drivers/net/wireless/intel/iwlwifi/mvm/mld-sta.c

   1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
   2 /*
   3  * Copyright (C) 2022-2023 Intel Corporation
   4  */
   5 #include "mvm.h"
   6 #include "time-sync.h"
   7 #include "sta.h"
   8
   9 u32 iwl_mvm_sta_fw_id_mask(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
  10                            int filter_link_id)
  11 {
  12         struct iwl_mvm_sta *mvmsta;
  13         unsigned int link_id;
  14         u32 result = 0;
  15
  16         if (!sta)
  17                 return 0;
  18
  19         mvmsta = iwl_mvm_sta_from_mac80211(sta);
  20
  21         /* it's easy when the STA is not an MLD */
  22         if (!sta->valid_links)
  23                 return BIT(mvmsta->deflink.sta_id);
  24
  25         /* but if it is an MLD, get the mask of all the FW STAs it has ... */
  26         for (link_id = 0; link_id < ARRAY_SIZE(mvmsta->link); link_id++) {
  27                 struct iwl_mvm_link_sta *link_sta;
  28
  29                 /* unless we have a specific link in mind */
  30                 if (filter_link_id >= 0 && link_id != filter_link_id)
  31                         continue;
  32
  33                 link_sta =
  34                         rcu_dereference_check(mvmsta->link[link_id],
  35                                               lockdep_is_held(&mvm->mutex));
  36                 if (!link_sta)
  37                         continue;
  38
  39                 result |= BIT(link_sta->sta_id);
  40         }
  41
  42         return result;
  43 }
  44
  45 static int iwl_mvm_mld_send_sta_cmd(struct iwl_mvm *mvm,
  46                                     struct iwl_mvm_sta_cfg_cmd *cmd)
  47 {
  48         int ret = iwl_mvm_send_cmd_pdu(mvm,
  49                                        WIDE_ID(MAC_CONF_GROUP, STA_CONFIG_CMD),
  50                                        0, sizeof(*cmd), cmd);
  51         if (ret)
  52                 IWL_ERR(mvm, "STA_CONFIG_CMD send failed, ret=0x%x\n", ret);
  53         return ret;
  54 }
  55
  56 /*
  57  * Add an internal station to the FW table
  58  */
  59 static int iwl_mvm_mld_add_int_sta_to_fw(struct iwl_mvm *mvm,
  60                                          struct iwl_mvm_int_sta *sta,
  61                                          const u8 *addr, int link_id)
  62 {
  63         struct iwl_mvm_sta_cfg_cmd cmd;
  64
  65         lockdep_assert_held(&mvm->mutex);
  66
  67         memset(&cmd, 0, sizeof(cmd));
  68         cmd.sta_id = cpu_to_le32((u8)sta->sta_id);
  69
  70         cmd.link_id = cpu_to_le32(link_id);
  71
  72         cmd.station_type = cpu_to_le32(sta->type);
  73
  74         if (fw_has_capa(&mvm->fw->ucode_capa,
  75                         IWL_UCODE_TLV_CAPA_STA_EXP_MFP_SUPPORT) &&
  76             sta->type == STATION_TYPE_BCAST_MGMT)
  77                 cmd.mfp = cpu_to_le32(1);
  78
  79         if (addr) {
  80                 memcpy(cmd.peer_mld_address, addr, ETH_ALEN);
  81                 memcpy(cmd.peer_link_address, addr, ETH_ALEN);
  82         }
  83
  84         return iwl_mvm_mld_send_sta_cmd(mvm, &cmd);
  85 }
  86
  87 /*
  88  * Remove a station from the FW table. Before sending the command to remove
  89  * the station validate that the station is indeed known to the driver (sanity
  90  * only).
  91  */
  92 static int iwl_mvm_mld_rm_sta_from_fw(struct iwl_mvm *mvm, u32 sta_id)
  93 {
  94         struct iwl_mvm_remove_sta_cmd rm_sta_cmd = {
  95                 .sta_id = cpu_to_le32(sta_id),
  96         };
  97         int ret;
  98
  99         /* Note: internal stations are marked as error values */
 100         if (!rcu_access_pointer(mvm->fw_id_to_mac_id[sta_id])) {
 101                 IWL_ERR(mvm, "Invalid station id %d\n", sta_id);
 102                 return -EINVAL;
 103         }
 104
 105         ret = iwl_mvm_send_cmd_pdu(mvm, WIDE_ID(MAC_CONF_GROUP, STA_REMOVE_CMD),
 106                                    0, sizeof(rm_sta_cmd), &rm_sta_cmd);
 107         if (ret) {
 108                 IWL_ERR(mvm, "Failed to remove station. Id=%d\n", sta_id);
 109                 return ret;
 110         }
 111
 112         return 0;
 113 }
 114
 115 static int iwl_mvm_add_aux_sta_to_fw(struct iwl_mvm *mvm,
 116                                      struct iwl_mvm_int_sta *sta,
 117                                      u32 lmac_id)
 118 {
 119         int ret;
 120
 121         struct iwl_mvm_aux_sta_cmd cmd = {
 122                 .sta_id = cpu_to_le32(sta->sta_id),
 123                 .lmac_id = cpu_to_le32(lmac_id),
 124         };
 125
 126         ret = iwl_mvm_send_cmd_pdu(mvm, WIDE_ID(MAC_CONF_GROUP, AUX_STA_CMD),
 127                                    0, sizeof(cmd), &cmd);
 128         if (ret)
 129                 IWL_ERR(mvm, "Failed to send AUX_STA_CMD\n");
 130         return ret;
 131 }
 132
 133 /*
 134  * Adds an internal sta to the FW table with its queues
 135  */
 136 int iwl_mvm_mld_add_int_sta_with_queue(struct iwl_mvm *mvm,
 137                                        struct iwl_mvm_int_sta *sta,
 138                                        const u8 *addr, int link_id,
 139                                        u16 *queue, u8 tid,
 140                                        unsigned int *_wdg_timeout)
 141 {
 142         int ret, txq;
 143         unsigned int wdg_timeout = _wdg_timeout ? *_wdg_timeout :
 144                 mvm->trans->trans_cfg->base_params->wd_timeout;
 145
 146         if (WARN_ON_ONCE(sta->sta_id == IWL_MVM_INVALID_STA))
 147                 return -ENOSPC;
 148
 149         if (sta->type == STATION_TYPE_AUX)
 150                 ret = iwl_mvm_add_aux_sta_to_fw(mvm, sta, link_id);
 151         else
 152                 ret = iwl_mvm_mld_add_int_sta_to_fw(mvm, sta, addr, link_id);
 153         if (ret)
 154                 return ret;
 155
 156         /*
 157          * For 22000 firmware and on we cannot add queue to a station unknown
 158          * to firmware so enable queue here - after the station was added
 159          */
 160         txq = iwl_mvm_tvqm_enable_txq(mvm, NULL, sta->sta_id, tid,
 161                                       wdg_timeout);
 162         if (txq < 0) {
 163                 iwl_mvm_mld_rm_sta_from_fw(mvm, sta->sta_id);
 164                 return txq;
 165         }
 166         *queue = txq;
 167
 168         return 0;
 169 }
 170
 171 /*
 172  * Adds a new int sta: allocate it in the driver, add it to the FW table,
 173  * and add its queues.
