projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
iwlwifi: unify 4965 and 5000 scanning code
[deliverable/linux.git] / drivers / net / wireless / iwlwifi / iwl-scan.c
CommitLineData
2a421b91
TW		 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
f53696de
TW		 61static int scan_tx_ant[3] = {
62 RATE_MCS_ANT_A_MSK, RATE_MCS_ANT_B_MSK, RATE_MCS_ANT_C_MSK
63};
2a421b91
TW		 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",
1b63ba8a
DM		 279 (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) ?
280 "2.4" : "5.2",
2a421b91
TW		 281 jiffies_to_msecs(elapsed_jiffies
282 (priv->scan_pass_start, jiffies)));
283
1b63ba8a
DM		 284 /* Remove this scanned band from the list of pending
285 * bands to scan, band G precedes A in order of scanning
286 * as seen in iwl_bg_request_scan */
287 if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ))
288 priv->scan_bands &= ~BIT(IEEE80211_BAND_2GHZ);
289 else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ))
290 priv->scan_bands &= ~BIT(IEEE80211_BAND_5GHZ);
2a421b91
TW		 291
292 /* If a request to abort was given, or the scan did not succeed
293 * then we reset the scan state machine and terminate,
294 * re-queuing another scan if one has been requested */
295 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
296 IWL_DEBUG_INFO("Aborted scan completed.\n");
297 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
298 } else {
299 /* If there are more bands on this scan pass reschedule */
1b63ba8a 300 if (priv->scan_bands)
2a421b91
TW		 301 goto reschedule;
302 }
303
304 priv->last_scan_jiffies = jiffies;
305 priv->next_scan_jiffies = 0;
306 IWL_DEBUG_INFO("Setting scan to off\n");
307
308 clear_bit(STATUS_SCANNING, &priv->status);
309
310 IWL_DEBUG_INFO("Scan took %dms\n",
311 jiffies_to_msecs(elapsed_jiffies(priv->scan_start, jiffies)));
312
313 queue_work(priv->workqueue, &priv->scan_completed);
314
315 return;
316
317reschedule:
318 priv->scan_pass_start = jiffies;
319 queue_work(priv->workqueue, &priv->request_scan);
320}
321
322void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
323{
324 /* scan handlers */
325 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
326 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
327 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
328 iwl_rx_scan_results_notif;
329 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
330 iwl_rx_scan_complete_notif;
331}
332EXPORT_SYMBOL(iwl_setup_rx_scan_handlers);
333
334static inline u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
335 enum ieee80211_band band)
336{
337 if (band == IEEE80211_BAND_5GHZ)
338 return IWL_ACTIVE_DWELL_TIME_52;
339 else
340 return IWL_ACTIVE_DWELL_TIME_24;
341}
342
343static u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
344 enum ieee80211_band band)
345{
346 u16 active = iwl_get_active_dwell_time(priv, band);
347 u16 passive = (band != IEEE80211_BAND_5GHZ) ?
348 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
349 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
350
351 if (iwl_is_associated(priv)) {
352 /* If we're associated, we clamp the maximum passive
353 * dwell time to be 98% of the beacon interval (minus
354 * 2 * channel tune time) */
355 passive = priv->beacon_int;
356 if ((passive > IWL_PASSIVE_DWELL_BASE) || !passive)
357 passive = IWL_PASSIVE_DWELL_BASE;
358 passive = (passive * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
359 }
360
361 if (passive <= active)
362 passive = active + 1;
363
364 return passive;
365}
366
367static int iwl_get_channels_for_scan(struct iwl_priv *priv,
368 enum ieee80211_band band,
369 u8 is_active, u8 direct_mask,
