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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  60  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  61  *
  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          * Under low latency traffic passive scan is fragmented meaning
 282          * that dwell on a particular channel will be fragmented. Each fragment
 283          * dwell time is 20ms and fragments period is 105ms. Skipping to next
 284          * channel will be delayed by the same period - 105ms. So suspend_time
 285          * parameter describing both fragments and channels skipping periods is
 286          * set to 105ms. This value is chosen so that overall passive scan
 287          * duration will not be too long. Max_out_time in this case is set to
 288          * 70ms, so for active scanning operating channel will be left for 70ms
 289          * while for passive still for 20ms (fragment dwell).
 290          */
 291         if (global_bound) {
 292                 if (!iwl_mvm_low_latency(mvm)) {
 293                         params->suspend_time = ieee80211_tu_to_usec(100);
 294                         params->max_out_time = ieee80211_tu_to_usec(600);
 295                 } else {
 296                         params->suspend_time = ieee80211_tu_to_usec(105);
 297                         /* P2P doesn't support fragmented passive scan, so
 298                          * configure max_out_time to be at least longest dwell
 299                          * time for passive scan.
 300                          */
 301                         if (vif->type == NL80211_IFTYPE_STATION && !vif->p2p) {
 302                                 params->max_out_time = ieee80211_tu_to_usec(70);
 303                                 params->passive_fragmented = true;
 304                         } else {
 305                                 u32 passive_dwell;
 306
 307                                 /*
 308                                  * Use band G so that passive channel dwell time
 309                                  * will be assigned with maximum value.
 310                                  */
 311                                 band = IEEE80211_BAND_2GHZ;
 312                                 passive_dwell = iwl_mvm_get_passive_dwell(band);
 313                                 params->max_out_time =
 314                                         ieee80211_tu_to_usec(passive_dwell);
 315                         }
 316                 }
 317         }
 318
 319         for (band = IEEE80211_BAND_2GHZ; band < IEEE80211_NUM_BANDS; band++) {
 320                 if (params->passive_fragmented)
 321                         params->dwell[band].passive = 20;
 322                 else
 323                         params->dwell[band].passive =
 324                                 iwl_mvm_get_passive_dwell(band);
 325                 params->dwell[band].active = iwl_mvm_get_active_dwell(band,
 326                                                                       n_ssids);
 327         }
 328 }
 329
 330 int iwl_mvm_scan_request(struct iwl_mvm *mvm,
 331                          struct ieee80211_vif *vif,
 332                          struct cfg80211_scan_request *req)
 333 {
 334         struct iwl_host_cmd hcmd = {
 335                 .id = SCAN_REQUEST_CMD,
 336                 .len = { 0, },
 337                 .data = { mvm->scan_cmd, },
 338                 .flags = CMD_SYNC,
 339                 .dataflags = { IWL_HCMD_DFL_NOCOPY, },
 340         };
 341         struct iwl_scan_cmd *cmd = mvm->scan_cmd;
 342         int ret;
 343         u32 status;
 344         int ssid_len = 0;
 345         u8 *ssid = NULL;
 346         bool basic_ssid = !(mvm->fw->ucode_capa.flags &
 347                            IWL_UCODE_TLV_FLAGS_NO_BASIC_SSID);
 348         struct iwl_mvm_scan_params params = {};
 349
 350         lockdep_assert_held(&mvm->mutex);
 351         BUG_ON(mvm->scan_cmd == NULL);
 352
 353         IWL_DEBUG_SCAN(mvm, "Handling mac80211 scan request\n");
 354         mvm->scan_status = IWL_MVM_SCAN_OS;
 355         memset(cmd, 0, sizeof(struct iwl_scan_cmd) +
 356                mvm->fw->ucode_capa.max_probe_length +
 357                (MAX_NUM_SCAN_CHANNELS * sizeof(struct iwl_scan_channel)));
 358
 359         cmd->channel_count = (u8)req->n_channels;
 360         cmd->quiet_time = cpu_to_le16(IWL_ACTIVE_QUIET_TIME);
 361         cmd->quiet_plcp_th = cpu_to_le16(IWL_PLCP_QUIET_THRESH);
 362         cmd->rxchain_sel_flags = iwl_mvm_scan_rx_chain(mvm);
 363
 364         iwl_mvm_scan_calc_params(mvm, vif, req->n_ssids, &params);
 365         cmd->max_out_time = cpu_to_le32(params.max_out_time);
 366         cmd->suspend_time = cpu_to_le32(params.suspend_time);
 367         if (params.passive_fragmented)
 368                 cmd->scan_flags |= SCAN_FLAGS_FRAGMENTED_SCAN;
 369
 370         cmd->rxon_flags = iwl_mvm_scan_rxon_flags(req);
 371         cmd->filter_flags = cpu_to_le32(MAC_FILTER_ACCEPT_GRP |
 372                                         MAC_FILTER_IN_BEACON);
 373
 374         if (vif->type == NL80211_IFTYPE_P2P_DEVICE)
 375                 cmd->type = cpu_to_le32(SCAN_TYPE_DISCOVERY_FORCED);
 376         else
 377                 cmd->type = cpu_to_le32(SCAN_TYPE_FORCED);
 378
 379         cmd->repeats = cpu_to_le32(1);
 380
 381         /*
 382          * If the user asked for passive scan, don't change to active scan if
 383          * you see any activity on the channel - remain passive.
