drivers/net/wireless/intel/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 enum iwl_mvm_traffic_load {
  76         IWL_MVM_TRAFFIC_LOW,
  77         IWL_MVM_TRAFFIC_MEDIUM,
  78         IWL_MVM_TRAFFIC_HIGH,
  79 };
  80
  81 struct iwl_mvm_scan_timing_params {
  82         u32 dwell_active;
  83         u32 dwell_passive;
  84         u32 dwell_fragmented;
  85         u32 dwell_extended;
  86         u32 suspend_time;
  87         u32 max_out_time;
  88 };
  89
  90 static struct iwl_mvm_scan_timing_params scan_timing[] = {
  91         [IWL_SCAN_TYPE_UNASSOC] = {
  92                 .dwell_active = 10,
  93                 .dwell_passive = 110,
  94                 .dwell_fragmented = 44,
  95                 .dwell_extended = 90,
  96                 .suspend_time = 0,
  97                 .max_out_time = 0,
  98         },
  99         [IWL_SCAN_TYPE_WILD] = {
 100                 .dwell_active = 10,
 101                 .dwell_passive = 110,
 102                 .dwell_fragmented = 44,
 103                 .dwell_extended = 90,
 104                 .suspend_time = 30,
 105                 .max_out_time = 120,
 106         },
 107         [IWL_SCAN_TYPE_MILD] = {
 108                 .dwell_active = 10,
 109                 .dwell_passive = 110,
 110                 .dwell_fragmented = 44,
 111                 .dwell_extended = 90,
 112                 .suspend_time = 120,
 113                 .max_out_time = 120,
 114         },
 115         [IWL_SCAN_TYPE_FRAGMENTED] = {
 116                 .dwell_active = 10,
 117                 .dwell_passive = 110,
 118                 .dwell_fragmented = 44,
 119                 .suspend_time = 95,
 120                 .max_out_time = 44,
 121         },
 122 };
 123
 124 struct iwl_mvm_scan_params {
 125         enum iwl_mvm_scan_type type;
 126         u32 n_channels;
 127         u16 delay;
 128         int n_ssids;
 129         struct cfg80211_ssid *ssids;
 130         struct ieee80211_channel **channels;
 131         u32 flags;
 132         u8 *mac_addr;
 133         u8 *mac_addr_mask;
 134         bool no_cck;
 135         bool pass_all;
 136         int n_match_sets;
 137         struct iwl_scan_probe_req preq;
 138         struct cfg80211_match_set *match_sets;
 139         int n_scan_plans;
 140         struct cfg80211_sched_scan_plan *scan_plans;
 141 };
 142
 143 static u8 iwl_mvm_scan_rx_ant(struct iwl_mvm *mvm)
 144 {
 145         if (mvm->scan_rx_ant != ANT_NONE)
 146                 return mvm->scan_rx_ant;
 147         return iwl_mvm_get_valid_rx_ant(mvm);
 148 }
 149
 150 static inline __le16 iwl_mvm_scan_rx_chain(struct iwl_mvm *mvm)
 151 {
 152         u16 rx_chain;
 153         u8 rx_ant;
 154
 155         rx_ant = iwl_mvm_scan_rx_ant(mvm);
 156         rx_chain = rx_ant << PHY_RX_CHAIN_VALID_POS;
 157         rx_chain |= rx_ant << PHY_RX_CHAIN_FORCE_MIMO_SEL_POS;
 158         rx_chain |= rx_ant << PHY_RX_CHAIN_FORCE_SEL_POS;
 159         rx_chain |= 0x1 << PHY_RX_CHAIN_DRIVER_FORCE_POS;
 160         return cpu_to_le16(rx_chain);
 161 }
 162
 163 static __le32 iwl_mvm_scan_rxon_flags(enum ieee80211_band band)
 164 {
 165         if (band == IEEE80211_BAND_2GHZ)
 166                 return cpu_to_le32(PHY_BAND_24);
 167         else
 168                 return cpu_to_le32(PHY_BAND_5);
 169 }
 170
 171 static inline __le32
 172 iwl_mvm_scan_rate_n_flags(struct iwl_mvm *mvm, enum ieee80211_band band,
 173                           bool no_cck)
 174 {
 175         u32 tx_ant;
 176
 177         mvm->scan_last_antenna_idx =
 178                 iwl_mvm_next_antenna(mvm, iwl_mvm_get_valid_tx_ant(mvm),
 179                                      mvm->scan_last_antenna_idx);
 180         tx_ant = BIT(mvm->scan_last_antenna_idx) << RATE_MCS_ANT_POS;
 181
 182         if (band == IEEE80211_BAND_2GHZ && !no_cck)
 183                 return cpu_to_le32(IWL_RATE_1M_PLCP | RATE_MCS_CCK_MSK |
 184                                    tx_ant);
 185         else
 186                 return cpu_to_le32(IWL_RATE_6M_PLCP | tx_ant);
 187 }
 188
 189 static void iwl_mvm_scan_condition_iterator(void *data, u8 *mac,
 190                                             struct ieee80211_vif *vif)
 191 {
 192         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 193         int *global_cnt = data;
 194
 195         if (vif->type != NL80211_IFTYPE_P2P_DEVICE && mvmvif->phy_ctxt &&
 196             mvmvif->phy_ctxt->id < MAX_PHYS)
 197                 *global_cnt += 1;
 198 }
 199
 200 static enum iwl_mvm_traffic_load iwl_mvm_get_traffic_load(struct iwl_mvm *mvm)
 201 {
 202         return IWL_MVM_TRAFFIC_LOW;
 203 }
 204
 205 static enum
 206 iwl_mvm_scan_type iwl_mvm_get_scan_type(struct iwl_mvm *mvm, bool p2p_device)
 207 {
 208         int global_cnt = 0;
 209         enum iwl_mvm_traffic_load load;
 210         bool low_latency;
 211
 212         ieee80211_iterate_active_interfaces_atomic(mvm->hw,
 213                                             IEEE80211_IFACE_ITER_NORMAL,
 214                                             iwl_mvm_scan_condition_iterator,
 215                                             &global_cnt);
 216         if (!global_cnt)
 217                 return IWL_SCAN_TYPE_UNASSOC;
 218
 219         load = iwl_mvm_get_traffic_load(mvm);
 220         low_latency = iwl_mvm_low_latency(mvm);
 221
 222         if ((load == IWL_MVM_TRAFFIC_HIGH || low_latency) && !p2p_device &&
 223             fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_FRAGMENTED_SCAN))
 224                 return IWL_SCAN_TYPE_FRAGMENTED;
 225
 226         if (load >= IWL_MVM_TRAFFIC_MEDIUM || low_latency)
 227                 return IWL_SCAN_TYPE_MILD;
 228
 229         return IWL_SCAN_TYPE_WILD;
 230 }
 231
 232 static inline bool iwl_mvm_rrm_scan_needed(struct iwl_mvm *mvm)
 233 {
 234         /* require rrm scan whenever the fw supports it */
 235         return fw_has_capa(&mvm->fw->ucode_capa,
 236                            IWL_UCODE_TLV_CAPA_DS_PARAM_SET_IE_SUPPORT);
 237 }
 238
 239 static int iwl_mvm_max_scan_ie_fw_cmd_room(struct iwl_mvm *mvm)
 240 {
 241         int max_probe_len;
 242
 243         max_probe_len = SCAN_OFFLOAD_PROBE_REQ_SIZE;
 244
 245         /* we create the 802.11 header and SSID element */
 246         max_probe_len -= 24 + 2;
 247
 248         /* DS parameter set element is added on 2.4GHZ band if required */
 249         if (iwl_mvm_rrm_scan_needed(mvm))
 250                 max_probe_len -= 3;
 251
 252         return max_probe_len;
 253 }
 254
 255 int iwl_mvm_max_scan_ie_len(struct iwl_mvm *mvm)
 256 {
 257         int max_ie_len = iwl_mvm_max_scan_ie_fw_cmd_room(mvm);
 258
 259         /* TODO: [BUG] This function should return the maximum allowed size of
 260          * scan IEs, however the LMAC scan api contains both 2GHZ and 5GHZ IEs
 261          * in the same command. So the correct implementation of this function
 262          * is just iwl_mvm_max_scan_ie_fw_cmd_room() / 2. Currently the scan
 263          * command has only 512 bytes and it would leave us with about 240
 264          * bytes for scan IEs, which is clearly not enough. So meanwhile
 265          * we will report an incorrect value. This may result in a failure to
 266          * issue a scan in unified_scan_lmac and unified_sched_scan_lmac
 267          * functions with -ENOBUFS, if a large enough probe will be provided.
