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[deliverable/linux.git] / drivers / net / wireless / intel / 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.
5 *
6 * GPL LICENSE SUMMARY
7 *
8 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
9 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of version 2 of the GNU General Public License as
13 * published by the Free Software Foundation.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
23 * USA
24 *
25 * The full GNU General Public License is included in this distribution
26 * in the file called COPYING.
27 *
28 * Contact Information:
29 * Intel Linux Wireless <ilw@linux.intel.com>
30 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
31 *
32 * BSD LICENSE
33 *
34 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
35 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
36 * All rights reserved.
37 *
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
40 * are met:
41 *
42 * * Redistributions of source code must retain the above copyright
43 * notice, this list of conditions and the following disclaimer.
44 * * Redistributions in binary form must reproduce the above copyright
45 * notice, this list of conditions and the following disclaimer in
46 * the documentation and/or other materials provided with the
47 * distribution.
48 * * Neither the name Intel Corporation nor the names of its
49 * contributors may be used to endorse or promote products derived
50 * from this software without specific prior written permission.
51 *
52 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
53 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
54 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
55 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
56 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
57 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
58 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
59 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
60 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
61 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
62 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
63 *
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 enum iwl_mvm_scan_type {
76 IWL_SCAN_TYPE_UNASSOC,
77 IWL_SCAN_TYPE_WILD,
78 IWL_SCAN_TYPE_MILD,
79 IWL_SCAN_TYPE_FRAGMENTED,
80 };
81
82 enum iwl_mvm_traffic_load {
83 IWL_MVM_TRAFFIC_LOW,
84 IWL_MVM_TRAFFIC_MEDIUM,
85 IWL_MVM_TRAFFIC_HIGH,
86 };
87
88 struct iwl_mvm_scan_timing_params {
89 u32 dwell_active;
90 u32 dwell_passive;
91 u32 dwell_fragmented;
92 u32 suspend_time;
93 u32 max_out_time;
94 };
95
96 static struct iwl_mvm_scan_timing_params scan_timing[] = {
97 [IWL_SCAN_TYPE_UNASSOC] = {
98 .dwell_active = 10,
99 .dwell_passive = 110,
100 .dwell_fragmented = 44,
101 .suspend_time = 0,
102 .max_out_time = 0,
103 },
104 [IWL_SCAN_TYPE_WILD] = {
105 .dwell_active = 10,
106 .dwell_passive = 110,
107 .dwell_fragmented = 44,
108 .suspend_time = 30,
109 .max_out_time = 120,
110 },
111 [IWL_SCAN_TYPE_MILD] = {
112 .dwell_active = 10,
113 .dwell_passive = 110,
114 .dwell_fragmented = 44,
115 .suspend_time = 120,
116 .max_out_time = 120,
117 },
118 [IWL_SCAN_TYPE_FRAGMENTED] = {
119 .dwell_active = 10,
120 .dwell_passive = 110,
121 .dwell_fragmented = 44,
122 .suspend_time = 95,
123 .max_out_time = 44,
124 },
125 };
126
127 struct iwl_mvm_scan_params {
128 enum iwl_mvm_scan_type type;
129 u32 n_channels;
130 u16 delay;
131 int n_ssids;
132 struct cfg80211_ssid *ssids;
133 struct ieee80211_channel **channels;
134 u32 flags;
135 u8 *mac_addr;
136 u8 *mac_addr_mask;
137 bool no_cck;
138 bool pass_all;
139 int n_match_sets;
140 struct iwl_scan_probe_req preq;
141 struct cfg80211_match_set *match_sets;
142 int n_scan_plans;
143 struct cfg80211_sched_scan_plan *scan_plans;
144 };
145
146 static u8 iwl_mvm_scan_rx_ant(struct iwl_mvm *mvm)
147 {
148 if (mvm->scan_rx_ant != ANT_NONE)
149 return mvm->scan_rx_ant;
150 return iwl_mvm_get_valid_rx_ant(mvm);
151 }
152
153 static inline __le16 iwl_mvm_scan_rx_chain(struct iwl_mvm *mvm)
154 {
155 u16 rx_chain;
156 u8 rx_ant;
157
158 rx_ant = iwl_mvm_scan_rx_ant(mvm);
159 rx_chain = rx_ant << PHY_RX_CHAIN_VALID_POS;
160 rx_chain |= rx_ant << PHY_RX_CHAIN_FORCE_MIMO_SEL_POS;
161 rx_chain |= rx_ant << PHY_RX_CHAIN_FORCE_SEL_POS;
162 rx_chain |= 0x1 << PHY_RX_CHAIN_DRIVER_FORCE_POS;
163 return cpu_to_le16(rx_chain);
164 }
165
166 static __le32 iwl_mvm_scan_rxon_flags(enum ieee80211_band band)
167 {
168 if (band == IEEE80211_BAND_2GHZ)
169 return cpu_to_le32(PHY_BAND_24);
170 else
171 return cpu_to_le32(PHY_BAND_5);
172 }
173
174 static inline __le32
175 iwl_mvm_scan_rate_n_flags(struct iwl_mvm *mvm, enum ieee80211_band band,
176 bool no_cck)
177 {
178 u32 tx_ant;
179
180 mvm->scan_last_antenna_idx =
181 iwl_mvm_next_antenna(mvm, iwl_mvm_get_valid_tx_ant(mvm),
182 mvm->scan_last_antenna_idx);
183 tx_ant = BIT(mvm->scan_last_antenna_idx) << RATE_MCS_ANT_POS;
184
185 if (band == IEEE80211_BAND_2GHZ && !no_cck)
186 return cpu_to_le32(IWL_RATE_1M_PLCP | RATE_MCS_CCK_MSK |
187 tx_ant);
188 else
189 return cpu_to_le32(IWL_RATE_6M_PLCP | tx_ant);
190 }
191
192 static void iwl_mvm_scan_condition_iterator(void *data, u8 *mac,
193 struct ieee80211_vif *vif)
194 {
195 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
196 int *global_cnt = data;
197
198 if (vif->type != NL80211_IFTYPE_P2P_DEVICE && mvmvif->phy_ctxt &&
199 mvmvif->phy_ctxt->id < MAX_PHYS)
200 *global_cnt += 1;
201 }
202
203 static enum iwl_mvm_traffic_load iwl_mvm_get_traffic_load(struct iwl_mvm *mvm)
204 {
205 return IWL_MVM_TRAFFIC_LOW;
206 }
207
208 static enum
209 iwl_mvm_scan_type iwl_mvm_get_scan_type(struct iwl_mvm *mvm,
210 struct ieee80211_vif *vif,
211 struct iwl_mvm_scan_params *params)
212 {
213 int global_cnt = 0;
214 enum iwl_mvm_traffic_load load;
215 bool low_latency;
216
217 ieee80211_iterate_active_interfaces_atomic(mvm->hw,
218 IEEE80211_IFACE_ITER_NORMAL,
219 iwl_mvm_scan_condition_iterator,
220 &global_cnt);
221 if (!global_cnt)
222 return IWL_SCAN_TYPE_UNASSOC;
223
224 load = iwl_mvm_get_traffic_load(mvm);
225 low_latency = iwl_mvm_low_latency(mvm);
226
227 if ((load == IWL_MVM_TRAFFIC_HIGH || low_latency) &&
228 vif->type != NL80211_IFTYPE_P2P_DEVICE &&
229 fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_FRAGMENTED_SCAN))
230 return IWL_SCAN_TYPE_FRAGMENTED;
231
232 if (load >= IWL_MVM_TRAFFIC_MEDIUM || low_latency)
233 return IWL_SCAN_TYPE_MILD;
234
235 return IWL_SCAN_TYPE_WILD;
236 }
237
238 static inline bool iwl_mvm_rrm_scan_needed(struct iwl_mvm *mvm)
239 {
240 /* require rrm scan whenever the fw supports it */
241 return fw_has_capa(&mvm->fw->ucode_capa,
242 IWL_UCODE_TLV_CAPA_DS_PARAM_SET_IE_SUPPORT);
243 }
244
245 static int iwl_mvm_max_scan_ie_fw_cmd_room(struct iwl_mvm *mvm)
246 {
247 int max_probe_len;
248
249 max_probe_len = SCAN_OFFLOAD_PROBE_REQ_SIZE;
250
251 /* we create the 802.11 header and SSID element */
252 max_probe_len -= 24 + 2;
253
254 /* DS parameter set element is added on 2.4GHZ band if required */
255 if (iwl_mvm_rrm_scan_needed(mvm))
256 max_probe_len -= 3;
257
258 return max_probe_len;
259 }
260
261 int iwl_mvm_max_scan_ie_len(struct iwl_mvm *mvm)
262 {
263 int max_ie_len = iwl_mvm_max_scan_ie_fw_cmd_room(mvm);
264
265 /* TODO: [BUG] This function should return the maximum allowed size of
266 * scan IEs, however the LMAC scan api contains both 2GHZ and 5GHZ IEs
267 * in the same command. So the correct implementation of this function
268 * is just iwl_mvm_max_scan_ie_fw_cmd_room() / 2. Currently the scan
269 * command has only 512 bytes and it would leave us with about 240
270 * bytes for scan IEs, which is clearly not enough. So meanwhile
271 * we will report an incorrect value. This may result in a failure to
272 * issue a scan in unified_scan_lmac and unified_sched_scan_lmac
273 * functions with -ENOBUFS, if a large enough probe will be provided.
