1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * HE handling
4  *
5  * Copyright(c) 2017 Intel Deutschland GmbH
6  * Copyright(c) 2019 - 2023 Intel Corporation
7  */
8 
9 #include "ieee80211_i.h"
10 
11 static void
ieee80211_update_from_he_6ghz_capa(const struct ieee80211_he_6ghz_capa * he_6ghz_capa,struct link_sta_info * link_sta)12 ieee80211_update_from_he_6ghz_capa(const struct ieee80211_he_6ghz_capa *he_6ghz_capa,
13 				   struct link_sta_info *link_sta)
14 {
15 	struct sta_info *sta = link_sta->sta;
16 	enum ieee80211_smps_mode smps_mode;
17 
18 	if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
19 	    sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
20 		switch (le16_get_bits(he_6ghz_capa->capa,
21 				      IEEE80211_HE_6GHZ_CAP_SM_PS)) {
22 		case WLAN_HT_CAP_SM_PS_INVALID:
23 		case WLAN_HT_CAP_SM_PS_STATIC:
24 			smps_mode = IEEE80211_SMPS_STATIC;
25 			break;
26 		case WLAN_HT_CAP_SM_PS_DYNAMIC:
27 			smps_mode = IEEE80211_SMPS_DYNAMIC;
28 			break;
29 		case WLAN_HT_CAP_SM_PS_DISABLED:
30 			smps_mode = IEEE80211_SMPS_OFF;
31 			break;
32 		}
33 
34 		link_sta->pub->smps_mode = smps_mode;
35 	} else {
36 		link_sta->pub->smps_mode = IEEE80211_SMPS_OFF;
37 	}
38 
39 	switch (le16_get_bits(he_6ghz_capa->capa,
40 			      IEEE80211_HE_6GHZ_CAP_MAX_MPDU_LEN)) {
41 	case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454:
42 		link_sta->pub->agg.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_11454;
43 		break;
44 	case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_7991:
45 		link_sta->pub->agg.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_7991;
46 		break;
47 	case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_3895:
48 	default:
49 		link_sta->pub->agg.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_3895;
50 		break;
51 	}
52 
53 	ieee80211_sta_recalc_aggregates(&sta->sta);
54 
55 	link_sta->pub->he_6ghz_capa = *he_6ghz_capa;
56 }
57 
ieee80211_he_mcs_disable(__le16 * he_mcs)58 static void ieee80211_he_mcs_disable(__le16 *he_mcs)
59 {
60 	u32 i;
61 
62 	for (i = 0; i < 8; i++)
63 		*he_mcs |= cpu_to_le16(IEEE80211_HE_MCS_NOT_SUPPORTED << i * 2);
64 }
65 
ieee80211_he_mcs_intersection(__le16 * he_own_rx,__le16 * he_peer_rx,__le16 * he_own_tx,__le16 * he_peer_tx)66 static void ieee80211_he_mcs_intersection(__le16 *he_own_rx, __le16 *he_peer_rx,
67 					  __le16 *he_own_tx, __le16 *he_peer_tx)
68 {
69 	u32 i;
70 	u16 own_rx, own_tx, peer_rx, peer_tx;
71 
72 	for (i = 0; i < 8; i++) {
73 		own_rx = le16_to_cpu(*he_own_rx);
74 		own_rx = (own_rx >> i * 2) & IEEE80211_HE_MCS_NOT_SUPPORTED;
75 
76 		own_tx = le16_to_cpu(*he_own_tx);
77 		own_tx = (own_tx >> i * 2) & IEEE80211_HE_MCS_NOT_SUPPORTED;
78 
79 		peer_rx = le16_to_cpu(*he_peer_rx);
80 		peer_rx = (peer_rx >> i * 2) & IEEE80211_HE_MCS_NOT_SUPPORTED;
81 
82 		peer_tx = le16_to_cpu(*he_peer_tx);
83 		peer_tx = (peer_tx >> i * 2) & IEEE80211_HE_MCS_NOT_SUPPORTED;
84 
85 		if (peer_tx != IEEE80211_HE_MCS_NOT_SUPPORTED) {
86 			if (own_rx == IEEE80211_HE_MCS_NOT_SUPPORTED)
87 				peer_tx = IEEE80211_HE_MCS_NOT_SUPPORTED;
88 			else if (own_rx < peer_tx)
