1 /******************************************************************************
5 * Copyright(c) 2008 - 2014 Intel Corporation. All rights reserved.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of version 2 of the GNU General Public License as
9 * published by the Free Software Foundation.
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
21 * The full GNU General Public License is included in this distribution
22 * in the file called COPYING.
24 * Contact Information:
25 * Intel Linux Wireless <linuxwifi@intel.com>
26 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
27 *****************************************************************************/
28 #include <linux/slab.h>
29 #include <linux/types.h>
30 #include <linux/etherdevice.h>
31 #include <net/mac80211.h>
36 /* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
37 * sending probe req. This should be set long enough to hear probe responses
38 * from more than one AP. */
39 #define IWL_ACTIVE_DWELL_TIME_24 (30) /* all times in msec */
40 #define IWL_ACTIVE_DWELL_TIME_52 (20)
42 #define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3)
43 #define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2)
45 /* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
46 * Must be set longer than active dwell time.
47 * For the most reliable scan, set > AP beacon interval (typically 100msec). */
48 #define IWL_PASSIVE_DWELL_TIME_24 (20) /* all times in msec */
49 #define IWL_PASSIVE_DWELL_TIME_52 (10)
50 #define IWL_PASSIVE_DWELL_BASE (100)
51 #define IWL_CHANNEL_TUNE_TIME 5
52 #define MAX_SCAN_CHANNEL 50
54 /* For reset radio, need minimal dwell time only */
55 #define IWL_RADIO_RESET_DWELL_TIME 5
57 static int iwl_send_scan_abort(struct iwl_priv *priv)
60 struct iwl_host_cmd cmd = {
61 .id = REPLY_SCAN_ABORT_CMD,
62 .flags = CMD_WANT_SKB,
66 /* Exit instantly with error when device is not ready
67 * to receive scan abort command or it does not perform
68 * hardware scan currently */
69 if (!test_bit(STATUS_READY, &priv->status) ||
70 !test_bit(STATUS_SCAN_HW, &priv->status) ||
71 test_bit(STATUS_FW_ERROR, &priv->status))
74 ret = iwl_dvm_send_cmd(priv, &cmd);
78 status = (void *)cmd.resp_pkt->data;
79 if (*status != CAN_ABORT_STATUS) {
80 /* The scan abort will return 1 for success or
81 * 2 for "failure". A failure condition can be
82 * due to simply not being in an active scan which
83 * can occur if we send the scan abort before we
84 * the microcode has notified us that a scan is
86 IWL_DEBUG_SCAN(priv, "SCAN_ABORT ret %d.\n",
87 le32_to_cpu(*status));
95 static void iwl_complete_scan(struct iwl_priv *priv, bool aborted)
97 struct cfg80211_scan_info info = {
101 /* check if scan was requested from mac80211 */
102 if (priv->scan_request) {
103 IWL_DEBUG_SCAN(priv, "Complete scan in mac80211\n");
104 ieee80211_scan_completed(priv->hw, &info);
107 priv->scan_type = IWL_SCAN_NORMAL;
108 priv->scan_vif = NULL;
109 priv->scan_request = NULL;
112 static void iwl_process_scan_complete(struct iwl_priv *priv)
116 lockdep_assert_held(&priv->mutex);
118 if (!test_and_clear_bit(STATUS_SCAN_COMPLETE, &priv->status))
121 IWL_DEBUG_SCAN(priv, "Completed scan.\n");
123 cancel_delayed_work(&priv->scan_check);
125 aborted = test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->status);
127 IWL_DEBUG_SCAN(priv, "Aborted scan completed.\n");
129 if (!test_and_clear_bit(STATUS_SCANNING, &priv->status)) {
130 IWL_DEBUG_SCAN(priv, "Scan already completed.\n");
134 if (priv->scan_type != IWL_SCAN_NORMAL && !aborted) {
137 /* Check if mac80211 requested scan during our internal scan */
138 if (priv->scan_request == NULL)
141 /* If so request a new scan */
142 err = iwl_scan_initiate(priv, priv->scan_vif, IWL_SCAN_NORMAL,
143 priv->scan_request->channels[0]->band);
146 "failed to initiate pending scan: %d\n", err);
155 iwl_complete_scan(priv, aborted);
158 /* Can we still talk to firmware ? */
159 if (!iwl_is_ready_rf(priv))
162 iwlagn_post_scan(priv);
165 void iwl_force_scan_end(struct iwl_priv *priv)
167 lockdep_assert_held(&priv->mutex);
169 if (!test_bit(STATUS_SCANNING, &priv->status)) {
170 IWL_DEBUG_SCAN(priv, "Forcing scan end while not scanning\n");
174 IWL_DEBUG_SCAN(priv, "Forcing scan end\n");
175 clear_bit(STATUS_SCANNING, &priv->status);
176 clear_bit(STATUS_SCAN_HW, &priv->status);
