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

   1 /******************************************************************************
   2  *
   3  * This file is provided under a dual BSD/GPLv2 license.  When using or
   4  * redistributing this file, you may do so under either license.
   5  *
   6  * GPL LICENSE SUMMARY
   7  *
   8  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of version 2 of the GNU General Public License as
  12  * published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  22  * USA
  23  *
  24  * The full GNU General Public License is included in this distribution
  25  * in the file called COPYING.
  26  *
  27  * Contact Information:
  28  *  Intel Linux Wireless <ilw@linux.intel.com>
  29  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  30  *
  31  * BSD LICENSE
  32  *
  33  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  34  * All rights reserved.
  35  *
  36  * Redistribution and use in source and binary forms, with or without
  37  * modification, are permitted provided that the following conditions
  38  * are met:
  39  *
  40  *  * Redistributions of source code must retain the above copyright
  41  *    notice, this list of conditions and the following disclaimer.
  42  *  * Redistributions in binary form must reproduce the above copyright
  43  *    notice, this list of conditions and the following disclaimer in
  44  *    the documentation and/or other materials provided with the
  45  *    distribution.
  46  *  * Neither the name Intel Corporation nor the names of its
  47  *    contributors may be used to endorse or promote products derived
  48  *    from this software without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  51  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  52  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  53  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  54  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  55  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  56  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  57  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  58  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  59  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  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         cmd->tx_cmd.sta_id = mvm->aux_sta.sta_id;
 349         cmd->tx_cmd.life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
 350         cmd->tx_cmd.rate_n_flags =
 351                         iwl_mvm_scan_rate_n_flags(mvm, req->channels[0]->band,
 352                                                   req->no_cck);
 353
 354         cmd->tx_cmd.len =
 355                 cpu_to_le16(iwl_mvm_fill_probe_req(
 356                             (struct ieee80211_mgmt *)cmd->data,
 357                             vif->addr,
 358                             req->n_ssids, ssid, ssid_len,
 359                             req->ie, req->ie_len,
 360                             mvm->fw->ucode_capa.max_probe_length));
 361
 362         iwl_mvm_scan_fill_channels(cmd, req, basic_ssid);
 363
 364         cmd->len = cpu_to_le16(sizeof(struct iwl_scan_cmd) +
 365                 le16_to_cpu(cmd->tx_cmd.len) +
 366                 (cmd->channel_count * sizeof(struct iwl_scan_channel)));
 367         hcmd.len[0] = le16_to_cpu(cmd->len);
 368
 369         status = SCAN_RESPONSE_OK;
 370         ret = iwl_mvm_send_cmd_status(mvm, &hcmd, &status);
 371         if (!ret && status == SCAN_RESPONSE_OK) {
 372                 IWL_DEBUG_SCAN(mvm, "Scan request was sent successfully\n");
 373         } else {
 374                 /*
 375                  * If the scan failed, it usually means that the FW was unable
 376                  * to allocate the time events. Warn on it, but maybe we
 377                  * should try to send the command again with different params.
