drivers/net/wireless/ti/wlcore/ps.c

   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 }