[mirror_ubuntu-artful-kernel.git] / include / net / sch_generic.h

#ifndef __NET_SCHED_GENERIC_H
#define __NET_SCHED_GENERIC_H

#include <linux/netdevice.h>
#include <linux/types.h>
#include <linux/rcupdate.h>
#include <linux/module.h>
#include <linux/pkt_sched.h>
#include <linux/pkt_cls.h>
#include <net/gen_stats.h>
#include <net/rtnetlink.h>

struct Qdisc_ops;
struct qdisc_walker;
struct tcf_walker;
struct module;

struct qdisc_rate_table {
	struct tc_ratespec rate;
	u32		data[256];
	struct qdisc_rate_table *next;
	int		refcnt;
};

enum qdisc_state_t {
	__QDISC_STATE_SCHED,
	__QDISC_STATE_DEACTIVATED,
};

/*
 * following bits are only changed while qdisc lock is held
 */
enum qdisc___state_t {
	__QDISC___STATE_RUNNING = 1,
	__QDISC___STATE_THROTTLED = 2,
};

struct qdisc_size_table {
	struct rcu_head		rcu;
	struct list_head	list;
	struct tc_sizespec	szopts;
	int			refcnt;
	u16			data[];
};

struct Qdisc {
	int 			(*enqueue)(struct sk_buff *skb, struct Qdisc *dev);
	struct sk_buff *	(*dequeue)(struct Qdisc *dev);
	unsigned		flags;
#define TCQ_F_BUILTIN		1
#define TCQ_F_INGRESS		2
#define TCQ_F_CAN_BYPASS	4
#define TCQ_F_MQROOT		8
#define TCQ_F_WARN_NONWC	(1 << 16)
	int			padded;
	struct Qdisc_ops	*ops;
	struct qdisc_size_table	__rcu *stab;
	struct list_head	list;
	u32			handle;
	u32			parent;
	atomic_t		refcnt;
	struct gnet_stats_rate_est	rate_est;
	int			(*reshape_fail)(struct sk_buff *skb,
					struct Qdisc *q);

	void			*u32_node;

	/* This field is deprecated, but it is still used by CBQ
	 * and it will live until better solution will be invented.
	 */
	struct Qdisc		*__parent;
	struct netdev_queue	*dev_queue;
	struct Qdisc		*next_sched;

	struct sk_buff		*gso_skb;
	/*
	 * For performance sake on SMP, we put highly modified fields at the end
	 */
	unsigned long		state;
	struct sk_buff_head	q;
	struct gnet_stats_basic_packed bstats;
	unsigned int		__state;
	struct gnet_stats_queue	qstats;
	struct rcu_head		rcu_head;
	spinlock_t		busylock;
};

static inline bool qdisc_is_running(const struct Qdisc *qdisc)
{
	return (qdisc->__state & __QDISC___STATE_RUNNING) ? true : false;
}

static inline bool qdisc_run_begin(struct Qdisc *qdisc)
{
	if (qdisc_is_running(qdisc))
		return false;
	qdisc->__state |= __QDISC___STATE_RUNNING;
	return true;
}

static inline void qdisc_run_end(struct Qdisc *qdisc)
{
	qdisc->__state &= ~__QDISC___STATE_RUNNING;
}

static inline bool qdisc_is_throttled(const struct Qdisc *qdisc)
{
	return (qdisc->__state & __QDISC___STATE_THROTTLED) ? true : false;
}

static inline void qdisc_throttled(struct Qdisc *qdisc)
{
	qdisc->__state |= __QDISC___STATE_THROTTLED;
}

static inline void qdisc_unthrottled(struct Qdisc *qdisc)
{
	qdisc->__state &= ~__QDISC___STATE_THROTTLED;
}

struct Qdisc_class_ops {
	/* Child qdisc manipulation */
	struct netdev_queue *	(*select_queue)(struct Qdisc *, struct tcmsg *);
	int			(*graft)(struct Qdisc *, unsigned long cl,
					struct Qdisc *, struct Qdisc **);
	struct Qdisc *		(*leaf)(struct Qdisc *, unsigned long cl);
	void			(*qlen_notify)(struct Qdisc *, unsigned long);

	/* Class manipulation routines */
	unsigned long		(*get)(struct Qdisc *, u32 classid);
	void			(*put)(struct Qdisc *, unsigned long);
	int			(*change)(struct Qdisc *, u32, u32,
					struct nlattr **, unsigned long *);
	int			(*delete)(struct Qdisc *, unsigned long);
	void			(*walk)(struct Qdisc *, struct qdisc_walker * arg);

	/* Filter manipulation */
	struct tcf_proto **	(*tcf_chain)(struct Qdisc *, unsigned long);
	unsigned long		(*bind_tcf)(struct Qdisc *, unsigned long,
					u32 classid);
	void			(*unbind_tcf)(struct Qdisc *, unsigned long);

