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Diffstat (limited to 'drivers/net/wireless/iwlegacy/iwl-scan.c')
-rw-r--r--drivers/net/wireless/iwlegacy/iwl-scan.c550
1 files changed, 0 insertions, 550 deletions
diff --git a/drivers/net/wireless/iwlegacy/iwl-scan.c b/drivers/net/wireless/iwlegacy/iwl-scan.c
deleted file mode 100644
index 521b73b527d..00000000000
--- a/drivers/net/wireless/iwlegacy/iwl-scan.c
+++ /dev/null
@@ -1,550 +0,0 @@
1/******************************************************************************
2 *
3 * GPL LICENSE SUMMARY
4 *
5 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of version 2 of the GNU General Public License as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
19 * USA
20 *
21 * The full GNU General Public License is included in this distribution
22 * in the file called LICENSE.GPL.
23 *
24 * Contact Information:
25 * Intel Linux Wireless <ilw@linux.intel.com>
26 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
27 *****************************************************************************/
28#include <linux/slab.h>
29#include <linux/types.h>
30#include <linux/etherdevice.h>
31#include <linux/export.h>
32#include <net/mac80211.h>
33
34#include "iwl-eeprom.h"
35#include "iwl-dev.h"
36#include "iwl-core.h"
37#include "iwl-sta.h"
38#include "iwl-io.h"
39#include "iwl-helpers.h"
40
41/* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
42 * sending probe req. This should be set long enough to hear probe responses
43 * from more than one AP. */
44#define IWL_ACTIVE_DWELL_TIME_24 (30) /* all times in msec */
45#define IWL_ACTIVE_DWELL_TIME_52 (20)
46
47#define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3)
48#define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2)
49
50/* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
51 * Must be set longer than active dwell time.
52 * For the most reliable scan, set > AP beacon interval (typically 100msec). */
53#define IWL_PASSIVE_DWELL_TIME_24 (20) /* all times in msec */
54#define IWL_PASSIVE_DWELL_TIME_52 (10)
55#define IWL_PASSIVE_DWELL_BASE (100)
56#define IWL_CHANNEL_TUNE_TIME 5
57
58static int iwl_legacy_send_scan_abort(struct iwl_priv *priv)
59{
60 int ret;
61 struct iwl_rx_packet *pkt;
62 struct iwl_host_cmd cmd = {
63 .id = REPLY_SCAN_ABORT_CMD,
64 .flags = CMD_WANT_SKB,
65 };
66
67 /* Exit instantly with error when device is not ready
68 * to receive scan abort command or it does not perform
69 * hardware scan currently */
70 if (!test_bit(STATUS_READY, &priv->status) ||
71 !test_bit(STATUS_GEO_CONFIGURED, &priv->status) ||
72 !test_bit(STATUS_SCAN_HW, &priv->status) ||
73 test_bit(STATUS_FW_ERROR, &priv->status) ||
74 test_bit(STATUS_EXIT_PENDING, &priv->status))
75 return -EIO;
76
77 ret = iwl_legacy_send_cmd_sync(priv, &cmd);
78 if (ret)
79 return ret;
80
81 pkt = (struct iwl_rx_packet *)cmd.reply_page;
82 if (pkt->u.status != CAN_ABORT_STATUS) {
83 /* The scan abort will return 1 for success or
84 * 2 for "failure". A failure condition can be
85 * due to simply not being in an active scan which
86 * can occur if we send the scan abort before we
87 * the microcode has notified us that a scan is
88 * completed. */
89 IWL_DEBUG_SCAN(priv, "SCAN_ABORT ret %d.\n", pkt->u.status);
