drivers/net/wireless/iwlwifi/mvm/rx.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) 2012 - 2014 Intel Corporation. All rights reserved.
   9  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of version 2 of the GNU General Public License as
  13  * published by the Free Software Foundation.
  14  *
  15  * This program is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  23  * USA
  24  *
  25  * The full GNU General Public License is included in this distribution
  26  * in the file called COPYING.
  27  *
  28  * Contact Information:
  29  *  Intel Linux Wireless <ilw@linux.intel.com>
  30  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  31  *
  32  * BSD LICENSE
  33  *
  34  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  35  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
  36  * All rights reserved.
  37  *
  38  * Redistribution and use in source and binary forms, with or without
  39  * modification, are permitted provided that the following conditions
  40  * are met:
  41  *
  42  *  * Redistributions of source code must retain the above copyright
  43  *    notice, this list of conditions and the following disclaimer.
  44  *  * Redistributions in binary form must reproduce the above copyright
  45  *    notice, this list of conditions and the following disclaimer in
  46  *    the documentation and/or other materials provided with the
  47  *    distribution.
  48  *  * Neither the name Intel Corporation nor the names of its
  49  *    contributors may be used to endorse or promote products derived
  50  *    from this software without specific prior written permission.
  51  *
  52  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  53  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  54  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  55  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  56  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  57  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  58  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  59  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  60  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  61  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  62  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  63  *****************************************************************************/
  64 #include "iwl-trans.h"
  65 #include "mvm.h"
  66 #include "fw-api.h"
  67
  68 /*
  69  * iwl_mvm_rx_rx_phy_cmd - REPLY_RX_PHY_CMD handler
  70  *
  71  * Copies the phy information in mvm->last_phy_info, it will be used when the
  72  * actual data will come from the fw in the next packet.
  73  */
  74 int iwl_mvm_rx_rx_phy_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
  75                           struct iwl_device_cmd *cmd)
  76 {
  77         struct iwl_rx_packet *pkt = rxb_addr(rxb);
  78
  79         memcpy(&mvm->last_phy_info, pkt->data, sizeof(mvm->last_phy_info));
  80         mvm->ampdu_ref++;
  81
  82 #ifdef CONFIG_IWLWIFI_DEBUGFS
  83         if (mvm->last_phy_info.phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
  84                 spin_lock(&mvm->drv_stats_lock);
  85                 mvm->drv_rx_stats.ampdu_count++;
  86                 spin_unlock(&mvm->drv_stats_lock);
  87         }
  88 #endif
  89
  90         return 0;
  91 }
  92
  93 /*
  94  * iwl_mvm_pass_packet_to_mac80211 - builds the packet for mac80211
  95  *
  96  * Adds the rxb to a new skb and give it to mac80211
  97  */
  98 static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm,
  99                                             struct sk_buff *skb,
 100                                             struct ieee80211_hdr *hdr, u16 len,
 101                                             u32 ampdu_status, u8 crypt_len,
 102                                             struct iwl_rx_cmd_buffer *rxb)
 103 {
 104         unsigned int hdrlen, fraglen;
 105
 106         /* If frame is small enough to fit in skb->head, pull it completely.
 107          * If not, only pull ieee80211_hdr (including crypto if present, and
 108          * an additional 8 bytes for SNAP/ethertype, see below) so that
 109          * splice() or TCP coalesce are more efficient.
 110          *
 111          * Since, in addition, ieee80211_data_to_8023() always pull in at
 112          * least 8 bytes (possibly more for mesh) we can do the same here
 113          * to save the cost of doing it later. That still doesn't pull in
 114          * the actual IP header since the typical case has a SNAP header.
 115          * If the latter changes (there are efforts in the standards group
 116          * to do so) we should revisit this and ieee80211_data_to_8023().
 117          */
 118         hdrlen = (len <= skb_tailroom(skb)) ? len :
 119                                               sizeof(*hdr) + crypt_len + 8;
 120
 121         memcpy(skb_put(skb, hdrlen), hdr, hdrlen);
 122         fraglen = len - hdrlen;
 123
 124         if (fraglen) {
 125                 int offset = (void *)hdr + hdrlen -
 126                              rxb_addr(rxb) + rxb_offset(rxb);
 127
 128                 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
 129                                 fraglen, rxb->truesize);
 130         }
 131
 132         ieee80211_rx(mvm->hw, skb);
 133 }
 134
 135 /*
 136  * iwl_mvm_get_signal_strength - use new rx PHY INFO API
 137  * values are reported by the fw as positive values - need to negate
 138  * to obtain their dBM.  Account for missing antennas by replacing 0
 139  * values by -256dBm: practically 0 power and a non-feasible 8 bit value.
