drivers/net/wireless/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  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of version 2 of the GNU General Public License as
  12  * published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  22  * USA
  23  *
  24  * The full GNU General Public License is included in this distribution
  25  * in the file called COPYING.
  26  *
  27  * Contact Information:
  28  *  Intel Linux Wireless <ilw@linux.intel.com>
  29  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  30  *
  31  * BSD LICENSE
  32  *
  33  * Copyright(c) 2014 Intel Mobile Communications GmbH
  34  * All rights reserved.
  35  *
  36  * Redistribution and use in source and binary forms, with or without
  37  * modification, are permitted provided that the following conditions
  38  * are met:
  39  *
  40  *  * Redistributions of source code must retain the above copyright
  41  *    notice, this list of conditions and the following disclaimer.
  42  *  * Redistributions in binary form must reproduce the above copyright
  43  *    notice, this list of conditions and the following disclaimer in
  44  *    the documentation and/or other materials provided with the
  45  *    distribution.
  46  *  * Neither the name Intel Corporation nor the names of its
  47  *    contributors may be used to endorse or promote products derived
  48  *    from this software without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  51  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  52  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  53  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  54  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  55  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  56  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  57  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  58  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  59  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  60  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  61  *
  62  *****************************************************************************/
  63
  64 #include <linux/etherdevice.h>
  65 #include "mvm.h"
  66 #include "time-event.h"
  67 #include "iwl-io.h"
  68 #include "iwl-prph.h"
  69
  70 #define TU_TO_US(x) (x * 1024)
  71 #define TU_TO_MS(x) (TU_TO_US(x) / 1000)
  72
  73 void iwl_mvm_teardown_tdls_peers(struct iwl_mvm *mvm)
  74 {
  75         struct ieee80211_sta *sta;
  76         struct iwl_mvm_sta *mvmsta;
  77         int i;
  78
  79         lockdep_assert_held(&mvm->mutex);
  80
  81         for (i = 0; i < IWL_MVM_STATION_COUNT; i++) {
  82                 sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i],
  83                                                 lockdep_is_held(&mvm->mutex));
  84                 if (!sta || IS_ERR(sta) || !sta->tdls)
  85                         continue;
  86
  87                 mvmsta = iwl_mvm_sta_from_mac80211(sta);
  88                 ieee80211_tdls_oper_request(mvmsta->vif, sta->addr,
  89                                 NL80211_TDLS_TEARDOWN,
  90                                 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED,
  91                                 GFP_KERNEL);
  92         }
  93 }
  94
  95 int iwl_mvm_tdls_sta_count(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
  96 {
  97         struct ieee80211_sta *sta;
  98         struct iwl_mvm_sta *mvmsta;
  99         int count = 0;
 100         int i;
 101
 102         lockdep_assert_held(&mvm->mutex);
 103
 104         for (i = 0; i < IWL_MVM_STATION_COUNT; i++) {
 105                 sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i],
 106                                                 lockdep_is_held(&mvm->mutex));
 107                 if (!sta || IS_ERR(sta) || !sta->tdls)
 108                         continue;
 109
 110                 if (vif) {
 111                         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 112                         if (mvmsta->vif != vif)
