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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / net / wireless / intel / iwlwifi / dvm / scan.c
blob1d8590046ff7d8a8dd174f3616a5cd0c19cf251b
1 // SPDX-License-Identifier: GPL-2.0-only
2 /******************************************************************************
3 *
4 * Copyright(c) 2008 - 2014 Intel Corporation. All rights reserved.
5 * Copyright(c) 2018 Intel Corporation
6 *
7 * Contact Information:
8 * Intel Linux Wireless <linuxwifi@intel.com>
9 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
10 *****************************************************************************/
11 #include <linux/slab.h>
12 #include <linux/types.h>
13 #include <linux/etherdevice.h>
14 #include <net/mac80211.h>
15
16 #include "dev.h"
17 #include "agn.h"
18
19 /* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
20 * sending probe req. This should be set long enough to hear probe responses
21 * from more than one AP. */
22 #define IWL_ACTIVE_DWELL_TIME_24 (30) /* all times in msec */
23 #define IWL_ACTIVE_DWELL_TIME_52 (20)
24
25 #define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3)
26 #define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2)
27
28 /* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
29 * Must be set longer than active dwell time.
30 * For the most reliable scan, set > AP beacon interval (typically 100msec). */
31 #define IWL_PASSIVE_DWELL_TIME_24 (20) /* all times in msec */
32 #define IWL_PASSIVE_DWELL_TIME_52 (10)
33 #define IWL_PASSIVE_DWELL_BASE (100)
34 #define IWL_CHANNEL_TUNE_TIME 5
35 #define MAX_SCAN_CHANNEL 50
36
37 /* For reset radio, need minimal dwell time only */
38 #define IWL_RADIO_RESET_DWELL_TIME 5
39
40 static int iwl_send_scan_abort(struct iwl_priv *priv)
41 {
42 int ret;
43 struct iwl_host_cmd cmd = {
44 .id = REPLY_SCAN_ABORT_CMD,
45 .flags = CMD_WANT_SKB,
46 };
47 __le32 *status;
48
49 /* Exit instantly with error when device is not ready
50 * to receive scan abort command or it does not perform
51 * hardware scan currently */
52 if (!test_bit(STATUS_READY, &priv->status) ||
53 !test_bit(STATUS_SCAN_HW, &priv->status) ||
54 test_bit(STATUS_FW_ERROR, &priv->status))
55 return -EIO;
56
57 ret = iwl_dvm_send_cmd(priv, &cmd);
58 if (ret)
59 return ret;
60
61 status = (void *)cmd.resp_pkt->data;
62 if (*status != CAN_ABORT_STATUS) {
63 /* The scan abort will return 1 for success or
64 * 2 for "failure". A failure condition can be
65 * due to simply not being in an active scan which
66 * can occur if we send the scan abort before we
67 * the microcode has notified us that a scan is
68 * completed. */
69 IWL_DEBUG_SCAN(priv, "SCAN_ABORT ret %d.\n",
70 le32_to_cpu(*status));
71 ret = -EIO;
72 }
73
74 iwl_free_resp(&cmd);
75 return ret;
76 }
77
78 static void iwl_complete_scan(struct iwl_priv *priv, bool aborted)
79 {
80 struct cfg80211_scan_info info = {
81 .aborted = aborted,
82 };
83
84 /* check if scan was requested from mac80211 */
85 if (priv->scan_request) {
86 IWL_DEBUG_SCAN(priv, "Complete scan in mac80211\n");
87 ieee80211_scan_completed(priv->hw, &info);
88 }
89
90 priv->scan_type = IWL_SCAN_NORMAL;
91 priv->scan_vif = NULL;
92 priv->scan_request = NULL;
93 }
94
95 static void iwl_process_scan_complete(struct iwl_priv *priv)
96 {
97 bool aborted;
98
99 lockdep_assert_held(&priv->mutex);
100
101 if (!test_and_clear_bit(STATUS_SCAN_COMPLETE, &priv->status))
102 return;
103
104 IWL_DEBUG_SCAN(priv, "Completed scan.\n");
105
