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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. */ | |
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 |
67 | static 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 |
73 | static 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 | ||
a33c2f47 | 91 | static const char *iwl_escape_essid(const char *essid, u8 essid_len) |
2a421b91 TW |
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 | } | |
2a421b91 TW |
114 | |
115 | /** | |
116 | * iwl_scan_cancel - Cancel any currently executing HW scan | |
117 | * | |
118 | * NOTE: priv->mutex is not required before calling this function | |
119 | */ | |
120 | int iwl_scan_cancel(struct iwl_priv *priv) | |
121 | { | |
122 | if (!test_bit(STATUS_SCAN_HW, &priv->status)) { | |
123 | clear_bit(STATUS_SCANNING, &priv->status); | |
124 | return 0; | |
125 | } | |
126 | ||
127 | if (test_bit(STATUS_SCANNING, &priv->status)) { | |
128 | if (!test_bit(STATUS_SCAN_ABORTING, &priv->status)) { | |
129 | IWL_DEBUG_SCAN("Queuing scan abort.\n"); | |
130 | set_bit(STATUS_SCAN_ABORTING, &priv->status); | |
131 | queue_work(priv->workqueue, &priv->abort_scan); | |
132 | ||
133 | } else | |
134 | IWL_DEBUG_SCAN("Scan abort already in progress.\n"); | |
135 | ||
136 | return test_bit(STATUS_SCANNING, &priv->status); | |
137 | } | |
138 | ||
139 | return 0; | |
140 | } | |
141 | EXPORT_SYMBOL(iwl_scan_cancel); | |
142 | /** | |
143 | * iwl_scan_cancel_timeout - Cancel any currently executing HW scan | |
144 | * @ms: amount of time to wait (in milliseconds) for scan to abort | |
145 | * | |
146 | * NOTE: priv->mutex must be held before calling this function | |
147 | */ | |
148 | int iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms) | |
149 | { | |
150 | unsigned long now = jiffies; | |
151 | int ret; | |
152 | ||
153 | ret = iwl_scan_cancel(priv); | |
154 | if (ret && ms) { | |
155 | mutex_unlock(&priv->mutex); | |
156 | while (!time_after(jiffies, now + msecs_to_jiffies(ms)) && | |
157 | test_bit(STATUS_SCANNING, &priv->status)) | |
158 | msleep(1); | |
159 | mutex_lock(&priv->mutex); | |
160 | ||
161 | return test_bit(STATUS_SCANNING, &priv->status); | |
162 | } | |
163 | ||
164 | return ret; | |
165 | } | |
166 | EXPORT_SYMBOL(iwl_scan_cancel_timeout); | |
167 | ||
168 | static int iwl_send_scan_abort(struct iwl_priv *priv) | |
169 | { | |
170 | int ret = 0; | |
171 | struct iwl_rx_packet *res; | |
172 | struct iwl_host_cmd cmd = { | |
173 | .id = REPLY_SCAN_ABORT_CMD, | |
174 | .meta.flags = CMD_WANT_SKB, | |
175 | }; | |
176 | ||
177 | /* If there isn't a scan actively going on in the hardware | |
178 | * then we are in between scan bands and not actually | |
179 | * actively scanning, so don't send the abort command */ | |
180 | if (!test_bit(STATUS_SCAN_HW, &priv->status)) { | |
181 | clear_bit(STATUS_SCAN_ABORTING, &priv->status); | |
182 | return 0; | |
183 | } | |
184 | ||
185 | ret = iwl_send_cmd_sync(priv, &cmd); | |
186 | if (ret) { | |
187 | clear_bit(STATUS_SCAN_ABORTING, &priv->status); | |
188 | return ret; | |
189 | } | |
190 | ||
191 | res = (struct iwl_rx_packet *)cmd.meta.u.skb->data; | |
192 | if (res->u.status != CAN_ABORT_STATUS) { | |
193 | /* The scan abort will return 1 for success or | |
194 | * 2 for "failure". A failure condition can be | |
195 | * due to simply not being in an active scan which | |
196 | * can occur if we send the scan abort before we | |
197 | * the microcode has notified us that a scan is | |
198 | * completed. */ | |
199 | IWL_DEBUG_INFO("SCAN_ABORT returned %d.\n", res->u.status); | |
200 | clear_bit(STATUS_SCAN_ABORTING, &priv->status); | |
201 | clear_bit(STATUS_SCAN_HW, &priv->status); | |
202 | } | |
203 | ||
14652562 | 204 | priv->alloc_rxb_skb--; |
2a421b91 TW |
205 | dev_kfree_skb_any(cmd.meta.u.skb); |
206 | ||
207 | return ret; | |
208 | } | |
209 | ||
210 | ||
211 | /* Service response to REPLY_SCAN_CMD (0x80) */ | |
