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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 | * 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 | */ | |
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 stg_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 (rtl92e_is_special_data(rtlpriv->mac80211.hw, skb, true) || | |
60 | not_data) { | |
61 | return 0; | |
62 | } else { | |
63 | if (rtlhal->current_bandtype == BAND_ON_2_4G) { | |
64 | if (wireless_mode == WIRELESS_MODE_B) { | |
65 | return B_MODE_MAX_RIX; | |
66 | } else if (wireless_mode == WIRELESS_MODE_G) { | |
67 | return G_MODE_MAX_RIX; | |
68 | } else if (wireless_mode == WIRELESS_MODE_N_24G) { | |
69 | if (get_rf_type(rtlphy) != RF_2T2R) | |
70 | return N_MODE_MCS7_RIX; | |
71 | else | |
72 | return N_MODE_MCS15_RIX; | |
73 | } else if (wireless_mode == WIRELESS_MODE_AC_24G) { | |
74 | return AC_MODE_MCS9_RIX; | |
75 | } else { | |
76 | return 0; | |
77 | } | |
78 | } else { | |
79 | if (wireless_mode == WIRELESS_MODE_A) { | |
80 | return A_MODE_MAX_RIX; | |
81 | } else if (wireless_mode == WIRELESS_MODE_N_5G) { | |
82 | if (get_rf_type(rtlphy) != RF_2T2R) | |
83 | return N_MODE_MCS7_RIX; | |
84 | else | |
85 | return N_MODE_MCS15_RIX; | |
86 | } else if (wireless_mode == WIRELESS_MODE_AC_5G) { | |
87 | return AC_MODE_MCS9_RIX; | |
88 | } else { | |
89 | return 0; | |
90 | } | |
91 | } | |
92 | } | |
93 | } | |
94 | ||
95 | static void _rtl_rc_rate_set_series(struct rtl_priv *rtlpriv, | |
96 | struct ieee80211_sta *sta, | |
97 | struct ieee80211_tx_rate *rate, | |
98 | struct ieee80211_tx_rate_control *txrc, | |
99 | u8 tries, char rix, int rtsctsenable, | |
100 | bool not_data) | |
101 | { | |
102 | struct rtl_mac *mac = rtl_mac(rtlpriv); | |
103 | u8 sgi_20 = 0, sgi_40 = 0, sgi_80 = 0; | |
104 | ||
105 | if (sta) { | |
106 | sgi_20 = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_20; | |
107 | sgi_40 = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_40; | |
108 | sgi_80 = sta->vht_cap.cap & IEEE80211_VHT_CAP_SHORT_GI_80; | |
109 | } | |
110 | rate->count = tries; | |
111 | rate->idx = rix >= 0x00 ? rix : 0x00; | |
112 | ||
113 | if (!not_data) { | |
114 | if (txrc->short_preamble) | |
115 | rate->flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE; | |
116 | if (mac->opmode == NL80211_IFTYPE_AP || | |
117 | mac->opmode == NL80211_IFTYPE_ADHOC) { | |
118 | if (sta && (sta->ht_cap.cap & | |
119 | IEEE80211_HT_CAP_SUP_WIDTH_20_40)) | |
120 | rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; | |
121 | if (sta && (sta->vht_cap.vht_supported)) | |
122 | rate->flags |= IEEE80211_TX_RC_80_MHZ_WIDTH; | |
123 | } else { | |
124 | if (mac->bw_40) | |
125 | rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; | |
126 | if (mac->bw_80) | |
127 | rate->flags |= IEEE80211_TX_RC_80_MHZ_WIDTH; | |
128 | } | |
129 | ||
130 | if (sgi_20 || sgi_40 || sgi_80) | |
131 | rate->flags |= IEEE80211_TX_RC_SHORT_GI; | |
132 | if (sta && sta->ht_cap.ht_supported) | |
133 | rate->flags |= IEEE80211_TX_RC_MCS; | |
134 | if (sta && sta->vht_cap.vht_supported) | |
135 | rate->flags |= IEEE80211_TX_RC_VHT_MCS; | |
136 | } | |
137 | } | |
138 | ||
139 | static void rtl_get_rate(void *ppriv, struct ieee80211_sta *sta, | |
140 | void *priv_sta, | |
141 | struct ieee80211_tx_rate_control *txrc) | |
142 | { | |
143 | struct rtl_priv *rtlpriv = ppriv; | |
144 | struct sk_buff *skb = txrc->skb; | |
145 | struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb); | |
146 | struct ieee80211_tx_rate *rates = tx_info->control.rates; | |
147 | __le16 fc = rtl_get_fc(skb); | |
148 | u8 try_per_rate, i, rix; | |
149 | bool not_data = !ieee80211_is_data(fc); | |
150 | ||
151 | if (rate_control_send_low(sta, priv_sta, txrc)) | |
152 | return; | |
153 | ||
154 | rix = _rtl_rc_get_highest_rix(rtlpriv, sta, skb, not_data); | |
155 | try_per_rate = 1; | |
156 | _rtl_rc_rate_set_series(rtlpriv, sta, &rates[0], txrc, | |
157 | try_per_rate, rix, 1, not_data); | |
158 | ||
159 | if (!not_data) { | |
160 | for (i = 1; i < 4; i++) | |
