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Revert "iwlwifi: Send broadcast probe request only when asked to"
[deliverable/linux.git] / drivers / net / wireless / iwlwifi / iwl-scan.c
1 /******************************************************************************
2 *
3 * GPL LICENSE SUMMARY
4 *
5 * Copyright(c) 2008 - 2010 Intel Corporation. All rights reserved.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of version 2 of the GNU General Public License as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
19 * USA
20 *
21 * The full GNU General Public License is included in this distribution
22 * in the file called LICENSE.GPL.
23 *
24 * Contact Information:
25 * Intel Linux Wireless <ilw@linux.intel.com>
26 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
27 *****************************************************************************/
28 #include <linux/types.h>
29 #include <linux/etherdevice.h>
30 #include <net/mac80211.h>
31
32 #include "iwl-eeprom.h"
33 #include "iwl-dev.h"
34 #include "iwl-core.h"
35 #include "iwl-sta.h"
36 #include "iwl-io.h"
37 #include "iwl-helpers.h"
38
39 /* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
40 * sending probe req. This should be set long enough to hear probe responses
41 * from more than one AP. */
42 #define IWL_ACTIVE_DWELL_TIME_24 (30) /* all times in msec */
43 #define IWL_ACTIVE_DWELL_TIME_52 (20)
44
45 #define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3)
46 #define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2)
47
48 /* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
49 * Must be set longer than active dwell time.
50 * For the most reliable scan, set > AP beacon interval (typically 100msec). */
51 #define IWL_PASSIVE_DWELL_TIME_24 (20) /* all times in msec */
52 #define IWL_PASSIVE_DWELL_TIME_52 (10)
53 #define IWL_PASSIVE_DWELL_BASE (100)
54 #define IWL_CHANNEL_TUNE_TIME 5
55
56
57
58 /**
59 * iwl_scan_cancel - Cancel any currently executing HW scan
60 *
61 * NOTE: priv->mutex is not required before calling this function
62 */
63 int iwl_scan_cancel(struct iwl_priv *priv)
64 {
65 if (!test_bit(STATUS_SCAN_HW, &priv->status)) {
66 clear_bit(STATUS_SCANNING, &priv->status);
67 return 0;
68 }
69
70 if (test_bit(STATUS_SCANNING, &priv->status)) {
71 if (!test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
72 IWL_DEBUG_SCAN(priv, "Queuing scan abort.\n");
73 set_bit(STATUS_SCAN_ABORTING, &priv->status);
74 queue_work(priv->workqueue, &priv->abort_scan);
75
76 } else
77 IWL_DEBUG_SCAN(priv, "Scan abort already in progress.\n");
78
79 return test_bit(STATUS_SCANNING, &priv->status);
80 }
81
82 return 0;
83 }
84 EXPORT_SYMBOL(iwl_scan_cancel);
85 /**
86 * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
87 * @ms: amount of time to wait (in milliseconds) for scan to abort
88 *
89 * NOTE: priv->mutex must be held before calling this function
90 */
91 int iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
92 {
93 unsigned long now = jiffies;
94 int ret;
95
96 ret = iwl_scan_cancel(priv);
97 if (ret && ms) {
98 mutex_unlock(&priv->mutex);
99 while (!time_after(jiffies, now + msecs_to_jiffies(ms)) &&
100 test_bit(STATUS_SCANNING, &priv->status))
101 msleep(1);
102 mutex_lock(&priv->mutex);
103
104 return test_bit(STATUS_SCANNING, &priv->status);
105 }
106
107 return ret;
108 }
109 EXPORT_SYMBOL(iwl_scan_cancel_timeout);
110
111 static int iwl_send_scan_abort(struct iwl_priv *priv)
112 {
113 int ret = 0;
114 struct iwl_rx_packet *pkt;
115 struct iwl_host_cmd cmd = {
116 .id = REPLY_SCAN_ABORT_CMD,
117 .flags = CMD_WANT_SKB,
118 };
119
