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

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
iwl_mvm_rx_rx_phy_cmd
iwl_mvm_pass_packet_to_mac80211
iwl_mvm_get_signal_strength
iwl_mvm_set_mac80211_rx_flag
iwl_mvm_rx_handle_tcm
iwl_mvm_rx_csum
iwl_mvm_rx_rx_mpdu
iwl_mvm_stat_iterator
iwl_mvm_rx_stats_check_trigger
iwl_mvm_handle_rx_statistics
iwl_mvm_rx_statistics
iwl_mvm_window_status_notif
   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  * Copyright(c) 2018 - 2020 Intel Corporation
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of version 2 of the GNU General Public License as
  15  * published by the Free Software Foundation.
  16  *
  17  * This program is distributed in the hope that it will be useful, but
  18  * WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20  * General Public License for more details.
  21  *
  22  * The full GNU General Public License is included in this distribution
  23  * in the file called COPYING.
  24  *
  25  * Contact Information:
  26  *  Intel Linux Wireless <linuxwifi@intel.com>
  27  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  28  *
  29  * BSD LICENSE
  30  *
  31  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  32  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
  33  * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
  34  * Copyright(c) 2018 - 2020 Intel Corporation
  35  * All rights reserved.
  36  *
  37  * Redistribution and use in source and binary forms, with or without
  38  * modification, are permitted provided that the following conditions
  39  * are met:
  40  *
  41  *  * Redistributions of source code must retain the above copyright
  42  *    notice, this list of conditions and the following disclaimer.
  43  *  * Redistributions in binary form must reproduce the above copyright
  44  *    notice, this list of conditions and the following disclaimer in
  45  *    the documentation and/or other materials provided with the
  46  *    distribution.
  47  *  * Neither the name Intel Corporation nor the names of its
  48  *    contributors may be used to endorse or promote products derived
  49  *    from this software without specific prior written permission.
  50  *
  51  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  52  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  53  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  54  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  55  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  56  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  57  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  58  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  59  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  60  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  61  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  62  *****************************************************************************/
  63 #include <asm/unaligned.h>
  64 #include <linux/etherdevice.h>
  65 #include <linux/skbuff.h>
  66 #include "iwl-trans.h"
  67 #include "mvm.h"
  68 #include "fw-api.h"
  69 
  70 /*
  71  * iwl_mvm_rx_rx_phy_cmd - REPLY_RX_PHY_CMD handler
  72  *
  73  * Copies the phy information in mvm->last_phy_info, it will be used when the
  74  * actual data will come from the fw in the next packet.
  75  */
  76 void iwl_mvm_rx_rx_phy_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
  77 {
  78         struct iwl_rx_packet *pkt = rxb_addr(rxb);
  79 
  80         memcpy(&mvm->last_phy_info, pkt->data, sizeof(mvm->last_phy_info));
  81         mvm->ampdu_ref++;
  82 
  83 #ifdef CONFIG_IWLWIFI_DEBUGFS
  84         if (mvm->last_phy_info.phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
  85                 spin_lock(&mvm->drv_stats_lock);
  86                 mvm->drv_rx_stats.ampdu_count++;
  87                 spin_unlock(&mvm->drv_stats_lock);
  88         }
  89 #endif
  90 }
  91 
  92 /*
  93  * iwl_mvm_pass_packet_to_mac80211 - builds the packet for mac80211
  94  *
  95  * Adds the rxb to a new skb and give it to mac80211
  96  */
  97 static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm,
  98                                             struct ieee80211_sta *sta,
  99                                             struct napi_struct *napi,
 100                                             struct sk_buff *skb,
 101                                             struct ieee80211_hdr *hdr, u16 len,
 102                                             u8 crypt_len,
 103                                             struct iwl_rx_cmd_buffer *rxb)
 104 {
 105         unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
 106         unsigned int fraglen;
 107 
 108         /*
 109          * The 'hdrlen' (plus the 8 bytes for the SNAP and the crypt_len,
 110          * but those are all multiples of 4 long) all goes away, but we
 111          * want the *end* of it, which is going to be the start of the IP
 112          * header, to be aligned when it gets pulled in.
 113          * The beginning of the skb->data is aligned on at least a 4-byte
 114          * boundary after allocation. Everything here is aligned at least
 115          * on a 2-byte boundary so we can just take hdrlen & 3 and pad by
 116          * the result.
 117          */
 118         skb_reserve(skb, hdrlen & 3);
 119 
 120         /* If frame is small enough to fit in skb->head, pull it completely.
 121          * If not, only pull ieee80211_hdr (including crypto if present, and
 122          * an additional 8 bytes for SNAP/ethertype, see below) so that
 123          * splice() or TCP coalesce are more efficient.
 124          *
 125          * Since, in addition, ieee80211_data_to_8023() always pull in at
 126          * least 8 bytes (possibly more for mesh) we can do the same here
 127          * to save the cost of doing it later. That still doesn't pull in
 128          * the actual IP header since the typical case has a SNAP header.