 174  */
 175 static int iwl_mvm_mld_add_int_sta(struct iwl_mvm *mvm,
 176                                    struct iwl_mvm_int_sta *int_sta, u16 *queue,
 177                                    enum nl80211_iftype iftype,
 178                                    enum iwl_fw_sta_type sta_type,
 179                                    int link_id, const u8 *addr, u8 tid,
 180                                    unsigned int *wdg_timeout)
 181 {
 182         int ret;
 183
 184         lockdep_assert_held(&mvm->mutex);
 185
 186         /* qmask argument is not used in the new tx api, send a don't care */
 187         ret = iwl_mvm_allocate_int_sta(mvm, int_sta, 0, iftype,
 188                                        sta_type);
 189         if (ret)
 190                 return ret;
 191
 192         ret = iwl_mvm_mld_add_int_sta_with_queue(mvm, int_sta, addr, link_id,
 193                                                  queue, tid, wdg_timeout);
 194         if (ret) {
 195                 iwl_mvm_dealloc_int_sta(mvm, int_sta);
 196                 return ret;
 197         }
 198
 199         return 0;
 200 }
 201
 202 /* Allocate a new station entry for the broadcast station to the given vif,
 203  * and send it to the FW.
 204  * Note that each P2P mac should have its own broadcast station.
 205  */
 206 int iwl_mvm_mld_add_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 207                               struct ieee80211_bss_conf *link_conf)
 208 {
 209         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 210         struct iwl_mvm_vif_link_info *mvm_link =
 211                 mvmvif->link[link_conf->link_id];
 212         struct iwl_mvm_int_sta *bsta = &mvm_link->bcast_sta;
 213         static const u8 _baddr[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
 214         const u8 *baddr = _baddr;
 215         unsigned int wdg_timeout =
 216                 iwl_mvm_get_wd_timeout(mvm, vif, false, false);
 217         u16 *queue;
 218
 219         lockdep_assert_held(&mvm->mutex);
 220
 221         if (vif->type == NL80211_IFTYPE_ADHOC)
 222                 baddr = link_conf->bssid;
 223
 224         if (vif->type == NL80211_IFTYPE_AP ||
 225             vif->type == NL80211_IFTYPE_ADHOC) {
 226                 queue = &mvm_link->mgmt_queue;
 227         } else if (vif->type == NL80211_IFTYPE_P2P_DEVICE) {
 228                 queue = &mvm->p2p_dev_queue;
 229         } else {
 230                 WARN(1, "Missing required TXQ for adding bcast STA\n");
 231                 return -EINVAL;
 232         }
 233
 234         return iwl_mvm_mld_add_int_sta(mvm, bsta, queue,
 235                                        ieee80211_vif_type_p2p(vif),
 236                                        STATION_TYPE_BCAST_MGMT,
 237                                        mvm_link->fw_link_id, baddr,
 238                                        IWL_MAX_TID_COUNT, &wdg_timeout);
 239 }
 240
 241 /* Allocate a new station entry for the broadcast station to the given vif,
 242  * and send it to the FW.
 243  * Note that each AP/GO mac should have its own multicast station.
 244  */
 245 int iwl_mvm_mld_add_mcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 246                               struct ieee80211_bss_conf *link_conf)
 247 {
 248         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 249         struct iwl_mvm_vif_link_info *mvm_link =
 250                 mvmvif->link[link_conf->link_id];
 251         struct iwl_mvm_int_sta *msta = &mvm_link->mcast_sta;
 252         static const u8 _maddr[] = {0x03, 0x00, 0x00, 0x00, 0x00, 0x00};
 253         const u8 *maddr = _maddr;
 254         unsigned int timeout = iwl_mvm_get_wd_timeout(mvm, vif, false, false);
 255
 256         lockdep_assert_held(&mvm->mutex);
 257
 258         if (WARN_ON(vif->type != NL80211_IFTYPE_AP &&
 259                     vif->type != NL80211_IFTYPE_ADHOC))
 260                 return -EOPNOTSUPP;
 261
 262         /* In IBSS, ieee80211_check_queues() sets the cab_queue to be
 263          * invalid, so make sure we use the queue we want.
 264          * Note that this is done here as we want to avoid making DQA
 265          * changes in mac80211 layer.
 266          */
 267         if (vif->type == NL80211_IFTYPE_ADHOC)
 268                 mvm_link->cab_queue = IWL_MVM_DQA_GCAST_QUEUE;
 269
 270         return iwl_mvm_mld_add_int_sta(mvm, msta, &mvm_link->cab_queue,
 271                                        vif->type, STATION_TYPE_MCAST,
 272                                        mvm_link->fw_link_id, maddr, 0,
 273                                        &timeout);
 274 }
 275
 276 /* Allocate a new station entry for the sniffer station to the given vif,
 277  * and send it to the FW.
 278  */
 279 int iwl_mvm_mld_add_snif_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 280                              struct ieee80211_bss_conf *link_conf)
 281 {
 282         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 283         struct iwl_mvm_vif_link_info *mvm_link =
 284                 mvmvif->link[link_conf->link_id];
 285
 286         lockdep_assert_held(&mvm->mutex);
 287
 288         return iwl_mvm_mld_add_int_sta(mvm, &mvm->snif_sta, &mvm->snif_queue,
 289                                        vif->type, STATION_TYPE_BCAST_MGMT,
 290                                        mvm_link->fw_link_id, NULL,
 291                                        IWL_MAX_TID_COUNT, NULL);
 292 }
 293
 294 int iwl_mvm_mld_add_aux_sta(struct iwl_mvm *mvm, u32 lmac_id)
 295 {
 296         lockdep_assert_held(&mvm->mutex);
 297
 298         /* In CDB NICs we need to specify which lmac to use for aux activity;
 299          * use the link_id argument place to send lmac_id to the function.