 384          */
 385         if (req->n_ssids > 0) {
 386                 cmd->passive2active = cpu_to_le16(1);
 387                 cmd->scan_flags |= SCAN_FLAGS_PASSIVE2ACTIVE;
 388                 if (basic_ssid) {
 389                         ssid = req->ssids[0].ssid;
 390                         ssid_len = req->ssids[0].ssid_len;
 391                 }
 392         } else {
 393                 cmd->passive2active = 0;
 394                 cmd->scan_flags &= ~SCAN_FLAGS_PASSIVE2ACTIVE;
 395         }
 396
 397         iwl_mvm_scan_fill_ssids(cmd, req, basic_ssid ? 1 : 0);
 398
 399         cmd->tx_cmd.tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL |
 400                                            TX_CMD_FLG_BT_DIS);
 401         cmd->tx_cmd.sta_id = mvm->aux_sta.sta_id;
 402         cmd->tx_cmd.life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
 403         cmd->tx_cmd.rate_n_flags =
 404                         iwl_mvm_scan_rate_n_flags(mvm, req->channels[0]->band,
 405                                                   req->no_cck);
 406
 407         cmd->tx_cmd.len =
 408                 cpu_to_le16(iwl_mvm_fill_probe_req(
 409                             (struct ieee80211_mgmt *)cmd->data,
 410                             vif->addr,
 411                             req->n_ssids, ssid, ssid_len,
 412                             req->ie, req->ie_len,
 413                             mvm->fw->ucode_capa.max_probe_length));
 414
 415         iwl_mvm_scan_fill_channels(cmd, req, basic_ssid, &params);
 416
 417         cmd->len = cpu_to_le16(sizeof(struct iwl_scan_cmd) +
 418                 le16_to_cpu(cmd->tx_cmd.len) +
 419                 (cmd->channel_count * sizeof(struct iwl_scan_channel)));
 420         hcmd.len[0] = le16_to_cpu(cmd->len);
 421
 422         status = SCAN_RESPONSE_OK;
 423         ret = iwl_mvm_send_cmd_status(mvm, &hcmd, &status);
 424         if (!ret && status == SCAN_RESPONSE_OK) {
 425                 IWL_DEBUG_SCAN(mvm, "Scan request was sent successfully\n");
 426         } else {
 427                 /*
 428                  * If the scan failed, it usually means that the FW was unable
 429                  * to allocate the time events. Warn on it, but maybe we
 430                  * should try to send the command again with different params.
