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iwlwifi: mvm: reorganize scan stopping functions
[deliverable/linux.git] / drivers / net / wireless / iwlwifi / mvm / scan.c
1 /******************************************************************************
2 *
3 * This file is provided under a dual BSD/GPLv2 license. When using or
4 * redistributing this file, you may do so under either license.
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6 * GPL LICENSE SUMMARY
7 *
8 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
9 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
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34 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
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64 *****************************************************************************/
65
66 #include <linux/etherdevice.h>
67 #include <net/mac80211.h>
68
69 #include "mvm.h"
70 #include "fw-api-scan.h"
71
72 #define IWL_DENSE_EBS_SCAN_RATIO 5
73 #define IWL_SPARSE_EBS_SCAN_RATIO 1
74
75 struct iwl_mvm_scan_params {
76 u32 max_out_time;
77 u32 suspend_time;
78 bool passive_fragmented;
79 u32 n_channels;
80 u16 delay;
81 int n_ssids;
82 struct cfg80211_ssid *ssids;
83 struct ieee80211_channel **channels;
84 u16 interval; /* interval between scans (in secs) */
85 u32 flags;
86 u8 *mac_addr;
87 u8 *mac_addr_mask;
88 bool no_cck;
89 bool pass_all;
90 int n_match_sets;
91 struct iwl_scan_probe_req preq;
92 struct cfg80211_match_set *match_sets;
93 struct _dwell {
94 u16 passive;
95 u16 active;
96 u16 fragmented;
97 } dwell[IEEE80211_NUM_BANDS];
98 struct {
99 u8 iterations;
100 u8 full_scan_mul; /* not used for UMAC */
101 } schedule[2];
102 };
103
104 static int iwl_umac_scan_stop(struct iwl_mvm *mvm, int type, bool notify);
105
106 static u8 iwl_mvm_scan_rx_ant(struct iwl_mvm *mvm)
107 {
108 if (mvm->scan_rx_ant != ANT_NONE)
109 return mvm->scan_rx_ant;
110 return iwl_mvm_get_valid_rx_ant(mvm);
111 }
112
113 static inline __le16 iwl_mvm_scan_rx_chain(struct iwl_mvm *mvm)
114 {
115 u16 rx_chain;
116 u8 rx_ant;
117
118 rx_ant = iwl_mvm_scan_rx_ant(mvm);
119 rx_chain = rx_ant << PHY_RX_CHAIN_VALID_POS;
120 rx_chain |= rx_ant << PHY_RX_CHAIN_FORCE_MIMO_SEL_POS;
121 rx_chain |= rx_ant << PHY_RX_CHAIN_FORCE_SEL_POS;
122 rx_chain |= 0x1 << PHY_RX_CHAIN_DRIVER_FORCE_POS;
123 return cpu_to_le16(rx_chain);
124 }
125
126 static __le32 iwl_mvm_scan_rxon_flags(enum ieee80211_band band)
127 {
128 if (band == IEEE80211_BAND_2GHZ)
129 return cpu_to_le32(PHY_BAND_24);
130 else
131 return cpu_to_le32(PHY_BAND_5);
132 }
133
134 static inline __le32
135 iwl_mvm_scan_rate_n_flags(struct iwl_mvm *mvm, enum ieee80211_band band,
136 bool no_cck)
137 {
138 u32 tx_ant;
139
140 mvm->scan_last_antenna_idx =
141 iwl_mvm_next_antenna(mvm, iwl_mvm_get_valid_tx_ant(mvm),
142 mvm->scan_last_antenna_idx);
143 tx_ant = BIT(mvm->scan_last_antenna_idx) << RATE_MCS_ANT_POS;
144
145 if (band == IEEE80211_BAND_2GHZ && !no_cck)
146 return cpu_to_le32(IWL_RATE_1M_PLCP | RATE_MCS_CCK_MSK |
147 tx_ant);
148 else
149 return cpu_to_le32(IWL_RATE_6M_PLCP | tx_ant);
150 }
151
152 /*
153 * If req->n_ssids > 0, it means we should do an active scan.
154 * In case of active scan w/o directed scan, we receive a zero-length SSID
155 * just to notify that this scan is active and not passive.
156 * In order to notify the FW of the number of SSIDs we wish to scan (including
157 * the zero-length one), we need to set the corresponding bits in chan->type,
158 * one for each SSID, and set the active bit (first). If the first SSID is
159 * already included in the probe template, so we need to set only
160 * req->n_ssids - 1 bits in addition to the first bit.
161 */
162 static u16 iwl_mvm_get_active_dwell(struct iwl_mvm *mvm,
163 enum ieee80211_band band, int n_ssids)
164 {
165 if (mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_BASIC_DWELL)
166 return 10;
167 if (band == IEEE80211_BAND_2GHZ)
168 return 20 + 3 * (n_ssids + 1);
169 return 10 + 2 * (n_ssids + 1);
170 }
171
172 static u16 iwl_mvm_get_passive_dwell(struct iwl_mvm *mvm,
173 enum ieee80211_band band)
174 {
175 if (mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_BASIC_DWELL)
176 return 110;
177 return band == IEEE80211_BAND_2GHZ ? 100 + 20 : 100 + 10;
178 }
179
180 static void iwl_mvm_scan_condition_iterator(void *data, u8 *mac,
181 struct ieee80211_vif *vif)
182 {
183 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
184 int *global_cnt = data;
185
186 if (vif->type != NL80211_IFTYPE_P2P_DEVICE && mvmvif->phy_ctxt &&
187 mvmvif->phy_ctxt->id < MAX_PHYS)
188 *global_cnt += 1;
189 }
190
191 static void iwl_mvm_scan_calc_dwell(struct iwl_mvm *mvm,
192 struct ieee80211_vif *vif,
193 struct iwl_mvm_scan_params *params)
194 {
195 int global_cnt = 0;
196 enum ieee80211_band band;
197 u8 frag_passive_dwell = 0;
198
199 ieee80211_iterate_active_interfaces_atomic(mvm->hw,
200 IEEE80211_IFACE_ITER_NORMAL,
201 iwl_mvm_scan_condition_iterator,
202 &global_cnt);
203 if (!global_cnt)
204 goto not_bound;
205
206 params->suspend_time = 30;
207 params->max_out_time = 120;
208
209 if (iwl_mvm_low_latency(mvm)) {
210 if (mvm->fw->ucode_capa.api[0] &
211 IWL_UCODE_TLV_API_FRAGMENTED_SCAN) {
212 params->suspend_time = 105;
213 /*
214 * If there is more than one active interface make
215 * passive scan more fragmented.
216 */
217 frag_passive_dwell = 40;
218 params->max_out_time = frag_passive_dwell;
219 } else {
220 params->suspend_time = 120;
221 params->max_out_time = 120;
222 }
223 }
224
225 if (frag_passive_dwell && (mvm->fw->ucode_capa.api[0] &
226 IWL_UCODE_TLV_API_FRAGMENTED_SCAN)) {
227 /*
228 * P2P device scan should not be fragmented to avoid negative
229 * impact on P2P device discovery. Configure max_out_time to be
230 * equal to dwell time on passive channel. Take a longest
231 * possible value, one that corresponds to 2GHz band
232 */
233 if (vif->type == NL80211_IFTYPE_P2P_DEVICE) {
234 u32 passive_dwell =
235 iwl_mvm_get_passive_dwell(mvm,
236 IEEE80211_BAND_2GHZ);
237 params->max_out_time = passive_dwell;
238 } else {
239 params->passive_fragmented = true;
240 }
241 }
242
243 if ((params->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) &&
244 (params->max_out_time > 200))
245 params->max_out_time = 200;
246
247 not_bound:
248
249 for (band = IEEE80211_BAND_2GHZ; band < IEEE80211_NUM_BANDS; band++) {
250 if (params->passive_fragmented)
251 params->dwell[band].fragmented = frag_passive_dwell;
252
253 params->dwell[band].passive = iwl_mvm_get_passive_dwell(mvm,
254 band);
255 params->dwell[band].active =
256 iwl_mvm_get_active_dwell(mvm, band, params->n_ssids);
257 }
258
259 IWL_DEBUG_SCAN(mvm,
260 "scan parameters: max_out_time %d, suspend_time %d, passive_fragmented %d\n",
261 params->max_out_time, params->suspend_time,
262 params->passive_fragmented);
263 IWL_DEBUG_SCAN(mvm,
264 "dwell[IEEE80211_BAND_2GHZ]: passive %d, active %d, fragmented %d\n",
265 params->dwell[IEEE80211_BAND_2GHZ].passive,
266 params->dwell[IEEE80211_BAND_2GHZ].active,
267 params->dwell[IEEE80211_BAND_2GHZ].fragmented);
268 IWL_DEBUG_SCAN(mvm,
269 "dwell[IEEE80211_BAND_5GHZ]: passive %d, active %d, fragmented %d\n",
270 params->dwell[IEEE80211_BAND_5GHZ].passive,
271 params->dwell[IEEE80211_BAND_5GHZ].active,
272 params->dwell[IEEE80211_BAND_5GHZ].fragmented);
273 }
274
275 static inline bool iwl_mvm_rrm_scan_needed(struct iwl_mvm *mvm)
276 {
277 /* require rrm scan whenever the fw supports it */
278 return mvm->fw->ucode_capa.capa[0] &
279 IWL_UCODE_TLV_CAPA_DS_PARAM_SET_IE_SUPPORT;
280 }
281
282 static int iwl_mvm_max_scan_ie_fw_cmd_room(struct iwl_mvm *mvm)
283 {
284 int max_probe_len;
285
286 max_probe_len = SCAN_OFFLOAD_PROBE_REQ_SIZE;
287
288 /* we create the 802.11 header and SSID element */
289 max_probe_len -= 24 + 2;
290
291 /* DS parameter set element is added on 2.4GHZ band if required */
292 if (iwl_mvm_rrm_scan_needed(mvm))
293 max_probe_len -= 3;
294
295 return max_probe_len;
296 }
297
298 int iwl_mvm_max_scan_ie_len(struct iwl_mvm *mvm)
299 {
300 int max_ie_len = iwl_mvm_max_scan_ie_fw_cmd_room(mvm);
301
302 /* TODO: [BUG] This function should return the maximum allowed size of
303 * scan IEs, however the LMAC scan api contains both 2GHZ and 5GHZ IEs
304 * in the same command. So the correct implementation of this function
305 * is just iwl_mvm_max_scan_ie_fw_cmd_room() / 2. Currently the scan
306 * command has only 512 bytes and it would leave us with about 240
307 * bytes for scan IEs, which is clearly not enough. So meanwhile
308 * we will report an incorrect value. This may result in a failure to
309 * issue a scan in unified_scan_lmac and unified_sched_scan_lmac
310 * functions with -ENOBUFS, if a large enough probe will be provided.