 268          */
 269         return max_ie_len;
 270 }
 271
 272 static u8 *iwl_mvm_dump_channel_list(struct iwl_scan_results_notif *res,
 273                                      int num_res, u8 *buf, size_t buf_size)
 274 {
 275         int i;
 276         u8 *pos = buf, *end = buf + buf_size;
 277
 278         for (i = 0; pos < end && i < num_res; i++)
 279                 pos += snprintf(pos, end - pos, " %u", res[i].channel);
 280
 281         /* terminate the string in case the buffer was too short */
 282         *(buf + buf_size - 1) = '\0';
 283
 284         return buf;
 285 }
 286
 287 void iwl_mvm_rx_lmac_scan_iter_complete_notif(struct iwl_mvm *mvm,
 288                                               struct iwl_rx_cmd_buffer *rxb)
 289 {
 290         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 291         struct iwl_lmac_scan_complete_notif *notif = (void *)pkt->data;
 292         u8 buf[256];
 293
 294         IWL_DEBUG_SCAN(mvm,
 295                        "Scan offload iteration complete: status=0x%x scanned channels=%d channels list: %s\n",
 296                        notif->status, notif->scanned_channels,
 297                        iwl_mvm_dump_channel_list(notif->results,
 298                                                  notif->scanned_channels, buf,
 299                                                  sizeof(buf)));
 300 }
 301
 302 void iwl_mvm_rx_scan_match_found(struct iwl_mvm *mvm,
 303                                  struct iwl_rx_cmd_buffer *rxb)
 304 {
 305         IWL_DEBUG_SCAN(mvm, "Scheduled scan results\n");
 306         ieee80211_sched_scan_results(mvm->hw);
 307 }
 308
 309 static const char *iwl_mvm_ebs_status_str(enum iwl_scan_ebs_status status)
 310 {
 311         switch (status) {
 312         case IWL_SCAN_EBS_SUCCESS:
 313                 return "successful";
 314         case IWL_SCAN_EBS_INACTIVE:
 315                 return "inactive";
 316         case IWL_SCAN_EBS_FAILED:
 317         case IWL_SCAN_EBS_CHAN_NOT_FOUND:
 318         default:
 319                 return "failed";
 320         }
 321 }
 322
 323 void iwl_mvm_rx_lmac_scan_complete_notif(struct iwl_mvm *mvm,
 324                                          struct iwl_rx_cmd_buffer *rxb)
 325 {
 326         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 327         struct iwl_periodic_scan_complete *scan_notif = (void *)pkt->data;
 328         bool aborted = (scan_notif->status == IWL_SCAN_OFFLOAD_ABORTED);
 329
 330         /* If this happens, the firmware has mistakenly sent an LMAC
 331          * notification during UMAC scans -- warn and ignore it.
 332          */
 333         if (WARN_ON_ONCE(fw_has_capa(&mvm->fw->ucode_capa,
 334                                      IWL_UCODE_TLV_CAPA_UMAC_SCAN)))
 335                 return;
 336
 337         /* scan status must be locked for proper checking */
 338         lockdep_assert_held(&mvm->mutex);
 339
 340         /* We first check if we were stopping a scan, in which case we
 341          * just clear the stopping flag.  Then we check if it was a
 342          * firmware initiated stop, in which case we need to inform
 343          * mac80211.
 344          * Note that we can have a stopping and a running scan
 345          * simultaneously, but we can't have two different types of
 346          * scans stopping or running at the same time (since LMAC
 347          * doesn't support it).
 348          */
 349
 350         if (mvm->scan_status & IWL_MVM_SCAN_STOPPING_SCHED) {
 351                 WARN_ON_ONCE(mvm->scan_status & IWL_MVM_SCAN_STOPPING_REGULAR);
 352
 353                 IWL_DEBUG_SCAN(mvm, "Scheduled scan %s, EBS status %s\n",
 354                                aborted ? "aborted" : "completed",
 355                                iwl_mvm_ebs_status_str(scan_notif->ebs_status));
 356                 IWL_DEBUG_SCAN(mvm,
 357                                "Last line %d, Last iteration %d, Time after last iteration %d\n",
 358                                scan_notif->last_schedule_line,
 359                                scan_notif->last_schedule_iteration,
 360                                __le32_to_cpu(scan_notif->time_after_last_iter));
 361
 362                 mvm->scan_status &= ~IWL_MVM_SCAN_STOPPING_SCHED;
 363         } else if (mvm->scan_status & IWL_MVM_SCAN_STOPPING_REGULAR) {
 364                 IWL_DEBUG_SCAN(mvm, "Regular scan %s, EBS status %s\n",
 365                                aborted ? "aborted" : "completed",
 366                                iwl_mvm_ebs_status_str(scan_notif->ebs_status));
 367
 368                 mvm->scan_status &= ~IWL_MVM_SCAN_STOPPING_REGULAR;
 369         } else if (mvm->scan_status & IWL_MVM_SCAN_SCHED) {
 370                 WARN_ON_ONCE(mvm->scan_status & IWL_MVM_SCAN_REGULAR);
 371
 372                 IWL_DEBUG_SCAN(mvm, "Scheduled scan %s, EBS status %s\n",
 373                                aborted ? "aborted" : "completed",
 374                                iwl_mvm_ebs_status_str(scan_notif->ebs_status));
 375                 IWL_DEBUG_SCAN(mvm,
 376                                "Last line %d, Last iteration %d, Time after last iteration %d (FW)\n",
 377                                scan_notif->last_schedule_line,
 378                                scan_notif->last_schedule_iteration,
 379                                __le32_to_cpu(scan_notif->time_after_last_iter));
 380
 381                 mvm->scan_status &= ~IWL_MVM_SCAN_SCHED;
 382                 ieee80211_sched_scan_stopped(mvm->hw);
 383         } else if (mvm->scan_status & IWL_MVM_SCAN_REGULAR) {
 384                 IWL_DEBUG_SCAN(mvm, "Regular scan %s, EBS status %s (FW)\n",
 385                                aborted ? "aborted" : "completed",
 386                                iwl_mvm_ebs_status_str(scan_notif->ebs_status));
 387
 388                 mvm->scan_status &= ~IWL_MVM_SCAN_REGULAR;
 389                 ieee80211_scan_completed(mvm->hw,
 390                                 scan_notif->status == IWL_SCAN_OFFLOAD_ABORTED);
 391                 iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
 392         }
 393
 394         mvm->last_ebs_successful =
 395                         scan_notif->ebs_status == IWL_SCAN_EBS_SUCCESS ||
 396                         scan_notif->ebs_status == IWL_SCAN_EBS_INACTIVE;
 397 }
 398
 399 static int iwl_ssid_exist(u8 *ssid, u8 ssid_len, struct iwl_ssid_ie *ssid_list)
 400 {
 401         int i;
 402
 403         for (i = 0; i < PROBE_OPTION_MAX; i++) {
 404                 if (!ssid_list[i].len)
 405                         break;
 406                 if (ssid_list[i].len == ssid_len &&
 407                     !memcmp(ssid_list->ssid, ssid, ssid_len))
 408                         return i;
 409         }
 410         return -1;
 411 }
 412
 413 /* We insert the SSIDs in an inverted order, because the FW will
 414  * invert it back.
 415  */
 416 static void iwl_scan_build_ssids(struct iwl_mvm_scan_params *params,
 417                                  struct iwl_ssid_ie *ssids,
 418                                  u32 *ssid_bitmap)
 419 {
 420         int i, j;
 421         int index;
 422
 423         /*
 424          * copy SSIDs from match list.
 425          * iwl_config_sched_scan_profiles() uses the order of these ssids to
 426          * config match list.
