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, vif: &sdata->vif))
29 return;
30
31 mcs_nss_size = ieee80211_eht_mcs_nss_size(he_cap: he_cap_ie_elem,
32 eht_cap: &eht_cap_ie_elem->fixed,
33 from_ap: 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(p: eht_cap_ie_elem->optional + mcs_nss_size);
47 eht_ppe_size =
48 ieee80211_eht_ppe_size(ppe_thres_hdr: eht_ppe_hdr,
49 phy_cap_info: 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(v: 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(pubsta: &link_sta->sta->sta);
104}
105

source code of linux/net/mac80211/eht.c