311 */
312 return max_ie_len;
313 }
314
315 static u8 *iwl_mvm_dump_channel_list(struct iwl_scan_results_notif *res,
316 int num_res, u8 *buf, size_t buf_size)
317 {
318 int i;
319 u8 *pos = buf, *end = buf + buf_size;
320
321 for (i = 0; pos < end && i < num_res; i++)
322 pos += snprintf(pos, end - pos, " %u", res[i].channel);
323
324 /* terminate the string in case the buffer was too short */
325 *(buf + buf_size - 1) = '\0';
326
327 return buf;
328 }
329
330 int iwl_mvm_rx_scan_offload_iter_complete_notif(struct iwl_mvm *mvm,
331 struct iwl_rx_cmd_buffer *rxb,
332 struct iwl_device_cmd *cmd)
333 {
334 struct iwl_rx_packet *pkt = rxb_addr(rxb);
335 struct iwl_lmac_scan_complete_notif *notif = (void *)pkt->data;
336 u8 buf[256];
337
338 IWL_DEBUG_SCAN(mvm,
339 "Scan offload iteration complete: status=0x%x scanned channels=%d channels list: %s\n",
340 notif->status, notif->scanned_channels,
341 iwl_mvm_dump_channel_list(notif->results,
342 notif->scanned_channels, buf,
343 sizeof(buf)));
344 return 0;
345 }
346
347 int iwl_mvm_rx_scan_offload_results(struct iwl_mvm *mvm,
348 struct iwl_rx_cmd_buffer *rxb,
349 struct iwl_device_cmd *cmd)
350 {
351 IWL_DEBUG_SCAN(mvm, "Scheduled scan results\n");
352 ieee80211_sched_scan_results(mvm->hw);
353
354 return 0;
355 }
356
357 int iwl_mvm_rx_scan_offload_complete_notif(struct iwl_mvm *mvm,
358 struct iwl_rx_cmd_buffer *rxb,
359 struct iwl_device_cmd *cmd)
360 {
361 struct iwl_rx_packet *pkt = rxb_addr(rxb);
362 struct iwl_periodic_scan_complete *scan_notif = (void *)pkt->data;
363 bool aborted = (scan_notif->status == IWL_SCAN_OFFLOAD_ABORTED);
364 bool ebs_successful = (scan_notif->ebs_status == IWL_SCAN_EBS_SUCCESS);
365
366 /* scan status must be locked for proper checking */
367 lockdep_assert_held(&mvm->mutex);
368
369 /* We first check if we were stopping a scan, in which case we
370 * just clear the stopping flag. Then we check if it was a
371 * firmware initiated stop, in which case we need to inform
372 * mac80211.
373 * Note that we can have a stopping and a running scan
374 * simultaneously, but we can't have two different types of
375 * scans stopping or running at the same time (since LMAC
376 * doesn't support it).
377 */
378
379 if (mvm->scan_status & IWL_MVM_SCAN_STOPPING_SCHED) {
380 WARN_ON_ONCE(mvm->scan_status & IWL_MVM_SCAN_STOPPING_REGULAR);
381
382 IWL_DEBUG_SCAN(mvm, "Scheduled scan %s, EBS status %s\n",
383 aborted ? "aborted" : "completed",
384 ebs_successful ? "successful" : "failed");
385
386 mvm->scan_status &= ~IWL_MVM_SCAN_STOPPING_SCHED;
387 } else if (mvm->scan_status & IWL_MVM_SCAN_STOPPING_REGULAR) {
388 IWL_DEBUG_SCAN(mvm, "Regular scan %s, EBS status %s\n",
389 aborted ? "aborted" : "completed",
390 ebs_successful ? "successful" : "failed");
391
392 mvm->scan_status &= ~IWL_MVM_SCAN_STOPPING_REGULAR;
393 } else if (mvm->scan_status & IWL_MVM_SCAN_SCHED) {
394 WARN_ON_ONCE(mvm->scan_status & IWL_MVM_SCAN_REGULAR);
395
396 IWL_DEBUG_SCAN(mvm, "Scheduled scan %s, EBS status %s (FW)\n",
397 aborted ? "aborted" : "completed",
398 ebs_successful ? "successful" : "failed");
399
400 mvm->scan_status &= ~IWL_MVM_SCAN_SCHED;
401 ieee80211_sched_scan_stopped(mvm->hw);
402 } else if (mvm->scan_status & IWL_MVM_SCAN_REGULAR) {
403 IWL_DEBUG_SCAN(mvm, "Regular scan %s, EBS status %s (FW)\n",
404 aborted ? "aborted" : "completed",
405 ebs_successful ? "successful" : "failed");
406
407 mvm->scan_status &= ~IWL_MVM_SCAN_REGULAR;
408 ieee80211_scan_completed(mvm->hw,
409 scan_notif->status == IWL_SCAN_OFFLOAD_ABORTED);
410 iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
411 }
412
413 mvm->last_ebs_successful = ebs_successful;
414
415 return 0;
416 }
417
418 static int iwl_ssid_exist(u8 *ssid, u8 ssid_len, struct iwl_ssid_ie *ssid_list)
419 {
420 int i;
421
422 for (i = 0; i < PROBE_OPTION_MAX; i++) {
423 if (!ssid_list[i].len)
424 break;
425 if (ssid_list[i].len == ssid_len &&
426 !memcmp(ssid_list->ssid, ssid, ssid_len))
427 return i;
428 }
429 return -1;
430 }
431
432 /* We insert the SSIDs in an inverted order, because the FW will
433 * invert it back.
434 */
435 static void iwl_scan_build_ssids(struct iwl_mvm_scan_params *params,
436 struct iwl_ssid_ie *ssids,
437 u32 *ssid_bitmap)
438 {
439 int i, j;
440 int index;
441
442 /*
443 * copy SSIDs from match list.
444 * iwl_config_sched_scan_profiles() uses the order of these ssids to
445 * config match list.
