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