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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 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of version 2 of the GNU General Public License as
12 * published by the Free Software Foundation.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
22 * USA
23 *
24 * The full GNU General Public License is included in this distribution
25 * in the file called COPYING.
26 *
27 * Contact Information:
28 * Intel Linux Wireless <ilw@linux.intel.com>
29 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
30 *
31 * BSD LICENSE
32 *
33 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
34 * All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 *
40 * * Redistributions of source code must retain the above copyright
41 * notice, this list of conditions and the following disclaimer.
42 * * Redistributions in binary form must reproduce the above copyright
43 * notice, this list of conditions and the following disclaimer in
44 * the documentation and/or other materials provided with the
45 * distribution.
46 * * Neither the name Intel Corporation nor the names of its
47 * contributors may be used to endorse or promote products derived
48 * from this software without specific prior written permission.
49 *
50 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
51 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
52 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
53 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
54 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
55 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
56 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
57 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
58 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
59 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
60 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
61 *
62 *****************************************************************************/
63
64#include <linux/etherdevice.h>
65#include <net/mac80211.h>
66
67#include "mvm.h"
68#include "iwl-eeprom-parse.h"
69#include "fw-api-scan.h"
70
71#define IWL_PLCP_QUIET_THRESH 1
72#define IWL_ACTIVE_QUIET_TIME 10
73
74struct iwl_mvm_scan_params {
75 u32 max_out_time;
76 u32 suspend_time;
77 bool passive_fragmented;
78 struct _dwell {
79 u16 passive;
80 u16 active;
81 } dwell[IEEE80211_NUM_BANDS];
82};
83
84static inline __le16 iwl_mvm_scan_rx_chain(struct iwl_mvm *mvm)
85{
86 u16 rx_chain;
87 u8 rx_ant;
88
89 if (mvm->scan_rx_ant != ANT_NONE)
90 rx_ant = mvm->scan_rx_ant;
91 else
92 rx_ant = mvm->fw->valid_rx_ant;
93 rx_chain = rx_ant << PHY_RX_CHAIN_VALID_POS;
94 rx_chain |= rx_ant << PHY_RX_CHAIN_FORCE_MIMO_SEL_POS;
95 rx_chain |= rx_ant << PHY_RX_CHAIN_FORCE_SEL_POS;
96 rx_chain |= 0x1 << PHY_RX_CHAIN_DRIVER_FORCE_POS;
97 return cpu_to_le16(rx_chain);
98}
99
100static inline __le32
101iwl_mvm_scan_rxon_flags(struct cfg80211_scan_request *req)
102{
103 if (req->channels[0]->band == IEEE80211_BAND_2GHZ)
104 return cpu_to_le32(PHY_BAND_24);
105 else
106 return cpu_to_le32(PHY_BAND_5);
107}
108
109static inline __le32
110iwl_mvm_scan_rate_n_flags(struct iwl_mvm *mvm, enum ieee80211_band band,
111 bool no_cck)
112{
113 u32 tx_ant;
114
115 mvm->scan_last_antenna_idx =
116 iwl_mvm_next_antenna(mvm, mvm->fw->valid_tx_ant,
117 mvm->scan_last_antenna_idx);
118 tx_ant = BIT(mvm->scan_last_antenna_idx) << RATE_MCS_ANT_POS;
119
120 if (band == IEEE80211_BAND_2GHZ && !no_cck)
121 return cpu_to_le32(IWL_RATE_1M_PLCP | RATE_MCS_CCK_MSK |
122 tx_ant);
123 else
124 return cpu_to_le32(IWL_RATE_6M_PLCP | tx_ant);
125}
126
127/*
128 * We insert the SSIDs in an inverted order, because the FW will
129 * invert it back. The most prioritized SSID, which is first in the
130 * request list, is not copied here, but inserted directly to the probe
131 * request.
132 */
133static void iwl_mvm_scan_fill_ssids(struct iwl_scan_cmd *cmd,
134 struct cfg80211_scan_request *req,
135 int first)
136{
137 int fw_idx, req_idx;
138
139 for (req_idx = req->n_ssids - 1, fw_idx = 0; req_idx >= first;
140 req_idx--, fw_idx++) {
141 cmd->direct_scan[fw_idx].id = WLAN_EID_SSID;
142 cmd->direct_scan[fw_idx].len = req->ssids[req_idx].ssid_len;
143 memcpy(cmd->direct_scan[fw_idx].ssid,
144 req->ssids[req_idx].ssid,
145 req->ssids[req_idx].ssid_len);
146 }
147}
148
149/*
150 * If req->n_ssids > 0, it means we should do an active scan.
151 * In case of active scan w/o directed scan, we receive a zero-length SSID
152 * just to notify that this scan is active and not passive.
