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  * The full GNU General Public License is included in this distribution
  22  * in the file called COPYING.
  23  *
  24  * Contact Information:
  25  *  Intel Linux Wireless <linuxwifi@intel.com>
  26  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  27  *
  28  * BSD LICENSE
  29  *
  30  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  31  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
  32  * All rights reserved.
  33  *
  34  * Redistribution and use in source and binary forms, with or without
  35  * modification, are permitted provided that the following conditions
  36  * are met:
  37  *
  38  *  * Redistributions of source code must retain the above copyright
  39  *    notice, this list of conditions and the following disclaimer.
  40  *  * Redistributions in binary form must reproduce the above copyright
  41  *    notice, this list of conditions and the following disclaimer in
  42  *    the documentation and/or other materials provided with the
  43  *    distribution.
  44  *  * Neither the name Intel Corporation nor the names of its
  45  *    contributors may be used to endorse or promote products derived
  46  *    from this software without specific prior written permission.
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  49  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  50  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  51  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  52  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  53  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  54  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  55  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  56  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  57  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  58  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  59  *****************************************************************************/
  60 #include <linux/etherdevice.h>
  61 #include <linux/skbuff.h>
  62 #include "iwl-trans.h"
  63 #include "mvm.h"
  64 #include "fw-api.h"
  65
  66 /*
  67  * iwl_mvm_rx_rx_phy_cmd - REPLY_RX_PHY_CMD handler
  68  *
  69  * Copies the phy information in mvm->last_phy_info, it will be used when the
  70  * actual data will come from the fw in the next packet.
  71  */
  72 void iwl_mvm_rx_rx_phy_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
  73 {
  74         struct iwl_rx_packet *pkt = rxb_addr(rxb);
  75
  76         memcpy(&mvm->last_phy_info, pkt->data, sizeof(mvm->last_phy_info));
  77         mvm->ampdu_ref++;
  78
  79 #ifdef CONFIG_IWLWIFI_DEBUGFS
  80         if (mvm->last_phy_info.phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
  81                 spin_lock(&mvm->drv_stats_lock);
  82                 mvm->drv_rx_stats.ampdu_count++;
  83                 spin_unlock(&mvm->drv_stats_lock);
  84         }
  85 #endif
  86 }
  87
  88 /*
  89  * iwl_mvm_pass_packet_to_mac80211 - builds the packet for mac80211
  90  *
  91  * Adds the rxb to a new skb and give it to mac80211
  92  */
  93 static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm,
  94                                             struct ieee80211_sta *sta,
  95                                             struct napi_struct *napi,
  96                                             struct sk_buff *skb,
  97                                             struct ieee80211_hdr *hdr, u16 len,
  98                                             u8 crypt_len,
  99                                             struct iwl_rx_cmd_buffer *rxb)
 100 {
 101         unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
 102         unsigned int fraglen;
 103
 104         /*
 105          * The 'hdrlen' (plus the 8 bytes for the SNAP and the crypt_len,
 106          * but those are all multiples of 4 long) all goes away, but we
 107          * want the *end* of it, which is going to be the start of the IP
 108          * header, to be aligned when it gets pulled in.
 109          * The beginning of the skb->data is aligned on at least a 4-byte
 110          * boundary after allocation. Everything here is aligned at least
 111          * on a 2-byte boundary so we can just take hdrlen & 3 and pad by
 112          * the result.
 113          */
 114         skb_reserve(skb, hdrlen & 3);
 115
 116         /* If frame is small enough to fit in skb->head, pull it completely.
 117          * If not, only pull ieee80211_hdr (including crypto if present, and
 118          * an additional 8 bytes for SNAP/ethertype, see below) so that
 119          * splice() or TCP coalesce are more efficient.
 120          *
 121          * Since, in addition, ieee80211_data_to_8023() always pull in at
 122          * least 8 bytes (possibly more for mesh) we can do the same here
 123          * to save the cost of doing it later. That still doesn't pull in
 124          * the actual IP header since the typical case has a SNAP header.
 125          * If the latter changes (there are efforts in the standards group
 126          * to do so) we should revisit this and ieee80211_data_to_8023().
 127          */
 128         hdrlen = (len <= skb_tailroom(skb)) ? len : hdrlen + crypt_len + 8;
 129
 130         skb_put_data(skb, hdr, hdrlen);
 131         fraglen = len - hdrlen;
 132
 133         if (fraglen) {
 134                 int offset = (void *)hdr + hdrlen -
 135                              rxb_addr(rxb) + rxb_offset(rxb);
 136
 137                 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
 138                                 fraglen, rxb->truesize);
 139         }
 140
 141         ieee80211_rx_napi(mvm->hw, sta, skb, napi);
 142 }
 143
 144 /*
 145  * iwl_mvm_get_signal_strength - use new rx PHY INFO API
 146  * values are reported by the fw as positive values - need to negate
 147  * to obtain their dBM.  Account for missing antennas by replacing 0
 148  * values by -256dBm: practically 0 power and a non-feasible 8 bit value.
