/******************************************************************************
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
 * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * The full GNU General Public License is included in this distribution
 * in the file called COPYING.
 *
 * Contact Information:
 *  Intel Linux Wireless <linuxwifi@intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 * BSD LICENSE
 *
 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *  * Neither the name Intel Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *****************************************************************************/
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include "iwl-trans.h"
#include "mvm.h"
#include "fw-api.h"

/*
 * iwl_mvm_rx_rx_phy_cmd - REPLY_RX_PHY_CMD handler
 *
 * Copies the phy information in mvm->last_phy_info, it will be used when the
 * actual data will come from the fw in the next packet.
 */
void iwl_mvm_rx_rx_phy_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
{
        struct iwl_rx_packet *pkt = rxb_addr(rxb);

        memcpy(&mvm->last_phy_info, pkt->data, sizeof(mvm->last_phy_info));
        mvm->ampdu_ref++;

#ifdef CONFIG_IWLWIFI_DEBUGFS
        if (mvm->last_phy_info.phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
                spin_lock(&mvm->drv_stats_lock);
                mvm->drv_rx_stats.ampdu_count++;
                spin_unlock(&mvm->drv_stats_lock);
        }
#endif
}

/*
 * iwl_mvm_pass_packet_to_mac80211 - builds the packet for mac80211
 *
 * Adds the rxb to a new skb and give it to mac80211
 */
static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm,
                                            struct ieee80211_sta *sta,
                                            struct napi_struct *napi,
                                            struct sk_buff *skb,
                                            struct ieee80211_hdr *hdr, u16 len,
                                            u8 crypt_len,
                                            struct iwl_rx_cmd_buffer *rxb)
{
        unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
        unsigned int fraglen;

        /*
         * The 'hdrlen' (plus the 8 bytes for the SNAP and the crypt_len,
         * but those are all multiples of 4 long) all goes away, but we
         * want the *end* of it, which is going to be the start of the IP
         * header, to be aligned when it gets pulled in.
         * The beginning of the skb->data is aligned on at least a 4-byte
         * boundary after allocation. Everything here is aligned at least
         * on a 2-byte boundary so we can just take hdrlen & 3 and pad by
         * the result.
         */
        skb_reserve(skb, hdrlen & 3);

        /* If frame is small enough to fit in skb->head, pull it completely.
         * If not, only pull ieee80211_hdr (including crypto if present, and
         * an additional 8 bytes for SNAP/ethertype, see below) so that
         * splice() or TCP coalesce are more efficient.
         *
         * Since, in addition, ieee80211_data_to_8023() always pull in at
         * least 8 bytes (possibly more for mesh) we can do the same here
         * to save the cost of doing it later. That still doesn't pull in
         * the actual IP header since the typical case has a SNAP header.
         * If the latter changes (there are efforts in the standards group
         * to do so) we should revisit this and ieee80211_data_to_8023().
         */
        hdrlen = (len <= skb_tailroom(skb)) ? len : hdrlen + crypt_len + 8;

        skb_put_data(skb, hdr, hdrlen);
        fraglen = len - hdrlen;

        if (fraglen) {
                int offset = (void *)hdr + hdrlen -
                             rxb_addr(rxb) + rxb_offset(rxb);

                skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
                                fraglen, rxb->truesize);
        }

        ieee80211_rx_napi(mvm->hw, sta, skb, napi);
}

/*
 * iwl_mvm_get_signal_strength - use new rx PHY INFO API
 * values are reported by the fw as positive values - need to negate
 * to obtain their dBM.  Account for missing antennas by replacing 0
 * values by -256dBm: practically 0 power and a non-feasible 8 bit value.
 */
static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm,
                                        struct iwl_rx_phy_info *phy_info,
                                        struct ieee80211_rx_status *rx_status)
{
        int energy_a, energy_b, energy_c, max_energy;
        u32 val;

        val =
            le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_ENERGY_ANT_ABC_IDX]);
        energy_a = (val & IWL_RX_INFO_ENERGY_ANT_A_MSK) >>
                                                IWL_RX_INFO_ENERGY_ANT_A_POS;
        energy_a = energy_a ? -energy_a : S8_MIN;
        energy_b = (val & IWL_RX_INFO_ENERGY_ANT_B_MSK) >>
                                                IWL_RX_INFO_ENERGY_ANT_B_POS;
        energy_b = energy_b ? -energy_b : S8_MIN;
        energy_c = (val & IWL_RX_INFO_ENERGY_ANT_C_MSK) >>
                                                IWL_RX_INFO_ENERGY_ANT_C_POS;
        energy_c = energy_c ? -energy_c : S8_MIN;
        max_energy = max(energy_a, energy_b);
        max_energy = max(max_energy, energy_c);

