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  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of version 2 of the GNU General Public License as
  12  * published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  22  * USA
  23  *
  24  * The full GNU General Public License is included in this distribution
  25  * in the file called COPYING.
  26  *
  27  * Contact Information:
  28  *  Intel Linux Wireless <ilw@linux.intel.com>
  29  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  30  *
  31  * BSD LICENSE
  32  *
  33  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  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 #include "iwl-trans.h"
  63
  64 #include "mvm.h"
  65 #include "fw-api.h"
  66
  67 /*
  68  * iwl_mvm_rx_rx_phy_cmd - REPLY_RX_PHY_CMD handler
  69  *
  70  * Copies the phy information in mvm->last_phy_info, it will be used when the
  71  * actual data will come from the fw in the next packet.
  72  */
  73 int iwl_mvm_rx_rx_phy_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
  74                           struct iwl_device_cmd *cmd)
  75 {
  76         struct iwl_rx_packet *pkt = rxb_addr(rxb);
  77
  78         memcpy(&mvm->last_phy_info, pkt->data, sizeof(mvm->last_phy_info));
  79         mvm->ampdu_ref++;
  80
  81 #ifdef CONFIG_IWLWIFI_DEBUGFS
  82         if (mvm->last_phy_info.phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
  83                 spin_lock(&mvm->drv_stats_lock);
  84                 mvm->drv_rx_stats.ampdu_count++;
  85                 spin_unlock(&mvm->drv_stats_lock);
  86         }
  87 #endif
  88
  89         return 0;
  90 }
  91
  92 /*
  93  * iwl_mvm_pass_packet_to_mac80211 - builds the packet for mac80211
  94  *
  95  * Adds the rxb to a new skb and give it to mac80211
  96  */
  97 static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm,
  98                                             struct ieee80211_hdr *hdr, u16 len,
  99                                             u32 ampdu_status,
 100                                             struct iwl_rx_cmd_buffer *rxb,
 101                                             struct ieee80211_rx_status *stats)
 102 {
 103         struct sk_buff *skb;
 104         unsigned int hdrlen, fraglen;
 105
 106         /* Dont use dev_alloc_skb(), we'll have enough headroom once
 107          * ieee80211_hdr pulled.
 108          */
 109         skb = alloc_skb(128, GFP_ATOMIC);
 110         if (!skb) {
 111                 IWL_ERR(mvm, "alloc_skb failed\n");
 112                 return;
 113         }
 114         /* If frame is small enough to fit in skb->head, pull it completely.
 115          * If not, only pull ieee80211_hdr so that splice() or TCP coalesce
 116          * are more efficient.
 117          */
 118         hdrlen = (len <= skb_tailroom(skb)) ? len : sizeof(*hdr);
 119
 120         memcpy(skb_put(skb, hdrlen), hdr, hdrlen);
 121         fraglen = len - hdrlen;
 122
 123         if (fraglen) {
 124                 int offset = (void *)hdr + hdrlen -
 125                              rxb_addr(rxb) + rxb_offset(rxb);
 126
 127                 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
 128                                 fraglen, rxb->truesize);
 129         }
 130
 131         memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));
 132
 133         ieee80211_rx_ni(mvm->hw, skb);
 134 }
 135
 136 static void iwl_mvm_calc_rssi(struct iwl_mvm *mvm,
 137                               struct iwl_rx_phy_info *phy_info,
 138                               struct ieee80211_rx_status *rx_status)
 139 {
 140         int rssi_a, rssi_b, rssi_a_dbm, rssi_b_dbm, max_rssi_dbm;
 141         u32 agc_a, agc_b;
 142         u32 val;
 143
 144         val = le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_AGC_IDX]);
 145         agc_a = (val & IWL_OFDM_AGC_A_MSK) >> IWL_OFDM_AGC_A_POS;
 146         agc_b = (val & IWL_OFDM_AGC_B_MSK) >> IWL_OFDM_AGC_B_POS;
 147
 148         val = le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_RSSI_AB_IDX]);
 149         rssi_a = (val & IWL_OFDM_RSSI_INBAND_A_MSK) >> IWL_OFDM_RSSI_A_POS;
 150         rssi_b = (val & IWL_OFDM_RSSI_INBAND_B_MSK) >> IWL_OFDM_RSSI_B_POS;
 151
 152         /*
 153          * dBm = rssi dB - agc dB - constant.