 300          */
 301         return iwl_mvm_mld_add_int_sta(mvm, &mvm->aux_sta, &mvm->aux_queue,
 302                                        NL80211_IFTYPE_UNSPECIFIED,
 303                                        STATION_TYPE_AUX, lmac_id, NULL,
 304                                        IWL_MAX_TID_COUNT, NULL);
 305 }
 306
 307 static int iwl_mvm_mld_disable_txq(struct iwl_mvm *mvm, u32 sta_mask,
 308                                    u16 *queueptr, u8 tid)
 309 {
 310         int queue = *queueptr;
 311         int ret = 0;
 312
 313         if (tid == IWL_MAX_TID_COUNT)
 314                 tid = IWL_MGMT_TID;
 315
 316         if (mvm->sta_remove_requires_queue_remove) {
 317                 u32 cmd_id = WIDE_ID(DATA_PATH_GROUP,
 318                                      SCD_QUEUE_CONFIG_CMD);
 319                 struct iwl_scd_queue_cfg_cmd remove_cmd = {
 320                         .operation = cpu_to_le32(IWL_SCD_QUEUE_REMOVE),
 321                         .u.remove.tid = cpu_to_le32(tid),
 322                         .u.remove.sta_mask = cpu_to_le32(sta_mask),
 323                 };
 324
 325                 ret = iwl_mvm_send_cmd_pdu(mvm, cmd_id, 0,
 326                                            sizeof(remove_cmd),
 327                                            &remove_cmd);
 328         }
 329
 330         iwl_trans_txq_free(mvm->trans, queue);
 331         *queueptr = IWL_MVM_INVALID_QUEUE;
 332
 333         return ret;
 334 }
 335
 336 /* Removes a sta from the FW table, disable its queues, and dealloc it
 337  */
 338 static int iwl_mvm_mld_rm_int_sta(struct iwl_mvm *mvm,
 339                                   struct iwl_mvm_int_sta *int_sta,
 340                                   bool flush, u8 tid, u16 *queuptr)
 341 {
 342         int ret;
 343
 344         lockdep_assert_held(&mvm->mutex);
 345
 346         if (WARN_ON_ONCE(int_sta->sta_id == IWL_MVM_INVALID_STA))
 347                 return -EINVAL;
 348
 349         if (flush)
 350                 iwl_mvm_flush_sta(mvm, int_sta->sta_id, int_sta->tfd_queue_msk);
 351
 352         iwl_mvm_mld_disable_txq(mvm, BIT(int_sta->sta_id), queuptr, tid);
 353
 354         ret = iwl_mvm_mld_rm_sta_from_fw(mvm, int_sta->sta_id);
 355         if (ret)
 356                 IWL_WARN(mvm, "Failed sending remove station\n");
 357
 358         iwl_mvm_dealloc_int_sta(mvm, int_sta);
 359
 360         return ret;
 361 }
 362
 363 int iwl_mvm_mld_rm_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 364                              struct ieee80211_bss_conf *link_conf)
 365 {
 366         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 367         struct iwl_mvm_vif_link_info *link = mvmvif->link[link_conf->link_id];
 368         u16 *queueptr;
 369
 370         lockdep_assert_held(&mvm->mutex);
 371
 372         if (WARN_ON(!link))
 373                 return -EIO;
 374
 375         switch (vif->type) {
 376         case NL80211_IFTYPE_AP:
 377         case NL80211_IFTYPE_ADHOC:
 378                 queueptr = &link->mgmt_queue;
 379                 break;
 380         case NL80211_IFTYPE_P2P_DEVICE:
 381                 queueptr = &mvm->p2p_dev_queue;
 382                 break;
 383         default:
 384                 WARN(1, "Can't free bcast queue on vif type %d\n",
 385                      vif->type);
 386                 return -EINVAL;
 387         }
 388
 389         return iwl_mvm_mld_rm_int_sta(mvm, &link->bcast_sta,
 390                                       true, IWL_MAX_TID_COUNT, queueptr);
 391 }
 392
 393 /* Send the FW a request to remove the station from it's internal data
 394  * structures, and in addition remove it from the local data structure.
 395  */
 396 int iwl_mvm_mld_rm_mcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 397                              struct ieee80211_bss_conf *link_conf)
 398 {
 399         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 400         struct iwl_mvm_vif_link_info *link = mvmvif->link[link_conf->link_id];
 401
 402         lockdep_assert_held(&mvm->mutex);
 403
 404         if (WARN_ON(!link))
 405                 return -EIO;
 406
 407         return iwl_mvm_mld_rm_int_sta(mvm, &link->mcast_sta, true, 0,
 408                                       &link->cab_queue);
 409 }
 410
 411 int iwl_mvm_mld_rm_snif_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
 412 {
 413         lockdep_assert_held(&mvm->mutex);
 414
 415         return iwl_mvm_mld_rm_int_sta(mvm, &mvm->snif_sta, false,
 416                                       IWL_MAX_TID_COUNT, &mvm->snif_queue);
 417 }
 418
 419 int iwl_mvm_mld_rm_aux_sta(struct iwl_mvm *mvm)
 420 {
 421         lockdep_assert_held(&mvm->mutex);
 422
 423         return iwl_mvm_mld_rm_int_sta(mvm, &mvm->aux_sta, false,
 424                                       IWL_MAX_TID_COUNT, &mvm->aux_queue);
 425 }
 426
 427 /* send a cfg sta command to add/update a sta in firmware */
 428 static int iwl_mvm_mld_cfg_sta(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 429                                struct ieee80211_vif *vif,
 430                                struct ieee80211_link_sta *link_sta,
 431                                struct ieee80211_bss_conf *link_conf,
 432                                struct iwl_mvm_link_sta *mvm_link_sta)
 433 {
 434         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
 435         struct iwl_mvm_vif *mvm_vif = iwl_mvm_vif_from_mac80211(vif);
 436         struct iwl_mvm_vif_link_info *link_info =
 437                                         mvm_vif->link[link_conf->link_id];
 438         struct iwl_mvm_sta_cfg_cmd cmd = {
 439                 .sta_id = cpu_to_le32(mvm_link_sta->sta_id),
 440                 .station_type = cpu_to_le32(mvm_sta->sta_type),
 441         };
 442         u32 agg_size = 0, mpdu_dens = 0;
 443
 444         /* when adding sta, link should exist in FW */
 445         if (WARN_ON(link_info->fw_link_id == IWL_MVM_FW_LINK_ID_INVALID))
 446                 return -EINVAL;
 447
 448         cmd.link_id = cpu_to_le32(link_info->fw_link_id);
 449
 450         memcpy(&cmd.peer_mld_address, sta->addr, ETH_ALEN);
 451         memcpy(&cmd.peer_link_address, link_sta->addr, ETH_ALEN);
