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 <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 #include "fw-dbg.h"
  72
  73 /*
  74  * iwl_mvm_rx_rx_phy_cmd - REPLY_RX_PHY_CMD handler
  75  *
  76  * Copies the phy information in mvm->last_phy_info, it will be used when the
  77  * actual data will come from the fw in the next packet.
  78  */
  79 void iwl_mvm_rx_rx_phy_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
  80 {
  81         struct iwl_rx_packet *pkt = rxb_addr(rxb);
  82
  83         memcpy(&mvm->last_phy_info, pkt->data, sizeof(mvm->last_phy_info));
  84         mvm->ampdu_ref++;
  85
  86 #ifdef CONFIG_IWLWIFI_DEBUGFS
  87         if (mvm->last_phy_info.phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
  88                 spin_lock(&mvm->drv_stats_lock);
  89                 mvm->drv_rx_stats.ampdu_count++;
  90                 spin_unlock(&mvm->drv_stats_lock);
  91         }
  92 #endif
  93 }
  94
  95 /*
  96  * iwl_mvm_pass_packet_to_mac80211 - builds the packet for mac80211
  97  *
  98  * Adds the rxb to a new skb and give it to mac80211
  99  */
 100 static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm,
 101                                             struct ieee80211_sta *sta,
 102                                             struct napi_struct *napi,
 103                                             struct sk_buff *skb,
 104                                             struct ieee80211_hdr *hdr, u16 len,
 105                                             u8 crypt_len,
 106                                             struct iwl_rx_cmd_buffer *rxb)
 107 {
 108         unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
 109         unsigned int fraglen;
 110
 111         /*
 112          * The 'hdrlen' (plus the 8 bytes for the SNAP and the crypt_len,
 113          * but those are all multiples of 4 long) all goes away, but we
 114          * want the *end* of it, which is going to be the start of the IP
 115          * header, to be aligned when it gets pulled in.
 116          * The beginning of the skb->data is aligned on at least a 4-byte
 117          * boundary after allocation. Everything here is aligned at least
 118          * on a 2-byte boundary so we can just take hdrlen & 3 and pad by
 119          * the result.
 120          */
 121         skb_reserve(skb, hdrlen & 3);
 122
 123         /* If frame is small enough to fit in skb->head, pull it completely.
 124          * If not, only pull ieee80211_hdr (including crypto if present, and
 125          * an additional 8 bytes for SNAP/ethertype, see below) so that
 126          * splice() or TCP coalesce are more efficient.
 127          *
 128          * Since, in addition, ieee80211_data_to_8023() always pull in at
 129          * least 8 bytes (possibly more for mesh) we can do the same here
 130          * to save the cost of doing it later. That still doesn't pull in
 131          * the actual IP header since the typical case has a SNAP header.
 132          * If the latter changes (there are efforts in the standards group
 133          * to do so) we should revisit this and ieee80211_data_to_8023().
 134          */
 135         hdrlen = (len <= skb_tailroom(skb)) ? len : hdrlen + crypt_len + 8;
 136
 137         memcpy(skb_put(skb, hdrlen), hdr, hdrlen);
 138         fraglen = len - hdrlen;
 139
 140         if (fraglen) {
 141                 int offset = (void *)hdr + hdrlen -
 142                              rxb_addr(rxb) + rxb_offset(rxb);
 143
 144                 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
 145                                 fraglen, rxb->truesize);
 146         }
 147
 148         ieee80211_rx_napi(mvm->hw, sta, skb, napi);
 149 }
 150
 151 /*
 152  * iwl_mvm_get_signal_strength - use new rx PHY INFO API
 153  * values are reported by the fw as positive values - need to negate
 154  * to obtain their dBM.  Account for missing antennas by replacing 0
 155  * values by -256dBm: practically 0 power and a non-feasible 8 bit value.