106 cancel_delayed_work(&priv->scan_check);
107
108 aborted = test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->status);
109 if (aborted)
110 IWL_DEBUG_SCAN(priv, "Aborted scan completed.\n");
111
112 if (!test_and_clear_bit(STATUS_SCANNING, &priv->status)) {
113 IWL_DEBUG_SCAN(priv, "Scan already completed.\n");
114 goto out_settings;
115 }
116
117 if (priv->scan_type != IWL_SCAN_NORMAL && !aborted) {
118 int err;
119
120 /* Check if mac80211 requested scan during our internal scan */
121 if (priv->scan_request == NULL)
122 goto out_complete;
123
124 /* If so request a new scan */
125 err = iwl_scan_initiate(priv, priv->scan_vif, IWL_SCAN_NORMAL,
126 priv->scan_request->channels[0]->band);
127 if (err) {
128 IWL_DEBUG_SCAN(priv,
129 "failed to initiate pending scan: %d\n", err);
130 aborted = true;
131 goto out_complete;
132 }
133
134 return;
135 }
136
137 out_complete:
138 iwl_complete_scan(priv, aborted);
139
140 out_settings:
141 /* Can we still talk to firmware ? */
142 if (!iwl_is_ready_rf(priv))
143 return;
144
145 iwlagn_post_scan(priv);
146 }
147
148 void iwl_force_scan_end(struct iwl_priv *priv)
149 {
150 lockdep_assert_held(&priv->mutex);
151
152 if (!test_bit(STATUS_SCANNING, &priv->status)) {
153 IWL_DEBUG_SCAN(priv, "Forcing scan end while not scanning\n");
154 return;
155 }
156
157 IWL_DEBUG_SCAN(priv, "Forcing scan end\n");
158 clear_bit(STATUS_SCANNING, &priv->status);
159 clear_bit(STATUS_SCAN_HW, &priv->status);
160 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
161 clear_bit(STATUS_SCAN_COMPLETE, &priv->status);
162 iwl_complete_scan(priv, true);
163 }
164
165 static void iwl_do_scan_abort(struct iwl_priv *priv)
166 {
167 int ret;
168
169 lockdep_assert_held(&priv->mutex);
170
171 if (!test_bit(STATUS_SCANNING, &priv->status)) {
172 IWL_DEBUG_SCAN(priv, "Not performing scan to abort\n");
173 return;
174 }
175
176 if (test_and_set_bit(STATUS_SCAN_ABORTING, &priv->status)) {
177 IWL_DEBUG_SCAN(priv, "Scan abort in progress\n");
178 return;
179 }
180
181 ret = iwl_send_scan_abort(priv);
182 if (ret) {
183 IWL_DEBUG_SCAN(priv, "Send scan abort failed %d\n", ret);
184 iwl_force_scan_end(priv);
185 } else
186 IWL_DEBUG_SCAN(priv, "Successfully send scan abort\n");
187 }
188
189 /**
190 * iwl_scan_cancel - Cancel any currently executing HW scan
191 */
192 int iwl_scan_cancel(struct iwl_priv *priv)
193 {
194 IWL_DEBUG_SCAN(priv, "Queuing abort scan\n");
195 queue_work(priv->workqueue, &priv->abort_scan);
196 return 0;
197 }
198
199 /**
200 * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
201 * @ms: amount of time to wait (in milliseconds) for scan to abort
202 *
203 */
204 void iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
205 {
206 unsigned long timeout = jiffies + msecs_to_jiffies(ms);
207
208 lockdep_assert_held(&priv->mutex);
209
210 IWL_DEBUG_SCAN(priv, "Scan cancel timeout\n");
211
212 iwl_do_scan_abort(priv);
213
214 while (time_before_eq(jiffies, timeout)) {
215 if (!test_bit(STATUS_SCAN_HW, &priv->status))
216 goto finished;
217 msleep(20);
218 }
219
220 return;
221
222 finished:
223 /*
224 * Now STATUS_SCAN_HW is clear. This means that the
225 * device finished, but the background work is going
226 * to execute at best as soon as we release the mutex.
227 * Since we need to be able to issue a new scan right
228 * after this function returns, run the complete here.
229 * The STATUS_SCAN_COMPLETE bit will then be cleared
230 * and prevent the background work from "completing"
231 * a possible new scan.
