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Diffstat (limited to 'drivers/net/wireless/iwlwifi/mvm/scan.c')
-rw-r--r--drivers/net/wireless/iwlwifi/mvm/scan.c437
1 files changed, 437 insertions, 0 deletions
diff --git a/drivers/net/wireless/iwlwifi/mvm/scan.c b/drivers/net/wireless/iwlwifi/mvm/scan.c
new file mode 100644
index 000000000000..406c53ad0a49
--- /dev/null
+++ b/drivers/net/wireless/iwlwifi/mvm/scan.c
@@ -0,0 +1,437 @@
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 - 2013 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 LICENSE.GPL.
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 - 2013 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
74static inline __le16 iwl_mvm_scan_rx_chain(struct iwl_mvm *mvm)
75{
76 u16 rx_chain;
77 u8 rx_ant = mvm->nvm_data->valid_rx_ant;
78
79 rx_chain = rx_ant << PHY_RX_CHAIN_VALID_POS;
80 rx_chain |= rx_ant << PHY_RX_CHAIN_FORCE_MIMO_SEL_POS;
81 rx_chain |= rx_ant << PHY_RX_CHAIN_FORCE_SEL_POS;
82 rx_chain |= 0x1 << PHY_RX_CHAIN_DRIVER_FORCE_POS;
83 return cpu_to_le16(rx_chain);
84}
85
86static inline __le32 iwl_mvm_scan_max_out_time(struct ieee80211_vif *vif)
87{
88 if (vif->bss_conf.assoc)
89 return cpu_to_le32(200 * 1024);
90 else
91 return 0;
92}
93
94static inline __le32 iwl_mvm_scan_suspend_time(struct ieee80211_vif *vif)
95{
96 if (vif->bss_conf.assoc)
97 return cpu_to_le32(vif->bss_conf.beacon_int);
98 else
99 return 0;
100}
101
102static inline __le32
103iwl_mvm_scan_rxon_flags(struct cfg80211_scan_request *req)
104{
105 if (req->channels[0]->band == IEEE80211_BAND_2GHZ)
106 return cpu_to_le32(PHY_BAND_24);
107 else
108 return cpu_to_le32(PHY_BAND_5);
109}
110
111static inline __le32
112iwl_mvm_scan_rate_n_flags(struct iwl_mvm *mvm, enum ieee80211_band band,
113 bool no_cck)
114{
115 u32 tx_ant;
116
117 mvm->scan_last_antenna_idx =
118 iwl_mvm_next_antenna(mvm, mvm->nvm_data->valid_tx_ant,
119 mvm->scan_last_antenna_idx);
120 tx_ant = BIT(mvm->scan_last_antenna_idx) << RATE_MCS_ANT_POS;
121
122 if (band == IEEE80211_BAND_2GHZ && !no_cck)
123 return cpu_to_le32(IWL_RATE_1M_PLCP | RATE_MCS_CCK_MSK |
124 tx_ant);
125 else
126 return cpu_to_le32(IWL_RATE_6M_PLCP | tx_ant);
127}
128
129/*
130 * We insert the SSIDs in an inverted order, because the FW will
131 * invert it back. The most prioritized SSID, which is first in the
132 * request list, is not copied here, but inserted directly to the probe
133 * request.
134 */
135static void iwl_mvm_scan_fill_ssids(struct iwl_scan_cmd *cmd,
136 struct cfg80211_scan_request *req)
137{
138 int fw_idx, req_idx;
139
140 fw_idx = 0;
141 for (req_idx = req->n_ssids - 1; req_idx > 0; req_idx--) {
142 cmd->direct_scan[fw_idx].id = WLAN_EID_SSID;
143 cmd->direct_scan[fw_idx].len = req->ssids[req_idx].ssid_len;
144 memcpy(cmd->direct_scan[fw_idx].ssid,
145 req->ssids[req_idx].ssid,
146 req->ssids[req_idx].ssid_len);
147 }
148}
149
150/*
151 * If req->n_ssids > 0, it means we should do an active scan.
