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Diffstat (limited to 'drivers/net/wireless/iwlwifi/iwl-scan.c')
-rw-r--r--drivers/net/wireless/iwlwifi/iwl-scan.c921
1 files changed, 921 insertions, 0 deletions
diff --git a/drivers/net/wireless/iwlwifi/iwl-scan.c b/drivers/net/wireless/iwlwifi/iwl-scan.c
new file mode 100644
index 000000000000..5ca181f7125d
--- /dev/null
+++ b/drivers/net/wireless/iwlwifi/iwl-scan.c
@@ -0,0 +1,921 @@
1/******************************************************************************
2 *
3 * GPL LICENSE SUMMARY
4 *
5 * Copyright(c) 2008 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 * Tomas Winkler <tomas.winkler@intel.com>
26 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
27 *****************************************************************************/
28#include <net/mac80211.h>
29#include <linux/etherdevice.h>
30
31#include "iwl-eeprom.h"
32#include "iwl-dev.h"
33#include "iwl-core.h"
34#include "iwl-sta.h"
35#include "iwl-io.h"
36#include "iwl-helpers.h"
37
38/* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
39 * sending probe req. This should be set long enough to hear probe responses
40 * from more than one AP. */
41#define IWL_ACTIVE_DWELL_TIME_24 (20) /* all times in msec */
42#define IWL_ACTIVE_DWELL_TIME_52 (10)
43
44/* For faster active scanning, scan will move to the next channel if fewer than
45 * PLCP_QUIET_THRESH packets are heard on this channel within
46 * ACTIVE_QUIET_TIME after sending probe request. This shortens the dwell
47 * time if it's a quiet channel (nothing responded to our probe, and there's
48 * no other traffic).
49 * Disable "quiet" feature by setting PLCP_QUIET_THRESH to 0. */
50#define IWL_PLCP_QUIET_THRESH __constant_cpu_to_le16(1) /* packets */
51#define IWL_ACTIVE_QUIET_TIME __constant_cpu_to_le16(5) /* msec */
52
53/* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
54 * Must be set longer than active dwell time.
55 * For the most reliable scan, set > AP beacon interval (typically 100msec). */
56#define IWL_PASSIVE_DWELL_TIME_24 (20) /* all times in msec */
57#define IWL_PASSIVE_DWELL_TIME_52 (10)
58#define IWL_PASSIVE_DWELL_BASE (100)
59#define IWL_CHANNEL_TUNE_TIME 5
60
61static int scan_tx_ant[3] = {
62 RATE_MCS_ANT_A_MSK, RATE_MCS_ANT_B_MSK, RATE_MCS_ANT_C_MSK
63};
64
65static int iwl_is_empty_essid(const char *essid, int essid_len)
66{
67 /* Single white space is for Linksys APs */
68 if (essid_len == 1 && essid[0] == ' ')
69 return 1;
70
71 /* Otherwise, if the entire essid is 0, we assume it is hidden */
72 while (essid_len) {
73 essid_len--;
74 if (essid[essid_len] != '\0')
75 return 0;
76 }
77
78 return 1;
79}
80
81
82
83const char *iwl_escape_essid(const char *essid, u8 essid_len)
84{
85 static char escaped[IW_ESSID_MAX_SIZE * 2 + 1];
86 const char *s = essid;
87 char *d = escaped;
88
89 if (iwl_is_empty_essid(essid, essid_len)) {
90 memcpy(escaped, "<hidden>", sizeof("<hidden>"));
91 return escaped;
92 }
93
94 essid_len = min(essid_len, (u8) IW_ESSID_MAX_SIZE);
95 while (essid_len--) {
96 if (*s == '\0') {
97 *d++ = '\\';
98 *d++ = '0';
99 s++;
100 } else
101 *d++ = *s++;
102 }
103 *d = '\0';
104 return escaped;
105}
106EXPORT_SYMBOL(iwl_escape_essid);
107
108/**
109 * iwl_scan_cancel - Cancel any currently executing HW scan
110 *
111 * NOTE: priv->mutex is not required before calling this function
112 */
113int iwl_scan_cancel(struct iwl_priv *priv)
114{
115 if (!test_bit(STATUS_SCAN_HW, &priv->status)) {
116 clear_bit(STATUS_SCANNING, &priv->status);
117 return 0;
118 }
119
120 if (test_bit(STATUS_SCANNING, &priv->status)) {