370 struct iwl_scan_channel *scan_ch)
371{
372 const struct ieee80211_channel *channels = NULL;
373 const struct ieee80211_supported_band *sband;
374 const struct iwl_channel_info *ch_info;
375 u16 passive_dwell = 0;
376 u16 active_dwell = 0;
377 int added, i;
d16dc48a 378 u16 channel;
2a421b91
TW		 379
380 sband = iwl_get_hw_mode(priv, band);
381 if (!sband)
382 return 0;
383
384 channels = sband->channels;
385
386 active_dwell = iwl_get_active_dwell_time(priv, band);
387 passive_dwell = iwl_get_passive_dwell_time(priv, band);
388
389 for (i = 0, added = 0; i < sband->n_channels; i++) {
390 if (channels[i].flags & IEEE80211_CHAN_DISABLED)
391 continue;
392
d16dc48a 393 channel =
2a421b91 394 ieee80211_frequency_to_channel(channels[i].center_freq);
d16dc48a 395 scan_ch->channel = cpu_to_le16(channel);
2a421b91 396
d16dc48a 397 ch_info = iwl_get_channel_info(priv, band, channel);
2a421b91 398 if (!is_channel_valid(ch_info)) {
1b63ba8a 399 IWL_DEBUG_SCAN("Channel %d is INVALID for this band.\n",
d16dc48a 400 channel);
2a421b91
TW		 401 continue;
402 }
403
404 if (!is_active || is_channel_passive(ch_info) ||
405 (channels[i].flags & IEEE80211_CHAN_PASSIVE_SCAN))
d16dc48a 406 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
2a421b91 407 else
d16dc48a 408 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
2a421b91 409
d16dc48a
TW		 410 if (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE)
411 scan_ch->type |= cpu_to_le32(direct_mask << 1);
2a421b91
TW		 412
413 scan_ch->active_dwell = cpu_to_le16(active_dwell);
414 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
415
416 /* Set txpower levels to defaults */
f53696de 417 scan_ch->dsp_atten = 110;
2a421b91 418
2a421b91 419 if (band == IEEE80211_BAND_5GHZ)
f53696de 420 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
2a421b91 421 else {
f53696de 422 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
2a421b91
TW		 423 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
424 * power level:
f53696de 425 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
2a421b91
TW		 426 */
427 }
428
429 IWL_DEBUG_SCAN("Scanning %d [%s %d]\n",
d16dc48a
TW		 430 channel,
431 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
432 "ACTIVE" : "PASSIVE",
433 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
2a421b91
TW		 434 active_dwell : passive_dwell);
435
436 scan_ch++;
437 added++;
438 }
439
440 IWL_DEBUG_SCAN("total channels to scan %d \n", added);
441 return added;
442}
443
f53696de
TW		 444void iwl_init_scan_params(struct iwl_priv *priv)
445{
446 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
447 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = RATE_MCS_ANT_INIT_IND;
448 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
449 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = RATE_MCS_ANT_INIT_IND;
450}
451
2a421b91
TW		 452int iwl_scan_initiate(struct iwl_priv *priv)
453{
454 if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
455 IWL_ERROR("APs don't scan.\n");
456 return 0;
457 }
458
459 if (!iwl_is_ready_rf(priv)) {
460 IWL_DEBUG_SCAN("Aborting scan due to not ready.\n");
461 return -EIO;
462 }
463
464 if (test_bit(STATUS_SCANNING, &priv->status)) {
465 IWL_DEBUG_SCAN("Scan already in progress.\n");
466 return -EAGAIN;
467 }
468
469 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
470 IWL_DEBUG_SCAN("Scan request while abort pending. "
471 "Queuing.\n");
472 return -EAGAIN;
473 }
474
475 IWL_DEBUG_INFO("Starting scan...\n");
1b63ba8a
DM		 476 if (priv->cfg->sku & IWL_SKU_G)
477 priv->scan_bands |= BIT(IEEE80211_BAND_2GHZ);
478 if (priv->cfg->sku & IWL_SKU_A)
479 priv->scan_bands |= BIT(IEEE80211_BAND_5GHZ);
