// SPDX-License-Identifier: GPL-2.0-only
/*
 * VHT handling
 *
 * Portions of this file
 * Copyright(c) 2015 - 2016 Intel Deutschland GmbH
 * Copyright (C) 2018 - 2024 Intel Corporation
 */

#include <linux/ieee80211.h>
#include <linux/export.h>
#include <net/mac80211.h>
#include "ieee80211_i.h"
#include "rate.h"


static void __check_vhtcap_disable(struct ieee80211_sub_if_data *sdata,
                                   struct ieee80211_sta_vht_cap *vht_cap,
                                   u32 flag)
{
        __le32 le_flag = cpu_to_le32(flag);

        if (sdata->u.mgd.vht_capa_mask.vht_cap_info & le_flag &&
            !(sdata->u.mgd.vht_capa.vht_cap_info & le_flag))
                vht_cap->cap &= ~flag;
}

void ieee80211_apply_vhtcap_overrides(struct ieee80211_sub_if_data *sdata,
                                      struct ieee80211_sta_vht_cap *vht_cap)
{
        int i;
        u16 rxmcs_mask, rxmcs_cap, rxmcs_n, txmcs_mask, txmcs_cap, txmcs_n;

        if (!vht_cap->vht_supported)
                return;

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

        __check_vhtcap_disable(sdata, vht_cap,
                               IEEE80211_VHT_CAP_RXLDPC);
        __check_vhtcap_disable(sdata, vht_cap,
                               IEEE80211_VHT_CAP_SHORT_GI_80);
        __check_vhtcap_disable(sdata, vht_cap,
                               IEEE80211_VHT_CAP_SHORT_GI_160);
        __check_vhtcap_disable(sdata, vht_cap,
                               IEEE80211_VHT_CAP_TXSTBC);
        __check_vhtcap_disable(sdata, vht_cap,
                               IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE);
        __check_vhtcap_disable(sdata, vht_cap,
                               IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE);
        __check_vhtcap_disable(sdata, vht_cap,
                               IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN);
        __check_vhtcap_disable(sdata, vht_cap,
                               IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN);

        /* Allow user to decrease AMPDU length exponent */
        if (sdata->u.mgd.vht_capa_mask.vht_cap_info &
            cpu_to_le32(IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK)) {
                u32 cap, n;

                n = le32_to_cpu(sdata->u.mgd.vht_capa.vht_cap_info) &
                        IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;
                n >>= IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT;
                cap = vht_cap->cap & IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;
                cap >>= IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT;

                if (n < cap) {
                        vht_cap->cap &=
                                ~IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;
                        vht_cap->cap |=
                                n << IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT;
                }
        }

        /* Allow the user to decrease MCSes */
        rxmcs_mask =
                le16_to_cpu(sdata->u.mgd.vht_capa_mask.supp_mcs.rx_mcs_map);
        rxmcs_n = le16_to_cpu(sdata->u.mgd.vht_capa.supp_mcs.rx_mcs_map);
        rxmcs_n &= rxmcs_mask;
        rxmcs_cap = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map);

        txmcs_mask =
                le16_to_cpu(sdata->u.mgd.vht_capa_mask.supp_mcs.tx_mcs_map);
        txmcs_n = le16_to_cpu(sdata->u.mgd.vht_capa.supp_mcs.tx_mcs_map);
        txmcs_n &= txmcs_mask;
        txmcs_cap = le16_to_cpu(vht_cap->vht_mcs.tx_mcs_map);
        for (i = 0; i < 8; i++) {
                u8 m, n, c;

                m = (rxmcs_mask >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
                n = (rxmcs_n >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
                c = (rxmcs_cap >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;

                if (m && ((c != IEEE80211_VHT_MCS_NOT_SUPPORTED && n < c) ||
                          n == IEEE80211_VHT_MCS_NOT_SUPPORTED)) {
                        rxmcs_cap &= ~(3 << 2*i);
                        rxmcs_cap |= (rxmcs_n & (3 << 2*i));
                }

