scan.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * This file is part of wl1271
  4 *
  5 * Copyright (C) 2009-2010 Nokia Corporation
  6 *
  7 * Contact: Luciano Coelho <luciano.coelho@nokia.com>
  8 */
  9
 10#include <linux/ieee80211.h>
 11#include <linux/pm_runtime.h>
 12
 13#include "wlcore.h"
 14#include "debug.h"
 15#include "cmd.h"
 16#include "scan.h"
 17#include "acx.h"
 18#include "tx.h"
 19
 20void wl1271_scan_complete_work(struct work_struct *work)
 21{
 22	struct delayed_work *dwork;
 23	struct wl1271 *wl;
 24	struct wl12xx_vif *wlvif;
 25	struct cfg80211_scan_info info = {
 26		.aborted = false,
 27	};
 28	int ret;
 29
 30	dwork = to_delayed_work(work);
 31	wl = container_of(dwork, struct wl1271, scan_complete_work);
 32
 33	wl1271_debug(DEBUG_SCAN, "Scanning complete");
 34
 35	mutex_lock(&wl->mutex);
 36
 37	if (unlikely(wl->state != WLCORE_STATE_ON))
 38		goto out;
 39
 40	if (wl->scan.state == WL1271_SCAN_STATE_IDLE)
 41		goto out;
 42
 43	wlvif = wl->scan_wlvif;
 44
 45	/*
 46	 * Rearm the tx watchdog just before idling scan. This
 47	 * prevents just-finished scans from triggering the watchdog
 48	 */
 49	wl12xx_rearm_tx_watchdog_locked(wl);
 50
 51	wl->scan.state = WL1271_SCAN_STATE_IDLE;
 52	memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));
 53	wl->scan.req = NULL;
 54	wl->scan_wlvif = NULL;
 55
 56	ret = pm_runtime_resume_and_get(wl->dev);
 57	if (ret < 0)
 58		goto out;
 59
 60	if (test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags)) {
 61		/* restore hardware connection monitoring template */
 62		wl1271_cmd_build_ap_probe_req(wl, wlvif, wlvif->probereq);
 63	}
 64
 65	if (wl->scan.failed) {
 66		wl1271_info("Scan completed due to error.");
 67		wl12xx_queue_recovery_work(wl);
 68	}
 69
 70	wlcore_cmd_regdomain_config_locked(wl);
 71
 72	pm_runtime_put_autosuspend(wl->dev);
 73
 74	ieee80211_scan_completed(wl->hw, &info);
 75
 76out:
 77	mutex_unlock(&wl->mutex);
 78
 79}
 80
 81static void wlcore_started_vifs_iter(void *data, u8 *mac,
 82				     struct ieee80211_vif *vif)
 83{
 84	struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
 85	bool active = false;
 86	int *count = (int *)data;
 87
 88	/*
 89	 * count active interfaces according to interface type.
 90	 * checking only bss_conf.idle is bad for some cases, e.g.
 91	 * we don't want to count sta in p2p_find as active interface.
 92	 */
 93	switch (wlvif->bss_type) {
 94	case BSS_TYPE_STA_BSS:
 95		if (test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags))
 96			active = true;
 97		break;
 98
 99	case BSS_TYPE_AP_BSS:
100		if (wlvif->wl->active_sta_count > 0)
101			active = true;
102		break;
103
104	default:
105		break;
106	}
107
108	if (active)
109		(*count)++;
110}
111
112static int wlcore_count_started_vifs(struct wl1271 *wl)
113{
114	int count = 0;
115
116	ieee80211_iterate_active_interfaces_atomic(wl->hw,
117					IEEE80211_IFACE_ITER_RESUME_ALL,
118					wlcore_started_vifs_iter, &count);
119	return count;
120}
121
122static int
123wlcore_scan_get_channels(struct wl1271 *wl,
124			 struct ieee80211_channel *req_channels[],
125			 u32 n_channels,
126			 u32 n_ssids,
127			 struct conn_scan_ch_params *channels,
128			 u32 band, bool radar, bool passive,
129			 int start, int max_channels,
130			 u8 *n_pactive_ch,
131			 int scan_type)
132{
133	int i, j;
134	u32 flags;
135	bool force_passive = !n_ssids;
136	u32 min_dwell_time_active, max_dwell_time_active;
137	u32 dwell_time_passive, dwell_time_dfs;
138
139	/* configure dwell times according to scan type */
140	if (scan_type == SCAN_TYPE_SEARCH) {
141		struct conf_scan_settings *c = &wl->conf.scan;
142		bool active_vif_exists = !!wlcore_count_started_vifs(wl);
143
144		min_dwell_time_active = active_vif_exists ?
