1 /*
2 * This file is part of wl1271
3 *
4 * Copyright (C) 2008-2009 Nokia Corporation
5 *
6 * Contact: Luciano Coelho <luciano.coelho@nokia.com>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * version 2 as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA
21 *
22 */
23
24 #include "ps.h"
25 #include "io.h"
26 #include "tx.h"
27 #include "debug.h"
28
wl1271_ps_set_mode(struct wl1271 * wl,struct wl12xx_vif * wlvif,enum wl1271_cmd_ps_mode mode)29 int wl1271_ps_set_mode(struct wl1271 *wl, struct wl12xx_vif *wlvif,
30 enum wl1271_cmd_ps_mode mode)
31 {
32 int ret;
33 u16 timeout = wl->conf.conn.dynamic_ps_timeout;
34
35 switch (mode) {
36 case STATION_AUTO_PS_MODE:
37 case STATION_POWER_SAVE_MODE:
38 wl1271_debug(DEBUG_PSM, "entering psm (mode=%d,timeout=%u)",
39 mode, timeout);
40
41 ret = wl1271_acx_wake_up_conditions(wl, wlvif,
42 wl->conf.conn.wake_up_event,
43 wl->conf.conn.listen_interval);
44 if (ret < 0) {
45 wl1271_error("couldn't set wake up conditions");
46 return ret;
47 }
48
49 ret = wl1271_cmd_ps_mode(wl, wlvif, mode, timeout);
50 if (ret < 0)
51 return ret;
52
53 set_bit(WLVIF_FLAG_IN_PS, &wlvif->flags);
54
55 /*
56 * enable beacon early termination.
57 * Not relevant for 5GHz and for high rates.
58 */
59 if ((wlvif->band == NL80211_BAND_2GHZ) &&
60 (wlvif->basic_rate < CONF_HW_BIT_RATE_9MBPS)) {
61 ret = wl1271_acx_bet_enable(wl, wlvif, true);
62 if (ret < 0)
63 return ret;
64 }
65 break;
66 case STATION_ACTIVE_MODE:
67 wl1271_debug(DEBUG_PSM, "leaving psm");
68
69 /* disable beacon early termination */
70 if ((wlvif->band == NL80211_BAND_2GHZ) &&
71 (wlvif->basic_rate < CONF_HW_BIT_RATE_9MBPS)) {
72 ret = wl1271_acx_bet_enable(wl, wlvif, false);
73 if (ret < 0)
74 return ret;
75 }
76
77 ret = wl1271_cmd_ps_mode(wl, wlvif, mode, 0);
78 if (ret < 0)
79 return ret;
80
81 clear_bit(WLVIF_FLAG_IN_PS, &wlvif->flags);
82 break;
83 default:
84 wl1271_warning("trying to set ps to unsupported mode %d", mode);
85 ret = -EINVAL;
86 }
87
88 return ret;
89 }
90
wl1271_ps_filter_frames(struct wl1271 * wl,u8 hlid)91 static void wl1271_ps_filter_frames(struct wl1271 *wl, u8 hlid)
92 {
93 int i;
94 struct sk_buff *skb;
95 struct ieee80211_tx_info *info;
96 unsigned long flags;
97 int filtered[NUM_TX_QUEUES];
98 struct wl1271_link *lnk = &wl->links[hlid];
99
100 /* filter all frames currently in the low level queues for this hlid */
101 for (i = 0; i < NUM_TX_QUEUES; i++) {
102 filtered[i] = 0;
103 while ((skb = skb_dequeue(&lnk->tx_queue[i]))) {
104 filtered[i]++;
105
106 if (WARN_ON(wl12xx_is_dummy_packet(wl, skb)))
107 continue;
108
109 info = IEEE80211_SKB_CB(skb);
110 info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
111 info->status.rates[0].idx = -1;
112 ieee80211_tx_status_ni(wl->hw, skb);
113 }
114 }
115
116 spin_lock_irqsave(&wl->wl_lock, flags);
117 for (i = 0; i < NUM_TX_QUEUES; i++) {
118 wl->tx_queue_count[i] -= filtered[i];
119 if (lnk->wlvif)
120 lnk->wlvif->tx_queue_count[i] -= filtered[i];
121 }
122 spin_unlock_irqrestore(&wl->wl_lock, flags);
123
124 wl1271_handle_tx_low_watermark(wl);
125 }
126
wl12xx_ps_link_start(struct wl1271 * wl,struct wl12xx_vif * wlvif,u8 hlid,bool clean_queues)127 void wl12xx_ps_link_start(struct wl1271 *wl, struct wl12xx_vif *wlvif,
128 u8 hlid, bool clean_queues)
129 {
130 struct ieee80211_sta *sta;
131 struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif);
132
133 if (WARN_ON_ONCE(wlvif->bss_type != BSS_TYPE_AP_BSS))
134 return;
135
136 if (!test_bit(hlid, wlvif->ap.sta_hlid_map) ||
137 test_bit(hlid, &wl->ap_ps_map))
138 return;
139
140 wl1271_debug(DEBUG_PSM, "start mac80211 PSM on hlid %d pkts %d "
141 "clean_queues %d", hlid, wl->links[hlid].allocated_pkts,
142 clean_queues);
143
144 rcu_read_lock();
145 sta = ieee80211_find_sta(vif, wl->links[hlid].addr);
146 if (!sta) {
147 wl1271_error("could not find sta %pM for starting ps",
148 wl->links[hlid].addr);
149 rcu_read_unlock();
150 return;
151 }
152
153 ieee80211_sta_ps_transition_ni(sta, true);
154 rcu_read_unlock();
155
156 /* do we want to filter all frames from this link's queues? */
157 if (clean_queues)
158 wl1271_ps_filter_frames(wl, hlid);
159
160 __set_bit(hlid, &wl->ap_ps_map);
161 }
162
wl12xx_ps_link_end(struct wl1271 * wl,struct wl12xx_vif * wlvif,u8 hlid)163 void wl12xx_ps_link_end(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 hlid)
164 {
165 struct ieee80211_sta *sta;
166 struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif);
167
168 if (!test_bit(hlid, &wl->ap_ps_map))
169 return;
170
171 wl1271_debug(DEBUG_PSM, "end mac80211 PSM on hlid %d", hlid);
172
173 __clear_bit(hlid, &wl->ap_ps_map);
174
175 rcu_read_lock();
176 sta = ieee80211_find_sta(vif, wl->links[hlid].addr);
177 if (!sta) {
178 wl1271_error("could not find sta %pM for ending ps",
179 wl->links[hlid].addr);
180 goto end;
181 }
182
183 ieee80211_sta_ps_transition_ni(sta, false);
184 end:
185 rcu_read_unlock();
186 }
187
