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[deliverable/linux.git] / drivers / net / wireless / iwlwifi / mvm / power.c
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 - 2014 Intel Corporation. All rights reserved.
9 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of version 2 of the GNU General Public License as
13 * published by the Free Software Foundation.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
23 * USA
24 *
25 * The full GNU General Public License is included in this distribution
26 * in the file called COPYING.
27 *
28 * Contact Information:
29 * Intel Linux Wireless <ilw@linux.intel.com>
30 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
31 *
32 * BSD LICENSE
33 *
34 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
35 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
36 * All rights reserved.
37 *
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
40 * are met:
41 *
42 * * Redistributions of source code must retain the above copyright
43 * notice, this list of conditions and the following disclaimer.
44 * * Redistributions in binary form must reproduce the above copyright
45 * notice, this list of conditions and the following disclaimer in
46 * the documentation and/or other materials provided with the
47 * distribution.
48 * * Neither the name Intel Corporation nor the names of its
49 * contributors may be used to endorse or promote products derived
50 * from this software without specific prior written permission.
51 *
52 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
53 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
54 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
55 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
56 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
57 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
58 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
59 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
60 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
61 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
62 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
63 *
64 *****************************************************************************/
65
66 #include <linux/kernel.h>
67 #include <linux/module.h>
68 #include <linux/slab.h>
69
70 #include <net/mac80211.h>
71
72 #include "iwl-debug.h"
73 #include "mvm.h"
74 #include "iwl-modparams.h"
75 #include "fw-api-power.h"
76
77 #define POWER_KEEP_ALIVE_PERIOD_SEC 25
78
79 static
80 int iwl_mvm_beacon_filter_send_cmd(struct iwl_mvm *mvm,
81 struct iwl_beacon_filter_cmd *cmd,
82 u32 flags)
83 {
84 IWL_DEBUG_POWER(mvm, "ba_enable_beacon_abort is: %d\n",
85 le32_to_cpu(cmd->ba_enable_beacon_abort));
86 IWL_DEBUG_POWER(mvm, "ba_escape_timer is: %d\n",
87 le32_to_cpu(cmd->ba_escape_timer));
88 IWL_DEBUG_POWER(mvm, "bf_debug_flag is: %d\n",
89 le32_to_cpu(cmd->bf_debug_flag));
90 IWL_DEBUG_POWER(mvm, "bf_enable_beacon_filter is: %d\n",
91 le32_to_cpu(cmd->bf_enable_beacon_filter));
92 IWL_DEBUG_POWER(mvm, "bf_energy_delta is: %d\n",
93 le32_to_cpu(cmd->bf_energy_delta));
94 IWL_DEBUG_POWER(mvm, "bf_escape_timer is: %d\n",
95 le32_to_cpu(cmd->bf_escape_timer));
96 IWL_DEBUG_POWER(mvm, "bf_roaming_energy_delta is: %d\n",
97 le32_to_cpu(cmd->bf_roaming_energy_delta));
98 IWL_DEBUG_POWER(mvm, "bf_roaming_state is: %d\n",
99 le32_to_cpu(cmd->bf_roaming_state));
100 IWL_DEBUG_POWER(mvm, "bf_temp_threshold is: %d\n",
101 le32_to_cpu(cmd->bf_temp_threshold));
102 IWL_DEBUG_POWER(mvm, "bf_temp_fast_filter is: %d\n",
103 le32_to_cpu(cmd->bf_temp_fast_filter));
104 IWL_DEBUG_POWER(mvm, "bf_temp_slow_filter is: %d\n",
105 le32_to_cpu(cmd->bf_temp_slow_filter));
106
107 return iwl_mvm_send_cmd_pdu(mvm, REPLY_BEACON_FILTERING_CMD, flags,
108 sizeof(struct iwl_beacon_filter_cmd), cmd);
109 }
110
111 static
112 void iwl_mvm_beacon_filter_set_cqm_params(struct iwl_mvm *mvm,
113 struct ieee80211_vif *vif,
114 struct iwl_beacon_filter_cmd *cmd)
115 {
116 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
117
118 if (vif->bss_conf.cqm_rssi_thold) {
119 cmd->bf_energy_delta =
120 cpu_to_le32(vif->bss_conf.cqm_rssi_hyst);
121 /* fw uses an absolute value for this */
122 cmd->bf_roaming_state =
123 cpu_to_le32(-vif->bss_conf.cqm_rssi_thold);
124 }
125 cmd->ba_enable_beacon_abort = cpu_to_le32(mvmvif->bf_data.ba_enabled);
126 }
127
128 static void iwl_mvm_power_log(struct iwl_mvm *mvm,
129 struct iwl_mac_power_cmd *cmd)
130 {
131 IWL_DEBUG_POWER(mvm,
132 "Sending power table command on mac id 0x%X for power level %d, flags = 0x%X\n",
133 cmd->id_and_color, iwlmvm_mod_params.power_scheme,
