include/net/sch_generic.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __NET_SCHED_GENERIC_H
   3 #define __NET_SCHED_GENERIC_H
   4
   5 #include <linux/netdevice.h>
   6 #include <linux/types.h>
   7 #include <linux/rcupdate.h>
   8 #include <linux/pkt_sched.h>
   9 #include <linux/pkt_cls.h>
  10 #include <linux/percpu.h>
  11 #include <linux/dynamic_queue_limits.h>
  12 #include <linux/list.h>
  13 #include <linux/refcount.h>
  14 #include <linux/workqueue.h>
  15 #include <linux/mutex.h>
  16 #include <linux/rwsem.h>
  17 #include <linux/atomic.h>
  18 #include <linux/hashtable.h>
  19 #include <net/gen_stats.h>
  20 #include <net/rtnetlink.h>
  21 #include <net/flow_offload.h>
  22
  23 struct Qdisc_ops;
  24 struct qdisc_walker;
  25 struct tcf_walker;
  26 struct module;
  27 struct bpf_flow_keys;
  28
  29 struct qdisc_rate_table {
  30         struct tc_ratespec rate;
  31         u32             data[256];
  32         struct qdisc_rate_table *next;
  33         int             refcnt;
  34 };
  35
  36 enum qdisc_state_t {
  37         __QDISC_STATE_SCHED,
  38         __QDISC_STATE_DEACTIVATED,
  39 };
  40
  41 struct qdisc_size_table {
  42         struct rcu_head         rcu;
  43         struct list_head        list;
  44         struct tc_sizespec      szopts;
  45         int                     refcnt;
  46         u16                     data[];
  47 };
  48
  49 /* similar to sk_buff_head, but skb->prev pointer is undefined. */
  50 struct qdisc_skb_head {
  51         struct sk_buff  *head;
  52         struct sk_buff  *tail;
  53         __u32           qlen;
  54         spinlock_t      lock;
  55 };
  56
  57 struct Qdisc {
  58         int                     (*enqueue)(struct sk_buff *skb,
  59                                            struct Qdisc *sch,
  60                                            struct sk_buff **to_free);
  61         struct sk_buff *        (*dequeue)(struct Qdisc *sch);
  62         unsigned int            flags;
  63 #define TCQ_F_BUILTIN           1
  64 #define TCQ_F_INGRESS           2
  65 #define TCQ_F_CAN_BYPASS        4
  66 #define TCQ_F_MQROOT            8
  67 #define TCQ_F_ONETXQUEUE        0x10 /* dequeue_skb() can assume all skbs are for
  68                                       * q->dev_queue : It can test
  69                                       * netif_xmit_frozen_or_stopped() before
  70                                       * dequeueing next packet.
  71                                       * Its true for MQ/MQPRIO slaves, or non
  72                                       * multiqueue device.
  73                                       */
  74 #define TCQ_F_WARN_NONWC        (1 << 16)
  75 #define TCQ_F_CPUSTATS          0x20 /* run using percpu statistics */
  76 #define TCQ_F_NOPARENT          0x40 /* root of its hierarchy :
  77                                       * qdisc_tree_decrease_qlen() should stop.
  78                                       */
  79 #define TCQ_F_INVISIBLE         0x80 /* invisible by default in dump */
  80 #define TCQ_F_NOLOCK            0x100 /* qdisc does not require locking */
  81 #define TCQ_F_OFFLOADED         0x200 /* qdisc is offloaded to HW */
  82         u32                     limit;
  83         const struct Qdisc_ops  *ops;
  84         struct qdisc_size_table __rcu *stab;
  85         struct hlist_node       hash;
  86         u32                     handle;
  87         u32                     parent;
  88
  89         struct netdev_queue     *dev_queue;
  90
  91         struct net_rate_estimator __rcu *rate_est;
  92         struct gnet_stats_basic_cpu __percpu *cpu_bstats;
  93         struct gnet_stats_queue __percpu *cpu_qstats;
  94         int                     padded;
  95         refcount_t              refcnt;
  96
  97         /*
  98          * For performance sake on SMP, we put highly modified fields at the end
  99          */
 100         struct sk_buff_head     gso_skb ____cacheline_aligned_in_smp;
 101         struct qdisc_skb_head   q;
 102         struct gnet_stats_basic_packed bstats;
 103         seqcount_t              running;
 104         struct gnet_stats_queue qstats;
 105         unsigned long           state;
 106         struct Qdisc            *next_sched;
 107         struct sk_buff_head     skb_bad_txq;
 108
 109         spinlock_t              busylock ____cacheline_aligned_in_smp;
 110         spinlock_t              seqlock;
 111
 112         /* for NOLOCK qdisc, true if there are no enqueued skbs */
 113         bool                    empty;
 114         struct rcu_head         rcu;
 115 };
 116
 117 static inline void qdisc_refcount_inc(struct Qdisc *qdisc)
 118 {
 119         if (qdisc->flags & TCQ_F_BUILTIN)
 120                 return;
 121         refcount_inc(&qdisc->refcnt);
 122 }
 123
 124 /* Intended to be used by unlocked users, when concurrent qdisc release is
 125  * possible.
