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" | |
0af83d3d | 13 | #include "rate.h" |
818255ea MP |
14 | |
15 | ||
4a3cb702 JB |
16 | void |
17 | ieee80211_vht_cap_ie_to_sta_vht_cap(struct ieee80211_sub_if_data *sdata, | |
18 | struct ieee80211_supported_band *sband, | |
19 | const struct ieee80211_vht_cap *vht_cap_ie, | |
20 | struct sta_info *sta) | |
818255ea | 21 | { |
4a34215e | 22 | struct ieee80211_sta_vht_cap *vht_cap = &sta->sta.vht_cap; |
818255ea MP |
23 | |
24 | memset(vht_cap, 0, sizeof(*vht_cap)); | |
25 | ||
4a34215e JB |
26 | if (!sta->sta.ht_cap.ht_supported) |
27 | return; | |
28 | ||
818255ea MP |
29 | if (!vht_cap_ie || !sband->vht_cap.vht_supported) |
30 | return; | |
31 | ||
e1a0c6b3 JB |
32 | /* A VHT STA must support 40 MHz */ |
33 | if (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)) | |
34 | return; | |
35 | ||
818255ea MP |
36 | vht_cap->vht_supported = true; |
37 | ||
38 | vht_cap->cap = le32_to_cpu(vht_cap_ie->vht_cap_info); | |
39 | ||
40 | /* Copy peer MCS info, the driver might need them. */ | |
41 | memcpy(&vht_cap->vht_mcs, &vht_cap_ie->supp_mcs, | |
42 | sizeof(struct ieee80211_vht_mcs_info)); | |
e1a0c6b3 | 43 | |
0af83d3d JB |
44 | switch (vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) { |
45 | case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ: | |
46 | case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ: | |
47 | sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160; | |
48 | break; | |
49 | default: | |
50 | sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80; | |
51 | } | |
52 | ||
e1a0c6b3 JB |
53 | sta->sta.bandwidth = ieee80211_sta_cur_vht_bw(sta); |
54 | } | |
55 | ||
56 | enum ieee80211_sta_rx_bandwidth ieee80211_sta_cur_vht_bw(struct sta_info *sta) | |
57 | { | |
58 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
59 | u32 cap = sta->sta.vht_cap.cap; | |
0af83d3d | 60 | enum ieee80211_sta_rx_bandwidth bw; |
e1a0c6b3 | 61 | |
0af83d3d JB |
62 | if (!sta->sta.vht_cap.vht_supported) { |
63 | bw = sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ? | |
e1a0c6b3 | 64 | IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20; |
0af83d3d JB |
65 | goto check_max; |
66 | } | |
e1a0c6b3 JB |
67 | |
68 | switch (sdata->vif.bss_conf.chandef.width) { | |
69 | default: | |
70 | WARN_ON_ONCE(1); | |
71 | /* fall through */ | |
72 | case NL80211_CHAN_WIDTH_20_NOHT: | |
73 | case NL80211_CHAN_WIDTH_20: | |
74 | case NL80211_CHAN_WIDTH_40: | |
0af83d3d | 75 | bw = sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ? |
e1a0c6b3 | 76 | IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20; |
0af83d3d | 77 | break; |
e1a0c6b3 | 78 | case NL80211_CHAN_WIDTH_160: |
0af83d3d JB |
79 | if ((cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) == |
80 | IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ) { | |
81 | bw = IEEE80211_STA_RX_BW_160; | |
82 | break; | |
83 | } | |
e1a0c6b3 JB |
84 | /* fall through */ |
85 | case NL80211_CHAN_WIDTH_80P80: | |
0af83d3d JB |
86 | if ((cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) == |
87 | IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) { | |
88 | bw = IEEE80211_STA_RX_BW_160; | |
89 | break; | |
90 | } | |
e1a0c6b3 JB |
91 | /* fall through */ |
92 | case NL80211_CHAN_WIDTH_80: | |
0af83d3d | 93 | bw = IEEE80211_STA_RX_BW_80; |
e1a0c6b3 | 94 | } |
0af83d3d JB |
95 | |
96 | check_max: | |