 156  */
 157 static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm,
 158                                         struct iwl_rx_phy_info *phy_info,
 159                                         struct ieee80211_rx_status *rx_status)
 160 {
 161         int energy_a, energy_b, energy_c, max_energy;
 162         u32 val;
 163
 164         val =
 165             le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_ENERGY_ANT_ABC_IDX]);
 166         energy_a = (val & IWL_RX_INFO_ENERGY_ANT_A_MSK) >>
 167                                                 IWL_RX_INFO_ENERGY_ANT_A_POS;
 168         energy_a = energy_a ? -energy_a : S8_MIN;
 169         energy_b = (val & IWL_RX_INFO_ENERGY_ANT_B_MSK) >>
 170                                                 IWL_RX_INFO_ENERGY_ANT_B_POS;
 171         energy_b = energy_b ? -energy_b : S8_MIN;
 172         energy_c = (val & IWL_RX_INFO_ENERGY_ANT_C_MSK) >>
 173                                                 IWL_RX_INFO_ENERGY_ANT_C_POS;
 174         energy_c = energy_c ? -energy_c : S8_MIN;
 175         max_energy = max(energy_a, energy_b);
 176         max_energy = max(max_energy, energy_c);
 177
 178         IWL_DEBUG_STATS(mvm, "energy In A %d B %d C %d , and max %d\n",
 179                         energy_a, energy_b, energy_c, max_energy);
 180
 181         rx_status->signal = max_energy;
 182         rx_status->chains = (le16_to_cpu(phy_info->phy_flags) &
 183                                 RX_RES_PHY_FLAGS_ANTENNA)
 184                                         >> RX_RES_PHY_FLAGS_ANTENNA_POS;
 185         rx_status->chain_signal[0] = energy_a;
 186         rx_status->chain_signal[1] = energy_b;
 187         rx_status->chain_signal[2] = energy_c;
 188 }
 189
 190 /*
 191  * iwl_mvm_set_mac80211_rx_flag - translate fw status to mac80211 format
 192  * @mvm: the mvm object
 193  * @hdr: 80211 header
 194  * @stats: status in mac80211's format
 195  * @rx_pkt_status: status coming from fw
 196  *
 197  * returns non 0 value if the packet should be dropped
 198  */
 199 static u32 iwl_mvm_set_mac80211_rx_flag(struct iwl_mvm *mvm,
 200                                         struct ieee80211_hdr *hdr,
 201                                         struct ieee80211_rx_status *stats,
 202                                         u32 rx_pkt_status,
 203                                         u8 *crypt_len)
 204 {
 205         if (!ieee80211_has_protected(hdr->frame_control) ||
 206             (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 207                              RX_MPDU_RES_STATUS_SEC_NO_ENC)
 208                 return 0;
 209
 210         /* packet was encrypted with unknown alg */
 211         if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 212                                         RX_MPDU_RES_STATUS_SEC_ENC_ERR)
 213                 return 0;
 214
 215         switch (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) {
 216         case RX_MPDU_RES_STATUS_SEC_CCM_ENC:
 217                 /* alg is CCM: check MIC only */
 218                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
 219                         return -1;
 220
 221                 stats->flag |= RX_FLAG_DECRYPTED;
 222                 *crypt_len = IEEE80211_CCMP_HDR_LEN;
 223                 return 0;
 224
 225         case RX_MPDU_RES_STATUS_SEC_TKIP_ENC:
 226                 /* Don't drop the frame and decrypt it in SW */
 227                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_TTAK_OK))
 228                         return 0;
 229                 *crypt_len = IEEE80211_TKIP_IV_LEN;
 230                 /* fall through if TTAK OK */
 231
 232         case RX_MPDU_RES_STATUS_SEC_WEP_ENC:
 233                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_ICV_OK))
 234                         return -1;
 235
 236                 stats->flag |= RX_FLAG_DECRYPTED;
 237                 if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 238                                 RX_MPDU_RES_STATUS_SEC_WEP_ENC)
 239                         *crypt_len = IEEE80211_WEP_IV_LEN;
 240                 return 0;
 241
 242         case RX_MPDU_RES_STATUS_SEC_EXT_ENC:
 243                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
 244                         return -1;
 245                 stats->flag |= RX_FLAG_DECRYPTED;
 246                 return 0;
 247
 248         default:
 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 = get_unaligned_le32((__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 >= IWL_MVM_STATION_COUNT)) {
 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, mvmsta->vif,
 402                                                               trig);
 403                         if (trig_check && rx_status->signal < rssi)
