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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless
[deliverable/linux.git] / drivers / net / wireless / iwlwifi / iwl-scan.c
1 /******************************************************************************
2 *
3 * GPL LICENSE SUMMARY
4 *
5 * Copyright(c) 2008 - 2012 Intel Corporation. All rights reserved.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of version 2 of the GNU General Public License as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
19 * USA
20 *
21 * The full GNU General Public License is included in this distribution
22 * in the file called LICENSE.GPL.
23 *
24 * Contact Information:
25 * Intel Linux Wireless <ilw@linux.intel.com>
26 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
27 *****************************************************************************/
28 #include <linux/slab.h>
29 #include <linux/types.h>
30 #include <linux/etherdevice.h>
31 #include <net/mac80211.h>
32
33 #include "iwl-eeprom.h"
34 #include "iwl-dev.h"
35 #include "iwl-core.h"
36 #include "iwl-io.h"
37 #include "iwl-agn.h"
38 #include "iwl-trans.h"
39
40 /* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
41 * sending probe req. This should be set long enough to hear probe responses
42 * from more than one AP. */
43 #define IWL_ACTIVE_DWELL_TIME_24 (30) /* all times in msec */
44 #define IWL_ACTIVE_DWELL_TIME_52 (20)
45
46 #define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3)
47 #define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2)
48
49 /* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
50 * Must be set longer than active dwell time.
51 * For the most reliable scan, set > AP beacon interval (typically 100msec). */
52 #define IWL_PASSIVE_DWELL_TIME_24 (20) /* all times in msec */
53 #define IWL_PASSIVE_DWELL_TIME_52 (10)
54 #define IWL_PASSIVE_DWELL_BASE (100)
55 #define IWL_CHANNEL_TUNE_TIME 5
56
57 static int iwl_send_scan_abort(struct iwl_priv *priv)
58 {
59 int ret;
60 struct iwl_rx_packet *pkt;
61 struct iwl_host_cmd cmd = {
62 .id = REPLY_SCAN_ABORT_CMD,
63 .flags = CMD_SYNC | CMD_WANT_SKB,
64 };
65
66 /* Exit instantly with error when device is not ready
67 * to receive scan abort command or it does not perform
68 * hardware scan currently */
69 if (!test_bit(STATUS_READY, &priv->shrd->status) ||
70 !test_bit(STATUS_GEO_CONFIGURED, &priv->shrd->status) ||
71 !test_bit(STATUS_SCAN_HW, &priv->shrd->status) ||
72 test_bit(STATUS_FW_ERROR, &priv->shrd->status) ||
73 test_bit(STATUS_EXIT_PENDING, &priv->shrd->status))
74 return -EIO;
75
76 ret = iwl_trans_send_cmd(trans(priv), &cmd);
77 if (ret)
78 return ret;
79
80 pkt = (struct iwl_rx_packet *)cmd.reply_page;
81 if (pkt->u.status != CAN_ABORT_STATUS) {
82 /* The scan abort will return 1 for success or
83 * 2 for "failure". A failure condition can be
84 * due to simply not being in an active scan which
85 * can occur if we send the scan abort before we
86 * the microcode has notified us that a scan is
87 * completed. */
88 IWL_DEBUG_SCAN(priv, "SCAN_ABORT ret %d.\n", pkt->u.status);
89 ret = -EIO;
90 }
91
92 iwl_free_pages(priv->shrd, cmd.reply_page);
93 return ret;
94 }
95
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
115 static void iwl_process_scan_complete(struct iwl_priv *priv)
116 {
117 bool aborted;
118
119 lockdep_assert_held(&priv->shrd->mutex);
120
121 if (!test_and_clear_bit(STATUS_SCAN_COMPLETE, &priv->shrd->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->shrd->status);
129 if (aborted)
130 IWL_DEBUG_SCAN(priv, "Aborted scan completed.\n");
131
132 if (!test_and_clear_bit(STATUS_SCANNING, &priv->shrd->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->shrd))
169 return;
170
171 iwlagn_post_scan(priv);
172 }
173
174 void iwl_force_scan_end(struct iwl_priv *priv)
175 {
176 lockdep_assert_held(&priv->shrd->mutex);
177
