/******************************************************************************
   *
   * This file is provided under a dual BSD/GPLv2 license.  When using or
   * redistributing this file, you may do so under either license.
   *
   * GPL LICENSE SUMMARY
   *
   * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
   * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of version 2 of the GNU General Public License as
   * published by the Free Software Foundation.
   *
   * This program is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
   * USA
   *
   * The full GNU General Public License is included in this distribution
   * in the file called COPYING.
   *
   * Contact Information:
   *  Intel Linux Wireless <ilw@linux.intel.com>
   * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
   *
   * BSD LICENSE
   *
   * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
   * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   *  * Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *  * Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *  * Neither the name Intel Corporation nor the names of its
   *    contributors may be used to endorse or promote products derived
   *    from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   *
   *****************************************************************************/
  
  #include <linux/etherdevice.h>
  #include <net/mac80211.h>
  
  #include "mvm.h"
  #include "fw-api-scan.h"
  
  #define IWL_DENSE_EBS_SCAN_RATIO 5
  #define IWL_SPARSE_EBS_SCAN_RATIO 1
  
  enum iwl_mvm_scan_type {
  	IWL_SCAN_TYPE_UNASSOC,
  	IWL_SCAN_TYPE_WILD,
  	IWL_SCAN_TYPE_MILD,
  	IWL_SCAN_TYPE_FRAGMENTED,
  };
  
  enum iwl_mvm_traffic_load {
  	IWL_MVM_TRAFFIC_LOW,
  	IWL_MVM_TRAFFIC_MEDIUM,
  	IWL_MVM_TRAFFIC_HIGH,
  };
  
  struct iwl_mvm_scan_timing_params {
  	u32 dwell_active;
  	u32 dwell_passive;
  	u32 dwell_fragmented;
  	u32 suspend_time;
  	u32 max_out_time;
  };
  
  static struct iwl_mvm_scan_timing_params scan_timing[] = {
  	[IWL_SCAN_TYPE_UNASSOC] = {
  		.dwell_active = 10,
  		.dwell_passive = 110,
  		.dwell_fragmented = 44,
  		.suspend_time = 0,
  		.max_out_time = 0,
  	},
  	[IWL_SCAN_TYPE_WILD] = {
  		.dwell_active = 10,
  		.dwell_passive = 110,
  		.dwell_fragmented = 44,
  		.suspend_time = 30,
  		.max_out_time = 120,
  	},
  	[IWL_SCAN_TYPE_MILD] = {
  		.dwell_active = 10,
  		.dwell_passive = 110,
  		.dwell_fragmented = 44,
  		.suspend_time = 120,
  		.max_out_time = 120,
  	},
  	[IWL_SCAN_TYPE_FRAGMENTED] = {
  		.dwell_active = 10,
  		.dwell_passive = 110,
  		.dwell_fragmented = 44,
  		.suspend_time = 95,
  		.max_out_time = 44,
  	},
  };
  
  struct iwl_mvm_scan_params {
  	enum iwl_mvm_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;
  };
  
  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 __le32 iwl_mvm_scan_rxon_flags(enum ieee80211_band band)
  {
  	if (band == IEEE80211_BAND_2GHZ)
  		return cpu_to_le32(PHY_BAND_24);
  	else
  		return cpu_to_le32(PHY_BAND_5);
  }
  
  static inline __le32
  iwl_mvm_scan_rate_n_flags(struct iwl_mvm *mvm, enum ieee80211_band band,
  			  bool no_cck)
  {
  	u32 tx_ant;
  
  	mvm->scan_last_antenna_idx =
  		iwl_mvm_next_antenna(mvm, iwl_mvm_get_valid_tx_ant(mvm),
  				     mvm->scan_last_antenna_idx);
  	tx_ant = BIT(mvm->scan_last_antenna_idx) << RATE_MCS_ANT_POS;
  
  	if (band == IEEE80211_BAND_2GHZ && !no_cck)
  		return cpu_to_le32(IWL_RATE_1M_PLCP | RATE_MCS_CCK_MSK |
  				   tx_ant);
  	else
  		return cpu_to_le32(IWL_RATE_6M_PLCP | tx_ant);
  }
  
  static void iwl_mvm_scan_condition_iterator(void *data, u8 *mac,
  					    struct ieee80211_vif *vif)
  {
  	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
  	int *global_cnt = data;
  
  	if (vif->type != NL80211_IFTYPE_P2P_DEVICE && mvmvif->phy_ctxt &&
  	    mvmvif->phy_ctxt->id < MAX_PHYS)
  		*global_cnt += 1;
  }
  
  static enum iwl_mvm_traffic_load iwl_mvm_get_traffic_load(struct iwl_mvm *mvm)
  {
  	return IWL_MVM_TRAFFIC_LOW;
  }
  
  static enum
  iwl_mvm_scan_type iwl_mvm_get_scan_type(struct iwl_mvm *mvm,
  					struct ieee80211_vif *vif,
  					struct iwl_mvm_scan_params *params)
  {
  	int global_cnt = 0;
  	enum iwl_mvm_traffic_load load;
  	bool low_latency;
  
  	ieee80211_iterate_active_interfaces_atomic(mvm->hw,
  					    IEEE80211_IFACE_ITER_NORMAL,
  					    iwl_mvm_scan_condition_iterator,
  					    &global_cnt);
  	if (!global_cnt)
  		return IWL_SCAN_TYPE_UNASSOC;
  
  	load = iwl_mvm_get_traffic_load(mvm);
  	low_latency = iwl_mvm_low_latency(mvm);
  
  	if ((load == IWL_MVM_TRAFFIC_HIGH || low_latency) &&
  	    vif->type != NL80211_IFTYPE_P2P_DEVICE &&
  	    fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_FRAGMENTED_SCAN))
  		return IWL_SCAN_TYPE_FRAGMENTED;
  
  	if (load >= IWL_MVM_TRAFFIC_MEDIUM || low_latency)
  		return IWL_SCAN_TYPE_MILD;
  
  	return IWL_SCAN_TYPE_WILD;
  }
  
  static inline bool iwl_mvm_rrm_scan_needed(struct iwl_mvm *mvm)
  {
  	/* require rrm scan whenever the fw supports it */
  	return fw_has_capa(&mvm->fw->ucode_capa,
  			   IWL_UCODE_TLV_CAPA_DS_PARAM_SET_IE_SUPPORT);
  }
  
  static int iwl_mvm_max_scan_ie_fw_cmd_room(struct iwl_mvm *mvm)
  {
  	int max_probe_len;
  
  	max_probe_len = SCAN_OFFLOAD_PROBE_REQ_SIZE;
  
