drivers/net/wireless/iwlwifi/mvm/scan.c

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  65
  66 #include <linux/etherdevice.h>
  67 #include <net/mac80211.h>
  68
  69 #include "mvm.h"
  70 #include "fw-api-scan.h"
  71
  72 #define IWL_DENSE_EBS_SCAN_RATIO 5
  73 #define IWL_SPARSE_EBS_SCAN_RATIO 1
  74
  75 struct iwl_mvm_scan_params {
  76         u32 max_out_time;
  77         u32 suspend_time;
  78         bool passive_fragmented;
  79         u32 n_channels;
  80         u16 delay;
  81         int n_ssids;
  82         struct cfg80211_ssid *ssids;
  83         struct ieee80211_channel **channels;
  84         u16 interval; /* interval between scans (in secs) */
  85         u32 flags;
  86         u8 *mac_addr;
  87         u8 *mac_addr_mask;
  88         bool no_cck;
  89         bool pass_all;
  90         int n_match_sets;
  91         struct iwl_scan_probe_req preq;
  92         struct cfg80211_match_set *match_sets;
  93         u16 passive_dwell;
  94         u16 active_dwell;
  95         u16 fragmented_dwell;
  96         struct {
  97                 u8 iterations;
  98                 u8 full_scan_mul; /* not used for UMAC */
  99         } schedule[2];
 100 };
 101
 102 static u8 iwl_mvm_scan_rx_ant(struct iwl_mvm *mvm)
 103 {
 104         if (mvm->scan_rx_ant != ANT_NONE)
 105                 return mvm->scan_rx_ant;
 106         return iwl_mvm_get_valid_rx_ant(mvm);
 107 }
 108
 109 static inline __le16 iwl_mvm_scan_rx_chain(struct iwl_mvm *mvm)
 110 {
 111         u16 rx_chain;
 112         u8 rx_ant;
 113
 114         rx_ant = iwl_mvm_scan_rx_ant(mvm);
 115         rx_chain = rx_ant << PHY_RX_CHAIN_VALID_POS;
 116         rx_chain |= rx_ant << PHY_RX_CHAIN_FORCE_MIMO_SEL_POS;
 117         rx_chain |= rx_ant << PHY_RX_CHAIN_FORCE_SEL_POS;
 118         rx_chain |= 0x1 << PHY_RX_CHAIN_DRIVER_FORCE_POS;
 119         return cpu_to_le16(rx_chain);
 120 }
 121
 122 static __le32 iwl_mvm_scan_rxon_flags(enum ieee80211_band band)
 123 {
 124         if (band == IEEE80211_BAND_2GHZ)
 125                 return cpu_to_le32(PHY_BAND_24);
 126         else
 127                 return cpu_to_le32(PHY_BAND_5);
 128 }
 129
 130 static inline __le32
 131 iwl_mvm_scan_rate_n_flags(struct iwl_mvm *mvm, enum ieee80211_band band,
 132                           bool no_cck)
 133 {
 134         u32 tx_ant;
 135
 136         mvm->scan_last_antenna_idx =
 137                 iwl_mvm_next_antenna(mvm, iwl_mvm_get_valid_tx_ant(mvm),
 138                                      mvm->scan_last_antenna_idx);
 139         tx_ant = BIT(mvm->scan_last_antenna_idx) << RATE_MCS_ANT_POS;
 140
 141         if (band == IEEE80211_BAND_2GHZ && !no_cck)
 142                 return cpu_to_le32(IWL_RATE_1M_PLCP | RATE_MCS_CCK_MSK |
 143                                    tx_ant);
 144         else
 145                 return cpu_to_le32(IWL_RATE_6M_PLCP | tx_ant);
 146 }
 147
 148 static void iwl_mvm_scan_condition_iterator(void *data, u8 *mac,
 149                                             struct ieee80211_vif *vif)
 150 {
 151         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 152         int *global_cnt = data;
 153
 154         if (vif->type != NL80211_IFTYPE_P2P_DEVICE && mvmvif->phy_ctxt &&
 155             mvmvif->phy_ctxt->id < MAX_PHYS)
 156                 *global_cnt += 1;
 157 }
 158
 159 static void iwl_mvm_scan_calc_dwell(struct iwl_mvm *mvm,
 160                                     struct ieee80211_vif *vif,
 161                                     struct iwl_mvm_scan_params *params)
 162 {
 163         int global_cnt = 0;
 164         u8 frag_passive_dwell = 0;
 165
 166         ieee80211_iterate_active_interfaces_atomic(mvm->hw,
 167                                             IEEE80211_IFACE_ITER_NORMAL,
 168                                             iwl_mvm_scan_condition_iterator,
 169                                             &global_cnt);
 170         if (!global_cnt)
 171                 goto not_bound;
 172
 173         params->suspend_time = 30;
 174         params->max_out_time = 120;
 175
 176         if (iwl_mvm_low_latency(mvm)) {
 177                 if (fw_has_api(&mvm->fw->ucode_capa,
 178                                IWL_UCODE_TLV_API_FRAGMENTED_SCAN)) {
 179
 180                         params->suspend_time = 105;
 181                         /*
 182                          * If there is more than one active interface make
 183                          * passive scan more fragmented.
 184                          */
 185                         frag_passive_dwell = 40;
 186                         params->max_out_time = frag_passive_dwell;
 187                 } else {
 188                         params->suspend_time = 120;
 189                         params->max_out_time = 120;
 190                 }
 191         }
 192
 193         if (frag_passive_dwell &&
 194             fw_has_api(&mvm->fw->ucode_capa,
 195                        IWL_UCODE_TLV_API_FRAGMENTED_SCAN)) {
 196                 /*
 197                  * P2P device scan should not be fragmented to avoid negative
 198                  * impact on P2P device discovery. Configure max_out_time to be
 199                  * equal to dwell time on passive channel.
 200                  */
 201                 if (vif->type == NL80211_IFTYPE_P2P_DEVICE) {
 202                         params->max_out_time = 120;
 203                 } else {
 204                         params->passive_fragmented = true;
 205                 }
 206         }
 207
 208         if ((params->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) &&
 209             (params->max_out_time > 200))
 210                 params->max_out_time = 200;
 211
 212 not_bound:
 213
 214         if (params->passive_fragmented)
 215                 params->fragmented_dwell = frag_passive_dwell;
 216
 217         /*
 218          * use only basic dwell time in scan command, regardless of the band or
 219          * the number of the probes. FW will calculate the actual dwell time.
 220          */
 221         params->passive_dwell = 110;
 222         params->active_dwell = 10;
 223
 224
 225         IWL_DEBUG_SCAN(mvm,
 226                        "scan parameters: max_out_time %d, suspend_time %d, passive_fragmented %d\n",
 227                        params->max_out_time, params->suspend_time,
 228                        params->passive_fragmented);
 229 }
 230
 231 static inline bool iwl_mvm_rrm_scan_needed(struct iwl_mvm *mvm)
 232 {
 233         /* require rrm scan whenever the fw supports it */
 234         return fw_has_capa(&mvm->fw->ucode_capa,
 235                            IWL_UCODE_TLV_CAPA_DS_PARAM_SET_IE_SUPPORT);
 236 }
 237
 238 static int iwl_mvm_max_scan_ie_fw_cmd_room(struct iwl_mvm *mvm)
 239 {
 240         int max_probe_len;
 241
 242         max_probe_len = SCAN_OFFLOAD_PROBE_REQ_SIZE;
 243
 244         /* we create the 802.11 header and SSID element */
 245         max_probe_len -= 24 + 2;
 246
 247         /* DS parameter set element is added on 2.4GHZ band if required */
 248         if (iwl_mvm_rrm_scan_needed(mvm))
 249                 max_probe_len -= 3;
 250
 251         return max_probe_len;
 252 }
 253
 254 int iwl_mvm_max_scan_ie_len(struct iwl_mvm *mvm)
 255 {
 256         int max_ie_len = iwl_mvm_max_scan_ie_fw_cmd_room(mvm);
 257
 258         /* TODO: [BUG] This function should return the maximum allowed size of
 259          * scan IEs, however the LMAC scan api contains both 2GHZ and 5GHZ IEs
 260          * in the same command. So the correct implementation of this function
 261          * is just iwl_mvm_max_scan_ie_fw_cmd_room() / 2. Currently the scan
 262          * command has only 512 bytes and it would leave us with about 240
 263          * bytes for scan IEs, which is clearly not enough. So meanwhile
 264          * we will report an incorrect value. This may result in a failure to
 265          * issue a scan in unified_scan_lmac and unified_sched_scan_lmac
 266          * functions with -ENOBUFS, if a large enough probe will be provided.
