linux/include/net/sch_generic.h
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   1#ifndef __NET_SCHED_GENERIC_H
   2#define __NET_SCHED_GENERIC_H
   3
   4#include <linux/netdevice.h>
   5#include <linux/types.h>
   6#include <linux/rcupdate.h>
   7#include <linux/pkt_sched.h>
   8#include <linux/pkt_cls.h>
   9#include <net/gen_stats.h>
  10#include <net/rtnetlink.h>
  11
  12struct Qdisc_ops;
  13struct qdisc_walker;
  14struct tcf_walker;
  15struct module;
  16
  17struct qdisc_rate_table {
  18        struct tc_ratespec rate;
  19        u32             data[256];
  20        struct qdisc_rate_table *next;
  21        int             refcnt;
  22};
  23
  24enum qdisc_state_t {
  25        __QDISC_STATE_SCHED,
  26        __QDISC_STATE_DEACTIVATED,
  27        __QDISC_STATE_THROTTLED,
  28};
  29
  30/*
  31 * following bits are only changed while qdisc lock is held
  32 */
  33enum qdisc___state_t {
  34        __QDISC___STATE_RUNNING = 1,
  35};
  36
  37struct qdisc_size_table {
  38        struct rcu_head         rcu;
  39        struct list_head        list;
  40        struct tc_sizespec      szopts;
  41        int                     refcnt;
  42        u16                     data[];
  43};
  44
  45struct Qdisc {
  46        int                     (*enqueue)(struct sk_buff *skb, struct Qdisc *dev);
  47        struct sk_buff *        (*dequeue)(struct Qdisc *dev);
  48        unsigned int            flags;
  49#define TCQ_F_BUILTIN           1
  50#define TCQ_F_INGRESS           2
  51#define TCQ_F_CAN_BYPASS        4
  52#define TCQ_F_MQROOT            8
  53#define TCQ_F_WARN_NONWC        (1 << 16)
  54        int                     padded;
  55        const struct Qdisc_ops  *ops;
  56        struct qdisc_size_table __rcu *stab;
  57        struct list_head        list;
  58        u32                     handle;
  59        u32                     parent;
  60        atomic_t                refcnt;
  61        struct gnet_stats_rate_est      rate_est;
  62        int                     (*reshape_fail)(struct sk_buff *skb,
  63                                        struct Qdisc *q);
  64
  65        void                    *u32_node;
  66
  67        /* This field is deprecated, but it is still used by CBQ
  68         * and it will live until better solution will be invented.
  69         */
  70        struct Qdisc            *__parent;
  71        struct netdev_queue     *dev_queue;
  72        struct Qdisc            *next_sched;
  73
  74        struct sk_buff          *gso_skb;
  75        /*
  76         * For performance sake on SMP, we put highly modified fields at the end
  77         */
  78        unsigned long           state;
  79        struct sk_buff_head     q;
  80        struct gnet_stats_basic_packed bstats;
  81        unsigned int            __state;
  82        struct gnet_stats_queue qstats;
  83        struct rcu_head         rcu_head;
  84        spinlock_t              busylock;
  85        u32                     limit;
  86};
  87
  88static inline bool qdisc_is_running(const struct Qdisc *qdisc)
  89{
  90        return (qdisc->__state & __QDISC___STATE_RUNNING) ? true : false;
  91}
  92
  93static inline bool qdisc_run_begin(struct Qdisc *qdisc)
  94{
  95        if (qdisc_is_running(qdisc))
  96                return false;
  97        qdisc->__state |= __QDISC___STATE_RUNNING;
  98        return true;
  99}
 100
 101static inline void qdisc_run_end(struct Qdisc *qdisc)
 102{
 103        qdisc->__state &= ~__QDISC___STATE_RUNNING;
 104}
 105
 106static inline bool qdisc_is_throttled(const struct Qdisc *qdisc)
 107{
 108        return test_bit(__QDISC_STATE_THROTTLED, &qdisc->state) ? true : false;
 109}
 110
 111static inline void qdisc_throttled(struct Qdisc *qdisc)
 112{
 113        set_bit(__QDISC_STATE_THROTTLED, &qdisc->state);
 114}
 115
 116static inline void qdisc_unthrottled(struct Qdisc *qdisc)
 117{
 118        clear_bit(__QDISC_STATE_THROTTLED, &qdisc->state);
 119}
 120
 121struct Qdisc_class_ops {
 122        /* Child qdisc manipulation */
 123        struct netdev_queue *   (*select_queue)(struct Qdisc *, struct tcmsg *);
 124        int                     (*graft)(struct Qdisc *, unsigned long cl,
 125                                        struct Qdisc *, struct Qdisc **);
 126        struct Qdisc *          (*leaf)(struct Qdisc *, unsigned long cl);
 127        void                    (*qlen_notify)(struct Qdisc *, unsigned long);
 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,