121 if (!test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
122 IWL_DEBUG_SCAN("Queuing scan abort.\n");
123 set_bit(STATUS_SCAN_ABORTING, &priv->status);
124 queue_work(priv->workqueue, &priv->abort_scan);
125
126 } else
127 IWL_DEBUG_SCAN("Scan abort already in progress.\n");
128
129 return test_bit(STATUS_SCANNING, &priv->status);
130 }
131
132 return 0;
133}
134EXPORT_SYMBOL(iwl_scan_cancel);
135/**
136 * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
137 * @ms: amount of time to wait (in milliseconds) for scan to abort
138 *
139 * NOTE: priv->mutex must be held before calling this function
140 */
141int iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
142{
143 unsigned long now = jiffies;
144 int ret;
145
146 ret = iwl_scan_cancel(priv);
147 if (ret && ms) {
148 mutex_unlock(&priv->mutex);
149 while (!time_after(jiffies, now + msecs_to_jiffies(ms)) &&
150 test_bit(STATUS_SCANNING, &priv->status))
151 msleep(1);
152 mutex_lock(&priv->mutex);
153
154 return test_bit(STATUS_SCANNING, &priv->status);
155 }
156
157 return ret;
158}
159EXPORT_SYMBOL(iwl_scan_cancel_timeout);
160
161static int iwl_send_scan_abort(struct iwl_priv *priv)
162{
163 int ret = 0;
164 struct iwl_rx_packet *res;
165 struct iwl_host_cmd cmd = {
166 .id = REPLY_SCAN_ABORT_CMD,
167 .meta.flags = CMD_WANT_SKB,
168 };
169
170 /* If there isn't a scan actively going on in the hardware
171 * then we are in between scan bands and not actually
172 * actively scanning, so don't send the abort command */
173 if (!test_bit(STATUS_SCAN_HW, &priv->status)) {
174 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
175 return 0;
176 }
177
178 ret = iwl_send_cmd_sync(priv, &cmd);
179 if (ret) {
180 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
181 return ret;
182 }
183
184 res = (struct iwl_rx_packet *)cmd.meta.u.skb->data;
185 if (res->u.status != CAN_ABORT_STATUS) {
186 /* The scan abort will return 1 for success or
187 * 2 for "failure". A failure condition can be
188 * due to simply not being in an active scan which
189 * can occur if we send the scan abort before we
190 * the microcode has notified us that a scan is
191 * completed. */
192 IWL_DEBUG_INFO("SCAN_ABORT returned %d.\n", res->u.status);
193 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
194 clear_bit(STATUS_SCAN_HW, &priv->status);
195 }
196
197 dev_kfree_skb_any(cmd.meta.u.skb);
198
199 return ret;
200}
201
202
203/* Service response to REPLY_SCAN_CMD (0x80) */
204static void iwl_rx_reply_scan(struct iwl_priv *priv,
205 struct iwl_rx_mem_buffer *rxb)
206{
207#ifdef CONFIG_IWLWIFI_DEBUG
208 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
209 struct iwl_scanreq_notification *notif =
210 (struct iwl_scanreq_notification *)pkt->u.raw;
211
212 IWL_DEBUG_RX("Scan request status = 0x%x\n", notif->status);
213#endif
214}
215
216/* Service SCAN_START_NOTIFICATION (0x82) */
217static void iwl_rx_scan_start_notif(struct iwl_priv *priv,
218 struct iwl_rx_mem_buffer *rxb)
219{
220 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
221 struct iwl_scanstart_notification *notif =
222 (struct iwl_scanstart_notification *)pkt->u.raw;
223 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
224 IWL_DEBUG_SCAN("Scan start: "
225 "%d [802.11%s] "
226 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
227 notif->channel,
228 notif->band ? "bg" : "a",
229 notif->tsf_high,
230 notif->tsf_low, notif->status, notif->beacon_timer);
231}
232
233/* Service SCAN_RESULTS_NOTIFICATION (0x83) */
234static void iwl_rx_scan_results_notif(struct iwl_priv *priv,
