1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * EHT handling
4 *
5 * Copyright(c) 2021-2025 Intel Corporation
6 */
7
8 #include "driver-ops.h"
9 #include "ieee80211_i.h"
10
11 void
ieee80211_eht_cap_ie_to_sta_eht_cap(struct ieee80211_sub_if_data * sdata,struct ieee80211_supported_band * sband,const u8 * he_cap_ie,u8 he_cap_len,const struct ieee80211_eht_cap_elem * eht_cap_ie_elem,u8 eht_cap_len,struct link_sta_info * link_sta)12 ieee80211_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 link_sta->cur_max_bandwidth = ieee80211_sta_cap_rx_bw(link_sta);
78 link_sta->pub->bandwidth = ieee80211_sta_cur_vht_bw(link_sta);
79
80 /*
81 * The MPDU length bits are reserved on all but 2.4 GHz and get set via
82 * VHT (5 GHz) or HE (6 GHz) capabilities.
83 */
84 if (sband->band != NL80211_BAND_2GHZ)
85 return;
86
87 switch (u8_get_bits(eht_cap->eht_cap_elem.mac_cap_info[0],
88 IEEE80211_EHT_MAC_CAP0_MAX_MPDU_LEN_MASK)) {
89 case IEEE80211_EHT_MAC_CAP0_MAX_MPDU_LEN_11454:
90 link_sta->pub->agg.max_amsdu_len =
91 IEEE80211_MAX_MPDU_LEN_VHT_11454;
92 break;
93 case IEEE80211_EHT_MAC_CAP0_MAX_MPDU_LEN_7991:
94 link_sta->pub->agg.max_amsdu_len =
95 IEEE80211_MAX_MPDU_LEN_VHT_7991;
96 break;
97 case IEEE80211_EHT_MAC_CAP0_MAX_MPDU_LEN_3895:
98 default:
99 link_sta->pub->agg.max_amsdu_len =
100 IEEE80211_MAX_MPDU_LEN_VHT_3895;
101 break;
102 }
103
104 ieee80211_sta_recalc_aggregates(&link_sta->sta->sta);
105 }
106
107 static void
ieee80211_send_eml_op_mode_notif(struct ieee80211_sub_if_data * sdata,struct ieee80211_mgmt * req,int opt_len)108 ieee80211_send_eml_op_mode_notif(struct ieee80211_sub_if_data *sdata,
109 struct ieee80211_mgmt *req, int opt_len)
110 {
111 int len = offsetofend(struct ieee80211_mgmt, u.action.u.eml_omn);
112 struct ieee80211_local *local = sdata->local;
113 struct ieee80211_mgmt *mgmt;
114 struct sk_buff *skb;
115
116 len += opt_len; /* optional len */
117 skb = dev_alloc_skb(local->tx_headroom + len);
118 if (!skb)
119 return;
120
121 skb_reserve(skb, local->tx_headroom);
122 mgmt = skb_put_zero(skb, len);
123 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
124 IEEE80211_STYPE_ACTION);
125 memcpy(mgmt->da, req->sa, ETH_ALEN);
126 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
127 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
128
129 mgmt->u.action.category = WLAN_CATEGORY_PROTECTED_EHT;
130 mgmt->u.action.u.eml_omn.action_code =
131 WLAN_PROTECTED_EHT_ACTION_EML_OP_MODE_NOTIF;
132 mgmt->u.action.u.eml_omn.dialog_token =
133 req->u.action.u.eml_omn.dialog_token;
134 mgmt->u.action.u.eml_omn.control = req->u.action.u.eml_omn.control &
135 ~(IEEE80211_EML_CTRL_EMLSR_PARAM_UPDATE |
136 IEEE80211_EML_CTRL_INDEV_COEX_ACT);
137 /* Copy optional fields from the received notification frame */
138 memcpy(mgmt->u.action.u.eml_omn.variable,
139 req->u.action.u.eml_omn.variable, opt_len);
140
141 ieee80211_tx_skb(sdata, skb);
142 }
143
ieee80211_rx_eml_op_mode_notif(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)144 void ieee80211_rx_eml_op_mode_notif(struct ieee80211_sub_if_data *sdata,
145 struct sk_buff *skb)
146 {
147 int len = offsetofend(struct ieee80211_mgmt, u.action.u.eml_omn);
148 enum nl80211_iftype type = ieee80211_vif_type_p2p(&sdata->vif);
149 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
150 const struct wiphy_iftype_ext_capab *ift_ext_capa;
151 struct ieee80211_mgmt *mgmt = (void *)skb->data;
152 struct ieee80211_local *local = sdata->local;
153 u8 control = mgmt->u.action.u.eml_omn.control;
154 u8 *ptr = mgmt->u.action.u.eml_omn.variable;
155 struct ieee80211_eml_params eml_params = {
156 .link_id = status->link_id,
157 .control = control,
158 };
159 struct sta_info *sta;
160 int opt_len = 0;
161
162 if (!ieee80211_vif_is_mld(&sdata->vif))
163 return;
164
165 /* eMLSR and eMLMR can't be enabled at the same time */
166 if ((control & IEEE80211_EML_CTRL_EMLSR_MODE) &&
167 (control & IEEE80211_EML_CTRL_EMLMR_MODE))
168 return;
169
170 if ((control & IEEE80211_EML_CTRL_EMLMR_MODE) &&
171 (control & IEEE80211_EML_CTRL_EMLSR_PARAM_UPDATE))
172 return;
173
174 ift_ext_capa = cfg80211_get_iftype_ext_capa(local->hw.wiphy, type);
175 if (!ift_ext_capa)
176 return;
177
178 if (!status->link_valid)
179 return;
180
181 sta = sta_info_get_bss(sdata, mgmt->sa);
182 if (!sta)
183 return;
184
185 if (control & IEEE80211_EML_CTRL_EMLSR_MODE) {
186 u8 emlsr_param_update_len;
187
188 if (!(ift_ext_capa->eml_capabilities &
189 IEEE80211_EML_CAP_EMLSR_SUPP))
190 return;
191
192 opt_len += sizeof(__le16); /* eMLSR link_bitmap */
193 /* eMLSR param update field is not part of Notfication frame
194 * sent by the AP to client so account it separately.
