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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris...
[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. */
fe905f1d
TW		 41#define IWL_ACTIVE_DWELL_TIME_24 (30) /* all times in msec */
42#define IWL_ACTIVE_DWELL_TIME_52 (20)
43
44#define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3)
45#define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2)
2a421b91
TW		 46
47/* For faster active scanning, scan will move to the next channel if fewer than
48 * PLCP_QUIET_THRESH packets are heard on this channel within
49 * ACTIVE_QUIET_TIME after sending probe request. This shortens the dwell
50 * time if it's a quiet channel (nothing responded to our probe, and there's
51 * no other traffic).
52 * Disable "quiet" feature by setting PLCP_QUIET_THRESH to 0. */
53#define IWL_PLCP_QUIET_THRESH __constant_cpu_to_le16(1) /* packets */
fe905f1d 54#define IWL_ACTIVE_QUIET_TIME __constant_cpu_to_le16(10) /* msec */
2a421b91
TW		 55
56/* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
57 * Must be set longer than active dwell time.
58 * For the most reliable scan, set > AP beacon interval (typically 100msec). */
59#define IWL_PASSIVE_DWELL_TIME_24 (20) /* all times in msec */
60#define IWL_PASSIVE_DWELL_TIME_52 (10)
61#define IWL_PASSIVE_DWELL_BASE (100)
62#define IWL_CHANNEL_TUNE_TIME 5
63
fe905f1d
TW		 64#define IWL_SCAN_PROBE_MASK(n) cpu_to_le32((BIT(n) | (BIT(n) - BIT(1))))
65
66
f53696de
TW		 67static int scan_tx_ant[3] = {
68 RATE_MCS_ANT_A_MSK, RATE_MCS_ANT_B_MSK, RATE_MCS_ANT_C_MSK
69};
2a421b91 70
fe905f1d
TW		 71
72
2a421b91
TW		 73static int iwl_is_empty_essid(const char *essid, int essid_len)
74{
75 /* Single white space is for Linksys APs */
76 if (essid_len == 1 && essid[0] == ' ')
77 return 1;
78
79 /* Otherwise, if the entire essid is 0, we assume it is hidden */
80 while (essid_len) {
81 essid_len--;
82 if (essid[essid_len] != '\0')
83 return 0;
84 }
85
86 return 1;
87}
88
89
90
91const char *iwl_escape_essid(const char *essid, u8 essid_len)
92{
93 static char escaped[IW_ESSID_MAX_SIZE * 2 + 1];
94 const char *s = essid;
95 char *d = escaped;
96
97 if (iwl_is_empty_essid(essid, essid_len)) {
98 memcpy(escaped, "<hidden>", sizeof("<hidden>"));
99 return escaped;
100 }
101
102 essid_len = min(essid_len, (u8) IW_ESSID_MAX_SIZE);
103 while (essid_len--) {
104 if (*s == '\0') {
105 *d++ = '\\';
106 *d++ = '0';
107 s++;
108 } else
109 *d++ = *s++;
110 }
111 *d = '\0';
112 return escaped;
113}
114EXPORT_SYMBOL(iwl_escape_essid);
115
116/**
117 * iwl_scan_cancel - Cancel any currently executing HW scan
118 *
119 * NOTE: priv->mutex is not required before calling this function
120 */
121int iwl_scan_cancel(struct iwl_priv *priv)
122{
123 if (!test_bit(STATUS_SCAN_HW, &priv->status)) {
124 clear_bit(STATUS_SCANNING, &priv->status);
125 return 0;
126 }
127
128 if (test_bit(STATUS_SCANNING, &priv->status)) {
129 if (!test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
130 IWL_DEBUG_SCAN("Queuing scan abort.\n");
131 set_bit(STATUS_SCAN_ABORTING, &priv->status);
132 queue_work(priv->workqueue, &priv->abort_scan);
133
134 } else
135 IWL_DEBUG_SCAN("Scan abort already in progress.\n");
136
137 return test_bit(STATUS_SCANNING, &priv->status);
138 }
139
140 return 0;
141}
142EXPORT_SYMBOL(iwl_scan_cancel);
143/**
144 * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
145 * @ms: amount of time to wait (in milliseconds) for scan to abort
146 *
147 * NOTE: priv->mutex must be held before calling this function
148 */
149int iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
150{
151 unsigned long now = jiffies;
152 int ret;
153
154 ret = iwl_scan_cancel(priv);
155 if (ret && ms) {
156 mutex_unlock(&priv->mutex);
157 while (!time_after(jiffies, now + msecs_to_jiffies(ms)) &&
158 test_bit(STATUS_SCANNING, &priv->status))
159 msleep(1);
160 mutex_lock(&priv->mutex);
161
162 return test_bit(STATUS_SCANNING, &priv->status);
163 }
164
165 return ret;
166}
167EXPORT_SYMBOL(iwl_scan_cancel_timeout);
168
169static int iwl_send_scan_abort(struct iwl_priv *priv)
170{
171 int ret = 0;
