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 __QDISC_STATE_MISSED, 40 __QDISC_STATE_DRAINING, 41 }; 42 43 #define QDISC_STATE_MISSED BIT(__QDISC_STATE_MISSED) 44 #define QDISC_STATE_DRAINING BIT(__QDISC_STATE_DRAINING) 45 46 #define QDISC_STATE_NON_EMPTY (QDISC_STATE_MISSED | \ 47 QDISC_STATE_DRAINING) 48 49 struct qdisc_size_table { 50 struct rcu_head rcu; 51 struct list_head list; 52 struct tc_sizespec szopts; 53 int refcnt; 54 u16 data[]; 55 }; 56 57 /* similar to sk_buff_head, but skb->prev pointer is undefined. */ 58 struct qdisc_skb_head { 59 struct sk_buff *head; 60 struct sk_buff *tail; 61 __u32 qlen; 62 spinlock_t lock; 63 }; 64 65 struct Qdisc { 66 int (*enqueue)(struct sk_buff *skb, 67 struct Qdisc *sch, 68 struct sk_buff **to_free); 69 struct sk_buff * (*dequeue)(struct Qdisc *sch); 70 unsigned int flags; 71 #define TCQ_F_BUILTIN 1 72 #define TCQ_F_INGRESS 2 73 #define TCQ_F_CAN_BYPASS 4 74 #define TCQ_F_MQROOT 8 75 #define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for 76 * q->dev_queue : It can test 77 * netif_xmit_frozen_or_stopped() before 78 * dequeueing next packet. 79 * Its true for MQ/MQPRIO slaves, or non 80 * multiqueue device. 81 */ 82 #define TCQ_F_WARN_NONWC (1 << 16) 83 #define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */ 84 #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy : 85 * qdisc_tree_decrease_qlen() should stop. 86 */ 87 #define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */ 88 #define TCQ_F_NOLOCK 0x100 /* qdisc does not require locking */ 89 #define TCQ_F_OFFLOADED 0x200 /* qdisc is offloaded to HW */ 90 u32 limit; 91 const struct Qdisc_ops *ops; 92 struct qdisc_size_table __rcu *stab; 93 struct hlist_node hash; 94 u32 handle; 95 u32 parent; 96 97 struct netdev_queue *dev_queue; 98 99 struct net_rate_estimator __rcu *rate_est; 100 struct gnet_stats_basic_cpu __percpu *cpu_bstats; 101 struct gnet_stats_queue __percpu *cpu_qstats; 102 int pad; 103 refcount_t refcnt; 104 105 /* 106 * For performance sake on SMP, we put highly modified fields at the end 107 */ 108 struct sk_buff_head gso_skb ____cacheline_aligned_in_smp; 109 struct qdisc_skb_head q; 110 struct gnet_stats_basic_packed bstats; 111 seqcount_t running; 112 struct gnet_stats_queue qstats; 113 unsigned long state; 114 struct Qdisc *next_sched; 115 struct sk_buff_head skb_bad_txq; 116 117 spinlock_t busylock ____cacheline_aligned_in_smp; 118 spinlock_t seqlock; 119 120 struct rcu_head rcu; 121 122 /* private data */ 123 long privdata[] ____cacheline_aligned; 124 }; 125 126 static inline void qdisc_refcount_inc(struct Qdisc *qdisc) 127 { 128 if (qdisc->flags & TCQ_F_BUILTIN) 129 return; 130 refcount_inc(&qdisc->refcnt); 131 } 132 133 /* Intended to be used by unlocked users, when concurrent qdisc release is 134 * possible. 135 */ 136 137 static inline struct Qdisc *qdisc_refcount_inc_nz(struct Qdisc *qdisc) 138 { 139 if (qdisc->flags & TCQ_F_BUILTIN) 140 return qdisc; 141 if (refcount_inc_not_zero(&qdisc->refcnt)) 142 return qdisc; 143 return NULL; 144 } 145 146 static inline bool qdisc_is_running(struct Qdisc *qdisc) 147 { 148 if (qdisc->flags & TCQ_F_NOLOCK) 149 return spin_is_locked(&qdisc->seqlock); 150 return (raw_read_seqcount(&qdisc->running) & 1) ? true : false; 151 } 152 153 static inline bool nolock_qdisc_is_empty(const struct Qdisc *qdisc) 154 { 155 return !(READ_ONCE(qdisc->state) & QDISC_STATE_NON_EMPTY); 156 } 157 158 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q) 159 { 160 return q->flags & TCQ_F_CPUSTATS; 161 } 162 163 static inline bool qdisc_is_empty(const struct Qdisc *qdisc) 164 { 165 if (qdisc_is_percpu_stats(qdisc)) 166 return nolock_qdisc_is_empty(qdisc); 167 return !READ_ONCE(qdisc->q.qlen); 168 } 169 170 static inline bool qdisc_run_begin(struct Qdisc *qdisc) 171 { 172 if (qdisc->flags & TCQ_F_NOLOCK) { 173 if (spin_trylock(&qdisc->seqlock)) 174 return true; 175 176 /* Paired with smp_mb__after_atomic() to make sure 177 * STATE_MISSED checking is synchronized with clearing 178 * in pfifo_fast_dequeue(). 179 */ 180 smp_mb__before_atomic(); 181 182 /* If the MISSED flag is set, it means other thread has 183 * set the MISSED flag before second spin_trylock(), so 184 * we can return false here to avoid multi cpus doing 185 * the set_bit() and second spin_trylock() concurrently. 186 */ 187 if (test_bit(__QDISC_STATE_MISSED, &qdisc->state)) 188 return false; 189 190 /* Set the MISSED flag before the second spin_trylock(), 191 * if the second spin_trylock() return false, it means 192 * other cpu holding the lock will do dequeuing for us 193 * or it will see the MISSED flag set after releasing 194 * lock and reschedule the net_tx_action() to do the 195 * dequeuing. 