195 */
196 emlsr_param_update_len =
197 !!(control & IEEE80211_EML_CTRL_EMLSR_PARAM_UPDATE);
198
199 if (skb->len < len + opt_len + emlsr_param_update_len)
200 return;
201
202 if (control & IEEE80211_EML_CTRL_EMLSR_PARAM_UPDATE) {
203 u8 pad_delay, trans_delay;
204
205 pad_delay = u8_get_bits(ptr[2],
206 IEEE80211_EML_EMLSR_PAD_DELAY);
207 if (pad_delay >
208 IEEE80211_EML_CAP_EMLSR_PADDING_DELAY_256US)
209 return;
210
211 trans_delay = u8_get_bits(ptr[2],
212 IEEE80211_EML_EMLSR_TRANS_DELAY);
213 if (trans_delay >
214 IEEE80211_EML_CAP_EMLSR_TRANSITION_DELAY_256US)
215 return;
216
217 /* Update sta padding and transition delay */
218 sta->sta.eml_cap =
219 u8_replace_bits(sta->sta.eml_cap,
220 pad_delay,
221 IEEE80211_EML_CAP_EMLSR_PADDING_DELAY);
222 sta->sta.eml_cap =
223 u8_replace_bits(sta->sta.eml_cap,
224 trans_delay,
225 IEEE80211_EML_CAP_EMLSR_TRANSITION_DELAY);
226 }
227 }
228
229 if (control & IEEE80211_EML_CTRL_EMLMR_MODE) {
230 u8 mcs_map_size;
231 int i;
232
233 if (!(ift_ext_capa->eml_capabilities &
234 IEEE80211_EML_CAP_EMLMR_SUPPORT))
235 return;
236
237 opt_len += sizeof(__le16); /* eMLMR link_bitmap */
238 opt_len++; /* eMLMR mcs_map_count */
239 if (skb->len < len + opt_len)
240 return;
241
242 eml_params.emlmr_mcs_map_count = ptr[2];
243 if (eml_params.emlmr_mcs_map_count > 2)
244 return;
245
246 mcs_map_size = 3 * (1 + eml_params.emlmr_mcs_map_count);
247 opt_len += mcs_map_size;
248 if (skb->len < len + opt_len)
249 return;
250
251 for (i = 0; i < mcs_map_size; i++) {
252 u8 rx_mcs, tx_mcs;
253
254 rx_mcs = u8_get_bits(ptr[3 + i],
255 IEEE80211_EML_EMLMR_RX_MCS_MAP);
256 if (rx_mcs > 8)
257 return;
258
259 tx_mcs = u8_get_bits(ptr[3 + i],
260 IEEE80211_EML_EMLMR_TX_MCS_MAP);
261 if (tx_mcs > 8)
262 return;
263 }
264
265 memcpy(eml_params.emlmr_mcs_map_bw, &ptr[3], mcs_map_size);
266 }
267
268 if ((control & IEEE80211_EML_CTRL_EMLSR_MODE) ||
269 (control & IEEE80211_EML_CTRL_EMLMR_MODE)) {
270 eml_params.link_bitmap = get_unaligned_le16(ptr);
271 if ((eml_params.link_bitmap & sdata->vif.active_links) !=
272 eml_params.link_bitmap)
273 return;
274 }
275
276 if (drv_set_eml_op_mode(sdata, &sta->sta, &eml_params))
277 return;
278
279 ieee80211_send_eml_op_mode_notif(sdata, mgmt, opt_len);
280 }
281