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