178 if (!test_bit(STATUS_SCANNING, &priv->shrd->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->shrd->status);
185 clear_bit(STATUS_SCAN_HW, &priv->shrd->status);
186 clear_bit(STATUS_SCAN_ABORTING, &priv->shrd->status);
187 clear_bit(STATUS_SCAN_COMPLETE, &priv->shrd->status);
188 iwl_complete_scan(priv, true);
189 }
190
191 static void iwl_do_scan_abort(struct iwl_priv *priv)
192 {
193 int ret;
194
195 lockdep_assert_held(&priv->shrd->mutex);
196
197 if (!test_bit(STATUS_SCANNING, &priv->shrd->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->shrd->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 */
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 */
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->shrd->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->shrd->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) */
263 static int iwl_rx_reply_scan(struct iwl_priv *priv,
264 struct iwl_rx_mem_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 =
270 (struct iwl_scanreq_notification *)pkt->u.raw;
271
272 IWL_DEBUG_SCAN(priv, "Scan request status = 0x%x\n", notif->status);
273 #endif
274 return 0;
275 }
276
277 /* Service SCAN_START_NOTIFICATION (0x82) */
278 static int iwl_rx_scan_start_notif(struct iwl_priv *priv,
279 struct iwl_rx_mem_buffer *rxb,
280 struct iwl_device_cmd *cmd)
281 {
282 struct iwl_rx_packet *pkt = rxb_addr(rxb);
283 struct iwl_scanstart_notification *notif =
284 (struct iwl_scanstart_notification *)pkt->u.raw;
285 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
286 IWL_DEBUG_SCAN(priv, "Scan start: "
287 "%d [802.11%s] "
288 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
289 notif->channel,
290 notif->band ? "bg" : "a",
291 le32_to_cpu(notif->tsf_high),
292 le32_to_cpu(notif->tsf_low),
293 notif->status, notif->beacon_timer);
294
295 if (priv->scan_type == IWL_SCAN_ROC &&
296 !priv->hw_roc_start_notified) {
297 ieee80211_ready_on_channel(priv->hw);
298 priv->hw_roc_start_notified = true;
299 }
300
301 return 0;
302 }
303
304 /* Service SCAN_RESULTS_NOTIFICATION (0x83) */
305 static int iwl_rx_scan_results_notif(struct iwl_priv *priv,
306 struct iwl_rx_mem_buffer *rxb,
307 struct iwl_device_cmd *cmd)
308 {
309 #ifdef CONFIG_IWLWIFI_DEBUG
310 struct iwl_rx_packet *pkt = rxb_addr(rxb);
311 struct iwl_scanresults_notification *notif =
312 (struct iwl_scanresults_notification *)pkt->u.raw;
313
314 IWL_DEBUG_SCAN(priv, "Scan ch.res: "
315 "%d [802.11%s] "
316 "probe status: %u:%u "
317 "(TSF: 0x%08X:%08X) - %d "
318 "elapsed=%lu usec\n",
319 notif->channel,
320 notif->band ? "bg" : "a",
321 notif->probe_status, notif->num_probe_not_sent,
322 le32_to_cpu(notif->tsf_high),
323 le32_to_cpu(notif->tsf_low),
324 le32_to_cpu(notif->statistics[0]),
325 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf);
326 #endif
327 return 0;
328 }
329
330 /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
331 static int iwl_rx_scan_complete_notif(struct iwl_priv *priv,
332 struct iwl_rx_mem_buffer *rxb,
333 struct iwl_device_cmd *cmd)
334 {
335 struct iwl_rx_packet *pkt = rxb_addr(rxb);
336 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
337
338 IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
339 scan_notif->scanned_channels,
340 scan_notif->tsf_low,
341 scan_notif->tsf_high, scan_notif->status);
342
343 IWL_DEBUG_SCAN(priv, "Scan on %sGHz took %dms\n",
344 (priv->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2",
345 jiffies_to_msecs(jiffies - priv->scan_start));
346
347 /*
348 * When aborting, we run the scan completed background work inline
349 * and the background work must then do nothing. The SCAN_COMPLETE
350 * bit helps implement that logic and thus needs to be set before
351 * queueing the work. Also, since the scan abort waits for SCAN_HW
352 * to clear, we need to set SCAN_COMPLETE before clearing SCAN_HW
353 * to avoid a race there.