153 * In order to notify the FW of the number of SSIDs we wish to scan (including
154 * the zero-length one), we need to set the corresponding bits in chan->type,
155 * one for each SSID, and set the active bit (first). If the first SSID is
156 * already included in the probe template, so we need to set only
157 * req->n_ssids - 1 bits in addition to the first bit.
158 */
159static u16 iwl_mvm_get_active_dwell(enum ieee80211_band band, int n_ssids)
160{
161 if (band == IEEE80211_BAND_2GHZ)
162 return 30 + 3 * (n_ssids + 1);
163 return 20 + 2 * (n_ssids + 1);
164}
165
166static u16 iwl_mvm_get_passive_dwell(enum ieee80211_band band)
167{
168 return band == IEEE80211_BAND_2GHZ ? 100 + 20 : 100 + 10;
169}
170
171static void iwl_mvm_scan_fill_channels(struct iwl_scan_cmd *cmd,
172 struct cfg80211_scan_request *req,
173 bool basic_ssid,
174 struct iwl_mvm_scan_params *params)
175{
176 struct iwl_scan_channel *chan = (struct iwl_scan_channel *)
177 (cmd->data + le16_to_cpu(cmd->tx_cmd.len));
178 int i;
179 int type = BIT(req->n_ssids) - 1;
180 enum ieee80211_band band = req->channels[0]->band;
181
182 if (!basic_ssid)
183 type |= BIT(req->n_ssids);
184
185 for (i = 0; i < cmd->channel_count; i++) {
186 chan->channel = cpu_to_le16(req->channels[i]->hw_value);
187 chan->type = cpu_to_le32(type);
188 if (req->channels[i]->flags & IEEE80211_CHAN_NO_IR)
189 chan->type &= cpu_to_le32(~SCAN_CHANNEL_TYPE_ACTIVE);
190 chan->active_dwell = cpu_to_le16(params->dwell[band].active);
191 chan->passive_dwell = cpu_to_le16(params->dwell[band].passive);
192 chan->iteration_count = cpu_to_le16(1);
193 chan++;
194 }
195}
196
197/*
198 * Fill in probe request with the following parameters:
199 * TA is our vif HW address, which mac80211 ensures we have.
200 * Packet is broadcasted, so this is both SA and DA.
201 * The probe request IE is made out of two: first comes the most prioritized
202 * SSID if a directed scan is requested. Second comes whatever extra
203 * information was given to us as the scan request IE.
204 */
205static u16 iwl_mvm_fill_probe_req(struct ieee80211_mgmt *frame, const u8 *ta,
206 int n_ssids, const u8 *ssid, int ssid_len,
207 const u8 *ie, int ie_len,
208 int left)
209{
210 int len = 0;
211 u8 *pos = NULL;
212
213 /* Make sure there is enough space for the probe request,
214 * two mandatory IEs and the data */
215 left -= 24;
216 if (left < 0)
217 return 0;
218
219 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
220 eth_broadcast_addr(frame->da);
221 memcpy(frame->sa, ta, ETH_ALEN);
222 eth_broadcast_addr(frame->bssid);
223 frame->seq_ctrl = 0;
224
225 len += 24;
226
227 /* for passive scans, no need to fill anything */
228 if (n_ssids == 0)
229 return (u16)len;
230
231 /* points to the payload of the request */
232 pos = &frame->u.probe_req.variable[0];
233
234 /* fill in our SSID IE */
235 left -= ssid_len + 2;
236 if (left < 0)
237 return 0;
238 *pos++ = WLAN_EID_SSID;
239 *pos++ = ssid_len;
240 if (ssid && ssid_len) { /* ssid_len may be == 0 even if ssid is valid */
241 memcpy(pos, ssid, ssid_len);
242 pos += ssid_len;
243 }
244
245 len += ssid_len + 2;
246
247 if (WARN_ON(left < ie_len))
248 return len;
249
250 if (ie && ie_len) {
251 memcpy(pos, ie, ie_len);
252 len += ie_len;
253 }
254
255 return (u16)len;
256}
257
258static void iwl_mvm_scan_condition_iterator(void *data, u8 *mac,
259 struct ieee80211_vif *vif)
260{
261 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
262 bool *global_bound = data;
263
264 if (mvmvif->phy_ctxt && mvmvif->phy_ctxt->id < MAX_PHYS)
265 *global_bound = true;
266}
267
268static void iwl_mvm_scan_calc_params(struct iwl_mvm *mvm,
269 struct ieee80211_vif *vif,
270 int n_ssids,
271 struct iwl_mvm_scan_params *params)
272{
273 bool global_bound = false;
274 enum ieee80211_band band;
275
276 ieee80211_iterate_active_interfaces_atomic(mvm->hw,
277 IEEE80211_IFACE_ITER_NORMAL,
278 iwl_mvm_scan_condition_iterator,
279 &global_bound);
280
281 if (!global_bound)
