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[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.
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 #define LONG_OUT_TIME_PERIOD 600
74 #define SHORT_OUT_TIME_PERIOD 200
75 #define SUSPEND_TIME_PERIOD 100
76
77 static inline __le16 iwl_mvm_scan_rx_chain(struct iwl_mvm *mvm)
78 {
79 u16 rx_chain;
80 u8 rx_ant;
81
82 if (mvm->scan_rx_ant != ANT_NONE)
83 rx_ant = mvm->scan_rx_ant;
84 else
85 rx_ant = iwl_fw_valid_rx_ant(mvm->fw);
86 rx_chain = rx_ant << PHY_RX_CHAIN_VALID_POS;
87 rx_chain |= rx_ant << PHY_RX_CHAIN_FORCE_MIMO_SEL_POS;
88 rx_chain |= rx_ant << PHY_RX_CHAIN_FORCE_SEL_POS;
89 rx_chain |= 0x1 << PHY_RX_CHAIN_DRIVER_FORCE_POS;
90 return cpu_to_le16(rx_chain);
91 }
92
93 static inline __le32 iwl_mvm_scan_max_out_time(struct ieee80211_vif *vif,
94 u32 flags, bool is_assoc)
95 {
96 if (!is_assoc)
97 return 0;
98 if (flags & NL80211_SCAN_FLAG_LOW_PRIORITY)
99 return cpu_to_le32(ieee80211_tu_to_usec(SHORT_OUT_TIME_PERIOD));
100 return cpu_to_le32(ieee80211_tu_to_usec(LONG_OUT_TIME_PERIOD));
101 }
102
103 static inline __le32 iwl_mvm_scan_suspend_time(struct ieee80211_vif *vif,
104 bool is_assoc)
105 {
106 if (!is_assoc)
107 return 0;
108 return cpu_to_le32(ieee80211_tu_to_usec(SUSPEND_TIME_PERIOD));
109 }
110
111 static inline __le32
112 iwl_mvm_scan_rxon_flags(struct cfg80211_scan_request *req)
113 {
114 if (req->channels[0]->band == IEEE80211_BAND_2GHZ)
115 return cpu_to_le32(PHY_BAND_24);
116 else
117 return cpu_to_le32(PHY_BAND_5);
118 }
119
120 static inline __le32
121 iwl_mvm_scan_rate_n_flags(struct iwl_mvm *mvm, enum ieee80211_band band,
122 bool no_cck)
123 {
124 u32 tx_ant;
125
126 mvm->scan_last_antenna_idx =
127 iwl_mvm_next_antenna(mvm, iwl_fw_valid_tx_ant(mvm->fw),
128 mvm->scan_last_antenna_idx);
129 tx_ant = BIT(mvm->scan_last_antenna_idx) << RATE_MCS_ANT_POS;
130
131 if (band == IEEE80211_BAND_2GHZ && !no_cck)
132 return cpu_to_le32(IWL_RATE_1M_PLCP | RATE_MCS_CCK_MSK |
133 tx_ant);
134 else
135 return cpu_to_le32(IWL_RATE_6M_PLCP | tx_ant);
136 }
137
138 /*
139 * We insert the SSIDs in an inverted order, because the FW will
140 * invert it back. The most prioritized SSID, which is first in the
141 * request list, is not copied here, but inserted directly to the probe
142 * request.
143 */
144 static void iwl_mvm_scan_fill_ssids(struct iwl_scan_cmd *cmd,
145 struct cfg80211_scan_request *req,
146 int first)
147 {
148 int fw_idx, req_idx;
149
150 for (req_idx = req->n_ssids - 1, fw_idx = 0; req_idx >= first;
151 req_idx--, fw_idx++) {
152 cmd->direct_scan[fw_idx].id = WLAN_EID_SSID;
153 cmd->direct_scan[fw_idx].len = req->ssids[req_idx].ssid_len;
154 memcpy(cmd->direct_scan[fw_idx].ssid,
155 req->ssids[req_idx].ssid,
156 req->ssids[req_idx].ssid_len);
157 }
158 }
159
160 /*
161 * If req->n_ssids > 0, it means we should do an active scan.
162 * In case of active scan w/o directed scan, we receive a zero-length SSID
163 * just to notify that this scan is active and not passive.
164 * In order to notify the FW of the number of SSIDs we wish to scan (including
165 * the zero-length one), we need to set the corresponding bits in chan->type,
166 * one for each SSID, and set the active bit (first). If the first SSID is
167 * already included in the probe template, so we need to set only
168 * req->n_ssids - 1 bits in addition to the first bit.
