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 - 2017 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  *
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  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 <asm/unaligned.h>
  66 #include <linux/etherdevice.h>
  67 #include <linux/skbuff.h>
  68 #include "iwl-trans.h"
  69 #include "mvm.h"
  70 #include "fw-api.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 = ieee80211_hdrlen(hdr->frame_control);
 108         unsigned int fraglen;
 109
 110         /*
 111          * The 'hdrlen' (plus the 8 bytes for the SNAP and the crypt_len,
 112          * but those are all multiples of 4 long) all goes away, but we
 113          * want the *end* of it, which is going to be the start of the IP
 114          * header, to be aligned when it gets pulled in.
 115          * The beginning of the skb->data is aligned on at least a 4-byte
 116          * boundary after allocation. Everything here is aligned at least
 117          * on a 2-byte boundary so we can just take hdrlen & 3 and pad by
 118          * the result.
 119          */
 120         skb_reserve(skb, hdrlen & 3);
 121
 122         /* If frame is small enough to fit in skb->head, pull it completely.
 123          * If not, only pull ieee80211_hdr (including crypto if present, and
 124          * an additional 8 bytes for SNAP/ethertype, see below) so that
 125          * splice() or TCP coalesce are more efficient.
 126          *
 127          * Since, in addition, ieee80211_data_to_8023() always pull in at
 128          * least 8 bytes (possibly more for mesh) we can do the same here
 129          * to save the cost of doing it later. That still doesn't pull in
 130          * the actual IP header since the typical case has a SNAP header.
 131          * If the latter changes (there are efforts in the standards group
 132          * to do so) we should revisit this and ieee80211_data_to_8023().
 133          */
 134         hdrlen = (len <= skb_tailroom(skb)) ? len : hdrlen + crypt_len + 8;
 135
 136         skb_put_data(skb, hdr, hdrlen);
 137         fraglen = len - hdrlen;
 138
 139         if (fraglen) {
 140                 int offset = (void *)hdr + hdrlen -
 141                              rxb_addr(rxb) + rxb_offset(rxb);
 142
 143                 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
 144                                 fraglen, rxb->truesize);
 145         }
 146
 147         ieee80211_rx_napi(mvm->hw, sta, skb, napi);
 148 }
 149
 150 /*
 151  * iwl_mvm_get_signal_strength - use new rx PHY INFO API
 152  * values are reported by the fw as positive values - need to negate
 153  * to obtain their dBM.  Account for missing antennas by replacing 0
 154  * values by -256dBm: practically 0 power and a non-feasible 8 bit value.
 155  */
 156 static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm,
 157                                         struct iwl_rx_phy_info *phy_info,
 158                                         struct ieee80211_rx_status *rx_status)
 159 {
 160         int energy_a, energy_b, energy_c, max_energy;
 161         u32 val;
 162
 163         val =
 164             le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_ENERGY_ANT_ABC_IDX]);
 165         energy_a = (val & IWL_RX_INFO_ENERGY_ANT_A_MSK) >>
 166                                                 IWL_RX_INFO_ENERGY_ANT_A_POS;
 167         energy_a = energy_a ? -energy_a : S8_MIN;
 168         energy_b = (val & IWL_RX_INFO_ENERGY_ANT_B_MSK) >>
 169                                                 IWL_RX_INFO_ENERGY_ANT_B_POS;
 170         energy_b = energy_b ? -energy_b : S8_MIN;
 171         energy_c = (val & IWL_RX_INFO_ENERGY_ANT_C_MSK) >>
 172                                                 IWL_RX_INFO_ENERGY_ANT_C_POS;
 173         energy_c = energy_c ? -energy_c : S8_MIN;
 174         max_energy = max(energy_a, energy_b);
 175         max_energy = max(max_energy, energy_c);
 176
 177         IWL_DEBUG_STATS(mvm, "energy In A %d B %d C %d , and max %d\n",
 178                         energy_a, energy_b, energy_c, max_energy);
 179
 180         rx_status->signal = max_energy;
 181         rx_status->chains = (le16_to_cpu(phy_info->phy_flags) &
 182                                 RX_RES_PHY_FLAGS_ANTENNA)
 183                                         >> RX_RES_PHY_FLAGS_ANTENNA_POS;
 184         rx_status->chain_signal[0] = energy_a;
 185         rx_status->chain_signal[1] = energy_b;
 186         rx_status->chain_signal[2] = energy_c;
 187 }
 188
 189 /*
 190  * iwl_mvm_set_mac80211_rx_flag - translate fw status to mac80211 format
