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 <ilw@linux.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 /* check if scan was requested from mac80211 */
98 if (priv->scan_request) {
99 IWL_DEBUG_SCAN(priv, "Complete scan in mac80211\n");
100 ieee80211_scan_completed(priv->hw, aborted);
103 priv->scan_type = IWL_SCAN_NORMAL;
104 priv->scan_vif = NULL;
105 priv->scan_request = NULL;
108 static void iwl_process_scan_complete(struct iwl_priv *priv)
112 lockdep_assert_held(&priv->mutex);
114 if (!test_and_clear_bit(STATUS_SCAN_COMPLETE, &priv->status))
117 IWL_DEBUG_SCAN(priv, "Completed scan.\n");
119 cancel_delayed_work(&priv->scan_check);
121 aborted = test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->status);
123 IWL_DEBUG_SCAN(priv, "Aborted scan completed.\n");
125 if (!test_and_clear_bit(STATUS_SCANNING, &priv->status)) {
126 IWL_DEBUG_SCAN(priv, "Scan already completed.\n");
130 if (priv->scan_type != IWL_SCAN_NORMAL && !aborted) {
133 /* Check if mac80211 requested scan during our internal scan */
134 if (priv->scan_request == NULL)
137 /* If so request a new scan */
138 err = iwl_scan_initiate(priv, priv->scan_vif, IWL_SCAN_NORMAL,
139 priv->scan_request->channels[0]->band);
142 "failed to initiate pending scan: %d\n", err);
151 iwl_complete_scan(priv, aborted);
154 /* Can we still talk to firmware ? */
155 if (!iwl_is_ready_rf(priv))
158 iwlagn_post_scan(priv);
161 void iwl_force_scan_end(struct iwl_priv *priv)
163 lockdep_assert_held(&priv->mutex);
165 if (!test_bit(STATUS_SCANNING, &priv->status)) {
166 IWL_DEBUG_SCAN(priv, "Forcing scan end while not scanning\n");
170 IWL_DEBUG_SCAN(priv, "Forcing scan end\n");
171 clear_bit(STATUS_SCANNING, &priv->status);
172 clear_bit(STATUS_SCAN_HW, &priv->status);
173 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
174 clear_bit(STATUS_SCAN_COMPLETE, &priv->status);
175 iwl_complete_scan(priv, true);
178 static void iwl_do_scan_abort(struct iwl_priv *priv)
182 lockdep_assert_held(&priv->mutex);
184 if (!test_bit(STATUS_SCANNING, &priv->status)) {
185 IWL_DEBUG_SCAN(priv, "Not performing scan to abort\n");
189 if (test_and_set_bit(STATUS_SCAN_ABORTING, &priv->status)) {
190 IWL_DEBUG_SCAN(priv, "Scan abort in progress\n");
194 ret = iwl_send_scan_abort(priv);
196 IWL_DEBUG_SCAN(priv, "Send scan abort failed %d\n", ret);
197 iwl_force_scan_end(priv);
199 IWL_DEBUG_SCAN(priv, "Successfully send scan abort\n");
203 * iwl_scan_cancel - Cancel any currently executing HW scan
205 int iwl_scan_cancel(struct iwl_priv *priv)
207 IWL_DEBUG_SCAN(priv, "Queuing abort scan\n");
208 queue_work(priv->workqueue, &priv->abort_scan);
213 * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
214 * @ms: amount of time to wait (in milliseconds) for scan to abort
217 void iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
219 unsigned long timeout = jiffies + msecs_to_jiffies(ms);
221 lockdep_assert_held(&priv->mutex);
223 IWL_DEBUG_SCAN(priv, "Scan cancel timeout\n");
225 iwl_do_scan_abort(priv);
227 while (time_before_eq(jiffies, timeout)) {
228 if (!test_bit(STATUS_SCAN_HW, &priv->status))
237 * Now STATUS_SCAN_HW is clear. This means that the
238 * device finished, but the background work is going
239 * to execute at best as soon as we release the mutex.