  	/* we create the 802.11 header and SSID element */
  	max_probe_len -= 24 + 2;
  
  	/* DS parameter set element is added on 2.4GHZ band if required */
  	if (iwl_mvm_rrm_scan_needed(mvm))
  		max_probe_len -= 3;
  
  	return max_probe_len;
  }
  
  int iwl_mvm_max_scan_ie_len(struct iwl_mvm *mvm)
  {
  	int max_ie_len = iwl_mvm_max_scan_ie_fw_cmd_room(mvm);
  
  	/* TODO: [BUG] This function should return the maximum allowed size of
  	 * scan IEs, however the LMAC scan api contains both 2GHZ and 5GHZ IEs
  	 * in the same command. So the correct implementation of this function
  	 * is just iwl_mvm_max_scan_ie_fw_cmd_room() / 2. Currently the scan
  	 * command has only 512 bytes and it would leave us with about 240
  	 * bytes for scan IEs, which is clearly not enough. So meanwhile
  	 * we will report an incorrect value. This may result in a failure to
  	 * issue a scan in unified_scan_lmac and unified_sched_scan_lmac
  	 * functions with -ENOBUFS, if a large enough probe will be provided.
  	 */
  	return max_ie_len;
  }
  
  static u8 *iwl_mvm_dump_channel_list(struct iwl_scan_results_notif *res,
  				     int num_res, u8 *buf, size_t buf_size)
  {
  	int i;
  	u8 *pos = buf, *end = buf + buf_size;
  
  	for (i = 0; pos < end && i < num_res; i++)
  		pos += snprintf(pos, end - pos, " %u", res[i].channel);
  
  	/* terminate the string in case the buffer was too short */
  	*(buf + buf_size - 1) = '\0';
  
  	return buf;
  }
  
  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;
  	u8 buf[256];
  
  	IWL_DEBUG_SCAN(mvm,
  		       "Scan offload iteration complete: status=0x%x scanned channels=%d channels list: %s
  ",
  		       notif->status, notif->scanned_channels,
  		       iwl_mvm_dump_channel_list(notif->results,
  						 notif->scanned_channels, buf,
  						 sizeof(buf)));
  }
  
  void iwl_mvm_rx_scan_match_found(struct iwl_mvm *mvm,
  				 struct iwl_rx_cmd_buffer *rxb)
  {
  	IWL_DEBUG_SCAN(mvm, "Scheduled scan results
  ");
  	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);
  
  	/* 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
  ",
  			       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
  ",
  			       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
  ",
  			       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
  ",
  			       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)
  ",
  			       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);
  	} else if (mvm->scan_status & IWL_MVM_SCAN_REGULAR) {
  		IWL_DEBUG_SCAN(mvm, "Regular scan %s, EBS status %s (FW)
  ",
  			       aborted ? "aborted" : "completed",
  			       iwl_mvm_ebs_status_str(scan_notif->ebs_status));
  
  		mvm->scan_status &= ~IWL_MVM_SCAN_REGULAR;
  		ieee80211_scan_completed(mvm->hw,
  				scan_notif->status == IWL_SCAN_OFFLOAD_ABORTED);
  		iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
  	}
  
  	mvm->last_ebs_successful =
  			scan_notif->ebs_status == IWL_SCAN_EBS_SUCCESS ||
  			scan_notif->ebs_status == IWL_SCAN_EBS_INACTIVE;
  }
  
  static int iwl_ssid_exist(u8 *ssid, u8 ssid_len, struct iwl_ssid_ie *ssid_list)
  {
  	int i;
  
  	for (i = 0; i < PROBE_OPTION_MAX; i++) {
  		if (!ssid_list[i].len)
  			break;
  		if (ssid_list[i].len == ssid_len &&
  		    !memcmp(ssid_list->ssid, ssid, ssid_len))
  			return i;
  	}
  	return -1;
  }
  
  /* We insert the SSIDs in an inverted order, because the FW will
   * invert it back.
   */
  static void iwl_scan_build_ssids(struct iwl_mvm_scan_params *params,
  				 struct iwl_ssid_ie *ssids,
  				 u32 *ssid_bitmap)
  {
  	int i, j;
  	int index;
  
  	/*
  	 * 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 */
  	*ssid_bitmap = 0;
  	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);
  			*ssid_bitmap |= BIT(i);
  		} else {
  			*ssid_bitmap |= BIT(index);
  		}
  	}
  }
  
  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 *profile_cfg;
  	struct iwl_scan_offload_blacklist *blacklist;
  	struct iwl_host_cmd cmd = {
  		.id = SCAN_OFFLOAD_UPDATE_PROFILES_CMD,
  		.len[1] = sizeof(*profile_cfg),
  		.dataflags[0] = IWL_HCMD_DFL_NOCOPY,
  		.dataflags[1] = IWL_HCMD_DFL_NOCOPY,
  	};
  	int blacklist_len;
  	int i;
  	int ret;
  
  	if (WARN_ON(req->n_match_sets > IWL_SCAN_MAX_PROFILES))
  		return -EIO;
  
  	if (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_SHORT_BL)
  		blacklist_len = IWL_SCAN_SHORT_BLACKLIST_LEN;
  	else
  		blacklist_len = IWL_SCAN_MAX_BLACKLIST_LEN;
  
  	blacklist = kzalloc(sizeof(*blacklist) * blacklist_len, GFP_KERNEL);
  	if (!blacklist)
  		return -ENOMEM;
  
  	profile_cfg = kzalloc(sizeof(*profile_cfg), GFP_KERNEL);
  	if (!profile_cfg) {
  		ret = -ENOMEM;
  		goto free_blacklist;
  	}
  
  	cmd.data[0] = blacklist;
  	cmd.len[0] = sizeof(*blacklist) * blacklist_len;
  	cmd.data[1] = profile_cfg;
  
