drivers/net/wireless/intel/iwlwifi/mvm/rx.c

   1 /******************************************************************************
   2  *
   3  * This file is provided under a dual BSD/GPLv2 license.  When using or
   4  * redistributing this file, you may do so under either license.
   5  *
   6  * GPL LICENSE SUMMARY
   7  *
   8  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
   9  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
  10  * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of version 2 of the GNU General Public License as
  14  * published by the Free Software Foundation.
  15  *
  16  * This program is distributed in the hope that it will be useful, but
  17  * WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  * General Public License for more details.
  20  *
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  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  24  * USA
  25  *
  26  * The full GNU General Public License is included in this distribution
  27  * in the file called COPYING.
  28  *
  29  * Contact Information:
  30  *  Intel Linux Wireless <linuxwifi@intel.com>
  31  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  32  *
  33  * BSD LICENSE
  34  *
  35  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  36  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
  37  * All rights reserved.
  38  *
  39  * Redistribution and use in source and binary forms, with or without
  40  * modification, are permitted provided that the following conditions
  41  * are met:
  42  *
  43  *  * Redistributions of source code must retain the above copyright
  44  *    notice, this list of conditions and the following disclaimer.
  45  *  * Redistributions in binary form must reproduce the above copyright
  46  *    notice, this list of conditions and the following disclaimer in
  47  *    the documentation and/or other materials provided with the
  48  *    distribution.
  49  *  * Neither the name Intel Corporation nor the names of its
  50  *    contributors may be used to endorse or promote products derived
  51  *    from this software without specific prior written permission.
  52  *
  53  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  54  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  55  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  56  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  57  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  58  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  59  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  60  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  61  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  62  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  63  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  64  *****************************************************************************/
  65 #include <linux/etherdevice.h>
  66 #include <linux/skbuff.h>
  67 #include "iwl-trans.h"
  68 #include "mvm.h"
  69 #include "fw-api.h"
  70
  71 /*
  72  * iwl_mvm_rx_rx_phy_cmd - REPLY_RX_PHY_CMD handler
  73  *
  74  * Copies the phy information in mvm->last_phy_info, it will be used when the
  75  * actual data will come from the fw in the next packet.
  76  */
  77 void iwl_mvm_rx_rx_phy_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
  78 {
  79         struct iwl_rx_packet *pkt = rxb_addr(rxb);
  80
  81         memcpy(&mvm->last_phy_info, pkt->data, sizeof(mvm->last_phy_info));
  82         mvm->ampdu_ref++;
  83
  84 #ifdef CONFIG_IWLWIFI_DEBUGFS
  85         if (mvm->last_phy_info.phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
  86                 spin_lock(&mvm->drv_stats_lock);
  87                 mvm->drv_rx_stats.ampdu_count++;
  88                 spin_unlock(&mvm->drv_stats_lock);
  89         }
  90 #endif
  91 }
  92
  93 /*
  94  * iwl_mvm_pass_packet_to_mac80211 - builds the packet for mac80211
  95  *
  96  * Adds the rxb to a new skb and give it to mac80211
  97  */
  98 static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm,
  99                                             struct ieee80211_sta *sta,
 100                                             struct napi_struct *napi,
 101                                             struct sk_buff *skb,
 102                                             struct ieee80211_hdr *hdr, u16 len,
 103                                             u8 crypt_len,
 104                                             struct iwl_rx_cmd_buffer *rxb)
 105 {
 106         unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
 107         unsigned int fraglen;
 108
 109         /*
 110          * The 'hdrlen' (plus the 8 bytes for the SNAP and the crypt_len,
 111          * but those are all multiples of 4 long) all goes away, but we
 112          * want the *end* of it, which is going to be the start of the IP
 113          * header, to be aligned when it gets pulled in.
 114          * The beginning of the skb->data is aligned on at least a 4-byte
 115          * boundary after allocation. Everything here is aligned at least
 116          * on a 2-byte boundary so we can just take hdrlen & 3 and pad by
 117          * the result.
 118          */
 119         skb_reserve(skb, hdrlen & 3);
 120
 121         /* If frame is small enough to fit in skb->head, pull it completely.
 122          * If not, only pull ieee80211_hdr (including crypto if present, and
 123          * an additional 8 bytes for SNAP/ethertype, see below) so that
 124          * splice() or TCP coalesce are more efficient.
 125          *
 126          * Since, in addition, ieee80211_data_to_8023() always pull in at
 127          * least 8 bytes (possibly more for mesh) we can do the same here
 128          * to save the cost of doing it later. That still doesn't pull in
 129          * the actual IP header since the typical case has a SNAP header.
 130          * If the latter changes (there are efforts in the standards group
 131          * to do so) we should revisit this and ieee80211_data_to_8023().
