Merge branch 'net_sched-clean-up-tc-classes-and-u32-filter'

Cong Wang says:

====================
net_sched: clean up tc classes and u32 filter

Patch 1 and patch 2 prepare for patch 3. Major changes
are in patch 3 and patch 4, details are there too.

v2: Add patch 1 and 2, group all into a patchset
    Fix a coding style issue in patch 4
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/sch_generic.h

@@ -75,7 +75,6 @@ struct Qdisc {
 	struct hlist_node       hash;
 	u32			handle;
 	u32			parent;
-	void			*u32_node;
 
 	struct netdev_queue	*dev_queue;
 
@@ -147,8 +146,7 @@ struct Qdisc_class_ops {
 	void			(*qlen_notify)(struct Qdisc *, unsigned long);
 
 	/* Class manipulation routines */
-	unsigned long		(*get)(struct Qdisc *, u32 classid);
-	void			(*put)(struct Qdisc *, unsigned long);
+	unsigned long		(*find)(struct Qdisc *, u32 classid);
 	int			(*change)(struct Qdisc *, u32, u32,
 					struct nlattr **, unsigned long *);
 	int			(*delete)(struct Qdisc *, unsigned long);

net/sched/cls_api.c

@@ -586,7 +586,7 @@ static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
 
 	/* Do we search for filter, attached to class? */
 	if (TC_H_MIN(parent)) {
-		cl = cops->get(q, parent);
+		cl = cops->find(q, parent);
 		if (cl == 0)
 			return -ENOENT;
 	}
@@ -716,8 +716,6 @@ static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
 errout:
 	if (chain)
 		tcf_chain_put(chain);
-	if (cl)
-		cops->put(q, cl);
 	if (err == -EAGAIN)
 		/* Replay the request. */
 		goto replay;
@@ -822,17 +820,17 @@ static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
 		goto out;
 	cops = q->ops->cl_ops;
 	if (!cops)
-		goto errout;
+		goto out;
 	if (!cops->tcf_block)
-		goto errout;
+		goto out;
 	if (TC_H_MIN(tcm->tcm_parent)) {
-		cl = cops->get(q, tcm->tcm_parent);
+		cl = cops->find(q, tcm->tcm_parent);
 		if (cl == 0)
-			goto errout;
+			goto out;
 	}
 	block = cops->tcf_block(q, cl);
 	if (!block)
-		goto errout;
+		goto out;
 
 	index_start = cb->args[0];
 	index = 0;
@@ -847,9 +845,6 @@ static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
 
 	cb->args[0] = index;
 
-errout:
-	if (cl)
-		cops->put(q, cl);
 out:
 	return skb->len;
 }

net/sched/cls_u32.c

@@ -40,6 +40,8 @@
 #include <linux/rtnetlink.h>
 #include <linux/skbuff.h>
 #include <linux/bitmap.h>
+#include <linux/netdevice.h>
+#include <linux/hash.h>
 #include <net/netlink.h>
 #include <net/act_api.h>
 #include <net/pkt_cls.h>
@@ -92,6 +94,7 @@ struct tc_u_common {
 	struct Qdisc		*q;
 	int			refcnt;
 	u32			hgenerator;
+	struct hlist_node	hnode;
 	struct rcu_head		rcu;
 };
 
@@ -323,12 +326,40 @@ static u32 gen_new_htid(struct tc_u_common *tp_c)
 	return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
 }
 
+static struct hlist_head *tc_u_common_hash;
+
+#define U32_HASH_SHIFT 10
+#define U32_HASH_SIZE (1 << U32_HASH_SHIFT)
+
+static unsigned int tc_u_hash(const struct tcf_proto *tp)
+{
+	struct net_device *dev = tp->q->dev_queue->dev;
+	u32 qhandle = tp->q->handle;
+	int ifindex = dev->ifindex;
+
+	return hash_64((u64)ifindex << 32 | qhandle, U32_HASH_SHIFT);
+}
+
+static struct tc_u_common *tc_u_common_find(const struct tcf_proto *tp)
+{
+	struct tc_u_common *tc;
+	unsigned int h;
+
+	h = tc_u_hash(tp);
+	hlist_for_each_entry(tc, &tc_u_common_hash[h], hnode) {
+		if (tc->q == tp->q)
+			return tc;
+	}
+	return NULL;
+}
+
 static int u32_init(struct tcf_proto *tp)
 {
 	struct tc_u_hnode *root_ht;
 	struct tc_u_common *tp_c;
+	unsigned int h;
 
-	tp_c = tp->q->u32_node;
+	tp_c = tc_u_common_find(tp);
 
 	root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
 	if (root_ht == NULL)
@@ -345,7 +376,10 @@ static int u32_init(struct tcf_proto *tp)
 			return -ENOBUFS;
 		}
 		tp_c->q = tp->q;
-		tp->q->u32_node = tp_c;
+		INIT_HLIST_NODE(&tp_c->hnode);
+
+		h = tc_u_hash(tp);
+		hlist_add_head(&tp_c->hnode, &tc_u_common_hash[h]);
 	}
 
 	tp_c->refcnt++;
@@ -585,7 +619,7 @@ static void u32_destroy(struct tcf_proto *tp)
 	if (--tp_c->refcnt == 0) {
 		struct tc_u_hnode *ht;
 
