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44d414db JB |
1 | /* |
2 | * HT handling | |
3 | * | |
4 | * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> | |
bacac545 JB |
5 | * Copyright 2002-2005, Instant802 Networks, Inc. |
6 | * Copyright 2005-2006, Devicescape Software, Inc. | |
44d414db JB |
7 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> |
8 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> | |
9 | * Copyright 2007-2008, Intel Corporation | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 as | |
13 | * published by the Free Software Foundation. | |
14 | */ | |
15 | ||
16 | #include <linux/ieee80211.h> | |
17 | #include <net/wireless.h> | |
18 | #include <net/mac80211.h> | |
19 | #include "ieee80211_i.h" | |
81cb7623 | 20 | #include "rate.h" |
44d414db | 21 | |
ae5eb026 JB |
22 | void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_supported_band *sband, |
23 | struct ieee80211_ht_cap *ht_cap_ie, | |
d9fe60de | 24 | struct ieee80211_sta_ht_cap *ht_cap) |
44d414db | 25 | { |
ae5eb026 JB |
26 | u8 ampdu_info, tx_mcs_set_cap; |
27 | int i, max_tx_streams; | |
44d414db | 28 | |
d9fe60de | 29 | BUG_ON(!ht_cap); |
44d414db | 30 | |
d9fe60de | 31 | memset(ht_cap, 0, sizeof(*ht_cap)); |
44d414db | 32 | |
ae5eb026 JB |
33 | if (!ht_cap_ie) |
34 | return; | |
d9fe60de | 35 | |
ae5eb026 | 36 | ht_cap->ht_supported = true; |
d9fe60de | 37 | |
f16f33df | 38 | ht_cap->cap = le16_to_cpu(ht_cap_ie->cap_info) & sband->ht_cap.cap; |
ae5eb026 JB |
39 | ht_cap->cap &= ~IEEE80211_HT_CAP_SM_PS; |
40 | ht_cap->cap |= sband->ht_cap.cap & IEEE80211_HT_CAP_SM_PS; | |
d9fe60de | 41 | |
ae5eb026 JB |
42 | ampdu_info = ht_cap_ie->ampdu_params_info; |
43 | ht_cap->ampdu_factor = | |
44 | ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR; | |
45 | ht_cap->ampdu_density = | |
46 | (ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2; | |
44d414db | 47 | |
d9fe60de JB |
48 | /* own MCS TX capabilities */ |
49 | tx_mcs_set_cap = sband->ht_cap.mcs.tx_params; | |
50 | ||
d9fe60de JB |
51 | /* can we TX with MCS rates? */ |
52 | if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED)) | |
ae5eb026 | 53 | return; |
d9fe60de JB |
54 | |
55 | /* Counting from 0, therefore +1 */ | |
56 | if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF) | |
57 | max_tx_streams = | |
58 | ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK) | |
59 | >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1; | |
60 | else | |
61 | max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS; | |
62 | ||
63 | /* | |
64 | * 802.11n D5.0 20.3.5 / 20.6 says: | |
65 | * - indices 0 to 7 and 32 are single spatial stream | |
66 | * - 8 to 31 are multiple spatial streams using equal modulation | |
67 | * [8..15 for two streams, 16..23 for three and 24..31 for four] | |
68 | * - remainder are multiple spatial streams using unequal modulation | |
69 | */ | |
70 | for (i = 0; i < max_tx_streams; i++) | |
ae5eb026 JB |
71 | ht_cap->mcs.rx_mask[i] = |
72 | sband->ht_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i]; | |
d9fe60de JB |
73 | |
74 | if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION) | |
75 | for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE; | |
76 | i < IEEE80211_HT_MCS_MASK_LEN; i++) | |
ae5eb026 | 77 | ht_cap->mcs.rx_mask[i] = |
d9fe60de | 78 | sband->ht_cap.mcs.rx_mask[i] & |
ae5eb026 | 79 | ht_cap_ie->mcs.rx_mask[i]; |
d9fe60de JB |
80 | |
81 | /* handle MCS rate 32 too */ | |
ae5eb026 JB |
