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28#include <linux/slab.h>
29#include <linux/types.h>
30#include <linux/etherdevice.h>
31#include <net/mac80211.h>
32
33#include "dev.h"
34#include "agn.h"
35
36
37
38
39#define IWL_ACTIVE_DWELL_TIME_24 (30)
40#define IWL_ACTIVE_DWELL_TIME_52 (20)
41
42#define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3)
43#define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2)
44
45
46
47
48#define IWL_PASSIVE_DWELL_TIME_24 (20)
49#define IWL_PASSIVE_DWELL_TIME_52 (10)
50#define IWL_PASSIVE_DWELL_BASE (100)
51#define IWL_CHANNEL_TUNE_TIME 5
52#define MAX_SCAN_CHANNEL 50
53
54
55#define IWL_RADIO_RESET_DWELL_TIME 5
56
57static int iwl_send_scan_abort(struct iwl_priv *priv)
58{
59 int ret;
60 struct iwl_host_cmd cmd = {
61 .id = REPLY_SCAN_ABORT_CMD,
62 .flags = CMD_WANT_SKB,
63 };
64 __le32 *status;
65
66
67
68
69 if (!test_bit(STATUS_READY, &priv->status) ||
70 !test_bit(STATUS_SCAN_HW, &priv->status) ||
71 test_bit(STATUS_FW_ERROR, &priv->status))
72 return -EIO;
73
74 ret = iwl_dvm_send_cmd(priv, &cmd);
75 if (ret)
76 return ret;
77
78 status = (void *)cmd.resp_pkt->data;
79 if (*status != CAN_ABORT_STATUS) {
80
81
82
83
84
85
86 IWL_DEBUG_SCAN(priv, "SCAN_ABORT ret %d.\n",
87 le32_to_cpu(*status));
88 ret = -EIO;
89 }
90
91 iwl_free_resp(&cmd);
92 return ret;
93}
94
95static void iwl_complete_scan(struct iwl_priv *priv, bool aborted)
96{
97 struct cfg80211_scan_info info = {
98 .aborted = aborted,
99 };
100
101
102 if (priv->scan_request) {
103 IWL_DEBUG_SCAN(priv, "Complete scan in mac80211\n");
104 ieee80211_scan_completed(priv->hw, &info);
105 }
106
107 priv->scan_type = IWL_SCAN_NORMAL;
108 priv->scan_vif = NULL;
109 priv->scan_request = NULL;
110}
111
112static void iwl_process_scan_complete(struct iwl_priv *priv)
113{
114 bool aborted;
115
116 lockdep_assert_held(&priv->mutex);
117
118 if (!test_and_clear_bit(STATUS_SCAN_COMPLETE, &priv->status))
119 return;
120
121 IWL_DEBUG_SCAN(priv, "Completed scan.\n");
122
123 cancel_delayed_work(&priv->scan_check);
124
125 aborted = test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->status);
126 if (aborted)
127 IWL_DEBUG_SCAN(priv, "Aborted scan completed.\n");
128
129 if (!test_and_clear_bit(STATUS_SCANNING, &priv->status)) {
130 IWL_DEBUG_SCAN(priv, "Scan already completed.\n");
131 goto out_settings;
132 }
133
134 if (priv->scan_type != IWL_SCAN_NORMAL && !aborted) {
135 int err;
136
137
138 if (priv->scan_request == NULL)
139 goto out_complete;
140
141
142 err = iwl_scan_initiate(priv, priv->scan_vif, IWL_SCAN_NORMAL,
143 priv->scan_request->channels[0]->band);
144 if (err) {
145 IWL_DEBUG_SCAN(priv,
146 "failed to initiate pending scan: %d\n", err);
147 aborted = true;
148 goto out_complete;
149 }
150
151 return;
152 }
153
154out_complete:
155 iwl_complete_scan(priv, aborted);
156
157out_settings:
158
159 if (!iwl_is_ready_rf(priv))
160 return;
161
162 iwlagn_post_scan(priv);
163}
164
165void iwl_force_scan_end(struct iwl_priv *priv)
166{
167 lockdep_assert_held(&priv->mutex);
168
169 if (!test_bit(STATUS_SCANNING, &priv->status)) {
170 IWL_DEBUG_SCAN(priv, "Forcing scan end while not scanning\n");
171 return;
172 }
173
174 IWL_DEBUG_SCAN(priv, "Forcing scan end\n");