                m = (txmcs_mask >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
                n = (txmcs_n >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
                c = (txmcs_cap >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;

                if (m && ((c != IEEE80211_VHT_MCS_NOT_SUPPORTED && n < c) ||
                          n == IEEE80211_VHT_MCS_NOT_SUPPORTED)) {
                        txmcs_cap &= ~(3 << 2*i);
                        txmcs_cap |= (txmcs_n & (3 << 2*i));
                }
        }
        vht_cap->vht_mcs.rx_mcs_map = cpu_to_le16(rxmcs_cap);
        vht_cap->vht_mcs.tx_mcs_map = cpu_to_le16(txmcs_cap);
}

void
ieee80211_vht_cap_ie_to_sta_vht_cap(struct ieee80211_sub_if_data *sdata,
                                    struct ieee80211_supported_band *sband,
                                    const struct ieee80211_vht_cap *vht_cap_ie,
                                    const struct ieee80211_vht_cap *vht_cap_ie2,
                                    struct link_sta_info *link_sta)
{
        struct ieee80211_sta_vht_cap *vht_cap = &link_sta->pub->vht_cap;
        struct ieee80211_sta_vht_cap own_cap;
        u32 cap_info, i;
        bool have_80mhz;
        u32 mpdu_len;

        memset(vht_cap, 0, sizeof(*vht_cap));

        if (!link_sta->pub->ht_cap.ht_supported)
                return;

        if (!vht_cap_ie || !sband->vht_cap.vht_supported)
                return;

        /* Allow VHT if at least one channel on the sband supports 80 MHz */
        have_80mhz = false;
        for (i = 0; i < sband->n_channels; i++) {
                if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
                                                IEEE80211_CHAN_NO_80MHZ))
                        continue;

                have_80mhz = true;
                break;
        }

        if (!have_80mhz)
                return;

        /*
         * A VHT STA must support 40 MHz, but if we verify that here
         * then we break a few things - some APs (e.g. Netgear R6300v2
         * and others based on the BCM4360 chipset) will unset this
         * capability bit when operating in 20 MHz.
         */

        vht_cap->vht_supported = true;

        own_cap = sband->vht_cap;
        /*
         * If user has specified capability overrides, take care
         * of that if the station we're setting up is the AP that
         * we advertised a restricted capability set to. Override
         * our own capabilities and then use those below.
         */
        if (sdata->vif.type == NL80211_IFTYPE_STATION &&
            !test_sta_flag(link_sta->sta, WLAN_STA_TDLS_PEER))
                ieee80211_apply_vhtcap_overrides(sdata, &own_cap);

        /* take some capabilities as-is */
        cap_info = le32_to_cpu(vht_cap_ie->vht_cap_info);
        vht_cap->cap = cap_info;
        vht_cap->cap &= IEEE80211_VHT_CAP_RXLDPC |
                        IEEE80211_VHT_CAP_VHT_TXOP_PS |
                        IEEE80211_VHT_CAP_HTC_VHT |
                        IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK |
                        IEEE80211_VHT_CAP_VHT_LINK_ADAPTATION_VHT_UNSOL_MFB |
                        IEEE80211_VHT_CAP_VHT_LINK_ADAPTATION_VHT_MRQ_MFB |
                        IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN |
                        IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN;

        vht_cap->cap |= min_t(u32, cap_info & IEEE80211_VHT_CAP_MAX_MPDU_MASK,
                              own_cap.cap & IEEE80211_VHT_CAP_MAX_MPDU_MASK);

        /* and some based on our own capabilities */
        switch (own_cap.cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) {
        case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ:
                vht_cap->cap |= cap_info &
                                IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
                break;
        case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ:
                vht_cap->cap |= cap_info &
                                IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
                break;
        default:
                /* nothing */
                break;
        }