134 le16_to_cpu(cmd->flags));
135 IWL_DEBUG_POWER(mvm, "Keep alive = %u sec\n",
136 le16_to_cpu(cmd->keep_alive_seconds));
137
138 if (!(cmd->flags & cpu_to_le16(POWER_FLAGS_POWER_MANAGEMENT_ENA_MSK))) {
139 IWL_DEBUG_POWER(mvm, "Disable power management\n");
140 return;
141 }
142
143 IWL_DEBUG_POWER(mvm, "Rx timeout = %u usec\n",
144 le32_to_cpu(cmd->rx_data_timeout));
145 IWL_DEBUG_POWER(mvm, "Tx timeout = %u usec\n",
146 le32_to_cpu(cmd->tx_data_timeout));
147 if (cmd->flags & cpu_to_le16(POWER_FLAGS_SKIP_OVER_DTIM_MSK))
148 IWL_DEBUG_POWER(mvm, "DTIM periods to skip = %u\n",
149 cmd->skip_dtim_periods);
150 if (cmd->flags & cpu_to_le16(POWER_FLAGS_LPRX_ENA_MSK))
151 IWL_DEBUG_POWER(mvm, "LP RX RSSI threshold = %u\n",
152 cmd->lprx_rssi_threshold);
153 if (cmd->flags & cpu_to_le16(POWER_FLAGS_ADVANCE_PM_ENA_MSK)) {
154 IWL_DEBUG_POWER(mvm, "uAPSD enabled\n");
155 IWL_DEBUG_POWER(mvm, "Rx timeout (uAPSD) = %u usec\n",
156 le32_to_cpu(cmd->rx_data_timeout_uapsd));
157 IWL_DEBUG_POWER(mvm, "Tx timeout (uAPSD) = %u usec\n",
158 le32_to_cpu(cmd->tx_data_timeout_uapsd));
159 IWL_DEBUG_POWER(mvm, "QNDP TID = %d\n", cmd->qndp_tid);
160 IWL_DEBUG_POWER(mvm, "ACs flags = 0x%x\n", cmd->uapsd_ac_flags);
161 IWL_DEBUG_POWER(mvm, "Max SP = %d\n", cmd->uapsd_max_sp);
162 }
163 }
164
165 static void iwl_mvm_power_configure_uapsd(struct iwl_mvm *mvm,
166 struct ieee80211_vif *vif,
167 struct iwl_mac_power_cmd *cmd)
168 {
169 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
170 enum ieee80211_ac_numbers ac;
171 bool tid_found = false;
172
173 for (ac = IEEE80211_AC_VO; ac <= IEEE80211_AC_BK; ac++) {
174 if (!mvmvif->queue_params[ac].uapsd)
175 continue;
176
177 if (mvm->cur_ucode != IWL_UCODE_WOWLAN)
178 cmd->flags |=
179 cpu_to_le16(POWER_FLAGS_ADVANCE_PM_ENA_MSK);
180
181 cmd->uapsd_ac_flags |= BIT(ac);
182
183 /* QNDP TID - the highest TID with no admission control */
184 if (!tid_found && !mvmvif->queue_params[ac].acm) {
185 tid_found = true;
186 switch (ac) {
187 case IEEE80211_AC_VO:
188 cmd->qndp_tid = 6;
189 break;
190 case IEEE80211_AC_VI:
191 cmd->qndp_tid = 5;
192 break;
193 case IEEE80211_AC_BE:
194 cmd->qndp_tid = 0;
195 break;
196 case IEEE80211_AC_BK:
197 cmd->qndp_tid = 1;
198 break;
199 }
200 }
201 }
202
203 if (!(cmd->flags & cpu_to_le16(POWER_FLAGS_ADVANCE_PM_ENA_MSK))) {
204 #ifdef CONFIG_IWLWIFI_DEBUGFS
205 /* set advanced pm flag with no uapsd ACs to enable ps-poll */
206 if (mvmvif->dbgfs_pm.use_ps_poll)
207 cmd->flags |=
208 cpu_to_le16(POWER_FLAGS_ADVANCE_PM_ENA_MSK);
209 #endif
210 return;
211 }
212
213 cmd->flags |= cpu_to_le16(POWER_FLAGS_UAPSD_MISBEHAVING_ENA_MSK);
214
215 if (cmd->uapsd_ac_flags == (BIT(IEEE80211_AC_VO) |
216 BIT(IEEE80211_AC_VI) |
217 BIT(IEEE80211_AC_BE) |
218 BIT(IEEE80211_AC_BK))) {
219 cmd->flags |= cpu_to_le16(POWER_FLAGS_SNOOZE_ENA_MSK);
220 cmd->snooze_interval = cpu_to_le16(IWL_MVM_PS_SNOOZE_INTERVAL);
221 cmd->snooze_window = (mvm->cur_ucode == IWL_UCODE_WOWLAN) ?
222 cpu_to_le16(IWL_MVM_WOWLAN_PS_SNOOZE_WINDOW) :
223 cpu_to_le16(IWL_MVM_PS_SNOOZE_WINDOW);
224 }
225
226 cmd->uapsd_max_sp = IWL_UAPSD_MAX_SP;
227
228 if (mvm->cur_ucode == IWL_UCODE_WOWLAN || cmd->flags &
229 cpu_to_le16(POWER_FLAGS_SNOOZE_ENA_MSK)) {
230 cmd->rx_data_timeout_uapsd =
231 cpu_to_le32(IWL_MVM_WOWLAN_PS_RX_DATA_TIMEOUT);
232 cmd->tx_data_timeout_uapsd =
233 cpu_to_le32(IWL_MVM_WOWLAN_PS_TX_DATA_TIMEOUT);
234 } else {
235 cmd->rx_data_timeout_uapsd =
236 cpu_to_le32(IWL_MVM_UAPSD_RX_DATA_TIMEOUT);
237 cmd->tx_data_timeout_uapsd =
238 cpu_to_le32(IWL_MVM_UAPSD_TX_DATA_TIMEOUT);
239 }
240
241 if (cmd->flags & cpu_to_le16(POWER_FLAGS_SNOOZE_ENA_MSK)) {
242 cmd->heavy_tx_thld_packets =
243 IWL_MVM_PS_SNOOZE_HEAVY_TX_THLD_PACKETS;
244 cmd->heavy_rx_thld_packets =
245 IWL_MVM_PS_SNOOZE_HEAVY_RX_THLD_PACKETS;
246 } else {
247 cmd->heavy_tx_thld_packets =
248 IWL_MVM_PS_HEAVY_TX_THLD_PACKETS;
249 cmd->heavy_rx_thld_packets =
250 IWL_MVM_PS_HEAVY_RX_THLD_PACKETS;
251 }
252 cmd->heavy_tx_thld_percentage =
253 IWL_MVM_PS_HEAVY_TX_THLD_PERCENT;
254 cmd->heavy_rx_thld_percentage =
255 IWL_MVM_PS_HEAVY_RX_THLD_PERCENT;
256 }
257
258 static bool iwl_mvm_power_allow_uapsd(struct iwl_mvm *mvm,
259 struct ieee80211_vif *vif)
260 {
261 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
262
263 if (!memcmp(mvmvif->uapsd_misbehaving_bssid, vif->bss_conf.bssid,
264 ETH_ALEN))
265 return false;
266
267 if (vif->p2p &&
268 !(mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_P2P_PS_UAPSD))
269 return false;
270 /*
271 * Avoid using uAPSD if P2P client is associated to GO that uses
272 * opportunistic power save. This is due to current FW limitation.