 113                                 continue;
 114                 }
 115
 116                 count++;
 117         }
 118
 119         return count;
 120 }
 121
 122 static void iwl_mvm_tdls_config(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
 123 {
 124         struct iwl_rx_packet *pkt;
 125         struct iwl_tdls_config_res *resp;
 126         struct iwl_tdls_config_cmd tdls_cfg_cmd = {};
 127         struct iwl_host_cmd cmd = {
 128                 .id = TDLS_CONFIG_CMD,
 129                 .flags = CMD_WANT_SKB,
 130                 .data = { &tdls_cfg_cmd, },
 131                 .len = { sizeof(struct iwl_tdls_config_cmd), },
 132         };
 133         struct ieee80211_sta *sta;
 134         int ret, i, cnt;
 135         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 136
 137         lockdep_assert_held(&mvm->mutex);
 138
 139         tdls_cfg_cmd.id_and_color =
 140                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 141         tdls_cfg_cmd.tx_to_ap_tid = IWL_MVM_TDLS_FW_TID;
 142         tdls_cfg_cmd.tx_to_ap_ssn = cpu_to_le16(0); /* not used for now */
 143
 144         /* for now the Tx cmd is empty and unused */
 145
 146         /* populate TDLS peer data */
 147         cnt = 0;
 148         for (i = 0; i < IWL_MVM_STATION_COUNT; i++) {
 149                 sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i],
 150                                                 lockdep_is_held(&mvm->mutex));
 151                 if (IS_ERR_OR_NULL(sta) || !sta->tdls)
 152                         continue;
 153
 154                 tdls_cfg_cmd.sta_info[cnt].sta_id = i;
 155                 tdls_cfg_cmd.sta_info[cnt].tx_to_peer_tid =
 156                                                         IWL_MVM_TDLS_FW_TID;
 157                 tdls_cfg_cmd.sta_info[cnt].tx_to_peer_ssn = cpu_to_le16(0);
 158                 tdls_cfg_cmd.sta_info[cnt].is_initiator =
 159                                 cpu_to_le32(sta->tdls_initiator ? 1 : 0);
 160
 161                 cnt++;
 162         }
 163
 164         tdls_cfg_cmd.tdls_peer_count = cnt;
 165         IWL_DEBUG_TDLS(mvm, "send TDLS config to FW for %d peers\n", cnt);
 166
 167         ret = iwl_mvm_send_cmd(mvm, &cmd);
 168         if (WARN_ON_ONCE(ret))
 169                 return;
 170
 171         pkt = cmd.resp_pkt;
 172         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
 173                 IWL_ERR(mvm, "Bad return from TDLS_CONFIG_COMMAND (0x%08X)\n",
 174                         pkt->hdr.flags);
 175                 goto exit;
 176         }
 177
 178         if (WARN_ON_ONCE(iwl_rx_packet_payload_len(pkt) != sizeof(*resp)))
 179                 goto exit;
 180
 181         /* we don't really care about the response at this point */
 182
 183 exit:
 184         iwl_free_resp(&cmd);
 185 }
 186
 187 void iwl_mvm_recalc_tdls_state(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 188                                bool sta_added)
 189 {
 190         int tdls_sta_cnt = iwl_mvm_tdls_sta_count(mvm, vif);
 191
 192         /* when the first peer joins, send a power update first */
 193         if (tdls_sta_cnt == 1 && sta_added)
 194                 iwl_mvm_power_update_mac(mvm);
 195
 196         /* configure the FW with TDLS peer info */
 197         iwl_mvm_tdls_config(mvm, vif);
 198
 199         /* when the last peer leaves, send a power update last */
 200         if (tdls_sta_cnt == 0 && !sta_added)
 201                 iwl_mvm_power_update_mac(mvm);
 202 }
 203
 204 void iwl_mvm_mac_mgd_protect_tdls_discover(struct ieee80211_hw *hw,
 205                                            struct ieee80211_vif *vif)
 206 {
 207         struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
 208         u32 duration = 2 * vif->bss_conf.dtim_period * vif->bss_conf.beacon_int;
 209
 210         /*
 211          * iwl_mvm_protect_session() reads directly from the device
 212          * (the system time), so make sure it is available.
