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iwlwifi: move mutex out of shared
[deliverable/linux.git] / drivers / net / wireless / iwlwifi / iwl-scan.c
1 /******************************************************************************
2 *
3 * GPL LICENSE SUMMARY
4 *
5 * Copyright(c) 2008 - 2012 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-io.h"
37 #include "iwl-agn.h"
38 #include "iwl-trans.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 static int iwl_send_scan_abort(struct iwl_priv *priv)
58 {
59 int ret;
60 struct iwl_rx_packet *pkt;
61 struct iwl_host_cmd cmd = {
62 .id = REPLY_SCAN_ABORT_CMD,
63 .flags = CMD_SYNC | CMD_WANT_SKB,
64 };
65
66 /* Exit instantly with error when device is not ready
67 * to receive scan abort command or it does not perform
68 * hardware scan currently */
69 if (!test_bit(STATUS_READY, &priv->shrd->status) ||
70 !test_bit(STATUS_GEO_CONFIGURED, &priv->shrd->status) ||
71 !test_bit(STATUS_SCAN_HW, &priv->shrd->status) ||
72 test_bit(STATUS_FW_ERROR, &priv->shrd->status))
73 return -EIO;
74
75 ret = iwl_dvm_send_cmd(priv, &cmd);
76 if (ret)
77 return ret;
78
79 pkt = cmd.resp_pkt;
80 if (pkt->u.status != CAN_ABORT_STATUS) {
81 /* The scan abort will return 1 for success or
82 * 2 for "failure". A failure condition can be
83 * due to simply not being in an active scan which
84 * can occur if we send the scan abort before we
85 * the microcode has notified us that a scan is
86 * completed. */
87 IWL_DEBUG_SCAN(priv, "SCAN_ABORT ret %d.\n", pkt->u.status);
88 ret = -EIO;
89 }
90
91 iwl_free_resp(&cmd);
92 return ret;
93 }
94
95 static void iwl_complete_scan(struct iwl_priv *priv, bool aborted)
96 {
97 /* check if scan was requested from mac80211 */
98 if (priv->scan_request) {
99 IWL_DEBUG_SCAN(priv, "Complete scan in mac80211\n");
100 ieee80211_scan_completed(priv->hw, aborted);
101 }
102
103 if (priv->scan_type == IWL_SCAN_ROC) {
104 ieee80211_remain_on_channel_expired(priv->hw);
105 priv->hw_roc_channel = NULL;
106 schedule_delayed_work(&priv->hw_roc_disable_work, 10 * HZ);
107 }
108
109 priv->scan_type = IWL_SCAN_NORMAL;
110 priv->scan_vif = NULL;
111 priv->scan_request = NULL;
112 }
113
114 static void iwl_process_scan_complete(struct iwl_priv *priv)
115 {
116 bool aborted;
117
118 lockdep_assert_held(&priv->mutex);
119
120 if (!test_and_clear_bit(STATUS_SCAN_COMPLETE, &priv->shrd->status))
121 return;
122
123 IWL_DEBUG_SCAN(priv, "Completed scan.\n");
124
125 cancel_delayed_work(&priv->scan_check);
126
127 aborted = test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->shrd->status);
128 if (aborted)
129 IWL_DEBUG_SCAN(priv, "Aborted scan completed.\n");
130
131 if (!test_and_clear_bit(STATUS_SCANNING, &priv->shrd->status)) {
132 IWL_DEBUG_SCAN(priv, "Scan already completed.\n");
133 goto out_settings;
134 }
135
136 if (priv->scan_type == IWL_SCAN_ROC) {
137 ieee80211_remain_on_channel_expired(priv->hw);
138 priv->hw_roc_channel = NULL;
139 schedule_delayed_work(&priv->hw_roc_disable_work, 10 * HZ);
140 }
141
142 if (priv->scan_type != IWL_SCAN_NORMAL && !aborted) {
143 int err;
144
145 /* Check if mac80211 requested scan during our internal scan */
146 if (priv->scan_request == NULL)
147 goto out_complete;
148
149 /* If so request a new scan */
150 err = iwl_scan_initiate(priv, priv->scan_vif, IWL_SCAN_NORMAL,
151 priv->scan_request->channels[0]->band);
152 if (err) {
153 IWL_DEBUG_SCAN(priv,
154 "failed to initiate pending scan: %d\n", err);
155 aborted = true;
156 goto out_complete;
157 }
158
159 return;
160 }
161
162 out_complete:
163 iwl_complete_scan(priv, aborted);
164
165 out_settings:
166 /* Can we still talk to firmware ? */
167 if (!iwl_is_ready_rf(priv->shrd))
168 return;
169
170 iwlagn_post_scan(priv);
171 }
172
173 void iwl_force_scan_end(struct iwl_priv *priv)
174 {
175 lockdep_assert_held(&priv->mutex);
176
177 if (!test_bit(STATUS_SCANNING, &priv->shrd->status)) {
