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 * The full GNU General Public License is included in this distribution in the
15 * file called LICENSE.
16 *
17 * Contact Information:
18 * wlanfae <wlanfae@realtek.com>
19 * Realtek Corporation, No. 2, Innovation Road II, Hsinchu Science Park,
20 * Hsinchu 300, Taiwan.
21 *
22 * Larry Finger <Larry.Finger@lwfinger.net>
23 *
24 *****************************************************************************/
25
26 #include "wifi.h"
27 #include "base.h"
28 #include "rc.h"
29
30 /*
31 *Finds the highest rate index we can use
32 *if skb is special data like DHCP/EAPOL, we set should
33 *it to lowest rate CCK_1M, otherwise we set rate to
34 *highest rate based on wireless mode used for iwconfig
35 *show Tx rate.
36 */
_rtl_rc_get_highest_rix(struct rtl_priv * rtlpriv,struct ieee80211_sta * sta,struct sk_buff * skb,bool not_data)37 static u8 _rtl_rc_get_highest_rix(struct rtl_priv *rtlpriv,
38 struct ieee80211_sta *sta,
39 struct sk_buff *skb, bool not_data)
40 {
41 struct rtl_hal *rtlhal = rtl_hal(rtlpriv);
42 struct rtl_phy *rtlphy = &(rtlpriv->phy);
43 struct rtl_sta_info *sta_entry = NULL;
44 u8 wireless_mode = 0;
45
46 /*
47 *this rate is no use for true rate, firmware
48 *will control rate at all it just used for
49 *1.show in iwconfig in B/G mode
50 *2.in rtl_get_tcb_desc when we check rate is
51 * 1M we will not use FW rate but user rate.
52 */
53
54 if (sta) {
55 sta_entry = (struct rtl_sta_info *)sta->drv_priv;
56 wireless_mode = sta_entry->wireless_mode;
57 }
58
59 if (rtl_is_special_data(rtlpriv->mac80211.hw, skb, true) || not_data) {
60 return 0;
61 } else {
62 if (rtlhal->current_bandtype == BAND_ON_2_4G) {
63 if (wireless_mode == WIRELESS_MODE_B) {
64 return B_MODE_MAX_RIX;
65 } else if (wireless_mode == WIRELESS_MODE_G) {
66 return G_MODE_MAX_RIX;
67 } else if (wireless_mode == WIRELESS_MODE_N_24G) {
68 if (get_rf_type(rtlphy) != RF_2T2R)
69 return N_MODE_MCS7_RIX;
70 else
71 return N_MODE_MCS15_RIX;
72 } else if (wireless_mode == WIRELESS_MODE_AC_24G) {
73 return AC_MODE_MCS9_RIX;
74 }
75 return 0;
76 } else {
77 if (wireless_mode == WIRELESS_MODE_A) {
78 return A_MODE_MAX_RIX;
79 } else if (wireless_mode == WIRELESS_MODE_N_5G) {
80 if (get_rf_type(rtlphy) != RF_2T2R)
81 return N_MODE_MCS7_RIX;
82 else
83 return N_MODE_MCS15_RIX;
84 } else if (wireless_mode == WIRELESS_MODE_AC_5G) {
85 return AC_MODE_MCS9_RIX;
86 }
87 return 0;
88 }
89 }
90 }
91
_rtl_rc_rate_set_series(struct rtl_priv * rtlpriv,struct ieee80211_sta * sta,struct ieee80211_tx_rate * rate,struct ieee80211_tx_rate_control * txrc,u8 tries,char rix,int rtsctsenable,bool not_data)92 static void _rtl_rc_rate_set_series(struct rtl_priv *rtlpriv,
93 struct ieee80211_sta *sta,
94 struct ieee80211_tx_rate *rate,
95 struct ieee80211_tx_rate_control *txrc,
96 u8 tries, char rix, int rtsctsenable,
97 bool not_data)
98 {
99 struct rtl_mac *mac = rtl_mac(rtlpriv);
100 struct rtl_sta_info *sta_entry = NULL;
101 u8 wireless_mode = 0;
102 u8 sgi_20 = 0, sgi_40 = 0, sgi_80 = 0;
103
104 if (sta) {
105 sgi_20 = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_20;
106 sgi_40 = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_40;