120 /* If there isn't a scan actively going on in the hardware
121 * then we are in between scan bands and not actually
122 * actively scanning, so don't send the abort command */
123 if (!test_bit(STATUS_SCAN_HW, &priv->status)) {
124 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
125 return 0;
126 }
127
128 ret = iwl_send_cmd_sync(priv, &cmd);
129 if (ret) {
130 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
131 return ret;
132 }
133
134 pkt = (struct iwl_rx_packet *)cmd.reply_page;
135 if (pkt->u.status != CAN_ABORT_STATUS) {
136 /* The scan abort will return 1 for success or
137 * 2 for "failure". A failure condition can be
138 * due to simply not being in an active scan which
139 * can occur if we send the scan abort before we
140 * the microcode has notified us that a scan is
141 * completed. */
142 IWL_DEBUG_INFO(priv, "SCAN_ABORT returned %d.\n", pkt->u.status);
143 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
144 clear_bit(STATUS_SCAN_HW, &priv->status);
145 }
146
147 iwl_free_pages(priv, cmd.reply_page);
148
149 return ret;
150 }
151
152 /* Service response to REPLY_SCAN_CMD (0x80) */
153 static void iwl_rx_reply_scan(struct iwl_priv *priv,
154 struct iwl_rx_mem_buffer *rxb)
155 {
156 #ifdef CONFIG_IWLWIFI_DEBUG
157 struct iwl_rx_packet *pkt = rxb_addr(rxb);
158 struct iwl_scanreq_notification *notif =
159 (struct iwl_scanreq_notification *)pkt->u.raw;
160
161 IWL_DEBUG_RX(priv, "Scan request status = 0x%x\n", notif->status);
162 #endif
163 }
164
165 /* Service SCAN_START_NOTIFICATION (0x82) */
166 static void iwl_rx_scan_start_notif(struct iwl_priv *priv,
167 struct iwl_rx_mem_buffer *rxb)
168 {
169 struct iwl_rx_packet *pkt = rxb_addr(rxb);
170 struct iwl_scanstart_notification *notif =
171 (struct iwl_scanstart_notification *)pkt->u.raw;
172 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
173 IWL_DEBUG_SCAN(priv, "Scan start: "
174 "%d [802.11%s] "
175 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
176 notif->channel,
177 notif->band ? "bg" : "a",
178 le32_to_cpu(notif->tsf_high),
179 le32_to_cpu(notif->tsf_low),
180 notif->status, notif->beacon_timer);
181 }
182
183 /* Service SCAN_RESULTS_NOTIFICATION (0x83) */
184 static void iwl_rx_scan_results_notif(struct iwl_priv *priv,
185 struct iwl_rx_mem_buffer *rxb)
186 {
187 #ifdef CONFIG_IWLWIFI_DEBUG
188 struct iwl_rx_packet *pkt = rxb_addr(rxb);
189 struct iwl_scanresults_notification *notif =
190 (struct iwl_scanresults_notification *)pkt->u.raw;
191
192 IWL_DEBUG_SCAN(priv, "Scan ch.res: "
193 "%d [802.11%s] "
194 "(TSF: 0x%08X:%08X) - %d "
195 "elapsed=%lu usec\n",
196 notif->channel,
197 notif->band ? "bg" : "a",
198 le32_to_cpu(notif->tsf_high),
199 le32_to_cpu(notif->tsf_low),
200 le32_to_cpu(notif->statistics[0]),
201 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf);
202 #endif
203
204 if (!priv->is_internal_short_scan)
205 priv->next_scan_jiffies = 0;
206 }
207
208 /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
209 static void iwl_rx_scan_complete_notif(struct iwl_priv *priv,
210 struct iwl_rx_mem_buffer *rxb)
211 {
212 #ifdef CONFIG_IWLWIFI_DEBUG
213 struct iwl_rx_packet *pkt = rxb_addr(rxb);
214 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
215
216 IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
217 scan_notif->scanned_channels,
218 scan_notif->tsf_low,
219 scan_notif->tsf_high, scan_notif->status);
220 #endif
221
222 /* The HW is no longer scanning */
223 clear_bit(STATUS_SCAN_HW, &priv->status);
224
225 IWL_DEBUG_INFO(priv, "Scan pass on %sGHz took %dms\n",
226 (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) ?
