drivers/net/wireless/intel/iwlwifi/mvm/tdls.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) 2014 Intel Mobile Communications GmbH
   9  * Copyright(c) 2017 Intel Deutschland GmbH
  10  * Copyright(C) 2018 Intel Corporation
  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  * The full GNU General Public License is included in this distribution
  22  * in the file called COPYING.
  23  *
  24  * Contact Information:
  25  *  Intel Linux Wireless <linuxwifi@intel.com>
  26  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  27  *
  28  * BSD LICENSE
  29  *
  30  * Copyright(c) 2014 Intel Mobile Communications GmbH
  31  * Copyright(c) 2017 Intel Deutschland GmbH
  32  * Copyright(C) 2018 Intel Corporation
  33  * All rights reserved.
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  35  * Redistribution and use in source and binary forms, with or without
  36  * modification, are permitted provided that the following conditions
  37  * are met:
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  39  *  * Redistributions of source code must retain the above copyright
  40  *    notice, this list of conditions and the following disclaimer.
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  42  *    notice, this list of conditions and the following disclaimer in
  43  *    the documentation and/or other materials provided with the
  44  *    distribution.
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  46  *    contributors may be used to endorse or promote products derived
  47  *    from this software without specific prior written permission.
  48  *
  49  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  50  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  51  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  52  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  53  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  54  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  55  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  56  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  57  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  58  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  59  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  60  *
  61  *****************************************************************************/
  62
  63 #include <linux/etherdevice.h>
  64 #include "mvm.h"
  65 #include "time-event.h"
  66 #include "iwl-io.h"
  67 #include "iwl-prph.h"
  68
  69 #define TU_TO_US(x) (x * 1024)
  70 #define TU_TO_MS(x) (TU_TO_US(x) / 1000)
  71
  72 void iwl_mvm_teardown_tdls_peers(struct iwl_mvm *mvm)
  73 {
  74         struct ieee80211_sta *sta;
  75         struct iwl_mvm_sta *mvmsta;
  76         int i;
  77
  78         lockdep_assert_held(&mvm->mutex);
  79
  80         for (i = 0; i < ARRAY_SIZE(mvm->fw_id_to_mac_id); i++) {
  81                 sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i],
  82                                                 lockdep_is_held(&mvm->mutex));
  83                 if (!sta || IS_ERR(sta) || !sta->tdls)
  84                         continue;
  85
  86                 mvmsta = iwl_mvm_sta_from_mac80211(sta);
  87                 ieee80211_tdls_oper_request(mvmsta->vif, sta->addr,
  88                                 NL80211_TDLS_TEARDOWN,
  89                                 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED,
  90                                 GFP_KERNEL);
  91         }
  92 }
  93
  94 int iwl_mvm_tdls_sta_count(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
  95 {
  96         struct ieee80211_sta *sta;
  97         struct iwl_mvm_sta *mvmsta;
  98         int count = 0;
  99         int i;
 100
 101         lockdep_assert_held(&mvm->mutex);
 102
 103         for (i = 0; i < ARRAY_SIZE(mvm->fw_id_to_mac_id); i++) {
 104                 sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i],
 105                                                 lockdep_is_held(&mvm->mutex));
 106                 if (!sta || IS_ERR(sta) || !sta->tdls)
 107                         continue;
 108
 109                 if (vif) {
