drivers/net/wireless/intel/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 - 2015 Intel Mobile Communications GmbH
  10  * Copyright(c) 2016 Intel Deutschland GmbH
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of version 2 of the GNU General Public License as
  14  * published by the Free Software Foundation.
  15  *
  16  * This program is distributed in the hope that it will be useful, but
  17  * WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  * General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  24  * USA
  25  *
  26  * The full GNU General Public License is included in this distribution
  27  * in the file called COPYING.
  28  *
  29  * Contact Information:
  30  *  Intel Linux Wireless <linuxwifi@intel.com>
  31  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  32  *
  33  * BSD LICENSE
  34  *
  35  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  36  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
  37  * All rights reserved.
  38  *
  39  * Redistribution and use in source and binary forms, with or without
  40  * modification, are permitted provided that the following conditions
  41  * are met:
  42  *
  43  *  * Redistributions of source code must retain the above copyright
  44  *    notice, this list of conditions and the following disclaimer.
  45  *  * Redistributions in binary form must reproduce the above copyright
  46  *    notice, this list of conditions and the following disclaimer in
  47  *    the documentation and/or other materials provided with the
  48  *    distribution.
  49  *  * Neither the name Intel Corporation nor the names of its
  50  *    contributors may be used to endorse or promote products derived
  51  *    from this software without specific prior written permission.
  52  *
  53  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  54  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  55  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  56  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  57  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  58  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  59  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  60  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  61  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  62  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  63  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  64  *****************************************************************************/
  65 #include <linux/etherdevice.h>
  66 #include <linux/skbuff.h>
  67 #include "iwl-trans.h"
  68 #include "mvm.h"
  69 #include "fw-api.h"
  70 #include "fw-dbg.h"
  71
  72 /*
  73  * iwl_mvm_rx_rx_phy_cmd - REPLY_RX_PHY_CMD handler
  74  *
  75  * Copies the phy information in mvm->last_phy_info, it will be used when the
  76  * actual data will come from the fw in the next packet.
  77  */
  78 void iwl_mvm_rx_rx_phy_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
  79 {
  80         struct iwl_rx_packet *pkt = rxb_addr(rxb);
  81
  82         memcpy(&mvm->last_phy_info, pkt->data, sizeof(mvm->last_phy_info));
  83         mvm->ampdu_ref++;
  84
  85 #ifdef CONFIG_IWLWIFI_DEBUGFS
  86         if (mvm->last_phy_info.phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
  87                 spin_lock(&mvm->drv_stats_lock);
  88                 mvm->drv_rx_stats.ampdu_count++;
  89                 spin_unlock(&mvm->drv_stats_lock);
  90         }
  91 #endif
  92 }
  93
  94 /*
  95  * iwl_mvm_pass_packet_to_mac80211 - builds the packet for mac80211
  96  *
  97  * Adds the rxb to a new skb and give it to mac80211
  98  */
  99 static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm,
 100                                             struct ieee80211_sta *sta,
 101                                             struct napi_struct *napi,
 102                                             struct sk_buff *skb,
 103                                             struct ieee80211_hdr *hdr, u16 len,
 104                                             u8 crypt_len,
 105                                             struct iwl_rx_cmd_buffer *rxb)
 106 {
 107         unsigned int hdrlen, fraglen;
 108
 109         /* If frame is small enough to fit in skb->head, pull it completely.
 110          * If not, only pull ieee80211_hdr (including crypto if present, and
 111          * an additional 8 bytes for SNAP/ethertype, see below) so that
 112          * splice() or TCP coalesce are more efficient.
 113          *
 114          * Since, in addition, ieee80211_data_to_8023() always pull in at
 115          * least 8 bytes (possibly more for mesh) we can do the same here
 116          * to save the cost of doing it later. That still doesn't pull in
 117          * the actual IP header since the typical case has a SNAP header.
 118          * If the latter changes (there are efforts in the standards group
 119          * to do so) we should revisit this and ieee80211_data_to_8023().