178 IWL_DEBUG_SCAN(priv, "Forcing scan end while not scanning\n");
179 return;
180 }
181
182 IWL_DEBUG_SCAN(priv, "Forcing scan end\n");
183 clear_bit(STATUS_SCANNING, &priv->shrd->status);
184 clear_bit(STATUS_SCAN_HW, &priv->shrd->status);
185 clear_bit(STATUS_SCAN_ABORTING, &priv->shrd->status);
186 clear_bit(STATUS_SCAN_COMPLETE, &priv->shrd->status);
187 iwl_complete_scan(priv, true);
188 }
189
190 static void iwl_do_scan_abort(struct iwl_priv *priv)
191 {
192 int ret;
193
194 lockdep_assert_held(&priv->mutex);
195
196 if (!test_bit(STATUS_SCANNING, &priv->shrd->status)) {
197 IWL_DEBUG_SCAN(priv, "Not performing scan to abort\n");
198 return;
199 }
200
201 if (test_and_set_bit(STATUS_SCAN_ABORTING, &priv->shrd->status)) {
202 IWL_DEBUG_SCAN(priv, "Scan abort in progress\n");
203 return;
204 }
205
206 ret = iwl_send_scan_abort(priv);
207 if (ret) {
208 IWL_DEBUG_SCAN(priv, "Send scan abort failed %d\n", ret);
209 iwl_force_scan_end(priv);
210 } else
211 IWL_DEBUG_SCAN(priv, "Successfully send scan abort\n");
212 }
213
214 /**
215 * iwl_scan_cancel - Cancel any currently executing HW scan
216 */
217 int iwl_scan_cancel(struct iwl_priv *priv)
218 {
219 IWL_DEBUG_SCAN(priv, "Queuing abort scan\n");
220 queue_work(priv->workqueue, &priv->abort_scan);
221 return 0;
222 }
223
224 /**
225 * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
226 * @ms: amount of time to wait (in milliseconds) for scan to abort
227 *
228 */
229 void iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
230 {
231 unsigned long timeout = jiffies + msecs_to_jiffies(ms);
232
233 lockdep_assert_held(&priv->mutex);
234
235 IWL_DEBUG_SCAN(priv, "Scan cancel timeout\n");
236
237 iwl_do_scan_abort(priv);
238
239 while (time_before_eq(jiffies, timeout)) {
240 if (!test_bit(STATUS_SCAN_HW, &priv->shrd->status))
241 goto finished;
242 msleep(20);
243 }
244
245 return;
246
247 finished:
248 /*
249 * Now STATUS_SCAN_HW is clear. This means that the
250 * device finished, but the background work is going
251 * to execute at best as soon as we release the mutex.
252 * Since we need to be able to issue a new scan right
253 * after this function returns, run the complete here.
254 * The STATUS_SCAN_COMPLETE bit will then be cleared
255 * and prevent the background work from "completing"
256 * a possible new scan.
257 */
258 iwl_process_scan_complete(priv);
259 }
260
261 /* Service response to REPLY_SCAN_CMD (0x80) */
262 static int iwl_rx_reply_scan(struct iwl_priv *priv,
263 struct iwl_rx_cmd_buffer *rxb,
264 struct iwl_device_cmd *cmd)
265 {
266 #ifdef CONFIG_IWLWIFI_DEBUG
267 struct iwl_rx_packet *pkt = rxb_addr(rxb);
268 struct iwl_scanreq_notification *notif =
269 (struct iwl_scanreq_notification *)pkt->u.raw;
270
271 IWL_DEBUG_SCAN(priv, "Scan request status = 0x%x\n", notif->status);
272 #endif
273 return 0;
274 }
275
276 /* Service SCAN_START_NOTIFICATION (0x82) */
277 static int iwl_rx_scan_start_notif(struct iwl_priv *priv,
278 struct iwl_rx_cmd_buffer *rxb,
279 struct iwl_device_cmd *cmd)
280 {
281 struct iwl_rx_packet *pkt = rxb_addr(rxb);
282 struct iwl_scanstart_notification *notif =
283 (struct iwl_scanstart_notification *)pkt->u.raw;
284 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
285 IWL_DEBUG_SCAN(priv, "Scan start: "
286 "%d [802.11%s] "
287 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
288 notif->channel,
289 notif->band ? "bg" : "a",
290 le32_to_cpu(notif->tsf_high),
291 le32_to_cpu(notif->tsf_low),
292 notif->status, notif->beacon_timer);
293
294 if (priv->scan_type == IWL_SCAN_ROC &&
295 !priv->hw_roc_start_notified) {
296 ieee80211_ready_on_channel(priv->hw);
297 priv->hw_roc_start_notified = true;
298 }
299
300 return 0;
301 }
302
303 /* Service SCAN_RESULTS_NOTIFICATION (0x83) */
304 static int iwl_rx_scan_results_notif(struct iwl_priv *priv,
305 struct iwl_rx_cmd_buffer *rxb,
306 struct iwl_device_cmd *cmd)
307 {
308 #ifdef CONFIG_IWLWIFI_DEBUG