169 */
170 static u16 iwl_mvm_get_active_dwell(enum ieee80211_band band, int n_ssids)
171 {
172 if (band == IEEE80211_BAND_2GHZ)
173 return 30 + 3 * (n_ssids + 1);
174 return 20 + 2 * (n_ssids + 1);
175 }
176
177 static u16 iwl_mvm_get_passive_dwell(enum ieee80211_band band)
178 {
179 return band == IEEE80211_BAND_2GHZ ? 100 + 20 : 100 + 10;
180 }
181
182 static void iwl_mvm_scan_fill_channels(struct iwl_scan_cmd *cmd,
183 struct cfg80211_scan_request *req,
184 bool basic_ssid)
185 {
186 u16 passive_dwell = iwl_mvm_get_passive_dwell(req->channels[0]->band);
187 u16 active_dwell = iwl_mvm_get_active_dwell(req->channels[0]->band,
188 req->n_ssids);
189 struct iwl_scan_channel *chan = (struct iwl_scan_channel *)
190 (cmd->data + le16_to_cpu(cmd->tx_cmd.len));
191 int i;
192 int type = BIT(req->n_ssids) - 1;
193
194 if (!basic_ssid)
195 type |= BIT(req->n_ssids);
196
197 for (i = 0; i < cmd->channel_count; i++) {
198 chan->channel = cpu_to_le16(req->channels[i]->hw_value);
199 chan->type = cpu_to_le32(type);
200 if (req->channels[i]->flags & IEEE80211_CHAN_NO_IR)
201 chan->type &= cpu_to_le32(~SCAN_CHANNEL_TYPE_ACTIVE);
202 chan->active_dwell = cpu_to_le16(active_dwell);
203 chan->passive_dwell = cpu_to_le16(passive_dwell);
204 chan->iteration_count = cpu_to_le16(1);
205 chan++;
206 }
207 }
208
209 /*
210 * Fill in probe request with the following parameters:
211 * TA is our vif HW address, which mac80211 ensures we have.
212 * Packet is broadcasted, so this is both SA and DA.
213 * The probe request IE is made out of two: first comes the most prioritized
214 * SSID if a directed scan is requested. Second comes whatever extra
215 * information was given to us as the scan request IE.
216 */
217 static u16 iwl_mvm_fill_probe_req(struct ieee80211_mgmt *frame, const u8 *ta,
218 int n_ssids, const u8 *ssid, int ssid_len,
219 const u8 *ie, int ie_len,
220 int left)
221 {
222 int len = 0;
223 u8 *pos = NULL;
224
225 /* Make sure there is enough space for the probe request,
226 * two mandatory IEs and the data */
227 left -= 24;
228 if (left < 0)
229 return 0;
230
231 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
232 eth_broadcast_addr(frame->da);
233 memcpy(frame->sa, ta, ETH_ALEN);
234 eth_broadcast_addr(frame->bssid);
235 frame->seq_ctrl = 0;
236
237 len += 24;
238
239 /* for passive scans, no need to fill anything */
240 if (n_ssids == 0)
241 return (u16)len;
242
243 /* points to the payload of the request */
244 pos = &frame->u.probe_req.variable[0];
245
246 /* fill in our SSID IE */
247 left -= ssid_len + 2;
248 if (left < 0)
249 return 0;
250 *pos++ = WLAN_EID_SSID;
251 *pos++ = ssid_len;
252 if (ssid && ssid_len) { /* ssid_len may be == 0 even if ssid is valid */
253 memcpy(pos, ssid, ssid_len);
254 pos += ssid_len;
255 }
256
257 len += ssid_len + 2;
258
259 if (WARN_ON(left < ie_len))
260 return len;
261
262 if (ie && ie_len) {
263 memcpy(pos, ie, ie_len);
264 len += ie_len;
265 }
266
267 return (u16)len;
268 }
269
270 static void iwl_mvm_vif_assoc_iterator(void *data, u8 *mac,
271 struct ieee80211_vif *vif)
272 {
273 bool *is_assoc = data;
274
275 if (vif->bss_conf.assoc)
276 *is_assoc = true;
277 }
278
279 int iwl_mvm_scan_request(struct iwl_mvm *mvm,
280 struct ieee80211_vif *vif,
281 struct cfg80211_scan_request *req)
282 {
283 struct iwl_host_cmd hcmd = {