 133                                        struct nlattr **, unsigned long *);
 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
 150struct Qdisc_ops {
 151        struct Qdisc_ops        *next;
 152        const struct Qdisc_class_ops    *cl_ops;
 153        char                    id[IFNAMSIZ];
 154        int                     priv_size;
 155
 156        int                     (*enqueue)(struct sk_buff *, struct Qdisc *);
 157        struct sk_buff *        (*dequeue)(struct Qdisc *);
 158        struct sk_buff *        (*peek)(struct Qdisc *);
 159        unsigned int            (*drop)(struct Qdisc *);
 160
 161        int                     (*init)(struct Qdisc *, struct nlattr *arg);
 162        void                    (*reset)(struct Qdisc *);
 163        void                    (*destroy)(struct Qdisc *);
 164        int                     (*change)(struct Qdisc *, struct nlattr *arg);
 165        void                    (*attach)(struct Qdisc *);
 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
 174struct tcf_result {
 175        unsigned long   class;
 176        u32             classid;
 177};
 178
 179struct tcf_proto_ops {
 180        struct tcf_proto_ops    *next;
 181        char                    kind[IFNAMSIZ];
 182
 183        int                     (*classify)(struct sk_buff *,
 184                                            const struct tcf_proto *,
 185                                            struct tcf_result *);
 186        int                     (*init)(struct tcf_proto*);
 187        void                    (*destroy)(struct tcf_proto*);
 188
 189        unsigned long           (*get)(struct tcf_proto*, u32 handle);
 190        void                    (*put)(struct tcf_proto*, unsigned long);
 191        int                     (*change)(struct sk_buff *,
 192                                        struct tcf_proto*, unsigned long,
 193                                        u32 handle, struct nlattr **,
 194                                        unsigned long *);
 195        int                     (*delete)(struct tcf_proto*, unsigned long);
 196        void                    (*walk)(struct tcf_proto*, struct tcf_walker *arg);
 197
 198        /* rtnetlink specific */
 199        int                     (*dump)(struct tcf_proto*, unsigned long,
 200                                        struct sk_buff *skb, struct tcmsg*);
 201
 202        struct module           *owner;
 203};
 204
 205struct tcf_proto {
 206        /* Fast access part */
 207        struct tcf_proto        *next;
 208        void                    *root;
 209        int                     (*classify)(struct sk_buff *,
 210                                            const struct tcf_proto *,
 211                                            struct tcf_result *);
 212        __be16                  protocol;
 213
 214        /* All the rest */
 215        u32                     prio;
 216        u32                     classid;
 217        struct Qdisc            *q;
 218        void                    *data;
 219        const struct tcf_proto_ops      *ops;
 220};
 221
 222struct qdisc_skb_cb {
 223        unsigned int            pkt_len;
 224        u16                     slave_dev_queue_mapping;
 225        u16                     _pad;
 226        unsigned char           data[20];
 227};
 228
 229static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
 230{
 231        struct qdisc_skb_cb *qcb;
 232
 233        BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
 234        BUILD_BUG_ON(sizeof(qcb->data) < sz);
 235}
 236
 237static inline int qdisc_qlen(const struct Qdisc *q)
 238{
 239        return q->q.qlen;
 240}
 241
 242static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
 243{
 244        return (struct qdisc_skb_cb *)skb->cb;
 245}
 246
 247static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
 248{
 249        return &qdisc->q.lock;
 250}
 251
 252static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
 253{
 254        return qdisc->dev_queue->qdisc;
 255}
 256
 257static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
 258{
 259        return qdisc->dev_queue->qdisc_sleeping;
 260}
 261
 262/* The qdisc root lock is a mechanism by which to top level
 263 * of a qdisc tree can be locked from any qdisc node in the
 264 * forest.  This allows changing the configuration of some
 265 * aspect of the qdisc tree while blocking out asynchronous
 266 * qdisc access in the packet processing paths.
