drivers/net/wireless/ti/wl12xx/scan.c

   1 /*
   2  * This file is part of wl12xx
   3  *
   4  * Copyright (C) 2012 Texas Instruments. All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * version 2 as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  18  * 02110-1301 USA
  19  *
  20  */
  21
  22 #include <linux/ieee80211.h>
  23 #include "scan.h"
  24 #include "../wlcore/debug.h"
  25 #include "../wlcore/tx.h"
  26
  27 static int wl1271_get_scan_channels(struct wl1271 *wl,
  28                                     struct cfg80211_scan_request *req,
  29                                     struct basic_scan_channel_params *channels,
  30                                     enum ieee80211_band band, bool passive)
  31 {
  32         struct conf_scan_settings *c = &wl->conf.scan;
  33         int i, j;
  34         u32 flags;
  35
  36         for (i = 0, j = 0;
  37              i < req->n_channels && j < WL1271_SCAN_MAX_CHANNELS;
  38              i++) {
  39                 flags = req->channels[i]->flags;
  40
  41                 if (!test_bit(i, wl->scan.scanned_ch) &&
  42                     !(flags & IEEE80211_CHAN_DISABLED) &&
  43                     (req->channels[i]->band == band) &&
  44                     /*
  45                      * In passive scans, we scan all remaining
  46                      * channels, even if not marked as such.
  47                      * In active scans, we only scan channels not
  48                      * marked as passive.
  49                      */
  50                     (passive || !(flags & IEEE80211_CHAN_NO_IR))) {
  51                         wl1271_debug(DEBUG_SCAN, "band %d, center_freq %d ",
  52                                      req->channels[i]->band,
  53                                      req->channels[i]->center_freq);
  54                         wl1271_debug(DEBUG_SCAN, "hw_value %d, flags %X",
  55                                      req->channels[i]->hw_value,
  56                                      req->channels[i]->flags);
  57                         wl1271_debug(DEBUG_SCAN,
  58                                      "max_antenna_gain %d, max_power %d",
  59                                      req->channels[i]->max_antenna_gain,
  60                                      req->channels[i]->max_power);
  61                         wl1271_debug(DEBUG_SCAN, "beacon_found %d",
  62                                      req->channels[i]->beacon_found);
  63
  64                         if (!passive) {
  65                                 channels[j].min_duration =
  66                                         cpu_to_le32(c->min_dwell_time_active);
  67                                 channels[j].max_duration =
  68                                         cpu_to_le32(c->max_dwell_time_active);
  69                         } else {
  70                                 channels[j].min_duration =
  71                                         cpu_to_le32(c->dwell_time_passive);
  72                                 channels[j].max_duration =
  73                                         cpu_to_le32(c->dwell_time_passive);
  74                         }
  75                         channels[j].early_termination = 0;
  76                         channels[j].tx_power_att = req->channels[i]->max_power;
  77                         channels[j].channel = req->channels[i]->hw_value;
  78
  79                         memset(&channels[j].bssid_lsb, 0xff, 4);
  80                         memset(&channels[j].bssid_msb, 0xff, 2);
  81
  82                         /* Mark the channels we already used */
  83                         set_bit(i, wl->scan.scanned_ch);
  84
  85                         j++;
  86                 }
  87         }
  88
  89         return j;
  90 }
  91
  92 #define WL1271_NOTHING_TO_SCAN 1
  93
  94 static int wl1271_scan_send(struct wl1271 *wl, struct wl12xx_vif *wlvif,
  95                             enum ieee80211_band band,
  96                             bool passive, u32 basic_rate)
  97 {
  98         struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif);
  99         struct wl1271_cmd_scan *cmd;
