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 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 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 } 126 127 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 } 162 163 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