354 */
355 set_bit(STATUS_SCAN_COMPLETE, &priv->shrd->status);
356 clear_bit(STATUS_SCAN_HW, &priv->shrd->status);
357 queue_work(priv->workqueue, &priv->scan_completed);
358
359 if (priv->iw_mode != NL80211_IFTYPE_ADHOC &&
360 iwl_advanced_bt_coexist(priv) &&
361 priv->bt_status != scan_notif->bt_status) {
362 if (scan_notif->bt_status) {
363 /* BT on */
364 if (!priv->bt_ch_announce)
365 priv->bt_traffic_load =
366 IWL_BT_COEX_TRAFFIC_LOAD_HIGH;
367 /*
368 * otherwise, no traffic load information provided
369 * no changes made
370 */
371 } else {
372 /* BT off */
373 priv->bt_traffic_load =
374 IWL_BT_COEX_TRAFFIC_LOAD_NONE;
375 }
376 priv->bt_status = scan_notif->bt_status;
377 queue_work(priv->workqueue,
378 &priv->bt_traffic_change_work);
379 }
380 return 0;
381 }
382
383 void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
384 {
385 /* scan handlers */
386 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
387 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
388 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
389 iwl_rx_scan_results_notif;
390 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
391 iwl_rx_scan_complete_notif;
392 }
393
394 static u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
395 enum ieee80211_band band, u8 n_probes)
396 {
397 if (band == IEEE80211_BAND_5GHZ)
398 return IWL_ACTIVE_DWELL_TIME_52 +
399 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
400 else
401 return IWL_ACTIVE_DWELL_TIME_24 +
402 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
403 }
404
405 static u16 iwl_limit_dwell(struct iwl_priv *priv, u16 dwell_time)
406 {
407 struct iwl_rxon_context *ctx;
408
409 /*
410 * If we're associated, we clamp the dwell time 98%
411 * of the smallest beacon interval (minus 2 * channel
412 * tune time)
413 */
414 for_each_context(priv, ctx) {
415 u16 value;
416
417 switch (ctx->staging.dev_type) {
418 case RXON_DEV_TYPE_P2P:
419 /* no timing constraints */
420 continue;
421 case RXON_DEV_TYPE_ESS:
422 default:
423 /* timing constraints if associated */
424 if (!iwl_is_associated_ctx(ctx))
425 continue;
426 break;
427 case RXON_DEV_TYPE_CP:
428 case RXON_DEV_TYPE_2STA:
429 /*
430 * These seem to always have timers for TBTT
431 * active in uCode even when not associated yet.
432 */
433 break;
434 }
435
436 value = ctx->beacon_int;
437 if (!value)
438 value = IWL_PASSIVE_DWELL_BASE;
439 value = (value * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
440 dwell_time = min(value, dwell_time);
441 }
442
443 return dwell_time;
444 }
445
446 static u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
447 enum ieee80211_band band)
448 {
449 u16 passive = (band == IEEE80211_BAND_2GHZ) ?