 129          * If the latter changes (there are efforts in the standards group
 130          * to do so) we should revisit this and ieee80211_data_to_8023().
 131          */
 132         hdrlen = (len <= skb_tailroom(skb)) ? len : hdrlen + crypt_len + 8;
 133 
 134         skb_put_data(skb, hdr, hdrlen);
 135         fraglen = len - hdrlen;
 136 
 137         if (fraglen) {
 138                 int offset = (void *)hdr + hdrlen -
 139                              rxb_addr(rxb) + rxb_offset(rxb);
 140 
 141                 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
 142                                 fraglen, rxb->truesize);
 143         }
 144 
 145         ieee80211_rx_napi(mvm->hw, sta, skb, napi);
 146 }
 147 
 148 /*
 149  * iwl_mvm_get_signal_strength - use new rx PHY INFO API
 150  * values are reported by the fw as positive values - need to negate
 151  * to obtain their dBM.  Account for missing antennas by replacing 0
 152  * values by -256dBm: practically 0 power and a non-feasible 8 bit value.
 153  */
 154 static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm,
 155                                         struct iwl_rx_phy_info *phy_info,
 156                                         struct ieee80211_rx_status *rx_status)
 157 {
 158         int energy_a, energy_b, energy_c, max_energy;
 159         u32 val;
 160 
 161         val =
 162             le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_ENERGY_ANT_ABC_IDX]);
 163         energy_a = (val & IWL_RX_INFO_ENERGY_ANT_A_MSK) >>
 164                                                 IWL_RX_INFO_ENERGY_ANT_A_POS;
 165         energy_a = energy_a ? -energy_a : S8_MIN;
 166         energy_b = (val & IWL_RX_INFO_ENERGY_ANT_B_MSK) >>
 167                                                 IWL_RX_INFO_ENERGY_ANT_B_POS;
 168         energy_b = energy_b ? -energy_b : S8_MIN;
 169         energy_c = (val & IWL_RX_INFO_ENERGY_ANT_C_MSK) >>
 170                                                 IWL_RX_INFO_ENERGY_ANT_C_POS;
 171         energy_c = energy_c ? -energy_c : S8_MIN;
 172         max_energy = max(energy_a, energy_b);
 173         max_energy = max(max_energy, energy_c);
 174 
 175         IWL_DEBUG_STATS(mvm, "energy In A %d B %d C %d , and max %d\n",
 176                         energy_a, energy_b, energy_c, max_energy);
 177 
 178         rx_status->signal = max_energy;
 179         rx_status->chains = (le16_to_cpu(phy_info->phy_flags) &
 180                                 RX_RES_PHY_FLAGS_ANTENNA)
 181                                         >> RX_RES_PHY_FLAGS_ANTENNA_POS;
 182         rx_status->chain_signal[0] = energy_a;
 183         rx_status->chain_signal[1] = energy_b;
 184         rx_status->chain_signal[2] = energy_c;
 185 }
 186 
 187 /*
 188  * iwl_mvm_set_mac80211_rx_flag - translate fw status to mac80211 format
 189  * @mvm: the mvm object
 190  * @hdr: 80211 header
 191  * @stats: status in mac80211's format
 192  * @rx_pkt_status: status coming from fw
 193  *
 194  * returns non 0 value if the packet should be dropped
 195  */
 196 static u32 iwl_mvm_set_mac80211_rx_flag(struct iwl_mvm *mvm,
 197                                         struct ieee80211_hdr *hdr,
 198                                         struct ieee80211_rx_status *stats,
 199                                         u32 rx_pkt_status,
 200                                         u8 *crypt_len)
 201 {
 202         if (!ieee80211_has_protected(hdr->frame_control) ||
 203             (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 204                              RX_MPDU_RES_STATUS_SEC_NO_ENC)
 205                 return 0;
 206 
 207         /* packet was encrypted with unknown alg */
 208         if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 209                                         RX_MPDU_RES_STATUS_SEC_ENC_ERR)
 210                 return 0;
 211 
 212         switch (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) {
 213         case RX_MPDU_RES_STATUS_SEC_CCM_ENC:
 214                 /* alg is CCM: check MIC only */
 215                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
 216                         return -1;
 217 
 218                 stats->flag |= RX_FLAG_DECRYPTED;
 219                 *crypt_len = IEEE80211_CCMP_HDR_LEN;
 220                 return 0;
 221 
 222         case RX_MPDU_RES_STATUS_SEC_TKIP_ENC:
 223                 /* Don't drop the frame and decrypt it in SW */
 224                 if (!fw_has_api(&mvm->fw->ucode_capa,
 225                                 IWL_UCODE_TLV_API_DEPRECATE_TTAK) &&
 226                     !(rx_pkt_status & RX_MPDU_RES_STATUS_TTAK_OK))
 227                         return 0;
 228                 *crypt_len = IEEE80211_TKIP_IV_LEN;
 229                 /* fall through */
 230 
 231         case RX_MPDU_RES_STATUS_SEC_WEP_ENC:
 232                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_ICV_OK))
 233                         return -1;
 234 
 235                 stats->flag |= RX_FLAG_DECRYPTED;
 236                 if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 237                                 RX_MPDU_RES_STATUS_SEC_WEP_ENC)
 238                         *crypt_len = IEEE80211_WEP_IV_LEN;
 239                 return 0;
 240 
 241         case RX_MPDU_RES_STATUS_SEC_EXT_ENC:
 242                 if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