282 goto not_bound;
283
284 params->suspend_time = 100;
285 params->max_out_time = 600;
286
287 if (iwl_mvm_low_latency(mvm)) {
288 params->suspend_time = 250;
289 params->max_out_time = 250;
290 }
291
292not_bound:
293
294 for (band = IEEE80211_BAND_2GHZ; band < IEEE80211_NUM_BANDS; band++) {
295 params->dwell[band].passive = iwl_mvm_get_passive_dwell(band);
296 params->dwell[band].active = iwl_mvm_get_active_dwell(band,
297 n_ssids);
298 }
299}
300
301int iwl_mvm_scan_request(struct iwl_mvm *mvm,
302 struct ieee80211_vif *vif,
303 struct cfg80211_scan_request *req)
304{
305 struct iwl_host_cmd hcmd = {
306 .id = SCAN_REQUEST_CMD,
307 .len = { 0, },
308 .data = { mvm->scan_cmd, },
309 .flags = CMD_SYNC,
310 .dataflags = { IWL_HCMD_DFL_NOCOPY, },
311 };
312 struct iwl_scan_cmd *cmd = mvm->scan_cmd;
313 int ret;
314 u32 status;
315 int ssid_len = 0;
316 u8 *ssid = NULL;
317 bool basic_ssid = !(mvm->fw->ucode_capa.flags &
318 IWL_UCODE_TLV_FLAGS_NO_BASIC_SSID);
319 struct iwl_mvm_scan_params params = {};
320
321 lockdep_assert_held(&mvm->mutex);
322 BUG_ON(mvm->scan_cmd == NULL);
323
324 IWL_DEBUG_SCAN(mvm, "Handling mac80211 scan request\n");
325 mvm->scan_status = IWL_MVM_SCAN_OS;
326 memset(cmd, 0, sizeof(struct iwl_scan_cmd) +
327 mvm->fw->ucode_capa.max_probe_length +
328 (MAX_NUM_SCAN_CHANNELS * sizeof(struct iwl_scan_channel)));
329
330 cmd->channel_count = (u8)req->n_channels;
331 cmd->quiet_time = cpu_to_le16(IWL_ACTIVE_QUIET_TIME);
332 cmd->quiet_plcp_th = cpu_to_le16(IWL_PLCP_QUIET_THRESH);
333 cmd->rxchain_sel_flags = iwl_mvm_scan_rx_chain(mvm);
334
335 iwl_mvm_scan_calc_params(mvm, vif, req->n_ssids, ¶ms);
336 cmd->max_out_time = cpu_to_le32(params.max_out_time);
337 cmd->suspend_time = cpu_to_le32(params.suspend_time);
338 if (params.passive_fragmented)
339 cmd->scan_flags |= SCAN_FLAGS_FRAGMENTED_SCAN;
340
341 cmd->rxon_flags = iwl_mvm_scan_rxon_flags(req);
342 cmd->filter_flags = cpu_to_le32(MAC_FILTER_ACCEPT_GRP |
343 MAC_FILTER_IN_BEACON);
344
345 if (vif->type == NL80211_IFTYPE_P2P_DEVICE)
346 cmd->type = cpu_to_le32(SCAN_TYPE_DISCOVERY_FORCED);
347 else
348 cmd->type = cpu_to_le32(SCAN_TYPE_FORCED);
349
350 cmd->repeats = cpu_to_le32(1);
351
352 /*
353 * If the user asked for passive scan, don't change to active scan if
354 * you see any activity on the channel - remain passive.
355 */
356 if (req->n_ssids > 0) {
357 cmd->passive2active = cpu_to_le16(1);
358 cmd->scan_flags |= SCAN_FLAGS_PASSIVE2ACTIVE;
359 if (basic_ssid) {
360 ssid = req->ssids[0].ssid;
361 ssid_len = req->ssids[0].ssid_len;
362 }
363 } else {
364 cmd->passive2active = 0;
365 cmd->scan_flags &= ~SCAN_FLAGS_PASSIVE2ACTIVE;
366 }
367
368 iwl_mvm_scan_fill_ssids(cmd, req, basic_ssid ? 1 : 0);
369
370 cmd->tx_cmd.tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL |
371 TX_CMD_FLG_BT_DIS);
372 cmd->tx_cmd.sta_id = mvm->aux_sta.sta_id;
373 cmd->tx_cmd.life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
374 cmd->tx_cmd.rate_n_flags =
375 iwl_mvm_scan_rate_n_flags(mvm, req->channels[0]->band,
376 req->no_cck);
377
378 cmd->tx_cmd.len =
379 cpu_to_le16(iwl_mvm_fill_probe_req(
380 (struct ieee80211_mgmt *)cmd->data,
381 vif->addr,
382 req->n_ssids, ssid, ssid_len,
383 req->ie, req->ie_len,
384 mvm->fw->ucode_capa.max_probe_length));
385
386 iwl_mvm_scan_fill_channels(cmd, req, basic_ssid, ¶ms);
387
388 cmd->len = cpu_to_le16(sizeof(struct iwl_scan_cmd) +
389 le16_to_cpu(cmd->tx_cmd.len) +
390 (cmd->channel_count * sizeof(struct iwl_scan_channel)));
391 hcmd.len[0] = le16_to_cpu(cmd->len);
392
393 status = SCAN_RESPONSE_OK;
394 ret = iwl_mvm_send_cmd_status(mvm, &hcmd, &status);
395 if (!ret && status == SCAN_RESPONSE_OK) {
396 IWL_DEBUG_SCAN(mvm, "Scan request was sent successfully\n");
397 } else {
398 /*
399 * If the scan failed, it usually means that the FW was unable
400 * to allocate the time events. Warn on it, but maybe we
401 * should try to send the command again with different params.