 191  * @mvm: the mvm object
 192  * @hdr: 80211 header
 193  * @stats: status in mac80211's format
 194  * @rx_pkt_status: status coming from fw
 195  *
 196  * returns non 0 value if the packet should be dropped
 197  */
 198 static u32 iwl_mvm_set_mac80211_rx_flag(struct iwl_mvm *mvm,
 199                                         struct ieee80211_hdr *hdr,
 200                                         struct ieee80211_rx_status *stats,
 201                                         u32 rx_pkt_status,
 202                                         u8 *crypt_len)
 203 {
 204         if (!ieee80211_has_protected(hdr->frame_control) ||
 205             (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 206                              RX_MPDU_RES_STATUS_SEC_NO_ENC)
 207                 return 0;
 208
 209         /* packet was encrypted with unknown alg */
 210         if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 211                                         RX_MPDU_RES_STATUS_SEC_ENC_ERR)
 212                 return 0;
 213
 214         switch (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) {
 215         case RX_MPDU_RES_STATUS_SEC_CCM_ENC:
 216                 /* alg is CCM: check MIC only */
 217                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
 218                         return -1;
 219
 220                 stats->flag |= RX_FLAG_DECRYPTED;
 221                 *crypt_len = IEEE80211_CCMP_HDR_LEN;
 222                 return 0;
 223
 224         case RX_MPDU_RES_STATUS_SEC_TKIP_ENC:
 225                 /* Don't drop the frame and decrypt it in SW */
 226                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_TTAK_OK))
 227                         return 0;
 228                 *crypt_len = IEEE80211_TKIP_IV_LEN;
 229                 /* fall through if TTAK OK */
 230
 231         case RX_MPDU_RES_STATUS_SEC_WEP_ENC:
 232                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_ICV_OK))
 233                         return -1;
 234
 235                 stats->flag |= RX_FLAG_DECRYPTED;
 236                 if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 237                                 RX_MPDU_RES_STATUS_SEC_WEP_ENC)
 238                         *crypt_len = IEEE80211_WEP_IV_LEN;
 239                 return 0;
 240
 241         case RX_MPDU_RES_STATUS_SEC_EXT_ENC:
 242                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
 243                         return -1;
 244                 stats->flag |= RX_FLAG_DECRYPTED;
 245                 return 0;
 246
 247         default:
 248                 /* Expected in monitor (not having the keys) */
 249                 if (!mvm->monitor_on)
 250                         IWL_ERR(mvm, "Unhandled alg: 0x%x\n", rx_pkt_status);
 251         }
 252
 253         return 0;
 254 }
 255
 256 static void iwl_mvm_rx_csum(struct ieee80211_sta *sta,
 257                             struct sk_buff *skb,
 258                             u32 status)
 259 {
 260         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 261         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
 262
 263         if (mvmvif->features & NETIF_F_RXCSUM &&
 264             status & RX_MPDU_RES_STATUS_CSUM_DONE &&
 265             status & RX_MPDU_RES_STATUS_CSUM_OK)
 266                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 267 }
 268
 269 /*
 270  * iwl_mvm_rx_rx_mpdu - REPLY_RX_MPDU_CMD handler
 271  *
 272  * Handles the actual data of the Rx packet from the fw
 273  */
 274 void iwl_mvm_rx_rx_mpdu(struct iwl_mvm *mvm, struct napi_struct *napi,
 275                         struct iwl_rx_cmd_buffer *rxb)
 276 {
 277         struct ieee80211_hdr *hdr;
 278         struct ieee80211_rx_status *rx_status;
 279         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 280         struct iwl_rx_phy_info *phy_info;
 281         struct iwl_rx_mpdu_res_start *rx_res;
 282         struct ieee80211_sta *sta = NULL;
 283         struct sk_buff *skb;
 284         u32 len;
 285         u32 rate_n_flags;
 286         u32 rx_pkt_status;
 287         u8 crypt_len = 0;
 288         bool take_ref;
 289
 290         phy_info = &mvm->last_phy_info;
 291         rx_res = (struct iwl_rx_mpdu_res_start *)pkt->data;
 292         hdr = (struct ieee80211_hdr *)(pkt->data + sizeof(*rx_res));
 293         len = le16_to_cpu(rx_res->byte_count);
 294         rx_pkt_status = get_unaligned_le32((__le32 *)
 295                 (pkt->data + sizeof(*rx_res) + len));
 296
 297         /* Dont use dev_alloc_skb(), we'll have enough headroom once
 298          * ieee80211_hdr pulled.
