1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * EHT handling
 4 *
 5 * Copyright(c) 2021-2024 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	switch (u8_get_bits(eht_cap->eht_cap_elem.mac_cap_info[0],
80			    IEEE80211_EHT_MAC_CAP0_MAX_MPDU_LEN_MASK)) {
81	case IEEE80211_EHT_MAC_CAP0_MAX_MPDU_LEN_11454:
82		link_sta->pub->agg.max_amsdu_len =
83			IEEE80211_MAX_MPDU_LEN_VHT_11454;
84		break;
85	case IEEE80211_EHT_MAC_CAP0_MAX_MPDU_LEN_7991:
86		link_sta->pub->agg.max_amsdu_len =
87			IEEE80211_MAX_MPDU_LEN_VHT_7991;
88		break;
89	case IEEE80211_EHT_MAC_CAP0_MAX_MPDU_LEN_3895:
90	default:
91		link_sta->pub->agg.max_amsdu_len =
92			IEEE80211_MAX_MPDU_LEN_VHT_3895;
93		break;
94	}
95
96	ieee80211_sta_recalc_aggregates(&link_sta->sta->sta);
97}