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| author |   Vlad Buslov <vladbu@mellanox.com> | 2018-09-24 19:22:51 +0300 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2018-09-25 20:17:35 -0700 |
| commit | 3a7d0d07a386716b459b00783b11a8211cefcc0f (patch) | |
| tree | 4d1cf3e61e9262e1bb3436e6c24735753e19d00a /include/net/sch_generic.h | |
| parent | net: sched: rename qdisc_destroy() to qdisc_put() (diff) | |
| download | linux-dev-3a7d0d07a386716b459b00783b11a8211cefcc0f.tar.xz linux-dev-3a7d0d07a386716b459b00783b11a8211cefcc0f.zip | |
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 '')
| -rw-r--r-- | include/net/sch_generic.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h index fadb1a4d4ee8..091b40c198ff 100644 --- a/include/net/sch_generic.h +++ b/include/net/sch_generic.h @@ -105,6 +105,7 @@ struct Qdisc { spinlock_t busylock ____cacheline_aligned_in_smp; spinlock_t seqlock; + struct rcu_head rcu; }; static inline void qdisc_refcount_inc(struct Qdisc *qdisc) @@ -555,6 +556,7 @@ struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, struct Qdisc *qdisc); void qdisc_reset(struct Qdisc *qdisc); void qdisc_put(struct Qdisc *qdisc); +void qdisc_put_unlocked(struct Qdisc *qdisc); void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n, unsigned int len); struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, |