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Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[cris-mirror.git] / drivers / net / wireless / ti / wlcore / scan.c
blob5612f5916b4efac96def81dadc7f3408b7133d70
1 /*
2 * This file is part of wl1271
3 *
4 * Copyright (C) 2009-2010 Nokia Corporation
5 *
6 * Contact: Luciano Coelho <luciano.coelho@nokia.com>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * version 2 as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA
21 *
22 */
23
24 #include <linux/ieee80211.h>
25
26 #include "wlcore.h"
27 #include "debug.h"
28 #include "cmd.h"
29 #include "scan.h"
30 #include "acx.h"
31 #include "ps.h"
32 #include "tx.h"
33
34 void wl1271_scan_complete_work(struct work_struct *work)
35 {
36 struct delayed_work *dwork;
37 struct wl1271 *wl;
38 struct wl12xx_vif *wlvif;
39 struct cfg80211_scan_info info = {
40 .aborted = false,
41 };
42 int ret;
43
44 dwork = to_delayed_work(work);
45 wl = container_of(dwork, struct wl1271, scan_complete_work);
46
47 wl1271_debug(DEBUG_SCAN, "Scanning complete");
48
49 mutex_lock(&wl->mutex);
50
51 if (unlikely(wl->state != WLCORE_STATE_ON))
52 goto out;
53
54 if (wl->scan.state == WL1271_SCAN_STATE_IDLE)
55 goto out;
56
57 wlvif = wl->scan_wlvif;
58
59 /*
60 * Rearm the tx watchdog just before idling scan. This
61 * prevents just-finished scans from triggering the watchdog
62 */
63 wl12xx_rearm_tx_watchdog_locked(wl);
64
65 wl->scan.state = WL1271_SCAN_STATE_IDLE;
66 memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));
67 wl->scan.req = NULL;
68 wl->scan_wlvif = NULL;
69
70 ret = wl1271_ps_elp_wakeup(wl);
71 if (ret < 0)
72 goto out;
73
74 if (test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags)) {
75 /* restore hardware connection monitoring template */
76 wl1271_cmd_build_ap_probe_req(wl, wlvif, wlvif->probereq);
77 }
78
79 wl1271_ps_elp_sleep(wl);
80
81 if (wl->scan.failed) {
82 wl1271_info("Scan completed due to error.");
83 wl12xx_queue_recovery_work(wl);
84 }
85
86 wlcore_cmd_regdomain_config_locked(wl);
87
88 ieee80211_scan_completed(wl->hw, &info);
89
90 out:
91 mutex_unlock(&wl->mutex);
92
93 }
94
95 static void wlcore_started_vifs_iter(void *data, u8 *mac,
96 struct ieee80211_vif *vif)
97 {
98 struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
99 bool active = false;
100 int *count = (int *)data;
101
102 /*
103 * count active interfaces according to interface type.
104 * checking only bss_conf.idle is bad for some cases, e.g.
105 * we don't want to count sta in p2p_find as active interface.
106 */
107 switch (wlvif->bss_type) {
108 case BSS_TYPE_STA_BSS:
109 if (test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags))
110 active = true;
111 break;
112
113 case BSS_TYPE_AP_BSS:
114 if (wlvif->wl->active_sta_count > 0)
115 active = true;
116 break;
117
118 default:
119 break;
120 }
121
122 if (active)
123 (*count)++;
124 }
125
126 static int wlcore_count_started_vifs(struct wl1271 *wl)
127 {
128 int count = 0;
129
130 ieee80211_iterate_active_interfaces_atomic(wl->hw,
131 IEEE80211_IFACE_ITER_RESUME_ALL,
132 wlcore_started_vifs_iter, &count);
133 return count;
134 }
135
136 static int
137 wlcore_scan_get_channels(struct wl1271 *wl,
138 struct ieee80211_channel *req_channels[],
139 u32 n_channels,
140 u32 n_ssids,
141 struct conn_scan_ch_params *channels,
142 u32 band, bool radar, bool passive,
143 int start, int max_channels,
144 u8 *n_pactive_ch,
145 int scan_type)
146 {
147 int i, j;
148 u32 flags;
149 bool force_passive = !n_ssids;
150 u32 min_dwell_time_active, max_dwell_time_active;
151 u32 dwell_time_passive, dwell_time_dfs;
152
153 /* configure dwell times according to scan type */
154 if (scan_type == SCAN_TYPE_SEARCH) {
155 struct conf_scan_settings *c = &wl->conf.scan;
156 bool active_vif_exists = !!wlcore_count_started_vifs(wl);
157
158 min_dwell_time_active = active_vif_exists ?