196 */ 197 set_bit(__QDISC_STATE_MISSED, &qdisc->state); 198 199 /* spin_trylock() only has load-acquire semantic, so use 200 * smp_mb__after_atomic() to ensure STATE_MISSED is set 201 * before doing the second spin_trylock(). 202 */ 203 smp_mb__after_atomic(); 204 205 /* Retry again in case other CPU may not see the new flag 206 * after it releases the lock at the end of qdisc_run_end(). 207 */ 208 return spin_trylock(&qdisc->seqlock); 209 } else if (qdisc_is_running(qdisc)) { 210 return false; 211 } 212 /* Variant of write_seqcount_begin() telling lockdep a trylock 213 * was attempted. 214 */ 215 raw_write_seqcount_begin(&qdisc->running); 216 seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_); 217 return true; 218 } 219 220 static inline void qdisc_run_end(struct Qdisc *qdisc) 221 { 222 if (qdisc->flags & TCQ_F_NOLOCK) { 223 spin_unlock(&qdisc->seqlock); 224 225 if (unlikely(test_bit(__QDISC_STATE_MISSED, 226 &qdisc->state))) 227 __netif_schedule(qdisc); 228 } else { 229 write_seqcount_end(&qdisc->running); 230 } 231 } 232 233 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc) 234 { 235 return qdisc->flags & TCQ_F_ONETXQUEUE; 236 } 237 238 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq) 239 { 240 #ifdef CONFIG_BQL 241 /* Non-BQL migrated drivers will return 0, too. */ 242 return dql_avail(&txq->dql); 243 #else 244 return 0; 245 #endif 246 } 247 248 struct Qdisc_class_ops { 249 unsigned int flags; 250 /* Child qdisc manipulation */ 251 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *); 252 int (*graft)(struct Qdisc *, unsigned long cl, 253 struct Qdisc *, struct Qdisc **, 254 struct netlink_ext_ack *extack); 255 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl); 256 void (*qlen_notify)(struct Qdisc *, unsigned long); 257 258 /* Class manipulation routines */ 259 unsigned long (*find)(struct Qdisc *, u32 classid); 260 int (*change)(struct Qdisc *, u32, u32, 261 struct nlattr **, unsigned long *, 262 struct netlink_ext_ack *); 263 int (*delete)(struct Qdisc *, unsigned long, 264 struct netlink_ext_ack *); 265 void (*walk)(struct Qdisc *, struct qdisc_walker * arg); 266 267 /* Filter manipulation */ 268 struct tcf_block * (*tcf_block)(struct Qdisc *sch, 269 unsigned long arg, 270 struct netlink_ext_ack *extack); 271 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long, 272 u32 classid); 273 void (*unbind_tcf)(struct Qdisc *, unsigned long); 274 275 /* rtnetlink specific */ 276 int (*dump)(struct Qdisc *, unsigned long, 277 struct sk_buff *skb, struct tcmsg*); 278 int (*dump_stats)(struct Qdisc *, unsigned long, 279 struct gnet_dump *); 280 }; 281 282 /* Qdisc_class_ops flag values */ 283 284 /* Implements API that doesn't require rtnl lock */ 285 enum qdisc_class_ops_flags { 286 QDISC_CLASS_OPS_DOIT_UNLOCKED = 1, 287 }; 288 289 struct Qdisc_ops { 290 struct Qdisc_ops *next; 291 const struct Qdisc_class_ops *cl_ops; 292 char id[IFNAMSIZ]; 293 int priv_size; 294 unsigned int static_flags; 295 296 int (*enqueue)(struct sk_buff *skb, 297 struct Qdisc *sch, 298 struct sk_buff **to_free); 299 struct sk_buff * (*dequeue)(struct Qdisc *); 300 struct sk_buff * (*peek)(struct Qdisc *); 301 302 int (*init)(struct Qdisc *sch, struct nlattr *arg, 303 struct netlink_ext_ack *extack); 304 void (*reset)(struct Qdisc *); 305 void (*destroy)(struct Qdisc *); 306 int (*change)(struct Qdisc *sch, 307 struct nlattr *arg, 308 struct netlink_ext_ack *extack); 309 void (*attach)(struct Qdisc *sch); 310 int (*change_tx_queue_len)(struct Qdisc *, unsigned int); 311 void (*change_real_num_tx)(struct Qdisc *sch, 312 unsigned int new_real_tx); 313 314 int (*dump)(struct Qdisc *, struct sk_buff *); 315 int (*dump_stats)(struct Qdisc *, struct gnet_dump *); 316 317 void (*ingress_block_set)(struct Qdisc *sch, 318 u32 block_index); 319 void (*egress_block_set)(struct Qdisc *sch, 320 u32 block_index); 321 u32 (*ingress_block_get)(struct Qdisc *sch); 322 u32 (*egress_block_get)(struct Qdisc *sch); 323 324 struct module *owner; 325 }; 326 327 328 struct tcf_result { 329 union { 330 struct { 331 unsigned long class; 332 u32 classid; 333 }; 334 const struct tcf_proto *goto_tp; 335 336 /* used in the skb_tc_reinsert function */ 337 struct { 338 bool ingress; 339 struct gnet_stats_queue *qstats; 340 }; 341 }; 342 }; 343 344 struct tcf_chain; 345 346 struct tcf_proto_ops { 347 struct list_head head; 348 char kind[IFNAMSIZ]; 349 350 int (*classify)(struct