172 struct iwl_rx_packet *res;
173 struct iwl_host_cmd cmd = {
174 .id = REPLY_SCAN_ABORT_CMD,
175 .meta.flags = CMD_WANT_SKB,
176 };
177
178 /* If there isn't a scan actively going on in the hardware
179 * then we are in between scan bands and not actually
180 * actively scanning, so don't send the abort command */
181 if (!test_bit(STATUS_SCAN_HW, &priv->status)) {
182 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
183 return 0;
184 }
185
186 ret = iwl_send_cmd_sync(priv, &cmd);
187 if (ret) {
188 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
189 return ret;
190 }
191
192 res = (struct iwl_rx_packet *)cmd.meta.u.skb->data;
193 if (res->u.status != CAN_ABORT_STATUS) {
194 /* The scan abort will return 1 for success or
195 * 2 for "failure". A failure condition can be
196 * due to simply not being in an active scan which
197 * can occur if we send the scan abort before we
198 * the microcode has notified us that a scan is
199 * completed. */
200 IWL_DEBUG_INFO("SCAN_ABORT returned %d.\n", res->u.status);
201 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
202 clear_bit(STATUS_SCAN_HW, &priv->status);
203 }
204
14652562 205 priv->alloc_rxb_skb--;
2a421b91
TW		 206 dev_kfree_skb_any(cmd.meta.u.skb);
207
208 return ret;
209}
210
211
212/* Service response to REPLY_SCAN_CMD (0x80) */
213static void iwl_rx_reply_scan(struct iwl_priv *priv,
214 struct iwl_rx_mem_buffer *rxb)
215{
216#ifdef CONFIG_IWLWIFI_DEBUG
217 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
218 struct iwl_scanreq_notification *notif =
219 (struct iwl_scanreq_notification *)pkt->u.raw;
220
221 IWL_DEBUG_RX("Scan request status = 0x%x\n", notif->status);
222#endif
223}
224
225/* Service SCAN_START_NOTIFICATION (0x82) */
226static void iwl_rx_scan_start_notif(struct iwl_priv *priv,
227 struct iwl_rx_mem_buffer *rxb)
228{
229 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
230 struct iwl_scanstart_notification *notif =
231 (struct iwl_scanstart_notification *)pkt->u.raw;
232 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
233 IWL_DEBUG_SCAN("Scan start: "
234 "%d [802.11%s] "
235 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
236 notif->channel,
237 notif->band ? "bg" : "a",
fe905f1d
TW		 238 le32_to_cpu(notif->tsf_high),
239 le32_to_cpu(notif->tsf_low),
240 notif->status, notif->beacon_timer);
2a421b91
TW		 241}
242
243/* Service SCAN_RESULTS_NOTIFICATION (0x83) */
244static void iwl_rx_scan_results_notif(struct iwl_priv *priv,
245 struct iwl_rx_mem_buffer *rxb)
246{
247#ifdef CONFIG_IWLWIFI_DEBUG
248 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
249 struct iwl_scanresults_notification *notif =
250 (struct iwl_scanresults_notification *)pkt->u.raw;
251
252 IWL_DEBUG_SCAN("Scan ch.res: "
253 "%d [802.11%s] "
254 "(TSF: 0x%08X:%08X) - %d "
255 "elapsed=%lu usec (%dms since last)\n",
256 notif->channel,
257 notif->band ? "bg" : "a",
258 le32_to_cpu(notif->tsf_high),
259 le32_to_cpu(notif->tsf_low),
260 le32_to_cpu(notif->statistics[0]),
261 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf,
262 jiffies_to_msecs(elapsed_jiffies
263 (priv->last_scan_jiffies, jiffies)));
264#endif
265
266 priv->last_scan_jiffies = jiffies;
267 priv->next_scan_jiffies = 0;
268}
269
270/* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
271static void iwl_rx_scan_complete_notif(struct iwl_priv *priv,
272 struct iwl_rx_mem_buffer *rxb)
273{
cb9289cb 274#ifdef CONFIG_IWLWIFI_DEBUG
2a421b91
TW		 275 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
276 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
277
278 IWL_DEBUG_SCAN("Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
279 scan_notif->scanned_channels,
280 scan_notif->tsf_low,
281 scan_notif->tsf_high, scan_notif->status);
cb9289cb 282#endif
2a421b91
TW		 283
284 /* The HW is no longer scanning */
285 clear_bit(STATUS_SCAN_HW, &priv->status);
286
287 /* The scan completion notification came in, so kill that timer... */
288 cancel_delayed_work(&priv->scan_check);
289
290 IWL_DEBUG_INFO("Scan pass on %sGHz took %dms\n",
1b63ba8a
DM		 291 (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) ?