 120          */
 121         hdrlen = (len <= skb_tailroom(skb)) ? len :
 122                                               sizeof(*hdr) + crypt_len + 8;
 123
 124         memcpy(skb_put(skb, hdrlen), hdr, hdrlen);
 125         fraglen = len - hdrlen;
 126
 127         if (fraglen) {
 128                 int offset = (void *)hdr + hdrlen -
 129                              rxb_addr(rxb) + rxb_offset(rxb);
 130
 131                 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
 132                                 fraglen, rxb->truesize);
 133         }
 134
 135         ieee80211_rx_napi(mvm->hw, sta, skb, napi);
 136 }
 137
 138 /*
 139  * iwl_mvm_get_signal_strength - use new rx PHY INFO API
 140  * values are reported by the fw as positive values - need to negate
 141  * to obtain their dBM.  Account for missing antennas by replacing 0
 142  * values by -256dBm: practically 0 power and a non-feasible 8 bit value.
 143  */
 144 static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm,
 145                                         struct iwl_rx_phy_info *phy_info,
 146                                         struct ieee80211_rx_status *rx_status)
 147 {
 148         int energy_a, energy_b, energy_c, max_energy;
 149         u32 val;
 150
 151         val =
 152             le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_ENERGY_ANT_ABC_IDX]);
 153         energy_a = (val & IWL_RX_INFO_ENERGY_ANT_A_MSK) >>
 154                                                 IWL_RX_INFO_ENERGY_ANT_A_POS;
 155         energy_a = energy_a ? -energy_a : S8_MIN;
 156         energy_b = (val & IWL_RX_INFO_ENERGY_ANT_B_MSK) >>
 157                                                 IWL_RX_INFO_ENERGY_ANT_B_POS;
 158         energy_b = energy_b ? -energy_b : S8_MIN;
 159         energy_c = (val & IWL_RX_INFO_ENERGY_ANT_C_MSK) >>
 160                                                 IWL_RX_INFO_ENERGY_ANT_C_POS;
 161         energy_c = energy_c ? -energy_c : S8_MIN;
 162         max_energy = max(energy_a, energy_b);
 163         max_energy = max(max_energy, energy_c);
 164
 165         IWL_DEBUG_STATS(mvm, "energy In A %d B %d C %d , and max %d\n",
 166                         energy_a, energy_b, energy_c, max_energy);
 167
 168         rx_status->signal = max_energy;
 169         rx_status->chains = (le16_to_cpu(phy_info->phy_flags) &
 170                                 RX_RES_PHY_FLAGS_ANTENNA)
 171                                         >> RX_RES_PHY_FLAGS_ANTENNA_POS;
 172         rx_status->chain_signal[0] = energy_a;
 173         rx_status->chain_signal[1] = energy_b;
 174         rx_status->chain_signal[2] = energy_c;
 175 }
 176
 177 /*
 178  * iwl_mvm_set_mac80211_rx_flag - translate fw status to mac80211 format
 179  * @mvm: the mvm object
 180  * @hdr: 80211 header
 181  * @stats: status in mac80211's format
 182  * @rx_pkt_status: status coming from fw
 183  *
 184  * returns non 0 value if the packet should be dropped
 185  */
 186 static u32 iwl_mvm_set_mac80211_rx_flag(struct iwl_mvm *mvm,
 187                                         struct ieee80211_hdr *hdr,
 188                                         struct ieee80211_rx_status *stats,
 189                                         u32 rx_pkt_status,
 190                                         u8 *crypt_len)
 191 {
 192         if (!ieee80211_has_protected(hdr->frame_control) ||
 193             (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 194                              RX_MPDU_RES_STATUS_SEC_NO_ENC)
 195                 return 0;
 196
 197         /* packet was encrypted with unknown alg */
 198         if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 199                                         RX_MPDU_RES_STATUS_SEC_ENC_ERR)
 200                 return 0;
 201
 202         switch (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) {
 203         case RX_MPDU_RES_STATUS_SEC_CCM_ENC:
 204                 /* alg is CCM: check MIC only */
 205                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
 206                         return -1;