273 */
274 if (vif->p2p &&
275 (vif->bss_conf.p2p_noa_attr.oppps_ctwindow &
276 IEEE80211_P2P_OPPPS_ENABLE_BIT))
277 return false;
278
279 /*
280 * Avoid using uAPSD if client is in DCM -
281 * low latency issue in Miracast
282 */
283 if (iwl_mvm_phy_ctx_count(mvm) >= 2)
284 return false;
285
286 return true;
287 }
288
289 static bool iwl_mvm_power_is_radar(struct ieee80211_vif *vif)
290 {
291 struct ieee80211_chanctx_conf *chanctx_conf;
292 struct ieee80211_channel *chan;
293 bool radar_detect = false;
294
295 rcu_read_lock();
296 chanctx_conf = rcu_dereference(vif->chanctx_conf);
297 WARN_ON(!chanctx_conf);
298 if (chanctx_conf) {
299 chan = chanctx_conf->def.chan;
300 radar_detect = chan->flags & IEEE80211_CHAN_RADAR;
301 }
302 rcu_read_unlock();
303
304 return radar_detect;
305 }
306
307 static void iwl_mvm_power_build_cmd(struct iwl_mvm *mvm,
308 struct ieee80211_vif *vif,
309 struct iwl_mac_power_cmd *cmd)
310 {
311 int dtimper, dtimper_msec;
312 int keep_alive;
313 bool radar_detect = false;
314 struct iwl_mvm_vif *mvmvif __maybe_unused =
315 iwl_mvm_vif_from_mac80211(vif);
316
317 cmd->id_and_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id,
318 mvmvif->color));
319 dtimper = vif->bss_conf.dtim_period;
320
321 /*
322 * Regardless of power management state the driver must set
323 * keep alive period. FW will use it for sending keep alive NDPs
324 * immediately after association. Check that keep alive period
325 * is at least 3 * DTIM
326 */
327 dtimper_msec = dtimper * vif->bss_conf.beacon_int;
328 keep_alive = max_t(int, 3 * dtimper_msec,
329 MSEC_PER_SEC * POWER_KEEP_ALIVE_PERIOD_SEC);
330 keep_alive = DIV_ROUND_UP(keep_alive, MSEC_PER_SEC);
331 cmd->keep_alive_seconds = cpu_to_le16(keep_alive);
332
333 if (mvm->ps_disabled)
334 return;
335
336 cmd->flags |= cpu_to_le16(POWER_FLAGS_POWER_SAVE_ENA_MSK);
337
338 if (!vif->bss_conf.ps || iwl_mvm_vif_low_latency(mvmvif) ||
339 !mvmvif->pm_enabled || iwl_mvm_tdls_sta_count(mvm, vif))
340 return;
341
342 cmd->flags |= cpu_to_le16(POWER_FLAGS_POWER_MANAGEMENT_ENA_MSK);
343
344 if (vif->bss_conf.beacon_rate &&
345 (vif->bss_conf.beacon_rate->bitrate == 10 ||
346 vif->bss_conf.beacon_rate->bitrate == 60)) {
347 cmd->flags |= cpu_to_le16(POWER_FLAGS_LPRX_ENA_MSK);
348 cmd->lprx_rssi_threshold = POWER_LPRX_RSSI_THRESHOLD;
349 }
350
351 /* Check if radar detection is required on current channel */
352 radar_detect = iwl_mvm_power_is_radar(vif);
353
354 /* Check skip over DTIM conditions */
355 if (!radar_detect && (dtimper <= 10) &&
356 (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_LP ||
357 mvm->cur_ucode == IWL_UCODE_WOWLAN)) {
358 cmd->flags |= cpu_to_le16(POWER_FLAGS_SKIP_OVER_DTIM_MSK);
359 cmd->skip_dtim_periods = 3;
360 }
361
362 if (mvm->cur_ucode != IWL_UCODE_WOWLAN) {
363 cmd->rx_data_timeout =
364 cpu_to_le32(IWL_MVM_DEFAULT_PS_RX_DATA_TIMEOUT);
365 cmd->tx_data_timeout =
366 cpu_to_le32(IWL_MVM_DEFAULT_PS_TX_DATA_TIMEOUT);
367 } else {
368 cmd->rx_data_timeout =
369 cpu_to_le32(IWL_MVM_WOWLAN_PS_RX_DATA_TIMEOUT);
370 cmd->tx_data_timeout =
371 cpu_to_le32(IWL_MVM_WOWLAN_PS_TX_DATA_TIMEOUT);
372 }
373
374 if (iwl_mvm_power_allow_uapsd(mvm, vif))
375 iwl_mvm_power_configure_uapsd(mvm, vif, cmd);
376
377 #ifdef CONFIG_IWLWIFI_DEBUGFS
378 if (mvmvif->dbgfs_pm.mask & MVM_DEBUGFS_PM_KEEP_ALIVE)
379 cmd->keep_alive_seconds =
380 cpu_to_le16(mvmvif->dbgfs_pm.keep_alive_seconds);
381 if (mvmvif->dbgfs_pm.mask & MVM_DEBUGFS_PM_SKIP_OVER_DTIM) {
382 if (mvmvif->dbgfs_pm.skip_over_dtim)
383 cmd->flags |=
384 cpu_to_le16(POWER_FLAGS_SKIP_OVER_DTIM_MSK);
385 else
386 cmd->flags &=
387 cpu_to_le16(~POWER_FLAGS_SKIP_OVER_DTIM_MSK);
388 }
389 if (mvmvif->dbgfs_pm.mask & MVM_DEBUGFS_PM_RX_DATA_TIMEOUT)
