net_sched: convert tcf_exts from list to pointer array
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: a85a970af265 ("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>
diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index b4c7be3..d09d068 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -420,18 +420,19 @@
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)
diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index 843a716..a7c5645 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -541,8 +541,12 @@
void tcf_exts_destroy(struct tcf_exts *exts)
{
#ifdef CONFIG_NET_CLS_ACT
- tcf_action_destroy(&exts->actions, TCA_ACT_UNBIND);
- INIT_LIST_HEAD(&exts->actions);
+ LIST_HEAD(actions);
+
+ tcf_exts_to_list(exts, &actions);
+ tcf_action_destroy(&actions, TCA_ACT_UNBIND);
+ kfree(exts->actions);
+ exts->nr_actions = 0;
#endif
}
EXPORT_SYMBOL(tcf_exts_destroy);
@@ -554,7 +558,6 @@
{
struct tc_action *act;
- INIT_LIST_HEAD(&exts->actions);
if (exts->police && tb[exts->police]) {
act = tcf_action_init_1(net, tb[exts->police], rate_tlv,
"police", ovr,
@@ -563,14 +566,20 @@
return PTR_ERR(act);
act->type = exts->type = TCA_OLD_COMPAT;
- list_add(&act->list, &exts->actions);
+ exts->actions[0] = act;
+ exts->nr_actions = 1;
} else if (exts->action && tb[exts->action]) {
- int err;
+ LIST_HEAD(actions);
+ int err, i = 0;
+
err = tcf_action_init(net, tb[exts->action], rate_tlv,
NULL, ovr,
- TCA_ACT_BIND, &exts->actions);
+ TCA_ACT_BIND, &actions);
if (err)
return err;
+ list_for_each_entry(act, &actions, list)
+ exts->actions[i++] = act;
+ exts->nr_actions = i;
}
}
#else
@@ -587,37 +596,49 @@
struct tcf_exts *src)
{
#ifdef CONFIG_NET_CLS_ACT
- LIST_HEAD(tmp);
+ struct tcf_exts old = *dst;
+
tcf_tree_lock(tp);
- list_splice_init(&dst->actions, &tmp);
- list_splice(&src->actions, &dst->actions);
+ dst->nr_actions = src->nr_actions;
+ dst->actions = src->actions;
dst->type = src->type;
tcf_tree_unlock(tp);
- tcf_action_destroy(&tmp, TCA_ACT_UNBIND);
+
+ tcf_exts_destroy(&old);
#endif
}
EXPORT_SYMBOL(tcf_exts_change);
-#define tcf_exts_first_act(ext) \
- list_first_entry_or_null(&(exts)->actions, \
- struct tc_action, list)
+#ifdef CONFIG_NET_CLS_ACT
+static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts)
+{
+ if (exts->nr_actions == 0)
+ return NULL;
+ else
+ return exts->actions[0];
+}
+#endif
int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts)
{
#ifdef CONFIG_NET_CLS_ACT
struct nlattr *nest;
- if (exts->action && !list_empty(&exts->actions)) {
+ if (exts->action && exts->nr_actions) {
/*
* again for backward compatible mode - we want
* to work with both old and new modes of entering
* tc data even if iproute2 was newer - jhs
*/
if (exts->type != TCA_OLD_COMPAT) {
+ LIST_HEAD(actions);
+
nest = nla_nest_start(skb, exts->action);
if (nest == NULL)
goto nla_put_failure;
- if (tcf_action_dump(skb, &exts->actions, 0, 0) < 0)
+
+ tcf_exts_to_list(exts, &actions);
+ if (tcf_action_dump(skb, &actions, 0, 0) < 0)
goto nla_put_failure;
nla_nest_end(skb, nest);
} else if (exts->police) {