summaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/iwlwifi/mvm/scan.c
blob: 9a7ab84953000234b463ac1636cabcf506b95433 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
/******************************************************************************
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
 * USA
 *
 * The full GNU General Public License is included in this distribution
 * in the file called COPYING.
 *
 * Contact Information:
 *  Intel Linux Wireless <ilw@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 * BSD LICENSE
 *
 * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *  * Neither the name Intel Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *****************************************************************************/

#include <linux/etherdevice.h>
#include <net/mac80211.h>

#include "mvm.h"
#include "iwl-eeprom-parse.h"
#include "fw-api-scan.h"

#define IWL_PLCP_QUIET_THRESH 1
#define IWL_ACTIVE_QUIET_TIME 10

static inline __le16 iwl_mvm_scan_rx_chain(struct iwl_mvm *mvm)
{
	u16 rx_chain;
	u8 rx_ant = iwl_fw_valid_rx_ant(mvm->fw);

	rx_chain = rx_ant << PHY_RX_CHAIN_VALID_POS;
	rx_chain |= rx_ant << PHY_RX_CHAIN_FORCE_MIMO_SEL_POS;
	rx_chain |= rx_ant << PHY_RX_CHAIN_FORCE_SEL_POS;
	rx_chain |= 0x1 << PHY_RX_CHAIN_DRIVER_FORCE_POS;
	return cpu_to_le16(rx_chain);
}

static inline __le32 iwl_mvm_scan_max_out_time(struct ieee80211_vif *vif)
{
	if (vif->bss_conf.assoc)
		return cpu_to_le32(200 * 1024);
	else
		return 0;
}

static inline __le32 iwl_mvm_scan_suspend_time(struct ieee80211_vif *vif)
{
	if (vif->bss_conf.assoc)
		return cpu_to_le32(vif->bss_conf.beacon_int);
	else
		return 0;
}

static inline __le32
iwl_mvm_scan_rxon_flags(struct cfg80211_scan_request *req)
{
	if (req->channels[0]->band == IEEE80211_BAND_2GHZ)
		return cpu_to_le32(PHY_BAND_24);
	else
		return cpu_to_le32(PHY_BAND_5);
}

static inline __le32
iwl_mvm_scan_rate_n_flags(struct iwl_mvm *mvm, enum ieee80211_band band,
			  bool no_cck)
{
	u32 tx_ant;

	mvm->scan_last_antenna_idx =
		iwl_mvm_next_antenna(mvm, iwl_fw_valid_tx_ant(mvm->fw),
				     mvm->scan_last_antenna_idx);
	tx_ant = BIT(mvm->scan_last_antenna_idx) << RATE_MCS_ANT_POS;

	if (band == IEEE80211_BAND_2GHZ && !no_cck)
		return cpu_to_le32(IWL_RATE_1M_PLCP | RATE_MCS_CCK_MSK |
				   tx_ant);
	else
		return cpu_to_le32(IWL_RATE_6M_PLCP | tx_ant);
}

/*
 * We insert the SSIDs in an inverted order, because the FW will
 * invert it back. The most prioritized SSID, which is first in the
 * request list, is not copied here, but inserted directly to the probe
 * request.
 */
static void iwl_mvm_scan_fill_ssids(struct iwl_scan_cmd *cmd,
				    struct cfg80211_scan_request *req)
{
	int fw_idx, req_idx;

	for (req_idx = req->n_ssids - 1, fw_idx = 0; req_idx > 0;
	     req_idx--, fw_idx++) {
		cmd->direct_scan[fw_idx].id = WLAN_EID_SSID;
		cmd->direct_scan[fw_idx].len = req->ssids[req_idx].ssid_len;
		memcpy(cmd->direct_scan[fw_idx].ssid,
		       req->ssids[req_idx].ssid,
		       req->ssids[req_idx].ssid_len);
	}
}

