1/* 2 Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com> 3 <http://rt2x00.serialmonkey.com> 4 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. 9 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. 14 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. 19 */ 20 21/* 22 Module: rt2x00lib 23 Abstract: rt2x00 HT specific routines. 24 */ 25 26#include <linux/kernel.h> 27#include <linux/module.h> 28 29#include "rt2x00.h" 30#include "rt2x00lib.h" 31 32void rt2x00ht_create_tx_descriptor(struct queue_entry *entry, 33 struct txentry_desc *txdesc, 34 const struct rt2x00_rate *hwrate) 35{ 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; 39 40 if (tx_info->control.sta) 41 txdesc->u.ht.mpdu_density = 42 tx_info->control.sta->ht_cap.ampdu_density; 43 44 txdesc->u.ht.ba_size = 7; /* FIXME: What value is needed? */ 45 46 txdesc->u.ht.stbc = 47 (tx_info->flags & IEEE80211_TX_CTL_STBC) >> IEEE80211_TX_CTL_STBC_SHIFT; 48 49 /* 50 * If IEEE80211_TX_RC_MCS is set txrate->idx just contains the 51 * mcs rate to be used 52 */ 53 if (txrate->flags & IEEE80211_TX_RC_MCS) { 54 txdesc->u.ht.mcs = txrate->idx; 55 56 /* 57 * MIMO PS should be set to 1 for STA's using dynamic SM PS 58 * when using more then one tx stream (>MCS7). 59 */ 60 if (tx_info->control.sta && txdesc->u.ht.mcs > 7 && 61 ((tx_info->control.sta->ht_cap.cap & 62 IEEE80211_HT_CAP_SM_PS) >> 63 IEEE80211_HT_CAP_SM_PS_SHIFT) == 64 WLAN_HT_CAP_SM_PS_DYNAMIC) 65 __set_bit(ENTRY_TXD_HT_MIMO_PS, &txdesc->flags); 66 } else { 67 txdesc->u.ht.mcs = rt2x00_get_rate_mcs(hwrate->mcs); 68 if (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE) 69 txdesc->u.ht.mcs |= 0x08; 70 } 71 72 /* 73 * This frame is eligible for an AMPDU, however, don't aggregate 74 * frames that are intended to probe a specific tx rate. 75 */ 76 if (tx_info->flags & IEEE80211_TX_CTL_AMPDU && 77 !(tx_info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)) 78 __set_bit(ENTRY_TXD_HT_AMPDU, &txdesc->flags); 79 80 /* 81 * Set 40Mhz mode if necessary (for legacy rates this will 82 * duplicate the frame to both channels). 83 */ 84 if (txrate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH || 85 txrate->flags & IEEE80211_TX_RC_DUP_DATA) 86 __set_bit(ENTRY_TXD_HT_BW_40, &txdesc->flags); 87 if (txrate->flags & IEEE80211_TX_RC_SHORT_GI) 88 __set_bit(ENTRY_TXD_HT_SHORT_GI, &txdesc->flags); 89 90 /* 91 * Determine IFS values 92 * - Use TXOP_BACKOFF for management frames 93 * - Use TXOP_SIFS for fragment bursts 94 * - Use TXOP_HTTXOP for everything else 95 * 96 * Note: rt2800 devices won't use CTS protection (if used) 97 * for frames not transmitted with TXOP_HTTXOP 98 */ 99 if (ieee80211_is_mgmt(hdr->frame_control)) 100 txdesc->u.ht.txop = TXOP_BACKOFF; 101 else if (!(tx_info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT)) 102 txdesc->u.ht.txop = TXOP_SIFS; 103 else 104 txdesc->u.ht.txop = TXOP_HTTXOP; 105} 106 107u16 rt2x00ht_center_channel(struct rt2x00_dev *rt2x00dev, 108 struct ieee80211_conf *conf) 109{ 110 struct hw_mode_spec *spec = &rt2x00dev->spec; 111 int center_channel; 112 u16 i; 113 114 /* 115 * Initialize center channel to current channel. 116 */ 117 center_channel = spec->channels[conf->channel->hw_value].channel; 118 119 /* 120 * Adjust center channel to HT40+ and HT40- operation. 121 */ 122 if (conf_is_ht40_plus(conf)) 123 center_channel += 2; 124 else if (conf_is_ht40_minus(conf)) 125 center_channel -= (center_channel == 14) ? 1 : 2; 126 127 for (i = 0; i < spec->num_channels; i++) 128 if (spec->channels[i].channel == center_channel) 129 return i; 130 131 WARN_ON(1); 132 return conf->channel->hw_value; 133} 134