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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 |
61 | static 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 | |
65 | static 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 | ||
83 | const 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 | } | |
106 | EXPORT_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 | */ | |
113 | int 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 | } | |
134 | EXPORT_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 | */ | |
141 | int 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 | } | |
159 | EXPORT_SYMBOL(iwl_scan_cancel_timeout); | |
160 | ||
161 | static 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) */ | |
204 | static 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) */ | |
217 | static 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) */ | |
234 | static 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) */ | |
261 | static 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 | ||
317 | reschedule: | |
318 | priv->scan_pass_start = jiffies; | |
319 | queue_work(priv->workqueue, &priv->request_scan); | |
320 | } | |
321 | ||
322 | void 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 | } | |
332 | EXPORT_SYMBOL(iwl_setup_rx_scan_handlers); | |
333 | ||
334 | static 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 | ||
343 | static 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 | ||
367 | static 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; | |
378 | ||
379 | sband = iwl_get_hw_mode(priv, band); | |
380 | if (!sband) | |
381 | return 0; | |
382 | ||
383 | channels = sband->channels; | |
384 | ||
385 | active_dwell = iwl_get_active_dwell_time(priv, band); | |
386 | passive_dwell = iwl_get_passive_dwell_time(priv, band); | |
387 | ||
388 | for (i = 0, added = 0; i < sband->n_channels; i++) { | |
389 | if (channels[i].flags & IEEE80211_CHAN_DISABLED) | |
390 | continue; | |
391 | ||
392 | scan_ch->channel = | |
393 | ieee80211_frequency_to_channel(channels[i].center_freq); | |
394 | ||
f53696de | 395 | ch_info = iwl_get_channel_info(priv, band, scan_ch->channel); |
2a421b91 | 396 | if (!is_channel_valid(ch_info)) { |
1b63ba8a | 397 | IWL_DEBUG_SCAN("Channel %d is INVALID for this band.\n", |
2a421b91 TW |
398 | scan_ch->channel); |
399 | continue; | |
400 | } | |
401 | ||
402 | if (!is_active || is_channel_passive(ch_info) || | |
403 | (channels[i].flags & IEEE80211_CHAN_PASSIVE_SCAN)) | |
f53696de | 404 | scan_ch->type = 0; |
2a421b91 | 405 | else |
f53696de | 406 | scan_ch->type = 1; |
2a421b91 TW |
407 | |
408 | if (scan_ch->type & 1) | |
409 | scan_ch->type |= (direct_mask << 1); | |
410 | ||
411 | scan_ch->active_dwell = cpu_to_le16(active_dwell); | |
412 | scan_ch->passive_dwell = cpu_to_le16(passive_dwell); | |
413 | ||
414 | /* Set txpower levels to defaults */ | |
f53696de | 415 | scan_ch->dsp_atten = 110; |
2a421b91 | 416 | |
2a421b91 | 417 | if (band == IEEE80211_BAND_5GHZ) |
f53696de | 418 | scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3; |
