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Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6/x86.git] / drivers / net / wireless / iwlwifi / iwl-scan.c
blobde0446d4bfe985c1ff636d172ff8c23e770542aa
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/slab.h>
29 #include <linux/types.h>
30 #include <linux/etherdevice.h>
31 #include <net/mac80211.h>
32
33 #include "iwl-eeprom.h"
34 #include "iwl-dev.h"
35 #include "iwl-core.h"
36 #include "iwl-sta.h"
37 #include "iwl-io.h"
38 #include "iwl-helpers.h"
39
40 /* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
41 * sending probe req. This should be set long enough to hear probe responses
42 * from more than one AP. */
43 #define IWL_ACTIVE_DWELL_TIME_24 (30) /* all times in msec */
44 #define IWL_ACTIVE_DWELL_TIME_52 (20)
45
46 #define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3)
47 #define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2)
48
49 /* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
50 * Must be set longer than active dwell time.
51 * For the most reliable scan, set > AP beacon interval (typically 100msec). */
52 #define IWL_PASSIVE_DWELL_TIME_24 (20) /* all times in msec */
53 #define IWL_PASSIVE_DWELL_TIME_52 (10)
54 #define IWL_PASSIVE_DWELL_BASE (100)
55 #define IWL_CHANNEL_TUNE_TIME 5
56
57
58
59 /**
60 * iwl_scan_cancel - Cancel any currently executing HW scan
61 *
62 * NOTE: priv->mutex is not required before calling this function
63 */
64 int iwl_scan_cancel(struct iwl_priv *priv)
65 {
66 if (!test_bit(STATUS_SCAN_HW, &priv->status)) {
67 clear_bit(STATUS_SCANNING, &priv->status);
68 return 0;
69 }
70
71 if (test_bit(STATUS_SCANNING, &priv->status)) {
72 if (!test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
73 IWL_DEBUG_SCAN(priv, "Queuing scan abort.\n");
74 set_bit(STATUS_SCAN_ABORTING, &priv->status);
75 queue_work(priv->workqueue, &priv->abort_scan);
76
77 } else
78 IWL_DEBUG_SCAN(priv, "Scan abort already in progress.\n");
79
80 return test_bit(STATUS_SCANNING, &priv->status);
81 }
82
83 return 0;
84 }
85 EXPORT_SYMBOL(iwl_scan_cancel);
86 /**
87 * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
88 * @ms: amount of time to wait (in milliseconds) for scan to abort
89 *
90 * NOTE: priv->mutex must be held before calling this function
91 */
92 int iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
93 {
94 unsigned long now = jiffies;
95 int ret;
96
97 ret = iwl_scan_cancel(priv);
98 if (ret && ms) {
99 mutex_unlock(&priv->mutex);
100 while (!time_after(jiffies, now + msecs_to_jiffies(ms)) &&
101 test_bit(STATUS_SCANNING, &priv->status))
102 msleep(1);
103 mutex_lock(&priv->mutex);
104
105 return test_bit(STATUS_SCANNING, &priv->status);
106 }
107
108 return ret;
109 }
110 EXPORT_SYMBOL(iwl_scan_cancel_timeout);
111
112 static int iwl_send_scan_abort(struct iwl_priv *priv)
113 {
114 int ret = 0;
115 struct iwl_rx_packet *pkt;
116 struct iwl_host_cmd cmd = {
117 .id = REPLY_SCAN_ABORT_CMD,
118 .flags = CMD_WANT_SKB,
119 };
120
121 /* If there isn't a scan actively going on in the hardware
122 * then we are in between scan bands and not actually
123 * actively scanning, so don't send the abort command */
124 if (!test_bit(STATUS_SCAN_HW, &priv->status)) {
125 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
126 return 0;
127 }