 132          */
 133         hdrlen = (len <= skb_tailroom(skb)) ? len : hdrlen + crypt_len + 8;
 134
 135         skb_put_data(skb, hdr, hdrlen);
 136         fraglen = len - hdrlen;
 137
 138         if (fraglen) {
 139                 int offset = (void *)hdr + hdrlen -
 140                              rxb_addr(rxb) + rxb_offset(rxb);
 141
 142                 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
 143                                 fraglen, rxb->truesize);
 144         }
 145
 146         ieee80211_rx_napi(mvm->hw, sta, skb, napi);
 147 }
 148
 149 /*
 150  * iwl_mvm_get_signal_strength - use new rx PHY INFO API
 151  * values are reported by the fw as positive values - need to negate
 152  * to obtain their dBM.  Account for missing antennas by replacing 0
 153  * values by -256dBm: practically 0 power and a non-feasible 8 bit value.
 154  */
 155 static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm,
 156                                         struct iwl_rx_phy_info *phy_info,
 157                                         struct ieee80211_rx_status *rx_status)
 158 {
 159         int energy_a, energy_b, energy_c, max_energy;
 160         u32 val;
 161
 162         val =
 163             le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_ENERGY_ANT_ABC_IDX]);
 164         energy_a = (val & IWL_RX_INFO_ENERGY_ANT_A_MSK) >>
 165                                                 IWL_RX_INFO_ENERGY_ANT_A_POS;
 166         energy_a = energy_a ? -energy_a : S8_MIN;
 167         energy_b = (val & IWL_RX_INFO_ENERGY_ANT_B_MSK) >>
 168                                                 IWL_RX_INFO_ENERGY_ANT_B_POS;
 169         energy_b = energy_b ? -energy_b : S8_MIN;
 170         energy_c = (val & IWL_RX_INFO_ENERGY_ANT_C_MSK) >>
 171                                                 IWL_RX_INFO_ENERGY_ANT_C_POS;
 172         energy_c = energy_c ? -energy_c : S8_MIN;
 173         max_energy = max(energy_a, energy_b);
 174         max_energy = max(max_energy, energy_c);
 175
 176         IWL_DEBUG_STATS(mvm, "energy In A %d B %d C %d , and max %d\n",
 177                         energy_a, energy_b, energy_c, max_energy);
 178
 179         rx_status->signal = max_energy;
 180         rx_status->chains = (le16_to_cpu(phy_info->phy_flags) &
 181                                 RX_RES_PHY_FLAGS_ANTENNA)
 182                                         >> RX_RES_PHY_FLAGS_ANTENNA_POS;
 183         rx_status->chain_signal[0] = energy_a;
 184         rx_status->chain_signal[1] = energy_b;
 185         rx_status->chain_signal[2] = energy_c;
 186 }
 187
 188 /*
 189  * iwl_mvm_set_mac80211_rx_flag - translate fw status to mac80211 format
 190  * @mvm: the mvm object
 191  * @hdr: 80211 header
 192  * @stats: status in mac80211's format
 193  * @rx_pkt_status: status coming from fw
 194  *
 195  * returns non 0 value if the packet should be dropped
 196  */
 197 static u32 iwl_mvm_set_mac80211_rx_flag(struct iwl_mvm *mvm,
 198                                         struct ieee80211_hdr *hdr,
 199                                         struct ieee80211_rx_status *stats,
 200                                         u32 rx_pkt_status,
 201                                         u8 *crypt_len)
 202 {
 203         if (!ieee80211_has_protected(hdr->frame_control) ||
 204             (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 205                              RX_MPDU_RES_STATUS_SEC_NO_ENC)
 206                 return 0;
 207
 208         /* packet was encrypted with unknown alg */
 209         if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 210                                         RX_MPDU_RES_STATUS_SEC_ENC_ERR)
 211                 return 0;
 212
 213         switch (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) {
 214         case RX_MPDU_RES_STATUS_SEC_CCM_ENC:
 215                 /* alg is CCM: check MIC only */
 216                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
 217                         return -1;
 218
 219                 stats->flag |= RX_FLAG_DECRYPTED;
 220                 *crypt_len = IEEE80211_CCMP_HDR_LEN;
 221                 return 0;
 222
 223         case RX_MPDU_RES_STATUS_SEC_TKIP_ENC:
 224                 /* Don't drop the frame and decrypt it in SW */
 225                 if (!fw_has_api(&mvm->fw->ucode_capa,
 226                                 IWL_UCODE_TLV_API_DEPRECATE_TTAK) &&
 227                     !(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                 /* Expected in monitor (not having the keys) */
 250                 if (!mvm->monitor_on)
 251                         IWL_ERR(mvm, "Unhandled alg: 0x%x\n", rx_pkt_status);
 252         }
 253
 254         return 0;
 255 }
 256
 257 static void iwl_mvm_rx_handle_tcm(struct iwl_mvm *mvm,
 258                                   struct ieee80211_sta *sta,