 149  */
 150 static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm,
 151                                         struct iwl_rx_phy_info *phy_info,
 152                                         struct ieee80211_rx_status *rx_status)
 153 {
 154         int energy_a, energy_b, energy_c, max_energy;
 155         u32 val;
 156
 157         val =
 158             le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_ENERGY_ANT_ABC_IDX]);
 159         energy_a = (val & IWL_RX_INFO_ENERGY_ANT_A_MSK) >>
 160                                                 IWL_RX_INFO_ENERGY_ANT_A_POS;
 161         energy_a = energy_a ? -energy_a : S8_MIN;
 162         energy_b = (val & IWL_RX_INFO_ENERGY_ANT_B_MSK) >>
 163                                                 IWL_RX_INFO_ENERGY_ANT_B_POS;
 164         energy_b = energy_b ? -energy_b : S8_MIN;
 165         energy_c = (val & IWL_RX_INFO_ENERGY_ANT_C_MSK) >>
 166                                                 IWL_RX_INFO_ENERGY_ANT_C_POS;
 167         energy_c = energy_c ? -energy_c : S8_MIN;
 168         max_energy = max(energy_a, energy_b);
 169         max_energy = max(max_energy, energy_c);
 170
 171         IWL_DEBUG_STATS(mvm, "energy In A %d B %d C %d , and max %d\n",
 172                         energy_a, energy_b, energy_c, max_energy);
 173
 174         rx_status->signal = max_energy;
 175         rx_status->chains = (le16_to_cpu(phy_info->phy_flags) &
 176                                 RX_RES_PHY_FLAGS_ANTENNA)
 177                                         >> RX_RES_PHY_FLAGS_ANTENNA_POS;
 178         rx_status->chain_signal[0] = energy_a;
 179         rx_status->chain_signal[1] = energy_b;
 180         rx_status->chain_signal[2] = energy_c;
 181 }
 182
 183 /*
 184  * iwl_mvm_set_mac80211_rx_flag - translate fw status to mac80211 format
 185  * @mvm: the mvm object
 186  * @hdr: 80211 header
 187  * @stats: status in mac80211's format
 188  * @rx_pkt_status: status coming from fw
 189  *
 190  * returns non 0 value if the packet should be dropped
 191  */
 192 static u32 iwl_mvm_set_mac80211_rx_flag(struct iwl_mvm *mvm,
 193                                         struct ieee80211_hdr *hdr,
 194                                         struct ieee80211_rx_status *stats,
 195                                         u32 rx_pkt_status,
 196                                         u8 *crypt_len)
 197 {
 198         if (!ieee80211_has_protected(hdr->frame_control) ||
 199             (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 200                              RX_MPDU_RES_STATUS_SEC_NO_ENC)
 201                 return 0;
 202
 203         /* packet was encrypted with unknown alg */
 204         if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 205                                         RX_MPDU_RES_STATUS_SEC_ENC_ERR)
 206                 return 0;
 207
 208         switch (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) {
 209         case RX_MPDU_RES_STATUS_SEC_CCM_ENC:
 210                 /* alg is CCM: check MIC only */
 211                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
 212                         return -1;
 213
 214                 stats->flag |= RX_FLAG_DECRYPTED;
 215                 *crypt_len = IEEE80211_CCMP_HDR_LEN;
 216                 return 0;
 217
 218         case RX_MPDU_RES_STATUS_SEC_TKIP_ENC:
 219                 /* Don't drop the frame and decrypt it in SW */
 220                 if (!fw_has_api(&mvm->fw->ucode_capa,
 221                                 IWL_UCODE_TLV_API_DEPRECATE_TTAK) &&
 222                     !(rx_pkt_status & RX_MPDU_RES_STATUS_TTAK_OK))
 223                         return 0;
 224                 *crypt_len = IEEE80211_TKIP_IV_LEN;
 225                 /* fall through if TTAK OK */
 226
 227         case RX_MPDU_RES_STATUS_SEC_WEP_ENC:
 228                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_ICV_OK))
 229                         return -1;
 230
 231                 stats->flag |= RX_FLAG_DECRYPTED;
 232                 if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 233                                 RX_MPDU_RES_STATUS_SEC_WEP_ENC)
 234                         *crypt_len = IEEE80211_WEP_IV_LEN;
 235                 return 0;
 236
 237         case RX_MPDU_RES_STATUS_SEC_EXT_ENC:
 238                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
 239                         return -1;
 240                 stats->flag |= RX_FLAG_DECRYPTED;
 241                 return 0;
 242
 243         default:
 244                 /* Expected in monitor (not having the keys) */
 245                 if (!mvm->monitor_on)
 246                         IWL_ERR(mvm, "Unhandled alg: 0x%x\n", rx_pkt_status);
 247         }
 248
 249         return 0;
 250 }
 251
 252 static void iwl_mvm_rx_handle_tcm(struct iwl_mvm *mvm,
 253                                   struct ieee80211_sta *sta,