 213          */
 214         if (iwl_mvm_ref_sync(mvm, IWL_MVM_REF_PROTECT_TDLS))
 215                 return;
 216
 217         mutex_lock(&mvm->mutex);
 218         /* Protect the session to hear the TDLS setup response on the channel */
 219         iwl_mvm_protect_session(mvm, vif, duration, duration, 100, true);
 220         mutex_unlock(&mvm->mutex);
 221
 222         iwl_mvm_unref(mvm, IWL_MVM_REF_PROTECT_TDLS);
 223 }
 224
 225 static const char *
 226 iwl_mvm_tdls_cs_state_str(enum iwl_mvm_tdls_cs_state state)
 227 {
 228         switch (state) {
 229         case IWL_MVM_TDLS_SW_IDLE:
 230                 return "IDLE";
 231         case IWL_MVM_TDLS_SW_REQ_SENT:
 232                 return "REQ SENT";
 233         case IWL_MVM_TDLS_SW_RESP_RCVD:
 234                 return "RESP RECEIVED";
 235         case IWL_MVM_TDLS_SW_REQ_RCVD:
 236                 return "REQ RECEIVED";
 237         case IWL_MVM_TDLS_SW_ACTIVE:
 238                 return "ACTIVE";
 239         }
 240
 241         return NULL;
 242 }
 243
 244 static void iwl_mvm_tdls_update_cs_state(struct iwl_mvm *mvm,
 245                                          enum iwl_mvm_tdls_cs_state state)
 246 {
 247         if (mvm->tdls_cs.state == state)
 248                 return;
 249
 250         IWL_DEBUG_TDLS(mvm, "TDLS channel switch state: %s -> %s\n",
 251                        iwl_mvm_tdls_cs_state_str(mvm->tdls_cs.state),
 252                        iwl_mvm_tdls_cs_state_str(state));
 253         mvm->tdls_cs.state = state;
 254
 255         /* we only send requests to our switching peer - update sent time */
 256         if (state == IWL_MVM_TDLS_SW_REQ_SENT)
 257                 mvm->tdls_cs.peer.sent_timestamp =
 258                         iwl_read_prph(mvm->trans, DEVICE_SYSTEM_TIME_REG);
 259
 260         if (state == IWL_MVM_TDLS_SW_IDLE)
 261                 mvm->tdls_cs.cur_sta_id = IWL_MVM_STATION_COUNT;
 262 }
 263
 264 int iwl_mvm_rx_tdls_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 265                           struct iwl_device_cmd *cmd)
 266 {
 267         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 268         struct iwl_tdls_channel_switch_notif *notif = (void *)pkt->data;
 269         struct ieee80211_sta *sta;
 270         unsigned int delay;
 271         struct iwl_mvm_sta *mvmsta;
 272         struct ieee80211_vif *vif;
 273         u32 sta_id = le32_to_cpu(notif->sta_id);
 274
 275         lockdep_assert_held(&mvm->mutex);
 276
 277         /* can fail sometimes */
 278         if (!le32_to_cpu(notif->status)) {
 279                 iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_IDLE);
 280                 goto out;
 281         }
 282
 283         if (WARN_ON(sta_id >= IWL_MVM_STATION_COUNT))
 284                 goto out;
 285
 286         sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[sta_id],
 287                                         lockdep_is_held(&mvm->mutex));
 288         /* the station may not be here, but if it is, it must be a TDLS peer */
 289         if (IS_ERR_OR_NULL(sta) || WARN_ON(!sta->tdls))
 290                 goto out;
 291
 292         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 293         vif = mvmsta->vif;
 294
 295         /*
 296          * Update state and possibly switch again after this is over (DTIM).
 297          * Also convert TU to msec.
