net_sched: act: use standard struct list_head
Currently actions are chained by a singly linked list,
therefore it is a bit hard to add and remove a specific
entry. Convert it to struct list_head so that in the
latter patch we can remove an action without finding
its head.
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-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 51e28f7..7d84183 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -379,7 +379,7 @@
}
#endif
-int tcf_action_exec(struct sk_buff *skb, const struct tc_action *act,
+int tcf_action_exec(struct sk_buff *skb, const struct list_head *actions,
struct tcf_result *res)
{
const struct tc_action *a;
@@ -390,7 +390,7 @@
ret = TC_ACT_OK;
goto exec_done;
}
- while ((a = act) != NULL) {
+ list_for_each_entry(a, actions, list) {
repeat:
if (a->ops) {
ret = a->ops->act(skb, a, res);
@@ -404,27 +404,26 @@
if (ret != TC_ACT_PIPE)
goto exec_done;
}
- act = a->next;
}
exec_done:
return ret;
}
EXPORT_SYMBOL(tcf_action_exec);
-void tcf_action_destroy(struct tc_action *act, int bind)
+void tcf_action_destroy(struct list_head *actions, int bind)
{
- struct tc_action *a;
+ struct tc_action *a, *tmp;
- for (a = act; a; a = act) {
+ list_for_each_entry_safe(a, tmp, actions, list) {
if (a->ops) {
if (a->ops->cleanup(a, bind) == ACT_P_DELETED)
module_put(a->ops->owner);
- act = act->next;
+ list_del(&a->list);
kfree(a);
} else {
/*FIXME: Remove later - catch insertion bugs*/
WARN(1, "tcf_action_destroy: BUG? destroying NULL ops\n");
- act = act->next;
+ list_del(&a->list);
kfree(a);
}
}
@@ -470,14 +469,13 @@
EXPORT_SYMBOL(tcf_action_dump_1);
int
-tcf_action_dump(struct sk_buff *skb, struct tc_action *act, int bind, int ref)
+tcf_action_dump(struct sk_buff *skb, struct list_head *actions, int bind, int ref)
{
struct tc_action *a;
int err = -EINVAL;
struct nlattr *nest;
- while ((a = act) != NULL) {
- act = a->next;
+ list_for_each_entry(a, actions, list) {
nest = nla_nest_start(skb, a->order);
if (nest == NULL)
goto nla_put_failure;
@@ -552,6 +550,7 @@
if (a == NULL)
goto err_mod;
+ INIT_LIST_HEAD(&a->list);
/* backward compatibility for policer */
if (name == NULL)
err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, a, ovr, bind);
@@ -578,37 +577,33 @@
return ERR_PTR(err);
}
-struct tc_action *tcf_action_init(struct net *net, struct nlattr *nla,
+int tcf_action_init(struct net *net, struct nlattr *nla,
struct nlattr *est, char *name, int ovr,
- int bind)
+ int bind, struct list_head *actions)
{
struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
- struct tc_action *head = NULL, *act, *act_prev = NULL;
+ struct tc_action *act;
int err;
int i;
err = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
if (err < 0)
- return ERR_PTR(err);
+ return err;
for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
act = tcf_action_init_1(net, tb[i], est, name, ovr, bind);
- if (IS_ERR(act))
+ if (IS_ERR(act)) {
+ err = PTR_ERR(act);
goto err;
+ }
act->order = i;
-
- if (head == NULL)
- head = act;
- else
- act_prev->next = act;
- act_prev = act;
+ list_add_tail(&act->list, actions);
}
- return head;
+ return 0;
err:
- if (head != NULL)
- tcf_action_destroy(head, bind);
- return act;
+ tcf_action_destroy(actions, bind);
+ return err;
}
int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a,
@@ -653,7 +648,7 @@
}
static int
-tca_get_fill(struct sk_buff *skb, struct tc_action *a, u32 portid, u32 seq,
+tca_get_fill(struct sk_buff *skb, struct list_head *actions, u32 portid, u32 seq,