 207
 208                 stats->flag |= RX_FLAG_DECRYPTED;
 209                 *crypt_len = IEEE80211_CCMP_HDR_LEN;
 210                 return 0;
 211
 212         case RX_MPDU_RES_STATUS_SEC_TKIP_ENC:
 213                 /* Don't drop the frame and decrypt it in SW */
 214                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_TTAK_OK))
 215                         return 0;
 216                 *crypt_len = IEEE80211_TKIP_IV_LEN;
 217                 /* fall through if TTAK OK */
 218
 219         case RX_MPDU_RES_STATUS_SEC_WEP_ENC:
 220                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_ICV_OK))
 221                         return -1;
 222
 223                 stats->flag |= RX_FLAG_DECRYPTED;
 224                 if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 225                                 RX_MPDU_RES_STATUS_SEC_WEP_ENC)
 226                         *crypt_len = IEEE80211_WEP_IV_LEN;
 227                 return 0;
 228
 229         case RX_MPDU_RES_STATUS_SEC_EXT_ENC:
 230                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
 231                         return -1;
 232                 stats->flag |= RX_FLAG_DECRYPTED;
 233                 return 0;
 234
 235         default:
 236                 IWL_ERR(mvm, "Unhandled alg: 0x%x\n", rx_pkt_status);
 237         }
 238
 239         return 0;
 240 }
 241
 242 static void iwl_mvm_rx_csum(struct ieee80211_sta *sta,
 243                             struct sk_buff *skb,
 244                             u32 status)
 245 {
 246         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 247         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
 248
 249         if (mvmvif->features & NETIF_F_RXCSUM &&
 250             status & RX_MPDU_RES_STATUS_CSUM_DONE &&
 251             status & RX_MPDU_RES_STATUS_CSUM_OK)
 252                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 253 }
 254
 255 /*
 256  * iwl_mvm_rx_rx_mpdu - REPLY_RX_MPDU_CMD handler
 257  *
 258  * Handles the actual data of the Rx packet from the fw
 259  */
 260 void iwl_mvm_rx_rx_mpdu(struct iwl_mvm *mvm, struct napi_struct *napi,
 261                         struct iwl_rx_cmd_buffer *rxb)
 262 {
 263         struct ieee80211_hdr *hdr;
 264         struct ieee80211_rx_status *rx_status;
 265         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 266         struct iwl_rx_phy_info *phy_info;
 267         struct iwl_rx_mpdu_res_start *rx_res;
 268         struct ieee80211_sta *sta = NULL;
 269         struct sk_buff *skb;
 270         u32 len;
 271         u32 rate_n_flags;
 272         u32 rx_pkt_status;
 273         u8 crypt_len = 0;
 274         bool take_ref;
 275
 276         phy_info = &mvm->last_phy_info;
 277         rx_res = (struct iwl_rx_mpdu_res_start *)pkt->data;
 278         hdr = (struct ieee80211_hdr *)(pkt->data + sizeof(*rx_res));
 279         len = le16_to_cpu(rx_res->byte_count);
 280         rx_pkt_status = le32_to_cpup((__le32 *)
 281                 (pkt->data + sizeof(*rx_res) + len));
 282
 283         /* Dont use dev_alloc_skb(), we'll have enough headroom once
 284          * ieee80211_hdr pulled.
 285          */
 286         skb = alloc_skb(128, GFP_ATOMIC);
 287         if (!skb) {
 288                 IWL_ERR(mvm, "alloc_skb failed\n");
 289                 return;
 290         }
 291
 292         rx_status = IEEE80211_SKB_RXCB(skb);
 293
 294         /*
 295          * drop the packet if it has failed being decrypted by HW
 296          */
 297         if (iwl_mvm_set_mac80211_rx_flag(mvm, hdr, rx_status, rx_pkt_status,
 298                                          &crypt_len)) {
 299                 IWL_DEBUG_DROP(mvm, "Bad decryption results 0x%08x\n",
 300                                rx_pkt_status);
 301                 kfree_skb(skb);
 302                 return;
 303         }
 304
 305         /*
 306          * Keep packets with CRC errors (and with overrun) for monitor mode
 307          * (otherwise the firmware discards them) but mark them as bad.