 267          */
 268         return max_ie_len;
 269 }
 270
 271 static u8 *iwl_mvm_dump_channel_list(struct iwl_scan_results_notif *res,
 272                                      int num_res, u8 *buf, size_t buf_size)
 273 {
 274         int i;
 275         u8 *pos = buf, *end = buf + buf_size;
 276
 277         for (i = 0; pos < end && i < num_res; i++)
 278                 pos += snprintf(pos, end - pos, " %u", res[i].channel);
 279
 280         /* terminate the string in case the buffer was too short */
 281         *(buf + buf_size - 1) = '\0';
 282
 283         return buf;
 284 }
 285
 286 void iwl_mvm_rx_lmac_scan_iter_complete_notif(struct iwl_mvm *mvm,
 287                                               struct iwl_rx_cmd_buffer *rxb)
 288 {
 289         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 290         struct iwl_lmac_scan_complete_notif *notif = (void *)pkt->data;
 291         u8 buf[256];
 292
 293         IWL_DEBUG_SCAN(mvm,
 294                        "Scan offload iteration complete: status=0x%x scanned channels=%d channels list: %s\n",
 295                        notif->status, notif->scanned_channels,
 296                        iwl_mvm_dump_channel_list(notif->results,
 297                                                  notif->scanned_channels, buf,
 298                                                  sizeof(buf)));
 299 }
 300
 301 void iwl_mvm_rx_scan_match_found(struct iwl_mvm *mvm,
 302                                  struct iwl_rx_cmd_buffer *rxb)
 303 {
 304         IWL_DEBUG_SCAN(mvm, "Scheduled scan results\n");
 305         ieee80211_sched_scan_results(mvm->hw);
 306 }
 307
 308 static const char *iwl_mvm_ebs_status_str(enum iwl_scan_ebs_status status)
 309 {
 310         switch (status) {
 311         case IWL_SCAN_EBS_SUCCESS:
 312                 return "successful";
 313         case IWL_SCAN_EBS_INACTIVE:
 314                 return "inactive";
 315         case IWL_SCAN_EBS_FAILED:
 316         case IWL_SCAN_EBS_CHAN_NOT_FOUND:
 317         default:
 318                 return "failed";
 319         }
 320 }
 321
 322 void iwl_mvm_rx_lmac_scan_complete_notif(struct iwl_mvm *mvm,
 323                                          struct iwl_rx_cmd_buffer *rxb)
 324 {
 325         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 326         struct iwl_periodic_scan_complete *scan_notif = (void *)pkt->data;
 327         bool aborted = (scan_notif->status == IWL_SCAN_OFFLOAD_ABORTED);
 328
 329         /* scan status must be locked for proper checking */
 330         lockdep_assert_held(&mvm->mutex);
 331
 332         /* We first check if we were stopping a scan, in which case we
 333          * just clear the stopping flag.  Then we check if it was a
 334          * firmware initiated stop, in which case we need to inform
 335          * mac80211.
 336          * Note that we can have a stopping and a running scan
 337          * simultaneously, but we can't have two different types of
 338          * scans stopping or running at the same time (since LMAC
 339          * doesn't support it).
 340          */
 341
 342         if (mvm->scan_status & IWL_MVM_SCAN_STOPPING_SCHED) {
 343                 WARN_ON_ONCE(mvm->scan_status & IWL_MVM_SCAN_STOPPING_REGULAR);
 344
 345                 IWL_DEBUG_SCAN(mvm, "Scheduled scan %s, EBS status %s\n",
 346                                aborted ? "aborted" : "completed",
 347                                iwl_mvm_ebs_status_str(scan_notif->ebs_status));
 348
 349                 mvm->scan_status &= ~IWL_MVM_SCAN_STOPPING_SCHED;
 350         } else if (mvm->scan_status & IWL_MVM_SCAN_STOPPING_REGULAR) {
 351                 IWL_DEBUG_SCAN(mvm, "Regular scan %s, EBS status %s\n",
 352                                aborted ? "aborted" : "completed",
 353                                iwl_mvm_ebs_status_str(scan_notif->ebs_status));
 354
 355                 mvm->scan_status &= ~IWL_MVM_SCAN_STOPPING_REGULAR;
 356         } else if (mvm->scan_status & IWL_MVM_SCAN_SCHED) {
 357                 WARN_ON_ONCE(mvm->scan_status & IWL_MVM_SCAN_REGULAR);
 358
 359                 IWL_DEBUG_SCAN(mvm, "Scheduled scan %s, EBS status %s (FW)\n",
 360                                aborted ? "aborted" : "completed",
 361                                iwl_mvm_ebs_status_str(scan_notif->ebs_status));
 362
 363                 mvm->scan_status &= ~IWL_MVM_SCAN_SCHED;
 364                 ieee80211_sched_scan_stopped(mvm->hw);
 365         } else if (mvm->scan_status & IWL_MVM_SCAN_REGULAR) {
 366                 IWL_DEBUG_SCAN(mvm, "Regular scan %s, EBS status %s (FW)\n",
 367                                aborted ? "aborted" : "completed",
 368                                iwl_mvm_ebs_status_str(scan_notif->ebs_status));
 369
 370                 mvm->scan_status &= ~IWL_MVM_SCAN_REGULAR;
 371                 ieee80211_scan_completed(mvm->hw,
 372                                 scan_notif->status == IWL_SCAN_OFFLOAD_ABORTED);
 373                 iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
 374         }
 375
 376         mvm->last_ebs_successful =
 377                         scan_notif->ebs_status == IWL_SCAN_EBS_SUCCESS ||
 378                         scan_notif->ebs_status == IWL_SCAN_EBS_INACTIVE;
 379 }
 380
 381 static int iwl_ssid_exist(u8 *ssid, u8 ssid_len, struct iwl_ssid_ie *ssid_list)
 382 {
 383         int i;
 384
 385         for (i = 0; i < PROBE_OPTION_MAX; i++) {
 386                 if (!ssid_list[i].len)
 387                         break;
 388                 if (ssid_list[i].len == ssid_len &&
 389                     !memcmp(ssid_list->ssid, ssid, ssid_len))
 390                         return i;
 391         }
 392         return -1;
 393 }
 394
 395 /* We insert the SSIDs in an inverted order, because the FW will
 396  * invert it back.
 397  */
 398 static void iwl_scan_build_ssids(struct iwl_mvm_scan_params *params,
 399                                  struct iwl_ssid_ie *ssids,
 400                                  u32 *ssid_bitmap)
 401 {
 402         int i, j;
 403         int index;
 404
 405         /*
 406          * copy SSIDs from match list.
 407          * iwl_config_sched_scan_profiles() uses the order of these ssids to
 408          * config match list.
