Release 4.14 net/sched/cls_u32.c

/*
 * net/sched/cls_u32.c  Ugly (or Universal) 32bit key Packet Classifier.
 *
 *              This program is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.
 *
 * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 *
 *      The filters are packed to hash tables of key nodes
 *      with a set of 32bit key/mask pairs at every node.
 *      Nodes reference next level hash tables etc.
 *
 *      This scheme is the best universal classifier I managed to
 *      invent; it is not super-fast, but it is not slow (provided you
 *      program it correctly), and general enough.  And its relative
 *      speed grows as the number of rules becomes larger.
 *
 *      It seems that it represents the best middle point between
 *      speed and manageability both by human and by machine.
 *
 *      It is especially useful for link sharing combined with QoS;
 *      pure RSVP doesn't need such a general approach and can use
 *      much simpler (and faster) schemes, sort of cls_rsvp.c.
 *
 *      JHS: We should remove the CONFIG_NET_CLS_IND from here
 *      eventually when the meta match extension is made available
 *
 *      nfmark match added by Catalin(ux aka Dino) BOIE <catab at umbrella.ro>
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/percpu.h>
#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>
#include <linux/netdevice.h>


struct tc_u_knode {
	
struct tc_u_knode __rcu	*next;
	
u32			handle;
	
struct tc_u_hnode __rcu	*ht_up;
	
struct tcf_exts		exts;
#ifdef CONFIG_NET_CLS_IND
	
int			ifindex;
#endif
	
u8			fshift;
	
struct tcf_result	res;
	
struct tc_u_hnode __rcu	*ht_down;
#ifdef CONFIG_CLS_U32_PERF
	
struct tc_u32_pcnt __percpu *pf;
#endif
	
u32			flags;
#ifdef CONFIG_CLS_U32_MARK
	
u32			val;
	
u32			mask;
	
u32 __percpu		*pcpu_success;
#endif
	
struct tcf_proto	*tp;
	union {
		
struct work_struct	work;
		
struct rcu_head		rcu;
	};
	/* The 'sel' field MUST be the last field in structure to allow for
         * tc_u32_keys allocated at end of structure.
         */
	
struct tc_u32_sel	sel;
};


struct tc_u_hnode {
	
struct tc_u_hnode __rcu	*next;
	
u32			handle;
	
u32			prio;
	
struct tc_u_common	*tp_c;
	
int			refcnt;
	
unsigned int		divisor;
	
struct rcu_head		rcu;
	/* The 'ht' field MUST be the last field in structure to allow for
         * more entries allocated at end of structure.
         */
	
struct tc_u_knode __rcu	*ht[1];
};


struct tc_u_common {
	
struct tc_u_hnode __rcu	*hlist;
	
struct Qdisc		*q;
	
int			refcnt;
	
u32			hgenerator;
	
struct hlist_node	hnode;
	
struct rcu_head		rcu;
};



static inline unsigned int u32_hash_fold(__be32 key,
					 const struct tc_u32_sel *sel,
					 u8 fshift)
{
	unsigned int h = ntohl(key & sel->hmask) >> fshift;

	return h;
}

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Linus Torvalds (pre-git)
25
65.79%
1
16.67%
Jamal Hadi Salim
5
13.16%
2
33.33%
Eric Dumazet
4
10.53%
1
16.67%
Radu Rendec
3
7.89%
1
16.67%
Al Viro
1
2.63%
1
16.67%
Total
38
100.00%
6
100.00%



static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp,
			struct tcf_result *res)
{
	struct {
		struct tc_u_knode *knode;
		unsigned int	  off;
	} stack[TC_U32_MAXDEPTH];

	struct tc_u_hnode *ht = rcu_dereference_bh(tp->root);
	unsigned int off = skb_network_offset(skb);
	struct tc_u_knode *n;
	int sdepth = 0;
	int off2 = 0;
	int sel = 0;
#ifdef CONFIG_CLS_U32_PERF
	int j;
#endif
	int i, r;

next_ht:
	n = rcu_dereference_bh(ht->ht[sel]);

next_knode:
	if (n) {
		struct tc_u32_key *key = n->sel.keys;

#ifdef CONFIG_CLS_U32_PERF
		__this_cpu_inc(n->pf->rcnt);
		j = 0;
#endif

		if (tc_skip_sw(n->flags)) {
			n = rcu_dereference_bh(n->next);
			goto next_knode;
		}

