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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 | ||
dd5ecfea JB |
16 | static void __check_vhtcap_disable(struct ieee80211_sub_if_data *sdata, |
17 | struct ieee80211_sta_vht_cap *vht_cap, | |
18 | u32 flag) | |
19 | { | |
20 | __le32 le_flag = cpu_to_le32(flag); | |
21 | ||
22 | if (sdata->u.mgd.vht_capa_mask.vht_cap_info & le_flag && | |
23 | !(sdata->u.mgd.vht_capa.vht_cap_info & le_flag)) | |
24 | vht_cap->cap &= ~flag; | |
25 | } | |
26 | ||
27 | void ieee80211_apply_vhtcap_overrides(struct ieee80211_sub_if_data *sdata, | |
28 | struct ieee80211_sta_vht_cap *vht_cap) | |
29 | { | |
30 | int i; | |
31 | u16 rxmcs_mask, rxmcs_cap, rxmcs_n, txmcs_mask, txmcs_cap, txmcs_n; | |
32 | ||
33 | if (!vht_cap->vht_supported) | |
34 | return; | |
35 | ||
36 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
37 | return; | |
38 | ||
39 | __check_vhtcap_disable(sdata, vht_cap, | |
40 | IEEE80211_VHT_CAP_RXLDPC); | |
41 | __check_vhtcap_disable(sdata, vht_cap, | |
42 | IEEE80211_VHT_CAP_SHORT_GI_80); | |
43 | __check_vhtcap_disable(sdata, vht_cap, | |
44 | IEEE80211_VHT_CAP_SHORT_GI_160); | |
45 | __check_vhtcap_disable(sdata, vht_cap, | |
46 | IEEE80211_VHT_CAP_TXSTBC); | |
47 | __check_vhtcap_disable(sdata, vht_cap, | |
48 | IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE); | |
49 | __check_vhtcap_disable(sdata, vht_cap, | |
50 | IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE); | |
51 | __check_vhtcap_disable(sdata, vht_cap, | |
52 | IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN); | |
53 | __check_vhtcap_disable(sdata, vht_cap, | |
54 | IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN); | |
55 | ||
56 | /* Allow user to decrease AMPDU length exponent */ | |
57 | if (sdata->u.mgd.vht_capa_mask.vht_cap_info & | |
58 | cpu_to_le32(IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK)) { | |
59 | u32 cap, n; | |
60 | ||
61 | n = le32_to_cpu(sdata->u.mgd.vht_capa.vht_cap_info) & | |
62 | IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK; | |
63 | n >>= IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT; | |
64 | cap = vht_cap->cap & IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK; | |
65 | cap >>= IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT; | |
66 | ||
67 | if (n < cap) { | |
68 | vht_cap->cap &= | |
69 | ~IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK; | |
70 | vht_cap->cap |= | |
71 | n << IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT; | |
72 | } | |
73 | } | |
74 | ||
75 | /* Allow the user to decrease MCSes */ | |
76 | rxmcs_mask = | |
77 | le16_to_cpu(sdata->u.mgd.vht_capa_mask.supp_mcs.rx_mcs_map); | |
78 | rxmcs_n = le16_to_cpu(sdata->u.mgd.vht_capa.supp_mcs.rx_mcs_map); | |
79 | rxmcs_n &= rxmcs_mask; | |
80 | rxmcs_cap = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map); | |
81 | ||
82 | txmcs_mask = | |
83 | le16_to_cpu(sdata->u.mgd.vht_capa_mask.supp_mcs.tx_mcs_map); | |
84 | txmcs_n = le16_to_cpu(sdata->u.mgd.vht_capa.supp_mcs.tx_mcs_map); | |
85 | txmcs_n &= txmcs_mask; | |
86 | txmcs_cap = le16_to_cpu(vht_cap->vht_mcs.tx_mcs_map); | |
87 | for (i = 0; i < 8; i++) { | |
88 | u8 m, n, c; | |
89 | ||
90 | m = (rxmcs_mask >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED; | |
91 | n = (rxmcs_n >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED; | |
92 | c = (rxmcs_cap >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED; | |
93 | ||
94 | if (m && ((c != IEEE80211_VHT_MCS_NOT_SUPPORTED && n < c) || | |
95 | n == IEEE80211_VHT_MCS_NOT_SUPPORTED)) { | |
96 | rxmcs_cap &= ~(3 << 2*i); | |
97 | rxmcs_cap |= (rxmcs_n & (3 << 2*i)); | |
98 | } | |
99 | ||