2a421b91
TW		 480 set_bit(STATUS_SCANNING, &priv->status);
481 priv->scan_start = jiffies;
482 priv->scan_pass_start = priv->scan_start;
483
484 queue_work(priv->workqueue, &priv->request_scan);
485
486 return 0;
487}
488EXPORT_SYMBOL(iwl_scan_initiate);
489
490#define IWL_SCAN_CHECK_WATCHDOG (7 * HZ)
491
492static void iwl_bg_scan_check(struct work_struct *data)
493{
494 struct iwl_priv *priv =
495 container_of(data, struct iwl_priv, scan_check.work);
496
497 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
498 return;
499
500 mutex_lock(&priv->mutex);
501 if (test_bit(STATUS_SCANNING, &priv->status) ||
502 test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
503 IWL_DEBUG(IWL_DL_SCAN, "Scan completion watchdog resetting "
504 "adapter (%dms)\n",
505 jiffies_to_msecs(IWL_SCAN_CHECK_WATCHDOG));
506
507 if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
508 iwl_send_scan_abort(priv);
509 }
510 mutex_unlock(&priv->mutex);
511}
512/**
513 * iwl_supported_rate_to_ie - fill in the supported rate in IE field
514 *
515 * return : set the bit for each supported rate insert in ie
516 */
517static u16 iwl_supported_rate_to_ie(u8 *ie, u16 supported_rate,
518 u16 basic_rate, int *left)
519{
520 u16 ret_rates = 0, bit;
521 int i;
522 u8 *cnt = ie;
523 u8 *rates = ie + 1;
524
525 for (bit = 1, i = 0; i < IWL_RATE_COUNT; i++, bit <<= 1) {
526 if (bit & supported_rate) {
527 ret_rates |= bit;
528 rates[*cnt] = iwl_rates[i].ieee |
529 ((bit & basic_rate) ? 0x80 : 0x00);
530 (*cnt)++;
531 (*left)--;
532 if ((*left <= 0) ||
533 (*cnt >= IWL_SUPPORTED_RATES_IE_LEN))
534 break;
535 }
536 }
537
538 return ret_rates;
539}
540
541
542static void iwl_ht_cap_to_ie(const struct ieee80211_supported_band *sband,
f53696de 543 u8 *pos, int *left)
2a421b91
TW		 544{
545 struct ieee80211_ht_cap *ht_cap;
546
547 if (!sband || !sband->ht_info.ht_supported)
548 return;
549
550 if (*left < sizeof(struct ieee80211_ht_cap))
551 return;
552
553 *pos++ = sizeof(struct ieee80211_ht_cap);
554 ht_cap = (struct ieee80211_ht_cap *) pos;
555
556 ht_cap->cap_info = cpu_to_le16(sband->ht_info.cap);
557 memcpy(ht_cap->supp_mcs_set, sband->ht_info.supp_mcs_set, 16);
558 ht_cap->ampdu_params_info =
559 (sband->ht_info.ampdu_factor & IEEE80211_HT_CAP_AMPDU_FACTOR) |
560 ((sband->ht_info.ampdu_density << 2) &
561 IEEE80211_HT_CAP_AMPDU_DENSITY);
562 *left -= sizeof(struct ieee80211_ht_cap);
563}
564
565/**
566 * iwl_fill_probe_req - fill in all required fields and IE for probe request
567 */
f53696de 568
2a421b91
TW		 569static u16 iwl_fill_probe_req(struct iwl_priv *priv,
570 enum ieee80211_band band,
571 struct ieee80211_mgmt *frame,
f53696de 572 int left)
2a421b91
TW		 573{
574 int len = 0;
575 u8 *pos = NULL;
576 u16 active_rates, ret_rates, cck_rates, active_rate_basic;
577 const struct ieee80211_supported_band *sband =
578 iwl_get_hw_mode(priv, band);
579
f53696de 580
2a421b91
TW		 581 /* Make sure there is enough space for the probe request,
582 * two mandatory IEs and the data */
583 left -= 24;
584 if (left < 0)
585 return 0;
2a421b91
TW		 586
587 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
588 memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
589 memcpy(frame->sa, priv->mac_addr, ETH_ALEN);
590 memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
591 frame->seq_ctrl = 0;
592
f53696de
TW		 593 len += 24;
594
2a421b91 595 /* ...next IE... */
f53696de 596 pos = &frame->u.probe_req.variable[0];
2a421b91 597
f53696de 598 /* fill in our indirect SSID IE */
2a421b91
TW		 599 left -= 2;
600 if (left < 0)
601 return 0;
2a421b91
TW		 602 *pos++ = WLAN_EID_SSID;
603 *pos++ = 0;
604