 110                         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 111                         if (mvmsta->vif != vif)
 112                                 continue;
 113                 }
 114
 115                 count++;
 116         }
 117
 118         return count;
 119 }
 120
 121 static void iwl_mvm_tdls_config(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
 122 {
 123         struct iwl_rx_packet *pkt;
 124         struct iwl_tdls_config_res *resp;
 125         struct iwl_tdls_config_cmd tdls_cfg_cmd = {};
 126         struct iwl_host_cmd cmd = {
 127                 .id = TDLS_CONFIG_CMD,
 128                 .flags = CMD_WANT_SKB,
 129                 .data = { &tdls_cfg_cmd, },
 130                 .len = { sizeof(struct iwl_tdls_config_cmd), },
 131         };
 132         struct ieee80211_sta *sta;
 133         int ret, i, cnt;
 134         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 135
 136         lockdep_assert_held(&mvm->mutex);
 137
 138         tdls_cfg_cmd.id_and_color =
 139                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 140         tdls_cfg_cmd.tx_to_ap_tid = IWL_MVM_TDLS_FW_TID;
 141         tdls_cfg_cmd.tx_to_ap_ssn = cpu_to_le16(0); /* not used for now */
 142
 143         /* for now the Tx cmd is empty and unused */
 144
 145         /* populate TDLS peer data */
 146         cnt = 0;
 147         for (i = 0; i < ARRAY_SIZE(mvm->fw_id_to_mac_id); i++) {
 148                 sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i],
 149                                                 lockdep_is_held(&mvm->mutex));
 150                 if (IS_ERR_OR_NULL(sta) || !sta->tdls)
 151                         continue;
 152
 153                 tdls_cfg_cmd.sta_info[cnt].sta_id = i;
 154                 tdls_cfg_cmd.sta_info[cnt].tx_to_peer_tid =
 155                                                         IWL_MVM_TDLS_FW_TID;
 156                 tdls_cfg_cmd.sta_info[cnt].tx_to_peer_ssn = cpu_to_le16(0);
 157                 tdls_cfg_cmd.sta_info[cnt].is_initiator =
 158                                 cpu_to_le32(sta->tdls_initiator ? 1 : 0);
 159
 160                 cnt++;
 161         }
 162
 163         tdls_cfg_cmd.tdls_peer_count = cnt;
 164         IWL_DEBUG_TDLS(mvm, "send TDLS config to FW for %d peers\n", cnt);
 165
 166         ret = iwl_mvm_send_cmd(mvm, &cmd);
 167         if (WARN_ON_ONCE(ret))
 168                 return;
 169
 170         pkt = cmd.resp_pkt;
 171
 172         WARN_ON_ONCE(iwl_rx_packet_payload_len(pkt) != sizeof(*resp));
 173
 174         /* we don't really care about the response at this point */
 175
 176         iwl_free_resp(&cmd);
 177 }
 178
 179 void iwl_mvm_recalc_tdls_state(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 180                                bool sta_added)
 181 {
 182         int tdls_sta_cnt = iwl_mvm_tdls_sta_count(mvm, vif);
 183
 184         /* when the first peer joins, send a power update first */
 185         if (tdls_sta_cnt == 1 && sta_added)
 186                 iwl_mvm_power_update_mac(mvm);
 187
 188         /* Configure the FW with TDLS peer info only if TDLS channel switch
 189          * capability is set.
 190          * TDLS config data is used currently only in TDLS channel switch code.
 191          * Supposed to serve also TDLS buffer station which is not implemneted
 192          * yet in FW*/
 193         if (fw_has_capa(&mvm->fw->ucode_capa,
 194                         IWL_UCODE_TLV_CAPA_TDLS_CHANNEL_SWITCH))
 195                 iwl_mvm_tdls_config(mvm, vif);
 196
 197         /* when the last peer leaves, send a power update last */
 198         if (tdls_sta_cnt == 0 && !sta_added)
 199                 iwl_mvm_power_update_mac(mvm);
 200 }
 201
 202 void iwl_mvm_mac_mgd_protect_tdls_discover(struct ieee80211_hw *hw,
 203                                            struct ieee80211_vif *vif)
 204 {
 205         struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
 206         u32 duration = 2 * vif->bss_conf.dtim_period * vif->bss_conf.beacon_int;
 207
 208         /*
 209          * iwl_mvm_protect_session() reads directly from the device
 210          * (the system time), so make sure it is available.
