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

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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                 .dataflags = { IWL_HCMD_DFL_NOCOPY, },
 310         };
 311         struct iwl_scan_cmd *cmd = mvm->scan_cmd;
 312         int ret;
 313         u32 status;
 314         int ssid_len = 0;
 315         u8 *ssid = NULL;
 316         bool basic_ssid = !(mvm->fw->ucode_capa.flags &
 317                            IWL_UCODE_TLV_FLAGS_NO_BASIC_SSID);
 318         struct iwl_mvm_scan_params params = {};
 319
 320         lockdep_assert_held(&mvm->mutex);
 321
 322         /* we should have failed registration if scan_cmd was NULL */
 323         if (WARN_ON(mvm->scan_cmd == NULL))
 324                 return -ENOMEM;
 325
 326         IWL_DEBUG_SCAN(mvm, "Handling mac80211 scan request\n");
 327         mvm->scan_status = IWL_MVM_SCAN_OS;
 328         memset(cmd, 0, sizeof(struct iwl_scan_cmd) +
 329                mvm->fw->ucode_capa.max_probe_length +
 330                (MAX_NUM_SCAN_CHANNELS * sizeof(struct iwl_scan_channel)));
 331
 332         cmd->channel_count = (u8)req->n_channels;
 333         cmd->quiet_time = cpu_to_le16(IWL_ACTIVE_QUIET_TIME);
 334         cmd->quiet_plcp_th = cpu_to_le16(IWL_PLCP_QUIET_THRESH);
 335         cmd->rxchain_sel_flags = iwl_mvm_scan_rx_chain(mvm);
 336
 337         iwl_mvm_scan_calc_params(mvm, vif, req->n_ssids, &params);
 338         cmd->max_out_time = cpu_to_le32(params.max_out_time);
 339         cmd->suspend_time = cpu_to_le32(params.suspend_time);
 340         if (params.passive_fragmented)
 341                 cmd->scan_flags |= SCAN_FLAGS_FRAGMENTED_SCAN;
 342
 343         cmd->rxon_flags = iwl_mvm_scan_rxon_flags(req);
 344         cmd->filter_flags = cpu_to_le32(MAC_FILTER_ACCEPT_GRP |
 345                                         MAC_FILTER_IN_BEACON);
 346
 347         if (vif->type == NL80211_IFTYPE_P2P_DEVICE)
 348                 cmd->type = cpu_to_le32(SCAN_TYPE_DISCOVERY_FORCED);
 349         else
 350                 cmd->type = cpu_to_le32(SCAN_TYPE_FORCED);
 351
 352         cmd->repeats = cpu_to_le32(1);
 353
 354         /*
 355          * If the user asked for passive scan, don't change to active scan if
 356          * you see any activity on the channel - remain passive.
 357          */
 358         if (req->n_ssids > 0) {
 359                 cmd->passive2active = cpu_to_le16(1);
 360                 cmd->scan_flags |= SCAN_FLAGS_PASSIVE2ACTIVE;
 361                 if (basic_ssid) {
 362                         ssid = req->ssids[0].ssid;
 363                         ssid_len = req->ssids[0].ssid_len;
 364                 }
 365         } else {
 366                 cmd->passive2active = 0;
 367                 cmd->scan_flags &= ~SCAN_FLAGS_PASSIVE2ACTIVE;
 368         }
 369
 370         iwl_mvm_scan_fill_ssids(cmd, req, basic_ssid ? 1 : 0);
 371
 372         cmd->tx_cmd.tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL |
 373                                            TX_CMD_FLG_BT_DIS);
 374         cmd->tx_cmd.sta_id = mvm->aux_sta.sta_id;
 375         cmd->tx_cmd.life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
 376         cmd->tx_cmd.rate_n_flags =
 377                         iwl_mvm_scan_rate_n_flags(mvm, req->channels[0]->band,
 378                                                   req->no_cck);
 379
 380         cmd->tx_cmd.len =
 381                 cpu_to_le16(iwl_mvm_fill_probe_req(
 382                             (struct ieee80211_mgmt *)cmd->data,
 383                             vif->addr,
 384                             req->n_ssids, ssid, ssid_len,
 385                             req->ie, req->ie_len,
 386                             mvm->fw->ucode_capa.max_probe_length));
 387
 388         iwl_mvm_scan_fill_channels(cmd, req, basic_ssid, &params);
 389
 390         cmd->len = cpu_to_le16(sizeof(struct iwl_scan_cmd) +
 391                 le16_to_cpu(cmd->tx_cmd.len) +
 392                 (cmd->channel_count * sizeof(struct iwl_scan_channel)));
 393         hcmd.len[0] = le16_to_cpu(cmd->len);
 394
 395         status = SCAN_RESPONSE_OK;
 396         ret = iwl_mvm_send_cmd_status(mvm, &hcmd, &status);
 397         if (!ret && status == SCAN_RESPONSE_OK) {
 398                 IWL_DEBUG_SCAN(mvm, "Scan request was sent successfully\n");
 399         } else {
 400                 /*
 401                  * If the scan failed, it usually means that the FW was unable
 402                  * to allocate the time events. Warn on it, but maybe we
 403                  * should try to send the command again with different params.