 100         struct wl1271_cmd_trigger_scan_to *trigger;
 101         int ret;
 102         u16 scan_options = 0;
 103
 104         /* skip active scans if we don't have SSIDs */
 105         if (!passive && wl->scan.req->n_ssids == 0)
 106                 return WL1271_NOTHING_TO_SCAN;
 107
 108         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 109         trigger = kzalloc(sizeof(*trigger), GFP_KERNEL);
 110         if (!cmd || !trigger) {
 111                 ret = -ENOMEM;
 112                 goto out;
 113         }
 114
 115         if (wl->conf.scan.split_scan_timeout)
 116                 scan_options |= WL1271_SCAN_OPT_SPLIT_SCAN;
 117
 118         if (passive)
 119                 scan_options |= WL1271_SCAN_OPT_PASSIVE;
 120
 121         /* scan on the dev role if the regular one is not started */
 122         if (wlcore_is_p2p_mgmt(wlvif))
 123                 cmd->params.role_id = wlvif->dev_role_id;
 124         else
 125                 cmd->params.role_id = wlvif->role_id;
 126
 127         if (WARN_ON(cmd->params.role_id == WL12XX_INVALID_ROLE_ID)) {
 128                 ret = -EINVAL;
 129                 goto out;
 130         }
 131
 132         cmd->params.scan_options = cpu_to_le16(scan_options);
 133
 134         cmd->params.n_ch = wl1271_get_scan_channels(wl, wl->scan.req,
 135                                                     cmd->channels,
 136                                                     band, passive);
 137         if (cmd->params.n_ch == 0) {
 138                 ret = WL1271_NOTHING_TO_SCAN;
 139                 goto out;
 140         }
 141
 142         cmd->params.tx_rate = cpu_to_le32(basic_rate);
 143         cmd->params.n_probe_reqs = wl->conf.scan.num_probe_reqs;
 144         cmd->params.tid_trigger = CONF_TX_AC_ANY_TID;
 145         cmd->params.scan_tag = WL1271_SCAN_DEFAULT_TAG;
 146
 147         if (band == IEEE80211_BAND_2GHZ)
 148                 cmd->params.band = WL1271_SCAN_BAND_2_4_GHZ;
 149         else
 150                 cmd->params.band = WL1271_SCAN_BAND_5_GHZ;
 151
 152         if (wl->scan.ssid_len && wl->scan.ssid) {
 153                 cmd->params.ssid_len = wl->scan.ssid_len;
 154                 memcpy(cmd->params.ssid, wl->scan.ssid, wl->scan.ssid_len);
 155         }
 156
 157         memcpy(cmd->addr, vif->addr, ETH_ALEN);
 158
 159         ret = wl12xx_cmd_build_probe_req(wl, wlvif,
 160                                          cmd->params.role_id, band,
 161                                          wl->scan.ssid, wl->scan.ssid_len,
 162                                          wl->scan.req->ie,
 163                                          wl->scan.req->ie_len, NULL, 0, false);
 164         if (ret < 0) {
 165                 wl1271_error("PROBE request template failed");
 166                 goto out;
 167         }
 168
 169         trigger->timeout = cpu_to_le32(wl->conf.scan.split_scan_timeout);
 170         ret = wl1271_cmd_send(wl, CMD_TRIGGER_SCAN_TO, trigger,
 171                               sizeof(*trigger), 0);
 172         if (ret < 0) {
 173                 wl1271_error("trigger scan to failed for hw scan");
 174                 goto out;
 175         }
 176
 177         wl1271_dump(DEBUG_SCAN, "SCAN: ", cmd, sizeof(*cmd));
 178
 179         ret = wl1271_cmd_send(wl, CMD_SCAN, cmd, sizeof(*cmd), 0);
 180         if (ret < 0) {
 181                 wl1271_error("SCAN failed");
 182                 goto out;
 183         }
 184
 185 out:
 186         kfree(cmd);
 187         kfree(trigger);
 188         return ret;
 189 }
 190
 191 int wl12xx_scan_stop(struct wl1271 *wl, struct wl12xx_vif *wlvif)
 192 {
 193         struct wl1271_cmd_header *cmd = NULL;
 194         int ret = 0;
 195
 196         if (WARN_ON(wl->scan.state == WL1271_SCAN_STATE_IDLE))
 197                 return -EINVAL;
 198
 199         wl1271_debug(DEBUG_CMD, "cmd scan stop");
 200
 201         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 202         if (!cmd) {
 203                 ret = -ENOMEM;
 204                 goto out;
 205         }
 206
 207         ret = wl1271_cmd_send(wl, CMD_STOP_SCAN, cmd,
 208                               sizeof(*cmd), 0);