/*
 * If req->n_ssids > 0, it means we should do an active scan.
 * In case of active scan w/o directed scan, we receive a zero-length SSID
 * just to notify that this scan is active and not passive.
 * In order to notify the FW of the number of SSIDs we wish to scan (including
 * the zero-length one), we need to set the corresponding bits in chan->type,
 * one for each SSID, and set the active bit (first). The first SSID is already
 * included in the probe template, so we need to set only req->n_ssids - 1 bits
 * in addition to the first bit.
 */
static u16 iwl_mvm_get_active_dwell(enum ieee80211_band band, int n_ssids)
{
	if (band == IEEE80211_BAND_2GHZ)
		return 30  + 3 * (n_ssids + 1);
	return 20  + 2 * (n_ssids + 1);
}

static u16 iwl_mvm_get_passive_dwell(enum ieee80211_band band)
{
	return band == IEEE80211_BAND_2GHZ ? 100 + 20 : 100 + 10;
}

static void iwl_mvm_scan_fill_channels(struct iwl_scan_cmd *cmd,
				       struct cfg80211_scan_request *req)
{
	u16 passive_dwell = iwl_mvm_get_passive_dwell(req->channels[0]->band);
	u16 active_dwell = iwl_mvm_get_active_dwell(req->channels[0]->band,
						    req->n_ssids);
	struct iwl_scan_channel *chan = (struct iwl_scan_channel *)
		(cmd->data + le16_to_cpu(cmd->tx_cmd.len));
	int i;

	for (i = 0; i < cmd->channel_count; i++) {
		chan->channel = cpu_to_le16(req->channels[i]->hw_value);
		chan->type = cpu_to_le32(BIT(req->n_ssids) - 1);
		if (req->channels[i]->flags & IEEE80211_CHAN_PASSIVE_SCAN)
			chan->type &= cpu_to_le32(~SCAN_CHANNEL_TYPE_ACTIVE);
		chan->active_dwell = cpu_to_le16(active_dwell);
		chan->passive_dwell = cpu_to_le16(passive_dwell);
		chan->iteration_count = cpu_to_le16(1);
		chan++;
	}
}

/*
 * Fill in probe request with the following parameters:
 * TA is our vif HW address, which mac80211 ensures we have.
 * Packet is broadcasted, so this is both SA and DA.
 * The probe request IE is made out of two: first comes the most prioritized
 * SSID if a directed scan is requested. Second comes whatever extra
 * information was given to us as the scan request IE.
 */
static u16 iwl_mvm_fill_probe_req(struct ieee80211_mgmt *frame, const u8 *ta,
				  int n_ssids, const u8 *ssid, int ssid_len,
				  const u8 *ie, int ie_len,
				  int left)
{
	int len = 0;
	u8 *pos = NULL;

	/* Make sure there is enough space for the probe request,
	 * two mandatory IEs and the data */
	left -= 24;
	if (left < 0)
		return 0;

	frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
	eth_broadcast_addr(frame->da);
	memcpy(frame->sa, ta, ETH_ALEN);
	eth_broadcast_addr(frame->bssid);
	frame->seq_ctrl = 0;

	len += 24;

	/* for passive scans, no need to fill anything */
	if (n_ssids == 0)
		return (u16)len;

	/* points to the payload of the request */
	pos = &frame->u.probe_req.variable[0];

	/* fill in our SSID IE */
	left -= ssid_len + 2;
	if (left < 0)
		return 0;
	*pos++ = WLAN_EID_SSID;
	*pos++ = ssid_len;
	if (ssid && ssid_len) { /* ssid_len may be == 0 even if ssid is valid */
		memcpy(pos, ssid, ssid_len);
		pos += ssid_len;
	}

	len += ssid_len + 2;

	if (WARN_ON(left < ie_len))
		return len;