        /* symmetric capabilities */
        vht_cap->cap |= cap_info & own_cap.cap &
                        (IEEE80211_VHT_CAP_SHORT_GI_80 |
                         IEEE80211_VHT_CAP_SHORT_GI_160);

        /* remaining ones */
        if (own_cap.cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE)
                vht_cap->cap |= cap_info &
                                (IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE |
                                 IEEE80211_VHT_CAP_SOUNDING_DIMENSIONS_MASK);

        if (own_cap.cap & IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)
                vht_cap->cap |= cap_info &
                                (IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
                                 IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK);

        if (own_cap.cap & IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)
                vht_cap->cap |= cap_info &
                                IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;

        if (own_cap.cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE)
                vht_cap->cap |= cap_info &
                                IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE;

        if (own_cap.cap & IEEE80211_VHT_CAP_TXSTBC)
                vht_cap->cap |= cap_info & IEEE80211_VHT_CAP_RXSTBC_MASK;

        if (own_cap.cap & IEEE80211_VHT_CAP_RXSTBC_MASK)
                vht_cap->cap |= cap_info & IEEE80211_VHT_CAP_TXSTBC;

        /* Copy peer MCS info, the driver might need them. */
        memcpy(&vht_cap->vht_mcs, &vht_cap_ie->supp_mcs,
               sizeof(struct ieee80211_vht_mcs_info));

        /* copy EXT_NSS_BW Support value or remove the capability */
        if (ieee80211_hw_check(&sdata->local->hw, SUPPORTS_VHT_EXT_NSS_BW))
                vht_cap->cap |= (cap_info & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK);
        else
                vht_cap->vht_mcs.tx_highest &=
                        ~cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE);

        /* but also restrict MCSes */
        for (i = 0; i < 8; i++) {
                u16 own_rx, own_tx, peer_rx, peer_tx;

                own_rx = le16_to_cpu(own_cap.vht_mcs.rx_mcs_map);
                own_rx = (own_rx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;

                own_tx = le16_to_cpu(own_cap.vht_mcs.tx_mcs_map);
                own_tx = (own_tx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;

                peer_rx = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map);
                peer_rx = (peer_rx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;

                peer_tx = le16_to_cpu(vht_cap->vht_mcs.tx_mcs_map);
                peer_tx = (peer_tx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;

                if (peer_tx != IEEE80211_VHT_MCS_NOT_SUPPORTED) {
                        if (own_rx == IEEE80211_VHT_MCS_NOT_SUPPORTED)
                                peer_tx = IEEE80211_VHT_MCS_NOT_SUPPORTED;
                        else if (own_rx < peer_tx)
                                peer_tx = own_rx;
                }

                if (peer_rx != IEEE80211_VHT_MCS_NOT_SUPPORTED) {
                        if (own_tx == IEEE80211_VHT_MCS_NOT_SUPPORTED)
                                peer_rx = IEEE80211_VHT_MCS_NOT_SUPPORTED;
                        else if (own_tx < peer_rx)
                                peer_rx = own_tx;
                }

                vht_cap->vht_mcs.rx_mcs_map &=
                        ~cpu_to_le16(IEEE80211_VHT_MCS_NOT_SUPPORTED << i * 2);
                vht_cap->vht_mcs.rx_mcs_map |= cpu_to_le16(peer_rx << i * 2);

                vht_cap->vht_mcs.tx_mcs_map &=
                        ~cpu_to_le16(IEEE80211_VHT_MCS_NOT_SUPPORTED << i * 2);
                vht_cap->vht_mcs.tx_mcs_map |= cpu_to_le16(peer_tx << i * 2);
        }