89 				peer_tx = own_rx;
90 		}
91 
92 		if (peer_rx != IEEE80211_HE_MCS_NOT_SUPPORTED) {
93 			if (own_tx == IEEE80211_HE_MCS_NOT_SUPPORTED)
94 				peer_rx = IEEE80211_HE_MCS_NOT_SUPPORTED;
95 			else if (own_tx < peer_rx)
96 				peer_rx = own_tx;
97 		}
98 
99 		*he_peer_rx &=
100 			~cpu_to_le16(IEEE80211_HE_MCS_NOT_SUPPORTED << i * 2);
101 		*he_peer_rx |= cpu_to_le16(peer_rx << i * 2);
102 
103 		*he_peer_tx &=
104 			~cpu_to_le16(IEEE80211_HE_MCS_NOT_SUPPORTED << i * 2);
105 		*he_peer_tx |= cpu_to_le16(peer_tx << i * 2);
106 	}
107 }
108 
109 void
ieee80211_he_cap_ie_to_sta_he_cap(struct ieee80211_sub_if_data * sdata,struct ieee80211_supported_band * sband,const u8 * he_cap_ie,u8 he_cap_len,const struct ieee80211_he_6ghz_capa * he_6ghz_capa,struct link_sta_info * link_sta)110 ieee80211_he_cap_ie_to_sta_he_cap(struct ieee80211_sub_if_data *sdata,
111 				  struct ieee80211_supported_band *sband,
112 				  const u8 *he_cap_ie, u8 he_cap_len,
113 				  const struct ieee80211_he_6ghz_capa *he_6ghz_capa,
114 				  struct link_sta_info *link_sta)
115 {
116 	struct ieee80211_sta_he_cap *he_cap = &link_sta->pub->he_cap;
117 	const struct ieee80211_sta_he_cap *own_he_cap_ptr;
118 	struct ieee80211_sta_he_cap own_he_cap;
119 	struct ieee80211_he_cap_elem *he_cap_ie_elem = (void *)he_cap_ie;
120 	u8 he_ppe_size;
121 	u8 mcs_nss_size;
122 	u8 he_total_size;
123 	bool own_160, peer_160, own_80p80, peer_80p80;
124 
125 	memset(he_cap, 0, sizeof(*he_cap));
126 
127 	if (!he_cap_ie)
128 		return;
129 
130 	own_he_cap_ptr =
131 		ieee80211_get_he_iftype_cap_vif(sband, &sdata->vif);
132 	if (!own_he_cap_ptr)
133 		return;
134 
135 	own_he_cap = *own_he_cap_ptr;
136 
137 	/* Make sure size is OK */
138 	mcs_nss_size = ieee80211_he_mcs_nss_size(he_cap_ie_elem);
139 	he_ppe_size =
140 		ieee80211_he_ppe_size(he_cap_ie[sizeof(he_cap->he_cap_elem) +
141 						mcs_nss_size],
142 				      he_cap_ie_elem->phy_cap_info);
143 	he_total_size = sizeof(he_cap->he_cap_elem) + mcs_nss_size +
144 			he_ppe_size;
145 	if (he_cap_len < he_total_size)
146 		return;
147 
148 	memcpy(&he_cap->he_cap_elem, he_cap_ie, sizeof(he_cap->he_cap_elem));
149 
150 	/* HE Tx/Rx HE MCS NSS Support Field */
151 	memcpy(&he_cap->he_mcs_nss_supp,
152 	       &he_cap_ie[sizeof(he_cap->he_cap_elem)], mcs_nss_size);
153 
154 	/* Check if there are (optional) PPE Thresholds */
155 	if (he_cap->he_cap_elem.phy_cap_info[6] &
156 	    IEEE80211_HE_PHY_CAP6_PPE_THRESHOLD_PRESENT)
157 		memcpy(he_cap->ppe_thres,
158 		       &he_cap_ie[sizeof(he_cap->he_cap_elem) + mcs_nss_size],
159 		       he_ppe_size);
160 
161 	he_cap->has_he = true;
162 
163 	link_sta->cur_max_bandwidth = ieee80211_sta_cap_rx_bw(link_sta);
164 	link_sta->pub->bandwidth = ieee80211_sta_cur_vht_bw(link_sta);
165 
166 	if (sband->band == NL80211_BAND_6GHZ && he_6ghz_capa)
167 		ieee80211_update_from_he_6ghz_capa(he_6ghz_capa, link_sta);
168 
169 	ieee80211_he_mcs_intersection(&own_he_cap.he_mcs_nss_supp.rx_mcs_80,
170 				      &he_cap->he_mcs_nss_supp.rx_mcs_80,
171 				      &own_he_cap.he_mcs_nss_supp.tx_mcs_80,
