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

   1 /******************************************************************************
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  51  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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  53  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  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 #define LONG_OUT_TIME_PERIOD 600
  74 #define SHORT_OUT_TIME_PERIOD 200
  75 #define SUSPEND_TIME_PERIOD 100
  76
  77 static inline __le16 iwl_mvm_scan_rx_chain(struct iwl_mvm *mvm)
  78 {
  79         u16 rx_chain;
  80         u8 rx_ant;
  81
  82         if (mvm->scan_rx_ant != ANT_NONE)
  83                 rx_ant = mvm->scan_rx_ant;
  84         else
  85                 rx_ant = iwl_fw_valid_rx_ant(mvm->fw);
  86         rx_chain = rx_ant << PHY_RX_CHAIN_VALID_POS;
  87         rx_chain |= rx_ant << PHY_RX_CHAIN_FORCE_MIMO_SEL_POS;
  88         rx_chain |= rx_ant << PHY_RX_CHAIN_FORCE_SEL_POS;
  89         rx_chain |= 0x1 << PHY_RX_CHAIN_DRIVER_FORCE_POS;
  90         return cpu_to_le16(rx_chain);
  91 }
  92
  93 static inline __le32 iwl_mvm_scan_max_out_time(struct ieee80211_vif *vif,
  94                                                u32 flags, bool is_assoc)
  95 {
  96         if (!is_assoc)
  97                 return 0;
  98         if (flags & NL80211_SCAN_FLAG_LOW_PRIORITY)
  99                 return cpu_to_le32(ieee80211_tu_to_usec(SHORT_OUT_TIME_PERIOD));
 100         return cpu_to_le32(ieee80211_tu_to_usec(LONG_OUT_TIME_PERIOD));
 101 }
 102
 103 static inline __le32 iwl_mvm_scan_suspend_time(struct ieee80211_vif *vif,
 104                                                bool is_assoc)
 105 {
 106         if (!is_assoc)
 107                 return 0;
 108         return cpu_to_le32(ieee80211_tu_to_usec(SUSPEND_TIME_PERIOD));
 109 }
 110
 111 static inline __le32
 112 iwl_mvm_scan_rxon_flags(struct cfg80211_scan_request *req)
 113 {
 114         if (req->channels[0]->band == IEEE80211_BAND_2GHZ)
 115                 return cpu_to_le32(PHY_BAND_24);
 116         else
 117                 return cpu_to_le32(PHY_BAND_5);
 118 }
 119
 120 static inline __le32
 121 iwl_mvm_scan_rate_n_flags(struct iwl_mvm *mvm, enum ieee80211_band band,
 122                           bool no_cck)
 123 {
 124         u32 tx_ant;
 125
 126         mvm->scan_last_antenna_idx =
 127                 iwl_mvm_next_antenna(mvm, iwl_fw_valid_tx_ant(mvm->fw),
 128                                      mvm->scan_last_antenna_idx);
 129         tx_ant = BIT(mvm->scan_last_antenna_idx) << RATE_MCS_ANT_POS;
 130
 131         if (band == IEEE80211_BAND_2GHZ && !no_cck)
 132                 return cpu_to_le32(IWL_RATE_1M_PLCP | RATE_MCS_CCK_MSK |
 133                                    tx_ant);
 134         else
 135                 return cpu_to_le32(IWL_RATE_6M_PLCP | tx_ant);
 136 }
 137
 138 /*
 139  * We insert the SSIDs in an inverted order, because the FW will
 140  * invert it back. The most prioritized SSID, which is first in the
 141  * request list, is not copied here, but inserted directly to the probe
 142  * request.
 143  */
 144 static void iwl_mvm_scan_fill_ssids(struct iwl_scan_cmd *cmd,
 145                                     struct cfg80211_scan_request *req,
 146                                     int first)
 147 {
 148         int fw_idx, req_idx;
 149
 150         for (req_idx = req->n_ssids - 1, fw_idx = 0; req_idx >= first;
 151              req_idx--, fw_idx++) {
 152                 cmd->direct_scan[fw_idx].id = WLAN_EID_SSID;
 153                 cmd->direct_scan[fw_idx].len = req->ssids[req_idx].ssid_len;
 154                 memcpy(cmd->direct_scan[fw_idx].ssid,
 155                        req->ssids[req_idx].ssid,
 156                        req->ssids[req_idx].ssid_len);
 157         }
 158 }
 159
 160 /*
 161  * If req->n_ssids > 0, it means we should do an active scan.
 162  * In case of active scan w/o directed scan, we receive a zero-length SSID
 163  * just to notify that this scan is active and not passive.
 164  * In order to notify the FW of the number of SSIDs we wish to scan (including
 165  * the zero-length one), we need to set the corresponding bits in chan->type,
 166  * one for each SSID, and set the active bit (first). If the first SSID is
 167  * already included in the probe template, so we need to set only
 168  * req->n_ssids - 1 bits in addition to the first bit.