        /*
         * This is a workaround for VHT-enabled STAs which break the spec
         * and have the VHT-MCS Rx map filled in with value 3 for all eight
         * spatial streams, an example is AR9462.
         *
         * As per spec, in section 22.1.1 Introduction to the VHT PHY
         * A VHT STA shall support at least single spatial stream VHT-MCSs
         * 0 to 7 (transmit and receive) in all supported channel widths.
         */
        if (vht_cap->vht_mcs.rx_mcs_map == cpu_to_le16(0xFFFF)) {
                vht_cap->vht_supported = false;
                sdata_info(sdata,
                           "Ignoring VHT IE from %pM (link:%pM) due to invalid rx_mcs_map\n",
                           link_sta->sta->addr, link_sta->addr);
                return;
        }

        /* finally set up the bandwidth */
        switch (vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) {
        case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ:
        case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ:
                link_sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160;
                break;
        default:
                link_sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80;

                if (!(vht_cap->vht_mcs.tx_highest &
                                cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE)))
                        break;

                /*
                 * If this is non-zero, then it does support 160 MHz after all,
                 * in one form or the other. We don't distinguish here (or even
                 * above) between 160 and 80+80 yet.
                 */
                if (cap_info & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK)
                        link_sta->cur_max_bandwidth =
                                IEEE80211_STA_RX_BW_160;
        }

        link_sta->pub->bandwidth = ieee80211_sta_cur_vht_bw(link_sta);

        /*
         * Work around the Cisco 9115 FW 17.3 bug by taking the min of
         * both reported MPDU lengths.
         */
        mpdu_len = vht_cap->cap & IEEE80211_VHT_CAP_MAX_MPDU_MASK;
        if (vht_cap_ie2)
                mpdu_len = min_t(u32, mpdu_len,
                                 le32_get_bits(vht_cap_ie2->vht_cap_info,
                                               IEEE80211_VHT_CAP_MAX_MPDU_MASK));

        /*
         * FIXME - should the amsdu len be per link? store per link
         * and maintain a minimum?
         */
        switch (mpdu_len) {
        case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454:
                link_sta->pub->agg.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_11454;
                break;
        case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_7991:
                link_sta->pub->agg.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_7991;
                break;
        case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_3895:
        default:
                link_sta->pub->agg.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_3895;
                break;
        }

        ieee80211_sta_recalc_aggregates(&link_sta->sta->sta);
}

/* FIXME: move this to some better location - parses HE/EHT now */
static enum ieee80211_sta_rx_bandwidth
__ieee80211_sta_cap_rx_bw(struct link_sta_info *link_sta,
                          struct cfg80211_chan_def *chandef)
{
        unsigned int link_id = link_sta->link_id;
        struct ieee80211_sub_if_data *sdata = link_sta->sta->sdata;
        struct ieee80211_sta_vht_cap *vht_cap = &link_sta->pub->vht_cap;
        struct ieee80211_sta_he_cap *he_cap = &link_sta->pub->he_cap;
        struct ieee80211_sta_eht_cap *eht_cap = &link_sta->pub->eht_cap;
        u32 cap_width;

        if (he_cap->has_he) {
                enum nl80211_band band;
                u8 info;

                if (chandef) {
                        band = chandef->chan->band;
                } else {
                        struct ieee80211_bss_conf *link_conf;

                        rcu_read_lock();
                        link_conf = rcu_dereference(sdata->vif.link_conf[link_id]);
                        band = link_conf->chanreq.oper.chan->band;
                        rcu_read_unlock();
                }

                if (eht_cap->has_eht && band == NL80211_BAND_6GHZ) {
                        info = eht_cap->eht_cap_elem.phy_cap_info[0];

                        if (info & IEEE80211_EHT_PHY_CAP0_320MHZ_IN_6GHZ)
                                return IEEE80211_STA_RX_BW_320;
                }

                info = he_cap->he_cap_elem.phy_cap_info[0];

                if (band == NL80211_BAND_2GHZ) {
                        if (info & IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_40MHZ_IN_2G)
                                return IEEE80211_STA_RX_BW_40;
                        return IEEE80211_STA_RX_BW_20;
                }

                if (info & IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_160MHZ_IN_5G ||
                    info & IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_80PLUS80_MHZ_IN_5G)
                        return IEEE80211_STA_RX_BW_160;

                if (info & IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_40MHZ_80MHZ_IN_5G)
                        return IEEE80211_STA_RX_BW_80;

                return IEEE80211_STA_RX_BW_20;
        }

        if (!vht_cap->vht_supported)
                return link_sta->pub->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
                                IEEE80211_STA_RX_BW_40 :
                                IEEE80211_STA_RX_BW_20;

        cap_width = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;

        if (cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
            cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
                return IEEE80211_STA_RX_BW_160;

