Commit | Line | Data |
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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> | |
cfcdbde3 | 9 | * Copyright 2007-2010, Intel Corporation |
44d414db JB |
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 | |
15804e3e | 32 | if (!ht_cap_ie || !sband->ht_cap.ht_supported) |
ae5eb026 | 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 | |
0ab33703 JB |
108 | cancel_work_sync(&sta->ampdu_mlme.work); |
109 | ||
b8695a8f | 110 | for (i = 0; i < STA_TID_NUM; i++) { |
849b7967 JB |
111 | __ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR); |
112 | __ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT, | |
113 | WLAN_REASON_QSTA_LEAVE_QBSS); | |
de1ede7a | 114 | } |
de1ede7a JB |
115 | } |
116 | ||
67c282c0 JB |
117 | void ieee80211_ba_session_work(struct work_struct *work) |
118 | { | |
119 | struct sta_info *sta = | |
120 | container_of(work, struct sta_info, ampdu_mlme.work); | |
121 | struct tid_ampdu_tx *tid_tx; | |
122 | int tid; | |
123 | ||
124 | /* | |
125 | * When this flag is set, new sessions should be | |
126 | * blocked, and existing sessions will be torn | |
127 | * down by the code that set the flag, so this | |
128 | * need not run. | |
129 | */ | |
130 | if (test_sta_flags(sta, WLAN_STA_BLOCK_BA)) | |
131 | return; | |
132 | ||
a93e3644 | 133 | mutex_lock(&sta->ampdu_mlme.mtx); |
67c282c0 | 134 | for (tid = 0; tid < STA_TID_NUM; tid++) { |
7c3b1dd8 JB |
135 | if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired)) |
136 | ___ieee80211_stop_rx_ba_session( | |
137 | sta, tid, WLAN_BACK_RECIPIENT, | |
138 | WLAN_REASON_QSTA_TIMEOUT); | |
139 | ||
67c282c0 JB |
140 | tid_tx = sta->ampdu_mlme.tid_tx[tid]; |
141 | if (!tid_tx) | |
142 | continue; | |
143 | ||
144 | if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) | |
145 | ieee80211_tx_ba_session_handle_start(sta, tid); | |
146 | else if (test_and_clear_bit(HT_AGG_STATE_WANT_STOP, | |
147 | &tid_tx->state)) | |
148 | ___ieee80211_stop_tx_ba_session(sta, tid, | |
149 | WLAN_BACK_INITIATOR); | |
150 | } | |
cfcdbde3 | 151 | mutex_unlock(&sta->ampdu_mlme.mtx); |
67c282c0 JB |
152 | } |
153 | ||
b8695a8f JB |
154 | void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata, |
155 | const u8 *da, u16 tid, | |
156 | u16 initiator, u16 reason_code) | |
44d414db JB |
157 | { |
158 | struct ieee80211_local *local = sdata->local; | |
44d414db JB |
159 | struct sk_buff *skb; |
160 | struct ieee80211_mgmt *mgmt; | |
161 | u16 params; | |
162 | ||
163 | skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); | |
164 | ||
165 | if (!skb) { | |
166 | printk(KERN_ERR "%s: failed to allocate buffer " | |
47846c9b | 167 | "for delba frame\n", sdata->name); |
44d414db JB |
168 | return; |
169 | } | |
170 | ||
171 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
172 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
173 | memset(mgmt, 0, 24); | |
174 | memcpy(mgmt->da, da, ETH_ALEN); | |
47846c9b | 175 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
8abd3f9b JB |
176 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
177 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
47846c9b | 178 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
46900298 JB |
179 | else if (sdata->vif.type == NL80211_IFTYPE_STATION) |
180 | memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); | |
181 | ||
44d414db JB |
182 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
183 | IEEE80211_STYPE_ACTION); | |
184 | ||
185 | skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba)); | |
186 | ||
187 | mgmt->u.action.category = WLAN_CATEGORY_BACK; | |
188 | mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA; | |
189 | params = (u16)(initiator << 11); /* bit 11 initiator */ | |
190 | params |= (u16)(tid << 12); /* bit 15:12 TID number */ | |
191 | ||
192 | mgmt->u.action.u.delba.params = cpu_to_le16(params); | |
193 | mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code); | |
194 | ||
62ae67be | 195 | ieee80211_tx_skb(sdata, skb); |
44d414db JB |