	/* rtnetlink specific */
	int			(*dump)(struct Qdisc *, unsigned long,
					struct sk_buff *skb, struct tcmsg*);
	int			(*dump_stats)(struct Qdisc *, unsigned long,
					struct gnet_dump *);
};

struct Qdisc_ops {
	struct Qdisc_ops	*next;
	const struct Qdisc_class_ops	*cl_ops;
	char			id[IFNAMSIZ];
	int			priv_size;

	int 			(*enqueue)(struct sk_buff *, struct Qdisc *);
	struct sk_buff *	(*dequeue)(struct Qdisc *);
	struct sk_buff *	(*peek)(struct Qdisc *);
	unsigned int		(*drop)(struct Qdisc *);

	int			(*init)(struct Qdisc *, struct nlattr *arg);
	void			(*reset)(struct Qdisc *);
	void			(*destroy)(struct Qdisc *);
	int			(*change)(struct Qdisc *, struct nlattr *arg);
	void			(*attach)(struct Qdisc *);

	int			(*dump)(struct Qdisc *, struct sk_buff *);
	int			(*dump_stats)(struct Qdisc *, struct gnet_dump *);

	struct module		*owner;
};


struct tcf_result {
	unsigned long	class;
	u32		classid;
};

struct tcf_proto_ops {
	struct tcf_proto_ops	*next;
	char			kind[IFNAMSIZ];

	int			(*classify)(struct sk_buff*, struct tcf_proto*,
					struct tcf_result *);
	int			(*init)(struct tcf_proto*);
	void			(*destroy)(struct tcf_proto*);

	unsigned long		(*get)(struct tcf_proto*, u32 handle);
	void			(*put)(struct tcf_proto*, unsigned long);
	int			(*change)(struct tcf_proto*, unsigned long,
					u32 handle, struct nlattr **,
					unsigned long *);
	int			(*delete)(struct tcf_proto*, unsigned long);
	void			(*walk)(struct tcf_proto*, struct tcf_walker *arg);

	/* rtnetlink specific */
	int			(*dump)(struct tcf_proto*, unsigned long,
					struct sk_buff *skb, struct tcmsg*);

	struct module		*owner;
};

struct tcf_proto {
	/* Fast access part */
	struct tcf_proto	*next;
	void			*root;
	int			(*classify)(struct sk_buff*, struct tcf_proto*,
					struct tcf_result *);
	__be16			protocol;

	/* All the rest */
	u32			prio;
	u32			classid;
	struct Qdisc		*q;
	void			*data;
	struct tcf_proto_ops	*ops;
};

struct qdisc_skb_cb {
	unsigned int		pkt_len;
	char			data[];
};

static inline int qdisc_qlen(struct Qdisc *q)
{
	return q->q.qlen;
}

static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
{
	return (struct qdisc_skb_cb *)skb->cb;
}

static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
{
	return &qdisc->q.lock;
}

static inline struct Qdisc *qdisc_root(struct Qdisc *qdisc)
{
	return qdisc->dev_queue->qdisc;
}

static inline struct Qdisc *qdisc_root_sleeping(struct Qdisc *qdisc)
{
	return qdisc->dev_queue->qdisc_sleeping;
}

/* The qdisc root lock is a mechanism by which to top level
 * of a qdisc tree can be locked from any qdisc node in the
 * forest.  This allows changing the configuration of some
 * aspect of the qdisc tree while blocking out asynchronous
 * qdisc access in the packet processing paths.
 *
 * It is only legal to do this when the root will not change
 * on us.  Otherwise we'll potentially lock the wrong qdisc
 * root.  This is enforced by holding the RTNL semaphore, which
 * all users of this lock accessor must do.
 */
static inline spinlock_t *qdisc_root_lock(struct Qdisc *qdisc)
{
	struct Qdisc *root = qdisc_root(qdisc);

	ASSERT_RTNL();
	return qdisc_lock(root);
}

static inline spinlock_t *qdisc_root_sleeping_lock(struct Qdisc *qdisc)
{
	struct Qdisc *root = qdisc_root_sleeping(qdisc);

	ASSERT_RTNL();
	return qdisc_lock(root);
}

static inline struct net_device *qdisc_dev(struct Qdisc *qdisc)
{
	return qdisc->dev_queue->dev;
}

static inline void sch_tree_lock(struct Qdisc *q)
{
	spin_lock_bh(qdisc_root_sleeping_lock(q));
}

static inline void sch_tree_unlock(struct Qdisc *q)
{
	spin_unlock_bh(qdisc_root_sleeping_lock(q));
}

#define tcf_tree_lock(tp)	sch_tree_lock((tp)->q)
#define tcf_tree_unlock(tp)	sch_tree_unlock((tp)->q)

extern struct Qdisc noop_qdisc;
extern struct Qdisc_ops noop_qdisc_ops;
extern struct Qdisc_ops pfifo_fast_ops;
extern struct Qdisc_ops mq_qdisc_ops;

struct Qdisc_class_common {
	u32			classid;
	struct hlist_node	hnode;
};

struct Qdisc_class_hash {
	struct hlist_head	*hash;
	unsigned int		hashsize;
	unsigned int		hashmask;
	unsigned int		hashelems;
};

static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
{
	id ^= id >> 8;
	id ^= id >> 4;
	return id & mask;
}

static inline struct Qdisc_class_common *
qdisc_class_find(struct Qdisc_class_hash *hash, u32 id)
{
	struct Qdisc_class_common *cl;
	struct hlist_node *n;
	unsigned int h;

	h = qdisc_class_hash(id, hash->hashmask);
	hlist_for_each_entry(cl, n, &hash->hash[h], hnode) {
		if (cl->classid == id)
			return cl;
	}
	return NULL;
}

extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
extern void qdisc_class_hash_insert(struct Qdisc_class_hash *, struct Qdisc_class_common *);
extern void qdisc_class_hash_remove(struct Qdisc_class_hash *, struct Qdisc_class_common *);
extern void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);

extern void dev_init_scheduler(struct net_device *dev);
extern void dev_shutdown(struct net_device *dev);
extern void dev_activate(struct net_device *dev);
extern void dev_deactivate(struct net_device *dev);
extern void dev_deactivate_many(struct list_head *head);
extern struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
				     struct Qdisc *qdisc);
extern void qdisc_reset(struct Qdisc *qdisc);
extern void qdisc_destroy(struct Qdisc *qdisc);
extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
extern struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
				 struct Qdisc_ops *ops);
extern struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
				       struct Qdisc_ops *ops, u32 parentid);
extern void __qdisc_calculate_pkt_len(struct sk_buff *skb,
				      const struct qdisc_size_table *stab);
extern void tcf_destroy(struct tcf_proto *tp);
extern void tcf_destroy_chain(struct tcf_proto **fl);

