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ARM: mm: Recreate kernel mappings in early_paging_init()
[linux/fpc-iii.git] / drivers / net / wireless / iwlwifi / dvm / scan.c
blob35e0ee8b4e5b64162ecdb2287ae53ab3acd5ee4b
1 /******************************************************************************
2 *
3 * GPL LICENSE SUMMARY
4 *
5 * Copyright(c) 2008 - 2013 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 COPYING.
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 "dev.h"
34 #include "agn.h"
35
36 /* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
37 * sending probe req. This should be set long enough to hear probe responses
38 * from more than one AP. */
39 #define IWL_ACTIVE_DWELL_TIME_24 (30) /* all times in msec */
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 /* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
46 * Must be set longer than active dwell time.
47 * For the most reliable scan, set > AP beacon interval (typically 100msec). */
48 #define IWL_PASSIVE_DWELL_TIME_24 (20) /* all times in msec */
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 /* For reset radio, need minimal dwell time only */
55 #define IWL_RADIO_RESET_DWELL_TIME 5
56
57 static 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_SYNC | CMD_WANT_SKB,
63 };
64 __le32 *status;
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->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 /* The scan abort will return 1 for success or
81 * 2 for "failure". A failure condition can be
82 * due to simply not being in an active scan which
83 * can occur if we send the scan abort before we
84 * the microcode has notified us that a scan is
85 * completed. */
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
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 priv->scan_type = IWL_SCAN_NORMAL;
104 priv->scan_vif = NULL;
105 priv->scan_request = NULL;
106 }
107
108 static void iwl_process_scan_complete(struct iwl_priv *priv)
109 {
110 bool aborted;
111
112 lockdep_assert_held(&priv->mutex);
113
114 if (!test_and_clear_bit(STATUS_SCAN_COMPLETE, &priv->status))
115 return;
116
117 IWL_DEBUG_SCAN(priv, "Completed scan.\n");
118
119 cancel_delayed_work(&priv->scan_check);
120
121 aborted = test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->status);
122 if (aborted)
123 IWL_DEBUG_SCAN(priv, "Aborted scan completed.\n");
124
125 if (!test_and_clear_bit(STATUS_SCANNING, &priv->status)) {
126 IWL_DEBUG_SCAN(priv, "Scan already completed.\n");
127 goto out_settings;
128 }
129
130 if (priv->scan_type != IWL_SCAN_NORMAL && !aborted) {
131 int err;
132
133 /* Check if mac80211 requested scan during our internal scan */
134 if (priv->scan_request == NULL)
135 goto out_complete;
136
137 /* If so request a new scan */
138 err = iwl_scan_initiate(priv, priv->scan_vif, IWL_SCAN_NORMAL,
139 priv->scan_request->channels[0]->band);
140 if (err) {
141 IWL_DEBUG_SCAN(priv,
142 "failed to initiate pending scan: %d\n", err);
143 aborted = true;
144 goto out_complete;
145 }
146
147 return;
148 }
149
150 out_complete:
151 iwl_complete_scan(priv, aborted);
152
153 out_settings:
154 /* Can we still talk to firmware ? */
155 if (!iwl_is_ready_rf(priv))
156 return;
157
158 iwlagn_post_scan(priv);
159 }
160
161 void iwl_force_scan_end(struct iwl_priv *priv)
162 {
163 lockdep_assert_held(&priv->mutex);
164
165 if (!test_bit(STATUS_SCANNING, &priv->status)) {
166 IWL_DEBUG_SCAN(priv, "Forcing scan end while not scanning\n");
167 return;
168 }
169
170 IWL_DEBUG_SCAN(priv, "Forcing scan end\n");
171 clear_bit(STATUS_SCANNING, &priv->status);
172 clear_bit(STATUS_SCAN_HW, &priv->status);
173 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
174 clear_bit(STATUS_SCAN_COMPLETE, &priv->status);
175 iwl_complete_scan(priv, true);
176 }
177
178 static void iwl_do_scan_abort(struct iwl_priv *priv)
179 {
180 int ret;
181
182 lockdep_assert_held(&priv->mutex);
183
184 if (!test_bit(STATUS_SCANNING, &priv->status)) {
185 IWL_DEBUG_SCAN(priv, "Not performing scan to abort\n");
186 return;
187 }
188
189 if (test_and_set_bit(STATUS_SCAN_ABORTING, &priv->status)) {
190 IWL_DEBUG_SCAN(priv, "Scan abort in progress\n");
191 return;
192 }
193
194 ret = iwl_send_scan_abort(priv);
195 if (ret) {
196 IWL_DEBUG_SCAN(priv, "Send scan abort failed %d\n", ret);
197 iwl_force_scan_end(priv);