90 ret = -EIO;
91 }
92
93 iwl_legacy_free_pages(priv, cmd.reply_page);
94 return ret;
95}
96
97static void iwl_legacy_complete_scan(struct iwl_priv *priv, bool aborted)
98{
99 /* check if scan was requested from mac80211 */
100 if (priv->scan_request) {
101 IWL_DEBUG_SCAN(priv, "Complete scan in mac80211\n");
102 ieee80211_scan_completed(priv->hw, aborted);
103 }
104
105 priv->scan_vif = NULL;
106 priv->scan_request = NULL;
107}
108
109void iwl_legacy_force_scan_end(struct iwl_priv *priv)
110{
111 lockdep_assert_held(&priv->mutex);
112
113 if (!test_bit(STATUS_SCANNING, &priv->status)) {
114 IWL_DEBUG_SCAN(priv, "Forcing scan end while not scanning\n");
115 return;
116 }
117
118 IWL_DEBUG_SCAN(priv, "Forcing scan end\n");
119 clear_bit(STATUS_SCANNING, &priv->status);
120 clear_bit(STATUS_SCAN_HW, &priv->status);
121 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
122 iwl_legacy_complete_scan(priv, true);
123}
124
125static void iwl_legacy_do_scan_abort(struct iwl_priv *priv)
126{
127 int ret;
128
129 lockdep_assert_held(&priv->mutex);
130
131 if (!test_bit(STATUS_SCANNING, &priv->status)) {
132 IWL_DEBUG_SCAN(priv, "Not performing scan to abort\n");
133 return;
134 }
135
136 if (test_and_set_bit(STATUS_SCAN_ABORTING, &priv->status)) {
137 IWL_DEBUG_SCAN(priv, "Scan abort in progress\n");
138 return;
139 }
140
141 ret = iwl_legacy_send_scan_abort(priv);
142 if (ret) {
143 IWL_DEBUG_SCAN(priv, "Send scan abort failed %d\n", ret);
144 iwl_legacy_force_scan_end(priv);
145 } else
146 IWL_DEBUG_SCAN(priv, "Successfully send scan abort\n");
147}
148
149/**
150 * iwl_scan_cancel - Cancel any currently executing HW scan
151 */
152int iwl_legacy_scan_cancel(struct iwl_priv *priv)
153{
154 IWL_DEBUG_SCAN(priv, "Queuing abort scan\n");
155 queue_work(priv->workqueue, &priv->abort_scan);
156 return 0;
157}
158EXPORT_SYMBOL(iwl_legacy_scan_cancel);
159
160/**
161 * iwl_legacy_scan_cancel_timeout - Cancel any currently executing HW scan
162 * @ms: amount of time to wait (in milliseconds) for scan to abort
163 *
164 */
165int iwl_legacy_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
166{
167 unsigned long timeout = jiffies + msecs_to_jiffies(ms);
168
169 lockdep_assert_held(&priv->mutex);
170
171 IWL_DEBUG_SCAN(priv, "Scan cancel timeout\n");
172
173 iwl_legacy_do_scan_abort(priv);
174
175 while (time_before_eq(jiffies, timeout)) {
176 if (!test_bit(STATUS_SCAN_HW, &priv->status))
177 break;
178 msleep(20);
179 }
180
181 return test_bit(STATUS_SCAN_HW, &priv->status);
182}
183EXPORT_SYMBOL(iwl_legacy_scan_cancel_timeout);
184
185/* Service response to REPLY_SCAN_CMD (0x80) */
186static void iwl_legacy_rx_reply_scan(struct iwl_priv *priv,
187 struct iwl_rx_mem_buffer *rxb)
188{
189#ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
190 struct iwl_rx_packet *pkt = rxb_addr(rxb);
191 struct iwl_scanreq_notification *notif =
192 (struct iwl_scanreq_notification *)pkt->u.raw;
193
194 IWL_DEBUG_SCAN(priv, "Scan request status = 0x%x\n", notif->status);
195#endif
196}
197
198/* Service SCAN_START_NOTIFICATION (0x82) */
199static void iwl_legacy_rx_scan_start_notif(struct iwl_priv *priv,
200 struct iwl_rx_mem_buffer *rxb)
201{