145			c->min_dwell_time_active :
146			c->min_dwell_time_active_long;
147		max_dwell_time_active = active_vif_exists ?
148			c->max_dwell_time_active :
149			c->max_dwell_time_active_long;
150		dwell_time_passive = c->dwell_time_passive;
151		dwell_time_dfs = c->dwell_time_dfs;
152	} else {
153		struct conf_sched_scan_settings *c = &wl->conf.sched_scan;
154		u32 delta_per_probe;
155
156		if (band == NL80211_BAND_5GHZ)
157			delta_per_probe = c->dwell_time_delta_per_probe_5;
158		else
159			delta_per_probe = c->dwell_time_delta_per_probe;
160
161		min_dwell_time_active = c->base_dwell_time +
162			 n_ssids * c->num_probe_reqs * delta_per_probe;
163
164		max_dwell_time_active = min_dwell_time_active +
165					c->max_dwell_time_delta;
166		dwell_time_passive = c->dwell_time_passive;
167		dwell_time_dfs = c->dwell_time_dfs;
168	}
169	min_dwell_time_active = DIV_ROUND_UP(min_dwell_time_active, 1000);
170	max_dwell_time_active = DIV_ROUND_UP(max_dwell_time_active, 1000);
171	dwell_time_passive = DIV_ROUND_UP(dwell_time_passive, 1000);
172	dwell_time_dfs = DIV_ROUND_UP(dwell_time_dfs, 1000);
173
174	for (i = 0, j = start;
175	     i < n_channels && j < max_channels;
176	     i++) {
177		flags = req_channels[i]->flags;
178
179		if (force_passive)
180			flags |= IEEE80211_CHAN_NO_IR;
181
182		if ((req_channels[i]->band == band) &&
183		    !(flags & IEEE80211_CHAN_DISABLED) &&
184		    (!!(flags & IEEE80211_CHAN_RADAR) == radar) &&
185		    /* if radar is set, we ignore the passive flag */
186		    (radar ||
187		     !!(flags & IEEE80211_CHAN_NO_IR) == passive)) {
188			if (flags & IEEE80211_CHAN_RADAR) {
189				channels[j].flags |= SCAN_CHANNEL_FLAGS_DFS;
190
191				channels[j].passive_duration =
192					cpu_to_le16(dwell_time_dfs);
193			} else {
194				channels[j].passive_duration =
195					cpu_to_le16(dwell_time_passive);
196			}
197
198			channels[j].min_duration =
199				cpu_to_le16(min_dwell_time_active);
200			channels[j].max_duration =
201				cpu_to_le16(max_dwell_time_active);
202
203			channels[j].tx_power_att = req_channels[i]->max_power;
204			channels[j].channel = req_channels[i]->hw_value;
205
206			if (n_pactive_ch &&
207			    (band == NL80211_BAND_2GHZ) &&
208			    (channels[j].channel >= 12) &&
209			    (channels[j].channel <= 14) &&
210			    (flags & IEEE80211_CHAN_NO_IR) &&
211			    !force_passive) {
212				/* pactive channels treated as DFS */
213				channels[j].flags = SCAN_CHANNEL_FLAGS_DFS;
214
215				/*
216				 * n_pactive_ch is counted down from the end of
217				 * the passive channel list
218				 */
219				(*n_pactive_ch)++;
220				wl1271_debug(DEBUG_SCAN, "n_pactive_ch = %d",
221					     *n_pactive_ch);
222			}
223
224			wl1271_debug(DEBUG_SCAN, "freq %d, ch. %d, flags 0x%x, power %d, min/max_dwell %d/%d%s%s",
225				     req_channels[i]->center_freq,
226				     req_channels[i]->hw_value,
227				     req_channels[i]->flags,
228				     req_channels[i]->max_power,
229				     min_dwell_time_active,
230				     max_dwell_time_active,
231				     flags & IEEE80211_CHAN_RADAR ?
232					", DFS" : "",
233				     flags & IEEE80211_CHAN_NO_IR ?
