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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> | |
44d414db JB |
17 | #include <net/mac80211.h> |
18 | #include "ieee80211_i.h" | |
81cb7623 | 19 | #include "rate.h" |
44d414db | 20 | |
ae5eb026 JB |
21 | void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_supported_band *sband, |
22 | struct ieee80211_ht_cap *ht_cap_ie, | |
d9fe60de | 23 | struct ieee80211_sta_ht_cap *ht_cap) |
44d414db | 24 | { |
ae5eb026 JB |
25 | u8 ampdu_info, tx_mcs_set_cap; |
26 | int i, max_tx_streams; | |
44d414db | 27 | |
d9fe60de | 28 | BUG_ON(!ht_cap); |
44d414db | 29 | |
d9fe60de | 30 | memset(ht_cap, 0, sizeof(*ht_cap)); |
44d414db | 31 | |
ae5eb026 JB |
32 | if (!ht_cap_ie) |
33 | return; | |
d9fe60de | 34 | |
ae5eb026 | 35 | ht_cap->ht_supported = true; |
d9fe60de | 36 | |
9a418af5 JB |
37 | /* |
38 | * The bits listed in this expression should be | |
39 | * the same for the peer and us, if the station | |
40 | * advertises more then we can't use those thus | |
41 | * we mask them out. | |
42 | */ | |
43 | ht_cap->cap = le16_to_cpu(ht_cap_ie->cap_info) & | |
44 | (sband->ht_cap.cap | | |
45 | ~(IEEE80211_HT_CAP_LDPC_CODING | | |
46 | IEEE80211_HT_CAP_SUP_WIDTH_20_40 | | |
47 | IEEE80211_HT_CAP_GRN_FLD | | |
48 | IEEE80211_HT_CAP_SGI_20 | | |
49 | IEEE80211_HT_CAP_SGI_40 | | |
50 | IEEE80211_HT_CAP_DSSSCCK40)); | |
51 | /* | |
52 | * The STBC bits are asymmetric -- if we don't have | |
53 | * TX then mask out the peer's RX and vice versa. | |
54 | */ | |
55 | if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_TX_STBC)) | |
56 | ht_cap->cap &= ~IEEE80211_HT_CAP_RX_STBC; | |
57 | if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_RX_STBC)) | |
58 | ht_cap->cap &= ~IEEE80211_HT_CAP_TX_STBC; | |
d9fe60de | 59 | |
ae5eb026 JB |
60 | ampdu_info = ht_cap_ie->ampdu_params_info; |
61 | ht_cap->ampdu_factor = | |
62 | ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR; | |
63 | ht_cap->ampdu_density = | |
64 | (ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2; | |
44d414db | 65 | |
d9fe60de JB |
66 | /* own MCS TX capabilities */ |
67 | tx_mcs_set_cap = sband->ht_cap.mcs.tx_params; | |
68 | ||
d9fe60de JB |
69 | /* can we TX with MCS rates? */ |
70 | if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED)) | |
ae5eb026 | 71 | return; |
d9fe60de JB |
72 | |
73 | /* Counting from 0, therefore +1 */ | |
74 | if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF) | |
75 | max_tx_streams = | |
76 | ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK) | |
77 | >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1; | |
78 | else | |
79 | max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS; | |
80 | ||
81 | /* | |
82 | * 802.11n D5.0 20.3.5 / 20.6 says: | |
83 | * - indices 0 to 7 and 32 are single spatial stream | |
84 | * - 8 to 31 are multiple spatial streams using equal modulation | |
85 | * [8..15 for two streams, 16..23 for three and 24..31 for four] | |
86 | * - remainder are multiple spatial streams using unequal modulation | |
87 | */ | |
88 | for (i = 0; i < max_tx_streams; i++) | |
ae5eb026 JB |
89 | ht_cap->mcs.rx_mask[i] = |
90 | sband->ht_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i]; | |
d9fe60de JB |
91 | |
92 | if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION) | |
93 | for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE; | |
94 | i < IEEE80211_HT_MCS_MASK_LEN; i++) | |
ae5eb026 | 95 | ht_cap->mcs.rx_mask[i] = |
d9fe60de | 96 | sband->ht_cap.mcs.rx_mask[i] & |
ae5eb026 | 97 | ht_cap_ie->mcs.rx_mask[i]; |
d9fe60de JB |
98 | |
99 | /* handle MCS rate 32 too */ | |
ae5eb026 JB |
100 | if (sband->ht_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1) |
101 | ht_cap->mcs.rx_mask[32/8] |= 1; | |