 259                                   struct ieee80211_hdr *hdr, u32 len,
 260                                   struct iwl_rx_phy_info *phy_info,
 261                                   u32 rate_n_flags)
 262 {
 263         struct iwl_mvm_sta *mvmsta;
 264         struct iwl_mvm_tcm_mac *mdata;
 265         int mac;
 266         int ac = IEEE80211_AC_BE; /* treat non-QoS as BE */
 267         struct iwl_mvm_vif *mvmvif;
 268         /* expected throughput in 100Kbps, single stream, 20 MHz */
 269         static const u8 thresh_tpt[] = {
 270                 9, 18, 30, 42, 60, 78, 90, 96, 120, 135,
 271         };
 272         u16 thr;
 273
 274         if (ieee80211_is_data_qos(hdr->frame_control))
 275                 ac = tid_to_mac80211_ac[ieee80211_get_tid(hdr)];
 276
 277         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 278         mac = mvmsta->mac_id_n_color & FW_CTXT_ID_MSK;
 279
 280         if (time_after(jiffies, mvm->tcm.ts + MVM_TCM_PERIOD))
 281                 schedule_delayed_work(&mvm->tcm.work, 0);
 282         mdata = &mvm->tcm.data[mac];
 283         mdata->rx.pkts[ac]++;
 284
 285         /* count the airtime only once for each ampdu */
 286         if (mdata->rx.last_ampdu_ref != mvm->ampdu_ref) {
 287                 mdata->rx.last_ampdu_ref = mvm->ampdu_ref;
 288                 mdata->rx.airtime += le16_to_cpu(phy_info->frame_time);
 289         }
 290
 291         if (!(rate_n_flags & (RATE_MCS_HT_MSK | RATE_MCS_VHT_MSK)))
 292                 return;
 293
 294         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
 295
 296         if (mdata->opened_rx_ba_sessions ||
 297             mdata->uapsd_nonagg_detect.detected ||
 298             (!mvmvif->queue_params[IEEE80211_AC_VO].uapsd &&
 299              !mvmvif->queue_params[IEEE80211_AC_VI].uapsd &&
 300              !mvmvif->queue_params[IEEE80211_AC_BE].uapsd &&
 301              !mvmvif->queue_params[IEEE80211_AC_BK].uapsd) ||
 302             mvmsta->sta_id != mvmvif->ap_sta_id)
 303                 return;
 304
 305         if (rate_n_flags & RATE_MCS_HT_MSK) {
 306                 thr = thresh_tpt[rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK];
 307                 thr *= 1 + ((rate_n_flags & RATE_HT_MCS_NSS_MSK) >>
 308                                         RATE_HT_MCS_NSS_POS);
 309         } else {
 310                 if (WARN_ON((rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK) >=
 311                                 ARRAY_SIZE(thresh_tpt)))
 312                         return;
 313                 thr = thresh_tpt[rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK];
 314                 thr *= 1 + ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
 315                                         RATE_VHT_MCS_NSS_POS);
 316         }
 317
 318         thr <<= ((rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) >>
 319                                 RATE_MCS_CHAN_WIDTH_POS);
 320
 321         mdata->uapsd_nonagg_detect.rx_bytes += len;
 322         ewma_rate_add(&mdata->uapsd_nonagg_detect.rate, thr);
 323 }
 324
 325 static void iwl_mvm_rx_csum(struct ieee80211_sta *sta,
 326                             struct sk_buff *skb,
 327                             u32 status)
 328 {
 329         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 330         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
 331
 332         if (mvmvif->features & NETIF_F_RXCSUM &&
 333             status & RX_MPDU_RES_STATUS_CSUM_DONE &&
 334             status & RX_MPDU_RES_STATUS_CSUM_OK)
 335                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 336 }
 337
 338 /*
 339  * iwl_mvm_rx_rx_mpdu - REPLY_RX_MPDU_CMD handler
 340  *
 341  * Handles the actual data of the Rx packet from the fw
 342  */
 343 void iwl_mvm_rx_rx_mpdu(struct iwl_mvm *mvm, struct napi_struct *napi,
 344                         struct iwl_rx_cmd_buffer *rxb)
 345 {
 346         struct ieee80211_hdr *hdr;
 347         struct ieee80211_rx_status *rx_status;
 348         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 349         struct iwl_rx_phy_info *phy_info;
 350         struct iwl_rx_mpdu_res_start *rx_res;
 351         struct ieee80211_sta *sta = NULL;
 352         struct sk_buff *skb;
 353         u32 len;
 354         u32 rate_n_flags;
 355         u32 rx_pkt_status;
 356         u8 crypt_len = 0;
 357         bool take_ref;
 358
 359         phy_info = &mvm->last_phy_info;
 360         rx_res = (struct iwl_rx_mpdu_res_start *)pkt->data;
 361         hdr = (struct ieee80211_hdr *)(pkt->data + sizeof(*rx_res));
 362         len = le16_to_cpu(rx_res->byte_count);
 363         rx_pkt_status = le32_to_cpup((__le32 *)
 364                 (pkt->data + sizeof(*rx_res) + len));
 365
 366         /* Dont use dev_alloc_skb(), we'll have enough headroom once
 367          * ieee80211_hdr pulled.