450 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
451 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
452
453 return iwl_limit_dwell(priv, passive);
454 }
455
456 static int iwl_get_single_channel_for_scan(struct iwl_priv *priv,
457 struct ieee80211_vif *vif,
458 enum ieee80211_band band,
459 struct iwl_scan_channel *scan_ch)
460 {
461 const struct ieee80211_supported_band *sband;
462 u16 passive_dwell = 0;
463 u16 active_dwell = 0;
464 int added = 0;
465 u16 channel = 0;
466
467 sband = iwl_get_hw_mode(priv, band);
468 if (!sband) {
469 IWL_ERR(priv, "invalid band\n");
470 return added;
471 }
472
473 active_dwell = iwl_get_active_dwell_time(priv, band, 0);
474 passive_dwell = iwl_get_passive_dwell_time(priv, band);
475
476 if (passive_dwell <= active_dwell)
477 passive_dwell = active_dwell + 1;
478
479 channel = iwl_get_single_channel_number(priv, band);
480 if (channel) {
481 scan_ch->channel = cpu_to_le16(channel);
482 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
483 scan_ch->active_dwell = cpu_to_le16(active_dwell);
484 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
485 /* Set txpower levels to defaults */
486 scan_ch->dsp_atten = 110;
487 if (band == IEEE80211_BAND_5GHZ)
488 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
489 else
490 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
491 added++;
492 } else
493 IWL_ERR(priv, "no valid channel found\n");
494 return added;
495 }
496
497 static int iwl_get_channels_for_scan(struct iwl_priv *priv,
498 struct ieee80211_vif *vif,
499 enum ieee80211_band band,
500 u8 is_active, u8 n_probes,
501 struct iwl_scan_channel *scan_ch)
502 {
503 struct ieee80211_channel *chan;
504 const struct ieee80211_supported_band *sband;
505 const struct iwl_channel_info *ch_info;
506 u16 passive_dwell = 0;
507 u16 active_dwell = 0;
508 int added, i;
509 u16 channel;
510
511 sband = iwl_get_hw_mode(priv, band);
512 if (!sband)
513 return 0;
514
515 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
516 passive_dwell = iwl_get_passive_dwell_time(priv, band);
517
518 if (passive_dwell <= active_dwell)
519 passive_dwell = active_dwell + 1;
520
521 for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) {
522 chan = priv->scan_request->channels[i];
523
524 if (chan->band != band)
525 continue;
526
527 channel = chan->hw_value;
528 scan_ch->channel = cpu_to_le16(channel);
529
530 ch_info = iwl_get_channel_info(priv, band, channel);
531 if (!is_channel_valid(ch_info)) {
532 IWL_DEBUG_SCAN(priv,
533 "Channel %d is INVALID for this band.\n",
534 channel);
535 continue;
536 }
537
538 if (!is_active || is_channel_passive(ch_info) ||
539 (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN))
540 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
541 else
542 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
543
544 if (n_probes)
545 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
546
547 scan_ch->active_dwell = cpu_to_le16(active_dwell);
548 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
549
550 /* Set txpower levels to defaults */
551 scan_ch->dsp_atten = 110;
552
553 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
554 * power level:
555 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
556 */
557 if (band == IEEE80211_BAND_5GHZ)
558 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
559 else
560 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
561
562 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n",
563 channel, le32_to_cpu(scan_ch->type),
564 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
565 "ACTIVE" : "PASSIVE",
566 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
567 active_dwell : passive_dwell);
568
569 scan_ch++;
570 added++;
571 }
572
573 IWL_DEBUG_SCAN(priv, "total channels to scan %d\n", added);
574 return added;
575 }
576
577 static int iwlagn_request_scan(struct iwl_priv *priv, struct ieee80211_vif *vif)
578 {
579 struct iwl_host_cmd cmd = {
580 .id = REPLY_SCAN_CMD,
581 .len = { sizeof(struct iwl_scan_cmd), },
582 .flags = CMD_SYNC,
583 };
584 struct iwl_scan_cmd *scan;
585 struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
586 u32 rate_flags = 0;
587 u16 cmd_len = 0;
588 u16 rx_chain = 0;
589 enum ieee80211_band band;
590 u8 n_probes = 0;
591 u8 rx_ant = hw_params(priv).valid_rx_ant;
592 u8 rate;
593 bool is_active = false;
594 int chan_mod;
595 u8 active_chains;