232 */
233 iwl_process_scan_complete(priv);
234 }
235
236 /* Service response to REPLY_SCAN_CMD (0x80) */
237 static void iwl_rx_reply_scan(struct iwl_priv *priv,
238 struct iwl_rx_cmd_buffer *rxb)
239 {
240 #ifdef CONFIG_IWLWIFI_DEBUG
241 struct iwl_rx_packet *pkt = rxb_addr(rxb);
242 struct iwl_scanreq_notification *notif = (void *)pkt->data;
243
244 IWL_DEBUG_SCAN(priv, "Scan request status = 0x%x\n", notif->status);
245 #endif
246 }
247
248 /* Service SCAN_START_NOTIFICATION (0x82) */
249 static void iwl_rx_scan_start_notif(struct iwl_priv *priv,
250 struct iwl_rx_cmd_buffer *rxb)
251 {
252 struct iwl_rx_packet *pkt = rxb_addr(rxb);
253 struct iwl_scanstart_notification *notif = (void *)pkt->data;
254
255 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
256 IWL_DEBUG_SCAN(priv, "Scan start: "
257 "%d [802.11%s] "
258 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
259 notif->channel,
260 notif->band ? "bg" : "a",
261 le32_to_cpu(notif->tsf_high),
262 le32_to_cpu(notif->tsf_low),
263 notif->status, notif->beacon_timer);
264 }
265
266 /* Service SCAN_RESULTS_NOTIFICATION (0x83) */
267 static void iwl_rx_scan_results_notif(struct iwl_priv *priv,
268 struct iwl_rx_cmd_buffer *rxb)
269 {
270 #ifdef CONFIG_IWLWIFI_DEBUG
271 struct iwl_rx_packet *pkt = rxb_addr(rxb);
272 struct iwl_scanresults_notification *notif = (void *)pkt->data;
273
274 IWL_DEBUG_SCAN(priv, "Scan ch.res: "
275 "%d [802.11%s] "
276 "probe status: %u:%u "
277 "(TSF: 0x%08X:%08X) - %d "
278 "elapsed=%lu usec\n",
279 notif->channel,
280 notif->band ? "bg" : "a",
281 notif->probe_status, notif->num_probe_not_sent,
282 le32_to_cpu(notif->tsf_high),
283 le32_to_cpu(notif->tsf_low),
284 le32_to_cpu(notif->statistics[0]),
285 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf);
286 #endif
287 }
288
289 /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
290 static void iwl_rx_scan_complete_notif(struct iwl_priv *priv,
291 struct iwl_rx_cmd_buffer *rxb)
292 {
293 struct iwl_rx_packet *pkt = rxb_addr(rxb);
294 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->data;
295
296 IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
297 scan_notif->scanned_channels,
298 scan_notif->tsf_low,
299 scan_notif->tsf_high, scan_notif->status);
300
301 IWL_DEBUG_SCAN(priv, "Scan on %sGHz took %dms\n",
302 (priv->scan_band == NL80211_BAND_2GHZ) ? "2.4" : "5.2",
303 jiffies_to_msecs(jiffies - priv->scan_start));
304
305 /*
306 * When aborting, we run the scan completed background work inline
307 * and the background work must then do nothing. The SCAN_COMPLETE
308 * bit helps implement that logic and thus needs to be set before
309 * queueing the work. Also, since the scan abort waits for SCAN_HW
310 * to clear, we need to set SCAN_COMPLETE before clearing SCAN_HW
311 * to avoid a race there.
312 */
313 set_bit(STATUS_SCAN_COMPLETE, &priv->status);
314 clear_bit(STATUS_SCAN_HW, &priv->status);
315 queue_work(priv->workqueue, &priv->scan_completed);
316
317 if (priv->iw_mode != NL80211_IFTYPE_ADHOC &&
318 iwl_advanced_bt_coexist(priv) &&
319 priv->bt_status != scan_notif->bt_status) {
320 if (scan_notif->bt_status) {
321 /* BT on */
322 if (!priv->bt_ch_announce)
323 priv->bt_traffic_load =
324 IWL_BT_COEX_TRAFFIC_LOAD_HIGH;
325 /*
326 * otherwise, no traffic load information provided
327 * no changes made
328 */
329 } else {
330 /* BT off */
331 priv->bt_traffic_load =
332 IWL_BT_COEX_TRAFFIC_LOAD_NONE;
333 }
334 priv->bt_status = scan_notif->bt_status;
335 queue_work(priv->workqueue,
336 &priv->bt_traffic_change_work);
337 }
338 }
339
340 void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
341 {
342 /* scan handlers */
343 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
344 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
345 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
346 iwl_rx_scan_results_notif;
347 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
348 iwl_rx_scan_complete_notif;
349 }
350
351 static u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
352 enum nl80211_band band, u8 n_probes)
353 {
354 if (band == NL80211_BAND_5GHZ)
355 return IWL_ACTIVE_DWELL_TIME_52 +
356 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
357 else
358 return IWL_ACTIVE_DWELL_TIME_24 +
359 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
360 }
361
362 static u16 iwl_limit_dwell(struct iwl_priv *priv, u16 dwell_time)
363 {
364 struct iwl_rxon_context *ctx;
365 int limits[NUM_IWL_RXON_CTX] = {};
366 int n_active = 0;
367 u16 limit;
368
369 BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
370
371 /*
372 * If we're associated, we clamp the dwell time 98%
373 * of the beacon interval (minus 2 * channel tune time)
374 * If both contexts are active, we have to restrict to
375 * 1/2 of the minimum of them, because they might be in
376 * lock-step with the time inbetween only half of what
377 * time we'd have in each of them.