 368          */
 369         skb = alloc_skb(128, GFP_ATOMIC);
 370         if (!skb) {
 371                 IWL_ERR(mvm, "alloc_skb failed\n");
 372                 return;
 373         }
 374
 375         rx_status = IEEE80211_SKB_RXCB(skb);
 376
 377         /*
 378          * drop the packet if it has failed being decrypted by HW
 379          */
 380         if (iwl_mvm_set_mac80211_rx_flag(mvm, hdr, rx_status, rx_pkt_status,
 381                                          &crypt_len)) {
 382                 IWL_DEBUG_DROP(mvm, "Bad decryption results 0x%08x\n",
 383                                rx_pkt_status);
 384                 kfree_skb(skb);
 385                 return;
 386         }
 387
 388         /*
 389          * Keep packets with CRC errors (and with overrun) for monitor mode
 390          * (otherwise the firmware discards them) but mark them as bad.
 391          */
 392         if (!(rx_pkt_status & RX_MPDU_RES_STATUS_CRC_OK) ||
 393             !(rx_pkt_status & RX_MPDU_RES_STATUS_OVERRUN_OK)) {
 394                 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n", rx_pkt_status);
 395                 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
 396         }
 397
 398         /* This will be used in several places later */
 399         rate_n_flags = le32_to_cpu(phy_info->rate_n_flags);
 400
 401         /* rx_status carries information about the packet to mac80211 */
 402         rx_status->mactime = le64_to_cpu(phy_info->timestamp);
 403         rx_status->device_timestamp = le32_to_cpu(phy_info->system_timestamp);
 404         rx_status->band =
 405                 (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_BAND_24)) ?
 406                                 NL80211_BAND_2GHZ : NL80211_BAND_5GHZ;
 407         rx_status->freq =
 408                 ieee80211_channel_to_frequency(le16_to_cpu(phy_info->channel),
 409                                                rx_status->band);
 410
 411         /* TSF as indicated by the firmware  is at INA time */
 412         rx_status->flag |= RX_FLAG_MACTIME_PLCP_START;
 413
 414         iwl_mvm_get_signal_strength(mvm, phy_info, rx_status);
 415
 416         IWL_DEBUG_STATS_LIMIT(mvm, "Rssi %d, TSF %llu\n", rx_status->signal,
 417                               (unsigned long long)rx_status->mactime);
 418
 419         rcu_read_lock();
 420         if (rx_pkt_status & RX_MPDU_RES_STATUS_SRC_STA_FOUND) {
 421                 u32 id = rx_pkt_status & RX_MPDU_RES_STATUS_STA_ID_MSK;
 422
 423                 id >>= RX_MDPU_RES_STATUS_STA_ID_SHIFT;
 424
 425                 if (!WARN_ON_ONCE(id >= ARRAY_SIZE(mvm->fw_id_to_mac_id))) {
 426                         sta = rcu_dereference(mvm->fw_id_to_mac_id[id]);
 427                         if (IS_ERR(sta))
 428                                 sta = NULL;
 429                 }
 430         } else if (!is_multicast_ether_addr(hdr->addr2)) {
 431                 /* This is fine since we prevent two stations with the same
 432                  * address from being added.
 433                  */
 434                 sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL);
 435         }
 436
 437         if (sta) {
 438                 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 439                 struct ieee80211_vif *tx_blocked_vif =
 440                         rcu_dereference(mvm->csa_tx_blocked_vif);
 441
 442                 /* We have tx blocked stations (with CS bit). If we heard
 443                  * frames from a blocked station on a new channel we can
 444                  * TX to it again.