  	/* No blacklist configuration */
  
  	profile_cfg->num_profiles = req->n_match_sets;
  	profile_cfg->active_clients = SCAN_CLIENT_SCHED_SCAN;
  	profile_cfg->pass_match = SCAN_CLIENT_SCHED_SCAN;
  	profile_cfg->match_notify = SCAN_CLIENT_SCHED_SCAN;
  	if (!req->n_match_sets || !req->match_sets[0].ssid.ssid_len)
  		profile_cfg->any_beacon_notify = SCAN_CLIENT_SCHED_SCAN;
  
  	for (i = 0; i < req->n_match_sets; i++) {
  		profile = &profile_cfg->profiles[i];
  		profile->ssid_index = i;
  		/* Support any cipher and auth algorithm */
  		profile->unicast_cipher = 0xff;
  		profile->auth_alg = 0xff;
  		profile->network_type = IWL_NETWORK_TYPE_ANY;
  		profile->band_selection = IWL_SCAN_OFFLOAD_SELECT_ANY;
  		profile->client_bitmap = SCAN_CLIENT_SCHED_SCAN;
  	}
  
  	IWL_DEBUG_SCAN(mvm, "Sending scheduled scan profile config
  ");
  
  	ret = iwl_mvm_send_cmd(mvm, &cmd);
  	kfree(profile_cfg);
  free_blacklist:
  	kfree(blacklist);
  
  	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
  ",
  			       req->n_match_sets);
  		return false;
  	}
  
  	IWL_DEBUG_SCAN(mvm, "Sending Scheduled scan without filtering
  ");
  	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;
  
  	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.
  ", 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,
  							   IEEE80211_BAND_2GHZ,
  							   no_cck);
  	tx_cmd[0].sta_id = mvm->aux_sta.sta_id;
  
  	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,
  							   IEEE80211_BAND_5GHZ,
  							   no_cck);
  	tx_cmd[1].sta_id = mvm->aux_sta.sta_id;
  }
  
  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_build_scan_probe(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
  			 struct ieee80211_scan_ies *ies,
  			 struct iwl_mvm_scan_params *params)
  {
  	struct ieee80211_mgmt *frame = (void *)params->preq.buf;
  	u8 *pos, *newpos;
  	const u8 *mac_addr = params->flags & NL80211_SCAN_FLAG_RANDOM_ADDR ?
  		params->mac_addr : NULL;
  
  	/*
  	 * Unfortunately, right now the offload scan doesn't support randomising
  	 * within the firmware, so until the firmware API is ready we implement
  	 * it in the driver. This means that the scan iterations won't really be
  	 * random, only when it's restarted, but at least that helps a bit.
  	 */
  	if (mac_addr)
  		get_random_mask_addr(frame->sa, mac_addr,
  				     params->mac_addr_mask);
  	else
  		memcpy(frame->sa, vif->addr, ETH_ALEN);
  
  	frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
  	eth_broadcast_addr(frame->da);
  	eth_broadcast_addr(frame->bssid);
  	frame->seq_ctrl = 0;
  
  	pos = frame->u.probe_req.variable;
  	*pos++ = WLAN_EID_SSID;
  	*pos++ = 0;
  
  	params->preq.mac_header.offset = 0;
  	params->preq.mac_header.len = cpu_to_le16(24 + 2);
  
  	/* Insert ds parameter set element on 2.4 GHz band */
  	newpos = iwl_mvm_copy_and_insert_ds_elem(mvm,
  						 ies->ies[IEEE80211_BAND_2GHZ],
  						 ies->len[IEEE80211_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[IEEE80211_BAND_5GHZ],
  	       ies->len[IEEE80211_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[IEEE80211_BAND_5GHZ]);
  	pos += ies->len[IEEE80211_BAND_5GHZ];
  
  	memcpy(pos, ies->common_ies, ies->common_ie_len);
  	params->preq.common_data.offset = cpu_to_le16(pos - params->preq.buf);
  	params->preq.common_data.len = cpu_to_le16(ies->common_ie_len);
  }
  
  static __le32 iwl_mvm_scan_priority(struct iwl_mvm *mvm,
  				    enum iwl_scan_priority_ext prio)
  {
  	if (fw_has_api(&mvm->fw->ucode_capa,
  		       IWL_UCODE_TLV_API_EXT_SCAN_PRIORITY))
  		return cpu_to_le32(prio);
  
  	if (prio <= IWL_SCAN_PRIORITY_EXT_2)
  		return cpu_to_le32(IWL_SCAN_PRIORITY_LOW);
  
  	if (prio <= IWL_SCAN_PRIORITY_EXT_4)
  		return cpu_to_le32(IWL_SCAN_PRIORITY_MEDIUM);
  
  	return cpu_to_le32(IWL_SCAN_PRIORITY_HIGH);
  }
  
  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 = scan_timing[params->type].dwell_active;
  	cmd->passive_dwell = scan_timing[params->type].dwell_passive;
  	cmd->fragmented_dwell = scan_timing[params->type].dwell_fragmented;
  	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 = iwl_mvm_scan_priority(mvm, IWL_SCAN_PRIORITY_EXT_6);
  }
  
  static inline bool iwl_mvm_scan_fits(struct iwl_mvm *mvm, int n_ssids,
  				     struct ieee80211_scan_ies *ies,
  				     int n_channels)
  {
  	return ((n_ssids <= PROBE_OPTION_MAX) &&
  		(n_channels <= mvm->fw->ucode_capa.n_scan_channels) &
  		(ies->common_ie_len +
  		 ies->len[NL80211_BAND_2GHZ] +
  		 ies->len[NL80211_BAND_5GHZ] <=
  		 iwl_mvm_max_scan_ie_fw_cmd_room(mvm)));
  }
  
  static inline bool iwl_mvm_scan_use_ebs(struct iwl_mvm *mvm,
  					struct ieee80211_vif *vif)
  {
  	const struct iwl_ucode_capabilities *capa = &mvm->fw->ucode_capa;
  