284 .id = SCAN_REQUEST_CMD,
285 .len = { 0, },
286 .data = { mvm->scan_cmd, },
287 .flags = CMD_SYNC,
288 .dataflags = { IWL_HCMD_DFL_NOCOPY, },
289 };
290 struct iwl_scan_cmd *cmd = mvm->scan_cmd;
291 bool is_assoc = false;
292 int ret;
293 u32 status;
294 int ssid_len = 0;
295 u8 *ssid = NULL;
296 bool basic_ssid = !(mvm->fw->ucode_capa.flags &
297 IWL_UCODE_TLV_FLAGS_NO_BASIC_SSID);
298
299 lockdep_assert_held(&mvm->mutex);
300 BUG_ON(mvm->scan_cmd == NULL);
301
302 IWL_DEBUG_SCAN(mvm, "Handling mac80211 scan request\n");
303 mvm->scan_status = IWL_MVM_SCAN_OS;
304 memset(cmd, 0, sizeof(struct iwl_scan_cmd) +
305 mvm->fw->ucode_capa.max_probe_length +
306 (MAX_NUM_SCAN_CHANNELS * sizeof(struct iwl_scan_channel)));
307 ieee80211_iterate_active_interfaces_atomic(mvm->hw,
308 IEEE80211_IFACE_ITER_NORMAL,
309 iwl_mvm_vif_assoc_iterator,
310 &is_assoc);
311 cmd->channel_count = (u8)req->n_channels;
312 cmd->quiet_time = cpu_to_le16(IWL_ACTIVE_QUIET_TIME);
313 cmd->quiet_plcp_th = cpu_to_le16(IWL_PLCP_QUIET_THRESH);
314 cmd->rxchain_sel_flags = iwl_mvm_scan_rx_chain(mvm);
315 cmd->max_out_time = iwl_mvm_scan_max_out_time(vif, req->flags,
316 is_assoc);
317 cmd->suspend_time = iwl_mvm_scan_suspend_time(vif, is_assoc);
318 cmd->rxon_flags = iwl_mvm_scan_rxon_flags(req);
319 cmd->filter_flags = cpu_to_le32(MAC_FILTER_ACCEPT_GRP |
320 MAC_FILTER_IN_BEACON);
321
322 if (vif->type == NL80211_IFTYPE_P2P_DEVICE)
323 cmd->type = cpu_to_le32(SCAN_TYPE_DISCOVERY_FORCED);
324 else
325 cmd->type = cpu_to_le32(SCAN_TYPE_FORCED);
326
327 cmd->repeats = cpu_to_le32(1);
328
329 /*
330 * If the user asked for passive scan, don't change to active scan if
331 * you see any activity on the channel - remain passive.
332 */
333 if (req->n_ssids > 0) {
334 cmd->passive2active = cpu_to_le16(1);
335 cmd->scan_flags |= SCAN_FLAGS_PASSIVE2ACTIVE;
336 if (basic_ssid) {
337 ssid = req->ssids[0].ssid;
338 ssid_len = req->ssids[0].ssid_len;
339 }
340 } else {
341 cmd->passive2active = 0;
342 cmd->scan_flags &= ~SCAN_FLAGS_PASSIVE2ACTIVE;
343 }
344
345 iwl_mvm_scan_fill_ssids(cmd, req, basic_ssid ? 1 : 0);
346
347 cmd->tx_cmd.tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL);
348 cmd->tx_cmd.sta_id = mvm->aux_sta.sta_id;
349 cmd->tx_cmd.life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
350 cmd->tx_cmd.rate_n_flags =
351 iwl_mvm_scan_rate_n_flags(mvm, req->channels[0]->band,
352 req->no_cck);
353
354 cmd->tx_cmd.len =
355 cpu_to_le16(iwl_mvm_fill_probe_req(
356 (struct ieee80211_mgmt *)cmd->data,
357 vif->addr,
358 req->n_ssids, ssid, ssid_len,
359 req->ie, req->ie_len,
360 mvm->fw->ucode_capa.max_probe_length));
361
362 iwl_mvm_scan_fill_channels(cmd, req, basic_ssid);
363
364 cmd->len = cpu_to_le16(sizeof(struct iwl_scan_cmd) +
365 le16_to_cpu(cmd->tx_cmd.len) +
366 (cmd->channel_count * sizeof(struct iwl_scan_channel)));
367 hcmd.len[0] = le16_to_cpu(cmd->len);
368
369 status = SCAN_RESPONSE_OK;
370 ret = iwl_mvm_send_cmd_status(mvm, &hcmd, &status);
371 if (!ret && status == SCAN_RESPONSE_OK) {
372 IWL_DEBUG_SCAN(mvm, "Scan request was sent successfully\n");
373 } else {
374 /*
375 * If the scan failed, it usually means that the FW was unable
376 * to allocate the time events. Warn on it, but maybe we
377 * should try to send the command again with different params.
