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  *
  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
  71 /*
  72  * iwl_mvm_rx_rx_phy_cmd - REPLY_RX_PHY_CMD handler
  73  *
  74  * Copies the phy information in mvm->last_phy_info, it will be used when the
  75  * actual data will come from the fw in the next packet.
  76  */
  77 void iwl_mvm_rx_rx_phy_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
  78 {
  79         struct iwl_rx_packet *pkt = rxb_addr(rxb);
  80
  81         memcpy(&mvm->last_phy_info, pkt->data, sizeof(mvm->last_phy_info));
  82         mvm->ampdu_ref++;
  83
  84 #ifdef CONFIG_IWLWIFI_DEBUGFS
  85         if (mvm->last_phy_info.phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
  86                 spin_lock(&mvm->drv_stats_lock);
  87                 mvm->drv_rx_stats.ampdu_count++;
  88                 spin_unlock(&mvm->drv_stats_lock);
  89         }
  90 #endif
  91 }
  92
  93 /*
  94  * iwl_mvm_pass_packet_to_mac80211 - builds the packet for mac80211
  95  *
  96  * Adds the rxb to a new skb and give it to mac80211
  97  */
  98 static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm,
  99                                             struct ieee80211_sta *sta,
 100                                             struct napi_struct *napi,
 101                                             struct sk_buff *skb,
 102                                             struct ieee80211_hdr *hdr, u16 len,
 103                                             u8 crypt_len,
 104                                             struct iwl_rx_cmd_buffer *rxb)
 105 {
 106         unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
 107         unsigned int fraglen;
 108
 109         /*
 110          * The 'hdrlen' (plus the 8 bytes for the SNAP and the crypt_len,
 111          * but those are all multiples of 4 long) all goes away, but we
 112          * want the *end* of it, which is going to be the start of the IP
 113          * header, to be aligned when it gets pulled in.
 114          * The beginning of the skb->data is aligned on at least a 4-byte
 115          * boundary after allocation. Everything here is aligned at least
 116          * on a 2-byte boundary so we can just take hdrlen & 3 and pad by
 117          * the result.
 118          */
 119         skb_reserve(skb, hdrlen & 3);
 120
 121         /* If frame is small enough to fit in skb->head, pull it completely.
 122          * If not, only pull ieee80211_hdr (including crypto if present, and
 123          * an additional 8 bytes for SNAP/ethertype, see below) so that
 124          * splice() or TCP coalesce are more efficient.
 125          *
 126          * Since, in addition, ieee80211_data_to_8023() always pull in at
 127          * least 8 bytes (possibly more for mesh) we can do the same here
 128          * to save the cost of doing it later. That still doesn't pull in
 129          * the actual IP header since the typical case has a SNAP header.
 130          * If the latter changes (there are efforts in the standards group
 131          * to do so) we should revisit this and ieee80211_data_to_8023().
 132          */
 133         hdrlen = (len <= skb_tailroom(skb)) ? len : hdrlen + crypt_len + 8;
 134
 135         skb_put_data(skb, hdr, hdrlen);
 136         fraglen = len - hdrlen;
 137
 138         if (fraglen) {
 139                 int offset = (void *)hdr + hdrlen -
 140                              rxb_addr(rxb) + rxb_offset(rxb);
 141
 142                 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
 143                                 fraglen, rxb->truesize);
 144         }
 145
 146         ieee80211_rx_napi(mvm->hw, sta, skb, napi);
 147 }
 148
 149 /*
 150  * iwl_mvm_get_signal_strength - use new rx PHY INFO API
 151  * values are reported by the fw as positive values - need to negate
 152  * to obtain their dBM.  Account for missing antennas by replacing 0
 153  * values by -256dBm: practically 0 power and a non-feasible 8 bit value.