 299          */
 300         skb = alloc_skb(128, GFP_ATOMIC);
 301         if (!skb) {
 302                 IWL_ERR(mvm, "alloc_skb failed\n");
 303                 return;
 304         }
 305
 306         rx_status = IEEE80211_SKB_RXCB(skb);
 307
 308         /*
 309          * drop the packet if it has failed being decrypted by HW
 310          */
 311         if (iwl_mvm_set_mac80211_rx_flag(mvm, hdr, rx_status, rx_pkt_status,
 312                                          &crypt_len)) {
 313                 IWL_DEBUG_DROP(mvm, "Bad decryption results 0x%08x\n",
 314                                rx_pkt_status);
 315                 kfree_skb(skb);
 316                 return;
 317         }
 318
 319         /*
 320          * Keep packets with CRC errors (and with overrun) for monitor mode
 321          * (otherwise the firmware discards them) but mark them as bad.
 322          */
 323         if (!(rx_pkt_status & RX_MPDU_RES_STATUS_CRC_OK) ||
 324             !(rx_pkt_status & RX_MPDU_RES_STATUS_OVERRUN_OK)) {
 325                 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n", rx_pkt_status);
 326                 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
 327         }
 328
 329         /* This will be used in several places later */
 330         rate_n_flags = le32_to_cpu(phy_info->rate_n_flags);
 331
 332         /* rx_status carries information about the packet to mac80211 */
 333         rx_status->mactime = le64_to_cpu(phy_info->timestamp);
 334         rx_status->device_timestamp = le32_to_cpu(phy_info->system_timestamp);
 335         rx_status->band =
 336                 (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_BAND_24)) ?
 337                                 NL80211_BAND_2GHZ : NL80211_BAND_5GHZ;
 338         rx_status->freq =
 339                 ieee80211_channel_to_frequency(le16_to_cpu(phy_info->channel),
 340                                                rx_status->band);
 341
 342         /* TSF as indicated by the firmware  is at INA time */
 343         rx_status->flag |= RX_FLAG_MACTIME_PLCP_START;
 344
 345         iwl_mvm_get_signal_strength(mvm, phy_info, rx_status);
 346
 347         IWL_DEBUG_STATS_LIMIT(mvm, "Rssi %d, TSF %llu\n", rx_status->signal,
 348                               (unsigned long long)rx_status->mactime);
 349
 350         rcu_read_lock();
 351         if (rx_pkt_status & RX_MPDU_RES_STATUS_SRC_STA_FOUND) {
 352                 u32 id = rx_pkt_status & RX_MPDU_RES_STATUS_STA_ID_MSK;
 353
 354                 id >>= RX_MDPU_RES_STATUS_STA_ID_SHIFT;
 355
 356                 if (!WARN_ON_ONCE(id >= ARRAY_SIZE(mvm->fw_id_to_mac_id))) {
 357                         sta = rcu_dereference(mvm->fw_id_to_mac_id[id]);
 358                         if (IS_ERR(sta))
 359                                 sta = NULL;
 360                 }
 361         } else if (!is_multicast_ether_addr(hdr->addr2)) {
 362                 /* This is fine since we prevent two stations with the same
 363                  * address from being added.