 211          */
 212         if (iwl_mvm_ref_sync(mvm, IWL_MVM_REF_PROTECT_TDLS))
 213                 return;
 214
 215         mutex_lock(&mvm->mutex);
 216         /* Protect the session to hear the TDLS setup response on the channel */
 217         iwl_mvm_protect_session(mvm, vif, duration, duration, 100, true);
 218         mutex_unlock(&mvm->mutex);
 219
 220         iwl_mvm_unref(mvm, IWL_MVM_REF_PROTECT_TDLS);
 221 }
 222
 223 static const char *
 224 iwl_mvm_tdls_cs_state_str(enum iwl_mvm_tdls_cs_state state)
 225 {
 226         switch (state) {
 227         case IWL_MVM_TDLS_SW_IDLE:
 228                 return "IDLE";
 229         case IWL_MVM_TDLS_SW_REQ_SENT:
 230                 return "REQ SENT";
 231         case IWL_MVM_TDLS_SW_RESP_RCVD:
 232                 return "RESP RECEIVED";
 233         case IWL_MVM_TDLS_SW_REQ_RCVD:
 234                 return "REQ RECEIVED";
 235         case IWL_MVM_TDLS_SW_ACTIVE:
 236                 return "ACTIVE";
 237         }
 238
 239         return NULL;
 240 }
 241
 242 static void iwl_mvm_tdls_update_cs_state(struct iwl_mvm *mvm,
 243                                          enum iwl_mvm_tdls_cs_state state)
 244 {
 245         if (mvm->tdls_cs.state == state)
 246                 return;
 247
 248         IWL_DEBUG_TDLS(mvm, "TDLS channel switch state: %s -> %s\n",
 249                        iwl_mvm_tdls_cs_state_str(mvm->tdls_cs.state),
 250                        iwl_mvm_tdls_cs_state_str(state));
 251         mvm->tdls_cs.state = state;
 252
 253         /* we only send requests to our switching peer - update sent time */
 254         if (state == IWL_MVM_TDLS_SW_REQ_SENT)
 255                 mvm->tdls_cs.peer.sent_timestamp =
 256                         iwl_read_prph(mvm->trans, DEVICE_SYSTEM_TIME_REG);
 257
 258         if (state == IWL_MVM_TDLS_SW_IDLE)
 259                 mvm->tdls_cs.cur_sta_id = IWL_MVM_INVALID_STA;
 260 }
 261
 262 void iwl_mvm_rx_tdls_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
 263 {
 264         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 265         struct iwl_tdls_channel_switch_notif *notif = (void *)pkt->data;
 266         struct ieee80211_sta *sta;
 267         unsigned int delay;
 268         struct iwl_mvm_sta *mvmsta;
 269         struct ieee80211_vif *vif;
 270         u32 sta_id = le32_to_cpu(notif->sta_id);
 271
 272         lockdep_assert_held(&mvm->mutex);
 273
 274         /* can fail sometimes */
 275         if (!le32_to_cpu(notif->status)) {
 276                 iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_IDLE);
 277                 return;
 278         }
 279
 280         if (WARN_ON(sta_id >= IWL_MVM_STATION_COUNT))
 281                 return;
 282
 283         sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[sta_id],
 284                                         lockdep_is_held(&mvm->mutex));
 285         /* the station may not be here, but if it is, it must be a TDLS peer */
 286         if (IS_ERR_OR_NULL(sta) || WARN_ON(!sta->tdls))
 287                 return;
 288
 289         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 290         vif = mvmsta->vif;
 291
 292         /*
 293          * Update state and possibly switch again after this is over (DTIM).
 294          * Also convert TU to msec.