-		tp->q->u32_node = NULL;
+		hlist_del(&tp_c->hnode);
 
 		for (ht = rtnl_dereference(tp_c->hlist);
 		     ht;
@@ -1213,6 +1247,8 @@ static struct tcf_proto_ops cls_u32_ops __read_mostly = {
 
 static int __init init_u32(void)
 {
+	int i, ret;
+
 	pr_info("u32 classifier\n");
 #ifdef CONFIG_CLS_U32_PERF
 	pr_info("    Performance counters on\n");
@@ -1223,12 +1259,25 @@ static int __init init_u32(void)
 #ifdef CONFIG_NET_CLS_ACT
 	pr_info("    Actions configured\n");
 #endif
-	return register_tcf_proto_ops(&cls_u32_ops);
+	tc_u_common_hash = kvmalloc_array(U32_HASH_SIZE,
+					  sizeof(struct hlist_head),
+					  GFP_KERNEL);
+	if (!tc_u_common_hash)
+		return -ENOMEM;
+
+	for (i = 0; i < U32_HASH_SIZE; i++)
+		INIT_HLIST_HEAD(&tc_u_common_hash[i]);
+
+	ret = register_tcf_proto_ops(&cls_u32_ops);
+	if (ret)
+		kvfree(tc_u_common_hash);
+	return ret;
 }
 
 static void __exit exit_u32(void)
 {
 	unregister_tcf_proto_ops(&cls_u32_ops);
+	kvfree(tc_u_common_hash);
 }
 
 module_init(init_u32)

net/sched/sch_atm.c

@@ -108,23 +108,29 @@ static struct Qdisc *atm_tc_leaf(struct Qdisc *sch, unsigned long cl)
 	return flow ? flow->q : NULL;
 }
 
-static unsigned long atm_tc_get(struct Qdisc *sch, u32 classid)
+static unsigned long atm_tc_find(struct Qdisc *sch, u32 classid)
 {
 	struct atm_qdisc_data *p __maybe_unused = qdisc_priv(sch);
 	struct atm_flow_data *flow;
 
-	pr_debug("atm_tc_get(sch %p,[qdisc %p],classid %x)\n", sch, p, classid);
+	pr_debug("%s(sch %p,[qdisc %p],classid %x)\n", __func__, sch, p, classid);
 	flow = lookup_flow(sch, classid);
-	if (flow)
-		flow->ref++;
-	pr_debug("atm_tc_get: flow %p\n", flow);
+	pr_debug("%s: flow %p\n", __func__, flow);
 	return (unsigned long)flow;
 }
 
 static unsigned long atm_tc_bind_filter(struct Qdisc *sch,
 					unsigned long parent, u32 classid)
 {
-	return atm_tc_get(sch, classid);
+	struct atm_qdisc_data *p __maybe_unused = qdisc_priv(sch);
+	struct atm_flow_data *flow;
+
+	pr_debug("%s(sch %p,[qdisc %p],classid %x)\n", __func__, sch, p, classid);
+	flow = lookup_flow(sch, classid);
+	if (flow)
+		flow->ref++;
+	pr_debug("%s: flow %p\n", __func__, flow);
+	return (unsigned long)flow;
 }
 
 /*
@@ -234,7 +240,7 @@ static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
 		excess = NULL;
 	else {
 		excess = (struct atm_flow_data *)
-			atm_tc_get(sch, nla_get_u32(tb[TCA_ATM_EXCESS]));
+			atm_tc_find(sch, nla_get_u32(tb[TCA_ATM_EXCESS]));
 		if (!excess)
 			return -ENOENT;
 	}
@@ -262,10 +268,9 @@ static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
 
 		for (i = 1; i < 0x8000; i++) {
 			classid = TC_H_MAKE(sch->handle, 0x8000 | i);
-			cl = atm_tc_get(sch, classid);
+			cl = atm_tc_find(sch, classid);
 			if (!cl)
 				break;
-			atm_tc_put(sch, cl);
 		}
 	}
 	pr_debug("atm_tc_change: new id %x\n", classid);
@@ -305,8 +310,6 @@ static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
 	*arg = (unsigned long)flow;
 	return 0;
 err_out:
-	if (excess)
-		atm_tc_put(sch, (unsigned long)excess);
 	sockfd_put(sock);
 	return error;
 }
@@ -377,7 +380,7 @@ static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
 	result = TC_ACT_OK;	/* be nice to gcc */
 	flow = NULL;
 	if (TC_H_MAJ(skb->priority) != sch->handle ||
-	    !(flow = (struct atm_flow_data *)atm_tc_get(sch, skb->priority))) {
+	    !(flow = (struct atm_flow_data *)atm_tc_find(sch, skb->priority))) {
 		struct tcf_proto *fl;
 
 		list_for_each_entry(flow, &p->flows, list) {
@@ -655,8 +658,7 @@ static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb)
 static const struct Qdisc_class_ops atm_class_ops = {
 	.graft		= atm_tc_graft,
 	.leaf		= atm_tc_leaf,
-	.get		= atm_tc_get,
-	.put		= atm_tc_put,
+	.find		= atm_tc_find,
 	.change		= atm_tc_change,
 	.delete		= atm_tc_delete,
 	.walk		= atm_tc_walk,

net/sched/sch_cbq.c

@@ -129,7 +129,6 @@ struct cbq_class {
 	struct tcf_proto __rcu	*filter_list;
 	struct tcf_block	*block;
 
-	int			refcnt;
 	int			filters;
 
 	struct cbq_class	*defaults[TC_PRIO_MAX + 1];
@@ -1155,7 +1154,6 @@ static int cbq_init(struct Qdisc *sch, struct nlattr *opt)
 	if (err < 0)
 		goto put_rtab;
 