2a421b91 | 419 | else { |
f53696de | 420 | scan_ch->tx_gain = ((1 << 5) | (5 << 3)); |
2a421b91 TW |
421 | /* NOTE: if we were doing 6Mb OFDM for scans we'd use |
422 | * power level: | |
f53696de | 423 | * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3; |
2a421b91 TW |
424 | */ |
425 | } | |
426 | ||
427 | IWL_DEBUG_SCAN("Scanning %d [%s %d]\n", | |
428 | scan_ch->channel, | |
429 | (scan_ch->type & 1) ? "ACTIVE" : "PASSIVE", | |
430 | (scan_ch->type & 1) ? | |
431 | active_dwell : passive_dwell); | |
432 | ||
433 | scan_ch++; | |
434 | added++; | |
435 | } | |
436 | ||
437 | IWL_DEBUG_SCAN("total channels to scan %d \n", added); | |
438 | return added; | |
439 | } | |
440 | ||
f53696de TW |
441 | void iwl_init_scan_params(struct iwl_priv *priv) |
442 | { | |
443 | if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ]) | |
444 | priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = RATE_MCS_ANT_INIT_IND; | |
445 | if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ]) | |
446 | priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = RATE_MCS_ANT_INIT_IND; | |
447 | } | |
448 | ||
2a421b91 TW |
449 | int iwl_scan_initiate(struct iwl_priv *priv) |
450 | { | |
451 | if (priv->iw_mode == IEEE80211_IF_TYPE_AP) { | |
452 | IWL_ERROR("APs don't scan.\n"); | |
453 | return 0; | |
454 | } | |
455 | ||
456 | if (!iwl_is_ready_rf(priv)) { | |
457 | IWL_DEBUG_SCAN("Aborting scan due to not ready.\n"); | |
458 | return -EIO; | |
459 | } | |
460 | ||
461 | if (test_bit(STATUS_SCANNING, &priv->status)) { | |
462 | IWL_DEBUG_SCAN("Scan already in progress.\n"); | |
463 | return -EAGAIN; | |
464 | } | |
465 | ||
466 | if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) { | |
467 | IWL_DEBUG_SCAN("Scan request while abort pending. " | |
468 | "Queuing.\n"); | |
469 | return -EAGAIN; | |
470 | } | |
471 | ||
472 | IWL_DEBUG_INFO("Starting scan...\n"); | |
1b63ba8a DM |
473 | if (priv->cfg->sku & IWL_SKU_G) |
474 | priv->scan_bands |= BIT(IEEE80211_BAND_2GHZ); | |
475 | if (priv->cfg->sku & IWL_SKU_A) | |
476 | priv->scan_bands |= BIT(IEEE80211_BAND_5GHZ); | |
2a421b91 TW |
477 | set_bit(STATUS_SCANNING, &priv->status); |
478 | priv->scan_start = jiffies; | |
479 | priv->scan_pass_start = priv->scan_start; | |
480 | ||
481 | queue_work(priv->workqueue, &priv->request_scan); | |
482 | ||
483 | return 0; | |
484 | } | |
485 | EXPORT_SYMBOL(iwl_scan_initiate); | |
486 | ||
487 | #define IWL_SCAN_CHECK_WATCHDOG (7 * HZ) | |
488 | ||
489 | static void iwl_bg_scan_check(struct work_struct *data) | |
490 | { | |
491 | struct iwl_priv *priv = | |
492 | container_of(data, struct iwl_priv, scan_check.work); | |
493 | ||
494 | if (test_bit(STATUS_EXIT_PENDING, &priv->status)) | |
495 | return; | |
496 | ||
497 | mutex_lock(&priv->mutex); | |
498 | if (test_bit(STATUS_SCANNING, &priv->status) || | |
499 | test_bit(STATUS_SCAN_ABORTING, &priv->status)) { | |
500 | IWL_DEBUG(IWL_DL_SCAN, "Scan completion watchdog resetting " | |
501 | "adapter (%dms)\n", | |
502 | jiffies_to_msecs(IWL_SCAN_CHECK_WATCHDOG)); | |
