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1// SPDX-License-Identifier: GPL-2.0
2/* Copyright(c) 2009-2012 Realtek Corporation.*/
3
4#include "wifi.h"
5#include "base.h"
6#include "rc.h"
7
8/*
9 *Finds the highest rate index we can use
10 *if skb is special data like DHCP/EAPOL, we set should
11 *it to lowest rate CCK_1M, otherwise we set rate to
12 *highest rate based on wireless mode used for iwconfig
13 *show Tx rate.
14 */
15static u8 _rtl_rc_get_highest_rix(struct rtl_priv *rtlpriv,
16 struct ieee80211_sta *sta,
17 struct sk_buff *skb, bool not_data)
18{
19 struct rtl_hal *rtlhal = rtl_hal(rtlpriv);
20 struct rtl_phy *rtlphy = &(rtlpriv->phy);
21 struct rtl_sta_info *sta_entry = NULL;
22 u16 wireless_mode = 0;
23 u8 nss;
24 struct ieee80211_tx_rate rate;
25
26 switch (get_rf_type(rtlphy)) {
27 case RF_4T4R:
28 nss = 4;
29 break;
30 case RF_3T3R:
31 nss = 3;
32 break;
33 case RF_2T2R:
34 nss = 2;
35 break;
36 default:
37 nss = 1;
38 break;
39 }
40
41 /*
42 *this rate is no use for true rate, firmware
43 *will control rate at all it just used for
44 *1.show in iwconfig in B/G mode
45 *2.in rtl_get_tcb_desc when we check rate is
46 * 1M we will not use FW rate but user rate.
47 */
48
49 if (sta) {
50 sta_entry = (struct rtl_sta_info *)sta->drv_priv;
51 wireless_mode = sta_entry->wireless_mode;
52 }
53
54 if (rtl_is_special_data(rtlpriv->mac80211.hw, skb, true, false) ||
55 not_data) {
56 return 0;
57 } else {
58 if (rtlhal->current_bandtype == BAND_ON_2_4G) {
59 if (wireless_mode == WIRELESS_MODE_B) {
60 return B_MODE_MAX_RIX;
61 } else if (wireless_mode == WIRELESS_MODE_G) {
62 return G_MODE_MAX_RIX;
63 } else if (wireless_mode == WIRELESS_MODE_N_24G) {
64 if (nss == 1)
65 return N_MODE_MCS7_RIX;
66 else
67 return N_MODE_MCS15_RIX;
68 } else if (wireless_mode == WIRELESS_MODE_AC_24G) {
69 if (sta->deflink.bandwidth == IEEE80211_STA_RX_BW_20) {
70 ieee80211_rate_set_vht(&rate,
71 AC_MODE_MCS8_RIX,
72 nss);
73 goto out;
74 } else {
75 ieee80211_rate_set_vht(&rate,
76 AC_MODE_MCS9_RIX,
77 nss);
78 goto out;
79 }
80 }
81 return 0;
82 } else {
83 if (wireless_mode == WIRELESS_MODE_A) {
84 return A_MODE_MAX_RIX;
85 } else if (wireless_mode == WIRELESS_MODE_N_5G) {
86 if (nss == 1)
87 return N_MODE_MCS7_RIX;
88 else
89 return N_MODE_MCS15_RIX;
90 } else if (wireless_mode == WIRELESS_MODE_AC_5G) {
91 if (sta->deflink.bandwidth == IEEE80211_STA_RX_BW_20) {
92 ieee80211_rate_set_vht(&rate,
93 AC_MODE_MCS8_RIX,
94 nss);
95 goto out;
96 } else {
97 ieee80211_rate_set_vht(&rate,
98 AC_MODE_MCS9_RIX,
99 nss);
100 goto out;
101 }
102 }
103 return 0;
104 }
105 }
106
107out:
108 return rate.idx;
109}
110
111static void _rtl_rc_rate_set_series(struct rtl_priv *rtlpriv,
112 struct ieee80211_sta *sta,
113 struct ieee80211_tx_rate *rate,
114 struct ieee80211_tx_rate_control *txrc,
115 u8 tries, s8 rix, int rtsctsenable,
116 bool not_data)
117{
118 struct rtl_mac *mac = rtl_mac(rtlpriv);
119 struct rtl_sta_info *sta_entry = NULL;
120 u16 wireless_mode = 0;
121 u8 sgi_20 = 0, sgi_40 = 0, sgi_80 = 0;
122
123 if (sta) {
124 sgi_20 = sta->deflink.ht_cap.cap & IEEE80211_HT_CAP_SGI_20;
125 sgi_40 = sta->deflink.ht_cap.cap & IEEE80211_HT_CAP_SGI_40;
126 sgi_80 = sta->deflink.vht_cap.cap & IEEE80211_VHT_CAP_SHORT_GI_80;
127 sta_entry = (struct rtl_sta_info *)sta->drv_priv;
128 wireless_mode = sta_entry->wireless_mode;
129 }
130 rate->count = tries;
131 rate->idx = rix >= 0x00 ? rix : 0x00;
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->deflink.ht_cap.cap &
139 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
140 rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