 169  */
 170 static u16 iwl_mvm_get_active_dwell(enum ieee80211_band band, int n_ssids)
 171 {
 172         if (band == IEEE80211_BAND_2GHZ)
 173                 return 30  + 3 * (n_ssids + 1);
 174         return 20  + 2 * (n_ssids + 1);
 175 }
 176
 177 static u16 iwl_mvm_get_passive_dwell(enum ieee80211_band band)
 178 {
 179         return band == IEEE80211_BAND_2GHZ ? 100 + 20 : 100 + 10;
 180 }
 181
 182 static void iwl_mvm_scan_fill_channels(struct iwl_scan_cmd *cmd,
 183                                        struct cfg80211_scan_request *req,
 184                                        bool basic_ssid)
 185 {
 186         u16 passive_dwell = iwl_mvm_get_passive_dwell(req->channels[0]->band);
 187         u16 active_dwell = iwl_mvm_get_active_dwell(req->channels[0]->band,
 188                                                     req->n_ssids);
 189         struct iwl_scan_channel *chan = (struct iwl_scan_channel *)
 190                 (cmd->data + le16_to_cpu(cmd->tx_cmd.len));
 191         int i;
 192         int type = BIT(req->n_ssids) - 1;
 193
 194         if (!basic_ssid)
 195                 type |= BIT(req->n_ssids);
 196
 197         for (i = 0; i < cmd->channel_count; i++) {
 198                 chan->channel = cpu_to_le16(req->channels[i]->hw_value);
 199                 chan->type = cpu_to_le32(type);
 200                 if (req->channels[i]->flags & IEEE80211_CHAN_NO_IR)
 201                         chan->type &= cpu_to_le32(~SCAN_CHANNEL_TYPE_ACTIVE);
 202                 chan->active_dwell = cpu_to_le16(active_dwell);
 203                 chan->passive_dwell = cpu_to_le16(passive_dwell);
 204                 chan->iteration_count = cpu_to_le16(1);
 205                 chan++;
 206         }
 207 }
 208
 209 /*
 210  * Fill in probe request with the following parameters:
 211  * TA is our vif HW address, which mac80211 ensures we have.
 212  * Packet is broadcasted, so this is both SA and DA.
 213  * The probe request IE is made out of two: first comes the most prioritized
 214  * SSID if a directed scan is requested. Second comes whatever extra
 215  * information was given to us as the scan request IE.
 216  */
 217 static u16 iwl_mvm_fill_probe_req(struct ieee80211_mgmt *frame, const u8 *ta,
 218                                   int n_ssids, const u8 *ssid, int ssid_len,
 219                                   const u8 *ie, int ie_len,
 220                                   int left)
 221 {
 222         int len = 0;
 223         u8 *pos = NULL;
 224
 225         /* Make sure there is enough space for the probe request,
 226          * two mandatory IEs and the data */
 227         left -= 24;
 228         if (left < 0)
 229                 return 0;
 230
 231         frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
 232         eth_broadcast_addr(frame->da);
 233         memcpy(frame->sa, ta, ETH_ALEN);
 234         eth_broadcast_addr(frame->bssid);
 235         frame->seq_ctrl = 0;
 236
 237         len += 24;
 238
 239         /* for passive scans, no need to fill anything */
 240         if (n_ssids == 0)
 241                 return (u16)len;
 242
 243         /* points to the payload of the request */
 244         pos = &frame->u.probe_req.variable[0];
 245
 246         /* fill in our SSID IE */
 247         left -= ssid_len + 2;
 248         if (left < 0)
 249                 return 0;
 250         *pos++ = WLAN_EID_SSID;
 251         *pos++ = ssid_len;
 252         if (ssid && ssid_len) { /* ssid_len may be == 0 even if ssid is valid */
 253                 memcpy(pos, ssid, ssid_len);
 254                 pos += ssid_len;
 255         }
 256
 257         len += ssid_len + 2;
 258
 259         if (WARN_ON(left < ie_len))
 260                 return len;
 261
 262         if (ie && ie_len) {
 263                 memcpy(pos, ie, ie_len);
 264                 len += ie_len;
 265         }
 266
 267         return (u16)len;
 268 }
 269
 270 static void iwl_mvm_vif_assoc_iterator(void *data, u8 *mac,
 271                                        struct ieee80211_vif *vif)
 272 {
 273         bool *is_assoc = data;
 274
 275         if (vif->bss_conf.assoc)
 276                 *is_assoc = true;
 277 }
 278
 279 int iwl_mvm_scan_request(struct iwl_mvm *mvm,
 280                          struct ieee80211_vif *vif,
 281                          struct cfg80211_scan_request *req)
 282 {
 283         struct iwl_host_cmd hcmd = {
 284                 .id = SCAN_REQUEST_CMD,
 285                 .len = { 0, },
 286                 .data = { mvm->scan_cmd, },