 378                  */
 379                 IWL_ERR(mvm, "Scan failed! status 0x%x ret %d\n",
 380                         status, ret);
 381                 mvm->scan_status = IWL_MVM_SCAN_NONE;
 382                 ret = -EIO;
 383         }
 384         return ret;
 385 }
 386
 387 int iwl_mvm_rx_scan_response(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 388                           struct iwl_device_cmd *cmd)
 389 {
 390         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 391         struct iwl_cmd_response *resp = (void *)pkt->data;
 392
 393         IWL_DEBUG_SCAN(mvm, "Scan response received. status 0x%x\n",
 394                        le32_to_cpu(resp->status));
 395         return 0;
 396 }
 397
 398 int iwl_mvm_rx_scan_complete(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 399                           struct iwl_device_cmd *cmd)
 400 {
 401         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 402         struct iwl_scan_complete_notif *notif = (void *)pkt->data;
 403
 404         IWL_DEBUG_SCAN(mvm, "Scan complete: status=0x%x scanned channels=%d\n",
 405                        notif->status, notif->scanned_channels);
 406
 407         mvm->scan_status = IWL_MVM_SCAN_NONE;
 408         ieee80211_scan_completed(mvm->hw, notif->status != SCAN_COMP_STATUS_OK);
 409
 410         return 0;
 411 }
 412
 413 int iwl_mvm_rx_sched_scan_results(struct iwl_mvm *mvm,
 414                                   struct iwl_rx_cmd_buffer *rxb,
 415                                   struct iwl_device_cmd *cmd)
 416 {
 417         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 418         struct iwl_sched_scan_results *notif = (void *)pkt->data;
 419
 420         if (notif->client_bitmap & SCAN_CLIENT_SCHED_SCAN) {
 421                 IWL_DEBUG_SCAN(mvm, "Scheduled scan results\n");
 422                 ieee80211_sched_scan_results(mvm->hw);
 423         }
 424
 425         return 0;
 426 }
 427
 428 static bool iwl_mvm_scan_abort_notif(struct iwl_notif_wait_data *notif_wait,
 429                                      struct iwl_rx_packet *pkt, void *data)
 430 {
 431         struct iwl_mvm *mvm =
 432                 container_of(notif_wait, struct iwl_mvm, notif_wait);
 433         struct iwl_scan_complete_notif *notif;
 434         u32 *resp;
 435
 436         switch (pkt->hdr.cmd) {
 437         case SCAN_ABORT_CMD:
 438                 resp = (void *)pkt->data;
 439                 if (*resp == CAN_ABORT_STATUS) {
 440                         IWL_DEBUG_SCAN(mvm,
 441                                        "Scan can be aborted, wait until completion\n");
 442                         return false;
 443                 }
 444
 445                 /*
 446                  * If scan cannot be aborted, it means that we had a
 447                  * SCAN_COMPLETE_NOTIFICATION in the pipe and it called
 448                  * ieee80211_scan_completed already.
 449                  */
 450                 IWL_DEBUG_SCAN(mvm, "Scan cannot be aborted, exit now: %d\n",
 451                                *resp);
 452                 return true;
 453
 454         case SCAN_COMPLETE_NOTIFICATION:
 455                 notif = (void *)pkt->data;
 456                 IWL_DEBUG_SCAN(mvm, "Scan aborted: status 0x%x\n",
 457                                notif->status);
 458                 return true;
 459
 460         default:
 461                 WARN_ON(1);
 462                 return false;
 463         };
 464 }
 465
 466 void iwl_mvm_cancel_scan(struct iwl_mvm *mvm)
 467 {
 468         struct iwl_notification_wait wait_scan_abort;
 469         static const u8 scan_abort_notif[] = { SCAN_ABORT_CMD,
 470                                                SCAN_COMPLETE_NOTIFICATION };
 471         int ret;
 472
 473         if (mvm->scan_status == IWL_MVM_SCAN_NONE)
 474                 return;
 475
 476         if (iwl_mvm_is_radio_killed(mvm)) {
 477                 ieee80211_scan_completed(mvm->hw, true);
 478                 mvm->scan_status = IWL_MVM_SCAN_NONE;
 479                 return;
 480         }
 481
 482         iwl_init_notification_wait(&mvm->notif_wait, &wait_scan_abort,
 483                                    scan_abort_notif,
 484                                    ARRAY_SIZE(scan_abort_notif),
 485                                    iwl_mvm_scan_abort_notif, NULL);
 486
 487         ret = iwl_mvm_send_cmd_pdu(mvm, SCAN_ABORT_CMD, CMD_SYNC, 0, NULL);
 488         if (ret) {
 489                 IWL_ERR(mvm, "Couldn't send SCAN_ABORT_CMD: %d\n", ret);
 490                 /* mac80211's state will be cleaned in the fw_restart flow */
 491                 goto out_remove_notif;
 492         }
 493
 494         ret = iwl_wait_notification(&mvm->notif_wait, &wait_scan_abort, 1 * HZ);
 495         if (ret)
 496                 IWL_ERR(mvm, "%s - failed on timeout\n", __func__);
 497
 498         return;
 499
 500 out_remove_notif:
 501         iwl_remove_notification(&mvm->notif_wait, &wait_scan_abort);
 502 }
 503
 504 int iwl_mvm_rx_scan_offload_complete_notif(struct iwl_mvm *mvm,
 505                                            struct iwl_rx_cmd_buffer *rxb,
 506                                            struct iwl_device_cmd *cmd)
 507 {
 508         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 509         struct iwl_scan_offload_complete *scan_notif = (void *)pkt->data;
 510
 511         IWL_DEBUG_SCAN(mvm, "Scheduled scan completed, status %s\n",
 512                        scan_notif->status == IWL_SCAN_OFFLOAD_COMPLETED ?