	if (ie && ie_len) {
		memcpy(pos, ie, ie_len);
		len += ie_len;
	}

	return (u16)len;
}

int iwl_mvm_scan_request(struct iwl_mvm *mvm,
			 struct ieee80211_vif *vif,
			 struct cfg80211_scan_request *req)
{
	struct iwl_host_cmd hcmd = {
		.id = SCAN_REQUEST_CMD,
		.len = { 0, },
		.data = { mvm->scan_cmd, },
		.flags = CMD_SYNC,
		.dataflags = { IWL_HCMD_DFL_NOCOPY, },
	};
	struct iwl_scan_cmd *cmd = mvm->scan_cmd;
	int ret;
	u32 status;
	int ssid_len = 0;
	u8 *ssid = NULL;

	lockdep_assert_held(&mvm->mutex);
	BUG_ON(mvm->scan_cmd == NULL);

	IWL_DEBUG_SCAN(mvm, "Handling mac80211 scan request\n");
	mvm->scan_status = IWL_MVM_SCAN_OS;
	memset(cmd, 0, sizeof(struct iwl_scan_cmd) +
	       mvm->fw->ucode_capa.max_probe_length +
	       (MAX_NUM_SCAN_CHANNELS * sizeof(struct iwl_scan_channel)));

	cmd->channel_count = (u8)req->n_channels;
	cmd->quiet_time = cpu_to_le16(IWL_ACTIVE_QUIET_TIME);
	cmd->quiet_plcp_th = cpu_to_le16(IWL_PLCP_QUIET_THRESH);
	cmd->rxchain_sel_flags = iwl_mvm_scan_rx_chain(mvm);
	cmd->max_out_time = iwl_mvm_scan_max_out_time(vif);
	cmd->suspend_time = iwl_mvm_scan_suspend_time(vif);
	cmd->rxon_flags = iwl_mvm_scan_rxon_flags(req);
	cmd->filter_flags = cpu_to_le32(MAC_FILTER_ACCEPT_GRP |
					MAC_FILTER_IN_BEACON);

	if (vif->type == NL80211_IFTYPE_P2P_DEVICE)
		cmd->type = cpu_to_le32(SCAN_TYPE_DISCOVERY_FORCED);
	else
		cmd->type = cpu_to_le32(SCAN_TYPE_FORCED);

	cmd->repeats = cpu_to_le32(1);

	/*
	 * If the user asked for passive scan, don't change to active scan if
	 * you see any activity on the channel - remain passive.
	 */
	if (req->n_ssids > 0) {
		cmd->passive2active = cpu_to_le16(1);
		cmd->scan_flags |= SCAN_FLAGS_PASSIVE2ACTIVE;
		ssid = req->ssids[0].ssid;
		ssid_len = req->ssids[0].ssid_len;
	} else {
		cmd->passive2active = 0;
		cmd->scan_flags &= ~SCAN_FLAGS_PASSIVE2ACTIVE;
	}

	iwl_mvm_scan_fill_ssids(cmd, req);

	cmd->tx_cmd.tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL);
	cmd->tx_cmd.sta_id = mvm->aux_sta.sta_id;
	cmd->tx_cmd.life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
	cmd->tx_cmd.rate_n_flags =
			iwl_mvm_scan_rate_n_flags(mvm, req->channels[0]->band,
						  req->no_cck);

	cmd->tx_cmd.len =
		cpu_to_le16(iwl_mvm_fill_probe_req(
			    (struct ieee80211_mgmt *)cmd->data,
			    vif->addr,
			    req->n_ssids, ssid, ssid_len,
			    req->ie, req->ie_len,
			    mvm->fw->ucode_capa.max_probe_length));

	iwl_mvm_scan_fill_channels(cmd, req);

	cmd->len = cpu_to_le16(sizeof(struct iwl_scan_cmd) +
		le16_to_cpu(cmd->tx_cmd.len) +
		(cmd->channel_count * sizeof(struct iwl_scan_channel)));
	hcmd.len[0] = le16_to_cpu(cmd->len);