 404                                 iwl_mvm_fw_dbg_collect_trig(mvm, trig, NULL);
 405                 }
 406
 407                 if (ieee80211_is_data(hdr->frame_control))
 408                         iwl_mvm_rx_csum(sta, skb, rx_pkt_status);
 409         }
 410         rcu_read_unlock();
 411
 412         /* set the preamble flag if appropriate */
 413         if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_SHORT_PREAMBLE))
 414                 rx_status->flag |= RX_FLAG_SHORTPRE;
 415
 416         if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
 417                 /*
 418                  * We know which subframes of an A-MPDU belong
 419                  * together since we get a single PHY response
 420                  * from the firmware for all of them
 421                  */
 422                 rx_status->flag |= RX_FLAG_AMPDU_DETAILS;
 423                 rx_status->ampdu_reference = mvm->ampdu_ref;
 424         }
 425
 426         /* Set up the HT phy flags */
 427         switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
 428         case RATE_MCS_CHAN_WIDTH_20:
 429                 break;
 430         case RATE_MCS_CHAN_WIDTH_40:
 431                 rx_status->flag |= RX_FLAG_40MHZ;
 432                 break;
 433         case RATE_MCS_CHAN_WIDTH_80:
 434                 rx_status->vht_flag |= RX_VHT_FLAG_80MHZ;
 435                 break;
 436         case RATE_MCS_CHAN_WIDTH_160:
 437                 rx_status->vht_flag |= RX_VHT_FLAG_160MHZ;
 438                 break;
 439         }
 440         if (rate_n_flags & RATE_MCS_SGI_MSK)
 441                 rx_status->flag |= RX_FLAG_SHORT_GI;
 442         if (rate_n_flags & RATE_HT_MCS_GF_MSK)
 443                 rx_status->flag |= RX_FLAG_HT_GF;
 444         if (rate_n_flags & RATE_MCS_LDPC_MSK)
 445                 rx_status->flag |= RX_FLAG_LDPC;
 446         if (rate_n_flags & RATE_MCS_HT_MSK) {
 447                 u8 stbc = (rate_n_flags & RATE_MCS_HT_STBC_MSK) >>
 448                                 RATE_MCS_STBC_POS;
 449                 rx_status->flag |= RX_FLAG_HT;
 450                 rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
 451                 rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT;
 452         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 453                 u8 stbc = (rate_n_flags & RATE_MCS_VHT_STBC_MSK) >>
 454                                 RATE_MCS_STBC_POS;
 455                 rx_status->vht_nss =
 456                         ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
 457                                                 RATE_VHT_MCS_NSS_POS) + 1;
 458                 rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 459                 rx_status->flag |= RX_FLAG_VHT;
 460                 rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT;
 461                 if (rate_n_flags & RATE_MCS_BF_MSK)
 462                         rx_status->vht_flag |= RX_VHT_FLAG_BF;
 463         } else {
 464                 rx_status->rate_idx =
 465                         iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
 466                                                             rx_status->band);
 467         }
 468
 469 #ifdef CONFIG_IWLWIFI_DEBUGFS
 470         iwl_mvm_update_frame_stats(mvm, rate_n_flags,
 471                                    rx_status->flag & RX_FLAG_AMPDU_DETAILS);
 472 #endif
 473
 474         if (unlikely((ieee80211_is_beacon(hdr->frame_control) ||
 475                       ieee80211_is_probe_resp(hdr->frame_control)) &&
 476                      mvm->sched_scan_pass_all == SCHED_SCAN_PASS_ALL_ENABLED))
 477                 mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_FOUND;
 478
 479         if (unlikely(ieee80211_is_beacon(hdr->frame_control) ||
 480                      ieee80211_is_probe_resp(hdr->frame_control)))
 481                 rx_status->boottime_ns = ktime_get_boot_ns();
 482
 483         /* Take a reference briefly to kick off a d0i3 entry delay so
 484          * we can handle bursts of RX packets without toggling the
 485          * state too often.  But don't do this for beacons if we are
 486          * going to idle because the beacon filtering changes we make
 487          * cause the firmware to send us collateral beacons. */
 488         take_ref = !(test_bit(STATUS_TRANS_GOING_IDLE, &mvm->trans->status) &&
 489                      ieee80211_is_beacon(hdr->frame_control));
 490
 491         if (take_ref)
 492                 iwl_mvm_ref(mvm, IWL_MVM_REF_RX);
 493
 494         iwl_mvm_pass_packet_to_mac80211(mvm, sta, napi, skb, hdr, len,
 495                                         crypt_len, rxb);
 496
 497         if (take_ref)
 498                 iwl_mvm_unref(mvm, IWL_MVM_REF_RX);