        /*
         * If this is non-zero, then it does support 160 MHz after all,
         * in one form or the other. We don't distinguish here (or even
         * above) between 160 and 80+80 yet.
         */
        if (vht_cap->cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK)
                return IEEE80211_STA_RX_BW_160;

        return IEEE80211_STA_RX_BW_80;
}

enum ieee80211_sta_rx_bandwidth
_ieee80211_sta_cap_rx_bw(struct link_sta_info *link_sta,
                         struct cfg80211_chan_def *chandef)
{
        /*
         * With RX OMI, also pretend that the STA's capability changed.
         * Of course this isn't really true, it didn't change, only our
         * RX capability was changed by notifying RX OMI to the STA.
         * The purpose, however, is to save power, and that requires
         * changing also transmissions to the AP and the chanctx. The
         * transmissions depend on link_sta->bandwidth which is set in
         * _ieee80211_sta_cur_vht_bw() below, but the chanctx depends
         * on the result of this function which is also called by
         * _ieee80211_sta_cur_vht_bw(), so we need to do that here as
         * well. This is sufficient for the steady state, but during
         * the transition we already need to change TX/RX separately,
         * so _ieee80211_sta_cur_vht_bw() below applies the _tx one.
         */
        return min(__ieee80211_sta_cap_rx_bw(link_sta, chandef),
                   link_sta->rx_omi_bw_rx);
}

enum nl80211_chan_width
ieee80211_sta_cap_chan_bw(struct link_sta_info *link_sta)
{
        struct ieee80211_sta_vht_cap *vht_cap = &link_sta->pub->vht_cap;
        u32 cap_width;

        if (!vht_cap->vht_supported) {
                if (!link_sta->pub->ht_cap.ht_supported)
                        return NL80211_CHAN_WIDTH_20_NOHT;

                return link_sta->pub->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
                                NL80211_CHAN_WIDTH_40 : NL80211_CHAN_WIDTH_20;
        }

        cap_width = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;

        if (cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ)
                return NL80211_CHAN_WIDTH_160;
        else if (cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
                return NL80211_CHAN_WIDTH_80P80;

        return NL80211_CHAN_WIDTH_80;
}

enum nl80211_chan_width
ieee80211_sta_rx_bw_to_chan_width(struct link_sta_info *link_sta)
{
        enum ieee80211_sta_rx_bandwidth cur_bw =
                link_sta->pub->bandwidth;
        struct ieee80211_sta_vht_cap *vht_cap =
                &link_sta->pub->vht_cap;
        u32 cap_width;

        switch (cur_bw) {
        case IEEE80211_STA_RX_BW_20:
                if (!link_sta->pub->ht_cap.ht_supported)
                        return NL80211_CHAN_WIDTH_20_NOHT;
                else
                        return NL80211_CHAN_WIDTH_20;
        case IEEE80211_STA_RX_BW_40:
                return NL80211_CHAN_WIDTH_40;
        case IEEE80211_STA_RX_BW_80:
                return NL80211_CHAN_WIDTH_80;
        case IEEE80211_STA_RX_BW_160:
                cap_width =
                        vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;

                if (cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ)
                        return NL80211_CHAN_WIDTH_160;

                return NL80211_CHAN_WIDTH_80P80;
        default:
                return NL80211_CHAN_WIDTH_20;
        }
}