212 | static void iwl_rx_reply_scan(struct iwl_priv *priv, | |
213 | struct iwl_rx_mem_buffer *rxb) | |
214 | { | |
215 | #ifdef CONFIG_IWLWIFI_DEBUG | |
216 | struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data; | |
217 | struct iwl_scanreq_notification *notif = | |
218 | (struct iwl_scanreq_notification *)pkt->u.raw; | |
219 | ||
220 | IWL_DEBUG_RX("Scan request status = 0x%x\n", notif->status); | |
221 | #endif | |
222 | } | |
223 | ||
224 | /* Service SCAN_START_NOTIFICATION (0x82) */ | |
225 | static void iwl_rx_scan_start_notif(struct iwl_priv *priv, | |
226 | struct iwl_rx_mem_buffer *rxb) | |
227 | { | |
228 | struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data; | |
229 | struct iwl_scanstart_notification *notif = | |
230 | (struct iwl_scanstart_notification *)pkt->u.raw; | |
231 | priv->scan_start_tsf = le32_to_cpu(notif->tsf_low); | |
232 | IWL_DEBUG_SCAN("Scan start: " | |
233 | "%d [802.11%s] " | |
234 | "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n", | |
235 | notif->channel, | |
236 | notif->band ? "bg" : "a", | |
fe905f1d TW |
237 | le32_to_cpu(notif->tsf_high), |
238 | le32_to_cpu(notif->tsf_low), | |
239 | notif->status, notif->beacon_timer); | |
2a421b91 TW |
240 | } |
241 | ||
242 | /* Service SCAN_RESULTS_NOTIFICATION (0x83) */ | |
243 | static void iwl_rx_scan_results_notif(struct iwl_priv *priv, | |
244 | struct iwl_rx_mem_buffer *rxb) | |
245 | { | |
246 | #ifdef CONFIG_IWLWIFI_DEBUG | |
247 | struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data; | |
248 | struct iwl_scanresults_notification *notif = | |
249 | (struct iwl_scanresults_notification *)pkt->u.raw; | |
250 | ||
251 | IWL_DEBUG_SCAN("Scan ch.res: " | |
252 | "%d [802.11%s] " | |
253 | "(TSF: 0x%08X:%08X) - %d " | |
254 | "elapsed=%lu usec (%dms since last)\n", | |
255 | notif->channel, | |
256 | notif->band ? "bg" : "a", | |
257 | le32_to_cpu(notif->tsf_high), | |
258 | le32_to_cpu(notif->tsf_low), | |
259 | le32_to_cpu(notif->statistics[0]), | |
260 | le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf, | |
261 | jiffies_to_msecs(elapsed_jiffies | |
262 | (priv->last_scan_jiffies, jiffies))); | |
263 | #endif | |
264 | ||
265 | priv->last_scan_jiffies = jiffies; | |
266 | priv->next_scan_jiffies = 0; | |
267 | } | |
268 | ||
269 | /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */ | |
270 | static void iwl_rx_scan_complete_notif(struct iwl_priv *priv, | |
271 | struct iwl_rx_mem_buffer *rxb) | |
272 | { | |
cb9289cb | 273 | #ifdef CONFIG_IWLWIFI_DEBUG |
2a421b91 TW |
274 | struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data; |
275 | struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw; | |
276 | ||
277 | IWL_DEBUG_SCAN("Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n", | |
278 | scan_notif->scanned_channels, | |
279 | scan_notif->tsf_low, | |
280 | scan_notif->tsf_high, scan_notif->status); | |
cb9289cb | 281 | #endif |
2a421b91 TW |
282 | |
283 | /* The HW is no longer scanning */ | |
284 | clear_bit(STATUS_SCAN_HW, &priv->status); | |
285 | ||
286 | /* The scan completion notification came in, so kill that timer... */ | |
287 | cancel_delayed_work(&priv->scan_check); | |
288 | ||
289 | IWL_DEBUG_INFO("Scan pass on %sGHz took %dms\n", | |
1b63ba8a DM |
290 | (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) ? |
291 | "2.4" : "5.2", | |
2a421b91 TW |
292 | jiffies_to_msecs(elapsed_jiffies |
293 | (priv->scan_pass_start, jiffies))); | |
294 | ||
1b63ba8a DM |
295 | /* Remove this scanned band from the list of pending |
296 | * bands to scan, band G precedes A in order of scanning | |
297 | * as seen in iwl_bg_request_scan */ | |
298 | if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) | |
299 | priv->scan_bands &= ~BIT(IEEE80211_BAND_2GHZ); | |
300 | else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ)) | |
301 | priv->scan_bands &= ~BIT(IEEE80211_BAND_5GHZ); | |
2a421b91 TW |
302 | |