292 "2.4" : "5.2",
2a421b91
TW		 293 jiffies_to_msecs(elapsed_jiffies
294 (priv->scan_pass_start, jiffies)));
295
1b63ba8a
DM		 296 /* Remove this scanned band from the list of pending
297 * bands to scan, band G precedes A in order of scanning
298 * as seen in iwl_bg_request_scan */
299 if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ))
300 priv->scan_bands &= ~BIT(IEEE80211_BAND_2GHZ);
301 else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ))
302 priv->scan_bands &= ~BIT(IEEE80211_BAND_5GHZ);
2a421b91
TW		 303
304 /* If a request to abort was given, or the scan did not succeed
305 * then we reset the scan state machine and terminate,
306 * re-queuing another scan if one has been requested */
307 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
308 IWL_DEBUG_INFO("Aborted scan completed.\n");
309 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
310 } else {
311 /* If there are more bands on this scan pass reschedule */
1b63ba8a 312 if (priv->scan_bands)
2a421b91
TW		 313 goto reschedule;
314 }
315
316 priv->last_scan_jiffies = jiffies;
317 priv->next_scan_jiffies = 0;
318 IWL_DEBUG_INFO("Setting scan to off\n");
319
320 clear_bit(STATUS_SCANNING, &priv->status);
321
322 IWL_DEBUG_INFO("Scan took %dms\n",
323 jiffies_to_msecs(elapsed_jiffies(priv->scan_start, jiffies)));
324
325 queue_work(priv->workqueue, &priv->scan_completed);
326
327 return;
328
329reschedule:
330 priv->scan_pass_start = jiffies;
331 queue_work(priv->workqueue, &priv->request_scan);
332}
333
334void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
335{
336 /* scan handlers */
337 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
338 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
339 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
340 iwl_rx_scan_results_notif;
341 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
342 iwl_rx_scan_complete_notif;
343}
344EXPORT_SYMBOL(iwl_setup_rx_scan_handlers);
345
346static inline u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
fe905f1d
TW		 347 enum ieee80211_band band,
348 u8 n_probes)
2a421b91
TW		 349{
350 if (band == IEEE80211_BAND_5GHZ)
fe905f1d
TW		 351 return IWL_ACTIVE_DWELL_TIME_52 +
352 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
2a421b91 353 else
fe905f1d
TW		 354 return IWL_ACTIVE_DWELL_TIME_24 +
355 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
2a421b91
TW		 356}
357
358static u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
fe905f1d 359 enum ieee80211_band band)
2a421b91 360{
fe905f1d 361 u16 passive = (band == IEEE80211_BAND_2GHZ) ?
