forked from Minki/linux
351151e8ac
For STBC transmissions rt2x00 used the number of RxSTBC streams the destination STA indicates in its HT capabilities as STBC value in the TXWI. However, the legacy drivers and our own comment in rt2800.h suggest that the STBC field in the TXWI only allows a value of 0 or 1. The values 2 and 3 are reserved (probably for future devices). And indeed, STBC transmissions to STAs indicating more then 1 RxSTBC stream fail when the STBC field is set to something >1. Fix this by only setting the STBC field to 1 when STBC should be used. Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com> Acked-by: Gertjan van Wingerde <gwingerde@gmail.com> Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
137 lines
4.0 KiB
C
137 lines
4.0 KiB
C
/*
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Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
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<http://rt2x00.serialmonkey.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the
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Free Software Foundation, Inc.,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/*
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Module: rt2x00lib
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Abstract: rt2x00 HT specific routines.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include "rt2x00.h"
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#include "rt2x00lib.h"
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void rt2x00ht_create_tx_descriptor(struct queue_entry *entry,
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struct txentry_desc *txdesc,
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const struct rt2x00_rate *hwrate)
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{
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struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
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struct ieee80211_tx_rate *txrate = &tx_info->control.rates[0];
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data;
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if (tx_info->control.sta)
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txdesc->u.ht.mpdu_density =
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tx_info->control.sta->ht_cap.ampdu_density;
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txdesc->u.ht.ba_size = 7; /* FIXME: What value is needed? */
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/*
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* Only one STBC stream is supported for now.
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*/
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if (tx_info->flags & IEEE80211_TX_CTL_STBC)
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txdesc->u.ht.stbc = 1;
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/*
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* If IEEE80211_TX_RC_MCS is set txrate->idx just contains the
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* mcs rate to be used
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*/
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if (txrate->flags & IEEE80211_TX_RC_MCS) {
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txdesc->u.ht.mcs = txrate->idx;
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/*
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* MIMO PS should be set to 1 for STA's using dynamic SM PS
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* when using more then one tx stream (>MCS7).
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*/
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if (tx_info->control.sta && txdesc->u.ht.mcs > 7 &&
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((tx_info->control.sta->ht_cap.cap &
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IEEE80211_HT_CAP_SM_PS) >>
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IEEE80211_HT_CAP_SM_PS_SHIFT) ==
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WLAN_HT_CAP_SM_PS_DYNAMIC)
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__set_bit(ENTRY_TXD_HT_MIMO_PS, &txdesc->flags);
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} else {
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txdesc->u.ht.mcs = rt2x00_get_rate_mcs(hwrate->mcs);
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if (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
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txdesc->u.ht.mcs |= 0x08;
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}
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/*
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* This frame is eligible for an AMPDU, however, don't aggregate
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* frames that are intended to probe a specific tx rate.
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*/
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if (tx_info->flags & IEEE80211_TX_CTL_AMPDU &&
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!(tx_info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE))
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__set_bit(ENTRY_TXD_HT_AMPDU, &txdesc->flags);
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/*
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* Set 40Mhz mode if necessary (for legacy rates this will
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* duplicate the frame to both channels).
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*/
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if (txrate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH ||
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txrate->flags & IEEE80211_TX_RC_DUP_DATA)
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__set_bit(ENTRY_TXD_HT_BW_40, &txdesc->flags);
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if (txrate->flags & IEEE80211_TX_RC_SHORT_GI)
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__set_bit(ENTRY_TXD_HT_SHORT_GI, &txdesc->flags);
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/*
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* Determine IFS values
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* - Use TXOP_BACKOFF for management frames
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* - Use TXOP_SIFS for fragment bursts
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* - Use TXOP_HTTXOP for everything else
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*
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* Note: rt2800 devices won't use CTS protection (if used)
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* for frames not transmitted with TXOP_HTTXOP
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*/
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if (ieee80211_is_mgmt(hdr->frame_control))
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txdesc->u.ht.txop = TXOP_BACKOFF;
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else if (!(tx_info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT))
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txdesc->u.ht.txop = TXOP_SIFS;
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else
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txdesc->u.ht.txop = TXOP_HTTXOP;
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}
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u16 rt2x00ht_center_channel(struct rt2x00_dev *rt2x00dev,
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struct ieee80211_conf *conf)
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{
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struct hw_mode_spec *spec = &rt2x00dev->spec;
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int center_channel;
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u16 i;
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/*
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* Initialize center channel to current channel.
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*/
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center_channel = spec->channels[conf->channel->hw_value].channel;
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/*
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* Adjust center channel to HT40+ and HT40- operation.
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*/
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if (conf_is_ht40_plus(conf))
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center_channel += 2;
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else if (conf_is_ht40_minus(conf))
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center_channel -= (center_channel == 14) ? 1 : 2;
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for (i = 0; i < spec->num_channels; i++)
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if (spec->channels[i].channel == center_channel)
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return i;
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WARN_ON(1);
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return conf->channel->hw_value;
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}
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