 404                  */
 405                 IWL_ERR(mvm, "Scan failed! status 0x%x ret %d\n",
 406                         status, ret);
 407                 mvm->scan_status = IWL_MVM_SCAN_NONE;
 408                 ret = -EIO;
 409         }
 410         return ret;
 411 }
 412
 413 int iwl_mvm_rx_scan_response(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 414                           struct iwl_device_cmd *cmd)
 415 {
 416         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 417         struct iwl_cmd_response *resp = (void *)pkt->data;
 418
 419         IWL_DEBUG_SCAN(mvm, "Scan response received. status 0x%x\n",
 420                        le32_to_cpu(resp->status));
 421         return 0;
 422 }
 423
 424 int iwl_mvm_rx_scan_complete(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 425                           struct iwl_device_cmd *cmd)
 426 {
 427         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 428         struct iwl_scan_complete_notif *notif = (void *)pkt->data;
 429
 430         lockdep_assert_held(&mvm->mutex);
 431
 432         IWL_DEBUG_SCAN(mvm, "Scan complete: status=0x%x scanned channels=%d\n",
 433                        notif->status, notif->scanned_channels);
 434
 435         if (mvm->scan_status == IWL_MVM_SCAN_OS)
 436                 mvm->scan_status = IWL_MVM_SCAN_NONE;
 437         ieee80211_scan_completed(mvm->hw, notif->status != SCAN_COMP_STATUS_OK);
 438
 439         iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
 440
 441         return 0;
 442 }
 443
 444 int iwl_mvm_rx_sched_scan_results(struct iwl_mvm *mvm,
 445                                   struct iwl_rx_cmd_buffer *rxb,
 446                                   struct iwl_device_cmd *cmd)
 447 {
 448         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 449         struct iwl_sched_scan_results *notif = (void *)pkt->data;
 450
 451         if (notif->client_bitmap & SCAN_CLIENT_SCHED_SCAN) {
 452                 IWL_DEBUG_SCAN(mvm, "Scheduled scan results\n");
 453                 ieee80211_sched_scan_results(mvm->hw);
 454         }
 455
 456         return 0;
 457 }
 458
 459 static bool iwl_mvm_scan_abort_notif(struct iwl_notif_wait_data *notif_wait,
 460                                      struct iwl_rx_packet *pkt, void *data)
 461 {
 462         struct iwl_mvm *mvm =
 463                 container_of(notif_wait, struct iwl_mvm, notif_wait);
 464         struct iwl_scan_complete_notif *notif;
 465         u32 *resp;
 466
 467         switch (pkt->hdr.cmd) {
 468         case SCAN_ABORT_CMD:
 469                 resp = (void *)pkt->data;
 470                 if (*resp == CAN_ABORT_STATUS) {
 471                         IWL_DEBUG_SCAN(mvm,
 472                                        "Scan can be aborted, wait until completion\n");
 473                         return false;
 474                 }
 475
 476                 /*
 477                  * If scan cannot be aborted, it means that we had a
 478                  * SCAN_COMPLETE_NOTIFICATION in the pipe and it called
 479                  * ieee80211_scan_completed already.
