drivers/net/wireless/rt2x00/rt2x00ht.c

   1 /*
   2         Copyright (C) 2004 - 2009 rt2x00 SourceForge Project
   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];
  38
  39         if (tx_info->control.sta)
  40                 txdesc->mpdu_density =
  41                     tx_info->control.sta->ht_cap.ampdu_density;
  42         else
  43                 txdesc->mpdu_density = 0;
  44
  45         txdesc->ba_size = 7;    /* FIXME: What value is needed? */
  46         txdesc->stbc = 0;       /* FIXME: What value is needed? */
  47
  48         txdesc->mcs = rt2x00_get_rate_mcs(hwrate->mcs);
  49         if (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
  50                 txdesc->mcs |= 0x08;
  51
  52         /*
  53          * Convert flags
  54          */
  55         if (tx_info->flags & IEEE80211_TX_CTL_AMPDU)
  56                 __set_bit(ENTRY_TXD_HT_AMPDU, &txdesc->flags);
  57
  58         /*
  59          * Determine HT Mix/Greenfield rate mode
  60          */
  61         if (txrate->flags & IEEE80211_TX_RC_MCS)
  62                 txdesc->rate_mode = RATE_MODE_HT_MIX;
  63         if (txrate->flags & IEEE80211_TX_RC_GREEN_FIELD)
  64                 txdesc->rate_mode = RATE_MODE_HT_GREENFIELD;
  65         if (txrate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
  66                 __set_bit(ENTRY_TXD_HT_BW_40, &txdesc->flags);
  67         if (txrate->flags & IEEE80211_TX_RC_SHORT_GI)
  68                 __set_bit(ENTRY_TXD_HT_SHORT_GI, &txdesc->flags);
  69 }