1// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause 2/* 3 * Copyright (C) 2014 Intel Mobile Communications GmbH 4 * Copyright (C) 2017 Intel Deutschland GmbH 5 * Copyright (C) 2018-2020, 2022-2023 Intel Corporation 6 */ 7#include <linux/etherdevice.h> 8#include "mvm.h" 9#include "time-event.h" 10#include "iwl-io.h" 11#include "iwl-prph.h" 12 13#define TU_TO_US(x) (x * 1024) 14#define TU_TO_MS(x) (TU_TO_US(x) / 1000) 15 16void iwl_mvm_teardown_tdls_peers(struct iwl_mvm *mvm) 17{ 18 struct ieee80211_sta *sta; 19 struct iwl_mvm_sta *mvmsta; 20 int i; 21 22 lockdep_assert_held(&mvm->mutex); 23 24 for (i = 0; i < mvm->fw->ucode_capa.num_stations; i++) { 25 sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i], 26 lockdep_is_held(&mvm->mutex)); 27 if (!sta || IS_ERR(sta) || !sta->tdls) 28 continue; 29 30 mvmsta = iwl_mvm_sta_from_mac80211(sta); 31 ieee80211_tdls_oper_request(mvmsta->vif, sta->addr, 32 NL80211_TDLS_TEARDOWN, 33 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED, 34 GFP_KERNEL); 35 } 36} 37 38int iwl_mvm_tdls_sta_count(struct iwl_mvm *mvm, struct ieee80211_vif *vif) 39{ 40 struct ieee80211_sta *sta; 41 struct iwl_mvm_sta *mvmsta; 42 int count = 0; 43 int i; 44 45 lockdep_assert_held(&mvm->mutex); 46 47 for (i = 0; i < mvm->fw->ucode_capa.num_stations; i++) { 48 sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i], 49 lockdep_is_held(&mvm->mutex)); 50 if (!sta || IS_ERR(sta) || !sta->tdls) 51 continue; 52 53 if (vif) { 54 mvmsta = iwl_mvm_sta_from_mac80211(sta); 55 if (mvmsta->vif != vif) 56 continue; 57 } 58 59 count++; 60 } 61 62 return count; 63} 64 65static void iwl_mvm_tdls_config(struct iwl_mvm *mvm, struct ieee80211_vif *vif) 66{ 67 struct iwl_rx_packet *pkt; 68 struct iwl_tdls_config_res *resp; 69 struct iwl_tdls_config_cmd tdls_cfg_cmd = {}; 70 struct iwl_host_cmd cmd = { 71 .id = TDLS_CONFIG_CMD, 72 .flags = CMD_WANT_SKB, 73 .data = { &tdls_cfg_cmd, }, 74 .len = { sizeof(struct iwl_tdls_config_cmd), }, 75 }; 76 struct ieee80211_sta *sta; 77 int ret, i, cnt; 78 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif); 79 80 lockdep_assert_held(&mvm->mutex); 81 82 tdls_cfg_cmd.id_and_color = 83 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color)); 84 tdls_cfg_cmd.tx_to_ap_tid = IWL_MVM_TDLS_FW_TID; 85 tdls_cfg_cmd.tx_to_ap_ssn = cpu_to_le16(0); /* not used for now */ 86 87 /* for now the Tx cmd is empty and unused */ 88 89 /* populate TDLS peer data */ 90 cnt = 0; 91 for (i = 0; i < mvm->fw->ucode_capa.num_stations; i++) { 92 sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i], 93 lockdep_is_held(&mvm->mutex)); 94 if (IS_ERR_OR_NULL(sta) || !sta->tdls) 95 continue; 96 97 tdls_cfg_cmd.sta_info[cnt].sta_id = i; 98 tdls_cfg_cmd.sta_info[cnt].tx_to_peer_tid = 99 IWL_MVM_TDLS_FW_TID; 100 tdls_cfg_cmd.sta_info[cnt].tx_to_peer_ssn = cpu_to_le16(0); 101 tdls_cfg_cmd.sta_info[cnt].is_initiator = 102 cpu_to_le32(sta->tdls_initiator ? 