378 */
379 for_each_context(priv, ctx) {
380 switch (ctx->staging.dev_type) {
381 case RXON_DEV_TYPE_P2P:
382 /* no timing constraints */
383 continue;
384 case RXON_DEV_TYPE_ESS:
385 default:
386 /* timing constraints if associated */
387 if (!iwl_is_associated_ctx(ctx))
388 continue;
389 break;
390 case RXON_DEV_TYPE_CP:
391 case RXON_DEV_TYPE_2STA:
392 /*
393 * These seem to always have timers for TBTT
394 * active in uCode even when not associated yet.
395 */
396 break;
397 }
398
399 limits[n_active++] = ctx->beacon_int ?: IWL_PASSIVE_DWELL_BASE;
400 }
401
402 switch (n_active) {
403 case 0:
404 return dwell_time;
405 case 2:
406 limit = (limits[1] * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
407 limit /= 2;
408 dwell_time = min(limit, dwell_time);
409 /* fall through */
410 case 1:
411 limit = (limits[0] * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
412 limit /= n_active;
413 return min(limit, dwell_time);
414 default:
415 WARN_ON_ONCE(1);
416 return dwell_time;
417 }
418 }
419
420 static u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
421 enum nl80211_band band)
422 {
423 u16 passive = (band == NL80211_BAND_2GHZ) ?
424 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
425 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
426
427 return iwl_limit_dwell(priv, passive);
428 }
429
430 /* Return valid, unused, channel for a passive scan to reset the RF */
431 static u8 iwl_get_single_channel_number(struct iwl_priv *priv,
432 enum nl80211_band band)
433 {
434 struct ieee80211_supported_band *sband = priv->hw->wiphy->bands[band];
435 struct iwl_rxon_context *ctx;
436 int i;
437
438 for (i = 0; i < sband->n_channels; i++) {
439 bool busy = false;
440
441 for_each_context(priv, ctx) {
442 busy = sband->channels[i].hw_value ==
443 le16_to_cpu(ctx->staging.channel);
444 if (busy)
445 break;
446 }
447
448 if (busy)
449 continue;
450
451 if (!(sband->channels[i].flags & IEEE80211_CHAN_DISABLED))
452 return sband->channels[i].hw_value;
453 }
454
455 return 0;
456 }
457
458 static int iwl_get_channel_for_reset_scan(struct iwl_priv *priv,
459 struct ieee80211_vif *vif,
460 enum nl80211_band band,
461 struct iwl_scan_channel *scan_ch)
462 {
463 const struct ieee80211_supported_band *sband;
464 u16 channel;
465
466 sband = iwl_get_hw_mode(priv, band);
467 if (!sband) {
468 IWL_ERR(priv, "invalid band\n");
469 return 0;
470 }
471
472 channel = iwl_get_single_channel_number(priv, band);
473 if (channel) {
474 scan_ch->channel = cpu_to_le16(channel);
475 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
476 scan_ch->active_dwell =
477 cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME);
478 scan_ch->passive_dwell =
479 cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME);
480 /* Set txpower levels to defaults */
481 scan_ch->dsp_atten = 110;
482 if (band == NL80211_BAND_5GHZ)
483 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
484 else
485 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
486 return 1;
487 }
488
489 IWL_ERR(priv, "no valid channel found\n");
490 return 0;
491 }
492
493 static int iwl_get_channels_for_scan(struct iwl_priv *priv,
494 struct ieee80211_vif *vif,
495 enum nl80211_band band,
496 u8 is_active, u8 n_probes,
497 struct iwl_scan_channel *scan_ch)
498 {
499 struct ieee80211_channel *chan;
500 const struct ieee80211_supported_band *sband;
501 u16 passive_dwell = 0;
502 u16 active_dwell = 0;
503 int added, i;
504 u16 channel;
505
506 sband = iwl_get_hw_mode(priv, band);
507 if (!sband)
508 return 0;
509
510 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
511 passive_dwell = iwl_get_passive_dwell_time(priv, band);
512
513 if (passive_dwell <= active_dwell)
514 passive_dwell = active_dwell + 1;
515
516 for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) {
517 chan = priv->scan_request->channels[i];
518
519 if (chan->band != band)
520 continue;
521
522 channel = chan->hw_value;
523 scan_ch->channel = cpu_to_le16(channel);
524
525 if (!is_active || (chan->flags & IEEE80211_CHAN_NO_IR))
526 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
527 else
528 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
529
530 if (n_probes)
531 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
532
533 scan_ch->active_dwell = cpu_to_le16(active_dwell);
534 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