309 struct iwl_rx_packet *pkt = rxb_addr(rxb);
310 struct iwl_scanresults_notification *notif =
311 (struct iwl_scanresults_notification *)pkt->u.raw;
312
313 IWL_DEBUG_SCAN(priv, "Scan ch.res: "
314 "%d [802.11%s] "
315 "probe status: %u:%u "
316 "(TSF: 0x%08X:%08X) - %d "
317 "elapsed=%lu usec\n",
318 notif->channel,
319 notif->band ? "bg" : "a",
320 notif->probe_status, notif->num_probe_not_sent,
321 le32_to_cpu(notif->tsf_high),
322 le32_to_cpu(notif->tsf_low),
323 le32_to_cpu(notif->statistics[0]),
324 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf);
325 #endif
326 return 0;
327 }
328
329 /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
330 static int iwl_rx_scan_complete_notif(struct iwl_priv *priv,
331 struct iwl_rx_cmd_buffer *rxb,
332 struct iwl_device_cmd *cmd)
333 {
334 struct iwl_rx_packet *pkt = rxb_addr(rxb);
335 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
336
337 IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
338 scan_notif->scanned_channels,
339 scan_notif->tsf_low,
340 scan_notif->tsf_high, scan_notif->status);
341
342 IWL_DEBUG_SCAN(priv, "Scan on %sGHz took %dms\n",
343 (priv->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2",
344 jiffies_to_msecs(jiffies - priv->scan_start));
345
346 /*
347 * When aborting, we run the scan completed background work inline
348 * and the background work must then do nothing. The SCAN_COMPLETE
349 * bit helps implement that logic and thus needs to be set before
350 * queueing the work. Also, since the scan abort waits for SCAN_HW
351 * to clear, we need to set SCAN_COMPLETE before clearing SCAN_HW
352 * to avoid a race there.
353 */
354 set_bit(STATUS_SCAN_COMPLETE, &priv->shrd->status);
355 clear_bit(STATUS_SCAN_HW, &priv->shrd->status);
356 queue_work(priv->workqueue, &priv->scan_completed);
357
358 if (priv->iw_mode != NL80211_IFTYPE_ADHOC &&
359 iwl_advanced_bt_coexist(priv) &&
360 priv->bt_status != scan_notif->bt_status) {
361 if (scan_notif->bt_status) {
362 /* BT on */
363 if (!priv->bt_ch_announce)
364 priv->bt_traffic_load =
365 IWL_BT_COEX_TRAFFIC_LOAD_HIGH;
366 /*
367 * otherwise, no traffic load information provided
368 * no changes made
369 */
370 } else {
371 /* BT off */
372 priv->bt_traffic_load =
373 IWL_BT_COEX_TRAFFIC_LOAD_NONE;
374 }
375 priv->bt_status = scan_notif->bt_status;
376 queue_work(priv->workqueue,
377 &priv->bt_traffic_change_work);
378 }
379 return 0;
380 }
381
382 void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
383 {
384 /* scan handlers */
385 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
386 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
387 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
388 iwl_rx_scan_results_notif;
389 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
390 iwl_rx_scan_complete_notif;
391 }
392
393 static u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
394 enum ieee80211_band band, u8 n_probes)
395 {
396 if (band == IEEE80211_BAND_5GHZ)
397 return IWL_ACTIVE_DWELL_TIME_52 +
398 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
399 else
400 return IWL_ACTIVE_DWELL_TIME_24 +
401 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
402 }
403
404 static u16 iwl_limit_dwell(struct iwl_priv *priv, u16 dwell_time)
405 {
406 struct iwl_rxon_context *ctx;
407
408 /*
409 * If we're associated, we clamp the dwell time 98%
410 * of the smallest beacon interval (minus 2 * channel
411 * tune time)
412 */
413 for_each_context(priv, ctx) {
414 u16 value;
415
416 switch (ctx->staging.dev_type) {
417 case RXON_DEV_TYPE_P2P:
418 /* no timing constraints */
419 continue;
420 case RXON_DEV_TYPE_ESS:
421 default:
422 /* timing constraints if associated */
423 if (!iwl_is_associated_ctx(ctx))
424 continue;
425 break;
426 case RXON_DEV_TYPE_CP:
427 case RXON_DEV_TYPE_2STA:
428 /*
429 * These seem to always have timers for TBTT
430 * active in uCode even when not associated yet.