128
129 ret = iwl_send_cmd_sync(priv, &cmd);
130 if (ret) {
131 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
132 return ret;
133 }
134
135 pkt = (struct iwl_rx_packet *)cmd.reply_page;
136 if (pkt->u.status != CAN_ABORT_STATUS) {
137 /* The scan abort will return 1 for success or
138 * 2 for "failure". A failure condition can be
139 * due to simply not being in an active scan which
140 * can occur if we send the scan abort before we
141 * the microcode has notified us that a scan is
142 * completed. */
143 IWL_DEBUG_INFO(priv, "SCAN_ABORT returned %d.\n", pkt->u.status);
144 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
145 clear_bit(STATUS_SCAN_HW, &priv->status);
146 }
147
148 iwl_free_pages(priv, cmd.reply_page);
149
150 return ret;
151 }
152
153 /* Service response to REPLY_SCAN_CMD (0x80) */
154 static void iwl_rx_reply_scan(struct iwl_priv *priv,
155 struct iwl_rx_mem_buffer *rxb)
156 {
157 #ifdef CONFIG_IWLWIFI_DEBUG
158 struct iwl_rx_packet *pkt = rxb_addr(rxb);
159 struct iwl_scanreq_notification *notif =
160 (struct iwl_scanreq_notification *)pkt->u.raw;
161
162 IWL_DEBUG_RX(priv, "Scan request status = 0x%x\n", notif->status);
163 #endif
164 }
165
166 /* Service SCAN_START_NOTIFICATION (0x82) */
167 static void iwl_rx_scan_start_notif(struct iwl_priv *priv,
168 struct iwl_rx_mem_buffer *rxb)
169 {
170 struct iwl_rx_packet *pkt = rxb_addr(rxb);
171 struct iwl_scanstart_notification *notif =
172 (struct iwl_scanstart_notification *)pkt->u.raw;
173 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
174 IWL_DEBUG_SCAN(priv, "Scan start: "
175 "%d [802.11%s] "
176 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
177 notif->channel,
178 notif->band ? "bg" : "a",
179 le32_to_cpu(notif->tsf_high),
180 le32_to_cpu(notif->tsf_low),
181 notif->status, notif->beacon_timer);
182 }
183
184 /* Service SCAN_RESULTS_NOTIFICATION (0x83) */
185 static void iwl_rx_scan_results_notif(struct iwl_priv *priv,
186 struct iwl_rx_mem_buffer *rxb)
187 {
188 #ifdef CONFIG_IWLWIFI_DEBUG
189 struct iwl_rx_packet *pkt = rxb_addr(rxb);
190 struct iwl_scanresults_notification *notif =
191 (struct iwl_scanresults_notification *)pkt->u.raw;
192
193 IWL_DEBUG_SCAN(priv, "Scan ch.res: "
194 "%d [802.11%s] "
195 "(TSF: 0x%08X:%08X) - %d "
196 "elapsed=%lu usec\n",
197 notif->channel,
198 notif->band ? "bg" : "a",
199 le32_to_cpu(notif->tsf_high),
200 le32_to_cpu(notif->tsf_low),
201 le32_to_cpu(notif->statistics[0]),
202 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf);
203 #endif
204
205 if (!priv->is_internal_short_scan)
206 priv->next_scan_jiffies = 0;
207 }
208
209 /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
210 static void iwl_rx_scan_complete_notif(struct iwl_priv *priv,
211 struct iwl_rx_mem_buffer *rxb)
212 {
213 #ifdef CONFIG_IWLWIFI_DEBUG
214 struct iwl_rx_packet *pkt = rxb_addr(rxb);
215 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
216
217 IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
218 scan_notif->scanned_channels,
219 scan_notif->tsf_low,
220 scan_notif->tsf_high, scan_notif->status);
221 #endif
222
223 /* The HW is no longer scanning */
224 clear_bit(STATUS_SCAN_HW, &priv->status);
225
226 IWL_DEBUG_INFO(priv, "Scan pass on %sGHz took %dms\n",
227 (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) ?
