4 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
5 * Copyright 2002-2005, Instant802 Networks, Inc.
6 * Copyright 2005-2006, Devicescape Software, Inc.
7 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
8 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
9 * Copyright 2007-2008, Intel Corporation
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.
16 #include <linux/ieee80211.h>
17 #include <net/mac80211.h>
18 #include "ieee80211_i.h"
21 void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_supported_band
*sband
,
22 struct ieee80211_ht_cap
*ht_cap_ie
,
23 struct ieee80211_sta_ht_cap
*ht_cap
)
25 u8 ampdu_info
, tx_mcs_set_cap
;
26 int i
, max_tx_streams
;
30 memset(ht_cap
, 0, sizeof(*ht_cap
));
35 ht_cap
->ht_supported
= true;
37 ht_cap
->cap
= le16_to_cpu(ht_cap_ie
->cap_info
) & sband
->ht_cap
.cap
;
38 ht_cap
->cap
&= ~IEEE80211_HT_CAP_SM_PS
;
39 ht_cap
->cap
|= sband
->ht_cap
.cap
& IEEE80211_HT_CAP_SM_PS
;
41 ampdu_info
= ht_cap_ie
->ampdu_params_info
;
42 ht_cap
->ampdu_factor
=
43 ampdu_info
& IEEE80211_HT_AMPDU_PARM_FACTOR
;
44 ht_cap
->ampdu_density
=
45 (ampdu_info
& IEEE80211_HT_AMPDU_PARM_DENSITY
) >> 2;
47 /* own MCS TX capabilities */
48 tx_mcs_set_cap
= sband
->ht_cap
.mcs
.tx_params
;
50 /* can we TX with MCS rates? */
51 if (!(tx_mcs_set_cap
& IEEE80211_HT_MCS_TX_DEFINED
))
54 /* Counting from 0, therefore +1 */
55 if (tx_mcs_set_cap
& IEEE80211_HT_MCS_TX_RX_DIFF
)
57 ((tx_mcs_set_cap
& IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK
)
58 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT
) + 1;
60 max_tx_streams
= IEEE80211_HT_MCS_TX_MAX_STREAMS
;
63 * 802.11n D5.0 20.3.5 / 20.6 says:
64 * - indices 0 to 7 and 32 are single spatial stream
65 * - 8 to 31 are multiple spatial streams using equal modulation
66 * [8..15 for two streams, 16..23 for three and 24..31 for four]
67 * - remainder are multiple spatial streams using unequal modulation
69 for (i
= 0; i
< max_tx_streams
; i
++)
70 ht_cap
->mcs
.rx_mask
[i
] =
71 sband
->ht_cap
.mcs
.rx_mask
[i
] & ht_cap_ie
->mcs
.rx_mask
[i
];
73 if (tx_mcs_set_cap
& IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION
)
74 for (i
= IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE
;
75 i
< IEEE80211_HT_MCS_MASK_LEN
; i
++)
76 ht_cap
->mcs
.rx_mask
[i
] =
77 sband
->ht_cap
.mcs
.rx_mask
[i
] &
78 ht_cap_ie
->mcs
.rx_mask
[i
];
80 /* handle MCS rate 32 too */
81 if (sband
->ht_cap
.mcs
.rx_mask
[32/8] & ht_cap_ie
->mcs
.rx_mask
[32/8] & 1)
82 ht_cap
->mcs
.rx_mask
[32/8] |= 1;
85 void ieee80211_sta_tear_down_BA_sessions(struct sta_info
*sta
)
89 for (i
= 0; i
< STA_TID_NUM
; i
++) {
90 __ieee80211_stop_tx_ba_session(sta
, i
, WLAN_BACK_INITIATOR
);
91 __ieee80211_stop_rx_ba_session(sta
, i
, WLAN_BACK_RECIPIENT
,
92 WLAN_REASON_QSTA_LEAVE_QBSS
);
96 void ieee80211_send_delba(struct ieee80211_sub_if_data
*sdata
,
97 const u8
*da
, u16 tid
,
98 u16 initiator
, u16 reason_code
)
100 struct ieee80211_local
*local
= sdata
->local
;
102 struct ieee80211_mgmt
*mgmt
;
105 skb
= dev_alloc_skb(sizeof(*mgmt
) + local
->hw
.extra_tx_headroom
);
108 printk(KERN_ERR
"%s: failed to allocate buffer "
109 "for delba frame\n", sdata
->dev
->name
);
113 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
114 mgmt
= (struct ieee80211_mgmt
*) skb_put(skb
, 24);
116 memcpy(mgmt
->da
, da
, ETH_ALEN
);
117 memcpy(mgmt
->sa
, sdata
->dev
->dev_addr
, ETH_ALEN
);
118 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
119 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
120 memcpy(mgmt
->bssid
, sdata
->dev
->dev_addr
, ETH_ALEN
);
121 else if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
)
122 memcpy(mgmt
->bssid
, sdata
->u
.mgd
.bssid
, ETH_ALEN
);
124 mgmt
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
125 IEEE80211_STYPE_ACTION
);
127 skb_put(skb
, 1 + sizeof(mgmt
->u
.action
.u
.delba
));
129 mgmt
->u
.action
.category
= WLAN_CATEGORY_BACK
;
130 mgmt
->u
.action
.u
.delba
.action_code
= WLAN_ACTION_DELBA
;
131 params
= (u16
)(initiator
<< 11); /* bit 11 initiator */
132 params
|= (u16
)(tid
<< 12); /* bit 15:12 TID number */
134 mgmt
->u
.action
.u
.delba
.params
= cpu_to_le16(params
);
135 mgmt
->u
.action
.u
.delba
.reason_code
= cpu_to_le16(reason_code
);
137 ieee80211_tx_skb(sdata
, skb
);
140 void ieee80211_process_delba(struct ieee80211_sub_if_data
*sdata
,
141 struct sta_info
*sta
,
142 struct ieee80211_mgmt
*mgmt
, size_t len
)
147 params
= le16_to_cpu(mgmt
->u
.action
.u
.delba
.params
);
148 tid
= (params
& IEEE80211_DELBA_PARAM_TID_MASK
) >> 12;
149 initiator
= (params
& IEEE80211_DELBA_PARAM_INITIATOR_MASK
) >> 11;
151 #ifdef CONFIG_MAC80211_HT_DEBUG
153 printk(KERN_DEBUG
"delba from %pM (%s) tid %d reason code %d\n",
154 mgmt
->sa
, initiator
? "initiator" : "recipient", tid
,
155 le16_to_cpu(mgmt
->u
.action
.u
.delba
.reason_code
));
156 #endif /* CONFIG_MAC80211_HT_DEBUG */
158 if (initiator
== WLAN_BACK_INITIATOR
)
159 ieee80211_sta_stop_rx_ba_session(sdata
, sta
->sta
.addr
, tid
,
160 WLAN_BACK_INITIATOR
, 0);
161 else { /* WLAN_BACK_RECIPIENT */
162 spin_lock_bh(&sta
->lock
);
163 if (sta
->ampdu_mlme
.tid_state_tx
[tid
] & HT_ADDBA_REQUESTED_MSK
)
164 ___ieee80211_stop_tx_ba_session(sta
, tid
,
165 WLAN_BACK_RECIPIENT
);
166 spin_unlock_bh(&sta
->lock
);