mac80211: add basic support for WoWLAN
This adds basic support for the new WoWLAN
configuration in mac80211. The behaviour is
completely offloaded to the driver though,
with two new callbacks (suspend/resume).
Options for the driver include a complete
reconfiguration after wakeup, and exposing
all the triggers it wants to support.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 321d598..1ebc133 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -1300,7 +1300,7 @@
static int ieee80211_suspend(struct wiphy *wiphy,
struct cfg80211_wowlan *wowlan)
{
- return __ieee80211_suspend(wiphy_priv(wiphy));
+ return __ieee80211_suspend(wiphy_priv(wiphy), wowlan);
}
static int ieee80211_resume(struct wiphy *wiphy)
diff --git a/net/mac80211/debugfs.c b/net/mac80211/debugfs.c
index 0a602db..186e02f 100644
--- a/net/mac80211/debugfs.c
+++ b/net/mac80211/debugfs.c
@@ -135,7 +135,7 @@
struct ieee80211_local *local = file->private_data;
rtnl_lock();
- __ieee80211_suspend(&local->hw);
+ __ieee80211_suspend(&local->hw, NULL);
__ieee80211_resume(&local->hw);
rtnl_unlock();
diff --git a/net/mac80211/driver-ops.h b/net/mac80211/driver-ops.h
index 2ddb56e..aa16bd8 100644
--- a/net/mac80211/driver-ops.h
+++ b/net/mac80211/driver-ops.h
@@ -41,6 +41,33 @@
local->started = false;
}
+#ifdef CONFIG_PM
+static inline int drv_suspend(struct ieee80211_local *local,
+ struct cfg80211_wowlan *wowlan)
+{
+ int ret;
+
+ might_sleep();
+
+ trace_drv_suspend(local);
+ ret = local->ops->suspend(&local->hw, wowlan);
+ trace_drv_return_int(local, ret);
+ return ret;
+}
+
+static inline int drv_resume(struct ieee80211_local *local)
+{
+ int ret;
+
+ might_sleep();
+
+ trace_drv_resume(local);
+ ret = local->ops->resume(&local->hw);
+ trace_drv_return_int(local, ret);
+ return ret;
+}
+#endif
+
static inline int drv_add_interface(struct ieee80211_local *local,
struct ieee80211_vif *vif)
{
diff --git a/net/mac80211/driver-trace.h b/net/mac80211/driver-trace.h
index 191e834..11e1ea5 100644
--- a/net/mac80211/driver-trace.h
+++ b/net/mac80211/driver-trace.h
@@ -108,6 +108,16 @@
TP_ARGS(local)
);
+DEFINE_EVENT(local_only_evt, drv_suspend,
+ TP_PROTO(struct ieee80211_local *local),
+ TP_ARGS(local)
+);
+
+DEFINE_EVENT(local_only_evt, drv_resume,
+ TP_PROTO(struct ieee80211_local *local),
+ TP_ARGS(local)
+);
+
DEFINE_EVENT(local_only_evt, drv_stop,
TP_PROTO(struct ieee80211_local *local),
TP_ARGS(local)
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 9e3b4f0..e89bc27 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -764,6 +764,9 @@
/* device is started */
bool started;
+ /* wowlan is enabled -- don't reconfig on resume */
+ bool wowlan;
+
int tx_headroom; /* required headroom for hardware/radiotap */
/* count for keys needing tailroom space allocation */
@@ -1250,7 +1253,8 @@
void ieee80211_stop_device(struct ieee80211_local *local);
#ifdef CONFIG_PM
-int __ieee80211_suspend(struct ieee80211_hw *hw);
+int __ieee80211_suspend(struct ieee80211_hw *hw,
+ struct cfg80211_wowlan *wowlan);
static inline int __ieee80211_resume(struct ieee80211_hw *hw)
{
@@ -1263,7 +1267,8 @@
return ieee80211_reconfig(hw_to_local(hw));
}
#else
-static inline int __ieee80211_suspend(struct ieee80211_hw *hw)
+static inline int __ieee80211_suspend(struct ieee80211_hw *hw,
+ struct cfg80211_wowlan *wowlan)
{
return 0;
}
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index d8be198..cb326d3 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -696,6 +696,10 @@
WLAN_CIPHER_SUITE_AES_CMAC
};
+ if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns) &&
+ (!local->ops->suspend || !local->ops->resume))
+ return -EINVAL;
+
if (hw->max_report_rates == 0)
hw->max_report_rates = hw->max_rates;
diff --git a/net/mac80211/pm.c b/net/mac80211/pm.c
index 0424617..730778a 100644
--- a/net/mac80211/pm.c
+++ b/net/mac80211/pm.c
@@ -6,7 +6,7 @@
#include "driver-ops.h"
#include "led.h"
-int __ieee80211_suspend(struct ieee80211_hw *hw)
+int __ieee80211_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan)
{
struct ieee80211_local *local = hw_to_local(hw);
struct ieee80211_sub_if_data *sdata;
@@ -47,6 +47,16 @@
cancel_work_sync(&local->dynamic_ps_enable_work);
del_timer_sync(&local->dynamic_ps_timer);
+ local->wowlan = wowlan && local->open_count;
+ if (local->wowlan) {
+ int err = drv_suspend(local, wowlan);
+ if (err) {
+ local->quiescing = false;
+ return err;
+ }
+ goto suspend;
+ }
+
/* disable keys */
list_for_each_entry(sdata, &local->interfaces, list)
ieee80211_disable_keys(sdata);
@@ -104,6 +114,7 @@
if (local->open_count)
ieee80211_stop_device(local);
+ suspend:
local->suspended = true;
/* need suspended to be visible before quiescing is false */
barrier();
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index ef0560a..d3fe2d2 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -1125,9 +1125,27 @@
struct sta_info *sta;
int res;
+#ifdef CONFIG_PM
if (local->suspended)
local->resuming = true;
+ if (local->wowlan) {
+ local->wowlan = false;
+ res = drv_resume(local);
+ if (res < 0) {
+ local->resuming = false;
+ return res;
+ }
+ if (res == 0)
+ goto wake_up;
+ WARN_ON(res > 1);
+ /*
+ * res is 1, which means the driver requested
+ * to go through a regular reset on wakeup.
+ */
+ }
+#endif
+
/* restart hardware */
if (local->open_count) {
/*
@@ -1258,6 +1276,7 @@
if (ieee80211_sdata_running(sdata))
ieee80211_enable_keys(sdata);
+ wake_up:
ieee80211_wake_queues_by_reason(hw,
IEEE80211_QUEUE_STOP_REASON_SUSPEND);