378 */
379 IWL_ERR(mvm, "Scan failed! status 0x%x ret %d\n",
380 status, ret);
381 mvm->scan_status = IWL_MVM_SCAN_NONE;
382 ret = -EIO;
383 }
384 return ret;
385 }
386
387 int iwl_mvm_rx_scan_response(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
388 struct iwl_device_cmd *cmd)
389 {
390 struct iwl_rx_packet *pkt = rxb_addr(rxb);
391 struct iwl_cmd_response *resp = (void *)pkt->data;
392
393 IWL_DEBUG_SCAN(mvm, "Scan response received. status 0x%x\n",
394 le32_to_cpu(resp->status));
395 return 0;
396 }
397
398 int iwl_mvm_rx_scan_complete(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
399 struct iwl_device_cmd *cmd)
400 {
401 struct iwl_rx_packet *pkt = rxb_addr(rxb);
402 struct iwl_scan_complete_notif *notif = (void *)pkt->data;
403
404 IWL_DEBUG_SCAN(mvm, "Scan complete: status=0x%x scanned channels=%d\n",
405 notif->status, notif->scanned_channels);
406
407 mvm->scan_status = IWL_MVM_SCAN_NONE;
408 ieee80211_scan_completed(mvm->hw, notif->status != SCAN_COMP_STATUS_OK);
409
410 iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
411
412 return 0;
413 }
414
415 int iwl_mvm_rx_sched_scan_results(struct iwl_mvm *mvm,
416 struct iwl_rx_cmd_buffer *rxb,
417 struct iwl_device_cmd *cmd)
418 {
419 struct iwl_rx_packet *pkt = rxb_addr(rxb);
420 struct iwl_sched_scan_results *notif = (void *)pkt->data;
421
422 if (notif->client_bitmap & SCAN_CLIENT_SCHED_SCAN) {
423 IWL_DEBUG_SCAN(mvm, "Scheduled scan results\n");
424 ieee80211_sched_scan_results(mvm->hw);
425 }
426
427 return 0;
428 }
429
430 static bool iwl_mvm_scan_abort_notif(struct iwl_notif_wait_data *notif_wait,
431 struct iwl_rx_packet *pkt, void *data)
432 {
433 struct iwl_mvm *mvm =
434 container_of(notif_wait, struct iwl_mvm, notif_wait);
435 struct iwl_scan_complete_notif *notif;
436 u32 *resp;
437
438 switch (pkt->hdr.cmd) {
439 case SCAN_ABORT_CMD:
440 resp = (void *)pkt->data;
441 if (*resp == CAN_ABORT_STATUS) {
442 IWL_DEBUG_SCAN(mvm,
443 "Scan can be aborted, wait until completion\n");
444 return false;
445 }
446
447 /*
448 * If scan cannot be aborted, it means that we had a
449 * SCAN_COMPLETE_NOTIFICATION in the pipe and it called
450 * ieee80211_scan_completed already.
451 */
452 IWL_DEBUG_SCAN(mvm, "Scan cannot be aborted, exit now: %d\n",
453 *resp);
454 return true;
455
456 case SCAN_COMPLETE_NOTIFICATION:
457 notif = (void *)pkt->data;
458 IWL_DEBUG_SCAN(mvm, "Scan aborted: status 0x%x\n",
459 notif->status);
460 return true;
461
462 default:
463 WARN_ON(1);
464 return false;
465 };
466 }
467
468 void iwl_mvm_cancel_scan(struct iwl_mvm *mvm)
469 {
470 struct iwl_notification_wait wait_scan_abort;
471 static const u8 scan_abort_notif[] = { SCAN_ABORT_CMD,
472 SCAN_COMPLETE_NOTIFICATION };
473 int ret;
474
475 if (mvm->scan_status == IWL_MVM_SCAN_NONE)
476 return;
477
478 if (iwl_mvm_is_radio_killed(mvm)) {
479 ieee80211_scan_completed(mvm->hw, true);
480 iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
481 mvm->scan_status = IWL_MVM_SCAN_NONE;
482 return;
483 }
484
485 iwl_init_notification_wait(&mvm->notif_wait, &wait_scan_abort,
486 scan_abort_notif,
487 ARRAY_SIZE(scan_abort_notif),
488 iwl_mvm_scan_abort_notif, NULL);
489
490 ret = iwl_mvm_send_cmd_pdu(mvm, SCAN_ABORT_CMD, CMD_SYNC, 0, NULL);
491 if (ret) {
492 IWL_ERR(mvm, "Couldn't send SCAN_ABORT_CMD: %d\n", ret);
493 /* mac80211's state will be cleaned in the nic_restart flow */
494 goto out_remove_notif;
495 }
496
497 ret = iwl_wait_notification(&mvm->notif_wait, &wait_scan_abort, 1 * HZ);
498 if (ret)
499 IWL_ERR(mvm, "%s - failed on timeout\n", __func__);
500
501 return;
502
503 out_remove_notif:
504 iwl_remove_notification(&mvm->notif_wait, &wait_scan_abort);
505 }
506
507 int iwl_mvm_rx_scan_offload_complete_notif(struct iwl_mvm *mvm,
508 struct iwl_rx_cmd_buffer *rxb,
509 struct iwl_device_cmd *cmd)
510 {
511 struct iwl_rx_packet *pkt = rxb_addr(rxb);
512 struct iwl_scan_offload_complete *scan_notif = (void *)pkt->data;
513
514 IWL_DEBUG_SCAN(mvm, "Scheduled scan completed, status %s\n",
515 scan_notif->status == IWL_SCAN_OFFLOAD_COMPLETED ?
