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

   1 /******************************************************************************
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  54  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  62  *****************************************************************************/
  63
  64 #include <linux/etherdevice.h>
  65 #include <net/mac80211.h>
  66
  67 #include "mvm.h"
  68 #include "iwl-eeprom-parse.h"
  69 #include "fw-api-scan.h"
  70
  71 #define IWL_PLCP_QUIET_THRESH 1
  72 #define IWL_ACTIVE_QUIET_TIME 10
  73
  74 struct iwl_mvm_scan_params {
  75         u32 max_out_time;
  76         u32 suspend_time;
  77         bool passive_fragmented;
  78         struct _dwell {
  79                 u16 passive;
  80                 u16 active;
  81         } dwell[IEEE80211_NUM_BANDS];
  82 };
  83
  84 static inline __le16 iwl_mvm_scan_rx_chain(struct iwl_mvm *mvm)
  85 {
  86         u16 rx_chain;
  87         u8 rx_ant;
  88
  89         if (mvm->scan_rx_ant != ANT_NONE)
  90                 rx_ant = mvm->scan_rx_ant;
  91         else
  92                 rx_ant = mvm->fw->valid_rx_ant;
  93         rx_chain = rx_ant << PHY_RX_CHAIN_VALID_POS;
  94         rx_chain |= rx_ant << PHY_RX_CHAIN_FORCE_MIMO_SEL_POS;
  95         rx_chain |= rx_ant << PHY_RX_CHAIN_FORCE_SEL_POS;
  96         rx_chain |= 0x1 << PHY_RX_CHAIN_DRIVER_FORCE_POS;
  97         return cpu_to_le16(rx_chain);
  98 }
  99
 100 static inline __le32
 101 iwl_mvm_scan_rxon_flags(struct cfg80211_scan_request *req)
 102 {
 103         if (req->channels[0]->band == IEEE80211_BAND_2GHZ)
 104                 return cpu_to_le32(PHY_BAND_24);
 105         else
 106                 return cpu_to_le32(PHY_BAND_5);
 107 }
 108
 109 static inline __le32
 110 iwl_mvm_scan_rate_n_flags(struct iwl_mvm *mvm, enum ieee80211_band band,
 111                           bool no_cck)
 112 {
 113         u32 tx_ant;
 114
 115         mvm->scan_last_antenna_idx =
 116                 iwl_mvm_next_antenna(mvm, mvm->fw->valid_tx_ant,
 117                                      mvm->scan_last_antenna_idx);
 118         tx_ant = BIT(mvm->scan_last_antenna_idx) << RATE_MCS_ANT_POS;
 119
 120         if (band == IEEE80211_BAND_2GHZ && !no_cck)
 121                 return cpu_to_le32(IWL_RATE_1M_PLCP | RATE_MCS_CCK_MSK |
 122                                    tx_ant);
 123         else
 124                 return cpu_to_le32(IWL_RATE_6M_PLCP | tx_ant);
 125 }
 126
 127 /*
 128  * We insert the SSIDs in an inverted order, because the FW will
 129  * invert it back. The most prioritized SSID, which is first in the
 130  * request list, is not copied here, but inserted directly to the probe
 131  * request.
 132  */
 133 static void iwl_mvm_scan_fill_ssids(struct iwl_scan_cmd *cmd,
 134                                     struct cfg80211_scan_request *req,
 135                                     int first)
 136 {
 137         int fw_idx, req_idx;
 138
 139         for (req_idx = req->n_ssids - 1, fw_idx = 0; req_idx >= first;
 140              req_idx--, fw_idx++) {
 141                 cmd->direct_scan[fw_idx].id = WLAN_EID_SSID;
 142                 cmd->direct_scan[fw_idx].len = req->ssids[req_idx].ssid_len;
 143                 memcpy(cmd->direct_scan[fw_idx].ssid,
 144                        req->ssids[req_idx].ssid,
 145                        req->ssids[req_idx].ssid_len);
 146         }
 147 }
 148
 149 /*
 150  * If req->n_ssids > 0, it means we should do an active scan.
 151  * In case of active scan w/o directed scan, we receive a zero-length SSID
 152  * just to notify that this scan is active and not passive.
 153  * In order to notify the FW of the number of SSIDs we wish to scan (including
 154  * the zero-length one), we need to set the corresponding bits in chan->type,
 155  * one for each SSID, and set the active bit (first). If the first SSID is
 156  * already included in the probe template, so we need to set only
 157  * req->n_ssids - 1 bits in addition to the first bit.