303 | /* If a request to abort was given, or the scan did not succeed | |
304 | * then we reset the scan state machine and terminate, | |
305 | * re-queuing another scan if one has been requested */ | |
306 | if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) { | |
307 | IWL_DEBUG_INFO("Aborted scan completed.\n"); | |
308 | clear_bit(STATUS_SCAN_ABORTING, &priv->status); | |
309 | } else { | |
310 | /* If there are more bands on this scan pass reschedule */ | |
1b63ba8a | 311 | if (priv->scan_bands) |
2a421b91 TW |
312 | goto reschedule; |
313 | } | |
314 | ||
315 | priv->last_scan_jiffies = jiffies; | |
316 | priv->next_scan_jiffies = 0; | |
317 | IWL_DEBUG_INFO("Setting scan to off\n"); | |
318 | ||
319 | clear_bit(STATUS_SCANNING, &priv->status); | |
320 | ||
321 | IWL_DEBUG_INFO("Scan took %dms\n", | |
322 | jiffies_to_msecs(elapsed_jiffies(priv->scan_start, jiffies))); | |
323 | ||
324 | queue_work(priv->workqueue, &priv->scan_completed); | |
325 | ||
326 | return; | |
327 | ||
328 | reschedule: | |
329 | priv->scan_pass_start = jiffies; | |
330 | queue_work(priv->workqueue, &priv->request_scan); | |
331 | } | |
332 | ||
333 | void iwl_setup_rx_scan_handlers(struct iwl_priv *priv) | |
334 | { | |
335 | /* scan handlers */ | |
336 | priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan; | |
337 | priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif; | |
338 | priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] = | |
339 | iwl_rx_scan_results_notif; | |
340 | priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] = | |
341 | iwl_rx_scan_complete_notif; | |
342 | } | |
343 | EXPORT_SYMBOL(iwl_setup_rx_scan_handlers); | |
344 | ||
345 | static inline u16 iwl_get_active_dwell_time(struct iwl_priv *priv, | |
fe905f1d TW |
346 | enum ieee80211_band band, |
347 | u8 n_probes) | |
2a421b91 TW |
348 | { |
349 | if (band == IEEE80211_BAND_5GHZ) | |
fe905f1d TW |
350 | return IWL_ACTIVE_DWELL_TIME_52 + |
351 | IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1); | |
2a421b91 | 352 | else |
fe905f1d TW |
353 | return IWL_ACTIVE_DWELL_TIME_24 + |
354 | IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1); | |
2a421b91 TW |
355 | } |
356 | ||
357 | static u16 iwl_get_passive_dwell_time(struct iwl_priv *priv, | |
fe905f1d | 358 | enum ieee80211_band band) |
2a421b91 | 359 | { |
fe905f1d | 360 | u16 passive = (band == IEEE80211_BAND_2GHZ) ? |
2a421b91 TW |
361 | IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 : |
362 | IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52; | |
363 | ||
364 | if (iwl_is_associated(priv)) { | |
365 | /* If we're associated, we clamp the maximum passive | |
366 | * dwell time to be 98% of the beacon interval (minus | |
367 | * 2 * channel tune time) */ | |
368 | passive = priv->beacon_int; | |
369 | if ((passive > IWL_PASSIVE_DWELL_BASE) || !passive) | |
370 | passive = IWL_PASSIVE_DWELL_BASE; | |
371 | passive = (passive * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2; | |
372 | } | |
373 | ||
2a421b91 TW |
374 | return passive; |
375 | } | |
376 | ||
377 | static int iwl_get_channels_for_scan(struct iwl_priv *priv, | |
378 | enum ieee80211_band band, | |
fe905f1d | 379 | u8 is_active, u8 n_probes, |
2a421b91 TW |
380 | struct iwl_scan_channel *scan_ch) |
381 | { | |
382 | const struct ieee80211_channel *channels = NULL; | |
383 | const struct ieee80211_supported_band *sband; | |
384 | const struct iwl_channel_info *ch_info; | |
385 | u16 passive_dwell = 0; | |
386 | u16 active_dwell = 0; | |
387 | int added, i; | |
d16dc48a | 388 | u16 channel; |
2a421b91 TW |
389 | |
390 | sband = iwl_get_hw_mode(priv, band); | |
391 | if (!sband) | |
392 | return 0; | |
393 | ||
394 | channels = sband->channels; | |
395 | ||
fe905f1d | 396 | active_dwell = iwl_get_active_dwell_time(priv, band, n_probes); |
2a421b91 TW |
397 | passive_dwell = iwl_get_passive_dwell_time(priv, band); |
398 | ||
fe905f1d TW |
399 | if (passive_dwell <= active_dwell) |
