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
  74 struct iwl_mvm_scan_params {
  75         u32 max_out_time;
  76         u32 suspend_time;
  77         bool passive_fragmented;
  78         struct _dwell {
  79                 u16 passive;
  80                 u16 active;
  81         } dwell[IEEE80211_NUM_BANDS];
  82 };
  83
  84 static inline __le16 iwl_mvm_scan_rx_chain(struct iwl_mvm *mvm)
  85 {
  86         u16 rx_chain;
  87         u8 rx_ant;
  88
  89         if (mvm->scan_rx_ant != ANT_NONE)
  90                 rx_ant = mvm->scan_rx_ant;
  91         else
  92                 rx_ant = mvm->fw->valid_rx_ant;
  93         rx_chain = rx_ant << PHY_RX_CHAIN_VALID_POS;
  94         rx_chain |= rx_ant << PHY_RX_CHAIN_FORCE_MIMO_SEL_POS;
  95         rx_chain |= rx_ant << PHY_RX_CHAIN_FORCE_SEL_POS;
  96         rx_chain |= 0x1 << PHY_RX_CHAIN_DRIVER_FORCE_POS;
  97         return cpu_to_le16(rx_chain);
  98 }
  99
 100 static inline __le32
 101 iwl_mvm_scan_rxon_flags(struct cfg80211_scan_request *req)
 102 {
 103         if (req->channels[0]->band == IEEE80211_BAND_2GHZ)
 104                 return cpu_to_le32(PHY_BAND_24);
 105         else
 106                 return cpu_to_le32(PHY_BAND_5);
 107 }
 108
 109 static inline __le32
 110 iwl_mvm_scan_rate_n_flags(struct iwl_mvm *mvm, enum ieee80211_band band,
 111                           bool no_cck)
 112 {
 113         u32 tx_ant;
 114
 115         mvm->scan_last_antenna_idx =
 116                 iwl_mvm_next_antenna(mvm, mvm->fw->valid_tx_ant,
 117                                      mvm->scan_last_antenna_idx);
 118         tx_ant = BIT(mvm->scan_last_antenna_idx) << RATE_MCS_ANT_POS;
 119
 120         if (band == IEEE80211_BAND_2GHZ && !no_cck)
 121                 return cpu_to_le32(IWL_RATE_1M_PLCP | RATE_MCS_CCK_MSK |
 122                                    tx_ant);
 123         else
 124                 return cpu_to_le32(IWL_RATE_6M_PLCP | tx_ant);
 125 }
 126
 127 /*
 128  * We insert the SSIDs in an inverted order, because the FW will
 129  * invert it back. The most prioritized SSID, which is first in the
 130  * request list, is not copied here, but inserted directly to the probe
 131  * request.
 132  */
 133 static void iwl_mvm_scan_fill_ssids(struct iwl_scan_cmd *cmd,
 134                                     struct cfg80211_scan_request *req,
 135                                     int first)
 136 {
 137         int fw_idx, req_idx;
 138
 139         for (req_idx = req->n_ssids - 1, fw_idx = 0; req_idx >= first;
 140              req_idx--, fw_idx++) {
 141                 cmd->direct_scan[fw_idx].id = WLAN_EID_SSID;
 142                 cmd->direct_scan[fw_idx].len = req->ssids[req_idx].ssid_len;
 143                 memcpy(cmd->direct_scan[fw_idx].ssid,
 144                        req->ssids[req_idx].ssid,
 145                        req->ssids[req_idx].ssid_len);
 146         }
 147 }
 148
 149 /*
 150  * If req->n_ssids > 0, it means we should do an active scan.
 151  * In case of active scan w/o directed scan, we receive a zero-length SSID
 152  * just to notify that this scan is active and not passive.
 153  * In order to notify the FW of the number of SSIDs we wish to scan (including
 154  * the zero-length one), we need to set the corresponding bits in chan->type,
 155  * one for each SSID, and set the active bit (first). If the first SSID is
 156  * already included in the probe template, so we need to set only
 157  * req->n_ssids - 1 bits in addition to the first bit.
 158  */
 159 static u16 iwl_mvm_get_active_dwell(enum ieee80211_band band, int n_ssids)
 160 {
 161         if (band == IEEE80211_BAND_2GHZ)
 162                 return 30  + 3 * (n_ssids + 1);
 163         return 20  + 2 * (n_ssids + 1);
 164 }
 165
 166 static u16 iwl_mvm_get_passive_dwell(enum ieee80211_band band)
 167 {
 168         return band == IEEE80211_BAND_2GHZ ? 100 + 20 : 100 + 10;
 169 }
 170
 171 static void iwl_mvm_scan_fill_channels(struct iwl_scan_cmd *cmd,
 172                                        struct cfg80211_scan_request *req,
 173                                        bool basic_ssid,
 174                                        struct iwl_mvm_scan_params *params)
 175 {
 176         struct iwl_scan_channel *chan = (struct iwl_scan_channel *)
 177                 (cmd->data + le16_to_cpu(cmd->tx_cmd.len));
 178         int i;
 179         int type = BIT(req->n_ssids) - 1;
 180         enum ieee80211_band band = req->channels[0]->band;
 181
 182         if (!basic_ssid)
 183                 type |= BIT(req->n_ssids);
 184
 185         for (i = 0; i < cmd->channel_count; i++) {
 186                 chan->channel = cpu_to_le16(req->channels[i]->hw_value);
 187                 chan->type = cpu_to_le32(type);
 188                 if (req->channels[i]->flags & IEEE80211_CHAN_NO_IR)
 189                         chan->type &= cpu_to_le32(~SCAN_CHANNEL_TYPE_ACTIVE);
 190                 chan->active_dwell = cpu_to_le16(params->dwell[band].active);
 191                 chan->passive_dwell = cpu_to_le16(params->dwell[band].passive);
 192                 chan->iteration_count = cpu_to_le16(1);
 193                 chan++;
 194         }
 195 }
 196
 197 /*
 198  * Fill in probe request with the following parameters:
 199  * TA is our vif HW address, which mac80211 ensures we have.
