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Commit | Line | Data |
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818255ea MP |
1 | /* |
2 | * VHT handling | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | */ | |
8 | ||
9 | #include <linux/ieee80211.h> | |
10 | #include <linux/export.h> | |
11 | #include <net/mac80211.h> | |
12 | #include "ieee80211_i.h" | |
13 | ||
14 | ||
15 | void ieee80211_vht_cap_ie_to_sta_vht_cap(struct ieee80211_sub_if_data *sdata, | |
16 | struct ieee80211_supported_band *sband, | |
17 | struct ieee80211_vht_cap *vht_cap_ie, | |
4a34215e | 18 | struct sta_info *sta) |
818255ea | 19 | { |
4a34215e | 20 | struct ieee80211_sta_vht_cap *vht_cap = &sta->sta.vht_cap; |
818255ea MP |
21 | |
22 | memset(vht_cap, 0, sizeof(*vht_cap)); | |
23 | ||
4a34215e JB |
24 | if (!sta->sta.ht_cap.ht_supported) |
25 | return; | |
26 | ||
818255ea MP |
27 | if (!vht_cap_ie || !sband->vht_cap.vht_supported) |
28 | return; | |
29 | ||
e1a0c6b3 JB |
30 | /* A VHT STA must support 40 MHz */ |
31 | if (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)) | |
32 | return; | |
33 | ||
818255ea MP |
34 | vht_cap->vht_supported = true; |
35 | ||
36 | vht_cap->cap = le32_to_cpu(vht_cap_ie->vht_cap_info); | |
37 | ||
38 | /* Copy peer MCS info, the driver might need them. */ | |
39 | memcpy(&vht_cap->vht_mcs, &vht_cap_ie->supp_mcs, | |
40 | sizeof(struct ieee80211_vht_mcs_info)); | |
e1a0c6b3 JB |
41 | |
42 | sta->sta.bandwidth = ieee80211_sta_cur_vht_bw(sta); | |
43 | } | |
44 | ||
45 | enum ieee80211_sta_rx_bandwidth ieee80211_sta_cur_vht_bw(struct sta_info *sta) | |
46 | { | |
47 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
48 | u32 cap = sta->sta.vht_cap.cap; | |
49 | ||
50 | if (!sta->sta.vht_cap.vht_supported) | |
51 | return sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ? | |
52 | IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20; | |
53 | ||
54 | /* TODO: handle VHT opmode notification data */ | |
55 | ||
56 | switch (sdata->vif.bss_conf.chandef.width) { | |
57 | default: | |
58 | WARN_ON_ONCE(1); | |
59 | /* fall through */ | |
60 | case NL80211_CHAN_WIDTH_20_NOHT: | |
61 | case NL80211_CHAN_WIDTH_20: | |
62 | case NL80211_CHAN_WIDTH_40: | |
63 | return sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ? | |
64 | IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20; | |
65 | case NL80211_CHAN_WIDTH_160: | |
66 | if (cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ) | |
67 | return IEEE80211_STA_RX_BW_160; | |
68 | /* fall through */ | |
69 | case NL80211_CHAN_WIDTH_80P80: | |
70 | if (cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) | |
71 | return IEEE80211_STA_RX_BW_160; | |
72 | /* fall through */ | |
73 | case NL80211_CHAN_WIDTH_80: | |
74 | return IEEE80211_STA_RX_BW_80; | |
75 | } | |
818255ea | 76 | } |
8921d04e JB |
77 | |
78 | void ieee80211_sta_set_rx_nss(struct sta_info *sta) | |
79 | { | |
80 | u8 ht_rx_nss = 0, vht_rx_nss = 0; | |
81 | ||
82 | /* if we received a notification already don't overwrite it */ | |
83 | if (sta->sta.rx_nss) | |
84 | return; | |
85 | ||
86 | if (sta->sta.ht_cap.ht_supported) { | |
87 | if (sta->sta.ht_cap.mcs.rx_mask[0]) | |
88 | ht_rx_nss++; | |
89 | if (sta->sta.ht_cap.mcs.rx_mask[1]) | |
90 | ht_rx_nss++; | |
91 | if (sta->sta.ht_cap.mcs.rx_mask[2]) | |
92 | ht_rx_nss++; | |
93 | if (sta->sta.ht_cap.mcs.rx_mask[3]) | |
94 | ht_rx_nss++; | |
95 | /* FIXME: consider rx_highest? */ | |
96 | } | |
97 | ||
98 | if (sta->sta.vht_cap.vht_supported) { | |
99 | int i; | |
100 | u16 rx_mcs_map; | |
101 | ||
102 | rx_mcs_map = le16_to_cpu(sta->sta.vht_cap.vht_mcs.rx_mcs_map); | |
103 | ||
104 | for (i = 7; i >= 0; i--) { | |
105 | u8 mcs = (rx_mcs_map >> (2 * i)) & 3; | |
106 | ||
107 | if (mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED) { | |
108 | vht_rx_nss = i + 1; | |
109 | break; | |
110 | } | |
111 | } | |
112 | /* FIXME: consider rx_highest? */ | |
113 | } | |
114 | ||
115 | ht_rx_nss = max(ht_rx_nss, vht_rx_nss); | |
116 | sta->sta.rx_nss = max_t(u8, 1, ht_rx_nss); | |
117 | } |