152 * In case of active scan w/o directed scan, we receive a zero-length SSID
153 * just to notify that this scan is active and not passive.
154 * In order to notify the FW of the number of SSIDs we wish to scan (including
155 * the zero-length one), we need to set the corresponding bits in chan->type,
156 * one for each SSID, and set the active bit (first).
157 */
158static u16 iwl_mvm_get_active_dwell(enum ieee80211_band band, int n_ssids)
159{
160 if (band == IEEE80211_BAND_2GHZ)
161 return 30 + 3 * (n_ssids + 1);
162 return 20 + 2 * (n_ssids + 1);
163}
164
165static u16 iwl_mvm_get_passive_dwell(enum ieee80211_band band)
166{
167 return band == IEEE80211_BAND_2GHZ ? 100 + 20 : 100 + 10;
168}
169
170static void iwl_mvm_scan_fill_channels(struct iwl_scan_cmd *cmd,
171 struct cfg80211_scan_request *req)
172{
173 u16 passive_dwell = iwl_mvm_get_passive_dwell(req->channels[0]->band);
174 u16 active_dwell = iwl_mvm_get_active_dwell(req->channels[0]->band,
175 req->n_ssids);
176 struct iwl_scan_channel *chan = (struct iwl_scan_channel *)
177 (cmd->data + le16_to_cpu(cmd->tx_cmd.len));
178 int i;
179 __le32 chan_type_value;
180
181 if (req->n_ssids > 0)
182 chan_type_value = cpu_to_le32(BIT(req->n_ssids + 1) - 1);
183 else
184 chan_type_value = SCAN_CHANNEL_TYPE_PASSIVE;
185
186 for (i = 0; i < cmd->channel_count; i++) {
187 chan->channel = cpu_to_le16(req->channels[i]->hw_value);
188 if (req->channels[i]->flags & IEEE80211_CHAN_PASSIVE_SCAN)
189 chan->type = SCAN_CHANNEL_TYPE_PASSIVE;
190 else
191 chan->type = chan_type_value;
192 chan->active_dwell = cpu_to_le16(active_dwell);
193 chan->passive_dwell = cpu_to_le16(passive_dwell);
194 chan->iteration_count = cpu_to_le16(1);
195 chan++;
196 }
197}
198
199/*
200 * Fill in probe request with the following parameters:
201 * TA is our vif HW address, which mac80211 ensures we have.
202 * Packet is broadcasted, so this is both SA and DA.
203 * The probe request IE is made out of two: first comes the most prioritized
204 * SSID if a directed scan is requested. Second comes whatever extra
205 * information was given to us as the scan request IE.
206 */
207static u16 iwl_mvm_fill_probe_req(struct ieee80211_mgmt *frame, const u8 *ta,
208 int n_ssids, const u8 *ssid, int ssid_len,
209 const u8 *ie, int ie_len,
210 int left)
211{
212 int len = 0;
213 u8 *pos = NULL;
214
215 /* Make sure there is enough space for the probe request,
216 * two mandatory IEs and the data */
217 left -= 24;
218 if (left < 0)
219 return 0;
220
221 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
222 eth_broadcast_addr(frame->da);
223 memcpy(frame->sa, ta, ETH_ALEN);
224 eth_broadcast_addr(frame->bssid);
225 frame->seq_ctrl = 0;
226
227 len += 24;
228
229 /* for passive scans, no need to fill anything */
230 if (n_ssids == 0)
231 return (u16)len;
232
233 /* points to the payload of the request */
234 pos = &frame->u.probe_req.variable[0];
235
236 /* fill in our SSID IE */
237 left -= ssid_len + 2;
238 if (left < 0)
239 return 0;
240 *pos++ = WLAN_EID_SSID;
241 *pos++ = ssid_len;
242 if (ssid && ssid_len) { /* ssid_len may be == 0 even if ssid is valid */
