linux/drivers/net/wireless/intel/iwlwifi/mvm/rx.c
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   1/******************************************************************************
   2 *
   3 * This file is provided under a dual BSD/GPLv2 license.  When using or
   4 * redistributing this file, you may do so under either license.
   5 *
   6 * GPL LICENSE SUMMARY
   7 *
   8 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
   9 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
  10 * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
  11 *
  12 * This program is free software; you can redistribute it and/or modify
  13 * it under the terms of version 2 of the GNU General Public License as
  14 * published by the Free Software Foundation.
  15 *
  16 * This program is distributed in the hope that it will be useful, but
  17 * WITHOUT ANY WARRANTY; without even the implied warranty of
  18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19 * General Public License for more details.
  20 *
  21 * The full GNU General Public License is included in this distribution
  22 * in the file called COPYING.
  23 *
  24 * Contact Information:
  25 *  Intel Linux Wireless <linuxwifi@intel.com>
  26 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  27 *
  28 * BSD LICENSE
  29 *
  30 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  31 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
  32 * All rights reserved.
  33 *
  34 * Redistribution and use in source and binary forms, with or without
  35 * modification, are permitted provided that the following conditions
  36 * are met:
  37 *
  38 *  * Redistributions of source code must retain the above copyright
  39 *    notice, this list of conditions and the following disclaimer.
  40 *  * Redistributions in binary form must reproduce the above copyright
  41 *    notice, this list of conditions and the following disclaimer in
  42 *    the documentation and/or other materials provided with the
  43 *    distribution.
  44 *  * Neither the name Intel Corporation nor the names of its
  45 *    contributors may be used to endorse or promote products derived
  46 *    from this software without specific prior written permission.
  47 *
  48 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  49 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  50 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  51 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  52 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  53 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  54 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  55 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  56 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  57 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  58 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  59 *****************************************************************************/
  60#include <linux/etherdevice.h>
  61#include <linux/skbuff.h>
  62#include "iwl-trans.h"
  63#include "mvm.h"
  64#include "fw-api.h"
  65
  66/*
  67 * iwl_mvm_rx_rx_phy_cmd - REPLY_RX_PHY_CMD handler
  68 *
  69 * Copies the phy information in mvm->last_phy_info, it will be used when the
  70 * actual data will come from the fw in the next packet.
  71 */
  72void iwl_mvm_rx_rx_phy_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
  73{
  74        struct iwl_rx_packet *pkt = rxb_addr(rxb);
  75
  76        memcpy(&mvm->last_phy_info, pkt->data, sizeof(mvm->last_phy_info));
  77        mvm->ampdu_ref++;
  78
  79#ifdef CONFIG_IWLWIFI_DEBUGFS
  80        if (mvm->last_phy_info.phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
  81                spin_lock(&mvm->drv_stats_lock);
  82                mvm->drv_rx_stats.ampdu_count++;
  83                spin_unlock(&mvm->drv_stats_lock);
  84        }
  85#endif
  86}
  87
  88/*
  89 * iwl_mvm_pass_packet_to_mac80211 - builds the packet for mac80211
  90 *
  91 * Adds the rxb to a new skb and give it to mac80211
  92 */
  93static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm,
  94                                            struct ieee80211_sta *sta,
  95                                            struct napi_struct *napi,
  96                                            struct sk_buff *skb,
  97                                            struct ieee80211_hdr *hdr, u16 len,
  98                                            u8 crypt_len,
  99                                            struct iwl_rx_cmd_buffer *rxb)
 100{
 101        unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
 102        unsigned int fraglen;
 103
 104        /*
 105         * The 'hdrlen' (plus the 8 bytes for the SNAP and the crypt_len,
 106         * but those are all multiples of 4 long) all goes away, but we
 107         * want the *end* of it, which is going to be the start of the IP
 108         * header, to be aligned when it gets pulled in.
 109         * The beginning of the skb->data is aligned on at least a 4-byte
 110         * boundary after allocation. Everything here is aligned at least
 111         * on a 2-byte boundary so we can just take hdrlen & 3 and pad by
 112         * the result.
 113         */
 114        skb_reserve(skb, hdrlen & 3);
 115
 116        /* If frame is small enough to fit in skb->head, pull it completely.
 117         * If not, only pull ieee80211_hdr (including crypto if present, and
 118         * an additional 8 bytes for SNAP/ethertype, see below) so that
 119         * splice() or TCP coalesce are more efficient.
 120         *
 121         * Since, in addition, ieee80211_data_to_8023() always pull in at
 122         * least 8 bytes (possibly more for mesh) we can do the same here
 123         * to save the cost of doing it later. That still doesn't pull in
 124         * the actual IP header since the typical case has a SNAP header.
 125         * If the latter changes (there are efforts in the standards group
 126         * to do so) we should revisit this and ieee80211_data_to_8023().