 513                        "completed" : "aborted");
 514
 515         mvm->scan_status = IWL_MVM_SCAN_NONE;
 516         ieee80211_sched_scan_stopped(mvm->hw);
 517
 518         return 0;
 519 }
 520
 521 static void iwl_scan_offload_build_tx_cmd(struct iwl_mvm *mvm,
 522                                           struct ieee80211_vif *vif,
 523                                           struct ieee80211_sched_scan_ies *ies,
 524                                           enum ieee80211_band band,
 525                                           struct iwl_tx_cmd *cmd,
 526                                           u8 *data)
 527 {
 528         u16 cmd_len;
 529
 530         cmd->tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL);
 531         cmd->life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
 532         cmd->sta_id = mvm->aux_sta.sta_id;
 533
 534         cmd->rate_n_flags = iwl_mvm_scan_rate_n_flags(mvm, band, false);
 535
 536         cmd_len = iwl_mvm_fill_probe_req((struct ieee80211_mgmt *)data,
 537                                          vif->addr,
 538                                          1, NULL, 0,
 539                                          ies->ie[band], ies->len[band],
 540                                          SCAN_OFFLOAD_PROBE_REQ_SIZE);
 541         cmd->len = cpu_to_le16(cmd_len);
 542 }
 543
 544 static void iwl_build_scan_cmd(struct iwl_mvm *mvm,
 545                                struct ieee80211_vif *vif,
 546                                struct cfg80211_sched_scan_request *req,
 547                                struct iwl_scan_offload_cmd *scan)
 548 {
 549         bool is_assoc = false;
 550
 551         ieee80211_iterate_active_interfaces_atomic(mvm->hw,
 552                                             IEEE80211_IFACE_ITER_NORMAL,
 553                                             iwl_mvm_vif_assoc_iterator,
 554                                             &is_assoc);
 555         scan->channel_count =
 556                 mvm->nvm_data->bands[IEEE80211_BAND_2GHZ].n_channels +
 557                 mvm->nvm_data->bands[IEEE80211_BAND_5GHZ].n_channels;
 558         scan->quiet_time = cpu_to_le16(IWL_ACTIVE_QUIET_TIME);
 559         scan->quiet_plcp_th = cpu_to_le16(IWL_PLCP_QUIET_THRESH);
 560         scan->good_CRC_th = IWL_GOOD_CRC_TH_DEFAULT;
 561         scan->rx_chain = iwl_mvm_scan_rx_chain(mvm);
 562         scan->max_out_time = iwl_mvm_scan_max_out_time(vif, req->flags,
 563                                                        is_assoc);
 564         scan->suspend_time = iwl_mvm_scan_suspend_time(vif, is_assoc);
 565         scan->filter_flags |= cpu_to_le32(MAC_FILTER_ACCEPT_GRP |
 566                                           MAC_FILTER_IN_BEACON);
 567         scan->scan_type = cpu_to_le32(SCAN_TYPE_BACKGROUND);
 568         scan->rep_count = cpu_to_le32(1);
 569 }
 570
 571 static int iwl_ssid_exist(u8 *ssid, u8 ssid_len, struct iwl_ssid_ie *ssid_list)
 572 {
 573         int i;
 574
 575         for (i = 0; i < PROBE_OPTION_MAX; i++) {
 576                 if (!ssid_list[i].len)
 577                         break;
 578                 if (ssid_list[i].len == ssid_len &&
 579                     !memcmp(ssid_list->ssid, ssid, ssid_len))
 580                         return i;
 581         }
 582         return -1;
 583 }
 584
 585 static void iwl_scan_offload_build_ssid(struct cfg80211_sched_scan_request *req,
 586                                         struct iwl_scan_offload_cmd *scan,
 587                                         u32 *ssid_bitmap)
 588 {
 589         int i, j;
 590         int index;
 591
 592         /*
 593          * copy SSIDs from match list.
