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_get_sync(wl->dev);
  57         if (ret < 0) {
  58                 pm_runtime_put_noidle(wl->dev);
  59                 goto out;
  60         }
  61
  62         if (test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags)) {
  63                 /* restore hardware connection monitoring template */
  64                 wl1271_cmd_build_ap_probe_req(wl, wlvif, wlvif->probereq);
  65         }
  66
  67         if (wl->scan.failed) {
  68                 wl1271_info("Scan completed due to error.");
  69                 wl12xx_queue_recovery_work(wl);
  70         }
  71
  72         wlcore_cmd_regdomain_config_locked(wl);
  73
  74         pm_runtime_mark_last_busy(wl->dev);
  75         pm_runtime_put_autosuspend(wl->dev);
  76
  77         ieee80211_scan_completed(wl->hw, &info);
  78
  79 out:
  80         mutex_unlock(&wl->mutex);
  81
  82 }
  83
  84 static void wlcore_started_vifs_iter(void *data, u8 *mac,
  85                                      struct ieee80211_vif *vif)
  86 {
  87         struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
  88         bool active = false;
  89         int *count = (int *)data;
  90
  91         /*
  92          * count active interfaces according to interface type.
  93          * checking only bss_conf.idle is bad for some cases, e.g.
  94          * we don't want to count sta in p2p_find as active interface.
  95          */
  96         switch (wlvif->bss_type) {
  97         case BSS_TYPE_STA_BSS:
  98                 if (test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags))
  99                         active = true;
 100                 break;
 101
 102         case BSS_TYPE_AP_BSS:
 103                 if (wlvif->wl->active_sta_count > 0)
 104                         active = true;
 105                 break;
 106
 107         default:
 108                 break;
 109         }
 110
 111         if (active)
 112                 (*count)++;
 113 }
 114
 115 static int wlcore_count_started_vifs(struct wl1271 *wl)
 116 {
 117         int count = 0;
 118
 119         ieee80211_iterate_active_interfaces_atomic(wl->hw,
 120                                         IEEE80211_IFACE_ITER_RESUME_ALL,
 121                                         wlcore_started_vifs_iter, &count);
 122         return count;
 123 }
 124
 125 static int
 126 wlcore_scan_get_channels(struct wl1271 *wl,
 127                          struct ieee80211_channel *req_channels[],
 128                          u32 n_channels,
 129                          u32 n_ssids,
 130                          struct conn_scan_ch_params *channels,
 131                          u32 band, bool radar, bool passive,
 132                          int start, int max_channels,
 133                          u8 *n_pactive_ch,
 134                          int scan_type)
 135 {
 136         int i, j;
 137         u32 flags;
 138         bool force_passive = !n_ssids;
 139         u32 min_dwell_time_active, max_dwell_time_active;
 140         u32 dwell_time_passive, dwell_time_dfs;
 141
 142         /* configure dwell times according to scan type */
 143         if (scan_type == SCAN_TYPE_SEARCH) {
 144                 struct conf_scan_settings *c = &wl->conf.scan;
 145                 bool active_vif_exists = !!wlcore_count_started_vifs(wl);
 146
 147                 min_dwell_time_active = active_vif_exists ?
 148                         c->min_dwell_time_active :
 149                         c->min_dwell_time_active_long;
 150                 max_dwell_time_active = active_vif_exists ?