503 | ||
504 | if (!test_bit(STATUS_EXIT_PENDING, &priv->status)) | |
505 | iwl_send_scan_abort(priv); | |
506 | } | |
507 | mutex_unlock(&priv->mutex); | |
508 | } | |
509 | /** | |
510 | * iwl_supported_rate_to_ie - fill in the supported rate in IE field | |
511 | * | |
512 | * return : set the bit for each supported rate insert in ie | |
513 | */ | |
514 | static u16 iwl_supported_rate_to_ie(u8 *ie, u16 supported_rate, | |
515 | u16 basic_rate, int *left) | |
516 | { | |
517 | u16 ret_rates = 0, bit; | |
518 | int i; | |
519 | u8 *cnt = ie; | |
520 | u8 *rates = ie + 1; | |
521 | ||
522 | for (bit = 1, i = 0; i < IWL_RATE_COUNT; i++, bit <<= 1) { | |
523 | if (bit & supported_rate) { | |
524 | ret_rates |= bit; | |
525 | rates[*cnt] = iwl_rates[i].ieee | | |
526 | ((bit & basic_rate) ? 0x80 : 0x00); | |
527 | (*cnt)++; | |
528 | (*left)--; | |
529 | if ((*left <= 0) || | |
530 | (*cnt >= IWL_SUPPORTED_RATES_IE_LEN)) | |
531 | break; | |
532 | } | |
533 | } | |
534 | ||
535 | return ret_rates; | |
536 | } | |
537 | ||
538 | ||
539 | static void iwl_ht_cap_to_ie(const struct ieee80211_supported_band *sband, | |
f53696de | 540 | u8 *pos, int *left) |
2a421b91 TW |
541 | { |
542 | struct ieee80211_ht_cap *ht_cap; | |
543 | ||
544 | if (!sband || !sband->ht_info.ht_supported) | |
545 | return; | |
546 | ||
547 | if (*left < sizeof(struct ieee80211_ht_cap)) | |
548 | return; | |
549 | ||
550 | *pos++ = sizeof(struct ieee80211_ht_cap); | |
551 | ht_cap = (struct ieee80211_ht_cap *) pos; | |
552 | ||
553 | ht_cap->cap_info = cpu_to_le16(sband->ht_info.cap); | |
554 | memcpy(ht_cap->supp_mcs_set, sband->ht_info.supp_mcs_set, 16); | |
555 | ht_cap->ampdu_params_info = | |
556 | (sband->ht_info.ampdu_factor & IEEE80211_HT_CAP_AMPDU_FACTOR) | | |
557 | ((sband->ht_info.ampdu_density << 2) & | |
558 | IEEE80211_HT_CAP_AMPDU_DENSITY); | |
559 | *left -= sizeof(struct ieee80211_ht_cap); | |
560 | } | |
561 | ||
562 | /** | |
563 | * iwl_fill_probe_req - fill in all required fields and IE for probe request | |
564 | */ | |
f53696de | 565 | |
2a421b91 TW |
566 | static u16 iwl_fill_probe_req(struct iwl_priv *priv, |
567 | enum ieee80211_band band, | |
568 | struct ieee80211_mgmt *frame, | |
f53696de | 569 | int left) |
2a421b91 TW |
570 | { |
571 | int len = 0; | |
572 | u8 *pos = NULL; | |
573 | u16 active_rates, ret_rates, cck_rates, active_rate_basic; | |
574 | const struct ieee80211_supported_band *sband = | |
575 | iwl_get_hw_mode(priv, band); | |
576 | ||
f53696de | 577 | |
2a421b91 TW |
578 | /* Make sure there is enough space for the probe request, |
579 | * two mandatory IEs and the data */ | |
580 | left -= 24; | |
581 | if (left < 0) | |
582 | return 0; | |
2a421b91 TW |
583 | |
584 | frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ); | |
585 | memcpy(frame->da, iwl_bcast_addr, ETH_ALEN); | |
586 | memcpy(frame->sa, priv->mac_addr, ETH_ALEN); | |
587 | memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN); | |
588 | frame->seq_ctrl = 0; | |
589 | ||
f53696de TW |
590 | len += 24; |
591 | ||