 445                  */
 446                 if (unlikely(tx_blocked_vif) &&
 447                     mvmsta->vif == tx_blocked_vif) {
 448                         struct iwl_mvm_vif *mvmvif =
 449                                 iwl_mvm_vif_from_mac80211(tx_blocked_vif);
 450
 451                         if (mvmvif->csa_target_freq == rx_status->freq)
 452                                 iwl_mvm_sta_modify_disable_tx_ap(mvm, sta,
 453                                                                  false);
 454                 }
 455
 456                 rs_update_last_rssi(mvm, mvmsta, rx_status);
 457
 458                 if (iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_RSSI) &&
 459                     ieee80211_is_beacon(hdr->frame_control)) {
 460                         struct iwl_fw_dbg_trigger_tlv *trig;
 461                         struct iwl_fw_dbg_trigger_low_rssi *rssi_trig;
 462                         bool trig_check;
 463                         s32 rssi;
 464
 465                         trig = iwl_fw_dbg_get_trigger(mvm->fw,
 466                                                       FW_DBG_TRIGGER_RSSI);
 467                         rssi_trig = (void *)trig->data;
 468                         rssi = le32_to_cpu(rssi_trig->rssi);
 469
 470                         trig_check =
 471                                 iwl_fw_dbg_trigger_check_stop(&mvm->fwrt,
 472                                                               ieee80211_vif_to_wdev(mvmsta->vif),
 473                                                               trig);
 474                         if (trig_check && rx_status->signal < rssi)
 475                                 iwl_fw_dbg_collect_trig(&mvm->fwrt, trig,
 476                                                         NULL);
 477                 }
 478
 479                 if (!mvm->tcm.paused && len >= sizeof(*hdr) &&
 480                     !is_multicast_ether_addr(hdr->addr1) &&
 481                     ieee80211_is_data(hdr->frame_control))
 482                         iwl_mvm_rx_handle_tcm(mvm, sta, hdr, len, phy_info,
 483                                               rate_n_flags);
 484
 485                 if (ieee80211_is_data(hdr->frame_control))
 486                         iwl_mvm_rx_csum(sta, skb, rx_pkt_status);
 487         }
 488         rcu_read_unlock();
 489
 490         /* set the preamble flag if appropriate */
 491         if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_SHORT_PREAMBLE))
 492                 rx_status->enc_flags |= RX_ENC_FLAG_SHORTPRE;
 493
 494         if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
 495                 /*
 496                  * We know which subframes of an A-MPDU belong
 497                  * together since we get a single PHY response
 498                  * from the firmware for all of them
 499                  */
 500                 rx_status->flag |= RX_FLAG_AMPDU_DETAILS;
 501                 rx_status->ampdu_reference = mvm->ampdu_ref;
 502         }
 503
 504         /* Set up the HT phy flags */
 505         switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
 506         case RATE_MCS_CHAN_WIDTH_20:
 507                 break;
 508         case RATE_MCS_CHAN_WIDTH_40:
 509                 rx_status->bw = RATE_INFO_BW_40;
 510                 break;
 511         case RATE_MCS_CHAN_WIDTH_80:
 512                 rx_status->bw = RATE_INFO_BW_80;
 513                 break;
 514         case RATE_MCS_CHAN_WIDTH_160:
 515                 rx_status->bw = RATE_INFO_BW_160;
 516                 break;
 517         }
 518         if (!(rate_n_flags & RATE_MCS_CCK_MSK) &&
 519             rate_n_flags & RATE_MCS_SGI_MSK)
 520                 rx_status->enc_flags |= RX_ENC_FLAG_SHORT_GI;
 521         if (rate_n_flags & RATE_HT_MCS_GF_MSK)
 522                 rx_status->enc_flags |= RX_ENC_FLAG_HT_GF;
 523         if (rate_n_flags & RATE_MCS_LDPC_MSK)
 524                 rx_status->enc_flags |= RX_ENC_FLAG_LDPC;
 525         if (rate_n_flags & RATE_MCS_HT_MSK) {
 526                 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >>
 527                                 RATE_MCS_STBC_POS;
 528                 rx_status->encoding = RX_ENC_HT;
 529                 rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
 530                 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT;
 531         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 532                 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >>
 533                                 RATE_MCS_STBC_POS;
 534                 rx_status->nss =
 535                         ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
 536                                                 RATE_VHT_MCS_NSS_POS) + 1;
 537                 rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 538                 rx_status->encoding = RX_ENC_VHT;
 539                 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT;
 540                 if (rate_n_flags & RATE_MCS_BF_MSK)
 541                         rx_status->enc_flags |= RX_ENC_FLAG_BF;
 542         } else {
 543                 int rate = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
 544                                                                rx_status->band);