        IWL_DEBUG_STATS(mvm, "energy In A %d B %d C %d , and max %d\n",
                        energy_a, energy_b, energy_c, max_energy);

        rx_status->signal = max_energy;
        rx_status->chains = (le16_to_cpu(phy_info->phy_flags) &
                                RX_RES_PHY_FLAGS_ANTENNA)
                                        >> RX_RES_PHY_FLAGS_ANTENNA_POS;
        rx_status->chain_signal[0] = energy_a;
        rx_status->chain_signal[1] = energy_b;
        rx_status->chain_signal[2] = energy_c;
}

/*
 * iwl_mvm_set_mac80211_rx_flag - translate fw status to mac80211 format
 * @mvm: the mvm object
 * @hdr: 80211 header
 * @stats: status in mac80211's format
 * @rx_pkt_status: status coming from fw
 *
 * returns non 0 value if the packet should be dropped
 */
static u32 iwl_mvm_set_mac80211_rx_flag(struct iwl_mvm *mvm,
                                        struct ieee80211_hdr *hdr,
                                        struct ieee80211_rx_status *stats,
                                        u32 rx_pkt_status,
                                        u8 *crypt_len)
{
        if (!ieee80211_has_protected(hdr->frame_control) ||
            (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
                             RX_MPDU_RES_STATUS_SEC_NO_ENC)
                return 0;

        /* packet was encrypted with unknown alg */
        if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
                                        RX_MPDU_RES_STATUS_SEC_ENC_ERR)
                return 0;

        switch (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) {
        case RX_MPDU_RES_STATUS_SEC_CCM_ENC:
                /* alg is CCM: check MIC only */
                if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
                        return -1;

                stats->flag |= RX_FLAG_DECRYPTED;
                *crypt_len = IEEE80211_CCMP_HDR_LEN;
                return 0;

        case RX_MPDU_RES_STATUS_SEC_TKIP_ENC:
                /* Don't drop the frame and decrypt it in SW */
                if (!fw_has_api(&mvm->fw->ucode_capa,
                                IWL_UCODE_TLV_API_DEPRECATE_TTAK) &&
                    !(rx_pkt_status & RX_MPDU_RES_STATUS_TTAK_OK))
                        return 0;
                *crypt_len = IEEE80211_TKIP_IV_LEN;
                /* fall through */

        case RX_MPDU_RES_STATUS_SEC_WEP_ENC:
                if (!(rx_pkt_status & RX_MPDU_RES_STATUS_ICV_OK))
                        return -1;

                stats->flag |= RX_FLAG_DECRYPTED;
                if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
                                RX_MPDU_RES_STATUS_SEC_WEP_ENC)
                        *crypt_len = IEEE80211_WEP_IV_LEN;
                return 0;

        case RX_MPDU_RES_STATUS_SEC_EXT_ENC:
                if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
                        return -1;
                stats->flag |= RX_FLAG_DECRYPTED;
                return 0;

        default:
                /* Expected in monitor (not having the keys) */
                if (!mvm->monitor_on)
                        IWL_ERR(mvm, "Unhandled alg: 0x%x\n", rx_pkt_status);
        }

        return 0;
}

static void iwl_mvm_rx_handle_tcm(struct iwl_mvm *mvm,
                                  struct ieee80211_sta *sta,
                                  struct ieee80211_hdr *hdr, u32 len,
                                  struct iwl_rx_phy_info *phy_info,
                                  u32 rate_n_flags)
{
        struct iwl_mvm_sta *mvmsta;
        struct iwl_mvm_tcm_mac *mdata;
        int mac;
        int ac = IEEE80211_AC_BE; /* treat non-QoS as BE */
        struct iwl_mvm_vif *mvmvif;
        /* expected throughput in 100Kbps, single stream, 20 MHz */
        static const u8 thresh_tpt[] = {
                9, 18, 30, 42, 60, 78, 90, 96, 120, 135,
        };
        u16 thr;