 158  */
 159 static u16 iwl_mvm_get_active_dwell(enum ieee80211_band band, int n_ssids)
 160 {
 161         if (band == IEEE80211_BAND_2GHZ)
 162                 return 30  + 3 * (n_ssids + 1);
 163         return 20  + 2 * (n_ssids + 1);
 164 }
 165
 166 static u16 iwl_mvm_get_passive_dwell(enum ieee80211_band band)
 167 {
 168         return band == IEEE80211_BAND_2GHZ ? 100 + 20 : 100 + 10;
 169 }
 170
 171 static void iwl_mvm_scan_fill_channels(struct iwl_scan_cmd *cmd,
 172                                        struct cfg80211_scan_request *req,
 173                                        bool basic_ssid,
 174                                        struct iwl_mvm_scan_params *params)
 175 {
 176         struct iwl_scan_channel *chan = (struct iwl_scan_channel *)
 177                 (cmd->data + le16_to_cpu(cmd->tx_cmd.len));
 178         int i;
 179         int type = BIT(req->n_ssids) - 1;
 180         enum ieee80211_band band = req->channels[0]->band;
 181
 182         if (!basic_ssid)
 183                 type |= BIT(req->n_ssids);
 184
 185         for (i = 0; i < cmd->channel_count; i++) {
 186                 chan->channel = cpu_to_le16(req->channels[i]->hw_value);
 187                 chan->type = cpu_to_le32(type);
 188                 if (req->channels[i]->flags & IEEE80211_CHAN_NO_IR)
 189                         chan->type &= cpu_to_le32(~SCAN_CHANNEL_TYPE_ACTIVE);
 190                 chan->active_dwell = cpu_to_le16(params->dwell[band].active);
 191                 chan->passive_dwell = cpu_to_le16(params->dwell[band].passive);
 192                 chan->iteration_count = cpu_to_le16(1);
 193                 chan++;
 194         }
 195 }
 196
 197 /*
 198  * Fill in probe request with the following parameters:
 199  * TA is our vif HW address, which mac80211 ensures we have.
 200  * Packet is broadcasted, so this is both SA and DA.
 201  * The probe request IE is made out of two: first comes the most prioritized
 202  * SSID if a directed scan is requested. Second comes whatever extra
 203  * information was given to us as the scan request IE.
 204  */
 205 static u16 iwl_mvm_fill_probe_req(struct ieee80211_mgmt *frame, const u8 *ta,
 206                                   int n_ssids, const u8 *ssid, int ssid_len,
 207                                   const u8 *ie, int ie_len,
 208                                   int left)
 209 {
 210         int len = 0;
 211         u8 *pos = NULL;
 212
 213         /* Make sure there is enough space for the probe request,
 214          * two mandatory IEs and the data */
 215         left -= 24;
 216         if (left < 0)
 217                 return 0;
 218
 219         frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
 220         eth_broadcast_addr(frame->da);
 221         memcpy(frame->sa, ta, ETH_ALEN);
 222         eth_broadcast_addr(frame->bssid);
 223         frame->seq_ctrl = 0;
 224
 225         len += 24;
 226
 227         /* for passive scans, no need to fill anything */
 228         if (n_ssids == 0)
 229                 return (u16)len;
 230
 231         /* points to the payload of the request */
 232         pos = &frame->u.probe_req.variable[0];
 233
 234         /* fill in our SSID IE */
 235         left -= ssid_len + 2;
 236         if (left < 0)
 237                 return 0;
 238         *pos++ = WLAN_EID_SSID;
 239         *pos++ = ssid_len;
 240         if (ssid && ssid_len) { /* ssid_len may be == 0 even if ssid is valid */
 241                 memcpy(pos, ssid, ssid_len);
 242                 pos += ssid_len;
 243         }
 244
 245         len += ssid_len + 2;
 246
 247         if (WARN_ON(left < ie_len))
 248                 return len;
 249
 250         if (ie && ie_len) {
 251                 memcpy(pos, ie, ie_len);
 252                 len += ie_len;
 253         }
 254
 255         return (u16)len;
 256 }
 257
 258 static void iwl_mvm_scan_condition_iterator(void *data, u8 *mac,
 259                                             struct ieee80211_vif *vif)
 260 {
 261         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 262         bool *global_bound = data;
 263
 264         if (mvmvif->phy_ctxt && mvmvif->phy_ctxt->id < MAX_PHYS)
 265                 *global_bound = true;
 266 }
 267
 268 static void iwl_mvm_scan_calc_params(struct iwl_mvm *mvm,
 269                                      struct ieee80211_vif *vif,
 270                                      int n_ssids,
 271                                      struct iwl_mvm_scan_params *params)
 272 {
 273         bool global_bound = false;
 274         enum ieee80211_band band;
 275
 276         ieee80211_iterate_active_interfaces_atomic(mvm->hw,
 277                                             IEEE80211_IFACE_ITER_NORMAL,
 278                                             iwl_mvm_scan_condition_iterator,
 279                                             &global_bound);
 280
 281         if (!global_bound)
 282                 goto not_bound;
 283
 284         params->suspend_time = 100;
 285         params->max_out_time = 600;
 286
 287         if (iwl_mvm_low_latency(mvm)) {
 288                 params->suspend_time = 250;
 289                 params->max_out_time = 250;
 290         }
 291
 292 not_bound:
 293