243 memcpy(pos, ssid, ssid_len);
244 pos += ssid_len;
245 }
246
247 len += ssid_len + 2;
248
249 if (WARN_ON(left < ie_len))
250 return len;
251
252 if (ie && ie_len) {
253 memcpy(pos, ie, ie_len);
254 len += ie_len;
255 }
256
257 return (u16)len;
258}
259
260int iwl_mvm_scan_request(struct iwl_mvm *mvm,
261 struct ieee80211_vif *vif,
262 struct cfg80211_scan_request *req)
263{
264 struct iwl_host_cmd hcmd = {
265 .id = SCAN_REQUEST_CMD,
266 .len = { 0, },
267 .data = { mvm->scan_cmd, },
268 .flags = CMD_SYNC,
269 .dataflags = { IWL_HCMD_DFL_NOCOPY, },
270 };
271 struct iwl_scan_cmd *cmd = mvm->scan_cmd;
272 int ret;
273 u32 status;
274 int ssid_len = 0;
275 u8 *ssid = NULL;
276
277 lockdep_assert_held(&mvm->mutex);
278 BUG_ON(mvm->scan_cmd == NULL);
279
280 IWL_DEBUG_SCAN(mvm, "Handling mac80211 scan request\n");
281 mvm->scan_status = IWL_MVM_SCAN_OS;
282 memset(cmd, 0, sizeof(struct iwl_scan_cmd) +
283 mvm->fw->ucode_capa.max_probe_length +
284 (MAX_NUM_SCAN_CHANNELS * sizeof(struct iwl_scan_channel)));
285
286 cmd->channel_count = (u8)req->n_channels;
287 cmd->quiet_time = cpu_to_le16(IWL_ACTIVE_QUIET_TIME);
288 cmd->quiet_plcp_th = cpu_to_le16(IWL_PLCP_QUIET_THRESH);
289 cmd->rxchain_sel_flags = iwl_mvm_scan_rx_chain(mvm);
290 cmd->max_out_time = iwl_mvm_scan_max_out_time(vif);
291 cmd->suspend_time = iwl_mvm_scan_suspend_time(vif);
292 cmd->rxon_flags = iwl_mvm_scan_rxon_flags(req);
293 cmd->filter_flags = cpu_to_le32(MAC_FILTER_ACCEPT_GRP |
294 MAC_FILTER_IN_BEACON);
295 cmd->type = SCAN_TYPE_FORCED;
296 cmd->repeats = cpu_to_le32(1);
297
298 /*
299 * If the user asked for passive scan, don't change to active scan if
300 * you see any activity on the channel - remain passive.
301 */
302 if (req->n_ssids > 0) {
303 cmd->passive2active = cpu_to_le16(1);
304 ssid = req->ssids[0].ssid;
305 ssid_len = req->ssids[0].ssid_len;
306 } else {
307 cmd->passive2active = 0;
308 }
309
310 iwl_mvm_scan_fill_ssids(cmd, req);
311
312 cmd->tx_cmd.tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL);
313 cmd->tx_cmd.sta_id = mvm->aux_sta.sta_id;
314 cmd->tx_cmd.life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
315 cmd->tx_cmd.rate_n_flags =
316 iwl_mvm_scan_rate_n_flags(mvm, req->channels[0]->band,
317 req->no_cck);
318
319 cmd->tx_cmd.len =
320 cpu_to_le16(iwl_mvm_fill_probe_req(
321 (struct ieee80211_mgmt *)cmd->data,
322 vif->addr,
323 req->n_ssids, ssid, ssid_len,
324 req->ie, req->ie_len,
325 mvm->fw->ucode_capa.max_probe_length));
326
327 iwl_mvm_scan_fill_channels(cmd, req);
328
329 cmd->len = cpu_to_le16(sizeof(struct iwl_scan_cmd) +
330 le16_to_cpu(cmd->tx_cmd.len) +
331 (cmd->channel_count * sizeof(struct iwl_scan_channel)));
332 hcmd.len[0] = le16_to_cpu(cmd->len);
333
334 status = SCAN_RESPONSE_OK;
335 ret = iwl_mvm_send_cmd_status(mvm, &hcmd, &status);
336 if (!ret && status == SCAN_RESPONSE_OK) {
337 IWL_DEBUG_SCAN(mvm, "Scan request was sent successfully\n");
338 } else {
339 /*
340 * If the scan failed, it usually means that the FW was unable
341 * to allocate the time events. Warn on it, but maybe we
342 * should try to send the command again with different params.
