projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 35f00cfc | 1 | /* |
| 9c9a0d14 | 2 | Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com> |
| 35f00cfc ID |
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 | ||
| 32 | void 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]; | |
| 1affa091 | 38 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data; |
| 35f00cfc ID |
39 | |
| 40 | if (tx_info->control.sta) | |
| 41 | txdesc->mpdu_density = | |
| 42 | tx_info->control.sta->ht_cap.ampdu_density; | |
| 35f00cfc ID |
43 | |
| 44 | txdesc->ba_size = 7; /* FIXME: What value is needed? */ | |
| bd96bd6b ID |
45 | |
| 46 | txdesc->stbc = | |
| 47 | (tx_info->flags & IEEE80211_TX_CTL_STBC) >> IEEE80211_TX_CTL_STBC_SHIFT; | |
| 35f00cfc | 48 | |
| df7f4ebe HS |
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->mcs = txrate->idx; | |
| 84804cdc ID |
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->mcs > 7 && | |
| a13ac9df HS |
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) | |
| 84804cdc | 65 | __set_bit(ENTRY_TXD_HT_MIMO_PS, &txdesc->flags); |
| df7f4ebe HS |
66 | } else { |
| 67 | txdesc->mcs = rt2x00_get_rate_mcs(hwrate->mcs); | |
| 68 | if (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE) | |
| 69 | txdesc->mcs |= 0x08; | |
| 70 | } | |
| 71 | ||
| 35f00cfc ID |
72 | |
| 73 | /* | |
| 01e946f2 HS |
74 | * This frame is eligible for an AMPDU, however, don't aggregate |
| 75 | * frames that are intended to probe a specific tx rate. | |
| 35f00cfc | 76 | */ |
| 01e946f2 HS |
77 | if (tx_info->flags & IEEE80211_TX_CTL_AMPDU && |
| 78 | !(tx_info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)) | |
| 35f00cfc ID |
79 | __set_bit(ENTRY_TXD_HT_AMPDU, &txdesc->flags); |
| 80 | ||
| 81 | /* | |
| 82 | * Determine HT Mix/Greenfield rate mode | |
| 83 | */ | |
| 84 | if (txrate->flags & IEEE80211_TX_RC_MCS) | |
| 85 | txdesc->rate_mode = RATE_MODE_HT_MIX; | |
| 86 | if (txrate->flags & IEEE80211_TX_RC_GREEN_FIELD) | |
| 87 | txdesc->rate_mode = RATE_MODE_HT_GREENFIELD; | |
| cb753b72 HS |
88 | |
| 89 | /* | |
| 90 | * Set 40Mhz mode if necessary (for legacy rates this will | |
| 91 | * duplicate the frame to both channels). | |
| 92 | */ | |
| 93 | if (txrate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH || | |
| 94 | txrate->flags & IEEE80211_TX_RC_DUP_DATA) | |
| 35f00cfc ID |
95 | __set_bit(ENTRY_TXD_HT_BW_40, &txdesc->flags); |
| 96 | if (txrate->flags & IEEE80211_TX_RC_SHORT_GI) | |
| 97 | __set_bit(ENTRY_TXD_HT_SHORT_GI, &txdesc->flags); | |
| 1affa091 HS |
98 | |
| 99 | /* | |
| 100 | * Determine IFS values | |
| 101 | * - Use TXOP_BACKOFF for management frames | |
| 102 | * - Use TXOP_SIFS for fragment bursts | |
| 103 | * - Use TXOP_HTTXOP for everything else | |
| 104 | * | |
| 105 | * Note: rt2800 devices won't use CTS protection (if used) | |
| 106 | * for frames not transmitted with TXOP_HTTXOP | |
| 107 | */ | |
| 108 | if (ieee80211_is_mgmt(hdr->frame_control)) | |
| 109 | txdesc->txop = TXOP_BACKOFF; | |
| 110 | else if (!(tx_info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT)) | |
| 111 | txdesc->txop = TXOP_SIFS; | |
| 112 | else | |
| 113 | txdesc->txop = TXOP_HTTXOP; | |
| 35f00cfc | 114 | } |
| 06443e46 GW |
115 | |
| 116 | u16 rt2x00ht_center_channel(struct rt2x00_dev *rt2x00dev, | |
| 117 | struct ieee80211_conf *conf) | |
| 118 | { | |
| 119 | struct hw_mode_spec *spec = &rt2x00dev->spec; | |
| 120 | int center_channel; | |
| 121 | u16 i; | |
| 122 | ||
| 123 | /* | |
| 124 | * Initialize center channel to current channel. | |
| 125 | */ | |
| 126 | center_channel = spec->channels[conf->channel->hw_value].channel; | |
| 127 | ||
| 128 | /* | |
| 129 | * Adjust center channel to HT40+ and HT40- operation. | |
| 130 | */ | |
| 131 | if (conf_is_ht40_plus(conf)) | |
| 132 | center_channel += 2; | |
| 133 | else if (conf_is_ht40_minus(conf)) | |
| 134 | center_channel -= (center_channel == 14) ? 1 : 2; | |
| 135 | ||
| 136 | for (i = 0; i < spec->num_channels; i++) | |
| 137 | if (spec->channels[i].channel == center_channel) | |
| 138 | return i; | |
| 139 | ||
| 140 | WARN_ON(1); | |
| 141 | return conf->channel->hw_value; | |
| 142 | } |