1 /******************************************************************************
3 * Copyright(c) 2009-2010 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 sk_buff *skb, bool not_data)
43 struct rtl_mac *rtlmac = rtl_mac(rtlpriv);
46 *mgt use 1M, although we have check it
47 *before this function use rate_control_send_low,
48 *we still check it here
51 return rtlpriv->cfg->maps[RTL_RC_CCK_RATE1M];
54 *this rate is no use for true rate, firmware
55 *will control rate at all it just used for
56 *1.show in iwconfig in B/G mode
57 *2.in rtl_get_tcb_desc when we check rate is
58 * 1M we will not use FW rate but user rate.
60 if (rtl_is_special_data(rtlpriv->mac80211.hw, skb, true)) {
61 return rtlpriv->cfg->maps[RTL_RC_CCK_RATE1M];
63 if (rtlmac->mode == WIRELESS_MODE_B)
64 return rtlpriv->cfg->maps[RTL_RC_CCK_RATE11M];
66 return rtlpriv->cfg->maps[RTL_RC_OFDM_RATE54M];
70 static void _rtl_rc_rate_set_series(struct rtl_priv *rtlpriv,
71 struct ieee80211_tx_rate *rate,
72 struct ieee80211_tx_rate_control *txrc,
73 u8 tries, u8 rix, int rtsctsenable,
76 struct rtl_mac *mac = rtl_mac(rtlpriv);
79 rate->idx = (rix > 0x2) ? rix : 0x2;
82 if (txrc->short_preamble)
83 rate->flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
85 rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
86 if (mac->sgi_20 || mac->sgi_40)
87 rate->flags |= IEEE80211_TX_RC_SHORT_GI;
89 rate->flags |= IEEE80211_TX_RC_MCS;
93 static void rtl_get_rate(void *ppriv, struct ieee80211_sta *sta,
94 void *priv_sta, struct ieee80211_tx_rate_control *txrc)
96 struct rtl_priv *rtlpriv = ppriv;
97 struct sk_buff *skb = txrc->skb;
98 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
99 struct ieee80211_tx_rate *rates = tx_info->control.rates;
100 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
101 __le16 fc = hdr->frame_control;
102 u8 try_per_rate, i, rix;
103 bool not_data = !ieee80211_is_data(fc);
105 if (rate_control_send_low(sta, priv_sta, txrc))
108 rix = _rtl_rc_get_highest_rix(rtlpriv, skb, not_data);
111 _rtl_rc_rate_set_series(rtlpriv, &rates[0], txrc,
112 try_per_rate, rix, 1, not_data);
115 for (i = 1; i < 4; i++)
116 _rtl_rc_rate_set_series(rtlpriv, &rates[i],
117 txrc, i, (rix - i), 1,
122 static bool _rtl_tx_aggr_check(struct rtl_priv *rtlpriv, u16 tid)
124 struct rtl_mac *mac = rtl_mac(rtlpriv);
126 if (mac->act_scanning)
129 if (mac->cnt_after_linked < 3)
132 if (mac->tids[tid].agg.agg_state == RTL_AGG_OFF)
138 /*mac80211 Rate Control callbacks*/
139 static void rtl_tx_status(void *ppriv,
140 struct ieee80211_supported_band *sband,
141 struct ieee80211_sta *sta, void *priv_sta,
144 struct rtl_priv *rtlpriv = ppriv;
145 struct rtl_mac *mac = rtl_mac(rtlpriv);
146 struct ieee80211_hdr *hdr;
149 hdr = (struct ieee80211_hdr *)skb->data;
150 fc = hdr->frame_control;
152 if (!priv_sta || !ieee80211_is_data(fc))
155 if (rtl_is_special_data(mac->hw, skb, true))
158 if (is_multicast_ether_addr(ieee80211_get_DA(hdr))
159 || is_broadcast_ether_addr(ieee80211_get_DA(hdr)))
162 /* Check if aggregation has to be enabled for this tid */
163 if (conf_is_ht(&mac->hw->conf) &&
164 !(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
165 if (ieee80211_is_data_qos(fc)) {
168 qc = ieee80211_get_qos_ctl(hdr);
171 if (_rtl_tx_aggr_check(rtlpriv, tid))
172 ieee80211_start_tx_ba_session(sta, tid, 5000);