535
536 /* Set txpower levels to defaults */
537 scan_ch->dsp_atten = 110;
538
539 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
540 * power level:
541 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
542 */
543 if (band == NL80211_BAND_5GHZ)
544 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
545 else
546 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
547
548 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n",
549 channel, le32_to_cpu(scan_ch->type),
550 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
551 "ACTIVE" : "PASSIVE",
552 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
553 active_dwell : passive_dwell);
554
555 scan_ch++;
556 added++;
557 }
558
559 IWL_DEBUG_SCAN(priv, "total channels to scan %d\n", added);
560 return added;
561 }
562
563 /**
564 * iwl_fill_probe_req - fill in all required fields and IE for probe request
565 */
566
567 static u16 iwl_fill_probe_req(struct ieee80211_mgmt *frame, const u8 *ta,
568 const u8 *ies, int ie_len, const u8 *ssid,
569 u8 ssid_len, int left)
570 {
571 int len = 0;
572 u8 *pos = NULL;
573
574 /* Make sure there is enough space for the probe request,
575 * two mandatory IEs and the data */
576 left -= 24;
577 if (left < 0)
578 return 0;
579
580 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
581 eth_broadcast_addr(frame->da);
582 memcpy(frame->sa, ta, ETH_ALEN);
583 eth_broadcast_addr(frame->bssid);
584 frame->seq_ctrl = 0;
585
586 len += 24;
587
588 /* ...next IE... */
589 pos = &frame->u.probe_req.variable[0];
590
591 /* fill in our SSID IE */
592 left -= ssid_len + 2;
593 if (left < 0)
594 return 0;
595 *pos++ = WLAN_EID_SSID;
596 *pos++ = ssid_len;
597 if (ssid && ssid_len) {
598 memcpy(pos, ssid, ssid_len);
599 pos += ssid_len;
600 }
601
602 len += ssid_len + 2;
603
604 if (WARN_ON(left < ie_len))
605 return len;
606
607 if (ies && ie_len) {
608 memcpy(pos, ies, ie_len);
609 len += ie_len;
610 }
611
612 return (u16)len;
613 }
614
615 static int iwlagn_request_scan(struct iwl_priv *priv, struct ieee80211_vif *vif)
616 {
617 struct iwl_host_cmd cmd = {
618 .id = REPLY_SCAN_CMD,
619 .len = { sizeof(struct iwl_scan_cmd), },
620 };
621 struct iwl_scan_cmd *scan;
622 struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
623 u32 rate_flags = 0;
624 u16 cmd_len = 0;
625 u16 rx_chain = 0;
626 enum nl80211_band band;
627 u8 n_probes = 0;
628 u8 rx_ant = priv->nvm_data->valid_rx_ant;
629 u8 rate;
630 bool is_active = false;
631 int chan_mod;
632 u8 active_chains;
633 u8 scan_tx_antennas = priv->nvm_data->valid_tx_ant;
634 int ret;
635 int scan_cmd_size = sizeof(struct iwl_scan_cmd) +
636 MAX_SCAN_CHANNEL * sizeof(struct iwl_scan_channel) +
637 priv->fw->ucode_capa.max_probe_length;
638 const u8 *ssid = NULL;
639 u8 ssid_len = 0;
640
641 if (WARN_ON(priv->scan_type == IWL_SCAN_NORMAL &&
642 (!priv->scan_request ||
643 priv->scan_request->n_channels > MAX_SCAN_CHANNEL)))
644 return -EINVAL;
645
646 lockdep_assert_held(&priv->mutex);
647
648 if (vif)
649 ctx = iwl_rxon_ctx_from_vif(vif);
650
651 if (!priv->scan_cmd) {
652 priv->scan_cmd = kmalloc(scan_cmd_size, GFP_KERNEL);
653 if (!priv->scan_cmd) {
654 IWL_DEBUG_SCAN(priv,
655 "fail to allocate memory for scan\n");
656 return -ENOMEM;
657 }
658 }
659 scan = priv->scan_cmd;
660 memset(scan, 0, scan_cmd_size);
661
662 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
663 scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
664
665 if (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_RADIO_RESET:
674 interval = 0;
675 break;
676 case IWL_SCAN_NORMAL:
677 interval = vif->bss_conf.beacon_int;
678 break;
679 }
680
681 scan->suspend_time = 0;
682 scan->max_out_time = cpu_to_le32(200 * 1024);
683 if (!interval)
684 interval = suspend_time;
685
686 extra = (suspend_time / interval) << 22;
687 scan_suspend_time = (extra |
688 ((suspend_time % interval) * 1024));
689 scan->suspend_time = cpu_to_le32(scan_suspend_time);
690 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n",
691 scan_suspend_time, interval);
692 }
693
694 switch (priv->scan_type) {
695 case IWL_SCAN_RADIO_RESET:
696 IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n");
697 /*
698 * Override quiet time as firmware checks that active
699 * dwell is >= quiet; since we use passive scan it'll
700 * not actually be used.