sk_buff *, 351 const struct tcf_proto *, 352 struct tcf_result *); 353 int (*init)(struct tcf_proto*); 354 void (*destroy)(struct tcf_proto *tp, bool rtnl_held, 355 struct netlink_ext_ack *extack); 356 357 void* (*get)(struct tcf_proto*, u32 handle); 358 void (*put)(struct tcf_proto *tp, void *f); 359 int (*change)(struct net *net, struct sk_buff *, 360 struct tcf_proto*, unsigned long, 361 u32 handle, struct nlattr **, 362 void **, u32, 363 struct netlink_ext_ack *); 364 int (*delete)(struct tcf_proto *tp, void *arg, 365 bool *last, bool rtnl_held, 366 struct netlink_ext_ack *); 367 bool (*delete_empty)(struct tcf_proto *tp); 368 void (*walk)(struct tcf_proto *tp, 369 struct tcf_walker *arg, bool rtnl_held); 370 int (*reoffload)(struct tcf_proto *tp, bool add, 371 flow_setup_cb_t *cb, void *cb_priv, 372 struct netlink_ext_ack *extack); 373 void (*hw_add)(struct tcf_proto *tp, 374 void *type_data); 375 void (*hw_del)(struct tcf_proto *tp, 376 void *type_data); 377 void (*bind_class)(void *, u32, unsigned long, 378 void *, unsigned long); 379 void * (*tmplt_create)(struct net *net, 380 struct tcf_chain *chain, 381 struct nlattr **tca, 382 struct netlink_ext_ack *extack); 383 void (*tmplt_destroy)(void *tmplt_priv); 384 385 /* rtnetlink specific */ 386 int (*dump)(struct net*, struct tcf_proto*, void *, 387 struct sk_buff *skb, struct tcmsg*, 388 bool); 389 int (*terse_dump)(struct net *net, 390 struct tcf_proto *tp, void *fh, 391 struct sk_buff *skb, 392 struct tcmsg *t, bool rtnl_held); 393 int (*tmplt_dump)(struct sk_buff *skb, 394 struct net *net, 395 void *tmplt_priv); 396 397 struct module *owner; 398 int flags; 399 }; 400 401 /* Classifiers setting TCF_PROTO_OPS_DOIT_UNLOCKED in tcf_proto_ops->flags 402 * are expected to implement tcf_proto_ops->delete_empty(), otherwise race 403 * conditions can occur when filters are inserted/deleted simultaneously. 404 */ 405 enum tcf_proto_ops_flags { 406 TCF_PROTO_OPS_DOIT_UNLOCKED = 1, 407 }; 408 409 struct tcf_proto { 410 /* Fast access part */ 411 struct tcf_proto __rcu *next; 412 void __rcu *root; 413 414 /* called under RCU BH lock*/ 415 int (*classify)(struct sk_buff *, 416 const struct tcf_proto *, 417 struct tcf_result *); 418 __be16 protocol; 419 420 /* All the rest */ 421 u32 prio; 422 void *data; 423 const struct tcf_proto_ops *ops; 424 struct tcf_chain *chain; 425 /* Lock protects tcf_proto shared state and can be used by unlocked 426 * classifiers to protect their private data. 427 */ 428 spinlock_t lock; 429 bool deleting; 430 refcount_t refcnt; 431 struct rcu_head rcu; 432 struct hlist_node destroy_ht_node; 433 }; 434 435 struct qdisc_skb_cb { 436 struct { 437 unsigned int pkt_len; 438 u16 slave_dev_queue_mapping; 439 u16 tc_classid; 440 }; 441 #define QDISC_CB_PRIV_LEN 20 442 unsigned char data[QDISC_CB_PRIV_LEN]; 443 u16 mru; 444 bool post_ct; 445 }; 446 447 typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv); 448 449 struct tcf_chain { 450 /* Protects filter_chain. */ 451 struct mutex filter_chain_lock; 452 struct tcf_proto __rcu *filter_chain; 453 struct list_head list; 454 struct tcf_block *block; 455 u32 index; /* chain index */ 456 unsigned int refcnt; 457 unsigned int action_refcnt; 458 bool explicitly_created; 459 bool flushing; 460 const struct tcf_proto_ops *tmplt_ops; 461 void *tmplt_priv; 462 struct rcu_head rcu; 463 }; 464 465 struct tcf_block { 466 /* Lock protects tcf_block and lifetime-management data of chains 467 * attached to the block (refcnt, action_refcnt, explicitly_created). 468 */ 469 struct mutex lock; 470 struct list_head chain_list; 471 u32 index; /* block index for shared blocks */ 472 u32 classid; /* which class this block belongs to */ 473 refcount_t refcnt; 474 struct net *net; 475 struct Qdisc *q; 476 struct rw_semaphore cb_lock; /* protects cb_list and offload counters */ 477 struct flow_block flow_block; 478 struct list_head owner_list; 479 bool keep_dst; 480 atomic_t offloadcnt; /* Number of oddloaded filters */ 481 unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */ 482 unsigned int lockeddevcnt; /* Number of devs that require rtnl lock. */ 483 struct { 484 struct tcf_chain *chain; 485 struct list_head filter_chain_list; 486 } chain0; 487 struct rcu_head rcu; 488 DECLARE_HASHTABLE(proto_destroy_ht, 7); 489 struct mutex proto_destroy_lock; /* Lock for proto_destroy hashtable. */ 490 }; 491 492 static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain) 493 { 494 return lockdep_is_held(&chain->filter_chain_lock); 495 } 496 497 static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp) 