 209         if (ret < 0) {
 210                 wl1271_error("cmd stop_scan failed");
 211                 goto out;
 212         }
 213 out:
 214         kfree(cmd);
 215         return ret;
 216 }
 217
 218 void wl1271_scan_stm(struct wl1271 *wl, struct wl12xx_vif *wlvif)
 219 {
 220         int ret = 0;
 221         enum ieee80211_band band;
 222         u32 rate, mask;
 223
 224         switch (wl->scan.state) {
 225         case WL1271_SCAN_STATE_IDLE:
 226                 break;
 227
 228         case WL1271_SCAN_STATE_2GHZ_ACTIVE:
 229                 band = IEEE80211_BAND_2GHZ;
 230                 mask = wlvif->bitrate_masks[band];
 231                 if (wl->scan.req->no_cck) {
 232                         mask &= ~CONF_TX_CCK_RATES;
 233                         if (!mask)
 234                                 mask = CONF_TX_RATE_MASK_BASIC_P2P;
 235                 }
 236                 rate = wl1271_tx_min_rate_get(wl, mask);
 237                 ret = wl1271_scan_send(wl, wlvif, band, false, rate);
 238                 if (ret == WL1271_NOTHING_TO_SCAN) {
 239                         wl->scan.state = WL1271_SCAN_STATE_2GHZ_PASSIVE;
 240                         wl1271_scan_stm(wl, wlvif);
 241                 }
 242
 243                 break;
 244
 245         case WL1271_SCAN_STATE_2GHZ_PASSIVE:
 246                 band = IEEE80211_BAND_2GHZ;
 247                 mask = wlvif->bitrate_masks[band];
 248                 if (wl->scan.req->no_cck) {
 249                         mask &= ~CONF_TX_CCK_RATES;
 250                         if (!mask)
 251                                 mask = CONF_TX_RATE_MASK_BASIC_P2P;
 252                 }
 253                 rate = wl1271_tx_min_rate_get(wl, mask);
 254                 ret = wl1271_scan_send(wl, wlvif, band, true, rate);
 255                 if (ret == WL1271_NOTHING_TO_SCAN) {
 256                         if (wl->enable_11a)
 257                                 wl->scan.state = WL1271_SCAN_STATE_5GHZ_ACTIVE;
 258                         else
 259                                 wl->scan.state = WL1271_SCAN_STATE_DONE;
 260                         wl1271_scan_stm(wl, wlvif);
 261                 }
 262
 263                 break;
 264
 265         case WL1271_SCAN_STATE_5GHZ_ACTIVE:
 266                 band = IEEE80211_BAND_5GHZ;
 267                 rate = wl1271_tx_min_rate_get(wl, wlvif->bitrate_masks[band]);
 268                 ret = wl1271_scan_send(wl, wlvif, band, false, rate);
 269                 if (ret == WL1271_NOTHING_TO_SCAN) {
 270                         wl->scan.state = WL1271_SCAN_STATE_5GHZ_PASSIVE;
 271                         wl1271_scan_stm(wl, wlvif);
 272                 }
 273
 274                 break;
 275
 276         case WL1271_SCAN_STATE_5GHZ_PASSIVE:
 277                 band = IEEE80211_BAND_5GHZ;
 278                 rate = wl1271_tx_min_rate_get(wl, wlvif->bitrate_masks[band]);
 279                 ret = wl1271_scan_send(wl, wlvif, band, true, rate);
 280                 if (ret == WL1271_NOTHING_TO_SCAN) {
 281                         wl->scan.state = WL1271_SCAN_STATE_DONE;
 282                         wl1271_scan_stm(wl, wlvif);
 283                 }
 284
 285                 break;
 286
 287         case WL1271_SCAN_STATE_DONE:
 288                 wl->scan.failed = false;
 289                 cancel_delayed_work(&wl->scan_complete_work);
 290                 ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
 291                                              msecs_to_jiffies(0));
 292                 break;
 293
 294         default:
 295                 wl1271_error("invalid scan state");
 296                 break;
 297         }
 298
 299         if (ret < 0) {
 300                 cancel_delayed_work(&wl->scan_complete_work);
 301                 ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
 302                                              msecs_to_jiffies(0));
 303         }
 304 }
 305
 306 static void wl12xx_adjust_channels(struct wl1271_cmd_sched_scan_config *cmd,
 307                                    struct wlcore_scan_channels *cmd_channels)
 308 {
