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.
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  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  24  * USA
  25  *
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  27  * in the file called COPYING.
  28  *
  29  * Contact Information:
  30  *  Intel Linux Wireless <linuxwifi@intel.com>
  31  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  32  *
  33  * BSD LICENSE
  34  *
  35  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  36  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
  37  * All rights reserved.
  38  *
  39  * Redistribution and use in source and binary forms, with or without
  40  * modification, are permitted provided that the following conditions
  41  * are met:
  42  *
  43  *  * Redistributions of source code must retain the above copyright
  44  *    notice, this list of conditions and the following disclaimer.
  45  *  * Redistributions in binary form must reproduce the above copyright
  46  *    notice, this list of conditions and the following disclaimer in
  47  *    the documentation and/or other materials provided with the
  48  *    distribution.
  49  *  * Neither the name Intel Corporation nor the names of its
  50  *    contributors may be used to endorse or promote products derived
  51  *    from this software without specific prior written permission.
  52  *
  53  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  54  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  55  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  56  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  57  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  58  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  59  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  60  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  61  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  62  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  63  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  64  *****************************************************************************/
  65 #include <asm/unaligned.h>
  66 #include <linux/etherdevice.h>
  67 #include <linux/skbuff.h>
  68 #include "iwl-trans.h"
  69 #include "mvm.h"
  70 #include "fw-api.h"
  71
  72 /*
  73  * iwl_mvm_rx_rx_phy_cmd - REPLY_RX_PHY_CMD handler
  74  *
  75  * Copies the phy information in mvm->last_phy_info, it will be used when the
  76  * actual data will come from the fw in the next packet.
  77  */
  78 void iwl_mvm_rx_rx_phy_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
  79 {
  80         struct iwl_rx_packet *pkt = rxb_addr(rxb);
  81
  82         memcpy(&mvm->last_phy_info, pkt->data, sizeof(mvm->last_phy_info));
  83         mvm->ampdu_ref++;
  84
  85 #ifdef CONFIG_IWLWIFI_DEBUGFS
  86         if (mvm->last_phy_info.phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
  87                 spin_lock(&mvm->drv_stats_lock);
  88                 mvm->drv_rx_stats.ampdu_count++;
  89                 spin_unlock(&mvm->drv_stats_lock);
  90         }
  91 #endif
  92 }
  93
  94 /*
  95  * iwl_mvm_pass_packet_to_mac80211 - builds the packet for mac80211
  96  *
  97  * Adds the rxb to a new skb and give it to mac80211
  98  */
  99 static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm,
 100                                             struct ieee80211_sta *sta,
 101                                             struct napi_struct *napi,
 102                                             struct sk_buff *skb,
 103                                             struct ieee80211_hdr *hdr, u16 len,
 104                                             u8 crypt_len,
 105                                             struct iwl_rx_cmd_buffer *rxb)
 106 {
 107         unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
 108         unsigned int fraglen;
 109
 110         /*
 111          * The 'hdrlen' (plus the 8 bytes for the SNAP and the crypt_len,
 112          * but those are all multiples of 4 long) all goes away, but we
 113          * want the *end* of it, which is going to be the start of the IP
 114          * header, to be aligned when it gets pulled in.
 115          * The beginning of the skb->data is aligned on at least a 4-byte
 116          * boundary after allocation. Everything here is aligned at least
 117          * on a 2-byte boundary so we can just take hdrlen & 3 and pad by
 118          * the result.
 119          */
 120         skb_reserve(skb, hdrlen & 3);
 121
 122         /* If frame is small enough to fit in skb->head, pull it completely.
 123          * If not, only pull ieee80211_hdr (including crypto if present, and
 124          * an additional 8 bytes for SNAP/ethertype, see below) so that
 125          * splice() or TCP coalesce are more efficient.
 126          *
 127          * Since, in addition, ieee80211_data_to_8023() always pull in at
 128          * least 8 bytes (possibly more for mesh) we can do the same here
 129          * to save the cost of doing it later. That still doesn't pull in
 130          * the actual IP header since the typical case has a SNAP header.
 131          * If the latter changes (there are efforts in the standards group
 132          * to do so) we should revisit this and ieee80211_data_to_8023().
 133          */
 134         hdrlen = (len <= skb_tailroom(skb)) ? len : hdrlen + crypt_len + 8;
 135
 136         skb_put_data(skb, hdr, hdrlen);
 137         fraglen = len - hdrlen;
 138
 139         if (fraglen) {
 140                 int offset = (void *)hdr + hdrlen -
 141                              rxb_addr(rxb) + rxb_offset(rxb);
 142
 143                 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
 144                                 fraglen, rxb->truesize);
 145         }
 146
 147         ieee80211_rx_napi(mvm->hw, sta, skb, napi);
 148 }
 149
 150 /*
 151  * iwl_mvm_get_signal_strength - use new rx PHY INFO API
 152  * values are reported by the fw as positive values - need to negate
 153  * to obtain their dBM.  Account for missing antennas by replacing 0
 154  * values by -256dBm: practically 0 power and a non-feasible 8 bit value.
