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  *
  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 <linuxwifi@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
 173         WARN_ON_ONCE(iwl_rx_packet_payload_len(pkt) != sizeof(*resp));
 174
 175         /* we don't really care about the response at this point */
 176
 177         iwl_free_resp(&cmd);
 178 }
 179
 180 void iwl_mvm_recalc_tdls_state(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 181                                bool sta_added)
 182 {
 183         int tdls_sta_cnt = iwl_mvm_tdls_sta_count(mvm, vif);
 184
 185         /* when the first peer joins, send a power update first */
 186         if (tdls_sta_cnt == 1 && sta_added)
 187                 iwl_mvm_power_update_mac(mvm);
 188
 189         /* configure the FW with TDLS peer info */
 190         iwl_mvm_tdls_config(mvm, vif);
 191
 192         /* when the last peer leaves, send a power update last */
 193         if (tdls_sta_cnt == 0 && !sta_added)
 194                 iwl_mvm_power_update_mac(mvm);
 195 }
 196
 197 void iwl_mvm_mac_mgd_protect_tdls_discover(struct ieee80211_hw *hw,
 198                                            struct ieee80211_vif *vif)
 199 {
 200         struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
 201         u32 duration = 2 * vif->bss_conf.dtim_period * vif->bss_conf.beacon_int;
 202
 203         /*
 204          * iwl_mvm_protect_session() reads directly from the device
 205          * (the system time), so make sure it is available.
 206          */
 207         if (iwl_mvm_ref_sync(mvm, IWL_MVM_REF_PROTECT_TDLS))
 208                 return;
 209
 210         mutex_lock(&mvm->mutex);
 211         /* Protect the session to hear the TDLS setup response on the channel */
 212         iwl_mvm_protect_session(mvm, vif, duration, duration, 100, true);
 213         mutex_unlock(&mvm->mutex);
 214
 215         iwl_mvm_unref(mvm, IWL_MVM_REF_PROTECT_TDLS);
 216 }
 217
 218 static const char *
 219 iwl_mvm_tdls_cs_state_str(enum iwl_mvm_tdls_cs_state state)
 220 {
 221         switch (state) {
 222         case IWL_MVM_TDLS_SW_IDLE:
 223                 return "IDLE";
 224         case IWL_MVM_TDLS_SW_REQ_SENT:
 225                 return "REQ SENT";
 226         case IWL_MVM_TDLS_SW_RESP_RCVD:
 227                 return "RESP RECEIVED";
 228         case IWL_MVM_TDLS_SW_REQ_RCVD:
 229                 return "REQ RECEIVED";
 230         case IWL_MVM_TDLS_SW_ACTIVE:
 231                 return "ACTIVE";
 232         }
 233
 234         return NULL;
 235 }
 236
 237 static void iwl_mvm_tdls_update_cs_state(struct iwl_mvm *mvm,
 238                                          enum iwl_mvm_tdls_cs_state state)
 239 {
 240         if (mvm->tdls_cs.state == state)
 241                 return;
 242
 243         IWL_DEBUG_TDLS(mvm, "TDLS channel switch state: %s -> %s\n",
 244                        iwl_mvm_tdls_cs_state_str(mvm->tdls_cs.state),
 245                        iwl_mvm_tdls_cs_state_str(state));
 246         mvm->tdls_cs.state = state;
 247
 248         /* we only send requests to our switching peer - update sent time */
 249         if (state == IWL_MVM_TDLS_SW_REQ_SENT)
 250                 mvm->tdls_cs.peer.sent_timestamp =
 251                         iwl_read_prph(mvm->trans, DEVICE_SYSTEM_TIME_REG);
 252
 253         if (state == IWL_MVM_TDLS_SW_IDLE)
 254                 mvm->tdls_cs.cur_sta_id = IWL_MVM_STATION_COUNT;
 255 }
 256
 257 void iwl_mvm_rx_tdls_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
 258 {
 259         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 260         struct iwl_tdls_channel_switch_notif *notif = (void *)pkt->data;
 261         struct ieee80211_sta *sta;
 262         unsigned int delay;
 263         struct iwl_mvm_sta *mvmsta;
 264         struct ieee80211_vif *vif;
 265         u32 sta_id = le32_to_cpu(notif->sta_id);
 266
 267         lockdep_assert_held(&mvm->mutex);
 268
 269         /* can fail sometimes */
 270         if (!le32_to_cpu(notif->status)) {
 271                 iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_IDLE);
 272                 return;
 273         }
 274
 275         if (WARN_ON(sta_id >= IWL_MVM_STATION_COUNT))
 276                 return;
 277
 278         sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[sta_id],
 279                                         lockdep_is_held(&mvm->mutex));
 280         /* the station may not be here, but if it is, it must be a TDLS peer */
 281         if (IS_ERR_OR_NULL(sta) || WARN_ON(!sta->tdls))
 282                 return;
 283
 284         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 285         vif = mvmsta->vif;
 286
 287         /*
 288          * Update state and possibly switch again after this is over (DTIM).