235 struct iwl_rx_mem_buffer *rxb)
236{
237#ifdef CONFIG_IWLWIFI_DEBUG
238 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
239 struct iwl_scanresults_notification *notif =
240 (struct iwl_scanresults_notification *)pkt->u.raw;
241
242 IWL_DEBUG_SCAN("Scan ch.res: "
243 "%d [802.11%s] "
244 "(TSF: 0x%08X:%08X) - %d "
245 "elapsed=%lu usec (%dms since last)\n",
246 notif->channel,
247 notif->band ? "bg" : "a",
248 le32_to_cpu(notif->tsf_high),
249 le32_to_cpu(notif->tsf_low),
250 le32_to_cpu(notif->statistics[0]),
251 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf,
252 jiffies_to_msecs(elapsed_jiffies
253 (priv->last_scan_jiffies, jiffies)));
254#endif
255
256 priv->last_scan_jiffies = jiffies;
257 priv->next_scan_jiffies = 0;
258}
259
260/* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
261static void iwl_rx_scan_complete_notif(struct iwl_priv *priv,
262 struct iwl_rx_mem_buffer *rxb)
263{
264 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
265 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
266
267 IWL_DEBUG_SCAN("Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
268 scan_notif->scanned_channels,
269 scan_notif->tsf_low,
270 scan_notif->tsf_high, scan_notif->status);
271
272 /* The HW is no longer scanning */
273 clear_bit(STATUS_SCAN_HW, &priv->status);
274
275 /* The scan completion notification came in, so kill that timer... */
276 cancel_delayed_work(&priv->scan_check);
277
278 IWL_DEBUG_INFO("Scan pass on %sGHz took %dms\n",
279 (priv->scan_bands == 2) ? "2.4" : "5.2",
280 jiffies_to_msecs(elapsed_jiffies
281 (priv->scan_pass_start, jiffies)));
282
283 /* Remove this scanned band from the list
284 * of pending bands to scan */
285 priv->scan_bands--;
286
287 /* If a request to abort was given, or the scan did not succeed
288 * then we reset the scan state machine and terminate,
289 * re-queuing another scan if one has been requested */
290 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
291 IWL_DEBUG_INFO("Aborted scan completed.\n");
292 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
293 } else {
294 /* If there are more bands on this scan pass reschedule */
295 if (priv->scan_bands > 0)
296 goto reschedule;
297 }
298
299 priv->last_scan_jiffies = jiffies;
300 priv->next_scan_jiffies = 0;
301 IWL_DEBUG_INFO("Setting scan to off\n");
302
303 clear_bit(STATUS_SCANNING, &priv->status);
304
305 IWL_DEBUG_INFO("Scan took %dms\n",
306 jiffies_to_msecs(elapsed_jiffies(priv->scan_start, jiffies)));
307
308 queue_work(priv->workqueue, &priv->scan_completed);
309
310 return;
311
312reschedule:
313 priv->scan_pass_start = jiffies;
314 queue_work(priv->workqueue, &priv->request_scan);
315}
316
317void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
318{
319 /* scan handlers */
320 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
321 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
322 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
323 iwl_rx_scan_results_notif;
324 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
325 iwl_rx_scan_complete_notif;
326}
327EXPORT_SYMBOL(iwl_setup_rx_scan_handlers);
328
329static inline u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
330 enum ieee80211_band band)
331{
332 if (band == IEEE80211_BAND_5GHZ)
333 return IWL_ACTIVE_DWELL_TIME_52;
334 else
335 return IWL_ACTIVE_DWELL_TIME_24;
336}
337
338static u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
339 enum ieee80211_band band)
340{
341 u16 active = iwl_get_active_dwell_time(priv, band);
342 u16 passive = (band != IEEE80211_BAND_5GHZ) ?
