capa->flags & IWL_UCODE_TLV_FLAGS_EBS_SUPPORT) &&
  !mld->scan.last_ebs_failed &&
  vif->type != NL80211_IFTYPE_P2P_DEVICE &&
  (!low_latency || fw_has_api(capa, IWL_UCODE_TLV_API_FRAG_EBS)) &&
  ieee80211_vif_type_p2p(vif) != NL80211_IFTYPE_AP);
}

static u8
iwl_mld_scan_cmd_set_chan_flags(struct iwl_mld *mld,
    struct iwl_mld_scan_params *params,
    struct ieee80211_vif *vif,
    bool low_latency)
{
 u8 flags = 0;

 flags |= IWL_SCAN_CHANNEL_FLAG_ENABLE_CHAN_ORDER;

 if (iwl_mld_scan_use_ebs(mld, vif, low_latency))
  flags |= IWL_SCAN_CHANNEL_FLAG_EBS |
    IWL_SCAN_CHANNEL_FLAG_EBS_ACCURATE |
    IWL_SCAN_CHANNEL_FLAG_CACHE_ADD;

 /* set fragmented ebs for fragmented scan */
 if (iwl_mld_scan_is_fragmented(params->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.
 */
 /* TODO: CDB */
 if (iwl_mld_scan_is_fragmented(params->type) &&
     params->respect_p2p_go) {
  IWL_DEBUG_SCAN(mld, "Respect P2P GO. Force EBS\n");
  flags |= IWL_SCAN_CHANNEL_FLAG_FORCE_EBS;
 }

 return flags;
}

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 u32 iwl_mld_scan_ch_n_aps_flag(enum nl80211_iftype vif_type, u8 ch_id)
{
 if (vif_type != NL80211_IFTYPE_P2P_DEVICE)
  return 0;

 for (int i = 0; i < ARRAY_SIZE(p2p_go_friendly_chs); i++) {
  if (ch_id == p2p_go_friendly_chs[i])
   return IWL_SCAN_ADWELL_N_APS_GO_FRIENDLY_BIT;
 }

 for (int i = 0; i < ARRAY_SIZE(social_chs); i++) {
  if (ch_id == social_chs[i])
   return IWL_SCAN_ADWELL_N_APS_SOCIAL_CHS_BIT;
 }

 return 0;
}

static void
iwl_mld_scan_cmd_set_channels(struct iwl_mld *mld,
         struct ieee80211_channel **channels,
         struct iwl_scan_channel_params_v7 *cp,
         int n_channels, u32 flags,
         enum nl80211_iftype vif_type)
{
 for (int i = 0; i < n_channels; i++) {
  enum nl80211_band band = channels[i]->band;
  struct iwl_scan_channel_cfg_umac *cfg = &cp->channel_config[i];
  u8 iwl_band = iwl_mld_nl80211_band_to_fw(band);
  u32 n_aps_flag =
   iwl_mld_scan_ch_n_aps_flag(vif_type,
         channels[i]->hw_value);

  if (IWL_MLD_ADAPTIVE_DWELL_NUM_APS_OVERRIDE)
   n_aps_flag = IWL_SCAN_ADWELL_N_APS_GO_FRIENDLY_BIT;

  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;
  cfg->flags |= cpu_to_le32(iwl_band <<
       IWL_CHAN_CFG_FLAGS_BAND_POS);
 }
}

static u8
iwl_mld_scan_cfg_channels_6g(struct iwl_mld *mld,
        struct iwl_mld_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)
{
 struct cfg80211_scan_6ghz_params *scan_6ghz_params =
  params->scan_6ghz_params;
 u32 i;
 u8 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;
  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.
 * 2. 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_mld_scan_is_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;
   }
  }

  /* To 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.
 */
  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))
     continue;

    if (bssid_bitmap & BIT(k))
     break;

    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);
  cfg->v5.psd_20 = psd_20;

  ch_cnt++;
 }

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

 return ch_cnt;
}

static int
iwl_mld_scan_cmd_set_6ghz_chan_params(struct iwl_mld *mld,
          struct iwl_mld_scan_params *params,
          struct ieee80211_vif *vif,
          struct iwl_scan_req_params_v17 *scan_p,
          enum iwl_mld_scan_status scan_status)
{
 struct iwl_scan_channel_params_v7 *chan_p = &scan_p->channel_params;
 struct iwl_scan_probe_params_v4 *probe_p = &scan_p->probe_params;

 chan_p->flags = iwl_mld_scan_get_cmd_gen_flags(mld, params, vif,
             scan_status);
 chan_p->count = iwl_mld_scan_cfg_channels_6g(mld, params,
           params->n_channels,
           probe_p, chan_p,
           vif->type);
 if (!chan_p->count)
  return -EINVAL;

 if (!params->n_ssids ||
     (params->n_ssids == 1 && !params->ssids[0].ssid_len))
  chan_p->flags |= IWL_SCAN_CHANNEL_FLAG_6G_PSC_NO_FILTER;