390 cmd->rx_data_timeout =
391 cpu_to_le32(mvmvif->dbgfs_pm.rx_data_timeout);
392 if (mvmvif->dbgfs_pm.mask & MVM_DEBUGFS_PM_TX_DATA_TIMEOUT)
393 cmd->tx_data_timeout =
394 cpu_to_le32(mvmvif->dbgfs_pm.tx_data_timeout);
395 if (mvmvif->dbgfs_pm.mask & MVM_DEBUGFS_PM_SKIP_DTIM_PERIODS)
396 cmd->skip_dtim_periods = mvmvif->dbgfs_pm.skip_dtim_periods;
397 if (mvmvif->dbgfs_pm.mask & MVM_DEBUGFS_PM_LPRX_ENA) {
398 if (mvmvif->dbgfs_pm.lprx_ena)
399 cmd->flags |= cpu_to_le16(POWER_FLAGS_LPRX_ENA_MSK);
400 else
401 cmd->flags &= cpu_to_le16(~POWER_FLAGS_LPRX_ENA_MSK);
402 }
403 if (mvmvif->dbgfs_pm.mask & MVM_DEBUGFS_PM_LPRX_RSSI_THRESHOLD)
404 cmd->lprx_rssi_threshold = mvmvif->dbgfs_pm.lprx_rssi_threshold;
405 if (mvmvif->dbgfs_pm.mask & MVM_DEBUGFS_PM_SNOOZE_ENABLE) {
406 if (mvmvif->dbgfs_pm.snooze_ena)
407 cmd->flags |=
408 cpu_to_le16(POWER_FLAGS_SNOOZE_ENA_MSK);
409 else
410 cmd->flags &=
411 cpu_to_le16(~POWER_FLAGS_SNOOZE_ENA_MSK);
412 }
413 if (mvmvif->dbgfs_pm.mask & MVM_DEBUGFS_PM_UAPSD_MISBEHAVING) {
414 u16 flag = POWER_FLAGS_UAPSD_MISBEHAVING_ENA_MSK;
415 if (mvmvif->dbgfs_pm.uapsd_misbehaving)
416 cmd->flags |= cpu_to_le16(flag);
417 else
418 cmd->flags &= cpu_to_le16(flag);
419 }
420 #endif /* CONFIG_IWLWIFI_DEBUGFS */
421 }
422
423 static int iwl_mvm_power_send_cmd(struct iwl_mvm *mvm,
424 struct ieee80211_vif *vif)
425 {
426 struct iwl_mac_power_cmd cmd = {};
427
428 iwl_mvm_power_build_cmd(mvm, vif, &cmd);
429 iwl_mvm_power_log(mvm, &cmd);
430 #ifdef CONFIG_IWLWIFI_DEBUGFS
431 memcpy(&iwl_mvm_vif_from_mac80211(vif)->mac_pwr_cmd, &cmd, sizeof(cmd));
432 #endif
433
434 return iwl_mvm_send_cmd_pdu(mvm, MAC_PM_POWER_TABLE, 0,
435 sizeof(cmd), &cmd);
436 }
437
438 int iwl_mvm_power_update_device(struct iwl_mvm *mvm)
439 {
440 struct iwl_device_power_cmd cmd = {
441 .flags = cpu_to_le16(DEVICE_POWER_FLAGS_POWER_SAVE_ENA_MSK),
442 };
443
444 if (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM)
445 mvm->ps_disabled = true;
446
447 if (mvm->ps_disabled)
448 cmd.flags |= cpu_to_le16(DEVICE_POWER_FLAGS_CAM_MSK);
449
450 #ifdef CONFIG_IWLWIFI_DEBUGFS
451 if ((mvm->cur_ucode == IWL_UCODE_WOWLAN) ? mvm->disable_power_off_d3 :
452 mvm->disable_power_off)
453 cmd.flags &=
454 cpu_to_le16(~DEVICE_POWER_FLAGS_POWER_SAVE_ENA_MSK);
455 #endif
456 IWL_DEBUG_POWER(mvm,
457 "Sending device power command with flags = 0x%X\n",
458 cmd.flags);
459
460 return iwl_mvm_send_cmd_pdu(mvm, POWER_TABLE_CMD, 0, sizeof(cmd),
461 &cmd);
462 }
463
464 void iwl_mvm_power_vif_assoc(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
465 {
466 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
467
468 if (memcmp(vif->bss_conf.bssid, mvmvif->uapsd_misbehaving_bssid,
469 ETH_ALEN))
470 memset(mvmvif->uapsd_misbehaving_bssid, 0, ETH_ALEN);
471 }
472
473 static void iwl_mvm_power_uapsd_misbehav_ap_iterator(void *_data, u8 *mac,
474 struct ieee80211_vif *vif)
475 {
476 u8 *ap_sta_id = _data;
477 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
478
479 /* The ap_sta_id is not expected to change during current association
480 * so no explicit protection is needed
481 */
482 if (mvmvif->ap_sta_id == *ap_sta_id)
483 memcpy(mvmvif->uapsd_misbehaving_bssid, vif->bss_conf.bssid,
484 ETH_ALEN);
485 }
486
487 int iwl_mvm_power_uapsd_misbehaving_ap_notif(struct iwl_mvm *mvm,
488 struct iwl_rx_cmd_buffer *rxb,
489 struct iwl_device_cmd *cmd)
490 {
491 struct iwl_rx_packet *pkt = rxb_addr(rxb);
492 struct iwl_uapsd_misbehaving_ap_notif *notif = (void *)pkt->data;
493 u8 ap_sta_id = le32_to_cpu(notif->sta_id);
494
495 ieee80211_iterate_active_interfaces_atomic(
496 mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
497 iwl_mvm_power_uapsd_misbehav_ap_iterator, &ap_sta_id);