161 | _rtl_rc_rate_set_series(rtlpriv, sta, &rates[i], | |
162 | txrc, i, (rix - i), 1, | |
163 | not_data); | |
164 | } | |
165 | } | |
166 | ||
167 | static bool _rtl_tx_aggr_check(struct rtl_priv *rtlpriv, | |
168 | struct rtl_sta_info *sta_entry, u16 tid) | |
169 | { | |
170 | struct rtl_mac *mac = rtl_mac(rtlpriv); | |
171 | ||
172 | if (mac->act_scanning) | |
173 | return false; | |
174 | ||
175 | if (mac->opmode == NL80211_IFTYPE_STATION && | |
176 | mac->cnt_after_linked < 3) | |
177 | return false; | |
178 | ||
179 | if (sta_entry->tids[tid].agg.agg_state == RTL_AGG_STOP) | |
180 | return true; | |
181 | ||
182 | return false; | |
183 | } | |
184 | ||
185 | /*mac80211 Rate Control callbacks*/ | |
186 | static void rtl_tx_status(void *ppriv, | |
187 | struct ieee80211_supported_band *sband, | |
188 | struct ieee80211_sta *sta, void *priv_sta, | |
189 | struct sk_buff *skb) | |
190 | { | |
191 | struct rtl_priv *rtlpriv = ppriv; | |
192 | struct rtl_mac *mac = rtl_mac(rtlpriv); | |
193 | struct ieee80211_hdr *hdr = rtl_get_hdr(skb); | |
194 | __le16 fc = rtl_get_fc(skb); | |
195 | struct rtl_sta_info *sta_entry; | |
196 | ||
197 | if (!priv_sta || !ieee80211_is_data(fc)) | |
198 | return; | |
199 | ||
200 | if (rtl92e_is_special_data(mac->hw, skb, true)) | |
201 | return; | |
202 | ||
203 | if (is_multicast_ether_addr(ieee80211_get_DA(hdr)) || | |
204 | is_broadcast_ether_addr(ieee80211_get_DA(hdr))) | |
205 | return; | |
206 | ||
207 | if (sta) { | |
208 | /* Check if aggregation has to be enabled for this tid */ | |
209 | sta_entry = (struct rtl_sta_info *)sta->drv_priv; | |
210 | if ((sta->ht_cap.ht_supported) && | |
211 | !(skb->protocol == cpu_to_be16(ETH_P_PAE))) { | |
212 | if (ieee80211_is_data_qos(fc)) { | |
213 | u8 tid = rtl_get_tid(skb); | |
214 | if (_rtl_tx_aggr_check(rtlpriv, sta_entry, | |
215 | tid)) { | |
216 | sta_entry->tids[tid].agg.agg_state = | |
217 | RTL_AGG_PROGRESS; | |
218 | ieee80211_start_tx_ba_session(sta, tid, | |
219 | 5000); | |
220 | } | |
221 | } | |
222 | } | |
223 | } | |
224 | } | |
225 | ||
226 | static void rtl_rate_init(void *ppriv, | |
227 | struct ieee80211_supported_band *sband, | |
228 | struct cfg80211_chan_def *chandef, | |
229 | struct ieee80211_sta *sta, void *priv_sta) | |
230 | { | |
231 | } | |
232 | ||
233 | static void *rtl_rate_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) | |
234 | { | |
235 | struct rtl_priv *rtlpriv = rtl_priv(hw); | |
236 | return rtlpriv; | |
237 | } | |
238 | ||
239 | static void rtl_rate_free(void *rtlpriv) | |
240 | { | |
241 | return; | |
242 | } | |
243 | ||
244 | static void *rtl_rate_alloc_sta(void *ppriv, | |
245 | struct ieee80211_sta *sta, gfp_t gfp) | |
246 | { | |
247 | struct rtl_priv *rtlpriv = ppriv; | |
248 | struct rtl_rate_priv *rate_priv; | |
249 | ||
250 | rate_priv = kzalloc(sizeof(*rate_priv), gfp); | |
251 | if (!rate_priv) { | |
252 | RT_TRACE(COMP_ERR, DBG_EMERG, | |
253 | ("Unable to allocate private rc structure\n")); | |
254 | return NULL; | |
255 | } | |
256 | ||
257 | rtlpriv->rate_priv = rate_priv; | |
258 | ||
259 | return rate_priv; | |
260 | } | |
261 | ||
262 | static void rtl_rate_free_sta(void *rtlpriv, | |
263 | struct ieee80211_sta *sta, void *priv_sta) | |
264 | { | |
265 | struct rtl_rate_priv *rate_priv = priv_sta; | |
266 | kfree(rate_priv); | |
267 | } | |
268 | ||
269 | static struct rate_control_ops rtl_rate_ops = { | |
09e4659e | 270 | .name = "rtl_rc_92e", |
78de2c06 LF |
271 | .alloc = rtl_rate_alloc, |
272 | .free = rtl_rate_free, | |
273 | .alloc_sta = rtl_rate_alloc_sta, | |
274 | .free_sta = rtl_rate_free_sta, | |
275 | .rate_init = rtl_rate_init, | |
276 | .tx_status = rtl_tx_status, | |
277 | .get_rate = rtl_get_rate, | |
278 | }; | |
279 | ||
280 | int rtl92e_rate_control_register(void) | |
281 | { | |
282 | return ieee80211_rate_control_register(&rtl_rate_ops); | |
283 | } | |
284 | ||
285 | void rtl92e_rate_control_unregister(void) | |
286 | { | |
287 | ieee80211_rate_control_unregister(&rtl_rate_ops); | |
288 | } |