 151                         c->max_dwell_time_active :
 152                         c->max_dwell_time_active_long;
 153                 dwell_time_passive = c->dwell_time_passive;
 154                 dwell_time_dfs = c->dwell_time_dfs;
 155         } else {
 156                 struct conf_sched_scan_settings *c = &wl->conf.sched_scan;
 157                 u32 delta_per_probe;
 158
 159                 if (band == NL80211_BAND_5GHZ)
 160                         delta_per_probe = c->dwell_time_delta_per_probe_5;
 161                 else
 162                         delta_per_probe = c->dwell_time_delta_per_probe;
 163
 164                 min_dwell_time_active = c->base_dwell_time +
 165                          n_ssids * c->num_probe_reqs * delta_per_probe;
 166
 167                 max_dwell_time_active = min_dwell_time_active +
 168                                         c->max_dwell_time_delta;
 169                 dwell_time_passive = c->dwell_time_passive;
 170                 dwell_time_dfs = c->dwell_time_dfs;
 171         }
 172         min_dwell_time_active = DIV_ROUND_UP(min_dwell_time_active, 1000);
 173         max_dwell_time_active = DIV_ROUND_UP(max_dwell_time_active, 1000);
 174         dwell_time_passive = DIV_ROUND_UP(dwell_time_passive, 1000);
 175         dwell_time_dfs = DIV_ROUND_UP(dwell_time_dfs, 1000);
 176
 177         for (i = 0, j = start;
 178              i < n_channels && j < max_channels;
 179              i++) {
 180                 flags = req_channels[i]->flags;
 181
 182                 if (force_passive)
 183                         flags |= IEEE80211_CHAN_NO_IR;
 184
 185                 if ((req_channels[i]->band == band) &&
 186                     !(flags & IEEE80211_CHAN_DISABLED) &&
 187                     (!!(flags & IEEE80211_CHAN_RADAR) == radar) &&
 188                     /* if radar is set, we ignore the passive flag */
 189                     (radar ||
 190                      !!(flags & IEEE80211_CHAN_NO_IR) == passive)) {
 191                         if (flags & IEEE80211_CHAN_RADAR) {
 192                                 channels[j].flags |= SCAN_CHANNEL_FLAGS_DFS;
 193
 194                                 channels[j].passive_duration =
 195                                         cpu_to_le16(dwell_time_dfs);
 196                         } else {
 197                                 channels[j].passive_duration =
 198                                         cpu_to_le16(dwell_time_passive);
 199                         }
 200
 201                         channels[j].min_duration =
 202                                 cpu_to_le16(min_dwell_time_active);
 203                         channels[j].max_duration =
 204                                 cpu_to_le16(max_dwell_time_active);
 205
 206                         channels[j].tx_power_att = req_channels[i]->max_power;
 207                         channels[j].channel = req_channels[i]->hw_value;
 208
 209                         if (n_pactive_ch &&
 210                             (band == NL80211_BAND_2GHZ) &&
 211                             (channels[j].channel >= 12) &&
 212                             (channels[j].channel <= 14) &&
 213                             (flags & IEEE80211_CHAN_NO_IR) &&
 214                             !force_passive) {
 215                                 /* pactive channels treated as DFS */
 216                                 channels[j].flags = SCAN_CHANNEL_FLAGS_DFS;
 217
 218                                 /*
 219                                  * n_pactive_ch is counted down from the end of
 220                                  * the passive channel list
 221                                  */
 222                                 (*n_pactive_ch)++;
 223                                 wl1271_debug(DEBUG_SCAN, "n_pactive_ch = %d",
 224                                              *n_pactive_ch);
 225                         }
 226
 227                         wl1271_debug(DEBUG_SCAN, "freq %d, ch. %d, flags 0x%x, power %d, min/max_dwell %d/%d%s%s",
 228                                      req_channels[i]->center_freq,
 229                                      req_channels[i]->hw_value,
 230                                      req_channels[i]->flags,
 231                                      req_channels[i]->max_power,
 232                                      min_dwell_time_active,
 233                                      max_dwell_time_active,
 234                                      flags & IEEE80211_CHAN_RADAR ?
 235                                         ", DFS" : "",
 236                                      flags & IEEE80211_CHAN_NO_IR ?
