2 Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
3 <http://rt2x00.serialmonkey.com>
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.
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.
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.
23 Abstract: rt2x00 HT specific routines.
26 #include <linux/kernel.h>
27 #include <linux/module.h>
30 #include "rt2x00lib.h"
32 void rt2x00ht_create_tx_descriptor(struct queue_entry *entry,
33 struct txentry_desc *txdesc,
34 const struct rt2x00_rate *hwrate)
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;
40 if (tx_info->control.sta)
41 txdesc->mpdu_density =
42 tx_info->control.sta->ht_cap.ampdu_density;
44 txdesc->mpdu_density = 0;
46 txdesc->ba_size = 7; /* FIXME: What value is needed? */
47 txdesc->stbc = 0; /* FIXME: What value is needed? */
49 txdesc->mcs = rt2x00_get_rate_mcs(hwrate->mcs);
50 if (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
56 if (tx_info->flags & IEEE80211_TX_CTL_AMPDU)
57 __set_bit(ENTRY_TXD_HT_AMPDU, &txdesc->flags);
60 * Determine HT Mix/Greenfield rate mode
62 if (txrate->flags & IEEE80211_TX_RC_MCS)
63 txdesc->rate_mode = RATE_MODE_HT_MIX;
64 if (txrate->flags & IEEE80211_TX_RC_GREEN_FIELD)
65 txdesc->rate_mode = RATE_MODE_HT_GREENFIELD;
66 if (txrate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
67 __set_bit(ENTRY_TXD_HT_BW_40, &txdesc->flags);
68 if (txrate->flags & IEEE80211_TX_RC_SHORT_GI)
69 __set_bit(ENTRY_TXD_HT_SHORT_GI, &txdesc->flags);
72 * Determine IFS values
73 * - Use TXOP_BACKOFF for management frames
74 * - Use TXOP_SIFS for fragment bursts
75 * - Use TXOP_HTTXOP for everything else
77 * Note: rt2800 devices won't use CTS protection (if used)
78 * for frames not transmitted with TXOP_HTTXOP
80 if (ieee80211_is_mgmt(hdr->frame_control))
81 txdesc->txop = TXOP_BACKOFF;
82 else if (!(tx_info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT))
83 txdesc->txop = TXOP_SIFS;
85 txdesc->txop = TXOP_HTTXOP;