-	q->link.refcnt = 1;
 	q->link.sibling = &q->link;
 	q->link.common.classid = sch->handle;
 	q->link.qdisc = sch;
@@ -1388,16 +1386,11 @@ static void cbq_qlen_notify(struct Qdisc *sch, unsigned long arg)
 	cbq_deactivate_class(cl);
 }
 
-static unsigned long cbq_get(struct Qdisc *sch, u32 classid)
+static unsigned long cbq_find(struct Qdisc *sch, u32 classid)
 {
 	struct cbq_sched_data *q = qdisc_priv(sch);
-	struct cbq_class *cl = cbq_class_lookup(q, classid);
 
-	if (cl) {
-		cl->refcnt++;
-		return (unsigned long)cl;
-	}
-	return 0;
+	return (unsigned long)cbq_class_lookup(q, classid);
 }
 
 static void cbq_destroy_class(struct Qdisc *sch, struct cbq_class *cl)
@@ -1443,25 +1436,6 @@ static void cbq_destroy(struct Qdisc *sch)
 	qdisc_class_hash_destroy(&q->clhash);
 }
 
-static void cbq_put(struct Qdisc *sch, unsigned long arg)
-{
-	struct cbq_class *cl = (struct cbq_class *)arg;
-
-	if (--cl->refcnt == 0) {
-#ifdef CONFIG_NET_CLS_ACT
-		spinlock_t *root_lock = qdisc_root_sleeping_lock(sch);
-		struct cbq_sched_data *q = qdisc_priv(sch);
-
-		spin_lock_bh(root_lock);
-		if (q->rx_class == cl)
-			q->rx_class = NULL;
-		spin_unlock_bh(root_lock);
-#endif
-
-		cbq_destroy_class(sch, cl);
-	}
-}
-
 static int
 cbq_change_class(struct Qdisc *sch, u32 classid, u32 parentid, struct nlattr **tca,
 		 unsigned long *arg)
@@ -1608,7 +1582,6 @@ cbq_change_class(struct Qdisc *sch, u32 classid, u32 parentid, struct nlattr **t
 
 	cl->R_tab = rtab;
 	rtab = NULL;
-	cl->refcnt = 1;
 	cl->q = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, classid);
 	if (!cl->q)
 		cl->q = &noop_qdisc;
@@ -1689,12 +1662,7 @@ static int cbq_delete(struct Qdisc *sch, unsigned long arg)
 	cbq_rmprio(q, cl);
 	sch_tree_unlock(sch);
 
-	BUG_ON(--cl->refcnt == 0);
-	/*
-	 * This shouldn't happen: we "hold" one cops->get() when called
-	 * from tc_ctl_tclass; the destroy method is done from cops->put().
-	 */
-
+	cbq_destroy_class(sch, cl);
 	return 0;
 }
 
@@ -1760,8 +1728,7 @@ static const struct Qdisc_class_ops cbq_class_ops = {
 	.graft		=	cbq_graft,
 	.leaf		=	cbq_leaf,
 	.qlen_notify	=	cbq_qlen_notify,
-	.get		=	cbq_get,
-	.put		=	cbq_put,
+	.find		=	cbq_find,
 	.change		=	cbq_change_class,
 	.delete		=	cbq_delete,
 	.walk		=	cbq_walk,

net/sched/sch_drr.c

@@ -20,7 +20,6 @@
 
 struct drr_class {
 	struct Qdisc_class_common	common;
-	unsigned int			refcnt;
 	unsigned int			filter_cnt;
 
 	struct gnet_stats_basic_packed		bstats;
@@ -111,7 +110,6 @@ static int drr_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
 	if (cl == NULL)
 		return -ENOBUFS;
 
-	cl->refcnt	   = 1;
 	cl->common.classid = classid;
 	cl->quantum	   = quantum;
 	cl->qdisc	   = qdisc_create_dflt(sch->dev_queue,
@@ -163,32 +161,15 @@ static int drr_delete_class(struct Qdisc *sch, unsigned long arg)
 	drr_purge_queue(cl);
 	qdisc_class_hash_remove(&q->clhash, &cl->common);
 
-	BUG_ON(--cl->refcnt == 0);
-	/*
-	 * This shouldn't happen: we "hold" one cops->get() when called
-	 * from tc_ctl_tclass; the destroy method is done from cops->put().
-	 */
-
 	sch_tree_unlock(sch);
-	return 0;
-}
-
-static unsigned long drr_get_class(struct Qdisc *sch, u32 classid)
-{
-	struct drr_class *cl = drr_find_class(sch, classid);
 
-	if (cl != NULL)
-		cl->refcnt++;
-
-	return (unsigned long)cl;
+	drr_destroy_class(sch, cl);
+	return 0;
 }
 
-static void drr_put_class(struct Qdisc *sch, unsigned long arg)
+static unsigned long drr_search_class(struct Qdisc *sch, u32 classid)
 {
-	struct drr_class *cl = (struct drr_class *)arg;
-
-	if (--cl->refcnt == 0)
-		drr_destroy_class(sch, cl);
+	return (unsigned long)drr_find_class(sch, classid);
 }
 
 static struct tcf_block *drr_tcf_block(struct Qdisc *sch, unsigned long cl)
@@ -478,8 +459,7 @@ static void drr_destroy_qdisc(struct Qdisc *sch)
 static const struct Qdisc_class_ops drr_class_ops = {
 	.change		= drr_change_class,
 	.delete		= drr_delete_class,
-	.get		= drr_get_class,
-	.put		= drr_put_class,
+	.find		= drr_search_class,
 	.tcf_block	= drr_tcf_block,
 	.bind_tcf	= drr_bind_tcf,
 	.unbind_tcf	= drr_unbind_tcf,

net/sched/sch_dsmark.c

@@ -85,21 +85,21 @@ static struct Qdisc *dsmark_leaf(struct Qdisc *sch, unsigned long arg)
 	return p->q;
 }
 