1 : 0); 103 104 cnt++; 105 } 106 107 tdls_cfg_cmd.tdls_peer_count = cnt; 108 IWL_DEBUG_TDLS(mvm, "send TDLS config to FW for %d peers\n", cnt); 109 110 ret = iwl_mvm_send_cmd(mvm, &cmd); 111 if (WARN_ON_ONCE(ret)) 112 return; 113 114 pkt = cmd.resp_pkt; 115 116 WARN_ON_ONCE(iwl_rx_packet_payload_len(pkt) != sizeof(*resp)); 117 118 /* we don't really care about the response at this point */ 119 120 iwl_free_resp(&cmd); 121} 122 123void iwl_mvm_recalc_tdls_state(struct iwl_mvm *mvm, struct ieee80211_vif *vif, 124 bool sta_added) 125{ 126 int tdls_sta_cnt = iwl_mvm_tdls_sta_count(mvm, vif); 127 128 /* when the first peer joins, send a power update first */ 129 if (tdls_sta_cnt == 1 && sta_added) 130 iwl_mvm_power_update_mac(mvm); 131 132 /* Configure the FW with TDLS peer info only if TDLS channel switch 133 * capability is set. 134 * TDLS config data is used currently only in TDLS channel switch code. 135 * Supposed to serve also TDLS buffer station which is not implemneted 136 * yet in FW*/ 137 if (fw_has_capa(&mvm->fw->ucode_capa, 138 IWL_UCODE_TLV_CAPA_TDLS_CHANNEL_SWITCH)) 139 iwl_mvm_tdls_config(mvm, vif); 140 141 /* when the last peer leaves, send a power update last */ 142 if (tdls_sta_cnt == 0 && !sta_added) 143 iwl_mvm_power_update_mac(mvm); 144} 145 146void iwl_mvm_mac_mgd_protect_tdls_discover(struct ieee80211_hw *hw, 147 struct ieee80211_vif *vif, 148 unsigned int link_id) 149{ 150 struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw); 151 u32 duration = 2 * vif->bss_conf.dtim_period * vif->bss_conf.beacon_int; 152 153 /* Protect the session to hear the TDLS setup response on the channel */ 154 mutex_lock(&mvm->mutex); 155 if (fw_has_capa(&mvm->fw->ucode_capa, 156 IWL_UCODE_TLV_CAPA_SESSION_PROT_CMD)) 157 iwl_mvm_schedule_session_protection(mvm, vif, duration, 158 duration, true, link_id); 159 else 160 iwl_mvm_protect_session(mvm, vif, duration, 161 duration, 100, true); 162 mutex_unlock(&mvm->mutex); 163} 164 165static const char * 166iwl_mvm_tdls_cs_state_str(enum iwl_mvm_tdls_cs_state state) 167{ 168 switch (state) { 169 case IWL_MVM_TDLS_SW_IDLE: 170 return "IDLE"; 171 case IWL_MVM_TDLS_SW_REQ_SENT: 172 return "REQ SENT"; 173 case IWL_MVM_TDLS_SW_RESP_RCVD: 174 return "RESP RECEIVED"; 175 case IWL_MVM_TDLS_SW_REQ_RCVD: 176 return "REQ RECEIVED"; 177 case IWL_MVM_TDLS_SW_ACTIVE: 178 return "ACTIVE"; 179 } 180 181 return NULL; 182} 183 184static void iwl_mvm_tdls_update_cs_state(struct iwl_mvm *mvm, 185 enum iwl_mvm_tdls_cs_state state) 186{ 187 if (mvm->tdls_cs.state == state) 188 return; 189 190 IWL_DEBUG_TDLS(mvm, "TDLS channel switch state: %s -> %s\n", 191 iwl_mvm_tdls_cs_state_str(mvm->tdls_cs.state), 192 iwl_mvm_tdls_cs_state_str(state)); 193 mvm->tdls_cs.state = state; 194 195 /* we only send requests to our switching peer - update sent time */ 196 if (state == IWL_MVM_TDLS_SW_REQ_SENT) 197 mvm->tdls_cs.peer.sent_timestamp = iwl_mvm_get_systime(mvm); 