 154  */
 155 static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm,
 156                                         struct iwl_rx_phy_info *phy_info,
 157                                         struct ieee80211_rx_status *rx_status)
 158 {
 159         int energy_a, energy_b, energy_c, max_energy;
 160         u32 val;
 161
 162         val =
 163             le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_ENERGY_ANT_ABC_IDX]);
 164         energy_a = (val & IWL_RX_INFO_ENERGY_ANT_A_MSK) >>
 165                                                 IWL_RX_INFO_ENERGY_ANT_A_POS;
 166         energy_a = energy_a ? -energy_a : S8_MIN;
 167         energy_b = (val & IWL_RX_INFO_ENERGY_ANT_B_MSK) >>
 168                                                 IWL_RX_INFO_ENERGY_ANT_B_POS;
 169         energy_b = energy_b ? -energy_b : S8_MIN;
 170         energy_c = (val & IWL_RX_INFO_ENERGY_ANT_C_MSK) >>
 171                                                 IWL_RX_INFO_ENERGY_ANT_C_POS;
 172         energy_c = energy_c ? -energy_c : S8_MIN;
 173         max_energy = max(energy_a, energy_b);
 174         max_energy = max(max_energy, energy_c);
 175
 176         IWL_DEBUG_STATS(mvm, "energy In A %d B %d C %d , and max %d\n",
 177                         energy_a, energy_b, energy_c, max_energy);
 178
 179         rx_status->signal = max_energy;
 180         rx_status->chains = (le16_to_cpu(phy_info->phy_flags) &
 181                                 RX_RES_PHY_FLAGS_ANTENNA)
 182                                         >> RX_RES_PHY_FLAGS_ANTENNA_POS;
 183         rx_status->chain_signal[0] = energy_a;
 184         rx_status->chain_signal[1] = energy_b;
 185         rx_status->chain_signal[2] = energy_c;
 186 }
 187
 188 /*
 189  * iwl_mvm_set_mac80211_rx_flag - translate fw status to mac80211 format
 190  * @mvm: the mvm object
 191  * @hdr: 80211 header
 192  * @stats: status in mac80211's format
 193  * @rx_pkt_status: status coming from fw
 194  *
 195  * returns non 0 value if the packet should be dropped
 196  */
 197 static u32 iwl_mvm_set_mac80211_rx_flag(struct iwl_mvm *mvm,
 198                                         struct ieee80211_hdr *hdr,
 199                                         struct ieee80211_rx_status *stats,
 200                                         u32 rx_pkt_status,
 201                                         u8 *crypt_len)
 202 {
 203         if (!ieee80211_has_protected(hdr->frame_control) ||
 204             (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 205                              RX_MPDU_RES_STATUS_SEC_NO_ENC)
 206                 return 0;
 207
 208         /* packet was encrypted with unknown alg */
 209         if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 210                                         RX_MPDU_RES_STATUS_SEC_ENC_ERR)
 211                 return 0;
 212
 213         switch (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) {
 214         case RX_MPDU_RES_STATUS_SEC_CCM_ENC:
 215                 /* alg is CCM: check MIC only */
 216                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
 217                         return -1;
 218
 219                 stats->flag |= RX_FLAG_DECRYPTED;
 220                 *crypt_len = IEEE80211_CCMP_HDR_LEN;
 221                 return 0;
 222
 223         case RX_MPDU_RES_STATUS_SEC_TKIP_ENC:
 224                 /* Don't drop the frame and decrypt it in SW */
 225                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_TTAK_OK))
 226                         return 0;
 227                 *crypt_len = IEEE80211_TKIP_IV_LEN;
 228                 /* fall through if TTAK OK */
 229
 230         case RX_MPDU_RES_STATUS_SEC_WEP_ENC:
 231                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_ICV_OK))
 232                         return -1;
 233
 234                 stats->flag |= RX_FLAG_DECRYPTED;
 235                 if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 236                                 RX_MPDU_RES_STATUS_SEC_WEP_ENC)
 237                         *crypt_len = IEEE80211_WEP_IV_LEN;
