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 * 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 *CCK11M or OFDM_54M based on wireless mode. 39 */ 40static u8 _rtl_rc_get_highest_rix(struct rtl_priv *rtlpriv, 41 struct ieee80211_sta *sta, 42 struct sk_buff *skb, bool not_data) 43{ 44 struct rtl_mac *rtlmac = rtl_mac(rtlpriv); 45 struct rtl_hal *rtlhal = rtl_hal(rtlpriv); 46 struct rtl_phy *rtlphy = &(rtlpriv->phy); 47 struct rtl_sta_info *sta_entry = NULL; 48 u8 wireless_mode = 0; 49 50 /* 51 *this rate is no use for true rate, firmware 52 *will control rate at all it just used for 53 *1.show in iwconfig in B/G mode 54 *2.in rtl_get_tcb_desc when we check rate is 55 * 1M we will not use FW rate but user rate. 56 */ 57 if (rtlmac->opmode == NL80211_IFTYPE_AP || 58 rtlmac->opmode == NL80211_IFTYPE_ADHOC) { 59 if (sta) { 60 sta_entry = (struct rtl_sta_info *) sta->drv_priv; 61 wireless_mode = sta_entry->wireless_mode; 62 } else { 63 return 0; 64 } 65 } else { 66 wireless_mode = rtlmac->mode; 67 } 68 69 if (rtl_is_special_data(rtlpriv->mac80211.hw, skb, true) || 70 not_data) { 71 return 0; 72 } else { 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 { 79 if (get_rf_type(rtlphy) != RF_2T2R) 80 return N_MODE_MCS7_RIX; 81 else 82 return N_MODE_MCS15_RIX; 83 } 84 } else { 85 if (wireless_mode == WIRELESS_MODE_A) { 86 return A_MODE_MAX_RIX; 87 } else { 88 if (get_rf_type(rtlphy) != RF_2T2R) 89 return N_MODE_MCS7_RIX; 90 else 91 return N_MODE_MCS15_RIX; 92 } 93 } 94 } 95} 96 97static void _rtl_rc_rate_set_series(struct rtl_priv *rtlpriv, 98 struct ieee80211_sta *sta, 99 struct ieee80211_tx_rate *rate, 100 struct ieee80211_tx_rate_control *txrc, 101 u8 tries, char rix, int rtsctsenable, 102 bool not_data) 103{ 104 struct rtl_mac *mac = rtl_mac(rtlpriv); 105 u8 sgi_20 = 0, sgi_40 = 0; 106 107 if (sta) { 108 sgi_20 = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_20; 109 sgi_40 = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_40; 110 } 111 rate->count = tries; 112 rate->idx = rix >= 0x00 ? rix : 0x00; 113 114 if (!not_data) { 115 if (txrc->short_preamble) 116 rate->flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE; 117 if (mac->opmode == NL80211_IFTYPE_AP || 118 mac->opmode == NL80211_IFTYPE_ADHOC) { 119 if (sta && (sta->ht_cap.cap & 120 IEEE80211_HT_CAP_SUP_WIDTH_20_40)) 121 rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 122 } else { 123 if (mac->bw_40) 124 rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 125 } 126 if (sgi_20 || sgi_40) 127 rate->flags |= IEEE80211_TX_RC_SHORT_GI; 128 if (sta && sta->ht_cap.ht_supported) 129 rate->flags |= IEEE80211_TX_RC_MCS; 130 } 131} 132 133static void rtl_get_rate(void *ppriv, struct ieee80211_sta *sta, 134 void *priv_sta, struct ieee80211_tx_rate_control *txrc) 135{ 136 struct rtl_priv *rtlpriv = ppriv; 137 struct sk_buff *skb = txrc->skb; 138 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb); 139 struct ieee80211_tx_rate *rates = tx_info->control.rates; 140 __le16 fc = rtl_get_fc(skb); 141 u8 try_per_rate, i, rix; 142 bool not_data = !ieee80211_is_data(fc); 143 144 if (rate_control_send_low(sta, priv_sta, txrc)) 145 return; 146 147 rix = _rtl_rc_get_highest_rix(rtlpriv, sta, skb, not_data); 