498 { 499 return lockdep_is_held(&tp->lock); 500 } 501 502 #define tcf_chain_dereference(p, chain) \ 503 rcu_dereference_protected(p, lockdep_tcf_chain_is_locked(chain)) 504 505 #define tcf_proto_dereference(p, tp) \ 506 rcu_dereference_protected(p, lockdep_tcf_proto_is_locked(tp)) 507 508 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz) 509 { 510 struct qdisc_skb_cb *qcb; 511 512 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(*qcb)); 513 BUILD_BUG_ON(sizeof(qcb->data) < sz); 514 } 515 516 static inline int qdisc_qlen_cpu(const struct Qdisc *q) 517 { 518 return this_cpu_ptr(q->cpu_qstats)->qlen; 519 } 520 521 static inline int qdisc_qlen(const struct Qdisc *q) 522 { 523 return q->q.qlen; 524 } 525 526 static inline int qdisc_qlen_sum(const struct Qdisc *q) 527 { 528 __u32 qlen = q->qstats.qlen; 529 int i; 530 531 if (qdisc_is_percpu_stats(q)) { 532 for_each_possible_cpu(i) 533 qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen; 534 } else { 535 qlen += q->q.qlen; 536 } 537 538 return qlen; 539 } 540 541 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb) 542 { 543 return (struct qdisc_skb_cb *)skb->cb; 544 } 545 546 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc) 547 { 548 return &qdisc->q.lock; 549 } 550 551 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc) 552 { 553 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc); 554 555 return q; 556 } 557 558 static inline struct Qdisc *qdisc_root_bh(const struct Qdisc *qdisc) 559 { 560 return rcu_dereference_bh(qdisc->dev_queue->qdisc); 561 } 562 563 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc) 564 { 565 return qdisc->dev_queue->qdisc_sleeping; 566 } 567 568 /* The qdisc root lock is a mechanism by which to top level 569 * of a qdisc tree can be locked from any qdisc node in the 570 * forest. This allows changing the configuration of some 571 * aspect of the qdisc tree while blocking out asynchronous 572 * qdisc access in the packet processing paths. 573 * 574 * It is only legal to do this when the root will not change 575 * on us. Otherwise we'll potentially lock the wrong qdisc 576 * root. This is enforced by holding the RTNL semaphore, which 577 * all users of this lock accessor must do. 578 */ 579 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc) 580 { 581 struct Qdisc *root = qdisc_root(qdisc); 582 583 ASSERT_RTNL(); 584 return qdisc_lock(root); 585 } 586 587 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc) 588 { 589 struct Qdisc *root = qdisc_root_sleeping(qdisc); 590 591 ASSERT_RTNL(); 592 return qdisc_lock(root); 593 } 594 595 static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc) 596 { 597 struct Qdisc *root = qdisc_root_sleeping(qdisc); 598 599 ASSERT_RTNL(); 600 return &root->running; 601 } 602 603 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc) 604 { 605 return qdisc->dev_queue->dev; 606 } 607 608 static inline void sch_tree_lock(struct Qdisc *q) 609 { 610 if (q->flags & TCQ_F_MQROOT) 611 spin_lock_bh(qdisc_lock(q)); 612 else 613 spin_lock_bh(qdisc_root_sleeping_lock(q)); 614 } 615 616 static inline void sch_tree_unlock(struct Qdisc *q) 617 { 618 if (q->flags & TCQ_F_MQROOT) 619 spin_unlock_bh(qdisc_lock(q)); 620 else 621 spin_unlock_bh(qdisc_root_sleeping_lock(q)); 622 } 623 624 extern struct Qdisc noop_qdisc; 625 extern struct Qdisc_ops noop_qdisc_ops; 626 extern struct Qdisc_ops pfifo_fast_ops; 627 extern struct Qdisc_ops mq_qdisc_ops; 628 extern struct Qdisc_ops noqueue_qdisc_ops; 629 extern const struct Qdisc_ops *default_qdisc_ops; 630 static inline const struct Qdisc_ops * 631 get_default_qdisc_ops(const struct net_device *dev, int ntx) 632 { 633 return ntx < dev->real_num_tx_queues ? 634 default_qdisc_ops : &pfifo_fast_ops; 635 } 636 637 struct Qdisc_class_common { 638 u32 classid; 639 struct hlist_node hnode; 640 }; 641 642 struct Qdisc_class_hash { 643 struct hlist_head *hash; 644 unsigned int hashsize; 645 unsigned int hashmask; 646 unsigned int hashelems; 647 }; 648 649 static inline unsigned int qdisc_class_hash(u32 id, u32 mask) 650 { 651 id ^= id >> 8; 652 id ^= id >> 4; 653 return id & mask; 654 } 655 656 static inline struct Qdisc_class_common * 657 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id) 658 { 659 struct Qdisc_class_common *cl; 660 unsigned int h; 661 662 if (!id) 663 return NULL; 664 665 h = qdisc_class_hash(id, hash->hashmask); 666 hlist_for_each_entry(cl, &hash->hash[h], hnode) { 667 if (cl->classid == id) 668 return cl; 669 } 670 return NULL; 671 } 672 673 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid) 