159 c->min_dwell_time_active :
160 c->min_dwell_time_active_long;
161 max_dwell_time_active = active_vif_exists ?
162 c->max_dwell_time_active :
163 c->max_dwell_time_active_long;
164 dwell_time_passive = c->dwell_time_passive;
165 dwell_time_dfs = c->dwell_time_dfs;
166 } else {
167 struct conf_sched_scan_settings *c = &wl->conf.sched_scan;
168 u32 delta_per_probe;
169
170 if (band == NL80211_BAND_5GHZ)
171 delta_per_probe = c->dwell_time_delta_per_probe_5;
172 else
173 delta_per_probe = c->dwell_time_delta_per_probe;
174
175 min_dwell_time_active = c->base_dwell_time +
176 n_ssids * c->num_probe_reqs * delta_per_probe;
177
178 max_dwell_time_active = min_dwell_time_active +
179 c->max_dwell_time_delta;
180 dwell_time_passive = c->dwell_time_passive;
181 dwell_time_dfs = c->dwell_time_dfs;
182 }
183 min_dwell_time_active = DIV_ROUND_UP(min_dwell_time_active, 1000);
184 max_dwell_time_active = DIV_ROUND_UP(max_dwell_time_active, 1000);
185 dwell_time_passive = DIV_ROUND_UP(dwell_time_passive, 1000);
186 dwell_time_dfs = DIV_ROUND_UP(dwell_time_dfs, 1000);
187
188 for (i = 0, j = start;
189 i < n_channels && j < max_channels;
190 i++) {
191 flags = req_channels[i]->flags;
192
193 if (force_passive)
194 flags |= IEEE80211_CHAN_NO_IR;
195
196 if ((req_channels[i]->band == band) &&
197 !(flags & IEEE80211_CHAN_DISABLED) &&
198 (!!(flags & IEEE80211_CHAN_RADAR) == radar) &&
199 /* if radar is set, we ignore the passive flag */
200 (radar ||
201 !!(flags & IEEE80211_CHAN_NO_IR) == passive)) {
202 if (flags & IEEE80211_CHAN_RADAR) {
203 channels[j].flags |= SCAN_CHANNEL_FLAGS_DFS;
204
205 channels[j].passive_duration =
206 cpu_to_le16(dwell_time_dfs);
207 } else {
208 channels[j].passive_duration =
209 cpu_to_le16(dwell_time_passive);
210 }
211
212 channels[j].min_duration =
213 cpu_to_le16(min_dwell_time_active);
214 channels[j].max_duration =
215 cpu_to_le16(max_dwell_time_active);
216
217 channels[j].tx_power_att = req_channels[i]->max_power;
218 channels[j].channel = req_channels[i]->hw_value;
219
220 if (n_pactive_ch &&
221 (band == NL80211_BAND_2GHZ) &&
222 (channels[j].channel >= 12) &&
223 (channels[j].channel <= 14) &&
224 (flags & IEEE80211_CHAN_NO_IR) &&
225 !force_passive) {
226 /* pactive channels treated as DFS */
227 channels[j].flags = SCAN_CHANNEL_FLAGS_DFS;
228
229 /*
230 * n_pactive_ch is counted down from the end of
231 * the passive channel list
232 */
233 (*n_pactive_ch)++;
234 wl1271_debug(DEBUG_SCAN, "n_pactive_ch = %d",
235 *n_pactive_ch);
236 }
237
238 wl1271_debug(DEBUG_SCAN, "freq %d, ch. %d, flags 0x%x, power %d, min/max_dwell %d/%d%s%s",
239 req_channels[i]->center_freq,
240 req_channels[i]->hw_value,
241 req_channels[i]->flags,
242 req_channels[i]->max_power,
243 min_dwell_time_active,
244 max_dwell_time_active,
245 flags & IEEE80211_CHAN_RADAR ?
246 ", DFS" : "",
247 flags & IEEE80211_CHAN_NO_IR ?