 289          * Also convert TU to msec.
 290          */
 291         delay = TU_TO_MS(vif->bss_conf.dtim_period * vif->bss_conf.beacon_int);
 292         mod_delayed_work(system_wq, &mvm->tdls_cs.dwork,
 293                          msecs_to_jiffies(delay));
 294
 295         iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_ACTIVE);
 296 }
 297
 298 static int
 299 iwl_mvm_tdls_check_action(struct iwl_mvm *mvm,
 300                           enum iwl_tdls_channel_switch_type type,
 301                           const u8 *peer, bool peer_initiator, u32 timestamp)
 302 {
 303         bool same_peer = false;
 304         int ret = 0;
 305
 306         /* get the existing peer if it's there */
 307         if (mvm->tdls_cs.state != IWL_MVM_TDLS_SW_IDLE &&
 308             mvm->tdls_cs.cur_sta_id != IWL_MVM_STATION_COUNT) {
 309                 struct ieee80211_sta *sta = rcu_dereference_protected(
 310                                 mvm->fw_id_to_mac_id[mvm->tdls_cs.cur_sta_id],
 311                                 lockdep_is_held(&mvm->mutex));
 312                 if (!IS_ERR_OR_NULL(sta))
 313                         same_peer = ether_addr_equal(peer, sta->addr);
 314         }
 315
 316         switch (mvm->tdls_cs.state) {
 317         case IWL_MVM_TDLS_SW_IDLE:
 318                 /*
 319                  * might be spurious packet from the peer after the switch is
 320                  * already done
 321                  */
 322                 if (type == TDLS_MOVE_CH)
 323                         ret = -EINVAL;
 324                 break;
 325         case IWL_MVM_TDLS_SW_REQ_SENT:
 326                 /* only allow requests from the same peer */
 327                 if (!same_peer)
 328                         ret = -EBUSY;
 329                 else if (type == TDLS_SEND_CHAN_SW_RESP_AND_MOVE_CH &&
 330                          !peer_initiator)
 331                         /*
 332                          * We received a ch-switch request while an outgoing
 333                          * one is pending. Allow it if the peer is the link
 334                          * initiator.