 594          * iwl_config_sched_scan_profiles() uses the order of these ssids to
 595          * config match list.
 596          */
 597         for (i = 0; i < req->n_match_sets && i < PROBE_OPTION_MAX; i++) {
 598                 scan->direct_scan[i].id = WLAN_EID_SSID;
 599                 scan->direct_scan[i].len = req->match_sets[i].ssid.ssid_len;
 600                 memcpy(scan->direct_scan[i].ssid, req->match_sets[i].ssid.ssid,
 601                        scan->direct_scan[i].len);
 602         }
 603
 604         /* add SSIDs from scan SSID list */
 605         *ssid_bitmap = 0;
 606         for (j = 0; j < req->n_ssids && i < PROBE_OPTION_MAX; j++) {
 607                 index = iwl_ssid_exist(req->ssids[j].ssid,
 608                                        req->ssids[j].ssid_len,
 609                                        scan->direct_scan);
 610                 if (index < 0) {
 611                         if (!req->ssids[j].ssid_len)
 612                                 continue;
 613                         scan->direct_scan[i].id = WLAN_EID_SSID;
 614                         scan->direct_scan[i].len = req->ssids[j].ssid_len;
 615                         memcpy(scan->direct_scan[i].ssid, req->ssids[j].ssid,
 616                                scan->direct_scan[i].len);
 617                         *ssid_bitmap |= BIT(i + 1);
 618                         i++;
 619                 } else {
 620                         *ssid_bitmap |= BIT(index + 1);
 621                 }
 622         }
 623 }
 624
 625 static void iwl_build_channel_cfg(struct iwl_mvm *mvm,
 626                                   struct cfg80211_sched_scan_request *req,
 627                                   struct iwl_scan_channel_cfg *channels,
 628                                   enum ieee80211_band band,
 629                                   int *head, int *tail,
 630                                   u32 ssid_bitmap)
 631 {
 632         struct ieee80211_supported_band *s_band;
 633         int n_probes = req->n_ssids;
 634         int n_channels = req->n_channels;
 635         u8 active_dwell, passive_dwell;
 636         int i, j, index = 0;
 637         bool partial;
 638
 639         /*
 640          * We have to configure all supported channels, even if we don't want to
 641          * scan on them, but we have to send channels in the order that we want
 642          * to scan. So add requested channels to head of the list and others to
 643          * the end.
 644         */
 645         active_dwell = iwl_mvm_get_active_dwell(band, n_probes);
 646         passive_dwell = iwl_mvm_get_passive_dwell(band);
 647         s_band = &mvm->nvm_data->bands[band];
 648
 649         for (i = 0; i < s_band->n_channels && *head <= *tail; i++) {
 650                 partial = false;
 651                 for (j = 0; j < n_channels; j++)
 652                         if (s_band->channels[i].center_freq ==
 653                                                 req->channels[j]->center_freq) {
 654                                 index = *head;
 655                                 (*head)++;
 656                                 /*
 657                                  * Channels that came with the request will be
 658                                  * in partial scan .