516 "completed" : "aborted");
517
518 mvm->scan_status = IWL_MVM_SCAN_NONE;
519 ieee80211_sched_scan_stopped(mvm->hw);
520
521 return 0;
522 }
523
524 static void iwl_scan_offload_build_tx_cmd(struct iwl_mvm *mvm,
525 struct ieee80211_vif *vif,
526 struct ieee80211_sched_scan_ies *ies,
527 enum ieee80211_band band,
528 struct iwl_tx_cmd *cmd,
529 u8 *data)
530 {
531 u16 cmd_len;
532
533 cmd->tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL);
534 cmd->life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
535 cmd->sta_id = mvm->aux_sta.sta_id;
536
537 cmd->rate_n_flags = iwl_mvm_scan_rate_n_flags(mvm, band, false);
538
539 cmd_len = iwl_mvm_fill_probe_req((struct ieee80211_mgmt *)data,
540 vif->addr,
541 1, NULL, 0,
542 ies->ie[band], ies->len[band],
543 SCAN_OFFLOAD_PROBE_REQ_SIZE);
544 cmd->len = cpu_to_le16(cmd_len);
545 }
546
547 static void iwl_build_scan_cmd(struct iwl_mvm *mvm,
548 struct ieee80211_vif *vif,
549 struct cfg80211_sched_scan_request *req,
550 struct iwl_scan_offload_cmd *scan)
551 {
552 bool is_assoc = false;
553
554 ieee80211_iterate_active_interfaces_atomic(mvm->hw,
555 IEEE80211_IFACE_ITER_NORMAL,
556 iwl_mvm_vif_assoc_iterator,
557 &is_assoc);
558 scan->channel_count =
559 mvm->nvm_data->bands[IEEE80211_BAND_2GHZ].n_channels +
560 mvm->nvm_data->bands[IEEE80211_BAND_5GHZ].n_channels;
561 scan->quiet_time = cpu_to_le16(IWL_ACTIVE_QUIET_TIME);
562 scan->quiet_plcp_th = cpu_to_le16(IWL_PLCP_QUIET_THRESH);
563 scan->good_CRC_th = IWL_GOOD_CRC_TH_DEFAULT;
564 scan->rx_chain = iwl_mvm_scan_rx_chain(mvm);
565 scan->max_out_time = iwl_mvm_scan_max_out_time(vif, req->flags,
566 is_assoc);
567 scan->suspend_time = iwl_mvm_scan_suspend_time(vif, is_assoc);
568 scan->filter_flags |= cpu_to_le32(MAC_FILTER_ACCEPT_GRP |
569 MAC_FILTER_IN_BEACON);
570 scan->scan_type = cpu_to_le32(SCAN_TYPE_BACKGROUND);
571 scan->rep_count = cpu_to_le32(1);
572 }
573
574 static int iwl_ssid_exist(u8 *ssid, u8 ssid_len, struct iwl_ssid_ie *ssid_list)
575 {
576 int i;
577
578 for (i = 0; i < PROBE_OPTION_MAX; i++) {
579 if (!ssid_list[i].len)
580 break;
581 if (ssid_list[i].len == ssid_len &&
582 !memcmp(ssid_list->ssid, ssid, ssid_len))
583 return i;
584 }
585 return -1;
586 }
587
588 static void iwl_scan_offload_build_ssid(struct cfg80211_sched_scan_request *req,
589 struct iwl_scan_offload_cmd *scan,
590 u32 *ssid_bitmap)
591 {
592 int i, j;
593 int index;
594
595 /*
596 * copy SSIDs from match list.