        if (ieee80211_is_data_qos(hdr->frame_control))
                ac = tid_to_mac80211_ac[ieee80211_get_tid(hdr)];

        mvmsta = iwl_mvm_sta_from_mac80211(sta);
        mac = mvmsta->mac_id_n_color & FW_CTXT_ID_MSK;

        if (time_after(jiffies, mvm->tcm.ts + MVM_TCM_PERIOD))
                schedule_delayed_work(&mvm->tcm.work, 0);
        mdata = &mvm->tcm.data[mac];
        mdata->rx.pkts[ac]++;

        /* count the airtime only once for each ampdu */
        if (mdata->rx.last_ampdu_ref != mvm->ampdu_ref) {
                mdata->rx.last_ampdu_ref = mvm->ampdu_ref;
                mdata->rx.airtime += le16_to_cpu(phy_info->frame_time);
        }

        if (!(rate_n_flags & (RATE_MCS_HT_MSK | RATE_MCS_VHT_MSK)))
                return;

        mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);

        if (mdata->opened_rx_ba_sessions ||
            mdata->uapsd_nonagg_detect.detected ||
            (!mvmvif->queue_params[IEEE80211_AC_VO].uapsd &&
             !mvmvif->queue_params[IEEE80211_AC_VI].uapsd &&
             !mvmvif->queue_params[IEEE80211_AC_BE].uapsd &&
             !mvmvif->queue_params[IEEE80211_AC_BK].uapsd) ||
            mvmsta->sta_id != mvmvif->ap_sta_id)
                return;

        if (rate_n_flags & RATE_MCS_HT_MSK) {
                thr = thresh_tpt[rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK];
                thr *= 1 + ((rate_n_flags & RATE_HT_MCS_NSS_MSK) >>
                                        RATE_HT_MCS_NSS_POS);
        } else {
                if (WARN_ON((rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK) >=
                                ARRAY_SIZE(thresh_tpt)))
                        return;
                thr = thresh_tpt[rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK];
                thr *= 1 + ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
                                        RATE_VHT_MCS_NSS_POS);
        }

        thr <<= ((rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) >>
                                RATE_MCS_CHAN_WIDTH_POS);

        mdata->uapsd_nonagg_detect.rx_bytes += len;
        ewma_rate_add(&mdata->uapsd_nonagg_detect.rate, thr);
}

static void iwl_mvm_rx_csum(struct ieee80211_sta *sta,
                            struct sk_buff *skb,
                            u32 status)
{
        struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);

        if (mvmvif->features & NETIF_F_RXCSUM &&
            status & RX_MPDU_RES_STATUS_CSUM_DONE &&
            status & RX_MPDU_RES_STATUS_CSUM_OK)
                skb->ip_summed = CHECKSUM_UNNECESSARY;
}

/*
 * iwl_mvm_rx_rx_mpdu - REPLY_RX_MPDU_CMD handler
 *
 * Handles the actual data of the Rx packet from the fw
 */
void iwl_mvm_rx_rx_mpdu(struct iwl_mvm *mvm, struct napi_struct *napi,
                        struct iwl_rx_cmd_buffer *rxb)
{
        struct ieee80211_hdr *hdr;
        struct ieee80211_rx_status *rx_status;
        struct iwl_rx_packet *pkt = rxb_addr(rxb);
        struct iwl_rx_phy_info *phy_info;
        struct iwl_rx_mpdu_res_start *rx_res;
        struct ieee80211_sta *sta = NULL;
        struct sk_buff *skb;
        u32 len;
        u32 rate_n_flags;
        u32 rx_pkt_status;
        u8 crypt_len = 0;
        bool take_ref;

        phy_info = &mvm->last_phy_info;
        rx_res = (struct iwl_rx_mpdu_res_start *)pkt->data;
        hdr = (struct ieee80211_hdr *)(pkt->data + sizeof(*rx_res));
        len = le16_to_cpu(rx_res->byte_count);
        rx_pkt_status = le32_to_cpup((__le32 *)
                (pkt->data + sizeof(*rx_res) + len));