 295          */
 296         delay = TU_TO_MS(vif->bss_conf.dtim_period * vif->bss_conf.beacon_int);
 297         mod_delayed_work(system_wq, &mvm->tdls_cs.dwork,
 298                          msecs_to_jiffies(delay));
 299
 300         iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_ACTIVE);
 301 }
 302
 303 static int
 304 iwl_mvm_tdls_check_action(struct iwl_mvm *mvm,
 305                           enum iwl_tdls_channel_switch_type type,
 306                           const u8 *peer, bool peer_initiator, u32 timestamp)
 307 {
 308         bool same_peer = false;
 309         int ret = 0;
 310
 311         /* get the existing peer if it's there */
 312         if (mvm->tdls_cs.state != IWL_MVM_TDLS_SW_IDLE &&
 313             mvm->tdls_cs.cur_sta_id != IWL_MVM_INVALID_STA) {
 314                 struct ieee80211_sta *sta = rcu_dereference_protected(
 315                                 mvm->fw_id_to_mac_id[mvm->tdls_cs.cur_sta_id],
 316                                 lockdep_is_held(&mvm->mutex));
 317                 if (!IS_ERR_OR_NULL(sta))
 318                         same_peer = ether_addr_equal(peer, sta->addr);
 319         }
 320
 321         switch (mvm->tdls_cs.state) {
 322         case IWL_MVM_TDLS_SW_IDLE:
 323                 /*
 324                  * might be spurious packet from the peer after the switch is
 325                  * already done
 326                  */
 327                 if (type == TDLS_MOVE_CH)
 328                         ret = -EINVAL;
 329                 break;
 330         case IWL_MVM_TDLS_SW_REQ_SENT:
 331                 /* only allow requests from the same peer */
 332                 if (!same_peer)
 333                         ret = -EBUSY;
 334                 else if (type == TDLS_SEND_CHAN_SW_RESP_AND_MOVE_CH &&
 335                          !peer_initiator)
 336                         /*
 337                          * We received a ch-switch request while an outgoing
 338                          * one is pending. Allow it if the peer is the link
 339                          * initiator.
 340                          */
 341                         ret = -EBUSY;
 342                 else if (type == TDLS_SEND_CHAN_SW_REQ)
 343                         /* wait for idle before sending another request */
 344                         ret = -EBUSY;
 345                 else if (timestamp <= mvm->tdls_cs.peer.sent_timestamp)
 346                         /* we got a stale response - ignore it */
 347                         ret = -EINVAL;
 348                 break;
 349         case IWL_MVM_TDLS_SW_RESP_RCVD:
 350                 /*
 351                  * we are waiting for the FW to give an "active" notification,
 352                  * so ignore requests in the meantime
 353                  */
 354                 ret = -EBUSY;
 355                 break;
 356         case IWL_MVM_TDLS_SW_REQ_RCVD:
 357                 /* as above, allow the link initiator to proceed */
 358                 if (type == TDLS_SEND_CHAN_SW_REQ) {
 359                         if (!same_peer)
 360                                 ret = -EBUSY;
 361                         else if (peer_initiator) /* they are the initiator */
 362                                 ret = -EBUSY;
 363                 } else if (type == TDLS_MOVE_CH) {
 364                         ret = -EINVAL;
 365                 }
 366                 break;
 367         case IWL_MVM_TDLS_SW_ACTIVE:
 368                 /*
 369                  * the only valid request when active is a request to return
 370                  * to the base channel by the current off-channel peer
 371                  */
 372                 if (type != TDLS_MOVE_CH || !same_peer)
 373                         ret = -EBUSY;
 374                 break;
 375         }
 376
 377         if (ret)
 378                 IWL_DEBUG_TDLS(mvm,
 379                                "Invalid TDLS action %d state %d peer %pM same_peer %d initiator %d\n",
 380                                type, mvm->tdls_cs.state, peer, same_peer,
 381                                peer_initiator);
 382
 383         return ret;
 384 }
 385
 386 static int
 387 iwl_mvm_tdls_config_channel_switch(struct iwl_mvm *mvm,
 388                                    struct ieee80211_vif *vif,
 389                                    enum iwl_tdls_channel_switch_type type,
 390                                    const u8 *peer, bool peer_initiator,
 391                                    u8 oper_class,
 392                                    struct cfg80211_chan_def *chandef,
 393                                    u32 timestamp, u16 switch_time,
