drivers/net/wireless/rtlwifi/rc.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2009-2012  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  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  * Contact Information:
  22  * wlanfae <wlanfae@realtek.com>
  23  * Realtek Corporation, No. 2, Innovation Road II, Hsinchu Science Park,
  24  * Hsinchu 300, Taiwan.
  25  *
  26  * Larry Finger <Larry.Finger@lwfinger.net>
  27  *
  28  *****************************************************************************/
  29
  30 #include "wifi.h"
  31 #include "base.h"
  32 #include "rc.h"
  33
  34 /*
  35  *Finds the highest rate index we can use
  36  *if skb is special data like DHCP/EAPOL, we set should
  37  *it to lowest rate CCK_1M, otherwise we set rate to
  38  *CCK11M or OFDM_54M based on wireless mode.
  39  */
  40 static u8 _rtl_rc_get_highest_rix(struct rtl_priv *rtlpriv,
  41                                   struct ieee80211_sta *sta,
  42                                   struct sk_buff *skb, bool not_data)
  43 {
  44         struct rtl_mac *rtlmac = rtl_mac(rtlpriv);
  45         struct rtl_hal *rtlhal = rtl_hal(rtlpriv);
  46         struct rtl_phy *rtlphy = &(rtlpriv->phy);
  47         struct rtl_sta_info *sta_entry = NULL;
  48         u8 wireless_mode = 0;
  49
  50         /*
  51          *this rate is no use for true rate, firmware
  52          *will control rate at all it just used for
  53          *1.show in iwconfig in B/G mode
  54          *2.in rtl_get_tcb_desc when we check rate is
  55          *      1M we will not use FW rate but user rate.
  56          */
  57         if (rtlmac->opmode == NL80211_IFTYPE_AP ||
  58             rtlmac->opmode == NL80211_IFTYPE_ADHOC ||
  59             rtlmac->opmode == NL80211_IFTYPE_MESH_POINT) {
  60                 if (sta) {
  61                         sta_entry = (struct rtl_sta_info *) sta->drv_priv;
  62                         wireless_mode = sta_entry->wireless_mode;
  63                 } else {
  64                         return 0;
  65                 }
  66         } else {
  67                 wireless_mode = rtlmac->mode;
  68         }
  69
  70         if (rtl_is_special_data(rtlpriv->mac80211.hw, skb, true) ||
  71                         not_data) {
  72                 return 0;
  73         } else {
  74                 if (rtlhal->current_bandtype == BAND_ON_2_4G) {
  75                         if (wireless_mode == WIRELESS_MODE_B) {
  76                                 return B_MODE_MAX_RIX;
  77                         } else if (wireless_mode == WIRELESS_MODE_G) {
  78                                 return G_MODE_MAX_RIX;
  79                         } else {
  80                                 if (get_rf_type(rtlphy) != RF_2T2R)
  81                                         return N_MODE_MCS7_RIX;
  82                                 else
  83                                         return N_MODE_MCS15_RIX;
  84                         }
  85                 } else {
  86                         if (wireless_mode == WIRELESS_MODE_A) {
  87                                 return A_MODE_MAX_RIX;
  88                         } else {
  89                                 if (get_rf_type(rtlphy) != RF_2T2R)
  90                                         return N_MODE_MCS7_RIX;
  91                                 else
  92                                         return N_MODE_MCS15_RIX;
  93                         }
  94                 }
  95         }
  96 }
  97
  98 static void _rtl_rc_rate_set_series(struct rtl_priv *rtlpriv,
  99                                     struct ieee80211_sta *sta,
 100                                     struct ieee80211_tx_rate *rate,
 101                                     struct ieee80211_tx_rate_control *txrc,
 102                                     u8 tries, char rix, int rtsctsenable,
 103                                     bool not_data)
 104 {
 105         struct rtl_mac *mac = rtl_mac(rtlpriv);
 106         u8 sgi_20 = 0, sgi_40 = 0;
 107
 108         if (sta) {
 109                 sgi_20 = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_20;
 110                 sgi_40 = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_40;
 111         }
 112         rate->count = tries;
 113         rate->idx = rix >= 0x00 ? rix : 0x00;
 114
 115         if (!not_data) {
 116                 if (txrc->short_preamble)
 117                         rate->flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
 118                 if (mac->opmode == NL80211_IFTYPE_AP ||
 119                         mac->opmode == NL80211_IFTYPE_ADHOC) {
 120                         if (sta && (sta->ht_cap.cap &
 121                             IEEE80211_HT_CAP_SUP_WIDTH_20_40))
 122                                 rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
 123                 } else {
 124                         if (mac->bw_40)
 125                                 rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
 126                 }
 127                 if (sgi_20 || sgi_40)
 128                         rate->flags |= IEEE80211_TX_RC_SHORT_GI;
 129                 if (sta && sta->ht_cap.ht_supported)
 130                         rate->flags |= IEEE80211_TX_RC_MCS;
 131         }
 132 }
 133
 134 static void rtl_get_rate(void *ppriv, struct ieee80211_sta *sta,
 135                          void *priv_sta, struct ieee80211_tx_rate_control *txrc)
 136 {
 137         struct rtl_priv *rtlpriv = ppriv;
 138         struct sk_buff *skb = txrc->skb;
 139         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