 155  */
 156 static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm,
 157                                         struct iwl_rx_phy_info *phy_info,
 158                                         struct ieee80211_rx_status *rx_status)
 159 {
 160         int energy_a, energy_b, energy_c, max_energy;
 161         u32 val;
 162
 163         val =
 164             le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_ENERGY_ANT_ABC_IDX]);
 165         energy_a = (val & IWL_RX_INFO_ENERGY_ANT_A_MSK) >>
 166                                                 IWL_RX_INFO_ENERGY_ANT_A_POS;
 167         energy_a = energy_a ? -energy_a : S8_MIN;
 168         energy_b = (val & IWL_RX_INFO_ENERGY_ANT_B_MSK) >>
 169                                                 IWL_RX_INFO_ENERGY_ANT_B_POS;
 170         energy_b = energy_b ? -energy_b : S8_MIN;
 171         energy_c = (val & IWL_RX_INFO_ENERGY_ANT_C_MSK) >>
 172                                                 IWL_RX_INFO_ENERGY_ANT_C_POS;
 173         energy_c = energy_c ? -energy_c : S8_MIN;
 174         max_energy = max(energy_a, energy_b);
 175         max_energy = max(max_energy, energy_c);
 176
 177         IWL_DEBUG_STATS(mvm, "energy In A %d B %d C %d , and max %d\n",
 178                         energy_a, energy_b, energy_c, max_energy);
 179
 180         rx_status->signal = max_energy;
 181         rx_status->chains = (le16_to_cpu(phy_info->phy_flags) &
 182                                 RX_RES_PHY_FLAGS_ANTENNA)
 183                                         >> RX_RES_PHY_FLAGS_ANTENNA_POS;
 184         rx_status->chain_signal[0] = energy_a;
 185         rx_status->chain_signal[1] = energy_b;
 186         rx_status->chain_signal[2] = energy_c;
 187 }
 188
 189 /*
 190  * iwl_mvm_set_mac80211_rx_flag - translate fw status to mac80211 format
 191  * @mvm: the mvm object
 192  * @hdr: 80211 header
 193  * @stats: status in mac80211's format
 194  * @rx_pkt_status: status coming from fw
 195  *
 196  * returns non 0 value if the packet should be dropped
 197  */
 198 static u32 iwl_mvm_set_mac80211_rx_flag(struct iwl_mvm *mvm,
 199                                         struct ieee80211_hdr *hdr,
 200                                         struct ieee80211_rx_status *stats,
 201                                         u32 rx_pkt_status,
 202                                         u8 *crypt_len)
 203 {
 204         if (!ieee80211_has_protected(hdr->frame_control) ||
 205             (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 206                              RX_MPDU_RES_STATUS_SEC_NO_ENC)
 207                 return 0;
 208
 209         /* packet was encrypted with unknown alg */
 210         if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 211                                         RX_MPDU_RES_STATUS_SEC_ENC_ERR)
 212                 return 0;
 213
 214         switch (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) {
 215         case RX_MPDU_RES_STATUS_SEC_CCM_ENC:
 216                 /* alg is CCM: check MIC only */
 217                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
 218                         return -1;
 219
 220                 stats->flag |= RX_FLAG_DECRYPTED;
 221                 *crypt_len = IEEE80211_CCMP_HDR_LEN;
 222                 return 0;
 223
 224         case RX_MPDU_RES_STATUS_SEC_TKIP_ENC:
 225                 /* Don't drop the frame and decrypt it in SW */
 226                 if (!fw_has_api(&mvm->fw->ucode_capa,
 227                                 IWL_UCODE_TLV_API_DEPRECATE_TTAK) &&
 228                     !(rx_pkt_status & RX_MPDU_RES_STATUS_TTAK_OK))
 229                         return 0;
 230                 *crypt_len = IEEE80211_TKIP_IV_LEN;
 231                 /* fall through if TTAK OK */
 232
 233         case RX_MPDU_RES_STATUS_SEC_WEP_ENC:
 234                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_ICV_OK))
 235                         return -1;
 236
 237                 stats->flag |= RX_FLAG_DECRYPTED;
 238                 if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 239                                 RX_MPDU_RES_STATUS_SEC_WEP_ENC)
 240                         *crypt_len = IEEE80211_WEP_IV_LEN;
 241                 return 0;
 242
 243         case RX_MPDU_RES_STATUS_SEC_EXT_ENC:
 244                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
 245                         return -1;
 246                 stats->flag |= RX_FLAG_DECRYPTED;
 247                 return 0;
 248
 249         default:
 250                 /* Expected in monitor (not having the keys) */
 251                 if (!mvm->monitor_on)
 252                         IWL_ERR(mvm, "Unhandled alg: 0x%x\n", rx_pkt_status);
 253         }
 254
 255         return 0;
 256 }
 257
 258 static void iwl_mvm_rx_handle_tcm(struct iwl_mvm *mvm,
 259                                   struct ieee80211_sta *sta,