 238                 return 0;
 239
 240         case RX_MPDU_RES_STATUS_SEC_EXT_ENC:
 241                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
 242                         return -1;
 243                 stats->flag |= RX_FLAG_DECRYPTED;
 244                 return 0;
 245
 246         default:
 247                 /* Expected in monitor (not having the keys) */
 248                 if (!mvm->monitor_on)
 249                         IWL_ERR(mvm, "Unhandled alg: 0x%x\n", rx_pkt_status);
 250         }
 251
 252         return 0;
 253 }
 254
 255 static void iwl_mvm_rx_csum(struct ieee80211_sta *sta,
 256                             struct sk_buff *skb,
 257                             u32 status)
 258 {
 259         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 260         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
 261
 262         if (mvmvif->features & NETIF_F_RXCSUM &&
 263             status & RX_MPDU_RES_STATUS_CSUM_DONE &&
 264             status & RX_MPDU_RES_STATUS_CSUM_OK)
 265                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 266 }
 267
 268 /*
 269  * iwl_mvm_rx_rx_mpdu - REPLY_RX_MPDU_CMD handler
 270  *
 271  * Handles the actual data of the Rx packet from the fw
 272  */
 273 void iwl_mvm_rx_rx_mpdu(struct iwl_mvm *mvm, struct napi_struct *napi,
 274                         struct iwl_rx_cmd_buffer *rxb)
 275 {
 276         struct ieee80211_hdr *hdr;
 277         struct ieee80211_rx_status *rx_status;
 278         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 279         struct iwl_rx_phy_info *phy_info;
 280         struct iwl_rx_mpdu_res_start *rx_res;
 281         struct ieee80211_sta *sta = NULL;
 282         struct sk_buff *skb;
 283         u32 len;
 284         u32 rate_n_flags;
 285         u32 rx_pkt_status;
 286         u8 crypt_len = 0;
 287         bool take_ref;
 288
 289         phy_info = &mvm->last_phy_info;
 290         rx_res = (struct iwl_rx_mpdu_res_start *)pkt->data;
 291         hdr = (struct ieee80211_hdr *)(pkt->data + sizeof(*rx_res));
 292         len = le16_to_cpu(rx_res->byte_count);
 293         rx_pkt_status = le32_to_cpup((__le32 *)
 294                 (pkt->data + sizeof(*rx_res) + len));
 295
 296         /* Dont use dev_alloc_skb(), we'll have enough headroom once
 297          * ieee80211_hdr pulled.
 298          */
 299         skb = alloc_skb(128, GFP_ATOMIC);
 300         if (!skb) {
 301                 IWL_ERR(mvm, "alloc_skb failed\n");
 302                 return;
 303         }
 304
 305         rx_status = IEEE80211_SKB_RXCB(skb);
 306
 307         /*
 308          * drop the packet if it has failed being decrypted by HW
 309          */
 310         if (iwl_mvm_set_mac80211_rx_flag(mvm, hdr, rx_status, rx_pkt_status,
 311                                          &crypt_len)) {
 312                 IWL_DEBUG_DROP(mvm, "Bad decryption results 0x%08x\n",
 313                                rx_pkt_status);
 314                 kfree_skb(skb);
 315                 return;
 316         }
 317
 318         /*
 319          * Keep packets with CRC errors (and with overrun) for monitor mode
 320          * (otherwise the firmware discards them) but mark them as bad.
 321          */
 322         if (!(rx_pkt_status & RX_MPDU_RES_STATUS_CRC_OK) ||
 323             !(rx_pkt_status & RX_MPDU_RES_STATUS_OVERRUN_OK)) {
 324                 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n", rx_pkt_status);
 325                 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
 326         }
 327
 328         /* This will be used in several places later */
 329         rate_n_flags = le32_to_cpu(phy_info->rate_n_flags);
 330
 331         /* rx_status carries information about the packet to mac80211 */
 332         rx_status->mactime = le64_to_cpu(phy_info->timestamp);
 333         rx_status->device_timestamp = le32_to_cpu(phy_info->system_timestamp);
 334         rx_status->band =
 335                 (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_BAND_24)) ?