 154          * Higher AGC (higher radio gain) means lower signal.
 155          */
 156         rssi_a_dbm = rssi_a - IWL_RSSI_OFFSET - agc_a;
 157         rssi_b_dbm = rssi_b - IWL_RSSI_OFFSET - agc_b;
 158         max_rssi_dbm = max_t(int, rssi_a_dbm, rssi_b_dbm);
 159
 160         IWL_DEBUG_STATS(mvm, "Rssi In A %d B %d Max %d AGCA %d AGCB %d\n",
 161                         rssi_a_dbm, rssi_b_dbm, max_rssi_dbm, agc_a, agc_b);
 162
 163         rx_status->signal = max_rssi_dbm;
 164         rx_status->chains = (le16_to_cpu(phy_info->phy_flags) &
 165                                 RX_RES_PHY_FLAGS_ANTENNA)
 166                                         >> RX_RES_PHY_FLAGS_ANTENNA_POS;
 167         rx_status->chain_signal[0] = rssi_a_dbm;
 168         rx_status->chain_signal[1] = rssi_b_dbm;
 169 }
 170
 171 /*
 172  * iwl_mvm_get_signal_strength - use new rx PHY INFO API
 173  * values are reported by the fw as positive values - need to negate
 174  * to obtain their dBM.  Account for missing antennas by replacing 0
 175  * values by -256dBm: practically 0 power and a non-feasible 8 bit value.
 176  */
 177 static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm,
 178                                         struct iwl_rx_phy_info *phy_info,
 179                                         struct ieee80211_rx_status *rx_status)
 180 {
 181         int energy_a, energy_b, energy_c, max_energy;
 182         u32 val;
 183
 184         val =
 185             le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_ENERGY_ANT_ABC_IDX]);
 186         energy_a = (val & IWL_RX_INFO_ENERGY_ANT_A_MSK) >>
 187                                                 IWL_RX_INFO_ENERGY_ANT_A_POS;
 188         energy_a = energy_a ? -energy_a : -256;
 189         energy_b = (val & IWL_RX_INFO_ENERGY_ANT_B_MSK) >>
 190                                                 IWL_RX_INFO_ENERGY_ANT_B_POS;
 191         energy_b = energy_b ? -energy_b : -256;
 192         energy_c = (val & IWL_RX_INFO_ENERGY_ANT_C_MSK) >>
 193                                                 IWL_RX_INFO_ENERGY_ANT_C_POS;
 194         energy_c = energy_c ? -energy_c : -256;
 195         max_energy = max(energy_a, energy_b);
 196         max_energy = max(max_energy, energy_c);
 197
 198         IWL_DEBUG_STATS(mvm, "energy In A %d B %d C %d , and max %d\n",
 199                         energy_a, energy_b, energy_c, max_energy);
 200
 201         rx_status->signal = max_energy;
 202         rx_status->chains = (le16_to_cpu(phy_info->phy_flags) &
 203                                 RX_RES_PHY_FLAGS_ANTENNA)
 204                                         >> RX_RES_PHY_FLAGS_ANTENNA_POS;
 205         rx_status->chain_signal[0] = energy_a;
 206         rx_status->chain_signal[1] = energy_b;
 207         rx_status->chain_signal[2] = energy_c;
 208 }
 209
 210 /*
 211  * iwl_mvm_set_mac80211_rx_flag - translate fw status to mac80211 format
 212  * @mvm: the mvm object
 213  * @hdr: 80211 header
 214  * @stats: status in mac80211's format
 215  * @rx_pkt_status: status coming from fw
 216  *
 217  * returns non 0 value if the packet should be dropped
 218  */
 219 static u32 iwl_mvm_set_mac80211_rx_flag(struct iwl_mvm *mvm,
 220                                         struct ieee80211_hdr *hdr,
 221                                         struct ieee80211_rx_status *stats,
 222                                         u32 rx_pkt_status)
 223 {
 224         if (!ieee80211_has_protected(hdr->frame_control) ||
 225             (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 226                              RX_MPDU_RES_STATUS_SEC_NO_ENC)
 227                 return 0;
 228
 229         /* packet was encrypted with unknown alg */
 230         if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 231                                         RX_MPDU_RES_STATUS_SEC_ENC_ERR)
 232                 return 0;
 233
 234         switch (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) {
 235         case RX_MPDU_RES_STATUS_SEC_CCM_ENC:
 236                 /* alg is CCM: check MIC only */
 237                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
 238                         return -1;
 239