82 | if (sband->ht_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1) |
83 | ht_cap->mcs.rx_mask[32/8] |= 1; | |
84 | } | |
85 | ||
86 | /* | |
87 | * ieee80211_enable_ht should be called only after the operating band | |
88 | * has been determined as ht configuration depends on the hw's | |
89 | * HT abilities for a specific band. | |
90 | */ | |
91 | u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata, | |
92 | struct ieee80211_ht_info *hti, | |
93 | u16 ap_ht_cap_flags) | |
94 | { | |
95 | struct ieee80211_local *local = sdata->local; | |
96 | struct ieee80211_supported_band *sband; | |
81cb7623 | 97 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
ae5eb026 | 98 | struct ieee80211_bss_ht_conf ht; |
81cb7623 | 99 | struct sta_info *sta; |
ae5eb026 JB |
100 | u32 changed = 0; |
101 | bool enable_ht = true, ht_changed; | |
094d05dc | 102 | enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT; |
ae5eb026 JB |
103 | |
104 | sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; | |
105 | ||
106 | memset(&ht, 0, sizeof(ht)); | |
107 | ||
108 | /* HT is not supported */ | |
109 | if (!sband->ht_cap.ht_supported) | |
110 | enable_ht = false; | |
111 | ||
112 | /* check that channel matches the right operating channel */ | |
113 | if (local->hw.conf.channel->center_freq != | |
114 | ieee80211_channel_to_frequency(hti->control_chan)) | |
115 | enable_ht = false; | |
116 | ||
094d05dc S |
117 | if (enable_ht) { |
118 | channel_type = NL80211_CHAN_HT20; | |
119 | ||
120 | if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) && | |
121 | (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) && | |
122 | (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) { | |
123 | switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) { | |
124 | case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: | |
125 | channel_type = NL80211_CHAN_HT40PLUS; | |
126 | break; | |
127 | case IEEE80211_HT_PARAM_CHA_SEC_BELOW: | |
128 | channel_type = NL80211_CHAN_HT40MINUS; | |
129 | break; | |
130 | } | |
131 | } | |
132 | } | |
133 | ||
285256a5 | 134 | ht_changed = conf_is_ht(&local->hw.conf) != enable_ht || |
4797938c | 135 | channel_type != local->hw.conf.channel_type; |
094d05dc S |
136 | |
137 | local->oper_channel_type = channel_type; | |
094d05dc | 138 | |
4797938c JB |
139 | if (ht_changed) { |
140 | /* channel_type change automatically detected */ | |
141 | ieee80211_hw_config(local, 0); | |
81cb7623 S |
142 | |
143 | rcu_read_lock(); | |
144 | ||
145 | sta = sta_info_get(local, ifmgd->bssid); | |
146 | if (sta) | |
147 | rate_control_rate_update(local, sband, sta, | |
148 | IEEE80211_RC_HT_CHANGED); | |
149 | ||
150 | rcu_read_unlock(); | |
151 | ||
4797938c | 152 | } |
ae5eb026 JB |
153 | |
154 | /* disable HT */ | |
155 | if (!enable_ht) | |
156 | return 0; | |
094d05dc | 157 | |
ae5eb026 | 158 | ht.operation_mode = le16_to_cpu(hti->operation_mode); |
d9fe60de | 159 | |
d9fe60de | 160 | /* if bss configuration changed store the new one */ |
ae5eb026 | 161 | if (memcmp(&sdata->vif.bss_conf.ht, &ht, sizeof(ht))) { |
d9fe60de | 162 | changed |= BSS_CHANGED_HT; |
ae5eb026 | 163 | sdata->vif.bss_conf.ht = ht; |
d9fe60de JB |
164 | } |
165 | ||
166 | return changed; | |
44d414db JB |
167 | } |
168 | ||
2dace10e | 169 | void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta) |
de1ede7a | 170 | { |
b8695a8f | 171 | int i; |
de1ede7a | 172 | |
b8695a8f | 173 | for (i = 0; i < STA_TID_NUM; i++) { |
849b7967 JB |
