drivers/net/wireless/realtek/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  * 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 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 (rtl_is_special_data(rtlpriv->mac80211.hw, skb, true, false) ||
  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                         }
  76                         return 0;
  77                 } else {
  78                         if (wireless_mode == WIRELESS_MODE_A) {
  79                                 return A_MODE_MAX_RIX;
  80                         } else if (wireless_mode == WIRELESS_MODE_N_5G) {
  81                                 if (get_rf_type(rtlphy) != RF_2T2R)
  82                                         return N_MODE_MCS7_RIX;
  83                                 else
  84                                         return N_MODE_MCS15_RIX;
  85                         } else if (wireless_mode == WIRELESS_MODE_AC_5G) {
  86                                 return AC_MODE_MCS9_RIX;
  87                         }
  88                         return 0;
  89                 }
  90         }
  91 }
  92
  93 static void _rtl_rc_rate_set_series(struct rtl_priv *rtlpriv,
  94                                     struct ieee80211_sta *sta,
  95                                     struct ieee80211_tx_rate *rate,
  96                                     struct ieee80211_tx_rate_control *txrc,
  97                                     u8 tries, char rix, int rtsctsenable,
  98                                     bool not_data)
  99 {
 100         struct rtl_mac *mac = rtl_mac(rtlpriv);
 101         struct rtl_sta_info *sta_entry = NULL;
 102         u8 wireless_mode = 0;
 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                 sta_entry = (struct rtl_sta_info *)sta->drv_priv;
 110                 wireless_mode = sta_entry->wireless_mode;
 111         }
 112         rate->count = tries;
 113         rate->idx = rix >= 0x00 ? rix : 0x00;
 114         if (rtlpriv->rtlhal.hw_type == HARDWARE_TYPE_RTL8812AE &&
 115             wireless_mode == WIRELESS_MODE_AC_5G)
 116                 rate->idx += 0x10;/*2NSS for 8812AE*/
 117
 118         if (!not_data) {
 119                 if (txrc->short_preamble)
 120                         rate->flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
 121                 if (mac->opmode == NL80211_IFTYPE_AP ||
 122                         mac->opmode == NL80211_IFTYPE_ADHOC) {
 123                         if (sta && (sta->ht_cap.cap &
 124                                     IEEE80211_HT_CAP_SUP_WIDTH_20_40))
 125                                 rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
 126                         if (sta && (sta->vht_cap.vht_supported))
 127                                 rate->flags |= IEEE80211_TX_RC_80_MHZ_WIDTH;
 128                 } else {
 129                         if (mac->bw_40)
 130                                 rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
 131                         if (mac->bw_80)
 132                                 rate->flags |= IEEE80211_TX_RC_80_MHZ_WIDTH;
 133                 }
 134
 135                 if (sgi_20 || sgi_40 || sgi_80)
 136                         rate->flags |= IEEE80211_TX_RC_SHORT_GI;
 137                 if (sta && sta->ht_cap.ht_supported &&
 138                     ((wireless_mode == WIRELESS_MODE_N_5G) ||
 139                      (wireless_mode == WIRELESS_MODE_N_24G)))
 140                         rate->flags |= IEEE80211_TX_RC_MCS;
 141         }
 142 }
 143
 144 static void rtl_get_rate(void *ppriv, struct ieee80211_sta *sta,
 145                          void *priv_sta,
 146                          struct ieee80211_tx_rate_control *txrc)
 147 {
 148         struct rtl_priv *rtlpriv = ppriv;
 149         struct sk_buff *skb = txrc->skb;
 150         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
 151         struct ieee80211_tx_rate *rates = tx_info->control.rates;
 152         __le16 fc = rtl_get_fc(skb);
 153         u8 try_per_rate, i, rix;
 154         bool not_data = !ieee80211_is_data(fc);
 155
 156         if (rate_control_send_low(sta, priv_sta, txrc))
 157                 return;
 158
 159         rix = _rtl_rc_get_highest_rix(rtlpriv, sta, skb, not_data);
 160         try_per_rate = 1;
 161         _rtl_rc_rate_set_series(rtlpriv, sta, &rates[0], txrc,
 162                                 try_per_rate, rix, 1, not_data);
 163
 164         if (!not_data) {
 165                 for (i = 1; i < 4; i++)
 166                         _rtl_rc_rate_set_series(rtlpriv, sta, &rates[i],
 167                                                 txrc, i, (rix - i), 1,
 168                                                 not_data);
 169         }
 170 }
 171
 172 static bool _rtl_tx_aggr_check(struct rtl_priv *rtlpriv,