/* Reset all TX qdiscs greater then index of a device.  */
static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
{
	struct Qdisc *qdisc;

	for (; i < dev->num_tx_queues; i++) {
		qdisc = netdev_get_tx_queue(dev, i)->qdisc;
		if (qdisc) {
			spin_lock_bh(qdisc_lock(qdisc));
			qdisc_reset(qdisc);
			spin_unlock_bh(qdisc_lock(qdisc));
		}
	}
}

static inline void qdisc_reset_all_tx(struct net_device *dev)
{
	qdisc_reset_all_tx_gt(dev, 0);
}

/* Are all TX queues of the device empty?  */
static inline bool qdisc_all_tx_empty(const struct net_device *dev)
{
	unsigned int i;
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
		const struct Qdisc *q = txq->qdisc;

		if (q->q.qlen)
			return false;
	}
	return true;
}

/* Are any of the TX qdiscs changing?  */
static inline bool qdisc_tx_changing(struct net_device *dev)
{
	unsigned int i;
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
		if (txq->qdisc != txq->qdisc_sleeping)
			return true;
	}
	return false;
}

/* Is the device using the noop qdisc on all queues?  */
static inline bool qdisc_tx_is_noop(const struct net_device *dev)
{
	unsigned int i;
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
		if (txq->qdisc != &noop_qdisc)
			return false;
	}
	return true;
}

static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
{
	return qdisc_skb_cb(skb)->pkt_len;
}

/* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
enum net_xmit_qdisc_t {
	__NET_XMIT_STOLEN = 0x00010000,
	__NET_XMIT_BYPASS = 0x00020000,
};

#ifdef CONFIG_NET_CLS_ACT
#define net_xmit_drop_count(e)	((e) & __NET_XMIT_STOLEN ? 0 : 1)
#else
#define net_xmit_drop_count(e)	(1)
#endif

static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
					   const struct Qdisc *sch)
{
#ifdef CONFIG_NET_SCHED
	struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);

	if (stab)
		__qdisc_calculate_pkt_len(skb, stab);
#endif
}

static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
{
	qdisc_calculate_pkt_len(skb, sch);
	return sch->enqueue(skb, sch);
}

static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch)
{
	qdisc_skb_cb(skb)->pkt_len = skb->len;
	return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
}


static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
				 const struct sk_buff *skb)
{
	bstats->bytes += qdisc_pkt_len(skb);
	bstats->packets += skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1;
}

static inline void qdisc_bstats_update(struct Qdisc *sch,
				       const struct sk_buff *skb)
{
	bstats_update(&sch->bstats, skb);
}

static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
				       struct sk_buff_head *list)
{
	__skb_queue_tail(list, skb);
	sch->qstats.backlog += qdisc_pkt_len(skb);
	qdisc_bstats_update(sch, skb);

	return NET_XMIT_SUCCESS;
}

static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
{
	return __qdisc_enqueue_tail(skb, sch, &sch->q);
}

static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
						   struct sk_buff_head *list)
{
	struct sk_buff *skb = __skb_dequeue(list);

	if (likely(skb != NULL))
		sch->qstats.backlog -= qdisc_pkt_len(skb);

	return skb;
}

static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
{
	return __qdisc_dequeue_head(sch, &sch->q);
}

static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
					      struct sk_buff_head *list)
{
	struct sk_buff *skb = __qdisc_dequeue_head(sch, list);

	if (likely(skb != NULL)) {
		unsigned int len = qdisc_pkt_len(skb);
		kfree_skb(skb);
		return len;
	}

	return 0;
}

static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch)
{
	return __qdisc_queue_drop_head(sch, &sch->q);
}

static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
						   struct sk_buff_head *list)
{
	struct sk_buff *skb = __skb_dequeue_tail(list);

	if (likely(skb != NULL))
		sch->qstats.backlog -= qdisc_pkt_len(skb);

	return skb;
}

static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
{
	return __qdisc_dequeue_tail(sch, &sch->q);
}

static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
{
	return skb_peek(&sch->q);
}

/* generic pseudo peek method for non-work-conserving qdisc */
static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
{
	/* we can reuse ->gso_skb because peek isn't called for root qdiscs */
	if (!sch->gso_skb) {
		sch->gso_skb = sch->dequeue(sch);
		if (sch->gso_skb)
			/* it's still part of the queue */
			sch->q.qlen++;
	}

	return sch->gso_skb;
}

/* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
{
	struct sk_buff *skb = sch->gso_skb;

	if (skb) {
		sch->gso_skb = NULL;
		sch->q.qlen--;
	} else {
		skb = sch->dequeue(sch);
	}

	return skb;
}

static inline void __qdisc_reset_queue(struct Qdisc *sch,
				       struct sk_buff_head *list)
{
	/*
	 * We do not know the backlog in bytes of this list, it
	 * is up to the caller to correct it
	 */
	__skb_queue_purge(list);
}

static inline void qdisc_reset_queue(struct Qdisc *sch)
{
	__qdisc_reset_queue(sch, &sch->q);
	sch->qstats.backlog = 0;
}

static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
					      struct sk_buff_head *list)
{
	struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);

	if (likely(skb != NULL)) {
		unsigned int len = qdisc_pkt_len(skb);
		kfree_skb(skb);
		return len;
	}

	return 0;
}

static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
{
	return __qdisc_queue_drop(sch, &sch->q);
}

static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
{
	kfree_skb(skb);
	sch->qstats.drops++;

	return NET_XMIT_DROP;
}

static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
{
	sch->qstats.drops++;