 545
 546                 if (WARN(rate < 0 || rate > 0xFF,
 547                          "Invalid rate flags 0x%x, band %d,\n",
 548                          rate_n_flags, rx_status->band)) {
 549                         kfree_skb(skb);
 550                         return;
 551                 }
 552                 rx_status->rate_idx = rate;
 553         }
 554
 555 #ifdef CONFIG_IWLWIFI_DEBUGFS
 556         iwl_mvm_update_frame_stats(mvm, rate_n_flags,
 557                                    rx_status->flag & RX_FLAG_AMPDU_DETAILS);
 558 #endif
 559
 560         if (unlikely((ieee80211_is_beacon(hdr->frame_control) ||
 561                       ieee80211_is_probe_resp(hdr->frame_control)) &&
 562                      mvm->sched_scan_pass_all == SCHED_SCAN_PASS_ALL_ENABLED))
 563                 mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_FOUND;
 564
 565         if (unlikely(ieee80211_is_beacon(hdr->frame_control) ||
 566                      ieee80211_is_probe_resp(hdr->frame_control)))
 567                 rx_status->boottime_ns = ktime_get_boot_ns();
 568
 569         /* Take a reference briefly to kick off a d0i3 entry delay so
 570          * we can handle bursts of RX packets without toggling the
 571          * state too often.  But don't do this for beacons if we are
 572          * going to idle because the beacon filtering changes we make
 573          * cause the firmware to send us collateral beacons. */
 574         take_ref = !(test_bit(STATUS_TRANS_GOING_IDLE, &mvm->trans->status) &&
 575                      ieee80211_is_beacon(hdr->frame_control));
 576
 577         if (take_ref)
 578                 iwl_mvm_ref(mvm, IWL_MVM_REF_RX);
 579
 580         iwl_mvm_pass_packet_to_mac80211(mvm, sta, napi, skb, hdr, len,
 581                                         crypt_len, rxb);
 582
 583         if (take_ref)
 584                 iwl_mvm_unref(mvm, IWL_MVM_REF_RX);
 585 }
 586
 587 struct iwl_mvm_stat_data {
 588         struct iwl_mvm *mvm;
 589         __le32 mac_id;
 590         u8 beacon_filter_average_energy;
 591         void *general;
 592 };
 593
 594 static void iwl_mvm_stat_iterator(void *_data, u8 *mac,
 595                                   struct ieee80211_vif *vif)
 596 {
 597         struct iwl_mvm_stat_data *data = _data;
 598         struct iwl_mvm *mvm = data->mvm;
 599         int sig = -data->beacon_filter_average_energy;
 600         int last_event;
 601         int thold = vif->bss_conf.cqm_rssi_thold;
 602         int hyst = vif->bss_conf.cqm_rssi_hyst;
 603         u16 id = le32_to_cpu(data->mac_id);
 604         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 605
 606         /* This doesn't need the MAC ID check since it's not taking the
 607          * data copied into the "data" struct, but rather the data from
 608          * the notification directly.
 609          */
 610         if (data->general) {
 611                 u16 vif_id = mvmvif->id;
 612
 613                 if (iwl_mvm_is_cdb_supported(mvm)) {
 614                         struct mvm_statistics_general_cdb *general =
 615                                 data->general;
 616
 617                         mvmvif->beacon_stats.num_beacons =
 618                                 le32_to_cpu(general->beacon_counter[vif_id]);
 619                         mvmvif->beacon_stats.avg_signal =
 620                                 -general->beacon_average_energy[vif_id];
 621                 } else {
 622                         struct mvm_statistics_general_v8 *general =
 623                                 data->general;
 624
 625                         mvmvif->beacon_stats.num_beacons =
 626                                 le32_to_cpu(general->beacon_counter[vif_id]);
 627                         mvmvif->beacon_stats.avg_signal =
 628                                 -general->beacon_average_energy[vif_id];
 629                 }
 630         }
 631
 632         if (mvmvif->id != id)
 633                 return;
 634
 635         if (vif->type != NL80211_IFTYPE_STATION)
 636                 return;
 637
 638         if (sig == 0) {
 639                 IWL_DEBUG_RX(mvm, "RSSI is 0 - skip signal based decision\n");
 640                 return;
 641         }
 642
 643         mvmvif->bf_data.ave_beacon_signal = sig;
 644
 645         /* BT Coex */
 646         if (mvmvif->bf_data.bt_coex_min_thold !=
 647             mvmvif->bf_data.bt_coex_max_thold) {
 648                 last_event = mvmvif->bf_data.last_bt_coex_event;
 649                 if (sig > mvmvif->bf_data.bt_coex_max_thold &&
 650                     (last_event <= mvmvif->bf_data.bt_coex_min_thold ||
 651                      last_event == 0)) {
 652                         mvmvif->bf_data.last_bt_coex_event = sig;
 653                         IWL_DEBUG_RX(mvm, "cqm_iterator bt coex high %d\n",
 654                                      sig);
 655                         iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_HIGH);
 656                 } else if (sig < mvmvif->bf_data.bt_coex_min_thold &&
 657                            (last_event >= mvmvif->bf_data.bt_coex_max_thold ||
 658                             last_event == 0)) {
 659                         mvmvif->bf_data.last_bt_coex_event = sig;