701 */
702 scan->quiet_time = cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME);
703 break;
704 case IWL_SCAN_NORMAL:
705 if (priv->scan_request->n_ssids) {
706 int i, p = 0;
707 IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
708 /*
709 * The highest priority SSID is inserted to the
710 * probe request template.
711 */
712 ssid_len = priv->scan_request->ssids[0].ssid_len;
713 ssid = priv->scan_request->ssids[0].ssid;
714
715 /*
716 * Invert the order of ssids, the firmware will invert
717 * it back.
718 */
719 for (i = priv->scan_request->n_ssids - 1; i >= 1; i--) {
720 scan->direct_scan[p].id = WLAN_EID_SSID;
721 scan->direct_scan[p].len =
722 priv->scan_request->ssids[i].ssid_len;
723 memcpy(scan->direct_scan[p].ssid,
724 priv->scan_request->ssids[i].ssid,
725 priv->scan_request->ssids[i].ssid_len);
726 n_probes++;
727 p++;
728 }
729 is_active = true;
730 } else
731 IWL_DEBUG_SCAN(priv, "Start passive scan.\n");
732 break;
733 }
734
735 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
736 scan->tx_cmd.sta_id = ctx->bcast_sta_id;
737 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
738
739 switch (priv->scan_band) {
740 case NL80211_BAND_2GHZ:
741 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
742 chan_mod = le32_to_cpu(
743 priv->contexts[IWL_RXON_CTX_BSS].active.flags &
744 RXON_FLG_CHANNEL_MODE_MSK)
745 >> RXON_FLG_CHANNEL_MODE_POS;
746 if ((priv->scan_request && priv->scan_request->no_cck) ||
747 chan_mod == CHANNEL_MODE_PURE_40) {
748 rate = IWL_RATE_6M_PLCP;
749 } else {
750 rate = IWL_RATE_1M_PLCP;
751 rate_flags = RATE_MCS_CCK_MSK;
752 }
753 /*
754 * Internal scans are passive, so we can indiscriminately set
755 * the BT ignore flag on 2.4 GHz since it applies to TX only.
756 */
757 if (priv->lib->bt_params &&
758 priv->lib->bt_params->advanced_bt_coexist)
759 scan->tx_cmd.tx_flags |= TX_CMD_FLG_IGNORE_BT;
760 break;
761 case NL80211_BAND_5GHZ:
762 rate = IWL_RATE_6M_PLCP;
763 break;
764 default:
765 IWL_WARN(priv, "Invalid scan band\n");
766 return -EIO;
767 }
768
769 /*
770 * If active scanning is requested but a certain channel is
771 * marked passive, we can do active scanning if we detect
772 * transmissions.
773 *
774 * There is an issue with some firmware versions that triggers
775 * a sysassert on a "good CRC threshold" of zero (== disabled),
776 * on a radar channel even though this means that we should NOT
777 * send probes.
778 *
779 * The "good CRC threshold" is the number of frames that we
780 * need to receive during our dwell time on a channel before
781 * sending out probes -- setting this to a huge value will
782 * mean we never reach it, but at the same time work around
783 * the aforementioned issue. Thus use IWL_GOOD_CRC_TH_NEVER
784 * here instead of IWL_GOOD_CRC_TH_DISABLED.
785 *
786 * This was fixed in later versions along with some other
787 * scan changes, and the threshold behaves as a flag in those
788 * versions.