 127         */
 128        hdrlen = (len <= skb_tailroom(skb)) ? len : hdrlen + crypt_len + 8;
 129
 130        skb_put_data(skb, hdr, hdrlen);
 131        fraglen = len - hdrlen;
 132
 133        if (fraglen) {
 134                int offset = (void *)hdr + hdrlen -
 135                             rxb_addr(rxb) + rxb_offset(rxb);
 136
 137                skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
 138                                fraglen, rxb->truesize);
 139        }
 140
 141        ieee80211_rx_napi(mvm->hw, sta, skb, napi);
 142}
 143
 144/*
 145 * iwl_mvm_get_signal_strength - use new rx PHY INFO API
 146 * values are reported by the fw as positive values - need to negate
 147 * to obtain their dBM.  Account for missing antennas by replacing 0
 148 * values by -256dBm: practically 0 power and a non-feasible 8 bit value.
 149 */
 150static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm,
 151                                        struct iwl_rx_phy_info *phy_info,
 152                                        struct ieee80211_rx_status *rx_status)
 153{
 154        int energy_a, energy_b, energy_c, max_energy;
 155        u32 val;
 156
 157        val =
 158            le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_ENERGY_ANT_ABC_IDX]);
 159        energy_a = (val & IWL_RX_INFO_ENERGY_ANT_A_MSK) >>
 160                                                IWL_RX_INFO_ENERGY_ANT_A_POS;
 161        energy_a = energy_a ? -energy_a : S8_MIN;
 162        energy_b = (val & IWL_RX_INFO_ENERGY_ANT_B_MSK) >>
 163                                                IWL_RX_INFO_ENERGY_ANT_B_POS;
 164        energy_b = energy_b ? -energy_b : S8_MIN;
 165        energy_c = (val & IWL_RX_INFO_ENERGY_ANT_C_MSK) >>
 166                                                IWL_RX_INFO_ENERGY_ANT_C_POS;
 167        energy_c = energy_c ? -energy_c : S8_MIN;
 168        max_energy = max(energy_a, energy_b);
 169        max_energy = max(max_energy, energy_c);
 170
 171        IWL_DEBUG_STATS(mvm, "energy In A %d B %d C %d , and max %d\n",
 172                        energy_a, energy_b, energy_c, max_energy);
 173
 174        rx_status->signal = max_energy;
 175        rx_status->chains = (le16_to_cpu(phy_info->phy_flags) &
 176                                RX_RES_PHY_FLAGS_ANTENNA)
 177                                        >> RX_RES_PHY_FLAGS_ANTENNA_POS;
 178        rx_status->chain_signal[0] = energy_a;
 179        rx_status->chain_signal[1] = energy_b;
 180        rx_status->chain_signal[2] = energy_c;
 181}
 182
 183/*
 184 * iwl_mvm_set_mac80211_rx_flag - translate fw status to mac80211 format
 185 * @mvm: the mvm object
 186 * @hdr: 80211 header
 187 * @stats: status in mac80211's format
 188 * @rx_pkt_status: status coming from fw
 189 *
 190 * returns non 0 value if the packet should be dropped
 191 */
 192static u32 iwl_mvm_set_mac80211_rx_flag(struct iwl_mvm *mvm,
 193                                        struct ieee80211_hdr *hdr,
 194                                        struct ieee80211_rx_status *stats,
 195                                        u32 rx_pkt_status,
 196                                        u8 *crypt_len)
 197{
 198        if (!ieee80211_has_protected(hdr->frame_control) ||
 199            (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 200                             RX_MPDU_RES_STATUS_SEC_NO_ENC)
 201                return 0;
 202
 203        /* packet was encrypted with unknown alg */
 204        if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 205                                        RX_MPDU_RES_STATUS_SEC_ENC_ERR)
 206                return 0;
 207
 208        switch (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) {
 209        case RX_MPDU_RES_STATUS_SEC_CCM_ENC:
 210                /* alg is CCM: check MIC only */
 211                if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
 212                        return -1;
 213
 214                stats->flag |= RX_FLAG_DECRYPTED;
 215                *crypt_len = IEEE80211_CCMP_HDR_LEN;
 216                return 0;
 217
 218        case RX_MPDU_RES_STATUS_SEC_TKIP_ENC:
 219                /* Don't drop the frame and decrypt it in SW */
 220                if (!fw_has_api(&mvm->fw->ucode_capa,
 221                                IWL_UCODE_TLV_API_DEPRECATE_TTAK) &&
 222                    !(rx_pkt_status & RX_MPDU_RES_STATUS_TTAK_OK))
 223                        return 0;
 224                *crypt_len = IEEE80211_TKIP_IV_LEN;
 225                /* fall through */
 226
 227        case RX_MPDU_RES_STATUS_SEC_WEP_ENC:
 228                if (!(rx_pkt_status & RX_MPDU_RES_STATUS_ICV_OK))
 229                        return -1;
 230
 231                stats->flag |= RX_FLAG_DECRYPTED;
 232                if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
 233                                RX_MPDU_RES_STATUS_SEC_WEP_ENC)
 234                        *crypt_len = IEEE80211_WEP_IV_LEN;
 235                return 0;
 236
 237        case RX_MPDU_RES_STATUS_SEC_EXT_ENC:
 238                if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
 239                        return -1;