597 * iwl_config_sched_scan_profiles() uses the order of these ssids to
598 * config match list.
599 */
600 for (i = 0; i < req->n_match_sets && i < PROBE_OPTION_MAX; i++) {
601 scan->direct_scan[i].id = WLAN_EID_SSID;
602 scan->direct_scan[i].len = req->match_sets[i].ssid.ssid_len;
603 memcpy(scan->direct_scan[i].ssid, req->match_sets[i].ssid.ssid,
604 scan->direct_scan[i].len);
605 }
606
607 /* add SSIDs from scan SSID list */
608 *ssid_bitmap = 0;
609 for (j = 0; j < req->n_ssids && i < PROBE_OPTION_MAX; j++) {
610 index = iwl_ssid_exist(req->ssids[j].ssid,
611 req->ssids[j].ssid_len,
612 scan->direct_scan);
613 if (index < 0) {
614 if (!req->ssids[j].ssid_len)
615 continue;
616 scan->direct_scan[i].id = WLAN_EID_SSID;
617 scan->direct_scan[i].len = req->ssids[j].ssid_len;
618 memcpy(scan->direct_scan[i].ssid, req->ssids[j].ssid,
619 scan->direct_scan[i].len);
620 *ssid_bitmap |= BIT(i + 1);
621 i++;
622 } else {
623 *ssid_bitmap |= BIT(index + 1);
624 }
625 }
626 }
627
628 static void iwl_build_channel_cfg(struct iwl_mvm *mvm,
629 struct cfg80211_sched_scan_request *req,
630 struct iwl_scan_channel_cfg *channels,
631 enum ieee80211_band band,
632 int *head, int *tail,
633 u32 ssid_bitmap)
634 {
635 struct ieee80211_supported_band *s_band;
636 int n_probes = req->n_ssids;
637 int n_channels = req->n_channels;
638 u8 active_dwell, passive_dwell;
639 int i, j, index = 0;
640 bool partial;
641
642 /*
643 * We have to configure all supported channels, even if we don't want to
644 * scan on them, but we have to send channels in the order that we want
645 * to scan. So add requested channels to head of the list and others to
646 * the end.
647 */
648 active_dwell = iwl_mvm_get_active_dwell(band, n_probes);
649 passive_dwell = iwl_mvm_get_passive_dwell(band);
650 s_band = &mvm->nvm_data->bands[band];
651
652 for (i = 0; i < s_band->n_channels && *head <= *tail; i++) {
653 partial = false;
654 for (j = 0; j < n_channels; j++)
655 if (s_band->channels[i].center_freq ==
656 req->channels[j]->center_freq) {
657 index = *head;
658 (*head)++;
659 /*
660 * Channels that came with the request will be
661 * in partial scan .
662 */
663 partial = true;
664 break;
665 }
666 if (!partial) {
667 index = *tail;
668 (*tail)--;
669 }
670 channels->channel_number[index] =
671 cpu_to_le16(ieee80211_frequency_to_channel(
672 s_band->channels[i].center_freq));
673 channels->dwell_time[index][0] = active_dwell;
674 channels->dwell_time[index][1] = passive_dwell;
675
676 channels->iter_count[index] = cpu_to_le16(1);
677 channels->iter_interval[index] = 0;
678
679 if (!(s_band->channels[i].flags & IEEE80211_CHAN_NO_IR))
680 channels->type[index] |=
681 cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_ACTIVE);
682
683 channels->type[index] |=
684 cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_FULL);
685 if (partial)
686 channels->type[index] |=
687 cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_PARTIAL);
688
689 if (s_band->channels[i].flags & IEEE80211_CHAN_NO_HT40)
690 channels->type[index] |=
691 cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_NARROW);
692
693 /* scan for all SSIDs from req->ssids */
694 channels->type[index] |= cpu_to_le32(ssid_bitmap);
695 }
696 }
697