#ifdef CONFIG_NET_CLS_ACT
	if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
		goto drop;

	return NET_XMIT_SUCCESS;

drop:
#endif
	kfree_skb(skb);
	return NET_XMIT_DROP;
}

/* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
   long it will take to send a packet given its size.
 */
static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
{
	int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
	if (slot < 0)
		slot = 0;
	slot >>= rtab->rate.cell_log;
	if (slot > 255)
		return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
	return rtab->data[slot];
}

#ifdef CONFIG_NET_CLS_ACT
static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask,
					    int action)
{
	struct sk_buff *n;

	n = skb_clone(skb, gfp_mask);

	if (n) {
		n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
		n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
		n->tc_verd = CLR_TC_MUNGED(n->tc_verd);
	}
	return n;
}
#endif

#endif
Commit	Line	Data
1da177e4 LT	1	#ifndef __NET_SCHED_GENERIC_H
	2	#define __NET_SCHED_GENERIC_H
	3
1da177e4 LT	4	#include <linux/netdevice.h>
	5	#include <linux/types.h>
	6	#include <linux/rcupdate.h>
	7	#include <linux/module.h>
1da177e4 LT	8	#include <linux/pkt_sched.h>
	9	#include <linux/pkt_cls.h>
	10	#include <net/gen_stats.h>
be577ddc	11	#include <net/rtnetlink.h>
1da177e4 LT	12
	13	struct Qdisc_ops;
	14	struct qdisc_walker;
	15	struct tcf_walker;
	16	struct module;
	17
fd2c3ef7	18	struct qdisc_rate_table {
1da177e4 LT	19	struct tc_ratespec rate;
	20	u32 data[256];
	21	struct qdisc_rate_table *next;
	22	int refcnt;
	23	};
	24
fd2c3ef7	25	enum qdisc_state_t {
37437bb2	26	__QDISC_STATE_SCHED,
a9312ae8	27	__QDISC_STATE_DEACTIVATED,
e2627c8c DM	28	};
e2627c8c DM	29
37112105 ED	30	/*
	31	* following bits are only changed while qdisc lock is held
	32	*/
	33	enum qdisc___state_t {
fd245a4a ED	34	__QDISC___STATE_RUNNING = 1,
fd245a4a ED	35	__QDISC___STATE_THROTTLED = 2,
37112105 ED	36	};
37112105 ED	37
175f9c1b	38	struct qdisc_size_table {
a2da570d	39	struct rcu_head rcu;
175f9c1b JK	40	struct list_head list;
	41	struct tc_sizespec szopts;
	42	int refcnt;
	43	u16 data[];
	44	};
	45
fd2c3ef7	46	struct Qdisc {
1da177e4 LT	47	int (enqueue)(struct sk_buff skb, struct Qdisc *dev);
	48	struct sk_buff * (dequeue)(struct Qdisc dev);
	49	unsigned flags;
b00355db	50	#define TCQ_F_BUILTIN 1
fd245a4a ED	51	#define TCQ_F_INGRESS 2
	52	#define TCQ_F_CAN_BYPASS 4
	53	#define TCQ_F_MQROOT 8
b00355db	54	#define TCQ_F_WARN_NONWC (1 << 16)
1da177e4 LT	55	int padded;
1da177e4 LT	56	struct Qdisc_ops *ops;
a2da570d	57	struct qdisc_size_table __rcu *stab;
5e140dfc	58	struct list_head list;
1da177e4 LT	59	u32 handle;
	60	u32 parent;
	61	atomic_t refcnt;
1da177e4	62	struct gnet_stats_rate_est rate_est;
1da177e4 LT	63	int (reshape_fail)(struct sk_buff skb,
	64	struct Qdisc *q);
	65
72b25a91 DM	66	void *u32_node;
72b25a91 DM	67
1da177e4 LT	68	/* This field is deprecated, but it is still used by CBQ
	69	* and it will live until better solution will be invented.
	70	*/
	71	struct Qdisc *__parent;
5e140dfc ED	72	struct netdev_queue *dev_queue;
	73	struct Qdisc *next_sched;
	74
	75	struct sk_buff *gso_skb;
	76	/*
	77	* For performance sake on SMP, we put highly modified fields at the end
	78	*/
	79	unsigned long state;
	80	struct sk_buff_head q;
c1a8f1f1	81	struct gnet_stats_basic_packed bstats;
fd245a4a	82	unsigned int __state;
5e140dfc	83	struct gnet_stats_queue qstats;
79640a4c ED	84	struct rcu_head rcu_head;
79640a4c ED	85	spinlock_t busylock;
1da177e4 LT	86	};
1da177e4 LT	87
fd245a4a	88	static inline bool qdisc_is_running(const struct Qdisc *qdisc)
bc135b23	89	{
fd245a4a	90	return (qdisc->__state & __QDISC___STATE_RUNNING) ? true : false;
bc135b23 ED	91	}
	92
	93	static inline bool qdisc_run_begin(struct Qdisc *qdisc)
	94	{
fd245a4a ED	95	if (qdisc_is_running(qdisc))
	96	return false;
	97	qdisc->__state \|= __QDISC___STATE_RUNNING;
	98	return true;
bc135b23 ED	99	}
	100
	101	static inline void qdisc_run_end(struct Qdisc *qdisc)
	102	{
fd245a4a ED	103	qdisc->__state &= ~__QDISC___STATE_RUNNING;
	104	}
	105
	106	static inline bool qdisc_is_throttled(const struct Qdisc *qdisc)
	107	{
	108	return (qdisc->__state & __QDISC___STATE_THROTTLED) ? true : false;
	109	}
	110
	111	static inline void qdisc_throttled(struct Qdisc *qdisc)
	112	{
	113	qdisc->__state \|= __QDISC___STATE_THROTTLED;
	114	}
	115