 480                  */
 481                 IWL_DEBUG_SCAN(mvm, "Scan cannot be aborted, exit now: %d\n",
 482                                *resp);
 483                 return true;
 484
 485         case SCAN_COMPLETE_NOTIFICATION:
 486                 notif = (void *)pkt->data;
 487                 IWL_DEBUG_SCAN(mvm, "Scan aborted: status 0x%x\n",
 488                                notif->status);
 489                 return true;
 490
 491         default:
 492                 WARN_ON(1);
 493                 return false;
 494         };
 495 }
 496
 497 int iwl_mvm_cancel_scan(struct iwl_mvm *mvm)
 498 {
 499         struct iwl_notification_wait wait_scan_abort;
 500         static const u8 scan_abort_notif[] = { SCAN_ABORT_CMD,
 501                                                SCAN_COMPLETE_NOTIFICATION };
 502         int ret;
 503
 504         if (mvm->scan_status == IWL_MVM_SCAN_NONE)
 505                 return 0;
 506
 507         if (iwl_mvm_is_radio_killed(mvm)) {
 508                 ieee80211_scan_completed(mvm->hw, true);
 509                 iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
 510                 mvm->scan_status = IWL_MVM_SCAN_NONE;
 511                 return 0;
 512         }
 513
 514         iwl_init_notification_wait(&mvm->notif_wait, &wait_scan_abort,
 515                                    scan_abort_notif,
 516                                    ARRAY_SIZE(scan_abort_notif),
 517                                    iwl_mvm_scan_abort_notif, NULL);
 518
 519         ret = iwl_mvm_send_cmd_pdu(mvm, SCAN_ABORT_CMD, 0, 0, NULL);
 520         if (ret) {
 521                 IWL_ERR(mvm, "Couldn't send SCAN_ABORT_CMD: %d\n", ret);
 522                 /* mac80211's state will be cleaned in the nic_restart flow */
 523                 goto out_remove_notif;
 524         }
 525
 526         return iwl_wait_notification(&mvm->notif_wait, &wait_scan_abort, HZ);
 527
 528 out_remove_notif:
 529         iwl_remove_notification(&mvm->notif_wait, &wait_scan_abort);
 530         return ret;
 531 }
 532
 533 int iwl_mvm_rx_scan_offload_complete_notif(struct iwl_mvm *mvm,
 534                                            struct iwl_rx_cmd_buffer *rxb,
 535                                            struct iwl_device_cmd *cmd)
 536 {
 537         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 538         struct iwl_scan_offload_complete *scan_notif = (void *)pkt->data;
 539
 540         /* scan status must be locked for proper checking */
 541         lockdep_assert_held(&mvm->mutex);
 542
 543         IWL_DEBUG_SCAN(mvm,
 544                        "Scheduled scan completed, status %s EBS status %s:%d\n",
 545                        scan_notif->status == IWL_SCAN_OFFLOAD_COMPLETED ?
 546                        "completed" : "aborted", scan_notif->ebs_status ==
 547                        IWL_SCAN_EBS_SUCCESS ? "success" : "failed",
 548                        scan_notif->ebs_status);
 549
 550
 551         /* only call mac80211 completion if the stop was initiated by FW */
 552         if (mvm->scan_status == IWL_MVM_SCAN_SCHED) {
 553                 mvm->scan_status = IWL_MVM_SCAN_NONE;
 554                 ieee80211_sched_scan_stopped(mvm->hw);
 555         }
 556
 557         mvm->last_ebs_successful = !scan_notif->ebs_status;
 558
 559         return 0;
 560 }
 561
 562 static void iwl_scan_offload_build_tx_cmd(struct iwl_mvm *mvm,
 563                                           struct ieee80211_vif *vif,
 564                                           struct ieee80211_sched_scan_ies *ies,
 565                                           enum ieee80211_band band,
 566                                           struct iwl_tx_cmd *cmd,
 567                                           u8 *data)
 568 {
 569         u16 cmd_len;
 570
 571         cmd->tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL);
 572         cmd->life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
 573         cmd->sta_id = mvm->aux_sta.sta_id;
 574
 575         cmd->rate_n_flags = iwl_mvm_scan_rate_n_flags(mvm, band, false);