 254                                   struct ieee80211_hdr *hdr, u32 len,
 255                                   struct iwl_rx_phy_info *phy_info,
 256                                   u32 rate_n_flags)
 257 {
 258         struct iwl_mvm_sta *mvmsta;
 259         struct iwl_mvm_tcm_mac *mdata;
 260         int mac;
 261         int ac = IEEE80211_AC_BE; /* treat non-QoS as BE */
 262         struct iwl_mvm_vif *mvmvif;
 263         /* expected throughput in 100Kbps, single stream, 20 MHz */
 264         static const u8 thresh_tpt[] = {
 265                 9, 18, 30, 42, 60, 78, 90, 96, 120, 135,
 266         };
 267         u16 thr;
 268
 269         if (ieee80211_is_data_qos(hdr->frame_control))
 270                 ac = tid_to_mac80211_ac[ieee80211_get_tid(hdr)];
 271
 272         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 273         mac = mvmsta->mac_id_n_color & FW_CTXT_ID_MSK;
 274
 275         if (time_after(jiffies, mvm->tcm.ts + MVM_TCM_PERIOD))
 276                 schedule_delayed_work(&mvm->tcm.work, 0);
 277         mdata = &mvm->tcm.data[mac];
 278         mdata->rx.pkts[ac]++;
 279
 280         /* count the airtime only once for each ampdu */
 281         if (mdata->rx.last_ampdu_ref != mvm->ampdu_ref) {
 282                 mdata->rx.last_ampdu_ref = mvm->ampdu_ref;
 283                 mdata->rx.airtime += le16_to_cpu(phy_info->frame_time);
 284         }
 285
 286         if (!(rate_n_flags & (RATE_MCS_HT_MSK | RATE_MCS_VHT_MSK)))
 287                 return;
 288
 289         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
 290
 291         if (mdata->opened_rx_ba_sessions ||
 292             mdata->uapsd_nonagg_detect.detected ||
 293             (!mvmvif->queue_params[IEEE80211_AC_VO].uapsd &&
 294              !mvmvif->queue_params[IEEE80211_AC_VI].uapsd &&
 295              !mvmvif->queue_params[IEEE80211_AC_BE].uapsd &&
 296              !mvmvif->queue_params[IEEE80211_AC_BK].uapsd) ||
 297             mvmsta->sta_id != mvmvif->ap_sta_id)
 298                 return;
 299
 300         if (rate_n_flags & RATE_MCS_HT_MSK) {
 301                 thr = thresh_tpt[rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK];
 302                 thr *= 1 + ((rate_n_flags & RATE_HT_MCS_NSS_MSK) >>
 303                                         RATE_HT_MCS_NSS_POS);
 304         } else {
 305                 if (WARN_ON((rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK) >=
 306                                 ARRAY_SIZE(thresh_tpt)))
 307                         return;
 308                 thr = thresh_tpt[rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK];
 309                 thr *= 1 + ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
 310                                         RATE_VHT_MCS_NSS_POS);
 311         }
 312
 313         thr <<= ((rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) >>
 314                                 RATE_MCS_CHAN_WIDTH_POS);
 315
 316         mdata->uapsd_nonagg_detect.rx_bytes += len;
 317         ewma_rate_add(&mdata->uapsd_nonagg_detect.rate, thr);
 318 }
 319
 320 static void iwl_mvm_rx_csum(struct ieee80211_sta *sta,
 321                             struct sk_buff *skb,
 322                             u32 status)
 323 {
 324         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 325         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
 326
 327         if (mvmvif->features & NETIF_F_RXCSUM &&
 328             status & RX_MPDU_RES_STATUS_CSUM_DONE &&
 329             status & RX_MPDU_RES_STATUS_CSUM_OK)
 330                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 331 }
 332
 333 /*
 334  * iwl_mvm_rx_rx_mpdu - REPLY_RX_MPDU_CMD handler
 335  *
 336  * Handles the actual data of the Rx packet from the fw
 337  */
 338 void iwl_mvm_rx_rx_mpdu(struct iwl_mvm *mvm, struct napi_struct *napi,
 339                         struct iwl_rx_cmd_buffer *rxb)
 340 {
 341         struct ieee80211_hdr *hdr;
 342         struct ieee80211_rx_status *rx_status;
 343         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 344         struct iwl_rx_phy_info *phy_info;
 345         struct iwl_rx_mpdu_res_start *rx_res;
 346         struct ieee80211_sta *sta = NULL;
 347         struct sk_buff *skb;
 348         u32 len;
 349         u32 rate_n_flags;
 350         u32 rx_pkt_status;
 351         u8 crypt_len = 0;
 352         bool take_ref;
 353
 354         phy_info = &mvm->last_phy_info;
 355         rx_res = (struct iwl_rx_mpdu_res_start *)pkt->data;
 356         hdr = (struct ieee80211_hdr *)(pkt->data + sizeof(*rx_res));
 357         len = le16_to_cpu(rx_res->byte_count);
 358         rx_pkt_status = le32_to_cpup((__le32 *)
 359                 (pkt->data + sizeof(*rx_res) + len));
 360
 361         /* Dont use dev_alloc_skb(), we'll have enough headroom once
 362          * ieee80211_hdr pulled.