198 } else
199 IWL_DEBUG_SCAN(priv, "Successfully send scan abort\n");
200 }
201
202 /**
203 * iwl_scan_cancel - Cancel any currently executing HW scan
204 */
205 int iwl_scan_cancel(struct iwl_priv *priv)
206 {
207 IWL_DEBUG_SCAN(priv, "Queuing abort scan\n");
208 queue_work(priv->workqueue, &priv->abort_scan);
209 return 0;
210 }
211
212 /**
213 * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
214 * @ms: amount of time to wait (in milliseconds) for scan to abort
215 *
216 */
217 void iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
218 {
219 unsigned long timeout = jiffies + msecs_to_jiffies(ms);
220
221 lockdep_assert_held(&priv->mutex);
222
223 IWL_DEBUG_SCAN(priv, "Scan cancel timeout\n");
224
225 iwl_do_scan_abort(priv);
226
227 while (time_before_eq(jiffies, timeout)) {
228 if (!test_bit(STATUS_SCAN_HW, &priv->status))
229 goto finished;
230 msleep(20);
231 }
232
233 return;
234
235 finished:
236 /*
237 * Now STATUS_SCAN_HW is clear. This means that the
238 * device finished, but the background work is going
239 * to execute at best as soon as we release the mutex.
240 * Since we need to be able to issue a new scan right
241 * after this function returns, run the complete here.
242 * The STATUS_SCAN_COMPLETE bit will then be cleared
243 * and prevent the background work from "completing"
244 * a possible new scan.
245 */
246 iwl_process_scan_complete(priv);
247 }
248
249 /* Service response to REPLY_SCAN_CMD (0x80) */
250 static int iwl_rx_reply_scan(struct iwl_priv *priv,
251 struct iwl_rx_cmd_buffer *rxb,
252 struct iwl_device_cmd *cmd)
253 {
254 #ifdef CONFIG_IWLWIFI_DEBUG
255 struct iwl_rx_packet *pkt = rxb_addr(rxb);
256 struct iwl_scanreq_notification *notif = (void *)pkt->data;
257
258 IWL_DEBUG_SCAN(priv, "Scan request status = 0x%x\n", notif->status);
259 #endif
260 return 0;
261 }
262
263 /* Service SCAN_START_NOTIFICATION (0x82) */
264 static int iwl_rx_scan_start_notif(struct iwl_priv *priv,
265 struct iwl_rx_cmd_buffer *rxb,
266 struct iwl_device_cmd *cmd)
267 {
268 struct iwl_rx_packet *pkt = rxb_addr(rxb);
269 struct iwl_scanstart_notification *notif = (void *)pkt->data;
270
271 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
272 IWL_DEBUG_SCAN(priv, "Scan start: "
273 "%d [802.11%s] "
274 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
275 notif->channel,
276 notif->band ? "bg" : "a",
277 le32_to_cpu(notif->tsf_high),
278 le32_to_cpu(notif->tsf_low),
279 notif->status, notif->beacon_timer);
280
281 return 0;
282 }
283
284 /* Service SCAN_RESULTS_NOTIFICATION (0x83) */
285 static int iwl_rx_scan_results_notif(struct iwl_priv *priv,
286 struct iwl_rx_cmd_buffer *rxb,
287 struct iwl_device_cmd *cmd)
288 {
289 #ifdef CONFIG_IWLWIFI_DEBUG
290 struct iwl_rx_packet *pkt = rxb_addr(rxb);
291 struct iwl_scanresults_notification *notif = (void *)pkt->data;
292
293 IWL_DEBUG_SCAN(priv, "Scan ch.res: "
294 "%d [802.11%s] "
295 "probe status: %u:%u "
296 "(TSF: 0x%08X:%08X) - %d "
297 "elapsed=%lu usec\n",
298 notif->channel,
299 notif->band ? "bg" : "a",
300 notif->probe_status, notif->num_probe_not_sent,
301 le32_to_cpu(notif->tsf_high),
302 le32_to_cpu(notif->tsf_low),
303 le32_to_cpu(notif->statistics[0]),
304 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf);
305 #endif
306 return 0;
307 }
308
309 /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
310 static int iwl_rx_scan_complete_notif(struct iwl_priv *priv,
311 struct iwl_rx_cmd_buffer *rxb,
312 struct iwl_device_cmd *cmd)
313 {
314 struct iwl_rx_packet *pkt = rxb_addr(rxb);
315 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->data;
316
317 IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
318 scan_notif->scanned_channels,
319 scan_notif->tsf_low,
320 scan_notif->tsf_high, scan_notif->status);
321
322 IWL_DEBUG_SCAN(priv, "Scan on %sGHz took %dms\n",
323 (priv->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2",
324 jiffies_to_msecs(jiffies - priv->scan_start));
325
326 /*
327 * When aborting, we run the scan completed background work inline
328 * and the background work must then do nothing. The SCAN_COMPLETE
329 * bit helps implement that logic and thus needs to be set before
330 * queueing the work. Also, since the scan abort waits for SCAN_HW
331 * to clear, we need to set SCAN_COMPLETE before clearing SCAN_HW
332 * to avoid a race there.