175 clear_bit(STATUS_SCANNING, &priv->status);
176 clear_bit(STATUS_SCAN_HW, &priv->status);
177 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
178 clear_bit(STATUS_SCAN_COMPLETE, &priv->status);
179 iwl_complete_scan(priv, true);
180}
181
182static void iwl_do_scan_abort(struct iwl_priv *priv)
183{
184 int ret;
185
186 lockdep_assert_held(&priv->mutex);
187
188 if (!test_bit(STATUS_SCANNING, &priv->status)) {
189 IWL_DEBUG_SCAN(priv, "Not performing scan to abort\n");
190 return;
191 }
192
193 if (test_and_set_bit(STATUS_SCAN_ABORTING, &priv->status)) {
194 IWL_DEBUG_SCAN(priv, "Scan abort in progress\n");
195 return;
196 }
197
198 ret = iwl_send_scan_abort(priv);
199 if (ret) {
200 IWL_DEBUG_SCAN(priv, "Send scan abort failed %d\n", ret);
201 iwl_force_scan_end(priv);
202 } else
203 IWL_DEBUG_SCAN(priv, "Successfully send scan abort\n");
204}
205
206
207
208
209int iwl_scan_cancel(struct iwl_priv *priv)
210{
211 IWL_DEBUG_SCAN(priv, "Queuing abort scan\n");
212 queue_work(priv->workqueue, &priv->abort_scan);
213 return 0;
214}
215
216
217
218
219
220
221void iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
222{
223 unsigned long timeout = jiffies + msecs_to_jiffies(ms);
224
225 lockdep_assert_held(&priv->mutex);
226
227 IWL_DEBUG_SCAN(priv, "Scan cancel timeout\n");
228
229 iwl_do_scan_abort(priv);
230
231 while (time_before_eq(jiffies, timeout)) {
232 if (!test_bit(STATUS_SCAN_HW, &priv->status))
233 goto finished;
234 msleep(20);
235 }
236
237 return;
238
239 finished:
240
241
242
243
244
245
246
247
248
249
250 iwl_process_scan_complete(priv);
251}
252
253
254static void iwl_rx_reply_scan(struct iwl_priv *priv,
255 struct iwl_rx_cmd_buffer *rxb)
256{
257#ifdef CONFIG_IWLWIFI_DEBUG
258 struct iwl_rx_packet *pkt = rxb_addr(rxb);
259 struct iwl_scanreq_notification *notif = (void *)pkt->data;
260
261 IWL_DEBUG_SCAN(priv, "Scan request status = 0x%x\n", notif->status);
262#endif
263}
264
265
266static void iwl_rx_scan_start_notif(struct iwl_priv *priv,
267 struct iwl_rx_cmd_buffer *rxb)
268{
269 struct iwl_rx_packet *pkt = rxb_addr(rxb);
270 struct iwl_scanstart_notification *notif = (void *)pkt->data;
271
272 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
273 IWL_DEBUG_SCAN(priv, "Scan start: "
274 "%d [802.11%s] "
275 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
276 notif->channel,
277 notif->band ? "bg" : "a",
278 le32_to_cpu(notif->tsf_high),
279 le32_to_cpu(notif->tsf_low),
280 notif->status, notif->beacon_timer);
281}
282
283
284static void iwl_rx_scan_results_notif(struct iwl_priv *priv,
285 struct iwl_rx_cmd_buffer *rxb)
286{
287#ifdef CONFIG_IWLWIFI_DEBUG
288 struct iwl_rx_packet *pkt = rxb_addr(rxb);
289 struct iwl_scanresults_notification *notif = (void *)pkt->data;
290
291 IWL_DEBUG_SCAN(priv, "Scan ch.res: "
292 "%d [802.11%s] "
293 "probe status: %u:%u "
294 "(TSF: 0x%08X:%08X) - %d "
295 "elapsed=%lu usec\n",
296 notif->channel,
297 notif->band ? "bg" : "a",
298 notif->probe_status, notif->num_probe_not_sent,
299 le32_to_cpu(notif->tsf_high),
300 le32_to_cpu(notif->tsf_low),
301 le32_to_cpu(notif->statistics[0]),
302 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf);
303#endif
304}
305
306