 576
 577         cmd_len = iwl_mvm_fill_probe_req((struct ieee80211_mgmt *)data,
 578                                          vif->addr,
 579                                          1, NULL, 0,
 580                                          ies->ie[band], ies->len[band],
 581                                          SCAN_OFFLOAD_PROBE_REQ_SIZE);
 582         cmd->len = cpu_to_le16(cmd_len);
 583 }
 584
 585 static void iwl_build_scan_cmd(struct iwl_mvm *mvm,
 586                                struct ieee80211_vif *vif,
 587                                struct cfg80211_sched_scan_request *req,
 588                                struct iwl_scan_offload_cmd *scan,
 589                                struct iwl_mvm_scan_params *params)
 590 {
 591         scan->channel_count = req->n_channels;
 592         scan->quiet_time = cpu_to_le16(IWL_ACTIVE_QUIET_TIME);
 593         scan->quiet_plcp_th = cpu_to_le16(IWL_PLCP_QUIET_THRESH);
 594         scan->good_CRC_th = IWL_GOOD_CRC_TH_DEFAULT;
 595         scan->rx_chain = iwl_mvm_scan_rx_chain(mvm);
 596
 597         scan->max_out_time = cpu_to_le32(params->max_out_time);
 598         scan->suspend_time = cpu_to_le32(params->suspend_time);
 599
 600         scan->filter_flags |= cpu_to_le32(MAC_FILTER_ACCEPT_GRP |
 601                                           MAC_FILTER_IN_BEACON);
 602         scan->scan_type = cpu_to_le32(SCAN_TYPE_BACKGROUND);
 603         scan->rep_count = cpu_to_le32(1);
 604
 605         if (params->passive_fragmented)
 606                 scan->scan_flags |= SCAN_FLAGS_FRAGMENTED_SCAN;
 607 }
 608
 609 static int iwl_ssid_exist(u8 *ssid, u8 ssid_len, struct iwl_ssid_ie *ssid_list)
 610 {
 611         int i;
 612
 613         for (i = 0; i < PROBE_OPTION_MAX; i++) {
 614                 if (!ssid_list[i].len)
 615                         break;
 616                 if (ssid_list[i].len == ssid_len &&
 617                     !memcmp(ssid_list->ssid, ssid, ssid_len))
 618                         return i;
 619         }
 620         return -1;
 621 }
 622
 623 static void iwl_scan_offload_build_ssid(struct cfg80211_sched_scan_request *req,
 624                                         struct iwl_scan_offload_cmd *scan,
 625                                         u32 *ssid_bitmap)
 626 {
 627         int i, j;
 628         int index;
 629
 630         /*
 631          * copy SSIDs from match list.
 632          * iwl_config_sched_scan_profiles() uses the order of these ssids to
 633          * config match list.
 634          */
 635         for (i = 0; i < req->n_match_sets && i < PROBE_OPTION_MAX; i++) {
 636                 /* skip empty SSID matchsets */
 637                 if (!req->match_sets[i].ssid.ssid_len)
 638                         continue;
 639                 scan->direct_scan[i].id = WLAN_EID_SSID;
 640                 scan->direct_scan[i].len = req->match_sets[i].ssid.ssid_len;
 641                 memcpy(scan->direct_scan[i].ssid, req->match_sets[i].ssid.ssid,
 642                        scan->direct_scan[i].len);
 643         }
 644
 645         /* add SSIDs from scan SSID list */
 646         *ssid_bitmap = 0;
 647         for (j = 0; j < req->n_ssids && i < PROBE_OPTION_MAX; j++) {
 648                 index = iwl_ssid_exist(req->ssids[j].ssid,
 649                                        req->ssids[j].ssid_len,
 650                                        scan->direct_scan);
 651                 if (index < 0) {
 652                         if (!req->ssids[j].ssid_len)
 653                                 continue;
 654                         scan->direct_scan[i].id = WLAN_EID_SSID;
 655                         scan->direct_scan[i].len = req->ssids[j].ssid_len;
 656                         memcpy(scan->direct_scan[i].ssid, req->ssids[j].ssid,
 657                                scan->direct_scan[i].len);
 658                         *ssid_bitmap |= BIT(i + 1);
 659                         i++;
 660                 } else {
 661                         *ssid_bitmap |= BIT(index + 1);
 662                 }
 663         }
 664 }
 665