431 */
432 break;
433 }
434
435 value = ctx->beacon_int;
436 if (!value)
437 value = IWL_PASSIVE_DWELL_BASE;
438 value = (value * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
439 dwell_time = min(value, dwell_time);
440 }
441
442 return dwell_time;
443 }
444
445 static u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
446 enum ieee80211_band band)
447 {
448 u16 passive = (band == IEEE80211_BAND_2GHZ) ?
449 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
450 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
451
452 return iwl_limit_dwell(priv, passive);
453 }
454
455 static int iwl_get_single_channel_for_scan(struct iwl_priv *priv,
456 struct ieee80211_vif *vif,
457 enum ieee80211_band band,
458 struct iwl_scan_channel *scan_ch)
459 {
460 const struct ieee80211_supported_band *sband;
461 u16 passive_dwell = 0;
462 u16 active_dwell = 0;
463 int added = 0;
464 u16 channel = 0;
465
466 sband = iwl_get_hw_mode(priv, band);
467 if (!sband) {
468 IWL_ERR(priv, "invalid band\n");
469 return added;
470 }
471
472 active_dwell = iwl_get_active_dwell_time(priv, band, 0);
473 passive_dwell = iwl_get_passive_dwell_time(priv, band);
474
475 if (passive_dwell <= active_dwell)
476 passive_dwell = active_dwell + 1;
477
478 channel = iwl_get_single_channel_number(priv, band);
479 if (channel) {
480 scan_ch->channel = cpu_to_le16(channel);
481 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
482 scan_ch->active_dwell = cpu_to_le16(active_dwell);
483 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
484 /* Set txpower levels to defaults */
485 scan_ch->dsp_atten = 110;
486 if (band == IEEE80211_BAND_5GHZ)
487 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
488 else
489 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
490 added++;
491 } else
492 IWL_ERR(priv, "no valid channel found\n");
493 return added;
494 }
495
496 static int iwl_get_channels_for_scan(struct iwl_priv *priv,
497 struct ieee80211_vif *vif,
498 enum ieee80211_band band,
499 u8 is_active, u8 n_probes,
500 struct iwl_scan_channel *scan_ch)
501 {
502 struct ieee80211_channel *chan;
503 const struct ieee80211_supported_band *sband;
504 const struct iwl_channel_info *ch_info;
505 u16 passive_dwell = 0;
506 u16 active_dwell = 0;
507 int added, i;
508 u16 channel;
509
510 sband = iwl_get_hw_mode(priv, band);
511 if (!sband)
512 return 0;
513
514 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
515 passive_dwell = iwl_get_passive_dwell_time(priv, band);
516
517 if (passive_dwell <= active_dwell)
518 passive_dwell = active_dwell + 1;
519
520 for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) {
521 chan = priv->scan_request->channels[i];
522
523 if (chan->band != band)
524 continue;
525
526 channel = chan->hw_value;
527 scan_ch->channel = cpu_to_le16(channel);
528
529 ch_info = iwl_get_channel_info(priv, band, channel);
530 if (!is_channel_valid(ch_info)) {
531 IWL_DEBUG_SCAN(priv,
532 "Channel %d is INVALID for this band.\n",
533 channel);
534 continue;
535 }
536
537 if (!is_active || is_channel_passive(ch_info) ||
538 (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN))
539 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
540 else
541 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
542
543 if (n_probes)
544 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
545
546 scan_ch->active_dwell = cpu_to_le16(active_dwell);
547 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
548
549 /* Set txpower levels to defaults */
550 scan_ch->dsp_atten = 110;
551
552 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
553 * power level:
554 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
555 */
556 if (band == IEEE80211_BAND_5GHZ)
557 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
558 else
559 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
560
561 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n",
562 channel, le32_to_cpu(scan_ch->type),
563 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
564 "ACTIVE" : "PASSIVE",
565 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