f53696de 605 len += 2;
2a421b91
TW		 606
607 /* fill in supported rate */
2a421b91
TW		 608 left -= 2;
609 if (left < 0)
610 return 0;
611
2a421b91
TW		 612 *pos++ = WLAN_EID_SUPP_RATES;
613 *pos = 0;
614
615 /* exclude 60M rate */
616 active_rates = priv->rates_mask;
617 active_rates &= ~IWL_RATE_60M_MASK;
618
619 active_rate_basic = active_rates & IWL_BASIC_RATES_MASK;
620
621 cck_rates = IWL_CCK_RATES_MASK & active_rates;
622 ret_rates = iwl_supported_rate_to_ie(pos, cck_rates,
f53696de 623 active_rate_basic, &left);
2a421b91
TW		 624 active_rates &= ~ret_rates;
625
626 ret_rates = iwl_supported_rate_to_ie(pos, active_rates,
f53696de 627 active_rate_basic, &left);
2a421b91
TW		 628 active_rates &= ~ret_rates;
629
630 len += 2 + *pos;
631 pos += (*pos) + 1;
f53696de 632
2a421b91
TW		 633 if (active_rates == 0)
634 goto fill_end;
635
636 /* fill in supported extended rate */
637 /* ...next IE... */
638 left -= 2;
639 if (left < 0)
640 return 0;
641 /* ... fill it in... */
642 *pos++ = WLAN_EID_EXT_SUPP_RATES;
643 *pos = 0;
f53696de
TW		 644 iwl_supported_rate_to_ie(pos, active_rates, active_rate_basic, &left);
645 if (*pos > 0) {
2a421b91 646 len += 2 + *pos;
f53696de
TW		 647 pos += (*pos) + 1;
648 } else {
649 pos--;
650 }
2a421b91
TW		 651
652 fill_end:
f53696de 653
2a421b91
TW		 654 left -= 2;
655 if (left < 0)
656 return 0;
657
658 *pos++ = WLAN_EID_HT_CAPABILITY;
659 *pos = 0;
2a421b91 660 iwl_ht_cap_to_ie(sband, pos, &left);
2a421b91
TW		 661 if (*pos > 0)
662 len += 2 + *pos;
f53696de 663
2a421b91
TW		 664 return (u16)len;
665}
666
f53696de
TW		 667static u32 iwl_scan_tx_ant(struct iwl_priv *priv, enum ieee80211_band band)
668{
669 int i, ind;
670
671 ind = priv->scan_tx_ant[band];
672 for (i = 0; i < priv->hw_params.tx_chains_num; i++) {
673 ind = (ind+1) >= priv->hw_params.tx_chains_num ? 0 : ind+1;
674 if (priv->hw_params.valid_tx_ant & (1 << ind)) {
675 priv->scan_tx_ant[band] = ind;
676 break;
677 }
678 }
679
680 return scan_tx_ant[ind];
681}
682
683
2a421b91
TW		 684static void iwl_bg_request_scan(struct work_struct *data)
685{
686 struct iwl_priv *priv =
687 container_of(data, struct iwl_priv, request_scan);
688 struct iwl_host_cmd cmd = {
689 .id = REPLY_SCAN_CMD,
690 .len = sizeof(struct iwl_scan_cmd),
691 .meta.flags = CMD_SIZE_HUGE,
692 };
693 struct iwl_scan_cmd *scan;
694 struct ieee80211_conf *conf = NULL;
f53696de
TW		 695 int ret = 0;
696 u32 tx_ant;
2a421b91
TW		 697 u16 cmd_len;
698 enum ieee80211_band band;
699 u8 direct_mask;
f53696de 700 u8 rx_chain = 0x7; /* bitmap: ABC chains */
2a421b91
TW		 701
702 conf = ieee80211_get_hw_conf(priv->hw);
703
704 mutex_lock(&priv->mutex);
705
706 if (!iwl_is_ready(priv)) {
707 IWL_WARNING("request scan called when driver not ready.\n");
708 goto done;
709 }
710
711 /* Make sure the scan wasn't cancelled before this queued work
712 * was given the chance to run... */
713 if (!test_bit(STATUS_SCANNING, &priv->status))
714 goto done;
715
716 /* This should never be called or scheduled if there is currently
717 * a scan active in the hardware. */
718 if (test_bit(STATUS_SCAN_HW, &priv->status)) {
719 IWL_DEBUG_INFO("Multiple concurrent scan requests in parallel. "
720 "Ignoring second request.\n");
721 ret = -EIO;
722 goto done;
723 }
724
725 if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
726 IWL_DEBUG_SCAN("Aborting scan due to device shutdown\n");
727 goto done;
728 }
729
730 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
731 IWL_DEBUG_HC("Scan request while abort pending. Queuing.\n");
732 goto done;
733 }
734
735 if (iwl_is_rfkill(priv)) {
736 IWL_DEBUG_HC("Aborting scan due to RF Kill activation\n");