 126  */
 127
 128 static inline struct Qdisc *qdisc_refcount_inc_nz(struct Qdisc *qdisc)
 129 {
 130         if (qdisc->flags & TCQ_F_BUILTIN)
 131                 return qdisc;
 132         if (refcount_inc_not_zero(&qdisc->refcnt))
 133                 return qdisc;
 134         return NULL;
 135 }
 136
 137 static inline bool qdisc_is_running(struct Qdisc *qdisc)
 138 {
 139         if (qdisc->flags & TCQ_F_NOLOCK)
 140                 return spin_is_locked(&qdisc->seqlock);
 141         return (raw_read_seqcount(&qdisc->running) & 1) ? true : false;
 142 }
 143
 144 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
 145 {
 146         return q->flags & TCQ_F_CPUSTATS;
 147 }
 148
 149 static inline bool qdisc_is_empty(const struct Qdisc *qdisc)
 150 {
 151         if (qdisc_is_percpu_stats(qdisc))
 152                 return READ_ONCE(qdisc->empty);
 153         return !READ_ONCE(qdisc->q.qlen);
 154 }
 155
 156 static inline bool qdisc_run_begin(struct Qdisc *qdisc)
 157 {
 158         if (qdisc->flags & TCQ_F_NOLOCK) {
 159                 if (!spin_trylock(&qdisc->seqlock))
 160                         return false;
 161                 WRITE_ONCE(qdisc->empty, false);
 162         } else if (qdisc_is_running(qdisc)) {
 163                 return false;
 164         }
 165         /* Variant of write_seqcount_begin() telling lockdep a trylock
 166          * was attempted.
 167          */
 168         raw_write_seqcount_begin(&qdisc->running);
 169         seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_);
 170         return true;
 171 }
 172
 173 static inline void qdisc_run_end(struct Qdisc *qdisc)
 174 {
 175         write_seqcount_end(&qdisc->running);
 176         if (qdisc->flags & TCQ_F_NOLOCK)
 177                 spin_unlock(&qdisc->seqlock);
 178 }
 179
 180 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
 181 {
 182         return qdisc->flags & TCQ_F_ONETXQUEUE;
 183 }
 184
 185 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
 186 {
 187 #ifdef CONFIG_BQL
 188         /* Non-BQL migrated drivers will return 0, too. */
 189         return dql_avail(&txq->dql);
 190 #else
 191         return 0;
 192 #endif
 193 }
 194
 195 struct Qdisc_class_ops {
 196         unsigned int            flags;
 197         /* Child qdisc manipulation */
 198         struct netdev_queue *   (*select_queue)(struct Qdisc *, struct tcmsg *);
 199         int                     (*graft)(struct Qdisc *, unsigned long cl,
 200                                         struct Qdisc *, struct Qdisc **,
 201                                         struct netlink_ext_ack *extack);
 202         struct Qdisc *          (*leaf)(struct Qdisc *, unsigned long cl);
 203         void                    (*qlen_notify)(struct Qdisc *, unsigned long);
 204
 205         /* Class manipulation routines */
 206         unsigned long           (*find)(struct Qdisc *, u32 classid);
 207         int                     (*change)(struct Qdisc *, u32, u32,
 208                                         struct nlattr **, unsigned long *,
 209                                         struct netlink_ext_ack *);
 210         int                     (*delete)(struct Qdisc *, unsigned long);
 211         void                    (*walk)(struct Qdisc *, struct qdisc_walker * arg);
 212
 213         /* Filter manipulation */
 214         struct tcf_block *      (*tcf_block)(struct Qdisc *sch,
 215                                              unsigned long arg,
 216                                              struct netlink_ext_ack *extack);
 217         unsigned long           (*bind_tcf)(struct Qdisc *, unsigned long,
 218                                         u32 classid);
 219         void                    (*unbind_tcf)(struct Qdisc *, unsigned long);
 220
 221         /* rtnetlink specific */
 222         int                     (*dump)(struct Qdisc *, unsigned long,
 223                                         struct sk_buff *skb, struct tcmsg*);
 224         int                     (*dump_stats)(struct Qdisc *, unsigned long,
 225                                         struct gnet_dump *);
 226 };
 227
 228 /* Qdisc_class_ops flag values */
 229
 230 /* Implements API that doesn't require rtnl lock */
 231 enum qdisc_class_ops_flags {
 232         QDISC_CLASS_OPS_DOIT_UNLOCKED = 1,
 233 };
 234
 235 struct Qdisc_ops {
 236         struct Qdisc_ops        *next;
 237         const struct Qdisc_class_ops    *cl_ops;
 238         char                    id[IFNAMSIZ];
 239         int                     priv_size;
 240         unsigned int            static_flags;
 241
 242         int                     (*enqueue)(struct sk_buff *skb,
 243                                            struct Qdisc *sch,
 244                                            struct sk_buff **to_free);
 245         struct sk_buff *        (*dequeue)(struct Qdisc *);
 246         struct sk_buff *        (*peek)(struct Qdisc *);
 247
 248         int                     (*init)(struct Qdisc *sch, struct nlattr *arg,
 249                                         struct netlink_ext_ack *extack);
 250         void                    (*reset)(struct Qdisc *);
 251         void                    (*destroy)(struct Qdisc *);
 252         int                     (*change)(struct Qdisc *sch,
 253                                           struct nlattr *arg,
 254                                           struct netlink_ext_ack *extack);
 255         void                    (*attach)(struct Qdisc *sch);
 256         int                     (*change_tx_queue_len)(struct Qdisc *, unsigned int);
 257
 258         int                     (*dump)(struct Qdisc *, struct sk_buff *);
 259         int                     (*dump_stats)(struct Qdisc *, struct gnet_dump *);
 260
 261         void                    (*ingress_block_set)(struct Qdisc *sch,
 262                                                      u32 block_index);
 263         void                    (*egress_block_set)(struct Qdisc *sch,
 264                                                     u32 block_index);
 265         u32                     (*ingress_block_get)(struct Qdisc *sch);
 266         u32                     (*egress_block_get)(struct Qdisc *sch);
 267
 268         struct module           *owner;