  	/* 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.
  	 */
  	return ((capa->flags & IWL_UCODE_TLV_FLAGS_EBS_SUPPORT) &&
  		mvm->last_ebs_successful &&
  		vif->type != NL80211_IFTYPE_P2P_DEVICE);
  }
  
  static int iwl_mvm_scan_lmac_flags(struct iwl_mvm *mvm,
  				   struct iwl_mvm_scan_params *params)
  {
  	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 (params->type == IWL_SCAN_TYPE_FRAGMENTED)
  		flags |= IWL_MVM_LMAC_SCAN_FLAG_FRAGMENTED;
  
  	if (iwl_mvm_rrm_scan_needed(mvm))
  		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
  
  	return flags;
  }
  
  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 *preq =
  		(void *)(cmd->data + sizeof(struct iwl_scan_channel_cfg_lmac) *
  			 mvm->fw->ucode_capa.n_scan_channels);
  	u32 ssid_bitmap = 0;
  	int i;
  
  	lockdep_assert_held(&mvm->mutex);
  
  	memset(cmd, 0, ksize(cmd));
  
  	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));
  
  	cmd->flags = iwl_mvm_scan_rxon_flags(params->channels[0]->band);
  	cmd->filter_flags = cpu_to_le32(MAC_FILTER_ACCEPT_GRP |
  					MAC_FILTER_IN_BEACON);
  	iwl_mvm_scan_fill_tx_cmd(mvm, cmd->tx_cmd, params->no_cck);
  	iwl_scan_build_ssids(params, cmd->direct_scan, &ssid_bitmap);
  
  	/* this API uses bits 1-20 instead of 0-19 */
  	ssid_bitmap <<= 1;
  
  	for (i = 0; i < params->n_scan_plans; i++) {
  		struct cfg80211_sched_scan_plan *scan_plan =
  			&params->scan_plans[i];
  
  		cmd->schedule[i].delay =
  			cpu_to_le16(scan_plan->interval);
  		cmd->schedule[i].iterations = scan_plan->iterations;
  		cmd->schedule[i].full_scan_mul = 1;
  	}
  
  	/*
  	 * If the number of iterations of the last scan plan is set to
  	 * zero, it should run infinitely. However, this is not always the case.
  	 * For example, when regular scan is requested the driver sets one scan
  	 * plan with one iteration.
  	 */
  	if (!cmd->schedule[i - 1].iterations)
  		cmd->schedule[i - 1].iterations = 0xff;
  
  	if (iwl_mvm_scan_use_ebs(mvm, vif)) {
  		cmd->channel_opt[0].flags =
  			cpu_to_le16(IWL_SCAN_CHANNEL_FLAG_EBS |
  				    IWL_SCAN_CHANNEL_FLAG_EBS_ACCURATE |
  				    IWL_SCAN_CHANNEL_FLAG_CACHE_ADD);
  		cmd->channel_opt[0].non_ebs_ratio =
  			cpu_to_le16(IWL_DENSE_EBS_SCAN_RATIO);
  		cmd->channel_opt[1].flags =
  			cpu_to_le16(IWL_SCAN_CHANNEL_FLAG_EBS |
  				    IWL_SCAN_CHANNEL_FLAG_EBS_ACCURATE |
  				    IWL_SCAN_CHANNEL_FLAG_CACHE_ADD);
  		cmd->channel_opt[1].non_ebs_ratio =
  			cpu_to_le16(IWL_SPARSE_EBS_SCAN_RATIO);
  	}
  
  	iwl_mvm_lmac_scan_cfg_channels(mvm, params->channels,
  				       params->n_channels, ssid_bitmap, cmd);
  
  	*preq = params->preq;
  
  	return 0;
  }
  
  static int rate_to_scan_rate_flag(unsigned int rate)
  {
  	static const int rate_to_scan_rate[IWL_RATE_COUNT] = {
  		[IWL_RATE_1M_INDEX]	= SCAN_CONFIG_RATE_1M,
  		[IWL_RATE_2M_INDEX]	= SCAN_CONFIG_RATE_2M,
  		[IWL_RATE_5M_INDEX]	= SCAN_CONFIG_RATE_5M,
  		[IWL_RATE_11M_INDEX]	= SCAN_CONFIG_RATE_11M,
  		[IWL_RATE_6M_INDEX]	= SCAN_CONFIG_RATE_6M,
  		[IWL_RATE_9M_INDEX]	= SCAN_CONFIG_RATE_9M,
  		[IWL_RATE_12M_INDEX]	= SCAN_CONFIG_RATE_12M,
  		[IWL_RATE_18M_INDEX]	= SCAN_CONFIG_RATE_18M,
  		[IWL_RATE_24M_INDEX]	= SCAN_CONFIG_RATE_24M,
  		[IWL_RATE_36M_INDEX]	= SCAN_CONFIG_RATE_36M,
  		[IWL_RATE_48M_INDEX]	= SCAN_CONFIG_RATE_48M,
  		[IWL_RATE_54M_INDEX]	= SCAN_CONFIG_RATE_54M,
  	};
  
  	return rate_to_scan_rate[rate];
  }
  
  static __le32 iwl_mvm_scan_config_rates(struct iwl_mvm *mvm)
  {
  	struct ieee80211_supported_band *band;
  	unsigned int rates = 0;
  	int i;
  
  	band = &mvm->nvm_data->bands[IEEE80211_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[IEEE80211_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);
  }
  
  int iwl_mvm_config_scan(struct iwl_mvm *mvm)
  {
  	struct iwl_scan_config *scan_config;
  	struct ieee80211_supported_band *band;
  	int num_channels =
  		mvm->nvm_data->bands[IEEE80211_BAND_2GHZ].n_channels +
  		mvm->nvm_data->bands[IEEE80211_BAND_5GHZ].n_channels;
  	int ret, i, j = 0, cmd_size;
  	struct iwl_host_cmd cmd = {
  		.id = iwl_cmd_id(SCAN_CFG_CMD, IWL_ALWAYS_LONG_GROUP, 0),
  	};
  
  	if (WARN_ON(num_channels > mvm->fw->ucode_capa.n_scan_channels))
  		return -ENOBUFS;
  
  	cmd_size = sizeof(*scan_config) + mvm->fw->ucode_capa.n_scan_channels;
  
  	scan_config = kzalloc(cmd_size, GFP_KERNEL);
  	if (!scan_config)
  		return -ENOMEM;
  
