| /* |
| 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; |
| |
| 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; |
| } |