343 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
344 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
345
346 if (iwl_is_associated(priv)) {
347 /* If we're associated, we clamp the maximum passive
348 * dwell time to be 98% of the beacon interval (minus
349 * 2 * channel tune time) */
350 passive = priv->beacon_int;
351 if ((passive > IWL_PASSIVE_DWELL_BASE) || !passive)
352 passive = IWL_PASSIVE_DWELL_BASE;
353 passive = (passive * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
354 }
355
356 if (passive <= active)
357 passive = active + 1;
358
359 return passive;
360}
361
362static int iwl_get_channels_for_scan(struct iwl_priv *priv,
363 enum ieee80211_band band,
364 u8 is_active, u8 direct_mask,
365 struct iwl_scan_channel *scan_ch)
366{
367 const struct ieee80211_channel *channels = NULL;
368 const struct ieee80211_supported_band *sband;
369 const struct iwl_channel_info *ch_info;
370 u16 passive_dwell = 0;
371 u16 active_dwell = 0;
372 int added, i;
373
374 sband = iwl_get_hw_mode(priv, band);
375 if (!sband)
376 return 0;
377
378 channels = sband->channels;
379
380 active_dwell = iwl_get_active_dwell_time(priv, band);
381 passive_dwell = iwl_get_passive_dwell_time(priv, band);
382
383 for (i = 0, added = 0; i < sband->n_channels; i++) {
384 if (channels[i].flags & IEEE80211_CHAN_DISABLED)
385 continue;
386
387 scan_ch->channel =
388 ieee80211_frequency_to_channel(channels[i].center_freq);
389
390 ch_info = iwl_get_channel_info(priv, band, scan_ch->channel);
391 if (!is_channel_valid(ch_info)) {
392 IWL_DEBUG_SCAN("Channel %d is INVALID for this SKU.\n",
393 scan_ch->channel);
394 continue;
395 }
396
397 if (!is_active || is_channel_passive(ch_info) ||
398 (channels[i].flags & IEEE80211_CHAN_PASSIVE_SCAN))
399 scan_ch->type = 0;
400 else
401 scan_ch->type = 1;
402
403 if (scan_ch->type & 1)
404 scan_ch->type |= (direct_mask << 1);
405
406 scan_ch->active_dwell = cpu_to_le16(active_dwell);
407 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
408
409 /* Set txpower levels to defaults */
410 scan_ch->dsp_atten = 110;
411
412 if (band == IEEE80211_BAND_5GHZ)
413 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
414 else {
415 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
416 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
417 * power level:
418 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
419 */
420 }
421
422 IWL_DEBUG_SCAN("Scanning %d [%s %d]\n",
423 scan_ch->channel,
424 (scan_ch->type & 1) ? "ACTIVE" : "PASSIVE",
425 (scan_ch->type & 1) ?
426 active_dwell : passive_dwell);
427
428 scan_ch++;
429 added++;
430 }
431
432 IWL_DEBUG_SCAN("total channels to scan %d \n", added);
433 return added;
434}
435
436void iwl_init_scan_params(struct iwl_priv *priv)
437{
438 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
439 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = RATE_MCS_ANT_INIT_IND;
440 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
441 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = RATE_MCS_ANT_INIT_IND;
442}
443
444int iwl_scan_initiate(struct iwl_priv *priv)
445{
446 if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
447 IWL_ERROR("APs don't scan.\n");
448 return 0;
449 }
450
451 if (!iwl_is_ready_rf(priv)) {
452 IWL_DEBUG_SCAN("Aborting scan due to not ready.\n");
453 return -EIO;
454 }
455
456 if (test_bit(STATUS_SCANNING, &priv->status)) {
457 IWL_DEBUG_SCAN("Scan already in progress.\n");
458 return -EAGAIN;
