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 tcf_proto*, unsigned long,
 192                                        u32 handle, struct nlattr **,
 193                                        unsigned long *);
 194        int                     (*delete)(struct tcf_proto*, unsigned long);
 195        void                    (*walk)(struct tcf_proto*, struct tcf_walker *arg);
 196
 197        /* rtnetlink specific */
 198        int                     (*dump)(struct tcf_proto*, unsigned long,
 199                                        struct sk_buff *skb, struct tcmsg*);
 200
 201        struct module           *owner;
 202};
 203
 204struct tcf_proto {
 205        /* Fast access part */
 206        struct tcf_proto        *next;
 207        void                    *root;
 208        int                     (*classify)(struct sk_buff *,
 209                                            const struct tcf_proto *,
 210                                            struct tcf_result *);
 211        __be16                  protocol;
 212
 213        /* All the rest */
 214        u32                     prio;
 215        u32                     classid;
 216        struct Qdisc            *q;
 217        void                    *data;
 218        const struct tcf_proto_ops      *ops;
 219};
 220
 221struct qdisc_skb_cb {
 222        unsigned int            pkt_len;
 223        u16                     slave_dev_queue_mapping;
 224        u16                     _pad;
 225        unsigned char           data[20];
 226};
 227
 228static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
 229{
 230        struct qdisc_skb_cb *qcb;
 231
 232        BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
 233        BUILD_BUG_ON(sizeof(qcb->data) < sz);
 234}
 235
 236static inline int qdisc_qlen(const struct Qdisc *q)
 237{
 238        return q->q.qlen;
 239}
 240
 241static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
 242{
 243        return (struct qdisc_skb_cb *)skb->cb;
 244}
 245
 246static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
 247{
 248        return &qdisc->q.lock;
 249}
 250
 251static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
 252{
 253        return qdisc->dev_queue->qdisc;
 254}
 255
 256static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
 257{
 258        return qdisc->dev_queue->qdisc_sleeping;
 259}
 260
 261/* The qdisc root lock is a mechanism by which to top level
 262 * of a qdisc tree can be locked from any qdisc node in the
 263 * forest.  This allows changing the configuration of some
 264 * aspect of the qdisc tree while blocking out asynchronous
 265 * qdisc access in the packet processing paths.
 266 *
 267 * It is only legal to do this when the root will not change
 268 * on us.  Otherwise we'll potentially lock the wrong qdisc
 269 * root.  This is enforced by holding the RTNL semaphore, which
 270 * all users of this lock accessor must do.
 271 */
 272static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
 273{
 274        struct Qdisc *root = qdisc_root(qdisc);
 275
 276        ASSERT_RTNL();
 277        return qdisc_lock(root);
 278}
 279
 280static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
 281{
 282        struct Qdisc *root = qdisc_root_sleeping(qdisc);
 283
 284        ASSERT_RTNL();
 285        return qdisc_lock(root);
 286}
 287
 288static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
 289{
 290        return qdisc->dev_queue->dev;
 291}
 292
 293static inline void sch_tree_lock(const struct Qdisc *q)
 294{
 295        spin_lock_bh(qdisc_root_sleeping_lock(q));
 296}
 297
 298static inline void sch_tree_unlock(const struct Qdisc *q)
 299{
 300        spin_unlock_bh(qdisc_root_sleeping_lock(q));
 301}
 302
 303#define tcf_tree_lock(tp)       sch_tree_lock((tp)->q)
 304#define tcf_tree_unlock(tp)     sch_tree_unlock((tp)->q)
 305
 306extern struct Qdisc noop_qdisc;
 307extern struct Qdisc_ops noop_qdisc_ops;
 308extern struct Qdisc_ops pfifo_fast_ops;
 309extern struct Qdisc_ops mq_qdisc_ops;
 310
 311struct Qdisc_class_common {
 312        u32                     classid;
 313        struct hlist_node       hnode;
 314};
 315
 316struct Qdisc_class_hash {
 317        struct hlist_head       *hash;
 318        unsigned int            hashsize;
 319        unsigned int            hashmask;
 320        unsigned int            hashelems;
 321};
 322
 323static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
 324{
 325        id ^= id >> 8;
 326        id ^= id >> 4;
 327        return id & mask;
 328}
 329
 330static inline struct Qdisc_class_common *
 331qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
 332{
 333        struct Qdisc_class_common *cl;
 334        struct hlist_node *n;
 335        unsigned int h;
 336
 337        h = qdisc_class_hash(id, hash->hashmask);
 338        hlist_for_each_entry(cl, n, &hash->hash[h], hnode) {
 339                if (cl->classid == id)
 340                        return cl;
 341        }
 342        return NULL;
 343}
 344
 345extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
 346extern void qdisc_class_hash_insert(struct Qdisc_class_hash *, struct Qdisc_class_common *);
 347extern void qdisc_class_hash_remove(struct Qdisc_class_hash *, struct Qdisc_class_common *);