 200  * Packet is broadcasted, so this is both SA and DA.
 201  * The probe request IE is made out of two: first comes the most prioritized
 202  * SSID if a directed scan is requested. Second comes whatever extra
 203  * information was given to us as the scan request IE.
 204  */
 205 static u16 iwl_mvm_fill_probe_req(struct ieee80211_mgmt *frame, const u8 *ta,
 206                                   int n_ssids, const u8 *ssid, int ssid_len,
 207                                   const u8 *ie, int ie_len,
 208                                   int left)
 209 {
 210         int len = 0;
 211         u8 *pos = NULL;
 212
 213         /* Make sure there is enough space for the probe request,
 214          * two mandatory IEs and the data */
 215         left -= 24;
 216         if (left < 0)
 217                 return 0;
 218
 219         frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
 220         eth_broadcast_addr(frame->da);
 221         memcpy(frame->sa, ta, ETH_ALEN);
 222         eth_broadcast_addr(frame->bssid);
 223         frame->seq_ctrl = 0;
 224
 225         len += 24;
 226
 227         /* for passive scans, no need to fill anything */
 228         if (n_ssids == 0)
 229                 return (u16)len;
 230
 231         /* points to the payload of the request */
 232         pos = &frame->u.probe_req.variable[0];
 233
 234         /* fill in our SSID IE */
 235         left -= ssid_len + 2;
 236         if (left < 0)
 237                 return 0;
 238         *pos++ = WLAN_EID_SSID;
 239         *pos++ = ssid_len;
 240         if (ssid && ssid_len) { /* ssid_len may be == 0 even if ssid is valid */
 241                 memcpy(pos, ssid, ssid_len);
 242                 pos += ssid_len;
 243         }
 244
 245         len += ssid_len + 2;
 246
 247         if (WARN_ON(left < ie_len))
 248                 return len;
 249
 250         if (ie && ie_len) {
 251                 memcpy(pos, ie, ie_len);
 252                 len += ie_len;
 253         }
 254
 255         return (u16)len;
 256 }
 257
 258 static void iwl_mvm_scan_condition_iterator(void *data, u8 *mac,
 259                                             struct ieee80211_vif *vif)
 260 {
 261         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 262         bool *global_bound = data;
 263
 264         if (mvmvif->phy_ctxt && mvmvif->phy_ctxt->id < MAX_PHYS)
 265                 *global_bound = true;
 266 }
 267
 268 static void iwl_mvm_scan_calc_params(struct iwl_mvm *mvm,
 269                                      struct ieee80211_vif *vif,
 270                                      int n_ssids,
 271                                      struct iwl_mvm_scan_params *params)
 272 {
 273         bool global_bound = false;
 274         enum ieee80211_band band;
 275
 276         ieee80211_iterate_active_interfaces_atomic(mvm->hw,
 277                                             IEEE80211_IFACE_ITER_NORMAL,
 278                                             iwl_mvm_scan_condition_iterator,
 279                                             &global_bound);
 280         /*
 281          * Under low latency traffic passive scan is fragmented meaning
 282          * that dwell on a particular channel will be fragmented. Each fragment
 283          * dwell time is 20ms and fragments period is 105ms. Skipping to next
 284          * channel will be delayed by the same period - 105ms. So suspend_time
 285          * parameter describing both fragments and channels skipping periods is
 286          * set to 105ms. This value is chosen so that overall passive scan
 287          * duration will not be too long. Max_out_time in this case is set to
 288          * 70ms, so for active scanning operating channel will be left for 70ms
 289          * while for passive still for 20ms (fragment dwell).
 290          */
 291         if (global_bound) {
 292                 if (!iwl_mvm_low_latency(mvm)) {
 293                         params->suspend_time = ieee80211_tu_to_usec(100);
 294                         params->max_out_time = ieee80211_tu_to_usec(600);
 295                 } else {
 296                         params->suspend_time = ieee80211_tu_to_usec(105);
 297                         /* P2P doesn't support fragmented passive scan, so
 298                          * configure max_out_time to be at least longest dwell
 299                          * time for passive scan.
 300                          */
 301                         if (vif->type == NL80211_IFTYPE_STATION && !vif->p2p) {
 302                                 params->max_out_time = ieee80211_tu_to_usec(70);
 303                                 params->passive_fragmented = true;
 304                         } else {
 305                                 u32 passive_dwell;
 306
 307                                 /*
 308                                  * Use band G so that passive channel dwell time
 309                                  * will be assigned with maximum value.