#ifdef CONFIG_CLS_U32_MARK
		if ((skb->mark & n->mask) != n->val) {
			n = rcu_dereference_bh(n->next);
			goto next_knode;
		} else {
			__this_cpu_inc(*n->pcpu_success);
		}
#endif

		for (i = n->sel.nkeys; i > 0; i--, key++) {
			int toff = off + key->off + (off2 & key->offmask);
			__be32 *data, hdata;

			if (skb_headroom(skb) + toff > INT_MAX)
				goto out;

			data = skb_header_pointer(skb, toff, 4, &hdata);
			if (!data)
				goto out;
			if ((*data ^ key->val) & key->mask) {
				n = rcu_dereference_bh(n->next);
				goto next_knode;
			}
#ifdef CONFIG_CLS_U32_PERF
			__this_cpu_inc(n->pf->kcnts[j]);
			j++;
#endif
		}

		ht = rcu_dereference_bh(n->ht_down);
		if (!ht) {
check_terminal:
			if (n->sel.flags & TC_U32_TERMINAL) {

				*res = n->res;
#ifdef CONFIG_NET_CLS_IND
				if (!tcf_match_indev(skb, n->ifindex)) {
					n = rcu_dereference_bh(n->next);
					goto next_knode;
				}
#endif
#ifdef CONFIG_CLS_U32_PERF
				__this_cpu_inc(n->pf->rhit);
#endif
				r = tcf_exts_exec(skb, &n->exts, res);
				if (r < 0) {
					n = rcu_dereference_bh(n->next);
					goto next_knode;
				}

				return r;
			}
			n = rcu_dereference_bh(n->next);
			goto next_knode;
		}

		/* PUSH */
		if (sdepth >= TC_U32_MAXDEPTH)
			goto deadloop;
		stack[sdepth].knode = n;
		stack[sdepth].off = off;
		sdepth++;

		ht = rcu_dereference_bh(n->ht_down);
		sel = 0;
		if (ht->divisor) {
			__be32 *data, hdata;

			data = skb_header_pointer(skb, off + n->sel.hoff, 4,
						  &hdata);
			if (!data)
				goto out;
			sel = ht->divisor & u32_hash_fold(*data, &n->sel,
							  n->fshift);
		}
		if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT)))
			goto next_ht;

		if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) {
			off2 = n->sel.off + 3;
			if (n->sel.flags & TC_U32_VAROFFSET) {
				__be16 *data, hdata;

				data = skb_header_pointer(skb,
							  off + n->sel.offoff,
							  2, &hdata);
				if (!data)
					goto out;
				off2 += ntohs(n->sel.offmask & *data) >>
					n->sel.offshift;
			}
			off2 &= ~3;
		}
		if (n->sel.flags & TC_U32_EAT) {
			off += off2;
			off2 = 0;
		}

		if (off < skb->len)
			goto next_ht;
	}

	/* POP */
	if (sdepth--) {
		n = stack[sdepth].knode;
		ht = rcu_dereference_bh(n->ht_up);
		off = stack[sdepth].off;
		goto check_terminal;
	}
out:
	return -1;

deadloop:
	net_warn_ratelimited("cls_u32: dead loop\n");
	return -1;
}

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2
9.09%
Changli Gao
116
14.76%
1
4.55%
Jamal Hadi Salim
86
10.94%
3
13.64%
John Fastabend
51
6.49%
2
9.09%
Catalin(ux aka Dino) M. Boie
37
4.71%
1
4.55%
Stephen Hemminger
25
3.18%
2
9.09%
Thomas Graf
23
2.93%
3
13.64%
Sridhar Samudrala
23
2.93%
1
4.55%
David S. Miller
2
0.25%
1
4.55%
Dan Carpenter
2
0.25%
1
4.55%
Arnaldo Carvalho de Melo
2
0.25%
1
4.55%
Américo Wang
1
0.13%
1
4.55%
Linus Torvalds
1
0.13%
1
4.55%
Eric Dumazet
1
0.13%
1
4.55%
Joe Perches
1
0.13%
1
4.55%
Total
786
100.00%
22
100.00%



static struct tc_u_hnode *u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
{
	struct tc_u_hnode *ht;

	for (ht = rtnl_dereference(tp_c->hlist);
	     ht;
	     ht = rtnl_dereference(ht->next))
		if (ht->handle == handle)
			break;

	return ht;
}

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Linus Torvalds (pre-git)
33
60.00%
1
33.33%
Eric Dumazet
16
29.09%
1
33.33%
John Fastabend
6
10.91%
1
33.33%
Total
55
100.00%
3
100.00%



static struct tc_u_knode *u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
{
	unsigned int sel;
	struct tc_u_knode *n = NULL;

	sel = TC_U32_HASH(handle);
	if (sel > ht->divisor)
		goto out;

	for (n = rtnl_dereference(ht->ht[sel]);
	     n;
	     n = rtnl_dereference(n->next))
		if (n->handle == handle)
			break;
out:
	return n;
}


