Merge tag 'iwlwifi-next-for-kalle-2015-08-04' of https://git.kernel.org/pub/scm/linux...

[mirror_ubuntu-zesty-kernel.git] / drivers / net / wireless / iwlwifi / mvm / scan.c

/******************************************************************************
 *
 * 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,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *****************************************************************************/

#include <linux/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

struct iwl_mvm_scan_params {
        u32 max_out_time;
        u32 suspend_time;
        bool passive_fragmented;
        u32 n_channels;
        u16 delay;
        int n_ssids;
        struct cfg80211_ssid *ssids;
        struct ieee80211_channel **channels;
        u16 interval; /* interval between scans (in secs) */
        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;
        u16 passive_dwell;
        u16 active_dwell;
        u16 fragmented_dwell;
        struct {
                u8 iterations;
                u8 full_scan_mul; /* not used for UMAC */
        } schedule[2];
};

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 void iwl_mvm_scan_calc_dwell(struct iwl_mvm *mvm,
                                    struct ieee80211_vif *vif,
                                    struct iwl_mvm_scan_params *params)
{
        int global_cnt = 0;
        u8 frag_passive_dwell = 0;

        ieee80211_iterate_active_interfaces_atomic(mvm->hw,
                                            IEEE80211_IFACE_ITER_NORMAL,
                                            iwl_mvm_scan_condition_iterator,
                                            &global_cnt);
        if (!global_cnt)
                goto not_bound;

        params->suspend_time = 30;
        params->max_out_time = 120;

        if (iwl_mvm_low_latency(mvm)) {
                if (fw_has_api(&mvm->fw->ucode_capa,
                               IWL_UCODE_TLV_API_FRAGMENTED_SCAN)) {

                        params->suspend_time = 105;
                        /*
                         * If there is more than one active interface make
                         * passive scan more fragmented.
                         */
                        frag_passive_dwell = 40;
                        params->max_out_time = frag_passive_dwell;
                } else {
                        params->suspend_time = 120;
                        params->max_out_time = 120;
                }
        }

        if (frag_passive_dwell &&
            fw_has_api(&mvm->fw->ucode_capa,
                       IWL_UCODE_TLV_API_FRAGMENTED_SCAN)) {
                /*
                 * P2P device scan should not be fragmented to avoid negative
                 * impact on P2P device discovery. Configure max_out_time to be
                 * equal to dwell time on passive channel.
                 */
                if (vif->type == NL80211_IFTYPE_P2P_DEVICE) {
                        params->max_out_time = 120;
                } else {
                        params->passive_fragmented = true;
                }
        }

        if ((params->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) &&
            (params->max_out_time > 200))
                params->max_out_time = 200;

not_bound:

        if (params->passive_fragmented)
                params->fragmented_dwell = frag_passive_dwell;

        /*
         * use only basic dwell time in scan command, regardless of the band or
         * the number of the probes. FW will calculate the actual dwell time.
         */
        params->passive_dwell = 110;
        params->active_dwell = 10;


        IWL_DEBUG_SCAN(mvm,
                       "scan parameters: max_out_time %d, suspend_time %d, passive_fragmented %d\n",
                       params->max_out_time, params->suspend_time,
                       params->passive_fragmented);
}

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\n",
                       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\n");
        ieee80211_sched_scan_results(mvm->hw);
}

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

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

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

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

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

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

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

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

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

                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)\n",
                               aborted ? "aborted" : "completed",
                               iwl_mvm_ebs_status_str(scan_notif->ebs_status));

                mvm->scan_status &= ~IWL_MVM_SCAN_REGULAR;
                ieee80211_scan_completed(mvm->hw,
                                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\n");

        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\n",
                               req->n_match_sets);
                return false;
        }

        IWL_DEBUG_SCAN(mvm, "Sending Scheduled scan without filtering\n");
        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.\n", status);
                ret = -ENOENT;
        }

        return ret;
}

static void iwl_mvm_scan_fill_tx_cmd(struct iwl_mvm *mvm,
                                     struct iwl_scan_req_tx_cmd *tx_cmd,
                                     bool no_cck)
{
        tx_cmd[0].tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL |
                                         TX_CMD_FLG_BT_DIS);
        tx_cmd[0].rate_n_flags = iwl_mvm_scan_rate_n_flags(mvm,
                                                           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 = params->active_dwell;
        cmd->passive_dwell = params->passive_dwell;
        if (params->passive_fragmented)
                cmd->fragmented_dwell = params->fragmented_dwell;
        cmd->max_out_time = cpu_to_le32(params->max_out_time);
        cmd->suspend_time = cpu_to_le32(params->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,
                                        int n_iterations)
{
        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 &&
                (n_iterations > 1 ||
                 fw_has_api(capa, IWL_UCODE_TLV_API_SINGLE_SCAN_EBS)) &&
                vif->type != NL80211_IFTYPE_P2P_DEVICE);
}

static int iwl_mvm_scan_total_iterations(struct iwl_mvm_scan_params *params)
{
        return params->schedule[0].iterations + params->schedule[1].iterations;
}