 298          */
 299         delay = TU_TO_MS(vif->bss_conf.dtim_period * vif->bss_conf.beacon_int);
 300         mod_delayed_work(system_wq, &mvm->tdls_cs.dwork,
 301                          msecs_to_jiffies(delay));
 302
 303         iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_ACTIVE);
 304
 305 out:
 306         return 0;
 307 }
 308
 309 static int
 310 iwl_mvm_tdls_check_action(struct iwl_mvm *mvm,
 311                           enum iwl_tdls_channel_switch_type type,
 312                           const u8 *peer, bool peer_initiator, u32 timestamp)
 313 {
 314         bool same_peer = false;
 315         int ret = 0;
 316
 317         /* get the existing peer if it's there */
 318         if (mvm->tdls_cs.state != IWL_MVM_TDLS_SW_IDLE &&
 319             mvm->tdls_cs.cur_sta_id != IWL_MVM_STATION_COUNT) {
 320                 struct ieee80211_sta *sta = rcu_dereference_protected(
 321                                 mvm->fw_id_to_mac_id[mvm->tdls_cs.cur_sta_id],
 322                                 lockdep_is_held(&mvm->mutex));
 323                 if (!IS_ERR_OR_NULL(sta))
 324                         same_peer = ether_addr_equal(peer, sta->addr);
 325         }
 326
 327         switch (mvm->tdls_cs.state) {
 328         case IWL_MVM_TDLS_SW_IDLE:
 329                 /*
 330                  * might be spurious packet from the peer after the switch is
 331                  * already done
 332                  */
 333                 if (type == TDLS_MOVE_CH)
 334                         ret = -EINVAL;
 335                 break;
 336         case IWL_MVM_TDLS_SW_REQ_SENT:
 337                 /* only allow requests from the same peer */
 338                 if (!same_peer)
 339                         ret = -EBUSY;
 340                 else if (type == TDLS_SEND_CHAN_SW_RESP_AND_MOVE_CH &&
 341                          !peer_initiator)
 342                         /*
 343                          * We received a ch-switch request while an outgoing
 344                          * one is pending. Allow it if the peer is the link
 345                          * initiator.
 346                          */
 347                         ret = -EBUSY;
 348                 else if (type == TDLS_SEND_CHAN_SW_REQ)
 349                         /* wait for idle before sending another request */
 350                         ret = -EBUSY;
 351                 else if (timestamp <= mvm->tdls_cs.peer.sent_timestamp)
 352                         /* we got a stale response - ignore it */
 353                         ret = -EINVAL;
 354                 break;
 355         case IWL_MVM_TDLS_SW_RESP_RCVD:
 356                 /*
 357                  * we are waiting for the FW to give an "active" notification,
 358                  * so ignore requests in the meantime
 359                  */
 360                 ret = -EBUSY;
 361                 break;
 362         case IWL_MVM_TDLS_SW_REQ_RCVD:
 363                 /* as above, allow the link initiator to proceed */
 364                 if (type == TDLS_SEND_CHAN_SW_REQ) {
 365                         if (!same_peer)
 366                                 ret = -EBUSY;
 367                         else if (peer_initiator) /* they are the initiator */
 368                                 ret = -EBUSY;
 369                 } else if (type == TDLS_MOVE_CH) {
 370                         ret = -EINVAL;
 371                 }
 372                 break;
 373         case IWL_MVM_TDLS_SW_ACTIVE:
 374                 /*
 375                  * the only valid request when active is a request to return
 376                  * to the base channel by the current off-channel peer
 377                  */
 378                 if (type != TDLS_MOVE_CH || !same_peer)
 379                         ret = -EBUSY;
 380                 break;
 381         }
 382
 383         if (ret)
 384                 IWL_DEBUG_TDLS(mvm,
 385                                "Invalid TDLS action %d state %d peer %pM same_peer %d initiator %d\n",
 386                                type, mvm->tdls_cs.state, peer, same_peer,
 387                                peer_initiator);
 388
 389         return ret;
 390 }
 391
 392 static int
