1 /******************************************************************************
3 * Copyright(c) 2009-2012 Realtek Corporation.
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.
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
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
18 * The full GNU General Public License is included in this distribution in the
19 * file called LICENSE.
21 * Contact Information:
22 * wlanfae <wlanfae@realtek.com>
23 * Realtek Corporation, No. 2, Innovation Road II, Hsinchu Science Park,
24 * Hsinchu 300, Taiwan.
26 * Larry Finger <Larry.Finger@lwfinger.net>
28 *****************************************************************************/
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.
40 static u8 _rtl_rc_get_highest_rix(struct rtl_priv *rtlpriv,
41 struct ieee80211_sta *sta,
42 struct sk_buff *skb, bool not_data)
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;
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.
57 if (rtlmac->opmode == NL80211_IFTYPE_AP ||
58 rtlmac->opmode == NL80211_IFTYPE_ADHOC ||
59 rtlmac->opmode == NL80211_IFTYPE_MESH_POINT) {
61 sta_entry = (struct rtl_sta_info *) sta->drv_priv;
62 wireless_mode = sta_entry->wireless_mode;
67 wireless_mode = rtlmac->mode;
70 if (rtl_is_special_data(rtlpriv->mac80211.hw, skb, true) ||
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;
80 if (get_rf_type(rtlphy) != RF_2T2R)
81 return N_MODE_MCS7_RIX;
83 return N_MODE_MCS15_RIX;
86 if (wireless_mode == WIRELESS_MODE_A) {
87 return A_MODE_MAX_RIX;
89 if (get_rf_type(rtlphy) != RF_2T2R)
90 return N_MODE_MCS7_RIX;
92 return N_MODE_MCS15_RIX;
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,
105 struct rtl_mac *mac = rtl_mac(rtlpriv);
106 u8 sgi_20 = 0, sgi_40 = 0;
109 sgi_20 = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_20;
110 sgi_40 = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_40;
113 rate->idx = rix >= 0x00 ? rix : 0x00;
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;
125 rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
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;
134 static void rtl_get_rate(void *ppriv, struct ieee80211_sta *sta,
135 void *priv_sta, struct ieee80211_tx_rate_control *txrc)
137 struct rtl_priv *rtlpriv = ppriv;
138 struct sk_buff *skb = txrc->skb;
139 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
140 struct ieee80211_tx_rate *rates = tx_info->control.rates;
141 __le16 fc = rtl_get_fc(skb);
142 u8 try_per_rate, i, rix;
143 bool not_data = !ieee80211_is_data(fc);
145 if (rate_control_send_low(sta, priv_sta, txrc))
148 rix = _rtl_rc_get_highest_rix(rtlpriv, sta, skb, not_data);
150 _rtl_rc_rate_set_series(rtlpriv, sta, &rates[0], txrc,
151 try_per_rate, rix, 1, not_data);
154 for (i = 1; i < 4; i++)
155 _rtl_rc_rate_set_series(rtlpriv, sta, &rates[i],
156 txrc, i, (rix - i), 1,
161 static bool _rtl_tx_aggr_check(struct rtl_priv *rtlpriv,
162 struct rtl_sta_info *sta_entry, u16 tid)
164 struct rtl_mac *mac = rtl_mac(rtlpriv);
166 if (mac->act_scanning)
169 if (mac->opmode == NL80211_IFTYPE_STATION &&
170 mac->cnt_after_linked < 3)
173 if (sta_entry->tids[tid].agg.agg_state == RTL_AGG_STOP)
179 /*mac80211 Rate Control callbacks*/
180 static void rtl_tx_status(void *ppriv,
181 struct ieee80211_supported_band *sband,
182 struct ieee80211_sta *sta, void *priv_sta,
185 struct rtl_priv *rtlpriv = ppriv;
186 struct rtl_mac *mac = rtl_mac(rtlpriv);
187 struct ieee80211_hdr *hdr = rtl_get_hdr(skb);
188 __le16 fc = rtl_get_fc(skb);
189 struct rtl_sta_info *sta_entry;
191 if (!priv_sta || !ieee80211_is_data(fc))
194 if (rtl_is_special_data(mac->hw, skb, true))
197 if (is_multicast_ether_addr(ieee80211_get_DA(hdr))
198 || is_broadcast_ether_addr(ieee80211_get_DA(hdr)))
202 /* Check if aggregation has to be enabled for this tid */
203 sta_entry = (struct rtl_sta_info *) sta->drv_priv;
204 if ((sta->ht_cap.ht_supported) &&
205 !(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
206 if (ieee80211_is_data_qos(fc)) {
207 u8 tid = rtl_get_tid(skb);
208 if (_rtl_tx_aggr_check(rtlpriv, sta_entry,
210 sta_entry->tids[tid].agg.agg_state =
212 ieee80211_start_tx_ba_session(sta,
220 static void rtl_rate_init(void *ppriv,
221 struct ieee80211_supported_band *sband,
222 struct ieee80211_sta *sta, void *priv_sta)
226 static void rtl_rate_update(void *ppriv,
227 struct ieee80211_supported_band *sband,
228 struct ieee80211_sta *sta, void *priv_sta,
233 static void *rtl_rate_alloc(struct ieee80211_hw *hw,
234 struct dentry *debugfsdir)
236 struct rtl_priv *rtlpriv = rtl_priv(hw);
240 static void rtl_rate_free(void *rtlpriv)
245 static void *rtl_rate_alloc_sta(void *ppriv,
246 struct ieee80211_sta *sta, gfp_t gfp)
248 struct rtl_priv *rtlpriv = ppriv;
249 struct rtl_rate_priv *rate_priv;
251 rate_priv = kzalloc(sizeof(struct rtl_rate_priv), gfp);
253 RT_TRACE(rtlpriv, COMP_ERR, DBG_EMERG,
254 "Unable to allocate private rc structure\n");
258 rtlpriv->rate_priv = rate_priv;
263 static void rtl_rate_free_sta(void *rtlpriv,
264 struct ieee80211_sta *sta, void *priv_sta)
266 struct rtl_rate_priv *rate_priv = priv_sta;
270 static struct rate_control_ops rtl_rate_ops = {
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,
283 int rtl_rate_control_register(void)
285 return ieee80211_rate_control_register(&rtl_rate_ops);
288 void rtl_rate_control_unregister(void)
290 ieee80211_rate_control_unregister(&rtl_rate_ops);