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Linus Torvalds (pre-git)
68
80.95%
1
25.00%
Arnaldo Carvalho de Melo
8
9.52%
1
25.00%
John Fastabend
6
7.14%
1
25.00%
Eric Dumazet
2
2.38%
1
25.00%
Total
84
100.00%
4
100.00%



static void *u32_get(struct tcf_proto *tp, u32 handle)
{
	struct tc_u_hnode *ht;
	struct tc_u_common *tp_c = tp->data;

	if (TC_U32_HTID(handle) == TC_U32_ROOT)
		ht = rtnl_dereference(tp->root);
	else
		ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));

	if (!ht)
		return NULL;

	if (TC_U32_KEY(handle) == 0)
		return ht;

	return u32_lookup_key(ht, handle);
}

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82
93.18%
1
33.33%
Américo Wang
3
3.41%
1
33.33%
John Fastabend
3
3.41%
1
33.33%
Total
88
100.00%
3
100.00%



static u32 gen_new_htid(struct tc_u_common *tp_c)
{
	int i = 0x800;

	/* hgenerator only used inside rtnl lock it is safe to increment
         * without read _copy_ update semantics
         */
	do {
		if (++tp_c->hgenerator == 0x7FF)
			tp_c->hgenerator = 1;
	} while (--i > 0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20));

	return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
}

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73
97.33%
1
33.33%
John Fastabend
1
1.33%
1
33.33%
Linus Torvalds
1
1.33%
1
33.33%
Total
75
100.00%
3
100.00%


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);
}

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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;
}

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100.00%



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 = tc_u_common_find(tp);

	root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
	if (root_ht == NULL)
		return -ENOBUFS;

	root_ht->refcnt++;
	root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000;
	root_ht->prio = tp->prio;

	if (tp_c == NULL) {
		tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
		if (tp_c == NULL) {
			kfree(root_ht);
			return -ENOBUFS;
		}
		tp_c->q = tp->q;
		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++;
	RCU_INIT_POINTER(root_ht->next, tp_c->hlist);
	rcu_assign_pointer(tp_c->hlist, root_ht);
	root_ht->tp_c = tp_c;

	rcu_assign_pointer(tp->root, root_ht);
	tp->data = tp_c;
	return 0;
}

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Linus Torvalds (pre-git)
149
72.68%
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16.67%
Américo Wang
32
15.61%
1
16.67%
John Fastabend
12
5.85%
1
16.67%
Patrick McHardy
8
3.90%
1
16.67%
David S. Miller
2
0.98%
1
16.67%
Panagiotis Issaris
2
0.98%
1
16.67%
Total
205
100.00%
6
100.00%



static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n,
			   bool free_pf)
{
	tcf_exts_destroy(&n->exts);
	tcf_exts_put_net(&n->exts);
	if (n->ht_down)
		n->ht_down->refcnt--;
#ifdef CONFIG_CLS_U32_PERF
	if (free_pf)
		free_percpu(n->pf);
#endif
#ifdef CONFIG_CLS_U32_MARK
	if (free_pf)
		free_percpu(n->pcpu_success);
#endif
	kfree(n);
	return 0;
}

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41
46.59%
1
12.50%
John Fastabend
24
27.27%
3
37.50%
Jamal Hadi Salim
12
13.64%
2
25.00%
Américo Wang
8
9.09%
1
12.50%
Thomas Graf
3
3.41%
1
12.50%
Total
88
100.00%
8
100.00%

/* u32_delete_key_rcu should be called when free'ing a copied
 * version of a tc_u_knode obtained from u32_init_knode(). When
 * copies are obtained from u32_init_knode() the statistics are
 * shared between the old and new copies to allow readers to
 * continue to update the statistics during the copy. To support
 * this the u32_delete_key_rcu variant does not free the percpu
 * statistics.
 */


static void u32_delete_key_work(struct work_struct *work)
{
	struct tc_u_knode *key = container_of(work, struct tc_u_knode, work);

	rtnl_lock();
	u32_destroy_key(key->tp, key, false);
	rtnl_unlock();
}

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100.00%
1
100.00%



static void u32_delete_key_rcu(struct rcu_head *rcu)
{
	struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu);