2a421b91
TW		 362 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
363 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
364
365 if (iwl_is_associated(priv)) {
366 /* If we're associated, we clamp the maximum passive
367 * dwell time to be 98% of the beacon interval (minus
368 * 2 * channel tune time) */
369 passive = priv->beacon_int;
370 if ((passive > IWL_PASSIVE_DWELL_BASE) || !passive)
371 passive = IWL_PASSIVE_DWELL_BASE;
372 passive = (passive * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
373 }
374
2a421b91
TW		 375 return passive;
376}
377
378static int iwl_get_channels_for_scan(struct iwl_priv *priv,
379 enum ieee80211_band band,
fe905f1d 380 u8 is_active, u8 n_probes,
2a421b91
TW		 381 struct iwl_scan_channel *scan_ch)
382{
383 const struct ieee80211_channel *channels = NULL;
384 const struct ieee80211_supported_band *sband;
385 const struct iwl_channel_info *ch_info;
386 u16 passive_dwell = 0;
387 u16 active_dwell = 0;
388 int added, i;
d16dc48a 389 u16 channel;
2a421b91
TW		 390
391 sband = iwl_get_hw_mode(priv, band);
392 if (!sband)
393 return 0;
394
395 channels = sband->channels;
396
fe905f1d 397 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
2a421b91
TW		 398 passive_dwell = iwl_get_passive_dwell_time(priv, band);
399
fe905f1d
TW		 400 if (passive_dwell <= active_dwell)
401 passive_dwell = active_dwell + 1;
402
2a421b91
TW		 403 for (i = 0, added = 0; i < sband->n_channels; i++) {
404 if (channels[i].flags & IEEE80211_CHAN_DISABLED)
405 continue;
406
d16dc48a 407 channel =
2a421b91 408 ieee80211_frequency_to_channel(channels[i].center_freq);
d16dc48a 409 scan_ch->channel = cpu_to_le16(channel);
2a421b91 410
d16dc48a 411 ch_info = iwl_get_channel_info(priv, band, channel);
2a421b91 412 if (!is_channel_valid(ch_info)) {
1b63ba8a 413 IWL_DEBUG_SCAN("Channel %d is INVALID for this band.\n",
d16dc48a 414 channel);
2a421b91
TW		 415 continue;
416 }
417
418 if (!is_active || is_channel_passive(ch_info) ||
419 (channels[i].flags & IEEE80211_CHAN_PASSIVE_SCAN))
d16dc48a 420 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
2a421b91 421 else
d16dc48a 422 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
2a421b91 423
0ffe014a 424 if (n_probes)
fe905f1d 425 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
2a421b91
TW		 426
427 scan_ch->active_dwell = cpu_to_le16(active_dwell);
428 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
429
430 /* Set txpower levels to defaults */
f53696de 431 scan_ch->dsp_atten = 110;
2a421b91 432
fe905f1d
TW		 433 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
434 * power level:
435 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
436 */
2a421b91 437 if (band == IEEE80211_BAND_5GHZ)
f53696de 438 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
fe905f1d 439 else
f53696de 440 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
2a421b91 441
fe905f1d
TW		 442 IWL_DEBUG_SCAN("Scanning ch=%d prob=0x%X [%s %d]\n",
443 channel, le32_to_cpu(scan_ch->type),
d16dc48a
TW		 444 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
445 "ACTIVE" : "PASSIVE",
446 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
2a421b91
TW		 447 active_dwell : passive_dwell);
448
449 scan_ch++;
450 added++;
451 }
452
453 IWL_DEBUG_SCAN("total channels to scan %d \n", added);
454 return added;
455}
456
f53696de
TW		 457void iwl_init_scan_params(struct iwl_priv *priv)
458{
459 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
460 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = RATE_MCS_ANT_INIT_IND;
461 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
462 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = RATE_MCS_ANT_INIT_IND;
463}
464
2a421b91
TW		 465int iwl_scan_initiate(struct iwl_priv *priv)
466{
467 if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
468 IWL_ERROR("APs don't scan.\n");
469 return 0;
470 }
471