 666 static void iwl_build_channel_cfg(struct iwl_mvm *mvm,
 667                                   struct cfg80211_sched_scan_request *req,
 668                                   struct iwl_scan_channel_cfg *channels,
 669                                   enum ieee80211_band band,
 670                                   int *head,
 671                                   u32 ssid_bitmap,
 672                                   struct iwl_mvm_scan_params *params)
 673 {
 674         int i, index = 0;
 675
 676         for (i = 0; i < req->n_channels; i++) {
 677                 struct ieee80211_channel *chan = req->channels[i];
 678
 679                 if (chan->band != band)
 680                         continue;
 681
 682                 index = *head;
 683                 (*head)++;
 684
 685                 channels->channel_number[index] = cpu_to_le16(chan->hw_value);
 686                 channels->dwell_time[index][0] = params->dwell[band].active;
 687                 channels->dwell_time[index][1] = params->dwell[band].passive;
 688
 689                 channels->iter_count[index] = cpu_to_le16(1);
 690                 channels->iter_interval[index] = 0;
 691
 692                 if (!(chan->flags & IEEE80211_CHAN_NO_IR))
 693                         channels->type[index] |=
 694                                 cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_ACTIVE);
 695
 696                 channels->type[index] |=
 697                                 cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_FULL |
 698                                             IWL_SCAN_OFFLOAD_CHANNEL_PARTIAL);
 699
 700                 if (chan->flags & IEEE80211_CHAN_NO_HT40)
 701                         channels->type[index] |=
 702                                 cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_NARROW);
 703
 704                 /* scan for all SSIDs from req->ssids */
 705                 channels->type[index] |= cpu_to_le32(ssid_bitmap);
 706         }
 707 }
 708
 709 int iwl_mvm_config_sched_scan(struct iwl_mvm *mvm,
 710                               struct ieee80211_vif *vif,
 711                               struct cfg80211_sched_scan_request *req,
 712                               struct ieee80211_sched_scan_ies *ies)
 713 {
 714         int band_2ghz = mvm->nvm_data->bands[IEEE80211_BAND_2GHZ].n_channels;
 715         int band_5ghz = mvm->nvm_data->bands[IEEE80211_BAND_5GHZ].n_channels;
 716         int head = 0;
 717         u32 ssid_bitmap;
 718         int cmd_len;
 719         int ret;
 720
 721         struct iwl_scan_offload_cfg *scan_cfg;
 722         struct iwl_host_cmd cmd = {
 723                 .id = SCAN_OFFLOAD_CONFIG_CMD,
 724         };
 725         struct iwl_mvm_scan_params params = {};
 726
 727         lockdep_assert_held(&mvm->mutex);
 728
 729         cmd_len = sizeof(struct iwl_scan_offload_cfg) +
 730                   2 * SCAN_OFFLOAD_PROBE_REQ_SIZE;
 731
 732         scan_cfg = kzalloc(cmd_len, GFP_KERNEL);
 733         if (!scan_cfg)
 734                 return -ENOMEM;
 735
 736         iwl_mvm_scan_calc_params(mvm, vif, req->n_ssids, &params);
 737         iwl_build_scan_cmd(mvm, vif, req, &scan_cfg->scan_cmd, &params);
 738         scan_cfg->scan_cmd.len = cpu_to_le16(cmd_len);
 739
 740         iwl_scan_offload_build_ssid(req, &scan_cfg->scan_cmd, &ssid_bitmap);
 741         /* build tx frames for supported bands */
 742         if (band_2ghz) {
 743                 iwl_scan_offload_build_tx_cmd(mvm, vif, ies,
 744                                               IEEE80211_BAND_2GHZ,
 745                                               &scan_cfg->scan_cmd.tx_cmd[0],
 746                                               scan_cfg->data);
 747                 iwl_build_channel_cfg(mvm, req, &scan_cfg->channel_cfg,
 748                                       IEEE80211_BAND_2GHZ, &head,
 749                                       ssid_bitmap, &params);
 750         }
 751         if (band_5ghz) {
 752                 iwl_scan_offload_build_tx_cmd(mvm, vif, ies,