        /* Dont use dev_alloc_skb(), we'll have enough headroom once
         * ieee80211_hdr pulled.
         */
        skb = alloc_skb(128, GFP_ATOMIC);
        if (!skb) {
                IWL_ERR(mvm, "alloc_skb failed\n");
                return;
        }

        rx_status = IEEE80211_SKB_RXCB(skb);

        /*
         * drop the packet if it has failed being decrypted by HW
         */
        if (iwl_mvm_set_mac80211_rx_flag(mvm, hdr, rx_status, rx_pkt_status,
                                         &crypt_len)) {
                IWL_DEBUG_DROP(mvm, "Bad decryption results 0x%08x\n",
                               rx_pkt_status);
                kfree_skb(skb);
                return;
        }

        /*
         * Keep packets with CRC errors (and with overrun) for monitor mode
         * (otherwise the firmware discards them) but mark them as bad.
         */
        if (!(rx_pkt_status & RX_MPDU_RES_STATUS_CRC_OK) ||
            !(rx_pkt_status & RX_MPDU_RES_STATUS_OVERRUN_OK)) {
                IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n", rx_pkt_status);
                rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
        }

        /* This will be used in several places later */
        rate_n_flags = le32_to_cpu(phy_info->rate_n_flags);

        /* rx_status carries information about the packet to mac80211 */
        rx_status->mactime = le64_to_cpu(phy_info->timestamp);
        rx_status->device_timestamp = le32_to_cpu(phy_info->system_timestamp);
        rx_status->band =
                (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_BAND_24)) ?
                                NL80211_BAND_2GHZ : NL80211_BAND_5GHZ;
        rx_status->freq =
                ieee80211_channel_to_frequency(le16_to_cpu(phy_info->channel),
                                               rx_status->band);

        /* TSF as indicated by the firmware  is at INA time */
        rx_status->flag |= RX_FLAG_MACTIME_PLCP_START;

        iwl_mvm_get_signal_strength(mvm, phy_info, rx_status);

        IWL_DEBUG_STATS_LIMIT(mvm, "Rssi %d, TSF %llu\n", rx_status->signal,
                              (unsigned long long)rx_status->mactime);

        rcu_read_lock();
        if (rx_pkt_status & RX_MPDU_RES_STATUS_SRC_STA_FOUND) {
                u32 id = rx_pkt_status & RX_MPDU_RES_STATUS_STA_ID_MSK;

                id >>= RX_MDPU_RES_STATUS_STA_ID_SHIFT;

                if (!WARN_ON_ONCE(id >= ARRAY_SIZE(mvm->fw_id_to_mac_id))) {
                        sta = rcu_dereference(mvm->fw_id_to_mac_id[id]);
                        if (IS_ERR(sta))
                                sta = NULL;
                }
        } else if (!is_multicast_ether_addr(hdr->addr2)) {
                /* This is fine since we prevent two stations with the same
                 * address from being added.
                 */
                sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL);
        }

        if (sta) {
                struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
                struct ieee80211_vif *tx_blocked_vif =
                        rcu_dereference(mvm->csa_tx_blocked_vif);
                struct iwl_fw_dbg_trigger_tlv *trig;
                struct ieee80211_vif *vif = mvmsta->vif;

                /* We have tx blocked stations (with CS bit). If we heard
                 * frames from a blocked station on a new channel we can
                 * TX to it again.
                 */
                if (unlikely(tx_blocked_vif) && vif == tx_blocked_vif) {
                        struct iwl_mvm_vif *mvmvif =
                                iwl_mvm_vif_from_mac80211(tx_blocked_vif);

                        if (mvmvif->csa_target_freq == rx_status->freq)
                                iwl_mvm_sta_modify_disable_tx_ap(mvm, sta,
                                                                 false);
                }

                rs_update_last_rssi(mvm, mvmsta, rx_status);

                trig = iwl_fw_dbg_trigger_on(&mvm->fwrt,
                                             ieee80211_vif_to_wdev(vif),
                                             FW_DBG_TRIGGER_RSSI);

                if (trig && ieee80211_is_beacon(hdr->frame_control)) {
                        struct iwl_fw_dbg_trigger_low_rssi *rssi_trig;
                        s32 rssi;