307static void iwl_rx_scan_complete_notif(struct iwl_priv *priv,
308 struct iwl_rx_cmd_buffer *rxb)
309{
310 struct iwl_rx_packet *pkt = rxb_addr(rxb);
311 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->data;
312
313 IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
314 scan_notif->scanned_channels,
315 scan_notif->tsf_low,
316 scan_notif->tsf_high, scan_notif->status);
317
318 IWL_DEBUG_SCAN(priv, "Scan on %sGHz took %dms\n",
319 (priv->scan_band == NL80211_BAND_2GHZ) ? "2.4" : "5.2",
320 jiffies_to_msecs(jiffies - priv->scan_start));
321
322
323
324
325
326
327
328
329
330 set_bit(STATUS_SCAN_COMPLETE, &priv->status);
331 clear_bit(STATUS_SCAN_HW, &priv->status);
332 queue_work(priv->workqueue, &priv->scan_completed);
333
334 if (priv->iw_mode != NL80211_IFTYPE_ADHOC &&
335 iwl_advanced_bt_coexist(priv) &&
336 priv->bt_status != scan_notif->bt_status) {
337 if (scan_notif->bt_status) {
338
339 if (!priv->bt_ch_announce)
340 priv->bt_traffic_load =
341 IWL_BT_COEX_TRAFFIC_LOAD_HIGH;
342
343
344
345
346 } else {
347
348 priv->bt_traffic_load =
349 IWL_BT_COEX_TRAFFIC_LOAD_NONE;
350 }
351 priv->bt_status = scan_notif->bt_status;
352 queue_work(priv->workqueue,
353 &priv->bt_traffic_change_work);
354 }
355}
356
357void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
358{
359
360 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
361 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
362 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
363 iwl_rx_scan_results_notif;
364 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
365 iwl_rx_scan_complete_notif;
366}
367
368static u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
369 enum nl80211_band band, u8 n_probes)
370{
371 if (band == NL80211_BAND_5GHZ)
372 return IWL_ACTIVE_DWELL_TIME_52 +
373 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
374 else
375 return IWL_ACTIVE_DWELL_TIME_24 +
376 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
377}
378
379static u16 iwl_limit_dwell(struct iwl_priv *priv, u16 dwell_time)
380{
381 struct iwl_rxon_context *ctx;
382 int limits[NUM_IWL_RXON_CTX] = {};
383 int n_active = 0;
384 u16 limit;
385
386 BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
387
388
389
390
391
392
393
394
395
396 for_each_context(priv, ctx) {
397 switch (ctx->staging.dev_type) {
398 case RXON_DEV_TYPE_P2P:
399
400 continue;
401 case RXON_DEV_TYPE_ESS:
402 default:
403
404 if (!iwl_is_associated_ctx(ctx))
405 continue;
406 break;
407 case RXON_DEV_TYPE_CP:
408 case RXON_DEV_TYPE_2STA:
409
410
411
412
413 break;
414 }
415
416 limits[n_active++] = ctx->beacon_int ?: IWL_PASSIVE_DWELL_BASE;
417 }
418
419 switch (n_active) {
420 case 0:
421 return dwell_time;
422 case 2:
423 limit = (limits[1] * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
424 limit /= 2;
425 dwell_time = min(limit, dwell_time);
426
427 case 1:
428 limit = (limits[0] * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
429 limit /= n_active;
430 return min(limit, dwell_time);
431 default:
432 WARN_ON_ONCE(1);
433 return dwell_time;
434 }
435}
436
437static u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
438 enum nl80211_band band)
439{
440 u16 passive = (band == NL80211_BAND_2GHZ) ?