 431                  */
 432                 IWL_ERR(mvm, "Scan failed! status 0x%x ret %d\n",
 433                         status, ret);
 434                 mvm->scan_status = IWL_MVM_SCAN_NONE;
 435                 ret = -EIO;
 436         }
 437         return ret;
 438 }
 439
 440 int iwl_mvm_rx_scan_response(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 441                           struct iwl_device_cmd *cmd)
 442 {
 443         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 444         struct iwl_cmd_response *resp = (void *)pkt->data;
 445
 446         IWL_DEBUG_SCAN(mvm, "Scan response received. status 0x%x\n",
 447                        le32_to_cpu(resp->status));
 448         return 0;
 449 }
 450
 451 int iwl_mvm_rx_scan_complete(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 452                           struct iwl_device_cmd *cmd)
 453 {
 454         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 455         struct iwl_scan_complete_notif *notif = (void *)pkt->data;
 456
 457         lockdep_assert_held(&mvm->mutex);
 458
 459         IWL_DEBUG_SCAN(mvm, "Scan complete: status=0x%x scanned channels=%d\n",
 460                        notif->status, notif->scanned_channels);
 461
 462         if (mvm->scan_status == IWL_MVM_SCAN_OS)
 463                 mvm->scan_status = IWL_MVM_SCAN_NONE;
 464         ieee80211_scan_completed(mvm->hw, notif->status != SCAN_COMP_STATUS_OK);
 465
 466         iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
 467
 468         return 0;
 469 }
 470
 471 int iwl_mvm_rx_sched_scan_results(struct iwl_mvm *mvm,
 472                                   struct iwl_rx_cmd_buffer *rxb,
 473                                   struct iwl_device_cmd *cmd)
 474 {
 475         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 476         struct iwl_sched_scan_results *notif = (void *)pkt->data;
 477
 478         if (notif->client_bitmap & SCAN_CLIENT_SCHED_SCAN) {
 479                 IWL_DEBUG_SCAN(mvm, "Scheduled scan results\n");
 480                 ieee80211_sched_scan_results(mvm->hw);
 481         }
 482
 483         return 0;
 484 }
 485
 486 static bool iwl_mvm_scan_abort_notif(struct iwl_notif_wait_data *notif_wait,
 487                                      struct iwl_rx_packet *pkt, void *data)
 488 {
 489         struct iwl_mvm *mvm =
 490                 container_of(notif_wait, struct iwl_mvm, notif_wait);
 491         struct iwl_scan_complete_notif *notif;
 492         u32 *resp;
 493
 494         switch (pkt->hdr.cmd) {
 495         case SCAN_ABORT_CMD:
 496                 resp = (void *)pkt->data;
 497                 if (*resp == CAN_ABORT_STATUS) {
 498                         IWL_DEBUG_SCAN(mvm,
 499                                        "Scan can be aborted, wait until completion\n");
 500                         return false;
 501                 }
 502
 503                 /*
 504                  * If scan cannot be aborted, it means that we had a
 505                  * SCAN_COMPLETE_NOTIFICATION in the pipe and it called
 506                  * ieee80211_scan_completed already.
 507                  */
 508                 IWL_DEBUG_SCAN(mvm, "Scan cannot be aborted, exit now: %d\n",
 509                                *resp);
 510                 return true;
 511
 512         case SCAN_COMPLETE_NOTIFICATION:
 513                 notif = (void *)pkt->data;
 514                 IWL_DEBUG_SCAN(mvm, "Scan aborted: status 0x%x\n",
 515                                notif->status);
 516                 return true;
 517
 518         default:
 519                 WARN_ON(1);
 520                 return false;
 521         };
 522 }
 523
 524 int iwl_mvm_cancel_scan(struct iwl_mvm *mvm)
 525 {
 526         struct iwl_notification_wait wait_scan_abort;
 527         static const u8 scan_abort_notif[] = { SCAN_ABORT_CMD,
 528                                                SCAN_COMPLETE_NOTIFICATION };
 529         int ret;
 530
 531         if (mvm->scan_status == IWL_MVM_SCAN_NONE)
 532                 return 0;
 533
 534         if (iwl_mvm_is_radio_killed(mvm)) {
 535                 ieee80211_scan_completed(mvm->hw, true);
 536                 iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
 537                 mvm->scan_status = IWL_MVM_SCAN_NONE;
 538                 return 0;
 539         }
 540
 541         iwl_init_notification_wait(&mvm->notif_wait, &wait_scan_abort,
 542                                    scan_abort_notif,
 543                                    ARRAY_SIZE(scan_abort_notif),
 544                                    iwl_mvm_scan_abort_notif, NULL);
 545
 546         ret = iwl_mvm_send_cmd_pdu(mvm, SCAN_ABORT_CMD, CMD_SYNC, 0, NULL);
 547         if (ret) {