228 "2.4" : "5.2",
229 jiffies_to_msecs(elapsed_jiffies
230 (priv->scan_pass_start, jiffies)));
231
232 /* Remove this scanned band from the list of pending
233 * bands to scan, band G precedes A in order of scanning
234 * as seen in iwl_bg_request_scan */
235 if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ))
236 priv->scan_bands &= ~BIT(IEEE80211_BAND_2GHZ);
237 else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ))
238 priv->scan_bands &= ~BIT(IEEE80211_BAND_5GHZ);
239
240 /* If a request to abort was given, or the scan did not succeed
241 * then we reset the scan state machine and terminate,
242 * re-queuing another scan if one has been requested */
243 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
244 IWL_DEBUG_INFO(priv, "Aborted scan completed.\n");
245 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
246 } else {
247 /* If there are more bands on this scan pass reschedule */
248 if (priv->scan_bands)
249 goto reschedule;
250 }
251
252 if (!priv->is_internal_short_scan)
253 priv->next_scan_jiffies = 0;
254
255 IWL_DEBUG_INFO(priv, "Setting scan to off\n");
256
257 clear_bit(STATUS_SCANNING, &priv->status);
258
259 IWL_DEBUG_INFO(priv, "Scan took %dms\n",
260 jiffies_to_msecs(elapsed_jiffies(priv->scan_start, jiffies)));
261
262 queue_work(priv->workqueue, &priv->scan_completed);
263
264 return;
265
266 reschedule:
267 priv->scan_pass_start = jiffies;
268 queue_work(priv->workqueue, &priv->request_scan);
269 }
270
271 void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
272 {
273 /* scan handlers */
274 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
275 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
276 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
277 iwl_rx_scan_results_notif;
278 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
279 iwl_rx_scan_complete_notif;
280 }
281 EXPORT_SYMBOL(iwl_setup_rx_scan_handlers);
282
283 inline u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
284 enum ieee80211_band band,
285 u8 n_probes)
286 {
287 if (band == IEEE80211_BAND_5GHZ)
288 return IWL_ACTIVE_DWELL_TIME_52 +
289 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
290 else
291 return IWL_ACTIVE_DWELL_TIME_24 +
292 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
293 }
294 EXPORT_SYMBOL(iwl_get_active_dwell_time);
295
296 u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
297 enum ieee80211_band band)
298 {
299 u16 passive = (band == IEEE80211_BAND_2GHZ) ?
300 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
301 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
302
303 if (iwl_is_associated(priv)) {
304 /* If we're associated, we clamp the maximum passive
305 * dwell time to be 98% of the beacon interval (minus
306 * 2 * channel tune time) */
307 passive = priv->beacon_int;
308 if ((passive > IWL_PASSIVE_DWELL_BASE) || !passive)
309 passive = IWL_PASSIVE_DWELL_BASE;
310 passive = (passive * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
311 }
312
313 return passive;
314 }
315 EXPORT_SYMBOL(iwl_get_passive_dwell_time);
316
317 static int iwl_get_single_channel_for_scan(struct iwl_priv *priv,
318 enum ieee80211_band band,
319 struct iwl_scan_channel *scan_ch)
320 {
321 const struct ieee80211_supported_band *sband;
322 const struct iwl_channel_info *ch_info;
323 u16 passive_dwell = 0;
324 u16 active_dwell = 0;
325 int i, added = 0;
326 u16 channel = 0;
327
328 sband = iwl_get_hw_mode(priv, band);
329 if (!sband) {
330 IWL_ERR(priv, "invalid band\n");
331 return added;
332 }
333
334 active_dwell = iwl_get_active_dwell_time(priv, band, 0);
335 passive_dwell = iwl_get_passive_dwell_time(priv, band);
336
337 if (passive_dwell <= active_dwell)
338 passive_dwell = active_dwell + 1;
339
340 /* only scan single channel, good enough to reset the RF */
341 /* pick the first valid not in-use channel */
342 if (band == IEEE80211_BAND_5GHZ) {
343 for (i = 14; i < priv->channel_count; i++) {
344 if (priv->channel_info[i].channel !=
345 le16_to_cpu(priv->staging_rxon.channel)) {
346 channel = priv->channel_info[i].channel;
347 ch_info = iwl_get_channel_info(priv,
348 band, channel);
349 if (is_channel_valid(ch_info))
350 break;
351 }
352 }
353 } else {
354 for (i = 0; i < 14; i++) {
355 if (priv->channel_info[i].channel !=
356 le16_to_cpu(priv->staging_rxon.channel)) {
357 channel =
358 priv->channel_info[i].channel;
359 ch_info = iwl_get_channel_info(priv,
360 band, channel);
361 if (is_channel_valid(ch_info))
362 break;
363 }
364 }
365 }
366 if (channel) {
367 scan_ch->channel = cpu_to_le16(channel);