 427          */
 428         for (i = 0, j = params->n_match_sets - 1;
 429              j >= 0 && i < PROBE_OPTION_MAX;
 430              i++, j--) {
 431                 /* skip empty SSID matchsets */
 432                 if (!params->match_sets[j].ssid.ssid_len)
 433                         continue;
 434                 ssids[i].id = WLAN_EID_SSID;
 435                 ssids[i].len = params->match_sets[j].ssid.ssid_len;
 436                 memcpy(ssids[i].ssid, params->match_sets[j].ssid.ssid,
 437                        ssids[i].len);
 438         }
 439
 440         /* add SSIDs from scan SSID list */
 441         *ssid_bitmap = 0;
 442         for (j = params->n_ssids - 1;
 443              j >= 0 && i < PROBE_OPTION_MAX;
 444              i++, j--) {
 445                 index = iwl_ssid_exist(params->ssids[j].ssid,
 446                                        params->ssids[j].ssid_len,
 447                                        ssids);
 448                 if (index < 0) {
 449                         ssids[i].id = WLAN_EID_SSID;
 450                         ssids[i].len = params->ssids[j].ssid_len;
 451                         memcpy(ssids[i].ssid, params->ssids[j].ssid,
 452                                ssids[i].len);
 453                         *ssid_bitmap |= BIT(i);
 454                 } else {
 455                         *ssid_bitmap |= BIT(index);
 456                 }
 457         }
 458 }
 459
 460 static int
 461 iwl_mvm_config_sched_scan_profiles(struct iwl_mvm *mvm,
 462                                    struct cfg80211_sched_scan_request *req)
 463 {
 464         struct iwl_scan_offload_profile *profile;
 465         struct iwl_scan_offload_profile_cfg *profile_cfg;
 466         struct iwl_scan_offload_blacklist *blacklist;
 467         struct iwl_host_cmd cmd = {
 468                 .id = SCAN_OFFLOAD_UPDATE_PROFILES_CMD,
 469                 .len[1] = sizeof(*profile_cfg),
 470                 .dataflags[0] = IWL_HCMD_DFL_NOCOPY,
 471                 .dataflags[1] = IWL_HCMD_DFL_NOCOPY,
 472         };
 473         int blacklist_len;
 474         int i;
 475         int ret;
 476
 477         if (WARN_ON(req->n_match_sets > IWL_SCAN_MAX_PROFILES))
 478                 return -EIO;
 479
 480         if (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_SHORT_BL)
 481                 blacklist_len = IWL_SCAN_SHORT_BLACKLIST_LEN;
 482         else
 483                 blacklist_len = IWL_SCAN_MAX_BLACKLIST_LEN;
 484
 485         blacklist = kzalloc(sizeof(*blacklist) * blacklist_len, GFP_KERNEL);
 486         if (!blacklist)
 487                 return -ENOMEM;
 488
 489         profile_cfg = kzalloc(sizeof(*profile_cfg), GFP_KERNEL);
 490         if (!profile_cfg) {
 491                 ret = -ENOMEM;
 492                 goto free_blacklist;
 493         }
 494
 495         cmd.data[0] = blacklist;
 496         cmd.len[0] = sizeof(*blacklist) * blacklist_len;
 497         cmd.data[1] = profile_cfg;
 498
 499         /* No blacklist configuration */
 500
 501         profile_cfg->num_profiles = req->n_match_sets;
 502         profile_cfg->active_clients = SCAN_CLIENT_SCHED_SCAN;
 503         profile_cfg->pass_match = SCAN_CLIENT_SCHED_SCAN;
 504         profile_cfg->match_notify = SCAN_CLIENT_SCHED_SCAN;
 505         if (!req->n_match_sets || !req->match_sets[0].ssid.ssid_len)
 506                 profile_cfg->any_beacon_notify = SCAN_CLIENT_SCHED_SCAN;
 507
 508         for (i = 0; i < req->n_match_sets; i++) {
 509                 profile = &profile_cfg->profiles[i];
 510                 profile->ssid_index = i;
 511                 /* Support any cipher and auth algorithm */
 512                 profile->unicast_cipher = 0xff;
 513                 profile->auth_alg = 0xff;
 514                 profile->network_type = IWL_NETWORK_TYPE_ANY;
 515                 profile->band_selection = IWL_SCAN_OFFLOAD_SELECT_ANY;
 516                 profile->client_bitmap = SCAN_CLIENT_SCHED_SCAN;
 517         }
 518
 519         IWL_DEBUG_SCAN(mvm, "Sending scheduled scan profile config\n");
 520
 521         ret = iwl_mvm_send_cmd(mvm, &cmd);
 522         kfree(profile_cfg);
 523 free_blacklist:
 524         kfree(blacklist);
 525
 526         return ret;
 527 }
 528
 529 static bool iwl_mvm_scan_pass_all(struct iwl_mvm *mvm,
 530                                   struct cfg80211_sched_scan_request *req)
 531 {
 532         if (req->n_match_sets && req->match_sets[0].ssid.ssid_len) {
 533                 IWL_DEBUG_SCAN(mvm,
 534                                "Sending scheduled scan with filtering, n_match_sets %d\n",
 535                                req->n_match_sets);
 536                 return false;
 537         }
 538
 539         IWL_DEBUG_SCAN(mvm, "Sending Scheduled scan without filtering\n");
 540         return true;
 541 }
 542
 543 static int iwl_mvm_lmac_scan_abort(struct iwl_mvm *mvm)
 544 {
 545         int ret;
 546         struct iwl_host_cmd cmd = {
 547                 .id = SCAN_OFFLOAD_ABORT_CMD,
 548         };
 549         u32 status;
 550
 551         ret = iwl_mvm_send_cmd_status(mvm, &cmd, &status);
 552         if (ret)
 553                 return ret;
 554
 555         if (status != CAN_ABORT_STATUS) {
 556                 /*
 557                  * The scan abort will return 1 for success or
 558                  * 2 for "failure".  A failure condition can be
 559                  * due to simply not being in an active scan which
 560                  * can occur if we send the scan abort before the
 561                  * microcode has notified us that a scan is completed.
 562                  */
 563                 IWL_DEBUG_SCAN(mvm, "SCAN OFFLOAD ABORT ret %d.\n", status);
 564                 ret = -ENOENT;
 565         }
 566
 567         return ret;
 568 }
 569
 570 static void iwl_mvm_scan_fill_tx_cmd(struct iwl_mvm *mvm,
 571                                      struct iwl_scan_req_tx_cmd *tx_cmd,
 572                                      bool no_cck)
 573 {
 574         tx_cmd[0].tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL |
 575                                          TX_CMD_FLG_BT_DIS);
 576         tx_cmd[0].rate_n_flags = iwl_mvm_scan_rate_n_flags(mvm,
 577                                                            IEEE80211_BAND_2GHZ,
 578                                                            no_cck);
 579         tx_cmd[0].sta_id = mvm->aux_sta.sta_id;
 580
 581         tx_cmd[1].tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL |
 582                                          TX_CMD_FLG_BT_DIS);
 583         tx_cmd[1].rate_n_flags = iwl_mvm_scan_rate_n_flags(mvm,
 584                                                            IEEE80211_BAND_5GHZ,
 585                                                            no_cck);
 586         tx_cmd[1].sta_id = mvm->aux_sta.sta_id;
 587 }
 588
 589 static void
 590 iwl_mvm_lmac_scan_cfg_channels(struct iwl_mvm *mvm,
 591                                struct ieee80211_channel **channels,
 592                                int n_channels, u32 ssid_bitmap,
 593                                struct iwl_scan_req_lmac *cmd)
 594 {
 595         struct iwl_scan_channel_cfg_lmac *channel_cfg = (void *)&cmd->data;
 596         int i;
 597
 598         for (i = 0; i < n_channels; i++) {
 599                 channel_cfg[i].channel_num =
 600                         cpu_to_le16(channels[i]->hw_value);
 601                 channel_cfg[i].iter_count = cpu_to_le16(1);
 602                 channel_cfg[i].iter_interval = 0;
 603                 channel_cfg[i].flags =
 604                         cpu_to_le32(IWL_UNIFIED_SCAN_CHANNEL_PARTIAL |
 605                                     ssid_bitmap);
 606         }
 607 }
 608
 609 static u8 *iwl_mvm_copy_and_insert_ds_elem(struct iwl_mvm *mvm, const u8 *ies,
 610                                            size_t len, u8 *const pos)
 611 {
 612         static const u8 before_ds_params[] = {
 613                         WLAN_EID_SSID,
 614                         WLAN_EID_SUPP_RATES,
 615                         WLAN_EID_REQUEST,
 616                         WLAN_EID_EXT_SUPP_RATES,
 617         };
 618         size_t offs;
 619         u8 *newpos = pos;
 620
 621         if (!iwl_mvm_rrm_scan_needed(mvm)) {
 622                 memcpy(newpos, ies, len);
 623                 return newpos + len;
 624         }
 625
 626         offs = ieee80211_ie_split(ies, len,
 627                                   before_ds_params,
 628                                   ARRAY_SIZE(before_ds_params),
 629                                   0);
 630
 631         memcpy(newpos, ies, offs);
 632         newpos += offs;
 633
 634         /* Add a placeholder for DS Parameter Set element */
 635         *newpos++ = WLAN_EID_DS_PARAMS;
 636         *newpos++ = 1;
 637         *newpos++ = 0;
 638
 639         memcpy(newpos, ies + offs, len - offs);
 640         newpos += len - offs;
 641
 642         return newpos;
 643 }
 644
 645 static void
 646 iwl_mvm_build_scan_probe(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 647                          struct ieee80211_scan_ies *ies,
 648                          struct iwl_mvm_scan_params *params)
 649 {
 650         struct ieee80211_mgmt *frame = (void *)params->preq.buf;
 651         u8 *pos, *newpos;
 652         const u8 *mac_addr = params->flags & NL80211_SCAN_FLAG_RANDOM_ADDR ?
 653                 params->mac_addr : NULL;
 654
 655         /*
 656          * Unfortunately, right now the offload scan doesn't support randomising
 657          * within the firmware, so until the firmware API is ready we implement
 658          * it in the driver. This means that the scan iterations won't really be
 659          * random, only when it's restarted, but at least that helps a bit.