 548                 IWL_ERR(mvm, "Couldn't send SCAN_ABORT_CMD: %d\n", ret);
 549                 /* mac80211's state will be cleaned in the nic_restart flow */
 550                 goto out_remove_notif;
 551         }
 552
 553         return iwl_wait_notification(&mvm->notif_wait, &wait_scan_abort, HZ);
 554
 555 out_remove_notif:
 556         iwl_remove_notification(&mvm->notif_wait, &wait_scan_abort);
 557         return ret;
 558 }
 559
 560 int iwl_mvm_rx_scan_offload_complete_notif(struct iwl_mvm *mvm,
 561                                            struct iwl_rx_cmd_buffer *rxb,
 562                                            struct iwl_device_cmd *cmd)
 563 {
 564         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 565         struct iwl_scan_offload_complete *scan_notif = (void *)pkt->data;
 566
 567         /* scan status must be locked for proper checking */
 568         lockdep_assert_held(&mvm->mutex);
 569
 570         IWL_DEBUG_SCAN(mvm, "Scheduled scan completed, status %s\n",
 571                        scan_notif->status == IWL_SCAN_OFFLOAD_COMPLETED ?
 572                        "completed" : "aborted");
 573
 574         /* only call mac80211 completion if the stop was initiated by FW */
 575         if (mvm->scan_status == IWL_MVM_SCAN_SCHED) {
 576                 mvm->scan_status = IWL_MVM_SCAN_NONE;
 577                 ieee80211_sched_scan_stopped(mvm->hw);
 578         }
 579
 580         return 0;
 581 }
 582
 583 static void iwl_scan_offload_build_tx_cmd(struct iwl_mvm *mvm,
 584                                           struct ieee80211_vif *vif,
 585                                           struct ieee80211_sched_scan_ies *ies,
 586                                           enum ieee80211_band band,
 587                                           struct iwl_tx_cmd *cmd,
 588                                           u8 *data)
 589 {
 590         u16 cmd_len;
 591
 592         cmd->tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL);
 593         cmd->life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
 594         cmd->sta_id = mvm->aux_sta.sta_id;
 595
 596         cmd->rate_n_flags = iwl_mvm_scan_rate_n_flags(mvm, band, false);
 597
 598         cmd_len = iwl_mvm_fill_probe_req((struct ieee80211_mgmt *)data,
 599                                          vif->addr,
 600                                          1, NULL, 0,
 601                                          ies->ie[band], ies->len[band],
 602                                          SCAN_OFFLOAD_PROBE_REQ_SIZE);
 603         cmd->len = cpu_to_le16(cmd_len);
 604 }
 605
 606 static void iwl_build_scan_cmd(struct iwl_mvm *mvm,
 607                                struct ieee80211_vif *vif,
 608                                struct cfg80211_sched_scan_request *req,
 609                                struct iwl_scan_offload_cmd *scan,
 610                                struct iwl_mvm_scan_params *params)
 611 {
 612         scan->channel_count =
 613                 mvm->nvm_data->bands[IEEE80211_BAND_2GHZ].n_channels +
 614                 mvm->nvm_data->bands[IEEE80211_BAND_5GHZ].n_channels;
 615         scan->quiet_time = cpu_to_le16(IWL_ACTIVE_QUIET_TIME);
 616         scan->quiet_plcp_th = cpu_to_le16(IWL_PLCP_QUIET_THRESH);
 617         scan->good_CRC_th = IWL_GOOD_CRC_TH_DEFAULT;
 618         scan->rx_chain = iwl_mvm_scan_rx_chain(mvm);
 619
 620         scan->max_out_time = cpu_to_le32(params->max_out_time);
 621         scan->suspend_time = cpu_to_le32(params->suspend_time);
 622
 623         scan->filter_flags |= cpu_to_le32(MAC_FILTER_ACCEPT_GRP |
 624                                           MAC_FILTER_IN_BEACON);
 625         scan->scan_type = cpu_to_le32(SCAN_TYPE_BACKGROUND);
 626         scan->rep_count = cpu_to_le32(1);
 627
 628         if (params->passive_fragmented)
 629                 scan->scan_flags |= SCAN_FLAGS_FRAGMENTED_SCAN;
 630 }
 631
 632 static int iwl_ssid_exist(u8 *ssid, u8 ssid_len, struct iwl_ssid_ie *ssid_list)
 633 {
 634         int i;
 635
 636         for (i = 0; i < PROBE_OPTION_MAX; i++) {
 637                 if (!ssid_list[i].len)
 638                         break;
 639                 if (ssid_list[i].len == ssid_len &&
 640                     !memcmp(ssid_list->ssid, ssid, ssid_len))
 641                         return i;
 642         }
 643         return -1;
 644 }
 645
 646 static void iwl_scan_offload_build_ssid(struct cfg80211_sched_scan_request *req,
 647                                         struct iwl_scan_offload_cmd *scan,
 648                                         u32 *ssid_bitmap)
 649 {
 650         int i, j;
 651         int index;
 652
 653         /*
 654          * copy SSIDs from match list.