 659                                  */
 660                                 partial = true;
 661                                 break;
 662                         }
 663                 if (!partial) {
 664                         index = *tail;
 665                         (*tail)--;
 666                 }
 667                 channels->channel_number[index] =
 668                         cpu_to_le16(ieee80211_frequency_to_channel(
 669                                         s_band->channels[i].center_freq));
 670                 channels->dwell_time[index][0] = active_dwell;
 671                 channels->dwell_time[index][1] = passive_dwell;
 672
 673                 channels->iter_count[index] = cpu_to_le16(1);
 674                 channels->iter_interval[index] = 0;
 675
 676                 if (!(s_band->channels[i].flags & IEEE80211_CHAN_NO_IR))
 677                         channels->type[index] |=
 678                                 cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_ACTIVE);
 679
 680                 channels->type[index] |=
 681                                 cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_FULL);
 682                 if (partial)
 683                         channels->type[index] |=
 684                                 cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_PARTIAL);
 685
 686                 if (s_band->channels[i].flags & IEEE80211_CHAN_NO_HT40)
 687                         channels->type[index] |=
 688                                 cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_NARROW);
 689
 690                 /* scan for all SSIDs from req->ssids */
 691                 channels->type[index] |= cpu_to_le32(ssid_bitmap);
 692         }
 693 }
 694
 695 int iwl_mvm_config_sched_scan(struct iwl_mvm *mvm,
 696                               struct ieee80211_vif *vif,
 697                               struct cfg80211_sched_scan_request *req,
 698                               struct ieee80211_sched_scan_ies *ies)
 699 {
 700         int supported_bands = 0;
 701         int band_2ghz = mvm->nvm_data->bands[IEEE80211_BAND_2GHZ].n_channels;
 702         int band_5ghz = mvm->nvm_data->bands[IEEE80211_BAND_5GHZ].n_channels;
 703         int head = 0;
 704         int tail = band_2ghz + band_5ghz;
 705         u32 ssid_bitmap;
 706         int cmd_len;
 707         int ret;
 708
 709         struct iwl_scan_offload_cfg *scan_cfg;
 710         struct iwl_host_cmd cmd = {
 711                 .id = SCAN_OFFLOAD_CONFIG_CMD,
 712                 .flags = CMD_SYNC,
 713         };
 714
 715         lockdep_assert_held(&mvm->mutex);
 716
 717         if (band_2ghz)
 718                 supported_bands++;
 719         if (band_5ghz)
 720                 supported_bands++;
 721
 722         cmd_len = sizeof(struct iwl_scan_offload_cfg) +
 723                                 supported_bands * SCAN_OFFLOAD_PROBE_REQ_SIZE;
 724
 725         scan_cfg = kzalloc(cmd_len, GFP_KERNEL);
 726         if (!scan_cfg)
 727                 return -ENOMEM;
 728
 729         iwl_build_scan_cmd(mvm, vif, req, &scan_cfg->scan_cmd);
 730         scan_cfg->scan_cmd.len = cpu_to_le16(cmd_len);
 731
 732         iwl_scan_offload_build_ssid(req, &scan_cfg->scan_cmd, &ssid_bitmap);
 733         /* build tx frames for supported bands */
 734         if (band_2ghz) {
 735                 iwl_scan_offload_build_tx_cmd(mvm, vif, ies,
 736                                               IEEE80211_BAND_2GHZ,
 737                                               &scan_cfg->scan_cmd.tx_cmd[0],