 140  */
 141 static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm,
 142                                         struct iwl_rx_phy_info *phy_info,
 143                                         struct ieee80211_rx_status *rx_status)
 144 {
 145         int energy_a, energy_b, energy_c, max_energy;
 146         u32 val;
 147
 148         val =
 149             le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_ENERGY_ANT_ABC_IDX]);
 150         energy_a = (val & IWL_RX_INFO_ENERGY_ANT_A_MSK) >>
 151                                                 IWL_RX_INFO_ENERGY_ANT_A_POS;
 152         energy_a = energy_a ? -energy_a : S8_MIN;
 153         energy_b = (val & IWL_RX_INFO_ENERGY_ANT_B_MSK) >>
 154                                                 IWL_RX_INFO_ENERGY_ANT_B_POS;
 155         energy_b = energy_b ? -energy_b : S8_MIN;
 156         energy_c = (val & IWL_RX_INFO_ENERGY_ANT_C_MSK) >>
 157                                                 IWL_RX_INFO_ENERGY_ANT_C_POS;
 158         energy_c = energy_c ? -energy_c : S8_MIN;
 159         max_energy = max(energy_a, energy_b);
 160         max_energy = max(max_energy, energy_c);
 161
 162         IWL_DEBUG_STATS(mvm, "energy In A %d B %d C %d , and max %d\n",
 163                         energy_a, energy_b, energy_c, max_energy);
 164
 165         rx_status->signal = max_energy;
 166         rx_status->chains = (le16_to_cpu(phy_info->phy_flags) &
 167                                 RX_RES_PHY_FLAGS_ANTENNA)
 168                                         >> RX_RES_PHY_FLAGS_ANTENNA_POS;
 169         rx_status->chain_signal[0] = energy_a;
 170         rx_status->chain_signal[1] = energy_b;
 171         rx_status->chain_signal[2] = energy_c;
 172 }
 173
 174 /*
 175  * iwl_mvm_set_mac80211_rx_flag - translate fw status to mac80211 format
 176  * @mvm: the mvm object
 177  * @hdr: 80211 header
 178  * @stats: status in mac80211's format
 179  * @rx_pkt_status: status coming from fw
 180  *
 181  * returns non 0 value if the packet should be dropped
 182  */
 183 static u32 iwl_mvm_set_mac80211_rx_flag(struct iwl_mvm *mvm,
 184                                         struct ieee80211_hdr *hdr,
 185                                         struct ieee80211_rx_status *stats,
 186                                         u32 rx_pkt_status,
 187                                         u8 *crypt_len)
 188 {
 189         if (!ieee80211_has_protected(hdr->frame_control) ||
 190             (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 191                              RX_MPDU_RES_STATUS_SEC_NO_ENC)
 192                 return 0;
 193
 194         /* packet was encrypted with unknown alg */
 195         if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 196                                         RX_MPDU_RES_STATUS_SEC_ENC_ERR)
 197                 return 0;
 198
 199         switch (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) {
 200         case RX_MPDU_RES_STATUS_SEC_CCM_ENC:
 201                 /* alg is CCM: check MIC only */
 202                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
 203                         return -1;
 204
 205                 stats->flag |= RX_FLAG_DECRYPTED;
 206                 IWL_DEBUG_WEP(mvm, "hw decrypted CCMP successfully\n");
 207                 *crypt_len = IEEE80211_CCMP_HDR_LEN;
 208                 return 0;
 209
 210         case RX_MPDU_RES_STATUS_SEC_TKIP_ENC:
 211                 /* Don't drop the frame and decrypt it in SW */
 212                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_TTAK_OK))
 213                         return 0;
 214                 *crypt_len = IEEE80211_TKIP_IV_LEN;
 215                 /* fall through if TTAK OK */
 216
 217         case RX_MPDU_RES_STATUS_SEC_WEP_ENC:
 218                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_ICV_OK))
 219                         return -1;
 220
 221                 stats->flag |= RX_FLAG_DECRYPTED;
 222                 if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 223                                 RX_MPDU_RES_STATUS_SEC_WEP_ENC)
 224                         *crypt_len = IEEE80211_WEP_IV_LEN;
 225                 return 0;
 226
 227         case RX_MPDU_RES_STATUS_SEC_EXT_ENC:
 228                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
 229                         return -1;