 364                  */
 365                 sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL);
 366         }
 367
 368         if (sta) {
 369                 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 370                 struct ieee80211_vif *tx_blocked_vif =
 371                         rcu_dereference(mvm->csa_tx_blocked_vif);
 372
 373                 /* We have tx blocked stations (with CS bit). If we heard
 374                  * frames from a blocked station on a new channel we can
 375                  * TX to it again.
 376                  */
 377                 if (unlikely(tx_blocked_vif) &&
 378                     mvmsta->vif == tx_blocked_vif) {
 379                         struct iwl_mvm_vif *mvmvif =
 380                                 iwl_mvm_vif_from_mac80211(tx_blocked_vif);
 381
 382                         if (mvmvif->csa_target_freq == rx_status->freq)
 383                                 iwl_mvm_sta_modify_disable_tx_ap(mvm, sta,
 384                                                                  false);
 385                 }
 386
 387                 rs_update_last_rssi(mvm, &mvmsta->lq_sta, rx_status);
 388
 389                 if (iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_RSSI) &&
 390                     ieee80211_is_beacon(hdr->frame_control)) {
 391                         struct iwl_fw_dbg_trigger_tlv *trig;
 392                         struct iwl_fw_dbg_trigger_low_rssi *rssi_trig;
 393                         bool trig_check;
 394                         s32 rssi;
 395
 396                         trig = iwl_fw_dbg_get_trigger(mvm->fw,
 397                                                       FW_DBG_TRIGGER_RSSI);
 398                         rssi_trig = (void *)trig->data;
 399                         rssi = le32_to_cpu(rssi_trig->rssi);
 400
 401                         trig_check =
 402                                 iwl_fw_dbg_trigger_check_stop(&mvm->fwrt,
 403                                                               ieee80211_vif_to_wdev(mvmsta->vif),
 404                                                               trig);
 405                         if (trig_check && rx_status->signal < rssi)
 406                                 iwl_fw_dbg_collect_trig(&mvm->fwrt, trig,
 407                                                         NULL);
 408                 }
 409
 410                 if (ieee80211_is_data(hdr->frame_control))
 411                         iwl_mvm_rx_csum(sta, skb, rx_pkt_status);
 412         }
 413         rcu_read_unlock();
 414
 415         /* set the preamble flag if appropriate */
 416         if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_SHORT_PREAMBLE))
 417                 rx_status->enc_flags |= RX_ENC_FLAG_SHORTPRE;
 418
 419         if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
 420                 /*
 421                  * We know which subframes of an A-MPDU belong
 422                  * together since we get a single PHY response
 423                  * from the firmware for all of them
 424                  */
 425                 rx_status->flag |= RX_FLAG_AMPDU_DETAILS;
 426                 rx_status->ampdu_reference = mvm->ampdu_ref;
 427         }
 428
 429         /* Set up the HT phy flags */
 430         switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
 431         case RATE_MCS_CHAN_WIDTH_20:
 432                 break;
 433         case RATE_MCS_CHAN_WIDTH_40:
 434                 rx_status->bw = RATE_INFO_BW_40;
 435                 break;
 436         case RATE_MCS_CHAN_WIDTH_80:
 437                 rx_status->bw = RATE_INFO_BW_80;
 438                 break;
 439         case RATE_MCS_CHAN_WIDTH_160:
 440                 rx_status->bw = RATE_INFO_BW_160;
 441                 break;
 442         }
 443         if (!(rate_n_flags & RATE_MCS_CCK_MSK) &&
 444             rate_n_flags & RATE_MCS_SGI_MSK)
 445                 rx_status->enc_flags |= RX_ENC_FLAG_SHORT_GI;
 446         if (rate_n_flags & RATE_HT_MCS_GF_MSK)
 447                 rx_status->enc_flags |= RX_ENC_FLAG_HT_GF;
 448         if (rate_n_flags & RATE_MCS_LDPC_MSK)
 449                 rx_status->enc_flags |= RX_ENC_FLAG_LDPC;