 336                                 NL80211_BAND_2GHZ : NL80211_BAND_5GHZ;
 337         rx_status->freq =
 338                 ieee80211_channel_to_frequency(le16_to_cpu(phy_info->channel),
 339                                                rx_status->band);
 340
 341         /* TSF as indicated by the firmware  is at INA time */
 342         rx_status->flag |= RX_FLAG_MACTIME_PLCP_START;
 343
 344         iwl_mvm_get_signal_strength(mvm, phy_info, rx_status);
 345
 346         IWL_DEBUG_STATS_LIMIT(mvm, "Rssi %d, TSF %llu\n", rx_status->signal,
 347                               (unsigned long long)rx_status->mactime);
 348
 349         rcu_read_lock();
 350         if (rx_pkt_status & RX_MPDU_RES_STATUS_SRC_STA_FOUND) {
 351                 u32 id = rx_pkt_status & RX_MPDU_RES_STATUS_STA_ID_MSK;
 352
 353                 id >>= RX_MDPU_RES_STATUS_STA_ID_SHIFT;
 354
 355                 if (!WARN_ON_ONCE(id >= ARRAY_SIZE(mvm->fw_id_to_mac_id))) {
 356                         sta = rcu_dereference(mvm->fw_id_to_mac_id[id]);
 357                         if (IS_ERR(sta))
 358                                 sta = NULL;
 359                 }
 360         } else if (!is_multicast_ether_addr(hdr->addr2)) {
 361                 /* This is fine since we prevent two stations with the same
 362                  * address from being added.
 363                  */
 364                 sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL);
 365         }
 366
 367         if (sta) {
 368                 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 369                 struct ieee80211_vif *tx_blocked_vif =
 370                         rcu_dereference(mvm->csa_tx_blocked_vif);
 371
 372                 /* We have tx blocked stations (with CS bit). If we heard
 373                  * frames from a blocked station on a new channel we can
 374                  * TX to it again.
 375                  */
 376                 if (unlikely(tx_blocked_vif) &&
 377                     mvmsta->vif == tx_blocked_vif) {
 378                         struct iwl_mvm_vif *mvmvif =
 379                                 iwl_mvm_vif_from_mac80211(tx_blocked_vif);
 380
 381                         if (mvmvif->csa_target_freq == rx_status->freq)
 382                                 iwl_mvm_sta_modify_disable_tx_ap(mvm, sta,
 383                                                                  false);
 384                 }
 385
 386                 rs_update_last_rssi(mvm, &mvmsta->lq_sta, rx_status);
 387
 388                 if (iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_RSSI) &&
 389                     ieee80211_is_beacon(hdr->frame_control)) {
 390                         struct iwl_fw_dbg_trigger_tlv *trig;
 391                         struct iwl_fw_dbg_trigger_low_rssi *rssi_trig;
 392                         bool trig_check;
 393                         s32 rssi;
 394
 395                         trig = iwl_fw_dbg_get_trigger(mvm->fw,
 396                                                       FW_DBG_TRIGGER_RSSI);
 397                         rssi_trig = (void *)trig->data;
 398                         rssi = le32_to_cpu(rssi_trig->rssi);
 399
 400                         trig_check =
 401                                 iwl_fw_dbg_trigger_check_stop(&mvm->fwrt,
 402                                                               ieee80211_vif_to_wdev(mvmsta->vif),
 403                                                               trig);
 404                         if (trig_check && rx_status->signal < rssi)
 405                                 iwl_fw_dbg_collect_trig(&mvm->fwrt, trig,
 406                                                         NULL);
 407                 }
 408
 409                 if (ieee80211_is_data(hdr->frame_control))
 410                         iwl_mvm_rx_csum(sta, skb, rx_pkt_status);
 411         }
 412         rcu_read_unlock();
 413
 414         /* set the preamble flag if appropriate */
 415         if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_SHORT_PREAMBLE))
 416                 rx_status->enc_flags |= RX_ENC_FLAG_SHORTPRE;
 417
 418         if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
 419                 /*
 420                  * We know which subframes of an A-MPDU belong
 421                  * together since we get a single PHY response
 422                  * from the firmware for all of them
 423                  */
 424                 rx_status->flag |= RX_FLAG_AMPDU_DETAILS;
 425                 rx_status->ampdu_reference = mvm->ampdu_ref;
 426         }
 427
 428         /* Set up the HT phy flags */
 429         switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
 430         case RATE_MCS_CHAN_WIDTH_20:
 431                 break;
 432         case RATE_MCS_CHAN_WIDTH_40:
 433                 rx_status->bw = RATE_INFO_BW_40;
 434                 break;
 435         case RATE_MCS_CHAN_WIDTH_80:
 436                 rx_status->bw = RATE_INFO_BW_80;
 437                 break;
 438         case RATE_MCS_CHAN_WIDTH_160:
 439                 rx_status->bw = RATE_INFO_BW_160;
 440                 break;
 441         }
 442         if (rate_n_flags & RATE_MCS_SGI_MSK)
 443                 rx_status->enc_flags |= RX_ENC_FLAG_SHORT_GI;
 444         if (rate_n_flags & RATE_HT_MCS_GF_MSK)
 445                 rx_status->enc_flags |= RX_ENC_FLAG_HT_GF;
 446         if (rate_n_flags & RATE_MCS_LDPC_MSK)
 447                 rx_status->enc_flags |= RX_ENC_FLAG_LDPC;
 448         if (rate_n_flags & RATE_MCS_HT_MSK) {
 449                 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >>
 450                                 RATE_MCS_STBC_POS;
 451                 rx_status->encoding = RX_ENC_HT;
 452                 rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
 453                 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT;
 454         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 455                 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >>
 456                                 RATE_MCS_STBC_POS;
 457                 rx_status->nss =
 458                         ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
 459                                                 RATE_VHT_MCS_NSS_POS) + 1;
 460                 rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 461                 rx_status->encoding = RX_ENC_VHT;
 462                 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT;
 463                 if (rate_n_flags & RATE_MCS_BF_MSK)
 464                         rx_status->enc_flags |= RX_ENC_FLAG_BF;
 465         } else {
 466                 int rate = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
 467                                                                rx_status->band);
 468
 469                 if (WARN(rate < 0 || rate > 0xFF,
 470                          "Invalid rate flags 0x%x, band %d,\n",
 471                          rate_n_flags, rx_status->band)) {
 472                         kfree_skb(skb);
 473                         return;
 474                 }
 475                 rx_status->rate_idx = rate;
 476         }
 477
 478 #ifdef CONFIG_IWLWIFI_DEBUGFS
 479         iwl_mvm_update_frame_stats(mvm, rate_n_flags,
 480                                    rx_status->flag & RX_FLAG_AMPDU_DETAILS);
 481 #endif
 482
 483         if (unlikely((ieee80211_is_beacon(hdr->frame_control) ||
 484                       ieee80211_is_probe_resp(hdr->frame_control)) &&
 485                      mvm->sched_scan_pass_all == SCHED_SCAN_PASS_ALL_ENABLED))
 486                 mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_FOUND;
 487
 488         if (unlikely(ieee80211_is_beacon(hdr->frame_control) ||
 489                      ieee80211_is_probe_resp(hdr->frame_control)))
 490                 rx_status->boottime_ns = ktime_get_boot_ns();
 491
 492         /* Take a reference briefly to kick off a d0i3 entry delay so
 493          * we can handle bursts of RX packets without toggling the
 494          * state too often.  But don't do this for beacons if we are
 495          * going to idle because the beacon filtering changes we make
 496          * cause the firmware to send us collateral beacons. */
 497         take_ref = !(test_bit(STATUS_TRANS_GOING_IDLE, &mvm->trans->status) &&
 498                      ieee80211_is_beacon(hdr->frame_control));
 499
 500         if (take_ref)
 501                 iwl_mvm_ref(mvm, IWL_MVM_REF_RX);
 502
 503         iwl_mvm_pass_packet_to_mac80211(mvm, sta, napi, skb, hdr, len,
 504                                         crypt_len, rxb);
 505
 506         if (take_ref)
 507                 iwl_mvm_unref(mvm, IWL_MVM_REF_RX);
 508 }
 509
 510 struct iwl_mvm_stat_data {
 511         struct iwl_mvm *mvm;
 512         __le32 mac_id;
 513         u8 beacon_filter_average_energy;
 514         void *general;
 515 };
 516
 517 static void iwl_mvm_stat_iterator(void *_data, u8 *mac,
 518                                   struct ieee80211_vif *vif)
 519 {
 520         struct iwl_mvm_stat_data *data = _data;
 521         struct iwl_mvm *mvm = data->mvm;
 522         int sig = -data->beacon_filter_average_energy;
 523         int last_event;
 524         int thold = vif->bss_conf.cqm_rssi_thold;
 525         int hyst = vif->bss_conf.cqm_rssi_hyst;
 526         u16 id = le32_to_cpu(data->mac_id);
 527         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 528
 529         /* This doesn't need the MAC ID check since it's not taking the
 530          * data copied into the "data" struct, but rather the data from
 531          * the notification directly.