 230                 stats->flag |= RX_FLAG_DECRYPTED;
 231                 return 0;
 232
 233         default:
 234                 IWL_ERR(mvm, "Unhandled alg: 0x%x\n", rx_pkt_status);
 235         }
 236
 237         return 0;
 238 }
 239
 240 /*
 241  * iwl_mvm_rx_rx_mpdu - REPLY_RX_MPDU_CMD handler
 242  *
 243  * Handles the actual data of the Rx packet from the fw
 244  */
 245 int iwl_mvm_rx_rx_mpdu(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 246                        struct iwl_device_cmd *cmd)
 247 {
 248         struct ieee80211_hdr *hdr;
 249         struct ieee80211_rx_status *rx_status;
 250         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 251         struct iwl_rx_phy_info *phy_info;
 252         struct iwl_rx_mpdu_res_start *rx_res;
 253         struct ieee80211_sta *sta;
 254         struct sk_buff *skb;
 255         u32 len;
 256         u32 ampdu_status;
 257         u32 rate_n_flags;
 258         u32 rx_pkt_status;
 259         u8 crypt_len = 0;
 260
 261         phy_info = &mvm->last_phy_info;
 262         rx_res = (struct iwl_rx_mpdu_res_start *)pkt->data;
 263         hdr = (struct ieee80211_hdr *)(pkt->data + sizeof(*rx_res));
 264         len = le16_to_cpu(rx_res->byte_count);
 265         rx_pkt_status = le32_to_cpup((__le32 *)
 266                 (pkt->data + sizeof(*rx_res) + len));
 267
 268         /* Dont use dev_alloc_skb(), we'll have enough headroom once
 269          * ieee80211_hdr pulled.
 270          */
 271         skb = alloc_skb(128, GFP_ATOMIC);
 272         if (!skb) {
 273                 IWL_ERR(mvm, "alloc_skb failed\n");
 274                 return 0;
 275         }
 276
 277         rx_status = IEEE80211_SKB_RXCB(skb);
 278
 279         /*
 280          * drop the packet if it has failed being decrypted by HW
 281          */
 282         if (iwl_mvm_set_mac80211_rx_flag(mvm, hdr, rx_status, rx_pkt_status,
 283                                          &crypt_len)) {
 284                 IWL_DEBUG_DROP(mvm, "Bad decryption results 0x%08x\n",
 285                                rx_pkt_status);
 286                 kfree_skb(skb);
 287                 return 0;
 288         }
 289
 290         if ((unlikely(phy_info->cfg_phy_cnt > 20))) {
 291                 IWL_DEBUG_DROP(mvm, "dsp size out of range [0,20]: %d\n",
 292                                phy_info->cfg_phy_cnt);
 293                 kfree_skb(skb);
 294                 return 0;
 295         }
 296
 297         /*
 298          * Keep packets with CRC errors (and with overrun) for monitor mode
 299          * (otherwise the firmware discards them) but mark them as bad.
 300          */
 301         if (!(rx_pkt_status & RX_MPDU_RES_STATUS_CRC_OK) ||
 302             !(rx_pkt_status & RX_MPDU_RES_STATUS_OVERRUN_OK)) {
 303                 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n", rx_pkt_status);
 304                 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
 305         }
 306
 307         /* This will be used in several places later */
 308         rate_n_flags = le32_to_cpu(phy_info->rate_n_flags);
 309
 310         /* rx_status carries information about the packet to mac80211 */
 311         rx_status->mactime = le64_to_cpu(phy_info->timestamp);
 312         rx_status->device_timestamp = le32_to_cpu(phy_info->system_timestamp);
 313         rx_status->band =
 314                 (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_BAND_24)) ?
 315                                 IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
 316         rx_status->freq =
 317                 ieee80211_channel_to_frequency(le16_to_cpu(phy_info->channel),
 318                                                rx_status->band);
 319         /*
 320          * TSF as indicated by the fw is at INA time, but mac80211 expects the
 321          * TSF at the beginning of the MPDU.
 322          */
 323         /*rx_status->flag |= RX_FLAG_MACTIME_MPDU;*/
 324
 325         iwl_mvm_get_signal_strength(mvm, phy_info, rx_status);
 326
 327         IWL_DEBUG_STATS_LIMIT(mvm, "Rssi %d, TSF %llu\n", rx_status->signal,
 328                               (unsigned long long)rx_status->mactime);
 329
 330         rcu_read_lock();
 331         /*
 332          * We have tx blocked stations (with CS bit). If we heard frames from
 333          * a blocked station on a new channel we can TX to it again.