333 */
334 set_bit(STATUS_SCAN_COMPLETE, &priv->status);
335 clear_bit(STATUS_SCAN_HW, &priv->status);
336 queue_work(priv->workqueue, &priv->scan_completed);
337
338 if (priv->iw_mode != NL80211_IFTYPE_ADHOC &&
339 iwl_advanced_bt_coexist(priv) &&
340 priv->bt_status != scan_notif->bt_status) {
341 if (scan_notif->bt_status) {
342 /* BT on */
343 if (!priv->bt_ch_announce)
344 priv->bt_traffic_load =
345 IWL_BT_COEX_TRAFFIC_LOAD_HIGH;
346 /*
347 * otherwise, no traffic load information provided
348 * no changes made
349 */
350 } else {
351 /* BT off */
352 priv->bt_traffic_load =
353 IWL_BT_COEX_TRAFFIC_LOAD_NONE;
354 }
355 priv->bt_status = scan_notif->bt_status;
356 queue_work(priv->workqueue,
357 &priv->bt_traffic_change_work);
358 }
359 return 0;
360 }
361
362 void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
363 {
364 /* scan handlers */
365 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
366 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
367 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
368 iwl_rx_scan_results_notif;
369 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
370 iwl_rx_scan_complete_notif;
371 }
372
373 static u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
374 enum ieee80211_band band, u8 n_probes)
375 {
376 if (band == IEEE80211_BAND_5GHZ)
377 return IWL_ACTIVE_DWELL_TIME_52 +
378 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
379 else
380 return IWL_ACTIVE_DWELL_TIME_24 +
381 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
382 }
383
384 static u16 iwl_limit_dwell(struct iwl_priv *priv, u16 dwell_time)
385 {
386 struct iwl_rxon_context *ctx;
387 int limits[NUM_IWL_RXON_CTX] = {};
388 int n_active = 0;
389 u16 limit;
390
391 BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
392
393 /*
394 * If we're associated, we clamp the dwell time 98%
395 * of the beacon interval (minus 2 * channel tune time)
396 * If both contexts are active, we have to restrict to
397 * 1/2 of the minimum of them, because they might be in
398 * lock-step with the time inbetween only half of what
399 * time we'd have in each of them.
400 */
401 for_each_context(priv, ctx) {
402 switch (ctx->staging.dev_type) {
403 case RXON_DEV_TYPE_P2P:
404 /* no timing constraints */
405 continue;
406 case RXON_DEV_TYPE_ESS:
407 default:
408 /* timing constraints if associated */
409 if (!iwl_is_associated_ctx(ctx))
410 continue;
411 break;
412 case RXON_DEV_TYPE_CP:
413 case RXON_DEV_TYPE_2STA:
414 /*
415 * These seem to always have timers for TBTT
416 * active in uCode even when not associated yet.
417 */
418 break;
419 }
420
421 limits[n_active++] = ctx->beacon_int ?: IWL_PASSIVE_DWELL_BASE;
422 }
423
424 switch (n_active) {
425 case 0:
426 return dwell_time;
427 case 2:
428 limit = (limits[1] * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
429 limit /= 2;
430 dwell_time = min(limit, dwell_time);
431 /* fall through to limit further */
432 case 1:
433 limit = (limits[0] * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
434 limit /= n_active;
435 return min(limit, dwell_time);
436 default:
437 WARN_ON_ONCE(1);
438 return dwell_time;
439 }
440 }
441
442 static u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
443 enum ieee80211_band band)
444 {
445 u16 passive = (band == IEEE80211_BAND_2GHZ) ?