 173                                struct rtl_sta_info *sta_entry, u16 tid)
 174 {
 175         struct rtl_mac *mac = rtl_mac(rtlpriv);
 176
 177         if (mac->act_scanning)
 178                 return false;
 179
 180         if (mac->opmode == NL80211_IFTYPE_STATION &&
 181             mac->cnt_after_linked < 3)
 182                 return false;
 183
 184         if (sta_entry->tids[tid].agg.agg_state == RTL_AGG_STOP)
 185                 return true;
 186
 187         return false;
 188 }
 189
 190 /*mac80211 Rate Control callbacks*/
 191 static void rtl_tx_status(void *ppriv,
 192                           struct ieee80211_supported_band *sband,
 193                           struct ieee80211_sta *sta, void *priv_sta,
 194                           struct sk_buff *skb)
 195 {
 196         struct rtl_priv *rtlpriv = ppriv;
 197         struct rtl_mac *mac = rtl_mac(rtlpriv);
 198         struct ieee80211_hdr *hdr = rtl_get_hdr(skb);
 199         __le16 fc = rtl_get_fc(skb);
 200         struct rtl_sta_info *sta_entry;
 201
 202         if (!priv_sta || !ieee80211_is_data(fc))
 203                 return;
 204
 205         if (rtl_is_special_data(mac->hw, skb, true, true))
 206                 return;
 207
 208         if (is_multicast_ether_addr(ieee80211_get_DA(hdr)) ||
 209             is_broadcast_ether_addr(ieee80211_get_DA(hdr)))
 210                 return;
 211
 212         if (sta) {
 213                 /* Check if aggregation has to be enabled for this tid */
 214                 sta_entry = (struct rtl_sta_info *) sta->drv_priv;
 215                 if ((sta->ht_cap.ht_supported) &&
 216                     !(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
 217                         if (ieee80211_is_data_qos(fc)) {
 218                                 u8 tid = rtl_get_tid(skb);
 219                                 if (_rtl_tx_aggr_check(rtlpriv, sta_entry,
 220                                                        tid)) {
 221                                         sta_entry->tids[tid].agg.agg_state =
 222                                                 RTL_AGG_PROGRESS;
 223                                         ieee80211_start_tx_ba_session(sta, tid,
 224                                                                       5000);
 225                                 }
 226                         }
 227                 }
 228         }
 229 }
 230
 231 static void rtl_rate_init(void *ppriv,
 232                           struct ieee80211_supported_band *sband,
 233                           struct cfg80211_chan_def *chandef,
 234                           struct ieee80211_sta *sta, void *priv_sta)
 235 {
 236 }
 237
 238 static void rtl_rate_update(void *ppriv,
 239                             struct ieee80211_supported_band *sband,
 240                             struct cfg80211_chan_def *chandef,
 241                             struct ieee80211_sta *sta, void *priv_sta,
 242                             u32 changed)
 243 {
 244 }
 245
 246 static void *rtl_rate_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
 247 {
 248         struct rtl_priv *rtlpriv = rtl_priv(hw);
 249         return rtlpriv;
 250 }
 251
 252 static void rtl_rate_free(void *rtlpriv)
 253 {
 254         return;
 255 }
 256
 257 static void *rtl_rate_alloc_sta(void *ppriv,
 258                                 struct ieee80211_sta *sta, gfp_t gfp)
 259 {
 260         struct rtl_priv *rtlpriv = ppriv;
 261         struct rtl_rate_priv *rate_priv;
 262
 263         rate_priv = kzalloc(sizeof(struct rtl_rate_priv), gfp);
 264         if (!rate_priv) {
 265                 RT_TRACE(rtlpriv, COMP_ERR, DBG_EMERG,
 266                          "Unable to allocate private rc structure\n");
 267                 return NULL;
 268         }
 269
 270         rtlpriv->rate_priv = rate_priv;
 271
 272         return rate_priv;
 273 }
 274
 275 static void rtl_rate_free_sta(void *rtlpriv,
 276                               struct ieee80211_sta *sta, void *priv_sta)
 277 {
 278         struct rtl_rate_priv *rate_priv = priv_sta;
 279         kfree(rate_priv);
 280 }
 281
 282 static struct rate_control_ops rtl_rate_ops = {
 283         .name = "rtl_rc",
 284         .alloc = rtl_rate_alloc,
 285         .free = rtl_rate_free,
 286         .alloc_sta = rtl_rate_alloc_sta,
 287         .free_sta = rtl_rate_free_sta,
 288         .rate_init = rtl_rate_init,
 289         .rate_update = rtl_rate_update,
 290         .tx_status = rtl_tx_status,
 291         .get_rate = rtl_get_rate,
 292 };
 293
 294 int rtl_rate_control_register(void)
 295 {
 296         return ieee80211_rate_control_register(&rtl_rate_ops);
 297 }
 298
 299 void rtl_rate_control_unregister(void)
 300 {
 301         ieee80211_rate_control_unregister(&rtl_rate_ops);
 302 }