402 */
403 IWL_ERR(mvm, "Scan failed! status 0x%x ret %d\n",
404 status, ret);
405 mvm->scan_status = IWL_MVM_SCAN_NONE;
406 ret = -EIO;
407 }
408 return ret;
409}
410
411int iwl_mvm_rx_scan_response(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
412 struct iwl_device_cmd *cmd)
413{
414 struct iwl_rx_packet *pkt = rxb_addr(rxb);
415 struct iwl_cmd_response *resp = (void *)pkt->data;
416
417 IWL_DEBUG_SCAN(mvm, "Scan response received. status 0x%x\n",
418 le32_to_cpu(resp->status));
419 return 0;
420}
421
422int iwl_mvm_rx_scan_complete(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
423 struct iwl_device_cmd *cmd)
424{
425 struct iwl_rx_packet *pkt = rxb_addr(rxb);
426 struct iwl_scan_complete_notif *notif = (void *)pkt->data;
427
428 lockdep_assert_held(&mvm->mutex);
429
430 IWL_DEBUG_SCAN(mvm, "Scan complete: status=0x%x scanned channels=%d\n",
431 notif->status, notif->scanned_channels);
432
433 if (mvm->scan_status == IWL_MVM_SCAN_OS)
434 mvm->scan_status = IWL_MVM_SCAN_NONE;
435 ieee80211_scan_completed(mvm->hw, notif->status != SCAN_COMP_STATUS_OK);
436
437 iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
438
439 return 0;
440}
441
442int iwl_mvm_rx_sched_scan_results(struct iwl_mvm *mvm,
443 struct iwl_rx_cmd_buffer *rxb,
444 struct iwl_device_cmd *cmd)
445{
446 struct iwl_rx_packet *pkt = rxb_addr(rxb);
447 struct iwl_sched_scan_results *notif = (void *)pkt->data;
448
449 if (notif->client_bitmap & SCAN_CLIENT_SCHED_SCAN) {
450 IWL_DEBUG_SCAN(mvm, "Scheduled scan results\n");
451 ieee80211_sched_scan_results(mvm->hw);
452 }
453
454 return 0;
455}
456
457static bool iwl_mvm_scan_abort_notif(struct iwl_notif_wait_data *notif_wait,
458 struct iwl_rx_packet *pkt, void *data)
459{
460 struct iwl_mvm *mvm =
461 container_of(notif_wait, struct iwl_mvm, notif_wait);
462 struct iwl_scan_complete_notif *notif;
463 u32 *resp;
464
465 switch (pkt->hdr.cmd) {
466 case SCAN_ABORT_CMD:
467 resp = (void *)pkt->data;
468 if (*resp == CAN_ABORT_STATUS) {
469 IWL_DEBUG_SCAN(mvm,
470 "Scan can be aborted, wait until completion\n");
471 return false;
472 }
473
474 /*
475 * If scan cannot be aborted, it means that we had a
476 * SCAN_COMPLETE_NOTIFICATION in the pipe and it called
477 * ieee80211_scan_completed already.