 240                stats->flag |= RX_FLAG_DECRYPTED;
 241                return 0;
 242
 243        default:
 244                /* Expected in monitor (not having the keys) */
 245                if (!mvm->monitor_on)
 246                        IWL_ERR(mvm, "Unhandled alg: 0x%x\n", rx_pkt_status);
 247        }
 248
 249        return 0;
 250}
 251
 252static void iwl_mvm_rx_handle_tcm(struct iwl_mvm *mvm,
 253                                  struct ieee80211_sta *sta,
 254                                  struct ieee80211_hdr *hdr, u32 len,
 255                                  struct iwl_rx_phy_info *phy_info,
 256                                  u32 rate_n_flags)
 257{
 258        struct iwl_mvm_sta *mvmsta;
 259        struct iwl_mvm_tcm_mac *mdata;
 260        int mac;
 261        int ac = IEEE80211_AC_BE; /* treat non-QoS as BE */
 262        struct iwl_mvm_vif *mvmvif;
 263        /* expected throughput in 100Kbps, single stream, 20 MHz */
 264        static const u8 thresh_tpt[] = {
 265                9, 18, 30, 42, 60, 78, 90, 96, 120, 135,
 266        };
 267        u16 thr;
 268
 269        if (ieee80211_is_data_qos(hdr->frame_control))
 270                ac = tid_to_mac80211_ac[ieee80211_get_tid(hdr)];
 271
 272        mvmsta = iwl_mvm_sta_from_mac80211(sta);
 273        mac = mvmsta->mac_id_n_color & FW_CTXT_ID_MSK;
 274
 275        if (time_after(jiffies, mvm->tcm.ts + MVM_TCM_PERIOD))
 276                schedule_delayed_work(&mvm->tcm.work, 0);
 277        mdata = &mvm->tcm.data[mac];
 278        mdata->rx.pkts[ac]++;
 279
 280        /* count the airtime only once for each ampdu */
 281        if (mdata->rx.last_ampdu_ref != mvm->ampdu_ref) {
 282                mdata->rx.last_ampdu_ref = mvm->ampdu_ref;
 283                mdata->rx.airtime += le16_to_cpu(phy_info->frame_time);
 284        }
 285
 286        if (!(rate_n_flags & (RATE_MCS_HT_MSK | RATE_MCS_VHT_MSK)))
 287                return;
 288
 289        mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
 290
 291        if (mdata->opened_rx_ba_sessions ||
 292            mdata->uapsd_nonagg_detect.detected ||
 293            (!mvmvif->queue_params[IEEE80211_AC_VO].uapsd &&
 294             !mvmvif->queue_params[IEEE80211_AC_VI].uapsd &&
 295             !mvmvif->queue_params[IEEE80211_AC_BE].uapsd &&
 296             !mvmvif->queue_params[IEEE80211_AC_BK].uapsd) ||
 297            mvmsta->sta_id != mvmvif->ap_sta_id)
 298                return;
 299
 300        if (rate_n_flags & RATE_MCS_HT_MSK) {
 301                thr = thresh_tpt[rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK];
 302                thr *= 1 + ((rate_n_flags & RATE_HT_MCS_NSS_MSK) >>
 303                                        RATE_HT_MCS_NSS_POS);
 304        } else {
 305                if (WARN_ON((rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK) >=
 306                                ARRAY_SIZE(thresh_tpt)))
 307                        return;
 308                thr = thresh_tpt[rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK];
 309                thr *= 1 + ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
 310                                        RATE_VHT_MCS_NSS_POS);
 311        }
 312
 313        thr <<= ((rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) >>
 314                                RATE_MCS_CHAN_WIDTH_POS);
 315
 316        mdata->uapsd_nonagg_detect.rx_bytes += len;
 317        ewma_rate_add(&mdata->uapsd_nonagg_detect.rate, thr);
 318}
 319
 320static void iwl_mvm_rx_csum(struct ieee80211_sta *sta,
 321                            struct sk_buff *skb,
 322                            u32 status)
 323{
 324        struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 325        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
 326
 327        if (mvmvif->features & NETIF_F_RXCSUM &&
 328            status & RX_MPDU_RES_STATUS_CSUM_DONE &&
 329            status & RX_MPDU_RES_STATUS_CSUM_OK)
 330                skb->ip_summed = CHECKSUM_UNNECESSARY;
 331}
 332
 333/*
 334 * iwl_mvm_rx_rx_mpdu - REPLY_RX_MPDU_CMD handler
 335 *
 336 * Handles the actual data of the Rx packet from the fw
 337 */
 338void iwl_mvm_rx_rx_mpdu(struct iwl_mvm *mvm, struct napi_struct *napi,
 339                        struct iwl_rx_cmd_buffer *rxb)
 340{
 341        struct ieee80211_hdr *hdr;
 342        struct ieee80211_rx_status *rx_status;
 343        struct iwl_rx_packet *pkt = rxb_addr(rxb);
 344        struct iwl_rx_phy_info *phy_info;
 345        struct iwl_rx_mpdu_res_start *rx_res;
 346        struct ieee80211_sta *sta = NULL;
 347        struct sk_buff *skb;
 348        u32 len;
 349        u32 rate_n_flags;
 350        u32 rx_pkt_status;
 351        u8 crypt_len = 0;
 352        bool take_ref;
 353
 354        phy_info = &mvm->last_phy_info;
 355        rx_res = (struct iwl_rx_mpdu_res_start *)pkt->data;
 356        hdr = (struct ieee80211_hdr *)(pkt->data + sizeof(*rx_res));
 357        len = le16_to_cpu(rx_res->byte_count);
 358        rx_pkt_status = le32_to_cpup((__le32 *)
 359                (pkt->data + sizeof(*rx_res) + len));
 360
 361        /* Dont use dev_alloc_skb(), we'll have enough headroom once
 362         * ieee80211_hdr pulled.
