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_ONETXQUEUE        0x10 /* dequeue_skb() can assume all skbs are for
  54                                       * q->dev_queue : It can test
  55                                       * netif_xmit_frozen_or_stopped() before
  56                                       * dequeueing next packet.
  57                                       * Its true for MQ/MQPRIO slaves, or non
  58                                       * multiqueue device.
  59                                       */
  60 #define TCQ_F_WARN_NONWC        (1 << 16)
  61         int                     padded;
  62         const struct Qdisc_ops  *ops;
  63         struct qdisc_size_table __rcu *stab;
  64         struct list_head        list;
  65         u32                     handle;
  66         u32                     parent;
  67         atomic_t                refcnt;
  68         struct gnet_stats_rate_est      rate_est;
  69         int                     (*reshape_fail)(struct sk_buff *skb,
  70                                         struct Qdisc *q);
  71
  72         void                    *u32_node;
  73
  74         /* This field is deprecated, but it is still used by CBQ
  75          * and it will live until better solution will be invented.
  76          */
  77         struct Qdisc            *__parent;
  78         struct netdev_queue     *dev_queue;
  79         struct Qdisc            *next_sched;
  80
  81         struct sk_buff          *gso_skb;
  82         /*
  83          * For performance sake on SMP, we put highly modified fields at the end
  84          */
  85         unsigned long           state;
  86         struct sk_buff_head     q;
  87         struct gnet_stats_basic_packed bstats;
  88         unsigned int            __state;
  89         struct gnet_stats_queue qstats;
  90         struct rcu_head         rcu_head;
  91         spinlock_t              busylock;
  92         u32                     limit;
  93 };
  94
  95 static inline bool qdisc_is_running(const struct Qdisc *qdisc)
  96 {
  97         return (qdisc->__state & __QDISC___STATE_RUNNING) ? true : false;
  98 }
  99
 100 static inline bool qdisc_run_begin(struct Qdisc *qdisc)
 101 {
 102         if (qdisc_is_running(qdisc))
 103                 return false;
 104         qdisc->__state |= __QDISC___STATE_RUNNING;
 105         return true;
 106 }
 107
 108 static inline void qdisc_run_end(struct Qdisc *qdisc)
 109 {
 110         qdisc->__state &= ~__QDISC___STATE_RUNNING;
 111 }
 112
 113 static inline bool qdisc_is_throttled(const struct Qdisc *qdisc)
 114 {
 115         return test_bit(__QDISC_STATE_THROTTLED, &qdisc->state) ? true : false;
 116 }
 117
 118 static inline void qdisc_throttled(struct Qdisc *qdisc)
 119 {
 120         set_bit(__QDISC_STATE_THROTTLED, &qdisc->state);
 121 }
 122
 123 static inline void qdisc_unthrottled(struct Qdisc *qdisc)
 124 {
 125         clear_bit(__QDISC_STATE_THROTTLED, &qdisc->state);
 126 }
 127
 128 struct Qdisc_class_ops {
 129         /* Child qdisc manipulation */
 130         struct netdev_queue *   (*select_queue)(struct Qdisc *, struct tcmsg *);
 131         int                     (*graft)(struct Qdisc *, unsigned long cl,
 132                                         struct Qdisc *, struct Qdisc **);
 133         struct Qdisc *          (*leaf)(struct Qdisc *, unsigned long cl);
 134         void                    (*qlen_notify)(struct Qdisc *, unsigned long);
 135
 136         /* Class manipulation routines */
 137         unsigned long           (*get)(struct Qdisc *, u32 classid);
 138         void                    (*put)(struct Qdisc *, unsigned long);
 139         int                     (*change)(struct Qdisc *, u32, u32,
 140                                         struct nlattr **, unsigned long *);
 141         int                     (*delete)(struct Qdisc *, unsigned long);
 142         void                    (*walk)(struct Qdisc *, struct qdisc_walker * arg);
 143
 144         /* Filter manipulation */
 145         struct tcf_proto **     (*tcf_chain)(struct Qdisc *, unsigned long);
 146         unsigned long           (*bind_tcf)(struct Qdisc *, unsigned long,
 147                                         u32 classid);
 148         void                    (*unbind_tcf)(struct Qdisc *, unsigned long);
 149
 150         /* rtnetlink specific */
 151         int                     (*dump)(struct Qdisc *, unsigned long,
 152                                         struct sk_buff *skb, struct tcmsg*);
 153         int                     (*dump_stats)(struct Qdisc *, unsigned long,
 154                                         struct gnet_dump *);
