tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 *highest rate based on wireless mode used for iwconfig
39 *show Tx rate.
40 */
41static u8 _rtl_rc_get_highest_rix(struct rtl_priv *rtlpriv,
42 struct ieee80211_sta *sta,
43 struct sk_buff *skb, bool not_data)
44{
45 struct rtl_mac *rtlmac = rtl_mac(rtlpriv);
46 struct rtl_hal *rtlhal = rtl_hal(rtlpriv);
47 struct rtl_phy *rtlphy = &(rtlpriv->phy);
48 struct rtl_sta_info *sta_entry = NULL;
49 u8 wireless_mode = 0;
50
51 /*
52 *this rate is no use for true rate, firmware
53 *will control rate at all it just used for
54 *1.show in iwconfig in B/G mode
55 *2.in rtl_get_tcb_desc when we check rate is
56 * 1M we will not use FW rate but user rate.
57 */
58 if (rtlmac->opmode == NL80211_IFTYPE_AP ||
59 rtlmac->opmode == NL80211_IFTYPE_ADHOC ||
60 rtlmac->opmode == NL80211_IFTYPE_MESH_POINT) {
61 if (sta) {
62 sta_entry = (struct rtl_sta_info *) sta->drv_priv;
63 wireless_mode = sta_entry->wireless_mode;
64 } else {
65 return 0;
66 }
67 } else {
68 wireless_mode = rtlmac->mode;
69 }
70
71 if (rtl_is_special_data(rtlpriv->mac80211.hw, skb, true) || not_data) {
72 return 0;
73 } else {
74 if (rtlhal->current_bandtype == BAND_ON_2_4G) {
75 if (wireless_mode == WIRELESS_MODE_B) {
76 return B_MODE_MAX_RIX;
77 } else if (wireless_mode == WIRELESS_MODE_G) {
78 return G_MODE_MAX_RIX;
79 } else {
80 if (get_rf_type(rtlphy) != RF_2T2R)
81 return N_MODE_MCS7_RIX;
82 else
83 return N_MODE_MCS15_RIX;
84 }
85 } else {
86 if (wireless_mode == WIRELESS_MODE_A) {
87 return A_MODE_MAX_RIX;
88 } else {
89 if (get_rf_type(rtlphy) != RF_2T2R)
90 return N_MODE_MCS7_RIX;
91 else
92 return N_MODE_MCS15_RIX;
93 }
94 }
95 }
96}
97
98static void _rtl_rc_rate_set_series(struct rtl_priv *rtlpriv,
99 struct ieee80211_sta *sta,
100 struct ieee80211_tx_rate *rate,
101 struct ieee80211_tx_rate_control *txrc,
102 u8 tries, char rix, int rtsctsenable,
103 bool not_data)
104{
105 struct rtl_mac *mac = rtl_mac(rtlpriv);
106 u8 sgi_20 = 0, sgi_40 = 0;
107
108 if (sta) {
109 sgi_20 = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_20;
110 sgi_40 = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_40;
111 }
112 rate->count = tries;
113 rate->idx = rix >= 0x00 ? rix : 0x00;
114
115 if (!not_data) {
116 if (txrc->short_preamble)
117 rate->flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
118 if (mac->opmode == NL80211_IFTYPE_AP ||
119 mac->opmode == NL80211_IFTYPE_ADHOC) {
120 if (sta && (sta->ht_cap.cap &
121 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
122 rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
123 } else {
124 if (mac->bw_40)
125 rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
126 }
127 if (sgi_20 || sgi_40)
128 rate->flags |= IEEE80211_TX_RC_SHORT_GI;
129 if (sta && sta->ht_cap.ht_supported)
130 rate->flags |= IEEE80211_TX_RC_MCS;
131 }
132}
133
134static void rtl_get_rate(void *ppriv, struct ieee80211_sta *sta,
135 void *priv_sta,
136 struct ieee80211_tx_rate_control *txrc)
137{
138 struct rtl_priv *rtlpriv = ppriv;
139 struct sk_buff *skb = txrc->skb;
140 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
141 struct ieee80211_tx_rate *rates = tx_info->control.rates;
142 __le16 fc = rtl_get_fc(skb);
143 u8 try_per_rate, i, rix;
144 bool not_data = !ieee80211_is_data(fc);
145
146 if (rate_control_send_low(sta, priv_sta, txrc))