248 ", NO-IR" : "");
249 j++;
250 }
251 }
252
253 return j - start;
254 }
255
256 bool
257 wlcore_set_scan_chan_params(struct wl1271 *wl,
258 struct wlcore_scan_channels *cfg,
259 struct ieee80211_channel *channels[],
260 u32 n_channels,
261 u32 n_ssids,
262 int scan_type)
263 {
264 u8 n_pactive_ch = 0;
265
266 cfg->passive[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, true, 0,
274 MAX_CHANNELS_2GHZ,
275 &n_pactive_ch,
276 scan_type);
277 cfg->active[0] =
278 wlcore_scan_get_channels(wl,
279 channels,
280 n_channels,
281 n_ssids,
282 cfg->channels_2,
283 NL80211_BAND_2GHZ,
284 false, false,
285 cfg->passive[0],
286 MAX_CHANNELS_2GHZ,
287 &n_pactive_ch,
288 scan_type);
289 cfg->passive[1] =
290 wlcore_scan_get_channels(wl,
291 channels,
292 n_channels,
293 n_ssids,
294 cfg->channels_5,
295 NL80211_BAND_5GHZ,
296 false, true, 0,
297 wl->max_channels_5,
298 &n_pactive_ch,
299 scan_type);
300 cfg->dfs =
301 wlcore_scan_get_channels(wl,
302 channels,
303 n_channels,
304 n_ssids,
305 cfg->channels_5,
306 NL80211_BAND_5GHZ,
307 true, true,
308 cfg->passive[1],
309 wl->max_channels_5,
310 &n_pactive_ch,
311 scan_type);
312 cfg->active[1] =
313 wlcore_scan_get_channels(wl,
314 channels,
315 n_channels,
316 n_ssids,
317 cfg->channels_5,
318 NL80211_BAND_5GHZ,
319 false, false,
320 cfg->passive[1] + cfg->dfs,
321 wl->max_channels_5,
322 &n_pactive_ch,
323 scan_type);
324
325 /* 802.11j channels are not supported yet */
326 cfg->passive[2] = 0;
327 cfg->active[2] = 0;
328
329 cfg->passive_active = n_pactive_ch;
330
331 wl1271_debug(DEBUG_SCAN, " 2.4GHz: active %d passive %d",
332 cfg->active[0], cfg->passive[0]);
333 wl1271_debug(DEBUG_SCAN, " 5GHz: active %d passive %d",
334 cfg->active[1], cfg->passive[1]);
335 wl1271_debug(DEBUG_SCAN, " DFS: %d", cfg->dfs);
336
337 return cfg->passive[0] || cfg->active[0] ||
338 cfg->passive[1] || cfg->active[1] || cfg->dfs ||
339 cfg->passive[2] || cfg->active[2];
340 }
341 EXPORT_SYMBOL_GPL(wlcore_set_scan_chan_params);
342
343 int wlcore_scan(struct wl1271 *wl, struct ieee80211_vif *vif,
344 const u8 *ssid, size_t ssid_len,
345 struct cfg80211_scan_request *req)
346 {
347 struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
348
349 /*
350 * cfg80211 should guarantee that we don't get more channels
351 * than what we have registered.