789 */
790 if (priv->new_scan_threshold_behaviour)
791 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
792 IWL_GOOD_CRC_TH_DISABLED;
793 else
794 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
795 IWL_GOOD_CRC_TH_NEVER;
796
797 band = priv->scan_band;
798
799 if (band == NL80211_BAND_2GHZ &&
800 priv->lib->bt_params &&
801 priv->lib->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 /*
813 * In power save mode while associated use one chain,
814 * otherwise use all chains
815 */
816 if (test_bit(STATUS_POWER_PMI, &priv->status) &&
817 !(priv->hw->conf.flags & IEEE80211_CONF_IDLE)) {
818 /* rx_ant has been set to all valid chains previously */
819 active_chains = rx_ant &
820 ((u8)(priv->chain_noise_data.active_chains));
821 if (!active_chains)
822 active_chains = rx_ant;
823
824 IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n",
825 priv->chain_noise_data.active_chains);
826
827 rx_ant = first_antenna(active_chains);
828 }
829 if (priv->lib->bt_params &&
830 priv->lib->bt_params->advanced_bt_coexist &&
831 priv->bt_full_concurrent) {
832 /* operated as 1x1 in full concurrency mode */
833 rx_ant = first_antenna(rx_ant);
834 }
835
836 /* MIMO is not used here, but value is required */
837 rx_chain |=
838 priv->nvm_data->valid_rx_ant << RXON_RX_CHAIN_VALID_POS;
839 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS;
840 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS;
841 rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS;
842 scan->rx_chain = cpu_to_le16(rx_chain);
843 switch (priv->scan_type) {
844 case IWL_SCAN_NORMAL:
845 cmd_len = iwl_fill_probe_req(
846 (struct ieee80211_mgmt *)scan->data,
847 vif->addr,
848 priv->scan_request->ie,
849 priv->scan_request->ie_len,
850 ssid, ssid_len,
851 scan_cmd_size - sizeof(*scan));
852 break;
853 case IWL_SCAN_RADIO_RESET:
854 /* use bcast addr, will not be transmitted but must be valid */
855 cmd_len = iwl_fill_probe_req(
856 (struct ieee80211_mgmt *)scan->data,
857 iwl_bcast_addr, NULL, 0,
858 NULL, 0,
859 scan_cmd_size - sizeof(*scan));
860 break;
861 default:
862 BUG();
863 }
864 scan->tx_cmd.len = cpu_to_le16(cmd_len);
865
866 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
867 RXON_FILTER_BCON_AWARE_MSK);
868
869 switch (priv->scan_type) {
870 case IWL_SCAN_RADIO_RESET:
871 scan->channel_count =
872 iwl_get_channel_for_reset_scan(priv, vif, band,
873 (void *)&scan->data[cmd_len]);
874 break;
875 case IWL_SCAN_NORMAL:
876 scan->channel_count =
877 iwl_get_channels_for_scan(priv, vif, band,
878 is_active, n_probes,
879 (void *)&scan->data[cmd_len]);
880 break;
881 }
882
883 if (scan->channel_count == 0) {
884 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
885 return -EIO;
886 }
887
888 cmd.len[0] += le16_to_cpu(scan->tx_cmd.len) +
889 scan->channel_count * sizeof(struct iwl_scan_channel);
890 cmd.data[0] = scan;
891 cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
892 scan->len = cpu_to_le16(cmd.len[0]);
893
894 /* set scan bit here for PAN params */
895 set_bit(STATUS_SCAN_HW, &priv->status);
896
897 ret = iwlagn_set_pan_params(priv);
898 if (ret) {
899 clear_bit(STATUS_SCAN_HW, &priv->status);
900 return ret;
901 }
902
903 ret = iwl_dvm_send_cmd(priv, &cmd);
904 if (ret) {
905 clear_bit(STATUS_SCAN_HW, &priv->status);
906 iwlagn_set_pan_params(priv);
907 }
908
909 return ret;
910 }
911
912 void iwl_init_scan_params(struct iwl_priv *priv)
913 {
914 u8 ant_idx = fls(priv->nvm_data->valid_tx_ant) - 1;
915 if (!priv->scan_tx_ant[NL80211_BAND_5GHZ])
916 priv->scan_tx_ant[NL80211_BAND_5GHZ] = ant_idx;
917 if (!priv->scan_tx_ant[NL80211_BAND_2GHZ])
918 priv->scan_tx_ant[NL80211_BAND_2GHZ] = ant_idx;
919 }
920
921 int __must_check iwl_scan_initiate(struct iwl_priv *priv,
922 struct ieee80211_vif *vif,
923 enum iwl_scan_type scan_type,
924 enum nl80211_band band)
925 {
926 int ret;
927
928 lockdep_assert_held(&priv->mutex);
929
930 cancel_delayed_work(&priv->scan_check);
931
932 if (!iwl_is_ready_rf(priv)) {
933 IWL_WARN(priv, "Request scan called when driver not ready.\n");
934 return -EIO;
935 }
936
937 if (test_bit(STATUS_SCAN_HW, &priv->status)) {
938 IWL_DEBUG_SCAN(priv,
939 "Multiple concurrent scan requests in parallel.\n");
940 return -EBUSY;
941 }
942
943 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
944 IWL_DEBUG_SCAN(priv, "Scan request while abort pending.\n");
945 return -EBUSY;
946 }
947
948 IWL_DEBUG_SCAN(priv, "Starting %sscan...\n",
949 scan_type == IWL_SCAN_NORMAL ? "" :
950 "internal short ");
951
952 set_bit(STATUS_SCANNING, &priv->status);
953 priv->scan_type = scan_type;
954 priv->scan_start = jiffies;
955 priv->scan_band = band;
956
957 ret = iwlagn_request_scan(priv, vif);
958 if (ret) {
959 clear_bit(STATUS_SCANNING, &priv->status);
960 priv->scan_type = IWL_SCAN_NORMAL;
961 return ret;
962 }
963
964 queue_delayed_work(priv->workqueue, &priv->scan_check,
965 IWL_SCAN_CHECK_WATCHDOG);
966
967 return 0;
968 }
969
970
971 /*
972 * internal short scan, this function should only been called while associated.