 310                                  */
 311                                 band = IEEE80211_BAND_2GHZ;
 312                                 passive_dwell = iwl_mvm_get_passive_dwell(band);
 313                                 params->max_out_time =
 314                                         ieee80211_tu_to_usec(passive_dwell);
 315                         }
 316                 }
 317         }
 318
 319         for (band = IEEE80211_BAND_2GHZ; band < IEEE80211_NUM_BANDS; band++) {
 320                 if (params->passive_fragmented)
 321                         params->dwell[band].passive = 20;
 322                 else
 323                         params->dwell[band].passive =
 324                                 iwl_mvm_get_passive_dwell(band);
 325                 params->dwell[band].active = iwl_mvm_get_active_dwell(band,
 326                                                                       n_ssids);
 327         }
 328 }
 329
 330 int iwl_mvm_scan_request(struct iwl_mvm *mvm,
 331                          struct ieee80211_vif *vif,
 332                          struct cfg80211_scan_request *req)
 333 {
 334         struct iwl_host_cmd hcmd = {
 335                 .id = SCAN_REQUEST_CMD,
 336                 .len = { 0, },
 337                 .data = { mvm->scan_cmd, },
 338                 .flags = CMD_SYNC,
 339                 .dataflags = { IWL_HCMD_DFL_NOCOPY, },
 340         };
 341         struct iwl_scan_cmd *cmd = mvm->scan_cmd;
 342         int ret;
 343         u32 status;
 344         int ssid_len = 0;
 345         u8 *ssid = NULL;
 346         bool basic_ssid = !(mvm->fw->ucode_capa.flags &
 347                            IWL_UCODE_TLV_FLAGS_NO_BASIC_SSID);
 348         struct iwl_mvm_scan_params params = {};
 349
 350         lockdep_assert_held(&mvm->mutex);
 351
 352         /* we should have failed registration if scan_cmd was NULL */
 353         if (WARN_ON(mvm->scan_cmd == NULL))
 354                 return -ENOMEM;
 355
 356         IWL_DEBUG_SCAN(mvm, "Handling mac80211 scan request\n");
 357         mvm->scan_status = IWL_MVM_SCAN_OS;
 358         memset(cmd, 0, sizeof(struct iwl_scan_cmd) +
 359                mvm->fw->ucode_capa.max_probe_length +
 360                (MAX_NUM_SCAN_CHANNELS * sizeof(struct iwl_scan_channel)));
 361
 362         cmd->channel_count = (u8)req->n_channels;
 363         cmd->quiet_time = cpu_to_le16(IWL_ACTIVE_QUIET_TIME);
 364         cmd->quiet_plcp_th = cpu_to_le16(IWL_PLCP_QUIET_THRESH);
 365         cmd->rxchain_sel_flags = iwl_mvm_scan_rx_chain(mvm);
 366
 367         iwl_mvm_scan_calc_params(mvm, vif, req->n_ssids, &params);
 368         cmd->max_out_time = cpu_to_le32(params.max_out_time);
 369         cmd->suspend_time = cpu_to_le32(params.suspend_time);
 370         if (params.passive_fragmented)
 371                 cmd->scan_flags |= SCAN_FLAGS_FRAGMENTED_SCAN;
 372
 373         cmd->rxon_flags = iwl_mvm_scan_rxon_flags(req);
 374         cmd->filter_flags = cpu_to_le32(MAC_FILTER_ACCEPT_GRP |
 375                                         MAC_FILTER_IN_BEACON);
 376
 377         if (vif->type == NL80211_IFTYPE_P2P_DEVICE)
 378                 cmd->type = cpu_to_le32(SCAN_TYPE_DISCOVERY_FORCED);
 379         else
 380                 cmd->type = cpu_to_le32(SCAN_TYPE_FORCED);
 381
 382         cmd->repeats = cpu_to_le32(1);
 383
 384         /*
 385          * If the user asked for passive scan, don't change to active scan if
 386          * you see any activity on the channel - remain passive.
 387          */
 388         if (req->n_ssids > 0) {
 389                 cmd->passive2active = cpu_to_le16(1);
 390                 cmd->scan_flags |= SCAN_FLAGS_PASSIVE2ACTIVE;
 391                 if (basic_ssid) {
 392                         ssid = req->ssids[0].ssid;
 393                         ssid_len = req->ssids[0].ssid_len;
 394                 }
 395         } else {
 396                 cmd->passive2active = 0;
 397                 cmd->scan_flags &= ~SCAN_FLAGS_PASSIVE2ACTIVE;
 398         }
 399
 400         iwl_mvm_scan_fill_ssids(cmd, req, basic_ssid ? 1 : 0);
 401
 402         cmd->tx_cmd.tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL |
 403                                            TX_CMD_FLG_BT_DIS);
 404         cmd->tx_cmd.sta_id = mvm->aux_sta.sta_id;
 405         cmd->tx_cmd.life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
 406         cmd->tx_cmd.rate_n_flags =
 407                         iwl_mvm_scan_rate_n_flags(mvm, req->channels[0]->band,
 408                                                   req->no_cck);
 409
 410         cmd->tx_cmd.len =
 411                 cpu_to_le16(iwl_mvm_fill_probe_req(
 412                             (struct ieee80211_mgmt *)cmd->data,
 413                             vif->addr,
 414                             req->n_ssids, ssid, ssid_len,
 415                             req->ie, req->ie_len,
 416                             mvm->fw->ucode_capa.max_probe_length));
 417
 418         iwl_mvm_scan_fill_channels(cmd, req, basic_ssid, &params);
 419
 420         cmd->len = cpu_to_le16(sizeof(struct iwl_scan_cmd) +
 421                 le16_to_cpu(cmd->tx_cmd.len) +
 422                 (cmd->channel_count * sizeof(struct iwl_scan_channel)));
 423         hcmd.len[0] = le16_to_cpu(cmd->len);
 424
 425         status = SCAN_RESPONSE_OK;
 426         ret = iwl_mvm_send_cmd_status(mvm, &hcmd, &status);
 427         if (!ret && status == SCAN_RESPONSE_OK) {
 428                 IWL_DEBUG_SCAN(mvm, "Scan request was sent successfully\n");
 429         } else {
 430                 /*
 431                  * If the scan failed, it usually means that the FW was unable
 432                  * to allocate the time events. Warn on it, but maybe we
 433                  * should try to send the command again with different params.