 348extern void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
 349extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
 350
 351extern void dev_init_scheduler(struct net_device *dev);
 352extern void dev_shutdown(struct net_device *dev);
 353extern void dev_activate(struct net_device *dev);
 354extern void dev_deactivate(struct net_device *dev);
 355extern void dev_deactivate_many(struct list_head *head);
 356extern struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
 357                                     struct Qdisc *qdisc);
 358extern void qdisc_reset(struct Qdisc *qdisc);
 359extern void qdisc_destroy(struct Qdisc *qdisc);
 360extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
 361extern struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
 362                                 struct Qdisc_ops *ops);
 363extern struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
 364                                       struct Qdisc_ops *ops, u32 parentid);
 365extern void __qdisc_calculate_pkt_len(struct sk_buff *skb,
 366                                      const struct qdisc_size_table *stab);
 367extern void tcf_destroy(struct tcf_proto *tp);
 368extern void tcf_destroy_chain(struct tcf_proto **fl);
 369
 370/* Reset all TX qdiscs greater then index of a device.  */
 371static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
 372{
 373        struct Qdisc *qdisc;
 374
 375        for (; i < dev->num_tx_queues; i++) {
 376                qdisc = netdev_get_tx_queue(dev, i)->qdisc;
 377                if (qdisc) {
 378                        spin_lock_bh(qdisc_lock(qdisc));
 379                        qdisc_reset(qdisc);
 380                        spin_unlock_bh(qdisc_lock(qdisc));
 381                }
 382        }
 383}
 384
 385static inline void qdisc_reset_all_tx(struct net_device *dev)
 386{
 387        qdisc_reset_all_tx_gt(dev, 0);
 388}
 389
 390/* Are all TX queues of the device empty?  */
 391static inline bool qdisc_all_tx_empty(const struct net_device *dev)
 392{
 393        unsigned int i;
 394        for (i = 0; i < dev->num_tx_queues; i++) {
 395                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
 396                const struct Qdisc *q = txq->qdisc;
 397
 398                if (q->q.qlen)
 399                        return false;
 400        }
 401        return true;
 402}
 403
 404/* Are any of the TX qdiscs changing?  */
 405static inline bool qdisc_tx_changing(const struct net_device *dev)
 406{
 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 != txq->qdisc_sleeping)
 411                        return true;
 412        }
 413        return false;
 414}
 415
 416/* Is the device using the noop qdisc on all queues?  */
 417static inline bool qdisc_tx_is_noop(const struct net_device *dev)
 418{
 419        unsigned int i;
 420        for (i = 0; i < dev->num_tx_queues; i++) {
 421                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
 422                if (txq->qdisc != &noop_qdisc)
 423                        return false;
 424        }
 425        return true;
 426}
 427
 428static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
 429{
 430        return qdisc_skb_cb(skb)->pkt_len;
 431}
 432
 433/* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
 434enum net_xmit_qdisc_t {
 435        __NET_XMIT_STOLEN = 0x00010000,
 436        __NET_XMIT_BYPASS = 0x00020000,
 437};
 438
 439#ifdef CONFIG_NET_CLS_ACT
 440#define net_xmit_drop_count(e)  ((e) & __NET_XMIT_STOLEN ? 0 : 1)
 441#else
 442#define net_xmit_drop_count(e)  (1)
 443#endif
 444
 445static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
 446                                           const struct Qdisc *sch)
 447{
 448#ifdef CONFIG_NET_SCHED
 449        struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
 450
 451        if (stab)
 452                __qdisc_calculate_pkt_len(skb, stab);
 453#endif
 454}
 455
 456static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
 457{
 458        qdisc_calculate_pkt_len(skb, sch);
 459        return sch->enqueue(skb, sch);
 460}
 461
 462static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch)
 463{
 464        qdisc_skb_cb(skb)->pkt_len = skb->len;
 465        return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
 466}
 467
 468
 469static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
 470                                 const struct sk_buff *skb)
 471{
 472        bstats->bytes += qdisc_pkt_len(skb);
 473        bstats->packets += skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1;
 474}
 475
 476static inline void qdisc_bstats_update(struct Qdisc *sch,
 477                                       const struct sk_buff *skb)
 478{
 479        bstats_update(&sch->bstats, skb);
 480}
 481
 482static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
 483                                       struct sk_buff_head *list)
 484{
 485        __skb_queue_tail(list, skb);
 486        sch->qstats.backlog += qdisc_pkt_len(skb);
 487
 488        return NET_XMIT_SUCCESS;
 489}
 490
 491static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
 492{
 493        return __qdisc_enqueue_tail(skb, sch, &sch->q);
 494}
 495
 496static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