107 sgi_80 = sta->vht_cap.cap & IEEE80211_VHT_CAP_SHORT_GI_80;
108 sta_entry = (struct rtl_sta_info *)sta->drv_priv;
109 wireless_mode = sta_entry->wireless_mode;
110 }
111 rate->count = tries;
112 rate->idx = rix >= 0x00 ? rix : 0x00;
113 if (rtlpriv->rtlhal.hw_type == HARDWARE_TYPE_RTL8812AE &&
114 wireless_mode == WIRELESS_MODE_AC_5G)
115 rate->idx += 0x10;/*2NSS for 8812AE*/
116
117 if (!not_data) {
118 if (txrc->short_preamble)
119 rate->flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
120 if (mac->opmode == NL80211_IFTYPE_AP ||
121 mac->opmode == NL80211_IFTYPE_ADHOC) {
122 if (sta && (sta->ht_cap.cap &
123 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
124 rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
125 if (sta && (sta->vht_cap.vht_supported))
126 rate->flags |= IEEE80211_TX_RC_80_MHZ_WIDTH;
127 } else {
128 if (mac->bw_40)
129 rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
130 if (mac->bw_80)
131 rate->flags |= IEEE80211_TX_RC_80_MHZ_WIDTH;
132 }
133
134 if (sgi_20 || sgi_40 || sgi_80)
135 rate->flags |= IEEE80211_TX_RC_SHORT_GI;
136 if (sta && sta->ht_cap.ht_supported &&
137 ((wireless_mode == WIRELESS_MODE_N_5G) ||
138 (wireless_mode == WIRELESS_MODE_N_24G)))
139 rate->flags |= IEEE80211_TX_RC_MCS;
140 }
141 }
142
rtl_get_rate(void * ppriv,struct ieee80211_sta * sta,void * priv_sta,struct ieee80211_tx_rate_control * txrc)143 static void rtl_get_rate(void *ppriv, struct ieee80211_sta *sta,
144 void *priv_sta,
145 struct ieee80211_tx_rate_control *txrc)
146 {
147 struct rtl_priv *rtlpriv = ppriv;
148 struct sk_buff *skb = txrc->skb;
149 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
150 struct ieee80211_tx_rate *rates = tx_info->control.rates;
151 __le16 fc = rtl_get_fc(skb);
152 u8 try_per_rate, i, rix;
153 bool not_data = !ieee80211_is_data(fc);
154
155 if (rate_control_send_low(sta, priv_sta, txrc))
156 return;
157
158 rix = _rtl_rc_get_highest_rix(rtlpriv, sta, skb, not_data);
159 try_per_rate = 1;
160 _rtl_rc_rate_set_series(rtlpriv, sta, &rates[0], txrc,
161 try_per_rate, rix, 1, not_data);
162
163 if (!not_data) {
164 for (i = 1; i < 4; i++)
165 _rtl_rc_rate_set_series(rtlpriv, sta, &rates[i],
166 txrc, i, (rix - i), 1,
167 not_data);
168 }
169 }
170
_rtl_tx_aggr_check(struct rtl_priv * rtlpriv,struct rtl_sta_info * sta_entry,u16 tid)171 static bool _rtl_tx_aggr_check(struct rtl_priv *rtlpriv,
172 struct rtl_sta_info *sta_entry, u16 tid)
173 {
174 struct rtl_mac *mac = rtl_mac(rtlpriv);
175
176 if (mac->act_scanning)
177 return false;
178
179 if (mac->opmode == NL80211_IFTYPE_STATION &&
180 mac->cnt_after_linked < 3)
181 return false;
182
183 if (sta_entry->tids[tid].agg.agg_state == RTL_AGG_STOP)
184 return true;
185
186 return false;
187 }
188
189 /*mac80211 Rate Control callbacks*/
rtl_tx_status(void * ppriv,struct ieee80211_supported_band * sband,struct ieee80211_sta * sta,void * priv_sta,struct sk_buff * skb)190 static void rtl_tx_status(void *ppriv,
191 struct ieee80211_supported_band *sband,
192 struct ieee80211_sta *sta, void *priv_sta,
193 struct sk_buff *skb)
194 {
195 struct rtl_priv *rtlpriv = ppriv;
196 struct rtl_mac *mac = rtl_mac(rtlpriv);
197 struct ieee80211_hdr *hdr = rtl_get_hdr(skb);
198 __le16 fc = rtl_get_fc(skb);
