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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 *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}