 394                                    u16 switch_timeout, struct sk_buff *skb,
 395                                    u32 ch_sw_tm_ie)
 396 {
 397         struct ieee80211_sta *sta;
 398         struct iwl_mvm_sta *mvmsta;
 399         struct ieee80211_tx_info *info;
 400         struct ieee80211_hdr *hdr;
 401         struct iwl_tdls_channel_switch_cmd cmd = {0};
 402         int ret;
 403
 404         lockdep_assert_held(&mvm->mutex);
 405
 406         ret = iwl_mvm_tdls_check_action(mvm, type, peer, peer_initiator,
 407                                         timestamp);
 408         if (ret)
 409                 return ret;
 410
 411         if (!skb || WARN_ON(skb->len > IWL_TDLS_CH_SW_FRAME_MAX_SIZE)) {
 412                 ret = -EINVAL;
 413                 goto out;
 414         }
 415
 416         cmd.switch_type = type;
 417         cmd.timing.frame_timestamp = cpu_to_le32(timestamp);
 418         cmd.timing.switch_time = cpu_to_le32(switch_time);
 419         cmd.timing.switch_timeout = cpu_to_le32(switch_timeout);
 420
 421         rcu_read_lock();
 422         sta = ieee80211_find_sta(vif, peer);
 423         if (!sta) {
 424                 rcu_read_unlock();
 425                 ret = -ENOENT;
 426                 goto out;
 427         }
 428         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 429         cmd.peer_sta_id = cpu_to_le32(mvmsta->sta_id);
 430
 431         if (!chandef) {
 432                 if (mvm->tdls_cs.state == IWL_MVM_TDLS_SW_REQ_SENT &&
 433                     mvm->tdls_cs.peer.chandef.chan) {
 434                         /* actually moving to the channel */
 435                         chandef = &mvm->tdls_cs.peer.chandef;
 436                 } else if (mvm->tdls_cs.state == IWL_MVM_TDLS_SW_ACTIVE &&
 437                            type == TDLS_MOVE_CH) {
 438                         /* we need to return to base channel */
 439                         struct ieee80211_chanctx_conf *chanctx =
 440                                         rcu_dereference(vif->chanctx_conf);
 441
 442                         if (WARN_ON_ONCE(!chanctx)) {
 443                                 rcu_read_unlock();
 444                                 goto out;
 445                         }
 446
 447                         chandef = &chanctx->def;
 448                 }
 449         }
 450
 451         if (chandef) {
 452                 cmd.ci.band = (chandef->chan->band == NL80211_BAND_2GHZ ?
 453                                PHY_BAND_24 : PHY_BAND_5);
 454                 cmd.ci.channel = chandef->chan->hw_value;
 455                 cmd.ci.width = iwl_mvm_get_channel_width(chandef);
 456                 cmd.ci.ctrl_pos = iwl_mvm_get_ctrl_pos(chandef);
 457         }
 458
 459         /* keep quota calculation simple for now - 50% of DTIM for TDLS */
 460         cmd.timing.max_offchan_duration =
 461                         cpu_to_le32(TU_TO_US(vif->bss_conf.dtim_period *
 462                                              vif->bss_conf.beacon_int) / 2);
 463
 464         /* Switch time is the first element in the switch-timing IE. */
 465         cmd.frame.switch_time_offset = cpu_to_le32(ch_sw_tm_ie + 2);
 466
 467         info = IEEE80211_SKB_CB(skb);
 468         hdr = (void *)skb->data;
 469         if (info->control.hw_key) {
 470                 if (info->control.hw_key->cipher != WLAN_CIPHER_SUITE_CCMP) {
 471                         rcu_read_unlock();
 472                         ret = -EINVAL;
 473                         goto out;
 474                 }
 475                 iwl_mvm_set_tx_cmd_ccmp(info, &cmd.frame.tx_cmd);
 476         }
 477
 478         iwl_mvm_set_tx_cmd(mvm, skb, &cmd.frame.tx_cmd, info,
 479                            mvmsta->sta_id);
 480
 481         iwl_mvm_set_tx_cmd_rate(mvm, &cmd.frame.tx_cmd, info, sta,
 482                                 hdr->frame_control);
 483         rcu_read_unlock();
 484
 485         memcpy(cmd.frame.data, skb->data, skb->len);
 486
 487         ret = iwl_mvm_send_cmd_pdu(mvm, TDLS_CHANNEL_SWITCH_CMD, 0,
 488                                    sizeof(cmd), &cmd);
 489         if (ret) {
 490                 IWL_ERR(mvm, "Failed to send TDLS_CHANNEL_SWITCH cmd: %d\n",
 491                         ret);
 492                 goto out;
 493         }
 494
 495         /* channel switch has started, update state */
 496         if (type != TDLS_MOVE_CH) {
 497                 mvm->tdls_cs.cur_sta_id = mvmsta->sta_id;
 498                 iwl_mvm_tdls_update_cs_state(mvm,
 499                                              type == TDLS_SEND_CHAN_SW_REQ ?