 363          */
 364         skb = alloc_skb(128, GFP_ATOMIC);
 365         if (!skb) {
 366                 IWL_ERR(mvm, "alloc_skb failed\n");
 367                 return;
 368         }
 369
 370         rx_status = IEEE80211_SKB_RXCB(skb);
 371
 372         /*
 373          * drop the packet if it has failed being decrypted by HW
 374          */
 375         if (iwl_mvm_set_mac80211_rx_flag(mvm, hdr, rx_status, rx_pkt_status,
 376                                          &crypt_len)) {
 377                 IWL_DEBUG_DROP(mvm, "Bad decryption results 0x%08x\n",
 378                                rx_pkt_status);
 379                 kfree_skb(skb);
 380                 return;
 381         }
 382
 383         /*
 384          * Keep packets with CRC errors (and with overrun) for monitor mode
 385          * (otherwise the firmware discards them) but mark them as bad.
 386          */
 387         if (!(rx_pkt_status & RX_MPDU_RES_STATUS_CRC_OK) ||
 388             !(rx_pkt_status & RX_MPDU_RES_STATUS_OVERRUN_OK)) {
 389                 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n", rx_pkt_status);
 390                 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
 391         }
 392
 393         /* This will be used in several places later */
 394         rate_n_flags = le32_to_cpu(phy_info->rate_n_flags);
 395
 396         /* rx_status carries information about the packet to mac80211 */
 397         rx_status->mactime = le64_to_cpu(phy_info->timestamp);
 398         rx_status->device_timestamp = le32_to_cpu(phy_info->system_timestamp);
 399         rx_status->band =
 400                 (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_BAND_24)) ?
 401                                 NL80211_BAND_2GHZ : NL80211_BAND_5GHZ;
 402         rx_status->freq =
 403                 ieee80211_channel_to_frequency(le16_to_cpu(phy_info->channel),
 404                                                rx_status->band);
 405
 406         /* TSF as indicated by the firmware  is at INA time */
 407         rx_status->flag |= RX_FLAG_MACTIME_PLCP_START;
 408
 409         iwl_mvm_get_signal_strength(mvm, phy_info, rx_status);
 410
 411         IWL_DEBUG_STATS_LIMIT(mvm, "Rssi %d, TSF %llu\n", rx_status->signal,
 412                               (unsigned long long)rx_status->mactime);
 413
 414         rcu_read_lock();
 415         if (rx_pkt_status & RX_MPDU_RES_STATUS_SRC_STA_FOUND) {
 416                 u32 id = rx_pkt_status & RX_MPDU_RES_STATUS_STA_ID_MSK;
 417
 418                 id >>= RX_MDPU_RES_STATUS_STA_ID_SHIFT;
 419
 420                 if (!WARN_ON_ONCE(id >= ARRAY_SIZE(mvm->fw_id_to_mac_id))) {
 421                         sta = rcu_dereference(mvm->fw_id_to_mac_id[id]);
 422                         if (IS_ERR(sta))
 423                                 sta = NULL;
 424                 }
 425         } else if (!is_multicast_ether_addr(hdr->addr2)) {
 426                 /* This is fine since we prevent two stations with the same
 427                  * address from being added.
 428                  */
 429                 sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL);
 430         }
 431
 432         if (sta) {
 433                 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 434                 struct ieee80211_vif *tx_blocked_vif =
 435                         rcu_dereference(mvm->csa_tx_blocked_vif);
 436                 struct iwl_fw_dbg_trigger_tlv *trig;
 437                 struct ieee80211_vif *vif = mvmsta->vif;
 438
 439                 /* We have tx blocked stations (with CS bit). If we heard
 440                  * frames from a blocked station on a new channel we can
 441                  * TX to it again.