2a421b91 | 592 | /* ...next IE... */ |
f53696de | 593 | pos = &frame->u.probe_req.variable[0]; |
2a421b91 | 594 | |
f53696de | 595 | /* fill in our indirect SSID IE */ |
2a421b91 TW |
596 | left -= 2; |
597 | if (left < 0) | |
598 | return 0; | |
2a421b91 TW |
599 | *pos++ = WLAN_EID_SSID; |
600 | *pos++ = 0; | |
601 | ||
f53696de | 602 | len += 2; |
2a421b91 TW |
603 | |
604 | /* fill in supported rate */ | |
2a421b91 TW |
605 | left -= 2; |
606 | if (left < 0) | |
607 | return 0; | |
608 | ||
2a421b91 TW |
609 | *pos++ = WLAN_EID_SUPP_RATES; |
610 | *pos = 0; | |
611 | ||
612 | /* exclude 60M rate */ | |
613 | active_rates = priv->rates_mask; | |
614 | active_rates &= ~IWL_RATE_60M_MASK; | |
615 | ||
616 | active_rate_basic = active_rates & IWL_BASIC_RATES_MASK; | |
617 | ||
618 | cck_rates = IWL_CCK_RATES_MASK & active_rates; | |
619 | ret_rates = iwl_supported_rate_to_ie(pos, cck_rates, | |
f53696de | 620 | active_rate_basic, &left); |
2a421b91 TW |
621 | active_rates &= ~ret_rates; |
622 | ||
623 | ret_rates = iwl_supported_rate_to_ie(pos, active_rates, | |
f53696de | 624 | active_rate_basic, &left); |
2a421b91 TW |
625 | active_rates &= ~ret_rates; |
626 | ||
627 | len += 2 + *pos; | |
628 | pos += (*pos) + 1; | |
f53696de | 629 | |
2a421b91 TW |
630 | if (active_rates == 0) |
631 | goto fill_end; | |
632 | ||
633 | /* fill in supported extended rate */ | |
634 | /* ...next IE... */ | |
635 | left -= 2; | |
636 | if (left < 0) | |
637 | return 0; | |
638 | /* ... fill it in... */ | |
639 | *pos++ = WLAN_EID_EXT_SUPP_RATES; | |
640 | *pos = 0; | |
f53696de TW |
641 | iwl_supported_rate_to_ie(pos, active_rates, active_rate_basic, &left); |
642 | if (*pos > 0) { | |
2a421b91 | 643 | len += 2 + *pos; |
f53696de TW |
644 | pos += (*pos) + 1; |
645 | } else { | |
646 | pos--; | |
647 | } | |
2a421b91 TW |
648 | |
649 | fill_end: | |
f53696de | 650 | |
2a421b91 TW |
651 | left -= 2; |
652 | if (left < 0) | |
653 | return 0; | |
654 | ||
655 | *pos++ = WLAN_EID_HT_CAPABILITY; | |
656 | *pos = 0; | |
2a421b91 | 657 | iwl_ht_cap_to_ie(sband, pos, &left); |
2a421b91 TW |
658 | if (*pos > 0) |
659 | len += 2 + *pos; | |
f53696de | 660 | |
2a421b91 TW |
661 | return (u16)len; |
662 | } | |
663 | ||
f53696de TW |
664 | static u32 iwl_scan_tx_ant(struct iwl_priv *priv, enum ieee80211_band band) |
665 | { | |
666 | int i, ind; | |
667 | ||
668 | ind = priv->scan_tx_ant[band]; | |
669 | for (i = 0; i < priv->hw_params.tx_chains_num; i++) { | |
670 | ind = (ind+1) >= priv->hw_params.tx_chains_num ? 0 : ind+1; | |
671 | if (priv->hw_params.valid_tx_ant & (1 << ind)) { | |
672 | priv->scan_tx_ant[band] = ind; | |
673 | break; | |
674 | } | |
675 | } | |
676 | ||
677 | return scan_tx_ant[ind]; | |
678 | } | |
679 | ||
680 | ||
2a421b91 TW |
681 | static void iwl_bg_request_scan(struct work_struct *data) |
682 | { | |
683 | struct iwl_priv *priv = | |
684 | container_of(data, struct iwl_priv, request_scan); | |
685 | struct iwl_host_cmd cmd = { | |
686 | .id = REPLY_SCAN_CMD, | |
687 | .len = sizeof(struct iwl_scan_cmd), | |
