drivers/staging/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         u16 wireless_mode = 0;
  45         u8 nss; /* NSS -1 */
  46
  47         if (get_rf_type(rtlphy) >= RF_4T4R)
  48                 nss = 3;
  49         else if (get_rf_type(rtlphy) >= RF_3T3R)
  50                 nss = 2;
  51         else if (get_rf_type(rtlphy) >= RF_2T2R)
  52                 nss = 1;
  53         else
  54                 nss = 0;
  55
  56         /*
  57          *this rate is no use for true rate, firmware
  58          *will control rate at all it just used for
  59          *1.show in iwconfig in B/G mode
  60          *2.in rtl_get_tcb_desc when we check rate is
  61          *      1M we will not use FW rate but user rate.
  62          */
  63
  64         if (sta) {
  65                 sta_entry = (struct rtl_sta_info *)sta->drv_priv;
  66                 wireless_mode = sta_entry->wireless_mode;
  67         }
  68
  69         if (rtl_is_special_data(rtlpriv->mac80211.hw, skb, true, false) ||
  70             not_data) {
  71                 return 0;
  72         }
  73         if (rtlhal->current_bandtype == BAND_ON_2_4G) {
  74                 if (wireless_mode == WIRELESS_MODE_B) {
  75                         return B_MODE_MAX_RIX;
  76                 } else if (wireless_mode == WIRELESS_MODE_G) {
  77                         return G_MODE_MAX_RIX;
  78                 } else if (wireless_mode == WIRELESS_MODE_N_24G) {
  79                         if (nss == 0)
  80                                 return N_MODE_MCS7_RIX;
  81                         else
  82                                 return N_MODE_MCS15_RIX;
  83                 } else if (wireless_mode == WIRELESS_MODE_AC_24G) {
  84                         if (sta->bandwidth == IEEE80211_STA_RX_BW_20)
  85                                 return AC_MODE_MCS8_RIX | (nss << 4);
  86                         else
  87                                 return AC_MODE_MCS9_RIX | (nss << 4);
  88                 }
  89                 return 0;
  90         }
  91         if (wireless_mode == WIRELESS_MODE_A) {
  92                 return A_MODE_MAX_RIX;
  93         } else if (wireless_mode == WIRELESS_MODE_N_5G) {
  94                 if (nss == 0)
  95                         return N_MODE_MCS7_RIX;
  96                 else
  97                         return N_MODE_MCS15_RIX;
  98         } else if (wireless_mode == WIRELESS_MODE_AC_5G) {
  99                 if (sta->bandwidth == IEEE80211_STA_RX_BW_20)
 100                         return AC_MODE_MCS8_RIX | (nss << 4);
 101                 else
 102                         return AC_MODE_MCS9_RIX | (nss << 4);
 103         }
 104         return 0;
 105 }
 106
 107 static void _rtl_rc_rate_set_series(struct rtl_priv *rtlpriv,
 108                                     struct ieee80211_sta *sta,
 109                                     struct ieee80211_tx_rate *rate,
 110                                     struct ieee80211_tx_rate_control *txrc,
 111                                     u8 tries, s8 rix, int rtsctsenable,
 112                                     bool not_data)
 113 {
 114         struct rtl_mac *mac = rtl_mac(rtlpriv);
 115         struct rtl_sta_info *sta_entry = NULL;
 116         u16 wireless_mode = 0;
 117         u8 sgi_20 = 0, sgi_40 = 0, sgi_80 = 0;
 118
 119         if (sta) {
 120                 sgi_20 = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_20;
 121                 sgi_40 = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_40;
 122                 sgi_80 = sta->vht_cap.cap & IEEE80211_VHT_CAP_SHORT_GI_80;
 123                 sta_entry = (struct rtl_sta_info *)sta->drv_priv;
 124                 wireless_mode = sta_entry->wireless_mode;
 125         }
 126         rate->count = tries;
 127         rate->idx = rix >= 0x00 ? rix : 0x00;
 128         if (((rtlpriv->rtlhal.hw_type == HARDWARE_TYPE_RTL8812AE) ||