 393 iwl_mvm_tdls_config_channel_switch(struct iwl_mvm *mvm,
 394                                    struct ieee80211_vif *vif,
 395                                    enum iwl_tdls_channel_switch_type type,
 396                                    const u8 *peer, bool peer_initiator,
 397                                    u8 oper_class,
 398                                    struct cfg80211_chan_def *chandef,
 399                                    u32 timestamp, u16 switch_time,
 400                                    u16 switch_timeout, struct sk_buff *skb,
 401                                    u32 ch_sw_tm_ie)
 402 {
 403         struct ieee80211_sta *sta;
 404         struct iwl_mvm_sta *mvmsta;
 405         struct ieee80211_tx_info *info;
 406         struct ieee80211_hdr *hdr;
 407         struct iwl_tdls_channel_switch_cmd cmd = {0};
 408         int ret;
 409
 410         lockdep_assert_held(&mvm->mutex);
 411
 412         ret = iwl_mvm_tdls_check_action(mvm, type, peer, peer_initiator,
 413                                         timestamp);
 414         if (ret)
 415                 return ret;
 416
 417         if (!skb || WARN_ON(skb->len > IWL_TDLS_CH_SW_FRAME_MAX_SIZE)) {
 418                 ret = -EINVAL;
 419                 goto out;
 420         }
 421
 422         cmd.switch_type = type;
 423         cmd.timing.frame_timestamp = cpu_to_le32(timestamp);
 424         cmd.timing.switch_time = cpu_to_le32(switch_time);
 425         cmd.timing.switch_timeout = cpu_to_le32(switch_timeout);
 426
 427         rcu_read_lock();
 428         sta = ieee80211_find_sta(vif, peer);
 429         if (!sta) {
 430                 rcu_read_unlock();
 431                 ret = -ENOENT;
 432                 goto out;
 433         }
 434         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 435         cmd.peer_sta_id = cpu_to_le32(mvmsta->sta_id);
 436
 437         if (!chandef) {
 438                 if (mvm->tdls_cs.state == IWL_MVM_TDLS_SW_REQ_SENT &&
 439                     mvm->tdls_cs.peer.chandef.chan) {
 440                         /* actually moving to the channel */
 441                         chandef = &mvm->tdls_cs.peer.chandef;
 442                 } else if (mvm->tdls_cs.state == IWL_MVM_TDLS_SW_ACTIVE &&
 443                            type == TDLS_MOVE_CH) {
 444                         /* we need to return to base channel */
 445                         struct ieee80211_chanctx_conf *chanctx =
 446                                         rcu_dereference(vif->chanctx_conf);
 447
 448                         if (WARN_ON_ONCE(!chanctx)) {
 449                                 rcu_read_unlock();
 450                                 goto out;
 451                         }
 452
 453                         chandef = &chanctx->def;
 454                 }
 455         }
 456
 457         if (chandef) {
 458                 cmd.ci.band = (chandef->chan->band == IEEE80211_BAND_2GHZ ?
 459                                PHY_BAND_24 : PHY_BAND_5);
 460                 cmd.ci.channel = chandef->chan->hw_value;
 461                 cmd.ci.width = iwl_mvm_get_channel_width(chandef);
 462                 cmd.ci.ctrl_pos = iwl_mvm_get_ctrl_pos(chandef);
 463         }
 464
 465         /* keep quota calculation simple for now - 50% of DTIM for TDLS */
 466         cmd.timing.max_offchan_duration =
 467                         cpu_to_le32(TU_TO_US(vif->bss_conf.dtim_period *
 468                                              vif->bss_conf.beacon_int) / 2);
 469
 470         /* Switch time is the first element in the switch-timing IE. */
 471         cmd.frame.switch_time_offset = cpu_to_le32(ch_sw_tm_ie + 2);
 472
 473         info = IEEE80211_SKB_CB(skb);
 474         if (info->control.hw_key)
 475                 iwl_mvm_set_tx_cmd_crypto(mvm, info, &cmd.frame.tx_cmd, skb);
 476
 477         iwl_mvm_set_tx_cmd(mvm, skb, &cmd.frame.tx_cmd, info,
 478                            mvmsta->sta_id);
 479
 480         hdr = (void *)skb->data;
 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_STATION_COUNT)
 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         queue_delayed_work(system_wq, &mvm->tdls_cs.dwork,