 294         for (band = IEEE80211_BAND_2GHZ; band < IEEE80211_NUM_BANDS; band++) {
 295                 params->dwell[band].passive = iwl_mvm_get_passive_dwell(band);
 296                 params->dwell[band].active = iwl_mvm_get_active_dwell(band,
 297                                                                       n_ssids);
 298         }
 299 }
 300
 301 int iwl_mvm_scan_request(struct iwl_mvm *mvm,
 302                          struct ieee80211_vif *vif,
 303                          struct cfg80211_scan_request *req)
 304 {
 305         struct iwl_host_cmd hcmd = {
 306                 .id = SCAN_REQUEST_CMD,
 307                 .len = { 0, },
 308                 .data = { mvm->scan_cmd, },
 309                 .flags = CMD_SYNC,
 310                 .dataflags = { IWL_HCMD_DFL_NOCOPY, },
 311         };
 312         struct iwl_scan_cmd *cmd = mvm->scan_cmd;
 313         int ret;
 314         u32 status;
 315         int ssid_len = 0;
 316         u8 *ssid = NULL;
 317         bool basic_ssid = !(mvm->fw->ucode_capa.flags &
 318                            IWL_UCODE_TLV_FLAGS_NO_BASIC_SSID);
 319         struct iwl_mvm_scan_params params = {};
 320
 321         lockdep_assert_held(&mvm->mutex);
 322
 323         /* we should have failed registration if scan_cmd was NULL */
 324         if (WARN_ON(mvm->scan_cmd == NULL))
 325                 return -ENOMEM;
 326
 327         IWL_DEBUG_SCAN(mvm, "Handling mac80211 scan request\n");
 328         mvm->scan_status = IWL_MVM_SCAN_OS;
 329         memset(cmd, 0, sizeof(struct iwl_scan_cmd) +
 330                mvm->fw->ucode_capa.max_probe_length +
 331                (MAX_NUM_SCAN_CHANNELS * sizeof(struct iwl_scan_channel)));
 332
 333         cmd->channel_count = (u8)req->n_channels;
 334         cmd->quiet_time = cpu_to_le16(IWL_ACTIVE_QUIET_TIME);
 335         cmd->quiet_plcp_th = cpu_to_le16(IWL_PLCP_QUIET_THRESH);
 336         cmd->rxchain_sel_flags = iwl_mvm_scan_rx_chain(mvm);
 337
 338         iwl_mvm_scan_calc_params(mvm, vif, req->n_ssids, &params);
 339         cmd->max_out_time = cpu_to_le32(params.max_out_time);
 340         cmd->suspend_time = cpu_to_le32(params.suspend_time);
 341         if (params.passive_fragmented)
 342                 cmd->scan_flags |= SCAN_FLAGS_FRAGMENTED_SCAN;
 343
 344         cmd->rxon_flags = iwl_mvm_scan_rxon_flags(req);
 345         cmd->filter_flags = cpu_to_le32(MAC_FILTER_ACCEPT_GRP |
 346                                         MAC_FILTER_IN_BEACON);
 347
 348         if (vif->type == NL80211_IFTYPE_P2P_DEVICE)
 349                 cmd->type = cpu_to_le32(SCAN_TYPE_DISCOVERY_FORCED);
 350         else
 351                 cmd->type = cpu_to_le32(SCAN_TYPE_FORCED);
 352
 353         cmd->repeats = cpu_to_le32(1);
 354
 355         /*
 356          * If the user asked for passive scan, don't change to active scan if
 357          * you see any activity on the channel - remain passive.
 358          */
 359         if (req->n_ssids > 0) {
 360                 cmd->passive2active = cpu_to_le16(1);
 361                 cmd->scan_flags |= SCAN_FLAGS_PASSIVE2ACTIVE;
 362                 if (basic_ssid) {
 363                         ssid = req->ssids[0].ssid;
 364                         ssid_len = req->ssids[0].ssid_len;
 365                 }
 366         } else {
 367                 cmd->passive2active = 0;
 368                 cmd->scan_flags &= ~SCAN_FLAGS_PASSIVE2ACTIVE;
 369         }
 370
 371         iwl_mvm_scan_fill_ssids(cmd, req, basic_ssid ? 1 : 0);
 372
 373         cmd->tx_cmd.tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL |
 374                                            TX_CMD_FLG_BT_DIS);
 375         cmd->tx_cmd.sta_id = mvm->aux_sta.sta_id;
 376         cmd->tx_cmd.life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
 377         cmd->tx_cmd.rate_n_flags =
 378                         iwl_mvm_scan_rate_n_flags(mvm, req->channels[0]->band,
 379                                                   req->no_cck);
 380
 381         cmd->tx_cmd.len =
 382                 cpu_to_le16(iwl_mvm_fill_probe_req(
 383                             (struct ieee80211_mgmt *)cmd->data,
 384                             vif->addr,
 385                             req->n_ssids, ssid, ssid_len,
 386                             req->ie, req->ie_len,
 387                             mvm->fw->ucode_capa.max_probe_length));
 388
 389         iwl_mvm_scan_fill_channels(cmd, req, basic_ssid, &params);
 390
 391         cmd->len = cpu_to_le16(sizeof(struct iwl_scan_cmd) +
 392                 le16_to_cpu(cmd->tx_cmd.len) +
 393                 (cmd->channel_count * sizeof(struct iwl_scan_channel)));
 394         hcmd.len[0] = le16_to_cpu(cmd->len);
 395
 396         status = SCAN_RESPONSE_OK;
 397         ret = iwl_mvm_send_cmd_status(mvm, &hcmd, &status);
 398         if (!ret && status == SCAN_RESPONSE_OK) {
 399                 IWL_DEBUG_SCAN(mvm, "Scan request was sent successfully\n");
 400         } else {
 401                 /*
 402                  * If the scan failed, it usually means that the FW was unable
 403                  * to allocate the time events. Warn on it, but maybe we
 404                  * should try to send the command again with different params.