400 | passive_dwell = active_dwell + 1; | |
401 | ||
2a421b91 TW |
402 | for (i = 0, added = 0; i < sband->n_channels; i++) { |
403 | if (channels[i].flags & IEEE80211_CHAN_DISABLED) | |
404 | continue; | |
405 | ||
d16dc48a | 406 | channel = |
2a421b91 | 407 | ieee80211_frequency_to_channel(channels[i].center_freq); |
d16dc48a | 408 | scan_ch->channel = cpu_to_le16(channel); |
2a421b91 | 409 | |
d16dc48a | 410 | ch_info = iwl_get_channel_info(priv, band, channel); |
2a421b91 | 411 | if (!is_channel_valid(ch_info)) { |
1b63ba8a | 412 | IWL_DEBUG_SCAN("Channel %d is INVALID for this band.\n", |
d16dc48a | 413 | channel); |
2a421b91 TW |
414 | continue; |
415 | } | |
416 | ||
417 | if (!is_active || is_channel_passive(ch_info) || | |
418 | (channels[i].flags & IEEE80211_CHAN_PASSIVE_SCAN)) | |
d16dc48a | 419 | scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE; |
2a421b91 | 420 | else |
d16dc48a | 421 | scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE; |
2a421b91 | 422 | |
0ffe014a | 423 | if (n_probes) |
fe905f1d | 424 | scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes); |
2a421b91 TW |
425 | |
426 | scan_ch->active_dwell = cpu_to_le16(active_dwell); | |
427 | scan_ch->passive_dwell = cpu_to_le16(passive_dwell); | |
428 | ||
429 | /* Set txpower levels to defaults */ | |
f53696de | 430 | scan_ch->dsp_atten = 110; |
2a421b91 | 431 | |
fe905f1d TW |
432 | /* NOTE: if we were doing 6Mb OFDM for scans we'd use |
433 | * power level: | |
434 | * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3; | |
435 | */ | |
2a421b91 | 436 | if (band == IEEE80211_BAND_5GHZ) |
f53696de | 437 | scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3; |
fe905f1d | 438 | else |
f53696de | 439 | scan_ch->tx_gain = ((1 << 5) | (5 << 3)); |
2a421b91 | 440 | |
fe905f1d TW |
441 | IWL_DEBUG_SCAN("Scanning ch=%d prob=0x%X [%s %d]\n", |
442 | channel, le32_to_cpu(scan_ch->type), | |
d16dc48a TW |
443 | (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ? |
444 | "ACTIVE" : "PASSIVE", | |
445 | (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ? | |
2a421b91 TW |
446 | active_dwell : passive_dwell); |
447 | ||
448 | scan_ch++; | |
449 | added++; | |
450 | } | |
451 | ||
452 | IWL_DEBUG_SCAN("total channels to scan %d \n", added); | |
453 | return added; | |
454 | } | |
455 | ||
f53696de TW |
456 | void iwl_init_scan_params(struct iwl_priv *priv) |
457 | { | |
458 | if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ]) | |
459 | priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = RATE_MCS_ANT_INIT_IND; | |
460 | if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ]) | |
461 | priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = RATE_MCS_ANT_INIT_IND; | |
462 | } | |
463 | ||
2a421b91 TW |
464 | int iwl_scan_initiate(struct iwl_priv *priv) |
465 | { | |
2a421b91 TW |
466 | if (!iwl_is_ready_rf(priv)) { |
467 | IWL_DEBUG_SCAN("Aborting scan due to not ready.\n"); | |
468 | return -EIO; | |
469 | } | |
470 | ||
471 | if (test_bit(STATUS_SCANNING, &priv->status)) { | |
472 | IWL_DEBUG_SCAN("Scan already in progress.\n"); | |
473 | return -EAGAIN; | |
474 | } | |
475 | ||
476 | if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) { | |
8d09a5e1 | 477 | IWL_DEBUG_SCAN("Scan request while abort pending\n"); |
2a421b91 TW |
478 | return -EAGAIN; |
479 | } | |
480 | ||
481 | IWL_DEBUG_INFO("Starting scan...\n"); | |
1b63ba8a DM |
482 | if (priv->cfg->sku & IWL_SKU_G) |
483 | priv->scan_bands |= BIT(IEEE80211_BAND_2GHZ); | |
484 | if (priv->cfg->sku & IWL_SKU_A) | |
485 | priv->scan_bands |= BIT(IEEE80211_BAND_5GHZ); | |
2a421b91 TW |
486 | set_bit(STATUS_SCANNING, &priv->status); |
487 | priv->scan_start = jiffies; | |
488 | priv->scan_pass_start = priv->scan_start; | |
489 | ||
490 | queue_work(priv->workqueue, &priv->request_scan); | |
491 | ||
492 | return 0; | |
493 | } | |
494 | EXPORT_SYMBOL(iwl_scan_initiate); | |
495 | ||