 243                         return -1;
 244                 stats->flag |= RX_FLAG_DECRYPTED;
 245                 return 0;
 246 
 247         default:
 248                 /* Expected in monitor (not having the keys) */
 249                 if (!mvm->monitor_on)
 250                         IWL_ERR(mvm, "Unhandled alg: 0x%x\n", rx_pkt_status);
 251         }
 252 
 253         return 0;
 254 }
 255 
 256 static void iwl_mvm_rx_handle_tcm(struct iwl_mvm *mvm,
 257                                   struct ieee80211_sta *sta,
 258                                   struct ieee80211_hdr *hdr, u32 len,
 259                                   struct iwl_rx_phy_info *phy_info,
 260                                   u32 rate_n_flags)
 261 {
 262         struct iwl_mvm_sta *mvmsta;
 263         struct iwl_mvm_tcm_mac *mdata;
 264         int mac;
 265         int ac = IEEE80211_AC_BE; /* treat non-QoS as BE */
 266         struct iwl_mvm_vif *mvmvif;
 267         /* expected throughput in 100Kbps, single stream, 20 MHz */
 268         static const u8 thresh_tpt[] = {
 269                 9, 18, 30, 42, 60, 78, 90, 96, 120, 135,
 270         };
 271         u16 thr;
 272 
 273         if (ieee80211_is_data_qos(hdr->frame_control))
 274                 ac = tid_to_mac80211_ac[ieee80211_get_tid(hdr)];
 275 
 276         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 277         mac = mvmsta->mac_id_n_color & FW_CTXT_ID_MSK;
 278 
 279         if (time_after(jiffies, mvm->tcm.ts + MVM_TCM_PERIOD))
 280                 schedule_delayed_work(&mvm->tcm.work, 0);
 281         mdata = &mvm->tcm.data[mac];
 282         mdata->rx.pkts[ac]++;
 283 
 284         /* count the airtime only once for each ampdu */
 285         if (mdata->rx.last_ampdu_ref != mvm->ampdu_ref) {
 286                 mdata->rx.last_ampdu_ref = mvm->ampdu_ref;
 287                 mdata->rx.airtime += le16_to_cpu(phy_info->frame_time);
 288         }
 289 
 290         if (!(rate_n_flags & (RATE_MCS_HT_MSK | RATE_MCS_VHT_MSK)))
 291                 return;
 292 
 293         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
 294 
 295         if (mdata->opened_rx_ba_sessions ||
 296             mdata->uapsd_nonagg_detect.detected ||
 297             (!mvmvif->queue_params[IEEE80211_AC_VO].uapsd &&
 298              !mvmvif->queue_params[IEEE80211_AC_VI].uapsd &&
 299              !mvmvif->queue_params[IEEE80211_AC_BE].uapsd &&
 300              !mvmvif->queue_params[IEEE80211_AC_BK].uapsd) ||
 301             mvmsta->sta_id != mvmvif->ap_sta_id)
 302                 return;
 303 
 304         if (rate_n_flags & RATE_MCS_HT_MSK) {
 305                 thr = thresh_tpt[rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK];
 306                 thr *= 1 + ((rate_n_flags & RATE_HT_MCS_NSS_MSK) >>
 307                                         RATE_HT_MCS_NSS_POS);
 308         } else {
 309                 if (WARN_ON((rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK) >=
 310                                 ARRAY_SIZE(thresh_tpt)))
 311                         return;
 312                 thr = thresh_tpt[rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK];
 313                 thr *= 1 + ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
 314                                         RATE_VHT_MCS_NSS_POS);
 315         }
 316 
 317         thr <<= ((rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) >>
 318                                 RATE_MCS_CHAN_WIDTH_POS);
 319 
 320         mdata->uapsd_nonagg_detect.rx_bytes += len;
 321         ewma_rate_add(&mdata->uapsd_nonagg_detect.rate, thr);
 322 }
 323 
 324 static void iwl_mvm_rx_csum(struct ieee80211_sta *sta,
 325                             struct sk_buff *skb,
 326                             u32 status)
 327 {
 328         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 329         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
 330 
 331         if (mvmvif->features & NETIF_F_RXCSUM &&
 332             status & RX_MPDU_RES_STATUS_CSUM_DONE &&
 333             status & RX_MPDU_RES_STATUS_CSUM_OK)
 334                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 335 }
 336 
 337 /*
 338  * iwl_mvm_rx_rx_mpdu - REPLY_RX_MPDU_CMD handler
 339  *
 340  * Handles the actual data of the Rx packet from the fw
 341  */
 342 void iwl_mvm_rx_rx_mpdu(struct iwl_mvm *mvm, struct napi_struct *napi,
 343                         struct iwl_rx_cmd_buffer *rxb)
 344 {
 345         struct ieee80211_hdr *hdr;
 346         struct ieee80211_rx_status *rx_status;
 347         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 348         struct iwl_rx_phy_info *phy_info;
 349         struct iwl_rx_mpdu_res_start *rx_res;
 350         struct ieee80211_sta *sta = NULL;
 351         struct sk_buff *skb;
 352         u32 len;
 353         u32 rate_n_flags;
 354         u32 rx_pkt_status;
 355         u8 crypt_len = 0;
 356 
 357         phy_info = &mvm->last_phy_info;
 358         rx_res = (struct iwl_rx_mpdu_res_start *)pkt->data;
 359         hdr = (struct ieee80211_hdr *)(pkt->data + sizeof(*rx_res));
 360         len = le16_to_cpu(rx_res->byte_count);
 361         rx_pkt_status = get_unaligned_le32((__le32 *)
 362                 (pkt->data + sizeof(*rx_res) + len));
 363 
 364         /* Dont use dev_alloc_skb(), we'll have enough headroom once
 365          * ieee80211_hdr pulled.