-static unsigned long dsmark_get(struct Qdisc *sch, u32 classid)
+static unsigned long dsmark_find(struct Qdisc *sch, u32 classid)
 {
-	pr_debug("%s(sch %p,[qdisc %p],classid %x)\n",
-		 __func__, sch, qdisc_priv(sch), classid);
-
 	return TC_H_MIN(classid) + 1;
 }
 
 static unsigned long dsmark_bind_filter(struct Qdisc *sch,
 					unsigned long parent, u32 classid)
 {
-	return dsmark_get(sch, classid);
+	pr_debug("%s(sch %p,[qdisc %p],classid %x)\n",
+		 __func__, sch, qdisc_priv(sch), classid);
+
+	return dsmark_find(sch, classid);
 }
 
-static void dsmark_put(struct Qdisc *sch, unsigned long cl)
+static void dsmark_unbind_filter(struct Qdisc *sch, unsigned long cl)
 {
 }
 
@@ -469,14 +469,13 @@ static int dsmark_dump(struct Qdisc *sch, struct sk_buff *skb)
 static const struct Qdisc_class_ops dsmark_class_ops = {
 	.graft		=	dsmark_graft,
 	.leaf		=	dsmark_leaf,
-	.get		=	dsmark_get,
-	.put		=	dsmark_put,
+	.find		=	dsmark_find,
 	.change		=	dsmark_change,
 	.delete		=	dsmark_delete,
 	.walk		=	dsmark_walk,
 	.tcf_block	=	dsmark_tcf_block,
 	.bind_tcf	=	dsmark_bind_filter,
-	.unbind_tcf	=	dsmark_put,
+	.unbind_tcf	=	dsmark_unbind_filter,
 	.dump		=	dsmark_dump_class,
 };
 

net/sched/sch_fq_codel.c

@@ -579,7 +579,7 @@ static struct Qdisc *fq_codel_leaf(struct Qdisc *sch, unsigned long arg)
 	return NULL;
 }
 
-static unsigned long fq_codel_get(struct Qdisc *sch, u32 classid)
+static unsigned long fq_codel_find(struct Qdisc *sch, u32 classid)
 {
 	return 0;
 }
@@ -592,7 +592,7 @@ static unsigned long fq_codel_bind(struct Qdisc *sch, unsigned long parent,
 	return 0;
 }
 
-static void fq_codel_put(struct Qdisc *q, unsigned long cl)
+static void fq_codel_unbind(struct Qdisc *q, unsigned long cl)
 {
 }
 
@@ -683,11 +683,10 @@ static void fq_codel_walk(struct Qdisc *sch, struct qdisc_walker *arg)
 
 static const struct Qdisc_class_ops fq_codel_class_ops = {
 	.leaf		=	fq_codel_leaf,
-	.get		=	fq_codel_get,
-	.put		=	fq_codel_put,
+	.find		=	fq_codel_find,
 	.tcf_block	=	fq_codel_tcf_block,
 	.bind_tcf	=	fq_codel_bind,
-	.unbind_tcf	=	fq_codel_put,
+	.unbind_tcf	=	fq_codel_unbind,
 	.dump		=	fq_codel_dump_class,
 	.dump_stats	=	fq_codel_dump_class_stats,
 	.walk		=	fq_codel_walk,

net/sched/sch_hfsc.c

@@ -110,7 +110,6 @@ enum hfsc_class_flags {
 
 struct hfsc_class {
 	struct Qdisc_class_common cl_common;
-	unsigned int	refcnt;		/* usage count */
 
 	struct gnet_stats_basic_packed bstats;
 	struct gnet_stats_queue qstats;
@@ -1045,7 +1044,6 @@ hfsc_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
 		hfsc_change_usc(cl, usc, 0);
 
 	cl->cl_common.classid = classid;
-	cl->refcnt    = 1;
 	cl->sched     = q;
 	cl->cl_parent = parent;
 	cl->qdisc = qdisc_create_dflt(sch->dev_queue,
@@ -1101,13 +1099,9 @@ hfsc_delete_class(struct Qdisc *sch, unsigned long arg)
 	hfsc_purge_queue(sch, cl);
 	qdisc_class_hash_remove(&q->clhash, &cl->cl_common);
 
-	BUG_ON(--cl->refcnt == 0);
-	/*
-	 * This shouldn't happen: we "hold" one cops->get() when called
-	 * from tc_ctl_tclass; the destroy method is done from cops->put().
-	 */
-
 	sch_tree_unlock(sch);
+
+	hfsc_destroy_class(sch, cl);
 	return 0;
 }
 