688 | .meta.flags = CMD_SIZE_HUGE, | |
689 | }; | |
690 | struct iwl_scan_cmd *scan; | |
691 | struct ieee80211_conf *conf = NULL; | |
f53696de TW |
692 | int ret = 0; |
693 | u32 tx_ant; | |
2a421b91 TW |
694 | u16 cmd_len; |
695 | enum ieee80211_band band; | |
696 | u8 direct_mask; | |
f53696de | 697 | u8 rx_chain = 0x7; /* bitmap: ABC chains */ |
2a421b91 TW |
698 | |
699 | conf = ieee80211_get_hw_conf(priv->hw); | |
700 | ||
701 | mutex_lock(&priv->mutex); | |
702 | ||
703 | if (!iwl_is_ready(priv)) { | |
704 | IWL_WARNING("request scan called when driver not ready.\n"); | |
705 | goto done; | |
706 | } | |
707 | ||
708 | /* Make sure the scan wasn't cancelled before this queued work | |
709 | * was given the chance to run... */ | |
710 | if (!test_bit(STATUS_SCANNING, &priv->status)) | |
711 | goto done; | |
712 | ||
713 | /* This should never be called or scheduled if there is currently | |
714 | * a scan active in the hardware. */ | |
715 | if (test_bit(STATUS_SCAN_HW, &priv->status)) { | |
716 | IWL_DEBUG_INFO("Multiple concurrent scan requests in parallel. " | |
717 | "Ignoring second request.\n"); | |
718 | ret = -EIO; | |
719 | goto done; | |
720 | } | |
721 | ||
722 | if (test_bit(STATUS_EXIT_PENDING, &priv->status)) { | |
723 | IWL_DEBUG_SCAN("Aborting scan due to device shutdown\n"); | |
724 | goto done; | |
725 | } | |
726 | ||
727 | if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) { | |
728 | IWL_DEBUG_HC("Scan request while abort pending. Queuing.\n"); | |
729 | goto done; | |
730 | } | |
731 | ||
732 | if (iwl_is_rfkill(priv)) { | |
733 | IWL_DEBUG_HC("Aborting scan due to RF Kill activation\n"); | |
734 | goto done; | |
735 | } | |
736 | ||
737 | if (!test_bit(STATUS_READY, &priv->status)) { | |
738 | IWL_DEBUG_HC("Scan request while uninitialized. Queuing.\n"); | |
739 | goto done; | |
740 | } | |
741 | ||
742 | if (!priv->scan_bands) { | |
743 | IWL_DEBUG_HC("Aborting scan due to no requested bands\n"); | |
744 | goto done; | |
745 | } | |
746 | ||
747 | if (!priv->scan) { | |
748 | priv->scan = kmalloc(sizeof(struct iwl_scan_cmd) + | |
749 | IWL_MAX_SCAN_SIZE, GFP_KERNEL); | |
750 | if (!priv->scan) { | |
751 | ret = -ENOMEM; | |
752 | goto done; | |
753 | } | |
754 | } | |
755 | scan = priv->scan; | |
756 | memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE); | |
757 | ||
758 | scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH; | |
759 | scan->quiet_time = IWL_ACTIVE_QUIET_TIME; | |
760 | ||
761 | if (iwl_is_associated(priv)) { | |
762 | u16 interval = 0; | |
763 | u32 extra; | |
764 | u32 suspend_time = 100; | |
765 | u32 scan_suspend_time = 100; | |
766 | unsigned long flags; | |
767 | ||
768 | IWL_DEBUG_INFO("Scanning while associated...\n"); | |
769 | ||
770 | spin_lock_irqsave(&priv->lock, flags); | |
771 | interval = priv->beacon_int; | |
772 | spin_unlock_irqrestore(&priv->lock, flags); | |
773 | ||
774 | scan->suspend_time = 0; | |
775 | scan->max_out_time = cpu_to_le32(200 * 1024); | |
776 | if (!interval) | |
777 | interval = suspend_time; | |
778 | ||
779 | extra = (suspend_time / interval) << 22; | |