496 | #define IWL_SCAN_CHECK_WATCHDOG (7 * HZ) | |
497 | ||
498 | static void iwl_bg_scan_check(struct work_struct *data) | |
499 | { | |
500 | struct iwl_priv *priv = | |
501 | container_of(data, struct iwl_priv, scan_check.work); | |
502 | ||
503 | if (test_bit(STATUS_EXIT_PENDING, &priv->status)) | |
504 | return; | |
505 | ||
506 | mutex_lock(&priv->mutex); | |
507 | if (test_bit(STATUS_SCANNING, &priv->status) || | |
508 | test_bit(STATUS_SCAN_ABORTING, &priv->status)) { | |
509 | IWL_DEBUG(IWL_DL_SCAN, "Scan completion watchdog resetting " | |
510 | "adapter (%dms)\n", | |
511 | jiffies_to_msecs(IWL_SCAN_CHECK_WATCHDOG)); | |
512 | ||
513 | if (!test_bit(STATUS_EXIT_PENDING, &priv->status)) | |
514 | iwl_send_scan_abort(priv); | |
515 | } | |
516 | mutex_unlock(&priv->mutex); | |
517 | } | |
518 | /** | |
519 | * iwl_supported_rate_to_ie - fill in the supported rate in IE field | |
520 | * | |
521 | * return : set the bit for each supported rate insert in ie | |
522 | */ | |
523 | static u16 iwl_supported_rate_to_ie(u8 *ie, u16 supported_rate, | |
524 | u16 basic_rate, int *left) | |
525 | { | |
526 | u16 ret_rates = 0, bit; | |
527 | int i; | |
528 | u8 *cnt = ie; | |
529 | u8 *rates = ie + 1; | |
530 | ||
531 | for (bit = 1, i = 0; i < IWL_RATE_COUNT; i++, bit <<= 1) { | |
532 | if (bit & supported_rate) { | |
533 | ret_rates |= bit; | |
534 | rates[*cnt] = iwl_rates[i].ieee | | |
535 | ((bit & basic_rate) ? 0x80 : 0x00); | |
536 | (*cnt)++; | |
537 | (*left)--; | |
538 | if ((*left <= 0) || | |
539 | (*cnt >= IWL_SUPPORTED_RATES_IE_LEN)) | |
540 | break; | |
541 | } | |
542 | } | |
543 | ||
544 | return ret_rates; | |
545 | } | |
546 | ||
547 | ||
548 | static void iwl_ht_cap_to_ie(const struct ieee80211_supported_band *sband, | |
f53696de | 549 | u8 *pos, int *left) |
2a421b91 TW |
550 | { |
551 | struct ieee80211_ht_cap *ht_cap; | |
552 | ||
553 | if (!sband || !sband->ht_info.ht_supported) | |
554 | return; | |
555 | ||
556 | if (*left < sizeof(struct ieee80211_ht_cap)) | |
557 | return; | |
558 | ||
559 | *pos++ = sizeof(struct ieee80211_ht_cap); | |
560 | ht_cap = (struct ieee80211_ht_cap *) pos; | |
561 | ||
562 | ht_cap->cap_info = cpu_to_le16(sband->ht_info.cap); | |
563 | memcpy(ht_cap->supp_mcs_set, sband->ht_info.supp_mcs_set, 16); | |
564 | ht_cap->ampdu_params_info = | |
565 | (sband->ht_info.ampdu_factor & IEEE80211_HT_CAP_AMPDU_FACTOR) | | |
566 | ((sband->ht_info.ampdu_density << 2) & | |
567 | IEEE80211_HT_CAP_AMPDU_DENSITY); | |
568 | *left -= sizeof(struct ieee80211_ht_cap); | |
569 | } | |
570 | ||
571 | /** | |
572 | * iwl_fill_probe_req - fill in all required fields and IE for probe request | |
573 | */ | |
f53696de | 574 | |
2a421b91 TW |
575 | static u16 iwl_fill_probe_req(struct iwl_priv *priv, |
576 | enum ieee80211_band band, | |
577 | struct ieee80211_mgmt *frame, | |
f53696de | 578 | int left) |
2a421b91 TW |
579 | { |
580 | int len = 0; | |
581 | u8 *pos = NULL; | |
582 | u16 active_rates, ret_rates, cck_rates, active_rate_basic; | |
583 | const struct ieee80211_supported_band *sband = | |
584 | iwl_get_hw_mode(priv, band); | |
585 | ||
f53696de | 586 | |
2a421b91 TW |
587 | /* Make sure there is enough space for the probe request, |
588 | * two mandatory IEs and the data */ | |
589 | left -= 24; | |
590 | if (left < 0) | |
591 | return 0; | |
2a421b91 TW |
592 | |
593 | frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ); | |
594 | memcpy(frame->da, iwl_bcast_addr, ETH_ALEN); | |
595 | memcpy(frame->sa, priv->mac_addr, ETH_ALEN); | |
596 | memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN); | |
597 | frame->seq_ctrl = 0; | |
598 | ||
f53696de TW |
599 | len += 24; |
600 | ||
2a421b91 | 601 | /* ...next IE... */ |
f53696de | 602 | pos = &frame->u.probe_req.variable[0]; |
2a421b91 | 603 | |
f53696de | 604 | /* fill in our indirect SSID IE */ |
2a421b91 TW |
605 | left -= 2; |
606 | if (left < 0) | |
607 | return 0; | |
2a421b91 TW |
608 | *pos++ = WLAN_EID_SSID; |