446 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
447 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
448
449 return iwl_limit_dwell(priv, passive);
450 }
451
452 /* Return valid, unused, channel for a passive scan to reset the RF */
453 static u8 iwl_get_single_channel_number(struct iwl_priv *priv,
454 enum ieee80211_band band)
455 {
456 struct ieee80211_supported_band *sband = priv->hw->wiphy->bands[band];
457 struct iwl_rxon_context *ctx;
458 int i;
459
460 for (i = 0; i < sband->n_channels; i++) {
461 bool busy = false;
462
463 for_each_context(priv, ctx) {
464 busy = sband->channels[i].hw_value ==
465 le16_to_cpu(ctx->staging.channel);
466 if (busy)
467 break;
468 }
469
470 if (busy)
471 continue;
472
473 if (!(sband->channels[i].flags & IEEE80211_CHAN_DISABLED))
474 return sband->channels[i].hw_value;
475 }
476
477 return 0;
478 }
479
480 static int iwl_get_channel_for_reset_scan(struct iwl_priv *priv,
481 struct ieee80211_vif *vif,
482 enum ieee80211_band band,
483 struct iwl_scan_channel *scan_ch)
484 {
485 const struct ieee80211_supported_band *sband;
486 u16 channel;
487
488 sband = iwl_get_hw_mode(priv, band);
489 if (!sband) {
490 IWL_ERR(priv, "invalid band\n");
491 return 0;
492 }
493
494 channel = iwl_get_single_channel_number(priv, band);
495 if (channel) {
496 scan_ch->channel = cpu_to_le16(channel);
497 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
498 scan_ch->active_dwell =
499 cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME);
500 scan_ch->passive_dwell =
501 cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME);
502 /* Set txpower levels to defaults */
503 scan_ch->dsp_atten = 110;
504 if (band == IEEE80211_BAND_5GHZ)
505 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
506 else
507 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
508 return 1;
509 }
510
511 IWL_ERR(priv, "no valid channel found\n");
512 return 0;
513 }
514
515 static int iwl_get_channels_for_scan(struct iwl_priv *priv,
516 struct ieee80211_vif *vif,
517 enum ieee80211_band band,
518 u8 is_active, u8 n_probes,
519 struct iwl_scan_channel *scan_ch)
520 {
521 struct ieee80211_channel *chan;
522 const struct ieee80211_supported_band *sband;
523 u16 passive_dwell = 0;
524 u16 active_dwell = 0;
525 int added, i;
526 u16 channel;
527
528 sband = iwl_get_hw_mode(priv, band);
529 if (!sband)
530 return 0;
531
532 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
533 passive_dwell = iwl_get_passive_dwell_time(priv, band);
534
535 if (passive_dwell <= active_dwell)
536 passive_dwell = active_dwell + 1;
537
538 for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) {
539 chan = priv->scan_request->channels[i];
540
541 if (chan->band != band)
542 continue;
543
544 channel = chan->hw_value;
545 scan_ch->channel = cpu_to_le16(channel);
546
547 if (!is_active || (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN))
548 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
549 else
550 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
551
552 if (n_probes)
553 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
554
555 scan_ch->active_dwell = cpu_to_le16(active_dwell);
556 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
557
558 /* Set txpower levels to defaults */
559 scan_ch->dsp_atten = 110;
560
561 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
562 * power level:
563 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
564 */
565 if (band == IEEE80211_BAND_5GHZ)
566 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
567 else
568 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
569
570 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n",
571 channel, le32_to_cpu(scan_ch->type),
572 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
573 "ACTIVE" : "PASSIVE",
574 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
575 active_dwell : passive_dwell);