177 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
178 clear_bit(STATUS_SCAN_COMPLETE, &priv->status);
179 iwl_complete_scan(priv, true);
182 static void iwl_do_scan_abort(struct iwl_priv *priv)
186 lockdep_assert_held(&priv->mutex);
188 if (!test_bit(STATUS_SCANNING, &priv->status)) {
189 IWL_DEBUG_SCAN(priv, "Not performing scan to abort\n");
193 if (test_and_set_bit(STATUS_SCAN_ABORTING, &priv->status)) {
194 IWL_DEBUG_SCAN(priv, "Scan abort in progress\n");
198 ret = iwl_send_scan_abort(priv);
200 IWL_DEBUG_SCAN(priv, "Send scan abort failed %d\n", ret);
201 iwl_force_scan_end(priv);
203 IWL_DEBUG_SCAN(priv, "Successfully send scan abort\n");
207 * iwl_scan_cancel - Cancel any currently executing HW scan
209 int iwl_scan_cancel(struct iwl_priv *priv)
211 IWL_DEBUG_SCAN(priv, "Queuing abort scan\n");
212 queue_work(priv->workqueue, &priv->abort_scan);
217 * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
218 * @ms: amount of time to wait (in milliseconds) for scan to abort
221 void iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
223 unsigned long timeout = jiffies + msecs_to_jiffies(ms);
225 lockdep_assert_held(&priv->mutex);
227 IWL_DEBUG_SCAN(priv, "Scan cancel timeout\n");
229 iwl_do_scan_abort(priv);
231 while (time_before_eq(jiffies, timeout)) {
232 if (!test_bit(STATUS_SCAN_HW, &priv->status))
241 * Now STATUS_SCAN_HW is clear. This means that the
242 * device finished, but the background work is going
243 * to execute at best as soon as we release the mutex.
244 * Since we need to be able to issue a new scan right
245 * after this function returns, run the complete here.
246 * The STATUS_SCAN_COMPLETE bit will then be cleared
247 * and prevent the background work from "completing"
248 * a possible new scan.
250 iwl_process_scan_complete(priv);
253 /* Service response to REPLY_SCAN_CMD (0x80) */
254 static void iwl_rx_reply_scan(struct iwl_priv *priv,
255 struct iwl_rx_cmd_buffer *rxb)
257 #ifdef CONFIG_IWLWIFI_DEBUG
258 struct iwl_rx_packet *pkt = rxb_addr(rxb);
259 struct iwl_scanreq_notification *notif = (void *)pkt->data;
261 IWL_DEBUG_SCAN(priv, "Scan request status = 0x%x\n", notif->status);
265 /* Service SCAN_START_NOTIFICATION (0x82) */
266 static void iwl_rx_scan_start_notif(struct iwl_priv *priv,
267 struct iwl_rx_cmd_buffer *rxb)
269 struct iwl_rx_packet *pkt = rxb_addr(rxb);
270 struct iwl_scanstart_notification *notif = (void *)pkt->data;
272 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
273 IWL_DEBUG_SCAN(priv, "Scan start: "
275 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
277 notif->band ? "bg" : "a",
278 le32_to_cpu(notif->tsf_high),
279 le32_to_cpu(notif->tsf_low),
280 notif->status, notif->beacon_timer);
283 /* Service SCAN_RESULTS_NOTIFICATION (0x83) */
284 static void iwl_rx_scan_results_notif(struct iwl_priv *priv,
285 struct iwl_rx_cmd_buffer *rxb)
287 #ifdef CONFIG_IWLWIFI_DEBUG
288 struct iwl_rx_packet *pkt = rxb_addr(rxb);
289 struct iwl_scanresults_notification *notif = (void *)pkt->data;
291 IWL_DEBUG_SCAN(priv, "Scan ch.res: "
293 "probe status: %u:%u "
294 "(TSF: 0x%08X:%08X) - %d "
295 "elapsed=%lu usec\n",
297 notif->band ? "bg" : "a",
298 notif->probe_status, notif->num_probe_not_sent,
299 le32_to_cpu(notif->tsf_high),
300 le32_to_cpu(notif->tsf_low),
301 le32_to_cpu(notif->statistics[0]),
302 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf);
306 /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
307 static void iwl_rx_scan_complete_notif(struct iwl_priv *priv,
308 struct iwl_rx_cmd_buffer *rxb)
310 struct iwl_rx_packet *pkt = rxb_addr(rxb);
311 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->data;
313 IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
314 scan_notif->scanned_channels,
316 scan_notif->tsf_high, scan_notif->status);
318 IWL_DEBUG_SCAN(priv, "Scan on %sGHz took %dms\n",
319 (priv->scan_band == NL80211_BAND_2GHZ) ? "2.4" : "5.2",
320 jiffies_to_msecs(jiffies - priv->scan_start));
323 * When aborting, we run the scan completed background work inline
324 * and the background work must then do nothing. The SCAN_COMPLETE
325 * bit helps implement that logic and thus needs to be set before
326 * queueing the work. Also, since the scan abort waits for SCAN_HW
327 * to clear, we need to set SCAN_COMPLETE before clearing SCAN_HW
328 * to avoid a race there.