 return 0;
}

static int
iwl_mld_scan_cmd_set_chan_params(struct iwl_mld *mld,
     struct iwl_mld_scan_params *params,
     struct ieee80211_vif *vif,
     struct iwl_scan_req_params_v17 *scan_p,
     bool low_latency,
     enum iwl_mld_scan_status scan_status,
     u32 channel_cfg_flags)
{
 struct iwl_scan_channel_params_v7 *cp = &scan_p->channel_params;
 struct ieee80211_supported_band *sband =
  &mld->nvm_data->bands[NL80211_BAND_6GHZ];

 cp->n_aps_override[0] = IWL_SCAN_ADWELL_N_APS_GO_FRIENDLY;
 cp->n_aps_override[1] = IWL_SCAN_ADWELL_N_APS_SOCIAL_CHS;

 if (IWL_MLD_ADAPTIVE_DWELL_NUM_APS_OVERRIDE)
  cp->n_aps_override[0] = IWL_MLD_ADAPTIVE_DWELL_NUM_APS_OVERRIDE;

 if (params->scan_6ghz)
  return iwl_mld_scan_cmd_set_6ghz_chan_params(mld, params,
            vif, scan_p,
            scan_status);

 /* relevant only for 2.4 GHz/5 GHz scan */
 cp->flags = iwl_mld_scan_cmd_set_chan_flags(mld, params, vif,
          low_latency);
 cp->count = params->n_channels;

 iwl_mld_scan_cmd_set_channels(mld, params->channels, cp,
          params->n_channels, channel_cfg_flags,
          vif->type);

 if (!params->enable_6ghz_passive)
  return 0;

 /* fill 6 GHz passive scan cfg */
 for (int i = 0; i < sband->n_channels; i++) {
  struct ieee80211_channel *channel =
   &sband->channels[i];
  struct iwl_scan_channel_cfg_umac *cfg =
   &cp->channel_config[cp->count];

  if (!cfg80211_channel_is_psc(channel))
   continue;

  cfg->channel_num = channel->hw_value;
  cfg->v5.iter_count = 1;
  cfg->v5.iter_interval = 0;
  cfg->v5.psd_20 =
   IEEE80211_RNR_TBTT_PARAMS_PSD_RESERVED;
  cfg->flags = cpu_to_le32(PHY_BAND_6 <<
      IWL_CHAN_CFG_FLAGS_BAND_POS);
  cp->count++;
 }

 return 0;
}

static int
iwl_mld_scan_build_cmd(struct iwl_mld *mld, struct ieee80211_vif *vif,
         struct iwl_mld_scan_params *params,
         enum iwl_mld_scan_status scan_status,
         bool low_latency)
{
 struct iwl_scan_req_umac_v17 *cmd = mld->scan.cmd;
 struct iwl_scan_req_params_v17 *scan_p = &cmd->scan_params;
 u32 bitmap_ssid = 0;
 int uid, ret;

 memset(mld->scan.cmd, 0, mld->scan.cmd_size);

 /* find a free UID entry */
 uid = iwl_mld_scan_uid_by_status(mld, IWL_MLD_SCAN_NONE);
 if (uid < 0)
  return uid;

 cmd->uid = cpu_to_le32(uid);
 cmd->ooc_priority =
  cpu_to_le32(iwl_mld_scan_ooc_priority(scan_status));

 iwl_mld_scan_cmd_set_gen_params(mld, params, vif,
     &scan_p->general_params, scan_status);

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

 iwl_mld_scan_cmd_set_probe_params(params, &scan_p->probe_params,
       &bitmap_ssid);

 ret = iwl_mld_scan_cmd_set_chan_params(mld, params, vif, scan_p,
            low_latency, scan_status,
            bitmap_ssid);
 if (ret)
  return ret;

 return uid;
}

static bool
iwl_mld_scan_pass_all(struct iwl_mld *mld,
        struct cfg80211_sched_scan_request *req)
{
 if (req->n_match_sets && req->match_sets[0].ssid.ssid_len) {
  IWL_DEBUG_SCAN(mld,
          "Sending scheduled scan with filtering, n_match_sets %d\n",
          req->n_match_sets);
  mld->scan.pass_all_sched_res = SCHED_SCAN_PASS_ALL_STATE_DISABLED;
  return false;
 }

 IWL_DEBUG_SCAN(mld, "Sending Scheduled scan without filtering\n");
 mld->scan.pass_all_sched_res = SCHED_SCAN_PASS_ALL_STATE_ENABLED;

 return true;
}

static int
iwl_mld_config_sched_scan_profiles(struct iwl_mld *mld,
       struct cfg80211_sched_scan_request *req)
{
 struct iwl_host_cmd hcmd = {
  .id = SCAN_OFFLOAD_UPDATE_PROFILES_CMD,
  .dataflags[0] = IWL_HCMD_DFL_NOCOPY,
 };
 struct iwl_scan_offload_profile *profile;
 struct iwl_scan_offload_profile_cfg_data *cfg_data;
 struct iwl_scan_offload_profile_cfg *profile_cfg;
 struct iwl_scan_offload_blocklist *blocklist;
 u32 blocklist_size = IWL_SCAN_MAX_BLACKLIST_LEN * sizeof(*blocklist);
 u32 cmd_size = blocklist_size + sizeof(*profile_cfg);
 u8 *cmd;
 int ret;

 if (WARN_ON(req->n_match_sets > IWL_SCAN_MAX_PROFILES_V2))
  return -EIO;