 409          */
 410         for (i = 0, j = params->n_match_sets - 1;
 411              j >= 0 && i < PROBE_OPTION_MAX;
 412              i++, j--) {
 413                 /* skip empty SSID matchsets */
 414                 if (!params->match_sets[j].ssid.ssid_len)
 415                         continue;
 416                 ssids[i].id = WLAN_EID_SSID;
 417                 ssids[i].len = params->match_sets[j].ssid.ssid_len;
 418                 memcpy(ssids[i].ssid, params->match_sets[j].ssid.ssid,
 419                        ssids[i].len);
 420         }
 421
 422         /* add SSIDs from scan SSID list */
 423         *ssid_bitmap = 0;
 424         for (j = params->n_ssids - 1;
 425              j >= 0 && i < PROBE_OPTION_MAX;
 426              i++, j--) {
 427                 index = iwl_ssid_exist(params->ssids[j].ssid,
 428                                        params->ssids[j].ssid_len,
 429                                        ssids);
 430                 if (index < 0) {
 431                         ssids[i].id = WLAN_EID_SSID;
 432                         ssids[i].len = params->ssids[j].ssid_len;
 433                         memcpy(ssids[i].ssid, params->ssids[j].ssid,
 434                                ssids[i].len);
 435                         *ssid_bitmap |= BIT(i);
 436                 } else {
 437                         *ssid_bitmap |= BIT(index);
 438                 }
 439         }
 440 }
 441
 442 static int
 443 iwl_mvm_config_sched_scan_profiles(struct iwl_mvm *mvm,
 444                                    struct cfg80211_sched_scan_request *req)
 445 {
 446         struct iwl_scan_offload_profile *profile;
 447         struct iwl_scan_offload_profile_cfg *profile_cfg;
 448         struct iwl_scan_offload_blacklist *blacklist;
 449         struct iwl_host_cmd cmd = {
 450                 .id = SCAN_OFFLOAD_UPDATE_PROFILES_CMD,
 451                 .len[1] = sizeof(*profile_cfg),
 452                 .dataflags[0] = IWL_HCMD_DFL_NOCOPY,
 453                 .dataflags[1] = IWL_HCMD_DFL_NOCOPY,
 454         };
 455         int blacklist_len;
 456         int i;
 457         int ret;
 458
 459         if (WARN_ON(req->n_match_sets > IWL_SCAN_MAX_PROFILES))
 460                         return -EIO;
 461
 462         if (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_SHORT_BL)
 463                 blacklist_len = IWL_SCAN_SHORT_BLACKLIST_LEN;
 464         else
 465                 blacklist_len = IWL_SCAN_MAX_BLACKLIST_LEN;
 466
 467         blacklist = kzalloc(sizeof(*blacklist) * blacklist_len, GFP_KERNEL);
 468         if (!blacklist)
 469                 return -ENOMEM;
 470
 471         profile_cfg = kzalloc(sizeof(*profile_cfg), GFP_KERNEL);
 472         if (!profile_cfg) {
 473                 ret = -ENOMEM;
 474                 goto free_blacklist;
 475         }
 476
 477         cmd.data[0] = blacklist;
 478         cmd.len[0] = sizeof(*blacklist) * blacklist_len;
 479         cmd.data[1] = profile_cfg;
 480
 481         /* No blacklist configuration */
 482
 483         profile_cfg->num_profiles = req->n_match_sets;
 484         profile_cfg->active_clients = SCAN_CLIENT_SCHED_SCAN;
 485         profile_cfg->pass_match = SCAN_CLIENT_SCHED_SCAN;
 486         profile_cfg->match_notify = SCAN_CLIENT_SCHED_SCAN;
 487         if (!req->n_match_sets || !req->match_sets[0].ssid.ssid_len)
 488                 profile_cfg->any_beacon_notify = SCAN_CLIENT_SCHED_SCAN;
 489
 490         for (i = 0; i < req->n_match_sets; i++) {
 491                 profile = &profile_cfg->profiles[i];
 492                 profile->ssid_index = i;
 493                 /* Support any cipher and auth algorithm */
 494                 profile->unicast_cipher = 0xff;
 495                 profile->auth_alg = 0xff;
 496                 profile->network_type = IWL_NETWORK_TYPE_ANY;
 497                 profile->band_selection = IWL_SCAN_OFFLOAD_SELECT_ANY;
 498                 profile->client_bitmap = SCAN_CLIENT_SCHED_SCAN;
 499         }
 500
 501         IWL_DEBUG_SCAN(mvm, "Sending scheduled scan profile config\n");
 502
 503         ret = iwl_mvm_send_cmd(mvm, &cmd);
 504         kfree(profile_cfg);
 505 free_blacklist:
 506         kfree(blacklist);
 507
 508         return ret;
 509 }
 510
 511 static bool iwl_mvm_scan_pass_all(struct iwl_mvm *mvm,
 512                                   struct cfg80211_sched_scan_request *req)
 513 {
 514         if (req->n_match_sets && req->match_sets[0].ssid.ssid_len) {
 515                 IWL_DEBUG_SCAN(mvm,
 516                                "Sending scheduled scan with filtering, n_match_sets %d\n",
 517                                req->n_match_sets);
 518                 return false;
 519         }
 520
 521         IWL_DEBUG_SCAN(mvm, "Sending Scheduled scan without filtering\n");
 522         return true;
 523 }
 524
 525 static int iwl_mvm_lmac_scan_abort(struct iwl_mvm *mvm)
 526 {
 527         int ret;
 528         struct iwl_host_cmd cmd = {
 529                 .id = SCAN_OFFLOAD_ABORT_CMD,
 530         };
 531         u32 status;
 532
 533         ret = iwl_mvm_send_cmd_status(mvm, &cmd, &status);
 534         if (ret)
 535                 return ret;
 536
 537         if (status != CAN_ABORT_STATUS) {
 538                 /*
 539                  * The scan abort will return 1 for success or
 540                  * 2 for "failure".  A failure condition can be
 541                  * due to simply not being in an active scan which
 542                  * can occur if we send the scan abort before the
 543                  * microcode has notified us that a scan is completed.
 544                  */
 545                 IWL_DEBUG_SCAN(mvm, "SCAN OFFLOAD ABORT ret %d.\n", status);
 546                 ret = -ENOENT;
 547         }
 548
 549         return ret;
 550 }
 551
 552 static void iwl_mvm_scan_fill_tx_cmd(struct iwl_mvm *mvm,
 553                                      struct iwl_scan_req_tx_cmd *tx_cmd,
 554                                      bool no_cck)
 555 {
 556         tx_cmd[0].tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL |
 557                                          TX_CMD_FLG_BT_DIS);
 558         tx_cmd[0].rate_n_flags = iwl_mvm_scan_rate_n_flags(mvm,
 559                                                            IEEE80211_BAND_2GHZ,
 560                                                            no_cck);
 561         tx_cmd[0].sta_id = mvm->aux_sta.sta_id;
 562
 563         tx_cmd[1].tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL |
 564                                          TX_CMD_FLG_BT_DIS);
 565         tx_cmd[1].rate_n_flags = iwl_mvm_scan_rate_n_flags(mvm,
 566                                                            IEEE80211_BAND_5GHZ,
 567                                                            no_cck);
 568         tx_cmd[1].sta_id = mvm->aux_sta.sta_id;
 569 }
 570
 571 static void
 572 iwl_mvm_lmac_scan_cfg_channels(struct iwl_mvm *mvm,
 573                                struct ieee80211_channel **channels,
 574                                int n_channels, u32 ssid_bitmap,
 575                                struct iwl_scan_req_lmac *cmd)
 576 {
 577         struct iwl_scan_channel_cfg_lmac *channel_cfg = (void *)&cmd->data;
 578         int i;
 579
 580         for (i = 0; i < n_channels; i++) {
 581                 channel_cfg[i].channel_num =
 582                         cpu_to_le16(channels[i]->hw_value);
 583                 channel_cfg[i].iter_count = cpu_to_le16(1);
 584                 channel_cfg[i].iter_interval = 0;
 585                 channel_cfg[i].flags =
 586                         cpu_to_le32(IWL_UNIFIED_SCAN_CHANNEL_PARTIAL |
 587                                     ssid_bitmap);
 588         }
 589 }
 590
 591 static u8 *iwl_mvm_copy_and_insert_ds_elem(struct iwl_mvm *mvm, const u8 *ies,
 592                                            size_t len, u8 *const pos)
 593 {
 594         static const u8 before_ds_params[] = {
 595                         WLAN_EID_SSID,
 596                         WLAN_EID_SUPP_RATES,
 597                         WLAN_EID_REQUEST,
 598                         WLAN_EID_EXT_SUPP_RATES,
 599         };
 600         size_t offs;
 601         u8 *newpos = pos;
 602
 603         if (!iwl_mvm_rrm_scan_needed(mvm)) {
 604                 memcpy(newpos, ies, len);
 605                 return newpos + len;
 606         }
 607
 608         offs = ieee80211_ie_split(ies, len,
 609                                   before_ds_params,
 610                                   ARRAY_SIZE(before_ds_params),
 611                                   0);
 612
 613         memcpy(newpos, ies, offs);
 614         newpos += offs;
 615
 616         /* Add a placeholder for DS Parameter Set element */
 617         *newpos++ = WLAN_EID_DS_PARAMS;
 618         *newpos++ = 1;
 619         *newpos++ = 0;
 620
 621         memcpy(newpos, ies + offs, len - offs);
 622         newpos += len - offs;
 623
 624         return newpos;
 625 }
 626
 627 static void
 628 iwl_mvm_build_scan_probe(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 629                          struct ieee80211_scan_ies *ies,
 630                          struct iwl_mvm_scan_params *params)
 631 {
 632         struct ieee80211_mgmt *frame = (void *)params->preq.buf;
 633         u8 *pos, *newpos;
 634         const u8 *mac_addr = params->flags & NL80211_SCAN_FLAG_RANDOM_ADDR ?
 635                 params->mac_addr : NULL;
 636
 637         /*
 638          * Unfortunately, right now the offload scan doesn't support randomising
 639          * within the firmware, so until the firmware API is ready we implement
 640          * it in the driver. This means that the scan iterations won't really be
 641          * random, only when it's restarted, but at least that helps a bit.
