drivers/staging/rtl8192ee/rc.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2009-2010  Realtek Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * The full GNU General Public License is included in this distribution in the
  15  * file called LICENSE.
  16  *
  17  * Contact Information:
  18  * wlanfae <wlanfae@realtek.com>
  19  * Realtek Corporation, No. 2, Innovation Road II, Hsinchu Science Park,
  20  * Hsinchu 300, Taiwan.
  21  *
  22  * Larry Finger <Larry.Finger@lwfinger.net>
  23  *
  24  *****************************************************************************/
  25
  26 #include "wifi.h"
  27 #include "base.h"
  28 #include "rc.h"
  29
  30 /*
  31  *Finds the highest rate index we can use
  32  *if skb is special data like DHCP/EAPOL, we set should
  33  *it to lowest rate CCK_1M, otherwise we set rate to
  34  *highest rate based on wireless mode used for iwconfig
  35  *show Tx rate.
  36  */
  37 static u8 _rtl_rc_get_highest_rix(struct rtl_priv *rtlpriv,
  38                                   struct ieee80211_sta *sta,
  39                                   struct sk_buff *skb, bool not_data)
  40 {
  41         struct rtl_hal *rtlhal = rtl_hal(rtlpriv);
  42         struct rtl_phy *rtlphy = &(rtlpriv->phy);
  43         struct rtl_sta_info *sta_entry = NULL;
  44         u8 wireless_mode = 0;
  45
  46         /*
  47          *this rate is no use for true rate, firmware
  48          *will control rate at all it just used for
  49          *1.show in iwconfig in B/G mode
  50          *2.in stg_rtl_get_tcb_desc when we check rate is
  51          *      1M we will not use FW rate but user rate.
  52          */
  53
  54         if (sta) {
  55                 sta_entry = (struct rtl_sta_info *)sta->drv_priv;
  56                 wireless_mode = sta_entry->wireless_mode;
  57         }
  58
  59         if (rtl92e_is_special_data(rtlpriv->mac80211.hw, skb, true) ||
  60             not_data) {
  61                 return 0;
  62         } else {
  63                 if (rtlhal->current_bandtype == BAND_ON_2_4G) {
  64                         if (wireless_mode == WIRELESS_MODE_B) {
  65                                 return B_MODE_MAX_RIX;
  66                         } else if (wireless_mode == WIRELESS_MODE_G) {
  67                                 return G_MODE_MAX_RIX;
  68                         } else if (wireless_mode == WIRELESS_MODE_N_24G) {
  69                                 if (get_rf_type(rtlphy) != RF_2T2R)
  70                                         return N_MODE_MCS7_RIX;
  71                                 else
  72                                         return N_MODE_MCS15_RIX;
  73                         } else if (wireless_mode == WIRELESS_MODE_AC_24G) {
  74                                 return AC_MODE_MCS9_RIX;
  75                         } else {
  76                                 return 0;
  77                         }
  78                 } else {
  79                         if (wireless_mode == WIRELESS_MODE_A) {
  80                                 return A_MODE_MAX_RIX;
  81                         } else if (wireless_mode == WIRELESS_MODE_N_5G) {
  82                                 if (get_rf_type(rtlphy) != RF_2T2R)
  83                                         return N_MODE_MCS7_RIX;
  84                                 else
  85                                         return N_MODE_MCS15_RIX;
  86                         } else if (wireless_mode == WIRELESS_MODE_AC_5G) {
  87                                 return AC_MODE_MCS9_RIX;
  88                         } else {
  89                                 return 0;
  90                         }
  91                 }
  92         }
  93 }
  94
  95 static void _rtl_rc_rate_set_series(struct rtl_priv *rtlpriv,
  96                                     struct ieee80211_sta *sta,
  97                                     struct ieee80211_tx_rate *rate,