 335                          */
 336                         ret = -EBUSY;
 337                 else if (type == TDLS_SEND_CHAN_SW_REQ)
 338                         /* wait for idle before sending another request */
 339                         ret = -EBUSY;
 340                 else if (timestamp <= mvm->tdls_cs.peer.sent_timestamp)
 341                         /* we got a stale response - ignore it */
 342                         ret = -EINVAL;
 343                 break;
 344         case IWL_MVM_TDLS_SW_RESP_RCVD:
 345                 /*
 346                  * we are waiting for the FW to give an "active" notification,
 347                  * so ignore requests in the meantime
 348                  */
 349                 ret = -EBUSY;
 350                 break;
 351         case IWL_MVM_TDLS_SW_REQ_RCVD:
 352                 /* as above, allow the link initiator to proceed */
 353                 if (type == TDLS_SEND_CHAN_SW_REQ) {
 354                         if (!same_peer)
 355                                 ret = -EBUSY;
 356                         else if (peer_initiator) /* they are the initiator */
 357                                 ret = -EBUSY;
 358                 } else if (type == TDLS_MOVE_CH) {
 359                         ret = -EINVAL;
 360                 }
 361                 break;
 362         case IWL_MVM_TDLS_SW_ACTIVE:
 363                 /*
 364                  * the only valid request when active is a request to return
 365                  * to the base channel by the current off-channel peer
 366                  */
 367                 if (type != TDLS_MOVE_CH || !same_peer)
 368                         ret = -EBUSY;
 369                 break;
 370         }
 371
 372         if (ret)
 373                 IWL_DEBUG_TDLS(mvm,
 374                                "Invalid TDLS action %d state %d peer %pM same_peer %d initiator %d\n",
 375                                type, mvm->tdls_cs.state, peer, same_peer,
 376                                peer_initiator);
 377
 378         return ret;
 379 }
 380
 381 static int
 382 iwl_mvm_tdls_config_channel_switch(struct iwl_mvm *mvm,
 383                                    struct ieee80211_vif *vif,
 384                                    enum iwl_tdls_channel_switch_type type,
 385                                    const u8 *peer, bool peer_initiator,
 386                                    u8 oper_class,
 387                                    struct cfg80211_chan_def *chandef,
 388                                    u32 timestamp, u16 switch_time,
 389                                    u16 switch_timeout, struct sk_buff *skb,
 390                                    u32 ch_sw_tm_ie)
 391 {
 392         struct ieee80211_sta *sta;
 393         struct iwl_mvm_sta *mvmsta;
 394         struct ieee80211_tx_info *info;
 395         struct ieee80211_hdr *hdr;
 396         struct iwl_tdls_channel_switch_cmd cmd = {0};
 397         int ret;
 398
 399         lockdep_assert_held(&mvm->mutex);
 400
 401         ret = iwl_mvm_tdls_check_action(mvm, type, peer, peer_initiator,
 402                                         timestamp);
 403         if (ret)
 404                 return ret;
 405
 406         if (!skb || WARN_ON(skb->len > IWL_TDLS_CH_SW_FRAME_MAX_SIZE)) {
 407                 ret = -EINVAL;
 408                 goto out;
 409         }
 410
 411         cmd.switch_type = type;
 412         cmd.timing.frame_timestamp = cpu_to_le32(timestamp);
 413         cmd.timing.switch_time = cpu_to_le32(switch_time);
 414         cmd.timing.switch_timeout = cpu_to_le32(switch_timeout);
 415
 416         rcu_read_lock();
 417         sta = ieee80211_find_sta(vif, peer);
 418         if (!sta) {
 419                 rcu_read_unlock();
 420                 ret = -ENOENT;
 421                 goto out;
 422         }
 423         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 424         cmd.peer_sta_id = cpu_to_le32(mvmsta->sta_id);
 425
 426         if (!chandef) {
 427                 if (mvm->tdls_cs.state == IWL_MVM_TDLS_SW_REQ_SENT &&
 428                     mvm->tdls_cs.peer.chandef.chan) {
 429                         /* actually moving to the channel */
 430                         chandef = &mvm->tdls_cs.peer.chandef;
 431                 } else if (mvm->tdls_cs.state == IWL_MVM_TDLS_SW_ACTIVE &&
 432                            type == TDLS_MOVE_CH) {
 433                         /* we need to return to base channel */
 434                         struct ieee80211_chanctx_conf *chanctx =
 435                                         rcu_dereference(vif->chanctx_conf);
 436
 437                         if (WARN_ON_ONCE(!chanctx)) {
 438                                 rcu_read_unlock();
 439                                 goto out;
 440                         }
 441
 442                         chandef = &chanctx->def;
 443                 }
 444         }
 445
 446         if (chandef) {
 447                 cmd.ci.band = (chandef->chan->band == NL80211_BAND_2GHZ ?