198 199 if (state == IWL_MVM_TDLS_SW_IDLE) 200 mvm->tdls_cs.cur_sta_id = IWL_MVM_INVALID_STA; 201} 202 203void iwl_mvm_rx_tdls_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb) 204{ 205 struct iwl_rx_packet *pkt = rxb_addr(rxb); 206 struct iwl_tdls_channel_switch_notif *notif = (void *)pkt->data; 207 struct ieee80211_sta *sta; 208 unsigned int delay; 209 struct iwl_mvm_sta *mvmsta; 210 struct ieee80211_vif *vif; 211 u32 sta_id = le32_to_cpu(notif->sta_id); 212 213 lockdep_assert_held(&mvm->mutex); 214 215 /* can fail sometimes */ 216 if (!le32_to_cpu(notif->status)) { 217 iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_IDLE); 218 return; 219 } 220 221 if (WARN_ON(sta_id >= mvm->fw->ucode_capa.num_stations)) 222 return; 223 224 sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[sta_id], 225 lockdep_is_held(&mvm->mutex)); 226 /* the station may not be here, but if it is, it must be a TDLS peer */ 227 if (IS_ERR_OR_NULL(sta) || WARN_ON(!sta->tdls)) 228 return; 229 230 mvmsta = iwl_mvm_sta_from_mac80211(sta); 231 vif = mvmsta->vif; 232 233 /* 234 * Update state and possibly switch again after this is over (DTIM). 235 * Also convert TU to msec. 236 */ 237 delay = TU_TO_MS(vif->bss_conf.dtim_period * vif->bss_conf.beacon_int); 238 mod_delayed_work(system_wq, &mvm->tdls_cs.dwork, 239 msecs_to_jiffies(delay)); 240 241 iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_ACTIVE); 242} 243 244static int 245iwl_mvm_tdls_check_action(struct iwl_mvm *mvm, 246 enum iwl_tdls_channel_switch_type type, 247 const u8 *peer, bool peer_initiator, u32 timestamp) 248{ 249 bool same_peer = false; 250 int ret = 0; 251 252 /* get the existing peer if it's there */ 253 if (mvm->tdls_cs.state != IWL_MVM_TDLS_SW_IDLE && 254 mvm->tdls_cs.cur_sta_id != IWL_MVM_INVALID_STA) { 255 struct ieee80211_sta *sta = rcu_dereference_protected( 256 mvm->fw_id_to_mac_id[mvm->tdls_cs.cur_sta_id], 257 lockdep_is_held(&mvm->mutex)); 258 if (!IS_ERR_OR_NULL(sta)) 259 same_peer = ether_addr_equal(peer, sta->addr); 260 } 261 262 switch (mvm->tdls_cs.state) { 263 case IWL_MVM_TDLS_SW_IDLE: 264 /* 265 * might be spurious packet from the peer after the switch is 266 * already done 267 */ 268 if (type == TDLS_MOVE_CH) 269 ret = -EINVAL; 270 break; 271 case IWL_MVM_TDLS_SW_REQ_SENT: 272 /* only allow requests from the same peer */ 273 if (!same_peer) 274 ret = -EBUSY; 275 else if (type == TDLS_SEND_CHAN_SW_RESP_AND_MOVE_CH && 276 !peer_initiator) 277 /* 278 * We received a ch-switch request while an outgoing 279 * one is pending. Allow it if the peer is the link 280 * initiator. 