 308          */
 309         if (!(rx_pkt_status & RX_MPDU_RES_STATUS_CRC_OK) ||
 310             !(rx_pkt_status & RX_MPDU_RES_STATUS_OVERRUN_OK)) {
 311                 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n", rx_pkt_status);
 312                 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
 313         }
 314
 315         /* This will be used in several places later */
 316         rate_n_flags = le32_to_cpu(phy_info->rate_n_flags);
 317
 318         /* rx_status carries information about the packet to mac80211 */
 319         rx_status->mactime = le64_to_cpu(phy_info->timestamp);
 320         rx_status->device_timestamp = le32_to_cpu(phy_info->system_timestamp);
 321         rx_status->band =
 322                 (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_BAND_24)) ?
 323                                 NL80211_BAND_2GHZ : NL80211_BAND_5GHZ;
 324         rx_status->freq =
 325                 ieee80211_channel_to_frequency(le16_to_cpu(phy_info->channel),
 326                                                rx_status->band);
 327
 328         /* TSF as indicated by the firmware  is at INA time */
 329         rx_status->flag |= RX_FLAG_MACTIME_PLCP_START;
 330
 331         iwl_mvm_get_signal_strength(mvm, phy_info, rx_status);
 332
 333         IWL_DEBUG_STATS_LIMIT(mvm, "Rssi %d, TSF %llu\n", rx_status->signal,
 334                               (unsigned long long)rx_status->mactime);
 335
 336         rcu_read_lock();
 337         if (rx_pkt_status & RX_MPDU_RES_STATUS_SRC_STA_FOUND) {
 338                 u32 id = rx_pkt_status & RX_MPDU_RES_STATUS_STA_ID_MSK;
 339
 340                 id >>= RX_MDPU_RES_STATUS_STA_ID_SHIFT;
 341
 342                 if (!WARN_ON_ONCE(id >= IWL_MVM_STATION_COUNT)) {
 343                         sta = rcu_dereference(mvm->fw_id_to_mac_id[id]);
 344                         if (IS_ERR(sta))
 345                                 sta = NULL;
 346                 }
 347         } else if (!is_multicast_ether_addr(hdr->addr2)) {
 348                 /* This is fine since we prevent two stations with the same
 349                  * address from being added.
 350                  */
 351                 sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL);
 352         }
 353
 354         if (sta) {
 355                 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 356                 struct ieee80211_vif *tx_blocked_vif =
 357                         rcu_dereference(mvm->csa_tx_blocked_vif);
 358
 359                 /* We have tx blocked stations (with CS bit). If we heard
 360                  * frames from a blocked station on a new channel we can
 361                  * TX to it again.
