rt2x00ht.c 3.5 KB

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  1. /*
  2. Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
  3. <http://rt2x00.serialmonkey.com>
  4. This program is free software; you can redistribute it and/or modify
  5. it under the terms of the GNU General Public License as published by
  6. the Free Software Foundation; either version 2 of the License, or
  7. (at your option) any later version.
  8. This program is distributed in the hope that it will be useful,
  9. but WITHOUT ANY WARRANTY; without even the implied warranty of
  10. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11. GNU General Public License for more details.
  12. You should have received a copy of the GNU General Public License
  13. along with this program; if not, write to the
  14. Free Software Foundation, Inc.,
  15. 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  16. */
  17. /*
  18. Module: rt2x00lib
  19. Abstract: rt2x00 HT specific routines.
  20. */
  21. #include <linux/kernel.h>
  22. #include <linux/module.h>
  23. #include "rt2x00.h"
  24. #include "rt2x00lib.h"
  25. void rt2x00ht_create_tx_descriptor(struct queue_entry *entry,
  26. struct txentry_desc *txdesc,
  27. const struct rt2x00_rate *hwrate)
  28. {
  29. struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
  30. struct ieee80211_tx_rate *txrate = &tx_info->control.rates[0];
  31. struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data;
  32. if (tx_info->control.sta)
  33. txdesc->mpdu_density =
  34. tx_info->control.sta->ht_cap.ampdu_density;
  35. else
  36. txdesc->mpdu_density = 0;
  37. txdesc->ba_size = 7; /* FIXME: What value is needed? */
  38. txdesc->stbc =
  39. (tx_info->flags & IEEE80211_TX_CTL_STBC) >> IEEE80211_TX_CTL_STBC_SHIFT;
  40. /*
  41. * If IEEE80211_TX_RC_MCS is set txrate->idx just contains the
  42. * mcs rate to be used
  43. */
  44. if (txrate->flags & IEEE80211_TX_RC_MCS) {
  45. txdesc->mcs = txrate->idx;
  46. } else {
  47. txdesc->mcs = rt2x00_get_rate_mcs(hwrate->mcs);
  48. if (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
  49. txdesc->mcs |= 0x08;
  50. }
  51. /*
  52. * Convert flags
  53. */
  54. if (tx_info->flags & IEEE80211_TX_CTL_AMPDU)
  55. __set_bit(ENTRY_TXD_HT_AMPDU, &txdesc->flags);
  56. /*
  57. * Determine HT Mix/Greenfield rate mode
  58. */
  59. if (txrate->flags & IEEE80211_TX_RC_MCS)
  60. txdesc->rate_mode = RATE_MODE_HT_MIX;
  61. if (txrate->flags & IEEE80211_TX_RC_GREEN_FIELD)
  62. txdesc->rate_mode = RATE_MODE_HT_GREENFIELD;
  63. if (txrate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
  64. __set_bit(ENTRY_TXD_HT_BW_40, &txdesc->flags);
  65. if (txrate->flags & IEEE80211_TX_RC_SHORT_GI)
  66. __set_bit(ENTRY_TXD_HT_SHORT_GI, &txdesc->flags);
  67. /*
  68. * Determine IFS values
  69. * - Use TXOP_BACKOFF for management frames
  70. * - Use TXOP_SIFS for fragment bursts
  71. * - Use TXOP_HTTXOP for everything else
  72. *
  73. * Note: rt2800 devices won't use CTS protection (if used)
  74. * for frames not transmitted with TXOP_HTTXOP
  75. */
  76. if (ieee80211_is_mgmt(hdr->frame_control))
  77. txdesc->txop = TXOP_BACKOFF;
  78. else if (!(tx_info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT))
  79. txdesc->txop = TXOP_SIFS;
  80. else
  81. txdesc->txop = TXOP_HTTXOP;
  82. }
  83. u16 rt2x00ht_center_channel(struct rt2x00_dev *rt2x00dev,
  84. struct ieee80211_conf *conf)
  85. {
  86. struct hw_mode_spec *spec = &rt2x00dev->spec;
  87. int center_channel;
  88. u16 i;
  89. /*
  90. * Initialize center channel to current channel.
  91. */
  92. center_channel = spec->channels[conf->channel->hw_value].channel;
  93. /*
  94. * Adjust center channel to HT40+ and HT40- operation.
  95. */
  96. if (conf_is_ht40_plus(conf))
  97. center_channel += 2;
  98. else if (conf_is_ht40_minus(conf))
  99. center_channel -= (center_channel == 14) ? 1 : 2;
  100. for (i = 0; i < spec->num_channels; i++)
  101. if (spec->channels[i].channel == center_channel)
  102. return i;
  103. WARN_ON(1);
  104. return conf->channel->hw_value;
  105. }