441 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
442 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
443
444 return iwl_limit_dwell(priv, passive);
445}
446
447
448static u8 iwl_get_single_channel_number(struct iwl_priv *priv,
449 enum nl80211_band band)
450{
451 struct ieee80211_supported_band *sband = priv->hw->wiphy->bands[band];
452 struct iwl_rxon_context *ctx;
453 int i;
454
455 for (i = 0; i < sband->n_channels; i++) {
456 bool busy = false;
457
458 for_each_context(priv, ctx) {
459 busy = sband->channels[i].hw_value ==
460 le16_to_cpu(ctx->staging.channel);
461 if (busy)
462 break;
463 }
464
465 if (busy)
466 continue;
467
468 if (!(sband->channels[i].flags & IEEE80211_CHAN_DISABLED))
469 return sband->channels[i].hw_value;
470 }
471
472 return 0;
473}
474
475static int iwl_get_channel_for_reset_scan(struct iwl_priv *priv,
476 struct ieee80211_vif *vif,
477 enum nl80211_band band,
478 struct iwl_scan_channel *scan_ch)
479{
480 const struct ieee80211_supported_band *sband;
481 u16 channel;
482
483 sband = iwl_get_hw_mode(priv, band);
484 if (!sband) {
485 IWL_ERR(priv, "invalid band\n");
486 return 0;
487 }
488
489 channel = iwl_get_single_channel_number(priv, band);
490 if (channel) {
491 scan_ch->channel = cpu_to_le16(channel);
492 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
493 scan_ch->active_dwell =
494 cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME);
495 scan_ch->passive_dwell =
496 cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME);
497
498 scan_ch->dsp_atten = 110;
499 if (band == NL80211_BAND_5GHZ)
500 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
501 else
502 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
503 return 1;
504 }
505
506 IWL_ERR(priv, "no valid channel found\n");
507 return 0;
508}
509
510static int iwl_get_channels_for_scan(struct iwl_priv *priv,
511 struct ieee80211_vif *vif,
512 enum nl80211_band band,
513 u8 is_active, u8 n_probes,
514 struct iwl_scan_channel *scan_ch)
515{
516 struct ieee80211_channel *chan;
517 const struct ieee80211_supported_band *sband;
518 u16 passive_dwell = 0;
519 u16 active_dwell = 0;
520 int added, i;
521 u16 channel;
522
523 sband = iwl_get_hw_mode(priv, band);
524 if (!sband)
525 return 0;
526
527 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
528 passive_dwell = iwl_get_passive_dwell_time(priv, band);
529
530 if (passive_dwell <= active_dwell)
531 passive_dwell = active_dwell + 1;
532
533 for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) {
534 chan = priv->scan_request->channels[i];
535
536 if (chan->band != band)
537 continue;
538
539 channel = chan->hw_value;
540 scan_ch->channel = cpu_to_le16(channel);
541
542 if (!is_active || (chan->flags & IEEE80211_CHAN_NO_IR))
543 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
544 else
545 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
546
547 if (n_probes)
548 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
549
550 scan_ch->active_dwell = cpu_to_le16(active_dwell);
551 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
552
553
554 scan_ch->dsp_atten = 110;
555
556
557
558
559
560 if (band == NL80211_BAND_5GHZ)
