__set_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags);
__set_bit(DRIVER_REQUIRE_COPY_IV, &rt2x00dev->flags);
}
+ __set_bit(DRIVER_SUPPORT_WATCHDOG, &rt2x00dev->flags);
/*
* Set the rssi offset.
.rfkill_poll = rt2500usb_rfkill_poll,
.link_stats = rt2500usb_link_stats,
.reset_tuner = rt2500usb_reset_tuner,
+ .watchdog = rt2x00usb_watchdog,
.write_tx_desc = rt2500usb_write_tx_desc,
.write_beacon = rt2500usb_write_beacon,
.get_tx_data_len = rt2500usb_get_tx_data_len,
if (!modparam_nohwcrypt)
__set_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags);
__set_bit(DRIVER_SUPPORT_LINK_TUNING, &rt2x00dev->flags);
+ __set_bit(DRIVER_SUPPORT_WATCHDOG, &rt2x00dev->flags);
/*
* Set the rssi offset.
.link_stats = rt2800_link_stats,
.reset_tuner = rt2800_reset_tuner,
.link_tuner = rt2800_link_tuner,
+ .watchdog = rt2x00usb_watchdog,
.write_tx_desc = rt2800usb_write_tx_desc,
.write_tx_data = rt2800usb_write_tx_data,
.write_beacon = rt2800_write_beacon,
* Work structure for scheduling periodic link tuning.
*/
struct delayed_work work;
+
+ /*
+ * Work structure for scheduling periodic watchdog monitoring.
+ */
+ struct delayed_work watchdog_work;
};
/*
struct link_qual *qual);
void (*link_tuner) (struct rt2x00_dev *rt2x00dev,
struct link_qual *qual, const u32 count);
+ void (*watchdog) (struct rt2x00_dev *rt2x00dev);
/*
* TX control handlers
DRIVER_SUPPORT_CONTROL_FILTERS,
DRIVER_SUPPORT_CONTROL_FILTER_PSPOLL,
DRIVER_SUPPORT_LINK_TUNING,
+ DRIVER_SUPPORT_WATCHDOG,
/*
* Driver configuration
rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
/*
+ * Start watchdog monitoring.
+ */
+ rt2x00link_start_watchdog(rt2x00dev);
+
+ /*
* Start the TX queues.
*/
ieee80211_wake_queues(rt2x00dev->hw);
rt2x00queue_stop_queues(rt2x00dev);
/*
+ * Stop watchdog monitoring.
+ */
+ rt2x00link_stop_watchdog(rt2x00dev);
+
+ /*
* Disable RX.
*/
rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
/*
* Interval defines
*/
+#define WATCHDOG_INTERVAL round_jiffies_relative(HZ)
#define LINK_TUNE_INTERVAL round_jiffies_relative(HZ)
/*
void rt2x00link_reset_tuner(struct rt2x00_dev *rt2x00dev, bool antenna);
/**
- * rt2x00link_register - Initialize link tuning functionality
+ * rt2x00link_start_watchdog - Start periodic watchdog monitoring
* @rt2x00dev: Pointer to &struct rt2x00_dev.
*
- * Initialize work structure and all link tuning related
- * parameters. This will not start the link tuning process itself.
+ * This start the watchdog periodic work, this work will
+ *be executed periodically until &rt2x00link_stop_watchdog has
+ * been called.
+ */
+void rt2x00link_start_watchdog(struct rt2x00_dev *rt2x00dev);
+
+/**
+ * rt2x00link_stop_watchdog - Stop periodic watchdog monitoring
+ * @rt2x00dev: Pointer to &struct rt2x00_dev.
+ *
+ * After this function completed the watchdog monitoring will not
+ * be running until &rt2x00link_start_watchdog is called.
+ */
+void rt2x00link_stop_watchdog(struct rt2x00_dev *rt2x00dev);
+
+/**
+ * rt2x00link_register - Initialize link tuning & watchdog functionality
+ * @rt2x00dev: Pointer to &struct rt2x00_dev.
+ *
+ * Initialize work structure and all link tuning and watchdog related
+ * parameters. This will not start the periodic work itself.
*/
void rt2x00link_register(struct rt2x00_dev *rt2x00dev);
&link->work, LINK_TUNE_INTERVAL);
}
+void rt2x00link_start_watchdog(struct rt2x00_dev *rt2x00dev)
+{
+ struct link *link = &rt2x00dev->link;
+
+ if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
+ !test_bit(DRIVER_SUPPORT_WATCHDOG, &rt2x00dev->flags))
+ return;
+
+ ieee80211_queue_delayed_work(rt2x00dev->hw,
+ &link->watchdog_work, WATCHDOG_INTERVAL);
+}
+
+void rt2x00link_stop_watchdog(struct rt2x00_dev *rt2x00dev)
+{
+ cancel_delayed_work_sync(&rt2x00dev->link.watchdog_work);
+}
+
+static void rt2x00link_watchdog(struct work_struct *work)
+{
+ struct rt2x00_dev *rt2x00dev =
+ container_of(work, struct rt2x00_dev, link.watchdog_work.work);
+ struct link *link = &rt2x00dev->link;
+
+ /*
+ * When the radio is shutting down we should
+ * immediately cease the watchdog monitoring.
