include/net/sch_generic.h

   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
  12 struct Qdisc_ops;
  13 struct qdisc_walker;
  14 struct tcf_walker;
  15 struct module;
  16
  17 struct qdisc_rate_table {
  18         struct tc_ratespec rate;
  19         u32             data[256];
  20         struct qdisc_rate_table *next;
  21         int             refcnt;
  22 };
  23
  24 enum 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  */
  33 enum qdisc___state_t {
  34         __QDISC___STATE_RUNNING = 1,
  35 };
  36
  37 struct 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
  45 struct 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
  88 static inline bool qdisc_is_running(const struct Qdisc *qdisc)
  89 {
  90         return (qdisc->__state & __QDISC___STATE_RUNNING) ? true : false;
  91 }
  92
  93 static 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
 101 static inline void qdisc_run_end(struct Qdisc *qdisc)
 102 {
 103         qdisc->__state &= ~__QDISC___STATE_RUNNING;
 104 }
 105
 106 static inline bool qdisc_is_throttled(const struct Qdisc *qdisc)
 107 {
 108         return test_bit(__QDISC_STATE_THROTTLED, &qdisc->state) ? true : false;
 109 }
 110
 111 static inline void qdisc_throttled(struct Qdisc *qdisc)
 112 {
 113         set_bit(__QDISC_STATE_THROTTLED, &qdisc->state);
 114 }
 115
 116 static inline void qdisc_unthrottled(struct Qdisc *qdisc)
 117 {
 118         clear_bit(__QDISC_STATE_THROTTLED, &qdisc->state);
 119 }
 120
 121 struct 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
 150 struct 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
 174 struct tcf_result {
 175         unsigned long   class;
 176         u32             classid;
 177 };
 178
 179 struct 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
 205 struct 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
 222 struct qdisc_skb_cb {
 223         unsigned int            pkt_len;
 224         u16                     slave_dev_queue_mapping;
 225         u16                     _pad;
 226         unsigned char           data[20];
 227 };
 228
 229 static 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
 237 static inline int qdisc_qlen(const struct Qdisc *q)
 238 {
 239         return q->q.qlen;
 240 }
 241
 242 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
 243 {
 244         return (struct qdisc_skb_cb *)skb->cb;
 245 }
 246
 247 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
 248 {
 249         return &qdisc->q.lock;
 250 }
 251
 252 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
 253 {
 254         return qdisc->dev_queue->qdisc;
 255 }
 256
 257 static 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  */
 273 static 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
 281 static 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
 289 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
 290 {
 291         return qdisc->dev_queue->dev;
 292 }
 293
 294 static inline void sch_tree_lock(const struct Qdisc *q)
 295 {
 296         spin_lock_bh(qdisc_root_sleeping_lock(q));
 297 }
 298
 299 static 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
 307 extern struct Qdisc noop_qdisc;
 308 extern struct Qdisc_ops noop_qdisc_ops;
 309 extern struct Qdisc_ops pfifo_fast_ops;
 310 extern struct Qdisc_ops mq_qdisc_ops;
 311
 312 struct Qdisc_class_common {
 313         u32                     classid;
 314         struct hlist_node       hnode;
 315 };
 316
 317 struct Qdisc_class_hash {
 318         struct hlist_head       *hash;
 319         unsigned int            hashsize;
 320         unsigned int            hashmask;
 321         unsigned int            hashelems;
 322 };
 323
 324 static 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
 331 static inline struct Qdisc_class_common *
 332 qdisc_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
 346 extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
 347 extern void qdisc_class_hash_insert(struct Qdisc_class_hash *, struct Qdisc_class_common *);
 348 extern void qdisc_class_hash_remove(struct Qdisc_class_hash *, struct Qdisc_class_common *);
 349 extern void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
 350 extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
 351
 352 extern void dev_init_scheduler(struct net_device *dev);
 353 extern void dev_shutdown(struct net_device *dev);
 354 extern void dev_activate(struct net_device *dev);
 355 extern void dev_deactivate(struct net_device *dev);
 356 extern void dev_deactivate_many(struct list_head *head);
 357 extern struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
 358                                      struct Qdisc *qdisc);
 359 extern void qdisc_reset(struct Qdisc *qdisc);
 360 extern void qdisc_destroy(struct Qdisc *qdisc);
 361 extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
 362 extern struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
 363                                  struct Qdisc_ops *ops);
 364 extern struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
 365                                        struct Qdisc_ops *ops, u32 parentid);
 366 extern void __qdisc_calculate_pkt_len(struct sk_buff *skb,
 367                                       const struct qdisc_size_table *stab);
 368 extern void tcf_destroy(struct tcf_proto *tp);
 369 extern void tcf_destroy_chain(struct tcf_proto **fl);
 370
 371 /* Reset all TX qdiscs greater then index of a device.  */
 372 static 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
 386 static 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?  */
 392 static 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?  */
 406 static 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?  */
 418 static 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
 429 static 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) */
 435 enum 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
 446 static 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
 457 static 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
 463 static 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
 470 static 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
 477 static inline void qdisc_bstats_update(struct Qdisc *sch,
 478                                        const struct sk_buff *skb)
 479 {
 480         bstats_update(&sch->bstats, skb);
 481 }
 482
 483 static 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
 492 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
 493 {
 494         return __qdisc_enqueue_tail(skb, sch, &sch->q);
 495 }
 496
 497 static 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
 510 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
 511 {
 512         return __qdisc_dequeue_head(sch, &sch->q);
 513 }
 514
 515 static 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
 530 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch)
 531 {
 532         return __qdisc_queue_drop_head(sch, &sch->q);
 533 }
 534
 535 static 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
 546 static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
 547 {
 548         return __qdisc_dequeue_tail(sch, &sch->q);
 549 }
 550
 551 static 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 */
 557 static 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() */
 571 static 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
 585 static 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
 595 static inline void qdisc_reset_queue(struct Qdisc *sch)
 596 {
 597         __qdisc_reset_queue(sch, &sch->q);
 598         sch->qstats.backlog = 0;
 599 }
 600
 601 static 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
 615 static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
 616 {
 617         return __qdisc_queue_drop(sch, &sch->q);
 618 }
 619
 620 static 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
 628 static 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
 638 drop:
 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  */
 647 static 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
 659 static 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