472 if (!iwl_is_ready_rf(priv)) {
473 IWL_DEBUG_SCAN("Aborting scan due to not ready.\n");
474 return -EIO;
475 }
476
477 if (test_bit(STATUS_SCANNING, &priv->status)) {
478 IWL_DEBUG_SCAN("Scan already in progress.\n");
479 return -EAGAIN;
480 }
481
482 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
483 IWL_DEBUG_SCAN("Scan request while abort pending. "
484 "Queuing.\n");
485 return -EAGAIN;
486 }
487
488 IWL_DEBUG_INFO("Starting scan...\n");
1b63ba8a
DM		 489 if (priv->cfg->sku & IWL_SKU_G)
490 priv->scan_bands |= BIT(IEEE80211_BAND_2GHZ);
491 if (priv->cfg->sku & IWL_SKU_A)
492 priv->scan_bands |= BIT(IEEE80211_BAND_5GHZ);
2a421b91
TW		 493 set_bit(STATUS_SCANNING, &priv->status);
494 priv->scan_start = jiffies;
495 priv->scan_pass_start = priv->scan_start;
496
497 queue_work(priv->workqueue, &priv->request_scan);
498
499 return 0;
500}
501EXPORT_SYMBOL(iwl_scan_initiate);
502
503#define IWL_SCAN_CHECK_WATCHDOG (7 * HZ)
504
505static void iwl_bg_scan_check(struct work_struct *data)
506{
507 struct iwl_priv *priv =
508 container_of(data, struct iwl_priv, scan_check.work);
509
510 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
511 return;
512
513 mutex_lock(&priv->mutex);
514 if (test_bit(STATUS_SCANNING, &priv->status) ||
515 test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
516 IWL_DEBUG(IWL_DL_SCAN, "Scan completion watchdog resetting "
517 "adapter (%dms)\n",
518 jiffies_to_msecs(IWL_SCAN_CHECK_WATCHDOG));
519
520 if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
521 iwl_send_scan_abort(priv);
522 }
523 mutex_unlock(&priv->mutex);
524}
525/**
526 * iwl_supported_rate_to_ie - fill in the supported rate in IE field
527 *
528 * return : set the bit for each supported rate insert in ie
529 */
530static u16 iwl_supported_rate_to_ie(u8 *ie, u16 supported_rate,
531 u16 basic_rate, int *left)
532{
533 u16 ret_rates = 0, bit;
534 int i;
535 u8 *cnt = ie;
536 u8 *rates = ie + 1;
537
538 for (bit = 1, i = 0; i < IWL_RATE_COUNT; i++, bit <<= 1) {
539 if (bit & supported_rate) {
540 ret_rates |= bit;
541 rates[*cnt] = iwl_rates[i].ieee |
542 ((bit & basic_rate) ? 0x80 : 0x00);
543 (*cnt)++;
544 (*left)--;
545 if ((*left <= 0) ||
546 (*cnt >= IWL_SUPPORTED_RATES_IE_LEN))
547 break;
548 }
549 }
550
551 return ret_rates;
552}
553
554
555static void iwl_ht_cap_to_ie(const struct ieee80211_supported_band *sband,
f53696de 556 u8 *pos, int *left)
2a421b91
TW		 557{
558 struct ieee80211_ht_cap *ht_cap;
559
560 if (!sband || !sband->ht_info.ht_supported)
561 return;
562
563 if (*left < sizeof(struct ieee80211_ht_cap))
564 return;
565
566 *pos++ = sizeof(struct ieee80211_ht_cap);
567 ht_cap = (struct ieee80211_ht_cap *) pos;
568
569 ht_cap->cap_info = cpu_to_le16(sband->ht_info.cap);
570 memcpy(ht_cap->supp_mcs_set, sband->ht_info.supp_mcs_set, 16);
571 ht_cap->ampdu_params_info =
572 (sband->ht_info.ampdu_factor & IEEE80211_HT_CAP_AMPDU_FACTOR) |
573 ((sband->ht_info.ampdu_density << 2) &
574 IEEE80211_HT_CAP_AMPDU_DENSITY);
575 *left -= sizeof(struct ieee80211_ht_cap);
576}
577
578/**
579 * iwl_fill_probe_req - fill in all required fields and IE for probe request
580 */
f53696de 581
2a421b91
TW		 582static u16 iwl_fill_probe_req(struct iwl_priv *priv,
583 enum ieee80211_band band,
584 struct ieee80211_mgmt *frame,
f53696de 585 int left)
2a421b91
TW		 586{
587 int len = 0;
588 u8 *pos = NULL;
589 u16 active_rates, ret_rates, cck_rates, active_rate_basic;
590 const struct ieee80211_supported_band *sband =
591 iwl_get_hw_mode(priv, band);
592
f53696de 593
2a421b91
TW		 594 /* Make sure there is enough space for the probe request,
595 * two mandatory IEs and the data */
596 left -= 24;
597 if (left < 0)
598 return 0;
2a421b91
TW		 599
600 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
601 memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
602 memcpy(frame->sa, priv->mac_addr, ETH_ALEN);