498
499 return 0;
500 }
501
502 struct iwl_power_vifs {
503 struct iwl_mvm *mvm;
504 struct ieee80211_vif *bf_vif;
505 struct ieee80211_vif *bss_vif;
506 struct ieee80211_vif *p2p_vif;
507 struct ieee80211_vif *ap_vif;
508 struct ieee80211_vif *monitor_vif;
509 bool p2p_active;
510 bool bss_active;
511 bool ap_active;
512 bool monitor_active;
513 };
514
515 static void iwl_mvm_power_disable_pm_iterator(void *_data, u8* mac,
516 struct ieee80211_vif *vif)
517 {
518 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
519
520 mvmvif->pm_enabled = false;
521 }
522
523 static void iwl_mvm_power_ps_disabled_iterator(void *_data, u8* mac,
524 struct ieee80211_vif *vif)
525 {
526 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
527 bool *disable_ps = _data;
528
529 if (mvmvif->phy_ctxt)
530 if (mvmvif->phy_ctxt->id < MAX_PHYS)
531 *disable_ps |= mvmvif->ps_disabled;
532 }
533
534 static void iwl_mvm_power_get_vifs_iterator(void *_data, u8 *mac,
535 struct ieee80211_vif *vif)
536 {
537 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
538 struct iwl_power_vifs *power_iterator = _data;
539
540 switch (ieee80211_vif_type_p2p(vif)) {
541 case NL80211_IFTYPE_P2P_DEVICE:
542 break;
543
544 case NL80211_IFTYPE_P2P_GO:
545 case NL80211_IFTYPE_AP:
546 /* only a single MAC of the same type */
547 WARN_ON(power_iterator->ap_vif);
548 power_iterator->ap_vif = vif;
549 if (mvmvif->phy_ctxt)
550 if (mvmvif->phy_ctxt->id < MAX_PHYS)
551 power_iterator->ap_active = true;
552 break;
553
554 case NL80211_IFTYPE_MONITOR:
555 /* only a single MAC of the same type */
556 WARN_ON(power_iterator->monitor_vif);
557 power_iterator->monitor_vif = vif;
558 if (mvmvif->phy_ctxt)
559 if (mvmvif->phy_ctxt->id < MAX_PHYS)
560 power_iterator->monitor_active = true;
561 break;
562
563 case NL80211_IFTYPE_P2P_CLIENT:
564 /* only a single MAC of the same type */
565 WARN_ON(power_iterator->p2p_vif);
566 power_iterator->p2p_vif = vif;
567 if (mvmvif->phy_ctxt)
568 if (mvmvif->phy_ctxt->id < MAX_PHYS)
569 power_iterator->p2p_active = true;
570 break;
571
572 case NL80211_IFTYPE_STATION:
573 /* only a single MAC of the same type */
574 WARN_ON(power_iterator->bss_vif);
575 power_iterator->bss_vif = vif;
576 if (mvmvif->phy_ctxt)
577 if (mvmvif->phy_ctxt->id < MAX_PHYS)
578 power_iterator->bss_active = true;
579
580 if (mvmvif->bf_data.bf_enabled &&
581 !WARN_ON(power_iterator->bf_vif))
582 power_iterator->bf_vif = vif;
583
584 break;
585
586 default:
587 break;
588 }
589 }
590
591 static void iwl_mvm_power_set_pm(struct iwl_mvm *mvm,
592 struct iwl_power_vifs *vifs)
593 {
594 struct iwl_mvm_vif *bss_mvmvif = NULL;
595 struct iwl_mvm_vif *p2p_mvmvif = NULL;
596 struct iwl_mvm_vif *ap_mvmvif = NULL;
597 bool client_same_channel = false;
598 bool ap_same_channel = false;
599
600 lockdep_assert_held(&mvm->mutex);
601
602 /* set pm_enable to false */
603 ieee80211_iterate_active_interfaces_atomic(mvm->hw,
604 IEEE80211_IFACE_ITER_NORMAL,
605 iwl_mvm_power_disable_pm_iterator,
606 NULL);
607
608 if (vifs->bss_vif)
609 bss_mvmvif = iwl_mvm_vif_from_mac80211(vifs->bss_vif);
610
611 if (vifs->p2p_vif)
612 p2p_mvmvif = iwl_mvm_vif_from_mac80211(vifs->p2p_vif);
613
614 if (vifs->ap_vif)
615 ap_mvmvif = iwl_mvm_vif_from_mac80211(vifs->ap_vif);
616
617 /* enable PM on bss if bss stand alone */
618 if (vifs->bss_active && !vifs->p2p_active && !vifs->ap_active) {
619 bss_mvmvif->pm_enabled = true;
620 return;
621 }
622
623 /* enable PM on p2p if p2p stand alone */
624 if (vifs->p2p_active && !vifs->bss_active && !vifs->ap_active) {
625 if (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_P2P_PM)
626 p2p_mvmvif->pm_enabled = true;
627 return;
628 }
629