 448                                PHY_BAND_24 : PHY_BAND_5);
 449                 cmd.ci.channel = chandef->chan->hw_value;
 450                 cmd.ci.width = iwl_mvm_get_channel_width(chandef);
 451                 cmd.ci.ctrl_pos = iwl_mvm_get_ctrl_pos(chandef);
 452         }
 453
 454         /* keep quota calculation simple for now - 50% of DTIM for TDLS */
 455         cmd.timing.max_offchan_duration =
 456                         cpu_to_le32(TU_TO_US(vif->bss_conf.dtim_period *
 457                                              vif->bss_conf.beacon_int) / 2);
 458
 459         /* Switch time is the first element in the switch-timing IE. */
 460         cmd.frame.switch_time_offset = cpu_to_le32(ch_sw_tm_ie + 2);
 461
 462         info = IEEE80211_SKB_CB(skb);
 463         hdr = (void *)skb->data;
 464         if (info->control.hw_key) {
 465                 if (info->control.hw_key->cipher != WLAN_CIPHER_SUITE_CCMP) {
 466                         rcu_read_unlock();
 467                         ret = -EINVAL;
 468                         goto out;
 469                 }
 470                 iwl_mvm_set_tx_cmd_ccmp(info, &cmd.frame.tx_cmd);
 471         }
 472
 473         iwl_mvm_set_tx_cmd(mvm, skb, &cmd.frame.tx_cmd, info,
 474                            mvmsta->sta_id);
 475
 476         iwl_mvm_set_tx_cmd_rate(mvm, &cmd.frame.tx_cmd, info, sta,
 477                                 hdr->frame_control);
 478         rcu_read_unlock();
 479
 480         memcpy(cmd.frame.data, skb->data, skb->len);
 481
 482         ret = iwl_mvm_send_cmd_pdu(mvm, TDLS_CHANNEL_SWITCH_CMD, 0,
 483                                    sizeof(cmd), &cmd);
 484         if (ret) {
 485                 IWL_ERR(mvm, "Failed to send TDLS_CHANNEL_SWITCH cmd: %d\n",
 486                         ret);
 487                 goto out;
 488         }
 489
 490         /* channel switch has started, update state */
 491         if (type != TDLS_MOVE_CH) {
 492                 mvm->tdls_cs.cur_sta_id = mvmsta->sta_id;
 493                 iwl_mvm_tdls_update_cs_state(mvm,
 494                                              type == TDLS_SEND_CHAN_SW_REQ ?
 495                                              IWL_MVM_TDLS_SW_REQ_SENT :
 496                                              IWL_MVM_TDLS_SW_REQ_RCVD);
 497         } else {
 498                 iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_RESP_RCVD);
 499         }
 500
 501 out:
 502
 503         /* channel switch failed - we are idle */
 504         if (ret)
 505                 iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_IDLE);
 506
 507         return ret;
 508 }
 509
 510 void iwl_mvm_tdls_ch_switch_work(struct work_struct *work)
 511 {
 512         struct iwl_mvm *mvm;
 513         struct ieee80211_sta *sta;
 514         struct iwl_mvm_sta *mvmsta;
 515         struct ieee80211_vif *vif;
 516         unsigned int delay;
 517         int ret;
 518
 519         mvm = container_of(work, struct iwl_mvm, tdls_cs.dwork.work);
 520         mutex_lock(&mvm->mutex);
 521
 522         /* called after an active channel switch has finished or timed-out */
 523         iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_IDLE);
 524
 525         /* station might be gone, in that case do nothing */
 526         if (mvm->tdls_cs.peer.sta_id == IWL_MVM_STATION_COUNT)
 527                 goto out;
 528
 529         sta = rcu_dereference_protected(
 530                                 mvm->fw_id_to_mac_id[mvm->tdls_cs.peer.sta_id],
 531                                 lockdep_is_held(&mvm->mutex));
 532         /* the station may not be here, but if it is, it must be a TDLS peer */
 533         if (!sta || IS_ERR(sta) || WARN_ON(!sta->tdls))
 534                 goto out;
 535
 536         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 537         vif = mvmsta->vif;
 538         ret = iwl_mvm_tdls_config_channel_switch(mvm, vif,
 539                                                  TDLS_SEND_CHAN_SW_REQ,
 540                                                  sta->addr,
 541                                                  mvm->tdls_cs.peer.initiator,
 542                                                  mvm->tdls_cs.peer.op_class,
 543                                                  &mvm->tdls_cs.peer.chandef,
 544                                                  0, 0, 0,
 545                                                  mvm->tdls_cs.peer.skb,
 546                                                  mvm->tdls_cs.peer.ch_sw_tm_ie);