609 | *pos++ = 0; | |
610 | ||
f53696de | 611 | len += 2; |
2a421b91 TW |
612 | |
613 | /* fill in supported rate */ | |
2a421b91 TW |
614 | left -= 2; |
615 | if (left < 0) | |
616 | return 0; | |
617 | ||
2a421b91 TW |
618 | *pos++ = WLAN_EID_SUPP_RATES; |
619 | *pos = 0; | |
620 | ||
621 | /* exclude 60M rate */ | |
622 | active_rates = priv->rates_mask; | |
623 | active_rates &= ~IWL_RATE_60M_MASK; | |
624 | ||
625 | active_rate_basic = active_rates & IWL_BASIC_RATES_MASK; | |
626 | ||
627 | cck_rates = IWL_CCK_RATES_MASK & active_rates; | |
628 | ret_rates = iwl_supported_rate_to_ie(pos, cck_rates, | |
f53696de | 629 | active_rate_basic, &left); |
2a421b91 TW |
630 | active_rates &= ~ret_rates; |
631 | ||
632 | ret_rates = iwl_supported_rate_to_ie(pos, active_rates, | |
f53696de | 633 | active_rate_basic, &left); |
2a421b91 TW |
634 | active_rates &= ~ret_rates; |
635 | ||
636 | len += 2 + *pos; | |
637 | pos += (*pos) + 1; | |
f53696de | 638 | |
2a421b91 TW |
639 | if (active_rates == 0) |
640 | goto fill_end; | |
641 | ||
642 | /* fill in supported extended rate */ | |
643 | /* ...next IE... */ | |
644 | left -= 2; | |
645 | if (left < 0) | |
646 | return 0; | |
647 | /* ... fill it in... */ | |
648 | *pos++ = WLAN_EID_EXT_SUPP_RATES; | |
649 | *pos = 0; | |
f53696de TW |
650 | iwl_supported_rate_to_ie(pos, active_rates, active_rate_basic, &left); |
651 | if (*pos > 0) { | |
2a421b91 | 652 | len += 2 + *pos; |
f53696de TW |
653 | pos += (*pos) + 1; |
654 | } else { | |
655 | pos--; | |
656 | } | |
2a421b91 TW |
657 | |
658 | fill_end: | |
f53696de | 659 | |
2a421b91 TW |
660 | left -= 2; |
661 | if (left < 0) | |
662 | return 0; | |
663 | ||
664 | *pos++ = WLAN_EID_HT_CAPABILITY; | |
665 | *pos = 0; | |
2a421b91 | 666 | iwl_ht_cap_to_ie(sband, pos, &left); |
2a421b91 TW |
667 | if (*pos > 0) |
668 | len += 2 + *pos; | |
f53696de | 669 | |
2a421b91 TW |
670 | return (u16)len; |
671 | } | |
672 | ||
f53696de TW |
673 | static u32 iwl_scan_tx_ant(struct iwl_priv *priv, enum ieee80211_band band) |
674 | { | |
675 | int i, ind; | |
676 | ||
677 | ind = priv->scan_tx_ant[band]; | |
678 | for (i = 0; i < priv->hw_params.tx_chains_num; i++) { | |
679 | ind = (ind+1) >= priv->hw_params.tx_chains_num ? 0 : ind+1; | |
680 | if (priv->hw_params.valid_tx_ant & (1 << ind)) { | |
681 | priv->scan_tx_ant[band] = ind; | |
682 | break; | |
683 | } | |
684 | } | |
fe905f1d | 685 | IWL_DEBUG_SCAN("select TX ANT = %c\n", 'A' + ind); |
f53696de TW |
686 | return scan_tx_ant[ind]; |
687 | } | |
688 | ||
689 | ||
2a421b91 TW |
690 | static void iwl_bg_request_scan(struct work_struct *data) |
691 | { | |
692 | struct iwl_priv *priv = | |
693 | container_of(data, struct iwl_priv, request_scan); | |
694 | struct iwl_host_cmd cmd = { | |
695 | .id = REPLY_SCAN_CMD, | |
696 | .len = sizeof(struct iwl_scan_cmd), | |
697 | .meta.flags = CMD_SIZE_HUGE, | |
698 | }; | |
699 | struct iwl_scan_cmd *scan; | |
700 | struct ieee80211_conf *conf = NULL; | |
f53696de TW |
701 | int ret = 0; |
702 | u32 tx_ant; | |
2a421b91 TW |
703 | u16 cmd_len; |
704 | enum ieee80211_band band; | |
fe905f1d | 705 | u8 n_probes = 2; |
d588be6b | 706 | u8 rx_chain = priv->hw_params.valid_rx_ant; |
2a421b91 TW |
707 | |
708 | conf = ieee80211_get_hw_conf(priv->hw); | |
709 | ||
710 | mutex_lock(&priv->mutex); | |
711 | ||
712 | if (!iwl_is_ready(priv)) { | |
713 | IWL_WARNING("request scan called when driver not ready.\n"); | |
714 | goto done; | |
715 | } | |
716 | ||
717 | /* Make sure the scan wasn't cancelled before this queued work | |
718 | * was given the chance to run... */ | |
719 | if (!test_bit(STATUS_SCANNING, &priv->status)) | |
720 | goto done; | |
721 | ||
722 | /* This should never be called or scheduled if there is currently | |
723 | * a scan active in the hardware. */ | |
724 | if (test_bit(STATUS_SCAN_HW, &priv->status)) { | |
725 | IWL_DEBUG_INFO("Multiple concurrent scan requests in parallel. " | |