630 if (vifs->bss_active && vifs->p2p_active)
631 client_same_channel = (bss_mvmvif->phy_ctxt->id ==
632 p2p_mvmvif->phy_ctxt->id);
633 if (vifs->bss_active && vifs->ap_active)
634 ap_same_channel = (bss_mvmvif->phy_ctxt->id ==
635 ap_mvmvif->phy_ctxt->id);
636
637 /* clients are not stand alone: enable PM if DCM */
638 if (!(client_same_channel || ap_same_channel) &&
639 (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_BSS_P2P_PS_DCM)) {
640 if (vifs->bss_active)
641 bss_mvmvif->pm_enabled = true;
642 if (vifs->p2p_active &&
643 (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_P2P_PM))
644 p2p_mvmvif->pm_enabled = true;
645 return;
646 }
647
648 /*
649 * There is only one channel in the system and there are only
650 * bss and p2p clients that share it
651 */
652 if (client_same_channel && !vifs->ap_active &&
653 (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_BSS_P2P_PS_SCM)) {
654 /* share same channel*/
655 bss_mvmvif->pm_enabled = true;
656 if (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_P2P_PM)
657 p2p_mvmvif->pm_enabled = true;
658 }
659 }
660
661 #ifdef CONFIG_IWLWIFI_DEBUGFS
662 int iwl_mvm_power_mac_dbgfs_read(struct iwl_mvm *mvm,
663 struct ieee80211_vif *vif, char *buf,
664 int bufsz)
665 {
666 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
667 struct iwl_mac_power_cmd cmd = {};
668 int pos = 0;
669
670 mutex_lock(&mvm->mutex);
671 memcpy(&cmd, &mvmvif->mac_pwr_cmd, sizeof(cmd));
672 mutex_unlock(&mvm->mutex);
673
674 pos += scnprintf(buf+pos, bufsz-pos, "power_scheme = %d\n",
675 iwlmvm_mod_params.power_scheme);
676 pos += scnprintf(buf+pos, bufsz-pos, "flags = 0x%x\n",
677 le16_to_cpu(cmd.flags));
678 pos += scnprintf(buf+pos, bufsz-pos, "keep_alive = %d\n",
679 le16_to_cpu(cmd.keep_alive_seconds));
680
681 if (!(cmd.flags & cpu_to_le16(POWER_FLAGS_POWER_MANAGEMENT_ENA_MSK)))
682 return pos;
683
684 pos += scnprintf(buf+pos, bufsz-pos, "skip_over_dtim = %d\n",
685 (cmd.flags &
686 cpu_to_le16(POWER_FLAGS_SKIP_OVER_DTIM_MSK)) ? 1 : 0);
687 pos += scnprintf(buf+pos, bufsz-pos, "skip_dtim_periods = %d\n",
688 cmd.skip_dtim_periods);
689 if (!(cmd.flags & cpu_to_le16(POWER_FLAGS_ADVANCE_PM_ENA_MSK))) {
690 pos += scnprintf(buf+pos, bufsz-pos, "rx_data_timeout = %d\n",
691 le32_to_cpu(cmd.rx_data_timeout));
692 pos += scnprintf(buf+pos, bufsz-pos, "tx_data_timeout = %d\n",
693 le32_to_cpu(cmd.tx_data_timeout));
694 }
695 if (cmd.flags & cpu_to_le16(POWER_FLAGS_LPRX_ENA_MSK))
696 pos += scnprintf(buf+pos, bufsz-pos,
697 "lprx_rssi_threshold = %d\n",
698 cmd.lprx_rssi_threshold);
699
700 if (!(cmd.flags & cpu_to_le16(POWER_FLAGS_ADVANCE_PM_ENA_MSK)))
701 return pos;
702
703 pos += scnprintf(buf+pos, bufsz-pos, "rx_data_timeout_uapsd = %d\n",
704 le32_to_cpu(cmd.rx_data_timeout_uapsd));
705 pos += scnprintf(buf+pos, bufsz-pos, "tx_data_timeout_uapsd = %d\n",
706 le32_to_cpu(cmd.tx_data_timeout_uapsd));
707 pos += scnprintf(buf+pos, bufsz-pos, "qndp_tid = %d\n", cmd.qndp_tid);
708 pos += scnprintf(buf+pos, bufsz-pos, "uapsd_ac_flags = 0x%x\n",
709 cmd.uapsd_ac_flags);
710 pos += scnprintf(buf+pos, bufsz-pos, "uapsd_max_sp = %d\n",
711 cmd.uapsd_max_sp);
712 pos += scnprintf(buf+pos, bufsz-pos, "heavy_tx_thld_packets = %d\n",
713 cmd.heavy_tx_thld_packets);
714 pos += scnprintf(buf+pos, bufsz-pos, "heavy_rx_thld_packets = %d\n",
715 cmd.heavy_rx_thld_packets);
716 pos += scnprintf(buf+pos, bufsz-pos, "heavy_tx_thld_percentage = %d\n",
717 cmd.heavy_tx_thld_percentage);
718 pos += scnprintf(buf+pos, bufsz-pos, "heavy_rx_thld_percentage = %d\n",
719 cmd.heavy_rx_thld_percentage);
720 pos += scnprintf(buf+pos, bufsz-pos, "uapsd_misbehaving_enable = %d\n",
721 (cmd.flags &
722 cpu_to_le16(POWER_FLAGS_UAPSD_MISBEHAVING_ENA_MSK)) ?
