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net: sched: implement action API that deletes action by index

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Implement new action API function that atomically finds and deletes action
from idr by index. Intended to be used by lockless actions that do not rely
on rtnl lock.

Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vlad Buslov 2018-07-05 17:24:27 +03:00 committed by David S. Miller
parent 3f7c72bc42
commit 2a2ea34970
2 changed files with 40 additions and 0 deletions
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1
include/net/act_api.h
View File

@ -153,6 +153,7 @@ int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
int bind, bool cpustats);
void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a);
int tcf_idr_delete_index(struct tc_action_net *tn, u32 index);
int __tcf_idr_release(struct tc_action *a, bool bind, bool strict);
static inline int tcf_idr_release(struct tc_action *a, bool bind)

39
net/sched/act_api.c
View File

@ -319,6 +319,45 @@ bool tcf_idr_check(struct tc_action_net *tn, u32 index, struct tc_action **a,
}
EXPORT_SYMBOL(tcf_idr_check);
int tcf_idr_delete_index(struct tc_action_net *tn, u32 index)
{
struct tcf_idrinfo *idrinfo = tn->idrinfo;
struct tc_action *p;
int ret = 0;
spin_lock(&idrinfo->lock);
p = idr_find(&idrinfo->action_idr, index);
if (!p) {
spin_unlock(&idrinfo->lock);
return -ENOENT;
}
if (!atomic_read(&p->tcfa_bindcnt)) {
if (refcount_dec_and_test(&p->tcfa_refcnt)) {
struct module *owner = p->ops->owner;
WARN_ON(p != idr_remove(&idrinfo->action_idr,
p->tcfa_index));
spin_unlock(&idrinfo->lock);
if (p->ops->cleanup)
p->ops->cleanup(p);
gen_kill_estimator(&p->tcfa_rate_est);
free_tcf(p);
module_put(owner);
return 0;
}
ret = 0;
} else {
ret = -EPERM;
}
spin_unlock(&idrinfo->lock);
return ret;
}
EXPORT_SYMBOL(tcf_idr_delete_index);
int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
struct tc_action **a, const struct tc_action_ops *ops,
int bind, bool cpustats)