274 */
275 return max_ie_len;
276 }
277
278 static u8 *iwl_mvm_dump_channel_list(struct iwl_scan_results_notif *res,
279 int num_res, u8 *buf, size_t buf_size)
280 {
281 int i;
282 u8 *pos = buf, *end = buf + buf_size;
283
284 for (i = 0; pos < end && i < num_res; i++)
285 pos += snprintf(pos, end - pos, " %u", res[i].channel);
286
287 /* terminate the string in case the buffer was too short */
288 *(buf + buf_size - 1) = '\0';
289
290 return buf;
291 }
292
293 void iwl_mvm_rx_lmac_scan_iter_complete_notif(struct iwl_mvm *mvm,
294 struct iwl_rx_cmd_buffer *rxb)
295 {
296 struct iwl_rx_packet *pkt = rxb_addr(rxb);
297 struct iwl_lmac_scan_complete_notif *notif = (void *)pkt->data;
298 u8 buf[256];
299
300 IWL_DEBUG_SCAN(mvm,
301 "Scan offload iteration complete: status=0x%x scanned channels=%d channels list: %s\n",
302 notif->status, notif->scanned_channels,
303 iwl_mvm_dump_channel_list(notif->results,
304 notif->scanned_channels, buf,
305 sizeof(buf)));
306 }
307
308 void iwl_mvm_rx_scan_match_found(struct iwl_mvm *mvm,
309 struct iwl_rx_cmd_buffer *rxb)
310 {
311 IWL_DEBUG_SCAN(mvm, "Scheduled scan results\n");
312 ieee80211_sched_scan_results(mvm->hw);
313 }
314
315 static const char *iwl_mvm_ebs_status_str(enum iwl_scan_ebs_status status)
316 {
317 switch (status) {
318 case IWL_SCAN_EBS_SUCCESS:
319 return "successful";
320 case IWL_SCAN_EBS_INACTIVE:
321 return "inactive";
322 case IWL_SCAN_EBS_FAILED:
323 case IWL_SCAN_EBS_CHAN_NOT_FOUND:
324 default:
325 return "failed";
326 }
327 }
328
329 void iwl_mvm_rx_lmac_scan_complete_notif(struct iwl_mvm *mvm,
330 struct iwl_rx_cmd_buffer *rxb)
331 {
332 struct iwl_rx_packet *pkt = rxb_addr(rxb);
333 struct iwl_periodic_scan_complete *scan_notif = (void *)pkt->data;
334 bool aborted = (scan_notif->status == IWL_SCAN_OFFLOAD_ABORTED);
335
336 /* If this happens, the firmware has mistakenly sent an LMAC
337 * notification during UMAC scans -- warn and ignore it.
338 */
339 if (WARN_ON_ONCE(fw_has_capa(&mvm->fw->ucode_capa,
340 IWL_UCODE_TLV_CAPA_UMAC_SCAN)))
341 return;
342
343 /* scan status must be locked for proper checking */
344 lockdep_assert_held(&mvm->mutex);
345
346 /* We first check if we were stopping a scan, in which case we
347 * just clear the stopping flag. Then we check if it was a
348 * firmware initiated stop, in which case we need to inform
349 * mac80211.
350 * Note that we can have a stopping and a running scan
351 * simultaneously, but we can't have two different types of
352 * scans stopping or running at the same time (since LMAC
353 * doesn't support it).
354 */
355
356 if (mvm->scan_status & IWL_MVM_SCAN_STOPPING_SCHED) {
357 WARN_ON_ONCE(mvm->scan_status & IWL_MVM_SCAN_STOPPING_REGULAR);
358
359 IWL_DEBUG_SCAN(mvm, "Scheduled scan %s, EBS status %s\n",
360 aborted ? "aborted" : "completed",
361 iwl_mvm_ebs_status_str(scan_notif->ebs_status));
362 IWL_DEBUG_SCAN(mvm,
363 "Last line %d, Last iteration %d, Time after last iteration %d\n",
364 scan_notif->last_schedule_line,
365 scan_notif->last_schedule_iteration,
366 __le32_to_cpu(scan_notif->time_after_last_iter));
367
368 mvm->scan_status &= ~IWL_MVM_SCAN_STOPPING_SCHED;
369 } else if (mvm->scan_status & IWL_MVM_SCAN_STOPPING_REGULAR) {
370 IWL_DEBUG_SCAN(mvm, "Regular scan %s, EBS status %s\n",
371 aborted ? "aborted" : "completed",
372 iwl_mvm_ebs_status_str(scan_notif->ebs_status));
373
374 mvm->scan_status &= ~IWL_MVM_SCAN_STOPPING_REGULAR;
375 } else if (mvm->scan_status & IWL_MVM_SCAN_SCHED) {
376 WARN_ON_ONCE(mvm->scan_status & IWL_MVM_SCAN_REGULAR);
377
378 IWL_DEBUG_SCAN(mvm, "Scheduled scan %s, EBS status %s\n",
379 aborted ? "aborted" : "completed",
380 iwl_mvm_ebs_status_str(scan_notif->ebs_status));
381 IWL_DEBUG_SCAN(mvm,
382 "Last line %d, Last iteration %d, Time after last iteration %d (FW)\n",
383 scan_notif->last_schedule_line,
384 scan_notif->last_schedule_iteration,
385 __le32_to_cpu(scan_notif->time_after_last_iter));
386
387 mvm->scan_status &= ~IWL_MVM_SCAN_SCHED;
388 ieee80211_sched_scan_stopped(mvm->hw);
389 } else if (mvm->scan_status & IWL_MVM_SCAN_REGULAR) {
390 IWL_DEBUG_SCAN(mvm, "Regular scan %s, EBS status %s (FW)\n",
391 aborted ? "aborted" : "completed",
392 iwl_mvm_ebs_status_str(scan_notif->ebs_status));
393
394 mvm->scan_status &= ~IWL_MVM_SCAN_REGULAR;
395 ieee80211_scan_completed(mvm->hw,
396 scan_notif->status == IWL_SCAN_OFFLOAD_ABORTED);
397 iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
398 }
399
400 mvm->last_ebs_successful =
401 scan_notif->ebs_status == IWL_SCAN_EBS_SUCCESS ||
402 scan_notif->ebs_status == IWL_SCAN_EBS_INACTIVE;
403 }
404
405 static int iwl_ssid_exist(u8 *ssid, u8 ssid_len, struct iwl_ssid_ie *ssid_list)
406 {
407 int i;
408
409 for (i = 0; i < PROBE_OPTION_MAX; i++) {
410 if (!ssid_list[i].len)
411 break;
412 if (ssid_list[i].len == ssid_len &&
413 !memcmp(ssid_list->ssid, ssid, ssid_len))
414 return i;
415 }
416 return -1;
417 }
418
419 /* We insert the SSIDs in an inverted order, because the FW will
420 * invert it back.
421 */
422 static void iwl_scan_build_ssids(struct iwl_mvm_scan_params *params,
423 struct iwl_ssid_ie *ssids,
424 u32 *ssid_bitmap)
425 {
426 int i, j;
427 int index;
428
429 /*
430 * copy SSIDs from match list.
431 * iwl_config_sched_scan_profiles() uses the order of these ssids to
432 * config match list.