 362                  */
 363                 if (unlikely(tx_blocked_vif) &&
 364                     mvmsta->vif == tx_blocked_vif) {
 365                         struct iwl_mvm_vif *mvmvif =
 366                                 iwl_mvm_vif_from_mac80211(tx_blocked_vif);
 367
 368                         if (mvmvif->csa_target_freq == rx_status->freq)
 369                                 iwl_mvm_sta_modify_disable_tx_ap(mvm, sta,
 370                                                                  false);
 371                 }
 372
 373                 rs_update_last_rssi(mvm, &mvmsta->lq_sta, rx_status);
 374
 375                 if (iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_RSSI) &&
 376                     ieee80211_is_beacon(hdr->frame_control)) {
 377                         struct iwl_fw_dbg_trigger_tlv *trig;
 378                         struct iwl_fw_dbg_trigger_low_rssi *rssi_trig;
 379                         bool trig_check;
 380                         s32 rssi;
 381
 382                         trig = iwl_fw_dbg_get_trigger(mvm->fw,
 383                                                       FW_DBG_TRIGGER_RSSI);
 384                         rssi_trig = (void *)trig->data;
 385                         rssi = le32_to_cpu(rssi_trig->rssi);
 386
 387                         trig_check =
 388                                 iwl_fw_dbg_trigger_check_stop(mvm, mvmsta->vif,
 389                                                               trig);
 390                         if (trig_check && rx_status->signal < rssi)
 391                                 iwl_mvm_fw_dbg_collect_trig(mvm, trig, NULL);
 392                 }
 393
 394                 if (ieee80211_is_data(hdr->frame_control))
 395                         iwl_mvm_rx_csum(sta, skb, rx_pkt_status);
 396         }
 397         rcu_read_unlock();
 398
 399         /* set the preamble flag if appropriate */
 400         if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_SHORT_PREAMBLE))
 401                 rx_status->flag |= RX_FLAG_SHORTPRE;
 402
 403         if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
 404                 /*
 405                  * We know which subframes of an A-MPDU belong
 406                  * together since we get a single PHY response
 407                  * from the firmware for all of them
 408                  */
 409                 rx_status->flag |= RX_FLAG_AMPDU_DETAILS;
 410                 rx_status->ampdu_reference = mvm->ampdu_ref;
 411         }
 412
 413         /* Set up the HT phy flags */
 414         switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
 415         case RATE_MCS_CHAN_WIDTH_20:
 416                 break;
 417         case RATE_MCS_CHAN_WIDTH_40:
 418                 rx_status->flag |= RX_FLAG_40MHZ;
 419                 break;
 420         case RATE_MCS_CHAN_WIDTH_80:
 421                 rx_status->vht_flag |= RX_VHT_FLAG_80MHZ;
 422                 break;
 423         case RATE_MCS_CHAN_WIDTH_160:
 424                 rx_status->vht_flag |= RX_VHT_FLAG_160MHZ;
 425                 break;
 426         }
 427         if (rate_n_flags & RATE_MCS_SGI_MSK)
 428                 rx_status->flag |= RX_FLAG_SHORT_GI;
 429         if (rate_n_flags & RATE_HT_MCS_GF_MSK)
 430                 rx_status->flag |= RX_FLAG_HT_GF;
 431         if (rate_n_flags & RATE_MCS_LDPC_MSK)
 432                 rx_status->flag |= RX_FLAG_LDPC;
 433         if (rate_n_flags & RATE_MCS_HT_MSK) {
 434                 u8 stbc = (rate_n_flags & RATE_MCS_HT_STBC_MSK) >>
 435                                 RATE_MCS_STBC_POS;
 436                 rx_status->flag |= RX_FLAG_HT;
 437                 rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
 438                 rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT;
 439         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 440                 u8 stbc = (rate_n_flags & RATE_MCS_VHT_STBC_MSK) >>
 441                                 RATE_MCS_STBC_POS;
 442                 rx_status->vht_nss =
 443                         ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