 309         memcpy(cmd->passive, cmd_channels->passive, sizeof(cmd->passive));
 310         memcpy(cmd->active, cmd_channels->active, sizeof(cmd->active));
 311         cmd->dfs = cmd_channels->dfs;
 312         cmd->n_pactive_ch = cmd_channels->passive_active;
 313
 314         memcpy(cmd->channels_2, cmd_channels->channels_2,
 315                sizeof(cmd->channels_2));
 316         memcpy(cmd->channels_5, cmd_channels->channels_5,
 317                sizeof(cmd->channels_5));
 318         /* channels_4 are not supported, so no need to copy them */
 319 }
 320
 321 int wl1271_scan_sched_scan_config(struct wl1271 *wl,
 322                                   struct wl12xx_vif *wlvif,
 323                                   struct cfg80211_sched_scan_request *req,
 324                                   struct ieee80211_scan_ies *ies)
 325 {
 326         struct wl1271_cmd_sched_scan_config *cfg = NULL;
 327         struct wlcore_scan_channels *cfg_channels = NULL;
 328         struct conf_sched_scan_settings *c = &wl->conf.sched_scan;
 329         int i, ret;
 330         bool force_passive = !req->n_ssids;
 331
 332         wl1271_debug(DEBUG_CMD, "cmd sched_scan scan config");
 333
 334         cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
 335         if (!cfg)
 336                 return -ENOMEM;
 337
 338         cfg->role_id = wlvif->role_id;
 339         cfg->rssi_threshold = c->rssi_threshold;
 340         cfg->snr_threshold  = c->snr_threshold;
 341         cfg->n_probe_reqs = c->num_probe_reqs;
 342         /* cycles set to 0 it means infinite (until manually stopped) */
 343         cfg->cycles = 0;
 344         /* report APs when at least 1 is found */
 345         cfg->report_after = 1;
 346         /* don't stop scanning automatically when something is found */
 347         cfg->terminate = 0;
 348         cfg->tag = WL1271_SCAN_DEFAULT_TAG;
 349         /* don't filter on BSS type */
 350         cfg->bss_type = SCAN_BSS_TYPE_ANY;
 351         /* currently NL80211 supports only a single interval */
 352         for (i = 0; i < SCAN_MAX_CYCLE_INTERVALS; i++)
 353                 cfg->intervals[i] = cpu_to_le32(req->scan_plans[0].interval *
 354                                                 MSEC_PER_SEC);
 355
 356         cfg->ssid_len = 0;
 357         ret = wlcore_scan_sched_scan_ssid_list(wl, wlvif, req);
 358         if (ret < 0)
 359                 goto out;
 360
 361         cfg->filter_type = ret;
 362
 363         wl1271_debug(DEBUG_SCAN, "filter_type = %d", cfg->filter_type);
 364
 365         cfg_channels = kzalloc(sizeof(*cfg_channels), GFP_KERNEL);
 366         if (!cfg_channels) {
 367                 ret = -ENOMEM;
 368                 goto out;
 369         }
 370
 371         if (!wlcore_set_scan_chan_params(wl, cfg_channels, req->channels,
 372                                          req->n_channels, req->n_ssids,
 373                                          SCAN_TYPE_PERIODIC)) {
 374                 wl1271_error("scan channel list is empty");
 375                 ret = -EINVAL;
 376                 goto out;
 377         }
 378         wl12xx_adjust_channels(cfg, cfg_channels);
 379
 380         if (!force_passive && cfg->active[0]) {
 381                 u8 band = IEEE80211_BAND_2GHZ;
 382                 ret = wl12xx_cmd_build_probe_req(wl, wlvif,
 383                                                  wlvif->role_id, band,
 384                                                  req->ssids[0].ssid,
 385                                                  req->ssids[0].ssid_len,
 386                                                  ies->ies[band],
 387                                                  ies->len[band],
 388                                                  ies->common_ies,
 389                                                  ies->common_ie_len,
 390                                                  true);
 391                 if (ret < 0) {
 392                         wl1271_error("2.4GHz PROBE request template failed");
 393                         goto out;
 394                 }
 395         }
 396
 397         if (!force_passive && cfg->active[1]) {
 398                 u8 band = IEEE80211_BAND_5GHZ;