 129              (rtlpriv->rtlhal.hw_type == HARDWARE_TYPE_RTL8822BE)) &&
 130             wireless_mode == WIRELESS_MODE_AC_5G)
 131                 rate->idx |= 0x10;/*2NSS for 8812AE, 8822BE*/
 132
 133         if (!not_data) {
 134                 if (txrc->short_preamble)
 135                         rate->flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
 136                 if (mac->opmode == NL80211_IFTYPE_AP ||
 137                     mac->opmode == NL80211_IFTYPE_ADHOC) {
 138                         if (sta && (sta->ht_cap.cap &
 139                                     IEEE80211_HT_CAP_SUP_WIDTH_20_40))
 140                                 rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
 141                         if (sta && (sta->vht_cap.vht_supported))
 142                                 rate->flags |= IEEE80211_TX_RC_80_MHZ_WIDTH;
 143                 } else {
 144                         if (mac->bw_80)
 145                                 rate->flags |= IEEE80211_TX_RC_80_MHZ_WIDTH;
 146                         else if (mac->bw_40)
 147                                 rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
 148                 }
 149
 150                 if (sgi_20 || sgi_40 || sgi_80)
 151                         rate->flags |= IEEE80211_TX_RC_SHORT_GI;
 152                 if (sta && sta->ht_cap.ht_supported &&
 153                     ((wireless_mode == WIRELESS_MODE_N_5G) ||
 154                      (wireless_mode == WIRELESS_MODE_N_24G)))
 155                         rate->flags |= IEEE80211_TX_RC_MCS;
 156                 if (sta && sta->vht_cap.vht_supported &&
 157                     (wireless_mode == WIRELESS_MODE_AC_5G ||
 158                      wireless_mode == WIRELESS_MODE_AC_24G ||
 159                      wireless_mode == WIRELESS_MODE_AC_ONLY))
 160                         rate->flags |= IEEE80211_TX_RC_VHT_MCS;
 161         }
 162 }
 163
 164 static void rtl_get_rate(void *ppriv, struct ieee80211_sta *sta,
 165                          void *priv_sta,
 166                          struct ieee80211_tx_rate_control *txrc)
 167 {
 168         struct rtl_priv *rtlpriv = ppriv;
 169         struct sk_buff *skb = txrc->skb;
 170         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
 171         struct ieee80211_tx_rate *rates = tx_info->control.rates;
 172         __le16 fc = rtl_get_fc(skb);
 173         u8 try_per_rate, i, rix;
 174         bool not_data = !ieee80211_is_data(fc);
 175
 176         if (rate_control_send_low(sta, priv_sta, txrc))
 177                 return;
 178
 179         rix = _rtl_rc_get_highest_rix(rtlpriv, sta, skb, not_data);
 180         try_per_rate = 1;
 181         _rtl_rc_rate_set_series(rtlpriv, sta, &rates[0], txrc,
 182                                 try_per_rate, rix, 1, not_data);
 183
 184         if (!not_data) {
 185                 for (i = 1; i < 4; i++)
 186                         _rtl_rc_rate_set_series(rtlpriv, sta, &rates[i],
 187                                                 txrc, i, (rix - i), 1,
 188                                                 not_data);
 189         }
 190 }
 191
 192 static bool _rtl_tx_aggr_check(struct rtl_priv *rtlpriv,
 193                                struct rtl_sta_info *sta_entry, u16 tid)
 194 {
 195         struct rtl_mac *mac = rtl_mac(rtlpriv);
 196
 197         if (mac->act_scanning)
 198                 return false;
 199
 200         if (mac->opmode == NL80211_IFTYPE_STATION &&
 201             mac->cnt_after_linked < 3)
 202                 return false;
 203
 204         if (sta_entry->tids[tid].agg.agg_state == RTL_AGG_STOP)
 205                 return true;
 206
 207         return false;
 208 }
 209
 210 /*mac80211 Rate Control callbacks*/
 211 static void rtl_tx_status(void *ppriv,
 212                           struct ieee80211_supported_band *sband,
 213                           struct ieee80211_sta *sta, void *priv_sta,
 214                           struct sk_buff *skb)