674 { 675 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY; 676 677 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL; 678 } 679 680 int qdisc_class_hash_init(struct Qdisc_class_hash *); 681 void qdisc_class_hash_insert(struct Qdisc_class_hash *, 682 struct Qdisc_class_common *); 683 void qdisc_class_hash_remove(struct Qdisc_class_hash *, 684 struct Qdisc_class_common *); 685 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *); 686 void qdisc_class_hash_destroy(struct Qdisc_class_hash *); 687 688 int dev_qdisc_change_tx_queue_len(struct net_device *dev); 689 void dev_qdisc_change_real_num_tx(struct net_device *dev, 690 unsigned int new_real_tx); 691 void dev_init_scheduler(struct net_device *dev); 692 void dev_shutdown(struct net_device *dev); 693 void dev_activate(struct net_device *dev); 694 void dev_deactivate(struct net_device *dev); 695 void dev_deactivate_many(struct list_head *head); 696 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, 697 struct Qdisc *qdisc); 698 void qdisc_reset(struct Qdisc *qdisc); 699 void qdisc_put(struct Qdisc *qdisc); 700 void qdisc_put_unlocked(struct Qdisc *qdisc); 701 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len); 702 #ifdef CONFIG_NET_SCHED 703 int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type, 704 void *type_data); 705 void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch, 706 struct Qdisc *new, struct Qdisc *old, 707 enum tc_setup_type type, void *type_data, 708 struct netlink_ext_ack *extack); 709 #else 710 static inline int 711 qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type, 712 void *type_data) 713 { 714 q->flags &= ~TCQ_F_OFFLOADED; 715 return 0; 716 } 717 718 static inline void 719 qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch, 720 struct Qdisc *new, struct Qdisc *old, 721 enum tc_setup_type type, void *type_data, 722 struct netlink_ext_ack *extack) 723 { 724 } 725 #endif 726 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, 727 const struct Qdisc_ops *ops, 728 struct netlink_ext_ack *extack); 729 void qdisc_free(struct Qdisc *qdisc); 730 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, 731 const struct Qdisc_ops *ops, u32 parentid, 732 struct netlink_ext_ack *extack); 733 void __qdisc_calculate_pkt_len(struct sk_buff *skb, 734 const struct qdisc_size_table *stab); 735 int skb_do_redirect(struct sk_buff *); 736 737 static inline bool skb_at_tc_ingress(const struct sk_buff *skb) 738 { 739 #ifdef CONFIG_NET_CLS_ACT 740 return skb->tc_at_ingress; 741 #else 742 return false; 743 #endif 744 } 745 746 static inline bool skb_skip_tc_classify(struct sk_buff *skb) 747 { 748 #ifdef CONFIG_NET_CLS_ACT 749 if (skb->tc_skip_classify) { 750 skb->tc_skip_classify = 0; 751 return true; 752 } 753 #endif 754 return false; 755 } 756 757 /* Reset all TX qdiscs greater than index of a device. */ 758 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i) 759 { 760 struct Qdisc *qdisc; 761 762 for (; i < dev->num_tx_queues; i++) { 763 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc); 764 if (qdisc) { 765 spin_lock_bh(qdisc_lock(qdisc)); 766 qdisc_reset(qdisc); 767 spin_unlock_bh(qdisc_lock(qdisc)); 768 } 769 } 770 } 771 772 /* Are all TX queues of the device empty? */ 773 static inline bool qdisc_all_tx_empty(const struct net_device *dev) 774 { 775 unsigned int i; 776 777 rcu_read_lock(); 778 for (i = 0; i < dev->num_tx_queues; i++) { 779 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 780 const struct Qdisc *q = rcu_dereference(txq->qdisc); 781 782 if (!qdisc_is_empty(q)) { 783 rcu_read_unlock(); 784 return false; 785 } 786 } 787 rcu_read_unlock(); 788 return true; 789 } 790 791 /* Are any of the TX qdiscs changing? */ 792 static inline bool qdisc_tx_changing(const struct net_device *dev) 793 { 794 unsigned int i; 795 796 for (i = 0; i < dev->num_tx_queues; i++) { 797 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 798 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping) 799 return true; 800 } 801 return false; 802 } 803 804 /* Is the device using the noop qdisc on all queues? */ 805 static inline bool qdisc_tx_is_noop(const struct net_device *dev) 806 { 807 unsigned int i; 808 809 for (i = 0; i < dev->num_tx_queues; i++) { 810 struct netdev_queue *txq = netdev_get_tx_queue(dev, i); 811 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc) 812 return false; 813 } 814 return true; 815 } 816 817 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb) 818 { 819 return qdisc_skb_cb(skb)->pkt_len; 820 } 821 822 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */ 823 enum net_xmit_qdisc_t { 824 __NET_XMIT_STOLEN = 0x00010000, 825 __NET_XMIT_BYPASS = 0x00020000, 826 }; 827 828 #ifdef CONFIG_NET_CLS_ACT 829 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1) 830 #else 831 #define net_xmit_drop_count(e) (1) 832 #endif 833 834 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb, 835 const struct Qdisc *sch) 836 { 837 #ifdef CONFIG_NET_SCHED 838 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab); 839 840 if (stab) 841 __qdisc_calculate_pkt_len(skb, stab); 842 #endif 843 } 844 845 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch, 846 struct sk_buff **to_free) 847 { 848 qdisc_calculate_pkt_len(skb, sch); 849 return sch->enqueue(skb, sch, to_free); 850 } 851 852 static inline void _bstats_update(struct gnet_stats_basic_packed *bstats, 853 __u64 bytes, __u32 packets) 854 { 855 bstats->bytes += bytes; 856 bstats->packets += packets; 857 } 858 859 static inline void bstats_update(struct gnet_stats_basic_packed *bstats, 860 const struct sk_buff *skb) 861 { 862 _bstats_update(bstats, 863 qdisc_pkt_len(skb), 864 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1); 865 } 866 867 static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats, 868 __u64 bytes, __u32 packets) 869 { 870 u64_stats_update_begin(&bstats->syncp); 871 _bstats_update(&bstats->bstats, bytes, packets); 872 u64_stats_update_end(&bstats->syncp); 873 } 874 875 static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats, 876 const struct sk_buff *skb) 877 { 878 u64_stats_update_begin(&bstats->syncp); 879 bstats_update(&bstats->bstats, skb); 880 u64_stats_update_end(&bstats->syncp); 881 } 882 883 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch, 884 const struct sk_buff *skb) 885 { 886 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb); 887 } 888 889 static inline void qdisc_bstats_update(struct Qdisc *sch, 890 const struct sk_buff *skb) 891 { 892 bstats_update(&sch->bstats, skb); 893 } 894 895 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch, 896 const struct sk_buff *skb) 897 { 898 sch->qstats.backlog -= qdisc_pkt_len(skb); 899 } 900 901 static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch, 902 const struct sk_buff *skb) 903 { 904 this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb)); 905 } 906 907 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch, 908 const struct sk_buff *skb) 909 { 910 sch->qstats.backlog += qdisc_pkt_len(skb); 911 } 912 913 static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch, 914 const struct sk_buff *skb) 915 { 916 this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb)); 917 } 918 919 static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch) 920 { 921 this_cpu_inc(sch->cpu_qstats->qlen); 922 } 923 924 static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch) 925 { 926 this_cpu_dec(sch->cpu_qstats->qlen); 927 } 928 929 static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch) 930 { 931 this_cpu_inc(sch->cpu_qstats->requeues); 932 } 933 934 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count) 935 { 936 sch->qstats.drops += count; 937 } 938 939 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats) 940 { 941 qstats->drops++; 942 } 943 944 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats) 945 { 946 qstats->overlimits++; 947 } 948 949 static inline void qdisc_qstats_drop(struct Qdisc *sch) 950 { 951 qstats_drop_inc(&sch->qstats); 952 } 953 954 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch) 955 { 956 this_cpu_inc(sch->cpu_qstats->drops); 957 } 958 959 static inline void qdisc_qstats_overlimit(struct Qdisc *sch) 960 { 961 sch->qstats.overlimits++; 962 } 963 964 static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch) 965 { 966 __u32 qlen = qdisc_qlen_sum(sch); 967 968 return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen); 969 } 970 971 static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch, __u32 *qlen, 972 __u32 *backlog) 973 { 974 struct gnet_stats_queue qstats = { 0 }; 975 __u32 len = qdisc_qlen_sum(sch); 976 977 __gnet_stats_copy_queue(&qstats, sch->cpu_qstats, &sch->qstats, len); 978 *qlen = qstats.qlen; 979 *backlog = qstats.backlog; 980 } 981 982 static inline void qdisc_tree_flush_backlog(struct Qdisc *sch) 983 { 984 __u32 qlen, backlog; 985 986 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog); 987 qdisc_tree_reduce_backlog(sch, qlen, backlog); 988 } 989 990 static inline void qdisc_purge_queue(struct Qdisc *sch) 991 { 992 __u32 qlen, backlog; 993 994 qdisc_qstats_qlen_backlog(sch, &qlen, &backlog); 995 