 753                                               IEEE80211_BAND_5GHZ,
 754                                               &scan_cfg->scan_cmd.tx_cmd[1],
 755                                               scan_cfg->data +
 756                                                 SCAN_OFFLOAD_PROBE_REQ_SIZE);
 757                 iwl_build_channel_cfg(mvm, req, &scan_cfg->channel_cfg,
 758                                       IEEE80211_BAND_5GHZ, &head,
 759                                       ssid_bitmap, &params);
 760         }
 761
 762         cmd.data[0] = scan_cfg;
 763         cmd.len[0] = cmd_len;
 764         cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
 765
 766         IWL_DEBUG_SCAN(mvm, "Sending scheduled scan config\n");
 767
 768         ret = iwl_mvm_send_cmd(mvm, &cmd);
 769         kfree(scan_cfg);
 770         return ret;
 771 }
 772
 773 int iwl_mvm_config_sched_scan_profiles(struct iwl_mvm *mvm,
 774                                        struct cfg80211_sched_scan_request *req)
 775 {
 776         struct iwl_scan_offload_profile *profile;
 777         struct iwl_scan_offload_profile_cfg *profile_cfg;
 778         struct iwl_scan_offload_blacklist *blacklist;
 779         struct iwl_host_cmd cmd = {
 780                 .id = SCAN_OFFLOAD_UPDATE_PROFILES_CMD,
 781                 .len[1] = sizeof(*profile_cfg),
 782                 .dataflags[0] = IWL_HCMD_DFL_NOCOPY,
 783                 .dataflags[1] = IWL_HCMD_DFL_NOCOPY,
 784         };
 785         int blacklist_len;
 786         int i;
 787         int ret;
 788
 789         if (WARN_ON(req->n_match_sets > IWL_SCAN_MAX_PROFILES))
 790                         return -EIO;
 791
 792         if (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_SHORT_BL)
 793                 blacklist_len = IWL_SCAN_SHORT_BLACKLIST_LEN;
 794         else
 795                 blacklist_len = IWL_SCAN_MAX_BLACKLIST_LEN;
 796
 797         blacklist = kzalloc(sizeof(*blacklist) * blacklist_len, GFP_KERNEL);
 798         if (!blacklist)
 799                 return -ENOMEM;
 800
 801         profile_cfg = kzalloc(sizeof(*profile_cfg), GFP_KERNEL);
 802         if (!profile_cfg) {
 803                 ret = -ENOMEM;
 804                 goto free_blacklist;
 805         }
 806
 807         cmd.data[0] = blacklist;
 808         cmd.len[0] = sizeof(*blacklist) * blacklist_len;
 809         cmd.data[1] = profile_cfg;
 810
 811         /* No blacklist configuration */
 812
 813         profile_cfg->num_profiles = req->n_match_sets;
 814         profile_cfg->active_clients = SCAN_CLIENT_SCHED_SCAN;
 815         profile_cfg->pass_match = SCAN_CLIENT_SCHED_SCAN;
 816         profile_cfg->match_notify = SCAN_CLIENT_SCHED_SCAN;
 817         if (!req->n_match_sets || !req->match_sets[0].ssid.ssid_len)
 818                 profile_cfg->any_beacon_notify = SCAN_CLIENT_SCHED_SCAN;
 819
 820         for (i = 0; i < req->n_match_sets; i++) {
 821                 profile = &profile_cfg->profiles[i];
 822                 profile->ssid_index = i;
 823                 /* Support any cipher and auth algorithm */
 824                 profile->unicast_cipher = 0xff;
 825                 profile->auth_alg = 0xff;
 826                 profile->network_type = IWL_NETWORK_TYPE_ANY;
 827                 profile->band_selection = IWL_SCAN_OFFLOAD_SELECT_ANY;
 828                 profile->client_bitmap = SCAN_CLIENT_SCHED_SCAN;
 829         }
 830
 831         IWL_DEBUG_SCAN(mvm, "Sending scheduled scan profile config\n");
 832
 833         ret = iwl_mvm_send_cmd(mvm, &cmd);
 834         kfree(profile_cfg);
 835 free_blacklist:
 836         kfree(blacklist);
 837
 838         return ret;
 839 }
 840
 841 int iwl_mvm_sched_scan_start(struct iwl_mvm *mvm,
 842                              struct cfg80211_sched_scan_request *req)
 843 {
 844         struct iwl_scan_offload_req scan_req = {
 845                 .watchdog = IWL_SCHED_SCAN_WATCHDOG,
 846
 847                 .schedule_line[0].iterations = IWL_FAST_SCHED_SCAN_ITERATIONS,
 848                 .schedule_line[0].delay = req->interval / 1000,
 849                 .schedule_line[0].full_scan_mul = 1,