  	scan_config->flags = cpu_to_le32(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_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));
  	scan_config->tx_chains = cpu_to_le32(iwl_mvm_get_valid_tx_ant(mvm));
  	scan_config->rx_chains = cpu_to_le32(iwl_mvm_scan_rx_ant(mvm));
  	scan_config->legacy_rates = iwl_mvm_scan_config_rates(mvm);
  	scan_config->out_of_channel_time = cpu_to_le32(170);
  	scan_config->suspend_time = cpu_to_le32(30);
  	scan_config->dwell_active = 20;
  	scan_config->dwell_passive = 110;
  	scan_config->dwell_fragmented = 20;
  
  	memcpy(&scan_config->mac_addr, &mvm->addresses[0].addr, ETH_ALEN);
  
  	scan_config->bcast_sta_id = mvm->aux_sta.sta_id;
  	scan_config->channel_flags = IWL_CHANNEL_FLAG_EBS |
  				     IWL_CHANNEL_FLAG_ACCURATE_EBS |
  				     IWL_CHANNEL_FLAG_EBS_ADD |
  				     IWL_CHANNEL_FLAG_PRE_SCAN_PASSIVE2ACTIVE;
  
  	band = &mvm->nvm_data->bands[IEEE80211_BAND_2GHZ];
  	for (i = 0; i < band->n_channels; i++, j++)
  		scan_config->channel_array[j] = band->channels[i].hw_value;
  	band = &mvm->nvm_data->bands[IEEE80211_BAND_5GHZ];
  	for (i = 0; i < band->n_channels; i++, j++)
  		scan_config->channel_array[j] = band->channels[i].hw_value;
  
  	cmd.data[0] = scan_config;
  	cmd.len[0] = cmd_size;
  	cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
  
  	IWL_DEBUG_SCAN(mvm, "Sending UMAC scan config
  ");
  
  	ret = iwl_mvm_send_cmd(mvm, &cmd);
  
  	kfree(scan_config);
  	return ret;
  }
  
  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 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 void iwl_mvm_scan_umac_dwell(struct iwl_mvm *mvm,
  				    struct iwl_scan_req_umac *cmd,
  				    struct iwl_mvm_scan_params *params)
  {
  	cmd->active_dwell = scan_timing[params->type].dwell_active;
  	cmd->passive_dwell = scan_timing[params->type].dwell_passive;
  	cmd->fragmented_dwell = scan_timing[params->type].dwell_fragmented;
  	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_priority =
  		iwl_mvm_scan_priority(mvm, IWL_SCAN_PRIORITY_EXT_6);
  
  	if (iwl_mvm_is_regular_scan(params))
  		cmd->ooc_priority =
  			iwl_mvm_scan_priority(mvm, IWL_SCAN_PRIORITY_EXT_6);
  	else
  		cmd->ooc_priority =
  			iwl_mvm_scan_priority(mvm, IWL_SCAN_PRIORITY_EXT_2);
  }
  
  static void
  iwl_mvm_umac_scan_cfg_channels(struct iwl_mvm *mvm,
  			       struct ieee80211_channel **channels,
  			       int n_channels, u32 ssid_bitmap,
  			       struct iwl_scan_req_umac *cmd)
  {
  	struct iwl_scan_channel_cfg_umac *channel_cfg = (void *)&cmd->data;
  	int i;
  
  	for (i = 0; i < n_channels; i++) {
  		channel_cfg[i].flags = cpu_to_le32(ssid_bitmap);
  		channel_cfg[i].channel_num = channels[i]->hw_value;
  		channel_cfg[i].iter_count = 1;
  		channel_cfg[i].iter_interval = 0;
  	}
  }
  
  static u32 iwl_mvm_scan_umac_flags(struct iwl_mvm *mvm,
  				   struct iwl_mvm_scan_params *params)
  {
  	int 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 (params->type == IWL_SCAN_TYPE_FRAGMENTED)
  		flags |= IWL_UMAC_SCAN_GEN_FLAGS_FRAGMENTED;
  
  	if (iwl_mvm_rrm_scan_needed(mvm))
  		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;
  
  #ifdef CONFIG_IWLWIFI_DEBUGFS
  	if (mvm->scan_iter_notif_enabled)
  		flags |= IWL_UMAC_SCAN_GEN_FLAGS_ITER_COMPLETE;
  #endif
  	return flags;
  }
  
  static int iwl_mvm_scan_umac(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
  			     struct iwl_mvm_scan_params *params,
  			     int type)
  {
  	struct iwl_scan_req_umac *cmd = mvm->scan_cmd;
  	struct iwl_scan_req_umac_tail *sec_part = (void *)&cmd->data +
  		sizeof(struct iwl_scan_channel_cfg_umac) *
  			mvm->fw->ucode_capa.n_scan_channels;
  	int uid, i;
  	u32 ssid_bitmap = 0;
  
  	lockdep_assert_held(&mvm->mutex);
  
  	if (WARN_ON(params->n_scan_plans > IWL_MAX_SCHED_SCAN_PLANS))
  		return -EINVAL;
  
  	uid = iwl_mvm_scan_uid_by_status(mvm, 0);
  	if (uid < 0)
  		return uid;
  
  	memset(cmd, 0, ksize(cmd));
  
  	iwl_mvm_scan_umac_dwell(mvm, cmd, params);
  
  	mvm->scan_uid_status[uid] = type;
  
  	cmd->uid = cpu_to_le32(uid);
  	cmd->general_flags = cpu_to_le32(iwl_mvm_scan_umac_flags(mvm, params));
  
  	if (type == IWL_MVM_SCAN_SCHED)
  		cmd->flags = cpu_to_le32(IWL_UMAC_SCAN_FLAG_PREEMPTIVE);
  
  	if (iwl_mvm_scan_use_ebs(mvm, vif))
  		cmd->channel_flags = IWL_SCAN_CHANNEL_FLAG_EBS |
  				     IWL_SCAN_CHANNEL_FLAG_EBS_ACCURATE |
  				     IWL_SCAN_CHANNEL_FLAG_CACHE_ADD;
  
  	cmd->n_channels = params->n_channels;
  
  	iwl_scan_build_ssids(params, sec_part->direct_scan, &ssid_bitmap);
  