227 "2.4" : "5.2",
228 jiffies_to_msecs(elapsed_jiffies
229 (priv->scan_pass_start, jiffies)));
230
231 /* Remove this scanned band from the list of pending
232 * bands to scan, band G precedes A in order of scanning
233 * as seen in iwl_bg_request_scan */
234 if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ))
235 priv->scan_bands &= ~BIT(IEEE80211_BAND_2GHZ);
236 else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ))
237 priv->scan_bands &= ~BIT(IEEE80211_BAND_5GHZ);
238
239 /* If a request to abort was given, or the scan did not succeed
240 * then we reset the scan state machine and terminate,
241 * re-queuing another scan if one has been requested */
242 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
243 IWL_DEBUG_INFO(priv, "Aborted scan completed.\n");
244 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
245 } else {
246 /* If there are more bands on this scan pass reschedule */
247 if (priv->scan_bands)
248 goto reschedule;
249 }
250
251 if (!priv->is_internal_short_scan)
252 priv->next_scan_jiffies = 0;
253
254 IWL_DEBUG_INFO(priv, "Setting scan to off\n");
255
256 clear_bit(STATUS_SCANNING, &priv->status);
257
258 IWL_DEBUG_INFO(priv, "Scan took %dms\n",
259 jiffies_to_msecs(elapsed_jiffies(priv->scan_start, jiffies)));
260
261 queue_work(priv->workqueue, &priv->scan_completed);
262
263 return;
264
265 reschedule:
266 priv->scan_pass_start = jiffies;
267 queue_work(priv->workqueue, &priv->request_scan);
268 }
269
270 void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
271 {
272 /* scan handlers */
273 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
274 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
275 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
276 iwl_rx_scan_results_notif;
277 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
278 iwl_rx_scan_complete_notif;
279 }
280 EXPORT_SYMBOL(iwl_setup_rx_scan_handlers);
281
282 inline u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
283 enum ieee80211_band band,
284 u8 n_probes)
285 {
286 if (band == IEEE80211_BAND_5GHZ)
287 return IWL_ACTIVE_DWELL_TIME_52 +
288 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
289 else
290 return IWL_ACTIVE_DWELL_TIME_24 +
291 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
292 }
293 EXPORT_SYMBOL(iwl_get_active_dwell_time);
294
295 u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
296 enum ieee80211_band band)
297 {
298 u16 passive = (band == IEEE80211_BAND_2GHZ) ?
299 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
300 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
301
302 if (iwl_is_associated(priv)) {
303 /* If we're associated, we clamp the maximum passive
304 * dwell time to be 98% of the beacon interval (minus
305 * 2 * channel tune time) */
306 passive = priv->beacon_int;
307 if ((passive > IWL_PASSIVE_DWELL_BASE) || !passive)
308 passive = IWL_PASSIVE_DWELL_BASE;
309 passive = (passive * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
310 }
311
312 return passive;
313 }
314 EXPORT_SYMBOL(iwl_get_passive_dwell_time);
315
316 static int iwl_get_single_channel_for_scan(struct iwl_priv *priv,
317 enum ieee80211_band band,
318 struct iwl_scan_channel *scan_ch)
319 {
320 const struct ieee80211_supported_band *sband;
321 const struct iwl_channel_info *ch_info;
322 u16 passive_dwell = 0;
323 u16 active_dwell = 0;
324 int i, added = 0;
325 u16 channel = 0;
326
327 sband = iwl_get_hw_mode(priv, band);
328 if (!sband) {
329 IWL_ERR(priv, "invalid band\n");
330 return added;
331 }
332
333 active_dwell = iwl_get_active_dwell_time(priv, band, 0);
334 passive_dwell = iwl_get_passive_dwell_time(priv, band);
335
336 if (passive_dwell <= active_dwell)
337 passive_dwell = active_dwell + 1;
338
339 /* only scan single channel, good enough to reset the RF */
340 /* pick the first valid not in-use channel */
341 if (band == IEEE80211_BAND_5GHZ) {
342 for (i = 14; i < priv->channel_count; i++) {
343 if (priv->channel_info[i].channel !=
344 le16_to_cpu(priv->staging_rxon.channel)) {
345 channel = priv->channel_info[i].channel;
346 ch_info = iwl_get_channel_info(priv,
347 band, channel);
348 if (is_channel_valid(ch_info))
349 break;
350 }
351 }
352 } else {
353 for (i = 0; i < 14; i++) {
354 if (priv->channel_info[i].channel !=
355 le16_to_cpu(priv->staging_rxon.channel)) {
356 channel =
357 priv->channel_info[i].channel;
358 ch_info = iwl_get_channel_info(priv,
359 band, channel);
360 if (is_channel_valid(ch_info))
361 break;
362 }
363 }
364 }
365 if (channel) {
366 scan_ch->channel = cpu_to_le16(channel);