433 */
434 for (i = 0, j = params->n_match_sets - 1;
435 j >= 0 && i < PROBE_OPTION_MAX;
436 i++, j--) {
437 /* skip empty SSID matchsets */
438 if (!params->match_sets[j].ssid.ssid_len)
439 continue;
440 ssids[i].id = WLAN_EID_SSID;
441 ssids[i].len = params->match_sets[j].ssid.ssid_len;
442 memcpy(ssids[i].ssid, params->match_sets[j].ssid.ssid,
443 ssids[i].len);
444 }
445
446 /* add SSIDs from scan SSID list */
447 *ssid_bitmap = 0;
448 for (j = params->n_ssids - 1;
449 j >= 0 && i < PROBE_OPTION_MAX;
450 i++, j--) {
451 index = iwl_ssid_exist(params->ssids[j].ssid,
452 params->ssids[j].ssid_len,
453 ssids);
454 if (index < 0) {
455 ssids[i].id = WLAN_EID_SSID;
456 ssids[i].len = params->ssids[j].ssid_len;
457 memcpy(ssids[i].ssid, params->ssids[j].ssid,
458 ssids[i].len);
459 *ssid_bitmap |= BIT(i);
460 } else {
461 *ssid_bitmap |= BIT(index);
462 }
463 }
464 }
465
466 static int
467 iwl_mvm_config_sched_scan_profiles(struct iwl_mvm *mvm,
468 struct cfg80211_sched_scan_request *req)
469 {
470 struct iwl_scan_offload_profile *profile;
471 struct iwl_scan_offload_profile_cfg *profile_cfg;
472 struct iwl_scan_offload_blacklist *blacklist;
473 struct iwl_host_cmd cmd = {
474 .id = SCAN_OFFLOAD_UPDATE_PROFILES_CMD,
475 .len[1] = sizeof(*profile_cfg),
476 .dataflags[0] = IWL_HCMD_DFL_NOCOPY,
477 .dataflags[1] = IWL_HCMD_DFL_NOCOPY,
478 };
479 int blacklist_len;
480 int i;
481 int ret;
482
483 if (WARN_ON(req->n_match_sets > IWL_SCAN_MAX_PROFILES))
484 return -EIO;
485
486 if (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_SHORT_BL)
487 blacklist_len = IWL_SCAN_SHORT_BLACKLIST_LEN;
488 else
489 blacklist_len = IWL_SCAN_MAX_BLACKLIST_LEN;
490
491 blacklist = kzalloc(sizeof(*blacklist) * blacklist_len, GFP_KERNEL);
492 if (!blacklist)
493 return -ENOMEM;
494
495 profile_cfg = kzalloc(sizeof(*profile_cfg), GFP_KERNEL);
496 if (!profile_cfg) {
497 ret = -ENOMEM;
498 goto free_blacklist;
499 }
500
501 cmd.data[0] = blacklist;
502 cmd.len[0] = sizeof(*blacklist) * blacklist_len;
503 cmd.data[1] = profile_cfg;
504
505 /* No blacklist configuration */
506
507 profile_cfg->num_profiles = req->n_match_sets;
508 profile_cfg->active_clients = SCAN_CLIENT_SCHED_SCAN;
509 profile_cfg->pass_match = SCAN_CLIENT_SCHED_SCAN;
510 profile_cfg->match_notify = SCAN_CLIENT_SCHED_SCAN;
511 if (!req->n_match_sets || !req->match_sets[0].ssid.ssid_len)
512 profile_cfg->any_beacon_notify = SCAN_CLIENT_SCHED_SCAN;
513
514 for (i = 0; i < req->n_match_sets; i++) {
515 profile = &profile_cfg->profiles[i];
516 profile->ssid_index = i;
517 /* Support any cipher and auth algorithm */
518 profile->unicast_cipher = 0xff;
519 profile->auth_alg = 0xff;
520 profile->network_type = IWL_NETWORK_TYPE_ANY;
521 profile->band_selection = IWL_SCAN_OFFLOAD_SELECT_ANY;
522 profile->client_bitmap = SCAN_CLIENT_SCHED_SCAN;
523 }
524
525 IWL_DEBUG_SCAN(mvm, "Sending scheduled scan profile config\n");
526
527 ret = iwl_mvm_send_cmd(mvm, &cmd);
528 kfree(profile_cfg);
529 free_blacklist:
530 kfree(blacklist);
531
532 return ret;
533 }
534
535 static bool iwl_mvm_scan_pass_all(struct iwl_mvm *mvm,
536 struct cfg80211_sched_scan_request *req)
537 {
538 if (req->n_match_sets && req->match_sets[0].ssid.ssid_len) {
539 IWL_DEBUG_SCAN(mvm,
540 "Sending scheduled scan with filtering, n_match_sets %d\n",
541 req->n_match_sets);
542 return false;
543 }
544
545 IWL_DEBUG_SCAN(mvm, "Sending Scheduled scan without filtering\n");
546 return true;
547 }
548
549 static int iwl_mvm_lmac_scan_abort(struct iwl_mvm *mvm)
550 {
551 int ret;
552 struct iwl_host_cmd cmd = {
553 .id = SCAN_OFFLOAD_ABORT_CMD,
554 };
555 u32 status;
556
557 ret = iwl_mvm_send_cmd_status(mvm, &cmd, &status);
558 if (ret)
559 return ret;
560
561 if (status != CAN_ABORT_STATUS) {
562 /*
563 * The scan abort will return 1 for success or
564 * 2 for "failure". A failure condition can be
565 * due to simply not being in an active scan which
566 * can occur if we send the scan abort before the
567 * microcode has notified us that a scan is completed.
568 */
569 IWL_DEBUG_SCAN(mvm, "SCAN OFFLOAD ABORT ret %d.\n", status);
570 ret = -ENOENT;
571 }
572
573 return ret;
574 }
575
576 static void iwl_mvm_scan_fill_tx_cmd(struct iwl_mvm *mvm,
577 struct iwl_scan_req_tx_cmd *tx_cmd,
578 bool no_cck)
579 {
580 tx_cmd[0].tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL |
581 TX_CMD_FLG_BT_DIS);
582 tx_cmd[0].rate_n_flags = iwl_mvm_scan_rate_n_flags(mvm,
583 IEEE80211_BAND_2GHZ,
584 no_cck);
585 tx_cmd[0].sta_id = mvm->aux_sta.sta_id;
586
587 tx_cmd[1].tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL |
588 TX_CMD_FLG_BT_DIS);
589 tx_cmd[1].rate_n_flags = iwl_mvm_scan_rate_n_flags(mvm,
590 IEEE80211_BAND_5GHZ,
591 no_cck);
592 tx_cmd[1].sta_id = mvm->aux_sta.sta_id;
593 }
594
595 static void
596 iwl_mvm_lmac_scan_cfg_channels(struct iwl_mvm *mvm,
597 struct ieee80211_channel **channels,
598 int n_channels, u32 ssid_bitmap,
599 struct iwl_scan_req_lmac *cmd)
600 {
601 struct iwl_scan_channel_cfg_lmac *channel_cfg = (void *)&cmd->data;
602 int i;
603
604 for (i = 0; i < n_channels; i++) {
605 channel_cfg[i].channel_num =
606 cpu_to_le16(channels[i]->hw_value);
607 channel_cfg[i].iter_count = cpu_to_le16(1);
608 channel_cfg[i].iter_interval = 0;
609 channel_cfg[i].flags =
610 cpu_to_le32(IWL_UNIFIED_SCAN_CHANNEL_PARTIAL |
611 ssid_bitmap);
612 }
613 }
614
615 static u8 *iwl_mvm_copy_and_insert_ds_elem(struct iwl_mvm *mvm, const u8 *ies,
616 size_t len, u8 *const pos)
617 {
618 static const u8 before_ds_params[] = {
619 WLAN_EID_SSID,
620 WLAN_EID_SUPP_RATES,
621 WLAN_EID_REQUEST,
622 WLAN_EID_EXT_SUPP_RATES,
623 };
624 size_t offs;
625 u8 *newpos = pos;
626
627 if (!iwl_mvm_rrm_scan_needed(mvm)) {
628 memcpy(newpos, ies, len);
629 return newpos + len;
630 }
631
632 offs = ieee80211_ie_split(ies, len,
633 before_ds_params,
634 ARRAY_SIZE(before_ds_params),
635 0);
636
637 memcpy(newpos, ies, offs);
638 newpos += offs;
639
640 /* Add a placeholder for DS Parameter Set element */
641 *newpos++ = WLAN_EID_DS_PARAMS;
642 *newpos++ = 1;
643 *newpos++ = 0;
644
645 memcpy(newpos, ies + offs, len - offs);
646 newpos += len - offs;
647
648 return newpos;
649 }
650
651 static void
652 iwl_mvm_build_scan_probe(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
653 struct ieee80211_scan_ies *ies,
654 struct iwl_mvm_scan_params *params)
655 {
656 struct ieee80211_mgmt *frame = (void *)params->preq.buf;
657 u8 *pos, *newpos;
658 const u8 *mac_addr = params->flags & NL80211_SCAN_FLAG_RANDOM_ADDR ?