780 | scan_suspend_time = (extra | | |
781 | ((suspend_time % interval) * 1024)); | |
782 | scan->suspend_time = cpu_to_le32(scan_suspend_time); | |
783 | IWL_DEBUG_SCAN("suspend_time 0x%X beacon interval %d\n", | |
784 | scan_suspend_time, interval); | |
785 | } | |
786 | ||
787 | /* We should add the ability for user to lock to PASSIVE ONLY */ | |
788 | if (priv->one_direct_scan) { | |
f53696de TW |
789 | IWL_DEBUG_SCAN("Start direct scan for '%s'\n", |
790 | iwl_escape_essid(priv->direct_ssid, | |
791 | priv->direct_ssid_len)); | |
2a421b91 TW |
792 | scan->direct_scan[0].id = WLAN_EID_SSID; |
793 | scan->direct_scan[0].len = priv->direct_ssid_len; | |
794 | memcpy(scan->direct_scan[0].ssid, | |
795 | priv->direct_ssid, priv->direct_ssid_len); | |
796 | direct_mask = 1; | |
797 | } else if (!iwl_is_associated(priv) && priv->essid_len) { | |
f53696de TW |
798 | IWL_DEBUG_SCAN("Start direct scan for '%s' (not associated)\n", |
799 | iwl_escape_essid(priv->essid, priv->essid_len)); | |
2a421b91 TW |
800 | scan->direct_scan[0].id = WLAN_EID_SSID; |
801 | scan->direct_scan[0].len = priv->essid_len; | |
802 | memcpy(scan->direct_scan[0].ssid, priv->essid, priv->essid_len); | |
803 | direct_mask = 1; | |
804 | } else { | |
f53696de | 805 | IWL_DEBUG_SCAN("Start indirect scan.\n"); |
2a421b91 TW |
806 | direct_mask = 0; |
807 | } | |
808 | ||
809 | scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK; | |
810 | scan->tx_cmd.sta_id = priv->hw_params.bcast_sta_id; | |
811 | scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE; | |
812 | ||
813 | ||
1b63ba8a | 814 | if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) { |
f53696de | 815 | band = IEEE80211_BAND_2GHZ; |
2a421b91 | 816 | scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK; |
f53696de TW |
817 | tx_ant = iwl_scan_tx_ant(priv, band); |
818 | if (priv->active_rxon.flags & RXON_FLG_CHANNEL_MODE_PURE_40_MSK) | |
819 | scan->tx_cmd.rate_n_flags = | |
820 | iwl_hw_set_rate_n_flags(IWL_RATE_6M_PLCP, | |
821 | tx_ant); | |
822 | else | |
823 | scan->tx_cmd.rate_n_flags = | |
e7d326ac | 824 | iwl_hw_set_rate_n_flags(IWL_RATE_1M_PLCP, |
f53696de | 825 | tx_ant | |
e7d326ac | 826 | RATE_MCS_CCK_MSK); |
2a421b91 | 827 | scan->good_CRC_th = 0; |
1b63ba8a | 828 | } else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ)) { |
f53696de TW |
829 | band = IEEE80211_BAND_5GHZ; |
830 | tx_ant = iwl_scan_tx_ant(priv, band); | |
2a421b91 | 831 | scan->tx_cmd.rate_n_flags = |
e7d326ac | 832 | iwl_hw_set_rate_n_flags(IWL_RATE_6M_PLCP, |
f53696de | 833 | tx_ant); |
2a421b91 | 834 | scan->good_CRC_th = IWL_GOOD_CRC_TH; |
2a421b91 | 835 | |
f53696de TW |
836 | /* Force use of chains B and C (0x6) for scan Rx for 4965 |
837 | * Avoid A (0x1) because of its off-channel reception on A-band. | |
838 | * MIMO is not used here, but value is required */ | |
839 | if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965) | |
840 | rx_chain = 0x6; | |
1b63ba8a | 841 | } else { |
2a421b91 TW |
842 | IWL_WARNING("Invalid scan band count\n"); |