 655          * iwl_config_sched_scan_profiles() uses the order of these ssids to
 656          * config match list.
 657          */
 658         for (i = 0; i < req->n_match_sets && i < PROBE_OPTION_MAX; i++) {
 659                 /* skip empty SSID matchsets */
 660                 if (!req->match_sets[i].ssid.ssid_len)
 661                         continue;
 662                 scan->direct_scan[i].id = WLAN_EID_SSID;
 663                 scan->direct_scan[i].len = req->match_sets[i].ssid.ssid_len;
 664                 memcpy(scan->direct_scan[i].ssid, req->match_sets[i].ssid.ssid,
 665                        scan->direct_scan[i].len);
 666         }
 667
 668         /* add SSIDs from scan SSID list */
 669         *ssid_bitmap = 0;
 670         for (j = 0; j < req->n_ssids && i < PROBE_OPTION_MAX; j++) {
 671                 index = iwl_ssid_exist(req->ssids[j].ssid,
 672                                        req->ssids[j].ssid_len,
 673                                        scan->direct_scan);
 674                 if (index < 0) {
 675                         if (!req->ssids[j].ssid_len)
 676                                 continue;
 677                         scan->direct_scan[i].id = WLAN_EID_SSID;
 678                         scan->direct_scan[i].len = req->ssids[j].ssid_len;
 679                         memcpy(scan->direct_scan[i].ssid, req->ssids[j].ssid,
 680                                scan->direct_scan[i].len);
 681                         *ssid_bitmap |= BIT(i + 1);
 682                         i++;
 683                 } else {
 684                         *ssid_bitmap |= BIT(index + 1);
 685                 }
 686         }
 687 }
 688
 689 static void iwl_build_channel_cfg(struct iwl_mvm *mvm,
 690                                   struct cfg80211_sched_scan_request *req,
 691                                   struct iwl_scan_channel_cfg *channels,
 692                                   enum ieee80211_band band,
 693                                   int *head, int *tail,
 694                                   u32 ssid_bitmap,
 695                                   struct iwl_mvm_scan_params *params)
 696 {
 697         struct ieee80211_supported_band *s_band;
 698         int n_channels = req->n_channels;
 699         int i, j, index = 0;
 700         bool partial;
 701
 702         /*
 703          * We have to configure all supported channels, even if we don't want to
 704          * scan on them, but we have to send channels in the order that we want
 705          * to scan. So add requested channels to head of the list and others to
 706          * the end.
 707         */
 708         s_band = &mvm->nvm_data->bands[band];
 709
 710         for (i = 0; i < s_band->n_channels && *head <= *tail; i++) {
 711                 partial = false;
 712                 for (j = 0; j < n_channels; j++)
 713                         if (s_band->channels[i].center_freq ==
 714                                                 req->channels[j]->center_freq) {
 715                                 index = *head;
 716                                 (*head)++;
 717                                 /*
 718                                  * Channels that came with the request will be
 719                                  * in partial scan .