 237                                         ", NO-IR" : "");
 238                         j++;
 239                 }
 240         }
 241
 242         return j - start;
 243 }
 244
 245 bool
 246 wlcore_set_scan_chan_params(struct wl1271 *wl,
 247                             struct wlcore_scan_channels *cfg,
 248                             struct ieee80211_channel *channels[],
 249                             u32 n_channels,
 250                             u32 n_ssids,
 251                             int scan_type)
 252 {
 253         u8 n_pactive_ch = 0;
 254
 255         cfg->passive[0] =
 256                 wlcore_scan_get_channels(wl,
 257                                          channels,
 258                                          n_channels,
 259                                          n_ssids,
 260                                          cfg->channels_2,
 261                                          NL80211_BAND_2GHZ,
 262                                          false, true, 0,
 263                                          MAX_CHANNELS_2GHZ,
 264                                          &n_pactive_ch,
 265                                          scan_type);
 266         cfg->active[0] =
 267                 wlcore_scan_get_channels(wl,
 268                                          channels,
 269                                          n_channels,
 270                                          n_ssids,
 271                                          cfg->channels_2,
 272                                          NL80211_BAND_2GHZ,
 273                                          false, false,
 274                                          cfg->passive[0],
 275                                          MAX_CHANNELS_2GHZ,
 276                                          &n_pactive_ch,
 277                                          scan_type);
 278         cfg->passive[1] =
 279                 wlcore_scan_get_channels(wl,
 280                                          channels,
 281                                          n_channels,
 282                                          n_ssids,
 283                                          cfg->channels_5,
 284                                          NL80211_BAND_5GHZ,
 285                                          false, true, 0,
 286                                          wl->max_channels_5,
 287                                          &n_pactive_ch,
 288                                          scan_type);
 289         cfg->dfs =
 290                 wlcore_scan_get_channels(wl,
 291                                          channels,
 292                                          n_channels,
 293                                          n_ssids,
 294                                          cfg->channels_5,
 295                                          NL80211_BAND_5GHZ,
 296                                          true, true,
 297                                          cfg->passive[1],
 298                                          wl->max_channels_5,
 299                                          &n_pactive_ch,
 300                                          scan_type);
 301         cfg->active[1] =
 302                 wlcore_scan_get_channels(wl,
 303                                          channels,
 304                                          n_channels,
 305                                          n_ssids,
 306                                          cfg->channels_5,
 307                                          NL80211_BAND_5GHZ,
 308                                          false, false,
 309                                          cfg->passive[1] + cfg->dfs,
 310                                          wl->max_channels_5,
 311                                          &n_pactive_ch,
 312                                          scan_type);
 313
 314         /* 802.11j channels are not supported yet */
 315         cfg->passive[2] = 0;
 316         cfg->active[2] = 0;
 317
 318         cfg->passive_active = n_pactive_ch;
 319
 320         wl1271_debug(DEBUG_SCAN, "    2.4GHz: active %d passive %d",
 321                      cfg->active[0], cfg->passive[0]);
 322         wl1271_debug(DEBUG_SCAN, "    5GHz: active %d passive %d",
 323                      cfg->active[1], cfg->passive[1]);
 324         wl1271_debug(DEBUG_SCAN, "    DFS: %d", cfg->dfs);
 325
 326         return  cfg->passive[0] || cfg->active[0] ||
 327                 cfg->passive[1] || cfg->active[1] || cfg->dfs ||
 328                 cfg->passive[2] || cfg->active[2];
 329 }
 330 EXPORT_SYMBOL_GPL(wlcore_set_scan_chan_params);
 331
 332 int wlcore_scan(struct wl1271 *wl, struct ieee80211_vif *vif,
 333                 const u8 *ssid, size_t ssid_len,
 334                 struct cfg80211_scan_request *req)
 335 {
 336         struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
 337
 338         /*
 339          * cfg80211 should guarantee that we don't get more channels
 340          * than what we have registered.
 341          */
 342         BUG_ON(req->n_channels > WL1271_MAX_CHANNELS);
 343
 344         if (wl->scan.state != WL1271_SCAN_STATE_IDLE)
 345                 return -EBUSY;
 346
 347         wl->scan.state = WL1271_SCAN_STATE_2GHZ_ACTIVE;
 348
 349         if (ssid_len && ssid) {
 350                 wl->scan.ssid_len = ssid_len;
 351                 memcpy(wl->scan.ssid, ssid, ssid_len);
 352         } else {
 353                 wl->scan.ssid_len = 0;
 354         }
 355
 356         wl->scan_wlvif = wlvif;
 357         wl->scan.req = req;
 358         memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));
 359
 360         /* we assume failure so that timeout scenarios are handled correctly */
 361         wl->scan.failed = true;
 362         ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
 363                                      msecs_to_jiffies(WL1271_SCAN_TIMEOUT));
 364
 365         wl->ops->scan_start(wl, wlvif, req);
 366
 367         return 0;
 368 }
 369 /* Returns the scan type to be used or a negative value on error */
 370 int
 371 wlcore_scan_sched_scan_ssid_list(struct wl1271 *wl,
 372                                  struct wl12xx_vif *wlvif,
 373                                  struct cfg80211_sched_scan_request *req)
 374 {
 375         struct wl1271_cmd_sched_scan_ssid_list *cmd = NULL;
 376         struct cfg80211_match_set *sets = req->match_sets;
 377         struct cfg80211_ssid *ssids = req->ssids;
 378         int ret = 0, type, i, j, n_match_ssids = 0;
 379
 380         wl1271_debug((DEBUG_CMD | DEBUG_SCAN), "cmd sched scan ssid list");
 381
 382         /* count the match sets that contain SSIDs */
 383         for (i = 0; i < req->n_match_sets; i++)
 384                 if (sets[i].ssid.ssid_len > 0)
 385                         n_match_ssids++;
 386
 387         /* No filter, no ssids or only bcast ssid */
 388         if (!n_match_ssids &&
 389             (!req->n_ssids ||
 390              (req->n_ssids == 1 && req->ssids[0].ssid_len == 0))) {
 391                 type = SCAN_SSID_FILTER_ANY;
 392                 goto out;
 393         }
 394
 395         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 396         if (!cmd) {
 397                 ret = -ENOMEM;
 398                 goto out;
 399         }
 400
 401         cmd->role_id = wlvif->role_id;
 402         if (!n_match_ssids) {
 403                 /* No filter, with ssids */
 404                 type = SCAN_SSID_FILTER_DISABLED;
 405
 406                 for (i = 0; i < req->n_ssids; i++) {
 407                         cmd->ssids[cmd->n_ssids].type = (ssids[i].ssid_len) ?