 287                 .flags = CMD_SYNC,
 288                 .dataflags = { IWL_HCMD_DFL_NOCOPY, },
 289         };
 290         struct iwl_scan_cmd *cmd = mvm->scan_cmd;
 291         bool is_assoc = false;
 292         int ret;
 293         u32 status;
 294         int ssid_len = 0;
 295         u8 *ssid = NULL;
 296         bool basic_ssid = !(mvm->fw->ucode_capa.flags &
 297                            IWL_UCODE_TLV_FLAGS_NO_BASIC_SSID);
 298
 299         lockdep_assert_held(&mvm->mutex);
 300         BUG_ON(mvm->scan_cmd == NULL);
 301
 302         IWL_DEBUG_SCAN(mvm, "Handling mac80211 scan request\n");
 303         mvm->scan_status = IWL_MVM_SCAN_OS;
 304         memset(cmd, 0, sizeof(struct iwl_scan_cmd) +
 305                mvm->fw->ucode_capa.max_probe_length +
 306                (MAX_NUM_SCAN_CHANNELS * sizeof(struct iwl_scan_channel)));
 307         ieee80211_iterate_active_interfaces_atomic(mvm->hw,
 308                                             IEEE80211_IFACE_ITER_NORMAL,
 309                                             iwl_mvm_vif_assoc_iterator,
 310                                             &is_assoc);
 311         cmd->channel_count = (u8)req->n_channels;
 312         cmd->quiet_time = cpu_to_le16(IWL_ACTIVE_QUIET_TIME);
 313         cmd->quiet_plcp_th = cpu_to_le16(IWL_PLCP_QUIET_THRESH);
 314         cmd->rxchain_sel_flags = iwl_mvm_scan_rx_chain(mvm);
 315         cmd->max_out_time = iwl_mvm_scan_max_out_time(vif, req->flags,
 316                                                       is_assoc);
 317         cmd->suspend_time = iwl_mvm_scan_suspend_time(vif, is_assoc);
 318         cmd->rxon_flags = iwl_mvm_scan_rxon_flags(req);
 319         cmd->filter_flags = cpu_to_le32(MAC_FILTER_ACCEPT_GRP |
 320                                         MAC_FILTER_IN_BEACON);
 321
 322         if (vif->type == NL80211_IFTYPE_P2P_DEVICE)
 323                 cmd->type = cpu_to_le32(SCAN_TYPE_DISCOVERY_FORCED);
 324         else
 325                 cmd->type = cpu_to_le32(SCAN_TYPE_FORCED);
 326
 327         cmd->repeats = cpu_to_le32(1);
 328
 329         /*
 330          * If the user asked for passive scan, don't change to active scan if
 331          * you see any activity on the channel - remain passive.
 332          */
 333         if (req->n_ssids > 0) {
 334                 cmd->passive2active = cpu_to_le16(1);
 335                 cmd->scan_flags |= SCAN_FLAGS_PASSIVE2ACTIVE;
 336                 if (basic_ssid) {
 337                         ssid = req->ssids[0].ssid;
 338                         ssid_len = req->ssids[0].ssid_len;
 339                 }
 340         } else {
 341                 cmd->passive2active = 0;
 342                 cmd->scan_flags &= ~SCAN_FLAGS_PASSIVE2ACTIVE;
 343         }
 344
 345         iwl_mvm_scan_fill_ssids(cmd, req, basic_ssid ? 1 : 0);
 346
 347         cmd->tx_cmd.tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL |
 348                                            TX_CMD_FLG_BT_DIS);
 349         cmd->tx_cmd.sta_id = mvm->aux_sta.sta_id;
 350         cmd->tx_cmd.life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
 351         cmd->tx_cmd.rate_n_flags =
 352                         iwl_mvm_scan_rate_n_flags(mvm, req->channels[0]->band,
 353                                                   req->no_cck);
 354
 355         cmd->tx_cmd.len =
 356                 cpu_to_le16(iwl_mvm_fill_probe_req(
 357                             (struct ieee80211_mgmt *)cmd->data,
 358                             vif->addr,
 359                             req->n_ssids, ssid, ssid_len,
 360                             req->ie, req->ie_len,
 361                             mvm->fw->ucode_capa.max_probe_length));
 362
 363         iwl_mvm_scan_fill_channels(cmd, req, basic_ssid);
 364
 365         cmd->len = cpu_to_le16(sizeof(struct iwl_scan_cmd) +
 366                 le16_to_cpu(cmd->tx_cmd.len) +
 367                 (cmd->channel_count * sizeof(struct iwl_scan_channel)));
 368         hcmd.len[0] = le16_to_cpu(cmd->len);
 369
 370         status = SCAN_RESPONSE_OK;
 371         ret = iwl_mvm_send_cmd_status(mvm, &hcmd, &status);
 372         if (!ret && status == SCAN_RESPONSE_OK) {
 373                 IWL_DEBUG_SCAN(mvm, "Scan request was sent successfully\n");
 374         } else {
 375                 /*
 376                  * If the scan failed, it usually means that the FW was unable
 377                  * to allocate the time events. Warn on it, but maybe we
 378                  * should try to send the command again with different params.