367 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
368 scan_ch->active_dwell = cpu_to_le16(active_dwell);
369 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
370 /* Set txpower levels to defaults */
371 scan_ch->dsp_atten = 110;
372 if (band == IEEE80211_BAND_5GHZ)
373 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
374 else
375 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
376 added++;
377 } else
378 IWL_ERR(priv, "no valid channel found\n");
379 return added;
380 }
381
382 static int iwl_get_channels_for_scan(struct iwl_priv *priv,
383 enum ieee80211_band band,
384 u8 is_active, u8 n_probes,
385 struct iwl_scan_channel *scan_ch)
386 {
387 struct ieee80211_channel *chan;
388 const struct ieee80211_supported_band *sband;
389 const struct iwl_channel_info *ch_info;
390 u16 passive_dwell = 0;
391 u16 active_dwell = 0;
392 int added, i;
393 u16 channel;
394
395 sband = iwl_get_hw_mode(priv, band);
396 if (!sband)
397 return 0;
398
399 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
400 passive_dwell = iwl_get_passive_dwell_time(priv, band);
401
402 if (passive_dwell <= active_dwell)
403 passive_dwell = active_dwell + 1;
404
405 for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) {
406 chan = priv->scan_request->channels[i];
407
408 if (chan->band != band)
409 continue;
410
411 channel = ieee80211_frequency_to_channel(chan->center_freq);
412 scan_ch->channel = cpu_to_le16(channel);
413
414 ch_info = iwl_get_channel_info(priv, band, channel);
415 if (!is_channel_valid(ch_info)) {
416 IWL_DEBUG_SCAN(priv, "Channel %d is INVALID for this band.\n",
417 channel);
418 continue;
419 }
420
421 if (!is_active || is_channel_passive(ch_info) ||
422 (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN))
423 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
424 else
425 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
426
427 if (n_probes)
428 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
429
430 scan_ch->active_dwell = cpu_to_le16(active_dwell);
431 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
432
433 /* Set txpower levels to defaults */
434 scan_ch->dsp_atten = 110;
435
436 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
437 * power level:
438 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
439 */
440 if (band == IEEE80211_BAND_5GHZ)
441 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
442 else
443 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
444
445 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n",
446 channel, le32_to_cpu(scan_ch->type),
447 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
448 "ACTIVE" : "PASSIVE",
449 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
450 active_dwell : passive_dwell);
451
452 scan_ch++;
453 added++;
454 }
455
456 IWL_DEBUG_SCAN(priv, "total channels to scan %d \n", added);
457 return added;
458 }
459
460 void iwl_init_scan_params(struct iwl_priv *priv)
461 {
462 u8 ant_idx = fls(priv->hw_params.valid_tx_ant) - 1;
463 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
464 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
465 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
466 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
467 }
468 EXPORT_SYMBOL(iwl_init_scan_params);
469
470 static int iwl_scan_initiate(struct iwl_priv *priv)
471 {
472 IWL_DEBUG_INFO(priv, "Starting scan...\n");
473 set_bit(STATUS_SCANNING, &priv->status);
474 priv->is_internal_short_scan = false;
475 priv->scan_start = jiffies;
476 priv->scan_pass_start = priv->scan_start;
477
478 queue_work(priv->workqueue, &priv->request_scan);
479
480 return 0;
481 }
482
483 #define IWL_DELAY_NEXT_SCAN (HZ*2)
484
485 int iwl_mac_hw_scan(struct ieee80211_hw *hw,
486 struct cfg80211_scan_request *req)
487 {
488 unsigned long flags;
489 struct iwl_priv *priv = hw->priv;
490 int ret, i;
491
492 IWL_DEBUG_MAC80211(priv, "enter\n");
493
494 mutex_lock(&priv->mutex);
495 spin_lock_irqsave(&priv->lock, flags);
496
497 if (!iwl_is_ready_rf(priv)) {
498 ret = -EIO;
499 IWL_DEBUG_MAC80211(priv, "leave - not ready or exit pending\n");
500 goto out_unlock;
501 }
502
503 if (test_bit(STATUS_SCANNING, &priv->status)) {
504 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
505 ret = -EAGAIN;
506 goto out_unlock;
507 }
508
509 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
510 IWL_DEBUG_SCAN(priv, "Scan request while abort pending\n");
511 ret = -EAGAIN;
512 goto out_unlock;
513 }
514
515 /* We don't schedule scan within next_scan_jiffies period.