603 memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
604 frame->seq_ctrl = 0;
605
f53696de
TW		 606 len += 24;
607
2a421b91 608 /* ...next IE... */
f53696de 609 pos = &frame->u.probe_req.variable[0];
2a421b91 610
f53696de 611 /* fill in our indirect SSID IE */
2a421b91
TW		 612 left -= 2;
613 if (left < 0)
614 return 0;
2a421b91
TW		 615 *pos++ = WLAN_EID_SSID;
616 *pos++ = 0;
617
f53696de 618 len += 2;
2a421b91
TW		 619
620 /* fill in supported rate */
2a421b91
TW		 621 left -= 2;
622 if (left < 0)
623 return 0;
624
2a421b91
TW		 625 *pos++ = WLAN_EID_SUPP_RATES;
626 *pos = 0;
627
628 /* exclude 60M rate */
629 active_rates = priv->rates_mask;
630 active_rates &= ~IWL_RATE_60M_MASK;
631
632 active_rate_basic = active_rates & IWL_BASIC_RATES_MASK;
633
634 cck_rates = IWL_CCK_RATES_MASK & active_rates;
635 ret_rates = iwl_supported_rate_to_ie(pos, cck_rates,
f53696de 636 active_rate_basic, &left);
2a421b91
TW		 637 active_rates &= ~ret_rates;
638
639 ret_rates = iwl_supported_rate_to_ie(pos, active_rates,
f53696de 640 active_rate_basic, &left);
2a421b91
TW		 641 active_rates &= ~ret_rates;
642
643 len += 2 + *pos;
644 pos += (*pos) + 1;
f53696de 645
2a421b91
TW		 646 if (active_rates == 0)
647 goto fill_end;
648
649 /* fill in supported extended rate */
650 /* ...next IE... */
651 left -= 2;
652 if (left < 0)
653 return 0;
654 /* ... fill it in... */
655 *pos++ = WLAN_EID_EXT_SUPP_RATES;
656 *pos = 0;
f53696de
TW		 657 iwl_supported_rate_to_ie(pos, active_rates, active_rate_basic, &left);
658 if (*pos > 0) {
2a421b91 659 len += 2 + *pos;
f53696de
TW		 660 pos += (*pos) + 1;
661 } else {
662 pos--;
663 }
2a421b91
TW		 664
665 fill_end:
f53696de 666
2a421b91
TW		 667 left -= 2;
668 if (left < 0)
669 return 0;
670
671 *pos++ = WLAN_EID_HT_CAPABILITY;
672 *pos = 0;
2a421b91 673 iwl_ht_cap_to_ie(sband, pos, &left);
2a421b91
TW		 674 if (*pos > 0)
675 len += 2 + *pos;
f53696de 676
2a421b91
TW		 677 return (u16)len;
678}
679
f53696de
TW		 680static u32 iwl_scan_tx_ant(struct iwl_priv *priv, enum ieee80211_band band)
681{
682 int i, ind;
683
684 ind = priv->scan_tx_ant[band];
685 for (i = 0; i < priv->hw_params.tx_chains_num; i++) {
686 ind = (ind+1) >= priv->hw_params.tx_chains_num ? 0 : ind+1;
687 if (priv->hw_params.valid_tx_ant & (1 << ind)) {
688 priv->scan_tx_ant[band] = ind;
689 break;
690 }
691 }
fe905f1d 692 IWL_DEBUG_SCAN("select TX ANT = %c\n", 'A' + ind);
f53696de
TW		 693 return scan_tx_ant[ind];
694}
695
696
2a421b91
TW		 697static void iwl_bg_request_scan(struct work_struct *data)
698{
699 struct iwl_priv *priv =
700 container_of(data, struct iwl_priv, request_scan);
701 struct iwl_host_cmd cmd = {
702 .id = REPLY_SCAN_CMD,
703 .len = sizeof(struct iwl_scan_cmd),
704 .meta.flags = CMD_SIZE_HUGE,
705 };
706 struct iwl_scan_cmd *scan;
707 struct ieee80211_conf *conf = NULL;
f53696de
TW		 708 int ret = 0;
709 u32 tx_ant;
2a421b91
TW		 710 u16 cmd_len;
711 enum ieee80211_band band;
fe905f1d 712 u8 n_probes = 2;
f53696de 713 u8 rx_chain = 0x7; /* bitmap: ABC chains */
2a421b91
TW		 714
715 conf = ieee80211_get_hw_conf(priv->hw);
716
717 mutex_lock(&priv->mutex);
718
719 if (!iwl_is_ready(priv)) {
720 IWL_WARNING("request scan called when driver not ready.\n");
721 goto done;
722 }
723
724 /* Make sure the scan wasn't cancelled before this queued work
725 * was given the chance to run... */
726 if (!test_bit(STATUS_SCANNING, &priv->status))
727 goto done;
728
729 /* This should never be called or scheduled if there is currently
730 * a scan active in the hardware. */
731 if (test_bit(STATUS_SCAN_HW, &priv->status)) {
732 IWL_DEBUG_INFO("Multiple concurrent scan requests in parallel. "
733 "Ignoring second request.\n");
734 ret = -EIO;
735 goto done;
736 }
737
738 if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
739 IWL_DEBUG_SCAN("Aborting scan due to device shutdown\n");
740 goto done;
741 }
742