478 */
479 IWL_DEBUG_SCAN(mvm, "Scan cannot be aborted, exit now: %d\n",
480 *resp);
481 return true;
482
483 case SCAN_COMPLETE_NOTIFICATION:
484 notif = (void *)pkt->data;
485 IWL_DEBUG_SCAN(mvm, "Scan aborted: status 0x%x\n",
486 notif->status);
487 return true;
488
489 default:
490 WARN_ON(1);
491 return false;
492 };
493}
494
495int iwl_mvm_cancel_scan(struct iwl_mvm *mvm)
496{
497 struct iwl_notification_wait wait_scan_abort;
498 static const u8 scan_abort_notif[] = { SCAN_ABORT_CMD,
499 SCAN_COMPLETE_NOTIFICATION };
500 int ret;
501
502 if (mvm->scan_status == IWL_MVM_SCAN_NONE)
503 return 0;
504
505 if (iwl_mvm_is_radio_killed(mvm)) {
506 ieee80211_scan_completed(mvm->hw, true);
507 iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
508 mvm->scan_status = IWL_MVM_SCAN_NONE;
509 return 0;
510 }
511
512 iwl_init_notification_wait(&mvm->notif_wait, &wait_scan_abort,
513 scan_abort_notif,
514 ARRAY_SIZE(scan_abort_notif),
515 iwl_mvm_scan_abort_notif, NULL);
516
517 ret = iwl_mvm_send_cmd_pdu(mvm, SCAN_ABORT_CMD, CMD_SYNC, 0, NULL);
518 if (ret) {
519 IWL_ERR(mvm, "Couldn't send SCAN_ABORT_CMD: %d\n", ret);
520 /* mac80211's state will be cleaned in the nic_restart flow */
521 goto out_remove_notif;
522 }
523
524 return iwl_wait_notification(&mvm->notif_wait, &wait_scan_abort, HZ);
525
526out_remove_notif:
527 iwl_remove_notification(&mvm->notif_wait, &wait_scan_abort);
528 return ret;
529}
530
531int iwl_mvm_rx_scan_offload_complete_notif(struct iwl_mvm *mvm,
532 struct iwl_rx_cmd_buffer *rxb,
533 struct iwl_device_cmd *cmd)
534{
535 struct iwl_rx_packet *pkt = rxb_addr(rxb);
536 struct iwl_scan_offload_complete *scan_notif = (void *)pkt->data;
537
538 /* scan status must be locked for proper checking */
539 lockdep_assert_held(&mvm->mutex);
540
541 IWL_DEBUG_SCAN(mvm, "Scheduled scan completed, status %s\n",
542 scan_notif->status == IWL_SCAN_OFFLOAD_COMPLETED ?
543 "completed" : "aborted");
544
545 /* only call mac80211 completion if the stop was initiated by FW */
546 if (mvm->scan_status == IWL_MVM_SCAN_SCHED) {
547 mvm->scan_status = IWL_MVM_SCAN_NONE;
548 ieee80211_sched_scan_stopped(mvm->hw);
549 }
550
551 return 0;
552}
553
554static void iwl_scan_offload_build_tx_cmd(struct iwl_mvm *mvm,
555 struct ieee80211_vif *vif,
556 struct ieee80211_sched_scan_ies *ies,
557 enum ieee80211_band band,
558 struct iwl_tx_cmd *cmd,
559 u8 *data)
560{
561 u16 cmd_len;
562
563 cmd->tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL);
564 cmd->life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
565 cmd->sta_id = mvm->aux_sta.sta_id;
566
567 cmd->rate_n_flags = iwl_mvm_scan_rate_n_flags(mvm, band, false);
568
569 cmd_len = iwl_mvm_fill_probe_req((struct ieee80211_mgmt *)data,
570 vif->addr,
571 1, NULL, 0,
572 ies->ie[band], ies->len[band],
573 SCAN_OFFLOAD_PROBE_REQ_SIZE);
574 cmd->len = cpu_to_le16(cmd_len);
575}
576
577static void iwl_build_scan_cmd(struct iwl_mvm *mvm,
578 struct ieee80211_vif *vif,
579 struct cfg80211_sched_scan_request *req,
580 struct iwl_scan_offload_cmd *scan,
581 struct iwl_mvm_scan_params *params)
582{
583 scan->channel_count =
584 mvm->nvm_data->bands[IEEE80211_BAND_2GHZ].n_channels +
585 mvm->nvm_data->bands[IEEE80211_BAND_5GHZ].n_channels;
586 scan->quiet_time = cpu_to_le16(IWL_ACTIVE_QUIET_TIME);
587 scan->quiet_plcp_th = cpu_to_le16(IWL_PLCP_QUIET_THRESH);
588 scan->good_CRC_th = IWL_GOOD_CRC_TH_DEFAULT;
589 scan->rx_chain = iwl_mvm_scan_rx_chain(mvm);
590
591 scan->max_out_time = cpu_to_le32(params->max_out_time);
592 scan->suspend_time = cpu_to_le32(params->suspend_time);
593
594 scan->filter_flags |= cpu_to_le32(MAC_FILTER_ACCEPT_GRP |
595 MAC_FILTER_IN_BEACON);
596 scan->scan_type = cpu_to_le32(SCAN_TYPE_BACKGROUND);
597 scan->rep_count = cpu_to_le32(1);
598
599 if (params->passive_fragmented)
600 scan->scan_flags |= SCAN_FLAGS_FRAGMENTED_SCAN;
601}
602
603static int iwl_ssid_exist(u8 *ssid, u8 ssid_len, struct iwl_ssid_ie *ssid_list)
604{
605 int i;
606
607 for (i = 0; i < PROBE_OPTION_MAX; i++) {
608 if (!ssid_list[i].len)
609 break;
610 if (ssid_list[i].len == ssid_len &&
611 !memcmp(ssid_list->ssid, ssid, ssid_len))
612 return i;
613 }
614 return -1;
615}
616
617static void iwl_scan_offload_build_ssid(struct cfg80211_sched_scan_request *req,
618 struct iwl_scan_offload_cmd *scan,
619 u32 *ssid_bitmap)
620{
621 int i, j;
622 int index;
623
624 /*
625 * copy SSIDs from match list.