 269 };
 270
 271
 272 struct tcf_result {
 273         union {
 274                 struct {
 275                         unsigned long   class;
 276                         u32             classid;
 277                 };
 278                 const struct tcf_proto *goto_tp;
 279
 280                 /* used in the skb_tc_reinsert function */
 281                 struct {
 282                         bool            ingress;
 283                         struct gnet_stats_queue *qstats;
 284                 };
 285         };
 286 };
 287
 288 struct tcf_chain;
 289
 290 struct tcf_proto_ops {
 291         struct list_head        head;
 292         char                    kind[IFNAMSIZ];
 293
 294         int                     (*classify)(struct sk_buff *,
 295                                             const struct tcf_proto *,
 296                                             struct tcf_result *);
 297         int                     (*init)(struct tcf_proto*);
 298         void                    (*destroy)(struct tcf_proto *tp, bool rtnl_held,
 299                                            struct netlink_ext_ack *extack);
 300
 301         void*                   (*get)(struct tcf_proto*, u32 handle);
 302         void                    (*put)(struct tcf_proto *tp, void *f);
 303         int                     (*change)(struct net *net, struct sk_buff *,
 304                                         struct tcf_proto*, unsigned long,
 305                                         u32 handle, struct nlattr **,
 306                                         void **, bool, bool,
 307                                         struct netlink_ext_ack *);
 308         int                     (*delete)(struct tcf_proto *tp, void *arg,
 309                                           bool *last, bool rtnl_held,
 310                                           struct netlink_ext_ack *);
 311         bool                    (*delete_empty)(struct tcf_proto *tp);
 312         void                    (*walk)(struct tcf_proto *tp,
 313                                         struct tcf_walker *arg, bool rtnl_held);
 314         int                     (*reoffload)(struct tcf_proto *tp, bool add,
 315                                              flow_setup_cb_t *cb, void *cb_priv,
 316                                              struct netlink_ext_ack *extack);
 317         void                    (*hw_add)(struct tcf_proto *tp,
 318                                           void *type_data);
 319         void                    (*hw_del)(struct tcf_proto *tp,
 320                                           void *type_data);
 321         void                    (*bind_class)(void *, u32, unsigned long,
 322                                               void *, unsigned long);
 323         void *                  (*tmplt_create)(struct net *net,
 324                                                 struct tcf_chain *chain,
 325                                                 struct nlattr **tca,
 326                                                 struct netlink_ext_ack *extack);
 327         void                    (*tmplt_destroy)(void *tmplt_priv);
 328
 329         /* rtnetlink specific */
 330         int                     (*dump)(struct net*, struct tcf_proto*, void *,
 331                                         struct sk_buff *skb, struct tcmsg*,
 332                                         bool);
 333         int                     (*tmplt_dump)(struct sk_buff *skb,
 334                                               struct net *net,
 335                                               void *tmplt_priv);
 336
 337         struct module           *owner;
 338         int                     flags;
 339 };
 340
 341 /* Classifiers setting TCF_PROTO_OPS_DOIT_UNLOCKED in tcf_proto_ops->flags
 342  * are expected to implement tcf_proto_ops->delete_empty(), otherwise race
 343  * conditions can occur when filters are inserted/deleted simultaneously.
 344  */
 345 enum tcf_proto_ops_flags {
 346         TCF_PROTO_OPS_DOIT_UNLOCKED = 1,
 347 };
 348
 349 struct tcf_proto {
 350         /* Fast access part */
 351         struct tcf_proto __rcu  *next;
 352         void __rcu              *root;
 353
 354         /* called under RCU BH lock*/
 355         int                     (*classify)(struct sk_buff *,
 356                                             const struct tcf_proto *,
 357                                             struct tcf_result *);
 358         __be16                  protocol;
 359
 360         /* All the rest */
 361         u32                     prio;
 362         void                    *data;
 363         const struct tcf_proto_ops      *ops;
 364         struct tcf_chain        *chain;
 365         /* Lock protects tcf_proto shared state and can be used by unlocked
 366          * classifiers to protect their private data.
 367          */
 368         spinlock_t              lock;
 369         bool                    deleting;
 370         refcount_t              refcnt;
 371         struct rcu_head         rcu;
 372         struct hlist_node       destroy_ht_node;
 373 };
 374
 375 struct qdisc_skb_cb {
 376         struct {
 377                 unsigned int            pkt_len;
 378                 u16                     slave_dev_queue_mapping;
 379                 u16                     tc_classid;
 380         };
 381 #define QDISC_CB_PRIV_LEN 20
 382         unsigned char           data[QDISC_CB_PRIV_LEN];
 383 };
 384
 385 typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv);
 386
 387 struct tcf_chain {
 388         /* Protects filter_chain. */
 389         struct mutex filter_chain_lock;
 390         struct tcf_proto __rcu *filter_chain;
 391         struct list_head list;
 392         struct tcf_block *block;
 393         u32 index; /* chain index */
 394         unsigned int refcnt;
 395         unsigned int action_refcnt;
 396         bool explicitly_created;
 397         bool flushing;
 398         const struct tcf_proto_ops *tmplt_ops;
 399         void *tmplt_priv;
 400         struct rcu_head rcu;
 401 };
 402
 403 struct tcf_block {
 404         /* Lock protects tcf_block and lifetime-management data of chains
 405          * attached to the block (refcnt, action_refcnt, explicitly_created).