 450         if (rate_n_flags & RATE_MCS_HT_MSK) {
 451                 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >>
 452                                 RATE_MCS_STBC_POS;
 453                 rx_status->encoding = RX_ENC_HT;
 454                 rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
 455                 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT;
 456         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 457                 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >>
 458                                 RATE_MCS_STBC_POS;
 459                 rx_status->nss =
 460                         ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
 461                                                 RATE_VHT_MCS_NSS_POS) + 1;
 462                 rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 463                 rx_status->encoding = RX_ENC_VHT;
 464                 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT;
 465                 if (rate_n_flags & RATE_MCS_BF_MSK)
 466                         rx_status->enc_flags |= RX_ENC_FLAG_BF;
 467         } else {
 468                 int rate = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
 469                                                                rx_status->band);
 470
 471                 if (WARN(rate < 0 || rate > 0xFF,
 472                          "Invalid rate flags 0x%x, band %d,\n",
 473                          rate_n_flags, rx_status->band)) {
 474                         kfree_skb(skb);
 475                         return;
 476                 }
 477                 rx_status->rate_idx = rate;
 478         }
 479
 480 #ifdef CONFIG_IWLWIFI_DEBUGFS
 481         iwl_mvm_update_frame_stats(mvm, rate_n_flags,
 482                                    rx_status->flag & RX_FLAG_AMPDU_DETAILS);
 483 #endif
 484
 485         if (unlikely((ieee80211_is_beacon(hdr->frame_control) ||
 486                       ieee80211_is_probe_resp(hdr->frame_control)) &&
 487                      mvm->sched_scan_pass_all == SCHED_SCAN_PASS_ALL_ENABLED))
 488                 mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_FOUND;
 489
 490         if (unlikely(ieee80211_is_beacon(hdr->frame_control) ||
 491                      ieee80211_is_probe_resp(hdr->frame_control)))
 492                 rx_status->boottime_ns = ktime_get_boot_ns();
 493
 494         /* Take a reference briefly to kick off a d0i3 entry delay so
 495          * we can handle bursts of RX packets without toggling the
 496          * state too often.  But don't do this for beacons if we are
 497          * going to idle because the beacon filtering changes we make
 498          * cause the firmware to send us collateral beacons. */
 499         take_ref = !(test_bit(STATUS_TRANS_GOING_IDLE, &mvm->trans->status) &&
 500                      ieee80211_is_beacon(hdr->frame_control));
 501
 502         if (take_ref)
 503                 iwl_mvm_ref(mvm, IWL_MVM_REF_RX);
 504
 505         iwl_mvm_pass_packet_to_mac80211(mvm, sta, napi, skb, hdr, len,
 506                                         crypt_len, rxb);
 507
 508         if (take_ref)
 509                 iwl_mvm_unref(mvm, IWL_MVM_REF_RX);
 510 }
 511
 512 struct iwl_mvm_stat_data {
 513         struct iwl_mvm *mvm;
 514         __le32 mac_id;
 515         u8 beacon_filter_average_energy;
 516         void *general;
 517 };
 518
 519 static void iwl_mvm_stat_iterator(void *_data, u8 *mac,
 520                                   struct ieee80211_vif *vif)
 521 {
 522         struct iwl_mvm_stat_data *data = _data;
 523         struct iwl_mvm *mvm = data->mvm;
 524         int sig = -data->beacon_filter_average_energy;
 525         int last_event;
 526         int thold = vif->bss_conf.cqm_rssi_thold;
 527         int hyst = vif->bss_conf.cqm_rssi_hyst;
 528         u16 id = le32_to_cpu(data->mac_id);
 529         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 530
 531         /* This doesn't need the MAC ID check since it's not taking the
 532          * data copied into the "data" struct, but rather the data from
 533          * the notification directly.