596 u8 scan_tx_antennas = hw_params(priv).valid_tx_ant;
597 int ret;
598
599 lockdep_assert_held(&priv->shrd->mutex);
600
601 if (vif)
602 ctx = iwl_rxon_ctx_from_vif(vif);
603
604 if (!priv->scan_cmd) {
605 priv->scan_cmd = kmalloc(sizeof(struct iwl_scan_cmd) +
606 IWL_MAX_SCAN_SIZE, GFP_KERNEL);
607 if (!priv->scan_cmd) {
608 IWL_DEBUG_SCAN(priv,
609 "fail to allocate memory for scan\n");
610 return -ENOMEM;
611 }
612 }
613 scan = priv->scan_cmd;
614 memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE);
615
616 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
617 scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
618
619 if (priv->scan_type != IWL_SCAN_ROC &&
620 iwl_is_any_associated(priv)) {
621 u16 interval = 0;
622 u32 extra;
623 u32 suspend_time = 100;
624 u32 scan_suspend_time = 100;
625
626 IWL_DEBUG_INFO(priv, "Scanning while associated...\n");
627 switch (priv->scan_type) {
628 case IWL_SCAN_ROC:
629 WARN_ON(1);
630 break;
631 case IWL_SCAN_RADIO_RESET:
632 interval = 0;
633 break;
634 case IWL_SCAN_NORMAL:
635 interval = vif->bss_conf.beacon_int;
636 break;
637 }
638
639 scan->suspend_time = 0;
640 scan->max_out_time = cpu_to_le32(200 * 1024);
641 if (!interval)
642 interval = suspend_time;
643
644 extra = (suspend_time / interval) << 22;
645 scan_suspend_time = (extra |
646 ((suspend_time % interval) * 1024));
647 scan->suspend_time = cpu_to_le32(scan_suspend_time);
648 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n",
649 scan_suspend_time, interval);
650 } else if (priv->scan_type == IWL_SCAN_ROC) {
651 scan->suspend_time = 0;
652 scan->max_out_time = 0;
653 scan->quiet_time = 0;
654 scan->quiet_plcp_th = 0;
655 }
656
657 switch (priv->scan_type) {
658 case IWL_SCAN_RADIO_RESET:
659 IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n");
660 break;
661 case IWL_SCAN_NORMAL:
662 if (priv->scan_request->n_ssids) {
663 int i, p = 0;
664 IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
665 for (i = 0; i < priv->scan_request->n_ssids; i++) {
666 /* always does wildcard anyway */
667 if (!priv->scan_request->ssids[i].ssid_len)
668 continue;
669 scan->direct_scan[p].id = WLAN_EID_SSID;
670 scan->direct_scan[p].len =
671 priv->scan_request->ssids[i].ssid_len;
672 memcpy(scan->direct_scan[p].ssid,
673 priv->scan_request->ssids[i].ssid,
674 priv->scan_request->ssids[i].ssid_len);
675 n_probes++;
676 p++;
677 }
678 is_active = true;
679 } else
680 IWL_DEBUG_SCAN(priv, "Start passive scan.\n");
681 break;
682 case IWL_SCAN_ROC:
683 IWL_DEBUG_SCAN(priv, "Start ROC scan.\n");
684 break;
685 }
686
687 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
688 scan->tx_cmd.sta_id = ctx->bcast_sta_id;
689 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
690
691 switch (priv->scan_band) {
692 case IEEE80211_BAND_2GHZ:
693 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
694 chan_mod = le32_to_cpu(
695 priv->contexts[IWL_RXON_CTX_BSS].active.flags &
696 RXON_FLG_CHANNEL_MODE_MSK)
697 >> RXON_FLG_CHANNEL_MODE_POS;
698 if ((priv->scan_request && priv->scan_request->no_cck) ||
699 chan_mod == CHANNEL_MODE_PURE_40) {
700 rate = IWL_RATE_6M_PLCP;
701 } else {
702 rate = IWL_RATE_1M_PLCP;
703 rate_flags = RATE_MCS_CCK_MSK;
704 }
705 /*
706 * Internal scans are passive, so we can indiscriminately set
707 * the BT ignore flag on 2.4 GHz since it applies to TX only.
708 */
709 if (cfg(priv)->bt_params &&
710 cfg(priv)->bt_params->advanced_bt_coexist)
711 scan->tx_cmd.tx_flags |= TX_CMD_FLG_IGNORE_BT;
712 break;
713 case IEEE80211_BAND_5GHZ:
714 rate = IWL_RATE_6M_PLCP;
715 break;
716 default:
717 IWL_WARN(priv, "Invalid scan band\n");
718 return -EIO;
719 }
720
721 /*
722 * If active scanning is requested but a certain channel is
723 * marked passive, we can do active scanning if we detect
724 * transmissions.
725 *
726 * There is an issue with some firmware versions that triggers
727 * a sysassert on a "good CRC threshold" of zero (== disabled),
728 * on a radar channel even though this means that we should NOT
729 * send probes.
730 *
731 * The "good CRC threshold" is the number of frames that we
732 * need to receive during our dwell time on a channel before
733 * sending out probes -- setting this to a huge value will
734 * mean we never reach it, but at the same time work around
735 * the aforementioned issue. Thus use IWL_GOOD_CRC_TH_NEVER
736 * here instead of IWL_GOOD_CRC_TH_DISABLED.
