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