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net/mlx4_en: Move filters cleanup to a proper location
[linux/fpc-iii.git] / drivers / net / wireless / intel / iwlwifi / dvm / scan.c
blobd01766f16175eac5c3c6b8e66e95a75e89dafc50
1 /******************************************************************************
2 *
3 * GPL LICENSE SUMMARY
4 *
5 * Copyright(c) 2008 - 2014 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 <linuxwifi@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_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 void iwl_rx_reply_scan(struct iwl_priv *priv,
251 struct iwl_rx_cmd_buffer *rxb)
252 {
253 #ifdef CONFIG_IWLWIFI_DEBUG
254 struct iwl_rx_packet *pkt = rxb_addr(rxb);
255 struct iwl_scanreq_notification *notif = (void *)pkt->data;
256
257 IWL_DEBUG_SCAN(priv, "Scan request status = 0x%x\n", notif->status);
258 #endif
259 }
260
261 /* Service SCAN_START_NOTIFICATION (0x82) */
262 static void iwl_rx_scan_start_notif(struct iwl_priv *priv,
263 struct iwl_rx_cmd_buffer *rxb)
264 {
265 struct iwl_rx_packet *pkt = rxb_addr(rxb);
266 struct iwl_scanstart_notification *notif = (void *)pkt->data;
267
268 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
269 IWL_DEBUG_SCAN(priv, "Scan start: "
270 "%d [802.11%s] "
271 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
272 notif->channel,
273 notif->band ? "bg" : "a",
274 le32_to_cpu(notif->tsf_high),
275 le32_to_cpu(notif->tsf_low),
276 notif->status, notif->beacon_timer);
277 }
278
279 /* Service SCAN_RESULTS_NOTIFICATION (0x83) */
280 static void iwl_rx_scan_results_notif(struct iwl_priv *priv,
281 struct iwl_rx_cmd_buffer *rxb)
282 {
283 #ifdef CONFIG_IWLWIFI_DEBUG
284 struct iwl_rx_packet *pkt = rxb_addr(rxb);
285 struct iwl_scanresults_notification *notif = (void *)pkt->data;
286
287 IWL_DEBUG_SCAN(priv, "Scan ch.res: "
288 "%d [802.11%s] "
289 "probe status: %u:%u "
290 "(TSF: 0x%08X:%08X) - %d "
291 "elapsed=%lu usec\n",
292 notif->channel,
293 notif->band ? "bg" : "a",
294 notif->probe_status, notif->num_probe_not_sent,
295 le32_to_cpu(notif->tsf_high),
296 le32_to_cpu(notif->tsf_low),
297 le32_to_cpu(notif->statistics[0]),
298 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf);
299 #endif
300 }
301
302 /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
303 static void iwl_rx_scan_complete_notif(struct iwl_priv *priv,
304 struct iwl_rx_cmd_buffer *rxb)
305 {
306 struct iwl_rx_packet *pkt = rxb_addr(rxb);
307 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->data;
308
309 IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
310 scan_notif->scanned_channels,
311 scan_notif->tsf_low,
312 scan_notif->tsf_high, scan_notif->status);
313
314 IWL_DEBUG_SCAN(priv, "Scan on %sGHz took %dms\n",
315 (priv->scan_band == NL80211_BAND_2GHZ) ? "2.4" : "5.2",
316 jiffies_to_msecs(jiffies - priv->scan_start));
317
318 /*
319 * When aborting, we run the scan completed background work inline
320 * and the background work must then do nothing. The SCAN_COMPLETE
321 * bit helps implement that logic and thus needs to be set before
322 * queueing the work. Also, since the scan abort waits for SCAN_HW
323 * to clear, we need to set SCAN_COMPLETE before clearing SCAN_HW
324 * to avoid a race there.