 442                  */
 443                 if (unlikely(tx_blocked_vif) && vif == tx_blocked_vif) {
 444                         struct iwl_mvm_vif *mvmvif =
 445                                 iwl_mvm_vif_from_mac80211(tx_blocked_vif);
 446
 447                         if (mvmvif->csa_target_freq == rx_status->freq)
 448                                 iwl_mvm_sta_modify_disable_tx_ap(mvm, sta,
 449                                                                  false);
 450                 }
 451
 452                 rs_update_last_rssi(mvm, mvmsta, rx_status);
 453
 454                 trig = iwl_fw_dbg_trigger_on(&mvm->fwrt,
 455                                              ieee80211_vif_to_wdev(vif),
 456                                              FW_DBG_TRIGGER_RSSI);
 457
 458                 if (trig && ieee80211_is_beacon(hdr->frame_control)) {
 459                         struct iwl_fw_dbg_trigger_low_rssi *rssi_trig;
 460                         s32 rssi;
 461
 462                         rssi_trig = (void *)trig->data;
 463                         rssi = le32_to_cpu(rssi_trig->rssi);
 464
 465                         if (rx_status->signal < rssi)
 466                                 iwl_fw_dbg_collect_trig(&mvm->fwrt, trig,
 467                                                         NULL);
 468                 }
 469
 470                 if (!mvm->tcm.paused && len >= sizeof(*hdr) &&
 471                     !is_multicast_ether_addr(hdr->addr1) &&
 472                     ieee80211_is_data(hdr->frame_control))
 473                         iwl_mvm_rx_handle_tcm(mvm, sta, hdr, len, phy_info,
 474                                               rate_n_flags);
 475
 476                 if (ieee80211_is_data(hdr->frame_control))
 477                         iwl_mvm_rx_csum(sta, skb, rx_pkt_status);
 478         }
 479         rcu_read_unlock();
 480
 481         /* set the preamble flag if appropriate */
 482         if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_SHORT_PREAMBLE))
 483                 rx_status->enc_flags |= RX_ENC_FLAG_SHORTPRE;
 484
 485         if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
 486                 /*
 487                  * We know which subframes of an A-MPDU belong
 488                  * together since we get a single PHY response
 489                  * from the firmware for all of them
 490                  */
 491                 rx_status->flag |= RX_FLAG_AMPDU_DETAILS;
 492                 rx_status->ampdu_reference = mvm->ampdu_ref;
 493         }
 494
 495         /* Set up the HT phy flags */
 496         switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
 497         case RATE_MCS_CHAN_WIDTH_20:
 498                 break;
 499         case RATE_MCS_CHAN_WIDTH_40:
 500                 rx_status->bw = RATE_INFO_BW_40;
 501                 break;
 502         case RATE_MCS_CHAN_WIDTH_80:
 503                 rx_status->bw = RATE_INFO_BW_80;
 504                 break;
 505         case RATE_MCS_CHAN_WIDTH_160:
 506                 rx_status->bw = RATE_INFO_BW_160;
 507                 break;
 508         }
 509         if (!(rate_n_flags & RATE_MCS_CCK_MSK) &&
 510             rate_n_flags & RATE_MCS_SGI_MSK)
 511                 rx_status->enc_flags |= RX_ENC_FLAG_SHORT_GI;
 512         if (rate_n_flags & RATE_HT_MCS_GF_MSK)
 513                 rx_status->enc_flags |= RX_ENC_FLAG_HT_GF;
 514         if (rate_n_flags & RATE_MCS_LDPC_MSK)
 515                 rx_status->enc_flags |= RX_ENC_FLAG_LDPC;
 516         if (rate_n_flags & RATE_MCS_HT_MSK) {
 517                 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >>
 518                                 RATE_MCS_STBC_POS;
 519                 rx_status->encoding = RX_ENC_HT;
 520                 rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
 521                 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT;
 522         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 523                 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >>
 524                                 RATE_MCS_STBC_POS;
 525                 rx_status->nss =
 526                         ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
 527                                                 RATE_VHT_MCS_NSS_POS) + 1;
 528                 rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 529                 rx_status->encoding = RX_ENC_VHT;
 530                 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT;
 531                 if (rate_n_flags & RATE_MCS_BF_MSK)
 532                         rx_status->enc_flags |= RX_ENC_FLAG_BF;
 533         } else {
 534                 int rate = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
 535                                                                rx_status->band);
 536
 537                 if (WARN(rate < 0 || rate > 0xFF,
 538                          "Invalid rate flags 0x%x, band %d,\n",
 539                          rate_n_flags, rx_status->band)) {
 540                         kfree_skb(skb);
 541                         return;
 542                 }