/* FIXME: rename/move - this deals with everything not just VHT */
enum ieee80211_sta_rx_bandwidth
_ieee80211_sta_cur_vht_bw(struct link_sta_info *link_sta,
                          struct cfg80211_chan_def *chandef)
{
        struct sta_info *sta = link_sta->sta;
        enum nl80211_chan_width bss_width;
        enum ieee80211_sta_rx_bandwidth bw;

        if (chandef) {
                bss_width = chandef->width;
        } else {
                struct ieee80211_bss_conf *link_conf;

                rcu_read_lock();
                link_conf = rcu_dereference(sta->sdata->vif.link_conf[link_sta->link_id]);
                if (WARN_ON_ONCE(!link_conf)) {
                        rcu_read_unlock();
                        return IEEE80211_STA_RX_BW_20;
                }
                bss_width = link_conf->chanreq.oper.width;
                rcu_read_unlock();
        }

        /* intentionally do not take rx_bw_omi_rx into account */
        bw = __ieee80211_sta_cap_rx_bw(link_sta, chandef);
        bw = min(bw, link_sta->cur_max_bandwidth);
        /* but do apply rx_omi_bw_tx */
        bw = min(bw, link_sta->rx_omi_bw_tx);

        /* Don't consider AP's bandwidth for TDLS peers, section 11.23.1 of
         * IEEE80211-2016 specification makes higher bandwidth operation
         * possible on the TDLS link if the peers have wider bandwidth
         * capability.
         *
         * However, in this case, and only if the TDLS peer is authorized,
         * limit to the tdls_chandef so that the configuration here isn't
         * wider than what's actually requested on the channel context.
         */
        if (test_sta_flag(sta, WLAN_STA_TDLS_PEER) &&
            test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW) &&
            test_sta_flag(sta, WLAN_STA_AUTHORIZED) &&
            sta->tdls_chandef.chan)
                bw = min(bw, ieee80211_chan_width_to_rx_bw(sta->tdls_chandef.width));
        else
                bw = min(bw, ieee80211_chan_width_to_rx_bw(bss_width));

        return bw;
}

void ieee80211_sta_init_nss(struct link_sta_info *link_sta)
{
        u8 ht_rx_nss = 0, vht_rx_nss = 0, he_rx_nss = 0, eht_rx_nss = 0, rx_nss;
        bool support_160;

        if (link_sta->pub->eht_cap.has_eht) {
                int i;
                const u8 *rx_nss_mcs = (void *)&link_sta->pub->eht_cap.eht_mcs_nss_supp;

                /* get the max nss for EHT over all possible bandwidths and mcs */
                for (i = 0; i < sizeof(struct ieee80211_eht_mcs_nss_supp); i++)
                        eht_rx_nss = max_t(u8, eht_rx_nss,
                                           u8_get_bits(rx_nss_mcs[i],
                                                       IEEE80211_EHT_MCS_NSS_RX));
        }

        if (link_sta->pub->he_cap.has_he) {
                int i;
                u8 rx_mcs_80 = 0, rx_mcs_160 = 0;
                const struct ieee80211_sta_he_cap *he_cap = &link_sta->pub->he_cap;
                u16 mcs_160_map =
                        le16_to_cpu(he_cap->he_mcs_nss_supp.rx_mcs_160);
                u16 mcs_80_map = le16_to_cpu(he_cap->he_mcs_nss_supp.rx_mcs_80);

                for (i = 7; i >= 0; i--) {
                        u8 mcs_160 = (mcs_160_map >> (2 * i)) & 3;

                        if (mcs_160 != IEEE80211_HE_MCS_NOT_SUPPORTED) {
                                rx_mcs_160 = i + 1;
                                break;
                        }
                }
                for (i = 7; i >= 0; i--) {
                        u8 mcs_80 = (mcs_80_map >> (2 * i)) & 3;