352 */
353 BUG_ON(req->n_channels > WL1271_MAX_CHANNELS);
354
355 if (wl->scan.state != WL1271_SCAN_STATE_IDLE)
356 return -EBUSY;
357
358 wl->scan.state = WL1271_SCAN_STATE_2GHZ_ACTIVE;
359
360 if (ssid_len && ssid) {
361 wl->scan.ssid_len = ssid_len;
362 memcpy(wl->scan.ssid, ssid, ssid_len);
363 } else {
364 wl->scan.ssid_len = 0;
365 }
366
367 wl->scan_wlvif = wlvif;
368 wl->scan.req = req;
369 memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));
370
371 /* we assume failure so that timeout scenarios are handled correctly */
372 wl->scan.failed = true;
373 ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
374 msecs_to_jiffies(WL1271_SCAN_TIMEOUT));
375
376 wl->ops->scan_start(wl, wlvif, req);
377
378 return 0;
379 }
380 /* Returns the scan type to be used or a negative value on error */
381 int
382 wlcore_scan_sched_scan_ssid_list(struct wl1271 *wl,
383 struct wl12xx_vif *wlvif,
384 struct cfg80211_sched_scan_request *req)
385 {
386 struct wl1271_cmd_sched_scan_ssid_list *cmd = NULL;
387 struct cfg80211_match_set *sets = req->match_sets;
388 struct cfg80211_ssid *ssids = req->ssids;
389 int ret = 0, type, i, j, n_match_ssids = 0;
390
391 wl1271_debug((DEBUG_CMD | DEBUG_SCAN), "cmd sched scan ssid list");
392
393 /* count the match sets that contain SSIDs */
394 for (i = 0; i < req->n_match_sets; i++)
395 if (sets[i].ssid.ssid_len > 0)
396 n_match_ssids++;
397
398 /* No filter, no ssids or only bcast ssid */
399 if (!n_match_ssids &&
400 (!req->n_ssids ||
401 (req->n_ssids == 1 && req->ssids[0].ssid_len == 0))) {
402 type = SCAN_SSID_FILTER_ANY;
403 goto out;
404 }
405
406 cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
407 if (!cmd) {
408 ret = -ENOMEM;
409 goto out;
410 }
411
412 cmd->role_id = wlvif->role_id;
413 if (!n_match_ssids) {
414 /* No filter, with ssids */
415 type = SCAN_SSID_FILTER_DISABLED;
416
417 for (i = 0; i < req->n_ssids; i++) {
418 cmd->ssids[cmd->n_ssids].type = (ssids[i].ssid_len) ?
419 SCAN_SSID_TYPE_HIDDEN : SCAN_SSID_TYPE_PUBLIC;
420 cmd->ssids[cmd->n_ssids].len = ssids[i].ssid_len;
421 memcpy(cmd->ssids[cmd->n_ssids].ssid, ssids[i].ssid,
422 ssids[i].ssid_len);
423 cmd->n_ssids++;
424 }
425 } else {
426 type = SCAN_SSID_FILTER_LIST;
427
428 /* Add all SSIDs from the filters */
429 for (i = 0; i < req->n_match_sets; i++) {
430 /* ignore sets without SSIDs */
431 if (!sets[i].ssid.ssid_len)
432 continue;
433
434 cmd->ssids[cmd->n_ssids].type = SCAN_SSID_TYPE_PUBLIC;
435 cmd->ssids[cmd->n_ssids].len = sets[i].ssid.ssid_len;
436 memcpy(cmd->ssids[cmd->n_ssids].ssid,
437 sets[i].ssid.ssid, sets[i].ssid.ssid_len);
438 cmd->n_ssids++;
439 }
440 if ((req->n_ssids > 1) ||
441 (req->n_ssids == 1 && req->ssids[0].ssid_len > 0)) {
442 /*
443 * Mark all the SSIDs passed in the SSID list as HIDDEN,
444 * so they're used in probe requests.
445 */
446 for (i = 0; i < req->n_ssids; i++) {
447 if (!req->ssids[i].ssid_len)
448 continue;
449
450 for (j = 0; j < cmd->n_ssids; j++)
451 if ((req->ssids[i].ssid_len ==
452 cmd->ssids[j].len) &&
453 !memcmp(req->ssids[i].ssid,
454 cmd->ssids[j].ssid,
455 req->ssids[i].ssid_len)) {
456 cmd->ssids[j].type =
457 SCAN_SSID_TYPE_HIDDEN;
458 break;
459 }
460 /* Fail if SSID isn't present in the filters */
461 if (j == cmd->n_ssids) {
462 ret = -EINVAL;
463 goto out_free;
464 }
465 }
466 }
467 }
468
469 ret = wl1271_cmd_send(wl, CMD_CONNECTION_SCAN_SSID_CFG, cmd,
470 sizeof(*cmd), 0);
471 if (ret < 0) {
472 wl1271_error("cmd sched scan ssid list failed");
473 goto out_free;
474 }
475
476 out_free:
477 kfree(cmd);
478 out:
479 if (ret < 0)
480 return ret;
481 return type;
482 }
483 EXPORT_SYMBOL_GPL(wlcore_scan_sched_scan_ssid_list);
484
485 void wlcore_scan_sched_scan_results(struct wl1271 *wl)
486 {
487 wl1271_debug(DEBUG_SCAN, "got periodic scan results");
488
489 ieee80211_sched_scan_results(wl->hw);
490 }
491 EXPORT_SYMBOL_GPL(wlcore_scan_sched_scan_results);
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