 434                  */
 435                 IWL_ERR(mvm, "Scan failed! status 0x%x ret %d\n",
 436                         status, ret);
 437                 mvm->scan_status = IWL_MVM_SCAN_NONE;
 438                 ret = -EIO;
 439         }
 440         return ret;
 441 }
 442
 443 int iwl_mvm_rx_scan_response(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 444                           struct iwl_device_cmd *cmd)
 445 {
 446         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 447         struct iwl_cmd_response *resp = (void *)pkt->data;
 448
 449         IWL_DEBUG_SCAN(mvm, "Scan response received. status 0x%x\n",
 450                        le32_to_cpu(resp->status));
 451         return 0;
 452 }
 453
 454 int iwl_mvm_rx_scan_complete(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 455                           struct iwl_device_cmd *cmd)
 456 {
 457         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 458         struct iwl_scan_complete_notif *notif = (void *)pkt->data;
 459
 460         lockdep_assert_held(&mvm->mutex);
 461
 462         IWL_DEBUG_SCAN(mvm, "Scan complete: status=0x%x scanned channels=%d\n",
 463                        notif->status, notif->scanned_channels);
 464
 465         if (mvm->scan_status == IWL_MVM_SCAN_OS)
 466                 mvm->scan_status = IWL_MVM_SCAN_NONE;
 467         ieee80211_scan_completed(mvm->hw, notif->status != SCAN_COMP_STATUS_OK);
 468
 469         iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
 470
 471         return 0;
 472 }
 473
 474 int iwl_mvm_rx_sched_scan_results(struct iwl_mvm *mvm,
 475                                   struct iwl_rx_cmd_buffer *rxb,
 476                                   struct iwl_device_cmd *cmd)
 477 {
 478         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 479         struct iwl_sched_scan_results *notif = (void *)pkt->data;
 480
 481         if (notif->client_bitmap & SCAN_CLIENT_SCHED_SCAN) {
 482                 IWL_DEBUG_SCAN(mvm, "Scheduled scan results\n");
 483                 ieee80211_sched_scan_results(mvm->hw);
 484         }
 485
 486         return 0;
 487 }
 488
 489 static bool iwl_mvm_scan_abort_notif(struct iwl_notif_wait_data *notif_wait,
 490                                      struct iwl_rx_packet *pkt, void *data)
 491 {
 492         struct iwl_mvm *mvm =
 493                 container_of(notif_wait, struct iwl_mvm, notif_wait);
 494         struct iwl_scan_complete_notif *notif;
 495         u32 *resp;
 496
 497         switch (pkt->hdr.cmd) {
 498         case SCAN_ABORT_CMD:
 499                 resp = (void *)pkt->data;
 500                 if (*resp == CAN_ABORT_STATUS) {
 501                         IWL_DEBUG_SCAN(mvm,
 502                                        "Scan can be aborted, wait until completion\n");
 503                         return false;
 504                 }
 505
 506                 /*
 507                  * If scan cannot be aborted, it means that we had a
 508                  * SCAN_COMPLETE_NOTIFICATION in the pipe and it called
 509                  * ieee80211_scan_completed already.