                        if (mcs_80 != IEEE80211_HE_MCS_NOT_SUPPORTED) {
                                rx_mcs_80 = i + 1;
                                break;
                        }
                }

                support_160 = he_cap->he_cap_elem.phy_cap_info[0] &
                              IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_160MHZ_IN_5G;

                if (support_160)
                        he_rx_nss = min(rx_mcs_80, rx_mcs_160);
                else
                        he_rx_nss = rx_mcs_80;
        }

        if (link_sta->pub->ht_cap.ht_supported) {
                if (link_sta->pub->ht_cap.mcs.rx_mask[0])
                        ht_rx_nss++;
                if (link_sta->pub->ht_cap.mcs.rx_mask[1])
                        ht_rx_nss++;
                if (link_sta->pub->ht_cap.mcs.rx_mask[2])
                        ht_rx_nss++;
                if (link_sta->pub->ht_cap.mcs.rx_mask[3])
                        ht_rx_nss++;
                /* FIXME: consider rx_highest? */
        }

        if (link_sta->pub->vht_cap.vht_supported) {
                int i;
                u16 rx_mcs_map;

                rx_mcs_map = le16_to_cpu(link_sta->pub->vht_cap.vht_mcs.rx_mcs_map);

                for (i = 7; i >= 0; i--) {
                        u8 mcs = (rx_mcs_map >> (2 * i)) & 3;

                        if (mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED) {
                                vht_rx_nss = i + 1;
                                break;
                        }
                }
                /* FIXME: consider rx_highest? */
        }

        rx_nss = max(vht_rx_nss, ht_rx_nss);
        rx_nss = max(he_rx_nss, rx_nss);
        rx_nss = max(eht_rx_nss, rx_nss);
        rx_nss = max_t(u8, 1, rx_nss);
        link_sta->capa_nss = rx_nss;

        /* that shouldn't be set yet, but we can handle it anyway */
        if (link_sta->op_mode_nss)
                link_sta->pub->rx_nss =
                        min_t(u8, rx_nss, link_sta->op_mode_nss);
        else
                link_sta->pub->rx_nss = rx_nss;
}

u32 __ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
                                  struct link_sta_info *link_sta,
                                  u8 opmode, enum nl80211_band band)
{
        enum ieee80211_sta_rx_bandwidth new_bw;
        struct sta_opmode_info sta_opmode = {};
        u32 changed = 0;
        u8 nss;

        /* ignore - no support for BF yet */
        if (opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)
                return 0;

        nss = opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
        nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
        nss += 1;

        if (link_sta->op_mode_nss != nss) {
                if (nss <= link_sta->capa_nss) {
                        link_sta->op_mode_nss = nss;

                        if (nss != link_sta->pub->rx_nss) {
                                link_sta->pub->rx_nss = nss;
                                changed |= IEEE80211_RC_NSS_CHANGED;
                                sta_opmode.rx_nss = link_sta->pub->rx_nss;
                                sta_opmode.changed |= STA_OPMODE_N_SS_CHANGED;
                        }
                } else {
                        sdata_dbg(sdata,
                                  "Ignore NSS change to invalid %d in VHT opmode notif from %pM",
                                  nss, link_sta->pub->addr);
                }
        }

        switch (opmode & IEEE80211_OPMODE_NOTIF_CHANWIDTH_MASK) {
        case IEEE80211_OPMODE_NOTIF_CHANWIDTH_20MHZ:
                /* ignore IEEE80211_OPMODE_NOTIF_BW_160_80P80 must not be set */
                link_sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_20;
                break;
        case IEEE80211_OPMODE_NOTIF_CHANWIDTH_40MHZ:
                /* ignore IEEE80211_OPMODE_NOTIF_BW_160_80P80 must not be set */
                link_sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_40;
                break;
        case IEEE80211_OPMODE_NOTIF_CHANWIDTH_80MHZ:
                if (opmode & IEEE80211_OPMODE_NOTIF_BW_160_80P80)
                        link_sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160;
                else
                        link_sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80;
                break;
        case IEEE80211_OPMODE_NOTIF_CHANWIDTH_160MHZ:
                /* legacy only, no longer used by newer spec */
                link_sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160;
                break;
        }