                        rssi_trig = (void *)trig->data;
                        rssi = le32_to_cpu(rssi_trig->rssi);

                        if (rx_status->signal < rssi)
                                iwl_fw_dbg_collect_trig(&mvm->fwrt, trig,
                                                        NULL);
                }

                if (!mvm->tcm.paused && len >= sizeof(*hdr) &&
                    !is_multicast_ether_addr(hdr->addr1) &&
                    ieee80211_is_data(hdr->frame_control))
                        iwl_mvm_rx_handle_tcm(mvm, sta, hdr, len, phy_info,
                                              rate_n_flags);

                if (ieee80211_is_data(hdr->frame_control))
                        iwl_mvm_rx_csum(sta, skb, rx_pkt_status);
        }
        rcu_read_unlock();

        /* set the preamble flag if appropriate */
        if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_SHORT_PREAMBLE))
                rx_status->enc_flags |= RX_ENC_FLAG_SHORTPRE;

        if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
                /*
                 * We know which subframes of an A-MPDU belong
                 * together since we get a single PHY response
                 * from the firmware for all of them
                 */
                rx_status->flag |= RX_FLAG_AMPDU_DETAILS;
                rx_status->ampdu_reference = mvm->ampdu_ref;
        }

        /* Set up the HT phy flags */
        switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
        case RATE_MCS_CHAN_WIDTH_20:
                break;
        case RATE_MCS_CHAN_WIDTH_40:
                rx_status->bw = RATE_INFO_BW_40;
                break;
        case RATE_MCS_CHAN_WIDTH_80:
                rx_status->bw = RATE_INFO_BW_80;
                break;
        case RATE_MCS_CHAN_WIDTH_160:
                rx_status->bw = RATE_INFO_BW_160;
                break;
        }
        if (!(rate_n_flags & RATE_MCS_CCK_MSK) &&
            rate_n_flags & RATE_MCS_SGI_MSK)
                rx_status->enc_flags |= RX_ENC_FLAG_SHORT_GI;
        if (rate_n_flags & RATE_HT_MCS_GF_MSK)
                rx_status->enc_flags |= RX_ENC_FLAG_HT_GF;
        if (rate_n_flags & RATE_MCS_LDPC_MSK)
                rx_status->enc_flags |= RX_ENC_FLAG_LDPC;
        if (rate_n_flags & RATE_MCS_HT_MSK) {
                u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >>
                                RATE_MCS_STBC_POS;
                rx_status->encoding = RX_ENC_HT;
                rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
                rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT;
        } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
                u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >>
                                RATE_MCS_STBC_POS;
                rx_status->nss =
                        ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
                                                RATE_VHT_MCS_NSS_POS) + 1;
                rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
                rx_status->encoding = RX_ENC_VHT;
                rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT;
                if (rate_n_flags & RATE_MCS_BF_MSK)
                        rx_status->enc_flags |= RX_ENC_FLAG_BF;
        } else {
                int rate = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
                                                               rx_status->band);

                if (WARN(rate < 0 || rate > 0xFF,
                         "Invalid rate flags 0x%x, band %d,\n",
                         rate_n_flags, rx_status->band)) {
                        kfree_skb(skb);
                        return;
                }
                rx_status->rate_idx = rate;
        }

#ifdef CONFIG_IWLWIFI_DEBUGFS
        iwl_mvm_update_frame_stats(mvm, rate_n_flags,
                                   rx_status->flag & RX_FLAG_AMPDU_DETAILS);
#endif

        if (unlikely((ieee80211_is_beacon(hdr->frame_control) ||
                      ieee80211_is_probe_resp(hdr->frame_control)) &&
                     mvm->sched_scan_pass_all == SCHED_SCAN_PASS_ALL_ENABLED))
                mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_FOUND;

        if (unlikely(ieee80211_is_beacon(hdr->frame_control) ||
                     ieee80211_is_probe_resp(hdr->frame_control)))
                rx_status->boottime_ns = ktime_get_boottime_ns();