281 */ 282 ret = -EBUSY; 283 else if (type == TDLS_SEND_CHAN_SW_REQ) 284 /* wait for idle before sending another request */ 285 ret = -EBUSY; 286 else if (timestamp <= mvm->tdls_cs.peer.sent_timestamp) 287 /* we got a stale response - ignore it */ 288 ret = -EINVAL; 289 break; 290 case IWL_MVM_TDLS_SW_RESP_RCVD: 291 /* 292 * we are waiting for the FW to give an "active" notification, 293 * so ignore requests in the meantime 294 */ 295 ret = -EBUSY; 296 break; 297 case IWL_MVM_TDLS_SW_REQ_RCVD: 298 /* as above, allow the link initiator to proceed */ 299 if (type == TDLS_SEND_CHAN_SW_REQ) { 300 if (!same_peer) 301 ret = -EBUSY; 302 else if (peer_initiator) /* they are the initiator */ 303 ret = -EBUSY; 304 } else if (type == TDLS_MOVE_CH) { 305 ret = -EINVAL; 306 } 307 break; 308 case IWL_MVM_TDLS_SW_ACTIVE: 309 /* 310 * the only valid request when active is a request to return 311 * to the base channel by the current off-channel peer 312 */ 313 if (type != TDLS_MOVE_CH || !same_peer) 314 ret = -EBUSY; 315 break; 316 } 317 318 if (ret) 319 IWL_DEBUG_TDLS(mvm, 320 "Invalid TDLS action %d state %d peer %pM same_peer %d initiator %d\n", 321 type, mvm->tdls_cs.state, peer, same_peer, 322 peer_initiator); 323 324 return ret; 325} 326 327static int 328iwl_mvm_tdls_config_channel_switch(struct iwl_mvm *mvm, 329 struct ieee80211_vif *vif, 330 enum iwl_tdls_channel_switch_type type, 331 const u8 *peer, bool peer_initiator, 332 u8 oper_class, 333 struct cfg80211_chan_def *chandef, 334 u32 timestamp, u16 switch_time, 335 u16 switch_timeout, struct sk_buff *skb, 336 u32 ch_sw_tm_ie) 337{ 338 struct ieee80211_sta *sta; 339 struct iwl_mvm_sta *mvmsta; 340 struct ieee80211_tx_info *info; 341 struct ieee80211_hdr *hdr; 342 struct iwl_tdls_channel_switch_cmd cmd = {0}; 343 struct iwl_tdls_channel_switch_cmd_tail *tail = 344 iwl_mvm_chan_info_cmd_tail(mvm, &cmd.ci); 345 u16 len = sizeof(cmd) - iwl_mvm_chan_info_padding(mvm); 346 int ret; 347 348 lockdep_assert_held(&mvm->mutex); 349 350 ret = iwl_mvm_tdls_check_action(mvm, type, peer, peer_initiator, 351 timestamp); 352 if (ret) 353 return ret; 354 355 if (!skb || WARN_ON(skb->len > IWL_TDLS_CH_SW_FRAME_MAX_SIZE)) { 356 ret = -EINVAL; 357 goto out; 358 } 359 360 cmd.switch_type = type; 361 tail->timing.frame_timestamp = cpu_to_le32(timestamp); 362 tail->timing.switch_time = cpu_to_le32(switch_time); 363 tail->timing.switch_timeout = cpu_to_le32(switch_timeout); 364 365 rcu_read_lock(); 366 sta = ieee80211_find_sta(vif, peer); 367 if (!sta) { 368 rcu_read_unlock(); 369 ret = -ENOENT; 370 goto out; 371 } 372 mvmsta = iwl_mvm_sta_from_mac80211(sta); 373 cmd.peer_sta_id = cpu_to_le32(mvmsta->deflink.sta_id); 374 375 if (!chandef) { 376 if (mvm->tdls_cs.state == IWL_MVM_TDLS_SW_REQ_SENT && 377 mvm->tdls_cs.peer.chandef.chan) { 378 /* actually moving to the channel */ 379 chandef = &mvm->tdls_cs.peer.chandef; 380 } else if (mvm->tdls_cs.state == IWL_MVM_TDLS_SW_ACTIVE && 381 type == TDLS_MOVE_CH) { 382 /* we need to return to base channel */ 383 struct ieee80211_chanctx_conf *chanctx = 384 rcu_dereference(vif->bss_conf.chanctx_conf); 385 386 if (WARN_ON_ONCE(!chanctx)) { 387 rcu_read_unlock(); 388 goto out; 389 } 390 391 chandef = &chanctx->def; 392 } 393 } 394 