240 * Since we need to be able to issue a new scan right
241 * after this function returns, run the complete here.
242 * The STATUS_SCAN_COMPLETE bit will then be cleared
243 * and prevent the background work from "completing"
244 * a possible new scan.
246 iwl_process_scan_complete(priv);
249 /* Service response to REPLY_SCAN_CMD (0x80) */
250 static int iwl_rx_reply_scan(struct iwl_priv *priv,
251 struct iwl_rx_cmd_buffer *rxb,
252 struct iwl_device_cmd *cmd)
254 #ifdef CONFIG_IWLWIFI_DEBUG
255 struct iwl_rx_packet *pkt = rxb_addr(rxb);
256 struct iwl_scanreq_notification *notif = (void *)pkt->data;
258 IWL_DEBUG_SCAN(priv, "Scan request status = 0x%x\n", notif->status);
263 /* Service SCAN_START_NOTIFICATION (0x82) */
264 static int iwl_rx_scan_start_notif(struct iwl_priv *priv,
265 struct iwl_rx_cmd_buffer *rxb,
266 struct iwl_device_cmd *cmd)
268 struct iwl_rx_packet *pkt = rxb_addr(rxb);
269 struct iwl_scanstart_notification *notif = (void *)pkt->data;
271 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
272 IWL_DEBUG_SCAN(priv, "Scan start: "
274 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
276 notif->band ? "bg" : "a",
277 le32_to_cpu(notif->tsf_high),
278 le32_to_cpu(notif->tsf_low),
279 notif->status, notif->beacon_timer);
284 /* Service SCAN_RESULTS_NOTIFICATION (0x83) */
285 static int iwl_rx_scan_results_notif(struct iwl_priv *priv,
286 struct iwl_rx_cmd_buffer *rxb,
287 struct iwl_device_cmd *cmd)
289 #ifdef CONFIG_IWLWIFI_DEBUG
290 struct iwl_rx_packet *pkt = rxb_addr(rxb);
291 struct iwl_scanresults_notification *notif = (void *)pkt->data;
293 IWL_DEBUG_SCAN(priv, "Scan ch.res: "
295 "probe status: %u:%u "
296 "(TSF: 0x%08X:%08X) - %d "
297 "elapsed=%lu usec\n",
299 notif->band ? "bg" : "a",
300 notif->probe_status, notif->num_probe_not_sent,
301 le32_to_cpu(notif->tsf_high),
302 le32_to_cpu(notif->tsf_low),
303 le32_to_cpu(notif->statistics[0]),
304 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf);
309 /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
310 static int iwl_rx_scan_complete_notif(struct iwl_priv *priv,
311 struct iwl_rx_cmd_buffer *rxb,
312 struct iwl_device_cmd *cmd)
314 struct iwl_rx_packet *pkt = rxb_addr(rxb);
315 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->data;
317 IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
318 scan_notif->scanned_channels,
320 scan_notif->tsf_high, scan_notif->status);
322 IWL_DEBUG_SCAN(priv, "Scan on %sGHz took %dms\n",
323 (priv->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2",
324 jiffies_to_msecs(jiffies - priv->scan_start));
327 * When aborting, we run the scan completed background work inline
328 * and the background work must then do nothing. The SCAN_COMPLETE
329 * bit helps implement that logic and thus needs to be set before
330 * queueing the work. Also, since the scan abort waits for SCAN_HW
331 * to clear, we need to set SCAN_COMPLETE before clearing SCAN_HW
332 * to avoid a race there.
