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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: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2008-07-16 00:56:32 -07:00
parent d3b753db7c
commit e2627c8c22
4 changed files with 19 additions and 10 deletions
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1
include/linux/netdevice.h
View File

@ -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 {

4
include/net/pkt_sched.h
View File

@ -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);
}

6
include/net/sch_generic.h
View File

@ -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;

18
net/sched/sch_generic.c
View File

@ -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);