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net_sched: convert tcf_exts from list to pointer array

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As pointed out by Jamal, an action could be shared by
multiple filters, so we can't use list to chain them
any more after we get rid of the original tc_action.
Instead, we could just save pointers to these actions
in tcf_exts, since they are refcount'ed, so convert
the list to an array of pointers.

The "ugly" part is the action API still accepts list
as a parameter, I just introduce a helper function to
convert the array of pointers to a list, instead of
relying on the C99 feature to iterate the array.

Fixes: a85a970af2 ("net_sched: move tc_action into tcf_common")
Reported-by: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
WANG Cong
2016-08-13 22:35:00 -07:00
committed by David S. Miller
parent 2734437ef3
commit 22dc13c837
7 changed files with 85 additions and 41 deletions
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11
net/sched/act_api.c
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@@ -420,18 +420,19 @@ static struct tc_action_ops *tc_lookup_action(struct nlattr *kind)
return res;
}
int tcf_action_exec(struct sk_buff *skb, const struct list_head *actions,
struct tcf_result *res)
int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
int nr_actions, struct tcf_result *res)
{
const struct tc_action *a;
int ret = -1;
int ret = -1, i;
if (skb->tc_verd & TC_NCLS) {
skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
ret = TC_ACT_OK;
goto exec_done;
}
list_for_each_entry(a, actions, list) {
for (i = 0; i < nr_actions; i++) {
const struct tc_action *a = actions[i];
repeat:
ret = a->ops->act(skb, a, res);
if (ret == TC_ACT_REPEAT)