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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 */
37static 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 u16 wireless_mode = 0;
45 u8 nss; /* NSS -1 */
46
47 if (get_rf_type(rtlphy) >= RF_4T4R)
48 nss = 3;
49 else if (get_rf_type(rtlphy) >= RF_3T3R)
50 nss = 2;
51 else if (get_rf_type(rtlphy) >= RF_2T2R)
52 nss = 1;
53 else
54 nss = 0;
55
56 /*
57 *this rate is no use for true rate, firmware
58 *will control rate at all it just used for
59 *1.show in iwconfig in B/G mode
60 *2.in rtl_get_tcb_desc when we check rate is
61 * 1M we will not use FW rate but user rate.
62 */
63
64 if (sta) {
65 sta_entry = (struct rtl_sta_info *)sta->drv_priv;
66 wireless_mode = sta_entry->wireless_mode;
67 }
68
69 if (rtl_is_special_data(rtlpriv->mac80211.hw, skb, true, false) ||
70 not_data) {
71 return 0;
72 }
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 if (wireless_mode == WIRELESS_MODE_N_24G) {
79 if (nss == 0)
80 return N_MODE_MCS7_RIX;
81 else
82 return N_MODE_MCS15_RIX;
83 } else if (wireless_mode == WIRELESS_MODE_AC_24G) {
84 if (sta->bandwidth == IEEE80211_STA_RX_BW_20)
85 return AC_MODE_MCS8_RIX | (nss << 4);
86 else
87 return AC_MODE_MCS9_RIX | (nss << 4);
88 }
89 return 0;
90 }
91 if (wireless_mode == WIRELESS_MODE_A) {
92 return A_MODE_MAX_RIX;
93 } else if (wireless_mode == WIRELESS_MODE_N_5G) {
94 if (nss == 0)
95 return N_MODE_MCS7_RIX;
96 else
97 return N_MODE_MCS15_RIX;
98 } else if (wireless_mode == WIRELESS_MODE_AC_5G) {
99 if (sta->bandwidth == IEEE80211_STA_RX_BW_20)
100 return AC_MODE_MCS8_RIX | (nss << 4);
101 else
102 return AC_MODE_MCS9_RIX | (nss << 4);
103 }
104 return 0;
105}
106
107static void _rtl_rc_rate_set_series(struct rtl_priv *rtlpriv,
108 struct ieee80211_sta *sta,
109 struct ieee80211_tx_rate *rate,
110 struct ieee80211_tx_rate_control *txrc,
111 u8 tries, s8 rix, int rtsctsenable,
112 bool not_data)
113{
114 struct rtl_mac *mac = rtl_mac(rtlpriv);
115 struct rtl_sta_info *sta_entry = NULL;
116 u16 wireless_mode = 0;
117 u8 sgi_20 = 0, sgi_40 = 0, sgi_80 = 0;
118
119 if (sta) {
120 sgi_20 = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_20;
121 sgi_40 = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_40;
122 sgi_80 = sta->vht_cap.cap & IEEE80211_VHT_CAP_SHORT_GI_80;
123 sta_entry = (struct rtl_sta_info *)sta->drv_priv;
124 wireless_mode = sta_entry->wireless_mode;
125 }
126 rate->count = tries;
127 rate->idx = rix >= 0x00 ? rix : 0x00;
128 if ((rtlpriv->rtlhal.hw_type == HARDWARE_TYPE_RTL8812AE ||
129 rtlpriv->rtlhal.hw_type == HARDWARE_TYPE_RTL8822BE) &&
130 wireless_mode == WIRELESS_MODE_AC_5G)
131 rate->idx |= 0x10;/*2NSS for 8812AE, 8822BE*/
132
133 if (!not_data) {
134 if (txrc->short_preamble)
135 rate->flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
136 if (mac->opmode == NL80211_IFTYPE_AP ||
137 mac->opmode == NL80211_IFTYPE_ADHOC) {
138 if (sta && (sta->ht_cap.cap &
139 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
140 rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
141 if (sta && sta->vht_cap.vht_supported)
142 rate->flags |= IEEE80211_TX_RC_80_MHZ_WIDTH;
143 } else {
144 if (mac->bw_80)
145 rate->flags |= IEEE80211_TX_RC_80_MHZ_WIDTH;
146 else if (mac->bw_40)
147 rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
148 }
149
150 if (sgi_20 || sgi_40 || sgi_80)
151 rate->flags |= IEEE80211_TX_RC_SHORT_GI;
152 if (sta && sta->ht_cap.ht_supported &&
153 (wireless_mode == WIRELESS_MODE_N_5G ||
154 wireless_mode == WIRELESS_MODE_N_24G))
155 rate->flags |= IEEE80211_TX_RC_MCS;
156 if (sta && sta->vht_cap.vht_supported &&
157 (wireless_mode == WIRELESS_MODE_AC_5G ||
158 wireless_mode == WIRELESS_MODE_AC_24G ||
159 wireless_mode == WIRELESS_MODE_AC_ONLY))
160 rate->flags |= IEEE80211_TX_RC_VHT_MCS;
161 }
162}
163
164static void rtl_get_rate(void *ppriv, struct ieee80211_sta *sta,
165 void *priv_sta,
166 struct ieee80211_tx_rate_control *txrc)
167{
168 struct rtl_priv *rtlpriv = ppriv;