qdisc_reset(sch); 996 qdisc_tree_reduce_backlog(sch, qlen, backlog); 997 } 998 999 static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh) 1000 { 1001 qh->head = NULL; 1002 qh->tail = NULL; 1003 qh->qlen = 0; 1004 } 1005 1006 static inline void __qdisc_enqueue_tail(struct sk_buff *skb, 1007 struct qdisc_skb_head *qh) 1008 { 1009 struct sk_buff *last = qh->tail; 1010 1011 if (last) { 1012 skb->next = NULL; 1013 last->next = skb; 1014 qh->tail = skb; 1015 } else { 1016 qh->tail = skb; 1017 qh->head = skb; 1018 } 1019 qh->qlen++; 1020 } 1021 1022 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch) 1023 { 1024 __qdisc_enqueue_tail(skb, &sch->q); 1025 qdisc_qstats_backlog_inc(sch, skb); 1026 return NET_XMIT_SUCCESS; 1027 } 1028 1029 static inline void __qdisc_enqueue_head(struct sk_buff *skb, 1030 struct qdisc_skb_head *qh) 1031 { 1032 skb->next = qh->head; 1033 1034 if (!qh->head) 1035 qh->tail = skb; 1036 qh->head = skb; 1037 qh->qlen++; 1038 } 1039 1040 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh) 1041 { 1042 struct sk_buff *skb = qh->head; 1043 1044 if (likely(skb != NULL)) { 1045 qh->head = skb->next; 1046 qh->qlen--; 1047 if (qh->head == NULL) 1048 qh->tail = NULL; 1049 skb->next = NULL; 1050 } 1051 1052 return skb; 1053 } 1054 1055 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch) 1056 { 1057 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q); 1058 1059 if (likely(skb != NULL)) { 1060 qdisc_qstats_backlog_dec(sch, skb); 1061 qdisc_bstats_update(sch, skb); 1062 } 1063 1064 return skb; 1065 } 1066 1067 /* Instead of calling kfree_skb() while root qdisc lock is held, 1068 * queue the skb for future freeing at end of __dev_xmit_skb() 1069 */ 1070 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free) 1071 { 1072 skb->next = *to_free; 1073 *to_free = skb; 1074 } 1075 1076 static inline void __qdisc_drop_all(struct sk_buff *skb, 1077 struct sk_buff **to_free) 1078 { 1079 if (skb->prev) 1080 skb->prev->next = *to_free; 1081 else 1082 skb->next = *to_free; 1083 *to_free = skb; 1084 } 1085 1086 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch, 1087 struct qdisc_skb_head *qh, 1088 struct sk_buff **to_free) 1089 { 1090 struct sk_buff *skb = __qdisc_dequeue_head(qh); 1091 1092 if (likely(skb != NULL)) { 1093 unsigned int len = qdisc_pkt_len(skb); 1094 1095 qdisc_qstats_backlog_dec(sch, skb); 1096 __qdisc_drop(skb, to_free); 1097 return len; 1098 } 1099 1100 return 0; 1101 } 1102 1103 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch) 1104 { 1105 const struct qdisc_skb_head *qh = &sch->q; 1106 1107 return qh->head; 1108 } 1109 1110 /* generic pseudo peek method for non-work-conserving qdisc */ 1111 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch) 1112 { 1113 struct sk_buff *skb = skb_peek(&sch->gso_skb); 1114 1115 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */ 1116 if (!skb) { 1117 skb = sch->dequeue(sch); 1118 1119 if (skb) { 1120 __skb_queue_head(&sch->gso_skb, skb); 1121 /* it's still part of the queue */ 1122 qdisc_qstats_backlog_inc(sch, skb); 1123 sch->q.qlen++; 1124 } 1125 } 1126 1127 return skb; 1128 } 1129 1130 static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch, 1131 struct sk_buff *skb) 1132 { 1133 if (qdisc_is_percpu_stats(sch)) { 1134 qdisc_qstats_cpu_backlog_dec(sch, skb); 1135 qdisc_bstats_cpu_update(sch, skb); 1136 qdisc_qstats_cpu_qlen_dec(sch); 1137 } else { 1138 qdisc_qstats_backlog_dec(sch, skb); 1139 qdisc_bstats_update(sch, skb); 1140 sch->q.qlen--; 1141 } 1142 } 1143 1144 static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch, 1145 unsigned int pkt_len) 1146 { 1147 if (qdisc_is_percpu_stats(sch)) { 1148 qdisc_qstats_cpu_qlen_inc(sch); 1149 this_cpu_add(sch->cpu_qstats->backlog, pkt_len); 1150 } else { 1151 sch->qstats.backlog += pkt_len; 1152 sch->q.qlen++; 1153 } 1154 } 1155 1156 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */ 1157 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch) 1158 { 1159 struct sk_buff *skb = skb_peek(&sch->gso_skb); 1160 1161 if (skb) { 1162 skb = __skb_dequeue(&sch->gso_skb); 1163 if (qdisc_is_percpu_stats(sch)) { 1164 qdisc_qstats_cpu_backlog_dec(sch, skb); 1165 qdisc_qstats_cpu_qlen_dec(sch); 1166 } else { 1167 qdisc_qstats_backlog_dec(sch, skb); 1168 sch->q.qlen--; 1169 } 1170 } else { 1171 skb = sch->dequeue(sch); 1172 } 1173 1174 return skb; 1175 } 1176 1177 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh) 1178 { 1179 /* 1180 * We do not know the backlog in bytes of this list, it 1181 * is up to the caller to correct it 1182 */ 1183 ASSERT_RTNL(); 