 406          */
 407         struct mutex lock;
 408         struct list_head chain_list;
 409         u32 index; /* block index for shared blocks */
 410         refcount_t refcnt;
 411         struct net *net;
 412         struct Qdisc *q;
 413         struct rw_semaphore cb_lock; /* protects cb_list and offload counters */
 414         struct flow_block flow_block;
 415         struct list_head owner_list;
 416         bool keep_dst;
 417         atomic_t offloadcnt; /* Number of oddloaded filters */
 418         unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */
 419         unsigned int lockeddevcnt; /* Number of devs that require rtnl lock. */
 420         struct {
 421                 struct tcf_chain *chain;
 422                 struct list_head filter_chain_list;
 423         } chain0;
 424         struct rcu_head rcu;
 425         DECLARE_HASHTABLE(proto_destroy_ht, 7);
 426         struct mutex proto_destroy_lock; /* Lock for proto_destroy hashtable. */
 427 };
 428
 429 #ifdef CONFIG_PROVE_LOCKING
 430 static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain)
 431 {
 432         return lockdep_is_held(&chain->filter_chain_lock);
 433 }
 434
 435 static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp)
 436 {
 437         return lockdep_is_held(&tp->lock);
 438 }
 439 #else
 440 static inline bool lockdep_tcf_chain_is_locked(struct tcf_block *chain)
 441 {
 442         return true;
 443 }
 444
 445 static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp)
 446 {
 447         return true;
 448 }
 449 #endif /* #ifdef CONFIG_PROVE_LOCKING */
 450
 451 #define tcf_chain_dereference(p, chain)                                 \
 452         rcu_dereference_protected(p, lockdep_tcf_chain_is_locked(chain))
 453
 454 #define tcf_proto_dereference(p, tp)                                    \
 455         rcu_dereference_protected(p, lockdep_tcf_proto_is_locked(tp))
 456
 457 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
 458 {
 459         struct qdisc_skb_cb *qcb;
 460
 461         BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
 462         BUILD_BUG_ON(sizeof(qcb->data) < sz);
 463 }
 464
 465 static inline int qdisc_qlen_cpu(const struct Qdisc *q)
 466 {
 467         return this_cpu_ptr(q->cpu_qstats)->qlen;
 468 }
 469
 470 static inline int qdisc_qlen(const struct Qdisc *q)
 471 {
 472         return q->q.qlen;
 473 }
 474
 475 static inline int qdisc_qlen_sum(const struct Qdisc *q)
 476 {
 477         __u32 qlen = q->qstats.qlen;
 478         int i;
 479
 480         if (qdisc_is_percpu_stats(q)) {
 481                 for_each_possible_cpu(i)
 482                         qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen;
 483         } else {
 484                 qlen += q->q.qlen;
 485         }
 486
 487         return qlen;
 488 }
 489
 490 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
 491 {
 492         return (struct qdisc_skb_cb *)skb->cb;
 493 }
 494
 495 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
 496 {
 497         return &qdisc->q.lock;
 498 }
 499
 500 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
 501 {
 502         struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
 503
 504         return q;
 505 }
 506
 507 static inline struct Qdisc *qdisc_root_bh(const struct Qdisc *qdisc)
 508 {
 509         return rcu_dereference_bh(qdisc->dev_queue->qdisc);
 510 }
 511
 512 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
 513 {
 514         return qdisc->dev_queue->qdisc_sleeping;
 515 }
 516
 517 /* The qdisc root lock is a mechanism by which to top level
 518  * of a qdisc tree can be locked from any qdisc node in the
 519  * forest.  This allows changing the configuration of some
 520  * aspect of the qdisc tree while blocking out asynchronous
 521  * qdisc access in the packet processing paths.
 522  *
 523  * It is only legal to do this when the root will not change
 524  * on us.  Otherwise we'll potentially lock the wrong qdisc
 525  * root.  This is enforced by holding the RTNL semaphore, which
 526  * all users of this lock accessor must do.
 527  */
 528 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
 529 {
 530         struct Qdisc *root = qdisc_root(qdisc);
 531
 532         ASSERT_RTNL();
 533         return qdisc_lock(root);
 534 }
 535
 536 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
 537 {
 538         struct Qdisc *root = qdisc_root_sleeping(qdisc);
 539
 540         ASSERT_RTNL();
 541         return qdisc_lock(root);
 542 }
 543
 544 static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
 545 {
 546         struct Qdisc *root = qdisc_root_sleeping(qdisc);
 547
 548         ASSERT_RTNL();
 549         return &root->running;
 550 }
 551
 552 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
 553 {
 554         return qdisc->dev_queue->dev;
 555 }
 556
 557 static inline void sch_tree_lock(const struct Qdisc *q)
 558 {
 559         spin_lock_bh(qdisc_root_sleeping_lock(q));
 560 }
 561
 562 static inline void sch_tree_unlock(const struct Qdisc *q)
 563 {
 564         spin_unlock_bh(qdisc_root_sleeping_lock(q));
 565 }
 566
 567 extern struct Qdisc noop_qdisc;
 568 extern struct Qdisc_ops noop_qdisc_ops;
 569 extern struct Qdisc_ops pfifo_fast_ops;
 570 extern struct Qdisc_ops mq_qdisc_ops;
 571 extern struct Qdisc_ops noqueue_qdisc_ops;
 572 extern const struct Qdisc_ops *default_qdisc_ops;
 573 static inline const struct Qdisc_ops *
 574 get_default_qdisc_ops(const struct net_device *dev, int ntx)
 575 {
 576         return ntx < dev->real_num_tx_queues ?