169 struct sk_buff *skb = txrc->skb;
170 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
171 struct ieee80211_tx_rate *rates = tx_info->control.rates;
172 __le16 fc = rtl_get_fc(skb);
173 u8 try_per_rate, i, rix;
174 bool not_data = !ieee80211_is_data(fc);
175
176 if (rate_control_send_low(sta, priv_sta, txrc))
177 return;
178
179 rix = _rtl_rc_get_highest_rix(rtlpriv, sta, skb, not_data);
180 try_per_rate = 1;
181 _rtl_rc_rate_set_series(rtlpriv, sta, &rates[0], txrc,
182 try_per_rate, rix, 1, not_data);
183
184 if (!not_data) {
185 for (i = 1; i < 4; i++)
186 _rtl_rc_rate_set_series(rtlpriv, sta, &rates[i],
187 txrc, i, (rix - i), 1,
188 not_data);
189 }
190}
191
192static bool _rtl_tx_aggr_check(struct rtl_priv *rtlpriv,
193 struct rtl_sta_info *sta_entry, u16 tid)
194{
195 struct rtl_mac *mac = rtl_mac(rtlpriv);
196
197 if (mac->act_scanning)
198 return false;
199
200 if (mac->opmode == NL80211_IFTYPE_STATION &&
201 mac->cnt_after_linked < 3)
202 return false;
203
204 if (sta_entry->tids[tid].agg.agg_state == RTL_AGG_STOP)
205 return true;
206
207 return false;
208}
209
210/*mac80211 Rate Control callbacks*/
211static void rtl_tx_status(void *ppriv,
212 struct ieee80211_supported_band *sband,
213 struct ieee80211_sta *sta, void *priv_sta,
214 struct sk_buff *skb)
215{
216 struct rtl_priv *rtlpriv = ppriv;
217 struct rtl_mac *mac = rtl_mac(rtlpriv);
218 struct ieee80211_hdr *hdr = rtl_get_hdr(skb);
219 __le16 fc = rtl_get_fc(skb);
220 struct rtl_sta_info *sta_entry;
221
222 if (!priv_sta || !ieee80211_is_data(fc))
223 return;
224
225 if (rtl_is_special_data(mac->hw, skb, true, true))
226 return;
227
228 if (is_multicast_ether_addr(ieee80211_get_DA(hdr)) ||
229 is_broadcast_ether_addr(ieee80211_get_DA(hdr)))
230 return;
231
232 if (sta) {
233 /* Check if aggregation has to be enabled for this tid */
234 sta_entry = (struct rtl_sta_info *)sta->drv_priv;
235 if (sta->ht_cap.ht_supported &&
236 !(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
237 if (ieee80211_is_data_qos(fc)) {
238 u8 tid = rtl_get_tid(skb);
239
240 if (_rtl_tx_aggr_check(rtlpriv, sta_entry,
241 tid)) {
242 sta_entry->tids[tid].agg.agg_state =
243 RTL_AGG_PROGRESS;
244 ieee80211_start_tx_ba_session(sta, tid,
245 5000);
246 }
247 }
248 }
249 }
250}
251
252static void rtl_rate_init(void *ppriv,
253 struct ieee80211_supported_band *sband,
254 struct cfg80211_chan_def *chandef,
255 struct ieee80211_sta *sta, void *priv_sta)
256{
257}
258
259static void rtl_rate_update(void *ppriv,
260 struct ieee80211_supported_band *sband,
261 struct cfg80211_chan_def *chandef,
262 struct ieee80211_sta *sta, void *priv_sta,
263 u32 changed)
264{
265}
266
267static void *rtl_rate_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
268{
269 struct rtl_priv *rtlpriv = rtl_priv(hw);
270 return rtlpriv;
271}
272
273static void rtl_rate_free(void *rtlpriv)
274{
275}
276
277static void *rtl_rate_alloc_sta(void *ppriv,
278 struct ieee80211_sta *sta, gfp_t gfp)
279{
280 struct rtl_priv *rtlpriv = ppriv;
281 struct rtl_rate_priv *rate_priv;
282
283 rate_priv = kzalloc(sizeof(*rate_priv), gfp);
284 if (!rate_priv)
285 return NULL;
286
287 rtlpriv->rate_priv = rate_priv;
288
289 return rate_priv;
290}
291
292static void rtl_rate_free_sta(void *rtlpriv,
293 struct ieee80211_sta *sta, void *priv_sta)
294{
295 struct rtl_rate_priv *rate_priv = priv_sta;
296
297 kfree(rate_priv);
298}
299
300static const struct rate_control_ops rtl_rate_ops = {
301 .name = "rtl_rc",
302 .alloc = rtl_rate_alloc,
303 .free = rtl_rate_free,
304 .alloc_sta = rtl_rate_alloc_sta,
305 .free_sta = rtl_rate_free_sta,
306 .rate_init = rtl_rate_init,
307 .rate_update = rtl_rate_update,
308 .tx_status = rtl_tx_status,
309 .get_rate = rtl_get_rate,
310};
311
312int rtl_rate_control_register(void)
313{
314 return ieee80211_rate_control_register(&rtl_rate_ops);
315}
316
317void rtl_rate_control_unregister(void)
318{
319 ieee80211_rate_control_unregister(&rtl_rate_ops);
320}