 510                  */
 511                 IWL_DEBUG_SCAN(mvm, "Scan cannot be aborted, exit now: %d\n",
 512                                *resp);
 513                 return true;
 514
 515         case SCAN_COMPLETE_NOTIFICATION:
 516                 notif = (void *)pkt->data;
 517                 IWL_DEBUG_SCAN(mvm, "Scan aborted: status 0x%x\n",
 518                                notif->status);
 519                 return true;
 520
 521         default:
 522                 WARN_ON(1);
 523                 return false;
 524         };
 525 }
 526
 527 int iwl_mvm_cancel_scan(struct iwl_mvm *mvm)
 528 {
 529         struct iwl_notification_wait wait_scan_abort;
 530         static const u8 scan_abort_notif[] = { SCAN_ABORT_CMD,
 531                                                SCAN_COMPLETE_NOTIFICATION };
 532         int ret;
 533
 534         if (mvm->scan_status == IWL_MVM_SCAN_NONE)
 535                 return 0;
 536
 537         if (iwl_mvm_is_radio_killed(mvm)) {
 538                 ieee80211_scan_completed(mvm->hw, true);
 539                 iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
 540                 mvm->scan_status = IWL_MVM_SCAN_NONE;
 541                 return 0;
 542         }
 543
 544         iwl_init_notification_wait(&mvm->notif_wait, &wait_scan_abort,
 545                                    scan_abort_notif,
 546                                    ARRAY_SIZE(scan_abort_notif),
 547                                    iwl_mvm_scan_abort_notif, NULL);
 548
 549         ret = iwl_mvm_send_cmd_pdu(mvm, SCAN_ABORT_CMD, CMD_SYNC, 0, NULL);
 550         if (ret) {
 551                 IWL_ERR(mvm, "Couldn't send SCAN_ABORT_CMD: %d\n", ret);
 552                 /* mac80211's state will be cleaned in the nic_restart flow */
 553                 goto out_remove_notif;
 554         }
 555
 556         return iwl_wait_notification(&mvm->notif_wait, &wait_scan_abort, HZ);
 557
 558 out_remove_notif:
 559         iwl_remove_notification(&mvm->notif_wait, &wait_scan_abort);
 560         return ret;
 561 }
 562
 563 int iwl_mvm_rx_scan_offload_complete_notif(struct iwl_mvm *mvm,
 564                                            struct iwl_rx_cmd_buffer *rxb,
 565                                            struct iwl_device_cmd *cmd)
 566 {
 567         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 568         struct iwl_scan_offload_complete *scan_notif = (void *)pkt->data;
 569
 570         /* scan status must be locked for proper checking */
 571         lockdep_assert_held(&mvm->mutex);
 572
 573         IWL_DEBUG_SCAN(mvm,
 574                        "Scheduled scan completed, status %s EBS status %s:%d\n",
 575                        scan_notif->status == IWL_SCAN_OFFLOAD_COMPLETED ?
 576                        "completed" : "aborted", scan_notif->ebs_status ==
 577                        IWL_SCAN_EBS_SUCCESS ? "success" : "failed",
 578                        scan_notif->ebs_status);
 579
 580
 581         /* only call mac80211 completion if the stop was initiated by FW */
 582         if (mvm->scan_status == IWL_MVM_SCAN_SCHED) {
 583                 mvm->scan_status = IWL_MVM_SCAN_NONE;
 584                 ieee80211_sched_scan_stopped(mvm->hw);
 585         }
 586
 587         mvm->last_ebs_successful = !scan_notif->ebs_status;
 588
 589         return 0;
 590 }
 591
 592 static void iwl_scan_offload_build_tx_cmd(struct iwl_mvm *mvm,
 593                                           struct ieee80211_vif *vif,
 594                                           struct ieee80211_sched_scan_ies *ies,
 595                                           enum ieee80211_band band,
 596                                           struct iwl_tx_cmd *cmd,
 597                                           u8 *data)
 598 {
 599         u16 cmd_len;
 600
 601         cmd->tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL);
 602         cmd->life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
 603         cmd->sta_id = mvm->aux_sta.sta_id;
 604
 605         cmd->rate_n_flags = iwl_mvm_scan_rate_n_flags(mvm, band, false);
 606
 607         cmd_len = iwl_mvm_fill_probe_req((struct ieee80211_mgmt *)data,
 608                                          vif->addr,
 609                                          1, NULL, 0,
 610                                          ies->ie[band], ies->len[band],
 611                                          SCAN_OFFLOAD_PROBE_REQ_SIZE);
 612         cmd->len = cpu_to_le16(cmd_len);
 613 }
 614
 615 static void iwl_build_scan_cmd(struct iwl_mvm *mvm,
 616                                struct ieee80211_vif *vif,
 617                                struct cfg80211_sched_scan_request *req,
 618                                struct iwl_scan_offload_cmd *scan,
 619                                struct iwl_mvm_scan_params *params)
 620 {
 621         scan->channel_count =
 622                 mvm->nvm_data->bands[IEEE80211_BAND_2GHZ].n_channels +
 623                 mvm->nvm_data->bands[IEEE80211_BAND_5GHZ].n_channels;
 624         scan->quiet_time = cpu_to_le16(IWL_ACTIVE_QUIET_TIME);
 625         scan->quiet_plcp_th = cpu_to_le16(IWL_PLCP_QUIET_THRESH);
 626         scan->good_CRC_th = IWL_GOOD_CRC_TH_DEFAULT;
 627         scan->rx_chain = iwl_mvm_scan_rx_chain(mvm);
 628
 629         scan->max_out_time = cpu_to_le32(params->max_out_time);
 630         scan->suspend_time = cpu_to_le32(params->suspend_time);
 631
 632         scan->filter_flags |= cpu_to_le32(MAC_FILTER_ACCEPT_GRP |
 633                                           MAC_FILTER_IN_BEACON);
 634         scan->scan_type = cpu_to_le32(SCAN_TYPE_BACKGROUND);
 635         scan->rep_count = cpu_to_le32(1);
 636
 637         if (params->passive_fragmented)
 638                 scan->scan_flags |= SCAN_FLAGS_FRAGMENTED_SCAN;
 639 }
 640
 641 static int iwl_ssid_exist(u8 *ssid, u8 ssid_len, struct iwl_ssid_ie *ssid_list)
 642 {
 643         int i;
 644
 645         for (i = 0; i < PROBE_OPTION_MAX; i++) {
 646                 if (!ssid_list[i].len)
 647                         break;
 648                 if (ssid_list[i].len == ssid_len &&
 649                     !memcmp(ssid_list->ssid, ssid, ssid_len))
 650                         return i;
 651         }
 652         return -1;
 653 }
 654
 655 static void iwl_scan_offload_build_ssid(struct cfg80211_sched_scan_request *req,
 656                                         struct iwl_scan_offload_cmd *scan,
 657                                         u32 *ssid_bitmap)
 658 {
 659         int i, j;
 660         int index;
 661
 662         /*
 663          * copy SSIDs from match list.