 660          */
 661         if (mac_addr)
 662                 get_random_mask_addr(frame->sa, mac_addr,
 663                                      params->mac_addr_mask);
 664         else
 665                 memcpy(frame->sa, vif->addr, ETH_ALEN);
 666
 667         frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
 668         eth_broadcast_addr(frame->da);
 669         eth_broadcast_addr(frame->bssid);
 670         frame->seq_ctrl = 0;
 671
 672         pos = frame->u.probe_req.variable;
 673         *pos++ = WLAN_EID_SSID;
 674         *pos++ = 0;
 675
 676         params->preq.mac_header.offset = 0;
 677         params->preq.mac_header.len = cpu_to_le16(24 + 2);
 678
 679         /* Insert ds parameter set element on 2.4 GHz band */
 680         newpos = iwl_mvm_copy_and_insert_ds_elem(mvm,
 681                                                  ies->ies[IEEE80211_BAND_2GHZ],
 682                                                  ies->len[IEEE80211_BAND_2GHZ],
 683                                                  pos);
 684         params->preq.band_data[0].offset = cpu_to_le16(pos - params->preq.buf);
 685         params->preq.band_data[0].len = cpu_to_le16(newpos - pos);
 686         pos = newpos;
 687
 688         memcpy(pos, ies->ies[IEEE80211_BAND_5GHZ],
 689                ies->len[IEEE80211_BAND_5GHZ]);
 690         params->preq.band_data[1].offset = cpu_to_le16(pos - params->preq.buf);
 691         params->preq.band_data[1].len =
 692                 cpu_to_le16(ies->len[IEEE80211_BAND_5GHZ]);
 693         pos += ies->len[IEEE80211_BAND_5GHZ];
 694
 695         memcpy(pos, ies->common_ies, ies->common_ie_len);
 696         params->preq.common_data.offset = cpu_to_le16(pos - params->preq.buf);
 697         params->preq.common_data.len = cpu_to_le16(ies->common_ie_len);
 698 }
 699
 700 static __le32 iwl_mvm_scan_priority(struct iwl_mvm *mvm,
 701                                     enum iwl_scan_priority_ext prio)
 702 {
 703         if (fw_has_api(&mvm->fw->ucode_capa,
 704                        IWL_UCODE_TLV_API_EXT_SCAN_PRIORITY))
 705                 return cpu_to_le32(prio);
 706
 707         if (prio <= IWL_SCAN_PRIORITY_EXT_2)
 708                 return cpu_to_le32(IWL_SCAN_PRIORITY_LOW);
 709
 710         if (prio <= IWL_SCAN_PRIORITY_EXT_4)
 711                 return cpu_to_le32(IWL_SCAN_PRIORITY_MEDIUM);
 712
 713         return cpu_to_le32(IWL_SCAN_PRIORITY_HIGH);
 714 }
 715
 716 static void iwl_mvm_scan_lmac_dwell(struct iwl_mvm *mvm,
 717                                     struct iwl_scan_req_lmac *cmd,
 718                                     struct iwl_mvm_scan_params *params)
 719 {
 720         cmd->active_dwell = scan_timing[params->type].dwell_active;
 721         cmd->passive_dwell = scan_timing[params->type].dwell_passive;
 722         cmd->fragmented_dwell = scan_timing[params->type].dwell_fragmented;
 723         cmd->extended_dwell = scan_timing[params->type].dwell_extended;
 724         cmd->max_out_time = cpu_to_le32(scan_timing[params->type].max_out_time);
 725         cmd->suspend_time = cpu_to_le32(scan_timing[params->type].suspend_time);
 726         cmd->scan_prio = iwl_mvm_scan_priority(mvm, IWL_SCAN_PRIORITY_EXT_6);
 727 }
 728
 729 static inline bool iwl_mvm_scan_fits(struct iwl_mvm *mvm, int n_ssids,
 730                                      struct ieee80211_scan_ies *ies,
 731                                      int n_channels)
 732 {
 733         return ((n_ssids <= PROBE_OPTION_MAX) &&
 734                 (n_channels <= mvm->fw->ucode_capa.n_scan_channels) &
 735                 (ies->common_ie_len +
 736                  ies->len[NL80211_BAND_2GHZ] +
 737                  ies->len[NL80211_BAND_5GHZ] <=
 738                  iwl_mvm_max_scan_ie_fw_cmd_room(mvm)));
 739 }
 740
 741 static inline bool iwl_mvm_scan_use_ebs(struct iwl_mvm *mvm,
 742                                         struct ieee80211_vif *vif)
 743 {
 744         const struct iwl_ucode_capabilities *capa = &mvm->fw->ucode_capa;
 745
 746         /* We can only use EBS if:
 747          *      1. the feature is supported;
 748          *      2. the last EBS was successful;
 749          *      3. if only single scan, the single scan EBS API is supported;
 750          *      4. it's not a p2p find operation.
 751          */
 752         return ((capa->flags & IWL_UCODE_TLV_FLAGS_EBS_SUPPORT) &&
 753                 mvm->last_ebs_successful &&
 754                 vif->type != NL80211_IFTYPE_P2P_DEVICE);
 755 }
 756
 757 static inline bool iwl_mvm_is_regular_scan(struct iwl_mvm_scan_params *params)
 758 {
 759         return params->n_scan_plans == 1 &&
 760                 params->scan_plans[0].iterations == 1;
 761 }
 762
 763 static int iwl_mvm_scan_lmac_flags(struct iwl_mvm *mvm,
 764                                    struct iwl_mvm_scan_params *params,
 765                                    struct ieee80211_vif *vif)
 766 {
 767         int flags = 0;
 768
 769         if (params->n_ssids == 0)
 770                 flags |= IWL_MVM_LMAC_SCAN_FLAG_PASSIVE;
 771
 772         if (params->n_ssids == 1 && params->ssids[0].ssid_len != 0)
 773                 flags |= IWL_MVM_LMAC_SCAN_FLAG_PRE_CONNECTION;
 774
 775         if (params->type == IWL_SCAN_TYPE_FRAGMENTED)
 776                 flags |= IWL_MVM_LMAC_SCAN_FLAG_FRAGMENTED;
 777
 778         if (iwl_mvm_rrm_scan_needed(mvm))
 779                 flags |= IWL_MVM_LMAC_SCAN_FLAGS_RRM_ENABLED;
 780
 781         if (params->pass_all)
 782                 flags |= IWL_MVM_LMAC_SCAN_FLAG_PASS_ALL;
 783         else
 784                 flags |= IWL_MVM_LMAC_SCAN_FLAG_MATCH;
 785
 786 #ifdef CONFIG_IWLWIFI_DEBUGFS
 787         if (mvm->scan_iter_notif_enabled)
 788                 flags |= IWL_MVM_LMAC_SCAN_FLAG_ITER_COMPLETE;
 789 #endif
 790
 791         if (iwl_mvm_is_regular_scan(params) &&
 792             vif->type != NL80211_IFTYPE_P2P_DEVICE &&
 793             params->type != IWL_SCAN_TYPE_FRAGMENTED)
 794                 flags |= IWL_MVM_LMAC_SCAN_FLAG_EXTENDED_DWELL;
 795
 796         return flags;
 797 }
 798
 799 static int iwl_mvm_scan_lmac(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 800                              struct iwl_mvm_scan_params *params)
 801 {
 802         struct iwl_scan_req_lmac *cmd = mvm->scan_cmd;
 803         struct iwl_scan_probe_req *preq =
 804                 (void *)(cmd->data + sizeof(struct iwl_scan_channel_cfg_lmac) *
 805                          mvm->fw->ucode_capa.n_scan_channels);
 806         u32 ssid_bitmap = 0;
 807         int i;
 808
 809         lockdep_assert_held(&mvm->mutex);
 810
 811         memset(cmd, 0, ksize(cmd));
 812
 813         if (WARN_ON(params->n_scan_plans > IWL_MAX_SCHED_SCAN_PLANS))
 814                 return -EINVAL;
 815
 816         iwl_mvm_scan_lmac_dwell(mvm, cmd, params);
 817
 818         cmd->rx_chain_select = iwl_mvm_scan_rx_chain(mvm);
 819         cmd->iter_num = cpu_to_le32(1);
 820         cmd->n_channels = (u8)params->n_channels;
 821
 822         cmd->delay = cpu_to_le32(params->delay);
 823
 824         cmd->scan_flags = cpu_to_le32(iwl_mvm_scan_lmac_flags(mvm, params,
 825                                                               vif));
 826
 827         cmd->flags = iwl_mvm_scan_rxon_flags(params->channels[0]->band);
 828         cmd->filter_flags = cpu_to_le32(MAC_FILTER_ACCEPT_GRP |
 829                                         MAC_FILTER_IN_BEACON);
 830         iwl_mvm_scan_fill_tx_cmd(mvm, cmd->tx_cmd, params->no_cck);
 831         iwl_scan_build_ssids(params, cmd->direct_scan, &ssid_bitmap);
 832
 833         /* this API uses bits 1-20 instead of 0-19 */
 834         ssid_bitmap <<= 1;
 835
 836         for (i = 0; i < params->n_scan_plans; i++) {
 837                 struct cfg80211_sched_scan_plan *scan_plan =
 838                         &params->scan_plans[i];
 839
 840                 cmd->schedule[i].delay =
 841                         cpu_to_le16(scan_plan->interval);
 842                 cmd->schedule[i].iterations = scan_plan->iterations;
 843                 cmd->schedule[i].full_scan_mul = 1;
 844         }
 845
 846         /*
 847          * If the number of iterations of the last scan plan is set to
 848          * zero, it should run infinitely. However, this is not always the case.
