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 * Copyright(c) 2015 - 2016 Intel Deutschland GmbH 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of version 2 of the GNU General Public License as 14 * published by the Free Software Foundation. 15 * 16 * This program is distributed in the hope that it will be useful, but 17 * WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 19 * General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with this program; if not, write to the Free Software 23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110, 24 * USA 25 * 26 * The full GNU General Public License is included in this distribution 27 * in the file called COPYING. 28 * 29 * Contact Information: 30 * Intel Linux Wireless <linuxwifi@intel.com> 31 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 32 * 33 * BSD LICENSE 34 * 35 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved. 36 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH 37 * Copyright(c) 2015 - 2016 Intel Deutschland GmbH 38 * All rights reserved. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 44 * * Redistributions of source code must retain the above copyright 45 * notice, this list of conditions and the following disclaimer. 46 * * Redistributions in binary form must reproduce the above copyright 47 * notice, this list of conditions and the following disclaimer in 48 * the documentation and/or other materials provided with the 49 * distribution. 50 * * Neither the name Intel Corporation nor the names of its 51 * contributors may be used to endorse or promote products derived 52 * from this software without specific prior written permission. 53 * 54 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 55 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 56 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 57 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 58 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 59 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 60 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 61 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 62 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 63 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 64 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 65 * 66 *****************************************************************************/ 67 68 #include <linux/etherdevice.h> 69 #include <net/mac80211.h> 70 #include "iwl-io.h" 71 #include "iwl-prph.h" 72 #include "fw-api.h" 73 #include "mvm.h" 74 #include "time-event.h" 75 #include "fw-dbg.h" 76 77 const u8 iwl_mvm_ac_to_tx_fifo[] = { 78 IWL_MVM_TX_FIFO_VO, 79 IWL_MVM_TX_FIFO_VI, 80 IWL_MVM_TX_FIFO_BE, 81 IWL_MVM_TX_FIFO_BK, 82 }; 83 84 struct iwl_mvm_mac_iface_iterator_data { 85 struct iwl_mvm *mvm; 86 struct ieee80211_vif *vif; 87 unsigned long available_mac_ids[BITS_TO_LONGS(NUM_MAC_INDEX_DRIVER)]; 88 unsigned long available_tsf_ids[BITS_TO_LONGS(NUM_TSF_IDS)]; 89 enum iwl_tsf_id preferred_tsf; 90 bool found_vif; 91 }; 92 93 struct iwl_mvm_hw_queues_iface_iterator_data { 94 struct ieee80211_vif *exclude_vif; 95 unsigned long used_hw_queues; 96 }; 97 98 static void iwl_mvm_mac_tsf_id_iter(void *_data, u8 *mac, 99 struct ieee80211_vif *vif) 100 { 101 struct iwl_mvm_mac_iface_iterator_data *data = _data; 102 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif); 103 u16 min_bi; 104 105 /* Skip the interface for which we are trying to assign a tsf_id */ 106 if (vif == data->vif) 107 return; 108 109 /* 110 * The TSF is a hardware/firmware resource, there are 4 and 111 * the driver should assign and free them as needed. However, 112 * there are cases where 2 MACs should share the same TSF ID 113 * for the purpose of clock sync, an optimization to avoid 114 * clock drift causing overlapping TBTTs/DTIMs for a GO and 115 * client in the system. 116 * 117 * The firmware will decide according to the MAC type which 118 * will be the master and slave. Clients that need to sync 119 * with a remote station will be the master, and an AP or GO 120 * will be the slave. 121 * 122 * Depending on the new interface type it can be slaved to 123 * or become the master of an existing interface. 124 */ 125 switch (data->vif->type) { 126 case NL80211_IFTYPE_STATION: 127 /* 128 * The new interface is a client, so if the one we're iterating 129 * is an AP, and the beacon interval of the AP is a multiple or 130 * divisor of the beacon interval of the client, the same TSF 131 * should be used to avoid drift between the new client and 132 * existing AP. The existing AP will get drift updates from the 133 * new client context in this case. 134 */ 135 if (vif->type != NL80211_IFTYPE_AP || 136 data->preferred_tsf != NUM_TSF_IDS || 137 !test_bit(mvmvif->tsf_id, data->available_tsf_ids)) 138 break; 139 140 min_bi = min(data->vif->bss_conf.beacon_int, 141 vif->bss_conf.beacon_int); 142 143 if (!min_bi) 144 break; 145 146 if ((data->vif->bss_conf.beacon_int - 147 vif->bss_conf.beacon_int) % min_bi == 0) { 148 data->preferred_tsf = mvmvif->tsf_id; 149 return; 150 } 151 break; 152 153 case NL80211_IFTYPE_AP: 154 /* 155 * The new interface is AP/GO, so if its beacon interval is a 156 * multiple or a divisor of the beacon interval of an existing 157 * interface, it should get drift updates from an existing 158 * client or use the same TSF as an existing GO. There's no 159 * drift between TSFs internally but if they used different 160 * TSFs then a new client MAC could update one of them and 161 * cause drift that way. 162 */ 163 if ((vif->type != NL80211_IFTYPE_AP && 164 vif->type != NL80211_IFTYPE_STATION) || 165 data->preferred_tsf != NUM_TSF_IDS || 166 !test_bit(mvmvif->tsf_id, data->available_tsf_ids)) 167 break; 168 169 min_bi = min(data->vif->bss_conf.beacon_int, 170 vif->bss_conf.beacon_int); 171 172 if (!min_bi) 173 break; 174 175 if ((data->vif->bss_conf.beacon_int - 176 vif->bss_conf.beacon_int) % min_bi == 0) { 177 data->preferred_tsf = mvmvif->tsf_id; 178 return; 179 } 180 break; 181 default: 182 /* 183 * For all other interface types there's no need to 184 * take drift into account. Either they're exclusive 185 * like IBSS and monitor, or we don't care much about 186 * their TSF (like P2P Device), but we won't be able 187 * to share the TSF resource. 