 664          * iwl_config_sched_scan_profiles() uses the order of these ssids to
 665          * config match list.
 666          */
 667         for (i = 0; i < req->n_match_sets && i < PROBE_OPTION_MAX; i++) {
 668                 /* skip empty SSID matchsets */
 669                 if (!req->match_sets[i].ssid.ssid_len)
 670                         continue;
 671                 scan->direct_scan[i].id = WLAN_EID_SSID;
 672                 scan->direct_scan[i].len = req->match_sets[i].ssid.ssid_len;
 673                 memcpy(scan->direct_scan[i].ssid, req->match_sets[i].ssid.ssid,
 674                        scan->direct_scan[i].len);
 675         }
 676
 677         /* add SSIDs from scan SSID list */
 678         *ssid_bitmap = 0;
 679         for (j = 0; j < req->n_ssids && i < PROBE_OPTION_MAX; j++) {
 680                 index = iwl_ssid_exist(req->ssids[j].ssid,
 681                                        req->ssids[j].ssid_len,
 682                                        scan->direct_scan);
 683                 if (index < 0) {
 684                         if (!req->ssids[j].ssid_len)
 685                                 continue;
 686                         scan->direct_scan[i].id = WLAN_EID_SSID;
 687                         scan->direct_scan[i].len = req->ssids[j].ssid_len;
 688                         memcpy(scan->direct_scan[i].ssid, req->ssids[j].ssid,
 689                                scan->direct_scan[i].len);
 690                         *ssid_bitmap |= BIT(i + 1);
 691                         i++;
 692                 } else {
 693                         *ssid_bitmap |= BIT(index + 1);
 694                 }
 695         }
 696 }
 697
 698 static void iwl_build_channel_cfg(struct iwl_mvm *mvm,
 699                                   struct cfg80211_sched_scan_request *req,
 700                                   struct iwl_scan_channel_cfg *channels,
 701                                   enum ieee80211_band band,
 702                                   int *head, int *tail,
 703                                   u32 ssid_bitmap,
 704                                   struct iwl_mvm_scan_params *params)
 705 {
 706         struct ieee80211_supported_band *s_band;
 707         int n_channels = req->n_channels;
 708         int i, j, index = 0;
 709         bool partial;
 710
 711         /*
 712          * We have to configure all supported channels, even if we don't want to
 713          * scan on them, but we have to send channels in the order that we want
 714          * to scan. So add requested channels to head of the list and others to
 715          * the end.
 716         */
 717         s_band = &mvm->nvm_data->bands[band];
 718
 719         for (i = 0; i < s_band->n_channels && *head <= *tail; i++) {
 720                 partial = false;
 721                 for (j = 0; j < n_channels; j++)
 722                         if (s_band->channels[i].center_freq ==
 723                                                 req->channels[j]->center_freq) {
 724                                 index = *head;
 725                                 (*head)++;
 726                                 /*
 727                                  * Channels that came with the request will be
 728                                  * in partial scan .
 729                                  */
 730                                 partial = true;
 731                                 break;
 732                         }
 733                 if (!partial) {
 734                         index = *tail;
 735                         (*tail)--;
 736                 }
 737                 channels->channel_number[index] =
 738                         cpu_to_le16(ieee80211_frequency_to_channel(
 739                                         s_band->channels[i].center_freq));
 740                 channels->dwell_time[index][0] = params->dwell[band].active;
 741                 channels->dwell_time[index][1] = params->dwell[band].passive;
 742
 743                 channels->iter_count[index] = cpu_to_le16(1);
 744                 channels->iter_interval[index] = 0;
 745
 746                 if (!(s_band->channels[i].flags & IEEE80211_CHAN_NO_IR))
 747                         channels->type[index] |=
 748                                 cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_ACTIVE);
 749
 750                 channels->type[index] |=
 751                                 cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_FULL);
 752                 if (partial)
 753                         channels->type[index] |=
 754                                 cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_PARTIAL);
 755
 756                 if (s_band->channels[i].flags & IEEE80211_CHAN_NO_HT40)
 757                         channels->type[index] |=
 758                                 cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_NARROW);
 759
 760                 /* scan for all SSIDs from req->ssids */
 761                 channels->type[index] |= cpu_to_le32(ssid_bitmap);
 762         }
 763 }
 764
 765 int iwl_mvm_config_sched_scan(struct iwl_mvm *mvm,