561 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
562 else
563 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
564
565 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n",
566 channel, le32_to_cpu(scan_ch->type),
567 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
568 "ACTIVE" : "PASSIVE",
569 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
570 active_dwell : passive_dwell);
571
572 scan_ch++;
573 added++;
574 }
575
576 IWL_DEBUG_SCAN(priv, "total channels to scan %d\n", added);
577 return added;
578}
579
580
581
582
583
584static u16 iwl_fill_probe_req(struct ieee80211_mgmt *frame, const u8 *ta,
585 const u8 *ies, int ie_len, const u8 *ssid,
586 u8 ssid_len, int left)
587{
588 int len = 0;
589 u8 *pos = NULL;
590
591
592
593 left -= 24;
594 if (left < 0)
595 return 0;
596
597 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
598 eth_broadcast_addr(frame->da);
599 memcpy(frame->sa, ta, ETH_ALEN);
600 eth_broadcast_addr(frame->bssid);
601 frame->seq_ctrl = 0;
602
603 len += 24;
604
605
606 pos = &frame->u.probe_req.variable[0];
607
608
609 left -= ssid_len + 2;
610 if (left < 0)
611 return 0;
612 *pos++ = WLAN_EID_SSID;
613 *pos++ = ssid_len;
614 if (ssid && ssid_len) {
615 memcpy(pos, ssid, ssid_len);
616 pos += ssid_len;
617 }
618
619 len += ssid_len + 2;
620
621 if (WARN_ON(left < ie_len))
622 return len;
623
624 if (ies && ie_len) {
625 memcpy(pos, ies, ie_len);
626 len += ie_len;
627 }
628
629 return (u16)len;
630}
631
632static int iwlagn_request_scan(struct iwl_priv *priv, struct ieee80211_vif *vif)
633{
634 struct iwl_host_cmd cmd = {
635 .id = REPLY_SCAN_CMD,
636 .len = { sizeof(struct iwl_scan_cmd), },
637 };
638 struct iwl_scan_cmd *scan;
639 struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
640 u32 rate_flags = 0;
641 u16 cmd_len = 0;
642 u16 rx_chain = 0;
643 enum nl80211_band band;
644 u8 n_probes = 0;
645 u8 rx_ant = priv->nvm_data->valid_rx_ant;
646 u8 rate;
647 bool is_active = false;
648 int chan_mod;
649 u8 active_chains;
650 u8 scan_tx_antennas = priv->nvm_data->valid_tx_ant;
651 int ret;
652 int scan_cmd_size = sizeof(struct iwl_scan_cmd) +
653 MAX_SCAN_CHANNEL * sizeof(struct iwl_scan_channel) +
654 priv->fw->ucode_capa.max_probe_length;
655 const u8 *ssid = NULL;
656 u8 ssid_len = 0;
657
658 if (WARN_ON(priv->scan_type == IWL_SCAN_NORMAL &&
659 (!priv->scan_request ||
660 priv->scan_request->n_channels > MAX_SCAN_CHANNEL)))
661 return -EINVAL;
662
663 lockdep_assert_held(&priv->mutex);
664
665 if (vif)
666 ctx = iwl_rxon_ctx_from_vif(vif);
667
668 if (!priv->scan_cmd) {
669 priv->scan_cmd = kmalloc(scan_cmd_size, GFP_KERNEL);
670 if (!priv->scan_cmd) {
671 IWL_DEBUG_SCAN(priv,
672 "fail to allocate memory for scan\n");
673 return -ENOMEM;
674 }
675 }
676 scan = priv->scan_cmd;
677 memset(scan, 0, scan_cmd_size);
678
679 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
680 scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
681
682 if (iwl_is_any_associated(priv)) {
683 u16 interval = 0;
684 u32 extra;
685 u32 suspend_time = 100;
686 u32 scan_suspend_time = 100;
687
688 IWL_DEBUG_INFO(priv, "Scanning while associated...\n");