 738                                               scan_cfg->data);
 739                 iwl_build_channel_cfg(mvm, req, &scan_cfg->channel_cfg,
 740                                       IEEE80211_BAND_2GHZ, &head, &tail,
 741                                       ssid_bitmap);
 742         }
 743         if (band_5ghz) {
 744                 iwl_scan_offload_build_tx_cmd(mvm, vif, ies,
 745                                               IEEE80211_BAND_5GHZ,
 746                                               &scan_cfg->scan_cmd.tx_cmd[1],
 747                                               scan_cfg->data +
 748                                                 SCAN_OFFLOAD_PROBE_REQ_SIZE);
 749                 iwl_build_channel_cfg(mvm, req, &scan_cfg->channel_cfg,
 750                                       IEEE80211_BAND_5GHZ, &head, &tail,
 751                                       ssid_bitmap);
 752         }
 753
 754         cmd.data[0] = scan_cfg;
 755         cmd.len[0] = cmd_len;
 756         cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
 757
 758         IWL_DEBUG_SCAN(mvm, "Sending scheduled scan config\n");
 759
 760         ret = iwl_mvm_send_cmd(mvm, &cmd);
 761         kfree(scan_cfg);
 762         return ret;
 763 }
 764
 765 int iwl_mvm_config_sched_scan_profiles(struct iwl_mvm *mvm,
 766                                        struct cfg80211_sched_scan_request *req)
 767 {
 768         struct iwl_scan_offload_profile *profile;
 769         struct iwl_scan_offload_profile_cfg *profile_cfg;
 770         struct iwl_scan_offload_blacklist *blacklist;
 771         struct iwl_host_cmd cmd = {
 772                 .id = SCAN_OFFLOAD_UPDATE_PROFILES_CMD,
 773                 .flags = CMD_SYNC,
 774                 .len[1] = sizeof(*profile_cfg),
 775                 .dataflags[0] = IWL_HCMD_DFL_NOCOPY,
 776                 .dataflags[1] = IWL_HCMD_DFL_NOCOPY,
 777         };
 778         int blacklist_len;
 779         int i;
 780         int ret;
 781
 782         if (WARN_ON(req->n_match_sets > IWL_SCAN_MAX_PROFILES))
 783                         return -EIO;
 784
 785         if (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_SHORT_BL)
 786                 blacklist_len = IWL_SCAN_SHORT_BLACKLIST_LEN;
 787         else
 788                 blacklist_len = IWL_SCAN_MAX_BLACKLIST_LEN;
 789
 790         blacklist = kzalloc(sizeof(*blacklist) * blacklist_len, GFP_KERNEL);
 791         if (!blacklist)
 792                 return -ENOMEM;
 793
 794         profile_cfg = kzalloc(sizeof(*profile_cfg), GFP_KERNEL);
 795         if (!profile_cfg) {
 796                 ret = -ENOMEM;
 797                 goto free_blacklist;
 798         }
 799
 800         cmd.data[0] = blacklist;
 801         cmd.len[0] = sizeof(*blacklist) * blacklist_len;
 802         cmd.data[1] = profile_cfg;
 803
 804         /* No blacklist configuration */
 805
 806         profile_cfg->num_profiles = req->n_match_sets;
 807         profile_cfg->active_clients = SCAN_CLIENT_SCHED_SCAN;
 808         profile_cfg->pass_match = SCAN_CLIENT_SCHED_SCAN;
 809         profile_cfg->match_notify = SCAN_CLIENT_SCHED_SCAN;
 810
 811         for (i = 0; i < req->n_match_sets; i++) {
 812                 profile = &profile_cfg->profiles[i];
 813                 profile->ssid_index = i;
 814                 /* Support any cipher and auth algorithm */
 815                 profile->unicast_cipher = 0xff;
 816                 profile->auth_alg = 0xff;
 817                 profile->network_type = IWL_NETWORK_TYPE_ANY;
 818                 profile->band_selection = IWL_SCAN_OFFLOAD_SELECT_ANY;