 405                  */
 406                 IWL_ERR(mvm, "Scan failed! status 0x%x ret %d\n",
 407                         status, ret);
 408                 mvm->scan_status = IWL_MVM_SCAN_NONE;
 409                 ret = -EIO;
 410         }
 411         return ret;
 412 }
 413
 414 int iwl_mvm_rx_scan_response(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 415                           struct iwl_device_cmd *cmd)
 416 {
 417         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 418         struct iwl_cmd_response *resp = (void *)pkt->data;
 419
 420         IWL_DEBUG_SCAN(mvm, "Scan response received. status 0x%x\n",
 421                        le32_to_cpu(resp->status));
 422         return 0;
 423 }
 424
 425 int iwl_mvm_rx_scan_complete(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 426                           struct iwl_device_cmd *cmd)
 427 {
 428         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 429         struct iwl_scan_complete_notif *notif = (void *)pkt->data;
 430
 431         lockdep_assert_held(&mvm->mutex);
 432
 433         IWL_DEBUG_SCAN(mvm, "Scan complete: status=0x%x scanned channels=%d\n",
 434                        notif->status, notif->scanned_channels);
 435
 436         if (mvm->scan_status == IWL_MVM_SCAN_OS)
 437                 mvm->scan_status = IWL_MVM_SCAN_NONE;
 438         ieee80211_scan_completed(mvm->hw, notif->status != SCAN_COMP_STATUS_OK);
 439
 440         iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
 441
 442         return 0;
 443 }
 444
 445 int iwl_mvm_rx_sched_scan_results(struct iwl_mvm *mvm,
 446                                   struct iwl_rx_cmd_buffer *rxb,
 447                                   struct iwl_device_cmd *cmd)
 448 {
 449         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 450         struct iwl_sched_scan_results *notif = (void *)pkt->data;
 451
 452         if (notif->client_bitmap & SCAN_CLIENT_SCHED_SCAN) {
 453                 IWL_DEBUG_SCAN(mvm, "Scheduled scan results\n");
 454                 ieee80211_sched_scan_results(mvm->hw);
 455         }
 456
 457         return 0;
 458 }
 459
 460 static bool iwl_mvm_scan_abort_notif(struct iwl_notif_wait_data *notif_wait,
 461                                      struct iwl_rx_packet *pkt, void *data)
 462 {
 463         struct iwl_mvm *mvm =
 464                 container_of(notif_wait, struct iwl_mvm, notif_wait);
 465         struct iwl_scan_complete_notif *notif;
 466         u32 *resp;
 467
 468         switch (pkt->hdr.cmd) {
 469         case SCAN_ABORT_CMD:
 470                 resp = (void *)pkt->data;
 471                 if (*resp == CAN_ABORT_STATUS) {
 472                         IWL_DEBUG_SCAN(mvm,
 473                                        "Scan can be aborted, wait until completion\n");
 474                         return false;
 475                 }
 476
 477                 /*
 478                  * If scan cannot be aborted, it means that we had a
 479                  * SCAN_COMPLETE_NOTIFICATION in the pipe and it called
 480                  * ieee80211_scan_completed already.
 481                  */
 482                 IWL_DEBUG_SCAN(mvm, "Scan cannot be aborted, exit now: %d\n",
 483                                *resp);
 484                 return true;
 485
 486         case SCAN_COMPLETE_NOTIFICATION:
 487                 notif = (void *)pkt->data;
 488                 IWL_DEBUG_SCAN(mvm, "Scan aborted: status 0x%x\n",
 489                                notif->status);
 490                 return true;
 491
 492         default:
 493                 WARN_ON(1);
 494                 return false;
 495         };
 496 }
 497
 498 int iwl_mvm_cancel_scan(struct iwl_mvm *mvm)
 499 {
 500         struct iwl_notification_wait wait_scan_abort;
 501         static const u8 scan_abort_notif[] = { SCAN_ABORT_CMD,
 502                                                SCAN_COMPLETE_NOTIFICATION };
 503         int ret;
 504
 505         if (mvm->scan_status == IWL_MVM_SCAN_NONE)
 506                 return 0;
 507
 508         if (iwl_mvm_is_radio_killed(mvm)) {
 509                 ieee80211_scan_completed(mvm->hw, true);
 510                 iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
 511                 mvm->scan_status = IWL_MVM_SCAN_NONE;
 512                 return 0;
 513         }
 514
 515         iwl_init_notification_wait(&mvm->notif_wait, &wait_scan_abort,
 516                                    scan_abort_notif,
 517                                    ARRAY_SIZE(scan_abort_notif),
 518                                    iwl_mvm_scan_abort_notif, NULL);
 519
 520         ret = iwl_mvm_send_cmd_pdu(mvm, SCAN_ABORT_CMD, CMD_SYNC, 0, NULL);
 521         if (ret) {
 522                 IWL_ERR(mvm, "Couldn't send SCAN_ABORT_CMD: %d\n", ret);
 523                 /* mac80211's state will be cleaned in the nic_restart flow */
 524                 goto out_remove_notif;
 525         }
 526
 527         return iwl_wait_notification(&mvm->notif_wait, &wait_scan_abort, HZ);
 528
 529 out_remove_notif:
 530         iwl_remove_notification(&mvm->notif_wait, &wait_scan_abort);
 531         return ret;
 532 }
 533
 534 int iwl_mvm_rx_scan_offload_complete_notif(struct iwl_mvm *mvm,
 535                                            struct iwl_rx_cmd_buffer *rxb,
 536                                            struct iwl_device_cmd *cmd)
 537 {
 538         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 539         struct iwl_scan_offload_complete *scan_notif = (void *)pkt->data;
 540
 541         /* scan status must be locked for proper checking */
 542         lockdep_assert_held(&mvm->mutex);
 543
 544         IWL_DEBUG_SCAN(mvm,
 545                        "Scheduled scan completed, status %s EBS status %s:%d\n",
 546                        scan_notif->status == IWL_SCAN_OFFLOAD_COMPLETED ?