  	iwl_mvm_umac_scan_cfg_channels(mvm, params->channels,
  				       params->n_channels, ssid_bitmap, cmd);
  
  	for (i = 0; i < params->n_scan_plans; i++) {
  		struct cfg80211_sched_scan_plan *scan_plan =
  			&params->scan_plans[i];
  
  		sec_part->schedule[i].iter_count = scan_plan->iterations;
  		sec_part->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 (!sec_part->schedule[i - 1].iter_count)
  		sec_part->schedule[i - 1].iter_count = 0xff;
  
  	sec_part->delay = cpu_to_le16(params->delay);
  	sec_part->preq = params->preq;
  
  	return 0;
  }
  
  static int iwl_mvm_num_scans(struct iwl_mvm *mvm)
  {
  	return hweight32(mvm->scan_status & IWL_MVM_SCAN_MASK);
  }
  
  static int iwl_mvm_check_running_scans(struct iwl_mvm *mvm, int type)
  {
  	/* This looks a bit arbitrary, but the idea is that if we run
  	 * out of possible simultaneous scans and the userspace is
  	 * trying to run a scan type that is already running, we
  	 * return -EBUSY.  But if the userspace wants to start a
  	 * different type of scan, we stop the opposite type to make
  	 * space for the new request.  The reason is backwards
  	 * compatibility with old wpa_supplicant that wouldn't stop a
  	 * scheduled scan before starting a normal scan.
  	 */
  
  	if (iwl_mvm_num_scans(mvm) < mvm->max_scans)
  		return 0;
  
  	/* Use a switch, even though this is a bitmask, so that more
  	 * than one bits set will fall in default and we will warn.
  	 */
  	switch (type) {
  	case IWL_MVM_SCAN_REGULAR:
  		if (mvm->scan_status & IWL_MVM_SCAN_REGULAR_MASK)
  			return -EBUSY;
  		return iwl_mvm_scan_stop(mvm, IWL_MVM_SCAN_SCHED, true);
  	case IWL_MVM_SCAN_SCHED:
  		if (mvm->scan_status & IWL_MVM_SCAN_SCHED_MASK)
  			return -EBUSY;
  		iwl_mvm_scan_stop(mvm, IWL_MVM_SCAN_REGULAR, true);
  	case IWL_MVM_SCAN_NETDETECT:
  		/* No need to stop anything for net-detect since the
  		 * firmware is restarted anyway.  This way, any sched
  		 * scans that were running will be restarted when we
  		 * resume.
  		*/
  		return 0;
  	default:
  		WARN_ON(1);
  		break;
  	}
  
  	return -EIO;
  }
  
  int iwl_mvm_reg_scan_start(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
  			   struct cfg80211_scan_request *req,
  			   struct ieee80211_scan_ies *ies)
  {
  	struct iwl_host_cmd hcmd = {
  		.len = { iwl_mvm_scan_size(mvm), },
  		.data = { mvm->scan_cmd, },
  		.dataflags = { IWL_HCMD_DFL_NOCOPY, },
  	};
  	struct iwl_mvm_scan_params params = {};
  	int ret;
  	struct cfg80211_sched_scan_plan scan_plan = { .iterations = 1 };
  
  	lockdep_assert_held(&mvm->mutex);
  
  	if (iwl_mvm_is_lar_supported(mvm) && !mvm->lar_regdom_set) {
  		IWL_ERR(mvm, "scan while LAR regdomain is not set
  ");
  		return -EBUSY;
  	}
  
  	ret = iwl_mvm_check_running_scans(mvm, IWL_MVM_SCAN_REGULAR);
  	if (ret)
  		return ret;
  
  	/* we should have failed registration if scan_cmd was NULL */
  	if (WARN_ON(!mvm->scan_cmd))
  		return -ENOMEM;
  
  	if (!iwl_mvm_scan_fits(mvm, req->n_ssids, ies, req->n_channels))
  		return -ENOBUFS;
  
  	params.n_ssids = req->n_ssids;
  	params.flags = req->flags;
  	params.n_channels = req->n_channels;
  	params.delay = 0;
  	params.ssids = req->ssids;
  	params.channels = req->channels;
  	params.mac_addr = req->mac_addr;
  	params.mac_addr_mask = req->mac_addr_mask;
  	params.no_cck = req->no_cck;
  	params.pass_all = true;
  	params.n_match_sets = 0;
  	params.match_sets = NULL;
  
  	params.scan_plans = &scan_plan;
  	params.n_scan_plans = 1;
  
  	params.type = iwl_mvm_get_scan_type(mvm, vif, &params);
  
  	iwl_mvm_build_scan_probe(mvm, vif, ies, &params);
  
  	if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_UMAC_SCAN)) {
  		hcmd.id = iwl_cmd_id(SCAN_REQ_UMAC, IWL_ALWAYS_LONG_GROUP, 0);
  		ret = iwl_mvm_scan_umac(mvm, vif, &params,
  					IWL_MVM_SCAN_REGULAR);
  	} else {
  		hcmd.id = SCAN_OFFLOAD_REQUEST_CMD;
  		ret = iwl_mvm_scan_lmac(mvm, vif, &params);
  	}
  
  	if (ret)
  		return ret;
  
  	ret = iwl_mvm_send_cmd(mvm, &hcmd);
  	if (ret) {
  		/* If the scan failed, it usually means that the FW was unable
  		 * to allocate the time events. Warn on it, but maybe we
  		 * should try to send the command again with different params.
  		 */
  		IWL_ERR(mvm, "Scan failed! ret %d
  ", ret);
  		return ret;
  	}
  
  	IWL_DEBUG_SCAN(mvm, "Scan request was sent successfully
  ");
  	mvm->scan_status |= IWL_MVM_SCAN_REGULAR;
  	iwl_mvm_ref(mvm, IWL_MVM_REF_SCAN);
  
  	return 0;
  }
  
  int iwl_mvm_sched_scan_start(struct iwl_mvm *mvm,
  			     struct ieee80211_vif *vif,
  			     struct cfg80211_sched_scan_request *req,
  			     struct ieee80211_scan_ies *ies,
  			     int type)
  {
  	struct iwl_host_cmd hcmd = {
  		.len = { iwl_mvm_scan_size(mvm), },
  		.data = { mvm->scan_cmd, },
  		.dataflags = { IWL_HCMD_DFL_NOCOPY, },
  	};
  	struct iwl_mvm_scan_params params = {};
  	int ret;
  
  	lockdep_assert_held(&mvm->mutex);
  
  	if (iwl_mvm_is_lar_supported(mvm) && !mvm->lar_regdom_set) {
  		IWL_ERR(mvm, "sched-scan while LAR regdomain is not set
  ");
  		return -EBUSY;
  	}
  
