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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * This file is part of wl1271
   4  *
   5  * Copyright (C) 2009-2010 Nokia Corporation
   6  *
   7  * Contact: Luciano Coelho <luciano.coelho@nokia.com>
   8  */
   9
  10 #include <linux/ieee80211.h>
  11 #include <linux/pm_runtime.h>
  12
  13 #include "wlcore.h"
  14 #include "debug.h"
  15 #include "cmd.h"
  16 #include "scan.h"
  17 #include "acx.h"
  18 #include "tx.h"
  19
  20 void wl1271_scan_complete_work(struct work_struct *work)
  21 {
  22         struct delayed_work *dwork;
  23         struct wl1271 *wl;
  24         struct wl12xx_vif *wlvif;
  25         struct cfg80211_scan_info info = {
  26                 .aborted = false,
  27         };
  28         int ret;
  29
  30         dwork = to_delayed_work(work);
  31         wl = container_of(dwork, struct wl1271, scan_complete_work);
  32
  33         wl1271_debug(DEBUG_SCAN, "Scanning complete");
  34
  35         mutex_lock(&wl->mutex);
  36
  37         if (unlikely(wl->state != WLCORE_STATE_ON))
  38                 goto out;
  39
  40         if (wl->scan.state == WL1271_SCAN_STATE_IDLE)
  41                 goto out;
  42
  43         wlvif = wl->scan_wlvif;
  44
  45         /*
  46          * Rearm the tx watchdog just before idling scan. This
  47          * prevents just-finished scans from triggering the watchdog
  48          */
  49         wl12xx_rearm_tx_watchdog_locked(wl);
  50
  51         wl->scan.state = WL1271_SCAN_STATE_IDLE;
  52         memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));
  53         wl->scan.req = NULL;
  54         wl->scan_wlvif = NULL;
  55
  56         ret = pm_runtime_resume_and_get(wl->dev);
  57         if (ret < 0)
  58                 goto out;
  59
  60         if (test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags)) {
  61                 /* restore hardware connection monitoring template */
  62                 wl1271_cmd_build_ap_probe_req(wl, wlvif, wlvif->probereq);
  63         }
  64
  65         if (wl->scan.failed) {
  66                 wl1271_info("Scan completed due to error.");
  67                 wl12xx_queue_recovery_work(wl);
  68         }
  69
  70         wlcore_cmd_regdomain_config_locked(wl);
  71
  72         pm_runtime_mark_last_busy(wl->dev);
  73         pm_runtime_put_autosuspend(wl->dev);
  74
  75         ieee80211_scan_completed(wl->hw, &info);
  76
  77 out:
  78         mutex_unlock(&wl->mutex);
  79
  80 }
  81
  82 static void wlcore_started_vifs_iter(void *data, u8 *mac,
  83                                      struct ieee80211_vif *vif)
  84 {
  85         struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
  86         bool active = false;
  87         int *count = (int *)data;
  88
  89         /*
  90          * count active interfaces according to interface type.
  91          * checking only bss_conf.idle is bad for some cases, e.g.
  92          * we don't want to count sta in p2p_find as active interface.