 642          */
 643         if (mac_addr)
 644                 get_random_mask_addr(frame->sa, mac_addr,
 645                                      params->mac_addr_mask);
 646         else
 647                 memcpy(frame->sa, vif->addr, ETH_ALEN);
 648
 649         frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
 650         eth_broadcast_addr(frame->da);
 651         eth_broadcast_addr(frame->bssid);
 652         frame->seq_ctrl = 0;
 653
 654         pos = frame->u.probe_req.variable;
 655         *pos++ = WLAN_EID_SSID;
 656         *pos++ = 0;
 657
 658         params->preq.mac_header.offset = 0;
 659         params->preq.mac_header.len = cpu_to_le16(24 + 2);
 660
 661         /* Insert ds parameter set element on 2.4 GHz band */
 662         newpos = iwl_mvm_copy_and_insert_ds_elem(mvm,
 663                                                  ies->ies[IEEE80211_BAND_2GHZ],
 664                                                  ies->len[IEEE80211_BAND_2GHZ],
 665                                                  pos);
 666         params->preq.band_data[0].offset = cpu_to_le16(pos - params->preq.buf);
 667         params->preq.band_data[0].len = cpu_to_le16(newpos - pos);
 668         pos = newpos;
 669
 670         memcpy(pos, ies->ies[IEEE80211_BAND_5GHZ],
 671                ies->len[IEEE80211_BAND_5GHZ]);
 672         params->preq.band_data[1].offset = cpu_to_le16(pos - params->preq.buf);
 673         params->preq.band_data[1].len =
 674                 cpu_to_le16(ies->len[IEEE80211_BAND_5GHZ]);
 675         pos += ies->len[IEEE80211_BAND_5GHZ];
 676
 677         memcpy(pos, ies->common_ies, ies->common_ie_len);
 678         params->preq.common_data.offset = cpu_to_le16(pos - params->preq.buf);
 679         params->preq.common_data.len = cpu_to_le16(ies->common_ie_len);
 680 }
 681
 682 static __le32 iwl_mvm_scan_priority(struct iwl_mvm *mvm,
 683                                     enum iwl_scan_priority_ext prio)
 684 {
 685         if (fw_has_api(&mvm->fw->ucode_capa,
 686                        IWL_UCODE_TLV_API_EXT_SCAN_PRIORITY))
 687                 return cpu_to_le32(prio);
 688
 689         if (prio <= IWL_SCAN_PRIORITY_EXT_2)
 690                 return cpu_to_le32(IWL_SCAN_PRIORITY_LOW);
 691
 692         if (prio <= IWL_SCAN_PRIORITY_EXT_4)
 693                 return cpu_to_le32(IWL_SCAN_PRIORITY_MEDIUM);
 694
 695         return cpu_to_le32(IWL_SCAN_PRIORITY_HIGH);
 696 }
 697
 698 static void iwl_mvm_scan_lmac_dwell(struct iwl_mvm *mvm,
 699                                     struct iwl_scan_req_lmac *cmd,
 700                                     struct iwl_mvm_scan_params *params)
 701 {
 702         cmd->active_dwell = params->active_dwell;
 703         cmd->passive_dwell = params->passive_dwell;
 704         if (params->passive_fragmented)
 705                 cmd->fragmented_dwell = params->fragmented_dwell;
 706         cmd->max_out_time = cpu_to_le32(params->max_out_time);
 707         cmd->suspend_time = cpu_to_le32(params->suspend_time);
 708         cmd->scan_prio = iwl_mvm_scan_priority(mvm, IWL_SCAN_PRIORITY_EXT_6);
 709 }
 710
 711 static inline bool iwl_mvm_scan_fits(struct iwl_mvm *mvm, int n_ssids,
 712                                      struct ieee80211_scan_ies *ies,
 713                                      int n_channels)
 714 {
 715         return ((n_ssids <= PROBE_OPTION_MAX) &&
 716                 (n_channels <= mvm->fw->ucode_capa.n_scan_channels) &
 717                 (ies->common_ie_len +
 718                  ies->len[NL80211_BAND_2GHZ] +
 719                  ies->len[NL80211_BAND_5GHZ] <=
 720                  iwl_mvm_max_scan_ie_fw_cmd_room(mvm)));
 721 }
 722
 723 static inline bool iwl_mvm_scan_use_ebs(struct iwl_mvm *mvm,
 724                                         struct ieee80211_vif *vif,
 725                                         int n_iterations)
 726 {
 727         const struct iwl_ucode_capabilities *capa = &mvm->fw->ucode_capa;
 728
 729         /* We can only use EBS if:
 730          *      1. the feature is supported;
 731          *      2. the last EBS was successful;
 732          *      3. if only single scan, the single scan EBS API is supported;
 733          *      4. it's not a p2p find operation.
 734          */
 735         return ((capa->flags & IWL_UCODE_TLV_FLAGS_EBS_SUPPORT) &&
 736                 mvm->last_ebs_successful &&
 737                 (n_iterations > 1 ||
 738                  fw_has_api(capa, IWL_UCODE_TLV_API_SINGLE_SCAN_EBS)) &&
 739                 vif->type != NL80211_IFTYPE_P2P_DEVICE);
 740 }
 741
 742 static int iwl_mvm_scan_total_iterations(struct iwl_mvm_scan_params *params)
 743 {
 744         return params->schedule[0].iterations + params->schedule[1].iterations;
 745 }
 746
 747 static int iwl_mvm_scan_lmac_flags(struct iwl_mvm *mvm,
 748                                    struct iwl_mvm_scan_params *params)
 749 {
 750         int flags = 0;
 751
 752         if (params->n_ssids == 0)
 753                 flags |= IWL_MVM_LMAC_SCAN_FLAG_PASSIVE;
 754
 755         if (params->n_ssids == 1 && params->ssids[0].ssid_len != 0)
 756                 flags |= IWL_MVM_LMAC_SCAN_FLAG_PRE_CONNECTION;
 757
 758         if (params->passive_fragmented)
 759                 flags |= IWL_MVM_LMAC_SCAN_FLAG_FRAGMENTED;
 760
 761         if (iwl_mvm_rrm_scan_needed(mvm))
 762                 flags |= IWL_MVM_LMAC_SCAN_FLAGS_RRM_ENABLED;
 763
 764         if (params->pass_all)
 765                 flags |= IWL_MVM_LMAC_SCAN_FLAG_PASS_ALL;
 766         else
 767                 flags |= IWL_MVM_LMAC_SCAN_FLAG_MATCH;
 768
 769 #ifdef CONFIG_IWLWIFI_DEBUGFS
 770         if (mvm->scan_iter_notif_enabled)
 771                 flags |= IWL_MVM_LMAC_SCAN_FLAG_ITER_COMPLETE;
 772 #endif
 773
 774         return flags;
 775 }
 776
 777 static int iwl_mvm_scan_lmac(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 778                              struct iwl_mvm_scan_params *params)
 779 {
 780         struct iwl_scan_req_lmac *cmd = mvm->scan_cmd;
 781         struct iwl_scan_probe_req *preq =
 782                 (void *)(cmd->data + sizeof(struct iwl_scan_channel_cfg_lmac) *
 783                          mvm->fw->ucode_capa.n_scan_channels);
 784         u32 ssid_bitmap = 0;
 785         int n_iterations = iwl_mvm_scan_total_iterations(params);
 786
 787         lockdep_assert_held(&mvm->mutex);
 788
 789         memset(cmd, 0, ksize(cmd));
 790
 791         iwl_mvm_scan_lmac_dwell(mvm, cmd, params);
 792
 793         cmd->rx_chain_select = iwl_mvm_scan_rx_chain(mvm);
 794         cmd->iter_num = cpu_to_le32(1);
 795         cmd->n_channels = (u8)params->n_channels;
 796
 797         cmd->delay = cpu_to_le32(params->delay);
 798
 799         cmd->scan_flags = cpu_to_le32(iwl_mvm_scan_lmac_flags(mvm, params));
 800
 801         cmd->flags = iwl_mvm_scan_rxon_flags(params->channels[0]->band);
 802         cmd->filter_flags = cpu_to_le32(MAC_FILTER_ACCEPT_GRP |
 803                                         MAC_FILTER_IN_BEACON);
 804         iwl_mvm_scan_fill_tx_cmd(mvm, cmd->tx_cmd, params->no_cck);