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

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

 blocklist = (struct iwl_scan_offload_blocklist *)cmd;
 profile_cfg = (struct iwl_scan_offload_profile_cfg *)(cmd + blocklist_size);

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

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

 for (int i = 0; i < req->n_match_sets; i++) {
  profile = &profile_cfg->profiles[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;
  profile->ssid_index = i;
 }

 IWL_DEBUG_SCAN(mld,
         "Sending scheduled scan profile config (n_match_sets=%u)\n",
         req->n_match_sets);

 ret = iwl_mld_send_cmd(mld, &hcmd);

 kfree(cmd);

 return ret;
}

static int
iwl_mld_sched_scan_handle_non_psc_channels(struct iwl_mld_scan_params *params,
        bool *non_psc_included)
{
 int i, j;

 *non_psc_included = false;
 /* 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)
  return 0;

 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;

 return 0;
}

static void
iwl_mld_scan_6ghz_passive_scan(struct iwl_mld *mld,
          struct iwl_mld_scan_params *params,
          struct ieee80211_vif *vif)
{
 struct ieee80211_supported_band *sband =
  &mld->nvm_data->bands[NL80211_BAND_6GHZ];
 u32 n_disabled, i;

 params->enable_6ghz_passive = false;

 /* 6 GHz passive scan may be enabled in the first 2.4 GHz/5 GHz scan
 * phase to discover geo location if no AP's are found. Skip it when
 * we're in the 6 GHz scan phase.
 */
 if (params->scan_6ghz)
  return;

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

 /* 6 GHz 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 6 GHz passive scan.
 */
 if ((vif->cfg.assoc ||
      time_after(mld->scan.last_6ghz_passive_jiffies +
   (IWL_MLD_6GHZ_PASSIVE_SCAN_TIMEOUT * HZ), jiffies)) &&
     (time_before(mld->scan.last_start_time_jiffies +
    (IWL_MLD_6GHZ_PASSIVE_SCAN_ASSOC_TIMEOUT * HZ),
    jiffies))) {
  IWL_DEBUG_SCAN(mld, "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_MLD_6GHZ_PASSIVE_SCAN_MIN_CHANS) {
  IWL_DEBUG_SCAN(mld,
          "6GHz passive scan: not enough channels %d\n",
          params->n_channels);
  return;
 }

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

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

 if (!sband || !sband->n_channels) {
  IWL_DEBUG_SCAN(mld,
          "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 6 GHz channels are disabled, so no need for 6 GHz
 * passive scan
 */
 if (n_disabled != sband->n_channels) {
  IWL_DEBUG_SCAN(mld,
          "6GHz passive scan: 6GHz channels enabled\n");
  return;
 }

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

static void
iwl_mld_scan_set_link_id(struct iwl_mld *mld, struct ieee80211_vif *vif,
    struct iwl_mld_scan_params *params,
    s8 tsf_report_link_id,
    enum iwl_mld_scan_status scan_status)
{
 struct iwl_mld_vif *mld_vif = iwl_mld_vif_from_mac80211(vif);
 struct iwl_mld_link *link;

 if (tsf_report_link_id < 0) {
  if (vif->active_links)
   tsf_report_link_id = __ffs(vif->active_links);
  else
   tsf_report_link_id = 0;
 }

 link = iwl_mld_link_dereference_check(mld_vif, tsf_report_link_id);
 if (!WARN_ON(!link)) {
  params->fw_link_id = link->fw_id;
  /* we to store fw_link_id only for regular scan,
 * and use it in scan complete notif
 */
  if (scan_status == IWL_MLD_SCAN_REGULAR)
   mld->scan.fw_link_id = link->fw_id;
 } else {
  mld->scan.fw_link_id = IWL_MLD_INVALID_FW_ID;
  params->fw_link_id = IWL_MLD_INVALID_FW_ID;
 }
}

static int
_iwl_mld_single_scan_start(struct iwl_mld *mld, struct ieee80211_vif *vif,
      struct cfg80211_scan_request *req,
      struct ieee80211_scan_ies *ies,
      enum iwl_mld_scan_status scan_status)
{
 struct iwl_host_cmd hcmd = {
  .id = WIDE_ID(LONG_GROUP, SCAN_REQ_UMAC),
  .len = { mld->scan.cmd_size, },
  .data = { mld->scan.cmd, },
  .dataflags = { IWL_HCMD_DFL_NOCOPY, },
 };
 struct iwl_mld_scan_iter_data scan_iter_data = {
  .current_vif = vif,
 };
 struct cfg80211_sched_scan_plan scan_plan = {.iterations = 1};
 struct iwl_mld_scan_params params = {};
 int ret, uid;