 577                         default_qdisc_ops : &pfifo_fast_ops;
 578 }
 579
 580 struct Qdisc_class_common {
 581         u32                     classid;
 582         struct hlist_node       hnode;
 583 };
 584
 585 struct Qdisc_class_hash {
 586         struct hlist_head       *hash;
 587         unsigned int            hashsize;
 588         unsigned int            hashmask;
 589         unsigned int            hashelems;
 590 };
 591
 592 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
 593 {
 594         id ^= id >> 8;
 595         id ^= id >> 4;
 596         return id & mask;
 597 }
 598
 599 static inline struct Qdisc_class_common *
 600 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
 601 {
 602         struct Qdisc_class_common *cl;
 603         unsigned int h;
 604
 605         if (!id)
 606                 return NULL;
 607
 608         h = qdisc_class_hash(id, hash->hashmask);
 609         hlist_for_each_entry(cl, &hash->hash[h], hnode) {
 610                 if (cl->classid == id)
 611                         return cl;
 612         }
 613         return NULL;
 614 }
 615
 616 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid)
 617 {
 618         u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY;
 619
 620         return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL;
 621 }
 622
 623 int qdisc_class_hash_init(struct Qdisc_class_hash *);
 624 void qdisc_class_hash_insert(struct Qdisc_class_hash *,
 625                              struct Qdisc_class_common *);
 626 void qdisc_class_hash_remove(struct Qdisc_class_hash *,
 627                              struct Qdisc_class_common *);
 628 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
 629 void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
 630
 631 int dev_qdisc_change_tx_queue_len(struct net_device *dev);
 632 void dev_init_scheduler(struct net_device *dev);
 633 void dev_shutdown(struct net_device *dev);
 634 void dev_activate(struct net_device *dev);
 635 void dev_deactivate(struct net_device *dev);
 636 void dev_deactivate_many(struct list_head *head);
 637 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
 638                               struct Qdisc *qdisc);
 639 void qdisc_reset(struct Qdisc *qdisc);
 640 void qdisc_put(struct Qdisc *qdisc);
 641 void qdisc_put_unlocked(struct Qdisc *qdisc);
 642 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len);
 643 #ifdef CONFIG_NET_SCHED
 644 int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
 645                               void *type_data);
 646 void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
 647                                 struct Qdisc *new, struct Qdisc *old,
 648                                 enum tc_setup_type type, void *type_data,
 649                                 struct netlink_ext_ack *extack);
 650 #else
 651 static inline int
 652 qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type,
 653                           void *type_data)
 654 {
 655         q->flags &= ~TCQ_F_OFFLOADED;
 656         return 0;
 657 }
 658
 659 static inline void
 660 qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
 661                            struct Qdisc *new, struct Qdisc *old,
 662                            enum tc_setup_type type, void *type_data,
 663                            struct netlink_ext_ack *extack)
 664 {
 665 }
 666 #endif
 667 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
 668                           const struct Qdisc_ops *ops,
 669                           struct netlink_ext_ack *extack);
 670 void qdisc_free(struct Qdisc *qdisc);
 671 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
 672                                 const struct Qdisc_ops *ops, u32 parentid,
 673                                 struct netlink_ext_ack *extack);
 674 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
 675                                const struct qdisc_size_table *stab);
 676 int skb_do_redirect(struct sk_buff *);
 677
 678 static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
 679 {
 680 #ifdef CONFIG_NET_CLS_ACT
 681         return skb->tc_at_ingress;
 682 #else
 683         return false;
 684 #endif
 685 }
 686
 687 static inline bool skb_skip_tc_classify(struct sk_buff *skb)
 688 {
 689 #ifdef CONFIG_NET_CLS_ACT
 690         if (skb->tc_skip_classify) {
 691                 skb->tc_skip_classify = 0;
 692                 return true;
 693         }
 694 #endif
 695         return false;
 696 }
 697
 698 /* Reset all TX qdiscs greater than index of a device.  */
 699 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
 700 {
 701         struct Qdisc *qdisc;
 702
 703         for (; i < dev->num_tx_queues; i++) {
 704                 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
 705                 if (qdisc) {
 706                         spin_lock_bh(qdisc_lock(qdisc));
 707                         qdisc_reset(qdisc);
 708                         spin_unlock_bh(qdisc_lock(qdisc));
 709                 }
 710         }
 711 }
 712
 713 static inline void qdisc_reset_all_tx(struct net_device *dev)
 714 {
 715         qdisc_reset_all_tx_gt(dev, 0);
 716 }
 717
 718 /* Are all TX queues of the device empty?  */
 719 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
 720 {
 721         unsigned int i;
 722
 723         rcu_read_lock();
 724         for (i = 0; i < dev->num_tx_queues; i++) {
 725                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
 726                 const struct Qdisc *q = rcu_dereference(txq->qdisc);
 727
 728                 if (!qdisc_is_empty(q)) {
 729                         rcu_read_unlock();
 730                         return false;
 731                 }
 732         }
 733         rcu_read_unlock();
 734         return true;
 735 }
 736
 737 /* Are any of the TX qdiscs changing?  */
 738 static inline bool qdisc_tx_changing(const struct net_device *dev)
 739 {
 740         unsigned int i;
 741