 547         if (ret)
 548                 IWL_ERR(mvm, "Not sending TDLS channel switch: %d\n", ret);
 549
 550         /* retry after a DTIM if we failed sending now */
 551         delay = TU_TO_MS(vif->bss_conf.dtim_period * vif->bss_conf.beacon_int);
 552         queue_delayed_work(system_wq, &mvm->tdls_cs.dwork,
 553                            msecs_to_jiffies(delay));
 554 out:
 555         mutex_unlock(&mvm->mutex);
 556 }
 557
 558 int
 559 iwl_mvm_tdls_channel_switch(struct ieee80211_hw *hw,
 560                             struct ieee80211_vif *vif,
 561                             struct ieee80211_sta *sta, u8 oper_class,
 562                             struct cfg80211_chan_def *chandef,
 563                             struct sk_buff *tmpl_skb, u32 ch_sw_tm_ie)
 564 {
 565         struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
 566         struct iwl_mvm_sta *mvmsta;
 567         unsigned int delay;
 568         int ret;
 569
 570         mutex_lock(&mvm->mutex);
 571
 572         IWL_DEBUG_TDLS(mvm, "TDLS channel switch with %pM ch %d width %d\n",
 573                        sta->addr, chandef->chan->center_freq, chandef->width);
 574
 575         /* we only support a single peer for channel switching */
 576         if (mvm->tdls_cs.peer.sta_id != IWL_MVM_STATION_COUNT) {
 577                 IWL_DEBUG_TDLS(mvm,
 578                                "Existing peer. Can't start switch with %pM\n",
 579                                sta->addr);
 580                 ret = -EBUSY;
 581                 goto out;
 582         }
 583
 584         ret = iwl_mvm_tdls_config_channel_switch(mvm, vif,
 585                                                  TDLS_SEND_CHAN_SW_REQ,
 586                                                  sta->addr, sta->tdls_initiator,
 587                                                  oper_class, chandef, 0, 0, 0,
 588                                                  tmpl_skb, ch_sw_tm_ie);
 589         if (ret)
 590                 goto out;
 591
 592         /*
 593          * Mark the peer as "in tdls switch" for this vif. We only allow a
 594          * single such peer per vif.
 595          */
 596         mvm->tdls_cs.peer.skb = skb_copy(tmpl_skb, GFP_KERNEL);
 597         if (!mvm->tdls_cs.peer.skb) {
 598                 ret = -ENOMEM;
 599                 goto out;
 600         }
 601
 602         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 603         mvm->tdls_cs.peer.sta_id = mvmsta->sta_id;
 604         mvm->tdls_cs.peer.chandef = *chandef;
 605         mvm->tdls_cs.peer.initiator = sta->tdls_initiator;
 606         mvm->tdls_cs.peer.op_class = oper_class;
 607         mvm->tdls_cs.peer.ch_sw_tm_ie = ch_sw_tm_ie;
 608
 609         /*
 610          * Wait for 2 DTIM periods before attempting the next switch. The next
 611          * switch will be made sooner if the current one completes before that.
 612          */
 613         delay = 2 * TU_TO_MS(vif->bss_conf.dtim_period *
 614                              vif->bss_conf.beacon_int);
 615         mod_delayed_work(system_wq, &mvm->tdls_cs.dwork,
 616                          msecs_to_jiffies(delay));
 617
 618 out:
 619         mutex_unlock(&mvm->mutex);
 620         return ret;
 621 }
 622
 623 void iwl_mvm_tdls_cancel_channel_switch(struct ieee80211_hw *hw,
 624                                         struct ieee80211_vif *vif,
 625                                         struct ieee80211_sta *sta)
 626 {
 627         struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
 628         struct ieee80211_sta *cur_sta;
 629         bool wait_for_phy = false;
 630
 631         mutex_lock(&mvm->mutex);
 632
 633         IWL_DEBUG_TDLS(mvm, "TDLS cancel channel switch with %pM\n", sta->addr);
 634
 635         /* we only support a single peer for channel switching */
 636         if (mvm->tdls_cs.peer.sta_id == IWL_MVM_STATION_COUNT) {
 637                 IWL_DEBUG_TDLS(mvm, "No ch switch peer - %pM\n", sta->addr);
 638                 goto out;
 639         }
 640
 641         cur_sta = rcu_dereference_protected(
 642                                 mvm->fw_id_to_mac_id[mvm->tdls_cs.peer.sta_id],
 643                                 lockdep_is_held(&mvm->mutex));
 644         /* make sure it's the same peer */
 645         if (cur_sta != sta)
 646                 goto out;
 647
 648         /*
 649          * If we're currently in a switch because of the now canceled peer,
 650          * wait a DTIM here to make sure the phy is back on the base channel.