446 */
447 for (i = 0, j = params->n_match_sets - 1;
448 j >= 0 && i < PROBE_OPTION_MAX;
449 i++, j--) {
450 /* skip empty SSID matchsets */
451 if (!params->match_sets[j].ssid.ssid_len)
452 continue;
453 ssids[i].id = WLAN_EID_SSID;
454 ssids[i].len = params->match_sets[j].ssid.ssid_len;
455 memcpy(ssids[i].ssid, params->match_sets[j].ssid.ssid,
456 ssids[i].len);
457 }
458
459 /* add SSIDs from scan SSID list */
460 *ssid_bitmap = 0;
461 for (j = params->n_ssids - 1;
462 j >= 0 && i < PROBE_OPTION_MAX;
463 i++, j--) {
464 index = iwl_ssid_exist(params->ssids[j].ssid,
465 params->ssids[j].ssid_len,
466 ssids);
467 if (index < 0) {
468 ssids[i].id = WLAN_EID_SSID;
469 ssids[i].len = params->ssids[j].ssid_len;
470 memcpy(ssids[i].ssid, params->ssids[j].ssid,
471 ssids[i].len);
472 *ssid_bitmap |= BIT(i);
473 } else {
474 *ssid_bitmap |= BIT(index);
475 }
476 }
477 }
478
479 static int
480 iwl_mvm_config_sched_scan_profiles(struct iwl_mvm *mvm,
481 struct cfg80211_sched_scan_request *req)
482 {
483 struct iwl_scan_offload_profile *profile;
484 struct iwl_scan_offload_profile_cfg *profile_cfg;
485 struct iwl_scan_offload_blacklist *blacklist;
486 struct iwl_host_cmd cmd = {
487 .id = SCAN_OFFLOAD_UPDATE_PROFILES_CMD,
488 .len[1] = sizeof(*profile_cfg),
489 .dataflags[0] = IWL_HCMD_DFL_NOCOPY,
490 .dataflags[1] = IWL_HCMD_DFL_NOCOPY,
491 };
492 int blacklist_len;
493 int i;
494 int ret;
495
496 if (WARN_ON(req->n_match_sets > IWL_SCAN_MAX_PROFILES))
497 return -EIO;
498
499 if (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_SHORT_BL)
500 blacklist_len = IWL_SCAN_SHORT_BLACKLIST_LEN;
501 else
502 blacklist_len = IWL_SCAN_MAX_BLACKLIST_LEN;
503
504 blacklist = kzalloc(sizeof(*blacklist) * blacklist_len, GFP_KERNEL);
505 if (!blacklist)
506 return -ENOMEM;
507
508 profile_cfg = kzalloc(sizeof(*profile_cfg), GFP_KERNEL);
509 if (!profile_cfg) {
510 ret = -ENOMEM;
511 goto free_blacklist;
512 }
513
514 cmd.data[0] = blacklist;
515 cmd.len[0] = sizeof(*blacklist) * blacklist_len;
516 cmd.data[1] = profile_cfg;
517
518 /* No blacklist configuration */
519
520 profile_cfg->num_profiles = req->n_match_sets;
521 profile_cfg->active_clients = SCAN_CLIENT_SCHED_SCAN;
522 profile_cfg->pass_match = SCAN_CLIENT_SCHED_SCAN;
523 profile_cfg->match_notify = SCAN_CLIENT_SCHED_SCAN;
524 if (!req->n_match_sets || !req->match_sets[0].ssid.ssid_len)
525 profile_cfg->any_beacon_notify = SCAN_CLIENT_SCHED_SCAN;
526
527 for (i = 0; i < req->n_match_sets; i++) {
528 profile = &profile_cfg->profiles[i];
529 profile->ssid_index = i;
530 /* Support any cipher and auth algorithm */
531 profile->unicast_cipher = 0xff;
532 profile->auth_alg = 0xff;
533 profile->network_type = IWL_NETWORK_TYPE_ANY;
534 profile->band_selection = IWL_SCAN_OFFLOAD_SELECT_ANY;
535 profile->client_bitmap = SCAN_CLIENT_SCHED_SCAN;
536 }
537
538 IWL_DEBUG_SCAN(mvm, "Sending scheduled scan profile config\n");
539
540 ret = iwl_mvm_send_cmd(mvm, &cmd);
541 kfree(profile_cfg);
542 free_blacklist:
543 kfree(blacklist);
544
545 return ret;
546 }
547
548 static bool iwl_mvm_scan_pass_all(struct iwl_mvm *mvm,
549 struct cfg80211_sched_scan_request *req)
550 {
551 if (req->n_match_sets && req->match_sets[0].ssid.ssid_len) {
552 IWL_DEBUG_SCAN(mvm,
553 "Sending scheduled scan with filtering, n_match_sets %d\n",
554 req->n_match_sets);
555 return false;
556 }
557
558 IWL_DEBUG_SCAN(mvm, "Sending Scheduled scan without filtering\n");
559 return true;
560 }
561
562 static int iwl_mvm_send_scan_offload_abort(struct iwl_mvm *mvm)
563 {
564 int ret;
565 struct iwl_host_cmd cmd = {
566 .id = SCAN_OFFLOAD_ABORT_CMD,
567 };
568 u32 status;
569
570 ret = iwl_mvm_send_cmd_status(mvm, &cmd, &status);
571 if (ret)
572 return ret;
573
574 if (status != CAN_ABORT_STATUS) {
575 /*
576 * The scan abort will return 1 for success or
577 * 2 for "failure". A failure condition can be
578 * due to simply not being in an active scan which
579 * can occur if we send the scan abort before the
580 * microcode has notified us that a scan is completed.
581 */
582 IWL_DEBUG_SCAN(mvm, "SCAN OFFLOAD ABORT ret %d.\n", status);
583 ret = -ENOENT;
584 }
585
586 return ret;
587 }
588
589 static int iwl_mvm_lmac_scan_stop(struct iwl_mvm *mvm, int type)
590 {
591 int ret;
592 struct iwl_notification_wait wait_scan_done;
593 static const u8 scan_done_notif[] = { SCAN_OFFLOAD_COMPLETE, };
594 bool sched = type & IWL_MVM_SCAN_SCHED;
595
596 lockdep_assert_held(&mvm->mutex);
597
598 iwl_init_notification_wait(&mvm->notif_wait, &wait_scan_done,
599 scan_done_notif,
600 ARRAY_SIZE(scan_done_notif),
601 NULL, NULL);
602
603 ret = iwl_mvm_send_scan_offload_abort(mvm);
604 if (ret) {
605 IWL_DEBUG_SCAN(mvm, "Send stop %sscan failed %d\n",
606 sched ? "offloaded " : "", ret);
607 iwl_remove_notification(&mvm->notif_wait, &wait_scan_done);
608 goto out;
609 }
610
611 IWL_DEBUG_SCAN(mvm, "Successfully sent stop %sscan\n",
612 sched ? "scheduled " : "");
613
614 ret = iwl_wait_notification(&mvm->notif_wait, &wait_scan_done, 1 * HZ);
615 out:
616 return ret;
617 }
618
619 static void iwl_mvm_scan_fill_tx_cmd(struct iwl_mvm *mvm,
620 struct iwl_scan_req_tx_cmd *tx_cmd,
621 bool no_cck)
622 {
623 tx_cmd[0].tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL |
624 TX_CMD_FLG_BT_DIS);
625 tx_cmd[0].rate_n_flags = iwl_mvm_scan_rate_n_flags(mvm,
626 IEEE80211_BAND_2GHZ,
627 no_cck);
628 tx_cmd[0].sta_id = mvm->aux_sta.sta_id;
629
630 tx_cmd[1].tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL |
631 TX_CMD_FLG_BT_DIS);
632 tx_cmd[1].rate_n_flags = iwl_mvm_scan_rate_n_flags(mvm,
633 IEEE80211_BAND_5GHZ,
634 no_cck);
635 tx_cmd[1].sta_id = mvm->aux_sta.sta_id;
636 }
637
638 static void
639 iwl_mvm_lmac_scan_cfg_channels(struct iwl_mvm *mvm,
640 struct ieee80211_channel **channels,
641 int n_channels, u32 ssid_bitmap,
642 struct iwl_scan_req_lmac *cmd)
643 {
644 struct iwl_scan_channel_cfg_lmac *channel_cfg = (void *)&cmd->data;
645 int i;
646
647 for (i = 0; i < n_channels; i++) {
648 channel_cfg[i].channel_num =
649 cpu_to_le16(channels[i]->hw_value);
650 channel_cfg[i].iter_count = cpu_to_le16(1);
651 channel_cfg[i].iter_interval = 0;
652 channel_cfg[i].flags =
653 cpu_to_le32(IWL_UNIFIED_SCAN_CHANNEL_PARTIAL |
654 ssid_bitmap);
655 }
656 }
657
658 static u8 *iwl_mvm_copy_and_insert_ds_elem(struct iwl_mvm *mvm, const u8 *ies,
659 size_t len, u8 *const pos)
660 {
661 static const u8 before_ds_params[] = {
662 WLAN_EID_SSID,
663 WLAN_EID_SUPP_RATES,
664 WLAN_EID_REQUEST,
665 WLAN_EID_EXT_SUPP_RATES,
666 };
667 size_t offs;
668 u8 *newpos = pos;
669
670 if (!iwl_mvm_rrm_scan_needed(mvm)) {
671 memcpy(newpos, ies, len);
672 return newpos + len;
673 }
674
675 offs = ieee80211_ie_split(ies, len,
676 before_ds_params,
677 ARRAY_SIZE(before_ds_params),
678 0);
679
680 memcpy(newpos, ies, offs);
681 newpos += offs;
682
683 /* Add a placeholder for DS Parameter Set element */
684 *newpos++ = WLAN_EID_DS_PARAMS;
685 *newpos++ = 1;
686 *newpos++ = 0;
687
688 memcpy(newpos, ies + offs, len - offs);
689 newpos += len - offs;
690
691 return newpos;
692 }
693
694 static void
695 iwl_mvm_build_scan_probe(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
696 struct ieee80211_scan_ies *ies,
697 struct iwl_mvm_scan_params *params)
698 {
699 struct ieee80211_mgmt *frame = (void *)params->preq.buf;
700 u8 *pos, *newpos;
701 const u8 *mac_addr = params->flags & NL80211_SCAN_FLAG_RANDOM_ADDR ?
702 params->mac_addr : NULL;
703
704 /*
705 * Unfortunately, right now the offload scan doesn't support randomising
706 * within the firmware, so until the firmware API is ready we implement
707 * it in the driver. This means that the scan iterations won't really be
708 * random, only when it's restarted, but at least that helps a bit.