 547                        "completed" : "aborted", scan_notif->ebs_status ==
 548                        IWL_SCAN_EBS_SUCCESS ? "success" : "failed",
 549                        scan_notif->ebs_status);
 550
 551
 552         /* only call mac80211 completion if the stop was initiated by FW */
 553         if (mvm->scan_status == IWL_MVM_SCAN_SCHED) {
 554                 mvm->scan_status = IWL_MVM_SCAN_NONE;
 555                 ieee80211_sched_scan_stopped(mvm->hw);
 556         }
 557
 558         mvm->last_ebs_successful = !scan_notif->ebs_status;
 559
 560         return 0;
 561 }
 562
 563 static void iwl_scan_offload_build_tx_cmd(struct iwl_mvm *mvm,
 564                                           struct ieee80211_vif *vif,
 565                                           struct ieee80211_sched_scan_ies *ies,
 566                                           enum ieee80211_band band,
 567                                           struct iwl_tx_cmd *cmd,
 568                                           u8 *data)
 569 {
 570         u16 cmd_len;
 571
 572         cmd->tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL);
 573         cmd->life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
 574         cmd->sta_id = mvm->aux_sta.sta_id;
 575
 576         cmd->rate_n_flags = iwl_mvm_scan_rate_n_flags(mvm, band, false);
 577
 578         cmd_len = iwl_mvm_fill_probe_req((struct ieee80211_mgmt *)data,
 579                                          vif->addr,
 580                                          1, NULL, 0,
 581                                          ies->ie[band], ies->len[band],
 582                                          SCAN_OFFLOAD_PROBE_REQ_SIZE);
 583         cmd->len = cpu_to_le16(cmd_len);
 584 }
 585
 586 static void iwl_build_scan_cmd(struct iwl_mvm *mvm,
 587                                struct ieee80211_vif *vif,
 588                                struct cfg80211_sched_scan_request *req,
 589                                struct iwl_scan_offload_cmd *scan,
 590                                struct iwl_mvm_scan_params *params)
 591 {
 592         scan->channel_count =
 593                 mvm->nvm_data->bands[IEEE80211_BAND_2GHZ].n_channels +
 594                 mvm->nvm_data->bands[IEEE80211_BAND_5GHZ].n_channels;
 595         scan->quiet_time = cpu_to_le16(IWL_ACTIVE_QUIET_TIME);
 596         scan->quiet_plcp_th = cpu_to_le16(IWL_PLCP_QUIET_THRESH);
 597         scan->good_CRC_th = IWL_GOOD_CRC_TH_DEFAULT;
 598         scan->rx_chain = iwl_mvm_scan_rx_chain(mvm);
 599
 600         scan->max_out_time = cpu_to_le32(params->max_out_time);
 601         scan->suspend_time = cpu_to_le32(params->suspend_time);
 602
 603         scan->filter_flags |= cpu_to_le32(MAC_FILTER_ACCEPT_GRP |
 604                                           MAC_FILTER_IN_BEACON);
 605         scan->scan_type = cpu_to_le32(SCAN_TYPE_BACKGROUND);
 606         scan->rep_count = cpu_to_le32(1);
 607
 608         if (params->passive_fragmented)
 609                 scan->scan_flags |= SCAN_FLAGS_FRAGMENTED_SCAN;
 610 }
 611
 612 static int iwl_ssid_exist(u8 *ssid, u8 ssid_len, struct iwl_ssid_ie *ssid_list)
 613 {
 614         int i;
 615
 616         for (i = 0; i < PROBE_OPTION_MAX; i++) {
 617                 if (!ssid_list[i].len)
 618                         break;
 619                 if (ssid_list[i].len == ssid_len &&
 620                     !memcmp(ssid_list->ssid, ssid, ssid_len))
 621                         return i;
 622         }
 623         return -1;
 624 }
 625
 626 static void iwl_scan_offload_build_ssid(struct cfg80211_sched_scan_request *req,
 627                                         struct iwl_scan_offload_cmd *scan,
 628                                         u32 *ssid_bitmap)
 629 {
 630         int i, j;
 631         int index;
 632
 633         /*
 634          * copy SSIDs from match list.
 635          * iwl_config_sched_scan_profiles() uses the order of these ssids to
 636          * config match list.