659 params->mac_addr : NULL;
660
661 /*
662 * Unfortunately, right now the offload scan doesn't support randomising
663 * within the firmware, so until the firmware API is ready we implement
664 * it in the driver. This means that the scan iterations won't really be
665 * random, only when it's restarted, but at least that helps a bit.
666 */
667 if (mac_addr)
668 get_random_mask_addr(frame->sa, mac_addr,
669 params->mac_addr_mask);
670 else
671 memcpy(frame->sa, vif->addr, ETH_ALEN);
672
673 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
674 eth_broadcast_addr(frame->da);
675 eth_broadcast_addr(frame->bssid);
676 frame->seq_ctrl = 0;
677
678 pos = frame->u.probe_req.variable;
679 *pos++ = WLAN_EID_SSID;
680 *pos++ = 0;
681
682 params->preq.mac_header.offset = 0;
683 params->preq.mac_header.len = cpu_to_le16(24 + 2);
684
685 /* Insert ds parameter set element on 2.4 GHz band */
686 newpos = iwl_mvm_copy_and_insert_ds_elem(mvm,
687 ies->ies[IEEE80211_BAND_2GHZ],
688 ies->len[IEEE80211_BAND_2GHZ],
689 pos);
690 params->preq.band_data[0].offset = cpu_to_le16(pos - params->preq.buf);
691 params->preq.band_data[0].len = cpu_to_le16(newpos - pos);
692 pos = newpos;
693
694 memcpy(pos, ies->ies[IEEE80211_BAND_5GHZ],
695 ies->len[IEEE80211_BAND_5GHZ]);
696 params->preq.band_data[1].offset = cpu_to_le16(pos - params->preq.buf);
697 params->preq.band_data[1].len =
698 cpu_to_le16(ies->len[IEEE80211_BAND_5GHZ]);
699 pos += ies->len[IEEE80211_BAND_5GHZ];
700
701 memcpy(pos, ies->common_ies, ies->common_ie_len);
702 params->preq.common_data.offset = cpu_to_le16(pos - params->preq.buf);
703 params->preq.common_data.len = cpu_to_le16(ies->common_ie_len);
704 }
705
706 static __le32 iwl_mvm_scan_priority(struct iwl_mvm *mvm,
707 enum iwl_scan_priority_ext prio)
708 {
709 if (fw_has_api(&mvm->fw->ucode_capa,
710 IWL_UCODE_TLV_API_EXT_SCAN_PRIORITY))
711 return cpu_to_le32(prio);
712
713 if (prio <= IWL_SCAN_PRIORITY_EXT_2)
714 return cpu_to_le32(IWL_SCAN_PRIORITY_LOW);
715
716 if (prio <= IWL_SCAN_PRIORITY_EXT_4)
717 return cpu_to_le32(IWL_SCAN_PRIORITY_MEDIUM);
718
719 return cpu_to_le32(IWL_SCAN_PRIORITY_HIGH);
720 }
721
722 static void iwl_mvm_scan_lmac_dwell(struct iwl_mvm *mvm,
723 struct iwl_scan_req_lmac *cmd,
724 struct iwl_mvm_scan_params *params)
725 {
726 cmd->active_dwell = scan_timing[params->type].dwell_active;
727 cmd->passive_dwell = scan_timing[params->type].dwell_passive;
728 cmd->fragmented_dwell = scan_timing[params->type].dwell_fragmented;
729 cmd->max_out_time = cpu_to_le32(scan_timing[params->type].max_out_time);
730 cmd->suspend_time = cpu_to_le32(scan_timing[params->type].suspend_time);
731 cmd->scan_prio = iwl_mvm_scan_priority(mvm, IWL_SCAN_PRIORITY_EXT_6);
732 }
733
734 static inline bool iwl_mvm_scan_fits(struct iwl_mvm *mvm, int n_ssids,
735 struct ieee80211_scan_ies *ies,
736 int n_channels)
737 {
738 return ((n_ssids <= PROBE_OPTION_MAX) &&
739 (n_channels <= mvm->fw->ucode_capa.n_scan_channels) &
740 (ies->common_ie_len +
741 ies->len[NL80211_BAND_2GHZ] +
742 ies->len[NL80211_BAND_5GHZ] <=
743 iwl_mvm_max_scan_ie_fw_cmd_room(mvm)));
744 }
745
746 static inline bool iwl_mvm_scan_use_ebs(struct iwl_mvm *mvm,
747 struct ieee80211_vif *vif)
748 {
749 const struct iwl_ucode_capabilities *capa = &mvm->fw->ucode_capa;
750
751 /* We can only use EBS if:
752 * 1. the feature is supported;
753 * 2. the last EBS was successful;
754 * 3. if only single scan, the single scan EBS API is supported;
755 * 4. it's not a p2p find operation.
756 */
757 return ((capa->flags & IWL_UCODE_TLV_FLAGS_EBS_SUPPORT) &&
758 mvm->last_ebs_successful &&
759 vif->type != NL80211_IFTYPE_P2P_DEVICE);
760 }
761
762 static int iwl_mvm_scan_lmac_flags(struct iwl_mvm *mvm,
763 struct iwl_mvm_scan_params *params)
764 {
765 int flags = 0;
766
767 if (params->n_ssids == 0)
768 flags |= IWL_MVM_LMAC_SCAN_FLAG_PASSIVE;
769
770 if (params->n_ssids == 1 && params->ssids[0].ssid_len != 0)
771 flags |= IWL_MVM_LMAC_SCAN_FLAG_PRE_CONNECTION;
772
773 if (params->type == IWL_SCAN_TYPE_FRAGMENTED)
774 flags |= IWL_MVM_LMAC_SCAN_FLAG_FRAGMENTED;
775
776 if (iwl_mvm_rrm_scan_needed(mvm))
777 flags |= IWL_MVM_LMAC_SCAN_FLAGS_RRM_ENABLED;
778
779 if (params->pass_all)
780 flags |= IWL_MVM_LMAC_SCAN_FLAG_PASS_ALL;
781 else
782 flags |= IWL_MVM_LMAC_SCAN_FLAG_MATCH;
783
784 #ifdef CONFIG_IWLWIFI_DEBUGFS
785 if (mvm->scan_iter_notif_enabled)
786 flags |= IWL_MVM_LMAC_SCAN_FLAG_ITER_COMPLETE;
787 #endif
788
789 return flags;
790 }
791
792 static int iwl_mvm_scan_lmac(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
793 struct iwl_mvm_scan_params *params)
794 {
795 struct iwl_scan_req_lmac *cmd = mvm->scan_cmd;
796 struct iwl_scan_probe_req *preq =
797 (void *)(cmd->data + sizeof(struct iwl_scan_channel_cfg_lmac) *
798 mvm->fw->ucode_capa.n_scan_channels);
799 u32 ssid_bitmap = 0;
800 int i;
801
802 lockdep_assert_held(&mvm->mutex);
803
804 memset(cmd, 0, ksize(cmd));
805
806 if (WARN_ON(params->n_scan_plans > IWL_MAX_SCHED_SCAN_PLANS))
807 return -EINVAL;
808
809 iwl_mvm_scan_lmac_dwell(mvm, cmd, params);
810
811 cmd->rx_chain_select = iwl_mvm_scan_rx_chain(mvm);
812 cmd->iter_num = cpu_to_le32(1);
813 cmd->n_channels = (u8)params->n_channels;
814
815 cmd->delay = cpu_to_le32(params->delay);
816
817 cmd->scan_flags = cpu_to_le32(iwl_mvm_scan_lmac_flags(mvm, params));
818
819 cmd->flags = iwl_mvm_scan_rxon_flags(params->channels[0]->band);
820 cmd->filter_flags = cpu_to_le32(MAC_FILTER_ACCEPT_GRP |
821 MAC_FILTER_IN_BEACON);
822 iwl_mvm_scan_fill_tx_cmd(mvm, cmd->tx_cmd, params->no_cck);
823 iwl_scan_build_ssids(params, cmd->direct_scan, &ssid_bitmap);
824
825 /* this API uses bits 1-20 instead of 0-19 */
826 ssid_bitmap <<= 1;
827
828 for (i = 0; i < params->n_scan_plans; i++) {
829 struct cfg80211_sched_scan_plan *scan_plan =
830 &params->scan_plans[i];
831
832 cmd->schedule[i].delay =
833 cpu_to_le16(scan_plan->interval);
834 cmd->schedule[i].iterations = scan_plan->iterations;
835 cmd->schedule[i].full_scan_mul = 1;
836 }
837
838 /*
839 * If the number of iterations of the last scan plan is set to
840 * zero, it should run infinitely. However, this is not always the case.