743 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
744 IWL_DEBUG_HC("Scan request while abort pending. Queuing.\n");
745 goto done;
746 }
747
748 if (iwl_is_rfkill(priv)) {
749 IWL_DEBUG_HC("Aborting scan due to RF Kill activation\n");
750 goto done;
751 }
752
753 if (!test_bit(STATUS_READY, &priv->status)) {
754 IWL_DEBUG_HC("Scan request while uninitialized. Queuing.\n");
755 goto done;
756 }
757
758 if (!priv->scan_bands) {
759 IWL_DEBUG_HC("Aborting scan due to no requested bands\n");
760 goto done;
761 }
762
763 if (!priv->scan) {
764 priv->scan = kmalloc(sizeof(struct iwl_scan_cmd) +
765 IWL_MAX_SCAN_SIZE, GFP_KERNEL);
766 if (!priv->scan) {
767 ret = -ENOMEM;
768 goto done;
769 }
770 }
771 scan = priv->scan;
772 memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE);
773
774 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
775 scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
776
777 if (iwl_is_associated(priv)) {
778 u16 interval = 0;
779 u32 extra;
780 u32 suspend_time = 100;
781 u32 scan_suspend_time = 100;
782 unsigned long flags;
783
784 IWL_DEBUG_INFO("Scanning while associated...\n");
785
786 spin_lock_irqsave(&priv->lock, flags);
787 interval = priv->beacon_int;
788 spin_unlock_irqrestore(&priv->lock, flags);
789
790 scan->suspend_time = 0;
791 scan->max_out_time = cpu_to_le32(200 * 1024);
792 if (!interval)
793 interval = suspend_time;
794
795 extra = (suspend_time / interval) << 22;
796 scan_suspend_time = (extra |
797 ((suspend_time % interval) * 1024));
798 scan->suspend_time = cpu_to_le32(scan_suspend_time);
799 IWL_DEBUG_SCAN("suspend_time 0x%X beacon interval %d\n",
800 scan_suspend_time, interval);
801 }
802
803 /* We should add the ability for user to lock to PASSIVE ONLY */
804 if (priv->one_direct_scan) {
f53696de
TW		 805 IWL_DEBUG_SCAN("Start direct scan for '%s'\n",
806 iwl_escape_essid(priv->direct_ssid,
807 priv->direct_ssid_len));
2a421b91
TW		 808 scan->direct_scan[0].id = WLAN_EID_SSID;
809 scan->direct_scan[0].len = priv->direct_ssid_len;
810 memcpy(scan->direct_scan[0].ssid,
811 priv->direct_ssid, priv->direct_ssid_len);
fe905f1d 812 n_probes++;
2a421b91 813 } else if (!iwl_is_associated(priv) && priv->essid_len) {
f53696de
TW		 814 IWL_DEBUG_SCAN("Start direct scan for '%s' (not associated)\n",
815 iwl_escape_essid(priv->essid, priv->essid_len));
2a421b91
TW		 816 scan->direct_scan[0].id = WLAN_EID_SSID;
817 scan->direct_scan[0].len = priv->essid_len;
818 memcpy(scan->direct_scan[0].ssid, priv->essid, priv->essid_len);
fe905f1d 819 n_probes++;
2a421b91 820 } else {
f53696de 821 IWL_DEBUG_SCAN("Start indirect scan.\n");
2a421b91
TW		 822 }
823
824 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
825 scan->tx_cmd.sta_id = priv->hw_params.bcast_sta_id;
826 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
827
828
1b63ba8a 829 if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) {
f53696de 830 band = IEEE80211_BAND_2GHZ;
2a421b91 831 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
f53696de
TW		 832 tx_ant = iwl_scan_tx_ant(priv, band);
833 if (priv->active_rxon.flags & RXON_FLG_CHANNEL_MODE_PURE_40_MSK)
834 scan->tx_cmd.rate_n_flags =
835 iwl_hw_set_rate_n_flags(IWL_RATE_6M_PLCP,
836 tx_ant);
837 else
838 scan->tx_cmd.rate_n_flags =
e7d326ac 839 iwl_hw_set_rate_n_flags(IWL_RATE_1M_PLCP,
f53696de 840 tx_ant |
e7d326ac 841 RATE_MCS_CCK_MSK);
2a421b91 842 scan->good_CRC_th = 0;
1b63ba8a 843 } else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ)) {
f53696de
TW		 844 band = IEEE80211_BAND_5GHZ;
845 tx_ant = iwl_scan_tx_ant(priv, band);
2a421b91 846 scan->tx_cmd.rate_n_flags =
e7d326ac 847 iwl_hw_set_rate_n_flags(IWL_RATE_6M_PLCP,
f53696de 848 tx_ant);
2a421b91 849 scan->good_CRC_th = IWL_GOOD_CRC_TH;
2a421b91 850
f53696de
TW		 851 /* Force use of chains B and C (0x6) for scan Rx for 4965
852 * Avoid A (0x1) because of its off-channel reception on A-band.