 720                                  */
 721                                 partial = true;
 722                                 break;
 723                         }
 724                 if (!partial) {
 725                         index = *tail;
 726                         (*tail)--;
 727                 }
 728                 channels->channel_number[index] =
 729                         cpu_to_le16(ieee80211_frequency_to_channel(
 730                                         s_band->channels[i].center_freq));
 731                 channels->dwell_time[index][0] = params->dwell[band].active;
 732                 channels->dwell_time[index][1] = params->dwell[band].passive;
 733
 734                 channels->iter_count[index] = cpu_to_le16(1);
 735                 channels->iter_interval[index] = 0;
 736
 737                 if (!(s_band->channels[i].flags & IEEE80211_CHAN_NO_IR))
 738                         channels->type[index] |=
 739                                 cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_ACTIVE);
 740
 741                 channels->type[index] |=
 742                                 cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_FULL);
 743                 if (partial)
 744                         channels->type[index] |=
 745                                 cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_PARTIAL);
 746
 747                 if (s_band->channels[i].flags & IEEE80211_CHAN_NO_HT40)
 748                         channels->type[index] |=
 749                                 cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_NARROW);
 750
 751                 /* scan for all SSIDs from req->ssids */
 752                 channels->type[index] |= cpu_to_le32(ssid_bitmap);
 753         }
 754 }
 755
 756 int iwl_mvm_config_sched_scan(struct iwl_mvm *mvm,
 757                               struct ieee80211_vif *vif,
 758                               struct cfg80211_sched_scan_request *req,
 759                               struct ieee80211_sched_scan_ies *ies)
 760 {
 761         int band_2ghz = mvm->nvm_data->bands[IEEE80211_BAND_2GHZ].n_channels;
 762         int band_5ghz = mvm->nvm_data->bands[IEEE80211_BAND_5GHZ].n_channels;
 763         int head = 0;
 764         int tail = band_2ghz + band_5ghz;
 765         u32 ssid_bitmap;
 766         int cmd_len;
 767         int ret;
 768
 769         struct iwl_scan_offload_cfg *scan_cfg;
 770         struct iwl_host_cmd cmd = {
 771                 .id = SCAN_OFFLOAD_CONFIG_CMD,
 772                 .flags = CMD_SYNC,
 773         };
 774         struct iwl_mvm_scan_params params = {};
 775
 776         lockdep_assert_held(&mvm->mutex);
 777
 778         cmd_len = sizeof(struct iwl_scan_offload_cfg) +
 779                   2 * SCAN_OFFLOAD_PROBE_REQ_SIZE;
 780
 781         scan_cfg = kzalloc(cmd_len, GFP_KERNEL);
 782         if (!scan_cfg)
 783                 return -ENOMEM;
 784
 785         iwl_mvm_scan_calc_params(mvm, vif, req->n_ssids, &params);
 786         iwl_build_scan_cmd(mvm, vif, req, &scan_cfg->scan_cmd, &params);
 787         scan_cfg->scan_cmd.len = cpu_to_le16(cmd_len);
 788
 789         iwl_scan_offload_build_ssid(req, &scan_cfg->scan_cmd, &ssid_bitmap);
 790         /* build tx frames for supported bands */
 791         if (band_2ghz) {
 792                 iwl_scan_offload_build_tx_cmd(mvm, vif, ies,
 793                                               IEEE80211_BAND_2GHZ,
 794                                               &scan_cfg->scan_cmd.tx_cmd[0],
 795                                               scan_cfg->data);
 796                 iwl_build_channel_cfg(mvm, req, &scan_cfg->channel_cfg,
 797                                       IEEE80211_BAND_2GHZ, &head, &tail,
 798                                       ssid_bitmap, &params);
 799         }
 800         if (band_5ghz) {
 801                 iwl_scan_offload_build_tx_cmd(mvm, vif, ies,