196 | } |
197 | ||
de1ede7a JB |
198 | void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata, |
199 | struct sta_info *sta, | |
200 | struct ieee80211_mgmt *mgmt, size_t len) | |
201 | { | |
de1ede7a JB |
202 | u16 tid, params; |
203 | u16 initiator; | |
de1ede7a JB |
204 | |
205 | params = le16_to_cpu(mgmt->u.action.u.delba.params); | |
206 | tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12; | |
207 | initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11; | |
208 | ||
209 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
210 | if (net_ratelimit()) | |
0c68ae26 JB |
211 | printk(KERN_DEBUG "delba from %pM (%s) tid %d reason code %d\n", |
212 | mgmt->sa, initiator ? "initiator" : "recipient", tid, | |
372362ad | 213 | le16_to_cpu(mgmt->u.action.u.delba.reason_code)); |
de1ede7a JB |
214 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
215 | ||
216 | if (initiator == WLAN_BACK_INITIATOR) | |
66b0470a | 217 | __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0); |
a622ab72 JB |
218 | else |
219 | __ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_RECIPIENT); | |
de1ede7a | 220 | } |
0f78231b JB |
221 | |
222 | int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata, | |
223 | enum ieee80211_smps_mode smps, const u8 *da, | |
224 | const u8 *bssid) | |
225 | { | |
226 | struct ieee80211_local *local = sdata->local; | |
227 | struct sk_buff *skb; | |
228 | struct ieee80211_mgmt *action_frame; | |
229 | ||
230 | /* 27 = header + category + action + smps mode */ | |
231 | skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom); | |
232 | if (!skb) | |
233 | return -ENOMEM; | |
234 | ||
235 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
236 | action_frame = (void *)skb_put(skb, 27); | |
237 | memcpy(action_frame->da, da, ETH_ALEN); | |
238 | memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN); | |
239 | memcpy(action_frame->bssid, bssid, ETH_ALEN); | |
240 | action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | | |
241 | IEEE80211_STYPE_ACTION); | |
242 | action_frame->u.action.category = WLAN_CATEGORY_HT; | |
243 | action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS; | |
244 | switch (smps) { | |
245 | case IEEE80211_SMPS_AUTOMATIC: | |
246 | case IEEE80211_SMPS_NUM_MODES: | |
247 | WARN_ON(1); | |
248 | case IEEE80211_SMPS_OFF: | |
249 | action_frame->u.action.u.ht_smps.smps_control = | |
250 | WLAN_HT_SMPS_CONTROL_DISABLED; | |
251 | break; | |
252 | case IEEE80211_SMPS_STATIC: | |
253 | action_frame->u.action.u.ht_smps.smps_control = | |
254 | WLAN_HT_SMPS_CONTROL_STATIC; | |
255 | break; | |
256 | case IEEE80211_SMPS_DYNAMIC: | |
257 | action_frame->u.action.u.ht_smps.smps_control = | |
258 | WLAN_HT_SMPS_CONTROL_DYNAMIC; | |
259 | break; | |
260 | } | |
261 | ||
262 | /* we'll do more on status of this frame */ | |
263 | IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; | |
264 | ieee80211_tx_skb(sdata, skb); | |
265 | ||
266 | return 0; | |
267 | } | |
d1f5b7a3 JB |
268 | |
269 | void ieee80211_request_smps_work(struct work_struct *work) | |
270 | { | |
271 | struct ieee80211_sub_if_data *sdata = | |
272 | container_of(work, struct ieee80211_sub_if_data, | |
273 | u.mgd.request_smps_work); | |
274 | ||
275 | mutex_lock(&sdata->u.mgd.mtx); | |
276 | __ieee80211_request_smps(sdata, sdata->u.mgd.driver_smps_mode); | |
277 | mutex_unlock(&sdata->u.mgd.mtx); | |
278 | } | |
279 | ||
280 | void ieee80211_request_smps(struct ieee80211_vif *vif, | |
281 | enum ieee80211_smps_mode smps_mode) | |
282 | { | |
283 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); | |
284 | ||
285 | if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) | |
286 | return; | |
287 | ||
288 | if (WARN_ON(smps_mode == IEEE80211_SMPS_OFF)) | |
289 | smps_mode = IEEE80211_SMPS_AUTOMATIC; | |
290 | ||
291 | ieee80211_queue_work(&sdata->local->hw, | |
292 | &sdata->u.mgd.request_smps_work); | |
293 | } | |
294 | /* this might change ... don't want non-open drivers using it */ | |
295 | EXPORT_SYMBOL_GPL(ieee80211_request_smps); |