#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_RUNNING,
        __QDISC_STATE_SCHED,
        __QDISC_STATE_DEACTIVATED,
};

struct qdisc_size_table {
        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_THROTTLED         2
#define TCQ_F_INGRESS           4
#define TCQ_F_CAN_BYPASS        8
#define TCQ_F_MQROOT            16
#define TCQ_F_WARN_NONWC        (1 << 16)
        int                     padded;
        struct Qdisc_ops        *ops;
        struct qdisc_size_table *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;
        struct gnet_stats_queue qstats;
};

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(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 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 net_device *dev,
                                       struct netdev_queue *dev_queue,
                                       struct Qdisc_ops *ops, u32 parentid);
extern void qdisc_calculate_pkt_len(struct sk_buff *skb,
                                   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 of a device.  */
static inline void qdisc_reset_all_tx(struct net_device *dev)
{
        unsigned int i;
        for (i = 0; i < dev->num_tx_queues; i++)
                qdisc_reset(netdev_get_tx_queue(dev, i)->qdisc);
}

/* 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(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 int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
{
#ifdef CONFIG_NET_SCHED
        if (sch->stab)
                qdisc_calculate_pkt_len(skb, sch->stab);
#endif
        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 __qdisc_update_bstats(struct Qdisc *sch, unsigned int len)
{
        sch->bstats.bytes += len;
        sch->bstats.packets++;
}

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_update_bstats(sch, qdisc_pkt_len(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 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)
{
        struct sk_buff *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