  93          */
  94         switch (wlvif->bss_type) {
  95         case BSS_TYPE_STA_BSS:
  96                 if (test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags))
  97                         active = true;
  98                 break;
  99
 100         case BSS_TYPE_AP_BSS:
 101                 if (wlvif->wl->active_sta_count > 0)
 102                         active = true;
 103                 break;
 104
 105         default:
 106                 break;
 107         }
 108
 109         if (active)
 110                 (*count)++;
 111 }
 112
 113 static int wlcore_count_started_vifs(struct wl1271 *wl)
 114 {
 115         int count = 0;
 116
 117         ieee80211_iterate_active_interfaces_atomic(wl->hw,
 118                                         IEEE80211_IFACE_ITER_RESUME_ALL,
 119                                         wlcore_started_vifs_iter, &count);
 120         return count;
 121 }
 122
 123 static int
 124 wlcore_scan_get_channels(struct wl1271 *wl,
 125                          struct ieee80211_channel *req_channels[],
 126                          u32 n_channels,
 127                          u32 n_ssids,
 128                          struct conn_scan_ch_params *channels,
 129                          u32 band, bool radar, bool passive,
 130                          int start, int max_channels,
 131                          u8 *n_pactive_ch,
 132                          int scan_type)
 133 {
 134         int i, j;
 135         u32 flags;
 136         bool force_passive = !n_ssids;
 137         u32 min_dwell_time_active, max_dwell_time_active;
 138         u32 dwell_time_passive, dwell_time_dfs;
 139
 140         /* configure dwell times according to scan type */
 141         if (scan_type == SCAN_TYPE_SEARCH) {
 142                 struct conf_scan_settings *c = &wl->conf.scan;
 143                 bool active_vif_exists = !!wlcore_count_started_vifs(wl);
 144
 145                 min_dwell_time_active = active_vif_exists ?
 146                         c->min_dwell_time_active :
 147                         c->min_dwell_time_active_long;
 148                 max_dwell_time_active = active_vif_exists ?
 149                         c->max_dwell_time_active :
 150                         c->max_dwell_time_active_long;
 151                 dwell_time_passive = c->dwell_time_passive;
 152                 dwell_time_dfs = c->dwell_time_dfs;
 153         } else {
 154                 struct conf_sched_scan_settings *c = &wl->conf.sched_scan;
 155                 u32 delta_per_probe;
 156
 157                 if (band == NL80211_BAND_5GHZ)
 158                         delta_per_probe = c->dwell_time_delta_per_probe_5;
 159                 else
 160                         delta_per_probe = c->dwell_time_delta_per_probe;
 161
 162                 min_dwell_time_active = c->base_dwell_time +
 163                          n_ssids * c->num_probe_reqs * delta_per_probe;
 164
 165                 max_dwell_time_active = min_dwell_time_active +
 166                                         c->max_dwell_time_delta;
 167                 dwell_time_passive = c->dwell_time_passive;
 168                 dwell_time_dfs = c->dwell_time_dfs;
 169         }
 170         min_dwell_time_active = DIV_ROUND_UP(min_dwell_time_active, 1000);
 171         max_dwell_time_active = DIV_ROUND_UP(max_dwell_time_active, 1000);
 172         dwell_time_passive = DIV_ROUND_UP(dwell_time_passive, 1000);
 173         dwell_time_dfs = DIV_ROUND_UP(dwell_time_dfs, 1000);
 174
 175         for (i = 0, j = start;
 176              i < n_channels && j < max_channels;
 177              i++) {
 178                 flags = req_channels[i]->flags;
 179
 180                 if (force_passive)
 181                         flags |= IEEE80211_CHAN_NO_IR;
 182
 183                 if ((req_channels[i]->band == band) &&
 184                     !(flags & IEEE80211_CHAN_DISABLED) &&
 185                     (!!(flags & IEEE80211_CHAN_RADAR) == radar) &&
 186                     /* if radar is set, we ignore the passive flag */
 187                     (radar ||
 188                      !!(flags & IEEE80211_CHAN_NO_IR) == passive)) {
 189                         if (flags & IEEE80211_CHAN_RADAR) {
 190                                 channels[j].flags |= SCAN_CHANNEL_FLAGS_DFS;
 191
 192                                 channels[j].passive_duration =
 193                                         cpu_to_le16(dwell_time_dfs);
 194                         } else {
 195                                 channels[j].passive_duration =
 196                                         cpu_to_le16(dwell_time_passive);
 197                         }
 198
 199                         channels[j].min_duration =
 200                                 cpu_to_le16(min_dwell_time_active);