368 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
369 scan_ch->active_dwell = cpu_to_le16(active_dwell);
370 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
371 /* Set txpower levels to defaults */
372 scan_ch->dsp_atten = 110;
373 if (band == IEEE80211_BAND_5GHZ)
374 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
375 else
376 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
377 added++;
378 } else
379 IWL_ERR(priv, "no valid channel found\n");
380 return added;
381 }
382
383 static int iwl_get_channels_for_scan(struct iwl_priv *priv,
384 enum ieee80211_band band,
385 u8 is_active, u8 n_probes,
386 struct iwl_scan_channel *scan_ch)
387 {
388 struct ieee80211_channel *chan;
389 const struct ieee80211_supported_band *sband;
390 const struct iwl_channel_info *ch_info;
391 u16 passive_dwell = 0;
392 u16 active_dwell = 0;
393 int added, i;
394 u16 channel;
395
396 sband = iwl_get_hw_mode(priv, band);
397 if (!sband)
398 return 0;
399
400 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
401 passive_dwell = iwl_get_passive_dwell_time(priv, band);
402
403 if (passive_dwell <= active_dwell)
404 passive_dwell = active_dwell + 1;
405
406 for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) {
407 chan = priv->scan_request->channels[i];
408
409 if (chan->band != band)
410 continue;
411
412 channel = ieee80211_frequency_to_channel(chan->center_freq);
413 scan_ch->channel = cpu_to_le16(channel);
414
415 ch_info = iwl_get_channel_info(priv, band, channel);
416 if (!is_channel_valid(ch_info)) {
417 IWL_DEBUG_SCAN(priv, "Channel %d is INVALID for this band.\n",
418 channel);
419 continue;
420 }
421
422 if (!is_active || is_channel_passive(ch_info) ||
423 (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN))
424 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
425 else
426 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
427
428 if (n_probes)
429 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
430
431 scan_ch->active_dwell = cpu_to_le16(active_dwell);
432 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
433
434 /* Set txpower levels to defaults */
435 scan_ch->dsp_atten = 110;
436
437 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
438 * power level:
439 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
440 */
441 if (band == IEEE80211_BAND_5GHZ)
442 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
443 else
444 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
445
446 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n",
447 channel, le32_to_cpu(scan_ch->type),
448 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
449 "ACTIVE" : "PASSIVE",
450 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
451 active_dwell : passive_dwell);
452
453 scan_ch++;
454 added++;
455 }
456
457 IWL_DEBUG_SCAN(priv, "total channels to scan %d\n", added);
458 return added;
459 }
460
461 void iwl_init_scan_params(struct iwl_priv *priv)
462 {
463 u8 ant_idx = fls(priv->hw_params.valid_tx_ant) - 1;
464 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
465 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
466 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
467 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
468 }
469 EXPORT_SYMBOL(iwl_init_scan_params);
470
471 static int iwl_scan_initiate(struct iwl_priv *priv)
472 {
473 WARN_ON(!mutex_is_locked(&priv->mutex));
474
475 IWL_DEBUG_INFO(priv, "Starting scan...\n");
476 set_bit(STATUS_SCANNING, &priv->status);
477 priv->is_internal_short_scan = false;
478 priv->scan_start = jiffies;
479 priv->scan_pass_start = priv->scan_start;
480
481 queue_work(priv->workqueue, &priv->request_scan);
482
483 return 0;
484 }
485
486 #define IWL_DELAY_NEXT_SCAN (HZ*2)
487
488 int iwl_mac_hw_scan(struct ieee80211_hw *hw,
489 struct cfg80211_scan_request *req)
490 {
491 unsigned long flags;
492 struct iwl_priv *priv = hw->priv;
493 int ret, i;
494
495 IWL_DEBUG_MAC80211(priv, "enter\n");
496
497 mutex_lock(&priv->mutex);
498 spin_lock_irqsave(&priv->lock, flags);
499
500 if (!iwl_is_ready_rf(priv)) {
501 ret = -EIO;
502 IWL_DEBUG_MAC80211(priv, "leave - not ready or exit pending\n");
503 goto out_unlock;
504 }
505
506 if (test_bit(STATUS_SCANNING, &priv->status)) {
507 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
508 ret = -EAGAIN;
509 goto out_unlock;
510 }
511
512 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
513 IWL_DEBUG_SCAN(priv, "Scan request while abort pending\n");
514 ret = -EAGAIN;
515 goto out_unlock;
516 }
517
518 /* We don't schedule scan within next_scan_jiffies period.