737 *
738 * This was fixed in later versions along with some other
739 * scan changes, and the threshold behaves as a flag in those
740 * versions.
741 */
742 if (priv->new_scan_threshold_behaviour)
743 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
744 IWL_GOOD_CRC_TH_DISABLED;
745 else
746 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
747 IWL_GOOD_CRC_TH_NEVER;
748
749 band = priv->scan_band;
750
751 if (cfg(priv)->scan_rx_antennas[band])
752 rx_ant = cfg(priv)->scan_rx_antennas[band];
753
754 if (band == IEEE80211_BAND_2GHZ &&
755 cfg(priv)->bt_params &&
756 cfg(priv)->bt_params->advanced_bt_coexist) {
757 /* transmit 2.4 GHz probes only on first antenna */
758 scan_tx_antennas = first_antenna(scan_tx_antennas);
759 }
760
761 priv->scan_tx_ant[band] = iwl_toggle_tx_ant(priv,
762 priv->scan_tx_ant[band],
763 scan_tx_antennas);
764 rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]);
765 scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags);
766
767 /* In power save mode use one chain, otherwise use all chains */
768 if (test_bit(STATUS_POWER_PMI, &priv->shrd->status)) {
769 /* rx_ant has been set to all valid chains previously */
770 active_chains = rx_ant &
771 ((u8)(priv->chain_noise_data.active_chains));
772 if (!active_chains)
773 active_chains = rx_ant;
774
775 IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n",
776 priv->chain_noise_data.active_chains);
777
778 rx_ant = first_antenna(active_chains);
779 }
780 if (cfg(priv)->bt_params &&
781 cfg(priv)->bt_params->advanced_bt_coexist &&
782 priv->bt_full_concurrent) {
783 /* operated as 1x1 in full concurrency mode */
784 rx_ant = first_antenna(rx_ant);
785 }
786
787 /* MIMO is not used here, but value is required */
788 rx_chain |=
789 hw_params(priv).valid_rx_ant << RXON_RX_CHAIN_VALID_POS;
790 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS;
791 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS;
792 rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS;
793 scan->rx_chain = cpu_to_le16(rx_chain);
794 switch (priv->scan_type) {
795 case IWL_SCAN_NORMAL:
796 cmd_len = iwl_fill_probe_req(priv,
797 (struct ieee80211_mgmt *)scan->data,
798 vif->addr,
799 priv->scan_request->ie,
800 priv->scan_request->ie_len,
801 IWL_MAX_SCAN_SIZE - sizeof(*scan));
802 break;
803 case IWL_SCAN_RADIO_RESET:
804 case IWL_SCAN_ROC:
805 /* use bcast addr, will not be transmitted but must be valid */
806 cmd_len = iwl_fill_probe_req(priv,
807 (struct ieee80211_mgmt *)scan->data,
808 iwl_bcast_addr, NULL, 0,
809 IWL_MAX_SCAN_SIZE - sizeof(*scan));
810 break;
811 default:
812 BUG();
813 }
814 scan->tx_cmd.len = cpu_to_le16(cmd_len);
815
816 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
817 RXON_FILTER_BCON_AWARE_MSK);
818
819 switch (priv->scan_type) {
820 case IWL_SCAN_RADIO_RESET:
821 scan->channel_count =
822 iwl_get_single_channel_for_scan(priv, vif, band,
823 (void *)&scan->data[cmd_len]);
824 break;
825 case IWL_SCAN_NORMAL:
826 scan->channel_count =
827 iwl_get_channels_for_scan(priv, vif, band,
828 is_active, n_probes,
829 (void *)&scan->data[cmd_len]);
830 break;
831 case IWL_SCAN_ROC: {
832 struct iwl_scan_channel *scan_ch;
833 int n_chan, i;
834 u16 dwell;
835
836 dwell = iwl_limit_dwell(priv, priv->hw_roc_duration);
837 n_chan = DIV_ROUND_UP(priv->hw_roc_duration, dwell);
838
839 scan->channel_count = n_chan;