737 goto done;
738 }
739
740 if (!test_bit(STATUS_READY, &priv->status)) {
741 IWL_DEBUG_HC("Scan request while uninitialized. Queuing.\n");
742 goto done;
743 }
744
745 if (!priv->scan_bands) {
746 IWL_DEBUG_HC("Aborting scan due to no requested bands\n");
747 goto done;
748 }
749
750 if (!priv->scan) {
751 priv->scan = kmalloc(sizeof(struct iwl_scan_cmd) +
752 IWL_MAX_SCAN_SIZE, GFP_KERNEL);
753 if (!priv->scan) {
754 ret = -ENOMEM;
755 goto done;
756 }
757 }
758 scan = priv->scan;
759 memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE);
760
761 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
762 scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
763
764 if (iwl_is_associated(priv)) {
765 u16 interval = 0;
766 u32 extra;
767 u32 suspend_time = 100;
768 u32 scan_suspend_time = 100;
769 unsigned long flags;
770
771 IWL_DEBUG_INFO("Scanning while associated...\n");
772
773 spin_lock_irqsave(&priv->lock, flags);
774 interval = priv->beacon_int;
775 spin_unlock_irqrestore(&priv->lock, flags);
776
777 scan->suspend_time = 0;
778 scan->max_out_time = cpu_to_le32(200 * 1024);
779 if (!interval)
780 interval = suspend_time;
781
782 extra = (suspend_time / interval) << 22;
783 scan_suspend_time = (extra |
784 ((suspend_time % interval) * 1024));
785 scan->suspend_time = cpu_to_le32(scan_suspend_time);
786 IWL_DEBUG_SCAN("suspend_time 0x%X beacon interval %d\n",
787 scan_suspend_time, interval);
788 }
789
790 /* We should add the ability for user to lock to PASSIVE ONLY */
791 if (priv->one_direct_scan) {
f53696de
TW		 792 IWL_DEBUG_SCAN("Start direct scan for '%s'\n",
793 iwl_escape_essid(priv->direct_ssid,
794 priv->direct_ssid_len));
2a421b91
TW		 795 scan->direct_scan[0].id = WLAN_EID_SSID;
796 scan->direct_scan[0].len = priv->direct_ssid_len;
797 memcpy(scan->direct_scan[0].ssid,
798 priv->direct_ssid, priv->direct_ssid_len);
799 direct_mask = 1;
800 } else if (!iwl_is_associated(priv) && priv->essid_len) {
f53696de
TW		 801 IWL_DEBUG_SCAN("Start direct scan for '%s' (not associated)\n",
802 iwl_escape_essid(priv->essid, priv->essid_len));
2a421b91
TW		 803 scan->direct_scan[0].id = WLAN_EID_SSID;
804 scan->direct_scan[0].len = priv->essid_len;
805 memcpy(scan->direct_scan[0].ssid, priv->essid, priv->essid_len);
806 direct_mask = 1;
807 } else {
f53696de 808 IWL_DEBUG_SCAN("Start indirect scan.\n");
2a421b91
TW		 809 direct_mask = 0;
810 }
811
812 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
813 scan->tx_cmd.sta_id = priv->hw_params.bcast_sta_id;
814 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
815
816
1b63ba8a 817 if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) {
f53696de 818 band = IEEE80211_BAND_2GHZ;
2a421b91 819 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
f53696de
TW		 820 tx_ant = iwl_scan_tx_ant(priv, band);
821 if (priv->active_rxon.flags & RXON_FLG_CHANNEL_MODE_PURE_40_MSK)
822 scan->tx_cmd.rate_n_flags =
823 iwl_hw_set_rate_n_flags(IWL_RATE_6M_PLCP,
824 tx_ant);
825 else
826 scan->tx_cmd.rate_n_flags =
e7d326ac 827 iwl_hw_set_rate_n_flags(IWL_RATE_1M_PLCP,
f53696de 828 tx_ant |
e7d326ac 829 RATE_MCS_CCK_MSK);
2a421b91 830 scan->good_CRC_th = 0;
1b63ba8a 831 } else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ)) {
f53696de
TW		 832 band = IEEE80211_BAND_5GHZ;
833 tx_ant = iwl_scan_tx_ant(priv, band);
2a421b91 834 scan->tx_cmd.rate_n_flags =
e7d326ac 835 iwl_hw_set_rate_n_flags(IWL_RATE_6M_PLCP,
f53696de 836 tx_ant);
2a421b91 837 scan->good_CRC_th = IWL_GOOD_CRC_TH;
2a421b91 838
f53696de
TW		 839 /* Force use of chains B and C (0x6) for scan Rx for 4965
840 * Avoid A (0x1) because of its off-channel reception on A-band.