 452
 453         if (mvm_sta->sta_state >= IEEE80211_STA_ASSOC)
 454                 cmd.assoc_id = cpu_to_le32(sta->aid);
 455
 456         if (fw_has_capa(&mvm->fw->ucode_capa,
 457                         IWL_UCODE_TLV_CAPA_STA_EXP_MFP_SUPPORT) &&
 458             (sta->mfp || mvm_sta->sta_state < IEEE80211_STA_AUTHORIZED))
 459                 cmd.mfp = cpu_to_le32(1);
 460
 461         switch (link_sta->rx_nss) {
 462         case 1:
 463                 cmd.mimo = cpu_to_le32(0);
 464                 break;
 465         case 2 ... 8:
 466                 cmd.mimo = cpu_to_le32(1);
 467                 break;
 468         }
 469
 470         switch (sta->deflink.smps_mode) {
 471         case IEEE80211_SMPS_AUTOMATIC:
 472         case IEEE80211_SMPS_NUM_MODES:
 473                 WARN_ON(1);
 474                 break;
 475         case IEEE80211_SMPS_STATIC:
 476                 /* override NSS */
 477                 cmd.mimo = cpu_to_le32(0);
 478                 break;
 479         case IEEE80211_SMPS_DYNAMIC:
 480                 cmd.mimo_protection = cpu_to_le32(1);
 481                 break;
 482         case IEEE80211_SMPS_OFF:
 483                 /* nothing */
 484                 break;
 485         }
 486
 487         mpdu_dens = iwl_mvm_get_sta_ampdu_dens(link_sta, link_conf, &agg_size);
 488         cmd.tx_ampdu_spacing = cpu_to_le32(mpdu_dens);
 489         cmd.tx_ampdu_max_size = cpu_to_le32(agg_size);
 490
 491         if (sta->wme) {
 492                 cmd.sp_length =
 493                         cpu_to_le32(sta->max_sp ? sta->max_sp * 2 : 128);
 494                 cmd.uapsd_acs = cpu_to_le32(iwl_mvm_get_sta_uapsd_acs(sta));
 495         }
 496
 497         if (link_sta->he_cap.has_he) {
 498                 cmd.trig_rnd_alloc =
 499                         cpu_to_le32(link_conf->uora_exists ? 1 : 0);
 500
 501                 /* PPE Thresholds */
 502                 iwl_mvm_set_sta_pkt_ext(mvm, link_sta, &cmd.pkt_ext);
 503
 504                 /* HTC flags */
 505                 cmd.htc_flags = iwl_mvm_get_sta_htc_flags(sta, link_sta);
 506
 507                 if (link_sta->he_cap.he_cap_elem.mac_cap_info[2] &
 508                     IEEE80211_HE_MAC_CAP2_ACK_EN)
 509                         cmd.ack_enabled = cpu_to_le32(1);
 510         }
 511
 512         return iwl_mvm_mld_send_sta_cmd(mvm, &cmd);
 513 }
 514
 515 static void iwl_mvm_mld_free_sta_link(struct iwl_mvm *mvm,
 516                                       struct iwl_mvm_sta *mvm_sta,
 517                                       struct iwl_mvm_link_sta *mvm_sta_link,
 518                                       unsigned int link_id,
 519                                       bool is_in_fw)
 520 {
 521         RCU_INIT_POINTER(mvm->fw_id_to_mac_id[mvm_sta_link->sta_id],
 522                          is_in_fw ? ERR_PTR(-EINVAL) : NULL);
 523         RCU_INIT_POINTER(mvm->fw_id_to_link_sta[mvm_sta_link->sta_id], NULL);
 524         RCU_INIT_POINTER(mvm_sta->link[link_id], NULL);
 525
 526         if (mvm_sta_link != &mvm_sta->deflink)
 527                 kfree_rcu(mvm_sta_link, rcu_head);
 528 }
 529
 530 static void iwl_mvm_mld_sta_rm_all_sta_links(struct iwl_mvm *mvm,
 531                                              struct iwl_mvm_sta *mvm_sta)
 532 {
 533         unsigned int link_id;
 534
 535         for (link_id = 0; link_id < ARRAY_SIZE(mvm_sta->link); link_id++) {
 536                 struct iwl_mvm_link_sta *link =
 537                         rcu_dereference_protected(mvm_sta->link[link_id],
 538                                                   lockdep_is_held(&mvm->mutex));
 539
 540                 if (!link)
 541                         continue;
 542
 543                 iwl_mvm_mld_free_sta_link(mvm, mvm_sta, link, link_id, false);
 544         }
 545 }
 546
 547 static int iwl_mvm_mld_alloc_sta_link(struct iwl_mvm *mvm,
 548                                       struct ieee80211_vif *vif,
 549                                       struct ieee80211_sta *sta,
 550                                       unsigned int link_id)
 551 {
 552         struct ieee80211_link_sta *link_sta =
 553                 link_sta_dereference_protected(sta, link_id);
 554         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
 555         struct iwl_mvm_link_sta *link;
 556         u32 sta_id = iwl_mvm_find_free_sta_id(mvm,
 557                                           ieee80211_vif_type_p2p(vif));
 558
 559         if (sta_id == IWL_MVM_INVALID_STA)
 560                 return -ENOSPC;
 561
 562         if (rcu_access_pointer(sta->link[link_id]) == &sta->deflink) {
 563                 link = &mvm_sta->deflink;
 564         } else {
 565                 link = kzalloc(sizeof(*link), GFP_KERNEL);
 566                 if (!link)
 567                         return -ENOMEM;
 568         }
 569
 570         link->sta_id = sta_id;
 571         rcu_assign_pointer(mvm_sta->link[link_id], link);
 572         rcu_assign_pointer(mvm->fw_id_to_mac_id[link->sta_id], sta);
 573         rcu_assign_pointer(mvm->fw_id_to_link_sta[link->sta_id],
 574                            link_sta);
 575
 576         return 0;
 577 }
 578
 579 /* allocate all the links of a sta, called when the station is first added */
 580 static int iwl_mvm_mld_alloc_sta_links(struct iwl_mvm *mvm,
 581                                        struct ieee80211_vif *vif,
 582                                        struct ieee80211_sta *sta)
 583 {
 584         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
 585         unsigned int link_id;
 586         int ret;
 587
 588         lockdep_assert_held(&mvm->mutex);
 589
 590         for (link_id = 0; link_id < ARRAY_SIZE(sta->link); link_id++) {
 591                 if (!rcu_access_pointer(sta->link[link_id]) ||
 592                     mvm_sta->link[link_id])
 593                         continue;
 594
 595                 ret = iwl_mvm_mld_alloc_sta_link(mvm, vif, sta, link_id);
 596                 if (ret)
 597                         goto err;
 598         }
 599
 600         return 0;
 601
 602 err:
 603         iwl_mvm_mld_sta_rm_all_sta_links(mvm, mvm_sta);
 604         return ret;
 605 }