 366          */
 367         skb = alloc_skb(128, GFP_ATOMIC);
 368         if (!skb) {
 369                 IWL_ERR(mvm, "alloc_skb failed\n");
 370                 return;
 371         }
 372 
 373         rx_status = IEEE80211_SKB_RXCB(skb);
 374 
 375         /*
 376          * drop the packet if it has failed being decrypted by HW
 377          */
 378         if (iwl_mvm_set_mac80211_rx_flag(mvm, hdr, rx_status, rx_pkt_status,
 379                                          &crypt_len)) {
 380                 IWL_DEBUG_DROP(mvm, "Bad decryption results 0x%08x\n",
 381                                rx_pkt_status);
 382                 kfree_skb(skb);
 383                 return;
 384         }
 385 
 386         /*
 387          * Keep packets with CRC errors (and with overrun) for monitor mode
 388          * (otherwise the firmware discards them) but mark them as bad.
 389          */
 390         if (!(rx_pkt_status & RX_MPDU_RES_STATUS_CRC_OK) ||
 391             !(rx_pkt_status & RX_MPDU_RES_STATUS_OVERRUN_OK)) {
 392                 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n", rx_pkt_status);
 393                 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
 394         }
 395 
 396         /* This will be used in several places later */
 397         rate_n_flags = le32_to_cpu(phy_info->rate_n_flags);
 398 
 399         /* rx_status carries information about the packet to mac80211 */
 400         rx_status->mactime = le64_to_cpu(phy_info->timestamp);
 401         rx_status->device_timestamp = le32_to_cpu(phy_info->system_timestamp);
 402         rx_status->band =
 403                 (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_BAND_24)) ?
 404                                 NL80211_BAND_2GHZ : NL80211_BAND_5GHZ;
 405         rx_status->freq =
 406                 ieee80211_channel_to_frequency(le16_to_cpu(phy_info->channel),
 407                                                rx_status->band);
 408 
 409         /* TSF as indicated by the firmware  is at INA time */
 410         rx_status->flag |= RX_FLAG_MACTIME_PLCP_START;
 411 
 412         iwl_mvm_get_signal_strength(mvm, phy_info, rx_status);
 413 
 414         IWL_DEBUG_STATS_LIMIT(mvm, "Rssi %d, TSF %llu\n", rx_status->signal,
 415                               (unsigned long long)rx_status->mactime);
 416 
 417         rcu_read_lock();
 418         if (rx_pkt_status & RX_MPDU_RES_STATUS_SRC_STA_FOUND) {
 419                 u32 id = rx_pkt_status & RX_MPDU_RES_STATUS_STA_ID_MSK;
 420 
 421                 id >>= RX_MDPU_RES_STATUS_STA_ID_SHIFT;
 422 
 423                 if (!WARN_ON_ONCE(id >= ARRAY_SIZE(mvm->fw_id_to_mac_id))) {
 424                         sta = rcu_dereference(mvm->fw_id_to_mac_id[id]);
 425                         if (IS_ERR(sta))
 426                                 sta = NULL;
 427                 }
 428         } else if (!is_multicast_ether_addr(hdr->addr2)) {
 429                 /* This is fine since we prevent two stations with the same
 430                  * address from being added.