 363         */
 364        skb = alloc_skb(128, GFP_ATOMIC);
 365        if (!skb) {
 366                IWL_ERR(mvm, "alloc_skb failed\n");
 367                return;
 368        }
 369
 370        rx_status = IEEE80211_SKB_RXCB(skb);
 371
 372        /*
 373         * drop the packet if it has failed being decrypted by HW
 374         */
 375        if (iwl_mvm_set_mac80211_rx_flag(mvm, hdr, rx_status, rx_pkt_status,
 376                                         &crypt_len)) {
 377                IWL_DEBUG_DROP(mvm, "Bad decryption results 0x%08x\n",
 378                               rx_pkt_status);
 379                kfree_skb(skb);
 380                return;
 381        }
 382
 383        /*
 384         * Keep packets with CRC errors (and with overrun) for monitor mode
 385         * (otherwise the firmware discards them) but mark them as bad.
 386         */
 387        if (!(rx_pkt_status & RX_MPDU_RES_STATUS_CRC_OK) ||
 388            !(rx_pkt_status & RX_MPDU_RES_STATUS_OVERRUN_OK)) {
 389                IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n", rx_pkt_status);
 390                rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
 391        }
 392
 393        /* This will be used in several places later */
 394        rate_n_flags = le32_to_cpu(phy_info->rate_n_flags);
 395
 396        /* rx_status carries information about the packet to mac80211 */
 397        rx_status->mactime = le64_to_cpu(phy_info->timestamp);
 398        rx_status->device_timestamp = le32_to_cpu(phy_info->system_timestamp);
 399        rx_status->band =
 400                (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_BAND_24)) ?
 401                                NL80211_BAND_2GHZ : NL80211_BAND_5GHZ;
 402        rx_status->freq =
 403                ieee80211_channel_to_frequency(le16_to_cpu(phy_info->channel),
 404                                               rx_status->band);
 405
 406        /* TSF as indicated by the firmware  is at INA time */
 407        rx_status->flag |= RX_FLAG_MACTIME_PLCP_START;
 408
 409        iwl_mvm_get_signal_strength(mvm, phy_info, rx_status);
 410
 411        IWL_DEBUG_STATS_LIMIT(mvm, "Rssi %d, TSF %llu\n", rx_status->signal,
 412                              (unsigned long long)rx_status->mactime);
 413
 414        rcu_read_lock();
 415        if (rx_pkt_status & RX_MPDU_RES_STATUS_SRC_STA_FOUND) {
 416                u32 id = rx_pkt_status & RX_MPDU_RES_STATUS_STA_ID_MSK;
 417
 418                id >>= RX_MDPU_RES_STATUS_STA_ID_SHIFT;
 419
 420                if (!WARN_ON_ONCE(id >= ARRAY_SIZE(mvm->fw_id_to_mac_id))) {
 421                        sta = rcu_dereference(mvm->fw_id_to_mac_id[id]);
 422                        if (IS_ERR(sta))
 423                                sta = NULL;
 424                }
 425        } else if (!is_multicast_ether_addr(hdr->addr2)) {
 426                /* This is fine since we prevent two stations with the same
 427                 * address from being added.
 428                 */
 429                sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL);
 430        }
 431
 432        if (sta) {
 433                struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 434                struct ieee80211_vif *tx_blocked_vif =
 435                        rcu_dereference(mvm->csa_tx_blocked_vif);
 436                struct iwl_fw_dbg_trigger_tlv *trig;
 437                struct ieee80211_vif *vif = mvmsta->vif;
 438
 439                /* We have tx blocked stations (with CS bit). If we heard
 440                 * frames from a blocked station on a new channel we can
 441                 * TX to it again.