 637          */
 638         for (i = 0; i < req->n_match_sets && i < PROBE_OPTION_MAX; i++) {
 639                 /* skip empty SSID matchsets */
 640                 if (!req->match_sets[i].ssid.ssid_len)
 641                         continue;
 642                 scan->direct_scan[i].id = WLAN_EID_SSID;
 643                 scan->direct_scan[i].len = req->match_sets[i].ssid.ssid_len;
 644                 memcpy(scan->direct_scan[i].ssid, req->match_sets[i].ssid.ssid,
 645                        scan->direct_scan[i].len);
 646         }
 647
 648         /* add SSIDs from scan SSID list */
 649         *ssid_bitmap = 0;
 650         for (j = 0; j < req->n_ssids && i < PROBE_OPTION_MAX; j++) {
 651                 index = iwl_ssid_exist(req->ssids[j].ssid,
 652                                        req->ssids[j].ssid_len,
 653                                        scan->direct_scan);
 654                 if (index < 0) {
 655                         if (!req->ssids[j].ssid_len)
 656                                 continue;
 657                         scan->direct_scan[i].id = WLAN_EID_SSID;
 658                         scan->direct_scan[i].len = req->ssids[j].ssid_len;
 659                         memcpy(scan->direct_scan[i].ssid, req->ssids[j].ssid,
 660                                scan->direct_scan[i].len);
 661                         *ssid_bitmap |= BIT(i + 1);
 662                         i++;
 663                 } else {
 664                         *ssid_bitmap |= BIT(index + 1);
 665                 }
 666         }
 667 }
 668
 669 static void iwl_build_channel_cfg(struct iwl_mvm *mvm,
 670                                   struct cfg80211_sched_scan_request *req,
 671                                   struct iwl_scan_channel_cfg *channels,
 672                                   enum ieee80211_band band,
 673                                   int *head, int *tail,
 674                                   u32 ssid_bitmap,
 675                                   struct iwl_mvm_scan_params *params)
 676 {
 677         struct ieee80211_supported_band *s_band;
 678         int n_channels = req->n_channels;
 679         int i, j, index = 0;
 680         bool partial;
 681
 682         /*
 683          * We have to configure all supported channels, even if we don't want to
 684          * scan on them, but we have to send channels in the order that we want
 685          * to scan. So add requested channels to head of the list and others to
 686          * the end.
 687         */
 688         s_band = &mvm->nvm_data->bands[band];
 689
 690         for (i = 0; i < s_band->n_channels && *head <= *tail; i++) {
 691                 partial = false;
 692                 for (j = 0; j < n_channels; j++)
 693                         if (s_band->channels[i].center_freq ==
 694                                                 req->channels[j]->center_freq) {
 695                                 index = *head;
 696                                 (*head)++;
 697                                 /*
 698                                  * Channels that came with the request will be
 699                                  * in partial scan .
 700                                  */
 701                                 partial = true;
 702                                 break;
 703                         }
 704                 if (!partial) {
 705                         index = *tail;
 706                         (*tail)--;
 707                 }
 708                 channels->channel_number[index] =
 709                         cpu_to_le16(ieee80211_frequency_to_channel(
 710                                         s_band->channels[i].center_freq));
 711                 channels->dwell_time[index][0] = params->dwell[band].active;
 712                 channels->dwell_time[index][1] = params->dwell[band].passive;
 713
 714                 channels->iter_count[index] = cpu_to_le16(1);
 715                 channels->iter_interval[index] = 0;
 716
 717                 if (!(s_band->channels[i].flags & IEEE80211_CHAN_NO_IR))
 718                         channels->type[index] |=
 719                                 cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_ACTIVE);
 720
 721                 channels->type[index] |=
 722                                 cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_FULL);
 723                 if (partial)
 724                         channels->type[index] |=
 725                                 cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_PARTIAL);
 726
 727                 if (s_band->channels[i].flags & IEEE80211_CHAN_NO_HT40)
 728                         channels->type[index] |=
 729                                 cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_NARROW);
 730
 731                 /* scan for all SSIDs from req->ssids */
 732                 channels->type[index] |= cpu_to_le32(ssid_bitmap);
 733         }
 734 }
 735
 736 int iwl_mvm_config_sched_scan(struct iwl_mvm *mvm,
 737                               struct ieee80211_vif *vif,