840
841 scan_ch = (void *)&scan->data[cmd_len];
842
843 for (i = 0; i < n_chan; i++) {
844 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
845 scan_ch->channel =
846 cpu_to_le16(priv->hw_roc_channel->hw_value);
847
848 if (i == n_chan - 1)
849 dwell = priv->hw_roc_duration - i * dwell;
850
851 scan_ch->active_dwell =
852 scan_ch->passive_dwell = cpu_to_le16(dwell);
853
854 /* Set txpower levels to defaults */
855 scan_ch->dsp_atten = 110;
856
857 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
858 * power level:
859 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
860 */
861 if (priv->hw_roc_channel->band == IEEE80211_BAND_5GHZ)
862 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
863 else
864 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
865
866 scan_ch++;
867 }
868 }
869
870 break;
871 }
872
873 if (scan->channel_count == 0) {
874 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
875 return -EIO;
876 }
877
878 cmd.len[0] += le16_to_cpu(scan->tx_cmd.len) +
879 scan->channel_count * sizeof(struct iwl_scan_channel);
880 cmd.data[0] = scan;
881 cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
882 scan->len = cpu_to_le16(cmd.len[0]);
883
884 /* set scan bit here for PAN params */
885 set_bit(STATUS_SCAN_HW, &priv->shrd->status);
886
887 ret = iwlagn_set_pan_params(priv);
888 if (ret)
889 return ret;
890
891 ret = iwl_trans_send_cmd(trans(priv), &cmd);
892 if (ret) {
893 clear_bit(STATUS_SCAN_HW, &priv->shrd->status);
894 iwlagn_set_pan_params(priv);
895 }
896
897 return ret;
898 }
899
900 void iwl_init_scan_params(struct iwl_priv *priv)
901 {
902 u8 ant_idx = fls(hw_params(priv).valid_tx_ant) - 1;
903 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
904 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
905 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
906 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
907 }
908
909 int __must_check iwl_scan_initiate(struct iwl_priv *priv,
910 struct ieee80211_vif *vif,
911 enum iwl_scan_type scan_type,
912 enum ieee80211_band band)
913 {
914 int ret;
915
916 lockdep_assert_held(&priv->shrd->mutex);
917
918 cancel_delayed_work(&priv->scan_check);
919
920 if (!iwl_is_ready_rf(priv->shrd)) {
921 IWL_WARN(priv, "Request scan called when driver not ready.\n");
922 return -EIO;
923 }
924
925 if (test_bit(STATUS_SCAN_HW, &priv->shrd->status)) {
926 IWL_DEBUG_SCAN(priv,
927 "Multiple concurrent scan requests in parallel.\n");
928 return -EBUSY;
929 }
930
931 if (test_bit(STATUS_SCAN_ABORTING, &priv->shrd->status)) {
932 IWL_DEBUG_SCAN(priv, "Scan request while abort pending.\n");
933 return -EBUSY;
934 }
935
936 IWL_DEBUG_SCAN(priv, "Starting %sscan...\n",
937 scan_type == IWL_SCAN_NORMAL ? "" :
938 scan_type == IWL_SCAN_ROC ? "remain-on-channel " :
939 "internal short ");
940
941 set_bit(STATUS_SCANNING, &priv->shrd->status);
942 priv->scan_type = scan_type;
943 priv->scan_start = jiffies;
944 priv->scan_band = band;
945
946 ret = iwlagn_request_scan(priv, vif);
947 if (ret) {
948 clear_bit(STATUS_SCANNING, &priv->shrd->status);
949 priv->scan_type = IWL_SCAN_NORMAL;
950 return ret;
951 }
952
953 queue_delayed_work(priv->workqueue, &priv->scan_check,
954 IWL_SCAN_CHECK_WATCHDOG);
955
956 return 0;
957 }
958
959
960 /*
961 * internal short scan, this function should only been called while associated.