334 set_bit(STATUS_SCAN_COMPLETE, &priv->status);
335 clear_bit(STATUS_SCAN_HW, &priv->status);
336 queue_work(priv->workqueue, &priv->scan_completed);
338 if (priv->iw_mode != NL80211_IFTYPE_ADHOC &&
339 iwl_advanced_bt_coexist(priv) &&
340 priv->bt_status != scan_notif->bt_status) {
341 if (scan_notif->bt_status) {
343 if (!priv->bt_ch_announce)
344 priv->bt_traffic_load =
345 IWL_BT_COEX_TRAFFIC_LOAD_HIGH;
347 * otherwise, no traffic load information provided
352 priv->bt_traffic_load =
353 IWL_BT_COEX_TRAFFIC_LOAD_NONE;
355 priv->bt_status = scan_notif->bt_status;
356 queue_work(priv->workqueue,
357 &priv->bt_traffic_change_work);
362 void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
365 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
366 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
367 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
368 iwl_rx_scan_results_notif;
369 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
370 iwl_rx_scan_complete_notif;
373 static u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
374 enum ieee80211_band band, u8 n_probes)
376 if (band == IEEE80211_BAND_5GHZ)
377 return IWL_ACTIVE_DWELL_TIME_52 +
378 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
380 return IWL_ACTIVE_DWELL_TIME_24 +
381 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
384 static u16 iwl_limit_dwell(struct iwl_priv *priv, u16 dwell_time)
386 struct iwl_rxon_context *ctx;
387 int limits[NUM_IWL_RXON_CTX] = {};
391 BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
394 * If we're associated, we clamp the dwell time 98%
395 * of the beacon interval (minus 2 * channel tune time)
396 * If both contexts are active, we have to restrict to
397 * 1/2 of the minimum of them, because they might be in
398 * lock-step with the time inbetween only half of what
399 * time we'd have in each of them.
401 for_each_context(priv, ctx) {
402 switch (ctx->staging.dev_type) {
403 case RXON_DEV_TYPE_P2P:
404 /* no timing constraints */
406 case RXON_DEV_TYPE_ESS:
408 /* timing constraints if associated */
409 if (!iwl_is_associated_ctx(ctx))
412 case RXON_DEV_TYPE_CP:
413 case RXON_DEV_TYPE_2STA:
415 * These seem to always have timers for TBTT
416 * active in uCode even when not associated yet.
421 limits[n_active++] = ctx->beacon_int ?: IWL_PASSIVE_DWELL_BASE;
428 limit = (limits[1] * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
430 dwell_time = min(limit, dwell_time);
431 /* fall through to limit further */
433 limit = (limits[0] * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
435 return min(limit, dwell_time);
442 static u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
443 enum ieee80211_band band)
445 u16 passive = (band == IEEE80211_BAND_2GHZ) ?
446 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
447 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
449 return iwl_limit_dwell(priv, passive);
452 /* Return valid, unused, channel for a passive scan to reset the RF */
453 static u8 iwl_get_single_channel_number(struct iwl_priv *priv,
454 enum ieee80211_band band)
456 struct ieee80211_supported_band *sband = priv->hw->wiphy->bands[band];
457 struct iwl_rxon_context *ctx;
460 for (i = 0; i < sband->n_channels; i++) {
463 for_each_context(priv, ctx) {
464 busy = sband->channels[i].hw_value ==
465 le16_to_cpu(ctx->staging.channel);
473 if (!(sband->channels[i].flags & IEEE80211_CHAN_DISABLED))
474 return sband->channels[i].hw_value;
480 static int iwl_get_channel_for_reset_scan(struct iwl_priv *priv,
481 struct ieee80211_vif *vif,
482 enum ieee80211_band band,
483 struct iwl_scan_channel *scan_ch)
485 const struct ieee80211_supported_band *sband;
488 sband = iwl_get_hw_mode(priv, band);
490 IWL_ERR(priv, "invalid band\n");
494 channel = iwl_get_single_channel_number(priv, band);
496 scan_ch->channel = cpu_to_le16(channel);
497 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
498 scan_ch->active_dwell =
499 cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME);
500 scan_ch->passive_dwell =
501 cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME);
502 /* Set txpower levels to defaults */
503 scan_ch->dsp_atten = 110;
504 if (band == IEEE80211_BAND_5GHZ)
505 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
507 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
511 IWL_ERR(priv, "no valid channel found\n");
515 static int iwl_get_channels_for_scan(struct iwl_priv *priv,
516 struct ieee80211_vif *vif,
517 enum ieee80211_band band,
518 u8 is_active, u8 n_probes,