	status = SCAN_RESPONSE_OK;
	ret = iwl_mvm_send_cmd_status(mvm, &hcmd, &status);
	if (!ret && status == SCAN_RESPONSE_OK) {
		IWL_DEBUG_SCAN(mvm, "Scan request was sent successfully\n");
	} else {
		/*
		 * If the scan failed, it usually means that the FW was unable
		 * to allocate the time events. Warn on it, but maybe we
		 * should try to send the command again with different params.
		 */
		IWL_ERR(mvm, "Scan failed! status 0x%x ret %d\n",
			status, ret);
		mvm->scan_status = IWL_MVM_SCAN_NONE;
		ret = -EIO;
	}
	return ret;
}

int iwl_mvm_rx_scan_response(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
			  struct iwl_device_cmd *cmd)
{
	struct iwl_rx_packet *pkt = rxb_addr(rxb);
	struct iwl_cmd_response *resp = (void *)pkt->data;

	IWL_DEBUG_SCAN(mvm, "Scan response received. status 0x%x\n",
		       le32_to_cpu(resp->status));
	return 0;
}

int iwl_mvm_rx_scan_complete(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
			  struct iwl_device_cmd *cmd)
{
	struct iwl_rx_packet *pkt = rxb_addr(rxb);
	struct iwl_scan_complete_notif *notif = (void *)pkt->data;

	IWL_DEBUG_SCAN(mvm, "Scan complete: status=0x%x scanned channels=%d\n",
		       notif->status, notif->scanned_channels);

	mvm->scan_status = IWL_MVM_SCAN_NONE;
	ieee80211_scan_completed(mvm->hw, notif->status != SCAN_COMP_STATUS_OK);

	return 0;
}

static bool iwl_mvm_scan_abort_notif(struct iwl_notif_wait_data *notif_wait,
				     struct iwl_rx_packet *pkt, void *data)
{
	struct iwl_mvm *mvm =
		container_of(notif_wait, struct iwl_mvm, notif_wait);
	struct iwl_scan_complete_notif *notif;
	u32 *resp;

	switch (pkt->hdr.cmd) {
	case SCAN_ABORT_CMD:
		resp = (void *)pkt->data;
		if (*resp == CAN_ABORT_STATUS) {
			IWL_DEBUG_SCAN(mvm,
				       "Scan can be aborted, wait until completion\n");
			return false;
		}

		IWL_DEBUG_SCAN(mvm, "Scan cannot be aborted, exit now: %d\n",
			       *resp);
		return true;

	case SCAN_COMPLETE_NOTIFICATION:
		notif = (void *)pkt->data;
		IWL_DEBUG_SCAN(mvm, "Scan aborted: status 0x%x\n",
			       notif->status);
		return true;

	default:
		WARN_ON(1);
		return false;
	};
}

void iwl_mvm_cancel_scan(struct iwl_mvm *mvm)
{
	struct iwl_notification_wait wait_scan_abort;
	static const u8 scan_abort_notif[] = { SCAN_ABORT_CMD,
					       SCAN_COMPLETE_NOTIFICATION };
	int ret;

	iwl_init_notification_wait(&mvm->notif_wait, &wait_scan_abort,
				   scan_abort_notif,
				   ARRAY_SIZE(scan_abort_notif),
				   iwl_mvm_scan_abort_notif, NULL);

	ret = iwl_mvm_send_cmd_pdu(mvm, SCAN_ABORT_CMD, CMD_SYNC, 0, NULL);
	if (ret) {
		IWL_ERR(mvm, "Couldn't send SCAN_ABORT_CMD: %d\n", ret);
		goto out_remove_notif;
	}

	ret = iwl_wait_notification(&mvm->notif_wait, &wait_scan_abort, 1 * HZ);
	if (ret)
		IWL_ERR(mvm, "%s - failed on timeout\n", __func__);

	return;

out_remove_notif:
	iwl_remove_notification(&mvm->notif_wait, &wait_scan_abort);
}