709 */
710 if (mac_addr)
711 get_random_mask_addr(frame->sa, mac_addr,
712 params->mac_addr_mask);
713 else
714 memcpy(frame->sa, vif->addr, ETH_ALEN);
715
716 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
717 eth_broadcast_addr(frame->da);
718 eth_broadcast_addr(frame->bssid);
719 frame->seq_ctrl = 0;
720
721 pos = frame->u.probe_req.variable;
722 *pos++ = WLAN_EID_SSID;
723 *pos++ = 0;
724
725 params->preq.mac_header.offset = 0;
726 params->preq.mac_header.len = cpu_to_le16(24 + 2);
727
728 /* Insert ds parameter set element on 2.4 GHz band */
729 newpos = iwl_mvm_copy_and_insert_ds_elem(mvm,
730 ies->ies[IEEE80211_BAND_2GHZ],
731 ies->len[IEEE80211_BAND_2GHZ],
732 pos);
733 params->preq.band_data[0].offset = cpu_to_le16(pos - params->preq.buf);
734 params->preq.band_data[0].len = cpu_to_le16(newpos - pos);
735 pos = newpos;
736
737 memcpy(pos, ies->ies[IEEE80211_BAND_5GHZ],
738 ies->len[IEEE80211_BAND_5GHZ]);
739 params->preq.band_data[1].offset = cpu_to_le16(pos - params->preq.buf);
740 params->preq.band_data[1].len =
741 cpu_to_le16(ies->len[IEEE80211_BAND_5GHZ]);
742 pos += ies->len[IEEE80211_BAND_5GHZ];
743
744 memcpy(pos, ies->common_ies, ies->common_ie_len);
745 params->preq.common_data.offset = cpu_to_le16(pos - params->preq.buf);
746 params->preq.common_data.len = cpu_to_le16(ies->common_ie_len);
747 }
748
749 static void iwl_mvm_scan_lmac_dwell(struct iwl_mvm *mvm,
750 struct iwl_scan_req_lmac *cmd,
751 struct iwl_mvm_scan_params *params)
752 {
753 cmd->active_dwell = params->dwell[IEEE80211_BAND_2GHZ].active;
754 cmd->passive_dwell = params->dwell[IEEE80211_BAND_2GHZ].passive;
755 if (params->passive_fragmented)
756 cmd->fragmented_dwell =
757 params->dwell[IEEE80211_BAND_2GHZ].fragmented;
758 cmd->max_out_time = cpu_to_le32(params->max_out_time);
759 cmd->suspend_time = cpu_to_le32(params->suspend_time);
760 cmd->scan_prio = cpu_to_le32(IWL_SCAN_PRIORITY_HIGH);
761 }
762
763 static inline bool iwl_mvm_scan_fits(struct iwl_mvm *mvm, int n_ssids,
764 struct ieee80211_scan_ies *ies,
765 int n_channels)
766 {
767 return ((n_ssids <= PROBE_OPTION_MAX) &&
768 (n_channels <= mvm->fw->ucode_capa.n_scan_channels) &
769 (ies->common_ie_len +
770 ies->len[NL80211_BAND_2GHZ] +
771 ies->len[NL80211_BAND_5GHZ] <=
772 iwl_mvm_max_scan_ie_fw_cmd_room(mvm)));
773 }
774
775 static inline bool iwl_mvm_scan_use_ebs(struct iwl_mvm *mvm, int n_iterations)
776 {
777 const struct iwl_ucode_capabilities *capa = &mvm->fw->ucode_capa;
778
779 /* We can only use EBS if:
780 * 1. the feature is supported;
781 * 2. the last EBS was successful;
782 * 3. if only single scan, the single scan EBS API is supported.
783 */
784 return ((capa->flags & IWL_UCODE_TLV_FLAGS_EBS_SUPPORT) &&
785 mvm->last_ebs_successful &&
786 (n_iterations > 1 ||
787 (capa->api[0] & IWL_UCODE_TLV_API_SINGLE_SCAN_EBS)));
788 }
789
790 static int iwl_mvm_scan_total_iterations(struct iwl_mvm_scan_params *params)
791 {
792 return params->schedule[0].iterations + params->schedule[1].iterations;
793 }
794
795 static int iwl_mvm_scan_lmac_flags(struct iwl_mvm *mvm,
796 struct iwl_mvm_scan_params *params)
797 {
798 int flags = 0;
799
800 if (params->n_ssids == 0)
801 flags |= IWL_MVM_LMAC_SCAN_FLAG_PASSIVE;
802
803 if (params->n_ssids == 1 && params->ssids[0].ssid_len != 0)
804 flags |= IWL_MVM_LMAC_SCAN_FLAG_PRE_CONNECTION;
805
806 if (params->passive_fragmented)
807 flags |= IWL_MVM_LMAC_SCAN_FLAG_FRAGMENTED;
808
809 if (iwl_mvm_rrm_scan_needed(mvm))
810 flags |= IWL_MVM_LMAC_SCAN_FLAGS_RRM_ENABLED;
811
812 if (params->pass_all)
813 flags |= IWL_MVM_LMAC_SCAN_FLAG_PASS_ALL;
814 else
815 flags |= IWL_MVM_LMAC_SCAN_FLAG_MATCH;
816
817 #ifdef CONFIG_IWLWIFI_DEBUGFS
818 if (mvm->scan_iter_notif_enabled)
819 flags |= IWL_MVM_LMAC_SCAN_FLAG_ITER_COMPLETE;
820 #endif
821
822 return flags;
823 }
824
825 static int iwl_mvm_scan_lmac(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
826 struct iwl_mvm_scan_params *params)
827 {
828 struct iwl_scan_req_lmac *cmd = mvm->scan_cmd;
829 struct iwl_scan_probe_req *preq =
830 (void *)(cmd->data + sizeof(struct iwl_scan_channel_cfg_lmac) *
831 mvm->fw->ucode_capa.n_scan_channels);
832 u32 ssid_bitmap = 0;
833 int n_iterations = iwl_mvm_scan_total_iterations(params);
834
835 lockdep_assert_held(&mvm->mutex);
836
837 memset(cmd, 0, ksize(cmd));
838
839 iwl_mvm_scan_lmac_dwell(mvm, cmd, params);
840
841 cmd->rx_chain_select = iwl_mvm_scan_rx_chain(mvm);
842 cmd->iter_num = cpu_to_le32(1);
843 cmd->n_channels = (u8)params->n_channels;
844
845 cmd->delay = cpu_to_le32(params->delay);
846
847 cmd->scan_flags = cpu_to_le32(iwl_mvm_scan_lmac_flags(mvm, params));
848
849 cmd->flags = iwl_mvm_scan_rxon_flags(params->channels[0]->band);
850 cmd->filter_flags = cpu_to_le32(MAC_FILTER_ACCEPT_GRP |
851 MAC_FILTER_IN_BEACON);
852 iwl_mvm_scan_fill_tx_cmd(mvm, cmd->tx_cmd, params->no_cck);
853 iwl_scan_build_ssids(params, cmd->direct_scan, &ssid_bitmap);
854
855 /* this API uses bits 1-20 instead of 0-19 */
856 ssid_bitmap <<= 1;
857
858 cmd->schedule[0].delay = cpu_to_le16(params->interval);
859 cmd->schedule[0].iterations = params->schedule[0].iterations;
860 cmd->schedule[0].full_scan_mul = params->schedule[0].full_scan_mul;
861 cmd->schedule[1].delay = cpu_to_le16(params->interval);
862 cmd->schedule[1].iterations = params->schedule[1].iterations;
863 cmd->schedule[1].full_scan_mul = params->schedule[1].iterations;
864
865 if (iwl_mvm_scan_use_ebs(mvm, n_iterations)) {
866 cmd->channel_opt[0].flags =
867 cpu_to_le16(IWL_SCAN_CHANNEL_FLAG_EBS |
868 IWL_SCAN_CHANNEL_FLAG_EBS_ACCURATE |
869 IWL_SCAN_CHANNEL_FLAG_CACHE_ADD);
870 cmd->channel_opt[0].non_ebs_ratio =
871 cpu_to_le16(IWL_DENSE_EBS_SCAN_RATIO);
872 cmd->channel_opt[1].flags =
873 cpu_to_le16(IWL_SCAN_CHANNEL_FLAG_EBS |
874 IWL_SCAN_CHANNEL_FLAG_EBS_ACCURATE |
875 IWL_SCAN_CHANNEL_FLAG_CACHE_ADD);
876 cmd->channel_opt[1].non_ebs_ratio =
877 cpu_to_le16(IWL_SPARSE_EBS_SCAN_RATIO);
878 }
879
880 iwl_mvm_lmac_scan_cfg_channels(mvm, params->channels,
881 params->n_channels, ssid_bitmap, cmd);
882
883 *preq = params->preq;
884
885 return 0;
886 }
887
888 int iwl_mvm_reg_scan_stop(struct iwl_mvm *mvm)
889 {
890 int ret;
891
892 if (mvm->fw->ucode_capa.capa[0] & IWL_UCODE_TLV_CAPA_UMAC_SCAN)
893 return iwl_umac_scan_stop(mvm, IWL_MVM_SCAN_REGULAR, true);
894
895 if (!(mvm->scan_status & IWL_MVM_SCAN_REGULAR))
896 return 0;
897
898 if (iwl_mvm_is_radio_killed(mvm)) {
899 ret = 0;
900 goto out;
901 }
902
903 ret = iwl_mvm_lmac_scan_stop(mvm, IWL_MVM_SCAN_REGULAR);
904 if (!ret)
905 mvm->scan_status |= IWL_MVM_SCAN_STOPPING_REGULAR;
906 out:
907 /* Clear the scan status so the next scan requests will
908 * succeed and mark the scan as stopping, so that the Rx
909 * handler doesn't do anything, as the scan was stopped from
910 * above. Since the rx handler won't do anything now, we have
911 * to release the scan reference here.