 558                            msecs_to_jiffies(delay));
 559 out:
 560         mutex_unlock(&mvm->mutex);
 561 }
 562
 563 int
 564 iwl_mvm_tdls_channel_switch(struct ieee80211_hw *hw,
 565                             struct ieee80211_vif *vif,
 566                             struct ieee80211_sta *sta, u8 oper_class,
 567                             struct cfg80211_chan_def *chandef,
 568                             struct sk_buff *tmpl_skb, u32 ch_sw_tm_ie)
 569 {
 570         struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
 571         struct iwl_mvm_sta *mvmsta;
 572         unsigned int delay;
 573         int ret;
 574
 575         mutex_lock(&mvm->mutex);
 576
 577         IWL_DEBUG_TDLS(mvm, "TDLS channel switch with %pM ch %d width %d\n",
 578                        sta->addr, chandef->chan->center_freq, chandef->width);
 579
 580         /* we only support a single peer for channel switching */
 581         if (mvm->tdls_cs.peer.sta_id != IWL_MVM_STATION_COUNT) {
 582                 IWL_DEBUG_TDLS(mvm,
 583                                "Existing peer. Can't start switch with %pM\n",
 584                                sta->addr);
 585                 ret = -EBUSY;
 586                 goto out;
 587         }
 588
 589         ret = iwl_mvm_tdls_config_channel_switch(mvm, vif,
 590                                                  TDLS_SEND_CHAN_SW_REQ,
 591                                                  sta->addr, sta->tdls_initiator,
 592                                                  oper_class, chandef, 0, 0, 0,
 593                                                  tmpl_skb, ch_sw_tm_ie);
 594         if (ret)
 595                 goto out;
 596
 597         /*
 598          * Mark the peer as "in tdls switch" for this vif. We only allow a
 599          * single such peer per vif.
 600          */
 601         mvm->tdls_cs.peer.skb = skb_copy(tmpl_skb, GFP_KERNEL);
 602         if (!mvm->tdls_cs.peer.skb) {
 603                 ret = -ENOMEM;
 604                 goto out;
 605         }
 606
 607         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 608         mvm->tdls_cs.peer.sta_id = mvmsta->sta_id;
 609         mvm->tdls_cs.peer.chandef = *chandef;
 610         mvm->tdls_cs.peer.initiator = sta->tdls_initiator;
 611         mvm->tdls_cs.peer.op_class = oper_class;
 612         mvm->tdls_cs.peer.ch_sw_tm_ie = ch_sw_tm_ie;
 613
 614         /*
 615          * Wait for 2 DTIM periods before attempting the next switch. The next
 616          * switch will be made sooner if the current one completes before that.
 617          */
 618         delay = 2 * TU_TO_MS(vif->bss_conf.dtim_period *
 619                              vif->bss_conf.beacon_int);
 620         mod_delayed_work(system_wq, &mvm->tdls_cs.dwork,
 621                          msecs_to_jiffies(delay));
 622
 623 out:
 624         mutex_unlock(&mvm->mutex);
 625         return ret;
 626 }
 627
 628 void iwl_mvm_tdls_cancel_channel_switch(struct ieee80211_hw *hw,
 629                                         struct ieee80211_vif *vif,
 630                                         struct ieee80211_sta *sta)
 631 {
 632         struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
 633         struct ieee80211_sta *cur_sta;
 634         bool wait_for_phy = false;
 635
 636         mutex_lock(&mvm->mutex);
 637
 638         IWL_DEBUG_TDLS(mvm, "TDLS cancel channel switch with %pM\n", sta->addr);
 639
 640         /* we only support a single peer for channel switching */
 641         if (mvm->tdls_cs.peer.sta_id == IWL_MVM_STATION_COUNT) {
 642                 IWL_DEBUG_TDLS(mvm, "No ch switch peer - %pM\n", sta->addr);
 643                 goto out;
 644         }
 645
 646         cur_sta = rcu_dereference_protected(
 647                                 mvm->fw_id_to_mac_id[mvm->tdls_cs.peer.sta_id],
 648                                 lockdep_is_held(&mvm->mutex));
 649         /* make sure it's the same peer */
 650         if (cur_sta != sta)
 651                 goto out;
 652
 653         /*
 654          * If we're currently in a switch because of the now canceled peer,
 655          * wait a DTIM here to make sure the phy is back on the base channel.