 334          */
 335         if (unlikely(mvm->csa_tx_block_bcn_timeout)) {
 336                 sta = ieee80211_find_sta(
 337                         rcu_dereference(mvm->csa_tx_blocked_vif), hdr->addr2);
 338                 if (sta)
 339                         iwl_mvm_sta_modify_disable_tx_ap(mvm, sta, false);
 340         }
 341
 342         /* This is fine since we don't support multiple AP interfaces */
 343         sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL);
 344         if (sta) {
 345                 struct iwl_mvm_sta *mvmsta;
 346                 mvmsta = iwl_mvm_sta_from_mac80211(sta);
 347                 rs_update_last_rssi(mvm, &mvmsta->lq_sta, rx_status);
 348         }
 349
 350         rcu_read_unlock();
 351
 352         /* set the preamble flag if appropriate */
 353         if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_SHORT_PREAMBLE))
 354                 rx_status->flag |= RX_FLAG_SHORTPRE;
 355
 356         if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
 357                 /*
 358                  * We know which subframes of an A-MPDU belong
 359                  * together since we get a single PHY response
 360                  * from the firmware for all of them
 361                  */
 362                 rx_status->flag |= RX_FLAG_AMPDU_DETAILS;
 363                 rx_status->ampdu_reference = mvm->ampdu_ref;
 364         }
 365
 366         /* Set up the HT phy flags */
 367         switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
 368         case RATE_MCS_CHAN_WIDTH_20:
 369                 break;
 370         case RATE_MCS_CHAN_WIDTH_40:
 371                 rx_status->flag |= RX_FLAG_40MHZ;
 372                 break;
 373         case RATE_MCS_CHAN_WIDTH_80:
 374                 rx_status->vht_flag |= RX_VHT_FLAG_80MHZ;
 375                 break;
 376         case RATE_MCS_CHAN_WIDTH_160:
 377                 rx_status->vht_flag |= RX_VHT_FLAG_160MHZ;
 378                 break;
 379         }
 380         if (rate_n_flags & RATE_MCS_SGI_MSK)
 381                 rx_status->flag |= RX_FLAG_SHORT_GI;
 382         if (rate_n_flags & RATE_HT_MCS_GF_MSK)
 383                 rx_status->flag |= RX_FLAG_HT_GF;
 384         if (rate_n_flags & RATE_MCS_LDPC_MSK)
 385                 rx_status->flag |= RX_FLAG_LDPC;
 386         if (rate_n_flags & RATE_MCS_HT_MSK) {
 387                 u8 stbc = (rate_n_flags & RATE_MCS_HT_STBC_MSK) >>
 388                                 RATE_MCS_STBC_POS;
 389                 rx_status->flag |= RX_FLAG_HT;
 390                 rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
 391                 rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT;
 392         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 393                 u8 stbc = (rate_n_flags & RATE_MCS_VHT_STBC_MSK) >>
 394                                 RATE_MCS_STBC_POS;
 395                 rx_status->vht_nss =
 396                         ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
 397                                                 RATE_VHT_MCS_NSS_POS) + 1;
 398                 rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 399                 rx_status->flag |= RX_FLAG_VHT;
 400                 rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT;
 401                 if (rate_n_flags & RATE_MCS_BF_MSK)
 402                         rx_status->vht_flag |= RX_VHT_FLAG_BF;
 403         } else {
 404                 rx_status->rate_idx =
 405                         iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
 406                                                             rx_status->band);
 407         }
 408
 409 #ifdef CONFIG_IWLWIFI_DEBUGFS
 410         iwl_mvm_update_frame_stats(mvm, rate_n_flags,
 411                                    rx_status->flag & RX_FLAG_AMPDU_DETAILS);
 412 #endif
 413         iwl_mvm_pass_packet_to_mac80211(mvm, skb, hdr, len, ampdu_status,
 414                                         crypt_len, rxb);
 415         return 0;
 416 }
 417
 418 static void iwl_mvm_update_rx_statistics(struct iwl_mvm *mvm,
 419                                          struct iwl_notif_statistics *stats)
 420 {
 421         /*
 422          * NOTE FW aggregates the statistics - BUT the statistics are cleared
 423          * when the driver issues REPLY_STATISTICS_CMD 0x9c with CLEAR_STATS
 424          * bit set.