 534          */
 535         if (data->general) {
 536                 u16 vif_id = mvmvif->id;
 537
 538                 if (iwl_mvm_is_cdb_supported(mvm)) {
 539                         struct mvm_statistics_general_cdb *general =
 540                                 data->general;
 541
 542                         mvmvif->beacon_stats.num_beacons =
 543                                 le32_to_cpu(general->beacon_counter[vif_id]);
 544                         mvmvif->beacon_stats.avg_signal =
 545                                 -general->beacon_average_energy[vif_id];
 546                 } else {
 547                         struct mvm_statistics_general_v8 *general =
 548                                 data->general;
 549
 550                         mvmvif->beacon_stats.num_beacons =
 551                                 le32_to_cpu(general->beacon_counter[vif_id]);
 552                         mvmvif->beacon_stats.avg_signal =
 553                                 -general->beacon_average_energy[vif_id];
 554                 }
 555         }
 556
 557         if (mvmvif->id != id)
 558                 return;
 559
 560         if (vif->type != NL80211_IFTYPE_STATION)
 561                 return;
 562
 563         if (sig == 0) {
 564                 IWL_DEBUG_RX(mvm, "RSSI is 0 - skip signal based decision\n");
 565                 return;
 566         }
 567
 568         mvmvif->bf_data.ave_beacon_signal = sig;
 569
 570         /* BT Coex */
 571         if (mvmvif->bf_data.bt_coex_min_thold !=
 572             mvmvif->bf_data.bt_coex_max_thold) {
 573                 last_event = mvmvif->bf_data.last_bt_coex_event;
 574                 if (sig > mvmvif->bf_data.bt_coex_max_thold &&
 575                     (last_event <= mvmvif->bf_data.bt_coex_min_thold ||
 576                      last_event == 0)) {
 577                         mvmvif->bf_data.last_bt_coex_event = sig;
 578                         IWL_DEBUG_RX(mvm, "cqm_iterator bt coex high %d\n",
 579                                      sig);
 580                         iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_HIGH);
 581                 } else if (sig < mvmvif->bf_data.bt_coex_min_thold &&
 582                            (last_event >= mvmvif->bf_data.bt_coex_max_thold ||
 583                             last_event == 0)) {
 584                         mvmvif->bf_data.last_bt_coex_event = sig;
 585                         IWL_DEBUG_RX(mvm, "cqm_iterator bt coex low %d\n",
 586                                      sig);
 587                         iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_LOW);
 588                 }
 589         }
 590
 591         if (!(vif->driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI))
 592                 return;
 593
 594         /* CQM Notification */
 595         last_event = mvmvif->bf_data.last_cqm_event;
 596         if (thold && sig < thold && (last_event == 0 ||
 597                                      sig < last_event - hyst)) {
 598                 mvmvif->bf_data.last_cqm_event = sig;
 599                 IWL_DEBUG_RX(mvm, "cqm_iterator cqm low %d\n",
 600                              sig);
 601                 ieee80211_cqm_rssi_notify(
 602                         vif,
 603                         NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
 604                         sig,
 605                         GFP_KERNEL);
 606         } else if (sig > thold &&
 607                    (last_event == 0 || sig > last_event + hyst)) {
 608                 mvmvif->bf_data.last_cqm_event = sig;
 609                 IWL_DEBUG_RX(mvm, "cqm_iterator cqm high %d\n",
 610                              sig);
 611                 ieee80211_cqm_rssi_notify(
 612                         vif,
 613                         NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
 614                         sig,
 615                         GFP_KERNEL);
 616         }
 617 }