  	/* we don't support "match all" in the firmware */
  	if (!req->n_match_sets)
  		return -EOPNOTSUPP;
  
  	ret = iwl_mvm_check_running_scans(mvm, type);
  	if (ret)
  		return ret;
  
  	/* we should have failed registration if scan_cmd was NULL */
  	if (WARN_ON(!mvm->scan_cmd))
  		return -ENOMEM;
  
  	if (!iwl_mvm_scan_fits(mvm, req->n_ssids, ies, req->n_channels))
  		return -ENOBUFS;
  
  	params.n_ssids = req->n_ssids;
  	params.flags = req->flags;
  	params.n_channels = req->n_channels;
  	params.ssids = req->ssids;
  	params.channels = req->channels;
  	params.mac_addr = req->mac_addr;
  	params.mac_addr_mask = req->mac_addr_mask;
  	params.no_cck = false;
  	params.pass_all =  iwl_mvm_scan_pass_all(mvm, req);
  	params.n_match_sets = req->n_match_sets;
  	params.match_sets = req->match_sets;
  	if (!req->n_scan_plans)
  		return -EINVAL;
  
  	params.n_scan_plans = req->n_scan_plans;
  	params.scan_plans = req->scan_plans;
  
  	params.type = iwl_mvm_get_scan_type(mvm, vif, &params);
  
  	/* In theory, LMAC scans can handle a 32-bit delay, but since
  	 * waiting for over 18 hours to start the scan is a bit silly
  	 * and to keep it aligned with UMAC scans (which only support
  	 * 16-bit delays), trim it down to 16-bits.
  	 */
  	if (req->delay > U16_MAX) {
  		IWL_DEBUG_SCAN(mvm,
  			       "delay value is > 16-bits, set to max possible
  ");
  		params.delay = U16_MAX;
  	} else {
  		params.delay = req->delay;
  	}
  
  	ret = iwl_mvm_config_sched_scan_profiles(mvm, req);
  	if (ret)
  		return ret;
  
  	iwl_mvm_build_scan_probe(mvm, vif, ies, &params);
  
  	if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_UMAC_SCAN)) {
  		hcmd.id = iwl_cmd_id(SCAN_REQ_UMAC, IWL_ALWAYS_LONG_GROUP, 0);
  		ret = iwl_mvm_scan_umac(mvm, vif, &params, IWL_MVM_SCAN_SCHED);
  	} else {
  		hcmd.id = SCAN_OFFLOAD_REQUEST_CMD;
  		ret = iwl_mvm_scan_lmac(mvm, vif, &params);
  	}
  
  	if (ret)
  		return ret;
  
  	ret = iwl_mvm_send_cmd(mvm, &hcmd);
  	if (!ret) {
  		IWL_DEBUG_SCAN(mvm,
  			       "Sched scan request was sent successfully
  ");
  		mvm->scan_status |= type;
  	} else {
  		/* If the scan failed, it usually means that the FW was unable
  		 * to allocate the time events. Warn on it, but maybe we
  		 * should try to send the command again with different params.
  		 */
  		IWL_ERR(mvm, "Sched scan failed! ret %d
  ", ret);
  	}
  
  	return ret;
  }
  
  void iwl_mvm_rx_umac_scan_complete_notif(struct iwl_mvm *mvm,
  					 struct iwl_rx_cmd_buffer *rxb)
  {
  	struct iwl_rx_packet *pkt = rxb_addr(rxb);
  	struct iwl_umac_scan_complete *notif = (void *)pkt->data;
  	u32 uid = __le32_to_cpu(notif->uid);
  	bool aborted = (notif->status == IWL_SCAN_OFFLOAD_ABORTED);
  
  	if (WARN_ON(!(mvm->scan_uid_status[uid] & mvm->scan_status)))
  		return;
  
  	/* if the scan is already stopping, we don't need to notify mac80211 */
  	if (mvm->scan_uid_status[uid] == IWL_MVM_SCAN_REGULAR) {
  		ieee80211_scan_completed(mvm->hw, aborted);
  		iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
  	} else if (mvm->scan_uid_status[uid] == IWL_MVM_SCAN_SCHED) {
  		ieee80211_sched_scan_stopped(mvm->hw);
  	}
  
  	mvm->scan_status &= ~mvm->scan_uid_status[uid];
  	IWL_DEBUG_SCAN(mvm,
  		       "Scan completed, uid %u type %u, status %s, EBS status %s
  ",
  		       uid, mvm->scan_uid_status[uid],
  		       notif->status == IWL_SCAN_OFFLOAD_COMPLETED ?
  				"completed" : "aborted",
  		       iwl_mvm_ebs_status_str(notif->ebs_status));
  	IWL_DEBUG_SCAN(mvm,
  		       "Last line %d, Last iteration %d, Time from last iteration %d
  ",
  		       notif->last_schedule, notif->last_iter,
  		       __le32_to_cpu(notif->time_from_last_iter));
  
  	if (notif->ebs_status != IWL_SCAN_EBS_SUCCESS &&
  	    notif->ebs_status != IWL_SCAN_EBS_INACTIVE)
  		mvm->last_ebs_successful = false;
  
  	mvm->scan_uid_status[uid] = 0;
  }
  
  void iwl_mvm_rx_umac_scan_iter_complete_notif(struct iwl_mvm *mvm,
  					      struct iwl_rx_cmd_buffer *rxb)
  {
  	struct iwl_rx_packet *pkt = rxb_addr(rxb);
  	struct iwl_umac_scan_iter_complete_notif *notif = (void *)pkt->data;
  	u8 buf[256];
  