330 set_bit(STATUS_SCAN_COMPLETE, &priv->status);
331 clear_bit(STATUS_SCAN_HW, &priv->status);
332 queue_work(priv->workqueue, &priv->scan_completed);
334 if (priv->iw_mode != NL80211_IFTYPE_ADHOC &&
335 iwl_advanced_bt_coexist(priv) &&
336 priv->bt_status != scan_notif->bt_status) {
337 if (scan_notif->bt_status) {
339 if (!priv->bt_ch_announce)
340 priv->bt_traffic_load =
341 IWL_BT_COEX_TRAFFIC_LOAD_HIGH;
343 * otherwise, no traffic load information provided
348 priv->bt_traffic_load =
349 IWL_BT_COEX_TRAFFIC_LOAD_NONE;
351 priv->bt_status = scan_notif->bt_status;
352 queue_work(priv->workqueue,
353 &priv->bt_traffic_change_work);
357 void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
360 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
361 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
362 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
363 iwl_rx_scan_results_notif;
364 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
365 iwl_rx_scan_complete_notif;
368 static u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
369 enum nl80211_band band, u8 n_probes)
371 if (band == NL80211_BAND_5GHZ)
372 return IWL_ACTIVE_DWELL_TIME_52 +
373 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
375 return IWL_ACTIVE_DWELL_TIME_24 +
376 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
379 static u16 iwl_limit_dwell(struct iwl_priv *priv, u16 dwell_time)
381 struct iwl_rxon_context *ctx;
382 int limits[NUM_IWL_RXON_CTX] = {};
386 BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
389 * If we're associated, we clamp the dwell time 98%
390 * of the beacon interval (minus 2 * channel tune time)
391 * If both contexts are active, we have to restrict to
392 * 1/2 of the minimum of them, because they might be in
393 * lock-step with the time inbetween only half of what
394 * time we'd have in each of them.
396 for_each_context(priv, ctx) {
397 switch (ctx->staging.dev_type) {
398 case RXON_DEV_TYPE_P2P:
399 /* no timing constraints */
401 case RXON_DEV_TYPE_ESS:
403 /* timing constraints if associated */
404 if (!iwl_is_associated_ctx(ctx))
407 case RXON_DEV_TYPE_CP:
408 case RXON_DEV_TYPE_2STA:
410 * These seem to always have timers for TBTT
411 * active in uCode even when not associated yet.
416 limits[n_active++] = ctx->beacon_int ?: IWL_PASSIVE_DWELL_BASE;
423 limit = (limits[1] * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
425 dwell_time = min(limit, dwell_time);
426 /* fall through to limit further */
428 limit = (limits[0] * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
430 return min(limit, dwell_time);
437 static u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
438 enum nl80211_band band)
440 u16 passive = (band == NL80211_BAND_2GHZ) ?