 431                  */
 432                 sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL);
 433         }
 434 
 435         if (sta) {
 436                 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 437                 struct ieee80211_vif *tx_blocked_vif =
 438                         rcu_dereference(mvm->csa_tx_blocked_vif);
 439                 struct iwl_fw_dbg_trigger_tlv *trig;
 440                 struct ieee80211_vif *vif = mvmsta->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) && vif == tx_blocked_vif) {
 447                         struct iwl_mvm_vif *mvmvif =
 448                                 iwl_mvm_vif_from_mac80211(tx_blocked_vif);
 449 
 450                         if (mvmvif->csa_target_freq == rx_status->freq)
 451                                 iwl_mvm_sta_modify_disable_tx_ap(mvm, sta,
 452                                                                  false);
 453                 }
 454 
 455                 rs_update_last_rssi(mvm, mvmsta, rx_status);
 456 
 457                 trig = iwl_fw_dbg_trigger_on(&mvm->fwrt,
 458                                              ieee80211_vif_to_wdev(vif),
 459                                              FW_DBG_TRIGGER_RSSI);
 460 
 461                 if (trig && ieee80211_is_beacon(hdr->frame_control)) {
 462                         struct iwl_fw_dbg_trigger_low_rssi *rssi_trig;
 463                         s32 rssi;
 464 
 465                         rssi_trig = (void *)trig->data;
 466                         rssi = le32_to_cpu(rssi_trig->rssi);
 467 
 468                         if (rx_status->signal < rssi)
 469                                 iwl_fw_dbg_collect_trig(&mvm->fwrt, trig,
 470                                                         NULL);
 471                 }
 472 
 473                 if (!mvm->tcm.paused && len >= sizeof(*hdr) &&
 474                     !is_multicast_ether_addr(hdr->addr1) &&
 475                     ieee80211_is_data(hdr->frame_control))
 476                         iwl_mvm_rx_handle_tcm(mvm, sta, hdr, len, phy_info,
 477                                               rate_n_flags);
 478 
 479                 if (ieee80211_is_data(hdr->frame_control))
 480                         iwl_mvm_rx_csum(sta, skb, rx_pkt_status);
 481         }
 482         rcu_read_unlock();
 483 
 484         /* set the preamble flag if appropriate */
 485         if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_SHORT_PREAMBLE))
 486                 rx_status->enc_flags |= RX_ENC_FLAG_SHORTPRE;
 487 
 488         if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
 489                 /*
 490                  * We know which subframes of an A-MPDU belong
 491                  * together since we get a single PHY response
 492                  * from the firmware for all of them
 493                  */
 494                 rx_status->flag |= RX_FLAG_AMPDU_DETAILS;
 495                 rx_status->ampdu_reference = mvm->ampdu_ref;
 496         }
 497 
 498         /* Set up the HT phy flags */
 499         switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
 500         case RATE_MCS_CHAN_WIDTH_20:
 501                 break;
 502         case RATE_MCS_CHAN_WIDTH_40:
 503                 rx_status->bw = RATE_INFO_BW_40;
 504                 break;
 505         case RATE_MCS_CHAN_WIDTH_80:
 506                 rx_status->bw = RATE_INFO_BW_80;
 507                 break;
 508         case RATE_MCS_CHAN_WIDTH_160:
 509                 rx_status->bw = RATE_INFO_BW_160;
 510                 break;
 511         }
 512         if (!(rate_n_flags & RATE_MCS_CCK_MSK) &&
 513             rate_n_flags & RATE_MCS_SGI_MSK)
 514                 rx_status->enc_flags |= RX_ENC_FLAG_SHORT_GI;
 515         if (rate_n_flags & RATE_HT_MCS_GF_MSK)
 516                 rx_status->enc_flags |= RX_ENC_FLAG_HT_GF;
 517         if (rate_n_flags & RATE_MCS_LDPC_MSK)
 518                 rx_status->enc_flags |= RX_ENC_FLAG_LDPC;
 519         if (rate_n_flags & RATE_MCS_HT_MSK) {
 520                 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >>
 521                                 RATE_MCS_STBC_POS;
 522                 rx_status->encoding = RX_ENC_HT;
 523                 rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
 524                 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT;
 525         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 526                 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >>
 527                                 RATE_MCS_STBC_POS;
 528                 rx_status->nss =
 529                         ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
 530                                                 RATE_VHT_MCS_NSS_POS) + 1;
 531                 rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 532                 rx_status->encoding = RX_ENC_VHT;
 533                 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT;
 534                 if (rate_n_flags & RATE_MCS_BF_MSK)
 535                         rx_status->enc_flags |= RX_ENC_FLAG_BF;
 536         } else {
 537                 int rate = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
 538                                                                rx_status->band);
 539 
 540                 if (WARN(rate < 0 || rate > 0xFF,
 541                          "Invalid rate flags 0x%x, band %d,\n",
 542                          rate_n_flags, rx_status->band)) {
 543                         kfree_skb(skb);
 544                         return;
 545                 }
 546                 rx_status->rate_idx = rate;
 547         }
 548 
 549 #ifdef CONFIG_IWLWIFI_DEBUGFS
 550         iwl_mvm_update_frame_stats(mvm, rate_n_flags,