141 if (sta && sta->deflink.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->deflink.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->deflink.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 rix = _rtl_rc_get_highest_rix(rtlpriv, sta, skb, not_data);
177 try_per_rate = 1;
178 _rtl_rc_rate_set_series(rtlpriv, sta, &rates[0], txrc,
179 try_per_rate, rix, 1, not_data);
180
181 if (!not_data) {
182 for (i = 1; i < 4; i++)
183 _rtl_rc_rate_set_series(rtlpriv, sta, &rates[i],
184 txrc, i, (rix - i), 1,
185 not_data);
186 }
187}
188
189static bool _rtl_tx_aggr_check(struct rtl_priv *rtlpriv,
190 struct rtl_sta_info *sta_entry, u16 tid)
191{
192 struct rtl_mac *mac = rtl_mac(rtlpriv);
193
194 if (mac->act_scanning)
195 return false;
196
197 if (mac->opmode == NL80211_IFTYPE_STATION &&
198 mac->cnt_after_linked < 3)
199 return false;
200
201 if (sta_entry->tids[tid].agg.agg_state == RTL_AGG_STOP)
202 return true;
203
204 return false;
205}
206
207/*mac80211 Rate Control callbacks*/
208static void rtl_tx_status(void *ppriv,
209 struct ieee80211_supported_band *sband,
210 struct ieee80211_sta *sta, void *priv_sta,
211 struct sk_buff *skb)
212{
213 struct rtl_priv *rtlpriv = ppriv;
214 struct rtl_mac *mac = rtl_mac(rtlpriv);
215 struct ieee80211_hdr *hdr = rtl_get_hdr(skb);
216 __le16 fc = rtl_get_fc(skb);
217 struct rtl_sta_info *sta_entry;
218
219 if (!priv_sta || !ieee80211_is_data(fc))
220 return;
221
222 if (rtl_is_special_data(mac->hw, skb, true, true))
223 return;
224
225 if (is_multicast_ether_addr(ieee80211_get_DA(hdr)) ||
226 is_broadcast_ether_addr(ieee80211_get_DA(hdr)))
227 return;
228
229 if (sta) {
230 /* Check if aggregation has to be enabled for this tid */
231 sta_entry = (struct rtl_sta_info *)sta->drv_priv;
232 if (sta->deflink.ht_cap.ht_supported &&
233 !(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
234 if (ieee80211_is_data_qos(fc)) {
235 u8 tid = rtl_get_tid(skb);
236
237 if (_rtl_tx_aggr_check(rtlpriv, sta_entry,
238 tid)) {
239 sta_entry->tids[tid].agg.agg_state =
240 RTL_AGG_PROGRESS;
241 ieee80211_start_tx_ba_session(sta, tid,
242 5000);
243 }
244 }
245 }
246 }
247}
248
249static void rtl_rate_init(void *ppriv,
250 struct ieee80211_supported_band *sband,
251 struct cfg80211_chan_def *chandef,
252 struct ieee80211_sta *sta, void *priv_sta)
253{
254}
255
256static void rtl_rate_update(void *ppriv,
257 struct ieee80211_supported_band *sband,
258 struct cfg80211_chan_def *chandef,
259 struct ieee80211_sta *sta, void *priv_sta,
260 u32 changed)
261{
262}
263
264static void *rtl_rate_alloc(struct ieee80211_hw *hw)
265{
266 struct rtl_priv *rtlpriv = rtl_priv(hw);
267 return rtlpriv;
268}
269
270static void rtl_rate_free(void *rtlpriv)
271{
272 return;
273}
274
275static void *rtl_rate_alloc_sta(void *ppriv,
276 struct ieee80211_sta *sta, gfp_t gfp)
277{
278 struct rtl_priv *rtlpriv = ppriv;
279 struct rtl_rate_priv *rate_priv;
280
281 rate_priv = kzalloc(sizeof(*rate_priv), gfp);
282 if (!rate_priv)
283 return NULL;
284
285 rtlpriv->rate_priv = rate_priv;
286
287 return rate_priv;
288}
289
290static void rtl_rate_free_sta(void *rtlpriv,
291 struct ieee80211_sta *sta, void *priv_sta)
292{
293 struct rtl_rate_priv *rate_priv = priv_sta;
294
295 kfree(rate_priv);
296}
297
298static const struct rate_control_ops rtl_rate_ops = {
299 .name = "rtl_rc",
300 .alloc = rtl_rate_alloc,
301 .free = rtl_rate_free,
302 .alloc_sta = rtl_rate_alloc_sta,
303 .free_sta = rtl_rate_free_sta,
304 .rate_init = rtl_rate_init,
305 .rate_update = rtl_rate_update,
306 .tx_status = rtl_tx_status,
307 .get_rate = rtl_get_rate,
308};
309
310int rtl_rate_control_register(void)
311{
312 return ieee80211_rate_control_register(&rtl_rate_ops);
313}
314
315void rtl_rate_control_unregister(void)
316{
317 ieee80211_rate_control_unregister(&rtl_rate_ops);
318}