u16 flags, int event, int bind, int ref)
{
struct tcamsg *t;
@@ -673,7 +668,7 @@
if (nest == NULL)
goto out_nlmsg_trim;
- if (tcf_action_dump(skb, a, bind, ref) < 0)
+ if (tcf_action_dump(skb, actions, bind, ref) < 0)
goto out_nlmsg_trim;
nla_nest_end(skb, nest);
@@ -688,14 +683,14 @@
static int
act_get_notify(struct net *net, u32 portid, struct nlmsghdr *n,
- struct tc_action *a, int event)
+ struct list_head *actions, int event)
{
struct sk_buff *skb;
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
if (!skb)
return -ENOBUFS;
- if (tca_get_fill(skb, a, portid, n->nlmsg_seq, 0, event, 0, 0) <= 0) {
+ if (tca_get_fill(skb, actions, portid, n->nlmsg_seq, 0, event, 0, 0) <= 0) {
kfree_skb(skb);
return -EINVAL;
}
@@ -726,6 +721,7 @@
if (a == NULL)
goto err_out;
+ INIT_LIST_HEAD(&a->list);
err = -EINVAL;
a->ops = tc_lookup_action(tb[TCA_ACT_KIND]);
if (a->ops == NULL)
@@ -745,12 +741,12 @@
return ERR_PTR(err);
}
-static void cleanup_a(struct tc_action *act)
+static void cleanup_a(struct list_head *actions)
{
- struct tc_action *a;
+ struct tc_action *a, *tmp;
- for (a = act; a; a = act) {
- act = a->next;
+ list_for_each_entry_safe(a, tmp, actions, list) {
+ list_del(&a->list);
kfree(a);
}
}
@@ -765,6 +761,7 @@
return NULL;
}
act->order = i;
+ INIT_LIST_HEAD(&act->list);
return act;
}
@@ -852,7 +849,8 @@
{
int i, ret;
struct nlattr *tb[TCA_ACT_MAX_PRIO + 1];
- struct tc_action *head = NULL, *act, *act_prev = NULL;
+ struct tc_action *act;
+ LIST_HEAD(actions);
ret = nla_parse_nested(tb, TCA_ACT_MAX_PRIO, nla, NULL);
if (ret < 0)
@@ -872,16 +870,11 @@
goto err;
}
act->order = i;
-
- if (head == NULL)
- head = act;
- else
- act_prev->next = act;
- act_prev = act;
+ list_add_tail(&act->list, &actions);
}
if (event == RTM_GETACTION)
- ret = act_get_notify(net, portid, n, head, event);
+ ret = act_get_notify(net, portid, n, &actions, event);
else { /* delete */
struct sk_buff *skb;
@@ -891,7 +884,7 @@
goto err;
}
- if (tca_get_fill(skb, head, portid, n->nlmsg_seq, 0, event,
+ if (tca_get_fill(skb, &actions, portid, n->nlmsg_seq, 0, event,
0, 1) <= 0) {
kfree_skb(skb);
ret = -EINVAL;
@@ -899,7 +892,7 @@
}
/* now do the delete */
- tcf_action_destroy(head, 0);
+ tcf_action_destroy(&actions, 0);
ret = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
n->nlmsg_flags & NLM_F_ECHO);
if (ret > 0)
@@ -907,11 +900,11 @@
return ret;
}
err:
- cleanup_a(head);
+ cleanup_a(&actions);
return ret;
}
-static int tcf_add_notify(struct net *net, struct tc_action *a,
+static int tcf_add_notify(struct net *net, struct list_head *actions,
u32 portid, u32 seq, int event, u16 flags)
{
struct tcamsg *t;
@@ -939,7 +932,7 @@
if (nest == NULL)
goto out_kfree_skb;
- if (tcf_action_dump(skb, a, 0, 0) < 0)
+ if (tcf_action_dump(skb, actions, 0, 0) < 0)
goto out_kfree_skb;
nla_nest_end(skb, nest);
@@ -963,26 +956,18 @@
u32 portid, int ovr)
{
int ret = 0;
- struct tc_action *act;
- struct tc_action *a;
+ LIST_HEAD(actions);
u32 seq = n->nlmsg_seq;
- act = tcf_action_init(net, nla, NULL, NULL, ovr, 0);
- if (act == NULL)
+ ret = tcf_action_init(net, nla, NULL, NULL, ovr, 0, &actions);
+ if (ret)
goto done;
- if (IS_ERR(act)) {
- ret = PTR_ERR(act);
- goto done;
- }
/* dump then free all the actions after update; inserted policy
* stays intact
*/
- ret = tcf_add_notify(net, act, portid, seq, RTM_NEWACTION, n->nlmsg_flags);
- for (a = act; a; a = act) {
- act = a->next;
- kfree(a);
- }
+ ret = tcf_add_notify(net, &actions, portid, seq, RTM_NEWACTION, n->nlmsg_flags);
+ cleanup_a(&actions);
done:
return ret;
}