516 * Avoid scanning during possible EAPOL exchange, return
517 * success immediately.
518 */
519 if (priv->next_scan_jiffies &&
520 time_after(priv->next_scan_jiffies, jiffies)) {
521 IWL_DEBUG_SCAN(priv, "scan rejected: within next scan period\n");
522 queue_work(priv->workqueue, &priv->scan_completed);
523 ret = 0;
524 goto out_unlock;
525 }
526
527 priv->scan_bands = 0;
528 for (i = 0; i < req->n_channels; i++)
529 priv->scan_bands |= BIT(req->channels[i]->band);
530
531 priv->scan_request = req;
532
533 ret = iwl_scan_initiate(priv);
534
535 IWL_DEBUG_MAC80211(priv, "leave\n");
536
537 out_unlock:
538 spin_unlock_irqrestore(&priv->lock, flags);
539 mutex_unlock(&priv->mutex);
540
541 return ret;
542 }
543 EXPORT_SYMBOL(iwl_mac_hw_scan);
544
545 /*
546 * internal short scan, this function should only been called while associated.
547 * It will reset and tune the radio to prevent possible RF related problem
548 */
549 int iwl_internal_short_hw_scan(struct iwl_priv *priv)
550 {
551 int ret = 0;
552
553 if (!iwl_is_ready_rf(priv)) {
554 ret = -EIO;
555 IWL_DEBUG_SCAN(priv, "not ready or exit pending\n");
556 goto out;
557 }
558 if (test_bit(STATUS_SCANNING, &priv->status)) {
559 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
560 ret = -EAGAIN;
561 goto out;
562 }
563 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
564 IWL_DEBUG_SCAN(priv, "Scan request while abort pending\n");
565 ret = -EAGAIN;
566 goto out;
567 }
568
569 priv->scan_bands = 0;
570 if (priv->band == IEEE80211_BAND_5GHZ)
571 priv->scan_bands |= BIT(IEEE80211_BAND_5GHZ);
572 else
573 priv->scan_bands |= BIT(IEEE80211_BAND_2GHZ);
574
575 IWL_DEBUG_SCAN(priv, "Start internal short scan...\n");
576 set_bit(STATUS_SCANNING, &priv->status);
577 priv->is_internal_short_scan = true;
578 queue_work(priv->workqueue, &priv->request_scan);
579
580 out:
581 return ret;
582 }
583 EXPORT_SYMBOL(iwl_internal_short_hw_scan);
584
585 #define IWL_SCAN_CHECK_WATCHDOG (7 * HZ)
586
587 void iwl_bg_scan_check(struct work_struct *data)
588 {
589 struct iwl_priv *priv =
590 container_of(data, struct iwl_priv, scan_check.work);
591
592 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
593 return;
594
595 mutex_lock(&priv->mutex);
596 if (test_bit(STATUS_SCANNING, &priv->status) ||
597 test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
598 IWL_DEBUG_SCAN(priv, "Scan completion watchdog resetting "
599 "adapter (%dms)\n",
600 jiffies_to_msecs(IWL_SCAN_CHECK_WATCHDOG));
601
602 if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
603 iwl_send_scan_abort(priv);
604 }
605 mutex_unlock(&priv->mutex);
606 }
607 EXPORT_SYMBOL(iwl_bg_scan_check);
608
609 /**
610 * iwl_fill_probe_req - fill in all required fields and IE for probe request
611 */
612
613 u16 iwl_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame,
614 const u8 *ies, int ie_len, int left)
615 {
616 int len = 0;
617 u8 *pos = NULL;
618
619 /* Make sure there is enough space for the probe request,
620 * two mandatory IEs and the data */
621 left -= 24;
622 if (left < 0)
623 return 0;
624
625 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
626 memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
627 memcpy(frame->sa, priv->mac_addr, ETH_ALEN);
628 memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
629 frame->seq_ctrl = 0;
630
631 len += 24;
632
633 /* ...next IE... */
634 pos = &frame->u.probe_req.variable[0];
635