 201                         channels[j].max_duration =
 202                                 cpu_to_le16(max_dwell_time_active);
 203
 204                         channels[j].tx_power_att = req_channels[i]->max_power;
 205                         channels[j].channel = req_channels[i]->hw_value;
 206
 207                         if (n_pactive_ch &&
 208                             (band == NL80211_BAND_2GHZ) &&
 209                             (channels[j].channel >= 12) &&
 210                             (channels[j].channel <= 14) &&
 211                             (flags & IEEE80211_CHAN_NO_IR) &&
 212                             !force_passive) {
 213                                 /* pactive channels treated as DFS */
 214                                 channels[j].flags = SCAN_CHANNEL_FLAGS_DFS;
 215
 216                                 /*
 217                                  * n_pactive_ch is counted down from the end of
 218                                  * the passive channel list
 219                                  */
 220                                 (*n_pactive_ch)++;
 221                                 wl1271_debug(DEBUG_SCAN, "n_pactive_ch = %d",
 222                                              *n_pactive_ch);
 223                         }
 224
 225                         wl1271_debug(DEBUG_SCAN, "freq %d, ch. %d, flags 0x%x, power %d, min/max_dwell %d/%d%s%s",
 226                                      req_channels[i]->center_freq,
 227                                      req_channels[i]->hw_value,
 228                                      req_channels[i]->flags,
 229                                      req_channels[i]->max_power,
 230                                      min_dwell_time_active,
 231                                      max_dwell_time_active,
 232                                      flags & IEEE80211_CHAN_RADAR ?
 233                                         ", DFS" : "",
 234                                      flags & IEEE80211_CHAN_NO_IR ?
 235                                         ", NO-IR" : "");
 236                         j++;
 237                 }
 238         }
 239
 240         return j - start;
 241 }
 242
 243 bool
 244 wlcore_set_scan_chan_params(struct wl1271 *wl,
 245                             struct wlcore_scan_channels *cfg,
 246                             struct ieee80211_channel *channels[],
 247                             u32 n_channels,
 248                             u32 n_ssids,
 249                             int scan_type)
 250 {
 251         u8 n_pactive_ch = 0;
 252
 253         cfg->passive[0] =
 254                 wlcore_scan_get_channels(wl,
 255                                          channels,
 256                                          n_channels,
 257                                          n_ssids,
 258                                          cfg->channels_2,
 259                                          NL80211_BAND_2GHZ,
 260                                          false, true, 0,
 261                                          MAX_CHANNELS_2GHZ,
 262                                          &n_pactive_ch,
 263                                          scan_type);
 264         cfg->active[0] =
 265                 wlcore_scan_get_channels(wl,
 266                                          channels,
 267                                          n_channels,
 268                                          n_ssids,
 269                                          cfg->channels_2,
 270                                          NL80211_BAND_2GHZ,
 271                                          false, false,
 272                                          cfg->passive[0],
 273                                          MAX_CHANNELS_2GHZ,
 274                                          &n_pactive_ch,
 275                                          scan_type);
 276         cfg->passive[1] =
 277                 wlcore_scan_get_channels(wl,
 278                                          channels,
 279                                          n_channels,
 280                                          n_ssids,
 281                                          cfg->channels_5,
 282                                          NL80211_BAND_5GHZ,
 283                                          false, true, 0,
 284                                          wl->max_channels_5,
 285                                          &n_pactive_ch,
 286                                          scan_type);
 287         cfg->dfs =
 288                 wlcore_scan_get_channels(wl,
 289                                          channels,
 290                                          n_channels,
 291                                          n_ssids,
 292                                          cfg->channels_5,