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

 if (!iwl_mld_scan_fits(mld, req->n_ssids, ies, req->n_channels))
  return -ENOBUFS;

 ieee80211_iterate_active_interfaces_mtx(mld->hw,
      IEEE80211_IFACE_ITER_NORMAL,
      iwl_mld_scan_iterator,
      &scan_iter_data);

 params.type = iwl_mld_get_scan_type(mld, vif, &scan_iter_data);
 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;

 ether_addr_copy(params.bssid, req->bssid);
 /* TODO: CDB - per-band flag */
 params.respect_p2p_go =
  iwl_mld_get_respect_p2p_go(mld, vif,
        scan_iter_data.global_low_latency);

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

 iwl_mld_scan_set_link_id(mld, vif, ¶ms, req->tsf_report_link_id,
     scan_status);

 iwl_mld_scan_build_probe_req(mld, vif, ies, ¶ms);

 iwl_mld_scan_6ghz_passive_scan(mld, ¶ms, vif);

 uid = iwl_mld_scan_build_cmd(mld, vif, ¶ms, scan_status,
         scan_iter_data.global_low_latency);
 if (uid < 0)
  return uid;

 ret = iwl_mld_send_cmd(mld, &hcmd);
 if (ret) {
  IWL_ERR(mld, "Scan failed! ret %d\n", ret);
  return ret;
 }

 IWL_DEBUG_SCAN(mld, "Scan request send success: status=%u, uid=%u\n",
         scan_status, uid);

 mld->scan.uid_status[uid] = scan_status;
 mld->scan.status |= scan_status;

 if (params.enable_6ghz_passive)
  mld->scan.last_6ghz_passive_jiffies = jiffies;

 return 0;
}

static int
iwl_mld_scan_send_abort_cmd_status(struct iwl_mld *mld, int uid, u32 *status)
{
 struct iwl_umac_scan_abort abort_cmd = {
  .uid = cpu_to_le32(uid),
 };
 struct iwl_host_cmd cmd = {
  .id = WIDE_ID(LONG_GROUP, SCAN_ABORT_UMAC),
  .flags = CMD_WANT_SKB,
  .data = { &abort_cmd },
  .len[0] = sizeof(abort_cmd),
 };
 struct iwl_rx_packet *pkt;
 struct iwl_cmd_response *resp;
 u32 resp_len;
 int ret;

 ret = iwl_mld_send_cmd(mld, &cmd);
 if (ret)
  return ret;

 pkt = cmd.resp_pkt;

 resp_len = iwl_rx_packet_payload_len(pkt);
 if (IWL_FW_CHECK(mld, resp_len != sizeof(*resp),
    "Scan Abort: unexpected response length %d\n",
    resp_len)) {
  ret = -EIO;
  goto out;
 }

 resp = (void *)pkt->data;
 *status = le32_to_cpu(resp->status);

out:
 iwl_free_resp(&cmd);
 return ret;
}

static int
iwl_mld_scan_abort(struct iwl_mld *mld, int type, int uid, bool *wait)
{
 enum iwl_umac_scan_abort_status status;
 int ret;

 *wait = true;

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

 ret = iwl_mld_scan_send_abort_cmd_status(mld, uid, &status);

 IWL_DEBUG_SCAN(mld, "Scan abort: ret=%d status=%u\n", ret, status);

 /* We don't need to wait to scan complete in the following cases:
 * 1. Driver failed to send the scan abort cmd.
 * 2. The FW is no longer familiar with the scan that needs to be
 *    stopped. It is expected that the scan complete notification was
 *    already received but not yet processed.
 *
 * In both cases the flow should continue similar to the case that the
 * scan was really aborted.
 */
 if (ret || status == IWL_UMAC_SCAN_ABORT_STATUS_NOT_FOUND)
  *wait = false;

 return ret;
}

static int
iwl_mld_scan_stop_wait(struct iwl_mld *mld, int type, int uid)
{
 struct iwl_notification_wait wait_scan_done;
 static const u16 scan_comp_notif[] = { SCAN_COMPLETE_UMAC };
 bool wait = true;
 int ret;

 iwl_init_notification_wait(&mld->notif_wait, &wait_scan_done,
       scan_comp_notif,
       ARRAY_SIZE(scan_comp_notif),
       NULL, NULL);

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

 ret = iwl_mld_scan_abort(mld, type, uid, &wait);
 if (ret) {
  IWL_DEBUG_SCAN(mld, "couldn't stop scan type=%d\n", type);
  goto return_no_wait;
 }

 if (!wait) {
  IWL_DEBUG_SCAN(mld, "no need to wait for scan type=%d\n", type);
  goto return_no_wait;
 }

 return iwl_wait_notification(&mld->notif_wait, &wait_scan_done, HZ);

return_no_wait:
 iwl_remove_notification(&mld->notif_wait, &wait_scan_done);
 return ret;
}

int iwl_mld_sched_scan_start(struct iwl_mld *mld,
        struct ieee80211_vif *vif,
        struct cfg80211_sched_scan_request *req,
        struct ieee80211_scan_ies *ies,
        int type)
{
 struct iwl_host_cmd hcmd = {
  .id = WIDE_ID(LONG_GROUP, SCAN_REQ_UMAC),
  .len = { mld->scan.cmd_size, },
  .data = { mld->scan.cmd, },
  .dataflags = { IWL_HCMD_DFL_NOCOPY, },
 };
 struct iwl_mld_scan_params params = {};
 struct iwl_mld_scan_iter_data scan_iter_data = {
  .current_vif = vif,
 };
 bool non_psc_included = false;
 int ret, uid;