 805         iwl_scan_build_ssids(params, cmd->direct_scan, &ssid_bitmap);
 806
 807         /* this API uses bits 1-20 instead of 0-19 */
 808         ssid_bitmap <<= 1;
 809
 810         cmd->schedule[0].delay = cpu_to_le16(params->interval);
 811         cmd->schedule[0].iterations = params->schedule[0].iterations;
 812         cmd->schedule[0].full_scan_mul = params->schedule[0].full_scan_mul;
 813         cmd->schedule[1].delay = cpu_to_le16(params->interval);
 814         cmd->schedule[1].iterations = params->schedule[1].iterations;
 815         cmd->schedule[1].full_scan_mul = params->schedule[1].iterations;
 816
 817         if (iwl_mvm_scan_use_ebs(mvm, vif, n_iterations)) {
 818                 cmd->channel_opt[0].flags =
 819                         cpu_to_le16(IWL_SCAN_CHANNEL_FLAG_EBS |
 820                                     IWL_SCAN_CHANNEL_FLAG_EBS_ACCURATE |
 821                                     IWL_SCAN_CHANNEL_FLAG_CACHE_ADD);
 822                 cmd->channel_opt[0].non_ebs_ratio =
 823                         cpu_to_le16(IWL_DENSE_EBS_SCAN_RATIO);
 824                 cmd->channel_opt[1].flags =
 825                         cpu_to_le16(IWL_SCAN_CHANNEL_FLAG_EBS |
 826                                     IWL_SCAN_CHANNEL_FLAG_EBS_ACCURATE |
 827                                     IWL_SCAN_CHANNEL_FLAG_CACHE_ADD);
 828                 cmd->channel_opt[1].non_ebs_ratio =
 829                         cpu_to_le16(IWL_SPARSE_EBS_SCAN_RATIO);
 830         }
 831
 832         iwl_mvm_lmac_scan_cfg_channels(mvm, params->channels,
 833                                        params->n_channels, ssid_bitmap, cmd);
 834
 835         *preq = params->preq;
 836
 837         return 0;
 838 }
 839
 840 static int rate_to_scan_rate_flag(unsigned int rate)
 841 {
 842         static const int rate_to_scan_rate[IWL_RATE_COUNT] = {
 843                 [IWL_RATE_1M_INDEX]     = SCAN_CONFIG_RATE_1M,
 844                 [IWL_RATE_2M_INDEX]     = SCAN_CONFIG_RATE_2M,
 845                 [IWL_RATE_5M_INDEX]     = SCAN_CONFIG_RATE_5M,
 846                 [IWL_RATE_11M_INDEX]    = SCAN_CONFIG_RATE_11M,
 847                 [IWL_RATE_6M_INDEX]     = SCAN_CONFIG_RATE_6M,
 848                 [IWL_RATE_9M_INDEX]     = SCAN_CONFIG_RATE_9M,
 849                 [IWL_RATE_12M_INDEX]    = SCAN_CONFIG_RATE_12M,
 850                 [IWL_RATE_18M_INDEX]    = SCAN_CONFIG_RATE_18M,
 851                 [IWL_RATE_24M_INDEX]    = SCAN_CONFIG_RATE_24M,
 852                 [IWL_RATE_36M_INDEX]    = SCAN_CONFIG_RATE_36M,
 853                 [IWL_RATE_48M_INDEX]    = SCAN_CONFIG_RATE_48M,
 854                 [IWL_RATE_54M_INDEX]    = SCAN_CONFIG_RATE_54M,
 855         };
 856
 857         return rate_to_scan_rate[rate];
 858 }
 859
 860 static __le32 iwl_mvm_scan_config_rates(struct iwl_mvm *mvm)
 861 {
 862         struct ieee80211_supported_band *band;
 863         unsigned int rates = 0;
 864         int i;
 865
 866         band = &mvm->nvm_data->bands[IEEE80211_BAND_2GHZ];
 867         for (i = 0; i < band->n_bitrates; i++)
 868                 rates |= rate_to_scan_rate_flag(band->bitrates[i].hw_value);
 869         band = &mvm->nvm_data->bands[IEEE80211_BAND_5GHZ];
 870         for (i = 0; i < band->n_bitrates; i++)
 871                 rates |= rate_to_scan_rate_flag(band->bitrates[i].hw_value);
 872
 873         /* Set both basic rates and supported rates */
 874         rates |= SCAN_CONFIG_SUPPORTED_RATE(rates);
 875
 876         return cpu_to_le32(rates);
 877 }
 878
 879 int iwl_mvm_config_scan(struct iwl_mvm *mvm)
 880 {
 881
 882         struct iwl_scan_config *scan_config;
 883         struct ieee80211_supported_band *band;
 884         int num_channels =
 885                 mvm->nvm_data->bands[IEEE80211_BAND_2GHZ].n_channels +
 886                 mvm->nvm_data->bands[IEEE80211_BAND_5GHZ].n_channels;
 887         int ret, i, j = 0, cmd_size;
 888         struct iwl_host_cmd cmd = {
 889                 .id = iwl_cmd_id(SCAN_CFG_CMD, IWL_ALWAYS_LONG_GROUP, 0),
 890         };
 891
 892         if (WARN_ON(num_channels > mvm->fw->ucode_capa.n_scan_channels))
 893                 return -ENOBUFS;
 894
 895         cmd_size = sizeof(*scan_config) + mvm->fw->ucode_capa.n_scan_channels;
 896
 897         scan_config = kzalloc(cmd_size, GFP_KERNEL);
 898         if (!scan_config)
 899                 return -ENOMEM;
 900
 901         scan_config->flags = cpu_to_le32(SCAN_CONFIG_FLAG_ACTIVATE |
 902                                          SCAN_CONFIG_FLAG_ALLOW_CHUB_REQS |
 903                                          SCAN_CONFIG_FLAG_SET_TX_CHAINS |
 904                                          SCAN_CONFIG_FLAG_SET_RX_CHAINS |
 905                                          SCAN_CONFIG_FLAG_SET_ALL_TIMES |
 906                                          SCAN_CONFIG_FLAG_SET_LEGACY_RATES |
 907                                          SCAN_CONFIG_FLAG_SET_MAC_ADDR |
 908                                          SCAN_CONFIG_FLAG_SET_CHANNEL_FLAGS|
 909                                          SCAN_CONFIG_N_CHANNELS(num_channels));
 910         scan_config->tx_chains = cpu_to_le32(iwl_mvm_get_valid_tx_ant(mvm));
 911         scan_config->rx_chains = cpu_to_le32(iwl_mvm_scan_rx_ant(mvm));
 912         scan_config->legacy_rates = iwl_mvm_scan_config_rates(mvm);
 913         scan_config->out_of_channel_time = cpu_to_le32(170);
 914         scan_config->suspend_time = cpu_to_le32(30);
 915         scan_config->dwell_active = 20;
 916         scan_config->dwell_passive = 110;
 917         scan_config->dwell_fragmented = 20;
 918
 919         memcpy(&scan_config->mac_addr, &mvm->addresses[0].addr, ETH_ALEN);
 920
 921         scan_config->bcast_sta_id = mvm->aux_sta.sta_id;
 922         scan_config->channel_flags = IWL_CHANNEL_FLAG_EBS |
 923                                      IWL_CHANNEL_FLAG_ACCURATE_EBS |
 924                                      IWL_CHANNEL_FLAG_EBS_ADD |
 925                                      IWL_CHANNEL_FLAG_PRE_SCAN_PASSIVE2ACTIVE;
 926
 927         band = &mvm->nvm_data->bands[IEEE80211_BAND_2GHZ];
 928         for (i = 0; i < band->n_channels; i++, j++)
 929                 scan_config->channel_array[j] = band->channels[i].hw_value;
 930         band = &mvm->nvm_data->bands[IEEE80211_BAND_5GHZ];
 931         for (i = 0; i < band->n_channels; i++, j++)
 932                 scan_config->channel_array[j] = band->channels[i].hw_value;
 933
 934         cmd.data[0] = scan_config;
 935         cmd.len[0] = cmd_size;
 936         cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
 937
 938         IWL_DEBUG_SCAN(mvm, "Sending UMAC scan config\n");
 939
 940         ret = iwl_mvm_send_cmd(mvm, &cmd);
 941
 942         kfree(scan_config);
 943         return ret;
 944 }
 945
 946 static int iwl_mvm_scan_uid_by_status(struct iwl_mvm *mvm, int status)
 947 {
 948         int i;
 949
 950         for (i = 0; i < mvm->max_scans; i++)
 951                 if (mvm->scan_uid_status[i] == status)
 952                         return i;