441 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
442 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
444 return iwl_limit_dwell(priv, passive);
447 /* Return valid, unused, channel for a passive scan to reset the RF */
448 static u8 iwl_get_single_channel_number(struct iwl_priv *priv,
449 enum nl80211_band band)
451 struct ieee80211_supported_band *sband = priv->hw->wiphy->bands[band];
452 struct iwl_rxon_context *ctx;
455 for (i = 0; i < sband->n_channels; i++) {
458 for_each_context(priv, ctx) {
459 busy = sband->channels[i].hw_value ==
460 le16_to_cpu(ctx->staging.channel);
468 if (!(sband->channels[i].flags & IEEE80211_CHAN_DISABLED))
469 return sband->channels[i].hw_value;
475 static int iwl_get_channel_for_reset_scan(struct iwl_priv *priv,
476 struct ieee80211_vif *vif,
477 enum nl80211_band band,
478 struct iwl_scan_channel *scan_ch)
480 const struct ieee80211_supported_band *sband;
483 sband = iwl_get_hw_mode(priv, band);
485 IWL_ERR(priv, "invalid band\n");
489 channel = iwl_get_single_channel_number(priv, band);
491 scan_ch->channel = cpu_to_le16(channel);
492 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
493 scan_ch->active_dwell =
494 cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME);
495 scan_ch->passive_dwell =
496 cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME);
497 /* Set txpower levels to defaults */
498 scan_ch->dsp_atten = 110;
499 if (band == NL80211_BAND_5GHZ)
500 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
502 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
506 IWL_ERR(priv, "no valid channel found\n");
510 static int iwl_get_channels_for_scan(struct iwl_priv *priv,
511 struct ieee80211_vif *vif,
512 enum nl80211_band band,
513 u8 is_active, u8 n_probes,
514 struct iwl_scan_channel *scan_ch)
516 struct ieee80211_channel *chan;
517 const struct ieee80211_supported_band *sband;
518 u16 passive_dwell = 0;
519 u16 active_dwell = 0;
523 sband = iwl_get_hw_mode(priv, band);
527 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
528 passive_dwell = iwl_get_passive_dwell_time(priv, band);
530 if (passive_dwell <= active_dwell)
531 passive_dwell = active_dwell + 1;
533 for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) {
534 chan = priv->scan_request->channels[i];
536 if (chan->band != band)
539 channel = chan->hw_value;
540 scan_ch->channel = cpu_to_le16(channel);
542 if (!is_active || (chan->flags & IEEE80211_CHAN_NO_IR))
543 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
545 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
548 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
550 scan_ch->active_dwell = cpu_to_le16(active_dwell);
551 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
553 /* Set txpower levels to defaults */
554 scan_ch->dsp_atten = 110;
556 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
558 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
560 if (band == NL80211_BAND_5GHZ)
561 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
563 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
565 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n",
566 channel, le32_to_cpu(scan_ch->type),
567 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
568 "ACTIVE" : "PASSIVE",
569 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
570 active_dwell : passive_dwell);
576 IWL_DEBUG_SCAN(priv, "total channels to scan %d\n", added);
581 * iwl_fill_probe_req - fill in all required fields and IE for probe request
584 static u16 iwl_fill_probe_req(struct ieee80211_mgmt *frame, const u8 *ta,
585 const u8 *ies, int ie_len, const u8 *ssid,
586 u8 ssid_len, int left)
591 /* Make sure there is enough space for the probe request,
592 * two mandatory IEs and the data */
597 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
598 eth_broadcast_addr(frame->da);
599 memcpy(frame->sa, ta, ETH_ALEN);
600 eth_broadcast_addr(frame->bssid);
606 pos = &frame->u.probe_req.variable[0];
608 /* fill in our SSID IE */
609 left -= ssid_len + 2;
612 *pos++ = WLAN_EID_SSID;
614 if (ssid && ssid_len) {
615 memcpy(pos, ssid, ssid_len);
621 if (WARN_ON(left < ie_len))
625 memcpy(pos, ies, ie_len);
632 static int iwlagn_request_scan(struct iwl_priv *priv, struct ieee80211_vif *vif)
634 struct iwl_host_cmd cmd = {
635 .id = REPLY_SCAN_CMD,
636 .len = { sizeof(struct iwl_scan_cmd), },