 606
 607 static void iwl_mvm_mld_set_ap_sta_id(struct ieee80211_sta *sta,
 608                                       struct iwl_mvm_vif_link_info *vif_link,
 609                                       struct iwl_mvm_link_sta *sta_link)
 610 {
 611         if (!sta->tdls) {
 612                 WARN_ON(vif_link->ap_sta_id != IWL_MVM_INVALID_STA);
 613                 vif_link->ap_sta_id = sta_link->sta_id;
 614         } else {
 615                 WARN_ON(vif_link->ap_sta_id == IWL_MVM_INVALID_STA);
 616         }
 617 }
 618
 619 /* FIXME: consider waiting for mac80211 to add the STA instead of allocating
 620  * queues here
 621  */
 622 static int iwl_mvm_alloc_sta_after_restart(struct iwl_mvm *mvm,
 623                                            struct ieee80211_vif *vif,
 624                                            struct ieee80211_sta *sta)
 625 {
 626         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
 627         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 628         struct ieee80211_link_sta *link_sta;
 629         unsigned int link_id;
 630         /* no active link found */
 631         int ret = -EINVAL;
 632         int sta_id;
 633
 634         /* First add an empty station since allocating a queue requires
 635          * a valid station. Since we need a link_id to allocate a station,
 636          * pick up the first valid one.
 637          */
 638         for_each_sta_active_link(vif, sta, link_sta, link_id) {
 639                 struct iwl_mvm_vif_link_info *mvm_link;
 640                 struct ieee80211_bss_conf *link_conf =
 641                         link_conf_dereference_protected(vif, link_id);
 642                 struct iwl_mvm_link_sta *mvm_link_sta =
 643                         rcu_dereference_protected(mvm_sta->link[link_id],
 644                                                   lockdep_is_held(&mvm->mutex));
 645
 646                 if (!link_conf)
 647                         continue;
 648
 649                 mvm_link = mvmvif->link[link_conf->link_id];
 650
 651                 if (!mvm_link || !mvm_link_sta)
 652                         continue;
 653
 654                 sta_id = mvm_link_sta->sta_id;
 655                 ret = iwl_mvm_mld_cfg_sta(mvm, sta, vif, link_sta,
 656                                           link_conf, mvm_link_sta);
 657                 if (ret)
 658                         return ret;
 659
 660                 rcu_assign_pointer(mvm->fw_id_to_mac_id[sta_id], sta);
 661                 rcu_assign_pointer(mvm->fw_id_to_link_sta[sta_id], link_sta);
 662                 ret = 0;
 663         }
 664
 665         iwl_mvm_realloc_queues_after_restart(mvm, sta);
 666
 667         return ret;
 668 }
 669
 670 int iwl_mvm_mld_add_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 671                         struct ieee80211_sta *sta)
 672 {
 673         struct iwl_mvm_vif *mvm_vif = iwl_mvm_vif_from_mac80211(vif);
 674         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
 675         unsigned long link_sta_added_to_fw = 0;
 676         struct ieee80211_link_sta *link_sta;
 677         int ret = 0;
 678         unsigned int link_id;
 679
 680         lockdep_assert_held(&mvm->mutex);
 681
 682         if (!test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status)) {
 683                 ret = iwl_mvm_mld_alloc_sta_links(mvm, vif, sta);
 684                 if (ret)
 685                         return ret;
 686
 687                 spin_lock_init(&mvm_sta->lock);
 688
 689                 ret = iwl_mvm_sta_init(mvm, vif, sta, IWL_MVM_INVALID_STA,
 690                                        STATION_TYPE_PEER);
 691         } else {
 692                 ret = iwl_mvm_alloc_sta_after_restart(mvm, vif, sta);
 693         }
 694
 695         if (ret)
 696                 goto err;
 697
 698         /* at this stage sta link pointers are already allocated */
 699         ret = iwl_mvm_mld_update_sta(mvm, vif, sta);
 700         if (ret)
 701                 goto err;
 702
 703         for_each_sta_active_link(vif, sta, link_sta, link_id) {
 704                 struct ieee80211_bss_conf *link_conf =
 705                         link_conf_dereference_protected(vif, link_id);
 706                 struct iwl_mvm_link_sta *mvm_link_sta =
 707                         rcu_dereference_protected(mvm_sta->link[link_id],
 708                                                   lockdep_is_held(&mvm->mutex));
 709
 710                 if (WARN_ON(!link_conf || !mvm_link_sta))
 711                         goto err;
 712
 713                 ret = iwl_mvm_mld_cfg_sta(mvm, sta, vif, link_sta, link_conf,
 714                                           mvm_link_sta);
 715                 if (ret)
 716                         goto err;
 717
 718                 link_sta_added_to_fw |= BIT(link_id);
 719
 720                 if (vif->type == NL80211_IFTYPE_STATION)
 721                         iwl_mvm_mld_set_ap_sta_id(sta, mvm_vif->link[link_id],
 722                                                   mvm_link_sta);
 723         }
 724
 725         return 0;
 726
 727 err:
 728         /* remove all already allocated stations in FW */
 729         for_each_set_bit(link_id, &link_sta_added_to_fw,
 730                          IEEE80211_MLD_MAX_NUM_LINKS) {
 731                 struct iwl_mvm_link_sta *mvm_link_sta =
 732                         rcu_dereference_protected(mvm_sta->link[link_id],
 733                                                   lockdep_is_held(&mvm->mutex));
 734
 735                 iwl_mvm_mld_rm_sta_from_fw(mvm, mvm_link_sta->sta_id);
 736         }
 737
 738         /* free all sta resources in the driver */
 739         iwl_mvm_mld_sta_rm_all_sta_links(mvm, mvm_sta);
 740         return ret;
 741 }
 742
 743 int iwl_mvm_mld_update_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 744                            struct ieee80211_sta *sta)
 745 {
 746         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
 747         struct ieee80211_link_sta *link_sta;
 748         unsigned int link_id;
 749         int ret = -EINVAL;
 750
 751         lockdep_assert_held(&mvm->mutex);
 752
