2 Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
3 <http://rt2x00.serialmonkey.com>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the
17 Free Software Foundation, Inc.,
18 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 Abstract: rt2x00 HT specific routines.
26 #include <linux/kernel.h>
27 #include <linux/module.h>
30 #include "rt2x00lib.h"
32 void rt2x00ht_create_tx_descriptor(struct queue_entry
*entry
,
33 struct txentry_desc
*txdesc
,
34 const struct rt2x00_rate
*hwrate
)
36 struct ieee80211_tx_info
*tx_info
= IEEE80211_SKB_CB(entry
->skb
);
37 struct ieee80211_tx_rate
*txrate
= &tx_info
->control
.rates
[0];
38 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)entry
->skb
->data
;
40 if (tx_info
->control
.sta
)
41 txdesc
->mpdu_density
=
42 tx_info
->control
.sta
->ht_cap
.ampdu_density
;
44 txdesc
->mpdu_density
= 0;
46 txdesc
->ba_size
= 7; /* FIXME: What value is needed? */
49 (tx_info
->flags
& IEEE80211_TX_CTL_STBC
) >> IEEE80211_TX_CTL_STBC_SHIFT
;
52 * If IEEE80211_TX_RC_MCS is set txrate->idx just contains the
55 if (txrate
->flags
& IEEE80211_TX_RC_MCS
) {
56 txdesc
->mcs
= txrate
->idx
;
59 * MIMO PS should be set to 1 for STA's using dynamic SM PS
60 * when using more then one tx stream (>MCS7).
62 if (tx_info
->control
.sta
&& txdesc
->mcs
> 7 &&
63 ((tx_info
->control
.sta
->ht_cap
.cap
&
64 IEEE80211_HT_CAP_SM_PS
) >>
65 IEEE80211_HT_CAP_SM_PS_SHIFT
) ==
66 WLAN_HT_CAP_SM_PS_DYNAMIC
)
67 __set_bit(ENTRY_TXD_HT_MIMO_PS
, &txdesc
->flags
);
69 txdesc
->mcs
= rt2x00_get_rate_mcs(hwrate
->mcs
);
70 if (txrate
->flags
& IEEE80211_TX_RC_USE_SHORT_PREAMBLE
)
76 * This frame is eligible for an AMPDU, however, don't aggregate
77 * frames that are intended to probe a specific tx rate.
79 if (tx_info
->flags
& IEEE80211_TX_CTL_AMPDU
&&
80 !(tx_info
->flags
& IEEE80211_TX_CTL_RATE_CTRL_PROBE
))
81 __set_bit(ENTRY_TXD_HT_AMPDU
, &txdesc
->flags
);
84 * Determine HT Mix/Greenfield rate mode
86 if (txrate
->flags
& IEEE80211_TX_RC_MCS
)
87 txdesc
->rate_mode
= RATE_MODE_HT_MIX
;
88 if (txrate
->flags
& IEEE80211_TX_RC_GREEN_FIELD
)
89 txdesc
->rate_mode
= RATE_MODE_HT_GREENFIELD
;
92 * Set 40Mhz mode if necessary (for legacy rates this will
93 * duplicate the frame to both channels).
95 if (txrate
->flags
& IEEE80211_TX_RC_40_MHZ_WIDTH
||
96 txrate
->flags
& IEEE80211_TX_RC_DUP_DATA
)
97 __set_bit(ENTRY_TXD_HT_BW_40
, &txdesc
->flags
);
98 if (txrate
->flags
& IEEE80211_TX_RC_SHORT_GI
)
99 __set_bit(ENTRY_TXD_HT_SHORT_GI
, &txdesc
->flags
);
102 * Determine IFS values
103 * - Use TXOP_BACKOFF for management frames
104 * - Use TXOP_SIFS for fragment bursts
105 * - Use TXOP_HTTXOP for everything else
107 * Note: rt2800 devices won't use CTS protection (if used)
108 * for frames not transmitted with TXOP_HTTXOP
110 if (ieee80211_is_mgmt(hdr
->frame_control
))
111 txdesc
->txop
= TXOP_BACKOFF
;
112 else if (!(tx_info
->flags
& IEEE80211_TX_CTL_FIRST_FRAGMENT
))
113 txdesc
->txop
= TXOP_SIFS
;
115 txdesc
->txop
= TXOP_HTTXOP
;
118 u16
rt2x00ht_center_channel(struct rt2x00_dev
*rt2x00dev
,
119 struct ieee80211_conf
*conf
)
121 struct hw_mode_spec
*spec
= &rt2x00dev
->spec
;
126 * Initialize center channel to current channel.
128 center_channel
= spec
->channels
[conf
->channel
->hw_value
].channel
;
131 * Adjust center channel to HT40+ and HT40- operation.
133 if (conf_is_ht40_plus(conf
))
135 else if (conf_is_ht40_minus(conf
))
136 center_channel
-= (center_channel
== 14) ? 1 : 2;
138 for (i
= 0; i
< spec
->num_channels
; i
++)
139 if (spec
->channels
[i
].channel
== center_channel
)
143 return conf
->channel
->hw_value
;