 379                  */
 380                 IWL_ERR(mvm, "Scan failed! status 0x%x ret %d\n",
 381                         status, ret);
 382                 mvm->scan_status = IWL_MVM_SCAN_NONE;
 383                 ret = -EIO;
 384         }
 385         return ret;
 386 }
 387
 388 int iwl_mvm_rx_scan_response(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 389                           struct iwl_device_cmd *cmd)
 390 {
 391         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 392         struct iwl_cmd_response *resp = (void *)pkt->data;
 393
 394         IWL_DEBUG_SCAN(mvm, "Scan response received. status 0x%x\n",
 395                        le32_to_cpu(resp->status));
 396         return 0;
 397 }
 398
 399 int iwl_mvm_rx_scan_complete(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 400                           struct iwl_device_cmd *cmd)
 401 {
 402         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 403         struct iwl_scan_complete_notif *notif = (void *)pkt->data;
 404
 405         IWL_DEBUG_SCAN(mvm, "Scan complete: status=0x%x scanned channels=%d\n",
 406                        notif->status, notif->scanned_channels);
 407
 408         mvm->scan_status = IWL_MVM_SCAN_NONE;
 409         ieee80211_scan_completed(mvm->hw, notif->status != SCAN_COMP_STATUS_OK);
 410
 411         return 0;
 412 }
 413
 414 int iwl_mvm_rx_sched_scan_results(struct iwl_mvm *mvm,
 415                                   struct iwl_rx_cmd_buffer *rxb,
 416                                   struct iwl_device_cmd *cmd)
 417 {
 418         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 419         struct iwl_sched_scan_results *notif = (void *)pkt->data;
 420
 421         if (notif->client_bitmap & SCAN_CLIENT_SCHED_SCAN) {
 422                 IWL_DEBUG_SCAN(mvm, "Scheduled scan results\n");
 423                 ieee80211_sched_scan_results(mvm->hw);
 424         }
 425
 426         return 0;
 427 }
 428
 429 static bool iwl_mvm_scan_abort_notif(struct iwl_notif_wait_data *notif_wait,
 430                                      struct iwl_rx_packet *pkt, void *data)
 431 {
 432         struct iwl_mvm *mvm =
 433                 container_of(notif_wait, struct iwl_mvm, notif_wait);
 434         struct iwl_scan_complete_notif *notif;
 435         u32 *resp;
 436
 437         switch (pkt->hdr.cmd) {
 438         case SCAN_ABORT_CMD:
 439                 resp = (void *)pkt->data;
 440                 if (*resp == CAN_ABORT_STATUS) {
 441                         IWL_DEBUG_SCAN(mvm,
 442                                        "Scan can be aborted, wait until completion\n");
 443                         return false;
 444                 }
 445
 446                 /*
 447                  * If scan cannot be aborted, it means that we had a
 448                  * SCAN_COMPLETE_NOTIFICATION in the pipe and it called
 449                  * ieee80211_scan_completed already.
 450                  */
 451                 IWL_DEBUG_SCAN(mvm, "Scan cannot be aborted, exit now: %d\n",
 452                                *resp);
 453                 return true;
 454
 455         case SCAN_COMPLETE_NOTIFICATION:
 456                 notif = (void *)pkt->data;
 457                 IWL_DEBUG_SCAN(mvm, "Scan aborted: status 0x%x\n",
 458                                notif->status);
 459                 return true;
 460
 461         default:
 462                 WARN_ON(1);
 463                 return false;
 464         };
 465 }
 466
 467 void iwl_mvm_cancel_scan(struct iwl_mvm *mvm)
 468 {
 469         struct iwl_notification_wait wait_scan_abort;
 470         static const u8 scan_abort_notif[] = { SCAN_ABORT_CMD,
 471                                                SCAN_COMPLETE_NOTIFICATION };
 472         int ret;
 473
 474         if (mvm->scan_status == IWL_MVM_SCAN_NONE)
 475                 return;
 476
 477         if (iwl_mvm_is_radio_killed(mvm)) {
 478                 ieee80211_scan_completed(mvm->hw, true);
 479                 mvm->scan_status = IWL_MVM_SCAN_NONE;
 480                 return;
 481         }
 482
 483         iwl_init_notification_wait(&mvm->notif_wait, &wait_scan_abort,
 484                                    scan_abort_notif,
 485                                    ARRAY_SIZE(scan_abort_notif),
 486                                    iwl_mvm_scan_abort_notif, NULL);
 487
 488         ret = iwl_mvm_send_cmd_pdu(mvm, SCAN_ABORT_CMD, CMD_SYNC, 0, NULL);
 489         if (ret) {
 490                 IWL_ERR(mvm, "Couldn't send SCAN_ABORT_CMD: %d\n", ret);
 491                 /* mac80211's state will be cleaned in the fw_restart flow */
 492                 goto out_remove_notif;
 493         }
 494
 495         ret = iwl_wait_notification(&mvm->notif_wait, &wait_scan_abort, 1 * HZ);
 496         if (ret)
 497                 IWL_ERR(mvm, "%s - failed on timeout\n", __func__);
 498
 499         return;
 500
 501 out_remove_notif:
 502         iwl_remove_notification(&mvm->notif_wait, &wait_scan_abort);
 503 }
 504
 505 int iwl_mvm_rx_scan_offload_complete_notif(struct iwl_mvm *mvm,
 506                                            struct iwl_rx_cmd_buffer *rxb,
 507                                            struct iwl_device_cmd *cmd)
 508 {
 509         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 510         struct iwl_scan_offload_complete *scan_notif = (void *)pkt->data;
 511
 512         IWL_DEBUG_SCAN(mvm, "Scheduled scan completed, status %s\n",
 513                        scan_notif->status == IWL_SCAN_OFFLOAD_COMPLETED ?