188 */ 189 break; 190 } 191 192 /* 193 * Unless we exited above, we can't share the TSF resource 194 * that the virtual interface we're iterating over is using 195 * with the new one, so clear the available bit and if this 196 * was the preferred one, reset that as well. 197 */ 198 __clear_bit(mvmvif->tsf_id, data->available_tsf_ids); 199 200 if (data->preferred_tsf == mvmvif->tsf_id) 201 data->preferred_tsf = NUM_TSF_IDS; 202 } 203 204 /* 205 * Get the mask of the queues used by the vif 206 */ 207 u32 iwl_mvm_mac_get_queues_mask(struct ieee80211_vif *vif) 208 { 209 u32 qmask = 0, ac; 210 211 if (vif->type == NL80211_IFTYPE_P2P_DEVICE) 212 return BIT(IWL_MVM_OFFCHANNEL_QUEUE); 213 214 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 215 if (vif->hw_queue[ac] != IEEE80211_INVAL_HW_QUEUE) 216 qmask |= BIT(vif->hw_queue[ac]); 217 } 218 219 if (vif->type == NL80211_IFTYPE_AP) 220 qmask |= BIT(vif->cab_queue); 221 222 return qmask; 223 } 224 225 static void iwl_mvm_iface_hw_queues_iter(void *_data, u8 *mac, 226 struct ieee80211_vif *vif) 227 { 228 struct iwl_mvm_hw_queues_iface_iterator_data *data = _data; 229 230 /* exclude the given vif */ 231 if (vif == data->exclude_vif) 232 return; 233 234 data->used_hw_queues |= iwl_mvm_mac_get_queues_mask(vif); 235 } 236 237 static void iwl_mvm_mac_sta_hw_queues_iter(void *_data, 238 struct ieee80211_sta *sta) 239 { 240 struct iwl_mvm_hw_queues_iface_iterator_data *data = _data; 241 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 242 243 /* Mark the queues used by the sta */ 244 data->used_hw_queues |= mvmsta->tfd_queue_msk; 245 } 246 247 unsigned long iwl_mvm_get_used_hw_queues(struct iwl_mvm *mvm, 248 struct ieee80211_vif *exclude_vif) 249 { 250 u8 sta_id; 251 struct iwl_mvm_hw_queues_iface_iterator_data data = { 252 .exclude_vif = exclude_vif, 253 .used_hw_queues = 254 BIT(IWL_MVM_OFFCHANNEL_QUEUE) | 255 BIT(mvm->aux_queue), 256 }; 257 258 if (iwl_mvm_is_dqa_supported(mvm)) 259 data.used_hw_queues |= BIT(IWL_MVM_DQA_CMD_QUEUE); 260 else 261 data.used_hw_queues |= BIT(IWL_MVM_CMD_QUEUE); 262 263 lockdep_assert_held(&mvm->mutex); 264 265 /* mark all VIF used hw queues */ 266 ieee80211_iterate_active_interfaces_atomic( 267 mvm->hw, IEEE80211_IFACE_ITER_RESUME_ALL, 268 iwl_mvm_iface_hw_queues_iter, &data); 269 270 /* don't assign the same hw queues as TDLS stations */ 271 ieee80211_iterate_stations_atomic(mvm->hw, 272 iwl_mvm_mac_sta_hw_queues_iter, 273 &data); 274 275 /* 276 * Some TDLS stations may be removed but are in the process of being 277 * drained. Don't touch their queues. 278 */ 279 for_each_set_bit(sta_id, mvm->sta_drained, IWL_MVM_STATION_COUNT) 280 data.used_hw_queues |= mvm->tfd_drained[sta_id]; 281 282 return data.used_hw_queues; 283 } 284 285 static void iwl_mvm_mac_iface_iterator(void *_data, u8 *mac, 286 struct ieee80211_vif *vif) 287 { 288 struct iwl_mvm_mac_iface_iterator_data *data = _data; 289 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif); 290 291 /* Iterator may already find the interface being added -- skip it */ 292 if (vif == data->vif) { 293 data->found_vif = true; 294 return; 295 } 296 297 /* Mark MAC IDs as used by clearing the available bit, and 298 * (below) mark TSFs as used if their existing use is not 299 * compatible with the new interface type. 300 * No locking or atomic bit operations are needed since the 301 * data is on the stack of the caller function. 302 */ 303 __clear_bit(mvmvif->id, data->available_mac_ids); 304 305 /* find a suitable tsf_id */ 306 iwl_mvm_mac_tsf_id_iter(_data, mac, vif); 307 } 308 309 void iwl_mvm_mac_ctxt_recalc_tsf_id(struct iwl_mvm *mvm, 310 struct ieee80211_vif *vif) 311 { 312 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif); 313 struct iwl_mvm_mac_iface_iterator_data data = { 314 .mvm = mvm, 315 .vif = vif, 316 .available_tsf_ids = { (1 << NUM_TSF_IDS) - 1 }, 317 /* no preference yet */ 318 .preferred_tsf = NUM_TSF_IDS, 319 }; 320 321 ieee80211_iterate_active_interfaces_atomic( 322 mvm->hw, IEEE80211_IFACE_ITER_RESUME_ALL, 323 iwl_mvm_mac_tsf_id_iter, &data); 324 325 if (data.preferred_tsf != NUM_TSF_IDS) 326 mvmvif->tsf_id = data.preferred_tsf; 327 else if (!test_bit(mvmvif->tsf_id, data.available_tsf_ids)) 328 mvmvif->tsf_id = find_first_bit(data.available_tsf_ids, 329 NUM_TSF_IDS); 330 } 331 332 static int iwl_mvm_mac_ctxt_allocate_resources(struct iwl_mvm *mvm, 333 struct ieee80211_vif *vif) 334 { 335 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif); 336 struct iwl_mvm_mac_iface_iterator_data data = { 337 .mvm = mvm, 338 .vif = vif, 339 .available_mac_ids = { (1 << NUM_MAC_INDEX_DRIVER) - 1 }, 340 .available_tsf_ids = { (1 << NUM_TSF_IDS) - 1 }, 341 /* no preference yet */ 342 .preferred_tsf = NUM_TSF_IDS, 343 .found_vif = false, 344 }; 345 u32 ac; 346 int ret, i; 347 unsigned long used_hw_queues; 348 349 /* 350 * Allocate a MAC ID and a TSF for this MAC, along with the queues 351 * and other resources. 352 */ 353 354 /* 355 * Before the iterator, we start with all MAC IDs and TSFs available. 356 * 357 * During iteration, all MAC IDs are cleared that are in use by other 358 * virtual interfaces, and all TSF IDs are cleared that can't be used 359 * by this new virtual interface because they're used by an interface 360 * that can't share it with the new one. 361 * At the same time, we check if there's a preferred TSF in the case 362 * that we should share it with another interface. 363 */ 364 365 /* Currently, MAC ID 0 should be used only for the managed/IBSS vif */ 366 switch (vif->type) { 367 case NL80211_IFTYPE_ADHOC: 368 break; 369 case NL80211_IFTYPE_STATION: 370 if (!vif->p2p) 371 break; 372 /* fall through */ 373 default: 374 __clear_bit(0, data.available_mac_ids); 375 } 376 377 ieee80211_iterate_active_interfaces_atomic( 378 mvm->hw, IEEE80211_IFACE_ITER_RESUME_ALL, 379 iwl_mvm_mac_iface_iterator, &data); 380 381 used_hw_queues = iwl_mvm_get_used_hw_queues(mvm, vif); 382 383 /* 384 * In the case we're getting here during resume, it's similar to 385 * firmware restart, and with RESUME_ALL the iterator will find 386 * the vif being added already. 387 * We don't want to reassign any IDs in either case since doing 388 * so would probably assign different IDs (as interfaces aren't 389 * necessarily added in the same order), but the old IDs were 390 * preserved anyway, so skip ID assignment for both resume and 391 * recovery. 392 */ 393 if (data.found_vif) 394 return 0; 395 396 /* Therefore, in recovery, we can't get here */ 397 if (WARN_ON_ONCE(test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status))) 398 return -EBUSY; 399 400 mvmvif->id = find_first_bit(data.available_mac_ids, 401 NUM_MAC_INDEX_DRIVER); 402 if (mvmvif->id == NUM_MAC_INDEX_DRIVER) { 403 IWL_ERR(mvm, "Failed to init MAC context - no free ID!\n"); 404 ret = -EIO; 405 goto exit_fail; 406 } 407 408 if (data.preferred_tsf != NUM_TSF_IDS) 409 mvmvif->tsf_id = data.preferred_tsf; 410 else 411 mvmvif->tsf_id = find_first_bit(data.available_tsf_ids, 412 NUM_TSF_IDS); 413 if (mvmvif->tsf_id == NUM_TSF_IDS) { 414 IWL_ERR(mvm, "Failed to init MAC context - no free TSF!