	116	static inline void qdisc_unthrottled(struct Qdisc *qdisc)
	117	{
	118	qdisc->__state &= ~__QDISC___STATE_THROTTLED;
bc135b23 ED	119	}
bc135b23 ED	120
fd2c3ef7	121	struct Qdisc_class_ops {
1da177e4	122	/* Child qdisc manipulation */
926e61b7	123	struct netdev_queue * (select_queue)(struct Qdisc , struct tcmsg *);
1da177e4 LT	124	int (graft)(struct Qdisc , unsigned long cl,
	125	struct Qdisc , struct Qdisc *);
	126	struct Qdisc * (leaf)(struct Qdisc , unsigned long cl);
43effa1e	127	void (qlen_notify)(struct Qdisc , unsigned long);
1da177e4 LT	128
	129	/* Class manipulation routines */
	130	unsigned long (get)(struct Qdisc , u32 classid);
	131	void (put)(struct Qdisc , unsigned long);
	132	int (change)(struct Qdisc , u32, u32,
1e90474c	133	struct nlattr *, unsigned long );
1da177e4 LT	134	int (delete)(struct Qdisc , unsigned long);
	135	void (walk)(struct Qdisc , struct qdisc_walker * arg);
	136
	137	/* Filter manipulation */
	138	struct tcf_proto ** (tcf_chain)(struct Qdisc , unsigned long);
	139	unsigned long (bind_tcf)(struct Qdisc , unsigned long,
	140	u32 classid);
	141	void (unbind_tcf)(struct Qdisc , unsigned long);
	142
	143	/* rtnetlink specific */
	144	int (dump)(struct Qdisc , unsigned long,
	145	struct sk_buff skb, struct tcmsg);
	146	int (dump_stats)(struct Qdisc , unsigned long,
	147	struct gnet_dump *);
	148	};
	149
fd2c3ef7	150	struct Qdisc_ops {
1da177e4	151	struct Qdisc_ops *next;
20fea08b	152	const struct Qdisc_class_ops *cl_ops;
1da177e4 LT	153	char id[IFNAMSIZ];
	154	int priv_size;
	155
	156	int (enqueue)(struct sk_buff , struct Qdisc *);
	157	struct sk_buff * (dequeue)(struct Qdisc );
90d841fd	158	struct sk_buff * (peek)(struct Qdisc );
1da177e4 LT	159	unsigned int (drop)(struct Qdisc );
1da177e4 LT	160
1e90474c	161	int (init)(struct Qdisc , struct nlattr *arg);
1da177e4 LT	162	void (reset)(struct Qdisc );
1da177e4 LT	163	void (destroy)(struct Qdisc );
1e90474c	164	int (change)(struct Qdisc , struct nlattr *arg);
6ec1c69a	165	void (attach)(struct Qdisc );
1da177e4 LT	166
	167	int (dump)(struct Qdisc , struct sk_buff *);
	168	int (dump_stats)(struct Qdisc , struct gnet_dump *);
	169
	170	struct module *owner;
	171	};
	172
	173
fd2c3ef7	174	struct tcf_result {
1da177e4 LT	175	unsigned long class;
	176	u32 classid;
	177	};
	178
fd2c3ef7	179	struct tcf_proto_ops {
1da177e4 LT	180	struct tcf_proto_ops *next;
	181	char kind[IFNAMSIZ];
	182
	183	int (classify)(struct sk_buff, struct tcf_proto*,
	184	struct tcf_result *);
	185	int (init)(struct tcf_proto);
	186	void (destroy)(struct tcf_proto);
	187
	188	unsigned long (get)(struct tcf_proto, u32 handle);
	189	void (put)(struct tcf_proto, unsigned long);
	190	int (change)(struct tcf_proto, unsigned long,
add93b61	191	u32 handle, struct nlattr **,
1da177e4 LT	192	unsigned long *);
	193	int (delete)(struct tcf_proto, unsigned long);
	194	void (walk)(struct tcf_proto, struct tcf_walker *arg);
	195
	196	/* rtnetlink specific */
	197	int (dump)(struct tcf_proto, unsigned long,
	198	struct sk_buff skb, struct tcmsg);
	199
	200	struct module *owner;
	201	};
	202
fd2c3ef7	203	struct tcf_proto {
1da177e4 LT	204	/* Fast access part */
	205	struct tcf_proto *next;
	206	void *root;
	207	int (classify)(struct sk_buff, struct tcf_proto*,
	208	struct tcf_result *);
66c6f529	209	__be16 protocol;
1da177e4 LT	210
	211	/* All the rest */
	212	u32 prio;
	213	u32 classid;
	214	struct Qdisc *q;
	215	void *data;
	216	struct tcf_proto_ops *ops;
	217	};
	218
175f9c1b JK	219	struct qdisc_skb_cb {
	220	unsigned int pkt_len;
	221	char data[];
	222	};
	223
bbd8a0d3 KK	224	static inline int qdisc_qlen(struct Qdisc *q)
	225	{
	226	return q->q.qlen;
	227	}
	228
bfe0d029	229	static inline struct qdisc_skb_cb qdisc_skb_cb(const struct sk_buff skb)
175f9c1b JK	230	{
	231	return (struct qdisc_skb_cb *)skb->cb;
	232	}
	233
83874000 DM	234	static inline spinlock_t qdisc_lock(struct Qdisc qdisc)
	235	{
	236	return &qdisc->q.lock;
	237	}
	238
7698b4fc DM	239	static inline struct Qdisc qdisc_root(struct Qdisc qdisc)
	240	{
	241	return qdisc->dev_queue->qdisc;
	242	}
	243
2540e051 JP	244	static inline struct Qdisc qdisc_root_sleeping(struct Qdisc qdisc)
	245	{
	246	return qdisc->dev_queue->qdisc_sleeping;
	247	}
	248
7e43f112 DM	249	/* The qdisc root lock is a mechanism by which to top level
	250	* of a qdisc tree can be locked from any qdisc node in the
	251	* forest. This allows changing the configuration of some