 408                                 SCAN_SSID_TYPE_HIDDEN : SCAN_SSID_TYPE_PUBLIC;
 409                         cmd->ssids[cmd->n_ssids].len = ssids[i].ssid_len;
 410                         memcpy(cmd->ssids[cmd->n_ssids].ssid, ssids[i].ssid,
 411                                ssids[i].ssid_len);
 412                         cmd->n_ssids++;
 413                 }
 414         } else {
 415                 type = SCAN_SSID_FILTER_LIST;
 416
 417                 /* Add all SSIDs from the filters */
 418                 for (i = 0; i < req->n_match_sets; i++) {
 419                         /* ignore sets without SSIDs */
 420                         if (!sets[i].ssid.ssid_len)
 421                                 continue;
 422
 423                         cmd->ssids[cmd->n_ssids].type = SCAN_SSID_TYPE_PUBLIC;
 424                         cmd->ssids[cmd->n_ssids].len = sets[i].ssid.ssid_len;
 425                         memcpy(cmd->ssids[cmd->n_ssids].ssid,
 426                                sets[i].ssid.ssid, sets[i].ssid.ssid_len);
 427                         cmd->n_ssids++;
 428                 }
 429                 if ((req->n_ssids > 1) ||
 430                     (req->n_ssids == 1 && req->ssids[0].ssid_len > 0)) {
 431                         /*
 432                          * Mark all the SSIDs passed in the SSID list as HIDDEN,
 433                          * so they're used in probe requests.
 434                          */
 435                         for (i = 0; i < req->n_ssids; i++) {
 436                                 if (!req->ssids[i].ssid_len)
 437                                         continue;
 438
 439                                 for (j = 0; j < cmd->n_ssids; j++)
 440                                         if ((req->ssids[i].ssid_len ==
 441                                              cmd->ssids[j].len) &&
 442                                             !memcmp(req->ssids[i].ssid,
 443                                                    cmd->ssids[j].ssid,
 444                                                    req->ssids[i].ssid_len)) {
 445                                                 cmd->ssids[j].type =
 446                                                         SCAN_SSID_TYPE_HIDDEN;
 447                                                 break;
 448                                         }
 449                                 /* Fail if SSID isn't present in the filters */
 450                                 if (j == cmd->n_ssids) {
 451                                         ret = -EINVAL;
 452                                         goto out_free;
 453                                 }
 454                         }
 455                 }
 456         }
 457
 458         ret = wl1271_cmd_send(wl, CMD_CONNECTION_SCAN_SSID_CFG, cmd,
 459                               sizeof(*cmd), 0);
 460         if (ret < 0) {
 461                 wl1271_error("cmd sched scan ssid list failed");
 462                 goto out_free;
 463         }
 464
 465 out_free:
 466         kfree(cmd);
 467 out:
 468         if (ret < 0)
 469                 return ret;
 470         return type;
 471 }
 472 EXPORT_SYMBOL_GPL(wlcore_scan_sched_scan_ssid_list);
 473
 474 void wlcore_scan_sched_scan_results(struct wl1271 *wl)
 475 {
 476         wl1271_debug(DEBUG_SCAN, "got periodic scan results");
 477
 478         ieee80211_sched_scan_results(wl->hw);
 479 }
 480 EXPORT_SYMBOL_GPL(wlcore_scan_sched_scan_results);