 444                                                 RATE_VHT_MCS_NSS_POS) + 1;
 445                 rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 446                 rx_status->flag |= RX_FLAG_VHT;
 447                 rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT;
 448                 if (rate_n_flags & RATE_MCS_BF_MSK)
 449                         rx_status->vht_flag |= RX_VHT_FLAG_BF;
 450         } else {
 451                 rx_status->rate_idx =
 452                         iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
 453                                                             rx_status->band);
 454         }
 455
 456 #ifdef CONFIG_IWLWIFI_DEBUGFS
 457         iwl_mvm_update_frame_stats(mvm, rate_n_flags,
 458                                    rx_status->flag & RX_FLAG_AMPDU_DETAILS);
 459 #endif
 460
 461         if (unlikely((ieee80211_is_beacon(hdr->frame_control) ||
 462                       ieee80211_is_probe_resp(hdr->frame_control)) &&
 463                      mvm->sched_scan_pass_all == SCHED_SCAN_PASS_ALL_ENABLED))
 464                 mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_FOUND;
 465
 466         if (unlikely(ieee80211_is_beacon(hdr->frame_control) ||
 467                      ieee80211_is_probe_resp(hdr->frame_control)))
 468                 rx_status->boottime_ns = ktime_get_boot_ns();
 469
 470         /* Take a reference briefly to kick off a d0i3 entry delay so
 471          * we can handle bursts of RX packets without toggling the
 472          * state too often.  But don't do this for beacons if we are
 473          * going to idle because the beacon filtering changes we make
 474          * cause the firmware to send us collateral beacons. */
 475         take_ref = !(test_bit(STATUS_TRANS_GOING_IDLE, &mvm->trans->status) &&
 476                      ieee80211_is_beacon(hdr->frame_control));
 477
 478         if (take_ref)
 479                 iwl_mvm_ref(mvm, IWL_MVM_REF_RX);
 480
 481         iwl_mvm_pass_packet_to_mac80211(mvm, sta, napi, skb, hdr, len,
 482                                         crypt_len, rxb);
 483
 484         if (take_ref)
 485                 iwl_mvm_unref(mvm, IWL_MVM_REF_RX);
 486 }
 487
 488 static void iwl_mvm_update_rx_statistics(struct iwl_mvm *mvm,
 489                                          struct mvm_statistics_rx *rx_stats)
 490 {
 491         lockdep_assert_held(&mvm->mutex);
 492
 493         mvm->rx_stats = *rx_stats;
 494 }
 495
 496 struct iwl_mvm_stat_data {
 497         struct iwl_mvm *mvm;
 498         __le32 mac_id;
 499         u8 beacon_filter_average_energy;
 500         struct mvm_statistics_general_v8 *general;
 501         struct mvm_statistics_load *load;
 502 };
 503
 504 static void iwl_mvm_stat_iterator(void *_data, u8 *mac,
 505                                   struct ieee80211_vif *vif)
 506 {
 507         struct iwl_mvm_stat_data *data = _data;
 508         struct iwl_mvm *mvm = data->mvm;
 509         int sig = -data->beacon_filter_average_energy;
 510         int last_event;
 511         int thold = vif->bss_conf.cqm_rssi_thold;
 512         int hyst = vif->bss_conf.cqm_rssi_hyst;
 513         u16 id = le32_to_cpu(data->mac_id);
 514         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 515
 516         /* This doesn't need the MAC ID check since it's not taking the
 517          * data copied into the "data" struct, but rather the data from
 518          * the notification directly.
 519          */
 520         if (data->general) {
 521                 mvmvif->beacon_stats.num_beacons =
 522                         le32_to_cpu(data->general->beacon_counter[mvmvif->id]);
 523                 mvmvif->beacon_stats.avg_signal =
 524                         -data->general->beacon_average_energy[mvmvif->id];
 525         }
 526
 527         if (mvmvif->id != id)
 528                 return;
 529
 530         if (vif->type != NL80211_IFTYPE_STATION)
 531                 return;
 532
 533         if (sig == 0) {
 534                 IWL_DEBUG_RX(mvm, "RSSI is 0 - skip signal based decision\n");
 535                 return;
 536         }
 537
 538         mvmvif->bf_data.ave_beacon_signal = sig;
