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