343 */
344 IWL_ERR(mvm, "Scan failed! status 0x%x ret %d\n",
345 status, ret);
346 mvm->scan_status = IWL_MVM_SCAN_NONE;
347 ret = -EIO;
348 }
349 return ret;
350}
351
352int iwl_mvm_rx_scan_response(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
353 struct iwl_device_cmd *cmd)
354{
355 struct iwl_rx_packet *pkt = rxb_addr(rxb);
356 struct iwl_cmd_response *resp = (void *)pkt->data;
357
358 IWL_DEBUG_SCAN(mvm, "Scan response received. status 0x%x\n",
359 le32_to_cpu(resp->status));
360 return 0;
361}
362
363int iwl_mvm_rx_scan_complete(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
364 struct iwl_device_cmd *cmd)
365{
366 struct iwl_rx_packet *pkt = rxb_addr(rxb);
367 struct iwl_scan_complete_notif *notif = (void *)pkt->data;
368
369 IWL_DEBUG_SCAN(mvm, "Scan complete: status=0x%x scanned channels=%d\n",
370 notif->status, notif->scanned_channels);
371
372 mvm->scan_status = IWL_MVM_SCAN_NONE;
373 ieee80211_scan_completed(mvm->hw, notif->status != SCAN_COMP_STATUS_OK);
374
375 return 0;
376}
377
378static bool iwl_mvm_scan_abort_notif(struct iwl_notif_wait_data *notif_wait,
379 struct iwl_rx_packet *pkt, void *data)
380{
381 struct iwl_mvm *mvm =
382 container_of(notif_wait, struct iwl_mvm, notif_wait);
383 struct iwl_scan_complete_notif *notif;
384 u32 *resp;
385
386 switch (pkt->hdr.cmd) {
387 case SCAN_ABORT_CMD:
388 resp = (void *)pkt->data;
389 if (*resp == CAN_ABORT_STATUS) {
390 IWL_DEBUG_SCAN(mvm,
391 "Scan can be aborted, wait until completion\n");
392 return false;
393 }
394
395 IWL_DEBUG_SCAN(mvm, "Scan cannot be aborted, exit now: %d\n",
396 *resp);
397 return true;
398
399 case SCAN_COMPLETE_NOTIFICATION:
400 notif = (void *)pkt->data;
401 IWL_DEBUG_SCAN(mvm, "Scan aborted: status 0x%x\n",
402 notif->status);
403 return true;
404
405 default:
406 WARN_ON(1);
407 return false;
408 };
409}
410
411void iwl_mvm_cancel_scan(struct iwl_mvm *mvm)
412{
413 struct iwl_notification_wait wait_scan_abort;
414 static const u8 scan_abort_notif[] = { SCAN_ABORT_CMD,
415 SCAN_COMPLETE_NOTIFICATION };
416 int ret;
417
418 iwl_init_notification_wait(&mvm->notif_wait, &wait_scan_abort,
419 scan_abort_notif,
420 ARRAY_SIZE(scan_abort_notif),
421 iwl_mvm_scan_abort_notif, NULL);
422
423 ret = iwl_mvm_send_cmd_pdu(mvm, SCAN_ABORT_CMD, CMD_SYNC, 0, NULL);
424 if (ret) {
425 IWL_ERR(mvm, "Couldn't send SCAN_ABORT_CMD: %d\n", ret);
426 goto out_remove_notif;
427 }
428
429 ret = iwl_wait_notification(&mvm->notif_wait, &wait_scan_abort, 1 * HZ);
430 if (ret)
431 IWL_ERR(mvm, "%s - failed on timeout\n", __func__);
432
433 return;
434
435out_remove_notif:
436 iwl_remove_notification(&mvm->notif_wait, &wait_scan_abort);
437}
generated by cgit v1.2.2 (git 2.25.0) at 2025-03-08 17:48:27 -0500