199 struct rtl_sta_info *sta_entry;
200
201 if (!priv_sta || !ieee80211_is_data(fc))
202 return;
203
204 if (rtl_is_special_data(mac->hw, skb, true))
205 return;
206
207 if (is_multicast_ether_addr(ieee80211_get_DA(hdr)) ||
208 is_broadcast_ether_addr(ieee80211_get_DA(hdr)))
209 return;
210
211 if (sta) {
212 /* Check if aggregation has to be enabled for this tid */
213 sta_entry = (struct rtl_sta_info *) sta->drv_priv;
214 if ((sta->ht_cap.ht_supported) &&
215 !(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
216 if (ieee80211_is_data_qos(fc)) {
217 u8 tid = rtl_get_tid(skb);
218 if (_rtl_tx_aggr_check(rtlpriv, sta_entry,
219 tid)) {
220 sta_entry->tids[tid].agg.agg_state =
221 RTL_AGG_PROGRESS;
222 ieee80211_start_tx_ba_session(sta, tid,
223 5000);
224 }
225 }
226 }
227 }
228 }
229
rtl_rate_init(void * ppriv,struct ieee80211_supported_band * sband,struct cfg80211_chan_def * chandef,struct ieee80211_sta * sta,void * priv_sta)230 static void rtl_rate_init(void *ppriv,
231 struct ieee80211_supported_band *sband,
232 struct cfg80211_chan_def *chandef,
233 struct ieee80211_sta *sta, void *priv_sta)
234 {
235 }
236
rtl_rate_update(void * ppriv,struct ieee80211_supported_band * sband,struct cfg80211_chan_def * chandef,struct ieee80211_sta * sta,void * priv_sta,u32 changed)237 static void rtl_rate_update(void *ppriv,
238 struct ieee80211_supported_band *sband,
239 struct cfg80211_chan_def *chandef,
240 struct ieee80211_sta *sta, void *priv_sta,
241 u32 changed)
242 {
243 }
244
rtl_rate_alloc(struct ieee80211_hw * hw,struct dentry * debugfsdir)245 static void *rtl_rate_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
246 {
247 struct rtl_priv *rtlpriv = rtl_priv(hw);
248 return rtlpriv;
249 }
250
rtl_rate_free(void * rtlpriv)251 static void rtl_rate_free(void *rtlpriv)
252 {
253 return;
254 }
255
rtl_rate_alloc_sta(void * ppriv,struct ieee80211_sta * sta,gfp_t gfp)256 static void *rtl_rate_alloc_sta(void *ppriv,
257 struct ieee80211_sta *sta, gfp_t gfp)
258 {
259 struct rtl_priv *rtlpriv = ppriv;
260 struct rtl_rate_priv *rate_priv;
261
262 rate_priv = kzalloc(sizeof(struct rtl_rate_priv), gfp);
263 if (!rate_priv) {
264 RT_TRACE(rtlpriv, COMP_ERR, DBG_EMERG,
265 "Unable to allocate private rc structure\n");
266 return NULL;
267 }
268
269 rtlpriv->rate_priv = rate_priv;
270
271 return rate_priv;
272 }
273
rtl_rate_free_sta(void * rtlpriv,struct ieee80211_sta * sta,void * priv_sta)274 static void rtl_rate_free_sta(void *rtlpriv,
275 struct ieee80211_sta *sta, void *priv_sta)
276 {
277 struct rtl_rate_priv *rate_priv = priv_sta;
278 kfree(rate_priv);
279 }
280
281 static struct rate_control_ops rtl_rate_ops = {
282 .name = "rtl_rc",
283 .alloc = rtl_rate_alloc,
284 .free = rtl_rate_free,
285 .alloc_sta = rtl_rate_alloc_sta,
286 .free_sta = rtl_rate_free_sta,
287 .rate_init = rtl_rate_init,
288 .rate_update = rtl_rate_update,
289 .tx_status = rtl_tx_status,
290 .get_rate = rtl_get_rate,
291 };
292
rtl_rate_control_register(void)293 int rtl_rate_control_register(void)
294 {
295 return ieee80211_rate_control_register(&rtl_rate_ops);
296 }
297
rtl_rate_control_unregister(void)298 void rtl_rate_control_unregister(void)
299 {
300 ieee80211_rate_control_unregister(&rtl_rate_ops);
301 }
302