        new_bw = ieee80211_sta_cur_vht_bw(link_sta);
        if (new_bw != link_sta->pub->bandwidth) {
                link_sta->pub->bandwidth = new_bw;
                sta_opmode.bw = ieee80211_sta_rx_bw_to_chan_width(link_sta);
                changed |= IEEE80211_RC_BW_CHANGED;
                sta_opmode.changed |= STA_OPMODE_MAX_BW_CHANGED;
        }

        if (sta_opmode.changed)
                cfg80211_sta_opmode_change_notify(sdata->dev, link_sta->addr,
                                                  &sta_opmode, GFP_KERNEL);

        return changed;
}

void ieee80211_process_mu_groups(struct ieee80211_sub_if_data *sdata,
                                 struct ieee80211_link_data *link,
                                 struct ieee80211_mgmt *mgmt)
{
        struct ieee80211_bss_conf *link_conf = link->conf;

        if (!link_conf->mu_mimo_owner)
                return;

        if (!memcmp(mgmt->u.action.u.vht_group_notif.position,
                    link_conf->mu_group.position, WLAN_USER_POSITION_LEN) &&
            !memcmp(mgmt->u.action.u.vht_group_notif.membership,
                    link_conf->mu_group.membership, WLAN_MEMBERSHIP_LEN))
                return;

        memcpy(link_conf->mu_group.membership,
               mgmt->u.action.u.vht_group_notif.membership,
               WLAN_MEMBERSHIP_LEN);
        memcpy(link_conf->mu_group.position,
               mgmt->u.action.u.vht_group_notif.position,
               WLAN_USER_POSITION_LEN);

        ieee80211_link_info_change_notify(sdata, link,
                                          BSS_CHANGED_MU_GROUPS);
}

void ieee80211_update_mu_groups(struct ieee80211_vif *vif, unsigned int link_id,
                                const u8 *membership, const u8 *position)
{
        struct ieee80211_bss_conf *link_conf;

        rcu_read_lock();
        link_conf = rcu_dereference(vif->link_conf[link_id]);

        if (!WARN_ON_ONCE(!link_conf || !link_conf->mu_mimo_owner)) {
                memcpy(link_conf->mu_group.membership, membership,
                       WLAN_MEMBERSHIP_LEN);
                memcpy(link_conf->mu_group.position, position,
                       WLAN_USER_POSITION_LEN);
        }
        rcu_read_unlock();
}
EXPORT_SYMBOL_GPL(ieee80211_update_mu_groups);

void ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
                                 struct link_sta_info *link_sta,
                                 u8 opmode, enum nl80211_band band)
{
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];

        u32 changed = __ieee80211_vht_handle_opmode(sdata, link_sta,
                                                    opmode, band);

        if (changed > 0) {
                ieee80211_recalc_min_chandef(sdata, link_sta->link_id);
                rate_control_rate_update(local, sband, link_sta, changed);
        }
}

void ieee80211_get_vht_mask_from_cap(__le16 vht_cap,
                                     u16 vht_mask[NL80211_VHT_NSS_MAX])
{
        int i;
        u16 mask, cap = le16_to_cpu(vht_cap);

        for (i = 0; i < NL80211_VHT_NSS_MAX; i++) {
                mask = (cap >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
                switch (mask) {
                case IEEE80211_VHT_MCS_SUPPORT_0_7:
                        vht_mask[i] = 0x00FF;
                        break;
                case IEEE80211_VHT_MCS_SUPPORT_0_8:
                        vht_mask[i] = 0x01FF;
                        break;
                case IEEE80211_VHT_MCS_SUPPORT_0_9:
                        vht_mask[i] = 0x03FF;
                        break;
                case IEEE80211_VHT_MCS_NOT_SUPPORTED:
                default:
                        vht_mask[i] = 0;
                        break;
                }
        }
}