174 | __ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR); |
175 | __ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT, | |
176 | WLAN_REASON_QSTA_LEAVE_QBSS); | |
de1ede7a | 177 | } |
de1ede7a JB |
178 | } |
179 | ||
b8695a8f JB |
180 | void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata, |
181 | const u8 *da, u16 tid, | |
182 | u16 initiator, u16 reason_code) | |
44d414db JB |
183 | { |
184 | struct ieee80211_local *local = sdata->local; | |
44d414db JB |
185 | struct sk_buff *skb; |
186 | struct ieee80211_mgmt *mgmt; | |
187 | u16 params; | |
188 | ||
189 | skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); | |
190 | ||
191 | if (!skb) { | |
192 | printk(KERN_ERR "%s: failed to allocate buffer " | |
193 | "for delba frame\n", sdata->dev->name); | |
194 | return; | |
195 | } | |
196 | ||
197 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
198 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
199 | memset(mgmt, 0, 24); | |
200 | memcpy(mgmt->da, da, ETH_ALEN); | |
201 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); | |
8abd3f9b JB |
202 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
203 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
44d414db | 204 | memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN); |
46900298 JB |
205 | else if (sdata->vif.type == NL80211_IFTYPE_STATION) |
206 | memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); | |
207 | ||
44d414db JB |
208 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
209 | IEEE80211_STYPE_ACTION); | |
210 | ||
211 | skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba)); | |
212 | ||
213 | mgmt->u.action.category = WLAN_CATEGORY_BACK; | |
214 | mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA; | |
215 | params = (u16)(initiator << 11); /* bit 11 initiator */ | |
216 | params |= (u16)(tid << 12); /* bit 15:12 TID number */ | |
217 | ||
218 | mgmt->u.action.u.delba.params = cpu_to_le16(params); | |
219 | mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code); | |
220 | ||
1acc97b6 | 221 | ieee80211_tx_skb(sdata, skb, 1); |
44d414db JB |
222 | } |
223 | ||
de1ede7a JB |
224 | void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata, |
225 | struct sta_info *sta, | |
226 | struct ieee80211_mgmt *mgmt, size_t len) | |
227 | { | |
228 | struct ieee80211_local *local = sdata->local; | |
229 | u16 tid, params; | |
230 | u16 initiator; | |
de1ede7a JB |
231 | |
232 | params = le16_to_cpu(mgmt->u.action.u.delba.params); | |
233 | tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12; | |
234 | initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11; | |
235 | ||
236 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
237 | if (net_ratelimit()) | |
0c68ae26 JB |
238 | printk(KERN_DEBUG "delba from %pM (%s) tid %d reason code %d\n", |
239 | mgmt->sa, initiator ? "initiator" : "recipient", tid, | |
de1ede7a JB |
240 | mgmt->u.action.u.delba.reason_code); |
241 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
242 | ||
243 | if (initiator == WLAN_BACK_INITIATOR) | |
17741cdc | 244 | ieee80211_sta_stop_rx_ba_session(sdata, sta->sta.addr, tid, |
de1ede7a JB |
245 | WLAN_BACK_INITIATOR, 0); |
246 | else { /* WLAN_BACK_RECIPIENT */ | |
247 | spin_lock_bh(&sta->lock); | |
248 | sta->ampdu_mlme.tid_state_tx[tid] = | |
249 | HT_AGG_STATE_OPERATIONAL; | |
250 | spin_unlock_bh(&sta->lock); | |
17741cdc | 251 | ieee80211_stop_tx_ba_session(&local->hw, sta->sta.addr, tid, |
de1ede7a JB |
252 | WLAN_BACK_RECIPIENT); |
253 | } | |
254 | } |