 849          * For example, when regular scan is requested the driver sets one scan
 850          * plan with one iteration.
 851          */
 852         if (!cmd->schedule[i - 1].iterations)
 853                 cmd->schedule[i - 1].iterations = 0xff;
 854
 855         if (iwl_mvm_scan_use_ebs(mvm, vif)) {
 856                 cmd->channel_opt[0].flags =
 857                         cpu_to_le16(IWL_SCAN_CHANNEL_FLAG_EBS |
 858                                     IWL_SCAN_CHANNEL_FLAG_EBS_ACCURATE |
 859                                     IWL_SCAN_CHANNEL_FLAG_CACHE_ADD);
 860                 cmd->channel_opt[0].non_ebs_ratio =
 861                         cpu_to_le16(IWL_DENSE_EBS_SCAN_RATIO);
 862                 cmd->channel_opt[1].flags =
 863                         cpu_to_le16(IWL_SCAN_CHANNEL_FLAG_EBS |
 864                                     IWL_SCAN_CHANNEL_FLAG_EBS_ACCURATE |
 865                                     IWL_SCAN_CHANNEL_FLAG_CACHE_ADD);
 866                 cmd->channel_opt[1].non_ebs_ratio =
 867                         cpu_to_le16(IWL_SPARSE_EBS_SCAN_RATIO);
 868         }
 869
 870         iwl_mvm_lmac_scan_cfg_channels(mvm, params->channels,
 871                                        params->n_channels, ssid_bitmap, cmd);
 872
 873         *preq = params->preq;
 874
 875         return 0;
 876 }
 877
 878 static int rate_to_scan_rate_flag(unsigned int rate)
 879 {
 880         static const int rate_to_scan_rate[IWL_RATE_COUNT] = {
 881                 [IWL_RATE_1M_INDEX]     = SCAN_CONFIG_RATE_1M,
 882                 [IWL_RATE_2M_INDEX]     = SCAN_CONFIG_RATE_2M,
 883                 [IWL_RATE_5M_INDEX]     = SCAN_CONFIG_RATE_5M,
 884                 [IWL_RATE_11M_INDEX]    = SCAN_CONFIG_RATE_11M,
 885                 [IWL_RATE_6M_INDEX]     = SCAN_CONFIG_RATE_6M,
 886                 [IWL_RATE_9M_INDEX]     = SCAN_CONFIG_RATE_9M,
 887                 [IWL_RATE_12M_INDEX]    = SCAN_CONFIG_RATE_12M,
 888                 [IWL_RATE_18M_INDEX]    = SCAN_CONFIG_RATE_18M,
 889                 [IWL_RATE_24M_INDEX]    = SCAN_CONFIG_RATE_24M,
 890                 [IWL_RATE_36M_INDEX]    = SCAN_CONFIG_RATE_36M,
 891                 [IWL_RATE_48M_INDEX]    = SCAN_CONFIG_RATE_48M,
 892                 [IWL_RATE_54M_INDEX]    = SCAN_CONFIG_RATE_54M,
 893         };
 894
 895         return rate_to_scan_rate[rate];
 896 }
 897
 898 static __le32 iwl_mvm_scan_config_rates(struct iwl_mvm *mvm)
 899 {
 900         struct ieee80211_supported_band *band;
 901         unsigned int rates = 0;
 902         int i;
 903
 904         band = &mvm->nvm_data->bands[IEEE80211_BAND_2GHZ];
 905         for (i = 0; i < band->n_bitrates; i++)
 906                 rates |= rate_to_scan_rate_flag(band->bitrates[i].hw_value);
 907         band = &mvm->nvm_data->bands[IEEE80211_BAND_5GHZ];
 908         for (i = 0; i < band->n_bitrates; i++)
 909                 rates |= rate_to_scan_rate_flag(band->bitrates[i].hw_value);
 910
 911         /* Set both basic rates and supported rates */
 912         rates |= SCAN_CONFIG_SUPPORTED_RATE(rates);
 913
 914         return cpu_to_le32(rates);
 915 }
 916
 917 int iwl_mvm_config_scan(struct iwl_mvm *mvm)
 918 {
 919         struct iwl_scan_config *scan_config;
 920         struct ieee80211_supported_band *band;
 921         int num_channels =
 922                 mvm->nvm_data->bands[IEEE80211_BAND_2GHZ].n_channels +
 923                 mvm->nvm_data->bands[IEEE80211_BAND_5GHZ].n_channels;
 924         int ret, i, j = 0, cmd_size;
 925         struct iwl_host_cmd cmd = {
 926                 .id = iwl_cmd_id(SCAN_CFG_CMD, IWL_ALWAYS_LONG_GROUP, 0),
 927         };
 928         enum iwl_mvm_scan_type type = iwl_mvm_get_scan_type(mvm, false);
 929
 930         if (WARN_ON(num_channels > mvm->fw->ucode_capa.n_scan_channels))
 931                 return -ENOBUFS;
 932
 933         if (type == mvm->scan_type)
 934                 return 0;
 935
 936         cmd_size = sizeof(*scan_config) + mvm->fw->ucode_capa.n_scan_channels;
 937
 938         scan_config = kzalloc(cmd_size, GFP_KERNEL);
 939         if (!scan_config)
 940                 return -ENOMEM;
 941
 942         scan_config->flags = cpu_to_le32(SCAN_CONFIG_FLAG_ACTIVATE |
 943                                          SCAN_CONFIG_FLAG_ALLOW_CHUB_REQS |
 944                                          SCAN_CONFIG_FLAG_SET_TX_CHAINS |
 945                                          SCAN_CONFIG_FLAG_SET_RX_CHAINS |
 946                                          SCAN_CONFIG_FLAG_SET_ALL_TIMES |
 947                                          SCAN_CONFIG_FLAG_SET_LEGACY_RATES |
 948                                          SCAN_CONFIG_FLAG_SET_MAC_ADDR |
 949                                          SCAN_CONFIG_FLAG_SET_CHANNEL_FLAGS|
 950                                          SCAN_CONFIG_N_CHANNELS(num_channels) |
 951                                          (type == IWL_SCAN_TYPE_FRAGMENTED ?