325 */
326 set_bit(STATUS_SCAN_COMPLETE, &priv->status);
327 clear_bit(STATUS_SCAN_HW, &priv->status);
328 queue_work(priv->workqueue, &priv->scan_completed);
329
330 if (priv->iw_mode != NL80211_IFTYPE_ADHOC &&
331 iwl_advanced_bt_coexist(priv) &&
332 priv->bt_status != scan_notif->bt_status) {
333 if (scan_notif->bt_status) {
334 /* BT on */
335 if (!priv->bt_ch_announce)
336 priv->bt_traffic_load =
337 IWL_BT_COEX_TRAFFIC_LOAD_HIGH;
338 /*
339 * otherwise, no traffic load information provided
340 * no changes made
341 */
342 } else {
343 /* BT off */
344 priv->bt_traffic_load =
345 IWL_BT_COEX_TRAFFIC_LOAD_NONE;
346 }
347 priv->bt_status = scan_notif->bt_status;
348 queue_work(priv->workqueue,
349 &priv->bt_traffic_change_work);
350 }
351 }
352
353 void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
354 {
355 /* scan handlers */
356 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
357 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
358 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
359 iwl_rx_scan_results_notif;
360 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
361 iwl_rx_scan_complete_notif;
362 }
363
364 static u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
365 enum nl80211_band band, u8 n_probes)
366 {
367 if (band == NL80211_BAND_5GHZ)
368 return IWL_ACTIVE_DWELL_TIME_52 +
369 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
370 else
371 return IWL_ACTIVE_DWELL_TIME_24 +
372 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
373 }
374
375 static u16 iwl_limit_dwell(struct iwl_priv *priv, u16 dwell_time)
376 {
377 struct iwl_rxon_context *ctx;
378 int limits[NUM_IWL_RXON_CTX] = {};
379 int n_active = 0;
380 u16 limit;
381
382 BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
383
384 /*
385 * If we're associated, we clamp the dwell time 98%
386 * of the beacon interval (minus 2 * channel tune time)
387 * If both contexts are active, we have to restrict to
388 * 1/2 of the minimum of them, because they might be in
389 * lock-step with the time inbetween only half of what
390 * time we'd have in each of them.
391 */
392 for_each_context(priv, ctx) {
393 switch (ctx->staging.dev_type) {
394 case RXON_DEV_TYPE_P2P:
395 /* no timing constraints */
396 continue;
397 case RXON_DEV_TYPE_ESS:
398 default:
399 /* timing constraints if associated */
400 if (!iwl_is_associated_ctx(ctx))
401 continue;
402 break;
403 case RXON_DEV_TYPE_CP:
404 case RXON_DEV_TYPE_2STA:
405 /*
406 * These seem to always have timers for TBTT
407 * active in uCode even when not associated yet.
408 */
409 break;
410 }
411
412 limits[n_active++] = ctx->beacon_int ?: IWL_PASSIVE_DWELL_BASE;
413 }
414
415 switch (n_active) {
416 case 0:
417 return dwell_time;
418 case 2:
419 limit = (limits[1] * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
420 limit /= 2;
421 dwell_time = min(limit, dwell_time);
422 /* fall through to limit further */
423 case 1:
424 limit = (limits[0] * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
425 limit /= n_active;
426 return min(limit, dwell_time);
427 default:
428 WARN_ON_ONCE(1);
429 return dwell_time;
430 }
431 }
432
433 static u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
434 enum nl80211_band band)
435 {
436 u16 passive = (band == NL80211_BAND_2GHZ) ?