698 int iwl_mvm_config_sched_scan(struct iwl_mvm *mvm,
699 struct ieee80211_vif *vif,
700 struct cfg80211_sched_scan_request *req,
701 struct ieee80211_sched_scan_ies *ies)
702 {
703 int supported_bands = 0;
704 int band_2ghz = mvm->nvm_data->bands[IEEE80211_BAND_2GHZ].n_channels;
705 int band_5ghz = mvm->nvm_data->bands[IEEE80211_BAND_5GHZ].n_channels;
706 int head = 0;
707 int tail = band_2ghz + band_5ghz;
708 u32 ssid_bitmap;
709 int cmd_len;
710 int ret;
711
712 struct iwl_scan_offload_cfg *scan_cfg;
713 struct iwl_host_cmd cmd = {
714 .id = SCAN_OFFLOAD_CONFIG_CMD,
715 .flags = CMD_SYNC,
716 };
717
718 lockdep_assert_held(&mvm->mutex);
719
720 if (band_2ghz)
721 supported_bands++;
722 if (band_5ghz)
723 supported_bands++;
724
725 cmd_len = sizeof(struct iwl_scan_offload_cfg) +
726 supported_bands * SCAN_OFFLOAD_PROBE_REQ_SIZE;
727
728 scan_cfg = kzalloc(cmd_len, GFP_KERNEL);
729 if (!scan_cfg)
730 return -ENOMEM;
731
732 iwl_build_scan_cmd(mvm, vif, req, &scan_cfg->scan_cmd);
733 scan_cfg->scan_cmd.len = cpu_to_le16(cmd_len);
734
735 iwl_scan_offload_build_ssid(req, &scan_cfg->scan_cmd, &ssid_bitmap);
736 /* build tx frames for supported bands */
737 if (band_2ghz) {
738 iwl_scan_offload_build_tx_cmd(mvm, vif, ies,
739 IEEE80211_BAND_2GHZ,
740 &scan_cfg->scan_cmd.tx_cmd[0],
741 scan_cfg->data);
742 iwl_build_channel_cfg(mvm, req, &scan_cfg->channel_cfg,
743 IEEE80211_BAND_2GHZ, &head, &tail,
744 ssid_bitmap);
745 }
746 if (band_5ghz) {
747 iwl_scan_offload_build_tx_cmd(mvm, vif, ies,
748 IEEE80211_BAND_5GHZ,
749 &scan_cfg->scan_cmd.tx_cmd[1],
750 scan_cfg->data +
751 SCAN_OFFLOAD_PROBE_REQ_SIZE);
752 iwl_build_channel_cfg(mvm, req, &scan_cfg->channel_cfg,
753 IEEE80211_BAND_5GHZ, &head, &tail,
754 ssid_bitmap);
755 }
756
757 cmd.data[0] = scan_cfg;
758 cmd.len[0] = cmd_len;
759 cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
760
761 IWL_DEBUG_SCAN(mvm, "Sending scheduled scan config\n");
762
763 ret = iwl_mvm_send_cmd(mvm, &cmd);
764 kfree(scan_cfg);
765 return ret;
766 }
767
768 int iwl_mvm_config_sched_scan_profiles(struct iwl_mvm *mvm,
769 struct cfg80211_sched_scan_request *req)
770 {
771 struct iwl_scan_offload_profile *profile;
772 struct iwl_scan_offload_profile_cfg *profile_cfg;
773 struct iwl_scan_offload_blacklist *blacklist;
774 struct iwl_host_cmd cmd = {
775 .id = SCAN_OFFLOAD_UPDATE_PROFILES_CMD,
776 .flags = CMD_SYNC,
777 .len[1] = sizeof(*profile_cfg),
778 .dataflags[0] = IWL_HCMD_DFL_NOCOPY,
779 .dataflags[1] = IWL_HCMD_DFL_NOCOPY,
780 };
781 int blacklist_len;
782 int i;
783 int ret;
784
785 if (WARN_ON(req->n_match_sets > IWL_SCAN_MAX_PROFILES))
786 return -EIO;
787
788 if (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_SHORT_BL)
789 blacklist_len = IWL_SCAN_SHORT_BLACKLIST_LEN;
790 else
791 blacklist_len = IWL_SCAN_MAX_BLACKLIST_LEN;
792
793 blacklist = kzalloc(sizeof(*blacklist) * blacklist_len, GFP_KERNEL);
794 if (!blacklist)
795 return -ENOMEM;
796
797 profile_cfg = kzalloc(sizeof(*profile_cfg), GFP_KERNEL);
798 if (!profile_cfg) {
799 ret = -ENOMEM;
800 goto free_blacklist;
801 }
802
803 cmd.data[0] = blacklist;
804 cmd.len[0] = sizeof(*blacklist) * blacklist_len;
805 cmd.data[1] = profile_cfg;
806
807 /* No blacklist configuration */
808
809 profile_cfg->num_profiles = req->n_match_sets;