 953
 954         return -ENOENT;
 955 }
 956
 957 static void iwl_mvm_scan_umac_dwell(struct iwl_mvm *mvm,
 958                                     struct iwl_scan_req_umac *cmd,
 959                                     struct iwl_mvm_scan_params *params)
 960 {
 961         cmd->active_dwell = params->active_dwell;
 962         cmd->passive_dwell = params->passive_dwell;
 963         if (params->passive_fragmented)
 964                 cmd->fragmented_dwell = params->fragmented_dwell;
 965         cmd->max_out_time = cpu_to_le32(params->max_out_time);
 966         cmd->suspend_time = cpu_to_le32(params->suspend_time);
 967         cmd->scan_priority =
 968                 iwl_mvm_scan_priority(mvm, IWL_SCAN_PRIORITY_EXT_6);
 969
 970         if (iwl_mvm_scan_total_iterations(params) == 0)
 971                 cmd->ooc_priority =
 972                         iwl_mvm_scan_priority(mvm, IWL_SCAN_PRIORITY_EXT_6);
 973         else
 974                 cmd->ooc_priority =
 975                         iwl_mvm_scan_priority(mvm, IWL_SCAN_PRIORITY_EXT_2);
 976 }
 977
 978 static void
 979 iwl_mvm_umac_scan_cfg_channels(struct iwl_mvm *mvm,
 980                                struct ieee80211_channel **channels,
 981                                int n_channels, u32 ssid_bitmap,
 982                                struct iwl_scan_req_umac *cmd)
 983 {
 984         struct iwl_scan_channel_cfg_umac *channel_cfg = (void *)&cmd->data;
 985         int i;
 986
 987         for (i = 0; i < n_channels; i++) {
 988                 channel_cfg[i].flags = cpu_to_le32(ssid_bitmap);
 989                 channel_cfg[i].channel_num = channels[i]->hw_value;
 990                 channel_cfg[i].iter_count = 1;
 991                 channel_cfg[i].iter_interval = 0;
 992         }
 993 }
 994
 995 static u32 iwl_mvm_scan_umac_flags(struct iwl_mvm *mvm,
 996                                    struct iwl_mvm_scan_params *params)
 997 {
 998         int flags = 0;
 999
1000         if (params->n_ssids == 0)
1001                 flags = IWL_UMAC_SCAN_GEN_FLAGS_PASSIVE;
1002
1003         if (params->n_ssids == 1 && params->ssids[0].ssid_len != 0)
1004                 flags |= IWL_UMAC_SCAN_GEN_FLAGS_PRE_CONNECT;
1005
1006         if (params->passive_fragmented)
1007                 flags |= IWL_UMAC_SCAN_GEN_FLAGS_FRAGMENTED;
1008
1009         if (iwl_mvm_rrm_scan_needed(mvm))
1010                 flags |= IWL_UMAC_SCAN_GEN_FLAGS_RRM_ENABLED;
1011
1012         if (params->pass_all)
1013                 flags |= IWL_UMAC_SCAN_GEN_FLAGS_PASS_ALL;
1014         else
1015                 flags |= IWL_UMAC_SCAN_GEN_FLAGS_MATCH;
1016
1017         if (iwl_mvm_scan_total_iterations(params) > 1)
1018                 flags |= IWL_UMAC_SCAN_GEN_FLAGS_PERIODIC;
1019
1020 #ifdef CONFIG_IWLWIFI_DEBUGFS
1021         if (mvm->scan_iter_notif_enabled)
1022                 flags |= IWL_UMAC_SCAN_GEN_FLAGS_ITER_COMPLETE;
1023 #endif
1024         return flags;
1025 }
1026
1027 static int iwl_mvm_scan_umac(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1028                              struct iwl_mvm_scan_params *params,
1029                              int type)
1030 {
1031         struct iwl_scan_req_umac *cmd = mvm->scan_cmd;
1032         struct iwl_scan_req_umac_tail *sec_part = (void *)&cmd->data +
1033                 sizeof(struct iwl_scan_channel_cfg_umac) *
1034                         mvm->fw->ucode_capa.n_scan_channels;
1035         int uid;
1036         u32 ssid_bitmap = 0;
1037         int n_iterations = iwl_mvm_scan_total_iterations(params);
1038
1039         lockdep_assert_held(&mvm->mutex);
1040
1041         uid = iwl_mvm_scan_uid_by_status(mvm, 0);
1042         if (uid < 0)
1043                 return uid;
1044
1045         memset(cmd, 0, ksize(cmd));
1046
1047         iwl_mvm_scan_umac_dwell(mvm, cmd, params);
1048
1049         mvm->scan_uid_status[uid] = type;
1050
1051         cmd->uid = cpu_to_le32(uid);
1052         cmd->general_flags = cpu_to_le32(iwl_mvm_scan_umac_flags(mvm, params));
1053
1054         if (type == IWL_MVM_SCAN_SCHED)
1055                 cmd->flags = cpu_to_le32(IWL_UMAC_SCAN_FLAG_PREEMPTIVE);
1056
1057         if (iwl_mvm_scan_use_ebs(mvm, vif, n_iterations))
1058                 cmd->channel_flags = IWL_SCAN_CHANNEL_FLAG_EBS |
1059                                      IWL_SCAN_CHANNEL_FLAG_EBS_ACCURATE |
1060                                      IWL_SCAN_CHANNEL_FLAG_CACHE_ADD;
1061
1062         cmd->n_channels = params->n_channels;
1063
1064         iwl_scan_build_ssids(params, sec_part->direct_scan, &ssid_bitmap);
1065
1066         iwl_mvm_umac_scan_cfg_channels(mvm, params->channels,
1067                                        params->n_channels, ssid_bitmap, cmd);
1068
1069         /* With UMAC we use only one schedule for now, so use the sum
1070          * of the iterations (with a a maximum of 255).
1071          */
1072         sec_part->schedule[0].iter_count =
1073                 (n_iterations > 255) ? 255 : n_iterations;
1074         sec_part->schedule[0].interval = cpu_to_le16(params->interval);
1075
1076         sec_part->delay = cpu_to_le16(params->delay);
1077         sec_part->preq = params->preq;
1078
1079         return 0;
1080 }
1081
1082 static int iwl_mvm_num_scans(struct iwl_mvm *mvm)
1083 {
1084         return hweight32(mvm->scan_status & IWL_MVM_SCAN_MASK);
1085 }
1086
1087 static int iwl_mvm_check_running_scans(struct iwl_mvm *mvm, int type)
1088 {
1089         /* This looks a bit arbitrary, but the idea is that if we run
1090          * out of possible simultaneous scans and the userspace is
1091          * trying to run a scan type that is already running, we
1092          * return -EBUSY.  But if the userspace wants to start a
1093          * different type of scan, we stop the opposite type to make
1094          * space for the new request.  The reason is backwards
1095          * compatibility with old wpa_supplicant that wouldn't stop a
1096          * scheduled scan before starting a normal scan.
1097          */
1098
1099         if (iwl_mvm_num_scans(mvm) < mvm->max_scans)
1100                 return 0;
1101
1102         /* Use a switch, even though this is a bitmask, so that more
1103          * than one bits set will fall in default and we will warn.
1104          */
1105         switch (type) {
1106         case IWL_MVM_SCAN_REGULAR:
1107                 if (mvm->scan_status & IWL_MVM_SCAN_REGULAR_MASK)
1108                         return -EBUSY;
1109                 return iwl_mvm_scan_stop(mvm, IWL_MVM_SCAN_SCHED, true);
1110         case IWL_MVM_SCAN_SCHED:
1111                 if (mvm->scan_status & IWL_MVM_SCAN_SCHED_MASK)
1112                         return -EBUSY;
1113                 iwl_mvm_scan_stop(mvm, IWL_MVM_SCAN_REGULAR, true);
1114         case IWL_MVM_SCAN_NETDETECT:
1115                 /* No need to stop anything for net-detect since the
1116                  * firmware is restarted anyway.  This way, any sched
1117                  * scans that were running will be restarted when we
1118                  * resume.