 240                 stats->flag |= RX_FLAG_DECRYPTED;
 241                 IWL_DEBUG_WEP(mvm, "hw decrypted CCMP successfully\n");
 242                 return 0;
 243
 244         case RX_MPDU_RES_STATUS_SEC_TKIP_ENC:
 245                 /* Don't drop the frame and decrypt it in SW */
 246                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_TTAK_OK))
 247                         return 0;
 248                 /* fall through if TTAK OK */
 249
 250         case RX_MPDU_RES_STATUS_SEC_WEP_ENC:
 251                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_ICV_OK))
 252                         return -1;
 253
 254                 stats->flag |= RX_FLAG_DECRYPTED;
 255                 return 0;
 256
 257         case RX_MPDU_RES_STATUS_SEC_EXT_ENC:
 258                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
 259                         return -1;
 260                 stats->flag |= RX_FLAG_DECRYPTED;
 261                 return 0;
 262
 263         default:
 264                 IWL_ERR(mvm, "Unhandled alg: 0x%x\n", rx_pkt_status);
 265         }
 266
 267         return 0;
 268 }
 269
 270 /*
 271  * iwl_mvm_rx_rx_mpdu - REPLY_RX_MPDU_CMD handler
 272  *
 273  * Handles the actual data of the Rx packet from the fw
 274  */
 275 int iwl_mvm_rx_rx_mpdu(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 276                        struct iwl_device_cmd *cmd)
 277 {
 278         struct ieee80211_hdr *hdr;
 279         struct ieee80211_rx_status rx_status = {};
 280         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 281         struct iwl_rx_phy_info *phy_info;
 282         struct iwl_rx_mpdu_res_start *rx_res;
 283         u32 len;
 284         u32 ampdu_status;
 285         u32 rate_n_flags;
 286         u32 rx_pkt_status;
 287
 288         phy_info = &mvm->last_phy_info;
 289         rx_res = (struct iwl_rx_mpdu_res_start *)pkt->data;
 290         hdr = (struct ieee80211_hdr *)(pkt->data + sizeof(*rx_res));
 291         len = le16_to_cpu(rx_res->byte_count);
 292         rx_pkt_status = le32_to_cpup((__le32 *)
 293                 (pkt->data + sizeof(*rx_res) + len));
 294
 295         memset(&rx_status, 0, sizeof(rx_status));
 296
 297         /*
 298          * drop the packet if it has failed being decrypted by HW
 299          */
 300         if (iwl_mvm_set_mac80211_rx_flag(mvm, hdr, &rx_status, rx_pkt_status)) {
 301                 IWL_DEBUG_DROP(mvm, "Bad decryption results 0x%08x\n",
 302                                rx_pkt_status);
 303                 return 0;
 304         }
 305
 306         if ((unlikely(phy_info->cfg_phy_cnt > 20))) {
 307                 IWL_DEBUG_DROP(mvm, "dsp size out of range [0,20]: %d\n",
 308                                phy_info->cfg_phy_cnt);
 309                 return 0;
 310         }
 311
 312         /*
 313          * Keep packets with CRC errors (and with overrun) for monitor mode
 314          * (otherwise the firmware discards them) but mark them as bad.
 315          */
 316         if (!(rx_pkt_status & RX_MPDU_RES_STATUS_CRC_OK) ||
 317             !(rx_pkt_status & RX_MPDU_RES_STATUS_OVERRUN_OK)) {
 318                 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n", rx_pkt_status);
 319                 rx_status.flag |= RX_FLAG_FAILED_FCS_CRC;
 320         }
 321
 322         /* This will be used in several places later */
 323         rate_n_flags = le32_to_cpu(phy_info->rate_n_flags);
 324
 325         /* rx_status carries information about the packet to mac80211 */
 326         rx_status.mactime = le64_to_cpu(phy_info->timestamp);
 327         rx_status.device_timestamp = le32_to_cpu(phy_info->system_timestamp);
 328         rx_status.band =
 329                 (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_BAND_24)) ?
 330                                 IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
 331         rx_status.freq =
 332                 ieee80211_channel_to_frequency(le16_to_cpu(phy_info->channel),
 333                                                rx_status.band);
 334         /*
 335          * TSF as indicated by the fw is at INA time, but mac80211 expects the
 336          * TSF at the beginning of the MPDU.