626 * iwl_config_sched_scan_profiles() uses the order of these ssids to
627 * config match list.
628 */
629 for (i = 0; i < req->n_match_sets && i < PROBE_OPTION_MAX; i++) {
630 /* skip empty SSID matchsets */
631 if (!req->match_sets[i].ssid.ssid_len)
632 continue;
633 scan->direct_scan[i].id = WLAN_EID_SSID;
634 scan->direct_scan[i].len = req->match_sets[i].ssid.ssid_len;
635 memcpy(scan->direct_scan[i].ssid, req->match_sets[i].ssid.ssid,
636 scan->direct_scan[i].len);
637 }
638
639 /* add SSIDs from scan SSID list */
640 *ssid_bitmap = 0;
641 for (j = 0; j < req->n_ssids && i < PROBE_OPTION_MAX; j++) {
642 index = iwl_ssid_exist(req->ssids[j].ssid,
643 req->ssids[j].ssid_len,
644 scan->direct_scan);
645 if (index < 0) {
646 if (!req->ssids[j].ssid_len)
647 continue;
648 scan->direct_scan[i].id = WLAN_EID_SSID;
649 scan->direct_scan[i].len = req->ssids[j].ssid_len;
650 memcpy(scan->direct_scan[i].ssid, req->ssids[j].ssid,
651 scan->direct_scan[i].len);
652 *ssid_bitmap |= BIT(i + 1);
653 i++;
654 } else {
655 *ssid_bitmap |= BIT(index + 1);
656 }
657 }
658}
659
660static void iwl_build_channel_cfg(struct iwl_mvm *mvm,
661 struct cfg80211_sched_scan_request *req,
662 struct iwl_scan_channel_cfg *channels,
663 enum ieee80211_band band,
664 int *head, int *tail,
665 u32 ssid_bitmap,
666 struct iwl_mvm_scan_params *params)
667{
668 struct ieee80211_supported_band *s_band;
669 int n_channels = req->n_channels;
670 int i, j, index = 0;
671 bool partial;
672
673 /*
674 * We have to configure all supported channels, even if we don't want to
675 * scan on them, but we have to send channels in the order that we want
676 * to scan. So add requested channels to head of the list and others to
677 * the end.
678 */
679 s_band = &mvm->nvm_data->bands[band];
680
681 for (i = 0; i < s_band->n_channels && *head <= *tail; i++) {
682 partial = false;
683 for (j = 0; j < n_channels; j++)
684 if (s_band->channels[i].center_freq ==
685 req->channels[j]->center_freq) {
686 index = *head;
687 (*head)++;
688 /*
689 * Channels that came with the request will be
690 * in partial scan .
691 */
692 partial = true;
693 break;
694 }
695 if (!partial) {
696 index = *tail;
697 (*tail)--;
698 }
699 channels->channel_number[index] =
700 cpu_to_le16(ieee80211_frequency_to_channel(
701 s_band->channels[i].center_freq));
702 channels->dwell_time[index][0] = params->dwell[band].active;
703 channels->dwell_time[index][1] = params->dwell[band].passive;
704
705 channels->iter_count[index] = cpu_to_le16(1);
706 channels->iter_interval[index] = 0;
707
708 if (!(s_band->channels[i].flags & IEEE80211_CHAN_NO_IR))
709 channels->type[index] |=
710 cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_ACTIVE);
711
712 channels->type[index] |=
713 cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_FULL);
714 if (partial)
715 channels->type[index] |=
716 cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_PARTIAL);
717
718 if (s_band->channels[i].flags & IEEE80211_CHAN_NO_HT40)
719 channels->type[index] |=
720 cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_NARROW);
721
722 /* scan for all SSIDs from req->ssids */
723 channels->type[index] |= cpu_to_le32(ssid_bitmap);
724 }
725}
726
727int iwl_mvm_config_sched_scan(struct iwl_mvm *mvm,
728 struct ieee80211_vif *vif,
729 struct cfg80211_sched_scan_request *req,
730 struct ieee80211_sched_scan_ies *ies)
731{
732 int band_2ghz = mvm->nvm_data->bands[IEEE80211_BAND_2GHZ].n_channels;