1184 if (qh->qlen) { 1185 rtnl_kfree_skbs(qh->head, qh->tail); 1186 1187 qh->head = NULL; 1188 qh->tail = NULL; 1189 qh->qlen = 0; 1190 } 1191 } 1192 1193 static inline void qdisc_reset_queue(struct Qdisc *sch) 1194 { 1195 __qdisc_reset_queue(&sch->q); 1196 sch->qstats.backlog = 0; 1197 } 1198 1199 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new, 1200 struct Qdisc **pold) 1201 { 1202 struct Qdisc *old; 1203 1204 sch_tree_lock(sch); 1205 old = *pold; 1206 *pold = new; 1207 if (old != NULL) 1208 qdisc_purge_queue(old); 1209 sch_tree_unlock(sch); 1210 1211 return old; 1212 } 1213 1214 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch) 1215 { 1216 rtnl_kfree_skbs(skb, skb); 1217 qdisc_qstats_drop(sch); 1218 } 1219 1220 static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch, 1221 struct sk_buff **to_free) 1222 { 1223 __qdisc_drop(skb, to_free); 1224 qdisc_qstats_cpu_drop(sch); 1225 1226 return NET_XMIT_DROP; 1227 } 1228 1229 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch, 1230 struct sk_buff **to_free) 1231 { 1232 __qdisc_drop(skb, to_free); 1233 qdisc_qstats_drop(sch); 1234 1235 return NET_XMIT_DROP; 1236 } 1237 1238 static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch, 1239 struct sk_buff **to_free) 1240 { 1241 __qdisc_drop_all(skb, to_free); 1242 qdisc_qstats_drop(sch); 1243 1244 return NET_XMIT_DROP; 1245 } 1246 1247 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how 1248 long it will take to send a packet given its size. 1249 */ 1250 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen) 1251 { 1252 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead; 1253 if (slot < 0) 1254 slot = 0; 1255 slot >>= rtab->rate.cell_log; 1256 if (slot > 255) 1257 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]; 1258 return rtab->data[slot]; 1259 } 1260 1261 struct psched_ratecfg { 1262 u64 rate_bytes_ps; /* bytes per second */ 1263 u32 mult; 1264 u16 overhead; 1265 u8 linklayer; 1266 u8 shift; 1267 }; 1268 1269 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r, 1270 unsigned int len) 1271 { 1272 len += r->overhead; 1273 1274 if (unlikely(r->linklayer == TC_LINKLAYER_ATM)) 1275 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift; 1276 1277 return ((u64)len * r->mult) >> r->shift; 1278 } 1279 1280 void psched_ratecfg_precompute(struct psched_ratecfg *r, 1281 const struct tc_ratespec *conf, 1282 u64 rate64); 1283 1284 static inline void psched_ratecfg_getrate(struct tc_ratespec *res, 1285 const struct psched_ratecfg *r) 1286 { 1287 memset(res, 0, sizeof(*res)); 1288 1289 /* legacy struct tc_ratespec has a 32bit @rate field 1290 * Qdisc using 64bit rate should add new attributes 1291 * in order to maintain compatibility. 1292 */ 1293 res->rate = min_t(u64, r->rate_bytes_ps, ~0U); 1294 1295 res->overhead = r->overhead; 1296 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK); 1297 } 1298 1299 struct psched_pktrate { 1300 u64 rate_pkts_ps; /* packets per second */ 1301 u32 mult; 1302 u8 shift; 1303 }; 1304 1305 static inline u64 psched_pkt2t_ns(const struct psched_pktrate *r, 1306 unsigned int pkt_num) 1307 { 1308 return ((u64)pkt_num * r->mult) >> r->shift; 1309 } 1310 1311 void psched_ppscfg_precompute(struct psched_pktrate *r, u64 pktrate64); 1312 1313 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc. 1314 * The fast path only needs to access filter list and to update stats 1315 */ 1316 struct mini_Qdisc { 1317 struct tcf_proto *filter_list; 1318 struct tcf_block *block; 1319 struct gnet_stats_basic_cpu __percpu *cpu_bstats; 1320 struct gnet_stats_queue __percpu *cpu_qstats; 1321 struct rcu_head rcu; 1322 }; 1323 1324 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq, 1325 const struct sk_buff *skb) 1326 { 1327 bstats_cpu_update(this_cpu_ptr(miniq->cpu_bstats), skb); 1328 } 1329 1330 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq) 1331 { 1332 this_cpu_inc(miniq->cpu_qstats->drops); 1333 } 1334 1335 struct mini_Qdisc_pair { 1336 struct mini_Qdisc miniq1; 1337 struct mini_Qdisc miniq2; 1338 struct mini_Qdisc __rcu **p_miniq; 1339 }; 1340 1341 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp, 1342 struct tcf_proto *tp_head); 1343 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc, 1344 struct mini_Qdisc __rcu **p_miniq); 1345 void mini_qdisc_pair_block_init(struct mini_Qdisc_pair *miniqp, 1346 struct tcf_block *block); 1347 1348 void mq_change_real_num_tx(struct Qdisc *sch, unsigned int new_real_tx); 1349 1350 int sch_frag_xmit_hook(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb)); 1351 1352 #endif 1353