 500                                              IWL_MVM_TDLS_SW_REQ_SENT :
 501                                              IWL_MVM_TDLS_SW_REQ_RCVD);
 502         } else {
 503                 iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_RESP_RCVD);
 504         }
 505
 506 out:
 507
 508         /* channel switch failed - we are idle */
 509         if (ret)
 510                 iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_IDLE);
 511
 512         return ret;
 513 }
 514
 515 void iwl_mvm_tdls_ch_switch_work(struct work_struct *work)
 516 {
 517         struct iwl_mvm *mvm;
 518         struct ieee80211_sta *sta;
 519         struct iwl_mvm_sta *mvmsta;
 520         struct ieee80211_vif *vif;
 521         unsigned int delay;
 522         int ret;
 523
 524         mvm = container_of(work, struct iwl_mvm, tdls_cs.dwork.work);
 525         mutex_lock(&mvm->mutex);
 526
 527         /* called after an active channel switch has finished or timed-out */
 528         iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_IDLE);
 529
 530         /* station might be gone, in that case do nothing */
 531         if (mvm->tdls_cs.peer.sta_id == IWL_MVM_INVALID_STA)
 532                 goto out;
 533
 534         sta = rcu_dereference_protected(
 535                                 mvm->fw_id_to_mac_id[mvm->tdls_cs.peer.sta_id],
 536                                 lockdep_is_held(&mvm->mutex));
 537         /* the station may not be here, but if it is, it must be a TDLS peer */
 538         if (!sta || IS_ERR(sta) || WARN_ON(!sta->tdls))
 539                 goto out;
 540
 541         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 542         vif = mvmsta->vif;
 543         ret = iwl_mvm_tdls_config_channel_switch(mvm, vif,
 544                                                  TDLS_SEND_CHAN_SW_REQ,
 545                                                  sta->addr,
 546                                                  mvm->tdls_cs.peer.initiator,
 547                                                  mvm->tdls_cs.peer.op_class,
 548                                                  &mvm->tdls_cs.peer.chandef,
 549                                                  0, 0, 0,
 550                                                  mvm->tdls_cs.peer.skb,
 551                                                  mvm->tdls_cs.peer.ch_sw_tm_ie);
 552         if (ret)
 553                 IWL_ERR(mvm, "Not sending TDLS channel switch: %d\n", ret);
 554
 555         /* retry after a DTIM if we failed sending now */
 556         delay = TU_TO_MS(vif->bss_conf.dtim_period * vif->bss_conf.beacon_int);
 557         schedule_delayed_work(&mvm->tdls_cs.dwork, msecs_to_jiffies(delay));
 558 out:
 559         mutex_unlock(&mvm->mutex);
 560 }
 561
 562 int
 563 iwl_mvm_tdls_channel_switch(struct ieee80211_hw *hw,
 564                             struct ieee80211_vif *vif,
 565                             struct ieee80211_sta *sta, u8 oper_class,
 566                             struct cfg80211_chan_def *chandef,
 567                             struct sk_buff *tmpl_skb, u32 ch_sw_tm_ie)
 568 {
 569         struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
 570         struct iwl_mvm_sta *mvmsta;
 571         unsigned int delay;
 572         int ret;
 573
 574         mutex_lock(&mvm->mutex);
 575
 576         IWL_DEBUG_TDLS(mvm, "TDLS channel switch with %pM ch %d width %d\n",