519 * Avoid scanning during possible EAPOL exchange, return
520 * success immediately.
521 */
522 if (priv->next_scan_jiffies &&
523 time_after(priv->next_scan_jiffies, jiffies)) {
524 IWL_DEBUG_SCAN(priv, "scan rejected: within next scan period\n");
525 queue_work(priv->workqueue, &priv->scan_completed);
526 ret = 0;
527 goto out_unlock;
528 }
529
530 priv->scan_bands = 0;
531 for (i = 0; i < req->n_channels; i++)
532 priv->scan_bands |= BIT(req->channels[i]->band);
533
534 priv->scan_request = req;
535
536 ret = iwl_scan_initiate(priv);
537
538 IWL_DEBUG_MAC80211(priv, "leave\n");
539
540 out_unlock:
541 spin_unlock_irqrestore(&priv->lock, flags);
542 mutex_unlock(&priv->mutex);
543
544 return ret;
545 }
546 EXPORT_SYMBOL(iwl_mac_hw_scan);
547
548 /*
549 * internal short scan, this function should only been called while associated.
550 * It will reset and tune the radio to prevent possible RF related problem
551 */
552 void iwl_internal_short_hw_scan(struct iwl_priv *priv)
553 {
554 queue_work(priv->workqueue, &priv->start_internal_scan);
555 }
556
557 static void iwl_bg_start_internal_scan(struct work_struct *work)
558 {
559 struct iwl_priv *priv =
560 container_of(work, struct iwl_priv, start_internal_scan);
561
562 mutex_lock(&priv->mutex);
563
564 if (!iwl_is_ready_rf(priv)) {
565 IWL_DEBUG_SCAN(priv, "not ready or exit pending\n");
566 goto unlock;
567 }
568
569 if (test_bit(STATUS_SCANNING, &priv->status)) {
570 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
571 goto unlock;
572 }
573
574 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
575 IWL_DEBUG_SCAN(priv, "Scan request while abort pending\n");
576 goto unlock;
577 }
578
579 priv->scan_bands = 0;
580 if (priv->band == IEEE80211_BAND_5GHZ)
581 priv->scan_bands |= BIT(IEEE80211_BAND_5GHZ);
582 else
583 priv->scan_bands |= BIT(IEEE80211_BAND_2GHZ);
584
585 IWL_DEBUG_SCAN(priv, "Start internal short scan...\n");
586 set_bit(STATUS_SCANNING, &priv->status);
587 priv->is_internal_short_scan = true;
588 queue_work(priv->workqueue, &priv->request_scan);
589 unlock:
590 mutex_unlock(&priv->mutex);
591 }
592
593 #define IWL_SCAN_CHECK_WATCHDOG (7 * HZ)
594
595 void iwl_bg_scan_check(struct work_struct *data)
596 {
597 struct iwl_priv *priv =
598 container_of(data, struct iwl_priv, scan_check.work);
599
600 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
601 return;
602
603 mutex_lock(&priv->mutex);
604 if (test_bit(STATUS_SCANNING, &priv->status) ||
605 test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
606 IWL_DEBUG_SCAN(priv, "Scan completion watchdog resetting "
607 "adapter (%dms)\n",
608 jiffies_to_msecs(IWL_SCAN_CHECK_WATCHDOG));
609
610 if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
611 iwl_send_scan_abort(priv);
612 }
613 mutex_unlock(&priv->mutex);
614 }
615 EXPORT_SYMBOL(iwl_bg_scan_check);
616
617 /**
618 * iwl_fill_probe_req - fill in all required fields and IE for probe request
619 */
620
621 u16 iwl_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame,
622 const u8 *ies, int ie_len, int left)
623 {
624 int len = 0;
625 u8 *pos = NULL;
626
627 /* Make sure there is enough space for the probe request,
628 * two mandatory IEs and the data */
629 left -= 24;
630 if (left < 0)
631 return 0;
632
633 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
634 memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
635 memcpy(frame->sa, priv->mac_addr, ETH_ALEN);
636 memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