566 active_dwell : passive_dwell);
567
568 scan_ch++;
569 added++;
570 }
571
572 IWL_DEBUG_SCAN(priv, "total channels to scan %d\n", added);
573 return added;
574 }
575
576 static int iwlagn_request_scan(struct iwl_priv *priv, struct ieee80211_vif *vif)
577 {
578 struct iwl_host_cmd cmd = {
579 .id = REPLY_SCAN_CMD,
580 .len = { sizeof(struct iwl_scan_cmd), },
581 .flags = CMD_SYNC,
582 };
583 struct iwl_scan_cmd *scan;
584 struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
585 u32 rate_flags = 0;
586 u16 cmd_len = 0;
587 u16 rx_chain = 0;
588 enum ieee80211_band band;
589 u8 n_probes = 0;
590 u8 rx_ant = hw_params(priv).valid_rx_ant;
591 u8 rate;
592 bool is_active = false;
593 int chan_mod;
594 u8 active_chains;
595 u8 scan_tx_antennas = hw_params(priv).valid_tx_ant;
596 int ret;
597
598 lockdep_assert_held(&priv->mutex);
599
600 if (vif)
601 ctx = iwl_rxon_ctx_from_vif(vif);
602
603 if (!priv->scan_cmd) {
604 priv->scan_cmd = kmalloc(sizeof(struct iwl_scan_cmd) +
605 IWL_MAX_SCAN_SIZE, GFP_KERNEL);
606 if (!priv->scan_cmd) {
607 IWL_DEBUG_SCAN(priv,
608 "fail to allocate memory for scan\n");
609 return -ENOMEM;
610 }
611 }
612 scan = priv->scan_cmd;
613 memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE);
614
615 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
616 scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
617
618 if (priv->scan_type != IWL_SCAN_ROC &&
619 iwl_is_any_associated(priv)) {
620 u16 interval = 0;
621 u32 extra;
622 u32 suspend_time = 100;
623 u32 scan_suspend_time = 100;
624
625 IWL_DEBUG_INFO(priv, "Scanning while associated...\n");
626 switch (priv->scan_type) {
627 case IWL_SCAN_ROC:
628 WARN_ON(1);
629 break;
630 case IWL_SCAN_RADIO_RESET:
631 interval = 0;
632 break;
633 case IWL_SCAN_NORMAL:
634 interval = vif->bss_conf.beacon_int;
635 break;
636 }
637
638 scan->suspend_time = 0;
639 scan->max_out_time = cpu_to_le32(200 * 1024);
640 if (!interval)
641 interval = suspend_time;
642
643 extra = (suspend_time / interval) << 22;
644 scan_suspend_time = (extra |
645 ((suspend_time % interval) * 1024));
646 scan->suspend_time = cpu_to_le32(scan_suspend_time);
647 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n",
648 scan_suspend_time, interval);
649 } else if (priv->scan_type == IWL_SCAN_ROC) {
650 scan->suspend_time = 0;
651 scan->max_out_time = 0;
652 scan->quiet_time = 0;
653 scan->quiet_plcp_th = 0;
654 }
655
656 switch (priv->scan_type) {
657 case IWL_SCAN_RADIO_RESET:
658 IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n");
659 break;
660 case IWL_SCAN_NORMAL:
661 if (priv->scan_request->n_ssids) {
662 int i, p = 0;
663 IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
664 for (i = 0; i < priv->scan_request->n_ssids; i++) {
665 /* always does wildcard anyway */
666 if (!priv->scan_request->ssids[i].ssid_len)
667 continue;
668 scan->direct_scan[p].id = WLAN_EID_SSID;
669 scan->direct_scan[p].len =
670 priv->scan_request->ssids[i].ssid_len;
671 memcpy(scan->direct_scan[p].ssid,
672 priv->scan_request->ssids[i].ssid,
673 priv->scan_request->ssids[i].ssid_len);
674 n_probes++;
675 p++;
676 }
677 is_active = true;
678 } else
679 IWL_DEBUG_SCAN(priv, "Start passive scan.\n");
680 break;
681 case IWL_SCAN_ROC:
682 IWL_DEBUG_SCAN(priv, "Start ROC scan.\n");
683 break;
684 }
685
686 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
687 scan->tx_cmd.sta_id = ctx->bcast_sta_id;
688 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
689
690 switch (priv->scan_band) {
691 case IEEE80211_BAND_2GHZ:
692 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
693 chan_mod = le32_to_cpu(
694 priv->contexts[IWL_RXON_CTX_BSS].active.flags &
695 RXON_FLG_CHANNEL_MODE_MSK)
696 >> RXON_FLG_CHANNEL_MODE_POS;
697 if ((priv->scan_request && priv->scan_request->no_cck) ||
698 chan_mod == CHANNEL_MODE_PURE_40) {
699 rate = IWL_RATE_6M_PLCP;
700 } else {
701 rate = IWL_RATE_1M_PLCP;
702 rate_flags = RATE_MCS_CCK_MSK;
703 }
704 /*
705 * Internal scans are passive, so we can indiscriminately set
706 * the BT ignore flag on 2.4 GHz since it applies to TX only.