  	IWL_DEBUG_SCAN(mvm,
  		       "UMAC Scan iteration complete: status=0x%x scanned_channels=%d channels list: %s
  ",
  		       notif->status, notif->scanned_channels,
  		       iwl_mvm_dump_channel_list(notif->results,
  						 notif->scanned_channels, buf,
  						 sizeof(buf)));
  }
  
  static int iwl_mvm_umac_scan_abort(struct iwl_mvm *mvm, int type)
  {
  	struct iwl_umac_scan_abort cmd = {};
  	int uid, ret;
  
  	lockdep_assert_held(&mvm->mutex);
  
  	/* We should always get a valid index here, because we already
  	 * checked that this type of scan was running in the generic
  	 * code.
  	 */
  	uid = iwl_mvm_scan_uid_by_status(mvm, type);
  	if (WARN_ON_ONCE(uid < 0))
  		return uid;
  
  	cmd.uid = cpu_to_le32(uid);
  
  	IWL_DEBUG_SCAN(mvm, "Sending scan abort, uid %u
  ", uid);
  
  	ret = iwl_mvm_send_cmd_pdu(mvm,
  				   iwl_cmd_id(SCAN_ABORT_UMAC,
  					      IWL_ALWAYS_LONG_GROUP, 0),
  				   0, sizeof(cmd), &cmd);
  	if (!ret)
  		mvm->scan_uid_status[uid] = type << IWL_MVM_SCAN_STOPPING_SHIFT;
  
  	return ret;
  }
  
  static int iwl_mvm_scan_stop_wait(struct iwl_mvm *mvm, int type)
  {
  	struct iwl_notification_wait wait_scan_done;
  	static const u16 scan_done_notif[] = { SCAN_COMPLETE_UMAC,
  					      SCAN_OFFLOAD_COMPLETE, };
  	int ret;
  
  	lockdep_assert_held(&mvm->mutex);
  
  	iwl_init_notification_wait(&mvm->notif_wait, &wait_scan_done,
  				   scan_done_notif,
  				   ARRAY_SIZE(scan_done_notif),
  				   NULL, NULL);
  
  	IWL_DEBUG_SCAN(mvm, "Preparing to stop scan, type %x
  ", type);
  
  	if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_UMAC_SCAN))
  		ret = iwl_mvm_umac_scan_abort(mvm, type);
  	else
  		ret = iwl_mvm_lmac_scan_abort(mvm);
  
  	if (ret) {
  		IWL_DEBUG_SCAN(mvm, "couldn't stop scan type %d
  ", type);
  		iwl_remove_notification(&mvm->notif_wait, &wait_scan_done);
  		return ret;
  	}
  
  	ret = iwl_wait_notification(&mvm->notif_wait, &wait_scan_done, 1 * HZ);
  
  	return ret;
  }
  
  int iwl_mvm_scan_size(struct iwl_mvm *mvm)
  {
  	if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_UMAC_SCAN))
  		return sizeof(struct iwl_scan_req_umac) +
  			sizeof(struct iwl_scan_channel_cfg_umac) *
  				mvm->fw->ucode_capa.n_scan_channels +
  			sizeof(struct iwl_scan_req_umac_tail);
  
  	return sizeof(struct iwl_scan_req_lmac) +
  		sizeof(struct iwl_scan_channel_cfg_lmac) *
  		mvm->fw->ucode_capa.n_scan_channels +
  		sizeof(struct iwl_scan_probe_req);
  }
  
  /*
   * This function is used in nic restart flow, to inform mac80211 about scans
   * that was aborted by restart flow or by an assert.
   */
  void iwl_mvm_report_scan_aborted(struct iwl_mvm *mvm)
  {
  	if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_UMAC_SCAN)) {
  		int uid, i;
  
  		uid = iwl_mvm_scan_uid_by_status(mvm, IWL_MVM_SCAN_REGULAR);
  		if (uid >= 0) {
  			ieee80211_scan_completed(mvm->hw, true);
  			mvm->scan_uid_status[uid] = 0;
  		}
  		uid = iwl_mvm_scan_uid_by_status(mvm, IWL_MVM_SCAN_SCHED);
  		if (uid >= 0 && !mvm->restart_fw) {
  			ieee80211_sched_scan_stopped(mvm->hw);
  			mvm->scan_uid_status[uid] = 0;
  		}
  
  		/* We shouldn't have any UIDs still set.  Loop over all the
  		 * UIDs to make sure there's nothing left there and warn if
  		 * any is found.
  		 */
  		for (i = 0; i < mvm->max_scans; i++) {
  			if (WARN_ONCE(mvm->scan_uid_status[i],
  				      "UMAC scan UID %d status was not cleaned
  ",
  				      i))
  				mvm->scan_uid_status[i] = 0;
  		}
  	} else {
  		if (mvm->scan_status & IWL_MVM_SCAN_REGULAR)
  			ieee80211_scan_completed(mvm->hw, true);
  
  		/* Sched scan will be restarted by mac80211 in
  		 * restart_hw, so do not report if FW is about to be
  		 * restarted.
  		 */
  		if ((mvm->scan_status & IWL_MVM_SCAN_SCHED) && !mvm->restart_fw)
  			ieee80211_sched_scan_stopped(mvm->hw);
  	}
  }
  
  int iwl_mvm_scan_stop(struct iwl_mvm *mvm, int type, bool notify)
  {
  	int ret;
  
  	if (!(mvm->scan_status & type))
  		return 0;
  
  	if (iwl_mvm_is_radio_killed(mvm)) {
  		ret = 0;
  		goto out;
  	}
  
  	ret = iwl_mvm_scan_stop_wait(mvm, type);
  	if (!ret)
  		mvm->scan_status |= type << IWL_MVM_SCAN_STOPPING_SHIFT;
  out:
  	/* Clear the scan status so the next scan requests will
  	 * succeed and mark the scan as stopping, so that the Rx
  	 * handler doesn't do anything, as the scan was stopped from
  	 * above.
  	 */
  	mvm->scan_status &= ~type;
  
  	if (type == IWL_MVM_SCAN_REGULAR) {
  		/* Since the rx handler won't do anything now, we have
  		 * to release the scan reference here.
  		 */
  		iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
  		if (notify)
  			ieee80211_scan_completed(mvm->hw, true);
  	} else if (notify) {
  		ieee80211_sched_scan_stopped(mvm->hw);
  	}
  
  	return ret;
  }