636 /* fill in our indirect SSID IE */
637 left -= 2;
638 if (left < 0)
639 return 0;
640 *pos++ = WLAN_EID_SSID;
641 *pos++ = 0;
642
643 len += 2;
644
645 if (WARN_ON(left < ie_len))
646 return len;
647
648 if (ies)
649 memcpy(pos, ies, ie_len);
650 len += ie_len;
651 left -= ie_len;
652
653 return (u16)len;
654 }
655 EXPORT_SYMBOL(iwl_fill_probe_req);
656
657 static void iwl_bg_request_scan(struct work_struct *data)
658 {
659 struct iwl_priv *priv =
660 container_of(data, struct iwl_priv, request_scan);
661 struct iwl_host_cmd cmd = {
662 .id = REPLY_SCAN_CMD,
663 .len = sizeof(struct iwl_scan_cmd),
664 .flags = CMD_SIZE_HUGE,
665 };
666 struct iwl_scan_cmd *scan;
667 struct ieee80211_conf *conf = NULL;
668 int ret = 0;
669 u32 rate_flags = 0;
670 u16 cmd_len;
671 u16 rx_chain = 0;
672 enum ieee80211_band band;
673 u8 n_probes = 0;
674 u8 rx_ant = priv->hw_params.valid_rx_ant;
675 u8 rate;
676 bool is_active = false;
677 int chan_mod;
678 u8 active_chains;
679
680 conf = ieee80211_get_hw_conf(priv->hw);
681
682 mutex_lock(&priv->mutex);
683
684 cancel_delayed_work(&priv->scan_check);
685
686 if (!iwl_is_ready(priv)) {
687 IWL_WARN(priv, "request scan called when driver not ready.\n");
688 goto done;
689 }
690
691 /* Make sure the scan wasn't canceled before this queued work
692 * was given the chance to run... */
693 if (!test_bit(STATUS_SCANNING, &priv->status))
694 goto done;
695
696 /* This should never be called or scheduled if there is currently
697 * a scan active in the hardware. */
698 if (test_bit(STATUS_SCAN_HW, &priv->status)) {
699 IWL_DEBUG_INFO(priv, "Multiple concurrent scan requests in parallel. "
700 "Ignoring second request.\n");
701 ret = -EIO;
702 goto done;
703 }
704
705 if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
706 IWL_DEBUG_SCAN(priv, "Aborting scan due to device shutdown\n");
707 goto done;
708 }
709
710 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
711 IWL_DEBUG_HC(priv, "Scan request while abort pending. Queuing.\n");
712 goto done;
713 }
714
715 if (iwl_is_rfkill(priv)) {
716 IWL_DEBUG_HC(priv, "Aborting scan due to RF Kill activation\n");
717 goto done;
718 }
719
720 if (!test_bit(STATUS_READY, &priv->status)) {
721 IWL_DEBUG_HC(priv, "Scan request while uninitialized. Queuing.\n");
722 goto done;
723 }
724
725 if (!priv->scan_bands) {
726 IWL_DEBUG_HC(priv, "Aborting scan due to no requested bands\n");
727 goto done;
728 }
729
730 if (!priv->scan) {
731 priv->scan = kmalloc(sizeof(struct iwl_scan_cmd) +
732 IWL_MAX_SCAN_SIZE, GFP_KERNEL);
733 if (!priv->scan) {
734 ret = -ENOMEM;
735 goto done;
736 }
737 }
738 scan = priv->scan;
739 memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE);
740
741 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
742 scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
743
744 if (iwl_is_associated(priv)) {
745 u16 interval = 0;
746 u32 extra;
747 u32 suspend_time = 100;
748 u32 scan_suspend_time = 100;
749 unsigned long flags;
750
751 IWL_DEBUG_INFO(priv, "Scanning while associated...\n");
752 spin_lock_irqsave(&priv->lock, flags);
753 interval = priv->beacon_int;
754 spin_unlock_irqrestore(&priv->lock, flags);
755
756 scan->suspend_time = 0;
757 scan->max_out_time = cpu_to_le32(200 * 1024);
758 if (!interval)
759 interval = suspend_time;
760
761 extra = (suspend_time / interval) << 22;
762 scan_suspend_time = (extra |
763 ((suspend_time % interval) * 1024));
