mac80211: implement dynamic power save

This patch implements dynamic power save for mac80211. Basically it
means enabling power save mode after an idle period. Implementing it
dynamically gives a good compromise of low power consumption and low
latency. Some hardware have support for this in firmware, but some
require the host to do it.

The dynamic power save is implemented by adding an timeout to
ieee80211_subif_start_xmit(). The timeout can be enabled from userspace
with Wireless Extensions. For example, the command below enables the
dynamic power save and sets the time timeout to 500 ms:

iwconfig wlan0 power timeout 500m

Power save now only works with devices which handle power save in firmware.
It's also disabled by default and the heuristics when and how to enable is
considered as a policy decision and will be left for the userspace to handle.
In case the firmware has support for this, drivers can disable this feature
with IEEE80211_HW_NO_STACK_DYNAMIC_PS.

Big thanks to Johannes Berg for the help with the design and code.

Signed-off-by: Kalle Valo <kalle.valo@nokia.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 20 insertions, 10 deletions

diff --git a/net/mac80211/wext.c b/net/mac80211/wext.c
index f6640d047157..7162d5816f39 100644
--- a/net/mac80211/wext.c
+++ b/net/mac80211/wext.c
@@ -833,7 +833,7 @@ static int ieee80211_ioctl_siwpower(struct net_device *dev,
         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
         struct ieee80211_conf *conf = &local->hw.conf;
-        int ret = 0;
+        int ret = 0, timeout = 0;
         bool ps;
 
         if (sdata->vif.type != NL80211_IFTYPE_STATION)
@@ -841,6 +841,7 @@ static int ieee80211_ioctl_siwpower(struct net_device *dev,
 
         if (wrq->disabled) {
                 ps = false;
+                timeout = 0;
                 goto set;
         }
 
@@ -850,22 +851,31 @@ static int ieee80211_ioctl_siwpower(struct net_device *dev,
         case IW_POWER_ALL_R:    /* If explicitely state all */
                 ps = true;
                 break;
-        default:                /* Otherwise we don't support it */
-                return -EINVAL;
+        default:                /* Otherwise we ignore */
+                break;
         }
 
-        if (ps == local->powersave)
-                return ret;
+        if (wrq->flags & IW_POWER_TIMEOUT)
+                timeout = wrq->value / 1000;
 
 set:
+        if (ps == local->powersave && timeout == local->dynamic_ps_timeout)
+                return ret;
+
         local->powersave = ps;
+        local->dynamic_ps_timeout = timeout;
 
         if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) {
-                if (local->powersave)
-                        conf->flags |= IEEE80211_CONF_PS;
-                else
-                        conf->flags &= ~IEEE80211_CONF_PS;
-
+                if (!(local->hw.flags & IEEE80211_HW_NO_STACK_DYNAMIC_PS) &&
+                    local->dynamic_ps_timeout > 0)
+                        mod_timer(&local->dynamic_ps_timer, jiffies +
+                                  msecs_to_jiffies(local->dynamic_ps_timeout));
+                else {
+                        if (local->powersave)
+                                conf->flags |= IEEE80211_CONF_PS;
+                        else
+                                conf->flags &= ~IEEE80211_CONF_PS;
+                }
                 ret = ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
         }