[PATCH net 12/13] net: sched: cls_u32: keep track of knodes count in tc_u_common

[Al Viro]

From: Al Viro <v...@zeniv.linux.org.uk>

allows to simplify u32_delete() considerably

Signed-off-by: Al Viro <v...@zeniv.linux.org.uk>
---
 net/sched/cls_u32.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index f6bb3885598d..86cbe4f5800e 100644
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -97,6 +97,7 @@ struct tc_u_common {
        int                     refcnt;
        struct idr              handle_idr;
        struct hlist_node       hnode;
+       long                    knodes;
 };
 
 static inline unsigned int u32_hash_fold(__be32 key,
@@ -453,6 +454,7 @@ static void u32_delete_key_freepf_work(struct work_struct 
*work)
 
 static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key)
 {
+       struct tc_u_common *tp_c = tp->data;
        struct tc_u_knode __rcu **kp;
        struct tc_u_knode *pkp;
        struct tc_u_hnode *ht = rtnl_dereference(key->ht_up);
@@ -463,6 +465,7 @@ static int u32_delete_key(struct tcf_proto *tp, struct 
tc_u_knode *key)
                     kp = &pkp->next, pkp = rtnl_dereference(*kp)) {
                        if (pkp == key) {
                                RCU_INIT_POINTER(*kp, key->next);
+                               tp_c->knodes--;
 
                                tcf_unbind_filter(tp, &key->res);
                                idr_remove(&ht->handle_idr, key->handle);
@@ -577,6 +580,7 @@ static int u32_replace_hw_knode(struct tcf_proto *tp, 
struct tc_u_knode *n,
 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht,
                            struct netlink_ext_ack *extack)
 {
+       struct tc_u_common *tp_c = tp->data;
        struct tc_u_knode *n;
        unsigned int h;
 
@@ -584,6 +588,7 @@ static void u32_clear_hnode(struct tcf_proto *tp, struct 
tc_u_hnode *ht,
                while ((n = rtnl_dereference(ht->ht[h])) != NULL) {
                        RCU_INIT_POINTER(ht->ht[h],
                                         rtnl_dereference(n->next));
+                       tp_c->knodes--;
                        tcf_unbind_filter(tp, &n->res);
                        u32_remove_hw_knode(tp, n, extack);
                        idr_remove(&ht->handle_idr, n->handle);
@@ -1140,6 +1145,7 @@ static int u32_change(struct net *net, struct sk_buff 
*in_skb,
 
                RCU_INIT_POINTER(n->next, pins);
                rcu_assign_pointer(*ins, n);
+               tp_c->knodes++;
                *arg = n;
                return 0;
        }
-- 
2.11.0