 539
 540         /* BT Coex */
 541         if (mvmvif->bf_data.bt_coex_min_thold !=
 542             mvmvif->bf_data.bt_coex_max_thold) {
 543                 last_event = mvmvif->bf_data.last_bt_coex_event;
 544                 if (sig > mvmvif->bf_data.bt_coex_max_thold &&
 545                     (last_event <= mvmvif->bf_data.bt_coex_min_thold ||
 546                      last_event == 0)) {
 547                         mvmvif->bf_data.last_bt_coex_event = sig;
 548                         IWL_DEBUG_RX(mvm, "cqm_iterator bt coex high %d\n",
 549                                      sig);
 550                         iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_HIGH);
 551                 } else if (sig < mvmvif->bf_data.bt_coex_min_thold &&
 552                            (last_event >= mvmvif->bf_data.bt_coex_max_thold ||
 553                             last_event == 0)) {
 554                         mvmvif->bf_data.last_bt_coex_event = sig;
 555                         IWL_DEBUG_RX(mvm, "cqm_iterator bt coex low %d\n",
 556                                      sig);
 557                         iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_LOW);
 558                 }
 559         }
 560
 561         if (!(vif->driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI))
 562                 return;
 563
 564         /* CQM Notification */
 565         last_event = mvmvif->bf_data.last_cqm_event;
 566         if (thold && sig < thold && (last_event == 0 ||
 567                                      sig < last_event - hyst)) {
 568                 mvmvif->bf_data.last_cqm_event = sig;
 569                 IWL_DEBUG_RX(mvm, "cqm_iterator cqm low %d\n",
 570                              sig);
 571                 ieee80211_cqm_rssi_notify(
 572                         vif,
 573                         NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
 574                         GFP_KERNEL);
 575         } else if (sig > thold &&
 576                    (last_event == 0 || sig > last_event + hyst)) {
 577                 mvmvif->bf_data.last_cqm_event = sig;
 578                 IWL_DEBUG_RX(mvm, "cqm_iterator cqm high %d\n",
 579                              sig);
 580                 ieee80211_cqm_rssi_notify(
 581                         vif,
 582                         NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
 583                         GFP_KERNEL);
 584         }
 585 }
 586
 587 static inline void
 588 iwl_mvm_rx_stats_check_trigger(struct iwl_mvm *mvm, struct iwl_rx_packet *pkt)
 589 {
 590         struct iwl_fw_dbg_trigger_tlv *trig;
 591         struct iwl_fw_dbg_trigger_stats *trig_stats;
 592         u32 trig_offset, trig_thold;
 593
 594         if (!iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_STATS))
 595                 return;
 596
 597         trig = iwl_fw_dbg_get_trigger(mvm->fw, FW_DBG_TRIGGER_STATS);
 598         trig_stats = (void *)trig->data;
 599
 600         if (!iwl_fw_dbg_trigger_check_stop(mvm, NULL, trig))
 601                 return;
 602
 603         trig_offset = le32_to_cpu(trig_stats->stop_offset);
 604         trig_thold = le32_to_cpu(trig_stats->stop_threshold);
 605
 606         if (WARN_ON_ONCE(trig_offset >= iwl_rx_packet_payload_len(pkt)))
 607                 return;
 608
 609         if (le32_to_cpup((__le32 *) (pkt->data + trig_offset)) < trig_thold)
 610                 return;
 611
 612         iwl_mvm_fw_dbg_collect_trig(mvm, trig, NULL);
 613 }
 614
 615 void iwl_mvm_handle_rx_statistics(struct iwl_mvm *mvm,
 616                                   struct iwl_rx_packet *pkt)
 617 {
 618         struct iwl_notif_statistics_v11 *stats = (void *)&pkt->data;
 619         struct iwl_mvm_stat_data data = {
 620                 .mvm = mvm,
 621         };
 622         int expected_size = iwl_mvm_has_new_rx_api(mvm) ? sizeof(*stats) :
 623                             sizeof(struct iwl_notif_statistics_v10);
 624         u32 temperature;
 625
 626         if (iwl_rx_packet_payload_len(pkt) != expected_size)
 627                 goto invalid;
 628
 629         temperature = le32_to_cpu(stats->general.radio_temperature);