 802                                               IEEE80211_BAND_5GHZ,
 803                                               &scan_cfg->scan_cmd.tx_cmd[1],
 804                                               scan_cfg->data +
 805                                                 SCAN_OFFLOAD_PROBE_REQ_SIZE);
 806                 iwl_build_channel_cfg(mvm, req, &scan_cfg->channel_cfg,
 807                                       IEEE80211_BAND_5GHZ, &head, &tail,
 808                                       ssid_bitmap, &params);
 809         }
 810
 811         cmd.data[0] = scan_cfg;
 812         cmd.len[0] = cmd_len;
 813         cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
 814
 815         IWL_DEBUG_SCAN(mvm, "Sending scheduled scan config\n");
 816
 817         ret = iwl_mvm_send_cmd(mvm, &cmd);
 818         kfree(scan_cfg);
 819         return ret;
 820 }
 821
 822 int iwl_mvm_config_sched_scan_profiles(struct iwl_mvm *mvm,
 823                                        struct cfg80211_sched_scan_request *req)
 824 {
 825         struct iwl_scan_offload_profile *profile;
 826         struct iwl_scan_offload_profile_cfg *profile_cfg;
 827         struct iwl_scan_offload_blacklist *blacklist;
 828         struct iwl_host_cmd cmd = {
 829                 .id = SCAN_OFFLOAD_UPDATE_PROFILES_CMD,
 830                 .flags = CMD_SYNC,
 831                 .len[1] = sizeof(*profile_cfg),
 832                 .dataflags[0] = IWL_HCMD_DFL_NOCOPY,
 833                 .dataflags[1] = IWL_HCMD_DFL_NOCOPY,
 834         };
 835         int blacklist_len;
 836         int i;
 837         int ret;
 838
 839         if (WARN_ON(req->n_match_sets > IWL_SCAN_MAX_PROFILES))
 840                         return -EIO;
 841
 842         if (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_SHORT_BL)
 843                 blacklist_len = IWL_SCAN_SHORT_BLACKLIST_LEN;
 844         else
 845                 blacklist_len = IWL_SCAN_MAX_BLACKLIST_LEN;
 846
 847         blacklist = kzalloc(sizeof(*blacklist) * blacklist_len, GFP_KERNEL);
 848         if (!blacklist)
 849                 return -ENOMEM;
 850
 851         profile_cfg = kzalloc(sizeof(*profile_cfg), GFP_KERNEL);
 852         if (!profile_cfg) {
 853                 ret = -ENOMEM;
 854                 goto free_blacklist;
 855         }
 856
 857         cmd.data[0] = blacklist;
 858         cmd.len[0] = sizeof(*blacklist) * blacklist_len;
 859         cmd.data[1] = profile_cfg;
 860
 861         /* No blacklist configuration */
 862
 863         profile_cfg->num_profiles = req->n_match_sets;
 864         profile_cfg->active_clients = SCAN_CLIENT_SCHED_SCAN;
 865         profile_cfg->pass_match = SCAN_CLIENT_SCHED_SCAN;
 866         profile_cfg->match_notify = SCAN_CLIENT_SCHED_SCAN;
 867         if (!req->n_match_sets || !req->match_sets[0].ssid.ssid_len)
 868                 profile_cfg->any_beacon_notify = SCAN_CLIENT_SCHED_SCAN;
 869
 870         for (i = 0; i < req->n_match_sets; i++) {
 871                 profile = &profile_cfg->profiles[i];
 872                 profile->ssid_index = i;
 873                 /* Support any cipher and auth algorithm */
 874                 profile->unicast_cipher = 0xff;
 875                 profile->auth_alg = 0xff;
 876                 profile->network_type = IWL_NETWORK_TYPE_ANY;
 877                 profile->band_selection = IWL_SCAN_OFFLOAD_SELECT_ANY;
 878                 profile->client_bitmap = SCAN_CLIENT_SCHED_SCAN;
 879         }
 880
 881         IWL_DEBUG_SCAN(mvm, "Sending scheduled scan profile config\n");
 882
 883         ret = iwl_mvm_send_cmd(mvm, &cmd);
 884         kfree(profile_cfg);
 885 free_blacklist:
 886         kfree(blacklist);
 887
 888         return ret;
 889 }
 890
 891 int iwl_mvm_sched_scan_start(struct iwl_mvm *mvm,
 892                              struct cfg80211_sched_scan_request *req)
 893 {
 894         struct iwl_scan_offload_req scan_req = {
 895                 .watchdog = IWL_SCHED_SCAN_WATCHDOG,
 896
