eht.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * EHT handling
  4 *
  5 * Copyright(c) 2021-2025 Intel Corporation
  6 */
  7
  8#include "ieee80211_i.h"
  9
 10void
 11ieee80211_eht_cap_ie_to_sta_eht_cap(struct ieee80211_sub_if_data *sdata,
 12				    struct ieee80211_supported_band *sband,
 13				    const u8 *he_cap_ie, u8 he_cap_len,
 14				    const struct ieee80211_eht_cap_elem *eht_cap_ie_elem,
 15				    u8 eht_cap_len,
 16				    struct link_sta_info *link_sta)
 17{
 18	struct ieee80211_sta_eht_cap *eht_cap = &link_sta->pub->eht_cap;
 19	struct ieee80211_he_cap_elem *he_cap_ie_elem = (void *)he_cap_ie;
 20	u8 eht_ppe_size = 0;
 21	u8 mcs_nss_size;
 22	u8 eht_total_size = sizeof(eht_cap->eht_cap_elem);
 23	u8 *pos = (u8 *)eht_cap_ie_elem;
 24
 25	memset(eht_cap, 0, sizeof(*eht_cap));
 26
 27	if (!eht_cap_ie_elem ||
 28	    !ieee80211_get_eht_iftype_cap_vif(sband, &sdata->vif))
 29		return;
 30
 31	mcs_nss_size = ieee80211_eht_mcs_nss_size(he_cap_ie_elem,
 32						  &eht_cap_ie_elem->fixed,
 33						  sdata->vif.type ==
 34							NL80211_IFTYPE_STATION);
 35
 36	eht_total_size += mcs_nss_size;
 37
 38	/* Calculate the PPE thresholds length only if the header is present */
 39	if (eht_cap_ie_elem->fixed.phy_cap_info[5] &
 40			IEEE80211_EHT_PHY_CAP5_PPE_THRESHOLD_PRESENT) {
 41		u16 eht_ppe_hdr;
 42
 43		if (eht_cap_len < eht_total_size + sizeof(u16))
 44			return;
 45
 46		eht_ppe_hdr = get_unaligned_le16(eht_cap_ie_elem->optional + mcs_nss_size);
 47		eht_ppe_size =
 48			ieee80211_eht_ppe_size(eht_ppe_hdr,
 49					       eht_cap_ie_elem->fixed.phy_cap_info);
 50		eht_total_size += eht_ppe_size;
 51
 52		/* we calculate as if NSS > 8 are valid, but don't handle that */
 53		if (eht_ppe_size > sizeof(eht_cap->eht_ppe_thres))
 54			return;
 55	}
 56
 57	if (eht_cap_len < eht_total_size)
 58		return;
 59
 60	/* Copy the static portion of the EHT capabilities */
 61	memcpy(&eht_cap->eht_cap_elem, pos, sizeof(eht_cap->eht_cap_elem));
 62	pos += sizeof(eht_cap->eht_cap_elem);
 63
 64	/* Copy MCS/NSS which depends on the peer capabilities */
 65	memset(&eht_cap->eht_mcs_nss_supp, 0,
 66	       sizeof(eht_cap->eht_mcs_nss_supp));
 67	memcpy(&eht_cap->eht_mcs_nss_supp, pos, mcs_nss_size);
 68
 69	if (eht_ppe_size)
 70		memcpy(eht_cap->eht_ppe_thres,
 71		       &eht_cap_ie_elem->optional[mcs_nss_size],
 72		       eht_ppe_size);
 73
 74	eht_cap->has_eht = true;
 75
 76	link_sta->cur_max_bandwidth = ieee80211_sta_cap_rx_bw(link_sta);
 77	link_sta->pub->bandwidth = ieee80211_sta_cur_vht_bw(link_sta);
 78
 79	/*
 80	 * The MPDU length bits are reserved on all but 2.4 GHz and get set via
 81	 * VHT (5 GHz) or HE (6 GHz) capabilities.
 82	 */
 83	if (sband->band != NL80211_BAND_2GHZ)
 84		return;
 85
 86	switch (u8_get_bits(eht_cap->eht_cap_elem.mac_cap_info[0],
 87			    IEEE80211_EHT_MAC_CAP0_MAX_MPDU_LEN_MASK)) {
 88	case IEEE80211_EHT_MAC_CAP0_MAX_MPDU_LEN_11454:
 89		link_sta->pub->agg.max_amsdu_len =
 90			IEEE80211_MAX_MPDU_LEN_VHT_11454;
 91		break;
 92	case IEEE80211_EHT_MAC_CAP0_MAX_MPDU_LEN_7991:
 93		link_sta->pub->agg.max_amsdu_len =
 94			IEEE80211_MAX_MPDU_LEN_VHT_7991;
 95		break;
 96	case IEEE80211_EHT_MAC_CAP0_MAX_MPDU_LEN_3895:
 97	default:
 98		link_sta->pub->agg.max_amsdu_len =
 99			IEEE80211_MAX_MPDU_LEN_VHT_3895;
100		break;
101	}
102
103	ieee80211_sta_recalc_aggregates(&link_sta->sta->sta);
104}