841 * MIMO is not used here, but value is required */
842 if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965)
843 rx_chain = 0x6;
1b63ba8a 844 } else {
2a421b91
TW		 845 IWL_WARNING("Invalid scan band count\n");
846 goto done;
847 }
848
f53696de
TW		 849 scan->rx_chain = RXON_RX_CHAIN_DRIVER_FORCE_MSK |
850 cpu_to_le16((0x7 << RXON_RX_CHAIN_VALID_POS) |
851 (rx_chain << RXON_RX_CHAIN_FORCE_SEL_POS) |
852 (0x7 << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS));
853
2a421b91 854 cmd_len = iwl_fill_probe_req(priv, band,
f53696de
TW		 855 (struct ieee80211_mgmt *)scan->data,
856 IWL_MAX_SCAN_SIZE - sizeof(*scan));
2a421b91
TW		 857
858 scan->tx_cmd.len = cpu_to_le16(cmd_len);
2a421b91
TW		 859
860 if (priv->iw_mode == IEEE80211_IF_TYPE_MNTR)
861 scan->filter_flags = RXON_FILTER_PROMISC_MSK;
862
f53696de
TW		 863 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
864 RXON_FILTER_BCON_AWARE_MSK);
865
2a421b91
TW		 866 if (direct_mask)
867 scan->channel_count =
f53696de
TW		 868 iwl_get_channels_for_scan(priv, band, 1, /* active */
869 direct_mask,
2a421b91
TW		 870 (void *)&scan->data[le16_to_cpu(scan->tx_cmd.len)]);
871 else
872 scan->channel_count =
f53696de
TW		 873 iwl_get_channels_for_scan(priv, band, 0, /* passive */
874 direct_mask,
2a421b91 875 (void *)&scan->data[le16_to_cpu(scan->tx_cmd.len)]);
f53696de
TW		 876 if (scan->channel_count == 0) {
877 IWL_DEBUG_SCAN("channel count %d\n", scan->channel_count);
878 goto done;
879 }
2a421b91 880
2a421b91
TW		 881 cmd.len += le16_to_cpu(scan->tx_cmd.len) +
882 scan->channel_count * sizeof(struct iwl_scan_channel);
883 cmd.data = scan;
884 scan->len = cpu_to_le16(cmd.len);
885
886 set_bit(STATUS_SCAN_HW, &priv->status);
887 ret = iwl_send_cmd_sync(priv, &cmd);
888 if (ret)
889 goto done;
890
891 queue_delayed_work(priv->workqueue, &priv->scan_check,
892 IWL_SCAN_CHECK_WATCHDOG);
893
894 mutex_unlock(&priv->mutex);
895 return;
896
897 done:
898 /* inform mac80211 scan aborted */
899 queue_work(priv->workqueue, &priv->scan_completed);
900 mutex_unlock(&priv->mutex);
901}
902
903static void iwl_bg_abort_scan(struct work_struct *work)
904{
905 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
906
907 if (!iwl_is_ready(priv))
908 return;
909
910 mutex_lock(&priv->mutex);
911
912 set_bit(STATUS_SCAN_ABORTING, &priv->status);
913 iwl_send_scan_abort(priv);
914
915 mutex_unlock(&priv->mutex);
916}
917
918void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
919{
920 /* FIXME: move here when resolved PENDING
921 * INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed); */
922 INIT_WORK(&priv->request_scan, iwl_bg_request_scan);
923 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
924 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
925}
926EXPORT_SYMBOL(iwl_setup_scan_deferred_work);
927
Linux kernel - Deliverables
This page took 0.083536 seconds and 5 git commands to generate.