519 struct iwl_scan_channel *scan_ch)
521 struct ieee80211_channel *chan;
522 const struct ieee80211_supported_band *sband;
523 u16 passive_dwell = 0;
524 u16 active_dwell = 0;
528 sband = iwl_get_hw_mode(priv, band);
532 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
533 passive_dwell = iwl_get_passive_dwell_time(priv, band);
535 if (passive_dwell <= active_dwell)
536 passive_dwell = active_dwell + 1;
538 for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) {
539 chan = priv->scan_request->channels[i];
541 if (chan->band != band)
544 channel = chan->hw_value;
545 scan_ch->channel = cpu_to_le16(channel);
547 if (!is_active || (chan->flags & IEEE80211_CHAN_NO_IR))
548 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
550 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
553 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
555 scan_ch->active_dwell = cpu_to_le16(active_dwell);
556 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
558 /* Set txpower levels to defaults */
559 scan_ch->dsp_atten = 110;
561 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
563 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
565 if (band == IEEE80211_BAND_5GHZ)
566 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
568 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
570 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n",
571 channel, le32_to_cpu(scan_ch->type),
572 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
573 "ACTIVE" : "PASSIVE",
574 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
575 active_dwell : passive_dwell);
581 IWL_DEBUG_SCAN(priv, "total channels to scan %d\n", added);
586 * iwl_fill_probe_req - fill in all required fields and IE for probe request
589 static u16 iwl_fill_probe_req(struct ieee80211_mgmt *frame, const u8 *ta,
590 const u8 *ies, int ie_len, const u8 *ssid,
591 u8 ssid_len, int left)
596 /* Make sure there is enough space for the probe request,
597 * two mandatory IEs and the data */
602 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
603 eth_broadcast_addr(frame->da);
604 memcpy(frame->sa, ta, ETH_ALEN);
605 eth_broadcast_addr(frame->bssid);
611 pos = &frame->u.probe_req.variable[0];
613 /* fill in our SSID IE */
614 left -= ssid_len + 2;
617 *pos++ = WLAN_EID_SSID;
619 if (ssid && ssid_len) {
620 memcpy(pos, ssid, ssid_len);
626 if (WARN_ON(left < ie_len))
630 memcpy(pos, ies, ie_len);
637 static int iwlagn_request_scan(struct iwl_priv *priv, struct ieee80211_vif *vif)
639 struct iwl_host_cmd cmd = {
640 .id = REPLY_SCAN_CMD,
641 .len = { sizeof(struct iwl_scan_cmd), },
643 struct iwl_scan_cmd *scan;
644 struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
648 enum ieee80211_band band;
650 u8 rx_ant = priv->nvm_data->valid_rx_ant;
652 bool is_active = false;
655 u8 scan_tx_antennas = priv->nvm_data->valid_tx_ant;
657 int scan_cmd_size = sizeof(struct iwl_scan_cmd) +
658 MAX_SCAN_CHANNEL * sizeof(struct iwl_scan_channel) +
659 priv->fw->ucode_capa.max_probe_length;
660 const u8 *ssid = NULL;
663 if (WARN_ON(priv->scan_type == IWL_SCAN_NORMAL &&
664 (!priv->scan_request ||
665 priv->scan_request->n_channels > MAX_SCAN_CHANNEL)))
668 lockdep_assert_held(&priv->mutex);
671 ctx = iwl_rxon_ctx_from_vif(vif);
673 if (!priv->scan_cmd) {
674 priv->scan_cmd = kmalloc(scan_cmd_size, GFP_KERNEL);
675 if (!priv->scan_cmd) {
677 "fail to allocate memory for scan\n");
681 scan = priv->scan_cmd;
682 memset(scan, 0, scan_cmd_size);
684 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
685 scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
687 if (iwl_is_any_associated(priv)) {
690 u32 suspend_time = 100;
691 u32 scan_suspend_time = 100;
693 IWL_DEBUG_INFO(priv, "Scanning while associated...\n");
694 switch (priv->scan_type) {
695 case IWL_SCAN_RADIO_RESET:
698 case IWL_SCAN_NORMAL:
699 interval = vif->bss_conf.beacon_int;
703 scan->suspend_time = 0;
704 scan->max_out_time = cpu_to_le32(200 * 1024);
706 interval = suspend_time;
708 extra = (suspend_time / interval) << 22;
709 scan_suspend_time = (extra |
710 ((suspend_time % interval) * 1024));
711 scan->suspend_time = cpu_to_le32(scan_suspend_time);
712 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n",
713 scan_suspend_time, interval);
716 switch (priv->scan_type) {
717 case IWL_SCAN_RADIO_RESET:
718 IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n");
720 * Override quiet time as firmware checks that active
721 * dwell is >= quiet; since we use passive scan it'll
722 * not actually be used.