 660                         IWL_DEBUG_RX(mvm, "cqm_iterator bt coex low %d\n",
 661                                      sig);
 662                         iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_LOW);
 663                 }
 664         }
 665
 666         if (!(vif->driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI))
 667                 return;
 668
 669         /* CQM Notification */
 670         last_event = mvmvif->bf_data.last_cqm_event;
 671         if (thold && sig < thold && (last_event == 0 ||
 672                                      sig < last_event - hyst)) {
 673                 mvmvif->bf_data.last_cqm_event = sig;
 674                 IWL_DEBUG_RX(mvm, "cqm_iterator cqm low %d\n",
 675                              sig);
 676                 ieee80211_cqm_rssi_notify(
 677                         vif,
 678                         NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
 679                         sig,
 680                         GFP_KERNEL);
 681         } else if (sig > thold &&
 682                    (last_event == 0 || sig > last_event + hyst)) {
 683                 mvmvif->bf_data.last_cqm_event = sig;
 684                 IWL_DEBUG_RX(mvm, "cqm_iterator cqm high %d\n",
 685                              sig);
 686                 ieee80211_cqm_rssi_notify(
 687                         vif,
 688                         NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
 689                         sig,
 690                         GFP_KERNEL);
 691         }
 692 }
 693
 694 static inline void
 695 iwl_mvm_rx_stats_check_trigger(struct iwl_mvm *mvm, struct iwl_rx_packet *pkt)
 696 {
 697         struct iwl_fw_dbg_trigger_tlv *trig;
 698         struct iwl_fw_dbg_trigger_stats *trig_stats;
 699         u32 trig_offset, trig_thold;
 700
 701         if (!iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_STATS))
 702                 return;
 703
 704         trig = iwl_fw_dbg_get_trigger(mvm->fw, FW_DBG_TRIGGER_STATS);
 705         trig_stats = (void *)trig->data;
 706
 707         if (!iwl_fw_dbg_trigger_check_stop(&mvm->fwrt, NULL, trig))
 708                 return;
 709
 710         trig_offset = le32_to_cpu(trig_stats->stop_offset);
 711         trig_thold = le32_to_cpu(trig_stats->stop_threshold);
 712
 713         if (WARN_ON_ONCE(trig_offset >= iwl_rx_packet_payload_len(pkt)))
 714                 return;
 715
 716         if (le32_to_cpup((__le32 *) (pkt->data + trig_offset)) < trig_thold)
 717                 return;
 718
 719         iwl_fw_dbg_collect_trig(&mvm->fwrt, trig, NULL);
 720 }
 721
 722 void iwl_mvm_handle_rx_statistics(struct iwl_mvm *mvm,
 723                                   struct iwl_rx_packet *pkt)
 724 {
 725         struct iwl_mvm_stat_data data = {
 726                 .mvm = mvm,
 727         };
 728         int expected_size;
 729         int i;
 730         u8 *energy;
 731         __le32 *bytes;
 732         __le32 *air_time;
 733         __le32 flags;
 734
 735         if (!iwl_mvm_has_new_rx_stats_api(mvm)) {
 736                 if (iwl_mvm_has_new_rx_api(mvm))
 737                         expected_size = sizeof(struct iwl_notif_statistics_v11);
 738                 else
 739                         expected_size = sizeof(struct iwl_notif_statistics_v10);
 740         } else {
 741                 expected_size = sizeof(struct iwl_notif_statistics_cdb);
 742         }
 743
 744         if (WARN_ONCE(iwl_rx_packet_payload_len(pkt) != expected_size,
 745                       "received invalid statistics size (%d)!\n",
 746                       iwl_rx_packet_payload_len(pkt)))
 747                 return;
 748
 749         if (!iwl_mvm_has_new_rx_stats_api(mvm)) {
 750                 struct iwl_notif_statistics_v11 *stats = (void *)&pkt->data;
 751
 752                 data.mac_id = stats->rx.general.mac_id;
 753                 data.beacon_filter_average_energy =
 754                         stats->general.common.beacon_filter_average_energy;
 755
 756                 mvm->rx_stats_v3 = stats->rx;
 757
 758                 mvm->radio_stats.rx_time =
 759                         le64_to_cpu(stats->general.common.rx_time);
 760                 mvm->radio_stats.tx_time =
 761                         le64_to_cpu(stats->general.common.tx_time);
 762                 mvm->radio_stats.on_time_rf =
 763                         le64_to_cpu(stats->general.common.on_time_rf);
 764                 mvm->radio_stats.on_time_scan =
 765                         le64_to_cpu(stats->general.common.on_time_scan);
 766
 767                 data.general = &stats->general;
 768
 769                 flags = stats->flag;
 770         } else {
 771                 struct iwl_notif_statistics_cdb *stats = (void *)&pkt->data;
 772
 773                 data.mac_id = stats->rx.general.mac_id;
 774                 data.beacon_filter_average_energy =
 775                         stats->general.common.beacon_filter_average_energy;
 776
 777                 mvm->rx_stats = stats->rx;
 778
 779                 mvm->radio_stats.rx_time =
 780                         le64_to_cpu(stats->general.common.rx_time);
 781                 mvm->radio_stats.tx_time =
 782                         le64_to_cpu(stats->general.common.tx_time);
 783                 mvm->radio_stats.on_time_rf =