 766                               struct ieee80211_vif *vif,
 767                               struct cfg80211_sched_scan_request *req,
 768                               struct ieee80211_sched_scan_ies *ies)
 769 {
 770         int band_2ghz = mvm->nvm_data->bands[IEEE80211_BAND_2GHZ].n_channels;
 771         int band_5ghz = mvm->nvm_data->bands[IEEE80211_BAND_5GHZ].n_channels;
 772         int head = 0;
 773         int tail = band_2ghz + band_5ghz;
 774         u32 ssid_bitmap;
 775         int cmd_len;
 776         int ret;
 777
 778         struct iwl_scan_offload_cfg *scan_cfg;
 779         struct iwl_host_cmd cmd = {
 780                 .id = SCAN_OFFLOAD_CONFIG_CMD,
 781                 .flags = CMD_SYNC,
 782         };
 783         struct iwl_mvm_scan_params params = {};
 784
 785         lockdep_assert_held(&mvm->mutex);
 786
 787         cmd_len = sizeof(struct iwl_scan_offload_cfg) +
 788                   2 * SCAN_OFFLOAD_PROBE_REQ_SIZE;
 789
 790         scan_cfg = kzalloc(cmd_len, GFP_KERNEL);
 791         if (!scan_cfg)
 792                 return -ENOMEM;
 793
 794         iwl_mvm_scan_calc_params(mvm, vif, req->n_ssids, &params);
 795         iwl_build_scan_cmd(mvm, vif, req, &scan_cfg->scan_cmd, &params);
 796         scan_cfg->scan_cmd.len = cpu_to_le16(cmd_len);
 797
 798         iwl_scan_offload_build_ssid(req, &scan_cfg->scan_cmd, &ssid_bitmap);
 799         /* build tx frames for supported bands */
 800         if (band_2ghz) {
 801                 iwl_scan_offload_build_tx_cmd(mvm, vif, ies,
 802                                               IEEE80211_BAND_2GHZ,
 803                                               &scan_cfg->scan_cmd.tx_cmd[0],
 804                                               scan_cfg->data);
 805                 iwl_build_channel_cfg(mvm, req, &scan_cfg->channel_cfg,
 806                                       IEEE80211_BAND_2GHZ, &head, &tail,
 807                                       ssid_bitmap, &params);
 808         }
 809         if (band_5ghz) {
 810                 iwl_scan_offload_build_tx_cmd(mvm, vif, ies,
 811                                               IEEE80211_BAND_5GHZ,
 812                                               &scan_cfg->scan_cmd.tx_cmd[1],
 813                                               scan_cfg->data +
 814                                                 SCAN_OFFLOAD_PROBE_REQ_SIZE);
 815                 iwl_build_channel_cfg(mvm, req, &scan_cfg->channel_cfg,
 816                                       IEEE80211_BAND_5GHZ, &head, &tail,
 817                                       ssid_bitmap, &params);
 818         }
 819
 820         cmd.data[0] = scan_cfg;
 821         cmd.len[0] = cmd_len;
 822         cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
 823
 824         IWL_DEBUG_SCAN(mvm, "Sending scheduled scan config\n");
 825
 826         ret = iwl_mvm_send_cmd(mvm, &cmd);
 827         kfree(scan_cfg);
 828         return ret;
 829 }
 830
 831 int iwl_mvm_config_sched_scan_profiles(struct iwl_mvm *mvm,
 832                                        struct cfg80211_sched_scan_request *req)
 833 {
 834         struct iwl_scan_offload_profile *profile;
 835         struct iwl_scan_offload_profile_cfg *profile_cfg;
 836         struct iwl_scan_offload_blacklist *blacklist;
 837         struct iwl_host_cmd cmd = {
 838                 .id = SCAN_OFFLOAD_UPDATE_PROFILES_CMD,
 839                 .flags = CMD_SYNC,
 840                 .len[1] = sizeof(*profile_cfg),
 841                 .dataflags[0] = IWL_HCMD_DFL_NOCOPY,
 842                 .dataflags[1] = IWL_HCMD_DFL_NOCOPY,
 843         };
 844         int blacklist_len;
 845         int i;
 846         int ret;
 847
 848         if (WARN_ON(req->n_match_sets > IWL_SCAN_MAX_PROFILES))
 849                         return -EIO;
 850
 851         if (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_SHORT_BL)
 852                 blacklist_len = IWL_SCAN_SHORT_BLACKLIST_LEN;
 853         else
 854                 blacklist_len = IWL_SCAN_MAX_BLACKLIST_LEN;
 855
 856         blacklist = kzalloc(sizeof(*blacklist) * blacklist_len, GFP_KERNEL);
 857         if (!blacklist)
 858                 return -ENOMEM;
 859
 860         profile_cfg = kzalloc(sizeof(*profile_cfg), GFP_KERNEL);
 861         if (!profile_cfg) {
 862                 ret = -ENOMEM;
 863                 goto free_blacklist;
 864         }
 865
 866         cmd.data[0] = blacklist;
 867         cmd.len[0] = sizeof(*blacklist) * blacklist_len;
 868         cmd.data[1] = profile_cfg;
 869
 870         /* No blacklist configuration */
 871
 872         profile_cfg->num_profiles = req->n_match_sets;
 873         profile_cfg->active_clients = SCAN_CLIENT_SCHED_SCAN;
 874         profile_cfg->pass_match = SCAN_CLIENT_SCHED_SCAN;
 875         profile_cfg->match_notify = SCAN_CLIENT_SCHED_SCAN;
 876         if (!req->n_match_sets || !req->match_sets[0].ssid.ssid_len)
 877                 profile_cfg->any_beacon_notify = SCAN_CLIENT_SCHED_SCAN;
 878
 879         for (i = 0; i < req->n_match_sets; i++) {
 880                 profile = &profile_cfg->profiles[i];
 881                 profile->ssid_index = i;