172 				      &he_cap->he_mcs_nss_supp.tx_mcs_80);
173 
174 	own_160 = own_he_cap.he_cap_elem.phy_cap_info[0] &
175 		  IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_160MHZ_IN_5G;
176 	peer_160 = he_cap->he_cap_elem.phy_cap_info[0] &
177 		   IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_160MHZ_IN_5G;
178 
179 	if (peer_160 && own_160) {
180 		ieee80211_he_mcs_intersection(&own_he_cap.he_mcs_nss_supp.rx_mcs_160,
181 					      &he_cap->he_mcs_nss_supp.rx_mcs_160,
182 					      &own_he_cap.he_mcs_nss_supp.tx_mcs_160,
183 					      &he_cap->he_mcs_nss_supp.tx_mcs_160);
184 	} else if (peer_160 && !own_160) {
185 		ieee80211_he_mcs_disable(&he_cap->he_mcs_nss_supp.rx_mcs_160);
186 		ieee80211_he_mcs_disable(&he_cap->he_mcs_nss_supp.tx_mcs_160);
187 		he_cap->he_cap_elem.phy_cap_info[0] &=
188 			~IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_160MHZ_IN_5G;
189 	}
190 
191 	own_80p80 = own_he_cap.he_cap_elem.phy_cap_info[0] &
192 		    IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_80PLUS80_MHZ_IN_5G;
193 	peer_80p80 = he_cap->he_cap_elem.phy_cap_info[0] &
194 		     IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_80PLUS80_MHZ_IN_5G;
195 
196 	if (peer_80p80 && own_80p80) {
197 		ieee80211_he_mcs_intersection(&own_he_cap.he_mcs_nss_supp.rx_mcs_80p80,
198 					      &he_cap->he_mcs_nss_supp.rx_mcs_80p80,
199 					      &own_he_cap.he_mcs_nss_supp.tx_mcs_80p80,
200 					      &he_cap->he_mcs_nss_supp.tx_mcs_80p80);
201 	} else if (peer_80p80 && !own_80p80) {
202 		ieee80211_he_mcs_disable(&he_cap->he_mcs_nss_supp.rx_mcs_80p80);
203 		ieee80211_he_mcs_disable(&he_cap->he_mcs_nss_supp.tx_mcs_80p80);
204 		he_cap->he_cap_elem.phy_cap_info[0] &=
205 			~IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_80PLUS80_MHZ_IN_5G;
206 	}
207 }
208 
209 void
ieee80211_he_op_ie_to_bss_conf(struct ieee80211_vif * vif,const struct ieee80211_he_operation * he_op_ie)210 ieee80211_he_op_ie_to_bss_conf(struct ieee80211_vif *vif,
211 			const struct ieee80211_he_operation *he_op_ie)
212 {
213 	memset(&vif->bss_conf.he_oper, 0, sizeof(vif->bss_conf.he_oper));
214 	if (!he_op_ie)
215 		return;
216 
217 	vif->bss_conf.he_oper.params = __le32_to_cpu(he_op_ie->he_oper_params);
218 	vif->bss_conf.he_oper.nss_set = __le16_to_cpu(he_op_ie->he_mcs_nss_set);
219 }
220 
221 void
ieee80211_he_spr_ie_to_bss_conf(struct ieee80211_vif * vif,const struct ieee80211_he_spr * he_spr_ie_elem)222 ieee80211_he_spr_ie_to_bss_conf(struct ieee80211_vif *vif,
223 				const struct ieee80211_he_spr *he_spr_ie_elem)
224 {
225 	struct ieee80211_he_obss_pd *he_obss_pd =
226 					&vif->bss_conf.he_obss_pd;
227 	const u8 *data;
228 
229 	memset(he_obss_pd, 0, sizeof(*he_obss_pd));
230 
231 	if (!he_spr_ie_elem)
232 		return;
233 	data = he_spr_ie_elem->optional;
234 
235 	if (he_spr_ie_elem->he_sr_control &
236 	    IEEE80211_HE_SPR_NON_SRG_OFFSET_PRESENT)
237 		data++;
238 	if (he_spr_ie_elem->he_sr_control &
239 	    IEEE80211_HE_SPR_SRG_INFORMATION_PRESENT) {
240 		he_obss_pd->max_offset = *data++;
241 		he_obss_pd->min_offset = *data++;
242 		he_obss_pd->enable = true;
243 	}
244 }
245