912 */
913 iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
914
915 mvm->scan_status &= ~IWL_MVM_SCAN_REGULAR;
916 ieee80211_scan_completed(mvm->hw, true);
917
918 return ret;
919 }
920
921 int iwl_mvm_sched_scan_stop(struct iwl_mvm *mvm, bool notify)
922 {
923 int ret;
924
925 if (mvm->fw->ucode_capa.capa[0] & IWL_UCODE_TLV_CAPA_UMAC_SCAN)
926 return iwl_umac_scan_stop(mvm, IWL_MVM_SCAN_SCHED, notify);
927
928 if (!(mvm->scan_status & IWL_MVM_SCAN_SCHED))
929 return 0;
930
931 if (iwl_mvm_is_radio_killed(mvm)) {
932 ret = 0;
933 goto out;
934 }
935
936 ret = iwl_mvm_lmac_scan_stop(mvm, IWL_MVM_SCAN_SCHED);
937 if (!ret)
938 mvm->scan_status |= IWL_MVM_SCAN_STOPPING_SCHED;
939 out:
940 mvm->scan_status &= ~IWL_MVM_SCAN_SCHED;
941 if (notify)
942 ieee80211_sched_scan_stopped(mvm->hw);
943
944 return ret;
945 }
946
947 /* UMAC scan API */
948
949 struct iwl_umac_scan_done {
950 struct iwl_mvm *mvm;
951 int type;
952 };
953
954 static int rate_to_scan_rate_flag(unsigned int rate)
955 {
956 static const int rate_to_scan_rate[IWL_RATE_COUNT] = {
957 [IWL_RATE_1M_INDEX] = SCAN_CONFIG_RATE_1M,
958 [IWL_RATE_2M_INDEX] = SCAN_CONFIG_RATE_2M,
959 [IWL_RATE_5M_INDEX] = SCAN_CONFIG_RATE_5M,
960 [IWL_RATE_11M_INDEX] = SCAN_CONFIG_RATE_11M,
961 [IWL_RATE_6M_INDEX] = SCAN_CONFIG_RATE_6M,
962 [IWL_RATE_9M_INDEX] = SCAN_CONFIG_RATE_9M,
963 [IWL_RATE_12M_INDEX] = SCAN_CONFIG_RATE_12M,
964 [IWL_RATE_18M_INDEX] = SCAN_CONFIG_RATE_18M,
965 [IWL_RATE_24M_INDEX] = SCAN_CONFIG_RATE_24M,
966 [IWL_RATE_36M_INDEX] = SCAN_CONFIG_RATE_36M,
967 [IWL_RATE_48M_INDEX] = SCAN_CONFIG_RATE_48M,
968 [IWL_RATE_54M_INDEX] = SCAN_CONFIG_RATE_54M,
969 };
970
971 return rate_to_scan_rate[rate];
972 }
973
974 static __le32 iwl_mvm_scan_config_rates(struct iwl_mvm *mvm)
975 {
976 struct ieee80211_supported_band *band;
977 unsigned int rates = 0;
978 int i;
979
980 band = &mvm->nvm_data->bands[IEEE80211_BAND_2GHZ];
981 for (i = 0; i < band->n_bitrates; i++)
982 rates |= rate_to_scan_rate_flag(band->bitrates[i].hw_value);
983 band = &mvm->nvm_data->bands[IEEE80211_BAND_5GHZ];
984 for (i = 0; i < band->n_bitrates; i++)
985 rates |= rate_to_scan_rate_flag(band->bitrates[i].hw_value);
986
987 /* Set both basic rates and supported rates */
988 rates |= SCAN_CONFIG_SUPPORTED_RATE(rates);
989
990 return cpu_to_le32(rates);
991 }
992
993 int iwl_mvm_config_scan(struct iwl_mvm *mvm)
994 {
995
996 struct iwl_scan_config *scan_config;
997 struct ieee80211_supported_band *band;
998 int num_channels =
999 mvm->nvm_data->bands[IEEE80211_BAND_2GHZ].n_channels +
1000 mvm->nvm_data->bands[IEEE80211_BAND_5GHZ].n_channels;
1001 int ret, i, j = 0, cmd_size, data_size;
1002 struct iwl_host_cmd cmd = {
1003 .id = SCAN_CFG_CMD,
1004 };
1005
1006 if (WARN_ON(num_channels > mvm->fw->ucode_capa.n_scan_channels))
1007 return -ENOBUFS;
1008
1009 cmd_size = sizeof(*scan_config) + mvm->fw->ucode_capa.n_scan_channels;
1010
1011 scan_config = kzalloc(cmd_size, GFP_KERNEL);
1012 if (!scan_config)
1013 return -ENOMEM;
1014
1015 data_size = cmd_size - sizeof(struct iwl_mvm_umac_cmd_hdr);
1016 scan_config->hdr.size = cpu_to_le16(data_size);
1017 scan_config->flags = cpu_to_le32(SCAN_CONFIG_FLAG_ACTIVATE |
1018 SCAN_CONFIG_FLAG_ALLOW_CHUB_REQS |
1019 SCAN_CONFIG_FLAG_SET_TX_CHAINS |
1020 SCAN_CONFIG_FLAG_SET_RX_CHAINS |
1021 SCAN_CONFIG_FLAG_SET_ALL_TIMES |
1022 SCAN_CONFIG_FLAG_SET_LEGACY_RATES |
1023 SCAN_CONFIG_FLAG_SET_MAC_ADDR |
1024 SCAN_CONFIG_FLAG_SET_CHANNEL_FLAGS|
1025 SCAN_CONFIG_N_CHANNELS(num_channels));
1026 scan_config->tx_chains = cpu_to_le32(iwl_mvm_get_valid_tx_ant(mvm));
1027 scan_config->rx_chains = cpu_to_le32(iwl_mvm_scan_rx_ant(mvm));
1028 scan_config->legacy_rates = iwl_mvm_scan_config_rates(mvm);
1029 scan_config->out_of_channel_time = cpu_to_le32(170);
1030 scan_config->suspend_time = cpu_to_le32(30);
1031 scan_config->dwell_active = 20;
1032 scan_config->dwell_passive = 110;
1033 scan_config->dwell_fragmented = 20;
1034
1035 memcpy(&scan_config->mac_addr, &mvm->addresses[0].addr, ETH_ALEN);
1036
1037 scan_config->bcast_sta_id = mvm->aux_sta.sta_id;
1038 scan_config->channel_flags = IWL_CHANNEL_FLAG_EBS |
1039 IWL_CHANNEL_FLAG_ACCURATE_EBS |
1040 IWL_CHANNEL_FLAG_EBS_ADD |
1041 IWL_CHANNEL_FLAG_PRE_SCAN_PASSIVE2ACTIVE;
1042
1043 band = &mvm->nvm_data->bands[IEEE80211_BAND_2GHZ];
1044 for (i = 0; i < band->n_channels; i++, j++)
1045 scan_config->channel_array[j] = band->channels[i].hw_value;
1046 band = &mvm->nvm_data->bands[IEEE80211_BAND_5GHZ];
1047 for (i = 0; i < band->n_channels; i++, j++)
1048 scan_config->channel_array[j] = band->channels[i].hw_value;
1049
1050 cmd.data[0] = scan_config;
1051 cmd.len[0] = cmd_size;
1052 cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
1053
1054 IWL_DEBUG_SCAN(mvm, "Sending UMAC scan config\n");
1055
1056 ret = iwl_mvm_send_cmd(mvm, &cmd);
1057
1058 kfree(scan_config);
1059 return ret;
1060 }
1061
1062 static int iwl_mvm_find_scan_uid(struct iwl_mvm *mvm, u32 uid)
1063 {
1064 int i;
1065
1066 for (i = 0; i < mvm->max_scans; i++)
1067 if (mvm->scan_uid[i] == uid)
1068 return i;
1069
1070 return i;
1071 }
1072
1073 static int iwl_mvm_find_free_scan_uid(struct iwl_mvm *mvm)
1074 {
1075 return iwl_mvm_find_scan_uid(mvm, 0);
1076 }
1077
1078 static bool iwl_mvm_find_scan_type(struct iwl_mvm *mvm, int type)
1079 {
1080 int i;
1081
1082 for (i = 0; i < mvm->max_scans; i++)
1083 if (mvm->scan_uid[i] & type)
1084 return true;
1085
1086 return false;
1087 }
1088
1089 static int iwl_mvm_find_first_scan(struct iwl_mvm *mvm, int type)
1090 {
1091 int i;
1092
1093 for (i = 0; i < mvm->max_scans; i++)
1094 if (mvm->scan_uid[i] & type)
1095 return i;
1096
1097 return i;
1098 }
1099
1100 static u32 iwl_generate_scan_uid(struct iwl_mvm *mvm, int type)
1101 {
1102 u32 uid;
1103
1104 /* make sure exactly one bit is on in scan type */
1105 WARN_ON(hweight8(type) != 1);
1106
1107 /*
1108 * Make sure scan uids are unique. If one scan lasts long time while
1109 * others are completing frequently, the seq number will wrap up and
1110 * we may have more than one scan with the same uid.