973 * It will reset and tune the radio to prevent possible RF related problem
974 */
975 void iwl_internal_short_hw_scan(struct iwl_priv *priv)
976 {
977 queue_work(priv->workqueue, &priv->start_internal_scan);
978 }
979
980 static void iwl_bg_start_internal_scan(struct work_struct *work)
981 {
982 struct iwl_priv *priv =
983 container_of(work, struct iwl_priv, start_internal_scan);
984
985 IWL_DEBUG_SCAN(priv, "Start internal scan\n");
986
987 mutex_lock(&priv->mutex);
988
989 if (priv->scan_type == IWL_SCAN_RADIO_RESET) {
990 IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n");
991 goto unlock;
992 }
993
994 if (test_bit(STATUS_SCANNING, &priv->status)) {
995 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
996 goto unlock;
997 }
998
999 if (iwl_scan_initiate(priv, NULL, IWL_SCAN_RADIO_RESET, priv->band))
1000 IWL_DEBUG_SCAN(priv, "failed to start internal short scan\n");
1001 unlock:
1002 mutex_unlock(&priv->mutex);
1003 }
1004
1005 static void iwl_bg_scan_check(struct work_struct *data)
1006 {
1007 struct iwl_priv *priv =
1008 container_of(data, struct iwl_priv, scan_check.work);
1009
1010 IWL_DEBUG_SCAN(priv, "Scan check work\n");
1011
1012 /* Since we are here firmware does not finish scan and
1013 * most likely is in bad shape, so we don't bother to
1014 * send abort command, just force scan complete to mac80211 */
1015 mutex_lock(&priv->mutex);
1016 iwl_force_scan_end(priv);
1017 mutex_unlock(&priv->mutex);
1018 }
1019
1020 static void iwl_bg_abort_scan(struct work_struct *work)
1021 {
1022 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
1023
1024 IWL_DEBUG_SCAN(priv, "Abort scan work\n");
1025
1026 /* We keep scan_check work queued in case when firmware will not
1027 * report back scan completed notification */
1028 mutex_lock(&priv->mutex);
1029 iwl_scan_cancel_timeout(priv, 200);
1030 mutex_unlock(&priv->mutex);
1031 }
1032
1033 static void iwl_bg_scan_completed(struct work_struct *work)
1034 {
1035 struct iwl_priv *priv =
1036 container_of(work, struct iwl_priv, scan_completed);
1037
1038 mutex_lock(&priv->mutex);
1039 iwl_process_scan_complete(priv);
1040 mutex_unlock(&priv->mutex);
1041 }
1042
1043 void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
1044 {
1045 INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
1046 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
1047 INIT_WORK(&priv->start_internal_scan, iwl_bg_start_internal_scan);
1048 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
1049 }
1050
1051 void iwl_cancel_scan_deferred_work(struct iwl_priv *priv)
1052 {
1053 cancel_work_sync(&priv->start_internal_scan);
1054 cancel_work_sync(&priv->abort_scan);
1055 cancel_work_sync(&priv->scan_completed);
1056
1057 if (cancel_delayed_work_sync(&priv->scan_check)) {
1058 mutex_lock(&priv->mutex);
1059 iwl_force_scan_end(priv);
1060 mutex_unlock(&priv->mutex);
1061 }
1062 }
Linux with added FPC-III support