 140         struct ieee80211_tx_rate *rates = tx_info->control.rates;
 141         __le16 fc = rtl_get_fc(skb);
 142         u8 try_per_rate, i, rix;
 143         bool not_data = !ieee80211_is_data(fc);
 144
 145         if (rate_control_send_low(sta, priv_sta, txrc))
 146                 return;
 147
 148         rix = _rtl_rc_get_highest_rix(rtlpriv, sta, skb, not_data);
 149         try_per_rate = 1;
 150         _rtl_rc_rate_set_series(rtlpriv, sta, &rates[0], txrc,
 151                                 try_per_rate, rix, 1, not_data);
 152
 153         if (!not_data) {
 154                 for (i = 1; i < 4; i++)
 155                         _rtl_rc_rate_set_series(rtlpriv, sta, &rates[i],
 156                                                 txrc, i, (rix - i), 1,
 157                                                 not_data);
 158         }
 159 }
 160
 161 static bool _rtl_tx_aggr_check(struct rtl_priv *rtlpriv,
 162                 struct rtl_sta_info *sta_entry, u16 tid)
 163 {
 164         struct rtl_mac *mac = rtl_mac(rtlpriv);
 165
 166         if (mac->act_scanning)
 167                 return false;
 168
 169         if (mac->opmode == NL80211_IFTYPE_STATION &&
 170                 mac->cnt_after_linked < 3)
 171                 return false;
 172
 173         if (sta_entry->tids[tid].agg.agg_state == RTL_AGG_STOP)
 174                 return true;
 175
 176         return false;
 177 }
 178
 179 /*mac80211 Rate Control callbacks*/
 180 static void rtl_tx_status(void *ppriv,
 181                           struct ieee80211_supported_band *sband,
 182                           struct ieee80211_sta *sta, void *priv_sta,
 183                           struct sk_buff *skb)
 184 {
 185         struct rtl_priv *rtlpriv = ppriv;
 186         struct rtl_mac *mac = rtl_mac(rtlpriv);
 187         struct ieee80211_hdr *hdr = rtl_get_hdr(skb);
 188         __le16 fc = rtl_get_fc(skb);
 189         struct rtl_sta_info *sta_entry;
 190
 191         if (!priv_sta || !ieee80211_is_data(fc))
 192                 return;
 193
 194         if (rtl_is_special_data(mac->hw, skb, true))
 195                 return;
 196
 197         if (is_multicast_ether_addr(ieee80211_get_DA(hdr))
 198             || is_broadcast_ether_addr(ieee80211_get_DA(hdr)))
 199                 return;
 200
 201         if (sta) {
 202                 /* Check if aggregation has to be enabled for this tid */
 203                 sta_entry = (struct rtl_sta_info *) sta->drv_priv;
 204                 if ((sta->ht_cap.ht_supported) &&
 205                                 !(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
 206                         if (ieee80211_is_data_qos(fc)) {
 207                                 u8 tid = rtl_get_tid(skb);
 208                                 if (_rtl_tx_aggr_check(rtlpriv, sta_entry,
 209                                     tid)) {
 210                                         sta_entry->tids[tid].agg.agg_state =
 211                                                          RTL_AGG_PROGRESS;
 212                                         ieee80211_start_tx_ba_session(sta,
 213                                                                  tid, 5000);
 214                                 }
 215                         }
 216                 }
 217         }
 218 }
 219
 220 static void rtl_rate_init(void *ppriv,
 221                           struct ieee80211_supported_band *sband,
 222                           struct ieee80211_sta *sta, void *priv_sta)
 223 {
 224 }
 225
 226 static void rtl_rate_update(void *ppriv,
 227                             struct ieee80211_supported_band *sband,
 228                             struct ieee80211_sta *sta, void *priv_sta,
 229                             u32 changed)
 230 {
 231 }
 232
 233 static void *rtl_rate_alloc(struct ieee80211_hw *hw,
 234                 struct dentry *debugfsdir)
 235 {
 236         struct rtl_priv *rtlpriv = rtl_priv(hw);
 237         return rtlpriv;
 238 }
 239
 240 static void rtl_rate_free(void *rtlpriv)
 241 {
 242         return;
 243 }
 244
 245 static void *rtl_rate_alloc_sta(void *ppriv,
 246                                 struct ieee80211_sta *sta, gfp_t gfp)
 247 {
 248         struct rtl_priv *rtlpriv = ppriv;
 249         struct rtl_rate_priv *rate_priv;
 250
 251         rate_priv = kzalloc(sizeof(struct rtl_rate_priv), gfp);
 252         if (!rate_priv) {
 253                 RT_TRACE(rtlpriv, COMP_ERR, DBG_EMERG,
 254                          "Unable to allocate private rc structure\n");
 255                 return NULL;
 256         }
 257
 258         rtlpriv->rate_priv = rate_priv;
 259
 260         return rate_priv;
 261 }
 262
 263 static void rtl_rate_free_sta(void *rtlpriv,
 264                               struct ieee80211_sta *sta, void *priv_sta)
 265 {
 266         struct rtl_rate_priv *rate_priv = priv_sta;
 267         kfree(rate_priv);
 268 }
 269
 270 static struct rate_control_ops rtl_rate_ops = {
 271         .module = NULL,
 272         .name = "rtl_rc",
 273         .alloc = rtl_rate_alloc,
 274         .free = rtl_rate_free,
 275         .alloc_sta = rtl_rate_alloc_sta,
 276         .free_sta = rtl_rate_free_sta,
 277         .rate_init = rtl_rate_init,
 278         .rate_update = rtl_rate_update,
 279         .tx_status = rtl_tx_status,
 280         .get_rate = rtl_get_rate,
 281 };
 282
 283 int rtl_rate_control_register(void)
 284 {
 285         return ieee80211_rate_control_register(&rtl_rate_ops);
 286 }
 287
 288 void rtl_rate_control_unregister(void)
 289 {
 290         ieee80211_rate_control_unregister(&rtl_rate_ops);
 291 }