 260                                   struct ieee80211_hdr *hdr, u32 len,
 261                                   struct iwl_rx_phy_info *phy_info,
 262                                   u32 rate_n_flags)
 263 {
 264         struct iwl_mvm_sta *mvmsta;
 265         struct iwl_mvm_tcm_mac *mdata;
 266         int mac;
 267         int ac = IEEE80211_AC_BE; /* treat non-QoS as BE */
 268         struct iwl_mvm_vif *mvmvif;
 269         /* expected throughput in 100Kbps, single stream, 20 MHz */
 270         static const u8 thresh_tpt[] = {
 271                 9, 18, 30, 42, 60, 78, 90, 96, 120, 135,
 272         };
 273         u16 thr;
 274
 275         if (ieee80211_is_data_qos(hdr->frame_control))
 276                 ac = tid_to_mac80211_ac[ieee80211_get_tid(hdr)];
 277
 278         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 279         mac = mvmsta->mac_id_n_color & FW_CTXT_ID_MSK;
 280
 281         if (time_after(jiffies, mvm->tcm.ts + MVM_TCM_PERIOD))
 282                 schedule_delayed_work(&mvm->tcm.work, 0);
 283         mdata = &mvm->tcm.data[mac];
 284         mdata->rx.pkts[ac]++;
 285
 286         /* count the airtime only once for each ampdu */
 287         if (mdata->rx.last_ampdu_ref != mvm->ampdu_ref) {
 288                 mdata->rx.last_ampdu_ref = mvm->ampdu_ref;
 289                 mdata->rx.airtime += le16_to_cpu(phy_info->frame_time);
 290         }
 291
 292         if (!(rate_n_flags & (RATE_MCS_HT_MSK | RATE_MCS_VHT_MSK)))
 293                 return;
 294
 295         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
 296
 297         if (mdata->opened_rx_ba_sessions ||
 298             mdata->uapsd_nonagg_detect.detected ||
 299             (!mvmvif->queue_params[IEEE80211_AC_VO].uapsd &&
 300              !mvmvif->queue_params[IEEE80211_AC_VI].uapsd &&
 301              !mvmvif->queue_params[IEEE80211_AC_BE].uapsd &&
 302              !mvmvif->queue_params[IEEE80211_AC_BK].uapsd) ||
 303             mvmsta->sta_id != mvmvif->ap_sta_id)
 304                 return;
 305
 306         if (rate_n_flags & RATE_MCS_HT_MSK) {
 307                 thr = thresh_tpt[rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK];
 308                 thr *= 1 + ((rate_n_flags & RATE_HT_MCS_NSS_MSK) >>
 309                                         RATE_HT_MCS_NSS_POS);
 310         } else {
 311                 if (WARN_ON((rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK) >=
 312                                 ARRAY_SIZE(thresh_tpt)))
 313                         return;
 314                 thr = thresh_tpt[rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK];
 315                 thr *= 1 + ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
 316                                         RATE_VHT_MCS_NSS_POS);
 317         }
 318
 319         thr <<= ((rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) >>
 320                                 RATE_MCS_CHAN_WIDTH_POS);
 321
 322         mdata->uapsd_nonagg_detect.rx_bytes += len;
 323         ewma_rate_add(&mdata->uapsd_nonagg_detect.rate, thr);
 324 }
 325
 326 static void iwl_mvm_rx_csum(struct ieee80211_sta *sta,
 327                             struct sk_buff *skb,
 328                             u32 status)
 329 {
 330         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 331         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
 332
 333         if (mvmvif->features & NETIF_F_RXCSUM &&
 334             status & RX_MPDU_RES_STATUS_CSUM_DONE &&
 335             status & RX_MPDU_RES_STATUS_CSUM_OK)
 336                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 337 }
 338
 339 /*
 340  * iwl_mvm_rx_rx_mpdu - REPLY_RX_MPDU_CMD handler
 341  *
 342  * Handles the actual data of the Rx packet from the fw
 343  */
 344 void iwl_mvm_rx_rx_mpdu(struct iwl_mvm *mvm, struct napi_struct *napi,
 345                         struct iwl_rx_cmd_buffer *rxb)
 346 {
 347         struct ieee80211_hdr *hdr;
 348         struct ieee80211_rx_status *rx_status;
 349         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 350         struct iwl_rx_phy_info *phy_info;
 351         struct iwl_rx_mpdu_res_start *rx_res;
 352         struct ieee80211_sta *sta = NULL;
 353         struct sk_buff *skb;
 354         u32 len;
 355         u32 rate_n_flags;
 356         u32 rx_pkt_status;
 357         u8 crypt_len = 0;
 358         bool take_ref;
 359
 360         phy_info = &mvm->last_phy_info;
 361         rx_res = (struct iwl_rx_mpdu_res_start *)pkt->data;
 362         hdr = (struct ieee80211_hdr *)(pkt->data + sizeof(*rx_res));
 363         len = le16_to_cpu(rx_res->byte_count);
 364         rx_pkt_status = get_unaligned_le32((__le32 *)
 365                 (pkt->data + sizeof(*rx_res) + len));
 366
 367         /* Dont use dev_alloc_skb(), we'll have enough headroom once
 368          * ieee80211_hdr pulled.