962 * It will reset and tune the radio to prevent possible RF related problem
963 */
964 void iwl_internal_short_hw_scan(struct iwl_priv *priv)
965 {
966 queue_work(priv->workqueue, &priv->start_internal_scan);
967 }
968
969 static void iwl_bg_start_internal_scan(struct work_struct *work)
970 {
971 struct iwl_priv *priv =
972 container_of(work, struct iwl_priv, start_internal_scan);
973
974 IWL_DEBUG_SCAN(priv, "Start internal scan\n");
975
976 mutex_lock(&priv->shrd->mutex);
977
978 if (priv->scan_type == IWL_SCAN_RADIO_RESET) {
979 IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n");
980 goto unlock;
981 }
982
983 if (test_bit(STATUS_SCANNING, &priv->shrd->status)) {
984 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
985 goto unlock;
986 }
987
988 if (iwl_scan_initiate(priv, NULL, IWL_SCAN_RADIO_RESET, priv->band))
989 IWL_DEBUG_SCAN(priv, "failed to start internal short scan\n");
990 unlock:
991 mutex_unlock(&priv->shrd->mutex);
992 }
993
994 static void iwl_bg_scan_check(struct work_struct *data)
995 {
996 struct iwl_priv *priv =
997 container_of(data, struct iwl_priv, scan_check.work);
998
999 IWL_DEBUG_SCAN(priv, "Scan check work\n");
1000
1001 /* Since we are here firmware does not finish scan and
1002 * most likely is in bad shape, so we don't bother to
1003 * send abort command, just force scan complete to mac80211 */
1004 mutex_lock(&priv->shrd->mutex);
1005 iwl_force_scan_end(priv);
1006 mutex_unlock(&priv->shrd->mutex);
1007 }
1008
1009 /**
1010 * iwl_fill_probe_req - fill in all required fields and IE for probe request
1011 */
1012
1013 u16 iwl_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame,
1014 const u8 *ta, const u8 *ies, int ie_len, int left)
1015 {
1016 int len = 0;
1017 u8 *pos = NULL;
1018
1019 /* Make sure there is enough space for the probe request,
1020 * two mandatory IEs and the data */
1021 left -= 24;
1022 if (left < 0)
1023 return 0;
1024
1025 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
1026 memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
1027 memcpy(frame->sa, ta, ETH_ALEN);
1028 memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
1029 frame->seq_ctrl = 0;
1030
1031 len += 24;
1032
1033 /* ...next IE... */
1034 pos = &frame->u.probe_req.variable[0];
1035
1036 /* fill in our indirect SSID IE */
1037 left -= 2;
1038 if (left < 0)
1039 return 0;
1040 *pos++ = WLAN_EID_SSID;
1041 *pos++ = 0;
1042
1043 len += 2;
1044
1045 if (WARN_ON(left < ie_len))
1046 return len;
1047
1048 if (ies && ie_len) {
1049 memcpy(pos, ies, ie_len);
1050 len += ie_len;
1051 }
1052
1053 return (u16)len;
1054 }
1055
1056 static void iwl_bg_abort_scan(struct work_struct *work)
1057 {
1058 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
1059
1060 IWL_DEBUG_SCAN(priv, "Abort scan work\n");
1061
1062 /* We keep scan_check work queued in case when firmware will not
1063 * report back scan completed notification */
1064 mutex_lock(&priv->shrd->mutex);
1065 iwl_scan_cancel_timeout(priv, 200);
1066 mutex_unlock(&priv->shrd->mutex);
1067 }
1068
1069 static void iwl_bg_scan_completed(struct work_struct *work)
1070 {
1071 struct iwl_priv *priv =
1072 container_of(work, struct iwl_priv, scan_completed);
1073
1074 mutex_lock(&priv->shrd->mutex);
1075 iwl_process_scan_complete(priv);
1076 mutex_unlock(&priv->shrd->mutex);
1077 }
1078
1079 void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
1080 {
1081 INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
1082 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
1083 INIT_WORK(&priv->start_internal_scan, iwl_bg_start_internal_scan);
1084 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
1085 }
1086
1087 void iwl_cancel_scan_deferred_work(struct iwl_priv *priv)
1088 {
1089 cancel_work_sync(&priv->start_internal_scan);
1090 cancel_work_sync(&priv->abort_scan);
1091 cancel_work_sync(&priv->scan_completed);
1092
1093 if (cancel_delayed_work_sync(&priv->scan_check)) {
1094 mutex_lock(&priv->shrd->mutex);
1095 iwl_force_scan_end(priv);
1096 mutex_unlock(&priv->shrd->mutex);
1097 }
1098 }
Linux kernel - Deliverables
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