 738                               struct cfg80211_sched_scan_request *req,
 739                               struct ieee80211_sched_scan_ies *ies)
 740 {
 741         int band_2ghz = mvm->nvm_data->bands[IEEE80211_BAND_2GHZ].n_channels;
 742         int band_5ghz = mvm->nvm_data->bands[IEEE80211_BAND_5GHZ].n_channels;
 743         int head = 0;
 744         int tail = band_2ghz + band_5ghz - 1;
 745         u32 ssid_bitmap;
 746         int cmd_len;
 747         int ret;
 748
 749         struct iwl_scan_offload_cfg *scan_cfg;
 750         struct iwl_host_cmd cmd = {
 751                 .id = SCAN_OFFLOAD_CONFIG_CMD,
 752                 .flags = CMD_SYNC,
 753         };
 754         struct iwl_mvm_scan_params params = {};
 755
 756         lockdep_assert_held(&mvm->mutex);
 757
 758         cmd_len = sizeof(struct iwl_scan_offload_cfg) +
 759                   2 * SCAN_OFFLOAD_PROBE_REQ_SIZE;
 760
 761         scan_cfg = kzalloc(cmd_len, GFP_KERNEL);
 762         if (!scan_cfg)
 763                 return -ENOMEM;
 764
 765         iwl_mvm_scan_calc_params(mvm, vif, req->n_ssids, &params);
 766         iwl_build_scan_cmd(mvm, vif, req, &scan_cfg->scan_cmd, &params);
 767         scan_cfg->scan_cmd.len = cpu_to_le16(cmd_len);
 768
 769         iwl_scan_offload_build_ssid(req, &scan_cfg->scan_cmd, &ssid_bitmap);
 770         /* build tx frames for supported bands */
 771         if (band_2ghz) {
 772                 iwl_scan_offload_build_tx_cmd(mvm, vif, ies,
 773                                               IEEE80211_BAND_2GHZ,
 774                                               &scan_cfg->scan_cmd.tx_cmd[0],
 775                                               scan_cfg->data);
 776                 iwl_build_channel_cfg(mvm, req, &scan_cfg->channel_cfg,
 777                                       IEEE80211_BAND_2GHZ, &head, &tail,
 778                                       ssid_bitmap, &params);
 779         }
 780         if (band_5ghz) {
 781                 iwl_scan_offload_build_tx_cmd(mvm, vif, ies,
 782                                               IEEE80211_BAND_5GHZ,
 783                                               &scan_cfg->scan_cmd.tx_cmd[1],
 784                                               scan_cfg->data +
 785                                                 SCAN_OFFLOAD_PROBE_REQ_SIZE);
 786                 iwl_build_channel_cfg(mvm, req, &scan_cfg->channel_cfg,
 787                                       IEEE80211_BAND_5GHZ, &head, &tail,
 788                                       ssid_bitmap, &params);
 789         }
 790
 791         cmd.data[0] = scan_cfg;
 792         cmd.len[0] = cmd_len;
 793         cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
 794
 795         IWL_DEBUG_SCAN(mvm, "Sending scheduled scan config\n");
 796
 797         ret = iwl_mvm_send_cmd(mvm, &cmd);
 798         kfree(scan_cfg);
 799         return ret;
 800 }
 801
 802 int iwl_mvm_config_sched_scan_profiles(struct iwl_mvm *mvm,
 803                                        struct cfg80211_sched_scan_request *req)
 804 {
 805         struct iwl_scan_offload_profile *profile;
 806         struct iwl_scan_offload_profile_cfg *profile_cfg;
 807         struct iwl_scan_offload_blacklist *blacklist;
 808         struct iwl_host_cmd cmd = {
 809                 .id = SCAN_OFFLOAD_UPDATE_PROFILES_CMD,
 810                 .flags = CMD_SYNC,
 811                 .len[1] = sizeof(*profile_cfg),
 812                 .dataflags[0] = IWL_HCMD_DFL_NOCOPY,
 813                 .dataflags[1] = IWL_HCMD_DFL_NOCOPY,
 814         };
 815         int blacklist_len;
 816         int i;
 817         int ret;
 818
 819         if (WARN_ON(req->n_match_sets > IWL_SCAN_MAX_PROFILES))
 820                         return -EIO;
 821
 822         if (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_SHORT_BL)
 823                 blacklist_len = IWL_SCAN_SHORT_BLACKLIST_LEN;
 824         else
 825                 blacklist_len = IWL_SCAN_MAX_BLACKLIST_LEN;
 826
 827         blacklist = kzalloc(sizeof(*blacklist) * blacklist_len, GFP_KERNEL);
 828         if (!blacklist)
 829                 return -ENOMEM;
 830
 831         profile_cfg = kzalloc(sizeof(*profile_cfg), GFP_KERNEL);
 832         if (!profile_cfg) {
 833                 ret = -ENOMEM;
 834                 goto free_blacklist;
 835         }
 836
 837         cmd.data[0] = blacklist;
 838         cmd.len[0] = sizeof(*blacklist) * blacklist_len;
 839         cmd.data[1] = profile_cfg;
 840
 841         /* No blacklist configuration */
 842
 843         profile_cfg->num_profiles = req->n_match_sets;
 844         profile_cfg->active_clients = SCAN_CLIENT_SCHED_SCAN;
 845         profile_cfg->pass_match = SCAN_CLIENT_SCHED_SCAN;
 846         profile_cfg->match_notify = SCAN_CLIENT_SCHED_SCAN;
 847         if (!req->n_match_sets || !req->match_sets[0].ssid.ssid_len)
 848                 profile_cfg->any_beacon_notify = SCAN_CLIENT_SCHED_SCAN;
 849
 850         for (i = 0; i < req->n_match_sets; i++) {
 851                 profile = &profile_cfg->profiles[i];
 852                 profile->ssid_index = i;