 656          * We can't otherwise force it.
 657          */
 658         if (mvm->tdls_cs.cur_sta_id == mvm->tdls_cs.peer.sta_id &&
 659             mvm->tdls_cs.state != IWL_MVM_TDLS_SW_IDLE)
 660                 wait_for_phy = true;
 661
 662         mvm->tdls_cs.peer.sta_id = IWL_MVM_STATION_COUNT;
 663         dev_kfree_skb(mvm->tdls_cs.peer.skb);
 664         mvm->tdls_cs.peer.skb = NULL;
 665
 666 out:
 667         mutex_unlock(&mvm->mutex);
 668
 669         /* make sure the phy is on the base channel */
 670         if (wait_for_phy)
 671                 msleep(TU_TO_MS(vif->bss_conf.dtim_period *
 672                                 vif->bss_conf.beacon_int));
 673
 674         /* flush the channel switch state */
 675         flush_delayed_work(&mvm->tdls_cs.dwork);
 676
 677         IWL_DEBUG_TDLS(mvm, "TDLS ending channel switch with %pM\n", sta->addr);
 678 }
 679
 680 void
 681 iwl_mvm_tdls_recv_channel_switch(struct ieee80211_hw *hw,
 682                                  struct ieee80211_vif *vif,
 683                                  struct ieee80211_tdls_ch_sw_params *params)
 684 {
 685         struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
 686         enum iwl_tdls_channel_switch_type type;
 687         unsigned int delay;
 688         const char *action_str =
 689                 params->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ?
 690                 "REQ" : "RESP";
 691
 692         mutex_lock(&mvm->mutex);
 693
 694         IWL_DEBUG_TDLS(mvm,
 695                        "Received TDLS ch switch action %s from %pM status %d\n",
 696                        action_str, params->sta->addr, params->status);
 697
 698         /*
 699          * we got a non-zero status from a peer we were switching to - move to
 700          * the idle state and retry again later
 701          */
 702         if (params->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE &&
 703             params->status != 0 &&
 704             mvm->tdls_cs.state == IWL_MVM_TDLS_SW_REQ_SENT &&
 705             mvm->tdls_cs.cur_sta_id != IWL_MVM_STATION_COUNT) {
 706                 struct ieee80211_sta *cur_sta;
 707
 708                 /* make sure it's the same peer */
 709                 cur_sta = rcu_dereference_protected(
 710                                 mvm->fw_id_to_mac_id[mvm->tdls_cs.cur_sta_id],
 711                                 lockdep_is_held(&mvm->mutex));
 712                 if (cur_sta == params->sta) {
 713                         iwl_mvm_tdls_update_cs_state(mvm,
 714                                                      IWL_MVM_TDLS_SW_IDLE);
 715                         goto retry;
 716                 }
 717         }
 718
 719         type = (params->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST) ?
 720                TDLS_SEND_CHAN_SW_RESP_AND_MOVE_CH : TDLS_MOVE_CH;
 721
 722         iwl_mvm_tdls_config_channel_switch(mvm, vif, type, params->sta->addr,
 723                                            params->sta->tdls_initiator, 0,
 724                                            params->chandef, params->timestamp,
 725                                            params->switch_time,
 726                                            params->switch_timeout,
 727                                            params->tmpl_skb,
 728                                            params->ch_sw_tm_ie);
 729
 730 retry:
 731         /* register a timeout in case we don't succeed in switching */
 732         delay = vif->bss_conf.dtim_period * vif->bss_conf.beacon_int *
 733                 1024 / 1000;
 734         mod_delayed_work(system_wq, &mvm->tdls_cs.dwork,
 735                          msecs_to_jiffies(delay));
 736         mutex_unlock(&mvm->mutex);
 737 }