 630         data.mac_id = stats->rx.general.mac_id;
 631         data.beacon_filter_average_energy =
 632                 stats->general.beacon_filter_average_energy;
 633
 634         iwl_mvm_update_rx_statistics(mvm, &stats->rx);
 635
 636         mvm->radio_stats.rx_time = le64_to_cpu(stats->general.rx_time);
 637         mvm->radio_stats.tx_time = le64_to_cpu(stats->general.tx_time);
 638         mvm->radio_stats.on_time_rf =
 639                 le64_to_cpu(stats->general.on_time_rf);
 640         mvm->radio_stats.on_time_scan =
 641                 le64_to_cpu(stats->general.on_time_scan);
 642
 643         data.general = &stats->general;
 644         if (iwl_mvm_has_new_rx_api(mvm)) {
 645                 int i;
 646
 647                 data.load = &stats->load_stats;
 648
 649                 rcu_read_lock();
 650                 for (i = 0; i < IWL_MVM_STATION_COUNT; i++) {
 651                         struct iwl_mvm_sta *sta;
 652
 653                         if (!data.load->avg_energy[i])
 654                                 continue;
 655
 656                         sta = iwl_mvm_sta_from_staid_rcu(mvm, i);
 657                         if (!sta)
 658                                 continue;
 659                         sta->avg_energy = data.load->avg_energy[i];
 660                 }
 661                 rcu_read_unlock();
 662         }
 663
 664         iwl_mvm_rx_stats_check_trigger(mvm, pkt);
 665
 666         ieee80211_iterate_active_interfaces(mvm->hw,
 667                                             IEEE80211_IFACE_ITER_NORMAL,
 668                                             iwl_mvm_stat_iterator,
 669                                             &data);
 670         return;
 671  invalid:
 672         IWL_ERR(mvm, "received invalid statistics size (%d)!\n",
 673                 iwl_rx_packet_payload_len(pkt));
 674 }
 675
 676 void iwl_mvm_rx_statistics(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
 677 {
 678         iwl_mvm_handle_rx_statistics(mvm, rxb_addr(rxb));
 679 }
 680
 681 void iwl_mvm_window_status_notif(struct iwl_mvm *mvm,
 682                                  struct iwl_rx_cmd_buffer *rxb)
 683 {
 684         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 685         struct iwl_ba_window_status_notif *notif = (void *)pkt->data;
 686         int i;
 687         u32 pkt_len = iwl_rx_packet_payload_len(pkt);
 688
 689         if (WARN_ONCE(pkt_len != sizeof(*notif),
 690                       "Received window status notification of wrong size (%u)\n",
 691                       pkt_len))
 692                 return;
 693
 694         rcu_read_lock();
 695         for (i = 0; i < BA_WINDOW_STREAMS_MAX; i++) {
 696                 struct ieee80211_sta *sta;
 697                 u8 sta_id, tid;
 698                 u64 bitmap;
 699                 u32 ssn;
 700                 u16 ratid;
 701                 u16 received_mpdu;
 702
 703                 ratid = le16_to_cpu(notif->ra_tid[i]);
 704                 /* check that this TID is valid */
 705                 if (!(ratid & BA_WINDOW_STATUS_VALID_MSK))
 706                         continue;
 707
 708                 received_mpdu = le16_to_cpu(notif->mpdu_rx_count[i]);
 709                 if (received_mpdu == 0)
 710                         continue;
 711
 712                 tid = ratid & BA_WINDOW_STATUS_TID_MSK;
 713                 /* get the station */
 714                 sta_id = (ratid & BA_WINDOW_STATUS_STA_ID_MSK)
 715                          >> BA_WINDOW_STATUS_STA_ID_POS;
 716                 sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
 717                 if (IS_ERR_OR_NULL(sta))
 718                         continue;
 719                 bitmap = le64_to_cpu(notif->bitmap[i]);
 720                 ssn = le32_to_cpu(notif->start_seq_num[i]);
 721
 722                 /* update mac80211 with the bitmap for the reordering buffer */
 723                 ieee80211_mark_rx_ba_filtered_frames(sta, tid, ssn, bitmap,
 724                                                      received_mpdu);
 725         }
 726         rcu_read_unlock();
 727 }