102 | } | |
103 | ||
2dace10e | 104 | void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta) |
de1ede7a | 105 | { |
b8695a8f | 106 | int i; |
de1ede7a | 107 | |
b8695a8f | 108 | for (i = 0; i < STA_TID_NUM; i++) { |
849b7967 JB |
109 | __ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR); |
110 | __ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT, | |
111 | WLAN_REASON_QSTA_LEAVE_QBSS); | |
de1ede7a | 112 | } |
de1ede7a JB |
113 | } |
114 | ||
b8695a8f JB |
115 | void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata, |
116 | const u8 *da, u16 tid, | |
117 | u16 initiator, u16 reason_code) | |
44d414db JB |
118 | { |
119 | struct ieee80211_local *local = sdata->local; | |
44d414db JB |
120 | struct sk_buff *skb; |
121 | struct ieee80211_mgmt *mgmt; | |
122 | u16 params; | |
123 | ||
124 | skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); | |
125 | ||
126 | if (!skb) { | |
127 | printk(KERN_ERR "%s: failed to allocate buffer " | |
128 | "for delba frame\n", sdata->dev->name); | |
129 | return; | |
130 | } | |
131 | ||
132 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
133 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
134 | memset(mgmt, 0, 24); | |
135 | memcpy(mgmt->da, da, ETH_ALEN); | |
136 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); | |
8abd3f9b JB |
137 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
138 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
44d414db | 139 | memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN); |
46900298 JB |
140 | else if (sdata->vif.type == NL80211_IFTYPE_STATION) |
141 | memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); | |
142 | ||
44d414db JB |
143 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
144 | IEEE80211_STYPE_ACTION); | |
145 | ||
146 | skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba)); | |
147 | ||
148 | mgmt->u.action.category = WLAN_CATEGORY_BACK; | |
149 | mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA; | |
150 | params = (u16)(initiator << 11); /* bit 11 initiator */ | |
151 | params |= (u16)(tid << 12); /* bit 15:12 TID number */ | |
152 | ||
153 | mgmt->u.action.u.delba.params = cpu_to_le16(params); | |
154 | mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code); | |
155 | ||
62ae67be | 156 | ieee80211_tx_skb(sdata, skb); |
44d414db JB |
157 | } |
158 | ||
de1ede7a JB |
159 | void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata, |
160 | struct sta_info *sta, | |
161 | struct ieee80211_mgmt *mgmt, size_t len) | |
162 | { | |
de1ede7a JB |
163 | u16 tid, params; |
164 | u16 initiator; | |
de1ede7a JB |
165 | |
166 | params = le16_to_cpu(mgmt->u.action.u.delba.params); | |
167 | tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12; | |
168 | initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11; | |
169 | ||
170 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
171 | if (net_ratelimit()) | |
0c68ae26 JB |
172 | printk(KERN_DEBUG "delba from %pM (%s) tid %d reason code %d\n", |
173 | mgmt->sa, initiator ? "initiator" : "recipient", tid, | |
372362ad | 174 | le16_to_cpu(mgmt->u.action.u.delba.reason_code)); |
de1ede7a JB |
175 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
176 | ||
177 | if (initiator == WLAN_BACK_INITIATOR) | |
17741cdc | 178 | ieee80211_sta_stop_rx_ba_session(sdata, sta->sta.addr, tid, |
de1ede7a JB |
179 | WLAN_BACK_INITIATOR, 0); |
180 | else { /* WLAN_BACK_RECIPIENT */ | |
181 | spin_lock_bh(&sta->lock); | |
827d42c9 JB |
182 | if (sta->ampdu_mlme.tid_state_tx[tid] & HT_ADDBA_REQUESTED_MSK) |
183 | ___ieee80211_stop_tx_ba_session(sta, tid, | |
184 | WLAN_BACK_RECIPIENT); | |
de1ede7a | 185 | spin_unlock_bh(&sta->lock); |
de1ede7a JB |
186 | } |
187 | } |