 853                 /* Support any cipher and auth algorithm */
 854                 profile->unicast_cipher = 0xff;
 855                 profile->auth_alg = 0xff;
 856                 profile->network_type = IWL_NETWORK_TYPE_ANY;
 857                 profile->band_selection = IWL_SCAN_OFFLOAD_SELECT_ANY;
 858                 profile->client_bitmap = SCAN_CLIENT_SCHED_SCAN;
 859         }
 860
 861         IWL_DEBUG_SCAN(mvm, "Sending scheduled scan profile config\n");
 862
 863         ret = iwl_mvm_send_cmd(mvm, &cmd);
 864         kfree(profile_cfg);
 865 free_blacklist:
 866         kfree(blacklist);
 867
 868         return ret;
 869 }
 870
 871 int iwl_mvm_sched_scan_start(struct iwl_mvm *mvm,
 872                              struct cfg80211_sched_scan_request *req)
 873 {
 874         struct iwl_scan_offload_req scan_req = {
 875                 .watchdog = IWL_SCHED_SCAN_WATCHDOG,
 876
 877                 .schedule_line[0].iterations = IWL_FAST_SCHED_SCAN_ITERATIONS,
 878                 .schedule_line[0].delay = req->interval / 1000,
 879                 .schedule_line[0].full_scan_mul = 1,
 880
 881                 .schedule_line[1].iterations = 0xff,
 882                 .schedule_line[1].delay = req->interval / 1000,
 883                 .schedule_line[1].full_scan_mul = IWL_FULL_SCAN_MULTIPLIER,
 884         };
 885
 886         if (req->n_match_sets && req->match_sets[0].ssid.ssid_len) {
 887                 IWL_DEBUG_SCAN(mvm,
 888                                "Sending scheduled scan with filtering, filter len %d\n",
 889                                req->n_match_sets);
 890         } else {
 891                 IWL_DEBUG_SCAN(mvm,
 892                                "Sending Scheduled scan without filtering\n");
 893                 scan_req.flags |= cpu_to_le16(IWL_SCAN_OFFLOAD_FLAG_PASS_ALL);
 894         }
 895
 896         if (mvm->last_ebs_successful &&
 897             mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_EBS_SUPPORT)
 898                 scan_req.flags |=
 899                         cpu_to_le16(IWL_SCAN_OFFLOAD_FLAG_EBS_ACCURATE_MODE);
 900
 901         return iwl_mvm_send_cmd_pdu(mvm, SCAN_OFFLOAD_REQUEST_CMD, CMD_SYNC,
 902                                     sizeof(scan_req), &scan_req);
 903 }
 904
 905 static int iwl_mvm_send_sched_scan_abort(struct iwl_mvm *mvm)
 906 {
 907         int ret;
 908         struct iwl_host_cmd cmd = {
 909                 .id = SCAN_OFFLOAD_ABORT_CMD,
 910                 .flags = CMD_SYNC,
 911         };
 912         u32 status;
 913
 914         /* Exit instantly with error when device is not ready
 915          * to receive scan abort command or it does not perform
 916          * scheduled scan currently */
 917         if (mvm->scan_status != IWL_MVM_SCAN_SCHED)
 918                 return -EIO;
 919
 920         ret = iwl_mvm_send_cmd_status(mvm, &cmd, &status);
 921         if (ret)
 922                 return ret;
 923
 924         if (status != CAN_ABORT_STATUS) {
 925                 /*
 926                  * The scan abort will return 1 for success or
 927                  * 2 for "failure".  A failure condition can be
 928                  * due to simply not being in an active scan which
 929                  * can occur if we send the scan abort before the
 930                  * microcode has notified us that a scan is completed.
 931                  */
 932                 IWL_DEBUG_SCAN(mvm, "SCAN OFFLOAD ABORT ret %d.\n", status);
 933                 ret = -ENOENT;
 934         }
 935
 936         return ret;
 937 }
 938
 939 int iwl_mvm_sched_scan_stop(struct iwl_mvm *mvm)
 940 {
 941         int ret;
 942         struct iwl_notification_wait wait_scan_done;
 943         static const u8 scan_done_notif[] = { SCAN_OFFLOAD_COMPLETE, };
 944
 945         lockdep_assert_held(&mvm->mutex);
 946
 947         if (mvm->scan_status != IWL_MVM_SCAN_SCHED) {
 948                 IWL_DEBUG_SCAN(mvm, "No offloaded scan to stop\n");
 949                 return 0;
 950         }
 951
 952         iwl_init_notification_wait(&mvm->notif_wait, &wait_scan_done,
 953                                    scan_done_notif,
 954                                    ARRAY_SIZE(scan_done_notif),
 955                                    NULL, NULL);
 956
 957         ret = iwl_mvm_send_sched_scan_abort(mvm);
 958         if (ret) {
 959                 IWL_DEBUG_SCAN(mvm, "Send stop offload scan failed %d\n", ret);
 960                 iwl_remove_notification(&mvm->notif_wait, &wait_scan_done);
 961                 return ret;
 962         }
 963
 964         IWL_DEBUG_SCAN(mvm, "Successfully sent stop offload scan\n");
 965
 966         ret = iwl_wait_notification(&mvm->notif_wait, &wait_scan_done, 1 * HZ);
 967         if (ret)
 968                 return ret;
 969
 970         /*
 971          * Clear the scan status so the next scan requests will succeed. This
 972          * also ensures the Rx handler doesn't do anything, as the scan was
 973          * stopped from above.
 974          */
 975         mvm->scan_status = IWL_MVM_SCAN_NONE;
 976
 977         return 0;
 978 }