437 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
438 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
439
440 return iwl_limit_dwell(priv, passive);
441 }
442
443 /* Return valid, unused, channel for a passive scan to reset the RF */
444 static u8 iwl_get_single_channel_number(struct iwl_priv *priv,
445 enum nl80211_band band)
446 {
447 struct ieee80211_supported_band *sband = priv->hw->wiphy->bands[band];
448 struct iwl_rxon_context *ctx;
449 int i;
450
451 for (i = 0; i < sband->n_channels; i++) {
452 bool busy = false;
453
454 for_each_context(priv, ctx) {
455 busy = sband->channels[i].hw_value ==
456 le16_to_cpu(ctx->staging.channel);
457 if (busy)
458 break;
459 }
460
461 if (busy)
462 continue;
463
464 if (!(sband->channels[i].flags & IEEE80211_CHAN_DISABLED))
465 return sband->channels[i].hw_value;
466 }
467
468 return 0;
469 }
470
471 static int iwl_get_channel_for_reset_scan(struct iwl_priv *priv,
472 struct ieee80211_vif *vif,
473 enum nl80211_band band,
474 struct iwl_scan_channel *scan_ch)
475 {
476 const struct ieee80211_supported_band *sband;
477 u16 channel;
478
479 sband = iwl_get_hw_mode(priv, band);
480 if (!sband) {
481 IWL_ERR(priv, "invalid band\n");
482 return 0;
483 }
484
485 channel = iwl_get_single_channel_number(priv, band);
486 if (channel) {
487 scan_ch->channel = cpu_to_le16(channel);
488 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
489 scan_ch->active_dwell =
490 cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME);
491 scan_ch->passive_dwell =
492 cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME);
493 /* Set txpower levels to defaults */
494 scan_ch->dsp_atten = 110;
495 if (band == NL80211_BAND_5GHZ)
496 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
497 else
498 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
499 return 1;
500 }
501
502 IWL_ERR(priv, "no valid channel found\n");
503 return 0;
504 }
505
506 static int iwl_get_channels_for_scan(struct iwl_priv *priv,
507 struct ieee80211_vif *vif,
508 enum nl80211_band band,
509 u8 is_active, u8 n_probes,
510 struct iwl_scan_channel *scan_ch)
511 {
512 struct ieee80211_channel *chan;
513 const struct ieee80211_supported_band *sband;
514 u16 passive_dwell = 0;
515 u16 active_dwell = 0;
516 int added, i;
517 u16 channel;
518
519 sband = iwl_get_hw_mode(priv, band);
520 if (!sband)
521 return 0;
522
523 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
524 passive_dwell = iwl_get_passive_dwell_time(priv, band);
525
526 if (passive_dwell <= active_dwell)
527 passive_dwell = active_dwell + 1;
528
529 for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) {
530 chan = priv->scan_request->channels[i];
531
532 if (chan->band != band)
533 continue;
534
535 channel = chan->hw_value;
536 scan_ch->channel = cpu_to_le16(channel);
537
538 if (!is_active || (chan->flags & IEEE80211_CHAN_NO_IR))
539 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
540 else
541 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
542
543 if (n_probes)
544 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
545
546 scan_ch->active_dwell = cpu_to_le16(active_dwell);
547 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
548
549 /* Set txpower levels to defaults */
550 scan_ch->dsp_atten = 110;
551
552 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
553 * power level:
554 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
555 */
556 if (band == NL80211_BAND_5GHZ)
557 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
558 else
559 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
560
561 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n",
562 channel, le32_to_cpu(scan_ch->type),
563 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
564 "ACTIVE" : "PASSIVE",
565 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
566 active_dwell : passive_dwell);
567
568 scan_ch++;
569 added++;
570 }
571
572 IWL_DEBUG_SCAN(priv, "total channels to scan %d\n", added);
573 return added;
574 }
575
576 /**
577 * iwl_fill_probe_req - fill in all required fields and IE for probe request
578 */
579