 532          */
 533         if (data->general) {
 534                 u16 vif_id = mvmvif->id;
 535
 536                 if (iwl_mvm_is_cdb_supported(mvm)) {
 537                         struct mvm_statistics_general_cdb *general =
 538                                 data->general;
 539
 540                         mvmvif->beacon_stats.num_beacons =
 541                                 le32_to_cpu(general->beacon_counter[vif_id]);
 542                         mvmvif->beacon_stats.avg_signal =
 543                                 -general->beacon_average_energy[vif_id];
 544                 } else {
 545                         struct mvm_statistics_general_v8 *general =
 546                                 data->general;
 547
 548                         mvmvif->beacon_stats.num_beacons =
 549                                 le32_to_cpu(general->beacon_counter[vif_id]);
 550                         mvmvif->beacon_stats.avg_signal =
 551                                 -general->beacon_average_energy[vif_id];
 552                 }
 553         }
 554
 555         if (mvmvif->id != id)
 556                 return;
 557
 558         if (vif->type != NL80211_IFTYPE_STATION)
 559                 return;
 560
 561         if (sig == 0) {
 562                 IWL_DEBUG_RX(mvm, "RSSI is 0 - skip signal based decision\n");
 563                 return;
 564         }
 565
 566         mvmvif->bf_data.ave_beacon_signal = sig;
 567
 568         /* BT Coex */
 569         if (mvmvif->bf_data.bt_coex_min_thold !=
 570             mvmvif->bf_data.bt_coex_max_thold) {
 571                 last_event = mvmvif->bf_data.last_bt_coex_event;
 572                 if (sig > mvmvif->bf_data.bt_coex_max_thold &&
 573                     (last_event <= mvmvif->bf_data.bt_coex_min_thold ||
 574                      last_event == 0)) {
 575                         mvmvif->bf_data.last_bt_coex_event = sig;
 576                         IWL_DEBUG_RX(mvm, "cqm_iterator bt coex high %d\n",
 577                                      sig);
 578                         iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_HIGH);
 579                 } else if (sig < mvmvif->bf_data.bt_coex_min_thold &&
 580                            (last_event >= mvmvif->bf_data.bt_coex_max_thold ||
 581                             last_event == 0)) {
 582                         mvmvif->bf_data.last_bt_coex_event = sig;
 583                         IWL_DEBUG_RX(mvm, "cqm_iterator bt coex low %d\n",
 584                                      sig);
 585                         iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_LOW);
 586                 }
 587         }
 588
 589         if (!(vif->driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI))
 590                 return;
 591
 592         /* CQM Notification */
 593         last_event = mvmvif->bf_data.last_cqm_event;
 594         if (thold && sig < thold && (last_event == 0 ||
 595                                      sig < last_event - hyst)) {
 596                 mvmvif->bf_data.last_cqm_event = sig;
 597                 IWL_DEBUG_RX(mvm, "cqm_iterator cqm low %d\n",
 598                              sig);
 599                 ieee80211_cqm_rssi_notify(
 600                         vif,
 601                         NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
 602                         sig,
 603                         GFP_KERNEL);
 604         } else if (sig > thold &&
 605                    (last_event == 0 || sig > last_event + hyst)) {
 606                 mvmvif->bf_data.last_cqm_event = sig;
 607                 IWL_DEBUG_RX(mvm, "cqm_iterator cqm high %d\n",
 608                              sig);
 609                 ieee80211_cqm_rssi_notify(
 610                         vif,
 611                         NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
 612                         sig,
 613                         GFP_KERNEL);
 614         }