689 switch (priv->scan_type) {
690 case IWL_SCAN_RADIO_RESET:
691 interval = 0;
692 break;
693 case IWL_SCAN_NORMAL:
694 interval = vif->bss_conf.beacon_int;
695 break;
696 }
697
698 scan->suspend_time = 0;
699 scan->max_out_time = cpu_to_le32(200 * 1024);
700 if (!interval)
701 interval = suspend_time;
702
703 extra = (suspend_time / interval) << 22;
704 scan_suspend_time = (extra |
705 ((suspend_time % interval) * 1024));
706 scan->suspend_time = cpu_to_le32(scan_suspend_time);
707 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n",
708 scan_suspend_time, interval);
709 }
710
711 switch (priv->scan_type) {
712 case IWL_SCAN_RADIO_RESET:
713 IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n");
714
715
716
717
718
719 scan->quiet_time = cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME);
720 break;
721 case IWL_SCAN_NORMAL:
722 if (priv->scan_request->n_ssids) {
723 int i, p = 0;
724 IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
725
726
727
728
729 ssid_len = priv->scan_request->ssids[0].ssid_len;
730 ssid = priv->scan_request->ssids[0].ssid;
731
732
733
734
735
736 for (i = priv->scan_request->n_ssids - 1; i >= 1; i--) {
737 scan->direct_scan[p].id = WLAN_EID_SSID;
738 scan->direct_scan[p].len =
739 priv->scan_request->ssids[i].ssid_len;
740 memcpy(scan->direct_scan[p].ssid,
741 priv->scan_request->ssids[i].ssid,
742 priv->scan_request->ssids[i].ssid_len);
743 n_probes++;
744 p++;
745 }
746 is_active = true;
747 } else
748 IWL_DEBUG_SCAN(priv, "Start passive scan.\n");
749 break;
750 }
751
752 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
753 scan->tx_cmd.sta_id = ctx->bcast_sta_id;
754 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
755
756 switch (priv->scan_band) {
757 case NL80211_BAND_2GHZ:
758 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
759 chan_mod = le32_to_cpu(
760 priv->contexts[IWL_RXON_CTX_BSS].active.flags &
761 RXON_FLG_CHANNEL_MODE_MSK)
762 >> RXON_FLG_CHANNEL_MODE_POS;
763 if ((priv->scan_request && priv->scan_request->no_cck) ||
764 chan_mod == CHANNEL_MODE_PURE_40) {
765 rate = IWL_RATE_6M_PLCP;
766 } else {
767 rate = IWL_RATE_1M_PLCP;
768 rate_flags = RATE_MCS_CCK_MSK;
769 }
770
771
772
773
774 if (priv->lib->bt_params &&
775 priv->lib->bt_params->advanced_bt_coexist)
776 scan->tx_cmd.tx_flags |= TX_CMD_FLG_IGNORE_BT;
777 break;
778 case NL80211_BAND_5GHZ:
779 rate = IWL_RATE_6M_PLCP;
780 break;
781 default:
782 IWL_WARN(priv, "Invalid scan band\n");
783 return -EIO;
784 }
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807 if (priv->new_scan_threshold_behaviour)
808 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
809 IWL_GOOD_CRC_TH_DISABLED;
810 else
811 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
812 IWL_GOOD_CRC_TH_NEVER;
813
814 band = priv->scan_band;
815
816 if (band == NL80211_BAND_2GHZ &&
817 priv->lib->bt_params &&
818 priv->lib->bt_params->advanced_bt_coexist) {
819
820 scan_tx_antennas = first_antenna(scan_tx_antennas);
821 }
822
823 priv->scan_tx_ant[band] = iwl_toggle_tx_ant(priv,
824 priv->scan_tx_ant[band],
825 scan_tx_antennas);
826 rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]);