459 }
460
461 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
462 IWL_DEBUG_SCAN("Scan request while abort pending. "
463 "Queuing.\n");
464 return -EAGAIN;
465 }
466
467 IWL_DEBUG_INFO("Starting scan...\n");
468 priv->scan_bands = 2;
469 set_bit(STATUS_SCANNING, &priv->status);
470 priv->scan_start = jiffies;
471 priv->scan_pass_start = priv->scan_start;
472
473 queue_work(priv->workqueue, &priv->request_scan);
474
475 return 0;
476}
477EXPORT_SYMBOL(iwl_scan_initiate);
478
479#define IWL_SCAN_CHECK_WATCHDOG (7 * HZ)
480
481static void iwl_bg_scan_check(struct work_struct *data)
482{
483 struct iwl_priv *priv =
484 container_of(data, struct iwl_priv, scan_check.work);
485
486 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
487 return;
488
489 mutex_lock(&priv->mutex);
490 if (test_bit(STATUS_SCANNING, &priv->status) ||
491 test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
492 IWL_DEBUG(IWL_DL_SCAN, "Scan completion watchdog resetting "
493 "adapter (%dms)\n",
494 jiffies_to_msecs(IWL_SCAN_CHECK_WATCHDOG));
495
496 if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
497 iwl_send_scan_abort(priv);
498 }
499 mutex_unlock(&priv->mutex);
500}
501/**
502 * iwl_supported_rate_to_ie - fill in the supported rate in IE field
503 *
504 * return : set the bit for each supported rate insert in ie
505 */
506static u16 iwl_supported_rate_to_ie(u8 *ie, u16 supported_rate,
507 u16 basic_rate, int *left)
508{
509 u16 ret_rates = 0, bit;
510 int i;
511 u8 *cnt = ie;
512 u8 *rates = ie + 1;
513
514 for (bit = 1, i = 0; i < IWL_RATE_COUNT; i++, bit <<= 1) {
515 if (bit & supported_rate) {
516 ret_rates |= bit;
517 rates[*cnt] = iwl_rates[i].ieee |
518 ((bit & basic_rate) ? 0x80 : 0x00);
519 (*cnt)++;
520 (*left)--;
521 if ((*left <= 0) ||
522 (*cnt >= IWL_SUPPORTED_RATES_IE_LEN))
523 break;
524 }
525 }
526
527 return ret_rates;
528}
529
530
531static void iwl_ht_cap_to_ie(const struct ieee80211_supported_band *sband,
532 u8 *pos, int *left)
533{
534 struct ieee80211_ht_cap *ht_cap;
535
536 if (!sband || !sband->ht_info.ht_supported)
537 return;
538
539 if (*left < sizeof(struct ieee80211_ht_cap))
540 return;
541
542 *pos++ = sizeof(struct ieee80211_ht_cap);
543 ht_cap = (struct ieee80211_ht_cap *) pos;
544
545 ht_cap->cap_info = cpu_to_le16(sband->ht_info.cap);
546 memcpy(ht_cap->supp_mcs_set, sband->ht_info.supp_mcs_set, 16);
547 ht_cap->ampdu_params_info =
548 (sband->ht_info.ampdu_factor & IEEE80211_HT_CAP_AMPDU_FACTOR) |
549 ((sband->ht_info.ampdu_density << 2) &
550 IEEE80211_HT_CAP_AMPDU_DENSITY);
551 *left -= sizeof(struct ieee80211_ht_cap);
552}
553
554/**
555 * iwl_fill_probe_req - fill in all required fields and IE for probe request
556 */
557
558static u16 iwl_fill_probe_req(struct iwl_priv *priv,
559 enum ieee80211_band band,
560 struct ieee80211_mgmt *frame,
561 int left)
562{
563 int len = 0;
564 u8 *pos = NULL;
565 u16 active_rates, ret_rates, cck_rates, active_rate_basic;
566 const struct ieee80211_supported_band *sband =
567 iwl_get_hw_mode(priv, band);
568
569
570 /* Make sure there is enough space for the probe request,
571 * two mandatory IEs and the data */
572 left -= 24;
573 if (left < 0)
574 return 0;
575
576 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
577 memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
578 memcpy(frame->sa, priv->mac_addr, ETH_ALEN);
579 memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
580 frame->seq_ctrl = 0;
581