234					", NO-IR" : "");
235			j++;
236		}
237	}
238
239	return j - start;
240}
241
242bool
243wlcore_set_scan_chan_params(struct wl1271 *wl,
244			    struct wlcore_scan_channels *cfg,
245			    struct ieee80211_channel *channels[],
246			    u32 n_channels,
247			    u32 n_ssids,
248			    int scan_type)
249{
250	u8 n_pactive_ch = 0;
251
252	cfg->passive[0] =
253		wlcore_scan_get_channels(wl,
254					 channels,
255					 n_channels,
256					 n_ssids,
257					 cfg->channels_2,
258					 NL80211_BAND_2GHZ,
259					 false, true, 0,
260					 MAX_CHANNELS_2GHZ,
261					 &n_pactive_ch,
262					 scan_type);
263	cfg->active[0] =
264		wlcore_scan_get_channels(wl,
265					 channels,
266					 n_channels,
267					 n_ssids,
268					 cfg->channels_2,
269					 NL80211_BAND_2GHZ,
270					 false, false,
271					 cfg->passive[0],
272					 MAX_CHANNELS_2GHZ,
273					 &n_pactive_ch,
274					 scan_type);
275	cfg->passive[1] =
276		wlcore_scan_get_channels(wl,
277					 channels,
278					 n_channels,
279					 n_ssids,
280					 cfg->channels_5,
281					 NL80211_BAND_5GHZ,
282					 false, true, 0,
283					 wl->max_channels_5,
284					 &n_pactive_ch,
285					 scan_type);
286	cfg->dfs =
287		wlcore_scan_get_channels(wl,
288					 channels,
289					 n_channels,
290					 n_ssids,
291					 cfg->channels_5,
292					 NL80211_BAND_5GHZ,
293					 true, true,
294					 cfg->passive[1],
295					 wl->max_channels_5,
296					 &n_pactive_ch,
297					 scan_type);
298	cfg->active[1] =
299		wlcore_scan_get_channels(wl,
300					 channels,
301					 n_channels,
302					 n_ssids,
303					 cfg->channels_5,
304					 NL80211_BAND_5GHZ,
305					 false, false,
306					 cfg->passive[1] + cfg->dfs,
307					 wl->max_channels_5,
308					 &n_pactive_ch,
309					 scan_type);
310
311	/* 802.11j channels are not supported yet */
312	cfg->passive[2] = 0;
313	cfg->active[2] = 0;
314
315	cfg->passive_active = n_pactive_ch;
316
317	wl1271_debug(DEBUG_SCAN, "    2.4GHz: active %d passive %d",
318		     cfg->active[0], cfg->passive[0]);
319	wl1271_debug(DEBUG_SCAN, "    5GHz: active %d passive %d",
320		     cfg->active[1], cfg->passive[1]);
321	wl1271_debug(DEBUG_SCAN, "    DFS: %d", cfg->dfs);
322
323	return  cfg->passive[0] || cfg->active[0] ||
324		cfg->passive[1] || cfg->active[1] || cfg->dfs ||
325		cfg->passive[2] || cfg->active[2];
326}
327EXPORT_SYMBOL_GPL(wlcore_set_scan_chan_params);
328
329int wlcore_scan(struct wl1271 *wl, struct ieee80211_vif *vif,
330		const u8 *ssid, size_t ssid_len,
331		struct cfg80211_scan_request *req)
332{
333	struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
334
335	/*
336	 * cfg80211 should guarantee that we don't get more channels
337	 * than what we have registered.