 267 *
 268 * It is only legal to do this when the root will not change
 269 * on us.  Otherwise we'll potentially lock the wrong qdisc
 270 * root.  This is enforced by holding the RTNL semaphore, which
 271 * all users of this lock accessor must do.
 272 */
 273static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
 274{
 275        struct Qdisc *root = qdisc_root(qdisc);
 276
 277        ASSERT_RTNL();
 278        return qdisc_lock(root);
 279}
 280
 281static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
 282{
 283        struct Qdisc *root = qdisc_root_sleeping(qdisc);
 284
 285        ASSERT_RTNL();
 286        return qdisc_lock(root);
 287}
 288
 289static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
 290{
 291        return qdisc->dev_queue->dev;
 292}
 293
 294static inline void sch_tree_lock(const struct Qdisc *q)
 295{
 296        spin_lock_bh(qdisc_root_sleeping_lock(q));
 297}
 298
 299static inline void sch_tree_unlock(const struct Qdisc *q)
 300{
 301        spin_unlock_bh(qdisc_root_sleeping_lock(q));
 302}
 303
 304#define tcf_tree_lock(tp)       sch_tree_lock((tp)->q)
 305#define tcf_tree_unlock(tp)     sch_tree_unlock((tp)->q)
 306
 307extern struct Qdisc noop_qdisc;
 308extern struct Qdisc_ops noop_qdisc_ops;
 309extern struct Qdisc_ops pfifo_fast_ops;
 310extern struct Qdisc_ops mq_qdisc_ops;
 311
 312struct Qdisc_class_common {
 313        u32                     classid;
 314        struct hlist_node       hnode;
 315};
 316
 317struct Qdisc_class_hash {
 318        struct hlist_head       *hash;
 319        unsigned int            hashsize;
 320        unsigned int            hashmask;
 321        unsigned int            hashelems;
 322};
 323
 324static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
 325{
 326        id ^= id >> 8;
 327        id ^= id >> 4;
 328        return id & mask;
 329}
 330
 331static inline struct Qdisc_class_common *
 332qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
 333{
 334        struct Qdisc_class_common *cl;
 335        struct hlist_node *n;
 336        unsigned int h;
 337
 338        h = qdisc_class_hash(id, hash->hashmask);
 339        hlist_for_each_entry(cl, n, &hash->hash[h], hnode) {
 340                if (cl->classid == id)
 341                        return cl;
 342        }
 343        return NULL;
 344}
 345
 346extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
 347extern void qdisc_class_hash_insert(struct Qdisc_class_hash *, struct Qdisc_class_common *);
 348extern void qdisc_class_hash_remove(struct Qdisc_class_hash *, struct Qdisc_class_common *);
 349extern void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
 350extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
 351
 352extern void dev_init_scheduler(struct net_device *dev);
 353extern void dev_shutdown(struct net_device *dev);
 354extern void dev_activate(struct net_device *dev);
 355extern void dev_deactivate(struct net_device *dev);
 356extern void dev_deactivate_many(struct list_head *head);
 357extern struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
 358                                     struct Qdisc *qdisc);
 359extern void qdisc_reset(struct Qdisc *qdisc);
 360extern void qdisc_destroy(struct Qdisc *qdisc);
 361extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
 362extern struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
 363                                 struct Qdisc_ops *ops);
 364extern struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
 365                                       struct Qdisc_ops *ops, u32 parentid);
 366extern void __qdisc_calculate_pkt_len(struct sk_buff *skb,
 367                                      const struct qdisc_size_table *stab);
 368extern void tcf_destroy(struct tcf_proto *tp);
 369extern void tcf_destroy_chain(struct tcf_proto **fl);
 370
 371/* Reset all TX qdiscs greater then index of a device.  */
 372static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
 373{
 374        struct Qdisc *qdisc;
 375
 376        for (; i < dev->num_tx_queues; i++) {
 377                qdisc = netdev_get_tx_queue(dev, i)->qdisc;
 378                if (qdisc) {
 379                        spin_lock_bh(qdisc_lock(qdisc));
 380                        qdisc_reset(qdisc);
 381                        spin_unlock_bh(qdisc_lock(qdisc));
 382                }
 383        }
 384}
 385
 386static inline void qdisc_reset_all_tx(struct net_device *dev)
 387{