\n"); 415 ret = -EIO; 416 goto exit_fail; 417 } 418 419 mvmvif->color = 0; 420 421 INIT_LIST_HEAD(&mvmvif->time_event_data.list); 422 mvmvif->time_event_data.id = TE_MAX; 423 424 /* No need to allocate data queues to P2P Device MAC.*/ 425 if (vif->type == NL80211_IFTYPE_P2P_DEVICE) { 426 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) 427 vif->hw_queue[ac] = IEEE80211_INVAL_HW_QUEUE; 428 429 return 0; 430 } 431 432 /* 433 * Find available queues, and allocate them to the ACs. When in 434 * DQA-mode they aren't really used, and this is done only so the 435 * mac80211 ieee80211_check_queues() function won't fail 436 */ 437 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { 438 u8 queue = find_first_zero_bit(&used_hw_queues, 439 mvm->first_agg_queue); 440 441 if (!iwl_mvm_is_dqa_supported(mvm) && 442 queue >= mvm->first_agg_queue) { 443 IWL_ERR(mvm, "Failed to allocate queue\n"); 444 ret = -EIO; 445 goto exit_fail; 446 } 447 448 __set_bit(queue, &used_hw_queues); 449 vif->hw_queue[ac] = queue; 450 } 451 452 /* Allocate the CAB queue for softAP and GO interfaces */ 453 if (vif->type == NL80211_IFTYPE_AP) { 454 u8 queue; 455 456 if (!iwl_mvm_is_dqa_supported(mvm)) { 457 queue = find_first_zero_bit(&used_hw_queues, 458 mvm->first_agg_queue); 459 460 if (queue >= mvm->first_agg_queue) { 461 IWL_ERR(mvm, "Failed to allocate cab queue\n"); 462 ret = -EIO; 463 goto exit_fail; 464 } 465 } else { 466 queue = IWL_MVM_DQA_GCAST_QUEUE; 467 } 468 469 vif->cab_queue = queue; 470 } else { 471 vif->cab_queue = IEEE80211_INVAL_HW_QUEUE; 472 } 473 474 mvmvif->bcast_sta.sta_id = IWL_MVM_STATION_COUNT; 475 mvmvif->ap_sta_id = IWL_MVM_STATION_COUNT; 476 477 for (i = 0; i < NUM_IWL_MVM_SMPS_REQ; i++) 478 mvmvif->smps_requests[i] = IEEE80211_SMPS_AUTOMATIC; 479 480 return 0; 481 482 exit_fail: 483 memset(mvmvif, 0, sizeof(struct iwl_mvm_vif)); 484 memset(vif->hw_queue, IEEE80211_INVAL_HW_QUEUE, sizeof(vif->hw_queue)); 485 vif->cab_queue = IEEE80211_INVAL_HW_QUEUE; 486 return ret; 487 } 488 489 int iwl_mvm_mac_ctxt_init(struct iwl_mvm *mvm, struct ieee80211_vif *vif) 490 { 491 unsigned int wdg_timeout = 492 iwl_mvm_get_wd_timeout(mvm, vif, false, false); 493 u32 ac; 494 int ret; 495 496 lockdep_assert_held(&mvm->mutex); 497 498 ret = iwl_mvm_mac_ctxt_allocate_resources(mvm, vif); 499 if (ret) 500 return ret; 501 502 switch (vif->type) { 503 case NL80211_IFTYPE_P2P_DEVICE: 504 if (!iwl_mvm_is_dqa_supported(mvm)) 505 iwl_mvm_enable_ac_txq(mvm, IWL_MVM_OFFCHANNEL_QUEUE, 506 IWL_MVM_OFFCHANNEL_QUEUE, 507 IWL_MVM_TX_FIFO_VO, 0, 508 wdg_timeout); 509 break; 510 case NL80211_IFTYPE_AP: 511 iwl_mvm_enable_ac_txq(mvm, vif->cab_queue, vif->cab_queue, 512 IWL_MVM_TX_FIFO_MCAST, 0, wdg_timeout); 513 /* fall through */ 514 default: 515 /* If DQA is supported - queues will be enabled when needed */ 516 if (iwl_mvm_is_dqa_supported(mvm)) 517 break; 518 519 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) 520 iwl_mvm_enable_ac_txq(mvm, vif->hw_queue[ac], 521 vif->hw_queue[ac], 522 iwl_mvm_ac_to_tx_fifo[ac], 0, 523 wdg_timeout); 524 break; 525 } 526 527 return 0; 528 } 529 530 void iwl_mvm_mac_ctxt_release(struct iwl_mvm *mvm, struct ieee80211_vif *vif) 531 { 532 int ac; 533 534 lockdep_assert_held(&mvm->mutex); 535 536 switch (vif->type) { 537 case NL80211_IFTYPE_P2P_DEVICE: 538 if (!iwl_mvm_is_dqa_supported(mvm)) 539 iwl_mvm_disable_txq(mvm, IWL_MVM_OFFCHANNEL_QUEUE, 540 IWL_MVM_OFFCHANNEL_QUEUE, 541 IWL_MAX_TID_COUNT, 0); 542 else 543 iwl_mvm_disable_txq(mvm, 544 IWL_MVM_DQA_P2P_DEVICE_QUEUE, 545 vif->hw_queue[0], IWL_MAX_TID_COUNT, 546 0); 547 548 break; 549 case NL80211_IFTYPE_AP: 550 iwl_mvm_disable_txq(mvm, vif->cab_queue, vif->cab_queue, 551 IWL_MAX_TID_COUNT, 0); 552 553 if (iwl_mvm_is_dqa_supported(mvm)) 554 iwl_mvm_disable_txq(mvm, 555 IWL_MVM_DQA_AP_PROBE_RESP_QUEUE, 556 vif->hw_queue[0], IWL_MAX_TID_COUNT, 557 0); 558 /* fall through */ 559 default: 560 /* 561 * If DQA is supported - queues were already disabled, since in 562 * DQA-mode the queues are a property of the STA and not of the 563 * vif, and at this point the STA was already deleted 564 */ 565 if (iwl_mvm_is_dqa_supported(mvm)) 566 break; 567 568 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) 569 iwl_mvm_disable_txq(mvm, vif->hw_queue[ac], 570 vif->hw_queue[ac], 571 IWL_MAX_TID_COUNT, 0); 572 } 573 } 574 575 static void iwl_mvm_ack_rates(struct iwl_mvm *mvm, 576 struct ieee80211_vif *vif, 577 enum nl80211_band band, 578 u8 *cck_rates, u8 *ofdm_rates) 579 { 580 struct ieee80211_supported_band *sband; 581 unsigned long basic = vif->bss_conf.basic_rates; 582 int lowest_present_ofdm = 100; 583 int lowest_present_cck = 100; 584 u8 cck = 0; 585 u8 ofdm = 0; 586 int i; 587 588 sband = mvm->hw->wiphy->bands[band]; 589 590 for_each_set_bit(i, &basic, BITS_PER_LONG) { 591 int hw = sband->bitrates[i].hw_value; 592 if (hw >= IWL_FIRST_OFDM_RATE) { 593 ofdm |= BIT(hw - IWL_FIRST_OFDM_RATE); 594 if (lowest_present_ofdm > hw) 595 lowest_present_ofdm = hw; 596 } else { 597 BUILD_BUG_ON(IWL_FIRST_CCK_RATE != 0); 598 599 cck |= BIT(hw); 600 if (lowest_present_cck > hw) 601 lowest_present_cck = hw; 602 } 603 } 604 605 /* 606 * Now we've got the basic rates as bitmaps in the ofdm and cck 607 * variables. This isn't sufficient though, as there might not 608 * be all the right rates in the bitmap. E.g. if the only basic 609 * rates are 5.5 Mbps and 11 Mbps, we still need to add 1 Mbps 610 * and 6 Mbps because the 802.11-2007 standard says in 9.6: 611 * 612 * [...] a STA responding to a received frame shall transmit 613 * its Control Response frame [...] at the highest rate in the 614 * BSSBasicRateSet parameter that is less than or equal to the 615 * rate of the immediately previous frame in the frame exchange 616 * sequence ([...]) and that is of the same modulation class 617 * ([...]) as the received frame. If no rate contained in the 618 * BSSBasicRateSet parameter meets these conditions, then the 619 * control frame sent in response to a received frame shall be 620 * transmitted at the highest mandatory rate of the PHY that is 621 * less than or equal to the rate of the received frame, and 622 * that is of the same modulation class as the received frame. 623 * 624 * As a consequence, we need to add all mandatory rates that are 625 * lower than all of the basic rates to these bitmaps. 