147 return;
148
149 rix = _rtl_rc_get_highest_rix(rtlpriv, sta, skb, not_data);
150 try_per_rate = 1;
151 _rtl_rc_rate_set_series(rtlpriv, sta, &rates[0], txrc,
152 try_per_rate, rix, 1, not_data);
153
154 if (!not_data) {
155 for (i = 1; i < 4; i++)
156 _rtl_rc_rate_set_series(rtlpriv, sta, &rates[i],
157 txrc, i, (rix - i), 1,
158 not_data);
159 }
160}
161
162static bool _rtl_tx_aggr_check(struct rtl_priv *rtlpriv,
163 struct rtl_sta_info *sta_entry, u16 tid)
164{
165 struct rtl_mac *mac = rtl_mac(rtlpriv);
166
167 if (mac->act_scanning)
168 return false;
169
170 if (mac->opmode == NL80211_IFTYPE_STATION &&
171 mac->cnt_after_linked < 3)
172 return false;
173
174 if (sta_entry->tids[tid].agg.agg_state == RTL_AGG_STOP)
175 return true;
176
177 return false;
178}
179
180/*mac80211 Rate Control callbacks*/
181static void rtl_tx_status(void *ppriv,
182 struct ieee80211_supported_band *sband,
183 struct ieee80211_sta *sta, void *priv_sta,
184 struct sk_buff *skb)
185{
186 struct rtl_priv *rtlpriv = ppriv;
187 struct rtl_mac *mac = rtl_mac(rtlpriv);
188 struct ieee80211_hdr *hdr = rtl_get_hdr(skb);
189 __le16 fc = rtl_get_fc(skb);
190 struct rtl_sta_info *sta_entry;
191
192 if (!priv_sta || !ieee80211_is_data(fc))
193 return;
194
195 if (rtl_is_special_data(mac->hw, skb, true))
196 return;
197
198 if (is_multicast_ether_addr(ieee80211_get_DA(hdr)) ||
199 is_broadcast_ether_addr(ieee80211_get_DA(hdr)))
200 return;
201
202 if (sta) {
203 /* Check if aggregation has to be enabled for this tid */
204 sta_entry = (struct rtl_sta_info *) sta->drv_priv;
205 if ((sta->ht_cap.ht_supported == true) &&
206 !(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
207 if (ieee80211_is_data_qos(fc)) {
208 u8 tid = rtl_get_tid(skb);
209 if (_rtl_tx_aggr_check(rtlpriv, sta_entry,
210 tid)) {
211 sta_entry->tids[tid].agg.agg_state =
212 RTL_AGG_PROGRESS;
213 ieee80211_start_tx_ba_session(sta, tid,
214 5000);
215 }
216 }
217 }
218 }
219}
220
221static void rtl_rate_init(void *ppriv,
222 struct ieee80211_supported_band *sband,
223 struct cfg80211_chan_def *chandef,
224 struct ieee80211_sta *sta, void *priv_sta)
225{
226}
227static void rtl_rate_update(void *ppriv,
228 struct ieee80211_supported_band *sband,
229 struct cfg80211_chan_def *chandef,
230 struct ieee80211_sta *sta, void *priv_sta,
231 u32 changed)
232{
233}
234static void *rtl_rate_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
235{
236 struct rtl_priv *rtlpriv = rtl_priv(hw);
237 return rtlpriv;
238}
239
240static void rtl_rate_free(void *rtlpriv)
241{
242 return;
243}
244
245static 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(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
263static 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
270static struct rate_control_ops rtl_rate_ops = {
271 .name = "rtl_rc_21ae",
272 .alloc = rtl_rate_alloc,
273 .free = rtl_rate_free,
274 .alloc_sta = rtl_rate_alloc_sta,
275 .free_sta = rtl_rate_free_sta,
276 .rate_init = rtl_rate_init,
277 .rate_update = rtl_rate_update,
278 .tx_status = rtl_tx_status,
279 .get_rate = rtl_get_rate,
280};
281
282int rtl_rate_control_register(void)
283{
284 return ieee80211_rate_control_register(&rtl_rate_ops);
285}
286
287void rtl_rate_control_unregister(void)
288{
289 ieee80211_rate_control_unregister(&rtl_rate_ops);
290}