 618
 619 static inline void
 620 iwl_mvm_rx_stats_check_trigger(struct iwl_mvm *mvm, struct iwl_rx_packet *pkt)
 621 {
 622         struct iwl_fw_dbg_trigger_tlv *trig;
 623         struct iwl_fw_dbg_trigger_stats *trig_stats;
 624         u32 trig_offset, trig_thold;
 625
 626         if (!iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_STATS))
 627                 return;
 628
 629         trig = iwl_fw_dbg_get_trigger(mvm->fw, FW_DBG_TRIGGER_STATS);
 630         trig_stats = (void *)trig->data;
 631
 632         if (!iwl_fw_dbg_trigger_check_stop(&mvm->fwrt, NULL, trig))
 633                 return;
 634
 635         trig_offset = le32_to_cpu(trig_stats->stop_offset);
 636         trig_thold = le32_to_cpu(trig_stats->stop_threshold);
 637
 638         if (WARN_ON_ONCE(trig_offset >= iwl_rx_packet_payload_len(pkt)))
 639                 return;
 640
 641         if (le32_to_cpup((__le32 *) (pkt->data + trig_offset)) < trig_thold)
 642                 return;
 643
 644         iwl_fw_dbg_collect_trig(&mvm->fwrt, trig, NULL);
 645 }
 646
 647 void iwl_mvm_handle_rx_statistics(struct iwl_mvm *mvm,
 648                                   struct iwl_rx_packet *pkt)
 649 {
 650         struct iwl_mvm_stat_data data = {
 651                 .mvm = mvm,
 652         };
 653         int expected_size;
 654         int i;
 655         u8 *energy;
 656         __le32 *bytes, *air_time;
 657         __le32 flags;
 658
 659         if (!iwl_mvm_has_new_rx_stats_api(mvm)) {
 660                 if (iwl_mvm_has_new_rx_api(mvm))
 661                         expected_size = sizeof(struct iwl_notif_statistics_v11);
 662                 else
 663                         expected_size = sizeof(struct iwl_notif_statistics_v10);
 664         } else {
 665                 expected_size = sizeof(struct iwl_notif_statistics_cdb);
 666         }
 667
 668         if (iwl_rx_packet_payload_len(pkt) != expected_size) {
 669                 IWL_ERR(mvm, "received invalid statistics size (%d)!\n",
 670                         iwl_rx_packet_payload_len(pkt));
 671                 return;
 672         }
 673
 674         if (!iwl_mvm_has_new_rx_stats_api(mvm)) {
 675                 struct iwl_notif_statistics_v11 *stats = (void *)&pkt->data;
 676
 677                 data.mac_id = stats->rx.general.mac_id;
 678                 data.beacon_filter_average_energy =
 679                         stats->general.common.beacon_filter_average_energy;
 680
 681                 mvm->rx_stats_v3 = stats->rx;
 682
 683                 mvm->radio_stats.rx_time =
 684                         le64_to_cpu(stats->general.common.rx_time);
 685                 mvm->radio_stats.tx_time =
 686                         le64_to_cpu(stats->general.common.tx_time);
 687                 mvm->radio_stats.on_time_rf =
 688                         le64_to_cpu(stats->general.common.on_time_rf);
 689                 mvm->radio_stats.on_time_scan =
 690                         le64_to_cpu(stats->general.common.on_time_scan);
 691
 692                 data.general = &stats->general;
 693
 694                 flags = stats->flag;
 695         } else {
 696                 struct iwl_notif_statistics_cdb *stats = (void *)&pkt->data;
 697
 698                 data.mac_id = stats->rx.general.mac_id;
 699                 data.beacon_filter_average_energy =
 700                         stats->general.common.beacon_filter_average_energy;
 701
 702                 mvm->rx_stats = stats->rx;
 703
 704                 mvm->radio_stats.rx_time =
 705                         le64_to_cpu(stats->general.common.rx_time);
 706                 mvm->radio_stats.tx_time =
 707                         le64_to_cpu(stats->general.common.tx_time);
 708                 mvm->radio_stats.on_time_rf =
 709                         le64_to_cpu(stats->general.common.on_time_rf);
 710                 mvm->radio_stats.on_time_scan =
 711                         le64_to_cpu(stats->general.common.on_time_scan);