827 scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags);
828
829
830
831
832
833 if (test_bit(STATUS_POWER_PMI, &priv->status) &&
834 !(priv->hw->conf.flags & IEEE80211_CONF_IDLE)) {
835
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 if (priv->lib->bt_params &&
847 priv->lib->bt_params->advanced_bt_coexist &&
848 priv->bt_full_concurrent) {
849
850 rx_ant = first_antenna(rx_ant);
851 }
852
853
854 rx_chain |=
855 priv->nvm_data->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 switch (priv->scan_type) {
861 case IWL_SCAN_NORMAL:
862 cmd_len = iwl_fill_probe_req(
863 (struct ieee80211_mgmt *)scan->data,
864 vif->addr,
865 priv->scan_request->ie,
866 priv->scan_request->ie_len,
867 ssid, ssid_len,
868 scan_cmd_size - sizeof(*scan));
869 break;
870 case IWL_SCAN_RADIO_RESET:
871
872 cmd_len = iwl_fill_probe_req(
873 (struct ieee80211_mgmt *)scan->data,
874 iwl_bcast_addr, NULL, 0,
875 NULL, 0,
876 scan_cmd_size - sizeof(*scan));
877 break;
878 default:
879 BUG();
880 }
881 scan->tx_cmd.len = cpu_to_le16(cmd_len);
882
883 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
884 RXON_FILTER_BCON_AWARE_MSK);
885
886 switch (priv->scan_type) {
887 case IWL_SCAN_RADIO_RESET:
888 scan->channel_count =
889 iwl_get_channel_for_reset_scan(priv, vif, band,
890 (void *)&scan->data[cmd_len]);
891 break;
892 case IWL_SCAN_NORMAL:
893 scan->channel_count =
894 iwl_get_channels_for_scan(priv, vif, band,
895 is_active, n_probes,
896 (void *)&scan->data[cmd_len]);
897 break;
898 }
899
900 if (scan->channel_count == 0) {
901 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
902 return -EIO;
903 }
904
905 cmd.len[0] += le16_to_cpu(scan->tx_cmd.len) +
906 scan->channel_count * sizeof(struct iwl_scan_channel);
907 cmd.data[0] = scan;
908 cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
909 scan->len = cpu_to_le16(cmd.len[0]);
910
911
912 set_bit(STATUS_SCAN_HW, &priv->status);
913
914 ret = iwlagn_set_pan_params(priv);
915 if (ret) {
916 clear_bit(STATUS_SCAN_HW, &priv->status);
917 return ret;
918 }
919
920 ret = iwl_dvm_send_cmd(priv, &cmd);
921 if (ret) {
922 clear_bit(STATUS_SCAN_HW, &priv->status);
923 iwlagn_set_pan_params(priv);
924 }
925
926 return ret;
927}
928
929void iwl_init_scan_params(struct iwl_priv *priv)
930{
931 u8 ant_idx = fls(priv->nvm_data->valid_tx_ant) - 1;
932 if (!priv->scan_tx_ant[NL80211_BAND_5GHZ])
933 priv->scan_tx_ant[NL80211_BAND_5GHZ] = ant_idx;
934 if (!priv->scan_tx_ant[NL80211_BAND_2GHZ])
935 priv->scan_tx_ant[NL80211_BAND_2GHZ] = ant_idx;
936}
937
938int __must_check iwl_scan_initiate(struct iwl_priv *priv,
939 struct ieee80211_vif *vif,
940 enum iwl_scan_type scan_type,
941 enum nl80211_band band)
942{
943 int ret;
944
945 lockdep_assert_held(&priv->mutex);
946
947 cancel_delayed_work(&priv->scan_check);
948
949 if (!iwl_is_ready_rf(priv)) {
950 IWL_WARN(priv, "Request scan called when driver not ready.\n");
951 return -EIO;
952 }
953
954 if (test_bit(STATUS_SCAN_HW, &priv->status)) {
955 IWL_DEBUG_SCAN(priv,
956 "Multiple concurrent scan requests in parallel.\n");
957 return -EBUSY;
958 }
959
960 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