 425          */
 426         lockdep_assert_held(&mvm->mutex);
 427         memcpy(&mvm->rx_stats, &stats->rx, sizeof(struct mvm_statistics_rx));
 428 }
 429
 430 struct iwl_mvm_stat_data {
 431         struct iwl_notif_statistics *stats;
 432         struct iwl_mvm *mvm;
 433 };
 434
 435 static void iwl_mvm_stat_iterator(void *_data, u8 *mac,
 436                                   struct ieee80211_vif *vif)
 437 {
 438         struct iwl_mvm_stat_data *data = _data;
 439         struct iwl_notif_statistics *stats = data->stats;
 440         struct iwl_mvm *mvm = data->mvm;
 441         int sig = -stats->general.beacon_filter_average_energy;
 442         int last_event;
 443         int thold = vif->bss_conf.cqm_rssi_thold;
 444         int hyst = vif->bss_conf.cqm_rssi_hyst;
 445         u16 id = le32_to_cpu(stats->rx.general.mac_id);
 446         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 447
 448         if (mvmvif->id != id)
 449                 return;
 450
 451         if (vif->type != NL80211_IFTYPE_STATION)
 452                 return;
 453
 454         mvmvif->bf_data.ave_beacon_signal = sig;
 455
 456         /* BT Coex */
 457         if (mvmvif->bf_data.bt_coex_min_thold !=
 458             mvmvif->bf_data.bt_coex_max_thold) {
 459                 last_event = mvmvif->bf_data.last_bt_coex_event;
 460                 if (sig > mvmvif->bf_data.bt_coex_max_thold &&
 461                     (last_event <= mvmvif->bf_data.bt_coex_min_thold ||
 462                      last_event == 0)) {
 463                         mvmvif->bf_data.last_bt_coex_event = sig;
 464                         IWL_DEBUG_RX(mvm, "cqm_iterator bt coex high %d\n",
 465                                      sig);
 466                         iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_HIGH);
 467                 } else if (sig < mvmvif->bf_data.bt_coex_min_thold &&
 468                            (last_event >= mvmvif->bf_data.bt_coex_max_thold ||
 469                             last_event == 0)) {
 470                         mvmvif->bf_data.last_bt_coex_event = sig;
 471                         IWL_DEBUG_RX(mvm, "cqm_iterator bt coex low %d\n",
 472                                      sig);
 473                         iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_LOW);
 474                 }
 475         }
 476
 477         if (!(vif->driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI))
 478                 return;
 479
 480         /* CQM Notification */
 481         last_event = mvmvif->bf_data.last_cqm_event;
 482         if (thold && sig < thold && (last_event == 0 ||
 483                                      sig < last_event - hyst)) {
 484                 mvmvif->bf_data.last_cqm_event = sig;
 485                 IWL_DEBUG_RX(mvm, "cqm_iterator cqm low %d\n",
 486                              sig);
 487                 ieee80211_cqm_rssi_notify(
 488                         vif,
 489                         NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
 490                         GFP_KERNEL);
 491         } else if (sig > thold &&
 492                    (last_event == 0 || sig > last_event + hyst)) {
 493                 mvmvif->bf_data.last_cqm_event = sig;
 494                 IWL_DEBUG_RX(mvm, "cqm_iterator cqm high %d\n",
 495                              sig);
 496                 ieee80211_cqm_rssi_notify(
 497                         vif,
 498                         NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
 499                         GFP_KERNEL);
 500         }
 501 }
 502
 503 /*
 504  * iwl_mvm_rx_statistics - STATISTICS_NOTIFICATION handler
 505  *
 506  * TODO: This handler is implemented partially.
 507  */
 508 int iwl_mvm_rx_statistics(struct iwl_mvm *mvm,
 509                           struct iwl_rx_cmd_buffer *rxb,
 510                           struct iwl_device_cmd *cmd)
 511 {
 512         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 513         struct iwl_notif_statistics *stats = (void *)&pkt->data;
 514         struct iwl_mvm_stat_data data = {
 515                 .stats = stats,
 516                 .mvm = mvm,
 517         };
 518
 519         /* Only handle rx statistics temperature changes if async temp
 520          * notifications are not supported
 521          */
 522         if (!(mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_ASYNC_DTM))
 523                 iwl_mvm_tt_temp_changed(mvm,
 524                                 le32_to_cpu(stats->general.radio_temperature));
 525
 526         iwl_mvm_update_rx_statistics(mvm, stats);
 527
 528         ieee80211_iterate_active_interfaces(mvm->hw,
 529                                             IEEE80211_IFACE_ITER_NORMAL,
 530                                             iwl_mvm_stat_iterator,
 531                                             &data);
 532         return 0;
 533 }