1119                 */
1120                 return 0;
1121         default:
1122                 WARN_ON(1);
1123                 break;
1124         }
1125
1126         return -EIO;
1127 }
1128
1129 int iwl_mvm_reg_scan_start(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1130                            struct cfg80211_scan_request *req,
1131                            struct ieee80211_scan_ies *ies)
1132 {
1133         struct iwl_host_cmd hcmd = {
1134                 .len = { iwl_mvm_scan_size(mvm), },
1135                 .data = { mvm->scan_cmd, },
1136                 .dataflags = { IWL_HCMD_DFL_NOCOPY, },
1137         };
1138         struct iwl_mvm_scan_params params = {};
1139         int ret;
1140
1141         lockdep_assert_held(&mvm->mutex);
1142
1143         if (iwl_mvm_is_lar_supported(mvm) && !mvm->lar_regdom_set) {
1144                 IWL_ERR(mvm, "scan while LAR regdomain is not set\n");
1145                 return -EBUSY;
1146         }
1147
1148         ret = iwl_mvm_check_running_scans(mvm, IWL_MVM_SCAN_REGULAR);
1149         if (ret)
1150                 return ret;
1151
1152         iwl_mvm_ref(mvm, IWL_MVM_REF_SCAN);
1153
1154         /* we should have failed registration if scan_cmd was NULL */
1155         if (WARN_ON(!mvm->scan_cmd))
1156                 return -ENOMEM;
1157
1158         if (!iwl_mvm_scan_fits(mvm, req->n_ssids, ies, req->n_channels))
1159                 return -ENOBUFS;
1160
1161         params.n_ssids = req->n_ssids;
1162         params.flags = req->flags;
1163         params.n_channels = req->n_channels;
1164         params.delay = 0;
1165         params.interval = 0;
1166         params.ssids = req->ssids;
1167         params.channels = req->channels;
1168         params.mac_addr = req->mac_addr;
1169         params.mac_addr_mask = req->mac_addr_mask;
1170         params.no_cck = req->no_cck;
1171         params.pass_all = true;
1172         params.n_match_sets = 0;
1173         params.match_sets = NULL;
1174
1175         params.schedule[0].iterations = 1;
1176         params.schedule[0].full_scan_mul = 0;
1177         params.schedule[1].iterations = 0;
1178         params.schedule[1].full_scan_mul = 0;
1179
1180         iwl_mvm_scan_calc_dwell(mvm, vif, &params);
1181
1182         iwl_mvm_build_scan_probe(mvm, vif, ies, &params);
1183
1184         if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_UMAC_SCAN)) {
1185                 hcmd.id = iwl_cmd_id(SCAN_REQ_UMAC, IWL_ALWAYS_LONG_GROUP, 0);
1186                 ret = iwl_mvm_scan_umac(mvm, vif, &params,
1187                                         IWL_MVM_SCAN_REGULAR);
1188         } else {
1189                 hcmd.id = SCAN_OFFLOAD_REQUEST_CMD;
1190                 ret = iwl_mvm_scan_lmac(mvm, vif, &params);
1191         }
1192
1193         if (ret)
1194                 return ret;
1195
1196         ret = iwl_mvm_send_cmd(mvm, &hcmd);
1197         if (!ret) {
1198                 IWL_DEBUG_SCAN(mvm, "Scan request was sent successfully\n");
1199                 mvm->scan_status |= IWL_MVM_SCAN_REGULAR;
1200         } else {
1201                 /* If the scan failed, it usually means that the FW was unable
1202                  * to allocate the time events. Warn on it, but maybe we
1203                  * should try to send the command again with different params.
1204                  */
1205                 IWL_ERR(mvm, "Scan failed! ret %d\n", ret);
1206         }
1207
1208         if (ret)
1209                 iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
1210
1211         return ret;
1212 }
1213
1214 int iwl_mvm_sched_scan_start(struct iwl_mvm *mvm,
1215                              struct ieee80211_vif *vif,
1216                              struct cfg80211_sched_scan_request *req,
1217                              struct ieee80211_scan_ies *ies,
1218                              int type)
1219 {
1220         struct iwl_host_cmd hcmd = {
1221                 .len = { iwl_mvm_scan_size(mvm), },
1222                 .data = { mvm->scan_cmd, },
1223                 .dataflags = { IWL_HCMD_DFL_NOCOPY, },
1224         };
1225         struct iwl_mvm_scan_params params = {};
1226         int ret;
1227
1228         lockdep_assert_held(&mvm->mutex);
1229
1230         if (iwl_mvm_is_lar_supported(mvm) && !mvm->lar_regdom_set) {
1231                 IWL_ERR(mvm, "sched-scan while LAR regdomain is not set\n");
1232                 return -EBUSY;
1233         }
1234
1235         ret = iwl_mvm_check_running_scans(mvm, type);
1236         if (ret)
1237                 return ret;
1238
1239         /* we should have failed registration if scan_cmd was NULL */
1240         if (WARN_ON(!mvm->scan_cmd))
1241                 return -ENOMEM;
1242
1243         if (!iwl_mvm_scan_fits(mvm, req->n_ssids, ies, req->n_channels))
1244                 return -ENOBUFS;
1245
1246         params.n_ssids = req->n_ssids;
1247         params.flags = req->flags;
1248         params.n_channels = req->n_channels;
1249         params.ssids = req->ssids;
1250         params.channels = req->channels;
1251         params.mac_addr = req->mac_addr;
1252         params.mac_addr_mask = req->mac_addr_mask;
1253         params.no_cck = false;
1254         params.pass_all =  iwl_mvm_scan_pass_all(mvm, req);
1255         params.n_match_sets = req->n_match_sets;
1256         params.match_sets = req->match_sets;
1257
1258         params.schedule[0].iterations = IWL_FAST_SCHED_SCAN_ITERATIONS;
1259         params.schedule[0].full_scan_mul = 1;
1260         params.schedule[1].iterations = 0xff;
1261         params.schedule[1].full_scan_mul = IWL_FULL_SCAN_MULTIPLIER;
1262
1263         if (req->interval > U16_MAX) {
1264                 IWL_DEBUG_SCAN(mvm,
1265                                "interval value is > 16-bits, set to max possible\n");
1266                 params.interval = U16_MAX;
1267         } else {
1268                 params.interval = req->interval / MSEC_PER_SEC;
1269         }
1270
1271         /* In theory, LMAC scans can handle a 32-bit delay, but since
1272          * waiting for over 18 hours to start the scan is a bit silly
1273          * and to keep it aligned with UMAC scans (which only support
1274          * 16-bit delays), trim it down to 16-bits.
1275          */
1276         if (req->delay > U16_MAX) {
1277                 IWL_DEBUG_SCAN(mvm,
1278                                "delay value is > 16-bits, set to max possible\n");
1279                 params.delay = U16_MAX;
1280         } else {
1281                 params.delay = req->delay;
1282         }
1283
1284         iwl_mvm_scan_calc_dwell(mvm, vif, &params);
1285
1286         ret = iwl_mvm_config_sched_scan_profiles(mvm, req);
1287         if (ret)
1288                 return ret;
1289
1290         iwl_mvm_build_scan_probe(mvm, vif, ies, &params);
1291
1292         if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_UMAC_SCAN)) {
1293                 hcmd.id = iwl_cmd_id(SCAN_REQ_UMAC, IWL_ALWAYS_LONG_GROUP, 0);
1294                 ret = iwl_mvm_scan_umac(mvm, vif, &params, IWL_MVM_SCAN_SCHED);
1295         } else {
1296                 hcmd.id = SCAN_OFFLOAD_REQUEST_CMD;
1297                 ret = iwl_mvm_scan_lmac(mvm, vif, &params);
1298         }
1299
1300         if (ret)
1301                 return ret;
1302
1303         ret = iwl_mvm_send_cmd(mvm, &hcmd);
1304         if (!ret) {
1305                 IWL_DEBUG_SCAN(mvm,
1306                                "Sched scan request was sent successfully\n");
1307                 mvm->scan_status |= type;
1308         } else {
1309                 /* If the scan failed, it usually means that the FW was unable
1310                  * to allocate the time events. Warn on it, but maybe we
1311                  * should try to send the command again with different params.
1312                  */
1313                 IWL_ERR(mvm, "Sched scan failed! ret %d\n", ret);
1314         }
1315
1316         return ret;
1317 }
1318
1319 void iwl_mvm_rx_umac_scan_complete_notif(struct iwl_mvm *mvm,
1320                                          struct iwl_rx_cmd_buffer *rxb)
1321 {
1322         struct iwl_rx_packet *pkt = rxb_addr(rxb);
1323         struct iwl_umac_scan_complete *notif = (void *)pkt->data;
1324         u32 uid = __le32_to_cpu(notif->uid);
1325         bool aborted = (notif->status == IWL_SCAN_OFFLOAD_ABORTED);
1326
1327         if (WARN_ON(!(mvm->scan_uid_status[uid] & mvm->scan_status)))
1328                 return;
1329
1330         /* if the scan is already stopping, we don't need to notify mac80211 */
1331         if (mvm->scan_uid_status[uid] == IWL_MVM_SCAN_REGULAR) {
1332                 ieee80211_scan_completed(mvm->hw, aborted);
1333                 iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
1334         } else if (mvm->scan_uid_status[uid] == IWL_MVM_SCAN_SCHED) {
1335                 ieee80211_sched_scan_stopped(mvm->hw);
1336         }
1337
1338         mvm->scan_status &= ~mvm->scan_uid_status[uid];
1339
1340         IWL_DEBUG_SCAN(mvm,
1341                        "Scan completed, uid %u type %u, status %s, EBS status %s\n",
1342                        uid, mvm->scan_uid_status[uid],
1343                        notif->status == IWL_SCAN_OFFLOAD_COMPLETED ?