 753         for_each_sta_active_link(vif, sta, link_sta, link_id) {
 754                 struct ieee80211_bss_conf *link_conf =
 755                         link_conf_dereference_protected(vif, link_id);
 756                 struct iwl_mvm_link_sta *mvm_link_sta =
 757                         rcu_dereference_protected(mvm_sta->link[link_id],
 758                                                   lockdep_is_held(&mvm->mutex));
 759
 760                 if (WARN_ON(!link_conf || !mvm_link_sta))
 761                         return -EINVAL;
 762
 763                 ret = iwl_mvm_mld_cfg_sta(mvm, sta, vif, link_sta, link_conf,
 764                                           mvm_link_sta);
 765
 766                 if (ret) {
 767                         IWL_ERR(mvm, "Failed to update sta link %d\n", link_id);
 768                         break;
 769                 }
 770         }
 771
 772         return ret;
 773 }
 774
 775 static void iwl_mvm_mld_disable_sta_queues(struct iwl_mvm *mvm,
 776                                            struct ieee80211_vif *vif,
 777                                            struct ieee80211_sta *sta)
 778 {
 779         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
 780         u32 sta_mask = iwl_mvm_sta_fw_id_mask(mvm, sta, -1);
 781         int i;
 782
 783         lockdep_assert_held(&mvm->mutex);
 784
 785         for (i = 0; i < ARRAY_SIZE(mvm_sta->tid_data); i++) {
 786                 if (mvm_sta->tid_data[i].txq_id == IWL_MVM_INVALID_QUEUE)
 787                         continue;
 788
 789                 iwl_mvm_mld_disable_txq(mvm, sta_mask,
 790                                         &mvm_sta->tid_data[i].txq_id, i);
 791                 mvm_sta->tid_data[i].txq_id = IWL_MVM_INVALID_QUEUE;
 792         }
 793
 794         for (i = 0; i < ARRAY_SIZE(sta->txq); i++) {
 795                 struct iwl_mvm_txq *mvmtxq =
 796                         iwl_mvm_txq_from_mac80211(sta->txq[i]);
 797
 798                 mvmtxq->txq_id = IWL_MVM_INVALID_QUEUE;
 799         }
 800 }
 801
 802 int iwl_mvm_mld_rm_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 803                        struct ieee80211_sta *sta)
 804 {
 805         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
 806         struct ieee80211_link_sta *link_sta;
 807         unsigned int link_id;
 808         int ret;
 809
 810         lockdep_assert_held(&mvm->mutex);
 811
 812         /* flush its queues here since we are freeing mvm_sta */
 813         for_each_sta_active_link(vif, sta, link_sta, link_id) {
 814                 struct iwl_mvm_link_sta *mvm_link_sta =
 815                         rcu_dereference_protected(mvm_sta->link[link_id],
 816                                                   lockdep_is_held(&mvm->mutex));
 817
 818                 if (WARN_ON(!mvm_link_sta))
 819                         return -EINVAL;
 820
 821                 ret = iwl_mvm_flush_sta_tids(mvm, mvm_link_sta->sta_id,
 822                                              0xffff);
 823                 if (ret)
 824                         return ret;
 825         }
 826
 827         ret = iwl_mvm_wait_sta_queues_empty(mvm, mvm_sta);
 828         if (ret)
 829                 return ret;
 830
 831         iwl_mvm_mld_disable_sta_queues(mvm, vif, sta);
 832
 833         for_each_sta_active_link(vif, sta, link_sta, link_id) {
 834                 struct iwl_mvm_link_sta *mvm_link_sta =
 835                         rcu_dereference_protected(mvm_sta->link[link_id],
 836                                                   lockdep_is_held(&mvm->mutex));
 837                 bool stay_in_fw;
 838
 839                 stay_in_fw = iwl_mvm_sta_del(mvm, vif, sta, link_sta, &ret);
 840                 if (ret)
 841                         break;
 842
 843                 if (!stay_in_fw)
 844                         ret = iwl_mvm_mld_rm_sta_from_fw(mvm,
 845                                                          mvm_link_sta->sta_id);
 846
 847                 iwl_mvm_mld_free_sta_link(mvm, mvm_sta, mvm_link_sta,
 848                                           link_id, stay_in_fw);
 849         }
 850
 851         return ret;
 852 }
 853
 854 int iwl_mvm_mld_rm_sta_id(struct iwl_mvm *mvm, u8 sta_id)
 855 {
 856         int ret = iwl_mvm_mld_rm_sta_from_fw(mvm, sta_id);
 857
 858         lockdep_assert_held(&mvm->mutex);
 859
 860         RCU_INIT_POINTER(mvm->fw_id_to_mac_id[sta_id], NULL);
 861         RCU_INIT_POINTER(mvm->fw_id_to_link_sta[sta_id], NULL);
 862         return ret;
 863 }
 864
 865 void iwl_mvm_mld_sta_modify_disable_tx(struct iwl_mvm *mvm,
 866                                        struct iwl_mvm_sta *mvmsta,
 867                                        bool disable)
 868 {
 869         struct iwl_mvm_sta_disable_tx_cmd cmd;
 870         int ret;
 871
 872         cmd.sta_id = cpu_to_le32(mvmsta->deflink.sta_id);
 873         cmd.disable = cpu_to_le32(disable);
 874
 875         ret = iwl_mvm_send_cmd_pdu(mvm,
 876                                    WIDE_ID(MAC_CONF_GROUP, STA_DISABLE_TX_CMD),
 877                                    CMD_ASYNC, sizeof(cmd), &cmd);
 878         if (ret)
 879                 IWL_ERR(mvm,
 880                         "Failed to send STA_DISABLE_TX_CMD command (%d)\n",
 881                         ret);
 882 }
 883
 884 void iwl_mvm_mld_sta_modify_disable_tx_ap(struct iwl_mvm *mvm,
 885                                           struct ieee80211_sta *sta,
 886                                           bool disable)
 887 {
 888         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
 889
 890         spin_lock_bh(&mvm_sta->lock);
 891
 892         if (mvm_sta->disable_tx == disable) {
 893                 spin_unlock_bh(&mvm_sta->lock);
 894                 return;
 895         }
 896
 897         iwl_mvm_mld_sta_modify_disable_tx(mvm, mvm_sta, disable);
 898
 899         spin_unlock_bh(&mvm_sta->lock);
 900 }
 901
 902 void iwl_mvm_mld_modify_all_sta_disable_tx(struct iwl_mvm *mvm,
 903                                            struct iwl_mvm_vif *mvmvif,
 904                                            bool disable)
 905 {
 906         struct ieee80211_sta *sta;
 907         struct iwl_mvm_sta *mvm_sta;