1111 */
1112 do {
1113 uid = type | (mvm->scan_seq_num <<
1114 IWL_UMAC_SCAN_UID_SEQ_OFFSET);
1115 mvm->scan_seq_num++;
1116 } while (iwl_mvm_find_scan_uid(mvm, uid) < mvm->max_scans);
1117
1118 IWL_DEBUG_SCAN(mvm, "Generated scan UID %u\n", uid);
1119
1120 return uid;
1121 }
1122
1123 static void iwl_mvm_scan_umac_dwell(struct iwl_mvm *mvm,
1124 struct iwl_scan_req_umac *cmd,
1125 struct iwl_mvm_scan_params *params)
1126 {
1127 cmd->active_dwell = params->dwell[IEEE80211_BAND_2GHZ].active;
1128 cmd->passive_dwell = params->dwell[IEEE80211_BAND_2GHZ].passive;
1129 if (params->passive_fragmented)
1130 cmd->fragmented_dwell =
1131 params->dwell[IEEE80211_BAND_2GHZ].fragmented;
1132 cmd->max_out_time = cpu_to_le32(params->max_out_time);
1133 cmd->suspend_time = cpu_to_le32(params->suspend_time);
1134 cmd->scan_priority = cpu_to_le32(IWL_SCAN_PRIORITY_HIGH);
1135
1136 if (iwl_mvm_scan_total_iterations(params) == 0)
1137 cmd->ooc_priority = cpu_to_le32(IWL_SCAN_PRIORITY_HIGH);
1138 else
1139 cmd->ooc_priority = cpu_to_le32(IWL_SCAN_PRIORITY_LOW);
1140 }
1141
1142 static void
1143 iwl_mvm_umac_scan_cfg_channels(struct iwl_mvm *mvm,
1144 struct ieee80211_channel **channels,
1145 int n_channels, u32 ssid_bitmap,
1146 struct iwl_scan_req_umac *cmd)
1147 {
1148 struct iwl_scan_channel_cfg_umac *channel_cfg = (void *)&cmd->data;
1149 int i;
1150
1151 for (i = 0; i < n_channels; i++) {
1152 channel_cfg[i].flags = cpu_to_le32(ssid_bitmap);
1153 channel_cfg[i].channel_num = channels[i]->hw_value;
1154 channel_cfg[i].iter_count = 1;
1155 channel_cfg[i].iter_interval = 0;
1156 }
1157 }
1158
1159 static u32 iwl_mvm_scan_umac_flags(struct iwl_mvm *mvm,
1160 struct iwl_mvm_scan_params *params)
1161 {
1162 int flags = 0;
1163
1164 if (params->n_ssids == 0)
1165 flags = IWL_UMAC_SCAN_GEN_FLAGS_PASSIVE;
1166
1167 if (params->n_ssids == 1 && params->ssids[0].ssid_len != 0)
1168 flags |= IWL_UMAC_SCAN_GEN_FLAGS_PRE_CONNECT;
1169
1170 if (params->passive_fragmented)
1171 flags |= IWL_UMAC_SCAN_GEN_FLAGS_FRAGMENTED;
1172
1173 if (iwl_mvm_rrm_scan_needed(mvm))
1174 flags |= IWL_UMAC_SCAN_GEN_FLAGS_RRM_ENABLED;
1175
1176 if (params->pass_all)
1177 flags |= IWL_UMAC_SCAN_GEN_FLAGS_PASS_ALL;
1178 else
1179 flags |= IWL_UMAC_SCAN_GEN_FLAGS_MATCH;
1180
1181 if (iwl_mvm_scan_total_iterations(params) > 1)
1182 flags |= IWL_UMAC_SCAN_GEN_FLAGS_PERIODIC;
1183
1184 #ifdef CONFIG_IWLWIFI_DEBUGFS
1185 if (mvm->scan_iter_notif_enabled)
1186 flags |= IWL_UMAC_SCAN_GEN_FLAGS_ITER_COMPLETE;
1187 #endif
1188 return flags;
1189 }
1190
1191 static int iwl_mvm_scan_umac(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1192 struct iwl_mvm_scan_params *params)
1193 {
1194 struct iwl_scan_req_umac *cmd = mvm->scan_cmd;
1195 struct iwl_scan_req_umac_tail *sec_part = (void *)&cmd->data +
1196 sizeof(struct iwl_scan_channel_cfg_umac) *
1197 mvm->fw->ucode_capa.n_scan_channels;
1198 u32 uid;
1199 u32 ssid_bitmap = 0;
1200 int n_iterations = iwl_mvm_scan_total_iterations(params);
1201 int uid_idx;
1202
1203 lockdep_assert_held(&mvm->mutex);
1204
1205 uid_idx = iwl_mvm_find_free_scan_uid(mvm);
1206 if (uid_idx >= mvm->max_scans)
1207 return -EBUSY;
1208
1209 memset(cmd, 0, ksize(cmd));
1210 cmd->hdr.size = cpu_to_le16(iwl_mvm_scan_size(mvm) -
1211 sizeof(struct iwl_mvm_umac_cmd_hdr));
1212
1213 iwl_mvm_scan_umac_dwell(mvm, cmd, params);
1214
1215 if (n_iterations == 1)
1216 uid = iwl_generate_scan_uid(mvm, IWL_MVM_SCAN_REGULAR);
1217 else
1218 uid = iwl_generate_scan_uid(mvm, IWL_MVM_SCAN_SCHED);
1219
1220 mvm->scan_uid[uid_idx] = uid;
1221 cmd->uid = cpu_to_le32(uid);
1222
1223 cmd->general_flags = cpu_to_le32(iwl_mvm_scan_umac_flags(mvm, params));
1224
1225 if (iwl_mvm_scan_use_ebs(mvm, n_iterations))
1226 cmd->channel_flags = IWL_SCAN_CHANNEL_FLAG_EBS |
1227 IWL_SCAN_CHANNEL_FLAG_EBS_ACCURATE |
1228 IWL_SCAN_CHANNEL_FLAG_CACHE_ADD;
1229
1230 cmd->n_channels = params->n_channels;
1231
1232 iwl_scan_build_ssids(params, sec_part->direct_scan, &ssid_bitmap);
1233
1234 iwl_mvm_umac_scan_cfg_channels(mvm, params->channels,
1235 params->n_channels, ssid_bitmap, cmd);
1236
1237 /* With UMAC we use only one schedule for now, so use the sum
1238 * of the iterations (with a a maximum of 255).
1239 */
1240 sec_part->schedule[0].iter_count =
1241 (n_iterations > 255) ? 255 : n_iterations;
1242 sec_part->schedule[0].interval = cpu_to_le16(params->interval);
1243
1244 sec_part->delay = cpu_to_le16(params->delay);
1245 sec_part->preq = params->preq;
1246
1247 return 0;
1248 }
1249
1250 static int iwl_mvm_num_scans(struct iwl_mvm *mvm)
1251 {
1252 return hweight32(mvm->scan_status & IWL_MVM_SCAN_MASK);
1253 }
1254
1255 static int iwl_mvm_check_running_scans(struct iwl_mvm *mvm, int type)
1256 {
1257 /* This looks a bit arbitrary, but the idea is that if we run
1258 * out of possible simultaneous scans and the userspace is
1259 * trying to run a scan type that is already running, we
1260 * return -EBUSY. But if the userspace wants to start a
1261 * different type of scan, we stop the opposite type to make
1262 * space for the new request. The reason is backwards
1263 * compatibility with old wpa_supplicant that wouldn't stop a
1264 * scheduled scan before starting a normal scan.
1265 */
1266
1267 if (iwl_mvm_num_scans(mvm) < mvm->max_scans)
1268 return 0;
1269
1270 /* Use a switch, even though this is a bitmask, so that more
1271 * than one bits set will fall in default and we will warn.