 388        qdisc_reset_all_tx_gt(dev, 0);
 389}
 390
 391/* Are all TX queues of the device empty?  */
 392static inline bool qdisc_all_tx_empty(const struct net_device *dev)
 393{
 394        unsigned int i;
 395        for (i = 0; i < dev->num_tx_queues; i++) {
 396                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
 397                const struct Qdisc *q = txq->qdisc;
 398
 399                if (q->q.qlen)
 400                        return false;
 401        }
 402        return true;
 403}
 404
 405/* Are any of the TX qdiscs changing?  */
 406static inline bool qdisc_tx_changing(const struct net_device *dev)
 407{
 408        unsigned int i;
 409        for (i = 0; i < dev->num_tx_queues; i++) {
 410                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
 411                if (txq->qdisc != txq->qdisc_sleeping)
 412                        return true;
 413        }
 414        return false;
 415}
 416
 417/* Is the device using the noop qdisc on all queues?  */
 418static inline bool qdisc_tx_is_noop(const struct net_device *dev)
 419{
 420        unsigned int i;
 421        for (i = 0; i < dev->num_tx_queues; i++) {
 422                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
 423                if (txq->qdisc != &noop_qdisc)
 424                        return false;
 425        }
 426        return true;
 427}
 428
 429static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
 430{
 431        return qdisc_skb_cb(skb)->pkt_len;
 432}
 433
 434/* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
 435enum net_xmit_qdisc_t {
 436        __NET_XMIT_STOLEN = 0x00010000,
 437        __NET_XMIT_BYPASS = 0x00020000,
 438};
 439
 440#ifdef CONFIG_NET_CLS_ACT
 441#define net_xmit_drop_count(e)  ((e) & __NET_XMIT_STOLEN ? 0 : 1)
 442#else
 443#define net_xmit_drop_count(e)  (1)
 444#endif
 445
 446static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
 447                                           const struct Qdisc *sch)
 448{
 449#ifdef CONFIG_NET_SCHED
 450        struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
 451
 452        if (stab)
 453                __qdisc_calculate_pkt_len(skb, stab);
 454#endif
 455}
 456
 457static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
 458{
 459        qdisc_calculate_pkt_len(skb, sch);
 460        return sch->enqueue(skb, sch);
 461}
 462
 463static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch)
 464{
 465        qdisc_skb_cb(skb)->pkt_len = skb->len;
 466        return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
 467}
 468
 469
 470static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
 471                                 const struct sk_buff *skb)
 472{
 473        bstats->bytes += qdisc_pkt_len(skb);
 474        bstats->packets += skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1;
 475}
 476
 477static inline void qdisc_bstats_update(struct Qdisc *sch,
 478                                       const struct sk_buff *skb)
 479{
 480        bstats_update(&sch->bstats, skb);
 481}
 482
 483static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
 484                                       struct sk_buff_head *list)
 485{
 486        __skb_queue_tail(list, skb);
 487        sch->qstats.backlog += qdisc_pkt_len(skb);
 488
 489        return NET_XMIT_SUCCESS;
 490}
 491
 492static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
 493{
 494        return __qdisc_enqueue_tail(skb, sch, &sch->q);
 495}
 496
 497static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
 498                                                   struct sk_buff_head *list)
 499{
 500        struct sk_buff *skb = __skb_dequeue(list);
 501
 502        if (likely(skb != NULL)) {
 503                sch->qstats.backlog -= qdisc_pkt_len(skb);
 504                qdisc_bstats_update(sch, skb);
 505        }
 506
 507        return skb;
 508}
 509
 510static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
 511{
 512        return __qdisc_dequeue_head(sch, &sch->q);
 513}
 514
 515static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
 516                                              struct sk_buff_head *list)
 517{
 518        struct sk_buff *skb = __skb_dequeue(list);
 519
 520        if (likely(skb != NULL)) {
 521                unsigned int len = qdisc_pkt_len(skb);
 522                sch->qstats.backlog -= len;
 523                kfree_skb(skb);
 524                return len;