	252	* aspect of the qdisc tree while blocking out asynchronous
	253	* qdisc access in the packet processing paths.
	254	*
	255	* It is only legal to do this when the root will not change
	256	* on us. Otherwise we'll potentially lock the wrong qdisc
	257	* root. This is enforced by holding the RTNL semaphore, which
	258	* all users of this lock accessor must do.
	259	*/
7698b4fc DM	260	static inline spinlock_t qdisc_root_lock(struct Qdisc qdisc)
	261	{
	262	struct Qdisc *root = qdisc_root(qdisc);
	263
7e43f112	264	ASSERT_RTNL();
83874000	265	return qdisc_lock(root);
7698b4fc DM	266	}
7698b4fc DM	267
f6f9b93f JP	268	static inline spinlock_t qdisc_root_sleeping_lock(struct Qdisc qdisc)
	269	{
	270	struct Qdisc *root = qdisc_root_sleeping(qdisc);
	271
	272	ASSERT_RTNL();
	273	return qdisc_lock(root);
	274	}
	275
5ce2d488 DM	276	static inline struct net_device qdisc_dev(struct Qdisc qdisc)
	277	{
	278	return qdisc->dev_queue->dev;
	279	}
1da177e4	280
78a5b30b DM	281	static inline void sch_tree_lock(struct Qdisc *q)
78a5b30b DM	282	{
fe439dd0	283	spin_lock_bh(qdisc_root_sleeping_lock(q));
78a5b30b DM	284	}
	285
	286	static inline void sch_tree_unlock(struct Qdisc *q)
	287	{
fe439dd0	288	spin_unlock_bh(qdisc_root_sleeping_lock(q));
78a5b30b DM	289	}
	290
	291	#define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
	292	#define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
1da177e4	293
e41a33e6 TG	294	extern struct Qdisc noop_qdisc;
e41a33e6 TG	295	extern struct Qdisc_ops noop_qdisc_ops;
6ec1c69a DM	296	extern struct Qdisc_ops pfifo_fast_ops;
6ec1c69a DM	297	extern struct Qdisc_ops mq_qdisc_ops;
e41a33e6	298
fd2c3ef7	299	struct Qdisc_class_common {
6fe1c7a5 PM	300	u32 classid;
	301	struct hlist_node hnode;
	302	};
	303
fd2c3ef7	304	struct Qdisc_class_hash {
6fe1c7a5 PM	305	struct hlist_head *hash;
	306	unsigned int hashsize;
	307	unsigned int hashmask;
	308	unsigned int hashelems;
	309	};
	310
	311	static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
	312	{
	313	id ^= id >> 8;
	314	id ^= id >> 4;
	315	return id & mask;
	316	}
	317
	318	static inline struct Qdisc_class_common *
	319	qdisc_class_find(struct Qdisc_class_hash *hash, u32 id)
	320	{
	321	struct Qdisc_class_common *cl;
	322	struct hlist_node *n;
	323	unsigned int h;
	324
	325	h = qdisc_class_hash(id, hash->hashmask);
	326	hlist_for_each_entry(cl, n, &hash->hash[h], hnode) {
	327	if (cl->classid == id)
	328	return cl;
	329	}
	330	return NULL;
	331	}
	332
	333	extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
	334	extern void qdisc_class_hash_insert(struct Qdisc_class_hash , struct Qdisc_class_common );
	335	extern void qdisc_class_hash_remove(struct Qdisc_class_hash , struct Qdisc_class_common );
	336	extern void qdisc_class_hash_grow(struct Qdisc , struct Qdisc_class_hash );
	337	extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
	338
e41a33e6 TG	339	extern void dev_init_scheduler(struct net_device *dev);
	340	extern void dev_shutdown(struct net_device *dev);
	341	extern void dev_activate(struct net_device *dev);
	342	extern void dev_deactivate(struct net_device *dev);
44345724	343	extern void dev_deactivate_many(struct list_head *head);
589983cd PM	344	extern struct Qdisc dev_graft_qdisc(struct netdev_queue dev_queue,
589983cd PM	345	struct Qdisc *qdisc);
e41a33e6 TG	346	extern void qdisc_reset(struct Qdisc *qdisc);
e41a33e6 TG	347	extern void qdisc_destroy(struct Qdisc *qdisc);
43effa1e	348	extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
5ce2d488	349	extern struct Qdisc qdisc_alloc(struct netdev_queue dev_queue,
bb949fbd	350	struct Qdisc_ops *ops);
3511c913	351	extern struct Qdisc qdisc_create_dflt(struct netdev_queue dev_queue,
9f9afec4	352	struct Qdisc_ops *ops, u32 parentid);
a2da570d ED	353	extern void __qdisc_calculate_pkt_len(struct sk_buff *skb,
a2da570d ED	354	const struct qdisc_size_table *stab);
a48b5a61	355	extern void tcf_destroy(struct tcf_proto *tp);
ff31ab56	356	extern void tcf_destroy_chain(struct tcf_proto **fl);
1da177e4	357
f0796d5c JF	358	/* Reset all TX qdiscs greater then index of a device. */
f0796d5c JF	359	static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
5aa70995	360	{
4ef6acff JF	361	struct Qdisc *qdisc;
4ef6acff JF	362
f0796d5c	363	for (; i < dev->num_tx_queues; i++) {
4ef6acff JF	364	qdisc = netdev_get_tx_queue(dev, i)->qdisc;
	365	if (qdisc) {