@@ -1208,23 +1202,9 @@ hfsc_qlen_notify(struct Qdisc *sch, unsigned long arg)
 }
 
 static unsigned long
-hfsc_get_class(struct Qdisc *sch, u32 classid)
-{
-	struct hfsc_class *cl = hfsc_find_class(classid, sch);
-
-	if (cl != NULL)
-		cl->refcnt++;
-
-	return (unsigned long)cl;
-}
-
-static void
-hfsc_put_class(struct Qdisc *sch, unsigned long arg)
+hfsc_search_class(struct Qdisc *sch, u32 classid)
 {
-	struct hfsc_class *cl = (struct hfsc_class *)arg;
-
-	if (--cl->refcnt == 0)
-		hfsc_destroy_class(sch, cl);
+	return (unsigned long)hfsc_find_class(classid, sch);
 }
 
 static unsigned long
@@ -1413,7 +1393,6 @@ hfsc_init_qdisc(struct Qdisc *sch, struct nlattr *opt)
 		goto err_tcf;
 
 	q->root.cl_common.classid = sch->handle;
-	q->root.refcnt  = 1;
 	q->root.sched   = q;
 	q->root.qdisc = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops,
 					  sch->handle);
@@ -1661,8 +1640,7 @@ static const struct Qdisc_class_ops hfsc_class_ops = {
 	.graft		= hfsc_graft_class,
 	.leaf		= hfsc_class_leaf,
 	.qlen_notify	= hfsc_qlen_notify,
-	.get		= hfsc_get_class,
-	.put		= hfsc_put_class,
+	.find		= hfsc_search_class,
 	.bind_tcf	= hfsc_bind_tcf,
 	.unbind_tcf	= hfsc_unbind_tcf,
 	.tcf_block	= hfsc_tcf_block,

net/sched/sch_htb.c

@@ -107,7 +107,6 @@ struct htb_class {
 	struct tcf_proto __rcu	*filter_list;	/* class attached filters */
 	struct tcf_block	*block;
 	int			filter_cnt;
-	int			refcnt;		/* usage count of this class */
 
 	int			level;		/* our level (see above) */
 	unsigned int		children;
@@ -193,6 +192,10 @@ static inline struct htb_class *htb_find(u32 handle, struct Qdisc *sch)
 	return container_of(clc, struct htb_class, common);
 }
 
+static unsigned long htb_search(struct Qdisc *sch, u32 handle)
+{
+	return (unsigned long)htb_find(handle, sch);
+}
 /**
  * htb_classify - classify a packet into class
  *
@@ -1189,14 +1192,6 @@ static void htb_qlen_notify(struct Qdisc *sch, unsigned long arg)
 	htb_deactivate(qdisc_priv(sch), cl);
 }
 
-static unsigned long htb_get(struct Qdisc *sch, u32 classid)
-{
-	struct htb_class *cl = htb_find(classid, sch);
-	if (cl)
-		cl->refcnt++;
-	return (unsigned long)cl;
-}
-
 static inline int htb_parent_last_child(struct htb_class *cl)
 {
 	if (!cl->parent)
@@ -1316,22 +1311,10 @@ static int htb_delete(struct Qdisc *sch, unsigned long arg)
 	if (last_child)
 		htb_parent_to_leaf(q, cl, new_q);
 
-	BUG_ON(--cl->refcnt == 0);
-	/*
-	 * This shouldn't happen: we "hold" one cops->get() when called
-	 * from tc_ctl_tclass; the destroy method is done from cops->put().
-	 */
-
 	sch_tree_unlock(sch);
-	return 0;
-}
 
-static void htb_put(struct Qdisc *sch, unsigned long arg)
-{
-	struct htb_class *cl = (struct htb_class *)arg;
-
-	if (--cl->refcnt == 0)
-		htb_destroy_class(sch, cl);
+	htb_destroy_class(sch, cl);
+	return 0;
 }
 
 static int htb_change_class(struct Qdisc *sch, u32 classid,
@@ -1422,7 +1405,6 @@ static int htb_change_class(struct Qdisc *sch, u32 classid,
 			}
 		}
 
-		cl->refcnt = 1;
 		cl->children = 0;
 		INIT_LIST_HEAD(&cl->un.leaf.drop_list);
 		RB_CLEAR_NODE(&cl->pq_node);
@@ -1598,8 +1580,7 @@ static const struct Qdisc_class_ops htb_class_ops = {
 	.graft		=	htb_graft,
 	.leaf		=	htb_leaf,
 	.qlen_notify	=	htb_qlen_notify,
-	.get		=	htb_get,
-	.put		=	htb_put,
+	.find		=	htb_search,
 	.change		=	htb_change_class,
 	.delete		=	htb_delete,
 	.walk		=	htb_walk,

net/sched/sch_ingress.c

@@ -27,7 +27,7 @@ static struct Qdisc *ingress_leaf(struct Qdisc *sch, unsigned long arg)
 	return NULL;
 }
 
-static unsigned long ingress_get(struct Qdisc *sch, u32 classid)
+static unsigned long ingress_find(struct Qdisc *sch, u32 classid)
 {
 	return TC_H_MIN(classid) + 1;
 }
@@ -35,10 +35,10 @@ static unsigned long ingress_get(struct Qdisc *sch, u32 classid)
 static unsigned long ingress_bind_filter(struct Qdisc *sch,
 					 unsigned long parent, u32 classid)
 {
-	return ingress_get(sch, classid);
+	return ingress_find(sch, classid);
 }
 
-static void ingress_put(struct Qdisc *sch, unsigned long cl)
+static void ingress_unbind_filter(struct Qdisc *sch, unsigned long cl)
 {
 }
 