97 | if (bw > sta->cur_max_bandwidth) | |
98 | bw = sta->cur_max_bandwidth; | |
99 | return bw; | |
818255ea | 100 | } |
8921d04e JB |
101 | |
102 | void ieee80211_sta_set_rx_nss(struct sta_info *sta) | |
103 | { | |
104 | u8 ht_rx_nss = 0, vht_rx_nss = 0; | |
105 | ||
106 | /* if we received a notification already don't overwrite it */ | |
107 | if (sta->sta.rx_nss) | |
108 | return; | |
109 | ||
110 | if (sta->sta.ht_cap.ht_supported) { | |
111 | if (sta->sta.ht_cap.mcs.rx_mask[0]) | |
112 | ht_rx_nss++; | |
113 | if (sta->sta.ht_cap.mcs.rx_mask[1]) | |
114 | ht_rx_nss++; | |
115 | if (sta->sta.ht_cap.mcs.rx_mask[2]) | |
116 | ht_rx_nss++; | |
117 | if (sta->sta.ht_cap.mcs.rx_mask[3]) | |
118 | ht_rx_nss++; | |
119 | /* FIXME: consider rx_highest? */ | |
120 | } | |
121 | ||
122 | if (sta->sta.vht_cap.vht_supported) { | |
123 | int i; | |
124 | u16 rx_mcs_map; | |
125 | ||
126 | rx_mcs_map = le16_to_cpu(sta->sta.vht_cap.vht_mcs.rx_mcs_map); | |
127 | ||
128 | for (i = 7; i >= 0; i--) { | |
129 | u8 mcs = (rx_mcs_map >> (2 * i)) & 3; | |
130 | ||
131 | if (mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED) { | |
132 | vht_rx_nss = i + 1; | |
133 | break; | |
134 | } | |
135 | } | |
136 | /* FIXME: consider rx_highest? */ | |
137 | } | |
138 | ||
139 | ht_rx_nss = max(ht_rx_nss, vht_rx_nss); | |
140 | sta->sta.rx_nss = max_t(u8, 1, ht_rx_nss); | |
141 | } | |
0af83d3d JB |
142 | |
143 | void ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata, | |
144 | struct sta_info *sta, u8 opmode, | |
bee7f586 | 145 | enum ieee80211_band band, bool nss_only) |
0af83d3d JB |
146 | { |
147 | struct ieee80211_local *local = sdata->local; | |
148 | struct ieee80211_supported_band *sband; | |
149 | enum ieee80211_sta_rx_bandwidth new_bw; | |
150 | u32 changed = 0; | |
151 | u8 nss; | |
152 | ||
153 | sband = local->hw.wiphy->bands[band]; | |
154 | ||
155 | /* ignore - no support for BF yet */ | |
156 | if (opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF) | |
157 | return; | |
158 | ||
159 | nss = opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK; | |
160 | nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT; | |
161 | nss += 1; | |
162 | ||
163 | if (sta->sta.rx_nss != nss) { | |
164 | sta->sta.rx_nss = nss; | |
165 | changed |= IEEE80211_RC_NSS_CHANGED; | |
166 | } | |
167 | ||
bee7f586 JB |
168 | if (nss_only) |
169 | goto change; | |
170 | ||
0af83d3d JB |
171 | switch (opmode & IEEE80211_OPMODE_NOTIF_CHANWIDTH_MASK) { |
172 | case IEEE80211_OPMODE_NOTIF_CHANWIDTH_20MHZ: | |
173 | sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_20; | |
174 | break; | |
175 | case IEEE80211_OPMODE_NOTIF_CHANWIDTH_40MHZ: | |
176 | sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_40; | |
177 | break; | |
178 | case IEEE80211_OPMODE_NOTIF_CHANWIDTH_80MHZ: | |
179 | sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80; | |
180 | break; | |
181 | case IEEE80211_OPMODE_NOTIF_CHANWIDTH_160MHZ: | |
182 | sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160; | |
183 | break; | |
184 | } | |
185 | ||
186 | new_bw = ieee80211_sta_cur_vht_bw(sta); | |
187 | if (new_bw != sta->sta.bandwidth) { | |
188 | sta->sta.bandwidth = new_bw; | |
189 | changed |= IEEE80211_RC_NSS_CHANGED; | |
190 | } | |
191 | ||
bee7f586 | 192 | change: |
0af83d3d JB |
193 | if (changed) |
194 | rate_control_rate_update(local, sband, sta, changed); | |
195 | } |