+ */
+ if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
+ return;
+
+ rt2x00dev->ops->lib->watchdog(rt2x00dev);
+
+ if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
+ ieee80211_queue_delayed_work(rt2x00dev->hw,
+ &link->watchdog_work, WATCHDOG_INTERVAL);
+}
+
void rt2x00link_register(struct rt2x00_dev *rt2x00dev)
{
+ INIT_DELAYED_WORK(&rt2x00dev->link.watchdog_work, rt2x00link_watchdog);
INIT_DELAYED_WORK(&rt2x00dev->link.work, rt2x00link_tuner);
}
if (index == Q_INDEX) {
queue->length++;
+ queue->last_index = jiffies;
} else if (index == Q_INDEX_DONE) {
queue->length--;
queue->count++;
+ queue->last_index_done = jiffies;
}
spin_unlock_irqrestore(&queue->lock, irqflags);
queue->count = 0;
queue->length = 0;
+ queue->last_index = jiffies;
+ queue->last_index_done = jiffies;
memset(queue->index, 0, sizeof(queue->index));
spin_unlock_irqrestore(&queue->lock, irqflags);
enum data_queue_qid qid;
spinlock_t lock;
+ unsigned long last_index;
+ unsigned long last_index_done;
unsigned int count;
unsigned short limit;
unsigned short threshold;
}
/**
+ * rt2x00queue_timeout - Check if a timeout occured for this queue
+ * @queue: Queue to check.
+ */
+static inline int rt2x00queue_timeout(struct data_queue *queue)
+{
+ return time_after(queue->last_index, queue->last_index_done + (HZ / 10));
+}
+
+/**
* _rt2x00_desc_read - Read a word from the hardware descriptor.
* @desc: Base descriptor address
* @word: Word index from where the descriptor should be read.
}
EXPORT_SYMBOL_GPL(rt2x00usb_kill_tx_queue);
+static void rt2x00usb_watchdog_reset_tx(struct data_queue *queue)
+{
+ struct queue_entry_priv_usb *entry_priv;
+ unsigned short threshold = queue->threshold;
+
+ WARNING(queue->rt2x00dev, "TX queue %d timed out, invoke reset", queue->qid);
+
+ /*
+ * Temporarily disable the TX queue, this will force mac80211
+ * to use the other queues until this queue has been restored.
+ *
+ * Set the queue threshold to the queue limit. This prevents the
+ * queue from being enabled during the txdone handler.
+ */
+ queue->threshold = queue->limit;
+ ieee80211_stop_queue(queue->rt2x00dev->hw, queue->qid);
+
+ /*
+ * Reset all currently uploaded TX frames.
+ */
+ while (!rt2x00queue_empty(queue)) {
+ entry_priv = rt2x00queue_get_entry(queue, Q_INDEX_DONE)->priv_data;
+ usb_kill_urb(entry_priv->urb);
+
+ /*
+ * We need a short delay here to wait for
+ * the URB to be canceled and invoked the tx_done handler.
+ */
+ udelay(200);
+ }
+
+ /*
+ * The queue has been reset, and mac80211 is allowed to use the
+ * queue again.
+ */
+ queue->threshold = threshold;
+ ieee80211_wake_queue(queue->rt2x00dev->hw, queue->qid);
+}
+
+void rt2x00usb_watchdog(struct rt2x00_dev *rt2x00dev)
+{
+ struct data_queue *queue;
+
+ tx_queue_for_each(rt2x00dev, queue) {
+ if (rt2x00queue_timeout(queue))
+ rt2x00usb_watchdog_reset_tx(queue);
+ }
+}
+EXPORT_SYMBOL_GPL(rt2x00usb_watchdog);
+
/*
* RX data handlers.
*/
void rt2x00usb_kill_tx_queue(struct rt2x00_dev *rt2x00dev,
const enum data_queue_qid qid);
+/**
+ * rt2x00usb_watchdog - Watchdog for USB communication
+ * @rt2x00dev: Pointer to &struct rt2x00_dev
+ *
+ * Check the health of the USB communication and determine
+ * if timeouts have occured. If this is the case, this function
+ * will reset all communication to restore functionality again.
+ */
+void rt2x00usb_watchdog(struct rt2x00_dev *rt2x00dev);
+
/*
* Device initialization handlers.
*/
if (!modparam_nohwcrypt)
__set_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags);
__set_bit(DRIVER_SUPPORT_LINK_TUNING, &rt2x00dev->flags);
+ __set_bit(DRIVER_SUPPORT_WATCHDOG, &rt2x00dev->flags);
/*
* Set the rssi offset.
.link_stats = rt73usb_link_stats,
.reset_tuner = rt73usb_reset_tuner,
.link_tuner = rt73usb_link_tuner,
+ .watchdog = rt2x00usb_watchdog,
.write_tx_desc = rt73usb_write_tx_desc,
.write_beacon = rt73usb_write_beacon,
.get_tx_data_len = rt73usb_get_tx_data_len,
projects / platform / kernel / linux-rpi.git / commitdiff