 897                 .schedule_line[0].iterations = IWL_FAST_SCHED_SCAN_ITERATIONS,
 898                 .schedule_line[0].delay = req->interval / 1000,
 899                 .schedule_line[0].full_scan_mul = 1,
 900
 901                 .schedule_line[1].iterations = 0xff,
 902                 .schedule_line[1].delay = req->interval / 1000,
 903                 .schedule_line[1].full_scan_mul = IWL_FULL_SCAN_MULTIPLIER,
 904         };
 905
 906         if (req->n_match_sets && req->match_sets[0].ssid.ssid_len) {
 907                 IWL_DEBUG_SCAN(mvm,
 908                                "Sending scheduled scan with filtering, filter len %d\n",
 909                                req->n_match_sets);
 910         } else {
 911                 IWL_DEBUG_SCAN(mvm,
 912                                "Sending Scheduled scan without filtering\n");
 913                 scan_req.flags |= cpu_to_le16(IWL_SCAN_OFFLOAD_FLAG_PASS_ALL);
 914         }
 915
 916         return iwl_mvm_send_cmd_pdu(mvm, SCAN_OFFLOAD_REQUEST_CMD, CMD_SYNC,
 917                                     sizeof(scan_req), &scan_req);
 918 }
 919
 920 static int iwl_mvm_send_sched_scan_abort(struct iwl_mvm *mvm)
 921 {
 922         int ret;
 923         struct iwl_host_cmd cmd = {
 924                 .id = SCAN_OFFLOAD_ABORT_CMD,
 925                 .flags = CMD_SYNC,
 926         };
 927         u32 status;
 928
 929         /* Exit instantly with error when device is not ready
 930          * to receive scan abort command or it does not perform
 931          * scheduled scan currently */
 932         if (mvm->scan_status != IWL_MVM_SCAN_SCHED)
 933                 return -EIO;
 934
 935         ret = iwl_mvm_send_cmd_status(mvm, &cmd, &status);
 936         if (ret)
 937                 return ret;
 938
 939         if (status != CAN_ABORT_STATUS) {
 940                 /*
 941                  * The scan abort will return 1 for success or
 942                  * 2 for "failure".  A failure condition can be
 943                  * due to simply not being in an active scan which
 944                  * can occur if we send the scan abort before the
 945                  * microcode has notified us that a scan is completed.
 946                  */
 947                 IWL_DEBUG_SCAN(mvm, "SCAN OFFLOAD ABORT ret %d.\n", status);
 948                 ret = -ENOENT;
 949         }
 950
 951         return ret;
 952 }
 953
 954 int iwl_mvm_sched_scan_stop(struct iwl_mvm *mvm)
 955 {
 956         int ret;
 957         struct iwl_notification_wait wait_scan_done;
 958         static const u8 scan_done_notif[] = { SCAN_OFFLOAD_COMPLETE, };
 959
 960         lockdep_assert_held(&mvm->mutex);
 961
 962         if (mvm->scan_status != IWL_MVM_SCAN_SCHED) {
 963                 IWL_DEBUG_SCAN(mvm, "No offloaded scan to stop\n");
 964                 return 0;
 965         }
 966
 967         iwl_init_notification_wait(&mvm->notif_wait, &wait_scan_done,
 968                                    scan_done_notif,
 969                                    ARRAY_SIZE(scan_done_notif),
 970                                    NULL, NULL);
 971
 972         ret = iwl_mvm_send_sched_scan_abort(mvm);
 973         if (ret) {
 974                 IWL_DEBUG_SCAN(mvm, "Send stop offload scan failed %d\n", ret);
 975                 iwl_remove_notification(&mvm->notif_wait, &wait_scan_done);
 976                 return ret;
 977         }
 978
 979         IWL_DEBUG_SCAN(mvm, "Successfully sent stop offload scan\n");
 980
 981         ret = iwl_wait_notification(&mvm->notif_wait, &wait_scan_done, 1 * HZ);
 982         if (ret)
 983                 return ret;
 984
 985         /*
 986          * Clear the scan status so the next scan requests will succeed. This
 987          * also ensures the Rx handler doesn't do anything, as the scan was
 988          * stopped from above.
 989          */
 990         mvm->scan_status = IWL_MVM_SCAN_NONE;
 991
 992         return 0;
 993 }