 819                 profile->client_bitmap = SCAN_CLIENT_SCHED_SCAN;
 820         }
 821
 822         IWL_DEBUG_SCAN(mvm, "Sending scheduled scan profile config\n");
 823
 824         ret = iwl_mvm_send_cmd(mvm, &cmd);
 825         kfree(profile_cfg);
 826 free_blacklist:
 827         kfree(blacklist);
 828
 829         return ret;
 830 }
 831
 832 int iwl_mvm_sched_scan_start(struct iwl_mvm *mvm,
 833                              struct cfg80211_sched_scan_request *req)
 834 {
 835         struct iwl_scan_offload_req scan_req = {
 836                 .watchdog = IWL_SCHED_SCAN_WATCHDOG,
 837
 838                 .schedule_line[0].iterations = IWL_FAST_SCHED_SCAN_ITERATIONS,
 839                 .schedule_line[0].delay = req->interval / 1000,
 840                 .schedule_line[0].full_scan_mul = 1,
 841
 842                 .schedule_line[1].iterations = 0xff,
 843                 .schedule_line[1].delay = req->interval / 1000,
 844                 .schedule_line[1].full_scan_mul = IWL_FULL_SCAN_MULTIPLIER,
 845         };
 846
 847         if (req->n_match_sets && req->match_sets[0].ssid.ssid_len) {
 848                 IWL_DEBUG_SCAN(mvm,
 849                                "Sending scheduled scan with filtering, filter len %d\n",
 850                                req->n_match_sets);
 851         } else {
 852                 IWL_DEBUG_SCAN(mvm,
 853                                "Sending Scheduled scan without filtering\n");
 854                 scan_req.flags |= cpu_to_le16(IWL_SCAN_OFFLOAD_FLAG_PASS_ALL);
 855         }
 856
 857         return iwl_mvm_send_cmd_pdu(mvm, SCAN_OFFLOAD_REQUEST_CMD, CMD_SYNC,
 858                                     sizeof(scan_req), &scan_req);
 859 }
 860
 861 static int iwl_mvm_send_sched_scan_abort(struct iwl_mvm *mvm)
 862 {
 863         int ret;
 864         struct iwl_host_cmd cmd = {
 865                 .id = SCAN_OFFLOAD_ABORT_CMD,
 866                 .flags = CMD_SYNC,
 867         };
 868         u32 status;
 869
 870         /* Exit instantly with error when device is not ready
 871          * to receive scan abort command or it does not perform
 872          * scheduled scan currently */
 873         if (mvm->scan_status != IWL_MVM_SCAN_SCHED)
 874                 return -EIO;
 875
 876         ret = iwl_mvm_send_cmd_status(mvm, &cmd, &status);
 877         if (ret)
 878                 return ret;
 879
 880         if (status != CAN_ABORT_STATUS) {
 881                 /*
 882                  * The scan abort will return 1 for success or
 883                  * 2 for "failure".  A failure condition can be
 884                  * due to simply not being in an active scan which
 885                  * can occur if we send the scan abort before the
 886                  * microcode has notified us that a scan is completed.
 887                  */
 888                 IWL_DEBUG_SCAN(mvm, "SCAN OFFLOAD ABORT ret %d.\n", status);
 889                 ret = -EIO;
 890         }
 891
 892         return ret;
 893 }
 894
 895 void iwl_mvm_sched_scan_stop(struct iwl_mvm *mvm)
 896 {
 897         int ret;
 898
 899         lockdep_assert_held(&mvm->mutex);
 900
 901         if (mvm->scan_status != IWL_MVM_SCAN_SCHED) {
 902                 IWL_DEBUG_SCAN(mvm, "No offloaded scan to stop\n");
 903                 return;
 904         }
 905
 906         ret = iwl_mvm_send_sched_scan_abort(mvm);
 907         if (ret)
 908                 IWL_DEBUG_SCAN(mvm, "Send stop offload scan failed %d\n", ret);
 909         else
 910                 IWL_DEBUG_SCAN(mvm, "Successfully sent stop offload scan\n");
 911 }