726 | "Ignoring second request.\n"); | |
727 | ret = -EIO; | |
728 | goto done; | |
729 | } | |
730 | ||
731 | if (test_bit(STATUS_EXIT_PENDING, &priv->status)) { | |
732 | IWL_DEBUG_SCAN("Aborting scan due to device shutdown\n"); | |
733 | goto done; | |
734 | } | |
735 | ||
736 | if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) { | |
737 | IWL_DEBUG_HC("Scan request while abort pending. Queuing.\n"); | |
738 | goto done; | |
739 | } | |
740 | ||
741 | if (iwl_is_rfkill(priv)) { | |
742 | IWL_DEBUG_HC("Aborting scan due to RF Kill activation\n"); | |
743 | goto done; | |
744 | } | |
745 | ||
746 | if (!test_bit(STATUS_READY, &priv->status)) { | |
747 | IWL_DEBUG_HC("Scan request while uninitialized. Queuing.\n"); | |
748 | goto done; | |
749 | } | |
750 | ||
751 | if (!priv->scan_bands) { | |
752 | IWL_DEBUG_HC("Aborting scan due to no requested bands\n"); | |
753 | goto done; | |
754 | } | |
755 | ||
756 | if (!priv->scan) { | |
757 | priv->scan = kmalloc(sizeof(struct iwl_scan_cmd) + | |
758 | IWL_MAX_SCAN_SIZE, GFP_KERNEL); | |
759 | if (!priv->scan) { | |
760 | ret = -ENOMEM; | |
761 | goto done; | |
762 | } | |
763 | } | |
764 | scan = priv->scan; | |
765 | memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE); | |
766 | ||
767 | scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH; | |
768 | scan->quiet_time = IWL_ACTIVE_QUIET_TIME; | |
769 | ||
770 | if (iwl_is_associated(priv)) { | |
771 | u16 interval = 0; | |
772 | u32 extra; | |
773 | u32 suspend_time = 100; | |
774 | u32 scan_suspend_time = 100; | |
775 | unsigned long flags; | |
776 | ||
777 | IWL_DEBUG_INFO("Scanning while associated...\n"); | |
778 | ||
779 | spin_lock_irqsave(&priv->lock, flags); | |
780 | interval = priv->beacon_int; | |
781 | spin_unlock_irqrestore(&priv->lock, flags); | |
782 | ||
783 | scan->suspend_time = 0; | |
784 | scan->max_out_time = cpu_to_le32(200 * 1024); | |
785 | if (!interval) | |
786 | interval = suspend_time; | |
787 | ||
788 | extra = (suspend_time / interval) << 22; | |
789 | scan_suspend_time = (extra | | |
790 | ((suspend_time % interval) * 1024)); | |
791 | scan->suspend_time = cpu_to_le32(scan_suspend_time); | |
792 | IWL_DEBUG_SCAN("suspend_time 0x%X beacon interval %d\n", | |
793 | scan_suspend_time, interval); | |
794 | } | |
795 | ||
796 | /* We should add the ability for user to lock to PASSIVE ONLY */ | |
797 | if (priv->one_direct_scan) { | |
f53696de TW |
798 | IWL_DEBUG_SCAN("Start direct scan for '%s'\n", |
799 | iwl_escape_essid(priv->direct_ssid, | |
800 | priv->direct_ssid_len)); | |
2a421b91 TW |
801 | scan->direct_scan[0].id = WLAN_EID_SSID; |
802 | scan->direct_scan[0].len = priv->direct_ssid_len; | |
803 | memcpy(scan->direct_scan[0].ssid, | |
804 | priv->direct_ssid, priv->direct_ssid_len); | |
fe905f1d | 805 | n_probes++; |
2a421b91 | 806 | } else if (!iwl_is_associated(priv) && priv->essid_len) { |
f53696de TW |
807 | IWL_DEBUG_SCAN("Start direct scan for '%s' (not associated)\n", |
808 | iwl_escape_essid(priv->essid, priv->essid_len)); | |
2a421b91 TW |
809 | scan->direct_scan[0].id = WLAN_EID_SSID; |
810 | scan->direct_scan[0].len = priv->essid_len; | |
811 | memcpy(scan->direct_scan[0].ssid, priv->essid, priv->essid_len); | |
fe905f1d | 812 | n_probes++; |
2a421b91 | 813 | } else { |
f53696de | 814 | IWL_DEBUG_SCAN("Start indirect scan.\n"); |
2a421b91 TW |
815 | } |
816 | ||
817 | scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK; | |
818 | scan->tx_cmd.sta_id = priv->hw_params.bcast_sta_id; | |
819 | scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE; | |
820 | ||
821 | ||
1b63ba8a | 822 | if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) { |
f53696de | 823 | band = IEEE80211_BAND_2GHZ; |
2a421b91 | 824 | scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK; |
f53696de TW |
825 | tx_ant = iwl_scan_tx_ant(priv, band); |
826 | if (priv->active_rxon.flags & RXON_FLG_CHANNEL_MODE_PURE_40_MSK) | |