395 if (chandef) 396 iwl_mvm_set_chan_info_chandef(mvm, &cmd.ci, chandef); 397 398 /* keep quota calculation simple for now - 50% of DTIM for TDLS */ 399 tail->timing.max_offchan_duration = 400 cpu_to_le32(TU_TO_US(vif->bss_conf.dtim_period * 401 vif->bss_conf.beacon_int) / 2); 402 403 /* Switch time is the first element in the switch-timing IE. */ 404 tail->frame.switch_time_offset = cpu_to_le32(ch_sw_tm_ie + 2); 405 406 info = IEEE80211_SKB_CB(skb); 407 hdr = (void *)skb->data; 408 if (info->control.hw_key) { 409 if (info->control.hw_key->cipher != WLAN_CIPHER_SUITE_CCMP) { 410 rcu_read_unlock(); 411 ret = -EINVAL; 412 goto out; 413 } 414 iwl_mvm_set_tx_cmd_ccmp(info, &tail->frame.tx_cmd); 415 } 416 417 iwl_mvm_set_tx_cmd(mvm, skb, &tail->frame.tx_cmd, info, 418 mvmsta->deflink.sta_id); 419 420 iwl_mvm_set_tx_cmd_rate(mvm, &tail->frame.tx_cmd, info, sta, 421 hdr->frame_control); 422 rcu_read_unlock(); 423 424 memcpy(tail->frame.data, skb->data, skb->len); 425 426 ret = iwl_mvm_send_cmd_pdu(mvm, TDLS_CHANNEL_SWITCH_CMD, 0, len, &cmd); 427 if (ret) { 428 IWL_ERR(mvm, "Failed to send TDLS_CHANNEL_SWITCH cmd: %d\n", 429 ret); 430 goto out; 431 } 432 433 /* channel switch has started, update state */ 434 if (type != TDLS_MOVE_CH) { 435 mvm->tdls_cs.cur_sta_id = mvmsta->deflink.sta_id; 436 iwl_mvm_tdls_update_cs_state(mvm, 437 type == TDLS_SEND_CHAN_SW_REQ ? 438 IWL_MVM_TDLS_SW_REQ_SENT : 439 IWL_MVM_TDLS_SW_REQ_RCVD); 440 } else { 441 iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_RESP_RCVD); 442 } 443 444out: 445 446 /* channel switch failed - we are idle */ 447 if (ret) 448 iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_IDLE); 449 450 return ret; 451} 452 453void iwl_mvm_tdls_ch_switch_work(struct work_struct *work) 454{ 455 struct iwl_mvm *mvm; 456 struct ieee80211_sta *sta; 457 struct iwl_mvm_sta *mvmsta; 458 struct ieee80211_vif *vif; 459 unsigned int delay; 460 int ret; 461 462 mvm = container_of(work, struct iwl_mvm, tdls_cs.dwork.work); 463 mutex_lock(&mvm->mutex); 464 465 /* called after an active channel switch has finished or timed-out */ 466 iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_IDLE); 467 468 /* station might be gone, in that case do nothing */ 469 if (mvm->tdls_cs.peer.sta_id == IWL_MVM_INVALID_STA) 470 goto out; 471 472 sta = rcu_dereference_protected( 473 mvm->fw_id_to_mac_id[mvm->tdls_cs.peer.sta_id], 474 lockdep_is_held(&mvm->mutex)); 475 /* the station may not be here, but if it is, it must be a TDLS peer */ 476 if (!sta || IS_ERR(sta) || WARN_ON(!sta->tdls)) 477 goto out; 478 479 mvmsta = iwl_mvm_sta_from_mac80211(sta); 480 vif = mvmsta->vif; 481 ret = iwl_mvm_tdls_config_channel_switch(mvm, vif, 482 TDLS_SEND_CHAN_SW_REQ, 483 sta->addr, 484 mvm->tdls_cs.peer.initiator, 485 mvm->tdls_cs.peer.op_class, 486 &mvm->tdls_cs.peer.chandef, 487 0, 0, 0, 488 mvm->tdls_cs.peer.skb, 489 mvm->tdls_cs.peer.ch_sw_tm_ie); 490 if (ret) 