@@ -94,12 +94,11 @@ static int ingress_dump(struct Qdisc *sch, struct sk_buff *skb)
 
 static const struct Qdisc_class_ops ingress_class_ops = {
 	.leaf		=	ingress_leaf,
-	.get		=	ingress_get,
-	.put		=	ingress_put,
+	.find		=	ingress_find,
 	.walk		=	ingress_walk,
 	.tcf_block	=	ingress_tcf_block,
 	.bind_tcf	=	ingress_bind_filter,
-	.unbind_tcf	=	ingress_put,
+	.unbind_tcf	=	ingress_unbind_filter,
 };
 
 static struct Qdisc_ops ingress_qdisc_ops __read_mostly = {
@@ -117,7 +116,7 @@ struct clsact_sched_data {
 	struct tcf_block *egress_block;
 };
 
-static unsigned long clsact_get(struct Qdisc *sch, u32 classid)
+static unsigned long clsact_find(struct Qdisc *sch, u32 classid)
 {
 	switch (TC_H_MIN(classid)) {
 	case TC_H_MIN(TC_H_MIN_INGRESS):
@@ -131,7 +130,7 @@ static unsigned long clsact_get(struct Qdisc *sch, u32 classid)
 static unsigned long clsact_bind_filter(struct Qdisc *sch,
 					unsigned long parent, u32 classid)
 {
-	return clsact_get(sch, classid);
+	return clsact_find(sch, classid);
 }
 
 static struct tcf_block *clsact_tcf_block(struct Qdisc *sch, unsigned long cl)
@@ -183,12 +182,11 @@ static void clsact_destroy(struct Qdisc *sch)
 
 static const struct Qdisc_class_ops clsact_class_ops = {
 	.leaf		=	ingress_leaf,
-	.get		=	clsact_get,
-	.put		=	ingress_put,
+	.find		=	clsact_find,
 	.walk		=	ingress_walk,
 	.tcf_block	=	clsact_tcf_block,
 	.bind_tcf	=	clsact_bind_filter,
-	.unbind_tcf	=	ingress_put,
+	.unbind_tcf	=	ingress_unbind_filter,
 };
 
 static struct Qdisc_ops clsact_qdisc_ops __read_mostly = {

net/sched/sch_mq.c

@@ -165,7 +165,7 @@ static struct Qdisc *mq_leaf(struct Qdisc *sch, unsigned long cl)
 	return dev_queue->qdisc_sleeping;
 }
 
-static unsigned long mq_get(struct Qdisc *sch, u32 classid)
+static unsigned long mq_find(struct Qdisc *sch, u32 classid)
 {
 	unsigned int ntx = TC_H_MIN(classid);
 
@@ -174,10 +174,6 @@ static unsigned long mq_get(struct Qdisc *sch, u32 classid)
 	return ntx;
 }
 
-static void mq_put(struct Qdisc *sch, unsigned long cl)
-{
-}
-
 static int mq_dump_class(struct Qdisc *sch, unsigned long cl,
 			 struct sk_buff *skb, struct tcmsg *tcm)
 {
@@ -223,8 +219,7 @@ static const struct Qdisc_class_ops mq_class_ops = {
 	.select_queue	= mq_select_queue,
 	.graft		= mq_graft,
 	.leaf		= mq_leaf,
-	.get		= mq_get,
-	.put		= mq_put,
+	.find		= mq_find,
 	.walk		= mq_walk,
 	.dump		= mq_dump_class,
 	.dump_stats	= mq_dump_class_stats,

net/sched/sch_mqprio.c

@@ -277,7 +277,7 @@ static struct Qdisc *mqprio_leaf(struct Qdisc *sch, unsigned long cl)
 	return dev_queue->qdisc_sleeping;
 }
 
-static unsigned long mqprio_get(struct Qdisc *sch, u32 classid)
+static unsigned long mqprio_find(struct Qdisc *sch, u32 classid)
 {
 	struct net_device *dev = qdisc_dev(sch);
 	unsigned int ntx = TC_H_MIN(classid);
@@ -287,10 +287,6 @@ static unsigned long mqprio_get(struct Qdisc *sch, u32 classid)
 	return ntx;
 }
 
-static void mqprio_put(struct Qdisc *sch, unsigned long cl)
-{
-}
-
 static int mqprio_dump_class(struct Qdisc *sch, unsigned long cl,
 			 struct sk_buff *skb, struct tcmsg *tcm)
 {
@@ -403,8 +399,7 @@ static void mqprio_walk(struct Qdisc *sch, struct qdisc_walker *arg)
 static const struct Qdisc_class_ops mqprio_class_ops = {
 	.graft		= mqprio_graft,
 	.leaf		= mqprio_leaf,
-	.get		= mqprio_get,
-	.put		= mqprio_put,
+	.find		= mqprio_find,
 	.walk		= mqprio_walk,
 	.dump		= mqprio_dump_class,
 	.dump_stats	= mqprio_dump_class_stats,

net/sched/sch_multiq.c

@@ -306,7 +306,7 @@ multiq_leaf(struct Qdisc *sch, unsigned long arg)
 	return q->queues[band];
 }
 
-static unsigned long multiq_get(struct Qdisc *sch, u32 classid)
+static unsigned long multiq_find(struct Qdisc *sch, u32 classid)
 {
 	struct multiq_sched_data *q = qdisc_priv(sch);
 	unsigned long band = TC_H_MIN(classid);
@@ -319,11 +319,11 @@ static unsigned long multiq_get(struct Qdisc *sch, u32 classid)
 static unsigned long multiq_bind(struct Qdisc *sch, unsigned long parent,
 				 u32 classid)
 {
-	return multiq_get(sch, classid);
+	return multiq_find(sch, classid);
 }
 