 442                 */
 443                if (unlikely(tx_blocked_vif) && vif == tx_blocked_vif) {
 444                        struct iwl_mvm_vif *mvmvif =
 445                                iwl_mvm_vif_from_mac80211(tx_blocked_vif);
 446
 447                        if (mvmvif->csa_target_freq == rx_status->freq)
 448                                iwl_mvm_sta_modify_disable_tx_ap(mvm, sta,
 449                                                                 false);
 450                }
 451
 452                rs_update_last_rssi(mvm, mvmsta, rx_status);
 453
 454                trig = iwl_fw_dbg_trigger_on(&mvm->fwrt,
 455                                             ieee80211_vif_to_wdev(vif),
 456                                             FW_DBG_TRIGGER_RSSI);
 457
 458                if (trig && ieee80211_is_beacon(hdr->frame_control)) {
 459                        struct iwl_fw_dbg_trigger_low_rssi *rssi_trig;
 460                        s32 rssi;
 461
 462                        rssi_trig = (void *)trig->data;
 463                        rssi = le32_to_cpu(rssi_trig->rssi);
 464
 465                        if (rx_status->signal < rssi)
 466                                iwl_fw_dbg_collect_trig(&mvm->fwrt, trig,
 467                                                        NULL);
 468                }
 469
 470                if (!mvm->tcm.paused && len >= sizeof(*hdr) &&
 471                    !is_multicast_ether_addr(hdr->addr1) &&
 472                    ieee80211_is_data(hdr->frame_control))
 473                        iwl_mvm_rx_handle_tcm(mvm, sta, hdr, len, phy_info,
 474                                              rate_n_flags);
 475
 476                if (ieee80211_is_data(hdr->frame_control))
 477                        iwl_mvm_rx_csum(sta, skb, rx_pkt_status);
 478        }
 479        rcu_read_unlock();
 480
 481        /* set the preamble flag if appropriate */
 482        if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_SHORT_PREAMBLE))
 483                rx_status->enc_flags |= RX_ENC_FLAG_SHORTPRE;
 484
 485        if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
 486                /*
 487                 * We know which subframes of an A-MPDU belong
 488                 * together since we get a single PHY response
 489                 * from the firmware for all of them
 490                 */
 491                rx_status->flag |= RX_FLAG_AMPDU_DETAILS;
 492                rx_status->ampdu_reference = mvm->ampdu_ref;
 493        }
 494
 495        /* Set up the HT phy flags */
 496        switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
 497        case RATE_MCS_CHAN_WIDTH_20:
 498                break;
 499        case RATE_MCS_CHAN_WIDTH_40:
 500                rx_status->bw = RATE_INFO_BW_40;
 501                break;
 502        case RATE_MCS_CHAN_WIDTH_80:
 503                rx_status->bw = RATE_INFO_BW_80;
 504                break;
 505        case RATE_MCS_CHAN_WIDTH_160:
 506                rx_status->bw = RATE_INFO_BW_160;
 507                break;
 508        }
 509        if (!(rate_n_flags & RATE_MCS_CCK_MSK) &&
 510            rate_n_flags & RATE_MCS_SGI_MSK)
 511                rx_status->enc_flags |= RX_ENC_FLAG_SHORT_GI;
 512        if (rate_n_flags & RATE_HT_MCS_GF_MSK)
 513                rx_status->enc_flags |= RX_ENC_FLAG_HT_GF;
 514        if (rate_n_flags & RATE_MCS_LDPC_MSK)
 515                rx_status->enc_flags |= RX_ENC_FLAG_LDPC;
 516        if (rate_n_flags & RATE_MCS_HT_MSK) {
 517                u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >>
 518                                RATE_MCS_STBC_POS;
 519                rx_status->encoding = RX_ENC_HT;
 520                rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
 521                rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT;
 522        } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 523                u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >>
 524                                RATE_MCS_STBC_POS;
 525                rx_status->nss =
 526                        ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
 527                                                RATE_VHT_MCS_NSS_POS) + 1;
 528                rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 529                rx_status->encoding = RX_ENC_VHT;
 530                rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT;
 531                if (rate_n_flags & RATE_MCS_BF_MSK)
 532                        rx_status->enc_flags |= RX_ENC_FLAG_BF;
 533        } else {
 534                int rate = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
 535                                                               rx_status->band);
 536
 537                if (WARN(rate < 0 || rate > 0xFF,
 538                         "Invalid rate flags 0x%x, band %d,\n",
 539                         rate_n_flags, rx_status->band)) {
 540                        kfree_skb(skb);