764 scan->suspend_time = cpu_to_le32(scan_suspend_time);
765 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n",
766 scan_suspend_time, interval);
767 }
768
769 if (priv->is_internal_short_scan) {
770 IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n");
771 } else if (priv->scan_request->n_ssids) {
772 int i, p = 0;
773 IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
774 for (i = 0; i < priv->scan_request->n_ssids; i++) {
775 /* always does wildcard anyway */
776 if (!priv->scan_request->ssids[i].ssid_len)
777 continue;
778 scan->direct_scan[p].id = WLAN_EID_SSID;
779 scan->direct_scan[p].len =
780 priv->scan_request->ssids[i].ssid_len;
781 memcpy(scan->direct_scan[p].ssid,
782 priv->scan_request->ssids[i].ssid,
783 priv->scan_request->ssids[i].ssid_len);
784 n_probes++;
785 p++;
786 }
787 is_active = true;
788 } else
789 IWL_DEBUG_SCAN(priv, "Start passive scan.\n");
790
791 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
792 scan->tx_cmd.sta_id = priv->hw_params.bcast_sta_id;
793 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
794
795
796 if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) {
797 band = IEEE80211_BAND_2GHZ;
798 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
799 chan_mod = le32_to_cpu(priv->active_rxon.flags & RXON_FLG_CHANNEL_MODE_MSK)
800 >> RXON_FLG_CHANNEL_MODE_POS;
801 if (chan_mod == CHANNEL_MODE_PURE_40) {
802 rate = IWL_RATE_6M_PLCP;
803 } else {
804 rate = IWL_RATE_1M_PLCP;
805 rate_flags = RATE_MCS_CCK_MSK;
806 }
807 scan->good_CRC_th = 0;
808 } else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ)) {
809 band = IEEE80211_BAND_5GHZ;
810 rate = IWL_RATE_6M_PLCP;
811 /*
812 * If active scaning is requested but a certain channel
813 * is marked passive, we can do active scanning if we
814 * detect transmissions.
815 */
816 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH : 0;
817
818 /* Force use of chains B and C (0x6) for scan Rx for 4965
819 * Avoid A (0x1) because of its off-channel reception on A-band.
820 */
821 if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965)
822 rx_ant = ANT_BC;
823 } else {
824 IWL_WARN(priv, "Invalid scan band count\n");
825 goto done;
826 }
827
828 priv->scan_tx_ant[band] =
829 iwl_toggle_tx_ant(priv, priv->scan_tx_ant[band]);
830 rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]);
831 scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags);
832
833 /* In power save mode use one chain, otherwise use all chains */
834 if (test_bit(STATUS_POWER_PMI, &priv->status)) {
835 /* rx_ant has been set to all valid chains previously */
836 active_chains = rx_ant &
837 ((u8)(priv->chain_noise_data.active_chains));
838 if (!active_chains)
839 active_chains = rx_ant;
840
841 IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n",
842 priv->chain_noise_data.active_chains);
843
844 rx_ant = first_antenna(active_chains);
845 }
846 /* MIMO is not used here, but value is required */
847 rx_chain |= priv->hw_params.valid_rx_ant << RXON_RX_CHAIN_VALID_POS;
848 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS;
849 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS;
850 rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS;
851 scan->rx_chain = cpu_to_le16(rx_chain);
852 if (!priv->is_internal_short_scan) {
853 cmd_len = iwl_fill_probe_req(priv,
854 (struct ieee80211_mgmt *)scan->data,
855 priv->scan_request->ie,
856 priv->scan_request->ie_len,
857 IWL_MAX_SCAN_SIZE - sizeof(*scan));