 952                                           SCAN_CONFIG_FLAG_SET_FRAGMENTED :
 953                                           SCAN_CONFIG_FLAG_CLEAR_FRAGMENTED));
 954         scan_config->tx_chains = cpu_to_le32(iwl_mvm_get_valid_tx_ant(mvm));
 955         scan_config->rx_chains = cpu_to_le32(iwl_mvm_scan_rx_ant(mvm));
 956         scan_config->legacy_rates = iwl_mvm_scan_config_rates(mvm);
 957         scan_config->out_of_channel_time =
 958                 cpu_to_le32(scan_timing[type].max_out_time);
 959         scan_config->suspend_time = cpu_to_le32(scan_timing[type].suspend_time);
 960         scan_config->dwell_active = scan_timing[type].dwell_active;
 961         scan_config->dwell_passive = scan_timing[type].dwell_passive;
 962         scan_config->dwell_fragmented = scan_timing[type].dwell_fragmented;
 963         scan_config->dwell_extended = scan_timing[type].dwell_extended;
 964
 965         memcpy(&scan_config->mac_addr, &mvm->addresses[0].addr, ETH_ALEN);
 966
 967         scan_config->bcast_sta_id = mvm->aux_sta.sta_id;
 968         scan_config->channel_flags = IWL_CHANNEL_FLAG_EBS |
 969                                      IWL_CHANNEL_FLAG_ACCURATE_EBS |
 970                                      IWL_CHANNEL_FLAG_EBS_ADD |
 971                                      IWL_CHANNEL_FLAG_PRE_SCAN_PASSIVE2ACTIVE;
 972
 973         band = &mvm->nvm_data->bands[IEEE80211_BAND_2GHZ];
 974         for (i = 0; i < band->n_channels; i++, j++)
 975                 scan_config->channel_array[j] = band->channels[i].hw_value;
 976         band = &mvm->nvm_data->bands[IEEE80211_BAND_5GHZ];
 977         for (i = 0; i < band->n_channels; i++, j++)
 978                 scan_config->channel_array[j] = band->channels[i].hw_value;
 979
 980         cmd.data[0] = scan_config;
 981         cmd.len[0] = cmd_size;
 982         cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
 983
 984         IWL_DEBUG_SCAN(mvm, "Sending UMAC scan config\n");
 985
 986         ret = iwl_mvm_send_cmd(mvm, &cmd);
 987         if (!ret)
 988                 mvm->scan_type = type;
 989
 990         kfree(scan_config);
 991         return ret;
 992 }
 993
 994 static int iwl_mvm_scan_uid_by_status(struct iwl_mvm *mvm, int status)
 995 {
 996         int i;
 997
 998         for (i = 0; i < mvm->max_scans; i++)
 999                 if (mvm->scan_uid_status[i] == status)
1000                         return i;
1001
1002         return -ENOENT;
1003 }
1004
1005 static void iwl_mvm_scan_umac_dwell(struct iwl_mvm *mvm,
1006                                     struct iwl_scan_req_umac *cmd,
1007                                     struct iwl_mvm_scan_params *params)
1008 {
1009         cmd->extended_dwell = scan_timing[params->type].dwell_extended;
1010         cmd->active_dwell = scan_timing[params->type].dwell_active;
1011         cmd->passive_dwell = scan_timing[params->type].dwell_passive;
1012         cmd->fragmented_dwell = scan_timing[params->type].dwell_fragmented;
1013         cmd->max_out_time = cpu_to_le32(scan_timing[params->type].max_out_time);
1014         cmd->suspend_time = cpu_to_le32(scan_timing[params->type].suspend_time);
1015         cmd->scan_priority =
1016                 iwl_mvm_scan_priority(mvm, IWL_SCAN_PRIORITY_EXT_6);
1017
1018         if (iwl_mvm_is_regular_scan(params))
1019                 cmd->ooc_priority =
1020                         iwl_mvm_scan_priority(mvm, IWL_SCAN_PRIORITY_EXT_6);
1021         else
1022                 cmd->ooc_priority =
1023                         iwl_mvm_scan_priority(mvm, IWL_SCAN_PRIORITY_EXT_2);
1024 }
1025
1026 static void
1027 iwl_mvm_umac_scan_cfg_channels(struct iwl_mvm *mvm,
1028                                struct ieee80211_channel **channels,
1029                                int n_channels, u32 ssid_bitmap,
1030                                struct iwl_scan_req_umac *cmd)
1031 {
1032         struct iwl_scan_channel_cfg_umac *channel_cfg = (void *)&cmd->data;
1033         int i;
1034
1035         for (i = 0; i < n_channels; i++) {
1036                 channel_cfg[i].flags = cpu_to_le32(ssid_bitmap);
1037                 channel_cfg[i].channel_num = channels[i]->hw_value;
1038                 channel_cfg[i].iter_count = 1;
1039                 channel_cfg[i].iter_interval = 0;
1040         }
1041 }
1042
1043 static u32 iwl_mvm_scan_umac_flags(struct iwl_mvm *mvm,
1044                                    struct iwl_mvm_scan_params *params,
1045                                    struct ieee80211_vif *vif)
1046 {
1047         int flags = 0;
1048
1049         if (params->n_ssids == 0)
1050                 flags = IWL_UMAC_SCAN_GEN_FLAGS_PASSIVE;
1051
1052         if (params->n_ssids == 1 && params->ssids[0].ssid_len != 0)
1053                 flags |= IWL_UMAC_SCAN_GEN_FLAGS_PRE_CONNECT;
1054
1055         if (params->type == IWL_SCAN_TYPE_FRAGMENTED)
1056                 flags |= IWL_UMAC_SCAN_GEN_FLAGS_FRAGMENTED;
1057
1058         if (iwl_mvm_rrm_scan_needed(mvm))
1059                 flags |= IWL_UMAC_SCAN_GEN_FLAGS_RRM_ENABLED;
1060
1061         if (params->pass_all)
1062                 flags |= IWL_UMAC_SCAN_GEN_FLAGS_PASS_ALL;
1063         else
1064                 flags |= IWL_UMAC_SCAN_GEN_FLAGS_MATCH;
1065
1066         if (!iwl_mvm_is_regular_scan(params))
1067                 flags |= IWL_UMAC_SCAN_GEN_FLAGS_PERIODIC;
1068
1069 #ifdef CONFIG_IWLWIFI_DEBUGFS
1070         if (mvm->scan_iter_notif_enabled)
1071                 flags |= IWL_UMAC_SCAN_GEN_FLAGS_ITER_COMPLETE;
1072 #endif
1073
1074         if (iwl_mvm_is_regular_scan(params) &&
1075             vif->type != NL80211_IFTYPE_P2P_DEVICE &&
1076             params->type != IWL_SCAN_TYPE_FRAGMENTED)
1077                 flags |= IWL_UMAC_SCAN_GEN_FLAGS_EXTENDED_DWELL;
1078
1079         return flags;
1080 }
1081
1082 static int iwl_mvm_scan_umac(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1083                              struct iwl_mvm_scan_params *params,
1084                              int type)
1085 {
1086         struct iwl_scan_req_umac *cmd = mvm->scan_cmd;
1087         struct iwl_scan_req_umac_tail *sec_part = (void *)&cmd->data +
1088                 sizeof(struct iwl_scan_channel_cfg_umac) *
1089                         mvm->fw->ucode_capa.n_scan_channels;
1090         int uid, i;
1091         u32 ssid_bitmap = 0;
1092
1093         lockdep_assert_held(&mvm->mutex);
1094
1095         if (WARN_ON(params->n_scan_plans > IWL_MAX_SCHED_SCAN_PLANS))
1096                 return -EINVAL;
1097
1098         uid = iwl_mvm_scan_uid_by_status(mvm, 0);
1099         if (uid < 0)
1100                 return uid;
1101
1102         memset(cmd, 0, ksize(cmd));
1103
1104         iwl_mvm_scan_umac_dwell(mvm, cmd, params);
1105
1106         mvm->scan_uid_status[uid] = type;
1107
1108         cmd->uid = cpu_to_le32(uid);
1109         cmd->general_flags = cpu_to_le32(iwl_mvm_scan_umac_flags(mvm, params,
1110                                                                  vif));
1111
1112         if (type == IWL_MVM_SCAN_SCHED)
1113                 cmd->flags = cpu_to_le32(IWL_UMAC_SCAN_FLAG_PREEMPTIVE);
1114
1115         if (iwl_mvm_scan_use_ebs(mvm, vif))
1116                 cmd->channel_flags = IWL_SCAN_CHANNEL_FLAG_EBS |
1117                                      IWL_SCAN_CHANNEL_FLAG_EBS_ACCURATE |
1118                                      IWL_SCAN_CHANNEL_FLAG_CACHE_ADD;
1119
1120         cmd->n_channels = params->n_channels;
1121
1122         iwl_scan_build_ssids(params, sec_part->direct_scan, &ssid_bitmap);
1123
1124         iwl_mvm_umac_scan_cfg_channels(mvm, params->channels,
1125                                        params->n_channels, ssid_bitmap, cmd);
1126
1127         for (i = 0; i < params->n_scan_plans; i++) {
1128                 struct cfg80211_sched_scan_plan *scan_plan =
1129                         &params->scan_plans[i];
1130
1131                 sec_part->schedule[i].iter_count = scan_plan->iterations;
1132                 sec_part->schedule[i].interval =
1133                         cpu_to_le16(scan_plan->interval);
1134         }
1135
1136         /*
1137          * If the number of iterations of the last scan plan is set to
1138          * zero, it should run infinitely. However, this is not always the case.
1139          * For example, when regular scan is requested the driver sets one scan
1140          * plan with one iteration.
1141          */
1142         if (!sec_part->schedule[i - 1].iter_count)
1143                 sec_part->schedule[i - 1].iter_count = 0xff;
1144
1145         sec_part->delay = cpu_to_le16(params->delay);
1146         sec_part->preq = params->preq;
1147
1148         return 0;
1149 }
1150
1151 static int iwl_mvm_num_scans(struct iwl_mvm *mvm)
1152 {
1153         return hweight32(mvm->scan_status & IWL_MVM_SCAN_MASK);
1154 }
1155
1156 static int iwl_mvm_check_running_scans(struct iwl_mvm *mvm, int type)
1157 {
1158         /* This looks a bit arbitrary, but the idea is that if we run
1159          * out of possible simultaneous scans and the userspace is
1160          * trying to run a scan type that is already running, we
1161          * return -EBUSY.  But if the userspace wants to start a
1162          * different type of scan, we stop the opposite type to make
1163          * space for the new request.  The reason is backwards
1164          * compatibility with old wpa_supplicant that wouldn't stop a
1165          * scheduled scan before starting a normal scan.
1166          */
1167
1168         if (iwl_mvm_num_scans(mvm) < mvm->max_scans)
1169                 return 0;
1170
1171         /* Use a switch, even though this is a bitmask, so that more
1172          * than one bits set will fall in default and we will warn.
1173          */
1174         switch (type) {
1175         case IWL_MVM_SCAN_REGULAR:
1176                 if (mvm->scan_status & IWL_MVM_SCAN_REGULAR_MASK)
1177                         return -EBUSY;
1178                 return iwl_mvm_scan_stop(mvm, IWL_MVM_SCAN_SCHED, true);
1179         case IWL_MVM_SCAN_SCHED:
1180                 if (mvm->scan_status & IWL_MVM_SCAN_SCHED_MASK)
1181                         return -EBUSY;
1182                 return iwl_mvm_scan_stop(mvm, IWL_MVM_SCAN_REGULAR, true);
1183         case IWL_MVM_SCAN_NETDETECT:
1184                 /* No need to stop anything for net-detect since the
1185                  * firmware is restarted anyway.  This way, any sched
1186                  * scans that were running will be restarted when we
1187                  * resume.