 514                        "completed" : "aborted");
 515
 516         mvm->scan_status = IWL_MVM_SCAN_NONE;
 517         ieee80211_sched_scan_stopped(mvm->hw);
 518
 519         return 0;
 520 }
 521
 522 static void iwl_scan_offload_build_tx_cmd(struct iwl_mvm *mvm,
 523                                           struct ieee80211_vif *vif,
 524                                           struct ieee80211_sched_scan_ies *ies,
 525                                           enum ieee80211_band band,
 526                                           struct iwl_tx_cmd *cmd,
 527                                           u8 *data)
 528 {
 529         u16 cmd_len;
 530
 531         cmd->tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL);
 532         cmd->life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
 533         cmd->sta_id = mvm->aux_sta.sta_id;
 534
 535         cmd->rate_n_flags = iwl_mvm_scan_rate_n_flags(mvm, band, false);
 536
 537         cmd_len = iwl_mvm_fill_probe_req((struct ieee80211_mgmt *)data,
 538                                          vif->addr,
 539                                          1, NULL, 0,
 540                                          ies->ie[band], ies->len[band],
 541                                          SCAN_OFFLOAD_PROBE_REQ_SIZE);
 542         cmd->len = cpu_to_le16(cmd_len);
 543 }
 544
 545 static void iwl_build_scan_cmd(struct iwl_mvm *mvm,
 546                                struct ieee80211_vif *vif,
 547                                struct cfg80211_sched_scan_request *req,
 548                                struct iwl_scan_offload_cmd *scan)
 549 {
 550         bool is_assoc = false;
 551
 552         ieee80211_iterate_active_interfaces_atomic(mvm->hw,
 553                                             IEEE80211_IFACE_ITER_NORMAL,
 554                                             iwl_mvm_vif_assoc_iterator,
 555                                             &is_assoc);
 556         scan->channel_count =
 557                 mvm->nvm_data->bands[IEEE80211_BAND_2GHZ].n_channels +
 558                 mvm->nvm_data->bands[IEEE80211_BAND_5GHZ].n_channels;
 559         scan->quiet_time = cpu_to_le16(IWL_ACTIVE_QUIET_TIME);
 560         scan->quiet_plcp_th = cpu_to_le16(IWL_PLCP_QUIET_THRESH);
 561         scan->good_CRC_th = IWL_GOOD_CRC_TH_DEFAULT;
 562         scan->rx_chain = iwl_mvm_scan_rx_chain(mvm);
 563         scan->max_out_time = iwl_mvm_scan_max_out_time(vif, req->flags,
 564                                                        is_assoc);
 565         scan->suspend_time = iwl_mvm_scan_suspend_time(vif, is_assoc);
 566         scan->filter_flags |= cpu_to_le32(MAC_FILTER_ACCEPT_GRP |
 567                                           MAC_FILTER_IN_BEACON);
 568         scan->scan_type = cpu_to_le32(SCAN_TYPE_BACKGROUND);
 569         scan->rep_count = cpu_to_le32(1);
 570 }
 571
 572 static int iwl_ssid_exist(u8 *ssid, u8 ssid_len, struct iwl_ssid_ie *ssid_list)
 573 {
 574         int i;
 575
 576         for (i = 0; i < PROBE_OPTION_MAX; i++) {
 577                 if (!ssid_list[i].len)
 578                         break;
 579                 if (ssid_list[i].len == ssid_len &&
 580                     !memcmp(ssid_list->ssid, ssid, ssid_len))
 581                         return i;
 582         }
 583         return -1;
 584 }
 585
 586 static void iwl_scan_offload_build_ssid(struct cfg80211_sched_scan_request *req,
 587                                         struct iwl_scan_offload_cmd *scan,
 588                                         u32 *ssid_bitmap)
 589 {
 590         int i, j;
 591         int index;
 592
 593         /*
 594          * copy SSIDs from match list.