576
577 scan_ch++;
578 added++;
579 }
580
581 IWL_DEBUG_SCAN(priv, "total channels to scan %d\n", added);
582 return added;
583 }
584
585 /**
586 * iwl_fill_probe_req - fill in all required fields and IE for probe request
587 */
588
589 static u16 iwl_fill_probe_req(struct ieee80211_mgmt *frame, const u8 *ta,
590 const u8 *ies, int ie_len, const u8 *ssid,
591 u8 ssid_len, int left)
592 {
593 int len = 0;
594 u8 *pos = NULL;
595
596 /* Make sure there is enough space for the probe request,
597 * two mandatory IEs and the data */
598 left -= 24;
599 if (left < 0)
600 return 0;
601
602 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
603 eth_broadcast_addr(frame->da);
604 memcpy(frame->sa, ta, ETH_ALEN);
605 eth_broadcast_addr(frame->bssid);
606 frame->seq_ctrl = 0;
607
608 len += 24;
609
610 /* ...next IE... */
611 pos = &frame->u.probe_req.variable[0];
612
613 /* fill in our SSID IE */
614 left -= ssid_len + 2;
615 if (left < 0)
616 return 0;
617 *pos++ = WLAN_EID_SSID;
618 *pos++ = ssid_len;
619 if (ssid && ssid_len) {
620 memcpy(pos, ssid, ssid_len);
621 pos += ssid_len;
622 }
623
624 len += ssid_len + 2;
625
626 if (WARN_ON(left < ie_len))
627 return len;
628
629 if (ies && ie_len) {
630 memcpy(pos, ies, ie_len);
631 len += ie_len;
632 }
633
634 return (u16)len;
635 }
636
637 static int iwlagn_request_scan(struct iwl_priv *priv, struct ieee80211_vif *vif)
638 {
639 struct iwl_host_cmd cmd = {
640 .id = REPLY_SCAN_CMD,
641 .len = { sizeof(struct iwl_scan_cmd), },
642 .flags = CMD_SYNC,
643 };
644 struct iwl_scan_cmd *scan;
645 struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
646 u32 rate_flags = 0;
647 u16 cmd_len = 0;
648 u16 rx_chain = 0;
649 enum ieee80211_band band;
650 u8 n_probes = 0;
651 u8 rx_ant = priv->nvm_data->valid_rx_ant;
652 u8 rate;
653 bool is_active = false;
654 int chan_mod;
655 u8 active_chains;
656 u8 scan_tx_antennas = priv->nvm_data->valid_tx_ant;
657 int ret;
658 int scan_cmd_size = sizeof(struct iwl_scan_cmd) +
659 MAX_SCAN_CHANNEL * sizeof(struct iwl_scan_channel) +
660 priv->fw->ucode_capa.max_probe_length;
661 const u8 *ssid = NULL;
662 u8 ssid_len = 0;
663
664 if (WARN_ON(priv->scan_type == IWL_SCAN_NORMAL &&
665 (!priv->scan_request ||
666 priv->scan_request->n_channels > MAX_SCAN_CHANNEL)))
667 return -EINVAL;
668
669 lockdep_assert_held(&priv->mutex);
670
671 if (vif)
672 ctx = iwl_rxon_ctx_from_vif(vif);
673
674 if (!priv->scan_cmd) {
675 priv->scan_cmd = kmalloc(scan_cmd_size, GFP_KERNEL);
676 if (!priv->scan_cmd) {
677 IWL_DEBUG_SCAN(priv,
678 "fail to allocate memory for scan\n");
679 return -ENOMEM;
680 }
681 }
682 scan = priv->scan_cmd;
683 memset(scan, 0, scan_cmd_size);
684
685 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
686 scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
687
688 if (iwl_is_any_associated(priv)) {
689 u16 interval = 0;
690 u32 extra;
691 u32 suspend_time = 100;
692 u32 scan_suspend_time = 100;
693
694 IWL_DEBUG_INFO(priv, "Scanning while associated...\n");
695 switch (priv->scan_type) {
696 case IWL_SCAN_RADIO_RESET:
697 interval = 0;
698 break;
699 case IWL_SCAN_NORMAL:
700 interval = vif->bss_conf.beacon_int;
701 break;
702 }
703
704 scan->suspend_time = 0;
705 scan->max_out_time = cpu_to_le32(200 * 1024);
706 if (!interval)
707 interval = suspend_time;
708
709 extra = (suspend_time / interval) << 22;
710 scan_suspend_time = (extra |
711 ((suspend_time % interval) * 1024));
712 scan->suspend_time = cpu_to_le32(scan_suspend_time);
713 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n",
714 scan_suspend_time, interval);
715 }
716
717 switch (priv->scan_type) {
718 case IWL_SCAN_RADIO_RESET:
719 IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n");
720 /*
721 * Override quiet time as firmware checks that active
722 * dwell is >= quiet; since we use passive scan it'll
723 * not actually be used.
