drivers/net/wireless/realtek/rtlwifi/rc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright(c) 2009-2012  Realtek Corporation.*/
   3
   4 #include "wifi.h"
   5 #include "base.h"
   6 #include "rc.h"
   7
   8 /*
   9  *Finds the highest rate index we can use
  10  *if skb is special data like DHCP/EAPOL, we set should
  11  *it to lowest rate CCK_1M, otherwise we set rate to
  12  *highest rate based on wireless mode used for iwconfig
  13  *show Tx rate.
  14  */
  15 static u8 _rtl_rc_get_highest_rix(struct rtl_priv *rtlpriv,
  16                                   struct ieee80211_sta *sta,
  17                                   struct sk_buff *skb, bool not_data)
  18 {
  19         struct rtl_hal *rtlhal = rtl_hal(rtlpriv);
  20         struct rtl_phy *rtlphy = &(rtlpriv->phy);
  21         struct rtl_sta_info *sta_entry = NULL;
  22         u16 wireless_mode = 0;
  23         u8 nss;
  24         struct ieee80211_tx_rate rate;
  25
  26         switch (get_rf_type(rtlphy)) {
  27         case RF_4T4R:
  28                 nss = 4;
  29                 break;
  30         case RF_3T3R:
  31                 nss = 3;
  32                 break;
  33         case RF_2T2R:
  34                 nss = 2;
  35                 break;
  36         default:
  37                 nss = 1;
  38                 break;
  39         }
  40
  41         /*
  42          *this rate is no use for true rate, firmware
  43          *will control rate at all it just used for
  44          *1.show in iwconfig in B/G mode
  45          *2.in rtl_get_tcb_desc when we check rate is
  46          *      1M we will not use FW rate but user rate.
  47          */
  48
  49         if (sta) {
  50                 sta_entry = (struct rtl_sta_info *)sta->drv_priv;
  51                 wireless_mode = sta_entry->wireless_mode;
  52         }
  53
  54         if (rtl_is_special_data(rtlpriv->mac80211.hw, skb, true, false) ||
  55             not_data) {
  56                 return 0;
  57         } else {
  58                 if (rtlhal->current_bandtype == BAND_ON_2_4G) {
  59                         if (wireless_mode == WIRELESS_MODE_B) {
  60                                 return B_MODE_MAX_RIX;
  61                         } else if (wireless_mode == WIRELESS_MODE_G) {
  62                                 return G_MODE_MAX_RIX;
  63                         } else if (wireless_mode == WIRELESS_MODE_N_24G) {
  64                                 if (nss == 1)
  65                                         return N_MODE_MCS7_RIX;
  66                                 else
  67                                         return N_MODE_MCS15_RIX;
  68                         } else if (wireless_mode == WIRELESS_MODE_AC_24G) {
  69                                 if (sta->bandwidth == IEEE80211_STA_RX_BW_20) {
  70                                         ieee80211_rate_set_vht(&rate,
  71                                                                AC_MODE_MCS8_RIX,
  72                                                                nss);
  73                                         goto out;
  74                                 } else {
  75                                         ieee80211_rate_set_vht(&rate,
  76                                                                AC_MODE_MCS9_RIX,
  77                                                                nss);
  78                                         goto out;
  79                                 }
  80                         }
  81                         return 0;
  82                 } else {
  83                         if (wireless_mode == WIRELESS_MODE_A) {
  84                                 return A_MODE_MAX_RIX;
  85                         } else if (wireless_mode == WIRELESS_MODE_N_5G) {
  86                                 if (nss == 1)
  87                                         return N_MODE_MCS7_RIX;
  88                                 else
  89                                         return N_MODE_MCS15_RIX;
  90                         } else if (wireless_mode == WIRELESS_MODE_AC_5G) {
  91                                 if (sta->bandwidth == IEEE80211_STA_RX_BW_20) {
  92                                         ieee80211_rate_set_vht(&rate,
  93                                                                AC_MODE_MCS8_RIX,
  94                                                                nss);
  95                                         goto out;
  96                                 } else {
  97                                         ieee80211_rate_set_vht(&rate,
  98                                                                AC_MODE_MCS9_RIX,
  99                                                                nss);
 100                                         goto out;
 101                                 }
 102                         }
 103                         return 0;
 104                 }
 105         }
 106
 107 out:
 108         return rate.idx;
 109 }
 110
 111 static void _rtl_rc_rate_set_series(struct rtl_priv *rtlpriv,
 112                                     struct ieee80211_sta *sta,
 113                                     struct ieee80211_tx_rate *rate,
 114                                     struct ieee80211_tx_rate_control *txrc,
 115                                     u8 tries, s8 rix, int rtsctsenable,
 116                                     bool not_data)
 117 {
 118         struct rtl_mac *mac = rtl_mac(rtlpriv);
 119         struct rtl_sta_info *sta_entry = NULL;
 120         u16 wireless_mode = 0;
 121         u8 sgi_20 = 0, sgi_40 = 0, sgi_80 = 0;
 122
 123         if (sta) {
 124                 sgi_20 = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_20;