 525        }
 526
 527        return 0;
 528}
 529
 530static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch)
 531{
 532        return __qdisc_queue_drop_head(sch, &sch->q);
 533}
 534
 535static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
 536                                                   struct sk_buff_head *list)
 537{
 538        struct sk_buff *skb = __skb_dequeue_tail(list);
 539
 540        if (likely(skb != NULL))
 541                sch->qstats.backlog -= qdisc_pkt_len(skb);
 542
 543        return skb;
 544}
 545
 546static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
 547{
 548        return __qdisc_dequeue_tail(sch, &sch->q);
 549}
 550
 551static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
 552{
 553        return skb_peek(&sch->q);
 554}
 555
 556/* generic pseudo peek method for non-work-conserving qdisc */
 557static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
 558{
 559        /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
 560        if (!sch->gso_skb) {
 561                sch->gso_skb = sch->dequeue(sch);
 562                if (sch->gso_skb)
 563                        /* it's still part of the queue */
 564                        sch->q.qlen++;
 565        }
 566
 567        return sch->gso_skb;
 568}
 569
 570/* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
 571static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
 572{
 573        struct sk_buff *skb = sch->gso_skb;
 574
 575        if (skb) {
 576                sch->gso_skb = NULL;
 577                sch->q.qlen--;
 578        } else {
 579                skb = sch->dequeue(sch);
 580        }
 581
 582        return skb;
 583}
 584
 585static inline void __qdisc_reset_queue(struct Qdisc *sch,
 586                                       struct sk_buff_head *list)
 587{
 588        /*
 589         * We do not know the backlog in bytes of this list, it
 590         * is up to the caller to correct it
 591         */
 592        __skb_queue_purge(list);
 593}
 594
 595static inline void qdisc_reset_queue(struct Qdisc *sch)
 596{
 597        __qdisc_reset_queue(sch, &sch->q);
 598        sch->qstats.backlog = 0;
 599}
 600
 601static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
 602                                              struct sk_buff_head *list)
 603{
 604        struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
 605
 606        if (likely(skb != NULL)) {
 607                unsigned int len = qdisc_pkt_len(skb);
 608                kfree_skb(skb);
 609                return len;
 610        }
 611
 612        return 0;
 613}
 614
 615static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
 616{
 617        return __qdisc_queue_drop(sch, &sch->q);
 618}
 619
 620static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
 621{
 622        kfree_skb(skb);
 623        sch->qstats.drops++;
 624
 625        return NET_XMIT_DROP;
 626}
 627
 628static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
 629{
 630        sch->qstats.drops++;
 631
 632#ifdef CONFIG_NET_CLS_ACT
 633        if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
 634                goto drop;
 635
 636        return NET_XMIT_SUCCESS;
 637
 638drop:
 639#endif
 640        kfree_skb(skb);
 641        return NET_XMIT_DROP;
 642}
 643
 644/* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
 645   long it will take to send a packet given its size.
 646 */
 647static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
 648{
 649        int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
 650        if (slot < 0)
 651                slot = 0;
 652        slot >>= rtab->rate.cell_log;
 653        if (slot > 255)
 654                return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
 655        return rtab->data[slot];
 656}
 657
 658#ifdef CONFIG_NET_CLS_ACT
 659static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask,
 660                                            int action)
 661{
 662        struct sk_buff *n;
 663
 664        n = skb_clone(skb, gfp_mask);
 665
 666        if (n) {
 667                n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
 668                n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
 669                n->tc_verd = CLR_TC_MUNGED(n->tc_verd);
 670        }
 671        return n;
 672}
 673#endif
 674
 675#endif
 676
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