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->passive_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 n_iterations = iwl_mvm_scan_total_iterations(params);

        lockdep_assert_held(&mvm->mutex);

        memset(cmd, 0, ksize(cmd));

        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;

        cmd->schedule[0].delay = cpu_to_le16(params->interval);
        cmd->schedule[0].iterations = params->schedule[0].iterations;
        cmd->schedule[0].full_scan_mul = params->schedule[0].full_scan_mul;
        cmd->schedule[1].delay = cpu_to_le16(params->interval);
        cmd->schedule[1].iterations = params->schedule[1].iterations;
        cmd->schedule[1].full_scan_mul = params->schedule[1].iterations;

        if (iwl_mvm_scan_use_ebs(mvm, vif, n_iterations)) {
                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\n");

        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 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 = params->active_dwell;
        cmd->passive_dwell = params->passive_dwell;
        if (params->passive_fragmented)
                cmd->fragmented_dwell = params->fragmented_dwell;
        cmd->max_out_time = cpu_to_le32(params->max_out_time);
        cmd->suspend_time = cpu_to_le32(params->suspend_time);
        cmd->scan_priority =
                iwl_mvm_scan_priority(mvm, IWL_SCAN_PRIORITY_EXT_6);

        if (iwl_mvm_scan_total_iterations(params) == 0)
                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->passive_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_scan_total_iterations(params) > 1)
                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;
        u32 ssid_bitmap = 0;
        int n_iterations = iwl_mvm_scan_total_iterations(params);

        lockdep_assert_held(&mvm->mutex);

        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, n_iterations))
                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);

        /* With UMAC we use only one schedule for now, so use the sum
         * of the iterations (with a a maximum of 255).
         */
        sec_part->schedule[0].iter_count =
                (n_iterations > 255) ? 255 : n_iterations;
        sec_part->schedule[0].interval = cpu_to_le16(params->interval);

        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;

        lockdep_assert_held(&mvm->mutex);

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

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

        iwl_mvm_ref(mvm, IWL_MVM_REF_SCAN);

        /* 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.interval = 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.schedule[0].iterations = 1;
        params.schedule[0].full_scan_mul = 0;
        params.schedule[1].iterations = 0;
        params.schedule[1].full_scan_mul = 0;

        iwl_mvm_scan_calc_dwell(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) {
                IWL_DEBUG_SCAN(mvm, "Scan request was sent successfully\n");
                mvm->scan_status |= IWL_MVM_SCAN_REGULAR;
        } 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, "Scan failed! ret %d\n", ret);
        }

        if (ret)
                iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);

        return ret;
}

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\n");
                return -EBUSY;
        }

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

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

        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;

        params.schedule[0].iterations = IWL_FAST_SCHED_SCAN_ITERATIONS;
        params.schedule[0].full_scan_mul = 1;
        params.schedule[1].iterations = 0xff;
        params.schedule[1].full_scan_mul = IWL_FULL_SCAN_MULTIPLIER;

        if (req->interval > U16_MAX) {
                IWL_DEBUG_SCAN(mvm,
                               "interval value is > 16-bits, set to max possible\n");
                params.interval = U16_MAX;
        } else {
                params.interval = req->interval / MSEC_PER_SEC;
        }

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

        iwl_mvm_scan_calc_dwell(mvm, vif, &params);

        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\n");
                mvm->scan_status |= type;
        } else {
                /* If the scan failed, it usually means that the FW was unable
                 * to allocate the time events. Warn on it, but maybe we
                 * should try to send the command again with different params.
                 */
                IWL_ERR(mvm, "Sched scan failed! ret %d\n", ret);
        }

        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\n",
                       uid, mvm->scan_uid_status[uid],
                       notif->status == IWL_SCAN_OFFLOAD_COMPLETED ?
                                "completed" : "aborted",
                       iwl_mvm_ebs_status_str(notif->ebs_status));

        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\n",
                       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\n", uid);

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

        return ret;
}

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

        lockdep_assert_held(&mvm->mutex);

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

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

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

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

        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\n",
                                      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;
}