1272 */
1273 switch (type) {
1274 case IWL_MVM_SCAN_REGULAR:
1275 if (mvm->scan_status & IWL_MVM_SCAN_REGULAR_MASK)
1276 return -EBUSY;
1277 return iwl_mvm_sched_scan_stop(mvm, true);
1278 case IWL_MVM_SCAN_SCHED:
1279 if (mvm->scan_status & IWL_MVM_SCAN_SCHED_MASK)
1280 return -EBUSY;
1281 return iwl_mvm_reg_scan_stop(mvm);
1282 case IWL_MVM_SCAN_NETDETECT:
1283 /* No need to stop anything for net-detect since the
1284 * firmware is restarted anyway. This way, any sched
1285 * scans that were running will be restarted when we
1286 * resume.
1287 */
1288 return 0;
1289 default:
1290 WARN_ON(1);
1291 break;
1292 }
1293
1294 return -EIO;
1295 }
1296
1297 int iwl_mvm_reg_scan_start(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1298 struct cfg80211_scan_request *req,
1299 struct ieee80211_scan_ies *ies)
1300 {
1301 struct iwl_host_cmd hcmd = {
1302 .len = { iwl_mvm_scan_size(mvm), },
1303 .data = { mvm->scan_cmd, },
1304 .dataflags = { IWL_HCMD_DFL_NOCOPY, },
1305 };
1306 struct iwl_mvm_scan_params params = {};
1307 int ret;
1308
1309 lockdep_assert_held(&mvm->mutex);
1310
1311 if (iwl_mvm_is_lar_supported(mvm) && !mvm->lar_regdom_set) {
1312 IWL_ERR(mvm, "scan while LAR regdomain is not set\n");
1313 return -EBUSY;
1314 }
1315
1316 ret = iwl_mvm_check_running_scans(mvm, IWL_MVM_SCAN_REGULAR);
1317 if (ret)
1318 return ret;
1319
1320 iwl_mvm_ref(mvm, IWL_MVM_REF_SCAN);
1321
1322 /* we should have failed registration if scan_cmd was NULL */
1323 if (WARN_ON(!mvm->scan_cmd))
1324 return -ENOMEM;
1325
1326 if (!iwl_mvm_scan_fits(mvm, req->n_ssids, ies, req->n_channels))
1327 return -ENOBUFS;
1328
1329 params.n_ssids = req->n_ssids;
1330 params.flags = req->flags;
1331 params.n_channels = req->n_channels;
1332 params.delay = 0;
1333 params.interval = 0;
1334 params.ssids = req->ssids;
1335 params.channels = req->channels;
1336 params.mac_addr = req->mac_addr;
1337 params.mac_addr_mask = req->mac_addr_mask;
1338 params.no_cck = req->no_cck;
1339 params.pass_all = true;
1340 params.n_match_sets = 0;
1341 params.match_sets = NULL;
1342
1343 params.schedule[0].iterations = 1;
1344 params.schedule[0].full_scan_mul = 0;
1345 params.schedule[1].iterations = 0;
1346 params.schedule[1].full_scan_mul = 0;
1347
1348 iwl_mvm_scan_calc_dwell(mvm, vif, &params);
1349
1350 iwl_mvm_build_scan_probe(mvm, vif, ies, &params);
1351
1352 if (mvm->fw->ucode_capa.capa[0] & IWL_UCODE_TLV_CAPA_UMAC_SCAN) {
1353 hcmd.id = SCAN_REQ_UMAC;
1354 ret = iwl_mvm_scan_umac(mvm, vif, &params);
1355 } else {
1356 hcmd.id = SCAN_OFFLOAD_REQUEST_CMD;
1357 ret = iwl_mvm_scan_lmac(mvm, vif, &params);
1358 }
1359
1360 if (ret)
1361 return ret;
1362
1363 ret = iwl_mvm_send_cmd(mvm, &hcmd);
1364 if (!ret) {
1365 IWL_DEBUG_SCAN(mvm, "Scan request was sent successfully\n");
1366 mvm->scan_status |= IWL_MVM_SCAN_REGULAR;
1367 } else {
1368 /* If the scan failed, it usually means that the FW was unable
1369 * to allocate the time events. Warn on it, but maybe we
1370 * should try to send the command again with different params.
1371 */
1372 IWL_ERR(mvm, "Scan failed! ret %d\n", ret);
1373 }
1374
1375 if (ret)
1376 iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
1377
1378 return ret;
1379 }
1380
1381 int iwl_mvm_sched_scan_start(struct iwl_mvm *mvm,
1382 struct ieee80211_vif *vif,
1383 struct cfg80211_sched_scan_request *req,
1384 struct ieee80211_scan_ies *ies,
1385 int type)
1386 {
1387 struct iwl_host_cmd hcmd = {
1388 .len = { iwl_mvm_scan_size(mvm), },
1389 .data = { mvm->scan_cmd, },
1390 .dataflags = { IWL_HCMD_DFL_NOCOPY, },
1391 };
1392 struct iwl_mvm_scan_params params = {};
1393 int ret;
1394
1395 lockdep_assert_held(&mvm->mutex);
1396
1397 if (iwl_mvm_is_lar_supported(mvm) && !mvm->lar_regdom_set) {
1398 IWL_ERR(mvm, "sched-scan while LAR regdomain is not set\n");
1399 return -EBUSY;
1400 }
1401
1402 ret = iwl_mvm_check_running_scans(mvm, type);
1403 if (ret)
1404 return ret;
1405
1406 /* we should have failed registration if scan_cmd was NULL */
1407 if (WARN_ON(!mvm->scan_cmd))
1408 return -ENOMEM;
1409
1410 if (!iwl_mvm_scan_fits(mvm, req->n_ssids, ies, req->n_channels))
1411 return -ENOBUFS;
1412
1413 params.n_ssids = req->n_ssids;
1414 params.flags = req->flags;
1415 params.n_channels = req->n_channels;
1416 params.ssids = req->ssids;
1417 params.channels = req->channels;
1418 params.mac_addr = req->mac_addr;
1419 params.mac_addr_mask = req->mac_addr_mask;
1420 params.no_cck = false;
1421 params.pass_all = iwl_mvm_scan_pass_all(mvm, req);
1422 params.n_match_sets = req->n_match_sets;
1423 params.match_sets = req->match_sets;
1424
1425 params.schedule[0].iterations = IWL_FAST_SCHED_SCAN_ITERATIONS;
1426 params.schedule[0].full_scan_mul = 1;
1427 params.schedule[1].iterations = 0xff;
1428 params.schedule[1].full_scan_mul = IWL_FULL_SCAN_MULTIPLIER;
1429
1430 if (req->interval > U16_MAX) {
1431 IWL_DEBUG_SCAN(mvm,
1432 "interval value is > 16-bits, set to max possible\n");
1433 params.interval = U16_MAX;
1434 } else {
1435 params.interval = req->interval / MSEC_PER_SEC;
1436 }
1437
1438 /* In theory, LMAC scans can handle a 32-bit delay, but since
1439 * waiting for over 18 hours to start the scan is a bit silly
1440 * and to keep it aligned with UMAC scans (which only support
1441 * 16-bit delays), trim it down to 16-bits.
1442 */
1443 if (req->delay > U16_MAX) {
1444 IWL_DEBUG_SCAN(mvm,
1445 "delay value is > 16-bits, set to max possible\n");
1446 params.delay = U16_MAX;
1447 } else {
1448 params.delay = req->delay;
1449 }
1450
1451 iwl_mvm_scan_calc_dwell(mvm, vif, &params);
1452
1453 ret = iwl_mvm_config_sched_scan_profiles(mvm, req);
1454 if (ret)
1455 return ret;
1456
1457 iwl_mvm_build_scan_probe(mvm, vif, ies, &params);
1458
1459 if (mvm->fw->ucode_capa.capa[0] & IWL_UCODE_TLV_CAPA_UMAC_SCAN) {
1460 hcmd.id = SCAN_REQ_UMAC;
1461 ret = iwl_mvm_scan_umac(mvm, vif, &params);
1462 } else {
1463 hcmd.id = SCAN_OFFLOAD_REQUEST_CMD;
1464 ret = iwl_mvm_scan_lmac(mvm, vif, &params);
1465 }
1466
1467 if (ret)
1468 return ret;
1469
1470 ret = iwl_mvm_send_cmd(mvm, &hcmd);
1471 if (!ret) {
1472 IWL_DEBUG_SCAN(mvm,
1473 "Sched scan request was sent successfully\n");
1474 mvm->scan_status |= type;
1475 } else {
1476 /* If the scan failed, it usually means that the FW was unable
1477 * to allocate the time events. Warn on it, but maybe we
1478 * should try to send the command again with different params.
1479 */
1480 IWL_ERR(mvm, "Sched scan failed! ret %d\n", ret);
1481 }
1482
1483 return ret;
1484 }
1485
1486 int iwl_mvm_rx_umac_scan_complete_notif(struct iwl_mvm *mvm,
1487 struct iwl_rx_cmd_buffer *rxb,
1488 struct iwl_device_cmd *cmd)
1489 {
1490 struct iwl_rx_packet *pkt = rxb_addr(rxb);
1491 struct iwl_umac_scan_complete *notif = (void *)pkt->data;
1492 u32 uid = __le32_to_cpu(notif->uid);
1493 bool sched = !!(uid & IWL_MVM_SCAN_SCHED);
1494 int uid_idx = iwl_mvm_find_scan_uid(mvm, uid);
1495
1496 /*
1497 * Scan uid may be set to zero in case of scan abort request from above.