724 scan->quiet_time = cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME);
726 case IWL_SCAN_NORMAL:
727 if (priv->scan_request->n_ssids) {
729 IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
731 * The highest priority SSID is inserted to the
732 * probe request template.
734 ssid_len = priv->scan_request->ssids[0].ssid_len;
735 ssid = priv->scan_request->ssids[0].ssid;
738 * Invert the order of ssids, the firmware will invert
741 for (i = priv->scan_request->n_ssids - 1; i >= 1; i--) {
742 scan->direct_scan[p].id = WLAN_EID_SSID;
743 scan->direct_scan[p].len =
744 priv->scan_request->ssids[i].ssid_len;
745 memcpy(scan->direct_scan[p].ssid,
746 priv->scan_request->ssids[i].ssid,
747 priv->scan_request->ssids[i].ssid_len);
753 IWL_DEBUG_SCAN(priv, "Start passive scan.\n");
757 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
758 scan->tx_cmd.sta_id = ctx->bcast_sta_id;
759 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
761 switch (priv->scan_band) {
762 case IEEE80211_BAND_2GHZ:
763 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
764 chan_mod = le32_to_cpu(
765 priv->contexts[IWL_RXON_CTX_BSS].active.flags &
766 RXON_FLG_CHANNEL_MODE_MSK)
767 >> RXON_FLG_CHANNEL_MODE_POS;
768 if ((priv->scan_request && priv->scan_request->no_cck) ||
769 chan_mod == CHANNEL_MODE_PURE_40) {
770 rate = IWL_RATE_6M_PLCP;
772 rate = IWL_RATE_1M_PLCP;
773 rate_flags = RATE_MCS_CCK_MSK;
776 * Internal scans are passive, so we can indiscriminately set
777 * the BT ignore flag on 2.4 GHz since it applies to TX only.
779 if (priv->lib->bt_params &&
780 priv->lib->bt_params->advanced_bt_coexist)
781 scan->tx_cmd.tx_flags |= TX_CMD_FLG_IGNORE_BT;
783 case IEEE80211_BAND_5GHZ:
784 rate = IWL_RATE_6M_PLCP;
787 IWL_WARN(priv, "Invalid scan band\n");
792 * If active scanning is requested but a certain channel is
793 * marked passive, we can do active scanning if we detect
796 * There is an issue with some firmware versions that triggers
797 * a sysassert on a "good CRC threshold" of zero (== disabled),
798 * on a radar channel even though this means that we should NOT
801 * The "good CRC threshold" is the number of frames that we
802 * need to receive during our dwell time on a channel before
803 * sending out probes -- setting this to a huge value will
804 * mean we never reach it, but at the same time work around
805 * the aforementioned issue. Thus use IWL_GOOD_CRC_TH_NEVER
806 * here instead of IWL_GOOD_CRC_TH_DISABLED.