 155 };
 156
 157 struct Qdisc_ops {
 158         struct Qdisc_ops        *next;
 159         const struct Qdisc_class_ops    *cl_ops;
 160         char                    id[IFNAMSIZ];
 161         int                     priv_size;
 162
 163         int                     (*enqueue)(struct sk_buff *, struct Qdisc *);
 164         struct sk_buff *        (*dequeue)(struct Qdisc *);
 165         struct sk_buff *        (*peek)(struct Qdisc *);
 166         unsigned int            (*drop)(struct Qdisc *);
 167
 168         int                     (*init)(struct Qdisc *, struct nlattr *arg);
 169         void                    (*reset)(struct Qdisc *);
 170         void                    (*destroy)(struct Qdisc *);
 171         int                     (*change)(struct Qdisc *, struct nlattr *arg);
 172         void                    (*attach)(struct Qdisc *);
 173
 174         int                     (*dump)(struct Qdisc *, struct sk_buff *);
 175         int                     (*dump_stats)(struct Qdisc *, struct gnet_dump *);
 176
 177         struct module           *owner;
 178 };
 179
 180
 181 struct tcf_result {
 182         unsigned long   class;
 183         u32             classid;
 184 };
 185
 186 struct tcf_proto_ops {
 187         struct tcf_proto_ops    *next;
 188         char                    kind[IFNAMSIZ];
 189
 190         int                     (*classify)(struct sk_buff *,
 191                                             const struct tcf_proto *,
 192                                             struct tcf_result *);
 193         int                     (*init)(struct tcf_proto*);
 194         void                    (*destroy)(struct tcf_proto*);
 195
 196         unsigned long           (*get)(struct tcf_proto*, u32 handle);
 197         void                    (*put)(struct tcf_proto*, unsigned long);
 198         int                     (*change)(struct net *net, struct sk_buff *,
 199                                         struct tcf_proto*, unsigned long,
 200                                         u32 handle, struct nlattr **,
 201                                         unsigned long *);
 202         int                     (*delete)(struct tcf_proto*, unsigned long);
 203         void                    (*walk)(struct tcf_proto*, struct tcf_walker *arg);
 204
 205         /* rtnetlink specific */
 206         int                     (*dump)(struct tcf_proto*, unsigned long,
 207                                         struct sk_buff *skb, struct tcmsg*);
 208
 209         struct module           *owner;
 210 };
 211
 212 struct tcf_proto {
 213         /* Fast access part */
 214         struct tcf_proto        *next;
 215         void                    *root;
 216         int                     (*classify)(struct sk_buff *,
 217                                             const struct tcf_proto *,
 218                                             struct tcf_result *);
 219         __be16                  protocol;
 220
 221         /* All the rest */
 222         u32                     prio;
 223         u32                     classid;
 224         struct Qdisc            *q;
 225         void                    *data;
 226         const struct tcf_proto_ops      *ops;
 227 };
 228
 229 struct qdisc_skb_cb {
 230         unsigned int            pkt_len;
 231         u16                     slave_dev_queue_mapping;
 232         u16                     _pad;
 233         unsigned char           data[20];
 234 };
 235
 236 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
 237 {
 238         struct qdisc_skb_cb *qcb;
 239
 240         BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
 241         BUILD_BUG_ON(sizeof(qcb->data) < sz);
 242 }
 243
 244 static inline int qdisc_qlen(const struct Qdisc *q)
 245 {
 246         return q->q.qlen;
 247 }
 248
 249 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
 250 {
 251         return (struct qdisc_skb_cb *)skb->cb;
 252 }
 253
 254 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
 255 {
 256         return &qdisc->q.lock;
 257 }
 258
 259 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
 260 {
 261         return qdisc->dev_queue->qdisc;
 262 }
 263
 264 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
 265 {
 266         return qdisc->dev_queue->qdisc_sleeping;
 267 }
 268
 269 /* The qdisc root lock is a mechanism by which to top level
 270  * of a qdisc tree can be locked from any qdisc node in the
 271  * forest.  This allows changing the configuration of some
 272  * aspect of the qdisc tree while blocking out asynchronous
 273  * qdisc access in the packet processing paths.