626 */ 627 628 if (IWL_RATE_24M_INDEX < lowest_present_ofdm) 629 ofdm |= IWL_RATE_BIT_MSK(24) >> IWL_FIRST_OFDM_RATE; 630 if (IWL_RATE_12M_INDEX < lowest_present_ofdm) 631 ofdm |= IWL_RATE_BIT_MSK(12) >> IWL_FIRST_OFDM_RATE; 632 /* 6M already there or needed so always add */ 633 ofdm |= IWL_RATE_BIT_MSK(6) >> IWL_FIRST_OFDM_RATE; 634 635 /* 636 * CCK is a bit more complex with DSSS vs. HR/DSSS vs. ERP. 637 * Note, however: 638 * - if no CCK rates are basic, it must be ERP since there must 639 * be some basic rates at all, so they're OFDM => ERP PHY 640 * (or we're in 5 GHz, and the cck bitmap will never be used) 641 * - if 11M is a basic rate, it must be ERP as well, so add 5.5M 642 * - if 5.5M is basic, 1M and 2M are mandatory 643 * - if 2M is basic, 1M is mandatory 644 * - if 1M is basic, that's the only valid ACK rate. 645 * As a consequence, it's not as complicated as it sounds, just add 646 * any lower rates to the ACK rate bitmap. 647 */ 648 if (IWL_RATE_11M_INDEX < lowest_present_cck) 649 cck |= IWL_RATE_BIT_MSK(11) >> IWL_FIRST_CCK_RATE; 650 if (IWL_RATE_5M_INDEX < lowest_present_cck) 651 cck |= IWL_RATE_BIT_MSK(5) >> IWL_FIRST_CCK_RATE; 652 if (IWL_RATE_2M_INDEX < lowest_present_cck) 653 cck |= IWL_RATE_BIT_MSK(2) >> IWL_FIRST_CCK_RATE; 654 /* 1M already there or needed so always add */ 655 cck |= IWL_RATE_BIT_MSK(1) >> IWL_FIRST_CCK_RATE; 656 657 *cck_rates = cck; 658 *ofdm_rates = ofdm; 659 } 660 661 static void iwl_mvm_mac_ctxt_set_ht_flags(struct iwl_mvm *mvm, 662 struct ieee80211_vif *vif, 663 struct iwl_mac_ctx_cmd *cmd) 664 { 665 /* for both sta and ap, ht_operation_mode hold the protection_mode */ 666 u8 protection_mode = vif->bss_conf.ht_operation_mode & 667 IEEE80211_HT_OP_MODE_PROTECTION; 668 /* The fw does not distinguish between ht and fat */ 669 u32 ht_flag = MAC_PROT_FLG_HT_PROT | MAC_PROT_FLG_FAT_PROT; 670 671 IWL_DEBUG_RATE(mvm, "protection mode set to %d\n", protection_mode); 672 /* 673 * See section 9.23.3.1 of IEEE 80211-2012. 674 * Nongreenfield HT STAs Present is not supported. 675 */ 676 switch (protection_mode) { 677 case IEEE80211_HT_OP_MODE_PROTECTION_NONE: 678 break; 679 case IEEE80211_HT_OP_MODE_PROTECTION_NONMEMBER: 680 case IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED: 681 cmd->protection_flags |= cpu_to_le32(ht_flag); 682 break; 683 case IEEE80211_HT_OP_MODE_PROTECTION_20MHZ: 684 /* Protect when channel wider than 20MHz */ 685 if (vif->bss_conf.chandef.width > NL80211_CHAN_WIDTH_20) 686 cmd->protection_flags |= cpu_to_le32(ht_flag); 687 break; 688 default: 689 IWL_ERR(mvm, "Illegal protection mode %d\n", 690 protection_mode); 691 break; 692 } 693 } 694 695 static void iwl_mvm_mac_ctxt_cmd_common(struct iwl_mvm *mvm, 696 struct ieee80211_vif *vif, 697 struct iwl_mac_ctx_cmd *cmd, 698 const u8 *bssid_override, 699 u32 action) 700 { 701 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif); 702 struct ieee80211_chanctx_conf *chanctx; 703 bool ht_enabled = !!(vif->bss_conf.ht_operation_mode & 704 IEEE80211_HT_OP_MODE_PROTECTION); 705 u8 cck_ack_rates, ofdm_ack_rates; 706 const u8 *bssid = bssid_override ?: vif->bss_conf.bssid; 707 int i; 708 709 cmd->id_and_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, 710 mvmvif->color)); 711 cmd->action = cpu_to_le32(action); 712 713 switch (vif->type) { 714 case NL80211_IFTYPE_STATION: 715 if (vif->p2p) 716 cmd->mac_type = cpu_to_le32(FW_MAC_TYPE_P2P_STA); 717 else 718 cmd->mac_type = cpu_to_le32(FW_MAC_TYPE_BSS_STA); 719 break; 720 case NL80211_IFTYPE_AP: 721 cmd->mac_type = cpu_to_le32(FW_MAC_TYPE_GO); 722 break; 723 case NL80211_IFTYPE_MONITOR: 724 cmd->mac_type = cpu_to_le32(FW_MAC_TYPE_LISTENER); 725 break; 726 case NL80211_IFTYPE_P2P_DEVICE: 727 cmd->mac_type = cpu_to_le32(FW_MAC_TYPE_P2P_DEVICE); 728 break; 729 case NL80211_IFTYPE_ADHOC: 730 cmd->mac_type = cpu_to_le32(FW_MAC_TYPE_IBSS); 731 break; 732 default: 733 WARN_ON_ONCE(1); 734 } 735 736 cmd->tsf_id = cpu_to_le32(mvmvif->tsf_id); 737 738 memcpy(cmd->node_addr, vif->addr, ETH_ALEN); 739 740 if (bssid) 741 memcpy(cmd->bssid_addr, bssid, ETH_ALEN); 742 else 743 eth_broadcast_addr(cmd->bssid_addr); 744 745 rcu_read_lock(); 746 chanctx = rcu_dereference(vif->chanctx_conf); 747 iwl_mvm_ack_rates(mvm, vif, chanctx ? chanctx->def.chan->band 748 : NL80211_BAND_2GHZ, 749 &cck_ack_rates, &ofdm_ack_rates); 750 rcu_read_unlock(); 751 752 cmd->cck_rates = cpu_to_le32((u32)cck_ack_rates); 753 cmd->ofdm_rates = cpu_to_le32((u32)ofdm_ack_rates); 754 755 cmd->cck_short_preamble = 756 cpu_to_le32(vif->bss_conf.use_short_preamble ? 757 MAC_FLG_SHORT_PREAMBLE : 0); 758 cmd->short_slot = 759 cpu_to_le32(vif->bss_conf.use_short_slot ? 760 MAC_FLG_SHORT_SLOT : 0); 761 762 cmd->filter_flags = cpu_to_le32(MAC_FILTER_ACCEPT_GRP); 763 764 for (i = 0; i < IEEE80211_NUM_ACS; i++) { 765 u8 txf = iwl_mvm_ac_to_tx_fifo[i]; 766 767 cmd->ac[txf].cw_min = 768 cpu_to_le16(mvmvif->queue_params[i].cw_min); 769 cmd->ac[txf].cw_max = 770 cpu_to_le16(mvmvif->queue_params[i].cw_max); 771 cmd->ac[txf].edca_txop = 772 cpu_to_le16(mvmvif->queue_params[i].txop * 32); 773 cmd->ac[txf].aifsn = mvmvif->queue_params[i].aifs; 774 cmd->ac[txf].fifos_mask = BIT(txf); 775 } 776 777 if (vif->bss_conf.qos) 778 cmd->qos_flags |= cpu_to_le32(MAC_QOS_FLG_UPDATE_EDCA); 779 780 if (vif->bss_conf.use_cts_prot) 781 cmd->protection_flags |= cpu_to_le32(MAC_PROT_FLG_TGG_PROTECT); 782 783 IWL_DEBUG_RATE(mvm, "use_cts_prot %d, ht_operation_mode %d\n", 784 vif->bss_conf.use_cts_prot, 785 vif->bss_conf.ht_operation_mode); 786 if (vif->bss_conf.chandef.width != NL80211_CHAN_WIDTH_20_NOHT) 787 cmd->qos_flags |= cpu_to_le32(MAC_QOS_FLG_TGN); 788 if (ht_enabled) 789 iwl_mvm_mac_ctxt_set_ht_flags(mvm, vif, cmd); 790 } 791 792 static int iwl_mvm_mac_ctxt_send_cmd(struct iwl_mvm *mvm, 793 struct iwl_mac_ctx_cmd *cmd) 794 { 795 int ret = iwl_mvm_send_cmd_pdu(mvm, MAC_CONTEXT_CMD, 0, 796 sizeof(*cmd), cmd); 797 if (ret) 798 IWL_ERR(mvm, "Failed to send MAC context (action:%d): %d\n", 799 le32_to_cpu(cmd->action), ret); 800 return ret; 801 } 802 803 static int iwl_mvm_mac_ctxt_cmd_sta(struct iwl_mvm *mvm, 804 struct ieee80211_vif *vif, 805 u32 action, bool force_assoc_off, 806 const u8 *bssid_override) 807 { 808 struct iwl_mac_ctx_cmd cmd = {}; 809 struct iwl_mac_data_sta *ctxt_sta; 810 811 WARN_ON(vif->type != NL80211_IFTYPE_STATION); 812 813 /* Fill the common data for all mac context types */ 814 iwl_mvm_mac_ctxt_cmd_common(mvm, vif, &cmd, bssid_override, action); 815 816 if (vif->p2p) { 817 struct ieee80211_p2p_noa_attr *noa = 818 &vif->bss_conf.p2p_noa_attr; 819 820 cmd.p2p_sta.ctwin = cpu_to_le32(noa->oppps_ctwindow & 821 IEEE80211_P2P_OPPPS_CTWINDOW_MASK); 822 ctxt_sta = &cmd.p2p_sta.sta; 823 } else { 824 ctxt_sta = &cmd.sta; 825 } 826 827 /* We need the dtim_period to set the MAC as associated */ 828 if (vif->bss_conf.assoc && vif->bss_conf.dtim_period && 829 !force_assoc_off) { 830 u32 dtim_offs; 831 832 /* 833 * The DTIM count counts down, so when it is N that means N 834 * more beacon intervals happen until the DTIM TBTT. Therefore 835 * add this to the current time. If that ends up being in the 836 * future, the firmware will handle it. 837 * 838 * Also note that the system_timestamp (which we get here as 839 * "sync_device_ts") and TSF timestamp aren't at exactly the 840 * same offset in the frame -- the TSF is at the first symbol 841 * of the TSF, the system timestamp is at signal acquisition 842 * time. This means there's an offset between them of at most 843 * a few hundred microseconds (24 * 8 bits + PLCP time gives 844 * 384us in the longest case), this is currently not relevant 845 * as the firmware wakes up around 2ms before the TBTT. 846 */ 847 dtim_offs = vif->bss_conf.sync_dtim_count * 848 vif->bss_conf.beacon_int; 849 /* convert TU to usecs */ 850 dtim_offs *= 1024; 851 852 ctxt_sta->dtim_tsf = 853 cpu_to_le64(vif->bss_conf.sync_tsf + dtim_offs); 854 ctxt_sta->dtim_time = 855 cpu_to_le32(vif->bss_conf.sync_device_ts + dtim_offs); 856 857 IWL_DEBUG_INFO(mvm, "DTIM TBTT is 0x%llx/0x%x, offset %d\n", 858 le64_to_cpu(ctxt_sta->dtim_tsf), 859 le32_to_cpu(ctxt_sta->dtim_time), 860 dtim_offs); 861 862 ctxt_sta->is_assoc = cpu_to_le32(1); 863 } else { 864 ctxt_sta->is_assoc = cpu_to_le32(0); 865 866 /* Allow beacons to pass through as long as we are not 867 * associated, or we do not have dtim period information. 868 */ 869 cmd.filter_flags |= cpu_to_le32(MAC_FILTER_IN_BEACON); 870 } 871 872 ctxt_sta->bi = cpu_to_le32(vif->bss_conf.beacon_int); 873 ctxt_sta->bi_reciprocal = 874 cpu_to_le32(iwl_mvm_reciprocal(vif->bss_conf.beacon_int)); 875 ctxt_sta->dtim_interval = cpu_to_le32(vif->bss_conf.beacon_int * 876 vif->bss_conf.dtim_period); 877 ctxt_sta->dtim_reciprocal = 878 cpu_to_le32(iwl_mvm_reciprocal(vif->bss_conf.beacon_int * 879 vif->bss_conf.dtim_period)); 880 881 ctxt_sta->listen_interval = cpu_to_le32(mvm->hw->conf.listen_interval); 882 ctxt_sta->assoc_id = cpu_to_le32(vif->bss_conf.aid); 883 884 if (vif->probe_req_reg && vif->bss_conf.assoc && vif->p2p) 885 cmd.filter_flags |= cpu_to_le32(MAC_FILTER_IN_PROBE_REQUEST); 886 887 return iwl_mvm_mac_ctxt_send_cmd(mvm, &cmd); 888 } 889 890 static int iwl_mvm_mac_ctxt_cmd_listener(struct iwl_mvm *mvm, 891 struct ieee80211_vif *vif, 892 u32 action) 893 { 894 struct iwl_mac_ctx_cmd cmd = {}; 895 u32 tfd_queue_msk = 0; 896 int ret, i; 897 898 WARN_ON(vif->type != NL80211_IFTYPE_MONITOR); 899 900 iwl_mvm_mac_ctxt_cmd_common(mvm, vif, &cmd, NULL, action); 901 902 for (i = 0; i < IEEE80211_NUM_ACS; i++) 903 if (vif->hw_queue[i] != IEEE80211_INVAL_HW_QUEUE) 904 tfd_queue_msk |= BIT(vif->hw_queue[i]); 905 906 cmd.filter_flags = cpu_to_le32(MAC_FILTER_IN_PROMISC | 907 MAC_FILTER_IN_CONTROL_AND_MGMT | 908 MAC_FILTER_IN_BEACON | 909 MAC_FILTER_IN_PROBE_REQUEST | 910 MAC_FILTER_IN_CRC32); 911 ieee80211_hw_set(mvm->hw, RX_INCLUDES_FCS); 912 913 /* Allocate sniffer station */ 914 ret = iwl_mvm_allocate_int_sta(mvm, &mvm->snif_sta, tfd_queue_msk, 915 vif->type); 916 if (ret) 917 return ret; 918 919 return iwl_mvm_mac_ctxt_send_cmd(mvm, &cmd); 920 } 921 922 static int iwl_mvm_mac_ctxt_cmd_ibss(struct iwl_mvm *mvm, 923 struct ieee80211_vif *vif, 924 u32 action) 925 { 926 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif); 927 struct iwl_mac_ctx_cmd cmd = {}; 928 929 WARN_ON(vif->type != NL80211_IFTYPE_ADHOC); 930 931 iwl_mvm_mac_ctxt_cmd_common(mvm, vif, &cmd, NULL, action); 932 933 cmd.filter_flags = cpu_to_le32(MAC_FILTER_IN_BEACON | 934 MAC_FILTER_IN_PROBE_REQUEST); 935 936 /* cmd.ibss.beacon_time/cmd.ibss.beacon_tsf are curently ignored */ 937 cmd.ibss.bi = cpu_to_le32(vif->bss_conf.beacon_int); 938 cmd.ibss.bi_reciprocal = 939 cpu_to_le32(iwl_mvm_reciprocal(vif->bss_conf.beacon_int)); 940 941 /* TODO: Assumes that the beacon id == mac context id */ 942 cmd.ibss.beacon_template = cpu_to_le32(mvmvif->id); 943 944 return iwl_mvm_mac_ctxt_send_cmd(mvm, &cmd); 945 } 946 947 struct iwl_mvm_go_iterator_data { 948 bool go_active; 949 }; 950 951 static void iwl_mvm_go_iterator(void *_data, u8 *mac, struct ieee80211_vif *vif) 952 { 953 struct iwl_mvm_go_iterator_data *data = _data; 954 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif); 955 956 if (vif->type == NL80211_IFTYPE_AP && vif->p2p && 957 mvmvif->ap_ibss_active) 958 data->go_active = true; 959 } 960 961 static int iwl_mvm_mac_ctxt_cmd_p2p_device(struct iwl_mvm *mvm, 962 struct ieee80211_vif *vif, 963 u32 action) 964 { 965 struct iwl_mac_ctx_cmd cmd = {}; 966 struct iwl_mvm_go_iterator_data data = {}; 967 968 WARN_ON(vif->type != NL80211_IFTYPE_P2P_DEVICE); 969 970 iwl_mvm_mac_ctxt_cmd_common(mvm, vif, &cmd, NULL, action); 971 972 cmd.protection_flags |= cpu_to_le32(MAC_PROT_FLG_TGG_PROTECT); 973 974 /* Override the filter flags to accept only probe requests */ 975 cmd.filter_flags = cpu_to_le32(MAC_FILTER_IN_PROBE_REQUEST); 976 977 /* 978 * This flag should be set to true when the P2P Device is 979 * discoverable and there is at least another active P2P GO. Settings 980 * this flag will allow the P2P Device to be discoverable on other 981 * channels in addition to its listen channel. 982 * Note that this flag should not be set in other cases as it opens the 983 * Rx filters on all MAC and increases the number of interrupts. 984 */ 985 ieee80211_iterate_active_interfaces_atomic( 986 mvm->hw, IEEE80211_IFACE_ITER_RESUME_ALL, 987 iwl_mvm_go_iterator, &data); 988 989 cmd.p2p_dev.is_disc_extended = cpu_to_le32(data.go_active ? 1 : 0); 990 return iwl_mvm_mac_ctxt_send_cmd(mvm, &cmd); 991 } 992 993 static void iwl_mvm_mac_ctxt_set_tim(struct iwl_mvm *mvm, 994 struct iwl_mac_beacon_cmd_v6 *beacon_cmd, 995 u8 *beacon, u32 frame_size) 996 { 997 u32 tim_idx; 998 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)beacon; 999 1000 /* The index is relative to frame start but we start looking at the 1001 * variable-length part of the beacon. */ 1002 tim_idx = mgmt->u.beacon.variable - beacon; 1003 1004 /* Parse variable-length elements of beacon to find WLAN_EID_TIM */ 1005 while ((tim_idx < (frame_size - 2)) && 1006 (beacon[tim_idx] != WLAN_EID_TIM)) 1007 tim_idx += beacon[tim_idx+1] + 2; 1008 1009 /* If TIM field was found, set variables */ 1010 if ((tim_idx < (frame_size - 1)) && (beacon[tim_idx] == WLAN_EID_TIM)) { 1011 beacon_cmd->tim_idx = cpu_to_le32(tim_idx); 1012 beacon_cmd->tim_size = cpu_to_le32((u32)beacon[tim_idx+1]); 1013 } else { 1014 IWL_WARN(mvm, "Unable to find TIM Element in beacon\n"); 1015 } 1016 } 1017 1018 static u32 