841 * For example, when regular scan is requested the driver sets one scan
842 * plan with one iteration.
843 */
844 if (!cmd->schedule[i - 1].iterations)
845 cmd->schedule[i - 1].iterations = 0xff;
846
847 if (iwl_mvm_scan_use_ebs(mvm, vif)) {
848 cmd->channel_opt[0].flags =
849 cpu_to_le16(IWL_SCAN_CHANNEL_FLAG_EBS |
850 IWL_SCAN_CHANNEL_FLAG_EBS_ACCURATE |
851 IWL_SCAN_CHANNEL_FLAG_CACHE_ADD);
852 cmd->channel_opt[0].non_ebs_ratio =
853 cpu_to_le16(IWL_DENSE_EBS_SCAN_RATIO);
854 cmd->channel_opt[1].flags =
855 cpu_to_le16(IWL_SCAN_CHANNEL_FLAG_EBS |
856 IWL_SCAN_CHANNEL_FLAG_EBS_ACCURATE |
857 IWL_SCAN_CHANNEL_FLAG_CACHE_ADD);
858 cmd->channel_opt[1].non_ebs_ratio =
859 cpu_to_le16(IWL_SPARSE_EBS_SCAN_RATIO);
860 }
861
862 iwl_mvm_lmac_scan_cfg_channels(mvm, params->channels,
863 params->n_channels, ssid_bitmap, cmd);
864
865 *preq = params->preq;
866
867 return 0;
868 }
869
870 static int rate_to_scan_rate_flag(unsigned int rate)
871 {
872 static const int rate_to_scan_rate[IWL_RATE_COUNT] = {
873 [IWL_RATE_1M_INDEX] = SCAN_CONFIG_RATE_1M,
874 [IWL_RATE_2M_INDEX] = SCAN_CONFIG_RATE_2M,
875 [IWL_RATE_5M_INDEX] = SCAN_CONFIG_RATE_5M,
876 [IWL_RATE_11M_INDEX] = SCAN_CONFIG_RATE_11M,
877 [IWL_RATE_6M_INDEX] = SCAN_CONFIG_RATE_6M,
878 [IWL_RATE_9M_INDEX] = SCAN_CONFIG_RATE_9M,
879 [IWL_RATE_12M_INDEX] = SCAN_CONFIG_RATE_12M,
880 [IWL_RATE_18M_INDEX] = SCAN_CONFIG_RATE_18M,
881 [IWL_RATE_24M_INDEX] = SCAN_CONFIG_RATE_24M,
882 [IWL_RATE_36M_INDEX] = SCAN_CONFIG_RATE_36M,
883 [IWL_RATE_48M_INDEX] = SCAN_CONFIG_RATE_48M,
884 [IWL_RATE_54M_INDEX] = SCAN_CONFIG_RATE_54M,
885 };
886
887 return rate_to_scan_rate[rate];
888 }
889
890 static __le32 iwl_mvm_scan_config_rates(struct iwl_mvm *mvm)
891 {
892 struct ieee80211_supported_band *band;
893 unsigned int rates = 0;
894 int i;
895
896 band = &mvm->nvm_data->bands[IEEE80211_BAND_2GHZ];
897 for (i = 0; i < band->n_bitrates; i++)
898 rates |= rate_to_scan_rate_flag(band->bitrates[i].hw_value);
899 band = &mvm->nvm_data->bands[IEEE80211_BAND_5GHZ];
900 for (i = 0; i < band->n_bitrates; i++)
901 rates |= rate_to_scan_rate_flag(band->bitrates[i].hw_value);
902
903 /* Set both basic rates and supported rates */
904 rates |= SCAN_CONFIG_SUPPORTED_RATE(rates);
905
906 return cpu_to_le32(rates);
907 }
908
909 int iwl_mvm_config_scan(struct iwl_mvm *mvm)
910 {
911 struct iwl_scan_config *scan_config;
912 struct ieee80211_supported_band *band;
913 int num_channels =
914 mvm->nvm_data->bands[IEEE80211_BAND_2GHZ].n_channels +
915 mvm->nvm_data->bands[IEEE80211_BAND_5GHZ].n_channels;
916 int ret, i, j = 0, cmd_size;
917 struct iwl_host_cmd cmd = {
918 .id = iwl_cmd_id(SCAN_CFG_CMD, IWL_ALWAYS_LONG_GROUP, 0),
919 };
920
921 if (WARN_ON(num_channels > mvm->fw->ucode_capa.n_scan_channels))
922 return -ENOBUFS;
923
924 cmd_size = sizeof(*scan_config) + mvm->fw->ucode_capa.n_scan_channels;
925
926 scan_config = kzalloc(cmd_size, GFP_KERNEL);
927 if (!scan_config)
928 return -ENOMEM;
929
930 mvm->scan_fragmented = iwl_mvm_low_latency(mvm);
931
932 scan_config->flags = cpu_to_le32(SCAN_CONFIG_FLAG_ACTIVATE |
933 SCAN_CONFIG_FLAG_ALLOW_CHUB_REQS |
934 SCAN_CONFIG_FLAG_SET_TX_CHAINS |
935 SCAN_CONFIG_FLAG_SET_RX_CHAINS |
936 SCAN_CONFIG_FLAG_SET_ALL_TIMES |
937 SCAN_CONFIG_FLAG_SET_LEGACY_RATES |
938 SCAN_CONFIG_FLAG_SET_MAC_ADDR |
939 SCAN_CONFIG_FLAG_SET_CHANNEL_FLAGS|
940 SCAN_CONFIG_N_CHANNELS(num_channels) |
941 (mvm->scan_fragmented ?