637 frame->seq_ctrl = 0;
638
639 len += 24;
640
641 /* ...next IE... */
642 pos = &frame->u.probe_req.variable[0];
643
644 /* fill in our indirect SSID IE */
645 left -= 2;
646 if (left < 0)
647 return 0;
648 *pos++ = WLAN_EID_SSID;
649 *pos++ = 0;
650
651 len += 2;
652
653 if (WARN_ON(left < ie_len))
654 return len;
655
656 if (ies)
657 memcpy(pos, ies, ie_len);
658 len += ie_len;
659 left -= ie_len;
660
661 return (u16)len;
662 }
663 EXPORT_SYMBOL(iwl_fill_probe_req);
664
665 static void iwl_bg_request_scan(struct work_struct *data)
666 {
667 struct iwl_priv *priv =
668 container_of(data, struct iwl_priv, request_scan);
669 struct iwl_host_cmd cmd = {
670 .id = REPLY_SCAN_CMD,
671 .len = sizeof(struct iwl_scan_cmd),
672 .flags = CMD_SIZE_HUGE,
673 };
674 struct iwl_scan_cmd *scan;
675 struct ieee80211_conf *conf = NULL;
676 u32 rate_flags = 0;
677 u16 cmd_len;
678 u16 rx_chain = 0;
679 enum ieee80211_band band;
680 u8 n_probes = 0;
681 u8 rx_ant = priv->hw_params.valid_rx_ant;
682 u8 rate;
683 bool is_active = false;
684 int chan_mod;
685 u8 active_chains;
686
687 conf = ieee80211_get_hw_conf(priv->hw);
688
689 mutex_lock(&priv->mutex);
690
691 cancel_delayed_work(&priv->scan_check);
692
693 if (!iwl_is_ready(priv)) {
694 IWL_WARN(priv, "request scan called when driver not ready.\n");
695 goto done;
696 }
697
698 /* Make sure the scan wasn't canceled before this queued work
699 * was given the chance to run... */
700 if (!test_bit(STATUS_SCANNING, &priv->status))
701 goto done;
702
703 /* This should never be called or scheduled if there is currently
704 * a scan active in the hardware. */
705 if (test_bit(STATUS_SCAN_HW, &priv->status)) {
706 IWL_DEBUG_INFO(priv, "Multiple concurrent scan requests in parallel. "
707 "Ignoring second request.\n");
708 goto done;
709 }
710
711 if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
712 IWL_DEBUG_SCAN(priv, "Aborting scan due to device shutdown\n");
713 goto done;
714 }
715
716 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
717 IWL_DEBUG_HC(priv, "Scan request while abort pending. Queuing.\n");
718 goto done;
719 }
720
721 if (iwl_is_rfkill(priv)) {
722 IWL_DEBUG_HC(priv, "Aborting scan due to RF Kill activation\n");
723 goto done;
724 }
725
726 if (!test_bit(STATUS_READY, &priv->status)) {
727 IWL_DEBUG_HC(priv, "Scan request while uninitialized. Queuing.\n");
728 goto done;
729 }
730
731 if (!priv->scan_bands) {
732 IWL_DEBUG_HC(priv, "Aborting scan due to no requested bands\n");
733 goto done;
734 }
735
736 if (!priv->scan) {
737 priv->scan = kmalloc(sizeof(struct iwl_scan_cmd) +
738 IWL_MAX_SCAN_SIZE, GFP_KERNEL);
739 if (!priv->scan) {
740 IWL_DEBUG_SCAN(priv,
741 "fail to allocate memory for scan\n");
742 goto done;
743 }
744 }
745 scan = priv->scan;
746 memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE);
747
748 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
749 scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
750
751 if (iwl_is_associated(priv)) {
752 u16 interval = 0;
753 u32 extra;
754 u32 suspend_time = 100;
755 u32 scan_suspend_time = 100;
756 unsigned long flags;
757
758 IWL_DEBUG_INFO(priv, "Scanning while associated...\n");
759 spin_lock_irqsave(&priv->lock, flags);
760 interval = priv->beacon_int;
761 spin_unlock_irqrestore(&priv->lock, flags);
762
763 scan->suspend_time = 0;
764 scan->max_out_time = cpu_to_le32(200 * 1024);
765 if (!interval)
766 interval = suspend_time;
767
768 extra = (suspend_time / interval) << 22;