202 struct iwl_rx_packet *pkt = rxb_addr(rxb);
203 struct iwl_scanstart_notification *notif =
204 (struct iwl_scanstart_notification *)pkt->u.raw;
205 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
206 IWL_DEBUG_SCAN(priv, "Scan start: "
207 "%d [802.11%s] "
208 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
209 notif->channel,
210 notif->band ? "bg" : "a",
211 le32_to_cpu(notif->tsf_high),
212 le32_to_cpu(notif->tsf_low),
213 notif->status, notif->beacon_timer);
214}
215
216/* Service SCAN_RESULTS_NOTIFICATION (0x83) */
217static void iwl_legacy_rx_scan_results_notif(struct iwl_priv *priv,
218 struct iwl_rx_mem_buffer *rxb)
219{
220#ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
221 struct iwl_rx_packet *pkt = rxb_addr(rxb);
222 struct iwl_scanresults_notification *notif =
223 (struct iwl_scanresults_notification *)pkt->u.raw;
224
225 IWL_DEBUG_SCAN(priv, "Scan ch.res: "
226 "%d [802.11%s] "
227 "(TSF: 0x%08X:%08X) - %d "
228 "elapsed=%lu usec\n",
229 notif->channel,
230 notif->band ? "bg" : "a",
231 le32_to_cpu(notif->tsf_high),
232 le32_to_cpu(notif->tsf_low),
233 le32_to_cpu(notif->statistics[0]),
234 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf);
235#endif
236}
237
238/* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
239static void iwl_legacy_rx_scan_complete_notif(struct iwl_priv *priv,
240 struct iwl_rx_mem_buffer *rxb)
241{
242
243#ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
244 struct iwl_rx_packet *pkt = rxb_addr(rxb);
245 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
246#endif
247
248 IWL_DEBUG_SCAN(priv,
249 "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
250 scan_notif->scanned_channels,
251 scan_notif->tsf_low,
252 scan_notif->tsf_high, scan_notif->status);
253
254 /* The HW is no longer scanning */
255 clear_bit(STATUS_SCAN_HW, &priv->status);
256
257 IWL_DEBUG_SCAN(priv, "Scan on %sGHz took %dms\n",
258 (priv->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2",
259 jiffies_to_msecs(jiffies - priv->scan_start));
260
261 queue_work(priv->workqueue, &priv->scan_completed);
262}
263
264void iwl_legacy_setup_rx_scan_handlers(struct iwl_priv *priv)
265{
266 /* scan handlers */
267 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_legacy_rx_reply_scan;
268 priv->rx_handlers[SCAN_START_NOTIFICATION] =
269 iwl_legacy_rx_scan_start_notif;
270 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
271 iwl_legacy_rx_scan_results_notif;
272 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
273 iwl_legacy_rx_scan_complete_notif;
274}
275EXPORT_SYMBOL(iwl_legacy_setup_rx_scan_handlers);
276
277inline u16 iwl_legacy_get_active_dwell_time(struct iwl_priv *priv,
278 enum ieee80211_band band,
279 u8 n_probes)
280{
281 if (band == IEEE80211_BAND_5GHZ)
282 return IWL_ACTIVE_DWELL_TIME_52 +
283 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
284 else
285 return IWL_ACTIVE_DWELL_TIME_24 +
286 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
287}
288EXPORT_SYMBOL(iwl_legacy_get_active_dwell_time);
289
290u16 iwl_legacy_get_passive_dwell_time(struct iwl_priv *priv,
291 enum ieee80211_band band,
292 struct ieee80211_vif *vif)
293{
294 struct iwl_rxon_context *ctx;
295 u16 passive = (band == IEEE80211_BAND_2GHZ) ?