 293                                          NL80211_BAND_5GHZ,
 294                                          true, true,
 295                                          cfg->passive[1],
 296                                          wl->max_channels_5,
 297                                          &n_pactive_ch,
 298                                          scan_type);
 299         cfg->active[1] =
 300                 wlcore_scan_get_channels(wl,
 301                                          channels,
 302                                          n_channels,
 303                                          n_ssids,
 304                                          cfg->channels_5,
 305                                          NL80211_BAND_5GHZ,
 306                                          false, false,
 307                                          cfg->passive[1] + cfg->dfs,
 308                                          wl->max_channels_5,
 309                                          &n_pactive_ch,
 310                                          scan_type);
 311
 312         /* 802.11j channels are not supported yet */
 313         cfg->passive[2] = 0;
 314         cfg->active[2] = 0;
 315
 316         cfg->passive_active = n_pactive_ch;
 317
 318         wl1271_debug(DEBUG_SCAN, "    2.4GHz: active %d passive %d",
 319                      cfg->active[0], cfg->passive[0]);
 320         wl1271_debug(DEBUG_SCAN, "    5GHz: active %d passive %d",
 321                      cfg->active[1], cfg->passive[1]);
 322         wl1271_debug(DEBUG_SCAN, "    DFS: %d", cfg->dfs);
 323
 324         return  cfg->passive[0] || cfg->active[0] ||
 325                 cfg->passive[1] || cfg->active[1] || cfg->dfs ||
 326                 cfg->passive[2] || cfg->active[2];
 327 }
 328 EXPORT_SYMBOL_GPL(wlcore_set_scan_chan_params);
 329
 330 int wlcore_scan(struct wl1271 *wl, struct ieee80211_vif *vif,
 331                 const u8 *ssid, size_t ssid_len,
 332                 struct cfg80211_scan_request *req)
 333 {
 334         struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
 335
 336         /*
 337          * cfg80211 should guarantee that we don't get more channels
 338          * than what we have registered.
 339          */
 340         BUG_ON(req->n_channels > WL1271_MAX_CHANNELS);
 341
 342         if (wl->scan.state != WL1271_SCAN_STATE_IDLE)
 343                 return -EBUSY;
 344
 345         wl->scan.state = WL1271_SCAN_STATE_2GHZ_ACTIVE;
 346
 347         if (ssid_len && ssid) {
 348                 wl->scan.ssid_len = ssid_len;
 349                 memcpy(wl->scan.ssid, ssid, ssid_len);
 350         } else {
 351                 wl->scan.ssid_len = 0;
 352         }
 353
 354         wl->scan_wlvif = wlvif;
 355         wl->scan.req = req;
 356         memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));
 357
 358         /* we assume failure so that timeout scenarios are handled correctly */
 359         wl->scan.failed = true;
 360         ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
 361                                      msecs_to_jiffies(WL1271_SCAN_TIMEOUT));
 362
 363         wl->ops->scan_start(wl, wlvif, req);
 364
 365         return 0;
 366 }
 367 /* Returns the scan type to be used or a negative value on error */
 368 int
 369 wlcore_scan_sched_scan_ssid_list(struct wl1271 *wl,
 370                                  struct wl12xx_vif *wlvif,
 371                                  struct cfg80211_sched_scan_request *req)
 372 {
 373         struct wl1271_cmd_sched_scan_ssid_list *cmd = NULL;
 374         struct cfg80211_match_set *sets = req->match_sets;
 375         struct cfg80211_ssid *ssids = req->ssids;
 376         int ret = 0, type, i, j, n_match_ssids = 0;
 377
 378         wl1271_debug((DEBUG_CMD | DEBUG_SCAN), "cmd sched scan ssid list");
 379
 380         /* count the match sets that contain SSIDs */
 381         for (i = 0; i < req->n_match_sets; i++)
 382                 if (sets[i].ssid.ssid_len > 0)
 383                         n_match_ssids++;
 384
 385         /* No filter, no ssids or only bcast ssid */
 386         if (!n_match_ssids &&
 387             (!req->n_ssids ||
 388              (req->n_ssids == 1 && req->ssids[0].ssid_len == 0))) {
 389                 type = SCAN_SSID_FILTER_ANY;
 390                 goto out;
 391         }
 392
 393         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 394         if (!cmd) {
 395                 ret = -ENOMEM;
 396                 goto out;
 397         }
 398
 399         cmd->role_id = wlvif->role_id;
 400         if (!n_match_ssids) {
 401                 /* No filter, with ssids */
 402                 type = SCAN_SSID_FILTER_DISABLED;
 403
 404                 for (i = 0; i < req->n_ssids; i++) {
 405                         cmd->ssids[cmd->n_ssids].type = (ssids[i].ssid_len) ?
