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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * EHT handling
4 *
5 * Copyright(c) 2021-2026 Intel Corporation
6 */
7
8#include "driver-ops.h"
9#include "ieee80211_i.h"
10
11void
12ieee80211_eht_cap_ie_to_sta_eht_cap(struct ieee80211_sub_if_data *sdata,
13 struct ieee80211_supported_band *sband,
14 const u8 *he_cap_ie, u8 he_cap_len,
15 const struct ieee80211_eht_cap_elem *eht_cap_ie_elem,
16 u8 eht_cap_len,
17 struct link_sta_info *link_sta)
18{
19 struct ieee80211_sta_eht_cap *eht_cap = &link_sta->pub->eht_cap;
20 struct ieee80211_he_cap_elem *he_cap_ie_elem = (void *)he_cap_ie;
21 u8 eht_ppe_size = 0;
22 u8 mcs_nss_size;
23 u8 eht_total_size = sizeof(eht_cap->eht_cap_elem);
24 u8 *pos = (u8 *)eht_cap_ie_elem;
25
26 memset(eht_cap, 0, sizeof(*eht_cap));
27
28 if (!eht_cap_ie_elem ||
29 !ieee80211_get_eht_iftype_cap_vif(sband, &sdata->vif))
30 return;
31
32 mcs_nss_size = ieee80211_eht_mcs_nss_size(he_cap_ie_elem,
33 &eht_cap_ie_elem->fixed,
34 sdata->vif.type ==
35 NL80211_IFTYPE_STATION);
36
37 eht_total_size += mcs_nss_size;
38
39 /* Calculate the PPE thresholds length only if the header is present */
40 if (eht_cap_ie_elem->fixed.phy_cap_info[5] &
41 IEEE80211_EHT_PHY_CAP5_PPE_THRESHOLD_PRESENT) {
42 u16 eht_ppe_hdr;
43
44 if (eht_cap_len < eht_total_size + sizeof(u16))
45 return;
46
47 eht_ppe_hdr = get_unaligned_le16(eht_cap_ie_elem->optional + mcs_nss_size);
48 eht_ppe_size =
49 ieee80211_eht_ppe_size(eht_ppe_hdr,
50 eht_cap_ie_elem->fixed.phy_cap_info);
51 eht_total_size += eht_ppe_size;
52
53 /* we calculate as if NSS > 8 are valid, but don't handle that */
54 if (eht_ppe_size > sizeof(eht_cap->eht_ppe_thres))
55 return;
56 }
57
58 if (eht_cap_len < eht_total_size)
59 return;
60
61 /* Copy the static portion of the EHT capabilities */
62 memcpy(&eht_cap->eht_cap_elem, pos, sizeof(eht_cap->eht_cap_elem));
63 pos += sizeof(eht_cap->eht_cap_elem);
64
65 /* Copy MCS/NSS which depends on the peer capabilities */
66 memset(&eht_cap->eht_mcs_nss_supp, 0,
67 sizeof(eht_cap->eht_mcs_nss_supp));
68 memcpy(&eht_cap->eht_mcs_nss_supp, pos, mcs_nss_size);
69
70 if (eht_ppe_size)
71 memcpy(eht_cap->eht_ppe_thres,
72 &eht_cap_ie_elem->optional[mcs_nss_size],
73 eht_ppe_size);
74
75 eht_cap->has_eht = true;
76
77 /*
78 * The MPDU length bits are reserved on all but 2.4 GHz and get set via
79 * VHT (5 GHz) or HE (6 GHz) capabilities.
80 */
81 if (sband->band != NL80211_BAND_2GHZ)
82 return;
83
84 switch (u8_get_bits(eht_cap->eht_cap_elem.mac_cap_info[0],
85 IEEE80211_EHT_MAC_CAP0_MAX_MPDU_LEN_MASK)) {
86 case IEEE80211_EHT_MAC_CAP0_MAX_MPDU_LEN_11454:
87 link_sta->pub->agg.max_amsdu_len =
88 IEEE80211_MAX_MPDU_LEN_VHT_11454;
89 break;
90 case IEEE80211_EHT_MAC_CAP0_MAX_MPDU_LEN_7991:
91 link_sta->pub->agg.max_amsdu_len =
92 IEEE80211_MAX_MPDU_LEN_VHT_7991;
93 break;
94 case IEEE80211_EHT_MAC_CAP0_MAX_MPDU_LEN_3895:
95 default:
96 link_sta->pub->agg.max_amsdu_len =
97 IEEE80211_MAX_MPDU_LEN_VHT_3895;
98 break;
99 }
100
101 ieee80211_sta_recalc_aggregates(&link_sta->sta->sta);
102}