580 static u16 iwl_fill_probe_req(struct ieee80211_mgmt *frame, const u8 *ta,
581 const u8 *ies, int ie_len, const u8 *ssid,
582 u8 ssid_len, int left)
583 {
584 int len = 0;
585 u8 *pos = NULL;
586
587 /* Make sure there is enough space for the probe request,
588 * two mandatory IEs and the data */
589 left -= 24;
590 if (left < 0)
591 return 0;
592
593 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
594 eth_broadcast_addr(frame->da);
595 memcpy(frame->sa, ta, ETH_ALEN);
596 eth_broadcast_addr(frame->bssid);
597 frame->seq_ctrl = 0;
598
599 len += 24;
600
601 /* ...next IE... */
602 pos = &frame->u.probe_req.variable[0];
603
604 /* fill in our SSID IE */
605 left -= ssid_len + 2;
606 if (left < 0)
607 return 0;
608 *pos++ = WLAN_EID_SSID;
609 *pos++ = ssid_len;
610 if (ssid && ssid_len) {
611 memcpy(pos, ssid, ssid_len);
612 pos += ssid_len;
613 }
614
615 len += ssid_len + 2;
616
617 if (WARN_ON(left < ie_len))
618 return len;
619
620 if (ies && ie_len) {
621 memcpy(pos, ies, ie_len);
622 len += ie_len;
623 }
624
625 return (u16)len;
626 }
627
628 static int iwlagn_request_scan(struct iwl_priv *priv, struct ieee80211_vif *vif)
629 {
630 struct iwl_host_cmd cmd = {
631 .id = REPLY_SCAN_CMD,
632 .len = { sizeof(struct iwl_scan_cmd), },
633 };
634 struct iwl_scan_cmd *scan;
635 struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
636 u32 rate_flags = 0;
637 u16 cmd_len = 0;
638 u16 rx_chain = 0;
639 enum nl80211_band band;
640 u8 n_probes = 0;
641 u8 rx_ant = priv->nvm_data->valid_rx_ant;
642 u8 rate;
643 bool is_active = false;
644 int chan_mod;
645 u8 active_chains;
646 u8 scan_tx_antennas = priv->nvm_data->valid_tx_ant;
647 int ret;
648 int scan_cmd_size = sizeof(struct iwl_scan_cmd) +
649 MAX_SCAN_CHANNEL * sizeof(struct iwl_scan_channel) +
650 priv->fw->ucode_capa.max_probe_length;
651 const u8 *ssid = NULL;
652 u8 ssid_len = 0;
653
654 if (WARN_ON(priv->scan_type == IWL_SCAN_NORMAL &&
655 (!priv->scan_request ||
656 priv->scan_request->n_channels > MAX_SCAN_CHANNEL)))
657 return -EINVAL;
658
659 lockdep_assert_held(&priv->mutex);
660
661 if (vif)
662 ctx = iwl_rxon_ctx_from_vif(vif);
663
664 if (!priv->scan_cmd) {
665 priv->scan_cmd = kmalloc(scan_cmd_size, GFP_KERNEL);
666 if (!priv->scan_cmd) {
667 IWL_DEBUG_SCAN(priv,
668 "fail to allocate memory for scan\n");
669 return -ENOMEM;
670 }
671 }
672 scan = priv->scan_cmd;
673 memset(scan, 0, scan_cmd_size);
674
675 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
676 scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
677
678 if (iwl_is_any_associated(priv)) {
679 u16 interval = 0;
680 u32 extra;
681 u32 suspend_time = 100;
682 u32 scan_suspend_time = 100;
683
684 IWL_DEBUG_INFO(priv, "Scanning while associated...\n");
685 switch (priv->scan_type) {
686 case IWL_SCAN_RADIO_RESET:
687 interval = 0;
688 break;
689 case IWL_SCAN_NORMAL:
690 interval = vif->bss_conf.beacon_int;
691 break;
692 }
693
694 scan->suspend_time = 0;
695 scan->max_out_time = cpu_to_le32(200 * 1024);
696 if (!interval)
697 interval = suspend_time;
698
699 extra = (suspend_time / interval) << 22;
700 scan_suspend_time = (extra |
701 ((suspend_time % interval) * 1024));
702 scan->suspend_time = cpu_to_le32(scan_suspend_time);
703 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n",
704 scan_suspend_time, interval);
705 }
706
707 switch (priv->scan_type) {
708 case IWL_SCAN_RADIO_RESET:
709 IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n");
710 /*
711 * Override quiet time as firmware checks that active
712 * dwell is >= quiet; since we use passive scan it'll
713 * not actually be used.
714 */
715 scan->quiet_time = cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME);
716 break;
717 case IWL_SCAN_NORMAL:
718 if (priv->scan_request->n_ssids) {
719 int i, p = 0;
720 IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
721 /*
722 * The highest priority SSID is inserted to the
723 * probe request template.
724 */
725 ssid_len = priv->scan_request->ssids[0].ssid_len;
726 ssid = priv->scan_request->ssids[0].ssid;
727
728 /*
729 * Invert the order of ssids, the firmware will invert
730 * it back.