338	 */
339	BUG_ON(req->n_channels > WL1271_MAX_CHANNELS);
340
341	if (wl->scan.state != WL1271_SCAN_STATE_IDLE)
342		return -EBUSY;
343
344	wl->scan.state = WL1271_SCAN_STATE_2GHZ_ACTIVE;
345
346	if (ssid_len && ssid) {
347		wl->scan.ssid_len = ssid_len;
348		memcpy(wl->scan.ssid, ssid, ssid_len);
349	} else {
350		wl->scan.ssid_len = 0;
351	}
352
353	wl->scan_wlvif = wlvif;
354	wl->scan.req = req;
355	memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));
356
357	/* we assume failure so that timeout scenarios are handled correctly */
358	wl->scan.failed = true;
359	ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
360				     msecs_to_jiffies(WL1271_SCAN_TIMEOUT));
361
362	wl->ops->scan_start(wl, wlvif, req);
363
364	return 0;
365}
366/* Returns the scan type to be used or a negative value on error */
367int
368wlcore_scan_sched_scan_ssid_list(struct wl1271 *wl,
369				 struct wl12xx_vif *wlvif,
370				 struct cfg80211_sched_scan_request *req)
371{
372	struct wl1271_cmd_sched_scan_ssid_list *cmd = NULL;
373	struct cfg80211_match_set *sets = req->match_sets;
374	struct cfg80211_ssid *ssids = req->ssids;
375	int ret = 0, type, i, j, n_match_ssids = 0;
376
377	wl1271_debug((DEBUG_CMD | DEBUG_SCAN), "cmd sched scan ssid list");
378
379	/* count the match sets that contain SSIDs */
380	for (i = 0; i < req->n_match_sets; i++)
381		if (sets[i].ssid.ssid_len > 0)
382			n_match_ssids++;
383
384	/* No filter, no ssids or only bcast ssid */
385	if (!n_match_ssids &&
386	    (!req->n_ssids ||
387	     (req->n_ssids == 1 && req->ssids[0].ssid_len == 0))) {
388		type = SCAN_SSID_FILTER_ANY;
389		goto out;
390	}
391
392	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
393	if (!cmd) {
394		ret = -ENOMEM;
395		goto out;
396	}
397
398	cmd->role_id = wlvif->role_id;
399	if (!n_match_ssids) {
400		/* No filter, with ssids */
401		type = SCAN_SSID_FILTER_DISABLED;
402
403		for (i = 0; i < req->n_ssids; i++) {
404			cmd->ssids[cmd->n_ssids].type = (ssids[i].ssid_len) ?
405				SCAN_SSID_TYPE_HIDDEN : SCAN_SSID_TYPE_PUBLIC;
406			cmd->ssids[cmd->n_ssids].len = ssids[i].ssid_len;
407			memcpy(cmd->ssids[cmd->n_ssids].ssid, ssids[i].ssid,
408			       ssids[i].ssid_len);
409			cmd->n_ssids++;
410		}
411	} else {
412		type = SCAN_SSID_FILTER_LIST;
413
414		/* Add all SSIDs from the filters */
415		for (i = 0; i < req->n_match_sets; i++) {
416			/* ignore sets without SSIDs */
417			if (!sets[i].ssid.ssid_len)
418				continue;
419
420			cmd->ssids[cmd->n_ssids].type = SCAN_SSID_TYPE_PUBLIC;
421			cmd->ssids[cmd->n_ssids].len = sets[i].ssid.ssid_len;
422			memcpy(cmd->ssids[cmd->n_ssids].ssid,
423			       sets[i].ssid.ssid, sets[i].ssid.ssid_len);
424			cmd->n_ssids++;
425		}
426		if ((req->n_ssids > 1) ||
427		    (req->n_ssids == 1 && req->ssids[0].ssid_len > 0)) {
428			/*
429			 * Mark all the SSIDs passed in the SSID list as HIDDEN,
430			 * so they're used in probe requests.
431			 */
432			for (i = 0; i < req->n_ssids; i++) {
433				if (!req->ssids[i].ssid_len)
434					continue;
435
436				for (j = 0; j < cmd->n_ssids; j++)
437					if ((req->ssids[i].ssid_len ==
438					     cmd->ssids[j].len) &&
439					    !memcmp(req->ssids[i].ssid,
440						   cmd->ssids[j].ssid,
441						   req->ssids[i].ssid_len)) {
442						cmd->ssids[j].type =
443							SCAN_SSID_TYPE_HIDDEN;
444						break;
445					}
446				/* Fail if SSID isn't present in the filters */
447				if (j == cmd->n_ssids) {
448					ret = -EINVAL;
449					goto out_free;
450				}
451			}
452		}
453	}
454
455	ret = wl1271_cmd_send(wl, CMD_CONNECTION_SCAN_SSID_CFG, cmd,
456			      sizeof(*cmd), 0);
457	if (ret < 0) {
458		wl1271_error("cmd sched scan ssid list failed");
459		goto out_free;
460	}
461
462out_free:
463	kfree(cmd);
464out:
465	if (ret < 0)
466		return ret;
467	return type;
468}
469EXPORT_SYMBOL_GPL(wlcore_scan_sched_scan_ssid_list);
470
471void wlcore_scan_sched_scan_results(struct wl1271 *wl)
472{
473	wl1271_debug(DEBUG_SCAN, "got periodic scan results");
474
475	ieee80211_sched_scan_results(wl->hw);
476}
477EXPORT_SYMBOL_GPL(wlcore_scan_sched_scan_results);