 595          * iwl_config_sched_scan_profiles() uses the order of these ssids to
 596          * config match list.
 597          */
 598         for (i = 0; i < req->n_match_sets && i < PROBE_OPTION_MAX; i++) {
 599                 scan->direct_scan[i].id = WLAN_EID_SSID;
 600                 scan->direct_scan[i].len = req->match_sets[i].ssid.ssid_len;
 601                 memcpy(scan->direct_scan[i].ssid, req->match_sets[i].ssid.ssid,
 602                        scan->direct_scan[i].len);
 603         }
 604
 605         /* add SSIDs from scan SSID list */
 606         *ssid_bitmap = 0;
 607         for (j = 0; j < req->n_ssids && i < PROBE_OPTION_MAX; j++) {
 608                 index = iwl_ssid_exist(req->ssids[j].ssid,
 609                                        req->ssids[j].ssid_len,
 610                                        scan->direct_scan);
 611                 if (index < 0) {
 612                         if (!req->ssids[j].ssid_len)
 613                                 continue;
 614                         scan->direct_scan[i].id = WLAN_EID_SSID;
 615                         scan->direct_scan[i].len = req->ssids[j].ssid_len;
 616                         memcpy(scan->direct_scan[i].ssid, req->ssids[j].ssid,
 617                                scan->direct_scan[i].len);
 618                         *ssid_bitmap |= BIT(i + 1);
 619                         i++;
 620                 } else {
 621                         *ssid_bitmap |= BIT(index + 1);
 622                 }
 623         }
 624 }
 625
 626 static void iwl_build_channel_cfg(struct iwl_mvm *mvm,
 627                                   struct cfg80211_sched_scan_request *req,
 628                                   struct iwl_scan_channel_cfg *channels,
 629                                   enum ieee80211_band band,
 630                                   int *head, int *tail,
 631                                   u32 ssid_bitmap)
 632 {
 633         struct ieee80211_supported_band *s_band;
 634         int n_probes = req->n_ssids;
 635         int n_channels = req->n_channels;
 636         u8 active_dwell, passive_dwell;
 637         int i, j, index = 0;
 638         bool partial;
 639
 640         /*
 641          * We have to configure all supported channels, even if we don't want to
 642          * scan on them, but we have to send channels in the order that we want
 643          * to scan. So add requested channels to head of the list and others to
 644          * the end.
 645         */
 646         active_dwell = iwl_mvm_get_active_dwell(band, n_probes);
 647         passive_dwell = iwl_mvm_get_passive_dwell(band);
 648         s_band = &mvm->nvm_data->bands[band];
 649
 650         for (i = 0; i < s_band->n_channels && *head <= *tail; i++) {
 651                 partial = false;
 652                 for (j = 0; j < n_channels; j++)
 653                         if (s_band->channels[i].center_freq ==
 654                                                 req->channels[j]->center_freq) {
 655                                 index = *head;
 656                                 (*head)++;
 657                                 /*
 658                                  * Channels that came with the request will be
 659                                  * in partial scan .
 660                                  */
 661                                 partial = true;
 662                                 break;
 663                         }
 664                 if (!partial) {
 665                         index = *tail;
 666                         (*tail)--;
 667                 }
 668                 channels->channel_number[index] =
 669                         cpu_to_le16(ieee80211_frequency_to_channel(
 670                                         s_band->channels[i].center_freq));
 671                 channels->dwell_time[index][0] = active_dwell;
 672                 channels->dwell_time[index][1] = passive_dwell;
 673
 674                 channels->iter_count[index] = cpu_to_le16(1);
 675                 channels->iter_interval[index] = 0;
 676
 677                 if (!(s_band->channels[i].flags & IEEE80211_CHAN_NO_IR))
 678                         channels->type[index] |=
 679                                 cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_ACTIVE);
 680
 681                 channels->type[index] |=
 682                                 cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_FULL);
 683                 if (partial)
 684                         channels->type[index] |=
 685                                 cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_PARTIAL);
 686
 687                 if (s_band->channels[i].flags & IEEE80211_CHAN_NO_HT40)