 499 }
 500
 501 static void iwl_mvm_update_rx_statistics(struct iwl_mvm *mvm,
 502                                          struct mvm_statistics_rx *rx_stats)
 503 {
 504         lockdep_assert_held(&mvm->mutex);
 505
 506         mvm->rx_stats = *rx_stats;
 507 }
 508
 509 struct iwl_mvm_stat_data {
 510         struct iwl_mvm *mvm;
 511         __le32 mac_id;
 512         u8 beacon_filter_average_energy;
 513         struct mvm_statistics_general_v8 *general;
 514         struct mvm_statistics_load *load;
 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                 mvmvif->beacon_stats.num_beacons =
 535                         le32_to_cpu(data->general->beacon_counter[mvmvif->id]);
 536                 mvmvif->beacon_stats.avg_signal =
 537                         -data->general->beacon_average_energy[mvmvif->id];
 538         }
 539
 540         if (mvmvif->id != id)
 541                 return;
 542
 543         if (vif->type != NL80211_IFTYPE_STATION)
 544                 return;
 545
 546         if (sig == 0) {
 547                 IWL_DEBUG_RX(mvm, "RSSI is 0 - skip signal based decision\n");
 548                 return;
 549         }
 550
 551         mvmvif->bf_data.ave_beacon_signal = sig;
 552
 553         /* BT Coex */
 554         if (mvmvif->bf_data.bt_coex_min_thold !=
 555             mvmvif->bf_data.bt_coex_max_thold) {
 556                 last_event = mvmvif->bf_data.last_bt_coex_event;
 557                 if (sig > mvmvif->bf_data.bt_coex_max_thold &&
 558                     (last_event <= mvmvif->bf_data.bt_coex_min_thold ||
 559                      last_event == 0)) {
 560                         mvmvif->bf_data.last_bt_coex_event = sig;
 561                         IWL_DEBUG_RX(mvm, "cqm_iterator bt coex high %d\n",
 562                                      sig);
 563                         iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_HIGH);
 564                 } else if (sig < mvmvif->bf_data.bt_coex_min_thold &&
 565                            (last_event >= mvmvif->bf_data.bt_coex_max_thold ||
 566                             last_event == 0)) {
 567                         mvmvif->bf_data.last_bt_coex_event = sig;
 568                         IWL_DEBUG_RX(mvm, "cqm_iterator bt coex low %d\n",
 569                                      sig);
 570                         iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_LOW);
 571                 }
 572         }
 573
 574         if (!(vif->driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI))
 575                 return;
 576
 577         /* CQM Notification */
 578         last_event = mvmvif->bf_data.last_cqm_event;
 579         if (thold && sig < thold && (last_event == 0 ||
 580                                      sig < last_event - hyst)) {
 581                 mvmvif->bf_data.last_cqm_event = sig;
 582                 IWL_DEBUG_RX(mvm, "cqm_iterator cqm low %d\n",
 583                              sig);
 584                 ieee80211_cqm_rssi_notify(
 585                         vif,
 586                         NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
 587                         GFP_KERNEL);
 588         } else if (sig > thold &&
 589                    (last_event == 0 || sig > last_event + hyst)) {
 590                 mvmvif->bf_data.last_cqm_event = sig;
 591                 IWL_DEBUG_RX(mvm, "cqm_iterator cqm high %d\n",
 592                              sig);
 593                 ieee80211_cqm_rssi_notify(
 594                         vif,
 595                         NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
 596                         GFP_KERNEL);
 597         }
 598 }
 599
 600 static inline void
 601 iwl_mvm_rx_stats_check_trigger(struct iwl_mvm *mvm, struct iwl_rx_packet *pkt)
 602 {
 603         struct iwl_fw_dbg_trigger_tlv *trig;
 604         struct iwl_fw_dbg_trigger_stats *trig_stats;
 605         u32 trig_offset, trig_thold;
 606
 607         if (!iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_STATS))
 608                 return;
 609
 610         trig = iwl_fw_dbg_get_trigger(mvm->fw, FW_DBG_TRIGGER_STATS);
 611         trig_stats = (void *)trig->data;
 612
 613         if (!iwl_fw_dbg_trigger_check_stop(mvm, NULL, trig))
 614                 return;
 615
 616         trig_offset = le32_to_cpu(trig_stats->stop_offset);
 617         trig_thold = le32_to_cpu(trig_stats->stop_threshold);
 618
 619         if (WARN_ON_ONCE(trig_offset >= iwl_rx_packet_payload_len(pkt)))
 620                 return;
 621
 622         if (le32_to_cpup((__le32 *) (pkt->data + trig_offset)) < trig_thold)
 623                 return;
 624
 625         iwl_mvm_fw_dbg_collect_trig(mvm, trig, NULL);
 626 }
 627