858 } else {
859 cmd_len = iwl_fill_probe_req(priv,
860 (struct ieee80211_mgmt *)scan->data,
861 NULL, 0,
862 IWL_MAX_SCAN_SIZE - sizeof(*scan));
863
864 }
865 scan->tx_cmd.len = cpu_to_le16(cmd_len);
866 if (iwl_is_monitor_mode(priv))
867 scan->filter_flags = RXON_FILTER_PROMISC_MSK;
868
869 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
870 RXON_FILTER_BCON_AWARE_MSK);
871
872 if (priv->is_internal_short_scan) {
873 scan->channel_count =
874 iwl_get_single_channel_for_scan(priv, band,
875 (void *)&scan->data[le16_to_cpu(
876 scan->tx_cmd.len)]);
877 } else {
878 scan->channel_count =
879 iwl_get_channels_for_scan(priv, band,
880 is_active, n_probes,
881 (void *)&scan->data[le16_to_cpu(
882 scan->tx_cmd.len)]);
883 }
884 if (scan->channel_count == 0) {
885 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
886 goto done;
887 }
888
889 cmd.len += le16_to_cpu(scan->tx_cmd.len) +
890 scan->channel_count * sizeof(struct iwl_scan_channel);
891 cmd.data = scan;
892 scan->len = cpu_to_le16(cmd.len);
893
894 set_bit(STATUS_SCAN_HW, &priv->status);
895 ret = iwl_send_cmd_sync(priv, &cmd);
896 if (ret)
897 goto done;
898
899 queue_delayed_work(priv->workqueue, &priv->scan_check,
900 IWL_SCAN_CHECK_WATCHDOG);
901
902 mutex_unlock(&priv->mutex);
903 return;
904
905 done:
906 /* Cannot perform scan. Make sure we clear scanning
907 * bits from status so next scan request can be performed.
908 * If we don't clear scanning status bit here all next scan
909 * will fail
910 */
911 clear_bit(STATUS_SCAN_HW, &priv->status);
912 clear_bit(STATUS_SCANNING, &priv->status);
913 /* inform mac80211 scan aborted */
914 queue_work(priv->workqueue, &priv->scan_completed);
915 mutex_unlock(&priv->mutex);
916 }
917
918 void iwl_bg_abort_scan(struct work_struct *work)
919 {
920 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
921
922 if (!test_bit(STATUS_READY, &priv->status) ||
923 !test_bit(STATUS_GEO_CONFIGURED, &priv->status))
924 return;
925
926 mutex_lock(&priv->mutex);
927
928 set_bit(STATUS_SCAN_ABORTING, &priv->status);
929 iwl_send_scan_abort(priv);
930
931 mutex_unlock(&priv->mutex);
932 }
933 EXPORT_SYMBOL(iwl_bg_abort_scan);
934
935 void iwl_bg_scan_completed(struct work_struct *work)
936 {
937 struct iwl_priv *priv =
938 container_of(work, struct iwl_priv, scan_completed);
939
940 IWL_DEBUG_SCAN(priv, "SCAN complete scan\n");
941
942 cancel_delayed_work(&priv->scan_check);
943
944 if (!priv->is_internal_short_scan)
945 ieee80211_scan_completed(priv->hw, false);
946 else {
947 priv->is_internal_short_scan = false;
948 IWL_DEBUG_SCAN(priv, "internal short scan completed\n");
949 }
950
951 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
952 return;
953
954 /* Since setting the TXPOWER may have been deferred while
955 * performing the scan, fire one off */
956 mutex_lock(&priv->mutex);
957 iwl_set_tx_power(priv, priv->tx_power_user_lmt, true);
958 mutex_unlock(&priv->mutex);
959 }
960 EXPORT_SYMBOL(iwl_bg_scan_completed);
961
962 void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
963 {
964 INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
965 INIT_WORK(&priv->request_scan, iwl_bg_request_scan);
966 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
967 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
968 }
969 EXPORT_SYMBOL(iwl_setup_scan_deferred_work);
970
Linux kernel - Deliverables
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