 882                 /* Support any cipher and auth algorithm */
 883                 profile->unicast_cipher = 0xff;
 884                 profile->auth_alg = 0xff;
 885                 profile->network_type = IWL_NETWORK_TYPE_ANY;
 886                 profile->band_selection = IWL_SCAN_OFFLOAD_SELECT_ANY;
 887                 profile->client_bitmap = SCAN_CLIENT_SCHED_SCAN;
 888         }
 889
 890         IWL_DEBUG_SCAN(mvm, "Sending scheduled scan profile config\n");
 891
 892         ret = iwl_mvm_send_cmd(mvm, &cmd);
 893         kfree(profile_cfg);
 894 free_blacklist:
 895         kfree(blacklist);
 896
 897         return ret;
 898 }
 899
 900 int iwl_mvm_sched_scan_start(struct iwl_mvm *mvm,
 901                              struct cfg80211_sched_scan_request *req)
 902 {
 903         struct iwl_scan_offload_req scan_req = {
 904                 .watchdog = IWL_SCHED_SCAN_WATCHDOG,
 905
 906                 .schedule_line[0].iterations = IWL_FAST_SCHED_SCAN_ITERATIONS,
 907                 .schedule_line[0].delay = req->interval / 1000,
 908                 .schedule_line[0].full_scan_mul = 1,
 909
 910                 .schedule_line[1].iterations = 0xff,
 911                 .schedule_line[1].delay = req->interval / 1000,
 912                 .schedule_line[1].full_scan_mul = IWL_FULL_SCAN_MULTIPLIER,
 913         };
 914
 915         if (req->n_match_sets && req->match_sets[0].ssid.ssid_len) {
 916                 IWL_DEBUG_SCAN(mvm,
 917                                "Sending scheduled scan with filtering, filter len %d\n",
 918                                req->n_match_sets);
 919         } else {
 920                 IWL_DEBUG_SCAN(mvm,
 921                                "Sending Scheduled scan without filtering\n");
 922                 scan_req.flags |= cpu_to_le16(IWL_SCAN_OFFLOAD_FLAG_PASS_ALL);
 923         }
 924
 925         if (mvm->last_ebs_successful &&
 926             mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_EBS_SUPPORT)
 927                 scan_req.flags |=
 928                         cpu_to_le16(IWL_SCAN_OFFLOAD_FLAG_EBS_ACCURATE_MODE);
 929
 930         return iwl_mvm_send_cmd_pdu(mvm, SCAN_OFFLOAD_REQUEST_CMD, CMD_SYNC,
 931                                     sizeof(scan_req), &scan_req);
 932 }
 933
 934 static int iwl_mvm_send_sched_scan_abort(struct iwl_mvm *mvm)
 935 {
 936         int ret;
 937         struct iwl_host_cmd cmd = {
 938                 .id = SCAN_OFFLOAD_ABORT_CMD,
 939                 .flags = CMD_SYNC,
 940         };
 941         u32 status;
 942
 943         /* Exit instantly with error when device is not ready
 944          * to receive scan abort command or it does not perform
 945          * scheduled scan currently */
 946         if (mvm->scan_status != IWL_MVM_SCAN_SCHED)
 947                 return -EIO;
 948
 949         ret = iwl_mvm_send_cmd_status(mvm, &cmd, &status);
 950         if (ret)
 951                 return ret;
 952
 953         if (status != CAN_ABORT_STATUS) {
 954                 /*
 955                  * The scan abort will return 1 for success or
 956                  * 2 for "failure".  A failure condition can be
 957                  * due to simply not being in an active scan which
 958                  * can occur if we send the scan abort before the
 959                  * microcode has notified us that a scan is completed.
 960                  */
 961                 IWL_DEBUG_SCAN(mvm, "SCAN OFFLOAD ABORT ret %d.\n", status);
 962                 ret = -ENOENT;
 963         }
 964
 965         return ret;
 966 }
 967
 968 int iwl_mvm_sched_scan_stop(struct iwl_mvm *mvm)
 969 {
 970         int ret;
 971         struct iwl_notification_wait wait_scan_done;
 972         static const u8 scan_done_notif[] = { SCAN_OFFLOAD_COMPLETE, };
 973
 974         lockdep_assert_held(&mvm->mutex);
 975
 976         if (mvm->scan_status != IWL_MVM_SCAN_SCHED) {
 977                 IWL_DEBUG_SCAN(mvm, "No offloaded scan to stop\n");
 978                 return 0;
 979         }
 980
 981         iwl_init_notification_wait(&mvm->notif_wait, &wait_scan_done,
 982                                    scan_done_notif,
 983                                    ARRAY_SIZE(scan_done_notif),
 984                                    NULL, NULL);
 985
 986         ret = iwl_mvm_send_sched_scan_abort(mvm);
 987         if (ret) {
 988                 IWL_DEBUG_SCAN(mvm, "Send stop offload scan failed %d\n", ret);
 989                 iwl_remove_notification(&mvm->notif_wait, &wait_scan_done);
 990                 return ret;
 991         }
 992
 993         IWL_DEBUG_SCAN(mvm, "Successfully sent stop offload scan\n");
 994
 995         ret = iwl_wait_notification(&mvm->notif_wait, &wait_scan_done, 1 * HZ);
 996         if (ret)
 997                 return ret;
 998
 999         /*
1000          * Clear the scan status so the next scan requests will succeed. This
1001          * also ensures the Rx handler doesn't do anything, as the scan was
1002          * stopped from above.
1003          */
1004         mvm->scan_status = IWL_MVM_SCAN_NONE;
1005
1006         return 0;
1007 }