769 scan_suspend_time = (extra |
770 ((suspend_time % interval) * 1024));
771 scan->suspend_time = cpu_to_le32(scan_suspend_time);
772 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n",
773 scan_suspend_time, interval);
774 }
775
776 if (priv->is_internal_short_scan) {
777 IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n");
778 } else if (priv->scan_request->n_ssids) {
779 int i, p = 0;
780 IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
781 for (i = 0; i < priv->scan_request->n_ssids; i++) {
782 /* always does wildcard anyway */
783 if (!priv->scan_request->ssids[i].ssid_len)
784 continue;
785 scan->direct_scan[p].id = WLAN_EID_SSID;
786 scan->direct_scan[p].len =
787 priv->scan_request->ssids[i].ssid_len;
788 memcpy(scan->direct_scan[p].ssid,
789 priv->scan_request->ssids[i].ssid,
790 priv->scan_request->ssids[i].ssid_len);
791 n_probes++;
792 p++;
793 }
794 is_active = true;
795 } else
796 IWL_DEBUG_SCAN(priv, "Start passive scan.\n");
797
798 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
799 scan->tx_cmd.sta_id = priv->hw_params.bcast_sta_id;
800 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
801
802
803 if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) {
804 band = IEEE80211_BAND_2GHZ;
805 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
806 chan_mod = le32_to_cpu(priv->active_rxon.flags & RXON_FLG_CHANNEL_MODE_MSK)
807 >> RXON_FLG_CHANNEL_MODE_POS;
808 if (chan_mod == CHANNEL_MODE_PURE_40) {
809 rate = IWL_RATE_6M_PLCP;
810 } else {
811 rate = IWL_RATE_1M_PLCP;
812 rate_flags = RATE_MCS_CCK_MSK;
813 }
814 scan->good_CRC_th = 0;
815 } else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ)) {
816 band = IEEE80211_BAND_5GHZ;
817 rate = IWL_RATE_6M_PLCP;
818 /*
819 * If active scaning is requested but a certain channel
820 * is marked passive, we can do active scanning if we
821 * detect transmissions.
822 */
823 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH : 0;
824
825 /* Force use of chains B and C (0x6) for scan Rx
826 * Avoid A (0x1) for the device has off-channel reception
827 * on A-band.
828 */
829 if (priv->cfg->off_channel_workaround)
830 rx_ant = ANT_BC;
831 } else {
832 IWL_WARN(priv, "Invalid scan band count\n");
833 goto done;
834 }
835
836 priv->scan_tx_ant[band] =
837 iwl_toggle_tx_ant(priv, priv->scan_tx_ant[band]);
838 rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]);
839 scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags);
840
841 /* In power save mode use one chain, otherwise use all chains */
842 if (test_bit(STATUS_POWER_PMI, &priv->status)) {
843 /* rx_ant has been set to all valid chains previously */
844 active_chains = rx_ant &
845 ((u8)(priv->chain_noise_data.active_chains));
846 if (!active_chains)
847 active_chains = rx_ant;
848
849 IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n",
850 priv->chain_noise_data.active_chains);
851
852 rx_ant = first_antenna(active_chains);
853 }
854 /* MIMO is not used here, but value is required */
855 rx_chain |= priv->hw_params.valid_rx_ant << RXON_RX_CHAIN_VALID_POS;
856 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS;
857 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS;
858 rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS;
859 scan->rx_chain = cpu_to_le16(rx_chain);
860 if (!priv->is_internal_short_scan) {
861 cmd_len = iwl_fill_probe_req(priv,
862 (struct ieee80211_mgmt *)scan->data,
863 priv->scan_request->ie,
864 priv->scan_request->ie_len,