 274  *
 275  * It is only legal to do this when the root will not change
 276  * on us.  Otherwise we'll potentially lock the wrong qdisc
 277  * root.  This is enforced by holding the RTNL semaphore, which
 278  * all users of this lock accessor must do.
 279  */
 280 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
 281 {
 282         struct Qdisc *root = qdisc_root(qdisc);
 283
 284         ASSERT_RTNL();
 285         return qdisc_lock(root);
 286 }
 287
 288 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
 289 {
 290         struct Qdisc *root = qdisc_root_sleeping(qdisc);
 291
 292         ASSERT_RTNL();
 293         return qdisc_lock(root);
 294 }
 295
 296 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
 297 {
 298         return qdisc->dev_queue->dev;
 299 }
 300
 301 static inline void sch_tree_lock(const struct Qdisc *q)
 302 {
 303         spin_lock_bh(qdisc_root_sleeping_lock(q));
 304 }
 305
 306 static inline void sch_tree_unlock(const struct Qdisc *q)
 307 {
 308         spin_unlock_bh(qdisc_root_sleeping_lock(q));
 309 }
 310
 311 #define tcf_tree_lock(tp)       sch_tree_lock((tp)->q)
 312 #define tcf_tree_unlock(tp)     sch_tree_unlock((tp)->q)
 313
 314 extern struct Qdisc noop_qdisc;
 315 extern struct Qdisc_ops noop_qdisc_ops;
 316 extern struct Qdisc_ops pfifo_fast_ops;
 317 extern struct Qdisc_ops mq_qdisc_ops;
 318
 319 struct Qdisc_class_common {
 320         u32                     classid;
 321         struct hlist_node       hnode;
 322 };
 323
 324 struct Qdisc_class_hash {
 325         struct hlist_head       *hash;
 326         unsigned int            hashsize;
 327         unsigned int            hashmask;
 328         unsigned int            hashelems;
 329 };
 330
 331 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
 332 {
 333         id ^= id >> 8;
 334         id ^= id >> 4;
 335         return id & mask;
 336 }
 337
 338 static inline struct Qdisc_class_common *
 339 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
 340 {
 341         struct Qdisc_class_common *cl;
 342         struct hlist_node *n;
 343         unsigned int h;
 344
 345         h = qdisc_class_hash(id, hash->hashmask);
 346         hlist_for_each_entry(cl, n, &hash->hash[h], hnode) {
 347                 if (cl->classid == id)
 348                         return cl;
 349         }
 350         return NULL;
 351 }
 352
 353 extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
 354 extern void qdisc_class_hash_insert(struct Qdisc_class_hash *, struct Qdisc_class_common *);
 355 extern void qdisc_class_hash_remove(struct Qdisc_class_hash *, struct Qdisc_class_common *);
 356 extern void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
 357 extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
 358
 359 extern void dev_init_scheduler(struct net_device *dev);
 360 extern void dev_shutdown(struct net_device *dev);
 361 extern void dev_activate(struct net_device *dev);
 362 extern void dev_deactivate(struct net_device *dev);
 363 extern void dev_deactivate_many(struct list_head *head);
 364 extern struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
 365                                      struct Qdisc *qdisc);
 366 extern void qdisc_reset(struct Qdisc *qdisc);
 367 extern void qdisc_destroy(struct Qdisc *qdisc);
 368 extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
 369 extern struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
 370                                  struct Qdisc_ops *ops);
 371 extern struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
 372                                        struct Qdisc_ops *ops, u32 parentid);
 373 extern void __qdisc_calculate_pkt_len(struct sk_buff *skb,
 374                                       const struct qdisc_size_table *stab);
 375 extern void tcf_destroy(struct tcf_proto *tp);
 376 extern void tcf_destroy_chain(struct tcf_proto **fl);
 377
 378 /* Reset all TX qdiscs greater then index of a device.  */
 379 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
 380 {
 381         struct Qdisc *qdisc;
 382
 383         for (; i < dev->num_tx_queues; i++) {
 384                 qdisc = netdev_get_tx_queue(dev, i)->qdisc;
 385                 if (qdisc) {
 386                         spin_lock_bh(qdisc_lock(qdisc));
 387                         qdisc_reset(qdisc);
 388                         spin_unlock_bh(qdisc_lock(qdisc));
 389                 }
 390         }
 391 }
 392
 393 static inline void qdisc_reset_all_tx(struct net_device *dev)
 394 {
 395         qdisc_reset_all_tx_gt(dev, 0);
 396 }
 397
 398 /* Are all TX queues of the device empty?  */
 399 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