 908         int i;
 909
 910         rcu_read_lock();
 911
 912         /* Block/unblock all the stations of the given mvmvif */
 913         for (i = 0; i < mvm->fw->ucode_capa.num_stations; i++) {
 914                 sta = rcu_dereference(mvm->fw_id_to_mac_id[i]);
 915                 if (IS_ERR_OR_NULL(sta))
 916                         continue;
 917
 918                 mvm_sta = iwl_mvm_sta_from_mac80211(sta);
 919                 if (mvm_sta->mac_id_n_color !=
 920                     FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color))
 921                         continue;
 922
 923                 iwl_mvm_mld_sta_modify_disable_tx(mvm, mvm_sta, disable);
 924         }
 925
 926         rcu_read_unlock();
 927 }
 928
 929 static int iwl_mvm_mld_update_sta_queues(struct iwl_mvm *mvm,
 930                                          struct ieee80211_sta *sta,
 931                                          u32 old_sta_mask,
 932                                          u32 new_sta_mask)
 933 {
 934         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
 935         struct iwl_scd_queue_cfg_cmd cmd = {
 936                 .operation = cpu_to_le32(IWL_SCD_QUEUE_MODIFY),
 937                 .u.modify.old_sta_mask = cpu_to_le32(old_sta_mask),
 938                 .u.modify.new_sta_mask = cpu_to_le32(new_sta_mask),
 939         };
 940         struct iwl_host_cmd hcmd = {
 941                 .id = WIDE_ID(DATA_PATH_GROUP, SCD_QUEUE_CONFIG_CMD),
 942                 .len[0] = sizeof(cmd),
 943                 .data[0] = &cmd
 944         };
 945         int tid;
 946         int ret;
 947
 948         lockdep_assert_held(&mvm->mutex);
 949
 950         for (tid = 0; tid <= IWL_MAX_TID_COUNT; tid++) {
 951                 struct iwl_mvm_tid_data *tid_data = &mvm_sta->tid_data[tid];
 952                 int txq_id = tid_data->txq_id;
 953
 954                 if (txq_id == IWL_MVM_INVALID_QUEUE)
 955                         continue;
 956
 957                 if (tid == IWL_MAX_TID_COUNT)
 958                         cmd.u.modify.tid = cpu_to_le32(IWL_MGMT_TID);
 959                 else
 960                         cmd.u.modify.tid = cpu_to_le32(tid);
 961
 962                 ret = iwl_mvm_send_cmd(mvm, &hcmd);
 963                 if (ret)
 964                         return ret;
 965         }
 966
 967         return 0;
 968 }
 969
 970 static int iwl_mvm_mld_update_sta_baids(struct iwl_mvm *mvm,
 971                                         u32 old_sta_mask,
 972                                         u32 new_sta_mask)
 973 {
 974         struct iwl_rx_baid_cfg_cmd cmd = {
 975                 .action = cpu_to_le32(IWL_RX_BAID_ACTION_MODIFY),
 976                 .modify.old_sta_id_mask = cpu_to_le32(old_sta_mask),
 977                 .modify.new_sta_id_mask = cpu_to_le32(new_sta_mask),
 978         };
 979         u32 cmd_id = WIDE_ID(DATA_PATH_GROUP, RX_BAID_ALLOCATION_CONFIG_CMD);
 980         int baid;
 981
 982         BUILD_BUG_ON(sizeof(struct iwl_rx_baid_cfg_resp) != sizeof(baid));
 983
 984         for (baid = 0; baid < ARRAY_SIZE(mvm->baid_map); baid++) {
 985                 struct iwl_mvm_baid_data *data;
 986                 int ret;
 987
 988                 data = rcu_dereference_protected(mvm->baid_map[baid],
 989                                                  lockdep_is_held(&mvm->mutex));
 990                 if (!data)
 991                         continue;
 992
 993                 if (!(data->sta_mask & old_sta_mask))
 994                         continue;
 995
 996                 WARN_ONCE(data->sta_mask != old_sta_mask,
 997                           "BAID data for %d corrupted - expected 0x%x found 0x%x\n",
 998                           baid, old_sta_mask, data->sta_mask);
 999
1000                 cmd.modify.tid = cpu_to_le32(data->tid);
1001
1002                 ret = iwl_mvm_send_cmd_pdu(mvm, cmd_id, 0, sizeof(cmd), &cmd);
1003                 data->sta_mask = new_sta_mask;
1004                 if (ret)
1005                         return ret;
1006         }
1007
1008         return 0;
1009 }
1010
1011 static int iwl_mvm_mld_update_sta_resources(struct iwl_mvm *mvm,
1012                                             struct ieee80211_vif *vif,
1013                                             struct ieee80211_sta *sta,
1014                                             u32 old_sta_mask,
1015                                             u32 new_sta_mask)
1016 {
1017         int ret;
1018
1019         ret = iwl_mvm_mld_update_sta_queues(mvm, sta,
1020                                             old_sta_mask,
1021                                             new_sta_mask);
1022         if (ret)
1023                 return ret;
1024
1025         ret = iwl_mvm_mld_update_sta_keys(mvm, vif, sta,
1026                                           old_sta_mask,
1027                                           new_sta_mask);
1028         if (ret)
1029                 return ret;
1030
1031         return iwl_mvm_mld_update_sta_baids(mvm, old_sta_mask, new_sta_mask);
1032 }
1033
1034 int iwl_mvm_mld_update_sta_links(struct iwl_mvm *mvm,
1035                                  struct ieee80211_vif *vif,
1036                                  struct ieee80211_sta *sta,
1037                                  u16 old_links, u16 new_links)
1038 {
1039         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
1040         struct iwl_mvm_vif *mvm_vif = iwl_mvm_vif_from_mac80211(vif);
1041         struct iwl_mvm_link_sta *mvm_sta_link;
1042         struct iwl_mvm_vif_link_info *mvm_vif_link;
1043         unsigned long links_to_add = ~old_links & new_links;
1044         unsigned long links_to_rem = old_links & ~new_links;
1045         unsigned long old_links_long = old_links;
1046         u32 current_sta_mask = 0, sta_mask_added = 0, sta_mask_to_rem = 0;
1047         unsigned long link_sta_added_to_fw = 0, link_sta_allocated = 0;
1048         unsigned int link_id;
1049         int ret;
1050
1051         lockdep_assert_held(&mvm->mutex);
1052
1053         for_each_set_bit(link_id, &old_links_long,
1054                          IEEE80211_MLD_MAX_NUM_LINKS) {
1055                 mvm_sta_link =