731 */
732 for (i = priv->scan_request->n_ssids - 1; i >= 1; i--) {
733 scan->direct_scan[p].id = WLAN_EID_SSID;
734 scan->direct_scan[p].len =
735 priv->scan_request->ssids[i].ssid_len;
736 memcpy(scan->direct_scan[p].ssid,
737 priv->scan_request->ssids[i].ssid,
738 priv->scan_request->ssids[i].ssid_len);
739 n_probes++;
740 p++;
741 }
742 is_active = true;
743 } else
744 IWL_DEBUG_SCAN(priv, "Start passive scan.\n");
745 break;
746 }
747
748 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
749 scan->tx_cmd.sta_id = ctx->bcast_sta_id;
750 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
751
752 switch (priv->scan_band) {
753 case NL80211_BAND_2GHZ:
754 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
755 chan_mod = le32_to_cpu(
756 priv->contexts[IWL_RXON_CTX_BSS].active.flags &
757 RXON_FLG_CHANNEL_MODE_MSK)
758 >> RXON_FLG_CHANNEL_MODE_POS;
759 if ((priv->scan_request && priv->scan_request->no_cck) ||
760 chan_mod == CHANNEL_MODE_PURE_40) {
761 rate = IWL_RATE_6M_PLCP;
762 } else {
763 rate = IWL_RATE_1M_PLCP;
764 rate_flags = RATE_MCS_CCK_MSK;
765 }
766 /*
767 * Internal scans are passive, so we can indiscriminately set
768 * the BT ignore flag on 2.4 GHz since it applies to TX only.
769 */
770 if (priv->lib->bt_params &&
771 priv->lib->bt_params->advanced_bt_coexist)
772 scan->tx_cmd.tx_flags |= TX_CMD_FLG_IGNORE_BT;
773 break;
774 case NL80211_BAND_5GHZ:
775 rate = IWL_RATE_6M_PLCP;
776 break;
777 default:
778 IWL_WARN(priv, "Invalid scan band\n");
779 return -EIO;
780 }
781
782 /*
783 * If active scanning is requested but a certain channel is
784 * marked passive, we can do active scanning if we detect
785 * transmissions.
786 *
787 * There is an issue with some firmware versions that triggers
788 * a sysassert on a "good CRC threshold" of zero (== disabled),
789 * on a radar channel even though this means that we should NOT
790 * send probes.
791 *
792 * The "good CRC threshold" is the number of frames that we
793 * need to receive during our dwell time on a channel before
794 * sending out probes -- setting this to a huge value will
795 * mean we never reach it, but at the same time work around
796 * the aforementioned issue. Thus use IWL_GOOD_CRC_TH_NEVER
797 * here instead of IWL_GOOD_CRC_TH_DISABLED.
798 *
799 * This was fixed in later versions along with some other
800 * scan changes, and the threshold behaves as a flag in those
801 * versions.
802 */
803 if (priv->new_scan_threshold_behaviour)
804 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
805 IWL_GOOD_CRC_TH_DISABLED;
806 else
807 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
808 IWL_GOOD_CRC_TH_NEVER;
809
810 band = priv->scan_band;
811
812 if (band == NL80211_BAND_2GHZ &&
813 priv->lib->bt_params &&
814 priv->lib->bt_params->advanced_bt_coexist) {
815 /* transmit 2.4 GHz probes only on first antenna */
816 scan_tx_antennas = first_antenna(scan_tx_antennas);
817 }
818
819 priv->scan_tx_ant[band] = iwl_toggle_tx_ant(priv,
820 priv->scan_tx_ant[band],
821 scan_tx_antennas);
822 rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]);
823 scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags);
824
825 /*
826 * In power save mode while associated use one chain,
827 * otherwise use all chains
828 */
829 if (test_bit(STATUS_POWER_PMI, &priv->status) &&
830 !(priv->hw->conf.flags & IEEE80211_CONF_IDLE)) {
831 /* rx_ant has been set to all valid chains previously */
832 active_chains = rx_ant &
833 ((u8)(priv->chain_noise_data.active_chains));
834 if (!active_chains)
835 active_chains = rx_ant;
836
837 IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n",
838 priv->chain_noise_data.active_chains);
839
840 rx_ant = first_antenna(active_chains);
841 }
842 if (priv->lib->bt_params &&
843 priv->lib->bt_params->advanced_bt_coexist &&
844 priv->bt_full_concurrent) {
845 /* operated as 1x1 in full concurrency mode */