961 IWL_DEBUG_SCAN(priv, "Scan request while abort pending.\n");
962 return -EBUSY;
963 }
964
965 IWL_DEBUG_SCAN(priv, "Starting %sscan...\n",
966 scan_type == IWL_SCAN_NORMAL ? "" :
967 "internal short ");
968
969 set_bit(STATUS_SCANNING, &priv->status);
970 priv->scan_type = scan_type;
971 priv->scan_start = jiffies;
972 priv->scan_band = band;
973
974 ret = iwlagn_request_scan(priv, vif);
975 if (ret) {
976 clear_bit(STATUS_SCANNING, &priv->status);
977 priv->scan_type = IWL_SCAN_NORMAL;
978 return ret;
979 }
980
981 queue_delayed_work(priv->workqueue, &priv->scan_check,
982 IWL_SCAN_CHECK_WATCHDOG);
983
984 return 0;
985}
986
987
988
989
990
991
992void iwl_internal_short_hw_scan(struct iwl_priv *priv)
993{
994 queue_work(priv->workqueue, &priv->start_internal_scan);
995}
996
997static void iwl_bg_start_internal_scan(struct work_struct *work)
998{
999 struct iwl_priv *priv =
1000 container_of(work, struct iwl_priv, start_internal_scan);
1001
1002 IWL_DEBUG_SCAN(priv, "Start internal scan\n");
1003
1004 mutex_lock(&priv->mutex);
1005
1006 if (priv->scan_type == IWL_SCAN_RADIO_RESET) {
1007 IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n");
1008 goto unlock;
1009 }
1010
1011 if (test_bit(STATUS_SCANNING, &priv->status)) {
1012 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
1013 goto unlock;
1014 }
1015
1016 if (iwl_scan_initiate(priv, NULL, IWL_SCAN_RADIO_RESET, priv->band))
1017 IWL_DEBUG_SCAN(priv, "failed to start internal short scan\n");
1018 unlock:
1019 mutex_unlock(&priv->mutex);
1020}
1021
1022static void iwl_bg_scan_check(struct work_struct *data)
1023{
1024 struct iwl_priv *priv =
1025 container_of(data, struct iwl_priv, scan_check.work);
1026
1027 IWL_DEBUG_SCAN(priv, "Scan check work\n");
1028
1029
1030
1031
1032 mutex_lock(&priv->mutex);
1033 iwl_force_scan_end(priv);
1034 mutex_unlock(&priv->mutex);
1035}
1036
1037static void iwl_bg_abort_scan(struct work_struct *work)
1038{
1039 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
1040
1041 IWL_DEBUG_SCAN(priv, "Abort scan work\n");
1042
1043
1044
1045 mutex_lock(&priv->mutex);
1046 iwl_scan_cancel_timeout(priv, 200);
1047 mutex_unlock(&priv->mutex);
1048}
1049
1050static void iwl_bg_scan_completed(struct work_struct *work)
1051{
1052 struct iwl_priv *priv =
1053 container_of(work, struct iwl_priv, scan_completed);
1054
1055 mutex_lock(&priv->mutex);
1056 iwl_process_scan_complete(priv);
1057 mutex_unlock(&priv->mutex);
1058}
1059
1060void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
1061{
1062 INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
1063 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
1064 INIT_WORK(&priv->start_internal_scan, iwl_bg_start_internal_scan);
1065 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
1066}
1067
1068void iwl_cancel_scan_deferred_work(struct iwl_priv *priv)
1069{
1070 cancel_work_sync(&priv->start_internal_scan);
1071 cancel_work_sync(&priv->abort_scan);
1072 cancel_work_sync(&priv->scan_completed);
1073
1074 if (cancel_delayed_work_sync(&priv->scan_check)) {
1075 mutex_lock(&priv->mutex);
1076 iwl_force_scan_end(priv);
1077 mutex_unlock(&priv->mutex);
1078 }
1079}
1080