1056                         rcu_dereference_protected(mvm_sta->link[link_id],
1057                                                   lockdep_is_held(&mvm->mutex));
1058
1059                 if (WARN_ON(!mvm_sta_link)) {
1060                         ret = -EINVAL;
1061                         goto err;
1062                 }
1063
1064                 current_sta_mask |= BIT(mvm_sta_link->sta_id);
1065                 if (links_to_rem & BIT(link_id))
1066                         sta_mask_to_rem |= BIT(mvm_sta_link->sta_id);
1067         }
1068
1069         if (sta_mask_to_rem) {
1070                 ret = iwl_mvm_mld_update_sta_resources(mvm, vif, sta,
1071                                                        current_sta_mask,
1072                                                        current_sta_mask &
1073                                                         ~sta_mask_to_rem);
1074                 if (WARN_ON(ret))
1075                         goto err;
1076
1077                 current_sta_mask &= ~sta_mask_to_rem;
1078         }
1079
1080         for_each_set_bit(link_id, &links_to_rem, IEEE80211_MLD_MAX_NUM_LINKS) {
1081                 mvm_sta_link =
1082                         rcu_dereference_protected(mvm_sta->link[link_id],
1083                                                   lockdep_is_held(&mvm->mutex));
1084                 mvm_vif_link = mvm_vif->link[link_id];
1085
1086                 if (WARN_ON(!mvm_sta_link || !mvm_vif_link)) {
1087                         ret = -EINVAL;
1088                         goto err;
1089                 }
1090
1091                 ret = iwl_mvm_mld_rm_sta_from_fw(mvm, mvm_sta_link->sta_id);
1092                 if (WARN_ON(ret))
1093                         goto err;
1094
1095                 if (vif->type == NL80211_IFTYPE_STATION)
1096                         mvm_vif_link->ap_sta_id = IWL_MVM_INVALID_STA;
1097
1098                 iwl_mvm_mld_free_sta_link(mvm, mvm_sta, mvm_sta_link, link_id,
1099                                           false);
1100         }
1101
1102         for_each_set_bit(link_id, &links_to_add, IEEE80211_MLD_MAX_NUM_LINKS) {
1103                 struct ieee80211_bss_conf *link_conf =
1104                         link_conf_dereference_protected(vif, link_id);
1105                 struct ieee80211_link_sta *link_sta =
1106                         link_sta_dereference_protected(sta, link_id);
1107                 mvm_vif_link = mvm_vif->link[link_id];
1108
1109                 if (WARN_ON(!mvm_vif_link || !link_conf || !link_sta)) {
1110                         ret = -EINVAL;
1111                         goto err;
1112                 }
1113
1114                 if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status)) {
1115                         if (WARN_ON(!mvm_sta->link[link_id])) {
1116                                 ret = -EINVAL;
1117                                 goto err;
1118                         }
1119                 } else {
1120                         if (WARN_ON(mvm_sta->link[link_id])) {
1121                                 ret = -EINVAL;
1122                                 goto err;
1123                         }
1124                         ret = iwl_mvm_mld_alloc_sta_link(mvm, vif, sta,
1125                                                          link_id);
1126                         if (WARN_ON(ret))
1127                                 goto err;
1128                 }
1129
1130                 link_sta->agg.max_rc_amsdu_len = 1;
1131                 ieee80211_sta_recalc_aggregates(sta);
1132
1133                 mvm_sta_link =
1134                         rcu_dereference_protected(mvm_sta->link[link_id],
1135                                                   lockdep_is_held(&mvm->mutex));
1136
1137                 if (WARN_ON(!mvm_sta_link)) {
1138                         ret = -EINVAL;
1139                         goto err;
1140                 }
1141
1142                 if (vif->type == NL80211_IFTYPE_STATION)
1143                         iwl_mvm_mld_set_ap_sta_id(sta, mvm_vif_link,
1144                                                   mvm_sta_link);
1145
1146                 link_sta_allocated |= BIT(link_id);
1147
1148                 sta_mask_added |= BIT(mvm_sta_link->sta_id);
1149
1150                 ret = iwl_mvm_mld_cfg_sta(mvm, sta, vif, link_sta, link_conf,
1151                                           mvm_sta_link);
1152                 if (WARN_ON(ret))
1153                         goto err;
1154
1155                 link_sta_added_to_fw |= BIT(link_id);
1156
1157                 iwl_mvm_rs_add_sta_link(mvm, mvm_sta_link);
1158         }
1159
1160         if (sta_mask_added) {
1161                 ret = iwl_mvm_mld_update_sta_resources(mvm, vif, sta,
1162                                                        current_sta_mask,
1163                                                        current_sta_mask |
1164                                                         sta_mask_added);
1165                 if (WARN_ON(ret))
1166                         goto err;
1167         }
1168
1169         return 0;
1170
1171 err:
1172         /* remove all already allocated stations in FW */
1173         for_each_set_bit(link_id, &link_sta_added_to_fw,
1174                          IEEE80211_MLD_MAX_NUM_LINKS) {
1175                 mvm_sta_link =
1176                         rcu_dereference_protected(mvm_sta->link[link_id],
1177                                                   lockdep_is_held(&mvm->mutex));
1178
1179                 iwl_mvm_mld_rm_sta_from_fw(mvm, mvm_sta_link->sta_id);
1180         }
1181
1182         /* remove all already allocated station links in driver */
1183         for_each_set_bit(link_id, &link_sta_allocated,
1184                          IEEE80211_MLD_MAX_NUM_LINKS) {
1185                 mvm_sta_link =
1186                         rcu_dereference_protected(mvm_sta->link[link_id],
1187                                                   lockdep_is_held(&mvm->mutex));
1188
1189                 iwl_mvm_mld_free_sta_link(mvm, mvm_sta, mvm_sta_link, link_id,
1190                                           false);
1191         }
1192
1193         return ret;
1194 }