        /* Take a reference briefly to kick off a d0i3 entry delay so
         * we can handle bursts of RX packets without toggling the
         * state too often.  But don't do this for beacons if we are
         * going to idle because the beacon filtering changes we make
         * cause the firmware to send us collateral beacons. */
        take_ref = !(test_bit(STATUS_TRANS_GOING_IDLE, &mvm->trans->status) &&
                     ieee80211_is_beacon(hdr->frame_control));

        if (take_ref)
                iwl_mvm_ref(mvm, IWL_MVM_REF_RX);

        iwl_mvm_pass_packet_to_mac80211(mvm, sta, napi, skb, hdr, len,
                                        crypt_len, rxb);

        if (take_ref)
                iwl_mvm_unref(mvm, IWL_MVM_REF_RX);
}

struct iwl_mvm_stat_data {
        struct iwl_mvm *mvm;
        __le32 mac_id;
        u8 beacon_filter_average_energy;
        void *general;
};

static void iwl_mvm_stat_iterator(void *_data, u8 *mac,
                                  struct ieee80211_vif *vif)
{
        struct iwl_mvm_stat_data *data = _data;
        struct iwl_mvm *mvm = data->mvm;
        int sig = -data->beacon_filter_average_energy;
        int last_event;
        int thold = vif->bss_conf.cqm_rssi_thold;
        int hyst = vif->bss_conf.cqm_rssi_hyst;
        u16 id = le32_to_cpu(data->mac_id);
        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
        u16 vif_id = mvmvif->id;

        /* This doesn't need the MAC ID check since it's not taking the
         * data copied into the "data" struct, but rather the data from
         * the notification directly.
         */
        if (iwl_mvm_has_new_rx_stats_api(mvm)) {
                struct mvm_statistics_general *general =
                        data->general;

                mvmvif->beacon_stats.num_beacons =
                        le32_to_cpu(general->beacon_counter[vif_id]);
                mvmvif->beacon_stats.avg_signal =
                        -general->beacon_average_energy[vif_id];
        } else {
                struct mvm_statistics_general_v8 *general =
                        data->general;

                mvmvif->beacon_stats.num_beacons =
                        le32_to_cpu(general->beacon_counter[vif_id]);
                mvmvif->beacon_stats.avg_signal =
                        -general->beacon_average_energy[vif_id];
        }

        if (mvmvif->id != id)
                return;

        if (vif->type != NL80211_IFTYPE_STATION)
                return;

        if (sig == 0) {
                IWL_DEBUG_RX(mvm, "RSSI is 0 - skip signal based decision\n");
                return;
        }

        mvmvif->bf_data.ave_beacon_signal = sig;

        /* BT Coex */
        if (mvmvif->bf_data.bt_coex_min_thold !=
            mvmvif->bf_data.bt_coex_max_thold) {
                last_event = mvmvif->bf_data.last_bt_coex_event;
                if (sig > mvmvif->bf_data.bt_coex_max_thold &&
                    (last_event <= mvmvif->bf_data.bt_coex_min_thold ||
                     last_event == 0)) {
                        mvmvif->bf_data.last_bt_coex_event = sig;
                        IWL_DEBUG_RX(mvm, "cqm_iterator bt coex high %d\n",
                                     sig);
                        iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_HIGH);
                } else if (sig < mvmvif->bf_data.bt_coex_min_thold &&
                           (last_event >= mvmvif->bf_data.bt_coex_max_thold ||
                            last_event == 0)) {
                        mvmvif->bf_data.last_bt_coex_event = sig;
                        IWL_DEBUG_RX(mvm, "cqm_iterator bt coex low %d\n",
                                     sig);
                        iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_LOW);
                }
        }

        if (!(vif->driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI))
                return;