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

 /* FW supports only a single periodic scan */
 if (mld->scan.status & (IWL_MLD_SCAN_SCHED | IWL_MLD_SCAN_NETDETECT))
  return -EBUSY;

 ieee80211_iterate_active_interfaces_mtx(mld->hw,
      IEEE80211_IFACE_ITER_NORMAL,
      iwl_mld_scan_iterator,
      &scan_iter_data);

 params.type = iwl_mld_get_scan_type(mld, vif, &scan_iter_data);
 params.flags = req->flags;
 params.n_ssids = req->n_ssids;
 params.ssids = req->ssids;
 params.n_channels = req->n_channels;
 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_mld_scan_pass_all(mld, req);
 params.n_match_sets = req->n_match_sets;
 params.match_sets = req->match_sets;
 params.n_scan_plans = req->n_scan_plans;
 params.scan_plans = req->scan_plans;
 /* TODO: CDB - per-band flag */
 params.respect_p2p_go =
  iwl_mld_get_respect_p2p_go(mld, vif,
        scan_iter_data.global_low_latency);

 /* UMAC scan supports up to 16-bit delays, trim it down to 16-bits */
 params.delay = req->delay > U16_MAX ? U16_MAX : req->delay;

 eth_broadcast_addr(params.bssid);

 ret = iwl_mld_config_sched_scan_profiles(mld, req);
 if (ret)
  return ret;

 iwl_mld_scan_build_probe_req(mld, vif, ies, ¶ms);

 ret = iwl_mld_sched_scan_handle_non_psc_channels(¶ms,
        &non_psc_included);
 if (ret)
  goto out;

 if (!iwl_mld_scan_fits(mld, req->n_ssids, ies, params.n_channels)) {
  ret = -ENOBUFS;
  goto out;
 }

 uid = iwl_mld_scan_build_cmd(mld, vif, ¶ms, type,
         scan_iter_data.global_low_latency);
 if (uid < 0) {
  ret = uid;
  goto out;
 }

 ret = iwl_mld_send_cmd(mld, &hcmd);
 if (!ret) {
  IWL_DEBUG_SCAN(mld,
          "Sched scan request send success: type=%u, uid=%u\n",
          type, uid);
  mld->scan.uid_status[uid] = type;
  mld->scan.status |= type;
 } else {
  IWL_ERR(mld, "Sched scan failed! ret %d\n", ret);
  mld->scan.pass_all_sched_res = SCHED_SCAN_PASS_ALL_STATE_DISABLED;
 }

out:
 if (non_psc_included)
  kfree(params.channels);
 return ret;
}

int iwl_mld_scan_stop(struct iwl_mld *mld, int type, bool notify)
{
 int uid, ret;

 IWL_DEBUG_SCAN(mld,
         "Request to stop scan: type=0x%x, status=0x%x\n",
         type, mld->scan.status);

 if (!(mld->scan.status & type))
  return 0;

 uid = iwl_mld_scan_uid_by_status(mld, type);
 /* must be valid, we just checked it's running */
 if (WARN_ON_ONCE(uid < 0))
  return uid;

 ret = iwl_mld_scan_stop_wait(mld, type, uid);
 if (ret)
  IWL_DEBUG_SCAN(mld, "Failed to stop scan\n");

 /* 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. Also remove the handler to not notify mac80211
 * erroneously after a new scan starts, for example.
 */
 mld->scan.status &= ~type;
 mld->scan.uid_status[uid] = IWL_MLD_SCAN_NONE;
 iwl_mld_cancel_notifications_of_object(mld, IWL_MLD_OBJECT_TYPE_SCAN,
            uid);

 if (type == IWL_MLD_SCAN_REGULAR) {
  if (notify) {
   struct cfg80211_scan_info info = {
    .aborted = true,
   };

   ieee80211_scan_completed(mld->hw, &info);
  }
 } else if (notify) {
  ieee80211_sched_scan_stopped(mld->hw);
  mld->scan.pass_all_sched_res = SCHED_SCAN_PASS_ALL_STATE_DISABLED;
 }

 return ret;
}

int iwl_mld_regular_scan_start(struct iwl_mld *mld, struct ieee80211_vif *vif,
          struct cfg80211_scan_request *req,
          struct ieee80211_scan_ies *ies)
{
 /* Clear survey data when starting the first part of a regular scan */
 if (req->first_part && mld->channel_survey)
  memset(mld->channel_survey->channels, 0,
         sizeof(mld->channel_survey->channels[0]) *
         mld->channel_survey->n_channels);

 if (vif->type == NL80211_IFTYPE_P2P_DEVICE)
  iwl_mld_emlsr_block_tmp_non_bss(mld);

 return _iwl_mld_single_scan_start(mld, vif, req, ies,
       IWL_MLD_SCAN_REGULAR);
}

static void iwl_mld_int_mlo_scan_start(struct iwl_mld *mld,
           struct ieee80211_vif *vif,
           struct ieee80211_channel **channels,
           size_t n_channels)
{
 struct cfg80211_scan_request *req __free(kfree) = NULL;
 struct ieee80211_scan_ies ies = {};
 size_t size;
 int ret;