942 SCAN_CONFIG_FLAG_SET_FRAGMENTED :
943 SCAN_CONFIG_FLAG_CLEAR_FRAGMENTED));
944 scan_config->tx_chains = cpu_to_le32(iwl_mvm_get_valid_tx_ant(mvm));
945 scan_config->rx_chains = cpu_to_le32(iwl_mvm_scan_rx_ant(mvm));
946 scan_config->legacy_rates = iwl_mvm_scan_config_rates(mvm);
947 scan_config->out_of_channel_time = cpu_to_le32(170);
948 scan_config->suspend_time = cpu_to_le32(30);
949 scan_config->dwell_active = 20;
950 scan_config->dwell_passive = 110;
951 scan_config->dwell_fragmented = 20;
952
953 memcpy(&scan_config->mac_addr, &mvm->addresses[0].addr, ETH_ALEN);
954
955 scan_config->bcast_sta_id = mvm->aux_sta.sta_id;
956 scan_config->channel_flags = IWL_CHANNEL_FLAG_EBS |
957 IWL_CHANNEL_FLAG_ACCURATE_EBS |
958 IWL_CHANNEL_FLAG_EBS_ADD |
959 IWL_CHANNEL_FLAG_PRE_SCAN_PASSIVE2ACTIVE;
960
961 band = &mvm->nvm_data->bands[IEEE80211_BAND_2GHZ];
962 for (i = 0; i < band->n_channels; i++, j++)
963 scan_config->channel_array[j] = band->channels[i].hw_value;
964 band = &mvm->nvm_data->bands[IEEE80211_BAND_5GHZ];
965 for (i = 0; i < band->n_channels; i++, j++)
966 scan_config->channel_array[j] = band->channels[i].hw_value;
967
968 cmd.data[0] = scan_config;
969 cmd.len[0] = cmd_size;
970 cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
971
972 IWL_DEBUG_SCAN(mvm, "Sending UMAC scan config\n");
973
974 ret = iwl_mvm_send_cmd(mvm, &cmd);
975
976 kfree(scan_config);
977 return ret;
978 }
979
980 static int iwl_mvm_scan_uid_by_status(struct iwl_mvm *mvm, int status)
981 {
982 int i;
983
984 for (i = 0; i < mvm->max_scans; i++)
985 if (mvm->scan_uid_status[i] == status)
986 return i;
987
988 return -ENOENT;
989 }
990
991 static inline bool iwl_mvm_is_regular_scan(struct iwl_mvm_scan_params *params)
992 {
993 return params->n_scan_plans == 1 &&
994 params->scan_plans[0].iterations == 1;
995 }
996
997 static void iwl_mvm_scan_umac_dwell(struct iwl_mvm *mvm,
998 struct iwl_scan_req_umac *cmd,
999 struct iwl_mvm_scan_params *params)
1000 {
1001 cmd->active_dwell = scan_timing[params->type].dwell_active;
1002 cmd->passive_dwell = scan_timing[params->type].dwell_passive;
1003 cmd->fragmented_dwell = scan_timing[params->type].dwell_fragmented;
1004 cmd->max_out_time = cpu_to_le32(scan_timing[params->type].max_out_time);
1005 cmd->suspend_time = cpu_to_le32(scan_timing[params->type].suspend_time);
1006 cmd->scan_priority =
1007 iwl_mvm_scan_priority(mvm, IWL_SCAN_PRIORITY_EXT_6);
1008
1009 if (iwl_mvm_is_regular_scan(params))
1010 cmd->ooc_priority =
1011 iwl_mvm_scan_priority(mvm, IWL_SCAN_PRIORITY_EXT_6);
1012 else
1013 cmd->ooc_priority =
1014 iwl_mvm_scan_priority(mvm, IWL_SCAN_PRIORITY_EXT_2);
1015 }
1016
1017 static void
1018 iwl_mvm_umac_scan_cfg_channels(struct iwl_mvm *mvm,
1019 struct ieee80211_channel **channels,
1020 int n_channels, u32 ssid_bitmap,
1021 struct iwl_scan_req_umac *cmd)
1022 {
1023 struct iwl_scan_channel_cfg_umac *channel_cfg = (void *)&cmd->data;
1024 int i;
1025
1026 for (i = 0; i < n_channels; i++) {
1027 channel_cfg[i].flags = cpu_to_le32(ssid_bitmap);
1028 channel_cfg[i].channel_num = channels[i]->hw_value;
1029 channel_cfg[i].iter_count = 1;
1030 channel_cfg[i].iter_interval = 0;
1031 }
1032 }
1033
1034 static u32 iwl_mvm_scan_umac_flags(struct iwl_mvm *mvm,
1035 struct iwl_mvm_scan_params *params)
1036 {
1037 int flags = 0;
1038
1039 if (params->n_ssids == 0)
1040 flags = IWL_UMAC_SCAN_GEN_FLAGS_PASSIVE;
1041
1042 if (params->n_ssids == 1 && params->ssids[0].ssid_len != 0)
1043 flags |= IWL_UMAC_SCAN_GEN_FLAGS_PRE_CONNECT;
1044
1045 if (params->type == IWL_SCAN_TYPE_FRAGMENTED)
1046 flags |= IWL_UMAC_SCAN_GEN_FLAGS_FRAGMENTED;
1047
1048 if (iwl_mvm_rrm_scan_needed(mvm))
1049 flags |= IWL_UMAC_SCAN_GEN_FLAGS_RRM_ENABLED;
1050
1051 if (params->pass_all)
1052 flags |= IWL_UMAC_SCAN_GEN_FLAGS_PASS_ALL;
1053 else
1054 flags |= IWL_UMAC_SCAN_GEN_FLAGS_MATCH;
1055
1056 if (!iwl_mvm_is_regular_scan(params))
1057 flags |= IWL_UMAC_SCAN_GEN_FLAGS_PERIODIC;
1058
1059 #ifdef CONFIG_IWLWIFI_DEBUGFS
1060 if (mvm->scan_iter_notif_enabled)
1061 flags |= IWL_UMAC_SCAN_GEN_FLAGS_ITER_COMPLETE;
1062 #endif
1063 return flags;
1064 }
1065
1066 static int iwl_mvm_scan_umac(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1067 struct iwl_mvm_scan_params *params,
1068 int type)
1069 {
1070 struct iwl_scan_req_umac *cmd = mvm->scan_cmd;
1071 struct iwl_scan_req_umac_tail *sec_part = (void *)&cmd->data +
1072 sizeof(struct iwl_scan_channel_cfg_umac) *
1073 mvm->fw->ucode_capa.n_scan_channels;
1074 int uid, i;
1075 u32 ssid_bitmap = 0;
1076
1077 lockdep_assert_held(&mvm->mutex);
1078
1079 if (WARN_ON(params->n_scan_plans > IWL_MAX_SCHED_SCAN_PLANS))
1080 return -EINVAL;
1081
1082 uid = iwl_mvm_scan_uid_by_status(mvm, 0);
1083 if (uid < 0)
1084 return uid;
1085
1086 memset(cmd, 0, ksize(cmd));
1087
1088 iwl_mvm_scan_umac_dwell(mvm, cmd, params);
1089
1090 mvm->scan_uid_status[uid] = type;
1091
1092 cmd->uid = cpu_to_le32(uid);
1093 cmd->general_flags = cpu_to_le32(iwl_mvm_scan_umac_flags(mvm, params));
1094
1095 if (type == IWL_MVM_SCAN_SCHED)
1096 cmd->flags = cpu_to_le32(IWL_UMAC_SCAN_FLAG_PREEMPTIVE);
1097
1098 if (iwl_mvm_scan_use_ebs(mvm, vif))
1099 cmd->channel_flags = IWL_SCAN_CHANNEL_FLAG_EBS |
1100 IWL_SCAN_CHANNEL_FLAG_EBS_ACCURATE |
1101 IWL_SCAN_CHANNEL_FLAG_CACHE_ADD;
1102
1103 cmd->n_channels = params->n_channels;
1104
1105 iwl_scan_build_ssids(params, sec_part->direct_scan, &ssid_bitmap);
1106
1107 iwl_mvm_umac_scan_cfg_channels(mvm, params->channels,
1108 params->n_channels, ssid_bitmap, cmd);
1109
1110 for (i = 0; i < params->n_scan_plans; i++) {
1111 struct cfg80211_sched_scan_plan *scan_plan =
1112 &params->scan_plans[i];
1113
1114 sec_part->schedule[i].iter_count = scan_plan->iterations;
1115 sec_part->schedule[i].interval =
1116 cpu_to_le16(scan_plan->interval);
1117 }
1118
1119 /*
1120 * If the number of iterations of the last scan plan is set to
1121 * zero, it should run infinitely. However, this is not always the case.
1122 * For example, when regular scan is requested the driver sets one scan
1123 * plan with one iteration.
1124 */
1125 if (!sec_part->schedule[i - 1].iter_count)
1126 sec_part->schedule[i - 1].iter_count = 0xff;
1127
1128 sec_part->delay = cpu_to_le16(params->delay);
1129 sec_part->preq = params->preq;
1130
1131 return 0;
1132 }
1133
1134 static int iwl_mvm_num_scans(struct iwl_mvm *mvm)
1135 {
1136 return hweight32(mvm->scan_status & IWL_MVM_SCAN_MASK);
1137 }
1138
1139 static int iwl_mvm_check_running_scans(struct iwl_mvm *mvm, int type)
1140 {
1141 /* This looks a bit arbitrary, but the idea is that if we run
1142 * out of possible simultaneous scans and the userspace is
1143 * trying to run a scan type that is already running, we
1144 * return -EBUSY. But if the userspace wants to start a
1145 * different type of scan, we stop the opposite type to make
1146 * space for the new request. The reason is backwards
1147 * compatibility with old wpa_supplicant that wouldn't stop a
1148 * scheduled scan before starting a normal scan.
1149 */
1150
1151 if (iwl_mvm_num_scans(mvm) < mvm->max_scans)
1152 return 0;
1153
1154 /* Use a switch, even though this is a bitmask, so that more
1155 * than one bits set will fall in default and we will warn.
1156 */
1157 switch (type) {
1158 case IWL_MVM_SCAN_REGULAR:
1159 if (mvm->scan_status & IWL_MVM_SCAN_REGULAR_MASK)
1160 return -EBUSY;
1161 return iwl_mvm_scan_stop(mvm, IWL_MVM_SCAN_SCHED, true);
1162 case IWL_MVM_SCAN_SCHED:
1163 if (mvm->scan_status & IWL_MVM_SCAN_SCHED_MASK)
1164 return -EBUSY;
1165 iwl_mvm_scan_stop(mvm, IWL_MVM_SCAN_REGULAR, true);
1166 case IWL_MVM_SCAN_NETDETECT:
1167 /* No need to stop anything for net-detect since the
1168 * firmware is restarted anyway. This way, any sched
1169 * scans that were running will be restarted when we
1170 * resume.