 406                                 SCAN_SSID_TYPE_HIDDEN : SCAN_SSID_TYPE_PUBLIC;
 407                         cmd->ssids[cmd->n_ssids].len = ssids[i].ssid_len;
 408                         memcpy(cmd->ssids[cmd->n_ssids].ssid, ssids[i].ssid,
 409                                ssids[i].ssid_len);
 410                         cmd->n_ssids++;
 411                 }
 412         } else {
 413                 type = SCAN_SSID_FILTER_LIST;
 414
 415                 /* Add all SSIDs from the filters */
 416                 for (i = 0; i < req->n_match_sets; i++) {
 417                         /* ignore sets without SSIDs */
 418                         if (!sets[i].ssid.ssid_len)
 419                                 continue;
 420
 421                         cmd->ssids[cmd->n_ssids].type = SCAN_SSID_TYPE_PUBLIC;
 422                         cmd->ssids[cmd->n_ssids].len = sets[i].ssid.ssid_len;
 423                         memcpy(cmd->ssids[cmd->n_ssids].ssid,
 424                                sets[i].ssid.ssid, sets[i].ssid.ssid_len);
 425                         cmd->n_ssids++;
 426                 }
 427                 if ((req->n_ssids > 1) ||
 428                     (req->n_ssids == 1 && req->ssids[0].ssid_len > 0)) {
 429                         /*
 430                          * Mark all the SSIDs passed in the SSID list as HIDDEN,
 431                          * so they're used in probe requests.
 432                          */
 433                         for (i = 0; i < req->n_ssids; i++) {
 434                                 if (!req->ssids[i].ssid_len)
 435                                         continue;
 436
 437                                 for (j = 0; j < cmd->n_ssids; j++)
 438                                         if ((req->ssids[i].ssid_len ==
 439                                              cmd->ssids[j].len) &&
 440                                             !memcmp(req->ssids[i].ssid,
 441                                                    cmd->ssids[j].ssid,
 442                                                    req->ssids[i].ssid_len)) {
 443                                                 cmd->ssids[j].type =
 444                                                         SCAN_SSID_TYPE_HIDDEN;
 445                                                 break;
 446                                         }
 447                                 /* Fail if SSID isn't present in the filters */
 448                                 if (j == cmd->n_ssids) {
 449                                         ret = -EINVAL;
 450                                         goto out_free;
 451                                 }
 452                         }
 453                 }
 454         }
 455
 456         ret = wl1271_cmd_send(wl, CMD_CONNECTION_SCAN_SSID_CFG, cmd,
 457                               sizeof(*cmd), 0);
 458         if (ret < 0) {
 459                 wl1271_error("cmd sched scan ssid list failed");
 460                 goto out_free;
 461         }
 462
 463 out_free:
 464         kfree(cmd);
 465 out:
 466         if (ret < 0)
 467                 return ret;
 468         return type;
 469 }
 470 EXPORT_SYMBOL_GPL(wlcore_scan_sched_scan_ssid_list);
 471
 472 void wlcore_scan_sched_scan_results(struct wl1271 *wl)
 473 {
 474         wl1271_debug(DEBUG_SCAN, "got periodic scan results");
 475
 476         ieee80211_sched_scan_results(wl->hw);
 477 }
 478 EXPORT_SYMBOL_GPL(wlcore_scan_sched_scan_results);