733 int band_5ghz = mvm->nvm_data->bands[IEEE80211_BAND_5GHZ].n_channels;
734 int head = 0;
735 int tail = band_2ghz + band_5ghz - 1;
736 u32 ssid_bitmap;
737 int cmd_len;
738 int ret;
739
740 struct iwl_scan_offload_cfg *scan_cfg;
741 struct iwl_host_cmd cmd = {
742 .id = SCAN_OFFLOAD_CONFIG_CMD,
743 .flags = CMD_SYNC,
744 };
745 struct iwl_mvm_scan_params params = {};
746
747 lockdep_assert_held(&mvm->mutex);
748
749 cmd_len = sizeof(struct iwl_scan_offload_cfg) +
750 2 * SCAN_OFFLOAD_PROBE_REQ_SIZE;
751
752 scan_cfg = kzalloc(cmd_len, GFP_KERNEL);
753 if (!scan_cfg)
754 return -ENOMEM;
755
756 iwl_mvm_scan_calc_params(mvm, vif, req->n_ssids, ¶ms);
757 iwl_build_scan_cmd(mvm, vif, req, &scan_cfg->scan_cmd, ¶ms);
758 scan_cfg->scan_cmd.len = cpu_to_le16(cmd_len);
759
760 iwl_scan_offload_build_ssid(req, &scan_cfg->scan_cmd, &ssid_bitmap);
761 /* build tx frames for supported bands */
762 if (band_2ghz) {
763 iwl_scan_offload_build_tx_cmd(mvm, vif, ies,
764 IEEE80211_BAND_2GHZ,
765 &scan_cfg->scan_cmd.tx_cmd[0],
766 scan_cfg->data);
767 iwl_build_channel_cfg(mvm, req, &scan_cfg->channel_cfg,
768 IEEE80211_BAND_2GHZ, &head, &tail,
769 ssid_bitmap, ¶ms);
770 }
771 if (band_5ghz) {
772 iwl_scan_offload_build_tx_cmd(mvm, vif, ies,
773 IEEE80211_BAND_5GHZ,
774 &scan_cfg->scan_cmd.tx_cmd[1],
775 scan_cfg->data +
776 SCAN_OFFLOAD_PROBE_REQ_SIZE);
777 iwl_build_channel_cfg(mvm, req, &scan_cfg->channel_cfg,
778 IEEE80211_BAND_5GHZ, &head, &tail,
779 ssid_bitmap, ¶ms);
780 }
781
782 cmd.data[0] = scan_cfg;
783 cmd.len[0] = cmd_len;
784 cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
785
786 IWL_DEBUG_SCAN(mvm, "Sending scheduled scan config\n");
787
788 ret = iwl_mvm_send_cmd(mvm, &cmd);
789 kfree(scan_cfg);
790 return ret;
791}
792
793int iwl_mvm_config_sched_scan_profiles(struct iwl_mvm *mvm,
794 struct cfg80211_sched_scan_request *req)
795{
796 struct iwl_scan_offload_profile *profile;
797 struct iwl_scan_offload_profile_cfg *profile_cfg;
798 struct iwl_scan_offload_blacklist *blacklist;
799 struct iwl_host_cmd cmd = {
800 .id = SCAN_OFFLOAD_UPDATE_PROFILES_CMD,
801 .flags = CMD_SYNC,
802 .len[1] = sizeof(*profile_cfg),
803 .dataflags[0] = IWL_HCMD_DFL_NOCOPY,
804 .dataflags[1] = IWL_HCMD_DFL_NOCOPY,
805 };
806 int blacklist_len;
807 int i;
808 int ret;
809
810 if (WARN_ON(req->n_match_sets > IWL_SCAN_MAX_PROFILES))
811 return -EIO;
812
813 if (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_SHORT_BL)
814 blacklist_len = IWL_SCAN_SHORT_BLACKLIST_LEN;
815 else
816 blacklist_len = IWL_SCAN_MAX_BLACKLIST_LEN;
817
818 blacklist = kzalloc(sizeof(*blacklist) * blacklist_len, GFP_KERNEL);
819 if (!blacklist)
820 return -ENOMEM;
821
822 profile_cfg = kzalloc(sizeof(*profile_cfg), GFP_KERNEL);
823 if (!profile_cfg) {
824 ret = -ENOMEM;
825 goto free_blacklist;
826 }
827
828 cmd.data[0] = blacklist;
829 cmd.len[0] = sizeof(*blacklist) * blacklist_len;
830 cmd.data[1] = profile_cfg;
831
832 /* No blacklist configuration */
833
834 profile_cfg->num_profiles = req->n_match_sets;
835 profile_cfg->active_clients = SCAN_CLIENT_SCHED_SCAN;
836 profile_cfg->pass_match = SCAN_CLIENT_SCHED_SCAN;
837 profile_cfg->match_notify = SCAN_CLIENT_SCHED_SCAN;
838 if (!req->n_match_sets || !req->match_sets[0].ssid.ssid_len)
839 profile_cfg->any_beacon_notify = SCAN_CLIENT_SCHED_SCAN;
840
841 for (i = 0; i < req->n_match_sets; i++) {
842 profile = &profile_cfg->profiles[i];
843 profile->ssid_index = i;
844 /* Support any cipher and auth algorithm */
845 profile->unicast_cipher = 0xff;
