net: sched: introduce reference counting for tcf_proto

In order to remove dependency on rtnl lock and allow concurrent tcf_proto
modification, extend tcf_proto with reference counter. Implement helper
get/put functions for tcf proto and use them to modify cls API to always
take reference to tcf_proto while using it. Only release reference to
parent chain after releasing last reference to tp.

Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/sch_generic.h

@@ -322,6 +322,7 @@ struct tcf_proto {
 	void			*data;
 	const struct tcf_proto_ops	*ops;
 	struct tcf_chain	*chain;
+	refcount_t		refcnt;
 	struct rcu_head		rcu;
 };
 

net/sched/cls_api.c

@@ -180,6 +180,7 @@ static struct tcf_proto *tcf_proto_create(const char *kind, u32 protocol,
 	tp->protocol = protocol;
 	tp->prio = prio;
 	tp->chain = chain;
+	refcount_set(&tp->refcnt, 1);
 
 	err = tp->ops->init(tp);
 	if (err) {
@@ -193,14 +194,29 @@ errout:
 	return ERR_PTR(err);
 }
 
+static void tcf_proto_get(struct tcf_proto *tp)
+{
+	refcount_inc(&tp->refcnt);
+}
+
+static void tcf_chain_put(struct tcf_chain *chain);
+
 static void tcf_proto_destroy(struct tcf_proto *tp,
 			      struct netlink_ext_ack *extack)
 {
 	tp->ops->destroy(tp, extack);
+	tcf_chain_put(tp->chain);
 	module_put(tp->ops->owner);
 	kfree_rcu(tp, rcu);
 }
 
+static void tcf_proto_put(struct tcf_proto *tp,
+			  struct netlink_ext_ack *extack)
+{
+	if (refcount_dec_and_test(&tp->refcnt))
+		tcf_proto_destroy(tp, extack);
+}
+
 #define ASSERT_BLOCK_LOCKED(block)					\
 	lockdep_assert_held(&(block)->lock)
 
@@ -445,18 +461,18 @@ static void tcf_chain_put_explicitly_created(struct tcf_chain *chain)
 
 static void tcf_chain_flush(struct tcf_chain *chain)
 {
-	struct tcf_proto *tp;
+	struct tcf_proto *tp, *tp_next;
 
 	mutex_lock(&chain->filter_chain_lock);
 	tp = tcf_chain_dereference(chain->filter_chain, chain);
+	RCU_INIT_POINTER(chain->filter_chain, NULL);
 	tcf_chain0_head_change(chain, NULL);
 	mutex_unlock(&chain->filter_chain_lock);
 
 	while (tp) {
-		RCU_INIT_POINTER(chain->filter_chain, tp->next);
-		tcf_proto_destroy(tp, NULL);
-		tp = rtnl_dereference(chain->filter_chain);
-		tcf_chain_put(chain);
+		tp_next = rcu_dereference_protected(tp->next, 1);
+		tcf_proto_put(tp, NULL);
+		tp = tp_next;
 	}
 }
 
@@ -1500,9 +1516,9 @@ static void tcf_chain_tp_insert(struct tcf_chain *chain,
 {
 	if (*chain_info->pprev == chain->filter_chain)
 		tcf_chain0_head_change(chain, tp);
+	tcf_proto_get(tp);
 	RCU_INIT_POINTER(tp->next, tcf_chain_tp_prev(chain, chain_info));
 	rcu_assign_pointer(*chain_info->pprev, tp);
-	tcf_chain_hold(chain);
 }
 
 static void tcf_chain_tp_remove(struct tcf_chain *chain,
@@ -1514,7 +1530,6 @@ static void tcf_chain_tp_remove(struct tcf_chain *chain,
 	if (tp == chain->filter_chain)
 		tcf_chain0_head_change(chain, next);
 	RCU_INIT_POINTER(*chain_info->pprev, next);
-	tcf_chain_put(chain);
 }
 
 static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain,
@@ -1541,7 +1556,12 @@ static struct tcf_proto *tcf_chain_tp_find(struct tcf_chain *chain,
 		}
 	}
 	chain_info->pprev = pprev;
-	chain_info->next = tp ? tp->next : NULL;
+	if (tp) {
+		chain_info->next = tp->next;
+		tcf_proto_get(tp);
+	} else {
+		chain_info->next = NULL;
+	}
 	return tp;
 }
 
@@ -1699,6 +1719,7 @@ replay:
 	prio = TC_H_MAJ(t->tcm_info);
 	prio_allocate = false;
 	parent = t->tcm_parent;
+	tp = NULL;
 	cl = 0;
 
 	if (prio == 0) {
@@ -1816,6 +1837,12 @@ replay:
 errout:
 	if (chain)
 		tcf_chain_put(chain);
+	if (chain) {
+		if (tp && !IS_ERR(tp))
+			tcf_proto_put(tp, NULL);
+		if (!tp_created)
+			tcf_chain_put(chain);
+	}
 	tcf_block_release(q, block);
 	if (err == -EAGAIN)
 		/* Replay the request. */
@@ -1946,8 +1973,11 @@ static int tc_del_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
 	}
 
 errout:
-	if (chain)
+	if (chain) {
+		if (tp && !IS_ERR(tp))
+			tcf_proto_put(tp, NULL);
 		tcf_chain_put(chain);
+	}
 	tcf_block_release(q, block);
 	return err;
 
@@ -2038,8 +2068,11 @@ static int tc_get_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
 	}
 
 errout:
-	if (chain)
+	if (chain) {
+		if (tp && !IS_ERR(tp))
+			tcf_proto_put(tp, NULL);
 		tcf_chain_put(chain);
+	}
 	tcf_block_release(q, block);
 	return err;
 }