491 IWL_ERR(mvm, "Not sending TDLS channel switch: %d\n", ret); 492 493 /* retry after a DTIM if we failed sending now */ 494 delay = TU_TO_MS(vif->bss_conf.dtim_period * vif->bss_conf.beacon_int); 495 schedule_delayed_work(&mvm->tdls_cs.dwork, msecs_to_jiffies(delay)); 496out: 497 mutex_unlock(&mvm->mutex); 498} 499 500int 501iwl_mvm_tdls_channel_switch(struct ieee80211_hw *hw, 502 struct ieee80211_vif *vif, 503 struct ieee80211_sta *sta, u8 oper_class, 504 struct cfg80211_chan_def *chandef, 505 struct sk_buff *tmpl_skb, u32 ch_sw_tm_ie) 506{ 507 struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw); 508 struct iwl_mvm_sta *mvmsta; 509 unsigned int delay; 510 int ret; 511 512 mutex_lock(&mvm->mutex); 513 514 IWL_DEBUG_TDLS(mvm, "TDLS channel switch with %pM ch %d width %d\n", 515 sta->addr, chandef->chan->center_freq, chandef->width); 516 517 /* we only support a single peer for channel switching */ 518 if (mvm->tdls_cs.peer.sta_id != IWL_MVM_INVALID_STA) { 519 IWL_DEBUG_TDLS(mvm, 520 "Existing peer. Can't start switch with %pM\n", 521 sta->addr); 522 ret = -EBUSY; 523 goto out; 524 } 525 526 ret = iwl_mvm_tdls_config_channel_switch(mvm, vif, 527 TDLS_SEND_CHAN_SW_REQ, 528 sta->addr, sta->tdls_initiator, 529 oper_class, chandef, 0, 0, 0, 530 tmpl_skb, ch_sw_tm_ie); 531 if (ret) 532 goto out; 533 534 /* 535 * Mark the peer as "in tdls switch" for this vif. We only allow a 536 * single such peer per vif. 537 */ 538 mvm->tdls_cs.peer.skb = skb_copy(tmpl_skb, GFP_KERNEL); 539 if (!mvm->tdls_cs.peer.skb) { 540 ret = -ENOMEM; 541 goto out; 542 } 543 544 mvmsta = iwl_mvm_sta_from_mac80211(sta); 545 mvm->tdls_cs.peer.sta_id = mvmsta->deflink.sta_id; 546 mvm->tdls_cs.peer.chandef = *chandef; 547 mvm->tdls_cs.peer.initiator = sta->tdls_initiator; 548 mvm->tdls_cs.peer.op_class = oper_class; 549 mvm->tdls_cs.peer.ch_sw_tm_ie = ch_sw_tm_ie; 550 551 /* 552 * Wait for 2 DTIM periods before attempting the next switch. The next 553 * switch will be made sooner if the current one completes before that. 554 */ 555 delay = 2 * TU_TO_MS(vif->bss_conf.dtim_period * 556 vif->bss_conf.beacon_int); 557 mod_delayed_work(system_wq, &mvm->tdls_cs.dwork, 558 msecs_to_jiffies(delay)); 559 560out: 561 mutex_unlock(&mvm->mutex); 562 return ret; 563} 564 565void iwl_mvm_tdls_cancel_channel_switch(struct ieee80211_hw *hw, 566 struct ieee80211_vif *vif, 567 struct ieee80211_sta *sta) 568{ 569 struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw); 570 struct ieee80211_sta *cur_sta; 571 bool wait_for_phy = false; 572 573 mutex_lock(&mvm->mutex); 574 575 IWL_DEBUG_TDLS(mvm, "TDLS cancel channel switch with %pM\n", sta->addr); 576 577 /* we only support a single peer for channel switching */ 578 if (mvm->tdls_cs.peer.sta_id == IWL_MVM_INVALID_STA) { 579 IWL_DEBUG_TDLS(mvm, "No ch switch peer - %pM\n", sta->addr); 580 goto out; 581 } 582 583 cur_sta = rcu_dereference_protected( 584 mvm->fw_id_to_mac_id[mvm->tdls_cs.peer.sta_id], 585 lockdep_is_held(&mvm->mutex)); 586 /* make sure it's the same peer */ 587 if (cur_sta != sta) 588 goto out; 589 590 /* 591 * If we're currently in a switch because of the now canceled peer, 592 * wait a DTIM here to make sure the phy is back on the base channel. 