1188                 */
1189                 return 0;
1190         default:
1191                 WARN_ON(1);
1192                 break;
1193         }
1194
1195         return -EIO;
1196 }
1197
1198 int iwl_mvm_reg_scan_start(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1199                            struct cfg80211_scan_request *req,
1200                            struct ieee80211_scan_ies *ies)
1201 {
1202         struct iwl_host_cmd hcmd = {
1203                 .len = { iwl_mvm_scan_size(mvm), },
1204                 .data = { mvm->scan_cmd, },
1205                 .dataflags = { IWL_HCMD_DFL_NOCOPY, },
1206         };
1207         struct iwl_mvm_scan_params params = {};
1208         int ret;
1209         struct cfg80211_sched_scan_plan scan_plan = { .iterations = 1 };
1210
1211         lockdep_assert_held(&mvm->mutex);
1212
1213         if (iwl_mvm_is_lar_supported(mvm) && !mvm->lar_regdom_set) {
1214                 IWL_ERR(mvm, "scan while LAR regdomain is not set\n");
1215                 return -EBUSY;
1216         }
1217
1218         ret = iwl_mvm_check_running_scans(mvm, IWL_MVM_SCAN_REGULAR);
1219         if (ret)
1220                 return ret;
1221
1222         /* we should have failed registration if scan_cmd was NULL */
1223         if (WARN_ON(!mvm->scan_cmd))
1224                 return -ENOMEM;
1225
1226         if (!iwl_mvm_scan_fits(mvm, req->n_ssids, ies, req->n_channels))
1227                 return -ENOBUFS;
1228
1229         params.n_ssids = req->n_ssids;
1230         params.flags = req->flags;
1231         params.n_channels = req->n_channels;
1232         params.delay = 0;
1233         params.ssids = req->ssids;
1234         params.channels = req->channels;
1235         params.mac_addr = req->mac_addr;
1236         params.mac_addr_mask = req->mac_addr_mask;
1237         params.no_cck = req->no_cck;
1238         params.pass_all = true;
1239         params.n_match_sets = 0;
1240         params.match_sets = NULL;
1241
1242         params.scan_plans = &scan_plan;
1243         params.n_scan_plans = 1;
1244
1245         params.type =
1246                 iwl_mvm_get_scan_type(mvm,
1247                                       vif->type == NL80211_IFTYPE_P2P_DEVICE);
1248
1249         iwl_mvm_build_scan_probe(mvm, vif, ies, &params);
1250
1251         if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_UMAC_SCAN)) {
1252                 hcmd.id = iwl_cmd_id(SCAN_REQ_UMAC, IWL_ALWAYS_LONG_GROUP, 0);
1253                 ret = iwl_mvm_scan_umac(mvm, vif, &params,
1254                                         IWL_MVM_SCAN_REGULAR);
1255         } else {
1256                 hcmd.id = SCAN_OFFLOAD_REQUEST_CMD;
1257                 ret = iwl_mvm_scan_lmac(mvm, vif, &params);
1258         }
1259
1260         if (ret)
1261                 return ret;
1262
1263         ret = iwl_mvm_send_cmd(mvm, &hcmd);
1264         if (ret) {
1265                 /* If the scan failed, it usually means that the FW was unable
1266                  * to allocate the time events. Warn on it, but maybe we
1267                  * should try to send the command again with different params.
1268                  */
1269                 IWL_ERR(mvm, "Scan failed! ret %d\n", ret);
1270                 return ret;
1271         }
1272
1273         IWL_DEBUG_SCAN(mvm, "Scan request was sent successfully\n");
1274         mvm->scan_status |= IWL_MVM_SCAN_REGULAR;
1275         iwl_mvm_ref(mvm, IWL_MVM_REF_SCAN);
1276
1277         return 0;
1278 }
1279
1280 int iwl_mvm_sched_scan_start(struct iwl_mvm *mvm,
1281                              struct ieee80211_vif *vif,
1282                              struct cfg80211_sched_scan_request *req,
1283                              struct ieee80211_scan_ies *ies,
1284                              int type)
1285 {
1286         struct iwl_host_cmd hcmd = {
1287                 .len = { iwl_mvm_scan_size(mvm), },
1288                 .data = { mvm->scan_cmd, },
1289                 .dataflags = { IWL_HCMD_DFL_NOCOPY, },
1290         };
1291         struct iwl_mvm_scan_params params = {};
1292         int ret;
1293
1294         lockdep_assert_held(&mvm->mutex);
1295
1296         if (iwl_mvm_is_lar_supported(mvm) && !mvm->lar_regdom_set) {
1297                 IWL_ERR(mvm, "sched-scan while LAR regdomain is not set\n");
1298                 return -EBUSY;
1299         }
1300
1301         /* we don't support "match all" in the firmware */
1302         if (!req->n_match_sets)
1303                 return -EOPNOTSUPP;
1304
1305         ret = iwl_mvm_check_running_scans(mvm, type);
1306         if (ret)
1307                 return ret;
1308
1309         /* we should have failed registration if scan_cmd was NULL */
1310         if (WARN_ON(!mvm->scan_cmd))
1311                 return -ENOMEM;
1312
1313         if (!iwl_mvm_scan_fits(mvm, req->n_ssids, ies, req->n_channels))
1314                 return -ENOBUFS;
1315
1316         params.n_ssids = req->n_ssids;
1317         params.flags = req->flags;
1318         params.n_channels = req->n_channels;
1319         params.ssids = req->ssids;
1320         params.channels = req->channels;
1321         params.mac_addr = req->mac_addr;
1322         params.mac_addr_mask = req->mac_addr_mask;
1323         params.no_cck = false;
1324         params.pass_all =  iwl_mvm_scan_pass_all(mvm, req);
1325         params.n_match_sets = req->n_match_sets;
1326         params.match_sets = req->match_sets;
1327         if (!req->n_scan_plans)
1328                 return -EINVAL;
1329
1330         params.n_scan_plans = req->n_scan_plans;
1331         params.scan_plans = req->scan_plans;
1332
1333         params.type =
1334                 iwl_mvm_get_scan_type(mvm,
1335                                       vif->type == NL80211_IFTYPE_P2P_DEVICE);
1336
1337         /* In theory, LMAC scans can handle a 32-bit delay, but since
1338          * waiting for over 18 hours to start the scan is a bit silly
1339          * and to keep it aligned with UMAC scans (which only support
1340          * 16-bit delays), trim it down to 16-bits.
1341          */
1342         if (req->delay > U16_MAX) {
1343                 IWL_DEBUG_SCAN(mvm,
1344                                "delay value is > 16-bits, set to max possible\n");
1345                 params.delay = U16_MAX;
1346         } else {
1347                 params.delay = req->delay;
1348         }
1349
1350         ret = iwl_mvm_config_sched_scan_profiles(mvm, req);
1351         if (ret)
1352                 return ret;
1353
1354         iwl_mvm_build_scan_probe(mvm, vif, ies, &params);
1355
1356         if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_UMAC_SCAN)) {
1357                 hcmd.id = iwl_cmd_id(SCAN_REQ_UMAC, IWL_ALWAYS_LONG_GROUP, 0);
1358                 ret = iwl_mvm_scan_umac(mvm, vif, &params, IWL_MVM_SCAN_SCHED);
1359         } else {
1360                 hcmd.id = SCAN_OFFLOAD_REQUEST_CMD;
1361                 ret = iwl_mvm_scan_lmac(mvm, vif, &params);
1362         }
1363
1364         if (ret)
1365                 return ret;
1366
1367         ret = iwl_mvm_send_cmd(mvm, &hcmd);
1368         if (!ret) {
1369                 IWL_DEBUG_SCAN(mvm,
1370                                "Sched scan request was sent successfully\n");
1371                 mvm->scan_status |= type;
1372         } else {
1373                 /* If the scan failed, it usually means that the FW was unable
1374                  * to allocate the time events. Warn on it, but maybe we
1375                  * should try to send the command again with different params.