 551                                    rx_status->flag & RX_FLAG_AMPDU_DETAILS);
 552 #endif
 553 
 554         if (unlikely((ieee80211_is_beacon(hdr->frame_control) ||
 555                       ieee80211_is_probe_resp(hdr->frame_control)) &&
 556                      mvm->sched_scan_pass_all == SCHED_SCAN_PASS_ALL_ENABLED))
 557                 mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_FOUND;
 558 
 559         if (unlikely(ieee80211_is_beacon(hdr->frame_control) ||
 560                      ieee80211_is_probe_resp(hdr->frame_control)))
 561                 rx_status->boottime_ns = ktime_get_boottime_ns();
 562 
 563         iwl_mvm_pass_packet_to_mac80211(mvm, sta, napi, skb, hdr, len,
 564                                         crypt_len, rxb);
 565 }
 566 
 567 struct iwl_mvm_stat_data {
 568         struct iwl_mvm *mvm;
 569         __le32 flags;
 570         __le32 mac_id;
 571         u8 beacon_filter_average_energy;
 572         void *general;
 573 };
 574 
 575 static void iwl_mvm_stat_iterator(void *_data, u8 *mac,
 576                                   struct ieee80211_vif *vif)
 577 {
 578         struct iwl_mvm_stat_data *data = _data;
 579         struct iwl_mvm *mvm = data->mvm;
 580         int sig = -data->beacon_filter_average_energy;
 581         int last_event;
 582         int thold = vif->bss_conf.cqm_rssi_thold;
 583         int hyst = vif->bss_conf.cqm_rssi_hyst;
 584         u16 id = le32_to_cpu(data->mac_id);
 585         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 586         u16 vif_id = mvmvif->id;
 587 
 588         /* This doesn't need the MAC ID check since it's not taking the
 589          * data copied into the "data" struct, but rather the data from
 590          * the notification directly.
 591          */
 592         if (iwl_mvm_has_new_rx_stats_api(mvm)) {
 593                 struct mvm_statistics_general *general =
 594                         data->general;
 595 
 596                 mvmvif->beacon_stats.num_beacons =
 597                         le32_to_cpu(general->beacon_counter[vif_id]);
 598                 mvmvif->beacon_stats.avg_signal =
 599                         -general->beacon_average_energy[vif_id];
 600         } else {
 601                 struct mvm_statistics_general_v8 *general =
 602                         data->general;
 603 
 604                 mvmvif->beacon_stats.num_beacons =
 605                         le32_to_cpu(general->beacon_counter[vif_id]);
 606                 mvmvif->beacon_stats.avg_signal =
 607                         -general->beacon_average_energy[vif_id];
 608         }
 609 
 610         /* make sure that beacon statistics don't go backwards with TCM
 611          * request to clear statistics
 612          */
 613         if (le32_to_cpu(data->flags) & IWL_STATISTICS_REPLY_FLG_CLEAR)
 614                 mvmvif->beacon_stats.accu_num_beacons +=
 615                         mvmvif->beacon_stats.num_beacons;
 616 
 617         if (mvmvif->id != id)
 618                 return;
 619 
 620         if (vif->type != NL80211_IFTYPE_STATION)
 621                 return;
 622 
 623         if (sig == 0) {
 624                 IWL_DEBUG_RX(mvm, "RSSI is 0 - skip signal based decision\n");
 625                 return;
 626         }
 627 
 628         mvmvif->bf_data.ave_beacon_signal = sig;
 629 
 630         /* BT Coex */
 631         if (mvmvif->bf_data.bt_coex_min_thold !=
 632             mvmvif->bf_data.bt_coex_max_thold) {
 633                 last_event = mvmvif->bf_data.last_bt_coex_event;
 634                 if (sig > mvmvif->bf_data.bt_coex_max_thold &&
 635                     (last_event <= mvmvif->bf_data.bt_coex_min_thold ||
 636                      last_event == 0)) {
 637                         mvmvif->bf_data.last_bt_coex_event = sig;
 638                         IWL_DEBUG_RX(mvm, "cqm_iterator bt coex high %d\n",
 639                                      sig);
 640                         iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_HIGH);
 641                 } else if (sig < mvmvif->bf_data.bt_coex_min_thold &&
 642                            (last_event >= mvmvif->bf_data.bt_coex_max_thold ||
 643                             last_event == 0)) {
 644                         mvmvif->bf_data.last_bt_coex_event = sig;
 645                         IWL_DEBUG_RX(mvm, "cqm_iterator bt coex low %d\n",
 646                                      sig);
 647                         iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_LOW);
 648                 }
 649         }
 650 
 651         if (!(vif->driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI))
 652                 return;
 653 
 654         /* CQM Notification */
 655         last_event = mvmvif->bf_data.last_cqm_event;
 656         if (thold && sig < thold && (last_event == 0 ||
 657                                      sig < last_event - hyst)) {
 658                 mvmvif->bf_data.last_cqm_event = sig;
 659                 IWL_DEBUG_RX(mvm, "cqm_iterator cqm low %d\n",
 660                              sig);
 661                 ieee80211_cqm_rssi_notify(
 662                         vif,
 663                         NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
 664                         sig,
 665                         GFP_KERNEL);
 666         } else if (sig > thold &&
 667                    (last_event == 0 || sig > last_event + hyst)) {
 668                 mvmvif->bf_data.last_cqm_event = sig;
 669                 IWL_DEBUG_RX(mvm, "cqm_iterator cqm high %d\n",
 670                              sig);
 671                 ieee80211_cqm_rssi_notify(
 672                         vif,
 673                         NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
 674                         sig,
 675                         GFP_KERNEL);