 369          */
 370         skb = alloc_skb(128, GFP_ATOMIC);
 371         if (!skb) {
 372                 IWL_ERR(mvm, "alloc_skb failed\n");
 373                 return;
 374         }
 375
 376         rx_status = IEEE80211_SKB_RXCB(skb);
 377
 378         /*
 379          * drop the packet if it has failed being decrypted by HW
 380          */
 381         if (iwl_mvm_set_mac80211_rx_flag(mvm, hdr, rx_status, rx_pkt_status,
 382                                          &crypt_len)) {
 383                 IWL_DEBUG_DROP(mvm, "Bad decryption results 0x%08x\n",
 384                                rx_pkt_status);
 385                 kfree_skb(skb);
 386                 return;
 387         }
 388
 389         /*
 390          * Keep packets with CRC errors (and with overrun) for monitor mode
 391          * (otherwise the firmware discards them) but mark them as bad.
 392          */
 393         if (!(rx_pkt_status & RX_MPDU_RES_STATUS_CRC_OK) ||
 394             !(rx_pkt_status & RX_MPDU_RES_STATUS_OVERRUN_OK)) {
 395                 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n", rx_pkt_status);
 396                 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
 397         }
 398
 399         /* This will be used in several places later */
 400         rate_n_flags = le32_to_cpu(phy_info->rate_n_flags);
 401
 402         /* rx_status carries information about the packet to mac80211 */
 403         rx_status->mactime = le64_to_cpu(phy_info->timestamp);
 404         rx_status->device_timestamp = le32_to_cpu(phy_info->system_timestamp);
 405         rx_status->band =
 406                 (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_BAND_24)) ?
 407                                 NL80211_BAND_2GHZ : NL80211_BAND_5GHZ;
 408         rx_status->freq =
 409                 ieee80211_channel_to_frequency(le16_to_cpu(phy_info->channel),
 410                                                rx_status->band);
 411
 412         /* TSF as indicated by the firmware  is at INA time */
 413         rx_status->flag |= RX_FLAG_MACTIME_PLCP_START;
 414
 415         iwl_mvm_get_signal_strength(mvm, phy_info, rx_status);
 416
 417         IWL_DEBUG_STATS_LIMIT(mvm, "Rssi %d, TSF %llu\n", rx_status->signal,
 418                               (unsigned long long)rx_status->mactime);
 419
 420         rcu_read_lock();
 421         if (rx_pkt_status & RX_MPDU_RES_STATUS_SRC_STA_FOUND) {
 422                 u32 id = rx_pkt_status & RX_MPDU_RES_STATUS_STA_ID_MSK;
 423
 424                 id >>= RX_MDPU_RES_STATUS_STA_ID_SHIFT;
 425
 426                 if (!WARN_ON_ONCE(id >= ARRAY_SIZE(mvm->fw_id_to_mac_id))) {
 427                         sta = rcu_dereference(mvm->fw_id_to_mac_id[id]);
 428                         if (IS_ERR(sta))
 429                                 sta = NULL;
 430                 }
 431         } else if (!is_multicast_ether_addr(hdr->addr2)) {
 432                 /* This is fine since we prevent two stations with the same
 433                  * address from being added.
 434                  */
 435                 sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL);
 436         }
 437
 438         if (sta) {
 439                 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 440                 struct ieee80211_vif *tx_blocked_vif =
 441                         rcu_dereference(mvm->csa_tx_blocked_vif);
 442
 443                 /* We have tx blocked stations (with CS bit). If we heard
 444                  * frames from a blocked station on a new channel we can
 445                  * TX to it again.