 400 {
 401         unsigned int i;
 402         for (i = 0; i < dev->num_tx_queues; i++) {
 403                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
 404                 const struct Qdisc *q = txq->qdisc;
 405
 406                 if (q->q.qlen)
 407                         return false;
 408         }
 409         return true;
 410 }
 411
 412 /* Are any of the TX qdiscs changing?  */
 413 static inline bool qdisc_tx_changing(const struct net_device *dev)
 414 {
 415         unsigned int i;
 416         for (i = 0; i < dev->num_tx_queues; i++) {
 417                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
 418                 if (txq->qdisc != txq->qdisc_sleeping)
 419                         return true;
 420         }
 421         return false;
 422 }
 423
 424 /* Is the device using the noop qdisc on all queues?  */
 425 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
 426 {
 427         unsigned int i;
 428         for (i = 0; i < dev->num_tx_queues; i++) {
 429                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
 430                 if (txq->qdisc != &noop_qdisc)
 431                         return false;
 432         }
 433         return true;
 434 }
 435
 436 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
 437 {
 438         return qdisc_skb_cb(skb)->pkt_len;
 439 }
 440
 441 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
 442 enum net_xmit_qdisc_t {
 443         __NET_XMIT_STOLEN = 0x00010000,
 444         __NET_XMIT_BYPASS = 0x00020000,
 445 };
 446
 447 #ifdef CONFIG_NET_CLS_ACT
 448 #define net_xmit_drop_count(e)  ((e) & __NET_XMIT_STOLEN ? 0 : 1)
 449 #else
 450 #define net_xmit_drop_count(e)  (1)
 451 #endif
 452
 453 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
 454                                            const struct Qdisc *sch)
 455 {
 456 #ifdef CONFIG_NET_SCHED
 457         struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
 458
 459         if (stab)
 460                 __qdisc_calculate_pkt_len(skb, stab);
 461 #endif
 462 }
 463
 464 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
 465 {
 466         qdisc_calculate_pkt_len(skb, sch);
 467         return sch->enqueue(skb, sch);
 468 }
 469
 470 static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch)
 471 {
 472         qdisc_skb_cb(skb)->pkt_len = skb->len;
 473         return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
 474 }
 475
 476
 477 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
 478                                  const struct sk_buff *skb)
 479 {
 480         bstats->bytes += qdisc_pkt_len(skb);
 481         bstats->packets += skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1;
 482 }
 483
 484 static inline void qdisc_bstats_update(struct Qdisc *sch,
 485                                        const struct sk_buff *skb)
 486 {
 487         bstats_update(&sch->bstats, skb);
 488 }
 489
 490 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
 491                                        struct sk_buff_head *list)
 492 {
 493         __skb_queue_tail(list, skb);
 494         sch->qstats.backlog += qdisc_pkt_len(skb);
 495
 496         return NET_XMIT_SUCCESS;
 497 }
 498
 499 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
 500 {
 501         return __qdisc_enqueue_tail(skb, sch, &sch->q);
 502 }
 503
 504 static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
 505                                                    struct sk_buff_head *list)
 506 {
 507         struct sk_buff *skb = __skb_dequeue(list);
 508
 509         if (likely(skb != NULL)) {
 510                 sch->qstats.backlog -= qdisc_pkt_len(skb);
 511                 qdisc_bstats_update(sch, skb);
 512         }
 513
 514         return skb;
 515 }
 516
 517 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
 518 {
 519         return __qdisc_dequeue_head(sch, &sch->q);
 520 }
 521
 522 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
 523                                               struct sk_buff_head *list)
 524 {
 525         struct sk_buff *skb = __skb_dequeue(list);
 526
 527         if (likely(skb != NULL)) {
 528                 unsigned int len = qdisc_pkt_len(skb);
 529                 sch->qstats.backlog -= len;
 530                 kfree_skb(skb);
 531                 return len;
 532         }
 533
 534         return 0;
 535 }
 536
 537 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch)
 538 {
 539         return __qdisc_queue_drop_head(sch, &sch->q);
 540 }
 541
 542 static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
 543                                                    struct sk_buff_head *list)