        /* CQM Notification */
        last_event = mvmvif->bf_data.last_cqm_event;
        if (thold && sig < thold && (last_event == 0 ||
                                     sig < last_event - hyst)) {
                mvmvif->bf_data.last_cqm_event = sig;
                IWL_DEBUG_RX(mvm, "cqm_iterator cqm low %d\n",
                             sig);
                ieee80211_cqm_rssi_notify(
                        vif,
                        NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
                        sig,
                        GFP_KERNEL);
        } else if (sig > thold &&
                   (last_event == 0 || sig > last_event + hyst)) {
                mvmvif->bf_data.last_cqm_event = sig;
                IWL_DEBUG_RX(mvm, "cqm_iterator cqm high %d\n",
                             sig);
                ieee80211_cqm_rssi_notify(
                        vif,
                        NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
                        sig,
                        GFP_KERNEL);
        }
}

static inline void
iwl_mvm_rx_stats_check_trigger(struct iwl_mvm *mvm, struct iwl_rx_packet *pkt)
{
        struct iwl_fw_dbg_trigger_tlv *trig;
        struct iwl_fw_dbg_trigger_stats *trig_stats;
        u32 trig_offset, trig_thold;

        trig = iwl_fw_dbg_trigger_on(&mvm->fwrt, NULL, FW_DBG_TRIGGER_STATS);
        if (!trig)
                return;

        trig_stats = (void *)trig->data;

        trig_offset = le32_to_cpu(trig_stats->stop_offset);
        trig_thold = le32_to_cpu(trig_stats->stop_threshold);

        if (WARN_ON_ONCE(trig_offset >= iwl_rx_packet_payload_len(pkt)))
                return;

        if (le32_to_cpup((__le32 *) (pkt->data + trig_offset)) < trig_thold)
                return;

        iwl_fw_dbg_collect_trig(&mvm->fwrt, trig, NULL);
}

void iwl_mvm_handle_rx_statistics(struct iwl_mvm *mvm,
                                  struct iwl_rx_packet *pkt)
{
        struct iwl_mvm_stat_data data = {
                .mvm = mvm,
        };
        int expected_size;
        int i;
        u8 *energy;
        __le32 *bytes;
        __le32 *air_time;
        __le32 flags;

        if (!iwl_mvm_has_new_rx_stats_api(mvm)) {
                if (iwl_mvm_has_new_rx_api(mvm))
                        expected_size = sizeof(struct iwl_notif_statistics_v11);
                else
                        expected_size = sizeof(struct iwl_notif_statistics_v10);
        } else {
                expected_size = sizeof(struct iwl_notif_statistics);
        }

        if (WARN_ONCE(iwl_rx_packet_payload_len(pkt) != expected_size,
                      "received invalid statistics size (%d)!\n",
                      iwl_rx_packet_payload_len(pkt)))
                return;

        if (!iwl_mvm_has_new_rx_stats_api(mvm)) {
                struct iwl_notif_statistics_v11 *stats = (void *)&pkt->data;

                data.mac_id = stats->rx.general.mac_id;
                data.beacon_filter_average_energy =
                        stats->general.common.beacon_filter_average_energy;

                mvm->rx_stats_v3 = stats->rx;

                mvm->radio_stats.rx_time =
                        le64_to_cpu(stats->general.common.rx_time);
                mvm->radio_stats.tx_time =
                        le64_to_cpu(stats->general.common.tx_time);
                mvm->radio_stats.on_time_rf =
                        le64_to_cpu(stats->general.common.on_time_rf);
                mvm->radio_stats.on_time_scan =
                        le64_to_cpu(stats->general.common.on_time_scan);

                data.general = &stats->general;

                flags = stats->flag;
        } else {
                struct iwl_notif_statistics *stats = (void *)&pkt->data;

                data.mac_id = stats->rx.general.mac_id;
                data.beacon_filter_average_energy =
                        stats->general.common.beacon_filter_average_energy;

                mvm->rx_stats = stats->rx;

                mvm->radio_stats.rx_time =
                        le64_to_cpu(stats->general.common.rx_time);
                mvm->radio_stats.tx_time =
                        le64_to_cpu(stats->general.common.tx_time);
                mvm->radio_stats.on_time_rf =
                        le64_to_cpu(stats->general.common.on_time_rf);
                mvm->radio_stats.on_time_scan =
                        le64_to_cpu(stats->general.common.on_time_scan);

                data.general = &stats->general;

                flags = stats->flag;
        }

        iwl_mvm_rx_stats_check_trigger(mvm, pkt);

        ieee80211_iterate_active_interfaces(mvm->hw,
                                            IEEE80211_IFACE_ITER_NORMAL,
                                            iwl_mvm_stat_iterator,
                                            &data);