 446                  */
 447                 if (unlikely(tx_blocked_vif) &&
 448                     mvmsta->vif == tx_blocked_vif) {
 449                         struct iwl_mvm_vif *mvmvif =
 450                                 iwl_mvm_vif_from_mac80211(tx_blocked_vif);
 451
 452                         if (mvmvif->csa_target_freq == rx_status->freq)
 453                                 iwl_mvm_sta_modify_disable_tx_ap(mvm, sta,
 454                                                                  false);
 455                 }
 456
 457                 rs_update_last_rssi(mvm, mvmsta, rx_status);
 458
 459                 if (iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_RSSI) &&
 460                     ieee80211_is_beacon(hdr->frame_control)) {
 461                         struct iwl_fw_dbg_trigger_tlv *trig;
 462                         struct iwl_fw_dbg_trigger_low_rssi *rssi_trig;
 463                         bool trig_check;
 464                         s32 rssi;
 465
 466                         trig = iwl_fw_dbg_get_trigger(mvm->fw,
 467                                                       FW_DBG_TRIGGER_RSSI);
 468                         rssi_trig = (void *)trig->data;
 469                         rssi = le32_to_cpu(rssi_trig->rssi);
 470
 471                         trig_check =
 472                                 iwl_fw_dbg_trigger_check_stop(&mvm->fwrt,
 473                                                               ieee80211_vif_to_wdev(mvmsta->vif),
 474                                                               trig);
 475                         if (trig_check && rx_status->signal < rssi)
 476                                 iwl_fw_dbg_collect_trig(&mvm->fwrt, trig,
 477                                                         NULL);
 478                 }
 479
 480                 if (!mvm->tcm.paused && len >= sizeof(*hdr) &&
 481                     !is_multicast_ether_addr(hdr->addr1) &&
 482                     ieee80211_is_data(hdr->frame_control))
 483                         iwl_mvm_rx_handle_tcm(mvm, sta, hdr, len, phy_info,
 484                                               rate_n_flags);
 485
 486                 if (ieee80211_is_data(hdr->frame_control))
 487                         iwl_mvm_rx_csum(sta, skb, rx_pkt_status);
 488         }
 489         rcu_read_unlock();
 490
 491         /* set the preamble flag if appropriate */
 492         if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_SHORT_PREAMBLE))
 493                 rx_status->enc_flags |= RX_ENC_FLAG_SHORTPRE;
 494
 495         if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
 496                 /*
 497                  * We know which subframes of an A-MPDU belong
 498                  * together since we get a single PHY response
 499                  * from the firmware for all of them
 500                  */
 501                 rx_status->flag |= RX_FLAG_AMPDU_DETAILS;
 502                 rx_status->ampdu_reference = mvm->ampdu_ref;
 503         }
 504
 505         /* Set up the HT phy flags */
 506         switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
 507         case RATE_MCS_CHAN_WIDTH_20:
 508                 break;
 509         case RATE_MCS_CHAN_WIDTH_40:
 510                 rx_status->bw = RATE_INFO_BW_40;
 511                 break;
 512         case RATE_MCS_CHAN_WIDTH_80:
 513                 rx_status->bw = RATE_INFO_BW_80;
 514                 break;
 515         case RATE_MCS_CHAN_WIDTH_160:
 516                 rx_status->bw = RATE_INFO_BW_160;
 517                 break;
 518         }
 519         if (!(rate_n_flags & RATE_MCS_CCK_MSK) &&
 520             rate_n_flags & RATE_MCS_SGI_MSK)
 521                 rx_status->enc_flags |= RX_ENC_FLAG_SHORT_GI;
 522         if (rate_n_flags & RATE_HT_MCS_GF_MSK)
 523                 rx_status->enc_flags |= RX_ENC_FLAG_HT_GF;
 524         if (rate_n_flags & RATE_MCS_LDPC_MSK)
 525                 rx_status->enc_flags |= RX_ENC_FLAG_LDPC;
 526         if (rate_n_flags & RATE_MCS_HT_MSK) {
 527                 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >>
 528                                 RATE_MCS_STBC_POS;
 529                 rx_status->encoding = RX_ENC_HT;
 530                 rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
 531                 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT;
 532         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 533                 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >>
 534                                 RATE_MCS_STBC_POS;
 535                 rx_status->nss =
 536                         ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
 537                                                 RATE_VHT_MCS_NSS_POS) + 1;
 538                 rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 539                 rx_status->encoding = RX_ENC_VHT;
 540                 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT;
 541                 if (rate_n_flags & RATE_MCS_BF_MSK)
 542                         rx_status->enc_flags |= RX_ENC_FLAG_BF;
 543         } else {
 544                 int rate = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
