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Commit e2627c8c authored by David S. Miller's avatar David S. Miller
Browse files

pkt_sched: Make QDISC_RUNNING a qdisc state. 



Currently it is associated with a netdev_queue, but when we have
qdisc sharing that no longer makes any sense.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent d3b753db

include/linux/netdevice.h

+0 −1
Original line number Diff line number Diff line
@@ -441,7 +441,6 @@ static inline void napi_synchronize(const struct napi_struct *n) 
enum netdev_queue_state_t

{

	__QUEUE_STATE_XOFF,

	__QUEUE_STATE_QDISC_RUNNING,

};



struct netdev_queue {

include/net/pkt_sched.h

+3 −1
Original line number Diff line number Diff line
@@ -88,8 +88,10 @@ extern void __qdisc_run(struct netdev_queue *txq); 


static inline void qdisc_run(struct netdev_queue *txq)

{

	struct Qdisc *q = txq->qdisc;



	if (!netif_tx_queue_stopped(txq) &&

	    !test_and_set_bit(__QUEUE_STATE_QDISC_RUNNING, &txq->state))

	    !test_and_set_bit(__QDISC_STATE_RUNNING, &q->state))

		__qdisc_run(txq);

}

include/net/sch_generic.h

+6 −0
Original line number Diff line number Diff line
@@ -23,6 +23,11 @@ struct qdisc_rate_table 
	int		refcnt;

};



enum qdisc_state_t

{

	__QDISC_STATE_RUNNING,

};



struct Qdisc

{

	int 			(*enqueue)(struct sk_buff *skb, struct Qdisc *dev);
@@ -36,6 +41,7 @@ struct Qdisc 
	u32			handle;

	u32			parent;

	atomic_t		refcnt;

	unsigned long		state;

	struct sk_buff		*gso_skb;

	struct sk_buff_head	q;

	struct netdev_queue	*dev_queue;

net/sched/sch_generic.c

+10 −8
Original line number Diff line number Diff line
@@ -130,8 +130,8 @@ static inline int handle_dev_cpu_collision(struct sk_buff *skb, 
/*

 * NOTE: Called under queue->lock with locally disabled BH.

 *

 * __QUEUE_STATE_QDISC_RUNNING guarantees only one CPU can process

 * this queue at a time. queue->lock serializes queue accesses for

 * __QDISC_STATE_RUNNING guarantees only one CPU can process

 * this qdisc at a time. queue->lock serializes queue accesses for

 * this queue AND txq->qdisc pointer itself.

 *

 *  netif_tx_lock serializes accesses to device driver.
@@ -146,9 +146,9 @@ static inline int handle_dev_cpu_collision(struct sk_buff *skb, 
 *				>0 - queue is not empty.

 *

 */

static inline int qdisc_restart(struct netdev_queue *txq)

static inline int qdisc_restart(struct netdev_queue *txq,

				struct Qdisc *q)

{

	struct Qdisc *q = txq->qdisc;

	int ret = NETDEV_TX_BUSY;

	struct net_device *dev;

	struct sk_buff *skb;
@@ -168,7 +168,6 @@ static inline int qdisc_restart(struct netdev_queue *txq) 
	HARD_TX_UNLOCK(dev, txq);



	spin_lock(&txq->lock);

	q = txq->qdisc;



	switch (ret) {

	case NETDEV_TX_OK:
@@ -197,8 +196,9 @@ static inline int qdisc_restart(struct netdev_queue *txq) 
void __qdisc_run(struct netdev_queue *txq)

{

	unsigned long start_time = jiffies;

	struct Qdisc *q = txq->qdisc;



	while (qdisc_restart(txq)) {

	while (qdisc_restart(txq, q)) {

		if (netif_tx_queue_stopped(txq))

			break;
@@ -213,7 +213,7 @@ void __qdisc_run(struct netdev_queue *txq) 
		}

	}



	clear_bit(__QUEUE_STATE_QDISC_RUNNING, &txq->state);

	clear_bit(__QDISC_STATE_RUNNING, &q->state);

}



static void dev_watchdog(unsigned long arg)
@@ -666,14 +666,16 @@ static bool some_qdisc_is_running(struct net_device *dev, int lock) 


	for (i = 0; i < dev->num_tx_queues; i++) {

		struct netdev_queue *dev_queue;

		struct Qdisc *q;

		int val;



		dev_queue = netdev_get_tx_queue(dev, i);

		q = dev_queue->qdisc;



		if (lock)

			spin_lock_bh(&dev_queue->lock);



		val = test_bit(__QUEUE_STATE_QDISC_RUNNING, &dev_queue->state);

		val = test_bit(__QDISC_STATE_RUNNING, &q->state);



		if (lock)

			spin_unlock_bh(&dev_queue->lock);