 676         }
 677 }
 678 
 679 static inline void
 680 iwl_mvm_rx_stats_check_trigger(struct iwl_mvm *mvm, struct iwl_rx_packet *pkt)
 681 {
 682         struct iwl_fw_dbg_trigger_tlv *trig;
 683         struct iwl_fw_dbg_trigger_stats *trig_stats;
 684         u32 trig_offset, trig_thold;
 685 
 686         trig = iwl_fw_dbg_trigger_on(&mvm->fwrt, NULL, FW_DBG_TRIGGER_STATS);
 687         if (!trig)
 688                 return;
 689 
 690         trig_stats = (void *)trig->data;
 691 
 692         trig_offset = le32_to_cpu(trig_stats->stop_offset);
 693         trig_thold = le32_to_cpu(trig_stats->stop_threshold);
 694 
 695         if (WARN_ON_ONCE(trig_offset >= iwl_rx_packet_payload_len(pkt)))
 696                 return;
 697 
 698         if (le32_to_cpup((__le32 *) (pkt->data + trig_offset)) < trig_thold)
 699                 return;
 700 
 701         iwl_fw_dbg_collect_trig(&mvm->fwrt, trig, NULL);
 702 }
 703 
 704 void iwl_mvm_handle_rx_statistics(struct iwl_mvm *mvm,
 705                                   struct iwl_rx_packet *pkt)
 706 {
 707         struct iwl_mvm_stat_data data = {
 708                 .mvm = mvm,
 709         };
 710         int expected_size;
 711         int i;
 712         u8 *energy;
 713         __le32 *bytes;
 714         __le32 *air_time;
 715         __le32 flags;
 716 
 717         if (!iwl_mvm_has_new_rx_stats_api(mvm)) {
 718                 if (iwl_mvm_has_new_rx_api(mvm))
 719                         expected_size = sizeof(struct iwl_notif_statistics_v11);
 720                 else
 721                         expected_size = sizeof(struct iwl_notif_statistics_v10);
 722         } else {
 723                 expected_size = sizeof(struct iwl_notif_statistics);
 724         }
 725 
 726         if (WARN_ONCE(iwl_rx_packet_payload_len(pkt) != expected_size,
 727                       "received invalid statistics size (%d)!\n",
 728                       iwl_rx_packet_payload_len(pkt)))
 729                 return;
 730 
 731         if (!iwl_mvm_has_new_rx_stats_api(mvm)) {
 732                 struct iwl_notif_statistics_v11 *stats = (void *)&pkt->data;
 733 
 734                 data.mac_id = stats->rx.general.mac_id;
 735                 data.beacon_filter_average_energy =
 736                         stats->general.common.beacon_filter_average_energy;
 737 
 738                 mvm->rx_stats_v3 = stats->rx;
 739 
 740                 mvm->radio_stats.rx_time =
 741                         le64_to_cpu(stats->general.common.rx_time);
 742                 mvm->radio_stats.tx_time =
 743                         le64_to_cpu(stats->general.common.tx_time);
 744                 mvm->radio_stats.on_time_rf =
 745                         le64_to_cpu(stats->general.common.on_time_rf);
 746                 mvm->radio_stats.on_time_scan =
 747                         le64_to_cpu(stats->general.common.on_time_scan);
 748 
 749                 data.general = &stats->general;
 750 
 751                 flags = stats->flag;
 752         } else {
 753                 struct iwl_notif_statistics *stats = (void *)&pkt->data;
 754 
 755                 data.mac_id = stats->rx.general.mac_id;
 756                 data.beacon_filter_average_energy =
 757                         stats->general.common.beacon_filter_average_energy;
 758 
 759                 mvm->rx_stats = stats->rx;
 760 
 761                 mvm->radio_stats.rx_time =
 762                         le64_to_cpu(stats->general.common.rx_time);
 763                 mvm->radio_stats.tx_time =
 764                         le64_to_cpu(stats->general.common.tx_time);
 765                 mvm->radio_stats.on_time_rf =
 766                         le64_to_cpu(stats->general.common.on_time_rf);
 767                 mvm->radio_stats.on_time_scan =
 768                         le64_to_cpu(stats->general.common.on_time_scan);
 769 
 770                 data.general = &stats->general;
 771 
 772                 flags = stats->flag;
 773         }
 774         data.flags = flags;
 775 
 776         iwl_mvm_rx_stats_check_trigger(mvm, pkt);
 777 
 778         ieee80211_iterate_active_interfaces(mvm->hw,
 779                                             IEEE80211_IFACE_ITER_NORMAL,
 780                                             iwl_mvm_stat_iterator,
 781                                             &data);
 782 
 783         if (!iwl_mvm_has_new_rx_api(mvm))
 784                 return;
 785 
 786         if (!iwl_mvm_has_new_rx_stats_api(mvm)) {
 787                 struct iwl_notif_statistics_v11 *v11 = (void *)&pkt->data;
 788 
 789                 energy = (void *)&v11->load_stats.avg_energy;
 790                 bytes = (void *)&v11->load_stats.byte_count;
 791                 air_time = (void *)&v11->load_stats.air_time;
 792         } else {
 793                 struct iwl_notif_statistics *stats = (void *)&pkt->data;
 794 
 795                 energy = (void *)&stats->load_stats.avg_energy;
 796                 bytes = (void *)&stats->load_stats.byte_count;
 797                 air_time = (void *)&stats->load_stats.air_time;
 798         }
 799 
 800         rcu_read_lock();
 801         for (i = 0; i < ARRAY_SIZE(mvm->fw_id_to_mac_id); i++) {
 802                 struct iwl_mvm_sta *sta;
 803 
 804                 if (!energy[i])
 805                         continue;
 806 
 807                 sta = iwl_mvm_sta_from_staid_rcu(mvm, i);
 808                 if (!sta)
 809                         continue;
 810                 sta->avg_energy = energy[i];
 811         }
 812         rcu_read_unlock();
 813 
 814         /*
 815          * Don't update in case the statistics are not cleared, since
 816          * we will end up counting twice the same airtime, once in TCM
 817          * request and once in statistics notification.