 541                        return;
 542                }
 543                rx_status->rate_idx = rate;
 544        }
 545
 546#ifdef CONFIG_IWLWIFI_DEBUGFS
 547        iwl_mvm_update_frame_stats(mvm, rate_n_flags,
 548                                   rx_status->flag & RX_FLAG_AMPDU_DETAILS);
 549#endif
 550
 551        if (unlikely((ieee80211_is_beacon(hdr->frame_control) ||
 552                      ieee80211_is_probe_resp(hdr->frame_control)) &&
 553                     mvm->sched_scan_pass_all == SCHED_SCAN_PASS_ALL_ENABLED))
 554                mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_FOUND;
 555
 556        if (unlikely(ieee80211_is_beacon(hdr->frame_control) ||
 557                     ieee80211_is_probe_resp(hdr->frame_control)))
 558                rx_status->boottime_ns = ktime_get_boot_ns();
 559
 560        /* Take a reference briefly to kick off a d0i3 entry delay so
 561         * we can handle bursts of RX packets without toggling the
 562         * state too often.  But don't do this for beacons if we are
 563         * going to idle because the beacon filtering changes we make
 564         * cause the firmware to send us collateral beacons. */
 565        take_ref = !(test_bit(STATUS_TRANS_GOING_IDLE, &mvm->trans->status) &&
 566                     ieee80211_is_beacon(hdr->frame_control));
 567
 568        if (take_ref)
 569                iwl_mvm_ref(mvm, IWL_MVM_REF_RX);
 570
 571        iwl_mvm_pass_packet_to_mac80211(mvm, sta, napi, skb, hdr, len,
 572                                        crypt_len, rxb);
 573
 574        if (take_ref)
 575                iwl_mvm_unref(mvm, IWL_MVM_REF_RX);
 576}
 577
 578struct iwl_mvm_stat_data {
 579        struct iwl_mvm *mvm;
 580        __le32 mac_id;
 581        u8 beacon_filter_average_energy;
 582        void *general;
 583};
 584
 585static void iwl_mvm_stat_iterator(void *_data, u8 *mac,
 586                                  struct ieee80211_vif *vif)
 587{
 588        struct iwl_mvm_stat_data *data = _data;
 589        struct iwl_mvm *mvm = data->mvm;
 590        int sig = -data->beacon_filter_average_energy;
 591        int last_event;
 592        int thold = vif->bss_conf.cqm_rssi_thold;
 593        int hyst = vif->bss_conf.cqm_rssi_hyst;
 594        u16 id = le32_to_cpu(data->mac_id);
 595        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 596        u16 vif_id = mvmvif->id;
 597
 598        /* This doesn't need the MAC ID check since it's not taking the
 599         * data copied into the "data" struct, but rather the data from
 600         * the notification directly.
 601         */
 602        if (iwl_mvm_has_new_rx_stats_api(mvm)) {
 603                struct mvm_statistics_general *general =
 604                        data->general;
 605
 606                mvmvif->beacon_stats.num_beacons =
 607                        le32_to_cpu(general->beacon_counter[vif_id]);
 608                mvmvif->beacon_stats.avg_signal =
 609                        -general->beacon_average_energy[vif_id];
 610        } else {
 611                struct mvm_statistics_general_v8 *general =
 612                        data->general;
 613
 614                mvmvif->beacon_stats.num_beacons =
 615                        le32_to_cpu(general->beacon_counter[vif_id]);
 616                mvmvif->beacon_stats.avg_signal =
 617                        -general->beacon_average_energy[vif_id];
 618        }
 619
 620        if (mvmvif->id != id)
 621                return;
 622
 623        if (vif->type != NL80211_IFTYPE_STATION)
 624                return;
 625
 626        if (sig == 0) {
 627                IWL_DEBUG_RX(mvm, "RSSI is 0 - skip signal based decision\n");
 628                return;
 629        }
 630
 631        mvmvif->bf_data.ave_beacon_signal = sig;
 632
 633        /* BT Coex */
 634        if (mvmvif->bf_data.bt_coex_min_thold !=
 635            mvmvif->bf_data.bt_coex_max_thold) {
 636                last_event = mvmvif->bf_data.last_bt_coex_event;
 637                if (sig > mvmvif->bf_data.bt_coex_max_thold &&
 638                    (last_event <= mvmvif->bf_data.bt_coex_min_thold ||
 639                     last_event == 0)) {
 640                        mvmvif->bf_data.last_bt_coex_event = sig;
 641                        IWL_DEBUG_RX(mvm, "cqm_iterator bt coex high %d\n",
 642                                     sig);
 643                        iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_HIGH);
 644                } else if (sig < mvmvif->bf_data.bt_coex_min_thold &&
 645                           (last_event >= mvmvif->bf_data.bt_coex_max_thold ||
 646                            last_event == 0)) {
 647                        mvmvif->bf_data.last_bt_coex_event = sig;
 648                        IWL_DEBUG_RX(mvm, "cqm_iterator bt coex low %d\n",
 649                                     sig);
 650                        iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_LOW);
 651                }
 652        }
 653
