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Commit 589983cd authored by Patrick McHardy's avatar Patrick McHardy Committed by David S. Miller
Browse files

net_sched: move dev_graft_qdisc() to sch_generic.c 



It will be used in a following patch by the multiqueue qdisc.

Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent af356afa

include/net/sch_generic.h

+2 −0
Original line number Diff line number Diff line
@@ -302,6 +302,8 @@ extern void dev_init_scheduler(struct net_device *dev); 
extern void dev_shutdown(struct net_device *dev);

extern void dev_activate(struct net_device *dev);

extern void dev_deactivate(struct net_device *dev);

extern struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,

				     struct Qdisc *qdisc);

extern void qdisc_reset(struct Qdisc *qdisc);

extern void qdisc_destroy(struct Qdisc *qdisc);

extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);

net/sched/sch_api.c

+0 −26
Original line number Diff line number Diff line
@@ -610,32 +610,6 @@ static u32 qdisc_alloc_handle(struct net_device *dev) 
	return i>0 ? autohandle : 0;

}



/* Attach toplevel qdisc to device queue. */



static struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,

				     struct Qdisc *qdisc)

{

	struct Qdisc *oqdisc = dev_queue->qdisc_sleeping;

	spinlock_t *root_lock;



	root_lock = qdisc_lock(oqdisc);

	spin_lock_bh(root_lock);



	/* Prune old scheduler */

	if (oqdisc && atomic_read(&oqdisc->refcnt) <= 1)

		qdisc_reset(oqdisc);



	/* ... and graft new one */

	if (qdisc == NULL)

		qdisc = &noop_qdisc;

	dev_queue->qdisc_sleeping = qdisc;

	rcu_assign_pointer(dev_queue->qdisc, &noop_qdisc);



	spin_unlock_bh(root_lock);



	return oqdisc;

}



void qdisc_tree_decrease_qlen(struct Qdisc *sch, unsigned int n)

{

	const struct Qdisc_class_ops *cops;

net/sched/sch_generic.c

+25 −0
Original line number Diff line number Diff line
@@ -623,6 +623,31 @@ void qdisc_destroy(struct Qdisc *qdisc) 
}

EXPORT_SYMBOL(qdisc_destroy);



/* Attach toplevel qdisc to device queue. */

struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,

			      struct Qdisc *qdisc)

{

	struct Qdisc *oqdisc = dev_queue->qdisc_sleeping;

	spinlock_t *root_lock;



	root_lock = qdisc_lock(oqdisc);

	spin_lock_bh(root_lock);



	/* Prune old scheduler */

	if (oqdisc && atomic_read(&oqdisc->refcnt) <= 1)

		qdisc_reset(oqdisc);



	/* ... and graft new one */

	if (qdisc == NULL)

		qdisc = &noop_qdisc;

	dev_queue->qdisc_sleeping = qdisc;

	rcu_assign_pointer(dev_queue->qdisc, &noop_qdisc);



	spin_unlock_bh(root_lock);



	return oqdisc;

}



static void attach_one_default_qdisc(struct net_device *dev,

				     struct netdev_queue *dev_queue,

				     void *_unused)