ath9k: Add a simple virtual wiphy scheduler
This is a very simple scheduler that goes through the wiphys and
schedules one at a time every N milliseconds (current default value:
500 ms). This is enough for initial testing, but there are number of
areas where a more complex scheduler can improve operations greatly.
Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath9k/ath9k.h b/drivers/net/wireless/ath9k/ath9k.h
index 983f53d..f0b105a 100644
--- a/drivers/net/wireless/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath9k/ath9k.h
@@ -569,6 +569,9 @@
struct work_struct chan_work;
int wiphy_select_failures;
unsigned long wiphy_select_first_fail;
+ struct delayed_work wiphy_work;
+ unsigned long wiphy_scheduler_int;
+ int wiphy_scheduler_index;
struct tasklet_struct intr_tq;
struct tasklet_struct bcon_tasklet;
@@ -713,10 +716,12 @@
int ath9k_wiphy_pause(struct ath_wiphy *aphy);
int ath9k_wiphy_unpause(struct ath_wiphy *aphy);
int ath9k_wiphy_select(struct ath_wiphy *aphy);
+void ath9k_wiphy_set_scheduler(struct ath_softc *sc, unsigned int msec_int);
void ath9k_wiphy_chan_work(struct work_struct *work);
bool ath9k_wiphy_started(struct ath_softc *sc);
void ath9k_wiphy_pause_all_forced(struct ath_softc *sc,
struct ath_wiphy *selected);
bool ath9k_wiphy_scanning(struct ath_softc *sc);
+void ath9k_wiphy_work(struct work_struct *work);
#endif /* ATH9K_H */
diff --git a/drivers/net/wireless/ath9k/main.c b/drivers/net/wireless/ath9k/main.c
index 6263922..f473fee 100644
--- a/drivers/net/wireless/ath9k/main.c
+++ b/drivers/net/wireless/ath9k/main.c
@@ -1325,6 +1325,7 @@
#endif
ath_deinit_leds(sc);
cancel_work_sync(&sc->chan_work);
+ cancel_delayed_work_sync(&sc->wiphy_work);
for (i = 0; i < sc->num_sec_wiphy; i++) {
struct ath_wiphy *aphy = sc->sec_wiphy[i];
@@ -1672,6 +1673,8 @@
ath9k_reg_apply_world_flags(hw->wiphy, REGDOM_SET_BY_INIT);
INIT_WORK(&sc->chan_work, ath9k_wiphy_chan_work);
+ INIT_DELAYED_WORK(&sc->wiphy_work, ath9k_wiphy_work);
+ sc->wiphy_scheduler_int = msecs_to_jiffies(500);
error = ieee80211_register_hw(hw);
diff --git a/drivers/net/wireless/ath9k/virtual.c b/drivers/net/wireless/ath9k/virtual.c
index 2b54531..1ff429b 100644
--- a/drivers/net/wireless/ath9k/virtual.c
+++ b/drivers/net/wireless/ath9k/virtual.c
@@ -154,6 +154,11 @@
error = ieee80211_register_hw(hw);
+ if (error == 0) {
+ /* Make sure wiphy scheduler is started (if enabled) */
+ ath9k_wiphy_set_scheduler(sc, sc->wiphy_scheduler_int);
+ }
+
return error;
}
@@ -596,3 +601,62 @@
}
spin_unlock_bh(&sc->wiphy_lock);
}
+
+void ath9k_wiphy_work(struct work_struct *work)
+{
+ struct ath_softc *sc = container_of(work, struct ath_softc,
+ wiphy_work.work);
+ struct ath_wiphy *aphy = NULL;
+ bool first = true;
+
+ spin_lock_bh(&sc->wiphy_lock);
+
+ if (sc->wiphy_scheduler_int == 0) {
+ /* wiphy scheduler is disabled */
+ spin_unlock_bh(&sc->wiphy_lock);
+ return;
+ }
+
+try_again:
+ sc->wiphy_scheduler_index++;
+ while (sc->wiphy_scheduler_index <= sc->num_sec_wiphy) {
+ aphy = sc->sec_wiphy[sc->wiphy_scheduler_index - 1];
+ if (aphy && aphy->state != ATH_WIPHY_INACTIVE)
+ break;
+
+ sc->wiphy_scheduler_index++;
+ aphy = NULL;
+ }
+ if (aphy == NULL) {
+ sc->wiphy_scheduler_index = 0;
+ if (sc->pri_wiphy->state == ATH_WIPHY_INACTIVE) {
+ if (first) {
+ first = false;
+ goto try_again;
+ }
+ /* No wiphy is ready to be scheduled */
+ } else
+ aphy = sc->pri_wiphy;
+ }
+
+ spin_unlock_bh(&sc->wiphy_lock);
+
+ if (aphy &&
+ aphy->state != ATH_WIPHY_ACTIVE && aphy->state != ATH_WIPHY_SCAN &&
+ ath9k_wiphy_select(aphy)) {
+ printk(KERN_DEBUG "ath9k: Failed to schedule virtual wiphy "
+ "change\n");
+ }
+
+ queue_delayed_work(sc->hw->workqueue, &sc->wiphy_work,
+ sc->wiphy_scheduler_int);
+}
+
+void ath9k_wiphy_set_scheduler(struct ath_softc *sc, unsigned int msec_int)
+{
+ cancel_delayed_work_sync(&sc->wiphy_work);
+ sc->wiphy_scheduler_int = msecs_to_jiffies(msec_int);
+ if (sc->wiphy_scheduler_int)
+ queue_delayed_work(sc->hw->workqueue, &sc->wiphy_work,
+ sc->wiphy_scheduler_int);
+}