 125                 sgi_40 = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_40;
 126                 sgi_80 = sta->vht_cap.cap & IEEE80211_VHT_CAP_SHORT_GI_80;
 127                 sta_entry = (struct rtl_sta_info *)sta->drv_priv;
 128                 wireless_mode = sta_entry->wireless_mode;
 129         }
 130         rate->count = tries;
 131         rate->idx = rix >= 0x00 ? rix : 0x00;
 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         rix = _rtl_rc_get_highest_rix(rtlpriv, sta, skb, not_data);
 177         try_per_rate = 1;
 178         _rtl_rc_rate_set_series(rtlpriv, sta, &rates[0], txrc,
 179                                 try_per_rate, rix, 1, not_data);
 180
 181         if (!not_data) {
 182                 for (i = 1; i < 4; i++)
 183                         _rtl_rc_rate_set_series(rtlpriv, sta, &rates[i],
 184                                                 txrc, i, (rix - i), 1,
 185                                                 not_data);
 186         }
 187 }
 188
 189 static bool _rtl_tx_aggr_check(struct rtl_priv *rtlpriv,
 190                                struct rtl_sta_info *sta_entry, u16 tid)
 191 {
 192         struct rtl_mac *mac = rtl_mac(rtlpriv);
 193
 194         if (mac->act_scanning)
 195                 return false;
 196
 197         if (mac->opmode == NL80211_IFTYPE_STATION &&
 198             mac->cnt_after_linked < 3)
 199                 return false;
 200
 201         if (sta_entry->tids[tid].agg.agg_state == RTL_AGG_STOP)
 202                 return true;
 203
 204         return false;
 205 }
 206
 207 /*mac80211 Rate Control callbacks*/
 208 static void rtl_tx_status(void *ppriv,
 209                           struct ieee80211_supported_band *sband,
 210                           struct ieee80211_sta *sta, void *priv_sta,
 211                           struct sk_buff *skb)
 212 {
 213         struct rtl_priv *rtlpriv = ppriv;
 214         struct rtl_mac *mac = rtl_mac(rtlpriv);
 215         struct ieee80211_hdr *hdr = rtl_get_hdr(skb);
 216         __le16 fc = rtl_get_fc(skb);
 217         struct rtl_sta_info *sta_entry;
 218
 219         if (!priv_sta || !ieee80211_is_data(fc))
 220                 return;
 221
 222         if (rtl_is_special_data(mac->hw, skb, true, true))
 223                 return;
 224
 225         if (is_multicast_ether_addr(ieee80211_get_DA(hdr)) ||
 226             is_broadcast_ether_addr(ieee80211_get_DA(hdr)))
 227                 return;
 228
 229         if (sta) {
 230                 /* Check if aggregation has to be enabled for this tid */
 231                 sta_entry = (struct rtl_sta_info *)sta->drv_priv;
 232                 if (sta->ht_cap.ht_supported &&
 233                     !(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
 234                         if (ieee80211_is_data_qos(fc)) {
 235                                 u8 tid = rtl_get_tid(skb);
 236
 237                                 if (_rtl_tx_aggr_check(rtlpriv, sta_entry,
 238                                                        tid)) {
 239                                         sta_entry->tids[tid].agg.agg_state =
 240                                                 RTL_AGG_PROGRESS;
 241                                         ieee80211_start_tx_ba_session(sta, tid,
 242                                                                       5000);
 243                                 }
 244                         }
 245                 }
 246         }
 247 }
 248
 249 static void rtl_rate_init(void *ppriv,
 250                           struct ieee80211_supported_band *sband,
 251                           struct cfg80211_chan_def *chandef,
 252                           struct ieee80211_sta *sta, void *priv_sta)
 253 {
 254 }
 255
 256 static void rtl_rate_update(void *ppriv,
 257                             struct ieee80211_supported_band *sband,
 258                             struct cfg80211_chan_def *chandef,
 259                             struct ieee80211_sta *sta, void *priv_sta,
 260                             u32 changed)
 261 {
 262 }
 263
 264 static void *rtl_rate_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
 265 {
 266         struct rtl_priv *rtlpriv = rtl_priv(hw);
 267         return rtlpriv;
 268 }
 269
 270 static void rtl_rate_free(void *rtlpriv)
 271 {
 272         return;
 273 }
 274
 275 static void *rtl_rate_alloc_sta(void *ppriv,
 276                                 struct ieee80211_sta *sta, gfp_t gfp)
 277 {
 278         struct rtl_priv *rtlpriv = ppriv;
 279         struct rtl_rate_priv *rate_priv;
 280
 281         rate_priv = kzalloc(sizeof(*rate_priv), gfp);
 282         if (!rate_priv)
 283                 return NULL;
 284
 285         rtlpriv->rate_priv = rate_priv;
 286
 287         return rate_priv;
 288 }
 289
 290 static void rtl_rate_free_sta(void *rtlpriv,
 291                               struct ieee80211_sta *sta, void *priv_sta)
 292 {
 293         struct rtl_rate_priv *rate_priv = priv_sta;
 294
 295         kfree(rate_priv);
 296 }
 297
 298 static const struct rate_control_ops rtl_rate_ops = {
 299         .name = "rtl_rc",
 300         .alloc = rtl_rate_alloc,
 301         .free = rtl_rate_free,
 302         .alloc_sta = rtl_rate_alloc_sta,
 303         .free_sta = rtl_rate_free_sta,
 304         .rate_init = rtl_rate_init,
 305         .rate_update = rtl_rate_update,
 306         .tx_status = rtl_tx_status,
 307         .get_rate = rtl_get_rate,
 308 };
 309
 310 int rtl_rate_control_register(void)
 311 {
 312         return ieee80211_rate_control_register(&rtl_rate_ops);
 313 }
 314
 315 void rtl_rate_control_unregister(void)
 316 {
 317         ieee80211_rate_control_unregister(&rtl_rate_ops);
 318 }