 654        if (!(vif->driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI))
 655                return;
 656
 657        /* CQM Notification */
 658        last_event = mvmvif->bf_data.last_cqm_event;
 659        if (thold && sig < thold && (last_event == 0 ||
 660                                     sig < last_event - hyst)) {
 661                mvmvif->bf_data.last_cqm_event = sig;
 662                IWL_DEBUG_RX(mvm, "cqm_iterator cqm low %d\n",
 663                             sig);
 664                ieee80211_cqm_rssi_notify(
 665                        vif,
 666                        NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
 667                        sig,
 668                        GFP_KERNEL);
 669        } else if (sig > thold &&
 670                   (last_event == 0 || sig > last_event + hyst)) {
 671                mvmvif->bf_data.last_cqm_event = sig;
 672                IWL_DEBUG_RX(mvm, "cqm_iterator cqm high %d\n",
 673                             sig);
 674                ieee80211_cqm_rssi_notify(
 675                        vif,
 676                        NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
 677                        sig,
 678                        GFP_KERNEL);
 679        }
 680}
 681
 682static inline void
 683iwl_mvm_rx_stats_check_trigger(struct iwl_mvm *mvm, struct iwl_rx_packet *pkt)
 684{
 685        struct iwl_fw_dbg_trigger_tlv *trig;
 686        struct iwl_fw_dbg_trigger_stats *trig_stats;
 687        u32 trig_offset, trig_thold;
 688
 689        trig = iwl_fw_dbg_trigger_on(&mvm->fwrt, NULL, FW_DBG_TRIGGER_STATS);
 690        if (!trig)
 691                return;
 692
 693        trig_stats = (void *)trig->data;
 694
 695        trig_offset = le32_to_cpu(trig_stats->stop_offset);
 696        trig_thold = le32_to_cpu(trig_stats->stop_threshold);
 697
 698        if (WARN_ON_ONCE(trig_offset >= iwl_rx_packet_payload_len(pkt)))
 699                return;
 700
 701        if (le32_to_cpup((__le32 *) (pkt->data + trig_offset)) < trig_thold)
 702                return;
 703
 704        iwl_fw_dbg_collect_trig(&mvm->fwrt, trig, NULL);
 705}
 706
 707void iwl_mvm_handle_rx_statistics(struct iwl_mvm *mvm,
 708                                  struct iwl_rx_packet *pkt)
 709{
 710        struct iwl_mvm_stat_data data = {
 711                .mvm = mvm,
 712        };
 713        int expected_size;
 714        int i;
 715        u8 *energy;
 716        __le32 *bytes;
 717        __le32 *air_time;
 718        __le32 flags;
 719
 720        if (!iwl_mvm_has_new_rx_stats_api(mvm)) {
 721                if (iwl_mvm_has_new_rx_api(mvm))
 722                        expected_size = sizeof(struct iwl_notif_statistics_v11);
 723                else
 724                        expected_size = sizeof(struct iwl_notif_statistics_v10);
 725        } else {
 726                expected_size = sizeof(struct iwl_notif_statistics);
 727        }
 728
 729        if (WARN_ONCE(iwl_rx_packet_payload_len(pkt) != expected_size,
 730                      "received invalid statistics size (%d)!\n",
 731                      iwl_rx_packet_payload_len(pkt)))
 732                return;
 733
 734        if (!iwl_mvm_has_new_rx_stats_api(mvm)) {
 735                struct iwl_notif_statistics_v11 *stats = (void *)&pkt->data;
 736
 737                data.mac_id = stats->rx.general.mac_id;
 738                data.beacon_filter_average_energy =
 739                        stats->general.common.beacon_filter_average_energy;
 740
 741                mvm->rx_stats_v3 = stats->rx;
 742
 743                mvm->radio_stats.rx_time =
 744                        le64_to_cpu(stats->general.common.rx_time);
 745                mvm->radio_stats.tx_time =
 746                        le64_to_cpu(stats->general.common.tx_time);
 747                mvm->radio_stats.on_time_rf =
 748                        le64_to_cpu(stats->general.common.on_time_rf);
 749                mvm->radio_stats.on_time_scan =
 750                        le64_to_cpu(stats->general.common.on_time_scan);
 751
 752                data.general = &stats->general;
 753
 754                flags = stats->flag;
 755        } else {
 756                struct iwl_notif_statistics *stats = (void *)&pkt->data;
 757
 758                data.mac_id = stats->rx.general.mac_id;
 759                data.beacon_filter_average_energy =
 760                        stats->general.common.beacon_filter_average_energy;
 761
 762                mvm->rx_stats = stats->rx;
 763
 764                mvm->radio_stats.rx_time =
 765                        le64_to_cpu(stats->general.common.rx_time);
 766                mvm->radio_stats.tx_time =
 767                        le64_to_cpu(stats->general.common.tx_time);
 768                mvm->radio_stats.on_time_rf =
 769                        le64_to_cpu(stats->general.common.on_time_rf);
 770                mvm->radio_stats.on_time_scan =
 771                        le64_to_cpu(stats->general.common.on_time_scan);
 772