582 len += 24;
583
584 /* ...next IE... */
585 pos = &frame->u.probe_req.variable[0];
586
587 /* fill in our indirect SSID IE */
588 left -= 2;
589 if (left < 0)
590 return 0;
591 *pos++ = WLAN_EID_SSID;
592 *pos++ = 0;
593
594 len += 2;
595
596 /* fill in supported rate */
597 left -= 2;
598 if (left < 0)
599 return 0;
600
601 *pos++ = WLAN_EID_SUPP_RATES;
602 *pos = 0;
603
604 /* exclude 60M rate */
605 active_rates = priv->rates_mask;
606 active_rates &= ~IWL_RATE_60M_MASK;
607
608 active_rate_basic = active_rates & IWL_BASIC_RATES_MASK;
609
610 cck_rates = IWL_CCK_RATES_MASK & active_rates;
611 ret_rates = iwl_supported_rate_to_ie(pos, cck_rates,
612 active_rate_basic, &left);
613 active_rates &= ~ret_rates;
614
615 ret_rates = iwl_supported_rate_to_ie(pos, active_rates,
616 active_rate_basic, &left);
617 active_rates &= ~ret_rates;
618
619 len += 2 + *pos;
620 pos += (*pos) + 1;
621
622 if (active_rates == 0)
623 goto fill_end;
624
625 /* fill in supported extended rate */
626 /* ...next IE... */
627 left -= 2;
628 if (left < 0)
629 return 0;
630 /* ... fill it in... */
631 *pos++ = WLAN_EID_EXT_SUPP_RATES;
632 *pos = 0;
633 iwl_supported_rate_to_ie(pos, active_rates, active_rate_basic, &left);
634 if (*pos > 0) {
635 len += 2 + *pos;
636 pos += (*pos) + 1;
637 } else {
638 pos--;
639 }
640
641 fill_end:
642
643 left -= 2;
644 if (left < 0)
645 return 0;
646
647 *pos++ = WLAN_EID_HT_CAPABILITY;
648 *pos = 0;
649 iwl_ht_cap_to_ie(sband, pos, &left);
650 if (*pos > 0)
651 len += 2 + *pos;
652
653 return (u16)len;
654}
655
656static u32 iwl_scan_tx_ant(struct iwl_priv *priv, enum ieee80211_band band)
657{
658 int i, ind;
659
660 ind = priv->scan_tx_ant[band];
661 for (i = 0; i < priv->hw_params.tx_chains_num; i++) {
662 ind = (ind+1) >= priv->hw_params.tx_chains_num ? 0 : ind+1;
663 if (priv->hw_params.valid_tx_ant & (1 << ind)) {
664 priv->scan_tx_ant[band] = ind;
665 break;
666 }
667 }
668
669 return scan_tx_ant[ind];
670}
671
672
673static void iwl_bg_request_scan(struct work_struct *data)
674{
675 struct iwl_priv *priv =
676 container_of(data, struct iwl_priv, request_scan);
677 struct iwl_host_cmd cmd = {
678 .id = REPLY_SCAN_CMD,
679 .len = sizeof(struct iwl_scan_cmd),
680 .meta.flags = CMD_SIZE_HUGE,
681 };
682 struct iwl_scan_cmd *scan;
683 struct ieee80211_conf *conf = NULL;
684 int ret = 0;
685 u32 tx_ant;
686 u16 cmd_len;
687 enum ieee80211_band band;
688 u8 direct_mask;
689 u8 rx_chain = 0x7; /* bitmap: ABC chains */
690
691 conf = ieee80211_get_hw_conf(priv->hw);
692
693 mutex_lock(&priv->mutex);
694
695 if (!iwl_is_ready(priv)) {
696 IWL_WARNING("request scan called when driver not ready.\n");
697 goto done;
698 }
699
700 /* Make sure the scan wasn't cancelled before this queued work
701 * was given the chance to run... */
702 if (!test_bit(STATUS_SCANNING, &priv->status))
703 goto done;
704
705 /* This should never be called or scheduled if there is currently
706 * a scan active in the hardware. */
707 if (test_bit(STATUS_SCAN_HW, &priv->status)) {
708 IWL_DEBUG_INFO("Multiple concurrent scan requests in parallel. "
709 "Ignoring second request.\n");
710 ret = -EIO;
711 goto done;
712 }
713
714 if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
715 IWL_DEBUG_SCAN("Aborting scan due to device shutdown\n");
716 goto done;
717 }
718
719 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
720 IWL_DEBUG_HC("Scan request while abort pending. Queuing.\n");
721 goto done;