 615 }
 616
 617 static inline void
 618 iwl_mvm_rx_stats_check_trigger(struct iwl_mvm *mvm, struct iwl_rx_packet *pkt)
 619 {
 620         struct iwl_fw_dbg_trigger_tlv *trig;
 621         struct iwl_fw_dbg_trigger_stats *trig_stats;
 622         u32 trig_offset, trig_thold;
 623
 624         if (!iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_STATS))
 625                 return;
 626
 627         trig = iwl_fw_dbg_get_trigger(mvm->fw, FW_DBG_TRIGGER_STATS);
 628         trig_stats = (void *)trig->data;
 629
 630         if (!iwl_fw_dbg_trigger_check_stop(&mvm->fwrt, NULL, trig))
 631                 return;
 632
 633         trig_offset = le32_to_cpu(trig_stats->stop_offset);
 634         trig_thold = le32_to_cpu(trig_stats->stop_threshold);
 635
 636         if (WARN_ON_ONCE(trig_offset >= iwl_rx_packet_payload_len(pkt)))
 637                 return;
 638
 639         if (le32_to_cpup((__le32 *) (pkt->data + trig_offset)) < trig_thold)
 640                 return;
 641
 642         iwl_fw_dbg_collect_trig(&mvm->fwrt, trig, NULL);
 643 }
 644
 645 void iwl_mvm_handle_rx_statistics(struct iwl_mvm *mvm,
 646                                   struct iwl_rx_packet *pkt)
 647 {
 648         struct iwl_mvm_stat_data data = {
 649                 .mvm = mvm,
 650         };
 651         int expected_size;
 652         int i;
 653         u8 *energy;
 654         __le32 *bytes, *air_time;
 655         __le32 flags;
 656
 657         if (!iwl_mvm_has_new_rx_stats_api(mvm)) {
 658                 if (iwl_mvm_has_new_rx_api(mvm))
 659                         expected_size = sizeof(struct iwl_notif_statistics_v11);
 660                 else
 661                         expected_size = sizeof(struct iwl_notif_statistics_v10);
 662         } else {
 663                 expected_size = sizeof(struct iwl_notif_statistics_cdb);
 664         }
 665
 666         if (WARN_ONCE(iwl_rx_packet_payload_len(pkt) != expected_size,
 667                       "received invalid statistics size (%d)!\n",
 668                       iwl_rx_packet_payload_len(pkt)))
 669                 return;
 670
 671         if (!iwl_mvm_has_new_rx_stats_api(mvm)) {
 672                 struct iwl_notif_statistics_v11 *stats = (void *)&pkt->data;
 673
 674                 data.mac_id = stats->rx.general.mac_id;
 675                 data.beacon_filter_average_energy =
 676                         stats->general.common.beacon_filter_average_energy;
 677
 678                 mvm->rx_stats_v3 = stats->rx;
 679
 680                 mvm->radio_stats.rx_time =
 681                         le64_to_cpu(stats->general.common.rx_time);
 682                 mvm->radio_stats.tx_time =
 683                         le64_to_cpu(stats->general.common.tx_time);
 684                 mvm->radio_stats.on_time_rf =
 685                         le64_to_cpu(stats->general.common.on_time_rf);
 686                 mvm->radio_stats.on_time_scan =
 687                         le64_to_cpu(stats->general.common.on_time_scan);
 688
 689                 data.general = &stats->general;
 690
 691                 flags = stats->flag;
 692         } else {
 693                 struct iwl_notif_statistics_cdb *stats = (void *)&pkt->data;
 694
 695                 data.mac_id = stats->rx.general.mac_id;
 696                 data.beacon_filter_average_energy =
 697                         stats->general.common.beacon_filter_average_energy;
 698
 699                 mvm->rx_stats = stats->rx;
 700
 701                 mvm->radio_stats.rx_time =
 702                         le64_to_cpu(stats->general.common.rx_time);
 703                 mvm->radio_stats.tx_time =
 704                         le64_to_cpu(stats->general.common.tx_time);
 705                 mvm->radio_stats.on_time_rf =
 706                         le64_to_cpu(stats->general.common.on_time_rf);
 707                 mvm->radio_stats.on_time_scan =
 708                         le64_to_cpu(stats->general.common.on_time_scan);