723 1 : 0);
724
725 if (!(cmd.flags & cpu_to_le16(POWER_FLAGS_SNOOZE_ENA_MSK)))
726 return pos;
727
728 pos += scnprintf(buf+pos, bufsz-pos, "snooze_interval = %d\n",
729 cmd.snooze_interval);
730 pos += scnprintf(buf+pos, bufsz-pos, "snooze_window = %d\n",
731 cmd.snooze_window);
732
733 return pos;
734 }
735
736 void
737 iwl_mvm_beacon_filter_debugfs_parameters(struct ieee80211_vif *vif,
738 struct iwl_beacon_filter_cmd *cmd)
739 {
740 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
741 struct iwl_dbgfs_bf *dbgfs_bf = &mvmvif->dbgfs_bf;
742
743 if (dbgfs_bf->mask & MVM_DEBUGFS_BF_ENERGY_DELTA)
744 cmd->bf_energy_delta = cpu_to_le32(dbgfs_bf->bf_energy_delta);
745 if (dbgfs_bf->mask & MVM_DEBUGFS_BF_ROAMING_ENERGY_DELTA)
746 cmd->bf_roaming_energy_delta =
747 cpu_to_le32(dbgfs_bf->bf_roaming_energy_delta);
748 if (dbgfs_bf->mask & MVM_DEBUGFS_BF_ROAMING_STATE)
749 cmd->bf_roaming_state = cpu_to_le32(dbgfs_bf->bf_roaming_state);
750 if (dbgfs_bf->mask & MVM_DEBUGFS_BF_TEMP_THRESHOLD)
751 cmd->bf_temp_threshold =
752 cpu_to_le32(dbgfs_bf->bf_temp_threshold);
753 if (dbgfs_bf->mask & MVM_DEBUGFS_BF_TEMP_FAST_FILTER)
754 cmd->bf_temp_fast_filter =
755 cpu_to_le32(dbgfs_bf->bf_temp_fast_filter);
756 if (dbgfs_bf->mask & MVM_DEBUGFS_BF_TEMP_SLOW_FILTER)
757 cmd->bf_temp_slow_filter =
758 cpu_to_le32(dbgfs_bf->bf_temp_slow_filter);
759 if (dbgfs_bf->mask & MVM_DEBUGFS_BF_DEBUG_FLAG)
760 cmd->bf_debug_flag = cpu_to_le32(dbgfs_bf->bf_debug_flag);
761 if (dbgfs_bf->mask & MVM_DEBUGFS_BF_ESCAPE_TIMER)
762 cmd->bf_escape_timer = cpu_to_le32(dbgfs_bf->bf_escape_timer);
763 if (dbgfs_bf->mask & MVM_DEBUGFS_BA_ESCAPE_TIMER)
764 cmd->ba_escape_timer = cpu_to_le32(dbgfs_bf->ba_escape_timer);
765 if (dbgfs_bf->mask & MVM_DEBUGFS_BA_ENABLE_BEACON_ABORT)
766 cmd->ba_enable_beacon_abort =
767 cpu_to_le32(dbgfs_bf->ba_enable_beacon_abort);
768 }
769 #endif
770
771 static int _iwl_mvm_enable_beacon_filter(struct iwl_mvm *mvm,
772 struct ieee80211_vif *vif,
773 struct iwl_beacon_filter_cmd *cmd,
774 u32 cmd_flags,
775 bool d0i3)
776 {
777 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
778 int ret;
779
780 if (mvmvif != mvm->bf_allowed_vif || !vif->bss_conf.dtim_period ||
781 vif->type != NL80211_IFTYPE_STATION || vif->p2p)
782 return 0;
783
784 iwl_mvm_beacon_filter_set_cqm_params(mvm, vif, cmd);
785 if (!d0i3)
786 iwl_mvm_beacon_filter_debugfs_parameters(vif, cmd);
787 ret = iwl_mvm_beacon_filter_send_cmd(mvm, cmd, cmd_flags);
788
789 /* don't change bf_enabled in case of temporary d0i3 configuration */
790 if (!ret && !d0i3)
791 mvmvif->bf_data.bf_enabled = true;
792
793 return ret;
794 }
795
796 int iwl_mvm_enable_beacon_filter(struct iwl_mvm *mvm,
797 struct ieee80211_vif *vif,
798 u32 flags)
799 {
800 struct iwl_beacon_filter_cmd cmd = {
801 IWL_BF_CMD_CONFIG_DEFAULTS,
802 .bf_enable_beacon_filter = cpu_to_le32(1),
803 };
804
805 return _iwl_mvm_enable_beacon_filter(mvm, vif, &cmd, flags, false);
806 }
807
808 static int iwl_mvm_update_beacon_abort(struct iwl_mvm *mvm,
809 struct ieee80211_vif *vif,
810 bool enable)
811 {
812 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
813 struct iwl_beacon_filter_cmd cmd = {
814 IWL_BF_CMD_CONFIG_DEFAULTS,
815 .bf_enable_beacon_filter = cpu_to_le32(1),
816 };
817
818 if (!mvmvif->bf_data.bf_enabled)
819 return 0;
820
821 if (mvm->cur_ucode == IWL_UCODE_WOWLAN)
822 cmd.ba_escape_timer = cpu_to_le32(IWL_BA_ESCAPE_TIMER_D3);
823
824 mvmvif->bf_data.ba_enabled = enable;
825 return _iwl_mvm_enable_beacon_filter(mvm, vif, &cmd, 0, false);
826 }
827
828 int iwl_mvm_disable_beacon_filter(struct iwl_mvm *mvm,
829 struct ieee80211_vif *vif,
830 u32 flags)
831 {
832 struct iwl_beacon_filter_cmd cmd = {};
833 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
834 int ret;
835
836 if (vif->type != NL80211_IFTYPE_STATION || vif->p2p)
837 return 0;
838
839 ret = iwl_mvm_beacon_filter_send_cmd(mvm, &cmd, flags);
840
841 if (!ret)
842 mvmvif->bf_data.bf_enabled = false;
843
844 return ret;
845 }
846
847 static int iwl_mvm_power_set_ps(struct iwl_mvm *mvm)
848 {
849 bool disable_ps;
850 int ret;
851
852 /* disable PS if CAM */