 
-static void multiq_put(struct Qdisc *q, unsigned long cl)
+static void multiq_unbind(struct Qdisc *q, unsigned long cl)
 {
 }
 
@@ -385,12 +385,11 @@ static struct tcf_block *multiq_tcf_block(struct Qdisc *sch, unsigned long cl)
 static const struct Qdisc_class_ops multiq_class_ops = {
 	.graft		=	multiq_graft,
 	.leaf		=	multiq_leaf,
-	.get		=	multiq_get,
-	.put		=	multiq_put,
+	.find		=	multiq_find,
 	.walk		=	multiq_walk,
 	.tcf_block	=	multiq_tcf_block,
 	.bind_tcf	=	multiq_bind,
-	.unbind_tcf	=	multiq_put,
+	.unbind_tcf	=	multiq_unbind,
 	.dump		=	multiq_dump_class,
 	.dump_stats	=	multiq_dump_class_stats,
 };

net/sched/sch_netem.c

@@ -1096,15 +1096,11 @@ static struct Qdisc *netem_leaf(struct Qdisc *sch, unsigned long arg)
 	return q->qdisc;
 }
 
-static unsigned long netem_get(struct Qdisc *sch, u32 classid)
+static unsigned long netem_find(struct Qdisc *sch, u32 classid)
 {
 	return 1;
 }
 
-static void netem_put(struct Qdisc *sch, unsigned long arg)
-{
-}
-
 static void netem_walk(struct Qdisc *sch, struct qdisc_walker *walker)
 {
 	if (!walker->stop) {
@@ -1120,8 +1116,7 @@ static void netem_walk(struct Qdisc *sch, struct qdisc_walker *walker)
 static const struct Qdisc_class_ops netem_class_ops = {
 	.graft		=	netem_graft,
 	.leaf		=	netem_leaf,
-	.get		=	netem_get,
-	.put		=	netem_put,
+	.find		=	netem_find,
 	.walk		=	netem_walk,
 	.dump		=	netem_dump_class,
 };

net/sched/sch_prio.c

@@ -260,7 +260,7 @@ prio_leaf(struct Qdisc *sch, unsigned long arg)
 	return q->queues[band];
 }
 
-static unsigned long prio_get(struct Qdisc *sch, u32 classid)
+static unsigned long prio_find(struct Qdisc *sch, u32 classid)
 {
 	struct prio_sched_data *q = qdisc_priv(sch);
 	unsigned long band = TC_H_MIN(classid);
@@ -272,11 +272,11 @@ static unsigned long prio_get(struct Qdisc *sch, u32 classid)
 
 static unsigned long prio_bind(struct Qdisc *sch, unsigned long parent, u32 classid)
 {
-	return prio_get(sch, classid);
+	return prio_find(sch, classid);
 }
 
 
-static void prio_put(struct Qdisc *q, unsigned long cl)
+static void prio_unbind(struct Qdisc *q, unsigned long cl)
 {
 }
 
@@ -338,12 +338,11 @@ static struct tcf_block *prio_tcf_block(struct Qdisc *sch, unsigned long cl)
 static const struct Qdisc_class_ops prio_class_ops = {
 	.graft		=	prio_graft,
 	.leaf		=	prio_leaf,
-	.get		=	prio_get,
-	.put		=	prio_put,
+	.find		=	prio_find,
 	.walk		=	prio_walk,
 	.tcf_block	=	prio_tcf_block,
 	.bind_tcf	=	prio_bind,
-	.unbind_tcf	=	prio_put,
+	.unbind_tcf	=	prio_unbind,
 	.dump		=	prio_dump_class,
 	.dump_stats	=	prio_dump_class_stats,
 };

net/sched/sch_qfq.c

@@ -132,7 +132,6 @@ struct qfq_aggregate;
 struct qfq_class {
 	struct Qdisc_class_common common;
 
-	unsigned int refcnt;
 	unsigned int filter_cnt;
 
 	struct gnet_stats_basic_packed bstats;
@@ -477,7 +476,6 @@ static int qfq_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
 	if (cl == NULL)
 		return -ENOBUFS;
 
-	cl->refcnt = 1;
 	cl->common.classid = classid;
 	cl->deficit = lmax;
 
@@ -555,32 +553,15 @@ static int qfq_delete_class(struct Qdisc *sch, unsigned long arg)
 	qfq_purge_queue(cl);
 	qdisc_class_hash_remove(&q->clhash, &cl->common);
 
-	BUG_ON(--cl->refcnt == 0);
-	/*
-	 * This shouldn't happen: we "hold" one cops->get() when called
-	 * from tc_ctl_tclass; the destroy method is done from cops->put().
-	 */
-
 	sch_tree_unlock(sch);
-	return 0;
-}
-
-static unsigned long qfq_get_class(struct Qdisc *sch, u32 classid)
-{
-	struct qfq_class *cl = qfq_find_class(sch, classid);
-
-	if (cl != NULL)
-		cl->refcnt++;
 