1344                                 "completed" : "aborted",
1345                        iwl_mvm_ebs_status_str(notif->ebs_status));
1346
1347         if (notif->ebs_status != IWL_SCAN_EBS_SUCCESS &&
1348             notif->ebs_status != IWL_SCAN_EBS_INACTIVE)
1349                 mvm->last_ebs_successful = false;
1350
1351         mvm->scan_uid_status[uid] = 0;
1352 }
1353
1354 void iwl_mvm_rx_umac_scan_iter_complete_notif(struct iwl_mvm *mvm,
1355                                               struct iwl_rx_cmd_buffer *rxb)
1356 {
1357         struct iwl_rx_packet *pkt = rxb_addr(rxb);
1358         struct iwl_umac_scan_iter_complete_notif *notif = (void *)pkt->data;
1359         u8 buf[256];
1360
1361         IWL_DEBUG_SCAN(mvm,
1362                        "UMAC Scan iteration complete: status=0x%x scanned_channels=%d channels list: %s\n",
1363                        notif->status, notif->scanned_channels,
1364                        iwl_mvm_dump_channel_list(notif->results,
1365                                                  notif->scanned_channels, buf,
1366                                                  sizeof(buf)));
1367 }
1368
1369 static int iwl_mvm_umac_scan_abort(struct iwl_mvm *mvm, int type)
1370 {
1371         struct iwl_umac_scan_abort cmd = {};
1372         int uid, ret;
1373
1374         lockdep_assert_held(&mvm->mutex);
1375
1376         /* We should always get a valid index here, because we already
1377          * checked that this type of scan was running in the generic
1378          * code.
1379          */
1380         uid = iwl_mvm_scan_uid_by_status(mvm, type);
1381         if (WARN_ON_ONCE(uid < 0))
1382                 return uid;
1383
1384         cmd.uid = cpu_to_le32(uid);
1385
1386         IWL_DEBUG_SCAN(mvm, "Sending scan abort, uid %u\n", uid);
1387
1388         ret = iwl_mvm_send_cmd_pdu(mvm,
1389                                    iwl_cmd_id(SCAN_ABORT_UMAC,
1390                                               IWL_ALWAYS_LONG_GROUP, 0),
1391                                    0, sizeof(cmd), &cmd);
1392         if (!ret)
1393                 mvm->scan_uid_status[uid] = type << IWL_MVM_SCAN_STOPPING_SHIFT;
1394
1395         return ret;
1396 }
1397
1398 static int iwl_mvm_scan_stop_wait(struct iwl_mvm *mvm, int type)
1399 {
1400         struct iwl_notification_wait wait_scan_done;
1401         static const u16 scan_done_notif[] = { SCAN_COMPLETE_UMAC,
1402                                               SCAN_OFFLOAD_COMPLETE, };
1403         int ret;
1404
1405         lockdep_assert_held(&mvm->mutex);
1406
1407         iwl_init_notification_wait(&mvm->notif_wait, &wait_scan_done,
1408                                    scan_done_notif,
1409                                    ARRAY_SIZE(scan_done_notif),
1410                                    NULL, NULL);
1411
1412         IWL_DEBUG_SCAN(mvm, "Preparing to stop scan, type %x\n", type);
1413
1414         if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_UMAC_SCAN))
1415                 ret = iwl_mvm_umac_scan_abort(mvm, type);
1416         else
1417                 ret = iwl_mvm_lmac_scan_abort(mvm);
1418
1419         if (ret) {
1420                 IWL_DEBUG_SCAN(mvm, "couldn't stop scan type %d\n", type);
1421                 iwl_remove_notification(&mvm->notif_wait, &wait_scan_done);
1422                 return ret;
1423         }
1424
1425         ret = iwl_wait_notification(&mvm->notif_wait, &wait_scan_done, 1 * HZ);
1426
1427         return ret;
1428 }
1429
1430 int iwl_mvm_scan_size(struct iwl_mvm *mvm)
1431 {
1432         if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_UMAC_SCAN))
1433                 return sizeof(struct iwl_scan_req_umac) +
1434                         sizeof(struct iwl_scan_channel_cfg_umac) *
1435                                 mvm->fw->ucode_capa.n_scan_channels +
1436                         sizeof(struct iwl_scan_req_umac_tail);
1437
1438         return sizeof(struct iwl_scan_req_lmac) +
1439                 sizeof(struct iwl_scan_channel_cfg_lmac) *
1440                 mvm->fw->ucode_capa.n_scan_channels +
1441                 sizeof(struct iwl_scan_probe_req);
1442 }
1443
1444 /*
1445  * This function is used in nic restart flow, to inform mac80211 about scans
1446  * that was aborted by restart flow or by an assert.
1447  */
1448 void iwl_mvm_report_scan_aborted(struct iwl_mvm *mvm)
1449 {
1450         if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_UMAC_SCAN)) {
1451                 int uid, i;
1452
1453                 uid = iwl_mvm_scan_uid_by_status(mvm, IWL_MVM_SCAN_REGULAR);
1454                 if (uid >= 0) {
1455                         ieee80211_scan_completed(mvm->hw, true);
1456                         mvm->scan_uid_status[uid] = 0;
1457                 }
1458                 uid = iwl_mvm_scan_uid_by_status(mvm, IWL_MVM_SCAN_SCHED);
1459                 if (uid >= 0 && !mvm->restart_fw) {
1460                         ieee80211_sched_scan_stopped(mvm->hw);
1461                         mvm->scan_uid_status[uid] = 0;
1462                 }
1463
1464                 /* We shouldn't have any UIDs still set.  Loop over all the
1465                  * UIDs to make sure there's nothing left there and warn if
1466                  * any is found.
1467                  */
1468                 for (i = 0; i < mvm->max_scans; i++) {
1469                         if (WARN_ONCE(mvm->scan_uid_status[i],
1470                                       "UMAC scan UID %d status was not cleaned\n",
1471                                       i))
1472                                 mvm->scan_uid_status[i] = 0;
1473                 }
1474         } else {
1475                 if (mvm->scan_status & IWL_MVM_SCAN_REGULAR)
1476                         ieee80211_scan_completed(mvm->hw, true);
1477
1478                 /* Sched scan will be restarted by mac80211 in
1479                  * restart_hw, so do not report if FW is about to be
1480                  * restarted.
1481                  */
1482                 if ((mvm->scan_status & IWL_MVM_SCAN_SCHED) && !mvm->restart_fw)
1483                         ieee80211_sched_scan_stopped(mvm->hw);
1484         }
1485 }
1486
1487 int iwl_mvm_scan_stop(struct iwl_mvm *mvm, int type, bool notify)
1488 {
1489         int ret;
1490
1491         if (!(mvm->scan_status & type))
1492                 return 0;
1493
1494         if (iwl_mvm_is_radio_killed(mvm)) {
1495                 ret = 0;
1496                 goto out;
1497         }
1498
1499         ret = iwl_mvm_scan_stop_wait(mvm, type);
1500         if (!ret)
1501                 mvm->scan_status |= type << IWL_MVM_SCAN_STOPPING_SHIFT;
1502 out:
1503         /* Clear the scan status so the next scan requests will
1504          * succeed and mark the scan as stopping, so that the Rx
1505          * handler doesn't do anything, as the scan was stopped from
1506          * above.
1507          */
1508         mvm->scan_status &= ~type;
1509
1510         if (type == IWL_MVM_SCAN_REGULAR) {
1511                 /* Since the rx handler won't do anything now, we have
1512                  * to release the scan reference here.
1513                  */
1514                 iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
1515                 if (notify)
1516                         ieee80211_scan_completed(mvm->hw, true);
1517         } else if (notify) {
1518                 ieee80211_sched_scan_stopped(mvm->hw);
1519         }
1520
1521         return ret;
1522 }