148 try_per_rate = 1; 149 _rtl_rc_rate_set_series(rtlpriv, sta, &rates[0], txrc, 150 try_per_rate, rix, 1, not_data); 151 152 if (!not_data) { 153 for (i = 1; i < 4; i++) 154 _rtl_rc_rate_set_series(rtlpriv, sta, &rates[i], 155 txrc, i, (rix - i), 1, 156 not_data); 157 } 158} 159 160static bool _rtl_tx_aggr_check(struct rtl_priv *rtlpriv, 161 struct rtl_sta_info *sta_entry, u16 tid) 162{ 163 struct rtl_mac *mac = rtl_mac(rtlpriv); 164 165 if (mac->act_scanning) 166 return false; 167 168 if (mac->opmode == NL80211_IFTYPE_STATION && 169 mac->cnt_after_linked < 3) 170 return false; 171 172 if (sta_entry->tids[tid].agg.agg_state == RTL_AGG_STOP) 173 return true; 174 175 return false; 176} 177 178/*mac80211 Rate Control callbacks*/ 179static void rtl_tx_status(void *ppriv, 180 struct ieee80211_supported_band *sband, 181 struct ieee80211_sta *sta, void *priv_sta, 182 struct sk_buff *skb) 183{ 184 struct rtl_priv *rtlpriv = ppriv; 185 struct rtl_mac *mac = rtl_mac(rtlpriv); 186 struct ieee80211_hdr *hdr = rtl_get_hdr(skb); 187 __le16 fc = rtl_get_fc(skb); 188 struct rtl_sta_info *sta_entry; 189 190 if (!priv_sta || !ieee80211_is_data(fc)) 191 return; 192 193 if (rtl_is_special_data(mac->hw, skb, true)) 194 return; 195 196 if (is_multicast_ether_addr(ieee80211_get_DA(hdr)) 197 || is_broadcast_ether_addr(ieee80211_get_DA(hdr))) 198 return; 199 200 if (sta) { 201 /* Check if aggregation has to be enabled for this tid */ 202 sta_entry = (struct rtl_sta_info *) sta->drv_priv; 203 if ((sta->ht_cap.ht_supported) && 204 !(skb->protocol == cpu_to_be16(ETH_P_PAE))) { 205 if (ieee80211_is_data_qos(fc)) { 206 u8 tid = rtl_get_tid(skb); 207 if (_rtl_tx_aggr_check(rtlpriv, sta_entry, 208 tid)) { 209 sta_entry->tids[tid].agg.agg_state = 210 RTL_AGG_PROGRESS; 211 ieee80211_start_tx_ba_session(sta, 212 tid, 5000); 213 } 214 } 215 } 216 } 217} 218 219static void rtl_rate_init(void *ppriv, 220 struct ieee80211_supported_band *sband, 221 struct ieee80211_sta *sta, void *priv_sta) 222{ 223} 224 225static void rtl_rate_update(void *ppriv, 226 struct ieee80211_supported_band *sband, 227 struct ieee80211_sta *sta, void *priv_sta, 228 u32 changed, 229 enum nl80211_channel_type oper_chan_type) 230{ 231} 232 233static void *rtl_rate_alloc(struct ieee80211_hw *hw, 234 struct dentry *debugfsdir) 235{ 236 struct rtl_priv *rtlpriv = rtl_priv(hw); 237 return rtlpriv; 238} 239 240static void rtl_rate_free(void *rtlpriv) 241{ 242 return; 243} 244 245static 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(rtlpriv, 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 263static 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 270static struct rate_control_ops rtl_rate_ops = { 271 .module = NULL, 272 .name = "rtl_rc", 273 .alloc = rtl_rate_alloc, 274 .free = rtl_rate_free, 275 .alloc_sta = rtl_rate_alloc_sta, 276 .free_sta = rtl_rate_free_sta, 277 .rate_init = rtl_rate_init, 278 .rate_update = rtl_rate_update, 279 .tx_status = rtl_tx_status, 280 .get_rate = rtl_get_rate, 281}; 282 283int rtl_rate_control_register(void) 284{ 285 return ieee80211_rate_control_register(&rtl_rate_ops); 286} 287 288void rtl_rate_control_unregister(void) 289{ 290 ieee80211_rate_control_unregister(&rtl_rate_ops); 291} 292