100 | m = (txmcs_mask >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED; | |
101 | n = (txmcs_n >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED; | |
102 | c = (txmcs_cap >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED; | |
103 | ||
104 | if (m && ((c != IEEE80211_VHT_MCS_NOT_SUPPORTED && n < c) || | |
105 | n == IEEE80211_VHT_MCS_NOT_SUPPORTED)) { | |
106 | txmcs_cap &= ~(3 << 2*i); | |
107 | txmcs_cap |= (txmcs_n & (3 << 2*i)); | |
108 | } | |
109 | } | |
110 | vht_cap->vht_mcs.rx_mcs_map = cpu_to_le16(rxmcs_cap); | |
111 | vht_cap->vht_mcs.tx_mcs_map = cpu_to_le16(txmcs_cap); | |
112 | } | |
113 | ||
4a3cb702 JB |
114 | void |
115 | ieee80211_vht_cap_ie_to_sta_vht_cap(struct ieee80211_sub_if_data *sdata, | |
116 | struct ieee80211_supported_band *sband, | |
117 | const struct ieee80211_vht_cap *vht_cap_ie, | |
118 | struct sta_info *sta) | |
818255ea | 119 | { |
4a34215e | 120 | struct ieee80211_sta_vht_cap *vht_cap = &sta->sta.vht_cap; |
818255ea MP |
121 | |
122 | memset(vht_cap, 0, sizeof(*vht_cap)); | |
123 | ||
4a34215e JB |
124 | if (!sta->sta.ht_cap.ht_supported) |
125 | return; | |
126 | ||
818255ea MP |
127 | if (!vht_cap_ie || !sband->vht_cap.vht_supported) |
128 | return; | |
129 | ||
e1a0c6b3 JB |
130 | /* A VHT STA must support 40 MHz */ |
131 | if (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)) | |
132 | return; | |
133 | ||
818255ea MP |
134 | vht_cap->vht_supported = true; |
135 | ||
136 | vht_cap->cap = le32_to_cpu(vht_cap_ie->vht_cap_info); | |
137 | ||
138 | /* Copy peer MCS info, the driver might need them. */ | |
139 | memcpy(&vht_cap->vht_mcs, &vht_cap_ie->supp_mcs, | |
140 | sizeof(struct ieee80211_vht_mcs_info)); | |
e1a0c6b3 | 141 | |
0af83d3d JB |
142 | switch (vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) { |
143 | case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ: | |
144 | case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ: | |
145 | sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160; | |
146 | break; | |
147 | default: | |
148 | sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80; | |
149 | } | |
150 | ||
e1a0c6b3 JB |
151 | sta->sta.bandwidth = ieee80211_sta_cur_vht_bw(sta); |
152 | } | |
153 | ||
154 | enum ieee80211_sta_rx_bandwidth ieee80211_sta_cur_vht_bw(struct sta_info *sta) | |
155 | { | |
156 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
157 | u32 cap = sta->sta.vht_cap.cap; | |
0af83d3d | 158 | enum ieee80211_sta_rx_bandwidth bw; |
e1a0c6b3 | 159 | |
0af83d3d JB |
160 | if (!sta->sta.vht_cap.vht_supported) { |
161 | bw = sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ? | |
e1a0c6b3 | 162 | IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20; |
0af83d3d JB |
163 | goto check_max; |
164 | } | |
e1a0c6b3 JB |
165 | |
166 | switch (sdata->vif.bss_conf.chandef.width) { | |
167 | default: | |
168 | WARN_ON_ONCE(1); | |
169 | /* fall through */ | |
170 | case NL80211_CHAN_WIDTH_20_NOHT: | |
171 | case NL80211_CHAN_WIDTH_20: | |
172 | case NL80211_CHAN_WIDTH_40: | |
0af83d3d | 173 | bw = sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ? |
e1a0c6b3 | 174 | IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20; |
0af83d3d | 175 | break; |
e1a0c6b3 | 176 | case NL80211_CHAN_WIDTH_160: |
0af83d3d JB |
177 | if ((cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) == |
178 | IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ) { | |
179 | bw = IEEE80211_STA_RX_BW_160; | |
180 | break; | |
181 | } | |
e1a0c6b3 JB |
182 | /* fall through */ |
183 | case NL80211_CHAN_WIDTH_80P80: | |
0af83d3d JB |
184 | if ((cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) == |
185 | IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) { | |