827 | scan->tx_cmd.rate_n_flags = | |
828 | iwl_hw_set_rate_n_flags(IWL_RATE_6M_PLCP, | |
829 | tx_ant); | |
830 | else | |
831 | scan->tx_cmd.rate_n_flags = | |
e7d326ac | 832 | iwl_hw_set_rate_n_flags(IWL_RATE_1M_PLCP, |
f53696de | 833 | tx_ant | |
e7d326ac | 834 | RATE_MCS_CCK_MSK); |
2a421b91 | 835 | scan->good_CRC_th = 0; |
1b63ba8a | 836 | } else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ)) { |
f53696de TW |
837 | band = IEEE80211_BAND_5GHZ; |
838 | tx_ant = iwl_scan_tx_ant(priv, band); | |
2a421b91 | 839 | scan->tx_cmd.rate_n_flags = |
e7d326ac | 840 | iwl_hw_set_rate_n_flags(IWL_RATE_6M_PLCP, |
f53696de | 841 | tx_ant); |
2a421b91 | 842 | scan->good_CRC_th = IWL_GOOD_CRC_TH; |
2a421b91 | 843 | |
f53696de TW |
844 | /* Force use of chains B and C (0x6) for scan Rx for 4965 |
845 | * Avoid A (0x1) because of its off-channel reception on A-band. | |
846 | * MIMO is not used here, but value is required */ | |
847 | if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965) | |
848 | rx_chain = 0x6; | |
1b63ba8a | 849 | } else { |
2a421b91 TW |
850 | IWL_WARNING("Invalid scan band count\n"); |
851 | goto done; | |
852 | } | |
853 | ||
f53696de TW |
854 | scan->rx_chain = RXON_RX_CHAIN_DRIVER_FORCE_MSK | |
855 | cpu_to_le16((0x7 << RXON_RX_CHAIN_VALID_POS) | | |
856 | (rx_chain << RXON_RX_CHAIN_FORCE_SEL_POS) | | |
857 | (0x7 << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS)); | |
858 | ||
2a421b91 | 859 | cmd_len = iwl_fill_probe_req(priv, band, |
f53696de TW |
860 | (struct ieee80211_mgmt *)scan->data, |
861 | IWL_MAX_SCAN_SIZE - sizeof(*scan)); | |
2a421b91 TW |
862 | |
863 | scan->tx_cmd.len = cpu_to_le16(cmd_len); | |
2a421b91 | 864 | |
05c914fe | 865 | if (priv->iw_mode == NL80211_IFTYPE_MONITOR) |
2a421b91 TW |
866 | scan->filter_flags = RXON_FILTER_PROMISC_MSK; |
867 | ||
f53696de TW |
868 | scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK | |
869 | RXON_FILTER_BCON_AWARE_MSK); | |
870 | ||
fe905f1d TW |
871 | scan->channel_count = |
872 | iwl_get_channels_for_scan(priv, band, 1, /* active */ | |
873 | n_probes, | |
874 | (void *)&scan->data[le16_to_cpu(scan->tx_cmd.len)]); | |
875 | ||
f53696de TW |
876 | if (scan->channel_count == 0) { |
877 | IWL_DEBUG_SCAN("channel count %d\n", scan->channel_count); | |
878 | goto done; | |
879 | } | |
2a421b91 | 880 | |
2a421b91 TW |
881 | cmd.len += le16_to_cpu(scan->tx_cmd.len) + |
882 | scan->channel_count * sizeof(struct iwl_scan_channel); | |
883 | cmd.data = scan; | |
884 | scan->len = cpu_to_le16(cmd.len); | |
885 | ||
886 | set_bit(STATUS_SCAN_HW, &priv->status); | |
887 | ret = iwl_send_cmd_sync(priv, &cmd); | |
888 | if (ret) | |
889 | goto done; | |
890 | ||
891 | queue_delayed_work(priv->workqueue, &priv->scan_check, | |
892 | IWL_SCAN_CHECK_WATCHDOG); | |
893 | ||
894 | mutex_unlock(&priv->mutex); | |
895 | return; | |
896 | ||
897 | done: | |
898 | /* inform mac80211 scan aborted */ | |
899 | queue_work(priv->workqueue, &priv->scan_completed); | |
900 | mutex_unlock(&priv->mutex); | |
901 | } | |
902 | ||
903 | static void iwl_bg_abort_scan(struct work_struct *work) | |
904 | { | |
905 | struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan); | |
906 | ||
907 | if (!iwl_is_ready(priv)) | |
908 | return; | |
909 | ||
910 | mutex_lock(&priv->mutex); | |
911 | ||
912 | set_bit(STATUS_SCAN_ABORTING, &priv->status); | |
913 | iwl_send_scan_abort(priv); | |
914 | ||
915 | mutex_unlock(&priv->mutex); | |
916 | } | |
917 | ||
918 | void iwl_setup_scan_deferred_work(struct iwl_priv *priv) | |
919 | { | |
920 | /* FIXME: move here when resolved PENDING | |
921 | * INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed); */ | |
922 | INIT_WORK(&priv->request_scan, iwl_bg_request_scan); | |
923 | INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan); | |
924 | INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check); | |
925 | } | |
926 | EXPORT_SYMBOL(iwl_setup_scan_deferred_work); | |
927 |