 712
 713                 data.general = &stats->general;
 714
 715                 flags = stats->flag;
 716         }
 717
 718         iwl_mvm_rx_stats_check_trigger(mvm, pkt);
 719
 720         ieee80211_iterate_active_interfaces(mvm->hw,
 721                                             IEEE80211_IFACE_ITER_NORMAL,
 722                                             iwl_mvm_stat_iterator,
 723                                             &data);
 724
 725         if (!iwl_mvm_has_new_rx_api(mvm))
 726                 return;
 727
 728         if (!iwl_mvm_has_new_rx_stats_api(mvm)) {
 729                 struct iwl_notif_statistics_v11 *v11 = (void *)&pkt->data;
 730
 731                 energy = (void *)&v11->load_stats.avg_energy;
 732                 bytes = (void *)&v11->load_stats.byte_count;
 733                 air_time = (void *)&v11->load_stats.air_time;
 734         } else {
 735                 struct iwl_notif_statistics_cdb *stats = (void *)&pkt->data;
 736
 737                 energy = (void *)&stats->load_stats.avg_energy;
 738                 bytes = (void *)&stats->load_stats.byte_count;
 739                 air_time = (void *)&stats->load_stats.air_time;
 740         }
 741
 742         rcu_read_lock();
 743         for (i = 0; i < ARRAY_SIZE(mvm->fw_id_to_mac_id); i++) {
 744                 struct iwl_mvm_sta *sta;
 745
 746                 if (!energy[i])
 747                         continue;
 748
 749                 sta = iwl_mvm_sta_from_staid_rcu(mvm, i);
 750                 if (!sta)
 751                         continue;
 752                 sta->avg_energy = energy[i];
 753         }
 754         rcu_read_unlock();
 755 }
 756
 757 void iwl_mvm_rx_statistics(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
 758 {
 759         iwl_mvm_handle_rx_statistics(mvm, rxb_addr(rxb));
 760 }
 761
 762 void iwl_mvm_window_status_notif(struct iwl_mvm *mvm,
 763                                  struct iwl_rx_cmd_buffer *rxb)
 764 {
 765         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 766         struct iwl_ba_window_status_notif *notif = (void *)pkt->data;
 767         int i;
 768         u32 pkt_len = iwl_rx_packet_payload_len(pkt);
 769
 770         if (WARN_ONCE(pkt_len != sizeof(*notif),
 771                       "Received window status notification of wrong size (%u)\n",
 772                       pkt_len))
 773                 return;
 774
 775         rcu_read_lock();
 776         for (i = 0; i < BA_WINDOW_STREAMS_MAX; i++) {
 777                 struct ieee80211_sta *sta;
 778                 u8 sta_id, tid;
 779                 u64 bitmap;
 780                 u32 ssn;
 781                 u16 ratid;
 782                 u16 received_mpdu;
 783
 784                 ratid = le16_to_cpu(notif->ra_tid[i]);
 785                 /* check that this TID is valid */
 786                 if (!(ratid & BA_WINDOW_STATUS_VALID_MSK))
 787                         continue;
 788
 789                 received_mpdu = le16_to_cpu(notif->mpdu_rx_count[i]);
 790                 if (received_mpdu == 0)
 791                         continue;
 792
 793                 tid = ratid & BA_WINDOW_STATUS_TID_MSK;
 794                 /* get the station */
 795                 sta_id = (ratid & BA_WINDOW_STATUS_STA_ID_MSK)
 796                          >> BA_WINDOW_STATUS_STA_ID_POS;
 797                 sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
 798                 if (IS_ERR_OR_NULL(sta))
 799                         continue;
 800                 bitmap = le64_to_cpu(notif->bitmap[i]);
 801                 ssn = le32_to_cpu(notif->start_seq_num[i]);
 802
 803                 /* update mac80211 with the bitmap for the reordering buffer */
 804                 ieee80211_mark_rx_ba_filtered_frames(sta, tid, ssn, bitmap,
 805                                                      received_mpdu);
 806         }
 807         rcu_read_unlock();
 808 }