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                 if (sta && sta->vht_cap.vht_supported &&
 142                     (wireless_mode == WIRELESS_MODE_AC_5G ||
 143                      wireless_mode == WIRELESS_MODE_AC_24G ||
 144                      wireless_mode == WIRELESS_MODE_AC_ONLY))
 145                         rate->flags |= IEEE80211_TX_RC_VHT_MCS;
 146         }
 147 }
 148
 149 static void rtl_get_rate(void *ppriv, struct ieee80211_sta *sta,
 150                          void *priv_sta,
 151                          struct ieee80211_tx_rate_control *txrc)
 152 {
 153         struct rtl_priv *rtlpriv = ppriv;
 154         struct sk_buff *skb = txrc->skb;
 155         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
 156         struct ieee80211_tx_rate *rates = tx_info->control.rates;
 157         __le16 fc = rtl_get_fc(skb);
 158         u8 try_per_rate, i, rix;
 159         bool not_data = !ieee80211_is_data(fc);
 160
 161         if (rate_control_send_low(sta, priv_sta, txrc))
 162                 return;
 163
 164         rix = _rtl_rc_get_highest_rix(rtlpriv, sta, skb, not_data);
 165         try_per_rate = 1;
 166         _rtl_rc_rate_set_series(rtlpriv, sta, &rates[0], txrc,
 167                                 try_per_rate, rix, 1, not_data);
 168
 169         if (!not_data) {
 170                 for (i = 1; i < 4; i++)
 171                         _rtl_rc_rate_set_series(rtlpriv, sta, &rates[i],
 172                                                 txrc, i, (rix - i), 1,
 173                                                 not_data);
 174         }
 175 }
 176
 177 static bool _rtl_tx_aggr_check(struct rtl_priv *rtlpriv,
 178                                struct rtl_sta_info *sta_entry, u16 tid)
 179 {
 180         struct rtl_mac *mac = rtl_mac(rtlpriv);
 181
 182         if (mac->act_scanning)
 183                 return false;
 184
 185         if (mac->opmode == NL80211_IFTYPE_STATION &&
 186             mac->cnt_after_linked < 3)
 187                 return false;
 188
 189         if (sta_entry->tids[tid].agg.agg_state == RTL_AGG_STOP)
 190                 return true;
 191
 192         return false;
 193 }
 194
 195 /*mac80211 Rate Control callbacks*/
 196 static void rtl_tx_status(void *ppriv,
 197                           struct ieee80211_supported_band *sband,
 198                           struct ieee80211_sta *sta, void *priv_sta,
 199                           struct sk_buff *skb)
 200 {
 201         struct rtl_priv *rtlpriv = ppriv;
 202         struct rtl_mac *mac = rtl_mac(rtlpriv);
 203         struct ieee80211_hdr *hdr = rtl_get_hdr(skb);
 204         __le16 fc = rtl_get_fc(skb);
 205         struct rtl_sta_info *sta_entry;
 206
 207         if (!priv_sta || !ieee80211_is_data(fc))
 208                 return;
 209
 210         if (rtl_is_special_data(mac->hw, skb, true, true))
 211                 return;
 212
 213         if (is_multicast_ether_addr(ieee80211_get_DA(hdr)) ||
 214             is_broadcast_ether_addr(ieee80211_get_DA(hdr)))
 215                 return;
 216
 217         if (sta) {
 218                 /* Check if aggregation has to be enabled for this tid */
 219                 sta_entry = (struct rtl_sta_info *) sta->drv_priv;
 220                 if ((sta->ht_cap.ht_supported) &&
 221                     !(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
 222                         if (ieee80211_is_data_qos(fc)) {
 223                                 u8 tid = rtl_get_tid(skb);
 224                                 if (_rtl_tx_aggr_check(rtlpriv, sta_entry,
 225                                                        tid)) {
 226                                         sta_entry->tids[tid].agg.agg_state =
 227                                                 RTL_AGG_PROGRESS;
 228                                         ieee80211_start_tx_ba_session(sta, tid,
 229                                                                       5000);
 230                                 }
 231                         }
 232                 }
 233         }
 234 }
 235
 236 static void rtl_rate_init(void *ppriv,
 237                           struct ieee80211_supported_band *sband,
 238                           struct cfg80211_chan_def *chandef,
 239                           struct ieee80211_sta *sta, void *priv_sta)
 240 {
 241 }
 242
 243 static void rtl_rate_update(void *ppriv,
 244                             struct ieee80211_supported_band *sband,
 245                             struct cfg80211_chan_def *chandef,
 246                             struct ieee80211_sta *sta, void *priv_sta,
 247                             u32 changed)
 248 {
 249 }
 250
 251 static void *rtl_rate_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
 252 {
 253         struct rtl_priv *rtlpriv = rtl_priv(hw);
 254         return rtlpriv;
 255 }
 256
 257 static void rtl_rate_free(void *rtlpriv)
 258 {
 259         return;
 260 }
 261
 262 static void *rtl_rate_alloc_sta(void *ppriv,
 263                                 struct ieee80211_sta *sta, gfp_t gfp)
 264 {
 265         struct rtl_priv *rtlpriv = ppriv;
 266         struct rtl_rate_priv *rate_priv;
 267
 268         rate_priv = kzalloc(sizeof(struct rtl_rate_priv), gfp);
 269         if (!rate_priv) {
 270                 RT_TRACE(rtlpriv, COMP_ERR, DBG_EMERG,
 271                          "Unable to allocate private rc structure\n");
 272                 return NULL;
 273         }
 274
 275         rtlpriv->rate_priv = rate_priv;
 276
 277         return rate_priv;
 278 }
 279
 280 static void rtl_rate_free_sta(void *rtlpriv,
 281                               struct ieee80211_sta *sta, void *priv_sta)
 282 {
 283         struct rtl_rate_priv *rate_priv = priv_sta;
 284         kfree(rate_priv);
 285 }
 286
 287 static struct rate_control_ops rtl_rate_ops = {
 288         .name = "rtl_rc",
 289         .alloc = rtl_rate_alloc,
 290         .free = rtl_rate_free,
 291         .alloc_sta = rtl_rate_alloc_sta,
 292         .free_sta = rtl_rate_free_sta,
 293         .rate_init = rtl_rate_init,
 294         .rate_update = rtl_rate_update,
 295         .tx_status = rtl_tx_status,
 296         .get_rate = rtl_get_rate,
 297 };
 298
 299 int rtl_rate_control_register(void)
 300 {
 301         return ieee80211_rate_control_register(&rtl_rate_ops);
 302 }
 303
 304 void rtl_rate_control_unregister(void)
 305 {
 306         ieee80211_rate_control_unregister(&rtl_rate_ops);
 307 }