 497                                                   struct sk_buff_head *list)
 498{
 499        struct sk_buff *skb = __skb_dequeue(list);
 500
 501        if (likely(skb != NULL)) {
 502                sch->qstats.backlog -= qdisc_pkt_len(skb);
 503                qdisc_bstats_update(sch, skb);
 504        }
 505
 506        return skb;
 507}
 508
 509static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
 510{
 511        return __qdisc_dequeue_head(sch, &sch->q);
 512}
 513
 514static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
 515                                              struct sk_buff_head *list)
 516{
 517        struct sk_buff *skb = __skb_dequeue(list);
 518
 519        if (likely(skb != NULL)) {
 520                unsigned int len = qdisc_pkt_len(skb);
 521                sch->qstats.backlog -= len;
 522                kfree_skb(skb);
 523                return len;
 524        }
 525
 526        return 0;
 527}
 528
 529static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch)
 530{
 531        return __qdisc_queue_drop_head(sch, &sch->q);
 532}
 533
 534static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
 535                                                   struct sk_buff_head *list)
 536{
 537        struct sk_buff *skb = __skb_dequeue_tail(list);
 538
 539        if (likely(skb != NULL))
 540                sch->qstats.backlog -= qdisc_pkt_len(skb);
 541
 542        return skb;
 543}
 544
 545static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
 546{
 547        return __qdisc_dequeue_tail(sch, &sch->q);
 548}
 549
 550static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
 551{
 552        return skb_peek(&sch->q);
 553}
 554
 555/* generic pseudo peek method for non-work-conserving qdisc */
 556static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
 557{
 558        /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
 559        if (!sch->gso_skb) {
 560                sch->gso_skb = sch->dequeue(sch);
 561                if (sch->gso_skb)
 562                        /* it's still part of the queue */
 563                        sch->q.qlen++;
 564        }
 565
 566        return sch->gso_skb;
 567}
 568
 569/* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
 570static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
 571{
 572        struct sk_buff *skb = sch->gso_skb;
 573
 574        if (skb) {
 575                sch->gso_skb = NULL;
 576                sch->q.qlen--;
 577        } else {
 578                skb = sch->dequeue(sch);
 579        }
 580
 581        return skb;
 582}
 583
 584static inline void __qdisc_reset_queue(struct Qdisc *sch,
 585                                       struct sk_buff_head *list)
 586{
 587        /*
 588         * We do not know the backlog in bytes of this list, it
 589         * is up to the caller to correct it
 590         */
 591        __skb_queue_purge(list);
 592}
 593
 594static inline void qdisc_reset_queue(struct Qdisc *sch)
 595{
 596        __qdisc_reset_queue(sch, &sch->q);
 597        sch->qstats.backlog = 0;
 598}
 599
 600static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
 601                                              struct sk_buff_head *list)
 602{
 603        struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
 604
 605        if (likely(skb != NULL)) {
 606                unsigned int len = qdisc_pkt_len(skb);
 607                kfree_skb(skb);
 608                return len;
 609        }
 610
 611        return 0;
 612}
 613
 614static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
 615{
 616        return __qdisc_queue_drop(sch, &sch->q);
 617}
 618
 619static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
 620{
 621        kfree_skb(skb);
 622        sch->qstats.drops++;
 623
 624        return NET_XMIT_DROP;
 625}
 626
 627static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
 628{
 629        sch->qstats.drops++;
 630
 631#ifdef CONFIG_NET_CLS_ACT
 632        if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
 633                goto drop;
 634
 635        return NET_XMIT_SUCCESS;
 636
 637drop:
 638#endif
 639        kfree_skb(skb);
 640        return NET_XMIT_DROP;
 641}
 642
 643/* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
 644   long it will take to send a packet given its size.
 645 */
 646static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
 647{
 648        int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
 649        if (slot < 0)
 650                slot = 0;
 651        slot >>= rtab->rate.cell_log;
 652        if (slot > 255)
 653                return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
 654        return rtab->data[slot];
 655}
 656
 657#ifdef CONFIG_NET_CLS_ACT
 658static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask,
 659                                            int action)
 660{
 661        struct sk_buff *n;
 662
 663        n = skb_clone(skb, gfp_mask);
 664
 665        if (n) {
 666                n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
 667                n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
 668                n->tc_verd = CLR_TC_MUNGED(n->tc_verd);
 669        }
 670        return n;
 671}
 672#endif
 673
 674#endif
 675
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