 577                        sta->addr, chandef->chan->center_freq, chandef->width);
 578
 579         /* we only support a single peer for channel switching */
 580         if (mvm->tdls_cs.peer.sta_id != IWL_MVM_INVALID_STA) {
 581                 IWL_DEBUG_TDLS(mvm,
 582                                "Existing peer. Can't start switch with %pM\n",
 583                                sta->addr);
 584                 ret = -EBUSY;
 585                 goto out;
 586         }
 587
 588         ret = iwl_mvm_tdls_config_channel_switch(mvm, vif,
 589                                                  TDLS_SEND_CHAN_SW_REQ,
 590                                                  sta->addr, sta->tdls_initiator,
 591                                                  oper_class, chandef, 0, 0, 0,
 592                                                  tmpl_skb, ch_sw_tm_ie);
 593         if (ret)
 594                 goto out;
 595
 596         /*
 597          * Mark the peer as "in tdls switch" for this vif. We only allow a
 598          * single such peer per vif.
 599          */
 600         mvm->tdls_cs.peer.skb = skb_copy(tmpl_skb, GFP_KERNEL);
 601         if (!mvm->tdls_cs.peer.skb) {
 602                 ret = -ENOMEM;
 603                 goto out;
 604         }
 605
 606         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 607         mvm->tdls_cs.peer.sta_id = mvmsta->sta_id;
 608         mvm->tdls_cs.peer.chandef = *chandef;
 609         mvm->tdls_cs.peer.initiator = sta->tdls_initiator;
 610         mvm->tdls_cs.peer.op_class = oper_class;
 611         mvm->tdls_cs.peer.ch_sw_tm_ie = ch_sw_tm_ie;
 612
 613         /*
 614          * Wait for 2 DTIM periods before attempting the next switch. The next
 615          * switch will be made sooner if the current one completes before that.
 616          */
 617         delay = 2 * TU_TO_MS(vif->bss_conf.dtim_period *
 618                              vif->bss_conf.beacon_int);
 619         mod_delayed_work(system_wq, &mvm->tdls_cs.dwork,
 620                          msecs_to_jiffies(delay));
 621
 622 out:
 623         mutex_unlock(&mvm->mutex);
 624         return ret;
 625 }
 626
 627 void iwl_mvm_tdls_cancel_channel_switch(struct ieee80211_hw *hw,
 628                                         struct ieee80211_vif *vif,
 629                                         struct ieee80211_sta *sta)
 630 {
 631         struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
 632         struct ieee80211_sta *cur_sta;
 633         bool wait_for_phy = false;
 634
 635         mutex_lock(&mvm->mutex);
 636
 637         IWL_DEBUG_TDLS(mvm, "TDLS cancel channel switch with %pM\n", sta->addr);
 638
 639         /* we only support a single peer for channel switching */
 640         if (mvm->tdls_cs.peer.sta_id == IWL_MVM_INVALID_STA) {
 641                 IWL_DEBUG_TDLS(mvm, "No ch switch peer - %pM\n", sta->addr);
 642                 goto out;
 643         }
 644
 645         cur_sta = rcu_dereference_protected(
 646                                 mvm->fw_id_to_mac_id[mvm->tdls_cs.peer.sta_id],
 647                                 lockdep_is_held(&mvm->mutex));
 648         /* make sure it's the same peer */
 649         if (cur_sta != sta)
 650                 goto out;
 651
 652         /*
 653          * If we're currently in a switch because of the now canceled peer,
 654          * wait a DTIM here to make sure the phy is back on the base channel.