638 struct iwl_scan_cmd *scan;
639 struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
643 enum nl80211_band band;
645 u8 rx_ant = priv->nvm_data->valid_rx_ant;
647 bool is_active = false;
650 u8 scan_tx_antennas = priv->nvm_data->valid_tx_ant;
652 int scan_cmd_size = sizeof(struct iwl_scan_cmd) +
653 MAX_SCAN_CHANNEL * sizeof(struct iwl_scan_channel) +
654 priv->fw->ucode_capa.max_probe_length;
655 const u8 *ssid = NULL;
658 if (WARN_ON(priv->scan_type == IWL_SCAN_NORMAL &&
659 (!priv->scan_request ||
660 priv->scan_request->n_channels > MAX_SCAN_CHANNEL)))
663 lockdep_assert_held(&priv->mutex);
666 ctx = iwl_rxon_ctx_from_vif(vif);
668 if (!priv->scan_cmd) {
669 priv->scan_cmd = kmalloc(scan_cmd_size, GFP_KERNEL);
670 if (!priv->scan_cmd) {
672 "fail to allocate memory for scan\n");
676 scan = priv->scan_cmd;
677 memset(scan, 0, scan_cmd_size);
679 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
680 scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
682 if (iwl_is_any_associated(priv)) {
685 u32 suspend_time = 100;
686 u32 scan_suspend_time = 100;
688 IWL_DEBUG_INFO(priv, "Scanning while associated...\n");
689 switch (priv->scan_type) {
690 case IWL_SCAN_RADIO_RESET:
693 case IWL_SCAN_NORMAL:
694 interval = vif->bss_conf.beacon_int;
698 scan->suspend_time = 0;
699 scan->max_out_time = cpu_to_le32(200 * 1024);
701 interval = suspend_time;
703 extra = (suspend_time / interval) << 22;
704 scan_suspend_time = (extra |
705 ((suspend_time % interval) * 1024));
706 scan->suspend_time = cpu_to_le32(scan_suspend_time);
707 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n",
708 scan_suspend_time, interval);
711 switch (priv->scan_type) {
712 case IWL_SCAN_RADIO_RESET:
713 IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n");
715 * Override quiet time as firmware checks that active
716 * dwell is >= quiet; since we use passive scan it'll
717 * not actually be used.
719 scan->quiet_time = cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME);
721 case IWL_SCAN_NORMAL:
722 if (priv->scan_request->n_ssids) {
724 IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
726 * The highest priority SSID is inserted to the
727 * probe request template.
729 ssid_len = priv->scan_request->ssids[0].ssid_len;
730 ssid = priv->scan_request->ssids[0].ssid;
733 * Invert the order of ssids, the firmware will invert
736 for (i = priv->scan_request->n_ssids - 1; i >= 1; i--) {
737 scan->direct_scan[p].id = WLAN_EID_SSID;
738 scan->direct_scan[p].len =
739 priv->scan_request->ssids[i].ssid_len;
740 memcpy(scan->direct_scan[p].ssid,
741 priv->scan_request->ssids[i].ssid,
742 priv->scan_request->ssids[i].ssid_len);
748 IWL_DEBUG_SCAN(priv, "Start passive scan.\n");
752 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
753 scan->tx_cmd.sta_id = ctx->bcast_sta_id;
754 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
756 switch (priv->scan_band) {
757 case NL80211_BAND_2GHZ:
758 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
759 chan_mod = le32_to_cpu(
760 priv->contexts[IWL_RXON_CTX_BSS].active.flags &
761 RXON_FLG_CHANNEL_MODE_MSK)
762 >> RXON_FLG_CHANNEL_MODE_POS;
763 if ((priv->scan_request && priv->scan_request->no_cck) ||
764 chan_mod == CHANNEL_MODE_PURE_40) {
765 rate = IWL_RATE_6M_PLCP;
767 rate = IWL_RATE_1M_PLCP;
768 rate_flags = RATE_MCS_CCK_MSK;
771 * Internal scans are passive, so we can indiscriminately set
772 * the BT ignore flag on 2.4 GHz since it applies to TX only.
774 if (priv->lib->bt_params &&
775 priv->lib->bt_params->advanced_bt_coexist)
776 scan->tx_cmd.tx_flags |= TX_CMD_FLG_IGNORE_BT;
778 case NL80211_BAND_5GHZ:
779 rate = IWL_RATE_6M_PLCP;
782 IWL_WARN(priv, "Invalid scan band\n");
787 * If active scanning is requested but a certain channel is
788 * marked passive, we can do active scanning if we detect
791 * There is an issue with some firmware versions that triggers
792 * a sysassert on a "good CRC threshold" of zero (== disabled),
793 * on a radar channel even though this means that we should NOT
796 * The "good CRC threshold" is the number of frames that we
797 * need to receive during our dwell time on a channel before
798 * sending out probes -- setting this to a huge value will
799 * mean we never reach it, but at the same time work around
800 * the aforementioned issue. Thus use IWL_GOOD_CRC_TH_NEVER
801 * here instead of IWL_GOOD_CRC_TH_DISABLED.