1171 */
1172 return 0;
1173 default:
1174 WARN_ON(1);
1175 break;
1176 }
1177
1178 return -EIO;
1179 }
1180
1181 int iwl_mvm_reg_scan_start(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1182 struct cfg80211_scan_request *req,
1183 struct ieee80211_scan_ies *ies)
1184 {
1185 struct iwl_host_cmd hcmd = {
1186 .len = { iwl_mvm_scan_size(mvm), },
1187 .data = { mvm->scan_cmd, },
1188 .dataflags = { IWL_HCMD_DFL_NOCOPY, },
1189 };
1190 struct iwl_mvm_scan_params params = {};
1191 int ret;
1192 struct cfg80211_sched_scan_plan scan_plan = { .iterations = 1 };
1193
1194 lockdep_assert_held(&mvm->mutex);
1195
1196 if (iwl_mvm_is_lar_supported(mvm) && !mvm->lar_regdom_set) {
1197 IWL_ERR(mvm, "scan while LAR regdomain is not set\n");
1198 return -EBUSY;
1199 }
1200
1201 ret = iwl_mvm_check_running_scans(mvm, IWL_MVM_SCAN_REGULAR);
1202 if (ret)
1203 return ret;
1204
1205 /* we should have failed registration if scan_cmd was NULL */
1206 if (WARN_ON(!mvm->scan_cmd))
1207 return -ENOMEM;
1208
1209 if (!iwl_mvm_scan_fits(mvm, req->n_ssids, ies, req->n_channels))
1210 return -ENOBUFS;
1211
1212 params.n_ssids = req->n_ssids;
1213 params.flags = req->flags;
1214 params.n_channels = req->n_channels;
1215 params.delay = 0;
1216 params.ssids = req->ssids;
1217 params.channels = req->channels;
1218 params.mac_addr = req->mac_addr;
1219 params.mac_addr_mask = req->mac_addr_mask;
1220 params.no_cck = req->no_cck;
1221 params.pass_all = true;
1222 params.n_match_sets = 0;
1223 params.match_sets = NULL;
1224
1225 params.scan_plans = &scan_plan;
1226 params.n_scan_plans = 1;
1227
1228 params.type = iwl_mvm_get_scan_type(mvm, vif, &params);
1229
1230 iwl_mvm_build_scan_probe(mvm, vif, ies, &params);
1231
1232 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_UMAC_SCAN)) {
1233 hcmd.id = iwl_cmd_id(SCAN_REQ_UMAC, IWL_ALWAYS_LONG_GROUP, 0);
1234 ret = iwl_mvm_scan_umac(mvm, vif, &params,
1235 IWL_MVM_SCAN_REGULAR);
1236 } else {
1237 hcmd.id = SCAN_OFFLOAD_REQUEST_CMD;
1238 ret = iwl_mvm_scan_lmac(mvm, vif, &params);
1239 }
1240
1241 if (ret)
1242 return ret;
1243
1244 ret = iwl_mvm_send_cmd(mvm, &hcmd);
1245 if (ret) {
1246 /* If the scan failed, it usually means that the FW was unable
1247 * to allocate the time events. Warn on it, but maybe we
1248 * should try to send the command again with different params.
1249 */
1250 IWL_ERR(mvm, "Scan failed! ret %d\n", ret);
1251 return ret;
1252 }
1253
1254 IWL_DEBUG_SCAN(mvm, "Scan request was sent successfully\n");
1255 mvm->scan_status |= IWL_MVM_SCAN_REGULAR;
1256 iwl_mvm_ref(mvm, IWL_MVM_REF_SCAN);
1257
1258 return 0;
1259 }
1260
1261 int iwl_mvm_sched_scan_start(struct iwl_mvm *mvm,
1262 struct ieee80211_vif *vif,
1263 struct cfg80211_sched_scan_request *req,
1264 struct ieee80211_scan_ies *ies,
1265 int type)
1266 {
1267 struct iwl_host_cmd hcmd = {
1268 .len = { iwl_mvm_scan_size(mvm), },
1269 .data = { mvm->scan_cmd, },
1270 .dataflags = { IWL_HCMD_DFL_NOCOPY, },
1271 };
1272 struct iwl_mvm_scan_params params = {};
1273 int ret;
1274
1275 lockdep_assert_held(&mvm->mutex);
1276
1277 if (iwl_mvm_is_lar_supported(mvm) && !mvm->lar_regdom_set) {
1278 IWL_ERR(mvm, "sched-scan while LAR regdomain is not set\n");
1279 return -EBUSY;
1280 }
1281
1282 ret = iwl_mvm_check_running_scans(mvm, type);
1283 if (ret)
1284 return ret;
1285
1286 /* we should have failed registration if scan_cmd was NULL */
1287 if (WARN_ON(!mvm->scan_cmd))
1288 return -ENOMEM;
1289
1290 if (!iwl_mvm_scan_fits(mvm, req->n_ssids, ies, req->n_channels))
1291 return -ENOBUFS;
1292
1293 params.n_ssids = req->n_ssids;
1294 params.flags = req->flags;
1295 params.n_channels = req->n_channels;
1296 params.ssids = req->ssids;
1297 params.channels = req->channels;
1298 params.mac_addr = req->mac_addr;
1299 params.mac_addr_mask = req->mac_addr_mask;
1300 params.no_cck = false;
1301 params.pass_all = iwl_mvm_scan_pass_all(mvm, req);
1302 params.n_match_sets = req->n_match_sets;
1303 params.match_sets = req->match_sets;
1304 if (!req->n_scan_plans)
1305 return -EINVAL;
1306
1307 params.n_scan_plans = req->n_scan_plans;
1308 params.scan_plans = req->scan_plans;
1309
1310 params.type = iwl_mvm_get_scan_type(mvm, vif, &params);
1311
1312 /* In theory, LMAC scans can handle a 32-bit delay, but since
1313 * waiting for over 18 hours to start the scan is a bit silly
1314 * and to keep it aligned with UMAC scans (which only support
1315 * 16-bit delays), trim it down to 16-bits.
1316 */
1317 if (req->delay > U16_MAX) {
1318 IWL_DEBUG_SCAN(mvm,
1319 "delay value is > 16-bits, set to max possible\n");
1320 params.delay = U16_MAX;
1321 } else {
1322 params.delay = req->delay;
1323 }
1324
1325 ret = iwl_mvm_config_sched_scan_profiles(mvm, req);
1326 if (ret)
1327 return ret;
1328
1329 iwl_mvm_build_scan_probe(mvm, vif, ies, &params);
1330
1331 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_UMAC_SCAN)) {
1332 hcmd.id = iwl_cmd_id(SCAN_REQ_UMAC, IWL_ALWAYS_LONG_GROUP, 0);
1333 ret = iwl_mvm_scan_umac(mvm, vif, &params, IWL_MVM_SCAN_SCHED);
1334 } else {
1335 hcmd.id = SCAN_OFFLOAD_REQUEST_CMD;
1336 ret = iwl_mvm_scan_lmac(mvm, vif, &params);
1337 }
1338
1339 if (ret)
1340 return ret;
1341
1342 ret = iwl_mvm_send_cmd(mvm, &hcmd);
1343 if (!ret) {
1344 IWL_DEBUG_SCAN(mvm,
1345 "Sched scan request was sent successfully\n");
1346 mvm->scan_status |= type;
1347 } else {
1348 /* If the scan failed, it usually means that the FW was unable
1349 * to allocate the time events. Warn on it, but maybe we
1350 * should try to send the command again with different params.
1351 */
1352 IWL_ERR(mvm, "Sched scan failed! ret %d\n", ret);
1353 }
1354
1355 return ret;
1356 }
1357
1358 void iwl_mvm_rx_umac_scan_complete_notif(struct iwl_mvm *mvm,
1359 struct iwl_rx_cmd_buffer *rxb)
1360 {
1361 struct iwl_rx_packet *pkt = rxb_addr(rxb);
1362 struct iwl_umac_scan_complete *notif = (void *)pkt->data;
1363 u32 uid = __le32_to_cpu(notif->uid);
1364 bool aborted = (notif->status == IWL_SCAN_OFFLOAD_ABORTED);
1365
1366 if (WARN_ON(!(mvm->scan_uid_status[uid] & mvm->scan_status)))
1367 return;
1368
1369 /* if the scan is already stopping, we don't need to notify mac80211 */
1370 if (mvm->scan_uid_status[uid] == IWL_MVM_SCAN_REGULAR) {
1371 ieee80211_scan_completed(mvm->hw, aborted);
1372 iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
1373 } else if (mvm->scan_uid_status[uid] == IWL_MVM_SCAN_SCHED) {
1374 ieee80211_sched_scan_stopped(mvm->hw);
1375 }
1376
1377 mvm->scan_status &= ~mvm->scan_uid_status[uid];
1378 IWL_DEBUG_SCAN(mvm,
1379 "Scan completed, uid %u type %u, status %s, EBS status %s\n",
1380 uid, mvm->scan_uid_status[uid],
1381 notif->status == IWL_SCAN_OFFLOAD_COMPLETED ?