846 rx_ant = first_antenna(rx_ant);
847 }
848
849 /* MIMO is not used here, but value is required */
850 rx_chain |=
851 priv->nvm_data->valid_rx_ant << RXON_RX_CHAIN_VALID_POS;
852 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS;
853 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS;
854 rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS;
855 scan->rx_chain = cpu_to_le16(rx_chain);
856 switch (priv->scan_type) {
857 case IWL_SCAN_NORMAL:
858 cmd_len = iwl_fill_probe_req(
859 (struct ieee80211_mgmt *)scan->data,
860 vif->addr,
861 priv->scan_request->ie,
862 priv->scan_request->ie_len,
863 ssid, ssid_len,
864 scan_cmd_size - sizeof(*scan));
865 break;
866 case IWL_SCAN_RADIO_RESET:
867 /* use bcast addr, will not be transmitted but must be valid */
868 cmd_len = iwl_fill_probe_req(
869 (struct ieee80211_mgmt *)scan->data,
870 iwl_bcast_addr, NULL, 0,
871 NULL, 0,
872 scan_cmd_size - sizeof(*scan));
873 break;
874 default:
875 BUG();
876 }
877 scan->tx_cmd.len = cpu_to_le16(cmd_len);
878
879 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
880 RXON_FILTER_BCON_AWARE_MSK);
881
882 switch (priv->scan_type) {
883 case IWL_SCAN_RADIO_RESET:
884 scan->channel_count =
885 iwl_get_channel_for_reset_scan(priv, vif, band,
886 (void *)&scan->data[cmd_len]);
887 break;
888 case IWL_SCAN_NORMAL:
889 scan->channel_count =
890 iwl_get_channels_for_scan(priv, vif, band,
891 is_active, n_probes,
892 (void *)&scan->data[cmd_len]);
893 break;
894 }
895
896 if (scan->channel_count == 0) {
897 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
898 return -EIO;
899 }
900
901 cmd.len[0] += le16_to_cpu(scan->tx_cmd.len) +
902 scan->channel_count * sizeof(struct iwl_scan_channel);
903 cmd.data[0] = scan;
904 cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
905 scan->len = cpu_to_le16(cmd.len[0]);
906
907 /* set scan bit here for PAN params */
908 set_bit(STATUS_SCAN_HW, &priv->status);
909
910 ret = iwlagn_set_pan_params(priv);
911 if (ret) {
912 clear_bit(STATUS_SCAN_HW, &priv->status);
913 return ret;
914 }
915
916 ret = iwl_dvm_send_cmd(priv, &cmd);
917 if (ret) {
918 clear_bit(STATUS_SCAN_HW, &priv->status);
919 iwlagn_set_pan_params(priv);
920 }
921
922 return ret;
923 }
924
925 void iwl_init_scan_params(struct iwl_priv *priv)
926 {
927 u8 ant_idx = fls(priv->nvm_data->valid_tx_ant) - 1;
928 if (!priv->scan_tx_ant[NL80211_BAND_5GHZ])
929 priv->scan_tx_ant[NL80211_BAND_5GHZ] = ant_idx;
930 if (!priv->scan_tx_ant[NL80211_BAND_2GHZ])
931 priv->scan_tx_ant[NL80211_BAND_2GHZ] = ant_idx;
932 }
933
934 int __must_check iwl_scan_initiate(struct iwl_priv *priv,
935 struct ieee80211_vif *vif,
936 enum iwl_scan_type scan_type,
937 enum nl80211_band band)
938 {
939 int ret;
940
941 lockdep_assert_held(&priv->mutex);
942
943 cancel_delayed_work(&priv->scan_check);
944
945 if (!iwl_is_ready_rf(priv)) {
946 IWL_WARN(priv, "Request scan called when driver not ready.\n");
947 return -EIO;
948 }
949
950 if (test_bit(STATUS_SCAN_HW, &priv->status)) {
951 IWL_DEBUG_SCAN(priv,
952 "Multiple concurrent scan requests in parallel.\n");
953 return -EBUSY;
954 }
955
956 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
957 IWL_DEBUG_SCAN(priv, "Scan request while abort pending.\n");
958 return -EBUSY;
959 }
960
961 IWL_DEBUG_SCAN(priv, "Starting %sscan...\n",
962 scan_type == IWL_SCAN_NORMAL ? "" :
963 "internal short ");
964
965 set_bit(STATUS_SCANNING, &priv->status);
966 priv->scan_type = scan_type;
967 priv->scan_start = jiffies;
968 priv->scan_band = band;
969
970 ret = iwlagn_request_scan(priv, vif);
971 if (ret) {
972 clear_bit(STATUS_SCANNING, &priv->status);
973 priv->scan_type = IWL_SCAN_NORMAL;
974 return ret;
975 }
976
977 queue_delayed_work(priv->workqueue, &priv->scan_check,
978 IWL_SCAN_CHECK_WATCHDOG);
979
980 return 0;
981 }
982
983
984 /*
985 * internal short scan, this function should only been called while associated.