 850
 851                 .schedule_line[1].iterations = 0xff,
 852                 .schedule_line[1].delay = req->interval / 1000,
 853                 .schedule_line[1].full_scan_mul = IWL_FULL_SCAN_MULTIPLIER,
 854         };
 855
 856         if (req->n_match_sets && req->match_sets[0].ssid.ssid_len) {
 857                 IWL_DEBUG_SCAN(mvm,
 858                                "Sending scheduled scan with filtering, filter len %d\n",
 859                                req->n_match_sets);
 860         } else {
 861                 IWL_DEBUG_SCAN(mvm,
 862                                "Sending Scheduled scan without filtering\n");
 863                 scan_req.flags |= cpu_to_le16(IWL_SCAN_OFFLOAD_FLAG_PASS_ALL);
 864         }
 865
 866         if (mvm->last_ebs_successful &&
 867             mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_EBS_SUPPORT)
 868                 scan_req.flags |=
 869                         cpu_to_le16(IWL_SCAN_OFFLOAD_FLAG_EBS_ACCURATE_MODE);
 870
 871         return iwl_mvm_send_cmd_pdu(mvm, SCAN_OFFLOAD_REQUEST_CMD, 0,
 872                                     sizeof(scan_req), &scan_req);
 873 }
 874
 875 static int iwl_mvm_send_sched_scan_abort(struct iwl_mvm *mvm)
 876 {
 877         int ret;
 878         struct iwl_host_cmd cmd = {
 879                 .id = SCAN_OFFLOAD_ABORT_CMD,
 880         };
 881         u32 status;
 882
 883         /* Exit instantly with error when device is not ready
 884          * to receive scan abort command or it does not perform
 885          * scheduled scan currently */
 886         if (mvm->scan_status != IWL_MVM_SCAN_SCHED)
 887                 return -EIO;
 888
 889         ret = iwl_mvm_send_cmd_status(mvm, &cmd, &status);
 890         if (ret)
 891                 return ret;
 892
 893         if (status != CAN_ABORT_STATUS) {
 894                 /*
 895                  * The scan abort will return 1 for success or
 896                  * 2 for "failure".  A failure condition can be
 897                  * due to simply not being in an active scan which
 898                  * can occur if we send the scan abort before the
 899                  * microcode has notified us that a scan is completed.
 900                  */
 901                 IWL_DEBUG_SCAN(mvm, "SCAN OFFLOAD ABORT ret %d.\n", status);
 902                 ret = -ENOENT;
 903         }
 904
 905         return ret;
 906 }
 907
 908 int iwl_mvm_sched_scan_stop(struct iwl_mvm *mvm, bool notify)
 909 {
 910         int ret;
 911         struct iwl_notification_wait wait_scan_done;
 912         static const u8 scan_done_notif[] = { SCAN_OFFLOAD_COMPLETE, };
 913
 914         lockdep_assert_held(&mvm->mutex);
 915
 916         if (mvm->scan_status != IWL_MVM_SCAN_SCHED) {
 917                 IWL_DEBUG_SCAN(mvm, "No offloaded scan to stop\n");
 918                 return 0;
 919         }
 920
 921         iwl_init_notification_wait(&mvm->notif_wait, &wait_scan_done,
 922                                    scan_done_notif,
 923                                    ARRAY_SIZE(scan_done_notif),
 924                                    NULL, NULL);
 925
 926         ret = iwl_mvm_send_sched_scan_abort(mvm);
 927         if (ret) {
 928                 IWL_DEBUG_SCAN(mvm, "Send stop offload scan failed %d\n", ret);
 929                 iwl_remove_notification(&mvm->notif_wait, &wait_scan_done);
 930                 return ret;
 931         }
 932
 933         IWL_DEBUG_SCAN(mvm, "Successfully sent stop offload scan\n");
 934
 935         ret = iwl_wait_notification(&mvm->notif_wait, &wait_scan_done, 1 * HZ);
 936         if (ret)
 937                 return ret;
 938
 939         /*
 940          * Clear the scan status so the next scan requests will succeed. This
 941          * also ensures the Rx handler doesn't do anything, as the scan was
 942          * stopped from above.
 943          */
 944         mvm->scan_status = IWL_MVM_SCAN_NONE;
 945
 946         if (notify)
 947                 ieee80211_sched_scan_stopped(mvm->hw);
 948
 949         return 0;
 950 }