 337          */
 338         /*rx_status.flag |= RX_FLAG_MACTIME_MPDU;*/
 339
 340         if (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_RX_ENERGY_API)
 341                 iwl_mvm_get_signal_strength(mvm, phy_info, &rx_status);
 342         else
 343                 iwl_mvm_calc_rssi(mvm, phy_info, &rx_status);
 344
 345         IWL_DEBUG_STATS_LIMIT(mvm, "Rssi %d, TSF %llu\n", rx_status.signal,
 346                               (unsigned long long)rx_status.mactime);
 347
 348         /* set the preamble flag if appropriate */
 349         if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_SHORT_PREAMBLE))
 350                 rx_status.flag |= RX_FLAG_SHORTPRE;
 351
 352         if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
 353                 /*
 354                  * We know which subframes of an A-MPDU belong
 355                  * together since we get a single PHY response
 356                  * from the firmware for all of them
 357                  */
 358                 rx_status.flag |= RX_FLAG_AMPDU_DETAILS;
 359                 rx_status.ampdu_reference = mvm->ampdu_ref;
 360         }
 361
 362         /* Set up the HT phy flags */
 363         switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
 364         case RATE_MCS_CHAN_WIDTH_20:
 365                 break;
 366         case RATE_MCS_CHAN_WIDTH_40:
 367                 rx_status.flag |= RX_FLAG_40MHZ;
 368                 break;
 369         case RATE_MCS_CHAN_WIDTH_80:
 370                 rx_status.vht_flag |= RX_VHT_FLAG_80MHZ;
 371                 break;
 372         case RATE_MCS_CHAN_WIDTH_160:
 373                 rx_status.vht_flag |= RX_VHT_FLAG_160MHZ;
 374                 break;
 375         }
 376         if (rate_n_flags & RATE_MCS_SGI_MSK)
 377                 rx_status.flag |= RX_FLAG_SHORT_GI;
 378         if (rate_n_flags & RATE_HT_MCS_GF_MSK)
 379                 rx_status.flag |= RX_FLAG_HT_GF;
 380         if (rate_n_flags & RATE_MCS_LDPC_MSK)
 381                 rx_status.flag |= RX_FLAG_LDPC;
 382         if (rate_n_flags & RATE_MCS_HT_MSK) {
 383                 u8 stbc = (rate_n_flags & RATE_MCS_HT_STBC_MSK) >>
 384                                 RATE_MCS_STBC_POS;
 385                 rx_status.flag |= RX_FLAG_HT;
 386                 rx_status.rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
 387                 rx_status.flag |= stbc << RX_FLAG_STBC_SHIFT;
 388         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 389                 u8 stbc = (rate_n_flags & RATE_MCS_VHT_STBC_MSK) >>
 390                                 RATE_MCS_STBC_POS;
 391                 rx_status.vht_nss =
 392                         ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
 393                                                 RATE_VHT_MCS_NSS_POS) + 1;
 394                 rx_status.rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 395                 rx_status.flag |= RX_FLAG_VHT;
 396                 rx_status.flag |= stbc << RX_FLAG_STBC_SHIFT;
 397         } else {
 398                 rx_status.rate_idx =
 399                         iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
 400                                                             rx_status.band);
 401         }
 402
 403 #ifdef CONFIG_IWLWIFI_DEBUGFS
 404         iwl_mvm_update_frame_stats(mvm, &mvm->drv_rx_stats, rate_n_flags,
 405                                    rx_status.flag & RX_FLAG_AMPDU_DETAILS);
 406 #endif
 407         iwl_mvm_pass_packet_to_mac80211(mvm, hdr, len, ampdu_status,
 408                                         rxb, &rx_status);
 409         return 0;
 410 }
 411
 412 static void iwl_mvm_update_rx_statistics(struct iwl_mvm *mvm,
 413                                          struct iwl_notif_statistics *stats)
 414 {
 415         /*
 416          * NOTE FW aggregates the statistics - BUT the statistics are cleared
 417          * when the driver issues REPLY_STATISTICS_CMD 0x9c with CLEAR_STATS
 418          * bit set.
