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0c817338 LF |
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 | */ | |
40 | static u8 _rtl_rc_get_highest_rix(struct rtl_priv *rtlpriv, | |
c6a9de08 | 41 | struct ieee80211_sta *sta, |
0c817338 LF |
42 | struct sk_buff *skb, bool not_data) |
43 | { | |
44 | struct rtl_mac *rtlmac = rtl_mac(rtlpriv); | |
c6a9de08 C |
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; | |
0c817338 LF |
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 | */ | |
c6a9de08 C |
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 | } | |
0c817338 | 65 | } else { |
c6a9de08 C |
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 | } | |
0c817338 LF |
94 | } |
95 | } | |
96 | ||
97 | static void _rtl_rc_rate_set_series(struct rtl_priv *rtlpriv, | |
c6a9de08 | 98 | struct ieee80211_sta *sta, |
0c817338 LF |
99 | struct ieee80211_tx_rate *rate, |
100 | struct ieee80211_tx_rate_control *txrc, | |
c6a9de08 | 101 | u8 tries, char rix, int rtsctsenable, |
0c817338 LF |
102 | bool not_data) |
103 | { | |
104 | struct rtl_mac *mac = rtl_mac(rtlpriv); | |
c6a9de08 | 105 | u8 sgi_20 = 0, sgi_40 = 0; |
0c817338 | 106 | |
c6a9de08 C |
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 | } | |
0c817338 | 111 | rate->count = tries; |
c6a9de08 | 112 | rate->idx = rix >= 0x00 ? rix : 0x00; |
0c817338 LF |
113 | |
114 | if (!not_data) { | |
115 | if (txrc->short_preamble) | |
116 | rate->flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE; | |
c6a9de08 C |
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) | |
0c817338 | 127 | rate->flags |= IEEE80211_TX_RC_SHORT_GI; |
c6a9de08 | 128 | if (sta && sta->ht_cap.ht_supported) |
0c817338 LF |
129 | rate->flags |= IEEE80211_TX_RC_MCS; |
130 | } | |
131 | } | |
132 | ||
133 | static 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; | |
c6a9de08 | 140 | __le16 fc = rtl_get_fc(skb); |
0c817338 LF |
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 | ||
c6a9de08 | 147 | rix = _rtl_rc_get_highest_rix(rtlpriv, sta, skb, not_data); |
0c817338 | 148 | try_per_rate = 1; |
c6a9de08 | 149 | _rtl_rc_rate_set_series(rtlpriv, sta, &rates[0], txrc, |
0c817338 LF |
150 | try_per_rate, rix, 1, not_data); |
151 | ||
152 | if (!not_data) { | |
153 | for (i = 1; i < 4; i++) | |
c6a9de08 | 154 | _rtl_rc_rate_set_series(rtlpriv, sta, &rates[i], |
0c817338 LF |
155 | txrc, i, (rix - i), 1, |
156 | not_data); | |
157 | } | |
158 | } | |
159 | ||
c6a9de08 C |
160 | static bool _rtl_tx_aggr_check(struct rtl_priv *rtlpriv, |
161 | struct rtl_sta_info *sta_entry, u16 tid) | |
0c817338 LF |
162 | { |
163 | struct rtl_mac *mac = rtl_mac(rtlpriv); | |
164 | ||
165 | if (mac->act_scanning) | |
166 | return false; | |
167 | ||
c6a9de08 C |
168 | if (mac->opmode == NL80211_IFTYPE_STATION && |
169 | mac->cnt_after_linked < 3) | |
0c817338 LF |
170 | return false; |
171 | ||
c6a9de08 | 172 | if (sta_entry->tids[tid].agg.agg_state == RTL_AGG_STOP) |
0c817338 LF |
173 | return true; |
174 | ||
175 | return false; | |
176 | } | |
177 | ||
178 | /*mac80211 Rate Control callbacks*/ | |
179 | static 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); | |
c6a9de08 C |
186 | struct ieee80211_hdr *hdr = rtl_get_hdr(skb); |
187 | __le16 fc = rtl_get_fc(skb); | |
188 | struct rtl_sta_info *sta_entry; | |
0c817338 LF |
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 | ||
c6a9de08 C |
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 == true) && | |
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 | } | |
0c817338 LF |
215 | } |
216 | } | |
217 | } | |
218 | ||
219 | static void rtl_rate_init(void *ppriv, | |
220 | struct ieee80211_supported_band *sband, | |
221 | struct ieee80211_sta *sta, void *priv_sta) | |
222 | { | |
0c817338 LF |
223 | } |
224 | ||
225 | static 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 | { | |
0c817338 LF |
231 | } |
232 | ||
233 | static 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 | ||
240 | static void rtl_rate_free(void *rtlpriv) | |
241 | { | |
242 | return; | |
243 | } | |
244 | ||
245 | static 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 | ||
263 | static 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 | ||
270 | static 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 | ||
283 | int rtl_rate_control_register(void) | |
284 | { | |
285 | return ieee80211_rate_control_register(&rtl_rate_ops); | |
286 | } | |
287 | ||
288 | void rtl_rate_control_unregister(void) | |
289 | { | |
290 | ieee80211_rate_control_unregister(&rtl_rate_ops); | |
291 | } |