	366	spin_lock_bh(qdisc_lock(qdisc));
	367	qdisc_reset(qdisc);
	368	spin_unlock_bh(qdisc_lock(qdisc));
	369	}
	370	}
5aa70995 DM	371	}
5aa70995 DM	372
5aa70995 DM	373	static inline void qdisc_reset_all_tx(struct net_device *dev)
5aa70995 DM	374	{
f0796d5c	375	qdisc_reset_all_tx_gt(dev, 0);
5aa70995 DM	376	}
5aa70995 DM	377
3e745dd6 DM	378	/* Are all TX queues of the device empty? */
	379	static inline bool qdisc_all_tx_empty(const struct net_device *dev)
	380	{
e8a0464c DM	381	unsigned int i;
	382	for (i = 0; i < dev->num_tx_queues; i++) {
	383	struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
	384	const struct Qdisc *q = txq->qdisc;
3e745dd6	385
e8a0464c DM	386	if (q->q.qlen)
	387	return false;
	388	}
	389	return true;
3e745dd6 DM	390	}
3e745dd6 DM	391
6fa9864b DM	392	/* Are any of the TX qdiscs changing? */
	393	static inline bool qdisc_tx_changing(struct net_device *dev)
	394	{
e8a0464c DM	395	unsigned int i;
	396	for (i = 0; i < dev->num_tx_queues; i++) {
	397	struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
	398	if (txq->qdisc != txq->qdisc_sleeping)
	399	return true;
	400	}
	401	return false;
6fa9864b DM	402	}
6fa9864b DM	403
e8a0464c	404	/* Is the device using the noop qdisc on all queues? */
05297949 DM	405	static inline bool qdisc_tx_is_noop(const struct net_device *dev)
05297949 DM	406	{
e8a0464c DM	407	unsigned int i;
	408	for (i = 0; i < dev->num_tx_queues; i++) {
	409	struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
	410	if (txq->qdisc != &noop_qdisc)
	411	return false;
	412	}
	413	return true;
05297949 DM	414	}
05297949 DM	415
bfe0d029	416	static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
0abf77e5	417	{
175f9c1b	418	return qdisc_skb_cb(skb)->pkt_len;
0abf77e5 JK	419	}
0abf77e5 JK	420
c27f339a	421	/* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
378a2f09 JP	422	enum net_xmit_qdisc_t {
378a2f09 JP	423	__NET_XMIT_STOLEN = 0x00010000,
c27f339a	424	__NET_XMIT_BYPASS = 0x00020000,
378a2f09 JP	425	};
378a2f09 JP	426
c27f339a	427	#ifdef CONFIG_NET_CLS_ACT
378a2f09	428	#define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
378a2f09 JP	429	#else
	430	#define net_xmit_drop_count(e) (1)
	431	#endif
	432
a2da570d ED	433	static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
a2da570d ED	434	const struct Qdisc *sch)
5f86173b	435	{
3a682fbd	436	#ifdef CONFIG_NET_SCHED
a2da570d ED	437	struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
	438
	439	if (stab)
	440	__qdisc_calculate_pkt_len(skb, stab);
3a682fbd	441	#endif
a2da570d ED	442	}
	443
	444	static inline int qdisc_enqueue(struct sk_buff skb, struct Qdisc sch)
	445	{
	446	qdisc_calculate_pkt_len(skb, sch);
5f86173b JK	447	return sch->enqueue(skb, sch);
	448	}
	449
	450	static inline int qdisc_enqueue_root(struct sk_buff skb, struct Qdisc sch)
	451	{
175f9c1b	452	qdisc_skb_cb(skb)->pkt_len = skb->len;
378a2f09	453	return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
5f86173b JK	454	}
5f86173b JK	455
bfe0d029 ED	456
	457	static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
	458	const struct sk_buff *skb)
	459	{
	460	bstats->bytes += qdisc_pkt_len(skb);
	461	bstats->packets += skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1;
	462	}
	463
	464	static inline void qdisc_bstats_update(struct Qdisc *sch,
	465	const struct sk_buff *skb)
bbd8a0d3	466	{
bfe0d029	467	bstats_update(&sch->bstats, skb);
bbd8a0d3 KK	468	}
bbd8a0d3 KK	469
9972b25d TG	470	static inline int __qdisc_enqueue_tail(struct sk_buff skb, struct Qdisc sch,
	471	struct sk_buff_head *list)
	472	{
	473	__skb_queue_tail(list, skb);
0abf77e5	474	sch->qstats.backlog += qdisc_pkt_len(skb);
bfe0d029	475	qdisc_bstats_update(sch, skb);
9972b25d TG	476
	477	return NET_XMIT_SUCCESS;
	478	}
	479
	480	static inline int qdisc_enqueue_tail(struct sk_buff skb, struct Qdisc sch)
	481	{
	482	return __qdisc_enqueue_tail(skb, sch, &sch->q);
	483	}
	484
	485	static inline struct sk_buff __qdisc_dequeue_head(struct Qdisc sch,
	486	struct sk_buff_head *list)
	487	{
	488	struct sk_buff *skb = __skb_dequeue(list);
	489
	490	if (likely(skb != NULL))
0abf77e5	491	sch->qstats.backlog -= qdisc_pkt_len(skb);
9972b25d TG	492
	493	return skb;
	494	}
	495
	496	static inline struct sk_buff qdisc_dequeue_head(struct Qdisc sch)
	497	{
	498	return __qdisc_dequeue_head(sch, &sch->q);
57dbb2d8 HPP	499	}
	500
	501	static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
