diff options
| author | Vlad Buslov <vladbu@mellanox.com> | 2018-09-24 19:22:51 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-09-26 06:17:35 +0300 |
| commit | 3a7d0d07a386716b459b00783b11a8211cefcc0f (patch) | |
| tree | 4d1cf3e61e9262e1bb3436e6c24735753e19d00a /net/sched/sch_api.c | |
| parent | 86bd446b5cebd783187ea3772ff258210de77d99 (diff) | |
| download | linux-3a7d0d07a386716b459b00783b11a8211cefcc0f.tar.xz | |
net: sched: extend Qdisc with rcu
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>
Diffstat (limited to 'net/sched/sch_api.c')
| -rw-r--r-- | net/sched/sch_api.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c index 2096138c4bf6..22e9799e5b69 100644 --- a/net/sched/sch_api.c +++ b/net/sched/sch_api.c @@ -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; |