296 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
297 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
298
299 if (iwl_legacy_is_any_associated(priv)) {
300 /*
301 * If we're associated, we clamp the maximum passive
302 * dwell time to be 98% of the smallest beacon interval
303 * (minus 2 * channel tune time)
304 */
305 for_each_context(priv, ctx) {
306 u16 value;
307
308 if (!iwl_legacy_is_associated_ctx(ctx))
309 continue;
310 value = ctx->vif ? ctx->vif->bss_conf.beacon_int : 0;
311 if ((value > IWL_PASSIVE_DWELL_BASE) || !value)
312 value = IWL_PASSIVE_DWELL_BASE;
313 value = (value * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
314 passive = min(value, passive);
315 }
316 }
317
318 return passive;
319}
320EXPORT_SYMBOL(iwl_legacy_get_passive_dwell_time);
321
322void iwl_legacy_init_scan_params(struct iwl_priv *priv)
323{
324 u8 ant_idx = fls(priv->hw_params.valid_tx_ant) - 1;
325 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
326 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
327 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
328 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
329}
330EXPORT_SYMBOL(iwl_legacy_init_scan_params);
331
332static int iwl_legacy_scan_initiate(struct iwl_priv *priv,
333 struct ieee80211_vif *vif)
334{
335 int ret;
336
337 lockdep_assert_held(&priv->mutex);
338
339 if (WARN_ON(!priv->cfg->ops->utils->request_scan))
340 return -EOPNOTSUPP;
341
342 cancel_delayed_work(&priv->scan_check);
343
344 if (!iwl_legacy_is_ready_rf(priv)) {
345 IWL_WARN(priv, "Request scan called when driver not ready.\n");
346 return -EIO;
347 }
348
349 if (test_bit(STATUS_SCAN_HW, &priv->status)) {
350 IWL_DEBUG_SCAN(priv,
351 "Multiple concurrent scan requests in parallel.\n");
352 return -EBUSY;
353 }
354
355 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
356 IWL_DEBUG_SCAN(priv, "Scan request while abort pending.\n");
357 return -EBUSY;
358 }
359
360 IWL_DEBUG_SCAN(priv, "Starting scan...\n");
361
362 set_bit(STATUS_SCANNING, &priv->status);
363 priv->scan_start = jiffies;
364
365 ret = priv->cfg->ops->utils->request_scan(priv, vif);
366 if (ret) {
367 clear_bit(STATUS_SCANNING, &priv->status);
368 return ret;
369 }
370
371 queue_delayed_work(priv->workqueue, &priv->scan_check,
372 IWL_SCAN_CHECK_WATCHDOG);
373
374 return 0;
375}
376
377int iwl_legacy_mac_hw_scan(struct ieee80211_hw *hw,
378 struct ieee80211_vif *vif,
379 struct cfg80211_scan_request *req)
380{
381 struct iwl_priv *priv = hw->priv;
382 int ret;
383
384 IWL_DEBUG_MAC80211(priv, "enter\n");
385
386 if (req->n_channels == 0)
387 return -EINVAL;
388
389 mutex_lock(&priv->mutex);
390
391 if (test_bit(STATUS_SCANNING, &priv->status)) {
392 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
393 ret = -EAGAIN;
394 goto out_unlock;
395 }
396
397 /* mac80211 will only ask for one band at a time */
398 priv->scan_request = req;
399 priv->scan_vif = vif;
400 priv->scan_band = req->channels[0]->band;
401
402 ret = iwl_legacy_scan_initiate(priv, vif);
403
404 IWL_DEBUG_MAC80211(priv, "leave\n");
405
406out_unlock:
407 mutex_unlock(&priv->mutex);
408
409 return ret;
410}
411EXPORT_SYMBOL(iwl_legacy_mac_hw_scan);
412
413static void iwl_legacy_bg_scan_check(struct work_struct *data)
414{
415 struct iwl_priv *priv =
416 container_of(data, struct iwl_priv, scan_check.work);
417
418 IWL_DEBUG_SCAN(priv, "Scan check work\n");
419
420 /* Since we are here firmware does not finish scan and
421 * most likely is in bad shape, so we don't bother to
422 * send abort command, just force scan complete to mac80211 */