 651          * We can't otherwise force it.
 652          */
 653         if (mvm->tdls_cs.cur_sta_id == mvm->tdls_cs.peer.sta_id &&
 654             mvm->tdls_cs.state != IWL_MVM_TDLS_SW_IDLE)
 655                 wait_for_phy = true;
 656
 657         mvm->tdls_cs.peer.sta_id = IWL_MVM_STATION_COUNT;
 658         dev_kfree_skb(mvm->tdls_cs.peer.skb);
 659         mvm->tdls_cs.peer.skb = NULL;
 660
 661 out:
 662         mutex_unlock(&mvm->mutex);
 663
 664         /* make sure the phy is on the base channel */
 665         if (wait_for_phy)
 666                 msleep(TU_TO_MS(vif->bss_conf.dtim_period *
 667                                 vif->bss_conf.beacon_int));
 668
 669         /* flush the channel switch state */
 670         flush_delayed_work(&mvm->tdls_cs.dwork);
 671
 672         IWL_DEBUG_TDLS(mvm, "TDLS ending channel switch with %pM\n", sta->addr);
 673 }
 674
 675 void
 676 iwl_mvm_tdls_recv_channel_switch(struct ieee80211_hw *hw,
 677                                  struct ieee80211_vif *vif,
 678                                  struct ieee80211_tdls_ch_sw_params *params)
 679 {
 680         struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
 681         enum iwl_tdls_channel_switch_type type;
 682         unsigned int delay;
 683         const char *action_str =
 684                 params->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ?
 685                 "REQ" : "RESP";
 686
 687         mutex_lock(&mvm->mutex);
 688
 689         IWL_DEBUG_TDLS(mvm,
 690                        "Received TDLS ch switch action %s from %pM status %d\n",
 691                        action_str, params->sta->addr, params->status);
 692
 693         /*
 694          * we got a non-zero status from a peer we were switching to - move to
 695          * the idle state and retry again later
 696          */
 697         if (params->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE &&
 698             params->status != 0 &&
 699             mvm->tdls_cs.state == IWL_MVM_TDLS_SW_REQ_SENT &&
 700             mvm->tdls_cs.cur_sta_id != IWL_MVM_STATION_COUNT) {
 701                 struct ieee80211_sta *cur_sta;
 702
 703                 /* make sure it's the same peer */
 704                 cur_sta = rcu_dereference_protected(
 705                                 mvm->fw_id_to_mac_id[mvm->tdls_cs.cur_sta_id],
 706                                 lockdep_is_held(&mvm->mutex));
 707                 if (cur_sta == params->sta) {
 708                         iwl_mvm_tdls_update_cs_state(mvm,
 709                                                      IWL_MVM_TDLS_SW_IDLE);
 710                         goto retry;
 711                 }
 712         }
 713
 714         type = (params->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST) ?
 715                TDLS_SEND_CHAN_SW_RESP_AND_MOVE_CH : TDLS_MOVE_CH;
 716
 717         iwl_mvm_tdls_config_channel_switch(mvm, vif, type, params->sta->addr,
 718                                            params->sta->tdls_initiator, 0,
 719                                            params->chandef, params->timestamp,
 720                                            params->switch_time,
 721                                            params->switch_timeout,
 722                                            params->tmpl_skb,
 723                                            params->ch_sw_tm_ie);
 724
 725 retry:
 726         /* register a timeout in case we don't succeed in switching */
 727         delay = vif->bss_conf.dtim_period * vif->bss_conf.beacon_int *
 728                 1024 / 1000;
 729         mod_delayed_work(system_wq, &mvm->tdls_cs.dwork,
 730                          msecs_to_jiffies(delay));
 731         mutex_unlock(&mvm->mutex);
 732 }