808 * This was fixed in later versions along with some other
809 * scan changes, and the threshold behaves as a flag in those
812 if (priv->new_scan_threshold_behaviour)
813 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
814 IWL_GOOD_CRC_TH_DISABLED;
816 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
817 IWL_GOOD_CRC_TH_NEVER;
819 band = priv->scan_band;
821 if (band == IEEE80211_BAND_2GHZ &&
822 priv->lib->bt_params &&
823 priv->lib->bt_params->advanced_bt_coexist) {
824 /* transmit 2.4 GHz probes only on first antenna */
825 scan_tx_antennas = first_antenna(scan_tx_antennas);
828 priv->scan_tx_ant[band] = iwl_toggle_tx_ant(priv,
829 priv->scan_tx_ant[band],
831 rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]);
832 scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags);
835 * In power save mode while associated use one chain,
836 * otherwise use all chains
838 if (test_bit(STATUS_POWER_PMI, &priv->status) &&
839 !(priv->hw->conf.flags & IEEE80211_CONF_IDLE)) {
840 /* rx_ant has been set to all valid chains previously */
841 active_chains = rx_ant &
842 ((u8)(priv->chain_noise_data.active_chains));
844 active_chains = rx_ant;
846 IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n",
847 priv->chain_noise_data.active_chains);
849 rx_ant = first_antenna(active_chains);
851 if (priv->lib->bt_params &&
852 priv->lib->bt_params->advanced_bt_coexist &&
853 priv->bt_full_concurrent) {
854 /* operated as 1x1 in full concurrency mode */
855 rx_ant = first_antenna(rx_ant);
858 /* MIMO is not used here, but value is required */
860 priv->nvm_data->valid_rx_ant << RXON_RX_CHAIN_VALID_POS;
861 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS;
862 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS;
863 rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS;
864 scan->rx_chain = cpu_to_le16(rx_chain);
865 switch (priv->scan_type) {
866 case IWL_SCAN_NORMAL:
867 cmd_len = iwl_fill_probe_req(
868 (struct ieee80211_mgmt *)scan->data,
870 priv->scan_request->ie,
871 priv->scan_request->ie_len,
873 scan_cmd_size - sizeof(*scan));
875 case IWL_SCAN_RADIO_RESET:
876 /* use bcast addr, will not be transmitted but must be valid */
877 cmd_len = iwl_fill_probe_req(
878 (struct ieee80211_mgmt *)scan->data,
879 iwl_bcast_addr, NULL, 0,
881 scan_cmd_size - sizeof(*scan));
886 scan->tx_cmd.len = cpu_to_le16(cmd_len);
888 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
889 RXON_FILTER_BCON_AWARE_MSK);
891 switch (priv->scan_type) {
892 case IWL_SCAN_RADIO_RESET:
893 scan->channel_count =
894 iwl_get_channel_for_reset_scan(priv, vif, band,
895 (void *)&scan->data[cmd_len]);
897 case IWL_SCAN_NORMAL:
898 scan->channel_count =
899 iwl_get_channels_for_scan(priv, vif, band,
901 (void *)&scan->data[cmd_len]);
905 if (scan->channel_count == 0) {
906 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
910 cmd.len[0] += le16_to_cpu(scan->tx_cmd.len) +
911 scan->channel_count * sizeof(struct iwl_scan_channel);
913 cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
914 scan->len = cpu_to_le16(cmd.len[0]);
916 /* set scan bit here for PAN params */
917 set_bit(STATUS_SCAN_HW, &priv->status);
919 ret = iwlagn_set_pan_params(priv);
921 clear_bit(STATUS_SCAN_HW, &priv->status);
925 ret = iwl_dvm_send_cmd(priv, &cmd);
927 clear_bit(STATUS_SCAN_HW, &priv->status);
928 iwlagn_set_pan_params(priv);
934 void iwl_init_scan_params(struct iwl_priv *priv)
936 u8 ant_idx = fls(priv->nvm_data->valid_tx_ant) - 1;
937 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
938 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
939 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
940 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
943 int __must_check iwl_scan_initiate(struct iwl_priv *priv,
944 struct ieee80211_vif *vif,
945 enum iwl_scan_type scan_type,
946 enum ieee80211_band band)
950 lockdep_assert_held(&priv->mutex);
952 cancel_delayed_work(&priv->scan_check);
954 if (!iwl_is_ready_rf(priv)) {
955 IWL_WARN(priv, "Request scan called when driver not ready.\n");
959 if (test_bit(STATUS_SCAN_HW, &priv->status)) {
961 "Multiple concurrent scan requests in parallel.\n");
965 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
966 IWL_DEBUG_SCAN(priv, "Scan request while abort pending.\n");
970 IWL_DEBUG_SCAN(priv, "Starting %sscan...\n",
971 scan_type == IWL_SCAN_NORMAL ? "" :
974 set_bit(STATUS_SCANNING, &priv->status);
975 priv->scan_type = scan_type;
976 priv->scan_start = jiffies;
977 priv->scan_band = band;
979 ret = iwlagn_request_scan(priv, vif);
981 clear_bit(STATUS_SCANNING, &priv->status);
982 priv->scan_type = IWL_SCAN_NORMAL;
986 queue_delayed_work(priv->workqueue, &priv->scan_check,
987 IWL_SCAN_CHECK_WATCHDOG);
994 * internal short scan, this function should only been called while associated.