 688                         channels->type[index] |=
 689                                 cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_NARROW);
 690
 691                 /* scan for all SSIDs from req->ssids */
 692                 channels->type[index] |= cpu_to_le32(ssid_bitmap);
 693         }
 694 }
 695
 696 int iwl_mvm_config_sched_scan(struct iwl_mvm *mvm,
 697                               struct ieee80211_vif *vif,
 698                               struct cfg80211_sched_scan_request *req,
 699                               struct ieee80211_sched_scan_ies *ies)
 700 {
 701         int supported_bands = 0;
 702         int band_2ghz = mvm->nvm_data->bands[IEEE80211_BAND_2GHZ].n_channels;
 703         int band_5ghz = mvm->nvm_data->bands[IEEE80211_BAND_5GHZ].n_channels;
 704         int head = 0;
 705         int tail = band_2ghz + band_5ghz;
 706         u32 ssid_bitmap;
 707         int cmd_len;
 708         int ret;
 709
 710         struct iwl_scan_offload_cfg *scan_cfg;
 711         struct iwl_host_cmd cmd = {
 712                 .id = SCAN_OFFLOAD_CONFIG_CMD,
 713                 .flags = CMD_SYNC,
 714         };
 715
 716         lockdep_assert_held(&mvm->mutex);
 717
 718         if (band_2ghz)
 719                 supported_bands++;
 720         if (band_5ghz)
 721                 supported_bands++;
 722
 723         cmd_len = sizeof(struct iwl_scan_offload_cfg) +
 724                                 supported_bands * SCAN_OFFLOAD_PROBE_REQ_SIZE;
 725
 726         scan_cfg = kzalloc(cmd_len, GFP_KERNEL);
 727         if (!scan_cfg)
 728                 return -ENOMEM;
 729
 730         iwl_build_scan_cmd(mvm, vif, req, &scan_cfg->scan_cmd);
 731         scan_cfg->scan_cmd.len = cpu_to_le16(cmd_len);
 732
 733         iwl_scan_offload_build_ssid(req, &scan_cfg->scan_cmd, &ssid_bitmap);
 734         /* build tx frames for supported bands */
 735         if (band_2ghz) {
 736                 iwl_scan_offload_build_tx_cmd(mvm, vif, ies,
 737                                               IEEE80211_BAND_2GHZ,
 738                                               &scan_cfg->scan_cmd.tx_cmd[0],
 739                                               scan_cfg->data);
 740                 iwl_build_channel_cfg(mvm, req, &scan_cfg->channel_cfg,
 741                                       IEEE80211_BAND_2GHZ, &head, &tail,
 742                                       ssid_bitmap);
 743         }
 744         if (band_5ghz) {
 745                 iwl_scan_offload_build_tx_cmd(mvm, vif, ies,
 746                                               IEEE80211_BAND_5GHZ,
 747                                               &scan_cfg->scan_cmd.tx_cmd[1],
 748                                               scan_cfg->data +
 749                                                 SCAN_OFFLOAD_PROBE_REQ_SIZE);
 750                 iwl_build_channel_cfg(mvm, req, &scan_cfg->channel_cfg,
 751                                       IEEE80211_BAND_5GHZ, &head, &tail,
 752                                       ssid_bitmap);
 753         }
 754
 755         cmd.data[0] = scan_cfg;
 756         cmd.len[0] = cmd_len;
 757         cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
 758
 759         IWL_DEBUG_SCAN(mvm, "Sending scheduled scan config\n");
 760
 761         ret = iwl_mvm_send_cmd(mvm, &cmd);
 762         kfree(scan_cfg);
 763         return ret;
 764 }
 765
 766 int iwl_mvm_config_sched_scan_profiles(struct iwl_mvm *mvm,
 767                                        struct cfg80211_sched_scan_request *req)
 768 {
 769         struct iwl_scan_offload_profile *profile;
 770         struct iwl_scan_offload_profile_cfg *profile_cfg;
 771         struct iwl_scan_offload_blacklist *blacklist;
 772         struct iwl_host_cmd cmd = {
 773                 .id = SCAN_OFFLOAD_UPDATE_PROFILES_CMD,
 774                 .flags = CMD_SYNC,
 775                 .len[1] = sizeof(*profile_cfg),
 776                 .dataflags[0] = IWL_HCMD_DFL_NOCOPY,
 777                 .dataflags[1] = IWL_HCMD_DFL_NOCOPY,
 778         };
 779         int blacklist_len;
 780         int i;
 781         int ret;
 782
 783         if (WARN_ON(req->n_match_sets > IWL_SCAN_MAX_PROFILES))
 784                         return -EIO;
 785
 786         if (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_SHORT_BL)
 787                 blacklist_len = IWL_SCAN_SHORT_BLACKLIST_LEN;
 788         else
 789                 blacklist_len = IWL_SCAN_MAX_BLACKLIST_LEN;
 790
 791         blacklist = kzalloc(sizeof(*blacklist) * blacklist_len, GFP_KERNEL);
 792         if (!blacklist)
 793                 return -ENOMEM;
 794
 795         profile_cfg = kzalloc(sizeof(*profile_cfg), GFP_KERNEL);
 796         if (!profile_cfg) {
 797                 ret = -ENOMEM;