 628 void iwl_mvm_handle_rx_statistics(struct iwl_mvm *mvm,
 629                                   struct iwl_rx_packet *pkt)
 630 {
 631         struct iwl_notif_statistics_v11 *stats = (void *)&pkt->data;
 632         struct iwl_mvm_stat_data data = {
 633                 .mvm = mvm,
 634         };
 635         int expected_size = iwl_mvm_has_new_rx_api(mvm) ? sizeof(*stats) :
 636                             sizeof(struct iwl_notif_statistics_v10);
 637         u32 temperature;
 638
 639         if (iwl_rx_packet_payload_len(pkt) != expected_size)
 640                 goto invalid;
 641
 642         temperature = le32_to_cpu(stats->general.radio_temperature);
 643         data.mac_id = stats->rx.general.mac_id;
 644         data.beacon_filter_average_energy =
 645                 stats->general.beacon_filter_average_energy;
 646
 647         iwl_mvm_update_rx_statistics(mvm, &stats->rx);
 648
 649         mvm->radio_stats.rx_time = le64_to_cpu(stats->general.rx_time);
 650         mvm->radio_stats.tx_time = le64_to_cpu(stats->general.tx_time);
 651         mvm->radio_stats.on_time_rf =
 652                 le64_to_cpu(stats->general.on_time_rf);
 653         mvm->radio_stats.on_time_scan =
 654                 le64_to_cpu(stats->general.on_time_scan);
 655
 656         data.general = &stats->general;
 657         if (iwl_mvm_has_new_rx_api(mvm)) {
 658                 int i;
 659
 660                 data.load = &stats->load_stats;
 661
 662                 rcu_read_lock();
 663                 for (i = 0; i < IWL_MVM_STATION_COUNT; i++) {
 664                         struct iwl_mvm_sta *sta;
 665
 666                         if (!data.load->avg_energy[i])
 667                                 continue;
 668
 669                         sta = iwl_mvm_sta_from_staid_rcu(mvm, i);
 670                         if (!sta)
 671                                 continue;
 672                         sta->avg_energy = data.load->avg_energy[i];
 673                 }
 674                 rcu_read_unlock();
 675         }
 676
 677         iwl_mvm_rx_stats_check_trigger(mvm, pkt);
 678
 679         ieee80211_iterate_active_interfaces(mvm->hw,
 680                                             IEEE80211_IFACE_ITER_NORMAL,
 681                                             iwl_mvm_stat_iterator,
 682                                             &data);
 683         return;
 684  invalid:
 685         IWL_ERR(mvm, "received invalid statistics size (%d)!\n",
 686                 iwl_rx_packet_payload_len(pkt));
 687 }
 688
 689 void iwl_mvm_rx_statistics(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
 690 {
 691         iwl_mvm_handle_rx_statistics(mvm, rxb_addr(rxb));
 692 }
 693
 694 void iwl_mvm_window_status_notif(struct iwl_mvm *mvm,
 695                                  struct iwl_rx_cmd_buffer *rxb)
 696 {
 697         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 698         struct iwl_ba_window_status_notif *notif = (void *)pkt->data;
 699         int i;
 700         u32 pkt_len = iwl_rx_packet_payload_len(pkt);
 701
 702         if (WARN_ONCE(pkt_len != sizeof(*notif),
 703                       "Received window status notification of wrong size (%u)\n",
 704                       pkt_len))
 705                 return;
 706
 707         rcu_read_lock();
 708         for (i = 0; i < BA_WINDOW_STREAMS_MAX; i++) {
 709                 struct ieee80211_sta *sta;
 710                 u8 sta_id, tid;
 711                 u64 bitmap;
 712                 u32 ssn;
 713                 u16 ratid;
 714                 u16 received_mpdu;
 715
 716                 ratid = le16_to_cpu(notif->ra_tid[i]);
 717                 /* check that this TID is valid */
 718                 if (!(ratid & BA_WINDOW_STATUS_VALID_MSK))
 719                         continue;
 720
 721                 received_mpdu = le16_to_cpu(notif->mpdu_rx_count[i]);
 722                 if (received_mpdu == 0)
 723                         continue;
 724
 725                 tid = ratid & BA_WINDOW_STATUS_TID_MSK;
 726                 /* get the station */
 727                 sta_id = (ratid & BA_WINDOW_STATUS_STA_ID_MSK)
 728                          >> BA_WINDOW_STATUS_STA_ID_POS;
 729                 sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
 730                 if (IS_ERR_OR_NULL(sta))
 731                         continue;
 732                 bitmap = le64_to_cpu(notif->bitmap[i]);
 733                 ssn = le32_to_cpu(notif->start_seq_num[i]);
 734
 735                 /* update mac80211 with the bitmap for the reordering buffer */
 736                 ieee80211_mark_rx_ba_filtered_frames(sta, tid, ssn, bitmap,
 737                                                      received_mpdu);
 738         }
 739         rcu_read_unlock();
 740 }