593 * We can't otherwise force it. 594 */ 595 if (mvm->tdls_cs.cur_sta_id == mvm->tdls_cs.peer.sta_id && 596 mvm->tdls_cs.state != IWL_MVM_TDLS_SW_IDLE) 597 wait_for_phy = true; 598 599 mvm->tdls_cs.peer.sta_id = IWL_MVM_INVALID_STA; 600 dev_kfree_skb(mvm->tdls_cs.peer.skb); 601 mvm->tdls_cs.peer.skb = NULL; 602 603out: 604 mutex_unlock(&mvm->mutex); 605 606 /* make sure the phy is on the base channel */ 607 if (wait_for_phy) 608 msleep(TU_TO_MS(vif->bss_conf.dtim_period * 609 vif->bss_conf.beacon_int)); 610 611 /* flush the channel switch state */ 612 flush_delayed_work(&mvm->tdls_cs.dwork); 613 614 IWL_DEBUG_TDLS(mvm, "TDLS ending channel switch with %pM\n", sta->addr); 615} 616 617void 618iwl_mvm_tdls_recv_channel_switch(struct ieee80211_hw *hw, 619 struct ieee80211_vif *vif, 620 struct ieee80211_tdls_ch_sw_params *params) 621{ 622 struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw); 623 enum iwl_tdls_channel_switch_type type; 624 unsigned int delay; 625 const char *action_str = 626 params->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ? 627 "REQ" : "RESP"; 628 629 mutex_lock(&mvm->mutex); 630 631 IWL_DEBUG_TDLS(mvm, 632 "Received TDLS ch switch action %s from %pM status %d\n", 633 action_str, params->sta->addr, params->status); 634 635 /* 636 * we got a non-zero status from a peer we were switching to - move to 637 * the idle state and retry again later 638 */ 639 if (params->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE && 640 params->status != 0 && 641 mvm->tdls_cs.state == IWL_MVM_TDLS_SW_REQ_SENT && 642 mvm->tdls_cs.cur_sta_id != IWL_MVM_INVALID_STA) { 643 struct ieee80211_sta *cur_sta; 644 645 /* make sure it's the same peer */ 646 cur_sta = rcu_dereference_protected( 647 mvm->fw_id_to_mac_id[mvm->tdls_cs.cur_sta_id], 648 lockdep_is_held(&mvm->mutex)); 649 if (cur_sta == params->sta) { 650 iwl_mvm_tdls_update_cs_state(mvm, 651 IWL_MVM_TDLS_SW_IDLE); 652 goto retry; 653 } 654 } 655 656 type = (params->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST) ? 657 TDLS_SEND_CHAN_SW_RESP_AND_MOVE_CH : TDLS_MOVE_CH; 658 659 iwl_mvm_tdls_config_channel_switch(mvm, vif, type, params->sta->addr, 660 params->sta->tdls_initiator, 0, 661 params->chandef, params->timestamp, 662 params->switch_time, 663 params->switch_timeout, 664 params->tmpl_skb, 665 params->ch_sw_tm_ie); 666 667retry: 668 /* register a timeout in case we don't succeed in switching */ 669 delay = vif->bss_conf.dtim_period * vif->bss_conf.beacon_int * 670 1024 / 1000; 671 mod_delayed_work(system_wq, &mvm->tdls_cs.dwork, 672 msecs_to_jiffies(delay)); 673 mutex_unlock(&mvm->mutex); 674} 675