722 }
723
724 if (iwl_is_rfkill(priv)) {
725 IWL_DEBUG_HC("Aborting scan due to RF Kill activation\n");
726 goto done;
727 }
728
729 if (!test_bit(STATUS_READY, &priv->status)) {
730 IWL_DEBUG_HC("Scan request while uninitialized. Queuing.\n");
731 goto done;
732 }
733
734 if (!priv->scan_bands) {
735 IWL_DEBUG_HC("Aborting scan due to no requested bands\n");
736 goto done;
737 }
738
739 if (!priv->scan) {
740 priv->scan = kmalloc(sizeof(struct iwl_scan_cmd) +
741 IWL_MAX_SCAN_SIZE, GFP_KERNEL);
742 if (!priv->scan) {
743 ret = -ENOMEM;
744 goto done;
745 }
746 }
747 scan = priv->scan;
748 memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE);
749
750 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
751 scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
752
753 if (iwl_is_associated(priv)) {
754 u16 interval = 0;
755 u32 extra;
756 u32 suspend_time = 100;
757 u32 scan_suspend_time = 100;
758 unsigned long flags;
759
760 IWL_DEBUG_INFO("Scanning while associated...\n");
761
762 spin_lock_irqsave(&priv->lock, flags);
763 interval = priv->beacon_int;
764 spin_unlock_irqrestore(&priv->lock, flags);
765
766 scan->suspend_time = 0;
767 scan->max_out_time = cpu_to_le32(200 * 1024);
768 if (!interval)
769 interval = suspend_time;
770
771 extra = (suspend_time / interval) << 22;
772 scan_suspend_time = (extra |
773 ((suspend_time % interval) * 1024));
774 scan->suspend_time = cpu_to_le32(scan_suspend_time);
775 IWL_DEBUG_SCAN("suspend_time 0x%X beacon interval %d\n",
776 scan_suspend_time, interval);
777 }
778
779 /* We should add the ability for user to lock to PASSIVE ONLY */
780 if (priv->one_direct_scan) {
781 IWL_DEBUG_SCAN("Start direct scan for '%s'\n",
782 iwl_escape_essid(priv->direct_ssid,
783 priv->direct_ssid_len));
784 scan->direct_scan[0].id = WLAN_EID_SSID;
785 scan->direct_scan[0].len = priv->direct_ssid_len;
786 memcpy(scan->direct_scan[0].ssid,
787 priv->direct_ssid, priv->direct_ssid_len);
788 direct_mask = 1;
789 } else if (!iwl_is_associated(priv) && priv->essid_len) {
790 IWL_DEBUG_SCAN("Start direct scan for '%s' (not associated)\n",
791 iwl_escape_essid(priv->essid, priv->essid_len));
792 scan->direct_scan[0].id = WLAN_EID_SSID;
793 scan->direct_scan[0].len = priv->essid_len;
794 memcpy(scan->direct_scan[0].ssid, priv->essid, priv->essid_len);
795 direct_mask = 1;
796 } else {
797 IWL_DEBUG_SCAN("Start indirect scan.\n");
798 direct_mask = 0;
799 }
800
801 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
802 scan->tx_cmd.sta_id = priv->hw_params.bcast_sta_id;
803 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
804
805
806 switch (priv->scan_bands) {
807 case 2:
808 band = IEEE80211_BAND_2GHZ;
809 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
810 tx_ant = iwl_scan_tx_ant(priv, band);
811 if (priv->active_rxon.flags & RXON_FLG_CHANNEL_MODE_PURE_40_MSK)
812 scan->tx_cmd.rate_n_flags =
813 iwl_hw_set_rate_n_flags(IWL_RATE_6M_PLCP,
814 tx_ant);
815 else
816 scan->tx_cmd.rate_n_flags =
817 iwl_hw_set_rate_n_flags(IWL_RATE_1M_PLCP,
818 tx_ant |
819 RATE_MCS_CCK_MSK);
820 scan->good_CRC_th = 0;
821 break;
822
823 case 1:
824 band = IEEE80211_BAND_5GHZ;
825 tx_ant = iwl_scan_tx_ant(priv, band);
826 scan->tx_cmd.rate_n_flags =
827 iwl_hw_set_rate_n_flags(IWL_RATE_6M_PLCP,
828 tx_ant);
829 scan->good_CRC_th = IWL_GOOD_CRC_TH;
830
831 /* Force use of chains B and C (0x6) for scan Rx for 4965
832 * Avoid A (0x1) because of its off-channel reception on A-band.