 544 {
 545         struct sk_buff *skb = __skb_dequeue_tail(list);
 546
 547         if (likely(skb != NULL))
 548                 sch->qstats.backlog -= qdisc_pkt_len(skb);
 549
 550         return skb;
 551 }
 552
 553 static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
 554 {
 555         return __qdisc_dequeue_tail(sch, &sch->q);
 556 }
 557
 558 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
 559 {
 560         return skb_peek(&sch->q);
 561 }
 562
 563 /* generic pseudo peek method for non-work-conserving qdisc */
 564 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
 565 {
 566         /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
 567         if (!sch->gso_skb) {
 568                 sch->gso_skb = sch->dequeue(sch);
 569                 if (sch->gso_skb)
 570                         /* it's still part of the queue */
 571                         sch->q.qlen++;
 572         }
 573
 574         return sch->gso_skb;
 575 }
 576
 577 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
 578 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
 579 {
 580         struct sk_buff *skb = sch->gso_skb;
 581
 582         if (skb) {
 583                 sch->gso_skb = NULL;
 584                 sch->q.qlen--;
 585         } else {
 586                 skb = sch->dequeue(sch);
 587         }
 588
 589         return skb;
 590 }
 591
 592 static inline void __qdisc_reset_queue(struct Qdisc *sch,
 593                                        struct sk_buff_head *list)
 594 {
 595         /*
 596          * We do not know the backlog in bytes of this list, it
 597          * is up to the caller to correct it
 598          */
 599         __skb_queue_purge(list);
 600 }
 601
 602 static inline void qdisc_reset_queue(struct Qdisc *sch)
 603 {
 604         __qdisc_reset_queue(sch, &sch->q);
 605         sch->qstats.backlog = 0;
 606 }
 607
 608 static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
 609                                               struct sk_buff_head *list)
 610 {
 611         struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
 612
 613         if (likely(skb != NULL)) {
 614                 unsigned int len = qdisc_pkt_len(skb);
 615                 kfree_skb(skb);
 616                 return len;
 617         }
 618
 619         return 0;
 620 }
 621
 622 static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
 623 {
 624         return __qdisc_queue_drop(sch, &sch->q);
 625 }
 626
 627 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
 628 {
 629         kfree_skb(skb);
 630         sch->qstats.drops++;
 631
 632         return NET_XMIT_DROP;
 633 }
 634
 635 static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
 636 {
 637         sch->qstats.drops++;
 638
 639 #ifdef CONFIG_NET_CLS_ACT
 640         if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
 641                 goto drop;
 642
 643         return NET_XMIT_SUCCESS;
 644
 645 drop:
 646 #endif
 647         kfree_skb(skb);
 648         return NET_XMIT_DROP;
 649 }
 650
 651 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
 652    long it will take to send a packet given its size.
 653  */
 654 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
 655 {
 656         int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
 657         if (slot < 0)
 658                 slot = 0;
 659         slot >>= rtab->rate.cell_log;
 660         if (slot > 255)
 661                 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
 662         return rtab->data[slot];
 663 }
 664
 665 #ifdef CONFIG_NET_CLS_ACT
 666 static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask,
 667                                             int action)
 668 {
 669         struct sk_buff *n;
 670
 671         n = skb_clone(skb, gfp_mask);
 672
 673         if (n) {
 674                 n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
 675                 n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
 676                 n->tc_verd = CLR_TC_MUNGED(n->tc_verd);
 677         }
 678         return n;
 679 }
 680 #endif
 681
 682 struct psched_ratecfg {
 683         u64 rate_bps;
 684         u32 mult;
 685         u32 shift;
 686 };
 687
 688 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
 689                                 unsigned int len)
 690 {
 691         return ((u64)len * r->mult) >> r->shift;
 692 }
 693
 694 extern void psched_ratecfg_precompute(struct psched_ratecfg *r, u32 rate);
 695
 696 static inline u32 psched_ratecfg_getrate(const struct psched_ratecfg *r)
 697 {
 698         return r->rate_bps >> 3;
 699 }
 700
 701 #endif