 784                         le64_to_cpu(stats->general.common.on_time_rf);
 785                 mvm->radio_stats.on_time_scan =
 786                         le64_to_cpu(stats->general.common.on_time_scan);
 787
 788                 data.general = &stats->general;
 789
 790                 flags = stats->flag;
 791         }
 792
 793         iwl_mvm_rx_stats_check_trigger(mvm, pkt);
 794
 795         ieee80211_iterate_active_interfaces(mvm->hw,
 796                                             IEEE80211_IFACE_ITER_NORMAL,
 797                                             iwl_mvm_stat_iterator,
 798                                             &data);
 799
 800         if (!iwl_mvm_has_new_rx_api(mvm))
 801                 return;
 802
 803         if (!iwl_mvm_has_new_rx_stats_api(mvm)) {
 804                 struct iwl_notif_statistics_v11 *v11 = (void *)&pkt->data;
 805
 806                 energy = (void *)&v11->load_stats.avg_energy;
 807                 bytes = (void *)&v11->load_stats.byte_count;
 808                 air_time = (void *)&v11->load_stats.air_time;
 809         } else {
 810                 struct iwl_notif_statistics_cdb *stats = (void *)&pkt->data;
 811
 812                 energy = (void *)&stats->load_stats.avg_energy;
 813                 bytes = (void *)&stats->load_stats.byte_count;
 814                 air_time = (void *)&stats->load_stats.air_time;
 815         }
 816
 817         rcu_read_lock();
 818         for (i = 0; i < ARRAY_SIZE(mvm->fw_id_to_mac_id); i++) {
 819                 struct iwl_mvm_sta *sta;
 820
 821                 if (!energy[i])
 822                         continue;
 823
 824                 sta = iwl_mvm_sta_from_staid_rcu(mvm, i);
 825                 if (!sta)
 826                         continue;
 827                 sta->avg_energy = energy[i];
 828         }
 829         rcu_read_unlock();
 830
 831         /*
 832          * Don't update in case the statistics are not cleared, since
 833          * we will end up counting twice the same airtime, once in TCM
 834          * request and once in statistics notification.
 835          */
 836         if (!(le32_to_cpu(flags) & IWL_STATISTICS_REPLY_FLG_CLEAR))
 837                 return;
 838
 839         spin_lock(&mvm->tcm.lock);
 840         for (i = 0; i < NUM_MAC_INDEX_DRIVER; i++) {
 841                 struct iwl_mvm_tcm_mac *mdata = &mvm->tcm.data[i];
 842                 u32 airtime = le32_to_cpu(air_time[i]);
 843                 u32 rx_bytes = le32_to_cpu(bytes[i]);
 844
 845                 mdata->uapsd_nonagg_detect.rx_bytes += rx_bytes;
 846                 if (airtime) {
 847                         /* re-init every time to store rate from FW */
 848                         ewma_rate_init(&mdata->uapsd_nonagg_detect.rate);
 849                         ewma_rate_add(&mdata->uapsd_nonagg_detect.rate,
 850                                       rx_bytes * 8 / airtime);
 851                 }
 852
 853                 mdata->rx.airtime += airtime;
 854         }
 855         spin_unlock(&mvm->tcm.lock);
 856 }
 857
 858 void iwl_mvm_rx_statistics(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
 859 {
 860         iwl_mvm_handle_rx_statistics(mvm, rxb_addr(rxb));
 861 }
 862
 863 void iwl_mvm_window_status_notif(struct iwl_mvm *mvm,
 864                                  struct iwl_rx_cmd_buffer *rxb)
 865 {
 866         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 867         struct iwl_ba_window_status_notif *notif = (void *)pkt->data;
 868         int i;
 869         u32 pkt_len = iwl_rx_packet_payload_len(pkt);
 870
 871         if (WARN_ONCE(pkt_len != sizeof(*notif),
 872                       "Received window status notification of wrong size (%u)\n",
 873                       pkt_len))
 874                 return;
 875
 876         rcu_read_lock();
 877         for (i = 0; i < BA_WINDOW_STREAMS_MAX; i++) {
 878                 struct ieee80211_sta *sta;
 879                 u8 sta_id, tid;
 880                 u64 bitmap;
 881                 u32 ssn;
 882                 u16 ratid;
 883                 u16 received_mpdu;
 884
 885                 ratid = le16_to_cpu(notif->ra_tid[i]);
 886                 /* check that this TID is valid */
 887                 if (!(ratid & BA_WINDOW_STATUS_VALID_MSK))
 888                         continue;
 889
 890                 received_mpdu = le16_to_cpu(notif->mpdu_rx_count[i]);
 891                 if (received_mpdu == 0)
 892                         continue;
 893
 894                 tid = ratid & BA_WINDOW_STATUS_TID_MSK;
 895                 /* get the station */
 896                 sta_id = (ratid & BA_WINDOW_STATUS_STA_ID_MSK)
 897                          >> BA_WINDOW_STATUS_STA_ID_POS;
 898                 sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
 899                 if (IS_ERR_OR_NULL(sta))
 900                         continue;
 901                 bitmap = le64_to_cpu(notif->bitmap[i]);
 902                 ssn = le32_to_cpu(notif->start_seq_num[i]);
 903
 904                 /* update mac80211 with the bitmap for the reordering buffer */
 905                 ieee80211_mark_rx_ba_filtered_frames(sta, tid, ssn, bitmap,
 906                                                      received_mpdu);
 907         }
 908         rcu_read_unlock();
 909 }