 773                data.general = &stats->general;
 774
 775                flags = stats->flag;
 776        }
 777
 778        iwl_mvm_rx_stats_check_trigger(mvm, pkt);
 779
 780        ieee80211_iterate_active_interfaces(mvm->hw,
 781                                            IEEE80211_IFACE_ITER_NORMAL,
 782                                            iwl_mvm_stat_iterator,
 783                                            &data);
 784
 785        if (!iwl_mvm_has_new_rx_api(mvm))
 786                return;
 787
 788        if (!iwl_mvm_has_new_rx_stats_api(mvm)) {
 789                struct iwl_notif_statistics_v11 *v11 = (void *)&pkt->data;
 790
 791                energy = (void *)&v11->load_stats.avg_energy;
 792                bytes = (void *)&v11->load_stats.byte_count;
 793                air_time = (void *)&v11->load_stats.air_time;
 794        } else {
 795                struct iwl_notif_statistics *stats = (void *)&pkt->data;
 796
 797                energy = (void *)&stats->load_stats.avg_energy;
 798                bytes = (void *)&stats->load_stats.byte_count;
 799                air_time = (void *)&stats->load_stats.air_time;
 800        }
 801
 802        rcu_read_lock();
 803        for (i = 0; i < ARRAY_SIZE(mvm->fw_id_to_mac_id); i++) {
 804                struct iwl_mvm_sta *sta;
 805
 806                if (!energy[i])
 807                        continue;
 808
 809                sta = iwl_mvm_sta_from_staid_rcu(mvm, i);
 810                if (!sta)
 811                        continue;
 812                sta->avg_energy = energy[i];
 813        }
 814        rcu_read_unlock();
 815
 816        /*
 817         * Don't update in case the statistics are not cleared, since
 818         * we will end up counting twice the same airtime, once in TCM
 819         * request and once in statistics notification.
 820         */
 821        if (!(le32_to_cpu(flags) & IWL_STATISTICS_REPLY_FLG_CLEAR))
 822                return;
 823
 824        spin_lock(&mvm->tcm.lock);
 825        for (i = 0; i < NUM_MAC_INDEX_DRIVER; i++) {
 826                struct iwl_mvm_tcm_mac *mdata = &mvm->tcm.data[i];
 827                u32 airtime = le32_to_cpu(air_time[i]);
 828                u32 rx_bytes = le32_to_cpu(bytes[i]);
 829
 830                mdata->uapsd_nonagg_detect.rx_bytes += rx_bytes;
 831                if (airtime) {
 832                        /* re-init every time to store rate from FW */
 833                        ewma_rate_init(&mdata->uapsd_nonagg_detect.rate);
 834                        ewma_rate_add(&mdata->uapsd_nonagg_detect.rate,
 835                                      rx_bytes * 8 / airtime);
 836                }
 837
 838                mdata->rx.airtime += airtime;
 839        }
 840        spin_unlock(&mvm->tcm.lock);
 841}
 842
 843void iwl_mvm_rx_statistics(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
 844{
 845        iwl_mvm_handle_rx_statistics(mvm, rxb_addr(rxb));
 846}
 847
 848void iwl_mvm_window_status_notif(struct iwl_mvm *mvm,
 849                                 struct iwl_rx_cmd_buffer *rxb)
 850{
 851        struct iwl_rx_packet *pkt = rxb_addr(rxb);
 852        struct iwl_ba_window_status_notif *notif = (void *)pkt->data;
 853        int i;
 854        u32 pkt_len = iwl_rx_packet_payload_len(pkt);
 855
 856        if (WARN_ONCE(pkt_len != sizeof(*notif),
 857                      "Received window status notification of wrong size (%u)\n",
 858                      pkt_len))
 859                return;
 860
 861        rcu_read_lock();
 862        for (i = 0; i < BA_WINDOW_STREAMS_MAX; i++) {
 863                struct ieee80211_sta *sta;
 864                u8 sta_id, tid;
 865                u64 bitmap;
 866                u32 ssn;
 867                u16 ratid;
 868                u16 received_mpdu;
 869
 870                ratid = le16_to_cpu(notif->ra_tid[i]);
 871                /* check that this TID is valid */
 872                if (!(ratid & BA_WINDOW_STATUS_VALID_MSK))
 873                        continue;
 874
 875                received_mpdu = le16_to_cpu(notif->mpdu_rx_count[i]);
 876                if (received_mpdu == 0)
 877                        continue;
 878
 879                tid = ratid & BA_WINDOW_STATUS_TID_MSK;
 880                /* get the station */
 881                sta_id = (ratid & BA_WINDOW_STATUS_STA_ID_MSK)
 882                         >> BA_WINDOW_STATUS_STA_ID_POS;
 883                sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
 884                if (IS_ERR_OR_NULL(sta))
 885                        continue;
 886                bitmap = le64_to_cpu(notif->bitmap[i]);
 887                ssn = le32_to_cpu(notif->start_seq_num[i]);
 888
 889                /* update mac80211 with the bitmap for the reordering buffer */
 890                ieee80211_mark_rx_ba_filtered_frames(sta, tid, ssn, bitmap,
 891                                                     received_mpdu);
 892        }
 893        rcu_read_unlock();
 894}
 895