26a1d07f41
HT and no-HT rt2x00 devices use a partly different TX descriptor. Optimize the tx desciptor memory layout by putting the PLCP and HT substructs into a union and introduce a new driver flag to decide which TX desciptor format is used by the device. This saves us the expensive PLCP calculation fOr HT devices and the HT descriptor setup on no-HT devices. Acked-by: Gertjan van Wingerde <gwingerde@gmail.com> Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com> Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
141 lines
4.2 KiB
C
141 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->u.ht.mpdu_density =
|
|
tx_info->control.sta->ht_cap.ampdu_density;
|
|
|
|
txdesc->u.ht.ba_size = 7; /* FIXME: What value is needed? */
|
|
|
|
txdesc->u.ht.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->u.ht.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->u.ht.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->u.ht.mcs = rt2x00_get_rate_mcs(hwrate->mcs);
|
|
if (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
|
|
txdesc->u.ht.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->u.ht.txop = TXOP_BACKOFF;
|
|
else if (!(tx_info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT))
|
|
txdesc->u.ht.txop = TXOP_SIFS;
|
|
else
|
|
txdesc->u.ht.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;
|
|
}
|