810 profile_cfg->active_clients = SCAN_CLIENT_SCHED_SCAN;
811 profile_cfg->pass_match = SCAN_CLIENT_SCHED_SCAN;
812 profile_cfg->match_notify = SCAN_CLIENT_SCHED_SCAN;
813
814 for (i = 0; i < req->n_match_sets; i++) {
815 profile = &profile_cfg->profiles[i];
816 profile->ssid_index = i;
817 /* Support any cipher and auth algorithm */
818 profile->unicast_cipher = 0xff;
819 profile->auth_alg = 0xff;
820 profile->network_type = IWL_NETWORK_TYPE_ANY;
821 profile->band_selection = IWL_SCAN_OFFLOAD_SELECT_ANY;
822 profile->client_bitmap = SCAN_CLIENT_SCHED_SCAN;
823 }
824
825 IWL_DEBUG_SCAN(mvm, "Sending scheduled scan profile config\n");
826
827 ret = iwl_mvm_send_cmd(mvm, &cmd);
828 kfree(profile_cfg);
829 free_blacklist:
830 kfree(blacklist);
831
832 return ret;
833 }
834
835 int iwl_mvm_sched_scan_start(struct iwl_mvm *mvm,
836 struct cfg80211_sched_scan_request *req)
837 {
838 struct iwl_scan_offload_req scan_req = {
839 .watchdog = IWL_SCHED_SCAN_WATCHDOG,
840
841 .schedule_line[0].iterations = IWL_FAST_SCHED_SCAN_ITERATIONS,
842 .schedule_line[0].delay = req->interval / 1000,
843 .schedule_line[0].full_scan_mul = 1,
844
845 .schedule_line[1].iterations = 0xff,
846 .schedule_line[1].delay = req->interval / 1000,
847 .schedule_line[1].full_scan_mul = IWL_FULL_SCAN_MULTIPLIER,
848 };
849
850 if (req->n_match_sets && req->match_sets[0].ssid.ssid_len) {
851 IWL_DEBUG_SCAN(mvm,
852 "Sending scheduled scan with filtering, filter len %d\n",
853 req->n_match_sets);
854 } else {
855 IWL_DEBUG_SCAN(mvm,
856 "Sending Scheduled scan without filtering\n");
857 scan_req.flags |= cpu_to_le16(IWL_SCAN_OFFLOAD_FLAG_PASS_ALL);
858 }
859
860 return iwl_mvm_send_cmd_pdu(mvm, SCAN_OFFLOAD_REQUEST_CMD, CMD_SYNC,
861 sizeof(scan_req), &scan_req);
862 }
863
864 static int iwl_mvm_send_sched_scan_abort(struct iwl_mvm *mvm)
865 {
866 int ret;
867 struct iwl_host_cmd cmd = {
868 .id = SCAN_OFFLOAD_ABORT_CMD,
869 .flags = CMD_SYNC,
870 };
871 u32 status;
872
873 /* Exit instantly with error when device is not ready
874 * to receive scan abort command or it does not perform
875 * scheduled scan currently */
876 if (mvm->scan_status != IWL_MVM_SCAN_SCHED)
877 return -EIO;
878
879 ret = iwl_mvm_send_cmd_status(mvm, &cmd, &status);
880 if (ret)
881 return ret;
882
883 if (status != CAN_ABORT_STATUS) {
884 /*
885 * The scan abort will return 1 for success or
886 * 2 for "failure". A failure condition can be
887 * due to simply not being in an active scan which
888 * can occur if we send the scan abort before the
889 * microcode has notified us that a scan is completed.
890 */
891 IWL_DEBUG_SCAN(mvm, "SCAN OFFLOAD ABORT ret %d.\n", status);
892 ret = -EIO;
893 }
894
895 return ret;
896 }
897
898 void iwl_mvm_sched_scan_stop(struct iwl_mvm *mvm)
899 {
900 int ret;
901
902 lockdep_assert_held(&mvm->mutex);
903
904 if (mvm->scan_status != IWL_MVM_SCAN_SCHED) {
905 IWL_DEBUG_SCAN(mvm, "No offloaded scan to stop\n");
906 return;
907 }
908
909 ret = iwl_mvm_send_sched_scan_abort(mvm);
910 if (ret)
911 IWL_DEBUG_SCAN(mvm, "Send stop offload scan failed %d\n", ret);
912 else
913 IWL_DEBUG_SCAN(mvm, "Successfully sent stop offload scan\n");
914 }
Linux kernel - Deliverables
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