 IWL_DEBUG_SCAN(mld, "Starting Internal MLO scan: n_channels=%zu\n",
         n_channels);

 size = struct_size(req, channels, n_channels);
 req = kzalloc(size, GFP_KERNEL);
 if (!req)
  return;

 /* set the requested channels */
 for (int i = 0; i < n_channels; i++)
  req->channels[i] = channels[i];

 req->n_channels = n_channels;

 /* set the rates */
 for (int i = 0; i < NUM_NL80211_BANDS; i++)
  if (mld->wiphy->bands[i])
   req->rates[i] =
    (1 << mld->wiphy->bands[i]->n_bitrates) - 1;

 req->wdev = ieee80211_vif_to_wdev(vif);
 req->wiphy = mld->wiphy;
 req->scan_start = jiffies;
 req->tsf_report_link_id = -1;

 ret = _iwl_mld_single_scan_start(mld, vif, req, &ies,
      IWL_MLD_SCAN_INT_MLO);

 if (!ret)
  mld->scan.last_mlo_scan_time = ktime_get_boottime_ns();

 IWL_DEBUG_SCAN(mld, "Internal MLO scan: ret=%d\n", ret);
}

#define IWL_MLD_MLO_SCAN_BLOCKOUT_TIME  5 /* seconds */

void iwl_mld_int_mlo_scan(struct iwl_mld *mld, struct ieee80211_vif *vif)
{
 struct ieee80211_channel *channels[IEEE80211_MLD_MAX_NUM_LINKS];
 struct iwl_mld_vif *mld_vif = iwl_mld_vif_from_mac80211(vif);
 unsigned long usable_links = ieee80211_vif_usable_links(vif);
 size_t n_channels = 0;
 u8 link_id;

 lockdep_assert_wiphy(mld->wiphy);

 if (!IWL_MLD_AUTO_EML_ENABLE || !vif->cfg.assoc ||
     !ieee80211_vif_is_mld(vif) || hweight16(vif->valid_links) == 1)
  return;

 if (mld->scan.status & IWL_MLD_SCAN_INT_MLO) {
  IWL_DEBUG_SCAN(mld, "Internal MLO scan is already running\n");
  return;
 }

 if (mld_vif->last_link_activation_time > ktime_get_boottime_seconds() -
       IWL_MLD_MLO_SCAN_BLOCKOUT_TIME) {
  /* timing doesn't matter much, so use the blockout time */
  wiphy_delayed_work_queue(mld->wiphy,
      &mld_vif->mlo_scan_start_wk,
      IWL_MLD_MLO_SCAN_BLOCKOUT_TIME);
  return;
 }

 for_each_set_bit(link_id, &usable_links, IEEE80211_MLD_MAX_NUM_LINKS) {
  struct ieee80211_bss_conf *link_conf =
   link_conf_dereference_check(vif, link_id);

  if (WARN_ON_ONCE(!link_conf))
   continue;

  channels[n_channels++] = link_conf->chanreq.oper.chan;
 }

 if (!n_channels)
  return;

 iwl_mld_int_mlo_scan_start(mld, vif, channels, n_channels);
}

void iwl_mld_handle_scan_iter_complete_notif(struct iwl_mld *mld,
          struct iwl_rx_packet *pkt)
{
 struct iwl_umac_scan_iter_complete_notif *notif = (void *)pkt->data;
 u32 uid = __le32_to_cpu(notif->uid);

 if (IWL_FW_CHECK(mld, uid >= ARRAY_SIZE(mld->scan.uid_status),
    "FW reports out-of-range scan UID %d\n", uid))
  return;

 if (mld->scan.uid_status[uid] == IWL_MLD_SCAN_REGULAR)
  mld->scan.start_tsf = le64_to_cpu(notif->start_tsf);

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

 if (mld->scan.pass_all_sched_res == SCHED_SCAN_PASS_ALL_STATE_FOUND) {
  IWL_DEBUG_SCAN(mld, "Pass all scheduled scan results found\n");
  ieee80211_sched_scan_results(mld->hw);
  mld->scan.pass_all_sched_res = SCHED_SCAN_PASS_ALL_STATE_ENABLED;
 }

 IWL_DEBUG_SCAN(mld,
         "UMAC Scan iteration complete: scan started at %llu (TSF)\n",
         le64_to_cpu(notif->start_tsf));
}

void iwl_mld_handle_match_found_notif(struct iwl_mld *mld,
          struct iwl_rx_packet *pkt)
{
 IWL_DEBUG_SCAN(mld, "Scheduled scan results\n");
 ieee80211_sched_scan_results(mld->hw);
}

void iwl_mld_handle_scan_complete_notif(struct iwl_mld *mld,
     struct iwl_rx_packet *pkt)
{
 struct iwl_umac_scan_complete *notif = (void *)pkt->data;
 bool aborted = (notif->status == IWL_SCAN_OFFLOAD_ABORTED);
 u32 uid = __le32_to_cpu(notif->uid);

 if (IWL_FW_CHECK(mld, uid >= ARRAY_SIZE(mld->scan.uid_status),
    "FW reports out-of-range scan UID %d\n", uid))
  return;