	502	struct sk_buff_head *list)
	503	{
	504	struct sk_buff *skb = __qdisc_dequeue_head(sch, list);
	505
	506	if (likely(skb != NULL)) {
	507	unsigned int len = qdisc_pkt_len(skb);
	508	kfree_skb(skb);
	509	return len;
	510	}
	511
	512	return 0;
	513	}
	514
	515	static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch)
	516	{
	517	return __qdisc_queue_drop_head(sch, &sch->q);
9972b25d TG	518	}
	519
	520	static inline struct sk_buff __qdisc_dequeue_tail(struct Qdisc sch,
	521	struct sk_buff_head *list)
	522	{
	523	struct sk_buff *skb = __skb_dequeue_tail(list);
	524
	525	if (likely(skb != NULL))
0abf77e5	526	sch->qstats.backlog -= qdisc_pkt_len(skb);
9972b25d TG	527
	528	return skb;
	529	}
	530
	531	static inline struct sk_buff qdisc_dequeue_tail(struct Qdisc sch)
	532	{
	533	return __qdisc_dequeue_tail(sch, &sch->q);
	534	}
	535
48a8f519 PM	536	static inline struct sk_buff qdisc_peek_head(struct Qdisc sch)
	537	{
	538	return skb_peek(&sch->q);
	539	}
	540
77be155c JP	541	/* generic pseudo peek method for non-work-conserving qdisc */
	542	static inline struct sk_buff qdisc_peek_dequeued(struct Qdisc sch)
	543	{
	544	/* we can reuse ->gso_skb because peek isn't called for root qdiscs */
61c9eaf9	545	if (!sch->gso_skb) {
77be155c	546	sch->gso_skb = sch->dequeue(sch);
61c9eaf9 JP	547	if (sch->gso_skb)
	548	/* it's still part of the queue */
	549	sch->q.qlen++;
	550	}
77be155c JP	551
	552	return sch->gso_skb;
	553	}
	554
	555	/* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
	556	static inline struct sk_buff qdisc_dequeue_peeked(struct Qdisc sch)
	557	{
	558	struct sk_buff *skb = sch->gso_skb;
	559
61c9eaf9	560	if (skb) {
77be155c	561	sch->gso_skb = NULL;
61c9eaf9 JP	562	sch->q.qlen--;
61c9eaf9 JP	563	} else {
77be155c	564	skb = sch->dequeue(sch);
61c9eaf9	565	}
77be155c JP	566
	567	return skb;
	568	}
	569
9972b25d TG	570	static inline void __qdisc_reset_queue(struct Qdisc *sch,
	571	struct sk_buff_head *list)
	572	{
	573	/*
	574	* We do not know the backlog in bytes of this list, it
	575	* is up to the caller to correct it
	576	*/
93245dd6	577	__skb_queue_purge(list);
9972b25d TG	578	}
	579
	580	static inline void qdisc_reset_queue(struct Qdisc *sch)
	581	{
	582	__qdisc_reset_queue(sch, &sch->q);
	583	sch->qstats.backlog = 0;
	584	}
	585
	586	static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
	587	struct sk_buff_head *list)
	588	{
	589	struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
	590
	591	if (likely(skb != NULL)) {
0abf77e5	592	unsigned int len = qdisc_pkt_len(skb);
9972b25d TG	593	kfree_skb(skb);
	594	return len;
	595	}
	596
	597	return 0;
	598	}
	599
	600	static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
	601	{
	602	return __qdisc_queue_drop(sch, &sch->q);
	603	}
	604
	605	static inline int qdisc_drop(struct sk_buff skb, struct Qdisc sch)
	606	{
	607	kfree_skb(skb);
	608	sch->qstats.drops++;
	609
	610	return NET_XMIT_DROP;
	611	}
	612
	613	static inline int qdisc_reshape_fail(struct sk_buff skb, struct Qdisc sch)
	614	{
	615	sch->qstats.drops++;
	616
c3bc7cff	617	#ifdef CONFIG_NET_CLS_ACT
9972b25d TG	618	if (sch->reshape_fail == NULL \|\| sch->reshape_fail(skb, sch))
	619	goto drop;
	620
	621	return NET_XMIT_SUCCESS;
	622
	623	drop:
	624	#endif
	625	kfree_skb(skb);
	626	return NET_XMIT_DROP;
	627	}
	628
e9bef55d JDB	629	/* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
	630	long it will take to send a packet given its size.
	631	*/
	632	static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
	633	{
e08b0998 JDB	634	int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
	635	if (slot < 0)
	636	slot = 0;
e9bef55d JDB	637	slot >>= rtab->rate.cell_log;
e9bef55d JDB	638	if (slot > 255)
a02cec21	639	return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
e9bef55d JDB	640	return rtab->data[slot];
	641	}
	642
12da81d1	643	#ifdef CONFIG_NET_CLS_ACT
210d6de7 CG	644	static inline struct sk_buff skb_act_clone(struct sk_buff skb, gfp_t gfp_mask,
210d6de7 CG	645	int action)
12da81d1	646	{
210d6de7 CG	647	struct sk_buff *n;
210d6de7 CG	648
17302107	649	n = skb_clone(skb, gfp_mask);
12da81d1 JHS	650
	651	if (n) {
	652	n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
	653	n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
	654	n->tc_verd = CLR_TC_MUNGED(n->tc_verd);
12da81d1 JHS	655	}
	656	return n;
	657	}
	658	#endif
	659
1da177e4	660	#endif