724 */
725 scan->quiet_time = cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME);
726 break;
727 case IWL_SCAN_NORMAL:
728 if (priv->scan_request->n_ssids) {
729 int i, p = 0;
730 IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
731 /*
732 * The highest priority SSID is inserted to the
733 * probe request template.
734 */
735 ssid_len = priv->scan_request->ssids[0].ssid_len;
736 ssid = priv->scan_request->ssids[0].ssid;
737
738 /*
739 * Invert the order of ssids, the firmware will invert
740 * it back.
741 */
742 for (i = priv->scan_request->n_ssids - 1; i >= 1; i--) {
743 scan->direct_scan[p].id = WLAN_EID_SSID;
744 scan->direct_scan[p].len =
745 priv->scan_request->ssids[i].ssid_len;
746 memcpy(scan->direct_scan[p].ssid,
747 priv->scan_request->ssids[i].ssid,
748 priv->scan_request->ssids[i].ssid_len);
749 n_probes++;
750 p++;
751 }
752 is_active = true;
753 } else
754 IWL_DEBUG_SCAN(priv, "Start passive scan.\n");
755 break;
756 }
757
758 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
759 scan->tx_cmd.sta_id = ctx->bcast_sta_id;
760 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
761
762 switch (priv->scan_band) {
763 case IEEE80211_BAND_2GHZ:
764 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
765 chan_mod = le32_to_cpu(
766 priv->contexts[IWL_RXON_CTX_BSS].active.flags &
767 RXON_FLG_CHANNEL_MODE_MSK)
768 >> RXON_FLG_CHANNEL_MODE_POS;
769 if ((priv->scan_request && priv->scan_request->no_cck) ||
770 chan_mod == CHANNEL_MODE_PURE_40) {
771 rate = IWL_RATE_6M_PLCP;
772 } else {
773 rate = IWL_RATE_1M_PLCP;
774 rate_flags = RATE_MCS_CCK_MSK;
775 }
776 /*
777 * Internal scans are passive, so we can indiscriminately set
778 * the BT ignore flag on 2.4 GHz since it applies to TX only.
779 */
780 if (priv->lib->bt_params &&
781 priv->lib->bt_params->advanced_bt_coexist)
782 scan->tx_cmd.tx_flags |= TX_CMD_FLG_IGNORE_BT;
783 break;
784 case IEEE80211_BAND_5GHZ:
785 rate = IWL_RATE_6M_PLCP;
786 break;
787 default:
788 IWL_WARN(priv, "Invalid scan band\n");
789 return -EIO;
790 }
791
792 /*
793 * If active scanning is requested but a certain channel is
794 * marked passive, we can do active scanning if we detect
795 * transmissions.
796 *
797 * There is an issue with some firmware versions that triggers
798 * a sysassert on a "good CRC threshold" of zero (== disabled),
799 * on a radar channel even though this means that we should NOT
800 * send probes.
801 *
802 * The "good CRC threshold" is the number of frames that we
803 * need to receive during our dwell time on a channel before
804 * sending out probes -- setting this to a huge value will
805 * mean we never reach it, but at the same time work around
806 * the aforementioned issue. Thus use IWL_GOOD_CRC_TH_NEVER
807 * here instead of IWL_GOOD_CRC_TH_DISABLED.
808 *
809 * This was fixed in later versions along with some other
810 * scan changes, and the threshold behaves as a flag in those
811 * versions.
