145 lines
4.2 KiB
C
145 lines
4.2 KiB
C
/*
|
|
Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
|
|
<http://rt2x00.serialmonkey.com>
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the
|
|
Free Software Foundation, Inc.,
|
|
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
/*
|
|
Module: rt2x00lib
|
|
Abstract: rt2x00 HT specific routines.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
|
|
#include "rt2x00.h"
|
|
#include "rt2x00lib.h"
|
|
|
|
void rt2x00ht_create_tx_descriptor(struct queue_entry *entry,
|
|
struct txentry_desc *txdesc,
|
|
const struct rt2x00_rate *hwrate)
|
|
{
|
|
struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
|
|
struct ieee80211_tx_rate *txrate = &tx_info->control.rates[0];
|
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data;
|
|
|
|
if (tx_info->control.sta)
|
|
txdesc->mpdu_density =
|
|
tx_info->control.sta->ht_cap.ampdu_density;
|
|
else
|
|
txdesc->mpdu_density = 0;
|
|
|
|
txdesc->ba_size = 7; /* FIXME: What value is needed? */
|
|
|
|
txdesc->stbc =
|
|
(tx_info->flags & IEEE80211_TX_CTL_STBC) >> IEEE80211_TX_CTL_STBC_SHIFT;
|
|
|
|
/*
|
|
* If IEEE80211_TX_RC_MCS is set txrate->idx just contains the
|
|
* mcs rate to be used
|
|
*/
|
|
if (txrate->flags & IEEE80211_TX_RC_MCS) {
|
|
txdesc->mcs = txrate->idx;
|
|
|
|
/*
|
|
* MIMO PS should be set to 1 for STA's using dynamic SM PS
|
|
* when using more then one tx stream (>MCS7).
|
|
*/
|
|
if (tx_info->control.sta && txdesc->mcs > 7 &&
|
|
((tx_info->control.sta->ht_cap.cap &
|
|
IEEE80211_HT_CAP_SM_PS) >>
|
|
IEEE80211_HT_CAP_SM_PS_SHIFT) ==
|
|
WLAN_HT_CAP_SM_PS_DYNAMIC)
|
|
__set_bit(ENTRY_TXD_HT_MIMO_PS, &txdesc->flags);
|
|
} else {
|
|
txdesc->mcs = rt2x00_get_rate_mcs(hwrate->mcs);
|
|
if (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
|
|
txdesc->mcs |= 0x08;
|
|
}
|
|
|
|
|
|
/*
|
|
* This frame is eligible for an AMPDU, however, don't aggregate
|
|
* frames that are intended to probe a specific tx rate.
|
|
*/
|
|
if (tx_info->flags & IEEE80211_TX_CTL_AMPDU &&
|
|
!(tx_info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE))
|
|
__set_bit(ENTRY_TXD_HT_AMPDU, &txdesc->flags);
|
|
|
|
/*
|
|
* Determine HT Mix/Greenfield rate mode
|
|
*/
|
|
if (txrate->flags & IEEE80211_TX_RC_MCS)
|
|
txdesc->rate_mode = RATE_MODE_HT_MIX;
|
|
if (txrate->flags & IEEE80211_TX_RC_GREEN_FIELD)
|
|
txdesc->rate_mode = RATE_MODE_HT_GREENFIELD;
|
|
|
|
/*
|
|
* Set 40Mhz mode if necessary (for legacy rates this will
|
|
* duplicate the frame to both channels).
|
|
*/
|
|
if (txrate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH ||
|
|
txrate->flags & IEEE80211_TX_RC_DUP_DATA)
|
|
__set_bit(ENTRY_TXD_HT_BW_40, &txdesc->flags);
|
|
if (txrate->flags & IEEE80211_TX_RC_SHORT_GI)
|
|
__set_bit(ENTRY_TXD_HT_SHORT_GI, &txdesc->flags);
|
|
|
|
/*
|
|
* Determine IFS values
|
|
* - Use TXOP_BACKOFF for management frames
|
|
* - Use TXOP_SIFS for fragment bursts
|
|
* - Use TXOP_HTTXOP for everything else
|
|
*
|
|
* Note: rt2800 devices won't use CTS protection (if used)
|
|
* for frames not transmitted with TXOP_HTTXOP
|
|
*/
|
|
if (ieee80211_is_mgmt(hdr->frame_control))
|
|
txdesc->txop = TXOP_BACKOFF;
|
|
else if (!(tx_info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT))
|
|
txdesc->txop = TXOP_SIFS;
|
|
else
|
|
txdesc->txop = TXOP_HTTXOP;
|
|
}
|
|
|
|
u16 rt2x00ht_center_channel(struct rt2x00_dev *rt2x00dev,
|
|
struct ieee80211_conf *conf)
|
|
{
|
|
struct hw_mode_spec *spec = &rt2x00dev->spec;
|
|
int center_channel;
|
|
u16 i;
|
|
|
|
/*
|
|
* Initialize center channel to current channel.
|
|
*/
|
|
center_channel = spec->channels[conf->channel->hw_value].channel;
|
|
|
|
/*
|
|
* Adjust center channel to HT40+ and HT40- operation.
|
|
*/
|
|
if (conf_is_ht40_plus(conf))
|
|
center_channel += 2;
|
|
else if (conf_is_ht40_minus(conf))
|
|
center_channel -= (center_channel == 14) ? 1 : 2;
|
|
|
|
for (i = 0; i < spec->num_channels; i++)
|
|
if (spec->channels[i].channel == center_channel)
|
|
return i;
|
|
|
|
WARN_ON(1);
|
|
return conf->channel->hw_value;
|
|
}
|