995 * It will reset and tune the radio to prevent possible RF related problem
997 void iwl_internal_short_hw_scan(struct iwl_priv *priv)
999 queue_work(priv->workqueue, &priv->start_internal_scan);
1002 static void iwl_bg_start_internal_scan(struct work_struct *work)
1004 struct iwl_priv *priv =
1005 container_of(work, struct iwl_priv, start_internal_scan);
1007 IWL_DEBUG_SCAN(priv, "Start internal scan\n");
1009 mutex_lock(&priv->mutex);
1011 if (priv->scan_type == IWL_SCAN_RADIO_RESET) {
1012 IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n");
1016 if (test_bit(STATUS_SCANNING, &priv->status)) {
1017 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
1021 if (iwl_scan_initiate(priv, NULL, IWL_SCAN_RADIO_RESET, priv->band))
1022 IWL_DEBUG_SCAN(priv, "failed to start internal short scan\n");
1024 mutex_unlock(&priv->mutex);
1027 static void iwl_bg_scan_check(struct work_struct *data)
1029 struct iwl_priv *priv =
1030 container_of(data, struct iwl_priv, scan_check.work);
1032 IWL_DEBUG_SCAN(priv, "Scan check work\n");
1034 /* Since we are here firmware does not finish scan and
1035 * most likely is in bad shape, so we don't bother to
1036 * send abort command, just force scan complete to mac80211 */
1037 mutex_lock(&priv->mutex);
1038 iwl_force_scan_end(priv);
1039 mutex_unlock(&priv->mutex);
1042 static void iwl_bg_abort_scan(struct work_struct *work)
1044 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
1046 IWL_DEBUG_SCAN(priv, "Abort scan work\n");
1048 /* We keep scan_check work queued in case when firmware will not
1049 * report back scan completed notification */
1050 mutex_lock(&priv->mutex);
1051 iwl_scan_cancel_timeout(priv, 200);
1052 mutex_unlock(&priv->mutex);
1055 static void iwl_bg_scan_completed(struct work_struct *work)
1057 struct iwl_priv *priv =
1058 container_of(work, struct iwl_priv, scan_completed);
1060 mutex_lock(&priv->mutex);
1061 iwl_process_scan_complete(priv);
1062 mutex_unlock(&priv->mutex);
1065 void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
1067 INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
1068 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
1069 INIT_WORK(&priv->start_internal_scan, iwl_bg_start_internal_scan);
1070 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
1073 void iwl_cancel_scan_deferred_work(struct iwl_priv *priv)
1075 cancel_work_sync(&priv->start_internal_scan);
1076 cancel_work_sync(&priv->abort_scan);
1077 cancel_work_sync(&priv->scan_completed);
1079 if (cancel_delayed_work_sync(&priv->scan_check)) {
1080 mutex_lock(&priv->mutex);
1081 iwl_force_scan_end(priv);
1082 mutex_unlock(&priv->mutex);