 798                 goto free_blacklist;
 799         }
 800
 801         cmd.data[0] = blacklist;
 802         cmd.len[0] = sizeof(*blacklist) * blacklist_len;
 803         cmd.data[1] = profile_cfg;
 804
 805         /* No blacklist configuration */
 806
 807         profile_cfg->num_profiles = req->n_match_sets;
 808         profile_cfg->active_clients = SCAN_CLIENT_SCHED_SCAN;
 809         profile_cfg->pass_match = SCAN_CLIENT_SCHED_SCAN;
 810         profile_cfg->match_notify = SCAN_CLIENT_SCHED_SCAN;
 811         if (!req->n_match_sets || !req->match_sets[0].ssid.ssid_len)
 812                 profile_cfg->any_beacon_notify = SCAN_CLIENT_SCHED_SCAN;
 813
 814         for (i = 0; i < req->n_match_sets; i++) {
 815                 profile = &profile_cfg->profiles[i];
 816                 profile->ssid_index = i;
 817                 /* Support any cipher and auth algorithm */
 818                 profile->unicast_cipher = 0xff;
 819                 profile->auth_alg = 0xff;
 820                 profile->network_type = IWL_NETWORK_TYPE_ANY;
 821                 profile->band_selection = IWL_SCAN_OFFLOAD_SELECT_ANY;
 822                 profile->client_bitmap = SCAN_CLIENT_SCHED_SCAN;
 823         }
 824
 825         IWL_DEBUG_SCAN(mvm, "Sending scheduled scan profile config\n");
 826
 827         ret = iwl_mvm_send_cmd(mvm, &cmd);
 828         kfree(profile_cfg);
 829 free_blacklist:
 830         kfree(blacklist);
 831
 832         return ret;
 833 }
 834
 835 int iwl_mvm_sched_scan_start(struct iwl_mvm *mvm,
 836                              struct cfg80211_sched_scan_request *req)
 837 {
 838         struct iwl_scan_offload_req scan_req = {
 839                 .watchdog = IWL_SCHED_SCAN_WATCHDOG,
 840
 841                 .schedule_line[0].iterations = IWL_FAST_SCHED_SCAN_ITERATIONS,
 842                 .schedule_line[0].delay = req->interval / 1000,
 843                 .schedule_line[0].full_scan_mul = 1,
 844
 845                 .schedule_line[1].iterations = 0xff,
 846                 .schedule_line[1].delay = req->interval / 1000,
 847                 .schedule_line[1].full_scan_mul = IWL_FULL_SCAN_MULTIPLIER,
 848         };
 849
 850         if (req->n_match_sets && req->match_sets[0].ssid.ssid_len) {
 851                 IWL_DEBUG_SCAN(mvm,
 852                                "Sending scheduled scan with filtering, filter len %d\n",
 853                                req->n_match_sets);
 854         } else {
 855                 IWL_DEBUG_SCAN(mvm,
 856                                "Sending Scheduled scan without filtering\n");
 857                 scan_req.flags |= cpu_to_le16(IWL_SCAN_OFFLOAD_FLAG_PASS_ALL);
 858         }
 859
 860         return iwl_mvm_send_cmd_pdu(mvm, SCAN_OFFLOAD_REQUEST_CMD, CMD_SYNC,
 861                                     sizeof(scan_req), &scan_req);
 862 }
 863
 864 static int iwl_mvm_send_sched_scan_abort(struct iwl_mvm *mvm)
 865 {
 866         int ret;
 867         struct iwl_host_cmd cmd = {
 868                 .id = SCAN_OFFLOAD_ABORT_CMD,
 869                 .flags = CMD_SYNC,
 870         };
 871         u32 status;
 872
 873         /* Exit instantly with error when device is not ready
 874          * to receive scan abort command or it does not perform
 875          * scheduled scan currently */
 876         if (mvm->scan_status != IWL_MVM_SCAN_SCHED)
 877                 return -EIO;
 878
 879         ret = iwl_mvm_send_cmd_status(mvm, &cmd, &status);
 880         if (ret)
 881                 return ret;
 882
 883         if (status != CAN_ABORT_STATUS) {
 884                 /*
 885                  * The scan abort will return 1 for success or
 886                  * 2 for "failure".  A failure condition can be
 887                  * due to simply not being in an active scan which
 888                  * can occur if we send the scan abort before the
 889                  * microcode has notified us that a scan is completed.
 890                  */
 891                 IWL_DEBUG_SCAN(mvm, "SCAN OFFLOAD ABORT ret %d.\n", status);
 892                 ret = -EIO;
 893         }
 894
 895         return ret;
 896 }
 897
 898 void iwl_mvm_sched_scan_stop(struct iwl_mvm *mvm)
 899 {
 900         int ret;
 901
 902         lockdep_assert_held(&mvm->mutex);
 903
 904         if (mvm->scan_status != IWL_MVM_SCAN_SCHED) {
 905                 IWL_DEBUG_SCAN(mvm, "No offloaded scan to stop\n");
 906                 return;
 907         }
 908
 909         ret = iwl_mvm_send_sched_scan_abort(mvm);
 910         if (ret)
 911                 IWL_DEBUG_SCAN(mvm, "Send stop offload scan failed %d\n", ret);
 912         else
 913                 IWL_DEBUG_SCAN(mvm, "Successfully sent stop offload scan\n");
 914 }