-	return (unsigned long)cl;
+	qfq_destroy_class(sch, cl);
+	return 0;
 }
 
-static void qfq_put_class(struct Qdisc *sch, unsigned long arg)
+static unsigned long qfq_search_class(struct Qdisc *sch, u32 classid)
 {
-	struct qfq_class *cl = (struct qfq_class *)arg;
-
-	if (--cl->refcnt == 0)
-		qfq_destroy_class(sch, cl);
+	return (unsigned long)qfq_find_class(sch, classid);
 }
 
 static struct tcf_block *qfq_tcf_block(struct Qdisc *sch, unsigned long cl)
@@ -1510,8 +1491,7 @@ static void qfq_destroy_qdisc(struct Qdisc *sch)
 static const struct Qdisc_class_ops qfq_class_ops = {
 	.change		= qfq_change_class,
 	.delete		= qfq_delete_class,
-	.get		= qfq_get_class,
-	.put		= qfq_put_class,
+	.find		= qfq_search_class,
 	.tcf_block	= qfq_tcf_block,
 	.bind_tcf	= qfq_bind_tcf,
 	.unbind_tcf	= qfq_unbind_tcf,

net/sched/sch_red.c

@@ -311,15 +311,11 @@ static struct Qdisc *red_leaf(struct Qdisc *sch, unsigned long arg)
 	return q->qdisc;
 }
 
-static unsigned long red_get(struct Qdisc *sch, u32 classid)
+static unsigned long red_find(struct Qdisc *sch, u32 classid)
 {
 	return 1;
 }
 
-static void red_put(struct Qdisc *sch, unsigned long arg)
-{
-}
-
 static void red_walk(struct Qdisc *sch, struct qdisc_walker *walker)
 {
 	if (!walker->stop) {
@@ -335,8 +331,7 @@ static void red_walk(struct Qdisc *sch, struct qdisc_walker *walker)
 static const struct Qdisc_class_ops red_class_ops = {
 	.graft		=	red_graft,
 	.leaf		=	red_leaf,
-	.get		=	red_get,
-	.put		=	red_put,
+	.find		=	red_find,
 	.walk		=	red_walk,
 	.dump		=	red_dump_class,
 };

net/sched/sch_sfb.c

@@ -632,12 +632,12 @@ static struct Qdisc *sfb_leaf(struct Qdisc *sch, unsigned long arg)
 	return q->qdisc;
 }
 
-static unsigned long sfb_get(struct Qdisc *sch, u32 classid)
+static unsigned long sfb_find(struct Qdisc *sch, u32 classid)
 {
 	return 1;
 }
 
-static void sfb_put(struct Qdisc *sch, unsigned long arg)
+static void sfb_unbind(struct Qdisc *sch, unsigned long arg)
 {
 }
 
@@ -683,14 +683,13 @@ static unsigned long sfb_bind(struct Qdisc *sch, unsigned long parent,
 static const struct Qdisc_class_ops sfb_class_ops = {
 	.graft		=	sfb_graft,
 	.leaf		=	sfb_leaf,
-	.get		=	sfb_get,
-	.put		=	sfb_put,
+	.find		=	sfb_find,
 	.change		=	sfb_change_class,
 	.delete		=	sfb_delete,
 	.walk		=	sfb_walk,
 	.tcf_block	=	sfb_tcf_block,
 	.bind_tcf	=	sfb_bind,
-	.unbind_tcf	=	sfb_put,
+	.unbind_tcf	=	sfb_unbind,
 	.dump		=	sfb_dump_class,
 };
 

net/sched/sch_sfq.c

@@ -808,7 +808,7 @@ static struct Qdisc *sfq_leaf(struct Qdisc *sch, unsigned long arg)
 	return NULL;
 }
 
-static unsigned long sfq_get(struct Qdisc *sch, u32 classid)
+static unsigned long sfq_find(struct Qdisc *sch, u32 classid)
 {
 	return 0;
 }
@@ -821,7 +821,7 @@ static unsigned long sfq_bind(struct Qdisc *sch, unsigned long parent,
 	return 0;
 }
 
-static void sfq_put(struct Qdisc *q, unsigned long cl)
+static void sfq_unbind(struct Qdisc *q, unsigned long cl)
 {
 }
 
@@ -885,11 +885,10 @@ static void sfq_walk(struct Qdisc *sch, struct qdisc_walker *arg)
 
 static const struct Qdisc_class_ops sfq_class_ops = {
 	.leaf		=	sfq_leaf,
-	.get		=	sfq_get,
-	.put		=	sfq_put,
+	.find		=	sfq_find,
 	.tcf_block	=	sfq_tcf_block,
 	.bind_tcf	=	sfq_bind,
-	.unbind_tcf	=	sfq_put,
+	.unbind_tcf	=	sfq_unbind,
 	.dump		=	sfq_dump_class,
 	.dump_stats	=	sfq_dump_class_stats,
 	.walk		=	sfq_walk,

net/sched/sch_tbf.c

@@ -510,15 +510,11 @@ static struct Qdisc *tbf_leaf(struct Qdisc *sch, unsigned long arg)
 	return q->qdisc;
 }
 
-static unsigned long tbf_get(struct Qdisc *sch, u32 classid)
+static unsigned long tbf_find(struct Qdisc *sch, u32 classid)
 {
 	return 1;
 }
 
-static void tbf_put(struct Qdisc *sch, unsigned long arg)
-{
-}
-
 static void tbf_walk(struct Qdisc *sch, struct qdisc_walker *walker)
 {
 	if (!walker->stop) {
@@ -534,8 +530,7 @@ static void tbf_walk(struct Qdisc *sch, struct qdisc_walker *walker)
 static const struct Qdisc_class_ops tbf_class_ops = {
 	.graft		=	tbf_graft,
 	.leaf		=	tbf_leaf,
-	.get		=	tbf_get,
-	.put		=	tbf_put,
+	.find		=	tbf_find,
 	.walk		=	tbf_walk,
 	.dump		=	tbf_dump_class,
 };