	INIT_WORK(&key->work, u32_delete_key_work);
	tcf_queue_work(&key->work);
}

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11
25.00%
1
33.33%
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44
100.00%
3
100.00%

/* u32_delete_key_freepf_rcu is the rcu callback variant
 * that free's the entire structure including the statistics
 * percpu variables. Only use this if the key is not a copy
 * returned by u32_init_knode(). See u32_delete_key_rcu()
 * for the variant that should be used with keys return from
 * u32_init_knode()
 */


static void u32_delete_key_freepf_work(struct work_struct *work)
{
	struct tc_u_knode *key = container_of(work, struct tc_u_knode, work);

	rtnl_lock();
	u32_destroy_key(key->tp, key, true);
	rtnl_unlock();
}

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1
100.00%



static void u32_delete_key_freepf_rcu(struct rcu_head *rcu)
{
	struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu);

	INIT_WORK(&key->work, u32_delete_key_freepf_work);
	tcf_queue_work(&key->work);
}

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11
25.00%
1
33.33%
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44
100.00%
3
100.00%



static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key)
{
	struct tc_u_knode __rcu **kp;
	struct tc_u_knode *pkp;
	struct tc_u_hnode *ht = rtnl_dereference(key->ht_up);

	if (ht) {
		kp = &ht->ht[TC_U32_HASH(key->handle)];
		for (pkp = rtnl_dereference(*kp); pkp;
		     kp = &pkp->next, pkp = rtnl_dereference(*kp)) {
			if (pkp == key) {
				RCU_INIT_POINTER(*kp, key->next);

				tcf_unbind_filter(tp, &key->res);
				tcf_exts_get_net(&key->exts);
				call_rcu(&key->rcu, u32_delete_key_freepf_rcu);
				return 0;
			}
		}
	}
	WARN_ON(1);
	return 0;
}

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Linus Torvalds (pre-git)
90
61.22%
3
33.33%
John Fastabend
37
25.17%
3
33.33%
Américo Wang
18
12.24%
2
22.22%
Ilpo Järvinen
2
1.36%
1
11.11%
Total
147
100.00%
9
100.00%



static void u32_remove_hw_knode(struct tcf_proto *tp, u32 handle)
{
	struct net_device *dev = tp->q->dev_queue->dev;
	struct tc_cls_u32_offload cls_u32 = {};

	if (!tc_should_offload(dev, 0))
		return;

	tc_cls_common_offload_init(&cls_u32.common, tp);
	cls_u32.command = TC_CLSU32_DELETE_KNODE;
	cls_u32.knode.handle = handle;

	dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_CLSU32, &cls_u32);
}

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19
23.17%
3
50.00%
Total
82
100.00%
6
100.00%



static int u32_replace_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h,
				u32 flags)
{
	struct net_device *dev = tp->q->dev_queue->dev;
	struct tc_cls_u32_offload cls_u32 = {};
	int err;

	if (!tc_should_offload(dev, flags))
		return tc_skip_sw(flags) ? -EINVAL : 0;

	tc_cls_common_offload_init(&cls_u32.common, tp);
	cls_u32.command = TC_CLSU32_NEW_HNODE;
	cls_u32.hnode.divisor = h->divisor;
	cls_u32.hnode.handle = h->handle;
	cls_u32.hnode.prio = h->prio;

	err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_CLSU32, &cls_u32);
	if (tc_skip_sw(flags))
		return err;

	return 0;
}

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78
56.93%
2
28.57%
Jakub Kiciński
21
15.33%
1
14.29%
Jiri Pirko
19
13.87%
3
42.86%
Sridhar Samudrala
19
13.87%
1
14.29%
Total
137
100.00%
7
100.00%



static void u32_clear_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h)
{
	struct net_device *dev = tp->q->dev_queue->dev;
	struct tc_cls_u32_offload cls_u32 = {};

	if (!tc_should_offload(dev, 0))
		return;

	tc_cls_common_offload_init(&cls_u32.common, tp);
	cls_u32.command = TC_CLSU32_DELETE_HNODE;
	cls_u32.hnode.divisor = h->divisor;
	cls_u32.hnode.handle = h->handle;
	cls_u32.hnode.prio = h->prio;

	dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_CLSU32, &cls_u32);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
John Fastabend
85
80.19%
3
50.00%
Jiri Pirko
21
19.81%
3
50.00%
Total
106
100.00%
6
100.00%



static int u32_replace_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n,
				u32 flags)
{
	struct net_device *dev = tp->q->dev_queue->dev;
	struct tc_cls_u32_offload cls_u32 = {};
	int err;

	if (!tc_should_offload(dev, flags))
		return tc_skip_sw(flags) ? -EINVAL : 0;

	tc_cls_common_offload_init(&cls_u32.common, tp);
	cls_u32.command = TC_CLSU32_REPLACE_KNODE;
	cls_u32.knode.handle = n->handle;
	cls_u32.knode.fshift = n->fshift;
#ifdef CONFIG_CLS_U32_MARK
	cls_u32.knode.val = n->val;
	cls_u32.knode.mask = n->mask;
#else
	cls_u32.knode.val = 0;
	cls_u32.knode.mask = 0;
#endif
	cls_u32.knode.sel = &n->sel;
	cls_u32.knode.exts = &n->exts;
	if (n->ht_down)
		cls_u32.knode.link_handle = n->ht_down->handle;

	err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_CLSU32, &cls_u32);

	if (!err)
		n->flags |= TCA_CLS_FLAGS_IN_HW;

	if (tc_skip_sw(flags))
		return err;

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
John Fastabend
154
69.68%
3
33.33%
Jiri Pirko
25
11.31%
3
33.33%
Sridhar Samudrala
19
8.60%
1
11.11%
Jakub Kiciński
12
5.43%
1
11.11%
Or Gerlitz
11
4.98%
1
11.11%
Total
221
100.00%
9
100.00%



static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
{
	struct tc_u_knode *n;
	unsigned int h;

	for (h = 0; h <= ht->divisor; h++) {
		while ((n = rtnl_dereference(ht->ht[h])) != NULL) {
			RCU_INIT_POINTER(ht->ht[h],
					 rtnl_dereference(n->next));
			tcf_unbind_filter(tp, &n->res);
			u32_remove_hw_knode(tp, n->handle);
			if (tcf_exts_get_net(&n->exts))
				call_rcu(&n->rcu, u32_delete_key_freepf_rcu);
			else
				u32_destroy_key(n->tp, n, true);
		}
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
67
51.54%
1
14.29%
Américo Wang
37
28.46%
2
28.57%
John Fastabend
25
19.23%
3
42.86%
Eric Dumazet
1
0.77%
1
14.29%
Total
130
100.00%
7
100.00%



static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
{
	struct tc_u_common *tp_c = tp->data;
	struct tc_u_hnode __rcu **hn;
	struct tc_u_hnode *phn;

	WARN_ON(ht->refcnt);

	u32_clear_hnode(tp, ht);

	hn = &tp_c->hlist;
	for (phn = rtnl_dereference(*hn);
	     phn;
	     hn = &phn->next, phn = rtnl_dereference(*hn)) {
		if (phn == ht) {
			u32_clear_hw_hnode(tp, ht);
			RCU_INIT_POINTER(*hn, ht->next);
			kfree_rcu(ht, rcu);
			return 0;
		}
	}

	return -ENOENT;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
83
65.87%
1
20.00%
John Fastabend
40
31.75%
2
40.00%
Américo Wang
2
1.59%
1
20.00%
Ilpo Järvinen
1
0.79%
1
20.00%
Total
126
100.00%
5
100.00%



static bool ht_empty(struct tc_u_hnode *ht)
{
	unsigned int h;

	for (h = 0; h <= ht->divisor; h++)
		if (rcu_access_pointer(ht->ht[h]))
			return false;

	return true;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Cong Wang
48
100.00%
1
100.00%
Total
48
100.00%
1
100.00%



static void u32_destroy(struct tcf_proto *tp)
{
	struct tc_u_common *tp_c = tp->data;
	struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);

	WARN_ON(root_ht == NULL);

	if (root_ht && --root_ht->refcnt == 0)
		u32_destroy_hnode(tp, root_ht);

	if (--tp_c->refcnt == 0) {
		struct tc_u_hnode *ht;

		hlist_del(&tp_c->hnode);

		for (ht = rtnl_dereference(tp_c->hlist);
		     ht;