 545                                                                rx_status->band);
 546
 547                 if (WARN(rate < 0 || rate > 0xFF,
 548                          "Invalid rate flags 0x%x, band %d,\n",
 549                          rate_n_flags, rx_status->band)) {
 550                         kfree_skb(skb);
 551                         return;
 552                 }
 553                 rx_status->rate_idx = rate;
 554         }
 555
 556 #ifdef CONFIG_IWLWIFI_DEBUGFS
 557         iwl_mvm_update_frame_stats(mvm, rate_n_flags,
 558                                    rx_status->flag & RX_FLAG_AMPDU_DETAILS);
 559 #endif
 560
 561         if (unlikely((ieee80211_is_beacon(hdr->frame_control) ||
 562                       ieee80211_is_probe_resp(hdr->frame_control)) &&
 563                      mvm->sched_scan_pass_all == SCHED_SCAN_PASS_ALL_ENABLED))
 564                 mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_FOUND;
 565
 566         if (unlikely(ieee80211_is_beacon(hdr->frame_control) ||
 567                      ieee80211_is_probe_resp(hdr->frame_control)))
 568                 rx_status->boottime_ns = ktime_get_boot_ns();
 569
 570         /* Take a reference briefly to kick off a d0i3 entry delay so
 571          * we can handle bursts of RX packets without toggling the
 572          * state too often.  But don't do this for beacons if we are
 573          * going to idle because the beacon filtering changes we make
 574          * cause the firmware to send us collateral beacons. */
 575         take_ref = !(test_bit(STATUS_TRANS_GOING_IDLE, &mvm->trans->status) &&
 576                      ieee80211_is_beacon(hdr->frame_control));
 577
 578         if (take_ref)
 579                 iwl_mvm_ref(mvm, IWL_MVM_REF_RX);
 580
 581         iwl_mvm_pass_packet_to_mac80211(mvm, sta, napi, skb, hdr, len,
 582                                         crypt_len, rxb);
 583
 584         if (take_ref)
 585                 iwl_mvm_unref(mvm, IWL_MVM_REF_RX);
 586 }
 587
 588 struct iwl_mvm_stat_data {
 589         struct iwl_mvm *mvm;
 590         __le32 flags;
 591         __le32 mac_id;
 592         u8 beacon_filter_average_energy;
 593         void *general;
 594 };
 595
 596 static void iwl_mvm_stat_iterator(void *_data, u8 *mac,
 597                                   struct ieee80211_vif *vif)
 598 {
 599         struct iwl_mvm_stat_data *data = _data;
 600         struct iwl_mvm *mvm = data->mvm;
 601         int sig = -data->beacon_filter_average_energy;
 602         int last_event;
 603         int thold = vif->bss_conf.cqm_rssi_thold;
 604         int hyst = vif->bss_conf.cqm_rssi_hyst;
 605         u16 id = le32_to_cpu(data->mac_id);
 606         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 607
 608         /* This doesn't need the MAC ID check since it's not taking the
 609          * data copied into the "data" struct, but rather the data from
 610          * the notification directly.
 611          */
 612         if (data->general) {
 613                 u16 vif_id = mvmvif->id;
 614
 615                 if (iwl_mvm_is_cdb_supported(mvm)) {
 616                         struct mvm_statistics_general_cdb *general =
 617                                 data->general;
 618
 619                         mvmvif->beacon_stats.num_beacons =
 620                                 le32_to_cpu(general->beacon_counter[vif_id]);
 621                         mvmvif->beacon_stats.avg_signal =
 622                                 -general->beacon_average_energy[vif_id];
 623                 } else {
 624                         struct mvm_statistics_general_v8 *general =
 625                                 data->general;
 626
 627                         mvmvif->beacon_stats.num_beacons =
 628                                 le32_to_cpu(general->beacon_counter[vif_id]);
 629                         mvmvif->beacon_stats.avg_signal =
 630                                 -general->beacon_average_energy[vif_id];
 631                 }
 632         }
 633
 634         /* make sure that beacon statistics don't go backwards with TCM
 635          * request to clear statistics
 636          */
 637         if (le32_to_cpu(data->flags) & IWL_STATISTICS_REPLY_FLG_CLEAR)
 638                 mvmvif->beacon_stats.accu_num_beacons +=
 639                         mvmvif->beacon_stats.num_beacons;
 640
 641         if (mvmvif->id != id)
 642                 return;
 643
 644         if (vif->type != NL80211_IFTYPE_STATION)
 645                 return;
 646
 647         if (sig == 0) {
 648                 IWL_DEBUG_RX(mvm, "RSSI is 0 - skip signal based decision\n");
 649                 return;
 650         }
 651
 652         mvmvif->bf_data.ave_beacon_signal = sig;
 653
 654         /* BT Coex */
 655         if (mvmvif->bf_data.bt_coex_min_thold !=
 656             mvmvif->bf_data.bt_coex_max_thold) {
 657                 last_event = mvmvif->bf_data.last_bt_coex_event;
 658                 if (sig > mvmvif->bf_data.bt_coex_max_thold &&
 659                     (last_event <= mvmvif->bf_data.bt_coex_min_thold ||
 660                      last_event == 0)) {
 661                         mvmvif->bf_data.last_bt_coex_event = sig;