843 | goto done; | |
844 | } | |
845 | ||
f53696de TW |
846 | scan->rx_chain = RXON_RX_CHAIN_DRIVER_FORCE_MSK | |
847 | cpu_to_le16((0x7 << RXON_RX_CHAIN_VALID_POS) | | |
848 | (rx_chain << RXON_RX_CHAIN_FORCE_SEL_POS) | | |
849 | (0x7 << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS)); | |
850 | ||
2a421b91 | 851 | cmd_len = iwl_fill_probe_req(priv, band, |
f53696de TW |
852 | (struct ieee80211_mgmt *)scan->data, |
853 | IWL_MAX_SCAN_SIZE - sizeof(*scan)); | |
2a421b91 TW |
854 | |
855 | scan->tx_cmd.len = cpu_to_le16(cmd_len); | |
2a421b91 TW |
856 | |
857 | if (priv->iw_mode == IEEE80211_IF_TYPE_MNTR) | |
858 | scan->filter_flags = RXON_FILTER_PROMISC_MSK; | |
859 | ||
f53696de TW |
860 | scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK | |
861 | RXON_FILTER_BCON_AWARE_MSK); | |
862 | ||
2a421b91 TW |
863 | if (direct_mask) |
864 | scan->channel_count = | |
f53696de TW |
865 | iwl_get_channels_for_scan(priv, band, 1, /* active */ |
866 | direct_mask, | |
2a421b91 TW |
867 | (void *)&scan->data[le16_to_cpu(scan->tx_cmd.len)]); |
868 | else | |
869 | scan->channel_count = | |
f53696de TW |
870 | iwl_get_channels_for_scan(priv, band, 0, /* passive */ |
871 | direct_mask, | |
2a421b91 | 872 | (void *)&scan->data[le16_to_cpu(scan->tx_cmd.len)]); |
f53696de TW |
873 | if (scan->channel_count == 0) { |
874 | IWL_DEBUG_SCAN("channel count %d\n", scan->channel_count); | |
875 | goto done; | |
876 | } | |
2a421b91 | 877 | |
2a421b91 TW |
878 | cmd.len += le16_to_cpu(scan->tx_cmd.len) + |
879 | scan->channel_count * sizeof(struct iwl_scan_channel); | |
880 | cmd.data = scan; | |
881 | scan->len = cpu_to_le16(cmd.len); | |
882 | ||
883 | set_bit(STATUS_SCAN_HW, &priv->status); | |
884 | ret = iwl_send_cmd_sync(priv, &cmd); | |
885 | if (ret) | |
886 | goto done; | |
887 | ||
888 | queue_delayed_work(priv->workqueue, &priv->scan_check, | |
889 | IWL_SCAN_CHECK_WATCHDOG); | |
890 | ||
891 | mutex_unlock(&priv->mutex); | |
892 | return; | |
893 | ||
894 | done: | |
895 | /* inform mac80211 scan aborted */ | |
896 | queue_work(priv->workqueue, &priv->scan_completed); | |
897 | mutex_unlock(&priv->mutex); | |
898 | } | |
899 | ||
900 | static void iwl_bg_abort_scan(struct work_struct *work) | |
901 | { | |
902 | struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan); | |
903 | ||
904 | if (!iwl_is_ready(priv)) | |
905 | return; | |
906 | ||
907 | mutex_lock(&priv->mutex); | |
908 | ||
909 | set_bit(STATUS_SCAN_ABORTING, &priv->status); | |
910 | iwl_send_scan_abort(priv); | |
911 | ||
912 | mutex_unlock(&priv->mutex); | |
913 | } | |
914 | ||
915 | void iwl_setup_scan_deferred_work(struct iwl_priv *priv) | |
916 | { | |
917 | /* FIXME: move here when resolved PENDING | |
918 | * INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed); */ | |
919 | INIT_WORK(&priv->request_scan, iwl_bg_request_scan); | |
920 | INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan); | |
921 | INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check); | |
922 | } | |
923 | EXPORT_SYMBOL(iwl_setup_scan_deferred_work); | |
924 |