853 disable_ps = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
854 /* ...or if any of the vifs require PS to be off */
855 ieee80211_iterate_active_interfaces_atomic(mvm->hw,
856 IEEE80211_IFACE_ITER_NORMAL,
857 iwl_mvm_power_ps_disabled_iterator,
858 &disable_ps);
859
860 /* update device power state if it has changed */
861 if (mvm->ps_disabled != disable_ps) {
862 bool old_ps_disabled = mvm->ps_disabled;
863
864 mvm->ps_disabled = disable_ps;
865 ret = iwl_mvm_power_update_device(mvm);
866 if (ret) {
867 mvm->ps_disabled = old_ps_disabled;
868 return ret;
869 }
870 }
871
872 return 0;
873 }
874
875 static int iwl_mvm_power_set_ba(struct iwl_mvm *mvm,
876 struct iwl_power_vifs *vifs)
877 {
878 struct iwl_mvm_vif *mvmvif;
879 bool ba_enable;
880
881 if (!vifs->bf_vif)
882 return 0;
883
884 mvmvif = iwl_mvm_vif_from_mac80211(vifs->bf_vif);
885
886 ba_enable = !(!mvmvif->pm_enabled || mvm->ps_disabled ||
887 !vifs->bf_vif->bss_conf.ps ||
888 iwl_mvm_vif_low_latency(mvmvif));
889
890 return iwl_mvm_update_beacon_abort(mvm, vifs->bf_vif, ba_enable);
891 }
892
893 int iwl_mvm_power_update_ps(struct iwl_mvm *mvm)
894 {
895 struct iwl_power_vifs vifs = {
896 .mvm = mvm,
897 };
898 int ret;
899
900 lockdep_assert_held(&mvm->mutex);
901
902 /* get vifs info */
903 ieee80211_iterate_active_interfaces_atomic(mvm->hw,
904 IEEE80211_IFACE_ITER_NORMAL,
905 iwl_mvm_power_get_vifs_iterator, &vifs);
906
907 ret = iwl_mvm_power_set_ps(mvm);
908 if (ret)
909 return ret;
910
911 return iwl_mvm_power_set_ba(mvm, &vifs);
912 }
913
914 int iwl_mvm_power_update_mac(struct iwl_mvm *mvm)
915 {
916 struct iwl_power_vifs vifs = {
917 .mvm = mvm,
918 };
919 int ret;
920
921 lockdep_assert_held(&mvm->mutex);
922
923 /* get vifs info */
924 ieee80211_iterate_active_interfaces_atomic(mvm->hw,
925 IEEE80211_IFACE_ITER_NORMAL,
926 iwl_mvm_power_get_vifs_iterator, &vifs);
927
928 iwl_mvm_power_set_pm(mvm, &vifs);
929
930 ret = iwl_mvm_power_set_ps(mvm);
931 if (ret)
932 return ret;
933
934 if (vifs.bss_vif) {
935 ret = iwl_mvm_power_send_cmd(mvm, vifs.bss_vif);
936 if (ret)
937 return ret;
938 }
939
940 if (vifs.p2p_vif) {
941 ret = iwl_mvm_power_send_cmd(mvm, vifs.p2p_vif);
942 if (ret)
943 return ret;
944 }
945
946 return iwl_mvm_power_set_ba(mvm, &vifs);
947 }
948
949 int iwl_mvm_update_d0i3_power_mode(struct iwl_mvm *mvm,
950 struct ieee80211_vif *vif,
951 bool enable, u32 flags)
952 {
953 int ret;
954 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
955 struct iwl_mac_power_cmd cmd = {};
956
957 if (vif->type != NL80211_IFTYPE_STATION || vif->p2p)
958 return 0;
959
960 if (!vif->bss_conf.assoc)
961 return 0;
962
963 iwl_mvm_power_build_cmd(mvm, vif, &cmd);
964 if (enable) {
965 /* configure skip over dtim up to 306TU - 314 msec */
966 int dtimper = vif->bss_conf.dtim_period ?: 1;
967 int dtimper_tu = dtimper * vif->bss_conf.beacon_int;
968 bool radar_detect = iwl_mvm_power_is_radar(vif);
969
970 if (WARN_ON(!dtimper_tu))
971 return 0;
972
973 /* Check skip over DTIM conditions */
974 /* TODO: check that multicast wake lock is off */
975 if (!radar_detect && (dtimper < 10)) {
976 cmd.skip_dtim_periods = 306 / dtimper_tu;
977 if (cmd.skip_dtim_periods)
978 cmd.flags |= cpu_to_le16(
979 POWER_FLAGS_SKIP_OVER_DTIM_MSK);
980 }
981 }
982 iwl_mvm_power_log(mvm, &cmd);
983 #ifdef CONFIG_IWLWIFI_DEBUGFS
984 memcpy(&mvmvif->mac_pwr_cmd, &cmd, sizeof(cmd));
985 #endif
986 ret = iwl_mvm_send_cmd_pdu(mvm, MAC_PM_POWER_TABLE, flags,
987 sizeof(cmd), &cmd);
988 if (ret)
989 return ret;
990
991 /* configure beacon filtering */
992 if (mvmvif != mvm->bf_allowed_vif)
993 return 0;
994
995 if (enable) {
996 struct iwl_beacon_filter_cmd cmd_bf = {
997 IWL_BF_CMD_CONFIG_D0I3,
998 .bf_enable_beacon_filter = cpu_to_le32(1),
999 };
1000 ret = _iwl_mvm_enable_beacon_filter(mvm, vif, &cmd_bf,
1001 flags, true);
1002 } else {
1003 if (mvmvif->bf_data.bf_enabled)
1004 ret = iwl_mvm_enable_beacon_filter(mvm, vif, flags);
1005 else
1006 ret = iwl_mvm_disable_beacon_filter(mvm, vif, flags);
1007 }
1008
1009 return ret;
1010 }
Linux kernel - Deliverables
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