707 */
708 if (cfg(priv)->bt_params &&
709 cfg(priv)->bt_params->advanced_bt_coexist)
710 scan->tx_cmd.tx_flags |= TX_CMD_FLG_IGNORE_BT;
711 break;
712 case IEEE80211_BAND_5GHZ:
713 rate = IWL_RATE_6M_PLCP;
714 break;
715 default:
716 IWL_WARN(priv, "Invalid scan band\n");
717 return -EIO;
718 }
719
720 /*
721 * If active scanning is requested but a certain channel is
722 * marked passive, we can do active scanning if we detect
723 * transmissions.
724 *
725 * There is an issue with some firmware versions that triggers
726 * a sysassert on a "good CRC threshold" of zero (== disabled),
727 * on a radar channel even though this means that we should NOT
728 * send probes.
729 *
730 * The "good CRC threshold" is the number of frames that we
731 * need to receive during our dwell time on a channel before
732 * sending out probes -- setting this to a huge value will
733 * mean we never reach it, but at the same time work around
734 * the aforementioned issue. Thus use IWL_GOOD_CRC_TH_NEVER
735 * here instead of IWL_GOOD_CRC_TH_DISABLED.
736 *
737 * This was fixed in later versions along with some other
738 * scan changes, and the threshold behaves as a flag in those
739 * versions.
740 */
741 if (priv->new_scan_threshold_behaviour)
742 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
743 IWL_GOOD_CRC_TH_DISABLED;
744 else
745 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
746 IWL_GOOD_CRC_TH_NEVER;
747
748 band = priv->scan_band;
749
750 if (cfg(priv)->scan_rx_antennas[band])
751 rx_ant = cfg(priv)->scan_rx_antennas[band];
752
753 if (band == IEEE80211_BAND_2GHZ &&
754 cfg(priv)->bt_params &&
755 cfg(priv)->bt_params->advanced_bt_coexist) {
756 /* transmit 2.4 GHz probes only on first antenna */
757 scan_tx_antennas = first_antenna(scan_tx_antennas);
758 }
759
760 priv->scan_tx_ant[band] = iwl_toggle_tx_ant(priv,
761 priv->scan_tx_ant[band],
762 scan_tx_antennas);
763 rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]);
764 scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags);
765
766 /* In power save mode use one chain, otherwise use all chains */
767 if (test_bit(STATUS_POWER_PMI, &priv->shrd->status)) {
768 /* rx_ant has been set to all valid chains previously */
769 active_chains = rx_ant &
770 ((u8)(priv->chain_noise_data.active_chains));
771 if (!active_chains)
772 active_chains = rx_ant;
773
774 IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n",
775 priv->chain_noise_data.active_chains);
776
777 rx_ant = first_antenna(active_chains);
778 }
779 if (cfg(priv)->bt_params &&
780 cfg(priv)->bt_params->advanced_bt_coexist &&
781 priv->bt_full_concurrent) {
782 /* operated as 1x1 in full concurrency mode */
783 rx_ant = first_antenna(rx_ant);
784 }
785
786 /* MIMO is not used here, but value is required */
787 rx_chain |=
788 hw_params(priv).valid_rx_ant << RXON_RX_CHAIN_VALID_POS;
789 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS;
790 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS;
791 rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS;
792 scan->rx_chain = cpu_to_le16(rx_chain);
793 switch (priv->scan_type) {
794 case IWL_SCAN_NORMAL:
795 cmd_len = iwl_fill_probe_req(priv,
796 (struct ieee80211_mgmt *)scan->data,
797 vif->addr,
798 priv->scan_request->ie,
799 priv->scan_request->ie_len,
800 IWL_MAX_SCAN_SIZE - sizeof(*scan));
801 break;
802 case IWL_SCAN_RADIO_RESET:
803 case IWL_SCAN_ROC:
804 /* use bcast addr, will not be transmitted but must be valid */
805 cmd_len = iwl_fill_probe_req(priv,
806 (struct ieee80211_mgmt *)scan->data,
807 iwl_bcast_addr, NULL, 0,
808 IWL_MAX_SCAN_SIZE - sizeof(*scan));
809 break;
810 default:
811 BUG();
812 }
813 scan->tx_cmd.len = cpu_to_le16(cmd_len);
814
815 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
816 RXON_FILTER_BCON_AWARE_MSK);
817
818 switch (priv->scan_type) {
819 case IWL_SCAN_RADIO_RESET:
820 scan->channel_count =
821 iwl_get_single_channel_for_scan(priv, vif, band,
822 (void *)&scan->data[cmd_len]);
823 break;
824 case IWL_SCAN_NORMAL:
825 scan->channel_count =
826 iwl_get_channels_for_scan(priv, vif, band,
827 is_active, n_probes,
828 (void *)&scan->data[cmd_len]);
829 break;
830 case IWL_SCAN_ROC: {
831 struct iwl_scan_channel *scan_ch;
832 int n_chan, i;
833 u16 dwell;
834
835 dwell = iwl_limit_dwell(priv, priv->hw_roc_duration);
836 n_chan = DIV_ROUND_UP(priv->hw_roc_duration, dwell);
837
838 scan->channel_count = n_chan;
839
840 scan_ch = (void *)&scan->data[cmd_len];
841
842 for (i = 0; i < n_chan; i++) {
843 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
844 scan_ch->channel =
845 cpu_to_le16(priv->hw_roc_channel->hw_value);
846
847 if (i == n_chan - 1)
848 dwell = priv->hw_roc_duration - i * dwell;
849
850 scan_ch->active_dwell =
851 scan_ch->passive_dwell = cpu_to_le16(dwell);
852
853 /* Set txpower levels to defaults */
854 scan_ch->dsp_atten = 110;
855
856 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
857 * power level:
858 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
859 */
860 if (priv->hw_roc_channel->band == IEEE80211_BAND_5GHZ)
861 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
862 else
863 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
864
865 scan_ch++;
866 }
867 }
868
869 break;
870 }
871
872 if (scan->channel_count == 0) {
873 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
874 return -EIO;
875 }
876
877 cmd.len[0] += le16_to_cpu(scan->tx_cmd.len) +
878 scan->channel_count * sizeof(struct iwl_scan_channel);
879 cmd.data[0] = scan;
880 cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
881 scan->len = cpu_to_le16(cmd.len[0]);
882
883 /* set scan bit here for PAN params */
884 set_bit(STATUS_SCAN_HW, &priv->shrd->status);
885
886 ret = iwlagn_set_pan_params(priv);
887 if (ret)
888 return ret;
889
890 ret = iwl_dvm_send_cmd(priv, &cmd);
891 if (ret) {
892 clear_bit(STATUS_SCAN_HW, &priv->shrd->status);
893 iwlagn_set_pan_params(priv);
894 }
895
896 return ret;
897 }
898
899 void iwl_init_scan_params(struct iwl_priv *priv)
900 {
901 u8 ant_idx = fls(hw_params(priv).valid_tx_ant) - 1;
902 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
903 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
904 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
905 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
906 }
907
908 int __must_check iwl_scan_initiate(struct iwl_priv *priv,
909 struct ieee80211_vif *vif,
910 enum iwl_scan_type scan_type,
911 enum ieee80211_band band)
912 {
913 int ret;
914
915 lockdep_assert_held(&priv->mutex);
916
917 cancel_delayed_work(&priv->scan_check);
918
919 if (!iwl_is_ready_rf(priv->shrd)) {
920 IWL_WARN(priv, "Request scan called when driver not ready.\n");
921 return -EIO;
922 }
923
924 if (test_bit(STATUS_SCAN_HW, &priv->shrd->status)) {
925 IWL_DEBUG_SCAN(priv,
926 "Multiple concurrent scan requests in parallel.\n");
927 return -EBUSY;
928 }
929
930 if (test_bit(STATUS_SCAN_ABORTING, &priv->shrd->status)) {
931 IWL_DEBUG_SCAN(priv, "Scan request while abort pending.\n");
932 return -EBUSY;
933 }
934
935 IWL_DEBUG_SCAN(priv, "Starting %sscan...\n",
936 scan_type == IWL_SCAN_NORMAL ? "" :
937 scan_type == IWL_SCAN_ROC ? "remain-on-channel " :
938 "internal short ");
939
940 set_bit(STATUS_SCANNING, &priv->shrd->status);
941 priv->scan_type = scan_type;
942 priv->scan_start = jiffies;
943 priv->scan_band = band;
944
945 ret = iwlagn_request_scan(priv, vif);
946 if (ret) {
947 clear_bit(STATUS_SCANNING, &priv->shrd->status);
948 priv->scan_type = IWL_SCAN_NORMAL;
949 return ret;
950 }
951
952 queue_delayed_work(priv->workqueue, &priv->scan_check,
953 IWL_SCAN_CHECK_WATCHDOG);
954
955 return 0;
956 }
957
958
959 /*
960 * internal short scan, this function should only been called while associated.