 543                 rx_status->rate_idx = rate;
 544         }
 545
 546 #ifdef CONFIG_IWLWIFI_DEBUGFS
 547         iwl_mvm_update_frame_stats(mvm, rate_n_flags,
 548                                    rx_status->flag & RX_FLAG_AMPDU_DETAILS);
 549 #endif
 550
 551         if (unlikely((ieee80211_is_beacon(hdr->frame_control) ||
 552                       ieee80211_is_probe_resp(hdr->frame_control)) &&
 553                      mvm->sched_scan_pass_all == SCHED_SCAN_PASS_ALL_ENABLED))
 554                 mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_FOUND;
 555
 556         if (unlikely(ieee80211_is_beacon(hdr->frame_control) ||
 557                      ieee80211_is_probe_resp(hdr->frame_control)))
 558                 rx_status->boottime_ns = ktime_get_boot_ns();
 559
 560         /* Take a reference briefly to kick off a d0i3 entry delay so
 561          * we can handle bursts of RX packets without toggling the
 562          * state too often.  But don't do this for beacons if we are
 563          * going to idle because the beacon filtering changes we make
 564          * cause the firmware to send us collateral beacons. */
 565         take_ref = !(test_bit(STATUS_TRANS_GOING_IDLE, &mvm->trans->status) &&
 566                      ieee80211_is_beacon(hdr->frame_control));
 567
 568         if (take_ref)
 569                 iwl_mvm_ref(mvm, IWL_MVM_REF_RX);
 570
 571         iwl_mvm_pass_packet_to_mac80211(mvm, sta, napi, skb, hdr, len,
 572                                         crypt_len, rxb);
 573
 574         if (take_ref)
 575                 iwl_mvm_unref(mvm, IWL_MVM_REF_RX);
 576 }
 577
 578 struct iwl_mvm_stat_data {
 579         struct iwl_mvm *mvm;
 580         __le32 mac_id;
 581         u8 beacon_filter_average_energy;
 582         void *general;
 583 };
 584
 585 static void iwl_mvm_stat_iterator(void *_data, u8 *mac,
 586                                   struct ieee80211_vif *vif)
 587 {
 588         struct iwl_mvm_stat_data *data = _data;
 589         struct iwl_mvm *mvm = data->mvm;
 590         int sig = -data->beacon_filter_average_energy;
 591         int last_event;
 592         int thold = vif->bss_conf.cqm_rssi_thold;
 593         int hyst = vif->bss_conf.cqm_rssi_hyst;
 594         u16 id = le32_to_cpu(data->mac_id);
 595         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 596
 597         /* This doesn't need the MAC ID check since it's not taking the
 598          * data copied into the "data" struct, but rather the data from
 599          * the notification directly.
 600          */
 601         if (data->general) {
 602                 u16 vif_id = mvmvif->id;
 603
 604                 if (iwl_mvm_is_cdb_supported(mvm)) {
 605                         struct mvm_statistics_general_cdb *general =
 606                                 data->general;
 607
 608                         mvmvif->beacon_stats.num_beacons =
 609                                 le32_to_cpu(general->beacon_counter[vif_id]);
 610                         mvmvif->beacon_stats.avg_signal =
 611                                 -general->beacon_average_energy[vif_id];
 612                 } else {
 613                         struct mvm_statistics_general_v8 *general =
 614                                 data->general;
 615
 616                         mvmvif->beacon_stats.num_beacons =
 617                                 le32_to_cpu(general->beacon_counter[vif_id]);
 618                         mvmvif->beacon_stats.avg_signal =
 619                                 -general->beacon_average_energy[vif_id];
 620                 }
 621         }
 622
 623         if (mvmvif->id != id)
 624                 return;
 625
 626         if (vif->type != NL80211_IFTYPE_STATION)
 627                 return;
 628
 629         if (sig == 0) {
 630                 IWL_DEBUG_RX(mvm, "RSSI is 0 - skip signal based decision\n");
 631                 return;
 632         }
 633
 634         mvmvif->bf_data.ave_beacon_signal = sig;
 635
 636         /* BT Coex */
 637         if (mvmvif->bf_data.bt_coex_min_thold !=
 638             mvmvif->bf_data.bt_coex_max_thold) {
 639                 last_event = mvmvif->bf_data.last_bt_coex_event;
 640                 if (sig > mvmvif->bf_data.bt_coex_max_thold &&
 641                     (last_event <= mvmvif->bf_data.bt_coex_min_thold ||
 642                      last_event == 0)) {
 643                         mvmvif->bf_data.last_bt_coex_event = sig;
 644                         IWL_DEBUG_RX(mvm, "cqm_iterator bt coex high %d\n",
 645                                      sig);
 646                         iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_HIGH);
 647                 } else if (sig < mvmvif->bf_data.bt_coex_min_thold &&
 648                            (last_event >= mvmvif->bf_data.bt_coex_max_thold ||
 649                             last_event == 0)) {
 650                         mvmvif->bf_data.last_bt_coex_event = sig;
 651                         IWL_DEBUG_RX(mvm, "cqm_iterator bt coex low %d\n",
 652                                      sig);
 653                         iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_LOW);