 IWL_DEBUG_SCAN(mld,
         "Scan completed: uid=%u type=%u, status=%s, EBS=%s\n",
         uid, mld->scan.uid_status[uid],
         notif->status == IWL_SCAN_OFFLOAD_COMPLETED ?
    "completed" : "aborted",
         iwl_mld_scan_ebs_status_str(notif->ebs_status));
 IWL_DEBUG_SCAN(mld, "Scan completed: scan_status=0x%x\n",
         mld->scan.status);
 IWL_DEBUG_SCAN(mld,
         "Scan completed: line=%u, iter=%u, elapsed time=%u\n",
         notif->last_schedule, notif->last_iter,
         __le32_to_cpu(notif->time_from_last_iter));

 if (IWL_FW_CHECK(mld, !(mld->scan.uid_status[uid] & mld->scan.status),
    "FW reports scan UID %d we didn't trigger\n", uid))
  return;

 /* if the scan is already stopping, we don't need to notify mac80211 */
 if (mld->scan.uid_status[uid] == IWL_MLD_SCAN_REGULAR) {
  struct cfg80211_scan_info info = {
   .aborted = aborted,
   .scan_start_tsf = mld->scan.start_tsf,
  };
  int fw_link_id = mld->scan.fw_link_id;
  struct ieee80211_bss_conf *link_conf = NULL;

  if (fw_link_id != IWL_MLD_INVALID_FW_ID)
   link_conf =
    wiphy_dereference(mld->wiphy,
        mld->fw_id_to_bss_conf[fw_link_id]);

  /* It is possible that by the time the scan is complete the
 * link was already removed and is not valid.
 */
  if (link_conf)
   ether_addr_copy(info.tsf_bssid, link_conf->bssid);
  else
   IWL_DEBUG_SCAN(mld, "Scan link is no longer valid\n");

  ieee80211_scan_completed(mld->hw, &info);

  /* Scan is over, we can check again the tpt counters */
  iwl_mld_stop_ignoring_tpt_updates(mld);
 } else if (mld->scan.uid_status[uid] == IWL_MLD_SCAN_SCHED) {
  ieee80211_sched_scan_stopped(mld->hw);
  mld->scan.pass_all_sched_res = SCHED_SCAN_PASS_ALL_STATE_DISABLED;
 } else if (mld->scan.uid_status[uid] == IWL_MLD_SCAN_INT_MLO) {
  IWL_DEBUG_SCAN(mld, "Internal MLO scan completed\n");

  /*
 * We limit link selection to internal MLO scans as otherwise
 * we do not know whether all channels were covered.
 */
  iwl_mld_select_links(mld);
 }

 mld->scan.status &= ~mld->scan.uid_status[uid];

 IWL_DEBUG_SCAN(mld, "Scan completed: after update: scan_status=0x%x\n",
         mld->scan.status);

 mld->scan.uid_status[uid] = IWL_MLD_SCAN_NONE;

 if (notif->ebs_status != IWL_SCAN_EBS_SUCCESS &&
     notif->ebs_status != IWL_SCAN_EBS_INACTIVE)
  mld->scan.last_ebs_failed = true;
}

/* This function is used in nic restart flow, to inform mac80211 about scans
 * that were aborted by restart flow or by an assert.
 */
void iwl_mld_report_scan_aborted(struct iwl_mld *mld)
{
 int uid;

 uid = iwl_mld_scan_uid_by_status(mld, IWL_MLD_SCAN_REGULAR);
 if (uid >= 0) {
  struct cfg80211_scan_info info = {
   .aborted = true,
  };

  ieee80211_scan_completed(mld->hw, &info);
  mld->scan.uid_status[uid] = IWL_MLD_SCAN_NONE;
 }

 uid = iwl_mld_scan_uid_by_status(mld, IWL_MLD_SCAN_SCHED);
 if (uid >= 0) {
  mld->scan.pass_all_sched_res = SCHED_SCAN_PASS_ALL_STATE_DISABLED;
  mld->scan.uid_status[uid] = IWL_MLD_SCAN_NONE;

  /* sched scan will be restarted by mac80211 in reconfig.
 * report to mac80211 that sched scan stopped only if we won't
 * restart the firmware.
 */
  if (!iwlwifi_mod_params.fw_restart)
   ieee80211_sched_scan_stopped(mld->hw);
 }

 uid = iwl_mld_scan_uid_by_status(mld, IWL_MLD_SCAN_INT_MLO);
 if (uid >= 0) {
  IWL_DEBUG_SCAN(mld, "Internal MLO scan aborted\n");
  mld->scan.uid_status[uid] = IWL_MLD_SCAN_NONE;
 }