1376                  */
1377                 IWL_ERR(mvm, "Sched scan failed! ret %d\n", ret);
1378         }
1379
1380         return ret;
1381 }
1382
1383 void iwl_mvm_rx_umac_scan_complete_notif(struct iwl_mvm *mvm,
1384                                          struct iwl_rx_cmd_buffer *rxb)
1385 {
1386         struct iwl_rx_packet *pkt = rxb_addr(rxb);
1387         struct iwl_umac_scan_complete *notif = (void *)pkt->data;
1388         u32 uid = __le32_to_cpu(notif->uid);
1389         bool aborted = (notif->status == IWL_SCAN_OFFLOAD_ABORTED);
1390
1391         if (WARN_ON(!(mvm->scan_uid_status[uid] & mvm->scan_status)))
1392                 return;
1393
1394         /* if the scan is already stopping, we don't need to notify mac80211 */
1395         if (mvm->scan_uid_status[uid] == IWL_MVM_SCAN_REGULAR) {
1396                 ieee80211_scan_completed(mvm->hw, aborted);
1397                 iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
1398         } else if (mvm->scan_uid_status[uid] == IWL_MVM_SCAN_SCHED) {
1399                 ieee80211_sched_scan_stopped(mvm->hw);
1400         }
1401
1402         mvm->scan_status &= ~mvm->scan_uid_status[uid];
1403         IWL_DEBUG_SCAN(mvm,
1404                        "Scan completed, uid %u type %u, status %s, EBS status %s\n",
1405                        uid, mvm->scan_uid_status[uid],
1406                        notif->status == IWL_SCAN_OFFLOAD_COMPLETED ?
1407                                 "completed" : "aborted",
1408                        iwl_mvm_ebs_status_str(notif->ebs_status));
1409         IWL_DEBUG_SCAN(mvm,
1410                        "Last line %d, Last iteration %d, Time from last iteration %d\n",
1411                        notif->last_schedule, notif->last_iter,
1412                        __le32_to_cpu(notif->time_from_last_iter));
1413
1414         if (notif->ebs_status != IWL_SCAN_EBS_SUCCESS &&
1415             notif->ebs_status != IWL_SCAN_EBS_INACTIVE)
1416                 mvm->last_ebs_successful = false;
1417
1418         mvm->scan_uid_status[uid] = 0;
1419 }
1420
1421 void iwl_mvm_rx_umac_scan_iter_complete_notif(struct iwl_mvm *mvm,
1422                                               struct iwl_rx_cmd_buffer *rxb)
1423 {
1424         struct iwl_rx_packet *pkt = rxb_addr(rxb);
1425         struct iwl_umac_scan_iter_complete_notif *notif = (void *)pkt->data;
1426         u8 buf[256];
1427
1428         IWL_DEBUG_SCAN(mvm,
1429                        "UMAC Scan iteration complete: status=0x%x scanned_channels=%d channels list: %s\n",
1430                        notif->status, notif->scanned_channels,
1431                        iwl_mvm_dump_channel_list(notif->results,
1432                                                  notif->scanned_channels, buf,
1433                                                  sizeof(buf)));
1434 }
1435
1436 static int iwl_mvm_umac_scan_abort(struct iwl_mvm *mvm, int type)
1437 {
1438         struct iwl_umac_scan_abort cmd = {};
1439         int uid, ret;
1440
1441         lockdep_assert_held(&mvm->mutex);
1442
1443         /* We should always get a valid index here, because we already
1444          * checked that this type of scan was running in the generic
1445          * code.
1446          */
1447         uid = iwl_mvm_scan_uid_by_status(mvm, type);
1448         if (WARN_ON_ONCE(uid < 0))
1449                 return uid;
1450
1451         cmd.uid = cpu_to_le32(uid);
1452
1453         IWL_DEBUG_SCAN(mvm, "Sending scan abort, uid %u\n", uid);
1454
1455         ret = iwl_mvm_send_cmd_pdu(mvm,
1456                                    iwl_cmd_id(SCAN_ABORT_UMAC,
1457                                               IWL_ALWAYS_LONG_GROUP, 0),
1458                                    0, sizeof(cmd), &cmd);
1459         if (!ret)
1460                 mvm->scan_uid_status[uid] = type << IWL_MVM_SCAN_STOPPING_SHIFT;
1461
1462         return ret;
1463 }
1464
1465 static int iwl_mvm_scan_stop_wait(struct iwl_mvm *mvm, int type)
1466 {
1467         struct iwl_notification_wait wait_scan_done;
1468         static const u16 scan_done_notif[] = { SCAN_COMPLETE_UMAC,
1469                                               SCAN_OFFLOAD_COMPLETE, };
1470         int ret;
1471
1472         lockdep_assert_held(&mvm->mutex);
1473
1474         iwl_init_notification_wait(&mvm->notif_wait, &wait_scan_done,
1475                                    scan_done_notif,
1476                                    ARRAY_SIZE(scan_done_notif),
1477                                    NULL, NULL);
1478
1479         IWL_DEBUG_SCAN(mvm, "Preparing to stop scan, type %x\n", type);
1480
1481         if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_UMAC_SCAN))
1482                 ret = iwl_mvm_umac_scan_abort(mvm, type);
1483         else
1484                 ret = iwl_mvm_lmac_scan_abort(mvm);
1485
1486         if (ret) {
1487                 IWL_DEBUG_SCAN(mvm, "couldn't stop scan type %d\n", type);
1488                 iwl_remove_notification(&mvm->notif_wait, &wait_scan_done);
1489                 return ret;
1490         }
1491
1492         ret = iwl_wait_notification(&mvm->notif_wait, &wait_scan_done, 1 * HZ);
1493
1494         return ret;
1495 }
1496
1497 int iwl_mvm_scan_size(struct iwl_mvm *mvm)
1498 {
1499         if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_UMAC_SCAN))
1500                 return sizeof(struct iwl_scan_req_umac) +
1501                         sizeof(struct iwl_scan_channel_cfg_umac) *
1502                                 mvm->fw->ucode_capa.n_scan_channels +
1503                         sizeof(struct iwl_scan_req_umac_tail);
1504
1505         return sizeof(struct iwl_scan_req_lmac) +
1506                 sizeof(struct iwl_scan_channel_cfg_lmac) *
1507                 mvm->fw->ucode_capa.n_scan_channels +
1508                 sizeof(struct iwl_scan_probe_req);
1509 }
1510
1511 /*
1512  * This function is used in nic restart flow, to inform mac80211 about scans
1513  * that was aborted by restart flow or by an assert.
1514  */
1515 void iwl_mvm_report_scan_aborted(struct iwl_mvm *mvm)
1516 {
1517         if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_UMAC_SCAN)) {
1518                 int uid, i;
1519
1520                 uid = iwl_mvm_scan_uid_by_status(mvm, IWL_MVM_SCAN_REGULAR);
1521                 if (uid >= 0) {
1522                         ieee80211_scan_completed(mvm->hw, true);
1523                         mvm->scan_uid_status[uid] = 0;
1524                 }
1525                 uid = iwl_mvm_scan_uid_by_status(mvm, IWL_MVM_SCAN_SCHED);
1526                 if (uid >= 0 && !mvm->restart_fw) {
1527                         ieee80211_sched_scan_stopped(mvm->hw);
1528                         mvm->scan_uid_status[uid] = 0;
1529                 }
1530
1531                 /* We shouldn't have any UIDs still set.  Loop over all the
1532                  * UIDs to make sure there's nothing left there and warn if
1533                  * any is found.
1534                  */
1535                 for (i = 0; i < mvm->max_scans; i++) {
1536                         if (WARN_ONCE(mvm->scan_uid_status[i],
1537                                       "UMAC scan UID %d status was not cleaned\n",
1538                                       i))
1539                                 mvm->scan_uid_status[i] = 0;
1540                 }
1541         } else {
1542                 if (mvm->scan_status & IWL_MVM_SCAN_REGULAR)
1543                         ieee80211_scan_completed(mvm->hw, true);
1544
1545                 /* Sched scan will be restarted by mac80211 in
1546                  * restart_hw, so do not report if FW is about to be
1547                  * restarted.
1548                  */
1549                 if ((mvm->scan_status & IWL_MVM_SCAN_SCHED) && !mvm->restart_fw)
1550                         ieee80211_sched_scan_stopped(mvm->hw);
1551         }
1552 }
1553
1554 int iwl_mvm_scan_stop(struct iwl_mvm *mvm, int type, bool notify)
1555 {
1556         int ret;
1557
1558         if (!(mvm->scan_status & type))
1559                 return 0;
1560
1561         if (iwl_mvm_is_radio_killed(mvm)) {
1562                 ret = 0;
1563                 goto out;
1564         }
1565
1566         ret = iwl_mvm_scan_stop_wait(mvm, type);
1567         if (!ret)
1568                 mvm->scan_status |= type << IWL_MVM_SCAN_STOPPING_SHIFT;
1569 out:
1570         /* Clear the scan status so the next scan requests will
1571          * succeed and mark the scan as stopping, so that the Rx
1572          * handler doesn't do anything, as the scan was stopped from
1573          * above.
1574          */
1575         mvm->scan_status &= ~type;
1576
1577         if (type == IWL_MVM_SCAN_REGULAR) {
1578                 /* Since the rx handler won't do anything now, we have
1579                  * to release the scan reference here.
1580                  */
1581                 iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
1582                 if (notify)
1583                         ieee80211_scan_completed(mvm->hw, true);
1584         } else if (notify) {
1585                 ieee80211_sched_scan_stopped(mvm->hw);
1586         }
1587
1588         return ret;
1589 }