 742         for (i = 0; i < dev->num_tx_queues; i++) {
 743                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
 744                 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
 745                         return true;
 746         }
 747         return false;
 748 }
 749
 750 /* Is the device using the noop qdisc on all queues?  */
 751 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
 752 {
 753         unsigned int i;
 754
 755         for (i = 0; i < dev->num_tx_queues; i++) {
 756                 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
 757                 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
 758                         return false;
 759         }
 760         return true;
 761 }
 762
 763 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
 764 {
 765         return qdisc_skb_cb(skb)->pkt_len;
 766 }
 767
 768 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
 769 enum net_xmit_qdisc_t {
 770         __NET_XMIT_STOLEN = 0x00010000,
 771         __NET_XMIT_BYPASS = 0x00020000,
 772 };
 773
 774 #ifdef CONFIG_NET_CLS_ACT
 775 #define net_xmit_drop_count(e)  ((e) & __NET_XMIT_STOLEN ? 0 : 1)
 776 #else
 777 #define net_xmit_drop_count(e)  (1)
 778 #endif
 779
 780 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
 781                                            const struct Qdisc *sch)
 782 {
 783 #ifdef CONFIG_NET_SCHED
 784         struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
 785
 786         if (stab)
 787                 __qdisc_calculate_pkt_len(skb, stab);
 788 #endif
 789 }
 790
 791 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
 792                                 struct sk_buff **to_free)
 793 {
 794         qdisc_calculate_pkt_len(skb, sch);
 795         return sch->enqueue(skb, sch, to_free);
 796 }
 797
 798 static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
 799                                   __u64 bytes, __u32 packets)
 800 {
 801         bstats->bytes += bytes;
 802         bstats->packets += packets;
 803 }
 804
 805 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
 806                                  const struct sk_buff *skb)
 807 {
 808         _bstats_update(bstats,
 809                        qdisc_pkt_len(skb),
 810                        skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
 811 }
 812
 813 static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
 814                                       __u64 bytes, __u32 packets)
 815 {
 816         u64_stats_update_begin(&bstats->syncp);
 817         _bstats_update(&bstats->bstats, bytes, packets);
 818         u64_stats_update_end(&bstats->syncp);
 819 }
 820
 821 static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
 822                                      const struct sk_buff *skb)
 823 {
 824         u64_stats_update_begin(&bstats->syncp);
 825         bstats_update(&bstats->bstats, skb);
 826         u64_stats_update_end(&bstats->syncp);
 827 }
 828
 829 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
 830                                            const struct sk_buff *skb)
 831 {
 832         bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
 833 }
 834
 835 static inline void qdisc_bstats_update(struct Qdisc *sch,
 836                                        const struct sk_buff *skb)
 837 {
 838         bstats_update(&sch->bstats, skb);
 839 }
 840
 841 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
 842                                             const struct sk_buff *skb)
 843 {
 844         sch->qstats.backlog -= qdisc_pkt_len(skb);
 845 }
 846
 847 static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch,
 848                                                 const struct sk_buff *skb)
 849 {
 850         this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
 851 }
 852
 853 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
 854                                             const struct sk_buff *skb)
 855 {
 856         sch->qstats.backlog += qdisc_pkt_len(skb);
 857 }
 858
 859 static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch,
 860                                                 const struct sk_buff *skb)
 861 {
 862         this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb));
 863 }
 864
 865 static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch)
 866 {
 867         this_cpu_inc(sch->cpu_qstats->qlen);
 868 }
 869
 870 static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch)
 871 {
 872         this_cpu_dec(sch->cpu_qstats->qlen);
 873 }
 874
 875 static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch)
 876 {
 877         this_cpu_inc(sch->cpu_qstats->requeues);
 878 }
 879
 880 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
 881 {
 882         sch->qstats.drops += count;
 883 }
 884
 885 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
 886 {
 887         qstats->drops++;
 888 }
 889
 890 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
 891 {
 892         qstats->overlimits++;
 893 }
 894
 895 static inline void qdisc_qstats_drop(struct Qdisc *sch)
 896 {
 897         qstats_drop_inc(&sch->qstats);
 898 }
 899
 900 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
 901 {
 902         this_cpu_inc(sch->cpu_qstats->drops);
 903 }
 904
 905 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
 906 {
 907         sch->qstats.overlimits++;
 908 }
 909
 910 static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch)
 911 {
 912         __u32 qlen = qdisc_qlen_sum(sch);
 913
 914         return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen);
 915 }
 916
 917 static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch,  __u32 *qlen,
 918                                              __u32 *backlog)
 919 {
 920         struct gnet_stats_queue qstats = { 0 };
 921         __u32 len = qdisc_qlen_sum(sch);
 922
 923         __gnet_stats_copy_queue(&qstats, sch->cpu_qstats, &sch->qstats, len);