  98                                     struct ieee80211_tx_rate_control *txrc,
  99                                     u8 tries, char rix, int rtsctsenable,
 100                                     bool not_data)
 101 {
 102         struct rtl_mac *mac = rtl_mac(rtlpriv);
 103         u8 sgi_20 = 0, sgi_40 = 0, sgi_80 = 0;
 104
 105         if (sta) {
 106                 sgi_20 = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_20;
 107                 sgi_40 = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_40;
 108                 sgi_80 = sta->vht_cap.cap & IEEE80211_VHT_CAP_SHORT_GI_80;
 109         }
 110         rate->count = tries;
 111         rate->idx = rix >= 0x00 ? rix : 0x00;
 112
 113         if (!not_data) {
 114                 if (txrc->short_preamble)
 115                         rate->flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
 116                 if (mac->opmode == NL80211_IFTYPE_AP ||
 117                     mac->opmode == NL80211_IFTYPE_ADHOC) {
 118                         if (sta && (sta->ht_cap.cap &
 119                                     IEEE80211_HT_CAP_SUP_WIDTH_20_40))
 120                                 rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
 121                         if (sta && (sta->vht_cap.vht_supported))
 122                                 rate->flags |= IEEE80211_TX_RC_80_MHZ_WIDTH;
 123                 } else {
 124                         if (mac->bw_40)
 125                                 rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
 126                         if (mac->bw_80)
 127                                 rate->flags |= IEEE80211_TX_RC_80_MHZ_WIDTH;
 128                 }
 129
 130                 if (sgi_20 || sgi_40 || sgi_80)
 131                         rate->flags |= IEEE80211_TX_RC_SHORT_GI;
 132                 if (sta && sta->ht_cap.ht_supported)
 133                         rate->flags |= IEEE80211_TX_RC_MCS;
 134                 if (sta && sta->vht_cap.vht_supported)
 135                         rate->flags |= IEEE80211_TX_RC_VHT_MCS;
 136         }
 137 }
 138
 139 static void rtl_get_rate(void *ppriv, struct ieee80211_sta *sta,
 140                          void *priv_sta,
 141                          struct ieee80211_tx_rate_control *txrc)
 142 {
 143         struct rtl_priv *rtlpriv = ppriv;
 144         struct sk_buff *skb = txrc->skb;
 145         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
 146         struct ieee80211_tx_rate *rates = tx_info->control.rates;
 147         __le16 fc = rtl_get_fc(skb);
 148         u8 try_per_rate, i, rix;
 149         bool not_data = !ieee80211_is_data(fc);
 150
 151         if (rate_control_send_low(sta, priv_sta, txrc))
 152                 return;
 153
 154         rix = _rtl_rc_get_highest_rix(rtlpriv, sta, skb, not_data);
 155         try_per_rate = 1;
 156         _rtl_rc_rate_set_series(rtlpriv, sta, &rates[0], txrc,
 157                                 try_per_rate, rix, 1, not_data);
 158
 159         if (!not_data) {
 160                 for (i = 1; i < 4; i++)
 161                         _rtl_rc_rate_set_series(rtlpriv, sta, &rates[i],
 162                                                 txrc, i, (rix - i), 1,
 163                                                 not_data);
 164         }
 165 }
 166
 167 static bool _rtl_tx_aggr_check(struct rtl_priv *rtlpriv,
 168                                struct rtl_sta_info *sta_entry, u16 tid)
 169 {
 170         struct rtl_mac *mac = rtl_mac(rtlpriv);
 171
 172         if (mac->act_scanning)
 173                 return false;
 174
 175         if (mac->opmode == NL80211_IFTYPE_STATION &&
 176             mac->cnt_after_linked < 3)
 177                 return false;
 178
 179         if (sta_entry->tids[tid].agg.agg_state == RTL_AGG_STOP)
 180                 return true;
 181
 182         return false;
 183 }
 184