423 mutex_lock(&priv->mutex);
424 iwl_legacy_force_scan_end(priv);
425 mutex_unlock(&priv->mutex);
426}
427
428/**
429 * iwl_legacy_fill_probe_req - fill in all required fields and IE for probe request
430 */
431
432u16
433iwl_legacy_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame,
434 const u8 *ta, const u8 *ies, int ie_len, int left)
435{
436 int len = 0;
437 u8 *pos = NULL;
438
439 /* Make sure there is enough space for the probe request,
440 * two mandatory IEs and the data */
441 left -= 24;
442 if (left < 0)
443 return 0;
444
445 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
446 memcpy(frame->da, iwlegacy_bcast_addr, ETH_ALEN);
447 memcpy(frame->sa, ta, ETH_ALEN);
448 memcpy(frame->bssid, iwlegacy_bcast_addr, ETH_ALEN);
449 frame->seq_ctrl = 0;
450
451 len += 24;
452
453 /* ...next IE... */
454 pos = &frame->u.probe_req.variable[0];
455
456 /* fill in our indirect SSID IE */
457 left -= 2;
458 if (left < 0)
459 return 0;
460 *pos++ = WLAN_EID_SSID;
461 *pos++ = 0;
462
463 len += 2;
464
465 if (WARN_ON(left < ie_len))
466 return len;
467
468 if (ies && ie_len) {
469 memcpy(pos, ies, ie_len);
470 len += ie_len;
471 }
472
473 return (u16)len;
474}
475EXPORT_SYMBOL(iwl_legacy_fill_probe_req);
476
477static void iwl_legacy_bg_abort_scan(struct work_struct *work)
478{
479 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
480
481 IWL_DEBUG_SCAN(priv, "Abort scan work\n");
482
483 /* We keep scan_check work queued in case when firmware will not
484 * report back scan completed notification */
485 mutex_lock(&priv->mutex);
486 iwl_legacy_scan_cancel_timeout(priv, 200);
487 mutex_unlock(&priv->mutex);
488}
489
490static void iwl_legacy_bg_scan_completed(struct work_struct *work)
491{
492 struct iwl_priv *priv =
493 container_of(work, struct iwl_priv, scan_completed);
494 bool aborted;
495
496 IWL_DEBUG_SCAN(priv, "Completed scan.\n");
497
498 cancel_delayed_work(&priv->scan_check);
499
500 mutex_lock(&priv->mutex);
501
502 aborted = test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->status);
503 if (aborted)
504 IWL_DEBUG_SCAN(priv, "Aborted scan completed.\n");
505
506 if (!test_and_clear_bit(STATUS_SCANNING, &priv->status)) {
507 IWL_DEBUG_SCAN(priv, "Scan already completed.\n");
508 goto out_settings;
509 }
510
511 iwl_legacy_complete_scan(priv, aborted);
512
513out_settings:
514 /* Can we still talk to firmware ? */
515 if (!iwl_legacy_is_ready_rf(priv))
516 goto out;
517
518 /*
519 * We do not commit power settings while scan is pending,
520 * do it now if the settings changed.
521 */
522 iwl_legacy_power_set_mode(priv, &priv->power_data.sleep_cmd_next, false);
523 iwl_legacy_set_tx_power(priv, priv->tx_power_next, false);
524
525 priv->cfg->ops->utils->post_scan(priv);
526
527out:
528 mutex_unlock(&priv->mutex);
529}
530
531void iwl_legacy_setup_scan_deferred_work(struct iwl_priv *priv)
532{
533 INIT_WORK(&priv->scan_completed, iwl_legacy_bg_scan_completed);
534 INIT_WORK(&priv->abort_scan, iwl_legacy_bg_abort_scan);
535 INIT_DELAYED_WORK(&priv->scan_check, iwl_legacy_bg_scan_check);
536}
537EXPORT_SYMBOL(iwl_legacy_setup_scan_deferred_work);
538
539void iwl_legacy_cancel_scan_deferred_work(struct iwl_priv *priv)
540{
541 cancel_work_sync(&priv->abort_scan);
542 cancel_work_sync(&priv->scan_completed);
543
544 if (cancel_delayed_work_sync(&priv->scan_check)) {
545 mutex_lock(&priv->mutex);
546 iwl_legacy_force_scan_end(priv);
547 mutex_unlock(&priv->mutex);
548 }
549}
550EXPORT_SYMBOL(iwl_legacy_cancel_scan_deferred_work);
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-14 23:49:38 -0500