 818          */
 819         if (!(le32_to_cpu(flags) & IWL_STATISTICS_REPLY_FLG_CLEAR))
 820                 return;
 821 
 822         spin_lock(&mvm->tcm.lock);
 823         for (i = 0; i < NUM_MAC_INDEX_DRIVER; i++) {
 824                 struct iwl_mvm_tcm_mac *mdata = &mvm->tcm.data[i];
 825                 u32 airtime = le32_to_cpu(air_time[i]);
 826                 u32 rx_bytes = le32_to_cpu(bytes[i]);
 827 
 828                 mdata->uapsd_nonagg_detect.rx_bytes += rx_bytes;
 829                 if (airtime) {
 830                         /* re-init every time to store rate from FW */
 831                         ewma_rate_init(&mdata->uapsd_nonagg_detect.rate);
 832                         ewma_rate_add(&mdata->uapsd_nonagg_detect.rate,
 833                                       rx_bytes * 8 / airtime);
 834                 }
 835 
 836                 mdata->rx.airtime += airtime;
 837         }
 838         spin_unlock(&mvm->tcm.lock);
 839 }
 840 
 841 void iwl_mvm_rx_statistics(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
 842 {
 843         iwl_mvm_handle_rx_statistics(mvm, rxb_addr(rxb));
 844 }
 845 
 846 void iwl_mvm_window_status_notif(struct iwl_mvm *mvm,
 847                                  struct iwl_rx_cmd_buffer *rxb)
 848 {
 849         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 850         struct iwl_ba_window_status_notif *notif = (void *)pkt->data;
 851         int i;
 852         u32 pkt_len = iwl_rx_packet_payload_len(pkt);
 853 
 854         if (WARN_ONCE(pkt_len != sizeof(*notif),
 855                       "Received window status notification of wrong size (%u)\n",
 856                       pkt_len))
 857                 return;
 858 
 859         rcu_read_lock();
 860         for (i = 0; i < BA_WINDOW_STREAMS_MAX; i++) {
 861                 struct ieee80211_sta *sta;
 862                 u8 sta_id, tid;
 863                 u64 bitmap;
 864                 u32 ssn;
 865                 u16 ratid;
 866                 u16 received_mpdu;
 867 
 868                 ratid = le16_to_cpu(notif->ra_tid[i]);
 869                 /* check that this TID is valid */
 870                 if (!(ratid & BA_WINDOW_STATUS_VALID_MSK))
 871                         continue;
 872 
 873                 received_mpdu = le16_to_cpu(notif->mpdu_rx_count[i]);
 874                 if (received_mpdu == 0)
 875                         continue;
 876 
 877                 tid = ratid & BA_WINDOW_STATUS_TID_MSK;
 878                 /* get the station */
 879                 sta_id = (ratid & BA_WINDOW_STATUS_STA_ID_MSK)
 880                          >> BA_WINDOW_STATUS_STA_ID_POS;
 881                 sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
 882                 if (IS_ERR_OR_NULL(sta))
 883                         continue;
 884                 bitmap = le64_to_cpu(notif->bitmap[i]);
 885                 ssn = le32_to_cpu(notif->start_seq_num[i]);
 886 
 887                 /* update mac80211 with the bitmap for the reordering buffer */
 888                 ieee80211_mark_rx_ba_filtered_frames(sta, tid, ssn, bitmap,
 889                                                      received_mpdu);
 890         }
 891         rcu_read_unlock();
 892 }
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/net/wireless/intel/iwlwifi/mvm/rx.c

DEFINITIONS