 924         *qlen = qstats.qlen;
 925         *backlog = qstats.backlog;
 926 }
 927
 928 static inline void qdisc_tree_flush_backlog(struct Qdisc *sch)
 929 {
 930         __u32 qlen, backlog;
 931
 932         qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
 933         qdisc_tree_reduce_backlog(sch, qlen, backlog);
 934 }
 935
 936 static inline void qdisc_purge_queue(struct Qdisc *sch)
 937 {
 938         __u32 qlen, backlog;
 939
 940         qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
 941         qdisc_reset(sch);
 942         qdisc_tree_reduce_backlog(sch, qlen, backlog);
 943 }
 944
 945 static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
 946 {
 947         qh->head = NULL;
 948         qh->tail = NULL;
 949         qh->qlen = 0;
 950 }
 951
 952 static inline void __qdisc_enqueue_tail(struct sk_buff *skb,
 953                                         struct qdisc_skb_head *qh)
 954 {
 955         struct sk_buff *last = qh->tail;
 956
 957         if (last) {
 958                 skb->next = NULL;
 959                 last->next = skb;
 960                 qh->tail = skb;
 961         } else {
 962                 qh->tail = skb;
 963                 qh->head = skb;
 964         }
 965         qh->qlen++;
 966 }
 967
 968 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
 969 {
 970         __qdisc_enqueue_tail(skb, &sch->q);
 971         qdisc_qstats_backlog_inc(sch, skb);
 972         return NET_XMIT_SUCCESS;
 973 }
 974
 975 static inline void __qdisc_enqueue_head(struct sk_buff *skb,
 976                                         struct qdisc_skb_head *qh)
 977 {
 978         skb->next = qh->head;
 979
 980         if (!qh->head)
 981                 qh->tail = skb;
 982         qh->head = skb;
 983         qh->qlen++;
 984 }
 985
 986 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
 987 {
 988         struct sk_buff *skb = qh->head;
 989
 990         if (likely(skb != NULL)) {
 991                 qh->head = skb->next;
 992                 qh->qlen--;
 993                 if (qh->head == NULL)
 994                         qh->tail = NULL;
 995                 skb->next = NULL;
 996         }
 997
 998         return skb;
 999 }
1000
1001 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
1002 {
1003         struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
1004
1005         if (likely(skb != NULL)) {
1006                 qdisc_qstats_backlog_dec(sch, skb);
1007                 qdisc_bstats_update(sch, skb);
1008         }
1009
1010         return skb;
1011 }
1012
1013 /* Instead of calling kfree_skb() while root qdisc lock is held,
1014  * queue the skb for future freeing at end of __dev_xmit_skb()
1015  */
1016 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
1017 {
1018         skb->next = *to_free;
1019         *to_free = skb;
1020 }
1021
1022 static inline void __qdisc_drop_all(struct sk_buff *skb,
1023                                     struct sk_buff **to_free)
1024 {
1025         if (skb->prev)
1026                 skb->prev->next = *to_free;
1027         else
1028                 skb->next = *to_free;
1029         *to_free = skb;
1030 }
1031
1032 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
1033                                                    struct qdisc_skb_head *qh,
1034                                                    struct sk_buff **to_free)
1035 {
1036         struct sk_buff *skb = __qdisc_dequeue_head(qh);
1037
1038         if (likely(skb != NULL)) {
1039                 unsigned int len = qdisc_pkt_len(skb);
1040
1041                 qdisc_qstats_backlog_dec(sch, skb);
1042                 __qdisc_drop(skb, to_free);
1043                 return len;
1044         }
1045
1046         return 0;
1047 }
1048
1049 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch,
1050                                                  struct sk_buff **to_free)
1051 {
1052         return __qdisc_queue_drop_head(sch, &sch->q, to_free);
1053 }
1054
1055 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
1056 {
1057         const struct qdisc_skb_head *qh = &sch->q;
1058
1059         return qh->head;
1060 }
1061
1062 /* generic pseudo peek method for non-work-conserving qdisc */
1063 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
1064 {
1065         struct sk_buff *skb = skb_peek(&sch->gso_skb);
1066
1067         /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
1068         if (!skb) {
1069                 skb = sch->dequeue(sch);
1070
1071                 if (skb) {
1072                         __skb_queue_head(&sch->gso_skb, skb);
1073                         /* it's still part of the queue */
1074                         qdisc_qstats_backlog_inc(sch, skb);
1075                         sch->q.qlen++;
1076                 }
1077         }
1078
1079         return skb;
1080 }
1081
1082 static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch,
1083                                                  struct sk_buff *skb)
1084 {
1085         if (qdisc_is_percpu_stats(sch)) {
1086                 qdisc_qstats_cpu_backlog_dec(sch, skb);
1087                 qdisc_bstats_cpu_update(sch, skb);
1088                 qdisc_qstats_cpu_qlen_dec(sch);
1089         } else {
1090                 qdisc_qstats_backlog_dec(sch, skb);
1091                 qdisc_bstats_update(sch, skb);
1092                 sch->q.qlen--;
1093         }
1094 }
1095
1096 static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch,
1097                                                  unsigned int pkt_len)
1098 {
1099         if (qdisc_is_percpu_stats(sch)) {
1100                 qdisc_qstats_cpu_qlen_inc(sch);
1101                 this_cpu_add(sch->cpu_qstats->backlog, pkt_len);
1102         } else {
1103                 sch->qstats.backlog += pkt_len;
1104                 sch->q.qlen++;
1105         }
1106 }
1107
1108 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
1109 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
1110 {