 709
 710                 data.general = &stats->general;
 711
 712                 flags = stats->flag;
 713         }
 714
 715         iwl_mvm_rx_stats_check_trigger(mvm, pkt);
 716
 717         ieee80211_iterate_active_interfaces(mvm->hw,
 718                                             IEEE80211_IFACE_ITER_NORMAL,
 719                                             iwl_mvm_stat_iterator,
 720                                             &data);
 721
 722         if (!iwl_mvm_has_new_rx_api(mvm))
 723                 return;
 724
 725         if (!iwl_mvm_has_new_rx_stats_api(mvm)) {
 726                 struct iwl_notif_statistics_v11 *v11 = (void *)&pkt->data;
 727
 728                 energy = (void *)&v11->load_stats.avg_energy;
 729                 bytes = (void *)&v11->load_stats.byte_count;
 730                 air_time = (void *)&v11->load_stats.air_time;
 731         } else {
 732                 struct iwl_notif_statistics_cdb *stats = (void *)&pkt->data;
 733
 734                 energy = (void *)&stats->load_stats.avg_energy;
 735                 bytes = (void *)&stats->load_stats.byte_count;
 736                 air_time = (void *)&stats->load_stats.air_time;
 737         }
 738
 739         rcu_read_lock();
 740         for (i = 0; i < ARRAY_SIZE(mvm->fw_id_to_mac_id); i++) {
 741                 struct iwl_mvm_sta *sta;
 742
 743                 if (!energy[i])
 744                         continue;
 745
 746                 sta = iwl_mvm_sta_from_staid_rcu(mvm, i);
 747                 if (!sta)
 748                         continue;
 749                 sta->avg_energy = energy[i];
 750         }
 751         rcu_read_unlock();
 752 }
 753
 754 void iwl_mvm_rx_statistics(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
 755 {
 756         iwl_mvm_handle_rx_statistics(mvm, rxb_addr(rxb));
 757 }
 758
 759 void iwl_mvm_window_status_notif(struct iwl_mvm *mvm,
 760                                  struct iwl_rx_cmd_buffer *rxb)
 761 {
 762         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 763         struct iwl_ba_window_status_notif *notif = (void *)pkt->data;
 764         int i;
 765         u32 pkt_len = iwl_rx_packet_payload_len(pkt);
 766
 767         if (WARN_ONCE(pkt_len != sizeof(*notif),
 768                       "Received window status notification of wrong size (%u)\n",
 769                       pkt_len))
 770                 return;
 771
 772         rcu_read_lock();
 773         for (i = 0; i < BA_WINDOW_STREAMS_MAX; i++) {
 774                 struct ieee80211_sta *sta;
 775                 u8 sta_id, tid;
 776                 u64 bitmap;
 777                 u32 ssn;
 778                 u16 ratid;
 779                 u16 received_mpdu;
 780
 781                 ratid = le16_to_cpu(notif->ra_tid[i]);
 782                 /* check that this TID is valid */
 783                 if (!(ratid & BA_WINDOW_STATUS_VALID_MSK))
 784                         continue;
 785
 786                 received_mpdu = le16_to_cpu(notif->mpdu_rx_count[i]);
 787                 if (received_mpdu == 0)
 788                         continue;
 789
 790                 tid = ratid & BA_WINDOW_STATUS_TID_MSK;
 791                 /* get the station */
 792                 sta_id = (ratid & BA_WINDOW_STATUS_STA_ID_MSK)
 793                          >> BA_WINDOW_STATUS_STA_ID_POS;
 794                 sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
 795                 if (IS_ERR_OR_NULL(sta))
 796                         continue;
 797                 bitmap = le64_to_cpu(notif->bitmap[i]);
 798                 ssn = le32_to_cpu(notif->start_seq_num[i]);
 799
 800                 /* update mac80211 with the bitmap for the reordering buffer */
 801                 ieee80211_mark_rx_ba_filtered_frames(sta, tid, ssn, bitmap,
 802                                                      received_mpdu);
 803         }
 804         rcu_read_unlock();
 805 }