 662                         IWL_DEBUG_RX(mvm, "cqm_iterator bt coex high %d\n",
 663                                      sig);
 664                         iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_HIGH);
 665                 } else if (sig < mvmvif->bf_data.bt_coex_min_thold &&
 666                            (last_event >= mvmvif->bf_data.bt_coex_max_thold ||
 667                             last_event == 0)) {
 668                         mvmvif->bf_data.last_bt_coex_event = sig;
 669                         IWL_DEBUG_RX(mvm, "cqm_iterator bt coex low %d\n",
 670                                      sig);
 671                         iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_LOW);
 672                 }
 673         }
 674
 675         if (!(vif->driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI))
 676                 return;
 677
 678         /* CQM Notification */
 679         last_event = mvmvif->bf_data.last_cqm_event;
 680         if (thold && sig < thold && (last_event == 0 ||
 681                                      sig < last_event - hyst)) {
 682                 mvmvif->bf_data.last_cqm_event = sig;
 683                 IWL_DEBUG_RX(mvm, "cqm_iterator cqm low %d\n",
 684                              sig);
 685                 ieee80211_cqm_rssi_notify(
 686                         vif,
 687                         NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
 688                         sig,
 689                         GFP_KERNEL);
 690         } else if (sig > thold &&
 691                    (last_event == 0 || sig > last_event + hyst)) {
 692                 mvmvif->bf_data.last_cqm_event = sig;
 693                 IWL_DEBUG_RX(mvm, "cqm_iterator cqm high %d\n",
 694                              sig);
 695                 ieee80211_cqm_rssi_notify(
 696                         vif,
 697                         NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
 698                         sig,
 699                         GFP_KERNEL);
 700         }
 701 }
 702
 703 static inline void
 704 iwl_mvm_rx_stats_check_trigger(struct iwl_mvm *mvm, struct iwl_rx_packet *pkt)
 705 {
 706         struct iwl_fw_dbg_trigger_tlv *trig;
 707         struct iwl_fw_dbg_trigger_stats *trig_stats;
 708         u32 trig_offset, trig_thold;
 709
 710         if (!iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_STATS))
 711                 return;
 712
 713         trig = iwl_fw_dbg_get_trigger(mvm->fw, FW_DBG_TRIGGER_STATS);
 714         trig_stats = (void *)trig->data;
 715
 716         if (!iwl_fw_dbg_trigger_check_stop(&mvm->fwrt, NULL, trig))
 717                 return;
 718
 719         trig_offset = le32_to_cpu(trig_stats->stop_offset);
 720         trig_thold = le32_to_cpu(trig_stats->stop_threshold);
 721
 722         if (WARN_ON_ONCE(trig_offset >= iwl_rx_packet_payload_len(pkt)))
 723                 return;
 724
 725         if (le32_to_cpup((__le32 *) (pkt->data + trig_offset)) < trig_thold)
 726                 return;
 727
 728         iwl_fw_dbg_collect_trig(&mvm->fwrt, trig, NULL);
 729 }
 730
 731 void iwl_mvm_handle_rx_statistics(struct iwl_mvm *mvm,
 732                                   struct iwl_rx_packet *pkt)
 733 {
 734         struct iwl_mvm_stat_data data = {
 735                 .mvm = mvm,
 736         };
 737         int expected_size;
 738         int i;
 739         u8 *energy;
 740         __le32 *bytes;
 741         __le32 *air_time;
 742         __le32 flags;
 743
 744         if (!iwl_mvm_has_new_rx_stats_api(mvm)) {
 745                 if (iwl_mvm_has_new_rx_api(mvm))
 746                         expected_size = sizeof(struct iwl_notif_statistics_v11);
 747                 else
 748                         expected_size = sizeof(struct iwl_notif_statistics_v10);
 749         } else {
 750                 expected_size = sizeof(struct iwl_notif_statistics_cdb);
 751         }
 752
 753         if (WARN_ONCE(iwl_rx_packet_payload_len(pkt) != expected_size,
 754                       "received invalid statistics size (%d)!\n",
 755                       iwl_rx_packet_payload_len(pkt)))
 756                 return;
 757
 758         if (!iwl_mvm_has_new_rx_stats_api(mvm)) {
 759                 struct iwl_notif_statistics_v11 *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_v3 = 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         } else {
 780                 struct iwl_notif_statistics_cdb *stats = (void *)&pkt->data;
 781
 782                 data.mac_id = stats->rx.general.mac_id;
 783                 data.beacon_filter_average_energy =
 784                         stats->general.common.beacon_filter_average_energy;
 785
 786                 mvm->rx_stats = stats->rx;
 787
 788                 mvm->radio_stats.rx_time =
 789                         le64_to_cpu(stats->general.common.rx_time);
 790                 mvm->radio_stats.tx_time =
 791                         le64_to_cpu(stats->general.common.tx_time);
 792                 mvm->radio_stats.on_time_rf =
 793                         le64_to_cpu(stats->general.common.on_time_rf);
 794                 mvm->radio_stats.on_time_scan =