846 profile->auth_alg = 0xff;
847 profile->network_type = IWL_NETWORK_TYPE_ANY;
848 profile->band_selection = IWL_SCAN_OFFLOAD_SELECT_ANY;
849 profile->client_bitmap = SCAN_CLIENT_SCHED_SCAN;
850 }
851
852 IWL_DEBUG_SCAN(mvm, "Sending scheduled scan profile config\n");
853
854 ret = iwl_mvm_send_cmd(mvm, &cmd);
855 kfree(profile_cfg);
856free_blacklist:
857 kfree(blacklist);
858
859 return ret;
860}
861
862int iwl_mvm_sched_scan_start(struct iwl_mvm *mvm,
863 struct cfg80211_sched_scan_request *req)
864{
865 struct iwl_scan_offload_req scan_req = {
866 .watchdog = IWL_SCHED_SCAN_WATCHDOG,
867
868 .schedule_line[0].iterations = IWL_FAST_SCHED_SCAN_ITERATIONS,
869 .schedule_line[0].delay = req->interval / 1000,
870 .schedule_line[0].full_scan_mul = 1,
871
872 .schedule_line[1].iterations = 0xff,
873 .schedule_line[1].delay = req->interval / 1000,
874 .schedule_line[1].full_scan_mul = IWL_FULL_SCAN_MULTIPLIER,
875 };
876
877 if (req->n_match_sets && req->match_sets[0].ssid.ssid_len) {
878 IWL_DEBUG_SCAN(mvm,
879 "Sending scheduled scan with filtering, filter len %d\n",
880 req->n_match_sets);
881 } else {
882 IWL_DEBUG_SCAN(mvm,
883 "Sending Scheduled scan without filtering\n");
884 scan_req.flags |= cpu_to_le16(IWL_SCAN_OFFLOAD_FLAG_PASS_ALL);
885 }
886
887 return iwl_mvm_send_cmd_pdu(mvm, SCAN_OFFLOAD_REQUEST_CMD, CMD_SYNC,
888 sizeof(scan_req), &scan_req);
889}
890
891static int iwl_mvm_send_sched_scan_abort(struct iwl_mvm *mvm)
892{
893 int ret;
894 struct iwl_host_cmd cmd = {
895 .id = SCAN_OFFLOAD_ABORT_CMD,
896 .flags = CMD_SYNC,
897 };
898 u32 status;
899
900 /* Exit instantly with error when device is not ready
901 * to receive scan abort command or it does not perform
902 * scheduled scan currently */
903 if (mvm->scan_status != IWL_MVM_SCAN_SCHED)
904 return -EIO;
905
906 ret = iwl_mvm_send_cmd_status(mvm, &cmd, &status);
907 if (ret)
908 return ret;
909
910 if (status != CAN_ABORT_STATUS) {
911 /*
912 * The scan abort will return 1 for success or
913 * 2 for "failure". A failure condition can be
914 * due to simply not being in an active scan which
915 * can occur if we send the scan abort before the
916 * microcode has notified us that a scan is completed.
917 */
918 IWL_DEBUG_SCAN(mvm, "SCAN OFFLOAD ABORT ret %d.\n", status);
919 ret = -ENOENT;
920 }
921
922 return ret;
923}
924
925int iwl_mvm_sched_scan_stop(struct iwl_mvm *mvm)
926{
927 int ret;
928 struct iwl_notification_wait wait_scan_done;
929 static const u8 scan_done_notif[] = { SCAN_OFFLOAD_COMPLETE, };
930
931 lockdep_assert_held(&mvm->mutex);
932
933 if (mvm->scan_status != IWL_MVM_SCAN_SCHED) {
934 IWL_DEBUG_SCAN(mvm, "No offloaded scan to stop\n");
935 return 0;
936 }
937
938 iwl_init_notification_wait(&mvm->notif_wait, &wait_scan_done,
939 scan_done_notif,
940 ARRAY_SIZE(scan_done_notif),
941 NULL, NULL);
942
943 ret = iwl_mvm_send_sched_scan_abort(mvm);
944 if (ret) {
945 IWL_DEBUG_SCAN(mvm, "Send stop offload scan failed %d\n", ret);
946 iwl_remove_notification(&mvm->notif_wait, &wait_scan_done);
947 return ret;
948 }
949
950 IWL_DEBUG_SCAN(mvm, "Successfully sent stop offload scan\n");
951
952 ret = iwl_wait_notification(&mvm->notif_wait, &wait_scan_done, 1 * HZ);
953 if (ret)
954 return ret;
955
956 /*
957 * Clear the scan status so the next scan requests will succeed. This
958 * also ensures the Rx handler doesn't do anything, as the scan was
959 * stopped from above.
960 */
961 mvm->scan_status = IWL_MVM_SCAN_NONE;
962
963 return 0;
964}