865 IWL_MAX_SCAN_SIZE - sizeof(*scan));
866 } else {
867 cmd_len = iwl_fill_probe_req(priv,
868 (struct ieee80211_mgmt *)scan->data,
869 NULL, 0,
870 IWL_MAX_SCAN_SIZE - sizeof(*scan));
871
872 }
873 scan->tx_cmd.len = cpu_to_le16(cmd_len);
874 if (iwl_is_monitor_mode(priv))
875 scan->filter_flags = RXON_FILTER_PROMISC_MSK;
876
877 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
878 RXON_FILTER_BCON_AWARE_MSK);
879
880 if (priv->is_internal_short_scan) {
881 scan->channel_count =
882 iwl_get_single_channel_for_scan(priv, band,
883 (void *)&scan->data[le16_to_cpu(
884 scan->tx_cmd.len)]);
885 } else {
886 scan->channel_count =
887 iwl_get_channels_for_scan(priv, band,
888 is_active, n_probes,
889 (void *)&scan->data[le16_to_cpu(
890 scan->tx_cmd.len)]);
891 }
892 if (scan->channel_count == 0) {
893 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
894 goto done;
895 }
896
897 cmd.len += le16_to_cpu(scan->tx_cmd.len) +
898 scan->channel_count * sizeof(struct iwl_scan_channel);
899 cmd.data = scan;
900 scan->len = cpu_to_le16(cmd.len);
901
902 set_bit(STATUS_SCAN_HW, &priv->status);
903 if (iwl_send_cmd_sync(priv, &cmd))
904 goto done;
905
906 queue_delayed_work(priv->workqueue, &priv->scan_check,
907 IWL_SCAN_CHECK_WATCHDOG);
908
909 mutex_unlock(&priv->mutex);
910 return;
911
912 done:
913 /* Cannot perform scan. Make sure we clear scanning
914 * bits from status so next scan request can be performed.
915 * If we don't clear scanning status bit here all next scan
916 * will fail
917 */
918 clear_bit(STATUS_SCAN_HW, &priv->status);
919 clear_bit(STATUS_SCANNING, &priv->status);
920 /* inform mac80211 scan aborted */
921 queue_work(priv->workqueue, &priv->scan_completed);
922 mutex_unlock(&priv->mutex);
923 }
924
925 void iwl_bg_abort_scan(struct work_struct *work)
926 {
927 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
928
929 if (!test_bit(STATUS_READY, &priv->status) ||
930 !test_bit(STATUS_GEO_CONFIGURED, &priv->status))
931 return;
932
933 mutex_lock(&priv->mutex);
934
935 set_bit(STATUS_SCAN_ABORTING, &priv->status);
936 iwl_send_scan_abort(priv);
937
938 mutex_unlock(&priv->mutex);
939 }
940 EXPORT_SYMBOL(iwl_bg_abort_scan);
941
942 void iwl_bg_scan_completed(struct work_struct *work)
943 {
944 struct iwl_priv *priv =
945 container_of(work, struct iwl_priv, scan_completed);
946
947 IWL_DEBUG_SCAN(priv, "SCAN complete scan\n");
948
949 cancel_delayed_work(&priv->scan_check);
950
951 if (!priv->is_internal_short_scan)
952 ieee80211_scan_completed(priv->hw, false);
953 else {
954 priv->is_internal_short_scan = false;
955 IWL_DEBUG_SCAN(priv, "internal short scan completed\n");
956 }
957
958 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
959 return;
960
961 /* Since setting the TXPOWER may have been deferred while
962 * performing the scan, fire one off */
963 mutex_lock(&priv->mutex);
964 iwl_set_tx_power(priv, priv->tx_power_user_lmt, true);
965 mutex_unlock(&priv->mutex);
966 }
967 EXPORT_SYMBOL(iwl_bg_scan_completed);
968
969 void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
970 {
971 INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
972 INIT_WORK(&priv->request_scan, iwl_bg_request_scan);
973 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
974 INIT_WORK(&priv->start_internal_scan, iwl_bg_start_internal_scan);
975 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
976 }
977 EXPORT_SYMBOL(iwl_setup_scan_deferred_work);
978
x86 "subsystem" repository