iwl_mvm_find_ie_offset(u8 *beacon, u8 eid, u32 frame_size) 1019 { 1020 struct ieee80211_mgmt *mgmt = (void *)beacon; 1021 const u8 *ie; 1022 1023 if (WARN_ON_ONCE(frame_size <= (mgmt->u.beacon.variable - beacon))) 1024 return 0; 1025 1026 frame_size -= mgmt->u.beacon.variable - beacon; 1027 1028 ie = cfg80211_find_ie(eid, mgmt->u.beacon.variable, frame_size); 1029 if (!ie) 1030 return 0; 1031 1032 return ie - beacon; 1033 } 1034 1035 static int iwl_mvm_mac_ctxt_send_beacon(struct iwl_mvm *mvm, 1036 struct ieee80211_vif *vif, 1037 struct sk_buff *beacon) 1038 { 1039 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif); 1040 struct iwl_host_cmd cmd = { 1041 .id = BEACON_TEMPLATE_CMD, 1042 .flags = CMD_ASYNC, 1043 }; 1044 union { 1045 struct iwl_mac_beacon_cmd_v6 beacon_cmd_v6; 1046 struct iwl_mac_beacon_cmd beacon_cmd; 1047 } u = {}; 1048 struct ieee80211_tx_info *info; 1049 u32 beacon_skb_len; 1050 u32 rate, tx_flags; 1051 1052 if (WARN_ON(!beacon)) 1053 return -EINVAL; 1054 1055 beacon_skb_len = beacon->len; 1056 1057 /* TODO: for now the beacon template id is set to be the mac context id. 1058 * Might be better to handle it as another resource ... */ 1059 u.beacon_cmd_v6.template_id = cpu_to_le32((u32)mvmvif->id); 1060 info = IEEE80211_SKB_CB(beacon); 1061 1062 /* Set up TX command fields */ 1063 u.beacon_cmd_v6.tx.len = cpu_to_le16((u16)beacon_skb_len); 1064 u.beacon_cmd_v6.tx.sta_id = mvmvif->bcast_sta.sta_id; 1065 u.beacon_cmd_v6.tx.life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE); 1066 tx_flags = TX_CMD_FLG_SEQ_CTL | TX_CMD_FLG_TSF; 1067 tx_flags |= 1068 iwl_mvm_bt_coex_tx_prio(mvm, (void *)beacon->data, info, 0) << 1069 TX_CMD_FLG_BT_PRIO_POS; 1070 u.beacon_cmd_v6.tx.tx_flags = cpu_to_le32(tx_flags); 1071 1072 if (!fw_has_capa(&mvm->fw->ucode_capa, 1073 IWL_UCODE_TLV_CAPA_BEACON_ANT_SELECTION)) { 1074 mvm->mgmt_last_antenna_idx = 1075 iwl_mvm_next_antenna(mvm, iwl_mvm_get_valid_tx_ant(mvm), 1076 mvm->mgmt_last_antenna_idx); 1077 } 1078 1079 u.beacon_cmd_v6.tx.rate_n_flags = 1080 cpu_to_le32(BIT(mvm->mgmt_last_antenna_idx) << 1081 RATE_MCS_ANT_POS); 1082 1083 if (info->band == NL80211_BAND_5GHZ || vif->p2p) { 1084 rate = IWL_FIRST_OFDM_RATE; 1085 } else { 1086 rate = IWL_FIRST_CCK_RATE; 1087 u.beacon_cmd_v6.tx.rate_n_flags |= 1088 cpu_to_le32(RATE_MCS_CCK_MSK); 1089 } 1090 u.beacon_cmd_v6.tx.rate_n_flags |= 1091 cpu_to_le32(iwl_mvm_mac80211_idx_to_hwrate(rate)); 1092 1093 /* Set up TX beacon command fields */ 1094 if (vif->type == NL80211_IFTYPE_AP) 1095 iwl_mvm_mac_ctxt_set_tim(mvm, &u.beacon_cmd_v6, 1096 beacon->data, 1097 beacon_skb_len); 1098 1099 /* Submit command */ 1100 1101 if (fw_has_capa(&mvm->fw->ucode_capa, 1102 IWL_UCODE_TLV_CAPA_CSA_AND_TBTT_OFFLOAD)) { 1103 u.beacon_cmd.csa_offset = 1104 cpu_to_le32(iwl_mvm_find_ie_offset(beacon->data, 1105 WLAN_EID_CHANNEL_SWITCH, 1106 beacon_skb_len)); 1107 u.beacon_cmd.ecsa_offset = 1108 cpu_to_le32(iwl_mvm_find_ie_offset(beacon->data, 1109 WLAN_EID_EXT_CHANSWITCH_ANN, 1110 beacon_skb_len)); 1111 1112 cmd.len[0] = sizeof(u.beacon_cmd); 1113 } else { 1114 cmd.len[0] = sizeof(u.beacon_cmd_v6); 1115 } 1116 1117 cmd.data[0] = &u; 1118 cmd.dataflags[0] = 0; 1119 cmd.len[1] = beacon_skb_len; 1120 cmd.data[1] = beacon->data; 1121 cmd.dataflags[1] = IWL_HCMD_DFL_DUP; 1122 1123 return iwl_mvm_send_cmd(mvm, &cmd); 1124 } 1125 1126 /* The beacon template for the AP/GO/IBSS has changed and needs update */ 1127 int iwl_mvm_mac_ctxt_beacon_changed(struct iwl_mvm *mvm, 1128 struct ieee80211_vif *vif) 1129 { 1130 struct sk_buff *beacon; 1131 int ret; 1132 1133 WARN_ON(vif->type != NL80211_IFTYPE_AP && 1134 vif->type != NL80211_IFTYPE_ADHOC); 1135 1136 beacon = ieee80211_beacon_get_template(mvm->hw, vif, NULL); 1137 if (!beacon) 1138 return -ENOMEM; 1139 1140 ret = iwl_mvm_mac_ctxt_send_beacon(mvm, vif, beacon); 1141 dev_kfree_skb(beacon); 1142 return ret; 1143 } 1144 1145 struct iwl_mvm_mac_ap_iterator_data { 1146 struct iwl_mvm *mvm; 1147 struct ieee80211_vif *vif; 1148 u32 beacon_device_ts; 1149 u16 beacon_int; 1150 }; 1151 1152 /* Find the beacon_device_ts and beacon_int for a managed interface */ 1153 static void iwl_mvm_mac_ap_iterator(void *_data, u8 *mac, 1154 struct ieee80211_vif *vif) 1155 { 1156 struct iwl_mvm_mac_ap_iterator_data *data = _data; 1157 1158 if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) 1159 return; 1160 1161 /* Station client has higher priority over P2P client*/ 1162 if (vif->p2p && data->beacon_device_ts) 1163 return; 1164 1165 data->beacon_device_ts = vif->bss_conf.sync_device_ts; 1166 data->beacon_int = vif->bss_conf.beacon_int; 1167 } 1168 1169 /* 1170 * Fill the specific data for mac context of type AP of P2P GO 1171 */ 1172 static void iwl_mvm_mac_ctxt_cmd_fill_ap(struct iwl_mvm *mvm, 1173 struct ieee80211_vif *vif, 1174 struct iwl_mac_ctx_cmd *cmd, 1175 struct iwl_mac_data_ap *ctxt_ap, 1176 bool add) 1177 { 1178 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif); 1179 struct iwl_mvm_mac_ap_iterator_data data = { 1180 .mvm = mvm, 1181 .vif = vif, 1182 .beacon_device_ts = 0 1183 }; 1184 1185 /* in AP mode, the MCAST FIFO takes the EDCA params from VO */ 1186 cmd->ac[IWL_MVM_TX_FIFO_VO].fifos_mask |= BIT(IWL_MVM_TX_FIFO_MCAST); 1187 1188 /* 1189 * in AP mode, pass probe requests and beacons from other APs 1190 * (needed for ht protection); when there're no any associated 1191 * station don't ask FW to pass beacons to prevent unnecessary 1192 * wake-ups. 1193 */ 1194 cmd->filter_flags |= cpu_to_le32(MAC_FILTER_IN_PROBE_REQUEST); 1195 if (mvmvif->ap_assoc_sta_count || !mvm->drop_bcn_ap_mode) { 1196 cmd->filter_flags |= cpu_to_le32(MAC_FILTER_IN_BEACON); 1197 IWL_DEBUG_HC(mvm, "Asking FW to pass beacons\n"); 1198 } else { 1199 IWL_DEBUG_HC(mvm, "No need to receive beacons\n"); 1200 } 1201 1202 ctxt_ap->bi = cpu_to_le32(vif->bss_conf.beacon_int); 1203 ctxt_ap->bi_reciprocal = 1204 cpu_to_le32(iwl_mvm_reciprocal(vif->bss_conf.beacon_int)); 1205 ctxt_ap->dtim_interval = cpu_to_le32(vif->bss_conf.beacon_int * 1206 vif->bss_conf.dtim_period); 1207 ctxt_ap->dtim_reciprocal = 1208 cpu_to_le32(iwl_mvm_reciprocal(vif->bss_conf.beacon_int * 1209 vif->bss_conf.dtim_period)); 1210 1211 ctxt_ap->mcast_qid = cpu_to_le32(vif->cab_queue); 1212 1213 /* 1214 * Only set the beacon time when the MAC is being added, when we 1215 * just modify the MAC then we should keep the time -- the firmware 1216 * can otherwise have a "jumping" TBTT. 1217 */ 1218 if (add) { 1219 /* 1220 * If there is a station/P2P client interface which is 1221 * associated, set the AP's TBTT far enough from the station's 1222 * TBTT. Otherwise, set it to the current system