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net: sched: extend Qdisc with rcu

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Currently, Qdisc API functions assume that users have rtnl lock taken. To
implement rtnl unlocked classifiers update interface, Qdisc API must be
extended with functions that do not require rtnl lock.

Extend Qdisc structure with rcu. Implement special version of put function
qdisc_put_unlocked() that is called without rtnl lock taken. This function
only takes rtnl lock if Qdisc reference counter reached zero and is
intended to be used as optimization.

Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vlad Buslov 2018-09-24 19:22:51 +03:00 • committed by David S. Miller
parent 86bd446b5c
commit 3a7d0d07a3
5 changed files with 50 additions and 1 deletions
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18
net/sched/sch_api.c
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@ -314,6 +314,24 @@ out:
return q;
}
struct Qdisc *qdisc_lookup_rcu(struct net_device *dev, u32 handle)
{
struct netdev_queue *nq;
struct Qdisc *q;
if (!handle)
return NULL;
q = qdisc_match_from_root(dev->qdisc, handle);
if (q)
goto out;
nq = dev_ingress_queue_rcu(dev);
if (nq)
q = qdisc_match_from_root(nq->qdisc_sleeping, handle);
out:
return q;
}
static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid)
{
unsigned long cl;