803 * This was fixed in later versions along with some other
804 * scan changes, and the threshold behaves as a flag in those
807 if (priv->new_scan_threshold_behaviour)
808 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
809 IWL_GOOD_CRC_TH_DISABLED;
811 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
812 IWL_GOOD_CRC_TH_NEVER;
814 band = priv->scan_band;
816 if (band == NL80211_BAND_2GHZ &&
817 priv->lib->bt_params &&
818 priv->lib->bt_params->advanced_bt_coexist) {
819 /* transmit 2.4 GHz probes only on first antenna */
820 scan_tx_antennas = first_antenna(scan_tx_antennas);
823 priv->scan_tx_ant[band] = iwl_toggle_tx_ant(priv,
824 priv->scan_tx_ant[band],
826 rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]);
827 scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags);
830 * In power save mode while associated use one chain,
831 * otherwise use all chains
833 if (test_bit(STATUS_POWER_PMI, &priv->status) &&
834 !(priv->hw->conf.flags & IEEE80211_CONF_IDLE)) {
835 /* rx_ant has been set to all valid chains previously */
836 active_chains = rx_ant &
837 ((u8)(priv->chain_noise_data.active_chains));
839 active_chains = rx_ant;
841 IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n",
842 priv->chain_noise_data.active_chains);
844 rx_ant = first_antenna(active_chains);
846 if (priv->lib->bt_params &&
847 priv->lib->bt_params->advanced_bt_coexist &&
848 priv->bt_full_concurrent) {
849 /* operated as 1x1 in full concurrency mode */
850 rx_ant = first_antenna(rx_ant);
853 /* MIMO is not used here, but value is required */
855 priv->nvm_data->valid_rx_ant << RXON_RX_CHAIN_VALID_POS;
856 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS;
857 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS;
858 rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS;
859 scan->rx_chain = cpu_to_le16(rx_chain);
860 switch (priv->scan_type) {
861 case IWL_SCAN_NORMAL:
862 cmd_len = iwl_fill_probe_req(
863 (struct ieee80211_mgmt *)scan->data,
865 priv->scan_request->ie,
866 priv->scan_request->ie_len,
868 scan_cmd_size - sizeof(*scan));
870 case IWL_SCAN_RADIO_RESET:
871 /* use bcast addr, will not be transmitted but must be valid */
872 cmd_len = iwl_fill_probe_req(
873 (struct ieee80211_mgmt *)scan->data,
874 iwl_bcast_addr, NULL, 0,
876 scan_cmd_size - sizeof(*scan));
881 scan->tx_cmd.len = cpu_to_le16(cmd_len);
883 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
884 RXON_FILTER_BCON_AWARE_MSK);
886 switch (priv->scan_type) {
887 case IWL_SCAN_RADIO_RESET:
888 scan->channel_count =
889 iwl_get_channel_for_reset_scan(priv, vif, band,
890 (void *)&scan->data[cmd_len]);
892 case IWL_SCAN_NORMAL:
893 scan->channel_count =
894 iwl_get_channels_for_scan(priv, vif, band,
896 (void *)&scan->data[cmd_len]);
900 if (scan->channel_count == 0) {
901 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
905 cmd.len[0] += le16_to_cpu(scan->tx_cmd.len) +
906 scan->channel_count * sizeof(struct iwl_scan_channel);
908 cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
909 scan->len = cpu_to_le16(cmd.len[0]);
911 /* set scan bit here for PAN params */
912 set_bit(STATUS_SCAN_HW, &priv->status);
914 ret = iwlagn_set_pan_params(priv);
916 clear_bit(STATUS_SCAN_HW, &priv->status);
920 ret = iwl_dvm_send_cmd(priv, &cmd);
922 clear_bit(STATUS_SCAN_HW, &priv->status);
923 iwlagn_set_pan_params(priv);
929 void iwl_init_scan_params(struct iwl_priv *priv)
931 u8 ant_idx = fls(priv->nvm_data->valid_tx_ant) - 1;
932 if (!priv->scan_tx_ant[NL80211_BAND_5GHZ])
933 priv->scan_tx_ant[NL80211_BAND_5GHZ] = ant_idx;
934 if (!priv->scan_tx_ant[NL80211_BAND_2GHZ])
935 priv->scan_tx_ant[NL80211_BAND_2GHZ] = ant_idx;