 654                 }
 655         }
 656
 657         if (!(vif->driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI))
 658                 return;
 659
 660         /* CQM Notification */
 661         last_event = mvmvif->bf_data.last_cqm_event;
 662         if (thold && sig < thold && (last_event == 0 ||
 663                                      sig < last_event - hyst)) {
 664                 mvmvif->bf_data.last_cqm_event = sig;
 665                 IWL_DEBUG_RX(mvm, "cqm_iterator cqm low %d\n",
 666                              sig);
 667                 ieee80211_cqm_rssi_notify(
 668                         vif,
 669                         NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
 670                         sig,
 671                         GFP_KERNEL);
 672         } else if (sig > thold &&
 673                    (last_event == 0 || sig > last_event + hyst)) {
 674                 mvmvif->bf_data.last_cqm_event = sig;
 675                 IWL_DEBUG_RX(mvm, "cqm_iterator cqm high %d\n",
 676                              sig);
 677                 ieee80211_cqm_rssi_notify(
 678                         vif,
 679                         NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
 680                         sig,
 681                         GFP_KERNEL);
 682         }
 683 }
 684
 685 static inline void
 686 iwl_mvm_rx_stats_check_trigger(struct iwl_mvm *mvm, struct iwl_rx_packet *pkt)
 687 {
 688         struct iwl_fw_dbg_trigger_tlv *trig;
 689         struct iwl_fw_dbg_trigger_stats *trig_stats;
 690         u32 trig_offset, trig_thold;
 691
 692         trig = iwl_fw_dbg_trigger_on(&mvm->fwrt, NULL, FW_DBG_TRIGGER_STATS);
 693         if (!trig)
 694                 return;
 695
 696         trig_stats = (void *)trig->data;
 697
 698         trig_offset = le32_to_cpu(trig_stats->stop_offset);
 699         trig_thold = le32_to_cpu(trig_stats->stop_threshold);
 700
 701         if (WARN_ON_ONCE(trig_offset >= iwl_rx_packet_payload_len(pkt)))
 702                 return;
 703
 704         if (le32_to_cpup((__le32 *) (pkt->data + trig_offset)) < trig_thold)
 705                 return;
 706
 707         iwl_fw_dbg_collect_trig(&mvm->fwrt, trig, NULL);
 708 }
 709
 710 void iwl_mvm_handle_rx_statistics(struct iwl_mvm *mvm,
 711                                   struct iwl_rx_packet *pkt)
 712 {
 713         struct iwl_mvm_stat_data data = {
 714                 .mvm = mvm,
 715         };
 716         int expected_size;
 717         int i;
 718         u8 *energy;
 719         __le32 *bytes;
 720         __le32 *air_time;
 721         __le32 flags;
 722
 723         if (!iwl_mvm_has_new_rx_stats_api(mvm)) {
 724                 if (iwl_mvm_has_new_rx_api(mvm))
 725                         expected_size = sizeof(struct iwl_notif_statistics_v11);
 726                 else
 727                         expected_size = sizeof(struct iwl_notif_statistics_v10);
 728         } else {
 729                 expected_size = sizeof(struct iwl_notif_statistics_cdb);
 730         }
 731
 732         if (WARN_ONCE(iwl_rx_packet_payload_len(pkt) != expected_size,
 733                       "received invalid statistics size (%d)!\n",
 734                       iwl_rx_packet_payload_len(pkt)))
 735                 return;
 736
 737         if (!iwl_mvm_has_new_rx_stats_api(mvm)) {
 738                 struct iwl_notif_statistics_v11 *stats = (void *)&pkt->data;
 739
 740                 data.mac_id = stats->rx.general.mac_id;
 741                 data.beacon_filter_average_energy =
 742                         stats->general.common.beacon_filter_average_energy;
 743
 744                 mvm->rx_stats_v3 = stats->rx;
 745
 746                 mvm->radio_stats.rx_time =
 747                         le64_to_cpu(stats->general.common.rx_time);
 748                 mvm->radio_stats.tx_time =
 749                         le64_to_cpu(stats->general.common.tx_time);
 750                 mvm->radio_stats.on_time_rf =
 751                         le64_to_cpu(stats->general.common.on_time_rf);
 752                 mvm->radio_stats.on_time_scan =
 753                         le64_to_cpu(stats->general.common.on_time_scan);
 754
 755                 data.general = &stats->general;
 756
 757                 flags = stats->flag;
 758         } else {
 759                 struct iwl_notif_statistics_cdb *stats = (void *)&pkt->data;
 760
 761                 data.mac_id = stats->rx.general.mac_id;
 762                 data.beacon_filter_average_energy =
 763                         stats->general.common.beacon_filter_average_energy;
 764
 765                 mvm->rx_stats = stats->rx;
 766
 767                 mvm->radio_stats.rx_time =
 768                         le64_to_cpu(stats->general.common.rx_time);
 769                 mvm->radio_stats.tx_time =
 770                         le64_to_cpu(stats->general.common.tx_time);
 771                 mvm->radio_stats.on_time_rf =
 772                         le64_to_cpu(stats->general.common.on_time_rf);
 773                 mvm->radio_stats.on_time_scan =
 774                         le64_to_cpu(stats->general.common.on_time_scan);