812 */
813 if (priv->new_scan_threshold_behaviour)
814 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
815 IWL_GOOD_CRC_TH_DISABLED;
816 else
817 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
818 IWL_GOOD_CRC_TH_NEVER;
819
820 band = priv->scan_band;
821
822 if (band == IEEE80211_BAND_2GHZ &&
823 priv->lib->bt_params &&
824 priv->lib->bt_params->advanced_bt_coexist) {
825 /* transmit 2.4 GHz probes only on first antenna */
826 scan_tx_antennas = first_antenna(scan_tx_antennas);
827 }
828
829 priv->scan_tx_ant[band] = iwl_toggle_tx_ant(priv,
830 priv->scan_tx_ant[band],
831 scan_tx_antennas);
832 rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]);
833 scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags);
834
835 /*
836 * In power save mode while associated use one chain,
837 * otherwise use all chains
838 */
839 if (test_bit(STATUS_POWER_PMI, &priv->status) &&
840 !(priv->hw->conf.flags & IEEE80211_CONF_IDLE)) {
841 /* rx_ant has been set to all valid chains previously */
842 active_chains = rx_ant &
843 ((u8)(priv->chain_noise_data.active_chains));
844 if (!active_chains)
845 active_chains = rx_ant;
846
847 IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n",
848 priv->chain_noise_data.active_chains);
849
850 rx_ant = first_antenna(active_chains);
851 }
852 if (priv->lib->bt_params &&
853 priv->lib->bt_params->advanced_bt_coexist &&
854 priv->bt_full_concurrent) {
855 /* operated as 1x1 in full concurrency mode */
856 rx_ant = first_antenna(rx_ant);
857 }
858
859 /* MIMO is not used here, but value is required */
860 rx_chain |=
861 priv->nvm_data->valid_rx_ant << RXON_RX_CHAIN_VALID_POS;
862 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS;
863 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS;
864 rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS;
865 scan->rx_chain = cpu_to_le16(rx_chain);
866 switch (priv->scan_type) {
867 case IWL_SCAN_NORMAL:
868 cmd_len = iwl_fill_probe_req(
869 (struct ieee80211_mgmt *)scan->data,
870 vif->addr,
871 priv->scan_request->ie,
872 priv->scan_request->ie_len,
873 ssid, ssid_len,
874 scan_cmd_size - sizeof(*scan));
875 break;
876 case IWL_SCAN_RADIO_RESET:
877 /* use bcast addr, will not be transmitted but must be valid */
878 cmd_len = iwl_fill_probe_req(
879 (struct ieee80211_mgmt *)scan->data,
880 iwl_bcast_addr, NULL, 0,
881 NULL, 0,
882 scan_cmd_size - sizeof(*scan));
883 break;
884 default:
885 BUG();
886 }
887 scan->tx_cmd.len = cpu_to_le16(cmd_len);
888
889 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
890 RXON_FILTER_BCON_AWARE_MSK);
891
892 switch (priv->scan_type) {
893 case IWL_SCAN_RADIO_RESET:
894 scan->channel_count =
895 iwl_get_channel_for_reset_scan(priv, vif, band,
896 (void *)&scan->data[cmd_len]);
897 break;
898 case IWL_SCAN_NORMAL:
899 scan->channel_count =
900 iwl_get_channels_for_scan(priv, vif, band,
901 is_active, n_probes,
902 (void *)&scan->data[cmd_len]);
903 break;
904 }
905
906 if (scan->channel_count == 0) {
907 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
908 return -EIO;
909 }
910
911 cmd.len[0] += le16_to_cpu(scan->tx_cmd.len) +
912 scan->channel_count * sizeof(struct iwl_scan_channel);
913 cmd.data[0] = scan;
914 cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
915 scan->len = cpu_to_le16(cmd.len[0]);
916
917 /* set scan bit here for PAN params */
918 set_bit(STATUS_SCAN_HW, &priv->status);
919
920 ret = iwlagn_set_pan_params(priv);
921 if (ret) {
922 clear_bit(STATUS_SCAN_HW, &priv->status);
923 return ret;
924 }
925
926 ret = iwl_dvm_send_cmd(priv, &cmd);
927 if (ret) {
928 clear_bit(STATUS_SCAN_HW, &priv->status);
929 iwlagn_set_pan_params(priv);
930 }
931
932 return ret;
933 }
934
935 void iwl_init_scan_params(struct iwl_priv *priv)
936 {
937 u8 ant_idx = fls(priv->nvm_data->valid_tx_ant) - 1;
938 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
939 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
940 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
941 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
942 }
943
944 int __must_check iwl_scan_initiate(struct iwl_priv *priv,
945 struct ieee80211_vif *vif,
946 enum iwl_scan_type scan_type,
947 enum ieee80211_band band)
948 {
949 int ret;
950
951 lockdep_assert_held(&priv->mutex);
952
953 cancel_delayed_work(&priv->scan_check);
954
955 if (!iwl_is_ready_rf(priv)) {
956 IWL_WARN(priv, "Request scan called when driver not ready.\n");
957 return -EIO;
958 }
959
960 if (test_bit(STATUS_SCAN_HW, &priv->status)) {
961 IWL_DEBUG_SCAN(priv,
962 "Multiple concurrent scan requests in parallel.\n");
963 return -EBUSY;
964 }
965
966 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
967 IWL_DEBUG_SCAN(priv, "Scan request while abort pending.\n");
968 return -EBUSY;
969 }
970
971 IWL_DEBUG_SCAN(priv, "Starting %sscan...\n",
972 scan_type == IWL_SCAN_NORMAL ? "" :
973 "internal short ");
974
975 set_bit(STATUS_SCANNING, &priv->status);
976 priv->scan_type = scan_type;
977 priv->scan_start = jiffies;
978 priv->scan_band = band;
979
980 ret = iwlagn_request_scan(priv, vif);
981 if (ret) {
982 clear_bit(STATUS_SCANNING, &priv->status);
983 priv->scan_type = IWL_SCAN_NORMAL;
984 return ret;
985 }
986
987 queue_delayed_work(priv->workqueue, &priv->scan_check,
988 IWL_SCAN_CHECK_WATCHDOG);
989
990 return 0;
991 }
992
993
994 /*
995 * internal short scan, this function should only been called while associated.