 655          * We can't otherwise force it.
 656          */
 657         if (mvm->tdls_cs.cur_sta_id == mvm->tdls_cs.peer.sta_id &&
 658             mvm->tdls_cs.state != IWL_MVM_TDLS_SW_IDLE)
 659                 wait_for_phy = true;
 660
 661         mvm->tdls_cs.peer.sta_id = IWL_MVM_INVALID_STA;
 662         dev_kfree_skb(mvm->tdls_cs.peer.skb);
 663         mvm->tdls_cs.peer.skb = NULL;
 664
 665 out:
 666         mutex_unlock(&mvm->mutex);
 667
 668         /* make sure the phy is on the base channel */
 669         if (wait_for_phy)
 670                 msleep(TU_TO_MS(vif->bss_conf.dtim_period *
 671                                 vif->bss_conf.beacon_int));
 672
 673         /* flush the channel switch state */
 674         flush_delayed_work(&mvm->tdls_cs.dwork);
 675
 676         IWL_DEBUG_TDLS(mvm, "TDLS ending channel switch with %pM\n", sta->addr);
 677 }
 678
 679 void
 680 iwl_mvm_tdls_recv_channel_switch(struct ieee80211_hw *hw,
 681                                  struct ieee80211_vif *vif,
 682                                  struct ieee80211_tdls_ch_sw_params *params)
 683 {
 684         struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
 685         enum iwl_tdls_channel_switch_type type;
 686         unsigned int delay;
 687         const char *action_str =
 688                 params->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ?
 689                 "REQ" : "RESP";
 690
 691         mutex_lock(&mvm->mutex);
 692
 693         IWL_DEBUG_TDLS(mvm,
 694                        "Received TDLS ch switch action %s from %pM status %d\n",
 695                        action_str, params->sta->addr, params->status);
 696
 697         /*
 698          * we got a non-zero status from a peer we were switching to - move to
 699          * the idle state and retry again later
 700          */
 701         if (params->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE &&
 702             params->status != 0 &&
 703             mvm->tdls_cs.state == IWL_MVM_TDLS_SW_REQ_SENT &&
 704             mvm->tdls_cs.cur_sta_id != IWL_MVM_INVALID_STA) {
 705                 struct ieee80211_sta *cur_sta;
 706
 707                 /* make sure it's the same peer */
 708                 cur_sta = rcu_dereference_protected(
 709                                 mvm->fw_id_to_mac_id[mvm->tdls_cs.cur_sta_id],
 710                                 lockdep_is_held(&mvm->mutex));
 711                 if (cur_sta == params->sta) {
 712                         iwl_mvm_tdls_update_cs_state(mvm,
 713                                                      IWL_MVM_TDLS_SW_IDLE);
 714                         goto retry;
 715                 }
 716         }
 717
 718         type = (params->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST) ?
 719                TDLS_SEND_CHAN_SW_RESP_AND_MOVE_CH : TDLS_MOVE_CH;
 720
 721         iwl_mvm_tdls_config_channel_switch(mvm, vif, type, params->sta->addr,
 722                                            params->sta->tdls_initiator, 0,
 723                                            params->chandef, params->timestamp,
 724                                            params->switch_time,
 725                                            params->switch_timeout,
 726                                            params->tmpl_skb,
 727                                            params->ch_sw_tm_ie);
 728
 729 retry:
 730         /* register a timeout in case we don't succeed in switching */
 731         delay = vif->bss_conf.dtim_period * vif->bss_conf.beacon_int *
 732                 1024 / 1000;
 733         mod_delayed_work(system_wq, &mvm->tdls_cs.dwork,
 734                          msecs_to_jiffies(delay));
 735         mutex_unlock(&mvm->mutex);
 736 }