1382 "completed" : "aborted",
1383 iwl_mvm_ebs_status_str(notif->ebs_status));
1384 IWL_DEBUG_SCAN(mvm,
1385 "Last line %d, Last iteration %d, Time from last iteration %d\n",
1386 notif->last_schedule, notif->last_iter,
1387 __le32_to_cpu(notif->time_from_last_iter));
1388
1389 if (notif->ebs_status != IWL_SCAN_EBS_SUCCESS &&
1390 notif->ebs_status != IWL_SCAN_EBS_INACTIVE)
1391 mvm->last_ebs_successful = false;
1392
1393 mvm->scan_uid_status[uid] = 0;
1394 }
1395
1396 void iwl_mvm_rx_umac_scan_iter_complete_notif(struct iwl_mvm *mvm,
1397 struct iwl_rx_cmd_buffer *rxb)
1398 {
1399 struct iwl_rx_packet *pkt = rxb_addr(rxb);
1400 struct iwl_umac_scan_iter_complete_notif *notif = (void *)pkt->data;
1401 u8 buf[256];
1402
1403 IWL_DEBUG_SCAN(mvm,
1404 "UMAC Scan iteration complete: status=0x%x scanned_channels=%d channels list: %s\n",
1405 notif->status, notif->scanned_channels,
1406 iwl_mvm_dump_channel_list(notif->results,
1407 notif->scanned_channels, buf,
1408 sizeof(buf)));
1409 }
1410
1411 static int iwl_mvm_umac_scan_abort(struct iwl_mvm *mvm, int type)
1412 {
1413 struct iwl_umac_scan_abort cmd = {};
1414 int uid, ret;
1415
1416 lockdep_assert_held(&mvm->mutex);
1417
1418 /* We should always get a valid index here, because we already
1419 * checked that this type of scan was running in the generic
1420 * code.
1421 */
1422 uid = iwl_mvm_scan_uid_by_status(mvm, type);
1423 if (WARN_ON_ONCE(uid < 0))
1424 return uid;
1425
1426 cmd.uid = cpu_to_le32(uid);
1427
1428 IWL_DEBUG_SCAN(mvm, "Sending scan abort, uid %u\n", uid);
1429
1430 ret = iwl_mvm_send_cmd_pdu(mvm,
1431 iwl_cmd_id(SCAN_ABORT_UMAC,
1432 IWL_ALWAYS_LONG_GROUP, 0),
1433 0, sizeof(cmd), &cmd);
1434 if (!ret)
1435 mvm->scan_uid_status[uid] = type << IWL_MVM_SCAN_STOPPING_SHIFT;
1436
1437 return ret;
1438 }
1439
1440 static int iwl_mvm_scan_stop_wait(struct iwl_mvm *mvm, int type)
1441 {
1442 struct iwl_notification_wait wait_scan_done;
1443 static const u16 scan_done_notif[] = { SCAN_COMPLETE_UMAC,
1444 SCAN_OFFLOAD_COMPLETE, };
1445 int ret;
1446
1447 lockdep_assert_held(&mvm->mutex);
1448
1449 iwl_init_notification_wait(&mvm->notif_wait, &wait_scan_done,
1450 scan_done_notif,
1451 ARRAY_SIZE(scan_done_notif),
1452 NULL, NULL);
1453
1454 IWL_DEBUG_SCAN(mvm, "Preparing to stop scan, type %x\n", type);
1455
1456 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_UMAC_SCAN))
1457 ret = iwl_mvm_umac_scan_abort(mvm, type);
1458 else
1459 ret = iwl_mvm_lmac_scan_abort(mvm);
1460
1461 if (ret) {
1462 IWL_DEBUG_SCAN(mvm, "couldn't stop scan type %d\n", type);
1463 iwl_remove_notification(&mvm->notif_wait, &wait_scan_done);
1464 return ret;
1465 }
1466
1467 ret = iwl_wait_notification(&mvm->notif_wait, &wait_scan_done, 1 * HZ);
1468
1469 return ret;
1470 }
1471
1472 int iwl_mvm_scan_size(struct iwl_mvm *mvm)
1473 {
1474 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_UMAC_SCAN))
1475 return sizeof(struct iwl_scan_req_umac) +
1476 sizeof(struct iwl_scan_channel_cfg_umac) *
1477 mvm->fw->ucode_capa.n_scan_channels +
1478 sizeof(struct iwl_scan_req_umac_tail);
1479
1480 return sizeof(struct iwl_scan_req_lmac) +
1481 sizeof(struct iwl_scan_channel_cfg_lmac) *
1482 mvm->fw->ucode_capa.n_scan_channels +
1483 sizeof(struct iwl_scan_probe_req);
1484 }
1485
1486 /*
1487 * This function is used in nic restart flow, to inform mac80211 about scans
1488 * that was aborted by restart flow or by an assert.
1489 */
1490 void iwl_mvm_report_scan_aborted(struct iwl_mvm *mvm)
1491 {
1492 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_UMAC_SCAN)) {
1493 int uid, i;
1494
1495 uid = iwl_mvm_scan_uid_by_status(mvm, IWL_MVM_SCAN_REGULAR);
1496 if (uid >= 0) {
1497 ieee80211_scan_completed(mvm->hw, true);
1498 mvm->scan_uid_status[uid] = 0;
1499 }
1500 uid = iwl_mvm_scan_uid_by_status(mvm, IWL_MVM_SCAN_SCHED);
1501 if (uid >= 0 && !mvm->restart_fw) {
1502 ieee80211_sched_scan_stopped(mvm->hw);
1503 mvm->scan_uid_status[uid] = 0;
1504 }
1505
1506 /* We shouldn't have any UIDs still set. Loop over all the
1507 * UIDs to make sure there's nothing left there and warn if
1508 * any is found.
1509 */
1510 for (i = 0; i < mvm->max_scans; i++) {
1511 if (WARN_ONCE(mvm->scan_uid_status[i],
1512 "UMAC scan UID %d status was not cleaned\n",
1513 i))
1514 mvm->scan_uid_status[i] = 0;
1515 }
1516 } else {
1517 if (mvm->scan_status & IWL_MVM_SCAN_REGULAR)
1518 ieee80211_scan_completed(mvm->hw, true);
1519
1520 /* Sched scan will be restarted by mac80211 in
1521 * restart_hw, so do not report if FW is about to be
1522 * restarted.
1523 */
1524 if ((mvm->scan_status & IWL_MVM_SCAN_SCHED) && !mvm->restart_fw)
1525 ieee80211_sched_scan_stopped(mvm->hw);
1526 }
1527 }
1528
1529 int iwl_mvm_scan_stop(struct iwl_mvm *mvm, int type, bool notify)
1530 {
1531 int ret;
1532
1533 if (!(mvm->scan_status & type))
1534 return 0;
1535
1536 if (iwl_mvm_is_radio_killed(mvm)) {
1537 ret = 0;
1538 goto out;
1539 }
1540
1541 ret = iwl_mvm_scan_stop_wait(mvm, type);
1542 if (!ret)
1543 mvm->scan_status |= type << IWL_MVM_SCAN_STOPPING_SHIFT;
1544 out:
1545 /* Clear the scan status so the next scan requests will
1546 * succeed and mark the scan as stopping, so that the Rx
1547 * handler doesn't do anything, as the scan was stopped from
1548 * above.
1549 */
1550 mvm->scan_status &= ~type;
1551
1552 if (type == IWL_MVM_SCAN_REGULAR) {
1553 /* Since the rx handler won't do anything now, we have
1554 * to release the scan reference here.
1555 */
1556 iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
1557 if (notify)
1558 ieee80211_scan_completed(mvm->hw, true);
1559 } else if (notify) {
1560 ieee80211_sched_scan_stopped(mvm->hw);
1561 }
1562
1563 return ret;
1564 }
Linux kernel - Deliverables
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