986 * It will reset and tune the radio to prevent possible RF related problem
987 */
988 void iwl_internal_short_hw_scan(struct iwl_priv *priv)
989 {
990 queue_work(priv->workqueue, &priv->start_internal_scan);
991 }
992
993 static void iwl_bg_start_internal_scan(struct work_struct *work)
994 {
995 struct iwl_priv *priv =
996 container_of(work, struct iwl_priv, start_internal_scan);
997
998 IWL_DEBUG_SCAN(priv, "Start internal scan\n");
999
1000 mutex_lock(&priv->mutex);
1001
1002 if (priv->scan_type == IWL_SCAN_RADIO_RESET) {
1003 IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n");
1004 goto unlock;
1005 }
1006
1007 if (test_bit(STATUS_SCANNING, &priv->status)) {
1008 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
1009 goto unlock;
1010 }
1011
1012 if (iwl_scan_initiate(priv, NULL, IWL_SCAN_RADIO_RESET, priv->band))
1013 IWL_DEBUG_SCAN(priv, "failed to start internal short scan\n");
1014 unlock:
1015 mutex_unlock(&priv->mutex);
1016 }
1017
1018 static void iwl_bg_scan_check(struct work_struct *data)
1019 {
1020 struct iwl_priv *priv =
1021 container_of(data, struct iwl_priv, scan_check.work);
1022
1023 IWL_DEBUG_SCAN(priv, "Scan check work\n");
1024
1025 /* Since we are here firmware does not finish scan and
1026 * most likely is in bad shape, so we don't bother to
1027 * send abort command, just force scan complete to mac80211 */
1028 mutex_lock(&priv->mutex);
1029 iwl_force_scan_end(priv);
1030 mutex_unlock(&priv->mutex);
1031 }
1032
1033 static void iwl_bg_abort_scan(struct work_struct *work)
1034 {
1035 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
1036
1037 IWL_DEBUG_SCAN(priv, "Abort scan work\n");
1038
1039 /* We keep scan_check work queued in case when firmware will not
1040 * report back scan completed notification */
1041 mutex_lock(&priv->mutex);
1042 iwl_scan_cancel_timeout(priv, 200);
1043 mutex_unlock(&priv->mutex);
1044 }
1045
1046 static void iwl_bg_scan_completed(struct work_struct *work)
1047 {
1048 struct iwl_priv *priv =
1049 container_of(work, struct iwl_priv, scan_completed);
1050
1051 mutex_lock(&priv->mutex);
1052 iwl_process_scan_complete(priv);
1053 mutex_unlock(&priv->mutex);
1054 }
1055
1056 void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
1057 {
1058 INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
1059 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
1060 INIT_WORK(&priv->start_internal_scan, iwl_bg_start_internal_scan);
1061 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
1062 }
1063
1064 void iwl_cancel_scan_deferred_work(struct iwl_priv *priv)
1065 {
1066 cancel_work_sync(&priv->start_internal_scan);
1067 cancel_work_sync(&priv->abort_scan);
1068 cancel_work_sync(&priv->scan_completed);
1069
1070 if (cancel_delayed_work_sync(&priv->scan_check)) {
1071 mutex_lock(&priv->mutex);
1072 iwl_force_scan_end(priv);
1073 mutex_unlock(&priv->mutex);
1074 }
1075 }
Linux with added FPC-III support