1111         struct sk_buff *skb = skb_peek(&sch->gso_skb);
1112
1113         if (skb) {
1114                 skb = __skb_dequeue(&sch->gso_skb);
1115                 if (qdisc_is_percpu_stats(sch)) {
1116                         qdisc_qstats_cpu_backlog_dec(sch, skb);
1117                         qdisc_qstats_cpu_qlen_dec(sch);
1118                 } else {
1119                         qdisc_qstats_backlog_dec(sch, skb);
1120                         sch->q.qlen--;
1121                 }
1122         } else {
1123                 skb = sch->dequeue(sch);
1124         }
1125
1126         return skb;
1127 }
1128
1129 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
1130 {
1131         /*
1132          * We do not know the backlog in bytes of this list, it
1133          * is up to the caller to correct it
1134          */
1135         ASSERT_RTNL();
1136         if (qh->qlen) {
1137                 rtnl_kfree_skbs(qh->head, qh->tail);
1138
1139                 qh->head = NULL;
1140                 qh->tail = NULL;
1141                 qh->qlen = 0;
1142         }
1143 }
1144
1145 static inline void qdisc_reset_queue(struct Qdisc *sch)
1146 {
1147         __qdisc_reset_queue(&sch->q);
1148         sch->qstats.backlog = 0;
1149 }
1150
1151 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
1152                                           struct Qdisc **pold)
1153 {
1154         struct Qdisc *old;
1155
1156         sch_tree_lock(sch);
1157         old = *pold;
1158         *pold = new;
1159         if (old != NULL)
1160                 qdisc_tree_flush_backlog(old);
1161         sch_tree_unlock(sch);
1162
1163         return old;
1164 }
1165
1166 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
1167 {
1168         rtnl_kfree_skbs(skb, skb);
1169         qdisc_qstats_drop(sch);
1170 }
1171
1172 static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch,
1173                                  struct sk_buff **to_free)
1174 {
1175         __qdisc_drop(skb, to_free);
1176         qdisc_qstats_cpu_drop(sch);
1177
1178         return NET_XMIT_DROP;
1179 }
1180
1181 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
1182                              struct sk_buff **to_free)
1183 {
1184         __qdisc_drop(skb, to_free);
1185         qdisc_qstats_drop(sch);
1186
1187         return NET_XMIT_DROP;
1188 }
1189
1190 static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch,
1191                                  struct sk_buff **to_free)
1192 {
1193         __qdisc_drop_all(skb, to_free);
1194         qdisc_qstats_drop(sch);
1195
1196         return NET_XMIT_DROP;
1197 }
1198
1199 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
1200    long it will take to send a packet given its size.
1201  */
1202 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
1203 {
1204         int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
1205         if (slot < 0)
1206                 slot = 0;
1207         slot >>= rtab->rate.cell_log;
1208         if (slot > 255)
1209                 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
1210         return rtab->data[slot];
1211 }
1212
1213 struct psched_ratecfg {
1214         u64     rate_bytes_ps; /* bytes per second */
1215         u32     mult;
1216         u16     overhead;
1217         u8      linklayer;
1218         u8      shift;
1219 };
1220
1221 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
1222                                 unsigned int len)
1223 {
1224         len += r->overhead;
1225
1226         if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
1227                 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
1228
1229         return ((u64)len * r->mult) >> r->shift;
1230 }
1231
1232 void psched_ratecfg_precompute(struct psched_ratecfg *r,
1233                                const struct tc_ratespec *conf,
1234                                u64 rate64);
1235
1236 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
1237                                           const struct psched_ratecfg *r)
1238 {
1239         memset(res, 0, sizeof(*res));
1240
1241         /* legacy struct tc_ratespec has a 32bit @rate field
1242          * Qdisc using 64bit rate should add new attributes
1243          * in order to maintain compatibility.
1244          */
1245         res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
1246
1247         res->overhead = r->overhead;
1248         res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
1249 }
1250
1251 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
1252  * The fast path only needs to access filter list and to update stats
1253  */
1254 struct mini_Qdisc {
1255         struct tcf_proto *filter_list;
1256         struct tcf_block *block;
1257         struct gnet_stats_basic_cpu __percpu *cpu_bstats;
1258         struct gnet_stats_queue __percpu *cpu_qstats;
1259         struct rcu_head rcu;
1260 };
1261
1262 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
1263                                                 const struct sk_buff *skb)
1264 {
1265         bstats_cpu_update(this_cpu_ptr(miniq->cpu_bstats), skb);
1266 }
1267
1268 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
1269 {
1270         this_cpu_inc(miniq->cpu_qstats->drops);
1271 }
1272
1273 struct mini_Qdisc_pair {
1274         struct mini_Qdisc miniq1;
1275         struct mini_Qdisc miniq2;
1276         struct mini_Qdisc __rcu **p_miniq;
1277 };
1278
1279 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
1280                           struct tcf_proto *tp_head);
1281 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
1282                           struct mini_Qdisc __rcu **p_miniq);
1283 void mini_qdisc_pair_block_init(struct mini_Qdisc_pair *miniqp,
1284                                 struct tcf_block *block);
1285
1286 static inline int skb_tc_reinsert(struct sk_buff *skb, struct tcf_result *res)
1287 {
1288         return res->ingress ? netif_receive_skb(skb) : dev_queue_xmit(skb);
1289 }
1290
1291 #endif