938 int __must_check iwl_scan_initiate(struct iwl_priv *priv,
939 struct ieee80211_vif *vif,
940 enum iwl_scan_type scan_type,
941 enum nl80211_band band)
945 lockdep_assert_held(&priv->mutex);
947 cancel_delayed_work(&priv->scan_check);
949 if (!iwl_is_ready_rf(priv)) {
950 IWL_WARN(priv, "Request scan called when driver not ready.\n");
954 if (test_bit(STATUS_SCAN_HW, &priv->status)) {
956 "Multiple concurrent scan requests in parallel.\n");
960 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
961 IWL_DEBUG_SCAN(priv, "Scan request while abort pending.\n");
965 IWL_DEBUG_SCAN(priv, "Starting %sscan...\n",
966 scan_type == IWL_SCAN_NORMAL ? "" :
969 set_bit(STATUS_SCANNING, &priv->status);
970 priv->scan_type = scan_type;
971 priv->scan_start = jiffies;
972 priv->scan_band = band;
974 ret = iwlagn_request_scan(priv, vif);
976 clear_bit(STATUS_SCANNING, &priv->status);
977 priv->scan_type = IWL_SCAN_NORMAL;
981 queue_delayed_work(priv->workqueue, &priv->scan_check,
982 IWL_SCAN_CHECK_WATCHDOG);
989 * internal short scan, this function should only been called while associated.
990 * It will reset and tune the radio to prevent possible RF related problem
992 void iwl_internal_short_hw_scan(struct iwl_priv *priv)
994 queue_work(priv->workqueue, &priv->start_internal_scan);
997 static void iwl_bg_start_internal_scan(struct work_struct *work)
999 struct iwl_priv *priv =
1000 container_of(work, struct iwl_priv, start_internal_scan);
1002 IWL_DEBUG_SCAN(priv, "Start internal scan\n");
1004 mutex_lock(&priv->mutex);
1006 if (priv->scan_type == IWL_SCAN_RADIO_RESET) {
1007 IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n");
1011 if (test_bit(STATUS_SCANNING, &priv->status)) {
1012 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
1016 if (iwl_scan_initiate(priv, NULL, IWL_SCAN_RADIO_RESET, priv->band))
1017 IWL_DEBUG_SCAN(priv, "failed to start internal short scan\n");
1019 mutex_unlock(&priv->mutex);
1022 static void iwl_bg_scan_check(struct work_struct *data)
1024 struct iwl_priv *priv =
1025 container_of(data, struct iwl_priv, scan_check.work);
1027 IWL_DEBUG_SCAN(priv, "Scan check work\n");
1029 /* Since we are here firmware does not finish scan and
1030 * most likely is in bad shape, so we don't bother to
1031 * send abort command, just force scan complete to mac80211 */
1032 mutex_lock(&priv->mutex);
1033 iwl_force_scan_end(priv);
1034 mutex_unlock(&priv->mutex);
1037 static void iwl_bg_abort_scan(struct work_struct *work)
1039 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
1041 IWL_DEBUG_SCAN(priv, "Abort scan work\n");
1043 /* We keep scan_check work queued in case when firmware will not
1044 * report back scan completed notification */
1045 mutex_lock(&priv->mutex);
1046 iwl_scan_cancel_timeout(priv, 200);
1047 mutex_unlock(&priv->mutex);
1050 static void iwl_bg_scan_completed(struct work_struct *work)
1052 struct iwl_priv *priv =
1053 container_of(work, struct iwl_priv, scan_completed);
1055 mutex_lock(&priv->mutex);
1056 iwl_process_scan_complete(priv);
1057 mutex_unlock(&priv->mutex);
1060 void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
1062 INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
1063 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
1064 INIT_WORK(&priv->start_internal_scan, iwl_bg_start_internal_scan);
1065 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
1068 void iwl_cancel_scan_deferred_work(struct iwl_priv *priv)
1070 cancel_work_sync(&priv->start_internal_scan);
1071 cancel_work_sync(&priv->abort_scan);
1072 cancel_work_sync(&priv->scan_completed);
1074 if (cancel_delayed_work_sync(&priv->scan_check)) {
1075 mutex_lock(&priv->mutex);
1076 iwl_force_scan_end(priv);
1077 mutex_unlock(&priv->mutex);