time 1223 */ 1224 ieee80211_iterate_active_interfaces_atomic( 1225 mvm->hw, IEEE80211_IFACE_ITER_RESUME_ALL, 1226 iwl_mvm_mac_ap_iterator, &data); 1227 1228 if (data.beacon_device_ts) { 1229 u32 rand = (prandom_u32() % (64 - 36)) + 36; 1230 mvmvif->ap_beacon_time = data.beacon_device_ts + 1231 ieee80211_tu_to_usec(data.beacon_int * rand / 1232 100); 1233 } else { 1234 mvmvif->ap_beacon_time = 1235 iwl_read_prph(mvm->trans, 1236 DEVICE_SYSTEM_TIME_REG); 1237 } 1238 } 1239 1240 ctxt_ap->beacon_time = cpu_to_le32(mvmvif->ap_beacon_time); 1241 ctxt_ap->beacon_tsf = 0; /* unused */ 1242 1243 /* TODO: Assume that the beacon id == mac context id */ 1244 ctxt_ap->beacon_template = cpu_to_le32(mvmvif->id); 1245 } 1246 1247 static int iwl_mvm_mac_ctxt_cmd_ap(struct iwl_mvm *mvm, 1248 struct ieee80211_vif *vif, 1249 u32 action) 1250 { 1251 struct iwl_mac_ctx_cmd cmd = {}; 1252 1253 WARN_ON(vif->type != NL80211_IFTYPE_AP || vif->p2p); 1254 1255 /* Fill the common data for all mac context types */ 1256 iwl_mvm_mac_ctxt_cmd_common(mvm, vif, &cmd, NULL, action); 1257 1258 /* Fill the data specific for ap mode */ 1259 iwl_mvm_mac_ctxt_cmd_fill_ap(mvm, vif, &cmd, &cmd.ap, 1260 action == FW_CTXT_ACTION_ADD); 1261 1262 return iwl_mvm_mac_ctxt_send_cmd(mvm, &cmd); 1263 } 1264 1265 static int iwl_mvm_mac_ctxt_cmd_go(struct iwl_mvm *mvm, 1266 struct ieee80211_vif *vif, 1267 u32 action) 1268 { 1269 struct iwl_mac_ctx_cmd cmd = {}; 1270 struct ieee80211_p2p_noa_attr *noa = &vif->bss_conf.p2p_noa_attr; 1271 1272 WARN_ON(vif->type != NL80211_IFTYPE_AP || !vif->p2p); 1273 1274 /* Fill the common data for all mac context types */ 1275 iwl_mvm_mac_ctxt_cmd_common(mvm, vif, &cmd, NULL, action); 1276 1277 /* Fill the data specific for GO mode */ 1278 iwl_mvm_mac_ctxt_cmd_fill_ap(mvm, vif, &cmd, &cmd.go.ap, 1279 action == FW_CTXT_ACTION_ADD); 1280 1281 cmd.go.ctwin = cpu_to_le32(noa->oppps_ctwindow & 1282 IEEE80211_P2P_OPPPS_CTWINDOW_MASK); 1283 cmd.go.opp_ps_enabled = 1284 cpu_to_le32(!!(noa->oppps_ctwindow & 1285 IEEE80211_P2P_OPPPS_ENABLE_BIT)); 1286 1287 return iwl_mvm_mac_ctxt_send_cmd(mvm, &cmd); 1288 } 1289 1290 static int iwl_mvm_mac_ctx_send(struct iwl_mvm *mvm, struct ieee80211_vif *vif, 1291 u32 action, bool force_assoc_off, 1292 const u8 *bssid_override) 1293 { 1294 switch (vif->type) { 1295 case NL80211_IFTYPE_STATION: 1296 return iwl_mvm_mac_ctxt_cmd_sta(mvm, vif, action, 1297 force_assoc_off, 1298 bssid_override); 1299 break; 1300 case NL80211_IFTYPE_AP: 1301 if (!vif->p2p) 1302 return iwl_mvm_mac_ctxt_cmd_ap(mvm, vif, action); 1303 else 1304 return iwl_mvm_mac_ctxt_cmd_go(mvm, vif, action); 1305 break; 1306 case NL80211_IFTYPE_MONITOR: 1307 return iwl_mvm_mac_ctxt_cmd_listener(mvm, vif, action); 1308 case NL80211_IFTYPE_P2P_DEVICE: 1309 return iwl_mvm_mac_ctxt_cmd_p2p_device(mvm, vif, action); 1310 case NL80211_IFTYPE_ADHOC: 1311 return iwl_mvm_mac_ctxt_cmd_ibss(mvm, vif, action); 1312 default: 1313 break; 1314 } 1315 1316 return -EOPNOTSUPP; 1317 } 1318 1319 int iwl_mvm_mac_ctxt_add(struct iwl_mvm *mvm, struct ieee80211_vif *vif) 1320 { 1321 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif); 1322 int ret; 1323 1324 if (WARN_ONCE(mvmvif->uploaded, "Adding active MAC %pM/%d\n", 1325 vif->addr, ieee80211_vif_type_p2p(vif))) 1326 return -EIO; 1327 1328 ret = iwl_mvm_mac_ctx_send(mvm, vif, FW_CTXT_ACTION_ADD, 1329 true, NULL); 1330 if (ret) 1331 return ret; 1332 1333 /* will only do anything at resume from D3 time */ 1334 iwl_mvm_set_last_nonqos_seq(mvm, vif); 1335 1336 mvmvif->uploaded = true; 1337 return 0; 1338 } 1339 1340 int iwl_mvm_mac_ctxt_changed(struct iwl_mvm *mvm, struct ieee80211_vif *vif, 1341 bool force_assoc_off, const u8 *bssid_override) 1342 { 1343 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif); 1344 1345 if (WARN_ONCE(!mvmvif->uploaded, "Changing inactive MAC %pM/%d\n", 1346 vif->addr, ieee80211_vif_type_p2p(vif))) 1347 return -EIO; 1348 1349 return iwl_mvm_mac_ctx_send(mvm, vif, FW_CTXT_ACTION_MODIFY, 1350 force_assoc_off, bssid_override); 1351 } 1352 1353 int iwl_mvm_mac_ctxt_remove(struct iwl_mvm *mvm, struct ieee80211_vif *vif) 1354 { 1355 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif); 1356 struct iwl_mac_ctx_cmd cmd; 1357 int ret; 1358 1359 if (WARN_ONCE(!mvmvif->uploaded, "Removing inactive MAC %pM/%d\n", 1360 vif->addr, ieee80211_vif_type_p2p(vif))) 1361 return -EIO; 1362 1363 memset(&cmd, 0, sizeof(cmd)); 1364 1365 cmd.id_and_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, 1366 mvmvif->color)); 1367 cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE); 1368 1369 ret = iwl_mvm_send_cmd_pdu(mvm, MAC_CONTEXT_CMD, 0, 1370 sizeof(cmd), &cmd); 1371 if (ret) { 1372 IWL_ERR(mvm, "Failed to remove MAC context: %d\n", ret); 1373 return ret; 1374 } 1375 1376 mvmvif->uploaded = false; 1377 1378 if (vif->type == NL80211_IFTYPE_MONITOR) { 1379 __clear_bit(IEEE80211_HW_RX_INCLUDES_FCS, mvm->hw->flags); 1380 iwl_mvm_dealloc_snif_sta(mvm); 1381 } 1382 1383 return 0; 1384 } 1385 1386 static void iwl_mvm_csa_count_down(struct iwl_mvm *mvm, 1387 struct ieee80211_vif *csa_vif, u32 gp2, 1388 bool tx_success) 1389 { 1390 struct iwl_mvm_vif *mvmvif = 1391 iwl_mvm_vif_from_mac80211(csa_vif); 1392 1393 /* Don't start to countdown from a failed beacon */ 1394 if (!tx_success && !mvmvif->csa_countdown) 1395 return; 1396 1397 mvmvif->csa_countdown = true; 1398 1399 if (!ieee80211_csa_is_complete(csa_vif)) { 1400 int c = ieee80211_csa_update_counter(csa_vif); 1401 1402 iwl_mvm_mac_ctxt_beacon_changed(mvm, csa_vif); 1403 if (csa_vif->p2p && 1404 !iwl_mvm_te_scheduled(&mvmvif->time_event_data) && gp2 && 1405 tx_success) { 1406 u32 rel_time = (c + 1) * 1407 csa_vif->bss_conf.beacon_int - 1408 IWL_MVM_CHANNEL_SWITCH_TIME_GO; 1409 u32 apply_time = gp2 + rel_time * 1024; 1410 1411 iwl_mvm_schedule_csa_period(mvm, csa_vif, 1412 IWL_MVM_CHANNEL_SWITCH_TIME_GO - 1413 IWL_MVM_CHANNEL_SWITCH_MARGIN, 1414 apply_time); 1415 } 1416 } else if (!iwl_mvm_te_scheduled(&mvmvif->time_event_data)) { 1417 /* we don't have CSA NoA scheduled yet, switch now */ 1418 ieee80211_csa_finish(csa_vif); 1419 RCU_INIT_POINTER(mvm->csa_vif, NULL); 1420 } 1421 } 1422 1423 void iwl_mvm_rx_beacon_notif(struct iwl_mvm *mvm, 1424 struct iwl_rx_cmd_buffer *rxb) 1425 { 1426 struct iwl_rx_packet *pkt = rxb_addr(rxb); 1427 struct iwl_extended_beacon_notif *beacon = (void *)pkt->data; 1428 struct iwl_mvm_tx_resp *beacon_notify_hdr; 1429 struct ieee80211_vif *csa_vif; 1430 struct ieee80211_vif *tx_blocked_vif; 1431 u16 status; 1432 1433 lockdep_assert_held(&mvm->mutex); 1434 1435 beacon_notify_hdr = &beacon->beacon_notify_hdr; 1436 mvm->ap_last_beacon_gp2 = le32_to_cpu(beacon->gp2); 1437 1438 status = le16_to_cpu(beacon_notify_hdr->status.status) & TX_STATUS_MSK; 1439 IWL_DEBUG_RX(mvm, 1440 "beacon status %#x retries:%d tsf:0x%16llX gp2:0x%X rate:%d\n", 1441 status, beacon_notify_hdr->failure_frame, 1442 le64_to_cpu(beacon->tsf), 1443 mvm->ap_last_beacon_gp2, 1444 le32_to_cpu(beacon_notify_hdr->initial_rate)); 1445 1446 csa_vif = rcu_dereference_protected(mvm->csa_vif, 1447 lockdep_is_held(&mvm->mutex)); 1448 if (unlikely(csa_vif && csa_vif->csa_active)) 1449 iwl_mvm_csa_count_down(mvm, csa_vif, mvm->ap_last_beacon_gp2, 1450 (status == TX_STATUS_SUCCESS)); 1451 1452 tx_blocked_vif = rcu_dereference_protected(mvm->csa_tx_blocked_vif, 1453 lockdep_is_held(&mvm->mutex)); 1454 if (unlikely(tx_blocked_vif)) { 1455 struct iwl_mvm_vif *mvmvif = 1456 iwl_mvm_vif_from_mac80211(tx_blocked_vif); 1457 1458 /* 1459 * The channel switch is started and we have blocked the 1460 * stations. If this is the first beacon (the timeout wasn't 1461 * set), set the unblock timeout, otherwise countdown 1462 */ 1463 if (!mvm->csa_tx_block_bcn_timeout) 1464 mvm->csa_tx_block_bcn_timeout = 1465 IWL_MVM_CS_UNBLOCK_TX_TIMEOUT; 1466 else 1467 mvm->csa_tx_block_bcn_timeout--; 1468 1469 /* Check if the timeout is expired, and unblock tx */ 1470 if (mvm->csa_tx_block_bcn_timeout == 0) { 1471 iwl_mvm_modify_all_sta_disable_tx(mvm, mvmvif, false); 1472 RCU_INIT_POINTER(mvm->csa_tx_blocked_vif, NULL); 1473 } 1474 } 1475 } 1476 1477 static void iwl_mvm_beacon_loss_iterator(void *_data, u8 *mac, 1478 struct ieee80211_vif *vif) 1479 { 1480 struct iwl_missed_beacons_notif *missed_beacons = _data; 1481 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif); 1482 struct iwl_mvm *mvm = mvmvif->mvm; 1483 struct iwl_fw_dbg_trigger_missed_bcon *bcon_trig; 1484 struct iwl_fw_dbg_trigger_tlv *trigger; 1485 u32 stop_trig_missed_bcon, stop_trig_missed_bcon_since_rx; 1486 u32 rx_missed_bcon, rx_missed_bcon_since_rx; 1487 1488 if (mvmvif->id != (u16)le32_to_cpu(missed_beacons->mac_id)) 1489 return; 1490 1491 rx_missed_bcon = le32_to_cpu(missed_beacons->consec_missed_beacons); 1492 rx_missed_bcon_since_rx = 1493 le32_to_cpu(missed_beacons->consec_missed_beacons_since_last_rx); 1494 /* 1495 * TODO: the threshold should be adjusted based on latency conditions, 1496 * and/or in case of a CS flow on one of the other AP vifs. 1497 */ 1498 if (le32_to_cpu(missed_beacons->consec_missed_beacons_since_last_rx) > 1499 IWL_MVM_MISSED_BEACONS_THRESHOLD) 1500 ieee80211_beacon_loss(vif); 1501 1502 if (!iwl_fw_dbg_trigger_enabled(mvm->fw, 1503 FW_DBG_TRIGGER_MISSED_BEACONS)) 1504 return; 1505 1506 trigger = iwl_fw_dbg_get_trigger(mvm->fw, 1507 FW_DBG_TRIGGER_MISSED_BEACONS); 1508 bcon_trig = (void *)trigger->data; 1509 stop_trig_missed_bcon = le32_to_cpu(bcon_trig->stop_consec_missed_bcon); 1510 stop_trig_missed_bcon_since_rx = 1511 le32_to_cpu(bcon_trig->stop_consec_missed_bcon_since_rx); 1512 1513 /* TODO: implement start trigger */ 1514 1515 if (!iwl_fw_dbg_trigger_check_stop(mvm, vif, trigger)) 1516 return; 1517 1518 if (rx_missed_bcon_since_rx >= stop_trig_missed_bcon_since_rx || 1519 rx_missed_bcon >= stop_trig_missed_bcon) 1520 iwl_mvm_fw_dbg_collect_trig(mvm, trigger, NULL); 1521 } 1522 1523 void iwl_mvm_rx_missed_beacons_notif(struct iwl_mvm *mvm, 1524 struct iwl_rx_cmd_buffer *rxb) 1525 { 1526 struct iwl_rx_packet *pkt = rxb_addr(rxb); 1527 struct iwl_missed_beacons_notif *mb = (void *)pkt->data; 1528 1529 IWL_DEBUG_INFO(mvm, 1530 "missed bcn mac_id=%u, consecutive=%u (%u, %u, %u)\n", 1531 le32_to_cpu(mb->mac_id), 1532 le32_to_cpu(mb->consec_missed_beacons), 1533 le32_to_cpu(mb->consec_missed_beacons_since_last_rx), 1534 le32_to_cpu(mb->num_recvd_beacons), 1535 le32_to_cpu(mb->num_expected_beacons)); 1536 1537 ieee80211_iterate_active_interfaces_atomic(mvm->hw, 1538 IEEE80211_IFACE_ITER_NORMAL, 1539 iwl_mvm_beacon_loss_iterator, 1540 mb); 1541 } 1542 1543 void iwl_mvm_rx_stored_beacon_notif(struct iwl_mvm *mvm, 1544 struct iwl_rx_cmd_buffer *rxb) 1545 { 1546 struct iwl_rx_packet *pkt = rxb_addr(rxb); 1547 struct iwl_stored_beacon_notif *sb = (void *)pkt->data; 1548 struct ieee80211_rx_status rx_status; 1549 struct sk_buff *skb; 1550 u32 size = le32_to_cpu(sb->byte_count); 1551 1552 if (size == 0) 1553 return; 1554 1555 skb = alloc_skb(size, GFP_ATOMIC); 1556 if (!skb) { 1557 IWL_ERR(mvm, "alloc_skb failed\n"); 1558 return; 1559 } 1560 1561 /* update rx_status according to the notification's metadata */ 1562 memset(&rx_status, 0, sizeof(rx_status)); 1563 rx_status.mactime = le64_to_cpu(sb->tsf); 1564 /* TSF as indicated by the firmware is at INA time */ 1565 rx_status.flag |= RX_FLAG_MACTIME_PLCP_START; 1566 rx_status.device_timestamp = le32_to_cpu(sb->system_time); 1567 rx_status.band = 1568 (sb->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_BAND_24)) ? 1569 NL80211_BAND_2GHZ : NL80211_BAND_5GHZ; 1570 rx_status.freq = 1571 ieee80211_channel_to_frequency(le16_to_cpu(sb->channel), 1572 rx_status.band); 1573 1574 /* copy the data */ 1575 memcpy(skb_put(skb, size), sb->data, size); 1576 memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status)); 1577 1578 /* pass it as regular rx to mac80211 */ 1579 ieee80211_rx_napi(mvm->hw, NULL, skb, NULL); 1580 } 1581 1582 void iwl_mvm_channel_switch_noa_notif(struct iwl_mvm *mvm, 1583 struct iwl_rx_cmd_buffer *rxb) 1584 { 1585 struct iwl_rx_packet *pkt = rxb_addr(rxb); 1586 struct iwl_channel_switch_noa_notif *notif = (void *)pkt->data; 1587 struct ieee80211_vif *csa_vif; 1588 struct iwl_mvm_vif *mvmvif; 1589 int len = iwl_rx_packet_payload_len(pkt); 1590 u32 id_n_color; 1591 1592 if (WARN_ON_ONCE(len < sizeof(*notif))) 1593 return; 1594 1595 rcu_read_lock(); 1596 1597 csa_vif = rcu_dereference(mvm->csa_vif); 1598 if (WARN_ON(!csa_vif || !csa_vif->csa_active)) 1599 goto out_unlock; 1600 1601 id_n_color = le32_to_cpu(notif->id_and_color); 1602 1603 mvmvif = iwl_mvm_vif_from_mac80211(csa_vif); 1604 if (WARN(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color) != id_n_color, 1605 "channel switch noa notification on unexpected vif (csa_vif=%d, notif=%d)", 1606 FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color), id_n_color)) 1607 goto out_unlock; 1608 1609 IWL_DEBUG_INFO(mvm, "Channel Switch Started Notification\n"); 1610 1611 queue_delayed_work(system_wq, &mvm->cs_tx_unblock_dwork, 1612 msecs_to_jiffies(IWL_MVM_CS_UNBLOCK_TX_TIMEOUT * 1613 csa_vif->bss_conf.beacon_int)); 1614 1615 ieee80211_csa_finish(csa_vif); 1616 1617 rcu_read_unlock(); 1618 1619 RCU_INIT_POINTER(mvm->csa_vif, NULL); 1620 1621 return; 1622 1623 out_unlock: 1624 rcu_read_unlock(); 1625 } 1626