 399                 ret = wl12xx_cmd_build_probe_req(wl, wlvif,
 400                                                  wlvif->role_id, band,
 401                                                  req->ssids[0].ssid,
 402                                                  req->ssids[0].ssid_len,
 403                                                  ies->ies[band],
 404                                                  ies->len[band],
 405                                                  ies->common_ies,
 406                                                  ies->common_ie_len,
 407                                                  true);
 408                 if (ret < 0) {
 409                         wl1271_error("5GHz PROBE request template failed");
 410                         goto out;
 411                 }
 412         }
 413
 414         wl1271_dump(DEBUG_SCAN, "SCAN_CFG: ", cfg, sizeof(*cfg));
 415
 416         ret = wl1271_cmd_send(wl, CMD_CONNECTION_SCAN_CFG, cfg,
 417                               sizeof(*cfg), 0);
 418         if (ret < 0) {
 419                 wl1271_error("SCAN configuration failed");
 420                 goto out;
 421         }
 422 out:
 423         kfree(cfg_channels);
 424         kfree(cfg);
 425         return ret;
 426 }
 427
 428 int wl1271_scan_sched_scan_start(struct wl1271 *wl, struct wl12xx_vif *wlvif)
 429 {
 430         struct wl1271_cmd_sched_scan_start *start;
 431         int ret = 0;
 432
 433         wl1271_debug(DEBUG_CMD, "cmd periodic scan start");
 434
 435         if (wlvif->bss_type != BSS_TYPE_STA_BSS)
 436                 return -EOPNOTSUPP;
 437
 438         if ((wl->quirks & WLCORE_QUIRK_NO_SCHED_SCAN_WHILE_CONN) &&
 439             test_bit(WLVIF_FLAG_IN_USE, &wlvif->flags))
 440                 return -EBUSY;
 441
 442         start = kzalloc(sizeof(*start), GFP_KERNEL);
 443         if (!start)
 444                 return -ENOMEM;
 445
 446         start->role_id = wlvif->role_id;
 447         start->tag = WL1271_SCAN_DEFAULT_TAG;
 448
 449         ret = wl1271_cmd_send(wl, CMD_START_PERIODIC_SCAN, start,
 450                               sizeof(*start), 0);
 451         if (ret < 0) {
 452                 wl1271_error("failed to send scan start command");
 453                 goto out_free;
 454         }
 455
 456 out_free:
 457         kfree(start);
 458         return ret;
 459 }
 460
 461 int wl12xx_sched_scan_start(struct wl1271 *wl, struct wl12xx_vif  *wlvif,
 462                             struct cfg80211_sched_scan_request *req,
 463                             struct ieee80211_scan_ies *ies)
 464 {
 465         int ret;
 466
 467         ret = wl1271_scan_sched_scan_config(wl, wlvif, req, ies);
 468         if (ret < 0)
 469                 return ret;
 470
 471         return wl1271_scan_sched_scan_start(wl, wlvif);
 472 }
 473
 474 void wl12xx_scan_sched_scan_stop(struct wl1271 *wl,  struct wl12xx_vif *wlvif)
 475 {
 476         struct wl1271_cmd_sched_scan_stop *stop;
 477         int ret = 0;
 478
 479         wl1271_debug(DEBUG_CMD, "cmd periodic scan stop");
 480
 481         /* FIXME: what to do if alloc'ing to stop fails? */
 482         stop = kzalloc(sizeof(*stop), GFP_KERNEL);
 483         if (!stop) {
 484                 wl1271_error("failed to alloc memory to send sched scan stop");
 485                 return;
 486         }
 487
 488         stop->role_id = wlvif->role_id;
 489         stop->tag = WL1271_SCAN_DEFAULT_TAG;
 490
 491         ret = wl1271_cmd_send(wl, CMD_STOP_PERIODIC_SCAN, stop,
 492                               sizeof(*stop), 0);
 493         if (ret < 0) {
 494                 wl1271_error("failed to send sched scan stop command");
 495                 goto out_free;
 496         }
 497
 498 out_free:
 499         kfree(stop);
 500 }
 501
 502 int wl12xx_scan_start(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 503                       struct cfg80211_scan_request *req)
 504 {
 505         wl1271_scan_stm(wl, wlvif);
 506         return 0;
 507 }
 508
 509 void wl12xx_scan_completed(struct wl1271 *wl, struct wl12xx_vif *wlvif)
 510 {
 511         wl1271_scan_stm(wl, wlvif);
 512 }