// SPDX-License-Identifier: GPL-2.0-only
/*
 * EHT handling
 *
 * Copyright(c) 2021-2026 Intel Corporation
 */

#include "driver-ops.h"
#include "ieee80211_i.h"

void
ieee80211_eht_cap_ie_to_sta_eht_cap(struct ieee80211_sub_if_data *sdata,
                                    struct ieee80211_supported_band *sband,
                                    const u8 *he_cap_ie, u8 he_cap_len,
                                    const struct ieee80211_eht_cap_elem *eht_cap_ie_elem,
                                    u8 eht_cap_len,
                                    struct link_sta_info *link_sta)
{
        struct ieee80211_sta_eht_cap *eht_cap = &link_sta->pub->eht_cap;
        struct ieee80211_he_cap_elem *he_cap_ie_elem = (void *)he_cap_ie;
        u8 eht_ppe_size = 0;
        u8 mcs_nss_size;
        u8 eht_total_size = sizeof(eht_cap->eht_cap_elem);
        u8 *pos = (u8 *)eht_cap_ie_elem;

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

        if (!eht_cap_ie_elem ||
            !ieee80211_get_eht_iftype_cap_vif(sband, &sdata->vif))
                return;

        mcs_nss_size = ieee80211_eht_mcs_nss_size(he_cap_ie_elem,
                                                  &eht_cap_ie_elem->fixed,
                                                  sdata->vif.type ==
                                                        NL80211_IFTYPE_STATION);

        eht_total_size += mcs_nss_size;

        /* Calculate the PPE thresholds length only if the header is present */
        if (eht_cap_ie_elem->fixed.phy_cap_info[5] &
                        IEEE80211_EHT_PHY_CAP5_PPE_THRESHOLD_PRESENT) {
                u16 eht_ppe_hdr;

                if (eht_cap_len < eht_total_size + sizeof(u16))
                        return;

                eht_ppe_hdr = get_unaligned_le16(eht_cap_ie_elem->optional + mcs_nss_size);
                eht_ppe_size =
                        ieee80211_eht_ppe_size(eht_ppe_hdr,
                                               eht_cap_ie_elem->fixed.phy_cap_info);
                eht_total_size += eht_ppe_size;

                /* we calculate as if NSS > 8 are valid, but don't handle that */
                if (eht_ppe_size > sizeof(eht_cap->eht_ppe_thres))
                        return;
        }

        if (eht_cap_len < eht_total_size)
                return;

        /* Copy the static portion of the EHT capabilities */
        memcpy(&eht_cap->eht_cap_elem, pos, sizeof(eht_cap->eht_cap_elem));
        pos += sizeof(eht_cap->eht_cap_elem);

        /* Copy MCS/NSS which depends on the peer capabilities */
        memset(&eht_cap->eht_mcs_nss_supp, 0,
               sizeof(eht_cap->eht_mcs_nss_supp));
        memcpy(&eht_cap->eht_mcs_nss_supp, pos, mcs_nss_size);

        if (eht_ppe_size)
                memcpy(eht_cap->eht_ppe_thres,
                       &eht_cap_ie_elem->optional[mcs_nss_size],
                       eht_ppe_size);

        eht_cap->has_eht = true;

        /*
         * The MPDU length bits are reserved on all but 2.4 GHz and get set via
         * VHT (5 GHz) or HE (6 GHz) capabilities.
         */
        if (sband->band != NL80211_BAND_2GHZ)
                return;

        switch (u8_get_bits(eht_cap->eht_cap_elem.mac_cap_info[0],
                            IEEE80211_EHT_MAC_CAP0_MAX_MPDU_LEN_MASK)) {
        case IEEE80211_EHT_MAC_CAP0_MAX_MPDU_LEN_11454:
                link_sta->pub->agg.max_amsdu_len =
                        IEEE80211_MAX_MPDU_LEN_VHT_11454;
                break;
        case IEEE80211_EHT_MAC_CAP0_MAX_MPDU_LEN_7991:
                link_sta->pub->agg.max_amsdu_len =
                        IEEE80211_MAX_MPDU_LEN_VHT_7991;
                break;
        case IEEE80211_EHT_MAC_CAP0_MAX_MPDU_LEN_3895:
        default:
                link_sta->pub->agg.max_amsdu_len =
                        IEEE80211_MAX_MPDU_LEN_VHT_3895;
                break;
        }

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