177 static void rtl_rate_init(void *ppriv,
178 struct ieee80211_supported_band *sband,
179 struct ieee80211_sta *sta, void *priv_sta)
181 struct rtl_priv *rtlpriv = ppriv;
182 struct rtl_mac *mac = rtl_mac(rtlpriv);
183 u8 is_ht = conf_is_ht(&mac->hw->conf);
185 if ((mac->opmode == NL80211_IFTYPE_STATION) ||
186 (mac->opmode == NL80211_IFTYPE_MESH_POINT) ||
187 (mac->opmode == NL80211_IFTYPE_ADHOC)) {
189 switch (sband->band) {
190 case IEEE80211_BAND_2GHZ:
191 rtlpriv->rate_priv->cur_ratetab_idx =
194 rtlpriv->rate_priv->cur_ratetab_idx =
195 RATR_INX_WIRELESS_NGB;
197 case IEEE80211_BAND_5GHZ:
198 rtlpriv->rate_priv->cur_ratetab_idx =
201 rtlpriv->rate_priv->cur_ratetab_idx =
202 RATR_INX_WIRELESS_NGB;
205 RT_TRACE(rtlpriv, COMP_ERR, DBG_WARNING,
207 rtlpriv->rate_priv->cur_ratetab_idx =
208 RATR_INX_WIRELESS_NGB;
212 RT_TRACE(rtlpriv, COMP_RATE, DBG_DMESG,
213 ("Choosing rate table index: %d\n",
214 rtlpriv->rate_priv->cur_ratetab_idx));
220 static void rtl_rate_update(void *ppriv,
221 struct ieee80211_supported_band *sband,
222 struct ieee80211_sta *sta, void *priv_sta,
224 enum nl80211_channel_type oper_chan_type)
226 struct rtl_priv *rtlpriv = ppriv;
227 struct rtl_mac *mac = rtl_mac(rtlpriv);
228 struct rtl_hal *rtlhal = rtl_hal(rtlpriv);
229 bool oper_cw40 = false, oper_sgi40;
230 bool local_cw40 = mac->bw_40;
231 bool local_sgi40 = mac->sgi_40;
232 u8 is_ht = conf_is_ht(&mac->hw->conf);
234 if (changed & IEEE80211_RC_HT_CHANGED) {
235 if (mac->opmode != NL80211_IFTYPE_STATION)
238 if (rtlhal->hw->conf.channel_type == NL80211_CHAN_HT40MINUS ||
239 rtlhal->hw->conf.channel_type == NL80211_CHAN_HT40PLUS)
242 oper_sgi40 = mac->sgi_40;
244 if ((local_cw40 != oper_cw40) || (local_sgi40 != oper_sgi40)) {
245 switch (sband->band) {
246 case IEEE80211_BAND_2GHZ:
247 rtlpriv->rate_priv->cur_ratetab_idx =
250 rtlpriv->rate_priv->cur_ratetab_idx =
251 RATR_INX_WIRELESS_NGB;
253 case IEEE80211_BAND_5GHZ:
254 rtlpriv->rate_priv->cur_ratetab_idx =
257 rtlpriv->rate_priv->cur_ratetab_idx =
258 RATR_INX_WIRELESS_NGB;
261 RT_TRACE(rtlpriv, COMP_ERR, DBG_EMERG,
263 rtlpriv->rate_priv->cur_ratetab_idx =
264 RATR_INX_WIRELESS_NGB;
271 static void *rtl_rate_alloc(struct ieee80211_hw *hw,
272 struct dentry *debugfsdir)
274 struct rtl_priv *rtlpriv = rtl_priv(hw);
278 static void rtl_rate_free(void *rtlpriv)
283 static void *rtl_rate_alloc_sta(void *ppriv,
284 struct ieee80211_sta *sta, gfp_t gfp)
286 struct rtl_priv *rtlpriv = ppriv;
287 struct rtl_rate_priv *rate_priv;
289 rate_priv = kzalloc(sizeof(struct rtl_rate_priv), gfp);
291 RT_TRACE(rtlpriv, COMP_ERR, DBG_EMERG,
292 ("Unable to allocate private rc structure\n"));
296 rtlpriv->rate_priv = rate_priv;
301 static void rtl_rate_free_sta(void *rtlpriv,
302 struct ieee80211_sta *sta, void *priv_sta)
304 struct rtl_rate_priv *rate_priv = priv_sta;
308 static struct rate_control_ops rtl_rate_ops = {
311 .alloc = rtl_rate_alloc,
312 .free = rtl_rate_free,
313 .alloc_sta = rtl_rate_alloc_sta,
314 .free_sta = rtl_rate_free_sta,
315 .rate_init = rtl_rate_init,
316 .rate_update = rtl_rate_update,
317 .tx_status = rtl_tx_status,
318 .get_rate = rtl_get_rate,
321 int rtl_rate_control_register(void)
323 return ieee80211_rate_control_register(&rtl_rate_ops);
326 void rtl_rate_control_unregister(void)
328 ieee80211_rate_control_unregister(&rtl_rate_ops);