drivers/staging/rtl8821ae/rc.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2009-2010  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  *highest rate based on wireless mode used for iwconfig
  39  *show Tx rate.
  40  */
  41 static u8 _rtl_rc_get_highest_rix(struct rtl_priv *rtlpriv,
  42                                   struct ieee80211_sta *sta,
  43                                   struct sk_buff *skb, bool not_data)
  44 {
  45         struct rtl_mac *rtlmac = rtl_mac(rtlpriv);
  46         struct rtl_hal *rtlhal = rtl_hal(rtlpriv);
  47         struct rtl_phy *rtlphy = &(rtlpriv->phy);
  48         struct rtl_sta_info *sta_entry = NULL;
  49         u8 wireless_mode = 0;
  50
  51         /*
  52          *this rate is no use for true rate, firmware
  53          *will control rate at all it just used for
  54          *1.show in iwconfig in B/G mode
  55          *2.in rtl_get_tcb_desc when we check rate is
  56          *      1M we will not use FW rate but user rate.
  57          */
  58         if (rtlmac->opmode == NL80211_IFTYPE_AP ||
  59             rtlmac->opmode == NL80211_IFTYPE_ADHOC ||
  60             rtlmac->opmode == NL80211_IFTYPE_MESH_POINT) {
  61                 if (sta) {
  62                         sta_entry = (struct rtl_sta_info *) sta->drv_priv;
  63                         wireless_mode = sta_entry->wireless_mode;
  64                 } else {
  65                         return 0;
  66                 }
  67         } else {
  68                 wireless_mode = rtlmac->mode;
  69         }
  70
  71         if (rtl_is_special_data(rtlpriv->mac80211.hw, skb, true) || 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,
 136                          struct ieee80211_tx_rate_control *txrc)
 137 {
 138         struct rtl_priv *rtlpriv = ppriv;
 139         struct sk_buff *skb = txrc->skb;
 140         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
 141         struct ieee80211_tx_rate *rates = tx_info->control.rates;
 142         __le16 fc = rtl_get_fc(skb);
 143         u8 try_per_rate, i, rix;
 144         bool not_data = !ieee80211_is_data(fc);
 145
 146         if (rate_control_send_low(sta, priv_sta, txrc))
 147                 return;
 148
 149         rix = _rtl_rc_get_highest_rix(rtlpriv, sta, skb, not_data);
 150         try_per_rate = 1;
 151         _rtl_rc_rate_set_series(rtlpriv, sta, &rates[0], txrc,
 152                                 try_per_rate, rix, 1, not_data);
 153
 154         if (!not_data) {
 155                 for (i = 1; i < 4; i++)
 156                         _rtl_rc_rate_set_series(rtlpriv, sta, &rates[i],
 157                                                 txrc, i, (rix - i), 1,
 158                                                 not_data);
 159         }
 160 }
 161
 162 static bool _rtl_tx_aggr_check(struct rtl_priv *rtlpriv,
 163                                struct rtl_sta_info *sta_entry, u16 tid)
 164 {
 165         struct rtl_mac *mac = rtl_mac(rtlpriv);
 166
 167         if (mac->act_scanning)
 168                 return false;
 169
 170         if (mac->opmode == NL80211_IFTYPE_STATION &&
 171             mac->cnt_after_linked < 3)
 172                 return false;
 173
 174         if (sta_entry->tids[tid].agg.agg_state == RTL_AGG_STOP)
 175                 return true;
 176
 177         return false;
 178 }
 179
 180 /*mac80211 Rate Control callbacks*/
 181 static void rtl_tx_status(void *ppriv,
 182                           struct ieee80211_supported_band *sband,
 183                           struct ieee80211_sta *sta, void *priv_sta,
 184                           struct sk_buff *skb)
 185 {
 186         struct rtl_priv *rtlpriv = ppriv;
 187         struct rtl_mac *mac = rtl_mac(rtlpriv);
 188         struct ieee80211_hdr *hdr = rtl_get_hdr(skb);
 189         __le16 fc = rtl_get_fc(skb);
 190         struct rtl_sta_info *sta_entry;
 191
 192         if (!priv_sta || !ieee80211_is_data(fc))
 193                 return;
 194
 195         if (rtl_is_special_data(mac->hw, skb, true))
 196                 return;
 197
 198         if (is_multicast_ether_addr(ieee80211_get_DA(hdr)) ||
 199             is_broadcast_ether_addr(ieee80211_get_DA(hdr)))
 200                 return;
 201
 202         if (sta) {
 203                 /* Check if aggregation has to be enabled for this tid */
 204                 sta_entry = (struct rtl_sta_info *) sta->drv_priv;
 205                 if ((sta->ht_cap.ht_supported == true) &&
 206                                 !(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
 207                         if (ieee80211_is_data_qos(fc)) {
 208                                 u8 tid = rtl_get_tid(skb);
 209                                 if (_rtl_tx_aggr_check(rtlpriv, sta_entry,
 210                                                        tid)) {
 211                                         sta_entry->tids[tid].agg.agg_state =
 212                                                 RTL_AGG_PROGRESS;
 213                                         ieee80211_start_tx_ba_session(sta, tid,
 214                                                                       5000);
 215                                 }
 216                         }
 217                 }
 218         }
 219 }
 220
 221 static void rtl_rate_init(void *ppriv,
 222                           struct ieee80211_supported_band *sband,
 223                           struct cfg80211_chan_def *chandef,
 224                           struct ieee80211_sta *sta, void *priv_sta)
 225 {
 226 }
 227 static void rtl_rate_update(void *ppriv,
 228                             struct ieee80211_supported_band *sband,
 229                             struct cfg80211_chan_def *chandef,
 230                             struct ieee80211_sta *sta, void *priv_sta,
 231                             u32 changed)
 232 {
 233 }
 234 static void *rtl_rate_alloc(struct ieee80211_hw *hw, 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(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         .name = "rtl_rc_21ae",
 272         .alloc = rtl_rate_alloc,
 273         .free = rtl_rate_free,
 274         .alloc_sta = rtl_rate_alloc_sta,
 275         .free_sta = rtl_rate_free_sta,
 276         .rate_init = rtl_rate_init,
 277         .rate_update = rtl_rate_update,
 278         .tx_status = rtl_tx_status,
 279         .get_rate = rtl_get_rate,
 280 };
 281
 282 int rtl_rate_control_register(void)
 283 {
 284         return ieee80211_rate_control_register(&rtl_rate_ops);
 285 }
 286
 287 void rtl_rate_control_unregister(void)
 288 {
 289         ieee80211_rate_control_unregister(&rtl_rate_ops);
 290 }