 BUILD_BUG_ON(IWL_MLD_SCAN_NONE != 0);
 memset(mld->scan.uid_status, 0, sizeof(mld->scan.uid_status));
}

int iwl_mld_alloc_scan_cmd(struct iwl_mld *mld)
{
 u8 scan_cmd_ver = iwl_fw_lookup_cmd_ver(mld->fw, SCAN_REQ_UMAC,
      IWL_FW_CMD_VER_UNKNOWN);
 size_t scan_cmd_size;

 if (scan_cmd_ver == 17) {
  scan_cmd_size = sizeof(struct iwl_scan_req_umac_v17);
 } else {
  IWL_ERR(mld, "Unexpected scan cmd version %d\n", scan_cmd_ver);
  return -EINVAL;
 }

 mld->scan.cmd = kmalloc(scan_cmd_size, GFP_KERNEL);
 if (!mld->scan.cmd)
  return -ENOMEM;

 mld->scan.cmd_size = scan_cmd_size;

 return 0;
}

static int iwl_mld_chanidx_from_phy(struct iwl_mld *mld,
        enum nl80211_band band,
        u16 phy_chan_num)
{
 struct ieee80211_supported_band *sband = mld->wiphy->bands[band];

 if (WARN_ON_ONCE(!sband))
  return -EINVAL;

 for (int chan_idx = 0; chan_idx < sband->n_channels; chan_idx++) {
  struct ieee80211_channel *channel = &sband->channels[chan_idx];

  if (channel->hw_value == phy_chan_num)
   return chan_idx;
 }

 return -EINVAL;
}

void iwl_mld_handle_channel_survey_notif(struct iwl_mld *mld,
      struct iwl_rx_packet *pkt)
{
 const struct iwl_umac_scan_channel_survey_notif *notif =
  (void *)pkt->data;
 struct iwl_mld_survey_channel *info;
 enum nl80211_band band;
 int chan_idx;

 if (!mld->channel_survey) {
  size_t n_channels = 0;

  for (band = 0; band < NUM_NL80211_BANDS; band++) {
   if (!mld->wiphy->bands[band])
    continue;

   n_channels += mld->wiphy->bands[band]->n_channels;
  }

  mld->channel_survey = kzalloc(struct_size(mld->channel_survey,
         channels, n_channels),
         GFP_KERNEL);

  if (!mld->channel_survey)
   return;

  mld->channel_survey->n_channels = n_channels;
  n_channels = 0;
  for (band = 0; band < NUM_NL80211_BANDS; band++) {
   if (!mld->wiphy->bands[band])
    continue;

   mld->channel_survey->bands[band] =
    &mld->channel_survey->channels[n_channels];
   n_channels += mld->wiphy->bands[band]->n_channels;
  }
 }

 band = iwl_mld_phy_band_to_nl80211(le32_to_cpu(notif->band));
 chan_idx = iwl_mld_chanidx_from_phy(mld, band,
         le32_to_cpu(notif->channel));
 if (WARN_ON_ONCE(chan_idx < 0))
  return;

 IWL_DEBUG_SCAN(mld, "channel survey received for freq %d\n",
         mld->wiphy->bands[band]->channels[chan_idx].center_freq);

 info = &mld->channel_survey->bands[band][chan_idx];

 /* Times are all in ms */
 info->time = le32_to_cpu(notif->active_time);
 info->time_busy = le32_to_cpu(notif->busy_time);
 info->noise =
  iwl_average_neg_dbm(notif->noise, ARRAY_SIZE(notif->noise));
}

int iwl_mld_mac80211_get_survey(struct ieee80211_hw *hw, int idx,
    struct survey_info *survey)
{
 struct iwl_mld *mld = IWL_MAC80211_GET_MLD(hw);
 int curr_idx = 0;

 if (!mld->channel_survey)
  return -ENOENT;

 /* Iterate bands/channels to find the requested index.
 * Logically this returns the entry with index "idx" from a flattened
 * survey result array that only contains channels with information.
 * The current index into this flattened array is tracked in curr_idx.
 */
 for (enum nl80211_band band = 0; band < NUM_NL80211_BANDS; band++) {
  struct ieee80211_supported_band *sband =
   mld->wiphy->bands[band];

  if (!sband)
   continue;

  for (int per_band_idx = 0;
       per_band_idx < sband->n_channels;
       per_band_idx++) {
   struct iwl_mld_survey_channel *info =
    &mld->channel_survey->bands[band][per_band_idx];

   /* Skip entry entirely, it was not reported/scanned,
 * do not increase curr_idx for this entry.
 */
   if (!info->time)
    continue;

   /* Search did not reach the requested entry yet,
 * increment curr_idx and continue.
 */
   if (idx != curr_idx) {
    curr_idx++;
    continue;
   }

   /* Found (the next) channel to report */
   survey->channel = &sband->channels[per_band_idx];
   survey->filled = SURVEY_INFO_TIME |
      SURVEY_INFO_TIME_BUSY;
   survey->time = info->time;
   survey->time_busy = info->time_busy;
   survey->noise = info->noise;
   if (survey->noise < 0)
    survey->filled |= SURVEY_INFO_NOISE_DBM;

   return 0;
  }
 }

 return -ENOENT;
}