 215 {
 216         struct rtl_priv *rtlpriv = ppriv;
 217         struct rtl_mac *mac = rtl_mac(rtlpriv);
 218         struct ieee80211_hdr *hdr = rtl_get_hdr(skb);
 219         __le16 fc = rtl_get_fc(skb);
 220         struct rtl_sta_info *sta_entry;
 221
 222         if (!priv_sta || !ieee80211_is_data(fc))
 223                 return;
 224
 225         if (rtl_is_special_data(mac->hw, skb, true, true))
 226                 return;
 227
 228         if (is_multicast_ether_addr(ieee80211_get_DA(hdr)) ||
 229             is_broadcast_ether_addr(ieee80211_get_DA(hdr)))
 230                 return;
 231
 232         if (sta) {
 233                 /* Check if aggregation has to be enabled for this tid */
 234                 sta_entry = (struct rtl_sta_info *)sta->drv_priv;
 235                 if ((sta->ht_cap.ht_supported) &&
 236                     !(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
 237                         if (ieee80211_is_data_qos(fc)) {
 238                                 u8 tid = rtl_get_tid(skb);
 239
 240                                 if (_rtl_tx_aggr_check(rtlpriv, sta_entry,
 241                                                        tid)) {
 242                                         sta_entry->tids[tid].agg.agg_state =
 243                                                 RTL_AGG_PROGRESS;
 244                                         ieee80211_start_tx_ba_session(sta, tid,
 245                                                                       5000);
 246                                 }
 247                         }
 248                 }
 249         }
 250 }
 251
 252 static void rtl_rate_init(void *ppriv,
 253                           struct ieee80211_supported_band *sband,
 254                           struct cfg80211_chan_def *chandef,
 255                           struct ieee80211_sta *sta, void *priv_sta)
 256 {
 257 }
 258
 259 static void rtl_rate_update(void *ppriv,
 260                             struct ieee80211_supported_band *sband,
 261                             struct cfg80211_chan_def *chandef,
 262                             struct ieee80211_sta *sta, void *priv_sta,
 263                             u32 changed)
 264 {
 265 }
 266
 267 static void *rtl_rate_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
 268 {
 269         struct rtl_priv *rtlpriv = rtl_priv(hw);
 270         return rtlpriv;
 271 }
 272
 273 static void rtl_rate_free(void *rtlpriv)
 274 {
 275 }
 276
 277 static void *rtl_rate_alloc_sta(void *ppriv,
 278                                 struct ieee80211_sta *sta, gfp_t gfp)
 279 {
 280         struct rtl_priv *rtlpriv = ppriv;
 281         struct rtl_rate_priv *rate_priv;
 282
 283         rate_priv = kzalloc(sizeof(*rate_priv), gfp);
 284         if (!rate_priv) {
 285                 pr_err("Unable to allocate private rc structure\n");
 286                 return NULL;
 287         }
 288
 289         rtlpriv->rate_priv = rate_priv;
 290
 291         return rate_priv;
 292 }
 293
 294 static void rtl_rate_free_sta(void *rtlpriv,
 295                               struct ieee80211_sta *sta, void *priv_sta)
 296 {
 297         struct rtl_rate_priv *rate_priv = priv_sta;
 298
 299         kfree(rate_priv);
 300 }
 301
 302 static const struct rate_control_ops rtl_rate_ops = {
 303         .name = "rtl_rc",
 304         .alloc = rtl_rate_alloc,
 305         .free = rtl_rate_free,
 306         .alloc_sta = rtl_rate_alloc_sta,
 307         .free_sta = rtl_rate_free_sta,
 308         .rate_init = rtl_rate_init,
 309         .rate_update = rtl_rate_update,
 310         .tx_status = rtl_tx_status,
 311         .get_rate = rtl_get_rate,
 312 };
 313
 314 int rtl_rate_control_register(void)
 315 {
 316         return ieee80211_rate_control_register(&rtl_rate_ops);
 317 }
 318
 319 void rtl_rate_control_unregister(void)
 320 {
 321         ieee80211_rate_control_unregister(&rtl_rate_ops);
 322 }