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net/sched: act_api: skip idr replace on bound actions 

tcf_idr_insert_many will replace the allocated -EBUSY pointer in
tcf_idr_check_alloc with the real action pointer, exposing it
to all operations. This operation is only needed when the action pointer
is created (ACT_P_CREATED). For actions which are bound to (returned 0),
the pointer already resides in the idr making such operation a nop.

Even though it's a nop, it's still not a cheap operation as internally
the idr code walks the idr and then does a replace on the appropriate slot.
So if the action was bound, better skip the idr replace entirely.

Signed-off-by: Pedro Tammela <pctammela@mojatatu.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Reviewed-by: Vlad Buslov <vladbu@nvidia.com>
Link: https://lore.kernel.org/r/20231211181807.96028-3-pctammela@mojatatu.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Pedro Tammela 2023-12-11 15:18:07 -03:00 committed by Jakub Kicinski
parent 4b55e86736
commit 1dd7f18fc0
3 changed files with 8 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/act_api.h
View File

@ -191,7 +191,7 @@ int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index,
struct nlattr *est, struct tc_action **a,
const struct tc_action_ops *ops, int bind,
u32 flags);
void tcf_idr_insert_many(struct tc_action *actions[]);
void tcf_idr_insert_many(struct tc_action *actions[], int init_res[]);
void tcf_idr_cleanup(struct tc_action_net *tn, u32 index);
int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
struct tc_action **a, int bind);

11
net/sched/act_api.c
View File

@ -1304,7 +1304,7 @@ static const struct nla_policy tcf_action_policy[TCA_ACT_MAX + 1] = {
[TCA_ACT_HW_STATS] = NLA_POLICY_BITFIELD32(TCA_ACT_HW_STATS_ANY),
};
void tcf_idr_insert_many(struct tc_action *actions[])
void tcf_idr_insert_many(struct tc_action *actions[], int init_res[])
{
struct tc_action *a;
int i;
@ -1312,11 +1312,12 @@ void tcf_idr_insert_many(struct tc_action *actions[])
tcf_act_for_each_action(i, a, actions) {
struct tcf_idrinfo *idrinfo;
if (init_res[i] == 0) /* Bound */
continue;
idrinfo = a->idrinfo;
mutex_lock(&idrinfo->lock);
/* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc if
* it is just created, otherwise this is just a nop.
*/
/* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc */
idr_replace(&idrinfo->action_idr, a, a->tcfa_index);
mutex_unlock(&idrinfo->lock);
}
@ -1516,7 +1517,7 @@ int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
/* We have to commit them all together, because if any error happened in
* between, we could not handle the failure gracefully.
*/
tcf_idr_insert_many(actions);
tcf_idr_insert_many(actions, init_res);
*attr_size = tcf_action_full_attrs_size(sz);
err = i - 1;

2
net/sched/cls_api.c
View File

@ -3313,7 +3313,7 @@ int tcf_exts_validate_ex(struct net *net, struct tcf_proto *tp, struct nlattr **
act->type = exts->type = TCA_OLD_COMPAT;
exts->actions[0] = act;
exts->nr_actions = 1;
tcf_idr_insert_many(exts->actions);
tcf_idr_insert_many(exts->actions, init_res);
} else if (exts->action && tb[exts->action]) {
int err;