1498 */
1499 if (uid_idx >= mvm->max_scans)
1500 return 0;
1501
1502 IWL_DEBUG_SCAN(mvm,
1503 "Scan completed, uid %u type %s, status %s, EBS status %s\n",
1504 uid, sched ? "sched" : "regular",
1505 notif->status == IWL_SCAN_OFFLOAD_COMPLETED ?
1506 "completed" : "aborted",
1507 notif->ebs_status == IWL_SCAN_EBS_SUCCESS ?
1508 "success" : "failed");
1509
1510 if (notif->ebs_status)
1511 mvm->last_ebs_successful = false;
1512
1513 mvm->scan_uid[uid_idx] = 0;
1514
1515 if (!sched) {
1516 ieee80211_scan_completed(mvm->hw,
1517 notif->status ==
1518 IWL_SCAN_OFFLOAD_ABORTED);
1519 iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
1520 } else if (!iwl_mvm_find_scan_type(mvm, IWL_MVM_SCAN_SCHED)) {
1521 ieee80211_sched_scan_stopped(mvm->hw);
1522 } else {
1523 IWL_DEBUG_SCAN(mvm, "Another sched scan is running\n");
1524 }
1525
1526 return 0;
1527 }
1528
1529 int iwl_mvm_rx_umac_scan_iter_complete_notif(struct iwl_mvm *mvm,
1530 struct iwl_rx_cmd_buffer *rxb,
1531 struct iwl_device_cmd *cmd)
1532 {
1533 struct iwl_rx_packet *pkt = rxb_addr(rxb);
1534 struct iwl_umac_scan_iter_complete_notif *notif = (void *)pkt->data;
1535 u8 buf[256];
1536
1537 IWL_DEBUG_SCAN(mvm,
1538 "UMAC Scan iteration complete: status=0x%x scanned_channels=%d channels list: %s\n",
1539 notif->status, notif->scanned_channels,
1540 iwl_mvm_dump_channel_list(notif->results,
1541 notif->scanned_channels, buf,
1542 sizeof(buf)));
1543 return 0;
1544 }
1545
1546 static bool iwl_scan_umac_done_check(struct iwl_notif_wait_data *notif_wait,
1547 struct iwl_rx_packet *pkt, void *data)
1548 {
1549 struct iwl_umac_scan_done *scan_done = data;
1550 struct iwl_umac_scan_complete *notif = (void *)pkt->data;
1551 u32 uid = __le32_to_cpu(notif->uid);
1552 int uid_idx = iwl_mvm_find_scan_uid(scan_done->mvm, uid);
1553
1554 if (WARN_ON(pkt->hdr.cmd != SCAN_COMPLETE_UMAC))
1555 return false;
1556
1557 if (uid_idx >= scan_done->mvm->max_scans)
1558 return false;
1559
1560 /*
1561 * Clear scan uid of scans that was aborted from above and completed
1562 * in FW so the RX handler does nothing. Set last_ebs_successful here if
1563 * needed.
1564 */
1565 scan_done->mvm->scan_uid[uid_idx] = 0;
1566
1567 if (notif->ebs_status)
1568 scan_done->mvm->last_ebs_successful = false;
1569
1570 return !iwl_mvm_find_scan_type(scan_done->mvm, scan_done->type);
1571 }
1572
1573 static int iwl_umac_scan_abort_one(struct iwl_mvm *mvm, u32 uid)
1574 {
1575 struct iwl_umac_scan_abort cmd = {
1576 .hdr.size = cpu_to_le16(sizeof(struct iwl_umac_scan_abort) -
1577 sizeof(struct iwl_mvm_umac_cmd_hdr)),
1578 .uid = cpu_to_le32(uid),
1579 };
1580
1581 lockdep_assert_held(&mvm->mutex);
1582
1583 IWL_DEBUG_SCAN(mvm, "Sending scan abort, uid %u\n", uid);
1584
1585 return iwl_mvm_send_cmd_pdu(mvm, SCAN_ABORT_UMAC, 0, sizeof(cmd), &cmd);
1586 }
1587
1588 static int iwl_umac_scan_stop(struct iwl_mvm *mvm, int type, bool notify)
1589 {
1590 struct iwl_notification_wait wait_scan_done;
1591 static const u8 scan_done_notif[] = { SCAN_COMPLETE_UMAC, };
1592 struct iwl_umac_scan_done scan_done = {
1593 .mvm = mvm,
1594 .type = type,
1595 };
1596 int i, ret = -EIO;
1597
1598 iwl_init_notification_wait(&mvm->notif_wait, &wait_scan_done,
1599 scan_done_notif,
1600 ARRAY_SIZE(scan_done_notif),
1601 iwl_scan_umac_done_check, &scan_done);
1602
1603 IWL_DEBUG_SCAN(mvm, "Preparing to stop scan, type %x\n", type);
1604
1605 for (i = 0; i < mvm->max_scans; i++) {
1606 if (mvm->scan_uid[i] & type) {
1607 int err;
1608
1609 if (iwl_mvm_is_radio_killed(mvm) &&
1610 (type & IWL_MVM_SCAN_REGULAR)) {
1611 ieee80211_scan_completed(mvm->hw, true);
1612 iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
1613 break;
1614 }
1615
1616 err = iwl_umac_scan_abort_one(mvm, mvm->scan_uid[i]);
1617 if (!err)
1618 ret = 0;
1619 }
1620 }
1621
1622 if (ret) {
1623 IWL_DEBUG_SCAN(mvm, "Couldn't stop scan\n");
1624 iwl_remove_notification(&mvm->notif_wait, &wait_scan_done);
1625 return ret;
1626 }
1627
1628 ret = iwl_wait_notification(&mvm->notif_wait, &wait_scan_done, 1 * HZ);
1629 if (ret)
1630 return ret;
1631
1632 if (notify) {
1633 if (type & IWL_MVM_SCAN_SCHED)
1634 ieee80211_sched_scan_stopped(mvm->hw);
1635 if (type & IWL_MVM_SCAN_REGULAR) {
1636 ieee80211_scan_completed(mvm->hw, true);
1637 iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
1638 }
1639 }
1640
1641 return ret;
1642 }
1643
1644 int iwl_mvm_scan_size(struct iwl_mvm *mvm)
1645 {
1646 if (mvm->fw->ucode_capa.capa[0] & IWL_UCODE_TLV_CAPA_UMAC_SCAN)
1647 return sizeof(struct iwl_scan_req_umac) +
1648 sizeof(struct iwl_scan_channel_cfg_umac) *
1649 mvm->fw->ucode_capa.n_scan_channels +
1650 sizeof(struct iwl_scan_req_umac_tail);
1651
1652 return sizeof(struct iwl_scan_req_lmac) +
1653 sizeof(struct iwl_scan_channel_cfg_lmac) *
1654 mvm->fw->ucode_capa.n_scan_channels +
1655 sizeof(struct iwl_scan_probe_req);
1656 }
1657
1658 /*
1659 * This function is used in nic restart flow, to inform mac80211 about scans
1660 * that was aborted by restart flow or by an assert.
1661 */
1662 void iwl_mvm_report_scan_aborted(struct iwl_mvm *mvm)
1663 {
1664 if (mvm->fw->ucode_capa.capa[0] & IWL_UCODE_TLV_CAPA_UMAC_SCAN) {
1665 u32 uid, i;
1666
1667 uid = iwl_mvm_find_first_scan(mvm, IWL_MVM_SCAN_REGULAR);
1668 if (uid < mvm->max_scans) {
1669 ieee80211_scan_completed(mvm->hw, true);
1670 mvm->scan_uid[uid] = 0;
1671 }
1672 uid = iwl_mvm_find_first_scan(mvm, IWL_MVM_SCAN_SCHED);
1673 if (uid < mvm->max_scans && !mvm->restart_fw) {
1674 ieee80211_sched_scan_stopped(mvm->hw);
1675 mvm->scan_uid[uid] = 0;
1676 }
1677
1678 /* We shouldn't have any UIDs still set. Loop over all the
1679 * UIDs to make sure there's nothing left there and warn if
1680 * any is found.
1681 */
1682 for (i = 0; i < mvm->max_scans; i++) {
1683 if (WARN_ONCE(mvm->scan_uid[i],
1684 "UMAC scan UID %d was not cleaned\n",
1685 mvm->scan_uid[i]))
1686 mvm->scan_uid[i] = 0;
1687 }
1688 } else {
1689 if (mvm->scan_status & IWL_MVM_SCAN_REGULAR)
1690 ieee80211_scan_completed(mvm->hw, true);
1691
1692 /* Sched scan will be restarted by mac80211 in
1693 * restart_hw, so do not report if FW is about to be
1694 * restarted.
1695 */
1696 if ((mvm->scan_status & IWL_MVM_SCAN_SCHED) && !mvm->restart_fw)
1697 ieee80211_sched_scan_stopped(mvm->hw);
1698 }
1699 }
Linux kernel - Deliverables
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