833 * MIMO is not used here, but value is required */
834 if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965)
835 rx_chain = 0x6;
836
837 break;
838 default:
839 IWL_WARNING("Invalid scan band count\n");
840 goto done;
841 }
842
843 scan->rx_chain = RXON_RX_CHAIN_DRIVER_FORCE_MSK |
844 cpu_to_le16((0x7 << RXON_RX_CHAIN_VALID_POS) |
845 (rx_chain << RXON_RX_CHAIN_FORCE_SEL_POS) |
846 (0x7 << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS));
847
848 cmd_len = iwl_fill_probe_req(priv, band,
849 (struct ieee80211_mgmt *)scan->data,
850 IWL_MAX_SCAN_SIZE - sizeof(*scan));
851
852 scan->tx_cmd.len = cpu_to_le16(cmd_len);
853
854 if (priv->iw_mode == IEEE80211_IF_TYPE_MNTR)
855 scan->filter_flags = RXON_FILTER_PROMISC_MSK;
856
857 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
858 RXON_FILTER_BCON_AWARE_MSK);
859
860 if (direct_mask)
861 scan->channel_count =
862 iwl_get_channels_for_scan(priv, band, 1, /* active */
863 direct_mask,
864 (void *)&scan->data[le16_to_cpu(scan->tx_cmd.len)]);
865 else
866 scan->channel_count =
867 iwl_get_channels_for_scan(priv, band, 0, /* passive */
868 direct_mask,
869 (void *)&scan->data[le16_to_cpu(scan->tx_cmd.len)]);
870 if (scan->channel_count == 0) {
871 IWL_DEBUG_SCAN("channel count %d\n", scan->channel_count);
872 goto done;
873 }
874
875 cmd.len += le16_to_cpu(scan->tx_cmd.len) +
876 scan->channel_count * sizeof(struct iwl_scan_channel);
877 cmd.data = scan;
878 scan->len = cpu_to_le16(cmd.len);
879
880 set_bit(STATUS_SCAN_HW, &priv->status);
881 ret = iwl_send_cmd_sync(priv, &cmd);
882 if (ret)
883 goto done;
884
885 queue_delayed_work(priv->workqueue, &priv->scan_check,
886 IWL_SCAN_CHECK_WATCHDOG);
887
888 mutex_unlock(&priv->mutex);
889 return;
890
891 done:
892 /* inform mac80211 scan aborted */
893 queue_work(priv->workqueue, &priv->scan_completed);
894 mutex_unlock(&priv->mutex);
895}
896
897static void iwl_bg_abort_scan(struct work_struct *work)
898{
899 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
900
901 if (!iwl_is_ready(priv))
902 return;
903
904 mutex_lock(&priv->mutex);
905
906 set_bit(STATUS_SCAN_ABORTING, &priv->status);
907 iwl_send_scan_abort(priv);
908
909 mutex_unlock(&priv->mutex);
910}
911
912void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
913{
914 /* FIXME: move here when resolved PENDING
915 * INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed); */
916 INIT_WORK(&priv->request_scan, iwl_bg_request_scan);
917 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
918 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
919}
920EXPORT_SYMBOL(iwl_setup_scan_deferred_work);
921
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-04 06:41:26 -0500