 419          */
 420         lockdep_assert_held(&mvm->mutex);
 421         memcpy(&mvm->rx_stats, &stats->rx, sizeof(struct mvm_statistics_rx));
 422 }
 423
 424 struct iwl_mvm_stat_data {
 425         struct iwl_notif_statistics *stats;
 426         struct iwl_mvm *mvm;
 427 };
 428
 429 static void iwl_mvm_stat_iterator(void *_data, u8 *mac,
 430                                   struct ieee80211_vif *vif)
 431 {
 432         struct iwl_mvm_stat_data *data = _data;
 433         struct iwl_notif_statistics *stats = data->stats;
 434         struct iwl_mvm *mvm = data->mvm;
 435         int sig = -stats->general.beacon_filter_average_energy;
 436         int last_event;
 437         int thold = vif->bss_conf.cqm_rssi_thold;
 438         int hyst = vif->bss_conf.cqm_rssi_hyst;
 439         u16 id = le32_to_cpu(stats->rx.general.mac_id);
 440         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 441
 442         if (mvmvif->id != id)
 443                 return;
 444
 445         if (vif->type != NL80211_IFTYPE_STATION)
 446                 return;
 447
 448         mvmvif->bf_data.ave_beacon_signal = sig;
 449
 450         /* BT Coex */
 451         if (mvmvif->bf_data.bt_coex_min_thold !=
 452             mvmvif->bf_data.bt_coex_max_thold) {
 453                 last_event = mvmvif->bf_data.last_bt_coex_event;
 454                 if (sig > mvmvif->bf_data.bt_coex_max_thold &&
 455                     (last_event <= mvmvif->bf_data.bt_coex_min_thold ||
 456                      last_event == 0)) {
 457                         mvmvif->bf_data.last_bt_coex_event = sig;
 458                         IWL_DEBUG_RX(mvm, "cqm_iterator bt coex high %d\n",
 459                                      sig);
 460                         iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_HIGH);
 461                 } else if (sig < mvmvif->bf_data.bt_coex_min_thold &&
 462                            (last_event >= mvmvif->bf_data.bt_coex_max_thold ||
 463                             last_event == 0)) {
 464                         mvmvif->bf_data.last_bt_coex_event = sig;
 465                         IWL_DEBUG_RX(mvm, "cqm_iterator bt coex low %d\n",
 466                                      sig);
 467                         iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_LOW);
 468                 }
 469         }
 470
 471         if (!(vif->driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI))
 472                 return;
 473
 474         /* CQM Notification */
 475         last_event = mvmvif->bf_data.last_cqm_event;
 476         if (thold && sig < thold && (last_event == 0 ||
 477                                      sig < last_event - hyst)) {
 478                 mvmvif->bf_data.last_cqm_event = sig;
 479                 IWL_DEBUG_RX(mvm, "cqm_iterator cqm low %d\n",
 480                              sig);
 481                 ieee80211_cqm_rssi_notify(
 482                         vif,
 483                         NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
 484                         GFP_KERNEL);
 485         } else if (sig > thold &&
 486                    (last_event == 0 || sig > last_event + hyst)) {
 487                 mvmvif->bf_data.last_cqm_event = sig;
 488                 IWL_DEBUG_RX(mvm, "cqm_iterator cqm high %d\n",
 489                              sig);
 490                 ieee80211_cqm_rssi_notify(
 491                         vif,
 492                         NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
 493                         GFP_KERNEL);
 494         }
 495 }
 496
 497 /*
 498  * iwl_mvm_rx_statistics - STATISTICS_NOTIFICATION handler
 499  *
 500  * TODO: This handler is implemented partially.
 501  */
 502 int iwl_mvm_rx_statistics(struct iwl_mvm *mvm,
 503                           struct iwl_rx_cmd_buffer *rxb,
 504                           struct iwl_device_cmd *cmd)
 505 {
 506         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 507         struct iwl_notif_statistics *stats = (void *)&pkt->data;
 508         struct mvm_statistics_general_common *common = &stats->general.common;
 509         struct iwl_mvm_stat_data data = {
 510                 .stats = stats,
 511                 .mvm = mvm,
 512         };
 513
 514         if (mvm->temperature != le32_to_cpu(common->temperature)) {
 515                 mvm->temperature = le32_to_cpu(common->temperature);
 516                 iwl_mvm_tt_handler(mvm);
 517         }
 518         iwl_mvm_update_rx_statistics(mvm, stats);
 519
 520         ieee80211_iterate_active_interfaces(mvm->hw,
 521                                             IEEE80211_IFACE_ITER_NORMAL,
 522                                             iwl_mvm_stat_iterator,
 523                                             &data);
 524         return 0;
 525 }