853 * MIMO is not used here, but value is required */
854 if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965)
855 rx_chain = 0x6;
1b63ba8a 856 } else {
2a421b91
TW		 857 IWL_WARNING("Invalid scan band count\n");
858 goto done;
859 }
860
f53696de
TW		 861 scan->rx_chain = RXON_RX_CHAIN_DRIVER_FORCE_MSK |
862 cpu_to_le16((0x7 << RXON_RX_CHAIN_VALID_POS) |
863 (rx_chain << RXON_RX_CHAIN_FORCE_SEL_POS) |
864 (0x7 << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS));
865
2a421b91 866 cmd_len = iwl_fill_probe_req(priv, band,
f53696de
TW		 867 (struct ieee80211_mgmt *)scan->data,
868 IWL_MAX_SCAN_SIZE - sizeof(*scan));
2a421b91
TW		 869
870 scan->tx_cmd.len = cpu_to_le16(cmd_len);
2a421b91
TW		 871
872 if (priv->iw_mode == IEEE80211_IF_TYPE_MNTR)
873 scan->filter_flags = RXON_FILTER_PROMISC_MSK;
874
f53696de
TW		 875 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
876 RXON_FILTER_BCON_AWARE_MSK);
877
fe905f1d
TW		 878 scan->channel_count =
879 iwl_get_channels_for_scan(priv, band, 1, /* active */
880 n_probes,
881 (void *)&scan->data[le16_to_cpu(scan->tx_cmd.len)]);
882
f53696de
TW		 883 if (scan->channel_count == 0) {
884 IWL_DEBUG_SCAN("channel count %d\n", scan->channel_count);
885 goto done;
886 }
2a421b91 887
2a421b91
TW		 888 cmd.len += le16_to_cpu(scan->tx_cmd.len) +
889 scan->channel_count * sizeof(struct iwl_scan_channel);
890 cmd.data = scan;
891 scan->len = cpu_to_le16(cmd.len);
892
893 set_bit(STATUS_SCAN_HW, &priv->status);
894 ret = iwl_send_cmd_sync(priv, &cmd);
895 if (ret)
896 goto done;
897
898 queue_delayed_work(priv->workqueue, &priv->scan_check,
899 IWL_SCAN_CHECK_WATCHDOG);
900
901 mutex_unlock(&priv->mutex);
902 return;
903
904 done:
905 /* inform mac80211 scan aborted */
906 queue_work(priv->workqueue, &priv->scan_completed);
907 mutex_unlock(&priv->mutex);
908}
909
910static void iwl_bg_abort_scan(struct work_struct *work)
911{
912 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
913
914 if (!iwl_is_ready(priv))
915 return;
916
917 mutex_lock(&priv->mutex);
918
919 set_bit(STATUS_SCAN_ABORTING, &priv->status);
920 iwl_send_scan_abort(priv);
921
922 mutex_unlock(&priv->mutex);
923}
924
925void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
926{
927 /* FIXME: move here when resolved PENDING
928 * INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed); */
929 INIT_WORK(&priv->request_scan, iwl_bg_request_scan);
930 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
931 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
932}
933EXPORT_SYMBOL(iwl_setup_scan_deferred_work);
934
Linux kernel - Deliverables
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