 775
 776                 data.general = &stats->general;
 777
 778                 flags = stats->flag;
 779         }
 780
 781         iwl_mvm_rx_stats_check_trigger(mvm, pkt);
 782
 783         ieee80211_iterate_active_interfaces(mvm->hw,
 784                                             IEEE80211_IFACE_ITER_NORMAL,
 785                                             iwl_mvm_stat_iterator,
 786                                             &data);
 787
 788         if (!iwl_mvm_has_new_rx_api(mvm))
 789                 return;
 790
 791         if (!iwl_mvm_has_new_rx_stats_api(mvm)) {
 792                 struct iwl_notif_statistics_v11 *v11 = (void *)&pkt->data;
 793
 794                 energy = (void *)&v11->load_stats.avg_energy;
 795                 bytes = (void *)&v11->load_stats.byte_count;
 796                 air_time = (void *)&v11->load_stats.air_time;
 797         } else {
 798                 struct iwl_notif_statistics_cdb *stats = (void *)&pkt->data;
 799
 800                 energy = (void *)&stats->load_stats.avg_energy;
 801                 bytes = (void *)&stats->load_stats.byte_count;
 802                 air_time = (void *)&stats->load_stats.air_time;
 803         }
 804
 805         rcu_read_lock();
 806         for (i = 0; i < ARRAY_SIZE(mvm->fw_id_to_mac_id); i++) {
 807                 struct iwl_mvm_sta *sta;
 808
 809                 if (!energy[i])
 810                         continue;
 811
 812                 sta = iwl_mvm_sta_from_staid_rcu(mvm, i);
 813                 if (!sta)
 814                         continue;
 815                 sta->avg_energy = energy[i];
 816         }
 817         rcu_read_unlock();
 818
 819         /*
 820          * Don't update in case the statistics are not cleared, since
 821          * we will end up counting twice the same airtime, once in TCM
 822          * request and once in statistics notification.
 823          */
 824         if (!(le32_to_cpu(flags) & IWL_STATISTICS_REPLY_FLG_CLEAR))
 825                 return;
 826
 827         spin_lock(&mvm->tcm.lock);
 828         for (i = 0; i < NUM_MAC_INDEX_DRIVER; i++) {
 829                 struct iwl_mvm_tcm_mac *mdata = &mvm->tcm.data[i];
 830                 u32 airtime = le32_to_cpu(air_time[i]);
 831                 u32 rx_bytes = le32_to_cpu(bytes[i]);
 832
 833                 mdata->uapsd_nonagg_detect.rx_bytes += rx_bytes;
 834                 if (airtime) {
 835                         /* re-init every time to store rate from FW */
 836                         ewma_rate_init(&mdata->uapsd_nonagg_detect.rate);
 837                         ewma_rate_add(&mdata->uapsd_nonagg_detect.rate,
 838                                       rx_bytes * 8 / airtime);
 839                 }
 840
 841                 mdata->rx.airtime += airtime;
 842         }
 843         spin_unlock(&mvm->tcm.lock);
 844 }
 845
 846 void iwl_mvm_rx_statistics(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
 847 {
 848         iwl_mvm_handle_rx_statistics(mvm, rxb_addr(rxb));
 849 }
 850
 851 void iwl_mvm_window_status_notif(struct iwl_mvm *mvm,
 852                                  struct iwl_rx_cmd_buffer *rxb)
 853 {
 854         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 855         struct iwl_ba_window_status_notif *notif = (void *)pkt->data;
 856         int i;
 857         u32 pkt_len = iwl_rx_packet_payload_len(pkt);
 858
 859         if (WARN_ONCE(pkt_len != sizeof(*notif),
 860                       "Received window status notification of wrong size (%u)\n",
 861                       pkt_len))
 862                 return;
 863
 864         rcu_read_lock();
 865         for (i = 0; i < BA_WINDOW_STREAMS_MAX; i++) {
 866                 struct ieee80211_sta *sta;
 867                 u8 sta_id, tid;
 868                 u64 bitmap;
 869                 u32 ssn;
 870                 u16 ratid;
 871                 u16 received_mpdu;
 872
 873                 ratid = le16_to_cpu(notif->ra_tid[i]);
 874                 /* check that this TID is valid */
 875                 if (!(ratid & BA_WINDOW_STATUS_VALID_MSK))
 876                         continue;
 877
 878                 received_mpdu = le16_to_cpu(notif->mpdu_rx_count[i]);
 879                 if (received_mpdu == 0)
 880                         continue;
 881
 882                 tid = ratid & BA_WINDOW_STATUS_TID_MSK;
 883                 /* get the station */
 884                 sta_id = (ratid & BA_WINDOW_STATUS_STA_ID_MSK)
 885                          >> BA_WINDOW_STATUS_STA_ID_POS;
 886                 sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
 887                 if (IS_ERR_OR_NULL(sta))
 888                         continue;
 889                 bitmap = le64_to_cpu(notif->bitmap[i]);
 890                 ssn = le32_to_cpu(notif->start_seq_num[i]);
 891
 892                 /* update mac80211 with the bitmap for the reordering buffer */
 893                 ieee80211_mark_rx_ba_filtered_frames(sta, tid, ssn, bitmap,
 894                                                      received_mpdu);
 895         }
 896         rcu_read_unlock();
 897 }