996 * It will reset and tune the radio to prevent possible RF related problem
997 */
998 void iwl_internal_short_hw_scan(struct iwl_priv *priv)
999 {
1000 queue_work(priv->workqueue, &priv->start_internal_scan);
1001 }
1002
1003 static void iwl_bg_start_internal_scan(struct work_struct *work)
1004 {
1005 struct iwl_priv *priv =
1006 container_of(work, struct iwl_priv, start_internal_scan);
1007
1008 IWL_DEBUG_SCAN(priv, "Start internal scan\n");
1009
1010 mutex_lock(&priv->mutex);
1011
1012 if (priv->scan_type == IWL_SCAN_RADIO_RESET) {
1013 IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n");
1014 goto unlock;
1015 }
1016
1017 if (test_bit(STATUS_SCANNING, &priv->status)) {
1018 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
1019 goto unlock;
1020 }
1021
1022 if (iwl_scan_initiate(priv, NULL, IWL_SCAN_RADIO_RESET, priv->band))
1023 IWL_DEBUG_SCAN(priv, "failed to start internal short scan\n");
1024 unlock:
1025 mutex_unlock(&priv->mutex);
1026 }
1027
1028 static void iwl_bg_scan_check(struct work_struct *data)
1029 {
1030 struct iwl_priv *priv =
1031 container_of(data, struct iwl_priv, scan_check.work);
1032
1033 IWL_DEBUG_SCAN(priv, "Scan check work\n");
1034
1035 /* Since we are here firmware does not finish scan and
1036 * most likely is in bad shape, so we don't bother to
1037 * send abort command, just force scan complete to mac80211 */
1038 mutex_lock(&priv->mutex);
1039 iwl_force_scan_end(priv);
1040 mutex_unlock(&priv->mutex);
1041 }
1042
1043 static void iwl_bg_abort_scan(struct work_struct *work)
1044 {
1045 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
1046
1047 IWL_DEBUG_SCAN(priv, "Abort scan work\n");
1048
1049 /* We keep scan_check work queued in case when firmware will not
1050 * report back scan completed notification */
1051 mutex_lock(&priv->mutex);
1052 iwl_scan_cancel_timeout(priv, 200);
1053 mutex_unlock(&priv->mutex);
1054 }
1055
1056 static void iwl_bg_scan_completed(struct work_struct *work)
1057 {
1058 struct iwl_priv *priv =
1059 container_of(work, struct iwl_priv, scan_completed);
1060
1061 mutex_lock(&priv->mutex);
1062 iwl_process_scan_complete(priv);
1063 mutex_unlock(&priv->mutex);
1064 }
1065
1066 void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
1067 {
1068 INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
1069 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
1070 INIT_WORK(&priv->start_internal_scan, iwl_bg_start_internal_scan);
1071 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
1072 }
1073
1074 void iwl_cancel_scan_deferred_work(struct iwl_priv *priv)
1075 {
1076 cancel_work_sync(&priv->start_internal_scan);
1077 cancel_work_sync(&priv->abort_scan);
1078 cancel_work_sync(&priv->scan_completed);
1079
1080 if (cancel_delayed_work_sync(&priv->scan_check)) {
1081 mutex_lock(&priv->mutex);
1082 iwl_force_scan_end(priv);
1083 mutex_unlock(&priv->mutex);
1084 }
1085 }
Linux with added FPC-III support