961 * It will reset and tune the radio to prevent possible RF related problem
962 */
963 void iwl_internal_short_hw_scan(struct iwl_priv *priv)
964 {
965 queue_work(priv->workqueue, &priv->start_internal_scan);
966 }
967
968 static void iwl_bg_start_internal_scan(struct work_struct *work)
969 {
970 struct iwl_priv *priv =
971 container_of(work, struct iwl_priv, start_internal_scan);
972
973 IWL_DEBUG_SCAN(priv, "Start internal scan\n");
974
975 mutex_lock(&priv->mutex);
976
977 if (priv->scan_type == IWL_SCAN_RADIO_RESET) {
978 IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n");
979 goto unlock;
980 }
981
982 if (test_bit(STATUS_SCANNING, &priv->shrd->status)) {
983 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
984 goto unlock;
985 }
986
987 if (iwl_scan_initiate(priv, NULL, IWL_SCAN_RADIO_RESET, priv->band))
988 IWL_DEBUG_SCAN(priv, "failed to start internal short scan\n");
989 unlock:
990 mutex_unlock(&priv->mutex);
991 }
992
993 static void iwl_bg_scan_check(struct work_struct *data)
994 {
995 struct iwl_priv *priv =
996 container_of(data, struct iwl_priv, scan_check.work);
997
998 IWL_DEBUG_SCAN(priv, "Scan check work\n");
999
1000 /* Since we are here firmware does not finish scan and
1001 * most likely is in bad shape, so we don't bother to
1002 * send abort command, just force scan complete to mac80211 */
1003 mutex_lock(&priv->mutex);
1004 iwl_force_scan_end(priv);
1005 mutex_unlock(&priv->mutex);
1006 }
1007
1008 /**
1009 * iwl_fill_probe_req - fill in all required fields and IE for probe request
1010 */
1011
1012 u16 iwl_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame,
1013 const u8 *ta, const u8 *ies, int ie_len, int left)
1014 {
1015 int len = 0;
1016 u8 *pos = NULL;
1017
1018 /* Make sure there is enough space for the probe request,
1019 * two mandatory IEs and the data */
1020 left -= 24;
1021 if (left < 0)
1022 return 0;
1023
1024 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
1025 memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
1026 memcpy(frame->sa, ta, ETH_ALEN);
1027 memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
1028 frame->seq_ctrl = 0;
1029
1030 len += 24;
1031
1032 /* ...next IE... */
1033 pos = &frame->u.probe_req.variable[0];
1034
1035 /* fill in our indirect SSID IE */
1036 left -= 2;
1037 if (left < 0)
1038 return 0;
1039 *pos++ = WLAN_EID_SSID;
1040 *pos++ = 0;
1041
1042 len += 2;
1043
1044 if (WARN_ON(left < ie_len))
1045 return len;
1046
1047 if (ies && ie_len) {
1048 memcpy(pos, ies, ie_len);
1049 len += ie_len;
1050 }
1051
1052 return (u16)len;
1053 }
1054
1055 static void iwl_bg_abort_scan(struct work_struct *work)
1056 {
1057 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
1058
1059 IWL_DEBUG_SCAN(priv, "Abort scan work\n");
1060
1061 /* We keep scan_check work queued in case when firmware will not
1062 * report back scan completed notification */
1063 mutex_lock(&priv->mutex);
1064 iwl_scan_cancel_timeout(priv, 200);
1065 mutex_unlock(&priv->mutex);
1066 }
1067
1068 static void iwl_bg_scan_completed(struct work_struct *work)
1069 {
1070 struct iwl_priv *priv =
1071 container_of(work, struct iwl_priv, scan_completed);
1072
1073 mutex_lock(&priv->mutex);
1074 iwl_process_scan_complete(priv);
1075 mutex_unlock(&priv->mutex);
1076 }
1077
1078 void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
1079 {
1080 INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
1081 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
1082 INIT_WORK(&priv->start_internal_scan, iwl_bg_start_internal_scan);
1083 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
1084 }
1085
1086 void iwl_cancel_scan_deferred_work(struct iwl_priv *priv)
1087 {
1088 cancel_work_sync(&priv->start_internal_scan);
1089 cancel_work_sync(&priv->abort_scan);
1090 cancel_work_sync(&priv->scan_completed);
1091
1092 if (cancel_delayed_work_sync(&priv->scan_check)) {
1093 mutex_lock(&priv->mutex);
1094 iwl_force_scan_end(priv);
1095 mutex_unlock(&priv->mutex);
1096 }
1097 }
Linux kernel - Deliverables
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