        if (!iwl_mvm_has_new_rx_api(mvm))
                return;

        if (!iwl_mvm_has_new_rx_stats_api(mvm)) {
                struct iwl_notif_statistics_v11 *v11 = (void *)&pkt->data;

                energy = (void *)&v11->load_stats.avg_energy;
                bytes = (void *)&v11->load_stats.byte_count;
                air_time = (void *)&v11->load_stats.air_time;
        } else {
                struct iwl_notif_statistics *stats = (void *)&pkt->data;

                energy = (void *)&stats->load_stats.avg_energy;
                bytes = (void *)&stats->load_stats.byte_count;
                air_time = (void *)&stats->load_stats.air_time;
        }

        rcu_read_lock();
        for (i = 0; i < ARRAY_SIZE(mvm->fw_id_to_mac_id); i++) {
                struct iwl_mvm_sta *sta;

                if (!energy[i])
                        continue;

                sta = iwl_mvm_sta_from_staid_rcu(mvm, i);
                if (!sta)
                        continue;
                sta->avg_energy = energy[i];
        }
        rcu_read_unlock();

        /*
         * Don't update in case the statistics are not cleared, since
         * we will end up counting twice the same airtime, once in TCM
         * request and once in statistics notification.
         */
        if (!(le32_to_cpu(flags) & IWL_STATISTICS_REPLY_FLG_CLEAR))
                return;

        spin_lock(&mvm->tcm.lock);
        for (i = 0; i < NUM_MAC_INDEX_DRIVER; i++) {
                struct iwl_mvm_tcm_mac *mdata = &mvm->tcm.data[i];
                u32 airtime = le32_to_cpu(air_time[i]);
                u32 rx_bytes = le32_to_cpu(bytes[i]);

                mdata->uapsd_nonagg_detect.rx_bytes += rx_bytes;
                if (airtime) {
                        /* re-init every time to store rate from FW */
                        ewma_rate_init(&mdata->uapsd_nonagg_detect.rate);
                        ewma_rate_add(&mdata->uapsd_nonagg_detect.rate,
                                      rx_bytes * 8 / airtime);
                }

                mdata->rx.airtime += airtime;
        }
        spin_unlock(&mvm->tcm.lock);
}

void iwl_mvm_rx_statistics(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
{
        iwl_mvm_handle_rx_statistics(mvm, rxb_addr(rxb));
}

void iwl_mvm_window_status_notif(struct iwl_mvm *mvm,
                                 struct iwl_rx_cmd_buffer *rxb)
{
        struct iwl_rx_packet *pkt = rxb_addr(rxb);
        struct iwl_ba_window_status_notif *notif = (void *)pkt->data;
        int i;
        u32 pkt_len = iwl_rx_packet_payload_len(pkt);

        if (WARN_ONCE(pkt_len != sizeof(*notif),
                      "Received window status notification of wrong size (%u)\n",
                      pkt_len))
                return;

        rcu_read_lock();
        for (i = 0; i < BA_WINDOW_STREAMS_MAX; i++) {
                struct ieee80211_sta *sta;
                u8 sta_id, tid;
                u64 bitmap;
                u32 ssn;
                u16 ratid;
                u16 received_mpdu;

                ratid = le16_to_cpu(notif->ra_tid[i]);
                /* check that this TID is valid */
                if (!(ratid & BA_WINDOW_STATUS_VALID_MSK))
                        continue;

                received_mpdu = le16_to_cpu(notif->mpdu_rx_count[i]);
                if (received_mpdu == 0)
                        continue;

                tid = ratid & BA_WINDOW_STATUS_TID_MSK;
                /* get the station */
                sta_id = (ratid & BA_WINDOW_STATUS_STA_ID_MSK)
                         >> BA_WINDOW_STATUS_STA_ID_POS;
                sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
                if (IS_ERR_OR_NULL(sta))
                        continue;
                bitmap = le64_to_cpu(notif->bitmap[i]);
                ssn = le32_to_cpu(notif->start_seq_num[i]);

                /* update mac80211 with the bitmap for the reordering buffer */
                ieee80211_mark_rx_ba_filtered_frames(sta, tid, ssn, bitmap,
                                                     received_mpdu);
        }
        rcu_read_unlock();
}