 795                         le64_to_cpu(stats->general.common.on_time_scan);
 796
 797                 data.general = &stats->general;
 798
 799                 flags = stats->flag;
 800         }
 801         data.flags = flags;
 802
 803         iwl_mvm_rx_stats_check_trigger(mvm, pkt);
 804
 805         ieee80211_iterate_active_interfaces(mvm->hw,
 806                                             IEEE80211_IFACE_ITER_NORMAL,
 807                                             iwl_mvm_stat_iterator,
 808                                             &data);
 809
 810         if (!iwl_mvm_has_new_rx_api(mvm))
 811                 return;
 812
 813         if (!iwl_mvm_has_new_rx_stats_api(mvm)) {
 814                 struct iwl_notif_statistics_v11 *v11 = (void *)&pkt->data;
 815
 816                 energy = (void *)&v11->load_stats.avg_energy;
 817                 bytes = (void *)&v11->load_stats.byte_count;
 818                 air_time = (void *)&v11->load_stats.air_time;
 819         } else {
 820                 struct iwl_notif_statistics_cdb *stats = (void *)&pkt->data;
 821
 822                 energy = (void *)&stats->load_stats.avg_energy;
 823                 bytes = (void *)&stats->load_stats.byte_count;
 824                 air_time = (void *)&stats->load_stats.air_time;
 825         }
 826
 827         rcu_read_lock();
 828         for (i = 0; i < ARRAY_SIZE(mvm->fw_id_to_mac_id); i++) {
 829                 struct iwl_mvm_sta *sta;
 830
 831                 if (!energy[i])
 832                         continue;
 833
 834                 sta = iwl_mvm_sta_from_staid_rcu(mvm, i);
 835                 if (!sta)
 836                         continue;
 837                 sta->avg_energy = energy[i];
 838         }
 839         rcu_read_unlock();
 840
 841         /*
 842          * Don't update in case the statistics are not cleared, since
 843          * we will end up counting twice the same airtime, once in TCM
 844          * request and once in statistics notification.
 845          */
 846         if (!(le32_to_cpu(flags) & IWL_STATISTICS_REPLY_FLG_CLEAR))
 847                 return;
 848
 849         spin_lock(&mvm->tcm.lock);
 850         for (i = 0; i < NUM_MAC_INDEX_DRIVER; i++) {
 851                 struct iwl_mvm_tcm_mac *mdata = &mvm->tcm.data[i];
 852                 u32 airtime = le32_to_cpu(air_time[i]);
 853                 u32 rx_bytes = le32_to_cpu(bytes[i]);
 854
 855                 mdata->uapsd_nonagg_detect.rx_bytes += rx_bytes;
 856                 if (airtime) {
 857                         /* re-init every time to store rate from FW */
 858                         ewma_rate_init(&mdata->uapsd_nonagg_detect.rate);
 859                         ewma_rate_add(&mdata->uapsd_nonagg_detect.rate,
 860                                       rx_bytes * 8 / airtime);
 861                 }
 862
 863                 mdata->rx.airtime += airtime;
 864         }
 865         spin_unlock(&mvm->tcm.lock);
 866 }
 867
 868 void iwl_mvm_rx_statistics(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
 869 {
 870         iwl_mvm_handle_rx_statistics(mvm, rxb_addr(rxb));
 871 }
 872
 873 void iwl_mvm_window_status_notif(struct iwl_mvm *mvm,
 874                                  struct iwl_rx_cmd_buffer *rxb)
 875 {
 876         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 877         struct iwl_ba_window_status_notif *notif = (void *)pkt->data;
 878         int i;
 879         u32 pkt_len = iwl_rx_packet_payload_len(pkt);
 880
 881         if (WARN_ONCE(pkt_len != sizeof(*notif),
 882                       "Received window status notification of wrong size (%u)\n",
 883                       pkt_len))
 884                 return;
 885
 886         rcu_read_lock();
 887         for (i = 0; i < BA_WINDOW_STREAMS_MAX; i++) {
 888                 struct ieee80211_sta *sta;
 889                 u8 sta_id, tid;
 890                 u64 bitmap;
 891                 u32 ssn;
 892                 u16 ratid;
 893                 u16 received_mpdu;
 894
 895                 ratid = le16_to_cpu(notif->ra_tid[i]);
 896                 /* check that this TID is valid */
 897                 if (!(ratid & BA_WINDOW_STATUS_VALID_MSK))
 898                         continue;
 899
 900                 received_mpdu = le16_to_cpu(notif->mpdu_rx_count[i]);
 901                 if (received_mpdu == 0)
 902                         continue;
 903
 904                 tid = ratid & BA_WINDOW_STATUS_TID_MSK;
 905                 /* get the station */
 906                 sta_id = (ratid & BA_WINDOW_STATUS_STA_ID_MSK)
 907                          >> BA_WINDOW_STATUS_STA_ID_POS;
 908                 sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
 909                 if (IS_ERR_OR_NULL(sta))
 910                         continue;
 911                 bitmap = le64_to_cpu(notif->bitmap[i]);
 912                 ssn = le32_to_cpu(notif->start_seq_num[i]);
 913
 914                 /* update mac80211 with the bitmap for the reordering buffer */
 915                 ieee80211_mark_rx_ba_filtered_frames(sta, tid, ssn, bitmap,
 916                                                      received_mpdu);
 917         }
 918         rcu_read_unlock();
 919 }