186 | bw = IEEE80211_STA_RX_BW_160; | |
187 | break; | |
188 | } | |
e1a0c6b3 JB |
189 | /* fall through */ |
190 | case NL80211_CHAN_WIDTH_80: | |
0af83d3d | 191 | bw = IEEE80211_STA_RX_BW_80; |
e1a0c6b3 | 192 | } |
0af83d3d JB |
193 | |
194 | check_max: | |
195 | if (bw > sta->cur_max_bandwidth) | |
196 | bw = sta->cur_max_bandwidth; | |
197 | return bw; | |
818255ea | 198 | } |
8921d04e JB |
199 | |
200 | void ieee80211_sta_set_rx_nss(struct sta_info *sta) | |
201 | { | |
202 | u8 ht_rx_nss = 0, vht_rx_nss = 0; | |
203 | ||
204 | /* if we received a notification already don't overwrite it */ | |
205 | if (sta->sta.rx_nss) | |
206 | return; | |
207 | ||
208 | if (sta->sta.ht_cap.ht_supported) { | |
209 | if (sta->sta.ht_cap.mcs.rx_mask[0]) | |
210 | ht_rx_nss++; | |
211 | if (sta->sta.ht_cap.mcs.rx_mask[1]) | |
212 | ht_rx_nss++; | |
213 | if (sta->sta.ht_cap.mcs.rx_mask[2]) | |
214 | ht_rx_nss++; | |
215 | if (sta->sta.ht_cap.mcs.rx_mask[3]) | |
216 | ht_rx_nss++; | |
217 | /* FIXME: consider rx_highest? */ | |
218 | } | |
219 | ||
220 | if (sta->sta.vht_cap.vht_supported) { | |
221 | int i; | |
222 | u16 rx_mcs_map; | |
223 | ||
224 | rx_mcs_map = le16_to_cpu(sta->sta.vht_cap.vht_mcs.rx_mcs_map); | |
225 | ||
226 | for (i = 7; i >= 0; i--) { | |
227 | u8 mcs = (rx_mcs_map >> (2 * i)) & 3; | |
228 | ||
229 | if (mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED) { | |
230 | vht_rx_nss = i + 1; | |
231 | break; | |
232 | } | |
233 | } | |
234 | /* FIXME: consider rx_highest? */ | |
235 | } | |
236 | ||
237 | ht_rx_nss = max(ht_rx_nss, vht_rx_nss); | |
238 | sta->sta.rx_nss = max_t(u8, 1, ht_rx_nss); | |
239 | } | |
0af83d3d JB |
240 | |
241 | void ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata, | |
242 | struct sta_info *sta, u8 opmode, | |
bee7f586 | 243 | enum ieee80211_band band, bool nss_only) |
0af83d3d JB |
244 | { |
245 | struct ieee80211_local *local = sdata->local; | |
246 | struct ieee80211_supported_band *sband; | |
247 | enum ieee80211_sta_rx_bandwidth new_bw; | |
248 | u32 changed = 0; | |
249 | u8 nss; | |
250 | ||
251 | sband = local->hw.wiphy->bands[band]; | |
252 | ||
253 | /* ignore - no support for BF yet */ | |
254 | if (opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF) | |
255 | return; | |
256 | ||
257 | nss = opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK; | |
258 | nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT; | |
259 | nss += 1; | |
260 | ||
261 | if (sta->sta.rx_nss != nss) { | |
262 | sta->sta.rx_nss = nss; | |
263 | changed |= IEEE80211_RC_NSS_CHANGED; | |
264 | } | |
265 | ||
bee7f586 JB |
266 | if (nss_only) |
267 | goto change; | |
268 | ||
0af83d3d JB |
269 | switch (opmode & IEEE80211_OPMODE_NOTIF_CHANWIDTH_MASK) { |
270 | case IEEE80211_OPMODE_NOTIF_CHANWIDTH_20MHZ: | |
271 | sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_20; | |
272 | break; | |
273 | case IEEE80211_OPMODE_NOTIF_CHANWIDTH_40MHZ: | |
274 | sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_40; | |
275 | break; | |
276 | case IEEE80211_OPMODE_NOTIF_CHANWIDTH_80MHZ: | |
277 | sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80; | |
278 | break; | |
279 | case IEEE80211_OPMODE_NOTIF_CHANWIDTH_160MHZ: | |
280 | sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160; | |
281 | break; | |
282 | } | |
283 | ||
284 | new_bw = ieee80211_sta_cur_vht_bw(sta); | |
285 | if (new_bw != sta->sta.bandwidth) { | |
286 | sta->sta.bandwidth = new_bw; | |
287 | changed |= IEEE80211_RC_NSS_CHANGED; | |
288 | } | |
289 | ||
bee7f586 | 290 | change: |
0af83d3d JB |
291 | if (changed) |
292 | rate_control_rate_update(local, sband, sta, changed); | |
293 | } |