 185 /*mac80211 Rate Control callbacks*/
 186 static void rtl_tx_status(void *ppriv,
 187                           struct ieee80211_supported_band *sband,
 188                           struct ieee80211_sta *sta, void *priv_sta,
 189                           struct sk_buff *skb)
 190 {
 191         struct rtl_priv *rtlpriv = ppriv;
 192         struct rtl_mac *mac = rtl_mac(rtlpriv);
 193         struct ieee80211_hdr *hdr = rtl_get_hdr(skb);
 194         __le16 fc = rtl_get_fc(skb);
 195         struct rtl_sta_info *sta_entry;
 196
 197         if (!priv_sta || !ieee80211_is_data(fc))
 198                 return;
 199
 200         if (rtl92e_is_special_data(mac->hw, skb, true))
 201                 return;
 202
 203         if (is_multicast_ether_addr(ieee80211_get_DA(hdr)) ||
 204             is_broadcast_ether_addr(ieee80211_get_DA(hdr)))
 205                 return;
 206
 207         if (sta) {
 208                 /* Check if aggregation has to be enabled for this tid */
 209                 sta_entry = (struct rtl_sta_info *)sta->drv_priv;
 210                 if ((sta->ht_cap.ht_supported) &&
 211                     !(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
 212                         if (ieee80211_is_data_qos(fc)) {
 213                                 u8 tid = rtl_get_tid(skb);
 214                                 if (_rtl_tx_aggr_check(rtlpriv, sta_entry,
 215                                                        tid)) {
 216                                         sta_entry->tids[tid].agg.agg_state =
 217                                                 RTL_AGG_PROGRESS;
 218                                         ieee80211_start_tx_ba_session(sta, tid,
 219                                                                       5000);
 220                                 }
 221                         }
 222                 }
 223         }
 224 }
 225
 226 static void rtl_rate_init(void *ppriv,
 227                           struct ieee80211_supported_band *sband,
 228                           struct cfg80211_chan_def *chandef,
 229                           struct ieee80211_sta *sta, void *priv_sta)
 230 {
 231 }
 232
 233 static void *rtl_rate_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
 234 {
 235         struct rtl_priv *rtlpriv = rtl_priv(hw);
 236         return rtlpriv;
 237 }
 238
 239 static void rtl_rate_free(void *rtlpriv)
 240 {
 241         return;
 242 }
 243
 244 static void *rtl_rate_alloc_sta(void *ppriv,
 245                                 struct ieee80211_sta *sta, gfp_t gfp)
 246 {
 247         struct rtl_priv *rtlpriv = ppriv;
 248         struct rtl_rate_priv *rate_priv;
 249
 250         rate_priv = kzalloc(sizeof(*rate_priv), gfp);
 251         if (!rate_priv) {
 252                 RT_TRACE(COMP_ERR, DBG_EMERG,
 253                          ("Unable to allocate private rc structure\n"));
 254                 return NULL;
 255         }
 256
 257         rtlpriv->rate_priv = rate_priv;
 258
 259         return rate_priv;
 260 }
 261
 262 static void rtl_rate_free_sta(void *rtlpriv,
 263                               struct ieee80211_sta *sta, void *priv_sta)
 264 {
 265         struct rtl_rate_priv *rate_priv = priv_sta;
 266         kfree(rate_priv);
 267 }
 268
 269 static struct rate_control_ops rtl_rate_ops = {
 270         .name = "rtl_rc_92e",
 271         .alloc = rtl_rate_alloc,
 272         .free = rtl_rate_free,
 273         .alloc_sta = rtl_rate_alloc_sta,
 274         .free_sta = rtl_rate_free_sta,
 275         .rate_init = rtl_rate_init,
 276         .tx_status = rtl_tx_status,
 277         .get_rate = rtl_get_rate,
 278 };
 279
 280 int rtl92e_rate_control_register(void)
 281 {
 282         return ieee80211_rate_control_register(&rtl_rate_ops);
 283 }
 284
 285 void rtl92e_rate_control_unregister(void)
 286 {
 287         ieee80211_rate_control_unregister(&rtl_rate_ops);
 288 }